CN201765806U - Liquid crystal display dimming circuit - Google Patents
Liquid crystal display dimming circuit Download PDFInfo
- Publication number
- CN201765806U CN201765806U CN2010202458327U CN201020245832U CN201765806U CN 201765806 U CN201765806 U CN 201765806U CN 2010202458327 U CN2010202458327 U CN 2010202458327U CN 201020245832 U CN201020245832 U CN 201020245832U CN 201765806 U CN201765806 U CN 201765806U
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- circuit
- backlight
- pulse signal
- light adjusting
- dimming
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Abstract
The utility model discloses a liquid crystal display dimming circuit which comprises a dimming controller (10), a pulse width modulation integrated circuit (50), an inverter (60) and a backlight (70) which are sequentially connected, wherein the dimming controller (10) outputs a first dimming pulse signal, and a logic OR gate circuit (30) is serially connected between the dimming controller (10) and the pulse width modulation integrated circuit (50); and the liquid crystal display dimming circuit also comprises a time sequence control circuit (20) connected with the logic OR gate circuit (30). The dimming circuit can be used for regulating the luminance of the backlight according to the dimming pulse signal output by the dimming controller, and can also be used for carrying out dynamic backlight regulation on the dimming pulse signal output by the time sequence controller, thereby having better compatibility.
Description
Technical field
The utility model relates to the light adjusting circuit of a kind of light adjusting circuit, particularly a kind of liquid crystal display.
Background technology
Characteristics such as LCD has frivolous, and low power consumption and radiation are little, and be widely used in electronic equipments such as display, LCD TV, mobile phone and notebook computer.Because the liquid crystal molecule itself in the LCD is not luminous, so LCD needs to show by the luminous image of realizing of a module backlight.Usually adopt in the module backlight cold cathode ray tube (Co1dCathode F1uorescent Lamp, CCLF) or light emitting diode as its luminous light source.
When adopting cold cathode ray tube,,, DC voltage is converted into alternating voltage to drive this cold cathode ray tube so need the light adjusting circuit of design specialized because cold cathode ray tube needs High AC voltage to drive as light source.
The prior art light adjusting circuit comprise a light adjusting controller, a pulse-width modulation integrated circuit (PulseWidthModulation, PWM), an inverter (Inverter) and a backlight.This backlight is a cold cathode ray tube.
During this light adjusting circuit work, the user exports the light adjusting controller of a brightness regulated signal to this light adjusting circuit by the control of the screen display on this LCD button, this light adjusting controller output one has light modulation pulse signal with the corresponding dutycycle of brightness regulated signal to this pulse-width modulation integrated circuit, this pulse-width modulation integrated circuit is exported the drive pulse signal of a corresponding dutycycle to this inverter according to this light modulation pulse signal, this inverter produces an alternating voltage according to this drive pulse signal and drives this backlight, and the brightness of this backlight changes according to the size of the dutycycle of the drive pulse signal of this pulse-width modulation integrated circuit output, and promptly the brightness of big then this backlight of the dutycycle of this drive pulse signal is strong.
Along with the development of technology, in order to reach energy-conservation and to improve the purpose of contrast, industry has proposed the brightness that a kind of new technology is regulated backlight, promptly the dynamic backlight control technology (Dynamic BacklightControl, DBC).But, the pulse-width modulation integrated circuit of this light adjusting circuit can only be regulated the brightness of this backlight according to the light modulation pulse signal of this light adjusting controller output, can not utilize the dynamic backlight control technology to come the brightness of this backlight of dynamic adjustments, therefore, the poor compatibility of this light adjusting circuit.
The utility model content
Goal of the invention of the present utility model is: at the above-mentioned problem that has the light adjusting circuit poor compatibility, provide a kind of compatibility good liquid crystal display light adjusting circuit.
The technical solution adopted in the utility model is such: a kind of liquid crystal display light adjusting circuit, it comprises light adjusting controller, pulse-width modulation integrated circuit, inverter and the backlight that is linked in sequence successively, described light adjusting controller is exported the first light modulation pulse signal, be connected in series a logic sum gate circuit between light adjusting controller and the pulse-width modulation integrated circuit, also comprise the sequential control circuit that is connected with the logic sum gate circuit.
In sum, owing to adopted technique scheme, the beneficial effects of the utility model are: the light adjusting controller of above-mentioned light adjusting circuit and this time schedule controller are exported the light modulation pulse signal respectively to this logic gates, to this this pulse-width modulation integrated circuit, then the signal of this light adjusting controller and the output of this time schedule controller can export this pulse-width modulation integrated circuit to together to regulate the brightness of backlight by this logic gates output light modulation pulse signal.Thereby this light adjusting circuit can be regulated the brightness of this backlight according to the light modulation pulse signal of this light adjusting controller output, also can carry out dynamic backlight according to the light modulation pulse signal of this time schedule controller output and regulate, thereby this light adjusting circuit is better compatible.
Description of drawings
Fig. 1 is the theory diagram of the utility model liquid crystal display light adjusting circuit.
Mark among the figure: 10 is light adjusting controller, 20 is time schedule controller, 30 is the logic sum gate circuit, and 50 is the pulse-width modulation integrated circuit, and 60 is inverter, 70 is backlight, S1 is the first light modulation pulse signal, and S2 is the second light modulation pulse signal, and S3 is the 3rd light modulation pulse signal, 31 is the logic sum gate circuit input end, and 32 is the logic sum gate circuit output end.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 1, a kind of synoptic diagram of liquid crystal display light adjusting circuit embodiment.This light adjusting circuit comprises light adjusting controller 10, time schedule controller 20, logic sum gate circuit 30, pulse-width modulation integrated circuit 50, inverter 60 and backlight 70.This backlight 70 is cold cathode ray tube or external-electrode fluorescent lamp.These light adjusting controller 10 outputs one have the first light modulation pulse signal S1 that changes dutycycle, and the frequency of this first light modulation pulse signal S1 is f1, is generally 300HZ.This time schedule controller 20 is used a dynamic backlight control technology, it has dynamic adjustments function backlight, the i.e. GTG display frame of these time schedule controller 20 detection LCD monitors (figure does not show), export a dutycycle respective change to realize the second light modulation pulse signal S2 of dynamic adjustments backlight function, the frequency of this second light modulation pulse signal S2 is f2, be generally 3000HZ, i.e. f1＜f2.This logic sum gate circuit 30 comprises two input ends 31 and an output terminal 33.This light adjusting controller 10 and this time schedule controller 20 are connected to two input ends 31 of this logical AND gate circuit 30 respectively, and the output terminal 33 of this logic sum gate circuit 30 is connected to this backlight 70 via this pulse-width modulation integrated circuit 50 and this inverter 60 more in regular turn.
Compared to prior art, the logic sum gate circuit 30 of above-mentioned light adjusting circuit superposes the second light modulation pulse signal S2 that dynamic backlight regulates that is used for of the first light modulation pulse signal S1 of this light adjusting controller 10 outputs and 20 outputs of this time schedule controller, and then the 3rd light modulation pulse signal S3 of these logic sum gate circuit 30 outputs waveform that both had this first light modulation pulse signal S1 also has the waveform of this second light modulation pulse signal S2.So, the 3rd light modulation pulse signal S3 exports this pulse-width modulation integrated circuit 50 to and carries out light modulation, can make this light adjusting circuit can regulate the brightness of this backlight 70 according to the first light modulation pulse signal S1 of these light adjusting controller 10 outputs, also can carry out dynamic backlight according to the second light modulation pulse signal S2 of these time schedule controller 20 outputs and regulate, thereby this light adjusting circuit is better compatible.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (2)
1. liquid crystal display light adjusting circuit, it comprises light adjusting controller (10), pulse-width modulation integrated circuit (50), inverter (60) and the backlight (70) that is linked in sequence successively, described light adjusting controller (10) the output first light modulation pulse signal, it is characterized in that: be connected in series a logic sum gate circuit (30) between light adjusting controller (10) and the pulse-width modulation integrated circuit (50), also comprise the sequential control circuit (20) that is connected with logic sum gate circuit (30).
2. liquid crystal display light adjusting circuit as claimed in claim 1 is characterized in that: described this backlight is cold cathode ray tube or external-electrode fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202458327U CN201765806U (en) | 2010-07-02 | 2010-07-02 | Liquid crystal display dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202458327U CN201765806U (en) | 2010-07-02 | 2010-07-02 | Liquid crystal display dimming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201765806U true CN201765806U (en) | 2011-03-16 |
Family
ID=43718415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202458327U Expired - Fee Related CN201765806U (en) | 2010-07-02 | 2010-07-02 | Liquid crystal display dimming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201765806U (en) |
-
2010
- 2010-07-02 CN CN2010202458327U patent/CN201765806U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110316 Termination date: 20110702 |