CN109584811B - Driving method and driving device of backlight source and display equipment - Google Patents
Driving method and driving device of backlight source and display equipment Download PDFInfo
- Publication number
- CN109584811B CN109584811B CN201910002782.5A CN201910002782A CN109584811B CN 109584811 B CN109584811 B CN 109584811B CN 201910002782 A CN201910002782 A CN 201910002782A CN 109584811 B CN109584811 B CN 109584811B
- Authority
- CN
- China
- Prior art keywords
- reference value
- image
- sub
- pixels
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- 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
Abstract
The invention provides a driving method, a driving device and a display device of a backlight source, wherein the driving method comprises the following steps of: acquiring the value of a preset parameter of each pixel in the sub-image according to the image data of the sub-image; the image data is data of a first bit number; determining a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel ratio and the value of a predetermined parameter of each pixel; converting the first reference value into first backlight data with a second bit number, and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits; determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data; and providing a driving signal for the light emitting area according to the target backlight data. The invention can make full use of backlight data to increase the brightness level of the backlight source.
Description
Technical Field
The invention relates to the technical field of display, in particular to a driving method and a driving device of a backlight source and display equipment.
Background
In the field of liquid crystal display, the technique of local backlight adjustment (L annular Dimming) can adjust the brightness of different areas of a backlight source according to the brightness of a display image, thereby improving the contrast of the display image and reducing the power consumption of the backlight.
Generally, the data of the image source is 8 bits (bit), and in order to prevent the flicker phenomenon and improve the image quality fineness, the backlight data can be 12 bits (i.e. the brightness level of the backlight is in the range of 0-2)12-1). However, currently 8 bits of image source data can only be mapped to 2 when determining the brightness level of the backlight122 out of 1 brightness levels8The brightness level causes data waste; and the backlight source still cannot reach 2 substantially12And a brightness level.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides a driving method and a driving device of a backlight source and a display device.
In order to achieve the above object, the present invention provides a driving method of a backlight used in a display device, the backlight including at least one light-emitting area, the driving method including the steps of, for each light-emitting area:
acquiring the value of a preset parameter of each pixel in a sub-image according to the image data of the sub-image corresponding to the light emitting area in the image to be displayed; the image data is data of a first bit number;
determining a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel ratio and the value of a predetermined parameter of each pixel; the first proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the first reference value to the total number of pixels of the sub-image; the second proportion is as follows: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the second reference value to the total number of pixels of the sub-image; when the values of the predetermined parameters of the pixels in the sub-image are not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of the pixels of which the values are smaller than the second reference value and larger than the first reference value is zero;
converting the first reference value into first backlight data with a second bit number, and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits;
determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data;
and providing a driving signal for the light emitting area according to the target backlight data.
Optionally, in the step of determining the first reference value, the second reference value, the first proportion and the second proportion according to the effective pixel ratio and the value of the predetermined parameter of each pixel, when the values of the predetermined parameter of each pixel in the sub-image are all equal, the first reference value is equal to the second reference value.
Optionally, when the values of the predetermined parameter of the pixels in the sub-image are not completely equal, the target backlight data is calculated according to the following formula:
wherein a is the first ratio; b is the second ratio; c is the effective pixel ratio; gray is the target backlight data; gray1 is the first backlight data, and Gray2 is the second backlight data.
Optionally, the predetermined parameter is brightness, and the value of the predetermined parameter of the pixel is a maximum value of each color component of the pixel.
Optionally, the number of pixels of which the value of the predetermined parameter is equal to the first reference value is greater than zero; the effective pixel proportion is between 99.0% and 99.9%.
Correspondingly, the present invention further provides a driving apparatus of a backlight source, the backlight source is used in a display device, the backlight source includes at least one light emitting area, the driving apparatus includes:
the pixel information acquisition module is used for acquiring the value of the preset parameter of each pixel in the sub-image according to the image data of the sub-image corresponding to the light emitting area in the image to be displayed; the image data is data of a first bit number;
the reference value acquisition module is used for determining a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel ratio and the value of a preset parameter of each pixel; the first proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the first reference value to the total number of pixels of the sub-image; the second proportion is as follows: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the second reference value to the total number of pixels of the sub-image; when the values of the predetermined parameters of the pixels in the sub-image are not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of the pixels of which the values are smaller than the second reference value and larger than the first reference value is zero;
the data conversion module is used for converting the first reference value into first backlight data with a second bit number and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits;
the target data determining module is used for determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data;
and the driving module is used for providing a driving signal for the light emitting area according to the target backlight data.
Optionally, the reference value obtaining module is further configured to set the first reference value and the second reference value to equal values when the values of the predetermined parameter of each pixel in the sub-image are all equal.
Optionally, the target data determining module is configured to calculate the target backlight data according to the following formula when the values of the predetermined parameters of the pixels in the sub-image are not completely equal to each other:
wherein a is the first ratio; b is the second ratio; c is the effective pixel ratio; gray is the target backlight data; gray1 is the first backlight data, and Gray2 is the second backlight data.
Optionally, the predetermined parameter is brightness, and the pixel information obtaining module includes:
a color component acquisition unit configured to acquire each color component of each pixel from the image data;
and a brightness calculation unit for taking the maximum value of each color component of the pixel as the brightness of the pixel.
Optionally, the number of pixels of which the value of the predetermined parameter is equal to the first reference value is greater than zero; the effective pixel proportion is between 99.0% and 99.9%.
Correspondingly, the invention also provides a display device which comprises a backlight source and a driving device of the backlight source.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart illustrating a driving step of a light emitting area in a driving method of a backlight according to an embodiment of the present invention;
fig. 2 is a flowchart of a driving step for a light emitting area in a backlight driving method according to a second embodiment of the present invention;
FIG. 3 is a graph of a relationship between a scale and backlight data determined according to a first scale, a second scale, first backlight data and second backlight data;
fig. 4 is a schematic diagram of a driving device of a backlight according to a third embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be understood that the image data in the present invention is data related to information of each pixel in an image, the backlight data is data related to a backlight brightness level, and when the image data is binary data of m bits (bit), a gray scale or each color component of the pixel is 0 to 2m-1; when the backlight data is n-bit binary data, the brightness level of the backlight source is 0-2n-1.
At present, 8-bit data is adopted for image data, 12-bit data can be adopted for backlight data, and when the brightness level of the luminous zone is determined according to the 8-bit image data, one common method is a histogram statistical method, specifically, the maximum gray scale of an effective pixel in an image part corresponding to the luminous zone is calculated by the histogram statistical method, wherein the effective pixel is a pixel except a noise pixelThe mapping (usually shifting the data) converts the resulting maximum gray level to a backlight level. The gray scale data is 8-bit data with a value number of 28That is to say, can only correspond to 2122 of one brightness level8A brightness level such that 2 cannot be fully utilized12The backlight data of (2) causes data waste. And, at this time, the backlight source still reaches 2 substantially8The brightness level of the backlight source is not fine enough due to the individual brightness level, and the problems of the flicker phenomenon and low dynamic contrast of the displayed image still exist.
The embodiment of the invention provides a driving method of a backlight source, wherein the backlight source is used in display equipment and provides backlight for a display panel of the display equipment. Wherein the backlight comprises at least one light emitting area. The images to be displayed of the display device each include sub-images in one-to-one correspondence with the light emitting areas.
Fig. 1 is a flowchart of a driving method for a light emitting region in a backlight provided in an embodiment of the present invention, and as shown in fig. 1, the driving method for a backlight includes:
s11, acquiring the value of the preset parameter of each pixel in the sub-image according to the image data of the sub-image corresponding to the light emitting area in the image to be displayed; the image data is data of a first number of bits.
Wherein the sub-image comprises a plurality of pixels. When the sub-image is a color image, the image data of the sub-image includes color components of respective colors of each pixel; i.e., the R, G, and B values for each pixel. When the sub-image is a gray scale image, the image data of the sub-image includes gray scale information of each pixel. Wherein the image data is m bits, that is, when the sub-image is a color image, the color component of each color of each pixel is 0-2m-an integer between 1; when the sub-image is a gray image, the gray scale of each pixel is 0-2m-an integer between 1.
The predetermined parameter may be a brightness, or the like. Taking the predetermined parameter as lightness as an example, when the image data is m bits, the lightness data of each pixel is also m bits of data.
And S12, determining a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel proportion in the sub-image and the value of the predetermined parameter of each pixel. Wherein the first proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the first reference value to the total number of pixels of the sub-image; the second proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the second reference value to the total number of pixels of the sub-image; and when the values of the predetermined parameters of the pixels in the sub-images are not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of the pixels of which the values are smaller than the second reference value and larger than the first reference value is zero.
The effective pixel occupation ratio is the proportion of effective pixels except for the noise image pixels in the sub-image, and the proportion can be preset according to experimental statistical data. Typically, the effective pixel fraction is between 99% and 99.9%. For example, in the embodiment of the present invention, 0.3% of the pixels in each sub-image are considered as noise pixels, and in this case, the effective pixel ratio is 99.7%.
S13, converting the first reference value into second backlight data with a second bit number, and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits.
The second bit number is related to the brightness level of the backlight source, and when the second bit number is n, the brightness level range of the backlight source is 0-2n-1. It is understood that, when the image data is m-bit data, the value of the predetermined parameter of the pixel, the first reference value, and the second reference value are m-bit binary data; at this time, the first backlight data is obtained by shifting the binary data corresponding to the first reference value by n-m bits to the left, and the second backlight data is obtained by shifting the binary data corresponding to the second reference value by n-m bits to the left.
And S14, determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data. That is, based on the first ratio, the second ratio, the first backlight data, and the second backlight data, a relationship curve between the ratio value and the backlight data value can be obtained, and the target backlight data corresponding to the effective pixel ratio can be obtained based on the relationship curve.
S15, providing a driving signal to the light-emitting region according to the target backlight data to make the light-emitting region reach a brightness level corresponding to the target backlight data.
Compared with the prior art, in the first embodiment of the present invention, when determining the backlight data with the second bit number according to the image data with the first bit number, the backlight data is not directly obtained by shift conversion of the maximum brightness in the effective pixel, but a first ratio a and a second ratio b close to the ratio c of the effective pixel, and the backlight data corresponding to the ratios a and b are obtained first (assuming that the predetermined parameter is brightness, the backlight data corresponding to a and b are respectively data in which the maximum brightness in the pixel with the ratio a is converted from the first bit number to the second bit number, and the maximum brightness in the pixel with the ratio b is converted from the first bit number to the second bit number); and then acquiring target backlight data corresponding to the effective pixel ratio c according to the two ratios a and b and the backlight data corresponding to the two ratios a and b. It is equivalent to obtaining the target backlight data between the two backlight data with the second bit number by means of interpolation. Therefore, the target backlight data is not only related to the maximum brightness in the effective pixels, but also related to two proportions close to c, so that even if the first reference value and the second reference value of the effective pixels in the two sub-images are equal, the first proportion a and the second proportion b of the two sub-images are not necessarily the same, the target backlight data corresponding to the two sub-images are respectively two different values between the first backlight data corresponding to the first reference value and the second backlight data corresponding to the second reference value, and the backlight brightness can reach more levels on the basis of combining image content, so that the problem of display flicker is prevented, the displayed image has higher dynamic contrast, and the detailed information is more exquisite and rich.
Fig. 2 is a flowchart of a driving step for a light emitting area in a backlight driving method according to a second embodiment of the present invention, where the driving step of the second embodiment is specific to the driving step of the first embodiment, and in the driving method of the second embodiment, the predetermined parameter is brightness. As shown in fig. 2, the driving step for each light emitting region includes S21 to S26:
and S21, acquiring image data of a sub-image corresponding to the light emitting area in the image to be displayed of the display device, wherein the image data is data of a first bit number. The image data includes each color channel value of each pixel.
S22, a brightness value of each pixel in the sub-image is obtained from the image data. Specifically, the brightness value of the pixel is the maximum value of each color component of the pixel.
