DETECTING AMBIENT LIGHT LEVELS IN A VISION SYSTEM
First Claim
1. A method of detecting ambient light in an optical touch-sensitive display device, the optical touch-sensitive display device comprising a display screen, an illuminant and an image sensor, the method comprising:
- capturing an image of at least a portion of the display screen with the image sensor;
determining whether an ambient light level in the image is at an acceptable level for display screen operation; and
displaying a visual representation of whether the ambient light level is acceptable for display screen operation.
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Accused Products
Abstract
The detection of ambient light on an optical touch-sensitive device is disclosed. For example, one disclosed embodiment comprises capturing an image of at least a portion of a display screen with a camera located within the display device, and determined if ambient light in the image is at an acceptable level for display screen operation. Then, a visual representation is displayed representing whether the ambient light level is acceptable for display screen operation.
33 Citations
20 Claims
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1. A method of detecting ambient light in an optical touch-sensitive display device, the optical touch-sensitive display device comprising a display screen, an illuminant and an image sensor, the method comprising:
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capturing an image of at least a portion of the display screen with the image sensor; determining whether an ambient light level in the image is at an acceptable level for display screen operation; and displaying a visual representation of whether the ambient light level is acceptable for display screen operation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of installing an optical touch-sensitive device, the optical touch-sensitive device comprising a display screen, an illuminant configured to illuminate a backside of the display screen, and an image sensor configured to capture an image of a backside of the display screen, the method comprising:
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illuminating the display screen with the illuminant while measuring a first gray level value with a black screen located on the display screen, and while measuring a second gray level value with a white screen located on the display screen; computing a threshold level using the first and second gray level values; capturing an image of the display screen; determining a level of ambient light in the image; comparing the level of ambient light on the screen with the threshold value; and providing a visual representation of whether the ambient light level is acceptable for display screen operation based upon the comparison with the threshold value. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical touch-sensitive device, comprising:
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a display screen having a touch surface and a backside; an image sensor configured to capture an image of the backside of the screen; an illuminant configured to illuminate the backside of the screen; and a controller configured to; operate the image sensor to capture an image of the display screen; determine an ambient light level in the image; and display a visual representation of whether the ambient light level is acceptable for display screen operation. - View Dependent Claims (17, 18, 19, 20)
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Specification