JPH0420924A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPH0420924A
JPH0420924A JP2125684A JP12568490A JPH0420924A JP H0420924 A JPH0420924 A JP H0420924A JP 2125684 A JP2125684 A JP 2125684A JP 12568490 A JP12568490 A JP 12568490A JP H0420924 A JPH0420924 A JP H0420924A
Authority
JP
Japan
Prior art keywords
liquid crystal
display device
crystal display
backlight
section
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
Application number
JP2125684A
Other languages
Japanese (ja)
Inventor
Shigenori Nishizawa
西沢 茂典
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2125684A priority Critical patent/JPH0420924A/en
Publication of JPH0420924A publication Critical patent/JPH0420924A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To automatically adjust the luminance of a back light part by providing a power source part for back light, which adjusts the voltage which is applied to the back light part and changes the luminance, on the transmission side of the liquid crystal screen of a liquid crystal display device. CONSTITUTION:A power source part 4 for back light which adjusts the voltage applied to a back light part 3 to change the luminance is provided on the transmission side of a liquid crystal screen 1 of the liquid crystal display device. A reception light quantity detecting part 2 is provided in the vicinity of the liquid crystal screen 1, and the power source part 4 for back light is controlled based on a reception light quantity detection signal S obtained by this detecting part 2. The lightness on the front side of the liquid crystal display device is detected to automatically adjust the luminance of the back light part 3 in this manner, thereby preventing the back light part 3 from increasing the brightness regardless of a high brightness of the front side of the liquid crystal display device to shorten the life.

Description

【発明の詳細な説明】 〔概要〕 この発明は、ラップトツブ型のコンピュータやワードプ
ロセッサなどに応用されているバックライト付の液晶デ
ィスプレイ装置に関し、液晶ディスプレイ装置の前面側
の明るさを検出して、バックライト部の輝度を自動的に
調整することによって、液晶ディスプレイ装置の前面側
が十分明るいにもかかわらず、バックライト部の輝度を
上げてバックライト部の寿命を縮めることがないように
することを目的とし、 液晶ディスプレイ装置の液晶画面を透過した側に設けた
、バックライト部に印加し輝度を変化させる電圧を調整
するバックライト用電源部を設けるとともに、液晶画面
の近傍に、受光量検出部を設け、この受光量検出部で得
られた受光量検出信号に基づいて、前記バックライト用
電源部を制御するようにしたこと特徴とするとするもの
である。
[Detailed Description of the Invention] [Summary] The present invention relates to a liquid crystal display device with a backlight, which is applied to laptop computers, word processors, etc. By automatically adjusting the brightness of the light section, the purpose is to avoid shortening the life of the backlight section by increasing the brightness of the backlight section even though the front side of the liquid crystal display device is sufficiently bright. A backlight power source is provided on the side of the liquid crystal display device that adjusts the voltage that is applied to the backlight to change the brightness, and a received light amount detection unit is provided near the liquid crystal screen. and the backlight power source section is controlled based on the received light amount detection signal obtained by the received light amount detection section.

〔産業上の利用分野〕[Industrial application field]

この発明は、ラップトツブ型のコンピュータやワードプ
ロセッサなどに応用されているバックライト付の液晶デ
ィスプレイ装置に関するものである。
The present invention relates to a backlit liquid crystal display device that is applied to laptop computers, word processors, and the like.

〔従来の技術〕[Conventional technology]

近年のラップトツブ型のコンピュータやワードプロセッ
サなどに応用されている液晶ディスプレイ装置は、液晶
ディスプレイ装置の前面側が暗くても画面表示が見られ
るように、バックライト付の液晶ディスプレイ装置が用
いられるようになっている。
In recent years, liquid crystal display devices used in laptop computers and word processors have come to be equipped with a backlight so that the screen display can be seen even if the front side of the device is dark. There is.

前記バックライト付の液晶ディスプレイ装置は、そのバ
ックライト部の寿命が比較的に短く、その輝度が徐々に
低下する傾向にある。
In the liquid crystal display device with a backlight, the life of the backlight portion thereof is relatively short, and its brightness tends to gradually decrease.

そこで、バックライト部の延命対策として、従来、バッ
クライト部の輝度調整スイッチや輝度調整つまみが取付
けられており、使用者が液晶ディスプレイ装置の前面側
の明るさに応じて、前記輝度調整スイッチや輝度調整つ
まみを操作して輝度を調整し、バックライト部の延命を
図ることができるようになっている。
Therefore, as a measure to prolong the life of the backlight section, a brightness adjustment switch and a brightness adjustment knob have conventionally been installed on the backlight section. You can adjust the brightness by operating the brightness adjustment knob to extend the life of the backlight section.

〔発明が解決しようとする課題〕 ところが、このような手段では、使用者が液晶ディスプ
レイ装置の前面側の明るさに応じて、意識的に前記バッ
クライト部の輝度調整スイッチや輝度調整つまみを操作
しなければならず、往々にしてその調整操作を忘れてし
まう、といった問題があった。
[Problem to be Solved by the Invention] However, with such means, the user must consciously operate the brightness adjustment switch or brightness adjustment knob of the backlight section depending on the brightness on the front side of the liquid crystal display device. However, there was a problem that the adjustment operation was often forgotten.

液晶ディスプレイ装置はもともとその前面からの光りの
透過を利用して画面表示を行っており、したがって、こ
の発明は、液晶ディスプレイ装置の前面側が十分明るけ
ればバックライト部は必要がないことに着目して、従来
の課題を解消するためになされたものであり、液晶ディ
スプレイ装置の前面側の明るさを検出して、その検出信
号に基づいてバックライト部の輝度を自動的に調整する
ことによって、液晶ディスプレイ装置の前面側が十分明
るいにもかかわらず、バックライト部の輝度を上げてそ
の寿命を縮めることがないようにすることを目的とした
ものである。
Originally, a liquid crystal display device displays a screen by utilizing the transmission of light from the front side of the device. Therefore, this invention focuses on the fact that if the front side of the liquid crystal display device is sufficiently bright, there is no need for a backlight section. , which was developed to solve the problems of the conventional liquid crystal display device, detects the brightness of the front side of the liquid crystal display device and automatically adjusts the brightness of the backlight section based on the detection signal. The purpose of this is to prevent shortening the lifespan of the backlight section by increasing the brightness of the backlight section even though the front side of the display device is sufficiently bright.

(tJIBを解決するための手段〕 この発明は、前記のようなWINを解決するため、第1
回の原理説明図に示すように、液晶ディスプレイ装置の
液晶画面1を透過した側に設けた、バックライト部3に
印加し輝度を変化させる電圧を調整するバックライト用
電源部4を設けるとともに、液晶西面1の近傍に、受光
量検出部2を設け、この受光量検出部2で得られた受光
量検出信号Sに基づいて、前記バックライト用電源部4
を制御するようにしたこと特徴とする液晶ディスプレイ
装置としたものである。
(Means for solving tJIB) In order to solve the above-mentioned WIN, the present invention provides the first
As shown in the principle explanatory diagram of 2, a backlight power supply unit 4 is provided on the side of the liquid crystal display device through which the liquid crystal screen 1 is transmitted, and which adjusts the voltage applied to the backlight unit 3 to change the brightness. A received light amount detection section 2 is provided in the vicinity of the liquid crystal west surface 1, and based on the received light amount detection signal S obtained by the received light amount detection section 2, the backlight power supply section 4
This is a liquid crystal display device characterized in that it is configured to control.

〔作用〕[Effect]

この発明のような液晶ディスプレイ装置にすると、液晶
ディスプレイ装置の前面側の明るさを受光量検出部2が
検出して、この検出信号Sに基づいて、バックライト用
電源部4を制御し、バックライト部3に印加する電圧を
調整して、バックライト部3の輝度を自動的に調整する
ことによって、液晶ディスプレイ装置の前面側が十分明
るいにもかかわらず、バックライト部3の輝度を上げて
バンクライト部3の寿命を縮めるようなことがなくなる
In the liquid crystal display device according to the present invention, the received light amount detection unit 2 detects the brightness on the front side of the liquid crystal display device, and based on this detection signal S, the backlight power supply unit 4 is controlled. By adjusting the voltage applied to the light section 3 and automatically adjusting the brightness of the backlight section 3, the brightness of the backlight section 3 is increased and the brightness of the backlight section 3 is increased even though the front side of the liquid crystal display device is sufficiently bright. This eliminates the possibility of shortening the life of the light section 3.

〔実施例〕〔Example〕

以下、この発明の液晶ディスプレイ装置の実施例を第2
図乃至第4図に基づいて詳細に説明する。
Hereinafter, a second embodiment of the liquid crystal display device of the present invention will be described.
This will be explained in detail based on FIGS. 4 to 4.

第2図はこの発明の液晶ディスプレイ装置を備えた、ラ
ップトツブ型のコンピュータやワードプロセッサの斜視
図、第3図は液晶ディスプレイ装置の前面側の明るさを
検出する受光量検出部を示す図、第4図は液晶ディスプ
レイ装置のバンクライト部の輝度の制御系統図であり、
1は液晶ディスプレイ装置の液晶画面、2はこの液晶画
面1を透過した側(1面)に設けた受光量検出部、3は
前記液晶画面1を透過した側(裏面)に設けたバツクラ
イト部、4はこのバックライト部3に印加する電圧を調
整するバックライト用電源部であり、このバックライト
用電源部4を、前記受光量検出部2の受光量検出信号S
に基づいて、ラップトツブ型のコンピュータやワードプ
ロセッサが本来有しているプロセッサ5を介して制御し
、前記バックライト部3に印加する電圧を調整して、バ
ックライト部3の輝度を液晶画面1の前面側の明るさに
応じて自動的に調整することができる。
FIG. 2 is a perspective view of a laptop-type computer or word processor equipped with the liquid crystal display device of the present invention, FIG. The figure is a control system diagram for the brightness of the bank light section of a liquid crystal display device.
1 is a liquid crystal screen of a liquid crystal display device; 2 is a received light amount detection unit provided on the side (first side) through which the liquid crystal screen 1 passes; 3 is a backlight unit provided on the side (back side) through which the liquid crystal screen 1 is transmitted; Reference numeral 4 denotes a backlight power supply unit that adjusts the voltage applied to the backlight unit 3, and this backlight power supply unit 4 is connected to the received light amount detection signal S of the received light amount detection unit 2.
Based on this, the voltage applied to the backlight section 3 is controlled via the processor 5 originally included in a laptop computer or a word processor, and the brightness of the backlight section 3 is adjusted to the level in front of the liquid crystal screen 1. It can be automatically adjusted according to the side brightness.

このようにすることにより、液晶ディスプレイ装置の前
面側が十分明るいにもかかわらず、バックライト部3の
輝度を上げてバックライト部3の寿命を縮めることがな
くなる。
By doing this, even though the front side of the liquid crystal display device is sufficiently bright, the brightness of the backlight section 3 will not be increased and the life of the backlight section 3 will not be shortened.

なお、前記実施例においては、受光量検出部2を液晶画
面1を透過した側(裏面)に設けたが、その他、図示し
ないが液晶画面1の前面側の近傍に設けることも可能で
ある。
In the above embodiment, the received light amount detection unit 2 was provided on the side through which the liquid crystal screen 1 passes (back side), but it may also be provided near the front side of the liquid crystal screen 1, although not shown.

〔発明の効果〕〔Effect of the invention〕

この発明は、以上説明したように、液晶ディスプレイ装
置の液晶画面を透過した側に設けた、バッタライト部に
印加し輝度を変化させる電圧を調整するバックライト用
電源部を設けるとともに、液晶画面の近傍に、受光量検
出部を設け、この受光量検出部で得られた受光量検出信
号Sに基づいて、前記バックライト用電源部を制御する
ようにしたこと特徴とする液晶ディスプレイ装置とした
ので、液晶ディスプレイ装置の前面側の明るさを検出し
て、バックライト部の輝度を自動的に調整することによ
って、液晶ディスプレイ装置の前面側が十分明るいにも
かかわらず、バックライト部の輝度を上げてバックライ
ト部の寿命を縮めることがなくなる。
As described above, the present invention provides a backlight power supply section provided on the side of the liquid crystal display device through which the liquid crystal screen passes through, which adjusts the voltage applied to the butterfly light section to change the brightness, and also The liquid crystal display device is characterized in that a received light amount detection section is provided nearby, and the backlight power supply section is controlled based on the received light amount detection signal S obtained by the received light amount detection section. By detecting the brightness on the front side of the LCD device and automatically adjusting the brightness of the backlight section, it is possible to increase the brightness of the backlight section even though the front side of the LCD device is sufficiently bright. This prevents the lifespan of the backlight section from being shortened.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の液晶ディスプレイ装置の原理説明図
、第2図乃至第4図はこの発明の液晶ディスプレイ装置
の実施例を示すもので、第2図はこの発明の液晶ディス
プレイ装置を備えた、ラップトツブ型のコンピュータや
ワードプロセッサの斜視図、第3図は液晶ディスプレイ
装置の前面側の明るさを検出する受光量検出部を示す図
、第4図は液晶ディスプレイ装置のバンクライト部の輝
度の制御系統図である。 1・・・液晶画面 2・・・受光量検出部 3・・・バックライト部 4・・・バックライト用電源部 5・・・プロセッサ この発明の液晶ディスプレイ装置の原理説明図第1図 この発明の液晶ディスプレイ装置を備えたラップトツブ
パソコンの斜視図第2図 第3図 2受光量検出部 液晶ディスプレイ装置のバックライト部の輝度の制御系
!第4図
FIG. 1 is a diagram explaining the principle of the liquid crystal display device of this invention, FIGS. 2 to 4 show examples of the liquid crystal display device of this invention, and FIG. 2 is a diagram showing the principle of the liquid crystal display device of this invention. , a perspective view of a laptop-type computer or word processor, Figure 3 is a diagram showing the received light amount detection section that detects the brightness on the front side of the liquid crystal display device, and Figure 4 is a diagram showing the control of the brightness of the bank light section of the liquid crystal display device. It is a system diagram. 1...Liquid crystal screen 2...Light receiving amount detection section 3...Backlight section 4...Backlight power supply section 5...Processor Diagram illustrating the principle of the liquid crystal display device of this invention Fig. 1 This invention A perspective view of a laptop computer equipped with a liquid crystal display device. Fig. 2. Fig. 3. 2. Received light amount detection section Brightness control system of the backlight section of the liquid crystal display device! Figure 4

Claims (2)

【特許請求の範囲】[Claims] (1)、液晶ディスプレイ装置の液晶画面(1)を透過
した側に設けた、バックライト部(3)に印加し輝度を
変化させる電圧を調整するバックライト用電源部(4)
を設けるとともに、液晶画面(1)の近傍に、受光量検
出部(2)を設け、この受光量検出部(2)で得られた
受光量検出信号Sに基づいて、前記バックライト用電源
部(4)を制御するようにしたこと特徴とする液晶ディ
スプレイ装置。
(1) A backlight power supply unit (4) that adjusts the voltage applied to the backlight unit (3) to change the brightness, which is provided on the side that passes through the liquid crystal screen (1) of the liquid crystal display device.
In addition, a received light amount detection section (2) is provided near the liquid crystal screen (1), and based on the received light amount detection signal S obtained by the received light amount detection section (2), the backlight power supply section A liquid crystal display device characterized by controlling (4).
(2)、バックライト付の液晶ディスプレイ装置におい
て、液晶ディスプレイ装置の液晶画面(1)を透過した
側に、受光量検出部(2)を設けたことを特徴とする請
求項(1)に記載の液晶ディスプレイ装置。
(2) In the liquid crystal display device with a backlight, the received light amount detection unit (2) is provided on the side of the liquid crystal display device that passes through the liquid crystal screen (1). LCD display device.
JP2125684A 1990-05-16 1990-05-16 Liquid crystal display device Pending JPH0420924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2125684A JPH0420924A (en) 1990-05-16 1990-05-16 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2125684A JPH0420924A (en) 1990-05-16 1990-05-16 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH0420924A true JPH0420924A (en) 1992-01-24

Family

ID=14916121

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2125684A Pending JPH0420924A (en) 1990-05-16 1990-05-16 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPH0420924A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363223A (en) * 1991-11-28 1994-11-08 Shaye Communications Limited Illumination of displays with control which switches illuminator in response to changes in the display
US5406305A (en) * 1993-01-19 1995-04-11 Matsushita Electric Industrial Co., Ltd. Display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363223A (en) * 1991-11-28 1994-11-08 Shaye Communications Limited Illumination of displays with control which switches illuminator in response to changes in the display
US5406305A (en) * 1993-01-19 1995-04-11 Matsushita Electric Industrial Co., Ltd. Display device

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