Resources Contact Us Home
Microcontroller chip with integrated LCD control module and switched capacitor driver circuit

Image Number 3 for United States Patent #5861861.

Apparatus for providing multiple of discrete voltage levels to drive a liquid crystal display (LCD) from an LCD module on board a microcontroller chip includes a charge pump with a switched-capacitor that develops the discrete voltages as multiples of the value of a base voltage that remains substantially without change irrespective of change in the supply voltage. A switched-capacitor charging circuit selectively charges a capacitor to produce successive additive charges individually retrievable from the capacitor. An LCD drive selectively transmits the discrete voltage levels to activate the LCD according to status of an external system under the control of the microcontroller. Voltage losses that may occur during the switched-capacitor charging are compensated to maintain the levels of the discrete voltages free of decay. Compensation is achieved by overcharging the capacitor by an amount substantially equivalent to the amount of voltage loss on the capacitor, using active feedback obtained from monitoring the charge on the capacitor.

  Recently Added Patents
Image-capturing device and projection automatic calibration method of projection device
Wire catalyst for hydrogenation/dehydrogenation reaction and manufacturing method therefor
Performance apparatus and electronic musical instrument
Method and system for reduction of decoding complexity in a communication system
Information processing apparatus and display control method
Leg stretching device
Modular microscope construction
  Randomly Featured Patents
Protective rib and lower back pads with release mechanisms
Method of recovering oil from oil-bearing vegetable matter
Document scoring based on document content update
Computer interface
UPS cabinet and method of assembly
Naval electrical power cable and method of installing the same
Plasma treatment method
Method of releasing communication between at least two communication devices
Production process of plastic parts by reaction injection moulding, and related head device
Shift redundancy circuit, method for controlling shift redundancy circuit, and semiconductor memory device