Display device, electronic apparatus, and method for manufacturing display device

Abstract

The invention relates to a display device, an electronic apparatus, and a method of manufacturing the display device. A display device having a touch function and an electronic apparatus are light and thin. A display device (103) is provided with: a first polarizing plate (6) having a first main surface (6b); a second polarizing plate (2) facing the first main surface (6b); a liquid crystal cell (3) provided between the first polarizing plate (6) and the second polarizing plate (2); and a touch function layer (5) provided between the first polarizing plate (6) and the liquid crystal cell (3). The touch function layer (5) has an electrode for detecting a touch input. The touch function layer (5) is formed on a first main surface (6b) of the first polarizing plate (6).

Description

Technical Field

[0001] The present invention relates to a display device, an electronic device and a method for manufacturing the display device. Background Art

[0002] An electronic device including a touch-operable display device is used (for example, refer to Patent Document 1). The touch-operable display device includes a touch function unit including electrodes for detecting touch input.

[0003] Patent document 1: Japanese Patent Application Publication No. 2022-160982.

[0004] In the above-mentioned electronic devices, it is required to make the display device with a touch function lighter and thinner. Summary of the invention

[0005] An object of one embodiment of the present invention is to achieve a reduction in thickness and weight in a display device and an electronic device having a touch function.

[0006] A display device involved in one embodiment of the present invention comprises: a first polarizing plate having a first main surface; a second polarizing plate arranged on the back side relative to the first polarizing plate and opposite to the first main surface; a liquid crystal unit arranged between the first polarizing plate and the second polarizing plate; and a touch function layer arranged between the first polarizing plate and the liquid crystal unit, having electrodes for detecting touch input, and the touch function layer is formed on the first main surface of the first polarizing plate.

[0007] The electrode may include: a first electrode extending in a first direction along the first main surface; and a second electrode extending in a second direction intersecting the first direction along the first main surface, wherein the first electrode and the second electrode are formed to form a multilayer structure.

[0008] An electronic device according to one aspect of the present invention includes the above-mentioned display device.

[0009] In a manufacturing method of a display device involved in one embodiment of the present invention, the display device comprises: a first polarizing plate having a first main surface; a second polarizing plate arranged on the back side relative to the first polarizing plate and opposite to the first main surface; a liquid crystal unit arranged between the first polarizing plate and the second polarizing plate; and a touch function layer arranged between the first polarizing plate and the liquid crystal unit, having an electrode for detecting touch input, wherein, when forming the touch function layer of the display device, a recess forming member having a plurality of protrusions is used, the recess is formed by pressing the protrusions onto the surface of an insulating layer, and the recess is filled with a conductive material to form the electrode.

[0010] According to one aspect of the present invention, it is possible to achieve a reduction in thickness and weight in a display device and an electronic device having a touch function. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of an electronic device according to an embodiment.

[0012] Figure 2 It is a schematic exploded perspective view of the display device according to the embodiment.

[0013] Figure 3 It is an enlarged cross-sectional view of a first polarizing plate and a touch function layer of a display device according to an embodiment.

[0014] Figure 4 It is a structural diagram of a manufacturing apparatus of a display device involved in an embodiment.

[0015] Figure 5 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0016] Figure 6 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0017] Figure 7 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0018] Figure 8 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0019] Fig. 9 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0020] Fig.10 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0021] Fig.11 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0022] Fig.12 It is a process diagram of a method for manufacturing a display device according to an embodiment.

[0023] Description of Reference Numerals

[0024] 2…second polarizing plate; 3…liquid crystal unit; 5…touch function layer; 6…first polarizing plate; 6b…lower surface (first main surface); 20…electrode; 21…first electrode; 22…second electrode; 100…electronic device. DETAILED DESCRIPTION

[0025] A display device, an electronic device, and a method for manufacturing a display device according to the embodiments will be described.

[0026] [Electronic equipment]

[0027] Figure 1 It is a perspective view of the electronic device 100 according to the embodiment. Figure 2 It is a schematic exploded perspective view of the display device 103 . Figure 3 It is an enlarged cross-sectional view of the first polarizing plate 6 and the touch function layer 5 .

[0028] like Figure 1 As shown, the electronic device 100 includes a first housing 101 and a second housing 102 (housings). The electronic device 100 is, for example, a notebook PC (PC: personal computer).

[0029] The ends of the first frame body 101 and the second frame body 102 are connected to each other via a hinge mechanism 110. The first frame body 101 is relatively rotatable with respect to the second frame body 102 around a rotation axis formed by the hinge mechanism 110.

[0030] The second frame 102 is also referred to as a system frame. The second frame 102 is formed in a rectangular plate shape. The end of the second frame 102 where the hinge mechanism 110 is provided is referred to as a second base end 102b. The end opposite to the second base end 102b is referred to as a second open end 102a. The second frame 102 is equipped with a keyboard 107 and a touch pad 108.

[0031] The first frame 101 is also called a display frame. The first frame 101 is formed in a rectangular plate shape. The end of the first frame 101 where the hinge mechanism 110 is provided is called a first base end 101b. The end opposite to the first base end 101b is called a first open end 101a.

[0032] The first housing 101 includes a display device 103. The display device 103 is, for example, a liquid crystal display.

[0033] [Display device]

[0034] like Figure 2 As shown, the display device 103 includes a backlight unit 1 , a second polarizing plate 2 , a liquid crystal unit 3 , an optical bonding layer 4 , a touch function layer 5 , a first polarizing plate 6 , and a cover 7 .

[0035] Regarding the display device 103, the positional relationship of each structure is described using an XYZ orthogonal coordinate system. The X direction and the Y direction are directions parallel to the lower surface 6b (first main surface) of the first polarizing plate 6. The X direction and the Y direction are orthogonal to each other. The Z direction is orthogonal to the X direction and the Y direction. The plane containing the X direction and the Y direction is the XY plane.

[0036] At once Figure 2 For the purpose of this paper, the vertical positional relationship of each structure is described. Figure 2 In the embodiment, the cover 7 is located above the backlight unit 1 . Figure 2 The upper surface of the display device 103 in the embodiment is the observation surface. The "observation surface" is the surface of the display device 103 on the side where the user performs visual confirmation. The observation surface of the display device 103 is opposite to the second frame body 102 when the first frame body 101 is closed relative to the second frame body 102. The "back surface" is the surface opposite to the observation surface. The positional relationship determined here does not limit the posture of the display device and the electronic device when in use.

[0037] The backlight unit 1, the second polarizing plate 2, the liquid crystal cell 3, the optical bonding layer 4, the touch function layer 5, the first polarizing plate 6 and the cover 7 are stacked in this order from the back side toward the observation side.

[0038] The backlight unit 1 includes, for example, a light guide plate and light emitting elements disposed on the end surface thereof. The backlight unit 1 may also include a light diffusion plate and light emitting elements disposed on the back surface thereof.

[0039] As the second polarizing plate 2, for example, a polarizing film made of resin can be used. The second polarizing plate 2, for example, has a polarizing film and a protective film (resin film) covering one or both sides of the polarizing film. As the resin constituting the polarizing film, for example, polyvinyl alcohol (PVA) resin, ethylene-vinyl acetate copolymer resin, etc. are listed. The second polarizing plate 2 is located opposite to the lower surface 6b of the first polarizing plate 6.

[0040] The liquid crystal cell 3 (liquid crystal panel) includes a TFT substrate 11, a TFT electrode layer 12, a liquid crystal layer 13, a color filter 14, and a color filter substrate 15. The TFT substrate 11, the TFT electrode layer 12, the liquid crystal layer 13, the color filter 14, and the color filter substrate 15 are stacked in this order from the back side toward the observation side.

[0041] The TFT substrate 11 (TFT: Thin Film Transistor) is formed of glass, resin, or the like.

[0042] The TFT electrode layer 12 is formed on the upper surface of the TFT substrate 11. The TFT electrode layer 12 has a plurality of TFT elements and pixel electrodes. The pixel electrode is a transparent electrode having light transmittance. The pixel electrode is formed of, for example, indium tin oxide (ITO), indium zinc oxide (IZO), indium oxide, tin oxide, etc.

[0043] The liquid crystal layer 13 includes, for example, positive or negative liquid crystal molecules.

[0044] The color filter 14 includes, for example, a red color filter overlapping with a red sub-pixel R, a green color filter overlapping with a green sub-pixel G, and a blue color filter overlapping with a blue sub-pixel B. The color filter 14 is formed on, for example, one surface of a color filter substrate 15 .

[0045] The color filter substrate 15 is formed of, for example, glass.

[0046] The liquid crystal cell 3 has, for example, a transmissive display function for displaying an image by selectively transmitting light emitted from the backlight unit 1. The liquid crystal cell 3 is an example of a display panel.

[0047] The optical bonding layer 4 is light-transmissive. The optical bonding layer 4 can be formed by a sheet of OCA (Optical Clear Adhesive). The optical bonding layer 4 can also be formed by OCR (Optical Clear Resin). The optical bonding layer 4 is between the upper surface of the liquid crystal unit 3 and the lower surface of the touch function layer 5. The optical bonding layer 4 bonds the liquid crystal unit 3 and the touch function layer 5. The optical bonding layer can also be an optical adhesive layer.

[0048] like Figure 3 As shown, the touch function layer 5 includes a first insulating layer 23 having a plurality of first electrodes 21 formed thereon and a second insulating layer 24 having a plurality of second electrodes 22 formed thereon. The second insulating layer 24 is formed on the first insulating layer 23. The first insulating layer 23 and the second insulating layer 24 are stacked in the thickness direction (Z direction).

[0049] The first insulating layer 23 and the second insulating layer 24 are formed of, for example, a resin as an insulating material. Examples of the resin constituting the first insulating layer 23 and the second insulating layer 24 include UV curable resins and thermoplastic resins. The first insulating layer 23 and the second insulating layer 24 are examples of insulating layers (resin layers).

[0050] The touch function layer 5 includes an electrode 20 (touch detection electrode) having an electrode for detecting a touch input. The electrode 20 is connected to the touch function layer 5 via a flexible printed circuit board 71 (see FIG. 1 ). Fig.11 ) is connected to a control substrate (not shown). The control substrate is mounted on the first frame 101 (see Figure 1 ).

[0051] The electrode 20 includes a plurality of first electrodes 21 and a plurality of second electrodes 22. The first electrode 21 extends in a first direction. The first direction is a direction along the XY plane. The plurality of first electrodes 21 are formed at intervals in the line width direction. The second electrode 22 extends in a second direction. The second direction is a direction along the XY plane. The plurality of second electrodes 22 are formed at intervals in the line width direction. The second direction intersects the first direction. The second direction is, for example, orthogonal to the first direction. The first insulating layer 23 and the second insulating layer 24 overlap in the thickness direction (Z direction), so that the first electrode 21 and the second electrode 22 are formed to constitute a multilayer structure.

[0052] In the electrode 20, a mutual capacitance method can be adopted. One of the first electrode 21 and the second electrode 22 is a transmitting electrode (driving electrode) Tx. The other of the first electrode 21 and the second electrode 22 is a receiving electrode (detection electrode) Rx. In the mutual capacitance method, the transmitting electrode Tx and the receiving electrode Rx generate an electric field. The electrode 20 detects a change in the electric field accompanying the approach or contact of an object. Thus, the electrode 20 detects a touch input performed by a user's finger or the like.

[0053] A plurality of first recesses 25 are formed on the upper surface 23a (one surface) of the first insulating layer 23. The first recesses 25 are formed, for example, in a groove shape along the first direction. The plurality of first recesses 25 are formed at intervals in the groove width direction. The first electrode 21 is formed of a conductive material 64 filled in the first recesses 25.

[0054] A plurality of second recesses 26 are formed on the upper surface 24a (one surface) of the second insulating layer 24. The second recesses 26 are formed, for example, in a groove shape along the second direction. The plurality of second recesses 26 are formed at intervals in the groove width direction. The second electrode 22 is formed of a conductive material 64 filled in the second recesses 26.

[0055] A protective layer 65 made of black ink may be formed on the surface of the conductive material 64 in the first recess 25 and the second recess 26 .

[0056] A terminal portion 27 electrically connected to the first electrode 21 and the second electrode 22 is formed on a portion of the upper surface 24a of the second insulating layer 24 (see Fig.12 ).

[0057] The touch function layer 5 is formed on the lower surface 6b (first main surface) of the first polarizing plate 6. The upper surface of the touch function layer 5 (the upper surface 24a of the second insulating layer 24) is in direct or indirect contact with the lower surface 6b of the first polarizing plate 6. For example, the upper surface of the touch function layer 5 can be directly (i.e., without inclusions) formed on the lower surface 6b, or can be formed on the lower surface 6b via an optical bonding layer (or optical adhesive layer) or the like.

[0058] like Figure 2 As shown, as the first polarizing plate 6, for example, a polarizing film made of resin can be used. The first polarizing plate 6, for example, has a polarizing film and a protective film (resin film) covering one or both surfaces of the polarizing film. As the resin constituting the polarizing film, for example, polyvinyl alcohol (PVA) resin, ethylene-vinyl acetate copolymer resin, etc. are listed. The transmission axis of the first polarizing plate 6 is, for example, orthogonal to the transmission axis of the second polarizing plate 2 when viewed from the Z direction (a direction orthogonal to the lower surface 6b). The first polarizing plate 6 is, for example, flexible.

[0059] The cover 7 is formed of glass, resin, etc. The cover 7 is formed in a plate shape.

[0060] [Manufacturing method of display device]

[0061] A method for manufacturing the display device according to the embodiment will be described.

[0062] Figure 4 It is a structural diagram of a manufacturing apparatus of a display device according to an embodiment. Figure 5 to Figure 12 1 is a process diagram of a method for manufacturing a display device according to an embodiment. The method for manufacturing a display device according to this embodiment includes a step of forming a touch function layer 5 .

[0063] <Step of forming a touch function layer>

[0064] Figure 4 It represents a device for forming the touch function layer 5. Figure 4 As shown, the apparatus includes a first layer forming unit 30, a second layer forming unit 40, and a cutting unit 50. The first layer forming unit 30 includes a first resin supply unit 31, a first recess forming member 32, a first UV irradiation unit 33, a first conductive material supply unit 34, and a first heating furnace 35.

[0065] The second layer forming unit 40 includes a second resin supply unit 41, a second recess forming material 42, a second UV irradiation unit 43, a second conductive material supply unit 44, and a second heating furnace 45. The first recess forming material 32 and the second recess forming material 42 may be collectively referred to as "recess forming materials 32, 42".

[0066] The first resin supply unit 31 supplies a resin R1 that is a constituent material of the first insulating layer 23. The second resin supply unit 41 supplies a resin R2 that is a constituent material of the second insulating layer 24. Curable resins are used as the resins R1 and R2 that are constituent materials of the first insulating layer 23 and the second insulating layer 24. Examples of the curable resin include UV curable resins and thermoplastic resins.

[0067] The first recess forming material 32 and the second recess forming material 42 are formed in a cylindrical shape (or a columnar shape) having a central axis C perpendicular to the traveling direction of the substrate 61. The recess forming materials 32 and 42 are recess forming rollers rotatable around the central axis C.

[0068] A plurality of protrusions 36 protruding radially outward are formed on the outer peripheral surface of the recess forming members 32, 42. The plurality of protrusions 36 are formed at positions staggered in the circumferential direction of the recess forming members 32, 42. The plurality of protrusions 36 are formed, for example, at intervals in the circumferential direction of the recess forming members 32, 42.

[0069] The cross-sectional shape of the convex portion 36 (the shape of the cross section orthogonal to the central axis C) may be a rectangular shape or a trapezoidal shape whose width gradually narrows in the protruding direction. The shape of the convex portion 36 is determined according to the shape of the concave portions 25 and 26 to be formed. The convex portion 36 may be a ridge (linear protrusion) extending in the direction of the concave portions 25 and 26 to be formed.

[0070] The first UV irradiation unit 33 cures the first insulating layer 23 by UV irradiation. The second UV irradiation unit 43 cures the second insulating layer 24 by UV irradiation.

[0071] The first conductive material supply unit 34 and the second conductive material supply unit 44 supply a conductive material 64. For example, a conductive paste is used as the conductive material 64. For example, a metal paste containing particles made of a metal such as silver, copper, or aluminum is used as the conductive paste.

[0072] The first heating furnace 35 and the second heating furnace 45 heat and cure the conductive material 64 by, for example, infrared irradiation or the like.

[0073] The step of forming the touch function layer 5 will be described in detail. The step of forming the touch function layer 5 includes the first to sixth sub-steps shown below.

[0074] (First Sub-Process: Formation of First Insulating Layer and First Electrode)

[0075] like Figure 4 as well as Figure 5 As shown in FIG. 1 , a sheet-shaped substrate 61 made of polyethylene terephthalate (PET) or the like is prepared. Figure 5 As shown, UV ink 62 may be applied in advance on the upper surface of the substrate 61. The substrate 61 and the UV ink 62 are UV (ultraviolet) transparent.

[0076] like Figure 4 As shown, the base material 61 is pulled out from the roller 63. The base material 61 is pulled and the UV curable resin R1 is applied to the upper surface of the base material 61 using the first resin supply unit 31. Thus, the first insulating layer 23 is formed on the upper surface of the base material 61.

[0077] The first recessed portion forming member 32 is rotated about the axis according to the pulling speed of the substrate 61, and the plurality of protrusions 36 are pressed against the uncured first insulating layer 23. Thus, a plurality of first recessed portions 25 (see Figure 6 ).

[0078] The first UV irradiation unit 33 irradiates UV rays toward the first insulating layer 23 through the base material 61 , thereby curing the first insulating layer 23 .

[0079] The first concave portion 25 is filled with a conductive material 64 (eg, conductive paste) using the first conductive material supply unit 34. A protective layer 65 may be formed on the surface of the conductive material 64 in the first concave portion 25 (see Figure 7 ).

[0080] The substrate 61 formed with the first insulating layer 23 is introduced into the first heating furnace 35, and the conductive material 64 is heated and cured by infrared irradiation or the like. Thus, the first electrode 21 composed of the conductive material 64 is formed in the first recess 25 (see Figure 7 ).

[0081] (Second Sub-Process: Formation of Second Insulating Layer and Second Electrode)

[0082] The UV curable resin R2 is applied to the upper surface of the first insulating layer 23 using the second resin supply unit 41 . Thus, the second insulating layer 24 is formed on the upper surface of the first insulating layer 23 .

[0083] The second recessed portion forming member 42 is rotated about the axis according to the pulling speed of the substrate 61, and the plurality of protrusions 36 are pressed against the uncured second insulating layer 24. Thus, a plurality of second recessed portions 26 are formed on the upper surface of the second insulating layer 24 (see Figure 8 ).

[0084] The second UV irradiation unit 43 irradiates the second insulating layer 24 with UV light through the base material 61 and the first insulating layer 23 , thereby curing the second insulating layer 24 .

[0085] The second concave portion 26 is filled with the conductive material 64 using the second conductive material supply unit 44. A protective layer 65 may be formed on the surface of the conductive material 64 in the second concave portion 26 (see Fig. 9 ).

[0086] In the second heating furnace 45, the conductive material 64 is heated and cured by infrared irradiation or the like. Thus, the second electrode 22 (see FIG. 2 ) composed of the conductive material 64 is formed in the second recess 26. Fig. 9 ).

[0087] (The third sub-process: cutting)

[0088] The insulating layers 23 and 24 and the base material 61 are cut into predetermined lengths using the cutting unit 50 .

[0089] (Fourth Sub-Step: Connection of Flexible Printed Circuit Board)

[0090] like Fig.10 As shown, the end of the flexible printed circuit board 71 is connected to the terminal portion 27 of the second insulating layer 24. Thus, the first electrode 21 and the second electrode 22 are electrically connected to a control board (not shown) via the flexible printed circuit board 71.

[0091] (Fifth Sub-Step: Mounting of First Polarizing Plate)

[0092] like Fig.11 As shown, the first polarizing plate 6 is overlapped with the upper surface 24a of the second insulating layer 24. The lower surface 6b of the first polarizing plate 6 can be directly formed on the upper surface 24a of the second insulating layer 24, or can be formed by indirectly contacting the upper surface 24a via a bonding layer (or adhesive layer). Thus, the touch function layer 5 is formed on the lower surface 6b of the first polarizing plate 6.

[0093] (Sixth Sub-Step: Removal of Base Material 61)

[0094] like Fig.12 As shown, the base material 61 is peeled off from the touch function layer 5 (specifically, the first insulating layer 23). Thus, the first polarizing plate 6 having the touch function layer 5 formed on the lower surface 6b is obtained.

[0095] <Process of combining with other structures>

[0096] like Figure 2 As shown, the display device 103 is manufactured by combining the first polarizing plate 6 formed with the touch function layer 5, the cover 7, the optical bonding layer 4, the liquid crystal unit 3, the second polarizing plate 2 and the backlight unit 1.

[0097] [Effects of the display device and the manufacturing method thereof according to the embodiment]

[0098] In the display device 103 of this embodiment, the touch function layer 5 is formed on the lower surface 6b (first main surface) of the first polarizing plate 6, so the overall thickness can be suppressed compared to the case where the touch function layer is formed on a component of the liquid crystal unit (for example, a color filter substrate). Therefore, the display device 103 can be made thinner. Since the display device 103 can be made thinner, the electronic device 100 can also be made thinner.

[0099] On the other hand, for example, in an on-cell display device in which a touch function layer is formed on a color filter substrate, the color filter substrate is subjected to thinning processing, so the color filter substrate needs to have a sufficient thickness, which makes it difficult to reduce the thickness of the display device.

[0100] In the display device 103, except for the first polarizing plate 6 and the touch function layer 5, most of the components are the same as those of the existing display device. Therefore, the existing components can be directly used, which is advantageous in terms of manufacturing cost and ease of manufacturing.

[0101] In contrast, display devices that adopt an On-Cell type, In-Cell type, or the like have many dedicated components, which is disadvantageous in terms of manufacturing cost, ease of manufacturing, and the like.

[0102] In the display device 103 , when manufacturing both a display device with a touch function and a display device without a touch function, the number of common components of the two display devices can be increased, and thus the manufacturing cost can be suppressed.

[0103] The display device 103 can be made thinner and lighter, so when manufacturing both a display device with a touch function and a display device without a touch function, the difference in thickness between the two display devices can be reduced. Therefore, the first frame (display frame) on which the display device is mounted can be shared. Thus, the manufacturing cost can be suppressed.

[0104] In the display device 103, the touch function layer 5 is formed to have a multilayer structure including the first electrode 21 and the second electrode 22. Thus, the touch function layer 5 can be formed thinner. Therefore, the display device 103 can be made thinner.

[0105] In the manufacturing method of the display device 103 of the present embodiment, the convex portion 36 of the concave portion forming member 32, 42 is pressed against the insulating layers 23, 24 to form the concave portions 25, 26, and the conductive material 64 is filled into the concave portions 25, 26 to form the electrodes 21, 22. In this manufacturing method, the cost of manufacturing the first polarizing plate 6 with the touch function layer 5 can be reduced compared to the method of forming the concave portion in the insulating layer by etching or the like. Therefore, the manufacturing cost of the display device 103 can be reduced.

[0106] exist Figure 4 In the manufacturing device shown, a general-purpose device can be used except for the recess forming members 32 and 42. Therefore, in this manufacturing method, the first polarizing plate 6 with the touch function layer 5 can be manufactured at low cost. In this manufacturing method, it is also possible to easily cope with the manufacture of a plurality of display devices with different specifications.

[0107] In this manufacturing method, the touch function layer 5 is formed on the lower surface 6b (first main surface) of the first polarizing plate 6, so that the display device 103 can be made thinner and lighter compared to the case where the touch function layer is formed on a component of the liquid crystal unit (for example, a color filter substrate).

[0108] Except for the step of forming the touch function layer 5, most of the steps of this manufacturing method are the same as those of the existing display device manufacturing method. Therefore, the existing production line can be used. Therefore, it is advantageous in terms of manufacturing cost, ease of manufacturing, etc.

[0109] This manufacturing method uses the recess forming members 32 and 42, so that the first recess 25 can be formed in the first insulating layer 23, the second insulating layer 24 can be formed on the first insulating layer 23, and the second recess 26 can be formed in the second insulating layer 24. According to this method, the insulating layers 23 and 24 having a plurality of recesses can be stacked on one surface of the substrate 61. Therefore, compared with the method of forming the insulating layers having a plurality of recesses on different substrates, the insulating layers 23 and 24 having a multilayer structure can be easily manufactured.

[0110] The specific structure of the present invention is not limited to the above-mentioned embodiment, and also includes the design etc. which do not deviate from the scope of the gist of the present invention. Each structure described in the above-mentioned embodiment can be combined arbitrarily.

[0111] Figure 4 The shape of the convex portion 36 of the recess forming members 32 and 42 shown (the shape of the cross section perpendicular to the central axis C) is not particularly limited, and may be a wedge shape, a semicircular shape, or the like.

[0112] In the display device 103 of the embodiment, the touch function layer 5 adopts a mutual capacitance method, but a self-capacitance method may also be adopted as a touch input detection method.

[0113] The electronic device is not limited to a notebook PC, and may be a tablet terminal, a smartphone, a desktop PC, or the like.

Claims

1. A display device comprising: A first polarizing plate having a first main surface; A second polarizing plate, arranged on the back side relative to the first polarizing plate and facing the first main surface; A liquid crystal unit, disposed between the first polarizing plate and the second polarizing plate; as well as A touch function layer is disposed between the first polarizing plate and the liquid crystal unit and has electrodes for detecting touch input. The touch function layer is formed on the first main surface of the first polarizing plate.

2. The display device according to claim 1, wherein: The electrodes include: a first electrode extending in a first direction along the first main surface; and a second electrode extending in a second direction intersecting the first direction along the first main surface, The first electrode and the second electrode are formed to constitute a multi-layer structure.

3. An electronic device, wherein: A display device according to claim 1 or 2 is provided.

4. A method for manufacturing a display device, the display device comprising: a first polarizing plate having a first main surface; a second polarizing plate arranged on the back side relative to the first polarizing plate and facing the first main surface; a liquid crystal unit arranged between the first polarizing plate and the second polarizing plate; and a touch function layer arranged between the first polarizing plate and the liquid crystal unit and having an electrode for detecting touch input, wherein: When forming the touch function layer of the display device, a recess forming member having a plurality of protrusions is used, the protrusions are pressed against a surface of an insulating layer to form recesses, and a conductive material is filled into the recesses to form the electrodes.

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