CN110930954A - Display brightness compensation method and compensation system - Google Patents
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Abstract
The invention discloses a display brightness compensation method and a compensation system, which relate to the technical field of display, wherein the method comprises the following steps of current compensation, and the current compensation specifically comprises the following steps: receiving a first to-be-processed image which is sent by an image acquisition device and corresponds to a display device, wherein the first to-be-processed image comprises m first areas; acquiring brightness data of each first area, and respectively obtaining different normal distribution curves about the position and the brightness of the light-emitting source in the first area; respectively obtaining the peak brightness of each first area according to the normal distribution curve corresponding to each first area; acquiring the maximum value in the peak value brightness corresponding to all the first areas, and calculating the compensation current value of each first area according to the peak value brightness corresponding to each first area and the maximum value in the peak value brightness; and transmitting the compensation current value in each first area to the light-emitting driving module, and correspondingly transmitting the compensation current value to each first area by the light-emitting driving module. This is beneficial to improving the uniformity of the display brightness.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display brightness compensation method and a compensation system.
Background
Liquid Crystal Displays (LCDs) are passive light emitters whose light source needs to be provided by a backlight. Because the LED has the advantages of good color restoration, power saving, long service life, high reliability and the like, the color level of the liquid crystal display can be improved by using the LED backlight source, and the response speed of the backlight source can be greatly improved.
With the increasing pursuit of people for display image quality, at present, many displays are displayed by using a Local Dimming (i.e., Local backlight adjustment) backlight module, for example, each LED forming a backlight source can be adjusted according to the brightness of an image, the LED corresponding to a high-brightness portion in the displayed image can be adjusted to the maximum brightness, and the LED corresponding to a dark portion in the displayed image can be correspondingly reduced in brightness or even turned off to achieve the optimal contrast.
However, due to the process limitation of the LED, it is impossible to produce two identical LEDs, and the process of attaching the polarizer and the chip bonding process involved in the production process of the liquid crystal display have different errors, which may cause the display to have uneven display brightness. Therefore, how to improve the display brightness uniformity of the display device becomes one of the technical problems to be solved urgently at the present stage.
Disclosure of Invention
In view of this, the present invention provides a display brightness compensation method and a compensation system, which can compensate the display brightness to improve the display brightness uniformity of the display device.
In a first aspect, the present application provides a display brightness compensation method, including a current compensation step, where the current compensation specifically includes:
receiving a first to-be-processed image which is sent by an image acquisition device and corresponds to a display device, wherein the first to-be-processed image comprises m first areas, and the first areas comprise a plurality of first pixels; the display device comprises a light-emitting module, the light-emitting module comprises a light-emitting driving module and a plurality of light-emitting subareas, light-emitting light sources are arranged in the light-emitting subareas, and the light-emitting subareas correspond to the first areas one by one;
acquiring brightness data of each first region, and respectively fitting the brightness data of each first region to obtain different normal distribution curves about the position and the brightness of a light-emitting source in each first region;
respectively obtaining the peak brightness of each first region and the peak corresponding to the nth first region according to the normal distribution curve corresponding to each first regionValue brightness of Ln，1≤n≤m；
Acquiring the maximum value of the peak brightness corresponding to all the first areas, and calculating the compensation current value of each first area according to the peak brightness corresponding to each first area and the maximum value of the peak brightness;
and transmitting the compensation current value in each first area to the light-emitting driving module, wherein the light-emitting driving module correspondingly transmits the compensation current value to each first area.
In a second aspect, the present application further provides a display brightness compensation system, comprising: image acquisition device, display device and terminal equipment, wherein:
the image acquisition device is used for acquiring a first to-be-processed image of the display device, wherein the first to-be-processed image comprises m first areas, and each first area comprises a plurality of first pixels; the display device comprises a light-emitting module, the light-emitting module comprises a light-emitting driving module and a plurality of light-emitting subareas, a plurality of light-emitting light sources are arranged in each light-emitting subarea, and the light-emitting subareas correspond to the first areas one by one;
the terminal device is used for acquiring brightness data of each first region, fitting the brightness data of each first region, and obtaining different normal distribution curves about the position and the brightness of the light-emitting source in the first region; and obtaining the peak brightness of each first region according to the normal distribution curve corresponding to each first region, wherein the peak brightness corresponding to the nth first region is LnN is more than or equal to 1 and less than or equal to m; the compensation current value calculation module is further used for obtaining the maximum value of the peak brightness corresponding to all the first areas and calculating the compensation current value of each first area according to the peak brightness corresponding to each first area and the maximum value of the peak brightness; and the compensation current value in each first area is further transmitted to a light-emitting driving module in the display device.
