CN101751875A - Liquid crystal display with adjustable backlight and implementation method thereof - Google Patents
Liquid crystal display with adjustable backlight and implementation method thereof Download PDFInfo
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- CN101751875A CN101751875A CN200810218157A CN200810218157A CN101751875A CN 101751875 A CN101751875 A CN 101751875A CN 200810218157 A CN200810218157 A CN 200810218157A CN 200810218157 A CN200810218157 A CN 200810218157A CN 101751875 A CN101751875 A CN 101751875A
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Abstract
The invention is suitable for the technical field of liquid crystal display, and provides liquid crystal display with an adjustable backlight and implementation method thereof. The method comprises the following steps of: a, detecting the light intensity of the environment located by the liquid crystal display; and b, controlling the backlight output voltage of the liquid crystal display based on a detection result. A technical scheme provided by the invention ensures that the liquid crystal display avoids energy source waste while guaranteeing the display effect, thereby achieving the effect of energy saving.
Description
Technical field
The invention belongs to technical field of liquid crystal display, relate in particular to a kind of adjustable LCD backlight and its implementation.
Background technology
LCD TV belongs to the backlight display device, and its liquid crystal itself is not luminous.There is backlight behind at liquid crystal display, and LCD TV is to go back original picture by evenly distributed tiny liquid crystal particle on the screen by the light that " blocking-up " and " opening " backlight sends.
In the existing LCD TV, as long as the LCD energized, backlight is just in work, even picture displayed is the black full picture of a width of cloth, backlight in work, that is to say that also the backlight of LCD TV is forever luminous.In addition, existing LCD TV can't be regulated the brightness of backlight automatically according to the size of ambient light line strength, that is, though day or night also no matter light be by force or a little less than, backlight is all with same brightness light yellow.In fact, the user by day or light when using LCD TV stronger the time does not need to use backlight usually, lights having little significance of backlight in this case.Except LCD TV, also there is same problem in other LCD.
But in fact, the power supply that the backlight liquid crystal display lamp is consumed accounts for the very big ratio of whole LCD power consumption, therefore, needs a kind of technical scheme, can so that backlight liquid crystal display brightness adjust automatically according to the intensity size of extraneous light, to save energy resource consumption.
Summary of the invention
The object of the present invention is to provide a kind of adjustable LCD backlight and its implementation, be intended to solve the problem that LCD TV backlight is adjusted.
Technical scheme provided by the invention is, a kind of adjustable LCD backlight, and described LCD comprises surround lighting detecting unit, voltage control unit backlight and voltage output unit backlight, wherein:
Described surround lighting detecting unit is used for the light intensity of detection LCD monitor environment of living in, and is used for testing result is transferred to described voltage control unit backlight;
Described voltage control unit backlight is used for generating control signal according to the testing result of described surround lighting detecting unit transmission, and this control signal is transferred to described voltage output unit backlight;
Described voltage output unit backlight is used for exporting voltage backlight and giving backlight according to the control signal of described voltage control unit output backlight.
Described surround lighting detecting unit comprises photoresistance, and described photoresistance is used for according to the light intensity size output voltage values of described LCD environment of living in.
Described control signal is the dutycycle of PWM.
Described voltage output unit backlight comprises switching tube (312), and described PWM dutycycle is used for controlling the ON time of described switching tube (312).
Described LCD is a lcd tv display.
The method that the present invention also provides a kind of liquid crystal display device backlight lightness to adjust, described method comprises:
The light intensity of a, detection LCD monitor environment of living in;
B, according to testing result control backlight liquid crystal display output voltage.
Wherein step a specifically comprises:
A1, measure the light intensity size of described LCD environment of living in and change by the change in resistance of photoresistance;
A2, the variation of described photoresistance resistance is converted to control signal outputs to described backlight liquid crystal display voltage output unit.
Wherein step b specifically comprises:
B1, described voltage output unit backlight output to described backlight according to the output voltage of described control signal adjustment to described LCD backlight lamp with adjusted output voltage;
B2, described backlight are luminous according to adjusted output voltage.
Described control signal is the dutycycle of PWM, and the dutycycle of described PWM is used for controlling the ON time of switching tube in the described voltage output unit backlight, thereby controls the output voltage of described voltage output unit backlight.
The present invention overcomes the deficiencies in the prior art, the residing surround lighting of LCD is detected, according to testing result to the backlight liquid crystal display lamp brightness control, when ambient light intensity becomes big, according to testing result liquid crystal display device backlight lightness is turned down, when ambient light intensity diminishes, liquid crystal display device backlight lightness is heightened according to testing result.Technical scheme provided by the invention makes LCD avoid the waste of the energy when guaranteeing display effect, has reached energy-conservation effect.
Description of drawings
Fig. 1 is an embodiment of the invention process flow diagram;
Fig. 2 is the schematic diagram of the LCD of the adjustable backlight brightness that provides of the embodiment of the invention;
Fig. 3 is that the liquid crystal display device backlight lightness that the embodiment of the invention provides is adjusted circuit diagram.
Embodiment
Technical scheme provided by the invention is: the residing surround lighting of LCD is detected, according to testing result to the backlight liquid crystal display lamp brightness control, when ambient light intensity is big, according to testing result liquid crystal display device backlight lightness is turned down, when ambient light intensity hour, according to testing result liquid crystal display device backlight lightness is heightened.
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The process flow diagram that the embodiment of the invention provides specifically comprises following step as shown in Figure 1:
1, LCD start detects its ambient light intensity of living in;
2, the light signal of the surround lighting that detection is obtained changes electric signal into, and this electric signal is transferred to the LCD backlight voltage follower circuit;
3, voltage follower circuit backlight is exported voltage backlight and is given the LCD backlight, with the brightness of control LCD backlight lamp.
The schematic diagram of the LCD of the adjustable backlight brightness that the embodiment of the invention provides as shown in Figure 2, comprise surround lighting detecting unit, voltage control unit backlight, voltage output unit backlight and backlight, in addition, the LCD that provides of the embodiment of the invention also comprises other functional parts (figure does not show) of available liquid crystal display.
Wherein, the surround lighting detecting unit links to each other with voltage control unit backlight, is used for the light intensity of detection LCD monitor environment of living in, and is used for testing result is transferred to voltage control unit backlight;
Voltage control unit backlight links to each other with voltage output unit backlight, is used for generating control signal according to the testing result of surround lighting detecting unit transmission, and this control signal is transferred to voltage output unit backlight;
Voltage output unit backlight links to each other with backlight, is used for control signal according to voltage control unit backlight output, exports voltage backlight and gives backlight.
Backlight is luminous according to the voltage backlight of voltage output unit transmission backlight.
Wherein, can adopt photo switches, photo sensors to the detection of ambient light intensity, as elements such as photoresistance, photodiode, phototransistor and photoelectric tubes.
Because photoresistance has negative resistance effect, promptly its resistance value can reduce with the increase of light intensity, and the surround lighting detecting unit comprises photoresistance in the embodiment of the invention, measures extraneous light intensity size and variation thereof by the resistance size variation of photoresistance.Voltage control unit backlight comprises amplifier 307, analogy/digital converter 30g and microprocessor 309, and voltage output unit backlight comprises switching tube (metal-oxide-semiconductor or triode) 312.
Shown in 3, the circuit diagram that the backlight liquid crystal display of the adjustable backlight brightness that provides for the embodiment of the invention is adjusted, when the LCD start, 302 one-tenth conducting states of switching tube, at this moment, node 303 voltages equal the voltage of impressed voltage 301.Wherein, photoresistance 306 is connected with resistance 304, is under the situation of high levle at node voltage 303, and the resistance value of photoresistance 306 will the corresponding change with the change of ambient light intensity, and this variation can be learnt by the change in voltage of node 305.The change in voltage of node 305 is amplified via operational amplifier 307, again by after 308 conversions of analogy/digital converter, input microprocessor 309 is to handle, can obtain the dutycycle of the pulse-width modulation (PWM) on the control end 311 of a switching tube 312, switching tube 311 is controlled its ON time according to this dutycycle, the average voltage of output is added on the backlight 313, promptly can control the brightness of backlight 313.Between resistance 304 and photoresistance 306 and power supply 301, add another switching tube 302, the break-make of coming regulating switch pipe 302 by the output control signal 310 of control microprocessor 309.
Because photoresistance 306 does not correspond to different resistance values simultaneously at ambient light intensity, when ambient light intensity becomes big, the resistance value of photoresistance 306 reduces, the dutycycle of pulse-width modulation PWM on the control end 311 of switching tube 312 diminishes, cause the ON time of switching tube 312 in the unit interval to reduce, therefore, the average voltage that is added on the backlight 313 reduces, so backlight 313 brightness reduce; When ambient light intensity diminishes, it is big that the resistance value of photoresistance 306 becomes, it is big that the dutycycle of pulse-width modulation PWM on the control end 311 of switching tube 312 becomes, cause the ON time of switching tube 312 in the unit interval to increase, therefore, the average voltage that is added on the backlight 313 becomes big, so backlight 313 brightness become big.
As mentioned above, by detection to the residing ambient light intensity of LCD, the brightness that can control the LCD backlight lamp changes with the variation of ambient light intensity, when ambient light intensity is big, brightness of backlight reduces, when ambient light intensity hour, it is big that brightness of backlight becomes, can guarantee the effect that shows, save the energy resource consumption of LCD simultaneously again.
The present invention utilizes the opto-electronic conversion effect, will be converted to electric signal to ambient light intensity, and cooperates simple circuit to realize the adjustment of LCD TV backlight lamp.This kind dynamically adjusted the method for LCD TV backlight lamp brightness, can further reach the low power consumption requirement in the LCD design now.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an adjustable LCD backlight is characterized in that, described LCD comprises surround lighting detecting unit, voltage control unit backlight and voltage output unit backlight, wherein:
Described surround lighting detecting unit is used for the light intensity of detection LCD monitor environment of living in, and is used for testing result is transferred to described voltage control unit backlight;
Described voltage control unit backlight is used for generating control signal according to the testing result of described surround lighting detecting unit transmission, and this control signal is transferred to described voltage output unit backlight;
Described voltage output unit backlight is used for exporting voltage backlight and giving backlight according to the control signal of described voltage control unit output backlight.
2. LCD according to claim 1 is characterized in that, described surround lighting detecting unit comprises photoresistance, and described photoresistance is used for according to the light intensity size output voltage values of described LCD environment of living in.
3. LCD according to claim 1 is characterized in that, described control signal is the dutycycle of PWM.
4. LCD according to claim 3 is characterized in that, described voltage output unit backlight comprises switching tube (312), and described PWM dutycycle is used for controlling the ON time of described switching tube (312).
5. LCD according to claim 1 is characterized in that, described LCD is a lcd tv display.
6. the method adjusted of a liquid crystal display device backlight lightness, described method comprises:
The light intensity of a, detection LCD monitor environment of living in;
B, according to testing result control backlight liquid crystal display output voltage.
7. method according to claim 6 is characterized in that, wherein step a specifically comprises:
A1, measure the light intensity size of described LCD environment of living in and change by the change in resistance of photoresistance;
A2, the variation of described photoresistance resistance is converted to control signal outputs to described backlight liquid crystal display voltage output unit.
8. method according to claim 7 is characterized in that, wherein step b specifically comprises:
B1, described voltage output unit backlight output to described backlight according to the output voltage of described control signal adjustment to described LCD backlight lamp with adjusted output voltage;
B2, described backlight are luminous according to adjusted output voltage.
9. method according to claim 7, it is characterized in that, described control signal is the dutycycle of PWM, and the dutycycle of described PWM is used for controlling the ON time of switching tube in the described voltage output unit backlight, thereby controls the output voltage of described voltage output unit backlight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810218157A CN101751875A (en) | 2008-12-12 | 2008-12-12 | Liquid crystal display with adjustable backlight and implementation method thereof |
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| CN200810218157A CN101751875A (en) | 2008-12-12 | 2008-12-12 | Liquid crystal display with adjustable backlight and implementation method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543001A (en) * | 2011-12-15 | 2012-07-04 | 无锡中星微电子有限公司 | Backlight source brightness regulation method, system and device |
| CN103151009A (en) * | 2013-02-26 | 2013-06-12 | 深圳市华星光电技术有限公司 | Backlight dimming circuit and dimming method thereof as well as liquid crystal display |
| CN103886840A (en) * | 2014-03-05 | 2014-06-25 | 美的集团股份有限公司 | Display screen brightness control device, air conditioner and method for controlling display screen brightness |
| CN104167193A (en) * | 2014-05-29 | 2014-11-26 | 友达光电股份有限公司 | Signal conversion method for display image |
| CN104464687A (en) * | 2014-10-30 | 2015-03-25 | 广东欧珀移动通信有限公司 | Method and device for adjusting backlight value of mobile terminal |
| CN105224110A (en) * | 2015-10-22 | 2016-01-06 | 上海斐讯数据通信技术有限公司 | A kind of multifunctional mouse and input system, input method |
| CN105513561A (en) * | 2014-09-25 | 2016-04-20 | 鸿富锦精密工业(武汉)有限公司 | Display screen brightness adjusting system |
| CN106504725A (en) * | 2015-09-07 | 2017-03-15 | 江苏清投视讯科技有限公司 | A kind of rear-projection brightness control unit based on automatic detection |
| CN107433900A (en) * | 2017-08-20 | 2017-12-05 | 芜湖乐普汽车科技有限公司 | A kind of automobile instrument panel |
| CN108877739A (en) * | 2013-11-20 | 2018-11-23 | 华为终端（东莞）有限公司 | A kind of method, apparatus and electronic equipment of adjusting backlight luminance |
| CN109256087A (en) * | 2018-10-23 | 2019-01-22 | 深圳市华星光电技术有限公司 | Display device, pixel-driving circuit and its driving method |
| CN109509438A (en) * | 2018-12-28 | 2019-03-22 | 惠科股份有限公司 | Backlight driving assembly, backlight module and display device |
| CN112660019A (en) * | 2021-01-15 | 2021-04-16 | 奇瑞汽车股份有限公司 | Automobile audio host interface display system and method and automobile |
| CN115691368A (en) * | 2022-11-10 | 2023-02-03 | 武汉华之洋科技有限公司 | Fault monitoring and backlight control function board for liquid crystal display |
-
2008
- 2008-12-12 CN CN200810218157A patent/CN101751875A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543001A (en) * | 2011-12-15 | 2012-07-04 | 无锡中星微电子有限公司 | Backlight source brightness regulation method, system and device |
| CN103151009A (en) * | 2013-02-26 | 2013-06-12 | 深圳市华星光电技术有限公司 | Backlight dimming circuit and dimming method thereof as well as liquid crystal display |
| CN103151009B (en) * | 2013-02-26 | 2015-08-26 | 深圳市华星光电技术有限公司 | A kind of backlight dimming circuit and light-dimming method, liquid crystal display |
| CN108877739A (en) * | 2013-11-20 | 2018-11-23 | 华为终端（东莞）有限公司 | A kind of method, apparatus and electronic equipment of adjusting backlight luminance |
| CN108877739B (en) * | 2013-11-20 | 2020-11-06 | 华为终端有限公司 | Method and device for adjusting backlight brightness and electronic equipment |
| CN108877692A (en) * | 2013-11-20 | 2018-11-23 | 华为终端（东莞）有限公司 | A kind of method, apparatus and electronic equipment of adjusting backlight luminance |
| CN103886840A (en) * | 2014-03-05 | 2014-06-25 | 美的集团股份有限公司 | Display screen brightness control device, air conditioner and method for controlling display screen brightness |
| CN104167193A (en) * | 2014-05-29 | 2014-11-26 | 友达光电股份有限公司 | Signal conversion method for display image |
| CN105513561A (en) * | 2014-09-25 | 2016-04-20 | 鸿富锦精密工业(武汉)有限公司 | Display screen brightness adjusting system |
| CN104464687A (en) * | 2014-10-30 | 2015-03-25 | 广东欧珀移动通信有限公司 | Method and device for adjusting backlight value of mobile terminal |
| CN104464687B (en) * | 2014-10-30 | 2016-11-30 | 广东欧珀移动通信有限公司 | The backlight value method of adjustment of a kind of mobile terminal and device |
| CN106504725A (en) * | 2015-09-07 | 2017-03-15 | 江苏清投视讯科技有限公司 | A kind of rear-projection brightness control unit based on automatic detection |
| CN105224110A (en) * | 2015-10-22 | 2016-01-06 | 上海斐讯数据通信技术有限公司 | A kind of multifunctional mouse and input system, input method |
| CN107433900A (en) * | 2017-08-20 | 2017-12-05 | 芜湖乐普汽车科技有限公司 | A kind of automobile instrument panel |
| CN109256087A (en) * | 2018-10-23 | 2019-01-22 | 深圳市华星光电技术有限公司 | Display device, pixel-driving circuit and its driving method |
| CN109256087B (en) * | 2018-10-23 | 2020-12-04 | 深圳市华星光电技术有限公司 | Display device, pixel driving circuit and driving method thereof |
| CN109509438A (en) * | 2018-12-28 | 2019-03-22 | 惠科股份有限公司 | Backlight driving assembly, backlight module and display device |
| CN112660019A (en) * | 2021-01-15 | 2021-04-16 | 奇瑞汽车股份有限公司 | Automobile audio host interface display system and method and automobile |
| CN115691368A (en) * | 2022-11-10 | 2023-02-03 | 武汉华之洋科技有限公司 | Fault monitoring and backlight control function board for liquid crystal display |
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Application publication date: 20100623 |