JP4586481B2 - Transflective LCD panel - Google Patents

Description

  The present invention relates to a transflective liquid crystal display panel, and more particularly, to an MVA (Multi-domain Vertically Aligned) type transflective liquid crystal display panel in which disclination is suppressed and display quality is good.

  In general, liquid crystal display devices are characterized by thinness, light weight and low power consumption. In particular, TFT (Thin Film Transistor) type liquid crystal display devices are widely used from portable terminals to large-sized televisions. As a liquid crystal display panel used in this liquid crystal display device, a VA (vertically aligned) liquid crystal display panel is widely known as a liquid crystal display system having a quick response while maintaining a wide viewing angle.

  In the VA liquid crystal display panel 60, as shown in FIG. 4, a liquid crystal having a negative dielectric anisotropy is sealed between a pair of substrates 62 and 64, and one substrate 62 has a pixel electrode 61, A common electrode 63 is disposed on the other substrate 64. When the alignment films 66 and 67 on both the substrates 62 and 64 are both subjected to the vertical alignment process and no electric field is applied to the electrodes 61 and 63, the liquid crystal molecules 65 are vertically aligned as shown in FIG. Are arranged. Polarizing plates 68 and 69 are arranged in crossed Nicols on the outer sides of both substrates 62 and 64. When no electric field is applied between the electrodes 61 and 63, the liquid crystal molecules 65 between the substrates are arranged vertically, so that the linearly polarized transmitted light that has passed through one polarizing plate passes through the liquid crystal layer as it is. The other polarizing plate blocks the dark state, that is, black display. When an electric field is applied between the electrodes 61 and 63, as shown in FIG. 4B, the liquid crystal molecules 65 between the substrates are arranged horizontally, so that transmission of linearly polarized light that has passed through one polarizing plate is transmitted. When the light passes through the liquid crystal layer, it is birefringent to become elliptically polarized light, passes through the other polarizing plate, and becomes a bright state, that is, white display.

  In the VA liquid crystal display panel 60, when no electric field is applied between the electrodes 61 and 63, all the liquid crystal molecules 65 are aligned vertically on the alignment films 66 and 67. When applied, the direction in which each liquid crystal molecule 65 is tilted in the horizontal direction cannot be controlled, so that the liquid crystal molecules 65 are tilted in a random direction and are horizontally arranged as they are, so that display unevenness is conspicuous, and each pixel periphery Even in the region, there is a problem that the alignment of liquid crystal molecules is disturbed and disclination occurs.

  To regulate the direction in which the liquid crystal molecules standing vertically when an electric field is applied between the electrodes is tilted to achieve a uniform display state, the liquid crystal molecules are completely vertical when no electric field is applied between the electrodes. Instead, it is necessary to make it stand at a slight angle from the vertical axis, that is, the pretilt angle, and the distribution state in the tilt direction must be substantially equal for each pixel.

In order to further improve the viewing angle of the VA liquid crystal display panel, an MVA (Multi-domain vertically aligned) method is proposed in which a plurality of domains are formed in one pixel by providing protrusions and grooves in the pixel. (See Patent Documents 1 and 2 below)
The pixel configuration of this conventional MVA liquid crystal display panel will be described with reference to FIGS. 5 is a plan view of a pixel of a conventional MVA liquid crystal display panel 70, and FIG. 6 is a cross-sectional view taken along line CC in FIG.

  On a transparent first substrate 71 such as a glass substrate, scanning lines 72 and signal lines 73 are arranged in a matrix via a gate insulating film 71 '. A region surrounded by the scanning line 72 and the signal line 73 corresponds to one pixel, a pixel electrode 74 is disposed in this region, and a switching element connected to the pixel electrode 74 is disposed at the intersection of the scanning line 72 and the signal line 73. A certain TFT 75 is formed. A part of the pixel electrode 74 overlaps the adjacent scanning line 72 with an insulating film 71 ″ interposed therebetween, and this part functions as a storage capacitor. A plurality of slits 76 to be described later are formed in the pixel electrode 74. The alignment film 77 covering the electrode 74 is subjected to a vertical alignment process.

