US5170158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display apparatus
Assignee: Toshiba Corp
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Filing: 1990-06-28
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Granted: 1992-12-08
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Expires: 2010-06-28
Abstract
Abstract A display device has a driver circuit for driving data lines in a matrix display panel according to input digital signals. The driver circuit includes a number of digital-to-analog (D/A) converters, which number is less than the number of pixels contained in one horizontal scanning line. The D/A converters are repeatedly used to sequentially convert portions of the input digital image signal corresponding to one horizontal scanning line. The analog signals obtained by each D/A conversion are retained by a sample-and-hold circuit. When storage for one horizontal scanning line is completed, the signals are simultaneously delivered to the data lines. Therefore the display device can be reduced to a small circuit size. Also the offset voltage of the sample-and-hold circuitry can be reduced, since the outputs from the D/A converters can be sampled at an interval longer than the interval between pixels in the input digital signals.
Inventors
- 👤 Masako Shinya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:43
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/2007; G09G3/2011; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3688; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G2310/0294; G09G2310/0297
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A driver for a display having plural scan lines of N pixels comprising: M digital-to-analog (D/A) converters, said number M being less than the number of pixels N contained in one scan line; digital storage means for storing input digital image signals corresponding to at least said one scan line, and for distributing M pixels represented by said input digital image signals to said M D/A converters simultaneously; analog holding means for holding analog image signals delivered from said D/A converters; and delivering means for delivering said analog image signals held in said analog holding means to said display.
Claim 2
Dependent Claim
99 words
A driver for a display having plural scan lines of N pixels comprising: M digital-to-analog (D/A) converters, said number M being less than the number of pixels N contained in one scan line; digital storage means for storing input digital image signals corresponding to at least said one scan line, and for distributing M pixels represented by said input digital image signals to said M D/A converters simultaneously; analog holding means for holding analog image signals delivered from said D/A converters; and delivering means for delivering said analog image signals held in said analog holding means to said display.
Claim 3
Dependent Claim
25 words
The display device according to claim 1, wherein said digital storage means comprises multiplexer means for distributing said input image signals to said D/A converters.
Claim 4
Dependent Claim
63 words
The drive according to claim 1, wherein: said digital storage means comprises M shift registers having each n bits and N/M stages, where n is the number of bits in said input digital image signal for each pixel; and said driver further comprises means for causing said shift registers to deliver each group of M pixels of data to said D/A converters sequentially.
Claim 5
Dependent Claim
56 words
The driver according to claim 1, wherein said digital storage means comprises a shift register having n bits and N stages, where n is the number of bits in said input digital image signal for each pixel, and said shift register sequentially delivers said digital image signal to said D/A converters from a predetermined M stages.
Claim 6
Dependent Claim
25 words
The display device according to claim 4, wherein said digital storage means comprises multiplexer means for distributing said input image signals to said D/A converters.
Claim 7
Dependent Claim
54 words
The driver according to claim 1, wherein said digital storage means comprises a shift register having n bits and M stages, where n is the number of bits in said input digital image signal for each pixel, and M latches, each connecting one stage of said shift register to one of said digital-to-analog converters.
Claim 8
Dependent Claim
25 words
The display device according to claim 6, wherein said digital storage means comprises multiplexer means for distributing said input image signals to said D/A converters.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |