OPTICAL SHEET MODULE CONSISTING OF OPTICAL SHEETS HAVING DIFFERENT THICKNESSES

• US 20150301264A1
• Filed: 06/24/2013
• Published: 10/22/2015
• Est. Priority Date: 06/25/2012
• Status: Active Grant

• Current Assignee: LMS Incorporated (Davey Tree Expert Company)
• Original Assignee: LMS Incorporated (Davey Tree Expert Company)
• Inventors: Min, Jee Hong, Kim, Young Il, Cho, Sung Sik, Lee, Woo Jong, Lee, Tae Jun, Kim, Hee Jeong, Kang, Yong Jin
• Granted Patent: US 10,598,846 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/045 Prism arrays
• 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 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

An optical sheet module consisting of optical sheets having different thicknesses, includes: a first base film having a predetermined thickness and transmitting light from a lower portion thereof through an upper portion thereof; an upper optical sheet formed on the first base film and having a first structural pattern in which the upper optical sheet protrudes upwardly and the cross-sectional area thereof decreases when progressing toward an upper portion thereof; a second based film laminated beneath the upper optical sheet so as to transmit light from a lower portion thereof to the upper optical sheet; and a lower optical sheet formed on the second base film and having a second structural pattern in which the lower optical sheet protrudes toward the upper optical sheet and the cross-sectional area thereof decreases when progressing toward an upper portion thereof. The first base film is relatively thicker than the second base film.

Claims

1. An optical sheet module, comprising:

an upper optical sheet having a first base film which has a predetermined thickness and transmits light transmitted from a lower portion to pass the light through an upper portion and a first structural pattern which is formed on the first base film and upwardly protrudes, so that a cross-sectional area decreases when progressing toward an upper portion thereof; and

a lower optical sheet laminated beneath the upper optical sheet and having a second base film and a second structural pattern which is formed on the second base film and protrudes toward the upper optical sheet, so that a cross-sectional area decreases when progressing toward an upper portion thereof,

wherein a thickness of the first base film is relatively larger than a thickness of the second base film.

2. The optical sheet module of claim 1, wherein the first base film and the second base film are formed to have uniform thicknesses, respectively.

3. The optical sheet module of claim 1, wherein the first base film is formed by laminating a plurality of film layers.

4. The optical sheet module of claim 1, wherein an upper end of the second structural pattern is bonded to a lower portion of the first base film.

5. The optical sheet module of claim 1, further comprising:

an adhesive layer which is provided between the upper optical sheet and the lower optical sheet to bond the first base film and the second structural pattern.

6. The optical sheet module of claim 5, wherein an upper end of the second structural pattern is buried in the adhesive layer.

7. The optical sheet module of claim 6, wherein an upper end of the second structural pattern is in contact with a lower portion of the first base film.

8. The optical sheet module of claim 1, wherein a cross-sectional trace of the first structural pattern or the second structural pattern is a straight line.

9. The optical sheet module of claim 1, wherein the first structural pattern and the second structural pattern have the same cross-sectional shape and are formed to extend along a lateral direction.

10. The optical sheet module of claim 9, wherein the upper optical sheet and the lower optical sheet are disposed such that an extending direction of the first structural pattern and an extending direction of the second structural pattern intersect each other.

11. The optical sheet module of claim 1, further comprising:

a reflective polarizer which is disposed to be laminated with the lower optical sheet and the upper optical sheet to selectively transmit light in accordance with a polarization state of light transmitted from a lower portion.

12. The optical sheet module of claim 11, wherein the reflective polarizer is laminated between the upper optical sheet and the lower optical sheet.

13. The optical sheet module of claim 11, wherein the reflective polarizer is laminated above the upper optical sheet.

14. An optical sheet module comprising:

an upper optical sheet in which a first structural pattern which is formed on an upper surface to upwardly protrude, so that a cross-sectional area decreases when progressing toward an upper portion thereof to concentrate light transmitted from a lower portion; and

a lower optical sheet which is laminated beneath the upper optical sheet and has a second structural pattern which is formed on an upper surface to protrudes toward the upper optical sheet, so that a cross-sectional area decreases when progressing toward an upper portion thereof, to concentrate light transmitted from a lower portion to transmit the light to the upper optical sheet;

wherein a distance from a lowest point of the first structural pattern to a lower surface of the upper optical sheet is longer than a distance from a lowest point of the second structural pattern to a lower surface of the lower optical sheet.