TWI676164B - Color tuning system, method and display driver - Google Patents

Abstract

The chroma adjustment system includes a memory and a processor. The processor executes the following procedures according to one or more instructions in the memory: selecting a plurality of chrominance nodes in the color gamut; and calculating a plurality of corresponding grayscale values corresponding to each of the chrominance nodes respectively. Correction scale values, which are used to adjust the grayscale output characteristics of each of the grayscale values relative to a frontal viewing angle at one side viewing angle; construct a color gamut lookup table to record these The correction ratio values corresponding to the chroma nodes; based on each of the grayscale values, smoothing the correction ratio values to update a lookup table, the lookup table is used to provide the correction ratio values to a display panel driver To drive a display panel.

Description

Chroma adjustment system, method and display panel driver

This case relates to a chromaticity adjusting system, a chromaticity adjusting method, and a display panel driver, and more particularly to a chromaticity adjusting system, a chromaticity adjusting method, and a display panel driver that adjust the three-color grayscale values of each chromaticity.

In today's living environment, the display is a widely used device. For example, the display is indispensable on electronic signage, television screens, computer screens and other devices. With the increase in demand, the quality of the display, such as resolution and dynamic performance, is also valued. However, despite the continuous improvement of the quality of the display, under a large side viewing angle, the colors viewed by the user on the display are likely to have color shift (or whitewashing), which results in a poor user experience. .

In order to solve the above problems, an implementation aspect of the present invention relates to a chromaticity adjustment system. The chromaticity adjustment system includes a memory and a processor. The memory is used to store one or more instructions. The processor is coupled to the memory and executes the following procedure according to the one or more instructions: Counting the chromaticity nodes; calculating a plurality of correction scale values corresponding to the plurality of gray scale values of each of the chromaticity nodes, wherein the correction scale values are respectively used to adjust each of the gray scale values One is a grayscale output characteristic relative to a frontal angle at one viewing angle; constructing a lookup table of the color gamut to record the correction ratio values corresponding to the chromaticity nodes; and based on the grayscales Each of the values smoothes the correction ratio values to update the lookup table, wherein the lookup table is used to provide the correction ratio values to a display panel driver to drive a display panel.

Another aspect of the present invention relates to a method for adjusting chromaticity. The chromaticity adjustment method includes the following steps: selecting a plurality of chromaticity nodes in a color gamut; calculating a plurality of correction ratio values corresponding to a plurality of grayscale values of each of the chromaticity nodes, wherein the corrections The scale values are used to adjust the grayscale output characteristics of each of the grayscale values relative to a frontal viewing angle at one viewing angle; constructing a lookup table of the color gamut, wherein the lookup table is used to find the The correction ratio values corresponding to the chroma nodes; and smoothing the correction ratio values based on each of the grayscale values to update the lookup table.

Another aspect of the present invention relates to a display panel driver. The display panel driver includes a memory and a driving circuit. The memory is used for storing a look-up table. The driving circuit is coupled to the memory. The driving circuit is used for driving a display panel according to the look-up table and a plurality of image signals corresponding to a plurality of chromaticities. The lookup table is constructed by a chromaticity adjustment method.

In some embodiments, the chromaticity adjustment method includes the following steps: selecting a plurality of chromaticity nodes in a color gamut; and calculating a plurality of correction ratio values corresponding to a plurality of grayscale values of each of the chromaticities respectively. Of which these repairs The positive proportional values are respectively used to adjust the grayscale output characteristics of each of the grayscale values relative to a frontal viewing angle under one viewing angle; constructing the lookup table of the color gamut, wherein the lookup table is used to find the The correction ratio values corresponding to the chroma nodes; and smoothing the correction ratio values based on each of the grayscale values to update the lookup table.

In some embodiments, the chromaticity adjustment method further includes the following steps: calculating at least a plurality of specified correction ratio values of a specified chromaticity; and adjusting the correction ratio values corresponding to a chroma set according to the specified correction ratio values to The query table is updated, wherein the chromaticity nodes included in the chromaticity set are adjacent to the at least one specified chromaticity in the query table.

In some embodiments, in the chrominance adjusting method, the correction ratio values corresponding to at least one of the grayscale values are smaller than a threshold value.

In some embodiments, smoothing the correction ratio values in the chroma adjustment method includes the following steps: smoothing the correction ratio values according to a median filtering algorithm and a moving average algorithm.

In some embodiments, in the chrominance adjustment method, the grayscale output characteristic is a main-subpixel pixel separation gamma ratio of each of the grayscale values.

Therefore, according to the technical content of the embodiments of the present invention, the embodiments of the present invention provide a chromaticity adjustment system and a chromaticity adjustment method, so as to improve the problem of color misregistration of the side viewing angle on the display.

100‧‧‧Chroma adjustment system

110‧‧‧Memory

120‧‧‧ processor

200‧‧‧Display Panel Driver

210‧‧‧Memory

220‧‧‧Drive circuit

300‧‧‧ display panel

400‧‧‧Drive circuit manufacturing equipment

S210 ~ S260‧‧‧step flow

C1 ~ C8‧‧‧ Chroma Node

UK‧‧‧ Designated Node

To enable the above and other purposes, features, advantages and implementation of this case The examples can be more clearly understood. The description of the drawings is as follows: Figure 1 is a schematic diagram of a chromaticity adjustment system based on an embodiment of the present case; Figure 2 is a chromaticity diagram based on an embodiment of the present case The flowchart of the steps of the adjustment method; Figure 3 is a schematic diagram of a three-dimensional coordinate system based on an embodiment of the case; Figure 4 is a schematic diagram of a three-dimensional coordinate system based on an embodiment of the case; and Figure 5 is based on A schematic diagram of a three-dimensional coordinate system shown in an embodiment of the present case; FIG. 6A is a schematic diagram of a chromaticity adjustment system based on an embodiment of the present case; and FIG. 6B is a display panel based on an embodiment of the present case. Schematic diagram of the drive.

The following will clearly illustrate the spirit of this case with diagrams and detailed descriptions. Any person with ordinary knowledge in the technical field who understands the embodiments of this case can be changed and modified by the techniques taught in this case without departing from the scope of this case. Spirit and scope.

The terminology used herein is for describing particular embodiments only and is not intended as a limitation of the present case. Singular forms such as "a", "the", "the", "the" and "the", as used herein, also include the plural.

As used herein, "coupled" or "connected" can refer to two or more components or devices directly making physical contact with each other, or indirectly making physical contact with each other, or two or more components or devices to each other. Operation or action.

The terms "including", "including", "having", "containing" and the like used in this article are all open-ended terms, which means including but not limited to.

As used herein, "and / or" includes any and all combinations of the things described.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted to have meanings consistent with their meanings in the context of the related art and the present invention, and will not be interpreted as idealized or excessive Formal meaning unless explicitly defined as such in this article.

Exemplary embodiments are described herein with reference to cross-sectional views that are schematic views of idealized embodiments. Accordingly, variations in the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Therefore, the embodiments described herein should not be construed as limited to the particular shape of the area as shown herein, but include shape deviations caused by, for example, manufacturing. For example, a region shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, the acute angles shown may be round. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

FIG. 1 is a chromaticity adjustment system based on an embodiment of the present invention. Schematic of the system. As shown in FIG. 1, in an embodiment, a chromaticity adjustment system 100 includes a memory 110 and a processor 120, wherein the memory 110 is electrically coupled to the processor 120. In this embodiment, the processor 120 may include but is not limited to the integration of a single processing unit or a plurality of microprocessors. The single processing unit or the integration is electrically coupled to the memory 110. The memory 110 may be a volatile or non-volatile internal or external memory. The processor 120 is configured to access at least one instruction from the memory 110 and execute the at least one instruction to further implement a program defined by the at least one instruction. In order to better understand the operation of the processor 120, the program defined by the at least one instruction will be described in the following paragraphs.

As shown in FIG. 1, in this embodiment, the processor 120 of the chromaticity adjustment system 100 is further communicatively coupled to a display panel driver 200, and the display panel driver 200 is electrically coupled to a display panel 300. . It should be noted that the communication coupling referred to herein may be a physical coupling or a non-physical coupling. For example, the processor 120 and the display panel driver 200 can be connected to each other through wireless communication technology (Wi-Fi), so that the processor 120 and the display panel driver 200 can exchange information. Alternatively, the processor 120 and the display panel driver 200 may be connected to each other through a physical line, whereby the processor 120 and the display panel driver 200 may exchange information.

In this embodiment, the display panel 300 may be a liquid crystal display disposed on an electronic display device, particularly a vertical alignment liquid crystal display. The display panel driver 200 is used to provide a specific voltage to the pixel electrode array in the display panel 300, so that each pixel unit in the display panel 300 is rendered. Chroma is now scheduled.

As shown in FIG. 1, in this embodiment, the processor 120 of the chroma adjustment system 100 is used to access and execute the at least one instruction from the memory 110 to implement the defined by the at least one instruction. The program. The program can regulate the display panel driver 200 to provide different voltage signals to adjust the ratio of the main and auxiliary pixels in the pixel electrode array, thereby changing the chromaticity presented by each pixel unit of the display panel 300. In short, the processor 120 can control the display panel 300 so that the display panel 300 displays a chromaticity different from a predetermined chromaticity. By the above method, the color washout problem of the display panel 300 when viewed from the side can be reduced.

FIG. 2 is a schematic diagram of a chromaticity adjustment method according to an embodiment of the present invention. As shown in the embodiment of FIG. 1, the processor 120 is configured to access and execute the at least one instruction from the memory 110 to implement the program defined by the at least one instruction. As shown in Figure 2, the program is a chroma adjustment method. The chroma adjustment method has several steps, and the details of each step will be described in the following paragraphs.

Step S210: Select a plurality of chromaticity nodes in a color gamut.

According to the foregoing description, in the embodiment shown in FIG. 1, the display panel 300 has a plurality of pixel units. A pixel electrode array is disposed in the pixel units, and the display panel driver 200 can provide a voltage to the images. The pixel electrode array, so that each pixel unit of the display panel 300 presents a predetermined color. However, it should be understood that when the human eye views the display panel at different angles, the perceived chromaticity is different. Generally speaking, under one viewing angle, the human eye may notice that the display panel produces a color shift phenomenon relative to a front viewing angle. This phenomenon will cause The user cannot normally experience the desired color of the display panel. In some embodiments, the front view angle refers to a chromaticity that a color appears at a front view angle of zero degrees (0 °) of the display panel 300. In some embodiments, the side view angle refers to a chromaticity of the color displayed at a forty-five degree (45 °) side view angle of the display panel 300.

According to the foregoing, in order to solve this problem, the gamma ratio of the main and auxiliary pixel separation degrees of each chromaticity can be adjusted by algorithms to reduce the color difference between the side view angle and the front view angle of the display panel to reduce human The color shift phenomenon felt from the side-view angle. In some embodiments of the present case, the processor 120 executes an algorithm to calculate the primary and auxiliary pixel separation gamma ratios for each chromaticity. In this way, the processor 120 may generate a new substitute gray level according to the substitute gray level and the input gray level calculation. The processor 120 can change the voltages of the pixel electrode arrays provided by the display panel driver 200 to the display panel 300, so that the pixel units on the display panel 300 can present colors according to the new alternative grayscale, respectively. This reduces the color shift phenomenon that may occur in the display panel 300 at a side viewing angle.

In some embodiments, the "primary and secondary pixel resolution gamma ratio" in this article is relative to the gamma of the primary pixel relative to an initial coupling ratio. The ratio between the resolution of one of the initial coupling ratios. In some embodiments, the initial coupling ratio is 1, but this case is not limited to this.

In some embodiments, the processor 120 executes the at least one instruction in the memory 110 to select a complex chromaticity from a color gamut. In order to reduce the amount of system operations, the processor 120 may select (or calibrate) the three Coordinate points in the dimensional coordinate system. For a better understanding, please refer to FIG. 3 together, which is a schematic diagram of a three-dimensional coordinate system based on an embodiment of the present invention. It should be noted that the three-dimensional coordinates in FIG. 3 are used to represent the chromaticity nodes in the color gamut. The three axes of the color gamut diagram correspond to the grayscale values of the three primary colors, which are the red (Red) axis and green ( Green axis and Blue axis. The three grayscale values corresponding to one origin of the three-dimensional coordinate system are (0,0,0), the first grayscale value corresponds to the red axis, the second grayscale value corresponds to the green axis, and the third grayscale value corresponds to To the blue axis. According to the three grayscale values, the red grayscale value, green grayscale value, and blue grayscale value corresponding to the origin point are all 0, and the origin point corresponds to black in the color gamut. By analogy, each coordinate point (corner point of each square in the figure) in the three-dimensional coordinate system has a grayscale value corresponding to three axes, and each coordinate point corresponds to a chromaticity in the color gamut, which is called Chroma node. Any node in the three-dimensional coordinate system in FIG. 3 is a chroma node. It should be understood that the three-dimensional coordinate system has a total of 16581375 (255 * 255 * 255) chroma nodes. However, for ease of understanding, the three-dimensional coordinate system in FIG. 3 only shows a part of the chromaticity nodes to avoid being too complicated visually.

According to the foregoing description, the processor 120 may select (or calibrate) each coordinate point in the three-dimensional coordinate system according to the specific distance. For example, as shown in FIG. 3, in some embodiments, the processor 120 may select (or calibrate) each coordinate point in the three-dimensional coordinate system according to a grayscale value of 17 intervals. In this way, in the three-dimensional coordinate system of the color gamut, the nodes corresponding to the grayscale values (17X, 17Y, 17Z) will be calibrated, where the range of X, Y, and Z values is 0-15. Thereby, the processor 120 can select (or calibrate) 3375 (ie, 16581375/17 ³ ) chromaticity nodes in the color gamut, and the chromaticity nodes respectively correspond to a chromaticity in the color gamut. It should be understood that, in this embodiment, the processor 120 selects or calibrates the chroma nodes with a pitch of 17, which is only for illustration and not a limitation. In other embodiments, according to the needs of the user or the system, The processor 120 may select or calibrate chrominance nodes using other values as the distance.

Step S220: Calculate a plurality of correction scale values corresponding to the plurality of gray scale values of each of the chromaticity nodes, wherein the correction scale values are respectively used to adjust each of the gray scale values. Gray-scale output characteristics relative to a front viewing angle at one viewing angle.

In some embodiments, as shown in FIG. 3, after the processor 120 selects (or calibrates) some chromaticity nodes in the three-dimensional coordinate system, the processor 120 may calculate the complex numbers corresponding to the chromaticity nodes respectively. Correction ratio values. According to the foregoing description, by adjusting the gamma ratio of the main and auxiliary pixel separation degrees of each chromaticity, the color difference of the display panel 300 between the side viewing angle and the front viewing angle can be reduced. However, in practical applications, if all the pixel units on the display panel are adjusted based on only a single gamma ratio, it may cause a mesh phenomenon recognizable by the human eye, thereby reducing the user's visual experience. Therefore, in order to avoid the above problems, in some embodiments, the processor 120 is configured to separately calculate a correction ratio value of each chroma node. In some embodiments, the correction ratio is the primary and auxiliary pixel separation gamma ratios of the three-color grayscale values of each chromaticity node.

In some embodiments, the processor 120 in this case calculates the primary and auxiliary pixel separation gamma ratios of the three-color grayscale values of each chromaticity node based on a minimum color difference algorithm. The minimum chromatic aberration algorithm mainly uses the principle of color mixing, and uses the three-color grayscale value of the color corresponding to each chromaticity node at the front view angle as the color mixing target. Color grayscale value ratio. Then, based on a formula, search for the best solution with the smallest color difference between the color corresponding to each chromaticity node under the front view angle and the side view angle. The optimal solution is the best main and auxiliary pixel separation of the color corresponding to each chroma node. Gamma ratio. In some embodiments, the formula is modified from the CIEDE2000 formula used by the International Illumination Commission, as shown below.

△ E = SQRT ((△ C '/ S _c ) ² + (△ H / S _H ) ² + R _T (△ C' / S _c ) (△ H / S _H ))

The above formula can be calculated for each grayscale value of each chroma node. In the above formula, ΔE is a color difference value. In the above formula, △ H is the hue difference, and the value of the hue difference is H _Oblique -H _Direct , that is, the hue value of the side view angle minus the hue value of the front view angle. In the above formula, to calculate △ C ', we need to calculate △ C first. Among them, ΔC is the chroma difference, and the value of the chroma difference is C _Oblique -C _Direct . In the above formula, △ C '= △ C * W, where W is a weight value used to adjust △ C and △ H in the optimal solution. In the above formula, if the weight value W <1, it represents that the optimal solution deflection hue is small, and if the weight value W> 1, it represents that the optimal solution deflection chroma is small. In the above formula, S _c is a chroma compensation value, S _H is a hue compensation value, and R _T is a hue rotation value. It should be noted that the above improved formula can be understood by referring to the original CIEDE2000 formula. In some embodiments, the value of the weight value W is between 0.8 and 1 (80% and 120%).

In some embodiments, when the processor 120 executes the minimum color difference algorithm to search for the best solution of the color corresponding to each chromaticity node with the minimum color difference at the front view angle and the side view angle, the processor 120 may perform Spatial Domain boundary conditions to limit the tri-color gray of each chroma node The degree of separability of the order value. The boundary condition of the spatial domain can be understood as a threshold, and the value is between 0% and 100%. For example, if the threshold of the boundary condition of the spatial domain is set to a red grayscale value equal to 1 (corresponding to 100%), a green grayscale value equal to 0.5 (corresponding to 50%), and a blue grayscale value equal to 1 (corresponding to 100%). . When the processor 120 searches for the best solution for a certain chroma node, the search range of the green grayscale value will be limited to 0.5 ~ 1 due to the threshold. Thereby, not only the calculation amount of the processor 120 can be reduced, but also the rhombus phenomenon during the display of the display panel 300 can be reduced.

As mentioned above, in some embodiments, when the processor 120 selects (or calibrates) the chromaticity nodes in the three-dimensional coordinate system, the processor 120 may calculate the colors one by one according to the minimum color difference algorithm. The correction ratio values corresponding to the degree nodes respectively. It should be noted that when a signal corresponding to a color of a chromaticity node is input to the display panel driver 200, the display panel driver 200 may adjust the signal according to the correction ratio value of the chromaticity node to make the display panel 300 Each pixel of the pixel controls the separation degree of the main, sub-pixels of the three colors of red, green, and blue with the correction ratio of the chromaticity node. In this situation, when the user observes the color of the display panel 300 at a side view angle, the user will be close to the color of the front view angle.

Step S230: Construct a lookup table of the color gamut, wherein the lookup table is used to find the correction ratio values corresponding to the chromaticity nodes.

