TWI496281B - Pixel structure of electroluminescent display - Google Patents

Description

Pixel structure of electroluminescent display panel

The invention relates to a pixel structure of an electroluminescent display panel, in particular to a pixel structure of an electroluminescent display panel which can avoid the color mixing problem of adjacent sub-pixel regions and has high brightness and low power consumption.

Electroluminescent display panels (such as organic light-emitting diode display panels) are expected to become mainstream products of a new generation of flat display panels due to their advantages of active illumination, high contrast, thin thickness and wide viewing angle. The conventional electroluminescent display panel mainly uses white light organic light emitting layer to generate white light, and then uses color filter to form three different primary color lights such as red light, green light and blue light, thereby displaying a full color display screen. .

However, since the conventional electroluminescent display panel uses a color filter to filter white light into three different primary colors, two-thirds of the white light is consumed when passing through the color filter, and the brightness is greatly reduced. In order to compensate for the lack of brightness, it is necessary to drive the electroluminescent element with a higher voltage, which in turn causes a large increase in power consumption of the electroluminescent display panel and affects power consumption.

One of the objects of the present invention is to provide a pixel structure of an electroluminescent display panel to improve brightness, reduce power consumption, and avoid color mixing problems between adjacent sub-pixel regions.

Embodiments of the present invention provide a pixel structure of an electroluminescence display panel having a first pixel region, a second pixel region, and a third pixel region. The pixel structure of the electroluminescent display panel includes a substrate, a first anode, a first cathode, a second anode, a second cathode, a third anode, a third cathode, a first organic light emitting layer, a second organic light emitting layer, and a first A color filter pattern. The first anode and the first cathode are disposed on the substrate and located in the first pixel region. The second anode and the second cathode are disposed on the substrate and located in the second pixel region. The third anode and the third cathode are disposed on the substrate and located in the third pixel region. The first organic light-emitting layer is disposed in the first pixel region and the second pixel region, and is located between the first anode and the first cathode and between the second anode and the second cathode. The first organic light emitting layer includes a first organic light emitting material for emitting first primary color light, and the second organic light emitting material is for emitting second primary color light. The second organic light-emitting layer is disposed in the first pixel region, the second pixel region and the third pixel region, and is located between the first anode and the first cathode, and the second anode and the second cathode And between the third anode and the third cathode. The second organic light emitting layer includes a third organic light emitting material for emitting light of a third primary color. The first color filter pattern is disposed in the first pixel region to allow the first primary color light to pass. In the first pixel region, a first microcavity is formed between the first anode and the first cathode, and a second cavity is formed between the second anode and the second cathode in the second pixel region. The second micro-resonator has a different cavity length and a second micro-resonator, and no color filter pattern is disposed in the third pixel region.

The pixel structure of the electroluminescent display panel of the present invention is set only in a part of the sub-pixel area The color filter can avoid the color mixing problem between adjacent sub-pixel regions, and can effectively increase the display brightness and reduce the power consumption.

The present invention will be further understood by those of ordinary skill in the art to which the present invention pertains. .

Please refer to Figure 1. FIG. 1 is a schematic view showing a pixel structure of an electroluminescence display panel according to a first embodiment of the present invention. As shown in FIG. 1, the pixel structure 10 of the electroluminescent display panel of the present embodiment has at least a first pixel region 101, a second pixel region 102, and a third pixel region 103, or only The first pixel area 101, the second pixel area 102, and the third pixel area 103 are formed. The first pixel region 101, the second pixel region 102, and the third pixel region 103 are respectively used to display light of different colors, and they may be arranged in a side by side manner, that is, first. The sub-pixel area 101 is disposed adjacent to the second pixel area 102, and the second pixel area 102 is disposed adjacent to the third pixel area 103, but is not limited thereto.

The pixel structure 10 of the electroluminescence display panel includes a substrate 1, a first anode 121, a second anode 122, a third anode 123, a first cathode 141, a second cathode 142, and a third cathode 143. The substrate 1 can be a transparent substrate, such as a glass substrate or a plastic substrate, but is not limited thereto. The first anode 121 and the first cathode 141 are disposed on the substrate 1 and are located in the first pixel region 101. The first cathode 141 is located above the first anode 121, and In the first pixel region 101, a first micro cavity 161 is formed between the first anode 121 and the first cathode 141. The second anode 122 and the second cathode 142 are disposed on the substrate 1 and located in the second pixel region 102. The second cathode 142 is located above the second anode 122, and in the second pixel region 102, a second microresonator cavity 162 is formed between the second anode 122 and the second cathode 142. The third anode 123 and the third cathode 143 are disposed on the substrate 1 and located in the third pixel region 103. The third cathode 143 is located above the third anode 123, and a third microresonator 163 is formed between the third anode 123 and the third cathode 143. The first microresonator cavity 161, the second microresonator cavity 162, and the third microresonator cavity 163 have different cavity lengths. The electroluminescent display panel of the present embodiment may be, for example, an organic light emitting diode (OLED) display panel, and the electroluminescent display panel may be a top emission type electroluminescent display panel, wherein the first cathode 141 The second cathode 142 and the third cathode 143 are respectively transflective electrodes, and the first anode 121, the second anode 122 and the third anode 123 are respectively reflective electrodes. The transflective electrode may be, for example, a thin metal electrode, and the reflective electrode may be, for example, a thick metal electrode, but is not limited thereto. In addition, the first cathode 141, the second cathode 142, and the third cathode 143 may be electrically connected to each other and applied with a common voltage to be driven, or electrically separated from each other and driven by different voltages. The first anode 121, the second anode 122, and the third anode 123 can be driven by different driving elements (not shown) such as thin film transistor elements, respectively. In addition, the pixel structure 10 of the electroluminescent display panel may further include at least one first transparent electrode layer 221, at least one second transparent electrode layer 222 and at least one third transparent electrode layer 223, respectively disposed at the first The sub-pixel area 101, the second pixel area 102, and the third pixel area 103 are included. In this embodiment, the first transparent electrode layer 221, the second transparent electrode layer 222, and the third transparent electrode layer 223 have substantially Equal thickness, but not limited to this.

The pixel structure 10 of the electroluminescent display panel of the present embodiment further includes a first organic light emitting layer 181 and a second organic light emitting layer 182. The first organic light emitting layer 181 is disposed in the first pixel region 101 and the second pixel region 102. The first organic light-emitting layer 181 is located between the first anode 121 and the first cathode 141 and between the second anode 122 and the second cathode 142, and the first organic light-emitting layer 181 includes a first organic light-emitting material 181A for emitting The first primary color light L1 and the second organic light-emitting material 181B are used to emit the second primary color light L2. The second organic light-emitting layer 182 is disposed in the first-order pixel region 101, the second-order pixel region 102, and the third-order pixel region 103. The second organic light-emitting layer 182 is located between the first anode 121 and the first cathode 141, between the second anode 122 and the second cathode 142, and between the third anode 123 and the third cathode 143, and the second organic light-emitting layer 182 includes a third organic light emitting material 182A for emitting third primary color light L3. The first primary color light L1, the second primary color light L2 and the third primary color light L3 have different wavelength spectra, and the wavelength of the first primary color light L1 is greater than the wavelength of the second primary color light L2, and the wavelength of the second primary color light L2 is greater than the third primary color. The wavelength of light L3. For example, the first primary color light L1, the second primary color light L2, and the third primary color light L3 are red light, green light, and blue light, respectively. The first organic light-emitting material 181A includes a red light organic light-emitting material, the second organic light-emitting material 181B includes a green light-emitting material, and the third organic light-emitting material 182A includes a blue organic light-emitting material, but is not limited thereto.

The first organic light-emitting layer 181 and the second organic light-emitting layer 182 overlap in the first pixel region 101 and the second pixel region 102, for example, in the embodiment, the second organic light-emitting layer The 182 series is stacked on the first organic light-emitting layer 181, but is not limited thereto. In a variant embodiment, the second organic light-emitting layer 182 may also be stacked on the first organic light-emitting layer 181. In the present embodiment, the first organic light-emitting layer 181 and the second organic light-emitting layer 182 can be formed by, for example, an evaporation process. Since the first organic light-emitting layer 181 is a continuous structural layer and is continuously distributed in the first pixel region 101 and the second pixel region 102, the first organic light-emitting material 181A of the first organic light-emitting layer 181 is The second organic light-emitting material 181B can be formed using the same fine metal mask (FMM). The first organic light-emitting layer 181 may have a multi-layer structure. In this case, the first organic light-emitting material 181A and the second organic light-emitting material 181B may be formed by using two vapor deposition processes, respectively. Alternatively, the first organic light-emitting material 181A and the second organic light-emitting material 181B may have a single-layer structure. In this case, the first organic light-emitting material 181A and the second organic light-emitting material 181B may be formed by a co-evaporation process. In addition, since the second organic light-emitting layer 182 is a continuous structural layer, it is continuously distributed in the first-order pixel region 101, the second-order pixel region 102, and the third-order pixel region 103, and thus the third organic light-emitting material 182A It can be formed by a vapor deposition process using a common mask without using a fine metal mask. The method of the above-mentioned common mask means that the first pixel area 101, the second pixel area 102 and the third pixel area 103 can share the same mask, and there is no need to open the steam for each of the other pixel regions. Plating can reduce the precision of the mask production, and there is no need for alignment accuracy. In a variant embodiment, the first organic light-emitting layer 181 and the second organic light-emitting layer 182 may also be fabricated by a wet process (solution process) such as a coating process or an inkjet printing process or a screen printing process.

The pixel structure 10 of the electroluminescent display panel of the embodiment may further include at least one A hole transport layer 201, at least a second hole transport layer 202, at least a third hole transport layer 203, and at least one electron transport layer 190. The first hole transport layer 201 is located in the first pixel region 101 and disposed between the first anode 121 and the first organic light-emitting layer 181; the second hole transport layer 202 is located in the second pixel region 102 and The third hole transport layer 203 is disposed in the third pixel region 103 and disposed between the third anode 123 and the second organic light-emitting layer 182. The electron transport layer 190 is located in the first pixel region 101, the second pixel region 102, and the third pixel region 103, and is located at the cathode (including the first cathode 141, the second cathode 142, and the third cathode 143). Between the first organic light-emitting layer 181 and the first. In addition, in order to improve the injection efficiency of the hole and the electron, the pixel structure 10 of the electroluminescent display panel may further include at least one electron injection layer (not shown) and at least one hole injection layer (not shown). Equal film layer.

In this embodiment, the first microresonator cavity 161, the second microresonator cavity 162, and the third microresonator cavity 163 have different cavity lengths by using the first hole transport layer 201 and the second hole transport layer. 202 and the third hole transport layer 203 have different thicknesses to achieve. For example, in the embodiment, the first primary color light L1 is red light, the second primary color light L2 is green light, and the third primary color light L3 is blue light, so the relationship of the resonant cavity length is as follows: The resonant cavity length of the resonant cavity 161 is greater than the resonant cavity length of the second micro resonant cavity 162, and the resonant cavity length of the second micro resonant cavity 162 is greater than the resonant cavity length of the third micro resonant cavity 163. That is, the thickness of the first hole transport layer 201 is greater than the thickness of the second hole transport layer 202, and the thickness of the second hole transport layer 202 is greater than the thickness of the third hole transport layer 203. In addition, the third hole transport layer 203 and the second hole The transport layer 202 and the first hole transport layer 201 may have the same carrier mobility, but are not limited thereto.

As shown in FIG. 1, in the first pixel region 101 and the second pixel region 102, a recombination zone RZ is located in the first organic light-emitting layer 181, and in the third pixel. In the region 103, the recombination region RZ is located in the second organic light-emitting layer 182. Therefore, when the display is performed, the first organic light-emitting layer 181 generates the first primary color light (red light) L1 and the second primary color light (green light) L2 in the first pixel region 101 and the second pixel region 102, And by the micro-resonator effect, the first primary color light L1 will only emit the first pixel region 101 and will not emit the second pixel region 102; similarly, the second primary color light L2 will only emit the second painting. The prime zone 102 does not emit the first pixel region 101. In addition, the second organic light-emitting layer 182 generates a third primary color light (blue light) L3 in the third pixel region 103, but does not generate light in the first pixel region 101 and the second pixel region 102. .

Please refer to Equation 1. Equation 1 is the relationship between the wavelength of the light emitted by the resonant cavity and the angle of light emission: λ(θ)=4n π Lcos θ/(φ(θ)-2 π n)........... ......................... Equation 1 where θ is the light exit angle λ(θ) is the wavelength of the light emitted by the cavity; n is the refraction Rate; φ(θ) is the phase change between the two mirrors; and L is the cavity length.

In the case where the electroluminescent display panel is viewed from the front view direction, the first pixel region 101, the second pixel region 102, and the third pixel region 103 can correctly emit the first having the correct wavelength toward the front view direction. Primary color light (red light) L1, second primary color light (green light) L2, and third primary color light (blue light) L3. However, as can be seen from the above formula 1, when the light emission angle is larger, the wavelength of the light emitted from the cavity is shifted in the short wavelength direction. Therefore, in the case where the electroluminescence display panel is viewed from a large viewing angle direction, the first pixel region 101, the second pixel region 102, and the third pixel region 103 are emitted toward the large viewing angle to have a wavelength smaller than the correct one. The light of the wavelength may have a color mixing problem with the light emitted by the adjacent sub-pixel area, which affects the display quality. Therefore, in order to solve the problem of color mixing when viewing the electroluminescent display panel in the direction of the large viewing angle, the pixel structure 10 of the electroluminescent display panel of the present embodiment further includes a first color filter pattern CF1 for allowing the first primary color light. L1 passes, and absorbs light rays other than the wavelength range of the first primary color light L1, for example, the second primary color light L2 and the third primary color light L3. The first color filter pattern CF1 is disposed in the first pixel region 101, and the color filter pattern is not disposed in the second pixel region 102 and the third pixel region 103. In the embodiment, the first color filter pattern CF1 is disposed on the inner surface of the upper cover substrate 2, but is not limited thereto. The function of the first color filter pattern CF1 is described in detail below.

In this embodiment, the first color filter pattern CF1 is a red color filter pattern. In the front view direction, the first color filter pattern CF1 disposed in the first pixel region 101 may further filter the first primary color light (red light) L1 to increase the color luminosity. The first pixel region 101 emits a small wavelength in a large viewing angle due to the wavelength shift effect of the microresonator. Light LX of the first primary color light (red light) L1. It is assumed that the light LX is green light, which is different from the third primary color light (blue light) L3, but the light LX is filtered by the first color filter pattern CF1 without being emitted by the third pixel region 103, so the light LX There is no color mixing problem with the third primary color light (blue light) L3. It is assumed that the light ray LX is blue light, which is different from the second primary color light (green light) L2, but the light ray LX is filtered by the first color filter pattern CF1 and is not emitted by the second pixel region 102, so the light LX and the second primary color light (green light) L2 do not cause color mixing problems. In addition, the second pixel region 102 emits light LY having a wavelength smaller than that of the second primary color light (green light) L2 in the large viewing angle direction due to the wavelength shift effect of the microresonator. It is assumed that the light LY is blue light, which is different from the first primary color light (red light) L1, but the light LY is filtered by the first color filter pattern CF1 without being emitted by the first pixel region 101. Further, when the light LY is blue light, it is the same color light as the third primary color light (blue light) L3, so that no color mixing problem occurs. Furthermore, the third pixel region 103 emits light LZ having a wavelength smaller than the third primary color light (blue light) L3 in the large viewing angle direction due to the wavelength shift effect of the microresonator. It is assumed that the light ray LZ is ultraviolet light, which is non-visible light, and thus does not cause color mixing problems with the adjacent first pixel region 101 and the second pixel region 102. It should be noted that in the embodiment, the first color filter pattern CF1 may further extend to a region between the first pixel region 101 and the second pixel region 102, and the first pixel region 101 and The area between the other adjacent third pixel regions 103, thereby more effectively shielding the light leakage in the large viewing angle direction, and more effectively avoiding the color mixing problem between adjacent sub-pixel regions. In addition, since the first color filter pattern CF1 is disposed only in the first pixel region 101, and the second pixel region 102 and the third pixel region 103 do not need to be provided with any color filter pattern, the effective reduction can be effectively reduced. Light loss. In contrast, conventional electroluminescent display panels use white organic light-emitting layers to produce white light, and then Color filters are provided in different sub-pixel regions to display a full-color display, so most of the white light is consumed when passing through the color filter, and the brightness is greatly reduced.

Please refer to Figure 2. FIG. 2 is a simplified schematic diagram showing the pixel structure of the electroluminescent display panel of the first embodiment of the present invention. In this embodiment, the width of the first color filter pattern CF1 can be calculated according to the following Equations 2 and 3.

Z≦(XY)*0.5*tan(90° -α )+a.........Form 2

b=Y+2*(Za)*tan α (wherein X is the width of the first pixel region 101; Y is the width of the light-emitting region 101A; the maximum viewing angle for avoiding the color mixing problem is α ; a is The thickness of the first color filter pattern CF1; Z is the distance between the upper cover substrate 2 and the first organic light-emitting layer 181; and b is the width of the first color filter pattern CF1.

Since the first color filter pattern CF1 is disposed in the first pixel region 101, the maximum value of the width b of the first color filter pattern CF1 is equal to the width X of the first pixel region 101, and thus The relationship of 2 can calculate the maximum value of the distance Z between the upper cover substrate 2 and the first organic light-emitting layer 181 in a state where the width b of the first color filter pattern CF1 is equal to the width X of the first-order pixel region 101. For example, when the width X of the first pixel region 101 is 33 μm and the width Y of the light-emitting region 101A is 10 μm The maximum viewing angle of the rice, which avoids the color mixing problem is α is 60 degrees, and the thickness of the first color filter pattern CF1 is 2 μm, then Z≦(33-10)*0.5*tan(90°-60°) +2 = 8.6395 (microns). That is, if the width b of the first color filter pattern CF1 is 33 μm, the distance Z between the upper cover substrate 2 and the first organic light-emitting layer 181 is about 8.6395 μm or less. In fact, if the distance Z between the upper cover substrate 2 and the first organic light-emitting layer 181 is 6 μm, the width b of the first color filter pattern CF1 should be about 23.856 μm according to the relationship of Equation 3.

Therefore, in the embodiment, the width of the first color filter pattern CF1 may be α according to the width of the first pixel region 101, the width of the light-emitting region 101A, and the maximum viewing angle that can avoid the color mixing problem, and the first color filter. The thickness of the pattern CF1 and the distance between the upper cover substrate 2 and the first organic light-emitting layer 181 are determined.

The pixel structure of the electroluminescent display panel of the present invention is not limited to the above embodiment. The pixel structure of the electroluminescent display panel of the other embodiments of the present invention and the modified embodiment will be sequentially described below, and the same is used in the following embodiments in order to facilitate the comparison of the differences of the embodiments and simplify the description. The symbols are labeled with the same elements, and are mainly described for the differences between the embodiments, and the repeated parts are not described again.

Please refer to Figure 3. FIG. 3 is a schematic view showing a pixel structure of an electroluminescence display panel according to a first variation of the first embodiment of the present invention. As shown in FIG. 3, unlike the pixel structure of the electroluminescent display panel of FIG. 1, in the pixel structure 10' of the electroluminescent display panel of the first modified embodiment, the first hole transport layer 201 Second electric The hole transport layer 202 and the third hole transport layer 203 have substantially the same thickness, but the first transparent electrode layer 221, the second transparent electrode layer 222 and the third transparent electrode layer 223 have different thicknesses, thereby achieving The first microresonator 161, the second microresonator 162, and the third microresonator 163 have effects of different cavity lengths.

Please refer to Figure 4. Fig. 4 is a view showing the pixel structure of the electroluminescence display panel of the second embodiment of the present invention. As shown in FIG. 4, unlike the pixel structure of the electroluminescent display panel of FIG. 1, in the second embodiment, the pixel structure 30 of the electroluminescent display panel further includes a black matrix pattern BM, which is disposed on the upper cover. The inner surface of the substrate 2 corresponds to the area between the respective pixel regions. The black matrix pattern BM has a function of shielding light leakage in a large viewing angle direction, so the first color filter pattern CF1 may not extend to a region between the first pixel region 101 and the second pixel region 102, and the first painting The area between the prime zone 101 and another adjacent third pixel region 103.

Please refer to Figure 5. Fig. 5 is a view showing the pixel structure of the electroluminescence display panel of the third embodiment of the present invention. As shown in FIG. 5, the pixel structure of the electroluminescent display panel of the third embodiment further includes a second color filter pattern CF2, which is different from the pixel structure of the electroluminescent display panel of FIG. The second pixel region 102 is for allowing the second primary color light L2 to pass, and absorbing light rays other than the wavelength range of the second primary color light L2, for example, the first primary color light L1 and the third primary color light L3. In the third embodiment, the first color filter pattern CF1 is a red color filter pattern, and the second color filter pattern CF2 is a green color filter pattern. The second color filter pattern CF2 can further shield light leakage in a large viewing angle direction, and more effectively avoid mixing between adjacent sub-pixel regions. Color problem. The second color filter pattern CF2 may be disposed only in the second pixel region 102, and the black matrix pattern BM may be selectively disposed corresponding to a region between each pixel region. Alternatively, the second color filter pattern CF2 may further extend to a region between the second pixel region 102 and the first pixel region 101, and the second pixel region 102 and the third pixel region 103 The area between them; in this case, the black matrix pattern need not be set corresponding to the area between the respective pixel areas. A color filter pattern is not provided in the third pixel area 103.

In the present invention, the color filter pattern is not limited to being disposed on the upper cover substrate, but may have different embodiments. Please refer to Figure 6. FIG. 6 is a schematic view showing the pixel structure of the electroluminescence display panel of the fourth embodiment of the present invention. As shown in FIG. 6, the pixel structure 50 of the electroluminescent display panel of the fourth embodiment includes a first color filter pattern CF1 disposed on the first cathode 141 and located in the first pixel region 101. That is, the first color filter pattern CF1 is tied to the other side of the first cathode 141 with respect to the first anode 121. Further, a black matrix pattern BM may be selectively disposed on the upper cover substrate 2 corresponding to a region between adjacent sub-pixel regions.

Please refer to Figure 7. FIG. 7 is a schematic view showing a pixel structure of an electroluminescence display panel according to a variation of the fourth embodiment of the present invention. As shown in FIG. 7, in the modified embodiment, the pixel structure 50' of the electroluminescent display panel includes a first color filter pattern CF1 disposed on the first cathode 141 and located in the first pixel region 101. And the second color filter pattern CF2 is disposed on the second cathode 142 and located in the second pixel region 102. In addition, a black matrix pattern BM may be selectively disposed on the upper cover substrate 2, The area between adjacent sub-pixel regions.

Please refer to Figure 8. FIG. 8 is a schematic view showing the pixel structure of the electroluminescence display panel of the fifth embodiment of the present invention. As shown in FIG. 8, the pixel structure 60 of the electroluminescent display panel of the fifth embodiment includes a first color filter pattern CF1 disposed between the first cathode 141 and the first anode 121 and located in the first painting. Within the district 101. For example, the first color filter pattern CF1 is disposed between the first anode 121 and the first transparent electrode layer 221. In the first pixel region 101, the first organic light-emitting layer 181 can generate first primary color light (red light) L1 and second primary color light (green light) L2, and the first color filter pattern CF1 can further compensate for the micro color filter pattern CF1. Insufficient cavity effect. Precisely, the first color filter pattern CF1 disposed between the first anode 121 and the first transparent electrode layer 221 can absorb or filter the second primary color light (green light) L2 emitted in the direction of the first anode 121, In order to further prevent the second primary color light (green light) L2 from being emitted outside the first pixel area 101. Further, a black matrix pattern BM may be selectively disposed on the upper cover substrate 2 corresponding to a region between adjacent sub-pixel regions.

Please refer to Figure 9. FIG. 9 is a schematic view showing a pixel structure of an electroluminescence display panel according to a variation of the fifth embodiment of the present invention. As shown in FIG. 9, in the modified embodiment, the pixel structure 60' of the electroluminescent display panel includes a first color filter pattern CF1 disposed between the first cathode 141 and the first anode 121 and located at the first The second color filter region CF2 and the second color filter pattern CF2 are disposed between the second anode 122 and the second transparent electrode layer 222 and located in the second pixel region 102. In the first pixel region 101 and the second pixel region 102, the first organic light-emitting layer 181 can generate the first The primary color light (red light) L1 and the second primary color light (green light) L2, and the first color filter pattern CF1 and the second color filter pattern CE2 can further compensate for the deficiency of the micro cavity effect. Precisely, the first color filter pattern CF1 disposed between the first anode 121 and the first transparent electrode layer 221 can absorb or filter the second primary color light (green light) L2 emitted in the direction of the first anode 121, In order to further prevent the second primary color light (green light) L2 from being emitted outside the first pixel region 101; similarly, the second color filter pattern CF2 disposed between the second anode 122 and the second transparent electrode layer 222 may The first primary color light (red light) L1 emitted toward the second anode 122 is absorbed or filtered to further prevent the first primary color light (red light) L1 from exiting beyond the second pixel region 102. Further, a black matrix pattern BM may be selectively disposed on the upper cover substrate 2 corresponding to a region between adjacent sub-pixel regions.

In various embodiments of the present invention, the first pixel region 101, the second pixel region 102, and the third pixel region 103 have different resonant cavity lengths by adjusting the first hole transport layer 201, The thickness of the second hole transport layer 202 and the third hole transport layer 203 is realized by adjusting the thicknesses of the first transparent electrode layer 221, the second transparent electrode layer 222 and the third transparent electrode layer 223, or by Adjusting the thickness of any of the layers between the anode and the cathode is achieved.

In summary, the pixel structure of the electroluminescent display panel of the present invention is only provided with color filters in a part of the sub-pixel region, which can avoid the color mixing problem between adjacent sub-pixel regions, and can effectively increase the display brightness. And reduce power consumption.

The above description is only a preferred embodiment of the present invention, and the patent application scope according to the present invention Equivalent changes and modifications made are intended to be within the scope of the present invention.

10‧‧‧Pixel structure of electroluminescent display panel

101‧‧‧The first picture area

102‧‧‧Second pixel area

103‧‧‧The third pixel area

1‧‧‧Substrate

121‧‧‧First anode

122‧‧‧Second anode

123‧‧‧ Third anode

141‧‧‧first cathode

142‧‧‧second cathode

143‧‧‧third cathode

161‧‧‧First microresonator

162‧‧‧Second microresonator

163‧‧‧The third micro-resonator

221‧‧‧First transparent electrode layer

222‧‧‧Second transparent electrode layer

223‧‧‧ third transparent electrode layer

181‧‧‧First organic light-emitting layer

182‧‧‧Second organic light-emitting layer

181A‧‧‧First organic luminescent material

181B‧‧‧Second organic luminescent material

182A‧‧‧ Third organic luminescent material

L1‧‧‧first primary color light

L2‧‧‧Second primary light

L3‧‧‧ third primary light

201‧‧‧First hole transport layer

202‧‧‧Second hole transport layer

203‧‧‧ third hole transport layer

190‧‧‧Electronic transport layer

CF1‧‧‧first color filter pattern

2‧‧‧Top cover substrate

LX‧‧‧Light

LY‧‧‧Light

LZ‧‧‧Light

10'‧‧‧Photon structure of electroluminescent display panel

30‧‧‧Photon structure of electroluminescent display panel

BM‧‧ black matrix pattern

40‧‧‧Photon structure of electroluminescent display panel

CF2‧‧‧Second color filter pattern

50‧‧‧Pixel structure of electroluminescent display panel

50'‧‧‧Photon structure of electroluminescent display panel

60‧‧‧Photon structure of electroluminescent display panel

60'‧‧‧Photon structure of electroluminescent display panel

RZ‧‧‧Recombination Zone

101A‧‧‧Lighting area

X‧‧‧The width of the first pixel area

Y‧‧‧width of the light-emitting area

Α‧‧‧ The biggest perspective to avoid color mixing problems

a‧‧‧The thickness of the first color filter pattern

Z‧‧‧The distance between the upper cover substrate 2 and the first organic light-emitting layer

b‧‧‧Width of the first color filter pattern

FIG. 1 is a schematic view showing a pixel structure of an electroluminescence display panel according to a first embodiment of the present invention.

FIG. 2 is a simplified schematic diagram showing the pixel structure of the electroluminescent display panel of the first embodiment of the present invention.

FIG. 3 is a schematic view showing a pixel structure of an electroluminescence display panel according to a first variation of the first embodiment of the present invention.

Fig. 4 is a view showing the pixel structure of the electroluminescence display panel of the second embodiment of the present invention.

Fig. 5 is a view showing the pixel structure of the electroluminescence display panel of the third embodiment of the present invention.

FIG. 6 is a schematic view showing the pixel structure of the electroluminescence display panel of the fourth embodiment of the present invention.

FIG. 7 is a schematic view showing a pixel structure of an electroluminescence display panel according to a variation of the fourth embodiment of the present invention.

FIG. 8 is a schematic view showing the pixel structure of the electroluminescence display panel of the fifth embodiment of the present invention.

FIG. 9 is a schematic view showing a pixel structure of an electroluminescence display panel according to a variation of the fifth embodiment of the present invention.

10‧‧‧Pixel structure of electroluminescent display panel

101‧‧‧The first picture area

102‧‧‧Second pixel area

103‧‧‧The third pixel area

1‧‧‧Substrate

121‧‧‧First anode

122‧‧‧Second anode

123‧‧‧ Third anode

141‧‧‧first cathode

142‧‧‧second cathode

143‧‧‧third cathode

161‧‧‧First microresonator

162‧‧‧Second microresonator

163‧‧‧The third micro-resonator

221‧‧‧First transparent electrode layer

222‧‧‧Second transparent electrode layer

223‧‧‧ third transparent electrode layer

181‧‧‧First organic light-emitting layer

182‧‧‧Second organic light-emitting layer

181A‧‧‧First organic luminescent material

181B‧‧‧Second organic luminescent material

182A‧‧‧ Third organic luminescent material

L1‧‧‧first primary color light

L2‧‧‧Second primary light

L3‧‧‧ third primary light

201‧‧‧First hole transport layer

202‧‧‧Second hole transport layer

203‧‧‧ third hole transport layer

190‧‧‧Electronic transport layer

CF1‧‧‧first color filter pattern

2‧‧‧Top cover substrate

LX‧‧‧Light

LY‧‧‧Light

LZ‧‧‧Light

RZ‧‧‧Recombination Zone

Claims (13)

