JPH04172493A - Liquid crystal display device protection circuit - Google Patents
Liquid crystal display device protection circuitInfo
- Publication number
- JPH04172493A JPH04172493A JP30200690A JP30200690A JPH04172493A JP H04172493 A JPH04172493 A JP H04172493A JP 30200690 A JP30200690 A JP 30200690A JP 30200690 A JP30200690 A JP 30200690A JP H04172493 A JPH04172493 A JP H04172493A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display device
- circuit
- protection circuit
- 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 37
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、液晶表示装置を備えた機器の映像信号有無判
別回路を用いた液晶表示装置保護回路に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display device protection circuit using a video signal presence/absence determination circuit for equipment equipped with a liquid crystal display device.
従来の技術
近年、液晶表示装置は表示機器の小型化に伴い、これま
でのＣＲＴ表示装置に代わり、利用されつつある。BACKGROUND OF THE INVENTION In recent years, as display devices have become smaller, liquid crystal display devices have been used in place of conventional CRT display devices.
しかし、従来の液晶表示装置は、構成部品の寿命が、Ｃ
ＲＴ表示装置と比較し短いにもかかわらず、保護回路を
備えていないのが現状である。However, in conventional liquid crystal display devices, the lifespan of component parts is limited to C.
Although it is shorter than an RT display device, it currently does not have a protection circuit.
ここで、上記の寿命の短い液晶表示装置の構成部品を次
に挙げる。Here, the components of the above-mentioned liquid crystal display device having a short life span are listed below.
■ 液晶を利用した表示機能部品
■ ■の機能を補助する為の光源部品
なお、液晶表示装置は上記（■）又は（■＋■）を含む
表示装置を指す。■ Display functional component using liquid crystal ■ Light source component to assist the function of (■) Note that the liquid crystal display device refers to a display device that includes the above (■) or (■+■).
従来の液晶表示装置の構成例を第３図に示す。An example of the configuration of a conventional liquid crystal display device is shown in FIG.
発明が解決しようとする課題
上記のような従来の構成では、映像信号が入力されない
場合でも液晶表示装置は動作しているため、■、■の寿
命の短い部品にとっては実際の使用時間を縮める結果と
なってしまうという課題を有していた。Problems to be Solved by the Invention In the conventional configuration as described above, the liquid crystal display device operates even when no video signal is input, which results in shortening the actual usage time for parts with short lifespans. The problem was that it became .
本発明は上記課題に鑑み、映像信号有無人力時に、液晶
表示装置を動作させないような構成にし、液晶表示装置
の消耗を防ぎ、併せて、機器として省消費電力化を実現
するようにした液晶表示装置保護回路である。In view of the above-mentioned problems, the present invention provides a liquid crystal display which has a structure in which the liquid crystal display device is not operated when a video signal is present or not, and which prevents wear and tear on the liquid crystal display device, and at the same time realizes power saving as a device. It is a device protection circuit.
課題を解決するための手段
上記課題を解決するために本発明の液晶表示装置保護回
路は、映像信号の入力の有無を判別する回路と、液晶表
示装置の動作を停止させる回路とを備えたものである。Means for Solving the Problems In order to solve the above problems, a liquid crystal display device protection circuit of the present invention includes a circuit for determining whether or not a video signal is input, and a circuit for stopping the operation of the liquid crystal display device. It is.
作用
本発明は上記にした構成によって、液晶表示保護回路が
、液晶表示装置に映像信号が入力されていないと判断し
た場合に、液晶表示装置の動作を停止するように働き、
これにより、寿命の短い上記■、■の部品の消耗を防ぎ
、併せて、液晶表皮装置を登載した機器の省消費電力化
も実現することも可能となる。According to the above-described configuration, the present invention operates to stop the operation of the liquid crystal display device when the liquid crystal display protection circuit determines that no video signal is input to the liquid crystal display device.
As a result, it is possible to prevent the wear and tear of the above-mentioned parts (1) and (3), which have a short lifespan, and at the same time, it is also possible to reduce the power consumption of equipment equipped with a liquid crystal skin device.
実施例
以下、本発明の実施例の液晶表示装置保護回路について
、ブロック図を参照にしながら説明する。EXAMPLE Hereinafter, a liquid crystal display device protection circuit according to an example of the present invention will be described with reference to a block diagram.
第１図は本発明の第１の実施例のブロック図を示すもの
である。第１図において、■は液晶を利用した表示機能
部品、■は表示機能部品■の機能を補助する為の光源部
品点線内が本発明の第１の実施例である。FIG. 1 shows a block diagram of a first embodiment of the present invention. In FIG. 1, ■ indicates a display function component using a liquid crystal, and ■ indicates a light source component for assisting the function of the display function component ■.The part shown within the dotted line is the first embodiment of the present invention.
以上のように構成された液晶表示装置保護回路について
、第１図を用いてその動作を説明する。The operation of the liquid crystal display device protection circuit configured as described above will be explained with reference to FIG.
まず、映像信号が入力されている場合、液晶表示回路は
、動作する。このとき、映像信号有無判別回路は映像有
りと判断して、表示回路の各回路の電源をＯＮにしてい
る。次に、映像信号がない場合は、映像信号有無判別回
路は映像なしと判断するため、表示回路の各回路への電
源供給をＯＦＦにし、表示装置の保護を行なうことがで
きる。First, when a video signal is input, the liquid crystal display circuit operates. At this time, the video signal presence/absence determination circuit determines that there is video, and turns on the power to each circuit of the display circuit. Next, if there is no video signal, the video signal presence/absence determining circuit determines that there is no video, so the power supply to each circuit of the display circuit can be turned off to protect the display device.
以下、本発明の第２の実施例について図面を参照しなが
ら説明する。A second embodiment of the present invention will be described below with reference to the drawings.
第２図は、本発明の第２の実施例のブロック図である。FIG. 2 is a block diagram of a second embodiment of the invention.
液晶表示装置主回路の構成は第１例と同じだが、新たに
タイマ一部を追加した構成になっている。The configuration of the main circuit of the liquid crystal display device is the same as in the first example, but a part of the timer is newly added.
以上のように構成された液晶表示装置保護回路について
、以下その動作を説明する。The operation of the liquid crystal display device protection circuit configured as described above will be described below.
第２の実施例は、タイマ一部を付加することにより、映
像信号がなくなってから、ある一定の時間が経過したら
、液晶表示動作を０ＦＦＬ表示装置の保護を行うことが
できる。これは、第１例の場合、映像信号が不安定の場
合、誤って、映像信号なしと判断してしまうことが考え
られるため、ある一定の時間映像信号がない場合、保護
回路を動作させるためのものである。In the second embodiment, by adding a part of a timer, the liquid crystal display operation can be performed to protect the 0FFL display device after a certain period of time has passed since the video signal is lost. In the case of the first example, if the video signal is unstable, it may be mistakenly determined that there is no video signal, so if there is no video signal for a certain period of time, the protection circuit will be activated. belongs to.
なお、第１の実施例では、電源系統のスイッチで保護動
作をさせたが、映像信号がない場合、図の■または■＋
■が動作しなくなることが本発明の本質である。In the first embodiment, the protective operation was performed using the switch in the power supply system, but if there is no video signal, ■ or ■+ in the figure
The essence of the present invention is that (2) no longer operates.
また、第２の実施例では、電源系統のスイッチで保護動
作をさせたが、映像信号がない場合、図の■または■＋
■が動作しなくなることが本発明の本質である。In addition, in the second embodiment, the protective operation was performed using the switch in the power supply system, but if there is no video signal,
The essence of the present invention is that (2) no longer operates.
発明の効果
以上のように本発明によれば、映像信号がない場合に、
液晶表示装置の表示を停止させることにより液晶表示装
置を保護し、実際の使用時間を伸ばすといった優れた効
果を得ることができる。Effects of the Invention As described above, according to the present invention, when there is no video signal,
By stopping the display on the liquid crystal display device, the excellent effect of protecting the liquid crystal display device and extending the actual usage time can be obtained.
第１図は本発明の第１の実施例の構成を示すブロック図
、第２図は本発明の第２の実施例の構成を示すブロック
図、第３図は従来の液晶表示装置の構成を示すブロック
図である。
１・・・・・・液晶表示機能部品、２・・・・・・光源
。
代理人の氏名 弁理士小蝦治明 ほか２名第 １ 図
第３図FIG. 1 is a block diagram showing the structure of a first embodiment of the present invention, FIG. 2 is a block diagram showing the structure of a second embodiment of the invention, and FIG. 3 is a block diagram showing the structure of a conventional liquid crystal display device. FIG. 1...Liquid crystal display functional parts, 2...Light source. Name of agent: Patent attorney Haruaki Koebi and two others Figure 1 Figure 3
Claims (1)
示を停止させる回路を有する液晶表示装置保護回路。A liquid crystal display device protection circuit comprising a liquid crystal display device and a circuit that stops displaying the display device when no video signal is input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30200690A JPH04172493A (en) | 1990-11-06 | 1990-11-06 | Liquid crystal display device protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30200690A JPH04172493A (en) | 1990-11-06 | 1990-11-06 | Liquid crystal display device protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04172493A true JPH04172493A (en) | 1992-06-19 |
Family
ID=17903752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30200690A Pending JPH04172493A (en) | 1990-11-06 | 1990-11-06 | Liquid crystal display device protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04172493A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961034B2 (en) | 2000-01-25 | 2005-11-01 | Nec Lcd Technologies, Ltd. | Liquid crystal display device for preventing and afterimage |
| KR100658067B1 (en) * | 2000-11-02 | 2006-12-15 | 비오이 하이디스 테크놀로지 주식회사 | Power supply circuit of liquid crystal display |
-
1990
- 1990-11-06 JP JP30200690A patent/JPH04172493A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961034B2 (en) | 2000-01-25 | 2005-11-01 | Nec Lcd Technologies, Ltd. | Liquid crystal display device for preventing and afterimage |
| KR100658067B1 (en) * | 2000-11-02 | 2006-12-15 | 비오이 하이디스 테크놀로지 주식회사 | Power supply circuit of liquid crystal display |
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