  A black matrix 79 is formed on a transparent second substrate 78 such as a glass substrate so as to divide each pixel, and a color filter 80 is laminated corresponding to each pixel. The color filter 80 is provided with one color filter 80 of red (R), green (G), and blue (B) corresponding to each pixel. A common electrode 81 made of, for example, a transparent electrode such as ITO is laminated on the color filter 80. A projection 82 having a predetermined pattern is formed on the common electrode 81, and the common electrode 81 and the projection 82 are subjected to a vertical alignment process. The alignment film 83 is covered.

  A liquid crystal layer 84 having a negative dielectric anisotropy is interposed between the substrates 71 and 78. When no electric field is generated between the pixel electrode 74 and the common electrode 81, the liquid crystal molecules 84 ′ are vertically aligned by being regulated by the alignment films 77 and 83, and an electric field is generated between the pixel electrode 74 and the common electrode 81. The liquid crystal molecules 84 'are inclined in the horizontal direction. At this time, the liquid crystal molecules 84 ′ are regulated by the slits 76 and the protrusions 82 and tilted in a predetermined direction, so that a plurality of domains can be formed in one pixel. FIG. 9 schematically shows a state where an electric field is generated between the pixel electrode 74 and the common electrode 81.

  A first polarizing plate 85 is disposed outside the first substrate 71, and a second polarizing plate 86 is disposed outside the second substrate 78, and the first polarizing plate 85 and the second polarizing plate 86 have their respective transmission axes. It is set to be orthogonal. The direction of both polarizing plates 85 and 86 is set by the relationship between the transmission axis and the direction of the liquid crystal molecules 84 ′ when tilted, but the transmission axis of the polarizing plates 85 and 86 and the direction of inclination of the liquid crystal molecules 84 ′ Since the relationship will be described later, here, for the sake of convenience, the transmission axis of the first polarizing plate 85 coincides with the extending direction of the scanning line 72, and the transmission axis of the second polarizing plate 86 coincides with the extending direction of the signal line 73. Set as follows.

  When no electric field is generated between the pixel electrode 74 and the common electrode 81, the liquid crystal molecules 84 'are aligned vertically, so that the linearly polarized transmitted light that has passed through the first polarizing plate 85 passes through the liquid crystal layer 84 as linearly polarized light. Then, it is blocked by the second polarizing plate 86 and a black display is obtained. In addition, when a predetermined voltage is applied to the pixel electrode 74 and an electric field is generated between the pixel electrode 74 and the common electrode 81, the liquid crystal molecules 84 ′ are inclined in the horizontal direction. The transmitted light becomes elliptically polarized light in the liquid crystal layer 84, passes through the second polarizing plate 86, and becomes white display.

  Next, the shapes of the slits 76 and the protrusions 82 will be described. The slit 76 is formed by removing a part of the pixel electrode 74 by a photolithography method or the like, and the protrusion 82 is formed in a predetermined pattern by using a resist made of an acrylic resin or the like by a photolithography method.

  The protrusions 82 are formed in a zigzag shape across a plurality of pixels, and the straight portions extend in a direction of 45 ° with respect to the signal lines 73 when viewed from the normal direction of the second substrate 78. In a substantially central portion of one pixel, a protrusion 82a extending from one adjacent pixel bends 90 ° and extends to an adjacent pixel again, and a protrusion 82b extending from the other adjacent pixel is a straight portion of the protrusion 82a bent at a right angle. And is located near the corner of the pixel.

  The slits 76 are formed so as to be positioned respectively in the middle of the plurality of protrusions 82. In this example, as shown in FIG. 5, three slits 76 are formed in each pixel electrode 74. A slit 76 a is formed between the protrusion 82 a and the protrusion 82 b, and a slit 76 b is formed between the protrusion 82 a and the edge portion of the pixel electrode 74. The slit 76 a has a center line parallel to the adjacent protrusion 82 and is at a 45 ° direction with respect to the signal line 73. The center line of the slit 76a corresponds to the extending direction of the slit 76a. Similarly, the extending direction of the slit 76b is parallel to the adjacent protrusion 82a. Since the extending direction of the protrusion 82a adjacent to the slit 76b is bent at a right angle within the pixel, the extending direction of the slit 76b is also bent.

  The liquid crystal molecules 84 ′ are inclined in the 90 ° direction with respect to the protrusions 82 and the slits 76, and are inclined in the opposite direction with respect to the protrusions 82 and the slits 76. A pair of crossed Nicols polarizers are arranged outside the pair of glass substrates, the angle between the transmission axis of the polarizer and the direction of the projection 82 is set to 45 °, and the normal direction of the polarizer The angle between the tilted liquid crystal molecules and the transmission axis of the polarizing plate is 45 °. When the angle between the tilted liquid crystal molecules and the transmission axis of the polarizing plate is 45 °, the transmitted light can be most efficiently obtained from the polarizing plate.

  This MVA liquid crystal display panel has the advantage that alignment film is not required to be rubbed and alignment division can be achieved by arranging linear structures. Therefore, the MVA liquid crystal display panel can obtain a wide viewing angle and high contrast. Further, since it is not necessary to perform rubbing, the manufacture of the liquid crystal display panel is simple, and there is no contamination due to shaving of the alignment film during rubbing, and the reliability of the liquid crystal display panel is improved.

  However, in the conventional MVA liquid crystal display panel, the actual display state of the liquid crystal molecules is not ideal, and thus an optimal display state cannot be obtained. In particular, in the peripheral portion of the pixel electrode 74, when the liquid crystal molecules 84 'are tilted, not only the protrusion 82 and the slit 76 but also the edge portion of the pixel electrode 74 is affected, so that display unevenness is likely to occur.

  FIG. 7 schematically shows the tilted state of the liquid crystal molecules. The arrow in the pixel electrode 74 indicates the tilt direction of the liquid crystal molecules, and the direction of the arrow is from the end close to the glass substrate having the protrusions 82 to the glass substrate having the pixel electrode 74 when the liquid crystal molecules are tilted. The direction toward the near end is shown.

  The liquid crystal molecules 84 ′ are regulated so as to incline in the direction of about 90 ° with respect to the protrusions 82 and the slits 76. The contour portions of the protrusion 82 and the slit 76 facing each other are in the same direction. The edge portion of the pixel electrode 74 affects the liquid crystal molecules to be inclined in the 90 ° direction, and the edge portion is not parallel to the slits 76 and the protrusions 82, so that the inclined state of the liquid crystal molecules 84 'is adversely affected. The influence of the edge portion is greatly different depending on the arrangement positional relationship between the slit 76 and the protrusion 82 near the edge portion. For example, in the area A1 in FIG. 7, the direction of the arrow near the slit 76 and the protrusion 82 is deviated by about 45 ° from the direction of the arrow near the edge, but in the area A2, the direction of the arrow near the slit 76 and the protrusion 82 is different. The direction of the arrow in the vicinity of the edge portion is shifted by about 135 °, and the tilted state of the liquid crystal molecules is greatly disturbed in the region A2. Therefore, display unevenness is more likely to occur in the area A2 than in the area A1.

  As described above, in the conventional MVA type liquid crystal display panel, the alignment of the liquid crystal molecules 84 ′ is disturbed due to the presence of the edge portion of the pixel electrode 74 in the peripheral portion of one end of each pixel in the pretilt direction. However, there was a problem that disclination occurred.

  In order to solve the problem peculiar to the MVA liquid crystal display panel (occurrence of misalignment region), a new structure is proposed in Patent Document 2 below. Hereinafter, an MVA type liquid crystal display panel 90 disclosed in the following Patent Document 2 will be described with reference to FIGS. 8 and 9, and the same configuration as the MVA type liquid crystal display panel 70 shown in FIGS. The same reference numerals are assigned to the portions, and detailed description of the portions is omitted. 8 is a plan view of a pixel of an MVA liquid crystal display panel disclosed in Patent Document 2 below, and FIG. 9 is a cross-sectional view taken along the line DD in FIG. FIG. 9A shows a state before an electric field is applied, and FIG. 9B shows a state after the electric field is applied.

