CN116469352A

CN116469352A - Brightness compensation method, driving circuit of display panel and display panel

Info

Publication number: CN116469352A
Application number: CN202310424549.2A
Authority: CN
Inventors: 李建雷; 陈伟; 纪飞林; 胡云川; 陶治橙; 叶利丹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-07-21

Abstract

The application discloses a brightness compensation method, a driving circuit of a display panel and the display panel, and belongs to the technical field of display. The brightness compensation method comprises the following steps: acquiring a data enabling signal, and determining the refresh rate of a current frame according to the data enabling signal; comparing the refresh rate of the current frame with a preset refresh rate threshold to obtain a comparison result, and determining a gamma set value according to the comparison result; and carrying out brightness compensation on the next frame of display picture according to the gamma set value. According to the method and the device, the refresh rate is identified, the corresponding gamma set value is configured for the refresh rate, and then the charging voltage of each pixel in the display screen is adjusted, so that the technical problem that the display screen flickers due to brightness difference when being switched between different refresh rates is solved.

Description

Brightness compensation method, driving circuit of display panel and display panel

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a brightness compensation method, a driving circuit of a display panel, and a display panel.

Background

The Freesync technology requires that the display device can implement a variable frequency function, so that the frequency of the screen display picture can be automatically matched with the frequency of the picture output by the display card. For a display device with a freeync technology, the charging time of each frame with a high refresh rate and a low refresh rate is the same, and the difference is that the blank period between the two frames is different, if the display device is switched back and forth with the high refresh rate and the low refresh rate in a short time according to a certain rule, the brightness difference between the different refresh rates can cause the problem of flicker of the display screen.

Disclosure of Invention

The main objective of the present application is to provide a brightness compensation method, a driving circuit of a display panel, and a display panel, which aim to solve the technical problem that a display screen flicker when switching between different refresh rates.

To achieve the above object, the present application provides a brightness compensation method, including:

acquiring a data enabling signal, and determining the refresh rate of a current frame according to the data enabling signal;

comparing the refresh rate of the current frame with a preset refresh rate threshold to obtain a comparison result, and determining a gamma set value according to the comparison result;

and carrying out brightness compensation on the next frame of display picture according to the gamma set value.

Optionally, the step of determining the refresh rate of the current frame according to the data enable signal includes:

determining a display period of a current frame and a frame starting node of a next frame according to the data enabling signal;

determining a blank period of the current frame according to the display period and the frame starting node;

and determining the refresh rate of the current frame according to the display period and the blank period.

Optionally, the preset refresh rate threshold includes: a first threshold, a second threshold, and a third threshold, the first threshold being greater than the second threshold, the second threshold being greater than the third threshold; the gamma set value includes: a first set point and a second set point, the first set point being less than the second set point;

the step of comparing the refresh rate of the current frame with a preset refresh rate threshold to obtain a comparison result, and determining a gamma set value according to the comparison result comprises the following steps:

comparing the refresh rate of the current frame with the first threshold, the second threshold and the third threshold to obtain a comparison result;

determining a gamma set value as the first set value under the condition that the comparison result is that the refresh rate of the current frame is smaller than the first threshold value and not smaller than the second threshold value;

and determining a gamma set value as the second set value under the condition that the comparison result is that the refresh rate of the current frame is smaller than the second threshold value and not smaller than the third threshold value.

Optionally, the step of performing brightness compensation on the next frame of display screen according to the gamma set value includes:

determining a gray scale voltage based on the gamma set value;

and charging each pixel in the next frame of display picture based on the gray scale voltage to complete brightness compensation.

Optionally, the step of determining the gray scale voltage based on the gamma set value includes:

determining a gamma voltage based on the gamma set point;

a gray scale voltage is generated based on the gamma voltage.

Optionally, before the step of performing brightness compensation on the display screen of the next frame according to the gamma set value, the brightness compensation method further includes:

determining a preset gray-scale voltage based on a preset gamma voltage under the condition that a frame start node of a next frame in the data enabling signal is determined;

and charging the first row of pixels in the next frame of display picture based on the preset gray-scale voltage.

sequentially determining a plurality of groups of gamma voltages based on the gamma set values;

sequentially adjusting the preset gray scale voltages based on the plurality of groups of gamma voltages to obtain a plurality of groups of compensation gray scale voltages;

and charging a plurality of rows of pixels in the next frame of display picture in sequence based on the plurality of groups of compensation gray scale voltages so as to complete brightness compensation.

Optionally, the plurality of sets of gamma voltages includes: a first gamma voltage, a second gamma voltage, and a third gamma voltage; the plurality of groups of compensation gray scale voltages include: the device comprises a first compensation gray scale voltage, a second compensation gray scale voltage and a third compensation gray scale voltage, wherein the first compensation gray scale voltage is smaller than the second compensation gray scale voltage, and the second compensation gray scale voltage is smaller than the third compensation gray scale voltage;

the step of sequentially adjusting the preset gray scale voltages based on the plurality of groups of gamma voltages to obtain a plurality of groups of compensation gray scale voltages comprises the following steps:

adjusting the preset gray scale voltage based on the first gamma voltage to obtain the first compensation gray scale voltage;

adjusting the preset gray scale voltage based on the first gamma voltage and the second gamma voltage to obtain the second compensation gray scale voltage;

and adjusting the preset gray scale voltage based on the first gamma voltage, the second gamma voltage and the third gamma voltage to obtain the third compensation gray scale voltage.

In addition, to achieve the above object, the present application further provides a driving circuit of a display panel, the driving circuit of the display panel including: the display device comprises a time sequence control circuit, a gamma circuit and a data driving circuit, wherein the time sequence control circuit is connected with the gamma circuit and the data driving circuit, the gamma circuit is connected with the data driving circuit, the data driving circuit is connected with a display area of a display panel, and the driving circuit of the display panel is used for executing the brightness compensation method.

In addition, in order to achieve the above object, the present application further provides a display panel, which includes a panel body and the driving circuit of the display panel as described above, the driving circuit of the display panel being disposed in the non-display area of the panel body.

In the brightness compensation method, firstly, a data enabling signal is obtained, the refresh rate of a current frame is determined according to the data enabling signal, after the refresh rate of the current frame is determined, the refresh rate of the current frame and a preset refresh rate threshold value can be compared to obtain a comparison result, and further, a gamma set value is determined according to the comparison result, so that different refresh rates are configured with corresponding gamma set values, finally, brightness compensation is carried out on a next frame of display picture according to the gamma set value, when the different refresh rates are compensated, due to the difference of leakage loss caused by different blank periods of the different refresh rates, one frame of picture under different refresh rates can be maintained at similar brightness, and the technical problem that pictures flicker when the display screen is switched between the different refresh rates is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only a part of the embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flowchart of a brightness compensation method according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a driving circuit of a display panel according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of different frame lengths corresponding to different refresh rates according to a brightness compensation method according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of different compensation nodes corresponding to different refresh rates according to a brightness compensation method according to an embodiment of the present disclosure;

fig. 5 is a flowchart of a brightness compensation method according to another embodiment of the present disclosure;

fig. 6 is a flowchart of a brightness compensation method according to another embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present application.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				01	Time sequence control circuit	02	Gamma circuit
03	Data driving circuit	04	Display area of display panel
				05	Signal source	06	Power supply circuit
A	Active area of one frame	B	Blank region of 144HZ frame
				C	Blank region of 120HZ one frame	D	Blank region of 72HZ one frame
E	Blank region of 48HZ one frame	Z	One frame
				Z0	Frame starting node	Zb	Compensation node
100	Panel body	101	Non-display area of panel body

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the embodiments of the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the embodiments of the present application with unnecessary detail.

It should be noted that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different from that in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

It should also be appreciated that references to "one embodiment" or "some embodiments" or the like described in the specification of embodiments of the present application mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

Freesync is a Display frequency conversion technology, and is a technology for implementing a dynamic refresh rate by AMD (Advanced Micro Devices, inc., ultrawile semiconductor corporation) using industry standards such as Display Port (DP, a Display Port), adaptive synchronization, and the like. The dynamic refresh rate minimizes input delay and reduces or completely eliminates the problems of churning and tearing during game play and video play by synchronizing the refresh rate of a compatible display with the frame rate of a user's graphics card.

One frame of the display screen is divided into an Active area of display time and a Blank area of pause time before entering the next frame, and assuming that an FHD (48 Hz-240 Hz) display screen is taken as an example, the resolution is 1920 x 1080, the 1080 lines are required to be scanned and charged in total, then 45 lines are stopped, the 1080 line charging time is the Active area, the 45 line charging time is the Blank area, and the Fresync is to change the refresh rate by changing the line number of the charging time of the Blank area. For example, in the case where the refresh rate is 240Hz, the number of lines per frame, i.e., V Total, is 1125 lines, and if the Blank area is increased by 1125 lines, the number of lines per frame, i.e., V Total, becomes 2250 lines, and since the charging time per line is the same, the refresh rate is changed from 240Hz to 120 Hz.

The LCD (Liquid Crystal Display ) maintains brightness by maintaining a voltage difference across the liquid crystal after scanning and charging, but since the charged electricity is slowly lost, for example, the time length of one frame at two refresh rates of 240Hz and 48Hz is 5 times different, the leakage time length corresponding to the Blank area of the two refresh rates is also greatly different, so that a bright-dark change perceived by naked eyes occurs if the fresync is switched between refresh rates with great difference of the refresh rates.

Based on this, the embodiment of the application provides a brightness compensation method, a driving circuit of a display panel and a display panel, in the brightness compensation method, firstly, a data enabling signal is obtained, the refresh rate of a current frame is determined according to the data enabling signal, after the refresh rate of the current frame is determined, the refresh rate of the current frame and a preset refresh rate threshold value can be compared to obtain a comparison result, a gamma set value is determined according to the comparison result, further, different refresh rates are ensured to be configured with corresponding gamma set values, finally, brightness compensation is carried out on a next frame of display picture according to the gamma set value, when the different refresh rates are compensated, due to leakage loss difference caused by different blank periods of the different refresh rates, one frame of picture under the different refresh rates can be maintained at similar brightness, and the technical problem that picture flicker occurs when the display screen is switched between the different refresh rates is overcome.

The brightness compensation method, the driving circuit of the display panel and the display panel provided in the embodiments of the present application are specifically described through the following embodiments, and the brightness compensation method in the embodiments of the present application is described first.

Referring to fig. 1, fig. 1 is a schematic flow chart of a brightness compensation method according to an embodiment of the present application, where the brightness compensation method may be applied to a display panel, as shown in fig. 1, and the brightness compensation method according to the embodiment includes steps S10 to S30.

Step S10, acquiring a data enabling signal, and determining the refresh rate of the current frame according to the data enabling signal;

it should be noted that, the execution body in this embodiment is a driving circuit in the display panel, specifically, as can be seen in fig. 2, the driving circuit includes a timing control circuit TCON, a gamma circuit GM (gamma) and a data driving circuit Driver that are connected to each other, and the driving circuit further includes a signal source SOC connected to TCON, and a Power supply circuit Power for providing working Power for TCON, GM and Driver. In this embodiment, the data enable signal, i.e., the signal source SOC, is sent to the display data of the timing control circuit TCON.

As an example, in this embodiment, the flow of driving the display panel by the driving circuit is: the signal source SOC transmits Active area data from the first row to the TCON line by line, the TCON receives and processes the Active area data line by line, then the display data is sent to the Driver, the Driver receives and then carries out DAC (Digital-to-Analog Converter) to generate gray scale voltage, and then the gray scale power supply is sent to the in-plane display.

In some possible embodiments, the step of determining the refresh rate of the current frame according to the data enable signal in step S10 includes:

step S11, determining the display period of the current frame and the frame starting node of the next frame according to the data enabling signal;

step S12, determining a blank period of the current frame according to the display period and the frame starting node;

and step S13, determining the refresh rate of the current frame according to the display period and the blank period.

It should be noted that, in this embodiment, the data enable signal includes not only the display period of the current frame, that is, the number of charging time lines corresponding to the Active area data, but also the frame start node of the next frame, that is, the position of entering the Active area of the next frame. Therefore, after the Active area scanning of the current frame is finished, the period from the end of the Active area scanning of the current frame to the end of the Active area scanning of the next frame is the blank period of the current frame, and the display period and the blank period of the current frame are added to obtain the total charging time line number required to be scanned by the current frame, so that the refresh rate of the current frame is determined.

As an example, since the time span from receiving data to transmitting data of the TCON is several lines to several tens of lines (not more than 20 lines), the TCON will process the Active area data of the current frame first, then enter the Blank area of the current frame, and under the condition of reaching the frame start node of the next frame, the TCON can determine the charging time line number of the Blank area of the current frame, and further, the total charging time line number of the current frame is obtained by combining the charging time line number of the Active area, and the refresh rate of the current frame is obtained according to the corresponding relation between the preset charging time line number and the refresh rate.

As an example, as can be seen in conjunction with fig. 3, fig. 3 provides time spans of one frame corresponding to 4 different refresh rates 144HZ, 120HZ, 72HZ, and 48HZ, where a is an Active area of one frame, i.e. a progressive scan display time, and B, C, D, E corresponds to a Blank area of one frame at different refresh rates, i.e. a pause time at which progressive scan display ends, respectively, and two ends of the Blank area are a termination node of the Active area of the current frame and a frame start node Z0 of the next frame, respectively.

Step S20, comparing the refresh rate of the current frame with a preset refresh rate threshold to obtain a comparison result, and determining a gamma set value according to the comparison result;

it should be noted that in this embodiment, multiple sets of different preset refresh rate thresholds, for example, 144HZ, 120HZ, 72HZ and 48HZ, are set for the display panel, after the TCON determines the refresh rate of the current frame, the refresh rate thresholds may be compared with the preset refresh rate thresholds, so as to determine the gamma setting value to be adjusted, and based on the gamma setting value, the GM voltage of 14 (or 10 or 18) sets of GM output to the Driver is controlled by the I2C, so as to change the gray level voltage of the Driver output to the in-plane surface, thereby finally achieving the purpose of brightness compensation.

It can be understood that, since the Active areas are the same at different refresh rates, the longer the Blank area is, the more the leakage amount is, the larger the gray scale voltage variation amount is, and the larger the brightness difference is.

As an example, when the refresh rate is switched from 144Hz to 48Hz, the brightness of the display screen gradually decreases, so as the refresh rate decreases, the gray scale voltage needs to be increased, so that, as long as a higher charging voltage is applied to each pixel capacitor in the Active area under the low refresh rate, the brightness average value of the display screen can be kept consistent with the brightness in no leakage in the longer Blank area.

In some possible embodiments, the preset refresh rate threshold comprises: a first threshold, a second threshold, and a third threshold, the first threshold being greater than the second threshold, the second threshold being greater than the third threshold; the gamma set value includes: a first set point and a second set point, the first set point being less than the second set point; the step S20 includes:

step S21, comparing the refresh rate of the current frame with the first threshold, the second threshold and the third threshold to obtain a comparison result;

step S22, determining a gamma set value as the first set value under the condition that the comparison result is that the refresh rate of the current frame is smaller than the first threshold value and not smaller than the second threshold value;

step S23, determining a gamma setting value as the second setting value when the comparison result is that the refresh rate of the current frame is less than the second threshold and not less than the third threshold.

As an example, in this embodiment, the first threshold is 144HZ, the second threshold is 120HZ, the third threshold is 72HZ, the refresh rate of the current frame is 120HZ, the first setting value is 1, the second setting value is 2, and the gamma setting value is 1.

As an example, in this embodiment, the first threshold is 120HZ, the second threshold is 72HZ, the third threshold is 48HZ, the refresh rate of the current frame is 48HZ, the first setting value is 5, the second setting value is 10, and the gamma setting value is determined to be 10.

As an example, referring to fig. 4, as can be seen from the foregoing fig. 3, in fig. 4, a plurality of compensation nodes Zb corresponding to the gamma setting values are added in the Blank regions with different refresh rates, wherein a region B in a frame Z includes one compensation node Zb, a region C includes two compensation nodes Zb, a region D includes three compensation nodes Zb, and a region E includes six compensation nodes Zb; thus, when the refresh rate of the current frame is 144HZ, the gamma setting value corresponds to the first compensation node in the B region, when the refresh rate of the current frame is 120HZ, the gamma setting value corresponds to the second compensation node in the C region, when the refresh rate of the current frame is 72HZ, the gamma setting value corresponds to the third compensation node in the D region, and when the refresh rate of the current frame is 48HZ, the gamma setting value corresponds to the sixth compensation node in the E region.

And step S30, performing brightness compensation on the display picture of the next frame according to the gamma set value.

It should be noted that, when the TCON identifies the frame start node of the next frame, the TCON will perform Data processing on the Active area of the next frame and send the processed display Data to the Driver, meanwhile, after identifying the refresh rate of the current frame, the TCON will also determine the gamma set value corresponding to the refresh rate, and generate a gamma voltage adjustment command based on the gamma set value to send to the GM, the GM outputs a gamma voltage based on the gamma voltage adjustment command to the Driver, the Driver automatically divides the voltage through a resistor string to generate 256 x 2 (positive and negative gray) gray voltages, then determines positive and negative based on the POL (line inversion signal) given by the TCON, and the gray DAC determined by the Data is converted into a Data voltage to be sent to the in-plane display for brightness compensation of the display picture of the next frame. It can be understood that after the GM outputs the gamma voltage to the Driver, the Driver generates the gray voltage based on the gamma voltage from the GM and sends the gray voltage to the in-plane display, the brightness compensation of the next frame of display screen is considered to be completed.

The embodiment provides a brightness compensation method, a timing control and Data processing chip TCON in an LCD (liquid crystal display) is used for acquiring a Data enabling signal from a signal source SOC (system on chip), determining the refresh rate of a current frame according to the Data enabling signal, determining a gamma set value for compensating brightness variation of different refresh rates according to the refresh rate of the current frame and a preset refresh rate threshold value after determining the refresh rate of the current frame, generating a corresponding gamma voltage regulating instruction by the TCON based on the gamma set value and sending the gamma voltage regulating instruction to a gamma chip GM (mobile) so as to ensure that the gamma set value corresponding to the gamma set value is configured for different refresh rates, finally calling the GM chip to generate GM voltage to a Driver according to the gamma set value, automatically dividing the voltage to generate a gray-scale voltage by a resistor string, determining positive and negative based on POL given by the TCON, converting the gray-scale DAC (digital to Data) decided by the Data voltage to be sent to an in-plane display for brightness compensation of a display picture of a next frame. The embodiment configures different gamma setting values for compensation according to different refresh rates, and solves the technical problem that a display screen flickers when being switched between different refresh rates.

As can be seen from the above embodiments, when the TCON identifies the frame start node of the next frame, that is, the last line of the Blank area of the current frame, the TCON determines the gamma setting value and sends a gamma adjustment command to the GM, and at the same time, performs data processing on the Active area of the next frame and sends the processed display data to the Driver, where the two processes are performed almost simultaneously, but the processing times of the two processes are not the same. Recognizing the TCON to the last line of the Blank area, determining a gamma set value and generating a gamma adjustment instruction, transmitting the instruction to the GM, enabling the GM to take effect, marking the time for the rising and the ending of the rising of the effective voltage of the GM as T1, finishing the data processing, transmitting the data to Driver, driver and marking the time for the finishing of the data processing to start outputting the gray-scale voltage as T2, wherein the T1 is larger than T2, so that if the refresh rate of the current frame is just at the node of the preset refresh rate threshold value, a problem occurs, and because the GM starts to act on the last line of the V Blank of the current frame, the Active area of the next frame, namely the display area starts to take effect and ends, two split screen phenomena (the difference of the gray-scale voltage in the plane is generated by the Driver) which can appear before and after the GM takes effect (the charging is scanned downwards from top of the display screen).

Based on this, the embodiment of the present application further provides a brightness compensation method, based on the embodiment corresponding to fig. 1, referring to fig. 5, fig. 5 is a schematic flow chart of a brightness compensation method according to another embodiment of the present application, as shown in fig. 5, where step S30 includes:

step A31, determining gray scale voltage based on the gamma set value;

and step A32, charging each pixel in the next frame of display picture based on the gray scale voltage to complete brightness compensation.

In some possible embodiments, the step a31 includes:

step A311, determining a gamma voltage based on the gamma set value;

step a312, generating gray scale voltages based on the gamma voltages.

In this embodiment, the split screen phenomenon caused by the GM before and after the GM is effective is solved by decreasing T1 and increasing T2 so that T2 is greater than T1.

As an example, the manner of reducing T1 may be to increase the signal transmission rate from TCON to GM, i.e., the I2C transmission rate, and in combination with hardware improvement, the resistance in the I2C circuit may be replaced with a smaller resistance (e.g., a 1K ohm resistance); the manner of increasing T2 may be to increase a multi-stage Line Buffer (Line Buffer) Buffer in the TCON, so as to delay the time for starting data processing, where the delay time may be set according to requirements, for example, 50 lines, 100 lines, etc., as long as T2 is greater than T1.

It can be understood that after the T2 is greater than T1 based on the above scheme, the Driver will first receive the gamma voltage output by the GM based on the gamma set value, then receive the display data output by the TCON after finishing the data processing, and finally generate the gray scale voltage to the in-plane based on the gamma voltage for which the GM has finished compensating and the display output from the TCON, so that the situation that the Driver has started to output the gray scale voltage to the in-plane before the GM takes effect can be avoided, and further the split screen phenomenon caused by the gray scale voltage jump before and after the GM takes effect is avoided.

The embodiment provides a brightness compensation method, which shortens the time of T1 by improving an I2C circuit, prolongs the time of T2 by improving a TCON internal circuit, finally enables a Driver to output gray-scale voltage into a plane after GM takes effect, and avoids the split screen phenomenon caused by gray-scale voltage jump before and after GM takes effect.

Based on this, the embodiment of the present application further provides a brightness compensation method, based on the embodiment corresponding to fig. 1, referring to fig. 6, fig. 6 is a schematic flow chart of a brightness compensation method according to another embodiment of the present application, as shown in fig. 6, before the step S30, the brightness compensation method further includes:

and step B30, charging the first row of pixels in the display picture of the next frame based on the preset gray-scale voltage under the condition that the frame start node of the next frame in the data enabling signal is determined.

The step S30 includes:

step B31, sequentially determining a plurality of groups of gamma voltages based on the gamma set values;

step B32, adjusting the preset gray scale voltages in sequence based on the plurality of groups of gamma voltages to obtain a plurality of groups of compensation gray scale voltages;

and step B33, charging the plurality of rows of pixels in the next frame of display picture in turn based on the plurality of groups of compensation gray scale voltages to complete brightness compensation.

In some possible embodiments, the plurality of sets of gamma voltages includes: a first gamma voltage, a second gamma voltage, and a third gamma voltage; the plurality of groups of compensation gray scale voltages include: the device comprises a first compensation gray scale voltage, a second compensation gray scale voltage and a third compensation gray scale voltage, wherein the first compensation gray scale voltage is smaller than the second compensation gray scale voltage, and the second compensation gray scale voltage is smaller than the third compensation gray scale voltage; the step B32 includes:

step B321, adjusting the preset gray scale voltage based on the first gamma voltage to obtain the first compensation gray scale voltage;

step B322, adjusting the preset gray scale voltage based on the first gamma voltage and the second gamma voltage to obtain the second compensation gray scale voltage;

and step B323, adjusting the preset gray scale voltage based on the first gamma voltage, the second gamma voltage and the third gamma voltage to obtain the third compensation gray scale voltage.

In this embodiment, the I2C circuit and the TCON internal circuit are not improved, and under the condition that T1 is maintained to be greater than T2, the compensation Step of GM is reduced as much as possible, the difference between GM before and after the GM is effective is reduced, the GM is effective as gently as much as possible, and the split screen phenomenon is reduced to the extent that it cannot be perceived by naked eyes. It will be understood that, since T1 is greater than T2, before step S30, the Driver will first receive the display data sent by TCON, and after receiving the display data, generate a preset gray voltage based on the gamma voltage of the current frame and the display data to start charging the first row of pixels in the display screen of the next frame. Meanwhile, GM adjusts GM voltage after receiving a gamma adjustment command from TCON to generate compensated gamma voltage, but when the compensated gamma voltage is output to Driver, all gamma voltages are not directly given to the Driver within several rows of time, in this embodiment, by adding an OP (Operational Amplifier ) circuit or an RC Delay (RC Delay, a signal Delay caused by a charging and discharging process of a capacitor C controlled by a resistor R in an integrated circuit) to the output end of GM, GM voltage is changed slowly, and the time for GM to take effect is changed from several rows to several tens of rows, although brightness differences of pixels of different rows before and after GM is taken effect in a next frame of display picture are not completely eliminated in practice, the slow change process is enough to make naked eyes not feel.

The embodiment provides a brightness compensation method, which does not need to improve an I2C circuit and a TCON internal circuit, but reduces the difference of GM before and after the GM is effective as small as possible under the condition that T1 is maintained to be larger than T2, and makes the GM be effective as gentle as possible, although the GM has bright and dark differences before and after the GM is effective, the difference is not large, as long as the GM is not required to be ended within a period of several lines, but is gradually excessive in tens of lines, the adjacent lines have only slight differences, so that the split screen phenomenon is not perceived by naked eyes, and the split screen phenomenon caused by the GM before and after the GM is effective can be solved for users.

In addition, an embodiment of the present application further provides a driving circuit of a display panel, referring to fig. 2, fig. 2 is a schematic structural diagram of the driving circuit of the display panel according to an embodiment of the present application, where the driving circuit of the display panel includes: the display device comprises a time sequence control circuit 01, a gamma circuit 02 and a data driving circuit 03, wherein the time sequence control circuit 01 is connected with the gamma circuit 02 and the data driving circuit 03, the gamma circuit 02 is connected with the data driving circuit 03, the data driving circuit 03 is connected with a display area 04 of a display panel, and the driving circuit of the display panel is used for executing the brightness compensation method provided by each embodiment.

In some possible embodiments, the driving circuit of the display panel further includes: the signal source 05 and the power supply circuit 06, the signal source 05 is connected with the time sequence control circuit 01 and the power supply circuit 06, and the power supply circuit 06 is connected with the time sequence control circuit 01, the gamma circuit 02 and the data driving circuit 03.

The driving circuit of the display panel provided in this embodiment belongs to the same inventive concept as the brightness compensation method provided in the above embodiment, and technical details not described in detail in this embodiment can be seen in any of the above embodiments, and this embodiment has the same advantages as the brightness compensation method.

In addition, the embodiment of the present application further provides a display panel, where the luminance compensation method provided in the above embodiment may be performed by a driving circuit of the display panel, and the driving circuit of the display panel is integrated in the display panel, and referring to fig. 7, fig. 7 is a schematic hardware structure of the display panel provided in the embodiment of the present application, and as shown in fig. 7, the display panel may include a panel body 100 and the driving circuit of the display panel provided in the above embodiment, where the driving circuit of the display panel is disposed in a non-display area 101 of the panel body 100.

As an example, the display panel In the present embodiment may be a TN (twisted nematic) display panel, an IPS (In-Plane Switching) display panel, a VA (Vertical Alignment) display panel, an MVA (Multi-Domain Vertical Alignment, multi-quadrant vertically aligned) display panel, or of course, other types of display panels, such as an OLED (organic light-Emitting Diode) display panel.

As an example, the display panel may be applied to a display device, which may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc.

It will be appreciated by those skilled in the art that the structure shown in fig. 7 is not limiting of the display device and may include more or fewer components than shown, or may combine certain components, or may be arranged in different components.

The display panel according to the present embodiment and the luminance compensation method according to the foregoing embodiments belong to the same inventive concept, and technical details not described in detail in the present embodiment can be seen in any of the foregoing embodiments, and the present embodiment has the same advantages as those of performing the luminance compensation method.

Furthermore, the embodiments of the present application also propose a computer readable storage medium, which is applied to a computer, and the computer readable storage medium may be a non-volatile computer readable storage medium, and the computer readable storage medium stores thereon a computer program, which when executed by a processor, implements the brightness compensation method according to any of the embodiments described above.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

While the preferred embodiments of the present application have been described in detail, the embodiments are not limited to the above-described embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the embodiments, and these equivalent modifications and substitutions are intended to be included in the scope of the embodiments of the present application as defined in the appended claims.

Claims

1. A brightness compensation method, the brightness compensation method comprising:

2. The brightness compensation method of claim 1, wherein the step of determining a refresh rate of a current frame according to the data enable signal comprises:

3. The brightness compensation method of claim 1, wherein the preset refresh rate threshold comprises: a first threshold, a second threshold, and a third threshold, the first threshold being greater than the second threshold, the second threshold being greater than the third threshold; the gamma set value includes: a first set point and a second set point, the first set point being less than the second set point;

4. A brightness compensation method according to any one of claims 1 to 3, wherein said step of brightness compensating the display of the next frame according to said gamma setting value comprises:

determining a gray scale voltage based on the gamma set value;

5. The brightness compensation method of claim 4, wherein the step of determining the gray scale voltage based on the gamma set value comprises:

determining a gamma voltage based on the gamma set point;

a gray scale voltage is generated based on the gamma voltage.

6. A brightness compensation method according to any one of claims 1-3, wherein prior to said step of brightness compensating the next frame of display according to said gamma setting value, said brightness compensation method further comprises:

7. The brightness compensation method of claim 6, wherein the step of performing brightness compensation on the next frame of display screen according to the gamma set value comprises:

8. The brightness compensation method of claim 7, wherein the plurality of sets of gamma voltages comprises: a first gamma voltage, a second gamma voltage, and a third gamma voltage; the plurality of groups of compensation gray scale voltages include: the device comprises a first compensation gray scale voltage, a second compensation gray scale voltage and a third compensation gray scale voltage, wherein the first compensation gray scale voltage is smaller than the second compensation gray scale voltage, and the second compensation gray scale voltage is smaller than the third compensation gray scale voltage;

9. A driving circuit of a display panel, characterized in that the driving circuit of the display panel comprises: the display device comprises a time sequence control circuit, a gamma circuit and a data driving circuit, wherein the time sequence control circuit is connected with the gamma circuit and the data driving circuit, the gamma circuit is connected with the data driving circuit, the data driving circuit is connected with a display area of a display panel, and the driving circuit of the display panel is used for executing the brightness compensation method according to any one of claims 1 to 8.

10. A display panel, characterized in that the display panel comprises a panel body and the driving circuit of the display panel according to claim 9, the driving circuit of the display panel being arranged in a non-display area of the panel body.