JPH05127635A - Automatic adjusting unit for display brightness - Google Patents

Automatic adjusting unit for display brightness

Info

Publication number
JPH05127635A
JPH05127635A JP3285054A JP28505491A JPH05127635A JP H05127635 A JPH05127635 A JP H05127635A JP 3285054 A JP3285054 A JP 3285054A JP 28505491 A JP28505491 A JP 28505491A JP H05127635 A JPH05127635 A JP H05127635A
Authority
JP
Japan
Prior art keywords
brightness
brightness level
pixels
display
gradation
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
JP3285054A
Other languages
Japanese (ja)
Inventor
Yukio Nagasawa
幸雄 長澤
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 JP3285054A priority Critical patent/JPH05127635A/en
Publication of JPH05127635A publication Critical patent/JPH05127635A/en
Pending legal-status Critical Current

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  • Controls And Circuits For Display Device (AREA)

Abstract

PURPOSE:To provide the automatic control unit for display brightness which holds the brightness on a screen constant at all times. CONSTITUTION:A counter part 3 inputs the contents of a video memory 1 through the intervention of a video output signal 10 and counts the number of picture elements of respective gradation colors from the output of a vertical synchronizing signal 12 to the output of a next vertical synchronizing signal 12. A brightness level determination part 4 inputs the numbers 13 of picture elements by the gradation colors from the counter part 3, selects a brightness level 14 predetermined corresponding to the respective gradation colors and their numbers of picture elements so as to decrease a brightness level when picture elements of bright gradation colors are large in number or increase the brightness level when small, and outputs a brightness level indication signal 15 to an amplifier 5 through a D/A converter 5. The amplifier 6 varies the brightness of a CRT display 7 according to the brightness level instruction signal 15.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は情報処理装置に関し、特
に階調付モノクロディスプレイに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus and, more particularly, to a gradation monochrome display.

【0002】[0002]

【従来の技術】従来、この種のディスプレイでは、オペ
レータが必要に応じて輝度ボリュームつまみを回転させ
て、画面の輝度を調節していた。
2. Description of the Related Art Conventionally, in this type of display, an operator rotates a brightness volume knob as necessary to adjust the brightness of the screen.

【0003】[0003]

【発明が解決しようとする課題】この従来のディスプレ
イ輝度調節機構は、輝度ボリュームつまみで輝度を調整
するようになっているので、階調付きディスプレイに表
示される階調色の割合(黒/暗い灰色/中程度の灰色/
明るい灰色/白)によっては画面が明る過ぎたりまたは
暗過ぎたりして、表示内容によってオペレータが輝度ボ
リュームつまみをまわすわずらわしさが発生したり、ま
たは明暗差により目が疲れるという欠点がある。最近、
画像データも多値のものが表示される傾向が増えてお
り、上記問題が発生し易い傾向にある。
Since this conventional display brightness adjusting mechanism is adapted to adjust the brightness by the brightness volume knob, the ratio of gradation colors displayed on the gradation display (black / dark). Gray / medium gray /
Depending on the light gray / white), the screen may be too bright or too dark, and the operator may have trouble to turn the brightness volume knob depending on the displayed contents, or the eyes may get tired due to the difference in brightness. Recently,
The tendency of displaying multi-valued image data is increasing, and the above problems tend to occur.

【0004】本発明の目的は、画面の輝度を常時一定に
保つディスプレイ輝度自動調節装置を提供することであ
る。
It is an object of the present invention to provide a display brightness automatic adjusting device for keeping the screen brightness constant at all times.

【0005】[0005]

【課題を解決するための手段】本発明のディスプレイ輝
度自動調節装置は、ビデオメモリの内容を入力し、各階
調色の画素数を垂直同期信号が出力されてから次の垂直
同期信号が出力されるまでの間カウントするカウンタ部
と、前記カウンタ部から、各階調色毎の画素数を入力
し、明るい階調色の画素が多いと、輝度レベルを下げる
ように、明るい階調色の画素が少ないと、輝度レベルを
上げるように、各階調色とその画素数に対応して予め決
められた輝度レベルを選択する輝度レベル決定部と、選
択された輝度レベルに前記ディスプレイの輝度を変更す
る手段を有している。
The automatic display brightness adjusting apparatus of the present invention inputs the contents of the video memory, outputs the vertical synchronizing signal for the number of pixels of each gradation color, and then outputs the next vertical synchronizing signal. The counter unit that counts up to the number of pixels of each gradation color is input from the counter unit, and when there are many pixels of the bright gradation color, the pixels of the bright gradation color are adjusted so as to reduce the brightness level. A brightness level determining unit that selects a brightness level determined in advance corresponding to each gradation color and the number of pixels thereof so as to raise the brightness level when the number is small, and a unit that changes the brightness of the display to the selected brightness level. have.

【0006】[0006]

【作用】階調付モノクロディスプレイ上の各階調色の画
素数をカウントし、各階調色の画素数に対応して予め決
められた輝度レベルを選択し、画面の輝度を調節(白や
明るい灰色画素の割合が大きい場合は輝度を下げ、黒や
暗い灰色画素の割合が大きい場合は輝度を上げる)する
ことにより、常時一定の輝度を保ち、眼の疲れを防止で
き、また輝度が過度に明るくなることが防止できること
により、ブラウン管の短寿命化を防ぐこともできる。
[Function] Counts the number of pixels of each gradation color on a gradation monochrome display, selects a predetermined brightness level corresponding to the number of pixels of each gradation color, and adjusts the screen brightness (white or light gray By decreasing the brightness when the ratio of pixels is large, and increasing the brightness when the ratio of black or dark gray pixels is large, you can always maintain a constant brightness, prevent eye fatigue, and make the brightness too bright. By preventing this, it is possible to prevent shortening the life of the cathode ray tube.

【0007】[0007]

【実施例】次に、本発明の実施例について図面を参照し
て説明する。
Embodiments of the present invention will now be described with reference to the drawings.

【0008】図1は本発明の一実施例のディスプレイ輝
度自動調節装置のブロック図、図2は図1のディスプレ
イ輝度自動調節装置を含むパソコンの外観図である。
FIG. 1 is a block diagram of a display brightness automatic adjusting apparatus according to an embodiment of the present invention, and FIG. 2 is an external view of a personal computer including the display brightness automatic adjusting apparatus of FIG.

【0009】ビデオメモリ1の中には、CRTディスプ
レイ7に表示される内容がビットマップに展開した形で
保持されており、このビデオメモリ1の内容がビデオ出
力信号10経由で順次読み出され、アンプ6へ出力さ
れ、ここでデジタル信号がアナログ信号へ変換され、輝
度レベル指示信号15によって指示された輝度レベルま
で増幅または減衰され、さらに輝度ボリュームつまみ1
6で輝度レベルを再調整後、CRTディスプレイ7へ出
力され表示される。この時、ビデオメモリ1の内容が、
各画素の階調色を表わし、4階調の場合 “00”………黒 “01”………濃い灰色(暗い灰色) “10”………薄い灰色(明るい灰色) “11”………白 である。
The contents displayed on the CRT display 7 are held in the video memory 1 in the form of being expanded into a bit map, and the contents of the video memory 1 are sequentially read out via the video output signal 10, The signal is output to the amplifier 6, where the digital signal is converted into an analog signal, amplified or attenuated to the brightness level instructed by the brightness level instructing signal 15, and further the brightness volume knob 1
The brightness level is readjusted at 6 and then output to the CRT display 7 for display. At this time, the contents of the video memory 1
Represents the gradation color of each pixel, and in the case of 4 gradations "00" ...... Black "01" ...... Dark gray (dark gray) "10" ...... Light gray (light gray) "11" ...... ... white.

【0010】本実施例は輝度レベルを自動調節するた
め、下記のブロックを有している。先ず、カウンタ部3
はビデオメモリ1の内容10を入力し、各階調色の画素
数をカウントし、カウント値13を輝度レベル決定部4
へ出力する。このカウントの開始/終了は、表示制御部
2からドットクロックタイミングとして与えられる垂直
同期信号12から次の垂直同期信号12までである。つ
まり、画面の左上隅の画素の表示を開始してから画面の
右下隅の画素を表示し終えるまでの時間である。輝度レ
ベル決定部4は、カウンタ部3から得られた各階調色の
画素数13に対応してあらかじめ決められた輝度レベル
14を選択し、D/Aコンバータ5経由でアンプ6へ出
力する。具体的には、明るい色の画素が多いと輝度レベ
ルを下げるよう、明るい色の画素が少ないと逆に輝度レ
ベルを上げるよう、アンプ6へ輝度レベル指示信号15
により指示する。
The present embodiment has the following blocks for automatically adjusting the brightness level. First, the counter unit 3
Inputs the content 10 of the video memory 1, counts the number of pixels of each gradation color, and outputs the count value 13 to the brightness level determination unit 4
Output to. The start / end of this counting is from the vertical synchronizing signal 12 given as the dot clock timing from the display control unit 2 to the next vertical synchronizing signal 12. That is, it is the time from the start of displaying the pixel in the upper left corner of the screen to the end of displaying the pixel in the lower right corner of the screen. The brightness level determination unit 4 selects a brightness level 14 determined in advance corresponding to the number of pixels 13 of each gradation color obtained from the counter unit 3, and outputs it to the amplifier 6 via the D / A converter 5. Specifically, the brightness level instruction signal 15 is sent to the amplifier 6 so as to lower the brightness level when there are many bright color pixels and to increase the brightness level when there are few bright color pixels.
To instruct.

【0011】なお、カウンタ部3、輝度レベル決定部
4、D/Aコンバータ5、アンプ6はディスプレイ輝度
自動調節装置を構成しており、これらはビデオメモリ
1、表示制御部2とともにパソコン制御部8に収容され
ている。
The counter unit 3, the brightness level determining unit 4, the D / A converter 5 and the amplifier 6 constitute a display brightness automatic adjusting device, and these are a personal computer control unit 8 together with the video memory 1 and the display control unit 2. It is housed in.

【0012】本発明は液晶ディスプレイにも適用でき
る。
The present invention can also be applied to a liquid crystal display.

【0013】[0013]

【発明の効果】以上説明したように本発明は、階調付モ
ノクロディスプレイ上の各階調色の画素数をカウント
し、各階調色の画素数に対応して予め決められた輝度レ
ベルを選択し、画面の輝度を調節(白や明るい灰色画素
の割合が大きい場合は輝度を下げ、黒や暗い灰色画素の
割合が大きい場合は輝度を上げる)することにより、常
時一定の輝度を保ち、眼の疲れを防止でき、また輝度が
過度に明るくなることが防止できることにより、ブラウ
ン管の短寿命化を防ぐ効果もある。
As described above, according to the present invention, the number of pixels of each gradation color on the gradation monochrome display is counted, and a predetermined brightness level is selected corresponding to the number of pixels of each gradation color. , By adjusting the screen brightness (decrease the brightness when the ratio of white or light gray pixels is large, increase the brightness when the ratio of black or dark gray pixels is large) Since it is possible to prevent fatigue and prevent the brightness from becoming excessively bright, it is possible to prevent the life of the cathode ray tube from being shortened.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例のディスプレイ輝度自動調節
装置のブロック図である。
FIG. 1 is a block diagram of a display brightness automatic adjustment device according to an embodiment of the present invention.

【図2】図1のディスプレイ輝度自動調節装置を含むパ
ソコンの外観図である。
2 is an external view of a personal computer including the display brightness automatic adjustment device of FIG.

【符号の説明】[Explanation of symbols]

1 ビデオメモリ 2 表示制御部 3 カウンタ部 4 輝度レベル決定部 5 D/Aコンバータ 6 アンプ 7 CRTディスプレイ 8 パソコン制御部 9 キーボード 10 ビデオ出力信号 11 画面表示ドットクロック信号 12 垂直同期信号 13 画素数 14 輝度レベル 15 輝度レベル指示信号 16 輝度ボリュームつまみ 17 アナログデータ 1 Video Memory 2 Display Control Section 3 Counter Section 4 Brightness Level Determining Section 5 D / A Converter 6 Amplifier 7 CRT Display 8 Personal Computer Control Section 9 Keyboard 10 Video Output Signal 11 Screen Display Dot Clock Signal 12 Vertical Sync Signal 13 Number of Pixels 14 Brightness Level 15 Brightness level instruction signal 16 Brightness volume knob 17 Analog data

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 階調付モノクロディスプレイにおいて、 ビデオメモリの内容を入力し、各階調色の画素数を垂直
同期信号が出力されてから次の垂直同期信号が出力され
るまでの間カウントするカウンタ部と、 前記カウンタ部から、各階調色毎の画素数を入力し、明
るい階調色の画素が多いと、輝度レベルを下げるよう
に、明るい階調色の画素が少ないと、輝度レベルを上げ
るように、各階調色とその画素数に対応して予め決めら
れた輝度レベルを選択する輝度レベル決定部と、 選択された輝度レベルに前記ディスプレイの輝度を変更
する手段とを有する、ディスプレイ輝度自動調節装置。
1. In a gradation monochrome display, a counter for inputting the contents of a video memory and counting the number of pixels of each gradation color from the output of a vertical synchronizing signal to the output of the next vertical synchronizing signal. Section and the counter section, the number of pixels for each gradation color is input, and when there are many bright gradation color pixels, the luminance level is lowered, and when there are few bright gradation color pixels, the luminance level is increased. As described above, the display brightness automatic determination includes a brightness level determination unit that selects a brightness level determined in advance corresponding to each gradation color and the number of pixels thereof, and a unit that changes the brightness of the display to the selected brightness level. Adjustment device.
JP3285054A 1991-10-30 1991-10-30 Automatic adjusting unit for display brightness Pending JPH05127635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3285054A JPH05127635A (en) 1991-10-30 1991-10-30 Automatic adjusting unit for display brightness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3285054A JPH05127635A (en) 1991-10-30 1991-10-30 Automatic adjusting unit for display brightness

Publications (1)

Publication Number Publication Date
JPH05127635A true JPH05127635A (en) 1993-05-25

Family

ID=17686568

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3285054A Pending JPH05127635A (en) 1991-10-30 1991-10-30 Automatic adjusting unit for display brightness

Country Status (1)

Country Link
JP (1) JPH05127635A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5636041A (en) * 1995-05-24 1997-06-03 Dell Usa, L.P. Technique for increasing the visibility of an LCD panel during warm-up thereof
GB2355841A (en) * 1999-01-20 2001-05-02 Nec Corp Display device with brightness control
US6400360B1 (en) 1994-07-05 2002-06-04 Semiconductor Energy Laboratory Co., Ltd. Information processing device
US6867757B1 (en) 1999-01-20 2005-03-15 Nec Corporation Display device, portable electronic device and method of controlling display device
US7071955B2 (en) * 2001-05-30 2006-07-04 Sharp Kabushiki Kaisha Color display device
JP2008523419A (en) * 2004-05-11 2008-07-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Method for processing image data

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6400360B1 (en) 1994-07-05 2002-06-04 Semiconductor Energy Laboratory Co., Ltd. Information processing device
US6697059B2 (en) 1994-07-05 2004-02-24 Semiconductor Energy Laboratory Co., Ltd. Information processing device
US5636041A (en) * 1995-05-24 1997-06-03 Dell Usa, L.P. Technique for increasing the visibility of an LCD panel during warm-up thereof
GB2355841A (en) * 1999-01-20 2001-05-02 Nec Corp Display device with brightness control
GB2355841B (en) * 1999-01-20 2001-10-31 Nec Corp Display device, portable electronic device and method of controlling display device
US6867757B1 (en) 1999-01-20 2005-03-15 Nec Corporation Display device, portable electronic device and method of controlling display device
US7071955B2 (en) * 2001-05-30 2006-07-04 Sharp Kabushiki Kaisha Color display device
JP2008523419A (en) * 2004-05-11 2008-07-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Method for processing image data

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