Display device

Abstract

To provide technology that makes it possible to appropriately paste a liquid crystal display panel and a cover panel together.SOLUTION: A display device comprises: a liquid crystal display panel; a transparent optical material located on the display surface side of the liquid crystal display panel; a cover panel which is pressurized in a direction to become closer in distance to the liquid crystal display panel across the optical material and pasted to the liquid crystal display panel; a structure material at least part of which is located to the liquid crystal display panel on the side opposite the cover panel; a first elastic material that connects a rear face of the liquid crystal display panel on the side opposite the display surface and a mounting face on the liquid crystal display panel side of the structural material; and a second elastic material which is located between the liquid crystal display panel and the structural material, and which has a larger elastic modulus than the first elastic material and a smaller thickness in the cover panel pressurization direction than the first elastic material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a display device.

Background Art

[0002] In recent years, liquid crystal display devices equipped with liquid crystal display panels have become widely popular. In a liquid crystal display panel, elements such as liquid crystal, transparent electrodes, color filters, and retardation filters are formed in a thin layer, for example. Therefore, when the liquid crystal display panel is locally fixed to a structural material such as a housing, it may be distorted by heat, its own weight, vibration, etc. during display, and color unevenness may occur due to contact and stress with each element. For this reason, in a liquid crystal display device, a configuration may be adopted in which a cushioning material is interposed between the liquid crystal display panel and the structural material for holding.

[0003] Patent Document 1 describes a liquid crystal display device including a liquid crystal display panel provided with a first rubber cushion fixed so as to surround a display area, and a frame provided with a second rubber cushion fixed so as to surround the display area of the liquid crystal display panel. In the liquid crystal display device of Patent Document 1, by arranging the first rubber cushion and the second rubber cushion adjacent to each other without overlapping when viewed in a plane, stress for fixing the liquid crystal display panel is avoided, and dust from entering between the liquid crystal display panel and the frame is also avoided.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When a cover panel is bonded with a transparent material interposed on the display surface side of a liquid crystal display panel, if the cover panel is pressed toward the liquid crystal display panel and brought closer to the liquid crystal display panel, an elastic material (cushion material) for preventing color unevenness of the liquid crystal display panel shrinks, so that the liquid crystal display panel and the cover panel may not be sufficiently pressed, and there has been a problem that the liquid crystal display panel and the cover panel may not be bonded properly.

[0006] The technology of the present disclosure aims to provide a technology capable of properly bonding a liquid crystal display panel and a cover panel.

Means for Solving the Problem

[0007] To solve the above problems, the display device of the present disclosure includes: a liquid crystal display panel; a transparent optical material disposed on the display surface side of the liquid crystal display panel; a cover panel that sandwiches the optical material and is pressed in a direction in which the distance from the liquid crystal display panel decreases to be bonded to the liquid crystal display panel; a structural member at least a part of which is disposed on the side opposite to the cover panel with respect to the liquid crystal display panel; a first elastic member that connects the back surface on the side opposite to the display surface of the liquid crystal display panel and the mounting surface on the liquid crystal display panel side of the structural member; a second elastic member that is disposed between the liquid crystal display panel and the structural member, has a higher elastic modulus than the first elastic member, and has a smaller thickness in the pressing direction of the cover panel than the first elastic member; and includes the above.

[0008] Thereby, the display device of the present disclosure holds the liquid crystal display panel by the first elastic member so that color unevenness does not occur, and at the time of bonding, the second elastic member receives the liquid crystal display panel, suppresses the liquid crystal display panel from sinking more than necessary, and enables the liquid crystal display panel and the cover panel to be sufficiently pressed so that the liquid crystal display panel and the cover panel can be bonded properly.

Effects of the Invention

[0009] According to the technology of the present disclosure, it is possible to provide a technology capable of appropriately bonding a liquid crystal display panel and a cover panel.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

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Figure 10

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configurations of the following embodiments are examples, and the present invention is not limited to the configurations of the embodiments.

