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
Pharmaceutical powder compositions
Refuelable battery-powered electric vehicle
FET device having ultra-low on-resistance and low gate charge
System and method for customized prompting
Heat retaining device
Power device and method of packaging same
Computer system for routing package deliveries
  Randomly Featured Patents
Camera guidance system
Apparatus and methods for use in concentration of gas and particle-laden gas flows
Composite friction assembly
Device for testing digital circuits using built-in logic block observers (BILBO's)
Content delivery system for dynamically and optimally relocates contents to archive server, edge servers and terminal storage devices based on users' viewing tendency
High-alloy cold work die steel
Digital FM modulator
Skin friendly antiperspirant composition and method of making
Buckle
Shears