Patent EP0256879A2 successfully refreshed from Google Patents.
EP0256879A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Display device
Assignee: Canon Inc
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Filing: 1987-08-17
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Granted: —
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Expires: 2007-08-17
Abstract
Abstract A display device comprises a display panel (11) having a ferroelectric liquid crystal, information (DL) electrodes and scan electrodes (SL) for changing orientations of the ferroelectric liquid crystal in the display panel, a memory (19) for storing display data, a scan electrode driver (9) for supplying a signal to a scan electrode whose ferroelectric liquid crystal is to be reoriented in accordance with the data stored in the memory, and controller (CPU) for supplying data for designating the scan electrode whose ferroelectric liquid crystal is to be reoriented and data indicating an orientation status to the memory and the scan electrode driver.
Inventors
- 👤 Hiroshi Inoue
- 👤 Hideo Kanno
- 👤 Hiroshi Netsu
- 👤 Atsushi Mizutome
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 08:21
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; G09G3/3674; G09G2310/00; G09G2310/02; G09G2310/0243; G09G2310/0245; G09G2310/04; G09G2330/00; G09G2330/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
108 words
A display device comprising: a display panel including a ferroelectric liquid crystal; information electrodes and scan electrodes for changing orientations of the ferroelectric liquid crystal of said display panel; memory means for storing display data to correspond to each of said information electrodes; scan electrode drive means for applying a signal to a scan electrode whose ferroelectric liquid crystal is to be reoriented, in accordance with the data stored in said memory means; and control means for supplying data for designating the scan electrode whose ferroelectric liquid crystal is to be reoriented and data indicating an orientation state to said memory means and said scan electrode drive means.
Claim 2
Dependent Claim
108 words
A display device comprising: a display panel including a ferroelectric liquid crystal; information electrodes and scan electrodes for changing orientations of the ferroelectric liquid crystal of said display panel; memory means for storing display data to correspond to each of said information electrodes; scan electrode drive means for applying a signal to a scan electrode whose ferroelectric liquid crystal is to be reoriented, in accordance with the data stored in said memory means; and control means for supplying data for designating the scan electrode whose ferroelectric liquid crystal is to be reoriented and data indicating an orientation state to said memory means and said scan electrode drive means.
Claim 3
Dependent Claim
26 words
A display device according to Claim 1 further comprising an image memory for storing one screen of image data to be displayed on said display panel.
Claim 4
Dependent Claim
21 words
A display device according to Claim 1 further comprising a back light for illuminating the display screen of said display panel.
Claim 5
Dependent Claim
23 words
A display device according to Claim 2 wherein said control means includes detection means for detecting a data-modified area in said image memory.
Claim 6
Dependent Claim
73 words
A display device comprising: a display panel having a memory property; control means for controlling the display of said display panel; a power supply for supplying a power to said control means; a switch for turning on and off the supply of power from said power supply; and display content erase means for erasing display data stored in said display panel by said control means in response to the actuation of said switch.
Claim 7
Dependent Claim
73 words
A display device comprising: a display panel having a memory property; control means for controlling the display of said display panel; a power supply for supplying a power to said control means; a switch for turning on and off the supply of power from said power supply; and display content erase means for erasing display data stored in said display panel by said control means in response to the actuation of said switch.
Claim 8
Dependent Claim
23 words
A display device according to Claim 5 wherein said display content erase means is activated in response to the turn-on of said switch.
Claim 9
Dependent Claim
24 words
A display device according to Claim 5 wherein said display content erase means is activated in response to the turn off of said switch.
Claim 10
Dependent Claim
114 words
A display device comprising: parallelly arranged scan electrodes; parallelly arranged information electrodes arranged orthogonally to said sean electrodes; a plurality of scan electrode drive means provided one for each of blocks each including a plurality of said scan electrodes; selection means for selecting one of said scan electrode drive means; memory means for storing data to be displayed at the scan electrode corresponding to the scan electrode drive means selected by said selection means; and control means for supplying to said selection means the data for designating the block corresponding to the position whose display status is to be changed, and supplying to said memory means the data to be displayed at said position.
Claim 11
Dependent Claim
114 words
A display device comprising: parallelly arranged scan electrodes; parallelly arranged information electrodes arranged orthogonally to said sean electrodes; a plurality of scan electrode drive means provided one for each of blocks each including a plurality of said scan electrodes; selection means for selecting one of said scan electrode drive means; memory means for storing data to be displayed at the scan electrode corresponding to the scan electrode drive means selected by said selection means; and control means for supplying to said selection means the data for designating the block corresponding to the position whose display status is to be changed, and supplying to said memory means the data to be displayed at said position.
Claim 12
Dependent Claim
21 words
A display device according to Claim 8 further comprising ferroelectric liquid crystal provided between said scan electrodes and said information electrodes.
Claim 13
Dependent Claim
30 words
A display device according to Claim 8 wherein said scan electrode drive means selects the scan electrodes to be connected to said scan electrode drive means in a time-division fashion.
Claim 14
Dependent Claim
100 words
A display device comprising: a display panel having scan electrodes and information electrodes; an image memory for storing data to be displayed by said display panel; control means for changing the data in said image memory; check means for checking for each of data corresponding to the scan electrodes whether the data in said image memory has been changed by said control means; and display control means for selecting the scan electrode corresponding to the areas of said image memory in which the data has been changed, and supplying to said information electrodes the corresponding data in said image memory.
Claim 15
Dependent Claim
100 words
A display device comprising: a display panel having scan electrodes and information electrodes; an image memory for storing data to be displayed by said display panel; control means for changing the data in said image memory; check means for checking for each of data corresponding to the scan electrodes whether the data in said image memory has been changed by said control means; and display control means for selecting the scan electrode corresponding to the areas of said image memory in which the data has been changed, and supplying to said information electrodes the corresponding data in said image memory.
Claim 16
Dependent Claim
16 words
A display device according to Claim 11 wherein said display panel includes a ferroelectric liquid crystal.
Claim 17
Dependent Claim
21 words
A display device according to Claim 11 further comprising a back light for illuminating a display screen of said display panel.
Claim 18
Dependent Claim
37 words
A display device according to Claim 11 further comprising scan electrode drive means for selecting one of said scan electrodes and applying a signal thereto, and information electrode drive means for applying signals to said information electrodes.
Claim 19
Dependent Claim
119 words
A display device comprising: a display panel having scan electrodes and information electrodes; image data output means for supplying image data to be displayed on said display panel as data for selecting one of said scan electrodes and corresponding image data in a time-division fashion; display drive means for selecting one of said scan electrodes in accordance with the data supplied from said image data output means and supplying signals to said information electrodes; and synchronization signal generation means for requesting to said image data output means to send the data after said display drive means has sent the data signal to said display panel in order to synchronize said display drive means with said image data output means.
Claim 20
Dependent Claim
119 words
A display device comprising: a display panel having scan electrodes and information electrodes; image data output means for supplying image data to be displayed on said display panel as data for selecting one of said scan electrodes and corresponding image data in a time-division fashion; display drive means for selecting one of said scan electrodes in accordance with the data supplied from said image data output means and supplying signals to said information electrodes; and synchronization signal generation means for requesting to said image data output means to send the data after said display drive means has sent the data signal to said display panel in order to synchronize said display drive means with said image data output means.
Claim 21
Dependent Claim
16 words
A display device according to Claim 15 wherein said display panel has a ferroelectric liquid crystal.
Claim 22
Dependent Claim
21 words
A display device according to Claim 15 further comprising a back light for illuminating a display screen of said display panel.
Claim 23
Dependent Claim
26 words
A display device according to Claim 15 further comprising image data memory means for storing image data to be sent from said image data output means.
References Cited (Backward Citations)
No citation records indexed.
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