WO2020248329A1 - Dispositif d'affichage de réalité virtuelle - Google Patents

Dispositif d'affichage de réalité virtuelle Download PDF

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Publication number
WO2020248329A1
WO2020248329A1 PCT/CN2019/096800 CN2019096800W WO2020248329A1 WO 2020248329 A1 WO2020248329 A1 WO 2020248329A1 CN 2019096800 W CN2019096800 W CN 2019096800W WO 2020248329 A1 WO2020248329 A1 WO 2020248329A1
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WO
WIPO (PCT)
Prior art keywords
lens
light
wave plate
polarization direction
polarized light
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Application number
PCT/CN2019/096800
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English (en)
Chinese (zh)
Inventor
邱孙杰
牛磊
Original Assignee
上海视涯信息科技有限公司
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Publication of WO2020248329A1 publication Critical patent/WO2020248329A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another

Definitions

  • the embodiment of the present invention relates to virtual reality technology, in particular to a virtual reality display device.
  • Virtual reality (virtual reality, VR) technology is a computer simulation system that can create and experience virtual worlds. It has been widely used in games, entertainment, education, medical care, and military simulation.
  • Existing short-distance virtual reality modules use semi-transparent and semi-reflective films to realize the reentry of the optical path.
  • the semi-transparent and semi-reflective films also introduce non-imaging light such as radiated stray light inside the optical system. It is stray light, which forms ghost images, which degrades image quality, such as lower contrast and signal-to-noise ratio. Even if the wave plate attached to the screen surface is coated with anti-reflection coating, it can only reduce ghost images and stray light, but cannot completely eliminate it. , Resulting in unclear imaging and easily cause dizziness and other problems for users.
  • the present invention provides a virtual reality display device, including a display panel and an optical system, the optical system is disposed between the display panel and the user viewing side; the optical system includes a lens group, the lens group It includes a first lens, a second lens and a transflective film arranged between the first lens and the second lens; a first 1/4 is arranged in sequence between the display panel and the lens group Wave plate, first transmission type polarizer, second quarter wave plate.
  • the first transmissive polarizer passes light in a first polarization direction and absorbs light in a second polarization direction, and the first polarization direction and the second polarization direction are orthogonal.
  • the light in the first polarization direction is P-polarized light
  • the light in the second polarization direction is S-polarized light
  • the light in the first polarization direction is S-polarized light
  • the light in the second polarization direction is P-type polarized light.
  • the first lens is a plano-convex lens
  • the second lens is a plano-concave lens
  • the first lens is arranged close to the side of the user observation side
  • the second lens is arranged close to the side of the display screen
  • the semi-transmissive and semi-reflective coating is formed on the convex surface of the first lens on the side close to the second lens.
  • the second lens, the second quarter wave plate, the first transmissive polarizer, and the first quarter wave plate are closely attached to each other in sequence.
  • the difference between the refractive index of the second quarter wave plate and the refractive index of the second lens is less than or equal to 0.2.
  • an anti-reflection coating is provided between the second quarter wave plate and the second lens.
  • the light in the first polarization direction passes through the first transmissive polarizer, and the light in the first polarization direction
  • the circularly polarized light passes through the second quarter wave plate and is converted into circularly polarized light.
  • the circularly polarized light passes through the second lens and is partially reflected by the transflective film.
  • the reflected circularly polarized light passes through the The second quarter wave plate is converted into light in a second polarization direction, and the light in the second polarization direction is absorbed by the first transmission-type polarizing plate.
  • a third quarter-wave plate, a reflective polarizer, a second transmissive polarizer, and a fourth quarter-wave plate are sequentially arranged between the lens group and the user viewing side.
  • the second transmissive polarizer and the first transmissive polarizer are the same type of transmissive polarizer.
  • the transmission axes of the first transmission type polarizer, the second transmission type polarizer and the reflection type polarizer are parallel to each other.
  • the first lens, the third quarter wave plate, the reflective polarizer, the second transmissive polarizer, and the fourth quarter wave plate are closely attached to each other.
  • the difference between the refractive index of the third quarter wave plate and the refractive index of the first lens is less than or equal to 0.2.
  • an anti-reflection coating is provided between the third quarter wave plate and the first lens.
  • the light in the first polarization direction passes through the first transmissive polarizer, and the light in the first polarization direction It is converted into circularly polarized light after passing through the second quarter wave plate, and the circularly polarized light passes through the second lens and partially transmits through the semi-transparent and semi-reflective film;
  • the polarized light passes through the first lens and the third quarter wave plate to be converted into light in the second polarization direction, the light in the second polarization direction is reflected by the reflective polarizer, and the reflected first
  • the light in the two polarization directions is converted into circularly polarized light through the third quarter wave plate.
  • the circularly polarized light passes through the first lens and partially transmits through the transflective film, and is partially transmitted by the transflective film.
  • the semi-reflective film reflects; the circularly polarized light passing through the semi-transmissive semi-reflective film passes through the second lens and is converted into light in the first polarization direction through the second quarter wave plate, the first polarization direction
  • the light transmitted through the first transmissive polarizer, the light in the first polarization direction transmitted through the first transmissive polarizer is converted into circularly polarized light through the first quarter wave plate, and the circle Polarized light is reflected by the display panel, and the circularly polarized light reflected by the display panel is converted into light in the second polarization direction through the first quarter wave plate, and the light in the second polarization direction is
  • the first transmissive polarizer absorbs.
  • the circularly polarized light reflected by the transflective film passes through the first lens and passes through the third quarter wave plate to be converted into light in the first polarization direction.
  • the light in the polarization direction passes through the reflective polarizer and the second transmissive polarizer and then passes through the fourth quarter-wave plate 26 to be converted into circularly polarized light, and the circularly polarized light reaches the user to observe side.
  • a second lens group is further provided between the display panel and the first quarter wave plate, and the second lens group includes one or more optical lenses.
  • a third lens group is further provided between the user viewing side and the fourth quarter wave plate, and the third lens group includes one or more optical lenses.
  • the display panel is a liquid crystal display panel or an organic light emitting display device.
  • the display panel is a silicon-based micro display panel.
  • the present invention also provides a virtual reality display device, including a display panel and an optical system, the optical system is arranged between the display panel and the user viewing side; the optical system includes a lens group, the lens group includes a first A lens, a second lens, and a transflective film arranged between the first lens and the second lens; a first quarter wave plate, The first transmission type polarizer, the second quarter wave plate; the third quarter wave plate, the reflection type polarizer, the second transmission type polarizer, The fourth quarter wave plate.
  • the light in the first polarization direction passes through the first transmissive polarizer, and the light in the first polarization direction
  • the circularly polarized light passes through the second quarter-wave plate and is converted into circularly polarized light.
  • the circularly polarized light passes through the second lens and is partially reflected by the transflective film and partially transmitted through the transflective film;
  • the reflected circularly polarized light passes through the second quarter wave plate and is converted into light in a second polarization direction, and the light in the second polarization direction is absorbed by the first transmissive polarizer;
  • the circularly polarized light of the transflective film passes through the first lens and the third quarter-wave plate and is converted into light in a second polarization direction, and the light in the second polarization direction is polarized by the reflection type.
  • the reflected light in the second polarization direction is converted into circularly polarized light through the third quarter wave plate, and the circularly polarized light passes through the first lens and partially transmits through the semi-transparent light.
  • the reflective film is partially reflected by the transflective film; the circularly polarized light passing through the transflective film passes through the second lens and is converted into the first polarization direction through the second quarter wave plate.
  • the light in the first polarization direction passes through the first transmission type polarizer, and the light in the first polarization direction passes through the first transmission type polarizer passes through the first quarter wave plate Converted into circularly polarized light, the circularly polarized light is reflected by the display panel, and the circularly polarized light reflected by the display panel is converted into light in a second polarization direction through the first quarter wave plate, the The light in the second polarization direction is absorbed by the first transmissive polarizer.
  • the circularly polarized light reflected by the transflective film passes through the first lens and passes through the third quarter wave plate to be converted into light in the first polarization direction.
  • the light in the polarization direction passes through the reflective polarizer and the second transmissive polarizer and then passes through the fourth quarter-wave plate 26 to be converted into circularly polarized light, and the circularly polarized light reaches the user to observe side
  • the stray light reflected from the transflective film back to the display panel for the first time and the stray light transmitted through the transflective film and propagating toward the display panel for the second time are finally transformed into the first
  • the light in the second polarization direction is absorbed by the first transmission polarizer and will not enter the subsequent optical system. Therefore, the light finally observed by the human eye on the user side eliminates stray light, eliminates ghost display, and improves The display effect of virtual reality display is improved.
  • FIG. 1 is a schematic diagram of a virtual reality display device provided by Embodiment 1 of the present invention.
  • FIG. 2 is a diagram of the light path from the display panel to the first linear polarizer in the first embodiment
  • FIG. 3 is a schematic diagram of the virtual reality display device provided in the second embodiment
  • Figure 4 is a light path diagram in the second embodiment
  • Fig. 5 is a schematic diagram of an implementation in the third embodiment
  • Fig. 6 is a schematic diagram of another implementation in the third embodiment.
  • FIG. 7 is a schematic diagram of yet another implementation manner in the third embodiment.
  • the virtual reality display device includes: a display panel 10 and an optical system, the optical system is arranged between the display panel 10 and the user viewing side 11, The display panel 10 is used to generate images.
  • the optical system is used for zooming the near image generated by the display panel 10 to a far distance, almost filling the field of view of the person, thereby generating a sense of immersion.
  • the optical system is a polarization reflex optical system, and a transflective film needs to be provided to reflect and amplify the natural light generated by the display panel, and then perform subsequent processing to reach the user observation side 11.
  • the optical system includes a lens group 12 arranged between the display panel 10 and the user viewing side 11.
  • the lens group 12 includes a first lens 121, a second lens 122, and a translucent lens arranged between the first lens 121 and the second lens 122.
  • Semi-reflective film 123 A first quarter-wave plate 13, a first transmissive polarizing plate 14 and a second quarter-wave plate 15 are further arranged between the display panel 10 and the lens group 12 in sequence.
  • FIG. 2 is a diagram of the light path from the display panel 10 to the lens group 12.
  • the natural light L1 emitted from the display panel 10 passes through the first quarter-wave plate 13, the first transmissive polarizer 14 and the second quarter-wave plate 15 in sequence.
  • the function of the first transmission type polarizer 14 is to transmit light in the first polarization direction and absorb light in the second polarization direction.
  • the first polarization direction and the second polarization direction are orthogonal to each other.
  • the first transmission type The polarizer 14 transmits P-type polarized light and absorbs S-type polarized light.
  • the functions of the first quarter-wave plate 13 and the second quarter-wave plate 15 are to change the polarization direction of the light passing through the quarter-wave plate twice.
  • the nature of the light L1 does not change after passing through the first quarter-wave plate 13 and remains the light L1.
  • the light L1 then propagates to the first linear polarizer 14, the P-type polarized light L2 in the light L1 passes through the first linear polarizer 14, and the polarized light in other directions including S-type polarized light is absorbed by the first linear polarizer 14.
  • the P-type polarized light L2 then passes through the second quarter-wave plate 15 and is converted into circularly polarized light L3, and then propagates in the direction of the lens group 12.
  • the circularly polarized light L3 passes through the second lens 122 of the lens group 12
  • a part of the circularly polarized light L31 passes through the transflective film 123 and enters the subsequent lens system, and the other part of the circularly polarized light L32 is reflected by the transflective film 123.
  • the reflected circularly polarized light L32 passes through the second quarter wave plate 15 for the second time.
  • the circularly polarized light L32 is transformed into S-type polarized light L4.
  • the S-type polarized light L4 propagates to the first transmission polarizer 14 and is
  • the first transmissive polarizer 14 absorbs and cannot pass through the first transmissive polarizer 14.
  • the first quarter-wave plate 13, the first transmissive polarizer 14, and the second quarter-wave plate 15 are not provided, part of the light reflected by the transflective film 123 may enter the subsequent optical system, such as the display panel 10 After reflection, it enters the subsequent optical system, causing ghost images and reducing the display effect of the virtual reality display device.
