Head-mounted display

Abstract

A head-mounted display (90) comprises a frame (91) and a transparent display device (95) attached to the frame (91). The display device (95) comprises: a first base material (96); a wiring board (10) provided on the first base material (96); and a display unit (97) provided between the first base material (96) and the wiring board (10). The wiring board (10) comprises: a transparent substrate (11); and a wiring pattern region (20) that is disposed on the substrate (11) and includes a plurality of wirings (21).

Description

[Technical Field]

[0001] Embodiments of this disclosure relate to head-mounted displays. [Background technology]

[0002] Currently, transparent head-mounted displays are under development (see, for example, Patent Document 1). A transparent head-mounted display is a device that displays various information added to the real-world scenery seen by the wearer, using a technology such as Augmented Reality (AR). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2015-191026

[0004] Incidentally, head-mounted displays may be equipped with antennas and other devices for communicating with external communication equipment in order to obtain various types of information. This can increase the weight of the head-mounted display, and there is a demand for miniaturization and weight reduction. Furthermore, when antennas and other devices are installed in a head-mounted display, there is a need to improve radio wave sensitivity.

[0005] One of the objectives of this embodiment is to provide a head-mounted display that is miniaturized and lightweight, while also improving radio wave sensitivity. [Disclosure of the Invention]

[0006] A head-mounted display according to one embodiment of the present disclosure comprises a frame and a transparent display device attached to the frame, wherein the display device has a first substrate, a wiring board provided on the first substrate, and a display unit provided between the first substrate and the wiring board, and the wiring board includes a transparent substrate and a wiring pattern area disposed on the substrate and including a plurality of wirings, the head-mounted display.

[0007] In a head-mounted display according to one embodiment of the present disclosure, the display device may further include a second substrate provided on the wiring board and sandwiching the wiring board together with the first substrate.

[0008] In a head-mounted display according to one embodiment of the present disclosure, the wiring pattern area and the display unit may be offset from each other when viewed along the thickness direction of the substrate.

[0009] In a head-mounted display according to one embodiment of the present disclosure, the wiring pattern area may be located closer to the frame than the display unit.

[0010] In a head-mounted display according to one embodiment of the present disclosure, the wiring pattern area may have at least one of the following functions: radio wave transmission / reception function, gesture sensing function, wireless power supply function, and anti-fogging function.

[0011] In a head-mounted display according to one embodiment of the present disclosure, there may be multiple wiring pattern regions on the substrate, and each of the wiring pattern regions may have a different function.

[0012] In a head-mounted display according to one embodiment of the present disclosure, the plurality of wirings may be arranged irregularly in some respects.

[0013] In a head-mounted display according to an embodiment of the present disclosure, the substrate may include glass or a resin film.

[0014] In a head-mounted display according to an embodiment of the present disclosure, the wiring substrate may be disposed around the wiring pattern region and may further include a dummy pattern region that is electrically independent from the wiring.

[0015] In a head-mounted display according to an embodiment of the present disclosure, the wiring pattern region may have a sheet resistance value of 5 Ω / □ or less, and the longest width when each wiring is viewed at a viewing angle of 120° may be 3 μm or less.

[0016] According to an embodiment of the present disclosure, it is possible to reduce the size and weight of the head-mounted display and improve the radio wave sensitivity.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a perspective view showing a head-mounted display according to an embodiment. [Figure 2] FIG. 2 is a front view (viewed in the direction of arrow II in FIG. 1) showing a head-mounted display according to an embodiment. [Figure 3] FIG. 3 is a cross-sectional view (cross-section taken along line III-III in FIG. 2) showing a display device of a head-mounted display according to an embodiment. [Figure 4] FIG. 4 is an enlarged plan view (enlarged view of part IV in FIG. 2) showing a wiring substrate. [Figure 5] FIG. 5 is an enlarged plan view (enlarged view of part V in FIG. 4) showing a wiring substrate. [Figure 6] FIG. 6 is a cross-sectional view (cross-section taken along line VI-VI in FIG. 5) showing a wiring substrate. [Figure 7] FIG. 7 is a cross-sectional view (cross-section taken along line VII-VII in FIG. 5) showing a wiring substrate. [Figure 8] FIG. 8 is a cross-sectional view showing antenna wiring and antenna connection wiring of a wiring substrate. [Figure 9] Figure 9 is a graph showing the results of a simulation of the relationship between sheet resistance and radiation efficiency. [Figure 10] Figure 10 is a perspective view showing the antenna pattern area of ​​a wiring board. [Figure 11] Figure 11 is a cross-sectional view showing the antenna wiring and antenna connection wiring on a circuit board. [Figure 12] Figure 12 is a cross-sectional view of the wiring board (cross-sectional view along line XII-XII in Figure 5). [Figure 13A] Figure 13A is a cross-sectional view showing a method for manufacturing a wiring board for a head-mounted display according to one embodiment. [Figure 13B] Figure 13B is a cross-sectional view showing a method for manufacturing a wiring board for a head-mounted display according to one embodiment. [Figure 13C] Figure 13C is a cross-sectional view showing a method for manufacturing a wiring board for a head-mounted display according to one embodiment. [Figure 13D] Figure 13D is a cross-sectional view showing a method for manufacturing a wiring board for a head-mounted display according to one embodiment. [Figure 13E] Figure 13E is a cross-sectional view showing a method for manufacturing a wiring board for a head-mounted display according to one embodiment. [Figure 13F] Figure 13F is a cross-sectional view showing a method for manufacturing a wiring board for a head-mounted display according to one embodiment. [Figure 14] Figure 14 is a cross-sectional view (corresponding to Figure 3) showing a modified example of a head-mounted display according to one embodiment. [Figure 15] Figure 15 is a front view (corresponding to Figure 2) showing a modified example of a head-mounted display according to one embodiment. [Figure 16] Figure 16 is an enlarged plan view (corresponding to Figure 5) showing a modified example of a head-mounted display according to one embodiment. [Figure 17] Figure 17 is a front view (corresponding to Figure 2) showing a modified example of a head-mounted display according to one embodiment. [Figure 18] Figure 18 is a front view (corresponding to Figure 2) showing a modified example of a head-mounted display according to one embodiment. [Modes for carrying out the invention]

[0018] First, an embodiment will be described with reference to Figures 1 to 13F. Figures 1 to 13F are diagrams illustrating this embodiment.

[0019] The following figures are schematic representations. Therefore, the size and shape of each part are exaggerated as appropriate for ease of understanding. Furthermore, they can be modified as appropriate without departing from the technical concept. In the following figures, the same parts are denoted by the same reference numerals, and some detailed explanations may be omitted. Also, the numerical values ​​such as dimensions and material names of each component described in this specification are examples of embodiments and are not limited to them; they can be selected and used as appropriate. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and perpendicular, are interpreted to include not only their strict meaning but also substantially equivalent states.

[0020] In this embodiment, "X direction" refers to the direction parallel to one side of the substrate. "Y direction" refers to the direction perpendicular to the X direction and parallel to the other side of the substrate. "Z direction" refers to the direction perpendicular to both the X and Y directions and parallel to the thickness direction of the wiring board. Furthermore, "front surface" refers to the surface on the positive Z side of the substrate, on which the antenna wiring is provided. "Back surface" refers to the surface on the negative Z side of the substrate, on the side opposite to the surface on which the antenna wiring is provided. In this embodiment, the case where the wiring pattern area 20 is an antenna pattern area 20 having a radio wave transmission and reception function (function as an antenna) is described as an example, but the wiring pattern area 20 does not necessarily have to have a radio wave transmission and reception function (function as an antenna).

[0021] [Head-mounted display configuration] Referring to Figures 1 to 12, the configuration of the head-mounted display (hereinafter simply referred to as HMD) according to this embodiment will be described. The HMD according to this embodiment is a see-through type HMD.

[0022] As shown in Figure 1, the HMD 90 according to this embodiment comprises a frame 91 and a transparent display device 95 attached to the frame 91. In this embodiment, the HMD 90 is equipped with a display device 95 for the right eye and a display device 95 for the left eye, and is a so-called glasses-type HMD. The display device 95 for the right eye and the display device 95 for the left eye have substantially the same structure. Furthermore, each display device 95 is synchronized with each other and is configured to display the same image on the left and right eyes or corresponding images on the left and right eyes. In addition, the two display devices 95 may be individually controllable, and the two display devices 95 may display different images from each other. The HMD 90 may also be a so-called goggle-type HMD equipped with a single display device 95.

[0023] The frame 91 of the HMD90 has a rim 92 and a pair of temples 93 connected to the rim 92. Each display device 95 is fitted into the rim 92. In this embodiment, the wireless communication circuit 94a of the HMD90 is provided on the rim 92.

[0024] Furthermore, each pair of temples 93 is provided with a control unit 94b for controlling each display device 95. This control unit 94b may include an image display unit (not shown) that generates image light. In this embodiment, one control unit 94b is provided on each temple 93. The control unit 94b located on the right temple 93 controls the display device 95 for the right eye, and the control unit 94b located on the left temple 93 controls the display device 95 for the left eye.

[0025] Next, the display device 95 will be described. As shown in Figures 2 and 3, the display device 95 includes a first substrate 96, a wiring board 10 provided on the first substrate 96, and a display unit 97 provided between the first substrate 96 and the wiring board 10. In this embodiment, the wiring board 10 covers the entire area of ​​the first substrate 96. Although not shown in the figures, the wiring board 10 may cover only a part of the first substrate 96.

[0026] The material of the first substrate 96 can be any material that is transparent in the visible light region. For example, a glass substrate can be used as the first substrate 96. In this embodiment, when the HMD 90 is worn by the wearer, the first substrate 96 is positioned on the side farther from the wearer, and the wiring board 10 is positioned on the side closer to the wearer. That is, when the HMD 90 is worn by the wearer, the wiring board 10 is positioned between the first substrate 96 and the wearer. This prevents the wiring board 10 from coming into contact with surrounding structures or other people, even if the HMD 90 comes into contact with surrounding structures or other people when the wearer puts on the HMD 90. Therefore, it is possible to prevent the antenna wiring 21 of the antenna pattern region 20 of the wiring board 10 from being disconnected due to contact with surrounding structures or other people.

[0027] The display unit 97 includes a half-mirror. This half-mirror is a component that superimposes the ambient light in front of the display device 95 with the image light from the image display unit (not shown) that generates the image light. Furthermore, the display unit 97 is configured so that the display area of ​​the image is transparent when the image is not displayed, allowing the wearer to see the outside world through the light transmitted through the display unit 97. The wearer can then see the virtual image (image) formed by the image light while seeing the outside world. In the illustrated example, the display unit 97 is positioned to overlap approximately the center of the first substrate 96 when viewed from the front (see Figure 2). However, it is not limited to this, and the display unit 97 may be positioned to overlap any area of ​​the first substrate 96 when viewed from the front.

[0028] The display device 95 may be a display device that projects images using a prism or hologram, or it may be a display device that uses a transmissive liquid crystal display or the like.

[0029] [Wiring board configuration] Next, the configuration of the wiring board 10 of the display device 95 will be described with reference to Figures 4 to 12. Figures 4 to 12 are diagrams showing the wiring board 10.

[0030] As shown in Figure 4, the wiring board 10 comprises a transparent substrate 11 and an antenna pattern area (wiring pattern area) 20 arranged on the substrate 11. The power supply unit 40 is electrically connected to the antenna pattern area 20. The wiring board 10 also further comprises a dummy pattern area 30 arranged around the antenna pattern area 20 on the substrate 11. Here, we will first describe the substrate 11.

[0031] (substrate) The substrate 11 is substantially rectangular in shape when viewed from the front (a rectangle with rounded corners (see Figure 2)), with its longitudinal direction parallel to the X direction and its transverse direction parallel to the Y direction. The substrate 11 is transparent and substantially flat, and its thickness is substantially uniform throughout. The shape of the substrate 11 can be appropriately selected to match the shape of the first base material 96 of the display device 95 that is attached to the frame 91.

[0032] The material of the substrate 11 can be any material that has transparency in the visible light region and electrical insulation properties. For example, the substrate 11 may include glass or a resin film. In this embodiment, the material of the substrate 11 is polyethylene terephthalate, but it is not limited thereto. As the material of the substrate 11, it is preferable to use an organic insulating material such as a polyester resin such as polyethylene terephthalate, an acrylic resin such as polymethyl methacrylate, a polycarbonate resin, a polyimide resin, or a polyolefin resin such as cycloolefin polymer, or a cellulose resin material such as triacetylcellulose. In addition, ceramics and the like can be appropriately selected as the material of the substrate 11 depending on the application. Although the illustration shows an example in which the substrate 11 is composed of a single layer, it is not limited thereto, and it may be a structure in which multiple substrates or layers are laminated. Furthermore, the substrate 11 may be in the form of a film or a plate. For this reason, there is no particular limit to the thickness of the substrate 11, and it can be appropriately selected depending on the application, but as an example, the thickness T1 (length in the Z direction, see Figure 6) of the substrate 11 can be in the range of 10 μm to 200 μm.

[0033] Furthermore, the substrate 11 is transparent. In this specification, "transparent" means that the transmittance of visible light (light rays with wavelengths of 400 nm to 700 nm) is 85% or more. The substrate 11 may have a transmittance of visible light (light rays with wavelengths of 400 nm to 700 nm) of 85% or more, but it is preferable that it is 90% or more. There is no particular upper limit to the transmittance of visible light of the substrate 11, but it may be, for example, 100% or less. By setting the transmittance of visible light of the substrate 11 within the above range, it is possible to suppress interference with the visibility of the outside world when the wiring board 10 is incorporated into the HDM 90. Visible light refers to light rays with wavelengths of 400 nm to 700 nm. Furthermore, a visible light transmittance of 85% or higher means that when the absorbance of the substrate 11 is measured using a known spectrophotometer (for example, a spectrometer manufactured by JASCO Corporation: V-670), the transmittance is 85% or higher in the entire wavelength range from 400 nm to 700 nm.

[0034] (Antenna pattern area) Next, the antenna pattern region 20 will be described. In Figure 4, there are multiple (three) antenna pattern regions 20 on the substrate 11, each corresponding to a different frequency band. That is, the multiple antenna pattern regions 20 have a length (length in the Y direction) L a These elements are all different in length, and each has a length corresponding to a specific frequency band. The lower the corresponding frequency band, the longer the length L of the antenna pattern area 20. aThe length is increasing. If each antenna pattern area 20 has a radio wave transmission and reception function, each antenna pattern area 20 may correspond to one of the following: a telephone antenna, a WiFi antenna, a 3G antenna, a 4G antenna, an LTE antenna, a Bluetooth® antenna, an NFC antenna, etc. Alternatively, if each antenna pattern area 20 does not have a radio wave transmission and reception function, each antenna pattern area 20 may perform functions such as gesture sensing, wireless power supply, anti-fogging, heating, hovering (a function that allows operation without the user directly touching the display), fingerprint authentication, noise reduction (shielding), etc. Hereinafter, "gesture sensing function" means a function that detects the relative position (distance, angle, etc.) of an object with respect to the antenna pattern area 20, or the movement speed of the object.In this case, for example, the antenna pattern area 20 may perform the gesture sensing function by detecting millimeter waves.

[0035] Each antenna pattern region 20 is approximately rectangular in plan view. In the illustrated example, the longitudinal direction of each antenna pattern region 20 is parallel to the Y direction, and the transverse direction is parallel to the X direction. The length L of the longitudinal direction (Y direction) of each antenna pattern region 20. a For example, it can be selected within a range of 3 mm to 100 mm. The width W in the short direction (width direction) of each antenna pattern area 20. a This can be determined by considering, as described later, (i) the skin depth of the antenna wiring 21 and the antenna connecting wiring 22, (ii) the sheet resistance value of the antenna pattern area 20, and (iii) the viewing angle of the antenna wiring 21 and the antenna connecting wiring 22. Specifically, the width W of each antenna pattern area 20 a For example, it can be selected within a range of 1 mm to 25 mm.

[0036] Each antenna pattern region 20 is formed by metal wires arranged in a grid or mesh shape, and has a uniform repeating pattern in the X and Y directions. That is, as shown in Figure 5, the antenna pattern region 20 is composed of a repetition of an L-shaped unit pattern shape 20a (shaded area in Figure 5) which consists of a portion extending in the X direction (part of the antenna connecting wiring 22 described later) and a portion extending in the Y direction (part of the antenna wiring 21 described later).

[0037] As shown in Figure 5, each antenna pattern region 20 includes multiple antenna wires (wires) 21 that function as antennas, and multiple antenna connecting wires 22 that connect the multiple antenna wires 21. Specifically, the multiple antenna wires 21 and the multiple antenna connecting wires 22 together form a regular grid or mesh shape. Each antenna wire 21 extends in the direction corresponding to the antenna frequency band (Y direction), and each antenna connecting wire 22 extends in the direction perpendicular to the antenna wire 21 (X direction). The antenna wires 21 have a length L corresponding to a predetermined frequency band. a (Having the length of the antenna pattern region 20 described above), it primarily functions as an antenna. On the other hand, the antenna connecting wiring 22 connects these antenna wirings 21 to each other, thereby preventing problems such as the antenna wiring 21 being disconnected or the antenna wiring 21 losing electrical connection with the feed point 40.

[0038] In each antenna pattern region 20, multiple openings 23 are formed by being surrounded by adjacent antenna wirings 21 and adjacent antenna connecting wirings 22. The antenna wirings 21 and antenna connecting wirings 22 are arranged at equal intervals from each other. That is, the multiple antenna wirings 21 are arranged at equal intervals from each other in the width direction (X direction) of the antenna pattern region 20. The pitch P1 of the antenna wirings 21 can be determined by considering (i) the skin depth of the antenna wirings 21, (ii) the sheet resistance value of the antenna pattern region 20, and (iii) the viewing angle of the antenna wirings 21, as will be described later. Specifically, the pitch P1 of the antenna wirings 21 can be, for example, in the range of 0.01 mm to 1 mm. The pitch P1 of the antenna wirings 21 is uniform along the width direction (X direction) of the antenna pattern region 20, but it is not limited to this and may be non-uniform along the width direction (X direction).

[0039] Furthermore, the multiple antenna connecting wires 22 are arranged at equal intervals from each other in the longitudinal direction (Y direction) of the antenna pattern area 20. The pitch P2 of the antenna connecting wires 22 can be determined by considering (i) the skin depth of the antenna connecting wires 22, (ii) the sheet resistance value of the antenna pattern area 20, and (iii) the viewing angle of the antenna connecting wires 22, as will be described later. Specifically, the pitch P2 of the antenna connecting wires 22 can be in the range of 0.01 mm to 1 mm, for example.

[0040] As described above, the arrangement of multiple antenna wirings 21 and multiple antenna connecting wirings 22 at equal intervals eliminates variations in the size of the openings 23 within each antenna pattern area 20, making the antenna pattern area 20 difficult to see with the naked eye. Furthermore, the pitch P1 of the antenna wirings 21 is equal to the pitch P2 of the antenna connecting wirings 22. Therefore, each opening 23 is approximately square in plan view, and the transparent substrate 11 is exposed through each opening 23. Thus, by increasing the area of ​​each opening 23, the overall transparency of the wiring board 10 can be increased. The length L1 of one side of each opening 23 can be, for example, in the range of 0.01 mm to 1 mm. Although each antenna wiring 21 and each antenna connecting wiring 22 are orthogonal to each other, they are not limited to this and may intersect at acute or obtuse angles. Furthermore, while it is preferable for the shape and size of the openings 23 to be the same across the entire surface, they do not need to be uniform across the entire surface, for example, by varying them in different locations.

[0041] As shown in Figure 6, each antenna wiring 21 has a roughly rectangular or roughly square cross-section perpendicular to its longitudinal direction (cross-section in the X direction). In this case, the cross-sectional shape of the antenna wiring 21 is roughly uniform along its longitudinal direction (Y direction). Also, as shown in Figure 7, the shape of the cross-section perpendicular to the longitudinal direction (cross-section in the Y direction) of each antenna connecting wiring 22 is roughly rectangular or roughly square, and is roughly the same as the cross-sectional shape (cross-section in the X direction) of the antenna wiring 21 described above. In this case, the cross-sectional shape of the antenna connecting wiring 22 is roughly uniform along its longitudinal direction (X direction). The cross-sectional shapes of the antenna wiring 21 and antenna connecting wiring 22 do not necessarily have to be roughly rectangular or roughly square; for example, they may be roughly trapezoidal in shape, where the front side (positive Z direction side) is narrower than the back side (negative Z direction side), or they may have curved sides on both sides in the width direction.

[0042] In this embodiment, the line width W1 (length in the X direction, see Figure 6) and height H1 (length in the Z direction, see Figure 6) of the antenna wiring 21 can be determined by considering (i) the skin depth of the antenna wiring 21, (ii) the sheet resistance value of the antenna pattern area 20, and (iii) the viewing angle of the antenna wiring 21, as will be described later. For example, the line width W1 of the antenna wiring 21 can be selected in the range of 0.1 μm to 5.0 μm, and the height H1 of the antenna wiring 21 can be selected in the range of 0.1 μm to 5.0 μm.

[0043] Similarly, the line width W2 (length in the Y direction, see Figure 7) and height H2 (length in the Z direction, see Figure 7) of the antenna connection wiring 22 can be determined by considering (i) the skin depth of the antenna connection wiring 22, (ii) the sheet resistance value of the antenna pattern area 20, and (iii) the viewing angle of the antenna connection wiring 22, as will be described later. For example, the line width W2 of the antenna connection wiring 22 can be selected in the range of 0.1 μm to 5.0 μm, and the height H2 of the antenna connection wiring 22 can be selected in the range of 0.1 μm to 5.0 μm.

[0044] The materials for the antenna wiring 21 and the antenna connecting wiring 22 can be any conductive metallic material. In this embodiment, the materials for the antenna wiring 21 and the antenna connecting wiring 22 are copper, but are not limited to this. For example, the materials for the antenna wiring 21 and the antenna connecting wiring 22 can be metallic materials (including alloys) such as gold, silver, copper, platinum, tin, aluminum, iron, and nickel.

[0045] As described above, the mesh shape (dimensions) of the antenna wiring 21 and antenna connecting wiring 22 in the antenna pattern area 20 can be determined by considering (i) the skin depth of the antenna wiring 21 and antenna connecting wiring 22, (ii) the sheet resistance value of the antenna pattern area 20, and (iii) the viewing angle of the antenna wiring 21 and antenna connecting wiring 22. The following describes a method for determining such a mesh shape (dimensions) of the antenna pattern area 20.

[0046] (i) epidermal depth As described above, the length L (the length in the Y direction) of the antenna pattern region 20 a has a length corresponding to a specific frequency band, and the lower the corresponding frequency band, the longer the length L a becomes. After determining the length L of the antenna pattern region 20 a , the line widths W1, W2 and heights H1, H2 of the antenna wiring 21 and the antenna connection wiring 22 may be determined.

[0047] That is, the line widths W1, W2 and heights H1, H2 of the antenna wiring 21 and the antenna connection wiring 22 may be determined so as to have dimensions not affected by the skin effect according to the corresponding frequency bands, respectively. Specifically, in the cross section of the antenna wiring 21 and the antenna connection wiring 22, the shorter of the heights H1, H2 and the line widths W1, W2 may be set to be not more than twice the skin depth of each of the antenna wiring 21 and the antenna connection wiring 22.

[0048] Generally, when an alternating current flows through a wiring, the higher the frequency, the less current flows through the central part of the wiring, and the current flows on the surface of the wiring. Such a phenomenon that the current flows only on the surface when an alternating current flows through the wiring is called the skin effect. Also, the skin depth refers to the depth from the surface of the wiring at which the current decays to 1 / e (about 0.37) times the current on the surface of the wiring where the current flows most easily. This skin depth δ can generally be obtained by the following formula.

[0049]

Equation

[0050] In the above formula, ω is the angular frequency (= 2πf), μ is the permeability (4π×10 -7 [H / m] in a vacuum), σ is the conductivity of the conductor constituting the wiring (5.8×10 7This means [S / m]). The skin depth δ of copper wiring is approximately δ = 2.3 μm at a frequency of 0.8 GHz, approximately δ = 1.3 μm at a frequency of 2.4 GHz, approximately δ = 1.0 μm at a frequency of 4.4 GHz, and approximately δ = 0.85 μm at a frequency of 6 GHz.

[0051] In this embodiment, the shorter of the height H1 (H2) and line width W1 (W2) of the antenna wiring 21 (antenna connecting wiring 22) may be less than or equal to twice (2δ) the skin depth δ of the corresponding frequency. For example, as shown in Figure 8, when the line width W1 (W2) is shorter than the height H1 (H2) of the antenna wiring 21 (antenna connecting wiring 22) (W1

[0052] This makes it possible to pass current through almost the entire cross-section of the antenna wiring 21 (antenna connecting wiring 22). As a result, the antenna wiring 21 (antenna connecting wiring 22) can be used efficiently, and its cross-sectional area can be minimized. Consequently, it becomes possible to increase the aperture ratio A1 of the antenna pattern area 20, making the antenna pattern area 20 difficult to see with the naked eye.

[0053] (ii) Sheet resistance Furthermore, the sheet resistance of the antenna pattern region 20 may be 5Ω / □ or less. By setting the sheet resistance to 5Ω / □ or less, the performance of the antenna pattern region 20 can be maintained. Specifically, the radiation efficiency of the antenna pattern region 20 as an antenna (the ratio indicating how much of the power input to the antenna pattern region 20 is radiated) can be increased.

[0054] ​Figure 9 shows the simulation results of the relationship between sheet resistance and radiation efficiency when the frequency corresponding to the antenna pattern region 20 as an antenna is 2.4 GHz. As is clear from Figure 9, by setting the sheet resistance of the antenna pattern region 20 to 5 Ω / □ or less, the radiation efficiency of the antenna pattern region 20 alone becomes 75% or more, and its antenna characteristics can be maintained. Furthermore, even when the frequency corresponding to the antenna pattern region 20 is a frequency other than 2.4 GHz, good radiation efficiency can be maintained by setting the sheet resistance to 5 Ω / □ or less.

[0055] Here, the sheet resistance value (Ω / □) of the antenna pattern region 20 can be determined as follows: That is, the sheet resistance value (Ω / □) of both ends 20 in the longitudinal direction (Y direction) of the antenna pattern region 20 e1 , 20 e2 (See Figure 10) Measure the resistance R between the points. Next, measure this resistance R over the length L of the antenna pattern area 20. a and width W a Ratio to (L a / W a By dividing by ), the sheet resistance value R of the antenna pattern region 20 is obtained. s (Ω / □) can be calculated. That is, the sheet resistance value R s =R×W a / L a This is the result.

[0056] In this way, by setting the sheet resistance value of the antenna pattern region 20 to 5Ω / □ or less, the radiation efficiency of the antenna pattern region 20 alone can be set to 75% or more, thereby improving the performance of the antenna pattern region 20 as an antenna. Furthermore, within the range that satisfies the above sheet resistance value, the width W of the antenna pattern region 20 can be set. a Furthermore, the heights H1 and H2 can be kept to the minimum possible. This makes it possible to increase the aperture ratio A1 of the antenna pattern area 20, making the antenna pattern area 20 difficult to see.

