TWI256863B - Backlight control device - Google Patents

Backlight control device

Info

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
Application number
TW90130914A
Other languages
Chinese (zh)
Inventor
Shr-Fa Shiu
Original Assignee
Mitac Int 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 Mitac Int Corp filed Critical Mitac Int Corp
Priority to TW90130914A priority Critical patent/TWI256863B/en
Application granted granted Critical
Publication of TWI256863B publication Critical patent/TWI256863B/en

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.
TW90130914A 2001-12-13 2001-12-13 Backlight control device TWI256863B (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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