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WO2019196865A1 - Vr透镜结构及显示装置 - Google Patents

Vr透镜结构及显示装置 Download PDF

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Publication number
WO2019196865A1
WO2019196865A1 PCT/CN2019/082053 CN2019082053W WO2019196865A1 WO 2019196865 A1 WO2019196865 A1 WO 2019196865A1 CN 2019082053 W CN2019082053 W CN 2019082053W WO 2019196865 A1 WO2019196865 A1 WO 2019196865A1
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WO
WIPO (PCT)
Prior art keywords
lens
curvature
radius
fresnel
structure according
Prior art date
Application number
PCT/CN2019/082053
Other languages
English (en)
French (fr)
Inventor
陈寅伟
张雪冰
刘亚丽
孙志宇
张�浩
孙海威
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to JP2020527766A priority Critical patent/JP7353282B2/ja
Priority to US16/638,248 priority patent/US11294183B2/en
Priority to EP19785959.8A priority patent/EP3779563A4/en
Publication of WO2019196865A1 publication Critical patent/WO2019196865A1/zh

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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
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/001—Eyepieces
    • 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
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00—Manipulating 3D models or images for computer graphics
    • G06T19/006—Mixed reality
    • 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
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
    • 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
    • G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems

Definitions

  • the present disclosure belongs to the field of display technologies, and in particular, to a VR lens structure and a display device.
  • one design approach is to increase the visual field of view to increase immersion.
  • Embodiments of the present disclosure provide a VR lens structure and a display device.
  • An aspect of the present disclosure provides a VR lens structure including: a first lens and a second lens disposed opposite to each other; wherein
  • the first lens has opposite first and second sides, and at least one of the first side and the second side is aspherical;
  • the second lens is a Fresnel lens, and a smooth surface of the second lens is disposed adjacent to the second side, and a Fresnel surface of the second lens is farther away from the second side than the light surface Settings.
  • the first side and the second side of the first lens are both aspherical;
  • An intermediate portion of the first side surface projects in a direction away from the second side surface, the edge region protruding toward a direction toward the second side surface;
  • the second side surface protrudes in a direction away from the first side surface.
  • the first side and the second side of the first lens are both aspherical;
  • the first side protrudes away from the second side
  • the second side surface protrudes in a direction away from the first side surface.
  • the smooth side of the second lens comprises a plane or an aspherical surface.
  • the smooth surface of the second lens is aspherical and protrudes away from the Fresnel surface.
  • the first lens has a refractive index of from 1.55 to 1.70.
  • the spacing between any two adjacent threads on the Fresnel surface of the second lens is between 0.2 mm and 0.7 mm.
  • the depth of the thread on the Fresnel surface is different, and the deeper the depth of the thread, the greater the draft angle of the thread.
  • the first lens has a power of ⁇ 1
  • the second lens has a power of ⁇ 2
  • the diameter of the first lens is smaller than the diameter of the second lens.
  • the radius of curvature of the intermediate portion of the first side of the first lens is: 99.935 mm ⁇ 0.1 mm, and the radius of curvature of the second side is -49.709 mm ⁇ 0.1 mm; the thickness of the first lens 8.16 mm ⁇ 0.1 mm; the refractive index of the first lens is 1.4918 ⁇ 0.01;
  • the radius of curvature of the smooth surface of the second lens is: 223.181 mm ⁇ 0.1 mm, the radius of curvature of the Fresnel surface is -41.2 mm ⁇ 0.1 mm; the thickness of the second lens is 4.469 mm; the second lens
  • the refractive index is 1.4918 ⁇ 0.01.
  • the first value “ ⁇ ” in the present disclosure includes the second value between: the value obtained by the first value “+” the second value and the value obtained by the first value “-” the second value. Any value (including one of the values of the two endpoints).
  • the radius of curvature of the intermediate portion of the first side of the first lens is: 89.442 mm ⁇ 0.1 mm, and the radius of curvature of the second side is -59.286 mm ⁇ 0.1 mm; the thickness of the first lens Is 9.847 mm ⁇ 0.1 mm; the refractive index of the first lens is 1.4918 ⁇ 0.01;
  • the radius of curvature of the smooth surface of the second lens is: 0 mm ⁇ 0.1 mm, the radius of curvature of the Fresnel surface is -63.253 mm ⁇ 0.1 mm; the thickness of the second lens is 2.0 mm ⁇ 0.1 mm; The refractive index of the two lenses is 1.4918 ⁇ 0.01.
  • the first side of the first lens has a radius of curvature of: 72.002 mm ⁇ 0.1 mm, the second side has a radius of curvature of -283.789 mm ⁇ 0.1 mm; and the first lens has a thickness of 6.729 mm. ⁇ 0.1 mm; the first lens has a refractive index of 1.68879 ⁇ 0.01;
  • the radius of curvature of the smooth surface of the second lens is: 0 mm ⁇ 0.1 mm, the radius of curvature of the Fresnel surface is -58.943 mm ⁇ 0.1 mm; the thickness of the second lens is 2.0 mm ⁇ 0.1 mm; The refractive index of the two lenses is 1.4918 ⁇ 0.01.
  • Another aspect of the present disclosure provides a display device, the display device comprising:
  • the Fresnel surface of the second lens is disposed closer to the display panel than the light surface.
  • the center points of the first lens, the second lens, and the display panel are on the same line; and the center point of the display panel to the second lens of Fresnel The distance between the center points of the ridges is less than the effective focal length of the VR lens structure.
  • the radius of curvature of the intermediate portion of the first side of the first lens is: 99.935 mm ⁇ 0.1 mm, and the radius of curvature of the second side is -49.709 mm ⁇ 0.1 mm; the thickness of the first lens Is 8.160 mm ⁇ 0.1 mm; the refractive index of the first lens is 1.4918 ⁇ 0.01;
  • the radius of curvature of the smooth surface of the second lens is: 223.181 mm ⁇ 0.1 mm, the radius of curvature of the Fresnel surface is -41.2 mm ⁇ 0.1 mm; the thickness of the second lens is 4.469 mm ⁇ 0.1 mm;
  • the refractive index of the second lens is 1.4918 ⁇ 0.01;
  • the distance from the center point of the display panel to the center point of the Fresnel surface of the second lens is 32.945 mm ⁇ 0.1 mm.
  • the radius of curvature of the intermediate portion of the first side of the first lens is: 89.442 mm ⁇ 0.1 mm, and the radius of curvature of the second side is -59.286 mm ⁇ 0.1 mm; the thickness of the first lens Is 9.847 mm ⁇ 0.1 mm; the refractive index of the first lens is 1.4918 ⁇ 0.01;
  • the radius of curvature of the smooth surface of the second lens is: 0 mm ⁇ 0.1 mm, the radius of curvature of the Fresnel surface is -63.253 mm ⁇ 0.1 mm; the thickness of the second lens is 2.0 mm ⁇ 0.1 mm; The refractive index of the two lenses is 1.4918 ⁇ 0.01;
  • the distance between the center point of the display panel to the center point of the Fresnel surface of the second lens is 30.185 mm ⁇ 0.1 mm.
  • the first side of the first lens has a radius of curvature of: 72.002 mm ⁇ 0.1 mm, the second side has a radius of curvature of -283.789 mm ⁇ 0.1 mm; and the first lens has a thickness of 6.729 mm. ⁇ 0.1 mm; the refractive index of the first lens is 1.68879 ⁇ 0.01;
  • the radius of curvature of the smooth surface of the second lens is: 0 mm ⁇ 0.1 mm, the radius of curvature of the Fresnel surface is -58.943 mm ⁇ 0.1 mm; the thickness of the second lens is 2.0 mm ⁇ 0.1 mm; The refractive index of the two lenses is 1.4918 ⁇ 0.01;
  • the distance between the center point of the display panel to the center point of the Fresnel surface of the second lens is 33.021 mm ⁇ 0.1 mm.
  • FIG. 1 is a schematic diagram of a VR lens structure and a display device according to an embodiment of the present disclosure
  • FIG. 2A and 2B are schematic diagrams showing field curvature curves of a VR lens structure of the embodiment shown in FIG. 1;
  • 2C is a dot-column diagram of the diffuse plaque of the VR lens structure of the embodiment of FIG. 1 at its focal length position;
  • FIG. 3 is a schematic diagram showing a distortion curve of a VR lens structure of the embodiment shown in FIG. 1 according to the present disclosure
  • FIG. 4 is a schematic diagram of another VR lens structure and another display device according to an embodiment of the present disclosure.
  • FIG. 5A and FIG. 5B are schematic diagrams of field curvature curves of the VR lens structure of the embodiment shown in FIG. 4 according to the present disclosure
  • FIG. 6 is a schematic diagram showing a distortion curve of a VR lens structure of the embodiment shown in FIG. 4 according to the present disclosure
  • FIG. 7 is a schematic diagram of another VR lens structure and another display device according to an embodiment of the present disclosure.
  • FIG. 8A and 8B are schematic diagrams of field curvature curves of the VR lens structure of the embodiment shown in FIG. 7 of the present disclosure
  • FIG. 9 is a schematic diagram showing a distortion curve of the VR lens structure of the embodiment shown in FIG. 7 of the present disclosure.
  • a VR (Virtual Reality) display device in order to obtain a better visual experience, one design method is to increase the visual field of view to increase immersion.
  • a conventional VR lens employing a single lens has a small field of view angle due to the limitation of the eye distance. Even if human-computer interaction is neglected and the eyesight is forcibly reduced to increase the viewing angle, there is a problem of single lens aberration and severe distortion, which affects the experience. Therefore, the single-lens VR optical path structure is limited by the curvature and thickness of the lens, and it is difficult to achieve the effect of the binocular integrated field of view exceeding 120°.
  • An embodiment of the present disclosure provides a VR lens structure including: a first lens and a second lens disposed opposite to each other; wherein the first lens has opposite first and second sides, and the first side and the second side At least one of them is an aspherical surface; the second lens is a Fresnel lens having a Fresnel surface and a light surface disposed opposite to each other, and the light surface of the second lens is disposed adjacent to the second side surface of the first lens, The Fresnel surface of the second lens is disposed away from the second side than the light side.
  • the Fresnel surface of the second lens is a surface provided with a thread (or concentric circle), that is, a surface that substantially changes the direction of propagation of the light.
  • the smooth surface of the second lens is a surface opposite to the Fresnel surface.
  • the VR lens structure in this embodiment is composed of two lenses, that is, a first lens and a second lens
  • the VR lens structure is applied to a display device having four optical effective faces, that is, a first side, a second side of the lens, and a Fresnel surface and a smooth surface of the second lens; thus, when designing the VR lens structure, parameters of the four optical effective surfaces can be set so that The formed VR lens structure has a larger viewing angle and a better structure when applied to a display device, enhancing the user experience.
  • the spacing between any two adjacent threads on the Fresnel surface of the second lens is set to 0.2 mm to 0.7 mm, and the thread depth is different, and the thread depth is deeper.
  • the power of the first lens of the VR lens structure is set to ⁇ 1
  • the power of the second lens is set to ⁇ 2, and both satisfy the following formula: 0.8 ⁇ 1 ⁇ 2 ⁇ 2 ⁇ 1;
  • the setting method can not only make the virtual viewing device applying the VR lens structure have a single-eye viewing angle FOV greater than 115°, and the binocular FOV reaches 130°, thereby achieving a larger field of view range and increasing display immersion.
  • the device of the single lens can provide a larger field of view of the virtual reality device, and at the same time reduce the size of the overall device, especially the screen, and obtain a compact VR display device.
  • Embodiments of the present disclosure provide a VR lens structure and a display device to which the VR lens structure is applied.
  • the VR lens structure includes the first lens 1 and the second lens 2 disposed opposite to each other, as shown in FIG.
  • the first lens 1 is an aspherical lens, that is, the first side surface S1 and the second side surface S2 of the first lens 1 are both aspherical.
  • the first side surface S1 may be referred to as a first aspheric surface
  • the second side surface S2 may be referred to as a second aspheric surface.
  • the intermediate portion of the first aspherical surface protrudes away from the second aspherical surface, and the edge region protrudes toward the second aspherical surface.
  • the second aspherical surface protrudes away from the first aspherical surface.
  • the second lens 2 is a Fresnel lens, and the smooth surface S4 of the second lens 2 is aspherical and protrudes in a direction away from the Fresnel surface S3.
  • the VR lens structure in this embodiment is composed of two lenses, that is, the first lens 1 having two aspherical surfaces and the second lens 2 having the Fresnel lens, and the smooth surface of the Fresnel lens is also aspherical. That is to say, in the present embodiment, the first lens 1 and the second lens 2 are both aspherical lenses, which is advantageous for controlling the refractive direction of the light to achieve a large viewing angle and enhancing the user experience.
  • the above-described VR lens structure is applied to a display device, from the left side to the right side in FIG. 1 as the position of the pupil 4 of the viewer, the screen of the first lens 1, the second lens 2, and the display panel 3, respectively.
  • the focus point of the pupil 4 the center point of the first lens 1 (for example, the geometric center point) 1C
  • the center point of the second lens 2 for example, the geometric center point
  • the center point of the display panel 3 for example, geometry Center point
  • the aperture (e.g., diameter) of the second lens 2 is larger than the aperture of the first lens 1, so that the angle of incident light is significantly refracted, so that the size of the display panel 3 can be matched.
  • the material used for the first lens and the second lens may be an optical resin or glass, and a resin material may be used to reduce the structural weight.
  • the distance from the center point of the display panel 3 in the present embodiment to the center point of the Fresnel surface S3 of the second lens 2, that is, the object distance is smaller than the effective focal length EFL of the combined lens formed by the first lens 1 and the second lens 2.
  • each of the first lens 1 and the second lens 2 may have a circular shape.
  • the present disclosure is not limited thereto, and for example, the shape of each of the first lens 1 and the second lens 2 may be the same as that of the display panel 3.
  • each optical effective surface of the first lens and the second lens the thickness of the lens center, and between the first lens and the second lens, and between the first lens and the viewer pupil 4, and the second lens and display are given below. Parameters such as the spacing between the panels 3.
  • the effective focal length EFL of the combined lens formed by the first lens and the second lens is 36.1 mm; the distance between the first lens and the viewer pupil 4 is 11 mm, and the curvature of the first side S1 of the first lens 1 (for example, the intermediate portion)
  • the radius is: 99.935 mm, the radius of curvature of the second side S2 is -49.709 mm; the thickness of the first lens 1 is 8.160 mm; the refractive index of the first lens 1 is 1.4918; the Abbe coefficient of the first lens 1 (also referred to as The Abbe number is 57.44; the radius of curvature of the smooth surface S4 of the second lens 2 is 223.181 mm, and the radius of curvature of the Fresnel surface S3 (for example, contour) is -41.2 mm; the second lens 2 The thickness of the second lens 2 is 1.4918; the Abbe's coefficient of the second lens 2 is 57.44; the gap between the first lens 1 and the second lens 2 is
  • the inventors of the present disclosure simulated the performance using the optical design software Zemax provided by Zemax Corporation of the United States.
  • the simulation results show that the curvature of field (also called “field curvature”), speckle and distortion performance of the VR lens structure are shown in Figures 2A, 2B, 2C and 3, respectively.
