DIRECTIONAL BACKLIGHT, A MULTIPLE VIEW DISPLAY AND A MULTI-DIRECTION DISPLAY
First Claim
1. A directional backlight comprising a light source for emitting light that is at least partially collimated, and an optical arrangement for splitting the light from the light source and directing the light from the light source simultaneously in at least mainly a first range of directions and a second range of directions different from the first range of directions;
- wherein the optical arrangement comprises a plurality of prisms.
1 Assignment
0 Petitions
Accused Products
Abstract
A directional backlight, a multiple view display and a multi-direction display A multiple view display (18) comprises a directional display device (19) for displaying a first image or sequence of images so as to be mainly visible from a first range of directions relative to the device and for simultaneously displaying a second image or sequence of images so as to be mainly visible from a second range of directions relative to the device different from the first range. The display (18) further comprises a directional backlight (20) for directing light through the display device (19) at least mainly in the first and second ranges. Since the directional backlight (20) directs light through the display device (19) at least mainly in the first and second ranges, the display provides users located in the first and second ranges with images of greater intensity than a conventional display. The backlight may be arranged to direct substantially no light in at least part of a third range of directions that lies between the first range of directions and the second range of directions. This provides a ‘black window’ between the first and second ranges in which the intensity of the display is lower than in other ranges. The intensity of the display in the black window is possibly zero, or close to zero, so that an observer located in this window will not perceive an image.
-
Citations
56 Claims
-
1. A directional backlight comprising a light source for emitting light that is at least partially collimated, and an optical arrangement for splitting the light from the light source and directing the light from the light source simultaneously in at least mainly a first range of directions and a second range of directions different from the first range of directions;
wherein the optical arrangement comprises a plurality of prisms. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
-
6. A directional backlight comprising a light source and an optical arrangement for directing light from the light source at least mainly in a first range of directions and a second range of directions different from the first range of directions;
wherein the optical arrangement comprises an array of substantially non-light-transmissive blocking elements and an array of imaging elements;
wherein each blocking elements is associated with a respective different one of the imaging element; and
wherein each imaging element is substantially aligned with a respective one of the blocking elements thereby reducing or substantially preventing light from being directed between the first and second ranges.- View Dependent Claims (7)
-
11. A directional backlight comprising a light source, and an optical arrangement for splitting the light from the light source and directing the light from the light source at least mainly in a first range of directions and a second range of directions different from the first range of directions;
wherein the optical arrangement comprises a waveguide having a plurality of diffusive regions and an array of imaging elements disposed in the optical path of light from the waveguide. - View Dependent Claims (12, 13)
-
24. A multi-directional two-dimensional display comprising:
-
a display device for displaying a single image at a time, which image is visible throughout a range of directions including first and second ranges for first and second viewers, the first and second ranges being disposed on opposite sides of and spaced from the normal to a display surface of the device; and a directional backlight for directing light through the device with higher intensity in the first and second ranges than in a third range including the normal;
wherein the intensity in the third range is non-zero. - View Dependent Claims (25, 27, 28, 29)
-
-
26. (canceled)
-
30. A dual view display comprising:
-
a display device for displaying first and second images or sequences of images; a backlight for directing light through the device; and
an observing arrangement for permitting the first and second images or sequences of images to be visible from first and second ranges of directions, respectively, and for preventing the first and second images or sequences of images from being visible from a third range of directions including the normal to a display surface of the device, the first and second ranges being non-overlapping with the third range;
wherein the observing arrangement comprises a plurality of transmissive regions, each of which is arranged to be substantially non-transmissive to light from at least one adjacent pixel and to be substantially transmissive to light from at least one non-adjacent pixel. - View Dependent Claims (31, 32, 36, 37, 38, 39, 40, 41)
-
-
33. A dual view display comprising:
-
a display device for displaying first and second images or sequences of images; a backlight for directing light through the device; and an observing arrangement for permitting the first and second images or sequences of images to be visible from first and second ranges of directions, respectively, and for preventing the first and second images or sequences of images from being visible from a third range of directions including the normal to a display surface of the device, the first and second ranges being non-overlapping with the third range; wherein the observing arrangement comprises a first parallax barrier having a plurality of slits and a second parallax barrier having a plurality of slits, each slit of the second parallax barrier being disposed above a region between adjacent slits of the first parallax barrier. - View Dependent Claims (34)
-
-
35. A multiple view display comprising:
- a display device for displaying first and second images or sequences of images;
a backlight for directing light through the device; and
an observing arrangement for permitting the first and second images or sequences of images to be visible from first and second ranges of directions, respectively, and for preventing the first and second images or sequences of images from being visible from a third range of directions including the normal to a display surface of the device, the first and second ranges being non-overlapping with the third range;
wherein the observing arrangement comprises a plurality of colour-selective reflectors, each of which is arranged to reflect the colour of light from at least one adjacent pixel and to transmit the colour of light from at least one non-adjacent pixel.
- a display device for displaying first and second images or sequences of images;
-
56-59. -59. (canceled)
Specification