APPARATUS FOR DISPLAY SYSTEMS
Apparatus for use in display systems are disclosed. In certain implementations, a display apparatus includes a light guide plate for use in a liquid crystal display backlight system. In other implementations, an apparatus for use in a projection display is disclosed including a substantially transparent rectangular prism. In implementations including laser-based light sources, the light guide plate or substantially transparent rectangular prism is configured to reduce the spatial coherence of laser light introduced thereto, thereby reducing speckle. The light guide or prism includes a plurality of light scattering particles suspended therein; alternatively the light guide or prism has a set of scratches on a surface thereof, rending the surface substantially opaque.
1 . A display apparatus, comprising:
a light guide plate including a plurality of light scattering particles suspended within the light guide plate;
a laser array positioned along a first edge of the light guide plate for introducing laser light into the light guide plate, wherein the laser array includes a plurality of lasers of at least one primary color, wherein each of the lasers in the array has a FWHM bandwidth greater than about 0.1 nm; and
an array of light modulators to modulate the light emitted from the light guide plate to form an image on the display apparatus.
2 . The display apparatus of claim 1 , wherein the light guide plate comprises an acrylic material.
3 . The display apparatus of claim 2 , wherein the acrylic material comprises poly Methyl Methacrylate (PMMA).
4 . The display apparatus of claim 1 , wherein the light scattering particles are randomly dispersed within the light guide plate to create random scattering of the laser light to substantially destroy the spatial coherence of the laser light prior to its exit through an output end of the light guide plate.
5 . The display apparatus of claim 1 , wherein the first edge of the light guide plate comprises a cut-out pattern.
6 . The display apparatus of claim 1 , comprising Uniformity Tape coupled to the first edge.
7 . The display apparatus of claim 1 , comprising a plurality of side reflectors positioned adjacent to at least a second edge of the light guide plate.
8 . The display apparatus of claim 1 , comprising a back reflector positioned adjacent a to a back surface of the light guide plate.
9 . The display apparatus of claim 1 , wherein the lasers in the laser array comprise semiconductor diode lasers.
10 . The display apparatus of claim 1 , wherein at least two of the lasers in the array are of a common primary color and have center wavelengths that are shifted with respect to one another.
11 . The display apparatus of claim 1 , wherein the light guide plate has a transmissiveness, and the density of the light scattering particles is selected such that the transmissiveness is between about 80% and about 95%.
12 . The display apparatus of claim 1 , wherein the transmissiveness of the light guide plate is between about 91% and about 93%.
13 . The display apparatus of claim 1 , comprising at least one LED light source positioned along an edge of the light guide plate for introducing light of at least a second primary color into the light guide plate.
14 . A display apparatus, comprising:
a light guide plate comprising a back surface incorporating a set of scratches which render at least a majority of the area of the back surface substantially opaque;
a laser array positioned along a first edge of the light guide plate for introducing laser light into the light guide plate, wherein the laser array includes a plurality of lasers of at least one primary color, wherein each of the lasers in the array has a FWHM bandwidth greater than about 0.1 nm; and
an array of light modulators to modulate the light emitted from the light guide plate to form an image on the display apparatus.
15 . The display apparatus of claim 14 , wherein the light guide plate comprises an acrylic material.
16 . The display apparatus of claim 15 , wherein the acrylic material comprises poly Methyl Methacrylate (PMMA).
17 . The display apparatus of claim 14 , wherein the scratches have a substantially random arrangement across the back surface of the light guide to substantially destroy the spatial coherence of the laser light prior to its exit through an output end of the light guide plate.
18 . The display apparatus of claim 14 , wherein the back surface further comprises a border region substantially free from scratches along the first edge, the border region having a width of between about 10 mm and about 25 mm.
19 . The display apparatus of claim 14 , wherein the first edge of the light guide plate comprises a cut-out pattern.
20 . The display apparatus of claim 14 , comprising a plurality of side reflectors positioned adjacent to at least a second edge of the light guide plate.
21 .- 50 . (canceled)