  • the first quarter wave plate 13, the first transmissive polarizer 14, and the second quarter wave plate 15 are provided to convert the light reflected by the transflective film 123 into S-type polarized light. It is absorbed by the first transmissive polarizer 14 to prevent it from entering the subsequent optical system, eliminating ghost display, and improving the display effect of the virtual reality display device.
  • the first transmissive polarizer 14 may be a polarizer that transmits S-type polarized light and absorbs P-type polarized light, and the S-type polarized light passing through the first transmissive polarizer 14 passes through the second The quarter-wave plate 15 is partially reflected by the transflective film 123, and then converted into P-type polarized light by the second quarter-wave plate 15. The P-type polarized light is absorbed by the first transmissive polarizer 14 and cannot After entering the optical system, the ghost display is eliminated and the display effect of the virtual reality display device is improved.
  • the first lens 121 is a plano-convex lens
  • the second lens 122 is a plano-concave lens
  • the first lens 121 is close to the user's observation side 11
  • the second lens 122 is close to Display the side of the screen 10.
  • the transflective film 123 between the first lens 121 and the second lens 122 is coated and formed on the convex surface of the first lens 121 close to the second lens 122.
  • the first lens and the second lens may also be other types of lenses, for example, the first lens is a double convex lens, or the second lens is a double convex lens.
  • the lens of the virtual reality display device may also include more than two lenses.
  • the second lens 122, the second quarter wave plate 15, the first transmissive polarizer 14, and the first quarter wave plate 13 are in close contact with each other in sequence. Together. If the second lens is a plano-concave lens, the second quarter-wave plate 15, the first transmissive polarizer 14, and the first quarter-wave plate 13 are attached to the plane side of the plano-concave lens in sequence. If the second lens is a double The convex lens, the second quarter-wave plate 15, the first transmissive polarizer 14, and the first quarter-wave plate 13 are sequentially attached to the curved surface of the lenticular lens and are also in a curved state.
  • the above-mentioned optical films are tightly attached to avoid an air layer between the films. If there is an air layer between the films, the refractive index of the air layer and the refractive index of the film are different, light refraction or reflection will occur. Reduce the optical effect.
  • the above-mentioned disadvantages can be avoided by closely adhering the diaphragms to remove the air layer.
  • the refractive index of the second quarter-wave plate and the second lens are the same, or an anti-reflection film is provided between the second quarter-wave plate and the second lens.
  • the refractive index of the second quarter wave plate 15 and the second lens 122 are set to be the same or very close, for example, both The refractive index difference is within 0.2, or an anti-reflection coating is provided to avoid reflection and refraction of light at the interface between the two, and improve the optical effect.
  • FIG. 3 is a schematic diagram of the virtual reality display device provided in the second embodiment
  • FIG. 4 is a light path diagram of the virtual reality display device shown in FIG. 3.
  • the virtual reality display device provided in the second embodiment includes a display panel 20 and an optical system.
  • the optical system is arranged between the display panel 20 and the user viewing side 21.
  • the display panel 20 is used to generate images, and the optical system is used to generate images from the display panel 20.
  • the near image is zoomed in to the far, almost full of people's field of view, thus creating a sense of immersion.
  • the optical system is a polarization reflex optical system, and a transflective film needs to be provided to reflect and amplify the natural light generated by the display panel 20, and then perform subsequent processing to reach the user observation side 21.
  • the optical system includes a lens group 22 that includes a first lens 221, a second lens 222, and a transflective film 223 disposed between the first lens 221 and the second lens 222.
  • a first quarter-wave plate 23, a first transmissive polarizing plate 24, and a second quarter-wave plate 25 are sequentially arranged between the display panel 20 and the lens group 22, and between the lens group 22 and the user viewing side 21
  • a third quarter-wave plate 26, a reflective polarizer 27, a second transmission-type polarizer 28, and a fourth quarter-wave plate 29 are provided in this order.
  • the functions of the first transmissive polarizer 24 and the second transmissive polarizer 28 are to transmit light in the first polarization direction and absorb light in the second polarization direction, and the first polarization direction and the second polarization direction are orthogonal.
  • the functions of the first quarter-wave plate 23, the second quarter-wave plate 25, the third quarter-wave plate 26, and the fourth quarter-wave plate 29 are to make the light that passes through the quarter-wave plate twice.
  • the polarization direction changes.
  • the function of the reflective polarizer 27 is to reflect light in the second polarization direction and transmit light in the first polarization direction.
  • the nature of the light L1 does not change after passing through the first quarter-wave plate 23 and remains the light L1.
  • the light L1 then propagates toward the first linear polarizer 24, the P-type polarized light L2 in the light L1 passes through the first linear polarizer 24, and the polarized light in other directions including S-type polarized light is absorbed by the first linear polarizer 24.
  • the P-type polarized light L2 then passes through the second quarter-wave plate 25 and is converted into circularly polarized light L3, and then propagates toward the lens group 22.
  • the circularly polarized light L3 passes through the second lens 222 of the lens group 22, a part of the circularly polarized light L31 passes through the transflective film 223 and enters the subsequent lens system, and the other part of the circularly polarized light L32 is reflected by the transflective film 223.
  • the reflected circularly polarized light L32 passes through the second quarter-wave plate 25 for the second time, the circularly polarized light L32 is converted into S-type polarized light L4, and the S-type polarized light L4 propagates to the first transmissive polarizer 24 and is
  • the first transmissive polarizer 24 absorbs and cannot pass through the first transmissive polarizer 24. Therefore, the part of the stray light reflected by the semi-transparent and semi-reflective film 223 will not produce ghost images, which improves the display effect of the virtual reality display device.
  • the optical path of the circularly polarized light L31 entering the subsequent lens system through the transflective film 223 is as follows: the circularly polarized light L31 passes through the first lens 221 and the third quarter-wave plate 26, and the circularly polarized light L31 is transformed into S-type polarized light L5.
  • the S-type polarized light L5 propagates toward the reflective polarizer 27 and is reflected by the reflective polarizer 27.
  • the reflected S-type polarized light L5 passes through the third quarter-wave plate 26 and is converted into circularly polarized light L6.
  • the circularly polarized light L6 then passes through the first lens 221, and a part of the circularly polarized light L62 is transflected by the transflective film. 223 is reflected into the subsequent optical system, and another part of the circularly polarized light L61 passes through the transflective film 223.
  • the optical path of the circularly polarized light L61 passing through the transflective film 223 is as follows: the circularly polarized light L61 passes through the second lens 222 and the second quarter-wave plate 25, and is converted into P-type polarized light L7, and the P-type polarized light L7 is transmitted through After passing through the first transmissive polarizer 24, and then passing through the first quarter-wave plate 23, the circularly polarized light L8 is reflected by the display panel 20 and directed toward the first quarter-wave plate 23. After passing through the first quarter-wave plate 23, L8 is converted into S-type polarized light L9, and the S-type polarized light L9 is absorbed by the first transmissive polarizer 24 and cannot pass through.
  • the stray light that passes through the transflective film 223 and is reflected by the reflective polarizer 27 and passes through the transflective film 223 is finally converted into S-type polarized light and absorbed by the first transmissive polarizer 24. Without entering the subsequent optical system, ghost images will not be generated, which improves the display effect of the display device.
  • the optical path of the circularly polarized light L62 reflected by the transflective film 223 is as follows: the circularly polarized light L62 passes through the first lens 221, and then passes through the third quarter-wave plate 26 again, and the circularly polarized light L62 is converted into P-type polarization.
  • the light L10 and the P-type polarized light L10 pass through the reflective polarizer 27, and then pass through the second transmissive polarizer 28.
  • the second transmissive polarizer 28 and the first transmissive polarizer 24 are both transmissive polarizers of the same type, which can allow P-type polarized light and absorb S-type polarized light.
  • the P-type polarized light L10 passes through the fourth quarter-wave plate 29 and is converted into the circularly polarized light L11, which is finally observed by the human eye on the observation side 21 of the user.
  • the stray light reflected from the transflective film 223 back to the direction of the display panel 20 and the stray light reflected back to the direction of the display panel 20 by the reflective polarizer 27 are finally converted into S-shaped
  • the polarized light is absorbed by the first transmissive polarizer 24 and will not enter the subsequent optical system. Therefore, the light L11 finally observed by the human eye on the user's observation side 21 eliminates stray light, eliminates ghost display, and improves The display effect of virtual reality display is improved.
  • the first lens 221 is a plano-convex lens
  • the second lens 222 is a plano-concave lens
  • the first lens 221 is close to the side of the user's observation side
  • the second lens 222 is close to the display One side of the screen 20.
  • the semi-transmissive and semi-reflective film 223 between the first lens 221 and the second lens 222 is coated and formed on the convex surface of the first lens 221 close to the second lens 222.
  • the first lens and the second lens may also be other types of lenses, for example, the first lens is a double convex lens, or the second lens is a double convex lens.
  • the lens of the virtual reality display device may also include more than two lenses.
  • the transmission axes of the first transmissive polarizer 24, the second transmissive polarizer 28, and the reflective polarizer 27 can be set to be parallel to each other.
  • the transmission axis directions of the type polarizer 24, the second transmission type polarizer 28, and the reflection type polarizer 27 may also have reasonable errors, for example, there may be an error of ⁇ 2 degrees between the three transmission axis directions.
  • the second transmissive polarizer 28 and the first transmissive polarizer 24 are the same type of polarizer, and both are transmissive polarizers that transmit P-type polarized light and absorb S-type polarized light. sheet.
  • the first transmissive polarizer 24 and the second transmissive polarizer 28 may be reflective polarizers that transmit S-type polarized light and absorb P-type polarized light.
  • the reflective polarizer 27 reflects light in the first polarization direction and transmits light in the second polarization direction. Specifically, the reflective polarizer 27 reflects P-type polarized light and transmits S-type polarized light.
  • the nature of the light L1 does not change after passing through the first quarter-wave plate 23 and remains the light L1.
  • the light L1 then propagates to the first linear polarizer 24, the S-type polarized light L2 in the light L1 passes through the first linear polarizer 24, and the polarized light in other directions including P-type polarized light is absorbed by the first linear polarizer 24.
  • the S-type polarized light L2 then passes through the second quarter-wave plate 25 and is converted into circularly polarized light L3, and then propagates in the direction of the lens group 22.
  • the circularly polarized light L3 passes through the second lens 222 of the lens group 22, a part of the circularly polarized light L31 passes through the transflective film 223 and enters the subsequent lens system, and the other part of the circularly polarized light L32 is reflected by the transflective film 223.
  • the reflected circularly polarized light L32 passes through the second quarter wave plate 25 for the second time.
  • the circularly polarized light L32 is converted into the P-type polarized light L4.
  • the P-type polarized light L4 propagates to the first transmission polarizer 24 and is A transmissive polarizer 24 absorbs and cannot pass through the first transmissive polarizer 24. Therefore, the part of the stray light reflected by the semi-transparent and semi-reflective film 223 will not produce ghost images, which improves the display effect of the display device.
  • the optical path of the circularly polarized light L31 passing through the transflective film 223 into the subsequent lens system is as follows: the circularly polarized light L31 passes through the first lens 221 and the third quarter-wave plate, and the circularly polarized light L31 is transformed into the P-type polarized light L5 .
  • the P-type polarized light L5 propagates to the reflective polarizer 27 and is reflected by the reflective polarizer 27.
  • the reflected P-type polarized light L5 passes through the third quarter-wave plate 26 and is converted into circularly polarized light L6.
  • the circularly polarized light L6 then passes through the first lens 221, and a part of the circularly polarized light L62 is transflected by the transflective film. 223 is reflected into the subsequent optical system, and another part of the circularly polarized light L61 passes through the transflective film 223.
  • the optical path of the circularly polarized light L61 passing through the transflective film 223 is as follows: the circularly polarized light L61 passes through the second lens 222 and the second quarter-wave plate 25, and is transformed into S-type polarized light L7, and S-type polarized light L7 is transmitted through After passing through the first transmissive polarizer 24, and then passing through the first quarter-wave plate 23, the circularly polarized light L8 is reflected by the display panel 20 and directed toward the first quarter-wave plate 23. L8 is converted into P-type polarized light L9 after passing through the first quarter-wave plate 23, and the P-type polarized light L9 is absorbed by the first transmissive polarizer 24 and cannot pass through.
  • the light passing through the transflective film 223 is reflected back by the reflective polarizer 27 and passed through the transflective film 223, and finally converted into P-type polarized light and absorbed by the first transmissive polarizer 24. Without entering the subsequent optical system, ghost images will not be generated, which improves the display effect of the display device.
  • the optical path of the circularly polarized light L62 reflected by the transflective film 223 is as follows: the circularly polarized light L62 passes through the first lens 221, and then passes through the third quarter wave plate 26 again, and the circularly polarized light L62 is converted into S-type polarization.
  • the light L10 and the S-type polarized light L10 pass through the reflective polarizer 27 and then pass through the second transmissive polarizer 28.
  • the second transmissive polarizer 28 and the first transmissive polarizer 24 are both transmissive polarizers of the same type, and can allow S-type polarized light.
  • the S-type polarized light L10 passes through the fourth quarter-wave plate 26 and is converted into the circularly polarized light L11, which is finally observed by the human eyes on the observation side 21 of the user.
  • the second lens 222, the second quarter wave plate 25, the first transmissive polarizer 24, and the first quarter wave plate 23 are in close contact with each other in sequence. Together. If the second lens is a plano-concave lens, the second quarter-wave plate 25, the first transmissive polarizer 24, and the first quarter-wave plate 23 are attached to the plane side of the plano-concave lens in sequence. If the second lens is a double The convex lens, the second quarter-wave plate 25, the first transmissive polarizer 24, and the first quarter-wave plate 23 are sequentially attached to the curved surface of the lenticular lens and are also in a curved state.
  • the first lens 221, the third quarter-wave plate 26, the reflective polarizer 27, the second transmission-type polarizer 28, and the fourth quarter-wave plate 29 are closely attached to each other. If the first lens is a plano-convex lens, the third quarter-wave plate 26, the reflective polarizer 27, the second transmission-type polarizer 28, and the fourth quarter-wave plate 29 are attached to the plane side of the plano-convex lens in sequence, If the first lens is a biconvex lens, the third quarter wave plate 26, the reflective polarizer 27, the second transmission type polarizer 28, and the fourth quarter wave plate 29 are attached to the curved surface of the biconvex lens in sequence, and It is also bent. The above-mentioned optical films are tightly attached to avoid an air layer between the films.
  • the refractive index of the air layer and the refractive index of the film are different, light refraction or reflection will occur. Reduce the optical effect.
  • the above-mentioned disadvantages can be avoided by closely adhering the diaphragms to remove the air layer.
  • the refractive index of the second quarter-wave plate and the second lens are the same or very close, for example, the difference between the refractive indexes of the two is within 0.2, or between the second quarter-wave plate and the second lens An antireflection film is provided; the refractive index of the third quarter wave plate and the first lens are the same, or an antireflection film is provided between the third quarter wave plate and the first lens. As shown in FIG.
  • the refractive index of the second quarter wave plate 25 and the second lens 222 are set to be the same or very close, for example, both The difference of the refractive index is within 0.2, or an anti-reflection coating is provided to prevent the reflection and refraction of the light L32 at the interface between the two, and improve the optical effect.
  • the refractive index of the third quarter-wave plate 26 and the first lens 221 are set to be the same or very close. For example, if the refractive index difference between the two is within 0.2, or an anti-reflection coating is installed, it can prevent the light L6 from producing reflected light at the interface between the two, and then enter the human eye, improving the optical effect.
  • the display panel 20 may be a liquid crystal display panel or an organic light emitting display device.
  • the display panel 20 is a silicon-based micro display panel.
  • the silicon-based miniature display panel is based on a single crystal silicon wafer, and the pixel size is about 1/10 of that of a traditional display. It has the advantages of low power consumption, small size, and high resolution. It is very suitable for close-up virtual reality display devices.
  • FIG. 5 is an example diagram of an implementation in the third embodiment.
  • the same parts as those in the second embodiment will not be repeated here.
  • the difference between the structure shown in FIG. 5 and the second embodiment is that the display panel 20 and the second embodiment
  • a second lens group 30 is also arranged between a quarter wave plate 23, and the second lens group 30 includes an optical lens 31, specifically, the optical lens 31 is a plano-convex lens.
  • the second lens group 30 may also be a plurality of optical lenses, and the plurality of optical lenses may be arranged separately or together.
  • FIG. 6 is an example diagram of another implementation in the third embodiment.
  • a third lens group is also provided between the user viewing side and the fourth quarter wave plate.
  • the lens group 40 includes an optical lens 41, specifically, the optical lens 41 is a double convex lens.
  • the third lens group 40 may also be a plurality of optical lenses, and the plurality of optical lenses may be arranged separately or together.
  • FIG. 7 is an example diagram of another implementation in the third embodiment.
  • a second lens group 30 is further provided between the display panel 20 and the first quarter wave plate 23.
  • the second lens group 30 includes an optical lens 31, specifically, the optical lens 31 is a plano-convex lens.
  • a third lens group 40 is also provided between the user's observation side and the fourth quarter-wave plate.
  • the third lens group 40 includes an optical lens 41, specifically, the optical lens 41 is a double convex lens.
  • the second lens group 30 and the third lens group 40 may also be a plurality of optical lenses, and the plurality of optical lenses may be arranged separately or together.
  • Adding the second lens group and the third lens group can increase the magnification of the image and optimize the parameters such as curvature of field, coma, spherical aberration, astigmatism, etc.
  • the second lens group and the third lens group will also be slightly affected. Stray light reflection.
  • the circularly polarized light L61 transmitted through the transflective film 223 passes through the second lens 222 and the second quarter wave plate 25, and is converted into S-type polarized light L7, S
  • the polarized light L7 passes through the first transmission polarizer 24, and then passes through the first quarter-wave plate 23 to be converted into circularly polarized light L8.
  • the circularly polarized light L8 is not only reflected by the display panel 20, but also reflected by the optical lens 31 If there is no such structure in the embodiment of the present invention, the light reflected by the optical lens 31 will reach the eyes of the user on the observation side 21, causing ghost image display.
  • the stray light reflected by the optical lens 31 is finally absorbed by the first transmissive polarizer, which eliminates ghost images and reduces the mutual influence with the lens group.

Abstract

L'invention concerne un appareil d'affichage de réalité virtuelle qui comprend un panneau d'affichage (20) et un système optique. Le système optique est disposé entre le panneau d'affichage (20) et un côté d'observation d'utilisateur (21) ; le système optique comprend un groupe de lentilles (22) et le groupe de lentilles comprend une première lentille (221), une seconde lentille (222) ainsi qu'un film semi-réfléchissant semi-transparent (223) disposé entre la première (221) et la seconde lentille (222). Une première plaque 1/4 d'onde (23), un premier polariseur de type transmission (24) et une seconde plaque 1/4 d'onde (25) sont disposés entre le panneau d'affichage (20) et le groupe de lentilles (22) en séquence. La lumière parasite réfléchie par le film semi-réfléchissant semi-transparent (223) dans la direction du panneau d'affichage (20) pour la première fois et la lumière parasite transmise à travers le film semi-réfléchissant semi-transparent (223) et propagée dans la direction du panneau d'affichage (20) pour la seconde fois sont finalement converties en lumière dans une seconde direction de polarisation et sont absorbées par le premier polariseur de type transmission (24) sans entrer dans le système optique suivant, de telle sorte que la lumière parasite est éliminée et l'affichage d'image fantôme est éliminé de la lumière qui est finalement observée par les yeux humains au niveau du côté d'observation de l'utilisateur (21) et l'effet d'affichage de l'affichage de réalité virtuelle est amélioré.
PCT/CN2019/096800 2019-06-14 2019-07-19 Dispositif d'affichage de réalité virtuelle WO2020248329A1 (fr)

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