Liquid crystal display device for display with gray levels
Abstract
A liquid crystal display device having an arrangement of a plurality of pixel display regions (82) each including a plurality of divided pixels (A-D), and being capable of effecting display with a large number of gray levels. Each of the divided pixels (A-D) is displayed individually and selectively with at least two gray levels. The liquid crystal device further includes pixel electrodes (31-36) for individually and selectively enabling the divided pixels (A-D), and a gray level setting circuit for controlling the sum of the areas of the enabled divided pixels (A-D), thereby setting the gray levels of the pixels. In this device, one pixel display region (82) includes n divided pixels (A-D) and if each pixel (A-D) can be displayed with m gray levels, the areas of the pixels (A-D) are set to form a geometric progression using m as a common ratio, whereby display with mn gray levels for one display region (82) can be effected with high precision.

Term
Term ended
Projected expiry passed 2 October 2009, 17 years ago.
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1 sheet
Sheet 1
Every citation, both ways
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| EP0236198A1 | Cites | European Patent Office (EPO) | A | Search report |
| EP0261898A2 | Cites | European Patent Office (EPO) | Y | Search report |
| EP0271960A2 | Cites | European Patent Office (EPO) | X | Search report |
4 priority claims, no other members on record
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 24880088 | Japan | – | |
| 24880088 | Japan | A | |
| 24880088 | – | – | – |
| JP19880248800 | – | – | – |
32 legal events, as 2 offices reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | Office | |
|---|---|---|---|
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Patent expired after termination of 20 yearsExpiredPE20 | PE20 | GB | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| European patent in force as of 2002-01-01IF02 | IF02 | GB | |
| Fr: translation filed ** decision concerning oppositionOppositionET3 | ET3 | EP | |
| Patent maintained in amended form27A | 27A | EP | |
| Designated contracting statesAK | AK | EP | |
| Patent maintained in amended formORIGINAL CODE: 0009272PUAH | PUAH | EP | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: PATENT MAINTAINED AS AMENDEDSTAA | STAA | EP | |
| Interlocutory decision in oppositionOppositionORIGINAL CODE: EPIDOS IDOPPLAW | PLAW | EP | |
| Interlocutory decision in oppositionOppositionORIGINAL CODE: EPIDOS IDOPPLAW | PLAW | EP | |
| Reply of patent proprietor to notice(s) of oppositionOppositionORIGINAL CODE: EPIDOS OBSOPLBF | PLBF | EP | |
| Reply of patent proprietor to notice(s) of oppositionOppositionORIGINAL CODE: EPIDOS OBSOPLBF | PLBF | EP | |
| Reply of patent proprietor to notice(s) of oppositionOppositionORIGINAL CODE: EPIDOS OBSOPLBF | PLBF | EP | |
| Examination of admissibility of oppositionOppositionORIGINAL CODE: EPIDOS OPEXPLAV | PLAV | EP | |
| Reply of patent proprietor to notice(s) of oppositionOppositionORIGINAL CODE: EPIDOS OBSOPLBF | PLBF | EP | |
| Examination of admissibility of oppositionOppositionORIGINAL CODE: EPIDOS OPEXPLAV | PLAV | EP | |
| Opposition filedOpposition26 | 26 | EP | |
| Opposition filedOppositionORIGINAL CODE: 0009260PLBI | PLBI | EP | |
| Unpublished change to opponent dataORIGINAL CODE: EPIDOS OPPOPLBQ | PLBQ | EP | |
| Fr: translation filedET | ET | EP | |
| Corresponds to:REF | REF | EP | |
| Designated contracting statesAK | AK | EP | |
| (expected) grantORIGINAL CODE: 0009210GRAA | GRAA | EP | |
| First examination report despatched17Q | 17Q | EP | |
| Request for examination filed17P | 17P | EP | |
| Designated contracting statesAK | AK | EP | |
| Search report despatchedORIGINAL CODE: 0009013PUAL | PUAL | EP | |
| Designated contracting statesAK | AK | EP | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI | EP |
Numbers
- Publication
- 0361981
- Publication, DOCDB
- 0361981
- Publication, EPODOC
- EP0361981
- Application
- 89310055
- Application, DOCDB
- 89310055
- Application, EPODOC
- EP19890310055
Titles3
- English
- Liquid crystal display device for display with grey levels
- German
- Flüssigkristall-Anzeigevorrichtung zur Anzeige mit Graupegeln
- French
- Dispositif d'affichage à cristal liquide pour affichage avec niveaux de gris
Classification
- CPC, 5
- G02F1/134336
- G02F2001/134345
- G09G3/2074
- G09G3/3607
- G09G3/364
- IPC, 5
- G02F1 133
- G02F1 1343
- G09F9 30
- G09G3 20
- G09G3 36
Designated states3
- Contracting states, 3
- Germany
- France
- United Kingdom