WO2020259374A1 - 光转换结构、背光装置及虚拟现实显示装置 - Google Patents

光转换结构、背光装置及虚拟现实显示装置 Download PDF

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Publication number
WO2020259374A1
WO2020259374A1 PCT/CN2020/096661 CN2020096661W WO2020259374A1 WO 2020259374 A1 WO2020259374 A1 WO 2020259374A1 CN 2020096661 W CN2020096661 W CN 2020096661W WO 2020259374 A1 WO2020259374 A1 WO 2020259374A1
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Prior art keywords
light
incident
angle
prism
prism structure
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PCT/CN2020/096661
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English (en)
French (fr)
Inventor
金亮亮
马若玉
杨泽洲
孙海威
吴忠宝
廖川东
Original Assignee
京东方科技集团股份有限公司
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Priority to US17/254,829 priority Critical patent/US11982904B2/en
Publication of WO2020259374A1 publication Critical patent/WO2020259374A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis

Definitions

  • the present disclosure relates to the technical field of display product manufacturing, in particular to a light conversion structure, a backlight device and a virtual reality display device.
  • Virtual reality (Virtual Reality, VR) technology is a brand-new practical technology developed in the 20th century.
  • Virtual reality technology includes computer, electronic information, and simulation technology. Its basic realization method is that the computer simulates the virtual environment to give people a sense of environmental immersion.
  • the embodiments of the present disclosure provide a light conversion structure, including:
  • a transparent substrate comprising a first surface and a second surface that are opposed to each other;
  • a plurality of first prism structures are arranged in an array on the first surface, and each of the first prism structures includes a first light-incident surface and a second light-incident surface that are adjacent or opposite to each other.
  • the light surface is used to receive first incident light from a first direction
  • the second light incident surface is used to receive second incident light from a second direction;
  • a plurality of second prism structures are arranged in an array on the second surface, and a plurality of the second prism structures are arranged in a one-to-one correspondence with a plurality of the first prism structures, and each of the second prism structures includes A first light-emitting surface and a second light-emitting surface that are adjacently or oppositely arranged;
  • the first incident light enters the first prism structure from the first light incident surface, passes through the transparent substrate, and the second prism structure corresponding to the first prism structure can be Exit from the first light exit surface at a preset angle;
  • the second incident light enters the first prism structure from the second light incident surface, passes through the transparent substrate, and the second prism structure corresponding to the first prism structure can be Exit from the second light exit surface at a second preset angle;
  • the difference between the first preset angle and the second preset angle is less than a preset value.
  • the first preset angle is the angle between the light emitted from the first light-emitting surface and a direction perpendicular to the second surface
  • the second preset angle is from the first light-emitting surface.
  • the included angle between the light emitted from the two light-emitting surfaces and the direction perpendicular to the second surface, the first predetermined angle and the second predetermined angle are the same.
  • the first prism structures in each row or each column are symmetrically arranged with respect to the row-direction center or the column-direction center;
  • the second prism structures in each row or each column are symmetrically arranged with respect to the row-direction center or the column-direction center.
  • the first prism structure includes the first light-incident surface and the second light-incident surface that are adjacently disposed, and a first connection surface disposed on the transparent substrate, and the first The light incident surface and the second light incident surface are both connected to the first connecting surface, and the second prism structure includes the first light emitting surface and the second light emitting surface arranged adjacently, and the The second connecting surface on the transparent substrate, the first light-emitting surface and the second light-emitting surface are both connected with the second connecting surface;
  • the first incident light is incident into the first prism structure from the first light incident surface, and is totally reflected inside the second light incident surface, and then exits the first light exit surface;
  • the second incident light enters the first prism structure from the second light incident surface, and is totally reflected inside the first light incident surface, and then exits the second light exit surface.
  • the refractive indexes of the first prism structure and the second prism structure are the same.
  • the exit angle of the light emitted from the first light exit surface satisfies the following formula:
  • ⁇ 12 is the angle between the light emitted from the first light-emitting surface and the direction perpendicular to the second surface
  • ⁇ 4 is the angle between the first incident light and the direction perpendicular to the first surface
  • N 1 is the refractive index of the first prism structure
  • n 2 is the refractive index of the second prism structure
  • ⁇ 1 is the sandwich between the first light-incident surface and the first surface Angle
  • ⁇ 2 is the angle between the second light-incident surface and the first surface
  • ⁇ 2 is the angle between the first light-emitting surface and the second surface
  • ⁇ 3 is the angle between the The included angle between the first light incident surface and the second light incident surface.
  • the exit angle of the light emitted from the second light exit surface satisfies the following formula:
  • ⁇ '12 from the second light emitting surface and light emitted perpendicular to the angle between the direction of the second surface, ⁇ ' 4 is the direction perpendicular to the second incident surface of the first
  • n 1 is the refractive index of the first prism structure
  • n 2 is the refractive index of the second prism structure
  • ⁇ 1 is the distance between the first light incident surface and the first surface
  • ⁇ 2 is the angle between the second light incident surface and the first surface
  • ⁇ 3 is the angle between the first light incident surface and the second light incident surface
  • ⁇ 1 is the angle between the second light-emitting surface and the second surface
  • ⁇ 2 is the angle between the first light-emitting surface and the second surface.
  • the area of the first connection surface is the same as the area of the second connection surface, and the first connection surface of each of the first prism structures and the second connection surface of the corresponding second prism structure are at The orthographic projections on the transparent substrate coincide.
  • the first prism structure, the transparent substrate, and the second prism structure are integrally formed.
  • the present disclosure also provides a backlight device, including a light guide plate and the above light conversion structure, the light guide plate includes a light exit surface, the light conversion structure is located on the light exit side of the light guide plate, the light guide plate further includes The light source on the first side of the light guide plate adjacent to the light exit surface, and the reflection structure on the second side of the light guide plate opposite to the first side;
  • the first incident light is light that propagates through the light guide plate and is directly emitted from the light exit surface of the light guide plate among the light emitted by the light source;
  • the second incident light is the light emitted by the light source after propagating through the light guide plate, exiting from the second side, and reflecting back to the light guide plate by the reflective structure, and then being led out by the light guide plate again.
