CN116386536A - Display substrate, display substrate brightness adjusting method and display - Google Patents
Display substrate, display substrate brightness adjusting method and display Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2003—Display of colours
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The embodiment of the application provides a display substrate, a display substrate brightness adjusting method and a display, wherein the display substrate comprises: a time sequence control module TCON and a plurality of display partitions; each display area comprises a control switch and a plurality of sub-pixels; the sub-pixel includes: a pixel circuit and a light emitting device; the control switch is connected with the light-emitting device in series; the time sequence control module TCON is connected with a control end of the control switch; the time sequence control module TCON is used for determining a target duty ratio of each display partition based on the brightness value of the display partition; and adjusting the duty ratio of the display partition by controlling a control switch of the display partition according to the target duty ratio of the display partition. When brightness difference exists in the full-screen display area of the display substrate, the high duty ratio of the high brightness area and the low duty ratio of the low brightness area can be realized in a mode of adjusting the duty ratio by the partition, so that the display brightness uniformity of the display substrate is improved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display substrate, a method for adjusting brightness of the display substrate, and a display.
Background
The conventional PWM (Pulse Width Modulation ) dimming is performed by controlling the on and off time of an EM (emission control) tube through an EOA (Emission Driver On Array, light emission driving) of an array substrate, so that a display screen can be refreshed according to a preset Duty (ratio of the on time of the EM tube to the on-off period of the EM tube), but the uniformity of the display brightness of the display substrate is poor.
Disclosure of Invention
An objective of the embodiments of the present application is to provide a display substrate, a display substrate brightness adjustment method and a display, so as to improve display brightness uniformity of the display substrate. The specific technical scheme is as follows:
in a first aspect, embodiments of the present application provide a display substrate, including: a time sequence control module TCON and a plurality of display partitions; each display partition comprises a control switch and a plurality of sub-pixels;
the sub-pixel includes: a pixel circuit and a light emitting device;
the control switch is connected with the light-emitting device in series; the time sequence control module TCON is connected with the control end of the control switch;
the time sequence control module TCON is used for determining a target duty ratio of each display partition based on the brightness value of the display partition; and adjusting the duty ratio of the display partition by controlling a control switch of the display partition according to the target duty ratio of the display partition.
In one possible implementation manner, for any one sub-pixel, a first end of a control switch corresponding to the sub-pixel is connected with a positive electrode end of a power supply, a second end of the control switch is connected with a pixel circuit of the sub-pixel, and the pixel circuit of the sub-pixel is connected with a light emitting device of the sub-pixel;
or alternatively;
for any one sub-pixel, the first end of a control switch corresponding to the sub-pixel is connected with a pixel circuit of the sub-pixel, the second end of the control switch is connected with a light emitting device of the sub-pixel, and the pixel circuit of the sub-pixel is connected with a positive electrode end of a power supply;
or alternatively;
for any one sub-pixel, the first end of the control switch corresponding to the sub-pixel is connected with the light emitting device of the sub-pixel, the second end of the control switch is connected with the negative electrode end of the power supply, and the light emitting device of the sub-pixel is connected with the pixel circuit of the sub-pixel.
In one possible implementation manner, the timing control module TCON includes a plurality of gate control signal terminals, the control terminals of the control switches in the same display partition are connected to the same gate control signal terminal, and the control terminals of the control switches in different display partitions are connected to different gate control signal terminals.
In a possible implementation manner, for each display partition, one control switch in the display partition corresponds to one pixel circuit;
or alternatively;
one control switch corresponds to a plurality of pixel circuits.
In a possible implementation manner, the timing control module TCON is further configured to: acquiring brightness data to be displayed of each display partition of the display substrate; and analyzing the brightness data of each display partition to determine the brightness value of the display partition.
In one possible implementation, the timing control module TCON is specifically configured to: for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a first preset corresponding relation under the condition that the brightness value of the display partition is in a first brightness value interval; the first preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of increasing a current value and reducing the duty ratio;
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a second preset corresponding relation under the condition that the brightness value of the display partition is in a second brightness value interval; the second preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of reducing a current value and increasing the duty ratio;
the brightness value of the second brightness value interval is higher than the brightness value of the first brightness value interval.
In a second aspect, an embodiment of the present application provides a method for adjusting brightness of a display substrate, which is applied to the display substrate in any one of the first aspect, and the method includes:
for each display partition, determining a target duty cycle for the display partition based on a luminance value of the display partition;
the duty cycle of the display partition is adjusted by controlling the control switch of the display partition according to the target duty cycle of the display partition.
In one possible embodiment, the method further comprises:
acquiring brightness data to be displayed of each display partition of the display substrate;
and analyzing the brightness data of each display partition to determine the brightness value of the display partition.
In one possible implementation manner, the determining, for each display partition, the target duty cycle of the display partition based on the brightness value of the display partition includes:
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a first preset corresponding relation under the condition that the brightness value of the display partition is in a first brightness value interval; the first preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of increasing a current value and reducing the duty ratio;
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a second preset corresponding relation under the condition that the brightness value of the display partition is in a second brightness value interval; the second preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of reducing a current value and increasing the duty ratio;
the brightness value of the second brightness value interval is higher than the brightness value of the first brightness value interval.
In a third aspect, embodiments of the present application provide a display, where the display includes the display substrate according to any one of the first aspect.
The beneficial effects of the embodiment of the application are that:
the embodiment of the application provides a display substrate, a display substrate brightness adjusting method and a display, wherein the display substrate comprises: a time sequence control module TCON and a plurality of display partitions; each display partition comprises a control switch and a plurality of sub-pixels; the sub-pixel includes: a pixel circuit and a light emitting device; the control switch is connected with the light-emitting device in series; the time sequence control module TCON is connected with the control end of the control switch; the time sequence control module TCON is used for determining a target duty ratio of each display partition based on the brightness value of the display partition; and adjusting the duty ratio of the display partition by controlling a control switch of the display partition according to the target duty ratio of the display partition. By dividing the full-screen display area into a plurality of display subareas, for each display subarea, the target duty ratio suitable for the display subarea can be determined according to the brightness value of the display subarea, and the duty ratio of the display subarea is adjusted to be the target duty ratio, so that when the brightness difference exists in the full-screen display area of the display substrate, the high duty ratio of the high brightness area and the low duty ratio of the low brightness area can be realized in a mode of adjusting the duty ratio by the subareas, and compared with the related art, the display brightness uniformity of the display substrate is improved.
Of course, not all of the above-described advantages need be achieved simultaneously in practicing any one of the products or methods of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other embodiments may also be obtained according to these drawings to those skilled in the art.
FIG. 1 is a schematic diagram of the on and off of EM tubes corresponding to different Duty in a frame;
FIG. 2 is a schematic diagram of simulation results showing uniformity at different gray levels;
FIG. 3 is a schematic diagram showing the effect of different Duty on display uniformity at a constant brightness;
FIG. 4 is a timing diagram of the gate control signal of the EOA of the related art (Duty is 50%);
fig. 5 is a schematic diagram of a real-time luminance curve of OLED light emission and non-light emission when duty=50%;
fig. 6a is a schematic structural diagram of a display substrate according to an embodiment of the present disclosure;
FIG. 6b is a schematic diagram of the partitioning of multiple display partitions;
FIG. 7a is a schematic diagram showing a first connection relationship among a control switch, a pixel circuit and a light emitting device;
FIG. 7b is a schematic diagram showing a second connection relationship among the control switch, the pixel circuit and the light emitting device;
FIG. 7c is a schematic diagram illustrating a third connection relationship among the control switch, the pixel circuit, and the light emitting device;
FIG. 8a is a schematic view of a display substrate including 4 display regions;
FIG. 8b is a waveform diagram of a gate control signal based on the 4 display sections of FIG. 8 a;
FIG. 9 is a schematic diagram of a relationship between 1 control switch shared by 8 sub-pixels in a display area;
fig. 10 is a schematic flow chart of a first process for adjusting brightness of a display substrate according to an embodiment of the disclosure;
fig. 11 is a schematic diagram of a second flow of a method for adjusting brightness of a display substrate according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram of a third flow chart of a method for adjusting brightness of a display substrate according to an embodiment of the present disclosure;
fig. 13 is a schematic diagram of a first structure of a display according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, a person of ordinary skill in the art would be able to obtain all other embodiments based on the disclosure herein, which are within the scope of the disclosure herein.
Firstly, a simple description is made of the dimming principle of PWM, which is simply to add a control switch EM tube between an Organic Light-Emitting Diode (OLED) and a power supply terminal, where the control switch EM tube is used to control the connection or disconnection between the OLED and the power supply terminal by switching on and off itself, that is, the on and off of the OLED. For example, for 1 second, the time control switch is on for 0.5 seconds, and the time control switch is off for 0.5 seconds, so that the light emitting device OLED is turned on for 0.5 seconds and off for 0.5 seconds, and then the light emitting device blinks continuously. If the frequency is set high a little, for example, in 1 ms, the time control switch is on for 0.5 ms and the time control switch is off for 0.5 ms, the flicker frequency of the light emitting device OLED is high. When the flicker frequency exceeds a certain threshold, human eyes cannot feel flicker of the light emitting device OLED, and only half of the original brightness of the light emitting device OLED can be seen.
Based on the above principle, the brightness of the display area can be adjusted by controlling the time for which the switch EM tube controls the switch to be turned on and off. That is, the pixel current of the same display luminance can be changed by the EM tube, for example, 100nit (nit, that is nit, which is a unit of luminance, refers to the degree of brightness of an object, and is defined as the light emission intensity per unit area), if the EM tube is always on, that is, the required light emission current is 1uA (microampere) when the Duty (light emission time Duty) is 100%, the EM tube is turned off for half the time, and turned on for half the time, that is, the required light emission current is 2uA when the Duty is 50%, that is, the required light emission current is reduced by half, and the light emission current is doubled to achieve the same luminance.
In summary, the same display brightness can be achieved by adjusting the Duty value of the EM tube and changing the OLED lighting current to achieve a fixed or target brightness, i.e. shortening/increasing the OLED lighting time, and increasing/decreasing the OLED lighting brightness. In one example, as shown in fig. 1, the EM tubes corresponding to different Duty are turned on and off in one frame.
When the display luminance is L, duty=100% (kept normally on), and the emission current required for each pixel OLED is Ip in order to achieve the display luminance L; at duty=50%, in order to achieve the display luminance L, the light emission current required for each pixel OLED is about 2Ip; at duty=25%, in order to achieve the display luminance L, the light emission current required for each pixel OLED is about 4Ip; at duty=5%, the emission current required for each pixel OLED is about 20Ip in order to achieve the display luminance L. The larger the emission current of the pixel OLED, the better the uniformity, see fig. 2, which is a schematic diagram of the simulation result showing uniformity at different gray scales. When the brightness level is 64 gray levels, the display uniformity corresponding to the Duty of 100% is 84.0%, and the display uniformity corresponding to the Duty of 25% is 87.2%; when the brightness level is 100 gray levels, the display uniformity corresponding to the Duty of 100% is 86.6%, and the display uniformity corresponding to the Duty of 25% is 92.8%; when the brightness level is 200 gray scale, the display uniformity corresponding to the Duty of 100% is 94.2%, and the display uniformity corresponding to the Duty of 25% is 96.7%; when the luminance level is 225 gray, the display uniformity is 95.2% for a Duty of 100% and 97.2% for a Duty of 25%. Also, fig. 3 shows the effect of different Duty on display uniformity at a constant display luminance, with a display uniformity of 48.3% for Duty 100%, 57.1% for Duty 50%, 67.7% for Duty 25%, and 74.7% for Duty 5% for 10.51 nit; when the display luminance was 48.3nit, the display uniformity was 68.2% for the Duty of 100%, 76.9% for the Duty of 50%, 83.2% for the Duty of 25%, and 89.6% for the Duty of 5%. The adjustment Duty is reduced under the same display brightness, the display uniformity effect of the display substrate is better, the requirements of the display uniformity on the Duty are different under different brightness, the Duty can be not too small if the display uniformity is better when the display brightness is higher, and the Duty needs to be reduced if the display uniformity is better when the display brightness is lower. I.e. the higher the display brightness the greater the Duty can be, and the lower the display brightness the less the Duty needs to be.
Conventional PWM dimming is performed by EOA controlling the times at which each pixel row EM tube is turned on and off, and cascading row by row, so the Duty of PWM dimming in the full screen display area within each frame must be kept consistent. That is, no matter how much the brightness difference is in the full-screen display area within this frame, one Duty adjustment must be maintained, and various display brightnesses tend to exist in the full-screen display area, resulting in poor uniformity of the display brightness of the display substrate. The uneven display brightness of the display substrate can cause larger light and shade differences of the screen, and human eyes consume more energy than usual when processing the light and shade differences, so that the eyes are particularly easy to fatigue when the display screen with uneven display brightness is used. Referring to fig. 4, a timing diagram of a gate control signal of EOA in the related art (Duty is 50%), and a corresponding real-time luminance curve diagram of the OLED with and without light emission when Duty is 50% is shown in fig. 5.
In order to solve the above-mentioned problem, the present embodiment provides a display substrate 1, see fig. 6a, the display substrate 1 includes: the timing control module TCON (Timing Controller) and a plurality of display partitions 12; each display section 12 includes a control switch 121 and a plurality of sub-pixels 122;
the sub-pixel 122 includes: a pixel circuit 1221 and a light emitting device 1222;
the control switch 121 is connected in series with the light emitting device 1222; the time sequence control module TCON11 is connected with the control end of the control switch 121;
the timing control module TCON11 is configured to determine, for each display partition 12, a target duty cycle of the display partition 12 based on a luminance value of the display partition 12; and adjusts the duty cycle of the display partition 12 by controlling the control switch of the display partition 12 in accordance with the target duty cycle of the display partition 12.
The more and more accurate the number of the display partitions, the more the number of the display partitions, and the better the display uniformity of the display substrate, the number of the display partitions is not particularly limited in the application. In one example, the full screen display area may be divided into 32×9=288 display sections, as shown in fig. 6b, and for each display section, the duty cycle of the display section may be adjusted by individually controlling the control switch of the display section.
It will be appreciated that the layout of the display zones and control switches etc. shown in fig. 6a is not exclusive and that the concept of "multiple" is illustrated in fig. 6 a.
In the embodiment of the application, the full-screen display area is divided into the plurality of display partitions, and for each display partition, the target duty ratio suitable for the display partition can be determined according to the brightness value of the display partition, and the duty ratio of the display partition is adjusted to be the target duty ratio, so that when brightness difference exists in the full-screen display area of the display substrate, the high duty ratio of the high brightness area and the low duty ratio of the low brightness area can be realized in a mode of adjusting the duty ratio by the partition, and compared with the related technology, the uniformity of the display brightness of the display substrate is improved. In one example, the display brightness of the first display partition is 10.51nit, the display brightness of the second display partition is 48.3nit, in order to make the display uniformity between the first display partition and the second display partition better, the target duty ratio of the first display partition may be determined to be 5%, the target duty ratio of the second display partition may be determined to be 25%, and then the control switches of the display partitions are independently controlled by the timing control module TCON to adjust the duty ratio of the display partitions to the corresponding target duty ratio. The duty cycle adjustment mode of the rest display areas is the same. Through the embodiment, the area duty with lower display brightness can be smaller, the display uniformity of the low-brightness area is effectively improved, and the duty of the area with higher display brightness (with relatively better display uniformity) can be larger, so that the influence of PWM dimming on the service life of the light-emitting device in the high-brightness area (the longer the light-emitting current is, the faster the service life of the light-emitting device is attenuated) can be reduced, and the aging of the light-emitting device is weakened.
In one possible embodiment, referring to fig. 7a, for any one of the sub-pixels 122, a first terminal of a control switch 121 corresponding to the sub-pixel 122 is connected to a power supply positive terminal ELVDD, a second terminal of the control switch 121 is connected to a pixel circuit 1221 of the sub-pixel 122, and the pixel circuit 1221 of the sub-pixel 122 is connected to a light emitting device 1222 of the sub-pixel 122;
the light emitting device 1222 of the sub-pixel 122 is connected to the power supply negative terminal ELVSS.
Or alternatively;
for any one of the sub-pixels 122, referring to fig. 7b, a first terminal of a control switch 121 corresponding to the sub-pixel 122 is connected to a pixel circuit 1221 of the sub-pixel 122, a second terminal of the control switch 121 is connected to a light emitting device 1222 of the sub-pixel 122, and the pixel circuit 1221 of the sub-pixel 122 is connected to a power source positive electrode terminal ELVDD;
the light emitting device 1222 of the sub-pixel 122 is connected to the power supply negative terminal ELVSS.
