Abstract: There is provided an optical device including a display device, and a transparent substrate that is disposed on a side of a display surface of the display device. When the transparent substrate is evaluated by using a three index values of a resolution index value T, a reflection image diffusiveness index value R, and a sparkle index value S, the following conditions are satisfied: the resolution index value T?0.2, the reflection image diffusiveness index value R?0.2, and the sparkle index value S?60.

Abstract: The present invention is a method of evaluating optical characteristics of a transparent substrate that is disposed on a display device, wherein the optical characteristics of the transparent substrate are evaluated by selecting two values among a quantified resolution index value (T), a quantified reflection image diffusiveness index value (R), and a quantified sparkle index value of the transparent substrate. According to the present invention, a transparent substrate and an anti-glare process that is to be applied to it can be properly selected, depending on purpose and use. The present invention can be utilized, for example, for evaluating optical characteristics of a transparent substrate that is installed in various types of display devices, such as an LCD device, an OLED device, a PDP device, and a tablet type display device.

Abstract: A method of evaluating an operational feel of a substrate includes a step of preparing a substrate having a first surface; a step of measuring a plurality of kinetic friction coefficients ? (?1, . . . , ?N, where N is an integer greater than or equal to 2) of the first surface of the substrate, using a tactile contact, under different combinations of a friction speed and a load selected from at least one friction speed within a range from 1 mm/sec to 100 mm/sec and at least two loads within a range from 0.098 N to 1.960 N; a step of obtaining a standard deviation ? and an average value ?ave of the plurality of kinetic friction coefficients ? that have been measured; and a step of determining at least one of whether the standard deviation ? satisfies ?<0.5 and whether the average value ?ave satisfies ?ave<1.4.

Abstract: A method for evaluating optical characteristics of a transparent substrate including first and second surfaces and being positioned on a display surface side of a display device. The method includes evaluating the optical characteristics of the transparent substrate by using two index values including a quantified resolution index value of the transparent substrate and a quantified reflected-image diffusibility index value.

Abstract: The present invention is a method of evaluating optical characteristics of a transparent substrate that is disposed on a display device, wherein the optical characteristics of the transparent substrate are evaluated by selecting two values among a quantified resolution index value (T), a quantified reflection image diffusiveness index value (R), and a quantified sparkle index value of the transparent substrate. According to the present invention, a transparent substrate and an anti-glare process that is to be applied to it can be properly selected, depending on purpose and use. The present invention can be utilized, for example, for evaluating optical characteristics of a transparent substrate that is installed in various types of display devices, such as an LCD device, an OLED device, a PDP device, and a tablet type display device.

Abstract: There is provided an optical device including a display device, and a transparent substrate that is disposed on a side of a display surface of the display device. When the transparent substrate is evaluated by using a three index values of a resolution index value T, a reflection image diffusiveness index value R, and a sparkle index value S, the following conditions are satisfied: the resolution index value T?0.2, the reflection image diffusiveness index value R?0.2, and the sparkle index value S?60.