Glass plate and display device

Patent metadata

Field	Value
Publication number	US-10816840-B2
Application number	US-201916251396-A
Country	US
Kind code	B2
Filing date	Jan 18, 2019
Priority date	Jan 18, 2018
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

The present invention relates to a glass plate including a first main surface subjected to antiglare treatment, and a second main surface opposed to the first main surface, in which a clarity index value T, a reflection image diffusiveness index value R and an anti-sparkle index value S satisfy respective relations of: clarity index value T≥0.8; reflection image diffusiveness index value R≥0.01; and anti-sparkle index value S≥0.85; and a transmission haze measured by a method according to JIS K 7136 (2000) being 15% or less. The glass plate of the present invention is excellent in clarity, reflection image diffusiveness and anti-sparkle, and also excellent in reproducibility of color.

First claim

The invention claimed is:

1. A glass plate comprising a first main surface subjected to antiglare treatment, and a second main surface opposed to the first main surface, wherein:
a clarity index value T, a reflection image diffusiveness index value R and an anti-sparkle index value S quantified by methods shown below satisfy respective relations of:
clarity index value T≥0.8;
reflection image diffusiveness index value R≥0.01; and
anti-sparkle index value S≥0.85; and
a transmission haze measured by a method according to JIS K 7136 (2000) is 15% or less,
wherein:
clarity index value T: when a direction parallel to a thickness direction of the glass plate is regarded as an angle θ=0°, an average value of luminance within a range of the angle θ=0°±0.1° is taken as T 1 , an average value of luminance within a range of the angle θ=0.7°±0.1° is taken as T 2 , and an average value of luminance within a range of the angle θ=−0.7°±0.1° is taken as T 3 , and the clarity index value T is a value calculated by the following expression (1):
clarity index value T= 1−( T 2 +T 3 )/(2× T 1 )  expression (1),

reflection image diffusiveness index value R: when a direction parallel to the thickness direction of the glass plate is regarded as an angle ϕ=0°, the light is radiated from an angle ϕ=5.7°±0.1°, and the angle ϕ=−5.7° at specular reflection is regarded as reference (an angle α=0°), an average value of luminance of the reflected light within a range of the angle α=0°±0.1° is taken as R 1 , an average value of luminance of the reflected light within a range of the angle α=0.5°±0.1° is taken as R 2 , and an average value of luminance of the reflected light within a range of the angle α=−0.5°±0.1° is taken as R 3 , the reflection image diffusiveness index value R is a value calculated by the following expression (2):
reflection image diffusiveness index value R =( R 2 +R 3 )/(2× R 1 )  expression (2),

anti-sparkle index value S: when the glass plate is disposed so that the second main surface of the glass plate contacts with a display surface side of a display device with a resolution of 264 ppi; with a single-color image of green composed of RGB (0, 255, 0) being displayed on the display device, a sparkle value is obtained by image analysis, the sparkle value obtained as sparkle S a ; a distance d between a solid-state image sensor and the glass plate is set at 540 mm, and as a camera lens, lens having a focal length of 50 mm is used with an aperture of 5.6; a glass substrate having the same thickness as the aforementioned glass plate is also used as a reference sample, and image analysis is performed under similar conditions; a sparkle value thus obtained is regarded as S s ; the values S a and S s , the anti-sparkle index value S is calculated by the following expression (3):
anti-sparkle index value S= 1−( S a /S s )  expression (3).

2. The glass plate according to claim 1 , wherein:
the clarity index value T, the reflection image diffusiveness index value R and the anti-sparkle index value S satisfy respective relations of:
the clarity index value T≥0.85;
the reflection image diffusiveness index value R≥0.02; and
the anti-sparkle index value S≥0.88; and
the transmission haze is 7% or less.

3. The glass plate according to claim 1 , wherein an antireflection layer is provided on at least a part of the first main surface.

4. The glass plate according to claim 1 , wherein an antifouling layer is provided on an outermost surface of the first main surface side.

5. The glass plate according to of claim 1 , wherein a printed layer is provided on at least a part of the second main surface.

6. The glass plate according to claim 1 , wherein the glass plate is soda-lime glass or aluminosilicate glass.

7. The glass plate according to claim 1 , wherein at least one of the first main surface and the second main surface is subjected to chemically strengthening treatment.

8. The glass plate according to claim 1 , wherein a bent portion is provided in at least one of the first main surface and the second main surface.

9. A display device comprising the glass plate according to claim 1 , and a light emitting body.

Assignees

• Agc Inc

Inventors

• Tamada Minoru
• Kobayashi Yusuke

Classifications

• G02F1/133502 Primary

  Antiglare, refractive index matching layers · CPC title

• G02F1/133331

  Cover glasses · CPC title

• G02B27/01

  Head-up displays · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• G02B5/00

  Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) · CPC title