CN116343690A - Backlight light source brightness control method suitable for variable refresh rate liquid crystal display - Google Patents
Backlight light source brightness control method suitable for variable refresh rate liquid crystal display Download PDFInfo
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- 238000010586 diagram Methods 0.000 description 6
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
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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
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0435—Change or adaptation of the frame rate of the video stream
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention provides a backlight light source brightness control method suitable for a variable refresh rate liquid crystal display, which comprises the following steps: controlling the brightness of the backlight light source to be 0 in the black frame insertion time T1 in one frame time T; further comprises: when the display works in the variable refresh rate mode, the time of one frame time T except for the black frame inserting time T1 is divided into a second time T2 and a third time T3, the brightness of the backlight light source in the third time T3 is third brightness L3, and the third brightness L3 is the same as the average brightness of the backlight light source in the (T1 + T2) time. The invention relates to the technical field of displays, and dynamically adjusts the brightness of a backlight light source in a frame time back section according to the real-time refresh rate of a liquid crystal display, so that the actual brightness of the liquid crystal display in each frame time is kept consistent, the negligence of the brightness of the backlight light source caused by the change of the refresh rate of the display is avoided, and the invention has the beneficial effect of improving the visual experience.
Description
Technical Field
The invention relates to the technical field of displays, in particular to a backlight light source brightness control method suitable for a variable refresh rate liquid crystal display.
Background
By utilizing the persistence effect of human eyes, the display can realize the playing of the dynamic video picture by playing a Zhang Jingtai picture in rapid succession. The number of still pictures that a display can play in one second is called the refresh rate in Hz; the number of still pictures contained in one second by the video source provided to the display is referred to as the frame rate in FPS. Conventional displays operate at a fixed refresh rate as set, such as at a fixed refresh rate of 30Hz, 60Hz, 120Hz, or 144Hz, and the display can better display video pictures when the frame rate of the video source is also a fixed value. If the video source comes from the game picture rendered by the display card, the frame rate of the video source transmitted to the display is not fixed any more because of different rendering time required by different game scenes, and at this time, if the display still plays the video source at a fixed refresh rate, the frame rate of the video source is not matched with the refresh rate of the display, so that the video picture played by the display is torn or blocked. Meanwhile, if the frame rate of the video source is a lower fixed value and the refresh rate of the display is higher, although abnormal video picture playing will not occur, extra system power consumption will be increased due to the higher refresh rate of the display. To solve the above problems, a variable refresh rate (VRR, variable Refresh Rate) technique is proposed. Based on the VRR technology, the refresh rate of the display is not a fixed value, but is dynamically adjusted according to the frame rate of the video source, the display is not refreshed before the end of rendering a frame of picture by the display card, and the display can refresh and display a new frame of picture after the end of rendering. The VRR technology enables the refresh rate of the display to be consistent with the frame rate of the video source all the time, so that the video picture displayed by the display is free from abnormality, and the system power consumption when the low-frame-rate video source is displayed can be reduced.
For a liquid crystal display, the control of the display screen comprises color control of the liquid crystal panel and brightness control of the backlight light source, and the refresh rate of the display comprises the refresh rate of the liquid crystal panel and the refresh rate of the backlight light source. When the VRR technology is applied to a liquid crystal display, the refresh rates of the liquid crystal panel and the backlight light source are dynamically adjusted to be consistent with the frame rate of the video source to ensure the optimum display. The switching of the picture of the liquid crystal display is realized through the color inversion of the liquid crystal layer, the time required by the color inversion of the liquid crystal layer is called response time, and the color of the liquid crystal layer is represented as transition color in the response time, so that the display picture seen by human eyes has a smear phenomenon. If the backlight is turned off during the response time of the liquid crystal layer, the transition color is not seen, thereby improving the smear of the picture, and this off control of the backlight is called black frame insertion (BFI, black Frame Insertion).
When the VRR technology and the BFI technology are applied to the liquid crystal display at the same time, since the BFI time of the backlight source is usually set to a fixed value and the refresh rate of the display is dynamically adjustable, the actual brightness of the display at one frame time is the average brightness of the total time of the black frame insertion time and the actual display time, and then the backlight sources configured with the same brightness information will show different actual brightness under different refresh rates, which affects the visual experience.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides a backlight light source brightness control method suitable for a variable refresh rate liquid crystal display, which can dynamically adjust the brightness of a backlight light source according to the change of the refresh rate, so as to realize the stability of the average brightness of backlight within one frame time and improve the visual experience.
