Bezel-free display device using directional backlighting
A display device comprising a display panel, a diffusing member positioned between the display panel and an observer, and a directional backlight wherein the directional backlight comprises a half angle divergence equal to or less than 15°. The display cover is preferably configured to shift an image displayed on the display panel relative to an observer to obscure a bezel surrounding the display panel. The use of a directional backlight and a diffusing display cover plate allows for a very small gap between the display panel and the display cover plate.
1. A display device comprising:
a directional backlight;
a diffusing member;
a display panel positioned between the directional backlight and the diffusing member, the display panel configured to display an image;
a bezel disposed about the display panel;
a diverging Fresnel lens array positioned between the display panel and the diffusing member; and
a converging Fresnel lens array positioned between the display panel and the diffusing member;
wherein a half angle divergence of light emitted by the directional backlight does not exceed 15° relative to a normal to a plane of the display panel.
2. The display device according to claim 1 , wherein the diffusing member comprises a display cover plate.
3. The display device according to claim 2 , wherein the display cover plate comprises glass.
4. The display device according to claim 3 , wherein the glass is a chemically strengthened glass.
5. The display device according to claim 2 , wherein the display cover plate comprises a light absorbing layer comprising an array of transparent regions.
6. The display device according to claim 5 , wherein the directional backlight comprises a diffusing screen, and wherein the diffusing screen does not extend opposite edge portions of the display panel.
7. The display device according to claim 6 , wherein a splitting film is positioned over the edge portions of the display panel.
8. The display device according to claim 1 , wherein the diffusing member comprises diffusive particles distributed within a substrate.
9. The display device according to claim 8 , wherein a mean particle size of the diffusive particles is between 100 and 300 nm.
10. The display device according to claim 8 , wherein a mean particle size of the diffusive particles is between 150 and 250 nm.
11. A display device comprising:
a directional backlight;
a diffusing member comprising a substrate, an array of lenses, a layer of light absorbing material disposed on the substrate, and a plurality of apertures formed in the light absorbing material; and
a display panel positioned between the directional backlight and the diffusing member, the display panel configured to display an image;
wherein the plurality of lenses of the diffusing member are positioned between the substrate of the diffusing member and the display panel.
12. The display device of claim 11 , wherein the plurality of lenses are a plurality of microlenses and the plurality of apertures are a plurality of circular apertures.
13. The display device of claim 11 , wherein the plurality of lenses are a plurality of cylindrical lenses and the plurality of apertures are a plurality of slit apertures.
14. The display device of claim 11 , wherein the light absorbing material of the diffusing member is positioned between the substrate of the diffusing member and the display panel.
15. The display device of claim 11 , wherein the light absorbing material is disposed on a majority of a surface of the substrate.
16. A display device comprising:
a directional backlight;
a diffusing member;
a display panel positioned between the directional backlight and the diffusing member, the display panel configured to display an image;
a backlight diffuser positioned between a central portion of the directional backlight and a central portion of the display panel; and
a splitting film positioned between an edge portion of the display panel and the diffusing member.
17. The display device of claim 16 , further comprising a turning film positioned between the directional backlight and the backlight diffuser.
18. The display device of claim 16 , wherein a distance between the diffusing member and the display panel increases toward the edge of the display panel.