Control of directional display
First Claim
1. A directional backlight apparatus comprising:
- a directional backlight comprisinga waveguide comprising first and second, opposed guide surfaces for guiding input light along the waveguide, andan array of light sources arranged to generate the input light at different input positions in a lateral direction across the waveguide,the waveguide further comprising a reflective end for reflecting the input light back through the waveguide, the second guide surface being arranged to deflect light after reflection from the reflective end as output light through the first guide surface, and the waveguide being arranged to direct the output light into optical windows in output directions that are distributed in the lateral direction in dependence on the input position of the input light; and
a sensor system arranged to detect a position of a head of an observer; and
a control system arranged to selectively operate a group of adjacent light sources to direct light into a corresponding group of adjacent optical windows, in a manner in which the identity of the light sources in the group varies, and for a given group of light sources the luminous flux of the light sources varies, in accordance with the detected position of the head of the observer.
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Accused Products
Abstract
Disclosed is a light guiding valve apparatus including an imaging directional backlight, an illuminator array and an observer tracking system arranged to achieve control of an array of illuminators which may provide a directional display to an observer over a wide lateral and longitudinal viewing range, wherein the luminous intensity of optical windows presented to the observer as viewing windows is controlled dependent on the lateral and longitudinal position or speed of an observer. Further an optical window control system may comprise detection of an observer'"'"'s hand. An image control system may comprise a method to provide an image that can be switched from a first mode with a first brightness into a second mode with a high brightness region and low brightness region, where the brightness of the second low brightness region is matched to the first brightness.
325 Citations
41 Claims
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1. A directional backlight apparatus comprising:
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a directional backlight comprising a waveguide comprising first and second, opposed guide surfaces for guiding input light along the waveguide, and an array of light sources arranged to generate the input light at different input positions in a lateral direction across the waveguide, the waveguide further comprising a reflective end for reflecting the input light back through the waveguide, the second guide surface being arranged to deflect light after reflection from the reflective end as output light through the first guide surface, and the waveguide being arranged to direct the output light into optical windows in output directions that are distributed in the lateral direction in dependence on the input position of the input light; and a sensor system arranged to detect a position of a head of an observer; and a control system arranged to selectively operate a group of adjacent light sources to direct light into a corresponding group of adjacent optical windows, in a manner in which the identity of the light sources in the group varies, and for a given group of light sources the luminous flux of the light sources varies, in accordance with the detected position of the head of the observer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A directional display apparatus comprising:
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a directional display device capable of directing output light selectively into optical windows of a set of optical windows in output directions that are distributed across the display device; and a control system arranged to control the display device to direct the output light into at least one selected optical window of the set, the directional display apparatus being arranged to sense a disposition of a hand of an observer, the control system being arranged to change the control of the display device in response to the sensed disposition of the hand of the observer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A display apparatus comprising:
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a spatial light modulator; a backlight arranged to illuminate the entire area of the spatial light modulator; and a control system arranged to control the transmittance of the spatial light modulator in accordance with input image data to display an image, and further arranged to control the brightness of the backlight, the control system being arranged to operate in at least a first and second mode, wherein in the first mode, the control system is arranged to control the brightness of the backlight to a first brightness level and to control the transmittance of the spatial light modulator in accordance with the input image data with a relationship between the input data and the transmittance of the spatial light modulator that is the same across the image, and in the second mode, the control system is arranged to control the brightness of the backlight to a second brightness level greater than the first brightness level, and to control the transmittance of the spatial light modulator in accordance with the input image data with relationships between the input data and the transmittance of the spatial light modulator that are different in different regions of the image. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method of controlling a display apparatus that comprises a spatial light modulator and a backlight arranged to illuminate the entire area of the spatial light modulator, the method comprising:
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in a first mode, controlling the brightness of the backlight to a first brightness level and controlling the transmittance of the spatial light modulator in accordance with input image data to display an image with a relationship between the input data and the transmittance of the spatial light modulator that is the same across the image; and in a second mode, controlling the brightness of the backlight to a second brightness level greater than the first brightness level, and controlling the transmittance of the spatial light modulator in accordance with input image data to display an image with relationships between the input data and the transmittance of the spatial light modulator that are different in different regions of the image.
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Specification