Or alternatively;
for any one of the sub-pixels 122, referring to fig. 7c, a first terminal of a control switch 121 corresponding to the sub-pixel 122 is connected to a light emitting device 1222 of the sub-pixel 122, a second terminal of the control switch 121 is connected to a power negative terminal ELVSS, and the light emitting device 1222 of the sub-pixel 122 is connected to a pixel circuit 1221 of the sub-pixel 122.
The pixel circuit 1221 of the sub-pixel 122 is connected to the power supply positive electrode terminal ELVDD.
The control switch is used for controlling the connection or disconnection between the light emitting device and the power supply end through the connection and disconnection of the control switch, and the position of the control switch is not unique. In one example, the light emitting device may be an OLED.
In the embodiment of the present application, the connection relationship among the control switch, the pixel circuit, and the light emitting device is described.
In a possible implementation manner, the timing control module TCON11 includes a plurality of gate control signal terminals, the control terminals of the control switches 121 in the same display partition 12 are connected to the same gate control signal terminal, and the control terminals of the control switches 121 in different display partitions 12 are connected to different gate control signal terminals.
In one example, referring to fig. 8a, the display substrate includes 4 display sections, and for each display section, the control ends of the control switches (EM tubes) in the display section are connected together, and a Common Gate control signal (GC signal) is used, that is, the Gate control signal of the first display section (section 1) is GC1, the Gate control signal of the second display section (section 2) is GC2, the Gate control signal of the third display section (section 3) is GC3, the Gate control signal of the fourth display section (section 4) is GC4, and the Gate control signals of each display section are independently controlled by the timing control module TCON and do not interfere with each other. The gate control signals can be controlled by the timing control module TCON to output different waveforms, and GC1, GC2, GC3, GC4 can be the same waveform signal or different waveform signals, and a specific waveform signal is related to the display brightness of the corresponding display area. When the display brightness of the 4 display partitions is different, the waveform schematic diagram of the gate control signals of the 4 display partitions is shown in fig. 8b, and for each display partition, when the gate control signal of the display partition is at a high level, each control switch in the display partition is turned on, and when the gate control signal of the display partition is at a low level, each control switch in the display partition is turned off, and the duty ratio of the first display partition is greater than the duty ratio of the second display partition is greater than the duty ratio of the third display partition is greater than the duty ratio of the fourth display partition.
As the number of display areas increases, the number of gate control signals increases, and one display area corresponds to one gate control signal. In one example, the full-screen display area may be divided into 32×9=288 display partitions, and 288 gate control signals are needed to realize partition PWM dimming in the full-screen display area.
It should be noted that, in the embodiment shown in fig. 8a, the first terminal of the control switch is connected to the power supply positive terminal ELVDD, the second terminal of the control switch is connected to the pixel circuit, and the pixel circuit is connected to the light emitting device.
In this embodiment, for each display partition, the control ends of the control switches in the display partition are connected together, and a common gate control signal is used, where the gate control signal of each display partition is independently controlled by the timing control module TCON and does not interfere with each other.
In a possible implementation manner, for each display partition, one control switch in the display partition corresponds to one pixel circuit;
or alternatively;
one control switch corresponds to a plurality of pixel circuits.
For each display area, the control switch and the sub-pixel may be in a one-to-one relationship, or in a one-to-many relationship (i.e. the plurality of sub-pixels share one control switch), but one control switch cannot be shared between different display areas. In one example, in the first display section, there may be one control switch corresponding to all the sub-pixels in the display section, there may be a plurality of control switches each corresponding to one sub-pixel in the display section, or there may be a plurality of control switches each corresponding to a plurality of sub-pixels in the display section. For example, if there are 10 subpixels in the first display section, 1 control switch may be configured in the display section, and these 10 subpixels may share 1 control switch; 10 control switches can be configured in the display partition, and each control switch corresponds to 1 sub-pixel; 5 control switches may be configured in the display partition, where each control switch corresponds to 2 sub-pixels, or the first control switch may correspond to 6 sub-pixels, and the remaining 4 control switches respectively correspond to 1 sub-pixel, where a specific allocation manner is not limited. The correspondence between control switches and sub-pixels is the same for all display regions. If all the sub-pixels in a display area share only one control switch, the control switch may be placed outside the AA area (the operable area), or may be placed on a peripheral printed circuit board (PCB, printed Circuit Board), which may be a timing control circuit board TCON circuit board, or may be a printed circuit board tailored to the control switch.
