Scanned display with variation compensation
First Claim
1. A method of stabilizing light intensity in a scanning beam display having a light source, the scanning beam display including a scanning pattern that includes a first region where the light is available for viewing by a user and a second region where the light is not available for viewing by the user, the light beam being within the first region during a series of viewing intervals and being in the second region during a series of non-viewing intervals, comprising steps of:
- activating the light source during a first non-viewing interval at a selected drive level;
determining a desired intensity of light corresponding to the drive level;
monitoring an actual intensity of light produced during the first non-viewing interval;
determining a deviation between the monitored actual intensity of the light and the desired intensity of light; and
driving the light source during the viewing interval as a function of the determined deviation.
1 Assignment
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Accused Products
Abstract
A display apparatus includes a scanning assembly that scans about two or more axes, typically in a raster pattern. A light source emits light toward the scanning assembly such that the scanning assembly simultaneously scans more than one of the beams. The light source is positioned such that its beam illuminates a discrete region of the image field. The image may be formed from a set of “tiles” where a single sweep of the scanning assembly scans a plurality of beams simultaneously. Various approaches to controlling the intensity of the light to compensate for variations in light source response or optical system response, or to balance the response of a tiles system are described. Among these approaches are scaling data in a buffer, active multiplication, or control of a D/A converter.
108 Citations
12 Claims
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1. A method of stabilizing light intensity in a scanning beam display having a light source, the scanning beam display including a scanning pattern that includes a first region where the light is available for viewing by a user and a second region where the light is not available for viewing by the user, the light beam being within the first region during a series of viewing intervals and being in the second region during a series of non-viewing intervals, comprising steps of:
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activating the light source during a first non-viewing interval at a selected drive level;
determining a desired intensity of light corresponding to the drive level;
monitoring an actual intensity of light produced during the first non-viewing interval;
determining a deviation between the monitored actual intensity of the light and the desired intensity of light; and
driving the light source during the viewing interval as a function of the determined deviation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
storing the data in a buffer;
retrieving a portion of the stored data; and
digitally processing the retrieved data.
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8. A method of stabilizing light intensity in a scanning beam display having a light source, the scanning beam display including a scanning pattern that includes a first region where the light is available for viewing by a user, the light beam being within the first region during a series of viewing intervals, comprising steps of:
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activating the light source during a first viewing interval at a selected drive level;
determining a desired intensity of light corresponding to the drive level;
monitoring an actual intensity of light produced during the viewing interval;
determining a deviation between the monitored actual intensity of the light and the desired intensity of light; and
driving the light source during a second viewing interval as a function of the determined deviation. - View Dependent Claims (9, 11, 12)
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10. The method of the image signal includes data representing the desired intensity and wherein the step of adjusting the driving signal current in response to the determined deviation includes digitally multiplying the data by a correction factor.
Specification