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WO2012032979A1 - Dispositif d'éclairage et dispositif d'affichage - Google Patents

Dispositif d'éclairage et dispositif d'affichage Download PDF

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Publication number
WO2012032979A1
WO2012032979A1 PCT/JP2011/069721 JP2011069721W WO2012032979A1 WO 2012032979 A1 WO2012032979 A1 WO 2012032979A1 JP 2011069721 W JP2011069721 W JP 2011069721W WO 2012032979 A1 WO2012032979 A1 WO 2012032979A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
light
led
lighting device
liquid crystal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/069721
Other languages
English (en)
Japanese (ja)
Inventor
真之助 野澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of WO2012032979A1 publication Critical patent/WO2012032979A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Definitions

  • the present invention relates to a lighting device and a display device including the lighting device.
  • the direct type backlight unit has a configuration in which, for example, a plurality of LEDs (Light Emitting Diodes) serving as a light source are arranged below the diffusion plate. And it is comprised so that the light from several LED may be spread
  • LEDs Light Emitting Diodes
  • the present invention has been made to solve the above-described problems, and one object of the present invention is to provide an illumination device capable of further increasing contrast and a display device equipped with the illumination device. Is to provide.
  • the brightness of the lighting area can be sufficiently secured by adding the light from the second light source to the light from the first light source. For this reason, it is possible to suppress a decrease in contrast due to insufficient brightness of the lighting area.
  • the illumination device further includes a rotation member that includes a shaft portion extending in parallel to the bottom portion and rotates about the shaft portion as a fulcrum, and the second light source is provided on the rotation member. Therefore, it is preferable that the irradiation direction is variable. If comprised in this way, the irradiation direction of light can be made variable easily, and the light from a 2nd light source can be easily irradiated to the area
  • the bottom portion is formed in a substantially rectangular shape in plan view, and the plurality of second light sources are arranged in the vicinity of each side of the bottom portion.
  • the area is irradiated with light from the second light source arranged near each side. , It can shine with higher brightness.
  • a display device includes the illumination device according to the first aspect and a display panel that receives light from the illumination device. If comprised in this way, the display panel which can display a further high contrast image
  • the liquid crystal display device 100 includes a liquid crystal display panel 10, a backlight unit 50 that supplies light to the liquid crystal display panel 10, and the liquid crystal display panel 10 and the backlight unit. 50 is provided with a bezel 70 as a housing that covers the liquid crystal display panel 10 from the display surface side.
  • the liquid crystal display device 100 is an example of the “display device” in the present invention
  • the liquid crystal display panel 10 is an example of the “display panel” in the present invention.
  • the backlight unit 50 is an example of the “lighting device” in the present invention.
  • the liquid crystal display panel 10 configured in this manner displays an image by using a change in transmittance caused by the tilt of liquid crystal molecules.
  • the backlight chassis 30 is a substantially box-shaped member opened on the liquid crystal display panel 10 side, and includes a bottom portion 30a and a side portion 30b provided on the outer periphery of the bottom portion 30a.
  • the backlight chassis 30 is formed, for example, by processing a metal plate-like member, and accommodates them by spreading the LED modules 20 on the bottom surface 30c.
  • the region surrounded by the side portion 30 b of the backlight chassis 30 has a substantially rectangular shape (substantially rectangular shape), and the substantially rectangular region is a housing region that houses the LED module 20.
  • the backlight chassis 30 since the backlight chassis 30 is formed in a substantially rectangular shape, the backlight chassis 30 has a pair of long sides 31 and a pair of short sides 32 in plan view.
  • the backlight chassis 30 is an example of the “base” in the present invention.
  • the LED module 20 that constitutes the backlight unit 50 is a module that emits light. As shown in FIGS. 2 and 3, the mounting board 21 and the LEDs mounted on the mounting surface 21 a of the mounting board 21 (first 1 light source) 22.
  • the mounting substrate 21 is a plate-like and rectangular substrate, and a plurality of electrodes (not shown) are arranged on the mounting surface 21a. And said LED22 is attached on these electrodes.
  • the LED 22 is mounted on an electrode (not shown) formed on the mounting surface 21a of the mounting substrate 21 so as to receive light and emit light. Further, as shown in FIG. 1, a plurality of LEDs 22 as light sources are mounted in the accommodation area of the backlight chassis 30.
  • Each of the plurality of LEDs 22 is composed of a white LED (white light emitting diode), and is two-dimensionally arranged in the accommodation area of the backlight chassis 30 (on the bottom 30a of the backlight chassis 30).
  • the plurality of LEDs 22 are arranged in a grid in the row direction (X direction) and the column direction (Y direction).
  • a plurality of end light sources (second light sources) 120 are further provided on the end side of the bottom 30 a of the backlight chassis 30.
  • the end light source 120 is configured to emit light obliquely upward, and its emission direction is variable.
  • the rotating member 130 includes a shaft portion 131 serving as a rotating shaft and a plate-like mounting portion 132 on which the end light source 120 is mounted. Further, the shaft portion 131 of the rotating member 130 is provided so as to extend in parallel with the bottom portion 30a (bottom surface 30c) of the backlight chassis 30, and the mounting portion 132 of the rotating member 130 has a shaft direction in the width direction. The shaft 131 is attached so as to substantially coincide with the extending direction of 131. Thereby, as shown in FIG. 4, the rotating member 130 is configured to be rotatable in the A direction with the shaft portion 131 as a fulcrum.
  • the end light source 120 is composed of, for example, a highly directional white LED 120 a and is mounted on the mounting portion 132 of the rotating member 130.
  • the end light source 120 is preferably mounted such that the emission direction thereof substantially coincides with the normal direction of the mounting portion 132.
  • a lens member 120 b that collects light such as a concave lens is provided on the emission direction side of the end light source 120. That is, the end light source 120 includes a lens member 120b for increasing the directivity of light.
  • the directivity of the end light source 120 is preferably configured to be stronger than the directivity of the LED 22.
  • the rotation member 130 is connected to an angle adjustment mechanism 140 (see FIG. 5) such as a stepping motor, for example, and a rotation angle (an angle with respect to the bottom surface 30c) by a driving force from the angle adjustment mechanism 140. Is adjusted. Then, by adjusting the rotation angle of the rotation member 130, the emission direction of light emitted obliquely upward from the end light source 120 is changed. That is, the irradiation position of the end light source 120 is changed by adjusting the rotation angle of the rotation member 130.
  • an angle adjustment mechanism 140 see FIG. 5
  • a rotation angle an angle with respect to the bottom surface 30c
  • the angle adjusting mechanism 140 is connected to each of the plurality of rotating members 130 (end light sources 120), and the plurality of rotating members 130 (end light sources 120) are independently controlled. It is configured to be possible.
  • the end light source 120 (the rotating member 130) is arranged in a region near each side of the bottom 30a of the backlight chassis 30 so as to surround the plurality of LEDs 22.
  • a plurality of end light sources 120 are arranged along the long side 31 and the short side 32 of the bottom 30a.
  • the plurality of end light sources 120 are arranged to correspond to the columns and the rows of the plurality of LEDs 22. That is, the end light sources 120 are arranged on the extended lines of the respective rows and columns of the LEDs 22 arranged in a grid pattern.
  • the plurality of end light sources 120 arranged along the long side direction (X direction) emit light in a direction along the column direction (Y direction) of the LEDs 22 when viewed in plan.
  • each of the plurality of end light sources 120 arranged along the short side direction (Y direction) emits light in a direction along the row direction (X direction) of the LEDs 22 when viewed in plan. Has been placed.
  • the backlight unit 50 is provided with a reflection sheet (not shown).
  • This reflection sheet has a function of reflecting light from the LED module 20 (LED 22) and increasing light traveling toward the liquid crystal display panel 10 side.
  • the diffusion plate 45 is an optical sheet that overlaps the LED module 20, and diffuses light emitted from the LED module 20 (LED 22). That is, the diffusion plate 45 diffuses the light from the LEDs 22 and spreads the light over the entire area of the liquid crystal display panel 10.
  • the lens sheet 47 is an optical sheet that overlaps the prism sheet 46.
  • fine particles that refract and scatter light are dispersed in the lens sheet 47, and the light from the prism sheet 46 is not collected locally, and the difference in brightness (light intensity unevenness) is suppressed.
  • the liquid crystal display device 100 equipped with the backlight unit 50 has a color correction for a tuner 160 that receives a television broadcast via an antenna 210 and a video signal (image signal) input from the tuner 160.
  • An image signal processing unit 170 that performs image processing such as tone correction, gradation correction, and noise removal, and a liquid crystal display panel control unit that controls display of images on the liquid crystal display panel 10 based on signals from the image signal processing unit 170 180.
  • the image signal processing unit 170 is also connected to the light source control unit 150, and a signal from the image signal processing unit 170 is input to the light source control unit 150.
  • the brightness of each area of the backlight unit 50 is adjusted in synchronization with the brightness of each area of the video (display image).
  • the light from the plurality of LEDs 22 (LED modules 20) is superposed to form planar light, and the planar light is passed through the plurality of optical members 45 to 47.
  • the non-light-emitting liquid crystal display panel 10 receives the light (backlight light) from the backlight unit 50 and improves the display function.
  • the LEDs 22 arranged in the area are largely arranged. It is necessary to pass current. However, since a current exceeding the rating cannot flow through one LED 22, for example, when the number of LEDs 22 is small, there is a problem that it is difficult to ensure sufficient brightness of the lighting area. Further, when a large current is passed through the LED 2, there is a problem that the temperature of the LED 22 rises and the light emission efficiency is lowered.
  • the brightness of the lighting area can be sufficiently secured by adding the light from the end light source 120 to the light from the LED 22. For this reason, it is possible to suppress a decrease in contrast due to insufficient brightness of the lighting area. In addition, since the brightness of the lighting area can be sufficiently ensured without causing a large current to flow through the LED 22, it is possible to suppress the temperature increase of the LED 22.
  • the emission direction of the end light source 120 can be easily made variable. Thereby, it is possible to easily irradiate the light from the end light source 120 to the area corresponding to the bright area of the video.
  • the plurality of LEDs 22 are arranged two-dimensionally in the row direction and the column direction, and the end light source 120 is backlit so as to correspond to each column and each row of the plurality of LEDs 22.
  • the light from the end light source 120 can be irradiated to the region corresponding to the irradiation region of the LED 22. .
  • the rotation member 130 is moved to a desired position (a position where light from the end light source 120 is irradiated to a desired region when the end light source 120 is turned on). It is possible to wait in advance. Then, by turning on the end light source 120 in synchronization with the display of the display image, the bright area of the image can be illuminated with higher luminance. Thereby, the edge part light source 120 (rotating member 130) can be controlled effectively so that it may synchronize with the display of a display image.
  • a plurality of end light sources 120 provided in the vicinity of each side of the backlight chassis 30 are configured to rotate integrally with each other.
  • the mounting part 132 of the rotating member 130 is formed in an elongated shape so as to extend along each side of the backlight chassis 30, and a plurality of end light sources 120 are provided on the mounting part 132. Implemented at intervals. For this reason, the plurality of end light sources 120 mounted on the mounting portion 132 are configured to rotate integrally as the rotating member 130 rotates.
  • the number of mounting stepping motors or the like can be reduced. For this reason, the number of parts can be reduced, and the angle adjustment mechanism 140 (see FIG. 5) can be simplified.
  • FIG. 7 is a plan view schematically showing a part of a backlight unit according to a first modification of the second embodiment.
  • FIG. 8 is a perspective view schematically showing an end light source of a backlight unit according to a first modification of the second embodiment.
  • the shaft portion 131 of the rotating member 130 is provided in the first modification of the second embodiment. It is in a connected state. That is, in the first modification, unlike the second embodiment, the mounting portions 132 of the rotating member 130 are individually separated, and a plurality of individually separated mounting portions 132 are provided as one piece. It is connected by a shaft part 131. For this reason, as in the second embodiment, the plurality of end light sources 120 mounted on the mounting portion 132 are configured to rotate integrally as the rotating member 130 rotates.
  • FIG. 9 is a plan view schematically showing a part of a backlight unit according to a second modification of the second embodiment.
  • the end light source is provided with the lens member.
  • the present invention is not limited to this.
  • the directivity of the light source is strong.
  • the lens member may not be provided.
  • the rotation angle of the rotation member may be controlled using an angle adjustment mechanism other than the motor.
  • the rotation angle of the rotation member may be controlled using an angle adjustment mechanism including a piezoelectric actuator (piezoelectric element).
  • the angle adjusting mechanism may be a mechanism that can give displacement to the rotating member (angle control is possible).
  • the edge part light source showed the example arrange
  • the arrangement of the end light sources may be an arrangement that does not correspond to each column and each row of LEDs.
  • Liquid crystal display panel (display panel) DESCRIPTION OF SYMBOLS 11 Active matrix board
  • LED module 21 Mounting board 22

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un dispositif d'éclairage grâce auquel il est possible d'obtenir un contraste plus élevé. Une unité de rétro-éclairage (dispositif d'éclairage) (50) comprend : un châssis de rétro-éclairage (30) qui comprend une partie de base (30a) ; des LED (22) qui sont disposées sur la partie de base (30a) du châssis de rétro-éclairage (30) ; et des sources de lumière d'extrémité (120), qui sont disposées autour des LED (22) et font varier la direction d'irradiation.
PCT/JP2011/069721 2010-09-06 2011-08-31 Dispositif d'éclairage et dispositif d'affichage Ceased WO2012032979A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010198779 2010-09-06
JP2010-198779 2010-09-06

Publications (1)

Publication Number Publication Date
WO2012032979A1 true WO2012032979A1 (fr) 2012-03-15

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PCT/JP2011/069721 Ceased WO2012032979A1 (fr) 2010-09-06 2011-08-31 Dispositif d'éclairage et dispositif d'affichage

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WO (1) WO2012032979A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014007093A (ja) * 2012-06-26 2014-01-16 Sharp Corp 光源装置およびそれを備えた投光装置
JP2014072187A (ja) * 2012-09-28 2014-04-21 Boe Technology Group Co Ltd バックライトモジュール及び液晶表示装置
JP2014085676A (ja) * 2012-10-24 2014-05-12 Samsung Electronics Co Ltd 曲面ディスプレイ装置
EP3407126A1 (fr) * 2017-05-22 2018-11-28 Funai Electric Co., Ltd. Dispositif d'affichage à cristaux liquides et dispositif de source lumineuse
CN116819829A (zh) * 2023-08-30 2023-09-29 惠科股份有限公司 背光模组和显示设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003330111A (ja) * 2002-05-10 2003-11-19 Olympus Optical Co Ltd 発光ユニット、照明装置、及び投影表示装置
JP2006339047A (ja) * 2005-06-02 2006-12-14 Sony Corp バックライト装置及びこれを備えた液晶表示装置
JP2007059378A (ja) * 2005-07-25 2007-03-08 Toyoda Gosei Co Ltd 光源装置
JP2008147182A (ja) * 2006-12-05 2008-06-26 Ind Technol Res Inst 光の出射角度を調整可能な発光装置
JP2009158193A (ja) * 2007-12-25 2009-07-16 Sony Corp バックライト装置及び液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003330111A (ja) * 2002-05-10 2003-11-19 Olympus Optical Co Ltd 発光ユニット、照明装置、及び投影表示装置
JP2006339047A (ja) * 2005-06-02 2006-12-14 Sony Corp バックライト装置及びこれを備えた液晶表示装置
JP2007059378A (ja) * 2005-07-25 2007-03-08 Toyoda Gosei Co Ltd 光源装置
JP2008147182A (ja) * 2006-12-05 2008-06-26 Ind Technol Res Inst 光の出射角度を調整可能な発光装置
JP2009158193A (ja) * 2007-12-25 2009-07-16 Sony Corp バックライト装置及び液晶表示装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014007093A (ja) * 2012-06-26 2014-01-16 Sharp Corp 光源装置およびそれを備えた投光装置
JP2014072187A (ja) * 2012-09-28 2014-04-21 Boe Technology Group Co Ltd バックライトモジュール及び液晶表示装置
JP2014085676A (ja) * 2012-10-24 2014-05-12 Samsung Electronics Co Ltd 曲面ディスプレイ装置
EP3407126A1 (fr) * 2017-05-22 2018-11-28 Funai Electric Co., Ltd. Dispositif d'affichage à cristaux liquides et dispositif de source lumineuse
CN108931868A (zh) * 2017-05-22 2018-12-04 船井电机株式会社 液晶显示装置和光源装置
JP2018194786A (ja) * 2017-05-22 2018-12-06 船井電機株式会社 液晶表示装置および光源装置
US10948771B2 (en) 2017-05-22 2021-03-16 Funai Electric Co., Ltd. Liquid-crystal display device and light-source device
CN116819829A (zh) * 2023-08-30 2023-09-29 惠科股份有限公司 背光模组和显示设备

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