CN102820009A - Display backlight unit - Google Patents
Display backlight unit Download PDFInfo
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- CN102820009A CN102820009A CN 201110150481 CN201110150481A CN102820009A CN 102820009 A CN102820009 A CN 102820009A CN 201110150481 CN201110150481 CN 201110150481 CN 201110150481 A CN201110150481 A CN 201110150481A CN 102820009 A CN102820009 A CN 102820009A
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- back light
- jiaos
- impedance matching
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- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a display backlight unit used for liquid crystal displays. The display backlight unit comprises an electric energy conversion circuit, a plurality of backlight light sources, at least one impedance matching circuit and a time schedule controller. The backlight light sources are arranged on side faces of a display according to a certain rule and are connected to the electric energy conversion circuit, and the electric energy conversion circuit provides stabilized voltage for the backlight light sources. Each impedance matching circuit is connected to the backlight light sources positioned at four corners of the display. The time schedule controller is connected to each impedance matching circuit, detects the screen brightness displayed by the liquid crystal display, judges the dimming level of the backlight light sources at the four corners and sends control signals to each impedance matching circuit, and the impedance matching circuit reduces the current or the voltage of the backlight light sources at the four corners of the display so as to reduce the brightness of the backlight light sources at the four corners of the display.
Description
Technical field
The invention relates to a kind of back light for display device, and particularly do the back light for display device of brilliance control relevant for a kind of back light to the corner.
Background technology
The principle of LCD is for utilizing backlight module as backlight, and the brightness that turns to degree and then control light source to pass through of control liquid crystal, corresponds on the panel picture element separately afterwards and demonstrates picture.LCD is then for using light emitting diode (light-emitting diode in recent years; LED) as backlight; And see through the electric energy change-over circuit and provide a stable voltage to make LED luminous; This framework can significantly reduce the required consumed power of LCD, more can make the LCD slimming.
Desire to reach this framework, as shown in Figure 1, Fig. 1 is the circuit framework figure of the back light for display device of prior art.The back light for display device 100 of prior art mainly produces voltage so that LED is luminous by the one drive circuit framework, and its circuit framework mainly comprises electric energy change-over circuit 11 and some light emitting diodes 12.Wherein, electric energy change-over circuit 11 is generally buck/boost DC converting circuit (buck or boost DC-DC converter).
Industry is the most often taked led light source to survey formula light inlet mode at present, can reduce by LED number, reaches the effectiveness of saving cost.As shown in Figure 2, Fig. 2 places configuration diagram for the led light source side entering type.Survey formula light inlet mode can be divided into about, up and down, Dan Zuo, single right, list gone up, single inferior light inlet mode, about label 21 ~ 26 indicated light inlet modes are represented respectively among the figure, Dan Zuo, single right, up and down, light inlet mode on the list, under the list.
Yet, light inlet mode shown in Figure 2, four corner brightnesses of display are higher in the time of in practical application, can causing dark attitude, are referred to as four jiaos of light leak aberration (Mura), and this phenomenon causes image quality not good, and it forms reason and still can't confirm at present.In any case this situation not only causes the client to complain, also has influence on the viewing quality of End-Customer.
Fig. 3 is the design sketch that solves four jiaos of light leakage phenomena in the prior art.Four jiaos of light leak synoptic diagram that left side label 31 indicates under the driven, and in the prior art, utilization will be hanged down GTG brightness L0 (minimum brightness that promptly shows black) and improved, and become the synoptic diagram shown in the label 32 of the right afterwards.The method principle improves for hanging down GTG brightness L0, lets four jiaos of light leaks when dark attitude, alleviates its phenomenon owing to low GTG brightness improves L0.
That is, will hang down GTG brightness L0 and improve, let the client when dark attitude picture is observed; Make its four jiaos of light leakage phenomena more not obvious, its shortcoming will be for after will hanging down GTG brightness L0 raising, and overall contrast will descend; That is under identical contrast specification, if use low GTG brightness L0 to improve to improve the method for four jiaos of light leaks, its display maximum brightness must improve; With up to specification, but not only need increase LED number thus, and its improvement degree is also limited with increase brightness.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide the back light for display device that a kind of back light to the corner is done brilliance control.
The present invention proposes a kind of back light for display device, is used for LCD.This back light for display device comprises electric energy change-over circuit, some back lights, at least one impedance matching circuit and time schedule controller.Some back lights are positioned over display side with certain rule, and are connected to this electric energy change-over circuit, and this electric energy change-over circuit provides stable voltage to these some back lights.This at least one impedance matching circuit is connected to the back light that is positioned at four jiaos of displays.This time schedule controller is connected to this at least one impedance matching circuit; The picture brightness of this time schedule controller detecting liquid crystal display displays; Judge the light modulation degree of four jiaos back light; And send and control signal to this at least one impedance matching circuit, this at least one impedance matching circuit reduces the curtage of the back light of four jiaos of displays, to reduce the back light brightness of four jiaos of displays.
In one embodiment of the invention, this electric energy change-over circuit is the buck/boost DC converting circuit.
In one embodiment of the invention, these some back lights comprise some light emitting diodes.
In one embodiment of the invention, this at least one impedance matching circuit is the heavy circuit of at least one electric current.
In one embodiment of the invention, the heavy circuit of this at least one electric current is connected to the back light that is positioned at four jiaos of displays respectively, and all is connected to this time schedule controller.
In sum; The present invention utilizes an electric energy change-over circuit to provide a stable voltage to make LED luminous; And utilize the heavy LED that is connected to four jiaos of corresponding displays of electric current, and see through T-con detecting picture, use the light modulation degree of the LED that judges four jiaos; Use the phenomenon that reaches four jiaos of light leaks of improvement, and need not to increase the quantity of LED.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of instructions, and for let above and other objects of the present invention, feature and advantage can be more obviously understandable, below special act embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the circuit framework figure of the back light for display device of prior art.
Fig. 2 places configuration diagram for the led light source side entering type.
Fig. 3 utilizes prior art to solve the design sketch of four jiaos of light leakage phenomena.
Fig. 4 is the circuit framework figure of the back light for display device of preferred embodiment of the present invention.
Fig. 5 solves the design sketch of four jiaos of light leakage phenomena for the back light for display device of preferred embodiment of the present invention.
Embodiment
See also shown in Figure 4ly, Fig. 4 is the circuit framework figure of the back light for display device of preferred embodiment of the present invention.In the present invention's one preferred embodiment, the circuit framework of back light for display device 400 comprises electric energy change-over circuit 41, some back lights, time schedule controller (T-con) 43 and electric current heavy (figure is mark not).In the present embodiment, be that some LED 42 are that example describes with some back lights, wherein, LED 421,422 representatives are placed on the light emitting diode of four jiaos of back lights.Electric energy change-over circuit 41 is connected to the back light that is made up of some LED 42, produces voltage so that LED is luminous.T-con 43 is connected to the LED 421 and 422 that is placed on four jiaos of displays.And then, be connected the heavy circuit (current sink) 441,442 of an electric current between T-con 43 and the LED 421 and 422 that is placed on four jiaos of back lights more respectively.
Electric energy change-over circuit 41 is buck/boost DC converting circuit (buck or boost DC-DC converter), and its voltage that is used to provide stable is to LED 42, so that LED 42 is normally luminous.
T-con 43 operated by rotary motion are used for converting TV images to signal that LCD can show between TV images output and LCD.In the present invention, the picture brightness of T-con 43 detecting liquid crystal display displays, and judge the light modulation degree of four jiaos LED 421,422, and send and control signal to the heavy circuit 441,442 of electric current.The heavy circuit 441,442 of electric current obtains electric current from the LED 421,422 of its connection and leaves LED 421,422, to reduce by four jiaos LED brightness, four jiaos light leakage phenomena is disappeared, and improves whole display quality.
