TWI691741B - Head-mounted display appaptus and lens - Google Patents

Abstract

A head-mounted display apparatus including two displays and a lens having refracting power is provided. The lens has a first and a second surfaces opposite from each other. The first surface has a first and a third regions. The second surface has a second and a fourth regions. The radius of curvatures of the abovementioned first to fourth regions are non-zero constant values. An imaging beam provided by one of the two displays is incident to the lens via the first region and emits out of the lens via the second region. An imaging beam provided by the other one of the two displays is incident to the lens via the third region and emits out of the lens via the fourth region. Furthermore, a lens is also provided.

Description

Head-mounted display device and lens

The invention relates to a display device and a lens, and in particular to a head-mounted display device and a lens applied to the head-mounted display device.

Virtual reality (Virtual Reality, VR) is the use of computer technology to generate a virtual world in a three-dimensional space, providing users with visual, auditory and other sensory simulations, allowing users to feel the experience. The current virtual reality devices are mainly based on visual experience. The two different viewing angles of the left and right eyes are used to simulate the parallax of the human eye. The image beam passes through the lens group in the virtual reality device and then Imaging the retina in the left and right eyes to produce a wide-angle view of the human eye.

However, in the prior art, a four-piece lens group is usually used to optically adjust the image beam, and the four-piece lens group is divided into two sub-lens groups (that is, each sub-lens group includes two The form of lens) is set in front of the left and right eyes. However, such a method requires a complicated assembly process, and corresponding tolerances are also generated during the assembly process, causing the image beam to deviate from the originally preset optical path and distorting the entire image screen.

The invention provides a lens, which can enable a head-mounted display device using the lens to produce a wide-angle display screen, and has good image quality.

The present invention provides a head-mounted display with a wide viewing angle and good image quality.

An embodiment of the present invention provides a head-mounted display device including two displays and a lens with a refractive index. The two displays provide corresponding video frames respectively. The lens has opposing first surfaces, second surfaces, and an optical axis. The first surface faces the two displays. The second surface faces away from the two displays. The first surface has a first area and a third area. The first area is located on the first side of the optical axis, and the third area is located on the second side of the optical axis. The second surface has a second area and a fourth area. The second area is located on the first side of the optical axis, and the fourth area is located on the second side of the optical axis. An image provided by one of the two displays enters the lens from the first area of the first surface and exits the lens from the second area of the second surface. Another image frame provided by the other of the two displays enters the lens from the third area of the first surface and exits the lens from the fourth area of the second surface. The radius of curvature of the first region is fixed and not zero. The radius of curvature of the third region is fixed and not zero. The radius of curvature of the second area is constant and not zero, and the radius of curvature of the fourth area is constant and not zero.

In an embodiment of the invention, the range of the radius of curvature of the first region and the radius of curvature of the third region falls within a range of 110 mm to 150 mm.

In an embodiment of the invention, the range of the system focal length of the above-mentioned lens falls within the range of 300 mm to 600 mm.

In an embodiment of the invention, the above-mentioned first surface further has a fifth area. The fifth area connects the first area and the third area.

In an embodiment of the invention, the above-mentioned fifth area is a plane.

In an embodiment of the invention, the radius of curvature of the aforementioned fifth area is a fixed value and is not zero.

In an embodiment of the present invention, the radius of curvature of the first region and the radius of curvature of the third region fall within a range of 20 mm to 45 mm.

In an embodiment of the invention, the range of the system focal length of the aforementioned lens falls within the range of 25 mm to 90 mm.

In an embodiment of the present invention, the radius of curvature of the second region and the radius of curvature of the fourth region fall within a range of 150 mm to 250 mm.

In an embodiment of the invention, the above-mentioned second surface further has a sixth area. The sixth area connects the second area and the fourth area.

In an embodiment of the invention, the above-mentioned sixth area is a plane.

In an embodiment of the invention, the radius of curvature of the sixth region described above is a fixed value and is not zero.

In an embodiment of the present invention, the radius of curvature of the sixth area is equal to the radius of curvature of the second area, and the radius of curvature of the sixth area is equal to the radius of curvature of the fourth area.

In an embodiment of the invention, the above-mentioned head-mounted display device has only one lens with a refractive index.

An embodiment of the present invention provides a lens with a refractive power. The lens has an optical axis. The lens includes a first surface and a second surface. The first surface has a first area and a third area. The first area is located on the first side of the optical axis. The third area is located on the second side of the optical axis. The second surface is opposite to the first surface. The second surface has a second area and a fourth area. The second area is located on the first side of the optical axis. The fourth area is located on the second side of the optical axis. The first side is opposite to the second side. The lens satisfies one of the following conditional combinations: Conditional combination 1: 110 mm ≤ R1 ≤ 150 mm, 110 mm ≤ R3 ≤ 150 mm, 150 mm ≤ R2 ≤ 250 mm and 150 mm ≤ R4 ≤ 250 mm; Conditional combination 2: 20 mm ≤ R1 ≤ 45 mm, 20 mm ≤ R3 ≤ 45 mm, 150 mm ≤ R2 ≤ 250 mm and 150 mm ≤ R4 ≤ 250 mm; The radius of curvature of the first region is R1, the radius of curvature of the third region is R3, the radius of curvature of the second region is R2, and the radius of curvature of the fourth region is R4.

In an embodiment of the invention, the above-mentioned first surface further has a fifth area. The fifth area connects the first area and the third area.

In an embodiment of the invention, the above-mentioned fifth area is a plane.

In an embodiment of the invention, the radius of curvature of the aforementioned fifth area is a fixed value and is not zero.

In an embodiment of the invention, the radius of curvature of the fifth region is equal to the radius of curvature of the first region, and the radius of curvature of the fifth region is equal to the radius of curvature of the third region.

In an embodiment of the present invention, when the above-mentioned lens meets Conditional Combination 1, the system focal length of the lens falls within the range of 300 mm to 600 mm.

In an embodiment of the invention, when the above-mentioned lens meets Conditional Combination 2, the system focal length of the lens falls within the range of 25 mm to 90 mm.

In an embodiment of the invention, the radius of curvature of the second region and the radius of curvature of the fourth region fall within a range of 150 mm to 250 mm.

In an embodiment of the invention, the above-mentioned second surface further has a sixth area, and the sixth area connects the second area and the fourth area.

In an embodiment of the invention, the above-mentioned sixth area is a plane.

In an embodiment of the invention, the radius of curvature of the sixth region described above is a fixed value and is not zero.

In an embodiment of the present invention, the radius of curvature of the sixth area is equal to the radius of curvature of the second area, and the radius of curvature of the sixth area is equal to the radius of curvature of the fourth area.

Based on the above, in the head-mounted display device and lens of the embodiment of the present invention, the curvature radii of the first and third regions of the first surface of the single lens (the surface facing the two displays) are designed to be fixed and not Zero, the radius of curvature of the second and fourth regions of the second surface of this lens (the surface facing away from the second display) is designed to be a fixed value and not zero. One of the two image frames can sequentially penetrate the first and third regions and exit the lens to be imaged by the user's eye, and the other of the two image frames sequentially penetrates the second and fourth regions and exit The lens can be imaged on the other eye of the user, thereby providing the user with a wide-angle image integration screen. Since the above lens is a monolithic lens, the head-mounted display device can provide a user with a better quality image integration screen with fewer assembly processes.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

FIG. 1 is a schematic diagram of a head-mounted display device according to an embodiment of the invention. FIG. 2 is an optical simulation diagram of the head-mounted display device of FIG. 1. It should be noted that, for simplicity, the carrier 130 is omitted in FIG. 2.

Please refer to FIGS. 1 and 2. In this embodiment, the head-mounted display device 100 includes two displays 110, a lens 120 and a carrier 130. The head-mounted display device 100 includes only one lens 120 having a refractive power. The above elements will be explained in detail in the following paragraphs.

The display 110 is an electronic component used to provide a user image screen. In this embodiment, the number of the display 110 is two, and they are respectively disposed in front of the user's left eye E1 and right eye E2 (as shown in FIG. 2 ). The type of the display 110 may be, for example, a liquid crystal display (Liquid Crystal Display), a light emitting diode display (Light Emitting Diode Display), a micro light emitting diode display (Micro LED display) or an organic light emitting diode display (Organic Light Emitting Diode Display), but not limited to this.

The lens 120 has a first surface 122, a second surface 124, and an optical axis I. The first surface 122 is opposite to the second surface 124. The first surface 122 faces the two displays 110, and may also be referred to as a display side. The second surface 124 faces the user's eye E, and may also be referred to as the side of the eye. The optical axis I has a first side S1 and a second side S2 opposite to each other, where the first side S1 corresponds to the left side of the user's left eye E1, and the second side S2 corresponds to the right side of the user's right eye E2, for example .

In this embodiment, the appearance of the lens 120 is, for example, a meniscus lens. In detail, the first surface 122 has a first area P1, a third area P3, and a fifth area P5. The first region P1 is located on the first side S1 of the optical axis I. The third region P3 is located on the second side S2 of the optical axis I. The optical axis I passes through the fifth area P5. The fifth area P5 connects the first area P1 and the third area P3. In this embodiment, the radius of curvature R1, R3, and R5 of the first, third, and fifth regions P1, P3, and P5, respectively, are all the same fixed value and are not zero. That is, the first, third, and fifth regions P1, P3, and P5 together form a continuous and smooth curved surface, that is, the entire first surface 122 is, for example, a spherical surface, and for example, a convex spherical surface with a convex surface facing the display 110. In the embodiment of the present invention, the radius of curvature R1, R3, and R5 can be designed to fall within the range of 110 mm to 150 mm, for example, to match the display 110 of different sizes. In this embodiment, preferably, the radii of curvature R1, R3, R5 are all designed to be 150 mm, for example.

On the other hand, the second surface 124 has a second area P2, a fourth area P4, and a sixth area P6. The second area P2 is located on the first side S2 of the optical axis I. The fourth area P4 is located on the second side S2 of the optical axis I. The optical axis I passes through the sixth area P6. The sixth area P6 connects the second area P2 and the fourth area P4. The curvature radii R2, R4, and R6 of the second, fourth, and sixth regions P2, P4, and P6 are also the same fixed value and are not zero. That is to say, the second, fourth, and sixth regions P2, P4, and P6 also form a continuous and smooth curved surface, that is, the entire second surface 124 is, for example, a spherical surface, and for example, a concave spherical surface facing the eye E. In the embodiments of the present invention, the radii of curvature R2, R4, and R6 can be designed to fall within the range of 150 mm to 250 mm, for example, for use with displays 110 of different sizes. In this embodiment, the radii of curvature R2, R4, R6 are all designed to be 200 mm, for example.

In addition, the design range of important parameters of the meniscus lens 120 in the embodiment of the present invention is as follows: The system focal length (EFL) of the lens 120 may be designed to fall within a range of 300 mm to 600 mm, for example. In this embodiment, the focal length of the system is, for example, 522 mm, but it is not limited thereto. The shortest distance between the first area P1 of the first surface 122 and the display 112 is, for example, 245 mm. It should be noted that the curvature radii R5 and R6 of the fifth area P5 and the sixth area P6 can be designed according to manufacturing process and design considerations, and the invention is not limited thereto.

The carrier 130 is used to carry the lens 120 and the two display elements 110. The second display 110 and the lens 120 are disposed in the carrier 130. The carrier 130 includes, for example, a headband (not shown), and the user can wear the head-mounted display device 100 on the head through the headband.

The optical effect of this embodiment will be described in detail in the following paragraphs.

Please refer to FIG. 2. In this embodiment, the two displays 110 respectively provide corresponding image beams. The first area P1 and the second area P2 of the lens 120 are located on the transmission path of the image beam provided by the display 112. The third area P3 and the fourth area P4 of the lens 120 are located on the transmission path of the image beam provided by the display 114. The image beam provided by the display 112 enters the lens 120 from the first area P1 of the first surface 122, and exits the lens 120 from the second area P2 of the second surface 124, and is imaged on the left eye E1 of the user, so that The user feels a part of the video screen. The image beam provided by the other display 114 enters the lens 120 from the third area P3 of the first surface 122, and exits the lens 120 from the fourth area P4 of the second surface 122, and is imaged on the right eye E2 of the user. So that the user can feel another part of the image screen. The fifth and sixth regions P5 and P6 do not have image light beams passing through, and may be referred to as an optically ineffective region. The width W1 of the optically ineffective region is, for example, 55 mm, but not limited thereto. According to this, the user can feel the wide-angle (for example, 210 degrees) image integration screen through the single lens 120, and can realize the application of virtual reality. Since the head-mounted display device 100 of this embodiment uses a single-lens lens 120, the assembly process required in the conventional multi-piece lens group and the picture distortion problems caused by the assembly process are avoided, so the head-mounted display device 100 can Provide users with good quality image integration screen.

