Touch panel, display device, optical sheet, selection method of optical sheet, and manufacturing method of optical sheet

Abstract

To provide a touch panel capable of imparting various properties such as anti-glare properties and capable of preventing glare of image light from an ultra-high-definition display element having a pixel density of 300 ppi or more. The touch panel of the present invention is used on the front surface of a display element with a pixel density of 300ppi or more, the touch panel has an optical sheet as a structural member, the surface of the optical sheet has a concave-convex shape, and the optical sheet satisfies the following condition A- 1 and A-2, or meet certain transmission image sharpness conditions. Condition A-1: ​​Divide the uneven surface into measurement areas of 64 μm square, calculate the three-dimensional arithmetic mean roughness SRa in each measurement area, and calculate the standard deviation σ of the three-dimensional arithmetic mean roughness of the entire measurement area SRa when σ SRa 0.050 μm or less. Condition A-2: Divide the uneven surface into measurement areas of 64 μm square, calculate the three-dimensional arithmetic mean roughness SRa in each measurement area, and calculate the average SRa of the three-dimensional arithmetic mean roughness of the entire measurement area AVE When, SRa AVE 0.100 μm or more.

Description

Technical field [0001] The present invention relates to a touch panel, a display device, an optical sheet, and a method for selecting an optical sheet and a method for manufacturing an optical sheet. Background technique [0002] In recent years, portable information terminals, represented by tablet computers and smartphones, that have two-way communication functions and are equipped with transparent touch panels for information display and information input have begun to be widely spread not only in Japan but also worldwide. [0003] As a transparent touch panel, there is a resistive film type that is advantageous in terms of cost. However, in terms of enabling gesture operations such as multi-touch, and not easily damaging the image quality of ultra-high-definition display elements, capacitive touch panels, especially projection type The need for capacitive touch panels continues to expand. [0004] On the surface of the touch panel, for the purpose of preventing the reflection of...

AI Technical Summary

Problems solved by technology

[0006] However, when an optical sheet having a concave-convex structure such as an anti-glare film is used, a phenomenon (glare) in which fine brightness variations can be observed in image light due to the concave-convex structure may occur, thereby degrading the display quality. question

In particular, the problem of glare has become more serious in the ultra-high-definition display elements (pixel density of 300ppi or more) in recent years.

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