High-immersion virtual image telecentric display system

Abstract

The application discloses a kind of high immersion virtual image far image display systems, including display source, the side of the display source is equipped with glue type split light composite fresnel lens, the upper or lower of the display source is equipped with curved mirror;Display source and curved mirror are located in the same side of glue type split light composite fresnel lens.The application uses two complementary fresnel lenses to combine into glue type split light composite fresnel lens, and the light is controlled in combination with curved mirror, the optical aberration of imaging is inhibited to a greater extent, the light efficiency is improved, and the application is small in size, high in display quality, not only solves the problem that traditional virtual reality head-mounted device is heavy and comfortable, but also can provide high-quality immersive experience for users.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical display, and particularly relates to a high-immersion virtual image teleimage display system. BACKGROUND

[0002] Virtual reality display technology is to virtually present a real world through a computer or a mobile terminal and the like, and project to a human eye retina through a certain display system, and the essence is to present a space picture which can be observed in real time and without limitation with a user's visual angle as a main body. The virtual reality display technology has been widely applied in many fields such as entertainment, cultural and educational exhibition, medical treatment and the like. At the present stage, when used, a user usually watches a lifelike picture generated by the virtual reality technology by means of a head-mounted display device, for example, a VR glasses.

[0003] However, since the head-mounted device is usually bulky, a long-time wearing will bring a compression feeling to a user's head, face and nose bridge, and affect the wearing comfort, and due to the limitation of the device volume, a high-performance hardware device cannot be carried, the display quality is not high, and a high-immersion experience cannot be provided for the user. SUMMARY

[0004] In view of the above problems in the prior art, the present application provides a high-immersion virtual image teleimage display system, which solves the problems of poor comfort, large device volume and low display quality in the prior art.

[0005] In order to achieve the above-mentioned application purposes, the technical scheme adopted by the present application is as follows: a high-immersion virtual image teleimage display system, comprising a display source, a glued-type split-light composite Fresnel lens is arranged on one side of the display source, and a curved mirror is arranged above or below the display source; the display source and the curved mirror are located on the same side of the glued-type split-light composite Fresnel lens.

[0006] Further, the glued-type split-light composite Fresnel lens is formed by tightly adhering a split-light Fresnel lens and a complementary Fresnel lens; the refractive indexes of the split-light Fresnel lens and the complementary Fresnel lens are similar or equal.

[0007] Further, the split surface of the split-light Fresnel lens is coated with a split film, and the split surface of the split-light Fresnel lens faces the display source; the split-light Fresnel lens is a circular Fresnel lens or a linear Fresnel lens; the surface type of the split-light Fresnel lens is a spherical surface or an aspherical surface, and an off-axis amount is additionally set; the split surface of the split-light Fresnel lens is provided with a plurality of tooth patterns; the included angle a of a tooth pattern in the split-light Fresnel lens and the included angle a of the light emitted by the display source reaching the tooth pattern and the normal line of the display source plane satisfy the relationship a i and the included angle a of the light emitted by the display source reaching the tooth pattern and the normal line of the display source plane satisfy the relationship a i+θ2≤a+θ1; wherein θ1 represents the included angle between the display source and the vertical direction, and 15°≤θ1≤40°; θ2 represents the included angle between the lamination type light splitting composite Fresnel lens and the vertical direction, and 0°≤θ2≤20°.

[0008] Further, the concave surface of the curved mirror faces the lamination type light splitting composite Fresnel lens; the curved mirror has a spherical surface, an aspherical surface or a free curved surface, and an additional off-axis amount is set.

[0009] Further, the magnification X of the final formed virtual image satisfies the relationship:

[0010]

[0011] wherein R2 is the curvature radius of the lamination type light splitting composite Fresnel lens; R3 is the curvature radius of the curved mirror; d1 is the straight line distance from the center point of the display source to the center point of the lamination type light splitting composite Fresnel lens; d2 is the straight line distance from the center point of the lamination type light splitting composite Fresnel lens to the center point of the curved mirror; d3 is the straight line distance from the center point of the curved mirror to the observer's eye; β1 is the included angle between the light along the optical axis and the normal of the incident point on the light splitting surface of the lamination type light splitting composite Fresnel lens; β2 is the included angle between the light along the optical axis and the normal of the incident point on the curved mirror; and cos represents the cosine function.

[0012] Further, the distance between the final formed virtual image and the observer's eye is D, and the expression is:

[0013]

[0014] wherein a is the included angle between the light emitted by the display source and the normal of the display source plane; b is the included angle between the light entering the observer's eye and the normal of the virtual image plane; and b satisfies the relationship:

[0015]

[0016] wherein tan represents the tangent function; sin represents the sine function; and arcsin represents the inverse sine function.

[0017] The present application has the advantages that the present application has a small volume and a light weight, and can realize the virtual reality effect without wearing a head-mounted device, and the generated virtual image has a high quality, so that the user can obtain a more immersive experience, and the system can be set according to the user's demand, and has flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural diagram of a high immersion virtual image teleimage display system according to the present application;

[0019] Figure 2It is a exploded view of the glue type light splitting composite Fresnel lens;

[0020] Figure 3 It is a side view of the high immersion virtual image teleimage display system.

[0021] 1, display source; 2, glue type light splitting composite Fresnel lens; 3, curved mirror; 21, light splitting Fresnel lens; 22, Fresnel lens. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application are described below to facilitate the understanding of the present application for those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, it is obvious that all the inventions and creations using the concept of the present application are within the spirit and scope of the present application as defined and limited by the appended claims.

[0023] As shown in Figure 1 , Figure 3 A high immersion virtual image teleimage display system is provided, which comprises a display source 1, a glue type light splitting composite Fresnel lens 2 and a curved mirror 3. The display source 1 is provided with the glue type light splitting composite Fresnel lens 2 on one side, and the curved mirror 3 is provided above or below the display source 1. The display source 1 and the curved mirror 3 are located on the same side of the glue type light splitting composite Fresnel lens 2. The concave surface of the curved mirror 3 faces the glue type light splitting composite Fresnel lens 2. The surface type of the curved mirror 3 is spherical, aspherical or free-form surface, and the off-axis amount is additionally set, which is beneficial to improve the imaging quality. The angle between the display source 1 and the vertical direction is θ1, and 15°≤θ1≤40°. The angle between the glue type light splitting composite Fresnel lens 2 and the vertical direction is θ2, and 0°≤θ2≤20°. The angle between the curved mirror 3 and the vertical direction is θ3.

[0024] The display content is provided by the display source 1, and the light emitted therefrom propagates to the glue type light splitting composite Fresnel lens 2, is reflected to the curved mirror 3, is reflected again by the curved mirror 3, reaches the glue type light splitting composite Fresnel lens 2 again, and is transmitted through the glue type light splitting composite Fresnel lens 2 into the observer's eyes, so as to form an enlarged virtual image at a distance D in front of the viewing area, thereby enabling the user to obtain a high immersion viewing experience.

[0025] The light emitted by the display source 1 is imaged by the curved mirror 3, and the imaging is curved into a curved surface. When a person directly observes the image, it is obvious that the image at the edge position is curved, and when the image is moved left and right, it is felt that the image is twisted left and right. This is due to the existence of optical aberration, which causes the distribution of the imaging light to be inconsistent with the original image. Since the aberration suppression ability of a single optical element is relatively weak, a light splitting Fresnel lens 21 is arranged to perform optical regulation in combination with the curved mirror 3 and the light splitting Fresnel lens 21, thereby greatly suppressing the aberration. First, the parameters of the curved mirror 3 are determined according to the imaging performance indicators required by the user, such as the imaging size, the viewing angle, the imaging area, etc. The parameters of the curved mirror 3 include the radius of curvature, the size, the position to the human eye, etc. Then, the optical aberration of the curved mirror 3 is evaluated according to the parameters of the curved mirror 3. Then, the parameters of the light splitting Fresnel lens 21 are designed according to the evaluation result of the optical aberration of the curved mirror 3. The parameters of the light splitting Fresnel lens 21 include the radius of curvature, the size, the pitch, the distance to the curved mirror, etc. The light splitting Fresnel lens 21 can pre-modulate the light emitted by the display source 1. The pre-modulated light is modulated by the curved mirror 3, and finally an image without aberration is generated. The pre-modulation is to deform the image in the opposite direction of the deformation trend of the curved mirror 3. The deformation of the curved mirror 3 and the pre-modulation are offset to each other, and the adverse effect of the curved mirror 3 on the image is eliminated.

[0026] The magnification of the high-immersion virtual image far-image display system is X, and the expression is as follows:

[0027]

[0028] In the formula, R2 is the radius of curvature of the cemented light splitting composite Fresnel lens 2; R3 is the radius of curvature of the curved mirror 3; d1 is the straight-line distance from the center point of the display source 1 to the center point of the cemented light splitting composite Fresnel lens 2; d2 is the straight-line distance from the center point of the cemented light splitting composite Fresnel lens 2 to the center point of the curved mirror 3; d3 is the straight-line distance from the center point of the curved mirror 3 to the human eye of the observer; β1 is the included angle between the light ray along the optical axis and the normal line of the incident point on the light splitting surface of the cemented light splitting composite Fresnel lens 2; β2 is the included angle between the light ray along the optical axis and the normal line of the incident point on the curved mirror 3; and cos represents the cosine function.

[0029] The distance between the virtual image and the human eye of the observer is D, and the expression is as follows:

[0030]

[0031] In the formula, a is the included angle between the light ray emitted by the display source 1 and the normal line of the plane of the display source 1; b is the included angle between the light ray entering the human eye of the observer and the normal line of the virtual image plane; and b satisfies the relationship ：

[0032]

[0033] where tan denotes the tangent function; sin denotes the sine function; arcsin denotes the inverse sine function.

[0034] As shown in Figure 2 The glued-type light-splitting composite Fresnel lens 2 is formed by tightly adhering the light-splitting Fresnel lens 21 and the complementary Fresnel lens 22, and no other medium exists between the two, which can prevent some large-angle light from undergoing total reflection phenomenon when passing through other medium from the Fresnel lens 22 to the light-splitting Fresnel lens 21, thereby causing light efficiency to be reduced. The refractive indices of the light-splitting Fresnel lens 21 and the Fresnel lens 22 are similar or equal, thereby reducing the optical path deviation that may be caused by a single lens and improving the accuracy and stability of imaging. Figure 2 The shadow surface of the light-splitting Fresnel lens 21 is a light-splitting surface, the light-splitting surface of the light-splitting Fresnel lens 21 is coated with a light-splitting film, and the light-splitting surface of the light-splitting Fresnel lens 21 faces the display source 1. The surface type of the Fresnel lens 22 is determined according to the surface type of the light-splitting Fresnel lens 21, and the two are embedded after being aligned to form a cuboid, i.e., the glued-type light-splitting composite Fresnel lens 2. Since the light-splitting film on the light-splitting Fresnel lens 21 can transmit a part of light and reflect a part of light, the light from the display source 1 is transmitted to the light-splitting Fresnel lens 21 through the Fresnel lens 22 for pre-modulation, then reflected to the curved mirror 3 by the light-splitting Fresnel lens 21, then reflected back to the Fresnel lens 22, and transmitted through the light-splitting Fresnel lens 21, and finally forms a virtual image. The light-splitting Fresnel lens 21 is a circular Fresnel lens or a linear Fresnel lens; the surface type of the light-splitting Fresnel lens 21 is a spherical surface or an aspherical surface, and an off-axis amount is additionally set, and the value range of the off-axis amount is 80mm-720mm; the light-splitting surface of the light-splitting Fresnel lens 21 is provided with a plurality of tooth patterns; in order to prevent stray light from being generated, the included angle a i of the light emitted by the display source 1 reaching a tooth pattern in the light-splitting Fresnel lens 21 and the plane normal of the display source 1 satisfies the relationship formula a i + θ2≤ a + θ1.

[0035] In one embodiment of the present application, the display source 1 is an LCD display, and the angle θ1 between the display source 1 and the vertical direction is 40°. The angle θ2 between the glued-type light-splitting composite Fresnel lens 2 and the vertical direction is 20°, wherein the light-splitting Fresnel lens 21 is a circular Fresnel lens, the surface type is aspheric, the off-axis amount is 80 mm, the refractive index is 1.49, and a light-splitting film with a light-splitting ratio of 1:1 is coated on the light-splitting surface of the light-splitting Fresnel lens 21; the refractive index of the Fresnel lens 22 is 1.49. The surface type of the curved mirror 3 is free curved surface, and the curvature radius is 305.726 mm. The straight-line distance from the center point of the display source 1 to the center point of the glued-type light-splitting composite Fresnel lens 2, the straight-line distance from the center point of the glued-type light-splitting composite Fresnel lens 2 to the center point of the curved mirror 3, and the straight-line distance from the center point of the curved mirror 3 to the human eye of the observer can be set according to the virtual image distance or the magnification that the observer wants to see. Therefore, the present application can adapt to the needs of different users, and has strong flexibility.

[0036] The present application has small volume and light weight, and can realize virtual reality effect without wearing a head-mounted device, and has high quality of generated virtual image, can enable users to obtain more immersive experience, can be set according to user needs, and has flexibility.

Claims

1. A highly immersive virtual image distant image display system, characterized in that, Includes a display source (1), a cemented beam splitting Fresnel lens (2) is provided on one side of the display source (1), and a curved reflector (3) is provided above or below the display source (1); the display source (1) and the curved reflector (3) are located on the same side of the cemented beam splitting Fresnel lens (2); The cemented beam-splitting composite Fresnel lens (2) is formed by tightly bonding a beam-splitting Fresnel lens (21) and a complementary Fresnel lens (22); the refractive indices of the beam-splitting Fresnel lens (21) and the complementary Fresnel lens (22) are similar or equal. The beam-splitting Fresnel lens (21) has a beam-splitting film coated on its beam-splitting surface, and the beam-splitting surface of the beam-splitting Fresnel lens (21) faces the display source (1); the beam-splitting Fresnel lens (21) is a circular Fresnel lens or a linear Fresnel lens; the surface of the beam-splitting Fresnel lens (21) is spherical or aspherical, and has an additional set off-axis amount; the beam-splitting surface of the beam-splitting Fresnel lens (21) is provided with a number of teeth; The bottom angle of a certain tooth in a beam-splitting Fresnel lens (21) The angle between the light emitted from the display source (1) reaching the tooth pattern and the normal to the plane of the display source (1). Satisfying the relation ;in The angle between the display source (1) and the vertical direction is represented, and ; The angle between the cemented beam-splitting Fresnel lens (2) and the vertical direction and ; Magnification of the final virtual image Satisfying the relation: in, The radius of curvature of the cemented beam-splitting Fresnel mirror (2) is given by the following: Let be the radius of curvature of the curved mirror (3); The straight-line distance from the center point of the display source (1) to the center point of the cemented beam-splitting Fresnel lens (2); The straight-line distance from the center point of the cemented beam splitter Fresnel lens (2) to the center point of the curved mirror (3); The straight-line distance from the center point of the curved mirror (3) to the observer's eye; The angle between the incident ray along the optical axis and the normal of the incident point on the beam-splitting surface of the cemented beam-splitting composite Fresnel lens (2); θ is the angle between the incident ray along the optical axis on the curved mirror (3) and the normal to the incident point; cos represents the cosine function.

2. The highly immersive virtual image distant image display system according to claim 1, characterized in that, The concave surface of the curved mirror (3) faces the cemented beam splitter Fresnel lens (2); the surface of the curved mirror (3) is spherical, aspherical or freeform, and has an additional set off-axis amount.

3. The highly immersive virtual image distant image display system according to claim 1, characterized in that, The final virtual image is at a distance of 100° from the observer's eye. Its expression is: in, The angle between the light emitted from the display source (1) and the normal to the plane of the display source (1); Let be the angle between the ray of light entering the observer's eye and the normal to the virtual image plane; and Satisfying the relation: Where tan represents the tangent function; sin represents the sine function; and arcsin represents the arcsine function.

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