CN1996103A - Energy-saving circuit for use in liquid crystal display - Google Patents
Energy-saving circuit for use in liquid crystal display Download PDFInfo
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- CN1996103A CN1996103A CN 200610062231 CN200610062231A CN1996103A CN 1996103 A CN1996103 A CN 1996103A CN 200610062231 CN200610062231 CN 200610062231 CN 200610062231 A CN200610062231 A CN 200610062231A CN 1996103 A CN1996103 A CN 1996103A
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Abstract
The energy saving circuit for LCD comprises a luminance sensing module, adjusting circuit connected between the luminance sensing module and the aphototropic light source, with the luminance sensing module inspecting the environment or image luminance and sending out to the said adjusting circuit, which send out changeable voltage to aphototropic light source based on the luminance value. The voltage of input aphototropic light source dynamically changes with the luminance of the environment and the image. Compared with existing technique, it can save energy. It can provide image with comfort for consumers to look at.
Description
Technical field
The present invention relates to a kind of energy-saving circuit, particularly relate to a kind of energy-saving circuit that is used for LCD.
Background technology
Owing to have advantages such as frivolous, radiationless, be accompanied by the large-scale production of liquid crystal panel and the decline of cost, LCD is widely used.But liquid crystal can not autoluminescence, need utilize backlight luminous.The input end of the backlight of available liquid crystal display generally is connected to the Constant Direct Current high voltage, and power consumption is very big, and when showing the higher image of some brightness, can bring dazzling sensation to the user.
Summary of the invention
Technical matters to be solved by this invention is the defective that remedies above-mentioned prior art, proposes a kind of energy-saving circuit that is used for LCD, to reduce energy consumption.
Technical matters of the present invention is solved by the following technical programs:
A kind of energy-saving circuit that is used for LCD also comprises brightness impression module, regulating circuit.
Described regulating circuit is connected between brightness impression module and the backlight, and the brightness value of described brightness impression module detection of dynamic environment or image also exports described regulating circuit to, and the described regulating circuit voltage that output changes according to brightness value is to backlight.
Technical matters of the present invention is further solved by the following technical programs:
Described regulating circuit is CPU, and the brightness output brightness value of described brightness impression module detection of dynamic image is to described CPU, and the pwm signal that described CPU output duty cycle changes is to backlight.
Described brightness impression module is the image display chip that possesses the dynamic brightness measuring ability, is used for the brightness value of detection of dynamic image to be displayed and exports described CPU to.
Described brightness impression module is the brightness of image computing chip that possesses the dynamic brightness measuring ability, is used for the brightness value of detection of dynamic image to be displayed and exports described CPU to.
Described brightness impression module is the luminance sensor that possesses the dynamic brightness measuring ability.
Described regulating circuit is an auxiliary circuit, and described brightness impression module detection of dynamic testing environment brightness value exports described auxiliary circuit to, and the voltage that described auxiliary circuit changes exports backlight to.
Described energy-saving circuit also comprises the gating switch module, and described gating switch module is connected between regulating circuit and the backlight, is used to select the output terminal of regulating circuit to be communicated with the input end of backlight.
Described gating switch module comprises triode, first diode, second diode, the base stage of described triode links to each other with the control end of described CPU, the collector of described triode is connected between the anode of the auxiliary circuit output terminal and second diode, the grounded emitter of described triode, the negative electrode of described second diode links to each other with the input end of described backlight, the anode of described first diode links to each other with the PWM output terminal of described CPU, and the negative electrode of first diode links to each other with the input end of described backlight.
The present invention's beneficial effect compared with prior art is as follows:
The invention provides a kind of energy-saving circuit that is used for LCD, comprise brightness impression module and regulating circuit, regulating circuit is connected between brightness impression module and the backlight, the brightness value of described brightness impression module detection of dynamic environment or image also exports described regulating circuit to, and the regulating circuit voltage that output changes according to brightness value is to backlight.Like this, the voltage of input backlight is dynamically to change according to the brightness of environment or image.And the voltage of input backlight is invariable in the prior art, and like this, with respect to prior art, the present invention can saves energy, reaches purpose of power saving.And the present invention can be automatically according to brightness value when brightness of image is brighter, and the voltage that output changes is to backlight, turning down the effective voltage of input backlight, thereby makes the image of demonstration can be not dazzling, can feel more comfortable when the user watches image.
Description of drawings
Fig. 1 is the energy-saving circuit block diagram of the specific embodiment of the present invention one;
Fig. 2 is the energy-saving circuit block diagram of the specific embodiment of the present invention two;
Fig. 3 is the energy-saving circuit block diagram of the specific embodiment of the present invention three;
Fig. 4 is the energy-saving circuit figure of the specific embodiment of the present invention three;
Fig. 5 is the energy-saving circuit block diagram of the specific embodiment of the present invention four;
Fig. 6 is the energy-saving circuit figure of the specific embodiment of the present invention four.
Embodiment
Embodiment one:
As shown in Figure 1, a kind of energy-saving circuit that is used for LCD comprises possessing image display chip 1, the CPU that dynamic brightness detects (Dynamic Contrast Restrain is called for short DCR) function.The output terminal of image display chip 1 links to each other with the input end of CPU, and the output terminal of CPU links to each other with the input end of backlight 2.
Image display chip 1 is the bright dark degree of all pixels of image to be displayed according to input signal, and the average brightness value that draws each frame image to be displayed exports CPU to.Image display chip 1 possesses the function of DCR.
CPU imports the average brightness value of each frame image to be displayed, and output changes the pwm signal of dutycycle to backlight according to brightness value.The dutycycle of pwm signal is big more, and backlight is just bright more; Otherwise backlight is just dark more.
Embodiment two:
As shown in Figure 2, a kind of energy-saving circuit that is used for LCD comprises brightness of image computing chip 3, CPU.The output terminal of brightness of image computing chip 3 links to each other with the input end of CPU, and the output terminal of CPU links to each other with the input end of backlight 2.
The brightness value of the current display image of brightness of image computing chip 3 detection of dynamic also exports CPU to.CPU determines the backlight brightness values of a correspondence according to brightness value, and output changes the pwm signal of dutycycle to backlight according to backlight brightness values.
Embodiment three:
Shown in Fig. 3,4, a kind of energy-saving circuit that is used for LCD comprises luminance sensor 4, auxiliary circuit.Auxiliary circuit links to each other luminance sensor 4 with backlight 2.Luminance sensor 4 detection of dynamic testing environment brightness values export auxiliary circuit to, and auxiliary circuit exports backlight to according to the voltage that ambient brightness value changes.Auxiliary circuit comprises resistance R 1, R2, R3 and capacitor C1.
Embodiment four:
As shown in Figure 5, a kind of energy-saving circuit that is used for LCD comprises brightness of image computing chip 3, image display chip 1, CPU, luminance sensor 4, auxiliary circuit, gating switch module 6.The output terminal of image display chip 1, brightness of image computing chip 3 links to each other respectively with two input ends of CPU, the PWM output terminal of CPU links to each other with the input end of gating switch module 6 respectively with control end, auxiliary circuit links to each other the input end of luminance sensor 4 with gating switch module 6, and the output terminal of gating switch module 6 links to each other with the input end of backlight 2.The control end output control signal of CPU makes gating switch module 6 that the output terminal of auxiliary circuit is communicated with the input end of backlight or the PWM output terminal of CPU is connected with the input end of backlight 2.
As shown in Figure 6, gating switch module 6 comprises triode Q1, the first diode D1, the second diode D2.Triode Q1 is a positive-negative-positive, and its base stage links to each other with the control end of CPU, and its collector is connected between the anode of the auxiliary circuit output terminal and the second diode D2, and its emitter is by resistance R 4 ground connection.The negative electrode of the second diode D2 links to each other with the input end of backlight 2.The anode of the first diode D1 links to each other with the PWM output terminal of CPU, and the negative electrode of the first diode D1 links to each other with the input end of backlight 2.
When the control end of CPU is exported high level, triode Q1 conducting, the collector of triode Q1 is connected with emitter, and the voltage of the collector of triode Q1 is 0V.At this moment, the voltage signal of auxiliary circuit output is just isolated.CPU just just imports backlight 2 with the pwm signal of its PWM output terminal output; When the control end output low level of CPU, triode Q1 ends, and at this moment, the voltage signal of auxiliary circuit output is just imported backlight 2.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (8)
1. energy-saving circuit that is used for LCD is characterized in that:
Also comprise brightness impression module, regulating circuit; Described regulating circuit is connected between brightness impression module and the backlight, and the brightness value of described brightness impression module detection of dynamic environment or image also exports described regulating circuit to, and the described regulating circuit voltage that output changes according to brightness value is to backlight.
2. energy-saving circuit according to claim 1 is characterized in that:
Described regulating circuit is CPU, and the brightness output brightness value of described brightness impression module detection of dynamic image is to described CPU, and described CPU output changes the pwm signal of dutycycle to backlight.
3. energy-saving circuit according to claim 2 is characterized in that:
Described brightness impression module is the brightness of image computing chip that possesses the dynamic brightness measuring ability, is used for the brightness value of detection of dynamic image to be displayed and exports described CPU to.
4. energy-saving circuit according to claim 2 is characterized in that:
Described brightness impression module is the image display chip that possesses the dynamic brightness measuring ability, is used for the brightness value of detection of dynamic image to be displayed and exports described CPU to.
5. energy-saving circuit according to claim 1 is characterized in that:
Described brightness impression module is the luminance sensor that possesses the dynamic brightness measuring ability.
6. energy-saving circuit according to claim 5 is characterized in that:
Described regulating circuit is an auxiliary circuit, and described brightness impression module detection of dynamic testing environment brightness value exports described auxiliary circuit to, and the voltage that described auxiliary circuit changes exports backlight to.
7. according to claim 3 or 4 or 5 or 6 described energy-saving circuits, it is characterized in that:
Described energy-saving circuit also comprises the gating switch module, and described gating switch module is connected between regulating circuit and the backlight, is used to select the output terminal of regulating circuit to be communicated with the input end of backlight.
8. energy-saving circuit according to claim 7 is characterized in that:
Described gating switch module comprises triode, first diode, second diode, the base stage of described triode links to each other with the control end of described CPU, the collector of described triode is connected between the anode of the auxiliary circuit output terminal and second diode, the grounded emitter of described triode, the negative electrode of described second diode links to each other with the input end of described backlight, the anode of described first diode links to each other with the PWM output terminal of described CPU, and the negative electrode of first diode links to each other with the input end of described backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610062231 CN1996103A (en) | 2006-08-18 | 2006-08-18 | Energy-saving circuit for use in liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610062231 CN1996103A (en) | 2006-08-18 | 2006-08-18 | Energy-saving circuit for use in liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1996103A true CN1996103A (en) | 2007-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610062231 Pending CN1996103A (en) | 2006-08-18 | 2006-08-18 | Energy-saving circuit for use in liquid crystal display |
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| CN (1) | CN1996103A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399011B (en) * | 2007-09-28 | 2011-06-15 | 夏普株式会社 | Video displaying apparatus |
| CN101419778B (en) * | 2007-10-26 | 2011-11-09 | Lg电子株式会社 | Display apparatus and control method thereof for saving power |
| CN101783118B (en) * | 2009-01-15 | 2012-01-18 | 深圳市新超亮特种显示设备有限公司 | Novel LCD (Liquid Crystal Display) double energy-saving control module |
| CN102034442B (en) * | 2009-09-25 | 2012-09-05 | 比亚迪股份有限公司 | Method and device for adjusting backlight of liquid crystal display screen as well as terminal equipment |
| CN103137074A (en) * | 2011-11-30 | 2013-06-05 | 天津三星电子有限公司 | Energy-saving method and device for displayer and displayer |
| CN105828495A (en) * | 2015-01-09 | 2016-08-03 | 鸿富锦精密工业(武汉)有限公司 | Backlight brightness control system |
| CN101527119B (en) * | 2007-12-03 | 2016-08-03 | 英特尔公司 | Intelligent automatic backlight control scheme |
-
2006
- 2006-08-18 CN CN 200610062231 patent/CN1996103A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399011B (en) * | 2007-09-28 | 2011-06-15 | 夏普株式会社 | Video displaying apparatus |
| CN101419778B (en) * | 2007-10-26 | 2011-11-09 | Lg电子株式会社 | Display apparatus and control method thereof for saving power |
| CN101527119B (en) * | 2007-12-03 | 2016-08-03 | 英特尔公司 | Intelligent automatic backlight control scheme |
| CN101783118B (en) * | 2009-01-15 | 2012-01-18 | 深圳市新超亮特种显示设备有限公司 | Novel LCD (Liquid Crystal Display) double energy-saving control module |
| CN102034442B (en) * | 2009-09-25 | 2012-09-05 | 比亚迪股份有限公司 | Method and device for adjusting backlight of liquid crystal display screen as well as terminal equipment |
| CN103137074A (en) * | 2011-11-30 | 2013-06-05 | 天津三星电子有限公司 | Energy-saving method and device for displayer and displayer |
| CN105828495A (en) * | 2015-01-09 | 2016-08-03 | 鸿富锦精密工业(武汉)有限公司 | Backlight brightness control system |
| CN105828495B (en) * | 2015-01-09 | 2019-01-22 | 鸿富锦精密工业(武汉)有限公司 | backlight brightness control system |
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Open date: 20070711 |