CN112259056B - Display panel and brightness correction method - Google Patents
Display panel and brightness correction method Download PDFInfo
- Publication number
- CN112259056B CN112259056B CN202010969883.2A CN202010969883A CN112259056B CN 112259056 B CN112259056 B CN 112259056B CN 202010969883 A CN202010969883 A CN 202010969883A CN 112259056 B CN112259056 B CN 112259056B
- Authority
- CN
- China
- Prior art keywords
- pixel
- sub
- display area
- sampling
- emitting unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
-
- 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
Abstract
The application discloses display panel and luminance correction method, this display panel includes: a first display area including a plurality of first sub-pixels, wherein at least one of the plurality of first sub-pixels is used as a first sampling sub-pixel; a second display region including a plurality of second sub-pixels, wherein at least one of the plurality of second sub-pixels serves as a second sampling sub-pixel; and the control circuit is used for acquiring the electric signals of the first sampling sub-pixel and the second sampling sub-pixel and executing correction operation according to the electric signals of the first sampling sub-pixel and the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the gray scale brightness of the second display area. By means of the mode, the problem that the gray scale brightness difference between the first display area and the second display area is large can be solved.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a display panel and a brightness correction method.
Background
The full-screen has become the great trend of display devices such as mobile phones, and in order to improve the screen occupation ratio as much as possible, the optical modules such as cameras and the like are arranged on the inner side of a cover plate of a display area as much as possible, namely, a design mode under the screen is adopted. Generally, a display panel in a display device includes a main display area and a sub display area, and the position of the sub display area corresponds to the position of a camera.
Because the main display area and the auxiliary display area have different resolutions and/or pixel densities, the life decay rates of the main display area and the auxiliary display area are inconsistent with the increase of the display time, and the problem of larger gray scale brightness difference is caused.
Disclosure of Invention
The application provides a display panel and a brightness correction method, which aim to solve the technical problem that the difference of the brightness of gray scales displayed in a first display area and a second display area is large.
In order to solve the technical problem, the application adopts a technical scheme that: provided is a display panel including: a first display region including a plurality of first sub-pixels, wherein at least one of the plurality of first sub-pixels serves as a first sampling sub-pixel; a second display region including a plurality of second sub-pixels, wherein at least one of the plurality of second sub-pixels is used as a second sampling sub-pixel; and the control circuit is used for acquiring the electric signals of the first sampling sub-pixel and the second sampling sub-pixel and executing correction operation according to the electric signals of the first sampling sub-pixel and the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the gray scale brightness of the second display area.
In order to solve the above technical problem, another technical solution adopted by the present application is: a method for correcting the brightness of a display panel is provided, which comprises the following steps: in response to receiving the brightness correction signals of the main screen and the auxiliary screen, the control circuit acquires the electric signals of the first sampling sub-pixel and the second sampling sub-pixel; wherein the display panel comprises a first display area and a second display area, at least one of a plurality of first sub-pixels in the first display area is used as the first sampling sub-pixel, and at least one of a plurality of second sub-pixels in the second display area is used as the second sampling sub-pixel; the control circuit executes correction operation according to the electric signals of the first sampling sub-pixel and the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the second display area.
Different from the prior art situation, the beneficial effects of this application are: the display panel provided by the application comprises at least one first sampling sub-pixel, at least one second sampling sub-pixel and a control circuit; the control circuit can acquire the electric signal of the first sampling sub-pixel and the electric signal of the second sampling sub-pixel, and perform correction operation according to the electric signal of the first sampling sub-pixel and the electric signal of the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the gray scale brightness of the second display area. The gray scale brightness difference between the first display area and the second display area can be automatically corrected at any time through the mode, compared with correction only once when the display panel leaves a factory, the flexibility is higher, and the display effect of the display panel is better; in addition, the introduced first sampling sub-pixel, the introduced second sampling sub-pixel and the introduced control circuit are low in cost, short in correction time and high in correction efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an embodiment of a control circuit;
FIG. 3 is a block diagram of one embodiment of the first sub-pixel or the second sub-pixel and the control circuit;
FIG. 4 is a circuit diagram of one embodiment of the first sampling sub-pixel or the second sampling sub-pixel of FIG. 3;
FIG. 5 is a block diagram of an embodiment of the pixel driving circuit of FIG. 4;
FIG. 6 is a circuit diagram of one embodiment of a pixel driving circuit of the non-sampled first sub-pixel or the non-sampled second sub-pixel of FIG. 1;
FIG. 7 is a flowchart illustrating a method for calibrating brightness of a display panel according to an embodiment of the present disclosure;
fig. 8 is a flowchart illustrating an embodiment corresponding to step S102 in fig. 7.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a display panel of the present application, where the display panel may be an OLED display panel, a Micro-OLED display panel, or the like. The display panel may include: a first display area AA1, a second display area AA2, and a control circuit (not shown). In the present embodiment, the position of the second display area AA2 is used to correspond to the position of an optical element such as a camera. Preferably, the light transmittance of the second display area AA2 is greater than that of the first display area AA 1.
The first display area AA1 includes a plurality of first sub-pixels 10, and at least one of the plurality of first sub-pixels 10 is used as the first sampling sub-pixel 100. The second display area AA2 includes a plurality of second sub-pixels 12, and at least one of the plurality of second sub-pixels 12 is used as the second sampling sub-pixel 120. The first sampling sub-pixel 100 performs a display function compared to the non-sampled first sub-pixel 10, except that the first sampling sub-pixel 100 may further sample the electrical signal. Similarly, the second sampling sub-pixel 120 performs a display function as compared to the non-sampled second sub-pixel 12, except that the second sampling sub-pixel 120 can further sample the electrical signal. The control circuit is used for obtaining the electrical signal of the first sampling sub-pixel 100 and the electrical signal of the second sampling sub-pixel 120, and performing a correction operation according to the electrical signal of the first sampling sub-pixel 100 and the electrical signal of the second sampling sub-pixel 120, so as to match the gray-scale luminance of the first display area AA1 and the gray-scale luminance of the second display area AA 2. The gray scale brightness matching means that when the first display area AA1 and the second display area AA2 display the same gray scale image, the brightness difference between the two is very small, even the brightness difference between the two is 0. In addition, the present application is not limited to the positions of the first sampling sub-pixel 100 and the second sampling sub-pixel 120; for example, the position of the sub-pixel having a large space where the wiring can be arranged around can be set as the sampling sub-pixel from the viewpoint of the wiring.
By the method, the gray scale brightness difference between the first display area AA1 and the second display area AA2 can be automatically corrected at any time, and compared with the correction only once when the display panel leaves a factory, the flexibility is higher, and the display effect of the display panel is better; in addition, the cost of the first sampling sub-pixel 100, the second sampling sub-pixel 120 and the control circuit is low, the required correction time is short, and the correction efficiency is high.
In one embodiment, as shown in fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a control circuit. The control circuit 14 includes a comparator 140 and a corrector 142. The comparator 140 is configured to obtain a first electrical signal of the first sampling sub-pixel 100 at least at one preset gray level and a second electrical signal of the second sampling sub-pixel 120 at least at one preset gray level, and obtain the calibration parameter β according to the first electrical signal and the second electrical signal corresponding to the same gray level; the corrector 142 is configured to update the driving voltage Vdate (i.e., the data voltage) of the second display area AA2 at each gray-scale value according to the calibration parameter β, so as to drive the second sub-pixel 12 in the second display area AA2 by using the updated driving voltage Vdate, so that the gray-scale luminance of the first display area AA1 and the gray-scale luminance of the second display area AA2 are matched. The first electrical signal and the second electrical signal compared by the comparator 140 may be a current signal or a voltage signal; in this embodiment, the corrector 142 may correct the driving voltage, and in other embodiments, the corrector 142 may also correct the power voltage of each gray scale. Generally, the brightness is related to the current magnitude and the light-emitting time duty ratio, and the current magnitude is related to the driving voltage Vdata. The mode of correcting the brightness by correcting the driving voltage Vdata is convenient and easy to realize.
In an application scenario, the selection of the preset gray levels involved in the comparison process of the comparator 140 may be selected according to actual requirements, for example, the preset gray levels are L255, L128, L64, L32, L8, and so on. For example, the gray scale with a smaller value may be selected as the predetermined gray scale as far as possible, because the brightness difference between the first display area AA1 and the second display area AA2 is more obvious when the gray scale is low, and the accuracy of the calibration of the control circuit 14 can be improved by selecting the low gray scale as the predetermined gray scale.
In another application scenario, the number of the preset grayscales may be at least two. The first electrical signal and the second electrical signal may be current signals, and the comparator 140 may use a ratio of the first electrical signal of the first sampling sub-pixel 100 at a predetermined gray level to the second electrical signal of the second sampling sub-pixel 120 at the predetermined gray level as the calibration parameter β; the corrector 142 may use the product of the original driving voltage of the second sampling sub-pixel 120 at the preset gray level and the calibration parameter β as the updated driving voltage.
After the comparator 140 and the corrector 142 obtain the updated driving voltages at the predetermined gray levels, for the driving voltages at other uncorrected gray levels, the other uncorrected driving voltages can be calculated by using the driving voltages at the corrected gray levels.
For example, the comparator 140 is further configured to obtain a first updated driving voltage and a first original driving voltage of the second sub-pixel 12 under the first corrected gray scale, and a second updated driving voltage and a second original driving voltage of the second sub-pixel 12 under the second corrected gray scale, where the current gray scale to be corrected is located between the first corrected gray scale and the second corrected gray scale; obtaining calibration parameters corresponding to the current gray scale to be corrected according to the first updated driving voltage, the first original driving voltage, the second updated driving voltage and the second original driving voltage; for example, a first ratio of the first updated driving voltage to the first original driving voltage and a second ratio of the second updated driving voltage to the second original driving voltage may be obtained; and taking half of the sum of the first ratio and the second ratio as a calibration parameter. The corrector 142 is further configured to use a product of the calibration parameter and the original driving voltage of the second sub-pixel 12 at the current gray scale to be corrected as the updated driving voltage, wherein the first corrected gray scale and the second corrected gray scale may be preset gray scales or non-preset gray scales. The above process is formulated as follows:
Vc_cal＝(Va_cal/Va_old+Vb_cal/Vb_old)/2*Vc_old；
wherein a and b are known adjacent corrected gray scales, and c is a gray scale to be corrected between a and b; va _ cal is the update drive voltage after the correction of the gradation a, and Vb _ cal is the update drive voltage after the correction of the gradation b; va _ old is the original driving voltage before correction of the gray scale a, and Vb _ old is the original driving voltage before correction of the gray scale b; vc _ cal is the updated driving voltage after the correction of the gray scale c, and Vc _ old is the original driving voltage before the correction of the gray scale c.
Of course, in another application scenario, the driving voltages at other uncorrected gray levels can be corrected in other ways. For example, the curve relationship between the calibration parameters at a plurality of preset gray levels and the preset gray levels can be obtained, then the calibration parameters at other gray levels can be obtained according to the curve relationship, and then the subsequent driving voltage correction can be performed by using the calibration parameters.
In another embodiment, please refer to fig. 3, wherein fig. 3 is a schematic diagram of an embodiment of the first sub-pixel or the second sub-pixel and the control circuit. The first sub-pixel 10 and the second sub-pixel 12 each include a pixel driving circuit 20 and a light emitting unit 22; the pixel driving circuit 20 is connected to the control circuit 14 to receive a driving voltage Vdate; the light emitting units 22 are connected to the pixel driving circuit 20, the pixel driving circuit 20 can drive the corresponding light emitting units 22 to emit light, and the light emitting units 22 can be red light emitting units, green light emitting units, blue light emitting units, and the like. The control circuit 14 adjusts the driving voltage Vdate of the pixel driving circuit 20 in the second sub-pixel 12 to match the gray-scale luminance of the light emitting unit 22 in the first display area AA1 with the gray-scale luminance of the light emitting unit 22 in the second display area AA 2. The first sub-pixel 10 and the second sub-pixel 12 have simple structural design and are easy to manufacture.
In the present embodiment, the structure of the pixel driving circuit 20 in the first sub-pixel 10 and the structure of the pixel driving circuit 20 in the second sub-pixel 12 may be the same or different. One pixel driving circuit 20 in the first sub-pixel 10 may drive one light emitting unit 22 to emit light, and one pixel driving circuit 20 in the second sub-pixel 12 may drive at least one light emitting unit 22 to emit light. In addition, the size and the arrangement of the light emitting units 22 in the first sub-pixel 10 may also be different from the size and the arrangement of the light emitting units 22 in the second sub-pixel 12, so as to achieve the purpose that the light transmittance of the second display area AA2 is greater than the light transmittance of the first display area AA 1.
Further, referring to fig. 3 again, the first sampling sub-pixel 100 and the second sampling sub-pixel 120 each further include a detection sampling circuit 24 connected to the pixel driving circuit 20 for detecting the electrical signal applied to the light emitting unit 22. The current or applied voltage flowing through the light emitting unit 22 can be conveniently obtained by the design of the detection sampling circuit 24; in addition, the detection sampling circuit 24 does not need to be arranged in each first sub-pixel 10 and each second sub-pixel 12, and the cost is low. In addition, the detecting and sampling circuit 24 and the pixel driving circuit 20 may be both located in an array layer of the display panel, and the detecting and sampling circuit 24 may be prepared together in the process of preparing the pixel driving circuit 20.
In one application scenario, as shown in fig. 4, fig. 4 is a circuit diagram of an embodiment of the first sampling sub-pixel or the second sampling sub-pixel in fig. 3. The detection sampling circuit 24 includes a switch unit 240 and a detection unit 242. The switch unit 240 is electrically connected to the output end P of the pixel driving circuit 20 and a path where the corresponding light emitting unit 22 is located, and the switch unit 240 is turned off when detecting the current of the corresponding light emitting unit 22 and turned on when the corresponding light emitting unit 22 emits light. The detecting unit 242 is electrically connected between the output end P of the pixel driving circuit 20 and the control circuit 14 (not shown in fig. 4), and the detecting unit 242 is turned on when detecting the current of the corresponding light emitting unit 22, and is turned off when making the corresponding light emitting unit 22 emit light. The detection sampling circuit 24 is simple in design, and only needs to be simply changed based on the original pixel driving circuit 20.
For example, the above-mentioned switching unit 240 includes a switching transistor K1 having a first path terminal K10 and a second path terminal K12 electrically connected to the output terminal P of the pixel driving circuit 20 and the anode 220 of the light emitting unit 22, respectively, and a control terminal K14 receiving the first enable signal EM 1. And/or, the detecting unit 242 includes a detecting transistor K2, a first path terminal K20 and a second path terminal K22 of which are electrically connected to the output terminal P of the pixel driving circuit 20 and the control circuit 14 (not shown in fig. 4), respectively, and a control terminal K24 of which receives the detecting signal Detect. The switch unit 240 and the detecting unit 242 have a simple structure and occupy a small space, so as to reduce the influence on the original display panel layout. Of course, in other embodiments, the switch unit 240 and the detecting unit 242 may further include other circuit elements, for example, the control circuit 14 may obtain the current signal through the detecting transistor K2, and in other embodiments, other elements may be introduced between the detecting transistor K2 and the control circuit 14, so that the control circuit 14 obtains the voltage signal.
In another embodiment, referring to fig. 4 and 5 together, fig. 5 is a block diagram of an embodiment of the pixel driving circuit shown in fig. 4. The pixel driving circuit 20 may be a 2T1C driving circuit, a 3T1C driving circuit, a 3T2C driving circuit, a 5T1C driving circuit, a 6T1C driving circuit, a 7T1C driving circuit, a 7T2C driving circuit, an 8T1C driving circuit, or the like, in terms of the number of transistors. The pixel driving circuit 20 may include, in terms of function: a power supply unit 200, a driving voltage writing unit 202, a driving unit 204, and an initialization unit 206.
The power supply unit 200 is configured to receive the second enable signal EM2 and provide a power supply signal VDD for the corresponding light emitting unit 22 according to the second enable signal EM 2; for example, the power supply unit 200 in fig. 4 includes a thin film transistor T1, a first path terminal of which receives the power signal VDD, and a control terminal of which receives the second enable signal EM 2.
The driving voltage writing unit 202 receives the first scan signal S1 to write the driving voltage Vdata under the driving of the first scan signal S1 (also referred to as the present-stage scan signal); for example, the driving voltage writing unit 202 in fig. 4 includes thin film transistors T2 and T3, control terminals of T2 and T3 receive the first scan signal, and a first path terminal of T2 receives the driving voltage Vdata. In addition, T3 in fig. 4 is in the form of a double-gate transistor, and in other embodiments, the T3 structure may be the same as the T2 structure, which is not limited in this application.
The driving unit 204 is connected to the driving voltage writing unit 202 and the power supply unit 200 to write the stored driving voltage Vdata, and generates a current matching the driving voltage Vdata by using the power signal VDD according to the driving voltage Vdata, so as to drive the corresponding light emitting unit 22 to emit light by using the current; for example, the driving unit 204 in fig. 4 includes a thin film transistor T4.
