CN101154351A - Dynamic back light source module group for video controlling brightness and chroma of LED - Google Patents
Dynamic back light source module group for video controlling brightness and chroma of LED Download PDFInfo
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- CN101154351A CN101154351A CNA2006101522540A CN200610152254A CN101154351A CN 101154351 A CN101154351 A CN 101154351A CN A2006101522540 A CNA2006101522540 A CN A2006101522540A CN 200610152254 A CN200610152254 A CN 200610152254A CN 101154351 A CN101154351 A CN 101154351A
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Abstract
The invention relates to a dynamic backlight source module of video controlling brightness and chrominance of LEDs, comprising a circuit board, a light-guiding element, a diffused component and a control unit, wherein, the circuit board is provided with a plurality of groups of light sources, and each group of light sources consists of LEDs with three colors including a red color, a green color and a blue color, the light sources are connected with the circuit board; the light-guiding element is arranged on the circuit board and covers the light sources; the diffused component is arranged above the light-guiding element; the control unit receives a video signal and a synchronized signal and outputs a plurality of dynamic control signals to control the brightness and chrominance of each LED in the light sources, thereby the brightness and chrominance of each LED change synchronously with the brightness and chrominance of areas corresponding to the video signal, and the video signal has no color component and the LEDs corresponding to the video signal do not illuminate, while the LEDs corresponding to the color component with low brightness in the video signal illuminate less according to proportions.
Description
Technical field
The present invention relates to the dynamic backlight source module of a kind of video control LED brightness and colourity, the dynamic backlight source module of particularly a kind of video control LED brightness and colourity.
Background technology
Liquid crystal display device (LCD) is widely used in very wide fields such as computing machine LCDs, LCD TV, outdoor advertising.But LCD display board itself is not luminous, and provides light source by the backlight source module that is arranged at the LCD display below, forms the coloured image of different brightness, different color and different gray scales by the pixel electrode on the control LCDs.So module backlight is one of key component of LCD.Backlight source module is divided into straight-down negative module (light source places under the backlight source module) and side-light type module (light source places the backlight source module side) according to the light source position; The backlight source module that then is divided into light emitting diode (LED) and cold cathode ray tube multiple light sources such as (CCFL) by light source part.The present invention is the direct LED backlight module.Because the light source of direct-light-type backlight module under display screen, therefore can satisfy the demand of higher brightness or large-size display screen.Because selecting LED for use is the light source of backlight source module, and with unit of red, green, blue three-color LED composition, a backlight source module is made up of one or several unit.Each unit is corresponding with corresponding LCD zone, and therefore, the brightness of backlight source module and colourity just have the feasibility of synchro control.
Fig. 1 is the graph of a relation of known LCDs LCD and backlight source module.
As shown in Figure 1, the brightness of backlight source module is by the constant voltage and the steady current decision of power supply.Behind the red, green, blue Tricolor LED mixed color, send invariable white light, and irrelevant with the brightness and the colourity of vision signal.When vision signal was non-white light, a part or most light had ended to fall in the white light that former module backlight sends.As shown in Figure 5, the pattern that a width of cloth is made up of blue sky, greenery, safflower in the display part, blue sky, has only blue light can see through LCD in the white light that backlight source module is sent, and screen shows for blue, and ruddiness and green glow are cut off.In like manner, in the greenery display part, ruddiness and blue light are cut off; In the safflower display part, green glow and blue light are cut off.Even video is a black, all light is cut off, and the red, green, blue LED of backlight source module still sends 100% light.In coloured image, the probability that long white video pictures occurs is less.Only some is utilized the white light that visible backlight source module sends in most of times, and the light of another part is cut off, and has caused energy dissipation.Moreover, these luminous energy that are wasted change into heat energy, and the electron device on backlight source module and the LCD is caused temperature rise, make its lost of life.
