Patent ID: 7806537
Filing Date: 2010-10-05
Classification: G02B

Abstract:
1. A light guide plate, comprising: a light input surface, a light output surface adjacent to the light input surface, and a reflective surface opposite to the light output surface; two orthogonal stresses or strains existing in the light guide plate, an angle in the range more than about 0 and less than about 90 degrees between one of the two orthogonal stresses or strains and the light input surface of the light guide plate, a stress or strain difference existing between the two orthogonal stresses or strains; a phase retardation due to the stress or strain difference, the phase retardation being defined by the equations: δ represents the phase retardation value of light passing through the light guide plate twice, L represents twice the thickness of the light guide plate, C represents the stress-optical or strain-optical coefficient, Δσ represents the stress difference or strain difference, and λ represents wavelength of an incident light.