A pixel structure of an electroluminescent display panel having a first pixel region, a second pixel region and a third pixel region, wherein the pixel structure of the electroluminescent display panel comprises: a substrate a first anode and a first cathode disposed on the substrate and located in the first pixel region; a second anode and a second cathode disposed on the substrate and located in the second pixel a third anode and a third cathode disposed on the substrate and located in the third pixel region; a first organic light emitting layer disposed in the first pixel region and the second time In the pixel region, between the first anode and the first cathode and between the second anode and the second cathode, wherein the first organic light-emitting layer comprises a first organic light-emitting material for emitting a a primary color light, and a second organic light emitting material for emitting a second primary color light; a second organic light emitting layer disposed in the first pixel region, the second pixel region, and the third painting In the prime zone, between the first anode and the first cathode, the second anode and the first Between the cathodes and between the third anode and the third cathode, wherein the second organic light-emitting layer comprises a third organic light-emitting material for emitting a third primary color light; and a first color filter pattern is disposed on The first pixel area to allow the first Passing a primary color light; wherein in the first pixel region, a first micro cavity is formed between the first anode and the first cathode, and in the second pixel region, the Forming a second micro-resonant cavity between the second anode and the second cathode, the first micro-resonator cavity and the second micro-resonator cavity have different cavity lengths, and the wavelength of the first primary color light is greater than The wavelength of the second primary color light, the wavelength of the second primary color light is greater than the wavelength of the third primary color light, and the color filter pattern is not disposed in the third pixel region. The pixel structure of the electroluminescent display panel of claim 1, wherein the first organic light-emitting layer is a continuous structural layer continuously distributed in the first pixel region and the second pixel region. The pixel structure of the electroluminescent display panel of claim 1, wherein the second organic light-emitting layer is a continuous structural layer continuously distributed in the first pixel region, the second pixel region and The third pixel area. The pixel structure of the electroluminescent display panel of claim 1, further comprising: at least one first hole transport layer located in the first pixel region; at least one second hole transport layer located at the a second pixel region; and at least a third hole transport layer located in the third pixel region; wherein the at least one first hole transport layer is different from the at least one second hole transport layer Thickness to respectively make the first microresonator and the second microresonator Have different cavity lengths. The pixel structure of the electroluminescent display panel of claim 1, further comprising: at least one first transparent electrode layer located in the first pixel region; at least one second transparent electrode layer located in the second And the at least one third transparent electrode layer is located in the third pixel region; wherein the at least one first transparent electrode layer and the at least one second transparent electrode layer have different thicknesses, respectively The first microresonator and the second microresonator have different resonant cavity lengths. The pixel structure of the electroluminescent display panel of claim 1, wherein the first primary color light comprises a red light, the second primary color light comprises a green light, and the third primary color light comprises a blue light. The pixel structure of the electroluminescent display panel of claim 1, wherein the second pixel region is not provided with a color filter pattern. The pixel structure of the electroluminescent display panel of claim 1, wherein the first color filter pattern further extends to a region between the first pixel region and the second pixel region, and The area between the first pixel region and another adjacent third pixel region. The pixel structure of the electroluminescent display panel according to claim 1 further comprising a black a matrix pattern, an area disposed between the first pixel region and the second pixel region, an area between the second pixel region and the third pixel region, and the first time The area between the pixel area and the third pixel area. The pixel structure of the electroluminescent display panel of claim 1, further comprising a second color filter pattern disposed in the second pixel region for allowing the second primary light to pass. The pixel structure of the electroluminescent display panel of claim 1, wherein the first cathode, the second cathode and the third cathode respectively comprise a transflective cathode, and the first anode and the second The anode and the third anode respectively comprise a reflective electrode. The pixel structure of the electroluminescent display panel of claim 1, wherein the first color filter pattern is located on the other side of the first cathode relative to the first anode. The pixel structure of the electroluminescent display panel of claim 1, wherein the first color filter pattern is located between the first cathode and the first anode.