Switchable 2D/3D display
View Patent ↗A display device comprises a backlight ( 6 ) and a light modulating layer ( 5 ) such as an LCD device. The backlight ( 6 ) can be controlled to operate as a single homogenous light source for producing 2D images or a series of narrow parallel light sources for producing 3D images. Preferably, the backlight ( 6 ) is an OLED device and the 2D/3D mode switching is achieved by selectively energising all or a subset of parallel control electrodes ( 11 ) of the OLED device.
1. A display device comprising:
a light source ( 6 ) comprising thin, substantially parallel, independently controllable control electrodes, wherein the light source ( 6 ) is configured for operation as a single broad light source or a plurality of narrow light sources, spaced in a spacing direction; and
an array ( 5 ) of light intensity modulators ( 15 ) for modulating light from the light source ( 6 ), wherein the light source ( 6 ) and the array ( 5 ) of light intensity modulators are arranged such that each modulator ( 15 ) is significantly illuminated by only one of said narrow sources; and a string of said modulators ( 15 ), which are parallel to said spacing direction, are illuminated by a corresponding one of said narrow light sources, wherein said control electrodes are skewed relative to a corresponding one of said string of said light intensity modulators such that said control electrodes extend under a plurality of said light intensity modulators.
2. A display device according to claim 1 , wherein the narrow light sources are elongate and aligned substantially perpendicular to the spacing direction.
3. A display device according to claim 1 , wherein the light source ( 6 ) has a light emitting face which is substantially coextensive with a plane parallel to the array ( 5 ).
4. A display device according to claim 1 , wherein the array ( 5 ) comprises an array of pixels ( 15 ) of a liquid crystal display ( 5 ).
5. A display device according to claim 1 , wherein the light source ( 6 ) comprises an organic light emitting diode structure.
6. A display device according to claim 1 , wherein the light source comprises a plurality of substantially parallel thick control electrodes and thin control electrodes, said thick control electrodes alternating with said thin control electrodes ( 11 a , 11 b ; 11 a ′, 11 a ″, 11 b ′, 11 b ″), wherein said thick and thin control electrodes are independently controllable.
7. A display device according to claim 6 , wherein said electrodes ( 11 a ′, 11 a ″, 11 b ′, 11 b ″) are arranged in a two-dimensional grid having a plurality of rows and columns.
8. A display device according to claim 4 , wherein the pixels ( 15 ) of the liquid crystal display ( 5 ) are arranged in rows and columns.
9. A display device according to claim 1 , wherein the light source ( 6 ) comprises a two-dimensional array of independently controllable light emitting regions ( 12 R, 12 G, 12 B) and a control circuit ( 16 ) configured for controlling said regions ( 12 R, 12 G, 12 B) in dependence on data representing an image to be displayed.
10. A display device according to claim 9 , wherein said regions ( 12 R, 12 G, 12 B) emit different coloured light.
11. A display device according to claim 10 , wherein said regions form a repeating pattern of red, green and blue emitters ( 12 R, 12 G, 12 B).
12. A display device according to claim 9 , wherein the control circuit ( 16 ) is configured for controlling the intensity of the light emitted by said regions ( 12 R, 12 G, 12 B) in dependence on data representing the local brightness of the image to be displayed.
13. A display device according to claim 1 , wherein the length of each of said strings is substantially the same as the spacing between its illuminating narrow source and a neighbouring narrow source thereof.
14. A display device according to claim 1 , including a control circuit ( 16 ), wherein the control circuit is configured for energising a first set ( 11 b 1 . . . 6 ) of said control electrodes ( 11 b 1 . . . 6 , 11 b′ 1 . . . 6 ) to produce a first image and subsequently energising a second set ( 11 b′ 1 . . . 6 ) of said control electrodes ( 11 b 1 . . . 6 , 11 b′ 1 . . . 6 ) to produce a second image.
15. An electronic apparatus including a display device comprising:
a light source ( 6 ) comprising thin, substantially parallel, independently controllable control electrodes, wherein the light source ( 6 ) is configured for operation as a single broad light source or a plurality of narrow light sources, spaced in a spacing direction; and
an array ( 5 ) of light intensity modulators ( 15 ) for modulating light from the light source ( 6 ), wherein the light source ( 6 ) and the array ( 5 ) of light intensity modulators are arranged such that each modulator ( 15 ) is significantly illuminated by only one of said narrow sources; and a string of said modulators ( 15 ), which are parallel to said spacing direction, are illuminated by a corresponding one of said narrow light sources, wherein said control electrodes are skewed relative to a corresponding one of said string of said light intensity modulators such that said control electrodes extend under a plurality of said light intensity modulators.