Pixel compensation method suitable for multi-backlight partitioning

Abstract

This invention discloses a pixel compensation method applicable to multiple backlight zones, comprising: firstly, performing an illuminance range test on a single LED to obtain a two-dimensional illuminance distribution matrix E(x,y); converting the two-dimensional illuminance distribution matrix E(x,y) into a one-dimensional illuminance weight data matrix H(d); calculating the pixel distance d' between the pixel to be compensated and the projected pixels of each LED in its backlight neighborhood; and indexing the pre-stored one-dimensional illuminance data matrix H(d) to obtain the illuminance weight H(d') of each backlight zone in the backlight neighborhood corresponding to the pixel distance d'. ij， Then, the pixel backlight value Brt of the pixel to be compensated is calculated by weighted summation. pxl ; with pixel backlight value Brt pxl Using the index, the pixel compensation coefficient corresponding to the pixel to be compensated is obtained by looking up the table, and the original RGB data stream is multiplied by the compensation coefficient to obtain the compensated pixel value.

Description

Technical Field

[0001] This invention relates to the field of LED backlight display technology, and in particular to a pixel compensation method applicable to multiple backlight zones. Background Technology

[0002] With the development of Mini-LED backlight technology, local dimming technology has gradually become the mainstream in the industry in order to improve screen brightness and contrast. However, since local dimming technology is different from the original global backlight technology, the backlight brightness of different backlight zones is different in each frame. Therefore, pixel compensation is required for the original RGB image data to ensure correct screen display.

[0003] like Figure 1 The pixel compensation process in the prior art backlight zone display, as shown, involves the original RGB image data undergoing zone backlight control calculations to obtain the brightness values ​​of each backlight zone. These brightness values ​​are then input to the zone backlight controller to control the Mini-LED backlight panel for backlight illumination. Pixel brightness compensation is then performed based on the brightness values ​​of each backlight zone to obtain compensated RGB image data. This compensated RGB image data is then input to the pixel display driver controller to control the LCD panel for image display.

[0004] When performing pixel compensation, the backlight brightness of each pixel is affected not only by its own backlight zone but also by its neighboring backlight zones. Furthermore, the weights of the influence of other backlight zones on the backlight illumination of that pixel differ. Therefore, as... Figure 2 As shown, if we consider the backlight impact on pixels within a 5×5 backlight zone, then for any pixel in any backlight zone, 5×5 = 25 weight data points need to be pre-stored. Taking a pixel array at 4K (3840x2160) resolution as an example, if there are 500 backlight zones, then each backlight zone contains 16,589 pixels, and the weight data for one backlight zone is 415,000 (16,589 × 25). This weight data requires a huge amount of storage space for the display system, especially when the display panel resolution is high and the number of backlight zones is small, the drawback is even more pronounced.

[0005] Therefore, it is evident that there is a need in the existing technology for a new pixel compensation method applicable to multiple backlight zones, thereby achieving data compression and reducing the storage space required for pre-data. Summary of the Invention

[0006] The technical objective of this invention is to provide a pixel compensation method applicable to multiple backlight zones.

[0007] Based on the above technical purposes, the present application provides a pixel compensation method suitable for multi-backlight partition, which comprises:

[0008] S100, first, the illumination range test of single LED lamp is carried out to obtain a two-dimensional illumination distribution matrix E(x, y);

[0009] S101, the two-dimensional illumination distribution matrix E(x, y) is converted into a one-dimensional illumination weight data matrix H(d); the d represents the pixel distance between the LED projection pixels and is an integer, and the value range is 0≤d≤D; the D is the maximum integer not more than ;

[0010] S102, the pixel distance d' of the pixel to be compensated and each LED lamp projection pixel in its backlight neighborhood is calculated; the backlight neighborhood is a (2N+1)×(2N+1) backlight matrix, and the N is a positive integer greater than or equal to 1;

[0011] S103, the one-dimensional illumination data matrix H(d) pre-stored is indexed to obtain the illumination weight H(d') corresponding to each backlight partition in the backlight neighborhood of the pixel distance d'; ij , -N≤i≤N, -N≤j≤N, and the pixel backlight value Brto be compensated is calculated by the weighted summation method pxl ;

[0012] S104, the pixel backlight value Brto be compensated pxl is indexed to obtain the pixel compensation coefficient corresponding to the pixel to be compensated by table lookup, and the original RGB data stream is multiplied by the compensation coefficient to obtain the compensated pixel value.

[0013] In one embodiment, the specific conversion process of converting the two-dimensional illumination distribution matrix E(x, y) into the one-dimensional illumination weight data matrix H(d) comprises:

[0014] If 0≤d≤M, then

[0015] If M+1≤d≤D, then H(d) is obtained by interpolating the data on the diagonal line of E(x, y), that is:

[0016]

[0017] Wherein:

[0018]

[0019]

[0020] The d + is the minimum integer greater than or equal to , that is, the value of d is rounding up, denoted as the d - is less than or equal to the maximum integer, i.e. rounding down, denoted as

[0021] In one embodiment, the pixel backlight value Brt of the pixel to be compensated is calculated by weighted summation pxl The calculation method comprises:

[0022]

[0023] In one embodiment, N=2, i.e. the backlight neighborhood is a 5x5 backlight partition matrix.

[0024] In one embodiment, the compensation coefficient is preset data according to the brightness level coding.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate the present application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the pertinent art to make and use the application.

[0027] Figure 1 is a pixel compensation process flowchart of LED multi-partition backlight in the prior art;

[0028] Figure 2 is a 5x5 backlight partition weight distribution diagram in the pixel compensation of multi-partition backlight in the prior art;

[0029] Figure 3 is a flowchart of the pixel compensation method of the present application suitable for multi-backlight partition;

[0030] Figure 4 is an illuminance test and illuminance influence range distribution diagram of the present application;

[0031] Figure 5 is a two-dimensional illuminance distribution matrix diagram of the present application. DETAILED DESCRIPTION

[0032] To make the objects, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings.

[0033] It will be understood that when an element or layer is referred to as being "on", "adjacent", "connected" or "coupled" to another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected", or "directly coupled" to another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application. Similarly, a second element, component, region, layer or section discussed below could be termed a first element, component, region, layer or section without departing from the teachings of the present application.

[0034] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] Example 1

[0037] As Figures 3-4The pixel compensation method of the application suitable for multi-backlight partitioning is shown, which comprises:

[0038] S100, first, the illumination range test of single LED lamp is carried out to obtain a two-dimensional illumination distribution matrix E(x, y). Herein, x and y respectively represent the horizontal pixel number and the vertical pixel number of the projection pixel of the single LED lamp on the display panel, the two-dimensional illumination data contains the same horizontal pixel size and vertical pixel size, and the absolute value of the maximum pixel number is recorded as M, such as Figure 4 If M is 400, the value range of x and y in E(x, y) is -M≤x≤M, -M≤y≤M.

[0039] S101, the two-dimensional illumination data E(x, y) is converted into one-dimensional illumination weight data matrix H(d) by using the center symmetry and stored. The d represents the pixel distance between the LED projection pixel and is an integer, and the value range is 0≤d≤D. The D is the maximum integer not more than The specific conversion method is as follows:

[0040] If 0≤d≤M, then

[0041] If M+1≤d≤D, then H(d) is obtained by interpolating the data on the diagonal line of E(x, y), that is:

[0042]

[0043] Among them:

[0044]

[0045] Herein, d + is the minimum integer greater than or equal to , that is, the upward rounding of , which is expressed as d - is the maximum integer less than or equal to , that is, the downward rounding of , which is expressed as

[0046] S102, the pixel distance d' of the pixel to be compensated and each LED lamp projection pixel in its backlight neighborhood is calculated. The backlight neighborhood is a (2N+1)×(2N+1) backlight matrix, and the N is a positive integer greater than or equal to 1, and in the embodiment, N=2, that is, the backlight neighborhood is a 5×5 backlight partitioning matrix. At the same time, the pixel to be compensated is located in the center backlight partition of the backlight neighborhood.

[0047] S103, index pre-stored one-dimensional illumination data matrix H(d) obtains pixel distance d' corresponding to the illumination weight H(d') of each backlight partition in the backlight neighborhood ij , and then the pixel backlight value Brt of the pixel to be compensated is calculated by weighted summation pxl . Taking a 5x5 backlight partition matrix as an example, the calculation method is as follows:

[0048] -N≤i≤N; -N≤j≤N;

[0049] The Brt zone (i,j) is the luminance value of the backlight partition with horizontal partition distance i and vertical partition distance j of the backlight partition where the pixel to be compensated is located, and the luminance value is the luminance value of each backlight partition generated by the partition backlight control operation.

[0050] S104, taking the pixel backlight value Brt pxl as an index, the corresponding pixel compensation coefficient of the pixel to be compensated is obtained by table lookup, and the original RGB data stream is multiplied by the compensation coefficient to obtain the compensated pixel value. In this embodiment, the compensation coefficient is pre-set data, for example, when the brightness level is pre-set to 10 bits, there are 2 10 =1024 kinds of brightness encoding, if the pixel backlight value Brt pxl calculated is 2 9 =512, and the gamma value of the display panel is 2.2, then the compensation coefficient is

[0051] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pixel compensation method suitable for multi-backlight partitioning, characterized in that: The pixel compensation method comprises: S100, first, the illumination range test of single LED lamp is carried out, and a two-dimensional illumination distribution matrix E(x, y) is acquired; x and y respectively represent the horizontal pixel number and the vertical pixel number of the projection pixel of single LED lamp on the display panel; S101, converting the two-dimensional illuminance distribution matrix E(x, y) into a one-dimensional illuminance weight data matrix H(d); the d represents the pixel distance between the LED projection pixels and is an integer, the value range is 0≤d≤D; the D is the maximum integer not more than ; M is the maximum pixel absolute value, and the two-dimensional illuminance data contains the same horizontal and vertical pixel sizes; S102, the pixel distance d' of the to-be-compensated pixel and each LED lamp projection pixel in the backlight neighborhood thereof is calculated; the backlight neighborhood is a (2N+1)×(2N+1) backlight matrix, and N is a positive integer greater than or equal to 1; S103, index pre-stored one-dimensional illumination data matrix H(d) obtains the illumination weight H(d') corresponding to each backlight partition in the backlight neighborhood of the pixel distance d' ij , -N≤i≤N, -N≤j≤N, the pixel backlight value Brt of the pixel to be compensated is calculated by the way of weighted summation pxl ; S104, with pixel backlight value Brt pxl As an index, the corresponding pixel compensation coefficient of the pixel to be compensated is obtained by looking up the table, and the original RGB data stream is multiplied by the compensation coefficient to obtain the compensated pixel value.

2. The pixel compensation method according to claim 1, characterized in that: the specific conversion process of converting the two-dimensional illumination distribution matrix E(x, y) into a one-dimensional illumination weight data matrix H(d) comprises: If 0≤d≤M, then if M+1≤d≤D, H(d) is obtained by interpolating the data on the diagonal line of E(x, y), namely: wherein: The d + is the minimum integer greater than or equal to , i.e. the ceiling of , denoted by The d - is the maximum integer less than or equal to is the maximum integer less than or equal to is the maximum integer less than or equal to 3. The pixel compensation method of claim 1, wherein: The pixel backlight value Brt of the pixel to be compensated is calculated by weighted summation pxl The calculation method comprises:

4. The pixel compensation method of claim 1, wherein: N=2, that is, the backlight neighborhood is a 5×5 backlight partition matrix.

5. The pixel compensation method of claim 1, wherein: The compensation coefficient is preset data according to the brightness level coding.

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