As mentioned above, in some embodiments, when the processor 120 selects (or calibrates) the 3375 chromaticity nodes in the three-dimensional coordinate system, the processor 120 may calculate the chromaticities one by one according to the above algorithm. The correction ratio values corresponding to the nodes, and associate the correction ratio values with the chroma sections Point to construct a lookup table for the color gamut. For example, for a first node whose grayscale value is (17,0,0), the processor 120 may search the red grayscale value, green grayscale value, and blue of the first node respectively according to the algorithm. One of the best solutions for the gamma ratio of the primary and sub-pixel separation ratios of the grayscale values, the processor 120 records in a lookup table the optimal solution as a modified ratio value corresponding to the first node. For example, for a second node whose grayscale value is (34,0,0), the processor 120 may search the red grayscale value, green grayscale value, and blue of the second node respectively according to the algorithm. One of the best solutions of the primary and auxiliary pixel separation gamma ratios of the grayscale values, the processor 120 records in the lookup table the optimal solution as a modified ratio value corresponding to the second node. By analogy, the processor 120 can completely calculate the correction ratio values corresponding to the 3375 chroma nodes, and record the correction ratio values in the lookup table, so that the correction ratio values are respectively associated with the 3375. Chroma nodes. In some embodiments, the processor 120 stores the constructed look-up table in the memory 110.

Step S240: smooth the correction ratio values based on each of the grayscale values to update the lookup table.

As mentioned above, in some embodiments, when the processor 120 obtains the correction ratio values corresponding to the 3375 chroma nodes and records them in the lookup table of the color gamut, the processor 120 may perform The algorithm smoothes these correction ratio values. In some embodiments, the smoothing algorithm includes at least a median filtering algorithm and a moving average algorithm. Following the foregoing embodiment, the processor 120 may access the lookup table and select a number of chromaticity nodes adjacent to the three-dimensional coordinate system from the 3375 chromaticity nodes, and further perform the selection on the selected chromaticity nodes. Smoothing.

For a better understanding, please refer to FIG. 4 together, which is a schematic diagram of a three-dimensional coordinate system based on an embodiment of the present invention. For example, as shown in FIG. 4, the processor 120 may select five adjacent chroma nodes in the three-dimensional coordinate system, that is, a list of adjacent chroma nodes that are framed and marked in the figure. The processor 120 then uses the median filtering algorithm to smooth the main and auxiliary pixel separation gamma ratios of the red, green, and blue grayscale values of the five chroma nodes respectively. . For example, if the primary and auxiliary pixel separation gamma ratios of the red grayscale values of the five chroma nodes are selected as follows: 0.40, 0.42, 0.58, 0.43, 0.40, the processor 120 may first use the median value. The filtering algorithm sorts the primary and auxiliary pixel separation gamma ratios of the red grayscale values of the five chromaticity nodes, and selects the median. In this embodiment, after sorting, the processor 120 may obtain the median of the gamma ratio of the main and auxiliary pixel separation degrees to be 0.42. According to the median filtering algorithm, the processor 120 may replace the median with the largest of the gamma ratios of the primary and auxiliary pixel separation degrees of the five chrominance nodes. Therefore, after processing by the median filtering algorithm, the primary and auxiliary pixel separation gamma ratios of the red grayscale values of the five chromaticity nodes selected are 0.40, 0.42, 0.42, 0.43, and 0.40, respectively. So far, it should be understood that the median filtering algorithm is used to exclude singular points (outliers) among neighboring chroma nodes.

According to the foregoing description, after processing by the median filtering algorithm, the processor 120 may smooth the primary and auxiliary pixel separation gamma ratios of the red grayscale values of the five chroma nodes according to the moving average algorithm. In this embodiment, the processor 120 may execute the moving average algorithm according to a Filter Window. For example, if the value of the filter window is three, the processor 120 may sequentially select three chroma nodes among the five chroma nodes, and select the three chroma nodes. The gray ratio of the main pixel and sub pixel separation of the red grayscale value is smoothed. Following the previous embodiment, after processing by the median filtering algorithm, the primary and auxiliary pixel separation gamma ratios of the red grayscale values of the five chromaticity nodes selected are: 0.40, 0.42, 0.42, 0.43, 0.40. According to the moving average algorithm, the processor 120 may first calculate the average value of the first to third chroma nodes, and the calculation result is 0.413. The processor 120 will use the calculation result to replace the second chroma node. The main and auxiliary pixel resolution gamma ratio. According to the filter window, the processor 120 may calculate the average value of the second to fourth chroma nodes, that is, to calculate the average value of 0.413, 0.42, and 0.43. The calculation result is 0.421, and the processor 120 will use the The calculation results replace the primary and secondary pixel separation gamma ratios of the third chroma node. According to the filter window, the processor 120 finally calculates the average value of the third to fifth chroma nodes, that is, to calculate the average value of 0.421, 0.43, and 0.40. The calculation result is 0.417. The processor 120 will use the The calculation results replace the primary and secondary pixel separation gamma ratios of the fourth chroma node. Therefore, after processing by the moving average algorithm, the main and auxiliary pixel separation gamma ratios of the red grayscale values of the five chromaticity nodes selected in Figure 4 are: 0.40, 0.413, 0.421, 0.417, 0.40.

It should be noted that the foregoing embodiments are merely examples, and the present invention is not limited thereto. In different embodiments, when the processor 120 executes the median filter algorithm and the moving average algorithm, the number of chroma nodes selected by the processor 120 and the size of the filter window may be determined by system or user requirements. Adjusted.

In the foregoing embodiment, only the calculation of the primary and auxiliary pixel separation gamma ratios of the red grayscale values of the five chromaticity nodes selected in FIG. 4 is taken as For example, for all the chroma nodes in the three-dimensional coordinate system shown in FIG. 3, the processor 120 can use the median filtering algorithm and the moving average algorithm for the red grayscale values and green of the chroma nodes. The gray-scale values and the gray-scale values of the main and auxiliary pixel separation gamma ratios are smoothed. It should be understood that after the smoothing algorithm is processed, the discontinuity of the correction ratio values of the adjacent chromaticity nodes in the three-dimensional coordinate system shown in FIG. 3 can be reduced. Therefore, in the lookup table, the correction ratio value corresponding to each chromaticity node will have better smoothness.

Step S250: Calculate a plurality of specified correction ratio values of at least one specified chromaticity, and adjust the correction ratio values corresponding to a chroma set according to the specified correction ratio values to update the lookup table, where the chroma set contains the The chromaticities are adjacent to the at least one specified chromaticity in the lookup table.

In some embodiments, for at least one specified chromaticity in the color gamut, the processor 120 may further calculate a plurality of specified correction ratio values of the at least one specified chromaticity, and update the lookup table accordingly. In detail, following the foregoing embodiment, if a special chromaticity is specified in the color gamut, especially if the special chromaticity does not belong to the 3375 chromaticity nodes defined in the three-dimensional coordinate system, the processor 120 may A chromaticity node corresponding to the special chromaticity is defined in the three-dimensional coordinate system, so that the lookup table includes a correction ratio value of the special chromaticity.

For a better understanding, please refer to FIG. 5 together, which is a schematic diagram of a three-dimensional coordinate system based on an embodiment of the present invention. The grid shown in FIG. 5 corresponds to a grid in the three-dimensional coordinate system in FIG. 4, and each corner point of the grid is a defined chromaticity node. For example, as shown in FIG. 5, a certain chromaticity is specified in the color gamut. The specified chromaticity corresponds to a specified node UK in the three-dimensional coordinate system, and the specified node UK is not a modified scale value. Defined One of 3375 chroma nodes. Similar to the foregoing embodiment, the processor 120 may search for one of the main and auxiliary pixel separation gamma ratios of the red gray level, the green gray level, and the blue gray level of the specified node UK according to the minimum color difference algorithm For the best solution, the processor 120 may select a number of defined chromaticity nodes in the three-dimensional coordinate system closest to the designated node UK, and the defined chromaticity nodes may be understood as a chromaticity set. As shown in Figure 5, the complex chromaticity nodes C1 ~ C8 are adjacent to the designated node UK. The chromaticity nodes C1 ~ C8 are defined nodes in the three-dimensional coordinate system, and their correction ratio values are recorded in the query. In the table. As shown in FIG. 5, since the designated node UK corresponds to the designated chromaticity, the processor 120 may select the four defined nodes closest to the designated node UK among the chromaticity nodes C1 to C8, which are respectively colored. Degree nodes C3, C6, C7, and C8, the processor 120 may replace the corrected ratio values of the four defined nodes with the best solution of the designated node UK.

Thus, in some embodiments, if the color gamut includes a plurality of specified chromaticities, the processor 120 may calibrate the plurality of chromaticity nodes corresponding to the specified chromaticities in the three-dimensional coordinate system, and according to the minimum color difference algorithm Search for the best solution of the primary and auxiliary pixel separation gamma ratios corresponding to the red, gray, and blue gray values of these chromaticity nodes. After the best solution corresponding to the specified chroma is calculated, the processor 120 updates the correction ratio values of the defined chroma nodes adjacent to the chroma nodes in the lookup table.

Step S260: Calculate the correction ratio values of other chroma nodes in the color gamut to complete the lookup table. The lookup table is used to find the correction ratio values corresponding to all chroma nodes.

As mentioned earlier, in this embodiment, the processor 120 may be The query table records the correction ratio values corresponding to the 3375 chroma nodes, and the 3375 chroma nodes are defined chroma nodes. In some embodiments, the processor 120 may calculate the correction ratio value of the undefined chromaticity node in the color domain according to an interpolation algorithm. It should be noted that, in some embodiments, the interpolation algorithm may be a Tetrahedral Interpolation algorithm. The tetrahedral interpolation algorithm can complete the modified ratio value of the undefined chromaticity node according to the modified ratio value of the chromaticity node defined in the three-dimensional coordinate system. For example, the grayscale value of a fourth node is (25,1,1), and the fourth node is not one of the 3375 defined chrominance nodes. According to the interpolation algorithm, the processor 120 may calculate the defined chrominance nodes that are close to the fourth node, and select the four nodes with the shortest distance from the fourth node. On the three-dimensional coordinate system corresponding to the color gamut, the fourth node falls in a tetrahedron formed by the four nodes. According to the interpolation algorithm, the processor 120 may use the ratio of the distance between the four nodes and the fourth node as a weight, and multiply each weight by the correction ratio of the four nodes to obtain the Modified scale value of the fourth node.

According to the foregoing description, in step S250, when certain chroma nodes are designated chroma, the processor 120 may use the correction ratio values of the defined nodes adjacent to the chroma nodes to specify the best solution for chroma. To replace. Therefore, according to the interpolation algorithm, the correction ratio values of the chromaticity nodes falling around the specified chromaticity should be equal to the correction ratio of the specified chromaticity.

In this embodiment, the processor 120 may separately calculate the correction ratio value of each chroma node according to the interpolation algorithm, whereby the processor 120 may obtain all but the 3375 chroma nodes that have been defined. Chroma Node Correspondence The correction ratio value. Thereby, the processor 120 can complete the lookup table. The lookup table is associated with 16581375 (255 * 255 * 255) chromaticity nodes, each chromaticity node corresponds to one chromaticity in the color gamut, and each chromaticity node is associated with three correction scale values, each chromaticity The correction ratio values of the nodes correspond to the primary and auxiliary pixel separation gamma ratios of the red, gray, and blue gray values of the chromaticity node, respectively.

It should be noted that, in some embodiments, the processor 120 may provide the lookup table to the display panel driver 200. When a signal corresponding to a color of a chromaticity node in the gamut is input to the display panel driver 200, the display panel driver 200 can obtain the chromaticity node's The grayscale is newly replaced, and the grayscale modulation signal is replaced with the new grayscale, so that the pixels in the display panel 300 control the main, sub-pixels of red, green, and blue with the new grayscale. Thereby, the color shift phenomenon observed by the user at a side viewing angle of the display panel 300 can be reduced.

FIG. 6A is a schematic diagram of a chromaticity adjustment system according to an embodiment of the present invention. As shown in FIG. 6A, in an embodiment, the chroma adjustment system 100 includes the memory 110 and the processor 120, similar to the embodiment in FIG. 1. The difference is that, in this embodiment, the processor 120 of the chromaticity adjustment system 200 is further communicatively coupled to a driving circuit manufacturing device 400. The driving circuit manufacturing device 400 can be used to manufacture the display as shown in FIG. Panel driver 200. In this embodiment, the processor 120 is used to access and execute the at least one instruction from the memory 110 to further implement the program defined by the at least one instruction. This program is a chroma adjustment method. The chroma adjustment method includes the steps shown in FIG. 2. Please refer to the embodiment in FIG. 2 together.

FIG. 6B is a schematic diagram of a display panel driver according to an embodiment of the present invention. As shown in FIG. 6B, in an embodiment, the display panel driver 200 includes a memory 210 and a driving circuit 220. It should be noted that the display panel driver 200 shown in FIG. 2 may have a similar arrangement as shown in FIG. 6B.

Please refer to FIG. 6A and FIG. 6B together. In some embodiments, when the processor 120 shown in FIG. 6A records the correction ratio values corresponding to the defined chroma nodes in the lookup table, the processor 120 may use the lookup table and the internal value. The interpolation algorithm is transmitted to the driving circuit manufacturing apparatus 400. When the driving circuit manufacturing apparatus 400 manufactures the display panel driver 200 as shown in FIG. 6B, the driving circuit manufacturing apparatus 400 may write the lookup table and the interpolation algorithm into the memory of the display panel driver. In this way, when an image signal corresponding to a chromaticity is input to the driving circuit manufacturing equipment 400, if the chromaticity does not correspond to the defined chromaticity node in the lookup table, the driving circuit manufacturing equipment 400 may execute according to the lookup table. The interpolation algorithm obtains a complex correction ratio value corresponding to the chromaticity, so that the display panel driver 200 adjusts the image signal with the correction ratio values. Accordingly, the display panel driver manufactured by the driving circuit manufacturing apparatus 400 has a function of suppressing a color shift phenomenon at a side viewing angle.

In some embodiments, the processor 120 may complete the lookup table according to the interpolation algorithm, and then transmit the lookup table to the driving circuit manufacturing equipment 400. In this way, when the driving circuit manufacturing apparatus 400 manufactures a display panel driver, the complete look-up table can be written into the memory of the display panel driver. In this way, when an image signal corresponding to a chrominance is input to the driving circuit manufacturing equipment 400, the driving circuit manufacturing equipment 400 may The query table obtains a plurality of correction ratio values corresponding to the chromaticity, so that the display panel driver 200 adjusts the image signal with the correction ratio values. Similarly, a display panel driver manufactured by the driving circuit manufacturing apparatus 400 also has a function of suppressing a color shift phenomenon at a side viewing angle.

