Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-01-13
1997-05-20
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345174, 198 18, G09G 336
Patent
active
056316666
ABSTRACT:
A detection and hold circuit outputs a reference signal having a level proportional to an x-coordinate detection pulse input from an X-coordinate signal amplifier. A delay element delays the reference signal. An adder adds the x-coordinate detection pulse from the X-coordinate signal amplifier and a delayed signal from the delay element. Comparators obtain a coordinate detection pulse making a detection signal from another detection and hold circuit for an LCD voltage inversion pulse serve as a reference signal. Thus noise following the x-coordinate detection pulse is removed to generate a coordinate detection pulse with a reference value corresponding to the level of the LCD voltage inversion pulse to allow a stable coordinate detection to be achieved. A correction signal generation circuit reads out correction data stored in an internal memory and transmits the data as a correction signal to a correction voltage generation circuit in an x-coordinate detection period when the segment electrode placed in the lower position is scanned. The correction voltage generation circuit generates a correction voltage for canceling a voltage induced at the common electrode placed in the upper position based on the input correction signal and a bias power source input from a DC power supply circuit.
REFERENCES:
patent: 4719457 (1988-01-01), Kitajima et al.
patent: 4839634 (1989-06-01), More et al.
patent: 4841290 (1989-06-01), Nakano et al.
patent: 4875036 (1989-10-01), Washizuka et al.
patent: 4988837 (1991-01-01), Murakami et al.
patent: 5162782 (1992-11-01), Yoshioka
patent: 5357266 (1994-10-01), Tagawa
patent: 5392058 (1995-02-01), Tagawa
patent: 5465103 (1995-11-01), Yoshioka
Kako Noritoshi
Okamura Kazunari
Tagawa Takao
Takahama Kengo
Conlin David G.
Daley, Jr. William J.
Fatahiyar Mike
Hjerpe Richard
Sharp Kabushiki Kaisha
LandOfFree
Display-integrated type tablet device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Display-integrated type tablet device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Display-integrated type tablet device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1727204