CN101609657A - A kind of LCD backlight control method and device - Google Patents
A kind of LCD backlight control method and device Download PDFInfo
- Publication number
- CN101609657A CN101609657A CN 200910151489 CN200910151489A CN101609657A CN 101609657 A CN101609657 A CN 101609657A CN 200910151489 CN200910151489 CN 200910151489 CN 200910151489 A CN200910151489 A CN 200910151489A CN 101609657 A CN101609657 A CN 101609657A
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- voltage
- backlight
- voltage signal
- display
- temperature
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a kind of LCD backlight control method, comprising: the temperature of obtaining display environment of living in is voltage signal U with this temperature transition also
0Utilize voltage to ask poor scale operation circuit to described voltage signal U
0Be converted to voltage signal U
1With the voltage signal U after the conversion
1Be input to backlight drive circuit, utilize described voltage signal U
1The backlight illumination of control display.The present invention also provides a kind of backlight liquid crystal display control device.Can realize the self-adaptation adjusting of backlight illumination according to the present invention, to reduce the temperature of display device, make display regulate brightness of display screen based on environmental aspect, improve the display effect of display screen, also reduce simultaneously the heating degree of display screen, thereby prolonged the purpose of machine life.
Description
Technical field
The present invention relates to the display technology field, be specifically related to LCD backlight control method and device.
Background technology
Industrial production automation equipment is equipped with display screen usually, and these display screens are used for display device state and operation control as man-machine interface, and these display screens are a kind of embedded computer products.LCD is little with its volume, and is in light weight, and display frame is advantage more clearly, is used as man-machine interface widely.
The display technique of LCD is different from other displays.Liquid lens element wherein itself there is no the characteristics of luminescence, and needing provides display pannel required light source by a backlight module.The required light source of LCDs (LCD) is to utilize to drive with high-voltage cold-cathode fluorescent tube (CCFL), makes light be projected to backlight, reaches the purpose of display image.When external environment changed, the user tended to because backlight illumination does not see the picture displaying contents inadequately.Therefore, be necessary to provide a backlight illumination regulon, to adapt to the use of varying environment.
Because the environment for use temperature of engineering machinery is higher, and display screen inside has heater members, be easy to because spend the serviceable life of heat affecting display screen.The heat of display screen mainly is that backlight comes out, and therefore, can reach the purpose of protection display screen by controlling the display screen temperature that reduces backlight.
The control method of a kind of display screen temperature that provides in the prior art, be to detect display screen temperature by temperature detecting unit, there is central processing unit that this temperature signal is compared the driving electric size that decides cold cathode fluorescent lamp with preset reference temperature, makes the temperature of display screen be lower than or remain on predetermined reference temperature.The shortcoming of prior art is to need to adopt processor control too complicated, and cost is higher.
Summary of the invention
The embodiment of the invention provides a kind of LCD backlight control method and device, can realize that the self-adaptation of backlight illumination is regulated, and reduces the temperature of display.
The embodiment of the invention provides a kind of LCD backlight control method, comprising:
The temperature of obtaining display environment of living in is voltage signal U with this temperature transition also
0
Utilize voltage to ask poor scale operation circuit to described voltage signal U
0Be converted to voltage signal U
1
With the voltage signal U after the conversion
1Be input to backlight drive circuit, utilize described voltage signal U
1The backlight illumination of control display.
The embodiment of the invention provides a kind of backlight liquid crystal display control device, comprising:
Temperature sensor is used to obtain the temperature of display environment of living in and is voltage signal U with this temperature transition
0
Voltage conversion unit utilizes voltage to ask poor scale operation circuit to described voltage signal U
0Change the voltage signal U after the output conversion
1Give backlight drive circuit;
The backlight drive control module utilizes the voltage signal U after the described conversion
1The backlight illumination of control display.
