Patent ID: 10649561

Abstract:
A multilayer structure includes a touch sensor and an optical functional layer formed thereon. The optical functional layer includes a phase-difference layer and a linear polarization layer formed thereon on a side opposite to the touch sensor. The phase-difference layer which gives a phase difference to transmitted light has a laminated structure including a 1/4λ phase-difference layer and a 1/2λ phase-difference layer. The multilayer structure has first and second retardations at wavelengths of 450 nm and 590 nm, respectively, while the optical functional layer has third and fourth retardations at wavelengths of 450 nm and 590 nm, respectively. A first ratio of the first retardation to the second retardation is smaller than 0.763 and greater than a second ratio of the third retardation to the fourth retardation. A slow axis of the base member extends in a direction parallel to a synthesized slow axis of the optical functional layer.