In addition, because the different regions P2 and P4 in the second surface 124 as the side surface satisfy the conditional combination: 110 mm ≤ R2 ≤ 150 mm and 110 mm ≤ R4 ≤ 150 mm, and this surface design is more in line with most The glasses structure is not easy to cause structural interference with the glasses. Therefore, when a user wears near-sighted (or far-sighted) glasses and the head-mounted display device 100 at the same time, it is less likely to cause discomfort.

It should be noted that in the above-described embodiments, the curvature radii R1, R3, and R5 of the first, third, and fifth regions P1, P3, and P5, respectively, are designed to be the same. In other embodiments, it may be designed to be different from each other, or two of the three may be the same and the other may be different from the other two. Similarly, the curvature radii R2, R4, R6 of the second, fourth, and sixth regions P2, P4, P6 are designed to be the same as each other. In other embodiments, they can also be designed to be different from each other, or, It is possible that two of the three are the same and the other is different from the other two.

It must be noted here that the following embodiments follow the element numbers and partial contents of the above embodiments, wherein the same or similar reference numbers are used to indicate the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which will not be repeated here.

3 to 5 are optical simulation diagrams of head-mounted display devices of different embodiments. It should be noted that, for the sake of simplicity, the carrier 130 is omitted in FIGS. 3 to 5.

Please refer to FIG. 3, the head-mounted display device 100a and the lens 120a of FIG. 3 are similar to the head-mounted display device 100 and the lens 120 of FIG. 1, the main difference is that the fifth region R5a of the first surface 122a is a plane, and The sixth region R6a of the second surface 124a is flat. That is, the radius of curvature R5 and R6 of the fifth region P5a and the sixth region P6a are infinite.

Please refer to FIG. 4. The head-mounted display device 100 b and the lens 120 b of FIG. 4 are similar to the head-mounted display device 100 and the lens 120 of FIG. 1. The main difference is that in this embodiment, the appearance of the lens 120 b is, for example, The lenticular lens, that is, the two partial regions of the first surface 122b (ie, the first and third regions P1b, P3b) is more convex than the other regions (fifth region P5b). In the embodiment of the present invention, the radius of curvature R1 of the first region P1b may be designed to fall within a range of 20 mm to 45 mm, for example. The radius of curvature R3 of the third region P3b can be designed to fall within a range of 20 mm to 45 mm, for example. In this embodiment, the radius of curvature R1, R3 is, for example, 30 mm. On the other hand, the radius of curvature R2 of the second region P2b can be designed to fall within the range of 150 mm to 250 mm, for example. The radius of curvature R4 of the fourth region P4b may be designed to fall within a range of 150 mm to 250 mm, for example. In this embodiment, the radius of curvature R2, R4 is, for example, 200 mm. The radius of curvature R5 and R6 of the fifth area P5 and the sixth area P6 can be designed according to the manufacturing process and design considerations, and the invention is not limited thereto. The width W2 of the optically invalid area is, for example, 8 mm.

In addition, the important parameter design range of the lenticular lens 120b in the embodiment of the present invention is as follows: The system focal length of the lens 120b may be designed to fall within a range of 25 mm to 90 mm, for example. In this embodiment, the focal length of the system is, for example, 39.8 mm, but it is not limited to this. The shortest distance between the first area P1 of the first surface 122 and the display 112 is, for example, 41 mm. It should be noted that the curvature radii R5 and R6 of the fifth area P5 and the sixth area P6 can be designed according to manufacturing process and design considerations, and the invention is not limited thereto.

Please refer to FIG. 5. The head-mounted display device 100 c and the lens 120 c in FIG. 5 are similar to the head-mounted display device 100 b and the lens 120 b in FIG. 4. The main difference is that the fifth area P5 c and the sixth area P6 c are both flat. That is, the radius of curvature R5 and R6 of the fifth region P5c and the sixth region P6c are infinite.

In summary, in the head-mounted display device and lens of the embodiment of the present invention, the curvature radii of the first and third regions of the first surface of the single lens (the surface facing the two displays) are designed to be constant and If it is not zero, the radius of curvature of the second and fourth regions of the second surface of the lens (the surface facing away from the second display) is designed to be a fixed value and not zero. In other words, two opposite surfaces in a single lens integrate different radii of curvature. One of the two image frames can sequentially penetrate the first and third regions and exit the lens to be imaged by the user's eye, and the other of the two image frames sequentially penetrates the second and fourth regions and exit The lens can be imaged on the other eye of the user, thereby providing the user with a wide-angle image integration screen. Since the above-mentioned lens is a single-piece lens, it avoids the complicated assembly process in the conventional multi-piece lens group and the image distortion caused by the light path error caused by the assembly process, so the head-mounted display device can Fewer assembly processes provide users with better quality image integration screens.

In addition, when the first and second surfaces of the lens in the embodiment of the present invention meet one of the following conditional expression combinations 1 or 2, that is: conditional expression combination 1: 110 mm≤R1≤150 mm, 110 mm≤ R3≤150 mm, 150 mm≤R2≤250 mm and 150 mm≤R4≤250 mm, conditional combination 2: 20 mm≤R1≤45 mm, 20 mm≤R3≤45 mm, 150 mm≤R2≤250 mm and 150 mm ≤ R4 ≤ 250 mm, with the above-mentioned surface design, the image frame formed by the image beams emitted by the two monitors through the lens in the user's eyes is a wide-angle image frame, and the surface design conforms to most Glasses architecture. Therefore, when a user uses the head-mounted display device of the embodiment of the present invention while wearing glasses, it is less likely to cause discomfort.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

100, 100a~100c: head-mounted display device 110, 112, 114: display 120, 120a~120c: lens 122, 122a~122c: the first surface 124, 124a~124c: second surface E: eyes E1: left eye E2: right eye I: optical axis P1, P1a~P1c: the first area P2, P2a~P2c: the second area P3, P3a~P3c: the third area P4, P4a~P4c: the fourth area P5, P5a~P5c: Fifth area P6, P6a~P6c: the sixth area S1: First side S2: Second side W1, W2: the width of the optical ineffective zone

FIG. 1 is a schematic diagram of a head-mounted display device according to an embodiment of the invention. FIG. 2 is an optical simulation diagram of the head-mounted display device of FIG. 1. 3 to 5 are optical simulation diagrams of head-mounted display devices of different embodiments.

100: Head-mounted display device

110, 112, 114: display

120: lens

122: first surface

124: second surface

E: eyes

E1: left eye

E2: right eye

I: optical axis

P1: First area

P2: Second area

P3: Third area

P4: Fourth area

P5: Fifth area

P6: Sixth area

S1: First side

S2: Second side

W1: Width of optical ineffective area

Claims (20)

A head-mounted display device includes: two displays that respectively provide a corresponding image beam; and a lens having a refractive power, the lens having a first surface, a second surface and an optical axis opposite to each other, the The first surface faces the two displays, the second surface faces away from the two displays, wherein the first surface has a first area and a third area, the first area is located on a first side of the optical axis, the The third area is located on a second side of the optical axis, the second surface has a second area and a fourth area, the second area is located on the first side of the optical axis, and the fourth area is located on the optical axis The second side, wherein the first side is opposite to the second side, an image beam provided by one of the two displays enters the lens from the first area of the first surface, and The second area of the two surfaces emerges from the lens, and the other image beam provided by the other of the two displays enters the lens from the third area of the first surface, and from the second surface The fourth area emerges from the lens, wherein the radius of curvature of the first area is constant and not zero, and the radius of curvature of the third area is constant and not zero, The radius of curvature of the second area is constant and not zero, the radius of curvature of the fourth area is constant and not zero, wherein the first surface further has a fifth area, the fifth area is connected to the first area An area and the third area, and the fifth area is a plane. The head-mounted display device according to item 1 of the patent application scope, wherein the radius of curvature of the first area and the radius of curvature of the third area fall within a range of 110 mm to 150 mm. The head-mounted display device as described in item 2 of the patent application scope, wherein the system focal length of the lens falls within the range of 300 mm to 600 mm. The head-mounted display device according to item 1 of the scope of the patent application, wherein the radius of curvature of the first area and the radius of curvature of the third area fall within a range of 20 mm to 45 mm. The head-mounted display device as described in item 4 of the patent application scope, wherein the system focal length of the lens falls within the range of 25 mm to 90 mm. The head-mounted display device according to item 1 of the patent application scope, wherein the radius of curvature of the second area and the radius of curvature of the fourth area fall within a range of 150 mm to 250 mm. The head-mounted display device as described in item 1 of the patent application, wherein the second surface further has a sixth area, and the sixth area connects the second area and the fourth area. The head-mounted display device as described in item 7 of the patent application scope, wherein the radius of curvature of the sixth area is a fixed value and is not zero. The head-mounted display device as described in item 1 of the patent application scope, wherein the head-mounted display device has only one lens with a refractive index. A lens with a refractive power has an optical axis. The lens includes: a first surface having a first area and a third area, the first area is located on a first side of the optical axis, the third The region is located on a second side of the optical axis; and a second surface, with respect to the first surface, the second surface has a second region and a fourth region, the second region is located on the first side of the optical axis On one side, the fourth region is located on the second side of the optical axis, wherein the first side is opposite to the second side, wherein the lens further satisfies one of the following conditional combinations: Conditional combination 1: 110 mm

R1

150 mm, 110 mm

R3

150 mm, 150 mm

R2

250 mm and 150 mm

R4

250 mm; conditional combination 2: 20 mm

R1

45 mm, 20 mm

R3

45mm, 150mm

R2

250 mm and 150 mm

R4

250 mm, where the radius of curvature of the first area is R1, the radius of curvature of the third area is R3, the radius of curvature of the second area is R2, and the radius of curvature of the fourth area is R4, where the first surface A fifth area is further provided. The fifth area connects the first area and the third area, and the fifth area is a plane. The lens as described in item 10 of the patent application range, wherein when the lens meets Conditional Combination 1, the system focal length of the lens falls within the range of 300 mm to 600 mm. The lens as described in item 10 of the patent application range, wherein when the lens meets Conditional Combination 2, the system focal length of the lens falls within the range of 25 mm to 90 mm. The lens as described in item 10 of the patent application range, wherein the second surface further has a sixth area, and the sixth area connects the second area and the fourth area. The lens as described in item 13 of the patent application range, wherein the radius of curvature of the sixth region is a fixed value and is not zero. A head-mounted display device includes: two displays that respectively provide a corresponding image beam; and a lens having a refractive power, the lens having a first surface, a second surface and an optical axis opposite to each other, the The first surface faces the two displays, the second surface faces away from the two displays, wherein the first surface has a first area and a third area, the first area is located on a first side of the optical axis, the The third area is located on a second side of the optical axis, the second surface has a second area and a fourth area, the second area is located on the first side of the optical axis, and the fourth area is located on the optical axis The second side, wherein the first side is opposite to the second side, an image beam provided by one of the two displays enters the lens from the first area of the first surface, and The second area of the two surfaces exits the lens, The other image beam provided by the other of the two displays enters the lens from the third area of the first surface, and exits the lens from the fourth area of the second surface, wherein the first The radius of curvature of a region is constant and not zero, the radius of curvature of the third region is constant and not zero, the radius of curvature of the second region is constant and non-zero, the radius of curvature of the fourth region Is a fixed value and not zero, wherein the first surface further has a fifth area, the fifth area connects the first area and the third area, and the radius of curvature of the fifth area is equal to the curvature of the first area Radius, and the radius of curvature of the fifth area is equal to the radius of curvature of the third area. A head-mounted display device includes: two displays that respectively provide a corresponding image beam; and a lens having a refractive power, the lens having a first surface, a second surface and an optical axis opposite to each other, the The first surface faces the two displays, the second surface faces away from the two displays, wherein the first surface has a first area and a third area, the first area is located on a first side of the optical axis, the The third area is located on a second side of the optical axis, The second surface has a second area and a fourth area, the second area is located on the first side of the optical axis, the fourth area is located on the second side of the optical axis, wherein the first side is opposite to On the second side, an image beam provided by one of the two displays enters the lens from the first area of the first surface, and exits the lens from the second area of the second surface, the The other image beam provided by the other of the two displays enters the lens from the third area of the first surface, and exits the lens from the fourth area of the second surface, wherein the first The radius of curvature of the area is fixed and not zero. The radius of curvature of the third area is fixed and not zero. The radius of curvature of the second area is fixed and not zero. The radius of curvature of the fourth area is The value is fixed and not zero, wherein the second surface further has a sixth area, the sixth area connects the second area and the fourth area, and the sixth area is a plane. A head-mounted display device includes: two displays that respectively provide a corresponding image beam; and a lens having a refractive power, the lens having a first surface, a second surface and an optical axis opposite to each other, the The first surface faces the two displays, and the second surface faces away from the two displays, The first surface has a first area and a third area, the first area is located on a first side of the optical axis, the third area is located on a second side of the optical axis, and the second surface has A second area and a fourth area, the second area is located on the first side of the optical axis, the fourth area is located on the second side of the optical axis, wherein the first side is opposite to the second side, An image beam provided by one of the two displays enters the lens from the first area of the first surface, and exits the lens from the second area of the second surface, and the other of the two displays Another image beam provided by one enters the lens from the third area of the first surface, and exits the lens from the fourth area of the second surface, wherein the radius of curvature of the first area is Fixed value and not zero, the radius of curvature of the third area is fixed and not zero, the radius of curvature of the second area is fixed and not zero, the radius of curvature of the fourth area is fixed and not Zero, wherein the second surface further has a sixth area, the sixth area connects the second area and the fourth area, the radius of curvature of the sixth area is a fixed value and is not zero, the sixth area The radius of curvature is equal to the radius of curvature of the second area, and the radius of curvature of the sixth area is equal to the radius of curvature of the fourth area. A lens with a refractive power has an optical axis. The lens includes: a first surface having a first area and a third area, the first area is located on a first side of the optical axis, the third The region is located on a second side of the optical axis; and a second surface, with respect to the first surface, the second surface has a second region and a fourth region, the second region is located on the first side of the optical axis On one side, the fourth region is located on the second side of the optical axis, wherein the first side is opposite to the second side, wherein the lens further satisfies one of the following conditional combinations: Conditional combination 1: 110 mm