[0057] (iii) Viewing angle Furthermore, in this embodiment, the maximum width of the antenna wiring 21 and the antenna connecting wiring 22 when viewed at a 120° field of view may be 3 μm or less.

[0058] That is, as shown in Figure 11, in a cross-section perpendicular to the longitudinal direction of the antenna wiring 21 (antenna connecting wiring 22), the antenna wiring 21 (antenna connecting wiring 22) is positioned along a predetermined line of sight L D Width W when viewed from this direction D This is defined. And this line of sight L D The width of the longest antenna wiring 21 (antenna connecting wiring 22) when the antenna is moved within a field of view of 120° may be 3 μm or less.

[0059] Here, the viewing angle is defined as the normal N perpendicular to the surface of the substrate 11. L And, normal N L The intersection O between the surface of the substrate 11 Z Gaze directed towards L D When the angle is θ, this refers to the angle that is 2 × θ. Also, the line of sight L D Width W when viewed from this direction D This refers to the line of sight L D A pair of straight lines L parallel to each other m , L n However, when the antenna wiring 21 (antenna connecting wiring 22) is in contact with the pair of straight lines L in a cross-sectional view, m , L n It refers to the distance between two things.

[0060] For example, if the height H1 (H2) of the antenna wiring 21 (antenna connecting wiring 22) and the line width W1 (W2) of the antenna wiring 21 (antenna connecting wiring 22) are the same (H1=W1 (H2=W2)), then the width when viewed at a 120° viewing angle is W D The maximum value occurs when θ = 45°, and that value is 1.41 × W1. Also, when the height H1 (H2) of the antenna wiring 21 (antenna connecting wiring 22) is twice the line width W1 (W2) of the antenna wiring 21 (antenna connecting wiring 22) (H1 = 2 × W1 (H2 = 2 × W2)), the width when viewed at a 120° field of view W DThe maximum value occurs when θ = 60°, and this value is 2.23 × W1.

[0061] Generally, when a user views the wiring board 10, their field of view is considered to be approximately 120° at most. Also, the maximum width of the antenna wiring 21 (antenna connecting wiring 22) that a human can see is approximately 3 μm. Therefore, by making the maximum width of the antenna wiring 21 (antenna connecting wiring 22) when viewed at a 120° field of view 3 μm or less, it is possible to make it difficult for the user to recognize the antenna wiring 21 (antenna connecting wiring 22) with the naked eye.

[0062] By the way, referring to Figure 2 again, in a front view of the HMD 90 (i.e., when viewed along the thickness direction of the substrate 11), the antenna pattern area 20 and the display unit 97 are offset from each other. In other words, the antenna pattern area 20 is positioned so as not to overlap with the display unit 97 in a front view of the HMD 90. This improves the visibility of the display unit 97. Furthermore, the offset arrangement of the antenna pattern area 20 and the display unit 97 in a front view of the HMD 90 enhances the antenna performance of the antenna pattern area 20. That is, the offset arrangement of the antenna pattern area 20 and the display unit 97 in a front view of the HMD 90 increases the distance between the antenna pattern area 20 and the conductor display unit 97. This suppresses adverse effects on radio wave transmission and reception. In this case, the shortest distance D between the antenna pattern area 20 and the display unit 97 is preferably 0.1 mm or more, and more preferably 0.2 mm or more. By setting the shortest distance D to 0.1 mm or more, the visibility of the display unit 97 can be further improved. Furthermore, adverse effects on radio wave transmission and reception can be effectively suppressed, and the performance of the antenna pattern area 20 as an antenna can be further enhanced. Additionally, by setting the shortest distance D to 0.2 mm or more, the visibility of the display unit 97 can be further improved. Furthermore, adverse effects on radio wave transmission and reception can be more effectively suppressed, and the performance of the antenna pattern area 20 as an antenna can be further enhanced. Note that the upper limit of the shortest distance D may be set appropriately within the range in which the antenna pattern area 20 fits within the frame 91.

[0063] Furthermore, the antenna pattern area 20 is positioned closer to the frame 91 than the display unit 97. This facilitates the connection between the antenna pattern area 20 and the wireless communication circuit 94a provided on the frame 91. In the illustrated example, the antenna pattern area 20 extends in the Y direction so as to reach the rim 92 of the frame 91 when viewed from the front of the HMD 90. In this case, at least a portion of the antenna pattern area 20 may be positioned so as to overlap the rim 92 of the frame 91 when viewed from the front of the HMD 90. This further facilitates the connection between the antenna pattern area 20 and the wireless communication circuit 94a provided on the rim 92 of the frame 91. Note that the antenna pattern area 20 does not necessarily have to reach the rim 92 of the frame 91 when viewed from the front of the HMD 90.

[0064] (Dummy pattern area) Next, the dummy pattern area 30 will be described. Referring again to Figure 4, the dummy pattern area 30 is provided so as to surround each antenna pattern area 20, and is formed to surround the entire circumferential area (positive X direction, negative X direction, positive Y direction) of each antenna pattern area 20, excluding the side with the power supply unit 40 (negative Y direction). In this case, the dummy pattern area 30 is on the substrate 11 and is arranged over almost the entire area excluding the antenna pattern area 20 and the power supply unit 40. Unlike the antenna pattern area 20, this dummy pattern area 30 does not substantially function as an antenna.

[0065] As shown in Figure 5, the dummy pattern region 30 is composed of repeating dummy wiring 30a having a predetermined unit pattern shape. That is, the dummy pattern region 30 includes multiple dummy wirings 30a of the same shape, and each dummy wiring 30a is electrically independent from the antenna pattern region 20 (antenna wiring 21 and antenna connecting wiring 22). Furthermore, the multiple dummy wirings 30a are regularly arranged throughout the entire area of ​​the dummy pattern region 30. The multiple dummy wirings 30a are spaced apart from each other in the planar direction and are arranged in an island-like manner, protruding from the substrate 11. That is, each dummy wiring 30a is electrically independent from the antenna pattern region 20, the power supply section 40, and other dummy wirings 30a. Each of these dummy wirings 30a is approximately L-shaped in plan view and has a first dummy wiring portion 31 extending in the Y direction and a second dummy wiring portion 32 extending in the X direction. Of these, the first dummy wiring portion 31 has a predetermined length L2 (length in the Y direction), and the second dummy wiring portion 32 has a predetermined length L3 (length in the X direction), and these are equal to each other (L2 = L3).

[0066] A gap 33a (shaded area in Figure 5) is formed between adjacent dummy wirings 30a in the X direction, and a gap 33b (shaded area in Figure 5) is formed between adjacent dummy wirings 30a in the Y direction. In this case, the dummy wirings 30a are arranged at equal intervals from each other. That is, adjacent dummy wirings 30a in the X direction are arranged at equal intervals from each other, and their gap G1 can be, for example, in the range of 1 μm to 20 μm. Similarly, adjacent dummy wirings 30a in the Y direction are arranged at equal intervals from each other, and their gap G2 can be, for example, in the range of 1 μm to 20 μm. Note that the maximum values ​​of gaps G1 and G2 may be 0.8 times or less of the pitch P1 and P2 described above, respectively. In this case, the gap G1 in the X direction of the dummy wiring 30a is equal to the gap G2 in the Y direction of the dummy wiring 30a (G1 = G2).

[0067] In this embodiment, the dummy wiring 30a has a shape in which a part of the unit pattern shape 20a of the antenna pattern region 20 described above is missing. That is, the shape of the dummy wiring 30a is the L-shaped unit pattern shape 20a of the antenna pattern region 20 with the gaps 33a and 33b described above removed. In other words, the shape obtained by combining the multiple dummy wirings 30a and the multiple gaps 33a and 33b of the dummy pattern region 30 corresponds to the grid shape or mesh shape that forms the antenna pattern region 20. In this way, by making the dummy wiring 30a of the dummy pattern region 30 have a shape in which a part of the unit pattern shape 20a of the antenna pattern region 20 is missing, it is possible to make it difficult to visually recognize the difference between the antenna pattern region 20 and the dummy pattern region 30, and to make the antenna pattern region 20 placed on the substrate 11 less visible.

[0068] In Figure 5, the antenna pattern area 20 and the dummy pattern area 30 are adjacent in the Y direction. Near the boundary between the antenna pattern area 20 and the dummy pattern area 30, the first dummy wiring portion 31 is formed on the extension of the antenna wiring 21. As a result, the difference between the antenna pattern area 20 and the dummy pattern area 30 is difficult to see with the naked eye. Although not shown, in locations where the antenna pattern area 20 and the dummy pattern area 30 are adjacent in the X direction, it is preferable for the second dummy wiring portion 32 to be formed on the extension of the antenna connecting wiring 22 for the same reason.

[0069] As shown in Figure 12, the first dummy wiring portion 31 of each dummy wiring 30a has a roughly rectangular or roughly square cross-section (cross-section in the X direction) perpendicular to its longitudinal direction (Y direction). Also, as shown in Figure 7, the second dummy wiring portion 32 of each dummy wiring 30a has a roughly rectangular or roughly square cross-section (cross-section in the Y direction) perpendicular to its longitudinal direction (X direction). In this case, the cross-sectional shape of the first dummy wiring portion 31 is roughly the same as the cross-sectional shape of the antenna wiring 21, and the cross-sectional shape of the second dummy wiring portion 32 is roughly the same as the cross-sectional shape of the antenna connecting wiring 22.

[0070] In this embodiment, the line width W3 (length in the X direction, see Figure 12) of the first dummy wiring section 31 is approximately the same as the line width W1 of the antenna wiring 21, and the line width W4 (length in the Y direction, see Figure 7) of the second dummy wiring section 32 is approximately the same as the line width W2 of the antenna connecting wiring 22. Furthermore, the height H3 (length in the Z direction, see Figure 12) of the first dummy wiring section 31 and the height H4 (length in the Z direction, see Figure 7) of the second dummy wiring section 32 are approximately the same as the height H1 of the antenna wiring 21 and the height H2 of the antenna connecting wiring 22, respectively.

[0071] The material for the dummy wiring 30a can be the same metal material as the material for the antenna wiring 21 and the antenna connecting wiring 22.

[0072] In this embodiment, the antenna pattern region 20 and the dummy pattern region 30 described above each have predetermined aperture ratios A1 and A2. Of these, the aperture ratio A1 of the antenna pattern region 20 can be, for example, in the range of 85% to 99.9%. The aperture ratio A2 of the dummy pattern region 30 can be, for example, in the range of 87% to less than 100%. In this case, the aperture ratio A2 of the dummy pattern region 30 is greater than the aperture ratio A1 of the antenna pattern region 20 (A2 > A1). This ensures the transparency of the wiring board 10. However, this is not limited to this, and the aperture ratio A2 of the dummy pattern region 30 may be smaller than the aperture ratio A1 of the antenna pattern region 20 (A2 > A1). <A1)。

[0073] Furthermore, the difference (|A2-A1|) between the aperture ratio A2 of the dummy pattern area 30 and the aperture ratio A1 of the antenna pattern area 20 is preferably in the range of greater than 0% and 7% or less, and more preferably in the range of greater than 0% and 1% or less. By reducing the difference between the aperture ratio A2 of the dummy pattern area 30 and the aperture ratio A1 of the antenna pattern area 20 in this way, the boundary between the antenna pattern area 20 and the dummy pattern area 30 is made less visible, and the presence of the antenna pattern area 20 is made less recognizable to the naked eye.

[0074] Furthermore, the aperture ratio A3 of the combined area of ​​the antenna pattern region 20 and the dummy pattern region 30 (i.e., the overall aperture ratio of the wiring board 10) can be, for example, in the range of 87% or more and less than 100%. By setting the aperture ratio A3 within this range, the conductivity and transparency of the wiring board 10 can be ensured.

[0075] The aperture ratio refers to the ratio (%) of the area of ​​the aperture region (the area where metal parts such as antenna wiring 21, antenna connecting wiring 22, and dummy wiring 30a are absent and the substrate 11 is exposed) to the unit area of ​​a predetermined region (antenna pattern region 20, dummy pattern region 30, or antenna pattern region 20 and dummy pattern region 30).

[0076] Referring again to Figure 4, the power supply unit 40 is electrically connected to the antenna pattern area 20. This power supply unit 40 consists of a thin, conductive plate-like member that is roughly rectangular in shape. The longitudinal direction of the power supply unit 40 is parallel to the X direction, and the short direction of the power supply unit 40 is parallel to the Y direction. The power supply unit 40 is also located at the longitudinal end (negative Y-direction end) of the substrate 11. The material of the power supply unit 40 can be a metallic material (including alloys) such as gold, silver, copper, platinum, tin, aluminum, iron, or nickel. When the wiring board 10 is assembled into the HMD 90, this power supply unit 40 is electrically connected to the wireless communication circuit 94a (see Figure 2) provided on the frame 91 of the HMD 90. Here, it is preferable that the power supply unit 40 is located in a position that overlaps the rim 92 of the frame 91 when viewed from the front of the HMD 90. This makes it easier to connect the antenna pattern area 20 to the wireless communication circuit 94a, and also suppresses interference with visibility of the outside world. The power supply unit 40 is provided on the surface of the substrate 11, but is not limited to this, and part or all of the power supply unit 40 may be located outside the periphery of the substrate 11.

[0077] [Manufacturing method for wiring boards] Next, a method for manufacturing a wiring board will be described with reference to Figures 13A to 13F. Figures 13A to 13F are cross-sectional views showing a method for manufacturing a wiring board.

[0078] First, a transparent substrate 11 is prepared, as shown in Figure 13A.

