CN101430456B - Backlight unit and LCD device using the same - Google Patents
Backlight unit and LCD device using the same Download PDFInfo
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- CN101430456B CN101430456B CN2007101651692A CN200710165169A CN101430456B CN 101430456 B CN101430456 B CN 101430456B CN 2007101651692 A CN2007101651692 A CN 2007101651692A CN 200710165169 A CN200710165169 A CN 200710165169A CN 101430456 B CN101430456 B CN 101430456B
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Abstract
The invention discloses a backlight unit and an LCD apparatus using the unit. The invention simplifies a circuit structure so as to generate white lights and obtain expected white lights by improving the white balancing. The backlight unit comprises a luminescence unit which generates the white lights by using red, green and blue LED arrays; a power supply unit which provides drive current for the red, green and blue LED arrays; and a current balancing unit which maintains the white balancing by controlling the current flowing into the red, green and blue LED arrays. According to the backlight unit and the LCD apparatus using the unit, the current of the red, green and blue LED arrays can be balanced by the current balancing unit, thereby generating the white lights with expected white points by maintaining the white balancing. Meanwhile, the red, green and blue LED arrays are driven by one power source and one controller by the current balancing unit, thereby simplifying a circuit structure.
Description
The korean patent application No.10-2006-087848 that the application submitted based on September 12nd, 2006 is incorporated herein its full content as a reference.
Background technology
The LCD device that embodiments of the present invention relate to a kind of back light unit and use this back light unit, more particularly, embodiments of the present invention relate to a kind of circuit structure of can simplifying and improve the back light unit that white balance obtains the white light of expection to produce white light and to pass through, and a kind of LCD device that uses above-mentioned back light unit.
Summary of the invention
In general, liquid crystal display (LCD) device is made up of LCD panel and back light unit, wherein the LCD panel comprises a plurality of liquid crystal cells that are arranged in matrix structure and a plurality ofly is used to change the gauge tap that provides to the vision signal of each liquid crystal cells, and back light unit is to this LCD panel emission light.The LCD device shows the image of expection on display screen by control optical transmission ratio.
Back light unit has microminiaturization, slim body and lightweight trend.In order to comply with this trend of back light unit, light emitting diode (LED) is owing to having replaced fluorescent light in the advantage aspect energy consumption, weight and the brightness.
Fig. 1 shows the synoptic diagram of the back light unit that uses the prior art light emitting diode.
With reference to Fig. 1, the prior art back light unit is made up of luminescence unit 10 and power circuit 20, and wherein luminescence unit 10 uses redness, green and blue LED (LED) to send white light, and power circuit 20 drives these luminescence units 10.
This luminescence unit 10 is made up of first led array 121, second led array 122 and the 3rd led array 123, wherein first led array 121 comprises the red LED (RLED1 is to RLEDn) that a plurality of polyphones connect, second led array 122 comprises the green LED (GLED1 is to GLEDn) that a plurality of polyphones connect, and the 3rd led array 123 comprises the blue led (BLED1 is to BLEDn) that a plurality of polyphones connect.
This power circuit 20 comprises first to the 3rd power supply 221,222 and 223, and it produces electric current to drive first to the 3rd led array 121,122 and 123 respectively.
The supply voltage (Vin) that first power supply 221 is imported from the outside based on the control signal and the use of the first controller (not shown) produces first drive current (ir) to drive first led array 121.
The supply voltage (Vin) that second source 222 is imported from the outside based on the control signal and the use of the second controller (not shown) produces second drive current (ig) to drive second led array 122.
The supply voltage (Vin) that the 3rd power supply 223 is imported from the outside based on the control signal and the use of the 3rd controller (not shown) produces the 3rd drive current (ib) to drive the 3rd led array 123.
Described a plurality of red LED (RLED1 is to RLEDn) is connected in series between the lead-out terminal and earthing power supply of first power supply 221, thereby drive described a plurality of red LED (RLED1 is to RLEDn) by first drive current (ir) that provides by first power supply 221, to produce ruddiness.
Described a plurality of green LED (GLED1 is to GLEDn) is connected in series between the lead-out terminal and earthing power supply of second source 222, thereby drive described a plurality of green LED (GLED1 is to GLEDn) by second drive current (ig) that provides by second source 222, to produce green glow.
Described a plurality of blue led (BLED1 is to BLEDn) is connected in series between the lead-out terminal and earthing potential of the 3rd power supply 223, thereby drive described a plurality of blue leds (BLED1 is to BLEDn) by the 3rd drive current (ib) that provides by the 3rd power supply 223, to produce blue light.
The prior art back light unit is by mixing the ruddiness that produced by red LED (RLED1 is to RLEDn), producing white light by the green glow of green LED (GLED1 is to GLEDn) generation and by the blue light of blue led (BLED1 is to BLEDn) generation.
For the luminescence unit 10 that comprises first to the 3rd led array 121,122 and 123 by driving produces white light, the prior art back light unit comprises 221,222 and 223 and three controllers of three power supplys, thereby causes circuit structure complexity and cost to increase.
And first to the 3rd led array 121,122 and 123 is driven by other power supplys 221,222 and 223 respectively, so can not obtain white light owing to keep the complicacy of white balance.
Summary of the invention
Therefore, the LCD device that embodiments of the present invention relate to a kind of back light unit and use this back light unit, it can overcome basically owing to the defective of prior art and not enough one or more problems of bringing.
The purpose of embodiment of the present invention is the LCD device that a kind of back light unit is provided and uses this back light unit, and it simplifies circuit structure to produce white light and by improving the white light that white balance obtains to expect.
Other advantage of the present invention, purpose and a feature part will be illustrated in following instructions, and a part will become apparent when studying hereinafter for those of ordinary skill in the art or understands by implementing the present invention.Purpose of the present invention and other advantage can be realized and acquisition by the structure that particularly points out in written instructions and claims and accompanying drawing.
In order to realize these purposes and other advantage, and according to purpose of the present invention, as concrete and generalized description ground, a kind of back light unit comprises: luminescence unit, and it is by using redness, green and blue LED arrays generation white light; Power supply unit is for redness, green and blue LED arrays provide drive current; And the current balance unit, the electric current that flows in redness, green and the blue LED arrays by control keeps white balance.
On the other hand, a kind of LCD device comprises: image-display units, and it is provided with the liquid crystal cells that forms in the zone by many grid lines and many data line qualifications; Drive circuit unit is used for showing the image corresponding to the input data on image-display units; And back light unit, being used for to described image-display units emission light, wherein said back light unit comprises: luminescence unit, to produce white light by use redness, green and blue LED arrays; Power supply unit is for redness, green and blue LED arrays provide drive current; And the current balance unit, be used for keeping white balance by the electric current of control inflow redness, green and blue LED arrays.
Should be appreciated that above concise and to the point description and the following detailed description of the present invention all are exemplary and indicative, and be intended to provide of the present invention further explanation claimed.
Description of drawings
Accompanying drawing provides further understanding of the present invention, and it is included in the instructions and constitutes the part of instructions, and it shows embodiments of the present invention and is used from explanation principle of the present invention with instructions one.In the accompanying drawings:
Fig. 1 shows the synoptic diagram of the back light unit that uses the prior art light emitting diode;
Fig. 2 shows the synoptic diagram of back light unit according to the preferred embodiment of the present invention;
Fig. 3 shows the synoptic diagram according to the current balance unit of first embodiment of the invention;
Fig. 4 shows the synoptic diagram according to the current balance unit of second embodiment of the invention;
Fig. 5 shows the synoptic diagram according to the current balance unit of third embodiment of the invention;
Fig. 6 shows the synoptic diagram of LCD device according to the preferred embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present invention is elaborated.In institute's drawings attached, will use identical Reference numeral to represent identical or similar parts as much as possible.
Describe with reference to the accompanying drawings according to back light unit of the present invention and the LCD device that uses this unit.
Fig. 2 shows the synoptic diagram of back light unit according to the preferred embodiment of the present invention.
With reference to Fig. 2, back light unit comprises according to the preferred embodiment of the present invention: luminescence unit 110, and it sends white light by using redness, green and blue LED (LED) array 1121,1122 and 1123; The power supply unit 120 of drive current is provided for redness, green and blue LED arrays 1121,1122 and 1123; Keep the current balance unit 130 of white balance by the electric current of controlling in each redness, green and blue LED arrays 1121,1122 and 1123; And based on the control module 140 of controlling power supply unit 120 by the feedback signal of current balance unit 130 outputs.
Equilibrium is used for the electric current of each led array 1121,1122 and 1123 to back light unit by using current balance unit 130 according to the preferred embodiment of the present invention, thereby produces the white light of the white point with expectation by the white balance that keeps luminescence unit 110.
Back light unit can be simplified circuit structure by using current balance unit 130 according to the preferred embodiment of the present invention, and it only has a power supply unit 120 and a control module 140 to drive redness, green and blue LED arrays 1121,1122 and 1123.
Fig. 3 shows the schematic circuit according to the current balance unit 130 of first embodiment of the invention.
With reference to Fig. 3 and in conjunction with Fig. 2, current balance unit 130 according to first embodiment of the invention is controlled by the electric current (ir) of red LED array 1121, and wherein current balance unit 130 comprises first to the 3rd mirrored transistor M1, M2 and the M3 that connects in the current mirror mode.Each first to the 3rd mirrored transistor forms by bipolar transistor.
At this moment, the base stage of the first mirrored transistor M1 and collector are connected to an end of red LED array 1121 jointly by first resistance R 1; And the emitter of the first mirrored transistor M1 is connected to earthing power supply by second resistance R 2.
Subsequently, the base stage of the second mirrored transistor M2 is connected to the base stage of the first mirrored transistor M1; The collector of the second mirrored transistor M2 is connected to an end of green LED array 1122; And the emitter of the second mirrored transistor M2 is connected to earthing power supply by second resistance R 2.
Simultaneously, the base stage of the 3rd mirrored transistor M3 is connected to the base stage of the first mirrored transistor M1; The collector of the 3rd mirrored transistor M3 is connected to an end of blue LED arrays 1123; And the emitter of the 3rd mirrored transistor M3 is connected to earthing power supply by second resistance R 2.
Usually, the transistorized electric current that connects with the current mirror form is subjected to the influence of transistorized current amplification degree (β), as the following formula shown in 1:
[formula 1]
Transistorized current amplification degree (β) can be represented by following formula 2:
[formula 2]
In formula 2, ' Dn ' is the electrons spread rate of base stage; ' Dp ' is the hole diffusivity of emitter; ' N
D' be the doping density of emitter; ' N
A' be the doping density of base stage; ' Lp ' is the hole diffusion length of emitter; ' W ' is the width of effective base stage; And ' τ
b' be the minority carrier lifetime on the base stage.
In above-mentioned formula 1 and formula 2, by first to the 3rd mirrored transistor M1, the current deviation that M2 and M3 flow into each led array 1121,1122 and 1123 mainly is subjected to current amplification degree (β 1, β 2, β 3) and doping density (N
A/ N
D) influence.
Therefore, current balance unit 130 is by using current amplification degree (β 1, and β 2, and β 3) and the doping density (N of first to the 3rd mirrored transistor M1, M2 and M3
A/ N
D) and keep white balance for led array 1121,1122 and 1123.
For example, in order to remain on the white balance of the white light that produces in the luminescence unit 110, if the green drive current (ig) of the red drive current (ir) of red LED array 1121, green LED array 1122 and the blue drive current (ib) of blue LED arrays 11 23 occur with 1: 2: 2 ratio, each mirrored transistor M1 then, the base width of M2 and M3 also occurs with 1: 2: 2 ratio, thereby the current amplification degree (β 1, β 2, β 3) of mirrored transistor M1, M2 and M3 is set to 1: 2: 2.Therefore, has identical doping density (N at hypothesis mirrored transistor M1, M2 with M3
A/ N
D) situation under, the current amplification degree (β 1, β 2, β 3) that current balance unit 130 is provided with each mirrored transistor M1, M2 and M3 to be keeping the white balance of expection, thereby each mirrored transistor M1 is set, the M2 and the M3 magnitude of current are to keep white balance.
The current amplification degree (β 1, β 2, β 3) of each mirrored transistor M1, M2 and M3 can be set by experiment.The current amplification degree of first mirrored transistor (M1) (β 1) is less than the current amplification degree (β 2, β 3) of the second and the 3rd mirrored transistor M2 and M3.Simultaneously, the current amplification degree (β 3) of the current amplification degree of the second mirrored transistor M2 (β 2) and the 3rd mirrored transistor M3 is identical or less than the current amplification degree (β 3) of the 3rd mirrored transistor M3.
Fig. 4 shows the schematic circuit according to the current balance unit 130 of second embodiment of the invention.
With reference to Fig. 4 and in conjunction with Fig. 2, current balance unit 130 according to second embodiment of the invention is controlled by the electric current (ir) of red LED array 1121, and wherein current balance unit 130 is made up of first to the 3rd mirror transistor Q1, the Q2 and the Q3 that connect with the current mirror form.Each of first to the 3rd mirrored transistor Q1, Q2, Q3 forms by field effect transistor.
At this moment, the grid of the first mirrored transistor Q1 is connected with an end of red LED array 1121 by resistance R jointly with source electrode; And the drain electrode of the first mirrored transistor Q1 is connected with earthing power supply.
Subsequently, the grid of the second mirrored transistor Q2 is connected with the grid of the first mirrored transistor Q1; The source electrode of the second mirrored transistor Q2 is connected with an end of green LED array 1121; And the drain electrode of the second mirrored transistor Q2 is connected with earthing power supply.
And the grid of the 3rd mirrored transistor Q3 is connected with the grid of the first mirrored transistor Q1; The source electrode of the 3rd mirrored transistor Q3 is connected with an end of blue LED arrays 1123; And the drain electrode of the 3rd mirrored transistor Q3 is connected with earthing power supply.
The electric current (ir, ig, ib) that flows into each led array 1121,1122 and 1123 is controlled by using first to the 3rd mirrored transistor Q1, Q2 and Q3 in current balance unit 130, and the balanced electric current of each led array 1121,1122 and 1123 that flows into is to keep white balance.
Channel width (W) and the white balance of length (L) to keep expecting of first to the 3rd mirrored transistor Q1, Q2 and Q3 are set for this reason, by experiment.The channel width of the first mirrored transistor Q1 (W) and length (L) are less than channel width (W) and the length (L) of the second and the 3rd mirror transistor Q2 and Q3.Simultaneously, the channel width (W) of the channel width of the second mirrored transistor Q2 (W) and length (L) and the 3rd mirrored transistor Q3 is identical with length (L) or less than channel width (W) and the length (L) of the 3rd mirror transistor Q3.
Fig. 5 shows the schematic circuit according to the current balance unit 130 of third embodiment of the invention.
With reference to Fig. 5, current balance unit 130 according to third embodiment of the invention comprises magnetic device, it is connected with 1123 with red, green and blue LED arrays 1121,1122, and compensation is red, the impedance deviation of green and blue LED arrays 1121,1122 and 1123.
This magnetic device is coupling inductance or multi-path transformer.This magnetic device is by being connected respectively to redness, green and blue LED arrays 1121,1122 and 1123 and be connected to first of earthing power supply by resistance R simultaneously and form to tertiary coil L1, L2 and L3.
First can have identical turn ratio or different turn ratios to tertiary coil L1, L2 and L3, thereby compensation is red, the impedance deviation of green and blue LED arrays 1121,1122 and 1123 and keep the white balance of expection.
Compensate the impedance deviation of redness, green and blue LED arrays 1121,1122 and 1123 according to the current balance unit 130 of third embodiment of the invention, and pass through to use first to the 3rd turn ratio L1, L2 and L3 to keep the white balance of expecting.
Fig. 6 shows the synoptic diagram of LCD device according to the preferred embodiment of the present invention.
With reference to Fig. 6, the LCD device comprises image-display units 300, drive circuit unit 310 and back light unit 320 according to the preferred embodiment of the present invention, and wherein image-display units 300 is provided with the liquid crystal cells that forms in the zone that is limited by many grid lines (GL1 to GLn) and many data lines (DL1 to DLm); Drive circuit unit 310 shows the image corresponding to input data (data) on image-display units 300; And back light unit 320 is to image-display units 300 emission light.
Image-display units 300 comprises a plurality of thin film transistor (TFT)s that are formed in the zone that is limited by ' n ' bar grid line (GL1 to GLn) and ' m ' bar data line (DL1 to DLm); And the liquid crystal cells that is connected with thin film transistor (TFT) TFT respectively.
Thin film transistor (TFT) TFT offers liquid crystal cells in response to the grid forward voltage of grid line (GL1 to GLn) with the vision signal of data line (DL1 to DLm).Liquid crystal cells comprises the pixel electrode that is connected to public electrode respect to one another and thin film transistor (TFT), and is inserted with liquid crystal at public electrode and thin film transistor (TFT) between the two, thus this liquid crystal cells by equivalently represented be liquid crystal capacitance (Clc).Simultaneously, liquid crystal cells comprises memory capacitance (Cst), and its maintenance charges into the vision signal in liquid crystal capacitance (Clc), till charging into next vision signal.
Drive circuit unit 310 comprises: gate driver 312, and it produces the grid forward voltage and this grid forward voltage is offered grid line (GLl to GLn) in turn based on grid-control system signal (GCS); Data driver 3 14, it will be imported data (data) according to data controlling signal (DCS) and be converted to vision signal, and with the synchronous mode of grid forward voltage (gate on voltages) vision signal is offered corresponding data line (DL1 to DLm); And time schedule controller 316, it provides adjusted input data (data) to data driver 314, and control gate driver 312 and data driver 314.
Simultaneously, time schedule controller 316 produces the driving sequential of grid-control system signal (GCS) with control gate driver 312 by using from the synchronizing signal of outside input, and produce the driving sequential of data controlling signal (DCS) with control data driver 314, described synchronizing signal from the outside input be Dot Clock (DCLK), data enable signal (DE) and level and vertical synchronizing signal (Hsync and Vsync) at least one of them.
Back light unit 320 produces white light by green light of mixing the red light that produced by at least one red LED, being produced by at least one green LED and the blue light that is produced by at least one blue led, and the white light that produces is offered image-display units 300.
For this reason, back light unit 320 have with Fig. 2 in the identical structure of back light unit according to the preferred embodiment of the present invention.Simultaneously, back light unit 320 can comprise the arbitrary current balance unit to the 3rd embodiment according to first shown in Fig. 3 to Fig. 5.Can back light unit 320 be described by Fig. 2 to Fig. 5.
The LCD device is controlled the projection ratio of the light that is sent by back light unit 320 according to the vision signal that provides from image-display units according to the preferred embodiment of the present invention, and shows the image of expection on image-display units 300.
For LCD device according to the preferred embodiment of the present invention, use the white light that has a white balance of expectation by the current balance unit to show the image of expection, thereby improved picture quality.
As mentioned above, the LCD device of back light unit and this unit of use has the following advantages according to the preferred embodiment of the present invention.
For back light unit according to the present invention and the LCD device that uses this unit, can be red, green and blue LED arrays euqalizing current by the current balance unit, thereby by keeping white balance to form having the white light of expection white point.
Simultaneously, use the current balance unit, redness, green and blue LED arrays drive by a power supply and a controller, thereby have simplified circuit structure.
Obviously, under the situation that does not break away from the spirit and scope of the present invention, those of ordinary skill in the art can make various modifications and variations to the present invention.Therefore, the invention is intended to cover improvement and modification within all scopes that fall into claims and equivalent thereof.
Claims (15)
1. back light unit comprises:
Luminescence unit, by using redness, green and blue LED arrays produces white light;
Power supply unit is for redness, green and blue LED arrays provide drive current;
The current balance unit, the electric current that flows into redness, green and blue LED arrays by control keeps white balance; And
Control module is used for controlling described power supply unit by the current feedback that flows into earthing power supply from the current balance unit;
Wherein, described current balance unit is by from red, green and the blue LED arrays Current Control of one of them arbitrarily, and described current balance unit is made up of first to the 3rd mirrored transistor that connects with the current mirror form.
2. back light unit according to claim 1 is characterized in that, described first to the 3rd mirrored transistor is formed by bipolar transistor.
3. back light unit according to claim 2 is characterized in that, described first to the 3rd mirrored transistor has identical current amplification degree or different current amplification degrees.
4. back light unit according to claim 2, it is characterized in that the current amplification degree of first mirrored transistor that is connected with described red LED array is less than the current amplification degree of second mirrored transistor that is connected with described green LED array and the current amplification degree of the 3rd mirrored transistor that is connected with described blue LED arrays; And the current amplification degree of the current amplification degree of described second mirrored transistor and described the 3rd mirrored transistor is identical or less than the transistorized current amplification degree of the 3rd mirror.
5. back light unit according to claim 1 is characterized in that, described first to the 3rd mirrored transistor is formed by field effect transistor.
6. back light unit according to claim 5 is characterized in that, described first to the 3rd mirrored transistor has identical channel width and length or different channel width and length.
7. back light unit according to claim 5, it is characterized in that the channel width of first mirrored transistor that is connected with described red LED array and length are less than the channel width and the length of the channel width of second mirrored transistor that is connected with described green LED array and length and the 3rd mirrored transistor that is connected with described blue LED arrays; And the channel width of the channel width of described second mirrored transistor and length and described the 3rd mirrored transistor and length is identical or less than the channel width and the length of the 3rd mirrored transistor.
8. liquid crystal display device comprises:
Image-display units, it has the liquid crystal cells that is formed in the zone that is limited by many grid lines and many data lines;
Drive circuit unit is used for showing the image corresponding to the input data on described image-display units; And
Back light unit is used for to described image-display units emission light,
Wherein, described back light unit comprises:
Luminescence unit produces white light by using redness, green and blue LED arrays;
Power supply unit is for described redness, green and blue LED arrays provide drive current; And
The current balance unit, the electric current that flows into described redness, green and blue LED arrays by control keeps white balance; And
Control module is used for controlling described power supply unit by the current feedback that flows into earthing power supply from the current balance unit,
Wherein, described current balance unit is by from red, green and the blue LED arrays Current Control of one of them arbitrarily, and described current balance unit is made up of first to the 3rd mirrored transistor that connects with the current mirror form.
9. liquid crystal display device according to claim 8 is characterized in that, described drive circuit unit comprises:
Gate driver, it drives described grid line in proper order;
Data driver, it is converted to vision signal with described input data, and provides described vision signal to described data line;
Time schedule controller, it provides described input data to described data driver, and controls described gate driver and data driver.
10. liquid crystal display device according to claim 8 is characterized in that, described first to the 3rd mirrored transistor is formed by bipolar transistor.
11. liquid crystal display device according to claim 10 is characterized in that, described first to the 3rd mirrored transistor has identical current amplification degree or different current amplification degrees.
12. liquid crystal display device according to claim 10, it is characterized in that the current amplification degree of first mirrored transistor that is connected with described red LED array is less than the current amplification degree of the current amplification degree of second mirrored transistor that is connected with described green LED array and the 3rd mirrored transistor that is connected with described blue LED arrays; And the current amplification degree of the current amplification degree of described second mirrored transistor and described the 3rd mirrored transistor is identical or less than the current amplification degree of the 3rd mirrored transistor.
13. liquid crystal display device according to claim 8 is characterized in that, described first to the 3rd mirrored transistor is formed by field effect transistor.
14. liquid crystal display device according to claim 13 is characterized in that, described first to the 3rd mirrored transistor has identical channel width and length or different channel width and length.
15. liquid crystal display device according to claim 13, it is characterized in that the channel width of first mirrored transistor that is connected with described red LED array and length are less than the channel width and the length of the channel width of second mirrored transistor that is connected with described green LED array and length and the 3rd mirrored transistor that is connected with described blue LED arrays; And the channel width of the channel width of described second mirrored transistor and length and described the 3rd mirrored transistor and length is identical or less than the channel width and the length of the 3rd mirrored transistor.
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| CN2007101651692A CN101430456B (en) | 2007-11-05 | 2007-11-05 | Backlight unit and LCD device using the same |
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| CN2007101651692A CN101430456B (en) | 2007-11-05 | 2007-11-05 | Backlight unit and LCD device using the same |
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| CN101430456B true CN101430456B (en) | 2011-11-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110408A (en) * | 2009-12-23 | 2011-06-29 | 大青大师们有限公司 | Energy-saving light emitting diode display panel system |
| CN102779486A (en) * | 2012-08-03 | 2012-11-14 | 福建捷联电子有限公司 | LED (Light-Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
| CN103634976A (en) * | 2012-08-29 | 2014-03-12 | 深圳富泰宏精密工业有限公司 | Backlight module control circuit |
| CN103354081B (en) | 2013-07-11 | 2016-04-20 | 京东方科技集团股份有限公司 | Pixel driving current extraction element and pixel driving current extracting method |
| CN103796380B (en) * | 2013-12-25 | 2016-08-17 | 深圳市华星光电技术有限公司 | Liquid crystal indicator and backlight thereof and light-dimming method |
| TWI652664B (en) | 2018-04-11 | 2019-03-01 | 點晶科技股份有限公司 | Light-emitting diode display system and image detecting method |
| KR102598383B1 (en) * | 2018-12-10 | 2023-11-06 | 엘지디스플레이 주식회사 | Display device and signal inversion device |
| CN111833822B (en) * | 2020-04-17 | 2021-10-22 | 北京奕斯伟计算技术有限公司 | Backlight source, backlight module, backlight driving method and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492263A (en) * | 2002-09-26 | 2004-04-28 | 京瓷株式会社 | Semi transmission type colour liquid crystal display device |
| CN1804697A (en) * | 2004-12-03 | 2006-07-19 | 矽感成像有限公司 | Back light system of panel type LCD |
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2007
- 2007-11-05 CN CN2007101651692A patent/CN101430456B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492263A (en) * | 2002-09-26 | 2004-04-28 | 京瓷株式会社 | Semi transmission type colour liquid crystal display device |
| CN1804697A (en) * | 2004-12-03 | 2006-07-19 | 矽感成像有限公司 | Back light system of panel type LCD |
Non-Patent Citations (1)
| Title |
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| JP平1-179913A 1989.07.18 |
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