Fig. 9 shows a schematic diagram of a relationship of 1 control switch shared by 8 sub-pixels in a certain display area, where a first end of the control switch (EM tube) is connected to the power supply positive electrode terminal ELVDD, a second end of the control switch is connected to a pixel circuit of each sub-pixel, and the pixel circuit is connected to the light emitting device OLED. In each display region in fig. 8a, one control switch corresponds to one sub-pixel.
It can be understood that, for any control switch in the display substrate of the application, the control switch can be an N-type transistor or a P-type transistor, and specifically can be selected according to practical situations; the first end of the control switch is a source electrode or a drain electrode, and the second end of the control switch is a drain electrode or a source electrode corresponding to the first end. It can be understood that the control switch can be a P-type transistor or an N-type transistor, and specifically can be selected according to practical situations, but a device connection mode of a corresponding adjusting circuit is needed, and an alternative scheme thereof is still within the protection scope of the application.
It can be understood that the transistors used in the display substrate of the present application may be MOS transistors (Metal-Oxide-semiconductor field effect transistors, metal-Oxide-Semiconductor Field-Effect Transistor), TFT transistors (thin film transistors, thin Film Transistor) or other types of transistors, and may be specifically selected according to the actual situation, and the alternatives thereof are still within the scope of the present application.
The pixel circuit in any one of the sub-pixels may have a 7T1C structure (including 7 transistors and1 storage capacitor), or may have a structure of 6T1C, 5T2C, 8T1C, 8T2C, 9T2C, or the like.
It will be appreciated that for any of the above-described transistors in the pixel circuit, the transistor may be an N-type MOS transistor (Metal-Oxide-semiconductor field effect transistor, metal-Oxide-Semiconductor Field-Effect Transistor), a P-type MOS transistor, a CMOS transistor (Complementary Metal Oxide Semiconductor ), an N-type TFT transistor (thin film transistor, thin Film Transistor), a P-type TFT transistor, or other types of transistors, and may be specifically selected according to the actual situation.
In the embodiment of the application, for each display partition, one control switch in the display partition corresponds to one pixel circuit; alternatively, one control switch corresponds to a plurality of pixel circuits.
In a possible implementation manner, the timing control module TCON is further configured to: acquiring brightness data to be displayed of each display partition of the display substrate; and analyzing the brightness data of each display partition to determine the brightness value of the display partition.
The human eye can distinguish more strongly when looking at dark things, and the resolution can be weakened when looking at brighter things. That is, the human eyes have different resolution of light and shade, and the human eyes observe the brightness change conditionally, so that the concept of gamma is only provided.
The display screen in the current display field has 256 gray scales, namely 0-255 gray scales, each gray scale corresponds to a display brightness, and the following calculation formula is adopted: (gray scale value/256)/(x=display luminance), where the index X is a relationship between human eye sense and display luminance, and the standard is gamma2.2, and gamma2.2 is an empirical value summarized from a large number of human eye visual characteristics.
In one example, for each display area, the luminance data (gray scale value) of the display area is determined, and the luminance value (display luminance) of the display area is determined according to gamma 2.2.
In the embodiment of the present application, based on the luminance data of each display partition, the luminance value of each display partition may be determined according to gamma.
In one possible implementation, the timing control module TCON is specifically configured to: for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a first preset corresponding relation under the condition that the brightness value of the display partition is in a first brightness value interval; the first preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of increasing a current value and reducing the duty ratio;
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a second preset corresponding relation under the condition that the brightness value of the display partition is in a second brightness value interval; the second preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of reducing a current value and increasing the duty ratio;
the brightness value of the second brightness value interval is higher than the brightness value of the first brightness value interval.
In one example, referring to table 1, gamma can be adjusted according to 10 brightness bands (levels), and Band is initially set for adjusting gamma curve, so as to reasonably distinguish brightness levels. The number of setting bands is limited, and may be 9 or 10, and a fixed Duty (target Duty ratio) is set for each Band. The gamma curve is a relation curve between the gray scale value and the display brightness in the above embodiment.
TABLE 1
| Brightness initial setting | Maximum brightness | Duty | gamma |
| Band1 | 3nit | 3％ | gamma10 |
| Band2 | 6nit | 5％ | gamma20 |
| Band3 | 10nit | 10％ | gamma30 |
| Band4 | 20nit | 15％ | gamma40 |
| Band5 | 40nit | 20％ | gamma50 |
| Band6 | 80nit | 30％ | gamma60 |
| Band7 | 130nit | 45％ | gamma70 |
| Band8 | 200nit | 80％ | gamma80 |
| Band9 | 280nit | 90％ | gamma90 |
| Band10 | 400nit | 100％ | gamma100 |
However, there is a large brightness difference between bands, and when the display spans bands, i.e. when gamma is changed, there may be brightness jump or a clear boundary between display areas, so the number of bands may be increased by interpolation, see table 2, etc., so that the brightness difference between bands is reduced, thereby improving the above problem.
TABLE 2
In one example, for each display area, when the highest brightness value of all pixels in the display area is 10nit, then it corresponds to Band3, and the target duty cycle of the display area is 10%.
In one example, for each display area, when the highest brightness value of all pixels in the display area is 3.5nit, then it corresponds to band1.2, and the target duty cycle of the display area is 3.4%.
The method for adjusting the duty ratio in a partitioning way improves the uniformity of the display brightness and simultaneously slows down the aging of the light-emitting device. And the larger the number of display sections, the smaller the number of pixels per display section, and the finer the duty ratio can be set.
In the embodiment of the application, the high duty ratio of the high brightness area and the low duty ratio of the low brightness area are realized through the first preset corresponding relation and the second preset corresponding relation, and compared with the related art, the display brightness uniformity of the display substrate is improved.
The embodiment of the present application also provides a method for adjusting brightness of a display substrate, which is applied to the display substrate described in any one of the above embodiments, referring to fig. 10, and includes the following steps:
in step S1001, for each display partition, a target duty ratio of the display partition is determined based on the luminance value of the display partition.
The specific analysis is the same as above, and will not be described here again.
Step S1002, adjusting the duty ratio of the display partition by controlling the control switch of the display partition according to the target duty ratio of the display partition.
The specific analysis is the same as above, and will not be described here again.
In the embodiment of the application, the full-screen display area is divided into the plurality of display partitions, and for each display partition, the target duty ratio suitable for the display partition can be determined according to the brightness value of the display partition, and the duty ratio of the display partition is adjusted to be the target duty ratio, so that when brightness difference exists in the full-screen display area of the display substrate, the high duty ratio of the high brightness area and the low duty ratio of the low brightness area can be realized in a mode of adjusting the duty ratio by the partition, and compared with the related technology, the uniformity of the display brightness of the display substrate is improved.
In a possible implementation manner, referring to fig. 11, a second flowchart of the method for adjusting brightness of a display substrate according to an embodiment of the present application is further provided, based on fig. 10, with the following steps:
step S1101, obtaining brightness data to be displayed of each display area of the display substrate.
The specific analysis is the same as above, and will not be described here again.
In step S1102, for each display partition, the luminance data of the display partition is analyzed to determine the luminance value of the display partition.
The specific analysis is the same as above, and will not be described here again.
In the embodiment of the present application, based on the luminance data of each display partition, the luminance value of each display partition may be determined according to gamma.
In a possible implementation manner, referring to fig. 12, a third flowchart of the method for adjusting brightness of a display substrate provided in this embodiment of the present application is detailed in step S1001 based on fig. 10, and includes the following steps:
step S1201, for each display partition, determining, according to a first preset correspondence, a target duty cycle corresponding to the luminance value of the display partition when the luminance value of the display partition is in a first luminance value interval; the first preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and the first preset corresponding relation is obtained in advance based on the principles of increasing a current value and reducing the duty ratio.
The specific analysis is the same as above, and will not be described here again.
Step S1202, for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a second preset corresponding relation when the brightness value of the display partition is in a second brightness value interval; the second preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of reducing a current value and increasing the duty ratio.
The brightness value of the second brightness value interval is higher than the brightness value of the first brightness value interval.
The specific analysis is the same as above, and will not be described here again.
In the embodiment of the application, the high duty ratio of the high brightness area and the low duty ratio of the low brightness area are realized through the first preset corresponding relation and the second preset corresponding relation, and compared with the related art, the display brightness uniformity of the display substrate is improved.
The embodiment of the application further provides a display 2, referring to fig. 13, where the display 2 includes the display substrate 1 according to any one of the foregoing embodiments.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (10)
1. A display substrate, the display substrate comprising: a time sequence control module TCON and a plurality of display partitions; each display partition comprises a control switch and a plurality of sub-pixels;
the sub-pixel includes: a pixel circuit and a light emitting device;
the control switch is connected with the light-emitting device in series; the time sequence control module TCON is connected with the control end for controlling the light-on;
the time sequence control module TCON is used for determining a target duty ratio of each display partition based on the brightness value of the display partition; and adjusting the duty ratio of the display partition by controlling a control switch of the display partition according to the target duty ratio of the display partition.
2. The display substrate of claim 1, wherein the display substrate comprises a transparent substrate,
for any one sub-pixel, the first end of a control switch corresponding to the sub-pixel is connected with the positive electrode end of the power supply, the second end of the control switch is connected with the pixel circuit of the sub-pixel, and the pixel circuit of the sub-pixel is connected with the light emitting device of the sub-pixel;
or alternatively;
for any one sub-pixel, the first end of a control switch corresponding to the sub-pixel is connected with a pixel circuit of the sub-pixel, the second end of the control switch is connected with a light emitting device of the sub-pixel, and the pixel circuit of the sub-pixel is connected with a positive electrode end of a power supply;
or alternatively;
for any one sub-pixel, the first end of the control switch corresponding to the sub-pixel is connected with the light emitting device of the sub-pixel, the second end of the control switch is connected with the negative electrode end of the power supply, and the light emitting device of the sub-pixel is connected with the pixel circuit of the sub-pixel.
3. The display substrate according to claim 2, wherein the timing control module TCON includes a plurality of gate control signal terminals, the control terminals of the control switches in the same display partition are connected to the same gate control signal terminal, and the control terminals of the control switches in different display partitions are connected to different gate control signal terminals.
4. A display substrate according to claim 3, wherein for each of the display sections, one control switch in the display section corresponds to one pixel circuit;
or alternatively;
one control switch corresponds to a plurality of pixel circuits.
5. The display substrate according to claim 1, wherein the timing control module TCON is further configured to: acquiring brightness data to be displayed of each display partition of the display substrate; and analyzing the brightness data of each display partition to determine the brightness value of the display partition.
6. The display substrate according to claim 5, wherein the timing control module TCON is specifically configured to: for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a first preset corresponding relation under the condition that the brightness value of the display partition is in a first brightness value interval; the first preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of increasing a current value and reducing the duty ratio;
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a second preset corresponding relation under the condition that the brightness value of the display partition is in a second brightness value interval; the second preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of reducing a current value and increasing the duty ratio;
the brightness value of the second brightness value interval is higher than the brightness value of the first brightness value interval.
7. A method for adjusting brightness of a display substrate, applied to the display substrate of any one of claims 1 to 6, comprising:
for each display partition, determining a target duty cycle for the display partition based on a luminance value of the display partition;
the duty cycle of the display partition is adjusted by controlling the control switch of the display partition according to the target duty cycle of the display partition.
8. The method of claim 7, wherein the method further comprises:
acquiring brightness data to be displayed of each display partition of the display substrate;
and analyzing the brightness data of each display partition to determine the brightness value of the display partition.
9. The method of claim 8, wherein determining, for each display partition, the target duty cycle for the display partition based on the luminance value of the display partition comprises:
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a first preset corresponding relation under the condition that the brightness value of the display partition is in a first brightness value interval; the first preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of increasing a current value and reducing the duty ratio;
for each display partition, determining a target duty ratio corresponding to the brightness value of the display partition according to a second preset corresponding relation under the condition that the brightness value of the display partition is in a second brightness value interval; the second preset corresponding relation is a corresponding relation between a brightness value and a duty ratio, and is obtained in advance based on the principles of reducing a current value and increasing the duty ratio;
the brightness value of the second brightness value interval is higher than the brightness value of the first brightness value interval.
10. A display, characterized in that the display comprises a display substrate as claimed in any one of the preceding claims 1-6.
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