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US 11,237,429 B2Granted
Light guiding assembly and fabricating method thereof, backlight module and display device
AssigneeBoe Technology Group Co., Ltd.
InventorsXiandong Meng, Wei Wang, Jifeng Tan, Xiaochuan Chen, Jian Gao, Xianqin Meng
Life of this patent
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Abstract
A light guiding assembly and a fabricating method, a backlight module, and a display device are provided. The light guiding assembly includes a waveguide layer, and a coupling grating structure including at least two gratings, wherein at least one of the at least two gratings is located inside the waveguide layer, and orthographic projections of the at least two gratings on a surface of the waveguide layer at least partially overlap, the coupling grating structure being configured such that incident light propagates in the waveguide layer.
Claims14
A light guiding assembly, comprising:
- a waveguide layer;
- and
- a coupling grating structure comprising at least two gratings, wherein at least one of the at least two gratings is located inside the waveguide layer, and orthographic projections of the at least two gratings on a surface of the waveguide layer at least partially overlap,
- wherein the coupling grating structure is configured such that incident light propagates in the waveguide layer,
- wherein the waveguide layer comprises a first waveguide sub-layer, a second waveguide sub-layer, and a third waveguide sub-layer that are arranged in a stack, and the coupling grating structure comprises a first grating and a second grating,
- wherein the first grating is located on a side of the first waveguide sub-layer away from the second waveguide sub-layer,
- wherein the second waveguide sub-layer has a cavity structure configured to receive the second grating,
- wherein the first grating is configured to diffract the incident light to form first diffracted light such that at least one portion of diffraction orders of the first diffracted light satisfies total reflection conditions in the waveguide layer, and the second grating is configured to diffract light from the first grating to form second diffracted light such that at least one portion of diffraction orders of the second diffracted light satisfies total reflection conditions in the waveguide layer, and
- wherein the at least one portion of the diffraction orders of the first diffracted light and the second diffracted light comprise +/−2nd order and above.
6 more elements
A method of manufacturing a light guiding assembly, comprising:
- forming a waveguide layer;
- disposing a coupling grating structure, the coupling grating structure comprising at least two gratings, wherein at least one of the at least two gratings is located inside the waveguide layer, and orthographic projections of the at least two gratings on a surface of the waveguide layer at least partially overlap,
- the coupling grating structure being configured such that incident light propagates in the waveguide layer,
- wherein forming the waveguide layer and disposing the coupling grating structure comprise:
- disposing a first waveguide sub-layer;
- disposing a first grating on a side of the first waveguide sub-layer;
- disposing a second waveguide sub-layer on a surface of the first waveguide sub-layer away from the first grating;
- forming a cavity structure at a position of the second waveguide sub-layer opposite to the first grating;
- disposing a second grating in the cavity structure;
- and
- disposing a third waveguide sub-layer on a side of the second waveguide sub-layer away from the first waveguide sub-layer,
- wherein the first grating is configured to diffract the incident light to form first diffracted light such that at least one portion of diffraction orders of the first diffracted light satisfies total reflection conditions in the waveguide layer, and the second grating is configured to diffract light from the first grating to form second diffracted light such that at least one portion of diffraction orders of the second diffracted light satisfies total reflection conditions in the waveguide layer, and
- wherein the at least one portion of the diffraction orders of the first diffracted light and the second diffracted light comprise +/−2nd order and above.
10 more elements
A method of manufacturing a light guiding assembly, comprising:
- forming a waveguide layer;
- disposing a coupling grating structure, the coupling grating structure comprising at least two gratings, wherein at least one of the at least two gratings is located inside the waveguide layer, and orthographic projections of the at least two gratings on a surface of the waveguide layer at least partially overlap,
- the coupling grating structure being configured such that incident light propagates in the waveguide layer,
- wherein forming the waveguide layer and disposing the coupling grating structure comprise:
- disposing a first waveguide sub-layer;
- disposing a first grating on a side of the first waveguide sub-layer;
- disposing a second grating on a side of the first waveguide sub-layer away from the first grating;
- disposing a second waveguide sub-layer on a surface of the first waveguide sub-layer away from the first grating, the second waveguide sub-layer having a cavity structure configured to receive the second grating;
- and
- disposing a third waveguide sub-layer on a side of the second waveguide sub-layer away from the first waveguide sub-layer,
- wherein the first grating is configured to diffract the incident light to form first diffracted light such that at least one portion of diffraction orders of the first diffracted light satisfies total reflection conditions in the waveguide layer, and the second grating is configured to diffract light from the first grating to form second diffracted light such that at least one portion of diffraction orders of the second diffracted light satisfies total reflection conditions in the waveguide layer, and
- wherein the at least one portion of the diffraction orders of the first diffracted light and the second diffracted light comprise +/−2nd order and above.
9 more elements
Dependencies are inferred from the claim text.