[0012] <First Embodiment> FIG. 1 is a diagram showing a cross-sectional configuration of a display device 1 according to the present embodiment. The display device 1 includes a cover glass 10, an adhesive 20, a liquid crystal display panel 30, a backlight 40, a housing 50, and a cushioning material 60. FIG. 2 is an exploded perspective view showing the cover glass 10, the adhesive 20, the liquid crystal display panel 30, and the backlight 40.

[0013] In FIG. 1, the housing 50 is an outer package of the device that houses the cover glass 10, the adhesive 20, the liquid crystal display panel 30, and the backlight 40. The housing 50 is not particularly limited in terms of material, but is formed of, for example, metal or plastic. By attaching the housing 50 to a target position such as a vehicle, the display device 1 is fixed with the display surface facing the user's viewing position side.

[0014] The backlight 40 includes a backlight front case 41, an optical member unit 42, and a backlight rear case 43. The backlight rear case 43 is made of a metal such as steel material or stainless steel, and has a box shape capable of housing the optical member unit 42. The optical member unit 42 includes a light source such as a cold cathode ray tube or an LED, a light guide plate, a diffusion plate, various lens sheets, etc., emits light from the light emitting surface 421, and illuminates the liquid crystal display panel 30 from the back. The backlight front case 41 is attached to the back light rear case 43 from the front side of the optical member unit 42 to form the case of the backlight 40. The backlight front case 41 is a frame-shaped member having an opening 411 in the central region corresponding to the display region of the liquid crystal display panel 30. The backlight front case 41 and the backlight rear case 43 are connected to the housing 50 and are fixed to the position via the housing 50 when the housing 50 is attached to the target position. In the present embodiment, the backlight front case 41, the backlight rear case 43, and the housing 50 are a form of a structural material that protects and holds the cover glass 10, the adhesive 20, the liquid crystal display panel 30, and the optical member unit 42 to be housed.

[0015] The liquid crystal display panel 30 includes a display element 31 and a control circuit 32. The control circuit 32 receives an image signal from another device and controls the display element to display an image based on the image signal. The display element 31 includes, for example, a polarizing panel, liquid crystal, transparent electrodes, color filters, etc., and the transmittance of pixels arranged in a matrix is controlled according to a control signal from the control circuit 32. Thereby, the display element 31 displays a color image by changing the ratio of the light from the backlight 40 passing through color filters such as RGB in each pixel. Further, the liquid crystal display panel 30 may include a touch panel on the display surface side.

[0016] The cover glass (cover panel) 10 is a plate-like member that protects the liquid crystal display panel 30. The cover glass 10 is not limited to glass and may be formed of plastic. At least the central region 11 corresponding to the display region of the liquid crystal display panel 30 is formed to be transparent in the cover glass 10. Further, the cover glass 10 of the present embodiment has a frame-shaped light-shielding portion 12 that does not transmit light outside the region 11.

[0017] The adhesive 20 is a form of an optical material that bonds the liquid crystal display panel 30 and the cover glass 10. The adhesive 20 is a material containing acrylic or silicone and has a refractive index close to that of the member on the display surface side of the cover glass 10 and the liquid crystal display panel 30. The adhesive 20 is, for example, liquid or gel-like before bonding, and may be an ultraviolet curable resin or a thermosetting resin that cures by ultraviolet light or heat when bonding the liquid crystal display panel 30 and the cover glass 10. Not limited to this, the adhesive 20 may be a sheet-like member with an adhesive applied to the sheet. The specific bonding method will be described later.

[0018] In order to protect the liquid crystal display panel 30, a cover glass 10 is disposed on the display surface 311 side of the liquid crystal display panel 30. When an air gap is formed between the liquid crystal display panel 30 and the cover glass 10, blurring of the image and a decrease in luminance may occur due to the difference in refractive index between the cover glass 10 and the members on the display surface side of the liquid crystal display panel 30 and the air gap, resulting in a deterioration of the optical performance. Therefore, in the present embodiment, the liquid crystal display panel 30 and the cover glass 10 are bonded together with an adhesive 20 interposed therebetween, thereby preventing a deterioration of the optical performance due to the air gap.

[0019] FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1, and FIG. 4 is a view when looking in the direction of arrow 73 in FIG. 3 in the vicinity of the mounting position of the cushioning material 60.

[0020] In FIG. 3, the backlight front case 41 is provided with an opening 411 at a position corresponding to the display area of the liquid crystal display panel 30 so as to allow the light emitted from the optical member unit 42 to pass through. And a cushioning material 60 is provided along the outer periphery of the opening 411 on the mounting surface 412 of the backlight front case 41 surrounding the opening 411. The cushioning material 60 of the present embodiment includes a first cushioning material (first elastic material) 61 and a second cushioning material (second elastic material) 62, and the first cushioning material 61 and the second cushioning material 62 are alternately arranged along the outer periphery of the opening 411. In other words, the first cushioning material 61 and the second cushioning material 62 are alternately arranged along the outer edge of the liquid crystal display panel 30. Note that the cushioning material 60 is not limited to the two types of the first cushioning material 61 and the second cushioning material 62, and may include a plurality of elastic materials. It is okay.

[0021] The first cushioning material 61 connects the back surface 312 of the liquid crystal display panel 30 on the side opposite to the display surface 311 and the mounting surface 412 on the liquid crystal display panel side of the backlight front case 41. That is, the liquid crystal display panel 30 is held by the backlight front case 41 via the first cushioning material 61. Further, in the backlight front case 41, a side wall 413 surrounding the outer periphery of the liquid crystal display panel 30 is provided outside the mounting surface 412.

[0022] The first cushioning material 61 is set to have an elastic modulus suitable for holding the liquid crystal display panel 30 under normal conditions. Here, the normal conditions refer to, for example, when the cover glass 10 and the liquid crystal display panel 30 are not being pressurized for bonding. The elastic modulus of the first cushioning material 61 is set such that when a force in the direction of bringing the cover glass 10 closer to the liquid crystal display panel 30 (hereinafter also simply referred to as the pressing force) is applied during the bonding of the cover glass 10 and the liquid crystal display panel 30, the force with which the entire first cushioning material 61 pushes back the liquid crystal display panel 30 (hereinafter also simply referred to as the elastic force) is smaller than the pressing force. That is, when the pressing force is applied to the cover glass 10, the first cushioning material 61 contracts and the liquid crystal display panel 30 and the cover glass 10 are moved toward the backlight front case 41 side. If a first cushioning material 61 with an elastic modulus such that the elastic force of the first cushioning material 61 opposes the pressing force and the liquid crystal display panel 30 and the cover glass 10 do not move is adopted, the elastic modulus of the first cushioning material 61 will become too large. If such a first cushioning material 61 with a large and hard elastic modulus is adopted, the force for holding the liquid crystal display panel 30 will become too large locally, and color unevenness may be caused by stress such as heat during use. On the other hand, if the elastic modulus of the first cushioning material 61 is too small, it will be difficult to absorb vibrations during use. Therefore, the elastic modulus of the first cushioning material 61 is appropriately set according to the area for receiving the liquid crystal display panel 30, the pressing force during pressing, the use environment (such as whether it is mounted on a vehicle or not), etc.

[0023] The second cushioning material 62 is disposed between the liquid crystal display panel 30 and the backlight front case 41 in the pressing direction 71, and the thickness H2 of the cover glass 10 in the pressing direction 71 is formed to be thinner than the thickness H1 of the first cushioning material 61. Therefore, normally, the front end portion 621 of the second cushioning material 62 is separated from the liquid crystal display panel 30. When the cover glass 10 is pressed during bonding and the liquid crystal display panel 30 moves toward the backlight front case 41 side, the front end portion 621 receives the vicinity of the outer edge of the liquid crystal display panel 30. At this time, the elastic modulus of the second cushioning material 62 is set so that the force (elastic force) for pushing back the liquid crystal display panel 30 by the entire second cushioning material 62 opposes the pressing force. That is, the elastic modulus of the second cushioning material 62 is set to be larger than that of the first cushioning material 61. In the present embodiment, the second cushioning material 62 is connected to the backlight front case 41, but not limited thereto, the front end portion 621 of the second cushioning material 62 may be connected to the back surface 312 of the liquid crystal display panel 30, and the rear end portion of the second cushioning material 62 may be separated from the backlight front case 41. The first cushioning material (first elastic material) 61 and the second cushioning material (second elastic material) 62 may both be double-sided tapes. For example, the front end portions 611 and 621 and the rear end portions 612 and 622 of the first cushioning material 61 and the second cushioning material 62 may be adhesive surfaces, and the backlight front case 41 may be attached to the mounting surface 412 by the adhesive surfaces of the rear end portions 612 and 622. Further, the first cushioning material 61 may be attached to the back surface 312 of the liquid crystal display panel 30 by the adhesive surface of the front end portion 611. Note that the second cushioning material 62 may be configured to have an adhesive surface only at the rear end portion 622.

[0024] FIG. 5 is an explanatory diagram of a method of bonding the cover glass 10 and the liquid crystal display panel 30. First, in step A, the first cushioning material 61 and the second cushioning material 62 are connected to the mounting surface 412 of the backlight front case 41 in the backlight 40.

[0025] In Step B, the front end portion 611 of the first cushioning material 61 is connected to the back surface 312 of the liquid crystal display panel 30, and the liquid crystal display panel 30 is held by the backlight front case 41 via the first cushioning material 61.

[0026] In Step C, uncured adhesive 20 is applied to the display surface 311 of the liquid crystal display panel 30.

[0027] In Step D, the cover glass 10 is disposed opposite to the liquid crystal display panel 30 with the adhesive 20 therebetween and is pressed toward the liquid crystal display panel 30 side. Note that the backlight 40 is placed on a stand or the like and held so that the liquid crystal display panel 30 does not move in the pressing direction. In this case, due to the pressing force applied to the cover glass 10, the first cushioning material 61 is compressed, and the cover glass 10 and the liquid crystal display panel 30 move toward the backlight front case 41 side. Then, the second cushioning material 62 starts to be pressed, and the liquid crystal display panel 30 is held by the second cushioning material 62 at a position where the elastic force of the second cushioning material 62 counteracts the pressing force. In this way, the cover glass 10 and the liquid crystal display panel 30 are bonded with the adhesive 20 therebetween by the elastic force of the second cushioning material 62 and the pressing force applied to the cover glass 10.

[0028] In Step E, heat or ultraviolet rays are applied to the adhesive 20 to cure the adhesive 20 and fix the bonding between the cover glass 10 and the liquid crystal display panel 30. Note that when a sheet-like adhesive 20 is used, Step E may be omitted.

[0029] FIG. 6 is a diagram showing the state before pressing and the state during pressing in the comparative example. The comparative example in FIG. 6 is different in configuration from the present embodiment in that no second cushioning material 62 is used, and only the first cushioning material 61 is disposed as the cushioning material 60 between the liquid crystal display panel 30 and the backlight front case 41.

[0030] As shown in FIG. 6, in the comparative example, the first cushioning material 61 holds the liquid crystal display panel 30 in the same manner as in the present embodiment. When the cover glass 10 is pressed for bonding the cover glass 10 and the liquid crystal display panel 30, in the comparative example, since there is no second cushioning material 62, the liquid crystal display panel 30 and the cover glass 10 are pushed further into the backlight front case 41 side than in the present embodiment, and the cover glass 10 hits against the side wall 413 of the backlight front case 41, for example, so that the pressing force is not sufficiently transmitted to the cover glass 10, and the bonding between the cover glass 10 and the liquid crystal display panel 30 may not be properly performed.

[0031] On the other hand, in the present embodiment, as in step D of FIG. 5, the second cushioning material 62 is provided between the liquid crystal display panel 30 and the backlight front case 41, and when the cover glass 10 is pressed, the liquid crystal display panel 30 is held by the second cushioning material 62 at a position where the elastic force of the second cushioning material 62 counteracts the pressing force. Thereby, it is possible to prevent the cover glass 10 from interfering with members such as the side wall 413, and the bonding between the cover glass 10 and the liquid crystal display panel 30 is properly performed.

[0032] <Effect of the Embodiment> (1) The display device 1 of the present embodiment includes a second cushioning material 62 having a higher elastic modulus than the first cushioning material 61 and a smaller thickness in the pressing direction 71 of the cover glass 10 than the first cushioning material 61 between the liquid crystal display panel 30 and the backlight front case 41. Thereby, the display device 1 of the present embodiment holds the liquid crystal display panel 30 by the first cushioning material 61 so that color unevenness does not occur, and at the time of bonding, the second cushioning material 62 receives the liquid crystal display panel 30 and suppresses the liquid crystal display panel 30 from sinking more than necessary, so that the bonding between the liquid crystal display panel 30 and the cover glass 10 can be properly performed. Yes.

[0033] (2) The display device 1 is configured such that the first cushioning material 61 and the second cushioning material 62 are alternately arranged along the outer edge of the liquid crystal display panel 30 on the back surface 312 of the liquid crystal display panel 30 or the mounting surface 412 of the backlight front case 41. Thereby, the liquid crystal display panel 30 can disperse the force by which it is normally held by the first cushioning material 61 and the pressing force during bonding, suppressing the occurrence of color unevenness and the concentration of stress.

[0034] (3) The display device 1 is configured such that the elastic force of the first cushioning material 61 that pushes back the liquid crystal display panel 30 during pressurization is smaller than the pressing force during bonding. In this way, by adopting the first cushioning material 61 with a small elastic force and being soft, the display device 1 suppresses the concentration of stress on the liquid crystal display panel 30 held via the first cushioning material 61, preventing the occurrence of color unevenness.

[0035] (4) The display device 1 includes a side wall 413 of the backlight front case 41 that surrounds the outer peripheral surface of the liquid crystal display panel 30. Thereby, the display device 1 prevents the liquid crystal display panel 30 connected to the first cushioning material 61 from dropping sideways when it is subjected to impact or vibration. Also, even when the backlight front case 41 has the side wall 413 in this way, when the cover glass 10 and the liquid crystal display panel 30 are bonded, the second cushioning material 62 receives the movement of the liquid crystal display panel 30 so that the cover glass 10 does not interfere with the side wall 413. For this reason, the display device 1 can appropriately bond the cover glass 10 and the liquid crystal display panel 30.

[0036] <Modification Example> FIG. 7 is a diagram showing a modification example of the first embodiment. This modification example has a different configuration in that it includes a third cushioning material 63 compared to the above-described first embodiment. Since the other configurations are the same as those of the first embodiment, the same reference numerals are given to the same elements, and repeated description is omitted.

[0037] In this modification example, a cushioning material 60 provided between the liquid crystal display panel 30 and the backlight front case 41 includes a third cushioning material (third elastic material) 63 in addition to the first cushioning material 61 and the second cushioning material 62.

[0038] The third cushioning material 63 is formed of a material having a thickness and an elastic modulus in the pressing direction 71 different from those of the first cushioning material 61 and the second cushioning material 62. For example, the third cushioning material 63 of this modification example has a larger elastic modulus than the first cushioning material 61 and a thinner thickness in the pressing direction 71 than the first cushioning material 61, and has a smaller elastic modulus than the second cushioning material 62 and a thicker thickness in the pressing direction 71 than the second cushioning material 62.

[0039] Also, the third cushioning material 63 includes a plurality of types of elastic materials (third cushioning materials 631, 632) having different combinations of thickness and elastic modulus in the pressing direction 71. The third cushioning material 631 has a smaller elastic modulus than the third cushioning material 632, and is formed with a thickness H31 in the pressing direction 71 thicker than the thickness H32 of the third cushioning material 632. That is, when the thicknesses of the first cushioning material 61, the second cushioning material 62, and the third cushioning materials 631, 632 are H1, H2, H31, and H32, respectively, H1 > H31 > H32 > H2. Also, when the elastic moduli of the first cushioning material 61, the second cushioning material 62, and the third cushioning materials 631, 632 are E1, E2, E31, and E32, respectively, E1 < E31 < E32 < E2.

[0040] Note that the third cushioning material 63 may not have a plurality of combinations of thickness and elastic modulus, but may be a single cushioning material. Also, the third cushioning material 63 may include cushioning materials having three or more combinations of thickness and elastic modulus.

[0041] According to this modified example, since the display device 1 includes the third cushioning material 63 having an elastic modulus and thickness different from those of the first cushioning material 61 and the second cushioning material 62, even when the cover glass 10 is pressurized with a pressure different from that during bonding in a process other than the bonding process, the third cushioning material 63 can receive the liquid crystal display panel 30 with an appropriate elastic force.

[0042] <Second Embodiment> FIG. 8 is a diagram showing the vicinity where the cushioning material 60A of the display device 1A according to the second embodiment is provided. The second embodiment is different from the above-described first embodiment in that the first cushioning material 61 and the second cushioning material 62 are arranged so as to overlap in the pressing direction 71. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same elements, and repeated description is omitted.

[0043] In the cushioning material 60A of the present embodiment, the front end portion 611 of the first cushioning material 61 is connected to the back surface 312 of the liquid crystal display panel 30, and the rear end portion 612 of the first cushioning material 61 is connected to the front end portion 621 of the second cushioning material 62. Further, the cushioning material 60A connects the rear end portion 622 of the second cushioning material 62 to the mounting surface 412 of the backlight front case 41. Note that the arrangement of the first cushioning material 61 and the second cushioning material 62 may be reversed. That is, the front end portion 621 of the second cushioning material 62 may be connected to the back surface 312 of the liquid crystal display panel 30, the rear end portion 622 of the second cushioning material 62 may be connected to the front end portion 611 of the first cushioning material 61, and the rear end portion 612 of the first cushioning material 61 may be connected to the mounting surface 412 of the backlight front case 41. For example, when both the first cushioning material 61 and the second cushioning material 62 are double-sided tapes and the front end portions 611, 621 and the rear end portions 612, 622 are adhesive surfaces, the front end portion 611 of the first cushioning material 61 is connected to the back surface 312 of the liquid crystal display panel 30 by this adhesive surface, the rear end portion 612 of the first cushioning material 61 and the front end portion 621 of the second cushioning material 62 are connected, and the rear end portion 622 of the second cushioning material 62 is connected to the mounting surface 412 of the backlight front case 41.

[0044] FIG. 9 is a diagram showing the state before pressurization and the state during pressurization when the cover glass 10 and the liquid crystal display panel 30 are bonded together in the second embodiment.

[0045] In this embodiment, the liquid crystal display panel 30 is held by the backlight front case 41 via the cushion material 60A in which the first cushion material 61 and the second cushion material 62 are stacked. In this way, by interposing the soft first cushion material 61 between the liquid crystal display panel 30 and the backlight front case 41, the concentration of stress on the liquid crystal display panel 30 is suppressed, and color shift is suppressed.

[0046] When the cover glass 10 is pressurized in the pressurization direction 71 for bonding the cover glass 10 and the liquid crystal display panel 30, the first cushion material 61 is compressed, and the cover glass 10 and the liquid crystal display panel 30 move toward the backlight front case 41 side. At this time, since the second cushion material 62 is set to have a high elastic modulus, it suppresses the movement of the cover glass 10 and the liquid crystal display panel 30. In the state during pressurization in FIG. 9, the state in which the liquid crystal display panel 30 is received by the cushion material 60A at a position where the elastic force of the cushion material 60A including the second cushion material 62 opposes the pressure is shown.

[0047] As shown in FIG. 9, according to this embodiment, in a state where the cover glass 10 is pressurized for bonding, the cover glass 10 is received by the cushion material 60A in front of the side wall 413. This prevents the cover glass 10 from interfering with the side wall 413, and the cover - The bonding between the glass 10 and the liquid crystal display panel 30 is appropriately performed.

[0048] <Modification> FIG. 10 is a diagram showing a modification of the second embodiment. This modification is different in configuration from the above-described second embodiment in that it includes a third cushion material 63. Since the other configurations are the same as those of the second embodiment, the same reference numerals are given to the same elements, and the description will not be repeated.

[0049] In this modified example, a cushion material 60B provided between the liquid crystal display panel 30 and the backlight front case 41 includes a third cushion material 63 between a first cushion material 61 and a second cushion material 62.

[0050] The third cushion material 63 is formed of a material having an elastic modulus different from those of the first cushion material 61 and the second cushion material 62. For example, the third cushion material 63 of this modified example is formed of a material having a larger elastic modulus than the first cushion material 61 and a smaller elastic modulus than the second cushion material 62. The third cushion material 63 is not limited to one, and a plurality of them may be provided with different elastic moduli.

[0051] Thus, according to this modified example, since the display device 1 includes the third cushion material 63 having an elastic modulus different from those of the first cushion material 61 and the second cushion material 62, even when the cover glass 10 is pressurized with a pressure different from that during bonding in a process other than the bonding process, the cushion material 60A can receive the liquid crystal display panel 30 with an appropriate elastic force.

Description of Reference Numerals

[0052] 1, 1A: Display device 6: Second cushion material 10: Cover glass 11: Region 12: Light-shielding portion 20: Adhesive 30: Liquid crystal display panel 31: Display element 32: Control circuit 40: Backlight 41: Backlight front case 42: Optical member unit 43: Backlight rear case 50: Housing 60, 60A, 60B: Cushion material 61: First cushion material 62: Second cushion material 63(631, 632): Third cushion material 71: Pressing direction 311: Display surface 312: Back surface 411: Opening 412: Mounting surface 413: Side wall 421: Light emitting surface 611: Front end 612: Rear end 621: Front end 622: Rear end H1: Thickness H2: Thickness H31: Thickness

Claims

1. A liquid crystal display panel, a transparent optical material disposed on the display surface side of the liquid crystal display panel, a cover panel that sandwiches the optical material and is pressed in a direction in which the distance from the liquid crystal display panel decreases to be bonded to the liquid crystal display panel, a structural material at least a part of which is disposed on the side opposite to the cover panel with respect to the liquid crystal display panel, a first elastic material that connects the back surface on the side opposite to the display surface of the liquid crystal display panel and the mounting surface on the liquid crystal display panel side of the structural material, a second elastic material disposed between the liquid crystal display panel and the structural material, having a larger elastic modulus than the first elastic material, and having a thickness in the pressing direction of the cover panel thinner than that of the first elastic material, A display device comprising the above.

2. The display device according to claim 1, wherein the first elastic material and the second elastic material are alternately arranged along the outer edge of the liquid crystal display panel on the back surface of the liquid crystal display panel or the mounting surface of the structural material.

3. The display device according to claim 1, further comprising a third elastic material disposed between the liquid crystal display panel and the structural material, having a larger elastic modulus than the first elastic material and a thickness in the pressing direction of the cover panel thinner than that of the first elastic material, and having a smaller elastic modulus than the second elastic material and a thickness in the pressing direction of the cover panel thicker than that of the second elastic material.

4. The display device according to claim 3, comprising a plurality of the third elastic materials having at least one of different elastic moduli and thicknesses.

5. A liquid crystal display panel, a transparent optical material disposed on the display surface side of the liquid crystal display panel, a cover panel that sandwiches the optical material and is pressed in a direction in which the distance from the liquid crystal display panel decreases to be bonded to the liquid crystal display panel, a structural material at least a part of which is disposed on the side opposite to the cover panel with respect to the liquid crystal display panel, a plurality of elastic materials having different elastic moduli, provided in an overlapping manner in the pressing direction of the cover panel between the liquid crystal display panel and the structural material, A display device comprising the above.

6. The plurality of elastic materials are a first elastic material disposed between the liquid crystal display panel and the structural material, a second elastic material disposed between the liquid crystal display panel and the structural material in the pressing direction of the cover panel, overlapping the first elastic material, and having a larger elastic modulus than the first elastic material, The display device according to claim 5, comprising the above.

7. The display device according to any one of claims 1 to 4 and 6, wherein the elastic force of the first elastic material with respect to the liquid crystal display panel is configured to be smaller than the pressing force during bonding.

8. The display device according to any one of claims 1 to 6, wherein the structural material includes side walls surrounding the outer peripheral surface of the liquid crystal display panel.

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