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CN-121254406-B - Optical diffusion sheet, optical system and electronic device comprising same

CN121254406BCN 121254406 BCN121254406 BCN 121254406BCN-121254406-B

Abstract

The application discloses an optical diffusion sheet, an optical system and electronic equipment comprising the optical diffusion sheet, the optical diffusion sheet comprises a substrate and micro lenses, the micro lenses are prepared from optical glue and positioned on the first surface of the substrate, wherein the optical glue comprises modified acrylic resin with rigid groups and a diluent monomer, the optical diffusion sheet meets at least two conditions that the FOV change rate is less than or equal to 3% in a 105 ℃ high-temperature 72h environment, the FOV change rate is less than or equal to 5% in a-40 ℃ low-temperature 72h environment, the FOV change rate is less than or equal to 8% in a double-85 ℃ 72h environment, and the FOV change rate is less than or equal to 4% in a 40 ℃ to 105 ℃ thermal shock 72h environment. Compared with glue before adjustment, the optical diffusion sheet has small change of the angle of view/diffusion angle (FOV) value under the test environment of various reliabilities, and accords with high-end application development of AR/VR, vehicle-mounted HUD and the like.

Inventors

  • DONG XIN
  • LEI FUQING
  • HUANG HUJUN

Assignees

  • 宁波舜宇车载光学技术有限公司

Dates

Publication Date
20260512
Application Date
20251205

Claims (14)

  1. 1. An optical diffusion sheet, comprising: a substrate, and The micro lens is formed by solidifying optical glue through light irradiation and is positioned on the first surface of the substrate; The optical glue comprises modified acrylic resin with rigid groups and a diluting monomer; the optical diffusion sheet satisfies at least two conditions: the change rate of the FOV is less than or equal to 3% in the environment of 105 ℃ and 72 h; The change rate of the FOV is less than or equal to 5% in the environment of-40 ℃ and 72 h; the change rate of the FOV is less than or equal to 8% in a double-85 ℃ 72h environment; FOV change rate is less than or equal to 4% in a thermal shock 72h environment at-40 ℃ to 105 ℃; wherein the diluent monomer comprises a monofunctional monomer and a multifunctional monomer; the monofunctional monomer is a monofunctional monomer containing a ring-shaped rigid group; the annular rigid group comprises one or more of aromatic rings, cyclic aliphatic rings and heterocyclic rings; the multifunctional monomer contains a component of a soft segment; The monofunctional monomer does not contain hydroxyl, ether bond and silane groups, and the multifunctional monomer does not contain hydroxyl, ether bond and silane groups.
  2. 2. The optical diffuser of claim 1 wherein the young's modulus of the microlens is 3.0 Gpa to 5.0Gpa.
  3. 3. The optical diffuser of claim 1, wherein the optical diffuser satisfies at least two of the following conditions: The FOV change rate is less than or equal to 3% under the condition of 105-500 h, less than or equal to 5% under the condition of-40-500 h, less than or equal to 8% under the condition of double-85-500 h, and less than or equal to 4% under the condition of-40-105-500 h.
  4. 4. The optical diffuser of claim 1, wherein the optical diffuser satisfies at least two of the following conditions: The FOV change rate is less than or equal to 6% in the environment of 105 ℃ and 1000h, less than or equal to 6% in the environment of-40 ℃ and 1000h, less than or equal to 10% in the environment of double 85 ℃ and 1000h, and less than or equal to 4.5% in the environment of-40 ℃ to 105 ℃ thermal shock and 1000 h.
  5. 5. The optical diffuser of claim 1 wherein the monofunctional monomer is used to increase the anti-deformation capability of the microlens; the multifunctional monomer is used for improving the hardness of the micro lens.
  6. 6. The optical diffuser of claim 5 wherein the multifunctional monomer is used to increase microlens toughness.
  7. 7. The optical diffuser of claim 5 wherein the monofunctional monomer is 30-35% by mass of the microlens, the multifunctional monomer is 15-30% by mass of the microlens, and the diluent monomer is 45-80% by mass of the microlens optical cement.
  8. 8. The optical diffusion sheet according to any one of claims 1 to 7, wherein the modified acrylic resin having a rigid group comprises one or more of a modified epoxy acrylic resin, a modified urethane acrylic resin, a polyester acrylic resin, and a polyether acrylic resin.
  9. 9. The optical diffuser of claim 1 wherein the monofunctional monomer comprises one or more of tetrahydrofuranacrylate, 2-phenoxyethyl acrylate, 2-acrylic acid-2- ([ 1,1' -biphenyl ] -2-oxy) ethyl ester, isobornyl acrylate; The multifunctional monomer comprises one or more of tripropylene glycol diacrylate and 1, 6-hexanediol diacrylate.
  10. 10. The optical diffuser of claim 1 wherein the peel force of the microlenses with respect to the substrate is greater than or equal to 5N/mm 2 .
  11. 11. The optical diffusion sheet according to claim 1, wherein the microlens satisfies at least two characteristics of a glass transition temperature of 85 ℃ to 130 ℃, an elongation at break of 25% or more of 10% or more, a water absorption of 2% or less after soaking in pure water at 25 ℃ for 24 hours, a transmittance of 90% or more, a haze of 1% or less, a pencil hardness of HB, a refractive index of 1.47 to 1.55, a thermal expansion coefficient of 30ppm/K to 200ppm/K, and a transmittance decrease of 1% or less after 1000 hours of SAEJ2527 standard irradiation.
  12. 12. An optical system comprising the optical diffusion sheet according to any one of claims 1 to 11, and An optical lens.
  13. 13. The optical system of claim 12, further comprising: The optical lens is positioned between the optical diffusion sheet and the light source.
  14. 14. An electronic device comprising an optical system as claimed in claim 12 or 13.

Description

Optical diffusion sheet, optical system and electronic device comprising same Technical Field The application relates to the technical field of optical systems, in particular to an optical diffusion sheet, an optical system comprising the optical diffusion sheet and electronic equipment. Background Optical diffusers (diffusers) are key components of display and illumination systems, and find important applications in flat panel display, laser, LED lighting, imaging, and other systems. Based on the difference of diffusion principles of incident light waves, the light source is mainly divided into two types, one type is doped particle type, and the other type is surface microstructure type. The former is widely used in flat panel display at present, but has low transmittance, uncontrollable optical field, uneven optical field and hot spot due to uneven doping. The latter type realizes uniform scattering of light rays through a surface microstructure, and the core parameter field angle/diffusion angle (FOV) directly influences the light field distribution precision of an optical system. Including frosted glass type, hologram type and microlens array type. The micro-lens array diffusion sheet has high transmittance, can adjust diffusion angles, space and energy distribution of a light field by changing the shape and arrangement of the micro-lens array, and has great flexibility. And thus have attracted considerable attention from researchers. Along with the development of high-end applications such as AR/VR, on-vehicle HUD, the reliability requirement of the optical diffusion sheet is higher and higher, and after the traditional optical diffusion sheet manufacturing reliability test is carried out on a vehicle-gauge level, the FOV value change is larger, and the requirements are difficult to meet. Disclosure of Invention In order to solve the above-mentioned shortcomings in the art, the present application is directed to an optical diffusion sheet, and an optical system and an electronic device including the optical diffusion sheet. According to an aspect of the present application, there is provided an optical diffusion sheet comprising: a substrate, and The micro lens is formed by light irradiation and solidification of optical glue and is positioned on the first surface of the substrate; The optical glue comprises modified acrylic resin with rigid groups and a diluting monomer; The optical diffusion sheet satisfies at least two conditions: the change rate of the FOV is less than or equal to 3 percent under the environment of high temperature of 105 ℃ and 72 hours; The change rate of the FOV is less than or equal to 5 percent in the environment of-40 ℃ low temperature 72 h; the change rate of the FOV is less than or equal to 8% in a double-85 ℃ 72h environment; the FOV change rate is less than or equal to 4 percent under the thermal shock 72h environment at the temperature of 40 ℃ below zero to 105 ℃. According to some embodiments of the application, the Young's modulus of the microlens is 3.0 GPa-5.0 GPa. According to some embodiments of the application, the optical diffusion sheet satisfies at least two of the following conditions: The FOV change rate is less than or equal to 3% under the conditions of 105 ℃ and 500h, less than or equal to 5% under the conditions of-40 ℃ and 500h, less than or equal to 8% under the conditions of double 85 ℃ and 500h, and less than or equal to 4% under the conditions of-40 ℃ to 105 ℃ and 500h. According to some embodiments of the application, the optical diffusion sheet satisfies at least two of the following conditions: the FOV change rate is less than or equal to 6% under the conditions of high temperature of 105 ℃ and 1000h, the FOV change rate is less than or equal to 6% under the conditions of low temperature of 40 ℃ and 1000h, the FOV change rate is less than or equal to 10% under the conditions of double temperature of 85 ℃ and 1000h, and the FOV change rate is less than or equal to 4.5% under the conditions of thermal shock of 40 ℃ to 105 ℃ and 1000 h. According to some embodiments of the application, the diluent monomer includes a monofunctional monomer and a multifunctional monomer; according to some embodiments of the application, the monofunctional monomer is a monofunctional monomer containing a ring-shaped rigid group for increasing the deformation resistance of the microlens; The polyfunctional monomer serves to increase the hardness of the microlens. According to some embodiments of the application, the ring-shaped rigid group comprises one or more of aromatic rings, cycloaliphatic rings, heterocyclic rings. According to some embodiments of the application, the aromatic ring may be one or more of benzene ring, biphenyl, naphthalene ring, the cyclic aliphatic may be one or more of cyclohexane, norbornene, adamantane, and the heterocyclic ring may be one or more of furan, thiophene, imidazole. According to some embodiments of the application, the multifunctiona