WO2020181593A1

WO2020181593A1 - Pixel drive circuit of display unit, and driving method therefor

Info

Publication number: WO2020181593A1
Application number: PCT/CN2019/080767
Authority: WO
Inventors: 陈小龙; 吴嘉濂; 温亦谦
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-03-13
Filing date: 2019-04-01
Publication date: 2020-09-17
Also published as: CN109994085A

Abstract

A pixel drive circuit of a display unit, and a driving method therefor. The pixel drive circuit comprises: one or more gate drivers, one or more source drivers, and a time sequence controller. Each gate driver comprises a gate feedback line. Each source driver comprises a source feedback line. Source feedback lines receive gate output signals of gate lines transferred by gate feedback lines of pixel units in the same row. The source drivers are used for converting the gate output signal into a gate feedback signal, transferring same to the time sequence controller for calculating one delay time, and adjusting the charging time of pixel units corresponding to the source drivers in one period. The beneficial effect of minimizing the difference in the charging time of the pixel units is achieved.

Description

Pixel driving circuit of display unit and driving method thereof

Technical field

The present disclosure relates to the field of display technology, in particular to a pixel driving circuit of a display unit and a driving method thereof.

Background technique

The liquid crystal display panel includes scan lines and data lines, the data lines are driven by a data driving module, and the scan lines are driven by a scan driving module. The existing large-size liquid crystal display panel 100, as shown in FIG. 1A, since the signal line from the gate driving device 10 to the two ends of the display panel 100 is longer than the signal line to the center of the display panel 100, the resistance difference will be As shown in Figure 1A, the pixel charging time T2 (the distance from the gate driving device 10 to the other end of the display panel 100) is much longer than the pixel charging time T1 (gate driving). The distance between the device 10 and the display panel 100), the pixel charging time T2 at the other end of the display panel 100 relative to the gate driving device 10 is significantly longer than the pixel charging time T1 at one end of the gate driving device 10 of the display panel, and the display panel 100 The uneven charging of each pixel unit will result in poor display effect of the display panel 100 and uneven display brightness.

And as the size and resolution of the display panel increase, as shown in Figure 1B, the gate time delay (RC Delay) will increase as the size of the display panel increases. The gate driving device 10 outputs a gate driving signal to the gate line. The gate drive signal will be delayed due to the gate RC load. Source driver 20A, The time at which the source driving signal is output by 20B and 20C is also delayed, so that the gate driving signal received by the pixel unit has different delay times. And as the resolution and refresh frequency of the display panel increase, the pixel charging time is relatively reduced. Gate time delay (RC Delay) will cause the pixel charging time T1, T2, and T3 of the pixel units in each area of the display panel to be inconsistent. The source driving device 20C that is the farthest from the gate driving device 10 corresponds to the maximum pixel charging time T3, which will cause the panel display brightness Uneven, severe color shift will result in the picture.

Therefore, it is necessary to provide a pixel driving circuit of a display unit and a driving method thereof to solve the problem of color shift of the screen caused by the inconsistent charging time of the pixels of the panel in the prior art.

technical problem

The gate time delay (RC Delay) of the existing display panel will cause the pixel charging time of the pixel units in each area of the display panel to be inconsistent, which will cause the technical defect of uneven display brightness of the panel.

Technical solutions

In order to solve the above technical problems, the present disclosure provides a pixel drive circuit of a display unit. The display unit includes a plurality of pixel units arranged in an array. Each column of pixel units is connected to a source line, and each row of pixel units is connected to a gate. Polar line connection, the pixel driving circuit includes: one or more gate drivers for outputting a gate output signal, and each gate driver includes a gate feedback circuit connected to each gate line of each row of pixel units One or more source drivers, each source driver includes a source feedback circuit, respectively connected to the corresponding gate feedback circuit of each row of pixel units and connected to each of the source drivers, each source feedback circuit receives each The gate output signal of each gate line transmitted by the gate feedback circuit, and each source driver is used to convert the gate output signal into a gate feedback signal; a timing controller is connected to each of the source drivers And receive the gate feedback signal from each source driver, and calculate a delay time according to the gate feedback signal, and output a source feedback signal to each source driver for adjusting the corresponding source driver A charging time of the pixel unit in a period; wherein the delay time calculated based on each of the gate feedback signals respectively responds to the distance from the pixel unit to the gate driver.

