WO2008023542A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

Info

Publication number
WO2008023542A1
WO2008023542A1 PCT/JP2007/064946 JP2007064946W WO2008023542A1 WO 2008023542 A1 WO2008023542 A1 WO 2008023542A1 JP 2007064946 W JP2007064946 W JP 2007064946W WO 2008023542 A1 WO2008023542 A1 WO 2008023542A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
liquid crystal
crystal display
illumination
light emitting
Prior art date
Application number
PCT/JP2007/064946
Other languages
English (en)
Japanese (ja)
Inventor
Takashi Yamazoe
Kazuyoshi Yamada
Yoshihiko Abe
Original Assignee
Nippon Seiki Co., Ltd.
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
Priority claimed from JP2006226768A external-priority patent/JP2007114743A/ja
Application filed by Nippon Seiki Co., Ltd. filed Critical Nippon Seiki Co., Ltd.
Publication of WO2008023542A1 publication Critical patent/WO2008023542A1/fr

Links

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
    • G02F1/133621—Illuminating devices providing coloured light
    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white

Definitions

  • the present invention relates to a liquid crystal display panel and a liquid crystal display device having a light emitting element such as a light emitting diode that illuminates the liquid crystal display panel.
  • Such a vehicle head-up display 1 projects display light L onto a transflective plate called a vehicle windshield or a complier to display a virtual image.
  • the vehicle head-up display 1 includes a liquid crystal display device 4 and a reflecting mirror 5 housed in a housing 3 having a translucent window portion 2.
  • the display light L emitted from the liquid crystal display device 4 is reflected. It is reflected by the mirror 5 and projected onto the windshield or complier (see Fig. 8).
  • the liquid crystal display device 4 includes a liquid crystal display panel 6 and light emitting diodes 7 and 8 that transmit and illuminate the liquid crystal display panel 6.
  • the light emitting diodes 7 and 8 emit light when supplied with a predetermined power from a drive circuit (not shown).
  • the light emitting diode 7 emits green light L1 and the light emitting diode 8 emits red light L2.
  • the liquid crystal display panel 6 is transmitted and illuminated with orange illumination light L3 in which green light L1 emitted from the light emitting diode 7 and red light L2 emitted from the light emitting diode 8 are mixed.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-295105
  • the illumination light L3 may have a slightly strong green color or a slightly strong red color at a desired chromaticity.
  • a color sensor that detects the chromaticity of the illumination light L3 is provided, and the voltage applied to the light emitting diodes 7 and 8 is adjusted in accordance with the chromaticity data output by the color sensor, so that the illumination light L3 chromaticity is always the desired chromaticity The power to make S is considered.
  • the color sensor is disposed between the light emitting diodes 7 and 8 and the liquid crystal display panel 6, the illumination light L3 may be blocked by the color sensor, and the liquid crystal display panel 6 may not be transmitted and illuminated uniformly.
  • the present invention provides a liquid crystal display device in which a liquid crystal display panel is uniformly transmitted and illuminated, and display light L has a desired chromaticity.
  • the present invention provides a liquid crystal display panel, illumination means for emitting illumination light for illuminating the liquid crystal display panel, detection means for detecting chromaticity of the illumination light, and detecting part of the illumination light. And a light guide member guided to the exit means.
  • the present invention also includes a liquid crystal display panel, a first light emitting element that emits first light having a first color, and a second light emitting element that emits second light having a second color.
  • Illumination means for illuminating the liquid crystal display panel with illumination light including the first light and the second light;
  • reflecting means for reflecting a part of the illumination light
  • detecting means for detecting chromaticity of a part of the illumination light reflected by the reflecting means
  • control means for adjusting electric power supplied to at least one of the first light emitting element and the second light emitting element.
  • the present invention is characterized in that the reflecting means comprises a light guide member having a reflecting surface for reflecting the illumination light.
  • the present invention is characterized in that the light guide member has a condensing part for condensing the illumination light reflected through the reflecting surface at a portion facing the detection means.
  • the illuminating means transmits the first light L1 emitted from the first light emitting element and reflects the second light emitted from the second light emitting element. It has a reflection member.
  • the present invention is characterized in that a circuit board on which the second light emitting element and the detection means are mounted is provided.
  • the liquid crystal display panel in which the detection means does not block the illumination light is uniformly illuminated.
  • FIG. 1 is a schematic view of a head-up display showing an embodiment of the present invention.
  • FIG. 2 is a sectional view showing the embodiment.
  • FIG. 3 is a side view of a liquid crystal display device showing the embodiment.
  • FIG. 4 is an explanatory diagram of a display area of the liquid crystal display panel showing the embodiment.
  • FIG. 5 is a block diagram showing the embodiment.
  • FIG. 6 is a side view of a liquid crystal display device showing another embodiment.
  • FIG. 7 is a side view of a liquid crystal display device showing another embodiment.
  • FIG. 8 is a cross-sectional view showing a conventional example.
  • the head-up display 11 is placed in the vehicle dashboard 12! /, (See Figure 1).
  • the display light L projected by the head-up display 11 is reflected by the windshield 13 to the observer 14.
  • the observer 14 can visually recognize the virtual image V superimposed on the landscape.
  • the head-up display 11 includes a liquid crystal display device 15, a reflector 16 and the like housed in a housing 17.
  • the liquid crystal display device 15 includes a liquid crystal display panel 18, an illuminator 19 (illumination means), a light guide member 27 (reflection means), and a color sensor 28 (detection means).
  • the liquid crystal display panel 18 is a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates on which a transparent electrode film is formed, and polarizing plates are attached to both front and rear surfaces, and the vehicle speed is digitally displayed. To do.
  • the illuminator 19 includes a light emitting diode 20 (first light emitting element), a light emitting diode 21 (second light emitting element), circuit boards 22 and 23, condenser lenses 24 and 25, and a dichroic mirror 26 (transmission). Reflection member).
  • the light emitting diode 20 emits green light L1 (first light), and the eight light emitting diodes 20 are mounted on the circuit board 22.
  • the light emitting diode 21 emits red light L2 (second light), and eight light emitting diodes 21 are mounted on the circuit board 23.
  • the condensing lenses 24 and 25 are made of a translucent resin such as polycarbonate, and are disposed to face the light emitting diode 20 and the light emitting diode 21, respectively.
  • the dichroic mirror 26 is inclined and transmits the green light L1 emitted from the light emitting diode 20.
  • the red light L2 emitted from the light emitting diode 21 is reflected.
  • the liquid crystal display panel 18 is transmitted and illuminated by the illumination light L3 in which the green light L1 and the red light L2 are mixed by the dichroic mirror 26.
  • the light guide member 27 is made of a translucent resin such as acrylic, and has a reflecting surface 27a that reflects a part L4 of the illumination light L3. As shown in FIG. 4, the light guide member 27 is arranged at a location where the illumination light L3 can enter from the illumination range S of the illumination light L3 and does not obstruct the display area 18a of the liquid crystal display panel 18. .
  • the color sensor 28 detects the chromaticity of part L4 of the illumination light L3 reflected by the reflecting surface 27a of the light guide member 27, and outputs chromaticity data to a microcomputer to be described later.
  • the reflector 16 includes a concave mirror 30, a holding member 31, and a stepping motor 32.
  • the concave mirror 30 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflective surface 30a.
  • the reflective surface 30a is a concave surface, and the display light L emitted from the liquid crystal display device 15 is enlarged to display the virtual image V.
  • the concave mirror 30 is bonded to the holding member 31 with a double-sided adhesive tape.
  • the holding member 31 is made of resin (for example, ABS), and the gear portion 34 and the shaft portion 35 are formed in a body.
  • the shaft portion 35 of the holding member 31 is pivotally supported by the housing 17.
  • a gear 37 is attached to the rotation shaft of the stepping motor 32, and the gear 37 is engaged with the gear portion 34 of the holding member 31.
  • the concave mirror 30 is supported in a rotatable state together with the holding member 31, and the projection mirror 32 can be rotated by the stepping motor 32 to adjust the projection direction of the display light L.
  • the observer 14 adjusts the angle of the concave mirror 30 by operating a push button switch (not shown) so that the display light is reflected at the position of the eye (that is, the virtual image V can be visually recognized).
  • the housing 17 accommodates a liquid crystal display device 15 and a reflector 16.
  • the housing 17 is provided with a window portion 44 through which the display light L is emitted.
  • the window 44 has a translucent resin (for example, acrylic) force and has a curved shape.
  • the housing 17 is provided with a light shielding wall 17c to prevent a phenomenon (washout) in which external light such as sunlight enters the liquid crystal display device 15 and the virtual image V becomes difficult to see.
  • the light shielding wall 17c has a flat plate shape and is formed so as to hang obliquely from the top of the housing 17! /.
  • FIG. 5 is a block diagram showing an electrical configuration of the liquid crystal display device 15.
  • a speed sensor 51 detects the speed of the vehicle and outputs speed data to the microcomputer 52.
  • the color sensor 28 outputs chromaticity data to the microcomputer 52.
  • the microcomputer 52 outputs a drive signal to the liquid crystal display panel 18 through the drive circuit 53 to display the vehicle speed on the liquid crystal display panel 18 and also transmits light to the light emitting diodes 20 and 21 through the drive circuits 54 and 55.
  • a drive signal is output, and the light emitting diodes 20, 21 are caused to emit light.
  • the control means 56 comprises a microcomputer 52 and drive circuits 54 and 55. Based on the chromaticity data output from the color sensor 28, the light emitting diode 20 is controlled so that the illumination light L3 has a desired chromaticity. , Adjust the drive voltage applied to 21.
  • the chromaticity of the display light L is set to a desired chromaticity by adjusting the power supplied to the light emitting diodes 20 and 21 based on the chromaticity data output from the color sensor 28. Furthermore, since the color sensor 28 does not block the illumination light L3, the liquid crystal display panel is uniformly transmitted and illuminated.
  • the present invention can be variously modified without being limited to the present embodiment.
  • the color sensor 28 and the light emitting diode 21 are connected to the same circuit board 63. May be installed.
  • the light guide member 27 is introduced into the light guide member 27 through the light incident portion 27b that receives a part L4 of the illumination light L3 and the light incident portion 27b.
  • the light output part 27c may be configured as a substantially convex lens-shaped condensing part having a spherical shape on the color sensor 28 side.
  • the liquid crystal display panel is uniformly transmitted and illuminated, and the illumination light L3 Part of the L4 force S is focused on the central part of the S color sensor 28, so that a sufficient amount of light can be guided to the color sensor 28, and the detection accuracy of the chromaticity detected by the color sensor can be improved.
  • the effect that it can be improved is obtained.
  • two types of light emitting diodes 20 and 21 having different emission colors are used. However, for example, three types of light emitting diodes having different emission colors may be used. Industrial applicability
  • the present invention is applicable to a head-up display that displays a virtual image by projecting display light emitted from a liquid crystal display panel onto a transflective plate called a vehicle windshield or combiner.

Landscapes

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

Abstract

Il est possible de mettre à disposition un dispositif d'affichage à cristaux liquides dans lequel un panneau d'affichage à cristaux liquides est éclairé de manière uniforme par transmittance et une lumière d'affichage a une chromaticité voulue. Un moyen d'éclairage (19) inclut un premier élément luminescent (20) pour émettre une première lumière (L1) ayant une première couleur et un second élément luminescent (21) pour émettre une seconde lumière (L2) ayant une seconde couleur. Une lumière d'éclairage (L3) contenant la première lumière (L1) et la seconde lumière (L2) est appliquée à un panneau d'affichage à cristaux liquides (18). Un élément conducteur de lumière (27) réfléchit une partie (L4) de la lumière d'éclairage (L3) de manière à ce qu'elle soit introduite dans un capteur de couleur (28). Le capteur de couleur (28) détecte la chromaticité d'une partie (L4) de la lumière d'éclairage (L3) réfléchie par l'élément conducteur de lumière (27) et transmet les données de chromaticité. Un moyen de commande ajuste l'énergie fournie à au moins un du premier élément luminescent (20) et du second élément luminescent (21) selon les données de chromaticité. La présente invention peut être appliquée à un affichage à tête haute pour projeter une lumière d'affichage émise à partir du panneau d'affichage à cristaux liquides vers un verre avant de véhicule (ou une plaque translucide appelée combineur) de manière à afficher une image virtuelle.
PCT/JP2007/064946 2006-08-23 2007-07-31 Dispositif d'affichage à cristaux liquides WO2008023542A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006226768A JP2007114743A (ja) 2005-09-20 2006-08-23 表示装置
JP2006-226768 2006-08-23

Publications (1)

Publication Number Publication Date
WO2008023542A1 true WO2008023542A1 (fr) 2008-02-28

Family

ID=39106632

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/064946 WO2008023542A1 (fr) 2006-08-23 2007-07-31 Dispositif d'affichage à cristaux liquides

Country Status (1)

Country Link
WO (1) WO2008023542A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020130028A1 (fr) * 2018-12-20 2020-06-25 Ｎｓウエスト株式会社 Dispositif d'affichage tête haute et casque

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286971A (ja) * 2003-03-20 2004-10-14 Mitsubishi Electric Corp 画像表示装置および画像表示方法
JP2005164710A (ja) * 2003-11-28 2005-06-23 Nec Mitsubishi Denki Visual Systems Kk 画像表示装置
JP2005331644A (ja) * 2004-05-19 2005-12-02 Mitsubishi Electric Corp 画像表示装置および画像表示方法
JP2006126705A (ja) * 2004-11-01 2006-05-18 Mitsubishi Electric Corp 画像表示装置
JP2006156324A (ja) * 2004-05-21 2006-06-15 Sharp Corp バックライトユニット及びそれを備えた液晶表示装置
JP2006267167A (ja) * 2005-03-22 2006-10-05 Sharp Corp 面照明装置及びそれを備えた液晶表示装置
JP2006278107A (ja) * 2005-03-29 2006-10-12 Sharp Corp 面照明装置及びそれを備えた液晶表示装置
JP2007141813A (ja) * 2005-10-18 2007-06-07 Sony Corp バックライト、表示装置及び光源制御方法
JP2007148177A (ja) * 2005-08-12 2007-06-14 Sharp Corp 光源制御装置、照明装置及び液晶表示装置
JP2007149402A (ja) * 2005-11-25 2007-06-14 Sharp Corp 照明装置及び液晶表示装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286971A (ja) * 2003-03-20 2004-10-14 Mitsubishi Electric Corp 画像表示装置および画像表示方法
JP2005164710A (ja) * 2003-11-28 2005-06-23 Nec Mitsubishi Denki Visual Systems Kk 画像表示装置
JP2005331644A (ja) * 2004-05-19 2005-12-02 Mitsubishi Electric Corp 画像表示装置および画像表示方法
JP2006156324A (ja) * 2004-05-21 2006-06-15 Sharp Corp バックライトユニット及びそれを備えた液晶表示装置
JP2006126705A (ja) * 2004-11-01 2006-05-18 Mitsubishi Electric Corp 画像表示装置
JP2006267167A (ja) * 2005-03-22 2006-10-05 Sharp Corp 面照明装置及びそれを備えた液晶表示装置
JP2006278107A (ja) * 2005-03-29 2006-10-12 Sharp Corp 面照明装置及びそれを備えた液晶表示装置
JP2007148177A (ja) * 2005-08-12 2007-06-14 Sharp Corp 光源制御装置、照明装置及び液晶表示装置
JP2007141813A (ja) * 2005-10-18 2007-06-07 Sony Corp バックライト、表示装置及び光源制御方法
JP2007149402A (ja) * 2005-11-25 2007-06-14 Sharp Corp 照明装置及び液晶表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020130028A1 (fr) * 2018-12-20 2020-06-25 Ｎｓウエスト株式会社 Dispositif d'affichage tête haute et casque

Similar Documents

Publication Publication Date Title
EP2769867B1 (fr) Appareil d'affichage tête haute pour un véhicule
JP5532683B2 (ja) 液晶表示装置
JP2005331624A (ja) 車両用ヘッドアップディスプレイ装置
JP4164077B2 (ja) 光源ユニット及び光源ユニットを用いたディスプレイユニット
WO2017017946A1 (fr) Dispositif de miroir électronique
JP2007114743A (ja) 表示装置
JP6070982B2 (ja) 表示装置
JP2006011168A (ja) 車両用ヘッドアップディスプレイ装置
JP2012106702A (ja) 車両用表示装置
JP2011112654A (ja) 表示装置
WO2008023542A1 (fr) Dispositif d'affichage à cristaux liquides
JP5283325B2 (ja) 発光装置
JP2004317906A (ja) 表示装置
JP2011112754A (ja) 表示装置
JP2014041315A (ja) 表示装置
JP2003131162A (ja) 表示装置
JP2011033712A (ja) 液晶表示装置
JP2009080321A (ja) 表示装置、偏光制御方法
JP2003025871A (ja) 投射型表示装置
JP2008261901A (ja) 液晶表示装置
JP3718741B2 (ja) 表示装置
JP2004228887A (ja) 車両用表示装置
JP2009157298A (ja) 液晶表示装置
WO2004046799A1 (fr) Affichage pour vehicule
JP2008262039A (ja) 発光装置

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU