Method and apparatus for adjusting brightness of an LCD display

• Main Authors: CHUNG-MING LENG, YU-PING LING
• Format: Patent
• Language: English
• Published: 07.01.2004
• Edition: 7
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PHYSICS; SEALS

A method for adjusting the brightness of an LCD display has the steps of: (a) dividing an adjustable brightness range of the LCD display into three stages, a high brightness stage, a normal brightness stage and a low brightness stage, (b) determining which stage of said three stages has corresponded to a brightness adjust command, (c) adjusting luminance intensity of an LCD panel or luminance intensity of a lamp based on the brightness adjust command. An apparatus for performing the method has a microprocessor (10) to receive the brightness adjust command, a PWM unit (20) coupled to the microprocessor (10) to adjust the current intensity of the lamp, and a voltage level controller (40) coupled to the microprocessor (10) to adjust the voltage level applied on the LCD panel (50).