CN109256098B - Driving method, driving device and display device - Google Patents
Driving method, driving device and display device Download PDFInfo
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- CN109256098B CN109256098B CN201811397665.5A CN201811397665A CN109256098B CN 109256098 B CN109256098 B CN 109256098B CN 201811397665 A CN201811397665 A CN 201811397665A CN 109256098 B CN109256098 B CN 109256098B
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- backlight source
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- crystal display
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a driving method, a driving device and a display device, belongs to the technical field of display, and can at least partially solve the problem of screen flashing of the existing liquid crystal display device. The driving method of the present invention is used for driving a backlight source for providing backlight for a liquid crystal display panel, and includes: step S1, acquiring parameters of a frame period of a current displayed picture of the liquid crystal display panel, wherein the parameters represent the duration of the frame period, and the parameters are dynamic variation values; step S2, determining the corresponding brightness of the backlight source according to the obtained parameter of the frame period and a preset rule.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a driving method, a driving device and a display device.
Background
When the existing liquid crystal display device is used for displaying, in some application scenarios (such as G-Sync), the calculation time required for images of different frames is different, which causes the duration of the frame period for displaying each frame of image to be dynamically changed. One frame period generally includes a scan phase in which progressive scanning of the liquid crystal display panel is completed and a hold phase in which the liquid crystal display panel holds the data voltage to which it is written. The duration of the scanning phase in each frame period is fixed, which is convenient for the design of the liquid crystal display panel and the corresponding driving device, while the duration of the holding phase is dynamically adjustable according to the duration of the frame period. In the holding phase, the data voltage stored in the lcd panel may change due to the leakage current, which may cause the brightness displayed by each sub-pixel of the lcd panel to change. Because the duration of the holding phase in each frame period is different, the brightness displayed by the sub-pixels in each frame period has different degrees of change, which easily causes the phenomenon of screen flashing of the display picture.
Disclosure of Invention
The invention at least partially solves the problem of the splash screen of the existing liquid crystal display device and provides a driving method, a driving device and a display device.
According to a first aspect of the present invention, there is provided a driving method for driving a backlight for providing a backlight for a liquid crystal display panel, the driving method comprising: step S1, acquiring parameters of a frame period of a current displayed picture of the liquid crystal display panel, wherein the parameters represent the duration of the frame period, and the parameters are dynamic variation values; step S2, determining the corresponding brightness of the backlight source according to the obtained parameter of the frame period and a preset rule.
Optionally, the liquid crystal display panel is normally white, and the predetermined rule includes: and if the corresponding frame period is longer, the corresponding brightness of the backlight source is lower.
Optionally, the liquid crystal display panel is a normally black type, and the predetermined rule includes: and if the corresponding frame period is longer, the corresponding brightness of the backlight source is higher.
Optionally, the parameter includes a number of line periods included in each frame period, and the line periods when the liquid crystal display panel displays are equal in length.
Optionally, the determining the corresponding brightness of the backlight source comprises: and determining the duty ratio of a backlight source control signal, wherein the backlight source control signal is a square wave signal, the first level of the square wave signal is used for controlling the backlight source to be turned on, and the second level of the square wave signal is used for controlling the backlight source to be turned off.
Optionally, when the parameter includes a number of line periods included in each frame period, the duty ratio of the first level in the square wave signal is linear with the number of line periods.
Optionally, step S3 is further included after the step S2: and driving the backlight source to emit light with corresponding brightness according to the brightness determined in the step S2.
According to a second aspect of the present invention, there is provided a driving apparatus for driving a backlight for backlighting a liquid crystal display panel, the driving apparatus comprising: the device comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring parameters of a frame period of a current displayed picture of the liquid crystal display panel, the parameters represent the duration of the frame period, and the parameters are dynamic change values; the determining unit is used for determining the corresponding brightness of the backlight source according to the acquired parameters of the frame period and a preset rule; and the driving unit is used for driving the backlight source to emit light with corresponding brightness according to the brightness determined by the determining unit.
According to a third aspect of the present invention, there is provided a driving apparatus for driving a backlight for providing backlight for a liquid crystal display panel, the driving apparatus comprising a memory storing instructions and a processor for executing the instructions to perform the driving method according to the first aspect of the present invention.
According to a fourth aspect of the present invention, there is provided a display device comprising a backlight source and a liquid crystal display panel, the backlight source being for providing backlight to the liquid crystal display panel, the display device further comprising a driving device for driving the backlight source, the driving device being the driving device according to the second or third aspect of the present invention.
Drawings
Fig. 1 is a flowchart of a driving method according to an embodiment of the invention.
Fig. 2 is a block diagram of a driving apparatus according to an embodiment of the invention.
Fig. 3 is a block diagram of another driving apparatus according to an embodiment of the present invention.
The reference signs are: 101. an acquisition unit; 102. a determination unit; 103. a drive unit; 401. a memory; 402. a processor.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
referring to fig. 1, the present embodiment provides a driving method for driving a backlight source, where the backlight source is used to provide backlight for a liquid crystal display panel. The driving method includes the following steps.
Step S1, obtaining a parameter of a frame period of a currently displayed frame of the liquid crystal display panel, where the parameter represents a duration of the frame period, and the parameter is a dynamic change value.
That is, the duration of each frame is dynamically changed when the liquid crystal display panel is displaying. The parameters characterizing the duration are, for example, the duration of the frame period and the frame rate. In one case, when a certain lcd panel is driven to display, the duration of the line period is fixed, and the number of line periods (also called Vblk number) included in one frame period can be used to represent the duration of the frame period.
And step S2, determining the corresponding brightness of the backlight source according to the acquired parameters of the frame period and the preset rules.
I.e. the brightness of the light emitted by the backlight, is also dynamically adjusted, depending on parameters including the frame period. Each frame period typically consists of two parts, a refresh phase and a subsequent hold phase. The pixel voltage is written into the storage capacitor in each sub-pixel of the liquid crystal display panel in the refreshing stage, and the magnitude of the voltage determines the transmittance of the sub-pixel. In this holding period, the intensity of the light transmitted by the lcd panel depends on the voltage stored in the storage capacitor in each sub-pixel, and the voltage is attenuated by the leakage current over time, which causes the intensity of the light transmitted by each sub-pixel to change. For a given lcd panel, the duration of the refresh phase within each frame period is usually fixed, and the duration of the frame period directly reflects the duration of the hold phase. The duration of the hold period reflects the magnitude or magnitude of the change in intensity emitted by each sub-pixel. Therefore, the light emitted by the backlight source can be adjusted so as to compensate the change of the light penetrating through the liquid crystal display panel in the holding stage caused by leakage current, and further the problem of screen flashing of a display picture is suppressed.
In one case, the lcd panel is normally white, and light transmitted through the lcd panel tends to increase due to the leakage current in the sustain period. In this case, then, the predetermined rule includes: corresponding to the display frame with longer duration of the frame period, the corresponding brightness of the backlight source is lower. That is, for two frame periods with different durations, the longer the duration of the frame period is, the weaker the light emitted by the backlight source during the frame period correspondingly.
In another case, the lcd panel is normally black, and in the sustain period, the light passing through the lcd panel tends to decrease due to the leakage current. In this case, then, the predetermined rule includes: corresponding to a display frame with longer duration of the frame period, the corresponding brightness of the backlight source is higher. That is, for two frame periods with different durations, the longer the duration of the frame period is, the stronger the light emitted by the backlight source within the time of the frame period is correspondingly.
The adjustment of the brightness of the backlight source may be to adjust the absolute brightness of light emitted by the backlight source by adjusting the driving current or driving voltage thereof. Another method is to adjust the backlight source to be alternately turned on and off. The method comprises the following specific steps: and determining the duty ratio of a backlight source control signal, wherein the backlight source control signal (also called PWM signal) is a square wave signal, the first level of the square wave signal is used for controlling the backlight source to be turned on, and the second level of the square wave signal is used for controlling the backlight source to be turned off. This way the adjustment of the backlight brightness is more accurate and controllable.
Optionally, when the parameter includes a number of line periods included in each frame period, the duty ratio of the first level in the square wave signal is linear with the number of line periods.
That is, as a simple mathematical model, the duration of the line period is considered to be linear with respect to the time of the lit state in the square wave signal. Of course, one skilled in the art can use a nonlinear relationship or a piecewise linear relationship to simulate the relationship between the two as a specific means for adjusting the brightness of the backlight.
For example, when the refresh frequency of the liquid crystal display panel is 60Hz, the number of row periods included in each frame period is 2000, when the refresh frequency of the liquid crystal display panel is 144Hz, each frame period includes 100 row periods, and it is specified that the duration corresponding to the first level in the square wave signal is reduced by 1% of the duration of the first level in the square wave signal at the refresh frequency of 144Hz every 100 line periods included in one frame period are increased relative to the case of 144 Hz.
Optionally, step S3 is further included after step S2: the backlight is driven to emit light of a corresponding luminance according to the luminance determined in step S2.
I.e. after determining how bright the backlight should emit light, the backlight is driven to emit light of a corresponding brightness.
Example 2:
referring to fig. 2, the present embodiment provides a driving apparatus for driving a backlight source, the backlight source being used for providing backlight for a liquid crystal display panel, the driving apparatus including: the acquiring unit 101 is configured to acquire a parameter of a frame period of a currently displayed frame of the liquid crystal display panel, where the parameter represents a duration of the frame period, and the parameter is a dynamic change value; a determining unit 102, configured to determine, according to the obtained parameter of the frame period and according to a preset rule, corresponding luminance of the backlight source; and a driving unit 103 for driving the backlight source to emit light with corresponding brightness according to the brightness determined by the determining unit.
The acquisition unit 101 includes, for example, a port for communicating with, for example, an image processing unit (GPU). The determination unit 102 includes, for example, a calculation circuit. The drive unit 103 includes, for example, an isolated output circuit and the like.
The operation mechanism of each unit is described in example 1, and the specific circuit form is not limited.
Example 3:
referring to fig. 3, the present embodiment provides a driving apparatus for driving a backlight source, where the backlight source is used to provide backlight for a liquid crystal display panel, the driving apparatus includes a memory 401 and a processor 402, where the memory 401 stores instructions, and the processor 402 is used to execute the instructions to execute the driving method according to embodiment 1 of the present invention.
Specifically, the memory 401 is a device capable of storing instructions, such as a Random Access Memory (RAM) or a Read Only Memory (ROM). The processor 402 is a device such as a Central Processing Unit (CPU) that performs arithmetic and control.
Example 4:
this embodiment provides a display device, which includes a backlight source and a liquid crystal display panel, where the backlight source is used to provide backlight for the liquid crystal display panel, and the display device further includes a driving device for driving the backlight source, and the driving device is the driving device according to embodiment 2 or embodiment 3 of the present invention.
Specifically, the display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A driving method for driving a backlight for backlighting a liquid crystal display panel, the driving method comprising:
step S1, acquiring parameters of a frame period of a current displayed picture of the liquid crystal display panel, wherein the parameters represent the duration of the frame period, and the parameters are dynamic variation values; the parameters comprise the number of line periods contained in each frame period, and the line periods when the liquid crystal display panel displays are equal in length;
step S2, determining the corresponding brightness of the backlight source according to the acquired parameters of the frame period and a preset rule;
the determining the corresponding brightness of the backlight source comprises: and determining the duty ratio of a backlight source control signal, wherein the backlight source control signal is a square wave signal, a first level of the square wave signal is used for controlling the backlight source to be turned on, a second level of the square wave signal is used for controlling the backlight source to be turned off, and the duty ratio of the first level in the square wave signal is in a linear relation with the line period number.
2. The driving method according to claim 1, wherein the liquid crystal display panel is normally white, and the preset rule comprises: and if the corresponding frame period is longer, the corresponding brightness of the backlight source is lower.
3. The driving method according to claim 1, wherein the liquid crystal display panel is normally black, and the preset rule comprises: and if the corresponding frame period is longer, the corresponding brightness of the backlight source is higher.
4. The driving method according to claim 1, further comprising, after the step S2, a step S3: and driving the backlight source to emit light with corresponding brightness according to the brightness determined in the step S2.
5. A driving apparatus for driving a backlight for backlighting a liquid crystal display panel, the driving apparatus comprising:
the device comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring parameters of a frame period of a current displayed picture of the liquid crystal display panel, the parameters represent the duration of the frame period, and the parameters are dynamic change values; the parameters comprise the number of line periods contained in each frame period, and the line periods when the liquid crystal display panel displays are equal in length;
the determining unit is used for determining the corresponding brightness of the backlight source according to the acquired parameters of the frame period and a preset rule; the determining the corresponding brightness of the backlight source comprises: determining the duty ratio of a backlight source control signal, wherein the backlight source control signal is a square wave signal, a first level of the square wave signal is used for controlling the backlight source to be turned on, a second level of the square wave signal is used for controlling the backlight source to be turned off, and the duty ratio of the first level in the square wave signal is in a linear relation with the line period number;
and the driving unit is used for driving the backlight source to emit light with corresponding brightness according to the brightness determined by the determining unit.
6. A driving apparatus for driving a backlight for backlighting a liquid crystal display panel, the driving apparatus comprising a memory storing instructions and a processor for executing the instructions to perform the driving method according to any of claims 1-4.
7. A display device comprising a backlight source and a liquid crystal display panel, wherein the backlight source is used for providing backlight for the liquid crystal display panel, and the display device further comprises a driving device for driving the backlight source, and the driving device is the driving device according to claim 5 or 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811397665.5A CN109256098B (en) | 2018-11-22 | 2018-11-22 | Driving method, driving device and display device |
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| CN201811397665.5A CN109256098B (en) | 2018-11-22 | 2018-11-22 | Driving method, driving device and display device |
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| CN109256098A CN109256098A (en) | 2019-01-22 |
| CN109256098B true CN109256098B (en) | 2021-01-26 |
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| CN112419976B (en) * | 2020-09-30 | 2022-04-12 | Tcl华星光电技术有限公司 | Driving method of display device and display device |
| CN112863419B (en) * | 2021-01-27 | 2022-12-23 | 重庆惠科金渝光电科技有限公司 | Display device driving method, display device, and computer-readable storage medium |
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| CN1573893A (en) * | 2003-05-29 | 2005-02-02 | Lg电子株式会社 | Apparatus and method for controlling inverter pulse width modulation frequency in LCD in portable computer |
| CN1650219A (en) * | 2002-07-19 | 2005-08-03 | 三星电子株式会社 | A liquid crystal display |
| CN1656528A (en) * | 2002-05-28 | 2005-08-17 | 皇家飞利浦电子股份有限公司 | Motion blur decrease by varying duty cycle |
| CN1842834A (en) * | 2003-08-27 | 2006-10-04 | 皇家飞利浦电子股份有限公司 | Display device |
| CN106205497A (en) * | 2015-04-29 | 2016-12-07 | 青岛海信电器股份有限公司 | A kind of method for controlling backlight thereof, device and liquid crystal indicator |
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- 2018-11-22 CN CN201811397665.5A patent/CN109256098B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1656528A (en) * | 2002-05-28 | 2005-08-17 | 皇家飞利浦电子股份有限公司 | Motion blur decrease by varying duty cycle |
| CN1650219A (en) * | 2002-07-19 | 2005-08-03 | 三星电子株式会社 | A liquid crystal display |
| CN1573893A (en) * | 2003-05-29 | 2005-02-02 | Lg电子株式会社 | Apparatus and method for controlling inverter pulse width modulation frequency in LCD in portable computer |
| CN1842834A (en) * | 2003-08-27 | 2006-10-04 | 皇家飞利浦电子股份有限公司 | Display device |
| CN106205497A (en) * | 2015-04-29 | 2016-12-07 | 青岛海信电器股份有限公司 | A kind of method for controlling backlight thereof, device and liquid crystal indicator |
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