[0079] Next, an antenna pattern region 20 including a plurality of antenna wirings 21 and a dummy pattern region 30 arranged around the antenna pattern region 20 and electrically independent from the antenna wirings 21 are formed on the substrate 11. At this time, a conductive layer 51 is first formed over substantially the entire surface of the substrate 11. In this embodiment, the thickness of the conductive layer 51 is 200 nm. However, it is not limited to this, and the thickness of the conductive layer 51 can be appropriately selected in the range of 10 nm to 1000 nm. In this embodiment, the conductive layer 51 is formed by sputtering using copper. Plasma CVD may also be used as a method for forming the conductive layer 51.

[0080] Next, as shown in Figure 13B, a photocurable insulating resist 52 is supplied to substantially the entire surface of the substrate 11. Examples of photocurable insulating resist 52 include organic resins such as acrylic resins and epoxy resins.

[0081] Next, as shown in Figure 13C, the insulating layer 54 is formed by photolithography. In this case, the photocurable insulating resist 52 is patterned by photolithography to form an insulating layer 54 (resist pattern) with trenches 54a. The trenches 54a have planar patterns corresponding to the antenna wiring 21, antenna connecting wiring 22, and dummy wiring 30a. At this time, the insulating layer 54 is formed so that the conductive layer 51 corresponding to the antenna wiring 21, antenna connecting wiring 22, and dummy wiring 30a is exposed.

[0082] In addition, trenches 54a can be formed on the surface of the insulating layer 54 by an imprint method. In this case, a transparent imprint mold having protrusions corresponding to the trenches 54a is prepared, and the mold and the substrate 11 are brought into close proximity, and a photocurable insulating resist 52 is spread between the mold and the substrate 11. Next, light is irradiated from the mold side to cure the photocurable insulating resist 52, thereby forming the insulating layer 54. This forms trenches 54a with a transferred shape of protrusions on the surface of the insulating layer 54. After that, the mold is peeled off from the insulating layer 54 to obtain an insulating layer 54 with the cross-sectional structure shown in Figure 13C. Hereinafter, although not shown, residue of insulating material may remain at the bottom of the trenches 54a of the insulating layer 54. For this reason, the residue of insulating material is removed by wet treatment using a permanganate solution or N-methyl-2-pyrrolidone, or by dry treatment using oxygen plasma. By removing the residue of insulating material in this way, trenches 54a exposing the conductive layer 51 can be formed as shown in Figure 13C.

[0083] Next, as shown in Figure 13D, the trenches 54a of the insulating layer 54 are filled with the conductor 55. In this embodiment, the conductive layer 51 is used as a seed layer, and the trenches 54a of the insulating layer 54 are filled with copper using an electrolytic plating method.

[0084] Next, as shown in Figure 13E, the insulating layer 54 is removed. In this case, the insulating layer 54 on the substrate 11 is removed by wet treatment using a permanganate solution, N-methyl-2-pyrrolidone, an acid or alkaline solution, or by dry treatment using oxygen plasma.

[0085] Subsequently, as shown in Figure 13F, the conductive layer 51 on the surface of the substrate 11 is removed. In this process, the conductive layer 51 is etched by wet treatment using hydrogen peroxide solution so that the surface of the substrate 11 is exposed. In this way, a wiring board 10 is obtained having the substrate 11 and an antenna pattern region 20 and a dummy pattern region 30 arranged on the substrate 11. In this case, the antenna pattern region 20 includes antenna wiring 21 and antenna connecting wiring 22, and the dummy pattern region 30 includes dummy wiring 30a. The conductor 55 described above includes the antenna wiring 21, the antenna connecting wiring 22, and the dummy wiring 30a.

[0086] Then, by attaching the wiring board 10 to the first base material 96 fitted into the rim 92 of the frame 91, the HMD 90 shown in Figure 1 is obtained. Note that the wiring board 10 may be attached to the first base material 96 before the first base material 96 is fitted into the rim 92 of the frame 91.

[0087] [Operation of this embodiment] Next, we will describe the operation of the HMD90, which has this configuration.

[0088] As shown in Figure 2, the wiring board 10 is incorporated into the HMD 90 as a component of the display device 95. The antenna pattern area 20 of the wiring board 10 is electrically connected to the wireless communication circuit 94a of the HMD 90 via the power supply unit 40. In this way, radio waves of a predetermined frequency can be transmitted and received via the antenna pattern area 20, and communication can be performed using the HMD 90. Each dummy pattern area 30 is separated from the antenna pattern area 20 and is electrically independent, so there is no risk that the presence of each dummy pattern area 30 will affect the transmission and reception of radio waves.

[0089] According to this embodiment, in the HMD90, the wiring board 10 has a transparent substrate 11 and an antenna pattern region 20 arranged on the substrate 11 and including a plurality of antenna wirings 21, so that the transparency of the wiring board 10 is ensured. As a result, when the wiring board 10 is incorporated into the HMD90, the outside world can be seen through the opening 23 of the antenna pattern region 20, so that the visibility of the outside world is not obstructed.

[0090] Furthermore, since the wiring board 10 includes an antenna pattern area 20 containing multiple antenna wirings 21, the HMD 90 can be made smaller and lighter compared to the case where the antenna is mounted on the frame 91 of the HMD 90. Also, since the display device 95 attached to the frame 91 has the wiring board 10, the radio wave sensitivity of the HMD 90 can be improved compared to the case where the antenna is mounted on the frame 91 of the HMD 90.

[0091] Furthermore, according to this embodiment, when viewed from the front of the HMD 90 (i.e., when viewed along the thickness direction of the substrate 11), the antenna pattern area 20 and the display unit 97 are offset from each other. In other words, the antenna pattern area 20 is positioned so as not to overlap with the display unit 97 when viewed from the front of the HMD 90. This improves the visibility of the display unit 97. Also, because the antenna pattern area 20 and the display unit 97 are offset from each other when viewed from the front of the HMD 90, the performance of the antenna pattern area 20 as an antenna can be improved. That is, the distance between the antenna pattern area 20 and the conductor display unit 97 can be increased, thus suppressing adverse effects on the transmission and reception of radio waves.

[0092] Furthermore, according to this embodiment, the antenna pattern area 20 is located closer to the frame 91 than the display unit 97. This facilitates the connection between the antenna pattern area 20 and the wireless communication circuit 94a provided on the frame 91.

[0093] Furthermore, according to this embodiment, the wiring board 10 further includes a dummy pattern area 30 that is arranged around the antenna pattern area 20 and is electrically independent from the antenna wiring 21. By arranging the dummy pattern area 30 around the antenna pattern area 20 in this way, the boundary between the antenna pattern area 20 and the other areas can be made unclear. As a result, the antenna pattern area 20 can be made less visible on the display device 95, and the wearer of the HMD 90 can make it difficult to recognize the antenna pattern area 20 with the naked eye.

[0094] (modified version) Next, various modified examples of the HMD will be described with reference to Figures 14 to 18. Figures 14 to 18 are diagrams showing various modified examples of the HMD. In Figures 14 to 18, the same reference numerals are used for parts that are the same as those shown in Figures 1 to 13F, and detailed explanations are omitted.

[0095] (Variation 1) Figure 14 shows the HMD90A according to Modification 1. In Figure 14, the display device 95 is provided on the wiring board 10 and may further have a second substrate 98 that sandwiches the wiring board 10 together with the first substrate 96. The material of the second substrate 98 can be the same as the material of the first substrate 96, and any material that is transparent in the visible light region is acceptable.

[0096] Thus, since the display device 95 is provided on the wiring board 10 and further has a second base material 98 that sandwiches the wiring board 10 together with the first base material 96, even if the HMD 90A comes into contact with surrounding structures or other people, the wiring board 10 can be more effectively prevented from coming into contact with surrounding structures, etc. Therefore, the antenna wiring 21 in the antenna pattern area 20 of the wiring board 10 can be more effectively prevented from being disconnected.

[0097] (Modification 2) Figure 15 shows the HMD90B according to Modification 2. In Figure 15, there are multiple antenna pattern regions 20 on the substrate 11, and each antenna pattern region 20 may have a different function.

[0098] In the HMD90B shown in Figure 15, multiple antenna pattern regions 20 (20b to 20e) are arranged on the substrate 11. In this case, the longitudinal direction of some antenna pattern regions 20 is oriented in different directions from that of other antenna pattern regions 20. Specifically, among the multiple antenna pattern regions 20, some antenna pattern regions 20 (20b to 20c) have their longitudinal direction parallel to the X direction or the Y direction. In this case, for example, antenna pattern region 20b may have a gesture sensing function, and antenna pattern region 20c may have a wireless power supply function. In addition, some other antenna pattern regions 20 (20d) have their longitudinal direction non-parallel to the X direction and Y direction (they are inclined). In this case, for example, antenna pattern region 20d may have an anti-fogging function. Furthermore, some antenna pattern regions 20 (20e) are arranged in pairs symmetrically to form a dipole antenna.

[0099] Thus, since there are multiple antenna pattern regions 20 on the substrate 11, and each antenna pattern region 20 has a different function, various functions can be added to the HMD90B.

[0100] (Variation 3) Figure 16 shows the HMD90C according to Modification 3. In Figure 16, at least some of the multiple antenna wires 21 may be arranged irregularly.

[0101] In the HMD90C shown in Figure 16, the longitudinal directions of some antenna wires 21 and those of other antenna wires 21 are oriented in different directions. Specifically, of the multiple antenna wires 21, some antenna wires 21 (21a) have a longitudinal direction parallel to the Y direction. Also, some other antenna wires 21 (21b) have a longitudinal direction that is not parallel to the X and Y directions (they are inclined).

[0102] In this way, by having at least some of the multiple antenna wirings 21 arranged irregularly, it is possible to suppress the occurrence of light rays (a phenomenon in which streaks of light are visible) caused by interference between the light reflected by the antenna wirings 21 on the wiring board 10.

[0103] (Modification 4) Figures 17 and 18 show the HMD90D and 90E according to Modification 4. In Figures 17 and 18, the display unit 97 is provided so as to reach the rim 92 of the frame 91 when viewed from the front of the HMD90D and 90E (i.e., when viewed along the thickness direction of the substrate 11).

[0104] In this case, as shown in Figure 17, the display unit 97 may be positioned to overlap approximately the center of the first substrate 96 in a front view of the HMD 90D, and may extend along the Y direction. Here, the HMD 90 may be provided with wiring (not shown) to control the display unit 97. In this case, the wiring to control the display unit 97 may be arranged to extend from the display unit 97 to the outside of the display unit 97. According to this modified example, even if the wiring to control the display unit 97 is provided on the HMD 90, the wiring can be hidden by the frame 91. This improves visibility of the outside world.

[0105] Furthermore, as shown in Figure 18, the display unit 97 may extend along the inner edge of the rim 92 of the frame 91. In the illustrated example, the display unit 97 extends in the X direction along the inner edge of the rim 92. The display unit 97 may also be positioned in a location that does not overlap with the approximate center of the first base material 96 when viewed from the front of the HMD 90E. In this case, visibility of the outside world can be improved. Although not shown, the display unit 97 may also extend in the Y direction along the inner edge of the rim 92.

[0106] (Variation 5) Furthermore, in the above-described embodiment, an example was given in which the antenna pattern area 20 is located in a position that does not overlap with the display unit 97 when viewed along the thickness direction of the substrate 11, but the invention is not limited to this. Although not shown in the figures, for example, the antenna pattern area 20 may overlap with the display unit 97 when viewed along the thickness direction of the substrate 11.

[0107] (Experimental variation 6) Furthermore, in the above-described embodiment, an example was described in which the wiring board 10 is arranged around the antenna pattern area 20 and further includes a dummy pattern area 30 that is electrically independent from the antenna wiring 21, but the invention is not limited to this. Although not shown in the figures, for example, the wiring board 10 may not include a dummy pattern area 30 that is electrically independent from the antenna wiring 21.

[0108] The multiple components disclosed in the above embodiments and each of their variations can be combined as needed. Alternatively, some components may be removed from all the components shown in the above embodiments and each of their variations.

Claims

1. Frame and, The frame is equipped with a transparent display device, The aforementioned display device is First substrate and A wiring board provided on the first substrate, It has a display unit provided between the first substrate and the wiring board, The aforementioned wiring board is A transparent substrate, The substrate is arranged and includes a wiring pattern region which includes a plurality of wires, A head-mounted display in which the entire wiring pattern area is positioned so as not to overlap with the display unit when viewed from the front.

2. The head-mounted display according to claim 1, wherein the shortest distance between the wiring pattern area and the display unit is 0.1 mm or more.

3. The head-mounted display according to claim 1 or 2, wherein the display device further comprises a second substrate provided on the wiring board and sandwiching the wiring board together with the first substrate.

4. The head-mounted display according to any one of claims 1 to 3, wherein the wiring pattern area is located closer to the frame than the display unit.

5. The head-mounted display according to any one of claims 1 to 4, wherein the wiring pattern area has at least one of the following functions: radio wave transmission / reception function, gesture sensing function, wireless power supply function, and anti-fogging function.

6. The head-mounted display according to claim 5, wherein a plurality of wiring pattern regions exist on the substrate, and each of the wiring pattern regions has a different function.

7. The head-mounted display according to any one of claims 1 to 6, wherein at least a portion of the multiple wires are arranged irregularly.

8. The head-mounted display according to any one of claims 1 to 7, wherein the substrate includes glass or a resin film.

9. The head-mounted display according to any one of claims 1 to 8, wherein the wiring board further includes a dummy pattern area arranged around the wiring pattern area and electrically independent from the wiring.

10. The head-mounted display according to any one of claims 1 to 9, wherein the wiring pattern region has a sheet resistance of 5Ω / □ or less, and the maximum width of each wiring when viewed at a 120° viewing angle is 3μm or less.

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