Patent ID: 9448437
Filing Date: 2016-09-20
CPC Classification: G02F,H01L

Claim Text:
1. A display apparatus for controlling optical transmissivity, the display apparatus comprising: a transparent display device, the device having a pixel region for emitting light and a transmissive region adjacent to the pixel region for transmitting external light therethrough; a first polarizer on a first surface of the transparent display device; a first retarder between the first polarizer and the first surface of the transparent display device; a second polarizer on a second surface of the transparent display device, the first and second surfaces of the transparent display device being opposite to each other; and a conversion retarder between the second polarizer and the second surface of the transparent display device, wherein the transparent display device comprises: wherein the first polarizer linearly polarizes an incident light from an exterior or from the first retarder to transmit a first linearly polarized light therethrough, wherein the first retarder delays a phase of an incident light from the first polarizer or from the conversion retarder to transmit a first wavelength-delayed light therethrough, wherein the second polarizer linearly polarizes an incident light from exterior or from the conversion retarder to transmit a second linearly polarized light therethough, and wherein the conversion retarder delays a wavelength of an incident light from the first retarder or from the second polarizer within a range from a first phase to a second phase depending on power supplied to the conversion retarder to transmit a second wavelength-delayed light therethrough.