Patent ID: 8488073
Filing Date: 2013-07-16
Classification: G02B,G02F

Abstract:
1. An autostereoscopic image display apparatus comprising: a plane display device comprising pixels arranged in a matrix form; and an optical plate provided in front of the plane display device to control light rays illuminated from the pixels, the optical plate including: first and second substrates, each being transparent to light; liquid crystal sandwiched between the first substrate and the second substrate; first electrodes arranged periodically on a first plane of the first substrate opposed to the second substrate and supplied with a first voltage; second electrodes disposed on the first plane of the first substrate and between first electrodes adjacent and supplied with a second voltage which is lower than the first voltage; a third electrode provided on a second plane of the second substrate opposed to the first substrate and supplied with a third voltage which is equal to or less than the second voltage; and at least one spacer provided between the first substrate and the second substrate to hold a space between the first substrate and the second substrate, wherein denoting a refractive index of the liquid crystal in a director direction by Ne, denoting a refractive index of the liquid crystal in a direction perpendicular to the director direction by No, and denoting a refractive index of the spacer by ns, the spacer is disposed on the first electrode if a condition is satisfied.