CN111986602B - Burning method of display panel and display device - Google Patents
Burning method of display panel and display device Download PDFInfo
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- CN111986602B CN111986602B CN202010725299.2A CN202010725299A CN111986602B CN 111986602 B CN111986602 B CN 111986602B CN 202010725299 A CN202010725299 A CN 202010725299A CN 111986602 B CN111986602 B CN 111986602B
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
Abstract
The application provides a burning method and a display device of a display panel, wherein the display panel comprises a first display area and a second display area, the position of the second display area corresponds to the position of a fingerprint sensor, and the burning method comprises the following steps: adjusting and burning the gamma voltage of the display panel according to a target gamma curve; and obtaining and burning the gamma voltage corresponding to the maximum brightness of the second display area, so that the brightness of the second display area is increased when the fingerprint sensor at the position of the second display area works. Through the mode, the method and the device can replace the existing mode of transmitting the pictures by the covering layer, and simplify the operation processing of the terminal.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a burning method of a display panel and a display device.
Background
The full-screen has become a great trend of display devices such as mobile phones, and a design mode under the screen is generally adopted for a fingerprint sensor so as to improve the screen occupation ratio as much as possible. The design under the screen means that the fingerprint sensor is positioned under the display panel but does not influence the function of the display panel; when a user needs to unlock the fingerprint, a scheme of covering a layer to send a picture is generally adopted to highlight a display area corresponding to the fingerprint sensor.
However, the above-mentioned scheme of sending a drawing by using a single layer involves a relatively complex single layer algorithm, which increases the difficulty of implementing by a terminal manufacturer.
Disclosure of Invention
The application provides a burning method of a display panel and a display device, which can replace the existing mode of transmitting a drawing on a cover layer and simplify the operation processing of a terminal.
In order to solve the technical problem, the application adopts a technical scheme that: the burning method for the display panel is provided, the display panel comprises a first display area and a second display area, the position of the second display area corresponds to the position of the fingerprint sensor, and the burning method comprises the following steps: adjusting and burning the gamma voltage of the display panel according to a target gamma curve; and obtaining and burning the gamma voltage corresponding to the maximum brightness of the second display area, so that the brightness of the second display area is increased when the fingerprint sensor at the position of the second display area works.
In order to solve the above technical problem, the present application adopts another technical solution: provided is a display device including: a display panel including a first display region and a second display region; the fingerprint sensor is positioned on one side of the non-display surface of the display panel and corresponds to the second display area; the driving chip is connected with the display panel and used for driving the first display area and the second display area to display, and gamma voltages corresponding to the second display area with the maximum brightness are burnt in the driving chip, so that the display panel conforms to the gamma voltages of a target gamma curve; when receiving a working instruction of the fingerprint sensor, the driving chip inputs a gamma voltage corresponding to the burning maximum brightness of the second display area to the display panel, so that the brightness of the second display area is increased.
Being different from the prior art situation, the beneficial effect of this application is: this application can burn the gamma voltage when the second display area luminance that a set of fingerprint sensor corresponds is the biggest at display panel's burning record in-process to make follow-up fingerprint sensor during operation can directly call this gamma voltage, with the luminance of increase second display area position department, realize the fingerprint identification function. Compared with the method for transmitting the image by the cover layer in the prior art, the method does not need a complex cover layer algorithm, is simple in implementation process, and effectively reduces the data processing amount of the terminal.
In addition, in order to further improve the brightness of the second display area during fingerprint identification, the duty ratio of the light emitting control signal of the display panel can be pulled to the maximum. Because the luminous signal duty cycle is whole display panel simultaneous control, in order to reduce first display area luminance sudden change, take place the probability of twinkling of a screen, twinkling, this application still can burn in advance the multiunit and make first display area luminance maintain unchangeable gamma voltage, follow-up fingerprint unblock in-process directly call can to improve display effect and user experience.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be 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 diagram of an embodiment of a display panel;
FIG. 2 is a flowchart illustrating a method for burning a display panel according to an embodiment of the present disclosure;
FIG. 3a is a graph illustrating an embodiment of data voltages and brightness when a main display region and a sub display region after gamma voltage adjustment display a red-only image;
FIG. 3b is a graph illustrating data voltages and brightness when the gamma voltage adjusted primary and secondary display regions display a pure green image according to an embodiment;
FIG. 3c is a graph illustrating data voltages and brightness when the gamma voltage is adjusted and the main display area and the sub display area display a pure blue image according to an embodiment;
FIG. 4a is a diagram illustrating an embodiment of brightness adjustment register values and brightness of a first display area after fingerprint identification unlocking;
FIG. 4b is a diagram illustrating an embodiment of a brightness adjustment register value and a first display area brightness when fingerprint identification is unlocked;
FIG. 5 is a flowchart illustrating an embodiment corresponding to step S103 in FIG. 2;
FIG. 6 is a flowchart illustrating an embodiment corresponding to step S201 in FIG. 5;
FIG. 7 is a graph illustrating brightness and gray levels corresponding to different brightness adjusting register values according to one embodiment;
FIG. 8 is a schematic structural diagram of an embodiment of a display device according to the present application;
fig. 9 is a flowchart illustrating an embodiment of a method of operating a display device according to the present application.
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. The display panel 10 in the present application may include a first display area 100 and a second display area 102, and the position of the second display area 102 corresponds to the fingerprint sensor position. In the present embodiment, the second display region 102 may be at the lower end of the display panel 10, and may have a circular shape, an oval shape, or the like.
Generally, code data debugged in a design stage is temporarily stored in a driver chip of a display panel. Due to differences in manufacturing processes, the code data temporarily stored in the driver chip is difficult to be simultaneously applied to each batch of display panels, and therefore the code data in the driver chip needs to be adjusted and re-burned according to actual conditions before the display panels leave a factory. Referring to fig. 2, fig. 2 is a schematic flow chart illustrating an embodiment of a method for programming a display panel of the present application, the method comprising:
s101: and adjusting and burning the gamma voltage of the display panel according to the target gamma curve.
Generally, the brightness perceived by human eyes is not linear with the actual display brightness of the display panel. In low brightness environments, the human eye is more sensitive to changes in brightness, and in high brightness environments, the other way around. This property of the human eye is called gamma property. Due to the non-linear perception of brightness by human eyes, if we need to obtain a uniformly varying brightness perception, the brightness displayed by the display panel needs to be non-uniformly varied to adapt to the gamma characteristic of human eyes. The non-linear parameters of the brightness and gray scale of the display panel can be called gamma parameters, and the brightness and gray scale curve drawn according to the gamma parameters is called a gamma curve. The gamma parameter describes a non-linear relationship between luminance and gray scale, i.e., a non-linear relationship between luminance and gamma voltage. Therefore, if the brightness and gray scale of the display panel do not conform to the target gamma curve, the gamma voltage correction of the display panel is required. In the present embodiment, the target gamma curve may be a gamma curve having a gamma parameter of 2.2.
In an embodiment, a specific implementation process of the step S101 may be: A. acquiring gamma voltages corresponding to the characteristic gray scale binding points; the specific process can be as follows: on the display panel, adjusting the optical parameters corresponding to the characteristic gray scale binding points to target values to obtain gamma voltages corresponding to the adjusted characteristic gray scale binding points; B. according to the gamma voltages corresponding to the adjusted characteristic gray scale binding points, for example, the gamma voltages corresponding to other gray scale binding points except the characteristic gray scale binding points can be obtained by an interpolation method; C. inputting the gamma voltage of each gray scale binding point obtained in the last step into a display panel, testing to obtain a gamma curve of the display panel at the moment, and comparing the gamma curve with a target gamma curve; D. if so, finishing the adjustment and carrying out OTP burning; if not, fine adjustment is carried out on the gamma voltage of each gray scale binding point until a target gamma curve is met. Of course, in other embodiments, the specific tuning process of the step S101 may be other.
In another embodiment, referring to fig. 1 again, the first display area 100 provided in the present application may include a main display area 1000 and a sub display area 1002, where the position of the sub display area 1002 corresponds to the position of the camera module; in order to make the shooting effect of the camera module better, the light transmittance of the auxiliary display area 1002 can be larger than that of the main display area 1000; in one embodiment, the sub-display area 1002 may have a pixel density smaller than that of the main display area 1000, so as to achieve a purpose that the light transmittance of the sub-display area 1002 is greater than that of the main display area 1000. The sub-display area 1002 of the display panel 10 provided by the present application includes a plurality of second pixel driving circuits, and the main display area 1000 is provided with a plurality of third pixel driving circuits, where the second pixel driving circuits and the third pixel driving circuits may be different. For example, a second pixel driving circuit in the sub-display region 1002 can drive 4 sub-pixels to emit light, and a third pixel driving circuit in the main display region 1000 can drive 1 sub-pixel to emit light. The design mode makes the gamma voltages corresponding to the second pixel driving circuit and the third pixel driving circuit different under the same color brightness. Therefore, in order to ensure the consistency between the brightness and the color coordinates of the main display area 1000 and the sub display area 1002 when the camera module is not in operation, the step S101 specifically includes: gamma voltage adjustment and calibration are respectively carried out on the main display area 1000, the auxiliary display area 1002 and the second display area 102 according to a target gamma curve; the gamma voltages of the adjusted gray scale binding points respectively corresponding to the main display area 1000, the sub display area 1002 and the second display area 102 are subjected to OTP burning. For the process of adjusting the gamma voltages in the main display area 1000, the sub display area 1002, and the second display area 102, reference may be made to the above embodiments, and details are not repeated herein. When the pixel driving circuits in the main display area 1000 and the second display area 102 are the same, the gamma voltages of the main display area 1000 and the second display area 102 can be adjusted at the same time.
In an application scenario, please refer to fig. 3a to 3c, in which fig. 3a is a graph illustrating an embodiment of data voltages and luminances when the main display area and the sub display area after the gamma voltage adjustment display a pure red image, fig. 3b is a graph illustrating an embodiment of data voltages and luminances when the main display area and the sub display area after the gamma voltage adjustment display a pure green image, and fig. 3c is a graph illustrating an embodiment of data voltages and luminances when the main display area and the sub display area after the gamma voltage adjustment display a pure blue image. In which the data voltages are generated by the corresponding input gamma voltages, it can be seen from fig. 3a to 3c that in order to achieve the same display effect of the main display area and the sub display area, the sub display area can use a lower data voltage than the main display area. That is, fig. 3a to fig. 3c can prove the way of adjusting the gamma voltages of the main display area and the sub display area respectively, so that the display panel has the same brightness and color coordinates during normal display, thereby achieving a unified full-screen display effect. In this embodiment, a plurality of first pixel driving circuits may also be disposed in the second display region, and the first pixel driving circuits may be designed in the same manner as the third pixel driving circuits in the main display region, and at this time, the relationship between the data voltage and the luminance in the second display region may be the same as the relationship in the main display region.
S102: and obtaining and burning the gamma voltage corresponding to the maximum brightness of the second display area, so that the brightness of the second display area is increased when the fingerprint sensor at the position of the second display area works.
Compared with the method for transmitting the image by the cover layer in the prior art, the method does not need a complex cover layer algorithm, is simple in implementation process, and effectively reduces the data processing amount of the terminal.
In one embodiment, the step S102 specifically includes: and obtaining and burning the gamma voltage corresponding to the maximum driving current in the first pixel driving circuit in the second display area. When the PMOS transistor is used as the driving transistor in the first pixel driving circuit, the gamma voltage corresponding to the second display region can be adjusted to be minimum, and the data voltage generated by the gamma voltage is also minimum, so that the current in the first pixel driving circuit is maximum. When the NMOS transistor is used as the driving transistor in the first pixel driving circuit, the gamma voltage corresponding to the second display region can be regulated to the maximum, and the data voltage generated by the gamma voltage is also the maximum, so that the current in the first pixel driving circuit is the maximum. The method for obtaining and burning the gamma voltage corresponding to the maximum brightness of the second display area is simple and easy to realize.
In order to further improve the brightness of the second display area during fingerprint identification and improve the fingerprint identification effect, the duty ratio of the light-emitting control signal can be increased on the basis of enabling the driving current in the second display area to be maximum. Because the luminous signal duty cycle is whole display panel simultaneous control, in order to reduce first display area luminance sudden change, take place the probability of twinkling of a screen, twinkling, this application still can burn in advance the multiunit and make first display area luminance maintain unchangeable gamma voltage, follow-up fingerprint unblock in-process directly call can to improve display effect and user experience. The specific process may include S103: when the maximum driving current in the first pixel driving circuit is obtained and burned, a group of gamma voltages of the first display area are increased from the duty ratio of the first light-emitting control signal to the duty ratio of the second light-emitting control signal, but the brightness is kept unchanged; wherein, a set of gamma voltages corresponds to a first light-emitting control signal duty ratio, and a first light-emitting signal duty ratio corresponds to a brightness adjustment register value (i.e. 51 register values in the industry).
Preferably, the duty ratio of the second light-emitting control signal is 100%. The design mode can enable the brightness of the second display area at the position of the fingerprint sensor to be maximum during fingerprint identification, so that the fingerprint identification effect is guaranteed.
In an application scenario, please refer to fig. 4a, wherein fig. 4a is a schematic diagram illustrating an embodiment of a brightness adjustment register value and a brightness of the first display area after the fingerprint identification is unlocked. In this embodiment, the brightness adjustment register value may sequentially include: 060. 0FF, 2FF, 3FF, 4FF, 5FF, 6FF, 7FF, and the corresponding luminance values may be sequentially increased. After the fingerprint identification is unlocked, when the display panel works normally, when the display panel is in a low brightness range, for example, when the brightness adjusting register value is below FF, the duty ratio of the light-emitting control signal of the display panel can be kept unchanged, and the brightness is changed by changing the data voltage, wherein the data voltage is generated by the gamma voltage; when the display panel is in a high luminance range, for example, when the luminance adjustment register value is between FF to 7FF, the data voltage is maintained at a value that maximizes the current in the pixel driving circuit, and at this time, the luminance can be changed by adjusting the light emission control signal duty ratio, wherein the larger the light emission control signal duty ratio, the larger the luminance.
Returning to the design scheme in this application, in order to further improve the brightness of the second display region, the duty ratio of the light emission control signal of the display panel may be pulled to 100%, and as can be seen from fig. 4a, the brightness of the entire display panel may be improved at this time. In order to ensure that the brightness of the non-fingerprint area (i.e., the first display area) is not changed, the data voltage (i.e., the gamma voltage) may be changed to reduce the driving current in the first display area, thereby balancing the brightness variation caused by the duty ratio of the light-emitting control signal and achieving the effect of keeping the brightness of the non-fingerprint area unchanged. Specifically, referring to fig. 4b, fig. 4b is a schematic diagram of an embodiment of the brightness adjustment register value and the brightness of the first display area when the fingerprint identification is unlocked. As can be seen from fig. 4b, in the manner provided by the present application, when the fingerprint identification is unlocked, even if the duty ratio of the light-emitting signal is increased to 100%, the brightness at the same brightness adjustment register value position is maintained unchanged.
In one embodiment, please refer to fig. 5, wherein fig. 5 is a flowchart illustrating an embodiment corresponding to step S103 in fig. 2. The specific implementation process of step S103 may be:
s201: and obtaining gamma voltages of at least two characteristic gray scale bindings of the first display area under the current brightness adjusting register value.
S202: and performing linear interpolation by using the gamma voltages of at least two characteristic gray scale bindings to obtain the gamma voltages of other gray scale bindings, and further obtaining a group of gamma voltages corresponding to the current brightness adjusting register value.
The method for obtaining a set of gamma voltages corresponding to each brightness adjusting register value by using the linear interpolation method is simple and easy to implement. In this embodiment, the formula for linear interpolation can be expressed as:
wherein x is n-1 ＜x≤x n X is a gamma voltage, and y is brightness; when the gamma voltages at two characteristic gray level bindings and the target brightness are known, the gamma voltages at other gray level bindings can be obtained through derivation by the formula.
In one embodiment, please refer to fig. 6, wherein fig. 6 is a flowchart illustrating an embodiment corresponding to step S201 in fig. 5. The implementation process of the step S201 may be:
s301: and obtaining the gamma voltages of the first display area at the at least two characteristic gray scale binding points under the at least two characteristic brightness adjusting register values.
S302: and performing linear interpolation by using the gamma voltages at the same characteristic gray scale binding point under at least two characteristic brightness adjusting register values to obtain the gamma voltages at the same characteristic gray scale binding point under the current brightness adjusting register value.
The gamma voltage at the characteristic gray scale binding point under the known brightness adjusting register value can be used for linear interpolation processing to obtain the gamma voltage at the same characteristic gray scale binding point under the current brightness adjusting register value, and the method is simple and easy to implement.
In an application scenario, please refer to fig. 7, fig. 7 is a graph illustrating an embodiment of brightness and gray levels corresponding to different brightness adjustment register values. Assuming that the gamma curves L1 and L2 are respectively gamma curves corresponding to the first display area under the two characteristic brightness adjustment register values, the gamma voltages of the gray scale bindings corresponding to the gamma curve LX can be obtained by linear interpolation of the gamma voltages of the gray scale bindings corresponding to the gamma curves L1 and L2. For example, the obtaining process of the gamma voltages for the respective gray level ties corresponding to the gamma curve L1 may be: the gamma voltages at other gray level bindings can be obtained by linear interpolation using the known 128 gray level bindings and 255 gray level bindings. The process for obtaining the gamma curve LX may be: linear interpolation is carried out by utilizing the gamma voltages of the known gamma curve L1 and the gamma curve L2 at the 128 gray scale binding point to obtain the gamma voltage of the gamma curve LX at the 128 gray scale binding point; linear interpolation is carried out by utilizing the gamma voltages of the known gamma curve L1 and the gamma curve L2 at the 255 gray scale binding point to obtain the gamma voltage of the gamma curve LX at the 255 gray scale binding point; the gamma voltages at the other gray level tie points are obtained by linear interpolation of the gamma voltage at the 128 gray level tie point and the gamma voltage at the 255 gray level tie point using the gamma curve LX.
In another embodiment, when the first display area includes a main display area and a sub display area, and the position of the sub display area corresponds to the position of the camera module, the step S103 specifically includes: and respectively obtaining and burning the main display area and the auxiliary display area to enable the main display area and the auxiliary display area to maintain a group of gamma voltages with unchanged brightness when the duty ratio of the main display area and the auxiliary display area is increased from the duty ratio of the first light-emitting control signal to the duty ratio of the second light-emitting control signal. The design mode can reduce the brightness difference between the main display area and the auxiliary display area and improve the display effect.
In order to verify the effect of the above design scheme, a set of comparative examples and experimental examples are designed, wherein a set of gamma voltages for maintaining the brightness of the first display region unchanged when the duty ratio of the first light-emitting control signal is increased to 100% are not programmed in the comparative examples, and a set of gamma voltages for maintaining the brightness of the first display region unchanged when the duty ratio of the first light-emitting control signal is increased to 100% are programmed in the experimental examples. When the fingerprint identification function is turned on, the duty ratio of the light emitting control signals of the main display area and the auxiliary display area reaches 100%. As shown in tables 1 and 2 below, in the experimental example, when the fingerprint identification function is turned on and off, due to the effect of the gamma voltage that is burned to make the brightness unchanged, the brightness of each of the main display area and the sub display area is not changed basically, and the brightness difference between the main display area and the sub display area is small. And the comparative example changes the respective brightness of the main display area and the sub display area when the fingerprint recognition function is turned on and off.
Table 1 experimental examples luminance tables of main display area and sub display area under different luminance adjustment register values at the time of switching of fingerprint identification function
Table 2 comparison example luminance tables of main display area and sub display area under different luminance adjustment register values at the time of switching of fingerprint recognition function
In addition, in other embodiments, the burning method provided by the present application further includes: and obtaining and burning a group of gamma voltages corresponding to the complete black of the auxiliary display area, so that the complete black of the auxiliary display area is realized when the camera module at the position of the auxiliary display area works. This design can make the module during operation of making a video recording of follow-up vice display area position department, and gamma voltage when can directly transferring this vice display area complete blackness shows to make vice display area complete blackness, the module of making a video recording can normally work. The method only needs to add one step of burning in the burning process, thereby saving the production line working hour. Compared with the image sending mode in the prior art, the method has the advantages of low calculated amount and accurate positioning of the auxiliary display area.
In an application scenario, the burning of the sub-display area full black gamma voltage may include: A. and inputting the gamma voltage corresponding to the minimum driving current in the second pixel driving circuit in the secondary display area to the data line of the second pixel driving circuit, and driving the secondary display area to display. Specifically, when the PMOS transistor is used as the driving transistor in the second pixel driving circuit, the gamma voltage corresponding to the sub-display region can be adjusted to be maximum, and the data voltage generated by the gamma voltage is also maximum, so that the current in the second pixel driving circuit is zero. When the second pixel driving circuit adopts the NMOS transistor as the driving transistor, the gamma voltage corresponding to the sub-display region can be adjusted to be minimum, and the data voltage generated by the gamma voltage is also minimum, so that the current in the second pixel driving circuit is zero.
B. And receiving the brightness of the current auxiliary display area obtained by the optical lens test.
C. And if the brightness of the current auxiliary display area is zero, taking the gamma voltage corresponding to each second pixel driving circuit in the current auxiliary display area as the gamma voltage corresponding to the total black of the auxiliary display area, and performing OTP burning.
The above process can ensure the correctness of the gamma voltage which is burnt to make the sub display area completely black. And simultaneously with the step C: and if the brightness of the current sub-display area is not zero, checking the gamma voltage input in the step A to eliminate the condition that the brightness of the sub-display area is not zero due to the gamma voltage input error.
In another embodiment, before the step S101, in order to obtain an accurate gamma voltage calibration result and a better display effect, the programming method further includes: performing voltage drop compensation adjustment on the display panel to obtain voltage drop values required to be compensated by at least part of the sub-pixels; inputting the voltage drop value to be compensated of at least part of the sub-pixels into the display panel and driving the display panel to display; receiving the brightness of the display panel obtained by testing the optical lens; and if the brightness of the main display area and the brightness of the auxiliary display area of the display panel are consistent, the current voltage drop value is subjected to OTP burning. In practical situations, the power trace inevitably has impedance, and when a current flows through the power trace, a voltage drop is generated at two ends of the power trace, so that the voltages at the power ends of the sub-pixels are different, which affects the brightness uniformity of the display image. The voltage drop can be compensated through the burning process, so that the brightness of the display panel is uniform, and the display effect is improved. And on the premise of uniform brightness of the display panel, the process of adjusting the gamma voltage is more accurate.
Further, before performing voltage drop compensation adjustment on the display panel to obtain a voltage drop value to be compensated for at least a part of the sub-pixels, the programming method provided by the present application further includes: and carrying out OTP burning on the verified codes related to the fillet and the special-shaped display. The purpose of this step is to ensure that the burned code is the same as the code originally designed in the laboratory.
In addition, in other embodiments, after the step S103, the burning method provided by the present application further includes: and performing OTP burning on the verified other page registers and/or other voltages related to the display panel. Wherein the other page registers may include FPR registers, etc., and the other voltages may include power supply voltages, etc. The above design method can make the content burned in the driving chip as complete as possible, and the design method after the step S103 of the above burning process can improve the burning efficiency.
In a specific application scenario, the burning method of the display panel includes:
A. the display panel is lighted up, and all the codes can be input into the display panel, and the display panel displays a preset picture, wherein the preset picture can be a pure color or a color picture.
B. And carrying out OTP burning on the verified codes related to the round corners and the special-shaped display.
C. And carrying out OTP burning on the verified voltage drop value needing to be compensated.
D. And performing OTP burning on the gamma voltage obtained after the display panel is adjusted according to the target gamma curve.
E. And burning the gamma voltage corresponding to the maximum brightness of the second display area.
F. Respectively obtaining and burning a main display area and an auxiliary display area in the first display area to enable the main display area and the auxiliary display area to maintain a group of gamma voltages with unchanged brightness when the duty ratio of the first light-emitting control signal is increased to the duty ratio of the second light-emitting control signal;
G. and burning the gamma voltage corresponding to the complete black of the auxiliary display area.
H. And burning the verified other page registers and/or other voltages related to the display panel.
The burning process has good efficiency, and the display effect of the display panel is good finally.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a display device 20 of the present application, which includes a display panel 200, a fingerprint sensor 202 and a driving chip (not shown).
Among them, the display panel 200 includes a first display area 2000 and a second display area 2002. The fingerprint sensor 202 is located on the non-display surface 2004 side of the display panel 200 and corresponds to the second display area 2002. The driving chip is connected to the display panel 200, and is configured to drive the first display area 2000 and the second display area 2002 to display, and a gamma voltage corresponding to the maximum brightness of the second display area 2002 and a gamma voltage enabling the display panel 200 to conform to a target gamma curve are recorded in the driving chip; when receiving the operating instruction of the fingerprint sensor 202, the driving chip inputs the gamma voltage corresponding to the maximum brightness of the second display area 2002 to the display panel 200, so that the brightness of the second display area 2002 is increased.
Further, in order to maximize the brightness of the second display area 2002, after the driving chip receives the operating instruction of the fingerprint sensor 202, the duty ratio of the light emitting signal of the display panel 200 is further maximized, and a set of gamma voltages corresponding to the current brightness adjusting register value and enabling the brightness of the first display area 2000 to be unchanged is called. For example, if the current brightness adjustment register value of the display device 20 is 6FF, a set of gamma voltages that make the brightness of the current brightness adjustment register value unchanged corresponding to the 6FF is called.
In yet another embodiment, referring to fig. 8 again, the first display region 2000 includes a main display region 20000 and a sub-display region 20002, and the sub-display region 20002 has a light transmittance greater than that of the main display region 20000. The display device 20 may further include a camera module 204 located on the non-display surface 2004 side of the display panel 200 and corresponding to the sub-display area 20002. The gamma voltage for making the sub-display area 20002 completely black is programmed in the driving chip, and when the driving chip receives a working instruction of the camera module 204, the programmed gamma voltage for making the sub-display area 20002 completely black is input to the display panel 200, so that the sub-display area 20002 completely black.
In an application scenario, a packet function is provided in the driver chip, and the packet function can be called when the driver chip receives a working instruction of the camera module 204 to obtain a gamma voltage which is recorded to make the sub-display area 20002 completely black, so that the sub-display area 20002 is closed by one key, and an optimal shooting effect is achieved.
In another embodiment, when the image capturing module 204 is not in operation or when the fingerprint sensor 202 is not in operation, the driving chip respectively calls the gamma voltage that is burned to make the main display area 20000 conform to the target gamma curve and the gamma voltage that makes the sub display area 20002 conform to the target gamma curve for displaying, so that the main display area 20000 and the sub display area 20002 have the same brightness and color coordinates. In this embodiment, the display device 20 can sense the brightness of the external environment, perform corresponding brightness adjustment according to different setting modes, and call the gamma voltage for linking the main display area 20000 and the sub-display area 20002, so that the display panel 200 has the same brightness and color coordinates, thereby realizing real full-screen display.
Referring to fig. 9, fig. 9 is a schematic flowchart illustrating an embodiment of a working method of a display device according to the present application, the working method including:
s401: and responding to a work instruction of fingerprint identification, and calling the gamma voltage corresponding to the maximum brightness of the second display area at the position of the burnt fingerprint sensor so as to increase the brightness of the second display area.
In order to further improve the fingerprint identification effect and maximize the brightness of the second display area during fingerprint identification, the working method provided by the application further comprises the following steps: and responding to a working instruction of fingerprint identification, enabling the duty ratio of a light-emitting control signal of the display panel to be maximum, and calling a group of gamma voltages which are recorded and correspond to the current brightness adjusting register value and enable the brightness of the first display area to be unchanged.
In another embodiment, when the display device includes a camera module, the workflow of the camera module may be: responding to a working instruction of the camera module, and calling a gamma voltage which is burnt and enables a secondary display area of the display panel to be completely black so as to enable the secondary display area to be completely black; wherein, the position of the camera module corresponds to the position of the auxiliary display area. Specifically, the gamma voltage for making the sub-display area completely black can be obtained by calling a preset encapsulation function.
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 (10)
1. A burning method of a display panel comprises a first display area and a second display area, wherein the first display area comprises a main display area and an auxiliary display area, and the position of the second display area corresponds to the position of a fingerprint sensor, and the burning method comprises the following steps:
performing voltage drop compensation adjustment on the display panel to obtain voltage drop values required to be compensated for at least part of the sub-pixels; inputting the voltage drop value to be compensated of at least part of the sub-pixels into the display panel and driving the display panel to display; receiving the brightness of the display panel obtained by testing the optical lens; if the brightness of the main display area and the brightness of the auxiliary display area of the display panel are consistent, burning the current voltage drop value;
adjusting and burning the gamma voltage of the display panel according to a target gamma curve;
and obtaining and burning the gamma voltage corresponding to the maximum brightness of the second display area, so that when the fingerprint sensor at the position of the second display area works, the gamma voltage corresponding to the burning time when the brightness of the second display area is maximum is called, and the brightness of the second display area is increased.
2. The programming method of claim 1, wherein the second display area includes a plurality of first pixel driving circuits therein, and the obtaining and programming gamma voltages corresponding to the maximum brightness of the second display area comprises:
and obtaining and burning the gamma voltage corresponding to the maximum driving current in the first pixel driving circuit.
3. The method as claimed in claim 2, wherein after obtaining and programming the gamma voltage corresponding to the maximum driving current in the first pixel driving circuit, further comprising:
when the maximum driving current in the first pixel driving circuit is obtained and burned, a group of gamma voltages of the first display area, which is increased from the duty ratio of the first light-emitting control signal to the duty ratio of the second light-emitting control signal but keeps the brightness unchanged, are obtained and burned; wherein, a group of gamma voltages corresponds to a duty ratio of the first light-emitting control signal, and a duty ratio of the first light-emitting control signal corresponds to a brightness adjusting register value.
4. The burning method as claimed in claim 3,
the duty ratio of the second light-emitting control signal is 100%.
5. The method as claimed in claim 3, wherein obtaining and programming a set of gamma voltages for increasing the duty cycle of the first display area from the first emission control signal to the duty cycle of the second emission control signal while maintaining the same brightness when the maximum driving current in the first pixel driving circuit is obtained comprises:
obtaining gamma voltages of at least two characteristic gray scale bindings of the first display area under the current brightness adjusting register value;
and performing linear interpolation by using the gamma voltages of the at least two characteristic gray scale binding points to obtain gamma voltages of other gray scale binding points, and further obtaining a group of gamma voltages corresponding to the current brightness adjusting register value.
6. The burning method of claim 5, wherein the obtaining the gamma voltages of at least two characteristic gray scale bindings at the current brightness adjustment register value comprises:
obtaining gamma voltages of the first display area at least two characteristic gray scale binding points under at least two characteristic brightness adjusting register values;
and performing linear interpolation by using the gamma voltages at the same characteristic gray scale binding point under the at least two characteristic brightness adjusting register values to obtain the gamma voltages at the same characteristic gray scale binding point under the current brightness adjusting register value.
7. The programming method of claim 3, wherein the position of the sub-display area corresponds to a position of a camera module, and the obtaining and programming of the set of gamma voltages in the first pixel driving circuit that increases the duty cycle of the first display area from the duty cycle of the first emission control signal to the duty cycle of the second emission control signal while maintaining the brightness unchanged when the driving current in the first pixel driving circuit is the maximum comprises:
and respectively obtaining and burning the main display area and the auxiliary display area to enable the main display area and the auxiliary display area to maintain a group of gamma voltages with unchanged brightness when the duty ratio of the first light-emitting control signal is increased to the duty ratio of the second light-emitting control signal.
8. The burning method of claim 7, further comprising:
and obtaining and burning a group of gamma voltages corresponding to the complete black of the auxiliary display area, so that the complete black of the auxiliary display area is realized when the camera module at the position of the auxiliary display area works.
9. A display device, comprising:
a display panel including a first display region and a second display region, the first display region including a main display region and a sub display region;
the fingerprint sensor is positioned on one side of the non-display surface of the display panel and corresponds to the second display area;
the driving chip is connected with the display panel and used for driving the first display area and the second display area to display, and gamma voltages corresponding to the second display area with the maximum brightness are burnt in the driving chip, so that the display panel conforms to the gamma voltages of a target gamma curve; before burning the gamma voltage corresponding to the maximum brightness of the second display area, the driving chip performs voltage drop compensation adjustment on the display panel to obtain a voltage drop value required to be compensated by at least part of the sub-pixels; inputting the voltage drop value to be compensated by at least part of the sub-pixels into the display panel and driving the display panel to display; receiving the brightness of the display panel obtained by testing the optical lens; if the brightness of the main display area and the brightness of the auxiliary display area of the display panel are consistent, burning the current voltage drop value; when receiving a working instruction of the fingerprint sensor, the driving chip inputs a gamma voltage corresponding to the burning maximum brightness of the second display area to the display panel, so that the brightness of the second display area is increased.
10. The display device according to claim 9,
and after receiving the working instruction of the fingerprint sensor, the driving chip further enables the duty ratio of the light-emitting signal of the display panel to be the highest, and calls a group of gamma voltages which are recorded and correspond to the current brightness adjusting register value and enable the brightness of the first display area to be unchanged.
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| CN114420031B (en) * | 2022-01-30 | 2023-12-26 | 京东方科技集团股份有限公司 | Display panel and driving method thereof |
| CN116991436A (en) * | 2023-08-21 | 2023-11-03 | 上海傲显科技有限公司 | Multi-gamma burning method and storage medium |
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| CN105096834A (en) * | 2015-08-26 | 2015-11-25 | 京东方科技集团股份有限公司 | Active-matrix organic light-emitting diode (AMOLED) display apparatus and brightness compensation method thereof |
| CN110880295A (en) * | 2018-09-06 | 2020-03-13 | 上海和辉光电有限公司 | Voltage drop compensation method and system of AMOLED display panel |
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| CN102426816B (en) * | 2011-11-19 | 2014-04-02 | 昆山工研院新型平板显示技术中心有限公司 | Method for repairing bad display of active-matrix organic light-emitting display |
| CN106098013A (en) * | 2016-08-23 | 2016-11-09 | 京东方科技集团股份有限公司 | A kind of driving method showing module and driving means, display device |
| CN108172150B (en) * | 2017-12-14 | 2021-01-26 | 京东方科技集团股份有限公司 | Display screen detection method and device |
| CN108766975B (en) * | 2018-04-28 | 2021-02-02 | 上海天马有机发光显示技术有限公司 | Display panel and electronic equipment |
| CN109166559B (en) * | 2018-11-09 | 2020-08-28 | 重庆先进光电显示技术研究院 | Gamma value debugging method and device for display panel |
| CN109256090B (en) * | 2018-11-16 | 2020-05-05 | 京东方科技集团股份有限公司 | Display picture adjusting method, display panel and display device |
| CN109545132A (en) * | 2018-11-26 | 2019-03-29 | 昆山国显光电有限公司 | Shield body display methods, display screen and electronic equipment |
| CN110231735B (en) * | 2019-05-16 | 2023-08-22 | 武汉华星光电技术有限公司 | display device |
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| CN105096834A (en) * | 2015-08-26 | 2015-11-25 | 京东方科技集团股份有限公司 | Active-matrix organic light-emitting diode (AMOLED) display apparatus and brightness compensation method thereof |
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