Patent ID: 8363181

Claim:
A dual-view display comprising: a liquid crystal panel showing a liquid crystal screen; a polarizer having a transmission axis; and a backlight device comprising: a light source; a light-guide plate guiding and diffusing a light from the light source; a diffusing sheet disposed between the light-guide plate and the liquid crystal panel; a first prism sheet disposed between the diffusing sheet and the liquid crystal panel and a second prism sheet disposed between the first prism sheet and the liquid crystal panel, wherein the first prism sheet has a prism forming surface facing the diffusing sheet and the second prism sheet has a prism forming surface facing the liquid crystal panel, and wherein there is no other prism sheet between the second prism sheet and the liquid crystal panel; and a reflective sheet; wherein the first prism sheet has a ridge line and has a tip angle ranging from 80° to 95°, and the second prism sheet has a ridge line and has a tip angle ranging from 70° to 110°, wherein the ridge line of the first prism sheet is orthogonal to the ridge line of the second prism sheet, and wherein the first prism sheet and the second prism sheet are disposed in such a way that the respective ridge lines thereof are orthogonal to each other and are rotated an angle ranging from +35° to +45° or −35° to −45° with respect to the transmission axis of the polarizer wherein the polarizer is a polarizer of reflective type.