head-mounted display

Abstract

The present invention provides a head-mounted display comprising two display units. The angle between the two display units is greater than 0 degrees and less than 180 degrees. Each of the two display units comprises a display device, a condenser lens, and a prism. The condenser lens overlaps the display device. The prism overlaps the condenser lens and the display device. One of the condenser lens and the prism is made of flint glass, and the other of the condenser lens and the prism is made of crown glass.

Description

Technical Field

[0001] The present invention relates to a display, and in particular to a head-mounted display. Background Art

[0002] Head-mounted displays (HMDs) typically use eye masks or helmets to position the display device in front of the user's eyes. Lenses project the image light from the display device into the user's eyes. While existing HMDs have improved image quality, color separation in the direct viewing area remains a challenge. Summary of the Invention

[0003] The invention provides a head-mounted display with good imaging quality.

[0004] According to an embodiment of the present invention, a head-mounted display includes two display units. The angle between the two display units is greater than 0 degrees and less than 180 degrees. Each of the two display units includes a display device, a condenser lens, and a prism. The condenser lens overlaps the display device. The prism overlaps the condenser lens and the display device. One of the condenser lens and the prism is made of flint glass, and the other of the condenser lens and the prism is made of crown glass.

[0005] In an embodiment according to the present invention, each of the two display units includes a plurality of condenser lenses.

[0006] In an embodiment according to the present invention, the prism is located between the plurality of condensing lenses and the display device.

[0007] In an embodiment according to the present invention, the prism is located between the plurality of condenser lenses.

[0008] In an embodiment according to the present invention, a plurality of condensing lenses are located between the prism and the display device.

[0009] In an embodiment according to the present invention, a prism has a first surface, a second surface, and a third surface. The second surface is opposite the first surface and is located between the first surface and the display device. The third surface connects the first and second surfaces on an inner side near the head-mounted display. The first and second surfaces have a first angle formed between them on an outer side near the head-mounted display. The second and third surfaces have a second angle formed between them on an inner side near the head-mounted display. The first angle is smaller than the second angle.

[0010] In an embodiment according to the present invention, the first angle is greater than 0 degree and less than or equal to 60 degrees.

[0011] In an embodiment according to the present invention, the prism includes a plurality of prismatic columns arranged from the inside to the outside of the head-mounted display. Each of the plurality of prismatic columns has a fourth surface, a fifth surface, and a sixth surface. The fifth surface is opposite the fourth surface and located between the fourth surface and the display device. The sixth surface connects the fourth and fifth surfaces. A third angle is formed between the fourth and fifth surfaces. A fourth angle is formed between the fifth and sixth surfaces. The third angle is smaller than the fourth angle.

[0012] In an embodiment of the present invention, the prism includes at least one curved surface.

[0013] In an embodiment of the present invention, each of the two display units further includes a diffraction element, which overlaps the condenser lens, the display device, and the prism.

[0014] Based on the above, in an embodiment of the present invention, the field of view of the head-mounted display is expanded by designing two display units arranged diagonally, and chromatic aberration is eliminated by combining the materials of the focusing lens and prism. As a result, the head-mounted display can have a large field of view and good imaging quality.

[0015] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present invention and together with the description serve to explain the principles of the present invention.

[0017] Figures 1 to 4 4 and 5 are schematic diagrams of head mounted displays according to embodiments of the present invention.

[0018] Explanation of Figure Numbers

[0019] 1. 1A, 1B, 1C: head-mounted display;

[0020] 10, 10A, 10B, 10C: display unit;

[0021] 100: display device;

[0022] 101: focusing lens;

[0023] 102, 102A, 102B, 102C: prism;

[0024] 103: diffraction element;

[0025] 1020: Prism;

[0026] D1: horizontal direction;

[0027] D2: normal direction;

[0028] E: Eye;

[0029] R: the area where the eyes are looking directly;

[0030] S: surface;

[0031] S1: first surface;

[0032] S2: second surface;

[0033] S3: third surface;

[0034] S4: fourth surface;

[0035] S5: fifth surface;

[0036] S6: sixth surface;

[0037] SI: inner surface;

[0038] SO: external surface;

[0039] X1: lateral;

[0040] X2: medial;

[0041] θ: angle;

[0042] θ1: first angle;

[0043] θ2: second angle;

[0044] θ3: the third angle;

[0045] θ4: the fourth angle. DETAILED DESCRIPTION

[0046] The directional terms mentioned herein, such as "up," "down," "front," "back," "left," "right," etc., are merely references to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0047] In the accompanying drawings, each figure illustrates the general characteristics of the methods, structures, and / or materials used in a particular embodiment. However, these figures should not be interpreted as defining or limiting the scope or nature of the embodiments. For example, the relative size, thickness, and position of various layers, regions, or structures may be reduced or exaggerated for clarity.

[0048] In the following embodiments, identical or similar elements will be denoted by identical or similar reference numerals, and redundant descriptions will be omitted. Furthermore, features from different embodiments may be combined unless there is a conflict, and simple equivalent variations and modifications made according to this specification or claims are still within the scope of the present invention.

[0049] The terms "first," "second," and the like mentioned in this specification or claims are used only to name discrete elements or to distinguish between different embodiments or scopes, and are not intended to limit the upper or lower limit on the number of elements, nor to define the order in which the elements are manufactured or disposed. Furthermore, "one element / film layer disposed on (or over) another element / film layer" may encompass situations where the element / film layer is directly disposed on (or over) the other element / film layer, with the two elements / film layers in direct contact; and situations where the element / film layer is indirectly disposed on (or over) the other element / film layer, with one or more elements / film layers interposed between the two elements / film layers.

[0050] Figures 1 to 4 are schematic diagrams of head mounted displays according to embodiments of the present invention. Figures 1 to 4 In addition to the head-mounted display, the user's eyes are also schematically shown to facilitate understanding of the relative relationship between the head-mounted display and the user. Figures 1 to 4 In any embodiment of the present invention, the application scope of the head-mounted display may include, but is not limited to, virtual reality (VR).

[0051] Please refer to Figure 1 , the head-mounted display 1 includes two display units 10. The two display units 10 are respectively arranged in front of the user's two eyes E. There is an angle θ between the two display units 10. The angle θ may be the angle between the two inner surfaces SI of the two display units 10. Alternatively, the angle θ may be the angle between the two outer surfaces SO of the two display units 10. An angle θ equal to 180 degrees indicates that the two display units 10 are arranged side by side in front of the user's two eyes E. In this embodiment, the angle θ between the two display units 10 is greater than 0 degrees and less than 180 degrees. In other words, the two display units 10 are arranged obliquely in front of the user's two eyes E. Through this design, the field of view of the head-mounted display 1 in the horizontal direction D1 can be improved, that is, the imaging range of the image in the horizontal direction D1 can be expanded.

[0052] Each of the two display units 10 includes a display device 100, a condenser lens 101, and a prism 102. The display device 100, the condenser lens 101, and the prism 102 are arranged in a normal direction D2 of the display device 100 and overlap each other in the normal direction D2.

[0053] In this embodiment, each of the two display units 10 includes a plurality of (e.g., two) condenser lenses 101, and the display device 100, the prism 102, and the plurality of condenser lenses 101 are arranged in sequence along the normal direction D2. In other words, the prism 102 is located between the plurality of condenser lenses 101 and the display device 100. However, the number of elements in the display unit 10 or the arrangement order of the plurality of elements may be changed as needed. In one embodiment, each of the two display units 10 may include one or more condenser lenses 101. In one embodiment, the prism 102 may be located between the plurality of condenser lenses 101. In one embodiment, the plurality of condenser lenses 101 may be located between the prism 102 and the display device 100. The following embodiments may all be changed in the same manner and will not be repeated below.

[0054] The outer surface SO of the display unit 10 may be defined as the surface of the element of the display device 100, the condenser lens 101, and the prism 102 that is farthest from one eye E of the user and that faces away from the eye E, and the inner surface SI of the display unit 10 may be defined as the surface of the element of the display device 100, the condenser lens 101, and the prism 102 that is closest to one eye E of the user and that faces the eye E. Figure 1 In the configuration shown in FIG. 1 , the outer surface SO of the display unit 100 is the surface of the display device 100 facing away from the prism 102, and the inner surface SI of the display unit 100 is the surface of the condenser lens 101 closer to the user's eye E, of the two condenser lenses 101, facing that eye E. When the arrangement order of the multiple components in the display unit 10 changes, the inner surface SI of the display unit 10 changes accordingly. For example, when the multiple condenser lenses 101 are located between the prism 102 and the display device 100, the inner surface SI of the display unit 10 is the surface of the prism 102 facing the user's eye E.

[0055] The display device 100 is adapted to provide image light with image information (eg, grayscale, color, etc.). For example, the display device 100 may be a liquid crystal display, but is not limited thereto.

[0056] The condenser lens 101 and the prism 102 are stacked between the display device 100 and one eye E of the user, and the condenser lens 101 and the prism 102 are adapted to transmit the image light outputted from the display device 100 to the eye E of the user.

[0057] One of the focusing lens 101 and the prism 102 is made of flint glass, while the other is made of crown glass. Flint glass has a high refractive index and a low Abbe number. Crown glass has a low refractive index and a high Abbe number. The dispersion effects of the two glasses compensate for each other, thereby achieving achromatic aberration and improving image quality.

[0058] exist Figures 1 to 4 In the embodiment of the present invention, each focusing lens 101 is schematically depicted as a flat plate. However, the number of focusing lenses 101 included in each display unit 10 and the optical parameter design of each focusing lens 101 (such as curvature, refractive index, distance between other elements, etc.) can be changed according to design requirements. Specifically, each display unit 10 may include one or more focusing lenses 101. When the display unit 10 includes multiple focusing lenses 101, the multiple focusing lenses 101 may have the same or different optical parameter designs. In addition, the two display units 10 arranged in front of the two eyes E may have equal or unequal numbers of focusing lenses 101, and the equal or unequal numbers of focusing lenses 101 may have the same or different optical parameter designs.

[0059] exist Figure 1 In the figure, the prism 102 has a first surface S1, a second surface S2, and a third surface S3. The second surface S2 is opposite to the first surface S1 and is located between the first surface S1 and the display device 100. The third surface S3 connects the first surface S1 and the second surface S2 at the inner side X2 near the head-mounted display 1. The first surface S1 and the second surface S2 have a first angle θ1 at the outer side X1 near the head-mounted display 1. The second surface S2 and the third surface S3 have a second angle θ2 at the inner side X2 near the head-mounted display 1. The first angle θ1 is smaller than the second angle θ2. For example, the first angle θ1 and the second angle θ2 can both be acute angles. Alternatively, the first angle θ1 can be an acute angle, and the second angle θ2 can be a right angle or an obtuse angle. By designing the acute angle to point toward the outer side X1 of the head-mounted display 1, chromatic aberration in areas where the eyes tend to focus (including the direct viewing area R) can be effectively eliminated.

[0060] In one embodiment, the first angle θ1 is greater than 0 degrees and less than or equal to 60 degrees, which can provide better image quality and facilitate the thinning and lightweighting of the head-mounted display 1. In another embodiment, the first angle θ1 is greater than or equal to 20 degrees and less than or equal to 30 degrees, which can further improve image quality and the thinning and lightweighting effect. The angle range of the second angle θ2 can be changed as needed and is not limited here.

[0061] In this embodiment, the prism 102 is a hexahedron, and the prism 102 further includes a surface S opposite to the third surface S3, a top surface (not shown), and a bottom surface (not shown). Each surface of the hexahedron is, for example, a plane. However, the total number of surfaces of the prism 102 or the curved surface design of each surface (such as a plane, a spherical surface, an aspherical surface, a curvature radius, etc.) can be changed as needed, without being limited to a fixed surface. Figure 1 Shown are limited.

[0062] Please refer to Figure 2 , head mounted display 1A and Figure 1 The main differences of the head-mounted display 1 are as follows. In each display unit 10A of the head-mounted display 1A, the prism 102A includes a plurality of prism columns 1020 arranged from the inner side X2 of the head-mounted display 1A to the outer side X1 of the head-mounted display 1A. The plurality of prism columns 1020 are connected to each other and extend in the direction of incidence on the paper surface, for example.

[0063] Each of the multiple prism columns 1020 has a fourth surface S4, a fifth surface S5, and a sixth surface S6. The fifth surface S5 is opposite the fourth surface S4 and is located between the fourth surface S4 and the display device 100. The sixth surface S6 connects the fourth surface S4 and the fifth surface S5. A third angle θ3 is defined between the fourth surface S4 and the fifth surface S5. A fourth angle θ4 is defined between the fifth surface S5 and the sixth surface S6. The third angle θ3 is less than the fourth angle θ4. The third angle θ3 and the fourth angle θ4 can both be acute angles. Alternatively, the third angle θ3 can be acute, and the fourth angle θ4 can be a right angle or an obtuse angle. By designing the acute angles toward the outer side X1 of the head-mounted display 1A, chromatic aberration in areas of the head-mounted display that the eye typically focuses on (including the direct viewing area R) can be effectively eliminated. Furthermore, the design of the multiple prism columns 1020 can effectively reduce the thickness of the head-mounted display 1A in the normal direction D2 and the overall weight of the head-mounted display 1A.

[0064] In one embodiment, the third angle θ3 is greater than 0 degrees and less than or equal to 60 degrees, which can provide better image quality and facilitate thinning and lightweighting of the head-mounted display 1A. In another embodiment, the third angle θ3 is greater than or equal to 20 degrees and less than or equal to 30 degrees, which can further improve image quality and lightweighting. The range of the fourth angle θ4 can be varied as needed and is not limited here.

[0065] Please refer to Figure 3 , head mounted display 1B and Figure 1 The main differences of the head-mounted display 1 are as follows. In each display unit 10B of the head-mounted display 1B, the prism 102B includes at least one curved surface. Figure 3In the embodiment, the first surface S1 is a curved surface convex toward the user's eye E, and the second surface S2 is a flat surface. However, the optical parameter design of each surface of the prism 102B and the angle between adjacent surfaces can be changed as needed. In one embodiment, the first surface S1 can be a curved surface concave into the interior of the prism 102B, and the second surface S2 can be a curved surface convex toward the display device 100. In one embodiment, the first surface S1 can be a curved surface convex toward the user's eye E, and the second surface S2 can be a curved surface convex toward the display device 100. In one embodiment, the prism 102B can be a cemented lens assembly.

[0066] The curved surface design of the prism 102B not only deflects the optical path and compensates for chromatic aberration, but also provides a light-focusing effect, thereby helping to reduce the thickness of the head-mounted display 1B in the normal direction D2. Furthermore, because the curved surface of the prism 102B shares some of the light-focusing effect, the amount of light-focusing required of the condenser lens 101 is reduced, thereby reducing the manufacturing difficulty of the condenser lens 101.

[0067] Please refer to Figure 4 , head mounted display 1C and Figure 1 The main differences of the head-mounted display 1 are as follows. In each display unit 10C of the head-mounted display 1C, the prism 102C is a pentahedron. Specifically, the prism 102C has a first surface S1 to a third surface S3, a top surface (not shown), and a bottom surface (not shown). Each surface of the pentahedron is, for example, a plane. However, the total number of surfaces of the prism 102C or the curved surface design of each surface can be changed according to needs, without being limited to the number of surfaces. Figure 4 Shown are limited.

[0068] In the head-mounted display 1C, each of the two display units 10C further includes a diffractive optical element (DOE) 103 to assist in eliminating chromatic aberration. The diffraction element 103 overlaps the focusing lens 101, the display device 100, and the prism 102C in the normal direction D2. The diffraction element 103 can be first formed on a substrate (such as glass; not shown) and then disposed at any position between the display device 100 and one eye E of the user. Alternatively, the diffraction element 103 can be first formed on a film (not shown) and then attached to at least one surface between the display device 100 and one eye E of the user. Alternatively, the diffraction element 103 can be directly formed on at least one surface between the display device 100 and one eye E of the user.

[0069] In summary, in an embodiment of the present invention, the field of view of a head-mounted display is expanded by designing two display units arranged diagonally, and chromatic aberration is eliminated by combining the materials of a focusing lens and a prism. Therefore, the head-mounted display can have a large field of view and good imaging quality. In one embodiment, the acute angles of the prisms can be directed outward from the head-mounted display to effectively eliminate chromatic aberration in areas of the head that the eye typically focuses on (including the area of ​​direct vision). In one embodiment, the angular range of the prisms can be designed to improve imaging quality and achieve a thinner and lighter head-mounted display. In one embodiment, the thickness of the head-mounted display in the normal direction of the display device and the overall weight of the head-mounted display can be effectively reduced by designing multiple prism columns. In one embodiment, the curved surface design of the prisms can provide a focusing effect, thereby helping to reduce the thickness of the head-mounted display in the normal direction of the display device or facilitating the manufacture of the focusing lens. In one embodiment, the provision of a diffraction element can assist in eliminating chromatic aberration.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A head-mounted display, characterized in that: include: Two display units, wherein the angle between the two display units is greater than 0 degrees and less than 180 degrees, and each of the two display units comprises: display device; a condenser lens, overlapping the display device; and a prism overlapping the condenser lens and the display device, wherein the material of one of the condenser lens and the prism includes flint glass, and the material of the other of the condenser lens and the prism includes crown glass, The prism has a first surface, a second surface and a third surface, the second surface is opposite to the first surface and is located between the first surface and the display device, the third surface connects the first surface and the second surface on the inner side near the head-mounted display, the first surface and the second surface have a first angle on the outer side near the head-mounted display, the second surface and the third surface have a second angle on the inner side near the head-mounted display, and the first angle is smaller than the second angle.

2. The head-mounted display according to claim 1, wherein The first angle is greater than 0 degrees and less than or equal to 60 degrees.

3. A head-mounted display, characterized in that: include: Two display units, wherein the angle between the two display units is greater than 0 degrees and less than 180 degrees, and each of the two display units comprises: display device; a condenser lens, overlapping the display device; and a prism overlapping the condenser lens and the display device, wherein the material of one of the condenser lens and the prism includes flint glass, and the material of the other of the condenser lens and the prism includes crown glass, The prism includes a plurality of prism columns arranged from the inner side of the head-mounted display to the outer side of the head-mounted display, each of the plurality of prism columns has a fourth surface, a fifth surface and a sixth surface. In each of the plurality of prism columns, the fifth surface is opposite to the fourth surface and is located between the fourth surface and the display device, and the sixth surface connects the fourth surface and the fifth surface near the inner side of the head-mounted display. There is a third angle between the fourth surface and the fifth surface, and there is a fourth angle between the fifth surface and the sixth surface, and the third angle is smaller than the fourth angle.

4. The head-mounted display according to claim 1 or 3, wherein: Each of the two display units includes a plurality of the condenser lenses.

5. The head-mounted display according to claim 4, wherein: The prism is located between the plurality of condensing lenses and the display device.

6. The head-mounted display according to claim 4, wherein: The prism is located between the plurality of condensing lenses.

7. The head-mounted display according to claim 4, wherein: The plurality of condensing lenses are located between the prism and the display device.

8. The head-mounted display according to claim 1 or 3, wherein: The prism includes at least one curved surface.

9. The head-mounted display according to claim 1 or 3, wherein: Each of the two display units further includes: A diffraction element is overlapped with the condenser lens, the display device and the prism.

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