Directional OLED display
A time multiplexed, selectively updated, sub-pixel less, self-aligning, electrically and optically dual addressed, multi directional pixel is provided. This can potentially greatly increase the performance of an automultiscopic display and reduce the complexity. In one embodiment, an automultiscopic display can simply be provided by a plurality of directional OLED pixels.
1. A display for directional control of an image to an observer, said display comprising:
a plurality of image pixels arranged in a first segment covering an area of said display,
each image pixel defining an area having a plurality of subpixels,
each subpixel being optically addressable and comprising:
a thin film stack of an electroluminescent layer and a photo sensitive layer,
said electroluminescent layer and said photo sensitive layer constituting an optical converter such that light incident on a respective subpixel leads to generation of a first current through said photo sensitive layer and through said electroluminescent layer such that said electroluminescent layer emits light from the position of said respective subpixel within said image pixel when a voltage being applied across said thin film stack,
said display comprising:
an addressing light element having a plurality of addressing pixels for emitting light from a respective addressing pixel to said first segment and optically addressing the subpixels of said segment,
said plurality of addressing pixels comprising at least a respective first addressing pixel defining a first direction from said first segment towards said viewpoint, and a respective second addressing pixel defining a second direction from said first segment towards a second viewpoint,
said first direction being different from said second direction,
an optical arrangement between said addressing light element and said optical converter, said optical arrangement having an optical power,
a front optical arrangement, said front optical arrangement having an optical power and a first focal point substantially at said optical converter, and a second focal point between said front optical arrangement and a point in front of and infinitely far away from said front optical arrangement,
a controller for addressing a respective addressing pixel for emitting light from said respective addressing pixel,
said optical arrangement adapted for directing the light from said respective addressing pixel to the subpixels of said segment such that the subpixels of said first segment emits light visible from said viewpoint.
2. The display according to claim 1 , said optical converter having a front side towards said observer, and a backside opposite said front side.
3. The display according to claim 1 , said electroluminescent layer constituting an organic light-emitting diode or organic light emitter.
4. The display according to claim 1 , said optical arrangement and said addressing light element arranged behind said optical converter relative to said viewpoint.
5. The display according to claim 1 , said optical arrangement and said addressing light element arranged in front of said optical converter relative to said viewpoint.
6. The display according to claim 1 , comprising a second plurality of image pixels arranged in a second segment covering an area of said display for emitting light visible from said viewpoint.
7. The display according to claim 6 , said second segment arranged next to said first segment.
8. The display according to claim 6 , said second segment having a view angle from said viewpoint to said second segment different than the view angle from said viewpoint to said first segment.
9. The display according to claim 6 , comprising a second addressing light element having a second plurality of addressing pixels for emitting light from a respective addressing pixel to said second segment and optically addressing the subpixels of said second segment.
10. The display according to claim 1 , said optical arrangement comprising a plurality of optical elements.
11. The display according to claim 1 , the number of optical elements corresponding to the number of image pixels.
12. The display according to claim 11 , a respective optical element adapted to compensate for an off-axis position of said optical element relative to a center axis of the addressing light element.
13. The display according to claim 11 , a respective optical element having a prismatic property and/or being tilted relative to a plane of the addressing light element.