Display device and light guide plate

• US 10,459,148 B1
• Filed: 08/28/2018
• Issued: 10/29/2019
• Est. Priority Date: 07/20/2018
• Status: Active Grant

• Current Assignee: Memslux Co.
• Original Assignee: Memslux Co.
• Inventors: Yoon, Jun-Bo, Lim, Keun-Seo, Hwang, Shin-Ae
• Primary Examiner(s): Quarterman, Kevin
• Application Number:
  US16/114,869
• Time in Patent Office: 427 Days
• CPC Class Codes: G02B 6/0025 Diffusing sheet or layer; Prismatic sheet or layer
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/1221 made from organic materials

Abstract

A display device including a light source and a light guide plate may be provided. The light guide plate includes: a light guiding part which guides light incident on a side thereof from the light source by total internal reflection; a fine pattern portion which emits the guided light only to an upper portion of the light guiding part; a guard ring portion which protects the fine pattern portion from the intrusion of impurities; and a light emitting member which is disposed on a top surface of the fine pattern portion and a top surface of the guard ring portion. The light guide plate is formed of a transparent material.

Claims

1. A display device comprising:

a light source; and

a light guide plate,

wherein the light guide plate comprises;

a light guiding part which guides light incident on a side thereof from the light source by total internal reflection;

a fine pattern portion which emits the guided light only to an upper portion of the light guiding part;

a guard ring portion which protects the fine pattern portion from the intrusion of impurities; and

a light emitting member which is disposed on a top surface of the fine pattern portion and a top surface of the guard ring portion,

and wherein the light guide plate is formed of a transparent material.

2. The display device of claim 1, wherein the guard ring portion is formed to surround an outermost portion of the fine pattern portion on the light guiding part.

3. The display device of claim 1, wherein adhesion of the fine pattern portion to the light guiding part is complemented by adhesion between the guard ring portion and the light guiding part.

4. The display device of claim 1,

wherein the fine pattern portion comprises a plurality of microstructures,

wherein the guard ring portion is formed by a plurality of guard rings,

and wherein a width of a bottom surface of at least one of the plurality of guard rings is greater than that of at least one of the plurality of microstructures.

5. The display device of claim 1, wherein the light guide plate is manufactured by performing a first process of forming the fine pattern portion on the light emitting member and by a second process of adhering a bottom surface of the fine pattern portion to the light guiding part.

6. The display device of claim 1, wherein the light guide plate is manufactured by performing a first process of forming the fine pattern portion on the light guiding part and a second process of adhering a top surface of the fine pattern portion to the light emitting member.

7. The display device of claim 1, further comprising a frame which blocks the light which is emitted through the guard ring portion.

8. The display device of claim 1, further comprising a controller for controlling an amount of the emitted light of the light guide plate.

9. The display device of claim 1, wherein the display device is disposed toward a user, and wherein the light emitted from the light guide plate directly reaches the user.

10. The display device of claim 1, wherein the display device is disposed toward a front portion of a light receiving and reflecting body, and wherein, when the light is emitted in a dark environment, the light receiving and reflecting body is identified by the light reflected from the light receiving and reflecting body.

11. The display device of claim 1, wherein the transparent material comprises Polymethylmethacrylate (PMMA), Styrenemethyl Methacrylate (SMMA), Cyclic olefin copolymer (COC), etc.

12. The display device of claim 1, wherein the guard ring portion and the fine pattern portion are adhered to the light guiding part by using a predetermined adhesive, and wherein the predetermined adhesive comprises pressure sensitive adhesive (PSA), optically clear adhesive (OCA), optically clear resin (OCR), UV adhesive, oligomer, primer, silane coupling agent, silica-organic hybrid resins, etc.

13. The display device of claim 1, further comprising a reflective tape which diffusely reflects a part of the light incident on the side thereof from the light source.

14. A light guide plate comprising:

a light guiding part which guides light incident on a side thereof from the light source by total internal reflection;

a fine pattern portion which emits the guided light only to an upper portion of the light guiding part;

a guard ring portion which protects the fine pattern portion from the intrusion of impurities; and

a light emitting member which is disposed on a top surface of the fine pattern portion and a top surface of the guard ring portion,

and wherein the light guide plate is formed of a transparent material.

15. The light guide plate of claim 14, wherein the guard ring portion is formed to surround an outermost portion of the fine pattern portion on the light guiding part.

16. The light guide plate of claim 14, wherein adhesion of the fine pattern portion to the light guiding part is complemented by adhesion between the guard ring portion and the light guiding part.

17. The light guide plate of claim 14,

wherein the fine pattern portion comprises a plurality of microstructures,

wherein the guard ring portion is formed by a plurality of guard rings,

and wherein a width of a bottom surface of at least one of the plurality of guard rings is greater than that of at least one of the plurality of microstructures.

18. The light guide plate of claim 14, wherein the light guide plate is manufactured by performing a first process of forming the fine pattern portion on the light emitting member and by a second process of adhering a bottom surface of the fine pattern portion to the light guiding part.

19. The light guide plate of claim 14, wherein the light guide plate is manufactured by performing a first process of forming the fine pattern portion on the light guiding part and a second process of adhering a top surface of the fine pattern portion to the light emitting member.

20. The light guide plate of claim 14, further comprising a frame which blocks the light which is emitted through the guard ring portion.

21. The light guide plate of claim 14, wherein the transparent material comprises Polymethylmethacrylate (PMMA), Styrenemethyl Methacrylate (SMMA), Cyclic olefin copolymer (COC), etc.

22. The light guide plate of claim 14, wherein the guard ring portion and the fine pattern portion are adhered to the light guiding part by using a predetermined adhesive, and wherein the predetermined adhesive comprises pressure sensitive adhesive (PSA), optically clear adhesive (OCA), optically clear resin (OCR), UV adhesive, oligomer, primer, silane coupling agent, silica-organic hybrid resins, etc.

23. The light guide plate of claim 14, wherein the light guide plate is disposed toward a user, and wherein the light emitted from the light guide plate directly reaches the user.

24. The light guide plate of claim 14, wherein the light guide plate is disposed toward a front portion of a light receiving and reflecting body, and wherein, when the light is emitted in a dark environment, the light receiving and reflecting body is identified by the light reflected from the light receiving and reflecting body.