CN114495846B - Display variable frequency dimming method and variable frequency dimming display - Google Patents

Display variable frequency dimming method and variable frequency dimming display Download PDF

Info

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
Authority
CN
China
Prior art keywords
display
frequency
backlight
dimming
variable frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210157706.3A
Other languages
Chinese (zh)
Other versions
CN114495846A (en
Inventor
潘进于
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TPV Electronic Technology Fujian Co Ltd
Original Assignee
TPV Electronic Technology Fujian Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TPV Electronic Technology Fujian Co Ltd filed Critical TPV Electronic Technology Fujian Co Ltd
Priority to CN202210157706.3A priority Critical patent/CN114495846B/en
Publication of CN114495846A publication Critical patent/CN114495846A/en
Application granted granted Critical
Publication of CN114495846B publication Critical patent/CN114495846B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Display variable frequency dimming method and variable frequency dimming display
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.
CN202210157706.3A 2022-02-21 2022-02-21 Display variable frequency dimming method and variable frequency dimming display Active CN114495846B (en)

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
CN114495846A CN114495846A (en) 2022-05-13
CN114495846B true CN114495846B (en) 2024-05-14

Family

ID=81482421

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210157706.3A Active CN114495846B (en) 2022-02-21 2022-02-21 Display variable frequency dimming method and variable frequency dimming display

Country Status (1)

Country Link
CN (1) CN114495846B (en)

Citations (12)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (13)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CN114495846A (en) 2022-05-13

Similar Documents

Publication Publication Date Title
JP4117074B2 (en) Liquid crystal display
CN107591131B (en) Backlight driving method and device
US8044922B1 (en) Backlight dimming and LCD amplitude boost
CN100358004C (en) Image display apparatus and image display method
CN103413539B (en) A kind of backlight drive control method, control device and display device
US20090284545A1 (en) Display apparatus, display control method, and display control program
WO2011004520A1 (en) Liquid crystal display device and method for controlling display of liquid crystal display device
US20090015602A1 (en) Contrast Ratio Enhancement System Using Asymmetrically Delayed Illumination Control
WO2006008903A1 (en) Display device and method, recording medium, and program
JP2009075550A (en) High dynamic contrast processing device and processing method for liquid crystal display device
KR102654419B1 (en) Image data processing apparatus and display device for implementing local dimming
JP4969135B2 (en) Image adjustment method
KR101073006B1 (en) Display device and method for controling brightness of images in display device
KR20140107936A (en) Luminance adjusting part, display apparatus having the same and method of adjusting luminance using the same
CN101587698A (en) Display apparatus, display control method, and display control program
JP5139623B2 (en) Image display device
CN105810156A (en) Backlight adjustment method and circuit
WO2018047973A1 (en) Control device and liquid crystal display device provided with control device
CN114495846B (en) Display variable frequency dimming method and variable frequency dimming display
KR100801627B1 (en) Display apparatus and control method thereof
US20090267530A1 (en) Backlight module for displays
CN1467700A (en) Brightness regulating method and equipment for LCD
JP4686901B2 (en) Backlight dimmer
CN201584141U (en) Device improving dynamic contrast of liquid crystal display
Stessen et al. 26.4: Algorithm for contrast reserve, backlight dimming, and backlight boosting on LCD

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant