JP2005208486A - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
JP2005208486A
JP2005208486A JP2004017019A JP2004017019A JP2005208486A JP 2005208486 A JP2005208486 A JP 2005208486A JP 2004017019 A JP2004017019 A JP 2004017019A JP 2004017019 A JP2004017019 A JP 2004017019A JP 2005208486 A JP2005208486 A JP 2005208486A
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Japan
Prior art keywords
liquid crystal
light
plurality
crystal display
display device
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Pending
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JP2004017019A
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Japanese (ja)
Inventor
Yoshiaki Mizuhashi
Mitsuo Nakajima
Yasutaka Tsuru
満雄 中嶋
嘉章 水橋
康隆 都留
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Hitachi Ltd
株式会社日立製作所
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Priority to JP2004017019A priority Critical patent/JP2005208486A/en
Publication of JP2005208486A publication Critical patent/JP2005208486A/en
Application status is Pending legal-status Critical

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Abstract

【Task】
In the backlight of a liquid crystal display device, for example, when a part of the LED group is sequentially blinked, the luminance value and white balance are shifted during the period when the weakly emitting LED is turned on and off, and the desired luminance and luminance are visually uniform. And white balance cannot be obtained, and there is a problem that stable display cannot be performed.
[Solution]
A part of the plurality of LED groups of the backlight source is sequentially turned off, and the amount of light emitted from each LED group is controlled from the variation information of the amount of light detected by the photosensor unit.
[Selection] Figure 1

Description

  The present invention relates to a liquid crystal display device used for a television receiver or the like for receiving a video signal, and more particularly to a liquid crystal display device having an improved backlight.

  In recent years, the share of liquid crystal display devices has been expanding in the consumer television receiver market that mainly displays moving images, due to technological advances such as improved response time of liquid crystal panels and improved light transmittance. However, even in the present situation, in moving image display, tailing (afterimage) is detected in a moving part of the image, which causes a decrease in image quality, and improvement is desired.

  There are two major causes of this tailing, one is due to the response speed of the liquid crystal itself, and the other is due to the hold-type display.

  The hold-type display is a display method in which one field period is always displayed in the same state, and is detected as moving image blur combined with afterglow characteristics of human eyes. On the other hand, in a CRT, which has been the mainstream display means used in television receivers until now, a certain pixel in the screen is caused to emit light by electron beam irradiation within one field period, and after a phosphor afterglow period. No light is emitted afterwards. Such a display is called an impulse display, and no tailing occurs even in a moving image.

  Therefore, various techniques for bringing the display method of the liquid crystal display device closer to impulse display have been proposed at present. For example, the liquid crystal shutter is closed at least once in one field period to display the entire screen black, the backlight is turned off at least once in one field period to darken the entire screen, or both are used in combination. and so on.

  One method of turning off the backlight, which is to blink the entire screen all at once, is a noticeable decrease in brightness, and as a measure to improve it, turn off and turn on the backlight sequentially in part on the screen. However, no consideration is given to the uniformity of the amount of light emission within the light emitting surface of the backlight (see, for example, Patent Document 1).

  When the backlight is blinked as described above, it is advantageous to use an LED (Light Emitting Diode) as a backlight from the viewpoint of blinking response speed, reduction in backlight lifetime due to blinking, and the like. When an LED is used as a backlight, the variation in luminance due to temperature varies greatly from element to element. Therefore, the light emitted from the LED is monitored by a photosensor, and the light emission state (luminance, white balance) of the entire screen is targeted. Although a feedback control system has been proposed so that the light emission is uniform, the uniformity of the light emission amount within the light emission surface of the backlight is not considered (see, for example, Non-Patent Document 1).

JP 2000-275605 A

"FPD International 2003" Pre-Seminar Backlight Technology for Realizing the 3rd "Super Energy-Saving, High-Definition LCD TV" (April 24, 2003, sponsored by Nikkei Microdevices), 3.5 Optical Feedback System (pages 5-6)

  In the conventional system (see Non-Patent Document 1) in which the light emitted from the LED is monitored by a photo sensor and the light emission state of the entire screen is feedback-controlled so as to achieve the target light emission (see Non-Patent Document 1), the brightness of red R, green G, and blue B Is controlled on the basis of the entire screen.

