CN101789218A - Light-adjusting method of light-emitting diode backlight - Google Patents
Light-adjusting method of light-emitting diode backlight Download PDFInfo
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- CN101789218A CN101789218A CN201010101894A CN201010101894A CN101789218A CN 101789218 A CN101789218 A CN 101789218A CN 201010101894 A CN201010101894 A CN 201010101894A CN 201010101894 A CN201010101894 A CN 201010101894A CN 101789218 A CN101789218 A CN 101789218A
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Abstract
The invention discloses a light-adjusting method of light-emitting diode (LED) backlight. The method comprises the following steps: successively connecting a photosensitive device, an analog-to-digital converter, an impulse width modulation generator and a light-adjusting loop to form a self-adapting light-adjusting loop; using the photosensitive device to convert the sensed environmental light intensity to a voltage; using the analog-to-digital converter to quantize the voltage to a digital signal; using the impulse width modulation generator to generate a corresponding duty ratio pulse signal according to the quantized digital signal, and transmitting the pulse signal to the PWM pin of an IC of the light-adjusting loop to turn on/off a AC boost switching circuit under a set frequency and automatically adjust the LED brightness. The invention has the advantage that the monitor can adaptively change the backlight intensity according to the change of the light intensity of use environment so as to reduce the discomfort of eyes caused by too high or too low brightness; and the user can adaptively open or close adaptive options through a menu according to own demand.
Description
Technical field
The present invention relates to a kind of light-dimming method backlight, is a kind of light-emitting diode display light-dimming method backlight specifically.
Background technology
The light modulation principle of light-emitting diode display is at present: a certain duty cycle signals that uses about 200Hz, modulate the switch of module backlight, by adjusting different dutycycles, make the different brightness of output, by the menu manual adjustment, regulate brightness 0 ~ 100% by OSD, correspond to 8bit after the computed in software and be quantified as 0 ~ 256 rank, circuit takes place in the PWM that quantized signal is transferred to MICOM inside, the scalable duty cycle pulse signal of output certain frequency (about 200Hz).As shown in Figure 1, PWM control IC is controlled by duty cycle signals, make voltage boosting dc change-over circuit (boostconverter) carry out switch, so just make the module backlight of display constantly move in the open and close pattern, thereby carry out the control of backlight illumination with certain frequency (about 200Hz).
The method that traditional monitor is regulated brightness mostly is menu control, and the percentage of promptly regulating in the menu is twice recently controlled display backlight brightness.When work in common LED model backlight in existing light modulation loop, regulate brightness and need realize, so just can not make display change backlight intensity, and can bring discomfort to human eye according to the environment for use intensity variations by the menu adjustment.
Summary of the invention
In order to overcome the deficiencies in the prior art, the purpose of this invention is to provide a kind of light-emitting diode display light-dimming method backlight easy and simple to handle, this light-dimming method can make display brightness change automatically along with the change of environment.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: the light-dimming method that a kind of light-emitting diode display is backlight, this method comprises the steps:
1) photosensitive device, analog to digital converter, pulse width modulation generator and light modulation loop are connected to form self-adaptation light modulation loop successively;
2) by photosensitive device the environmental light intensity of sensing is changed into voltage;
3) by analog to digital converter with step 2) described in voltage change into digital signal;
4) produce corresponding duty cycle pulse signal by pulse width modulation generator according to the digital signal after quantizing, this pulse signal is transferred to the PWM pin of IC in the light modulation loop, make the DC boosting change-over circuit carry out switch, thereby carry out the adjusting of LED brightness automatically with setpoint frequency.
At first the environmental light intensity of sensing is changed into voltage among the present invention, by analog to digital converter voltage is changed into digital signal then, promptly voltage is carried out 8bit and quantize (256 rank) by photosensitive device; Analog to digital converter (PWM) produces corresponding duty cycle pulse signal according to the digital signal after quantizing, this pulse signal is transferred to the PWM pin of IC in the light modulation loop, make voltage boosting dc change-over circuit (boost converter) carry out switch with certain frequency (about 200Hz), so just make the LED backlight of display constantly move in the open and close pattern, and according to the difference of induced voltage, PWM generator produces the signal of different duty, thereby carries out the control of LED brightness automatically.
When common LED model backlight is worked, regulate brightness and need realize by the menu adjustment.After the present invention used self-adaptation light modulation loop, photosensitive device can be judged the different LED working current of back output according to the environment for use in the external world, makes display brightness change automatically along with the change of environment.
Compared with prior art, advantage of the present invention is that display can be according to the environment for use intensity variations, and adaptive variation backlight intensity is to reduce the discomfort that too high or low excessively brightness brings to human eye; The user can open, close the self-adaptation option by menu according to self-demand simultaneously, opens the expression backlight illumination in the self-adaptation option and regulates, closes expression manual adjustments backlight illumination automatically according to ambient brightness.
Description of drawings
Fig. 1 is the workflow diagram of prior art;
Fig. 2 is a workflow diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, a kind of light-emitting diode display of the present invention light-dimming method backlight at first connects to form self-adaptation light modulation loop successively with photosensitive device, analog to digital converter, pulse width modulation generator and light modulation loop; This photosensitive device can be judged the different LED operating voltage of back output according to the light intensity of extraneous environment for use, then by analog to digital converter with voltage change into digital signal and with this digital data transmission to pulse width modulation generator, pulse width modulation generator produces corresponding duty cycle pulse signal according to the digital signal after quantizing, this pulse signal is transferred to the PWM pin of IC in the light modulation loop, make the DC boosting change-over circuit carry out switch with about 200Hz frequency, so just make the LED backlight of display constantly open, move in the pattern of pass, and according to the difference of induced voltage, PWM generator produces the signal of different duty, thereby carries out the control of LED brightness automatically.
The above only is a preferred implementation of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the principle of the invention, can also make some modification and improvement, these also should be considered as belonging to protection scope of the present invention.
Claims (1)
1. the light-dimming method that light-emitting diode display is backlight is characterized in that this method comprises the steps:
1) photosensitive device, analog to digital converter, pulse width modulation generator and light modulation loop are connected to form self-adaptation light modulation loop successively;
2) by photosensitive device the environmental light intensity of sensing is changed into voltage;
3) by analog to digital converter with step 2) described in voltage change into digital signal;
4) produce corresponding duty cycle pulse signal by pulse width modulation generator according to the digital signal after quantizing, this pulse signal is transferred to the PWM pin of IC in the light modulation loop, make the DC boosting change-over circuit carry out switch, thereby carry out the adjusting of LED brightness automatically with setpoint frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010101894A CN101789218A (en) | 2010-01-26 | 2010-01-26 | Light-adjusting method of light-emitting diode backlight |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010101894A CN101789218A (en) | 2010-01-26 | 2010-01-26 | Light-adjusting method of light-emitting diode backlight |
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| CN101789218A true CN101789218A (en) | 2010-07-28 |
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| CN201010101894A Pending CN101789218A (en) | 2010-01-26 | 2010-01-26 | Light-adjusting method of light-emitting diode backlight |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522907A (en) * | 2011-11-25 | 2012-06-27 | 保定天威集团有限公司 | Imitation screen power supply with adjustable three-level |
| CN103021319A (en) * | 2012-12-24 | 2013-04-03 | 广东威创视讯科技股份有限公司 | Screen energy-saving display method and screen energy-saving display device |
| CN103390383A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Control system of light-sensitive LED display screen |
| CN103453617A (en) * | 2013-04-24 | 2013-12-18 | 海尔集团公司 | Air conditioner and display method implemented by display screen of air conditioner |
| CN104361880A (en) * | 2014-11-06 | 2015-02-18 | 河南机电高等专科学校 | Automatic laptop screen dimming system |
| CN104464650A (en) * | 2014-12-29 | 2015-03-25 | 合肥宝龙达光电技术有限公司 | Automatic control system and method for display brightness |
| CN105575364A (en) * | 2015-12-22 | 2016-05-11 | 惠州Tcl移动通信有限公司 | Intelligent watch and brightness adaptive adjusting system and method |
| CN105702229A (en) * | 2016-02-17 | 2016-06-22 | 惠州Tcl移动通信有限公司 | Mobile terminal backlight brightness adjusting method and system and mobile terminal |
| CN108447440A (en) * | 2018-03-05 | 2018-08-24 | 江苏威尔曼科技有限公司 | A kind of matrix display and its control method of adaption brightness |
| CN109859721A (en) * | 2019-04-02 | 2019-06-07 | Oppo广东移动通信有限公司 | Brightness of display screen adjusting method, device, mobile terminal and storage medium |
| US10672348B2 (en) | 2017-11-21 | 2020-06-02 | Asustek Computer Inc. | Display device and drive method thereof |
| CN113824319A (en) * | 2020-06-19 | 2021-12-21 | 瑞昱半导体股份有限公司 | Optical receiver device, pulse width modulator circuit system and sensitivity control method |
| WO2022041074A1 (en) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | Backlight apparatus control system for head-mounted device, and terminal |
| CN114779992A (en) * | 2022-04-07 | 2022-07-22 | 深圳市松冠科技有限公司 | Display menu control method, device, equipment and storage medium |
| CN115240605A (en) * | 2022-07-25 | 2022-10-25 | 英华达（南京）科技有限公司 | Display control method, display system, device, and storage medium |
| CN116129820A (en) * | 2023-01-29 | 2023-05-16 | 合肥京东方显示技术有限公司 | Backlight plate driving method and display screen |
-
2010
- 2010-01-26 CN CN201010101894A patent/CN101789218A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522907B (en) * | 2011-11-25 | 2013-11-13 | 保定天威集团有限公司 | Imitation screen power supply with adjustable three-level |
| CN102522907A (en) * | 2011-11-25 | 2012-06-27 | 保定天威集团有限公司 | Imitation screen power supply with adjustable three-level |
| CN103390383A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Control system of light-sensitive LED display screen |
| CN103390383B (en) * | 2012-05-11 | 2015-09-16 | 四川优的科技有限公司 | The control system of light-sensitive LED display screen |
| CN103021319A (en) * | 2012-12-24 | 2013-04-03 | 广东威创视讯科技股份有限公司 | Screen energy-saving display method and screen energy-saving display device |
| CN103021319B (en) * | 2012-12-24 | 2016-02-24 | 广东威创视讯科技股份有限公司 | A kind of saving energy of screen display packing and device |
| CN103453617B (en) * | 2013-04-24 | 2016-08-31 | 海尔集团公司 | Air-conditioning and the display methods of air conditioner display screen |
| CN103453617A (en) * | 2013-04-24 | 2013-12-18 | 海尔集团公司 | Air conditioner and display method implemented by display screen of air conditioner |
| CN104361880A (en) * | 2014-11-06 | 2015-02-18 | 河南机电高等专科学校 | Automatic laptop screen dimming system |
| CN104464650A (en) * | 2014-12-29 | 2015-03-25 | 合肥宝龙达光电技术有限公司 | Automatic control system and method for display brightness |
| CN105575364A (en) * | 2015-12-22 | 2016-05-11 | 惠州Tcl移动通信有限公司 | Intelligent watch and brightness adaptive adjusting system and method |
| CN105702229A (en) * | 2016-02-17 | 2016-06-22 | 惠州Tcl移动通信有限公司 | Mobile terminal backlight brightness adjusting method and system and mobile terminal |
| CN105702229B (en) * | 2016-02-17 | 2019-01-29 | 惠州Tcl移动通信有限公司 | A kind of backlight brightness adjusting method, system and mobile terminal |
| US10672348B2 (en) | 2017-11-21 | 2020-06-02 | Asustek Computer Inc. | Display device and drive method thereof |
| CN108447440A (en) * | 2018-03-05 | 2018-08-24 | 江苏威尔曼科技有限公司 | A kind of matrix display and its control method of adaption brightness |
| CN109859721A (en) * | 2019-04-02 | 2019-06-07 | Oppo广东移动通信有限公司 | Brightness of display screen adjusting method, device, mobile terminal and storage medium |
| CN113824319A (en) * | 2020-06-19 | 2021-12-21 | 瑞昱半导体股份有限公司 | Optical receiver device, pulse width modulator circuit system and sensitivity control method |
| WO2022041074A1 (en) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | Backlight apparatus control system for head-mounted device, and terminal |
| CN114779992A (en) * | 2022-04-07 | 2022-07-22 | 深圳市松冠科技有限公司 | Display menu control method, device, equipment and storage medium |
| CN115240605A (en) * | 2022-07-25 | 2022-10-25 | 英华达（南京）科技有限公司 | Display control method, display system, device, and storage medium |
| CN116129820A (en) * | 2023-01-29 | 2023-05-16 | 合肥京东方显示技术有限公司 | Backlight plate driving method and display screen |
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Open date: 20100728 |