Abstract
We propose a systematic optimization method for two commonly used display devices, organic light-emitting diode (OLED) display and liquid crystal display (LCD), for virtual reality (VR) headsets. An optical simulation model for the VR system is established, and three performance metrics, namely total light efficiency (TLE), field color gamut coverage, and field color non-uniformity, are proposed as the optimization objectives. For the RGB (red, green, and blue) OLED display, the microcavity structure is optimized to suppress the field color unevenness while maintaining a high TLE and large field color gamut coverage. For the direct-lit LCD, the optimization is from the viewpoint of entire VR system. A two-dimensional patterned prism film is implemented in the backlight unit to locally modulate the radiation pattern of the LCD. Thus, the vignetting effect in the VR system is alleviated and the TLE is further enhanced by 40%. After optimizing the OLED display and LCD, their pros and cons in the VR systems are analyzed. Our optimization method is proven to be effective for designing a proper display panel for VR systems.
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