US5627557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display apparatus
Assignee: Sharp Corp
•
Filing: 1993-08-18
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Granted: 1997-05-06
•
Expires: 2013-08-18
Abstract
Abstract A display apparatus according to this invention includes a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; and a buffer amplifier for supplying the electric charge to the pixel capacitance in accordance with the voltage of the holding capacitance. Another display apparatus of this invention includes a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a first holding capacitance provided to each of the pixels in order to hold the pixel data; a display changing circuit which is controlled to be turned on/off by a display changing signal; a second holding capacitance which is supplied with the electric charge by the first holding capacitance via the display changing circuit; and a buffer amplifier for supplying the electric charge to the pixel capacitance in accordance with the voltage of the second holding capacitance.
Inventors
- 👤 Akira Yamaguchi
- 👤 Yutaka Ishii
- 👤 Yoshitaka Yamamoto
- 👤 Tomoaki Toichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:05
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G3/3618; G09G3/3659; G09G2300/00; G09G2300/08; G09G2300/0809; G09G2300/0814; G09G2300/0823; G09G2300/0842; G09G2300/0852; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2310/0243; G09G2310/0251; G09G2320/00; G09G2320/02; G09G2320/0204; G09G2320/0247; G09G3/3614
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
218 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the holding capacitance, wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to pixel capacitance in accordance with a voltage of the holding capacitance; a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges pass through the charging load means via the load; and a charging load control means for connecting the charging load means in parallel with the pixel capacitance during a charge supply period including at least a predetermined period from a start of supplying positive and negative electric charges based on a new pixel data from the bidirectional amplifying means to the pixel capacitance, and for cutting off the charging load means from the pixel capacitance during any period except for the charge supply period.
Claim 2
Dependent Claim
218 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the holding capacitance, wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to pixel capacitance in accordance with a voltage of the holding capacitance; a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges pass through the charging load means via the load; and a charging load control means for connecting the charging load means in parallel with the pixel capacitance during a charge supply period including at least a predetermined period from a start of supplying positive and negative electric charges based on a new pixel data from the bidirectional amplifying means to the pixel capacitance, and for cutting off the charging load means from the pixel capacitance during any period except for the charge supply period.
Claim 3
Dependent Claim
31 words
A display apparatus according to claim 1 further comprising a responsive recovery switching means for repeatedly applying positive and negative voltages alternately to the pixel capacitance by a response recovery signal.
Claim 4
Dependent Claim
48 words
A display apparatus according to claim 1 further comprising a means connected between a common line and a ground line, both of which are connected to the buffer amplifying means, for preventing a current flowing between the common line and the ground line through the buffer amplifying means.
Claim 5
Dependent Claim
35 words
A display apparatus according to claim 1, wherein all transistors used in an area where the plurality of the pixels are formed are of one kind selected from the group consisting of P-channel and N-channel.
Claim 6
Dependent Claim
137 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a first holding capacitance provided to each of the pixels to hold the pixel data; a display changing means which is controlled to be turned on/off by a display changing signal; a second holding capacitance which is supplied with the electric charge by the first holding capacitance via the display changing means; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the second holding capacitance, and wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to the pixel capacitance in accordance with a voltage of the second holding capacitance.
Claim 7
Dependent Claim
137 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a first holding capacitance provided to each of the pixels to hold the pixel data; a display changing means which is controlled to be turned on/off by a display changing signal; a second holding capacitance which is supplied with the electric charge by the first holding capacitance via the display changing means; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the second holding capacitance, and wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to the pixel capacitance in accordance with a voltage of the second holding capacitance.
Claim 8
Dependent Claim
57 words
A display apparatus according to claim 5 further comprising a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges passes through the charging load means via the load.
Claim 9
Dependent Claim
83 words
A display apparatus according to claim 6 further comprising a charging load control means for connecting the charging load means in parallel with the pixel capacitance during a charge supply period including at least a predetermined period from a start of supplying positive and negative electric charges based on a new pixel data from the bidirectional amplifying means to the pixel capacitance, and for cutting off the charging load means from the pixel capacitance during any period except for the charge supply period.
Claim 10
Dependent Claim
42 words
A display apparatus according to claim 5 further comprising a pixel data selecting means provided between a switching element and a data line for supplying the pixel data, the switching element being connected between the first holding capacitance and the data line.
Claim 11
Dependent Claim
40 words
A display apparatus according to claim 5 further comprising a refresh switching means which is controlled to be turned on/off by a refresh signal, wherein the pixel capacitance is connected to a power supply for discharging via the refresh means.
Claim 12
Dependent Claim
31 words
A display apparatus according to claim 5 further comprising a responsive recovery switching means for repeatedly applying positive and negative voltages alternately to the pixel capacitance by a response recovery signal.
