CN102930830B - A kind of method improving scanning backlight inequality - Google Patents
A kind of method improving scanning backlight inequality Download PDFInfo
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- CN102930830B CN102930830B CN201210424016.6A CN201210424016A CN102930830B CN 102930830 B CN102930830 B CN 102930830B CN 201210424016 A CN201210424016 A CN 201210424016A CN 102930830 B CN102930830 B CN 102930830B
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Abstract
The invention provides a kind of method improving scanning backlight inequality, it is by backlight driver turntable driving, comprises the steps: that scanning backlight being divided into n ((n >=2)) region carries out P-SCAN driving; Be provided with n independently electric current feedback control device in backlight driver, each region adopts independently control circui; Regulate the control circui of regional, the pulse brightness when lamp bar of two side areas is lighted is higher than other regions.The structure that the present invention is controlled by hyperchannel separate current, under controlling through driving LED (light emitting diode) separate current, control brightness when each backlight area is lighted, when scanning backlight is just scanning the block in the most upper and lower both sides, the current value of corresponding passage is increased through regulation and control, when allowing the block of the most upper and lower both sides of backlight light, brightness strengthens, and finally reaches after between backlight block, optics disturbs mutually, and Integral back luminance brightness homogeneity is optimized.
Description
Technical field
The present invention relates to a kind of LCD backlight Drive Control Technique, particularly relate to a kind of method improving scanning backlight inequality.
Background technology
General liquid crystal display is for promoting MPRT(MovingPictureResponseTime: the dynamic image reaction time) or under 3D application, scanning backlight module architectures of roughly arranging in pairs or groups carrys out Improve Efficiency, backlight is distinguished into plural region by scanning backlight usually, area occupied by each region of scanning backlight is consistent haply, and the LED lighting time controlling each region is long too.Because optics disturbs mutually between backlight block, the regional luminance of the most upper and lower both sides of backlight made is partially dark; And other zone line brightness are partially bright, when causing scanning backlight action, Integral back luminance brightness homogeneity is deteriorated.
Figure 1 shows that the schematic diagram in territory, backlight subarea, scanning backlight, under scan-type application, is distinguished into n(n >=2 by LCD backlight) carry out P-SCAN driving under individual regional architecture.
The backlight in each region is numbered Block1, Block2 to Blockn, and wherein Block1 and Blockn belongs to the most two side areas in backlight.
Figure 2 shows that the interference schematic diagram of scanning backlight light, the dotted line in Fig. 2 is the brightness that region backlight lamp bar is lighted, and solid line is that region backlight lamp bar is lighted through for the postrotational brightness of liquid crystal, and the light mean flow rate in Block1 and Blockn region is La1 and Lan; The light mean flow rate in Block2 to Blockn-1 region is La2 to Lan-1, disturbing factor due to light causes La1 and the Lan mean flow rate of scanning backlight block in Block1 and Blockn region lower than other zone leveling brightness La2 to Lan-1, and the homogeneity in n region is bad.
Existing general liquid crystal display collocation scanning backlight carrys out Improve Efficiency, and backlight is distinguished into several block of cells by scanning backlight usually.Because optics disturbs mutually between backlight block, cause the block brightness of the most both sides, up and down of backlight partially dark; And other mesozone Block Brightness are partially bright, when causing scanning backlight action, Integral back luminance brightness homogeneity is deteriorated.
Summary of the invention
The present invention discloses the method for improvement scanning backlight inequality of the structure that a kind of hyperchannel separate current controls, and to reach after between backlight area, optics disturbs mutually, Integral back luminance brightness homogeneity is optimized.
The invention provides a kind of method improving scanning backlight inequality, it, by backlight driver turntable driving, comprises the steps:
Scanning backlight is divided into n ((n >=2)) region and carries out P-SCAN driving;
Be provided with n independently electric current feedback control device in backlight driver, each region adopts independently control circui;
Regulate the control circui of regional, the pulse brightness when lamp bar of two side areas is lighted is higher than other regions.
Described electric current feedback control device control method is as follows:
Be connected to DC voltage after the anode of each area lights bar links together, this DC voltage is changed by DC-DC converting circuit;
The negative electrode of each area lights bar is then independently connected to backlight driver, and the negative electrode of each area lights bar is first connected to the source electrode of MOSFET, and the grid of MOSFET is connected to the output of comparer;
Positive pole input connection DC reference voltage level of comparer, the feedback voltage level of a negative pole input connection resistance of comparer;
The drain electrode of MOSFET is connected to a resistance;
Each area lights bar all independently arranges tune and establishes resistance, and the electric current back coupling controlling resistance value arranging two side areas is less than other area resistance value.
The structure that the present invention is controlled by hyperchannel separate current, under controlling through driving LED separate current, control brightness when each backlight area is lighted, when scanning backlight is just scanning the block in the most upper and lower both sides, increase the current value of corresponding passage through regulation and control, when allowing the block of the most upper and lower both sides of backlight light, brightness strengthens, and finally reaches after between backlight block, optics disturbs mutually, Integral back luminance brightness homogeneity is optimized, and the present invention can also be used for eliminating Mura technology.
Accompanying drawing explanation
Fig. 1 is the subregional schematic diagram of scanning backlight;
Fig. 2 is the interference schematic diagram in territory, backlight subarea shown in Fig. 1;
Fig. 3 is the structural representation of scanning backlight of the present invention and backlight driver;
Fig. 4 is the principle schematic of the recirculation control device of backlight driver of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
The present invention discloses a kind of method improving scanning backlight inequality, this method is used for LCD backlight under scan-type application, as shown in Figure 3, scanning backlight is distinguished into n(n >=2) carry out P-SCAN driving under individual region, the backlight in each region is numbered Block1, Block2 to Blockn, and wherein Block1 and Blockn belongs to the most two side areas in backlight.
This scanning backlight first region Block1 and last region Blockn, only has about this two region and has other regions (Block2-Blockn-1); And second area Block2 to last penultimate region Blockn-1, these region the right and lefts all have other region backlights.
Be a direct supply by backlight driver (LEDConverter) 10 input voltage, backlight lamp bar 40 is become to drive required voltage voltage transitions through DC-DC circuit (DC/DC) 30, this lamp bar 40 driving voltage is connected to the anode (P) of each area lights bar of backlight, and the anode of each area lights bar all links together.The negative electrode of each area lights bar is then independently connected to backlight driver 10, backlight driver 10 is respectively equipped with independently electric current feedback control device (CurrentSink*n) 20 for each area lights bar, this electric current feedback control device (CurrentSink*n) 20 is equivalent to current mirror function, the size of current that determining area lamp bar flows through, also the light on and off of gated sweep formula backlight block lamp bar, reach backlight scan function and the accurate adjustment object of brightness simultaneously.
Described lamp bar 40 is straight-down negative or side entering type lamp bar, and the backlight lamp bar in each region can independently come control voltage or electric current.
This scanning backlight drives the driver of lamp bar 40 to have several control channel of independently feedbacking, and each back coupling passage all can independently be controlled, and backlight driver (LEDConverter) 10 independently can regulate and control the lamp bar of each region backlight.
Reach by this electric current feedback control device (CurrentSink*n) 20 circuit size that each area lights bar flows through can independently control, in backlight, the electric current of two side areas Block1 and Blockn is feedback controlling resistance value R1 and Rn and is less than other region (Block2 to Blockn-1) resistance values R2 to Rn-1.The brightness of most two side areas Block1 and the Blockn in backlight increases brightness by originally partially dark because turning R1 and Rn down, and other zone line brightness remain unchanged, Integral back luminance brightness homogeneity optimization when making to adjust rear scanning backlight action.
Scanning backlight first region Block1 and last region Blockn, these two blocks adopt separate current or Current Control, pulse brightness when regulating the backlight lamp bar of these two regions (Block1 and Blockn) to light, pulse brightness when the lamp bar in these two regions is lighted is higher than other regions, finally reach after between backlight block, optics disturbs mutually, Integral back luminance brightness homogeneity is optimized.
Electric current feedback control device (CurrentSink) 20 is divided into 1 to n passage, and each passage independently controls corresponding Block1 ~ Blockn.
The principle of the electric current feedback control device (CurrentSink) of backlight driver as shown in Figure 4, be connected to DC voltage (Vout) after the anode of each area lights bar links together, this DC voltage (Vout) can be changed by DC-DC converting circuit (DC/DC) 30 and form.The negative electrode of each area lights bar is then independently connected to backlight driver 10, the negative electrode of each area lights bar is first connected to the source electrode of MOSFET, the grid of MOSFET is connected to the output of comparer (Buffer), positive pole input connection DC reference voltage level (Vref) of comparer (Buffer); The feedback voltage level (VA) of a negative pole input connection resistance R of comparer (Buffer), the drain electrode of MOSFET is connected to a resistance R.Each area lights bar all independently arranges tune and establishes resistance R, and in first area, lamp bar arranges R1; At second area lamp bar, R2 is set; In the end area lights bar arranges Rn.The resistance value of R1 and Rn, under scanning backlight application, if R1 and Rn distinguishes the most both sides block in gated sweep formula backlight, can be turned down the resistance value in R2 to Rn-1 by the present invention.
By the resistance value of R1 and Rn being turned down the resistance value in R2 to Rn-1, the brightness of two side areas Block1 and the Blockn in backlight is made to increase brightness by originally partially dark because turning R1 and Rn down, other zone line brightness remain unchanged, Integral back luminance brightness homogeneity optimization when making to adjust rear scanning backlight action.
The structure that the present invention is controlled by hyperchannel separate current, under controlling through driving LED separate current, control brightness when each backlight area is lighted, when scanning backlight is just scanning the block in the most upper and lower both sides, increase the current value of corresponding passage through regulation and control, when allowing the block of the most upper and lower both sides of backlight light, brightness strengthens, and finally reaches after between backlight block, optics disturbs mutually, Integral back luminance brightness homogeneity is optimized, and the present invention can also be used for eliminating Mura technology.
Claims (3)
1. improve a method for scanning backlight inequality, it, by backlight driver turntable driving, is characterized in that, comprises the steps:
Scanning backlight is divided into n region and carries out P-SCAN driving, wherein, n >=2;
Be provided with n independently electric current feedback control device in backlight driver, electric current feedback control device is equivalent to current mirror function, the size of current that determining area lamp bar flows through, simultaneously the light on and off of also gated sweep formula backlight block lamp bar;
Each region adopts independently control circui, DC voltage is connected to after the anode of each area lights bar all links together, this DC voltage can be changed by DC-DC converting circuit, the negative electrode of each area lights bar is independently connected to backlight driver, the negative electrode of each area lights bar is first connected to the source electrode of MOSFET, and the grid of MOSFET is connected to the output of comparer; Positive pole input connection DC reference voltage level of comparer, the feedback voltage level of a negative pole input connection resistance of comparer; The drain electrode of MOSFET is connected to a resistance; Each area lights bar all independently arranges tune and establishes resistance, and the electric current back coupling controlling resistance value arranging two side areas is less than other area resistance value, and the voltage of the backlight lamp bar in each region or electric current independently control by electric current feedback control device;
By electric current feedback control device, regulate the control circui of regional, the pulse brightness when lamp bar of two side areas is lighted is higher than other regions; The electric current back coupling controlling resistance value of two side areas is less than other area resistance value; Electric current feedback control device is divided into 1 to n passage, and each passage independently controls each self-corresponding region; The left and right in first region and last region only has while there are other regions, and second area all has other region backlights to the right and left in last penultimate region.
2. the method improving scanning backlight inequality according to claim 1, is characterized in that: described backlight driver input voltage is a direct supply, becomes backlight lamp bar to drive required voltage voltage transitions through DC-DC circuit.
3. the method improving scanning backlight inequality according to claim 1, is characterized in that: described lamp bar is straight-down negative or side entering type lamp bar.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101197109A (en) * | 2007-04-19 | 2008-06-11 | 友达光电股份有限公司 | Current feedback and compensation circuit, led driving device and backlight system |
| CN101772237A (en) * | 2008-12-31 | 2010-07-07 | 凹凸电子（武汉）有限公司 | Circuit for controlling light sources, method and display system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101176531B1 (en) * | 2005-05-31 | 2012-08-24 | 삼성전자주식회사 | Backligh system and liquid crystal display apparatus employing the same |
| US7948455B2 (en) * | 2005-10-20 | 2011-05-24 | 02Micro Inc. | Apparatus and method for regulating white LEDs |
| KR101201722B1 (en) * | 2010-02-23 | 2012-11-15 | 삼성디스플레이 주식회사 | Organic light emitting display and driving method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101197109A (en) * | 2007-04-19 | 2008-06-11 | 友达光电股份有限公司 | Current feedback and compensation circuit, led driving device and backlight system |
| CN101772237A (en) * | 2008-12-31 | 2010-07-07 | 凹凸电子（武汉）有限公司 | Circuit for controlling light sources, method and display system |
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