US 12,405,445 B2
Optical system and VR display device
Jiarong Bai, Beijing (CN); Ruijun Dong, Beijing (CN); Yulong Wu, Beijing (CN); Chenru Wang, Beijing (CN); Ke Li, Beijing (CN); Na Han, Beijing (CN); Zhanshan Ma, Beijing (CN); and Lili Chen, Beijing (CN)
Assigned to BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Appl. No. 17/920,132
Filed by BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
PCT Filed Nov. 25, 2021, PCT No. PCT/CN2021/133282
§ 371(c)(1), (2) Date Oct. 20, 2022,
PCT Pub. No. WO2023/092421, PCT Pub. Date Jun. 1, 2023.
Prior Publication US 2024/0219684 A1, Jul. 4, 2024
Int. Cl. G02B 9/10 (2006.01)
CPC G02B 9/10 (2013.01) 19 Claims
OG exemplary drawing
 
1. An optical system, having an optical axis, the optical system comprising a positive focal power lens, a negative focal power lens and a display that are sequentially arranged along the optical axis, wherein
the positive focal power lens includes a first convex surface that is away from the display and a second convex surface that is proximate to the display, and the first convex surface and the second convex surface are both outwardly convex with respect to an optical center of the positive focal power lens; the negative focal power lens includes a third convex surface that is away from the display and a fourth concave surface that is proximate to the display, the third convex surface is outwardly convex with respect to an optical center of the negative focal power lens, and the fourth concave surface is inwardly concave with respect to the optical center of the negative focal power lens;
for a refractive index of the positive focal power lens and a refractive index of the negative focal power lens, one refractive index is greater than another refractive index, a greater refractive index is a first refractive index, a smaller refractive index is a second refractive index, the first refractive index is greater than 1.7, the second refractive index is greater than 1.5, and a ratio of the first refractive index to the second refractive index is less than or equal to 2;
wherein a focal power of the positive focal power lens is in a range from 0.05 mm−l to 0.15 mm−1, inclusive;
the refractive index of the positive focal power lens is greater than the refractive index of the negative focal power lens.