S23, determining a first reference value, a second reference value, a first proportion and a second proportion. The first ratio is: the ratio of the number of pixels in the sub-image whose brightness does not exceed the first reference value to the total number of pixels in the sub-image; the second proportion is: the ratio of the number of pixels in the sub-image whose brightness does not exceed the second reference value to the total number of pixels in the sub-image. The number of pixels with brightness equal to the first reference value is greater than zero; when the brightness of each pixel in the sub-image is not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of pixels with brightness smaller than the second reference value and larger than the first reference value is zero. When the brightness of each pixel in the sub-image is all equal, the first proportion is equal to the second proportion, and the first reference value is equal to the second reference value; the first reference value and the second reference value are both equal to the brightness of each pixel.
Wherein, the effective pixel accounts for 99.0-99.9%, specifically 99.7%. In addition, when different light emitting areas are driven, the same effective pixel ratio can be used for convenience of calculation.
Step S23 specifically includes S231 to S233:
s231, judging whether the brightness of each pixel in the sub-image is equal, if so, performing the step S232; otherwise, step S233 is performed.
And S232, setting the first reference value and the second reference value as brightness of each pixel.
S233, calculating a first proportion, a second proportion, a first reference value and a second reference value according to S233 a-S233 c.
S233a, the set reference value gray is 0.
S233b, calculating a ratio hist (gray) of the number of pixels in the sub-display area whose brightness does not exceed the reference value gray to the total number of pixels of the sub-image according to the following formula:
wherein V is more than or equal to 0 and less than or equal to 2m-1; m is a first number of bits; num (V) is the number of pixels with brightness equal to V; sum is the total number of pixels in the subimage.
S233c, determining whether the ratio of hist (gray) is less than the effective pixel ratio c, if yes, updating the value of gray: gray +1, and returns to step S233 b; if not, taking the current value of the gray as a second reference value, and taking the gray-x as a first reference value; taking the ratio of the number of pixels with brightness not exceeding a first reference value to the total number of pixels of the sub-image as a first ratio a; the ratio of the number of pixels whose brightness does not exceed the second reference value to the total number of pixels of the sub-image is taken as a second ratio b. Wherein x is a positive integer, and the number of pixels with lightness gray-x in the sub-image is greater than zero; and the lightness of none of the pixels in the sub-image is greater than gray-x and less than gray. For example, if the effective pixel ratio c is 99.7%, the Hist (100) is Hist (101) is Hist (102) is 99.2%, and the Hist (103) is 99.7%, the first reference value is 100, the second reference value is 103, the first ratio is 99.2%, and the second ratio is 99.7%.
S24, converting the first reference value into second backlight data with a second bit number, and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits. Assuming that the first number of bits is m and the second number of bits is n, the step S24 specifically includes: shifting the binary data with m bit number corresponding to the first reference value by n-m bits to the left to obtain first backlight data; and shifting the binary data with n bit numbers corresponding to the second reference value by n-m bits to the left to obtain second backlight data.
And S25, determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data. That is, a relation curve between the ratio and the backlight data is determined according to the first ratio, the second ratio, the first backlight data and the second backlight data, as shown in fig. 3, where a is the first ratio, b is the second ratio, and c is the effective pixel ratio; gray1 is the first backlight data, and Gray2 is the second backlight data; and then determining target backlight data corresponding to the effective pixel ratio according to the relation curve.
Step S25 specifically includes: calculating target backlight data Gray according to the following formula:
it should be noted that the target backlight data Gray calculated according to the above formula is an integer, that is, when the calculation result on the right side of the formula is a decimal value, the decimal value is rounded to obtain Gray.
And S26, providing a driving signal for the luminous zone according to the target backlight data, so that the backlight source reaches the brightness level corresponding to the target backlight data.
The following compares the driving method of the backlight provided by the present invention with the driving method of the backlight in the prior art with reference to examples. The image data is 8-bit data, the backlight data is 12-bit data, and the effective pixel ratio c is equal to 99.7%. When the driving method of the related art is adopted, the data of 8 bits is directly converted into the backlight data of 12 bits, and then the luminance level of the backlight is an integral multiple of 0, 16, 32, 48, etc. 16. When the driving method of the present invention is used to determine the target backlight data, it is assumed that: the ratio of the number of pixels with brightness not exceeding 200 in the first sub-image to the total number of pixels in the sub-image is 99%, and the ratio of the number of pixels with brightness not exceeding 201 to the total number of pixels in the sub-image is 99.8%; the ratio of the number of pixels in the second sub-image having brightness of no more than 200 to the total number of pixels in the sub-image is 95%, and the ratio of the number of pixels having brightness of no more than 201 to the total number of pixels in the sub-image is 99.8%; then, the value of the target backlight data corresponding to the first sub-image is:
the value of the target backlight data corresponding to the second sub-image is:
therefore, the backlight data obtained by the invention is not only integral multiples of 16, so that more brightness levels are achieved, the brightness division of the backlight source can be more exquisite, the flicker caused by too few brightness levels of the backlight source can be prevented, the dynamic contrast of the displayed image is improved, and the detail information of the image is more exquisite.
Fig. 4 is a schematic view of a driving apparatus of a backlight according to a third embodiment of the present invention, where the backlight includes at least one light emitting area. As shown in fig. 4, the driving apparatus of the backlight includes: a pixel information acquisition module 10, a reference value acquisition module 20, a data conversion module 30, a target data determination module 40, and a driving module 50.
The pixel information obtaining module 10 is configured to obtain a value of a predetermined parameter of each pixel in a sub-image according to image data of the sub-image corresponding to the light emitting area in the image to be displayed; the image data is data of a first number of bits.
The reference value obtaining module 20 is configured to determine a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel ratio and the value of the predetermined parameter of each pixel. The first ratio is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the first reference value to the total number of pixels of the sub-image; the second proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the second reference value to the total number of pixels of the sub-image. And when the values of the predetermined parameters of the pixels in the sub-images are not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of the pixels of which the values are smaller than the second reference value and larger than the first reference value is zero. The reference value acquisition module determines the first reference value and the second reference value as the same value when the values of the predetermined parameters of the pixels in the sub-images are all equal.
The data conversion module 30 is configured to convert the first reference value into first backlight data with a second bit number, and convert the second reference value into second backlight data with the second bit number. The second number of bits is greater than the first number of bits.
The target data determining module 40 is configured to determine target backlight data with a second bit number corresponding to the effective pixel fraction according to a corresponding relationship between the first ratio and the first backlight data and a corresponding relationship between the second ratio and the second backlight data.
The driving module 50 is used for providing a driving signal for the light emitting area according to the target backlight data.
Wherein, the effective pixel proportion is between 99.0% and 99.9%, and specifically can be 99.7%.
The predetermined parameter is brightness, and the pixel information acquisition module 10 includes a color component acquisition unit 11 and a brightness calculation unit 12. The color component acquisition unit 11 is configured to acquire color components of each pixel (i.e., an R value, a G value, and a B value in each pixel) from image data. The brightness calculation unit 12 is configured to take the maximum value of each color component of a pixel as the brightness of the pixel.
The target data determining module 40 is specifically configured to, when the values of the predetermined parameter of the pixels in the sub-image are not completely equal (i.e., the first reference value is not equal to the second reference value, and the first ratio is not equal to the second ratio), calculate the target backlight data according to the following formula:
wherein a is a first reference ratio; b is a second reference ratio; c is the effective pixel ratio; gray is target backlight data; gray1 is the first backlight data and Gray2 is the second backlight data.
When the values of the predetermined parameters of the pixels in the sub-image are all equal, the first reference value is equal to the second reference value, the first ratio is equal to the second ratio, and the target data determining module 40 may directly use the first backlight data or the second backlight data as the target backlight data.
The principle and process of obtaining the target backlight data by the image data are described above and will not be described herein.
The driving device of the backlight source provided by the third embodiment of the invention can drive the light emitting area of the backlight source by combining the content of the image to be displayed, and the light emitting area can reach more brightness levels than the gray scale level of the displayed image.
The fourth embodiment of the present invention further provides a display device, which includes a backlight, a display panel disposed on the light exit side of the backlight, and the driving apparatus of the backlight in the third embodiment.
The backlight source comprises a plurality of light emitting areas, and the display panel comprises a plurality of display areas which correspond to the light emitting areas one to one. Assuming that the screen resolution of the display panel is W × H and the backlight includes M × N light emitting areas, each display area includes (W/M) × (H/N) pixels.
The driving device of the backlight source can drive the light emitting area of the backlight source by combining the content of the image to be displayed and enable the light emitting area to reach more brightness levels than the gray scale level of the displayed image, so that the flicker of the display equipment caused by less backlight brightness levels can be reduced, the dynamic contrast of the displayed image is improved, and the detailed information of the image is more exquisite and rich.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A method of driving a backlight for use in a display device, the backlight comprising at least one light-emitting area, the method comprising, for each light-emitting area:
acquiring the value of a preset parameter of each pixel in a sub-image according to the image data of the sub-image corresponding to the light emitting area in the image to be displayed; the image data is data of a first bit number;
determining a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel ratio and the value of a predetermined parameter of each pixel; the first proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the first reference value to the total number of pixels of the sub-image; the second proportion is as follows: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the second reference value to the total number of pixels of the sub-image; when the values of the predetermined parameters of the pixels in the sub-image are not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of the pixels of which the values are smaller than the second reference value and larger than the first reference value is zero;
converting the first reference value into first backlight data with a second bit number, and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits;
determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data;
providing a driving signal for the light emitting area according to the target backlight data;
wherein the predetermined parameter comprises a brightness, the first reference value and the second reference value are obtained by:
judging whether the brightness of each pixel in the sub-image is equal, if so, setting the first reference value and the second reference value as the brightness of each pixel; otherwise, calculating the first reference value and the second reference value according to the steps a, b and c:
step a, setting a reference value gray to be 0;
b, calculating the ratio Hist (gray) of the number of pixels with brightness not exceeding gray to the total number of pixels of the sub-image in the sub-display area according to the following formula:
wherein V is more than or equal to 0 and less than or equal to 2m-1; m is a first number of bits; num (V) is the number of pixels with brightness equal to V; sum is the total number of pixels of the subimage;
step c, judging whether the hit (gray) is smaller than the effective pixel proportion, if so, updating the value of gray: g, gray +1, and returning to the step b; if not, taking the current value of the gray as the second reference value, and taking the gray-x as the first reference value;
wherein x is a positive integer, and the number of pixels with lightness gray-x in the sub-image is greater than zero; and pixels whose lightness is greater than gray-x and less than gray are not present in the sub-image.
2. The driving method according to claim 1, wherein when the values of the predetermined parameters of the pixels in the sub-image are not completely equal, the target backlight data is calculated according to the following formula:
wherein a is the first ratio; b is the second ratio; c is the effective pixel ratio; gray is the target backlight data; gray1 is the first backlight data, and Gray2 is the second backlight data.
3. The driving method according to any one of claims 1 to 2, wherein the predetermined parameter is brightness, and the value of the predetermined parameter of the pixel is a maximum value of each color component of the pixel.
4. The driving method according to any one of claims 1 to 2, wherein the number of pixels having a value of the predetermined parameter equal to the first reference value is greater than zero;
the effective pixel proportion is between 99.0% and 99.9%.
