TWI845230B - Pixel circuit and display panel using the same - Google Patents

Abstract

A micro LED pixel circuit includes: an emission circuit for emission; a first voltage read circuit coupled to the emission circuit for reading a threshold voltage; a resetting circuit coupled to the emission circuit for resetting a voltage of a second node; a data read circuit coupled to the emission circuit for writing a data signal into the micro LED pixel circuit; and a second voltage read circuit coupled to the emission circuit for writing a second reference voltage into the third node.

Description

Pixel circuit and display panel using the same

The present invention relates to a pixel circuit and a display panel using the same, and in particular to a micro-light-emitting diode (Micro LED, μLED) pixel circuit and a display panel using the same.

Micro LED can emit light autonomously, does not require backlight, and saves power. It can still be clearly identified in an outdoor sunlight environment. In addition, Micro LED has the characteristics of high efficiency, high brightness, high reliability, and fast response time. It is more energy-saving, simple in structure, small in size, and thin. Therefore, it has gradually become the best display screen for wearable devices.

As for the current micro-luminescent diode pixel circuit, its compensation effect is poor, and the circuit surface area required for the pixel circuit is also large, which is an area that needs to be improved.

According to one aspect of the present invention, a micro-LED (Micro LED, μLED) pixel circuit is proposed, comprising: a light-emitting circuit for emitting light; a first voltage reading circuit coupled to the light-emitting circuit, the first voltage reading circuit reading a critical voltage; a reset circuit coupled to the light-emitting circuit for resetting a voltage of a second node; a data reading circuit coupled to the light-emitting circuit for writing a data signal into the micro-LED pixel circuit; and a second voltage reading circuit coupled to the light-emitting circuit, the second voltage reading circuit writing a second reference voltage to the third node.

According to another aspect of the present invention, a micro-LED (Micro LED, μLED) display panel is proposed, comprising: a plurality of micro-LED pixel circuits. Each of the micro-luminescent diode pixel circuits includes: a light-emitting circuit for emitting light; a first voltage reading circuit coupled to the light-emitting circuit, the first voltage reading circuit reading a critical voltage; a reset circuit coupled to the light-emitting circuit for resetting a voltage of a second node; a data reading circuit coupled to the light-emitting circuit for writing a data signal into the micro-luminescent diode pixel circuit; and a second voltage reading circuit coupled to the light-emitting circuit, the second voltage reading circuit writing a second reference voltage to the third node.

In order to better understand the above and other aspects of the present invention, the following is a specific example and a detailed description with the attached drawings as follows:

100, 500, 600, 710: Micro-luminescent diode pixel circuit

110, 510, 610: light-emitting circuit

120, 520, 620: First voltage reading circuit

130, 530, 630: Reset circuit

140, 540, 640: Data reading circuit

150, 550, 650: Second voltage reading circuit

T1~T9: Transistor

C1: Capacitor

N1~N3: Node

EM(n), SN(n), SN(n-1), SN(n+1), VC(n): control signal

Data: data signal

Vss: Ground

Vdd: operating voltage

Vref1, Vref2: reference voltage

P1~P3: Stage

700: Micro-luminescent diode display panel

Figure 1 shows a micro-luminescent diode pixel circuit according to an embodiment of the present invention.

Figure 2 shows a signal waveform diagram of a micro-luminescent diode pixel circuit according to an embodiment of the present invention.

Figures 3A to 3C respectively show the operation schematic diagrams of the reset phase P1, the voltage reading and data writing phase P2, and the luminescence phase P3 of the micro-luminescent diode pixel circuit 100 in an embodiment of the present case.

FIG. 4A shows a voltage-current curve diagram of a micro-luminescent diode pixel circuit of the prior art, and FIG. 4B shows a voltage-current curve diagram of a micro-luminescent diode pixel circuit according to an embodiment of the present invention.

FIG. 5A shows a micro-luminescent diode pixel circuit according to an embodiment of the present invention. FIG. 5B shows a signal waveform diagram of a micro-luminescent diode pixel circuit according to an embodiment of the present invention.

FIG. 6A shows a micro-luminescent diode pixel circuit according to an embodiment of the present invention. FIG. 6B shows a signal waveform diagram of a micro-luminescent diode pixel circuit according to an embodiment of the present invention.

Figure 7 shows a schematic diagram of a micro-luminescent diode display panel according to an embodiment of the present invention.

The technical terms in this specification refer to the customary terms in this technical field. If this specification explains or defines some terms, the interpretation of these terms shall be based on the explanation or definition in this specification. Each embodiment disclosed in this disclosure has one or more technical features. Under the premise of possible implementation, a person with ordinary knowledge in this technical field can selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

FIG. 1 shows a micro-luminescent diode pixel circuit according to an embodiment of the present invention. FIG. 2 shows a signal waveform diagram of a micro-luminescent diode pixel circuit according to an embodiment of the present invention. The micro-luminescent diode pixel circuit 100 includes: a luminescent circuit 110, a first voltage reading circuit 120, a reset circuit 130, a data reading circuit 140 and a second voltage reading circuit 150. In the present specification, the first voltage reading circuit 120 and the second voltage reading circuit 150 are used for voltage compensation.

The light-emitting circuit 110 is used for emitting light. The light-emitting circuit 110 includes: a first transistor T1, a second transistor T2, a fourth transistor T4 and a micro-luminescent diode 111. The first transistor T1 includes: a first end coupled to an operating voltage Vdd, a second end coupled to a first node N1, and a control end receiving a light-emitting control signal EM(n), where n is a positive integer, and n represents that the micro-luminescent diode pixel circuit 100 is located in the nth row of a display panel (shown later). For example, if the display panel has 270 gate scanning lines, then n=1~270. The second transistor T2 includes: a first end coupled to the first node N1, a second end coupled to the first end of the fourth transistor T4, and a control end coupled to the second node N2. The fourth transistor T4 includes: a first end coupled to the second end of the second transistor, a second end coupled to the first end of the micro-luminescent diode 111, and a control end receiving the luminescence control signal EM(n). The micro-luminescent diode 111 includes a first end coupled to the second end of the fourth transistor T4, and a second end coupled to the ground Vss.

The first voltage reading circuit 120 is coupled to the light-emitting circuit 110. The first voltage reading circuit 120 includes: a third transistor T3. The third transistor T3 includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node N2, and a control end receiving the n-th level serial control signal (or scan signal) SN(n). The first voltage reading circuit 120 reads the critical voltage of the second transistor T2.

The reset circuit 130 is coupled to the light-emitting circuit 110. The reset circuit 130 includes: a fifth transistor T5. The fifth transistor T5 includes: a first end coupled to the second node N2, a second end coupled to a first reference voltage Vref1, and a control end receiving the n-1th level serial control signal SN(n-1). The reset circuit 130 is used to reset a voltage of the second node N2.

The data read circuit 140 is coupled to the light-emitting circuit 110. The data read circuit 140 includes: a sixth transistor T6. The sixth transistor T6 includes: a first end coupled to the first node N1, a second end receiving the data signal Data, and a control end receiving the n-th level serial control signal SN(n). The data read circuit 140 writes the data signal Data into the micro-luminescent diode pixel circuit 100.

The second voltage reading circuit 150 is coupled to the light-emitting circuit 110. The second voltage reading circuit 150 includes: a seventh transistor T7, an eighth transistor T8 and a capacitor C1. The seventh transistor T7 includes: a first end coupled to the first node N1, a second end coupled to the third node N3, and a control end receiving the light-emitting control signal EM(n). The eighth transistor T8 includes: a first end coupled to a second reference voltage Vref2, a second end coupled to the third node N3, and a control end receiving the compensation control signal (also referred to as a voltage compensation signal) VC(n). The capacitor C1 includes: a first end coupled to the third node N3, and a second end coupled to the second node N2. The second voltage reading circuit 150 writes the second reference voltage Vref2 to the third node N3.

As shown in FIG. 2, in an embodiment of the present invention, the micro-luminescent diode pixel circuit 100 has three operation stages: reset stage P1, compensation and data writing stage P2, and luminescence stage P3. These three stages will be described below.

Figures 3A to 3C respectively show the operation schematic diagrams of the reset phase P1, the voltage reading and data writing phase P2, and the light-emitting phase P3 of the micro-luminescent diode pixel circuit 100 in an embodiment of the present case.