Because the Liquid Crystal Molecules Alignment order parameter of LCD can not reach 1, and the vertical shading rate of polaroid also can not reach 100%, so the color that should be cut off in the white light still is that some displays through LCD, mixed color phenomenon promptly occurs, colored color saturation is reduced.The color saturation of known backlit source module LCD has only about 70%, causes the distortion of brightness and color.
Summary of the invention
The purpose of this invention is to provide a kind of direct-light-type backlight module of forming with the red, green, blue three-primary color LED, the brightness of this backlight source module and colourity are by dynamic control circuit and dynamic driver circuit control.Brightness, the colourity of each LED are changed with brightness, the colourity dynamic synchronization in the corresponding zone of vision signal.Make the color composition that does not have in the vision signal, its corresponding LED is not luminous; And the low color composition of brightness in the vision signal, its corresponding LED is few in proportion luminous.Thereby reach energy savings, reduce the temperature rise of the electron device on backlight source module and the LCD, prolong the serviceable life of LCDs LCD, improve the purpose of LCD color saturation.
To achieve these goals, the invention provides the dynamic backlight source module of a kind of video control LED brightness and colourity, be applicable to LCDs, be arranged on the below of described LCDs, it comprises: circuit board, described circuit board is provided with multiple sets of light sources, and every group of light source is made up of the LED of three kinds of colors of red, green, blue, and described light source is electrically connected with circuit board; Light-guide device is arranged on the described circuit board, covers described light source; Diffused component is arranged on described light-guide device top; Control module, this control module receiving video signals and synchronizing signal, and export dynamic control signal, control brightness and the colourity of each LED in the described light source.
The present invention further optimization scheme is: described control module comprises dynamic control circuit and a plurality of dynamic driver circuit of being made up of discrete electronic component or integrated circuit, described dynamic control circuit receiving video signals and synchronizing signal, and this vision signal carried out conversion process, export the multichannel dynamic control signal then, said process is controlled by synchronizing signal; Described a plurality of dynamic driver circuit receives the multichannel dynamic control signal that dynamic control circuit transmits, and it is carried out power amplification, and output signal is then controlled brightness and the colourity of each LED in the described light source.
The present invention further optimization scheme is: also be provided with by shell, described backlight source module is enclosed in this shell, and shell can adopt metal material to make simultaneously, serves as heat sink material.
The present invention further optimization scheme is: each LED periphery is provided with at least one via hole on the described circuit board, is provided with Copper Foil in described via hole, thereby helps light source is dispelled the heat.
The present invention further optimization scheme is: described circuit board bottom is disposed with reflecting element and heat dissipation element, makes backlight source module reduce the generation of light leak, also helps its heat radiation, reduces its temperature rise.
The present invention further optimization scheme is: described light-guide device top is disposed with brightness enhancement film and dispersing element, can further strengthen the effect of backlight source module.
The present invention further optimization scheme is: described light source mode by matrix array on circuit board is arranged, certainly, also can install other clocklike mode arrange.
The advantage that the present invention had: its light source is many groups red (R), green (G), blue (B) LED is formed, arrange by matrix-style between every group of light source, the input signal that from vision signal, extracts, carry out conversion of signals through dynamic control circuit, and controlled by synchronizing signal, the dynamic control signal of output is delivered to dynamic driver circuit, after dynamic driver circuit carries out power amplification to dynamic control signal, the brightness and the colourity of each unit LED in the control backlight source module, and make it to keep dynamic synchronization to change with the brightness and the colourity of the vision signal in corresponding zone, to reach the saving energy, reduce the backlight source module temperature, prolong LED-backlit source module serviceable life, improve the purpose of LCD coloured image color saturation.
Above-mentioned and additional features, advantage of the present invention can further be understood by the detailed description below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is known direct-light-type backlight and LCD structural drawing;
Fig. 2 is the dynamic backlight source module and the LCD structural drawing of a kind of video control LED brightness of the present invention and colourity;
Fig. 3 is the dynamic backlight source module of a kind of video control LED brightness of the present invention and colourity;
Fig. 4 arranges synoptic diagram for straight-down negative red, green, blue three-primary color LED matrix form of the present invention;
Fig. 5 is red, green, blue three primary colours of the present invention and video luminance signal, chrominance synchronization special case synoptic diagram.
Description of reference numerals: circuit board 1; Display screen 10; Light source 11; LED 111; Via hole 12; Light-guide device 2; Diffused component 3; Control module 4; Dynamic control circuit 41; Dynamic driver circuit 42; Reflecting element 51; Heat dissipation element 52; Brightness enhancement film 53; Dispersing element 54; Shell 55.
Embodiment
As shown in Figures 2 and 3, the invention provides the dynamic backlight source module of a kind of video control LED brightness and colourity, it is applicable to LCDs, and be positioned over the below of this LCDs 10, described backlight source module includes circuit board 1, light-guide device 2, diffused component 3 and control module 4, wherein:
Described circuit board 1 is provided with multiple sets of light sources 11, light source 11 is arranged by mode clocklike on circuit board 1, such as in the present embodiment, as shown in Figure 4, it is to arrange by the mode of matrix array, every group of light source 11 is made up of the LED 111 of red (R), green (G), blue (B) three kinds of colors, and described light source 11 and circuit board 1 are electrically connected by lead; The periphery of each LED 111 is provided with at least one via hole 12 on described circuit board 1, and the purpose that via hole 12 is set is in order to transmit the heat that LED 111 is sent, to reduce light source 11 temperature in use; In addition, in order further to strengthen radiating effect, can in described via hole 12, Copper Foil be set and dispel the heat.
Described light-guide device 2 is arranged on the described circuit board 1, covers described light source 11, and light source 11 is connected the lead sealing with it, and described light-guide device 2 is drawn the photoconduction that light source 11 sends, until following diffused component 3; In addition, light-guide device 2 also can have good heat-conducting simultaneously, and can help LED is dispelled the heat.
Described diffused component 3 is arranged on described light-guide device 2 tops, receives the light from light-guide device 2 conduction, and it is spread out, and is used for providing even brightness light to LCDs 10.
Described control module 4 is to be used for receiving video signals V and synchronizing signal S, and output dynamic control signal D, controls brightness and the colourity of each LED 111 in the described light source 11.As shown in Figures 2 and 3, described control module 4 comprises dynamic control circuit 41 and a plurality of dynamic driver circuit of being made up of discrete electronic component or integrated circuit 42, described dynamic control circuit 41 receiving video signals V and synchronizing signal S, and this vision signal V carried out conversion process, export multichannel dynamic control signal D then, this dynamic control signal D can be voltage pulse-amplitude modulation signal (PAM-V), electric current pulse-amplitude modulation signal (PAM-I) or constant current pulse-width signal (PWM-I), and said process is controlled by synchronizing signal S; Described a plurality of dynamic driver circuit 42 receives the multichannel dynamic control signal D that dynamic control circuit 41 transmits, it is carried out power amplification, output signal is then controlled brightness and the colourity of each LED 111 in the described light source 11, and itself and corresponding video are kept synchronously.
Above-mentioned control procedure can be carried out in the following manner, every road dynamic control signal D such as described dynamic control circuit 41 outputs controls one or more dynamic driver circuits 42 respectively, and the signal of each dynamic driver circuit 42 output also can be controlled one group of light source 11 or multiple sets of light sources 11.In the present embodiment, preferably, the number of the way of dynamic control signal D and dynamic driver circuit 42 equates with the group number of described light source 11, just, every road dynamic control signal D of dynamic control circuit 41 outputs controls a dynamic driver circuit 42 respectively, and the signal of each dynamic driver circuit 42 output is controlled one group of light source 11 respectively, at this moment, the signal of dynamic driver circuit 42 outputs is controlled three LED 111 in one group of light source 11, the i.e. brightness and the switch of R, G, B three-color LED respectively.
