CN110211545B - Residual image eliminating method, residual image eliminating circuit and display device - Google Patents
Residual image eliminating method, residual image eliminating circuit and display device Download PDFInfo
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- CN110211545B CN110211545B CN201910403925.3A CN201910403925A CN110211545B CN 110211545 B CN110211545 B CN 110211545B CN 201910403925 A CN201910403925 A CN 201910403925A CN 110211545 B CN110211545 B CN 110211545B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 29
- 230000008030 elimination Effects 0.000 claims description 26
- 238000003379 elimination reaction Methods 0.000 claims description 26
- 206010047571 Visual impairment Diseases 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 239000003086 colorant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- -1 KFS phosphor) Chemical compound 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
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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
- G09G3/36—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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/027—Arrangements or methods related to powering off a display
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The method for eliminating the residual image comprises the following steps of detecting RGB values of all display areas of the residual image on a display panel at the moment of power failure of the backlight source, generating a compensation image according to the residual image, and enabling the sum of the RGB values of all the display areas of the compensation image and the RGB values of all the display areas of the residual image to be the original RGB value of the display area; and enabling the display panel to display the compensation image, wherein the display time length of the compensation image is a preset time length. The display device can eliminate residual light or residual images existing in the conventional display device by outputting a compensation picture with a certain gray level, and improve the display quality.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a method, a circuit and a display device for eliminating an afterimage.
Background
The afterimage, in the field of photoelectric display, mainly refers to an image remaining on a display, that is, when the display is switched or turned off, a previously displayed image does not disappear immediately, but disappears slowly.
In the method of periodically driving the light sources, generally, each pixel is driven on the liquid crystal panel at a proper time, and the light sources are periodically and sequentially driven in cooperation with the arranged light sources, so that the backlight module locally provides light to the liquid crystal panel. This prevents the problem of motion blur which occurs when a moving picture is displayed. In the backlight module using the method of periodically driving the light sources, although the problem of motion blur can be prevented to some extent, the light source having the phosphor is used, and the light emission phenomenon of the phosphor is still maintained for a short period of time after the light sources are stopped being driven, thereby causing the problem of residual light or residual image.
Disclosure of Invention
The present application is directed to a method, a circuit and a display device for eliminating residual image, so as to eliminate residual light or residual image in the conventional display device.
Detecting RGB values of each display area of residual images on the display panel at the moment of power-off of the backlight source, generating a compensation image according to the residual images, and enabling the sum of the RGB values of each display area of the compensation image and the RGB values of each display area of the residual images to be the original RGB value of the display area; and enabling the display panel to display the compensation image, wherein the display time length of the compensation image is a preset time length; the predetermined time length is determined according to the residual time of the residual image on the screen, or the predetermined time length ranges from 1 to 2 frames of images, or the predetermined time length ranges from 5ms to 15 ms.
In one embodiment, the method further comprises the steps of: when the normal image data transmission stops, the backlight source is powered off.
The present application further provides a ghost eliminating circuit for a display, the display has a backlight and a display panel, the backlight has a phosphor coating, including: the residual image acquisition unit is connected with the display panel of the display and used for acquiring the RGB values of each display area of the residual image on the display panel at the moment of power failure of the backlight source; the compensation image output unit is connected with the display panel, instructs the display panel to output a compensation image according to the RGB values of all display areas of the residual image on the display panel at the moment of power failure of the backlight source, and enables the sum of the RGB values of all the display areas of the compensation image and the RGB values of all the display areas of the residual image to be the original RGB value of the display area; the time control unit is connected with the compensation image output unit and is used for controlling the starting time and the ending time of the compensation image displayed on the display panel and enabling the display time length to be a preset time length; the predetermined time length is determined according to the residual time of the residual image on the screen, or the predetermined time length ranges from 1 to 2 frames of images, or the predetermined time length ranges from 5ms to 15 ms.
In one embodiment, the time control unit determines the predetermined time length according to a residual time of the residual image on the screen.