Please further with reference to figure 5, Fig. 5 solves the design sketch of four jiaos of light leakage phenomena for the back light for display device of preferred embodiment of the present invention.Like Fig. 5 left side diagram, be example with left and right sides light inlet mode, the brightness of the LED 421,422 through reducing by four jiaos of displays reaches the light of even whole image, improves whole viewing quality.Effect after the improvement such as Fig. 5 the right diagram, relative prior art, four jiaos light leak disappears now.
Be appreciated that back light for display device according to the invention, can be used in the LCD of various different sizes.The quantity of LED shown in Fig. 4 is not exceeded with four, can increase or reduce according to the display needs.Correspondingly, the quantity that electric current is heavy is not exceeded with two yet, can be decided by the LED quantity that is placed on four jiaos.In addition; The heavy circuit 441,442 of electric current also is substitutable for other impedance matching circuits, obtains current/voltage from the LED 421,422 of its connection and leaves LED 421,422, to reduce by four jiaos LED brightness; Four jiaos light leakage phenomena is disappeared, improve whole display quality.
In sum; The present invention utilizes an electric energy change-over circuit to provide a stable voltage to make LED luminous, and utilizes the heavy LED that is connected to four jiaos of corresponding displays of electric current, and sees through T-con detecting picture; Use the light modulation degree of the LED that judges four jiaos; Use and reach the phenomenon that substantially improves four jiaos of light leaks, keep bright dark contrast originally, and need not to increase the quantity of LED.
The above only is embodiments of the invention, is not the present invention is done any pro forma restriction; Though the present invention discloses as above with embodiment; Yet be not in order to limiting the present invention, anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (5)
1. a back light for display device is used for LCD, and this back light for display device comprises:
The electric energy change-over circuit;
Some back lights are positioned over display side with certain rule, and these some back lights are connected to this electric energy change-over circuit, and this electric energy change-over circuit provides stable voltage to these some back lights;
At least one impedance matching circuit is connected to the back light that is positioned at four jiaos of displays;
Time schedule controller; Be connected to this at least one impedance matching circuit; The picture brightness of this time schedule controller detecting liquid crystal display displays is judged the light modulation degree of four jiaos back light, and sends and control signal to this at least one impedance matching circuit; This at least one impedance matching circuit reduces the curtage of the back light of four jiaos of displays, to reduce the back light brightness of four jiaos of displays.
2. back light for display device according to claim 1 is characterized in that, this electric energy change-over circuit is the buck/boost DC converting circuit.
3. back light for display device according to claim 1 is characterized in that, these some back lights comprise some light emitting diodes.
4. back light for display device according to claim 1 is characterized in that, this at least one impedance matching circuit is the heavy circuit of at least one electric current.
5. back light for display device according to claim 4 is characterized in that, the heavy circuit of this at least one electric current is connected to the back light that is positioned at four jiaos of displays respectively, and all is connected to this time schedule controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110150481 CN102820009A (en) | 2011-06-07 | 2011-06-07 | Display backlight unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110150481 CN102820009A (en) | 2011-06-07 | 2011-06-07 | Display backlight unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102820009A true CN102820009A (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110150481 Pending CN102820009A (en) | 2011-06-07 | 2011-06-07 | Display backlight unit |
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| CN (1) | CN102820009A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351778A (en) * | 2015-11-20 | 2016-02-24 | 宁波多力浦工贸有限公司 | Improved bulb lamp |
| WO2020237624A1 (en) * | 2019-05-31 | 2020-12-03 | 华为技术有限公司 | Laser diode drive circuit and method, and laser scanning device |
-
2011
- 2011-06-07 CN CN 201110150481 patent/CN102820009A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351778A (en) * | 2015-11-20 | 2016-02-24 | 宁波多力浦工贸有限公司 | Improved bulb lamp |
| WO2020237624A1 (en) * | 2019-05-31 | 2020-12-03 | 华为技术有限公司 | Laser diode drive circuit and method, and laser scanning device |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121212 |