  • the present disclosure also provides a VR display device including the above-mentioned backlight device.
  • FIG. 1 shows a schematic structural diagram of a backlight device in an embodiment of this embodiment
  • FIG. 2 shows a schematic diagram of the optical paths of the first incident light and the second incident light in an implementation of this embodiment
  • FIG. 3 shows a schematic diagram of the optical path of the first incident light in an implementation of this embodiment
  • Figure 4 shows an enlarged schematic diagram of a part of the structure of Figure 3;
  • FIG. 5 shows a schematic diagram of the optical path of the second incident light in an implementation of this embodiment
  • Fig. 6 shows an enlarged schematic diagram of a part of the structure of Fig. 5;
  • FIG. 7 shows a schematic diagram of an optical path of first incident light exiting after passing through the light conversion structure in an implementation of this embodiment
  • FIG. 8 shows a schematic diagram of the optical path of the second incident light exiting through the light conversion structure in an implementation of this embodiment.
  • the size of the display screen of the VR system is relatively small. With the continuous development of the VR system, the size of the display screen of the VR system continues to decrease, for example, some have been reduced to 2.48 inches.
  • the side-lit backlight used in LCD (Liquid Crystal Display) devices will have more reflected light when the size is reduced, and the reflected light has a longer optical path. In VR display, if the reflected light cannot be used The light direction will lead to a decline in the utilization rate of light energy.
  • the light direction refers to adjusting the exit direction of the light to a required angle for utilization, thereby improving the utilization rate of light energy.
  • this embodiment provides a light conversion structure, which can make the first incident light in the first direction and the second incident light in the second direction have the sum of the first preset angle whose difference is less than the preset value.
  • the second preset angle is emitted, and the light direction can be realized by adjusting the emission angles of the first incident light and the second incident light.
  • a light conversion structure 10 of this embodiment includes:
  • a transparent substrate 101, the transparent substrate 101 includes a first surface and a second surface that are opposed to each other;
  • a plurality of first prism structures 102 are arranged in an array on the first surface, and each of the first prism structures 102 includes a first light incident surface and a second light incident surface that are adjacently or opposite to each other.
  • a plurality of second prism structures 103 are arranged in an array on the second surface, and a plurality of the second prism structures 103 are arranged in a one-to-one correspondence with a plurality of the first prism structures 102, each of the second prism structures
  • the prism structure 103 includes a first light-emitting surface and a second light-emitting surface that are adjacent or opposite to each other;
  • the first incident light 100 enters the first prism structure 102 from the first light-incident surface, passes through the transparent substrate 101, the second prism structure 103, and can pass from the first predetermined angle.
  • the first light-emitting surface emits;
  • the second incident light 200 enters the first prism structure 102 from the second light incident surface, passes through the transparent substrate 101, the second prism structure 103, and can be at the second predetermined angle Emit from the second light-emitting surface;
  • the difference between the first preset angle and the second preset angle is less than a preset value.
  • the first incident light 100 and the second incident light 200 incident on the light conversion structure 10 in different directions can be emitted at a preset angle, so that the emission angle of the incident light can be adjusted by adjusting the emission angle of the incident light. It is matched with the VR optical path, and the exit angles of the first incident light 100 and the second incident light 200 incident on the light conversion structure 10 in different directions are matched with the VR optical path, thereby providing light energy utilization.
  • the VR light path is the propagation path of light in the VR display device when the light conversion structure 10 in the present disclosure is applied to the VR display device.
  • the size of the preset value can be set according to actual needs, as long as the light deflected by the light conversion structure 10 can match the VR optical path.
  • the first predetermined angle ( ⁇ 12 ) is the angle between the light emitted from the first light-emitting surface and the direction perpendicular to the second surface
  • the The second predetermined angle ( ⁇ ' 12 ) is the angle between the light emitted from the second light-emitting surface and the direction perpendicular to the second surface
  • the first predetermined angle and the second predetermined angle It is assumed that the angle is the same, that is, the preset value is zero, that is, the difference between the first preset angle and the second preset angle is zero.
  • the first prism structures 102 in each row or each column are symmetrically arranged with respect to the row center or column center;
  • the second prism structures 103 in each row or column are symmetrically arranged with respect to the row center or column center.
  • the first prism structure 102 and the second prism structure 103 are both arranged on the transparent substrate 101 in a centrally symmetrical manner. After the incident light in different directions is deflected by the light conversion structure 10, both are directed toward the transparent substrate. The direction of the center of the substrate 101 converges to emit light, which effectively improves the utilization rate of light energy and ensures the light directivity.
  • the first prism structure 102 and the second prism structure 103 may have a variety of specific structure forms.
  • the first prism structure 102 includes the first light incident surface and the first light incident surface and The second light incident surface, and a first connection surface disposed on the transparent substrate 101, the first light incident surface and the second light incident surface are both connected to the first connection surface
  • the The second prism structure 103 includes the first light-emitting surface and the second light-emitting surface that are adjacently disposed, and a second connecting surface disposed on the transparent substrate 101, the first light-emitting surface and the second light-emitting surface Both light-emitting surfaces are connected to the second connecting surface;
  • the first incident light 100 is incident into the first prism structure 102 from the first light incident surface, and after being totally reflected inside the second light incident surface, it exits from the first light exit surface ;
  • the second incident light 200 is incident into the first prism structure 102 from the second light incident surface, and after being totally reflected inside the first light incident surface, it exits from the second light exit surface .
  • the cross-sections of the first prism structure 102 and the second prism structure 103 in this embodiment are triangular.
  • light 1 and light 2 emitted from the light source 40 (direction of light 1 and light 2) Same)
  • the first prism structure 102 and the second prism structure 103 After passing through the light guide plate 20, the first prism structure 102 and the second prism structure 103, it exits at two positions at two angles (incident to the first light incident surface of two different first prism structures 102 and from The first light exit surfaces of the two different second prism structures 103 are emitted, and the exit angles of the light 1 and the light 2 are different);
  • the light emitted from the light source 40 reaches the opposite side of the light guide plate 20 (on the light guide plate 20 where the light source 40 is located)
  • the side opposite to the side) is reflected by the reflective structure 30, the reflected light 3 and the reflected light 4 are also emitted at two angles at two positions after passing through the light guide plate 20, the first prism structure 102 and
  • the first prism structure 102 and the second prism structure 103 are respectively centrally symmetrically distributed.
  • the angle between light and other parameters which can make the exit angle of the light 1 and the reflected light 4 emitted at the same position (emitted from the first and second light exit surfaces of the same second prism structure 103) are the same, and exit at the same position
  • the exit angles of the light 2 and the reflected light 3 are the same, and the exit angle matches the VR optical path.
  • the exit angle of the light emitted from the first light exit surface satisfies the following formula:
  • ⁇ 12 is the angle between the light emitted from the first light-emitting surface and the direction perpendicular to the second surface
  • ⁇ 4 is the angle between the first incident light 100 and the direction perpendicular to the first surface
  • N 1 is the refractive index of the first prism structure 102
  • n 2 is the refractive index of the second prism structure 103
  • ⁇ 1 is the difference between the first light incident surface and the first surface
  • ⁇ 2 is the angle between the second light-incident surface and the first surface
  • ⁇ 2 is the angle between the first light-emitting surface and the second surface
  • ⁇ 3 Is the angle between the first light incident surface and the second light incident surface.
  • ⁇ 12 ⁇ 11 - ⁇ 2 (10).
  • formula (3) is obtained from triangle GBH and triangle ABC:
  • the refractive index of the first prism structure 102 and the second prism structure 103 may also be different.
  • n 1 *cos( ⁇ DKJ) n 2 *cos( ⁇ ILC)
  • combined with the formula (e), (f) obtain the formula Then combine the other formulas above to obtain the required derivation formula of ⁇ 12 .
  • ⁇ 11 - ⁇ 12 ⁇ MJn.
  • the propagation process of light passing through the first prism structure 102, the transparent substrate 101, and the second prism structure 103 must meet the following conditions: the light must be totally reflected at the BC side, and the incident angle must be greater than the critical total reflection angle, When refraction occurs on the EF side, the incident angle should be smaller than the critical total reflection angle.
  • the specific conditions that need to be met are as follows:
  • the exit angle of the light emitted from the second light exit surface satisfies the following formula:
  • ⁇ '12 to the second surface from the light emitted perpendicular to the angle between the direction of the second surface, ⁇ ' 4 is the second 200 incident perpendicular to the first surface
  • n is the refractive index of the transparent substrate 101
  • n 1 is the refractive index of the first prism structure 102
  • n 2 is the refractive index of the second prism structure 103
  • ⁇ 1 is The angle between the first light incident surface and the first surface
  • ⁇ 2 is the angle between the second light incident surface and the first surface
  • ⁇ 3 is the first light incident angle between the surface and the second surface
  • ⁇ 1 is between the light emitting surface and the second surface of the second angle
  • ⁇ '12 ⁇ 1 - ⁇ ' 11 (20).
  • the refractive index of the first prism structure 102 and the second prism structure 103 may also be different.
  • the propagation process of light through the first prism structure 102, the transparent substrate 101, and the second prism structure 103 must meet the following conditions: the light must be totally reflected on the AB side, and the incident angle must be greater than the critical total reflection angle, When refraction occurs on the DE side, the incident angle should be less than the critical total reflection angle.
  • the specific conditions that need to be met are as follows:
  • the angles ( ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 1, ⁇ 2, ⁇ 3 ) of the first prism structure 102 and the second prism structure 103 can be set as needed, so that The difference between the first preset angle and the second preset angle is less than the preset value.
  • the area of the first connection surface is the same as the area of the second connection surface
  • the first connection surface of each first prism structure 102 corresponds to the second connection surface of the second prism structure 103
  • the orthographic projection of the connecting surface on the transparent substrate 101 coincides, that is, the orthographic projection of the first connecting surface of each first prism structure 102 on the transparent substrate 101 and the corresponding second prism structure 103
  • the orthographic projections of the second connecting surface on the transparent substrate 101 coincide.
  • a first prism structure is named a first sub-prism structure
  • a second prism structure corresponding to the first sub-prism structure is named a first sub-prism structure.
  • the first prism structure 102 and the second prism structure 103 are arranged in a one-to-one correspondence, so that the incident light incident on one of the first prism structures 102 varies from the one corresponding to the first prism structure 102
  • the second prism structure 103 emits light, which facilitates the adjustment of the light emission angle.
  • the refractive indices of the first prism structure 102 and the second prism structure 103 are the same, but not limited to this.
  • the first prism structure 102 and the second prism structure 103 The same refractive index of the prism structure 103 facilitates the selection of the materials of the first prism structure 102 and the second prism structure 103, simplifies the calculation process of obtaining the first preset angle and the second preset angle, and facilitates adjustment
  • the corresponding angles of the first prism structure 102 and the second prism structure 103 are convenient to obtain the desired exit angle of light.
  • the first prism structure 102, the transparent substrate 101, and the second prism structure 103 are integrally formed, which simplifies the process steps and strengthens the first prism structure 102, the transparent substrate 101, The stability of the second prism structure 103.
  • This embodiment also provides a backlight device, including a light guide plate 20 and the aforementioned light conversion structure 10, the light guide plate 20 includes a light exit surface, the light conversion structure 10 is located on the light exit side of the light guide plate 20, and the light guide plate 20
  • the light plate 20 also includes a light source 40 located on a first side of the light guide plate 20 adjacent to the light exit surface, and a reflective structure 30 located on a second side of the light guide plate 20 opposite to the first side;
  • the first incident light 100 is the light emitted from the light source 40 that propagates through the light guide plate 20 and is directly emitted from the light exit surface of the light guide plate 20;
  • the second incident light 200 is the light emitted by the light source 40 after propagating through the light guide plate 20, exiting from the second side, and being reflected back to the light guide plate 20 by the reflective structure 30, and then being guided again Light derived from the light board 20.
  • the light entrance surface and the light exit surface of the light guide plate 20 are arranged adjacent to each other, the light source 40 is arranged directly opposite to the light entrance surface, and the backlight device is an edge-type backlight device.
  • the backlight device in this embodiment can be applied to a VR display backlight with a smaller screen size and more reflected light.
  • the reflected light can be used to achieve light direction, improve the utilization rate of light energy, and reduce the power consumption of the VR display device.
  • This embodiment also provides a virtual reality display device including the above-mentioned backlight device.
  • the first incident light 100 and the second incident light 200 incident on the light conversion structure 10 in different directions can be emitted at a preset angle, so that the exit angle of the incident light can be adjusted to make the incident light
  • the exit angle of is matched with the VR light path, and the exit angles of the first incident light 100 and the second incident light 200 that are incident on the light conversion structure 10 in different directions are matched with the VR light path, thereby providing light energy utilization.

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  • Optics & Photonics (AREA)
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Abstract

一种光转换结构（10）、背光装置、虚拟现实显示装置，光转换结构（10）包括：透明基材（101），透明基材（101）包括相对设置的第一表面和第二表面；多个第一棱镜结构（102），阵列式排布于第一表面，每个第一棱镜结构（102）包括相邻或相对设置的第一入光面和第二入光面，第一入光面用于接收第一入射光（100），第二入光面用于接收第二入射光（200）；多个第二棱镜结构（103），阵列式排布于第二表面，每个第二棱镜结构（103）包括相邻或相对设置的第一出光面和第二出光面；第一入射光（100）从第一入光面入射、并以第一预设角度从第一出光面出射；第二入射光（200）从第二入光面入射至第一棱镜结构（102）、并以第二预设角度从第二出光面出射；其中，第一预设角度与第二预设角度的差值小于预设值。

Description

光转换结构、背光装置及虚拟现实显示装置
相关申请的交叉引用
本申请主张在2019年6月24日在中国提交的中国专利申请号No.201910548784.4的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示产品制作技术领域，尤其涉及一种光转换结构、背光装置及虚拟现实显示装置。
背景技术
虚拟现实(Virtual Reality，VR)技术，是20世纪发展起来的一项全新的实用技术。虚拟现实技术囊括计算机、电子信息、仿真技术于一体，其基本实现方式是计算机模拟虚拟环境从而给人以环境沉浸感。
发明内容
本公开实施例提供了一种光转换结构，包括：
透明基材，所述透明基材包括相对设置的第一表面和第二表面；
多个第一棱镜结构，阵列式排布于所述第一表面，每个所述第一棱镜结构包括相邻或相对设置的第一入光面和第二入光面，所述第一入光面用于接收从第一方向入射的第一入射光，所述第二入光面用于接收从第二方向入射的第二入射光；
多个第二棱镜结构，阵列式排布于所述第二表面，且多个所述第二棱镜结构与多个所述第一棱镜结构一一对应设置，每个所述第二棱镜结构包括相邻或相对设置的第一出光面和第二出光面；
所述第一入射光从所述第一入光面入射至所述第一棱镜结构、经所述透明基材、与所述第一棱镜结构对应的所述第二棱镜结构、能够以第一预设角度从所述第一出光面出射；
所述第二入射光从所述第二入光面入射至所述第一棱镜结构、经所述透 明基材、与所述第一棱镜结构对应的所述第二棱镜结构、能够以所述第二预设角度从所述第二出光面出射；
其中，所述第一预设角度与所述第二预设角度的差值小于预设值。
可选的，所述第一预设角度为从所述第一出光面出射的光与垂直于所述第二表面的方向之间的夹角，所述第二预设角度为从所述第二出光面出射的光与垂直于所述第二表面的方向之间的夹角，所述第一预设角度与所述第二预设角度相同。
可选的，每一行或每一列的所述第一棱镜结构相对于其行向中心或列向中心对称设置；
每一行或每一列的所述第二棱镜结构相对于其行向中心或列向中心对称设置。
