Display device having optical member, optical member controlled with pattern shaping wires, and method of fabricating optical member

Patent metadata

Field	Value
Publication number	US-11054568-B2
Application number	US-201916365926-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Apr 5, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A display device includes a display panel, a light guide plate, a first light source unit, and an optical member. The light guide plate is on the display panel. The first light source unit is configured to provide light to a side surface of the light guide plate. The optical member is between the light guide plate and the display panel. The optical member includes an interconnection layer, an optical pattern unit including first optical patterns on a surface of the interconnection layer, and first pattern shaping wires configured to receive a control voltage from the interconnection layer and to control a shape of each of the first optical patterns via the control voltage. Each of the first optical patterns is connected to a respective some of the first pattern shaping wires.

First claim

What is claimed is:

1. A display device, comprising:
a display panel;
a light guide plate on the display panel;
a first light source unit configured to provide light to a side surface of the light guide plate; and
an optical member between the light guide plate and the display panel,
wherein the optical member comprises:
an interconnection layer;
an optical pattern unit comprising first optical patterns and second optical patterns on a surface of the interconnection layer;
first pattern shaping wires configured to receive a control voltage from the interconnection layer and to control a shape of each of the first optical patterns via the control voltage; and
second pattern shaping wires configured to control a shape of each of the second optical patterns,

wherein each of the first optical patterns is connected to a respective some of the first pattern shaping wires,
wherein each of the second optical patterns is connected to a respective some of the second pattern shaping wires, and
wherein a number of the second pattern shaping wires connected to each of the second optical patterns is less than a number of the first pattern shaping wires connected to each of the first optical patterns.

2. The display device of claim 1 , wherein:
each of the first optical patterns has an isolated pattern shape when viewed in a plan view and has a trapezoidal shape when viewed in a sectional view; and
the first pattern shaping wires are connected to side surfaces of the first optical patterns.

3. The display device of claim 1 , wherein:
each of the first optical patterns has a bar shape extending in a first direction when viewed in a plan view and has a trapezoidal shape when viewed in a sectional view taken along a second direction crossing the first direction; and
the first pattern shaping wires are connected to side surfaces of the first optical patterns.

4. The display device of claim 1 , wherein the first optical patterns are spaced apart from each other by a uniform distance.

5. The display device of claim 1 , wherein:
each of the first pattern shaping wires comprises an electroactive polymer; and
application of the control voltage to the first pattern shaping wires is configured to change a shape of at least some of the first optical patterns.

6. The display device of claim 1 , wherein
when viewed in a plan view, a first distance between the first light source unit and each of the first optical patterns is greater than a second distance between the first light source unit and any of the second optical patterns.

7. The display device of claim 1 , wherein:
the optical pattern unit further comprises third optical patterns; and
when viewed in a plan view, a third distance between the first light source unit and each of the third optical patterns is greater than the first distance and the second distance.

8. The display device of claim 7 , further comprising:
a second light source unit configured to provide light to the light guide plate,
wherein the first light source unit and the second light source unit face each other with the light guide plate disposed therebetween.

9. The display device of claim 1 , wherein:
each of the first optical patterns comprises:
a first surface facing the light guide plate;
a second surface facing the display panel; and
a side surface connecting the first surface to the second surface;

an area of the first surface is less than an area of the second surface; and
the first pattern shaping wires are connected to the side surfaces of the first optical patterns.

10. The display device of claim 1 , wherein the display panel is configured to provide an image in a direction toward the light guide plate.

11. The display device of claim 1 , wherein the display panel is configured to provide an image in a direction away from the light guide plate.

12. A display device, comprising:
a display panel;
a light guide plate on the display panel;
a first light source unit configured to provide light to a side surface of the light guide plate; and
an optical member between the light guide plate and the display panel,
wherein the optical member comprises:
an interconnection layer;
an optical pattern unit comprising a first optical pattern and a second optical pattern spaced apart from each other and disposed on a surface of the interconnection layer; and
pattern shaping wires configured to receive a control voltage from the interconnection layer and to control a shape of each of the first and second optical patterns via the control voltage,

wherein each of the first and second optical patterns has an isolated pattern shape and is connected to a respective some of the pattern shaping wires,
wherein the first optical pattern is spaced apart from the first light source unit by a first distance, and the second optical pattern is spaced apart from the first light source unit by a second distance greater than the first distance, and
wherein a first side surface of the first optical pattern has a first area, and a second side surface of the second optical pattern has a second area greater than the first area.

13. The display device of claim 12 , wherein:
the pattern shaping wires connected to the first optical pattern having the first surface area are configured to receive a first control voltage;
the pattern shaping wires connected to the second optical pattern having the second surface area are configured to receive a second control voltage; and
the first control voltage is smaller than the second control voltage.

Assignees

• Samsung Display Co Ltd

Inventors

• Oh Sunhee
• You Junwoo
• Lee Taeho

Classifications

• G02F1/1336

  Illuminating devices · CPC title

• G02F1/1335 Primary

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• G02B6/0033

  Means for improving the coupling-out of light from the light guide · CPC title

• G02F1/061 Primary

  based on electro-optical organic material (G02F1/07, {G02F1/13} take precedence) · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title