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JPH0212293A - Display device - Google Patents

Display device

Info

Publication number
JPH0212293A
JPH0212293A JP16105088A JP16105088A JPH0212293A JP H0212293 A JPH0212293 A JP H0212293A JP 16105088 A JP16105088 A JP 16105088A JP 16105088 A JP16105088 A JP 16105088A JP H0212293 A JPH0212293 A JP H0212293A
Authority
JP
Japan
Prior art keywords
brightness
display
display device
display screen
external light
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
JP16105088A
Other languages
Japanese (ja)
Inventor
Takeshi Arakawa
武 荒川
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP16105088A priority Critical patent/JPH0212293A/en
Publication of JPH0212293A publication Critical patent/JPH0212293A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Computer Display Output (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE:To hold the display screen of the display device invariably in an easy-to-see state even if external light varies in brightness by adjusting the brightness on the display screen of the display device automatically according to the brightness of the external light. CONSTITUTION:An optical sensor 100 detects the brightness of the external light and its detection output is amplified to a prescribed level by an amplifier 102 and inputted to an A/D converter 104. The light signal which is digitized by the A/D converter 104 is inputted to a P-ROM 106 stored with a table indicating the relation between the brightness of the light signal and the brightness on the display screen of the display device and converted logarithmically so that the brightness of the external light matches the brightness of the display screen of the display device. This light signal is inputted to a brightness control part 108 and a control signal for adjusting the brightness of the display screen of a display part 110 to brightness corresponding to the logarithmically converted light signal is outputted to the display part 110. Consequently, the brightness on the display screen is adjusted according to the brightness of the external light and the display screen is held in the easy-to-see state.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は表示装置に係わり、特にショウウィンドウに設
置され、外光の明るさに応じて表示面の輝度を自動的に
制御する機能を備えた表示装置に関する。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display device, and particularly to a display device installed in a show window and equipped with a function to automatically control the brightness of a display surface according to the brightness of external light. The present invention relates to a display device.

〔従来の技術〕[Conventional technology]

従来のこの種の表示装置にあっては、表示面の輝度は外
光の明るさに応じて調整するように構成されていなかっ
た。すなわち、表示装置の表示面の輝度は一定の輝度に
固定されているか、または表示面に直射日光があたって
いる場合、直射日光があたらない場合、夜で周囲が暗い
場合のそれぞれに対応する三段階程度に制御されるのが
通常であった。
Conventional display devices of this type are not configured to adjust the brightness of the display surface in accordance with the brightness of external light. In other words, the brightness of the display screen of the display device is either fixed at a constant level, or has three brightness levels corresponding to when the display screen is exposed to direct sunlight, when there is no direct sunlight, and when the surroundings are dark at night. Normally, it was controlled in stages.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の表示装置では外光の明るさに対応して表
示面の輝度を制御することができないために、外光が最
も明るい時に見易いように表示面の輝度を調整しておく
と、外光が暗くなった時に表示面が明るすぎて見えに(
くなり、他方外光が暗い時に見易いように表示面の輝度
を調整しておくと、外光が明るくなった時に表示面が白
くなって見えなくなるという問題があった。
In the conventional display devices mentioned above, it is not possible to control the brightness of the display screen in response to the brightness of outside light, so adjusting the brightness of the display screen so that it is easy to see when the outside light is the brightest will improve the brightness of the outside light. The display surface is too bright to see when the light gets dark (
On the other hand, if the brightness of the display surface is adjusted so that it is easy to see when the outside light is dark, there is a problem that the display surface becomes white and becomes invisible when the outside light becomes bright.

本発明はこのような事情に謹みてなされたものであり、
外光の明るさに応じて表示面の輝度を自動的に調整する
ことができる表示装置を提供することにある。
The present invention has been devised in consideration of these circumstances.
An object of the present invention is to provide a display device that can automatically adjust the brightness of a display surface according to the brightness of external light.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は上記目的を達成するために、外光の明るさを検
出する光検出手段と、この光検出手段の出力信号をA−
D変換するA・D変換手段と、このA−D変換手段の出
力信号に基づいて表示面の輝度を制御する制御手段とを
含んで構成されることを特徴とするものである。
In order to achieve the above object, the present invention includes a light detection means for detecting the brightness of external light, and an output signal of the light detection means.
The device is characterized in that it includes an A/D conversion means for performing D conversion, and a control means for controlling the brightness of the display surface based on the output signal of the A/D conversion means.

本発明に係わる表示装置では外光の明るさに応じて表示
面の輝度が調整されるので常に表示面が見易い状態に維
持される。
In the display device according to the present invention, the brightness of the display surface is adjusted according to the brightness of external light, so that the display surface is always maintained in an easy-to-see state.

〔実施例〕〔Example〕

以下、本発明の実施例を図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第1図には表示装置が設置されているショウウィンドウ
の状態が示されている。同図において、ガラス20を通
して外光の明るさを検出する光センサ100がガラス2
0に近接して設けられ、この先センサ100は表示部を
有する表示装置本体10と接続されている。
FIG. 1 shows the state of a show window in which a display device is installed. In the figure, an optical sensor 100 that detects the brightness of external light through a glass 20 is connected to a glass 20.
0, and the sensor 100 is connected to a display device main body 10 having a display section.

第2図には本発明に係わる表示装置の一実施例の構成が
示されている。同図において、表示装置は外光の明るさ
を検出する光センサ100と、増幅器102と、A−D
変換器104と、対数変換を行うP−ROM l 06
と、表示部110の表示面の輝度を制御する輝度制御部
108と、表示部110とから構成されている。
FIG. 2 shows the configuration of an embodiment of a display device according to the present invention. In the figure, the display device includes an optical sensor 100 that detects the brightness of external light, an amplifier 102, and an A-D
Converter 104 and P-ROM l 06 that performs logarithmic conversion
, a brightness control unit 108 that controls the brightness of the display surface of the display unit 110 , and a display unit 110 .

上記構成において、外光の明るさが光センサ100によ
り検出され、その検出出力は増幅器100により所定の
レベルまで増幅されA−D変換器104に人力される。
In the above configuration, the brightness of external light is detected by the optical sensor 100, and the detected output is amplified to a predetermined level by the amplifier 100 and input to the A-D converter 104.

A−D変換器104でディジタル信号に変換された光信
号は外光の明るさと表示装置の表示面の輝度との関係を
示すテーブルが記憶されているP−ROM 106に入
力され、外光の明るさと表示装置の表示面の輝度とが整
合するように対数変換される。
The optical signal converted into a digital signal by the A-D converter 104 is input to the P-ROM 106 which stores a table showing the relationship between the brightness of external light and the brightness of the display surface of the display device. Logarithmic transformation is performed so that the brightness matches the brightness of the display surface of the display device.

この対数変換された光信号は輝度制御部108に入力さ
れ、この輝度制御部108は表示部110の表示面の輝
度が、対数変換された光信号に応じた輝度になるように
輝度調整を行うための制御信号が表示部110に出力さ
れる。
This logarithmically converted optical signal is input to the brightness control unit 108, and the brightness control unit 108 adjusts the brightness so that the brightness of the display surface of the display unit 110 corresponds to the logarithmically converted optical signal. A control signal for this is output to the display section 110.

この結果、表示部110の表示面は外光の明るさに応じ
て適当な輝度となるように調整される。
As a result, the display surface of the display unit 110 is adjusted to have an appropriate brightness depending on the brightness of external light.

〔発明の効果〕〔Effect of the invention〕

以上に説明したように本発明では外光の明るさに応じて
表示装置の表示面の輝度を自動的に調整するように構成
したので、外光の明るさが変化しても常に表示装置の表
示面が見易い状態に維持される。
As explained above, the present invention is configured to automatically adjust the brightness of the display surface of the display device according to the brightness of outside light, so even if the brightness of outside light changes, the display device will always The display surface is maintained in an easy-to-read state.

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

第1図は本発明に係わる表示装置の設置状態を示す説明
図、第2図は本発明に係わる表示装置の一実施例の’d
lt’ftを示すブロック図である。 lO・・・・・・表示!ffi、100・・・・・・光
センサ、102・・・・・・増幅器、104・・・・・
・A−D変換器、106・・・・・・P−ROM、10
8・・・・・・輝度制御部、110・・・・・・表示部
。 出 願 人     日本電気株式会社代 理 人  
   弁理士 山内梅雄ネ1図
FIG. 1 is an explanatory diagram showing the installation state of a display device according to the present invention, and FIG. 2 is an explanatory diagram showing an example of the display device according to the present invention.
FIG. 2 is a block diagram showing lt'ft. lO...Display! ffi, 100... optical sensor, 102... amplifier, 104...
・A-D converter, 106...P-ROM, 10
8...Brightness control unit, 110...Display unit. Applicant: NEC Corporation Agent
Patent attorney Umeone Yamauchi 1

Claims (1)

【特許請求の範囲】 外光の明るさを検出する光検出手段と、 この光検出手段の出力信号をアナログ・ディジタル変換
するA・D変換手段と、 このA・D変換手段の出力信号を対数変換する対数変換
手段と、 この対数変換手段の出力信号に基づいて表示面の輝度を
制御する制御手段とを含んで構成されることを特徴とす
る表示装置。
[Claims] A photodetection means for detecting the brightness of external light; A/D conversion means for converting the output signal of the photodetection means from analog to digital; and logarithmic conversion of the output signal of the A/D conversion means. 1. A display device comprising: a logarithmic conversion means for performing the conversion; and a control means for controlling the brightness of a display surface based on an output signal of the logarithm conversion means.
JP16105088A 1988-06-30 1988-06-30 Display device Pending JPH0212293A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16105088A JPH0212293A (en) 1988-06-30 1988-06-30 Display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16105088A JPH0212293A (en) 1988-06-30 1988-06-30 Display device

Publications (1)

Publication Number Publication Date
JPH0212293A true JPH0212293A (en) 1990-01-17

Family

ID=15727654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16105088A Pending JPH0212293A (en) 1988-06-30 1988-06-30 Display device

Country Status (1)

Country Link
JP (1) JPH0212293A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257674A (en) * 1988-11-14 1993-11-02 Yamaha Hatsudoki Kabushiki Kaisha Engine construction for vehicle
KR19990073764A (en) * 1998-03-03 1999-10-05 이종수 Monitor device with adjustable brightness
WO2005057539A1 (en) * 2003-12-13 2005-06-23 Samsung Electronics Co., Ltd. Display apparatus and conrol method thereof
JP2008165172A (en) * 2006-12-27 2008-07-17 Samsung Sdi Co Ltd Ambient light sensing circuit and flat panel display having ambient light sensing circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257674A (en) * 1988-11-14 1993-11-02 Yamaha Hatsudoki Kabushiki Kaisha Engine construction for vehicle
KR19990073764A (en) * 1998-03-03 1999-10-05 이종수 Monitor device with adjustable brightness
WO2005057539A1 (en) * 2003-12-13 2005-06-23 Samsung Electronics Co., Ltd. Display apparatus and conrol method thereof
JP2008165172A (en) * 2006-12-27 2008-07-17 Samsung Sdi Co Ltd Ambient light sensing circuit and flat panel display having ambient light sensing circuit

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