A display apparatus is provided. The display apparatus comprises a display device for displaying an image and a diffractive optical element. The diffractive optical element is disposed on a light emitting side of the display device. The diffractive optical element comprises first grating regions. Each of the first grating regions has first diffraction gratings having a constant cycle space and the same azimuth angle. An area of the first grating regions occupies 17.5%˜94% of an area of the diffractive optical element.
申请公布号
US2012249924(A1)
申请公布日期
2012.10.04
申请号
US201213435323
申请日期
2012.03.30
申请人
LI WANG-YANG;WU TING-I;TSAI HUAI-FANG;LEE WAI-HON;CHI MEI CORPORATION;FINITY LABORATORIES;KLASER TECHNOLOGY INC.;CHI MEI VISUAL TECHNOLOGY CORPORATION