In one embodiment, when the time control unit receives a signal for stopping data transmission, the display panel stops normal image data transmission, the backlight is turned off, and the compensated image output unit starts to output the compensated image.
The application further provides a display device, which comprises a display and a time schedule controller, wherein the time schedule controller is used for receiving a signal from a front-end system through a connector and transmitting the signal to the display; the display is provided with a display panel and a backlight source, and the display is provided with any one of the afterimage elimination circuits which are connected with the display panel and the backlight source of the display.
In one embodiment, the display area includes a first pixel and a second pixel; the compensation image output unit indicates the second pixel to output a compensation image so as to improve the phenomenon of residual light.
In another embodiment, the first pixel includes a red sub-pixel, and the second pixel includes a green sub-pixel and a blue sub-pixel; the fluorescent powder coating of the backlight source is a red fluorescent powder coating; the compensation image output unit indicates the green sub-pixel and the blue sub-pixel to generate the compensation image, so that the display color of the backlight source is neutralized with the color displayed by the display panel, and the phenomenon of turning-off and turning-over red is improved.
According to the method and the device, the display data of the residual image are acquired, the light emitting mode of the backlight source is adjusted, the compensation image data are provided accordingly, the residual image on the display panel can be eliminated through the compensation picture outputting a certain gray level, and particularly when the fluorescent powder coating of the backlight source is red fluorescent powder, the phenomenon that the picture is reddish in the moment of shutdown can be well improved, and the display quality is improved.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical means of the present application more clearly understood, the present application may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present application more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of an image sticking elimination method according to the present application.
Fig. 2 is a schematic diagram of an image sticking elimination circuit according to the present application.
FIG. 3 is a diagram of another image sticking elimination circuit according to the present application.
FIG. 4 is a schematic diagram of a display area according to the present application.
FIG. 5 is a schematic diagram of a display device having the image sticking elimination circuit of the present application.
FIG. 6 is a schematic diagram of another display device having the image sticking elimination circuit of the present application.
FIG. 7 is a schematic diagram of another display device having the image sticking elimination circuit of the present application.
Detailed Description
To further explain the technical means and effects of the present application for achieving the intended application, the following detailed description is given to specific embodiments, methods, steps, structures, features and effects of the image sticking elimination method and the image sticking elimination circuit according to the present application with reference to the accompanying drawings and preferred embodiments.
The foregoing and other technical matters, features and effects of the present application will be apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings. While the present application is susceptible to embodiment and specific details, specific reference will now be made in detail to the present disclosure for the purpose of illustrating the general principles of the invention.
Referring to fig. 1, it shows a method for removing afterimage provided by the present invention, which is used for a display having a backlight source and a display panel, wherein the backlight source has phosphor, the method includes steps of S1, detecting RGB values of each display area of the afterimage on the display panel at the moment of power-off of the backlight source; step S2, generating a compensation image according to the residual image, and setting the sum of the RGB values of each display area of the compensation image and the RGB values of each display area of the residual image as the original RGB values of the display area; and step S3, making the display panel display the compensation image, and making the display time length of the compensation image be a preset time length.
Specifically, in an embodiment, before the step S1, the method further includes a step S0: when the normal image data transmission stops, the backlight source is powered off. In this embodiment, the method is used for image sticking elimination when the display is normally turned off. And outputting the compensation image after the normal image data transmission is stopped and the backlight source is powered off.
Specifically, each display region is, for example, a group of pixels of the display panel. The original RGB values of the display area are the RGB values of the display area when the display panel is in standby. Specifically, the predetermined length of time may be determined by detecting the residual time of the obtained image on the screen in real time, or may be obtained by detecting the residual time of the obtained phosphor or the residual time of the image in advance, for example, the predetermined length of time is one of the following length ranges: 5ms to 15 ms; displaying 1 to 2 frames of image time. More specifically, when the phosphor is a red phosphor, the afterimage is generated due to a long residual time of the phosphor, and the predetermined time length is 10 ms.