  • the coordinate origins indicate the positions of the pupils 4 in FIGS. 1, 4, and 7, respectively, and the negative direction representation of the abscissa.
  • the positive direction of the abscissa indicates the right side of the pupil 4 shown in the drawing; further, the vertical axis (ie, the Y axis) indicates the one shown in FIGS. 1, 4, and 7.
  • the normalized size in the vertical direction so there is no size unit.
  • the field curvature curves of red (R), green (G), and blue (B) substantially overlap each other.
  • Fig. 2B shows field curvature curves of red (R), green (G), and blue (B) in a smaller abscissa range.
  • the field curvature curves of red (R), green (G), and blue (B) are slightly offset from each other.
  • the subscripts "S" and “T” respectively indicate two mutually perpendicular directions set in the Zemax software, that is, in FIGS. 2B, 5B, and 8B.
  • the field curvature curves R S , G S , and B S may correspond to the “mertz field curvature” in FIGS. 2A, 5A, and 8A, respectively, and the field curvature curves R T , G T in FIGS. 2B, 5B, and 8B, respectively .
  • B T may correspond to "sagittal field curvature" in FIGS.
  • 2C is a dot-column diagram of the diffuse plaque at the focal length position of the VR lens structure of the embodiment of FIG. 1 of the present disclosure.
  • the three numbers in the upper right corner of Figure 2C, from bottom to top, represent the wavelengths (in microns) of red (R), green (G), and blue (B) used in the simulation, respectively. It can be seen from the figure that the VR lens structure in this embodiment does not significantly increase the field curvature value at a large viewing angle, thereby ensuring better image quality.
  • the distortion value of the lens group gradually increases with the change of the angle of view, which has a smooth increase curve, which is beneficial to the anti-distortion correction by software method in the later stage, so as to avoid the problem that the display scene is deformed and the viewing comfort is affected.
  • the VR lens structure in this embodiment can achieve a single-eye 120° field of view range, and the total field of view of both eyes exceeds 135°, so that the visual immersion of the VR display device is greatly enhanced.
  • the power ⁇ 2 146.13 1 / m, that is, the Fresnel power set is greater than 0.8 times the aspheric power and less than twice the aspheric power.
  • the radius of curvature of each optical effective surface of the first lens 1 and the second lens 2, the thickness of the lens center, and between the first lens 1 and the second lens 2, and the first lens 1 and the viewer pupil 4, the spacing between the second lens 2 and the display panel 3 is not limited to the above values, and any value between ⁇ 0.1 mm on the basis of the above values may be selected, and the first lens 1 and the second
  • the refractive index of the material selected for the lens 2 can also be any value between the ranges of ⁇ 0.01 based on the above values.
  • Embodiments of the present disclosure provide another VR lens structure and another display device to which the VR lens structure is applied.
  • the VR lens structure includes the first lens 1 and the second lens 2 disposed opposite to each other, as shown in FIG.
  • the first lens 1 is an aspherical lens, that is, the first side surface S1 and the second side surface S2 of the first lens 1 are aspherical surfaces; wherein the first side surface S1 can be referred to as a first aspheric surface, and the second side surface S2 Call it the second aspherical surface.
  • the second lens 2 is a Fresnel lens, and the smooth surface S4 of the second lens 2 is a flat surface.
  • the VR lens structure in this embodiment is composed of two lenses, that is, the first lens 1 having two aspherical surfaces and the second lens 2 having the Fresnel lens
  • the VR lens structure has four optical effective faces, namely a first side S1, a second side S2 of the first lens 1, and a Fresnel surface S3 and a smooth surface S4 of the second lens; thus, the VR lens is designed
  • the parameters of the four optical effective faces can be set, so that the formed VR lens structure has a larger viewing angle when applied to the display device, and a better structure, thereby enhancing the user experience.
  • the smooth surface S4 of the Fresnel lens in this embodiment is a flat surface, which is convenient to prepare and has a simple structure.
  • the above-described VR lens structure is applied to a display device, and the position of the pupil 4 of the viewer, the first lens 1, the second lens 2, and the screen of the display panel 3 are respectively from the left side to the right side in FIG.
  • the focus point of the pupil 4 the center point of the first lens 1 (for example, the geometric center point) 1C
  • the center point of the second lens 2 for example, the geometric center point
  • the center point of the display panel 3 for example, geometry Center point
  • the aperture of the second lens 2 is larger than the aperture of the first lens 1, so that the angle of the incident light is significantly refracted, so that the size of the display panel 3 can be matched.
  • the material used for the first lens and the second lens is an optical resin or glass, and a resin material may be used to reduce the structural weight.
  • the distance from the center point of the display panel 3 in the present embodiment to the center point of the Fresnel surface S3 of the second lens 2, that is, the object distance is smaller than the effective focal length EFL of the combined lens formed by the first lens 1 and the second lens 2.
  • each optical effective surface of the first lens and the second lens the thickness of the lens center, and between the first lens and the second lens, and between the first lens and the viewer pupil 4, and the second lens and display are given below. Parameters such as the spacing between the panels 3.
  • the effective focal length EFL of the combined lens formed by the first lens and the second lens is 36.0 mm; the distance between the first lens and the viewer pupil 4 is 11 mm, and the curvature of the first side S1 of the first lens 1 (for example, the intermediate portion)
  • the radius is: 89.442 mm, the radius of curvature of the second side S2 is -59.286 mm; the thickness of the first lens 1 is 9.847 mm; the refractive index of the first lens 1 is 1.4918; the Abbe's coefficient of the first lens 1 is 57.44;
  • the radius of curvature of the smooth surface S4 of the two lens 2 is: 0 mm, the radius of curvature of the Fresnel surface S3 is -63.253 mm; the thickness of the second lens 2 is 2.0 mm; the refractive index of the second lens 2 is 1.4918; the second lens
  • the Abbe's coefficient of 2 is 57.44; the gap between the first lens 1 and the second lens
  • the simulation results of the field curvature and the distortion performance of the VR lens structure are respectively shown in FIG. 5A, FIG. 5B and FIG. 6 (the dot map of the diffuse plaque in this embodiment is shown in FIG. 2C).
  • the situation is similar and therefore not shown separately).
  • the VR lens structure in this embodiment does not significantly increase the field curvature value at a large viewing angle, thereby ensuring better image quality.
  • the distortion value of the lens group gradually increases with the change of the angle of view, which has a smooth increase curve, which is beneficial to the anti-distortion correction by software method in the later stage, so as to avoid the problem that the display scene is deformed and the viewing comfort is affected.
  • the VR lens structure shown in this embodiment can achieve a single-eye 115° field of view range, and the total field of view of both eyes exceeds 130°, so that the visual immersion of the VR display device is greatly enhanced.
  • the radius of curvature of each optical effective surface of the first lens 1 and the second lens 2, the thickness of the lens center, and between the first lens 1 and the second lens 2, and the first lens 1 and the viewer pupil 4, the spacing between the second lens 2 and the display panel 3 is not limited to the above values, and any value between ⁇ 0.1 mm on the basis of the above values may be selected, and the first lens 1 and the second
  • the refractive index of the material selected for the lens 2 can also be any value between the ranges of ⁇ 0.01 based on the above values.
  • Embodiments of the present disclosure provide another VR lens structure and another display device to which the VR lens structure is applied.
  • the VR lens structure includes the first lens 1 and the second lens 2 disposed opposite to each other, as shown in FIG.
  • the first lens 1 is an aspherical lens, that is, the first side surface S1 and the second side surface S2 of the first lens 1 are aspherical surfaces; wherein the first side surface S1 can be referred to as a first aspheric surface, and the second side surface S2 Call it the second aspherical surface.
  • the first aspherical surface protrudes away from the second aspherical surface; the second aspherical surface protrudes away from the first aspherical surface.
  • the second lens 2 is a Fresnel lens, and the smooth surface S4 of the second lens 2 is a flat surface.
  • the VR lens structure in this embodiment is composed of two lenses, that is, the first lens 1 having two aspherical surfaces and the second lens 2 having the Fresnel lens
  • the VR lens structure has four optical effective faces, namely a first side S1, a second side S2 of the first lens 1, and a Fresnel surface S3 and a smooth surface S4 of the second lens 2; thus, the VR is designed
  • the parameters of the four optical effective surfaces can be set, so that the formed VR lens structure has a larger viewing angle when applied to the display device, and a better structure, enhancing the user experience.
  • the above-described VR lens structure is applied to a display device, from the left side to the right side in FIG. 7 as the position of the pupil 4 of the viewer, the screen of the first lens 1, the second lens 2, and the display panel 3, respectively.
  • the focus point of the pupil 4 the center point of the first lens 1 (for example, the geometric center point) 1C
  • the center point of the second lens 2 for example, the geometric center point
  • the center point of the display panel 3 for example, geometry Center point
  • the aperture of the second lens 2 is larger than the aperture of the first lens 1, so that the angle of the incident light is significantly refracted, so that the size of the display panel 3 can be matched.
  • the material used for the first lens and the second lens is an optical resin or glass, and a resin material may be used to reduce the structural weight.
  • the material used for the first lens has a higher refractive index, between 1.55 and 1.70.
  • the distance from the center point of the display panel 3 in the present embodiment to the center point of the Fresnel surface S3 of the second lens 2 is smaller than the effective focal length of the combined lens formed by the first lens 1 and the second lens 2. EFL.
  • each optical effective surface of the first lens and the second lens the thickness of the lens center, and between the first lens and the second lens, and between the first lens and the viewer pupil 4, and the second lens and display are given below. Parameters such as the spacing between the panels 3.
  • the effective focal length EFL of the combined lens formed by the first lens and the second lens is 35.37 mm; the distance between the first lens and the viewer pupil 4 is 11 mm, and the radius of curvature of the first side surface S1 of the first lens 1 is 72.002 mm, The radius of curvature of the two side faces S2 is -283.789 mm; the thickness of the first lens 1 is 6.729 mm; the refractive index of the first lens 1 is 1.68879; the Abbe's coefficient of the first lens 1 is 52.868; the smooth surface S4 of the second lens 2
  • the radius of curvature is: 0 mm, the radius of curvature of the Fresnel surface S3 is -58.943 mm; the thickness of the second lens 2 is 2.0 mm; the refractive index of the second lens 2 is 1.4918; the Abbe's coefficient of the second lens 2 is 57.44
  • the gap between the first lens 1 and the second lens 2 is 0.5 mm; the distance from the
  • the simulation results of the curvature of field and the distortion performance of the VR lens structure are as shown in FIG. 8A, FIG. 8B and FIG. 9 respectively (the dot map of the speckle of the present embodiment is shown in FIG. 2C).
  • the first lens is made of a high refractive index material.
  • the refractive index n of the material may be 1.68879, so that the first lens may have a thinner thickness.
  • the thickness and weight of the VR lens structure are alleviated, and the application advantage is good.
  • the VR lens structure in this embodiment does not significantly increase the field curvature value at a large viewing angle, ensuring good imaging quality.
  • the distortion value of the lens group gradually increases with the change of the angle of view, which has a smooth increase curve, which is beneficial to the anti-distortion correction by software method in the later stage, so as to avoid the problem that the display scene is deformed and the viewing comfort is affected.
  • the VR lens structure in this embodiment can realize a single-eye 118° field of view range, and the total field of view of both eyes reaches 130°, so that the visual immersion of the VR display device is greatly enhanced.
  • the radius of curvature of each optical effective surface of the first lens 1 and the second lens 2, the thickness of the lens center, and between the first lens 1 and the second lens 2, and the first lens 1 and the viewer pupil 4, the spacing between the second lens 2 and the display panel 3 is not limited to the above values, and any value between ⁇ 0.1 mm on the basis of the above values may be selected, and the first lens 1 and the second
  • the refractive index of the material selected for the lens 2 can also be any value between the ranges of ⁇ 0.01 based on the above values.
  • the VR lens structure according to any of the above-described embodiments of the present disclosure has at least the following advantageous technical effects. Since the VR lens structure in the present disclosure is composed of two lenses, namely a first lens and a second lens, the VR lens structure is applied to a display device having four optical effective faces, ie, first a first side surface, a second side surface of the lens, and a Fresnel surface and a light surface of the second lens; thus, when designing the VR lens structure, parameters of the four optical effective surfaces can be set to The formed VR lens structure has a larger viewing angle and a better structure when applied to a display device, enhancing the user experience.
  • Embodiments of the present disclosure provide a display device.
  • the display device includes a display panel 3 and a VR lens structure as shown in FIG. 1, FIG. 4 or FIG. 7 on the light-emitting surface side of the display panel 3.
  • the Fresnel surface S3 of the second lens 2 is disposed closer to the display panel 3 than the smooth surface S4.
  • the display device has a large viewing angle and a small size, and has an improved immersion feeling.
  • reference numeral "4" denotes a through hole, but in the VR lens structure
  • the position of the reference numeral "4" may be provided with a light source, and the position viewed by the user may be located on the right side of the display panel 3. Therefore, as described above, the distance between the light source and the first lens 1 can be 11 mm.

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Abstract

本公开提供一种VR透镜结构及一种显示装置。所述VR透镜结构包括：相对设置的第一透镜和第二透镜。第一透镜具有相对设置的第一侧面和第二侧面，且第一侧面和第二侧面中的至少一者为非球面。第二透镜为菲涅尔透镜，且第二透镜的光面与第二侧面靠近设置，所述第二透镜的菲涅尔面较光面远离第二侧面设置。

Description

VR透镜结构及显示装置
相关申请的交叉引用
本申请要求于2018年4月12日提交的中国专利申请No.201810326480.9的优先权，该专利申请的全部内容通过引用方式合并于此。
技术领域
本公开属于显示技术领域，具体涉及一种VR透镜结构及显示装置。
背景技术
在VR显示设备中，为了获得更好的视觉体验，一种设计方法是增大可视视场，以增加沉浸感。
发明内容
本公开的实施例提供一种VR透镜结构及一种显示装置。
本公开的一方面提供了一种VR透镜结构，该VR透镜结构包括：相对设置的第一透镜和第二透镜；其中，
所述第一透镜具有相对设置的第一侧面和第二侧面，且所述第一侧面和所述第二侧面中的至少一者为非球面；以及
所述第二透镜为菲涅尔透镜，且所述第二透镜的光面与所述第二侧面靠近设置，所述第二透镜的菲涅尔面较所述光面远离所述第二侧面设置。
在一个实施例中，所述第一透镜的第一侧面和第二侧面均为非球面；
所述第一侧面的中间区域朝向远离所述第二侧面的方向凸出，边缘区域朝向靠近所述第二侧面的方向凸出；以及
所述第二侧面朝向远离所述第一侧面的方向凸出。
在一个实施例中，所述第一透镜的第一侧面和第二侧面均为非球面；
所述第一侧面朝向远离所述第二侧面的方向凸出；以及
所述第二侧面朝向远离所述第一侧面的方向凸出。
在一个实施例中，所述第二透镜的光面包括平面或者非球面。
在一个实施例中，所述第二透镜的光面为非球面，且朝向远离所述菲涅尔面的方向凸出。
在一个实施例中，所述第一透镜的折射率为1.55至1.70。
在一个实施例中，所述第二透镜的菲涅尔面上的任意两个相邻螺纹之间的间距为0.2mm-0.7mm。
在一个实施例中，所述菲涅尔面上的螺纹深度不同，且所述螺纹深度越深所述螺纹的脱模角越大。
在一个实施例中，所述第一透镜的光焦度为Ф1，所述第二透镜的光焦度为Ф2，且二者满足以下公式：
0.8Ф1≤Ф2≤2Ф1。
在一个实施例中，所述第一透镜的口径小于所述第二透镜的口径。
在一个实施例中，所述第一透镜的第一侧面的中间区域的曲率半径为：99.935mm±0.1mm，第二侧面的曲率半径为-49.709mm±0.1mm；所述第一透镜的厚度为8.160mm±0.1mm；所述第一透镜的折射率为1.4918±0.01；以及
所述第二透镜的光面的曲率半径为：223.181mm±0.1mm，菲涅尔面的曲率半径为-41.2mm±0.1mm；所述第二透镜的厚度为4.769mm；所述第二透镜的折射率为1.4918±0.01。
应当理解的是，本公开中的第一数值“±”第二数值包括：在第一数值“+”第二数值所得到的数值和第一数值“-”第二数值所得到的数值之间的任意数值(包括两个端点的数值之一)。
在一个实施例中，所述第一透镜的第一侧面的中间区域的曲率半径为：89.442mm±0.1mm，第二侧面的曲率半径为-59.286mm ±0.1mm；所述第一透镜的厚度为9.847mm±0.1mm；所述第一透镜的折射率为1.4918±0.01；以及
所述第二透镜的光面的曲率半径为：0mm±0.1mm，菲涅尔面的曲率半径为-63.253mm±0.1mm；所述第二透镜的厚度为2.0mm±0.1mm；所述第二透镜的折射率为1.4918±0.01。
在一个实施例中，所述第一透镜的第一侧面的曲率半径为：72.002mm±0.1mm，第二侧面的曲率半径为-283.789mm±0.1mm；所述第一透镜的厚度为6.729mm±0.1mm；所述第一透镜的折射率为1.68879±0.01；以及
所述第二透镜的光面的曲率半径为：0mm±0.1mm，菲涅尔面的曲率半径为-58.943mm±0.1mm；所述第二透镜的厚度为2.0mm±0.1mm；所述第二透镜的折射率为1.4918±0.01。
本公开的另一方面提供了一种显示装置，该显示装置包括：
显示面板；以及
位于所述显示面板的出光面侧的、根据本公开的上述实施例中的任意一个的VR透镜结构；
其中，所述第二透镜的菲涅尔面较光面靠近所述显示面板设置。
在一个实施例中，所述第一透镜、所述第二透镜、所述显示面板三者的中心点在同一条直线上；且所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离小于所述VR透镜结构的有效焦距。
在一个实施例中，所述第一透镜的第一侧面的中间区域的曲率半径为：99.935mm±0.1mm，第二侧面的曲率半径为-49.709mm±0.1mm；所述第一透镜的厚度为8.160mm±0.1mm；所述第一透镜的折射率为1.4918±0.01；
所述第二透镜的光面的曲率半径为：223.181mm±0.1mm，菲涅尔面的曲率半径为-41.2mm±0.1mm；所述第二透镜的厚度为4.769mm±0.1mm；所述第二透镜的折射率为1.4918±0.01；以及
所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点 之间的距离为32.945mm±0.1mm。
在一个实施例中，所述第一透镜的第一侧面的中间区域的曲率半径为：89.442mm±0.1mm，第二侧面的曲率半径为-59.286mm±0.1mm；所述第一透镜的厚度为9.847mm±0.1mm；所述第一透镜的折射率为1.4918±0.01；
所述第二透镜的光面的曲率半径为：0mm±0.1mm，菲涅尔面的曲率半径为-63.253mm±0.1mm；所述第二透镜的厚度为2.0mm±0.1mm；所述第二透镜的折射率为1.4918±0.01；以及
所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离为30.185mm±0.1mm。
在一个实施例中，所述第一透镜的第一侧面的曲率半径为：72.002mm±0.1mm，第二侧面的曲率半径为-283.789mm±0.1mm；所述第一透镜的厚度为6.729mm±0.1mm；所述第一透镜的折射率为1.68879±0.01；
所述第二透镜的光面的曲率半径为：0mm±0.1mm，菲涅尔面的曲率半径为-58.943mm±0.1mm；所述第二透镜的厚度为2.0mm±0.1mm；所述第二透镜的折射率为1.4918±0.01；以及
所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离为33.021mm±0.1mm。
附图说明
图1为本公开的实施例的VR透镜结构及显示装置的示意图；
图2A和图2B为本公开的图1所示的实施例的VR透镜结构的场曲曲线示意图；
图2C为本公开的图1所示的实施例的VR透镜结构在其焦距位置上的弥散斑的点列图；
图3为本公开的图1所示的实施例的VR透镜结构的畸变量曲线示意图；
图4为本公开的实施例的另一种VR透镜结构及另一种显示装置的示意图；
图5A和图5B为本公开的图4所示的实施例的VR透镜结构的场曲曲线示意图；
图6为本公开的图4所示的实施例的VR透镜结构的畸变量曲线示意图；
图7为本公开的实施例的另一种VR透镜结构及另一种显示装置的示意图；
图8A和图8B为本公开的图7所示的实施例的VR透镜结构的场曲曲线示意图；以及
图9为本公开的图7所示的实施例的VR透镜结构的畸变量曲线示意图。
具体实施方式
为使本领域技术人员更好地理解本公开的技术方案，下面结合附图和具体实施方式对本公开作进一步详细描述。
如上所述，在VR(Virtual Reality)显示设备中，为了获得更好的视觉体验，一种设计方法是增大可视视场，以增加沉浸感。然而，本公开的发明人发现，采用单透镜的传统VR透镜由于受目距的限制而所提供的视场角偏小。即使忽略人机交互，强行减小目距来增大视角，也存在单透镜像差和畸变严重的问题，影响体验效果。因此单透镜VR光路结构受限于透镜曲率及厚度的影响，难以达到双眼综合视场超过120°的效果的要求。
为了提升VR透镜的视角和成像质量，并控制VR透镜的光路系统的长度，采用多透镜的VR透镜结构被提出并开始应用。通过匹配屏幕的参数，找到采用多透镜的合适VR透镜结构是提升VR透镜结构的显示效果的一个方向。
本公开的实施例提供一种VR透镜结构，包括：相对设置的第一透镜和第二透镜；其中，第一透镜具有相对设置的第一侧面和第二侧面，且第一侧面和第二侧面中的至少一者为非球面；第二透镜为菲涅尔透镜，其具有相对设置的菲涅尔面和光面，且该第二透镜的光面与第一透镜的第二侧面靠近设置，该第二透镜的 菲涅尔面较光面远离所述第二侧面设置。应当理解的是，所述第二透镜的所述菲涅尔面是设置有螺纹(或同心圆)的表面，即，实质上使光线的传播方向改变的表面。所述第二透镜的所述光面是与所述菲涅尔面相对的表面。
由于本实施例中的VR透镜结构由两个透镜构成，也即第一透镜和第二透镜，因此将该VR透镜结构应用至显示装置中，该VR透镜结构具有四个光学有效面，即第一透镜的第一侧面、第二侧面，以及第二透镜的菲涅尔面和光面；这样一来，在设计该VR透镜结构时，可以对这四个光学有效面的参数进行设置，以使所形成的VR透镜结构在应用至显示装置时，具有较大的视角，以及更优的结构，增强用户体验。
例如，在本实施例中将第二透镜的菲涅尔面的上的任意两个相邻螺纹之间的间距设为0.2mm-0.7mm，且螺纹深度不同，且所述螺纹深度越深螺纹的脱模角越大，也即每个螺纹的脱模角不同，渐变性分布，这样一来可以减小脱模难度。
此外，在本实施例中将VR透镜结构的第一透镜的光焦度设置为Ф1，第二透镜的光焦度设置为Ф2，且二者满足以下公式：0.8Ф1≤Ф2≤2Ф1；该种设置方式不仅能够使得应用该VR透镜结构的虚拟显示设备的单眼可视角度FOV大于115°，双眼FOV达到130°，从而实现更大的视场范围，增加显示沉浸感。而且相比单透镜的装置可提供更大的虚拟现实装置的视场角度，同时可减少整体设备，特别是屏幕的尺寸大小，得到结构紧凑的VR显示装置。
具体结合下述实施例，对本实施例中的VR透镜结构，以及应用该VR透镜结构的显示装置的结构和效果进行进一步的说明。
本公开的实施例提供一种VR透镜结构和一种应用该VR透镜结构的显示装置。其中，VR透镜结构包括相对设置的第一透镜1和第二透镜2，如图1所示。第一透镜1为非球面透镜，也即第一透镜1的第一侧面S1和第二侧面S2均为非球面。其中，可将第一侧面S1称之为第一非球面，第二侧面S2称之为第二非球面。 且第一非球面的中间区域朝向远离第二非球面的方向凸出，边缘区域朝向靠近第二非球面的方向凸出。第二非球面朝向远离第一非球面的方向凸出。第二透镜2为菲涅尔透镜，且第二透镜2的光面S4为非球面，且朝向远离菲涅尔面S3的方向凸出。
由于本实施例中的VR透镜结构由两个透镜构成，即具有两个非球面的第一透镜1和应用菲涅尔透镜的第二透镜2，且菲涅尔透镜的光面也为非球面，也就是说，在本实施例中第一透镜1和第二透镜2均为非球面透镜，这样一来，有利于控制光的折射方向以实现大视角，增强用户体验。
作为示例，将上述的VR透镜结构应用至显示装置中，从图1中的左侧至右侧分别为观看者的瞳孔4位置、第一透镜1、第二透镜2、显示面板3的屏幕。其中，瞳孔4的聚焦点、第一透镜1的中心点(例如，几何中心点)1C、第二透镜2的中心点(例如，几何中心点)2C、显示面板3的中心点(例如，几何中心点)3C应该在同一直线上。第二透镜2的口径(例如，直径)大于第一透镜1的口径，这样一来对入射光线角度起到明显的折射作用，从而可以匹配显示面板3的尺寸。例如，第一透镜和第二透镜所采用的材料可为光学树脂或玻璃，为减轻结构重量，可采用树脂材料。本实施例中的显示面板3的中心点到第二透镜2的菲涅尔面S3中心点的距离，即物距小于第一透镜1和第二透镜2所形成的组合透镜的有效焦距EFL。在一个示例中，第一透镜1和第二透镜2中的每一个可具有圆形形状。然而，本公开不限于此，例如，第一透镜1和第二透镜2中的每一个的形状可与显示面板3的形状相同。
以下给出第一透镜和第二透镜的各光学有效面的曲率半径、透镜中心厚度以及第一透镜与第二透镜之间，以及第一透镜与观看者瞳孔4之间、第二透镜与显示面板3之间的间距等参数。
第一透镜和第二透镜所形成的组合透镜的有效焦距EFL为36.1mm；第一透镜与观看者瞳孔4的间距11mm，第一透镜1的第一侧面S1的(例如，中间区域的)曲率半径为：99.935mm， 第二侧面S2的曲率半径为-49.709mm；第一透镜1的厚度为8.160mm；第一透镜1的折射率为1.4918；第一透镜1的阿贝系数(也称为阿贝数(Abbe number))为57.44；第二透镜2的光面S4的曲率半径为：223.181mm，菲涅尔面S3的(例如，轮廓的)曲率半径为-41.2mm；第二透镜2的厚度为4.769mm；第二透镜2的折射率为1.4918；第二透镜2的阿贝系数为57.44；第一透镜1和第二透镜2之间的间隙为0.5mm；显示面板3的中心点到第二透镜2的菲涅尔面S3的中心点之间的距离为32.945mm。
为了验证按照上述参数设置的VR透镜结构的性能，本公开的发明人利用美国Zemax公司提供的光学设计软件Zemax来模拟其性能。模拟结果显示，该VR透镜结构的场曲(也称为“像场弯曲”)、弥散斑和畸变性能分别如图2A、图2B、图2C和图3所示。应当理解的是，在图2A、图2B、图5A、图5B、图8A和图8B中，坐标原点分别表示图1、图4和图7中瞳孔4的位置，横坐标的负方向表示图中所示的瞳孔4的左侧，横坐标的正方向表示图中所示的瞳孔4的右侧；此外，纵轴(即，Y轴)表示图1、图4和图7中所示的竖直方向上归一化后的尺寸，因此没有尺寸单位。在图2A所示的横坐标范围内，红光(R)、绿光(G)和蓝光(B)的场曲曲线实质上互相重叠。图2B示出了红光(R)、绿光(G)和蓝光(B)在更小的横坐标范围内的场曲曲线。在图2B所示的横坐标范围内，红光(R)、绿光(G)和蓝光(B)的场曲曲线彼此轻微地偏移。在图2B(以及图5B和图8B)中，下标“S”和“T”分别表示Zemax软件中所设定的互相垂直的两个方向，即，图2B、图5B和图8B中的场曲曲线R S、G S和B S可分别对应于图2A、图5A和图8A中的“子午场曲”，而图2B、图5B和图8B中的场曲曲线R T、G T和B T可分别对应于图2A、图5A和图8A中的“弧矢场曲”。图2C为本公开的图1所示的实施例的VR透镜结构在其焦距位置上的弥散斑的点列图。图2C的右上角的三个数从下到上可分别表示模拟中所使用的红光(R)、绿光(G)和蓝光(B)的波长(以微米为单位)。从图中可以看 出，本实施例中的VR透镜结构在大视角时场曲值并未明显增加，保证了较好的成像质量。同时透镜组的畸变值随视场角的变化逐渐增加，具有平滑的增加曲线，有利于后期通过软件方法进行反畸变修正，从而避免出现显示场景发生变形而影响观看舒适性的问题。本实施例中的VR透镜结构可实现单眼120°视场范围，双眼总视场超过135°，使得VR显示设备的视觉沉浸感得到大大增强。本实施例中第一透镜1(非球面透镜)的光焦度Ф 1＝146.11 1/m(单位1/m也可以表示为m -1)，第二透镜2(菲涅尔透镜)的光焦度Ф 2＝146.13 1/m，即符合所设定的菲涅尔光焦度大于非球面光焦度的0.8倍，小于非球面光焦度的2倍的要求。通过上述设定，可保证VR透镜结构的整体厚度小及成像质量好。
例如，在本实施例中第一透镜1和第二透镜2的各光学有效面的曲率半径、透镜中心厚度以及第一透镜1与第二透镜2之间，以及第一透镜1与观看者瞳孔4之间、第二透镜2与显示面板3之间的间距不局限于上述数值，也可以选用在上述数值的基础上±0.1mm所在范围之间的任意数值，而第一透镜1和第二透镜2所选用的材料的折射率，也可以选用在上述数值的基础上±0.01所在范围之间的任意数值。
本公开的实施例提供另一种VR透镜结构和另一种应用该VR透镜结构的显示装置。其中，VR透镜结构包括相对设置的第一透镜1和第二透镜2，如图4所示。第一透镜1为非球面透镜，也即第一透镜1的第一侧面S1和第二侧面S2均为非球面；其中，可将第一侧面S1称之为第一非球面，第二侧面S2称之为第二非球面。且第一非球面的中间区域朝向远离第二非球面的方向凸出，边缘区域朝向靠近第二非球面的方向凸出；第二非球面朝向远离第一非球面的方向凸出。第二透镜2为菲涅尔透镜，且第二透镜2的光面S4为平面。
由于本实施例中的VR透镜结构由两个透镜构成，即具有两个非球面的第一透镜1和应用菲涅尔透镜的第二透镜2，因此将该VR透镜结构应用至显示装置中，该VR透镜结构具有四个光学有 效面，即第一透镜1的第一侧面S1、第二侧面S2，以及第二透镜的菲涅尔面S3和光面S4；这样一来，在设计该VR透镜结构时，可以对这四个光学有效面的参数进行设置，以使所形成的VR透镜结构在应用至显示装置时，具有较大的视角，以及更优的结构，增强用户体验。此外，与图1所示的VR透镜结构不同的是，本实施例中的菲涅尔透镜的光面S4为平面，方便制备，结构简单。
作为示例，将上述的VR透镜结构应用至显示装置中，从图4中的左侧至右侧分别为观看者的瞳孔4位置、第一透镜1、第二透镜2、显示面板3的屏幕。其中，瞳孔4的聚焦点、第一透镜1的中心点(例如，几何中心点)1C、第二透镜2的中心点(例如，几何中心点)2C、显示面板3的中心点(例如，几何中心点)3C应该在同一直线上。第二透镜2的口径大于第一透镜1的口径，这样一来对入射光线角度起到明显的折射作用，从而可以匹配显示面板3的尺寸。第一透镜和第二透镜所采用的材料为光学树脂或玻璃，为减轻结构重量，可采用树脂材料。本实施例中的显示面板3的中心点到第二透镜2的菲涅尔面S3中心点的距离，即物距小于第一透镜1和第二透镜2所形成的组合透镜的有效焦距EFL。
以下给出第一透镜和第二透镜的各光学有效面的曲率半径、透镜中心厚度以及第一透镜与第二透镜之间，以及第一透镜与观看者瞳孔4之间、第二透镜与显示面板3之间的间距等参数。
第一透镜和第二透镜所形成的组合透镜的有效焦距EFL为36.0mm；第一透镜与观看者瞳孔4的间距11mm，第一透镜1的第一侧面S1的(例如，中间区域的)曲率半径为：89.442mm，第二侧面S2的曲率半径为-59.286mm；第一透镜1的厚度为9.847mm；第一透镜1的折射率为1.4918；第一透镜1的阿贝系数为57.44；第二透镜2的光面S4的曲率半径为：0mm，菲涅尔面S3的曲率半径为-63.253mm；第二透镜2的厚度为2.0mm；第二透镜2的折射率为1.4918；第二透镜2的阿贝系数为57.44；第一透镜1和第二透镜2之间的间隙为0.5mm；显示面板3的中心点 到第二透镜2的菲涅尔面S3的中心点之间的距离为30.185mm。
按照上述参数设置的VR透镜结构，该VR透镜结构的场曲和畸变性能的模拟结果分别如图5A、图5B和图6所示(本实施例的弥散斑的点列图与图2C所示的情况相似，因此未单独示出)。从图中可以看出，本实施例中的VR透镜结构在大视角时场曲值并未明显增加，保证了较好的成像质量。同时透镜组的畸变值随视场角的变化逐渐增加，具有平滑的增加曲线，有利于后期通过软件方法进行反畸变修正，从而避免出现显示场景发生变形而影响观看舒适性的问题。本实施例所示的VR透镜结构可实现单眼115°视场范围，双眼总视场超过130°，使得VR显示设备的视觉沉浸感得到大大增强。
例如，在本实施例中第一透镜1和第二透镜2的各光学有效面的曲率半径、透镜中心厚度以及第一透镜1与第二透镜2之间，以及第一透镜1与观看者瞳孔4之间、第二透镜2与显示面板3之间的间距不局限于上述数值，也可以选用在上述数值的基础上±0.1mm所在范围之间的任意数值，而第一透镜1和第二透镜2所选用的材料的折射率，也可以选用在上述数值的基础上±0.01所在范围之间的任意数值。
本公开的实施例提供另一种VR透镜结构和另一种应用该VR透镜结构的显示装置。其中，VR透镜结构包括相对设置的第一透镜1和第二透镜2，如图7所示。第一透镜1为非球面透镜，也即第一透镜1的第一侧面S1和第二侧面S2均为非球面；其中，可将第一侧面S1称之为第一非球面，第二侧面S2称之为第二非球面。且第一非球面朝向远离第二非球面的方向凸出；第二非球面朝向远离第一非球面的方向凸出。第二透镜2为菲涅尔透镜，且第二透镜2的光面S4为平面。
由于本实施例中的VR透镜结构由两个透镜构成，即具有两个非球面的第一透镜1和应用菲涅尔透镜的第二透镜2，因此将该VR透镜结构应用至显示装置中，该VR透镜结构具有四个光学有效面，即第一透镜1的第一侧面S1、第二侧面S2，以及第二透镜 2的菲涅尔面S3和光面S4；这样一来，在设计该VR透镜结构时，可以对这四个光学有效面的参数进行设置，以使所形成的VR透镜结构在应用至显示装置时，具有较大的视角，以及更优的结构，增强用户体验。
作为示例，将上述的VR透镜结构应用至显示装置中，从图7中的左侧至右侧分别为观看者的瞳孔4位置、第一透镜1、第二透镜2、显示面板3的屏幕。其中，瞳孔4的聚焦点、第一透镜1的中心点(例如，几何中心点)1C、第二透镜2的中心点(例如，几何中心点)2C、显示面板3的中心点(例如，几何中心点)3C应该在同一直线上。第二透镜2的口径大于第一透镜1的口径，这样一来对入射光线角度起到明显的折射作用，从而可以匹配显示面板3的尺寸。第一透镜和第二透镜所采用的材料为光学树脂或玻璃，为减轻结构重量，可采用树脂材料。同时，第一透镜所用材料折射率较高，在1.55到1.70之间。本实施例中的显示面板3的中心点到第二透镜2的菲涅尔面S3中心点的距离(即，物距)小于第一透镜1和第二透镜2所形成的组合透镜的有效焦距EFL。
以下给出第一透镜和第二透镜的各光学有效面的曲率半径、透镜中心厚度以及第一透镜与第二透镜之间，以及第一透镜与观看者瞳孔4之间、第二透镜与显示面板3之间的间距等参数。
第一透镜和第二透镜所形成的组合透镜的有效焦距EFL为35.37mm；第一透镜与观看者瞳孔4的间距11mm，第一透镜1的第一侧面S1的曲率半径为：72.002mm，第二侧面S2的曲率半径为-283.789mm；第一透镜1的厚度为6.729mm；第一透镜1的折射率为1.68879；第一透镜1的阿贝系数为52.868；第二透镜2的光面S4的曲率半径为：0mm，菲涅尔面S3的曲率半径为-58.943mm；第二透镜2的厚度为2.0mm；第二透镜2的折射率为1.4918；第二透镜2的阿贝系数为57.44；第一透镜1和第二透镜2之间的间隙为0.5mm；显示面板3的中心点到第二透镜2的菲涅尔面S3的中心点之间的距离为33.021mm。
按照上述参数设置的VR透镜结构，该VR透镜结构的场曲 和畸变性能的模拟结果分别如图8A、图8B和图9所示(本实施例的弥散斑的点列图与图2C所示的情况相似，因此未单独示出)。该实施例中第一透镜采用高折射率材料，作为示例该种材料的折射率n可为1.68879，这样一来，第一透镜可以具有更薄的厚度。在保证镜头组性能的情况下，减轻了VR透镜结构的厚度和重量，具有很好的应用优势。本实施例中的VR透镜结构在大视角时场曲值并未明显增加，保证了较好的成像质量。同时透镜组的畸变值随视场角的变化逐渐增加，具有平滑的增加曲线，有利于后期通过软件方法进行反畸变修正，从而避免出现显示场景发生变形而影响观看舒适性的问题。本实施例中的VR透镜结构可实现单眼118°视场范围，双眼总视场达到130°，使得VR显示设备的视觉沉浸感得到大大增强。
例如，在本实施例中第一透镜1和第二透镜2的各光学有效面的曲率半径、透镜中心厚度以及第一透镜1与第二透镜2之间，以及第一透镜1与观看者瞳孔4之间、第二透镜2与显示面板3之间的间距不局限于上述数值，也可以选用在上述数值的基础上±0.1mm所在范围之间的任意数值，而第一透镜1和第二透镜2所选用的材料的折射率，也可以选用在上述数值的基础上±0.01所在范围之间的任意数值。
根据本公开的上述实施例中的任意一个的VR透镜结构至少具有如下的有益技术效果。由于本公开中的VR透镜结构由两个透镜构成，也即第一透镜和第二透镜，因此将该VR透镜结构应用至显示装置中，该VR透镜结构具有四个光学有效面，即第一透镜的第一侧面、第二侧面，以及第二透镜的菲涅尔面和光面；这样一来，在设计该VR透镜结构时，可以对这四个光学有效面的参数进行设置，以使所形成的VR透镜结构在应用至显示装置时，具有较大的视角，以及更优的结构，增强用户体验。
本公开的实施例提供了一种显示装置。该显示装置包括显示面板3和位于所述显示面板3的出光面侧的如图1、图4或图7所示的VR透镜结构。所述第二透镜2的菲涅尔面S3较光面S4 靠近所述显示面板3设置。
通过包括根据本公开的图1、图4或图7所示的实施例的VR透镜结构，所述显示装置具有较大的视角和较小的尺寸，并且具有改善的沉浸感。
应当理解的是，由于光路具有可逆性，因此虽然在图1、图4或图7所示的VR透镜结构和显示装置中，附图标记“4”表示通孔，但是在所述VR透镜结构和显示装置的产品中，附图标记“4”的位置可设置有光源，用户观看的位置可位于显示面板3的右侧。因此，如上文所述，光源与第一透镜1的间距可为11mm。
所述显示装置的其他方面及其细节可参见参照图1至图9的以上描述。
应当理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也属于本公开的保护范围。

Claims (18)

  1. 一种VR透镜结构，包括：相对设置的第一透镜和第二透镜；其中，
    所述第一透镜具有相对设置的第一侧面和第二侧面，且所述第一侧面和所述第二侧面中的至少一者为非球面；以及
    所述第二透镜为菲涅尔透镜，且所述第二透镜的光面与所述第二侧面靠近设置，所述第二透镜的菲涅尔面较所述光面远离所述第二侧面设置。
  2. 根据权利要求1所述的VR透镜结构，其中，所述第一透镜的第一侧面和第二侧面均为非球面；
    所述第一侧面的中间区域朝向远离所述第二侧面的方向凸出，边缘区域朝向靠近所述第二侧面的方向凸出；以及
    所述第二侧面朝向远离所述第一侧面的方向凸出。
  3. 根据权利要求1所述的VR透镜结构，其中，所述第一透镜的第一侧面和第二侧面均为非球面；
    所述第一侧面朝向远离所述第二侧面的方向凸出；以及
    所述第二侧面朝向远离所述第一侧面的方向凸出。
  4. 根据权利要求1所述的VR透镜结构，其中，所述第二透镜的光面包括平面或者非球面。
  5. 根据权利要求4所述的VR透镜结构，其中，所述第二透镜的光面为非球面，且朝向远离所述菲涅尔面的方向凸出。
  6. 根据权利要求1或3所述的VR透镜结构，其中，所述第一透镜的折射率为1.55至1.70。
  7. 根据权利要求1至6中任一项所述的VR透镜结构，其中，所述第二透镜的菲涅尔面上的任意两个相邻螺纹之间的间距为0.2mm-0.7mm。
  8. 根据权利要求1至7中任一项所述的VR透镜结构，其中，所述菲涅尔面上的螺纹深度不同，且所述螺纹深度越深所述螺纹的脱模角越大。
  9. 根据权利要求1至8中任一项所述的VR透镜结构，其中，所述第一透镜的光焦度为Φ1，所述第二透镜的光焦度为Φ2，且二者满足以下公式：
    0.8Φ1≤Φ2≤2Φ1。
  10. 根据权利要求1至9中任一项所述的VR透镜结构，其中，所述第一透镜的口径小于所述第二透镜的口径。
  11. 根据权利要求1、4-5和7-10中任一项所述的VR透镜结构，其中，所述第一透镜的第一侧面的中间区域的曲率半径为：99.935mm±0.1mm，第二侧面的曲率半径为-49.709mm±0.1mm；所述第一透镜的厚度为8.160mm±0.1mm；所述第一透镜的折射率为1.4918±0.01；以及
    所述第二透镜的光面的曲率半径为：223.181mm±0.1mm，菲涅尔面的曲率半径为-41.2mm±0.1mm；所述第二透镜的厚度为4.769mm；所述第二透镜的折射率为1.4918±0.01。
  12. 根据权利要求1、4和7-10中任一项所述的VR透镜结构，其中，所述第一透镜的第一侧面的中间区域的曲率半径为：89.442mm±0.1mm，第二侧面的曲率半径为-59.286mm±0.1mm；所述第一透镜的厚度为9.847mm±0.1mm；所述第一透镜的折射率为1.4918±0.01；以及
    所述第二透镜的光面的曲率半径为：0mm±0.1mm，菲涅尔面的曲率半径为-63.253mm±0.1mm；所述第二透镜的厚度为2.0mm±0.1mm；所述第二透镜的折射率为1.4918±0.01。
  13. 根据权利要求1、3-4和6-10中任一项所述的VR透镜结构，其中，所述第一透镜的第一侧面的曲率半径为：72.002mm±0.1mm，第二侧面的曲率半径为-283.789mm±0.1mm；所述第一透镜的厚度为6.729mm±0.1mm；所述第一透镜的折射率为1.68879±0.01；以及
    所述第二透镜的光面的曲率半径为：0mm±0.1mm，菲涅尔面的曲率半径为-58.943mm±0.1mm；所述第二透镜的厚度为2.0mm±0.1mm；所述第二透镜的折射率为1.4918±0.01。
  14. 一种显示装置，包括：
    显示面板；以及
    位于所述显示面板的出光面侧的、根据权利要求1至13中任一项所述的VR透镜结构；
    其中，所述第二透镜的菲涅尔面较光面靠近所述显示面板设置。
  15. 根据权利要求14所述的显示装置，其中，所述第一透镜、所述第二透镜、所述显示面板三者的中心点在同一条直线上；且所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离小于所述VR透镜结构的有效焦距。
  16. 根据权利要求14所述的显示装置，其中，所述VR透镜结构为根据权利要求11所述的VR透镜结构；以及
    所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离为32.945mm±0.1mm。
  17. 根据权利要求14所述的显示装置，其中，所述VR透镜结构为根据权利要求12所述的VR透镜结构；以及
    所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离为30.185mm±0.1mm。
  18. 根据权利要求14所述的显示装置，其中，所述VR透镜结构为根据权利要求13所述的VR透镜结构；以及
    所述显示面板的中心点到所述第二透镜的菲涅尔面的中心点之间的距离为33.021mm±0.1mm。
PCT/CN2019/082053 2018-04-12 2019-04-10 Vr透镜结构及显示装置 WO2019196865A1 (zh)

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