Integrated modulator illumination
View Patent ↗A spatial light modulator includes an array of elements to modulate light in accordance with image data. The modulator has a display panel having first and second surfaces arranged adjacent to the array of elements such that the second surface is directly adjacent the array of elements to allow a viewer to view an image produced by modulation of light The modulator may also include a light source to provide light to the display panel and illumination dots on the first surface of the display panel to reflect light from the source to the array of elements.
1. A display device comprising:
a transparent substrate having a front side and a back side, the back side configured to face away from a viewer;
an array of spatial light modulators on the back side of the substrate, each spatial light modulator comprising a movable mirror configured to reflect modulated light out through the front side of the substrate;
an edge illuminator residing at one edge of the substrate and configured to inject light into the one edge of the substrate, wherein light propagating from the edge illuminator propagates through the substrate due to total internal reflection from the front side and the back side of the substrate; and
reflective elements on the front side of the substrate, the reflective elements configured to reflect the light to the array of spatial light modulators.
2. The display device of claim 1 , further comprising a diffuser disposed on the front side of the substrate.
3. The display device of claim 2 , wherein the reflective elements are disposed at an interface between the diffuser and the substrate.
4. The display device of claim 1 , wherein the substrate comprises a first surface through which the viewer sees the modulated light and the reflective elements are disposed on the first surface.
5. The display device of claim 2 , wherein the reflective elements are disposed on a surface of the diffuser.
6. The display device of claim 1 , further comprising an anti-reflective coating on the front side of the substrate.
7. The display device of claim 1 , wherein the spatial light modulators comprise a fixed partially reflecting surface and a cavity between the fixed partially reflecting surface and the movable mirror.
8. The display device of claim 1 , wherein the spatial light modulators are fabricated directly on the substrate.
9. The display device of claim 1 , wherein the reflective elements comprise illumination dots.
10. The display device of claim 9 , wherein the illumination dots comprise a first layer that is reflective towards the spatial light modulators and a second layer that is absorbing towards the viewer.
11. The display device of claim 9 , wherein the illumination dots have a size below the resolution of a human eye.
12. The display device of claim 1 , wherein the edge illuminator comprises a light emitting diode.
13. The display device of claim 1 , wherein the edge illuminator comprises a cold cathode fluorescent tube.
14. The display device of claim 1 , wherein the edge illuminator comprises an edge emitting light pipe.
15. The display device of claim 14 , wherein the edge emitting light pipe is illuminated by a light emitting diode.