WO2006019076A1 - 液晶表示用バックライト装置及び透過型液晶表示装置 - Google Patents
液晶表示用バックライト装置及び透過型液晶表示装置 Download PDFInfo
- Publication number
- WO2006019076A1 WO2006019076A1 PCT/JP2005/014915 JP2005014915W WO2006019076A1 WO 2006019076 A1 WO2006019076 A1 WO 2006019076A1 JP 2005014915 W JP2005014915 W JP 2005014915W WO 2006019076 A1 WO2006019076 A1 WO 2006019076A1
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- WIPO (PCT)
- Prior art keywords
- liquid crystal
- light
- crystal display
- backlight device
- emitting diode
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Definitions
- the present invention relates to a liquid crystal that illuminates a transmissive color liquid crystal display panel such as a transmissive color liquid crystal display (LCD) from the back side with display light emitted from a large number of light emitting diodes.
- a transmissive color liquid crystal display panel such as a transmissive color liquid crystal display (LCD)
- LCD transmissive color liquid crystal display
- the present invention relates to a display backlight device and a transmissive color liquid crystal display device using the backlight device for liquid crystal display.
- a liquid crystal display device has a larger display screen, lighter weight, thinner thickness, lower power consumption, and the like compared with a cathode ray tube (CRT: Cathode_Ray Tube).
- CRT Cathode_Ray Tube
- a self-luminous PDP P1 asma Display Panel
- liquid crystal is sealed between two transparent substrates of various sizes, and a voltage is applied between the transparent electrodes to change the direction of the liquid crystal molecules and change the light transmittance to display a predetermined image or the like. Display optically.
- a knock light unit that functions as a light source is provided on the back surface of the liquid crystal panel.
- the knock light unit includes, for example, a primary light source, a light guide plate, a reflective film, a lens sheet, or a diffusion plate, and supplies display light over the entire surface of the liquid crystal panel.
- the knocklight unit uses a cold cathode fluorescent lamp (CCLF: Cold Cathode Fluorescent Lamp) in which mercury or xenon is enclosed in a fluorescent tube as the primary light source.
- CCLF Cold Cathode Fluorescent Lamp
- the luminous intensity of the cold cathode fluorescent lamp is low! Life is short! Alternatively, it is necessary to solve problems such as a low luminance region on the cathode side and poor uniformity, etc.
- an area light that supplies a display light to a liquid crystal panel by arranging a plurality of long cold-cathode fluorescent lamps on the back of a diffuser plate is generally used.
- a type of area backlight device is provided. Even in such an area light type backlight device, it is necessary to solve the problems caused by the cold cathode fluorescent lamp described above, and particularly when applied to a large-sized television receiver exceeding 40 inches, it is possible to increase the brightness. The problem of high uniformity is becoming more prominent.
- the area light type backlight device in place of the cold cathode fluorescent lamp described above, a large number of three light primary red, green and blue light emitting diodes (hereinafter referred to as LED (Light Emitting)) are provided on the back side of the diffusion film.
- LED Light Emitting
- the LED area light type backlight that obtains white light by arranging two-dimensionally) is drawing attention.
- the cost is reduced along with the low cost of the LED, and high luminance display can be realized on a large liquid crystal panel with low power consumption.
- an optical function sheet block that diffuses and equalizes the function of display light emitted from a light source between a light source unit and a transmissive liquid crystal panel, and a diffusion light guide plate and a light diffusion plate
- various optical members such as reflective sheets are arranged
- the light diffusing plate used in the knocklight device is generally formed of light-transmitting acrylic resin or the like, and has a function of transmitting a part of the incident display light and reflecting a part thereof at a position facing the light source.
- a light diffusing plate is described in Japanese Patent Laid-Open No. 6-301034.
- the light diffusion plate described in this publication is provided with a strip-shaped dimming pattern composed of a number of reflective dots in a region facing the fluorescent tube. In this light diffusion plate, the reflective dots are formed so that the area decreases as the axial force of the fluorescent tube increases, so that the light transmittance increases as the distance from the fluorescent tube increases. To function.
- a side-emitting LED provided with an optical component that emits light emitted from a light source from the side, that is, a main component of emitted light is emitted in the outer peripheral direction of the light emitting bulb.
- a so-called side emission type LED having directivity is disclosed in Japanese Patent Application Laid-Open Nos. 2003-8068 and 2004-133391.
- a light diffusion plate is placed between a light-transmitting liquid crystal panel and a light source unit that is an array of light source blocks on which a large number of LEDs are mounted.
- a large number of dimming patterns can be formed to face each other.
- the display light is supplied to the liquid crystal panel with a uniform light intensity by controlling the transmission and reflection operations of the light diffusion plate for the display light emitted from the opposing LEDs. In this way, high brightness and high uniformity can be achieved.
- the current knocklight structure requires the use of a diffused light guide plate with a dot pattern with adjusted transmittance just above the LED.
- an LED backlight device a large amount of heat generated from a large number of LEDs acts on a light diffusing plate made of acrylic resin, causing a large dimensional change in the light diffusing plate. This may cause misalignment between the opposing LED and the dimming pattern. Also, in LED backlight devices, positional deviations between the LED and the dimming pattern occur due to variations in the dimensional accuracy and vertical accuracy of the liquid crystal panel, light source unit, or light diffusion plate, and the dimming pattern printing accuracy. There are things to do.
- LED backlight device In the LED backlight device, it was extremely difficult to precisely position the LED and the dimming pattern because of the various factors described above. In the LED backlight device, it was difficult to reduce costs because it was necessary to manufacture components with high precision and to perform precise assembly. In LED backlight devices, with the increase in size and brightness of liquid crystal display devices, the positional deviation between the LEDs and the dimming pattern has increased, and problems such as color unevenness and lamp images have become prominent on the liquid crystal panel. It becomes.
- the light source unit is a complex with multiple LEDs mounted. Since the area light type is configured by arranging a number of light source blocks at predetermined intervals, the display light emitted from each LED card toward the outer periphery is concentrated between the light source blocks. As a result, a phenomenon occurs in which a portion with high luminance occurs. In the LED backlight device, for this reason, a high-brightness area with horizontal stripes occurs in the area facing each row of each light source block of the light diffusion plate, and color irregularities of the horizontal stripes appear on the liquid crystal panel. was there.
- the LED backlight device for example, it is conceivable to form a dimming pattern with a large area on the light diffusion plate and to form it with milky white synthetic resin, but the display light is blocked and lighted. Since the transmittance is greatly reduced, the brightness of the liquid crystal panel is lowered. In LED backlight devices, for example, when using a larger number of LEDs to increase brightness, it is extremely difficult to respond to greater heat generation rather than force if the cost increases or power consumption increases. It becomes difficult.
- the object of the present invention is to solve the problems of the conventionally proposed or conceived technologies as described above, and to improve the brightness of a transmissive liquid crystal panel by providing a large number of light emitting diodes, as well as color.
- An object of the present invention is to provide a backlight device for liquid crystal display and a transparent liquid crystal display device in which the occurrence of unevenness and horizontal stripes is prevented.
- the present invention relates to a backlight device for a liquid crystal display that illuminates a transmissive color liquid crystal display panel with a rear side force, and an embodiment of the knock light device radiates light emitted from a light source from a side surface.
- a plurality of side emission light emitting diodes provided with the optical components to be arranged are arranged, and a light shielding portion is formed to cover at least the central portion of the front surface of the optical components provided in the side emission light emitting diodes.
- the present invention is a transmissive liquid crystal display device, and an embodiment of the display device is a side emission light emitting diode provided with an optical component that radiates light emitted from a light source cover from the side cover.
- a backlight unit for liquid crystal display in which a light-shielding portion is formed to cover at least the central part of the front surface of the optical component provided on the side-emitting diode, and the back surface by the backlight device for liquid crystal display. It is provided with a transmissive color liquid crystal display panel that is illuminated with side force.
- the apparatus can block the leakage light in the front direction of the side-emitting LED by the light shielding portion, and can reduce the occurrence of uneven color and horizontal stripes.
- the light-shielding portion that covers at least the central portion of the front surface of the optical component provided on the side-emitting LED is formed, a large number of light-emitting diodes that do not require a dimming pattern on the light diffusion plate
- the manufacturing cost and assembly of each component member are not affected by the dimensional change of each component member due to the heat generated from the heat, the dimensional accuracy or assembly accuracy of each component member, and the variation of the dimming pattern printing accuracy. Costs will be reduced.
- FIG. 1 is an exploded perspective view schematically showing a main part configuration of a color liquid crystal display device to which the present invention is applied.
- FIG. 2 is a schematic perspective view showing a schematic configuration of a backlight device for liquid crystal display provided in a color liquid crystal display device.
- FIG. 3 is a schematic diagram of a side-emitting diode that is equipped with optical components that radiate light emitted from a light source, which is used as a light-emitting diode that constitutes a backlight device for liquid crystal displays. It is typical sectional drawing which shows a partial structure.
- FIG. 4 is a cross-sectional view of the color liquid crystal display device shown in FIG. 1 taken along the line IV-IV.
- FIG. 5 is a block diagram showing a configuration of a drive circuit for driving a color liquid crystal display device.
- the present invention is applied to, for example, a transmissive color liquid crystal display device 100 configured as shown in FIG.
- the transmissive color liquid crystal display device 100 includes a transmissive color liquid crystal display panel 110 and a transmissive color liquid crystal display panel 110. And a liquid crystal display backlight device 140 provided on the back side of the liquid crystal display panel 110.
- the transmissive color liquid crystal display device 100 includes a receiving unit such as an analog tuner and a digital tuner that receives terrestrial and satellite waves, and a video signal processing that processes each of the video signal and the audio signal received by the receiving unit.
- An audio signal output unit such as a speaker that outputs an audio signal processed by the audio signal processing unit.
- the transmissive color liquid crystal display panel 110 two transparent substrates (TFT substrate 111, counter electrode substrate 112) made of glass or the like are arranged to face each other, and, for example, twisted nematic ( TN)
- the liquid crystal layer 113 enclosing the liquid crystal is provided.
- signal lines 114 arranged in a matrix, scanning lines 115, thin film transistors 116 as switching elements arranged at intersections of the signal lines 114 and the scanning lines 115, pixel electrodes 117, Is formed.
- the thin film transistor 116 is sequentially selected by the scanning line 115 and writes a video signal supplied from the signal line 114 corresponding to the pixel electrode 117.
- a counter electrode 118 and a color filter 119 are formed on the inner surface of the counter electrode substrate 112.
- the transmissive color liquid crystal display panel 110 having such a configuration is sandwiched between two polarizing plates 131 and 132, and the backlight device 140 for liquid crystal display emits white light from the back side. In this state, by driving with an active matrix method, a desired full-color image can be displayed.
- the backlight device for liquid crystal display 140 illuminates the color liquid crystal display panel 110 from the back side.
- the backlight device for liquid crystal display 140 is a backlight housing unit that incorporates a light source that is not shown here and a function that mixes emitted light into white light.
- 120 includes a diffusion plate 141, a diffusion sheet 142 disposed on the diffusion plate 141, a prism sheet 143, an optical sheet group 145 such as a polarization conversion sheet 144, and the like.
- the diffuser plate 141 uniformizes the luminance in surface light emission by internally diffusing the light emitted from the light source.
- FIG. 2 shows a schematic configuration inside the backlight casing 120.
- the knock light casing 120 has a red (R) light emitting diode 121R that emits red (R) light, a green (G) light emitting diode 121G that emits green light, and a blue light.
- RGB red
- G green
- B Blue
- Light emitting diode 121B is used as a light source.
- the red light emitting diode 121R, the green light emitting diode 121G, and the blue light emitting diode 121B are collectively referred to, they are simply referred to as the light emitting diode 121.
- the light emitting diodes 121 are arranged in a line in a desired order on the substrate 122 to form a light emitting diode unit 121 ⁇ (n is a natural number).
- the order of arranging the respective light emitting diodes 121 on the substrate 122 is as follows: green light emitting diode 121G, red light emitting diode 121R, green light emitting diode 121G, and blue light emitting diode 121B.
- the arrangement is such that four light emitting diodes 121 arranged in order are used as a repeating unit.
- the light emitting diode units 121 ⁇ are arranged in a plurality of rows in the knocklight casing 120 according to the size of the liquid crystal display panel 110 illuminated by the backlight device 140 for liquid crystal display.
- the arrangement of the light emitting diode unit 12 In in the backlight casing 120 may be arranged so that the longitudinal force of the light emitting diode unit 121 ⁇ is in the horizontal direction, as shown in FIG.
- the light emitting diode unit 121 ⁇ may be arranged so that the longitudinal direction thereof is the vertical direction, or the two may be combined.
- the method of arranging the light emitting diode unit 121 ⁇ so that the longitudinal direction is the horizontal direction or the vertical direction is the same as the method of arranging the multi-purpose fluorescent tubes used as the light source of the backlight device. Therefore, the accumulated design know-how can be used, and the cost and time required for manufacturing can be reduced.
- the light is mixed in the light casing 120 to be white light.
- each light emission is performed so that red (R) light, green (G) light, and blue (B) light emitted from each light-emitting diode 121 is uniformly mixed in the backlight casing 120.
- the diode 121 is provided with a lens, a prism, a reflecting mirror, etc., so as to obtain light having a wide directivity.
- each light-emitting diode 121 has a light-emitting bulb held by a resin holder and a pair of terminals protruding from a resin holder holder.
- Each light-emitting diode 121 has a side-emitting LED provided with an optical component 150 that emits light with both a light source power and a side force, that is, directivity for emitting the main component of the emitted light in the outer peripheral direction of the light-emitting bulb.
- the so-called side emission type LED is used.
- the optical component 150 provided in the light emitting diode 121 is provided with a light shielding portion 151 that covers at least the central portion of the front surface.
- the light shielding portion 151 is formed by applying a semi-transmissive paint or forming an optical reflecting film on a region covering at least the central portion of the conical reflecting surface in front of the optical component 150. The light leaking in the front direction is blocked.
- the light shielding portion 151 is formed so as to cover the entire conical reflection surface in the maximum state, but if it is formed so as to cover at least the central portion, the light leakage in the front direction can be shielded. I'll do it.
- a light guide plate 125 is provided so as to cover the light emitting diode unit 121 ⁇ which is a light source.
- the diffusion light guide plate 125 diffuses the light emitted from the light emitting diode 121 and the light reflected by the reflection sheet 126 described later.
- the diffusion plate 141 shown in FIG. 1 is a plate that diffuses milky white light having a predetermined thickness (for example, about 2 mm), and diffuses the light mixed with the diffusion light guide plate 125 to obtain white light with uniform luminance.
- the optical sheet group 145 raises the brightness by raising the white light in the normal direction of the diffuser plate 141.
- FIG. 4 shows a cross-sectional view taken along line IV-IV attached to the liquid crystal display device 100 shown in FIG. 1 when the liquid crystal display device 100 is assembled.
- the liquid crystal display panel 110 that constitutes the liquid crystal display device 100 includes spacers 103a and 103b by an external frame 101 and an internal frame 102, which are external casings of the liquid crystal display device 100. To pinch Retained.
- a guide member 104 is provided between the outer frame 101 and the inner frame 102, and the liquid crystal display panel 110 sandwiched between the outer frame 101 and the inner frame 102 is displaced in the longitudinal direction. Suppress it! /
- the liquid crystal display backlight device 140 constituting the liquid crystal display device 100 includes the light guide plate 141 on which the optical sheet group 145 is laminated and the diffusion light guide plate 125 as described above. Further, a reflection sheet 126 is disposed between the diffusion light guide plate 125 and the backlight casing 120. The reflection sheet 126 is disposed so that the reflection surface thereof faces the light incident surface 125a of the diffusing light guide plate 125 and is closer to the backlight housing 120 than the light emitting direction of the light emitting diode 121.
- the reflective sheet 126 is, for example, a silver-enhanced reflective film formed by sequentially laminating a silver reflective film, a low refractive index film, and a high refractive index film on a sheet base material.
- the reflection sheet 126 mainly emits light from the light emitting diode 121 and reflects the incident light reflected by the diffusion light guide plate 125.
- the diffusion plate 141, the diffusion light guide plate 125, and the reflection sheet 126 included in the liquid crystal display backlight device 140 are arranged so as to face each other, and are attached to the knock light casing 120.
- a plurality of optical states 105 are held in the knock light casing 120 of the liquid crystal display backlight device 140 while maintaining a distance from each other.
- the diffusing plate 141 is held by the bracket member 108 provided in the backlight casing 120.
- an optical component 150 that radiates light emitted from the light source, that is, the LED chip 121a, from the side surface is provided.
- the transmissive liquid crystal panel 110 is increased in luminance, and at the same time, the light shielding portion 15 covers at least the central portion of the front surface of the optical component 150 provided on the side emission light emitting diode 121. 1 is formed, the leakage light in the front direction of the side-emitting LED 121 can be blocked by the light blocking portion 151, and the occurrence of uneven color and horizontal stripes can be reduced.
- This liquid crystal display backlight In device 140 it is provided in side-emitting LED 121. Therefore, the light shielding part 151 covering at least the central part of the front surface of the optical component 150 is formed! Therefore, the heat generated from the multiple light emitting diodes 121 without the necessity of providing a dimming pattern on the diffusion light guide plate 125 It is possible to reduce the manufacturing cost and assembly cost of each structural member without being affected by variations such as the dimensional change of each structural member due to the influence of the dimensional accuracy, the dimensional accuracy or assembly accuracy of each structural member, and the printing accuracy of the dimming pattern. Become figured.
- the backlight device 140 for liquid crystal display since it is not necessary to provide a dimming pattern on the diffusion light guide plate 125 as described above, it is possible to adopt a configuration in which the diffusion light guide plate 125 is omitted.
- the color liquid crystal display device 100 is driven by, for example, a drive circuit 200 as shown in FIG.
- the drive circuit 200 is supplied from the power supply unit 210 that supplies drive power to the liquid crystal display panel 110 and the backlight device for liquid crystal display 140, the X driver circuit 220 and the Y driver circuit 230 that drive the liquid crystal display panel 110, and supplied from the outside.
- RGB process processing unit 250 which receives the received video signal and the video signal received by the receiving unit (not shown) included in the color liquid crystal display device 100 and processed by the video signal processing unit,
- An image memory 260 and a control unit 270 connected to the RGB process processing unit 250, a knock light drive control unit 280 for driving and controlling the backlight device 140 for liquid crystal display, and the like are provided.
- the video signal input via the input terminal 240 is subjected to signal processing such as chroma processing by the RGB process processing unit 250, and the composite signal power is also suitable for driving the liquid crystal display panel 110. It is converted into a separate signal and supplied to the control unit 270 and also supplied to the X driver 220 via the image memory 260.
- the control unit 270 controls the X driver circuit 220 and the Y driver circuit 230 at a predetermined timing according to the RGB separate signal, and uses the RGB separate signal supplied to the X driver circuit 220 via the image memory 260.
- the knock light drive control unit 280 generates a pulse width modulation (PWM) signal from the voltage supplied from the power supply 210 and drives each light emitting diode 121 that is a light source of the liquid crystal display backlight device 140.
- PWM pulse width modulation
- the color temperature of a light emitting diode has a characteristic that it depends on the operating current. Therefore, color reproduction is performed faithfully while obtaining the desired brightness. For example, it is necessary to drive the light emitting diode 121 using a pulse width modulation signal to suppress the color change.
- the user interface 300 is used for selecting a channel to be received by the receiving unit, adjusting an audio output amount to be output by an audio output unit (not shown), and illuminating the liquid crystal display panel 110 (not shown). This is an interface for adjusting the brightness of white light from the backlight device 140 and adjusting the white balance.
- the brightness control signal is transmitted to the backlight drive control unit 280 via the control unit 270 of the drive circuit 200.
- the backlight drive control unit 280 changes the duty ratio of the pulse width modulation signal for each of the red light emitting diode 121R, the green light emitting diode 121G, and the blue light emitting diode 121B to change the red light emitting diode 121R,
- the green light emitting diode 121G and the blue light emitting diode 121B are driven and controlled.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004238791A JP2006058483A (ja) | 2004-08-18 | 2004-08-18 | 液晶表示用バックライト装置及び透過型液晶表示装置 |
JP2004-238791 | 2004-08-18 |
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WO2006019076A1 true WO2006019076A1 (ja) | 2006-02-23 |
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PCT/JP2005/014915 WO2006019076A1 (ja) | 2004-08-18 | 2005-08-15 | 液晶表示用バックライト装置及び透過型液晶表示装置 |
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Cited By (1)
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WO2008145250A1 (de) * | 2007-05-31 | 2008-12-04 | Noctron Soparfi S.A. | Flüssigkristall-anzeigefeld |
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AU2007221590B2 (en) * | 2006-03-03 | 2012-08-30 | Mayekawa Mfg. Co., Ltd. | Novel bacteria and method for controlling plant disease using the same |
JP4733064B2 (ja) * | 2007-03-15 | 2011-07-27 | 株式会社ミツバ | 車両用ランプ |
KR20120138805A (ko) | 2010-03-12 | 2012-12-26 | 샤프 가부시키가이샤 | 발광 장치의 제조 방법, 발광 장치, 조명 장치, 백라이트, 액정 패널, 표시 장치, 표시 장치의 제조 방법, 표시 장치의 구동 방법 및 액정 표시 장치 |
KR101915816B1 (ko) * | 2011-01-04 | 2018-11-06 | 엘지전자 주식회사 | 디스플레이 장치 |
Citations (1)
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JP2001257381A (ja) * | 2000-03-13 | 2001-09-21 | Sharp Corp | 発光ダイオードおよびその製造方法並びに照明装置 |
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2004
- 2004-08-18 JP JP2004238791A patent/JP2006058483A/ja not_active Withdrawn
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JP2001257381A (ja) * | 2000-03-13 | 2001-09-21 | Sharp Corp | 発光ダイオードおよびその製造方法並びに照明装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008145250A1 (de) * | 2007-05-31 | 2008-12-04 | Noctron Soparfi S.A. | Flüssigkristall-anzeigefeld |
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JP2006058483A (ja) | 2006-03-02 |
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