JPH06167935A - Image display device - Google Patents

Image display device

Info

Publication number
JPH06167935A
JPH06167935A JP32054492A JP32054492A JPH06167935A JP H06167935 A JPH06167935 A JP H06167935A JP 32054492 A JP32054492 A JP 32054492A JP 32054492 A JP32054492 A JP 32054492A JP H06167935 A JPH06167935 A JP H06167935A
Authority
JP
Japan
Prior art keywords
panel
refraction
liquid crystal
display panel
display device
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.)
Pending
Application number
JP32054492A
Other languages
Japanese (ja)
Inventor
Ryoji Wakamoto
良治 若本
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.)
Denso Corp
Original Assignee
NipponDenso 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
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to JP32054492A priority Critical patent/JPH06167935A/en
Publication of JPH06167935A publication Critical patent/JPH06167935A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00Illuminated signs; Luminous advertising
    • G09F13/20Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent

Landscapes

  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

PURPOSE:To provide the image display device which is improved in the visibility form the direction diagonal with the main plane of the image display device of a liquid crystal type or LED type. CONSTITUTION:A microprism part 41 consisting of wedge-shaped straight grooves parallel with each other is inscribed on the main plane of a refraction panel 4 disposed on the front surface of a display panel 5 of the liquid crystal type or the LED type and, therefore, the incident image light perpendicularly on the main plane of the refraction panel 4 from the display panel 5 is refracted at a specified equal angle in this microprism part 41 and is emitted in the direction diagonal with the main plane. The visibility of the display panel 5 of the liquid crystal type or the LED type is good only within the narrow angle range around the direction perpendicular to the main plane and, therefore, the best visibility angle range is shifted in a diagonal direction according to refraction. The contrast in the case of viewing of the display panel from a diagonal direction is improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は液晶式又はLED式の画
像表示装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal type or LED type image display device.

【0002】[0002]

【従来の技術】従来、車両用の画像表示装置は、視認性
を向上するために太陽光などの室外光が運転者に入射し
ないように、また、運転者の反射像が視野外となるよう
に、運転者の視線方向に対してその主面を傾設してい
る。
2. Description of the Related Art Conventionally, an image display device for a vehicle is designed so that outdoor light such as sunlight does not enter the driver in order to improve visibility, and the reflected image of the driver is out of the visual field. In addition, its main surface is inclined with respect to the driver's line of sight.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記し
た車両用の画像表示装置として液晶式(又はLED式
の)表示パネルを用いた場合、図5に示すように液晶パ
ネル9はその主面に対して斜め方向からの視認性が良く
ないので、コントラストなどの画像品質が著しく低下す
るという不具合が生じた。
However, when a liquid crystal type (or LED type) display panel is used as the above-mentioned image display device for a vehicle, the liquid crystal panel 9 is arranged on the main surface as shown in FIG. Since the visibility from the oblique direction is not good, the image quality such as contrast is significantly deteriorated.

【0004】本発明は上記問題点に鑑み得られたもので
あり、液晶式又はLED式の画像表示装置においてその
主面に対し斜め方向からの視認性の向上を実現した画像
表示装置を提供することをその目的としている。
The present invention has been made in view of the above problems, and provides an image display device which realizes an improvement in visibility from a diagonal direction with respect to the main surface of a liquid crystal or LED type image display device. That is the purpose.

【0005】[0005]

【課題を解決するための手段】本発明の画像表示装置
は、液晶式又はLED式の表示パネルと、主面に刻設さ
れた互いに平行な楔状直線溝からなるプリズム部を有す
るとともに前記表示パネルの前面に配設され平行入射画
像光を一定等角度で屈折する屈折パネルとを備えること
を特徴としている。
An image display device according to the present invention has a liquid crystal type or LED type display panel and a prism portion having parallel wedge-shaped linear grooves engraved on a main surface and parallel to each other. And a refraction panel which is disposed on the front surface and refracts the parallel incident image light at a constant equal angle.

【0006】屈折パネルは、表示パネルと別体に配設さ
れても一体に構成されてもよい。屈折パネルのプリズム
部は視認者側の主面に配設されてもよく、表示パネル側
の主面に配設されてもよい。ただし、屈折パネルのプリ
ズム部が表示パネル側の主面に配設される場合、屈折パ
ネルのプリズム部とこのプリズム部に接する表示パネル
側の部材とは異なる屈折率を有する必要がある。
The refraction panel may be provided separately from the display panel or may be integrally formed. The prism portion of the refraction panel may be arranged on the main surface on the viewer side or may be arranged on the main surface on the display panel side. However, when the prism portion of the refraction panel is disposed on the main surface on the display panel side, the prism portion of the refraction panel and the member on the display panel side in contact with the prism portion need to have different refractive indexes.

【0007】[0007]

【作用及び発明の効果】液晶式又はLED式の表示パネ
ルの前面に配設された屈折パネルの主面には、互いに平
行な楔状直線溝からなるプリズム部が刻設されているの
で、表示パネルから屈折パネルの主面に垂直入射する画
像光はこのプリズム部で一定等角度で屈折されて、主面
に対し、斜め方向に出射される。
Since the prism portion composed of wedge-shaped linear grooves parallel to each other is engraved on the main surface of the refraction panel provided on the front surface of the liquid crystal or LED type display panel, the display panel is provided. The image light vertically incident on the main surface of the refraction panel is refracted at a constant equal angle by this prism portion, and is emitted in an oblique direction with respect to the main surface.

【0008】液晶式又はLED式の表示パネルの視認性
はその主面垂直方向を中心とする狭小角度範囲でのみ良
好であるので、上記屈折に伴い、最良視認性角度範囲は
斜め方向にシフトされ、表示パネルを斜め方向から視認
する場合の画像品質(例えばコントラスト)が格段に向
上する。
Since the visibility of the liquid crystal type or LED type display panel is good only in the narrow angle range centered on the direction perpendicular to the main surface thereof, the best visibility angle range is shifted diagonally due to the refraction. The image quality (for example, contrast) when the display panel is viewed from an oblique direction is significantly improved.

【0009】[0009]

【実施例】図1は本発明の画像表示装置の一例を示す模
式断面図であり、図2は要部拡大模式断面図である。こ
の画像表示装置は、アルミニウムを素材とする碗状のカ
バーケース1と、カバーケース1内に配設されたランプ
2と、カバーケース1の前面開口を遮蔽するとともにラ
ンプ2から放射される光を拡散する拡散ガラス板3と、
カバーケース1に固定されて拡散ガラス板3の外側に拡
散ガラス板3と平行に配設された透明アクリル樹脂板か
らなる屈折パネル4と、屈折パネル4の内面に接着され
拡散ガラス板3から所定隙間を隔てて配設された液晶パ
ネル5とを備えている。
1 is a schematic sectional view showing an example of an image display device of the present invention, and FIG. 2 is an enlarged schematic sectional view of an essential part. This image display device has a bowl-shaped cover case 1 made of aluminum, a lamp 2 arranged in the cover case 1, a front opening of the cover case 1, and a light emitted from the lamp 2. A diffusion glass plate 3 that diffuses,
A refraction panel 4 made of a transparent acrylic resin plate fixed to the cover case 1 and arranged outside the diffusion glass plate 3 in parallel with the diffusion glass plate 3, and an inner surface of the refraction panel 4 that is adhered to the refraction panel 4 to a predetermined size. The liquid crystal panel 5 is provided with a gap.

【0010】屈折パネル4は、図2に示すように、内側
すなわち液晶パネル5側の主面が平坦で、外側すなわち
視認者側の主面に互いに平行な楔状直線溝からなるマイ
クロプリズム部41を有している。51は液晶パネル5
の液晶封止ガラス板であり、これら液晶封止ガラス板5
1の間には液晶などが封止されている。以下、この画像
表示装置の作動を説明する。
As shown in FIG. 2, the refraction panel 4 has a micro-prism portion 41 having wedge-shaped linear grooves parallel to each other on the inner surface, ie, on the liquid crystal panel 5 side, and on the outer surface, ie, on the viewer's side. Have 51 is a liquid crystal panel 5
The liquid crystal sealing glass plate of
A liquid crystal or the like is sealed between the 1's. The operation of this image display device will be described below.

【0011】ランプ2から放射された光は拡散ガラス板
3で拡散され、液晶パネル5に入射する。液晶パネル5
は印加される電圧に応じて入射光の透過率を変調して所
望形状の画像光を屈折パネル4に出射する。例えば屈折
パネル4に垂直に入射する画像光は図2に示すように屈
折パネル4のマイクロプリズム部41の互いに平行なマ
イクロプリズム面42により屈折角αだけ屈折されて出
射される。
The light emitted from the lamp 2 is diffused by the diffusion glass plate 3 and enters the liquid crystal panel 5. LCD panel 5
Modulates the transmittance of incident light in accordance with the applied voltage and emits image light of a desired shape to the refraction panel 4. For example, as shown in FIG. 2, the image light vertically incident on the refraction panel 4 is refracted by the refraction angle α by the parallel microprism surfaces 42 of the microprism portion 41 of the refraction panel 4 and emitted.

【0012】ここで屈折角αは屈折パネル4に垂直に入
射する画像光に対するマイクロプリズム面42の傾角
β、及び屈折パネル4の屈折率により適宜選択される。
屈折パネル4を設けた場合(実線図示)と、屈折パネル
4を設けない場合(破線図示)における視認方向を変化
した場合のコントラスト特性を図3に示す。上記説明し
たこの実施例では、液晶パネル5の液晶封止ガラス板5
1と屈折パネル4の平坦面とを接着剤により接着してい
るので、液晶封止ガラス板51と屈折パネル4の平坦面
とを空隙を隔てて配設する場合に比べて反射を低減でき
る。
Here, the refraction angle α is appropriately selected depending on the inclination angle β of the microprism surface 42 with respect to the image light vertically incident on the refraction panel 4 and the refractive index of the refraction panel 4.
FIG. 3 shows the contrast characteristics when the viewing direction is changed when the refraction panel 4 is provided (illustrated by the solid line) and when the refraction panel 4 is not provided (illustrated by the broken line). In this embodiment described above, the liquid crystal sealing glass plate 5 of the liquid crystal panel 5 is used.
Since 1 and the flat surface of the refraction panel 4 are adhered to each other with an adhesive, the reflection can be reduced as compared with the case where the liquid crystal sealing glass plate 51 and the flat surface of the refraction panel 4 are arranged with a gap.

【0013】もちろん、屈折パネル4をガラス板や他の
透明樹脂板で形成できることは当然であり、液晶パネル
5の外側の液晶封止ガラス板51の外主面にマイクロプ
リズム部を設けてもよい。図4にこの画像表示装置を車
両の計器ハウジング6内に配設した例を示す。7はフロ
ントガラスである。運転者の反射像(例えば屈折パネル
4のマイクロプリズム部41における反射像)が視野外
となるように、液晶パネル5及び屈折パネル4は運転者
の視線方向に対して傾設されている。しかし、上記した
マイクロプリズム部41による画像光の屈折により液晶
パネル5の主面から垂直に出射された画像光は視線方向
へ進み、これにより高コントラストの視認が実現する。
It goes without saying that the refraction panel 4 can be formed of a glass plate or another transparent resin plate, and a micro prism portion may be provided on the outer main surface of the liquid crystal sealing glass plate 51 outside the liquid crystal panel 5. . FIG. 4 shows an example in which the image display device is arranged in the instrument housing 6 of the vehicle. 7 is a windshield. The liquid crystal panel 5 and the refraction panel 4 are tilted with respect to the driver's line-of-sight direction so that the reflection image of the driver (for example, the reflection image of the micro prism portion 41 of the refraction panel 4) is out of the visual field. However, the image light vertically emitted from the main surface of the liquid crystal panel 5 due to the refraction of the image light by the microprism portion 41 described above advances in the line-of-sight direction, thereby realizing high-contrast visual recognition.

【0014】またこの実施例では、マイクロプリズム部
41の各マイクロプリズム面42は水平方向に刻設され
ているが、例えば、画像表示装置が視認者(運転者)に
対して斜め下かつ横に配設されている場合、各マイクロ
プリズム面42は斜めに刻設することが好ましい。更に
上記実施例では液晶パネル5を用いたが、同様に有効視
野角が狭小なLED式の表示パネルにも適用することも
できる。
Further, in this embodiment, each microprism surface 42 of the microprism portion 41 is engraved in the horizontal direction. For example, the image display device is diagonally below and to the side of the viewer (driver). When provided, each microprism surface 42 is preferably engraved obliquely. Further, although the liquid crystal panel 5 is used in the above embodiment, it can be applied to an LED type display panel having a narrow effective viewing angle.

【図面の簡単な説明】[Brief description of drawings]

【図1】本実施例の表示装置の模式断面図である。FIG. 1 is a schematic cross-sectional view of a display device of this example.

【図2】図1の装置の要部Pを拡大した断面図である。2 is an enlarged cross-sectional view of a main part P of the device of FIG.

【図3】図1の画像光屈折状態を示す説明図である。FIG. 3 is an explanatory diagram showing the image light refraction state of FIG. 1.

【図4】図1の画像表示装置を車両の計器ハウジング内
に配設した状態を示す模式断面図である。
FIG. 4 is a schematic cross-sectional view showing a state in which the image display device of FIG. 1 is arranged in an instrument housing of a vehicle.

【図5】従来の液晶パネルの視認方向とコントラストと
の関係を示す特性図である。
FIG. 5 is a characteristic diagram showing a relationship between a viewing direction and a contrast of a conventional liquid crystal panel.

【符号の説明】[Explanation of symbols]

4 屈折パネル 5 液晶パネル(液晶式又はLED式の表示パネル) 41 マイクロプリズム部 4 Refraction panel 5 Liquid crystal panel (liquid crystal type or LED type display panel) 41 Micro prism part

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 液晶式又はLED式の表示パネルと、主
面に刻設された互いに平行な楔状直線溝からなるプリズ
ム部を有するとともに前記表示パネルの前面に配設され
平行入射画像光を一定等角度で屈折する屈折パネルとを
備えることを特徴とする画像表示装置。
1. A liquid crystal display panel or an LED display panel, and a prism portion composed of mutually parallel wedge-shaped linear grooves engraved on the main surface and arranged on the front surface of the display panel to keep parallel incident image light constant. An image display device, comprising: a refraction panel that refracts at an equal angle.
JP32054492A 1992-11-30 1992-11-30 Image display device Pending JPH06167935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32054492A JPH06167935A (en) 1992-11-30 1992-11-30 Image display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32054492A JPH06167935A (en) 1992-11-30 1992-11-30 Image display device

Publications (1)

Publication Number Publication Date
JPH06167935A true JPH06167935A (en) 1994-06-14

Family

ID=18122622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32054492A Pending JPH06167935A (en) 1992-11-30 1992-11-30 Image display device

Country Status (1)

Country Link
JP (1) JPH06167935A (en)

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