JPH01234822A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH01234822A JPH01234822A JP63060393A JP6039388A JPH01234822A JP H01234822 A JPH01234822 A JP H01234822A JP 63060393 A JP63060393 A JP 63060393A JP 6039388 A JP6039388 A JP 6039388A JP H01234822 A JPH01234822 A JP H01234822A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- crystal display
- display device
- polarizing plate
- 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
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 33
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は透過形液晶表示装置、特Ｅこバックライト部を
有する液、晶表示装置ｆこ関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a transmissive liquid crystal display device, particularly a liquid crystal display device having a backlight section.
嬉２図は、バックライト部を有する透過形液晶表示装置
の一例として、ツィステッド・ネマチック形（以下ＴＮ
形という）液晶表示装置を示す。Figure 2 shows a twisted nematic type (hereinafter referred to as TN
A type of liquid crystal display device.
同図面で、液晶表示素子１は、対向面に夫々透過性のセ
グメント電極２、コモン電極３を形成した２枚の透光性
電極基板４，５を対向させ、その周辺部をシール材６で
貼り合わせ１両基板４，５の間に捩れ構造を有するＴＮ
形液晶７を封入して構成される。In the drawing, a liquid crystal display element 1 has two translucent electrode substrates 4 and 5 facing each other, each having a transmissive segment electrode 2 and a common electrode 3 formed on their opposing surfaces, and a sealing material 6 surrounding the substrates. TN having a twisted structure between the two bonded substrates 4 and 5
It is constructed by enclosing a type liquid crystal 7.
かかる液晶表示素子１の外側の一方の電極基板４上には
上偏光板８が、他方の電極基板５上には下偏光板９が夫
々偏光軸を互いに交叉または平行させて夫々接着配置さ
れている。また、下偏光板９の下側には、スペーサを介
して一定距離、約１■離間してバックライト部１０を設
け、これを点灯し、自発光しない液晶表示素子１の表示
を暗所でも明視可能にしている（！ｌ！開昭５６−９２
１７５号公報）。An upper polarizing plate 8 is adhesively disposed on one electrode substrate 4 on the outside of the liquid crystal display element 1, and a lower polarizing plate 9 is adhesively disposed on the other electrode substrate 5 with their polarization axes crossing or parallel to each other. There is. Further, a backlight section 10 is provided below the lower polarizing plate 9 at a fixed distance of about 1 cm via a spacer, and is turned on to display the display on the liquid crystal display element 1 which does not emit light even in the dark. It makes it possible to see clearly (!l!
Publication No. 175).
第２図に示すように、上記液晶表示装置のバックライト
部１０は、光源１１１例えば冷陰極管の上側に拡散板１
２１例えば乳白色のアクリル板を。As shown in FIG. 2, the backlight unit 10 of the liquid crystal display device includes a light source 111, for example, a cold cathode tube, and a diffuser plate 11 mounted above the light source 111, for example, a cold cathode tube.
21 For example, use a milky white acrylic board.
下側に反射板１３を夫々スペーサ１４を介して、一定距
離、約２−離間して設けられ、光源１１からの発光が有
効ｌこ、かつ−様ｌこ液晶表示素子１を照射するよう構
成される。Reflective plates 13 are provided on the lower side through spacers 14 at a constant distance of about 2 mm, and are configured so that the light emitted from the light source 11 irradiates the liquid crystal display element 1 effectively and in a similar manner. be done.
このような液晶表示装置において、液晶表示素子１とバ
ックライト部１０との間の空間１５ζζ光の干渉縞が発
生し、この干渉縞（こよる輝度むらが液晶表示素子１の
表示ｌこ現われ１表示品質を著しく低下させる不都合が
生じていた。In such a liquid crystal display device, interference fringes of light in the space 15ζζ occur between the liquid crystal display element 1 and the backlight unit 10, and these interference fringes (the resulting uneven brightness appear in the display of the liquid crystal display element 1). This has caused an inconvenience that significantly deteriorates display quality.
この干渉縞は、光源１１からの光源光１１′と反射板１
３ｆこよる反射光１３′が下偏光板９の下面で反射され
る反射光９′と上記空間１５）こおいて複雑ｆこ干渉し
合って発生するものと見られ、この種の透過形液晶表示
装置の表示品質の低下の原因にもなり、問題となってい
た。This interference fringe consists of the light source light 11' from the light source 11 and the reflection plate 1.
It is thought that the reflected light 13' caused by 3f interferes with the reflected light 9' reflected by the lower surface of the lower polarizing plate 9 in a complicated manner in the space 15), and this type of transmissive liquid crystal This has been a problem since it has caused a deterioration in the display quality of the display device.
本発明の目的は、上記従来技術の問題点を解消し、干渉
縞ｌこよる輝度むらのない液晶表示装置を提倶すること
１こある。SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above and to provide a liquid crystal display device that is free from uneven brightness caused by interference fringes.
上記の目的は、対向配置された上下一対の電極基板間ｌ
こ′ＦＮ形液晶を封入し、これらを挾持し、て設けた上
下一対の偏光板を有する液晶表示素子と、上記下偏光板
に離間して設けたバックライト部とを少くとも有してお
り、上記バックライト部は、その上側に光拡散板が、下
側ｔこ元反射板が夫々配設されている液晶光示装置にお
いて、上記下偏光板の下面を光散乱面ｌこ形成すること
（こよって達成される。The above purpose is to
This device includes at least a liquid crystal display element having a pair of upper and lower polarizing plates that enclose an FN-type liquid crystal and sandwiching these, and a backlight section that is spaced apart from the lower polarizing plate. In a liquid crystal display device in which the backlight section is provided with a light diffusing plate on its upper side and a lower reflecting plate on its lower side, the lower surface of the lower polarizing plate is formed as a light scattering surface. (Thus, this is achieved.
上記手段（こよって、下偏光板の下面が光散乱面（こ形
成されているので、光源からの光源光や反射板からの反
射光が下偏光板の下面で光散乱され、下偏光板をこよる
反射光が生じない。従って、上記光源からの光源光や反
射板ｆこよる反射光が光干渉し、これｌこより干渉縞が
生じ、懺示特性を低下させる原因が解消する。The above means (therefore, since the lower surface of the lower polarizing plate is formed with a light scattering surface), the light source light from the light source and the reflected light from the reflecting plate are scattered on the lower surface of the lower polarizing plate, and the lower surface of the lower polarizing plate is Therefore, the source light from the light source and the light reflected by the reflection plate F interfere with each other, which causes interference fringes and deteriorates the display characteristics.
以下、本発明の一実施例を図面ｆこより説明する。 An embodiment of the present invention will be described below with reference to drawing f.
第２図と同一部材ｌこは同一符号を付する。第１図は、
本発明の液晶表示装置の要部断面図である。Components that are the same as those in FIG. 2 are given the same reference numerals. Figure 1 shows
1 is a sectional view of a main part of a liquid crystal display device of the present invention.
本発明の液晶表示素子１の部分は第２図の構成と同一で
あるが、本発明は下偏光板９の下面を光散乱面１６、例
えば微細な粗面１こ形成し、これによって光源１１から
の光源光１１′および反射板１３からの反射光１３′が
下偏光板９の下面１６で光散乱されるよう構成する。こ
うすることｆこよって、上記光源光１１′および反射光
１３′が光干渉することがないので、光干渉ζこよる輝
度むらが液晶表示素子の表示なこ現われない。The structure of the liquid crystal display element 1 according to the present invention is the same as that shown in FIG. The light source light 11' from the light source and the reflected light 13' from the reflecting plate 13 are scattered by the lower surface 16 of the lower polarizing plate 9. By doing this, there is no optical interference between the light source light 11' and the reflected light 13', so that uneven brightness due to optical interference ζ does not appear in the display of the liquid crystal display element.
また、液晶表示素子１を通る外来光が前記バックライト
部１０の上面、すなわち、拡散板１２の上面で反射し、
これと上記光源光１１′および反射光１３′と光干渉し
て上記空間１５に干渉縞が発生する場合があるので、上
記拡散板１２の上面を光散乱面１７、例えば微細な粗面
に形成することによって、上記干渉縞ｆこよる輝度むら
を防除すれば、更ｆこ効果的である。Further, external light passing through the liquid crystal display element 1 is reflected on the upper surface of the backlight section 10, that is, the upper surface of the diffusion plate 12,
Since interference fringes may occur in the space 15 due to optical interference between this and the light source light 11' and the reflected light 13', the upper surface of the diffuser plate 12 is formed into a light scattering surface 17, for example, a finely roughened surface. By doing so, it is even more effective to prevent uneven brightness caused by the interference fringes.
以上述べた本発明ｆこよって、液晶表示素子とバックラ
イト部との空間（こ光干渉による干渉縞が発生しないの
で、干渉縞による輝度むらのない優れた表示特性をもつ
液晶表示装置が得られる。According to the present invention described above, since no interference fringes are generated due to light interference in the space between the liquid crystal display element and the backlight section, it is possible to obtain a liquid crystal display device having excellent display characteristics without uneven brightness due to interference fringes. .
第１図は、本発明の液晶表示装置の一実施例を示す要部
断面図、第２図は、従来の液晶表示装置の要部断面図で
ある。
１・・・液晶表示素子、４，５・・・電極基板、８・・
・上偏光板、 ９・・・下偏光板、１０・・・
バックライト部、１１・・・光源、１２・・・拡散板、
１３・・・反射板、１５・・・空間、 １６
．１７・・・光散乱面。FIG. 1 is a sectional view of a main part showing an embodiment of a liquid crystal display device of the present invention, and FIG. 2 is a sectional view of a main part of a conventional liquid crystal display device. 1... Liquid crystal display element, 4, 5... Electrode substrate, 8...
・Upper polarizing plate, 9...Lower polarizing plate, 10...
backlight section, 11... light source, 12... diffuser plate,
13...Reflector, 15...Space, 16
．． 17...Light scattering surface.
Claims (1)
を封入し、これらを挾持する上下一対の偏光板を有する
液晶表示素子と、上記下偏光板に離間して設けたバック
ライト部とを少くとも有し、上記バックライト部は、そ
の上側に光拡散板を、下側に光反射板を夫々設けてなる
液晶表示装置において、上記下偏光板の下面に光散乱面
を形成したことを特徴とする液晶表示装置。 ２、特許請求の範囲第１項において、上記バックライト
部の上面を光散乱面に形成したことを特徴とする液晶表
示装置。[Scope of Claims] 1. A liquid crystal display element having a TN type liquid crystal sealed between a pair of upper and lower electrode substrates arranged opposite to each other, and a pair of upper and lower polarizing plates sandwiching these; In a liquid crystal display device having at least a backlight section provided with a light beam on the lower surface of the lower polarizing plate, the backlight section includes a light diffusing plate on the upper side thereof and a light reflecting plate on the lower side thereof. A liquid crystal display device characterized by forming a scattering surface. 2. The liquid crystal display device according to claim 1, wherein the upper surface of the backlight section is formed as a light scattering surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63060393A JPH01234822A (en) | 1988-03-16 | 1988-03-16 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63060393A JPH01234822A (en) | 1988-03-16 | 1988-03-16 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01234822A true JPH01234822A (en) | 1989-09-20 |
Family
ID=13140865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63060393A Pending JPH01234822A (en) | 1988-03-16 | 1988-03-16 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01234822A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05173133A (en) * | 1991-12-25 | 1993-07-13 | Sharp Corp | Lighting device for liquid crystal |
| US6624937B2 (en) | 1998-04-06 | 2003-09-23 | Dai Nippon Printing Co., Ltd. | Polarization splitting sheet, optical sheet laminate, planar light source apparatus, and transmission-type display apparatus |
| US7030944B2 (en) | 1998-12-14 | 2006-04-18 | Nec Lcd Technologies, Ltd. | Liquid crystal display device with roughened surfaces to reduce moiré fringe effects |
| JP2018124353A (en) * | 2017-01-30 | 2018-08-09 | 京セラディスプレイ株式会社 | Liquid crystal display |
-
1988
- 1988-03-16 JP JP63060393A patent/JPH01234822A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05173133A (en) * | 1991-12-25 | 1993-07-13 | Sharp Corp | Lighting device for liquid crystal |
| US6624937B2 (en) | 1998-04-06 | 2003-09-23 | Dai Nippon Printing Co., Ltd. | Polarization splitting sheet, optical sheet laminate, planar light source apparatus, and transmission-type display apparatus |
| US7030944B2 (en) | 1998-12-14 | 2006-04-18 | Nec Lcd Technologies, Ltd. | Liquid crystal display device with roughened surfaces to reduce moiré fringe effects |
| JP2018124353A (en) * | 2017-01-30 | 2018-08-09 | 京セラディスプレイ株式会社 | Liquid crystal display |
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