Autostereoscopic display apparatus having optical magnification
View Patent ↗An autostereoscopic display device has display elements, each of which has an output light intensity distribution which has at least two non-zero light intensity levels, comprising a first light intensity at the center of the display element area and a second lower light intensity at a periphery of the display element area. This means the light intensity drops more gradually at the pixel edges, so that the abrupt pixel edges are less visible despite the magnification provided by a lens arrangement of the autostereoscopic display device.
1. An autostereoscopic display apparatus, comprising:
a plurality of individually addressable display elements arranged in an array of rows and columns, wherein each display element comprises the smallest area displaying a single pixel of image data of a single color; and
a lens arrangement for directing different views displayed simultaneously by the display elements to different spatial locations,
wherein each display element has an output light intensity distribution and a display element area, the display element area having at least a center and a periphery,
wherein the light intensity distribution has at least two non-zero light intensity levels, the at least two non-zero light intensity level comprising a first light intensity at the center of the display element area and a second lower light intensity at a periphery of the display element area.
2. An apparatus as claimed in claim 1 , wherein each display element comprises an electroluminescent material having a uniform light output intensity across the display element area and an optical filter above the electroluminescent material,
wherein the optical filter is arranged to adjust the output light intensity distribution.
3. An apparatus as claimed in claim 1 ,
wherein each display element comprises at least two electroluminescent material areas,
wherein each electroluminescent material area is associated with a drive transistor.
4. An apparatus as claimed in claim 3 , further comprising a drive electrode for each electroluminescent material area, wherein each display element is associated with a single addressing electrode.
5. An apparatus as claimed in claim 3 , further comprising an addressing electrode for each electroluminescent material area, wherein each display element is associated with a single drive electrode.
6. An apparatus as claimed in claim 3 , wherein each display element is associated with a single drive electrode and a single addressing electrode, wherein the drive transistor associated with each electroluminescent material area has different current output characteristics.
7. An apparatus as claimed in claim 3 ,
wherein each display element is associated with a single drive electrode and a single addressing electrode,
wherein the drive transistors associated with the electroluminescent material areas have the same current output characteristics,
wherein the surface areas of the electroluminescent material areas are different.
8. An apparatus as claimed in claim 3 , wherein each display element comprises a central electroluminescent material area and an outer concentric electroluminescent material area around the central area.
9. An apparatus as claimed in claim 8 , further comprising a filter having an absorption that increases towards periphery of the display element area and varying the display element output intensity.
10. An apparatus as claimed in claim 1 , wherein the lens arrangement comprises a lenticular lens array,
wherein the lenses have a long axis,
wherein the long axis is slanted at an acute angle to the direction of the columns of the array.
11. An apparatus as claimed in claim 1 , wherein the smallest area which is for displaying a single pixel of image data of a single color is one Red sub-pixel, one Green sub-pixel or one Blue sub-pixel of one pixel.
12. A method of operating an autostereoscopic display apparatus, wherein the apparatus comprises a plurality of individually addressable display elements arranged in an array of rows and columns wherein each display element comprises the smallest area which is for displaying a single pixel of image data of a single color, wherein the method comprises:
directing different views displayed simultaneously by the display elements to different spatial locations using a lens arrangement; and
controlling the output light intensity distribution for each display element to have a first light intensity at the color of the display element area and a second lower light intensity at a periphery of the display element area.
13. An autostereoscopic display apparatus, comprising:
a plurality of individually addressable display elements of a pixel arranged in an array of rows and columns; and
a lens arrangement for directing different views displayed simultaneously by the display elements to different spatial locations;
wherein each display element include a set of at least one sub-pixel elements of one color and has an output light intensity distribution,
wherein the sub-pixel provides a first non-zero light intensity at the center of the display element area and a second lower non-zero light intensity at a periphery of the display element area,
wherein respective display elements of a set of at least one of sub-pixel elements of one color have different light intensities.