Invention Grant
- Patent Title: Apparatus and method of employing combined switching and PWM dimming signals to control brightness of cold cathode fluorescent lamps used to backlight liquid crystal displays
- Patent Title (中): 采用组合开关和PWM调光信号来控制用于背光液晶显示器的冷阴极荧光灯的亮度的装置和方法
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Application No.: US10927755Application Date: 2004-08-27
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Publication No.: US07835164B2Publication Date: 2010-11-16
- Inventor: Robert L. Lyle, Jr.
- Applicant: Robert L. Lyle, Jr.
- Applicant Address: US CA Milpitas
- Assignee: Intersil Americas Inc.
- Current Assignee: Intersil Americas Inc.
- Current Assignee Address: US CA Milpitas
- Agency: Fogg & Powers LLC
- Main IPC: H02M3/335
- IPC: H02M3/335 ; H02M5/42
Abstract:
An AC power supply system modulates a high frequency switching signal with a pulse width modulation (PWM) signal to produce a composite signal. The duty cycle of the PWM component of the composite signal is used to control the brightness of a cold cathode fluorescent lamp for backlighting a liquid crystal display.
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