Claim 13
Dependent Claim
48 words
A display apparatus according to claim 5 further comprising a means connected between a common line and a ground line, both of which are connected to the buffer amplifying means, for preventing a current flowing between the common line and the ground line through the buffer amplifying means.
Claim 14
Dependent Claim
26 words
A display apparatus according to claim 5, wherein a capacitance of the second holding capacitance is sufficiently smaller than a capacity of the first holding capacitance.
Claim 15
Dependent Claim
25 words
A display apparatus according to claim 5 further comprising a second buffer amplifying means connected between the first holding capacitance and the second holding capacitance.
Claim 16
Dependent Claim
35 words
A display apparatus according to claim 5, wherein all transistors used in an area where the plurality of the pixels are formed are of one kind selected from the group consisting of P-channel and N-channel.
Claim 17
Dependent Claim
170 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the holding capacitance, wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to pixel capacitance in accordance with a voltage of the holding capacitance; and a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges pass through the charging load means via the load, and wherein the charging load means includes a P-channel transistor and an N-channel transistor, which are controlled by signals whose polarities are different from each other.
Claim 18
Dependent Claim
170 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the holding capacitance, wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to pixel capacitance in accordance with a voltage of the holding capacitance; and a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges pass through the charging load means via the load, and wherein the charging load means includes a P-channel transistor and an N-channel transistor, which are controlled by signals whose polarities are different from each other.
Claim 19
Dependent Claim
82 words
A display apparatus according to claim 15 further comprising a charging load control means for connecting the charging load means in parallel with the pixel capacitance during a charge supply period including at least a predetermined period from a start of supplying positive and negative charges based on a new pixel data from the bidirectional amplifying means to the pixel capacitance, and for cutting off the charging load means from the pixel capacitance during any period except for the charge supply period.
Claim 20
Dependent Claim
31 words
A display apparatus according to claim 15 further comprising a responsive recovery switching means for repeatedly applying positive and negative voltages alternately to the pixel capacitance by a response recovery signal.
Claim 21
Dependent Claim
48 words
A display apparatus according to claim 15 further comprising a means connected between a common line and a ground line, both of which are connected to the buffer amplifying means, for preventing a current flowing between the common line and the ground line through the buffer amplifying means.
Claim 22
Dependent Claim
35 words
A display apparatus according to claim 15, wherein all transistors used in an area where the plurality of the pixels are formed are of one kind selected from the group consisting of P-channel and N-channel.
Claim 23
Dependent Claim
240 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the holding capacitance; a responsive recovery switching means for repeatedly applying positive and negative voltages alternately to the pixel capacitance by a response recovery signal; wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to pixel capacitance in accordance with a voltage of the holding capacitance; a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges pass through the charging load means via the load; and a charging load control means for connecting the charging load means in parallel with the pixel capacitance during a charge supply period including at least a predetermined period from a start of supplying positive and negative electric charges based on a new pixel data from the bidirectional amplifying means to the pixel capacitance, and for cutting off the charging load means from the pixel capacitance during any period except for the charge supply period.
Claim 24
Dependent Claim
240 words
A display apparatus comprising: a plurality of pixels, each of which is supplied with a pixel data; a pixel capacitance for accumulating an electric charge in accordance with the pixel data; a holding capacitance provided to each of the pixels to hold the pixel data; a buffer amplifying means for supplying the electric charge to the pixel capacitance in accordance with a voltage of the holding capacitance; a responsive recovery switching means for repeatedly applying positive and negative voltages alternately to the pixel capacitance by a response recovery signal; wherein the buffer amplifying means is a bidirectional amplifying means for supplying positive and negative charges to pixel capacitance in accordance with a voltage of the holding capacitance; a charging load means having a load connected in parallel with the pixel capacitance, wherein the pixel capacitance is supplied with the positive and negative electric charges by the bidirectional amplifying means, and the positive and negative electric charges pass through the charging load means via the load; and a charging load control means for connecting the charging load means in parallel with the pixel capacitance during a charge supply period including at least a predetermined period from a start of supplying positive and negative electric charges based on a new pixel data from the bidirectional amplifying means to the pixel capacitance, and for cutting off the charging load means from the pixel capacitance during any period except for the charge supply period.
References Cited (Backward Citations)
JPS5562480A
Cited
JPS5683781A
Cited
US4432610A
Cited
JPS5731159A
Cited
US4471347A
Cited
EP0079496A1
Cited
US4532506A
Cited
JPS645282A
Cited
US4870396A
Cited
US4781437A
Cited
US5111195A
Cited
JPH02245741A
Cited
JPH02272521A
Cited
JPH0377915A
Cited
JPH0377922A
Cited
US5194974A
Cited
JPH04190330A
Cited
US5165075A
Cited
JPH0593922A
Cited
JPH04310925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-05 | 2000-11-04 | 2001-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-05 | 2004-11-04 | 2005-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-05 | 2008-11-04 | 2009-05-06 | $7700.00 | Window Closed / Lapsed |