DISPLAY SYSTEM WITH SPATIAL LIGHT MODULATOR ILLUMINATION FOR DIVIDED PUPILS
Illuminations systems that separate different colors into laterally displaced beams may be used to direct different color image content into an eyepiece for displaying images in the eye. Such an eyepiece may be used, for example, for an augmented reality head mounted display. Illumination systems may be provided that utilize one or more waveguides to direct light from a light source towards a spatial light modulator. Light from the spatial light modulator may be directed towards an eyepiece. Some aspects of the invention provide for light of different colors to be outcoupled at different angles from the one or more waveguides and directed along different beam paths.
1 .- 54 . (canceled)
55 . A display device, comprising:
a light source;
a waveguide coupled, using a coupling lens, to the light source to receive, as received light, light from the light source;
an outcoupling optical element configured to outcouple, from the waveguide and onto a spatial light modulator, the received light; and
a shutter unit comprising one or more electronically controlled shutters that form one or more channels to transmit the received light, wherein the one or more electronically controlled shutters receive light output from the waveguide, and wherein the light output from the waveguide is modulated by the spatial light modulator.
56 . The display device of claim 55 , wherein the light source is a light emitting diode (LED) that emits one or more color components.
57 . The display device of claim 55 , comprising an analyzer situated between the waveguide and the spatial light modulator.
58 . The display device of claim 57 , wherein the analyzer is configured to attenuate light of one polarization state in comparison to another polarization state.
59 . The display device of claim 58 , wherein the spatial light modulator is configured to modulate a polarization state of light.
60 . The display device of claim 55 , wherein the shutter unit comprises one or more color filters associated with the one or more electronically controlled shutters.
61 . The display device of claim 60 , wherein the one or more color filters are aligned with the one or more electronically controlled shutters to form the one or more channels.
62 . The display device of claim 61 , wherein each channel of the one or more channels selectively transmits a particular color of light.
63 . The display device of claim 61 , wherein the one or more color filters comprise absorption filters and/or interference filters.
64 . The display device of claim 61 , wherein the one or more electronically controlled shutters comprises color selective liquid crystal (LC).
65 . The display device of claim 55 , comprising imaging optics, wherein the imaging optics are configured to project light from the spatial light modulator onto the shutter unit.
66 . The display device of claim 55 , comprising control electronics, wherein the control electronics are in electrical communication with the spatial light modulator and the shutter unit.
67 . The display device of claim 66 , wherein the control electronics are configured to control opening and closing of the one or more electronically controlled shutters.
68 . The display device of claim 67 , wherein the control electronics comprise a clock circuit configured to synchronize opening and closing of the one or more electronically controlled shutters.
69 . The display device of claim 68 , wherein no more than one channel of the one or more channels on the shutter unit is open at any given time.
70 . The display device of claim 68 , wherein the control electronics are configured to control a refresh of the spatial light modulator.