EP 0391654 A3 19910410 - A DRIVE CIRCUIT FOR DRIVING AN LCD APPARATUS
Title (en)
A DRIVE CIRCUIT FOR DRIVING AN LCD APPARATUS
Publication
Application
Priority
- JP 8552489 A 19890404
- JP 8552589 A 19890404
Abstract (en)
[origin: EP0391654A2] A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition is disclosed. The drive device comprises: a signal electrode drive circuit for amplitude-modulating an input digital video signal by performing digital-analog conversion, and supplying the resulting analog signal to one of the signal electrodes; a memory for storing the input digital video signal; a pulsewidth conversion circuit for converting the stored digital video signal into a pulse signal, the width of the pulse signal corresponding to the information contained in the stored digital video signal; a pulsewidth-amplitude conversion circuit for converting the pulse signal into an analog signal the amplitude of which corresponds to the pulsewidth of the pulse signal; and an output circuit for supplying a drive signal to one of the signal electrodes, in accordance with the analog signal.
IPC 1-7
IPC 8 full level
CPC (source: EP KR)
G09G 3/2011 (2013.01 - EP); G09G 3/36 (2013.01 - KR); G09G 3/3648 (2013.01 - EP); G09G 3/3688 (2013.01 - EP); G09G 3/3614 (2013.01 - EP); G09G 2310/0259 (2013.01 - EP); G09G 2310/027 (2013.01 - EP); G09G 2310/0283 (2013.01 - EP)
Citation (search report)
- [A] GB 2205191 A 19881130 - PHILIPS ELECTRONIC ASSOCIATED
- [A] EP 0254805 A2 19880203 - HOSIDEN ELECTRONICS CO [JP]
- [AP] GB 2212361 A 19890719 - CITIZEN WATCH CO LTD [JP]
- [A] GB 2162674 A 19860205 - CITIZEN WATCH CO LTD
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0391654 A2 19901010; EP 0391654 A3 19910410; EP 0391654 B1 19941102; DE 69013736 D1 19941208; DE 69013736 T2 19950504; KR 900016935 A 19901114; KR 930005376 B1 19930619
DOCDB simple family (application)
EP 90303539 A 19900403; DE 69013736 T 19900403; KR 900004630 A 19900404