JPH0820632B2 - Transmissive liquid crystal display device - Google Patents
Transmissive liquid crystal display deviceInfo
- Publication number
- JPH0820632B2 JPH0820632B2 JP61234357A JP23435786A JPH0820632B2 JP H0820632 B2 JPH0820632 B2 JP H0820632B2 JP 61234357 A JP61234357 A JP 61234357A JP 23435786 A JP23435786 A JP 23435786A JP H0820632 B2 JPH0820632 B2 JP H0820632B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- light source
- fluorescent lamp
- 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.)
- Expired - Lifetime
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
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133334—Electromagnetic shields
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、液晶表示部の背面から光を照射する透過型
液晶表示装置に係わり、特に照射光源として螢光灯を用
いる型のものに関する。The present invention relates to a transmissive liquid crystal display device that irradiates light from the back surface of a liquid crystal display unit, and particularly uses a fluorescent lamp as an irradiation light source. Regarding type things.
（従来の技術） 近年、テレビジョン信号を液晶により表示するいわゆ
る液晶テレビが急速に実用化、普及しつつある。液晶テ
レビにも種々の構造のものがあるが、その中でも、液晶
テレビ自体に光源を有し背面から光を照射するバックラ
イト型のものは、暗い場所においても見ることができて
便利である。更に、カラー像を表示するカラー液晶テレ
ビでは光源が白色であることが望ましいから、多くの場
合螢光灯が光源として用いられる。即ち、例えば第４図
（ａ），（ｂ）に示すように液晶表示部（液晶パネル）
（１）の背面に所定距離離してＵ字形の螢光灯（２）を
設定する。この螢光灯の光が拡散されて液晶表示部に照
射されるように裏面に当接して拡散板（３）が設けら
れ、又螢光灯（２）の発する光が効率よく液晶表示部
（１）に当てられるように反射板（４）が設けられる。
したがって液晶表示部（１）の正面から見ると、裏面全
体に光が当てられているように見える。(Prior Art) In recent years, so-called liquid crystal televisions that display television signals by liquid crystal have been rapidly put into practical use and are becoming widespread. There are various types of liquid crystal televisions, and among them, the backlight type that has a light source in the liquid crystal television itself and emits light from the back is convenient because it can be seen even in a dark place. Further, in a color liquid crystal television displaying a color image, it is desirable that the light source is white, so that a fluorescent lamp is often used as the light source. That is, for example, as shown in FIGS. 4A and 4B, a liquid crystal display unit (liquid crystal panel)
Set a U-shaped fluorescent lamp (2) on the back of (1) at a predetermined distance. A diffuser plate (3) is provided in contact with the back surface so that the light of the fluorescent lamp is diffused and irradiated to the liquid crystal display section, and the light emitted by the fluorescent lamp (2) is efficiently supplied to the liquid crystal display section ( A reflector (4) is provided so as to be applied to 1).
Therefore, when viewed from the front of the liquid crystal display unit (1), it seems that the entire back surface is illuminated.
しかしながら、上記の螢光灯光源を有する液晶テレビ
では、当然に放電が生じており、これが液晶に影響を与
えて表示画像に縞模様を生ずる等画質の劣化をきたすお
それがあった。さらに低温下では、蛍光灯の点灯が安定
せず良好な画像が得られないことがあった。However, in the liquid crystal television having the above-mentioned fluorescent light source, discharge naturally occurs, and this may affect the liquid crystal and cause deterioration in image quality such as a striped pattern in the displayed image. Further, at low temperature, the lighting of the fluorescent lamp was not stable and a good image could not be obtained in some cases.
（発明が解決しようとする問題点） 本発明は、上述のような螢光灯光源を有する液晶表示
装置において放電および低温下での使用によって生ずる
画質劣化に鑑みてなされたもので、良好な画像が得られ
る透過型液晶表示装置を提供することを目的とする。(Problems to be Solved by the Invention) The present invention has been made in view of image quality deterioration caused by discharge and use at low temperature in a liquid crystal display device having a fluorescent light source as described above. It is an object of the present invention to provide a transmissive liquid crystal display device that can obtain the above.
（問題点を解決するための手段） 本発明では、画像を表示する液晶と、この液晶を背面
から照らす螢光灯との間に静電遮蔽用の金網を設け、低
温時にこの金網を加熱できるようにするものである。(Means for Solving Problems) In the present invention, a metal net for electrostatic shielding is provided between a liquid crystal that displays an image and a fluorescent lamp that illuminates the liquid crystal from the back, and the metal net can be heated at low temperature. To do so.
（作用） 螢光灯を静電遮断するので放電によって生ずる液晶表
示部への影響をほとんどなくすることができる。さらに
低温時はこの金網が蛍光灯を程よく暖めるため蛍光灯の
点灯が安定し、良好な画像が得られる。(Function) Since the fluorescent lamp is electrostatically shielded, the influence on the liquid crystal display portion caused by the discharge can be almost eliminated. Further, when the temperature is low, the wire net warms the fluorescent lamp moderately, so that the fluorescent lamp is lit stably and a good image is obtained.
（実施例） 以下、本発明の実施例につき図面を用いて説明する。(Example) Hereinafter, the Example of this invention is described using drawing.
第１図（ａ），（ｂ）に一実施例の表示部分の構造の
一部を切欠いた斜視図及び側断面図を示し、第２図にこ
の実施例の全体構成図を示す。第１図を第４図と比較す
れば明らかなように、液晶表示部及び拡散板と螢光灯の
間に金網が設けられている。1 (a) and 1 (b) show a perspective view and a side sectional view in which a part of the structure of a display portion of one embodiment is cut away, and FIG. 2 shows an overall configuration diagram of this embodiment. As is clear from comparison between FIG. 1 and FIG. 4, a wire mesh is provided between the liquid crystal display portion and the diffusion plate and the fluorescent lamp.
即ち、テレビ画像を表示する液晶表示部（11）は、液
晶（12）とこれを挟んで設けられる基板（13a），（13
b）と、これらの基板の内側に各々マトリクス状に設け
られる正面電極及び背面電極（図示せず）とから成る。
この液晶表示部（11）の裏面には従来と同様に光を拡散
する拡散板（14）が設けられる。その裏面には金網（1
5）が設けられており、更にその下（背面）に白色光を
発するＵ字状の螢光灯（16）が所定間隔をおいて設置さ
れる。この螢光灯（16）を覆う如く、内面に反射面を有
する反射板（17）が設けられる。したがって、螢光灯
（16）から発せられた白色光は反射板（17）により反射
されあるいは直接、金網を通り拡散板（14）によって拡
散され液晶表示部（11）の背面に照射される。That is, the liquid crystal display section (11) for displaying a television image includes a liquid crystal (12) and substrates (13a), (13) sandwiching the liquid crystal (12).
b) and a front electrode and a back electrode (not shown) provided inside each of these substrates in a matrix.
A diffuser plate (14) for diffusing light is provided on the back surface of the liquid crystal display (11) as in the conventional case. On the back side is a wire mesh (1
5) is provided, and a U-shaped fluorescent lamp (16) that emits white light is further installed below it (rear face) at a predetermined interval. A reflection plate (17) having a reflection surface on the inner surface is provided so as to cover the fluorescent lamp (16). Therefore, the white light emitted from the fluorescent lamp (16) is reflected by the reflecting plate (17) or directly passed through the wire mesh and diffused by the diffusing plate (14) to be applied to the back surface of the liquid crystal display section (11).
第１図及び第２図には示していないが、実際には外部
から入力されるTV信号に応じて液晶表示部（11）のマト
リクス状の電極に選択的に電圧を印加することによって
この表示面にTV画像を表示する。Although not shown in FIGS. 1 and 2, this display is actually performed by selectively applying a voltage to the matrix-shaped electrodes of the liquid crystal display section (11) according to a TV signal input from the outside. Display the TV image on the surface.
ところで、第２図に示すように金網（15）は螢光灯用
電源（21）の接地側端子に接続され接地されている。By the way, as shown in FIG. 2, the wire mesh (15) is connected to the ground side terminal of the fluorescent lamp power source (21) and grounded.
この実施例では更に金網（15）がスイッチ（SW）の一
方の接点に接続されており、スイッチ（SW）の他方の接
点は電池（22）に接続されている。スイッチ（SW）の開
閉は比較回路（23）の出力によりなされる。即ち螢光灯
（16）の表面温度を温度−電圧変換素子、例えばサーミ
スタ（24）によって検出し、その電圧と基準電圧Vsを比
較し、この電圧よりもサーミスタ（24）の電圧が高けれ
ば比較回路（23）は制御信号を送りスイッチ（SW）を閉
じる。すると電池（22）の電圧が金網（15）に印加され
る。結局、この液晶テレビの電源が入れられたとき螢光
灯（16）の表面温度が低いと金網（15）は適度に加熱さ
れ螢光灯（16）が温められることになる。In this embodiment, the wire mesh (15) is further connected to one contact of the switch (SW), and the other contact of the switch (SW) is connected to the battery (22). The switch (SW) is opened and closed by the output of the comparison circuit (23). That is, the surface temperature of the fluorescent lamp (16) is detected by a temperature-voltage conversion element, for example, the thermistor (24), the voltage is compared with the reference voltage Vs, and if the voltage of the thermistor (24) is higher than this voltage, the comparison is made. The circuit (23) sends a control signal to close the switch (SW). Then, the voltage of the battery (22) is applied to the wire mesh (15). After all, when the surface temperature of the fluorescent lamp (16) is low when the power of this liquid crystal television is turned on, the wire net (15) is appropriately heated and the fluorescent lamp (16) is warmed.
したがって、この実施例によれば静電遮蔽の為の金網
が低温時の加熱手段をも兼ねており、低温下の使用にお
いても螢光灯の点灯が容易であって、いろいろな環境の
下で常に良好な画像が得られる利点がある。Therefore, according to this embodiment, the wire net for electrostatic shielding also serves as the heating means at low temperature, and the fluorescent lamp can be easily turned on even when used at low temperature, and under various environments. There is an advantage that a good image can always be obtained.
尚、上記実施例では螢光灯を遮蔽する為の金網として
均一の網目のものを用いたが、特に第３図に示すように
螢光灯の近い部分が他の部分におけるよりも細かい金網
を用いれば静電遮蔽効果が更に有効となり更に良好な画
質が得られる。又、細かい網目の部分における光の透過
は少ないから液晶表示部への光の照射がより均一となる
利点もある。In the above embodiment, a uniform mesh was used as the wire mesh for shielding the fluorescent light. However, as shown in FIG. 3, a wire mesh close to the fluorescent light is finer than other areas. If used, the electrostatic shielding effect becomes more effective and a better image quality can be obtained. Further, since light transmission is small in the fine mesh portion, there is an advantage that the light irradiation to the liquid crystal display portion becomes more uniform.
本発明によれば、放電によって雑音源となり液晶へ悪
影響を与える螢光灯を静電遮蔽するので、表示画像に縞
模様を生ずる等画質劣化を生ぜず、また、低温下でも安
定した良好な画像が得られる。According to the present invention, the fluorescent lamp that electrostatically shields the liquid crystal, which becomes a noise source due to discharge, is not electrostatically shielded. Is obtained.
第１図は本発明一実施例の表示部分の構造図、第２図は
本発明一実施例の構成図、第３図は本発明における金網
の他の一例を示す図、第４図は従来の透過型液晶表示装
置の表示部分の構造図である。 11……液晶表示部、14……拡散板 15……金網、16……螢光灯 17……反射板、21……螢光灯用光源FIG. 1 is a structural diagram of a display portion of an embodiment of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a view showing another example of the wire netting of the present invention, and FIG. FIG. 3 is a structural diagram of a display portion of the transmissive liquid crystal display device of FIG. 11 …… Liquid crystal display, 14 …… Diffuser 15 …… Wire mesh, 16 …… Fluorescent lamp 17 …… Reflector, 21 …… Fluorescent light source
Claims (1)
生する光源と、 この光源と前記液晶表示部との間に設けられ前記光源に
近い部分が他の部分よりも目が細かく前記液晶表示部を
前記光源から静電遮蔽する金網と、 前記金網が低温時に加熱する加熱手段とを備えたことを
特徴とする透過型液晶表示装置。1. A liquid crystal display unit for displaying an image, a light source for generating electrostatic noise when the liquid crystal display unit is illuminated from the back side, and a light source provided between the light source and the liquid crystal display unit and close to the light source. A transmissive liquid crystal display device comprising: a wire net having a finer part than other parts and electrostatically shielding the liquid crystal display unit from the light source; and a heating unit heating the wire net at a low temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61234357A JPH0820632B2 (en) | 1986-10-03 | 1986-10-03 | Transmissive liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61234357A JPH0820632B2 (en) | 1986-10-03 | 1986-10-03 | Transmissive liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6389821A JPS6389821A (en) | 1988-04-20 |
| JPH0820632B2 true JPH0820632B2 (en) | 1996-03-04 |
Family
ID=16969735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61234357A Expired - Lifetime JPH0820632B2 (en) | 1986-10-03 | 1986-10-03 | Transmissive liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0820632B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101139A (en) * | 1989-03-09 | 1992-03-31 | Safe Computing, Inc. | Reducing video display radiation |
| JP2693849B2 (en) * | 1990-04-24 | 1997-12-24 | シャープ株式会社 | Flat light source device |
| JPH0482485A (en) * | 1990-07-25 | 1992-03-16 | Sony Corp | Back light for liquid crystal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5998475U (en) * | 1982-12-22 | 1984-07-03 | スタンレー電気株式会社 | Transmissive reflector with mesh heater |
| JPS6147058A (en) * | 1984-08-10 | 1986-03-07 | Sanyo Electric Co Ltd | Flat surface type fluorescent lamp |
| JPS6174952U (en) * | 1984-10-22 | 1986-05-21 | ||
| JPS61112567U (en) * | 1984-12-25 | 1986-07-16 |
-
1986
- 1986-10-03 JP JP61234357A patent/JPH0820632B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6389821A (en) | 1988-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2693849B2 (en) | Flat light source device | |
| CN100523917C (en) | Liquid crystal display device with electromagnetic wave screening element | |
| TW200402577A (en) | Liquid crystal display device having a noise shielding member | |
| NO894627D0 (en) | ELECTRO-OPTIC FLAT INSTRUCTIONS, SPECIFICALLY AN LCD SCREEN. | |
| US5214522A (en) | Liquid crystal display with back light and conductive diffuser | |
| JP4371687B2 (en) | Backlight device and liquid crystal display device | |
| JPH0820632B2 (en) | Transmissive liquid crystal display device | |
| KR20000011594A (en) | Surface light source device | |
| KR100308105B1 (en) | Backlight of Liquid Crystal Display Having Subsidiary Electro-Luminescence Lamp | |
| JP2003215581A (en) | Liquid crystal display device | |
| JP3666897B2 (en) | Backlight device and liquid crystal display device including the backlight device | |
| JPH0443907Y2 (en) | ||
| JP3287275B2 (en) | Liquid crystal display | |
| US20050269924A1 (en) | Backlight for liquid crystal display | |
| JPH0572531A (en) | Liquid crystal display device | |
| JPH0437718A (en) | Liquid crystal display device | |
| JPH02136829A (en) | Back-light structure for liquid crystal display device | |
| JP2530741Y2 (en) | Backlight device for liquid crystal display panel | |
| JPH1096891A (en) | Light source device | |
| KR100497617B1 (en) | Lamp assembly for LCD backlight | |
| JPS60501181A (en) | Passive LCD Display Lighting System | |
| JP3070668B2 (en) | Lighting equipment | |
| KR19990020492U (en) | Backlight unit grounding structure of liquid crystal module | |
| JPH0895041A (en) | Back light device and liquid crystal display device | |
| JPH09189909A (en) | Liquid crystal display device |