Touch sensor, touch panel, and image display device
A touch sensor that is excellent in contrast between black display and white display and is excellent in performance of suppressing a decrease in brightness of white display when the touch sensor is applied to an image display device and black and white display is made, as well as an image display device including the touch sensor. The touch sensor includes a substrate and a sensing electrode disposed on at least one surface side of the substrate. The substrate includes a visible light absorber, and the substrate has an internal absorbance A 1 of 0.03 or less and a parameter X of 30 m −1 or more, the internal absorbance A 1 and the parameter X being calculated with Test X.
1. A touch sensor comprising:
a substrate; and
a sensing electrode disposed on at least one surface side of the substrate,
wherein the substrate includes a visible light absorber, and
the substrate has an internal absorbance A 1 of 0.0004 to 0.03 and a parameter X of 30 to 3000 m −1 , the internal absorbance A 1 and the parameter X being calculated with Test X:
Test X: a visible light reflectance ρ 0 of a support white plate is obtained by a method described in JIS R 3106:2019; measurement light is made incident on a laminate formed by laminating the support white plate and the substrate on the substrate side of the laminate to obtain a visible light reflectance ρ x by the method described in JIS R 3106:2019; the internal absorbance A 1 of the substrate is calculated from the visible light reflectance ρ 0 and the visible light reflectance ρ x by formula (1) below; and the parameter X (m −1 ) is calculated from the calculated internal absorbance A 1 and a thickness D 1 (m) of the substrate by formula (2) below:
A 1 =−log 10 {(ρ x /ρ 0 ) 0.5 } Formula (1)
X=A 1 /D 1 . Formula (2)
2. The touch sensor according to claim 1 ,
wherein the substrate has a thickness of 10 to 110 μm.
3. The touch sensor according to claim 1 ,
wherein the visible light absorber is a black pigment, and
a content of the black pigment is 10 to 500 mass ppm with respect to a total mass of the substrate.
4. The touch sensor according to claim 1 ,
wherein the substrate has a thickness of 10 to 110 μm,
the visible light absorber is a black pigment, and
a content of the black pigment is 10 to 500 mass ppm with respect to a total mass of the substrate.
5. A touch panel comprising the touch sensor according to claim 4 .
6. An image display device comprising:
an image display element; and
the touch sensor according to claim 4 .
7. The image display device according to claim 6 further comprising a pressure sensitive adhesive layer,
wherein the image display element, the pressure sensitive adhesive layer, and the touch sensor are disposed in this order.
8. The image display device according to claim 7 ,
wherein the image display element is an organic electroluminescence display element.
9. The image display device according to claim 6 ,
wherein the image display element is an organic electroluminescence display element.
10. A touch panel comprising the touch sensor according to claim 1 .
11. An image display device comprising:
an image display element; and
the touch sensor according to claim 1 .
12. The image display device according to claim 11 further comprising a pressure sensitive adhesive layer,
wherein the image display element, the pressure sensitive adhesive layer, and the touch sensor are disposed in this order.
13. The image display device according to claim 12 ,
wherein the image display element is an organic electroluminescence display element.
14. The image display device according to claim 11 ,
wherein the image display element is an organic electroluminescence display element.