High-immersion virtual image and far image display system

Abstract

The invention discloses a high-immersion virtual image and far image display system which comprises a display source, a gluing type light splitting composite Fresnel lens is arranged on one side of the display source, and a curved reflector is arranged above or below the display source. And the display source and the curved reflector are positioned on the same side of the glued light-splitting composite Fresnel lens. According to the invention, two complementary Fresnel lenses are combined to form the glued light-splitting composite Fresnel lens, and the glued light-splitting composite Fresnel lens and the curved-surface reflector are used for combined light control, so that the optical aberration of imaging is inhibited to a greater extent, the lighting effect is improved, the size is small, the display quality is high, the problems that a traditional virtual reality head-mounted device is heavy and poor in comfort are solved, and the visual effect of the head-mounted device is improved. And high-quality immersive experience can be provided for the user.

Description

Technical Field

[0001] The invention relates to the field of optical display, in particular to a highly immersive virtual image and telescopic image display system. Background Art

[0002] Virtual reality display technology is to use computers or mobile terminals to simulate the real world and project it onto the human eye retina through a certain display system. Its essence is to present a spatial picture that can be observed in real time and without restrictions from the user's perspective. Virtual reality display technology has been widely used in entertainment, culture, and medical fields. At present, when using it, users usually use head-mounted display devices, such as VR glasses, to watch the realistic pictures produced by virtual reality technology.

[0003] However, since head-mounted devices are usually bulky, wearing them for a long time will cause a sense of pressure on the user's head, face and nose bridge, affecting the wearing comfort. In addition, due to the size of the device, it is impossible to carry high-performance hardware devices, the display quality is not high, and it cannot provide users with a highly immersive experience. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a highly immersive virtual image and telescopic image display system which solves the problems of poor comfort, large device size and low display quality in the prior art.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the present invention is: a highly immersive virtual image and telescopic image display system, including a display source, a glued-type splitting compound Fresnel lens is provided on one side of the display source, and a curved reflector is provided above or below the display source; the display source and the curved reflector are located on the same side of the glued-type splitting compound Fresnel lens.

[0006] Furthermore, the cemented beam-splitting composite Fresnel lens is formed by tightly bonding a beam-splitting Fresnel lens and a complementary Fresnel lens; the refractive indexes of the beam-splitting Fresnel lens and the complementary Fresnel lens are similar or equal.

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

[0008] Furthermore: the concave surface of the curved reflector faces the cemented light-splitting composite Fresnel lens; the surface of the curved reflector is a spherical surface, an aspherical surface or a free-form surface, and an off-axis amount is additionally set.

[0009] Furthermore, the magnification X of the virtual image finally formed satisfies the relationship:

[0010]

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

[0012] Furthermore, the distance between the final virtual image and the observer's eyes is D, which is expressed as:

[0013]

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

[0015]

[0016] Among them, tan represents the tangent function; sin represents the sine function; arcsin represents the inverse sine function.

[0017] The beneficial effects of the present invention are as follows: the present invention is small in size and light in weight, and can achieve virtual reality effects without wearing a head-mounted device, and the generated virtual image is of high quality, which can enable users to obtain a more immersive experience, and the system can be set up according to user needs, which is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a highly immersive virtual image and telescopic image display system proposed by the present invention;

[0019] Figure 2This is an exploded view of a cemented beam splitting compound Fresnel lens;

[0020] Figure 3 This is a side view of a highly immersive virtual image and telescopic image display system provided by the present invention.

[0021] Among them: 1. display source; 2. cemented spectroscopic composite Fresnel lens; 3. curved reflector; 21. spectroscopic Fresnel lens; 22. Fresnel lens. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0023] like Figure 1 , Figure 3 As shown, a highly immersive virtual image telescopic image display system proposed by the present invention is composed of a display source 1, a glued light-splitting composite Fresnel lens 2 and a curved reflector 3. A glued light-splitting composite 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 glued light-splitting composite Fresnel lens 2. The concave surface of the curved reflector 3 faces the glued light-splitting composite Fresnel lens 2; the surface of the curved reflector 3 is a spherical surface, an aspherical surface or a free-form surface, and an additional off-axis amount is set, which is beneficial to improving the imaging quality. The angle between the display source 1 and the vertical direction is θ1, 15°≤θ1≤40°; the angle between the glued light-splitting composite Fresnel lens 2 and the vertical direction is θ2, 0°≤θ2≤20°; the angle between the curved reflector 3 and the vertical direction is θ3.

[0024] The display content is provided by the display source 1, and the light emitted by it propagates to the glued spectral composite Fresnel lens 2 and then reflects to the curved reflector 3, and then reaches the glued spectral composite Fresnel lens 2 again after being reflected by the curved reflector 3, and is transmitted through the glued spectral composite Fresnel lens 2 to enter the observer's eyes, and finally forms an enlarged virtual image at a distance D in front of the viewing area, so that the user can obtain a highly immersive viewing experience.

[0025] The light emitted by the display source 1 will form an image on the curved reflector 3, and the image will be bent into a curved surface. When the human eye directly observes this image, it will be clearly felt that the image at the edge is curved, and when moving left and right, the image will be felt to be distorted left and right. This is due to the existence of optical aberrations, which causes the distribution of the imaging light to be inconsistent with the distribution of the original image. Since the aberration suppression ability of a single optical element is relatively weak, a beam splitting Fresnel lens 21 is set to make the curved reflector 3 and the beam splitting Fresnel lens 21 jointly perform optical regulation, thereby suppressing aberrations to a large extent. First, the parameters of the curved reflector 3, such as the radius of curvature, size, and position to the human eye, are determined according to the imaging performance indicators required by the user, such as imaging size, viewing angle, and imaging area; then, the optical aberration of the curved reflector 3 is evaluated according to the parameters of the curved reflector 3, and then the parameters of the spectroscopic Fresnel lens 21, such as the radius of curvature, size, pitch, and distance to the curved reflector, are designed according to the evaluation results of the optical aberration of the curved reflector 3, so as to ensure that the spectroscopic Fresnel lens 21 can first pre-modulate the light emitted by the display source 1, and the pre-modulated light is then modulated by the curved reflector 3, and finally an image without aberration is generated. The pre-modulation is to pre-deform the image in the opposite direction of the deformation trend of the curved reflector 3 on the image, so that the deformation effect of the curved reflector 3 on the image and the deformation effect of the pre-modulation offset each other, eliminating the adverse effects of the curved reflector 3 on the image.

[0026] The magnification of a highly immersive virtual image and telescopic image display system proposed by the present invention is X, and its expression is:

[0027]

[0028] Wherein, R2 is the radius of curvature of the glued spectroscopic composite Fresnel lens 2; R3 is the radius of curvature of the curved reflector 3; d1 is the straight-line distance from the center point of the display source 1 to the center point of the glued spectroscopic composite Fresnel lens 2; d2 is the straight-line distance from the center point of the glued spectroscopic composite Fresnel lens 2 to the center point of the curved reflector 3; d3 is the straight-line distance from the center point of the curved reflector 3 to the observer's eye; β1 is the angle between the incident light along the optical axis on the spectroscopic surface of the glued spectroscopic composite Fresnel lens 2 and the normal of the incident point; β2 is the angle between the incident light along the optical axis on the curved reflector 3 and the normal of the incident point; cos represents the cosine function.

[0029] The distance between the virtual image and the observer's eye is D, which is expressed as:

[0030]

[0031] Wherein, a is the angle between the light emitted by the display source 1 and the normal line of the display source 1 plane; b is the angle between the light entering the observer's eye and the normal line of the virtual image plane; and b satisfies the relationship:

[0032]

[0033] Among them, tan represents the tangent function; sin represents the sine function; arcsin represents the inverse sine function.

[0034] like Figure 2 As shown, the cemented spectroscopic composite Fresnel lens 2 is formed by tightly bonding a spectroscopic Fresnel lens 21 and a complementary Fresnel lens 22, and there is no other medium between the two, which can prevent some large-angle light from passing through other media during the process from the Fresnel lens 22 to the spectroscopic Fresnel lens 21 and undergoing total reflection, thereby reducing the light efficiency. The refractive indexes of the spectroscopic Fresnel lens 21 and the Fresnel lens 22 are similar or equal, thereby reducing the optical path deviation that may be generated 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 the 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 shape of the Fresnel lens 22 is determined by the surface shape of the light-splitting Fresnel lens 21. The two are aligned and embedded to form a rectangular parallelepiped, that is, a glued light-splitting composite Fresnel lens 2. Since the light-splitting film on the light-splitting Fresnel lens 21 can transmit a part of the light and reflect a part of the 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, and then reflected by the light-splitting Fresnel lens 21 to the curved reflector 3, and then reflected back to the Fresnel lens 22, and transmitted through the light-splitting Fresnel lens 21, and finally formed a virtual image. The light-splitting Fresnel lens 21 is a circular Fresnel lens or a linear Fresnel lens; the surface of the light-splitting Fresnel lens 21 is a spherical surface or an aspherical surface, and an off-axis value is additionally set, and the off-axis value range is 80 mm to 720 mm; the light-splitting surface of the light-splitting Fresnel lens 21 is provided with a plurality of tooth patterns; in order to prevent the generation of stray light, the bottom angle α of a tooth pattern in the light-splitting Fresnel lens 21 is i The angle a between the light emitted by the display source 1 reaching the tooth pattern and the normal line of the display source 1 plane satisfies the relationship α i +θ2≤a+θ1.

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

[0036] The present invention is small in size and light in weight, and can achieve virtual reality effects without wearing a head-mounted device. The generated virtual image is of high quality, enabling users to obtain a more immersive experience. The system can be set up according to user needs and is flexible.

Claims

1. A highly immersive virtual image and telescopic image display system, characterized in that: The display source (1) comprises a display source (1), a glued light-splitting composite Fresnel lens (2) being provided on one side of the display source (1), and a curved reflector (3) being provided above or below the display source (1); the display source (1) and the curved reflector (3) being located on the same side of the glued light-splitting composite Fresnel lens (2).

2. A highly immersive virtual image and telescopic image display system according to claim 1, characterized in that: 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 indexes of the beam splitting Fresnel lens (21) and the complementary Fresnel lens (22) are similar or equal.

3. A highly immersive virtual image and telescopic image display system according to claim 2, characterized in that: The beam splitting surface of the beam splitting Fresnel lens (21) is coated with a beam splitting film, 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 a spherical surface or an aspherical surface, and an additional off-axis amount is set; the beam splitting surface of the beam splitting Fresnel lens (21) is provided with a plurality of tooth patterns; the bottom angle α of a tooth pattern in the beam splitting Fresnel lens (21) is i The angle a between the light emitted by the display source (1) reaching the tooth pattern and the normal line of the display source (1) plane satisfies the relation α i +θ2≤a+θ1; wherein θ1 represents the angle between the display source (1) and the vertical direction, and is 15°≤θ1≤40°; θ2 represents the angle between the cemented light-splitting composite Fresnel lens (2) and the vertical direction, and is 0°≤θ2≤20°.

4. The highly immersive virtual image and telescopic image display system according to claim 1, characterized in that: The concave surface of the curved reflector (3) faces the cemented light-splitting composite Fresnel lens (2); the surface of the curved reflector (3) is a spherical surface, an aspherical surface or a free-form surface, and an off-axis amount is additionally set.

5. The highly immersive virtual image and telescopic image display system according to claim 1, characterized in that: The magnification X of the final virtual image satisfies the relationship: Wherein, R2 is the radius of curvature of the glued beam splitting composite Fresnel lens (2); R3 is the radius of curvature of the curved reflector (3); d1 is the straight-line distance from the center point of the display source (1) to the center point of the glued beam splitting composite Fresnel lens (2); d2 is the straight-line distance from the center point of the glued beam splitting composite Fresnel lens (2) to the center point of the curved reflector (3); d3 is the straight-line distance from the center point of the curved reflector (3) to the observer's human eye; β1 is the angle between the incident light along the optical axis on the beam splitting surface of the glued beam splitting composite Fresnel lens (2) and the normal of the incident point; β2 is the angle between the incident light along the optical axis on the curved reflector (3) and the normal of the incident point; and cos represents the cosine function.

6. A highly immersive virtual image and telescopic image display system according to claim 5, characterized in that: The distance between the final virtual image and the observer's eyes is D, which is expressed as: Wherein, a is the angle between the light emitted by the display source (1) and the normal line of the display source (1) plane; b is the angle between the light entering the observer's eyes and the normal line of the virtual image plane; and b satisfies the relationship: Among them, tan represents the tangent function; sin represents the sine function; arcsin represents the inverse sine function.

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