JPH0450821U - - Google Patents
Info
- Publication number
- JPH0450821U JPH0450821U JP9216290U JP9216290U JPH0450821U JP H0450821 U JPH0450821 U JP H0450821U JP 9216290 U JP9216290 U JP 9216290U JP 9216290 U JP9216290 U JP 9216290U JP H0450821 U JPH0450821 U JP H0450821U
- Authority
- JP
- Japan
- Prior art keywords
- pulse signal
- lcd
- synchronization
- detection output
- brightness
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Liquid Crystal Display Device Control (AREA)
Description
第１図はこの考案の一実施例のブロツク図、第
２図はパルス周期を示す波形図である。
１……駆動回路、２……ＬＣＤ、３，６……増
幅器、４……バツクライト用ＬＥＤ、５……フオ
トダイオード、７……サンプリングホールド回路
、８……反転増幅器。
FIG. 1 is a block diagram of an embodiment of this invention, and FIG. 2 is a waveform diagram showing the pulse period. 1...Drive circuit, 2...LCD, 3, 6...Amplifier, 4...Backlight LED, 5...Photodiode, 7...Sampling hold circuit, 8...Inverting amplifier.
Claims (1)
ルス駆動する駆動回路と、上記のパルス信号に同
期して点灯するバツクライト用照明器と、上記の
パルス信号の反転周期に同期して周囲の明るさを
検出する光検出器と、該検出出力に応じて上記バ
ツクライト用照明器の明るさを制御する制御回路
とを備えることを特徴とする表示装置。 An LCD, a drive circuit that pulse-drives the LCD in synchronization with a pulse signal, a backlight illuminator that lights up in synchronization with the above-mentioned pulse signal, and an ambient brightness that synchronizes with the inversion cycle of the above-mentioned pulse signal. What is claimed is: 1. A display device comprising: a photodetector that detects the detection output; and a control circuit that controls the brightness of the backlight illuminator according to the detection output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9216290U JPH0450821U (en) | 1990-08-31 | 1990-08-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9216290U JPH0450821U (en) | 1990-08-31 | 1990-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0450821U true JPH0450821U (en) | 1992-04-28 |
Family
ID=31828413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9216290U Pending JPH0450821U (en) | 1990-08-31 | 1990-08-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0450821U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003215534A (en) * | 2002-01-23 | 2003-07-30 | Seiko Epson Corp | Backlight control device for liquid crystal display |
| JP2007072243A (en) * | 2005-09-08 | 2007-03-22 | Sanyo Epson Imaging Devices Corp | Illuminance detecting method, luminance control method, electrooptical device, and electronic equipment |
-
1990
- 1990-08-31 JP JP9216290U patent/JPH0450821U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003215534A (en) * | 2002-01-23 | 2003-07-30 | Seiko Epson Corp | Backlight control device for liquid crystal display |
| JP2007072243A (en) * | 2005-09-08 | 2007-03-22 | Sanyo Epson Imaging Devices Corp | Illuminance detecting method, luminance control method, electrooptical device, and electronic equipment |