  However, when the LED groups blink sequentially (see Patent Document 1), if there is a difference in light emission characteristics between the LED groups or between the LEDs in the LED group, the LEDs with relatively low light emission amounts are turned on or off. During this period, a decrease in luminance and a deviation in white balance (due to an imbalance among red R, green G, and blue B within the same LED group) occur, and visually desired luminance, luminance uniformity, and white Since a balance cannot be obtained and stable display cannot be realized, there is a problem that these must be solved.

  In view of the above problems, an object of the present invention is to divide a light emission region of a backlight light source into a plurality of divided regions, sequentially turn off the divided regions, and control the light emission amount for each divided region. Even if there are variations in the light emission characteristics between the light emitting elements constituting each divided area, the luminance value of the backlight, the luminance uniformity within the backlight emitting area, and the white balance of the backlight (within each divided area) The present invention provides a liquid crystal display device in which the stability of the R, G, and B light emission amounts is improved.

  The outline of typical inventions among inventions disclosed in this document will be described as follows.

  (1) A liquid crystal panel having a plurality of pixels arranged in a matrix, a liquid crystal driver for driving the liquid crystal panel, a backlight light source disposed on the back surface of the liquid crystal panel and irradiating the liquid crystal panel, and the backlight In a liquid crystal display device including a backlight control unit that performs dimming control of a light source and a photosensor unit that detects the amount of light emitted from the backlight source, the light emission region of the backlight source is divided into a plurality of divided regions. The light emitting area is turned on except for one divided area of the plurality of divided areas, and the one divided area is sequentially selected from the plurality of divided areas. The backlight control unit controls the light emission amount of each of the plurality of divided regions based on the output from the photosensor unit. A liquid crystal display device.

  (2) The liquid crystal display device according to (1), wherein the light emitting region of the backlight light source is divided into a plurality of divided regions in a field scanning direction of the liquid crystal panel. .

  (3) In the liquid crystal display device according to (1), each of the plurality of divided regions includes a light emitting diode that emits red light, a light emitting diode that emits green light, and a light emitting diode that emits blue light. Liquid crystal display device.

  (4) In the liquid crystal display device according to (1), the photosensor unit includes a red light receiving unit that detects red light, a green light receiving unit that detects green light, and a blue light receiving unit that detects blue light. A liquid crystal display device that is configured to detect red, green, and blue light amounts independently, and that only one is provided in the liquid crystal display device.

  (5) In the liquid crystal display device according to (1), the backlight control unit may be configured so that the backlight control unit includes the photosensor unit in each period during which one of the plurality of divided regions is turned off. And calculating the light emission amount of each of the plurality of divided regions based on the sampled value to control the light emission amount of each of the plurality of divided regions. Liquid crystal display device.

  (6) In the liquid crystal display device according to (1), an area of the liquid crystal panel facing the one divided area is a period during which the one divided area of the plurality of divided areas is turned off. A liquid crystal display device corresponding to a data writing time to the plurality of pixels existing in the display.

  (7) In the liquid crystal display device according to (1), the plurality of divided regions and the photosensor unit may include a plurality of light guide paths coupled to the plurality of divided regions and a plurality of light guide paths. A liquid crystal display device, wherein the liquid crystal display device is coupled via a light collector for collecting light output.

  By dividing the light emitting area of the backlight light source into a plurality of divided areas, sequentially turning off the divided areas, and controlling the light emission amount for each divided area, between the light emitting elements constituting each divided area. Even if there are variations in the light emission characteristics, the luminance value of the backlight, the luminance uniformity in the backlight emission region, and the white balance of the backlight (balance of R, G, B emission in each divided region) A liquid crystal display device with improved stability can be realized.

(Example 1)
Embodiments of the present invention will be described. FIG. 1 shows the configuration of an embodiment of the present invention. The liquid crystal display device according to this embodiment includes an LCD (Liquid Crystal Display) panel 109 having a plurality of pixels arranged in a matrix, an LCD driver 108 for driving the LCD panel 109, a backlight 100, and the backlight 100. The backlight control unit 106 and the photo sensor 107 are configured. The backlight 100 includes a plurality of LED groups that are turned on / off for each region divided in the vertical direction, that is, an LED group 101, an LED group 102, an LED group 103, and an LED group 104. Note that FIG. 1 illustrates the case where the image is divided into four areas, but it can be similarly divided into any number of areas.
The LCD driver 108 receives the video signal and the field synchronization signal and drives the LCD panel 109 to display an image. In response to the field synchronization signal, the backlight drive control unit 106 sequentially turns on and off the LED groups 101 to 104 in the backlight 100 divided into four in synchronization with the period of one field. Drive to do. The photo sensor 107 detects the light emission amount of the backlight 100 and feeds it back to the backlight drive control unit 106.

  Here, the writing timing to the LCD panel 109 and the sequential lighting / extinguishing timing of the backlight will be described. FIG. 2 shows the relationship between the writing position of the LCD panel 109 and the lighting / extinguishing of the LED group 101 to the LED group 104 in a time period within one field. In the period T1, the LCD panel 109 writes and updates the image data of the uppermost part, the backlight 100 turns off the LED group 101 corresponding to the writing part of the LCD panel 109, and the other LED groups 102 to 104. Lights up. In the period T2, the LCD panel 109 writes and updates the image data of the second part from the top, and the backlight 100 turns off the LED group 102 corresponding to the writing part of the LCD panel 109, and the other LED group 101 and LED group. 103, LED group 104 lights up. Similarly, in the period T3, the LCD panel 109 writes and updates the third part and turns off only the LED group 103, and in the period T4, the LCD panel 109 writes and updates the fourth part and turns off only the LED group 104. In this way, during the period in which writing on the LCD panel is performed and the occurrence of blurring is significant, the backlight of that portion is turned off so that the blurred image is not displayed.

  Next, backlight drive control will be described. FIG. 3 shows details of a control system including the backlight 100, the backlight drive control unit 106, and the photosensor 107 shown in FIG. The photosensor 107 includes a red light receiving unit 217 that detects red light, a green light receiving unit 218 that detects green light, and a blue light receiving unit 219 that detects blue light.

  Each of the LED group 201 to LED group 204 is an R (Red) light emitting LED R-LED, a G (Green) light emitting LED G-LED, or a B (Blue) light emitting LED B-LED. Consists of three color LEDs. LED group 201 R-color LED R-LED 201R, LED group 201 G-color LED G-LED 201G, LED group 201 B-color LED B-LED 201B, LED group 202 to LED group 204 Similarly, a symbol is added in FIG.

  In FIG. 3, it is assumed that each of the R color light emitting LEDs 201R to 204R, the G color light emitting LEDs 201G to 204G, and the B color light emitting LEDs 201B to 204B includes a required number of light emitting diodes.

  The backlight drive control unit 106 includes LED drive units 213 to 216, a timing control unit 220, and a gain control unit 221. The LED driving units 213 to 216 control to turn on / off the three color LEDs of the LED group 201 to the LED group 204, respectively. The timing control unit 220 generates a timing signal that defines the lighting / extinguishing timing of the LED driving units 213 to 216 and supplies the timing signal to the LED driving units 213 to 216.

  A timing signal generated by the timing controller 220 is shown in FIG. The uppermost part of FIG. 4 shows one frame period of a vertical synchronization signal that is a reference for timing control. TC1 to TC4 below the timing control signals of the LED group 201 to the LED group 204, respectively. When the timing control signals TC1 to TC4 are at a high level, the corresponding LED groups are turned on, and when the timing control signals TC1 to TC4 are at a low level, the corresponding LED groups are turned off. By sequentially shifting the low levels of the timing control signals TC1 to TC4 in time order as shown in FIG. 4, the LED groups of the backlight 100 described in FIG.

  Next, the gain control unit 221 controls the gain of the drive signal that defines the light emission amount of the LED when the LED drive units 213 to 216 drive the LED group 201 to the LED group 204, and controls the light emission amount of the LED. . The gain control unit 221 receives the R, G, and B emission amount detection signals from the photosensor 107 and the timing signal from the timing control unit 220, and emits the R, G, and B emission from the photosensor 107. The amount detection signal is sampled every time the timing signal from the timing control unit 220 is switched to generate a light emission amount detection signal for each period, and the above gain control is performed based on this information.

  Next, a control algorithm of the gain control unit 221 will be described. First, FIG. 5 shows the temporal transition of the value indicated by the R detection signal from the photosensor 107 when there is no variation in the light emission amounts of the LED group 201 to LED group 204.

  In the period T1, the sum RDET1 (= R2 + R3 + R4) of the light emission amount R2 of the LED 202R of the LED group 202, the light emission amount R3 of the LED 203R of the LED group 203, and the light emission amount R4 of the LED 204R of the LED group 204 shown in FIG. It is detected as an R detection signal of the sensor 107.

  In the period T2, the sum RDET2 (= R1 + R3 + R4) of the light emission amount R1 of the LED 201R of the LED group 201, the light emission amount R3 of the LED 203R of the LED group 203, and the light emission amount R4 of the LED 204R of the LED group 204 is detected.

  Similarly, RDET3 (= R1 + R2 + R4) is detected in the period T3, and RDET4 (= R1 + R2 + R3) is detected in the period T4.

When there is no variation in the light emission amount of the LED group 201 to LED group 204,
R1 = R2 = R3 = R4 = R (1)
And as shown in FIG.
RDET1 = RDET2 = RDET3 = RDET4 = 3 * R (2)
There is no temporal variation in the detected amount.

Next, FIG. 6 shows a case where the light emission amounts of the LED group 201 to LED group 204 vary. FIG. 6 shows a case where only the light emission amount R2 of the LED 202R is slightly smaller than the light emission amounts R1, R3, and R4.
R2 ′ = R2−Δr2 (Δr2> 0) (3)
This shows the case. At this time, RDET1 to RDET4 have the following relationship.

RDET1 = R2 ′ + R3 + R4 = 3 * R−Δr2 (4)
RDET2 = R1 + R3 + R4 = 3 * R (5)
RDET3 = R1 + R2 ′ + R4 = 3 * R−Δr2 (6)
RDET4 = R1 + R2 ′ + R3 = 3 * R−Δr2 (7)
The gain control unit 221 receives the sum of the light emission amounts from the photosensor 107, RDET1 to RDET4, and obtains a magnitude relationship between RDET1 to RDET4 and a difference value thereof.

For example,
RDET2> RDET1 = RDET3 = RDET4
RDET2-RDET1 = Δr2
RDET2-RDET3 = Δr2
RDET2-RDET4 = Δr2
If so, it can be detected that the light emission amount of the LED 202R of the LED group 202 is weak by Δr2.

  Based on the detection result, the gain control unit 221 gives a control signal that instructs the LED driving unit 214 that drives the LED group 202 to increase the light emission amount of the LED 202R by Δr2. Thereby, since the light emission amount of the LED 202R becomes R2, it is possible to maintain the relationship of the above expression (2).

  Although only the R signal has been described here, the G signal and the B signal are similarly controlled.

  The configuration of this embodiment is characterized in that only one photosensor is disposed. By doing so, there is an advantage that variations in characteristics among photosensors can be eliminated and the cost can be kept low.

In addition, the gain control unit 221 is preferably configured with a microcomputer in order to perform many arithmetic processes.
(Example 2)
Next, a second embodiment of the present invention will be described. FIG. 7 shows a configuration in the second embodiment. This configuration includes light guide paths 701 to 704 and 706 made of, for example, optical fibers, and a condenser 705 in addition to the configuration of FIG. The light guide path 701 guides light in the vicinity of the LED group 101 to the condenser 705. Similarly, the light guide paths 702 to 704 guide light in the vicinity of the LED group 102 to the LED group 104 to the condenser 705, respectively. The condenser 705 collects the light guided from the light guide paths 701 to 704 and guides it to the photosensor 107 through the light guide path 706. With this configuration, a light amount error due to a difference in distance between the photosensor 107 and the LED group 102 to the LED group 104 is reduced, and more accurate light amount detection can be performed. In addition, since there is almost no influence on the performance due to the arrangement position of the photosensor 107, there is an advantage that the degree of freedom of the arrangement position of the photosensor 107 is high.

The block diagram explaining the structure of one Example of this invention. The figure explaining operation | movement of the liquid crystal panel and backlight in one Example of this invention. The detailed block diagram of the backlight part in the 1st Example of this invention, and a backlight control part. The timing chart of the timing control signal in the 1st example of the present invention. The figure explaining the light quantity which the photo sensor detected. The figure explaining the light quantity which the photo sensor detected. The block diagram explaining the structure of the 2nd Example of this invention.

Explanation of symbols

100 ... Backlight,
101 ... LED group 1,
102 ... LED group 2,
103 ... LED group 3,
104 ... LED group 4,
106: Backlight drive control unit,
107: Photo sensor,
108: LCD driver,
109 ... LCD panel,
201R: R color light emitting LED of LED group 201,
201G: G color light emitting LED of LED group 201,
201B: B color light emitting LED of LED group 201,
202R ... R color light emitting LED of the LED group 202,
202G ... G color light emitting LED of the LED group 202,
202B: B color light emitting LED of LED group 202,
203R ... R color light emitting LED of LED group 203,
203G ... G color light emitting LED of LED group 203,
203B: B color light emitting LED of LED group 203,
204R ... R color light emitting LED of LED group 204,
204G ... G color light emitting LED of LED group 204,
204B ... B color light emitting LED of the LED group 204,
213 ... LED driving unit for driving the LED group 201,
214... LED driving unit that drives the LED group 202;
215... LED driving unit that drives the LED group 203;
216... LED driving unit that drives the LED group 204;
220 ... Timing control unit,
221: Gain control unit,
701-704 ... light guide,
705 ... Concentrator

Claims (7)

  1. A liquid crystal panel having a plurality of pixels arranged in a matrix;
    A liquid crystal driver that drives the liquid crystal panel;
    A backlight light source disposed on the back surface of the liquid crystal panel and illuminating the liquid crystal panel;
    A backlight control unit for dimming control of the backlight light source;
    In a liquid crystal display device comprising a photosensor unit that detects the amount of light emitted from the backlight light source,
    The light emission area of the backlight light source is divided into a plurality of divided areas, and the light emitting areas are turned on except for one divided area among the plurality of divided areas, and the one The divided areas are sequentially selected from the plurality of divided areas and turned off.
    The backlight control unit controls a light emission amount of each of the plurality of divided regions based on an output from the photosensor unit.
  2.   The liquid crystal display device according to claim 1, wherein the light emitting region of the backlight light source is divided into a plurality of divided regions in a field scanning direction of the liquid crystal panel.
  3.   2. The liquid crystal display device according to claim 1, wherein each of the plurality of divided regions includes a light emitting diode emitting red light, a light emitting diode emitting green light, and a light emitting diode emitting blue light.
  4.   The photo sensor unit includes a red light receiving unit that detects red light, a green light receiving unit that detects green light, and a blue light receiving unit that detects blue light, and independently controls the amounts of red, green, and blue light. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is to be detected, and only one is provided in the liquid crystal display device.
  5.   The backlight control unit samples the output from the photosensor unit in each period in which one of the plurality of divided regions is turned off, and based on the sampled value 2. The liquid crystal display device according to claim 1, wherein a light emission amount of each of the plurality of divided regions is calculated to control a light emission amount of each of the plurality of divided regions.
  6.   The period during which the one divided area of the plurality of divided areas is turned off corresponds to the time for writing data to the plurality of pixels existing in the area of the liquid crystal panel opposite to the one divided area. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device.
  7. The plurality of divided areas and the photosensor unit are coupled via a plurality of light guide paths coupled to the plurality of divided areas and a condenser that collects light output from the plurality of light guide paths. The liquid crystal display device according to claim 1.

JP2004017019A 2004-01-26 2004-01-26 Liquid crystal display Pending JP2005208486A (en)

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EP1750248A2 (en) 2005-08-05 2007-02-07 Samsung Electronics Co.,Ltd. Backlight unit, display apparatus comprising the same and control method thereof
JP2007066891A (en) * 2005-08-26 2007-03-15 Samsung Electronics Co Ltd Backlight unit and display device including the same, as well as, control method of the backlight unit
JP2007102136A (en) * 2005-10-07 2007-04-19 Sharp Corp Backlight device and display device equipped with the same
EP1777693A2 (en) 2005-10-18 2007-04-25 Sony Corporation A backlight and light source controlling method
JP2007214053A (en) * 2006-02-10 2007-08-23 Sharp Corp Light source module, light source system, and liquid crystal display device
JP2007226211A (en) * 2006-01-23 2007-09-06 Samsung Electronics Co Ltd Light generating module, liquid crystal display device having the same, and method of improving color reproducibility of display panel of display device
JP2008117713A (en) * 2006-11-07 2008-05-22 Sharp Corp Backlight device, and image display device
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US7507943B2 (en) 2006-10-19 2009-03-24 Sony Corporation Light source for LCD with individually controlled sections
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US7441935B2 (en) 2005-08-05 2008-10-28 Samsung Electronics Co., Ltd Backlight unit, display apparatus comprising the same and control method thereof
EP1750248A3 (en) * 2005-08-05 2007-09-26 Samsung Electronics Co.,Ltd. Backlight unit, display apparatus comprising the same and control method thereof
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JP2007066891A (en) * 2005-08-26 2007-03-15 Samsung Electronics Co Ltd Backlight unit and display device including the same, as well as, control method of the backlight unit
JP2007102136A (en) * 2005-10-07 2007-04-19 Sharp Corp Backlight device and display device equipped with the same
EP1777693A2 (en) 2005-10-18 2007-04-25 Sony Corporation A backlight and light source controlling method
JP4497140B2 (en) * 2005-10-18 2010-07-07 ソニー株式会社 Backlight, display device, and light source control method
US8085238B2 (en) 2005-10-18 2011-12-27 Sony Corporation Backlight, display apparatus and light source controlling method
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JP2007226211A (en) * 2006-01-23 2007-09-06 Samsung Electronics Co Ltd Light generating module, liquid crystal display device having the same, and method of improving color reproducibility of display panel of display device
JP2007214053A (en) * 2006-02-10 2007-08-23 Sharp Corp Light source module, light source system, and liquid crystal display device
US8035603B2 (en) 2006-05-30 2011-10-11 Sony Corporation Illumination system and liquid crystal display
KR101474006B1 (en) 2006-10-19 2014-12-17 소니 주식회사 Light source device, light source driving device, light emission amount control device and liquid crystal display
US7507943B2 (en) 2006-10-19 2009-03-24 Sony Corporation Light source for LCD with individually controlled sections
JP2008117713A (en) * 2006-11-07 2008-05-22 Sharp Corp Backlight device, and image display device
WO2008072160A1 (en) 2006-12-13 2008-06-19 Koninklijke Philips Electronics N.V. Method for light emitting diode control and corresponding light sensor array, backlight and liquid crystal display
JP2009003433A (en) * 2007-05-18 2009-01-08 Semiconductor Energy Lab Co Ltd Liquid crystal display device, electronic instrument and driving method thereof
US9360704B2 (en) 2007-05-18 2016-06-07 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device, electronic device, and driving methods thereof
KR101264720B1 (en) 2007-06-15 2013-05-15 엘지디스플레이 주식회사 Driving circuit for liquid crystal display device and method for driving the same
KR100855554B1 (en) * 2007-06-25 2008-09-02 삼성전자주식회사 Backlight unit and display device having the same
WO2009028033A1 (en) * 2007-08-27 2009-03-05 Pioneer Corporation Light source device
JP2009122651A (en) * 2007-10-24 2009-06-04 Sanyo Electric Co Ltd Lighting unit and projection display apparatus
JP2009162952A (en) * 2007-12-28 2009-07-23 Sony Corp Light emission control system and image display system
JP2009157385A (en) * 2009-01-26 2009-07-16 Sony Corp Light source device, light source driving device, emission amount control device, and liquid crystal display device
DE102009053911A1 (en) * 2009-11-19 2011-05-26 GM Global Technology Operations LLC, ( n. d. Ges. d. Staates Delaware ), Detroit Lighting device for illuminating a vehicle interior
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