The initialization unit 206 receives the second scan signal S2 and the third scan signal S3 to receive the reference signal Vref under the driving of the second scan signal S2 and the third scan signal S3, and initializes the driving unit 204 and the corresponding light emitting unit 22 with the reference signal Vref; for example, the initialization unit 206 in fig. 4 includes thin film transistors T5 and T6. In addition, T5 in fig. 4 is in the form of a double-gate transistor, and in other embodiments, the T5 structure may be the same as the T6 structure, which is not limited in this application.
The switch unit 240 is electrically connected between the output end P1 of the driving unit 204 and the anode 220, and the detection unit 242 is electrically connected between the output end P1 of the driving unit 204 and the control circuit 14.
The structure of the pixel driving circuit 20 is simple and mature, and the design of the switch unit 240 and the detecting unit 242 can make the whole circuit simple.
Correspondingly, the circuit structure of the pixel driving circuit 20a of the first sub-pixel 10 and the second sub-pixel 12 of the other non-sampling sub-pixels can be as shown in fig. 6, and fig. 6 is a circuit schematic diagram of an embodiment of the pixel driving circuit of the non-sampling first sub-pixel or the second sub-pixel in fig. 1. The difference between the pixel driving circuit 20a in fig. 6 and the pixel driving circuit 20 in fig. 4 is that the power supply unit (not labeled in fig. 6) includes thin film transistors T1 and K1a, wherein K1a is originally the switching transistor in fig. 4, and in order to reduce the complexity of the manufacturing process, the detecting transistor K2 in fig. 4 is directly removed, and the control terminal of the switching transistor K1 in fig. 4 is connected to the control terminal of the thin film transistor T1, so as to form the thin film transistor K1a in fig. 6.
In one application scenario, the working process for the pixel driving circuit 20 and the detection and sampling circuit 24 in fig. 4 may be as follows:
s1: t5 is turned on, the rest transistors are turned off, and the Vref voltage is charged to the N1 node to initialize the N1 node;
s2: turning on the T2 and the T3, turning off the other transistors, charging the Vdata voltage to an N2 node, wherein the T4 is a Source follower, and the voltage of the N1 node is close to the Vdata voltage;
s3: t6 is turned on, the rest are turned off, and Vref charges to anode 220 node to initialize anode 220;
s4: t1, K1, T4 are turned on, the rest transistors are turned off, and the voltage of the N1 node controls the current of T1. When a current flows through the node of the anode 220, the light-emitting unit 22 emits light;
s5 (sampling step): t1, K2, and T4 are turned on, and the rest of the transistors are turned off, so that a current flows through K2, and the current has the same magnitude as that in step S4.
As can be seen from the above steps, the addition of the detection sampling circuit 24 has no influence on the normal light emitting process, and the detection method is simple; in addition, in order to improve the detection accuracy, the step S5 is performed after the step S4, i.e., after the light-emitting unit 22 emits light normally, the detection step is performed.
Referring to fig. 7, fig. 7 is a schematic flowchart illustrating an embodiment of a brightness correction method for a display panel according to the present application, where the brightness correction method specifically includes:
s101: in response to receiving the brightness correction signals of the main screen and the auxiliary screen, the control circuit acquires the electric signals of the first sampling sub-pixel and the second sampling sub-pixel; the display panel comprises a first display area and a second display area, wherein at least one of a plurality of first sub-pixels in the first display area is used as a first sampling sub-pixel, and at least one of a plurality of second sub-pixels in the second display area is used as a second sampling sub-pixel.
Specifically, the source of the main-sub screen brightness correction signal may be triggered by a user, or may be automatically triggered when the display panel displays the same gray-scale image in the first display area and the second display area and the brightness difference between the two is found to be obvious.
S102: the control circuit executes correction operation according to the electric signals of the first sampling sub-pixel and the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the gray scale brightness of the second display area.
Specifically, in an embodiment, as shown in fig. 8, fig. 8 is a schematic flowchart of an embodiment corresponding to step S102 in fig. 7. The step S102 specifically includes:
s201: and acquiring a first electric signal of the first sampling sub-pixel under at least one preset gray scale and a second electric signal of the second sampling sub-pixel under at least one preset gray scale, and acquiring calibration parameters according to the first electric signal and the second electric signal.
For example, when the first electrical signal and the second electrical signal are current values, the calibration parameter may be a ratio of the first electrical signal and the second electrical signal.
