US4726658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Effective value voltage stabilizer for a display apparatus
Assignee: Sharp Corp
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Filing: 1984-05-23
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Granted: 1988-02-23
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Expires: 2004-05-23
Abstract
Abstract A voltage stabilizer receiver power from a power circuit for inputting a power source voltage. The voltage stabilizer changes the width of pulses in accordance with the changes in the effective value of the power source voltage and stabilizes the effective value of an applied voltage to a display regardless of the change in the effective value of the power source voltage by subtracting this pulse from pulses comprising the display drive waveforms.
Inventors
- 👤 Toshio Nishimura
- 👤 Masakazu Saka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:35
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18; Y; Y10; Y10S; Y10S323/00; Y10S323/906
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
In a display drive circuit including display drive means for driving a display with display drive waveforms formed of drive pulses, said drive waveforms being developed from voltage supplied from a power source, an effective drive voltage stabilizer comprising: means for sensing said voltage developed from said power source and developing a binary representation of the relative value of said voltage; means, responsive to said binary representation, for supplying a control signal representative of the period of each said drive pulse to said display drive means, said display drive means being responsive to said control signal to control the period of each said drive pulse.
Claim 2
Dependent Claim
105 words
In a display drive circuit including display drive means for driving a display with display drive waveforms formed of drive pulses, said drive waveforms being developed from voltage supplied from a power source, an effective drive voltage stabilizer comprising: means for sensing said voltage developed from said power source and developing a binary representation of the relative value of said voltage; means, responsive to said binary representation, for supplying a control signal representative of the period of each said drive pulse to said display drive means, said display drive means being responsive to said control signal to control the period of each said drive pulse.
Claim 3
Dependent Claim
63 words
The drive voltage stabilizer of claim 1 wherein said control signal has a pulse width which varies in proportion to said binary representation; said display drive means reducing the pulse width of each said drive pulse by the width of said control signal to thereby produce drive pulses having a pulse width which decreases with increasing supply voltage developed by said voltage source.
Claim 4
Dependent Claim
14 words
The electronic apparatus of claim 1, wherein the display is a liquid crystal display.
Claim 5
Dependent Claim
14 words
The electronic apparatus of claim 1, wherein said power source is a solar battery.
Claim 6
Dependent Claim
18 words
The electronic apparatus of claim 1, wherein said stabilizing means is included within a large scale integrated circuit.
References Cited (Backward Citations)
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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) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |