Patent ID: 6693690
Filing Date: 2004-02-17
Classification: G02B,G02F

Abstract:
A reflective liquid-crystal display device comprising:a reflective liquid-crystal display panel including a liquid-crystal cell and light-reflecting means, said liquid-crystal cell having a back-side cell substrate made of a support substrate containing at least an electrode, a visual-side cell substrate made of a transparent substrate containing at least a transparent electrode, and a layer of liquid crystal between the two cell substrates disposed so that the electrode sides of the two cell substrates face each other, said light-reflecting means being located on a back side with respect to said liquid-crystal layer of said cell, said reflective liquid-crystal display panel being formed in a manner such that external light incident on an outer surface of said visual-side cell substrate is reflected by said light-reflecting means so that display light transmitted through said liquid-crystal layer is made to emerge from said visual-side cell substrate and viewed; at least one light source disposed on at least one of side surfaces of said reflective liquid-crystal display panel; an optical path control layer having a thickness in a range of from 10 to 300 &mgr;m and disposed on an outer surface side of said visual-side cell substrate, said optical path control layer including light output means formed by arrangement of a plurality of fine grooves each made of a concave portion shaped like an approximate triangle in section, each of said fine grooves being having a length of not larger than 250 &mgr;m and a depth of not larger than 50 &mgr;m, the depth being not larger than &frac15; as large as the length, each of said fine grooves having an optical path changing slope, and a steep slope facing said optical path changing slope, said optical path changing slopes being provided so that light incident on said side surface from said light source is reflected toward said back-side cell substrate side, each of said optical path changing slopes being inclined at an inclination angle in a range of from 35 to 48 degrees to a reference plane of said liquid-crystal display panel, each of said steep slopes being inclined at an inclination angle of not lower than 60 degrees to said reference plane; a transparent adhesive layer; and a transparent touch panel provided with a mechanism for detecting an input position and bonded to an outer side of said optical path control layer through said transparent adhesive layer.