TWI524092B - Zoom lens with virtual display function - Google Patents

Description

Virtual display zoom lens

The present invention relates to a virtual display zoom lens, and more particularly to a virtual display zoom lens having a replaceable zoom element.

With the development of display devices, the size and weight of display devices have progressed toward miniaturization. In recent years, Head Mount Display (HMD) has been developed as an image display for virtual reality (VR) systems to be worn on the user's head, and the field of application is becoming more and more extensive. The head-mounted display places the display element in front of the user's eyes in the form of glasses or a helmet, and projects a virtual image on the user's eyes through the distance to generate a wide-angle view, and allows the user to receive image information anywhere.

However, the effective focal length (Effective Focal Lenth) of the head-mounted display is fixed (that is, the size of the virtual image cannot be adjusted). This design makes it impossible for the user to adjust the magnification of the virtual image and reduces the head-mounted type. The convenience of the display in use.

In view of the above problems of the prior art, it is an object of the present invention to provide a virtual display zoom lens comprising at least a first beam splitter, a display element, a second beam splitter, a mirror and a zoom element.

The first beam splitter is disposed on the transmission path of the light generated by the light source to reflect the light; the display component receives the light reflected by the first beam splitter to project the image light to penetrate the first beam splitter; The beam splitter is disposed on the transmission path of the image light, so that the image light penetrating the first beam splitter penetrates the second beam splitter; the mirror is disposed on the transmission path of the image light to reflect the second beam splitter The image light is such that the image light is reflected by the second beam splitter to the user's eyes; and the zoom element is alternatively disposed on one side of the second beam splitter to adjust the effective focal length of the virtual display zoom lens.

In addition, the virtual display zoom lens of the present invention may further include a quarter wave plate (Quarter Wavelength Plate) disposed between the first beam splitter and the display element.

The aforementioned zooming element can be selected, for example, from a group consisting of a positive lens and a negative lens.

The aforementioned display element can be, for example, a liquid crystal on silicon (LCoS) display element.

The aforementioned mirror can be, for example, a concave mirror (Concave Mirror).

According to an aspect of the present invention, a virtual display zoom lens is provided, comprising at least a first beam splitter disposed on a transmission path of a light generated by a light source for reflecting light; and a display element receiving light reflected by the first beam splitter The projected image light penetrates the first beam splitter; the second beam splitter is disposed on the transmission path of the image light, so that the image light penetrating the first beam splitter penetrates the second beam splitter; the mirror is disposed on the image light In the transmission path, the image light that penetrates the second beam splitter is reflected, so that the image light is reflected by the second beam splitter to the eyes of the user; and the zoom The component is disposed on one side of the second beam splitter to adjust the effective focal length of the virtual display zoom lens.

In addition, the virtual display zoom lens of the present invention may further include a quarter-wave plate disposed between the first beam splitter and the display element.

The aforementioned zoom element can be, for example, a liquid crystal lens.

The aforementioned display element can be, for example, a liquid crystal on silicon (LCoS) display element.

The aforementioned mirror can be, for example, a concave mirror.

As described above, the virtual display zoom lens according to the present invention may have one or more of the following advantages:

(1) The virtual display zoom lens of the present invention utilizes a replaceable zoom element to adjust the effective focal length of the virtual display zoom lens, thereby adjusting the magnification of the virtual image viewed by the user.

(2) The virtual display zoom lens of the present invention uses a liquid crystal lens to change the angle of the image light to adjust the effective focal length of the virtual display zoom lens, thereby adjusting the magnification of the virtual image viewed by the user.

For a better understanding and understanding of the technical features and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows.

10‧‧‧Light source

11‧‧‧Light

20‧‧‧First Beamsplitter

30‧‧‧Display components

31, 32‧‧‧ image light

40‧‧‧Second beam splitter

50‧‧‧Mirror

60‧‧‧User's eyes

70‧‧‧Zoom components

71‧‧‧ positive lens

72‧‧‧negative lens

73‧‧‧Combination of positive and negative lenses

74‧‧‧ liquid crystal lens

Figure 1 is a schematic view showing a first embodiment of a virtual display zoom lens of the present invention.

2 is a schematic view of a rotatable replacement zoom lens of the first embodiment of the virtual display zoom lens of the present invention.

Figure 3 is a schematic view showing a second embodiment of the virtual display zoom lens of the present invention.

The embodiments of the virtual display zoom lens according to the present invention will be described below with reference to the related drawings. For ease of understanding, the same components in the following embodiments are denoted by the same reference numerals.

Please refer to FIG. 1. FIG. 1 is a schematic view showing a first embodiment of a virtual display zoom lens according to the present invention. The virtual display zoom lens includes at least a first beam splitter 20, a display element 30, a second beam splitter 40, a mirror 50, and a zoom element 70.

The first beam splitter 20 is disposed on the transmission path of the light 11 generated by the light source 10 for reflecting the light 11 . The light source 10 can be, for example, a Light-Emitting Diode (LED); the first beam splitter 20 can be, for example, a polarization beam splitter; the light 11 can be, for example, polarized polarized light, such as P-polarized or S-polarized. .

In other words, the display element 30 receives the light 11 reflected by the first beam splitter 20 to project the image light 31 through the first beam splitter 20. The image light 31 projected by the display element 30 can be, for example, polarized light in the S polarization direction or polarized light in the P polarization direction, and the polarization direction of the image light 31 and the polarization direction of the light 11 can be orthogonal, for example.

The aforementioned display element 30 can be, for example, a reflective liquid crystal on silicon (LCoS) display element.

In addition, the second beam splitter 40 and the quarter wave plate 80 are disposed on the transmission path of the image light 31, so that the image light 31 penetrating the first beam splitter 20 sequentially penetrates the second beam splitter 40 and The quarter wave plate 80 is further reflected by the mirror 50 to penetrate the image light 31 of the second beam splitter 40 and the quarter wave plate 80. The second dichroic mirror 40 can be, for example, a polarization beam splitter.

When the image light rays 31 penetrating the first beam splitter 20 sequentially penetrate the second beam splitter 40 and the quarter wave plate 80, the image light rays 31 may be, for example, circularly polarized light. The mirror 50 can be, for example, a concave mirror.

Then, after the mirror 50 reflects the image light 31, the reflected image light 32 penetrates the quarter wave plate 80 again, so that the polarization direction of the image light 32 is compared with the polarization of the image light 31 projected by the display element 30. The direction is rotated by 90 degrees, and the image light 32 is reflected by the second beam splitter 40 to the user's eye 60. The polarization direction of the image light 31 and the polarization direction of the reflected image light 32 may be, for example, orthogonal.

In other words, the zoom element 70 is detachably or rotatably disposed on one side of the second beam splitter 40 to adjust the effective focal length of the virtual display zoom lens, thereby adjusting the user's eye 60 to view it. The magnification of the virtual image. However, the configuration of the zoom element 70 of the present invention is not limited to the configuration of the first embodiment, and the zoom element 70 may be disposed between the first beam splitter 20 and the second beam splitter 40. The zoom element 70 can be selected, for example, from a group consisting of a positive lens and a negative lens, that is, the zoom element 70 can be, for example, a positive lens, a negative lens, or a combination of positive and negative lenses.

Please refer to FIG. 1 and FIG. 2 . FIG. 2 is a schematic diagram of a rotatable replacement zoom lens according to a first embodiment of the virtual display zoom lens of the present invention.

Taking the rotatable replacement type zoom element 70 as an example, the zoom element 70 is, for example, a turntable including a positive lens 71, a negative lens 72, and a combination of positive and negative lenses 73. When the user wants to adjust the effective focal length of the virtual display zoom lens, the image light 32 penetrating the second beam splitter 40 can be selectively penetrated through the positive lens 71 and the negative lens, for example, by rotating the zoom element 70. 72 or a combination of positive and negative lenses 73 to adjust the magnification of the virtual image viewed by the user's eyes 60 in accordance with the needs of the user. However, the present invention is not limited thereto. The zoom element 70 of the present invention may further comprise a plurality of positive lenses 71 of different focal lengths, a plurality of negative lenses 72 of different focal lengths, and a combination 73 of positive and negative lenses of different focal lengths.

In addition, taking the removable zoom element 70 as an example, the zoom element 70 is, for example, a disk body (not shown) that can selectively insert a positive lens 71, a negative lens 72, or a combination of positive and negative lenses 73 according to actual needs. And whether it is a removable or rotatable replacement type zoom element 70, as long as the effective focal length of the virtual display zoom lens can be adjusted by replacing the zoom element 70, it should be within the scope of the claimed invention. .

Please refer to FIG. 3, which is a schematic diagram of a second embodiment of the virtual display zoom lens of the present invention. The second embodiment differs from the first embodiment only in the zoom element 70. Therefore, in the second embodiment, only the zoom element will be described, and the remaining elements will not be described again.

In the second embodiment, the zoom element may be, for example, a liquid crystal lens 74 and may be disposed, for example, on one side of the second beam splitter 40 to adjust the effective focal length of the virtual display zoom lens, thereby adjusting the eyes of the user. The magnification of 60 virtual images viewed.

When the image light 32 that penetrates the second beam splitter 40 penetrates the liquid crystal lens 74, the angle of the image light 32 can be changed by applying a different voltage to the liquid crystal lens 74 to rotate the liquid crystal in the liquid crystal lens 74, thereby The user's needs adjust the effective focal length of the virtual display zoom lens to adjust the magnification of the virtual image viewed by the user's eyes 60.

The above is intended to be illustrative only and not limiting. Anything that does not deviate from the invention God and the scope, and equivalent modifications or changes to them, shall be included in the scope of the patent application attached.

10‧‧‧Light source

11‧‧‧Light

20‧‧‧First Beamsplitter

30‧‧‧Display components

31, 32‧‧‧ image light

40‧‧‧Second beam splitter

50‧‧‧Mirror

60‧‧‧User's eyes

70‧‧‧Zoom components

Claims (8)

A virtual display zoom lens comprising: a first beam splitter disposed on a light path of a light source for reflecting the light; a display element receiving the light reflected by the first beam splitter Projecting an image light to penetrate the first beam splitter; a second beam splitter is disposed on the transmission path of the image light, so that the image light penetrating the first beam splitter penetrates the second beam splitter a mirror disposed on the transmission path of the image light to reflect the image light that penetrates the second beam splitter such that the image light is reflected by the second beam splitter to a user's eye; a zooming element is disposed on one side of the second beam splitter to adjust an effective focal length of the virtual display zoom lens, thereby adjusting a magnification of the virtual image viewed by the eye of the user; The zoom element is selected from the group consisting of a positive lens and a negative lens. The virtual display zoom lens of claim 1, wherein the display element is a liquid crystal on silicon (LCoS) display element. The virtual display zoom lens according to claim 1, further comprising a quarter wave plate (Quarter Wavelength Plate) disposed between the first beam splitter and the display element. The virtual display zoom lens of claim 1, wherein the mirror It is a Concave Mirror. A virtual display zoom lens comprising: a first beam splitter disposed on a light path of a light source for reflecting the light; a display element receiving the light reflected by the first beam splitter Projecting an image light to penetrate the first beam splitter; a second beam splitter is disposed on the transmission path of the image light, so that the image light penetrating the first beam splitter penetrates the second beam splitter a mirror disposed on the transmission path of the image light to reflect the image light that penetrates the second beam splitter such that the image light is reflected by the second beam splitter to a user's eye; a zoom component is disposed on one side of the second beam splitter to adjust an effective focal length of the virtual display zoom lens, thereby adjusting a magnification of the virtual image viewed by the eye of the user; wherein the zoom component It is a liquid crystal lens (Liquid Crystal Lens). The virtual display zoom lens of claim 5, wherein the display element is a liquid crystal on silicon (LCoS) display element. The virtual display zoom lens according to claim 5, further comprising a quarter wave plate (Quarter Wavelength Plate) disposed between the first beam splitter and the display element. The virtual display zoom lens of claim 5, wherein the mirror is a concave mirror (Concave Mirror).