JPH0296712A - Transmission type liquid crystal display device - Google Patents
Transmission type liquid crystal display deviceInfo
- Publication number
- JPH0296712A JPH0296712A JP63250125A JP25012588A JPH0296712A JP H0296712 A JPH0296712 A JP H0296712A JP 63250125 A JP63250125 A JP 63250125A JP 25012588 A JP25012588 A JP 25012588A JP H0296712 A JPH0296712 A JP H0296712A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- driving device
- liquid crystal
- crystal display
- source driving
- 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 16
- 230000005540 biological transmission Effects 0.000 title abstract description 4
- 230000007257 malfunction Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004804 winding Methods 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、光源付の透過型液晶表示装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a transmission type liquid crystal display device with a light source.
光源付の透過型液晶表示装置を搭載するラップトツブコ
ンピュータ、ワードプロセッサー等の小型化、薄型化に
より、光源駆動装置を液晶表示装置内に搭載したり、液
晶表示装置の近傍の狭い部分に実装する方法が知られて
いた。Due to the miniaturization and thinning of laptop computers, word processors, etc. that are equipped with a transmissive liquid crystal display device with a light source, there is a method of mounting the light source drive device inside the liquid crystal display device or in a narrow area near the liquid crystal display device. was known.
光源付の透過型液晶表示装置の光源駆動装置を、前述の
ように放熱があまり考慮されない場所に実装した時、光
源駆動装置の異常、たとえば光源駆動装置用ツノの短絡
や、光源駆動装置を（Ｒ成するトランスのレアショート
などによる光源駆動装置構成部品の発熱を放熱できず、
光源駆動装置のまわりのケースの変形や、光源駆動装置
からの発煙などがおこるという問題点を有している。そ
こで本発明は、この問題点を解決するもので、その目的
とするところは、光源駆動装置の異常発熱を抑えた透過
型液晶表示装置を提供するところにある。When the light source drive device of a transmissive liquid crystal display device with a light source is mounted in a place where heat dissipation is not taken into consideration as mentioned above, abnormalities in the light source drive device, such as a short circuit in the horns of the light source drive device, or the light source drive device ( The heat generated by the components of the light source drive device due to a rare short circuit in the transformer forming the R circuit cannot be dissipated.
This has problems such as deformation of the case surrounding the light source driving device and smoke generation from the light source driving device. SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object thereof is to provide a transmissive liquid crystal display device in which abnormal heat generation of a light source driving device is suppressed.
本発明の透過型液晶表示装置は、螢光ランプやＥＬ等の
光源と、該光源駆動装置を具備した透過型液晶表示装置
において、前記光源駆動装置に温度ヒユーズを付けるこ
とを特徴とする。A transmissive liquid crystal display device of the present invention is a transmissive liquid crystal display device equipped with a light source such as a fluorescent lamp or EL, and a light source driving device, and is characterized in that a temperature fuse is attached to the light source driving device.
本発明の上記構成によれば、光源駆動装置の異常による
発熱により温度ヒ五−ズが切断し、発煙、発火、ケース
の変形などを防ぐことができる。According to the above configuration of the present invention, the temperature fuse is cut due to heat generated due to an abnormality in the light source driving device, and smoke, fire, and deformation of the case can be prevented.
〔実 施 例１〕
第１図は本発明の一実施例における光源駆動装置の回路
図であって、発振回路に１石ブロッキング方式を用いて
いる。図中１はトランス、２はトランジスター、３は冷
陰極管、４は温度ヒユーズである。温度ヒユーズ４はト
ランジスター２の放熱のための放熱板に取り付けである
。[Embodiment 1] FIG. 1 is a circuit diagram of a light source driving device in an embodiment of the present invention, in which a single-block blocking method is used in the oscillation circuit. In the figure, 1 is a transformer, 2 is a transistor, 3 is a cold cathode tube, and 4 is a temperature fuse. The temperature fuse 4 is attached to a heat sink for dissipating heat from the transistor 2.
第２図は本発明一実施例における液晶表示装置の構造図
である。図中５は液晶表示素子、６は金属ケース、７は
プラスチックケース、８は光源駆動装置である。FIG. 2 is a structural diagram of a liquid crystal display device according to an embodiment of the present invention. In the figure, 5 is a liquid crystal display element, 6 is a metal case, 7 is a plastic case, and 8 is a light source driving device.
本実施例の光源駆動装置の仕様は、入力電圧１２Ｖ、発
振周波数３０ＫＨｚ、管電流９ｍＡである。The specifications of the light source driving device of this embodiment are an input voltage of 12 V, an oscillation frequency of 30 KHz, and a tube current of 9 mA.
