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
pixels
brightness level
gradation color
number
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
Original Assignee
Nec Corp
日本電気株式会社
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, 日本電気株式会社 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

Links

Abstract

(57) [Abstract] [Purpose] To provide a display brightness automatic adjusting device which constantly maintains the screen brightness. [Structure] The counter unit 3 inputs the contents of the video memory 1 via a video output signal 10, and outputs the number of pixels of each gradation color from a vertical synchronization signal 12 to the output of the next vertical synchronization signal 12. Count for a while. Brightness level determination unit 4
Inputs the number of pixels 13 for each gradation color from the counter unit 3,
If there are many bright gradation color pixels, the brightness level is lowered, and if there are few bright gradation color pixels, the brightness level is raised, and a predetermined brightness level corresponding to each gradation color and its number of pixels. 14 is selected, and the brightness level instruction signal 15 is output to the amplifier 6 via the D / A converter 5. The amplifier 6 changes the brightness of the CRT display 7 based on the brightness level instruction signal 15.

Description

Detailed Description of the Invention

[0001]

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]

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]

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.

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]

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]

[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]

Embodiments of the present invention will now be described with reference to the drawings.

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.

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.

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.

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.

The present invention can also be applied to a liquid crystal display.

[0013]

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.

[Brief description of drawings]

FIG. 1 is a block diagram of a display brightness automatic adjustment device according to an embodiment of the present invention.

2 is an external view of a personal computer including the display brightness automatic adjustment device of FIG.

[Explanation of symbols]

 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)

[Claims]
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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