5. A driving apparatus for a backlight used in a display device, the backlight including at least one light-emitting region, the driving apparatus comprising:
the pixel information acquisition module is used for acquiring the value of the preset parameter of each pixel in the sub-image according to the image data of the sub-image corresponding to the light emitting area in the image to be displayed; the image data is data of a first bit number;
the reference value acquisition module is used for determining a first reference value, a second reference value, a first proportion and a second proportion according to the effective pixel ratio and the value of a preset parameter of each pixel; the first proportion is: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the first reference value to the total number of pixels of the sub-image; the second proportion is as follows: the value of the predetermined parameter in the sub-image does not exceed the ratio of the number of pixels of the second reference value to the total number of pixels of the sub-image; when the values of the predetermined parameters of the pixels in the sub-image are not completely equal, the first ratio is smaller than the effective pixel ratio, the second ratio is larger than or equal to the effective pixel ratio, and the number of the pixels of which the values are smaller than the second reference value and larger than the first reference value is zero;
the data conversion module is used for converting the first reference value into first backlight data with a second bit number and converting the second reference value into second backlight data with the second bit number; the second number of bits is greater than the first number of bits;
the target data determining module is used for determining target backlight data with a second bit number corresponding to the effective pixel ratio according to the corresponding relation between the first proportion and the first backlight data and the corresponding relation between the second proportion and the second backlight data;
the driving module is used for providing a driving signal for the light emitting area according to the target backlight data;
wherein the predetermined parameter comprises a brightness, the first reference value and the second reference value are obtained by:
judging whether the brightness of each pixel in the sub-image is equal, if so, setting the first reference value and the second reference value as the brightness of each pixel; otherwise, calculating the first reference value and the second reference value according to the steps a, b and c:
step a, setting a reference value gray to be 0;
b, calculating the ratio Hist (gray) of the number of pixels with brightness not exceeding gray to the total number of pixels of the sub-image in the sub-display area according to the following formula:
wherein V is more than or equal to 0 and less than or equal to 2m-1; m is a first number of bits; num (V) is the number of pixels with brightness equal to V; sum is the total number of pixels of the subimage;
step c, judging whether the hit (gray) is smaller than the effective pixel proportion, if so, updating the value of gray: g, gray +1, and returning to the step b; if not, taking the current value of the gray as the second reference value, and taking the gray-x as the first reference value;
wherein x is a positive integer, and the number of pixels with lightness gray-x in the sub-image is greater than zero; and pixels whose lightness is greater than gray-x and less than gray are not present in the sub-image.
6. The driving apparatus according to claim 5, wherein the target data determining module is configured to calculate the target backlight data according to the following formula when the values of the predetermined parameters of the pixels in the sub-image are not completely equal to each other:
wherein a is the first ratio; b is the second ratio; c is the effective pixel ratio; gray is the target backlight data; gray1 is the first backlight data, and Gray2 is the second backlight data.
7. The driving apparatus according to any one of claims 5 to 6, wherein the predetermined parameter is brightness, and the pixel information acquisition module includes:
a color component acquisition unit configured to acquire each color component of each pixel from the image data;
and a brightness calculation unit for taking the maximum value of each color component of the pixel as the brightness of the pixel.
8. The driving device according to any one of claims 5 to 6, wherein the number of pixels having a value of the predetermined parameter equal to the first reference value is greater than zero; the effective pixel proportion is between 99.0% and 99.9%.
9. A display device characterized by comprising a backlight and a driving device of the backlight according to any one of claims 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910002782.5A CN109584811B (en) | 2019-01-02 | 2019-01-02 | Driving method and driving device of backlight source and display equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910002782.5A CN109584811B (en) | 2019-01-02 | 2019-01-02 | Driving method and driving device of backlight source and display equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109584811A CN109584811A (en) | 2019-04-05 |
| CN109584811B true CN109584811B (en) | 2020-07-24 |
Family
ID=65915795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910002782.5A Active CN109584811B (en) | 2019-01-02 | 2019-01-02 | Driving method and driving device of backlight source and display equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109584811B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111415630B (en) * | 2020-04-28 | 2022-02-22 | Tcl华星光电技术有限公司 | Display device driving method and display device |
| CN114153413B (en) * | 2021-11-09 | 2024-02-09 | 深圳曦华科技有限公司 | Image conversion method and device and bridge chip |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049614A (en) * | 2005-06-09 | 2015-11-11 | 三星电子株式会社 | Portable terminal capable of controlling backlight and corresponding method |
| CN107146581A (en) * | 2017-04-07 | 2017-09-08 | 广东欧珀移动通信有限公司 | Adjust method, mobile terminal and the storage medium of backlight illumination grade |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4203081B2 (en) * | 2006-05-19 | 2008-12-24 | 株式会社東芝 | Image display device and image display method |
| US8345038B2 (en) * | 2007-10-30 | 2013-01-01 | Sharp Laboratories Of America, Inc. | Methods and systems for backlight modulation and brightness preservation |
| CN101281730A (en) * | 2008-03-20 | 2008-10-08 | 青岛海信电器股份有限公司 | Liquid crystal display method |
| US20090251400A1 (en) * | 2008-04-02 | 2009-10-08 | Hisense Beiging Electric Co., Ltd. | Lcd display method |
| JP2015038522A (en) * | 2009-09-10 | 2015-02-26 | 株式会社東芝 | Video display device and backlight control method |
| KR101295882B1 (en) * | 2009-11-30 | 2013-08-12 | 엘지디스플레이 주식회사 | Liquid crystal display and local dimming control method of thereof |
| TWI517126B (en) * | 2009-12-16 | 2016-01-11 | 杜比實驗室特許公司 | Method and system for backlight control using statistical attributes of image data blocks |
| US8547407B2 (en) * | 2010-10-05 | 2013-10-01 | Synaptics Incorporated | Backlight control method and apparatus for high brightness contrast images |
| CN102568386B (en) * | 2010-12-29 | 2015-08-19 | 上海易维视科技有限公司 | Dynamic backlight local control liquid crystal display and system |
| CN105047140A (en) * | 2015-07-06 | 2015-11-11 | 西安交通大学 | Self-adapting dynamic backlight control system and method based on image content |
| CN108648700B (en) * | 2018-05-18 | 2020-02-18 | 京东方科技集团股份有限公司 | Dynamic dimming display control method and device for backlight source |
-
2019
- 2019-01-02 CN CN201910002782.5A patent/CN109584811B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049614A (en) * | 2005-06-09 | 2015-11-11 | 三星电子株式会社 | Portable terminal capable of controlling backlight and corresponding method |
| CN107146581A (en) * | 2017-04-07 | 2017-09-08 | 广东欧珀移动通信有限公司 | Adjust method, mobile terminal and the storage medium of backlight illumination grade |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109584811A (en) | 2019-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105448245B (en) | Backlight illumination compensation method and display device | |
| CN111968570B (en) | Display compensation information acquisition method, display compensation method and device | |
| KR102353218B1 (en) | Display apparatus and method for driving thereof | |
| KR102194571B1 (en) | Method of data conversion and data converter | |
| KR101612455B1 (en) | Method of correcting pixel data, and display apparatus for performing the method | |
| US8358293B2 (en) | Method for driving light source blocks, driving unit for performing the method and display apparatus having the driving unit | |
| JP4895547B2 (en) | Method and apparatus for output level control and / or contrast control in a display device | |
| US9349333B2 (en) | Control circuit and display device equipped with the same | |
| JP5270730B2 (en) | Video display device | |
| US20110115826A1 (en) | Image display device | |
| US9196204B2 (en) | Image processing apparatus and image processing method | |
| US20100225574A1 (en) | Image display device and image display method | |
| EP1617658B1 (en) | Enhanced image display | |
| KR101073006B1 (en) | Display device and method for controling brightness of images in display device | |
| WO2019054178A1 (en) | Display device and signal processing device | |
| CN113744684B (en) | Display control method, display control device and display device | |
| JP2009002976A (en) | Display driving circuit | |
| CN109584811B (en) | Driving method and driving device of backlight source and display equipment | |
| KR20150078025A (en) | Method And apparatus Controlling Luminance Of Organic Light Emitting Diode Display Device | |
| JP2013513128A (en) | Display panel pixel brightness control | |
| JP4888695B2 (en) | Display device and display method | |
| US9569999B2 (en) | Signal generation apparatus, signal generation program, signal generation method, and image display apparatus | |
| WO2010150299A1 (en) | Liquid crystal display device | |
| CN111312166B (en) | Display panel compensation method, display panel and display device | |
| CN112581914B (en) | Image processing method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |