WO2023116202A1 - Appareil d'affichage proche de l'œil, et procédé de réglage de contraste pour appareil d'affichage proche de l'œil - Google Patents

Appareil d'affichage proche de l'œil, et procédé de réglage de contraste pour appareil d'affichage proche de l'œil Download PDF

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Publication number
WO2023116202A1
WO2023116202A1 PCT/CN2022/128556 CN2022128556W WO2023116202A1 WO 2023116202 A1 WO2023116202 A1 WO 2023116202A1 CN 2022128556 W CN2022128556 W CN 2022128556W WO 2023116202 A1 WO2023116202 A1 WO 2023116202A1
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WIPO (PCT)
Prior art keywords
liquid crystal
light
dye liquid
eye display
display device
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PCT/CN2022/128556
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English (en)
Chinese (zh)
Inventor
赵兴明
范真涛
田克汉
Original Assignee
嘉兴驭光光电科技有限公司
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Priority claimed from CN202111600613.5A external-priority patent/CN114355611A/zh
Priority claimed from CN202123298411.8U external-priority patent/CN216901151U/zh
Application filed by 嘉兴驭光光电科技有限公司 filed Critical 嘉兴驭光光电科技有限公司
Publication of WO2023116202A1 publication Critical patent/WO2023116202A1/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

Definitions

  • the present disclosure relates to the field of AR/VR, and in particular to a near-eye display device and a contrast adjustment method of the near-eye display device.
  • AR Augmented Reality
  • AR glasses are one of the important media in the field of augmented reality. 1.
  • the existing AR glasses display system has the problem of low brightness, which leads to the problem of poor contrast when AR glasses are used in bright environments, which limits the promotion of AR glasses.
  • Electrochromic lenses use inorganic transition metal oxides such as WO3, NiO, and IrO, which have problems such as slow response speed and high energy consumption. Twisted nematic liquid crystal light valves are polarization-dependent and need to be matched with linear polarizers, which will lose more than 50% of the incident light. When paired with AR waveguide display systems, the application environment of AR glasses will be limited.
  • the present invention relates to a near-eye display device, comprising:
  • the optical waveguide is used to receive and transmit image light and ambient light, and the optical waveguide includes:
  • an in-coupling unit disposed on the in-coupling region of the waveguide substrate for coupling image light incident thereon into the waveguide substrate;
  • the outcoupling unit is arranged on the outcoupling area of the waveguide substrate, and is used for outcoupling the image light incident thereon to the eyes of the wearer;
  • the dye liquid crystal light valve is arranged on the side of the light waveguide opposite to the wearer, and is used to transmit ambient light to the light waveguide, and the transmittance of ambient light is related to the working voltage of the dye liquid crystal light valve;
  • the controller is configured to adjust the operating voltage of the dye liquid crystal light valve to adjust the contrast between the image light coupled out to the wearer's eyes and the ambient light passing through the dye liquid crystal light valve and the light waveguide.
  • the dye liquid crystal light valve includes: a first conductive electrode covering the first PI alignment film, a second conductive electrode covering the second PI alignment film, and filling the first PI alignment film and the The dye liquid crystal layer between the second PI alignment film.
  • the liquid crystal in the dye liquid crystal layer is in a vertical texture state when the first operating voltage is applied, and is in a planar texture state when the power is turned off.
  • the dye liquid crystal layer includes: 82%-90% liquid crystal, 5%-15% dichroic dye and 1%-4% chiral agent.
  • the alignment directions of the first PI alignment film and the second conductive PI alignment film are perpendicular to each other.
  • the liquid crystal in the dye liquid crystal layer is in a vertically textured state when the first operating voltage is applied, and is in a focal conic textured state when the power is turned off.
  • the dye liquid crystal layer includes: 82%-90% liquid crystal, 5%-15% dichroic dye, 1%-4% chiral agent, 1%-5% Liquid crystal monomer and 2%-7% photoinitiator.
  • the dye liquid crystal layer is filled in a liquid crystal cell, wherein the alignment direction of the first PI alignment film and the second PI alignment film are antiparallel; the dye liquid crystal light valve is formed by the After the dye liquid crystal layer is filled in the liquid crystal cell, the false point is solidified and formed.
