Dimming Control Method and Related Backlight Controller

Abstract

Dimming control method and associated backlight controller. The embodiment provides a dimming control method, including: providing a dimming status signal. When it is a first logic value, it indicates that at least one light-emitting element should be driven to emit light. When it is a second logic value, Indicates that the light-emitting element should not emit light; when the dimming status signal is the first logic value, a closed loop is provided and a power converter is used to power the light-emitting elements to provide the electrical energy required for the light-emitting element to emit light. and make a signal of the closed loop approximately a preset value; and, when the dimming status signal transitions to the second logic value, and the dimming status signal is located at a lighting time of no more than the first logic value When a preset minimum power supply time is exceeded, the power converter continues to supply power to the light-emitting element, so that a power supply time of the power converter is not shorter than the minimum power supply time.

Description

technical field [0001] The present invention generally relates to a dimming control method and a related backlight controller, in particular to a dimming control method and a backlight controller capable of avoiding flicker. Background technique [0002] Good luminous efficiency, compact component size, and long component life make light-emitting diodes (LEDs) widely used in lighting or backlight industries. For example, most of the backlight modules in computer or TV screens have been converted from traditional Cold Cathode Fluorescent Lamp (CCFL) modules to LED modules. [0003] When a general LED module is used as a backlight module, its control circuit generally includes two blocks. One is a power converter, which may be a switching power supply, to provide the driving voltage required by the LED; the other is a constant current controller, which controls the magnitude of the current flowing through the LED module. [0004] LED modules often need to have the function o...

AI Technical Summary

Problems solved by technology

If the light-emitting time under PWM dimming is shorter than the response time of the power converter, the power converter may not be able to provide enough power in a timely manner to maintain the driving voltage required by the LED module when the power converter is too late to respond. Causes unwelcome flickering that can be felt by the human eye

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