Microlens array film and display device including the same

Patent metadata

Field	Value
Publication number	US-9523797-B2
Application number	US-201314029188-A
Country	US
Kind code	B2
Filing date	Sep 17, 2013
Priority date	Sep 21, 2012
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

Provided are a microlens array film and a display device including the same. The microlens array film includes a first transparent electrode and a second transparent electrode facing each other and a flexible polymer layer placed between the first and the second transparent electrodes. Lenses may be freely deformed by regulating voltages applied to the first and second transparent electrodes.

First claim

What is claimed is:

1. A microlens array film comprising:
a first transparent electrode and a second transparent electrode facing each other, at least one of the first and second transparent electrodes including a flat portion;
a flexible polymer layer having a surface for forming lenses, the flexible polymer layer being placed between the first and the second transparent electrodes;
a first substrate being in contact with at least a bottom surface of the flexible polymer layer, each of the first and second transparent electrodes being in direct contact with the first substrate; and
a second substrate being flexible and in contact with at least a top surface of the flexible polymer layer, each of the first and second transparent electrodes being in direct contact with the second substrate,
wherein a distance between the first transparent electrode and the second transparent electrode is reduced by applying voltages of opposite signs to the first and second transparent electrodes, respectively,
wherein the surface for forming lenses changes as result of when the distance between the first transparent electrode and the second transparent electrode is reduced.

2. The microlens array film as set forth in claim 1 , wherein the first transparent electrode, the flexible polymer layer, and the second transparent electrode constitute a single unit operating part, and
wherein the microlens array film includes a plurality of unit operating parts placed to be spaced apart from each other between the first and second substrates.

3. The microlens array film as set forth in claim 2 , wherein at least one of the first and second transparent electrodes extends to cover at least one of a top surface of the first substrate and a bottom surface of the second substrate.

4. The microlens array film as set forth in claim 1 , wherein the first substrate is transparent and flexible.

5. The microlens array film as set forth in claim 1 , wherein the flexible polymer layer is made concave laterally when voltages of opposite signs are applied to the first and second transparent electrodes, respectively.

6. The microlens array film as set forth in claim 1 , wherein a width of the flexible polymer layer adjacent to the second substrate is made smaller than that of the flexible polymer layer adjacent to the first substrate when voltages of opposite signs are applied to the first and second transparent electrodes, respectively.

7. The microlens array film as set forth in claim 1 , further comprising:
a reflection layer covering the first transparent electrode or the second transparent electrode.

8. A display device comprising:
a microlens array film set forth in claim 1 , and
a light source unit adjacent to the microlens array film.

9. The display device as set forth in claim 8 , wherein the light source unit includes a light source element, an optical waveguide adjacent to the light source element, and a mirror placed at the optical waveguide.

10. The display device as set forth in claim 8 , further comprising:
a condensing lens unit spaced apart from the light source unit with the microlens array film interposed therebetween and adapted to condense light emitted through the microlens array film.

11. The display device as set forth in claim 8 , further comprising:
a reflection plate spaced apart from the light source unit with the microlens array film interposed therebetween.

12. The display device as set forth in claim 8 , further comprising:
a reflection layer placed to cover a top surface of the microlens array film.

13. The display device as set forth in claim 12 , wherein at least the microlens array film is flexible.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Yun Sung Ryul
• Kyung Ki-Uk
• Park Suntak
• Park Bong Je
• Kim Young Sung

Classifications

• G02B3/0006 Primary

  Arrays (G02B3/02, G02B5/188 take precedence) · CPC title

• G02B3/0056

  arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085) · CPC title

• F21V33/0052

  Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor · CPC title

• G02B3/0043 Primary

  Inhomogeneous or irregular arrays, e.g. varying shape, size, height · CPC title