CN112505963A - Image enhancement method and system based on liquid crystal display superposition - Google Patents
Image enhancement method and system based on liquid crystal display superposition Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- 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
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- 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
- 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
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- 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
- G09G3/36—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 using liquid crystals
- G09G3/3607—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 using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
The application relates to an image enhancement system based on liquid crystal display superposition, which comprises a display body, wherein a screen sequentially comprises a backlight layer, an equalizing layer, a light modulation layer and a pixel layer from inside to outside; the backlight layer comprises a central backlight plate positioned in the center of the display, an outer frame backlight plate is arranged on the edge of the central backlight plate, and the central backlight plate and the outer frame backlight plate are spliced to form the backlight layer; the opening or closing of the central backlight plate and the outer frame backlight plate is controlled by the processing unit; the application has the following effects: carry out the subregion to LCD display's board in a poor light and set up to central board in a poor light and frame board in a poor light to the distribution area division pixel point in the frame board in a poor light of central board in a poor light distribution pixel layer, opening or closing of board in a poor light and frame board in a poor light to the luminance value distribution condition control central board of pixel point again, close all board in a poor light of control when pure black picture, control frame board in a poor light and close when kind of film picture, reduce the condition that the halo appears in the display, improve user's use comfort.
Description
Technical Field
The present application relates to the field of displays, and in particular, to an image enhancement method and system based on liquid crystal display stacking.
Background
Liquid crystal displays, also called LCD screens, are widely used in electronic products such as tablet computers, televisions or mobile phones.
In the related art, the light emitted by the LCD screen is transmitted from the backlight plate or the backlight layer to the pixel layer, and the amount of light projection is adjusted by controlling the liquid crystal molecule twist of the liquid crystal layer, and the more white light emitted by the backlight plate passes through the pixel layer, the brighter the displayed image is; otherwise, the darker the displayed image.
For the above related technologies, the inventor believes that, because the backlight plate emits light uniformly, under the condition that the brightness difference of the screen display image is large, for example, the brightness emitted by a part of pixel points is large, the brightness emitted by an adjacent part of pixel points is small, and the light emitted by the pixel points with large brightness is projected; the brightness value of the pixel point which should originally display darker brightness is increased due to the decreased brightness of the pixel point, so that halos are displayed at the periphery of the picture area with higher brightness; on the other hand, because the backlight plate uniformly emits light, a small amount of light leakage exists in a gap around the mobile phone in a dark environment, and a halo situation also occurs, and the use experience of a user is affected by the appearance of the two halos.
Disclosure of Invention
In order to improve the halo occurrence condition of the LCD, the application provides an image enhancement method and system based on the superposition of the LCD.
On one hand, the system for enhancing the image based on the superposition of the liquid crystal display adopts the following technical scheme:
a system for enhancing images based on liquid crystal display superposition comprises a display body, wherein the display body comprises a processing unit and a screen, and the screen sequentially comprises a backlight layer, an equalizing layer, a light modulation layer and a pixel layer from inside to outside;
the backlight layer is used for transmitting a light source to the pixel layer; the backlight device comprises a rectangular central backlight plate positioned in the center of a display, wherein an outer frame backlight plate in a rectangular frame shape is arranged on the edge of the central backlight plate, and the central backlight plate and the outer frame backlight plate are spliced to form the backlight layer; the opening or closing of the central backlight plate and the outer frame backlight plate is controlled by the processing unit;
the balance layer is used for homogenizing the light emitted by the central backlight plate and the outer frame backlight plate and projecting the light to the light modulation layer;
the light modulation layer comprises a first polarizing film and a second polarizing film which are different in direction, a liquid crystal layer is arranged between the first polarizing film and the second polarizing film, and the liquid crystal layer is controlled by the processing unit;
the pixel layer comprises a plurality of pixel points, and each pixel point comprises three different sub-pixel points of RGB;
the pixel points comprise central pixel points and outer frame pixel points, and the area formed by the central pixel points is the same as the area formed by the central backlight board;
the area formed by the outer frame pixel points is the same as the area formed by the outer frame backlight plate;
the processing unit is used for receiving an input image and driving liquid crystal molecules of the liquid crystal layer to rotate so as to image the input image on the pixel layer;
the backlight control module is further used for obtaining a first brightness value of each central pixel point and a second brightness value of each outer frame pixel point, and controlling the central backlight board and the outer frame backlight board to be turned on or turned off according to the distribution condition of the first brightness values and the distribution condition of the second brightness values.
Through adopting above-mentioned technical scheme, this application carries out the subregion to LCD display's board in a poor light and sets up to central authorities board in a poor light and frame board in a poor light, and the distribution of pixel point in the distribution area division pixel layer of the board in a poor light of frame board in a poor light according to central authorities, again to opening or closing of the board in a poor light of luminance value distribution condition control central authorities board and frame board in a poor light, close to controlling all boards in a poor light when pure black picture, control frame board in a poor light closes when kind of film picture, improve the light leak at display edge, reduce the condition that the halo appears around the display, improve user use comfort.
Optionally, the frame board in a poor light includes first frame board in a poor light and second frame board in a poor light, first frame board in a poor light set up in the outward flange of central authorities board in a poor light, second frame board in a poor light set up in the outward flange of first frame board in a poor light, central authorities board in a poor light, first frame board in a poor light and the concatenation of second frame board in a poor light form the layer in a poor light.
By adopting the technical scheme, the outer frame backlight plate consists of the first outer frame backlight plate and the second outer frame backlight plate with narrower frames, the accuracy of controlling the backlight plate to be lighted in a partition mode is improved, the outer frame backlight plate is suitable for different pictures with black edges, and the picture showing quality is improved.
Optionally, the outer frame pixel points include a first outer frame pixel point and a second outer frame pixel point, an area formed by the first outer frame pixel point corresponds to the first backlight plate, and an area formed by the second outer frame pixel point corresponds to the second backlight plate.
By adopting the technical scheme, the outer frame pixel points correspond to the outer frame backlight plate, the outer frame pixel points comprise the first outer frame pixel points corresponding to the first outer frame backlight plate and the second outer frame pixel points corresponding to the second outer frame backlight plate, the detection precision of the brightness value distribution of the pixel points is improved, the method is suitable for different pictures with black edges, and the picture projection quality is improved.
Optionally, the equalization layer is an atomized glass layer.
By adopting the technical scheme, under the condition that the central backlight plate and the outer frame backlight plate are both lighted, light rays are more uniformly projected through the atomized glass layer, the uniformity of light ray intensity is improved, and the visual comfort level is improved;
under the condition that a picture with a black edge is projected and the outline border backlight is closed, the central backlight provides brightness, light is transmitted to the outline border position from the central position through the atomized glass layer, so that a small amount of light sources are provided for the outline border pixel points, and light sources, such as a bullet screen or subtitles, are provided for the picture which possibly needs to be displayed on the black edge; but because the light is weakened along with the conduction of the atomized glass, the bullet screen or the subtitle on the outer frame can still be displayed while the light leakage of the display is improved.
On the other hand, the method for enhancing the image based on the superposition of the liquid crystal display adopts the following technical scheme:
a method for enhancing images based on liquid crystal display superposition comprises the following steps:
setting a black brightness threshold;
dividing pixel points on the pixel layer according to the positions of the central backlight board and the outer frame backlight board to obtain a central pixel point and an outer frame pixel point, wherein the area formed by the central pixel point is the same as the position of the central backlight board, and the area formed by the outer frame pixel point is the same as the position of the outer frame backlight board;
the processing unit acquires a first brightness value of each central pixel point and a second brightness value of each outer frame pixel point, and judges according to a first brightness value distribution condition and a second brightness value distribution condition:
if the first brightness value of each central pixel point and the second brightness value of each outer frame pixel point are both smaller than or equal to the black brightness threshold, the processing unit judges that the current picture is a pure black picture, and the processing unit controls the central backlight board and the outer frame backlight board to be closed;
when the first brightness value of any central pixel point is greater than the black brightness threshold and the second brightness value of any outer frame pixel point is less than or equal to the black brightness threshold:
if the second brightness value of the alpha-row outer frame pixel points from the edge of the pixel layer to the inside is less than or equal to the black brightness threshold value and the second brightness value of the beta-row outer frame pixel points from the edge of the pixel layer to the inside is less than or equal to the black brightness threshold value, the processing unit judges that the current picture is a similar movie picture, and controls the central backlight board to be opened and the outer frame backlight board to be closed;
wherein the content of the first and second substances,
，
x is the total number of transverse rows of the outer frame pixel point region, and Y is the total number of longitudinal rows of the outer frame pixel point region; and lightening the backlight layer while playing the next frame of picture, and repeating the above stepsAnd (5) carrying out a step.
Through adopting above-mentioned technical scheme, this application carries out the subregion to LCD display's board in a poor light and sets up to central authorities board in a poor light and frame board in a poor light, and the distribution of pixel point in the distribution area division pixel layer of the board in a poor light of frame board in a poor light according to central authorities, again to opening or closing of the board in a poor light of luminance value distribution condition control central authorities board and frame board in a poor light, close to controlling all boards in a poor light when pure black picture, control frame board in a poor light closes when kind of film picture, improve the light leak at display edge, reduce the condition that the halo appears around the display, improve user use comfort.
Optionally, the outer frame pixel points include the outer frame pixel points including a first outer frame pixel point and a second outer frame pixel point; the outer frame backlight plate comprises a first outer frame backlight plate and a second outer frame backlight plate; the area formed by the first outer frame pixel points corresponds to the first backlight plate, and the area formed by the second outer frame pixel points corresponds to the second backlight plate;
the processing unit further comprises the following steps of obtaining the brightness values of the first outer frame pixel points and the second outer frame pixel points: the processing unit obtains the brightness value of the first outer frame pixel point to obtain a third brightness value and obtains the brightness value of the second outer frame pixel point to obtain a fourth brightness value.
By adopting the technical scheme, the outer frame backlight plate consists of a first outer frame backlight plate and a second outer frame backlight plate with narrower frames, and a first outer frame pixel point and a second outer frame pixel point which correspond to the outer frame pixel point are formed; the method improves the precision of controlling the regional lighting of the backlight plate, is suitable for different pictures with black edges, and improves the picture projection quality.
Optionally, the processing unit obtains a first brightness value of each central pixel point, a third brightness value of each first outer frame pixel point, and a fourth brightness value of each second outer frame pixel point, and determines and controls the central backlight panel, the first outer frame backlight panel, and the second outer frame backlight panel to be turned on or turned off according to a first brightness value distribution condition, the second brightness value, and the fourth brightness value distribution condition.
By adopting the technical scheme, the outer frame pixel points correspond to the outer frame backlight plate, the outer frame pixel points comprise the first outer frame pixel points corresponding to the first outer frame backlight plate and the second outer frame pixel points corresponding to the second outer frame backlight plate, the detection precision of the brightness value distribution of the pixel points is improved, the method is suitable for different pictures with black edges, and the picture projection quality is improved.
Optionally, the movie-like picture refers to a black border existing in a current display presentation picture.
By adopting the technical scheme, the outer frame backlight plate is controlled to be closed under the condition of a similar film picture so as to improve the problem of light leakage at the edge of the LCD screen.
In summary, the present application includes at least one of the following beneficial technical effects:
1. this application carries out the subregion to LCD display's board in a poor light and sets up to central authorities board in a poor light and frame board in a poor light to the distribution area of the board in a poor light of frame board in a poor light of central authorities divides the distribution of pixel point in the pixel layer, opening or closing of board in a poor light of central authorities board in a poor light and frame board in a poor light to the luminance value distribution condition control of pixel point again, close to controlling all board in a poor light when pure black picture, control frame board in a poor light is closed when kind film picture, reduce the condition that the halo appears in the display, improve user comfort in use.
2. Under the condition that the central backlight plate and the outer frame backlight plate are both lighted, light rays are more uniformly projected through the atomized glass layer, the uniformity of light ray intensity is improved, and the visual comfort level is improved;
under the condition that a picture with a black edge is projected and the outline border backlight is closed, the central backlight provides brightness, light is transmitted to the outline border position from the central position through the atomized glass layer, so that a small amount of light sources are provided for the outline border pixel points, and light sources, such as a bullet screen or subtitles, are provided for the picture which possibly needs to be displayed on the black edge; but because the light is weakened along with the conduction of the atomized glass, the bullet screen or the subtitle on the outer frame can still be displayed while the light leakage of the display is improved.
3. Light is conducted to the frame position from central point through the balancing layer, prolongs the propagation range of light, reflects and refracts the dispersion and propagates light on the great pixel of luminance through the balancing layer, reduces the influence of high luminance pixel to low luminance pixel to reduce the halo that appears around the higher picture of luminance, improve visual comfort.
Drawings
Fig. 1 is a schematic screen diagram of an image enhancement system based on liquid crystal display overlay according to the present application.
FIG. 2 is a schematic diagram of a backlight layer of an image enhancement system based on LCD overlay as described herein.
FIG. 3 is a schematic diagram of a pixel layer of an image enhancement system based on LCD overlay according to the present application.
Fig. 4 is a flowchart of an image enhancement method based on lcd overlay according to the present application.
Reference numerals: 100. a display body; 200. a screen; 300. a backlight layer; 301. a central backlight panel; 302. an outer frame backlight plate; 303. a first outer frame backlight plate; 304. a second outer frame backlight plate; 400. an equalization layer; 500. a light modulation layer; 501. a first polarizing film; 502. a liquid crystal layer; 503. a second polarizing film; 600. a pixel layer; 601. a central pixel point; 602. outer frame pixel points; 603. a first outer frame pixel point; 604. a second frame pixel point.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
Example 1:
the embodiment of the application discloses a system for enhancing images based on liquid crystal display superposition.
As shown in fig. 1, the display device includes a display body 100, the display body 100 including a processing unit and a screen 200; the screen 200 includes, from the inside to the outside, a backlight layer 300, an equalizing layer 400, a light modulation layer 500, and a pixel layer 600.
As shown in fig. 2, the backlight layer 300 is disposed on the bottom layer of the screen 200, the backlight layer 300 serves as a light source for transmitting light to the pixel layer 600, the backlight layer 300 includes a central backlight plate 301 and an outer frame backlight plate 302, the central backlight plate 301 is rectangular and disposed at the center of the screen 200, and the outer frame backlight plate 302 is disposed at the outer edge of the central backlight plate 301 and has a rectangular frame shape.
The outer frame backlight plate 302 includes a first outer frame backlight plate 303 disposed on an outer edge of the central backlight plate 301 and a second outer frame backlight plate 304 disposed on an outer edge of the first outer frame backlight plate 303, and the central backlight plate 301, the first outer frame backlight plate 303, and the second outer frame backlight plate 304 are closely spliced to form the backlight layer 300.
The central backlight 301, the first outer frame backlight 303 and the second outer frame backlight 304 are controlled by the processing unit to be turned on or off.
In this embodiment, the backlight plate is a light emitting device, such as a light emitting diode, and the light emitting diodes are uniformly arranged in an array on the central backlight plate 301, the first outer frame backlight plate 303, and the second outer frame backlight plate 304.
As shown in fig. 1, the equalizing layer 400 is an atomized glass layer, the area of the atomized glass layer is equal to the sum of the areas of the central backlight 301, the first outer frame backlight 303 and the second outer frame backlight 304, and the thickness of the atomized glass layer is between 0.3 and 0.cm, so as to homogenize the light transmitted by the central backlight 301, the first outer frame backlight 303 and the second outer frame backlight 304, and meanwhile, under the condition that the outer frame backlight 302 is controlled to be turned off, the light on the central backlight 301 can be transmitted to the backlight 302 through the atomized glass layer to display partial images, such as pop-ups or subtitles, on the pixel points of the outer frame 602.
As shown in fig. 1, the light modulation layer 500 includes a first polarizing film 501 and a second polarizing film 503 disposed on the equalizing layer 400, a filtering direction of the first polarizing film 501 is perpendicular to a transmission axis direction of the second polarizing film 503, a liquid crystal layer 502 is disposed between the first polarizing film 501 and the second polarizing film 503, the liquid crystal layer 502 is controlled by a processing unit, when the processing unit applies a voltage to the liquid crystal, liquid crystal molecules are twisted, and different voltage values determine a twisting degree of the liquid crystal molecules, so that an amount of light passing through the liquid crystal layer 502 can be controlled, and controlling and adjusting an amount of light transmission to the liquid crystal is a conventional technical means in the art, and will not be described in detail in this embodiment.
As shown in fig. 3, the pixel layer 600 includes a plurality of pixel points, each pixel point includes three different sub-pixel points of RGB, and different colors can be obtained by adjusting and fusing the amount of light reaching R, G, B. The distribution area of the pixels is the same as that of the backlight layer 300, the pixels include a central pixel 601 and an outer frame pixel 602, the distribution area of the central pixel 601 corresponds to the position of the central backlight plate 301, the outer edge of the central pixel 601 is provided with the outer frame pixel 602, and the distribution area of the outer frame pixel 602 corresponds to the position of the outer frame backlight plate 302.
The outline border pixel points 602 include a first outline border pixel point 603 and a second outline border pixel point 604, the first outline border pixel point 603 is distributed on the outer edge of the central pixel point 601, the distribution position is the same as the position of the first outline border backlight board 303, and the position of the second outline border pixel point 604 is the same as the position of the second outline border backlight board 304. The longitudinal width of the frame backlight plate can be 0, and correspondingly, the longitudinal width of the frame pixel point coverage range is also 0 correspondingly.
The processing unit receives input image data, applies different voltages to the liquid crystal layer 502 to image an image on the pixel layer 600, and obtains the brightness value of each pixel point, and the processing unit can calculate the brightness value of each pixel point through the voltage applied to the liquid crystal layer 502 corresponding to each sub-pixel point.
The processing unit sets a black brightness threshold value, wherein the black brightness threshold value means that a picture is displayed when the brightness of the pixel point is greater than the black brightness threshold value, and black is displayed when the brightness of the pixel point is less than or equal to the black brightness threshold value.
The processing unit obtains the brightness value of each pixel point to obtain a first brightness value of the central pixel point 601, a third brightness value of the first outer frame pixel point 603 and a fourth brightness value of the second outer frame pixel point 604, and the processing unit controls the central backlight 301, the first outer frame backlight 303 and the second outer frame backlight 304 to be turned on or turned off according to the distribution conditions of the first brightness value, the second brightness value and the third brightness value.
The processing unit is also used to control the backlight layer 300 to be turned on at the same time as the start of each frame of picture.
The processing unit realizes the control through a logic execution unit, and can adopt processing chips with data processing and control capabilities, such as a CPU, an MCU or an FPGA.
The implementation principle of the system for enhancing the image based on the superposition of the liquid crystal display is as follows:
the backlight board is divided into a central backlight board 301, a first outer frame backlight board 303 and a second outer frame backlight board 304, the processing unit obtains the brightness value of each pixel point to be compared with a preset black brightness threshold value, the brightness value distribution conditions of the central pixel point 601, the first outer frame pixel point 603 and the second outer frame pixel point 604 are analyzed, and the central backlight board 301, the first outer frame backlight board 303 and the second outer frame backlight board 304 are controlled to be opened or closed.
Example 2:
the present embodiment is different from embodiment 1 only in that the backlight layer 300 includes a central backlight 301 and an outer frame backlight 302, the central backlight 301 is rectangular and disposed at the center of the screen 200, and the outer frame backlight 302 is disposed at the outer edge of the central backlight 301. The central backlight plate 301 and the outer frame backlight plate 302 are closely spliced to form the backlight layer 300. The opening or closing of the central backlight 301 and the outer frame backlight 302 is controlled by the processing unit.
Correspondingly, the pixel layer 600 includes a plurality of pixel points, each pixel point includes sub-pixel points of three different RGB, and different colors can be obtained by adjusting and fusing the amount of light reaching R, G, B sub-pixel points. The distribution area of the pixels is the same as that of the backlight layer 300, the pixels include a central pixel 601 and an outer frame pixel 602, the distribution area of the central pixel 601 corresponds to the position of the central backlight plate 301, the outer edge of the central pixel 601 is provided with the outer frame pixel 602, and the distribution area of the outer frame pixel 602 corresponds to the position of the outer frame backlight plate 302.
The implementation principle of the system for enhancing the image based on the superposition of the liquid crystal display is as follows:
the backlight plates are divided into a central backlight plate 301 and an outer frame backlight plate 302, the processing unit obtains the brightness value of each pixel point to be compared with a preset black brightness threshold value, the brightness value distribution conditions of the central pixel point 601 and the outer frame pixel point 602 are analyzed, and the central backlight plate 301 and the outer frame backlight plate 302 are controlled to be opened or closed.
Example 3:
the embodiment of the application discloses an image enhancement method based on liquid crystal display superposition.
The method of this embodiment is applied to the system described in embodiment 1, and the method logic calculation program is stored in the memory of the processing unit.
As shown in fig. 4, the method comprises the following steps:
s100, setting a black brightness threshold, wherein the black brightness threshold refers to that if the brightness of a pixel point is greater than the black brightness threshold, a picture is displayed, and if the brightness of the pixel point is less than or equal to the black brightness threshold, black is displayed.
S200, dividing pixel points:
dividing pixel points on the pixel layer 600 according to the positions of the central backlight board 301 and the outer frame backlight board 302 to obtain a central pixel point 601 and an outer frame pixel point 602, wherein the area formed by the central pixel point 601 is the same as the position of the central backlight board 301, and the area formed by the outer frame pixel point 602 is the same as the position of the outer frame backlight board 302;
the frame backlight board 302 further includes a first frame backlight board 303 and a second frame backlight board 304, and accordingly, the frame pixel points 602 are divided into a first frame pixel point 603 corresponding to the first frame backlight board 303 and a second frame pixel point 604 corresponding to the second frame backlight board 304.
S300, the processing unit acquires the brightness value of each pixel:
the processing unit obtains the brightness value of the central pixel point 601 to obtain a first brightness value; the processing unit obtains the brightness value of the outer frame pixel 602 to obtain a second brightness value, which includes obtaining the first outer frame pixel 603 to obtain a third brightness value and obtaining the second outer frame pixel 604 to obtain a fourth brightness value.
The processing unit of S400 judges according to the distribution of the first brightness value, the third brightness value and the fourth brightness value:
if the brightness value of each central pixel 601 and the brightness value of each outer frame pixel 602 are less than or equal to the black brightness threshold, the processing unit determines that the current picture is a pure black picture, and the processing unit controls the central backlight board 301 and the outer frame backlight board 302 to be closed;
when the first brightness value of any one of the center pixel points 601 is greater than the black brightness threshold, the fourth brightness value of each of the second frame pixel points 604 is less than or equal to the black brightness threshold, and the third brightness value of any one of the first frame pixel points 603 is greater than the black brightness threshold:
if the third brightness value of the first frame pixel points 603 in the α 1 line inward from the outer edge of the distribution area of the first frame pixel points 603 is less than or equal to the black brightness threshold value and the third brightness value of the first frame pixel points 603 in the β 1 line inward from the outer edge of the distribution area of the first frame pixel points 603 is less than or equal to the black brightness threshold value, the processing unit determines that the current picture is a movie-like picture, that is, the display presents a picture with a black edge, and the black edge is located in the distribution area of the first frame pixel points, the processing unit controls the central backlight panel 301 to be opened, and the first frame backlight panel 303 and the second frame backlight panel 304 to be closed;
wherein the content of the first and second substances,
and is
X1 is the total number of rows in the area of the first outer frame pixel 603, and Y1 is the total number of columns in the area of the first outer frame pixel 603;
when the first luminance value of any one of the center pixel points 601 and the third luminance value of any one of the first frame pixel points 603 are greater than the black luminance threshold, and the fourth luminance value of any one of the second frame pixel points 604 is less than or equal to the black luminance threshold:
if the fourth brightness value of the second frame pixel points 604 in the α 2 row inward from the outer edge of the distribution area of the second frame pixel points 604 is less than or equal to the black brightness threshold and the fourth brightness value of the second frame pixel points 604 in the β 2 row inward from the outer edge of the distribution area of the second frame pixel points 604 is less than or equal to the black brightness threshold, the processing unit determines that the current frame is a movie-like frame, that is, the display presents that the frame has a black edge, and the black edge is located in the distribution area of the second frame pixels, and the processing unit controls the central backlight panel 301 to be turned on, the first frame backlight panel 303 to be turned on, and the second frame backlight panel 304 to be turned off;
wherein the content of the first and second substances,
and is
X2 is the total number of rows in the second bezel pixel dot 604 area, and Y2 is the total number of columns in the second bezel pixel dot 604 area;
and the processing unit controls to open the backlight layer 300 at the same time when the playing of the next frame starts, and the steps are repeated.
The implementation principle of the image enhancement method based on liquid crystal display superposition is as follows:
the backlight board is divided into a central backlight board 301, a first outer frame backlight board 303 and a second outer frame backlight board 304, the processing unit obtains the brightness value of each pixel point to be compared with a preset black brightness threshold value, the brightness value distribution conditions of the central pixel point 601, the first outer frame pixel point 603 and the second outer frame pixel point 604 are analyzed, and the opening or closing of the central backlight board 301, the first outer frame backlight board 303 and the second outer frame backlight board 304 is controlled through the distribution proportion of black pixel points on the first outer frame pixel distribution area and the second outer frame pixel distribution area.
Example 4:
the method of the present embodiment is applied to the system described in embodiment 2, and the method logic calculation program is stored in the memory of the processing unit.
The method comprises the following steps:
s100, setting a black brightness threshold, wherein the black brightness threshold refers to that if the brightness of a pixel point is greater than the black brightness threshold, a picture is displayed, and if the brightness of the pixel point is less than or equal to the black brightness threshold, black is displayed.
S200, dividing pixel points:
dividing pixel points on the pixel layer 600 according to the positions of the central backlight board 301 and the outer frame backlight board 302 to obtain a central pixel point 601 and an outer frame pixel point 602, wherein the area formed by the central pixel point 601 is the same as the position of the central backlight board 301, and the area formed by the outer frame pixel point 602 is the same as the position of the outer frame backlight board 302;
s300, the processing unit acquires the brightness value of each pixel:
the processing unit obtains the brightness value of the central pixel point 601 to obtain a first brightness value; the processing unit obtains the brightness value of the outer frame pixel 602 to obtain a second brightness value.
The S400 processing unit judges according to the first brightness value distribution situation and the second brightness value distribution situation:
if the brightness value of each central pixel 601 and the brightness value of each outer frame pixel 602 are less than or equal to the black brightness threshold, the processing unit determines that the current picture is a pure black picture, and the processing unit controls the central backlight board 301 and the outer frame backlight board 302 to be closed;
when the first brightness value of any central pixel 601 is greater than the black brightness threshold and the second brightness value of any outer frame pixel 602 is less than or equal to the black brightness threshold:
if the second brightness value of the outline border pixel points 602 of the alpha lines inward from the outer edge of the distribution area of the outline border pixel points 602 is less than or equal to the black brightness threshold value and the second brightness value of the outline border pixel points 602 of the beta lines inward from the outer edge of the distribution area of the outline border pixel points 602 is less than or equal to the black brightness threshold value, the processing unit judges that the current picture is a movie-like picture, namely the display presents that a black edge exists on the picture, and the black edge is positioned on the distribution area of the outline border pixel points 602, and the processing unit controls the central backlight plate 301 to be opened and the outline border backlight plate 302;
wherein the content of the first and second substances,
and is
X is the total number of horizontal rows in the area of the outline pixel 602, and Y is the total number of vertical columns in the area of the outline pixel 602；
And the processing unit controls to open the backlight layer 300 at the same time when the playing of the next frame starts, and the steps are repeated.
The implementation principle of the image enhancement method based on liquid crystal display superposition is as follows:
the backlight plates are divided into a central backlight plate 301 and an outer frame backlight plate 302, the processing unit obtains the brightness value of each pixel point to be compared with a preset black brightness threshold value, the brightness value distribution conditions of the central pixel point 601 and the outer frame pixel point 602 are analyzed, and the central backlight plate 301 and the outer frame backlight plate 302 are controlled to be opened or closed according to the distribution proportion of the black pixel points in the outer frame pixel distribution area.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A system for image enhancement based on liquid crystal display overlay, characterized by: the display comprises a display body (100), wherein the display body (100) comprises a processing unit and a screen (200), and the screen (200) sequentially comprises a backlight layer (300), an equalizing layer (400), a light modulation layer (500) and a pixel layer (600) from inside to outside;
the backlight layer (300) is used for transmitting a light source to the pixel layer (600); the backlight device comprises a rectangular central backlight plate (301) positioned in the center of a display, wherein an outer frame backlight plate (302) in a rectangular frame shape is arranged on the edge of the central backlight plate (301), and the central backlight plate (301) and the outer frame backlight plate (302) are spliced to form the backlight layer (300); the opening or closing of the central backlight plate (301) and the outer frame backlight plate (302) is controlled by the processing unit;
the equalizing layer (400) is used for homogenizing the light emitted by the central backlight plate (301) and the outer frame backlight plate (302) and projecting the light to the light modulation layer (500);
the light modulation layer (500) comprises a first polarizing film (501) and a second polarizing film (503) which are different in direction, a liquid crystal layer (502) is arranged between the first polarizing film (501) and the second polarizing film (503), and the liquid crystal layer (502) is controlled by the processing unit;
the pixel layer (600) comprises a plurality of pixel points, and each pixel point comprises three different sub pixel points of RGB;
the pixel points comprise central pixel points (601) and outer frame pixel points (602), and the area formed by the central pixel points (601) is the same as the area formed by the central backlight plate (301);
the area formed by the outer frame pixel points (602) is the same as the area formed by the outer frame backlight plate (302);
the processing unit is used for receiving an input image and driving liquid crystal molecules of the liquid crystal layer (502) to rotate so as to image the input image on the pixel layer (600);
the backlight control circuit is further used for obtaining a first brightness value of each central pixel point (601) and a second brightness value of each outer frame pixel point (602), and controlling the opening or closing of the central backlight (301) and the outer frame backlight (302) according to the first brightness value distribution condition and the second brightness value distribution condition; the processing unit is also arranged to control the backlight layer (300) to be turned on at the same time as the start of each frame of the picture.
2. The system for image enhancement based on liquid crystal display overlay of claim 1, wherein: frame board (302) in a poor light includes first frame board in a poor light (303) and second frame board in a poor light (304), first frame board in a poor light (303) set up in the outward flange of central authorities board in a poor light (301), second frame board in a poor light (304) set up in the outward flange of first frame board in a poor light (303), central authorities board in a poor light (301), first frame board in a poor light (303) and second frame board in a poor light (304) concatenation form the board in a poor light (300).
3. The system for image enhancement based on liquid crystal display overlay of claim 2, wherein: the outline pixel points (602) comprise first outline pixel points (603) and second outline pixel points (604), the area formed by the first outline pixel points (603) corresponds to the first backlight plate, and the area formed by the second outline pixel points (604) corresponds to the second backlight plate.
4. The system for image enhancement based on liquid crystal display overlay of claim 1, wherein: the equalizing layer (400) is an atomized glass layer.
5. A method of image enhancement based on liquid crystal display overlay according to any of claims 1-4, characterized in that: the method comprises the following steps:
setting a black brightness threshold;
dividing pixel points on a pixel layer (600) according to the positions of a central backlight plate (301) and an outer frame backlight plate (302) to obtain a central pixel point (601) and an outer frame pixel point (602), wherein the area formed by the central pixel point (601) is the same as the position of the central backlight plate (301), and the area formed by the outer frame pixel point (602) is the same as the position of the outer frame backlight plate (302);
the processing unit acquires a first brightness value of each central pixel point (601) and a second brightness value of each outer frame pixel point (602), and judges according to a first brightness value distribution condition and a second brightness value distribution condition:
if the first brightness value of each central pixel point (601) and the second brightness value of each outer frame pixel point (602) are both smaller than or equal to the black brightness threshold, the processing unit judges that the current picture is a pure black picture, and the processing unit controls the central backlight board (301) and the outer frame backlight board (302) to be closed;
when the first brightness value of any central pixel (601) is greater than the black brightness threshold and the second brightness value of any outer frame pixel (602) is less than or equal to the black brightness threshold:
if the second brightness value of the outer frame pixel points (602) in the alpha row from the edge of the pixel layer (600) to the inside is smaller than or equal to the black brightness threshold value and the second brightness value of the outer frame pixel points (602) in the beta column from the edge of the pixel layer (600) to the inside is smaller than or equal to the black brightness threshold value, the processing unit judges that the current picture is a movie-like picture, and controls the central backlight plate (301) to be opened and the outer frame backlight plate (302) to be closed;
wherein the content of the first and second substances,
，
x is the total number of transverse rows of the area of the outer frame pixel point (602), and Y is the total number of longitudinal columns of the area of the outer frame pixel point (602); and lightening the backlight layer (300) while playing the next frame of picture, and repeating the steps.
6. The method of image enhancement based on liquid crystal display overlay of claim 5, wherein: the outline pixel points (602) comprise the outline pixel points (602) which comprise a first outline pixel point (603) and a second outline pixel point (604); the outer frame backlight plate (302) comprises a first outer frame backlight plate (303) and a second outer frame backlight plate (304); the area formed by the first outer frame pixel points (603) corresponds to the first backlight plate, and the area formed by the second outer frame pixel points (604) corresponds to the second backlight plate;
the processing unit further comprises a luminance value acquisition unit for the first outline pixel point (603) and the second outline pixel point (604): the processing unit acquires the brightness value of the first outer frame pixel point (603) to obtain a third brightness value and acquires the brightness value of the second outer frame pixel point (604) to obtain a fourth brightness value;
and the processing unit controls to open the backlight layer (300) at the same time when the playing of the next frame of picture is started, and the steps are repeated.
7. The method of image enhancement based on liquid crystal display overlay of claim 6, wherein:
the processing unit obtains a first brightness value of each central pixel point (601), a third brightness value of each first outer frame pixel point (603) and a fourth brightness value of each second outer frame pixel point (604), and judges and controls the opening or closing of the central backlight plate (301), the first outer frame backlight plate (303) and the second outer frame backlight plate (304) according to a first brightness value distribution condition, the second brightness value and the fourth brightness value distribution condition.
8. The method of image enhancement based on liquid crystal display overlay of claim 6, wherein: the movie-like picture refers to the current display presentation picture with black edges.
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