Composite, method for manufacturing the same, and display device.

Abstract

To stably bond a resin molded body without causing undulation to appear on the surface of a display panel when a resin molded body with a moderate hardness, such as a joint part for fixing to a casing, is integrally installed on a back side of a thin glass display panel.SOLUTION: A resin molded body 3 installed on a back side of a glass substrate 2, a base part 32 made of a thermoplastic elastomer layer and placed on a junction to the glass substrate 2, and a main body part 31 made of a resin material with a large contraction force at the time of molding and superimposed on the base part, are integrally molded. Placing the base part 32 on the junction reduces a compression force of the resin at the time of molding to suppress the occurrence of sink marks and undulation on a front side of the glass substrate 2.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a composite of glass and a resin member, which is used for a display panel of a device that displays information and images such as car navigation.

Background Art

[0002] As display panels for devices that display various information and images, there are those made of synthetic resin and those made of glass. However, in high-end devices, glass-made panels are often used because the glossy panel texture creates a sense of luxury. The display panel is attached to the front frame portion of the housing that houses the electronic device. In the case of a glass-made panel, its back side is often attached to the front frame portion using an adhesive tape or the like.

[0003] The method of attaching and fixing the display panel to the housing with an adhesive tape or the like involves complicated operations such as preparing the adhesive tape required for fixing and adjusting to accurately position the fixing position. Also, when the display panel needs to be replaced due to damage or breakage, it is difficult to replace if it is attached with an adhesive tape or the like. Nell is fixed Therefore, instead of the above-mentioned fixing method by pasting, a mode is being considered in which a coupling part such as a rib made of a resin member is integrally attached to the back side of the glass-made display panel by outsert molding, and the coupling part is coupled to a coupled part provided on the front frame portion of the housing to attach the display panel to the housing (see, for example, Patent Document 1).

[0004]

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] ​

[0006] When creating a joint on the back of a glass display panel using outsert molding, if the joint is thick and substantial, the difference in thermal expansion and contraction between the glass and resin can result in insufficient adhesion of the joint to the back of the display panel, making it prone to peeling.

[0007] Furthermore, for example, in the case of car navigation display panels, it is desirable from an aesthetic standpoint to fix a display panel formed from a curved, thin glass substrate to the housing. However, in a configuration where a bonding portion is provided on the back side of a thin glass substrate that can be curved by outsert molding, thermal shrinkage of the resin used in the bonding portion can easily cause sink marks and warping on the front side of the glass substrate, which can degrade the appearance quality of the display panel.

[0008] In this case, as will be described later, it is presumed that the occurrence of sink marks and waviness can be suppressed by using a resin material with low shrinkage force during molding, such as an elastic, soft polymer material like an elastomer. However, because the bonding parts molded from elastomer are soft, it is difficult to adopt a method of fixing the display panel to the housing by fastening the bonding parts to the bonding parts using set screws. That There is a problem.

[0009] In view of the problems of the prior art, the present invention aims to provide a resin molded body that serves as a joint for fixing to a housing, integrally attached to the back side of a thin glass display panel, without causing any sink marks or warping on the front side of the display panel, and to enable the resin molded body to be stably fixed to the back side of the display panel with sufficient hardness to be fixed using fastening screws. [Means for solving the problem]

[0010] To solve the aforementioned problems, the inventors investigated the conditions under which sink marks and undulations appear on the front side of a glass substrate when a resin molded body is provided on the back side of a glass substrate constituting a display panel. They found that undulations do not occur when the glass substrate is sufficiently thick compared to the thickness of the resin molded body, but when a resin molded body is provided on a thin glass substrate, sink marks and undulations tend to appear on the surface side of the glass substrate even if the thickness of the resin molded body is small.

[0011] It is presumed that when the glass substrate is thin, the shrinkage force of the resin acting on the surface of the glass substrate as it solidifies into the shape of the molded body exceeds the force that holds the glass substrate flat (the static force of the glass). This shrinkage force causes the portion of the glass substrate where the resin molded body is attached to deform into a convex shape locally, and this convex deformation is the cause of the sink marks and waviness that appear on the surface of the glass substrate. Based on this presumption, it is assumed that the occurrence of sink marks and waviness can be suppressed by selecting a material for the resin molded body and using a resin with low shrinkage force during molding, such as an elastomer. Therefore, when molding a resin molded body to a hardness sufficient to fasten it with a set screw, if a resin with low shrinkage force during molding is used in the portion of the resin molded body that comes into contact with the glass substrate, it is considered that the appearance of sink marks and undulations on the glass substrate can be suppressed.

[0012] This invention is based on the above-mentioned findings and assumptions. That is, the composite of the present invention is a glass substrate Only on one side , This is the joint part used to secure it to the casing. A composite of glass and resin components with a resin molded body, The resin molded body It has a main body that connects to the part of the housing to be connected, and this main body is Thermoplastic elastomer layer via a base section consisting of Bonding to the aforementioned glass substrate And so, The area of ​​the base portion overlapping one side of the glass substrate is larger than the area of ​​the main body portion overlapping the base portion. It is characterized by the following:

[0013] Elastomers are soft polymers with rubber-like elasticity, and resin materials containing them are easy to process because they are fluid at high temperatures, and they have the characteristic of possessing strength even without the inclusion of fillers. By providing a thermoplastic elastomer layer at the bonding portion between the resin molded body and the glass substrate, the resin molded body can be stably fixed to the glass surface, and at the same time, the shrinkage force of the resin during molding is small and falls below the static force of the glass, thereby suppressing the occurrence of sink marks and waviness on the glass surface.

[0014] The thermoplastic elastomer layer is made from a resin containing a thermoplastic elastomer, and it is more preferable to use a thermoplastic elastomer. Examples of thermoplastic elastomers include styrene-based elastomers, vinyl chloride-based elastomers, olefin-based elastomers, urethane-based elastomers, polyester-based elastomers, nitrile-based elastomers, and polyamide-based elastomers. From the viewpoint of adhesion to the adhesive layer, styrene-based elastomers, urethane-based elastomers, and polyester-based elastomers are preferred, and among these, polyester-based elastomers are preferred. The thermoplastic elastomer layer is preferably made of a thermoplastic elastomer alone, but may contain one or more known thermoplastic resins. Examples of thermoplastic resins include ABS resins, polypropylene resins, polyamide resins, polycarbonate resins, POM resins, PMMA resins, PBT resins, PC-ABS resins, and the like.

[0015] The resin molded body is constructed by placing the thermoplastic elastomer layer in the portion that will be joined to the glass substrate, and molding the other portions using a resin with high rigidity (tensile strength, bending strength), thereby ensuring sufficient hardness to allow fastening with retaining screws. As a resin with high rigidity (tensile strength, bending strength), it is preferable to use a resin material whose main component is at least one of ABS resin, polycarbonate resin, or polybutylene terephthalate resin.

[0016] The composite of the present invention can be configured by laminating a printing layer and an adhesive layer on a glass substrate and disposing a resin molded body partially on the surface of this adhesive layer. For example, when the composite of the present invention is a display panel of a car navigation system, the glass substrate forms a black printing layer in a strip shape along the four peripheral portions of a rectangular glass plate in a plan view on the back side of the glass plate, laminates an adhesive layer on the surface of this printing layer, and can be configured by forming a resin molded body on the surface of this adhesive layer.

[0017] The ink for forming the printing layer may be any ink that can be directly printed on the glass plate. Commercially available products for glass plate printing can be used. From the viewpoint of adhesion to glass, an ink added with a silane coupling agent is preferable. The ink is used containing a black coloring agent such as carbon black, and the printing layer forms a black colored portion on the surface of the glass plate.

[0018] The adhesive layer may be any layer that can be joined to the printing layer and the resin molded body to be injection molded. Commercially available binder inks and adhesion reinforcing agents used for injection molding can be used.

[0019] The glass substrate with the printing layer and the adhesive layer laminated on one side surface of the glass plate preferably has a thickness of 0.2 mm or more and 2.0 mm or less, and more preferably 0.5 mm or less for applications where the glass is curved and held and fixed in a curved surface shape. If it is 0.5 mm or less, it is preferable because the glass substrate can be processed into a curved surface shape and can be held in a curved surface shape and installed in a housing. If it is 0.2 mm or more, it is preferable because the glass substrate is not easily broken even when curved.

[0020] Examples of the glass substrate include borosilicate glass, aluminosilicate glass, and aluminoborosilicate glass. Further, examples include low-alkali glass and non-alkali glass such as these glasses. Furthermore, examples include silica glass and soda-lime glass. Among these, borosilicate glass, aluminosilicate glass, aluminoborosilicate glass, and their low-alkali glasses are preferred, and their non-alkali glasses are more preferred. The glass substrate may be colorless or colored, but is preferably colorless and transparent in order to improve the visibility of the display.

[0021] The composite of the present invention can be used for a display panel of a device that displays various information and images. Examples of the display device include in-vehicle devices such as car navigation, and other electronic devices equipped with panel displays such as liquid crystal displays and organic EL displays.

[0022] Further, the present invention relates to a method for manufacturing a composite of a glass and a resin member in which a resin molded body is disposed on the surface of a glass substrate. A step of injection molding a first resin molded body, which is a main body portion of the resin molded body, with a primary molding die. Transferring the first resin molded body to a secondary molding region and inserting it into the region. A glass substrate having a partially laminated printed layer and adhesive layer on its surface, such that the laminated portion faces the first resin molded body. A step of inserting. Closing the secondary molding die and injection molding a second resin molded body, which is a base portion of the resin molded body, between the glass substrate and the first resin molded body. The area of ​​the joint with the glass substrate is made larger than the area of ​​the joint with the first resin molded body. A step of injection molding. A step of opening the secondary molding die and taking out the composite of the glass substrate and the resin member, characterized by having these steps.

[0023] By using a resin material mainly composed of at least one of an ABS-based resin, a polycarbonate-based resin, or a polybutylene terephthalate-based resin as the primary molding resin and using a polyester-based thermoplastic elastomer as the secondary molding resin, a composite of the glass and the resin member having the above configuration is manufactured.

[0024] In this case, when molding the first resin molded body, it is preferable to provide at least one hole that penetrates the first resin molded body along its thickness direction, and when molding the second resin molded body, to allow the secondary side molding resin to flow from the hole between the glass substrate and the first resin molded body, thereby solidifying and integrating the first and second resin molded bodies and the glass substrate. In the method for manufacturing the composite, when the secondary molding resin is introduced between the first resin molded body and the glass substrate, it is possible to introduce the secondary molding resin from the ends of both members. However, in this case, burrs of the secondary molding resin tend to form on the edges of the resin molded body, and the formation of burrs is particularly pronounced when the elastomer is the secondary molding resin. As described above, by introducing the secondary molding resin from the holes provided in the first resin molded body, that is, from within the plane of the first resin molded body, burrs of the secondary molding resin are less likely to form, and the secondary molding resin flows into the void between the first resin molded body and the glass substrate at a uniform rate, thereby preventing uneven distribution of shrinkage force acting on the glass substrate during molding.

[0025] Furthermore, in the method for manufacturing the composite, it is preferable that the inner surface of the first resin molded body facing the glass substrate is provided with embossing or textured surfaces, or grooves arranged in multiple rows or a grid pattern, so as to increase the contact area between the first resin molded body and the secondary molded resin that flows between it and the glass substrate. [Effects of the Invention]

[0026] According to the composite of the present invention, even when a resin molded body, such as a joint for fixing to a housing, is integrally provided on the back side of a thin glass display panel, the resin molded body, which has sufficient hardness to be fixed using fastening screws, can be stably fixed to the back side of the display panel without causing sink marks or warping to appear on the front side of the display panel. [Brief explanation of the drawing]

[0027] [Figure 1]This figure shows the front and back surfaces of a display panel, which is one embodiment of the composite of the present invention, divided into sections. [Figure 2] Figure 1 is an enlarged, broken perspective view of the portion of the display panel where the resin molded body is provided. [Figure 3] Figures (A) and (B) are diagrams illustrating the molding process of the display panel in Figure 1, and are schematic cross-section views of the primary side molding die. Figure (B) shows the cross-section view of the position where the hole in the first resin molded body is provided. [Figure 4] (A) and (B) are diagrams illustrating the molding process of the display panel in Figure 1, and are schematic cross-sectional end views of the secondary side molding die. [Figure 5] This is an enlarged section view of the display panel removed from the secondary molding die. [Figure 6] This is an enlarged section view of a gated display panel. [Modes for carrying out the invention]

[0028] The composite of the present invention will be described below based on examples. The embodiments shown below are illustrative examples for embodying the technical concept of the present invention, and the present invention is not limited to the following forms.

[0029] Figure 1 shows an example of how the composite of the present invention is applied to a car navigation display panel. The illustrated display panel 1 is constructed by integrally arranging multiple resin molded bodies 3, which serve as bonding points, on the back side of a horizontally elongated rectangular glass substrate 2. The display panel 1 is integrally attached to the front of the housing (not shown) of the car navigation system, which houses electronic devices, by bonding a resin molded body 3, which is a bonding portion provided on the back side of the glass substrate 2, to a bonding portion provided on the front frame of the housing. This forms the display surface of the car navigation system.

[0030] The glass substrate 2 is formed by providing black colored areas 22 in a band-like manner along the four peripheral edges on the back side of a transparent, horizontally elongated rectangular glass plate 21, and is formed to a thickness of approximately 0.35 mm overall.

[0031] The colored portion 22 is formed by laminating an adhesive layer 22b onto a printed layer 22a provided on the back side of the glass plate 21.

[0032] In more detail, the colored portion 22 is formed by applying an ink made of acrylic urethane resin containing a silane coupling agent and a black coloring agent in a frame shape along the peripheral edge of the back side of the glass plate 21 to form a printed layer 22a. After the printed layer 22a dries, a two-component curing polyurethane ink is applied to its surface and dried to form an adhesive layer 22b on top of the printed layer 22a.

[0033] As shown in Figure 1, the resin molded body 3 is attached integrally to the top edge and left and right side edges of the glass substrate 2, on the surface of the colored portion 22 formed on the back side of the glass substrate 2.

[0034] More specifically, as shown in Figure 2, the resin molded body 3 is connected to the part of the housing to be bonded. Main body 31 having a roughly cylindrical section It is formed by integrally fixing it to the surface of the glass substrate 2 via a base portion 32 positioned at the joint with the glass substrate 2. The main body portion 31 is formed using a resin material with high rigidity (tensile strength, bending strength) mainly composed of polycarbonate resin, and the base portion 32 is formed using a polyester thermoplastic elastomer with low shrinkage force during molding. The resin molded body 3 suppresses the appearance of sink marks and waviness in the glass substrate 2 during molding by placing the base portion 32 made of polyester thermoplastic elastomer at the joint of the glass substrate 2, while the main body portion 31 made of a highly rigid resin material is placed on top of the base portion 32, thereby ensuring that the resin molded body 3 as a whole has sufficient hardness to firmly bond to the part of the housing to be bonded.

[0035] Display panel 1 with this configuration can be manufactured using a two-color molding die consisting of a primary side molding die and a secondary side molding die, as shown in Figures 3 and 4.

[0036] Specifically, the molding of the display panel 1 begins by covering the core 42 with the cavity 41 of the primary molding die 4, as shown in Figure 3(A), closing the primary molding die 4, and injecting the primary molding resin, which mainly consists of a highly rigid polycarbonate resin, into the mold to injection mold the main body 31, which is the first resin molded body. At this time, as shown in Figure 3(B), the main body 31 is provided with a hole 31a that penetrates along its thickness direction.

[0037] Next, the primary molding die 4 is opened, and the main body 31, which is the first resin molded body, is transferred together with the core 42 to the molding area of ​​the secondary molding die 5, and as shown in Figure 4(A), within this molding area, The glass substrate 2, on which the colored portion 22 is provided on the surface, is arranged so that the colored portion 22 faces the main body portion 31. Insert. The core (not shown) of the secondary molding die 5 is formed in the same shape as the core 42, and is transferred to the molding area of ​​the primary molding die 4 at the same time as the transfer of the core 42 and the main body 31.

[0038] Once the glass substrate 2 is inserted into the secondary molding die 5, the cavity 51 of the secondary molding die 5 is placed over the core 42 to close the secondary molding die 5, and as shown in Figure (B), a secondary molding resin made of polyester thermoplastic elastomer is allowed to flow between the glass substrate 2 and the main body 31 through the hole 31a provided in the main body 31 to injection mold the base portion 32, which is a second resin molded body, and solidify and integrate the main body 31 and the glass substrate 2 via this base portion 32. By allowing a secondary molding resin (second resin molded body) with relatively low shrinkage force to flow between the glass substrate 2 and the main body 31 (first resin molded body) after the main body 31, which has high rigidity (relatively large shrinkage force), has solidified or partially solidified, the effects of thermal shrinkage force during the solidification of the main body 31 are not transmitted to the glass substrate 2, thereby preventing sink marks and waviness from occurring in the glass substrate 2.

[0039] Then, the secondary molding die 5 is opened, and the glass substrate 2, with the main body 31 fixed to the back side via the base portion 32, is removed from the mold. As shown in Figure 5, the gate 32a of the base portion 32 that protrudes from the hole 31a of the main body 31 of the resin molded body 3 of the removed glass substrate 2 is cut off, thereby producing a display panel 1 in which the resin molded body 3 is integrally fixed to the back side of the glass substrate 2, as shown in Figure 6. As shown in both figures, the area of ​​the base portion 32 that overlaps one side surface of the glass substrate 2 is larger than the area of ​​the main body portion 31 that overlaps the base portion 32.

[0040] In the illustrated embodiment, the composite of the present invention is applied to the display panel of a car navigation system, but it can also be applied to the display panels of other information display devices. In this case, the display panel is formed to a size appropriate to the display device, and the resin molded bodies provided on the back side of the glass substrate are installed in an appropriate number and at appropriate positions on the back surface of the glass substrate, according to the size of the display device. Furthermore, although the resin molded body that forms the connection part of the display panel is formed in a substantially cylindrical shape, the resin molded body can be formed in an appropriate shape depending on the connection method with the connection part provided on the housing of the display device, such as a convex boss, a concave shape, a protruding shape with a thick tip, or a screw hole shape into which a retaining screw is screwed. The shapes and combinations of the glass substrate and resin molded body constituting the composite of the present invention are merely examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention. [Explanation of Symbols]

[0041] 1 Composite (display panel), 2 Glass substrate, 21 Glass plate, 22 Colored part, 22a Printed layer, 22b Adhesive layer, 3 Resin molded body, 31 Main body, 31a Hole, 32 Base part, 4 Primary side molding die, 41 Cavity, 42 Core, 5 Secondary side molding die, 51 Cavity

Claims

1. A composite of glass and resin components, wherein a resin molded body, which serves as a bonding portion for fixing to the housing, is placed only on one side of the glass substrate, The resin molded body has a main body that is bonded to the part of the housing to be bonded, and this main body is bonded to the glass substrate via a base portion made of a thermoplastic elastomer layer. The area of ​​the base portion overlapping one side of the glass substrate is larger than the area of ​​the main body portion overlapping the base portion. The composite is characterized in that the glass substrate has a partially laminated printed layer and adhesive layer on its surface, and the resin molded body is disposed on the surface of the adhesive layer.

2. The composite according to claim 1, wherein the thermoplastic elastomer layer is a polyester-based thermoplastic elastomer.

3. The composite according to claim 1 or 2, wherein the resin molded article is mainly composed of at least one of ABS resin, polycarbonate resin, or polybutylene terephthalate resin.

4. A display device using the composite according to any one of claims 1 to 3 as a display panel.

5. In a method for producing the composite described in claim 1, A step of injection molding the first resin molded body, which is the main body of the resin molded body, using a primary side molding die, The process involves transferring the first resin molded body to the secondary molding region and inserting a glass substrate into the region such that the colored portion, which has a partially laminated printed layer and adhesive layer on its surface, faces the first resin molded body. A step of closing the secondary molding die and injection molding a second resin molded body, which is the base portion of the resin molded body, between the glass substrate and the first resin molded body such that the area of ​​the joint portion with the colored portion of the glass substrate is larger than the area of ​​the joint portion with the first resin molded body, The process involves opening the secondary molding die and removing the composite of the glass substrate and the resin member, A method for producing a composite, characterized by having the above characteristics.

6. The method for producing a composite according to claim 5, wherein the primary molding resin is a resin material mainly composed of at least one of ABS resin, polycarbonate resin, or polybutylene terephthalate resin, and the secondary molding resin is a polyester thermoplastic elastomer.

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