Display device

Abstract

A display device includes a display panel and a protector disposed on a display surface of the display panel. The protector includes a first glass substrate at a user side, a second glass substrate between the first glass substrate and the display surface, and a first adhesive layer adhering the first glass substrate and the second glass substrate to each other. A thickness of the first glass substrate is 0.5 mm or less, and a strike value of the first adhesive layer is 7 to 10.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of Japanese Patent Application No. 2022-116830, filed on July 22, 2022, and Japanese Patent Application No. 2023-052836, filed on March 29, 2023, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to a display device. Background Technology

[0004] To improve the safety of occupants (crew members, passengers, etc.) in vehicles and trains, it is necessary to reduce the harm caused to occupants by display devices provided in vehicles and trains. For example, the European vehicle standard (ECE-R21: United Nations Economic Commission for Europe (UN / ECE) Regulation No. 21) applies to internal components of vehicles, including display devices. ECE-R21 requires that internal components of vehicles be non-lethal.

[0005] Meanwhile, glass laminates with excellent durability, sound suppression properties, and fracture resistance are known. For example, Japanese Patent No. 6328619 discloses a glass laminate comprising a first outer glass plate, a second outer glass plate, and a polymer interlayer. The first and second outer glass plates have a thickness of less than 2 mm, and at least one of the first or second outer glass plates is chemically strengthened glass. The polymer interlayer is formed from a specific polymer material, such as an ionomer or polycarbonate. Furthermore, the glass laminate of Japanese Patent No. 6328619 has an impact value of at least 7.

[0006] In the glass laminate of Japanese Patent No. 6328619, the glass and polymer materials that can be used are limited. In particular, expensive chemically strengthened glass is used in the glass laminate of Japanese Patent No. 6328619. Furthermore, the potential for fatal consequences to the user is not adequately considered in the glass laminate of Japanese Patent No. 6328619.

[0007] This disclosure is made in view of the foregoing, and the purpose of this disclosure is to provide a display device that is less lethal to the user. Summary of the Invention

[0008] The display device of this disclosure for achieving the above objectives includes:

[0009] Display panel; and

[0010] The protector is installed on the display surface of the display panel, wherein...

[0011] The protector includes a first glass substrate located on the user side, a second glass substrate located between the first glass substrate and the display surface, and a first adhesive layer that adheres the first glass substrate and the second glass substrate to each other.

[0012] The thickness of the first glass substrate is 0.5 mm or less, and

[0013] The impact value of the first adhesive layer is 7 to 10.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory, and not intended to limit this disclosure.

[0015] According to this disclosure, the thickness of the first glass substrate located on the user side is 0.5 mm or less, and the impact value of the first adhesive layer on the first and second glass substrates is 7 to 10. This reduces the catastrophic potential of the display device. Attached Figure Description

[0016] A more complete understanding of this application can be obtained by considering the following detailed description in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 This is a plan view showing the display device according to Embodiment 1;

[0018] Figure 2 yes Figure 1 The display device shown is a cross-sectional view taken along line AA;

[0019] Figure 3 This is a cross-sectional view showing the liquid crystal display panel according to Embodiment 1;

[0020] Figure 4 This is a cross-sectional view of the protector according to Embodiment 1;

[0021] Figure 5 This is a schematic diagram illustrating the breakage of the protector according to Embodiment 1;

[0022] Figure 6 This is a cross-sectional view of the protector according to Embodiment 2;

[0023] Figure 7 This is a plan view showing the second glass substrate according to Embodiment 3;

[0024] Figure 8 This is a cross-sectional view of the protector based on the modified example;

[0025] Figure 9 This is a schematic diagram showing the maximum diameter of the scattering material according to Example 1 and Comparative Example 1;

[0026] Figure 10This is a graph showing the relationship between the thickness of the first glass substrate according to Example 1 and Comparative Example 1 and the average maximum diameter of the scattering material;

[0027] Figure 11 This is a graph showing the relationship between the impact value of the first adhesive layer according to Example 2 and Comparative Example 2 and the average maximum diameter of the scattering material;

[0028] Figure 12 This is a graph showing the relationship between the impact value and the horizontal plane difference of the second adhesive layer according to Example 3; and

[0029] Figure 13 This is a diagram showing the fixed display device according to Example 4. Detailed Implementation

[0030] In the following description, display devices according to various embodiments are described with reference to the accompanying drawings.

[0031] Example 1

[0032] Reference Figures 1 to 5 This embodiment describes a display device 10. The display device 10 is installed in a vehicle, aircraft, home appliance, piece of furniture, etc. In this embodiment and the following embodiments, an example of the display device 10 being installed in a vehicle is described. The occupants of the vehicle correspond to users (observers).

[0033] like Figure 1 and Figure 2 As shown, the display device 10 is disposed on the opening portion 510 of the vehicle dashboard 500. In one example, the dashboard 500 is formed of resin. Note that in this specification, for ease of understanding, ... Figure 1 In the display device 10, the vertical direction (the right direction on the paper) is called the "+X direction", the horizontal direction (the upward direction on the paper) is called the "+Y direction", and the direction perpendicular to the +X and +Y directions (the front direction on the paper, the side of the passenger) is called the "+Z direction".

[0034] Display device 10 includes a display 100 and a protector 200. The display 100 displays characters, images, etc. The protector 200 protects the display panel 110 of the display 100, which is described below.

[0035] like Figure 2 As shown, the display 100 of the display device 10 includes a liquid crystal display panel 110, a backlight 120, and a housing 130. Note that, for ease of understanding, Figure 2 The shading line of the outer shell 130 is omitted.

[0036] In one example, the liquid crystal display panel 110 of the display 100 is implemented as a known transmissive horizontal electric field type liquid crystal display panel. The liquid crystal display panel 110 is an active matrix driven by thin-film transistors (TFTs). The liquid crystal display panel 110 displays characters, images, etc., by modulating light from the backlight 120. The liquid crystal display panel 110 includes a display area 111 and a periphery 112. The display area 111 is the area where pixels are arranged in a matrix and capable of displaying characters, images, etc. The periphery 112 is the area where wiring, driving circuitry, etc., are disposed.

[0037] like Figure 3 As shown, the liquid crystal display panel 110 includes a TFT substrate 114, a counter substrate 115, liquid crystal 116, a first polarizer 117, and a second polarizer 118. The TFT substrate 114 and the counter substrate 115 sandwich the liquid crystal 116 between them. The first polarizer 117 is disposed on the TFT substrate 114. The second polarizer 118 is disposed on the counter substrate 115.

[0038] In one example, the TFT substrate 114 is implemented as a glass substrate. The TFT substrate 114 is located on the -Z side. A TFT for selecting pixels, a common electrode, a pixel electrode, a driving circuit, and an alignment film for aligning the liquid crystal 116 are disposed on the main surface 114a of the TFT substrate 114 on the liquid crystal 116 side (all not shown in the figures). A first polarizing plate 117 is disposed on the main surface 114b of the TFT substrate 114 opposite to the main surface 114a.

[0039] The opposing substrate 115 is located on the +Z side and is opposite to the TFT substrate 114. The opposing substrate 115 is adhered to the TFT substrate 114 by a sealing material 119. In one example, the opposing substrate 115 is implemented as a glass substrate. A color filter, a black matrix, an alignment film for aligning the liquid crystal 116, etc. (not shown in the figures) are provided on the main surface 115a of the opposing substrate 115 on the side opposite to the main surface 115a. A second polarizer 118 is provided on the main surface 115b of the opposing substrate 115 on the side opposite to the main surface 115a.

[0040] Liquid crystal 116 is sandwiched between TFT substrate 114 and opposing substrate 115. In one example, liquid crystal 116 is implemented as a nematic liquid crystal. Liquid crystal 116 is initially aligned in a direction parallel to the main surface 114a of TFT substrate 114 by an alignment film. Furthermore, due to the application of voltage, liquid crystal 116 rotates in a plane parallel to the main surface 114a of TFT substrate 114.

[0041] A first polarizer 117 is disposed on the main surface 114b of the TFT substrate 114. A second polarizer 118 is disposed on the main surface 115b of the opposing substrate 115. One of the transmission axes of the first polarizer 117 and the second polarizer 118 is arranged parallel to the initial alignment direction of the liquid crystal 116. The transmission axes of the first polarizer 117 and the second polarizer 118 are orthogonal to each other. In this embodiment, the main surface 118a on the +Z side of the second polarizer 118 corresponds to the display surface 110a of the liquid crystal display panel 110.

[0042] like Figure 2 As shown, the backlight 120 of the display 100 is disposed on the back side (-Z side) of the liquid crystal display panel 110. The backlight 120 is the light source of the liquid crystal display panel 110 and emits white light onto the liquid crystal display panel 110. The backlight 120 includes a white light-emitting diode (LED), a reflector, a diffuser, an illumination circuit, etc. (all not shown in the figure).

[0043] The housing 130 of the display 100 houses the liquid crystal display panel 110 and the backlight 120. The housing 130 includes a chassis 132 and a bezel 136. Note that a configuration in which the housing 130 does not include the bezel 136 is possible.

[0044] The chassis 132 has a box-like shape and is formed of resin or metal. The chassis 132 houses the liquid crystal display panel 110 and the backlight 120 on its inner side.

[0045] The bezel 136 has a box-like shape. An opening 138 is provided on the bottom 137 of the bezel 136. In one example, the bezel 136 is formed of metal. The bezel 136 covers the chassis 132, with the bottom 137 facing the +Z side, and protects the periphery 112 of the liquid crystal display panel 110. The display area 111 of the liquid crystal display panel 110 is exposed through the opening 138. In this embodiment, the side panels 139 of the bezel 136 are adhered to the inner wall 510a of the opening portion 510 of the instrument panel 500 by an adhesive (not shown). Thus, the display device 10 is fixed to the opening portion 510 of the instrument panel 500.

