Digital control system for lcd backlights
OwnerJorge Sanchezinventor
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OwnerJorge Sanchezinventor
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The present invention provides an apparatus and a method for digital control of a backlight system in an LCD display. More specifically, the system utilizes a control system in embedded firmware and a mixed signal micro controller unit (MCU) to allow servo digital control of the operation of the backlight system. The MCU provides multiple input and output ports. The ports operate digital and analog signals, which connect a processor to the backlight system and allow the processor to operate the functions of the inverter and the lamps. The embedded firmware control implements digital servo functions and several algorithms used to precisely and automatically set lamp operation, control individual lamps, compensate for aging, perform diagnostics, optimize power consumption and automate manufacturing tests.
1-2. (canceled)
A method of current control for multiple luminent devices comprising:
The method of claim 1 wherein the luminent devices are cold cathode fluorescent lamps.
The method of claim 1 wherein the luminent devices are light emitting diodes.
The method of claim 1 wherein the current control signals are pulse width modulated control signals.
The method of claim 1 wherein the step of adjusting an operating current includes changing the impedance path of the luminent devices.
The method of claim 1 wherein the step of adjusting an operating current is the step of adjusting an operating current applied to each luminent device through a single inverter in accord with the current control signals generated by the micro controller unit.
The method of claim 1 wherein the micro controller unit contains software for performing diagnostic functions.
The method of claim 1 wherein the micro controller unit contains software for performing calibration functions.
An apparatus for current control of multiple luminent devices comprising:
An apparatus for current control of multiple luminent devices comprising:
Dependencies are inferred from the claim text.