Patent ID: 9667953
Date: 2017-05-30
CPC Classifications: G02B,H04N

Claim:
1. A display device for emitting a stereoscopic image with widened viewing angles at the upper and lower, and left and right edges thereof when viewed with polarizing glasses comprising a left-eye region and a right-eye region, each of which comprises a uniaxial retardation layer and a polarizer, the display device comprising: a display unit configured to generate a left-eye image signal and a right-eye image signal; and a filter unit comprising a first region and a second region respectively having retardation layers to differently control polarization states of the left-eye image signal and the right-eye image signal generated by the display unit, wherein the retardation layers of the first and second regions of the filter unit have uniaxiality with an opposite sign to the uniaxial retardation layer of the polarizing glasses, and the retardation layers of the first and second regions of the filter unit have the same wavelength dispersion characteristics, wherein the first and second regions are alternately formed adjacent to one another in stripe shapes or are alternately disposed adjacent to one another to form a grid pattern, wherein the uniaxial retardation layer is either a positive or negative uniaxial retardation layer, and wherein the positive uniaxial retardation layer satisfies Equation 1 and the negative uniaxial retardation layer satisfies Equation 2 to provide the widened viewing angles: wherein n wherein the retardation layers of the first and second regions have an in-plane retardation satisfying Equation 3 to provide the widened viewing angles: wherein R(λ) is an in-plane retardation, d is the thickness of the retardation layer, n wherein n