A backlight light source brightness control method suitable for a variable refresh rate liquid crystal display, comprising: controlling the brightness of the backlight light source to be 0 in the black frame insertion time T1 in one frame time T; further comprises:
when the display works in the variable refresh rate mode, the time of one frame time T except for the black frame inserting time T1 is divided into a second time T2 and a third time T3, the brightness of the backlight light source in the third time T3 is third brightness L3, and the third brightness L3 is the same as the average brightness of the backlight light source in the (T1 + T2) time.
Preferably, the second time T2 is set to be
Millisecond, where Ymax represents the highest refresh rate of the liquid crystal display.
In any of the above embodiments, it is preferable that the luminance of the backlight light source is a second luminance L2 in the second time T2, and the value of the second luminance L2 is a fixed value.
In any of the above embodiments, the third time T3 is preferably set to a value of
And millisecond, wherein Y represents the refresh rate of the liquid crystal display corresponding to one frame time T, and Y is less than or equal to Ymax.
In any of the above embodiments, the third luminance L3 is preferably set to a value of
In any of the above embodiments, it is preferable that the third time T3 is located after the second time T2 within one frame time T, and the second time T2 is located after the black frame insertion time T1.
Either of the above-described schemes is preferable that the black frame insertion time T1 is the same for each frame.
In any of the above embodiments, the second luminance L2 is preferably set to be the backlight source luminance when the lcd operates at the fastest fixed refresh rate.
In any of the above embodiments, it is preferable that the luminance of the backlight light source is set to a fixed value during a frame time T other than the black frame insertion time T1 when the liquid crystal display is operated in the fixed refresh rate mode.
The backlight source brightness control method suitable for the variable refresh rate liquid crystal display has the following steps
The beneficial effects are that:
for the liquid crystal display working in the variable refresh rate mode, the brightness of the backlight light source in the back section of one frame time is dynamically adjusted according to the real-time refresh rate of the liquid crystal display, so that the actual brightness of the liquid crystal display is kept consistent in each frame time, the accurate control of the brightness of the backlight light source of the liquid crystal display adopting the VRR technology and the BFI technology is realized, and the problems that the brightness of the backlight light source is negligent and small and the visual experience is influenced due to the change of the refresh rate of the display are avoided; meanwhile, the actual brightness of the liquid crystal display when working in the variable refresh rate mode is the same as the actual brightness when working in the fixed refresh rate mode, so that the problem of inconsistent visual experience caused by inconsistent brightness of backlight light sources in different working modes is avoided.
Drawings
Fig. 1 is a schematic diagram of a variable refresh rate technology in the prior art.
Fig. 2 is a schematic diagram of a black frame inserting technique in the prior art.
Fig. 3 is a schematic diagram of a combination of a variable refresh rate technique and a black frame insertion technique in the prior art.
FIG. 4 is a schematic diagram showing the setting of a fixed brightness for a backlight source at a fixed refresh rate.
FIG. 5 is a schematic diagram of a fixed brightness setting for a backlight source at a variable refresh rate.
Fig. 6 is a schematic view showing backlight brightness control of a backlight brightness control method suitable for a variable refresh rate liquid crystal display according to the present invention.
Detailed Description
The invention will be described in more detail with reference to specific examples.
The prior art mentioned in the background art will be described in further detail with reference to the drawings so that the technical solution of the present invention can be better understood.
A schematic diagram of the variable refresh rate technology in the prior art is shown in fig. 1. The display card renders the picture A, the picture B, the picture C, the picture D and the picture … … according to the sequence; after the display card finishes rendering the picture A, the display is refreshed, and the picture A is displayed; after the display card finishes rendering the picture B, the display is refreshed, the display of the picture A is ended, and the display of the picture B is started; after the display card renders the picture C, the display is refreshed, the display of the picture B is ended, the display of the picture C is started, and the like. Because the graphics cards take different times to render the pictures A, B, C, D, … …, the time interval between two refreshes of the display is different, i.e., the refresh rate of the display is a variable refresh rate. The variable refresh rate technique can keep the refresh rate of the display consistent with the frame rate of the video source, and solves the problems of tearing and jamming of the picture.
As shown in fig. 2, since the switching of the picture of the lcd is achieved by color inversion of the lcd, and the time required for color inversion of the lcd is called response time, the color of the lcd appears as transition color in the corresponding time, and the picture seen by the human eye has a smear phenomenon, in order to solve this problem, a black frame inserting technique is introduced into the lcd, that is, the backlight source is turned off and controlled in the corresponding time, so that the transition color is not seen by the human eye.