It can be known from the foregoing embodiments that the application has the following advantages. The processor 120 in this case can calculate the primary and auxiliary pixel separation gamma ratios of the three-color grayscale values for each chromaticity node in the color domain, so that the display panel 300 applies the three-color grayscale values when displaying the various chromaticities. The main and auxiliary pixel separation gamma ratios are used to reduce the color shift phenomenon at the side view angle and the diamond pattern caused by the similar chromaticity.

Although this case is disclosed as above with examples, it is not intended to limit the case. Any person skilled in this art can make various modifications and retouches without departing from the spirit and scope of the case. Therefore, the scope of protection of this case shall be attached as The scope of the patent application shall prevail.

Claims (14)

A chromaticity adjustment system includes: a memory for storing one or more instructions; and a processor coupled to the memory, and performing the following procedure according to the one or more instructions: selecting a plurality of numbers in a color gamut Chroma nodes; calculate a plurality of correction scale values corresponding to the plurality of gray scale values of each of the chroma nodes, wherein the correction scale values are used to adjust each of the gray scale values, respectively The grayscale output characteristics relative to a frontal viewing angle at one viewing angle; constructing a lookup table of the color gamut to record the correction ratio values corresponding to the chromaticity nodes; and based on the grayscale values Each of them smoothes the correction ratio values to update the lookup table, wherein the lookup table is used to provide the correction ratio values to a display panel driver to drive a display panel. The chromaticity adjustment system according to claim 1, wherein the processor further calculates a plurality of specified correction ratio values of at least one specified chromaticity, and adjusts the correction ratio values corresponding to a chroma set according to the specified correction ratio values. To update the lookup table, the chroma nodes included in the chroma set are adjacent to the at least one specified chroma in the lookup table. The chromaticity adjusting system according to claim 1, wherein the processor is further configured to execute an interpolation algorithm on the lookup table. When the plurality of image signals used to drive the display panel do not correspond to the chromaticity nodes, The display panel driver drives the display panel according to the lookup table processed by the interpolation algorithm. The chromaticity adjustment system according to claim 1, wherein the correction ratio values corresponding to at least one of the grayscale values are smaller than a threshold value. The chromaticity adjustment system according to claim 1, wherein the processor smoothes the correction ratio values according to a median filtering algorithm and a moving average algorithm. The chromaticity adjustment system according to claim 1, wherein the correction ratio values are main and auxiliary pixel separation degree gamma ratios of each of the grayscale values. A chromaticity adjusting method includes: selecting a plurality of chromaticity nodes in a color gamut; calculating a plurality of correction ratio values corresponding to a plurality of grayscale values of each of the chromaticity nodes, wherein the correction ratios are The values are used to adjust the grayscale output characteristics of each of the grayscale values relative to a frontal viewing angle at one viewing angle; constructing a lookup table of the color gamut, wherein the lookup table is used to find the The correction ratio values corresponding to the chroma nodes; and smoothing the correction ratio values based on each of the grayscale values to update the lookup table. The chromaticity adjustment method according to claim 7, further comprising: calculating a plurality of specified correction ratio values of at least one specified chromaticity; and adjusting the correction ratio values corresponding to a chroma set to update according to the specified correction ratio values. In the query table, the chromaticity nodes included in the chromaticity set are adjacent to the at least one specified chromaticity in the query table. The chromaticity adjusting method according to claim 7, wherein the correction ratio values corresponding to at least one of the grayscale values are smaller than a threshold value. The chroma adjusting method according to claim 7, wherein smoothing the correction ratio values includes: smoothing the correction ratio values according to a median filtering algorithm and a moving average algorithm. The chromaticity adjusting method according to claim 7, wherein the grayscale output characteristic is a main-subpixel pixel separation gamma ratio of each of the grayscale values. A display panel driver includes: a memory for storing a look-up table, wherein the look-up table is constructed by the chromaticity adjustment method of any one of the requested items 7 to 11; and a driving circuit, coupled To the memory and used to drive a display panel according to the lookup table and a plurality of image signals corresponding to the chromaticity nodes. The display panel driver according to claim 12, wherein when the plurality of image signals used to drive the display panel do not correspond to the chromaticity nodes, the driving circuit drives the display panel according to the lookup table and an interpolation algorithm. The display panel driver according to claim 12, wherein the lookup table is further processed by an interpolation algorithm, and when the plurality of image signals used to drive the display panel do not correspond to the chroma nodes, the driving circuit is based on the The lookup table processed by the interpolation algorithm drives the display panel.