R1

150 mm, 110 mm

R3

150 mm, 150 mm

R2

250 mm and 150 mm

R4

250 mm; conditional combination 2: 20 mm

R1

45 mm, 20 mm

R3

45mm, 150mm

R2

250 mm and 150 mm

R4

250 mm, where the radius of curvature of the first area is R1, the radius of curvature of the third area is R3, the radius of curvature of the second area is R2, and the radius of curvature of the fourth area is R4, wherein the first surface It further has a fifth area connecting the first area and the third area, the radius of curvature of the fifth area is equal to the radius of curvature of the first area, and the radius of curvature of the fifth area is equal to the third area The radius of curvature of the area. A lens with a refractive power has an optical axis. The lens includes: a first surface having a first area and a third area, the first area is located on a first side of the optical axis, the third The region is located on a second side of the optical axis; and a second surface, with respect to the first surface, the second surface has a second region and a fourth region, the second region is located on the first side of the optical axis On one side, the fourth area is located on the second side of the optical axis, where the first side is opposite to the second side, wherein the lens further satisfies one of the following conditional expression combinations: Conditional Expression Combination 1: 110 mm

R1

150 mm, 110 mm

R3

150 mm, 150 mm

R2

250 mm and 150 mm

R4

250 mm; conditional combination 2: 20 mm

R1

45 mm, 20 mm

R3

45mm, 150mm

R2

250 mm and 150 mm

R4

250 mm, where the radius of curvature of the first area is R1, the radius of curvature of the third area is R3, the radius of curvature of the second area is R2, and the radius of curvature of the fourth area is R4, where the second surface A sixth area is further provided, the sixth area connects the second area and the fourth area, and the sixth area is a plane. A lens with a refractive power has an optical axis. The lens includes: a first surface having a first area and a third area, the first area is located on a first side of the optical axis, the third The region is located on a second side of the optical axis; and a second surface, with respect to the first surface, the second surface has a second region and a fourth region, the second region is located on the first side of the optical axis On one side, the fourth region is located on the second side of the optical axis, wherein the first side is opposite to the second side, wherein the lens further satisfies one of the following conditional combinations: Conditional combination 1: 110 mm

R1

150 mm, 110 mm

R3

150 mm, 150 mm

R2

250 mm and 150 mm

R4

250 mm; conditional combination 2: 20 mm

R1

45 mm, 20 mm

R3

45mm, 150mm

R2

250 mm and 150 mm

R4

250 mm, where the radius of curvature of the first area is R1, the radius of curvature of the third area is R3, the radius of curvature of the second area is R2, and the radius of curvature of the fourth area is R4, where the second surface It further has a sixth area connecting the second area and the fourth area. The radius of curvature of the sixth area is a fixed value and is not zero. The radius of curvature of the sixth area is equal to that of the second area The radius of curvature, and the radius of curvature of the sixth area is equal to the radius of curvature of the fourth area.

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