Inverter controller with automatic brightness adjustment circuitry
Assignee02Micro International Limited
InventorYung-Lin Lin
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Abstract
An inverter controller for an LCD panel display with automatic brightness adjustment circuitry is provided. In one exemplary embodiment, the controller includes a look-up table that receives a signal indicative of the ambient light around the LCD panel and generates a signal corresponding to desired panel brightness. The signal corresponding to the desired panel brightness is, in turn, used as a threshold signal in a conventional feedback inverter topology supplying power to lamps associated with the LCD panel. In another exemplary embodiment, a master controller is provided that includes a light sensor controller to poll a slave light sensor to generate a signal indicative of the ambient light around the LCD panel.
Claims5
A master/slave brightness controller for an LCD panel display, comprising:
- an optical sensor generating a signal indicative of ambient light around said LCD panel;
- a micro controller controlling said optical sensor to generate said signal indicative of ambient light around said LCD panel, said micro controller is also adapted to generate said signal indicative of ambient light around said LCD panel independently of a host system CPU;
- a look-up table receiving said signal indicative of ambient light around said LCD panel and adapted to generate a target panel brightness level signal based on said signal indicative of ambient light around said LCD panel;
- a low frequency PWM circuit capable of generating a burst mode signal having a pulse width based on said target panel brightness signal;
- and
- an inverter circuit adapted to control power delivered to said LCD panel based on, at least in pan, said burst mode signal;
- said inverter circuit is also adapted to control power delivered to said LCD panel independently of a host system CPU.
Dependencies are inferred from the claim text.