CN114495846A - Display frequency conversion dimming method and frequency conversion dimming display - Google Patents

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

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Publication number
CN114495846A
CN114495846A CN202210157706.3A CN202210157706A CN114495846A CN 114495846 A CN114495846 A CN 114495846A CN 202210157706 A CN202210157706 A CN 202210157706A CN 114495846 A CN114495846 A CN 114495846A
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CN
China
Prior art keywords
display
frequency
backlight
dimming
frequency conversion
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Pending
Application number
CN202210157706.3A
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Chinese (zh)
Inventor
潘进于
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TPV Electronic Technology Fujian Co Ltd
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TPV Electronic Technology Fujian Co Ltd
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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/CN114495846A/en
Publication of CN114495846A publication Critical patent/CN114495846A/en
Pending legal-status Critical Current

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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

Abstract

The invention relates to a display frequency conversion dimming method and a frequency conversion dimming display, which adopt DC modulation and comprise the following steps: s1, powering on a display; s2, judging whether the dynamic backlight of the display is turned on by a system chip of the display, if so, modulating the backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3; s3, a 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 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.

Description

Display frequency conversion dimming method and frequency conversion 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
The existing display backlight brightness adjustment adopts two modes of combined dimming, 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 in a light blue picture due to the low frequency PWM adjustment, the image quality of a product is influenced, and the experience feeling of the product is reduced, the low brightness cannot be adjusted too low due to the influence of the characteristics of a backlight adjustment IC due to the high frequency DC adjustment, the Duty is 30% or less, 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 on a display;
s2, judging whether the dynamic backlight of the display is turned on by a system chip of the display, if so, modulating the backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3;
s3, the system chip of the display reads the backlight setting 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 20 Khz.
A variable-frequency dimming display is provided, and the variable-frequency dimming method of the display is applied.
Compared with the prior art, the invention has the following beneficial effects: the high-frequency DC and the low-frequency DC are adopted to jointly modulate the backlight of the display, the brightness and the darkness of the backlight are directly adjusted by controlling the voltage, screen flicker is avoided, and the problems that the low-frequency PWM adjustment is adopted, the horizontal stripe interference is easy to occur in a light blue picture, and the low brightness cannot be adjusted too low due to the influence of the characteristics of a backlight adjustment IC on the high-frequency DC adjustment are solved.
Drawings
The accompanying drawings, which are described herein to provide a further understanding of the application, are included in the following description:
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
Referring to fig. 1, in the variable frequency dimming method for a display according to the embodiment, DC modulation is adopted, and the following technical scheme is adopted: the method comprises the following steps:
s1, powering on a display;
s2, judging whether the dynamic backlight of the display is turned on by a system chip of the display, if so, modulating the backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3;
s3, the system chip of the display reads the backlight setting 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 20 Khz.
A variable-frequency dimming display is provided, and the variable-frequency dimming method of the display is applied.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A display frequency conversion dimming method adopts DC modulation, and is characterized in that: the method comprises the following steps:
s1, powering on a display;
s2, judging whether the dynamic backlight of the display is turned on by a system chip of the display, if so, modulating the backlight adjusting signal by using low-frequency DC, otherwise, carrying out S3;
s3, the system chip of the display reads the backlight setting 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.
2. The method of claim 1, wherein: the dimming frequency of the low-frequency DC is 120hz, and the dimming frequency of the high-frequency DC is 20 Khz.
3. A kind of frequency conversion adjusts the light display, characterized by: use of the method of variable frequency dimming of a display according to claims 1-2.
CN202210157706.3A 2022-02-21 2022-02-21 Display frequency conversion dimming method and frequency conversion dimming display Pending CN114495846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210157706.3A CN114495846A (en) 2022-02-21 2022-02-21 Display frequency conversion dimming method and frequency conversion dimming display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210157706.3A CN114495846A (en) 2022-02-21 2022-02-21 Display frequency conversion dimming method and frequency conversion dimming display

Publications (1)

Publication Number Publication Date
CN114495846A true CN114495846A (en) 2022-05-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210157706.3A Pending CN114495846A (en) 2022-02-21 2022-02-21 Display frequency conversion dimming method and frequency conversion dimming display

Country Status (1)

Country Link
CN (1) CN114495846A (en)

Citations (14)

* 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
US20160117997A1 (en) * 2013-05-29 2016-04-28 Nec Display Solutions, Ltd. Display device, and display device control 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
US20170374718A1 (en) * 2016-06-22 2017-12-28 Cree, Inc. Dimming control for led-based luminaires
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

Patent Citations (15)

* 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
US20160117997A1 (en) * 2013-05-29 2016-04-28 Nec Display Solutions, Ltd. Display device, and display device control method
US20170374718A1 (en) * 2016-06-22 2017-12-28 Cree, Inc. Dimming control for led-based luminaires
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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