CN114566118B

CN114566118B - Display color cast correction method, device and system

Info

Publication number: CN114566118B
Application number: CN202011271621.5A
Authority: CN
Inventors: 从洪春; 杨城
Original assignee: Xian Novastar Electronic Technology Co Ltd
Current assignee: Xian Novastar Electronic Technology Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2023-04-11
Anticipated expiration: 2040-11-13
Also published as: CN114566118A

Abstract

The invention relates to a method, a device and a system for correcting display color cast. The method comprises the following steps: generating at least one reference measurement data set and a plurality of measurement data sets to be corrected, wherein each reference measurement data set at least comprises one reference current amplitude value, and each measurement data set to be corrected at least comprises one current amplitude value to be corrected; controlling a display device to display at least one reference image group based on the at least one reference measurement data group; controlling acquisition equipment to acquire image data of the reference image group to obtain at least one reference brightness and chrominance data group; controlling a display device to display a plurality of image groups to be corrected based on the plurality of measured data groups to be corrected; controlling acquisition equipment to acquire image data of the plurality of image groups to be corrected to obtain a plurality of brightness and chrominance data groups to be corrected; and generating a plurality of complementary color coefficient sets based on the at least one reference brightness and chrominance data set and the plurality of brightness and chrominance data sets to be corrected. The invention can carry out effective color cast compensation on the display device.

Description

Display color cast correction method, device and system

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display color shift correction method, a display color shift correction device, and a display color shift correction system.

Background

With the development of LED (Light Emitting Diode) display technology, LED display screens are currently applied to various fields due to their advantages of low cost, low power consumption, high visibility, freedom in assembly, etc. Meanwhile, with the popularization of the application of the LED display screen, people have higher and higher requirements on the display quality of the LED display screen, and therefore how to improve the display quality of the LED display screen becomes a research hotspot in the field.

With the further popularization of LED display, the requirements of Mini LEDs and Micro LEDs are increasing, the sizes of LED chips are decreasing, the driving currents are also decreasing, and the driving modes of LEDs are changing accordingly. The original Passive (PM) driving method is changed to an Active (AM) driving method. The Modulation scheme of the LED is also changed from the original Pulse Width Modulation (PWM) to the Amplitude Modulation (PAM) or even to the hybrid Modulation (coexistence of PWM and PAM).

The current LED chip technology is difficult to meet the requirements of micro LED size, and the required driving current is still large. Influenced by the characteristics of the LED, the LED is in a stable state only when the current is large enough, and the light emitting characteristics of the LED change when the current amplitude changes, where the change of the light emitting characteristics mainly includes: the spectral characteristics of the LED, the main light-emitting wavelength and the light-emitting efficiency are changed. Amplitude Modulation (PAM) and mixed modulation mainly control the brightness of an LED by adjusting the current amplitude of the LED, namely, the amplitude modulation and the mixed modulation are based on a current amplitude modulation mode.

However, the primary problem faced by the amplitude modulation and hybrid modulation based on the current amplitude modulation method is to solve the color shift problem caused by the variation of the LED main emission wavelength due to the amplitude variation. For example, when the driving current of the blue LED is 35mA, the dominant wavelength is 460nm, and when the driving current is reduced to 15mA, the dominant wavelength is 470nm; the two blues at this time are completely different blues. The same problem can occur with green and red LEDs. Especially, the difference is obvious when displaying the white of different gray scales; for example, in the case of high brightness, the driving current is 35mA, and the white color is cold; at graying, the drive current is a few mA, at which time the white color tends to be warmer. Therefore, how to adjust the color temperature displayed by the LED is a technical problem to be solved urgently at present.

The existing color temperature adjustment adopts a fixed form of color temperature adjustment, for example, the color temperature adjustment is realized by multiplying red (R) component, green (G) component and blue (B) component by different coefficients respectively, specifically: if the color temperature of the LED display is to be adjusted to be low, the G component and the B component may be multiplied by a coefficient less than 1, so that the proportion of the R component becomes high, and the color temperature of the entire LED display will be decreased. However, the existing color temperature adjusting technology has obvious defects that the color temperature can only be adjusted manually, and color cast compensation under different current drives is not considered; for PAM modulation or hybrid modulation, it is not practical to adjust the color temperature manually, because the adjustable current change is shifted by too many steps, for example, 256 steps can be adjusted for 8-bit current adjustment.

Disclosure of Invention

Accordingly, to overcome at least some of the disadvantages and shortcomings in the prior art, embodiments of the present invention provide a method, an apparatus and a system for correcting color shift.

In one aspect, a method for correcting color cast in a display provided in an embodiment of the present invention includes: generating at least one reference metrology data set and a plurality of metrology data sets to be corrected, wherein each reference metrology data set comprises at least one reference current amplitude and each metrology data set to be corrected comprises at least one current amplitude to be corrected; controlling a target display device to display at least one reference image group based on the at least one reference metrology data group; controlling the target acquisition equipment to acquire image data of the at least one reference image group to obtain at least one reference brightness and chrominance data group; controlling the target display device to display a plurality of groups of images to be corrected based on the plurality of measured data groups to be corrected; controlling the target acquisition equipment to acquire image data of the plurality of image groups to be corrected so as to obtain a plurality of brightness and chrominance data groups to be corrected; and generating a plurality of complementary color coefficient sets based on the at least one reference brightness and chrominance data set and the plurality of brightness and chrominance data sets to be corrected, wherein the plurality of complementary color coefficient sets respectively correspond to the current amplitude values to be corrected contained in the plurality of measurement data sets to be corrected respectively.

In the display color cast correction method of this embodiment, a reference measurement data set and a measurement data set to be corrected are generated, a display reference image set and a image set to be corrected are controlled based on the generated reference measurement data set and the generated measurement data set to be corrected, an acquisition device is controlled to acquire image data of the display reference image set and the image set to be corrected to obtain a reference brightness and chrominance data set and a brightness and chrominance data set to be corrected, and then a complementary color coefficient set is generated based on the acquired reference brightness and chrominance data set and the brightness and chrominance data set to be corrected, so that complementary color coefficient sets corresponding to different current amplitudes can be obtained. And the generated complementary color coefficient set is subsequently applied to the target display device or other display devices in the same batch, so that the color cast compensation of the display device can be effectively realized.

In one embodiment of the present invention, the display color cast correction method further includes: acquiring a pulse width modulation value set, a reference current amplitude value and a current amplitude value set to be corrected; wherein the generating of the at least one reference metrology data set and the plurality of metrology data sets to be corrected comprises: generating the at least one reference metrology data set from the set of pulse width modulation values and the set of reference current amplitude values, and generating the plurality of metrology data sets to be corrected from the set of pulse width modulation values and the set of current amplitude values to be corrected such that each of the reference metrology data sets includes the reference current amplitude value and one of the set of pulse width modulation values, and each of the metrology data sets to be corrected includes one of the set of current amplitude values to be corrected and one of the set of pulse width modulation values.

In an embodiment of the present invention, the set of pwm values is a single pwm value, and the set of current amplitudes to be corrected includes a plurality of current amplitudes to be corrected; correspondingly, the generating the at least one reference metrology data set according to the set of pulse width modulation values and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the set of pulse width modulation values and the set of current amplitude values to be corrected includes: (a) Combining said single pulse width modulation value with said reference current amplitude value to generate one of said reference metrology data sets; and (b) combining the single pulse width modulation value and the plurality of current amplitudes to be corrected one by one to generate the plurality of measurement data sets to be corrected.

In one embodiment of the present invention, the set of pwm values includes a plurality of pwm values, and the set of current amplitudes to be corrected includes a plurality of current amplitudes to be corrected; correspondingly, the generating the at least one reference metrology data set according to the set of pulse width modulation values and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the set of pulse width modulation values and the set of current amplitude values to be corrected includes: (i) Combining the pulse width modulation values with the reference current amplitude value one by one to generate a plurality of reference measurement data sets equal to the pulse width modulation values; and (ii) combining the pwm values with the current amplitudes to be corrected in a one-to-one manner to generate the metrology data sets to be corrected, wherein the number of the metrology data sets to be corrected is equal to the number of the pwm values, and the pwm values included in the metrology data sets to be corrected are different from each other.

In one embodiment of the invention, the set of current amplitudes to be corrected consists of 2 ⁿ And the current amplitude to be corrected is formed, wherein n is the current amplitude bit depth of the target display device.

In one embodiment of the present invention, each of the reference image groups includes a red image, a green image, a blue image, and a white image, each of the reference brightness data groups includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, and each of the brightness data groups to be corrected includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data. The generating a plurality of complementary color coefficient sets based on the at least one reference luminance and chrominance data set and the plurality of luminance and chrominance data sets to be corrected comprises: (a) Obtaining a correction target value based on the white image brightness data in a target reference brightness data set, taking the red image brightness data, the green image brightness data and the blue image brightness data in a target brightness data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness data set is one of the at least one reference brightness data set, the target brightness data set to be corrected is one of the multiple brightness data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness data set, contain the same pulse width modulation value; or, (b) obtaining a correction target value based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target reference brightness and chrominance data set, taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness and chrominance data set is one of the at least one reference brightness and chrominance data set, the target brightness and chrominance data set to be corrected is one of the multiple brightness and chrominance data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness and chrominance data set, comprise the same pulse width modulation value.

In an embodiment of the present invention, the at least one reference image group is a reference image group and includes a red image, a green image, a blue image, and a white image, the at least one reference brightness data group is a reference brightness data group and includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data, each image group to be corrected includes a red image, a green image, a blue image, and a white image, and each brightness data group to be corrected includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data. The generating a plurality of complementary color coefficient sets based on the at least one reference luma and chroma data set and the plurality of luma and chroma data sets to be corrected comprises: (i) Taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, obtaining correction target values based on the white image brightness and chrominance data in the reference brightness and chrominance data set, the current amplitude to be corrected, the reference current amplitude and the gamma value corresponding to the target brightness and chrominance data set to be corrected, and carrying out matrix operation on the correction target values and the correction initial values to obtain corresponding complementary color coefficient sets, wherein the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected; or, (ii) taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, obtaining correction target values based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in the reference brightness and chrominance data set and the current amplitude to be corrected, the reference current amplitude and the gamma value corresponding to the target brightness and chrominance data set to be corrected, and performing matrix operation on the correction target values and the correction initial values to obtain corresponding complementary color coefficient sets, wherein the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected.

In an embodiment of the present invention, the display color cast correction method further includes: and outputting the mapping relation of the current amplitude to be corrected contained in each of the plurality of complementary color coefficient sets and the plurality of measured data sets to be corrected to the target display device for storage.

On the other hand, an embodiment of the present invention provides a display color cast correction apparatus, including: the device comprises a data generation module, a display control module, an acquisition control module and a coefficient generation module; the data generating module is used for generating at least one reference measurement data set and a plurality of measurement data sets to be corrected, wherein each reference measurement data set at least comprises a reference current amplitude value, and each measurement data set to be corrected at least comprises a current amplitude value to be corrected; the display control module is used for controlling a target display device to display at least one reference image group based on the at least one reference measured data group and controlling the target display device to display a plurality of image groups to be corrected based on the plurality of measured data groups to be corrected; the acquisition control module is used for controlling target acquisition equipment to acquire image data of the at least one reference image group to obtain at least one reference brightness and chrominance data group and controlling the target acquisition equipment to acquire image data of the plurality of image groups to be corrected to obtain a plurality of brightness and chrominance data groups to be corrected; and the coefficient generating module is used for generating a plurality of complementary color coefficient sets based on the at least one reference brightness and chrominance data set and the plurality of brightness and chrominance data sets to be corrected, wherein the plurality of complementary color coefficient sets respectively correspond to the current amplitude values to be corrected contained in the plurality of measurement data sets to be corrected.

The display color cast correction device of the embodiment generates the reference measurement data set and the measurement data set to be corrected, controls the display reference image set and the image set to be corrected based on the generated reference measurement data set and the measurement data set to be corrected, controls the acquisition equipment to acquire image data of the display reference image set and the image set to be corrected to obtain the reference brightness and chrominance data set and the brightness and chrominance data set to be corrected, and then generates the complementary color coefficient set based on the acquired reference brightness and chrominance data set and the brightness and chrominance data set to be corrected, so that complementary color coefficient sets corresponding to different current amplitudes can be obtained. And the generated complementary color coefficient set is subsequently applied to the target display device or other display devices in the same batch, so that the color cast compensation of the display device can be effectively realized.

In one embodiment of the present invention, the display color cast correction apparatus further includes: the acquisition module is used for acquiring a pulse width modulation value set, a reference current amplitude value and a current amplitude value set to be corrected; the data generation module is specifically configured to: generating the at least one reference metrology data set according to the pwm value set and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the pwm value set and the current amplitude value set to be corrected, such that each of the reference metrology data sets includes the reference current amplitude value and one pwm value in the pwm value set, and each of the metrology data sets to be corrected includes one pwm value in the current amplitude value set to be corrected and one pwm value in the pwm value set.

In an embodiment of the present invention, each of the reference image groups includes a red image, a green image, a blue image, and a white image, each of the reference brightness data groups includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, and each of the brightness data groups to be corrected includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data. The coefficient generation module is specifically configured to: (a) Taking the white image brightness data in a target reference brightness data set as a correction target value, taking the red image brightness data, the green image brightness data and the blue image brightness data in a target brightness data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness data set is one of the at least one reference brightness data set, the target brightness data set to be corrected is one of the multiple brightness data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness data set, contain the same pulse width modulation value; or (b) taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target reference brightness and chrominance data set as correction target values, taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, and performing matrix operation on the correction target values and the correction initial values to obtain corresponding complementary color coefficient sets, wherein the target reference brightness and chrominance data set is one of the at least one reference brightness and chrominance data set, the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness and chrominance data set, comprise the same pulse width modulation value.

In an embodiment of the present invention, the at least one reference image group is a reference image group and includes a red image, a green image, a blue image, and a white image, the at least one reference brightness-and-chroma data group is a reference brightness-and-chroma data group and includes red image brightness-and-chroma data, green image brightness-and-chroma data, blue image brightness-and-chroma data, and the image group to be corrected includes a red image, a green image, a blue image, and a white image, and the brightness-and-chroma data group to be corrected includes red image brightness-and-chroma data, green image brightness-and-chroma data, blue image brightness-and-chroma data, and white image brightness-and-chroma data. The coefficient generation module is specifically configured to: (i) Obtaining a correction target value based on the white image brightness data, the reference current amplitude and the gamma value in the reference brightness data set, taking the red image brightness data, the green image brightness data and the blue image brightness data in each brightness data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set; or, (ii) a correction target value is obtained based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in the reference brightness and chrominance data set, the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in each brightness and chrominance data set to be corrected are used as correction initial values, and matrix operation is performed on the correction target values and the correction initial values to obtain a corresponding complementary color coefficient set.

In one embodiment of the present invention, the display color cast correction apparatus further includes: and the output module is used for outputting the mapping relation of the current amplitude to be corrected contained in each of the plurality of complementary color coefficient sets and the plurality of measured data sets to be corrected to the target display device for storage.

In another aspect, a system for correcting color cast in a display provided by an embodiment of the present invention includes: a correction computer for executing the display color cast correction method according to any one of the preceding embodiments; the display controller is in signal connection with the correction computer to the target display device; and the acquisition equipment is in signal connection with the correction computer and serves as the target acquisition equipment.

The technical scheme has the following advantages: the complementary color coefficient sets corresponding to different current amplitudes can be obtained by generating a reference measurement data set and a measurement data set to be corrected, controlling to display a reference image group and an image group to be corrected based on the generated reference measurement data set and the measurement data set to be corrected, controlling acquisition equipment to acquire image data of the display reference image group and the image group to be corrected to obtain a reference brightness and chrominance data set and a brightness and chrominance data set to be corrected, and then generating complementary color coefficient sets based on the acquired reference brightness and chrominance data set and the brightness and chrominance data set to be corrected. And the generated complementary color coefficient set is subsequently applied to the target display device or other display devices in the same batch, so that the color cast compensation of the display device can be effectively realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flowchart of a method for correcting color cast according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a partial flow chart of another display color cast correction method according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a part of a process of another display color cast correction method according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a display color cast correction system according to an embodiment of the present invention.

Fig. 5 is a schematic block diagram of a display color cast correction apparatus according to an embodiment of the present invention.

Fig. 6 is a block diagram of another display color cast correction apparatus according to an embodiment of the present invention.

Fig. 7 is a block diagram of another display color cast correction apparatus according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a display color cast correction system according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a computer storage medium according to an embodiment of the present invention.

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.

[ first embodiment ] A method for manufacturing a semiconductor device

Referring to fig. 1, a method for correcting color cast in a display according to an embodiment of the present invention includes the following steps S11, S12, S13, S14, S15, and S16.

S11: generating at least one reference metrology data set and a plurality of metrology data sets to be corrected, wherein each of the reference metrology data sets comprises at least one reference current amplitude value and each of the metrology data sets to be corrected comprises at least one current amplitude value to be corrected;

s12: controlling a target display device to display at least one reference image group based on the at least one reference metrology data group;

s13: controlling the target acquisition equipment to acquire image data of the at least one reference image group to obtain at least one reference brightness and chrominance data group;

s14: controlling the target display device to display a plurality of groups of images to be corrected based on the plurality of groups of measured data to be corrected;

s15: controlling the target acquisition equipment to acquire image data of the plurality of image groups to be corrected so as to obtain a plurality of brightness and chrominance data groups to be corrected;

s16: generating a plurality of complementary color coefficient sets based on the at least one reference brightness and chrominance data set and the plurality of brightness and chrominance data sets to be corrected, wherein the plurality of complementary color coefficient sets respectively correspond to the current amplitude values to be corrected contained in the plurality of measurement data sets to be corrected.

The display color cast correction method of the embodiment generates a reference measurement data set and a measurement data set to be corrected, controls to display a reference image group and an image group to be corrected based on the generated reference measurement data set and the measurement data set to be corrected, controls an acquisition device to acquire image data of the display reference image group and the image group to be corrected to obtain a reference brightness and chrominance data set and a brightness and chrominance data set to be corrected, and then generates a complementary color coefficient set based on the acquired reference brightness and chrominance data set and the brightness and chrominance data set to be corrected, so that complementary color coefficient sets corresponding to different current amplitudes can be obtained. And the generated complementary color coefficient set is subsequently applied to the target display device or other display devices in the same batch, so that the color cast compensation of the display device can be effectively realized. The target display device comprises an LED display box body or an LED display screen formed by splicing a plurality of LED display box bodies, wherein a single LED display box body comprises a module controller (or called a receiving card, a scanning card and a display control card) and one or more LED lamp panels in signal connection with the module controller; the LED lamp panel can be a monochromatic LED lamp panel, a bicolor LED lamp panel, a RGB full-color LED lamp panel or even more primary color LED lamp panels, and the LED lamp is adopted to construct the display pixels.

In order to make the display color shift correction method of the present embodiment more clearly understood, the RGB full-color LED display panel is taken as an example of the target display device, and three specific embodiments are listed and described in detail with reference to the display color shift correction system shown in fig. 4

[ first embodiment ] to provide a toner

The embodiment is a color cast correction method under hybrid modulation, hybrid modulation is defined as coexistence of a PWM signal and a current PAM signal, and in the PAM modulation process, a current amplitude changes, and a spectral characteristic of an LED changes, which may cause color cast, so that color cast correction is required. The specific steps of the embodiment are as follows:

referring to fig. 1,2 and 4, first, the calibration computer 100 may execute step S10: and acquiring a pulse width modulation value set, a reference current amplitude value and a current amplitude value set to be corrected. For example, the set of pulse width modulation values (or PWM values) is a single PWM value such as 65535, the reference current amplitude (or reference current PAM value) is such as 255, and the set of current amplitude values to be corrected includes a plurality of current amplitude values to be corrected (or current PAM values to be corrected) such as 0, 1,2, 3, \\ 8230;, 255; therefore, the color cast correction under different PAM values of the current to be corrected in the full bit depth range under a single PWM value can be realized. More specifically, the correction computer 100 may operate the PWM value input field input 65535, the reference current PAM value input field input 255, and the bit depth input field input 8 of the current PAM value to be corrected on the user interface displayed by the correction software, and then the correction computer 100 may calculate, according to the bit depth input field input 8, that the current PAM value to be corrected is respectively 0 to 255 and 2 in total ⁸ =256 current PAM values. Certainly, a current PAM value change step input field to be corrected can be further set, and if the input value of the current PAM value change step input field to be corrected is 1, the input value 8 of the corresponding bit depth input field can obtain a current PAM value to be corrected of 0 to 255; if the step size of the input is 4, the input value 8 corresponding to the bit depth input field can obtain 64 current PAM values of 0, 4, 8, \ 8230;, 252, etc. Furthermore, it is understood that the respective current PAM values to be corrected may also be directly input at the user interface. The calibration computer 100 may be a desktop computer or a notebook computer, but the embodiment of the invention is not limited thereto.

Then, a specific step S11a is executed by the correction computer 100 in step S11: generating the at least one reference metrology data set according to the pwm value set and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the pwm value set and the current amplitude value set to be corrected, such that each of the reference metrology data sets includes the reference current amplitude value and one pwm value in the pwm value set, and each of the metrology data sets to be corrected includes one pwm value in the current amplitude value set to be corrected and one pwm value in the pwm value set. For example, for the PWM value 65535, the reference current PAM value 255, and the current to be corrected PAM values 0 to 255, combining the PWM value 65535 with the reference current PAM value 255 may obtain a reference measurement data set [255,65535], and combining the PWM value 65535 with the current to be corrected PAM values 0 to 255 one by one may obtain 256 measurement data sets to be corrected [0,65535], [1,65535], [2,65535], \ 8230; [255,65535]; from the reference metrology data set, for example, it includes a PWM value and a reference current PAM value; as an example of the plurality of measurement data sets to be corrected, each measurement data set to be corrected includes a PWM value and a current PAM value to be corrected, and the current PAM values included in the measurement data sets to be corrected are different from each other.

Next, step S12 is performed by the calibration computer 100, for example, generating a control signal based on the reference metrology data set [255,65535] to control the display device 400 to display a reference image set, for example, sequentially displaying a red image, a green image, a blue image and a white image, via the display controller 200 signaling the calibration computer 100 to the display device 400; of course, the display order of the red image, the green image, the blue image and the white image is not limited herein. The display controller 200 here includes, for example, a microprocessor (such as an MCU or an ARM processor) and a programmable logic device electrically connected to the microprocessor, but the embodiment of the present invention is not limited thereto, and a hardware structure similar to a conventional mature transmitting card or system controller in an LED display control system may also be adopted.

In the process of controlling the display device 400 to display the red image, the green image, the blue image and the white image in the reference image group, step S13 is executed by the correction computer 100, for example, the collecting device 300 connected to the correction computer 100 through the control signal collects image data of the red image, the green image, the blue image and the white image which are sequentially displayed to obtain red image brightness data, green image brightness data, blue image brightness data and white image brightness data as a reference brightness data group. The capture device 300 is, for example, a luminance colorimeter, but the embodiment of the invention is not limited thereto; the luminance data of each color image in the reference luminance data set may be represented by XYZ tristimulus values, or may be represented by luminance-color separation color space three components such as Lxy, but the embodiment of the present invention is not limited thereto.

Similarly, step S14 is performed by the calibration computer 100, for example, to generate control signals to control the display device 400 to sequentially display 256 sets of images to be calibrated via the display controller 200 based on 256 sets [0,65535], [1,65535], [2,65535], \\ 8230 ], [255,65535] of metrology data to be calibrated, each set of images to be calibrated including, for example, sequentially displaying a red image, a green image, a blue image, and a white image; of course, the display order of the red image, the green image, the blue image and the white image is not limited herein.

In the process of controlling the display device 400 to display the red image, the green image, the blue image and the white image in each of the image groups to be corrected, the correction computer 100 executes step S15, for example, by controlling the acquisition device 300 to acquire image data of the red image, the green image, the blue image and the white image which are sequentially displayed to obtain red image brightness data, green image brightness data, blue image brightness data and white image brightness data as a brightness data group to be corrected, and then 256 brightness data groups to be corrected corresponding to 256 measurement data groups [0,65535], [1,65535], [2,65535], [ 828230 ], [255,65535] can be obtained. Here, the luminance and chrominance data of each color image in a single luminance and chrominance data set to be corrected may be represented by XYZ tristimulus values, or may be represented by three components of a luminance and chrominance separation color space, such as Lxy, but the embodiment of the present invention is not limited thereto.

Thereafter, step S16 is executed by the correction computer 100 to generate 256 complementary color coefficient sets. For example, when the PAM value of the current to be corrected is C1 (equal to the current to be corrected)Any one of positive current PAM values 0-255), the collected red (R) image brightness data, green (G) image brightness data, blue (B) image brightness data and white (W) image brightness data are respectively (X) _r1 Y _r1 Z _r1 )、(X _g1 Y _g1 Z _g1 )、(X _b1 Y _b1 Z _b1 ) And (X) _w1 Y _w1 Z _w1 ) To be used as a brightness and chrominance data group to be corrected; when the reference current PAM value is Cref (equal to the reference current PAM value 255), the collected red image luminance and chrominance data, green image luminance and chrominance data, blue image luminance and chrominance data, and white image luminance and chrominance data are (X) respectively _rf Y _rf Z _rf )、(X _gf Y _gf Z _gf )、(X _bf Y _bf Z _bf ) And (X) _wf Y _wf Z _wf ) As a reference luma bit data set. The generation of the complementary color coefficient set here can be done in two ways:

[ MEANS FOR solving PROBLEMS ] A method for producing a catalyst

White image luminance data (X) in the reference luminance data set _wf Y _wf Z _wf ) (or on the basis of the above-mentioned correction, making a certain brightness correction and keeping the chroma constant) to set it as correction target value, and the red image brightness and chroma data, green image brightness and chroma data and blue image brightness and chroma data (X) in the brightness and chroma data set to be corrected are used _r1 Y _r1 Z _r1 )、(X _g1 Y _g1 Z _g1 )、(X _b1 Y _b1 Z _b1 ) And as a correction initial value, performing the following matrix operation on the correction target value and the correction initial value to obtain a corresponding complementary color coefficient group:

the adoption of the first three complementary color coefficients is beneficial to reducing the use of the storage space and the data calculation amount in the subsequent color cast correction.

[ MEANS FOR SECOND ]

Red image brightness data, green image brightness data and blue image brightness data (X) in the reference brightness data set _rf Y _rf Z _rf )、(X _gf Y _gf Z _gf )、(X _bf Y _bf Z _bf ) (or on the basis of the above-mentioned correction, making a certain brightness correction and keeping the chroma constant) to set it as correction target value, and the red image brightness and chroma data, green image brightness and chroma data and blue image brightness and chroma data (X) in the brightness and chroma data set to be corrected are used _r1 Y _r1 Z _r1 )、(X _g1 Y _g1 Z _g1 )、(X _b1 Y _b1 Z _b1 ) And as a correction initial value, performing the following matrix operation on the correction target value and the correction initial value to obtain a corresponding complementary color coefficient group:

the second method is advantageous to improve the accuracy of color cast correction by using nine complementary color coefficients.

[ second embodiment ] to provide a medicine for treating diabetes

The embodiment is another color cast correction method under mixed modulation, and the specific steps are as follows:

referring to fig. 1,2 and 4, first, the calibration computer 100 may execute step S10: and acquiring a pulse width modulation value set, a reference current amplitude value and a current amplitude value set to be corrected. For example, the set of pulse width modulation values (or PWM values) includes a plurality of PWM values such as 256 PWM values, e.g., 0, 256, 512, 768, 8230; 65280, etc.; the reference current amplitude (or referred to as a reference current PAM value) is 255, and the current amplitude set to be corrected comprises a plurality of current amplitudes (or referred to as current PAM values) to be corrected, such as 0, 1,2, 3, \\ 8230;, 255; therefore, the PWM + PAM mixed color cast correction under different PAM values of the current to be corrected can be realized. More specifically, the correction computer 100 may run a PWM value bit depth input field input 16 (or a maximum value input 65280 of the PWM value), a PWM value change step length input field input 256, a reference current PAM value input field input 255, and a bit depth input field input 8 of the current to be corrected PAM value of the user interface displayed by the correction software, so that the correction computer 100 may calculate 256 PWM values 0, 256, 512, 768, 8230, 65280, and 256 current to be corrected PAM values 0 to 255. Certainly, a to-be-corrected current PAM value change step input field may also be set, and if the input value of the to-be-corrected current PAM value change step input field is 1,256 current PAM values 0 to 255 can be obtained corresponding to an input value 8 of the bit depth input field; if the step size of the input is 4, the input value 8 corresponding to the bit depth input field can obtain 64 current PAM values of 0, 4, 8, \ 8230;, 252, etc. Furthermore, it is understood that the respective PWM values and the respective current to be corrected PAM values may also be directly input at the user interface.

Then, a specific step S11a is executed by the correction computer 100 in step S11: generating the at least one reference metrology data set from the set of pulse width modulation values and the set of reference current amplitude values, and generating the plurality of metrology data sets to be corrected from the set of pulse width modulation values and the set of current amplitude values to be corrected such that each of the reference metrology data sets includes the reference current amplitude value and one of the set of pulse width modulation values, and each of the metrology data sets to be corrected includes one of the set of current amplitude values to be corrected and one of the set of pulse width modulation values. For example, for PWM values 0, 256, 512, 768, 8230, 65280, reference current PAM value 255 and current PAM values 0-255 to be corrected, PWM values 0, 256, 512, 768, 8230, 65280 are combined with reference current PAM value 255 one by one to obtain 256 reference measurement data sets [255,0], [255,256], [255,512], [255,768], [ 8230 ], and [255,65280], and PWM values 0, 256, 512, 768, 8230, 65280 and current PAM values 0-255 to be corrected are combined in a one-to-one manner to obtain 256 measurement data sets [0,0], [1,256], [2,512], [3,768], [ 8230 ], [255,65280]; as an example, each of the plurality of reference metrology data sets comprises a PWM value and a reference current PAM value, and the number of the plurality of reference metrology data sets is equal to the number of the plurality of PWM values; as an example of the plurality of to-be-corrected measurement data sets, each of the plurality of to-be-corrected measurement data sets includes a PWM value and a to-be-corrected current PAM value, the number of the plurality of to-be-corrected measurement data sets is equal to the number of the plurality of PWM values, and the plurality of to-be-corrected measurement data sets respectively include the plurality of PWM values different from each other.

Next, step S12 is executed by the calibration computer 100, for example, generating control signals to control the display device 400 to sequentially display 256 reference image groups, each of which includes, for example, a red image, a green image, a blue image, and a white image, which are sequentially displayed, via the display controller 200, based on 256 reference metrology data groups [255,0], [255,256], [255,512], [255,768], \8230 ], [255,65280]; of course, the display order of the red image, the green image, the blue image and the white image is not limited herein.

In the process of controlling the display device 400 to display the red image, the green image, the blue image and the white image in each of the reference image groups, the calibration computer 100 executes step S13, for example, by controlling the acquisition device 300 to acquire image data of the red image, the green image, the blue image and the white image which are sequentially displayed to obtain red image brightness data, green image brightness data, blue image brightness data and white image brightness data as a reference brightness data group, thereby obtaining 256 reference brightness data groups corresponding to 256 reference measurement data groups [255,0], [255,256], [255,512], [255,768], \\ 8230and [255,65280 ]. The luminance data of each color image in the single reference luminance data set may be represented by XYZ tristimulus values, or may be represented by luminance-color separation color space three components such as Lxy, but the embodiment of the present invention is not limited thereto.

Similarly, step S14 is executed by the calibration computer 100, for example, to generate control signals to control the display device 400 to sequentially display 256 sets of images to be calibrated via the display controller 200 based on 256 sets of metrology data to be calibrated [0,0], [1,256], [2,512], [3,768], \\ 8230; [255,65280], each of which includes, for example, sequentially displaying a red image, a green image, a blue image, and a white image; of course, the display order of the red image, the green image, the blue image and the white image is not limited herein.

In the process of controlling the display device 400 to display the red image, the green image, the blue image and the white image in each of the image groups to be corrected, the correction computer 100 executes step S15, for example, by controlling the acquisition device 300 to acquire image data of the sequentially displayed red image, green image, blue image and white image to obtain red image brightness data, green image brightness data, blue image brightness data and white image brightness data as a brightness data group to be corrected, so as to obtain 256 brightness data groups to be corrected, which correspond to 256 measured data groups [0,0], [1,256], [2,512], [3,768], [ 8230 ], [255,65280 ]. Here, the luminance and chrominance data of each color image in a single luminance and chrominance data set to be corrected may be represented by XYZ tristimulus values, or may be represented by three components of a luminance and chrominance separation color space, such as Lxy, but the embodiment of the present invention is not limited thereto.

Thereafter, step S16 is executed by the correction computer 100 to generate 256 complementary color coefficient groups. For example, when the PWM value is P1 (equal to any of the aforementioned PWM values 0, 256, 512, 768, 8230; 65280) and the current to be corrected PAM value is C1 (equal to any of the aforementioned current to be corrected PAM values 0 to 255), the collected red (R) image luminance and chrominance data, green (G) image luminance and chrominance data, blue (B) image luminance and chrominance data, and white (W) image luminance and chrominance data are (X) respectively _r1 Y _r1 Z _r1 )、(X _g1 Y _g1 Z _g1 )、(X _b1 Y _b1 Z _b1 ) And (X) _w1 Y _w1 Z _w1 ) To be used as a brightness and chrominance data group to be corrected; when the PWM value is P1 and the reference current PAM value is Cref (equal to the reference current PAM value 255), the collected red image luminance and chrominance data, the collected green image luminance and chrominance data, the collected blue image luminance and chrominance data, and the collected white image luminance and chrominance data are (X) respectively _rf Y _rf Z _rf )、(X _gf Y _gf Z _gf )、(X _bf Y _bf Z _bf ) And (X) _wf Y _wf Z _wf ) As a reference luminance-value data set. The generation of the complementary color coefficient set here can be done in two ways:

[ MEANS FOR solving PROBLEMS ] A method for producing a high-purity magnesium alloy

White image luminance data (X) in the reference luminance data group corresponding to the PWM value P1 _wf Y _wf Z _wf ) (or make certain brightness correction and keep chroma unchanged on the basis of the brightness correction) is set as a correction target value, and red image brightness and chroma data, green image brightness and chroma data and blue image brightness and chroma data (X) in the brightness and chroma data set to be corrected corresponding to the PWM value P1 are set as correction target values _r1 Y _r1 Z _r1 )、(X _g1 Y _g1 Z _g1 )、(X _b1 Y _b1 Z _b1 ) And as a correction initial value, performing the following matrix operation on the correction target value and the correction initial value to obtain a corresponding complementary color coefficient group:

[ MEANS FOR SECOND ]

Red image luminance data, green image luminance data, and blue image luminance data (X) in the reference luminance data group corresponding to the PWM value P1 _rf Y _rf Z _rf )、(X _gf Y _gf Z _gf )、(X _bf Y _bf Z _bf ) (or make certain brightness correction and keep chroma unchanged on the basis of the brightness correction) is set as a correction target value, and red image brightness and chroma data, green image brightness and chroma data and blue image brightness and chroma data (X) in the brightness and chroma data set to be corrected corresponding to the PWM value P1 are set as correction target values _r1 Y _r1 Z _r1 )、(X _g1 Y _g1 Z _g1 )、(X _b1 Y _b1 Z _b1 ) And as a correction initial value, performing the following matrix operation on the correction target value and the correction initial value to obtain a corresponding complementary color coefficient group:

the adoption of the nine complementary color coefficients of the second mode is beneficial to improving the color cast correction precision.

[ MEANS FOR CARRYING OUT THE INVENTION ] A

The present embodiment is a method for correcting color cast under PAM modulation, and is different from the aforementioned [ first embodiment ] and [ second embodiment ] in that compensation cannot be performed by a PWM signal when an LED display is modulated by a Pure Amplitude Modulation (PAM) method. The method comprises the following specific steps:

referring to fig. 1 and 4, first, a reference current amplitude and a set of current amplitudes to be corrected may be obtained by the correction computer 100. For example, for a 10-bit PAM modulation LED display screen, the reference current amplitude (or referred to as a reference current PAM value) is 1023, and the set of current amplitudes to be corrected includes a plurality of current amplitudes to be corrected (or referred to as current PAM values) such as 0, 16, 32, 48, \ 8230;, 1008. More specifically, the calibration computer 100 may run a reference current PAM value input 1023 of the user interface displayed by the calibration software, and the bit depth input field and the change step size input field of the current PAM value to be calibrated are respectively input 10 and 16, so that the calibration computer 100 may calculate 64 current PAM values respectively 0, 16, 32, 48, 8230301008 and 1008 according to the input values 10 and 16 of the bit depth input field and the change step size input field. Furthermore, it is understood that the respective current PAM values to be corrected may also be directly input at a user interface. In addition, based on the fact that the product of the PWM value and the current PAM value is equal to the LED lamp point display brightness, a PWM value input field may be set to input 1 on the user interface of the correction software to set the current color cast correction to the color cast correction under PAM modulation.

Then, step S11 is executed by the calibration computer 100 to generate a reference metrology data set and a plurality of metrology data sets to be calibrated. For example, with reference current PAM value 1023 and current PAM values 0, 16, 32, 48, \ 8230;, 1008, one reference measurement data set [1023] can be obtained from reference current PAM value 1023, and 64 measurement data sets [0], [16], [32], [48], [ 8230 ], [1008] can be obtained from current PAM values 0, 16, 32, 48, \ 8230; [1008]; from the reference measurement data set, for example, it includes a reference current PAM value; as can be seen from the examples of the multiple measurement data sets to be corrected, each measurement data set to be corrected includes a current PAM value to be corrected, and the current PAM values to be corrected included in the measurement data sets to be corrected are different from each other.

Next, step S12 is executed by the calibration computer 100, for example, generating a control signal based on the reference metrology data set [1023] to control the display device 400 via the display controller 200 to display a reference image set, for example, a red image, a green image, a blue image, and a white image in sequence; of course, the display order of the red image, the green image, the blue image and the white image is not limited herein.

In controlling the display device 400 to display the red image, the green image, the blue image, and the white image in the reference image group, step S13 is executed by the correction computer 100, for example, by controlling the capturing device 300 to capture image data of the red image, the green image, the blue image, and the white image that are sequentially displayed to obtain red image luminance degree data, green image luminance degree data, blue image luminance degree data, and white image luminance degree data as one reference luminance degree data group. The luminance data of each color image in the reference luminance data set may be represented by XYZ tristimulus values, or may be represented by luminance-color separation color space three components such as Lxy, but the embodiment of the present invention is not limited thereto.

Similarly, step S14 is performed by the calibration computer 100, for example, to generate control signals to control the display device 400 to sequentially display 64 image groups to be calibrated via the display controller 200 based on 64 metrology data groups to be calibrated [0], [16], [32], [48], \ 8230 ], [1008], [ each image group to be calibrated, for example, including sequentially displaying a red image, a green image, a blue image and a white image; of course, the display order of the red image, the green image, the blue image and the white image is not limited herein.

In the process of controlling the display device 400 to display the red image, the green image, the blue image and the white image in each of the image groups to be corrected, the correction computer 100 executes step S15, for example, by controlling the acquisition device 300 to acquire image data of the sequentially displayed red image, green image, blue image and white image to obtain red image brightness data, green image brightness data, blue image brightness data and white image brightness data as a brightness data group to be corrected, so as to obtain 64 brightness data groups to be corrected corresponding to 64 measurement data groups [0], [16], [32], [48], \ 8230 ], [1008 ]. Here, the luminance and chrominance data of each color image in a single luminance and chrominance data set to be corrected may be represented by XYZ tristimulus values, or may be represented by three components of a luminance and chrominance separation color space, such as Lxy, but the embodiment of the present invention is not limited thereto.

Thereafter, step S16 is executed by the correction computer 100 to generate 64 complementary color coefficient groups. For example, when the PAM value of the current to be corrected is PAM (i) (equal to any one of the aforementioned PAM values 0, 16, 32, 48, 8230; and 1008) the collected red (R), green (G), blue (B), and white (W) image luminance and chrominance data are (X) respectively _r (i) Y _r (i) Z _r (i))、(X _g (i) Y _g (i) Z _g (i))、(X _b (i) Y _b (i) Z _b (i) And (X) _w (i) Y _w (i) Z _w (i) As a set of luminance and chrominance data to be corrected; when the reference current PAM value is PAMref (equal to the reference current PAM value 1023), the collected red image luminance data, green image luminance data, blue image luminance data, and white image luminance data are (X) respectively _rf Y _rf Z _rf )、(X _gf Y _gf Z _gf )、(X _bf Y _bf Z _bf ) And (X) _wf Y _wf Z _wf ) As a reference luminance-value data set. The generation of the complementary color coefficient set here can be done in two ways:

Taking the red image brightness data, the green image brightness data and the blue image brightness data in each brightness data set to be corrected as correction initial values, and based on the white image brightness data (X) in the reference brightness data set _wf Y _wf Z _wf ) Calculating a current PAM value (PAM (i) to be corrected), a reference current PAM value (1023 for example) and a set gamma value gamma (2.8 for example) to obtain a correction target value:

Y _wtar (i)＝Y _wf ×(PAM(i)/1023) ^gamma

X _wtar (i)＝Y _tar (i)/Y _wf ×X _wf

Z _wtar (i)＝Y _tar (i)/Y _wf ×Z _wf

and then, carrying out matrix operation on the correction target value and the correction initial value as follows to obtain a corresponding complementary color coefficient group:

[ MEANS FOR SECOND ]

Taking the red image brightness data, the green image brightness data and the blue image brightness data in each brightness data set to be corrected as correction initial values, and based on the red image brightness data, the green image brightness data and the blue image brightness data (X) in the reference brightness data set _rf Y _rf Z _rf )、(X _gf Y _gf Z _gf )、(X _bf Y _bf Z _bf ) And calculating a PAM value (PAM (i) of the current to be corrected, a PAM value (1023 for example) of the reference current and a gamma value (2.8 for example) set to obtain a correction target value:

Y _rtar (i)＝Y _rf ×(PAM(i)/1023) ^gamma

X _rtar (i)＝Y _rtar (i)/Y _rf ×X _rf

Z _rtar (i)＝Y _rtar (i)/Y _rf ×Z _rf

Y _gtar (i)＝Y _gf ×(PAM(i)/1023) ^gamma

X _gtar (i)＝Y _gtar (i)/Y _gf ×X _gf

Z _gtar (i)＝Y _gtar (i)/Y _gf ×Z _gf

Y _btar (i)＝Y _bf ×(PAM(i)/1023) ^gamma

X _btar (i)＝Y _btar (i)/Y _bf ×X _bf

Z _btar (i)＝Y _btar (i)/Y _bf ×Z _bf

Referring to fig. 3, the method for correcting color cast in a display according to the embodiment of the present invention may further include, after step S16, step S17: and outputting a mapping relation (for example, in the form of a look-up table) of the current amplitude to be corrected, which is contained in each of the plurality of complementary color coefficient sets and the plurality of measurement data sets to be corrected, to the target display device for storage. The mapping relationship here may be stored in a local memory of the display apparatus 400, for example, in a memory of a module controller. In addition, the mapping relationship may be stored in a database for backup, so that the mapping relationship may also be stored in other display devices in the same batch as the display device 400.

It is understood that, after the display device 400 stores the mapping relationship described in step S17, it may apply the complementary color coefficient set in the mapping relationship to perform color cast compensation, and the specific compensation principle is, for example:

(1) In a display device using a hybrid modulation scheme, after obtaining a PWM signal (Rin, gin, bin) and a current PAM value for each display pixel, different complementary color coefficient sets are selected according to the different current PAM values (generated based on the foregoing [ embodiment one ] or [ embodiment two ]), and the complementary color coefficient sets are applied to the PWM signal (Rin, gin, bin), thereby obtaining data after compensating for color shift:

or,

(1) In a display device using the PAM modulation method, after obtaining a PAM value (Rin, gin, bin) of a current for each display pixel, correction is performed using, for example, a complementary color coefficient set generated as described in [ embodiment three ] above to obtain data after color shift compensation

Or,

it should be noted that the values and numbers of the PWM values, the values of the reference current PAM value, and the values and numbers of the current to be corrected PAM value in the foregoing embodiments are only illustrative examples, and are not intended to limit the embodiments of the present invention. Furthermore, the color images included in the reference image data set and the image data set to be corrected may not include a white image, and the white image brightness data used in the process of generating the complementary color coefficient set may be calculated from the collected red image brightness data, green image brightness data, and blue image brightness data.

[ second embodiment ]

Referring to fig. 5, a display color cast correction apparatus 50 according to an embodiment of the present invention includes: a data generation module 501, a display control module 503, an acquisition control module 505, and a coefficient generation module 507.

The data generating module 501 is, for example, configured to generate at least one reference metrology data set and a plurality of metrology data sets to be corrected, where each of the reference metrology data sets at least includes a reference current amplitude, and each of the metrology data sets to be corrected at least includes a current amplitude to be corrected;

the display control module 503 is configured to control a target display apparatus to display at least one reference image group based on the at least one reference metrology data set, and to control the target display apparatus to display a plurality of image groups to be corrected based on the plurality of metrology data sets to be corrected, for example;

the acquisition control module 505 is, for example, configured to control a target acquisition device to perform image data acquisition on the at least one reference image group to obtain at least one reference brightness and chrominance data group, and to control the target acquisition device to perform image data acquisition on the multiple image groups to be corrected to obtain multiple brightness and chrominance data groups to be corrected; and

the coefficient generation module 507 is configured to generate a plurality of complementary color coefficient sets based on the at least one reference luminance and chrominance data set and the plurality of luminance and chrominance data sets to be corrected, wherein the plurality of complementary color coefficient sets respectively correspond to the current amplitude values to be corrected, which are respectively contained in the plurality of measurement data sets to be corrected.

As for specific functional details of the data generating module 501, the display control module 503, the collecting control module 505, and the coefficient generating module 507, reference may be made to the related descriptions of steps S11 to S16 of the display color cast correction method in the foregoing first embodiment, and details are not repeated here. Furthermore, it should be noted that the data generating module 501, the display control module 503, the collecting control module 505 and the coefficient generating module 507 may be software modules, which are stored in the non-volatile memory and executed by the processor to perform the steps S11 to S16 of the display color cast correcting method in the foregoing first embodiment.

The display color cast correction device 50 of the embodiment generates the reference measurement data set and the measurement data set to be corrected, controls the display reference image set and the image set to be corrected based on the generated reference measurement data set and the measurement data set to be corrected, controls the acquisition device to acquire image data of the display reference image set and the image set to be corrected to obtain the reference brightness and chrominance data set and the brightness and chrominance data set to be corrected, and then generates the complementary color coefficient set based on the acquired reference brightness and chrominance data set and the brightness and chrominance data set to be corrected, so that complementary color coefficient sets corresponding to different current amplitudes can be obtained. And the generated complementary color coefficient set is subsequently applied to the target display device or other display devices in the same batch, so that the color cast compensation of the display device can be effectively realized.

As shown in fig. 6, in a specific embodiment, the display color shift correction apparatus further includes: an obtaining module 500, for example, configured to obtain a set of pulse width modulation values, a reference current amplitude value, and a set of current amplitude values to be corrected; correspondingly, the data generating module 501 is specifically configured to: generating the at least one reference metrology data set according to the pwm value set and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the pwm value set and the current amplitude value set to be corrected, such that each of the reference metrology data sets includes the reference current amplitude value and one pwm value in the pwm value set, and each of the metrology data sets to be corrected includes one pwm value in the current amplitude value set to be corrected and one pwm value in the pwm value set. The present embodiment is suitable for display color cast correction under hybrid modulation.

Further, in a specific embodiment, each of the reference image groups includes a red image, a green image, a blue image, and a white image, each of the reference luminance data groups includes red image luminance data, green image luminance data, blue image luminance data, and white image luminance data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, and each of the luminance data groups to be corrected includes red image luminance data, green image luminance data, blue image luminance data, and white image luminance data; the coefficient generation module 507 is specifically configured to: (a) Obtaining a correction target value based on the white image brightness data in a target reference brightness data set, taking the red image brightness data, the green image brightness data and the blue image brightness data in a target brightness data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness data set is one of the at least one reference brightness data set, the target brightness data set to be corrected is one of the multiple brightness data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness data set, contain the same pulse width modulation value; or, (b) obtaining a correction target value based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target reference brightness and chrominance data set, taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness and chrominance data set is one of the at least one reference brightness and chrominance data set, the target brightness and chrominance data set to be corrected is one of the multiple brightness and chrominance data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness and chrominance data set, comprise the same pulse width modulation value. The present embodiment is applicable to generating a complementary color coefficient set in a display color cast correction method under hybrid modulation.

Furthermore, in a specific embodiment, the at least one reference image group is a reference image group and includes a red image, a green image, a blue image and a white image, the at least one reference brightness data group is a reference brightness data group and includes red image brightness data, green image brightness data, blue image brightness data and white image brightness data, each image group to be corrected includes a red image, a green image, a blue image and a white image, and each brightness data group to be corrected includes red image brightness data, green image brightness data, blue image brightness data and white image brightness data; the coefficient generation module 507 is specifically configured to: (i) Taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, obtaining correction target values based on the white image brightness and chrominance data in the reference brightness and chrominance data set, the current amplitude to be corrected, the reference current amplitude and the gamma value corresponding to the target brightness and chrominance data set to be corrected, and carrying out matrix operation on the correction target values and the correction initial values to obtain corresponding complementary color coefficient sets, wherein the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected; or (ii) taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, obtaining correction target values based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in the reference brightness and chrominance data set and the current amplitude to be corrected, the reference current amplitude and the gamma value corresponding to the target brightness and chrominance data set to be corrected, and performing matrix operation on the correction target values and the correction initial values to obtain corresponding complementary color coefficient sets, wherein the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected. The embodiment is suitable for generating the complementary color coefficient group in the method for correcting the display color cast under pure PAM modulation.

In addition, as shown in fig. 7, in one embodiment, the display color cast correction device further includes: the output module 509 is, for example, configured to output, to the target display device for storage, a mapping relationship between the current amplitudes to be corrected, which are included in each of the complementary color coefficient sets and the measurement data sets to be corrected. Of course, the mapping relationship output by the output module 509 may also be stored in a database for backup or application to other display devices in the same batch.

[ third embodiment ]

As shown in fig. 8, a display color cast correction system 800 according to a third embodiment of the present invention includes: a processor 801 and a memory 803; the memory 803 stores instructions that are executed by the processor 801 and that, for example, cause the processor 801 to perform operations to perform the display color cast correction method described in the foregoing first embodiment.

[ fourth example ] A

As shown in fig. 9, a computer-readable storage medium 900 according to a fourth embodiment of the present invention is a non-volatile memory and stores program codes, and when the program codes are executed by one or more processors, the one or more processors are caused to execute the method for correcting color cast in the display according to the first embodiment.

In addition, it should be understood that the foregoing embodiments are merely exemplary of the present invention, and the technical solutions of the embodiments may be arbitrarily combined and used without conflict between technical features and structures and without departing from the purpose of the present invention.

Furthermore, it should be appreciated that in the embodiments provided by the present invention, the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a division of one logic function, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for correcting color cast in a display, comprising:

generating at least one reference metrology data set and a plurality of metrology data sets to be corrected, wherein each of the reference metrology data sets comprises at least one reference current amplitude value and each of the metrology data sets to be corrected comprises at least one current amplitude value to be corrected;

controlling a target display device to display at least one reference image group based on the at least one reference metrology data group;

controlling target acquisition equipment to acquire image data of the at least one reference image group to obtain at least one reference brightness and chrominance data group;

controlling the target display device to display a plurality of groups of images to be corrected based on the plurality of measured data groups to be corrected;

controlling the target acquisition equipment to acquire image data of the plurality of image groups to be corrected to obtain a plurality of brightness and chrominance data groups to be corrected;

generating a plurality of complementary color coefficient sets based on the at least one reference brightness and chrominance data set and the plurality of brightness and chrominance data sets to be corrected, wherein the plurality of complementary color coefficient sets respectively correspond to the current amplitude values to be corrected contained in the plurality of measurement data sets to be corrected respectively.

2. The display color cast correction method of claim 1, further comprising:

acquiring a pulse width modulation value set, a reference current amplitude value and a current amplitude value set to be corrected;

wherein the generating of the at least one reference metrology data set and the plurality of metrology data sets to be corrected comprises:

generating the at least one reference metrology data set according to the pwm value set and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the pwm value set and the current amplitude value set to be corrected, such that each of the reference metrology data sets includes the reference current amplitude value and one pwm value in the pwm value set, and each of the metrology data sets to be corrected includes one pwm value in the current amplitude value set to be corrected and one pwm value in the pwm value set.

3. The method according to claim 2, wherein the set of pwm values is a single pwm value, and the set of current amplitudes to be corrected comprises a plurality of current amplitudes to be corrected; the generating the at least one reference metrology data set according to the set of pulse width modulation values and the reference current amplitude value, and generating the plurality of metrology data sets to be corrected according to the set of pulse width modulation values and the set of current amplitude values to be corrected, includes:

combining said single pulse width modulation value with said reference current amplitude value to generate one of said reference metrology data sets;

and combining the single pulse width modulation value and the plurality of current amplitudes to be corrected one by one to generate the plurality of measurement data sets to be corrected.

4. The method of display color cast correction according to claim 2, wherein the set of pulse width modulation values comprises a plurality of pulse width modulation values, and the set of current amplitude values to be corrected comprises a plurality of current amplitude values to be corrected; the generating the at least one reference measured data set according to the set of pulse width modulation values and the reference current amplitude value, and generating the multiple measured data sets to be corrected according to the set of pulse width modulation values and the set of current amplitude values to be corrected includes:

combining the pulse width modulation values with the reference current amplitude value one by one to generate a plurality of reference measurement data sets equal to the pulse width modulation values;

and combining the pulse width modulation values with the current amplitudes to be corrected in a one-to-one manner to generate a plurality of measurement data sets to be corrected, wherein the number of the measurement data sets to be corrected is equal to that of the pulse width modulation values, and the pulse width modulation values contained in the measurement data sets to be corrected are different from each other.

5. The method for correcting color cast according to claim 3 or 4, wherein the set of current amplitudes to be corrected consists of 2 ⁿ And the current amplitude to be corrected is formed, wherein n is the current amplitude bit depth of the target display device.

6. The display color cast correction method according to claim 1, wherein each of the reference image groups includes a red image, a green image, a blue image, and a white image, each of the reference luminance-chrominance data groups includes red image luminance-chrominance data, green image luminance-chrominance data, blue image luminance-chrominance data, and white image luminance-chrominance data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, each of the luminance-chrominance data groups to be corrected includes red image luminance-chrominance data, green image luminance-chrominance data, blue image luminance-chrominance data, and white image luminance-chrominance data;

the generating a plurality of complementary color coefficient sets based on the at least one reference luminance and chrominance data set and the plurality of luminance and chrominance data sets to be corrected comprises:

obtaining a correction target value based on the white image brightness data in a target reference brightness data set, taking the red image brightness data, the green image brightness data and the blue image brightness data in a target brightness data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness data set is one of the at least one reference brightness data set, the target brightness data set to be corrected is one of the multiple brightness data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness data set, contain the same pulse width modulation value;

or,

obtaining a correction target value based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target reference brightness and chrominance data set, taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness and chrominance data set is one of the at least one reference brightness and chrominance data set, the target brightness and chrominance data set to be corrected is one of the multiple brightness and chrominance data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness and chrominance data set, contain the same pulse width modulation value.

7. The display color cast correction method according to claim 1, wherein the at least one reference image group is a reference image group and includes a red image, a green image, a blue image, and a white image, the at least one reference brightness data group is a reference brightness data group and includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, and each of the brightness data groups to be corrected includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data;

taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, obtaining correction target values based on the white image brightness and chrominance data in the reference brightness and chrominance data set, the current amplitude to be corrected, the reference current amplitude and the gamma value corresponding to the target brightness and chrominance data set to be corrected, and carrying out matrix operation on the correction target values and the correction initial values to obtain corresponding complementary color coefficient sets, wherein the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected;

or,

and taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, obtaining correction target values based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in the reference brightness and chrominance data set and the current amplitude to be corrected, the reference current amplitude and the gamma value corresponding to the target brightness and chrominance data set to be corrected, and carrying out matrix operation on the correction target values and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target brightness and chrominance data set to be corrected is one of the plurality of brightness and chrominance data sets to be corrected.

8. The display color cast correction method of claim 1, further comprising:

and outputting the mapping relation of the current amplitude to be corrected contained in each of the plurality of complementary color coefficient sets and the plurality of measured data sets to be corrected to the target display device for storage.

9. A display color cast correction apparatus, comprising: the device comprises a data generation module, a display control module, an acquisition control module and a coefficient generation module;

the data generating module is used for generating at least one reference measurement data set and a plurality of measurement data sets to be corrected, wherein each reference measurement data set at least comprises a reference current amplitude value, and each measurement data set to be corrected at least comprises a current amplitude value to be corrected;

the display control module is used for controlling a target display device to display at least one reference image group based on the at least one reference measured data group and controlling the target display device to display a plurality of image groups to be corrected based on the plurality of measured data groups to be corrected;

the acquisition control module is used for controlling the target acquisition equipment to acquire image data of the at least one reference image group to obtain at least one reference brightness and chrominance data group and controlling the target acquisition equipment to acquire image data of the plurality of image groups to be corrected to obtain a plurality of brightness and chrominance data groups to be corrected;

the coefficient generation module is used for generating a plurality of complementary color coefficient sets based on the at least one reference brightness and chrominance data set and the plurality of brightness and chrominance data sets to be corrected, wherein the plurality of complementary color coefficient sets respectively correspond to the current amplitude values to be corrected contained in the plurality of measurement data sets to be corrected.

10. The display color cast correction apparatus of claim 9, further comprising:

the acquisition module is used for acquiring a pulse width modulation value set, a reference current amplitude value and a current amplitude value set to be corrected;

the data generation module is specifically configured to:

11. The display color shift correction device according to claim 9, wherein each of the reference image groups includes a red image, a green image, a blue image, and a white image, each of the reference luminance-chrominance data groups includes red image luminance-chrominance data, green image luminance-chrominance data, blue image luminance-chrominance data, and white image luminance-chrominance data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, each of the luminance-chrominance data groups to be corrected includes red image luminance-chrominance data, green image luminance-chrominance data, blue image luminance-chrominance data, and white image luminance-chrominance data;

the coefficient generation module is specifically configured to:

obtaining a correction target value based on the white image brightness and chroma data in a target reference brightness and chroma data set, taking the red image brightness and chroma data, the green image brightness and chroma data and the blue image brightness and chroma data in a target brightness and chroma data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness and chroma data set is one of the at least one reference brightness and chroma data set, the target brightness and chroma data set to be corrected is one of the multiple brightness and chroma data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected, which respectively correspond to the target reference brightness and chroma data set, contain the same pulse width modulation value;

or,

obtaining a correction target value based on the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target reference brightness and chrominance data set, taking the red image brightness and chrominance data, the green image brightness and chrominance data and the blue image brightness and chrominance data in a target brightness and chrominance data set to be corrected as correction initial values, and performing matrix operation on the correction target value and the correction initial values to obtain a corresponding complementary color coefficient set, wherein the target reference brightness and chrominance data set is one of the at least one reference brightness and chrominance data set, the target brightness and chrominance data set to be corrected is one of the multiple brightness and chrominance data sets to be corrected, and the reference measurement data set and the measurement data set to be corrected respectively corresponding to the target reference brightness and chrominance data set contain the same pulse width modulation value.

12. The display color shift correction device according to claim 9, wherein the at least one reference image group is a reference image group and includes a red image, a green image, a blue image, and a white image, the at least one reference brightness data group is a reference brightness data group and includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data, each of the image groups to be corrected includes a red image, a green image, a blue image, and a white image, and each of the brightness data groups to be corrected includes red image brightness data, green image brightness data, blue image brightness data, and white image brightness data;

the coefficient generation module is specifically configured to:

or,

13. The display color cast correction apparatus of claim 9, further comprising:

and the output module is used for outputting the mapping relation of the current amplitude to be corrected contained in each of the plurality of complementary color coefficient sets and the plurality of measurement data sets to be corrected to the target display device for storage.

14. A display color cast correction system, comprising:

a correction computer for performing the display color cast correction method according to any one of claims 1 to 8;

the display controller is in signal connection with the correction computer to the target display device; and

and the acquisition equipment is in signal connection with the correction computer and serves as the target acquisition equipment.