Patent EP0424958A2 successfully refreshed from Google Patents.
EP0424958A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal display apparatus having controlled power-off
Assignee: Canon Inc
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Filing: 1990-10-26
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Granted: —
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Expires: 2010-10-26
Abstract
Abstract A display apparatus includes a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines, a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, at least one voltage level being supplied to the scanning and to the data line driving means, a switching means for turning on or off an electrical connection between the driving voltage generating means to a power source for supplying or disconnecting power to the driving voltage generating means, and a control means for controlling the scanning line driving means and the data line driving means such that a scanning signal voltage is applied to a scanning line to scan the same while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that the one voltage level is supplied to the scanning line driving means and to the data line driving means after the switching means is turned off.
Inventors
- 👤 Akira Tsuboyama
- 👤 Katsuhiro Miyamoto
- 👤 Atsushi Mizutome
- 👤 Hideo Kanno
- 👤 Hiroshi Inoue
- 👤 Kazunori Katakura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:06
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3692; G09G3/3622; G09G3/3629; G09G3/3674; G09G3/3681; G09G3/3696; G09G2310/00; G09G2310/02; G09G2310/0243; G09G2310/0245; G09G2330/00; G09G2330/02; G09G2330/021
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
199 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning and data line driving means such that a scanning signal voltage is applied to a scanning line to scan the same while a data signal voltage corresponding to image data is applied to the data lines when the switching means is on, such that said same level voltage supplied to said scanning line and data line driving means is applied to said scanning lines and said data lines after said switching means is turned off.
Claim 2
Dependent Claim
199 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning and data line driving means such that a scanning signal voltage is applied to a scanning line to scan the same while a data signal voltage corresponding to image data is applied to the data lines when the switching means is on, such that said same level voltage supplied to said scanning line and data line driving means is applied to said scanning lines and said data lines after said switching means is turned off.
Claim 3
Dependent Claim
16 words
A display apparatus according to claim 1, wherein said display panel exhibits a the memory effect.
Claim 4
Dependent Claim
17 words
A display apparatus according to claim 1, wherein said display panel further comprises a ferroelectric liquid crystal.
Claim 5
Dependent Claim
234 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving the scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving the data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; d. a first control means for controlling said scanning and data line driving means such that a scanning signal voltage is applied to a scanning line to scan the same while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that said one level voltage supplied to said scanning and said data line driving means after said switching means is turned off; and e. a second control means for controlling said driving voltage generating means such that an output terminal of said same level voltage is connected to a grounded potential after said one level voltage is applied to said scanning and said data lines.
Claim 6
Dependent Claim
234 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving the scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving the data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; d. a first control means for controlling said scanning and data line driving means such that a scanning signal voltage is applied to a scanning line to scan the same while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that said one level voltage supplied to said scanning and said data line driving means after said switching means is turned off; and e. a second control means for controlling said driving voltage generating means such that an output terminal of said same level voltage is connected to a grounded potential after said one level voltage is applied to said scanning and said data lines.
Claim 7
Dependent Claim
15 words
A display apparatus according to claim 4, wherein said display panel exhibits a memory effect.
Claim 8
Dependent Claim
17 words
A display apparatus according to claim 4, wherein said display panel further comprises a ferroelectric liquid crystal.
Claim 9
Dependent Claim
209 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving the scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving the data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning and data line driving means such that a scanning signal voltage is applied to scan a scanning line while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that a voltage which is sufficient to erase the contents displayed on said display panel and then said one level voltage are supplied to said scanning line driving means and to said data line driving means after said switching means is turned off.
Claim 10
Dependent Claim
209 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving the scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving the data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning and data line driving means such that a scanning signal voltage is applied to scan a scanning line while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that a voltage which is sufficient to erase the contents displayed on said display panel and then said one level voltage are supplied to said scanning line driving means and to said data line driving means after said switching means is turned off.
Claim 11
Dependent Claim
15 words
A display apparatus according to claim 7, wherein said display panel exhibits a memory effect.
Claim 12
Dependent Claim
17 words
A display apparatus according to claim 7, wherein said display panel further comprises a ferroelectric liquid crystal.
Claim 13
Dependent Claim
253 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving the scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving the data lines, wherein at least one voltage is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; d. a first control means for controlling said scanning and said data line driving means such that a scanning signal voltage is applied to scan a scanning line while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that a voltage which is sufficient to erase the contents displayed on said display panel and then said one level voltage are supplied to said scanning line driving means and to said data line driving means after said switching means is turned off; and e. a second control means for controlling said driving voltage generating means such that an output terminal of said same level voltage is connected to a grounded potential after said one level voltage is applied to said scanning and said data lines.
Claim 14
Dependent Claim
253 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving the scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving the data lines, wherein at least one voltage is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; d. a first control means for controlling said scanning and said data line driving means such that a scanning signal voltage is applied to scan a scanning line while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that a voltage which is sufficient to erase the contents displayed on said display panel and then said one level voltage are supplied to said scanning line driving means and to said data line driving means after said switching means is turned off; and e. a second control means for controlling said driving voltage generating means such that an output terminal of said same level voltage is connected to a grounded potential after said one level voltage is applied to said scanning and said data lines.
Claim 15
Dependent Claim
15 words
A display apparatus according to claim 10, wherein said display panel exhibits a memory effect.
Claim 16
Dependent Claim
17 words
A display apparatus according to claim 10, wherein said display panel further comprises a ferroelectric liquid crystal.
Claim 17
Dependent Claim
213 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement formed of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning and said data line driving means such that a scanning signal voltage is applied to scan a scanning line and said one level voltage is applied to a non-selected scanning line as a scanning non-selection signal voltage while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, and such that said one level voltage is supplied to said scanning line driving means and to said data line driving means after said switching means is turned off.
Claim 18
Dependent Claim
213 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement formed of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning and said data line driving means such that a scanning signal voltage is applied to scan a scanning line and said one level voltage is applied to a non-selected scanning line as a scanning non-selection signal voltage while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, and such that said one level voltage is supplied to said scanning line driving means and to said data line driving means after said switching means is turned off.
Claim 19
Dependent Claim
15 words
A display apparatus according to claim 13, wherein said display panel exhibits a memory effect.
Claim 20
Dependent Claim
17 words
A display apparatus according to claim 13, wherein said display panel further comprises a ferroelectric liquid crystal.
Claim 21
Dependent Claim
259 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; d. a first control means for controlling said scanning line driving means and said data line driving means such that a scanning signal voltage is applied to scan a selected scanning line and said one level voltage is applied to a non-selected scanning line as a scanning non-selection signal voltage while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, and said one level voltage is supplied to said scanning line driving means and to said data line driving means after said switching means is turned off; and e. a second control means for controlling said driving voltage generating means such that an output terminal of said same level voltage is connected to a grounded potential after said same level voltage is applied to said scanning lines and to said data lines.
Claim 22
Dependent Claim
259 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, wherein at least one voltage level is supplied to both said scanning and said data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; d. a first control means for controlling said scanning line driving means and said data line driving means such that a scanning signal voltage is applied to scan a selected scanning line and said one level voltage is applied to a non-selected scanning line as a scanning non-selection signal voltage while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, and said one level voltage is supplied to said scanning line driving means and to said data line driving means after said switching means is turned off; and e. a second control means for controlling said driving voltage generating means such that an output terminal of said same level voltage is connected to a grounded potential after said same level voltage is applied to said scanning lines and to said data lines.
Claim 23
Dependent Claim
15 words
A display apparatus according to claim 16, wherein said display panel exhibits a memory effect.
Claim 24
Dependent Claim
17 words
A display apparatus according to claim 16, wherein said display panel further comprises a ferroelectric liquid crystal.
Claim 25
Dependent Claim
235 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages which are to be applied to data lines to a data line driving means for driving data lines, at least one voltage level is supplied to both said scanning and data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning line driving means and said data line driving means such that a scanning signal having one polarity pulse is applied to a selected scanning line to erase a writing state of pixels while a data signal corresponding to image data is applied to a data line when the switching means is on, such that a voltage which is sufficient to erase the contents displayed on said display panel and which is the same polarity pulse as said one polarity pulse is applied to the scanning lines after said switching means is turned off, wherein a voltage applied to the scanning non-selected electrodes is used as a reference of said polarity.
Claim 26
Dependent Claim
235 words
A display apparatus comprising: a. a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines; b. a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages which are to be applied to data lines to a data line driving means for driving data lines, at least one voltage level is supplied to both said scanning and data line driving means; c. a switching means for turning on or off an electrical connection between said driving voltage generating means to a power source for supplying or disconnecting power to said driving voltage generating means; and d. a control means for controlling said scanning line driving means and said data line driving means such that a scanning signal having one polarity pulse is applied to a selected scanning line to erase a writing state of pixels while a data signal corresponding to image data is applied to a data line when the switching means is on, such that a voltage which is sufficient to erase the contents displayed on said display panel and which is the same polarity pulse as said one polarity pulse is applied to the scanning lines after said switching means is turned off, wherein a voltage applied to the scanning non-selected electrodes is used as a reference of said polarity.
Claim 27
Dependent Claim
15 words
A display apparatus according to claim 19, wherein said display panel exhibits a memory effect.
Claim 28
Dependent Claim
17 words
A display apparatus according to claim 19, wherein said display panel further employs a ferroelectric liquid crystal.
Claim 29
Dependent Claim
15 words
A display device according to claim 19, wherein said erased state is a dark state.
References Cited (Backward Citations)
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