CN113383383A

CN113383383A - Gamma debugging method and device for display module

Info

Publication number: CN113383383A
Application number: CN201980090090.9A
Authority: CN
Inventors: 张肖; 郭星灵; 周锦杰
Original assignee: Shenzhen Royole Technologies Co Ltd
Current assignee: Shenzhen Royole Technologies Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2021-09-10
Also published as: WO2021007819A1

Abstract

A Gamma debugging method of a display module comprises the following steps: obtaining the actual current value flowing through the display module at present according to the gray scale signal; comparing the actual current value with a target current value corresponding to the gray scale signal; and adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value. The embodiment of the application also discloses a Gamma debugging device of the display module.

Description

Gamma debugging method and device for display module

Technical Field

The application relates to the technical field of display, in particular to a Gamma debugging method and a Gamma debugging device of a display module.

Background

Existing displays, such as liquid crystal displays or OLED displays, typically include thin film transistors. Due to the manufacturing process of the display screen, characteristics of the thin film transistors or other components of the display screen are inconsistent, for example, threshold voltages of the thin film transistors are different, so that even though voltages applied to the thin film transistors are consistent, brightness of all parts of the display screen is still inconsistent.

In order to reduce the problem of inconsistent brightness of various parts of the display screen, the prior art generally debugs gamma to make the brightness meet the requirement. The conventional gamma debugging method needs to use a plurality of external devices, please refer to fig. 1, a color analyzer, an external computer, debugging software and the like, and the brightness, the color and the like of the display screen meet the requirements through the steps of measurement, feedback, correction and the like. However, in the debugging process, the measurement error of the color analyzer gradually increases along with the reduction of the brightness, and the brightness deviation allowed by Gamma debugging gradually decreases along with the increase of the brightness, so that the Gamma debugging is difficult at a low gray level due to the contradiction between the two methods; moreover, Gamma debugging needs to be adjusted by means of external instruments, the debugging process is complicated, more instruments are needed, the debugging result is inevitable, errors exist, and the cost is high.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present application is to provide a Gamma debugging method and a Gamma debugging device for a display module, which can accurately and quickly debug Gamma brightness without using an instrument. .

An embodiment of a first aspect of the present application provides a Gamma debugging method for a display module, including:

obtaining the actual current value flowing through the display module at present according to the gray scale signal;

comparing the actual current value with a target current value corresponding to the gray scale signal;

and adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value.

An embodiment of a second aspect of the present application provides a Gamma debugging apparatus for a display module, including:

the detection module is used for obtaining the current value of the actual current flowing through the display module according to the gray scale signal;

the comparison module is used for comparing the actual current value with a target current value corresponding to the gray scale signal;

and the digital gamma control module is used for adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value.

The embodiment of the application has the following beneficial effects:

the display module can complete the debugging of Gamma by means of the design of the display module, so that the display uniformity of the display module is better; the Gamma debugging method solves the problems that debugging equipment is too much and the preparation process before debugging is complex in the debugging scheme in the prior art; the debugging can be completed by utilizing the internal framework of the display module without debugging equipment, the operation is convenient, and the cost is lower; moreover, the relation between the current and the brightness when the OLED device emits light and the voltage and current characteristics of the driving thin film transistor are fully analyzed, debugging is carried out on the basis of theoretical calculation, the debugging process is simple, and the debugging speed is high; in addition, the problems of insufficient debugging precision, large debugging error and the like caused by the reasons of debugging instruments such as a color analyzer and the like in the prior art are fully solved, and the accurate debugging of the brightness can be realized by utilizing the current-brightness characteristic curve of the OLED device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art OLED display screen for gamma debugging;

fig. 2 is a flowchart of a Gamma adjustment method of a display module according to an embodiment of the present application;

fig. 3 is a schematic diagram of a Gamma debugging apparatus of a display module according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.

The embodiment of the application provides a Gamma debugging method for a display module, the display module is an OLED display module, the OLED display module comprises an OLED display panel, the OLED display panel comprises a plurality of R sub-pixels, a plurality of B sub-pixels and a plurality of G sub-pixels, and each sub-pixel comprises an OLED (Organic Light-Emitting Diode) device and a driving thin film transistor. The anode of the OLED device is electrically connected with the drain of the driving thin film transistor, the cathode of the OLED device is electrically connected with the second power signal line, the voltage transmitted on the second power signal line is low-level voltage, the source of the driving thin film transistor is electrically connected with the first power signal line, the voltage transmitted on the first power signal line is high-level voltage, and the gate of the driving thin film transistor is electrically connected with the data line. Referring to fig. 2, in the present embodiment, the Gamma adjustment method of the display module includes steps S110 to S170. In addition, in other embodiments of the present application, the Gamma adjustment method of the display module may further include only steps S150 to S170, but not steps S110 to S140.

S110: and storing a gray scale-register value initial correspondence table and a gray scale-target current value correspondence table, wherein each gray scale in the initial correspondence table corresponds to a register value one by one, each gray scale in the gray scale-target current value correspondence table corresponds to a target current value one by one, and the register value corresponds to the driving voltage one by one.

In this embodiment, after the maximum white brightness and the color coordinates that may be used by the display module are determined, the brightness of the highest gray scale of the R sub-pixel, the G sub-pixel, and the B sub-pixel of the display panel can be determined, and then the target brightness of each gray scale can be calculated from the brightness of the highest gray scale of the R sub-pixel, the G sub-pixel, and the B sub-pixel. In the present embodiment, the Gray scale number of the R sub-pixel, the G sub-pixel and the B sub-pixel is 256, i.e., Gray0-Gray 255. In the OLED display module, the target luminance and the target current value have a linear relationship, so that a target current value corresponding to each gray scale can be calculated, and a gray scale-target current value correspondence table can be obtained, see table 1 below, where table 1 is a gray scale-target current value correspondence table of the R sub-pixel, a gray scale-target current value correspondence table of the G sub-pixel, and a gray scale-target current value correspondence table of the B sub-pixel are similar to the gray scale-target current value correspondence table of the R sub-pixel, and are not represented by a graph. In the present embodiment, three gray scale-target current value mapping tables are pre-stored in the display module.

Gray scale	Target current
GrayR0	IR0
GrayR1	IR1
…	…
GrayR255	IR255

TABLE 1

In the present embodiment, there are a plurality of register values in the OLED display module, and in the present embodiment, the number of the register values is assumed to be 1024, for example, 0 to 1023, but other numbers may be used. Each register value corresponds to a unique driving voltage, i.e. 1024 driving voltages, for example V0-V1023, register value 0 corresponds to driving voltage V0, …, and register value 1023 corresponds to driving voltage V1023. Among 1024 driving voltages, the highest driving voltage V1023 is the highest voltage of the gamma voltage, generally 5V, the lowest driving voltage V0 is the lowest voltage of the gamma voltage, generally 0V, and is divided into 1023 parts (excluding the lowest driving voltage), where the voltage interval Vstep of each adjacent two driving voltages of the 1023 parts is the same, the voltage interval Vstep is equal to the lowest voltage of the gamma voltage minus the gamma voltage, and then is divided by 1023, that is, Vstep is (V1023-V0)/1023, for example, the voltage interval Vstep is 0.0049V, and the driving voltages are finally output to the data line.

According to table 1, each gray scale of each sub-pixel corresponds to a target current value one to one, after the target current value corresponding to each gray scale is determined, the theoretical driving voltage required by each target current value of each sub-pixel can be determined according to the theoretical parameters of the driving thin film transistor (i.e. without considering the manufacturing errors of the driving thin film transistor and other components), for example, without considering the theoretical threshold voltage difference of the driving thin film transistor, etc., according to the calculation formula of driving voltage-target current value, after the theoretical driving voltage is obtained by calculation, the driving voltage closest to the calculated theoretical driving voltage is selected from the 1024 driving voltages in the upper segment, the driving voltage corresponds to the target current value, since the driving voltage corresponds to the register value one to one, and the target current value corresponds to the gray scale one to one, the one to one correspondence of the register value can be obtained, please refer to table 2 below, wherein table 2 is a gray scale-register value initial mapping table of the R sub-pixel, a gray scale-register value initial mapping table of the G sub-pixel, and a gray scale-register value initial mapping table of the B sub-pixel, which are similar to the gray scale-register value initial mapping table of the R sub-pixel and are not represented by a table. In the embodiment, three gray-level-register value initial mapping tables are stored in the display module, and the three initial mapping tables are calculated based on an ideal condition, which does not consider the process error and the like. In this embodiment, since the OLED display panel has differences in the driving tfts at various positions during the manufacturing process, so as to cause uneven display, in order to overcome the uneven display, the gray-level-register value initial mapping table needs to be adjusted, where the 0 th gray level is completely black and corresponds to the 0 th register value (the driving voltage corresponding to the 0 th register value is the lowest voltage), and no adjustment is needed.

Gray scale	Register value
GrayR0	0
GrayR1	3
GrayR2	6
…	…
GrayR255	1020

TABLE 2

S120: obtaining a gray scale signal for debugging;

in this embodiment, when the debugging is performed at the beginning, a user or a worker needs to trigger manually, a gray scale signal may be triggered by hardware, a gray scale signal may be triggered by software, or a gray scale signal may be triggered automatically by other methods, where the gray scale signal includes information for performing Gamma debugging on a certain gray scale, for example, information for performing debugging on the nth gray scale; when the debugging process is in progress, for example, the n-1 th gray scale is debugged in the foregoing, the gray scale signal for debugging the n-th gray scale can be automatically triggered. After triggering, the display module obtains a gray scale signal for debugging the nth gray scale, wherein the signal can be a voltage signal, a current signal or other signals. In the present embodiment, the gray scale signal is, for example, a gray scale signal for debugging an nth gray scale, wherein the nth gray scale is greater than the 0 th gray scale and less than or equal to a highest gray scale, and in the present embodiment, the highest gray scale is a 255 th gray scale, that is, the nth gray scale is less than or equal to the 255 th gray scale.

Here, the gray-scale signal belongs to an X sub-pixel, wherein the X sub-pixel is one of an R sub-pixel, a G sub-pixel, and a B sub-pixel. For convenience of description, the X sub-pixel is taken as an example of the R sub-pixel in the present embodiment.

S130: obtaining a corresponding register value according to the gray scale signal, obtaining a corresponding driving voltage according to the register value, and obtaining a target current value corresponding to the gray scale signal from a gray scale-target current value correspondence table;

in this embodiment, it can be known from the grayscale signal that the nth grayscale of the X sub-pixel is debugged, and then the register value corresponding to the nth grayscale can be obtained through the grayscale-register value initial mapping table, and since the register value and the driving voltage form a one-to-one correspondence relationship, the corresponding driving voltage Vx can be obtained, where X is a positive integer and X is not more than 1023. Furthermore, after the nth gray scale is known, the target current value In corresponding to the nth gray scale can be obtained from the gray scale-target current value correspondence table.

S140, driving a display panel of the display module by the driving voltage;

in this embodiment, after obtaining the driving voltage Vx according to the gray scale signal, the display module transmits the driving voltage Vx to the gate of the driving thin film transistor through the data line, and then drives the display panel of the display module, and the OLED device can emit light, so that the display panel of the display module can emit light. In this embodiment, all the OLED devices in all the sub-pixels on the display panel of the display module can emit light, or only one sub-pixel can emit light. In this embodiment, all kinds of OLED devices in the sub-pixels emit light, that is, all the OLED devices in the R sub-pixel, the G sub-pixel, and the B sub-pixel are driven by the driving voltage and all emit light, and at this time, the image displayed by the display panel is a white image.

S150: obtaining the actual current value flowing through the display module at present according to the gray scale signal;

in this embodiment, after the display panel is driven, a current flows through the OLED device, and the display module obtains an actual current value of the OLED device currently flowing through the display panel, where the actual current value is actually obtained by the display module in a current sampling manner, and the specific current sampling manner is a conventional technique in the art and is not described herein again.

S160: comparing the actual current value with a target current value corresponding to the gray scale signal;

in this embodiment, after the actual current value is obtained by detection, and the gray-scale signal corresponding to a certain gray scale is determined, the target current value corresponding to the gray-scale signal can be obtained according to the gray-scale-target current value correspondence table, and then the display module compares the actual current value with the target current value corresponding to the gray-scale signal. In addition, in other embodiments of the present application, the target current value may also be transmitted from the outside to the display module, and is calculated by the operator and input to the display module.

S170: and adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value.

In this embodiment, the display module stores a predetermined range in advance, where the predetermined range is [ c, d ], where c is a negative number and d is a positive number. After the actual current value is obtained, the display module compares the actual current value with the target current value, if the difference between the actual current value and the target current value is outside a preset range, it indicates that the difference is within an unacceptable range, at this time, the actual current value does not meet the requirement, correspondingly, the light emission of the OLED device does not meet the requirement, and the corresponding driving voltage needs to be adjusted. Specifically, when the actual current value is greater than the target current value, the register value corresponding to the current value needs to be reduced, that is, the register value corresponding to the current value needs to be reduced less than the register value corresponding to the current value, and when the actual current value is less than the target current value, the register value corresponding to the current value needs to be increased, that is, the register value corresponding to the current value needs to be increased more than the register value corresponding to the current value. And then, storing the register value corresponding to the adjusted gray scale signal. Then, returning to step S150, at this time, the register value corresponding to the nth gray scale is the adjusted register value, instead of the original corresponding register value, and then steps S160 and S170 are performed until the difference between the actual current value and the target current value is within the preset range, at this time, the register corresponding to the nth gray scale does not need to be adjusted again.

In this embodiment, the step of adjusting the register value corresponding to the gray-scale signal according to the difference between the actual current value and the target current value specifically includes: if the result of subtracting the target current value from the actual current value is larger than the upper limit of the preset range, subtracting a from the register value corresponding to the gray scale signal to obtain a new corresponding register value, wherein a is an integer of 1-5; and if the result of subtracting the target current value from the actual current value is less than the lower limit of the preset range, increasing b by the register value corresponding to the gray scale signal to obtain a new corresponding register value, wherein b is an integer of 1-5. In this embodiment, for the same nth gray level, if the results of the previous debugging are all larger than the upper limit of the preset range, a at this time may be maintained to be a relatively large value, for example, 4, 5, and then, after the previous debugging for the nth gray level, if the result of subtracting the target current value from the actual current value becomes smaller than the lower limit of the preset range, the value of b at this time is smaller than the value of a and is a relatively small value, for example, b is 3, and then, if the result of subtracting the target current value from the actual current value becomes larger than the upper limit of the preset range, the value of a at this time is smaller than the value of b at the previous debugging, for example, a is 2, and then, the debugging is continued according to such logic until the result of subtracting the target current value from the actual current value is within the preset range. By means of the setting, the register value corresponding to the nth gray scale can quickly reach the register value which finally meets the requirement. Of course, if the opposite is also possible, that is, for the debugging of the same nth gray scale, if the debugging results obtained from the previous times of debugging are all smaller than the lower limit of the preset range, b at this time may be maintained to be a relatively large value, for example, 4 or 5, then if the result of subtracting the target current value from the actual current value becomes larger than the upper limit of the preset range, the value of a at this time is smaller than the value of b in the previous debugging, for example, a is 3, then if the result of subtracting the target current value from the actual current value becomes smaller than the lower limit of the preset range, the value of b at this time is smaller than the value of a in the previous debugging, for example, b is 2, and then the debugging is continued according to such logic until the result of subtracting the target current value from the actual current value is within the preset range. By means of the setting, the register value corresponding to the nth gray scale can quickly reach the register value which finally meets the requirement. In addition, in other embodiments of the present application, the difference between the result of subtracting the target current value from the actual current value and the upper limit or the lower limit of the preset range may be adjusted to be within the preset range at one time according to the difference. For example, if the result of subtracting the target current value from the actual current value is higher than the upper limit of the preset range by 0.2mA, 2 register values corresponding to each phase difference of 0.1mA are designed in advance, and at this time, 4 register values are adjusted according to the difference between the result of subtracting the target current value from the actual current value and the upper limit, that is, a new register value can be obtained by subtracting 4 from the original register value, and the new register value meets the requirement; if the result of subtracting the target current value from the actual current value is lower than the lower limit of the preset range by 0.2mA, 2 register values corresponding to each phase difference of 0.1mA are designed in advance, at the moment, 4 register values are adjusted according to the difference between the result of subtracting the target current value from the actual current value and the lower limit, namely, a new register value can be obtained by adding 4 to the original register value, and the new register value meets the requirement.

In this embodiment, if the difference between the actual current value and the target current value is within the preset range, it indicates that the difference is within an acceptable range, and the actual current value is satisfactory, so that the corresponding driving voltage does not need to be adjusted, that is, the corresponding register value does not need to be adjusted, and at this time, the nth gray scale and the corresponding register value do not need to be adjusted, and the register value corresponding to the gray scale signal is maintained, and at this time, the register value is the final register value.

In this embodiment, the display module simultaneously debugs gammas of the R, G, and B sub-pixels, that is, simultaneously adjusts gray scale-register value correspondence of the R, G, and B sub-pixels, wherein the debugs of the R, G, and B sub-pixels may be the same or different when debugging, for example, the R sub-pixel debugs the nth gray scale, the G sub-pixel debugs the mth gray scale, and the B sub-pixel debugs the kth gray scale, wherein the 0 th gray scale is less than the mth gray scale, the kth gray scale is less than or equal to the highest gray scale, and m and k are positive integers, and n, m, and k may be the same or different. In addition, in other embodiments of the application, the display module may also debug the gammas of the R sub-pixel, the G sub-pixel, and the B sub-pixel, respectively, that is, the Gamma debugging of the R sub-pixel, the G sub-pixel, and the B sub-pixel is performed in a time-sharing manner.

The display module of the embodiment can complete the debugging of Gamma by means of the design of the display module, so that the display uniformity of the display module is better; the Gamma debugging method solves the problems that debugging equipment is too much and the preparation process before debugging is complex in the debugging scheme in the prior art; the debugging can be completed by utilizing the internal framework of the display module without debugging equipment, the operation is convenient, and the cost is lower; moreover, the relation between the current and the brightness when the OLED device emits light and the voltage and current characteristics of the driving thin film transistor are fully analyzed, debugging is carried out on the basis of theoretical calculation, the debugging process is simple, and the debugging speed is high; in addition, the problems of insufficient debugging precision, large debugging error and the like caused by the reasons of debugging instruments such as a color analyzer and the like in the prior art are fully solved, and the accurate debugging of the brightness can be realized by utilizing the current-brightness characteristic curve of the OLED device.

In this embodiment, the lowest gray scale of the display module is the 0 th gray scale, the highest gray scale of the display module is the jth gray scale, j is a positive integer, j is 255 in this embodiment, steps S120-S170 are performed for the 1 st gray scale to the jth gray scale, that is, steps S120-S170 are performed for the 1 st gray scale first, a register value corresponding to the 1 st gray scale is adjusted until the 1 st gray scale corresponds to a final register value, then a gray scale signal for debugging the 2 nd gray scale is sent, then the display module performs steps S120-S170 for the 2 nd gray scale, a register value corresponding to the 2 nd gray scale is adjusted until the 2 nd gray scale corresponds to the final register value, and then a signal for debugging the 3 rd gray scale is sent; …, respectively; and finally, the display module executes the steps S120-S170 on the jth gray scale, and adjusts the register value corresponding to the jth gray scale until the jth gray scale corresponds to the register value which finally meets the requirements. And then obtaining a gray scale-register value final corresponding table. In addition, in other embodiments of the present application, the steps S120-S150 may not be executed from the 1 st gray scale, but the steps S120-S150 may be executed from other gray scales, for example, the steps S120-S170 are executed from the 3 rd gray scale to the j th gray scale, or the steps S120-S170, … are executed from the 10 th gray scale to the j th gray scale. In this embodiment, the debugging method further includes: when the gray scale signal is the highest gray scale signal, the register value corresponding to the adjusted gray scale signal is burned into the Gamma module. That is, after the 1 st gray scale to the nth gray scale are debugged, the gray scale-register value final corresponding table is burned into the Gamma module, and then the display module can call the gray scale-register value final corresponding table in the Gamma module. In addition, in other embodiments of the present application, the debugging of each gray level can also only execute steps S150-S170.

In addition, in other embodiments of the present application, the lowest gray scale of the display module is the 0 th gray scale, the highest gray scale of the display module is the jth gray scale, and j is a positive integer, in this embodiment, j is 255, not all gray scales are performed in the steps S120-S170, but only a part of gray scales are performed in the steps S120-S170, in this part of gray scales, the starting gray scale may be the 1 st gray scale, or other gray scales such as the 2 nd gray scale, the 3 rd gray scale, and the 10 th gray scale. Specifically, i gray scales are selected from the 1 st gray scale to the j th gray scale, wherein i is a positive integer and is smaller than j, the selected i gray scales are all executed in the steps S120-S170, and then the i gray scales correspond to final register values, and the final register values corresponding to other gray scales are adjusted according to the obtained final register values corresponding to the i gray scales, specifically, calculated, so as to obtain the final register values of all gray scales, namely, a gray scale-register value final correspondence table. In this embodiment, the debugging method further includes: and burning the gray scale-register value final mapping table into a Gamma module. In addition, in other embodiments of the present application, the debugging of each gray level can also only execute steps S150-S170.

In this embodiment, the step of obtaining the actual current value currently flowing through the display panel specifically includes: acquiring current values flowing through all the X sub-pixels in a preset area of the display panel according to the gray scale signals; and calculating the average current value of the X sub-pixels according to the current values of the plurality of X sub-pixels. In this embodiment, the display panel of the display module includes a plurality of X sub-pixels, at least a portion of the plurality of X sub-pixels is distributed in a preset region defined in advance, the preset region may be a small-area region or the whole display panel, and the preset region may be a square, a circle or other shapes. The display module collects current values flowing through all the X sub-pixels in a preset area, the current values may be the same or different, then the average current value of the X sub-pixels is obtained through calculation according to the collected current values of the X sub-pixels, and the specific calculation mode is that the sum of all the collected current values is divided by the number of the current values, or the average current value is obtained through other calculation modes.

In addition, the present application also provides a Gamma debugging apparatus corresponding to the above method, please refer to fig. 3, where the Gamma debugging apparatus of the display module shown in the embodiment shown in fig. 3 is used to execute the method of the above embodiment of the present application, for convenience of description, only the part related to the embodiment of the present application is shown, and details of the specific technology are not disclosed, and please refer to the method of the above embodiment of the present application. The Gamma debugging apparatus of the present application includes a target current storage module 110, a gray scale switching module 120, a gray scale generating module 130, a detecting module 140, a comparing module 150, and a digital Gamma control module 160. In addition, in other embodiments of the present application, the Gamma debugging apparatus may further include only the detection module 140, the comparison module 150, and the digital Gamma control module 160, but does not include the target current storage module 110, the gray level switching module 120, and the gray level generation module 130.

Specifically, the target current storage module 110 is configured to store a gray scale-target current value correspondence table, and the digital gamma control module is further configured to store a gray scale-register value initial correspondence table, where each gray scale in the initial correspondence table is in a one-to-one correspondence with a register value, each gray scale in the gray scale-target current value correspondence table is in a one-to-one correspondence with a target current value, and a register value is in a one-to-one correspondence with a driving voltage.

The gray scale switching module 120, the gray scale switching module 120 is used for obtaining a gray scale signal for debugging; the gray scale switching module 120 is further configured to obtain a corresponding register value according to the gray scale signal, obtain a corresponding driving voltage according to the register value, and obtain a target current value corresponding to the gray scale signal from the gray scale-target current value correspondence table.

The gray scale generation module 130 is used for driving the display panel of the display module by the driving voltage.

And the detection module 140 is configured to obtain an actual current value currently flowing through the display module according to the gray-scale signal.

And a comparing module 150 for comparing the actual current value with a target current value corresponding to the gray scale signal.

A Digital Gamma Control (DGC) module 160 for adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value. The digital gamma control module is specifically used for maintaining the register value corresponding to the gray scale signal when the difference between the actual current value and the target current value is smaller than a preset range. The digital gamma control module is specifically configured to: if the result of subtracting the target current value from the actual current value is larger than the upper limit of the preset range, subtracting a from the register value originally corresponding to the gray scale signal to obtain a new corresponding register value, wherein a is an integer of 1-5; if the result of subtracting the target current value from the actual current value is less than the lower limit of the preset range, the original corresponding register value of the gray scale signal is increased by b to obtain a new corresponding register value, wherein b is an integer of 1-5.

In this embodiment, the Gamma debugging apparatus further includes a one-time programmable (OTP) module 170 for programming the register value corresponding to the adjusted gray scale signal into the Gamma module when the gray scale signal is the highest gray scale signal. In this embodiment, the Digital Gamma Control (DGC) module 160 is further configured to: and storing the register value corresponding to the adjusted gray scale signal.

In this embodiment, the display panel of the display module includes three sub-pixels, the three sub-pixels are respectively an R sub-pixel, a G sub-pixel and a B sub-pixel, the gray scale signal belongs to an X sub-pixel, wherein the X sub-pixel is one of the R sub-pixel, the G sub-pixel and the B sub-pixel; the actual current value is an average current value, the average current value is an average current value of the X sub-pixel, and the detection module is specifically configured to:

acquiring current values flowing through all the X sub-pixels in a preset area of the display panel according to the gray scale signals;

and calculating the average current value of the X sub-pixels according to the current values of the plurality of X sub-pixels.

In this embodiment, the gray-scale register value initial mapping table and the gray-scale target current value mapping table are 3 in number, and correspond to the R sub-pixel, the G sub-pixel, and the B sub-pixel, respectively.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims

A Gamma debugging method of a display module is characterized by comprising the following steps: obtaining the actual current value of the display panel flowing through the display module at present according to the gray scale signal;

comparing the actual current value with a target current value corresponding to the gray scale signal;

and adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value.
The Gamma adjustment method of claim 1, further comprising, after the step of adjusting the register value corresponding to the gray-scale signal according to the difference between the actual current value and the target current value: and storing the register value corresponding to the adjusted gray scale signal.
The Gamma adjustment method of claim 1, wherein the step of adjusting the register value corresponding to the gray-scale signal according to the difference between the actual current value and the target current value comprises: and when the difference between the actual current value and the target current value is smaller than the preset range, maintaining the register value corresponding to the gray scale signal.
The Gamma adjustment method of claim 3, wherein the step of maintaining the register value corresponding to the gray-scale signal when the difference between the actual current value and the target current value is smaller than the predetermined range further comprises the steps of: when the gray scale signal is the highest gray scale signal, the register value corresponding to the adjusted gray scale signal is burned into the Gamma module.
The Gamma adjustment method of claim 1, wherein the step of adjusting the register value corresponding to the gray-scale signal according to the difference between the actual current value and the target current value comprises:

if the result of subtracting the target current value from the actual current value is larger than the upper limit of the preset range, subtracting a from the register value originally corresponding to the gray scale signal to obtain a new corresponding register value, wherein a is an integer of 1-5;

if the result of subtracting the target current value from the actual current value is less than the lower limit of the preset range, the original corresponding register value of the gray scale signal is increased by b to obtain a new corresponding register value, wherein b is an integer of 1-5.
The Gamma adjustment method of claim 1, wherein the step of obtaining the current value of the actual current flowing through the display module according to the gray-scale signal further comprises the steps of:

and storing a gray scale-register value initial correspondence table and a gray scale-target current value correspondence table, wherein each gray scale in the initial correspondence table corresponds to a register value one by one, each gray scale in the gray scale-target current value correspondence table corresponds to a target current value one by one, and the register value corresponds to the driving voltage one by one.
The Gamma adjustment method of claim 6, wherein before the step of obtaining the actual current value currently flowing through the display module according to the gray scale signal and after the step of storing the gray scale-register value initial correspondence table and the gray scale-target current value correspondence table, further comprising the steps of:

obtaining a gray scale signal for debugging;

obtaining a corresponding register value according to the gray scale signal, obtaining a corresponding driving voltage according to the register value, and obtaining a target current value corresponding to the gray scale signal from a gray scale-target current value correspondence table;

and driving the display panel of the display module by the driving voltage.
The Gamma adjustment method of claim 7, wherein the display panel of the display module comprises three sub-pixels, the three sub-pixels are respectively an R sub-pixel, a G sub-pixel and a B sub-pixel, the gray scale signal belongs to an X sub-pixel, and the X sub-pixel is one of the R sub-pixel, the G sub-pixel and the B sub-pixel.
The Gamma adjustment method of claim 8, wherein the step of driving the display panel of the display module by the driving voltage specifically comprises:

the R, G, and B sub-pixels are driven by the driving voltage.
The Gamma adjustment method of claim 8, wherein the actual current value is an average current value, the average current value is an average current value of the X sub-pixels, and the step of obtaining the actual current value currently flowing through the display module according to the gray-scale signal specifically comprises:

acquiring current values flowing through all the X sub-pixels in a preset area of the display panel according to the gray scale signals;

and calculating the average current value of the X sub-pixels according to the current values of the plurality of X sub-pixels.
The Gamma adjustment method of claim 8, wherein the gray-level-register value initial mapping table and the gray-level-target current value mapping table are 3 in number, and correspond to the R sub-pixel, the G sub-pixel, and the B sub-pixel, respectively.
The Gamma debugging method of claim 8, wherein the Gamma debugging method is applied to an R sub-pixel, a G sub-pixel, and a B sub-pixel, and the debugging methods for the R sub-pixel, the G sub-pixel, and the B sub-pixel are performed simultaneously or separately.
The utility model provides a Gamma debugging device of display module assembly which characterized in that includes:

the detection module is used for obtaining the current value of the actual current flowing through the display module according to the gray scale signal;

the comparison module is used for comparing the actual current value with a target current value corresponding to the gray scale signal;

and the digital gamma control module is used for adjusting the register value corresponding to the gray scale signal according to the difference between the actual current value and the target current value.
The Gamma debugging apparatus of claim 13, wherein the digital Gamma control module is further configured to store register values corresponding to the adjusted gray-scale signals.
The Gamma adjustment apparatus of claim 13, wherein the digital Gamma control module is configured to maintain the register value corresponding to the gray-scale signal when the difference between the actual current value and the target current value is smaller than a predetermined range.
The Gamma debugging device of claim 15, further comprising a one-time programmable module for programming a register value corresponding to the adjusted gray-scale signal into the Gamma module when the gray-scale signal is the highest gray-scale signal.
The Gamma debugging apparatus of claim 13, wherein the digital Gamma control module is specifically configured to:

if the result of subtracting the target current value from the actual current value is larger than the upper limit of the preset range, subtracting a from the register value originally corresponding to the gray scale signal to obtain a new corresponding register value, wherein a is an integer of 1-5;

if the result of subtracting the target current value from the actual current value is less than the lower limit of the preset range, the original corresponding register value of the gray scale signal is increased by b to obtain a new corresponding register value, wherein b is an integer of 1-5.
The Gamma debugging device of claim 13, wherein the digital Gamma control module is further configured to store an initial gray scale-register value correspondence table, and the debugging device further comprises a target current storage module configured to store a gray scale-target current value correspondence table, wherein each gray scale in the initial correspondence table has a one-to-one correspondence with a register value, and wherein each gray scale in the gray scale-target current value correspondence table has a one-to-one correspondence with a target current value, and the register value has a one-to-one correspondence with a driving voltage.
The Gamma debugging device of claim 18, further comprising a gray scale switching module and a gray scale generating module, wherein the gray scale switching module is configured to obtain a gray scale signal for debugging; the gray scale switching module is also used for obtaining a corresponding register value according to the gray scale signal, obtaining a corresponding driving voltage according to the register value, and obtaining a target current value corresponding to the gray scale signal from a gray scale-target current value correspondence table; the gray scale generation module is used for driving a display panel of the display module through the driving voltage.
The Gamma adjustment apparatus of claim 13, wherein the display panel of the display module comprises three sub-pixels, the three sub-pixels are respectively an R sub-pixel, a G sub-pixel and a B sub-pixel, the gray scale signal belongs to an X sub-pixel, wherein the X sub-pixel is one of the R sub-pixel, the G sub-pixel and the B sub-pixel; the actual current value is an average current value, the average current value is an average current value of the X sub-pixel, and the detection module is specifically configured to:

acquiring current values flowing through all the X sub-pixels in a preset area of the display panel according to the gray scale signals;

and calculating the average current value of the X sub-pixels according to the current values of the plurality of X sub-pixels.
The Gamma adjustment apparatus of claim 13, wherein the gray-level register value initial mapping table and the gray-level target current value mapping table are 3 in number, and correspond to the R sub-pixel, the G sub-pixel, and the B sub-pixel, respectively.