CN103456270A - Dynamic dimming device for LED backlight - Google Patents
Dynamic dimming device for LED backlight Download PDFInfo
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- CN103456270A CN103456270A CN 201210174931 CN201210174931A CN103456270A CN 103456270 A CN103456270 A CN 103456270A CN 201210174931 CN201210174931 CN 201210174931 CN 201210174931 A CN201210174931 A CN 201210174931A CN 103456270 A CN103456270 A CN 103456270A
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Abstract
The invention relates to the technical field of liquid crystal displays and provides a dynamic dimming device for LED backlight. The dynamic dimming device is used for dynamically adjusting backlight color and brightness in LCD TVs using the LED backlight. Brightness of light is changed to adjust backlight color and brightness by controlling a drive signal flowing through a backlight system. The amplitude of the drive signal flowing through the backlight system is controlled through the signal after the image signal is processed by a control circuit. In addition, brightness of the light emitted by color LEDs is changed by controlling current or voltage flowing through the color LEDs; after the light is refracted by a prism, different areas on a light guide plate change in dolor, and accordingly backlight color and brightness is adjusted.
Description
Technical field
The present invention relates to the LCD Technology field, particularly a kind of dynamic light adjustment device of LED-backlit.
Background technology
(the Liquid Crystal Display of LCD in current flat-panel display device, liquid crystal display) display device has occupied dominant position, and, in existing LCD device, because LCD panel itself can not be luminous, thereby backlight is indispensable ingredient in the LCD device.
In the LCD backlight, due to LED (Light Emitting Diode, light emitting diode) there is wide colour gamut, the advantage such as white point is adjustable, high dimming ratio and long-life, recently be developed as novel LCD backlight, and in desk-top LCD display and LCD TV, be used widely.To further realize that higher contrast and color representation will utilize the dynamic backlight regulation technology.The present common practice is to utilize white LED light source to form matrix to realize dynamic backlight. but this way has obvious inferior position: the one, LED light source quantity used is more, thereby has brought larger energy consumption.The 2nd, a large amount of LED can cause very large heating problem, and this has not only improved the requirement to heat abstractor, and this high heat also can cause the serviceable life of other assembly in the mechanism, as the electrochemical capacitor on circuit board.The 3rd, simple white light LEDs is backlight certain restriction aspect color representation.
Along with improving constantly of single LEDs brightness, in LCD backlight, the number of LED lamp used, fewer and feweri, thereby has started progressively to adopt the side type LED-backlit to replace direct-light type LED backlight on the market, further to reduce the thickness of LCD device.
No matter be direct-light type LED backlight or side type LED-backlit, all need dynamic light adjustment is carried out in its LED-backlit source, so that display presents different colors and brightness.In back light system, although the current white light LEDs generally adopted has certain advantage on contrast and cost, but (be generally RGB LED than color LED on colour gamut, be red, green, blue LED) also have certain gap, along with the development of LED manufacturing technology, the cost of RGB LED also can progressively descend, and its brightness constantly increases, volume constantly reduces, for the LCD TV that is applied to various sizes provides more strong support in the future.For the advantage by LED-backlit, especially color LED backlight is applied in LCD as early as possible, in the urgent need to effective dynamic light adjustment technology.
Summary of the invention
(1) technical matters of wanting an ancient drinking vessel to determine
Shortcoming for prior art, the present invention is in order to solve the problem that lacks effective dynamic light adjustment technology in prior art in LED-backlit, a kind of dynamic light adjustment device of LED-backlit is provided, thereby flow through the brightness of the driving signal change light in the LED-backlit system by control, to reach the purpose of regulating color backlight and brightness.
(2) technical scheme
In order to solve the problems of the technologies described above, the following scheme of this concrete employing is carried out:
A kind of dynamic light adjustment device of LED-backlit, described device comprises:
Master control borad and LED-backlit system, described master control borad is comprised of control circuit 4 and driving power circuit 5; Wherein, described control circuit 4 is connected with driving power circuit 5 with the external image unit, receives external image signal and exports after treatment control signal to described driving power circuit;
Described driving power circuit 5 also is connected with described LED-backlit system, according to the described control signal received, exports the driving signal of real-time change to described LED-backlit system.
Preferably, described LED-backlit system is side type LED-backlit system.
Preferably, described LED-backlit system is the color LED backlight system.
Preferably, described color LED backlight system is comprised of light guide plate 1, prism 2 and color LED lamp bar 3, according to connecing
The luminosity of the driving signal controlling color LED of the described real-time change of receiving forms different colours after described prismatic refraction on described light guide plate.
Preferably, described color LED lamp bar 3 is comprised of a plurality of independent LED unit of controlling each other, the corresponding described prism 2 in each LED unit.
Preferably, each described LED unit is comprised of the LED of different colours, the curtage difference that the LED of each different colours receives.
Preferably, the described LED by different colours is comprised of red LED and green LED and forms, or is comprised of red LED and blue led, or is comprised of red LED+green LED and blue led.
Preferably, described driving power circuit 5 comprises:
Receive the voltage input end mouth 9 of the operating voltage of described master control borad;
Receive the control signal input port 6 ' of described control signal;
For described control circuit provides the Voltage-output port 10 of operating voltage;
Export the driver output port 7 of the driving signal of described real-time change.
Preferably, described control circuit is exported described control signal to described driving power circuit by spi bus or I2C bus.
(3) beneficial effect
This is processed rear output control control signal by control circuit to picture signal changes the curtage on the LED in the LED-backlit system in good time, has reached the purpose that dynamic backlight is regulated.
The accompanying drawing explanation
The structural representation that invention Fig. 1 is dynamic light adjustment device in the preferred embodiment of the invention;
The structural representation that invention Fig. 2 is RGB back light system in the preferred embodiment of the invention;
Invention Fig. 3 is the module diagram that in the preferred embodiment of the invention, circuit is controlled.
Embodiment
Below in conjunction with the accompanying drawing in the present embodiment, the technical scheme in the present embodiment is clearly and completely described, obviously, described embodiment is this part of embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not having Imitation to go out the every other embodiment obtained under the prerequisite of creative work, belong to the scope of this protection.
The invention provides a kind of dynamic light adjustment device of LED-backlit, this scheme is comprised of master control borad and LED-backlit system.One of two input port of master control borad connect power supply, and another is inputted for picture signal, comprise control circuit and LED driving power circuit on master control borad.Control circuit is processed rear output control signal to picture signal makes the curtage on LED change (under specifically processing mode is shown in) in good time, reached the purpose that dynamic backlight is regulated, thus solved at present can't dynamic light adjustment to LED-backlit (especially color LED backlight) problem.
No matter device of the present invention all can carry out dynamic light adjustment to direct-light type LED backlight or side type LED-backlit, but in a preferred embodiment, for further reducing the thickness of LCD device, adopt side type LED-backlit system, its LED unit, prism, light guide plate are arranged in same plane.In more excellent embodiment of the present invention, the LED unit is the color LED unit, and the light that each color LED lamp sends is by producing refraction after prism, and the brightness of controlling LED light can form different colors on light guide plate.
Wherein, color LED lamp can be red green two colours, red blue two colours, also can be RGB (RGB) three colours, in optimum embodiment hereinafter, preferably adopt the form of RGB LED lamp.
Embodiment below in conjunction with each accompanying drawing to an optimum of the present invention is described in further detail:
In dynamic light adjustment device shown in Fig. 1 (back light unit is only chosen part), control circuit 4 receives external image signal by picture signal input port 8, collect 1. C-DC power circuit of road by control signal output port 6 output control signals to driving power after treatment) 5, DC-DC circuit 5 provides voltage (being generally 24V) power supply by outside voltage input end mouth 9, then by Voltage-output port 10 output control circuits 4 required voltage (being generally 3.3V); In addition, DC-DC power circuit 5, under the effect of described control signal, is exported the driving signal of real-time change to RGB LED-backlit system by driver output port 7.
In Fig. 2, light guide plate 1, prism 2, LED lamp bar 3 have formed a back light system jointly.Preferably, light guide plate 1, prism 2, RGB LED lamp bar 3 are positioned at same plane, and the spacing between them can not be adjusted.More preferably, LED lamp bar 3 is comprised of a plurality of LED unit, and each LED unit is comprised of red LED II, green LED 12, blue led 13.The corresponding prism in each LED unit.
In conjunction with Fig. 1, in such LED-backlit system, LED lamp bar 3 received currents or voltage signal, drive red LED I1, green LED 12, blue led 13 by different circuits respectively again; The light that LED of all kinds sends enters light guide plate 1 after prism 2 refractions, and in light guide plate 1, the light of three kinds of different colours can produce different colors and brightness according to superposition principle.
Fig. 3 is the process module schematic diagram that information-processing circuit is controlled, at first control circuit receives picture signal, color information to picture signal is processed, such as carrying out the histogram processing, draw respectively the gray-scale value of RGB three colours real-time not Gang separately, according to this gray-scale value, concrete facilities (setting of light path system and LED lamp) in conjunction with back light system, the control signal of described control circuit output real-time change is to the DC-DC power circuit, and this control signal can be exported to power circuit by spi bus or work 2C bus.
Subsequently, the DC-DC power circuit is according to this control signal and in conjunction with the setting of corresponding different light path system in the LED-backlit system and different color LED lamp, for different LED lamps provides appropriate current signal or voltage signal, in order to carry out a suitable color configuration, in the LED-backlit system, according to this, appropriate current signal or voltage signal change curtage in good time and export to drive each LED lamp, thus the brightness of in good time change LED lamp.The variation of each LED lamp brightness can produce stack arriving after prism on light guide plate, according to optical theory by the different coloramas various colors that superpose out.
The invention has the beneficial effects as follows: (1) real-time is good, after control circuit is processed picture signal, just can directly export control signal to LED, and the luminance brightness that makes it output changes immediately; (2) simple in structure, be easy to manufacture; (3) be easy to the casing internal temperature and control, can reach the purpose of brightness and color while dynamic response with a small amount of lamp; (4) the color representation ability is high, and the application of RGB LED has improved the ability of back light system aspect color displays greatly; (5) easy to implement, the present invention, because not changing original optical system, therefore only need get final product by Jia Ru Pinch circuit processed in existing product.
Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and real protection scope of the present invention should be defined by the claims.
Claims (9)
1. the dynamic light adjustment device of a LED-backlit, is characterized in that, described device comprises:
Invention master control borad and LED-backlit system, described master control borad is comprised of control circuit (4) and driving power circuit (5); Wherein, invent described control circuit (4) and be connected with driving power circuit (5) with the external image unit, receive external image signal and export after treatment control signal to described driving power circuit;
Described driving power circuit (5) also is connected with described LED-backlit system, according to the described control signal received, exports the driving signal of real-time change to described LED-backlit system.
2. device according to claim 1, is characterized in that, described LED-backlit system is side type LED-backlit system.
3. device according to claim 1 and 2, is characterized in that, described LED-backlit system is the color LED backlight system.
4. device according to claim 3, it is characterized in that, described color LED backlight system is comprised of light guide plate (1), prism (2) and color LED lamp bar (3), luminosity according to the driving signal controlling color LED of the described real-time change received forms different colours after described prismatic refraction on described light guide plate.
5. device according to claim 4, is characterized in that, described color LED lamp bar (3) is comprised of a plurality of independent LED unit of controlling each other, the corresponding described prism (2) in each LED unit.
6. device according to claim 5, is characterized in that, each described LED unit is become by the LED knob of different colours, the curtage difference that the LED of each different colours receives.
7. device according to claim 6, is characterized in that, the described LED by different colours is comprised of red LED and green LED and forms, or is comprised of red LED and blue led, or is comprised of red LED, green LED and blue led.
8. device according to claim 1, is characterized in that, described driving power circuit (5) comprising: invention receives the voltage input end mouth (9) of the operating voltage of described master control borad;
Receive the control signal input port (6 ') of described control signal;
For described control circuit provides the Voltage-output port (10) of operating voltage;
Export the driver output port (7) of the driving signal of described real-time change.
9. device according to claim 1, is characterized in that, described control circuit is exported described control signal to described driving power circuit by spi bus or 12C bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210174931 CN103456270A (en) | 2012-05-31 | 2012-05-31 | Dynamic dimming device for LED backlight |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210174931 CN103456270A (en) | 2012-05-31 | 2012-05-31 | Dynamic dimming device for LED backlight |
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| CN103456270A true CN103456270A (en) | 2013-12-18 |
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| CN 201210174931 Pending CN103456270A (en) | 2012-05-31 | 2012-05-31 | Dynamic dimming device for LED backlight |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115164169A (en) * | 2022-09-07 | 2022-10-11 | 江西星原智光科技有限公司 | Silicon substrate multi-primary-color lamp full-color adjusting method and lighting equipment |
-
2012
- 2012-05-31 CN CN 201210174931 patent/CN103456270A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115164169A (en) * | 2022-09-07 | 2022-10-11 | 江西星原智光科技有限公司 | Silicon substrate multi-primary-color lamp full-color adjusting method and lighting equipment |
| CN115164169B (en) * | 2022-09-07 | 2022-11-11 | 江西星原智光科技有限公司 | Silicon substrate multi-primary-color lamp full-color adjusting method and lighting equipment |
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Application publication date: 20131218 |