Ground preferably, this backlight control apparatus also comprises:
Input block is used to import backlight control information;
Processing unit is used to receive the backlight control information from described input block, and voltage is controlled in output and control command is given voltage-adjusting unit, and is used to indicate switch unit to switch;
Voltage-adjusting unit is adjusted the control voltage from described processing unit according to described control command, and adjusted voltage is input to the backlight drive control module;
The backlight drive control module utilizes the backlight illumination of the control Control of Voltage display of described voltage-adjusting unit output.
In the technical scheme that the invention described above embodiment provides, utilize magnitude of voltage that temperature sensor testing environment temperature obtains its output again after changing the backlight control voltage to LCD regulate, realize the self-adaptation adjusting of backlight illumination, to reduce the temperature of display device, make the display device variation of temperature that conforms.Or realize the adjusting of backlight illumination by artificial input control information.The present invention is simple, the low such user of cost can select to regulate automatically and manual adjustments backlight so that display can be regulated brightness of display screen based on environmental aspect, the display effect of raising display screen, also reduce simultaneously the heating degree of display screen, thereby prolonged the purpose of machine life.
Description of drawings
Fig. 1 is the method for controlling backlight thereof process flow diagram of the display that provides in the embodiment of the invention;
Fig. 2 is the voltage transitions principle schematic in the embodiment of the invention;
The backlight control apparatus Organization Chart of a kind of display that Fig. 3 embodiment of the invention provides.
Embodiment
The invention provides a kind of can the adjusting the backlight of display based on environment temperature, specifically be utilize magnitude of voltage that temperature sensor testing environment temperature obtains its output again after changing the backlight control voltage to LCD regulate, realize the self-adaptation adjusting of backlight illumination, can realize reducing complete machine temperature by adjusting backlight simultaneously, complete machine is operated under the suitable environment.Or the manually adjusting of input control information realization backlight illumination.Like this user can select automatically to regulate and manual adjustments backlight so that display is regulated brightness of display screen based on environmental aspect, improve the display effect of display screen, also reduced the heating degree of display screen simultaneously, thereby the purpose of prolongation machine life.
With reference to Fig. 1, a kind of LCD backlight control method that the embodiment of the invention provides comprises:
S01, the temperature of obtaining display environment of living in is voltage signal U with this temperature transition also
0
Particularly, Temperature Detector is set, as temperature sensor near display;
This Temperature Detector detects the temperature of described display environment of living in and based on this temperature output voltage signal U
0
S02 utilizes voltage to ask poor scale operation circuit to described voltage signal U
0Be converted to voltage signal U
1
With reference to Fig. 2, utilize temperature detecting module to detect voltage U of environment temperature output of display screen
0, this magnitude of voltage by voltage transitions (specifically can adopt voltage to ask poor scale operation circuit) to voltage U
0Be converted to a control voltage, be used to control the LCD backlight illumination.With voltage U
0Be input to voltage and ask poor scale operation circuit, voltage is asked a LCD control of poor scale operation circuit output voltage U
1
With voltage signal U
0With the negative pole that is linked into operational amplifier by resistance R 1, reference voltage V
0Be linked into the positive pole of operational amplifier;
Output voltage signal U after described operational amplifier amplifies
1
U
1＝(R2/R1)(V
0-U
0)
Wherein R2 is connected the negative pole of operational amplifier and the resistance between the output terminal.
Suppose reference voltage V
0Be 5V, U
1=(R2/R1) (5-U
0), can to resistance R 2, R1 be configured make output magnitude of voltage in suitable scope, LCD controls voltage U
1With the temperature detection output voltage U
0Increase and reduce, with U
0Reduce and increase, promptly when temperature raises, reduce LCD brightness backlight, improve the brightness of display screen when temperature is recovered, make the variation that conforms of its backlight illumination.
S03 is with the voltage signal U after the conversion
1Be input to backlight drive circuit, utilize described voltage signal U
1The backlight illumination of control display.
With the voltage signal U after the conversion
1Be input to backlight drive circuit.Because LCD control voltage U
1With the temperature detection output voltage U
0Increase and reduce, with U
0Reduce and increase, promptly when temperature raises, reduce LCD brightness backlight, improve the brightness of display screen when temperature is recovered, make the variation that conforms of its backlight illumination.Can realize control like this to the LCD backlight illumination.
LCD backlight drive control module is a voltage inversion unit, and (0～5V) changes, and the brightness of different LCD backlight driving voltage with the backlight lamp tube of control LCD is exported in inversion with the control voltage signal of importing.
With reference to Fig. 3, the embodiment of the invention also provides a kind of backlight control apparatus 300 of display, comprising:
Backlight drive control module 33 utilizes the voltage signal U after the described conversion
1The backlight illumination of control display.
Wherein, voltage conversion unit 32 comprises:
Operational amplifier is used for reference voltage V
0With described voltage signal U
0Difference amplify and obtain output voltage signal U
1:
U
1＝(R2/R1)(V
0-U
0)
Wherein R1 is the resistance between the negative pole that connects temperature sensor output terminal and operational amplifier, and R2 is connected the negative pole of operational amplifier and the resistance between the output terminal.
Voltage-adjusting unit 36 is adjusted the control voltage from described processing unit according to described control command, and adjusted voltage is input to the backlight drive control module;
Backlight drive control module 33 utilizes the backlight illumination of the control Control of Voltage display of described voltage-adjusting unit 36 outputs.
Particularly, the backlight drive control module is a voltage inversion unit, can produce a high voltage so that driver element is lighted the CCFL fluorescent tube of liquid crystal display.The input end interface of this driver element mainly contain voltage, with the input of brightness regulation voltage etc., can utilize to change the input of brightness regulation voltage to regulate the brightness of display backlight.
Particularly, input block 34 adopts keyboard input module, processing unit 35 processor modules, and voltage-adjusting unit 36 adopts digital regulation resistance.
Keyboard input module, branch raise and reduce by two buttons, and on behalf of brightness, the one-touch input raise or reduced a grade, the output voltage values of control figure potentiometer, and with control LCD backlight driving unit, thus the backlight illumination of adjusting LCD.Simultaneously, the controlling value of manual adjustments can be accessed in the memory access, and next time is when starting shooting, if the manual adjustments pattern is then lighted the backlight of display screen with previously stored brightness value.
In the technical scheme that the invention described above embodiment provides, utilize magnitude of voltage that temperature sensor testing environment temperature obtains its output again after changing the backlight control voltage to LCD regulate, realize the self-adaptation adjusting of backlight illumination, to reduce the temperature of display device, make the display device variation of temperature that conforms.Or realize the adjusting of backlight illumination by artificial input control information.The present invention is simple, the low such user of cost can select to regulate automatically and manual adjustments backlight so that display can be regulated brightness of display screen based on environmental aspect, the display effect of raising display screen, also reduce simultaneously the heating degree of display screen, thereby prolonged the purpose of machine life.
The above is the preferred embodiments of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (7)
1, a kind of LCD backlight control method is characterized in that, comprising:
The temperature of obtaining display environment of living in is voltage signal U with this temperature transition also
0
Utilize voltage to ask poor scale operation circuit to described voltage signal U
0Be converted to voltage signal U
1
With the voltage signal U after the conversion
1Be input to backlight drive circuit, utilize described voltage signal U
1The backlight illumination of control display.
2, method for controlling backlight thereof as claimed in claim 1 is characterized in that, the described temperature of obtaining display environment of living in is a voltage signal with this temperature transition also, specifically comprises:
Temperature sensor is set near display;
The temperature of the described display of this temperature sensor senses environment of living in and based on this temperature output voltage signal U
0
3, method for controlling backlight thereof as claimed in claim 1 is characterized in that, utilizes voltage to ask poor scale operation circuit that described voltage signal is changed, and specifically comprises:
With voltage signal U
0With the negative pole that is linked into operational amplifier by resistance R 1, reference voltage V
0Be linked into the positive pole of operational amplifier;
Output voltage signal U after described operational amplifier amplifies
1
U
1＝(R2/R1)(V
0-U
0)
Wherein R2 is connected the negative pole of operational amplifier and the resistance between the output terminal.
4, a kind of backlight liquid crystal display control device is characterized in that, comprising:
Temperature sensor is used to obtain the temperature of display environment of living in and is voltage signal U with this temperature transition
0
Voltage conversion unit utilizes voltage to ask poor scale operation circuit to described voltage signal U
0Change the voltage signal U after the output conversion
1Give backlight drive circuit;
The backlight drive control module utilizes the voltage signal U after the described conversion
1The backlight illumination of control display.
5, backlight control apparatus as claimed in claim 4 is characterized in that, described voltage conversion unit comprises:
Operational amplifier is used for reference voltage V
0With described voltage signal U
0Difference amplify and obtain output voltage signal U
1,
U
1＝(R2/R1)(V
0-U
0)
Wherein R1 is the resistance between the negative pole that connects temperature sensor output terminal and operational amplifier, and R2 is connected the negative pole of operational amplifier and the resistance between the output terminal.
6, backlight control apparatus as claimed in claim 4 is characterized in that, also comprises:
Input block is used to import backlight control information;
Processing unit is used to receive the backlight control information from described input block, and voltage is controlled in output and control command is given voltage-adjusting unit, and is used to indicate switch unit to switch;
Voltage-adjusting unit is adjusted the control voltage from described processing unit according to described control command, and adjusted voltage is input to the backlight drive control module;
The backlight drive control module utilizes the backlight illumination of the control Control of Voltage display of described voltage-adjusting unit output.
7, backlight control apparatus as claimed in claim 4 is characterized in that, also comprises:
Switch unit is connected with described voltage conversion unit, described voltage-adjusting unit and backlight drive control module respectively, is used for switching according to the indication of described processor, with the voltage signal U of described voltage conversion unit output
1Be input to described backlight drive control module one of in the control voltage of described voltage-adjusting unit output.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910151489 CN101609657B (en) | 2009-07-23 | 2009-07-23 | Method and device for controlling backlight of liquid crystal display |
| PCT/CN2010/074464 WO2011009364A1 (en) | 2009-07-23 | 2010-06-25 | Method and device for controlling backlight of liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910151489 CN101609657B (en) | 2009-07-23 | 2009-07-23 | Method and device for controlling backlight of liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101609657A true CN101609657A (en) | 2009-12-23 |
| CN101609657B CN101609657B (en) | 2011-12-28 |
Family
ID=41483385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910151489 Active CN101609657B (en) | 2009-07-23 | 2009-07-23 | Method and device for controlling backlight of liquid crystal display |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101609657B (en) |
| WO (1) | WO2011009364A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011009364A1 (en) * | 2009-07-23 | 2011-01-27 | 湖南三一智能控制设备有限公司 | Method and device for controlling backlight of liquid crystal display |
| CN103414832A (en) * | 2013-08-30 | 2013-11-27 | 深圳市中兴移动通信有限公司 | Method and device for adjusting screen luminance of terminal |
| CN105280147A (en) * | 2015-10-15 | 2016-01-27 | 珠海格力电器股份有限公司 | Display control method and control system |
| CN105609057A (en) * | 2015-12-30 | 2016-05-25 | 中航华东光电有限公司 | Method for preventing high temperature liquefaction of LCD screen |
| CN105741716A (en) * | 2014-12-12 | 2016-07-06 | 环旭电子股份有限公司 | Display device and backlight intensity adjustment method thereof |
| CN106855792A (en) * | 2015-12-09 | 2017-06-16 | 小米科技有限责任公司 | A kind of terminal with display function |
| CN111016798A (en) * | 2019-12-18 | 2020-04-17 | 宁波峰梅视讯电子有限公司 | Temperature control method for stream media rearview mirror |
| CN111524488A (en) * | 2020-04-13 | 2020-08-11 | 广东天波信息技术股份有限公司 | Self-adaptive adjustment method and device for preventing display screen from overheating |
| CN112181017A (en) * | 2020-09-17 | 2021-01-05 | 武汉海微科技有限公司 | Temperature protection algorithm based on vehicle-mounted display screen |
Families Citing this family (1)
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|---|---|---|---|---|
| TWI575505B (en) * | 2012-03-29 | 2017-03-21 | 天鈺科技股份有限公司 | Electronic device and method for adjusting luminance of a display unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100497378B1 (en) * | 2003-01-04 | 2005-06-23 | 삼성전자주식회사 | Apparatus and method for display |
| CN1763592A (en) * | 2004-10-22 | 2006-04-26 | 南京Lg同创彩色显示***有限责任公司 | Liquid crystal display capable of automatically adjusting brightness |
| JP2006351319A (en) * | 2005-06-15 | 2006-12-28 | Fujitsu Ten Ltd | Luminance control method, luminance control unit, and display |
| KR20070079455A (en) * | 2006-02-02 | 2007-08-07 | 삼성전자주식회사 | Back-light unit having a plurality of luminous element and control method thereof |
| CN200962169Y (en) * | 2006-06-19 | 2007-10-17 | 深圳市新超亮特种显示设备有限公司 | A wide-temperature high bright LCD |
| JP2008040488A (en) * | 2006-07-12 | 2008-02-21 | Toshiba Matsushita Display Technology Co Ltd | Liquid crystal display device |
| CN101609657B (en) * | 2009-07-23 | 2011-12-28 | 三一重工股份有限公司 | Method and device for controlling backlight of liquid crystal display |
-
2009
- 2009-07-23 CN CN 200910151489 patent/CN101609657B/en active Active
-
2010
- 2010-06-25 WO PCT/CN2010/074464 patent/WO2011009364A1/en active Application Filing
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011009364A1 (en) * | 2009-07-23 | 2011-01-27 | 湖南三一智能控制设备有限公司 | Method and device for controlling backlight of liquid crystal display |
| CN103414832A (en) * | 2013-08-30 | 2013-11-27 | 深圳市中兴移动通信有限公司 | Method and device for adjusting screen luminance of terminal |
| CN103414832B (en) * | 2013-08-30 | 2017-03-29 | 努比亚技术有限公司 | Adjust the method and device of screen luminance of terminal |
| CN105741716A (en) * | 2014-12-12 | 2016-07-06 | 环旭电子股份有限公司 | Display device and backlight intensity adjustment method thereof |
| CN105280147A (en) * | 2015-10-15 | 2016-01-27 | 珠海格力电器股份有限公司 | Display control method and control system |
| CN106855792A (en) * | 2015-12-09 | 2017-06-16 | 小米科技有限责任公司 | A kind of terminal with display function |
| CN105609057A (en) * | 2015-12-30 | 2016-05-25 | 中航华东光电有限公司 | Method for preventing high temperature liquefaction of LCD screen |
| CN111016798A (en) * | 2019-12-18 | 2020-04-17 | 宁波峰梅视讯电子有限公司 | Temperature control method for stream media rearview mirror |
| CN111524488A (en) * | 2020-04-13 | 2020-08-11 | 广东天波信息技术股份有限公司 | Self-adaptive adjustment method and device for preventing display screen from overheating |
| CN111524488B (en) * | 2020-04-13 | 2021-05-11 | 广东天波信息技术股份有限公司 | Self-adaptive adjustment method and device for preventing display screen from overheating |
| CN112181017A (en) * | 2020-09-17 | 2021-01-05 | 武汉海微科技有限公司 | Temperature protection algorithm based on vehicle-mounted display screen |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011009364A1 (en) | 2011-01-27 |
| CN101609657B (en) | 2011-12-28 |
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