In addition, as shown in Figures 2 and 3, reflecting element 51 can also be set, make the light that drains to circuit board 1 lower surface reflex to the upper surface of circuit board 1, reduce the light leak of light source 11, improve its utilization factor in the bottom of described circuit board 1; Heat dissipation element 52 can also be set in the bottom of described reflecting element 51, the heat that light source 11 produces can be distributed like this.
In order further to improve the effect of this backlight source module, can further above described diffused component 3, brightness enhancement film 53 be set, and dispersing element 54 is set above brightness enhancement film 53; Brightness enhancement film 53 can concentrate on the light of all directions in the one less visual angle uniformly, and brightness is improved.
In addition, shell 55 can also be set, each parts of above-mentioned backlight source module are all surrounded into, preferably, as shown in Figures 2 and 3, described heat dissipation element 52 contacts with described shell 55, and shell adopts the thermal conductivity good metal to make, and like this, the heat that heat dissipation element 52 conduction are come out can further distribute by metal shell 55, thereby help the heat radiation of backlight source module more, reduce its temperature rise.
The present invention from constant voltage and Current Control, change over and the control of vision signal dynamic synchronization, and the dynamic maximal value of power consumption equates LED with the steady state value of static state.As shown in Figure 5, in the backlight source module of the present invention can be, X has only in the district blue led bright, and Y has only in the district green LED bright, and the Z district has only red LED bright, and if blank screen, all LED do not work; So reached energy savings, reduce LCD and backlight source module temperature rise, prolong the LCD purpose in serviceable life.LED is subjected to the control of dynamic control circuit among the present invention, makes the color composition that does not have in the vision signal, and its corresponding LED is not luminous; And the low color composition of brightness in the vision signal, its corresponding LED is few in proportion luminous.Thereby mixed color phenomenon can not appear, and colored color saturation is improved, the degree of distortion of color is descended significantly, also make each LED not be always operating under the full load simultaneously, this has also saved the energy.
Be to be understood that, the above illustrative and nonrestrictive just for the purpose of the present invention of explanation in conjunction with the embodiments, without departing from the spirit and scope of the present invention, can make many changes and modification to the present invention, it all will drop in the scope of the invention defined by the claims.
Claims (10)
1. the dynamic backlight source module of video control LED brightness and colourity is applicable to LCDs, is arranged on the below of described LCDs, it is characterized in that, comprising:
Circuit board, described circuit board is provided with multiple sets of light sources, and every group of light source is made up of the LED of three kinds of colors of red, green, blue, and described light source is electrically connected with circuit board;
Light-guide device is arranged on the described circuit board, covers described light source;
Diffused component is arranged on described light-guide device top;
Control module, this control module receiving video signals and synchronizing signal, and export dynamic control signal, control brightness and the colourity of each LED in the described light source.
2. the dynamic backlight source module of video control LED brightness as claimed in claim 1 and colourity, it is characterized in that: described control module comprises dynamic control circuit and a plurality of dynamic driver circuit of being made up of discrete electronic component or integrated circuit, described dynamic control circuit receiving video signals and synchronizing signal, and this vision signal carried out conversion process, export the multichannel dynamic control signal then, said process is controlled by synchronizing signal; Described a plurality of dynamic driver circuit receives the multichannel dynamic control signal that dynamic control circuit transmits, and it is carried out power amplification, and output signal is then controlled brightness and the colourity of each LED in the described light source.
3. the dynamic backlight source module of video control LED brightness as claimed in claim 1 or 2 and colourity, it is characterized in that: also be provided with by shell, described backlight source module is enclosed in this shell.
4. the dynamic backlight source module of video control LED brightness as claimed in claim 1 or 2 and colourity, it is characterized in that: each LED periphery is provided with at least one via hole on the described circuit board.
5. the dynamic backlight source module of video control LED brightness as claimed in claim 4 and colourity is characterized in that: be provided with Copper Foil in the described via hole.
6. the dynamic backlight source module of video control LED brightness as claimed in claim 1 or 2 and colourity, it is characterized in that: described circuit board bottom is provided with reflecting element.
7. the dynamic backlight source module of video control LED brightness as claimed in claim 6 and colourity, it is characterized in that: described reflecting element bottom is provided with heat dissipation element.
8. the dynamic backlight source module of video control LED brightness as claimed in claim 1 or 2 and colourity, it is characterized in that: described light-guide device top is provided with brightness enhancement film.
9. the dynamic backlight source module of video control LED brightness as claimed in claim 8 and colourity, it is characterized in that: described brightness enhancement film top is provided with dispersing element.
10. the dynamic backlight source module of video control LED brightness as claimed in claim 1 or 2 and colourity, it is characterized in that: described light source mode by matrix array on circuit board is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101522540A CN101154351A (en) | 2006-09-27 | 2006-09-27 | Dynamic back light source module group for video controlling brightness and chroma of LED |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101522540A CN101154351A (en) | 2006-09-27 | 2006-09-27 | Dynamic back light source module group for video controlling brightness and chroma of LED |
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| CN101154351A true CN101154351A (en) | 2008-04-02 |
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| CNA2006101522540A Pending CN101154351A (en) | 2006-09-27 | 2006-09-27 | Dynamic back light source module group for video controlling brightness and chroma of LED |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572977A (en) * | 2008-04-30 | 2009-11-04 | 苏锦标 | Illuminating system |
| CN103035217A (en) * | 2011-10-10 | 2013-04-10 | 吴小平 | Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight |
| CN103680423A (en) * | 2013-12-09 | 2014-03-26 | 合肥京东方光电科技有限公司 | Method and system for controlling local color gamut, backlight source and display device |
| CN104599643A (en) * | 2015-02-13 | 2015-05-06 | 合肥京东方光电科技有限公司 | Adjustable backlight equipment, display equipment and utilization method of adjustable backlight equipment |
| CN106796774A (en) * | 2014-10-03 | 2017-05-31 | Eizo 株式会社 | The colour temperature establishing method of display device, display system, the colour temperature setting program of display device, the colour temperature determining method of display device |
| CN110501842A (en) * | 2018-05-18 | 2019-11-26 | 深圳Tcl新技术有限公司 | A kind of backlight module and display device |
| CN110837192A (en) * | 2018-08-16 | 2020-02-25 | 深圳Tcl新技术有限公司 | Liquid crystal display backlight module |
-
2006
- 2006-09-27 CN CNA2006101522540A patent/CN101154351A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572977A (en) * | 2008-04-30 | 2009-11-04 | 苏锦标 | Illuminating system |
| CN103035217A (en) * | 2011-10-10 | 2013-04-10 | 吴小平 | Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight |
| CN103680423A (en) * | 2013-12-09 | 2014-03-26 | 合肥京东方光电科技有限公司 | Method and system for controlling local color gamut, backlight source and display device |
| CN103680423B (en) * | 2013-12-09 | 2016-08-24 | 合肥京东方光电科技有限公司 | A kind of control the local method of colour gamut, system, backlight and display device |
| CN106796774A (en) * | 2014-10-03 | 2017-05-31 | Eizo 株式会社 | The colour temperature establishing method of display device, display system, the colour temperature setting program of display device, the colour temperature determining method of display device |
| US10198234B2 (en) | 2014-10-03 | 2019-02-05 | Eizo Corporation | Method for setting color temperature of display device, display system, program for setting color temperature of display, and method for determining color temperature of display |
| CN104599643A (en) * | 2015-02-13 | 2015-05-06 | 合肥京东方光电科技有限公司 | Adjustable backlight equipment, display equipment and utilization method of adjustable backlight equipment |
| US10210819B2 (en) | 2015-02-13 | 2019-02-19 | Boe Technology Group Co., Ltd. | Tunable backlight device, a display device and a method of driving the same |
| CN110501842A (en) * | 2018-05-18 | 2019-11-26 | 深圳Tcl新技术有限公司 | A kind of backlight module and display device |
| CN110837192A (en) * | 2018-08-16 | 2020-02-25 | 深圳Tcl新技术有限公司 | Liquid crystal display backlight module |
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