According to the image sticking elimination method, the present invention further provides an image sticking elimination circuit, referring to fig. 2, the image sticking elimination circuit comprising: an afterimage acquisition unit 20 for acquiring RGB values of pixels of an afterimage on the display panel after the backlight is powered off; a compensation image output unit 40 for instructing the display panel to output a compensation image according to the RGB values of the pixels of the residual image at the moment of power-off of the backlight source, wherein the compensation image output unit makes the sum of the RGB values of the pixels of the compensation image and the RGB values of the pixels of the residual image be the original RGB values of the display area; and a time control unit 60 for controlling the display time length of the compensated image on the display panel to be a predetermined time length.
Specifically, the time control unit 60 determines the predetermined time length based on the residual time of the afterimage on the screen.
More specifically, the predetermined time length may be determined according to the residual characteristics of the phosphor, or may be determined by detecting the residual time of the residual image in advance. For example, according to the residual characteristics of the phosphor or the residual time of the residual image detected in advance, the predetermined length of time may be set to one of the following length ranges: 5ms to 15 ms; time of displaying 1 or 2 frames of images. For example, when the phosphor is a red phosphor, the predetermined time length may be set to 10ms, or the predetermined time length may be set to allow the compensated image output unit 40 to output 1 to 2 frames, so as to improve the shutdown blushing phenomenon.
More specifically, the predetermined time length may also be determined or adjusted in real time by the RGB values of each display region of the afterimage acquired in real time by the afterimage acquisition unit 20 to determine the output time of the compensated image. Referring to fig. 3, the time control unit 60 is connected to the residual image obtaining unit 20 to receive the RGB values of the display areas obtained by the residual image obtaining unit 20, and accordingly, determine whether the residual image on the display panel has disappeared, and further determine the predetermined time length.
When the time control unit 60 receives the signal of stopping data transmission, the display panel stops normal image data transmission, the backlight is turned off, and the compensated image output unit 40 starts to output the compensated image.
More specifically, refer to fig. 4. In one embodiment, the display area includes a first pixel and a second pixel. In the present application, all pixels adjacent to the first pixel are defined as the second pixel. When the device is turned off, the compensation image is generated by the second pixel.
Please refer to fig. 5. The backlight 204 includes a chip and phosphor. In one embodiment, the red phosphor and the blue LED chip used to excite it constitute the backlight 204. In this embodiment, the first pixel includes a red sub-pixel, and the second pixel includes a green sub-pixel and a blue sub-pixel. The residual image is generated due to the residual light characteristics of the red phosphor in the backlight 204, and the compensated image is generated by the green sub-pixel and the blue sub-pixel. The compensation image output unit 40 indicates the green sub-pixels and the blue sub-pixels to generate compensation images, so that the display color of the backlight 204 is neutralized with the color displayed by the display panel 202, and the phenomenon of red color when the display device is turned off is improved. In other words, the compensation image is neutralized by the red color caused by the residual light of the red phosphor when the backlight 204 is turned off, so that the display color of the display area of the display panel 202 is opposite to the display color of the backlight 204 and is neutralized. More specifically, the sum of the RGB values of the display areas of the display panel 202 and the RGB values of the display areas of the backlight 204 is the original RGB value of the display area, for example, white or black, i.e., the RGB value is (0,0,0) or (255 ), or the RGB values of other colors displayed when the display panel 202 is in standby, thereby eliminating the ghost and improving the phenomenon of red-out when the display panel is in standby. In other words, the blue LED chip and the green phosphor output the compensation image according to the indication from the compensation image output unit 40, so as to improve the shutdown blushing phenomenon.
In another embodiment, the afterimage may be caused by phosphors with other colors or other formulations, and these afterimages can be eliminated by the above method. For example, in a liquid crystal display in which a blue LED chip is used to excite a yellow phosphor to obtain white light, and the white light is used as a backlight light source, the afterimage phenomenon caused by the yellow phosphor can also be eliminated by the above method.
The image sticking elimination circuit 100 can be applied to various display devices 400, including a display 200 and a timing controller 208, wherein the timing controller 208 is used for receiving a signal from the front-end system 300 through a connector 206 and transmitting the signal to the display 200. The display 200 has a display panel 202 and a backlight 204. The display 200 has any of the image sticking elimination circuits 100 described above. The following takes a liquid crystal display as an example to further explain the image sticking elimination circuit. Referring to FIG. 5, the LCD 200 according to the present invention has a display panel 202, a backlight 204 and an afterimage elimination circuit 100. The afterimage elimination circuit 100 includes the afterimage acquisition unit 20, the compensated image output unit 40, and the time control unit 60. As shown in fig. 5, the afterimage obtaining unit 20 is connected to the display panel 202 of the liquid crystal display 200 to obtain RGB values of each display area, such as a pixel or a group of pixels, of the afterimage on the display panel 202 at the moment when the backlight 204 is powered off. The compensated image output unit 40 instructs the display panel 202 to output the compensated image according to the RGB values of the display regions of the residual image at the moment when the backlight 204 is powered off, and the sum of the RGB values of the display regions of the compensated image and the RGB values of the display regions of the residual image is the original RGB values of the display regions, that is, the RGB values of the display regions when the liquid crystal display 200 is in the standby state. The time control unit 60 is connected to the compensated image output unit 40, and is configured to control the display time length of the compensated image on the display panel 202 to be a predetermined time length. The predetermined time length may be adjusted according to a specific use environment. For example: when the phosphor coating in the backlight 204 is a red phosphor coating, the predetermined time length may be set in advance to be 10ms, or the time for displaying 1 frame or 2 frames of images; and when the phosphor coating in the backlight 204 is a yellow phosphor or a green phosphor or a mixture thereof, the predetermined length of time may be set to less than 10ms, for example, 7 ms. The predetermined time length may be a fixed value as described above, or may be adjusted in real time based on the RGB values of the afterimage fed back by the afterimage acquisition unit 20. For example, referring to fig. 6, after the residual image obtaining unit 20 continuously feeds back the RGB values of each display area of the residual image to the time control unit 60 in real time, the time control unit 60 may determine the residual time of the residual image according to the RGB values, and then adjust the predetermined time length in real time.
Further reference is made to fig. 5, 6 and 7. When the lcd system having the image sticking elimination circuit of the present invention is in operation, image data is transmitted from the front-end system 300 to the lcd 200 through the connector 206 and the timing controller 208. When the Timing Controller (TCON)208 detects a disable signal transmitted from the system, and the falling edge of the data enable signal En arrives, that is, a signal for stopping data transmission is received, and when the Backlight (BL)204 is turned off, the residual image acquisition unit 20 is instructed to acquire RGB values of each display area of the residual image on the display panel 202 at the moment of power failure, and transmit the RGB values to the compensation image output unit 40, so that the compensation image output unit 40 generates a compensation image according to the RGB values of each display area of the residual image, and when the backlight 204 is turned off and is reddened due to the residual light characteristics of the red phosphor, outputs a compensation picture generated by the green sub-pixels and the blue sub-pixels. Meanwhile, the time control unit 60 controls the display time of the compensated image on the display panel 202 according to the predetermined time length or the time length obtained by real-time adjustment. The predetermined length of time may be stored in the time control unit 60 in advance.
In summary, in the present application, for the shutdown blushing phenomenon caused by the residual light characteristics of the red phosphor (such as KFS phosphor), a compensation image is inserted into the display panel according to the residual color of the backlight source, so that the color displayed by the display panel and the color displayed by the backlight source are opposite to each other and are neutralized, that is, the sum of the RGB value of each display area of the backlight source and the RGB value of the display area of the display panel is the original RGB value of the display area, for example, white or black, that is, the RGB value is (0,0,0) or (255,255,255,255), or the RGB value of other colors displayed when the display panel is in standby, and further, the residual image is eliminated.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.
Claims (8)
1. A method of ghost elimination for a display having a backlight with a phosphor coating and a display panel, the method comprising the steps of:
detecting the RGB value of each display area of the residual image on the display panel at the moment of power failure of the backlight source;
generating a compensation image according to the residual image, and enabling the sum of the RGB value of each display area of the compensation image and the RGB value of each display area of the residual image to be the original RGB value of the display area; and
enabling the display panel to display the compensation image, and enabling the display time length of the compensation image to be a preset time length;
the predetermined time length is determined according to the residual time of the residual image on the screen, or the predetermined time length ranges from 1 to 2 frames of images, or the predetermined time length ranges from 5ms to 15 ms.
2. The afterimage elimination method according to claim 1, further comprising the steps of: when the normal image data transmission stops, the backlight source is powered off.
3. An afterimage elimination circuit (100) for a display (200) having a backlight (204) and a display panel (202), the backlight (204) having a phosphor coating, comprising:
an afterimage acquisition unit (20) connected to the display panel (202) of the display (200) and configured to acquire RGB values of each display area of the afterimage on the display panel (202) at the moment when the backlight (204) is powered off;
a compensation image output unit (40) which is connected with the display panel (202), instructs the display panel (202) to output a compensation image according to the RGB value of each display area of the residual image on the display panel (202) at the moment when the backlight source (204) is powered off, and enables the sum of the RGB value of each display area of the compensation image and the RGB value of each display area of the residual image to be the original RGB value of the display area; and
a time control unit (60) connected with the compensation image output unit (40) and used for controlling the starting time and the ending time of the display of the compensation image on the display panel (202) and enabling the display time length to be a preset time length;
the predetermined time length is determined according to the residual time of the residual image on the screen, or the predetermined time length ranges from 1 to 2 frames of images, or the predetermined time length ranges from 5ms to 15 ms.
4. The image sticking elimination circuit (100) of claim 3, wherein the time control unit (60) determines the predetermined time length according to a residual time of the residual image on the screen.
5. The image sticking elimination circuit (100) of claim 3, wherein the timing control unit (60) stops the normal image data transmission of the display panel (202) when receiving the signal of stopping the data transmission, the backlight (204) is turned off, and the compensated image output unit (40) starts outputting the compensated image.
6. A display device (400), characterized by: comprises a display (200) and a timing controller (208), wherein the timing controller (208) is used for receiving a signal from a front-end system (300) through a connector (206) and transmitting the signal to the display (200); the display (200) has a display panel (202) and a backlight (204), and the display (200) has the image sticking elimination circuit (100) of any one of the above claims 3 to 5, the image sticking elimination circuit (100) connecting the display panel (202) and the backlight (204).
7. The display device (400) of claim 6, wherein:
the display area includes a first pixel and a second pixel;
the compensation image output unit (40) instructs the second pixel to output a compensation image to improve the phenomenon of residual light.
8. The display device (400) of claim 7, wherein:
the first pixel comprises a red sub-pixel, and the second pixel comprises a green sub-pixel and a blue sub-pixel;
the fluorescent powder coating of the backlight source (204) is a red fluorescent powder coating;
the compensation image output unit (40) indicates the green sub-pixel and the blue sub-pixel to generate the compensation image, so that the display color of the backlight source (204) is neutralized with the color displayed by the display panel (202), and the phenomenon of turning-off and turning-over red is improved.
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| CN112885308B (en) * | 2021-01-21 | 2022-10-25 | 浙江易云物联科技有限公司 | System and method for preventing polarization of LCD (liquid crystal display) panel |
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| CN108281118A (en) * | 2018-01-09 | 2018-07-13 | 昆山龙腾光电有限公司 | Display panel and liquid crystal display device |
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