According to an embodiment described herein, the delay times corresponding to the source output signals are different from each other.

According to an embodiment described herein, the period is a horizontal scanning period.

According to an embodiment described herein, the charging time of the pixel units in each column is the same as each other.

According to an embodiment described herein, the delay time respectively corresponds to a distance from the source line to the gate driver.

In order to solve the above technical problems, the present disclosure also provides a pixel drive circuit for a display unit. The display unit includes a plurality of pixel units arranged in an array. Each column of pixel units is connected to a source line, and each row of pixel units is connected to a Gate line connection, the pixel drive circuit includes: one or more gate drivers for outputting a gate output signal, and each gate driver includes a gate feedback circuit connected to each gate of each row of pixel units Line; one or more source drivers, each source driver includes a source feedback circuit, respectively connected to each row of pixel unit corresponding to the gate feedback circuit and connected to each of the source drivers, each source feedback circuit receives Each gate output signal of each gate line transmitted by each gate feedback circuit, each source driver is used to convert the gate output signal into a gate feedback signal; a timing controller connected to each of the sources The driver also receives the gate feedback signal from each source driver, calculates a delay time according to the gate feedback signal, and outputs a source feedback signal to each source driver for adjusting the corresponding source driver The pixel unit is charged for a period of time.

In order to solve the above technical problems, the present disclosure provides another method for driving a pixel driving circuit of a display unit to drive a plurality of pixel units arranged in an array of a display unit. Each column of pixel units is connected to a source line, and each row The pixel unit is connected to a gate line, and the operation method includes: providing one or more gate drivers for outputting a gate output signal, wherein each gate driver includes a gate feedback line connected to each row of pixel units Provide one or more source drivers for receiving the gate output signal and converting the gate output signal into a gate feedback signal, wherein each source driver includes a source The electrode feedback circuit is respectively connected to the gate feedback circuit corresponding to each row of pixel units and connected to each of the source drivers, and each source feedback circuit receives the gate output signal of each gate line transmitted by each gate feedback circuit , Each source driver is used to convert the gate output signal into a gate feedback signal; and provide a timing controller, calculate a delay time according to the gate feedback signal, and output a source feedback signal to For each source driver, a charging time of the pixel unit corresponding to each source driver is adjusted according to the delay time.

Beneficial effect

The beneficial effect of the present disclosure is that the timing controller calculates the delay time between each source through the gate feedback signal of each source driver, and outputs the source feedback signal to each source driver to adjust the charging of each source. Time to compensate for the difference in the charging time of the pixels caused by the gate time delay, minimize the difference in the charging time of the pixel units corresponding to each source, and make the source feedback signals output by different source drivers in the same row of pixel units be in one There are different delay times in the horizontal scanning period in order to reduce the difference in the charging time between the pixel units.

Description of the drawings

1A and 1B are schematic diagrams showing that the charging time of each pixel unit of the display panel is not consistent.

FIG. 2 is a circuit block diagram of the disclosed pixel driving circuit.

FIG. 3 is a timing diagram of the application of the pixel driving circuit on the display panel of the disclosure.

FIG. 4 is a schematic flow chart of the driving method of the disclosed pixel driving circuit.

Embodiments of the invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments that the present disclosure can be implemented.

Please refer to FIG. 2, which is a circuit block diagram of the pixel driving circuit of the present disclosure. In an embodiment of the present disclosure, a pixel driving circuit of a display unit 200 is disclosed. The display unit 200 includes a plurality of arrays arranged Pixel units (not shown). Each column of pixel units is connected to a source line, and each row of pixel units is connected to a gate line. The pixel driving circuit includes: one or more gate drivers 210 for outputting a Gate output signal. Each gate driver 210 includes a gate feedback line 211 connected to each gate line of each row of pixel units; one or more source drivers 220A, 220B, 220C, and each source driver 220A, 220B , 220C includes a source feedback circuit 221A, 221B, 221C, respectively connected to the gate feedback circuit 211 corresponding to each row of pixel units and connected to each of the source drivers 220A, 220B, 220C, each source feedback circuit 221A, 221B, 221C receive the gate output signal of each gate line transmitted by each gate feedback circuit 211, and each source driver 220 is used to convert the gate output signal into a gate feedback signal; a timing controller 300 , Connect each of the source drivers 220A, 220B, 220C and receive the gate feedback signal from each of the source drivers 220A, 220B, 220C, calculate a delay time according to the gate feedback signal, and output a The source feedback signal to each source driver 220A, 220B, 220C is used to adjust a charging time of the pixel unit corresponding to each source driver 220A, 220B, 220C in a period.

The display unit may, for example, include M rows and N columns of pixel units 101, where M and N are both positive integers. Each column of pixel units is connected to a source line (data line), and each row of pixel units is connected to a gate line (scanning line). In one embodiment, the charging time of the pixel units in each column is the same. The following will take the source drivers 220A, 220B, and 220C as examples for illustration. The rest of the source drivers can be deduced by referring to the relevant descriptions of the source drivers 220A, 220B, and 220C, so they will not be repeated.

The source drivers 220A, 220B, and 220C are coupled between the timing controller 300 and the display unit 200. The source drivers 220A, 220B, and 220C each include a source feedback circuit 221A, 221B, 221C and a plurality of driving circuits (not shown). These driving lines output multiple source feedback signals to multiple source lines of the display unit 200 in a one-to-one manner. For example, after the source drivers 220A, 220B, and 220C receive the horizontal scan signal provided by the timing controller 300, the horizontal scan signal is gradually shifted among these driving lines.

Similarly, the gate driver 210 is coupled between the timing controller 300 and the display unit 200. After the gate driver 210 receives the vertical scanning signal provided by the timing controller 300, the vertical scanning signal starts to move gradually in the display unit.

In this embodiment, the period is a horizontal scanning period. Therefore, the source drivers 220A, 220B, and 220C can drive each source line of the display unit 200 one by one according to the shift position of the horizontal scanning signal. . In accordance with the scanning timing of the source drivers 220A, 220B, and 220C, these source feedback signals can be written into multiple pixel units of the display unit 200 to display images.

The gate feedback line of each gate driver 210 is connected to each gate line of each row of pixel units, and each gate feedback line 211 feeds back the gate delay time (gate output signal) of each gate line to each gate driver 210. The source feedback lines 221A, 221B, and 221C of the source drivers 220A, 220B, and 220C are respectively connected to the gate feedback line 211 corresponding to each row of pixel units, and the source feedback lines 221A, 221B, and 221C are connected to each The source drivers 220A, 220B, and 220C. Therefore, each source feedback circuit 221A, 221B, 221C receives the gate output signal of each gate line transmitted by the gate feedback circuit 211, which means that the gate delay time of the gate line will also be fed back to each source driver 220A ,220B,220C. Each source driver 220A, 220B, 220C converts the gate output signal into a gate feedback signal and transmits it to the timing controller 300.

The timing controller 300 can control each of the source drivers 220A, 220B, and 220C based on the gate feedback signal to change the delay time of the source feedback signal in one horizontal scanning period. That is, the timing controller 300 outputs the source feedback signal to each source driver 220A, 220B, 220C to adjust the charging time of the pixel unit corresponding to each source driver 220A, 220B, 220C in a period, so each of the source feedback The delay time corresponding to the signal is different from each other. Wherein, the delay time of the source feedback signals respectively responds to the distance from the source lines to the gate driver 210. The longer the distance, the longer the delay time, thereby compensating for the gate delay time of the output signal of each gate line, and minimizing the difference in the charging time of the pixel unit corresponding to each source.

For example, FIG. 3 is a timing diagram of the pixel driving circuit applied to the display panel. 3 and FIG. 2, the gate driver 210 outputs a gate driving signal to the gate line. The gate drive signal will be delayed due to the gate RC load. Therefore, the gate drive signal received by the pixel unit has different delay times. The delay time of the gate driving signal is in response to the distance from the pixel unit to the gate driver. As the size of the display unit increases, the delay effect of the gate line will be more obvious. The delay effect is the most serious at the position farthest from the gate driver 210.

The gate feedback circuit 211 and the source feedback circuits 221A, 221B, and 221C can control the time point at which the source is driven by collecting gate output signals, and change the source drivers 220A by outputting source feedback signals. The delay time for each pixel unit corresponding to 220B and 220C to charge in one horizontal scanning period.

The delay times of these source feedback signals are respectively in response to the distances from the source lines to the gate driver 210. The longer the distance, the greater the delay time. In other words, the delay times of these source feedback signals are different from each other. For example (but not limited to this), the delay time of the source feedback signal transmitted from each source drive line to the source line can be set to be different from each other, but these source drivers 220A, 220B, and 220C will correspond to each other. The charging time Td1, Td2, Td3 of each pixel unit tends to be the same.

For the same gate line, the charging time of one pixel unit is Td1, the charging time of another pixel unit is Td2, and the charging time of another pixel unit is Td3. As can be seen from Figure 3, since the source drive signals output by different source drive circuits have different delay times during the horizontal scanning period, the difference in charging time between each pixel unit can be minimized, which can improve each pixel unit. The problem of inconsistency between the charging time.

In the above embodiment, the different source feedback signals output by the source driving circuits have different delay times. In any case, the embodiments of the present invention are not limited to this. That is, the delay times of these source feedback signals are respectively in response to the distance from the source line to the gate driver. The longer the distance, the greater the delay time.

Please continue to refer to FIG. 4, which is a schematic flowchart of the driving method of the pixel driving circuit of the present disclosure. A method for driving a pixel drive circuit of a display unit to drive a plurality of pixel units arranged in an array of a display unit, each column of pixel units is connected to a source line, and each row of pixel units is connected to a gate line, so The operation method includes: Step S01: providing one or more gate drivers for outputting a gate output signal, wherein each gate driver includes a gate feedback circuit connected to each gate line of each row of pixel units; Step S02: Provide one or more source drivers for receiving the gate output signal and converting the gate output signal into a gate feedback signal, wherein each source driver includes a source feedback circuit, The gate feedback lines corresponding to each row of pixel units are respectively connected to each of the source drivers, and each source feedback line receives the gate output signal of each gate line transmitted by each gate feedback line, and each source The driver is used to convert the gate output signal into a gate feedback signal; and step S03: provide a timing controller, calculate a delay time according to the gate feedback signal, and output a source feedback signal to each The source driver enables a charging time of the pixel unit corresponding to each source driver to be adjusted according to the delay time.

In some embodiments, the delay times corresponding to the source output signals are different from each other. In other embodiments, the period is a horizontal scanning period. And in some embodiments, the charging time of the pixel units in each column is the same.

In some embodiments, the delay time respectively corresponds to a distance from the source line to the gate driver, that is, the delay time of the source feedback signals issued by the timing controller is respectively in response to the source The distance from the line to the gate driver.

The present disclosure provides a pixel driving circuit of a display unit and a driving method thereof. The timing controller calculates the delay time between each source through the gate feedback signal of each source driver, and outputs the source feedback signal to each source The electrode driver adjusts the charging time of each source to compensate for the difference in the charging time of the pixel caused by the gate time delay, minimizes the difference in the charging time of the pixel unit corresponding to each source, and makes different sources in the same row of pixel units The source feedback signal output by the driver has different delay times in one horizontal scanning period, so as to reduce the difference in the charging time between the pixel units.

The above are the preferred embodiments of the present disclosure. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present disclosure, several improvements and modifications can be made, and these improvements and modifications are also considered The scope of protection of this disclosure.

Claims

A pixel drive circuit of a display unit. The display unit includes a plurality of pixel units arranged in an array. Each column of pixel units is connected to a source line, and each row of pixel units is connected to a gate line. The pixel drive circuit include:

One or more gate drivers for outputting a gate output signal, each gate driver includes a gate feedback line connected to each gate line of each row of pixel units;

One or more source drivers, each source driver includes a source feedback circuit, respectively connected to the gate feedback circuit corresponding to each row of pixel units and connected to each of the source drivers, each source feedback circuit receives each gate The gate output signal of each gate line transmitted by the pole feedback circuit, and each source driver is used to convert the gate output signal into a gate feedback signal;

A timing controller is connected to each of the source drivers and receives the gate feedback signal from each source driver, calculates a delay time according to the gate feedback signal, and outputs a source feedback signal to each The source driver is used to adjust a charging time of the pixel unit corresponding to each source driver in a period;

Wherein, the delay time calculated based on each of the gate feedback signals respectively responds to the distance from the pixel unit to the gate driver.
4. The pixel driving circuit of the display unit according to claim 1, wherein the delay times corresponding to the source output signals are different from each other.
4. The pixel driving circuit of the display unit according to claim 1, wherein the period is a horizontal scanning period.
The pixel driving circuit of the display unit according to claim 1, wherein the charging time of the pixel units in each column is the same as each other.
4. The pixel driving circuit of the display unit according to claim 1, wherein the delay time respectively corresponds to a distance from the source line to the gate driver.
A pixel drive circuit of a display unit. The display unit includes a plurality of pixel units arranged in an array. Each column of pixel units is connected to a source line, and each row of pixel units is connected to a gate line. The pixel drive circuit include:

One or more gate drivers for outputting a gate output signal, each gate driver includes a gate feedback line connected to each gate line of each row of pixel units;

One or more source drivers, each source driver includes a source feedback circuit, respectively connected to the gate feedback circuit corresponding to each row of pixel units and connected to each of the source drivers, each source feedback circuit receives each gate The gate output signal of each gate line transmitted by the pole feedback circuit, and each source driver is used to convert the gate output signal into a gate feedback signal;

A timing controller is connected to each of the source drivers and receives the gate feedback signal from each source driver, calculates a delay time according to the gate feedback signal, and outputs a source feedback signal to each The source driver is used to adjust a charging time of the pixel unit corresponding to each source driver in a period.
7. The pixel driving circuit of the display unit according to claim 6, wherein the delay times corresponding to the source output signals are different from each other.
7. The pixel driving circuit of the display unit according to claim 6, wherein the period is a horizontal scanning period.
7. The pixel driving circuit of the display unit according to claim 6, wherein the charging time of the pixel units in each column is the same.
7. The pixel driving circuit of the display unit according to claim 6, wherein the delay time respectively corresponds to a distance from the source line to the gate driver.
A method for driving a pixel drive circuit of a display unit to drive a plurality of pixel units arranged in an array of a display unit, each column of pixel units is connected to a source line, and each row of pixel units is connected to a gate line, so The operation methods include:

One or more gate drivers are provided for outputting a gate output signal, wherein each gate driver includes a gate feedback circuit connected to each gate line of each row of pixel units;

One or more source drivers are provided for receiving the gate output signal and converting the gate output signal into a gate feedback signal, wherein each source driver includes a source feedback circuit connected to each The gate feedback circuit corresponding to a row of pixel units is connected to each of the source drivers, each source feedback circuit receives the gate output signal of each gate line transmitted by each gate feedback circuit, and each source driver is used for Converting the gate output signal into a gate feedback signal; and

Provide a timing controller, calculate a delay time according to the gate feedback signal, and output a source feedback signal to each source driver, so that a charging time of the pixel unit corresponding to each source driver is based on the delay time Be adjusted.
11. The driving method of the pixel driving circuit of the display unit according to claim 11, wherein the delay times corresponding to the source output signals are different from each other.
11. The driving method of the pixel driving circuit of the display unit according to claim 11, wherein the period is a horizontal scanning period.
11. The driving method of the pixel driving circuit of the display unit according to claim 11, wherein the charging time of the pixel units in each column is the same.
11. The driving method of the pixel driving circuit of the display unit according to claim 11, wherein the delay time respectively corresponds to a distance from the source line to the gate driver.