S202: and updating the driving voltage of the second display area at each gray-scale value according to the calibration parameters, so that the updated driving voltage is used for driving the second sub-pixels in the second display area.
Specifically, for the preset gray scale, the product of the original driving voltage of the second sub-pixel at the current preset gray scale value and the corresponding calibration parameter may be used as the corrected updated driving voltage.
For the non-preset gray scale, the step S201 further includes: after the preset gray scales are corrected, the corresponding calibration parameters can be obtained through the original driving voltage and the updated driving voltage of the second sub-pixels corresponding to two corrected gray scales adjacent to the current gray scale to be corrected. Correspondingly, the step S202 further includes: and taking the product of the original driving voltage of the second sub-pixel under the current gray scale to be corrected and the corresponding calibration parameter as the corrected updated driving voltage. For a specific process, reference may be made to the above structural part embodiment, which is not described herein again. The method for correcting the driving voltage under each gray-scale value is simple and the calculated amount is small.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (6)
1. A display panel, comprising:
a first display region including a plurality of first sub-pixels, wherein at least one of the plurality of first sub-pixels serves as a first sampling sub-pixel;
a second display region including a plurality of second sub-pixels, wherein at least one of the plurality of second sub-pixels serves as a second sampling sub-pixel;
the control circuit is used for acquiring the electric signals of the first sampling sub-pixel and the second sampling sub-pixel and executing correction operation according to the electric signals of the first sampling sub-pixel and the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the gray scale brightness of the second display area;
wherein the first sub-pixel and the second sub-pixel each include: the pixel driving circuit is connected with the control circuit to receive driving voltage; a light emitting unit connected to the pixel driving circuit; the control circuit adjusts the driving voltage of the pixel driving circuit in the second sub-pixel to enable the gray scale brightness of the light emitting unit in the first display area to be matched with the gray scale brightness of the light emitting unit in the second display area;
further, the first sampling sub-pixel and the second sampling sub-pixel respectively include: a detection sampling circuit connected to the pixel driving circuit to detect the electrical signal applied to the light emitting unit; the detection sampling circuit comprises: the switch unit is electrically connected to the output end of the corresponding pixel driving circuit and a passage where the light-emitting unit is located, and is switched off when the current of the corresponding light-emitting unit is detected and switched on when the corresponding light-emitting unit emits light; the detection unit is electrically connected between the output end of the pixel driving circuit and the control circuit, is conducted when detecting the current of the corresponding light-emitting unit and is disconnected when enabling the corresponding light-emitting unit to emit light;
wherein the control circuit comprises: the comparator is used for acquiring a first electric signal of the first sampling sub-pixel under at least one preset gray scale and a second electric signal of the second sampling sub-pixel under at least one preset gray scale, and acquiring a calibration parameter according to the first electric signal and the second electric signal; and the corrector is used for updating the driving voltage of each gray scale value of the second display area according to the calibration parameter, so that the second sub-pixel is driven by the updated driving voltage, and the gray scale brightness of the first display area is matched with that of the second display area.
2. The display panel according to claim 1,
the switch unit comprises a switch transistor, a first path end and a second path end of the switch transistor are respectively and electrically connected with the output end of the pixel driving circuit and the anode of the light-emitting unit, and a control end of the switch transistor receives a first enabling signal; and/or the presence of a gas in the gas,
the detection unit comprises a detection transistor, a first path end and a second path end of the detection transistor are respectively and electrically connected with the output end of the pixel driving circuit and the control circuit, and a control end of the detection transistor receives a detection signal.
3. The display panel according to claim 1, wherein the pixel driving circuit comprises:
the power supply unit is used for receiving a second enabling signal and providing a power supply signal for the corresponding light-emitting unit according to the second enabling signal;
the driving voltage writing unit receives a first scanning signal and writes a driving voltage under the driving of the first scanning signal;
the driving unit is connected with the driving voltage writing unit and the power supply unit so as to write and store the driving voltage, and generates current matched with the driving voltage by using the power supply signal according to the driving voltage, so that the corresponding light-emitting unit is driven to emit light by using the current;
an initialization unit receiving a second scan signal and a third scan signal to receive a reference signal driven by the second scan signal and the third scan signal and initializing the driving unit and a corresponding light emitting unit using the reference signal;
the switch unit is electrically connected between the output end of the driving unit and the anode, and the detection unit is electrically connected between the output end of the driving unit and the control circuit.
4. A method for correcting brightness of a display panel is characterized by comprising the following steps:
in response to receiving the brightness correction signals of the main screen and the auxiliary screen, the control circuit acquires the electric signals of the first sampling sub-pixel and the second sampling sub-pixel; wherein the display panel comprises a first display area and a second display area, at least one of a plurality of first sub-pixels in the first display area is used as the first sampling sub-pixel, and at least one of a plurality of second sub-pixels in the second display area is used as the second sampling sub-pixel;
the control circuit executes correction operation according to the electric signals of the first sampling sub-pixel and the second sampling sub-pixel so as to match the gray scale brightness of the first display area and the second display area;
wherein the first sub-pixel and the second sub-pixel each include: the pixel driving circuit is connected with the control circuit to receive driving voltage; a light emitting unit connected to the pixel driving circuit; the control circuit adjusts the driving voltage of the pixel driving circuit in the second sub-pixel to enable the gray scale brightness of the light emitting unit in the first display area to be matched with the gray scale brightness of the light emitting unit in the second display area; further, the first sampling sub-pixel and the second sampling sub-pixel respectively include: a detection sampling circuit connected to the pixel driving circuit to detect the electrical signal applied to the light emitting unit; the detection sampling circuit comprises: the switch unit is electrically connected to the output end of the corresponding pixel driving circuit and a passage where the light-emitting unit is located, and is switched off when the current of the corresponding light-emitting unit is detected and switched on when the corresponding light-emitting unit emits light; the detection unit is electrically connected between the output end of the pixel driving circuit and the control circuit, is conducted when detecting the current of the corresponding light-emitting unit and is disconnected when enabling the corresponding light-emitting unit to emit light;
wherein the step of the control circuit performing a correction operation based on the electrical signal of the first sampling sub-pixel and the electrical signal of the second sampling sub-pixel comprises: acquiring a first electric signal of the first sampling sub-pixel under at least one preset gray scale and a second electric signal of the second sampling sub-pixel under at least one preset gray scale, and acquiring calibration parameters according to the first electric signal and the second electric signal; and updating the driving voltage of the second display area at each gray-scale value according to the calibration parameter, so that the updated driving voltage is used for driving the second sub-pixel in the second display area.
5. The luminance correction method according to claim 4,
the first electrical signal and the second electrical signal are current values, and the step of obtaining calibration parameters according to the first electrical signal and the second electrical signal comprises:
taking the ratio of the first electric signal to the second electric signal as a calibration parameter under the current preset gray scale;
the step of updating the driving voltage of the second display area at each gray-scale value according to the calibration parameter comprises:
and taking the product of the original driving voltage of the second sub-pixel under the current preset gray scale and the corresponding calibration parameter as the corrected updated driving voltage.
6. The luminance correction method according to claim 5,
the step of obtaining calibration parameters from the first electrical signal and the second electrical signal further comprises: after the preset gray scales are corrected, the corresponding calibration parameters are obtained through the original driving voltage and the updated driving voltage of the second sub-pixels corresponding to the two corrected gray scales adjacent to the current gray scale to be corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969883.2A CN112259056B (en) | 2020-09-15 | 2020-09-15 | Display panel and brightness correction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969883.2A CN112259056B (en) | 2020-09-15 | 2020-09-15 | Display panel and brightness correction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112259056A CN112259056A (en) | 2021-01-22 |
| CN112259056B true CN112259056B (en) | 2022-09-06 |
Family
ID=74232297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010969883.2A Active CN112259056B (en) | 2020-09-15 | 2020-09-15 | Display panel and brightness correction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112259056B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539205B (en) * | 2021-07-30 | 2022-07-29 | 深圳市华星光电半导体显示技术有限公司 | Pixel voltage determination method and device, electronic device and storage medium |
| CN114283728B (en) * | 2021-12-29 | 2023-11-17 | 昆山国显光电有限公司 | Compensation method and device for display panel and computer readable storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782310A (en) * | 2017-03-01 | 2017-05-31 | 上海天马有机发光显示技术有限公司 | A kind of image element circuit, driving method, display panel and display device |
| CN107016965A (en) * | 2017-05-26 | 2017-08-04 | 深圳市华星光电技术有限公司 | The compensation method of the OVSS voltage drops of OLED display and pixel-driving circuit |
| CN108399890A (en) * | 2018-05-30 | 2018-08-14 | 上海天马有机发光显示技术有限公司 | A kind of organic light emitting display panel and its driving method, organic light-emitting display device |
| CN108649059A (en) * | 2018-05-14 | 2018-10-12 | 京东方科技集团股份有限公司 | A kind of array substrate, display device and its driving method |
| CN110767132A (en) * | 2019-10-25 | 2020-02-07 | 深圳市华星光电半导体显示技术有限公司 | TFT (thin film transistor) electrical detection correction method, device and system and display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017049336A (en) * | 2015-08-31 | 2017-03-09 | 株式会社ジャパンディスプレイ | Display device |
| KR102410432B1 (en) * | 2017-08-04 | 2022-06-20 | 엘지디스플레이 주식회사 | OLED display and method of operating the same |
| CN110767158B (en) * | 2019-03-29 | 2020-10-27 | 昆山国显光电有限公司 | Display device, display panel thereof and pixel driving circuit of display panel |
| CN110610680A (en) * | 2019-09-30 | 2019-12-24 | 武汉天马微电子有限公司 | Display method, display panel, display device, luminance correction method, and storage medium |
| CN110599957B (en) * | 2019-10-25 | 2020-10-02 | 武汉天马微电子有限公司 | Gamma debugging device, gamma debugging method and display method for display panel |
-
2020
- 2020-09-15 CN CN202010969883.2A patent/CN112259056B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782310A (en) * | 2017-03-01 | 2017-05-31 | 上海天马有机发光显示技术有限公司 | A kind of image element circuit, driving method, display panel and display device |
| CN107016965A (en) * | 2017-05-26 | 2017-08-04 | 深圳市华星光电技术有限公司 | The compensation method of the OVSS voltage drops of OLED display and pixel-driving circuit |
| CN108649059A (en) * | 2018-05-14 | 2018-10-12 | 京东方科技集团股份有限公司 | A kind of array substrate, display device and its driving method |
| CN108399890A (en) * | 2018-05-30 | 2018-08-14 | 上海天马有机发光显示技术有限公司 | A kind of organic light emitting display panel and its driving method, organic light-emitting display device |
| CN110767132A (en) * | 2019-10-25 | 2020-02-07 | 深圳市华星光电半导体显示技术有限公司 | TFT (thin film transistor) electrical detection correction method, device and system and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112259056A (en) | 2021-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8810554B2 (en) | Display device and electronic product | |
| US11282452B2 (en) | Pixel circuitry and drive method thereof, array substrate, and display panel | |
| US7554514B2 (en) | Electro-optical device and electronic apparatus | |
| EP3200178B1 (en) | Pixel driver circuit, method, display panel, and display device | |
| US8063857B2 (en) | Image display apparatus | |
| US8723847B2 (en) | Display device and electronic product | |
| US8018401B2 (en) | Organic electroluminescent display and demultiplexer | |
| CN110097848B (en) | Display device, driving method for display device, and electronic apparatus | |
| US8212798B2 (en) | Display device and electronic product | |
| US9159263B2 (en) | Pixel with enhanced luminance non-uniformity, a display device comprising the pixel and driving method of the display device | |
| US20100149079A1 (en) | Display device, method of driving display device, and electronic apparatus | |
| CN108022557B (en) | Data driver and display device using the same | |
| KR20110031096A (en) | Display device | |
| JP2020519912A (en) | Pixel circuit, driving method thereof, and display panel | |
| CN108682399B (en) | Display device, pixel driving circuit and driving method thereof | |
| US20200184902A1 (en) | Light-emitting display and method of driving the same | |
| US10672344B2 (en) | Display device displaying a plurality of patterns receiving luminance and color coordinates data for said patterns from an external user device | |
| JP2005115144A (en) | Method for driving pixel circuit, driver circuit electro-optical apparatus, and electronic device | |
| CN112259056B (en) | Display panel and brightness correction method | |
| US8847999B2 (en) | Display device, method for driving the same, and electronic unit | |
| CN113658554B (en) | Pixel driving circuit, pixel driving method and display device | |
| JP2007179037A (en) | El display apparatus and method for driving the el display apparatus | |
| CN114005405A (en) | Display panel and brightness compensation method thereof | |
| CN112785983A (en) | Display device | |
| CN103000124B (en) | Image element circuit, display floater, display unit and electronic system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |