Patent US5237223A successfully refreshed from Google Patents.
US5237223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode detector for multimode monitor
Assignee: Samsung Electronics Co Ltd
•
Filing: 1992-09-18
•
Granted: 1993-08-17
•
Expires: 2012-09-18
Abstract
Abstract A mode detector of a multimode monitor comprising a band separation circuit for separating band of input vertical and horizontal frequencies to provide logic signals, a control signal generation circuit for providing mode control signals, and a mode control circuit for controlling each mode of the multimode monitor. According to the present invention, the vertical and horizontal sizes, the vertical and horizontal oscillating frequencies, the horizontal pin cushion and the like can be automatically controlled according to the mode of input frequencies by detecting the mode of the input frequencies in the control signal generation circuit and by providing the combined logic signals of the control signal generation circuit to the mode control circuit.
Inventors
- 👤 Moon J. Song
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:05
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/14; G09G1/16; G09G1/165; G09G2320/00; G09G2320/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
In a mode detector of a multimode monitor including a mode control circuit for controlling a mode of monitor by being switched according to an applied control signal, said detector comprising: a band separation circuit for separating inputted vertical and horizontal frequency signals according to band and for providing a plurality of logic signals, said band separation circuit including: a vertical frequency-to-voltage converter coupled to a source of said vertical frequency signal for providing a high level signal when the input vertical frequency is higher than a predetermined frequency; a horizontal frequency-to-voltage converter coupled to a source of said horizontal frequency signal for providing a dc voltage in proportion to the input horizontal frequency; and a horizontal frequency band separator coupled to said horizontal frequency-to-voltage converter for providing logic signals according to the output level of said horizontal frequency-to-voltage converter; a control signal generating circuit composed of first and second logic combination circuits for combining the logic signals applied from said band separation circuit and for providing a combined logic signal to said mode control circuit.
Claim 2
Dependent Claim
176 words
In a mode detector of a multimode monitor including a mode control circuit for controlling a mode of monitor by being switched according to an applied control signal, said detector comprising: a band separation circuit for separating inputted vertical and horizontal frequency signals according to band and for providing a plurality of logic signals, said band separation circuit including: a vertical frequency-to-voltage converter coupled to a source of said vertical frequency signal for providing a high level signal when the input vertical frequency is higher than a predetermined frequency; a horizontal frequency-to-voltage converter coupled to a source of said horizontal frequency signal for providing a dc voltage in proportion to the input horizontal frequency; and a horizontal frequency band separator coupled to said horizontal frequency-to-voltage converter for providing logic signals according to the output level of said horizontal frequency-to-voltage converter; a control signal generating circuit composed of first and second logic combination circuits for combining the logic signals applied from said band separation circuit and for providing a combined logic signal to said mode control circuit.
Claim 3
Dependent Claim
86 words
Apparatus according to claim 1 wherein said first logic combination circuit includes first and second inverters connected to said vertical frequency-to-voltage converter, third and fourth inverters connected to said horizontal frequency band separator, and an AND gate connected to said horizontal frequency-band separator and said third inverter; and wherein said second logic combination circuit includes three NAND gates coupled to said first, second and fourth inverters and the AND gate in said first logic combination circuit and three inverters respectively connected to said three NAND gates.
Claim 4
Dependent Claim
148 words
In a mode detector of a multimode monitor including a mode control circuit for controlling a mode of monitor by being switched according to an applied control signal, said detector comprising: a band separation circuit for separating inputted vertical and horizontal frequency signals according to band and for providing a plurality of logic signals; a control signal generating circuit composed of first and second logic combination circuits for combining the plurality of logic signals applied from said band separation circuit and for providing a plurality of combined logic signals to said mode control circuit, wherein said first logic combination circuit includes first and second inverters connected to a vertical frequency-to-voltage converter of said ban separation circuit, a third inverter coupled to a horizontal frequency band separator of band separation circuit, and an AND gate coupled to a horizontal frequency-band separator of band separation circuit and said third inverter.
Claim 5
Dependent Claim
148 words
In a mode detector of a multimode monitor including a mode control circuit for controlling a mode of monitor by being switched according to an applied control signal, said detector comprising: a band separation circuit for separating inputted vertical and horizontal frequency signals according to band and for providing a plurality of logic signals; a control signal generating circuit composed of first and second logic combination circuits for combining the plurality of logic signals applied from said band separation circuit and for providing a plurality of combined logic signals to said mode control circuit, wherein said first logic combination circuit includes first and second inverters connected to a vertical frequency-to-voltage converter of said ban separation circuit, a third inverter coupled to a horizontal frequency band separator of band separation circuit, and an AND gate coupled to a horizontal frequency-band separator of band separation circuit and said third inverter.
Claim 6
Dependent Claim
238 words
In a mode detector of a multimode monitor including a mode control circuit for controlling a mode of monitor by being switched according to an applied control signal, said detector comprising: a band separation circuit for separating inputted vertical and horizontal frequency signals according to band and for providing a plurality of logic signals; and a control signal generating circuit composed of first and second logic combination circuits for combining a plurality of logic signals applied from said band separation circuit and for providing a plurality of combined logic signals to said mode control circuit, wherein said second logic combination circuit include: a NAND gate of which one terminal is connected to an output terminal of the second inverter of said first logic combination circuit and the other terminal is connected to an output terminal of AND gate of said first logic combination circuit; NAND gate of which one terminal is connected to an output terminal of the first inverter of said first logic combination circuit and the other terminal is connected to an output terminal of the AND gate of said first logic combination circuit; NAND gate of which one terminal is connected to an output terminal of the first inverter of said first logic combination circuit and the other terminal is connected to an output terminal of the fourth inverter of said first logic combination circuit; and three inverters respectively connected to said three NAND gates.
Claim 7
Dependent Claim
238 words
In a mode detector of a multimode monitor including a mode control circuit for controlling a mode of monitor by being switched according to an applied control signal, said detector comprising: a band separation circuit for separating inputted vertical and horizontal frequency signals according to band and for providing a plurality of logic signals; and a control signal generating circuit composed of first and second logic combination circuits for combining a plurality of logic signals applied from said band separation circuit and for providing a plurality of combined logic signals to said mode control circuit, wherein said second logic combination circuit include: a NAND gate of which one terminal is connected to an output terminal of the second inverter of said first logic combination circuit and the other terminal is connected to an output terminal of AND gate of said first logic combination circuit; NAND gate of which one terminal is connected to an output terminal of the first inverter of said first logic combination circuit and the other terminal is connected to an output terminal of the AND gate of said first logic combination circuit; NAND gate of which one terminal is connected to an output terminal of the first inverter of said first logic combination circuit and the other terminal is connected to an output terminal of the fourth inverter of said first logic combination circuit; and three inverters respectively connected to said three NAND gates.
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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |