JPH04104125A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH04104125A JPH04104125A JP2220034A JP22003490A JPH04104125A JP H04104125 A JPH04104125 A JP H04104125A JP 2220034 A JP2220034 A JP 2220034A JP 22003490 A JP22003490 A JP 22003490A JP H04104125 A JPH04104125 A JP H04104125A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- diffusion sheet
- plate
- crystal panel
- fresnel prism
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 41
- 238000009792 diffusion process Methods 0.000 claims abstract description 29
- 238000005286 illumination Methods 0.000 abstract description 4
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
・ ［産業上の利用分野］
この発明は、リニアフレネルプリズム板を用いたエツジ
ライト方式の照明装置をツク・ツクライトとして用いた
液晶表示装置に関するものである。[Detailed Description of the Invention] - [Industrial Application Field] The present invention relates to a liquid crystal display device using an edge light type illumination device using a linear Fresnel prism plate as a light source.
［従来の技術］
液晶表示装置は目ら発光することがない受動形表示装置
であり、光の透過率あるいは反射率を制御することによ
り自然光等の照明光あるいは内部に設けたバックライト
の照明光を変調し、ノブター２表示を行う。特に、カラ
ーフィルムを用いた液晶表示装置の場合には光量が減少
するため、表示を見易くする目的でバックライトを付設
することが必須の要件となっている。さらに、ポータプ
ルテレビやラップトツブパソコンの用途として、高輝度
、薄形の液晶表示装置を実現するために、高性能の照明
装置の開発が望まれている。この場合に、バックライト
としての装置の奥行を小さくできるエツジライト方式が
提案、されている。[Prior Art] A liquid crystal display device is a passive display device that does not emit light to the eye, and by controlling the transmittance or reflectance of light, it can be used to control illumination light such as natural light or illumination light from a backlight provided inside. modulates and displays Nobuter 2. In particular, in the case of a liquid crystal display device using a color film, since the amount of light is reduced, it is essential to provide a backlight for the purpose of making the display easier to see. Furthermore, the development of high-performance lighting devices is desired in order to realize high-brightness, thin liquid crystal display devices for use in portable televisions and laptop computers. In this case, an edge light method has been proposed and used which can reduce the depth of the device as a backlight.
第２図は例えば特願平０１−２５９２８１号明細書に示
された従来のエツジライト方式のバックライトを用いた
液晶表示装置を示す側断面図であり、図において（１）
は一定のピッチの画素を有する液晶セル（２）とその液
晶セル（２）の上・下面に貼付られた偏光板（３ａ）、
（３ｂ）とからなる液晶パネル、（４）はその液晶パ
ネル（１）の裏面に貼付あるいは密着され、光の拡散を
行う拡散シート、（５）は拡散シ−ト（４）と間隙（８
）をもって配置され、一定のピッチで形成された入反射
面（５ａ）、 （５ｂ） 、および出射面（５ｃ）から
なるリニアフレネルプリズム板、（６）はそのリニアフ
レネルプリズム板（５）の下部に配置された導光板、（
７）は導光板（６）の端面に配置され、蛍光ランプ等の
管状光源である。FIG. 2 is a side cross-sectional view showing a liquid crystal display device using a conventional edge-light type backlight as disclosed in, for example, Japanese Patent Application No. 01-259281.
is a liquid crystal cell (2) having pixels with a constant pitch, a polarizing plate (3a) attached to the upper and lower surfaces of the liquid crystal cell (2),
(3b) is a liquid crystal panel, (4) is a diffusion sheet that is attached or adhered to the back side of the liquid crystal panel (1) and diffuses light, and (5) is a diffusion sheet (4) and a gap (8).
), the linear Fresnel prism plate is composed of input/reflection surfaces (5a), (5b), and output surfaces (5c) formed at a constant pitch, and (6) is the lower part of the linear Fresnel prism plate (5). The light guide plate placed in (
7) is arranged on the end face of the light guide plate (6) and is a tubular light source such as a fluorescent lamp.
従来の液晶表示装置は上記のように構成され、点灯装置
（図示せず）を起動することにより管状光源（７）から
発生した一定輝度の光は端面から導光板（６）内に入射
して集光され、リニアフレネルプリズム板（５）に出射
される。この出射光は一方ではリニアフレネルプリズム
板（５）の入反射面（５ａ）に入射した後入反射面（５
ｂ）で反射され、他方では入反射面（５ｂ）に入射した
後入反射面（５ａ）で反射され、出射面（５Ｃ）からほ
ぼ垂直に出射する。この光を拡散ノート（４）で光拡散
し、液晶／Ｘ＋ネル（１）で変調してパターン表示を行
う。A conventional liquid crystal display device is constructed as described above, and when the lighting device (not shown) is activated, light of a constant brightness generated from the tubular light source (7) enters the light guide plate (6) from the end surface. The light is focused and emitted to a linear Fresnel prism plate (5). On the one hand, this emitted light enters the input reflection surface (5a) of the linear Fresnel prism plate (5), and then enters the input reflection surface (5a) of the linear Fresnel prism plate (5).
b), and on the other hand, after entering the input reflection surface (5b), it is reflected at the input reflection surface (5a) and exits almost perpendicularly from the output surface (5C). This light is diffused by a diffusion notebook (4) and modulated by a liquid crystal/X+ channel (1) to display a pattern.
［発明が解決しようとする課題］
上記のような従来の液晶表示装置では、薄形化の要求が
強く、バックライトの薄形化が必要となり、結果として
管状光源（７）を狭いスペースに閉じこめる構成となり
、管状光源（７）から発生した熱が放熱しに＜＜、液晶
パネル（１）および拡散ン−１−（４）付近の温度が上
昇してしまう。この温度の上昇に伴って、第３図に示す
ように拡散シート（４）が液晶パネル（１）からモアレ
縞を軽減するために設けられた間隙（８）側に解離し、
モアレ縞を発現し、画質の低下を招くきいう問題点があ
った。[Problems to be Solved by the Invention] In the conventional liquid crystal display device as described above, there is a strong demand for thinning, and it is necessary to make the backlight thinner, and as a result, the tubular light source (7) is confined in a narrow space. As a result, the heat generated from the tubular light source (7) is dissipated and the temperature in the vicinity of the liquid crystal panel (1) and the diffusion panel (1) increases. As the temperature rises, the diffusion sheet (4) dissociates from the liquid crystal panel (1) toward the gap (8) provided to reduce moiré fringes, as shown in FIG.
There was a problem in that moiré fringes appeared and the image quality deteriorated.
この発明は、かかる問題点を解決するためになされたも
ので、光源点灯時に発生する熱によって誘発される拡散
／−トの液晶パネルからの解離を防止し、表示特性の劣
化を防止することのできる液晶表示装置を得ることを目
的とする。The present invention has been made to solve this problem, and is aimed at preventing the dissociation of the diffusion layer from the liquid crystal panel caused by the heat generated when the light source is turned on, and thereby preventing the deterioration of display characteristics. The purpose is to obtain a liquid crystal display device that can
［課題を解決するための手段］
この発明に係る液晶表示装置は、液晶パネルの裏面に設
けられた拡散シートとリニアフレネルプリズム板との間
隙に透明板を挿入したものである。[Means for Solving the Problems] A liquid crystal display device according to the present invention has a transparent plate inserted into a gap between a diffusion sheet and a linear Fresnel prism plate provided on the back surface of a liquid crystal panel.
Ｕ作 用コ
この発明においては、拡散シートとりニアフレネルプリ
ズム板との間隙に挿入された透明板か、拡散シートを支
持しているので、ツクツクライトの昇温による液晶パネ
ルからの拡散シートの解離を防止する。In this invention, since the diffusion sheet is supported by a transparent plate inserted in the gap between the diffusion sheet and the near Fresnel prism plate, the diffusion sheet is prevented from disassociating from the liquid crystal panel due to the temperature rise of the light. prevent.
［実施例］ 以下、この発明の実施例を図について説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図はこの発明の一実施例を示す断面図であって、第
１図に示す従来の液晶表示装置と同一または相当部分は
同一符号を付し、その説明を省略する。FIG. 1 is a sectional view showing an embodiment of the present invention, and the same or corresponding parts as those of the conventional liquid crystal display device shown in FIG.
図において、（９）はアクリル、ポリカーボネートなど
の透明板であり、拡散シート（４）とりニアフレネルプ
リズム板（５）との間隙（８）に挿入されている。In the figure, (9) is a transparent plate made of acrylic, polycarbonate, etc., which is inserted into the gap (8) between the diffusion sheet (4) and the near Fresnel prism plate (5).
このように構成されている液晶表示装置では、管状光源
（７）が点灯装置（図示せず）の電圧印加によって所定
の輝度をもつ光を発生し、その光力（導光板（６）、リ
ニアフレネルプリズム板（５）、透明板（９）を通過し
、拡散シート（４）で光拡散し、液晶パネル（１）で変
調してパターン表示する。In the liquid crystal display device configured in this way, the tubular light source (7) generates light with a predetermined brightness by applying a voltage from a lighting device (not shown), and its light power (light guide plate (6), linear The light passes through a Fresnel prism plate (5) and a transparent plate (9), is diffused by a diffusion sheet (4), and is modulated by a liquid crystal panel (1) to display a pattern.
ここで、管状光源（ア）で発生した熱は、導光板（６）
、リニアフレネルプリズム板（５）、透明板（９）、拡
散シート（４）を介して液晶パネル（１）に伝導され、
拡散シート（４）の熱変形を招くが、透明板〈９）によ
り液晶パネル（１）からの拡散シート（４）の解離を防
止している。Here, the heat generated by the tubular light source (a) is transferred to the light guide plate (6).
, is conducted to the liquid crystal panel (1) via the linear Fresnel prism plate (5), the transparent plate (9), and the diffusion sheet (4),
Although thermal deformation of the diffusion sheet (4) is caused, the transparent plate (9) prevents the diffusion sheet (4) from disassociating from the liquid crystal panel (1).
この実施例では、０．５〜５ｍｍ厚のアクリル板を透明
板（９）とし、リニアフレネルプリズム板（５）のプリ
ズムピッチを液晶パネル（１）の画素ピッチの２倍±４
０％に設定し、管状光源（７）の点灯時に発生する熱に
よって誘発される液晶表示特性の劣化が防止され、均一
性の優れた表示特性をもつ液晶表示装置が実現された。In this example, the transparent plate (9) is an acrylic plate with a thickness of 0.5 to 5 mm, and the prism pitch of the linear Fresnel prism plate (5) is twice the pixel pitch of the liquid crystal panel (1) ±4.
By setting it to 0%, deterioration of liquid crystal display characteristics induced by heat generated when the tubular light source (7) is turned on was prevented, and a liquid crystal display device with display characteristics with excellent uniformity was realized.
［発明の効果］
以上のように、この発明によれば透明板を拡散ノートと
りニアフレネルプリズム板との間隙に挿入したので、バ
ックライトの昇温で発生する液晶パネルからの拡散／−
トの解離を防止でき、表示特性の劣化を防止でき、表示
特性の均一性が実現でき、経時的な特性劣化を防止でき
る液晶表示装置が得られる効果がある。[Effects of the Invention] As described above, according to the present invention, the transparent plate is inserted into the gap between the diffusion notebook and the near Fresnel prism plate, so that the diffusion from the liquid crystal panel caused by the temperature rise of the backlight can be prevented.
This has the effect of providing a liquid crystal display device that can prevent the dissociation of particles, prevent deterioration of display characteristics, achieve uniformity of display characteristics, and prevent deterioration of characteristics over time.
第１図はこの発明の一実施例による液晶表示装置を示す
側断面図、第２図および第３図は従来の液晶表示装置の
それぞれの使用態様を示す側断面図である。
図において、（１）は液晶パネル、（４）は拡散シート
、（５）はりニアフレ不ルブリス゛ムＬ （６）は導光
板、（７）は管状光源、（８）は間隙、（９）は透明板
である。
なお、各図面中間−符号は同一または相当部分を示す。FIG. 1 is a side cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention, and FIGS. 2 and 3 are side cross-sectional views showing respective usage modes of a conventional liquid crystal display device. In the figure, (1) is a liquid crystal panel, (4) is a diffusion sheet, (5) is a beam of near-flashless rim L, (6) is a light guide plate, (7) is a tubular light source, (8) is a gap, and (9) is transparent. It is a board. Note that reference numerals in the middle of each drawing indicate the same or corresponding parts.
Claims (1)
ネルの裏面に設けられた拡散シートと、この拡散シート
と間隙をもって配置され、一定のピッチで入射面と反射
面のパターンを有するリニアフレネルプリズム板と、こ
のリニアフレネルプリズムの裏面に設けられ端面に光源
を配置した導光板とを備えた液晶表示装置において、前
記間隙に前記拡散シートを支持する透明板を挿入したこ
とを特徴とする液晶表示装置。A liquid crystal panel having pixels at a constant pitch, a diffusion sheet provided on the back side of the liquid crystal panel, and a linear Fresnel prism plate arranged with a gap from the diffusion sheet and having a pattern of incident surfaces and reflective surfaces at a constant pitch. A liquid crystal display device comprising a light guide plate provided on the back surface of the linear Fresnel prism and having a light source disposed on the end surface, wherein a transparent plate supporting the diffusion sheet is inserted in the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2220034A JP2803899B2 (en) | 1990-08-23 | 1990-08-23 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2220034A JP2803899B2 (en) | 1990-08-23 | 1990-08-23 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04104125A true JPH04104125A (en) | 1992-04-06 |
| JP2803899B2 JP2803899B2 (en) | 1998-09-24 |
Family
ID=16744890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2220034A Expired - Lifetime JP2803899B2 (en) | 1990-08-23 | 1990-08-23 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2803899B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5550657A (en) * | 1992-09-14 | 1996-08-27 | Fujitsu Limited | Liquid crystal display device having an optimized ridged layer to improve luminosity |
| KR100843287B1 (en) * | 2006-07-24 | 2008-07-03 | 주식회사 영실업 | Light controlling structure and the surface lightning device using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58109786U (en) * | 1982-01-20 | 1983-07-26 | カルソニックカンセイ株式会社 | Display panel lighting device |
| JPS61158367A (en) * | 1984-12-29 | 1986-07-18 | シャープ株式会社 | Lighting apparatus |
| JPH01209479A (en) * | 1988-02-17 | 1989-08-23 | Tama Denki Kogyo Kk | Back illuminator |
| JPH0486620A (en) * | 1990-07-27 | 1992-03-19 | Mitsubishi Electric Corp | Liquid crystal display device |
-
1990
- 1990-08-23 JP JP2220034A patent/JP2803899B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58109786U (en) * | 1982-01-20 | 1983-07-26 | カルソニックカンセイ株式会社 | Display panel lighting device |
| JPS61158367A (en) * | 1984-12-29 | 1986-07-18 | シャープ株式会社 | Lighting apparatus |
| JPH01209479A (en) * | 1988-02-17 | 1989-08-23 | Tama Denki Kogyo Kk | Back illuminator |
| JPH0486620A (en) * | 1990-07-27 | 1992-03-19 | Mitsubishi Electric Corp | Liquid crystal display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5550657A (en) * | 1992-09-14 | 1996-08-27 | Fujitsu Limited | Liquid crystal display device having an optimized ridged layer to improve luminosity |
| KR100843287B1 (en) * | 2006-07-24 | 2008-07-03 | 주식회사 영실업 | Light controlling structure and the surface lightning device using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2803899B2 (en) | 1998-09-24 |
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