Date

Place

Room D (Room 322)
18. Image Quality Enhancement and Metrology
August 19, 2015 (Wednesday)
16:00 ~ 18:05

[18-2]
16:25 ~ 16:50
Title:[Invited] Brightness and Color Enhancement on a Reflective Display Using a Holographic Directional Diffuser
Jian Ma, Kirby Li, Mark Phung, Chung-Po Huang, Tallis Chang, and John Hong (Qualcomm MEMS Technologies, Inc., U.S.A.)
Abstract: The principle of Brightness and Color Enhancement Hologram (BCEH) for a reflective display is based on a usage model that has an indoor light source illuminating the display at an angle (e.g., about 45o), and the viewing angle is near normal to the display surface.? For a reflective display with a specular reflection surface, such as a MEMS display (e.g., a Qualcomm�� MirasolTM display) or reflective liquid crystal display, a diffuser is required to achieve a comfortable viewing.? However, the reflection intensity of such displays drops very quickly when the viewing angle deviates from the specular direction of the illumination source.? To view the display with a sufficient brightness, the viewing angle shall be near the specular angle of the illumination (e.g., -45o), which is not the natural viewing angle.? Additionally, the image quality (e.g., contrast and color saturation) is affected at specular direction due to specular reflection from cover glass and other layers.? We present a solution of using a directional holographic film.? We show ~10X improvement of brightness over a conventional diffuser with the MirasolTM display.? We also show correction of color blue shift associated with the interferometric displays.? The BCEH principal, method of fabrication, and integration into Qualcomm�� ToqTM smartwatch will be discussed.
PDF Download

Type