  The MVA type liquid crystal display panel 90 as shown in FIGS. 8 and 9 is different from the MVA type liquid crystal display panel 70 shown in FIGS. 5 and 6 in order to control the alignment of liquid crystal molecules. This is that an auxiliary projection 89 is provided on the projection 82 outside the effective pixel range, and the other configuration is substantially the same as the configuration of the MVA liquid crystal display panel 70 shown in FIGS. According to the MVA liquid crystal display panel 90, the influence of the electric field from the edge portion of the pixel electrode 74 and the adjacent pixel on the liquid crystal molecules 84 ′ is reduced, and the generation of disclination can be effectively suppressed. It can be done.

In portable devices that use liquid crystal display panels, transflective liquid crystal display panels having both transmissive and reflective properties have been developed to reduce power consumption. In such a transflective liquid crystal display panel, the application of the MVA method as described above can be seen, and in Patent Document 3 below, in the transflective liquid crystal display device, the reflective portion on the color filter side and In addition to providing slits in the common electrode of the transmissive part, and an alignment means for dividing the orientation of liquid crystal molecules in the vicinity of the pixel electrode of the reflective part and the pixel electrode of the transmissive part, an open area or a convex body is disclosed. ing.
JP-A-11-024225 (Claims, FIGS. 10 to 12) JP 2001-083517 A (paragraphs [0007] to [0037), FIGS. 32 to 34) JP 2004-069767 A (claims, paragraphs [0043] to [0078], FIGS. 1 to 14)

However, in the MVA liquid crystal display panel configured as described above,
(1) Due to the difference in level difference, the position where the projection is formed, the variation in the shape of the projection, and the like, the positional relationship between the pixel electrode and the auxiliary projection is inevitably shifted in manufacturing, and this causes uneven brightness. There is,
(2) In the liquid crystal display panel, spherical spacers are dispersed to form a cell gap, and when this spherical spacer is placed on the auxiliary protrusion, the cell gap becomes particularly large in this portion, and
(3) Since the protrusion is provided on the pixel electrode, the liquid crystal molecules are slightly inclined due to the inclination of the protrusion even when no voltage is applied, so that light leaks and the contrast decreases.
There is a problem that
In addition, the above-described transflective liquid crystal display panel has the same problems as in the above (3), and in the case where no protrusion is provided, the alignment of liquid crystal molecules is controlled only by slits and opening regions. Therefore, there is a problem that the alignment control effect of liquid crystal molecules is weak. In addition, in a small transflective liquid crystal display panel, since the size of the pixel itself is small in order to realize high definition, it is necessary to provide a storage capacitor electrode as large as possible. Therefore, even if the slit is provided in the pixel electrode of the reflection portion, the pixel electrode and the drain electrode are at the same potential, so that the liquid crystal molecules are not regulated by the slit.

  Moreover, since the conventional MVA type liquid crystal display panel does not consider application to a transflective liquid crystal display panel, it is difficult to adopt as a configuration of a transmission part of the transflective liquid crystal display panel as it is, Even if it is forcibly adopted, the continuity of the alignment direction of the liquid crystal between the transmission part and the reflection part cannot be maintained, and there is a problem that discnation occurs.

  Even in a small-sized (portable 2 inch type) liquid crystal display device, the demand for image quality is higher than before, and the MVA method, which has features such as a wide viewing angle and high contrast compared to the STN method and the TN method, is adopted. Therefore, it is urgent to solve the problems of the above-mentioned MVA transflective liquid crystal display panel.

Accordingly, the inventors of the present invention have a problem with the above-described MVA type liquid crystal display panel that the protrusions are provided in a zigzag shape on the common electrode at a position facing the pixel electrode, and the zigzag protrusions. This is caused by providing auxiliary projections on the pixel electrode side in order to improve the above-mentioned drawbacks. Similarly, in the above-described transflective liquid crystal display panel, when providing projections, projections are formed on the surface of the pixel electrodes. All of these problems can be solved by providing no orientation protrusions on the surface of the pixel electrode and providing an orientation regulating means extending from the transmission part to the reflection part. considered should, therefore transflective liquid crystal display panel result of various experiments per structure of the surface of the common electrode facing the pixel electrode, the transmission unit and counter projections as alignment regulating means If so provided as one piece continuous in part, the above problem is found that it is possible to solve all, it was accomplished the present invention.

  That is, the present invention provides an MVA transflective liquid crystal display panel having a large auxiliary capacity, less disclination, less display unevenness and brightness unevenness, and bright and good display quality. With the goal.

The above object of the present invention can be achieved by the following configurations. That is, the invention of the transflective liquid crystal display panel according to claim 1 includes a pixel electrode provided with a reflection portion provided with a pixel electrode at each position partitioned by signal lines and scanning lines arranged in a matrix . A first substrate on which a transmissive portion is formed; a second substrate on which a color filter, a common electrode, and a protrusion are formed; an alignment film that is laminated on both the substrates and subjected to a vertical alignment process; and between the two substrates And a liquid crystal layer having a negative dielectric anisotropy, and when no electric field is applied to the liquid crystal layer, liquid crystal molecules are vertically aligned, and when an electric field is applied to the liquid crystal layer, the liquid crystal layer is regulated by the protrusions. In the transflective liquid crystal display panel in which liquid crystal molecules are arranged in a tilted direction, the protrusion is provided as a continuous body in the transmissive part and the reflective part .

According to a second aspect of the present invention, in the transflective liquid crystal display panel according to the first aspect, the protrusion has a shape in which the letter Y and the letter Y are combined so as to be vertically symmetrical. It is characterized by. The transflective liquid crystal display panel according to claim 1, wherein the protrusion may have a substantially X shape with both ends divided into two. According to the present invention, “substantially X-shaped with two ends divided into two ends”
(1) A shape in which the letter X itself is extended vertically.
(2) a shape in which a Y character and a reverse Y character are combined so as to be vertically symmetrical ;
Both are included.

According to a third aspect of the present invention, in the transflective liquid crystal display panel according to the first aspect, the protrusion is long in the extending direction of the pixel electrode and has a square shape with a gentle corner. And

According to a fourth aspect of the present invention, in the transflective liquid crystal display panel according to any one of the first to third aspects, the thickness of the liquid crystal layer is different between the reflective portion and the transmissive portion. Features.

By providing the above configuration, the present invention has the following excellent effects. That is, according to the first aspect of the present invention, since the protrusion is provided as a continuous unit in the transmission part and the reflection part, the orientation direction of the liquid crystal molecules extends over 360 °, and the reflection part also has a protrusion. Since the orientation of liquid crystal molecules is regulated and the orientation changes continuously between the transmissive part and the reflective part, there is little generation of disclination, little display unevenness and brightness unevenness, and good display quality An MVA transflective liquid crystal display panel can be obtained.

In addition, according to the inventions of claims 2 and 3, the shape of the protrusion is simple, and even if there is a positional shift when the first substrate and the second substrate are integrated, there is little influence on the alignment of the liquid crystal molecules, A highly reliable transflective liquid crystal display panel can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below show embodiments of a transflective liquid crystal display panel for embodying the technical idea of the present invention. It is not intended that the present invention be limited to what is described herein. In addition, the liquid crystal display panel shown in the embodiment is a small liquid crystal display panel mainly used in a display unit for a mobile device such as a digital camera or a mobile phone, and has a resolution of more than 300 ppi. It shows a panel with about 640 × 480 pixels (VGA) and 320 × 240 pixels (QVGA), and the size of one pixel is considerably smaller than a liquid crystal display panel for TVs such as 40 inches. It has become a thing.

  1 and 2 show a transflective liquid crystal display panel according to an embodiment. 1 is a schematic plan view showing one pixel portion of the transflective liquid crystal display panel through a color filter, and FIG. 2 is a cross-sectional view taken along the line AA in FIG.

  1 and 2, a transflective liquid crystal display panel 10 includes a scanning line 13 and signal lines 14 arranged in a matrix on a transparent first substrate 11 such as a glass substrate with a gate insulating film 12 interposed therebetween. . A region surrounded by the scanning line 13 and the signal line 14 corresponds to one pixel, and a pixel electrode 15 made of a transparent conductive material such as ITO is disposed in this region. This pixel is divided into a reflection part and a transmission part at an intermediate part, and a slit 17 which will be described later is formed at the center of the pixel electrode 15 of the transmission part. A TFT 16 which is a switching element connected to the pixel electrode 15 is formed at the intersection of the scanning line 13 and the signal line 14.

  The gate electrode G of the TFT 16 is connected to the scanning line 13, the source electrode S is connected to the signal line 14, and the drain electrode D is formed above the auxiliary capacitance electrode 31 provided over almost the entire reflective portion. Is provided. A transparent insulating film 32 and an interlayer insulating film 33 are provided over the entire surface of the TFT 16 and the surface of the gate insulating film 12, and the surfaces are flattened to make the cell gap constant. Note that the surface of the interlayer insulating film 33 located in the reflecting portion is slightly uneven in order to obtain diffusely reflected light with no directivity, and the surface of the interlayer insulating film 33 in the reflecting portion is Is provided with a reflective electrode 34 made of a highly reflective metal such as silver or aluminum, and a pixel made of a transparent conductive member such as ITO on the surface of the reflective electrode 34 and the surface of the interlayer insulating film 33 in the transmissive portion. An electrode 15 is provided. The surface of the pixel electrode 15 and the slit 17 are covered with an alignment film 18 subjected to a vertical alignment process. Note that the pixel electrode 15 in the reflective portion and the drain electrode D of the TFT 16 are electrically connected by a contact hole 35.

  A black matrix (not shown) is formed on the transparent second substrate 19 such as a glass substrate so as to divide each pixel, and a color filter 21 is laminated corresponding to each pixel. The color filter 21 is provided with one color filter 21 of red (R), green (G), and blue (B) corresponding to each pixel. A common electrode 22 made of a transparent electrode such as ITO is laminated on the color filter 21, a projection 23 having a predetermined pattern is formed on the common electrode 22, and the common electrode 22 and the projection 23 are subjected to a vertical alignment process. Covered with an alignment film 24.

  In this embodiment, since the color filter 21 having the same thickness is used in the reflection portion and the transmission portion, a cutout portion 36 where no color filter is present in a part of the color filter 21 in the reflection portion and a top coat 37 having a predetermined thickness. Is provided. The top coat 37 is provided over the entire reflecting portion. In addition, the notch 36 is provided so that the incident light passes through the color filter twice at the time of incidence and at the time of emission at the reflection part, so that a part with no color is provided and the color tone is the same as that of the transmission part. It is what.

  Further, a liquid crystal layer 25 having a negative dielectric anisotropy is interposed between the substrates 11 and 19. When no electric field is generated between the pixel electrode 15 and the common electrode 22, the liquid crystal molecules are regulated vertically by the alignment films 18 and 24, and when an electric field is generated between the pixel electrode 15 and the common electrode 22, the liquid crystal is aligned. Molecules tilt horizontally. At this time, the liquid crystal molecules in the transmission part are regulated by the slits 17 and the protrusions 23 and tilted in a predetermined direction, so that a plurality of domains can be formed in one pixel. Further, λ / 4 phase difference plates 39 and 40 are arranged outside the substrates 11 and 19, respectively.

  Next, the shape of the slit 17 and the protrusion 23 will be described. The slit 17 is formed by removing a part of the pixel electrode 15 by a photolithography method or the like, and the protrusion 23 is formed in a predetermined pattern by using, for example, a resist made of acrylic resin or the like by a photolithography method. The protrusion 23 is provided from the transmission part to the reflection part at a position facing the slit 17 along the extending direction of the rectangular pixel electrode 15.

  The slit 17 is formed at the center of the pixel electrode 15 in the transmissive portion so as to be located in the middle of the protrusion 23. In this example, the slit 17 is provided in a rectangular shape extending in the extending direction of the pixel electrode.

Further, the liquid crystal properties required in the reflective portion are the same as the liquid crystal used in the MVA liquid crystal display panel. When no electric field is generated between the pixel electrode 15 and the common electrode 22, the liquid crystal molecules are aligned. Since the liquid crystal molecules are inclined in the horizontal direction when an electric field is generated between the pixel electrode 15 and the common electrode 22, the liquid crystal molecules are inclined in the horizontal direction. In addition, the MVA method can be provided by providing orientation regulating means. That is, in the reflective portion, even if a slit is provided in the pixel electrode 15 as in the transmissive portion, the alignment cannot be regulated due to the influence of the drain electrode. Can be aligned in a predetermined direction, and since the alignment is continuously controlled between the transmissive part and the reflective part, the liquid crystal molecules are continuously aligned in the predetermined direction from the transmissive part to the reflective part. It can be oriented. In the present embodiment, the protrusion 23 has a shape in which the letter Y and the letter Y in reverse are combined so as to be vertically symmetrical .

  Therefore, according to the transflective liquid crystal display panel 10 of the present embodiment, since the alignment regulating means is continuously provided from the transmissive part to the reflective part, there is little generation of disclination, and display unevenness and brightness unevenness are also caused. Thus, an MVA transflective liquid crystal display panel with a small display quality is obtained. Especially in the case of small liquid crystal panels, how to secure the size of the auxiliary capacity will become increasingly important in the future, so the shape of the above example is a high-definition liquid crystal display that is used especially for the display part of mobile devices. Suitable for panels.

  In the present invention, the shape of the protrusion 23 is not limited to the shape shown in FIG. 1 used in the embodiment, and various modifications are possible. For example, FIG. 3 shows an example in which the protrusion 23 is long in the extending direction of the pixel electrode and has a corner having a gentle square shape. Similar actions and effects can be achieved.

FIG. 3 is a schematic plan view showing one pixel portion of a transflective liquid crystal display panel according to the present invention through a color filter. It is sectional drawing along the AA line of FIG. FIG. 6 is a schematic plan view showing one pixel portion of another specific example of the transflective liquid crystal display panel according to the present invention as seen through a color filter. It is a schematic plan view of a conventional VA liquid crystal display device. FIG. 10 is a plan view of a pixel of a conventional MVA liquid crystal display panel 70. It is sectional drawing along CC line of FIG. It is a figure which shows typically the inclination state of the liquid crystal molecule in the conventional MVA type liquid crystal display panel. It is a top view of the pixel of another conventional MVA-type liquid crystal display panel. FIGS. 8A and 8B are cross-sectional views taken along the line D-D in FIG. 8, in which FIG. 8A shows a state before an electric field is applied, and FIG. 8B shows a state after the electric field is applied.

Explanation of symbols

10 transflective liquid crystal display panel 11 first substrate 13 scanning line 14 signal line 15 pixel electrode 16 TFT
17 Slits 18 and 24 Alignment film 19 Second substrate 22 Common electrode 23 Projection 25 Liquid crystal layer 31 Auxiliary capacitance electrode 34 Reflective electrode

Claims (4)

A first substrate on which a reflection part having a pixel electrode at each position partitioned by signal lines and scanning lines arranged in a matrix and a transmission part having a pixel electrode are formed;
A second substrate on which a color filter, a common electrode and a protrusion are formed;
An alignment film subjected to a vertical alignment process laminated on both the substrates;
A liquid crystal layer having a negative dielectric anisotropy disposed between the two substrates, and when no electric field is applied to the liquid crystal layer, liquid crystal molecules are aligned vertically, and when an electric field is applied to the liquid crystal layer, In the transflective liquid crystal display panel in which the liquid crystal molecules are inclined and arranged in the direction regulated by the protrusions,
The transflective liquid crystal display panel according to claim 1, wherein the protrusion is provided as an integrated body that is continuous in the transmissive portion and the reflective portion. 2. The transflective liquid crystal display panel according to claim 1, wherein the protrusion has a shape in which a letter Y and an inverted letter Y are combined so as to be vertically symmetrical .   The transflective liquid crystal display panel according to claim 1, wherein the protrusion is long in the extending direction of the pixel electrode and has a square shape with a gentle corner.   4. The transflective liquid crystal display panel according to claim 1, wherein the reflective portion and the transmissive portion have different thicknesses of the liquid crystal layer. 5.

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