[0046] like Figure 2 As shown, the protector 200 of the display device 10 is disposed on the display surface (+Z side surface) 110a of the liquid crystal display panel 110. The protector 200 covers the liquid crystal display panel 110. The protector 200 protects the liquid crystal display panel 110. The protector 200 includes a first glass substrate 210, a second glass substrate 220, a first adhesive layer 230, and a second adhesive layer 240.

[0047] The first glass substrate 210 of the protector 200 has a rectangular shape and is located on the occupant side (+Z side). For example... Figure 4As shown, the first glass substrate 210 includes a first main surface 210a on the +Z side and a second main surface 210b on the -Z side. The first glass substrate 210 is formed of alkali-free glass, borosilicate glass, soda glass, etc. The thickness (length in the Z direction) T1 of the first glass substrate 210 is 0.5 mm or less. In this embodiment, the thickness T1 of the first glass substrate 210 located on the occupant side (+Z side) is thinner (0.5 mm or less), and therefore, the size of the scattering material (e.g., glass sheet) generated due to the breakage of the first glass substrate is smaller. Therefore, the lethality of the display device 10 is reduced.

[0048] The second glass substrate 220 of the protector 200 has a rectangular shape. The second glass substrate 220 is located between the first glass substrate 210 and the display surface 110a of the liquid crystal display panel 110. The second glass substrate 220 includes a first main surface 220a on the +Z side and a second main surface 220b on the -Z side. The second glass substrate 220 is formed of alkali-free glass, borosilicate glass, soda ash glass, etc. In one example, the thickness T2 of the second glass substrate 220 is 0.3 mm to 2.0 mm.

[0049] The first adhesive layer 230 of the protector 200 bonds the first glass substrate 210 and the second glass substrate 220 together. Specifically, the first adhesive layer 230 bonds the second main surface 210b of the first glass substrate 210 and the first main surface 220a of the second glass substrate 220 together. The first adhesive layer 230 is formed of polyvinyl acetal resin (e.g., polyvinyl butyral), acrylic resin, polyurethane resin, etc. In one example, the thickness T3 of the first adhesive layer 230 is 100 μm to 500 μm. In this embodiment, the impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220 is 7 to 10.

[0050] This section describes the impact value and impact test. The impact value is an index representing the adhesion between the glass substrate and the intermediate layer forming the laminated glass, and represents the adhesive force of the intermediate layer to the glass substrate. As the impact value increases, the adhesive force of the intermediate layer to the glass substrate increases. In this specification, the impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220 refers to the impact value of the laminate in which the first glass substrate 210 and the second glass substrate 220 are adhered to each other by the first adhesive layer 230. The impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220 is proportional to the shear strength of the first adhesive layer 230. Note that in this specification, the impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220 is also referred to as the impact value of the first adhesive layer 230.

[0051] The impact test is a measurement method used to measure the impact value. In the impact test of this embodiment, firstly, a laminate in which the first glass substrate 210 and the second glass substrate 220 are adhered to each other by the first adhesive layer 230 is placed at -18°C for 16 hours. Next, the laminate is placed on a steel plate tilted at 45° relative to the vertical direction, and then the laminate is struck with a hammer weighing 450g. The struck laminate is then observed, and the degree of exposure of the first adhesive layer 230 is compared with a predetermined limit sample to obtain the impact value of the first adhesive layer 230. In this embodiment, the relationship between the impact value and the degree of exposure of the first adhesive layer 230 is shown in Table 1 and conforms to the standard described in US Patent No. US3434915.

[0052] Table 1

[0053]

[0054]

[0055] In this embodiment, the first adhesive layer 230, which adheres the first glass substrate 210 and the second glass substrate 220 to each other, has a high impact value (from 7 to 10). Therefore, the display device 10 can reduce the amount of scattered material from the first glass substrate 210 due to impact and breakage of the protector 200. Furthermore, the display device 10 can prevent the sheet of the first glass substrate 210 from peeling off from the first adhesive layer 230 before the first glass substrate 210 breaks into smaller pieces. That is, when the sheet of the first glass substrate 210 peels off from the first adhesive layer 230, the first glass substrate 210 breaks into smaller pieces, and therefore, the display device 10 can reduce the size of the scattered material from the first glass substrate. Thus, the lethality of the display device 10 is reduced.

[0056] The second adhesive layer 240 of the protector 200 adheres the second glass substrate 220 and the liquid crystal display panel 110 to each other. Specifically, the second adhesive layer 240 adheres the second main surface 220b of the second glass substrate 220 and the display surface 110a of the liquid crystal display panel 110 to each other. The second adhesive layer 240 is formed of polyvinyl acetal resin, acrylic resin, polyurethane resin, etc. In one example, the thickness T4 of the second adhesive layer 240 is 100 μm to 500 μm. In this embodiment, the impact value of the second adhesive layer 240 on the second glass substrate 220 and the liquid crystal display panel 110 is less than or equal to the impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220. Note that the impact value of the second adhesive layer 240 on the second glass substrate 220 and the liquid crystal display panel 110 (hereinafter also referred to as the impact value of the second adhesive layer 240) refers to the impact value of the laminate in which the second glass substrate 220 and the liquid crystal display panel 110 are adhered to each other by the second adhesive layer 240. The measurement (impact test) of the impact value of the second adhesive layer 240 is the same as the measurement of the impact value of the first adhesive layer 230. The impact value of the second adhesive layer 240 is proportional to the shear strength of the second adhesive layer 240.

[0057] In this embodiment, the impact value of the second adhesive layer 240, which adheres the second glass substrate 220 (closer to the liquid crystal display panel 110 than the first glass substrate 210) to the liquid crystal display panel 110, is less than or equal to the impact value of the first adhesive layer 230, which adheres the first glass substrate 210 and the second glass substrate 220 to each other. Therefore, when the first glass substrate 210 is impacted and the protector 200 breaks, such as Figure 5 As shown, the second adhesive layer 240 is peeled off from the second glass substrate 220 and the liquid crystal display panel 110, and then stretched. As a result, the display device 10 can reduce the horizontal plane difference LD and the crack width CL of the protector 200 caused by impact to the first glass substrate 210 and breakage of the protector 200. Here, as... Figure 5 As shown, the horizontal plane difference LD of the protector 200 is the difference in height (length in the Z direction) of the first main surface 210a in the fractured first glass substrate 210. Furthermore, the crack width CL is the width between the first main surfaces 210a of the fractured first glass substrate 210 when the protector 200 is viewed from the occupant's side plane. Note that even when the second adhesive layer 240 breaks, the second adhesive layer 240 is stretched until it breaks, and therefore, the display device 10 can reduce the horizontal plane difference LD of the protector 200 and the crack width CL of the protector 200.

[0058] As described above, the thickness T1 of the first glass substrate 210 located on the occupant side is 0.5 mm or less, and therefore, the size of the scattered material generated due to the breakage of the display device 10 can be reduced. The impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220 is 7 to 10, and therefore, the display device 10 can reduce the amount and size of the scattered material from the first glass substrate 210. Therefore, the display device 10 can reduce the morbidity to the occupant.

[0059] Furthermore, the impact value of the second adhesive layer 240 is less than or equal to the impact value of the first adhesive layer 230, and therefore, the display device 10 can reduce the horizontal plane difference LD of the protector 200 and the width CL of the crack in the protector 200 caused by the breakage of the protector 200. Therefore, the display device 10 can further reduce its lethality to occupants.

[0060] Example 2

[0061] In Embodiment 1, the protector 200 includes a first glass substrate 210 to a second adhesive layer 240. One possible configuration is where the protector 200 includes the first glass substrate 210 to the second adhesive layer 240, a third glass substrate 250, and a third adhesive layer 260. The configuration of the display 100 in this embodiment is the same as that of the display 100 in Embodiment 1, and therefore, the protector 200 of this embodiment will be described.

[0062] like Figure 6 As shown, the protector 200 of this embodiment includes a first glass substrate 210, a second glass substrate 220, a first adhesive layer 230, a second adhesive layer 240, a third glass substrate 250, and a third adhesive layer 260. Except for the second adhesive layer 240 that adheres to the second glass substrate 220 and the third glass substrate 250, the first glass substrate 210 to the second adhesive layer 240 of this embodiment are the same as the first glass substrate 210 to the second adhesive layer 240 of Embodiment 1.

[0063] The third glass substrate 250 has a rectangular shape. The third glass substrate 250 is located between the second glass substrate 220 and the display surface 110a of the liquid crystal display panel 110. The third glass substrate 250 includes a first main surface 250a on the +Z side and a second main surface 250b on the -Z side. The third glass substrate 250 is formed of alkali-free glass, borosilicate glass, soda ash glass, etc. In one example, the thickness T5 of the third glass substrate 250 is 0.3 mm to 1.0 mm.

[0064] The third glass substrate 250 is adhered to the second glass substrate 220 via the second adhesive layer 240. Specifically, the first main surface 250a of the third glass substrate 250 and the second main surface 220b of the second glass substrate 220 are adhered to each other via the second adhesive layer 240. Similar to the impact value of the second adhesive layer 240 on the second glass substrate 220 and the liquid crystal display panel 110 in Embodiment 1, the impact value of the second adhesive layer 240 on the third glass substrate 250 and the second glass substrate 220 is less than or equal to the impact value of the first adhesive layer 230 on the first glass substrate 210 and the second glass substrate 220. Therefore, similar to the display device 10 of Embodiment 1, the display device 10 of this embodiment can reduce the horizontal plane difference LD of the protector 200 and the width CL of the crack in the protector 200 caused by the breakage of the protector 200.

