Polarizing modulator for an electronic stereoscopic display
First Claim
1. In an electronic stereoscopic display system of the type wherein images are sequentially scanned across an electronic display, wherein the display, a polarizing sheet and a modulator are held in juxtaposition and observed by a user with polarizing eyewear, wherein the modulator includes a plurality of segments each having liquid crystal material and arranged contiguously in a direction of the sequential scan, and wherein each segment is selectively driven in correspondence with the scan by applying and removing a drive voltage to drive the liquid crystal to a high state and a low state, respectively, wherein the improvement comprises tuning the phase shift of each liquid crystal to eliminate the perception of visible lines between the segments.
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Abstract
A polarizing modulator for use in an electronic stereoscopic display system having a sequentially scanning display includes a plurality of liquid crystal segments arranged contiguously in a direction of the sequential scan. The liquid crystal material used in each segment has its phase shift tuned to eliminate the perception of a visible line between segments. In a preferred embodiment, the phase shift is tuned by applying a bias voltage to the liquid crystal in its low state.
121 Citations
16 Claims
- 1. In an electronic stereoscopic display system of the type wherein images are sequentially scanned across an electronic display, wherein the display, a polarizing sheet and a modulator are held in juxtaposition and observed by a user with polarizing eyewear, wherein the modulator includes a plurality of segments each having liquid crystal material and arranged contiguously in a direction of the sequential scan, and wherein each segment is selectively driven in correspondence with the scan by applying and removing a drive voltage to drive the liquid crystal to a high state and a low state, respectively, wherein the improvement comprises tuning the phase shift of each liquid crystal to eliminate the perception of visible lines between the segments.
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8. A polarizing modulator for an electronic stereoscopic display system having a sequentially scanning display, comprising:
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a plurality of segments each containing liquid crystal material and arranged contiguously in a direction of the sequential scan, and driving circuitry coupled to each segment and adapted to drive each segment to a high state with a drive voltage and to a low state with a bias voltage such that an optical artifact creating a perception of visible lines between the segments is eliminated. - View Dependent Claims (9, 10, 11)
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12. A drive circuit for a modulator in an electronic stereoscopic display system having a sequentially scanning display, wherein the modulator includes a plurality of segments each containing liquid crystal material and arranged contiguously in a direction of the sequential scan, comprising:
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a plurality of amplifiers each coupled to drive a respective segment, and a plurality of multiplexors each coupled to a respective amplifier and each selecting one of four voltages to provide to the amplifier in response to two control inputs from a controller, said four voltages being a drive voltage of positive polarity, a drive voltage of negative polarity, a bias voltage of positive polarity and a bias voltage of negative polarity, said controller comprising;
a circuit receiving a scan signal from the display system, wherein the scan signal is in a high state when one image perspective is visible and a low state when another image perspective is visible, an oscillating crystal, and a circuit calculating timing and generating said two control inputs based on the transition of the scan signal between high and low states, wherein a first of the control inputs is set to one state to select a drive voltage and another state to select a bias voltage, and wherein a second of the control inputs is set to one state to select a positive polarity and to another state to select a negative polarity. - View Dependent Claims (13, 14, 15, 16)
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Specification