Compared with the prior art, the display brightness compensation method and the compensation system provided by the invention at least realize the following beneficial effects:
in the display brightness compensation method and the compensation system provided by the invention, after a first image to be processed which is sent by an image acquisition device and corresponds to a display device is received, different normal distribution curves are obtained by fitting through acquiring brightness data of each first area corresponding to the first image to be processed; the peak brightness corresponding to each first region can be obtained according to each normal distribution curve; then, the compensation current value of each first area is obtained according to the maximum value of each peak value brightness and each peak value brightness, so that the compensation current value is transmitted to the light-emitting driving module, and the compensation current value is correspondingly transmitted to each first area, that is, the brightness corresponding to each first area is compensated in a current compensation mode, so that the brightness of each first area is the same, the display brightness of the display device is more uniform, the uniformity of the display brightness of the display device is effectively improved, and the visual experience effect of a user is favorably improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flowchart illustrating a method for compensating display brightness according to an embodiment of the present disclosure;
fig. 2 is a top view of a first to-be-processed image provided by an embodiment of the present application;
fig. 3 is a top view of a light emitting module according to an embodiment of the present disclosure;
FIG. 4 is a graph illustrating the position and brightness of a light-emitting source in a first region according to the present application;
FIG. 5 is a flowchart illustrating a pixel compensation method according to an embodiment of the present disclosure;
FIG. 6 is a diagram illustrating a correspondence relationship between sub-pixels in a second image to be processed and display pixels in a display device according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of a display luminance compensation system according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a display device in a display brightness compensation system according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a flowchart illustrating a display luminance compensation method according to an embodiment of the present application, and please refer to fig. 1, the display luminance compensation method includes a current compensation step, wherein the current compensation specifically includes:
102, acquiring brightness data of each first area 31, and respectively fitting the brightness data of each first area 31 to obtain different normal distribution curves about the position and the brightness of the light-emitting source 42 in the first area 31;
Specifically, referring to fig. 1 to fig. 3, when the display brightness of a display device needs to be compensated, an image displayed by the display device needs to be acquired by an image acquisition device to obtain a first to-be-processed image 30, it should be noted that fig. 2 only illustrates the first to-be-processed image 30, and actually, the first to-be-processed image 30 may be any image that can be displayed by the display device. Referring to fig. 3, the light emitting module 40 includes a plurality of light emitting partitions 41, each of the light emitting partitions 41 is provided with a plurality of light emitting sources 42, the light emitting driving module 43 can individually control the brightness corresponding to each of the light emitting partitions 41, the light emitting partitions 41 correspond to the first areas 31 in the first to-be-processed image 30 one by one, and the brightness of the light emitting partitions 41 is adjusted to adjust the display brightness of the first areas 31. It should be noted that the number, shape, and size of the light-emitting sections 41 and the first regions 31 shown in fig. 2 and 3 are only schematic illustrations and do not represent actual numbers, shapes, and sizes, and the number and size of the light-emitting sources 42 included in the light-emitting sections 41 are also only schematic illustrations and do not represent actual numbers and sizes.
After receiving the first to-be-processed image 30, obtaining the luminance data of each first region 31 through the step 102, and fitting the luminance data corresponding to each first region 31 to a corresponding normal distribution curve f (x), where the normal distribution curve f (x) is a curve related to the position and luminance of the light-emitting source 42 in the first region 31, for example, please refer to fig. 4, where fig. 4 is a curve related to the position and luminance of the light-emitting source 42 in the first region 31 in the present application; the formula for the normal distribution curve f (x) is, for example:
in general, when the light-emitting source 42 is formed by Mini LEDs, one Mini LED may correspond to a plurality of sub-pixels in the display device, and the Mini LED may be disposed at the center of the area where the plurality of sub-pixels are located. In the above normal distribution, f (x) represents the brightness of each sub-pixel in each first area 31, and x represents the distance from the different sub-pixels in the first area 31 to the Mini LED.
In the step 103, the peak luminance of each first region 31 is obtained according to the normal distribution curve f (x) corresponding to each first region 31, and the luminance corresponding to the vertex in each normal distribution curve f (x) is the peak luminance of the corresponding first region 31. In step 104, the peak luminance of each first region 31 is compared to obtain the maximum value of each peak luminance, and then the compensation current value of each first region 31 is calculated based on the maximum value and the peak luminance corresponding to each first region 31. Finally, in the step 105, the calculated compensation current value corresponding to each first region 31 is transmitted to the light-emitting driving module 43, and then the light-emitting driving module 43 transmits each compensation current value to the corresponding light-emitting partition 41, and further transmits the compensation current value to the first region 31 corresponding to the light-emitting partition 41. So, this application has compensated the luminance that each first region 31 corresponds through the mode of current compensation for the luminance of each first region 31 is the same, thereby makes display device's demonstration luminance more even, has effectively promoted display device's demonstration luminance homogeneity, is favorable to promoting user's visual experience effect.
Optionally, in step 104, the compensation current value of each first region 31 is calculated according to the peak luminance and the maximum value of the peak luminance corresponding to each first region 31, and is:
using formula Izn＝Lmax*In/LnCalculating a compensation current value for each first region 31, wherein IznA compensation current value, L, representing the nth first region 31maxRepresents the maximum value, I, of the peak luminance corresponding to all the first regions 31nRepresents the initial current value, L, supplied by the light-emitting module 40 to the nth first region 31nRepresenting the peak luminance corresponding to the nth first region 31.
Specifically, the present application utilizes formula Izn＝Lmax*In/LnCalculating the compensation current value of each first region 31 corresponds to the maximum value L of the peak luminancemaxAnd the peak luminance L of the nth first region 31nRatio L ofmax/LnAs the brightness compensation coefficient of the nth first region 31, the brightness compensation coefficient and the initial current value I of the nth first region 31nThe product of these two is the compensation current value of the nth first region 31. The mode of calculating the compensation current value by adopting the formula is simple, the calculation result is accurate, and the current provided to each first area 31 by the light-emitting driving module 43 can be accurately compensated, so that the display uniformity of the display device can be improved.
Optionally, in this application, the first to-be-processed image obtaining method includes: the display device and the image acquisition device are both arranged in a darkroom, and the image acquisition device is used for acquiring a white picture image of the display device under a first gray scale to serve as a first image to be processed.
Specifically, according to the image processing method and the image processing device, the image acquisition device and the display device are arranged in the darkroom, and the first image to be processed of the display device is acquired through the image acquisition device, so that the influence of external light on the brightness of the first image to be processed of the display device is avoided, and the brightness of the first image to be processed shot by the image acquisition device can represent the actual brightness of the first image to be processed in the display device. Moreover, the present application photographs a white frame image of the display device at a first gray level, optionally, the first gray level is a high gray level, for example, the first gray level may be a highest gray level 255 gray level, the present application only takes the highest gray level 255 gray level as an example for description, in some other embodiments of the present application, a specific numerical value of the first gray level may also be selected according to different requirements, and is not limited specifically herein. In the prior art, when a white frame of a display device has a dark area under a 255 gray scale, which results in uneven brightness of the display frame, since the 255 gray scale is equivalent to having adjusted the pixel voltage to the maximum, it has not been possible to further improve the brightness of the dark area appearing in the white frame by increasing the pixel voltage. Aiming at the phenomenon, the brightness of the dark state area of the white picture under the 255 gray scale is adjusted by adopting a compensation current mode, on the premise of not changing the driving voltage, the driving current of the luminous subarea corresponding to the dark state area is increased, so that the brightness of the dark state area of the white picture under the 255 gray scale is further increased, the brightness difference between the dark state area and the normal area is reduced, the brightness uniformity of the display device is effectively improved, and the visual experience effect of a user is improved.
In some optional embodiments of the present application, the display device is a liquid crystal display device, where the light emitting module 40 is correspondingly embodied as a Local Dimming backlight module, the light emitting driving module 43 is correspondingly embodied as a backlight driving module, the light emitting partitions 41 are correspondingly embodied as backlight partitions, the light emitting source 42 may be embodied as a Mini LED, for example, and the backlight driving module can control the brightness of the Mini LED in each backlight partition to realize a Local Dimming function. After the liquid crystal display device is compensated by adopting the current compensation process, if the displayed image still has the phenomenon of uneven brightness, the pixels of the display device can be further compensated by the pixel compensation step mentioned later in the application, namely, the phenomenon of uneven brightness of the display device is improved by adopting a mode of combining the current compensation and the pixel compensation.
In some optional embodiments of the present application, the display device is a Micro LED display device, the light-emitting source 42 is correspondingly embodied as a Micro LED, and the Micro LED can emit light automatically, so that a backlight source is not required to be introduced. When the micro led is used as the display pixel of the display device, the brightness compensation method only includes the current compensation step, that is, the brightness unevenness of the display device can be improved only by the current compensation.
Optionally, in some optional embodiments of the present application, after the step of current compensation, a step of pixel compensation is further included, please refer to fig. 5, where fig. 5 is a flowchart of a pixel compensation method provided in an embodiment of the present application, where the pixel compensation specifically includes:
and 204, transmitting the calculated target compensation values to a display driving module in the display device, and correspondingly transmitting each target compensation value to a display pixel corresponding to each second pixel in the display device by the display driving module so that the brightness data of the display pixels in the display device are the same.
Specifically, the pixel compensation method is performed based on a display device subjected to current compensation, the display device corresponds to a liquid crystal display device, the light-emitting module corresponds to a backlight module, and the backlight module comprises a plurality of Mini LEDs so as to realize a Local Dimming function. When the current compensation is performed, if the display device still has the phenomenon of uneven brightness, the pixel compensation method can be introduced to further compensate the area with uneven brightness in the display device. After the second to-be-processed image corresponding to the display device after current compensation is obtained in step 201, the luminance data of each second pixel is obtained in steps 202 and 203, and the target compensation value of each second pixel is obtained through calculation, where the target compensation value refers to the luminance data that is finally provided by the display driving module to the corresponding display pixel in the display device after pixel compensation, and then the calculated target compensation value is transmitted to the display driving module in the display device through step 204 and is transmitted to each display pixel in the display device by the display driving module, so that the technical effect that the luminance data of each display pixel in the display device are the same is achieved. After the brightness of each first area in the display device is compensated through the current compensation step, when the display device still has the uneven brightness, the method further includes the steps 201 to 204, namely, the brightness of the display pixels corresponding to the second pixels in the display device is compensated again through the pixel compensation mode, so that the uneven brightness areas in the display device are compensated through the combination of the current compensation and the pixel compensation, the brightness data of the display pixels in the display device are the same, the display uniformity of the display device is greatly improved, and the visual experience effect of a user is further improved.
Optionally, in the above steps 201 to 204, the method for acquiring the second image to be processed includes: and both the image acquisition device and the display device are placed in a darkroom, and the image acquisition device is used for acquiring a white picture image of the display device subjected to current compensation under the first gray scale to serve as a second image to be processed.
Specifically, according to the image processing method and the image processing device, the image acquisition device and the display device are arranged in the darkroom, and the second to-be-processed image of the display device is acquired through the image acquisition device, so that the influence of external light on the brightness of the second to-be-processed image of the display device is avoided, and the brightness of the second to-be-processed image shot by the image acquisition device can represent the actual brightness of the second to-be-processed image in the display device. Moreover, the present application photographs a white frame image of the display device at a first gray level, optionally, the first gray level is a high gray level, for example, the first gray level may be a highest gray level 255 gray level, the present application only takes the highest gray level 255 gray level as an example for description, in some other embodiments of the present application, a specific numerical value of the first gray level may also be selected according to different requirements, and is not limited specifically herein. In the prior art, when a white frame of a display device has a dark area under a 255 gray scale, which results in uneven brightness of the display frame, since the 255 gray scale is equivalent to having adjusted the pixel voltage to the maximum, it has not been possible to further improve the brightness of the dark area appearing in the white frame by increasing the pixel voltage. Aiming at the phenomenon, the brightness of a dark state area of a white picture under the 255 gray scale is adjusted by adopting a pixel compensation mode, the pixel compensation is carried out on the dark state area through the improvement on the premise of not changing the driving voltage, so that the brightness of the dark state area of the white picture under the 255 gray scale is further improved, the brightness difference between the dark state area and a normal area is reduced, the brightness uniformity of the display device is effectively improved, and the visual experience effect of a user is favorably improved.
Optionally, before the obtaining the luminance data of each second pixel in step 202, the method further includes: and matching the position of a second pixel in the second image to be processed with the position of a display pixel of the display device, and extracting the position corresponding to the display pixel in the display device from the second image to be processed.
Specifically, fig. 6 is a diagram illustrating a corresponding relationship between a sub-pixel 61 in a second image to be processed and a display pixel 50 in a display device according to an embodiment of the present application, where the second image to be processed includes a plurality of second pixels 60, that is, a portion shown by a dotted frame in the diagram, and the second pixel 60 includes a plurality of sub-pixels 61; in addition, the structure filled with the black dots in the box represents the display pixels 50 in the display device. Since the PPI (pixels Per inc) of the image capturing device is higher than that of the display device, the number of sub-pixels included in the second to-be-processed image captured by the image capturing device Per unit area is greater than that of the display device, and therefore, the plurality of sub-pixels 61 in the second to-be-processed image corresponds to one display pixel 50 in the display device. Before acquiring the brightness data of each second pixel, the display pixel 50 of the display device needs to correspond to the positions of the sub-pixels 61 of the second image to be processed captured by the image capturing device, which is beneficial to accurately acquiring the brightness data of each second pixel 60.
In step 202, the luminance data of each second pixel is obtained, where the luminance data of each second pixel corresponds to the luminance data of each second pixel captured by the image processing apparatus.
Optionally, in step 203, calculating a target compensation value of each second pixel according to the luminance data of each second pixel, specifically: and acquiring central brightness data of the display device, and calculating a target compensation value according to the brightness data of each second pixel and the central brightness data.
Specifically, when the target compensation value of each second pixel is calculated, the central brightness data of the display device is taken as a reference, and the central brightness data of the display device is usually the brightness reference data of the display device. Similarly, when the target compensation value of each second pixel is calculated, the target compensation value is calculated according to the brightness data of the second pixel and the central brightness data, so that the brightness of each second pixel can be compensated to the target compensation value, the brightness data of each second pixel are the same, the display brightness of each area of the display device is more uniform, and the phenomenon of uneven brightness and darkness is effectively improved.
Optionally, the calculating a target compensation value according to the brightness data of each second pixel and the central brightness data specifically includes:
according to the formula
A target compensation value gray' is calculated, wherein,
gray is the gray scale shot by the image acquisition device, and lv is the brightness data of the second pixelaimThe center brightness data is 2.2 the gamma value of the display device.
Specifically, the embodiment provides a specific method for calculating the target compensation value according to the central brightness data and the brightness data of the second pixel, the formula comprehensively considers the gray scale shot by the image acquisition device, the brightness data of the second pixel, the central brightness data of the display device and the gamma value, the accuracy of the calculated target compensation value is high, and when each second pixel in the display device is compensated through the target compensation value, the final brightness of each second pixel tends to be consistent, so that the display uniformity of the display device is further improved.
Based on the same inventive concept, the present application further provides a display brightness compensation system, and fig. 7 is a schematic structural diagram of the display brightness compensation system provided in the embodiment of the present application, where the compensation system 500 includes: fig. 8 is a schematic structural diagram of the display device 100 in the display brightness compensation system 500 according to an embodiment of the present application, shown in fig. 8, where:
an image acquisition device 200, configured to acquire a first to-be-processed image of the display device 100, referring to fig. 2, where the first to-be-processed image 30 includes m first regions 31, and each first region 31 includes a plurality of first pixels 71; the display device 100 includes a light emitting module 40, please refer to fig. 3, in which the light emitting module 40 includes a light emitting driving module 43 and a plurality of light emitting partitions 41, each of the light emitting partitions 41 has a plurality of light emitting sources 42, and the light emitting partitions 41 correspond to the first regions 31 one by one;
the terminal device 300 is configured to obtain luminance data of each first region 31, and fit the luminance data of each first region 31 to obtain different normal distribution curves about the position and luminance of the light-emitting source 42 in the first region 31; and is used according to each first area 31The corresponding normal distribution curve obtains the peak brightness of each first region 31, and the peak brightness corresponding to the nth first region is LnN is more than or equal to 1 and less than or equal to m; the compensation current value calculation module is further configured to obtain a maximum value of the peak luminance corresponding to all the first regions 31, and calculate the compensation current value of each first region 31 according to the peak luminance corresponding to each first region 31 and the maximum value of the peak luminance; and further for transmitting the compensation current value in each first region 31 to the light emission driving module in the display device 100.
The display device 100 in the present application is a liquid crystal display device or a Micro LED display device, and when the display device is a liquid crystal display device, the light emitting module is correspondingly embodied as a backlight module in the liquid crystal display device, and when the display device is a Micro LED display device, a light emitting source in the light emitting module is embodied as a Micro LED, and since the size of the Micro LED is very small, the light emitting module can be directly used as a display pixel of the display device.
In practical applications, the display device in the present application may be any product or component with practical functions, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. The display brightness compensation provided by the present application can improve the phenomenon of uneven brightness in the display device 100.
Referring to fig. 7, when the display brightness of the display device 100 needs to be compensated, the image displayed by the display device 100 needs to be captured by the image capturing device 200 to obtain the first image to be processed 30 shown in fig. 2. Then, the terminal device 300 is configured to obtain the luminance data of each first region 31, and fit the luminance data corresponding to each first region 31 to a corresponding normal distribution curve, where the normal distribution curve is a curve about the position and luminance of the light-emitting source in the first region, and the formula of the normal distribution curve is, for example:
in general, when the light emitting source is formed by Mini LEDs, one Mini LED may correspond to a plurality of sub-pixels in the display device 100, and the Mini LED may be disposed at the center of the area where the plurality of sub-pixels are located. The above is rightIn the state distribution curve, f (x) represents the brightness of each sub-pixel in each first area, and x represents the distance from different sub-pixels in each first area to the Mini LED. The terminal device 300 further obtains the peak brightness of each first region according to the normal distribution curve corresponding to each first region, obtains the maximum value of the peak brightness corresponding to all the first regions, and calculates the compensation current value of each first region according to the peak brightness corresponding to each first region and the maximum value of the peak brightness; and then transmits the compensation current value in each first region to the light emitting driving module in the display device 100. Finally, the light emitting driving module in the display device 100 transmits the compensation current values to the corresponding light emitting partitions respectively, and further transmits the compensation current values to the first regions corresponding to the light emitting partitions. Therefore, the display brightness compensation system 500 compensates the brightness corresponding to each first region in the current compensation manner, so that the brightness of each first region is the same, the display brightness of the display device 100 is more uniform, the display brightness uniformity of the display device 100 is effectively improved, and the visual experience effect of a user is favorably improved.
In an alternative embodiment, the image capturing apparatus 200 is further configured to obtain a second to-be-processed image of the display apparatus 100 after the current compensation, referring to fig. 6, where the second to-be-processed image includes a plurality of second pixels 60, and each of the second pixels 60 corresponds to one of the display pixels 50 in the display apparatus 100;
the terminal device 300 is further configured to obtain luminance data of each second pixel 60, and calculate a target compensation value of each second pixel 60 according to the luminance data of each second pixel 60; and is used to transmit the calculated target compensation value to the display driving module in the display device 100.
After the current compensation, if the display device 100 still has the uneven brightness, the display device 100 after the current compensation can be photographed by using the highlight acquisition device to obtain a second image to be processed. Since the image to be processed includes a plurality of second pixels 60, since the PPI of the image capturing device 200 is higher than that of the display device 100, the second pixels 60 in the second image to be processed mentioned in this application generally include a plurality of sub-pixels 61, and the plurality of sub-pixels 61 corresponds to one display pixel 50 in the display device 100. After the terminal device 300 acquires the luminance data of each second pixel 60, the target compensation value of each second pixel 60 is calculated, and the calculated target compensation value is transmitted to the display driving module in the display device 100 and transmitted to each display pixel 50 in the display device 100 by the display driving module, so that the technical effect that the luminance data of each display pixel 50 in the display device 100 are the same is achieved. After the brightness of each first area in the display device 100 is compensated through the current compensation step, when the display device 100 still has the phenomenon of uneven brightness, the brightness of the display pixels 50 corresponding to each second pixel 60 in the display device 100 is compensated again through the pixel compensation mode, so that the areas with uneven brightness in the display device 100 are compensated through the combination mode of the current compensation and the pixel compensation, so that the brightness data of each display pixel 50 in the display device 100 are the same, thereby greatly improving the display uniformity of the display device 100, and being beneficial to further improving the visual experience effect of a user.
In an alternative embodiment, with continuing reference to fig. 6 and 7, the terminal device 300 is further configured to obtain the central luminance data of the display apparatus 100, and calculate the target compensation value according to the luminance data of each second pixel 60 and the central luminance data.
Specifically, the terminal device 300 calculates the target compensation value of each second pixel 60, using the central luminance data of the display apparatus 100 as a reference, and the central luminance data of the display apparatus 100 is typically the luminance reference data of the display apparatus 100, so that when the luminance of each area of the display apparatus 100 is referenced to the central luminance, the luminance uniformity of the display apparatus 100 can be improved. Similarly, when the terminal device 300 calculates the target compensation value of each second pixel 60, the target compensation value is calculated according to the luminance data of the second pixel 60 and the central luminance data, so that the luminance of each second pixel 60 can be compensated to the target compensation value, the luminance data of each second pixel 60 is the same, the display luminance of each area of the display device 100 is more uniform, and the phenomenon of uneven luminance and dark is effectively improved.
In summary, the display brightness compensation method and the compensation system provided by the invention at least achieve the following beneficial effects:
in the display brightness compensation method and the compensation system provided by the invention, after a first image to be processed which is sent by an image acquisition device and corresponds to a display device is received, different normal distribution curves are obtained by fitting through acquiring brightness data of each first area corresponding to the first image to be processed; the peak brightness corresponding to each first region can be obtained according to each normal distribution curve; then, the compensation current value of each first area is obtained according to the maximum value of each peak value brightness and each peak value brightness, so that the compensation current value is transmitted to the light-emitting driving module, and the compensation current value is correspondingly transmitted to each first area, that is, the brightness corresponding to each first area is compensated in a current compensation mode, so that the brightness of each first area is the same, the display brightness of the display device is more uniform, the uniformity of the display brightness of the display device is effectively improved, and the visual experience effect of a user is favorably improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A display brightness compensation method is characterized by comprising a current compensation step, wherein the current compensation step specifically comprises the following steps:
receiving a first to-be-processed image which is sent by an image acquisition device and corresponds to a display device, wherein the first to-be-processed image comprises m first areas, and the first areas comprise a plurality of first pixels; the display device comprises a light-emitting module, the light-emitting module comprises a light-emitting driving module and a plurality of light-emitting subareas, light-emitting light sources are arranged in the light-emitting subareas, and the light-emitting subareas correspond to the first areas one by one;
acquiring brightness data of each first region, and respectively fitting the brightness data of each first region to obtain different normal distribution curves about the position and the brightness of a light-emitting source in each first region;
respectively obtaining the peak brightness of each first area according to the normal distribution curve corresponding to each first area, wherein the peak brightness corresponding to the nth first area is Ln，1≤n≤m；
Acquiring the maximum value of the peak brightness corresponding to all the first areas, and calculating the compensation current value of each first area according to the peak brightness corresponding to each first area and the maximum value of the peak brightness;
and transmitting the compensation current value in each first area to the light-emitting driving module, wherein the light-emitting driving module correspondingly transmits the compensation current value to each first area.
2. The display luminance compensation method according to claim 1, wherein the calculating of each first region compensation current value from a peak luminance corresponding to each first region and a maximum value of the peak luminance is:
using formula Izn＝Lmax*In/LnCalculating a compensation current value for each of the first regions, wherein IznA compensation current value, L, representing the nth of said first regionmaxRepresents the maximum value of the peak brightness corresponding to all the first regions, InRepresenting the initial current value provided by the light-emitting module to the nth first area.
3. The display luminance compensation method according to claim 1, wherein the first to-be-processed image is acquired by: and placing the display device and the image acquisition device in a darkroom, and acquiring a white picture image of the display device under a first gray scale by using the image acquisition device to serve as the first image to be processed.
4. The display luminance compensation method according to claim 1, further comprising a step of pixel compensation after the step of current compensation, wherein the pixel compensation specifically comprises:
receiving a second image to be processed corresponding to the display device after the current compensation, which is sent by an image acquisition device, wherein the second image to be processed comprises a plurality of second pixels, and the second pixels are respectively in one-to-one correspondence with the display pixels in the display device;
acquiring brightness data of each second pixel;
calculating a target compensation value of each second pixel according to the brightness data of each second pixel;
and transmitting the calculated target compensation values to a display driving module in a display device, wherein the display driving module correspondingly transmits each target compensation value to a display pixel corresponding to each second pixel in the display device, so that the brightness data of the display pixels in the display device are the same.
5. The display brightness compensation method according to claim 4, wherein the second image to be processed is obtained by: and placing the image acquisition device and the display device in a darkroom, and acquiring a white picture image of the display device subjected to current compensation under a first gray scale by using the image acquisition device to serve as the second image to be processed.
6. The display luminance compensation method according to claim 4, further comprising, before the acquiring the luminance data of each of the second pixels:
and matching the position of the second pixel in the second image to be processed with the position of a display pixel of the display device, and extracting the position corresponding to the display pixel in the display device from the second image to be processed.
7. The method according to claim 4, wherein the calculating the target compensation value of each of the second pixels according to the luminance data of each of the second pixels comprises:
and acquiring central brightness data of the display device, and calculating a target compensation value according to the brightness data of each second pixel and the central brightness data.
8. The method for compensating display luminance according to claim 7, wherein calculating a target compensation value according to the luminance data of each of the second pixels and the central luminance data comprises:
according to the formula
A target compensation value gray' is calculated, wherein,
gray is the gray scale shot by the image acquisition device, and lv is the brightness data of the second pixelaimThe center brightness data is 2.2 the gamma value of the display device.
9. A display brightness compensation system, comprising: image acquisition device, display device and terminal equipment, wherein:
the image acquisition device is used for acquiring a first to-be-processed image of the display device, wherein the first to-be-processed image comprises m first areas, and each first area comprises a plurality of first pixels; the display device comprises a light-emitting module, the light-emitting module comprises a light-emitting driving module and a plurality of light-emitting subareas, a plurality of light-emitting light sources are arranged in each light-emitting subarea, and the light-emitting subareas correspond to the first areas one by one;
the terminal device is configured to obtain luminance data of each first region, and fit the luminance data of each first region to obtain a position of a light-emitting source in the first regionAnd a different normal distribution curve of luminance; and obtaining the peak brightness of each first region according to the normal distribution curve corresponding to each first region, wherein the peak brightness corresponding to the nth first region is LnN is more than or equal to 1 and less than or equal to m; the compensation current value calculation module is further used for obtaining the maximum value of the peak brightness corresponding to all the first areas and calculating the compensation current value of each first area according to the peak brightness corresponding to each first area and the maximum value of the peak brightness; and the compensation current value in each first area is further transmitted to a light-emitting driving module in the display device.
10. The display brightness compensation system of claim 9, wherein the image capturing device is further configured to obtain a second to-be-processed image of the display device after the current compensation, the second to-be-processed image includes a plurality of second pixels, and each of the second pixels corresponds to a display pixel in the display device in a one-to-one manner;
the terminal device is further configured to obtain luminance data of each second pixel, and calculate a target compensation value of each second pixel according to the luminance data of each second pixel; and transmitting the calculated target compensation value to a display driving module in the display device.
11. The display luminance compensation system according to claim 10, wherein the terminal device is further configured to obtain central luminance data of the display apparatus, and calculate the target compensation value according to the luminance data of each of the second pixels and the central luminance data.
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