[0065] The third adhesive layer 260 adheres the third glass substrate 250 and the liquid crystal display panel 110 to each other. Specifically, the third adhesive layer 260 adheres the second main surface 250b of the third glass substrate 250 and the display surface 110a of the liquid crystal display panel 110 to each other. In one example, the third adhesive layer 260 is formed of a transparent adhesive (e.g., optically clear adhesive (OCA), optically clear resin (OCR)), polyvinyl acetal resin, acrylic resin, etc. In one example, the thickness T6 of the third adhesive layer 260 is 0.5 mm to 1 mm.

[0066] In this embodiment, the adhesive used to form the third adhesive layer 260 can be selected based on the state and material of the display surface 110a of the liquid crystal display panel 110. Therefore, using the display device 10 of this embodiment, the protector 200 and the liquid crystal display panel 110 can adhere more firmly to each other. Furthermore, inconsistencies in the display of the display device 10 can be suppressed.

[0067] As described above, using the display device 10 of this embodiment, the protector 200 and the liquid crystal display panel 110 can adhere more firmly to each other. Furthermore, similar to the display device 10 of Embodiment 1, the display device 10 of this embodiment can reduce the size of the scattering material from the first glass substrate 210. The display device 10 of this embodiment can reduce the amount of scattering material from the first glass substrate 210. Furthermore, the display device 10 of this embodiment can reduce the horizontal plane difference LD of the protector 200 and the width CL of the crack in the protector 200 caused by breakage. Therefore, the display device 10 of this embodiment can reduce the fatality rate to occupants.

[0068] Example 3

[0069] In Embodiments 1 and 2, the protector 200 protects the liquid crystal display panel 110. One possible configuration is that the protector 200 protects the liquid crystal display panel 110 and also functions as a touch panel. In this embodiment, the second glass substrate 220 of the protector 200 functions as a touch panel. Except for the second glass substrate 220 of the protector 200, the configuration of the display device 10 in this embodiment is the same as that of the display device 10 in Embodiment 1. Therefore, the second glass substrate 220 of the protector 200 of this embodiment will be described herein.

[0070] In this embodiment, the second glass substrate 220 is used as a projection-type capacitive touch panel. For example... Figure 7 As shown, the second glass substrate 220 of this embodiment includes a plurality of driving electrodes 310 and a plurality of detection electrodes 320 in region 302 corresponding to the display area 111 of the liquid crystal display panel 110.

[0071] A driving electrode 310 is disposed on a first main surface 220a of the second glass substrate 220. The driving electrode 310 extends in the Y direction. The driving electrode 310 has a pattern in which the corners of a plurality of rectangles are connected in a row (so-called "diamond pattern"). Each driving electrode 310 is connected to a controller (not shown) via wiring 312.

[0072] A detection electrode 320 is disposed on the second main surface 220b of the second glass substrate 220. The detection electrode 320 extends in the X direction. The detection electrode 320 has a pattern in which the corners of a plurality of rectangles are connected in a row. Each of the detection electrodes 320 is connected to a controller via wiring 322.

[0073] In one example, the driving electrode 310 and the detection electrode 320 are formed of indium tin oxide (ITO). When viewed from above, the driving electrode 310 and the detection electrode 320 intersect at the corner joint of a rectangle. When a voltage is applied to the driving electrode 310, a capacitance is formed between the driving electrode 310, the detection electrode 320, and the occupant's indicator (finger, pen, etc.). The controller measures the formed capacitance, thereby enabling the detection of the position touched by the occupant's indicator (self-capacitance detection). Note that the detection method is not limited to self-capacitance detection, and mutual capacitance detection can also be used. Furthermore, the controller is configured with a central processing unit (CPU), driving circuitry, detection circuitry, etc.

[0074] As described above, the protector 200 (second glass substrate 220) of this embodiment serves as a touch panel. Furthermore, similar to the display device 10 of Embodiment 1, the size of the scattering material from the first glass substrate 210 can be reduced using the display device 10 of this embodiment. The amount of scattering material from the first glass substrate 210 can also be reduced using the display device 10 of this embodiment. Moreover, the horizontal plane difference LD of the protector 200 and the width CL of the crack in the protector 200 caused by breakage of the protector 200 can be reduced. Therefore, the mortal danger to occupants can be reduced using the display device 10 of this embodiment.

[0075] Modify Example

[0076] Embodiments have been described, but various modifications may be made to this disclosure without departing from the spirit and scope thereof.

[0077] For example, one configuration is possible in which the first glass substrate 210 is formed of tempered glass (e.g., chemically strengthened aluminosilicate glass). Therefore, the scattering material becomes smaller, and the display device 10 of this embodiment can be further reduced in its lethality to occupants.

[0078] One possible configuration is that the first main surface 210a of the first glass substrate 210 undergoes various types of treatment. For example, the first main surface 210a of the first glass substrate 210 may undergo a low-reflection treatment.

[0079] In one embodiment, the display 100 includes a liquid crystal display panel 110 and a backlight 120. However, a configuration is possible in which the display 100 includes a different display panel. For example, a configuration is possible in which the display 100 includes an organic electroluminescent (EL) display panel instead of the liquid crystal display panel 110 and the backlight 120.

[0080] In embodiment 2, it is preferable that the thickness T2 of the second glass substrate 220 is greater than the thickness T1 of the first glass substrate 210 and the thickness T5 of the third glass substrate 250.

[0081] In embodiment 3, the driving electrode 310 is disposed on the first main surface 220a of the second glass substrate 220, and the detection electrode 320 is disposed on the second main surface 220b of the second glass substrate 220. However, a configuration is possible in which the driving electrode 310 and the detection electrode 320 are disposed on one main surface of the second glass substrate 220. For example, a configuration is possible in which the driving electrode 310 and wiring 312 are disposed on the first main surface 220a of the second glass substrate 220, and the detection electrode 320 and wiring 322 are disposed on an insulating layer formed on the driving electrode 310 and the first main surface 220.

[0082] In Embodiment 3, the second glass substrate 220 of the protector 200 serves as a touch panel. However, a configuration is possible in which the first glass substrate 210 of Embodiment 1 or Embodiment 3, or the third glass substrate 250 of Embodiment 2, serves as the touch panel. For example, one possible configuration is in which the driving electrode 310 and wiring 312 are disposed on the first main surface 250a of the third glass substrate 250, and the detection electrode 320 and wiring 322 are disposed on the second main surface 250b of the third glass substrate 250.

[0083] One possible configuration is that the driving electrode 310 and wiring 312 are disposed on the second main surface 210b of the first glass substrate 210, and the detection electrode 320 and wiring 322 are disposed on the first main surface 220a of the second glass substrate 220. Another possible configuration is that the driving electrode 310 and wiring 312 are disposed on the second main surface 220b of the second glass substrate 220, and the detection electrode 320 and wiring 322 are disposed on the first main surface 250a of the third glass substrate 250.

[0084] In embodiment 3, the protector 200 is used as a capacitive touch panel. However, a configuration is possible in which the protector 200 is used as a different type of touch panel. For example, a configuration is possible in which the protector 200 is used as an ultrasonic touch panel. In this case, the transmitter and receiver (e.g., a piezoelectric transducer) are located at the corner of the first glass substrate 210. The transmitter propagates surface acoustic waves on the surface of the first glass substrate 210, and the receiver detects the contact position of the indicator based on the attenuation of the surface acoustic waves.

[0085] One possible configuration is in which the shape of the protector 200 is larger than the shape of the display 100. For example, as... Figure 8 As shown, one possible configuration is that the first glass substrate 210, the second glass substrate 220, and the first adhesive layer 230 of the protector 200 have a larger outline than the display 100.

[0086] Preferred embodiments of this disclosure have been described, but this disclosure should not be construed as limiting it to these specific embodiments. The scope of the invention is defined only by the included claims and the full scope of their equivalents.

[0087] Example

[0088] The present disclosure is described in further detail below using examples, but the disclosure is not limited to these examples.

[0089] Example 1

[0090] The display device 10 of Embodiment 2 was fabricated. A first glass substrate 210 is formed of alkali-free glass. The thickness T1 of the first glass substrate 210 is 0.15 mm, 0.33 mm, or 0.50 mm. A second glass substrate 220 is formed of soda-lime glass. The thickness T2 of the second glass substrate 220 is 1.1 mm. A third glass substrate 250 is formed of alkali-free glass. The thickness T5 of the third glass substrate 250 is 0.50 mm.

[0091] The first adhesive layer 230 is formed of polyvinyl butyral. The thickness T3 of the first adhesive layer 230 is 380 μm. The impact value of the first adhesive layer 230 is 9. The second adhesive layer 240 is formed of polyvinyl butyral. The thickness T4 of the second adhesive layer 240 is 380 μm. The impact value of the second adhesive layer 240 is 9. The third adhesive layer 260 is formed of OCR. The thickness T6 of the third adhesive layer 260 is 1035 μm.

[0092] In addition, a display device of Comparative Example 1 was fabricated. The thickness T1 of the first glass substrate 210 in the display device of Comparative Example 1 is 1.1 mm or 3.0 mm. Except for the thickness T1 of the first glass substrate, the configuration of the display device in Comparative Example 1 is the same as that of the display device 10 of this example.

[0093] An impact tester was used to impact the center of the first main surface 210a of the first glass substrate 210 of the display device 10 of this example or the display device of the comparative example at a speed of 24.1 km / h with a spherical impactor with a diameter of 165 mm and a weight of 6.8 kg. Then, a microscope was used to obtain the average maximum diameter LA of the scattered material generated by the impact of the impactor. Figure 9 As shown, the maximum diameter L of the scattering material is the longest width of the scattering material. The average maximum diameter LA of the scattering material is the average of the maximum diameters L of five to ten scattering materials. Furthermore, the horizontal plane difference LD and the crack width CL of the cracked display device 10 in this example and the cracked display device in the comparative example were measured using vernier calipers.

[0094] Figure 10 The relationship between the thickness T1 of the first glass substrate 210 and the average maximum diameter LA of the scattering material is shown. For example... Figure 10 As shown, the average maximum diameter LA of the scattering material generated by the display device 10 of this example is 1.0 mm or less, and therefore, the size of the scattering material generated by the display device 100 of this example is small. Meanwhile, the average maximum diameter LA of the scattering material generated by the display device of the comparative example is greater than 1.0 mm. Therefore, the display device 10 of this example can reduce the size of the scattering material and can reduce its lethality to occupants.

[0095] The horizontal plane difference LD of the display device 10 in this example, which cracks due to the impact of the impactor, is 1.0 mm or less. The crack width CL of the display device 10 in this example, which cracks due to the impact of the impactor, is 2.0 mm or less. Meanwhile, the horizontal plane difference LD of the display device in the comparative example, which cracks due to the impact of the impactor, is greater than 1.0 mm. The crack width CL of the display device in the comparative example, which cracks due to the impact of the impactor, is greater than 2.0 mm. Therefore, the display device 10 in this example can reduce the horizontal plane difference LD and the crack width CL of the protector 200, and can reduce the lethality to the occupant.

[0096] Example 2

[0097] The display device 10 of Example 2 was fabricated. The thickness T1 of the first glass substrate 210 is 0.33 mm or 0.50 mm. The impact value of the first adhesive layer 230 is 7 or 9. The impact value of the second adhesive layer 240 is the same as that of the first adhesive layer 230. The other configurations of the display device 10 in this example are the same as those of the display device 10 in Example 1.

[0098] A display device of Comparative Example 2 was manufactured. The thickness T1 of the first glass substrate 210 in the display device of Comparative Example 2 is 0.50 mm. The impact value of the first adhesive layer 230 and the second adhesive layer 240 is 5. Except for the thickness T1 of the first glass substrate 210 and the impact values ​​of the first adhesive layer 230 and the second adhesive layer 240, the configuration of the display device of Comparative Example 2 is the same as that of the display device 10 of this example.

[0099] As in Example 1, a spherical impactor is used to impact the center of the first main surface 210a of the first glass substrate 210 of the display device 10 of this example or the display device of Comparative Example 2, and the average maximum diameter LA of the scattering material is obtained.

[0100] Figure 11 The relationship between the impact value of the first adhesive layer 230 and the average maximum diameter LA of the scattering material is shown. For example... Figure 11 As shown, the average maximum diameter LA (impact value of the first adhesive layer 230: 7 or 9) of the scattering material generated by the display device 10 of this example is 1.0 mm or less, and therefore, the size of the scattering material is small. Meanwhile, the average maximum diameter LA (impact value of the first adhesive layer 230: 5) of the scattering material generated by the display device of Comparative Example 2 is greater than 1.0 mm. Therefore, by setting the impact value of the first adhesive layer to 7 to 10, the size of the scattering material can be reduced, and the lethality to occupants can be decreased.

[0101] Example 3

[0102] The display device 10 of Example 2 was fabricated. The thickness T1 of the first glass substrate 210 is 0.50 mm. The impact value of the first adhesive layer 230 is 9. The impact value of the second adhesive layer 240 is 9 or 7. The other configurations of the display device 10 in this example are the same as those of the display device in Example 1.

[0103] Similar to Example 1, a spherical impactor is used to impact the center of the first main surface 210a of the first glass substrate 210 of the display device 10 of this example, and the horizontal plane difference LD is measured.

[0104] Figure 12 The relationship between the impact value of the second adhesive layer 240 and the horizontal plane difference LD is shown. For example... Figure 12 As shown, in the display device 10 where the impact value of the first adhesive layer 230 and the impact value of the second adhesive layer 240 are set to 9, and in the display device 10 where the impact value of the first adhesive layer 230 is set to 9 and the impact value of the second adhesive layer 240 is set to 7, the horizontal plane difference LD is 1.0 mm or less. Therefore, by setting the impact value of the second adhesive layer 240 to be less than or equal to the impact value of the first adhesive layer 230, the horizontal plane difference LD can be reduced, and the lethality to occupants can be decreased.

[0105] Example 4

[0106] A display device 10 according to Embodiment 2 was fabricated. In this example display device 10, the outer dimensions of the first glass substrate 210, the second glass substrate 220, and the first adhesive layer 230 of the protector 200 are larger than the outer dimensions of the display 100. The thickness T1 of the first glass substrate 210 and the thickness T5 of the third glass substrate 250 are 0.50 mm. The thickness T2 of the second glass substrate 220 is 1.1 mm. That is, in this example display device 10, the thickness T2 of the second glass substrate 220 located between the first glass substrate 210 and the third glass substrate 250 is greater than the thickness T1 of the first glass substrate 210 and the thickness T5 of the third glass substrate 250. The other configurations of this example display device 10 are the same as those of the display device 10 of Embodiment 1.

[0107] The display device 10 of this example is fixed to a fixture 520 that mimics a vehicle dashboard. Under the conditions of the impact resistance test in the test method for vehicle safety glass of JIS Regulation JIS R3212:2015 (ISO Regulation ISO 3528.1997), a steel ball impact is applied to the center of the first main surface 210a of the first glass substrate 210 of the display device 10 fixed to the fixture 520.

[0108] Specifically, such as Figure 13As shown, in this example, the display device 10 is fixed to the opening portion 522 of the clamp 520. The second glass substrate 220 is adhered to the side wall of the clamp 520 by double-sided tape 532, and the bottom of the chassis 132 is adhered to the open bottom plate of the clamp 520 by double-sided tape 534. In this example, a steel ball with a smooth surface, a mass of 227g ± 2g, and a diameter of approximately 38mm is dropped freely from a height of 9m onto the center of the first main surface 210a of the first glass substrate 210. Note that from Figure 13 The first adhesive layer 230, the second adhesive layer 240, etc. are omitted.

[0109] Due to the impact of the steel ball, the second glass substrate 220 fractures, but the first glass substrate 210 and the third glass substrate 250 do not fracture. By setting the thickness T2 of the second glass substrate 220 located between the first glass substrate 210 and the third glass substrate 250 to be greater than the thickness T1 of the first glass substrate 210 and the thickness T5 of the third glass substrate 250, it can be considered that the stress caused by the impactor being concentrated in the second glass substrate 220 and the stress applied to the first glass substrate 210 and the third glass substrate 250 are reduced, and the fracture of the first glass substrate 210 and the third glass substrate 250 is suppressed. Since the fracture of the first glass substrate 210 located on the occupant side and the third glass substrate 250 located on the display 100 side is suppressed, the display device 10 of this example can suppress the scattering of fragments and can further reduce the lethality to the occupant.

[0110] As described above, it is preferable that the thickness T2 of the second glass substrate 220 is greater than the thickness T1 of the first glass substrate 210 and the thickness T5 of the third glass substrate 250.

[0111] Some exemplary embodiments have been described above for illustrative purposes. Although specific embodiments have been given in the foregoing discussion, those skilled in the art will recognize that changes in form and detail may be made without departing from the broader spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive. Consequently, this detailed description should not be regarded as limiting, and the scope of the invention is defined only by the included claims and the full scope of their equivalents.

Claims

1. A display device, comprising: Display panel; as well as A protector is disposed on the display surface of the display panel, wherein The protector includes a first glass substrate located on the user side, a second glass substrate located between the first glass substrate and the display surface, a first adhesive layer for adhering the first glass substrate and the second glass substrate to each other, and a second adhesive layer for adhering the second glass substrate and the display panel to each other. The thickness of the first glass substrate is 0.5 mm or less. The first adhesive layer has a strike value of 7 to 10, and the second adhesive layer has a strike value less than or equal to the strike value of the first adhesive layer.

2. The display device according to claim 1, wherein, The protector is a touch panel that detects the contact position on the first glass substrate.

3. A display device, comprising: Display panel; as well as A protector is disposed on the display surface of the display panel, wherein The protector includes a first glass substrate located on the user side, a second glass substrate located between the first glass substrate and the display surface, and a third glass substrate located between the second glass substrate and the display surface, a first adhesive layer for adhering the first glass substrate and the second glass substrate to each other, a second adhesive layer for adhering the second glass substrate and the third glass substrate to each other, and a third adhesive layer for adhering the third glass substrate and the display panel to each other. The thickness of the first glass substrate is 0.5 mm or less. The thickness of the third glass substrate is greater than the thickness of the first glass substrate. The thickness of the second glass substrate is greater than the thickness of the third glass substrate. The first adhesive layer has a strike value of 7 to 10, and The impact value of the second adhesive layer is less than or equal to the impact value of the first adhesive layer.

4. The display device according to claim 3, wherein, The protector is a touch panel that detects the contact position on the first glass substrate.

5. The display device according to any one of claims 1 to 4, wherein, The first glass substrate is formed of tempered glass.

6. The display device according to any one of claims 1 to 4, wherein, At least one of the first adhesive layer or the second adhesive layer is formed of polyvinyl butyral.

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