Color gamut characteristics of diffractive-light guides of near-eye augmented reality glasses
Ching-Cherng Sun,
Wen-Kai Lin,
Tsung-Hsun Yang,
Zih-Fan Chen,
Chi Sun,
Wei-Chia Su,
Shao-Kui Zhou,
Yeh-Wei Yu,
Tsung-Xian Lee,
Chih-Yuan Cheng,
Shiuan Huei Lin
Affiliations
Ching-Cherng Sun
Department of Optics and Photonics, National Central University, Chung-Li 320317, Taiwan; Department of Electrophysics, National Yang Ming Chiao Tung University, HsinChu 30010, Taiwan; Corresponding author
Wen-Kai Lin
Department of Optics and Photonics, National Central University, Chung-Li 320317, Taiwan
Tsung-Hsun Yang
Department of Optics and Photonics, National Central University, Chung-Li 320317, Taiwan
Zih-Fan Chen
Department of Electrophysics, National Yang Ming Chiao Tung University, HsinChu 30010, Taiwan
Chi Sun
Department of Electrophysics, National Yang Ming Chiao Tung University, HsinChu 30010, Taiwan
Wei-Chia Su
Graduate Institute of Photonics, National Changhua University of Education, Changhua 50074, Taiwan
Shao-Kui Zhou
Graduate Institute of Photonics, National Changhua University of Education, Changhua 50074, Taiwan
Yeh-Wei Yu
Department of Optics and Photonics, National Central University, Chung-Li 320317, Taiwan
Tsung-Xian Lee
Graduate Institute of Color and Illumination Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
Chih-Yuan Cheng
Department of Optics and Photonics, National Central University, Chung-Li 320317, Taiwan
Shiuan Huei Lin
Department of Electrophysics, National Yang Ming Chiao Tung University, HsinChu 30010, Taiwan; Corresponding author
Summary: We delve into the distinctive color gamut characteristics resulting from color dispersion of surface relief grating (SRG) and wavelength degeneracy of volume holographic optical element (VHOE) in a diffractive light guide. While a laser-like spectrum achieves an impressive 194% sRGB color gamut for both cases, it proves unsuitable for VHOE light guides due to limitations in breaking the field of view (FOV) of the display. Conversely, a broad-band light source, such as LEDs, offers continuous FOV but reduces the common color gamut to 50% sRGB. We then present a newly designed VHOE light guide capable of achieving the common color gamut of 130% sRGB using two multiplexed holograms of each color, closely matching the 133% sRGB achieved by an SRG light guide. This article presents the first theoretical methodology to elucidate color performance of diffractive light guides utilizing VHOEs with holographic multiplexing, affirming their suitability for crafting high-quality near-eye display.
