JPH0437718A - liquid crystal display device - Google Patents
liquid crystal display deviceInfo
- Publication number
- JPH0437718A JPH0437718A JP2144318A JP14431890A JPH0437718A JP H0437718 A JPH0437718 A JP H0437718A JP 2144318 A JP2144318 A JP 2144318A JP 14431890 A JP14431890 A JP 14431890A JP H0437718 A JPH0437718 A JP H0437718A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- light source
- ray tube
- cathode ray
- 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 31
- 238000009792 diffusion process Methods 0.000 claims description 2
- 229910052729 chemical element Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は液晶表示装置に係り、特に背面光源を有する液
晶表示装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a backlight source.
光源として冷陰極線管を用（・、液晶表示素子の背面側
に光を照射させ、液晶表示装置に鮮明な表示を行う技術
は、例えば特開昭６３−２７９２２０号公報および特公
昭５８−１７９５７号公報等に開示されている。Techniques that use a cold cathode ray tube as a light source to provide a clear display on a liquid crystal display device by irradiating light onto the back side of a liquid crystal display element are disclosed, for example, in Japanese Patent Laid-Open No. 63-279220 and Japanese Patent Publication No. 58-17957. Disclosed in official gazettes, etc.
この技術は、第２図に示すように、表示部、すなわち液
晶表示素子ｌの背面に光拡散板２、導光板３および反射
板４ｔ−この順序に設け、導光板３の端部に光源５とし
て冷陰極線管を配置してなり、光源５から放射した光が
上記部材２．３．４によって面光源に変換され、液晶表
示子１に均一な光を照射するようにしたものである。な
お、上記装置において、６は光源反射板、７はフレーム
、８は回路基板である。In this technology, as shown in FIG. 2, a light diffuser plate 2, a light guide plate 3, and a reflector plate 4t are provided in this order on the back side of a display section, that is, a liquid crystal display element l, and a light source 5 is provided at the end of the light guide plate 3. The light emitted from the light source 5 is converted into a surface light source by the member 2.3.4, and the liquid crystal display element 1 is irradiated with uniform light. In the above device, 6 is a light source reflection plate, 7 is a frame, and 8 is a circuit board.
また、液晶表示素子の光源としてＥＬ（エレクトロルミ
ネセンス）素子音用い、装置を薄形に形成する技術が、
例えば、特開昭５５−１６１２７２号公報および特開昭
５７−５２０９３号公報等に開示されている。In addition, there is a technology that uses EL (electroluminescence) elements as light sources for liquid crystal display elements to make devices thinner.
For example, it is disclosed in JP-A-55-161272 and JP-A-57-52093.
この技術は、第３図に示すように、液晶表示素子ｌの背
面側に透明電極９ａ１絶縁薄膜９ｂ、ＥＬ層（例えば、
Ｚｎ系ＥＬ層）９０１反射電極９ｄからなるＥＬ素子９
を設け、ＥＬ素子９を発光させ、液晶表示素子ｌに均一
な光を照射するようＫしたものである。As shown in FIG. 3, this technology includes a transparent electrode 9a1, an insulating thin film 9b, an EL layer (for example,
Zn-based EL layer) 901 EL element 9 consisting of reflective electrode 9d
is provided so that the EL element 9 emits light and the liquid crystal display element 1 is irradiated with uniform light.
上記従来の液晶表示装置において、光源として冷陰極線
管４を使用する第２図の場合には、液晶表示装置が大形
になると、面光源に必要な２５０ｃｄ／ｒｒｔ以上の明
るさを確保するため、外径の大きい（例えば６６５ｎ以
上）冷陰極線管を配設することが必要とされる。そのた
め、液晶表示装置を薄形に形成することができない。In the case of the conventional liquid crystal display device shown in FIG. 2, which uses a cold cathode ray tube 4 as a light source, when the liquid crystal display device becomes large, it is necessary to ensure a brightness of 250 cd/rrt or more required for a surface light source. , it is necessary to install a cold cathode ray tube with a large outer diameter (for example, 665 nm or more). Therefore, the liquid crystal display device cannot be made thin.
また、光源としてＥＬ素子を使用する第３図の場合には
、液晶表示装置を薄形に形成できるが、光源の明るさが
５０ｃｄ／ゴ程度なので、 面光源に必要な２５０ｃｄ
／−ｒｒｅ以上の明るさが得られない。In addition, in the case of Fig. 3 in which an EL element is used as a light source, the liquid crystal display device can be made thin, but since the brightness of the light source is about 50 cd/g, the brightness of the 250 cd required for a surface light source is reduced.
/-rre or higher brightness cannot be obtained.
本発明の目的は、明るい面光源が得られると共に、装置
を薄形に形成できる液晶表示装置を提供することにある
。An object of the present invention is to provide a liquid crystal display device that provides a bright surface light source and that can be formed into a thin device.
上記の目的は、液晶表示素子の背面側端部に冷陰極線管
を設けた液晶表示装置において、液晶表示素子の背面に
ＥＬ素子を設けることによって達成される。The above object is achieved by providing an EL element on the back side of the liquid crystal display element in a liquid crystal display device in which a cold cathode ray tube is provided on the back end of the liquid crystal display element.
〔作用〕
上記の手段によって、冷陰極線管とＥＬ素子の両者の光
が併合されるので、径小の冷陰極線管を使用しても装置
を薄形にすることができ、かつ明るい面光源を得ること
ができる。[Operation] By the above means, the light from both the cold cathode ray tube and the EL element is combined, so even if a cold cathode ray tube with a small diameter is used, the device can be made thin, and a bright surface light source can be used. Obtainable.
以下、本発明の一実施例を第１図により説明する。なお
同図において、前記第２図および第３図と同一または同
一機能を有する部材には同一符号を付して、その説明を
省略する。An embodiment of the present invention will be described below with reference to FIG. In this figure, members that are the same or have the same functions as those in FIGS. 2 and 3 are designated by the same reference numerals, and their explanations will be omitted.
第１図の液晶表示装置は、液晶表示素子１の背面側に光
拡散板２と導光板３をこの順序に設け、面光源用の光源
として上記導光板３の端部に冷陰極線管４を、また導光
板３の背面にＥＬ素子９を設けてなる。In the liquid crystal display device shown in FIG. 1, a light diffusing plate 2 and a light guide plate 3 are provided in this order on the back side of a liquid crystal display element 1, and a cold cathode ray tube 4 is installed at the end of the light guide plate 3 as a light source for a surface light source. Further, an EL element 9 is provided on the back surface of the light guide plate 3.
このように液晶表示装置全構成すると、冷陰極線管４と
ＥＬ素子９０両者の光が併合されるので、径小の冷陰極
線管５を使用しても必要な明るさの面光源を得ることが
できる。When the entire liquid crystal display device is configured in this way, the light from both the cold cathode ray tube 4 and the EL element 90 are combined, so even if the small diameter cold cathode ray tube 5 is used, a surface light source with the necessary brightness can be obtained. can.
例えば、外径４ｎ程度の径小の冷陰極線管５を使用する
と、その明るさは２００ ｃｄ／ｍ 程度なので、ＥＬ
素子９の明るさ５０ ｃｄ／ゴ程度と併合されて２５０
ｃｄ／ゴ程度の明るさの面光源を得ることができる。For example, if a cold cathode ray tube 5 with a small outer diameter of about 4n is used, its brightness is about 200 cd/m, so the EL
The brightness of element 9 is about 50 cd/g combined with 250
It is possible to obtain a surface light source with brightness on the order of CD/G.
その結果、従来のＥＬ素子９だけを使用する場合よりも
明るい面光源が得られ、しかも径大の冷陰極線管５だけ
を使用する場合よりも装置を薄形にすることができる。As a result, a brighter surface light source can be obtained than when only the conventional EL element 9 is used, and the device can be made thinner than when only the large diameter cold cathode ray tube 5 is used.
以上述べた本発明により、薄形で明るい面光源を有する
液晶表示装置を得ることができる。According to the present invention described above, it is possible to obtain a liquid crystal display device that is thin and has a bright surface light source.
第１図は本発明による液晶表示装置の一実施例になる要
部断面図、第２図は光源に冷陰極線管を使用した従来の
液晶表示装置の要部断面図、第３図は光源にＥＬ素子を
使用した従来の液晶表示装置を示し、（ム）は要部断面
図、（Ｂ）は（Ａｌに使用されるＥＬ素子の拡大断面図
である。
１・・・液晶表示素子、 ２・・・光拡散板、３・
・・導光板、 ４・・・反射板、５・・・光源（冷
陰極線管）、 ８・・・回路基板、９・・・光源（Ｅ
Ｌ素子）。FIG. 1 is a sectional view of a main part of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part of a conventional liquid crystal display device using a cold cathode ray tube as a light source, and FIG. A conventional liquid crystal display device using an EL element is shown, (m) is a cross-sectional view of a main part, and (B) is an enlarged cross-sectional view of an EL element used in (Al). 1...Liquid crystal display element, 2 ...Light diffusion plate, 3.
...Light guide plate, 4...Reflector, 5...Light source (cold cathode ray tube), 8...Circuit board, 9...Light source (E
L element).
Claims (1)
上記導光板の端部に冷陰極線管を配置してなる液晶表示
装置において、上記導光板の背面にＥＬ素子を設けたこ
とを特徴とする液晶表示装置。1. A light diffusion plate and a light guide plate are provided on the back side of the liquid crystal display element,
A liquid crystal display device comprising a cold cathode ray tube disposed at an end of the light guide plate, characterized in that an EL element is provided on the back surface of the light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2144318A JPH0437718A (en) | 1990-06-04 | 1990-06-04 | liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2144318A JPH0437718A (en) | 1990-06-04 | 1990-06-04 | liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0437718A true JPH0437718A (en) | 1992-02-07 |
Family
ID=15359303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2144318A Pending JPH0437718A (en) | 1990-06-04 | 1990-06-04 | liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437718A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111622A (en) * | 1993-03-12 | 2000-08-29 | Ois Optical Imaging Systems, Inc. | Day/night backlight for a liquid crystal display |
| US6288761B1 (en) | 1998-08-04 | 2001-09-11 | Nec Corporation | Backlight of liquid crystal display having subsidiary electro-luminescence lamp |
| WO2010067751A1 (en) | 2008-12-09 | 2010-06-17 | 住友化学株式会社 | Method for manufacturing chlorine |
| WO2010073888A1 (en) | 2008-12-22 | 2010-07-01 | 住友化学株式会社 | Chlorine manufacturing method |
-
1990
- 1990-06-04 JP JP2144318A patent/JPH0437718A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111622A (en) * | 1993-03-12 | 2000-08-29 | Ois Optical Imaging Systems, Inc. | Day/night backlight for a liquid crystal display |
| US6288761B1 (en) | 1998-08-04 | 2001-09-11 | Nec Corporation | Backlight of liquid crystal display having subsidiary electro-luminescence lamp |
| WO2010067751A1 (en) | 2008-12-09 | 2010-06-17 | 住友化学株式会社 | Method for manufacturing chlorine |
| WO2010073888A1 (en) | 2008-12-22 | 2010-07-01 | 住友化学株式会社 | Chlorine manufacturing method |
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