CN114495846B - Display variable frequency dimming method and variable frequency dimming display - Google Patents
Display variable frequency dimming method and variable frequency dimming display Download PDFInfo
- Publication number
- CN114495846B CN114495846B CN202210157706.3A CN202210157706A CN114495846B CN 114495846 B CN114495846 B CN 114495846B CN 202210157706 A CN202210157706 A CN 202210157706A CN 114495846 B CN114495846 B CN 114495846B
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- display
- frequency
- backlight
- dimming
- variable frequency
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- 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
- G09G3/3413—Details of control of colour illumination sources
-
- 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
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
Abstract
The invention relates to a display variable frequency dimming method and a variable frequency dimming display, which adopt DC modulation and comprise the following steps: s1, powering up a display; s2, judging whether the dynamic backlight of the display is turned on or not by a system chip of the display, if so, modulating a backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3; s3, the system chip of the display reads a backlight set value, if the backlight adjustment Duty of the backlight is greater than 40%, the backlight adjustment signal is modulated by high-frequency DC, and when the backlight adjustment Duty is less than 40%, the backlight adjustment signal is modulated by low-frequency DC, and the brightness of the backlight is directly adjusted by variable-frequency DC modulation by adopting the technical scheme, so that screen flicker is avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display variable-frequency dimming method and a variable-frequency dimming display.
Background
At present, the backlight brightness of a display is adjusted by adopting two modes in a combined mode, namely PWM adjustment is adopted at low frequency (120 Hz), DC adjustment is adopted at high frequency (20 Khz), horizontal stripe interference is easy to occur on a bluish picture when the low frequency adopts PWM adjustment, the image quality of a product is influenced, the experience of the product is reduced, the low brightness cannot be adjusted too low when the high frequency adopts DC adjustment and is influenced by the characteristics of a backlight adjustment IC, the Duty is not effective under 30%, and the Duty of the low frequency PWM adjustment can be less than 10%.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a display variable frequency dimming method which directly adjusts the brightness of backlight through variable frequency DC modulation and does not cause screen flicker.
The invention relates to a display variable frequency dimming method, which adopts DC modulation and adopts the following technical scheme: the method comprises the following steps:
S1, powering up a display;
s2, judging whether the dynamic backlight of the display is turned on or not by a system chip of the display, if so, modulating a backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3;
S3, the system chip of the display reads the backlight set value, if the backlight adjustment Duty of the backlight is greater than 40%, the backlight adjustment signal uses high-frequency DC modulation, and if the backlight adjustment Duty is less than 40%, the backlight adjustment signal uses low-frequency DC modulation.
Further, the dimming frequency of the low frequency DC is 120hz, and the dimming frequency of the high frequency DC is 20Khz.
A frequency conversion dimming display, which applies the frequency conversion dimming method of the display.
Compared with the prior art, the invention has the following beneficial effects: the backlight of the display is modulated by combining high-frequency DC and low-frequency DC, the brightness of the backlight is directly regulated by controlling the voltage, screen flicker is avoided, and the problems that horizontal stripe interference is easy to occur on a light blue picture when the low-frequency PWM is adopted for regulating, and the low brightness cannot be regulated too low when the high-frequency DC is adopted for regulating is influenced by the characteristics of a backlight regulating IC are avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and/or provide a further understanding of the application, and wherein:
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
Referring to fig. 1, a variable frequency dimming method for a display according to an embodiment adopts DC modulation, and adopts the following technical scheme: the method comprises the following steps:
S1, powering up a display;
s2, judging whether the dynamic backlight of the display is turned on or not by a system chip of the display, if so, modulating a backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3;
S3, the system chip of the display reads the backlight set value, if the backlight adjustment Duty of the backlight is greater than 40%, the backlight adjustment signal uses high-frequency DC modulation, and if the backlight adjustment Duty is less than 40%, the backlight adjustment signal uses low-frequency DC modulation.
Further, the dimming frequency of the low frequency DC is 120hz, and the dimming frequency of the high frequency DC is 20Khz.
A frequency conversion dimming display, which applies the frequency conversion dimming method of the display.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A display variable frequency dimming method adopts DC modulation, which is characterized in that: the method comprises the following steps:
S1, powering up a display;
s2, judging whether the dynamic backlight of the display is turned on or not by a system chip of the display, if so, modulating a backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3;
s3, the system chip of the display reads a backlight set value, if the backlight adjustment Duty of the backlight is more than 40%, the backlight adjustment signal uses high-frequency DC modulation, and if the backlight adjustment Duty is less than 40%, the backlight adjustment signal uses low-frequency DC modulation; wherein the dimming frequency of the low-frequency DC is 120hz, and the dimming frequency of the high-frequency DC is 20Khz.
2. A variable frequency dimming display, characterized by: use of the variable frequency dimming method of a display of claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210157706.3A CN114495846B (en) | 2022-02-21 | 2022-02-21 | Display variable frequency dimming method and variable frequency dimming display |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210157706.3A CN114495846B (en) | 2022-02-21 | 2022-02-21 | Display variable frequency dimming method and variable frequency dimming display |
Publications (2)
Publication Number | Publication Date |
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CN114495846A CN114495846A (en) | 2022-05-13 |
CN114495846B true CN114495846B (en) | 2024-05-14 |
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CN202210157706.3A Active CN114495846B (en) | 2022-02-21 | 2022-02-21 | Display variable frequency dimming method and variable frequency dimming display |
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Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH075439A (en) * | 1993-06-14 | 1995-01-10 | Sumitomo Electric Ind Ltd | Light control element and driving method therefor |
JP2000148072A (en) * | 1998-11-04 | 2000-05-26 | Casio Comput Co Ltd | Liquid crystal display device |
JP2007258459A (en) * | 2006-03-23 | 2007-10-04 | Alpine Electronics Inc | Led backlight driving device |
KR20080002622A (en) * | 2006-06-30 | 2008-01-04 | 엘지.필립스 엘시디 주식회사 | Method and apparatus of driving lamp |
JP2009180934A (en) * | 2008-01-30 | 2009-08-13 | Sharp Corp | Liquid crystal display device |
CN101650921A (en) * | 2009-09-17 | 2010-02-17 | 青岛海信电器股份有限公司 | Method and device of controlling dynamic backlight |
CN102356696A (en) * | 2009-03-20 | 2012-02-15 | Nxp股份有限公司 | Method of controlling an led, and an led controller |
CN102708801A (en) * | 2012-06-06 | 2012-10-03 | 天津三星电子有限公司 | Backlight brightness control method for display terminal and display terminal adopting same |
CN103280190A (en) * | 2013-05-20 | 2013-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
CN107424572A (en) * | 2017-06-12 | 2017-12-01 | 青岛海信电器股份有限公司 | A kind of display drive method, device and display |
CN113035135A (en) * | 2019-12-09 | 2021-06-25 | 厦门雅迅网络股份有限公司 | Numerical control backlight adjusting circuit and method based on vehicle running state |
CN113838429A (en) * | 2021-09-24 | 2021-12-24 | 合肥京东方光电科技有限公司 | Backlight driving method and system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014192099A1 (en) * | 2013-05-29 | 2014-12-04 | Necディスプレイソリューションズ株式会社 | Display device, and display device control method |
US9967944B2 (en) * | 2016-06-22 | 2018-05-08 | Cree, Inc. | Dimming control for LED-based luminaires |
-
2022
- 2022-02-21 CN CN202210157706.3A patent/CN114495846B/en active Active
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH075439A (en) * | 1993-06-14 | 1995-01-10 | Sumitomo Electric Ind Ltd | Light control element and driving method therefor |
JP2000148072A (en) * | 1998-11-04 | 2000-05-26 | Casio Comput Co Ltd | Liquid crystal display device |
JP2007258459A (en) * | 2006-03-23 | 2007-10-04 | Alpine Electronics Inc | Led backlight driving device |
KR20080002622A (en) * | 2006-06-30 | 2008-01-04 | 엘지.필립스 엘시디 주식회사 | Method and apparatus of driving lamp |
JP2009180934A (en) * | 2008-01-30 | 2009-08-13 | Sharp Corp | Liquid crystal display device |
CN102356696A (en) * | 2009-03-20 | 2012-02-15 | Nxp股份有限公司 | Method of controlling an led, and an led controller |
CN101650921A (en) * | 2009-09-17 | 2010-02-17 | 青岛海信电器股份有限公司 | Method and device of controlling dynamic backlight |
CN102708801A (en) * | 2012-06-06 | 2012-10-03 | 天津三星电子有限公司 | Backlight brightness control method for display terminal and display terminal adopting same |
CN103280190A (en) * | 2013-05-20 | 2013-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
WO2014187005A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display apparatus, and backlight driving method |
CN107424572A (en) * | 2017-06-12 | 2017-12-01 | 青岛海信电器股份有限公司 | A kind of display drive method, device and display |
CN113035135A (en) * | 2019-12-09 | 2021-06-25 | 厦门雅迅网络股份有限公司 | Numerical control backlight adjusting circuit and method based on vehicle running state |
CN113838429A (en) * | 2021-09-24 | 2021-12-24 | 合肥京东方光电科技有限公司 | Backlight driving method and system |
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CN114495846A (en) | 2022-05-13 |
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