Patent ID: 6088074
Filing Date: 2000-07-11
Classification: G02B,G02F,Y10S

Abstract:
A transparent and spread illuminating apparatus closely disposed to cover a front surface of a reflection type liquid-crystal display device, in which a light source lamp is closely disposed along at least one side end surface of a transparent substrate made of a transparent material, a light reflection pattern is formed on a top surface of said transparent substrate, said light reflection pattern is formed of a plurality of recesses formed at given intervals P1 in parallel with an axial direction of said light source lamp, wherein assuming that intervals between stripes which are in parallel with said recesses in the arrangement of liquid cells of said reflection type liquid-crystal display device are P2, wherein P1 and P2 satisfy the following relation:P1:P2=1:(N+1.3) to 1:(N+1.6)orP1:P2=1:1/(N+1.6) to 1:1/(N+1.3)where N is an integer: 0, 1, 2, 3, . . . .