Granted Patent B1

US 11,269,132 · App. 17/240,257 · Granted Mar 8, 2022

Inventors: Yu-Lung Lin (Taoyuan, TW); Max Lu (Zhunan Township, TW); How-Lan Lin (Taipei, TW); Dan Odell Boice (Taipei, TW); Asim Siddiqui (Cedar Park, TX)

Assignee: Dell Products L.P.

G02B6/0061G02B6/0038G02B6/0055

Abstract

Claims (33)

1. A display device, comprising:

a light source arranged to emit light along a first edge of the display device; and

a light guide plate arranged to receive the emitted light at a minor surface of the light guide plate, the light guide plate including a plurality of prismatic elements configured to reemit the light out a first major surface of the light guide plate, wherein the light guide plate includes a first region having a first portion of the prismatic elements arranged in a first density to provide a first brightness of the light reemitted out the first major surface, and a second region having a second portion of the prismatic elements arranged in a second density to provide a second brightness of the light reemitted out the first major surface, wherein the first region is provided substantially along a first edge of the first major surface, the first edge being at the minor surface, wherein the second region is provided along a second, a third, and a fourth edge of the first major surface, and wherein the first brightness is brighter than the second brightness.

2. The display device of claim 1 , wherein the light source is a light emitting diode bar.

3. The display device of claim 1 , wherein the emitted light is in a visible light spectrum.

4. The display device of claim 1 , wherein the first density of prismatic elements is denser than the second density of prismatic elements.

5. The display device of claim 1 , wherein the prismatic elements include prismatic bumps formed in the light guide plate.

6. The display device of claim 1 , wherein the prismatic elements include prismatic lines formed in the light guide plate.

7. The display device of claim 1 , further comprising:

a reflector situated adjacent to a second major surface of the light guide plate.

8. The display device of claim 1 , further comprising:

a liquid crystal cell configure to receive the reemitted light from the light guide plate at a first major surface of the liquid crystal cell, and to provide a patterned image at a second major surface of the liquid crystal cell.

9. The display device of claim 1 , wherein the first brightness is not less than 300 nits, and wherein the second brightness is not greater than 250 nits.

10. A method, comprising:

emitting, by a light source of a display device situated along a first edge of the display device, light;

receiving, at a first minor surface of a light guide plate of the display device, the emitted light;

reemitting, at a first region of a first major surface of the light guide plate, the light at a first brightness, wherein the first region includes a first plurality of prismatic elements arranged in a first density to provide the first brightness, and wherein the first region is provided substantially along a first edge of the first major surface, the first edge being at the minor surface; and

reemitting, at a second region the first major surface, the light as a second brightness, wherein the second region includes a second plurality of prismatic elements arranged in a second density to provide the second brightness, wherein the second region is provided along a second, a third, and a fourth edge of the first major surface, and wherein the first brightness is brighter than the second brightness.

11. The method of claim 10 , wherein the light source is a light emitting diode bar.

12. The method of claim 10 , wherein the emitted light is in a visible light spectrum.

13. The method of claim 10 , wherein the first density of prismatic elements is denser than the second density of prismatic elements.

14. The method of claim 10 , wherein the prismatic elements include prismatic bumps formed in the light guide plate.

15. The method of claim 10 , wherein the prismatic elements include prismatic lines formed in the light guide plate.

16. The method of claim 10 , further comprising:

situating a reflector adjacent to a second major surface of the light guide plate.

17. The method of claim 10 , further comprising:

receiving, by a liquid crystal cell of the display device, the reemitted light from the light guide plate at a first major surface of the liquid crystal cell; and

providing a patterned image at a second major surface of the liquid crystal cell.

18. The method of claim 10 , wherein the first brightness is not less than 300 nits, and wherein the second brightness is not greater than 250 nits.

19. A light guide plate for a display device, the light guide plate comprising:

a minor surface at a first edge of the light guide plate, the minor surface configured to receive light emitted by the display device; and

a first major surface configured to reemit the emitted light, wherein the light guide plate includes a plurality of prismatic elements configured to reemit the light out the first major surface, wherein the light guide plate includes a first region having a first portion of the prismatic elements arranged in a first density to provide a first brightness of the light reemitted out the first major surface, and a second region having a second portion of the prismatic elements arranged in a second density to provide a second brightness of the light reemitted out the first major surface, wherein the first region is disposed substantially along a first edge of the first major surface, the first edge being at the minor surface, wherein the second region is provided along a second, a third, and a fourth edge of the first major surface, and wherein the first brightness is brighter than the second brightness.

20. The light guide plate of claim 19 , wherein the prismatic elements include at least one of prismatic bumps formed in the light guide plate, and prismatic lines formed in the light guide plate.

Assignments (10)