CN110930955A - Display and brightness adjusting method thereof - Google Patents
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- CN110930955A CN110930955A CN201911361841.4A CN201911361841A CN110930955A CN 110930955 A CN110930955 A CN 110930955A CN 201911361841 A CN201911361841 A CN 201911361841A CN 110930955 A CN110930955 A CN 110930955A
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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Abstract
The invention relates to a brightness adjusting method of a display, which comprises the following steps: and acquiring a light transmittance distribution matrix A of the display panel. And acquiring a rated brightness distribution matrix B of the backlight source. The number of rows and columns of the matrix a is equal to that of the matrix B, and the matrix C is set to a × B. And obtaining a target output power matrix D of the backlight source according to the target display brightness distribution matrix E1 and the matrix C of the display. The number of rows and columns of the matrix C, the matrix D, and the matrix E1 is equal, the value of each element in the matrix E1 is equal, and the value obtained by sequentially dividing each element in the matrix E1 by the element at the corresponding position in the matrix C is the value of the element at the corresponding position in the matrix D. And the driving module controls the output power of each light-emitting unit in the backlight source according to the matrix D. The application also relates to a display adjusted by adopting the brightness adjusting method. According to the brightness adjusting method, the output of the backlight source is controlled according to the matrix D, and the uniform light emitting effect of the display is achieved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display and a brightness adjusting method of the display.
Background
In the traditional direct-projection liquid crystal display, a driving module controls a direct-projection backlight source to emit light, an image is formed after modulation of a liquid crystal panel, and the modulation effect of the liquid crystal panel on the light emitted by the backlight source is changed by changing the arrangement of liquid crystals in the liquid crystal panel so as to form different images. However, in the conventional direct-type liquid crystal display, because the brightness of light emitted from the direct-type backlight source is uneven, or because the internal structure of the liquid crystal panel has defects, the light transmittance of each area of the liquid crystal panel is different, the display brightness of the direct-type liquid crystal display is unevenly distributed, and the imaging effect is affected.
Disclosure of Invention
Accordingly, it is desirable to provide a direct-lit liquid crystal display and a method for adjusting brightness of the direct-lit liquid crystal display.
A display, comprising:
the light transmittance distribution matrix of the display panel is a matrix A;
the backlight source comprises a plurality of light emitting units, a rated brightness distribution matrix of the backlight source is a matrix B, the number of rows and columns of the matrix A is equal to that of the matrix B, and a matrix C is set to be A B;
a driving module, configured to control output powers of light emitting units in the backlight source, so that an actual output power matrix of the backlight source is a matrix D, where a display luminance distribution matrix of the display is set as a matrix E1, a numerical value of each element in the matrix E1 is equal, row numbers and column numbers of the matrix C, the matrix D, and the matrix E1 are equal, and the matrix C, the matrix D, and the matrix E1 satisfy a relation: e1 ═ C × D.
In one embodiment, the matrix a, the matrix B, and the matrix D are normalized matrices.
In one embodiment, the value of each element in the matrix E1 is equal to the value of the least valued element in the elements of the matrix C.
In one embodiment, the matrix D has j × k elements, where j and k are the number of rows and columns of the light-emitting units in the backlight respectively, and an element in one of the matrices D is a percentage of an actual output power of a corresponding one of the light-emitting units of the backlight to a rated power.
In one embodiment, the matrix B has j × k elements, where j and k are the number of rows and columns of the light-emitting units in the backlight, respectively, and the numerical values of the elements in one of the matrices B correspond to the luminance values of the light-emitting units of the backlight at the rated power.
In one embodiment, the display panel is a liquid crystal panel.
In the display, the driving module controls the output power of each light-emitting unit in the backlight source according to the matrix D, adjusts the light-emitting brightness of different areas of the backlight source, and finally makes the actual display brightness distribution matrix E of the display equal to the matrix E1 by matching with the light transmittance distribution matrix of the display panel and the rated brightness distribution matrix of the backlight source, so that the uniform light-emitting effect of the display is realized.
A brightness adjustment method of a display comprises the following steps:
acquiring a light transmittance distribution matrix of a display panel, and setting the light transmittance distribution matrix of the display panel as a matrix A;
acquiring a rated brightness distribution matrix of a backlight source, and setting the rated brightness distribution matrix of the backlight source as a matrix B, wherein the number of rows and the number of columns of the matrix A are equal to that of the matrix B, and setting a matrix C to A B;
obtaining a target output power matrix D of the backlight source according to a target display brightness distribution matrix E1 of the display and the matrix C, where the number of rows and columns of the matrix C, the matrix D, and the matrix E1 are equal, the number of each element in the matrix E1 is equal, and the number obtained by sequentially dividing each element in the matrix E1 by the element at the corresponding position in the matrix C is the number of the element at the corresponding position in the matrix D;
and the driving module controls the output power of each light-emitting unit in the backlight source according to the matrix D.
In one embodiment, the number of rows and columns of the matrix B is equal to the number of rows and columns of the light-emitting units of the backlight, each light-emitting unit of the backlight corresponds to an element in one of the matrices B, and the output power of the corresponding light-emitting unit of one of the backlights is controlled according to an element in one of the matrices D.
In one embodiment, a standard backlight source which emits light uniformly is adopted for emitting light from the light incident surface of the display panel, and the brightness distribution matrix of the light emergent surface of the display panel is detected to obtain the matrix a.
In one embodiment, the light emitting surface of the display panel is divided into j × k regions with equal size, where j and k are the number of rows and columns of the matrix B, respectively, and the brightness value of each region is detected to obtain the matrix a; or
The light emitting surface of the display panel is provided with m × n pixels, the brightness values of the pixels on the light emitting surface of the display panel are respectively detected, a pixel brightness distribution matrix A1 of the display panel is obtained, the pixel brightness distribution matrix A1 is subjected to matrix blocking and is divided into j × k sub-blocks, the number of elements in each sub-block is equal, j and k are respectively the row number and the column number of the matrix B, and the average value of each element in each sub-block is used as the numerical value of the element of the corresponding position to obtain the matrix A.
According to the brightness adjusting method of the display, the matrix D is obtained through the matrix A, the matrix B and the set matrix E1, the driving module controls the output power of each light-emitting unit in the backlight source according to the matrix D, and finally the actual display brightness distribution matrix E of the display is equal to the matrix E1, so that the uniform light-emitting effect of the display is achieved.
Drawings
FIG. 1 is a diagram illustrating a method for adjusting brightness of a display according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a display according to an embodiment of the present application;
FIG. 3 is a schematic view of a backlight in a display according to one embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a backlight in a display according to another embodiment of the present disclosure.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 1, a method for adjusting brightness of a display includes:
step S01, obtaining a transmittance distribution matrix of the display panel, and setting the transmittance distribution matrix of the display panel as a matrix a.
Specifically, in some embodiments, the light is emitted by using a standard backlight source that emits light uniformly at the light incident surface of the display panel, and the luminance values of different areas on the light emergent surface of the display panel are detected by the light sensors, so as to obtain a luminance distribution matrix of the light emergent surface of the display panel. Because the product of the light transmittance of the display panel and the light-emitting brightness value of the standard backlight source is the brightness value of the light-emitting surface of the display panel, and the standard backlight source emits light uniformly, the light transmittance of the display panel and the brightness value of the light-emitting surface of the display panel have a multiple relation. Therefore, in some embodiments, to simplify the detection process, the luminance distribution matrix of the light-emitting surface of the display panel when the standard backlight is adopted may be used as the matrix a. It should be noted that, in the present application, the standard backlight source with uniform light emission does not mean that the light emission of the standard backlight source is completely and uniformly distributed, and due to the deviation in the structural design, assembly and driving control processes, the standard backlight source may have a partially high or low light emission brightness value, as long as the light emission uniformity of the adopted standard backlight source meets the light emission uniformity required by production.
Step S02, obtaining a rated luminance distribution matrix of the backlight source, and setting the rated luminance distribution matrix of the backlight source as a matrix B, where the number of rows and columns of the matrix a is equal to that of the matrix B, and the matrix C is set to a × B.
Specifically, in some embodiments, the value of each element in the matrix B is the brightness value of the corresponding light-emitting unit on the backlight at the rated power. For example, the value of the element in row 2 and column 3 in the matrix B can be understood as the brightness value of the lighting unit in row 2 and column 3 on the backlight under the rated power.
It should be noted that, in the present application, the result of the multiplication operation between two matrices can be understood as the Hadamard product (Hadamard product) of the two matrices. For example, the result of matrix a × B is the hadamard product of matrix a and matrix B. Specifically, according to the definition of the hadamard product, in the present application, the matrix C is defined as a × B, which is to be understood that the product of each element in the matrix a and the element at the corresponding position in the matrix B is the value of the element at the corresponding position in the matrix C. In addition, in the present application, it is described that the position of one element a1 in the matrix a corresponds to the position of one element B1 in the matrix B, and it can be understood that the number of rows and columns of the element a1 in the matrix a is equal to the number of rows and columns of the element B1 in the matrix B, respectively. For example, in some embodiments, if element a1 is in row 2, column 3 in matrix a and element B1 is in row 2, column 3 in matrix B, then it can be understood that the position of element a1 in matrix a corresponds to the position of element B1 in matrix B.
In particular, in some embodiments, the matrix B has j × k elements. J and k are respectively the number of rows and columns of the light-emitting units of the backlight source, and the numerical value of an element in one matrix B corresponds to the brightness value of one light-emitting unit of the backlight source under the rated power. In some embodiments, the output powers of all the light emitting units of the backlight source are rated powers, and the luminance of light emitted by each light emitting unit of the backlight source is detected by using a light sensor, so as to obtain a rated luminance distribution matrix of the backlight source. It should be noted that in the present application, a matrix is described as having j × k elements, which is understood to mean that the number of rows of the matrix is j and the number of columns of the matrix is k. While the backlight is described as having j × k light emitting units, it is understood that the number of rows of light emitting units is j and the number of columns of light emitting units is k in the backlight.
It is understood that, since the matrix C is a × B, the matrix C may be understood as a display luminance distribution matrix of the display when the output powers of the light emitting units on the backlight are all rated powers.
Further, in some embodiments, m × n pixels are provided on the light emitting surface of the display panel, in the process of obtaining the matrix a, a standard backlight source that emits light uniformly is adopted for emitting light on the light incident surface of the display panel, and the luminance values of the pixels on the light emitting surface of the display panel are detected by using light sensors respectively, so as to obtain a pixel luminance distribution matrix a1 of the display panel, and then the pixel luminance distribution matrix is used to obtain the matrix a. In particular, in some embodiments, it is assumed that the backlight has j × k light emitting cells, and the matrix B has j × k elements, where each element in the matrix B corresponds to one light emitting cell of the backlight. Since the number of elements of the matrix a is equal to that of the matrix B, the number m × n of the light emitting surfaces of the display panel is generally much larger than the number j × k of the light emitting units of the backlight. Thus, in some embodiments, to obtain the matrix a, the pixel intensity distribution matrix a1 may be partitioned into j × k sub-blocks, each sub-block having (m × n)/(j × k) elements. And taking the average value of each element in each sub-block as the numerical value of the corresponding element to obtain the matrix A.
Furthermore, since the number m × n of pixels on the light emitting surface of the display panel is large, it is difficult to detect the pixel luminance distribution matrix. Therefore, in some embodiments, to simplify the detection process, the light emitting surface of the display panel may be divided into j × k regions with equal size, where j and k are the number of rows and columns of the matrix B, respectively, that is, the number of rows and columns of the light emitting units of the backlight source. And respectively detecting the brightness value of each area by using a light sensor to obtain the matrix A.
And step S03, obtaining a target output power matrix D of the backlight source according to the target display brightness distribution matrix E1 of the display and the matrix C.
Wherein the number of rows and columns of the matrix C, the matrix D and the matrix E1 are equal, and the value of each element in the matrix E1 is equal. The numerical value obtained by dividing each element in the matrix E1 by the element at the corresponding position in the matrix C in turn is the numerical value of the element at the corresponding position in the matrix D. It can be understood that the matrix C, the matrix D, and the matrix E1 satisfy the relation: e1 ═ C × D.
It should be noted that, in the present application, the display luminance distribution matrix of the display may be understood as the luminance distribution matrix of the light emitting surface of the display panel after the backlight is in the light emitting surface of the display panel.
And step S04, the driving module controls the output power of each light-emitting unit in the backlight source according to the matrix D.
It is understood that, in some embodiments, the matrix E1 is a target display luminance distribution matrix of the display, that is, the luminance adjustment method of the display aims to make the actual display luminance distribution matrix E of the display equal to the matrix E1, and make the values of the elements in the matrix E equal to the values of the elements in the corresponding positions in the matrix E1. Since the values of the elements in the matrix E1 are equal, the values of the elements in the actual display brightness distribution matrix E of the display are equal, so as to achieve the uniform light emitting effect of the display. In addition, in some embodiments, since the matrix C may be understood as a display luminance distribution matrix of the display when the output powers of the light emitting units on the backlight are all rated powers, if the value of each element in the matrix E1 is set to be greater than the value of the element with the smallest value among the elements of the matrix C, when the actual display luminance distribution matrix E of the display is equal to the matrix E1, the output powers of some light emitting units in the backlight are greater than the rated powers, which easily causes the damage of the light emitting units. Thus, in some embodiments, the value of each element of the matrix E1 is set to be equal to the value of the least valued element of the elements of the matrix C. At this time, when the actual display luminance distribution matrix E of the display is equal to the matrix E1, the output power of the light emitting unit corresponding to the element position with the smallest value among the elements of the matrix C in the backlight is the rated power, and the output power of the remaining light emitting units is smaller than the rated power. So set up, can realize even light-emitting effect, also can avoid the damage of luminescence unit simultaneously.
Further, in some embodiments, the matrix D has j × k elements, where j and k are the number of rows and columns of the light-emitting units in the backlight respectively, and an element in one of the matrices D is a percentage of an actual output power of the light-emitting unit of a corresponding one of the backlights to a rated power. Specifically, in some embodiments, the driving module controls the output power of each light emitting unit in the backlight source by using Pulse Width Modulation (PWM), and the output power of each light emitting unit is controlled by a corresponding one of the PWM waveforms. More specifically, in some embodiments, the PWM waveform has the highest amplitude, and the percentage of the actual amplitude of the PWM waveform to the highest amplitude can be understood as the percentage of the output power of the light emitting unit corresponding to the PWM waveform to the rated power. It should be noted that the driving module controls the output power of each light-emitting unit in the backlight according to the matrix D, and at this time, in an ideal state, the actual output power matrix D1 of each light-emitting unit in the backlight should be equal to the target output power matrix D. However, in an actual scenario, due to defects of the driving module or the backlight itself, or due to a deviation of current transmission, etc., the actual output power matrix D1 of the backlight may deviate from the matrix D.
It is understood that, at this time, the matrix D may be understood as an output power compensation matrix of the backlight source formed according to the matrix C, and the driving module controls the output power of each light emitting unit in the backlight source according to the matrix D. By reducing the output power of the light-emitting unit corresponding to the region with higher display brightness value of the display under the rated power, the output power of the light-emitting unit corresponding to the region with higher display brightness value of the display under the rated power is smaller, so that the display brightness distribution of the display is balanced finally, and the effect of uniform light emission of the display is realized.
Further, in some embodiments, the matrix a, the matrix B, and the matrix D are all normalized matrices. It is to be understood that, in the present application, when a certain matrix is described as a normalized matrix, it is understood that the matrix is subjected to normalization processing. Specifically, in some embodiments, a certain matrix is normalized, which may be understood as dividing all elements in the matrix by the element with the largest value among the elements in the matrix. For example, in some embodiments, the matrix a is described as a normalized matrix, which may be understood as dividing each element in the transmittance distribution matrix of the display panel by the maximum value in each element of the transmittance distribution matrix of the display panel to obtain the matrix a. At this time, the maximum value of each element in the matrix a is 1. The matrix is normalized, so that the numerical value of each element in the matrix can be simplified, and the operation of the matrix is simpler and more convenient.
In addition, in some embodiments, the display panel is a liquid crystal panel, and in this case, the display is a liquid crystal display. It should be noted that, in this case, when obtaining the matrix a, the liquid crystals in each area of the display panel should be in the same arrangement state, so as to avoid the difference in transmittance of different areas of the display panel due to the difference in arrangement state of the liquid crystals in each area. Of course, the display can also be other types of modulation type displays, and different images are formed by changing the modulation effect of the display panel on the light emitted by the backlight source.
The adjustment process of the brightness distribution of the light emitted by the display by the method is embodied by the specific calculation process of the brightness adjustment method of the display in the adjustment in some embodiments.
In some embodiments, taking the number of pixels on the light emitting surface of the display panel as 1800 × 1200 and the number of light emitting units of the backlight as 24 × 16 as an example, the light is emitted by a standard backlight, and the luminance of each pixel of the display panel is detected respectively, so as to obtain the pixel luminance distribution matrix a1 of the display panel, where the pixel luminance distribution matrix a1 has 1800 × 1200 pixels. After the pixel brightness distribution matrix is subjected to normalization processing, the pixel brightness distribution matrix of the display panel is partitioned into 24 × 16 sub-blocks, each sub-block contains 75 × 75 elements, and the average value of the elements in each sub-block is used as the numerical value of the element at the position corresponding to the sub-block in the matrix A to obtain the following matrix A:
it is understood that, at this time, the matrix a has 24 × 16 elements, and for simplifying the operation process, only the values of some of the elements are shown, and the ellipses indicate the elements not shown.
Then, the brightness values of the light-emitting units of the backlight under rated power are respectively detected to obtain a rated brightness distribution matrix of the backlight, and the rated brightness distribution matrix of the backlight is normalized to obtain a matrix B as follows:
taking the hadamard product of the matrix a and the matrix B as a matrix C, that is, the matrix C is a × B, to obtain the following matrix C:
in this case, the matrix C may be understood as a display luminance distribution matrix of the display when the output powers of the light emitting units on the backlight are all rated powers. To avoid the light emitting units of the backlight from being damaged, the minimum value of 0.76 in each element of the matrix C is used as the value of each element in the matrix E1. It is understood that, in some embodiments, the purpose of the brightness adjustment method of the display is to make the brightness values of the adjusted regions of the display equal to each other, and equal to the brightness values of the regions of the display corresponding to the elements of the matrix C with the value of 0.76 under the rated power. At this time, the matrix E1 is as follows:
then, the matrix D is obtained according to the matrix C and the matrix E1. It is to be understood that, in some embodiments, the numerical value of each element in the matrix D may be understood as a percentage of the output power of the light-emitting unit of the corresponding backlight to the rated power, and the matrix C may be understood as a display luminance distribution matrix of the display when the output powers of the light-emitting units on the backlight are equal to the rated power. Thus, at this time, matrix C, matrix D, and matrix E1 satisfy the relationship: e1 ═ C × D. As a result, the value obtained by sequentially dividing each element in the matrix E1 by the element at the corresponding position in the matrix C is the value of the element at the corresponding position in the matrix D, that is:
it is noted that in some embodiments, the values of the matrix E1 take the minimum value of 0.76 in the matrix C, and since the matrix C is a B, the minimum value in the matrix C is the product of the minimum value of 0.8 in the matrix a and the minimum value of 0.95 in the matrix B. Thus, in some embodiments, the matrix E1 may be replaced by defining an adaptation factor. For example, the minimum value in the matrix a is defined as an adaptation factor X, and in some embodiments, X is 0.8. And defining the minimum value in the matrix B as an adaptation factor Y, in some embodiments, Y is 0.95. The adaptation factor X and Y result in an adaptation factor X Y0.8X 0.95X 0.76 for the matrix C. At this time, the value obtained by sequentially dividing the adaptation factor of the matrix C by each element in the matrix C is the value of the element at the corresponding position in the matrix D. By defining the adaptation factors X and Y and obtaining the adaptation factor X Y of the matrix C from the adaptation factors X and Y, and further obtaining the matrix D, the matrix E1 is not required to be defined for operation, thereby simplifying the operation flow. In particular, in other embodiments, when the element positions of the minimum values in the matrix a and the minimum values in the matrix B do not correspond, the minimum values in the matrix C are calculated as the adaptation factors of the matrix C.
In addition, since the value of each element in the matrix D can be understood as the percentage of the output power of the light-emitting unit of the corresponding backlight source to the rated power, in some embodiments, to make the data more intuitive, the value of each element in the matrix D can be converted into a percentage form, so as to obtain the following matrix D:
and finally, inputting the matrix D into a control module of the backlight source, wherein the control module respectively controls the output power of the corresponding light-emitting unit in the backlight source according to the numerical value of each element in the matrix D, and finally the actual display brightness distribution matrix E of the display is equal to the matrix E1, so that the effect of uniform light emission is realized.
It should be noted that, in the actual adjustment process, due to the limited operation accuracy of each element of the matrix, the deviation of the control module of the backlight source for controlling the output power of the light-emitting unit of the backlight source, the influence of other parts in the display on the light emission, and other factors, the actual display luminance distribution matrix E of the final display may deviate from the values in the matrix E1. However, by using the above-described method for adjusting the luminance of a display in a display, since the matrix E1 is C × D, the numerical value of each element in the actual display luminance distribution matrix E of the display can be made equal to or as close as possible to the numerical value of the element at the corresponding position in the matrix E1, even if the display uniformity of the display is greatly improved before the adjustment. Therefore, the brightness adjusting method of the display can greatly improve the display brightness uniformity of the final emergent light of the display and realize the uniform emergent light effect by controlling the output power of each light-emitting unit in the backlight source according to the matrix D.
Referring to fig. 2, a display 200 with adjusted brightness includes a display panel 210, a backlight 220 and a driving module 230. The backlight 220 is located on one side of the light incident surface of the display panel 210, the backlight 220 includes a light emitting unit 221, and light emitted by the light emitting unit 221 is modulated by the display panel 210 and then emitted from the light emitting surface of the display panel 210. The driving module 230 controls the output power of each light emitting unit 221 in the backlight 220.
Further, the transmittance distribution matrix of the display panel 210 satisfies the matrix a. The rated luminance distribution matrix of the backlight 220 satisfies the matrix B, where the number of rows and columns of the matrix a is equal to the number of columns of the matrix B, and the matrix C is set to a × B. The driving module 230 is configured to control output power of each light emitting unit in the backlight 220, so that an actual output power matrix of the backlight 220 is a matrix D. The display brightness distribution matrix of the display 200 is set as a matrix E1, the numerical value of each element in the matrix E1 is equal, the number of rows and columns of the matrix C, the matrix D, and the matrix E1 is equal, and the matrix C, the matrix D, and the matrix E1 satisfy the following relation: e1 ═ C × D. When the matrix C, the matrix D, and the matrix E1 satisfy the above relation, the actual display luminance distribution matrix E of the display 200 is equal to the matrix E1, so that the uniform light emitting effect of the display 200 is achieved.
It is understood that in some embodiments, the display 200 may be a liquid crystal display and the display panel 210 may be a liquid crystal panel. Also, in some embodiments, the driving module 230 is a PWM power driving module, and PWM is used to control the output power of each light emitting unit 221 of the backlight 220. In addition, in some embodiments, as shown in fig. 3, the backlight 220 is a direct-light backlight, and the light emitting units 221 of the backlight 220 may be arranged in one dimension, while as shown in fig. 4, in other embodiments, the backlight 220 may also be arranged in two dimensions. Further, in some embodiments, when the light emitting units 221 of the backlight 220 are arranged in one dimension, the number of rows of the matrix B is 1, or the number of columns of the matrix B is 1, and when the light emitting units 221 of the backlight 220 are arranged in two dimensions, both the number of rows and the number of columns of the matrix B are greater than 1.
Further, in some embodiments, the light exit uniformity of the display 200 may be detected using a dimmer (ND filter) where the lower the mura phenomenon visibility on the display 200, the higher the light exit uniformity of the display 200.
According to the brightness adjusting method of the display, the matrix D is obtained through the matrix A, the matrix B and the set matrix E1, the output of the backlight source is controlled according to the matrix D, the actual display brightness distribution matrix E of the display is equal to the matrix E1, and the uniform light emitting effect of the display is achieved.
In the display 200, the output of the backlight 220 is controlled according to the matrix D, the light-emitting brightness in different areas of the backlight 220 is adjusted, and the actual display brightness distribution matrix E of the display 200 is finally equal to the matrix E1 by matching the light transmittance distribution matrix of the display panel 210 and the brightness distribution matrix of the backlight 220, so that the uniform light-emitting effect of the display 200 is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A display, comprising:
the light transmittance distribution matrix of the display panel is a matrix A;
the backlight source comprises a plurality of light emitting units, a rated brightness distribution matrix of the backlight source is a matrix B, the number of rows and columns of the matrix A is equal to that of the matrix B, and a matrix C is set to be A B;
a driving module, configured to control output powers of light emitting units in the backlight source, so that an actual output power matrix of the backlight source is a matrix D, where a target display luminance distribution matrix of the display is set as a matrix E1, a numerical value of each element in the matrix E1 is equal, row numbers and column numbers of the matrix C, the matrix D, and the matrix E1 are equal, and the matrix C, the matrix D, and the matrix E1 satisfy a relation: e1 ═ C × D.
2. The display of claim 1, wherein the matrix a, the matrix B, and the matrix D are normalized matrices.
3. The display of claim 1, wherein the value of each element of the matrix E1 is equal to the value of the least valued element of the elements of the matrix C.
4. The display according to claim 1, wherein the matrix D has j x k elements, where j and k are the number of rows and columns of light-emitting units in the backlight, respectively, and the element in one of the matrices D is the percentage of the actual output power of the light-emitting units of the corresponding one of the backlights to the rated power.
5. The display according to claim 1, wherein the matrix B has j x k elements, where j and k are the number of rows and columns of light-emitting units in the backlight, respectively, and the number of elements in one of the matrices B corresponds to the luminance value of one of the light-emitting units of the backlight at the rated power.
6. The display according to any one of claims 1 to 5, wherein the display panel is a liquid crystal panel.
7. A method for adjusting brightness of a display, comprising:
acquiring a light transmittance distribution matrix of a display panel, and setting the light transmittance distribution matrix of the display panel as a matrix A;
acquiring a rated brightness distribution matrix of a backlight source, and setting the rated brightness distribution matrix of the backlight source as a matrix B, wherein the number of rows and the number of columns of the matrix A are equal to that of the matrix B, and setting a matrix C to A B;
obtaining a target output power matrix D of the backlight source according to a target display brightness distribution matrix E1 of the display and the matrix C, where the number of rows and columns of the matrix C, the matrix D, and the matrix E1 are equal, the number of each element in the matrix E1 is equal, and the number obtained by sequentially dividing each element in the matrix E1 by the element at the corresponding position in the matrix C is the number of the element at the corresponding position in the matrix D;
and the driving module controls the output power of each light-emitting unit in the backlight source according to the matrix D.
8. The method of claim 7, wherein the number of rows and columns of the matrix B is equal to the number of rows and columns of the light-emitting units of the backlight, each light-emitting unit of the backlight corresponds to an element in one of the matrices B, and the output power of the corresponding light-emitting unit of one of the backlights is controlled according to the element in one of the matrices D.
9. The method of claim 7, wherein a standard backlight source with uniform light emission is used for emitting light from the light incident surface of the display panel, and the matrix A is obtained by detecting a brightness distribution matrix of the light emergent surface of the display panel.
10. The method according to claim 9, wherein the light-emitting surface of the display panel is divided into j × k regions with equal size, where j and k are the number of rows and columns of the matrix B, respectively, and the luminance value of each region is detected to obtain the matrix a; or
The light emitting surface of the display panel is provided with m × n pixels, the brightness values of the pixels on the light emitting surface of the display panel are respectively detected, a pixel brightness distribution matrix A1 of the display panel is obtained, the pixel brightness distribution matrix A1 is subjected to matrix blocking and is divided into j × k sub-blocks, the number of elements in each sub-block is equal, j and k are respectively the row number and the column number of the matrix B, and the average value of each element in each sub-block is used as the numerical value of the element of the corresponding position to obtain the matrix A.
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