Wide angle imaging directional backlights
A directional display and orientation technology, applied in optics, light guides, optical components, etc., can solve the problems of reducing the brightness of the display, increasing the visual fatigue of the observer, and increasing the degree of image crosstalk, so as to reduce power consumption, improve overall performance, reduce reflection effect
Active Publication Date: 2019-03-01
REALD SPARK LLC
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Problems solved by technology
Undesirably, such displays exhibit image flickering when the observer moves laterally relative to the display, thus limiting the viewing freedom of the display
This type of flicker can be reduced by defocusing the optics; however, such defocusing results in increased image crosstalk and increases observer fatigue
Such flicker can be reduced by adjusting the shape of the pixel holes, however, such changes can reduce display brightness and can compromise addressing of the electronics in the spatial light modulator
Method used
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[0107] A time multiplexed autostereoscopic display can advantageously improve the spatial resolution of the autostereoscopic display by directing light from all pixels of the spatial light modulator to a first viewing window in a first time slot and Light from all pixels is directed to the second viewing window in the time slot. Thus, an observer whose eyes are arranged to receive light in the first viewing window and the second viewing window will see a full resolution image across the entire display over multiple time slots. Time-multiplexed displays may advantageously achieve directional illumination by directing an array of illuminators through a substantially transparent time-multiplexed spatial light modulator using directional optics, wherein the directional optics form substantially in the plane of the window Image of the illuminator array.
[0108] The uniformity of the viewing window may advantageously be independent of the arrangement of the pixels in the spatial l...
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An imaging directional backlight apparatus includes a waveguide and a light source array, providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, and the steps may further include extraction features optically hidden to guided light, propagating in a forward direction. Returning light propagating in a backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. Viewing windows are formed through imaging individual light sources and define the relative positions of system elements and ray paths. The imaging directional backlight apparatus further includes a control system for controlling the light output directional distribution in an automotive or vehicle environment in dependence on the output from sensors mounted on the vehicle. The control system is arranged to control the light output direction distribution of portable directional displays co-located with the vehicle.
Description
technical field [0001] The present disclosure relates generally to illumination of light modulating devices, and more particularly to control of directional displays for automated applications and light guides for viewing from 2D, privacy, night mode, 3D, and / or autostereoscopic display devices Local light sources used in provide lighting over large areas. Background technique [0002] Spatially multiplexed autostereoscopic displays typically align a parallax component (such as a lenticular screen or parallax barrier) with an image array arranged as at least a first set of pixels on a spatial light modulator (eg, LCD) and the second set of pixels. A parallax component directs light from each of the sets of pixels in different respective directions to provide a first viewing window and a second viewing window at the front of the display. An observer who places his eye in the first viewing window sees a first image with light from a first set of pixels; and places his eye in...
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IPC IPC(8): G02B6/00G02F1/13357
CPCH04N13/302H04N13/368H04N13/32G02F1/1323G02F1/13318G02F1/133615G02B6/0016G02B6/0048H04N13/31H04N13/383G02B6/0055G02B6/0068G02B27/0149G06T7/70G02B6/0045G02F2203/12H04N7/183
Inventor J·哈罗德G·J·伍德盖特
Owner REALD SPARK LLC