光源駆動装置の異常の一例として、トランス２次巻線の
短絡が考えられる。原因としてはトランス内部のレアシ
ョートなどがあるが、第１図の温度ヒユーズ４を用いず
に意図的にレアショートを起こさせたところ、トランス
１の表面温度は２００℃近くになり、発煙がおこった。An example of an abnormality in the light source driving device is a short circuit in the secondary winding of the transformer. The cause may be a layer short inside the transformer, but when we intentionally caused a layer short without using temperature fuse 4 in Figure 1, the surface temperature of transformer 1 rose to nearly 200℃, causing smoke. Ta.
またトランジスター２も発熱し、最終的には発煙後破壊
した。Transistor 2 also generated heat and eventually broke down after emitting smoke.
その結果トランジスター２及びトランス１の発熱により
、第２図中のプラスチックケース７が変形した。As a result, the plastic case 7 shown in FIG. 2 was deformed due to the heat generated by the transistor 2 and transformer 1.
そこで１５０℃で回路を遮断する温度ヒユーズをトラン
ジスタ用放熱板にとり付けた後に、レアショートを起こ
させた結果、トランス、トランジスターの発煙が起こる
前に、温度ヒユーズが動作し、回路が遮断された。また
、ケースの変形も認められなかった。After attaching a temperature fuse that cuts off the circuit at 150 degrees Celsius to the transistor heat sink, a layer short circuit was caused, and as a result, the temperature fuse was activated and the circuit was cut off before the transformer and transistor could emit smoke. Furthermore, no deformation of the case was observed.
〔実 施 例２〕
実施例１における光源駆動装置の発振回路部に、第３図
に示す２石プッシュプル方式を用いた。本実施例では温
度ヒユーズ４はトランスに固定した。[Example 2] The two-stone push-pull system shown in FIG. 3 was used in the oscillation circuit section of the light source driving device in Example 1. In this embodiment, the temperature fuse 4 is fixed to the transformer.
実施例１と同様にトランスにレアショートを起こさせた
ところ、トランス、トランジスターの発煙が起こる前に
温度ヒユーズが動作することを確認した。When a layer short circuit was caused in the transformer in the same manner as in Example 1, it was confirmed that the temperature fuse was activated before the transformer and transistor smoked.
以上述べたように本発明によれば、光源材の透過型液晶
表示装置の光源駆動装置の異常動作による発煙、発火や
他部品の１ｍ（ｌｒなどを防ぐことができる。As described above, according to the present invention, it is possible to prevent smoke, ignition, and 1m (lr) of other components due to abnormal operation of the light source driving device of a transmission type liquid crystal display device as a light source material.
第１図は本発明の実施ｆｌＱ １における光源駆動装置
の回路図。
第２図は実施例１で述べた液晶表示装置の構造図。
第３図は実施例２の光源駆動装置の回路図。
８・・・光源駆動装置
以上
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴 木 喜三部（他１名）１・拳−ト
ランス
２・・・トランジスター
３・・・冷陰極管
４・・・温度ヒユーズ
５・・・液晶表示装置
６・・・金属ケース
７・・・プラスチックケース
プラスチヮクケースFIG. 1 is a circuit diagram of a light source driving device in implementation flQ1 of the present invention. FIG. 2 is a structural diagram of the liquid crystal display device described in Example 1. FIG. 3 is a circuit diagram of a light source driving device according to a second embodiment. 8... Light source drive device and above Applicant: Seiko Epson Co., Ltd. Agent Patent attorney: Kizobe Suzuki (1 other person) 1. Fist - Transformer 2... Transistor 3... Cold cathode tube 4... Temperature Fuse 5...Liquid crystal display device 6...Metal case 7...Plastic case Plastic case
Claims (1)
た透過型液晶表示装置において、前記光源駆動装置に温
度ヒューズを付けることを特徴とする透過型液晶表示装
置。1. A transmissive liquid crystal display device comprising a light source such as a fluorescent lamp or EL, and a light source driving device, wherein the light source driving device is provided with a thermal fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63250125A JPH0296712A (en) | 1988-10-04 | 1988-10-04 | Transmission type liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63250125A JPH0296712A (en) | 1988-10-04 | 1988-10-04 | Transmission type liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0296712A true JPH0296712A (en) | 1990-04-09 |
Family
ID=17203195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63250125A Pending JPH0296712A (en) | 1988-10-04 | 1988-10-04 | Transmission type liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0296712A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06289363A (en) * | 1993-04-01 | 1994-10-18 | Nec Corp | Back light |
| KR100671453B1 (en) * | 2005-02-17 | 2007-01-19 | 주식회사 인터파워 | Back light Inverter for drive of multi Cold-cathode tub Fluorescent lamp |
-
1988
- 1988-10-04 JP JP63250125A patent/JPH0296712A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06289363A (en) * | 1993-04-01 | 1994-10-18 | Nec Corp | Back light |
| KR100671453B1 (en) * | 2005-02-17 | 2007-01-19 | 주식회사 인터파워 | Back light Inverter for drive of multi Cold-cathode tub Fluorescent lamp |
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