  • the first conductive electrode and the second conductive electrode are pixel addressing electrodes, which are used for pattern driving to change the passing area of the ambient light on the dye liquid crystal light valve.
  • the controller is further configured to control the on-off of the pixel address electrodes according to the image content to locally The contrast between the image light coupled out to the wearer's eyes and the ambient light passing through the dye liquid crystal light valve and the light waveguide is adjusted.
  • the dichroic dye is any one or a combination of three primary colors.
  • the dye liquid crystal light valve is connected to the optical waveguide through optical glue
  • an air layer is set between the dye liquid crystal light valve and the optical waveguide
  • the optical waveguide includes a diffractive optical waveguide, Any of volume holographic waveguide, array waveguide, and free-form surface prism waveguide.
  • the dye liquid crystal light valve is detachably connected to the optical waveguide.
  • the near-eye display device further includes: an optical machine configured to output the image light, and the controller is coupled to the optical machine and configured to adjust the output of the optical machine.
  • the brightness and contrast of the image light is coupled to the optical machine and configured to adjust the output of the optical machine.
  • the optical machine includes any one of Microled optical machine, DLP optical machine, Lcos optical machine, and MEMS optical machine.
  • the controller is further configured to control the dye liquid crystal light valve to be powered on or off, so that the near-eye display device switches between the AR mode and the VR mode.
  • the near-eye display device further includes an ambient light sensor for sensing the brightness of the ambient light, and the controller communicates with the ambient light sensor and is configured to, based on the brightness of the ambient light, adjusting the operating voltage of the dye liquid crystal light valve.
  • the near-eye display device further includes a user operation interface configured to receive user input on the contrast between image light and ambient light
  • the controller is coupled to the user operation interface, and It is configured to adjust the operating voltage of the dye liquid crystal light valve according to the user input, so as to adjust the contrast between the image light coupled out to the eyes of the wearer and the ambient light passing through the dye liquid crystal light valve and the light waveguide.
  • the present invention also relates to a method for adjusting the contrast of the near-eye display device as described above, including:
  • the operating voltage of the dye liquid crystal light valve of the near-eye display device is adjusted to adjust the coupling between the image light coupled out to the wearer's eyes and passing through the dye liquid crystal light valve and the Contrast of ambient light behind the light guide.
  • the present invention designs a near-eye display device with a dye liquid crystal light valve and an AR waveguide, which can regulate the ambient light transmittance in a wide range and solve the problem of poor contrast of image light superimposed on ambient light. Due to the dichroism in the dye liquid crystal light valve There are various colors of dyes, which can also expand the color gamut width of the display device, which can make the near-eye display device as fashionable and full of technological sense as sunglasses.
  • FIG. 1 shows a schematic diagram of a near-eye display device according to an embodiment of the present invention
  • Fig. 2 shows a schematic diagram of an optical path of a near-eye display device according to yet another embodiment of the present invention
  • Fig. 3 shows a schematic diagram of a dye liquid crystal light valve according to an embodiment of the present invention
  • Figure 4a shows a schematic diagram of the comparison of two states of the first dye liquid crystal light valve according to an embodiment of the present invention
  • Figure 4b shows a schematic diagram of the operating voltage VS ambient light transmittance curve of the first dye liquid crystal light valve
  • Fig. 4c shows a schematic diagram of a near-eye display device using the first dye liquid crystal light valve according to an embodiment of the present invention
  • Figure 5a shows a schematic diagram of the comparison of two states of the second dye liquid crystal light valve according to an embodiment of the present invention
  • Figure 5b shows a schematic diagram of the operating voltage VS ambient light transmittance curve of the second dye liquid crystal light valve
  • Fig. 5c shows a schematic diagram of a near-eye display device using a second dye liquid crystal light valve according to an embodiment of the present invention
  • Fig. 6 shows a schematic diagram of a near-eye display device of a pixelated dye liquid crystal light valve according to an embodiment of the present invention
  • Fig. 7 shows a schematic diagram of a near-eye display device using an ambient light sensor according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • a feature defined as “first” or “second” may explicitly or implicitly include one or more of said features.
  • “plurality” means two or more, unless otherwise specifically defined.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection.
  • Connected, or integrally connected it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation.
  • a first feature being “on” or “under” a second feature may include that the first and second features are in direct contact, or may include the first and second features Not in direct contact but through another characteristic contact between them.
  • “on”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature.
  • “Below”, “below” and “under” the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the level of the first feature is smaller than that of the second feature.
  • FIG. 1 shows a schematic diagram of a near-eye display device according to an embodiment of the present invention.
  • the near-eye display device 100 includes an optical waveguide 10 , a dye liquid crystal light valve 20 and a controller 30 . specifically:
  • the optical waveguide 10 is used to receive and transmit image light and ambient light.
  • the optical waveguide 10 includes a waveguide substrate 11 , an in-coupling unit 12 and an out-coupling unit 13 .
  • the waveguide substrate 11 is used as a medium for transmitting image light and ambient light, and an in-coupling unit 12 and an out-coupling unit 13 are arranged thereon.
  • the coupling unit 12 is disposed in the coupling area of the waveguide substrate 11 for coupling image light incident thereon into the waveguide substrate 11 .
  • the outcoupling unit 13 is arranged in the outcoupling area of the waveguide substrate 11 and is used for outcoupling the image light incident thereon to the eyes of the wearer.
  • the near-eye display device 100 further includes an optical engine 40 for outputting image light.
  • the optical waveguide 10 is, for example, a diffractive optical waveguide.
  • the image light is coupled into the waveguide substrate 11 through the in-coupling unit 12, and then is incident on the out-coupling unit 13 after multiple times of total reflection.
  • the output unit 13 emits light, part of the image light continues to be totally reflected, and finally all the image light is coupled out to the eyes of the wearer.
  • the optical waveguide 10 can be any one of a diffractive optical waveguide, a volume holographic optical waveguide, an array optical waveguide, and a free-form surface prism waveguide.
  • a diffractive optical waveguide a volume holographic optical waveguide
  • an array optical waveguide an array optical waveguide
  • a free-form surface prism waveguide a free-form surface prism waveguide.
  • the dye liquid crystal light valve 20 is arranged on the side of the light waveguide 10 opposite to the wearer, and is used to transmit ambient light to the light waveguide 10 .
  • the transmittance of ambient light is related to the working voltage of the dye liquid crystal light valve 20 .
  • a liquid crystal light valve is a device that changes the light transmittance by controlling the spatial arrangement of liquid crystal molecules through voltage. Dissolving the dichroic dye in the liquid crystal can form a guest-host relationship, the liquid crystal is the host (Host), and the dichroic dye is the guest (Guest). Under the action of an external electric field, the dye molecules rotate with the liquid crystal molecules, and the light transmittance can be adjusted by absorbing or reflecting light.
  • dichroic dyes have the property of light absorbance anisotropy, and dichroic dyes can be divided into positive dichroic dyes and negative dichroic dyes according to the orientation relationship between the absorption axis of the dye molecule and the molecular axis.
  • the light When the E vector of the light is perpendicular to the optical axis of the dichroic dye, the light basically passes through; when the E vector of the light is parallel to the optical axis of the dichroic dye, the light is basically absorbed.
  • Such dyes are positive dichroic dyes.
  • Negative dichroic dyes are just the opposite. According to the characteristics of positive and negative dyes, light is absorbed or transmitted, thereby changing the transmittance of the liquid crystal layer.
  • Dye liquid crystal light valves use dichroic dyes to selectively transmit light without polarizers, which can meet the performance requirements of light valves.
  • the dye liquid crystal light valve 20 includes: a first conductive electrode 21 covering a first PI alignment film 24, a second conductive electrode 22 covering a second PI alignment film 25, and filling in The dye liquid crystal layer 23 between the first PI alignment film 24 and the second PI alignment film 25 .
  • the first conductive electrode 21 and the second conductive electrode 22 are preferably integral surface electrodes, such as indium tin oxide (Indium Tin Oxide, ITO) or indium zinc oxide (Indium Zinc Oxide, IZO) and other transparent Made of conductive material.
  • the upper surface of the first conductive electrode 21 is covered with the first PI alignment film 24 and the lower surface of the second conductive electrode 22 is covered with the second PI alignment film 25, between the first PI alignment film 24 and the second PI alignment film 25
  • the dye liquid crystal layer 23 is filled in between.
  • an insulating layer (not shown in FIG. 3 ) is provided between the first conductive electrode 21 and the first PI alignment film 24 and between the second conductive electrode 22 and the second PI alignment film 25 .
  • the dye liquid crystal light valve 20 When making the dye liquid crystal light valve 20, first spin-coat polyimide (PI) on the surface of transparent conductive glass; then use a rubbing machine to carry out directional rubbing on its surface, and directional rubbing makes the PI surface directional anchoring energy, and can make the liquid crystal Generate a pre-tilt angle; then cut the oriented transparent conductive glass into a special shape and then paste it into a liquid crystal cell; finally pour the dye liquid crystal mixture into the liquid crystal cell to form a dye liquid crystal light valve.
  • the PI orientation direction of the transparent conductive glass surface is divided into two types, the first one is vertical, and the second one is antiparallel. The description here is only an example, and the present invention does not limit the manufacturing method of the dye liquid crystal light valve.
  • the liquid crystal in the dye liquid crystal layer 23 is in a homeotropic texture state (homeotropic texture) at the first operating voltage, and is in a planar texture state (planar texture) when the power is off.
  • Figure 4a shows a schematic diagram of the comparison of the two states of the first dye liquid crystal light valve of an embodiment of the present invention, because the liquid crystal molecules are polar molecules, due to the force between molecules, when the liquid crystal molecules are assembled together, the molecular length
  • the axes are always parallel to each other or have a preferred direction.
  • the unit vector of the average tendency of the long axis of the liquid crystal molecules is called the director of the liquid crystal.
  • the director is generally determined by the polar angle and the azimuth angle, which describes the alignment direction of the liquid crystal molecules in space and can characterize the macroscopic structure and state of the liquid crystal.
  • a voltage is applied to the dye liquid crystal light valve 20
  • the liquid crystal molecules go from one equilibrium state to another equilibrium state.
  • the state of the dye liquid crystal layer 23 is a vertical texture state; when the voltage is turned off, the state of the dye liquid crystal layer 23 is a planar texture state.
  • Adjusting the operating voltage applied to the dye liquid crystal light valve 20 can adjust the molecular arrangement in the dye liquid crystal layer 23. Referring to FIG. 20 working voltage to adjust the transmittance of ambient light.
  • the dye liquid crystal layer 23 when the operating voltage is 0V, the dye liquid crystal layer 23 is in a planar texture state, the dye liquid crystal light valve 20 is turned off, and the ambient light transmittance is about 21%; when the operating voltage is 5V, the dye liquid crystal layer The layer 23 is in a vertical texture state, and the ambient light transmittance is about 90%. When the operating voltage is 2.5V, the dye liquid crystal layer 23 is in an intermediate state, and the ambient light transmittance is about 55%. That is, when the operating voltage is adjusted between 0V and 5V, the ambient light transmittance can be controlled to vary between 21%-90%.
  • the first dye liquid crystal layer includes: 82%-90% liquid crystal, 5%-15% dichroic dye and 1%-4% chiral agent.
  • liquid crystals such as E7, SLC092315-200, SLC131330-000, etc.
  • chiral agents such as R6N, S811, R1011, CB15, etc.
  • dichroic dyes mixed according to a certain ratio, wherein the dichroic dye has a rod-like structure.
  • liquid crystals account for 82%-90%
  • dichroic dyes account for 5%-15%
  • chiral agents account for 1%-4%.
  • the proportion of dichroic dyes is related to the dimming of the final dye liquid crystal light valve range dependent.
  • the above materials are mixed to form a dye liquid crystal, and the dye liquid crystal is poured into the liquid crystal cell through capillary suction to form the first type of dye liquid crystal light valve.
  • the description here is only an example, and the present invention does not limit the manufacturing method of the dye liquid crystal light valve.
  • the first dye liquid crystal layer is filled in the liquid crystal cell, and the alignment directions of the first PI alignment film 24 and the second PI alignment film 25 are perpendicular to each other.
  • the liquid crystal in the dye liquid crystal layer 23 is in a homeotropic texture state (homeotropic texture) at the first operating voltage, and is in a focal conic texture state (focal conic texture) when the power is off.
  • Figure 5a shows a schematic diagram of the comparison of two states of the second dye liquid crystal light valve according to an embodiment of the present invention. For example, when the first operating voltage is applied to the dye liquid crystal light valve 20, the state of the dye liquid crystal layer 23 is a vertical texture State: when the voltage is turned off, the state of the dye liquid crystal layer 23 is a focal conic texture state. It can be seen that adjusting the operating voltage applied to the dye liquid crystal light valve 20 can adjust the molecular arrangement in the dye liquid crystal layer 23.
  • the operating voltage of the dye liquid crystal light valve 20 is used to adjust the transmittance of ambient light. 5b and 5c, when the operating voltage is 0V, the dye liquid crystal layer 23 is in the state of focal conic texture, the dye liquid crystal light valve 20 is turned off, and the ambient light transmittance is about 8%; when the operating voltage is 8V, the dye The liquid crystal layer 23 is in a vertical texture state, and the ambient light transmittance is about 90%; when the operating voltage is 4V, the dye liquid crystal layer 23 is in an intermediate state, and the ambient light transmittance is about 50%. That is, when the operating voltage is adjusted between 0V and 8V, the ambient light transmittance can be controlled to vary between 8%-90%.
  • the second dye liquid crystal layer includes: 82%-90% liquid crystal, 5%-15% dichroic dye, 1%-4% chiral agent, 1%-5 % liquid crystal monomer and 2%-7% photoinitiator.
  • liquid crystals such as E7, SLC092315-200, SLC131330-000, etc.
  • chiral agents such as R6N, S811, R1011, CB15, etc.
  • dichroic dyes liquid crystal monomers (such as RM82, RM257, PFDA, 2-EHA, etc.) %-15%
  • chiral agent accounts for 1%-4%
  • liquid crystal monomer accounts for 1%-5%
  • photoinitiator accounts for 2%-7%.
  • the above materials are mixed to form a dye liquid crystal, and the dye liquid crystal is poured into a liquid crystal cell through capillary suction to form a second type of dye liquid crystal light valve.
  • the description here is only an example, and the present invention does not limit the manufacturing method of the dye liquid crystal light valve.
  • the second dye liquid crystal layer is filled in the liquid crystal cell, wherein the alignment directions of the first PI alignment film 24 and the second PI alignment film 25 are antiparallel; the dye liquid crystal light valve 20 is controlled by the second PI alignment film.
  • the dye liquid crystal layer is filled in the liquid crystal cell and then cured with electricity.
  • the liquid crystal state and the ambient light transmittance of the dye liquid crystal light valve 20 through two dye liquid crystal layers 23 with different composition ratios For the first dye liquid crystal light valve, the liquid crystal forms a planar texture state under the joint effect of the anchoring effect of the alignment layer and the twisting effect of the chiral agent.
  • the helical structure has a certain absorption of light; when electricity is applied to both ends of the liquid crystal cell, the long axis of the liquid crystal is parallel to the electric field under the action of the electric field. At this time, the liquid crystal is in a vertical texture state, and the dye follows the orientation of the liquid crystal chip.
  • the dye and the liquid crystal grow
  • the axis is parallel to the optical axis of the liquid crystal cell, and there is no absorption of light, so the liquid crystal cell is transparent.
  • the liquid crystal monomer in the mixed liquid crystal is cured with ultraviolet light, and the power is removed after curing.
  • the liquid crystal is anchored by the polymer grid, and the chirality Function, liquid crystal alignment and anchoring to form a focal conic texture state, the liquid crystals are scattered, and the dyes are already scattered.
  • the dyes have a strong absorption of light, and the absorption of light does not depend on polarization.
  • Both dye liquid crystal light valves have good ambient light transmittance and a large adjustable dynamic range, which can effectively solve the problem of poor contrast of existing AR display devices in bright environments.
  • the dye liquid crystal light valve 20 is connected with the optical waveguide 10 through optical glue, and an air layer is set between the dye liquid crystal light valve 20 and the optical waveguide 10 to prevent the dye liquid crystal light valve 20 from Image light transmission inside the optical waveguide is negatively affected.
  • optical glue is provided between the first conductive electrode 21 and the second conductive electrode 22 to isolate the positive and negative electrodes.
  • the controller 30 is configured to adjust the operating voltage of the dye liquid crystal light valve 20 to adjust the contrast between the image light coupled out to the wearer's eyes and the ambient light passing through the dye liquid crystal light valve 20 and the optical waveguide 10 .
  • the controller 30 is connected to the first conductive electrode 21 and the second conductive electrode 22 of the dye liquid crystal light valve 20, and is used to adjust the working voltage applied to the dye liquid crystal light valve 20, thereby changing the ambient light transmittance.
  • the near-eye display device 100 further includes: an optical machine 40 configured to output image light.
  • the controller 30 is coupled to the optical machine 40 and configured to adjust the image output by the optical machine 40 Brightness and contrast of light. Cooperating with the dye liquid crystal light valve 20 to adjust the light transmittance of the ambient light, the problem of poor contrast of the image light superimposed on the ambient light can be solved.
  • the optical machine 40 includes any one of Microled optical machine, DLP optical machine, Lcos optical machine, and MEMS optical machine.
  • the types of optomechanics mentioned above are all prior art, and will not be repeated here.
  • the present invention uses the optical waveguide 10 as the image display window, and the image light emitted by the optical machine 40 is projected to the coupling unit 12 of the optical waveguide 10, and is transmitted to the coupling unit 13 in the waveguide substrate 11, and then coupled out into the wearable In the wearer's eyes, the ambient light enters the wearer's eyes after being transmitted through the dye liquid crystal light valve 20 and the optical waveguide 10, and the image light and the ambient light are superimposed to achieve the effect of mixing virtual reality and reality.
  • the technical solution of the present invention is used to adjust the contrast between the image light and the ambient light, effectively solving the problem of poor contrast in the prior art when the image light is directly superimposed on the ambient light.
  • the first conductive electrode 21 and the second conductive electrode 22 of the dye liquid crystal light valve 20 are pixel addressing electrodes, which are used for patterned driving to change the passing area of ambient light on the dye liquid crystal light valve .
  • the conductive electrodes of the dye liquid crystal light valve 20 use pixel addressing electrodes, that is, the electrodes can be driven pixelated.
  • the dye liquid crystal light valve 20 can be driven in a pattern because the driving electrode is a pixel addressing electrode.
  • the content of the image displayed by the optical waveguide 10 is the number "9"
  • the controller 30 powers on the pixel electrodes to be driven according to the content of the image
  • the area corresponding to the image "9" of the dye liquid crystal light valve 20 appears a graphical distribution.
  • the controller 30 applies a working voltage to the electrodes in this region, and the working voltage can be adjusted, and the other regions are powered off, so as to accurately control the contrast between the ambient light and the image light.
  • the first conductive electrode 21 and the second conductive electrode 22 in the dye liquid crystal light valve 20 are pixel addressing electrodes
  • the controller 30 is also configured to control the on-off of the pixel addressing electrodes according to the image content , to locally adjust the contrast between the image light coupled out to the wearer's eyes and the ambient light passing through the dye liquid crystal light valve and the light waveguide.
  • pixelated liquid crystal light valves ambient light does not need to pass through the areas where the content is not displayed, and for areas where the optical waveguide displays content, the liquid crystal light valve can be driven by pixelation, so that the contrast of the optical waveguide display content can be locally adjusted.
  • the dichroic dye in the dye liquid crystal light valve 20 is any one or a combination of multiple primary colors.
  • the color of the dichroic dye is one of the three primary colors of red, green or blue, or a combination of multiple colors to expand the color gamut, making the near-eye display device 100 full of fashion and technology like sunglasses.
  • the dye liquid crystal light valve 20 is detachably connected with the optical waveguide 10.
  • the dye liquid crystal light valve 20 used to control the transmittance of ambient light can be removed, so that the ambient light can pass through the optical waveguide 10 to the maximum and then enter the wearer's eyes. .
  • the controller 30 is further configured to control the dye liquid crystal light valve 20 to be powered on or off, so that the near-eye display device 100 switches between the AR mode and the VR mode.
  • the controller 30 is further configured to control the dye liquid crystal light valve 20 to be powered on or off, so that the near-eye display device 100 switches between the AR mode and the VR mode.
  • the ambient light transmittance is about 90%, and the wearer can see the ambient light and the real scene of the environment, and can also see the virtual image formed by the image light.
  • the near-eye display device is in AR mode; when the second dye liquid crystal light valve is powered off, the ambient light transmittance is about 8%, and the wearer can hardly see the ambient light and the real scene of the environment, but can see the image formed by the light Virtual image, at this time, the near-eye display device is in VR mode.
  • the near-eye display device 100 further includes an ambient light sensor 50 for sensing the brightness of the ambient light
  • the controller 30 communicates with the ambient light sensor 50, and is configured to adjust the brightness based on the ambient light The operating voltage of the dye liquid crystal light valve 20.
  • the ambient light brightness is collected by the ambient light sensor and fed back to the controller 30.
  • the controller 30 can dynamically adjust the ambient light transmittance of the dye liquid crystal light valve 20, thereby changing the brightness of the ambient light entering the wearer's eyes, reducing eye strain. It reduces facial fatigue and does not require manual adjustment by the wearer, improving user experience.
  • the near-eye display device 100 further includes a user operation interface configured to receive user input on the contrast between image light and ambient light, and the controller 30 is coupled to the user operation interface and configured to The operating voltage of the dye liquid crystal light valve 20 is adjusted according to user input to adjust the contrast between the image light coupled out to the wearer's eyes and the ambient light passing through the dye liquid crystal light valve 20 and the optical waveguide 10 .
  • the near-eye display device 100 can automatically adjust the ambient light transmittance based on the ambient light sensor 50 , and can also switch from the automatic mode to the manual mode by receiving instructions from the wearer, so as to meet the needs of different wearers and improve user experience.
  • the present invention also relates to a method for adjusting the contrast of the near-eye display device 100 as described above, including:
  • the operating voltage of the dye liquid crystal light valve 20 of the near-eye display device 100 is adjusted to adjust the amount of image light coupled out to the wearer's eyes and after passing through the dye liquid crystal light valve 20 and the optical waveguide 10. The contrast of the ambient light.

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Abstract

L'invention concerne un appareil d'affichage proche de l'œil (100) comprenant : un guide d'ondes optique (10), qui est utilisé pour recevoir et transmettre une lumière d'image et une lumière ambiante, le guide d'ondes optique (10) comprenant un substrat de guide d'ondes (11) ; une unité de couplage intérieur (12), qui est disposée dans une zone de couplage intérieur du substrat de guide d'ondes (11) et est utilisée pour coupler une lumière d'image incidente sur celle-ci dans le substrat de guide d'ondes (11) ; une unité de couplage extérieur (13), qui est disposée dans une zone de couplage extérieur du substrat de guide d'ondes (11) et qui est utilisée pour coupler la lumière d'image à l'extérieur des yeux d'un porteur ; une valve de lumière à cristaux liquides colorés (20), qui est disposée sur le côté du guide d'ondes optique (10) opposé au porteur et est utilisée pour transmettre la lumière ambiante au guide d'ondes optique (10), la transmittance de la lumière ambiante étant associée à une tension de fonctionnement de la valve de lumière à cristaux liquides colorés (20) ; et un dispositif de commande (30), qui est configuré pour pouvoir ajuster la tension de fonctionnement de la valve de lumière à cristaux liquides colorés (20), de façon à régler le contraste entre la lumière d'image couplée à l'extérieur des yeux du porteur et la lumière ambiante traversant la valve de lumière à cristaux liquides colorés (20) et le guide d'ondes optique (10). La transmittance de la lumière ambiante peut être régulée et commandée dans une plage relativement large, le problème du contraste de la lumière d'image superposée à la lumière ambiante qui est médiocre est résolu, et la largeur de gamme de couleurs de l'appareil d'affichage peut également être étendue, de telle sorte que l'appareil d'affichage est à la fois élégant et présente une sensation de haute technologie.
PCT/CN2022/128556 2021-12-24 2022-10-31 Appareil d'affichage proche de l'œil, et procédé de réglage de contraste pour appareil d'affichage proche de l'œil WO2023116202A1 (fr)

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