Patent ID: 8547508
Filing Date: 2013-10-01
Classification: G02F

Abstract:
1. A liquid crystal display device comprising: a liquid crystal layer for performing optical modulation in accordance with an image to be displayed; and a diffusive reflecting layer for diffusively reflecting light having passed through the liquid crystal layer to the liquid crystal layer with a diffused reflected light distribution having a predetermined directivity, wherein the diffusive reflecting layer has a function of giving the reflected light a diffused reflected light distribution in which: a first range of viewing angles within which reflected light rays of luminous flux of predetermined proportion of a first total luminous flux of reflection are obtained is defined, the first total luminous flux being obtained in a specific plane including a specific direction along a principal plane of the diffusive reflecting layer and the normal to the principal plane by incident light in a direction parallel to the normal, the first range of viewing angles having the direction of the incident light as a reference angle; a second range of viewing angles within which reflected light rays of luminous flux of the predetermined proportion of a second total luminous flux of reflection are obtained is defined, the second total luminous flux being obtained by the incident light in the other plane including the other direction along the principal plane of the diffusive reflecting layer and the normal to the principal plane, the second range of viewing angles having the direction of the incident light as a reference angle; and the first range is narrower than the second range, an initial average orientation imaginary plane of the liquid crystal layer, including a typical director of liquid crystal molecules in a dark or bright state and the normal to the principal plane of the diffusive reflecting layer; is substantially parallel to the specific plane, wherein the diffusive reflecting layer has a reflecting surface showing roughness of shape based on a plurality of island-shaped outline units of depression or projection portions, and an average diameter of the units of depression or projection portions in the specific direction is greater than an average diameter in a direction substantially perpendicular to the specific direction on the principal plane of the diffusive reflecting layer, and an average pitch of the units of depression portions or the units of projection portions in the specific direction is greater than an average pitch of them in a direction substantially perpendicular to the specific direction on the principal plane of the diffusive reflecting layer.