US5638137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Configurable video output channel architecture
Assignee: NEC Electronics Corp
•
Filing: 1993-12-22
•
Granted: 1997-06-10
•
Expires: 2013-12-22
Abstract
Abstract A configurable video output channel architecture includes a plurality of parallel video pipelines arranged to drive a video display; a device for selecting an output of one of the video pipelines and generating a readback signal representative thereof; and a device for adjusting a display specification of at least one of the video pipelines using the readback signal. The display specification adjusted may include the maximum video level, the blanking level, and the sync level of the video waveform. The adjusting device may also adjust the characteristic impedance of each pipeline. The selecting device includes a multiplexer and an analog to digital converter, and the adjusting device includes a controller which monitors the readback signal and generates a control signal to adjust the display specification if the readback signal is outside of a desired range.
Inventors
- 👤 Larry J. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:03
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/28; G09G1/285; H; H04; H04N; H04N9/00; H04N9/64; H04N9/645; H04N9/73
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, said selecting means comprises a multiplexer and an analog to digital converter; and adjusting means for adjusting a maximum picture level of said analog color signals to be within a desired range using said readback signal, said adjusting means comprises a controller for monitoring the readback signal and outputting an adjustment control signal, a digital to analog converter for converting the adjustment control signal to analog form, and a voltage adjustment device for adjusting the maximum picture level in accordance with the adjustment control signal.
Claim 2
Dependent Claim
162 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, said selecting means comprises a multiplexer and an analog to digital converter; and adjusting means for adjusting a maximum picture level of said analog color signals to be within a desired range using said readback signal, said adjusting means comprises a controller for monitoring the readback signal and outputting an adjustment control signal, a digital to analog converter for converting the adjustment control signal to analog form, and a voltage adjustment device for adjusting the maximum picture level in accordance with the adjustment control signal.
Claim 3
Dependent Claim
40 words
A configurable video output channel architecture as claimed in claim 1, further comprising means for replacing one of said digital color values with test data, wherein a corresponding one of said analog color signals is selected by said selecting means.
Claim 4
Dependent Claim
172 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image data into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, wherein said selecting means comprises a multiplexer and an analog to digital converter; and adjusting means for adjusting a blanking level of one of said analog color signals to be within a desired range using said readback signal, wherein said adjusting means comprises a controller for monitoring the readback signal and outputting an adjustment control signal, a digital to analog converter for converting the adjustment control signal to analog form, and a voltage adjustment device for adjusting the blanking level of said one analog color signal in accordance with the analog adjustment control signal.
Claim 5
Dependent Claim
172 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image data into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, wherein said selecting means comprises a multiplexer and an analog to digital converter; and adjusting means for adjusting a blanking level of one of said analog color signals to be within a desired range using said readback signal, wherein said adjusting means comprises a controller for monitoring the readback signal and outputting an adjustment control signal, a digital to analog converter for converting the adjustment control signal to analog form, and a voltage adjustment device for adjusting the blanking level of said one analog color signal in accordance with the analog adjustment control signal.
Claim 6
Dependent Claim
40 words
A configurable video output channel architecture as claimed in claim 3, further comprising means for replacing one of said digital color values with test data, wherein a corresponding one of said analog color signals is selected by said selecting means.
Claim 7
Dependent Claim
145 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image data into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, wherein said selecting means comprises a multiplexer and an analog to digital converter; and characteristic impedance adjusting means for adjusting a characteristic impedance of the selected analog color signal to be within a desired range using said readback signal, wherein said adjusting characteristic impedance means comprises a source impedance circuit and a controller for monitoring the readback signal and outputting an adjustment control signal in accordance therewith.
Claim 8
Dependent Claim
145 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image data into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, wherein said selecting means comprises a multiplexer and an analog to digital converter; and characteristic impedance adjusting means for adjusting a characteristic impedance of the selected analog color signal to be within a desired range using said readback signal, wherein said adjusting characteristic impedance means comprises a source impedance circuit and a controller for monitoring the readback signal and outputting an adjustment control signal in accordance therewith.
Claim 9
Dependent Claim
40 words
A configurable video output channel architecture as claimed in claim 5, further comprising means for replacing one of said digital color values with test data, wherein a corresponding one of said analog color signals is selected by said selecting means.
Claim 10
Dependent Claim
171 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image data into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, wherein said selecting means comprises a multiplexer and an analog to digital converter; and adjusting means for adjusting a composite sync level of one of said analog color signals to be within a desired range using said readback signal, wherein said adjusting means comprises a controller for monitoring the readback signal and outputting an adjustment control signal, a digital to analog converter for converting the adjustment control signal to analog form, and a current source for adjusting the sync level of said one analog color signal in accordance with the adjustment control signal.
Claim 11
Dependent Claim
171 words
A configurable video output channel architecture, comprising: random access memory which stores a display image in digital form; a video look-up table which contains color palette information for converting said display image data into digital color values; digital to analog conversion means for converting said digital color values into analog color signals; a video amplifier for amplifying the analog color signals; selecting means for selecting one of the analog color signals and outputting a readback signal representative thereof, wherein said selecting means comprises a multiplexer and an analog to digital converter; and adjusting means for adjusting a composite sync level of one of said analog color signals to be within a desired range using said readback signal, wherein said adjusting means comprises a controller for monitoring the readback signal and outputting an adjustment control signal, a digital to analog converter for converting the adjustment control signal to analog form, and a current source for adjusting the sync level of said one analog color signal in accordance with the adjustment control signal.
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) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |