CN201413625Y - Back light modulation circuit and TV set with the same - Google Patents
Back light modulation circuit and TV set with the same Download PDFInfo
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- CN201413625Y CN201413625Y CN2009200229123U CN200920022912U CN201413625Y CN 201413625 Y CN201413625 Y CN 201413625Y CN 2009200229123 U CN2009200229123 U CN 2009200229123U CN 200920022912 U CN200920022912 U CN 200920022912U CN 201413625 Y CN201413625 Y CN 201413625Y
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Abstract
The utility model discloses a back light modulation circuit and a TV set with the same. The back light modulation circuit comprises a main chip, a switch circuit and a back light voltage regulating end, wherein the back light voltage regulating end is used for changing the back light brightness, the control end of the switch circuit receives control signals sent by the main chip and controls the on-off state of a closed switch circuit according to the level state of the control signals, the closed switch circuit of the switch circuit is respectively connected with an upper pulling circuit, a lower pulling circuit and the back light voltage regulating end, and the high level output by the upper pulling circuit is selected to act on the back light voltage regulating end according to the on-off state, or the back light voltage regulating end is communicated with the lower pulling circuit to change the amplitude of the back light voltage. The back light modulation circuit has the advantages of simple structure and ingenious design, and can realize the change of the back light voltage under the condition that the back light voltage can not adopt the PWM modulation way for regulation, and the energy-saving mode of the whole machine can be further realized at the same time as effectively regulating the back light brightness.
Description
Technical field
The utility model belongs to the image display technology field, specifically, relates to that a kind of image back light brightness is for a change realized energy saver mode and the backlight modulation circuit that designs and adopt described backlight modulation circuit and the liquid crystal TV set that designs.
Background technology
For present LCD product, realize energy saver mode in order to change backlight illumination, need regulate the backlight illumination of liquid crystal display.Traditional adjustment mode backlight is to adopt the pwm signal of master chip output in the LCD product to be modulated into DC level through triode and integrating circuit, and then the frequency by changing the PWM waveform or duty recently realize the adjusting to the DC level amplitude, to reach the effective control to the liquid crystal display backlight illumination.So, the user can be chosen in and daytime backlight illumination be raise, to obtain bright clearly image; And at night, then can select backlight illumination is reduced, make the image deepening, under the prerequisite that does not influence image display effect, realize the energy-saving run of product.
And for the LCD product of not supporting PWM modulation backlight illumination, such as present 19 cun, 22 cun liquid crystal TV sets etc., its internal electrical source plate is exported in the liquid crystal display voltage of backlight and is fixed, so, backlight illumination can't be adjusted, and can not realize energy-saving run.In order to make this type of LCD product realize energy saver mode, need a kind of backlight modulation circuit of redesign to realize effective adjustment of liquid crystal display backlight illumination, to realize energy saver mode.
The utility model content
The purpose of this utility model is to provide a kind of backlight modulation circuit simple in structure, with low cost, can can not adopt under the situation that the PWM modulation system changes at voltage backlight, realize effective adjusting of voltage backlight dexterously, thereby reach the purpose of design of adjusting backlight illumination, realizing the device energy conservation operation.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of backlight modulation circuit comprises master chip, on-off circuit and is used to change the voltage-regulation end backlight of backlight illumination; The control end of described on-off circuit receives the control signal that master chip sends, control the on off operating mode of its switch ways according to the level state of control signal, the switch ways of described on-off circuit is connected with pull-up circuit, pull-down circuit and voltage-regulation end backlight respectively, select the high level of pull-up circuit output is acted on voltage-regulation end backlight according to its on off operating mode, perhaps voltage-regulation end backlight is communicated with pull-down circuit, to change the amplitude of backlight control voltage.
Further, the switch ways one end ground connection of described on-off circuit, the other end is connected with voltage-regulation end backlight with pull-up circuit respectively.
Further again, in described on-off circuit, include a NPN type triode, the base stage of described triode receives the control signal that master chip sends, grounded emitter, collector connects pull-up circuit, and connects described voltage-regulation end backlight by resistance.
Certainly, described NPN type triode also can adopt devices such as positive-negative-positive triode, metal-oxide-semiconductor or switch chip to substitute, be connected with described voltage-regulation end backlight with control pull-up circuit or pull-down circuit by the on off operating mode that changes himself, and then realize effective adjusting of voltage backlight, reach the purpose of design that changes backlight illumination.
Preferably, comprise resistance and direct supply in described pull-up circuit, described direct supply connects the switch ways of on-off circuit by this resistance.
Further again, described voltage-regulation end backlight is connected with a backlight electric power simultaneously.
Based on above-mentioned backlight modulation circuit structure, the utility model provides a kind of televisor that adopts described backlight modulation circuit design again, comprises host circuit and display screen, comprises power circuit, master chip and a backlight modulation circuit in host circuit; Display screen is provided with the voltage-regulation end backlight that is used to regulate backlight illumination.By an on-off circuit that is controlled by master chip is set in described backlight modulation circuit, and then utilize the change of on-off circuit on off operating mode, realize that voltage-regulation end backlight is communicated with the selection of pull-up circuit or pull-down circuit, change the voltage backlight of display screen with this, realize effective adjusting of display backlight brightness.
Compared with prior art, advantage of the present utility model and good effect are: backlight modulation circuit structure of the present utility model is simple, design is ingenious, can can not adopt under the situation that the PWM modulation system regulates at voltage backlight, realize the change of voltage backlight, and then when effectively regulating backlight illumination, the energy-saving run of realization equipment is particularly useful for 19 cun, 22 cun liquid crystal TV sets etc. and does not support in the LCD product of PWM modulation backlight illumination.
After reading the detailed description of the utility model embodiment in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the backlight modulation circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of another embodiment of the backlight modulation circuit that proposes of the utility model;
Fig. 3 is the schematic block circuit diagram of a kind of embodiment of internal circuit that adopts the televisor of above-mentioned backlight modulation circuit design.
Embodiment
Below in conjunction with accompanying drawing specific embodiment of the utility model is described in detail.
Backlight modulation circuit of the present utility model changes tradition and adopts the PWM modulation system to regulate the design of display device voltage backlight, a kind of circuit structure form that adopts elements such as on-off circuit, pull-up circuit and pull-down circuit to set up and form has been proposed, to realize effective adjusting to the display device backlight illumination.Specifically, the control signal of utilizing master chip to send is carried out break-make control to on-off circuit, select the high level of pull-up circuit output is acted on the voltage-regulation end backlight of display device according to the on off operating mode of on-off circuit, perhaps pull-down circuit is acted on voltage-regulation end backlight, to drag down the current potential of voltage-regulation end backlight, thereby change the amplitude of the backlight control voltage that exports display device to, and then realization reaches the purpose of design of regulating the display device backlight illumination to effective adjusting of display device voltage backlight.
Elaborate the concrete composition structure and the principle of work thereof of described backlight modulation circuit below by three specific embodiments.
Embodiment one, and referring to shown in Figure 1, in the present embodiment, described on-off circuit adopts a NPN type triode to cooperate simple peripheral circuit to connect to form.Wherein, the base stage of NPN type triode V34 connects master chip by resistance R 1, such as wherein one road GPIO mouth of master chip, receives the control signal that master chip sends, such as high level or low level pulse signal, and then control NPN type triode V34 enters saturation conduction or cut-off state.The emitter of described NPN type triode V34 connects pull-down circuit, such as direct ground connection; Collector connects pull-up circuit on the one hand, such as connecting direct supply VCC by resistance R 2, is connected the voltage-regulation end BKLT_ADJ backlight of display device on the other hand with filter capacitor C1 by resistance R 3.Described voltage-regulation end BKLT_ADJ backlight is connected with backlight electric power Vbk simultaneously.
With the liquid crystal TV set is the principle of work that example is briefly set forth backlight modulation circuit shown in Figure 1.Backlight electric power Vbk is the voltage backlight that power panel is supplied with LCDs, about 1.8V.Voltage backlight is low more, and backlight is bright more; Voltage backlight is high more, and backlight is dark more.When operate as normal, by software design the GPIO mouth of the optical modulating circuit output control signal that is used in the master chip to support or oppose is changed to high level, and then control NPN type triode V34 saturation conduction.At this moment, the collector voltage of triode V34 is dragged down, and causes the voltage-regulation end BKLT_ADJ backlight of LCDs to reduce, and voltage promptly backlight reduces, thereby backlight illumination is raise, and image brightens, and correspondingly is set to day mode on the menu.In the time of backlight illumination need being reduced, become night mode by menu setting, at this moment, master chip is changed to low level with the GPIO mouth, triode V34 ends, direct supply VCC raises its current potential by resistance R 2, the R3 photovoltage adjustable side BKLT_ADJ output high level of supporting or opposing, and voltage promptly backlight raises, thereby backlight illumination is reduced, the image deepening enters night mode, realizes energy-conservation simultaneously.
Certainly, described NPN type triode V34 also can adopt a N-channel MOS to replace, and the same Fig. 1 of its peripheral circuit can realize the adjusting to voltage backlight equally.
Embodiment two, and referring to shown in Figure 2, in the present embodiment, described on-off circuit adopts a positive-negative-positive triode to cooperate simple peripheral circuit to realize.Wherein, the base stage of positive-negative-positive triode V35 connects master chip by resistance R 1, such as wherein one road GPIO mouth of master chip, receives the control signal that master chip sends, such as high level or low level pulse signal, connect direct supply VCC by resistance R 4 simultaneously.The collector of described positive-negative-positive triode V35 connects pull-down circuit, such as direct ground connection; Emitter connects pull-up circuit on the one hand, such as connecting direct supply VCC by resistance R 2, is connected the voltage-regulation end BKLT_ADJ backlight of display device on the other hand with filter capacitor C1 by resistance R 3.Described voltage-regulation end BKLT_ADJ backlight is connected with backlight electric power Vbk simultaneously.
Same is the principle of work that example is set forth backlight modulation circuit shown in Figure 2 with the liquid crystal TV set.When the user need raise the backlight illumination of display screen, select to enter day mode by television set main menu.At this moment, the GPIO mouth that master chip is used it for the optical modulating circuit output control signal that supports or opposes is changed to low level, and then control positive-negative-positive triode V35 saturation conduction.At this moment, the emitter voltage of triode V35 is dragged down, and then causes the voltage-regulation end BKLT_ADJ backlight of LCDs to reduce, and voltage promptly backlight reduces, thereby backlight illumination is raise, and image brightens.And when the user need reduce backlight illumination, select to enter night mode by television set main menu, at this moment, master chip is changed to high level with its GPIO mouth, the emitter current potential is identical ends with it owing to its base potential for triode V35, direct supply VCC raises its current potential by resistance R 2, the R3 photovoltage adjustable side BKLT_ADJ output high level of supporting or opposing, and voltage promptly backlight raises, thereby backlight illumination is reduced, the image deepening enters night mode, realizes energy-conservation simultaneously.
Certainly, described positive-negative-positive triode V35 also can adopt a P channel MOS to replace, and the same Fig. 2 of its peripheral circuit can realize the adjusting to voltage backlight equally.
In addition, described on-off circuit also can adopt a single-pole double-throw switch (SPDT) to realize, and is not shown.Two gating contacts of single-pole double-throw switch (SPDT) are connected one to one with pull-up circuit and pull-down circuit respectively, common connects the voltage-regulation end BKLT_ADJ backlight of display device, control end receives the control signal that master chip sends, and then select its common is communicated with one of them gating contact according to the level state of control signal, the voltage-regulation end BKLT_ADJ backlight that is about to display device is communicated with pull-up circuit or pull-down circuit, and then change voltage backlight, realize effective adjusting of backlight illumination.
Certainly, described on-off circuit can adopt other components and parts with on-off action or integrated chip to cooperate simple peripheral circuit to connect equally and realize that present embodiment is not limited thereto.
With the televisor be below example elaborate described backlight modulation circuit in televisor concrete application and compare the good effect that conventional television is brought.
Embodiment three, and Fig. 3 comprises host circuit and display screen for the internal circuit theory diagram of the televisor of the described backlight modulation circuit of application.In host circuit, be provided with major parts such as power panel, front panel, decoding deck and audio plate.Wherein, described front panel is provided with the key circuit that receives the user key-press triggering command, receives the remote-control receiving circuit of the infrared remote-controlled signal that telepilot sends and the high frequency tuner circuit that is used to receive TV RF signals.Described high frequency tuner circuit is after receiving the radio television signal that TV station sends, with its demodulation, handle the back and generate the picture signal and the audio signal that are separated from each other and transfer to decoding deck by interface.Described decoding deck is provided with the master chip as whole televisor core cell, be used for finishing and carry out tasks such as decoding processing to the centralized control of televisor major function circuit and to picture signal, such as HID master chip commonly used in the present panel TV set etc., and then export the video image that generates after the decoding processing to display screen and show output.Described audio plate is provided with the audio processing unit, after the audio signal that receives is carried out power amplification etc. and handled, drives loudspeaker output television field frame.
The required backlight electric power Vbk of above-mentioned front panel, decoding deck and audio plate needed various power supplies and display screen in operational process provides by power panel output.In order to realize effective adjusting to display backlight brightness, the backlight modulation circuit of being set forth among the embodiment one, two is arranged on power panel or the decoding deck, produce and export described control signal by original master chip on the decoding deck, with the break-make of gauge tap circuit.Simultaneously, the employed direct supply VCC of pull-up circuit can be provided by power panel output equally in the backlight modulation circuit, such as power panel output+the 5V DC voltage, and then the voltage backlight that the backlight modulation circuit produces is transferred to the voltage-regulation end backlight of display screen by interface, to change the voltage backlight of display screen, realize effective adjusting of backlight illumination.
Should be understood that; the above only is a kind of preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1, a kind of backlight modulation circuit is characterized in that: comprise master chip, on-off circuit and be used to change the voltage-regulation end backlight of backlight illumination; The control end of described on-off circuit receives the control signal that master chip sends, control the on off operating mode of its switch ways according to the level state of control signal, the switch ways of described on-off circuit is connected with pull-up circuit, pull-down circuit and voltage-regulation end backlight respectively, select the high level of pull-up circuit output is acted on voltage-regulation end backlight according to its on off operating mode, perhaps voltage-regulation end backlight is communicated with pull-down circuit, to change the amplitude of backlight control voltage.
2, backlight modulation circuit according to claim 1 is characterized in that: the switch ways one end ground connection of described on-off circuit, the other end are connected with voltage-regulation end backlight with pull-up circuit respectively.
3, backlight modulation circuit according to claim 2, it is characterized in that: in described on-off circuit, include a NPN type triode, the base stage of described triode receives the control signal that master chip sends, grounded emitter, collector connects pull-up circuit, and connects described voltage-regulation end backlight by resistance.
4, backlight modulation circuit according to claim 1 is characterized in that: comprise resistance and direct supply in described pull-up circuit, described direct supply connects the switch ways of on-off circuit by this resistance.
5, according to each described backlight modulation circuit in the claim 1 to 4, it is characterized in that: described voltage-regulation end backlight is connected with a backlight electric power simultaneously.
6, a kind of televisor comprises host circuit and display screen, comprises power circuit, master chip and a backlight modulation circuit in described host circuit; Described display screen is provided with the voltage-regulation end backlight that is used to regulate backlight illumination; It is characterized in that: in described backlight modulation circuit, include an on-off circuit, the control end of described on-off circuit receives the control signal that master chip sends, control the on off operating mode of its switch ways according to the level state of control signal, the switch ways of described on-off circuit respectively with pull-up circuit, the voltage-regulation end backlight of pull-down circuit and display screen is connected, select to export the high level of pull-up circuit output to described voltage-regulation end backlight according to its on off operating mode, perhaps described voltage-regulation end backlight is communicated with pull-down circuit, to change the voltage backlight of display screen.
7, televisor according to claim 6 is characterized in that: the switch ways one end ground connection of described on-off circuit, the other end are connected with voltage-regulation end backlight with pull-up circuit respectively.
8, televisor according to claim 7, it is characterized in that: in described on-off circuit, include a NPN type triode, the base stage of described triode receives the control signal that master chip sends, grounded emitter, collector connects pull-up circuit, and connects described voltage-regulation end backlight by resistance.
9, televisor according to claim 6 is characterized in that: comprise resistance and direct supply in described pull-up circuit, described direct supply connects the switch ways of on-off circuit by this resistance.
10, according to each described televisor in the claim 6 to 9, it is characterized in that: described voltage-regulation end backlight is connected with a backlight electric power simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200229123U CN201413625Y (en) | 2009-03-03 | 2009-03-03 | Back light modulation circuit and TV set with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200229123U CN201413625Y (en) | 2009-03-03 | 2009-03-03 | Back light modulation circuit and TV set with the same |
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| Publication Number | Publication Date |
|---|---|
| CN201413625Y true CN201413625Y (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200229123U Expired - Fee Related CN201413625Y (en) | 2009-03-03 | 2009-03-03 | Back light modulation circuit and TV set with the same |
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| Country | Link |
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| CN (1) | CN201413625Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957886A (en) * | 2012-11-13 | 2013-03-06 | 广东长虹电子有限公司 | System and method for controlling television set backlight |
| CN114267302A (en) * | 2021-12-31 | 2022-04-01 | 北京显芯科技有限公司 | Control method, dimming controller and display device |
-
2009
- 2009-03-03 CN CN2009200229123U patent/CN201413625Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957886A (en) * | 2012-11-13 | 2013-03-06 | 广东长虹电子有限公司 | System and method for controlling television set backlight |
| CN114267302A (en) * | 2021-12-31 | 2022-04-01 | 北京显芯科技有限公司 | Control method, dimming controller and display device |
| CN114267302B (en) * | 2021-12-31 | 2022-11-08 | 北京显芯科技有限公司 | Control method, dimming controller and display device |
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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: 20100224 Termination date: 20130303 |