US5300945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual oscillating drive circuit for a display apparatus having improved pixel off-state operation
Assignee: Sharp Corp
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Filing: 1992-06-10
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Granted: 1994-04-05
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Expires: 2012-06-10
Abstract
Abstract A drive circuit for a display apparatus having a display section including a pixel, a switching element connected to the pixel and a scanning electrode connected to the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of the pixel, includes a circuit for applying a first oscillating voltage to the counter electrode, and for applying a second oscillating voltage having the same phase and the same amplitude as the first oscillating voltage to the scanning electrode during a period when the switching element is to be in off-state.
Inventors
- 👤 Takaaki Iemoto
- 👤 Koji Kumada
- 👤 Takashi Ohnishi
- 👤 Hideki Yakushigawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:24
CPC Classifications
G; G09; G09G; G09G1/00; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3674; G09G3/3677; G09G3/22; G09G3/30; G09G3/3648; G09G3/3696; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/0267; G09G2320/00; G09G2320/02; G09G2320/0219; G09G3/3614
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A drive circuit for a display apparatus having a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element through a gate electrode of the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel, said drive circuit comprising: a first means for applying a first oscillating voltage to said counter electrode; and a second means for applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; said second means applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage.
Claim 2
Dependent Claim
145 words
A drive circuit for a display apparatus having a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element through a gate electrode of the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel, said drive circuit comprising: a first means for applying a first oscillating voltage to said counter electrode; and a second means for applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; said second means applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage.
Claim 3
Dependent Claim
80 words
A drive circuit for a display apparatus according to claim 1, wherein said second means selectively applies said second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage, and wherein said second means selectively applies a fourth oscillating voltage having the same phase as said first oscillating voltage to said scanning electrode, depending on whether said switching element is to be in an on-state, and said first means and said second means are connected.
Claim 4
Dependent Claim
139 words
A display apparatus comprising: a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel; and a drive circuit for driving said display section, including a first means for applying a first oscillating voltage to said counter electrode, and a second means for applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; said second means applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage.
Claim 5
Dependent Claim
139 words
A display apparatus comprising: a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel; and a drive circuit for driving said display section, including a first means for applying a first oscillating voltage to said counter electrode, and a second means for applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; said second means applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage.
Claim 6
Dependent Claim
64 words
A display apparatus according to claim 3, wherein said second means selectively applies said second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage and applies a third voltage having the same phase as said first oscillating voltage to said scanning electrode, depending on whether said switching element is to be in an off-state or in an on-state.
Claim 7
Dependent Claim
17 words
A display apparatus according to claim 3, wherein said switching element is a thin film transistor (TFT).
Claim 8
Independent Claim
140 words
A method of driving a display apparatus having a display apparatus having a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element through a gate electrode of the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel, said method comprising the steps of: applying a first oscillating voltage to said counter electrode; applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; and applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage.
Claim 9
Independent Claim
140 words
A method of driving a display apparatus having a display apparatus having a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element through a gate electrode of the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel, said method comprising the steps of: applying a first oscillating voltage to said counter electrode; applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; and applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage.
Claim 10
Dependent Claim
169 words
A drive circuit for a display apparatus having a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element through a gate electrode of the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel, said drive circuit comprising: a first means for applying a first oscillating voltage to said counter electrode; and a second means for applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; said second means applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage, wherein the difference between said second oscillating voltage and said first oscillating voltage is small enough to secure an off-state of said switching element.
Claim 11
Dependent Claim
169 words
A drive circuit for a display apparatus having a display section including a pixel, a switching element connected to said pixel and a scanning electrode connected to said switching element through a gate electrode of the switching element, and a pixel electrode and a counter electrode being provided on opposite sides of said pixel, said drive circuit comprising: a first means for applying a first oscillating voltage to said counter electrode; and a second means for applying a second oscillating voltage having the same phase and the same amplitude as said first oscillating voltage to said scanning electrode during a period when said switching element is to be in an off-state; said second means applying a third voltage to said scanning electrode during a period when said switching element is to be in an on-state, said third voltage being larger than said second oscillating voltage, wherein the difference between said second oscillating voltage and said first oscillating voltage is small enough to secure an off-state of said switching element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |