Glass light guiding plate

Patent metadata

Field	Value
Publication number	US-10207950-B2
Application number	US-201615744728-A
Country	US
Kind code	B2
Filing date	Sep 26, 2016
Priority date	Sep 25, 2015
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A glass light-guiding plate which has high-temperature stability and is advantageous in being manufactured in a slim profile is provided. The glass light-guiding plate includes a glass plate including 75 to 85 wt % SiO 2 , 5 to 20 wt % B 2 O 3 , 1 to 5 wt % Al 2 O 3 , 3 to 8 wt % R 2 O (here, R is at least one of Li, Na, and K), and Fe 2 O 3 <0.0025 wt %.

First claim

What is claimed is:

1. A glass light-guiding plate comprising a glass plate comprising:
80 to 85 wt % SiO 2 ;
5 to 20 wt % B 2 O 3 ;
1 to 5 wt % Al 2 O 3 ;
3 to 8 wt % R 2 O where R is at least one of Li, Na, and K; and
Fe 2 O 3 in an amount <0.0025 wt %,
wherein the only oxides present in the glass plate are SiO 2 , B 2 O 3 , Al 2 O 3 , and R 2 O where R is at least one of Li, Na, and K, and Fe 2 O 3 .

2. The glass light-guiding plate of claim 1 , wherein the glass plate further comprises 0 to 0.5 wt % SO 3 or Cl as a clarifier.

3. The glass light-guiding plate of claim 2 , wherein sum of contents of SiO 2 , B 2 O 3 , Al 2 O 3 , R 2 O, Fe 2 O 3 , SO 3 , and Cl in the glass plate is 100 wt %.

4. The glass light-guiding plate of claim 1 , wherein the glass plate comprises K 2 O>0.1 wt %.

5. The glass light-guiding plate of claim 1 , wherein the glass plate with a thickness of 2 mm has transmittance of 92.5% or more for visible light (380 nm to 780 nm).

6. The glass light-guiding plate of claim 1 , wherein the glass plate has a refractive index of 1.49 or less.

7. The glass light-guiding plate of claim 1 , wherein the glass plate has a thickness of 2 mm or less.

8. The glass light-guiding plate of claim 1 , wherein the glass plate comprises a compression stress layer on a surface thereof in which glass having the above composition is chemically reinforced.

9. A backlight unit comprising the glass light-guiding plate of claim 1 .

10. A display device comprising the glass light-guiding plate of claim 1 .

11. A method of manufacturing a glass light-guiding plate, the method comprising:
combining and melting glass raw materials such that the glass raw materials comprise:
80 to 85 wt % SiO 2 ;
5 to 20 wt % B 2 O 3 ;
1 to 5 wt % Al 2 O 3 ;
3 to 8 wt % R 2 O where R is at least one of Li, Na, and K; and
Fe 2 O 3 in an amount <0.0025wt %,

wherein the only oxides present are SiO 2 , B 2 O 3 , Al 2 O 3 , R 2 O where R is at least one of Li, Na, and K, and Fe 2 O 3 ; and
forming the molten glass raw materials as a glass plate.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Chang-Hee
• Shim Hyun-Jin
• Choi Byung-Kook
• Choi Jun-Bo

Classifications

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• C03C13/046 Primary

  Multicomponent glass compositions · CPC title

• G02F1/133524

  Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides · CPC title