TWI256863B - Backlight control device - Google Patents
Backlight control deviceInfo
- Publication number
- TWI256863B TWI256863B TW90130914A TW90130914A TWI256863B TW I256863 B TWI256863 B TW I256863B TW 90130914 A TW90130914 A TW 90130914A TW 90130914 A TW90130914 A TW 90130914A TW I256863 B TWI256863 B TW I256863B
- Authority
- TW
- Taiwan
- Prior art keywords
- backlight
- pulse modulation
- phototransistor
- control
- circuit
- Prior art date
Links
Landscapes
- Liquid Crystal Display Device Control (AREA)
Abstract
Disclosed is a backlight control device for a liquid crystal display which has a backlight device. The backlight control device comprises a phototransistor for detecting background brightness, and a control circuit for generating a signal for controlling the backlight device in accordance with the phototransistor in order to allow the backlight device to perform brightness adjustment according to corresponding background brightness, in which the control circuit comprise a control voltage generation circuit coupled to the phototransistor for generating a control voltage according to induced photoelectric current of the photo detection device, a pulse modulation circuit for performing pulse modulation to modulation on clock signal according to the received control voltage and generating corresponding pulse modulation signal, and a backlight driving circuit coupled to the pulse modulation circuit for controlling the backlight device according to the pulse modulation signal so that the LCD brightness can be adjusted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW90130914A TWI256863B (en) | 2001-12-13 | 2001-12-13 | Backlight control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW90130914A TWI256863B (en) | 2001-12-13 | 2001-12-13 | Backlight control device |
Publications (1)
Publication Number | Publication Date |
---|---|
TWI256863B true TWI256863B (en) | 2006-06-11 |
Family
ID=37614805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW90130914A TWI256863B (en) | 2001-12-13 | 2001-12-13 | Backlight control device |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI256863B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI403218B (en) * | 2008-05-06 | 2013-07-21 | Univ Nat Taiwan Science Tech | Backlight module and circuit of cold cathode fluorescent lamp dimming |
CN112788809A (en) * | 2019-10-23 | 2021-05-11 | 致伸科技股份有限公司 | Light brightness adjusting device |
-
2001
- 2001-12-13 TW TW90130914A patent/TWI256863B/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI403218B (en) * | 2008-05-06 | 2013-07-21 | Univ Nat Taiwan Science Tech | Backlight module and circuit of cold cathode fluorescent lamp dimming |
CN112788809A (en) * | 2019-10-23 | 2021-05-11 | 致伸科技股份有限公司 | Light brightness adjusting device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |