Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Automobile body
Reactor core of liquid metal cooled reactor
Method of preparing MgB.sub.2 superconducting wire and the MgB.sub.2 superconducting wire prepared thereby
Retransmission and retransmission request in data communication systems
Phosphonate compounds
Heat stable variants of plant adenosine diphosphate glucose pyrophosphorylase small subunit
Poloxamer foamable pharmaceutical compositions with active agents and/or therapeutic cells and uses
  Randomly Featured Patents
Processing seismic data
Sensor structure with L-shaped spring legs
Hydraulic damper with oil lock mechanism
Method and apparatus for computing SIR of time varying signals in a wireless communication system
Seat frame for automobile seats
Rotatable cam limit switch with variable timing and dwell
Burial casket
Method of producing .alpha.,.beta.-unsaturated carboxylic acid compounds
Device and method for detaching coating skins from processed meat products
Process for producing a decorative printed packaging material