可选的，所述第一棱镜结构包括相邻设置的所述第一入光面和所述第二入光面，以及设置于所述透明基材上的第一连接面，所述第一入光面和所述第二入光面均与所述第一连接面连接，所述第二棱镜结构包括相邻设置的所述第一出光面和所述第二出光面，以及设置于所述透明基材上的第二连接面，所述第一出光面和所述第二出光面均与所述第二连接面连接；
所述第一入射光从所述第一入光面入射至所述第一棱镜结构内，并在所述第二入光面的内侧发生全反射后，从所述第一出光面出射；
所述第二入射光从所述第二入光面入射至所述第一棱镜结构内，并在所述第一入光面的内侧发生全反射后，从所述第二出光面出射。
可选的，所述第一棱镜结构、所述第二棱镜结构的折射率相同。
可选的，从所述第一出光面出射的光的出射角度满足以下公式：
Figure PCTCN2020096661-appb-000001
其中，θ 12为从所述第一出光面出射的光与垂直于所述第二表面的方向之间角度，θ 4为所述第一入射光与垂直于所述第一表面的方向之间的夹角，n 1为所述第一棱镜结构的折射率，n 2为所述第二棱镜结构的折射率，α 1为所述第一入光面与所述第一表面之间的夹角，α 2为所述第二入光面与所述第一表面之间的夹角，β 2为所述第一出光面与所述第二表面之间的夹角，α 3为所述第一入光面和所述第二入光面之间的夹角。
可选的，从所述第二出光面出射的光的出射角度满足以下公式：
Figure PCTCN2020096661-appb-000002
其中，θ' 12为从所述第二出光面出射的光与垂直于所述第二表面的方向之间角度，θ' 4为所述第二入射光与垂直于所述第一表面的方向之间的夹角，n 1为所述第一棱镜结构的折射率，n 2为所述第二棱镜结构的折射率，α 1为所述第一入光面与所述第一表面之间的夹角，α 2为所述第二入光面与所述第一表面之间的夹角，α 3为所述第一入光面和所述第二入光面之间的夹角，β 1为所述第二出光面与所述第二表面之间的夹角，β 2为所述第一出光面与所述第二表面之间的夹角。
可选的，所述第一连接面的面积与所述第二连接面的面积相同，且每一所述第一棱镜结构的第一连接面与对应的第二棱镜结构的第二连接面在所述透明基材上的正投影重合。
可选的，所述第一棱镜结构、所述透明基材、所述第二棱镜结构一体成型。
本公开还提供一种背光装置，包括导光板以及上述的光转换结构，所述导光板包括出光面，所述光转换结构位于所述导光板的出光侧，所述导光板还包括位于所述导光板与所述出光面相邻的第一侧的光源，以及位于所述导光板与所述第一侧相对设置的第二侧的反射结构；
所述第一入射光为所述光源发出的光中经过所述导光板传播并直接从所述导光板的出光面出射的光；
所述第二入射光为所述光源发出的光中经过导光板传播后、从所述第二侧出射、并经所述反射结构反射回所述导光板后、再次被导光板导出的光。
本公开还提供一种VR显示装置，包括上述的背光装置。
附图说明
图1表示本实施例的一实施方式中的背光装置的结构示意图；
图2表示本实施例的一实施方式中的第一入射光和第二入射光的光路示意图；
图3表示本实施例的一实施方式中的第一入射光的光路示意图；
图4表示图3的部分结构放大示意图；
图5表示本实施例的一实施方式中的第二入射光的光路示意图；
图6表示图5的部分结构放大示意图；
图7表示本实施例的一实施方式中第一入射光经所述光转换结构后出射的光路示意图；
图8表示本实施例的一实施方式中第二入射光经所述光转换结构后出射的光路示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开保护的范围。
目前，由于VR(虚拟现实)***的光路特性，有必要发展适用于VR显示的指向型装置，以有效提升光效。且VR***的显示屏幕的尺寸偏小，随着VR***的不断发展，VR***的显示屏幕的尺寸还在继续不断减小，例如有的已经减小到了2.48英寸。另外，LCD(Liquid Crystal Display，液晶显示器)装置使用的侧入式背光，在尺寸减小时会出现更多的反射光，并且反射光的光程较长，在VR显示中如果反射光不能用于光指向将会导致光能利用率的下降。所述光指向是指将光线的出射方向调整为所需要的角度，以进行利用，从而提高光能利用率。
针对上述技术问题，本实施例提供了一种光转换结构，可以使得第一方向的第一入射光和第二方向的第二入射光，以差值小于预设值的第一预设角度和第二预设角度出射，通过调节第一入射光和第二入射光的出射角度可实现光指向。将所述光转换结构应用于屏幕尺寸较小、反射光较多的VR显示背光装置，能够利用反射光实现光指向，提升光能利用率，降低VR显示装置的功耗。
具体的，如图1-图6所示，本实施例的一种光转换结构10，包括：
透明基材101，所述透明基材101包括相对设置的第一表面和第二表面；
多个第一棱镜结构102，阵列式排布于所述第一表面，每个所述第一棱镜结构102包括相邻或相对设置的第一入光面和第二入光面，所述第一入光面用于接收从第一方向入射的第一入射光100，所述第二入光面用于接收从第二方向入射的第二入射光200；
多个第二棱镜结构103，阵列式排布于所述第二表面，且多个所述第二棱镜结构103与多个所述第一棱镜结构102一一对应设置，每个所述第二棱镜结构103包括相邻或相对设置的第一出光面和第二出光面；
所述第一入射光100从所述第一入光面入射至所述第一棱镜结构102、经所述透明基材101、所述第二棱镜结构103、能够以第一预设角度从所述第一出光面出射；
所述第二入射光200从所述第二入光面入射至所述第一棱镜结构102、经所述透明基材101、所述第二棱镜结构103、能够以所述第二预设角度从所述第二出光面出射；
其中，所述第一预设角度与所述第二预设角度的差值小于预设值。
采用上述技术方案，可以使得不同方向入射至所述光转换结构10的第一入射光100和第二入射光200以预设角度出射，从而通过调节入射光的出射角度，使得入射光的出射角度与VR光路相匹配，且使得不同方向入射至所述光转换结构10的第一入射光100和第二入射光200的出射角度均与VR光路匹配，提供光能利用率。其中，所述VR光路为将本公开中的光转换结构10应用于VR显示装置中时，光线在VR显示装置中的传播路径。
所述预设值的大小可根据实际需要设定，只要经所述光转换结构10偏转后的光能够与VR光路相匹配。本实施例的一具体实施方式中，所述第一预设角度(θ 12)为从所述第一出光面出射的光与垂直于所述第二表面的方向之间的夹角，所述第二预设角度(θ' 12)为从所述第二出光面出射的光与垂直于所述第二表面的方向之间的夹角，所述第一预设角度与所述第二预设角度相同，即所述预设值为零，也就是说，所述第一预设角度与所述第二预设角度的差值为零。
本实施例中，每一行或每一列的所述第一棱镜结构102相对于其行向中 心或列向中心对称设置；
每一行或每一列的所述第二棱镜结构103相对于其行向中心或列向中心对称设置。
第一棱镜结构102和第二棱镜结构103均是以中心对称的方式、排布于所述透明基材101上，不同方向的入射光经所述光转换结构10偏转后，均向所述透明基材101的中心的方向收敛的方向出射，有效的提高光能利用率，保证光指向性。
所述第一棱镜结构102和所述第二棱镜结构103的具体结构形式可以有多种，本实施例中，所述第一棱镜结构102包括相邻设置的所述第一入光面和所述第二入光面，以及设置于所述透明基材101上的第一连接面，所述第一入光面和所述第二入光面均与所述第一连接面连接，所述第二棱镜结构103包括相邻设置的所述第一出光面和所述第二出光面，以及设置于所述透明基材101上的第二连接面，所述第一出光面和所述第二出光面均与所述第二连接面连接；
所述第一入射光100从所述第一入光面入射至所述第一棱镜结构102内，并在所述第二入光面的内侧发生全反射后，从所述第一出光面出射；
所述第二入射光200从所述第二入光面入射至所述第一棱镜结构102内，并在所述第一入光面的内侧发生全反射后，从所述第二出光面出射。
参考图1-图6，本实施例中的第一棱镜结构102和第二棱镜结构103的截面为三角形，图1中，从光源40发出的光线1和光线2(光线1和光线2的方向相同)经导光板20、第一棱镜结构102和第二棱镜结构103后在两个位置分别以两个角度出射(入射至两个不同的第一棱镜结构102的第一入光面、并且从两个不同的第二棱镜结构103的第一出光面出射，光线1和光线2的出射角度不同)；从光源40发出的光线到达导光板20的对侧(导光板20上与光源40所在一侧相对设置的一侧)后经反射结构30反射，反射光线3和反射光线4经导光板20、第一棱镜结构102和第二棱镜结构103后同样在两个位置分别以两个角度出射(入射至两个不同的第一棱镜结构102的第二入光面、并且从两个不同的第二棱镜结构103的第二出光面出射，反射光线3和反射光线4的出射角度不同)。第一棱镜结构102和第二棱镜结构103分 别为中心对称式分布，通过调整第一棱镜结构102和第二棱镜结构103的参数(包括相邻的第一入光面和第二入光面之间的角度等参数)，可使在同一位置出射(从同一个第二棱镜结构103的第一出光面和第二出光面出射)的光线1和反射光线4的出射角度相同，在同一位置出射(从同一个第二棱镜结构103的第一出光面和第二出光面出射)的光线2和反射光线3的出射角度相同，且使出射角度与VR光路匹配。
本实施例中，从所述第一出光面出射的光的出射角度满足以下公式：
Figure PCTCN2020096661-appb-000003
其中，θ 12为从所述第一出光面出射的光与垂直于所述第二表面的方向之间角度，θ 4为所述第一入射光100与垂直于所述第一表面的方向之间的夹角，n 1为所述第一棱镜结构102的折射率，n 2为所述第二棱镜结构103的折射率，α 1为所述第一入光面与所述第一表面之间的夹角，α 2为所述第二入光面与所述第一表面之间的夹角，β 2为所述第一出光面与所述第二表面之间的夹角，α 3为所述第一入光面和所述第二入光面之间的夹角。
参考图2、图3和图4，由折射定律、全反射定律和几何角度关系可得到如下关系式：
Figure PCTCN2020096661-appb-000004
Figure PCTCN2020096661-appb-000005
α 1+α 2+α 3＝π   (4)；
θ 7+θ 8＝α 3   (5)；
Figure PCTCN2020096661-appb-000006
sinθ 6＝n 1*sinθ 7    (7)；
θ 8＝θ 9       (8)；
n 2*sinθ 10＝sinθ 11   (9)
θ 12＝θ 11-β 2   (10)。
其中，公式(3)由三角形GBH以及三角形ABC中获得：
∠G+∠B+∠H＝π；
∠GBH＝α 1。
公式(5)由以下公式获得：
Figure PCTCN2020096661-appb-000007
Figure PCTCN2020096661-appb-000008
∠BHI+∠BIH+α 3＝π。
公式(6)由以下公式获得：
β 2+∠FKJ+∠KJF＝π；(a)
Figure PCTCN2020096661-appb-000009
由公式(a)和(b)获得：
Figure PCTCN2020096661-appb-000010
Figure PCTCN2020096661-appb-000011
α 2+∠LIC+∠ILC＝π；(d)
由公式(c)和(d)获得，
Figure PCTCN2020096661-appb-000012
本实施例一具体实施方式中，所述第一棱镜结构102和所述第二棱镜结构103的折射率相同，即入射至所述基材的光线与从所述透明基材101出射的光线平行，所以∠DKJ＝∠ILC，(g)，由公式(e)、(f)、(g)获得上述公式(6)。
需要说明的是，所述第一棱镜结构102和所述第二棱镜结构103的折射率也可以不同，此时，n 1*cos(∠DKJ)＝n 2*cos(∠ILC)，结合公式(e)、(f)可获得公式
Figure PCTCN2020096661-appb-000013
然后结合上述的其他公式即可获得需要的θ 12的推导公式。
公式(10)由以下公式获得：
Figure PCTCN2020096661-appb-000014
Figure PCTCN2020096661-appb-000015
θ 11-θ 12＝∠MJn。
光线经所述第一棱镜结构102、所述透明基材101、所述第二棱镜结构103的传播过程必须满足以下条件：光线要在BC边发生全反射，入射角要大于临界全反射角，在EF边发生折射，入射角要小于临界全反射角，具体需要满 足的条件如下：
Figure PCTCN2020096661-appb-000016
Figure PCTCN2020096661-appb-000017
本实施例中，从所述第二出光面出射的光的出射角度满足以下公式：
Figure PCTCN2020096661-appb-000018
其中，θ' 12为从所述第二出光面出射的光与垂直于所述第二表面的方向之间角度，θ' 4为所述第二入射光200与垂直于所述第一表面的方向之间的夹角，n为所述透明基材101的折射率，n 1为所述第一棱镜结构102的折射率，n 2为所述第二棱镜结构103的折射率，α 1为所述第一入光面与所述第一表面之间的夹角，α 2为所述第二入光面与所述第一表面之间的夹角，α 3为所述第一入光面和所述第二入光面之间的夹角，β 1为所述第二出光面与所述第二表面之间的夹角，β 2为所述第一出光面与所述第二表面之间的夹角。
参考图2、图5和图6，由折射定律、全反射定律和几何角度关系可得到如下关系式：
Figure PCTCN2020096661-appb-000019
Figure PCTCN2020096661-appb-000020
α 1+α 2+α 3＝π  (14)；
θ' 7+θ' 8＝α 3  (15)；
Figure PCTCN2020096661-appb-000021
sinθ′ 6＝n 1*sinθ′ 7   (17)；
θ' 8＝θ' 9     (18)；
n 2*sinθ′ 10＝sinθ′ 11    (19)
θ' 12＝β 1-θ' 11   (20)。
其中，其中，公式(13)由三角形GBH以及三角形ABC中获得：
∠G+∠B+∠H'＝π；
∠GBH'＝α 1。
公式(15)由以下公式获得：
Figure PCTCN2020096661-appb-000022
Figure PCTCN2020096661-appb-000023
∠BH'I'+∠BI'H'+α 3＝π。
公式(16)由以下公式获得：
β 1+∠DK'J'+∠K'J'D＝π；(a')
Figure PCTCN2020096661-appb-000024
由公式(a')和(b')获得：
Figure PCTCN2020096661-appb-000025
Figure PCTCN2020096661-appb-000026
α 1+∠L'I'A+∠I'L'A＝π；(d')
由公式(c')和(d')获得，
Figure PCTCN2020096661-appb-000027
本实施例一具体实施方式中，所述第一棱镜结构102和所述第二棱镜结构103的折射率相同，即入射至所述基材的光线与从所述透明基材101出射的光线平行所以∠FK'J'＝∠I'L'A，(g')，由公式(e')、(f')、(g')获得上述公式(16)。
需要说明的是，所述第一棱镜结构102和所述第二棱镜结构103的折射率也可以不同，此时，n 1*cos(∠FK'J')＝n 2*cos(∠I'L'A)，结合公式(e)、(f)可获得公式
Figure PCTCN2020096661-appb-000028
然后结合上述的其他公式即可获得需要的θ' 12的推导公式。
公式(20)由以下公式获得：
Figure PCTCN2020096661-appb-000029
Figure PCTCN2020096661-appb-000030
θ' 11+θ' 12＝∠M'J'N'。
光线经所述第一棱镜结构102、所述透明基材101、所述第二棱镜结构103的传播过程必须满足以下条件：光线要在AB边发生全反射，入射角要大于临界全反射角，在DE边发生折射，入射角要小于临界全反射角，具体需要满足的条件如下：
Figure PCTCN2020096661-appb-000031
Figure PCTCN2020096661-appb-000032
根据上述公式(1)和公式(11)，根据需要设置第一棱镜结构102和第二棱镜结构103的角度(α 1、α 2、α 3、β 1、β 2、β 3)，可使得所述第一预设角度与所述第二预设角度的差值小于预设值，本实施例的一具体实施方式中，若第一入射光100和第二入射光200满足θ 4＝θ' 4，则通过选择合适的第一棱镜结构102和第二棱镜结构103的角度(α 1、α 2、α 3、β 1、β 2、β 3)可使θ 12＝θ' 12，这样便更好的实现了对于双向入射光均可实现光指向的效果。
本实施例的一具体实施方式中，假定VR光路的目标角度θ 12＝10°，取一种简单的情况进行说明，令α 1＝α 2＝50°，θ 4＝75°，n＝1.5，n 1＝1.6，n 2＝1.6，此时，根据公式(1)和公式(11)，通过数值求解可分别得到：β 1＝21.6°，β 2＝45.3°。将相应的角度参数建立Lighttools模型(光学建模)，Lighttools模拟的相应光路如图7和图8所示，可以看到对于本实施例的光转换结构10，第一入射光100和第二入射光200经光转换结构10后具有一致的出射角度，均为10°。
本实施例中，所述第一连接面的面积与所述第二连接面的面积相同，且每一所述第一棱镜结构102的第一连接面与对应的第二棱镜结构103的第二连接面在所述透明基材101上的正投影重合，即每一所述第一棱镜结构102的第一连接面在所述透明基材101上的正投影与对应的第二棱镜结构103的第二连接面在所述透明基材101上的正投影重合，例如，将一个第一棱镜结构命名为第一子棱镜结构，将与第一子棱镜结构对应的一个第二棱镜结构命名为第二子棱镜结构，那么，第一子棱镜结构的第一连接面在所述透明基材101上的正投影于第二子棱镜结构在所述透明基材101上的正投影重合。
采用上述技术方案，所述第一棱镜结构102和所述第二棱镜结构103一一对应设置，使得入射至一个所述第一棱镜结构102的入射光，从与该第一棱镜结构102对应的第二棱镜结构103中出射，利于光出射角度的调节。
本实施例的一具体实施方式中，所述第一棱镜结构102、所述第二棱镜结构103的折射率相同，但并不以此为限，所述第一棱镜结构102、所述第二棱镜结构103的折射率相同便于选择所述第一棱镜结构102、所述第二棱镜结 构103的材质，简化获得所述第一预设角度和所述第二预设角度的计算过程，便于调整所述第一棱镜结构102和所述第二棱镜结构103的相应的角度，便于获得所需的光的出射角度。
本实施例中，所述第一棱镜结构102、所述透明基材101、所述第二棱镜结构103一体成型，简化工艺步骤，增强所述第一棱镜结构102、所述透明基材101、所述第二棱镜结构103的稳定性。
本实施例还提供一种背光装置，包括导光板20以及上述的光转换结构10，所述导光板20包括出光面，所述光转换结构10位于所述导光板20的出光侧，所述导光板20还包括位于所述导光板20与所述出光面相邻的第一侧的光源40，以及位于所述导光板20与所述第一侧相对设置的第二侧的反射结构30；
所述第一入射光100为所述光源40发出的光中经过所述导光板20传播并直接从所述导光板20的出光面出射的光；
所述第二入射光200为所述光源40发出的光中经过导光板20传播后、从所述第二侧出射、并经所述反射结构30反射回所述导光板20后、再次被导光板20导出的光。
本实施例中，所述导光板20的入光面与出光面相邻设置，所述光源40正对所述入光面设置，该背光装置为侧入式背光装置。
本实施例中的背光装置可应用于屏幕尺寸较小、反射光较多的VR显示背光，能够利用反射光实现光指向，提升光能利用率，降低VR显示装置的功耗。
本实施例还提供一种虚拟现实显示装置，包括上述的背光装置。
通过光转换结构10的设置，可以使得不同方向入射至所述光转换结构10的第一入射光100和第二入射光200以预设角度出射，从而通过调节入射光的出射角度，使得入射光的出射角度与VR光路相匹配，且使得不同方向入射至所述光转换结构10的第一入射光100和第二入射光200的出射角度均与VR光路匹配，提供光能利用率。
以上所述为本公开较佳实施例，需要说明的是，对于本领域普通技术人员来说，在不脱离本公开所述原理的前提下，还可以做出若干改进和润饰， 这些改进和润饰也应视为本公开保护范围。

Claims (11)

  1. 一种光转换结构，包括：
    透明基材，所述透明基材包括相对设置的第一表面和第二表面；
    多个第一棱镜结构，阵列式排布于所述第一表面，每个所述第一棱镜结构包括相邻或相对设置的第一入光面和第二入光面，所述第一入光面用于接收从第一方向入射的第一入射光，所述第二入光面用于接收从第二方向入射的第二入射光；
    多个第二棱镜结构，阵列式排布于所述第二表面，且多个所述第二棱镜结构与多个所述第一棱镜结构一一对应设置，每个所述第二棱镜结构包括相邻或相对设置的第一出光面和第二出光面；
    所述第一入射光从所述第一入光面入射至所述第一棱镜结构、经所述透明基材、与所述第一棱镜结构对应的所述第二棱镜结构、能够以第一预设角度从所述第一出光面出射；
    所述第二入射光从所述第二入光面入射至所述第一棱镜结构、经所述透明基材、与所述第一棱镜结构对应的所述第二棱镜结构、能够以第二预设角度从所述第二出光面出射；
    其中，所述第一预设角度与所述第二预设角度的差值小于预设值。
  2. 根据权利要求1所述的光转换结构，其中，所述第一预设角度为从所述第一出光面出射的光与垂直于所述第二表面的方向之间的夹角，所述第二预设角度为从所述第二出光面出射的光与垂直于所述第二表面的方向之间的夹角，所述第一预设角度与所述第二预设角度相同。
  3. 根据权利要求1所述的光转换结构，其中，每一行或每一列的所述第一棱镜结构相对于其行向中心或列向中心对称设置；
    每一行或每一列的所述第二棱镜结构相对于其行向中心或列向中心对称设置。
  4. 根据权利要求1所述的光转换结构，其中，所述第一棱镜结构包括相邻设置的所述第一入光面和所述第二入光面，以及设置于所述透明基材上的第一连接面，所述第一入光面和所述第二入光面均与所述第一连接面连接， 所述第二棱镜结构包括相邻设置的所述第一出光面和所述第二出光面，以及设置于所述透明基材上的第二连接面，所述第一出光面和所述第二出光面均与所述第二连接面连接；
    所述第一入射光从所述第一入光面入射至所述第一棱镜结构内，并在所述第二入光面的内侧发生全反射后，从所述第一出光面出射；
    所述第二入射光从所述第二入光面入射至所述第一棱镜结构内，并在所述第一入光面的内侧发生全反射后，从所述第二出光面出射。
  5. 根据权利要求4所述的光转换结构，其中，所述第一棱镜结构、所述第二棱镜结构的折射率相同。
  6. 根据权利要求5所述的光转换结构，其中，从所述第一出光面出射的光的出射角度满足以下公式：
    Figure PCTCN2020096661-appb-100001
    其中，θ 12为从所述第一出光面出射的光与垂直于所述第二表面的方向之间角度，θ 4为所述第一入射光与垂直于所述第一表面的方向之间的夹角，n 1为所述第一棱镜结构的折射率，n 2为所述第二棱镜结构的折射率，α 1为所述第一入光面与所述第一表面之间的夹角，α 2为所述第二入光面与所述第一表面之间的夹角，β 2为所述第一出光面与所述第二表面之间的夹角，α 3为所述第一入光面和所述第二入光面之间的夹角。
  7. 根据权利要求5所述的光转换结构，其中，从所述第二出光面出射的光的出射角度满足以下公式：
    Figure PCTCN2020096661-appb-100002
    其中，θ' 12为从所述第二出光面出射的光与垂直于所述第二表面的方向之间角度，θ' 4为所述第二入射光与垂直于所述第一表面的方向之间的夹角，n 1为所述第一棱镜结构的折射率，n 2为所述第二棱镜结构的折射率，α 1为所述第一入光面与所述第一表面之间的夹角，α 2为所述第二入光面与所述第一表面之间的夹角，α 3为所述第一入光面和所述第二入光面之间的夹角，β 1为所述第二出光面与所述第二表面之间的夹角，β 2为所述第一出光面与所述第二表面之间的夹角。
  8. 根据权利要求4所述的光转换结构，其中，所述第一连接面的面积与 所述第二连接面的面积相同，每一所述第一棱镜结构的第一连接面与对应的第二棱镜结构的第二连接面在所述透明基材上的正投影重合。
  9. 根据权利要求1所述的光转换结构，其中，所述第一棱镜结构、所述透明基材、所述第二棱镜结构一体成型。
  10. 一种背光装置，包括导光板以及权利要求1-9任一项所述的光转换结构，所述导光板包括出光面，所述光转换结构位于所述导光板的出光侧，所述导光板还包括位于所述导光板与所述出光面相邻的第一侧的光源，以及位于所述导光板与所述第一侧相对设置的第二侧的反射结构；
    所述第一入射光为所述光源发出的光中经过所述导光板传播并直接从所述导光板的出光面出射的光；
    所述第二入射光为所述光源发出的光中经过导光板传播后、从所述第二侧出射、并经所述反射结构反射回所述导光板后、再次被导光板导出的光。
  11. 一种虚拟现实显示装置，包括权利要求10所述的背光装置。
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