Glass plate and display device

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 T1, an average value of luminance within a range of the angle θ=0.7°±0.1° is taken as T2, and an average value of luminance within a range of the angle θ=−0.7°±0.1° is taken as T3, and the clarity index value T is a value calculated by the following expression (1):
• clarity index value T=1−(T2+T3)/(2×T1) 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 R1, an average value of luminance of the reflected light within a range of the angle α=0.5°±0.1° is taken as R2, and an average value of luminance of the reflected light within a range of the angle α=−0.5°±0.1° is taken as R3, the reflection image diffusiveness index value R is a value calculated by the following expression (2):
• reflection image diffusiveness index value R=(R2+R3)/(2×R1) 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 Sa;
• 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 Ss;
• the values Sa and Ss, the anti-sparkle index value S is calculated by the following expression (3):
• anti-sparkle index value S=1−(Sa/Ss) expression (3).