Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-06-28
1999-01-19
Wu, Xiao
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 38, 345 50, 345205, 345211, G09G 336
Patent
active
058618619
ABSTRACT:
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.
REFERENCES:
patent: 4654649 (1987-03-01), Kojima
patent: 5529863 (1996-06-01), Swirbel et al.
patent: 5623277 (1997-04-01), Lippmann et al.
Boles Brian
Cooper Russell E.
Drake Rodney
Ellison Scott
Nolan James B.
Microchip Technology Incorporated
Wu Xiao
LandOfFree
Microcontroller chip with integrated LCD control module and swit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microcontroller chip with integrated LCD control module and swit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microcontroller chip with integrated LCD control module and swit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1250324