Electronically scanned beam display
First Claim
Patent Images
1. A scanning beam display responsive to an image signal having a plurality of components, comprising:
- a first light source that emits a first beam of light along a first vector the first beam of light having an intensity defined by a first of the components;
a second light source that emits a second beam of light along a second vector intersecting the first vector at a first location, the second beam of light having an intensity defined by a second of the components; and
a scanner at the first location that receives the first and second light beams and redirects the first and second light beams toward an image field such that the first light beam strikes a first pixel area of the image field at a first time and second light beam strikes the first pixel area and second time following the first time.
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Abstract
A scanning control circuit generates a clock signal corresponding to an expected scan timing of a resonant scanner. In one approach, the control circuit uses a pair of direct digital synthesis (DDS) integrated circuits. A first DDS chip provides a system clock that is synchronized to the monitored period of the scanner. A second DDS chip generates a frequency chirped signal that has a frequency profile corresponding to a desired pixel clock timing. To control phase precisely, four complementary clock signals are weighted and mixed at light source drivers to produce relative phase shifts for different light sources.
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Citations
9 Claims
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1. A scanning beam display responsive to an image signal having a plurality of components, comprising:
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a first light source that emits a first beam of light along a first vector the first beam of light having an intensity defined by a first of the components; a second light source that emits a second beam of light along a second vector intersecting the first vector at a first location, the second beam of light having an intensity defined by a second of the components; and a scanner at the first location that receives the first and second light beams and redirects the first and second light beams toward an image field such that the first light beam strikes a first pixel area of the image field at a first time and second light beam strikes the first pixel area and second time following the first time. - View Dependent Claims (2, 3)
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4. A scanning control circuit for a scanning system having a plurality of sweep intervals, comprising:
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a primary clock signal circuit that produces a base pixel clock; a phase correction circuit that shifts the base pixel clock by a selected initial phase shift at a starting scan time and shifts the base pixel clock by a phase shift that varies sequentially during a selected sweep interval; and a phase shift control circuit including; a generator circuit that produces a sine wave; a complementary generator circuit that produces a complementary signal synchronized to the sine wave; and a mixing circuit that combines the sine wave and the complementary signal to produce a phase control signal. - View Dependent Claims (5)
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6. A display responsive to an image signal to produce an image having a plurality of wavelengths in an image field, comprising:
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a first light source responsive to a first control signal to emit a first light beam of a first wavelength along a first beam path; a second light source responsive to a second control signal to emit a second light beam of a second wavelength along a second beam path that substantially converges with the first beam path; a scanner positioned in the first and second light paths and oriented to direct the first light beam through a first scan path in the image field and to direct the second light beam through a second scan path in the image field, the first and second scan paths being substantially overlapping in the image field, with the second beam trailing the first beam by a first lag angle; an electronic control system responsive to a first color component corresponding to the first wavelength of the image signal to produce the first control signal and responsive to a second color component of the image signal to produce the second control signal, the second control signal lagging the first control signal by a delay corresponding to the first lag angle. - View Dependent Claims (7, 8, 9)
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Specification