Chinese Journal of Liquid Crystals and Displays, Volume. 39, Issue 5, 646(2024)
Polarized light multiplexing liquid crystal grating waveguide for AR near-eye display systems
Fig. 1. （a）Schematic diagram of PVG structure；（b）Diffraction characteristics of reflective PVG.
Fig. 2. （a）Schematic diagram of the PVG waveguide structure designed in this paper；（b）Schematic representation of the FOV calculation method in k-space.
Fig. 3. （a）Structure of optical path for μLED pico-projection lens；（b）MTF curves of the μLED pico-projection lens；（c）Field curve and distortion curve of the μLED pico-projection lens.
Fig. 4. （a）Waveguide model in non-sequential patterns；（b）Top view of the PVG waveguide structure；（c）Irradiance image responded to only one circularly polarized light；（d）Irradiance image of the waveguide configuration in Fig.4（b）.
Fig. 6. （a）Appearance of the prepared PVG waveguides；（b）Experimental setup for the proposed virtual image observation system；（c）Display effect diagram under ambient light.
Fig. 7. （a）Uniformity test results of the control group at the incident wavelength of 532 nm；（b）Uniformity test results of the waveguide at the incident wavelength of 532 nm presented in this paper.
Table 1. Each surface data of the μLED pico-projection lens
View tableView in ArticleTable 1. Each surface data of the μLED pico-projection lens
Surface Type Radius/mm Thickness/mm Glass Semi-aperture OBJ Standard ∞ 15.03 5.00 1 Standard 9.70 0.55 HZF6_CDGM 1.92 2 Standard -11.61 0.10 1.88 3 Standard 2.22 0.87 HZF6_CDGM 1.44 4 Standard 3.46 0.36 1.09 5 Standard -6.08 0.20 HQK3L_CDGM 0.98 6 Standard 1.66 0.29 0.77 STO Standard ∞ 0.68 0.67 8 Standard 7.28 0.46 HZF6_CDGM 1.05 9 Standard -3.61 3.24 1.10 IMA Standard ∞ 0.00 1.65
Table 2. Parameter design results for the pico-projection lens
View tableView in ArticleTable 2. Parameter design results for the pico-projection lens
Parameter Specifications Number of lenses ≤4 Image height/mm 1.65 Object height/mm 5 FOV ±15° Wavelength/nm 532 MTF >0.6@121 lp/mm
Table 3. Irradiance（unit：10-5 W/cm2）and spatial uniformity
View tableView in ArticleTable 3. Irradiance（unit：10-5 W/cm2）and spatial uniformity
No. I1 I2 I3 I4 I5 I6 I7 I8 I9 Spatial uniformity Fig.4 （c）13.09 6.737 3.446 13.94 7.196 3.658 13.07 6.727 3.443 0.247 Fig.4 （d）6.811 5.328 4.056 7.308 5.564 4.193 6.788 5.319 4.058 0.555
Table 4. Mass fraction of materials for PVG-couplers
View tableView in ArticleTable 4. Mass fraction of materials for PVG-couplers
耦合器件 RM257 R5011 S5011 Irgacure 651 In-coupling PVG1 92.7 2.30 5 In-coupling PVG2 92.7 2.30 5 Out-coupling PVG1 92.7 2.30 5 Out-coupling PVG2 92.7 2.30 5
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Zijian LIN, Lisheng YAO, Huajian JIN, Jianbin QIU, Yun YE, Sheng XU, Qun YAN, Tailiang GUO, Wanlong ZHANG, Enguo CHEN. Polarized light multiplexing liquid crystal grating waveguide for AR near-eye display systems[J]. Chinese Journal of Liquid Crystals and Displays, 2024, 39(5): 646
Category: Research Articles
Received: Jan. 25, 2024
Accepted: --
Published Online: Jul. 8, 2024
The Author Email: Wanlong ZHANG (zwl@szu.edu.cn), Enguo CHEN (ceg@fzu.edu.cn)
