CN218413061U

CN218413061U - VR lens for eliminating screen window effect

Info

Publication number: CN218413061U
Application number: CN202221833707.7U
Authority: CN
Inventors: 邓云天
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2023-01-31
Anticipated expiration: 2032-07-18

Abstract

The utility model discloses a screen window effect VR lens disappears, simple structure is compact, through the radius of curvature that reduces lens, increase hunch height and make the mould easily process, and is with low costs, is fit for various OLED, LCD screen and subducts the screen window effect. The VR lens with the screen window eliminating effect is formed by combining a cylindrical lens grating phase plate (1) and a VR lens (2), the VR lens (2) can be a plano-convex lens, a Fresnel lens or a Pancut folding optical module, the plane end of the VR lens (2) is bonded with the cylindrical lens grating phase plate (1) through transparent UV glue (4), the cylindrical lens grating phase plate (1) is formed by orthogonally overlapping two layers of cylindrical lens gratings (5), the convex surfaces of the cylindrical lens gratings (5) are opposite, the middle of the cylindrical lens grating phase plate is filled and bonded through low-refractive-index UV glue (6), the expansion degrees of a sub-pixel light emitting surface (8) in the X direction and the Y direction can be respectively designed, and the resolution of a display screen is kept not to be reduced when the screen window effect is eliminated. The VR lens with the screen window effect eliminating function is high in light transmittance, the screen window effect eliminating function is remarkable, and the VR lens can be used in cooperation with a mobile phone screen to serve as a low-cost VR display scheme, so that the VR display effect with high color gamut, high brightness and HDR is achieved.

Description

VR lens for eliminating screen window effect

The technical field is as follows:

the utility model relates to a VR shows lens, more specifically says, relates to a VR lens that can subdue screen window effect, VR lens can be applied to VR glasses, VR all-in-one, the folding light path of Pancake etc..

Background art:

the screen effect of the VR display affects the experience of the user's immersion, which is always a problem to be overcome. The screen window effect is the result of "low fill factor", that is to say, the proportion that the luminous area of pixel occupies in pixel unit area is less, and the display screen resolution ratio is lower, and when near-to-eye enlargies and shows, the human eye can directly see the pixel structure of display screen, makes the image that shows become unreal, and is just as seeing something after the screen window, and the VR equipment that most LCD, OLED show all has this kind of problem at present. The resolution of the display screen is greatly improved to reach the retina definition, and the screen window effect can be eliminated, which can be realized only after the pixel density of the display panel and the calculation capacity of the processor are further improved. It is economical to add an optical diffuser or phase plate between the display and the lens, lens and eye to diffuse the light to the non-illuminated portion of the display to reduce the screen effect.

Patent application CN201710445828 adopts an astigmatism method of adding an astigmatism film between a lens and a human eye, or attaching a cylindrical or spherical grating with a pixel scale to the surface of a display screen, and the light diffusion method is characterized in that the diffusion area of a light emitting part of a pixel cannot be accurately controlled, no clear boundary exists, the light diffusion method usually has an astigmatism effect only when being expanded to the scale of a plurality of pixels, and the image definition is also reduced while the screen window effect is reduced. Patent application CN 201610939825 uses spatial filtering to eliminate the high frequency of the display screen to achieve the effect of reducing the screen window effect, and besides the disadvantage of loose structure, the spatial filtering method suppresses the detail of the sub-pixel structure and the high frequency of the image together, resulting in the decrease of the definition. Patent application KR20160053568 places a light diffusion member on the display panel to diffuse light emitted from the light-transmitting area of the display panel to the light-shielding area, thereby improving the imaging quality of the display screen.

PCT/US2017/044958 adds a phase optics device behind the VR lens, as shown in fig. 1, to confuse the focus of the human eye on the pixel points on the screen for the purpose of making the pixel points invisible to the user, the phase optics device includes a microlens array with 0.6mm pitch between the microlenses, wherein each microlens has a radius of curvature of 85mm, as shown in fig. 2, the material is polymethyl methacrylate or polycarbonate material with good transparency, and may include an anti-reflection coating. The optical device adds proper phase refraction, the pixel points are blurred in a small range through the balanced micro-lens array, the RGB pixel resolution on the VR head is matched, and under the condition, the angular resolution is reduced, so that discontinuity between pixels can be achieved, namely the reduction of the resolution can only occur on one pixel, and the next pixel is not influenced. The phase optical device has no pixel alignment requirement, can reduce the screen window effect without reducing the image definition, has more realistic image, is a screen window effect eliminating device which can be widely applied, and is an effective solution for the medium-low resolution OLED head disappearing screen window. The phase optical device has the disadvantages that firstly, the number of micro lenses forming the lens array is large, 4000 micro lenses are arranged on the area of 40mm and 40mm, and the processing cost of a mould is high; secondly, the micro-lens with the distance of 0.6mm x 0.6mm and the curvature radius R =85mm has the spherical surface arch height of only 0.5um, which has extremely high requirements on processing precision and smoothness, the quality of the die is difficult to ensure, and the light diffusion area is difficult to control by adjusting the focal length f of the micro-lens; thirdly, the diffusion degree of the phase optical device composed of the micro-lens array in the XY direction is the same, the diffusion distance in each direction cannot be designed according to requirements, the effect is better when the phase optical device is applied to the OLED screen arranged on the diamond, and the definition of the LCD screen arranged on the pixels in the standard RGB mode has certain influence.

The invention content is as follows:

the utility model discloses a structure of a VR lens for eliminating screen window effect, aiming at providing a simple and compact VR lens which can respectively adjust the light diffusion distance in X and Y directions and is suitable for eliminating screen window effect of various OLED and LCD screens; the second purpose is to reduce the curvature radius and increase the arch height, so that the die is easy to process and the die processing cost is reduced.

The phase optical device formed by the cylindrical lens array is referred to as a cylindrical grating phase plate (1) in the following description, so as to be different from the phase optical device formed by the micro lens array, the window effect eliminating VR lens is formed by combining the cylindrical grating phase plate (1) and the VR lens (2), one end face of the VR lens (2) is a plane, the VR lens (2) can be a plano-convex lens, a Fresnel lens or a Pancut folding optical module, and the plane end of the VR lens (2) is bonded with the cylindrical grating phase plate (1) through a transparent UV adhesive (4), as shown in FIG. 3.

Under the condition that the focal length of the VR lens (2) and the distance between the VR lens (2) and the display screen (3) are determined, when the display screen is observed from human eyes, the expansion degree of the luminous area of a pixel point of the display screen is negatively related to the focal length f of a micro lens or a cylindrical mirror on the phase optical plate, the larger the focal length f is, the smaller the expansion degree is, the size of the focal length f of the phase optical device is adjusted, the luminous area (8) of the sub-pixel can be expanded to be just within the area occupied by one sub-pixel, and the non-luminous area (7) of the sub-pixel is filled. Certainly, in view of different wavelengths of light emission of the RGB sub-pixels, corresponding focal lengths are different, the sub-pixel light emitting surface expansion area (9) is difficult to completely fill the sub-pixel non-light emitting area (7), the sub-pixel light emitting surface expansion area (9) is controlled within the area occupied by a complete pixel, expansion and overlapping between adjacent RGB sub-pixels are allowed, image definition is not reduced, and color fusion and screen elimination effects are facilitated. The size of the luminous surface expansion area (9) of the sub-pixel is adjusted, parameters with the best effect of eliminating the screen window effect can be obtained through repeated observation and comparison, and the reduction of the processing difficulty and the cost of the phase optical plate mold in the test process is very important.

Cylindrical lens grating phase board (1) form by two-layer cylindrical lens grating (5) quadrature coincide, the convex surface of cylindrical lens grating (5) is relative, and the centre is filled and is glued with low refracting index UV glue (6), as shown in figure 4. The low-refractive-index UV glue (6) fills and levels up the convex surface of the lenticular lens grating, so that the relative refractive index n of the lenticular lens grating (5) can be reduced, the curvature radius R of the cylindrical lens is further reduced, and the harsh requirement of a mold on the processing precision is reduced. The orthogonal superposition means that the grating lines of the two layers of lenticular gratings (5) are mutually vertically superposed together, which is an optimal design rather than a necessary condition, and the aim of the text can be achieved by non-vertical angle superposition.

Different from the surface magnification function of micro-lens imaging, the cylindrical lens imaging has the line magnification function, so that the two layers of lenticular gratings (5) can be designed into different focal lengths f to respectively control the expansion degrees of the luminous surface expansion areas (9) of the sub-pixels in the X and Y directions. The OLED screen with diamond arrangement has good screen eliminating effect because the extension degree of the luminous surface (8) of the sub-pixel in the X and Y directions is the same, as shown in figure 5; in a standard RGB LCD panel, the light emitting surface (8) of the sub-pixels need to be slightly extended in the X direction, and a large extension in the Y direction is required, as shown in fig. 6. The area of the luminous surface (8) of the sub-pixel is small, the brightness is high, the area of the non-luminous area (7) of the peripheral sub-pixel is large, and the high contrast caused by the pixel structure leads the screen window effect to be obvious; under the action of the cylindrical lens grating phase plate (1), the area of the luminous surface (8) of the sub-pixel is expanded, the brightness is reduced, the contrast is reduced, the area of the peripheral non-luminous area is reduced, and the screen window effect is reduced; the focal length f of the cylindrical lens grating phase plate (1) is further reduced, so that the area of the luminous surface (8) of the sub-pixel is expanded, the adjacent sub-pixels are overlapped, but the expansion range is limited within a complete pixel range, and the screen window effect can be eliminated without reducing the image definition.

The optimal range of the grating pitch of the lenticular grating (5) is 40-50 LPI, namely the width of each cylindrical lens is 0.508-0.635 mm, the grating pitches of the two layers of lenticular gratings (5) forming the lenticular grating phase plate (1) can be the same or different, generally, the two layers of lenticular gratings are the same, the area of the lenticular grating phase plate (1) is 40mm, and the lenticular grating phase plate only comprises about 60 cylindrical lenses, so that the mold processing cost is low.

According to the difference of the type and the resolution of the display screen (3) and the magnification of the VR lens (2), the focal length f of the lenticular grating (5) has a wider selection range and can be determined according to a specific application scene; for the OLED screen with the pixels arranged in a diamond shape, the two layers of the cylindrical lens gratings (5) of the cylindrical lens grating phase plate (1) can adopt the same focal length design, and the optimal range is about 150-200 mm; for the LCD screen with standard RGB arrangement, two layers of orthogonal lenticular gratings (5) of the lenticular grating phase plate (1) adopt different focal length designs, and the focal length difference between the two layers is larger, even only a single layer of lenticular grating (5) can be used, which is equivalent to the infinite focal length of another layer of lenticular grating (5)With light spreading capability only in the Y direction. The method comprises the steps of utilizing a mold to carry out hot extrusion molding on plastic transparent materials such as PET, PVC, PMMA and the like, or curing high-refractive-index UV glue on a transparent film base to form the lenticular grating (5), wherein the refractive index of the convex surface of the lenticular grating (5) is n ₁ The refractive index of the low-refractive-index UV glue (6) filling the convex surface of the cylindrical lens grating (5) is n ₂ Relative refractive index n = n ₁ /n ₂ . The low-refractive-index UV glue (6) not only plays a role in reducing the relative refractive index n, but also serves as an adhesive for fixing a structural part. In general, n is ₁ About 1.5, n ₂ About 1.4, the above-mentioned comparative invention PCT/US2017/044958 does not use the low refractive index glue leveling method, and the refractive index n = n of PMMA ₁ =1.5, the curvature radius of the micro-lens R =85mm, the height of the micro-lens is only about 0.5um, and it is difficult to process such a high-precision mold by conventional equipment and process; the relative refractive index n = n of the lenticular grating phase plate (1) ₁ /n ₂ And =1.07, according to a calculation formula f = R/(n-1) of the relationship between the focal length f and the curvature radius of the plano-convex lens, the focal length f is kept the same as that of the phase optical device of the microlens of the invention, the curvature radius R =12mm of the cylindrical lens, the arch height reaches 3.8um, and the process difficulty of mold processing is greatly reduced.

Adjusting the curvature radius R value of the cylindrical lens of the lenticular grating (5) or adjusting the refractive index n of the low-refractive-index UV glue (6) ₂ The focal length f of the cylindrical lens grating phase plate (1) can be changed, the extension range of the luminous surface (8) of the sub-pixel can be accurately controlled, and the purpose of reducing the screen window effect is achieved.

The screen window effect that disappears VR lens form by the bonding of lenticular grating phase place board (1) and VR lens (2), be close to one side of people's eye in lenticular grating phase place board (1), can also adhere suitable plano-convex lens of degree (10) or plano-concave lens (11) and solve the defocus problem that appears when presbyopia, myopia patient watched the VR, as shown in figure 7. Transparent UV glue (4) between the plano-convex lens (10) or the plano-concave lens (11) and the lenticular phase plate (1) and the VR lens (2) has no requirement on the size of the refractive index, and can be replaced by low-refractive-index UV glue (6), and the low-refractive-index UV glue (6) with the preset refractive index must be used for bonding the convex surface of the lenticular, so that the description of the relative position relationship of the convex surface of the lenticular grating (5) is not a necessary condition but is the optimal setting.

The lenticular phase plate (1) can also adopt a single-layer lenticular grating (5), or a plurality of layers of lenticular gratings (5) which are stacked at a certain angle and bonded by a low-refractive-index UV glue (6), and the convex surface of the lenticular grating (5) is filled and leveled.

It is also possible to replace the cylindrical lens cross section of the lenticular sheet (5) with an inscribed polygonal broken line instead of an arc, i.e. to replace the cylindrical lens with a polygonal prism.

The drawings are drawn schematically according to the best design, and where the description of the positional relationship of some structures is not clear enough in the specification, it can be understood by referring to the drawings that the X and Y directions are not particularly horizontal and vertical directions, and should be determined by combining the structure and arrangement of the pixels of the display screen.

Description of the drawings:

FIG. 1 is a schematic diagram of the position of a phase optic in a comparative invention.

Fig. 2 is a schematic diagram of the arrangement of microlenses on a phase optic in a comparative invention.

FIG. 3 is a schematic diagram of a display structure of a VR lens with a screen elimination effect.

Figure 4 is a schematic diagram of a lenticular phase plate structure.

FIG. 5 is a schematic diagram of the light emitting surface expansion of a diamond OLED panel sub-pixel.

FIG. 6 is an expanded schematic view of the light emitting surface of a sub-pixel of an LCD panel.

Fig. 7 is a schematic diagram of a screen effect elimination VR lens structure capable of compensating for vision.

The drawings in the above drawings are numbered:

the display device comprises a 1 cylindrical lens grating phase plate, a 2VR lens, a 3 display screen, 4 transparent UV glue, 5 cylindrical lens grating, 6 low-refractive-index UV glue, 7 sub-pixel non-luminous areas, 8 sub-pixel luminous areas, 9 sub-pixel luminous area expansion areas, 10 plano-convex mirrors and 11 plano-concave mirrors.

One of the cores of the utility model is that the one-dimensional amplification characteristic of the lenticular grating to the light is utilized, and the extension degree of the luminous surface of the sub-pixel in the X and Y directions can be respectively adjusted by orthogonal stacking; secondly, filling the cylindrical lens grating with low-refractive-index UV glue to greatly reduce the curvature radius of the cylindrical lens and reduce the requirement on processing precision; thirdly, the cylindrical lens number of the lenticular grating is far smaller than the spherical lens number of the micro lens array, and the mold processing technology is simple.

The utility model discloses a screen window effect VR lens disappears, can be through changing refracting index n that curvature radius R or low refracting index UV glued ₂ The focal length f of a lens unit on the lenticular grating phase plate (1) is adjusted, the expansion degree of the luminous surface (8) of the sub-pixel in the X and Y directions is accurately controlled, the area expansion is enabled to be as large as possible and controlled within the area occupied by the sub-pixel or the pixel, the overlapping with the adjacent pixel is avoided, the screen window effect is eliminated, and meanwhile the resolution ratio is kept not to be reduced. The VR lens with the screen window effect eliminated is bonded into a compact and simple integral structure, and is very convenient to mount, use and clean. The VR lens for eliminating the screen window effect has the advantages of simple structure, low cost, high light transmittance and obvious effect of eliminating the screen window, and can be used as a low-cost VR display scheme in cooperation with a mobile phone screen to realize high-color gamut, high-brightness and HDR high-quality VR display effect.

The specific implementation mode is as follows:

in the first embodiment, the VR lens with the degreening window effect is formed by combining the lenticular phase plate (1) and the VR lens (2), the VR lens (2) is a plano-convex lens, and the plane of the plano-convex lens is bonded with the lenticular phase plate (1) through the transparent UV glue (4), as shown in fig. 3. The cylindrical lens grating phase plate (1) is formed by orthogonally superposing two layers of cylindrical lens gratings (5), the convex surfaces of the cylindrical lens gratings (5) are opposite, and the middle of the cylindrical lens gratings is filled and adhered by low-refractive-index UV glue (6), as shown in figure 4. The grating pitch range of the lenticular grating (5) is 40-50 LPI, the refractive index range of the convex surface of the lenticular grating (5) is 1.47-1.65, the curvature radius R range of the cylindrical lens of the lenticular grating (5) is 10-25 mm, and the refractive index range of the low-refractive-index UV glue (6) is 1.33-1.43. For the diamond-type arranged OLED screen, the two layers of lenticular gratings (5) are designed by adopting the same grating pitch and curvature radius; for the LCD screen with standard RGB arrangement, two layers of orthogonal lenticular gratings (5) adopt the same grating pitch and different focal length designs, and the difference of the f value of the focal length of the two layers is larger, or the lenticular grating phase plate (1) only adopts the structure of one layer of lenticular grating (5).

In the second embodiment, the screen effect eliminating VR lens is formed by gluing a plano-convex lens (10) or a plano-concave lens (11), a cylindrical lens grating phase plate (1) and a VR lens (2), so as to solve the out-of-focus problem when presbyopia and myopia patients watch VR, as shown in fig. 7. In some simple and compact VR glasses designs, the distance between the VR lens (2) and the display screen (3) can not be adjusted or the adjustment stroke is small, the purpose of clearly seeing images can be achieved by changing the design of the focal length of the VR lens (2) in principle, a plano-convex mirror (10) or a plano-concave mirror (11) is not needed for adjustment, and on the premise of mass production of basic devices, namely a cylindrical lens grating phase plate (1) and the VR lens (2), the scheme is beneficial to reducing cost and increasing adaptability.

Claims

1. The utility model provides a screen window effect VR lens that disappears, its characterized in that, by cylinder grating phase plate (1) with VR lens (2) combination form, an terminal surface of VR lens (2) is the plane, VR lens (2) can be plano-convex lens, fresnel lens or Pancake folding optics module etc. VR lens (2) the plane end of VR lens (2) is glued together with cylinder grating phase plate (1) through transparent UV glue (4), and sub-pixel light emitting area (8) expand peripheral sub-pixel non-light emitting area (7) under the effect of cylinder grating phase plate (1), and sub-pixel light emitting area expansion area (9) luminance reduces the contrast and reduces, has alleviateed the screen window effect that VR shows.

2. The VR lens of claim 1, further characterized in that the lenticular phase plate (1) is formed by two layers of lenticular lenses (5) stacked orthogonally, the convex surfaces of the lenticular lenses (5) are filled and bonded with a low-refractive-index UV glue (6), the filling of the convex surfaces of the lenticular lenses by the low-refractive-index UV glue (6) reduces the relative refractive index n of the lenticular lenses (5), reduces the radius of curvature R of the lenticular lenses, reduces the difficulty of mold processing, and adjusts the radius of curvature R of the lenticular lenses (5), or adjusts the refractive index n of the low-refractive-index UV glue (6) ₂ The focal length f of the lenticular phase plate (1) can be changed.

3. A VR lens as claimed in claim 2 further characterised in that the two lenticular lenses (5) are each designed with a different focal length f to control precisely the extent to which the light emitting surface extension (9) of a sub-pixel extends in the X and Y directions so that adjacent sub-pixels overlap and the extent is limited to within one pixel range, eliminating the screen effect without degrading the image sharpness.

4. A VR lens as claimed in claim 2, further characterised in that when the display screen is a diamond-type arrangement of OLED screens, the two lenticular patterns (5) are designed with the same pitch and radius of curvature; when the display screen is an LCD screen with standard RGB arrangement, the two layers of lenticular gratings (5) adopt the same grating pitch and different focal length designs, or the lenticular grating phase plate (1) only adopts the structure of one layer of lenticular grating (5).

5. A VR lens as claimed in claim 2, further characterised in that the pitch of the lenticular lens (5) is in the range 40 to 50LPI, the radius of curvature R of the cylindrical lens is in the range 10 to 25mm, the refractive index of the cylindrical lens is in the range 1.47 to 1.65, and the refractive index of the low refractive index UV glue (6) is in the range 1.33 to 1.43.

6. A VR lens as claimed in claim 2, further characterised in that on the side of the lenticular phase plate (1) near the eye, there is cemented a number of plano-convex (10) or plano-concave (11) mirrors to correct the out-of-focus problem that occurs when a presbyopic, myopic patient views the VR.

7. A VR lens as claimed in claim 1, further characterised in that the lenticular phase plate (1) is bonded in an angular stack using multiple layers of lenticular lenses (5), the convex surfaces of all the lenticular lenses (5) being filled with a low refractive index UV glue (6).

8. A VR lens as claimed in claim 1, 2 or 5, further characterised in that the cylindrical lens cross-section of the lenticular (5) is curved with an inscribed polygonal broken line instead, i.e. the cylindrical lens is replaced with a polygonal prism.