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
Cooler
Processing financial documents
Micromechanical component, device for beam deflection of monochromatic light, and spectrometer
Method and apparatus of communication using soft decision
Integrated disk driving module including a stepping motor integrally formed with a base unit
Trash bag retention device
Providing a feedback loop in a low latency serial interconnect architecture
  Randomly Featured Patents
Method for improved distribution of cooling air in an electric machine
Reversible polarity borehole seismic device for P and enhanced S-wave crosshole testing
Method and apparatus for alphanumeric data entry using a keypad
Warmer for baseball bats
Wagering game with bonus game triggered by linked terminal
Stimulation of neuron regeneration by secretory leukocyte protease inhibitor
Method and apparatus for fast determination of initial transversal equalizer coefficient values
Electronic musical instrument
Recording/reproducing apparatus with double-sided beam type probe
Compact optical system with turn and color mixing