As shown in fig. 3, when the VRR technology and the BFI technology are applied to the liquid crystal display at the same time, since the black frame insertion time of the backlight source is generally configured to be a fixed value and the refresh rate of the display is dynamically adjustable, configuring the same brightness of the backlight source at different refresh rates may cause the display to exhibit different actual brightness. Specifically, in fig. 3, taking the display of the display screen a and the display screen B as an example, the backlight source luminance is configured to be Z%; when the picture A is displayed, the actual brightness of the display when the picture A is displayed is only slightly lower than the brightness Z < lambda > because the refresh rate is lower and the one-frame time is longer and the proportion of the black frame insertion time to the total one-frame time is lower; when the display screen B is displayed, the refresh rate is higher, the frame time is shorter, and the ratio of the black frame insertion time to the total frame time is higher, so that the difference between the actual brightness and the brightness Z% when the display screen B is displayed is larger. Therefore, when the brightness of the backlight light source is configured to be a fixed value, the actual brightness is changed in a negligible way when the display displays different pictures, and the visual experience of human eyes is affected.
Example 1
A backlight light source brightness control method suitable for a variable refresh rate liquid crystal display, comprising: controlling the brightness of the backlight light source to be 0 in the black frame insertion time T1 in one frame time T; further comprises:
when the display works in the variable refresh rate mode, the time of one frame time T except for the black frame inserting time T1 is divided into a second time T2 and a third time T3, the brightness of the backlight light source in the third time T3 is third brightness L3, and the third brightness L3 is the same as the average brightness of the backlight light source in the (T1 + T2) time.
In this embodiment, it is preferable that the second time T2 has a value of
And in millisecond, ymax represents the highest refresh rate of the liquid crystal display, the brightness of the backlight light source is second brightness L2 in the second time T2, and the value of the second brightness L2 is a fixed value. The third time T3 is +.>
In millisecond, Y represents a refresh rate of the LCD corresponding to a frame time T, Y is less than or equal to Ymax, and the value of the third brightness L3 is
It should be noted that, in a frame time T, the third time T3 is located after the second time T2, and the second time T2 is located after the black frame insertion time T1; the black frame insertion time T1 is the same for each frame.
The principle of the present application scheme is specifically explained below.
First, as shown in FIG. 4, when the LCD is operated at a fixed refresh rate Y1, the black frame insertion time is recorded as T1, the brightness of the backlight source is fixedly set to Z% of the maximum brightness, then a frame time T (the time taken for the display to switch from the start to finish displaying a frame) is (1000/Y1) ms, then the average brightness of the backlight source in a frame time, that is, the actual brightness of the backlight source in the frame time is
When the VRR technology is adopted in the display, the refresh rate is dynamically changed, that is, as shown in fig. 5, the refresh rates Y2, Y3, Y4, and … … corresponding to each frame are different, and if the brightness of the backlight source is still set to be a fixed value Z%, then, with the continuous change of the refresh rate, the actual brightness of the backlight source in each frame time also changes, so that the brightness of the backlight source flickers with negligence.
When the display adopts the VRR technology, the display is limited by the hardware performance and is provided with the highest refresh rate, and the symbol Ymax is used for representing the highest refresh rate of the display, and accordingly, the minimum value of one frame time for a certain frame picture is
Millisecond. The refresh rate of the LCD corresponding to a certain frame is represented by Y, and the value of Y is less than or equal to Ymax, so that the frame time T of the frame is +.>
Millisecond, one frame time of the frame picture is greater than or equal to +.>
Millisecond.
For the frame picture, in a frame time T, firstly, a black frame inserting time T1, and in the black frame inserting time T1, the brightness of a backlight light source is 0, namely, the brightness is completely dark; then, a second time T2 is set, and the brightness of the backlight light source is L2 in the second time T2; and finally, a third time T3, wherein the brightness of the backlight light source is L3 in the time T2. For this frame of picture, the average luminance of the backlight source during the time (t1+t2) can be expressed as:
considering that a frame time T of the frame picture is equal to or more than + ->
Millisecond let the second time T2 take on +.>
Millisecond(s) then->
Millisecond-like, the average brightness of the backlight source in the (T1 + T2) time is +.>
In the third time T3 of the frame, the actual brightness of the backlight source is guaranteed to be +.>
Since the black frame insertion time T1 is the same for each frame of picture, the value of Ymax is fixed, and the value of the second brightness L2 is also fixed, the actual brightness of the backlight light source is the same for each frame of picture, and no inadvertent change occurs.
That is, as shown in fig. 6, for a certain frame of the picture, in a frame time T, the brightness of the backlight source is first controlled to be maintained for T1 time to be fully dark, and then the brightness of the backlight source is controlled to be maintained
Fixed luminance L2 of time, finally controlling luminance maintenance of backlight light source +.>
Luminance of time->
For example, for a certain type of LCD, it adopts VRR and BFI technology, its black frame insertion time is 1mS, its supported highest refresh rate is 144Hz, then the minimum value of the corresponding one-frame time is
Setting the second brightness L2 to be 50% of the maximum brightness, and setting the current refresh rate to be 60Hz, namely setting the current one-frame time to be +.>
Then the average brightness of the backlight source is +.f in (T1 + T2) time>
Then the brightness of the backlight source is controlled to be: full dark plus +.1 mS>
Is added with +.>
Is equal to 42.8% of the brightness. Thus, for each frame, the actual brightness of the backlight source corresponding to each frame was 42.8% of the maximum brightness. The brightness of the backlight light source is dynamically adjusted at the rear section of one frame time, so that the method can adapt to different refresh rates to achieve the stability of the actual brightness of the backlight light source of each frame of picture, and the visual experience is improved.
Since Y is equal to or less than Ymax, the value of the third time T3 may be 0, and at this time, the backlight source is controlled to directly enter the backlight source of the next frame of picture after the backlight source is maintained at the second brightness L2 for the second time T2.
Example 2
This embodiment is similar to the above-described embodiment, except that, in this embodiment, it is preferable that the luminance of the backlight light source is set to a fixed value during a frame time T other than the black frame insertion time T1 when the liquid crystal display is operated in the fixed refresh rate mode; when the liquid crystal display is operated at the fastest fixed refresh rate, the brightness of the backlight light source in a frame time T except for the black frame insertion time T1 is Z%. Meanwhile, when the liquid crystal display works in the VRR mode, the value of the second brightness L2 is the fixed value Z%. Therefore, the actual brightness of the liquid crystal display when working in the variable refresh rate mode is the same as the actual brightness of the liquid crystal display when working in the fixed refresh rate mode, and the problem of inconsistent visual experience caused by inconsistent brightness of the backlight light source in different working modes is avoided.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the foregoing embodiments are illustrative of the present invention in detail, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents, which do not depart from the scope of the technical scheme of the present invention.
Claims (8)
1. A backlight light source brightness control method suitable for a variable refresh rate liquid crystal display, comprising: controlling the brightness of the backlight light source to be 0 in the black frame insertion time T1 in one frame time T; the method is characterized in that: further comprises:
when the display works in the variable refresh rate mode, the time of one frame time T except for the black frame inserting time T1 is divided into a second time T2 and a third time T3, the brightness of the backlight light source in the third time T3 is third brightness L3, and the third brightness L3 is the same as the average brightness of the backlight light source in the (T1 + T2) time.
2. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 1, wherein: the value of the second time T2 is
Millisecond, where Ymax represents the highest refresh rate of the liquid crystal display.
3. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 2, wherein: the brightness of the backlight source is the second brightness L2 within the second time T2, and the value of the third brightness L3 is
4. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 2, wherein: the third time T3 takes the value of
And millisecond, wherein Y represents the refresh rate of the liquid crystal display corresponding to one frame time T, and Y is less than or equal to Ymax.
5. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 1, wherein: within a frame time T, the third time T3 is located after the second time T2, and the second time T2 is located after the black frame insertion time T1.
6. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 1, wherein: the black frame insertion time T1 is the same for each frame.
7. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 3, wherein: the value of the second brightness L2 is the backlight source brightness when the set lcd operates at the fastest fixed refresh rate.
8. The backlight source brightness control method for a variable refresh rate liquid crystal display of claim 1, wherein: when the liquid crystal display is operated in the fixed refresh rate mode, the brightness of the backlight light source is set to a fixed value for a frame time T except for the black frame insertion time T1.
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| CN202310165476.XA CN116343690A (en) | 2023-02-24 | 2023-02-24 | Backlight light source brightness control method suitable for variable refresh rate liquid crystal display |
| CN202410190439.9A CN117831473A (en) | 2023-02-24 | 2024-02-21 | Backlight light source brightness control method of display with variable refresh rate and backlight driving chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116798376A (en) * | 2023-08-02 | 2023-09-22 | 苏州华星光电技术有限公司 | Display panel and driving method thereof |
| CN116798376B (en) * | 2023-08-02 | 2023-11-28 | 苏州华星光电技术有限公司 | Display panel and driving method thereof |
| CN117935743A (en) * | 2024-03-22 | 2024-04-26 | 钰泰半导体股份有限公司 | Backlight light source partition dimming control method, circuit and LED driving chip |
| CN117935743B (en) * | 2024-03-22 | 2024-05-31 | 钰泰半导体股份有限公司 | Backlight light source partition dimming control method, circuit and LED driving chip |
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| CN117831473A (en) | 2024-04-05 |
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