As shown in Figure 3A, in the reset phase P1, the compensation control signal VC(n) and the n-1th stage serial control signal SN(n-1) are logically low, so that the eighth transistor T8 and the fifth transistor T5 are turned on, pulling the voltage of the second node N2 to the first reference voltage Vref1 and the voltage of the third node N3 to the second reference voltage Vref2. In addition, in the reset phase P1, the second transistor T2 is turned on in advance to prepare for the next phase P2.

As shown in FIG. 3B , in the voltage reading and data writing phase P2, the compensation control signal VC(n) and the n-th stage serial control signal SN(n) are logically low, so that the eighth transistor T8, the second transistor T2, the third transistor T3 and the sixth transistor T6 are turned on. Since the sixth transistor T6 is turned on, the data signal Data is written to the first node N1. Since the eighth transistor T8 is turned on, the voltage of the third node N3 is pulled to the second reference voltage Vref2. In addition, the data signal Data can be written into the second node N2 through the sixth transistor T6, the second transistor T2, and the third transistor T3, but the voltage of the second node N2 is clamped at N2=Data-|VTH|, where VTH represents the critical voltage of the second transistor T2. That is, in the voltage reading and data writing phase P2, the gate voltage of the second transistor T2 (that is, the voltage of the second node N2) is clamped (compensated) at N2=Data-|VTH|, and the data signal Data is written into the pixel circuit 100. It can also be said that in the voltage reading and data writing phase P2, the first voltage reading circuit 120 reads the critical voltage VTH of the second transistor T2, and the data reading circuit 140 writes the data signal Data into the micro-luminescent diode pixel circuit 100.

As shown in FIG. 3C , in the light-emitting stage P3 , the light-emitting control signal EM(n) is logically low, so that the first transistor T1 , the second transistor T2 , the fourth transistor T4 and the seventh transistor T7 are turned on, and the current can flow through the micro-LED 111 to make the micro-LED 111 emit light.

In detail, after entering the light-emitting phase P3, the voltage of the first node N1 is the operating voltage Vdd; the voltage of the third node N3 changes from the second reference voltage Vref2 to the operating voltage Vdd. Therefore, a voltage change △V=Vdd-Vref2 is generated at the third node N3. This voltage change △V is coupled to the second node N2 through the capacitor C1, so that the voltage of the second node N2 is: N2=Data-|VTH|+(Vdd-Vref2)*C1/(C1+CTFT1), where CTFT1 represents the parasitic capacitance of the first transistor T1. When the effective capacitance of the parasitic capacitor CTFT1 is much smaller than the capacitance of the capacitor C1, ideally, the voltage of the second node N2 can be considered to be very close to: N2 = Data-|VTH| + (Vdd-Vref2).

From the above, it can be seen that in the first embodiment of the present case, the voltage of the second node N2 (that is, the gate voltage of the second transistor T2) is only affected by "C1/CTFT1" in principle. Therefore, compared with the current technology, the first embodiment of the present case has better control and compensation.

FIG. 4A shows a voltage-current curve diagram of a micro-luminescent diode pixel circuit of the prior art, and FIG. 4B shows a voltage-current curve diagram of a micro-luminescent diode pixel circuit according to an embodiment of the present invention.

In FIG. 4A and FIG. 4B , "VTH+0V", "VTH-0.5V" and "VTH+0.5V" represent increasing the critical voltage of the second transistor T2 by 0V, decreasing by 0.5V and increasing by 0.5V, respectively; and "Vdd-0V", "Vdd-0.5V" and "Vdd-1V" represent decreasing the operating voltage Vdd by 0V, decreasing by 0.5V and decreasing by 1V, respectively. "VTH+0V", "VTH-0.5V" and "VTH+0.5V" are used to simulate the situation when the critical voltage drifts. "Vdd-0V", "Vdd-0.5V" and "Vdd-1V" are used to simulate the voltage drop caused by the micro LED current. The voltage drop here refers to the voltage drop caused when the micro LED current flows through the Vdd metal trace on the display panel in the known micro LED pixel circuit, so that the micro LEDs on the upper and lower sides of the panel receive different driving voltages, resulting in poor display uniformity.

Tables 1 and 2 below list the comparison of the current of the micro-LED of an embodiment of the present invention and the prior art.

Comparing Figure 4A and Figure 4B, it can be seen that in the first embodiment of the present invention, since △I becomes smaller (from the known 4.7μ to 2.7μ), even if there is a voltage drop caused by the micro LED current, the current change amount of the first embodiment of the present invention is better than the known technology.

FIG. 5A shows a micro-luminescent diode pixel circuit according to an embodiment of the present invention. FIG. 5B shows a signal waveform diagram of the micro-luminescent diode pixel circuit according to an embodiment of the present invention. The micro-luminescent diode pixel circuit 500 includes: a luminescent circuit 510, a first voltage reading circuit 520, a reset circuit 530, a data reading circuit 540 and a second voltage reading circuit 550. Basically, the circuit structure of the micro-LED pixel circuit 500 is the same as that of the micro-LED pixel circuit 100, except that the micro-LED pixel circuit 100 is controlled by the n-1th serial control signal SN(n-1) and the nth serial control signal SN(n), while the micro-LED pixel circuit 500 is controlled by the nth serial control signal SN(n) and the n+1th serial control signal SN(n+1).

The light-emitting circuit 510 includes: a first transistor T1, a second transistor T2, a fourth transistor T4 and a micro-light-emitting diode 111; the first transistor T1 includes: a first end coupled to an operating voltage Vdd, a second end coupled to a first node N1, and a control end receiving a light-emitting control signal EM(n); the second transistor T2 includes: a first end coupled to the first node N1, a second end coupled to the The first end of the fourth transistor T4 and a control end are coupled to the second node N2; the fourth transistor T4 includes: a first end coupled to the second end of the second transistor T2, a second end coupled to the first end of the micro-light-emitting diode 111, and a control end to receive the light-emitting control signal EM(n); the micro-light-emitting diode 111 includes a first end coupled to the second end of the fourth transistor T4, and a second end grounded.

The first voltage reading circuit 520 includes: a third transistor T3, the third transistor T3 includes: a first end coupled to the second end of the second transistor T2, a second end coupled to the second node N2, and a control end receiving an n+1th stage serial control signal SN(n+1).

The reset circuit 530 includes: a fifth transistor T5, the fifth transistor T5 includes: a first end coupled to the second node N2, a second end coupled to a first reference voltage Vref1, and a control end receiving an n-th level serial control signal SN(n).

The data read circuit 540 includes: a sixth transistor T6, the sixth transistor T6 includes: a first end coupled to the first node N1, a second end receiving the data signal Data, and a control end receiving the n+1th stage serial control signal SN(n+1).

The second voltage reading circuit 550 includes: a seventh transistor T7, an eighth transistor T8 and a capacitor C1. The seventh transistor T7 includes: a first end coupled to the first node N1, a second end coupled to the third node N3, and a control end receiving the light control signal EM(n); the eighth transistor includes: a first end coupled to the second reference voltage Vref2, a second end coupled to the third node N3, and a control end receiving a compensation control signal VC(n); the capacitor includes a first end coupled to the third node N3, and a second end coupled to the second node N2.

Therefore, the operation details of the micro-luminescent diode pixel circuit 500 can be referred to the micro-luminescent diode pixel circuit 100, which will not be repeated here.

FIG. 6A shows a micro-luminescent diode pixel circuit according to an embodiment of the present invention. FIG. 6B shows a signal waveform diagram of the micro-luminescent diode pixel circuit according to an embodiment of the present invention. The micro-luminescent diode pixel circuit 600 includes: a luminescent circuit 610, a first voltage reading circuit 620, a reset circuit 630, a data reading circuit 640 and a second voltage reading circuit 650. Basically, the circuit architecture of the micro-LED pixel circuit 600 is similar to that of the micro-LED pixel circuit 100, except that the micro-LED pixel circuit 100 requires a compensation control signal VC(n) for reset, but in FIG. 6A , the micro-LED pixel circuit 600 does not require a compensation control signal VC(n) for reset. In addition, the control end of the eighth transistor T8 of the second voltage reading circuit 650 receives the n-1th stage serial control signal SN(n-1) instead of receiving the compensation control signal VC(n).

The light-emitting circuit 610 includes: a first transistor T1, a second transistor T2, a fourth transistor T4 and a micro-luminescent diode 111; the first transistor T1 includes: a first terminal coupled to an operating voltage Vdd, a second terminal coupled to a first node N1, and a control terminal receiving a light-emitting control signal EM(n). The second transistor T2 includes: a first end coupled to the first node N1, a second end coupled to the first end of the fourth transistor T4, and a control end coupled to the second node N2; the fourth transistor T4 includes: a first end coupled to the second end of the second transistor T2, a second end coupled to the first end of the micro-light-emitting diode 111, and a control end receiving the light-emitting control signal EM(n); the micro-light-emitting diode 111 includes a first end coupled to the second end of the fourth transistor T4, and a second end grounded.

The first voltage reading circuit 620 includes: a third transistor T3, the third transistor T3 includes: a first end coupled to the second end of the second transistor T2, a second end coupled to the second node N2, and a control end receiving an n-th level serial control signal SN(n).

The reset circuit 630 includes: a fifth transistor T5, the fifth transistor T5 includes: a first end coupled to the second node N2, a second end coupled to a first reference voltage Vref1, and a control end receiving an n-1th level serial control signal SN(n-1).

The data read circuit 640 includes: a sixth transistor T6, the sixth transistor T6 includes: a first end coupled to the first node N1, a second end receiving the data signal Data, and a control end receiving the n-th level serial control signal SN(n).

The second voltage reading circuit 650 includes: a seventh transistor T7, an eighth transistor T8, a ninth transistor T9 and a capacitor C1. The seventh transistor T7 includes: a first terminal coupled to the first node N1, a second terminal coupled to the third node N3, and a control terminal receiving the light control signal EM(n); the eighth transistor T8 includes: a first terminal coupled to the second reference voltage Vref2, a second terminal coupled to the third node N3, and a control terminal receiving the light control signal EM(n). to the third node N3, and a control terminal receiving the n-1th level serial control signal SN(n-1); the ninth transistor T9 includes: a first terminal coupled to the second reference voltage Vref2, a second terminal coupled to the third node N3, and a control terminal receiving the nth level serial control signal SN(n); the capacitor C1 includes a first terminal coupled to the third node N3, and a second terminal coupled to the second node N2.

Compared to the micro-LED pixel circuit 100 in FIG. 1, the micro-LED pixel circuit 600 only requires three control signals (luminous control signal EM(n), n-1th level serial control signal SN(n-1), nth level serial control signal SN(n)), and removes the compensation control signal VC(n).

In addition, the operation details of the micro-luminescent diode pixel circuit 600 can refer to the micro-luminescent diode pixel circuit 100, which will not be repeated here.

FIG. 7 shows a schematic diagram of a micro-luminescent diode display panel according to an embodiment of the present invention. As shown in FIG. 7, the micro-luminescent diode display panel 700 includes a plurality of micro-luminescent diode pixel circuits 710 arranged in a matrix. The micro-luminescent diode pixel circuit 710 can be the micro-luminescent diode pixel circuit 100 (FIG. 1), or the micro-luminescent diode pixel circuit 500 (FIG. 5A), or the micro-luminescent diode pixel circuit 600 (FIG. 6A).

From the above three embodiments, it can be seen that in the three embodiments of this case, the critical voltage compensation effect is better and the voltage drop caused by the micro LED current can be compensated better. And because the circuit structure of the pixel circuit of the three embodiments of this case can be simplified, the circuit area required by the pixel circuit of the three embodiments of this case is also smaller.

In summary, although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Those with common knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined in the attached patent application.

100: Micro-luminescent diode pixel circuit

110: Luminescent circuit

120: First voltage reading circuit

130: Reset circuit

140: Data reading circuit

150: Second voltage reading circuit

T1~T8: Transistor

C1: Capacitor

N1~N3: Node

EM(n), SN(n), SN(n-1), VC(n): control signal

Data: data signal

Vss: Ground

Vdd: operating voltage

Vref1, Vref2: reference voltage

Claims (10)

A micro-luminescent diode pixel circuit includes: a light-emitting circuit for emitting light; a first voltage reading circuit coupled to the light-emitting circuit, the first voltage reading circuit reading a critical voltage; a reset circuit coupled to the light-emitting circuit for resetting a voltage of a second node; a data reading circuit coupled to the light-emitting circuit for writing a data signal into the micro-luminescent diode pixel circuit; and a second voltage reading circuit coupled to the light-emitting circuit, the second voltage reading circuit writing a second reference voltage to a third node. A micro-luminescent diode pixel circuit as described in claim 1, wherein the luminescent circuit comprises: a first transistor, a second transistor, a fourth transistor and a micro-luminescent diode; the first transistor comprises: a first terminal coupled to an operating voltage, a second terminal coupled to a first node, and a control terminal receiving a luminescence control signal; the second transistor comprises: a first terminal coupled to the first node, a second terminal coupled to the fourth transistor, and a control terminal coupled to the second node; The fourth transistor includes: a first end coupled to the second transistor, a second end coupled to the micro-light emitting diode, and a control end receiving the light emitting control signal; the micro-light emitting diode includes a first end coupled to the fourth transistor, and a second end grounded; The first voltage reading circuit includes: a third transistor, the third transistor includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node, and a control end receiving an n-th series control signal, n is a positive integer; the reset circuit includes: a fifth transistor, the fifth transistor includes: a first end coupled to the second node, a second end coupled to a first reference voltage, and a control end receiving an n-1th level serial control signal; the data reading circuit includes: a sixth transistor, the sixth transistor includes: a first end coupled to the first node, a second end receiving the data signal, and a control end receiving the nth level serial control signal; and the second voltage reading The circuit includes: a seventh transistor, an eighth transistor and a capacitor. The seventh transistor includes: a first end coupled to the first node, a second end coupled to the third node, and a control end receiving the light control signal; the eighth transistor includes: a first end coupled to the second reference voltage, a second end coupled to the third node, and a control end receiving a compensation control signal; the capacitor includes a first end coupled to the third node, and a second end coupled to the second node. A micro-luminescent diode pixel circuit as described in claim 2, wherein, in a reset phase, the compensation control signal and the n-1th level serial control signal make the eighth transistor and the fifth transistor conductive, pull the voltage of the second node to the first reference voltage and the voltage of the third node to the second reference voltage, and pre-turn on the second transistor; In a voltage reading and data writing phase, the compensation control signal and the n-1th level serial control signal make the eighth transistor, the second transistor, the third transistor and the sixth transistor conductive. The data signal is turned on, the data signal is written to the first node, the voltage of the third node is pulled to the second reference voltage, the data signal is written to the second node through the sixth transistor, the second transistor and the third transistor, and the voltage of the second node is clamped at Data-|VTH|, Data is the data signal, and VTH is the critical voltage of the second transistor; and in a light-emitting phase, the light-emitting control signal makes the first transistor, the second transistor, the fourth transistor and the seventh transistor turned on, so that the micro-luminescent diode emits light. A micro-luminescent diode pixel circuit as described in claim 1, wherein the luminescent circuit comprises: a first transistor, a second transistor, a fourth transistor and a micro-luminescent diode; the first transistor comprises: a first end coupled to an operating voltage, a second end coupled to a first node, and a control end receiving a luminescent control signal; the second transistor comprises: a first end coupled to the first node, a second end coupled to the fourth transistor, and a control end coupled to the second node The fourth transistor includes: a first end coupled to the second transistor, a second end coupled to the micro-light emitting diode, and a control end receiving the light emitting control signal; the micro-light emitting diode includes a first end coupled to the fourth transistor, and a second end grounded; the first voltage reading circuit includes: a third transistor, the third transistor includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node, and a control end receiving an n+ 1st level serial control signal; the reset circuit includes: a fifth transistor, the fifth transistor includes: a first end coupled to the second node, a second end coupled to a first reference voltage, and a control end receiving an nth level serial control signal; the data reading circuit includes: a sixth transistor, the sixth transistor includes: a first end coupled to the first node, a second end receiving the data signal, and a control end receiving the n+1th level serial control signal; and the second voltage reading The circuit includes: a seventh transistor, an eighth transistor and a capacitor. The seventh transistor includes: a first end coupled to the first node, a second end coupled to the third node, and a control end receiving the light control signal; the eighth transistor includes: a first end coupled to the second reference voltage, a second end coupled to the third node, and a control end receiving a compensation control signal; the capacitor includes a first end coupled to the third node, and a second end coupled to the second node. A micro-luminescent diode pixel circuit as described in claim 1, wherein the luminescent circuit comprises: a first transistor, a second transistor, a fourth transistor and a micro-luminescent diode; the first transistor comprises: a first end coupled to an operating voltage, a second end coupled to a first node, and a control end receiving a luminescence control signal; the second transistor comprises: a first end coupled to the first node, a second end coupled to the fourth transistor, and a control end coupled to the second node; the fourth transistor comprises: a first end coupled to to the second transistor, a second end coupled to the micro-luminescent diode, and a control end receiving the luminescent control signal; the micro-luminescent diode includes a first end coupled to the fourth transistor, and a second end grounded; the first voltage reading circuit includes: a third transistor, the third transistor includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node, and a control end receiving an n-th level serial control signal; the reset circuit includes: a fifth transistor, the fifth transistor includes: a A first terminal is coupled to the second node, a second terminal is coupled to a first reference voltage, and a control terminal receives an n-1-th level serial control signal; the data reading circuit includes: a sixth transistor, the sixth transistor includes: a first terminal is coupled to the first node, a second terminal receives the data signal, and a control terminal receives the n-th level serial control signal; and the second voltage reading circuit includes: a seventh transistor, an eighth transistor, a ninth transistor and a capacitor, the seventh transistor includes: a first terminal is coupled to the first node, A second terminal is coupled to the third node, and a control terminal receives the light control signal; the eighth transistor includes: a first terminal coupled to the second reference voltage, a second terminal coupled to the third node, and a control terminal receives the n-1th level series control signal; the ninth transistor includes: a first terminal coupled to the second reference voltage, a second terminal coupled to the third node, and a control terminal receives the nth level series control signal; the capacitor includes a first terminal coupled to the third node, and a second terminal coupled to the second node. A micro-luminescent diode display panel includes: A plurality of micro-luminescent diode pixel circuits, each of which includes: a light-emitting circuit for emitting light; a first voltage reading circuit coupled to the light-emitting circuit, the first voltage reading circuit reading a critical voltage; a reset circuit coupled to the light-emitting circuit for resetting a voltage of a second node; a data reading circuit coupled to the light-emitting circuit for writing a data signal into the micro-luminescent diode pixel circuit; and a second voltage reading circuit coupled to the light-emitting circuit, the second voltage reading circuit writing a second reference voltage to a third node. A micro-luminescent diode display panel as described in claim 6, wherein the light-emitting circuit comprises: a first transistor, a second transistor, a fourth transistor and a micro-luminescent diode; the first transistor comprises: a first terminal coupled to an operating voltage, a second terminal coupled to a first node, and a control terminal receiving a light-emitting control signal; the second transistor comprises: a first terminal coupled to the first node, a second terminal coupled to the fourth transistor, and a control terminal coupled to the second node; The fourth transistor includes: a first end coupled to the second transistor, a second end coupled to the micro-light emitting diode, and a control end receiving the light emitting control signal; the micro-light emitting diode includes a first end coupled to the fourth transistor, and a second end grounded; The first voltage reading circuit includes: a third transistor, the third transistor includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node, and a control end receiving an n-th series control signal, n is a positive integer; the reset circuit includes: a fifth transistor, the fifth transistor includes: a first end coupled to the second node, a second end coupled to a first reference voltage, and a control end receiving an n-1th level serial control signal; the data reading circuit includes: a sixth transistor, the sixth transistor includes: a first end coupled to the first node, a second end receiving the data signal, and a control end receiving the nth level serial control signal; and the second voltage reading The circuit includes: a seventh transistor, an eighth transistor and a capacitor. The seventh transistor includes: a first end coupled to the first node, a second end coupled to the third node, and a control end receiving the light control signal; the eighth transistor includes: a first end coupled to the second reference voltage, a second end coupled to the third node, and a control end receiving a compensation control signal; the capacitor includes a first end coupled to the third node, and a second end coupled to the second node. A micro-luminescent diode display panel as described in claim 7, wherein, in a reset phase, the compensation control signal and the n-1th level serial control signal make the eighth transistor and the fifth transistor conductive, pull the voltage of the second node to the first reference voltage and the voltage of the third node to the second reference voltage, and pre-turn on the second transistor; In a voltage reading and data writing phase, the compensation control signal and the n-1th level serial control signal make the eighth transistor, the second transistor, the third transistor and the sixth transistor conductive. The data signal is turned on, the data signal is written to the first node, the voltage of the third node is pulled to the second reference voltage, the data signal is written to the second node through the sixth transistor, the second transistor and the third transistor, and the voltage of the second node is clamped at Data-|VTH|, Data is the data signal, and VTH is the critical voltage of the second transistor; and in a light-emitting phase, the light-emitting control signal makes the first transistor, the second transistor, the fourth transistor and the seventh transistor turned on, so that the micro-luminescent diode emits light. A micro-luminescent diode display panel as described in claim 6, wherein the luminescent circuit includes: a first transistor, a second transistor, a fourth transistor and a micro-luminescent diode; the first transistor includes: a first end coupled to an operating voltage, a second end coupled to a first node, and a control end receiving a luminescent control signal; the second transistor includes: a first end coupled to the first node, a second end coupled to the fourth transistor, and a control end coupled to the second node The fourth transistor includes: a first end coupled to the second transistor, a second end coupled to the micro-light emitting diode, and a control end receiving the light emitting control signal; the micro-light emitting diode includes a first end coupled to the fourth transistor, and a second end grounded; the first voltage reading circuit includes: a third transistor, the third transistor includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node, and a control end receiving an n+ 1st level serial control signal; the reset circuit includes: a fifth transistor, the fifth transistor includes: a first end coupled to the second node, a second end coupled to a first reference voltage, and a control end receiving an nth level serial control signal; the data reading circuit includes: a sixth transistor, the sixth transistor includes: a first end coupled to the first node, a second end receiving the data signal, and a control end receiving the n+1th level serial control signal; and the second voltage reading The circuit includes: a seventh transistor, an eighth transistor and a capacitor. The seventh transistor includes: a first end coupled to the first node, a second end coupled to the third node, and a control end receiving the light control signal; the eighth transistor includes: a first end coupled to the second reference voltage, a second end coupled to the third node, and a control end receiving a compensation control signal; the capacitor includes a first end coupled to the third node, and a second end coupled to the second node. A micro-luminescent diode display panel as described in claim 6, wherein the luminescent circuit comprises: a first transistor, a second transistor, a fourth transistor and a micro-luminescent diode; the first transistor comprises: a first end coupled to an operating voltage, a second end coupled to a first node, and a control end receiving a luminescent control signal; the second transistor comprises: a first end coupled to the first node, a second end coupled to the fourth transistor, and a control end coupled to the second node; the fourth transistor comprises: a first end coupled to to the second transistor, a second end coupled to the micro-luminescent diode, and a control end receiving the luminescent control signal; the micro-luminescent diode includes a first end coupled to the fourth transistor, and a second end grounded; the first voltage reading circuit includes: a third transistor, the third transistor includes: a first end coupled to the second end of the second transistor, a second end coupled to the second node, and a control end receiving an n-th level serial control signal; the reset circuit includes: a fifth transistor, the fifth transistor includes: a A first terminal is coupled to the second node, a second terminal is coupled to a first reference voltage, and a control terminal receives an n-1-th level serial control signal; the data reading circuit includes: a sixth transistor, the sixth transistor includes: a first terminal is coupled to the first node, a second terminal receives the data signal, and a control terminal receives the n-th level serial control signal; and the second voltage reading circuit includes: a seventh transistor, an eighth transistor, a ninth transistor and a capacitor, the seventh transistor includes: a first terminal is coupled to the first node, A second terminal is coupled to the third node, and a control terminal receives the light control signal; the eighth transistor includes: a first terminal coupled to the second reference voltage, a second terminal coupled to the third node, and a control terminal receives the n-1th level series control signal; the ninth transistor includes: a first terminal coupled to the second reference voltage, a second terminal coupled to the third node, and a control terminal receives the nth level series control signal; the capacitor includes a first terminal coupled to the third node, and a second terminal coupled to the second node.

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