Video image display apparatus and timing control method
First Claim
1. A video image display apparatus for displaying a video image in accordance with a video image signal, comprising:
- a light source for emitting an illumination light to a color wheel driven by a color wheel driving unit to rotate the color wheel for filtering and transmitting lights of different colors therefrom;
a spatial light modulator (SLM) for receiving said lights of different color projected from said color wheel;
a master clock signal generation unit for generating a master clock signal constituting a reference for transferring data to the SLM;
a frame start signal generation unit for generating, from the master clock signal, a frame start signal indicating the start of a frame;
a wheel position detection unit for detecting an angular position of the color wheel;
a phase comparison unit for comparing a phase of the frame start signal with a wheel index signal generated from the wheel position detection unit indicating a position of the color wheel; and
a motor control unit for receiving a phase comparison signal from said phase comparison unit for controlling a rotation speed of a motor for driving the color wheel to rotate at a controlled rotation speed.
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Accused Products
Abstract
A video image display apparatus for displaying a video image in accordance with a video image signal including: a light source for emitting an illumination light to a color wheel driven by a color wheel driving unit to rotate the color wheel for filtering and transmitting lights of different colors therefrom; a spatial light modulator (SLM) for receiving the lights of different colors projected from the color wheel; a master clock signal generation unit for generating a master clock signal constituting a reference for transferring data to the SLM; a frame start signal generation unit for generating, from the master clock signal, a frame start signal indicating the start of a frame; a wheel position detection unit for detecting an angular position of the wheel; a phase comparison unit for comparing a phase of the frame start signal with a wheel index signal generated from the wheel position detection unit indicating a position of the color wheel; and a motor control unit for receiving a phase comparison signal from the phase comparison unit for controlling a rotation speed of a motor for driving the color wheel to rotate at a controlled rotation speed.
37 Citations
13 Claims
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1. A video image display apparatus for displaying a video image in accordance with a video image signal, comprising:
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a light source for emitting an illumination light to a color wheel driven by a color wheel driving unit to rotate the color wheel for filtering and transmitting lights of different colors therefrom; a spatial light modulator (SLM) for receiving said lights of different color projected from said color wheel; a master clock signal generation unit for generating a master clock signal constituting a reference for transferring data to the SLM; a frame start signal generation unit for generating, from the master clock signal, a frame start signal indicating the start of a frame; a wheel position detection unit for detecting an angular position of the color wheel; a phase comparison unit for comparing a phase of the frame start signal with a wheel index signal generated from the wheel position detection unit indicating a position of the color wheel; and a motor control unit for receiving a phase comparison signal from said phase comparison unit for controlling a rotation speed of a motor for driving the color wheel to rotate at a controlled rotation speed. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a video image display apparatus comprising:
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applying a master clock signal as a reference for generating a data transfer start signal indicating a start for transferring data to a spatial light modulator (SLM); generating a phase comparison signal by comparing a phase of the data transfer start signal with a wheel index signal indicating an angular position of a color wheel; and applying said phase comparison signal for controlling a rotation speed the color wheel. - View Dependent Claims (7, 8, 9, 10)
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11. A method for controlling a video image display apparatus for displaying a video image comprising:
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determining a transmission start time of sending data for lights of different colors to a spatial light modulator (SLM); determining a start time of projecting said lights of different colors to the SLM from a light source; calculating a difference between a start time of sending data to the SLM and a start time of the wavelength of light incident to the SLM; and controlling the start time of projecting said lights of different colors from the light source to the SLM to eliminate the difference. - View Dependent Claims (12, 13)
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Specification