JP2012068549A - Electronic member with protection plate and method for manufacturing electronic member with protection plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic member with a protection plate which can avoid increase in number of components, reduce manufacturing man-hours and accelerate cost reduction, and a method for manufacturing the same.SOLUTION: An electronic member with a protection plate comprises a transparent protection plate 2 mounted in front of an electronic member 1 including a transparent substrate. A light shielding frame 4 in a frame shape is formed in a peripheral edge part of an inner surface opposite to the electronic member 1 of the transparent protection plate 2. A spacer part 42 for controlling the size of an interval c between the electronic member 1 and the transparent protection plate 2 is provided in a manner to project along the inner peripheral edge of the light shielding frame 4 integrally with the light shielding frame 4. The electronic member 1 and the transparent protection plate 2 are bonded together with a transparent resin adhesive 3' filled in a region surrounded with the spacer part 42. Thus, increase in number of components is avoided and manufacturing man-hours are reduced.

Description

  The present invention relates to an electronic member provided with a protective plate and a manufacturing method thereof.

  In recent years, FPD (Flat Panel Display), which is advantageous for thinning of liquid crystal display panels, organic EL panels, and the like, is often used as a display monitor for mobile electronic devices such as mobile phones and personal digital assistants (PDAs). ing. Further, a touch panel may be provided on the front surface of the FPD as an input device.

  On the other hand, since a mobile device has a high possibility that a user will inadvertently drop it or hit a wall or the like, a protection plate for preventing damage is installed on the front surface of an electronic member such as an FPD or a touch panel. In addition, a frame-shaped light shielding frame is formed on the inner peripheral edge of the protective plate facing the electronic member side to suppress the incidence of light on the area overlapping the light shielding frame of the electronic member arranged on the rear side of the protective plate. ing.

  And when arrange | positioning the above-mentioned protective plate in the front surface of an electronic member, a frame-shaped spacer frame is interposed between an electronic member and a protective plate, and the appropriate amount of a transparent adhesive is dripped in a spacer frame. A method is adopted in which the panels are pressed and spread between the panels, filled with an even thickness without causing the transparent adhesive to stick out, and the panels are firmly bonded. (Patent Document 1)

JP 2005-55641 A

  However, in the above-described electronic member with a protective plate, first, screen printing or the like is used on the periphery of the protective plate, a black resin ink is applied to form a light shielding frame, and then a spacer frame is formed between the electronic member and the protective plate. Adhere both panels. Therefore, it is necessary to separately prepare a dedicated spacer frame when bonding the protective plate and the electronic member, and to install the spacer frame along the periphery of the electronic member. Manufacture work man-hours when adhering are increased.

  An object of the present invention is to provide an electronic member with a protective plate that can avoid an increase in the number of parts, reduce the number of manufacturing work steps, and promote cost reduction, and a manufacturing method thereof.

  The electronic member with a protective plate according to the first aspect of the present invention is an electronic member with a protective plate in which a transparent protective plate is mounted on the front surface of an electronic member including a transparent substrate, and the electronic of the protective plate A frame-shaped light shielding frame is formed on the peripheral edge of the inner surface facing the member side, and a spacer portion that regulates the size of the gap between the electronic member and the protective plate is along the inner peripheral edge of the light shielding frame. The electronic member and the protective plate are joined by a transparent resin adhesive that is integrally projected on the light shielding frame and filled in a region surrounded by the spacer portion. is there.

  According to a second aspect of the present invention, in the electronic member with a protective plate according to the first aspect, the light shielding frame is formed by screen printing using a black resin ink agent.

  According to a third aspect of the present invention, in the electronic member with a protective plate according to the first or second aspect, the electronic member includes a liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of rectangular transparent substrates, and the electronic member The liquid crystal display device includes a light source unit that emits light toward the liquid crystal display panel.

  According to a fourth aspect of the present invention, in the electronic member with a protective plate according to the third aspect, the effective region surrounded by the light shielding frame of the protective plate overlaps the entire effective display region of the liquid crystal display panel. It is characterized by.

  The invention according to claim 5 is the electronic member with a protective plate according to claim 1 or 2, wherein the electronic member is a touch panel.

  According to a sixth aspect of the present invention, in the electronic member with a protective plate according to the fifth aspect, an effective region surrounded by the light shielding frame of the protective plate overlaps an entire effective operation region of the touch panel. It is what.

  According to a seventh aspect of the present invention, in the electronic member with a protective plate according to any one of the first to sixth aspects, a plurality of missing portions where the spacer portion is not disposed are provided on the inner peripheral edge of the light shielding frame. It is characterized by being.

  The method for producing an electronic member with a protective plate according to the present invention described in claim 8 is a method for producing an electronic member with a protective plate in which a protective plate for protecting the electronic member is disposed on the front side of the electronic member including a transparent substrate. A step of printing a resin ink on a peripheral portion of a printing surface of the protection plate by a screen printing method to form a frame-shaped light shielding frame; and a step of printing the resin ink on an inner peripheral portion of the light shielding frame by a screen printing method. Printing, and forming a spacer part that regulates the size of the gap between the electronic member and the protective plate, filling the region surrounded by the spacer part with a transparent resin adhesive, and the protective plate And a step of joining the electronic member.

  ADVANTAGE OF THE INVENTION According to this invention, the increase in the number of parts is avoided, a manufacturing operation man-hour is shortened, and the electronic member with a protective plate which can accelerate | stimulate cost reduction, and its manufacturing method can be provided.

It is typical sectional drawing which shows the liquid crystal display device as one Embodiment of this invention. It is a disassembled perspective view which shows the principal part structure and manufacturing process of the said liquid crystal display device. It is typical sectional drawing which shows other embodiment of this invention.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. In this embodiment, a case where a liquid crystal display device is used as an electronic member will be described. FIG. 1 is a schematic cross-sectional view of a liquid crystal display device 1 according to the present embodiment. The liquid crystal display panel 10 in the liquid crystal display device 1 is, for example, a TN type liquid crystal display panel, and a twisted nematic liquid crystal layer (not shown) is sandwiched between a pair of rectangular transparent substrates 11 and 12, and a pair of transparent substrates. A front polarizing plate 13 and a rear polarizing plate 14 are attached to the outer surfaces of 11 and 12, respectively.

  The rear transparent substrate 12 disposed on the rear side of the pair of transparent substrates 11 and 12 is formed with a projecting edge portion 121 having one edge portion extended from the corresponding edge surface of the front transparent substrate 11 by an appropriate length. A driver chip 15 for driving and displaying liquid crystal is directly mounted on the projecting edge 121 by a COG (Chip On Glass) method. A flexible wiring board 16 for wiring-connecting the drive control circuit board (not shown) and the liquid crystal display panel 10 is conductively joined to the tip of the protruding edge 121.

  A light source unit 60 that is a surface light source is disposed on the rear side of the liquid crystal display panel 10. The light source unit 60 includes a light guide plate 62 having a thickness between a light emission surface and an opposite surface thereof and having an end surface as a light incident surface, and a light source 61 that emits light toward the light incident surface of the light guide plate 62. And a light diffusion sheet and a pair of prism sheets arranged so as to overlap the light exit surface (both not shown). Light is emitted from the light exit surface of the light source unit 60 toward the liquid crystal display panel 10. The liquid crystal display device 1 is constituted by the liquid crystal display panel 10 and the light guide plate 60.

  On the front surface of the liquid crystal display panel 10, a transparent protective plate 2 is superposed via a transparent adhesive layer 3. The transparent protective plate 2 is made of a transparent plate material such as a glass plate or an acrylic resin plate, and has a size in which each peripheral portion of each of the four sides is projected by an appropriate length with respect to the rectangular shape of the liquid crystal display panel 10. It is formed in a rectangular plate.

  A frame-shaped light shielding frame 4 is installed on the inner surface of the transparent protective plate 2 facing the front surface of the liquid crystal display panel 10. The light shielding frame 4 installed on the transparent protective plate 2 suppresses the incidence of light to the area overlapping the light shielding frame 4 of the electronic member disposed on the rear side of the protective plate. The light shielding frame 4 of this embodiment is attached to an area corresponding to a non-display area that is an area other than the effective display area Dd where the display of the liquid crystal display panel 10 is performed, and the light shielding frame 4 forms a rectangular effective area. 41 is defined. That is, the effective area 41 overlaps the entire effective display area Dd. The area of the effective area 41 defined by the light shielding frame 4 is set to be slightly wider than the effective display area Dd. The effective display area Dd secures a margin of an appropriate length over the entire circumference and is within the effective area 41. The arrangement is included.

  Thus, the light shielding frame 4 is integrally provided with a spacer portion 42 that regulates the joint gap dimension c between the transparent protective plate 2 and the liquid crystal display panel 10. As shown in FIG. 2, the spacer portion 42 is disposed along each of the four end surfaces forming the rectangular effective area 41. That is, the spacer portion 42 is provided so as to protrude along the inner peripheral edge of the light shielding frame 4 surrounding the effective area 41. In addition, each spacer portion 42 is formed in an elongated rectangular parallelepiped extending along each corresponding end surface, and a missing portion where no spacer portion exists between the adjacent spacer portions 42 and 42, that is, at four corner portions. 43 are formed. The missing portion 43 is an inner peripheral edge portion of the light shielding frame 4 surrounding the effective area 41 and is a portion where no spacer is disposed.

  The light shielding frame 4 of the present embodiment including the above-described spacer portion 42 is integrally applied and formed by a screen printing method using black resin ink. As the black resin ink, an ink for screen printing in which carbon black is mixed in an acrylic binder resin is preferably used.

  At the time of printing, a printing plate in which the roughness of the portion corresponding to the spacer portion 42 is appropriately roughened than other portions is used, or first, the entire surface of the light shielding frame 4 is the liquid crystal display device 1 of the transparent protective plate 2. The inner peripheral edge of the light shielding frame is changed to a plate on which only the spacer portion 42 is printed after printing with a plate that is printed with a uniform thickness on the peripheral portion of the surface (printing surface) that faces the substrate and forming a frame-shaped light shielding frame. By overprinting the part, the light shielding frame 4 in which the spacer part 42 is integrally formed can be easily formed.

  The light shielding frame 4 is not limited to the one formed by printing the resin ink, but may be formed by pressing a metal plate of another material such as aluminum. Also in this case, the spacer portions can be easily and integrally formed.

  Transparent resin adhesive 3 ′ is formed in the joint region surrounded by the four spacer portions 42 in the gap c whose size is regulated by the spacer portion 42 between the transparent protective plate 2 and the liquid crystal display panel 10. It is completely filled. This transparent resin adhesive 3 ′ is a composite transparent resin adhesive made of a transparent resin having both ultraviolet-polymerizable and thermal-polymerizable characteristics.

  Examples of the composite transparent resin adhesive 3 'include acryl cyclic monomers such as acrylic monomers such as acrylate and methacrylate, or acrylic oligomers which are low polymers of one or both of acrylate and methacrylate, and organic compounds such as sulfonium salts. What added the hardening initiator which consists of peroxides etc. is used suitably.

  Among them, the viscosity in an unpolymerized state is 1500 to 10000 mPa · s (millipascal second), preferably 3000 to 5000 mPa · s, and the E-code hardness after ultraviolet polymerization and thermal polymerization is E4 to E13, preferably In order to improve the joining workability, it is desirable that the shrinkage ratio of E7 to E10, ultraviolet polymerization and thermal polymerization is 0.9 to 2.0%, preferably 0.97 to 1.64%.

  When the transparent protective plate 2 is installed in the liquid crystal display device 1, first, as shown in FIG. 2, first, before the transparent resin adhesive 3 ′ in an unpolymerized state is placed in contact with the front surface of the liquid crystal display panel 10. It is dropped on the center of the polarizing plate 13 by a dispenser or the like. The dropping amount of the transparent resin adhesive 3 ′ at this time is such that the volume of the joining area, that is, the gap c between the liquid crystal display panel 10 and the transparent protective plate 2 defined by the light shielding frame spacer portion 42 and the four spacer portions 42. Is set so that the protruding amount of the transparent resin adhesive 3 ′ from the missing portion 43 to the outside is as small as possible.

  Next, the transparent protective plate 2 on which the light-shielding frame 4 is printed is placed with the light-shielding frame 4 facing the front surface of the liquid crystal display panel 10 while aligning, and then the entire outer surface of the transparent protective plate 2 is evenly placed. The transparent resin adhesive 3 ′ sandwiched between the liquid crystal display panel 10 is pushed and spread. In this pressurization process, it is only necessary to press the transparent protective plate 2 until the front end surface of the spacer portion 42 of the light shielding frame 4 contacts the front surface of the front transparent substrate 11 of the liquid crystal display panel 10. Thereby, after transparent resin adhesive 3 'is spread over the whole joining area | region enclosed by the spacer part 42, the excess part is extruded out of a joining area | region from the four missing parts 43 equally. At this time, since the four missing portions 43 are provided in the rectangular corner portion, the pressurized transparent resin adhesive 3 ′ is spread evenly in all directions, and the air in the joining region has four locations. The transparent resin adhesive 3 ′ is quickly discharged from the missing portion 43 and filled in the entire joining region without any gap without entraining air.

  Next, ultraviolet light is irradiated to the transparent resin adhesive 3 ′ for a certain period of time from the outer surface side of the transparent protective plate 2 while maintaining the above-described pressure state. In this ultraviolet irradiation process, the ultraviolet irradiation is performed for a time slightly longer than the calculated time required for the transparent resin adhesive 3 ′ to be polymerized according to the characteristics of the transparent resin adhesive 3 ′. . When the ultraviolet irradiation over the predetermined time is completed, the pressurized state is released.

  In the ultraviolet irradiation process described above, the ultraviolet light irradiated on the light shielding frame 4 attached to the inner surface of the transparent protective plate 2 is blocked from transmitting. Therefore, many portions of poor polymerization and unpolymerized portions due to insufficient irradiation of ultraviolet rays remain in the transparent resin adhesive 3 ′ that has entered the missing portion 42, which is a shadow area of the light shielding frame 4 other than the bonding region.

  Therefore, after the above-described ultraviolet irradiation process, the assembly in which the workpiece, that is, the transparent protective plate 2 is temporarily bonded to the front surface of the liquid crystal display panel 10 via the transparent resin adhesive 3 'is replaced with the transparent resin adhesive 3'. And left in a heating atmosphere such as a chamber maintained at a thermal polymerization temperature of a certain time. Thereby, the poor polymerization part and the unpolymerized part due to insufficient ultraviolet irradiation of the transparent resin adhesive 3 ′ are thermally polymerized. As a result, substantially the entire amount of the transparent resin adhesive 3 ′ supplied dropwise is sufficiently polymerized and cured through irradiation with ultraviolet rays and a heating process, and the transparent protective plate 2 and the liquid crystal display panel 10 are firmly bonded.

  As described above, the electronic member with a protective plate of the present embodiment is a region other than the effective display region Dd in which the display of the liquid crystal display panel 10 is performed on the transparent protective plate 2 joined to the front surface of the liquid crystal display panel 10. The light shielding frame 4 is formed in a region corresponding to the non-display region, and the spacer portion 42 that regulates the size of the bonding gap c is integrally projected along the inner peripheral edge of the light shielding frame 4 surrounding the effective display region Dd. Therefore, the spacer as a dedicated part for regulating the joining gap c is omitted, the number of parts is reduced, and the labor for positioning the spacer in the joining operation of the transparent protective plate 2 is saved, thereby reducing the manufacturing man-hours. It can be shortened.

  In addition, the spacer portion 42 is projected along each of the four end surfaces forming the rectangular effective region 41 surrounding the effective display region Dd, and between the spacer portions 42 along the adjacent end surfaces, that is, at the rectangular corner portion. Since the missing portions 43 are respectively formed, when the transparent resin adhesive 3 ′ is pressed and spread in the joining region surrounded by the four spacer portions 42 during the joining operation, air is removed from the missing portions 42 at the four corner portions. Can be quickly discharged, and the transparent resin adhesive 3 ′ can be filled in the joining region without any gaps without involving bubbles. As a result, the possibility that an air layer is generated in the transparent adhesive layer 3 and light is reflected at the interface to deteriorate the display quality is eliminated.

  In addition, this invention is not limited to said embodiment. For example, in the above embodiment, the transparent protective plate 2 is bonded to the liquid crystal display device 1 via the transparent adhesive layer 3, but the present invention is not limited to this, and as shown in FIG. The present invention is also effectively applied when the transparent protective plate 2 is disposed on the front surface of a certain touch panel 5. At that time, the display area 41 overlaps the entire effective operation area Dp, which is an area where an input operation on the touch panel 5 is effective. Further, the touch panel 5 of the present embodiment is disposed on the front surface of the liquid crystal display device 1.

  In the present embodiment, the area of the effective area 41 defined by the light shielding frame 4 is set to be slightly wider than the effective display area Dd. However, the effective display area Dd and the effective area 41 are equal in size. Also good.

  In the present embodiment, the case where the display device used as the electronic member is a liquid crystal display device has been described as an example. However, the display device as the electronic member is not limited to the liquid crystal display device, and an organic EL display panel or the like is used. Of course, the present invention is effectively applied to other display devices.

1 Liquid crystal display device (electronic component)
2 Transparent protective plate 3 Transparent adhesive layer 3 'Transparent resin adhesive 4 Light-shielding frame 10 Liquid crystal display panel 41 Effective area 42 Spacer part 43 Missing part 5 Touch panel (electronic member)
60 Light source unit 61 Light source 62 Light guide plate Dd Effective display area Dp Effective operation area

Claims (8)

An electronic member with a protective plate formed by mounting a transparent protective plate on the front surface of an electronic member including a transparent substrate,
A frame-shaped shading frame is formed on the peripheral edge of the inner surface of the protective plate facing the electronic member side,
A spacer portion that regulates the size of the gap between the electronic member and the protective plate is integrally projected on the light shielding frame along the inner peripheral edge of the light shielding frame,
An electronic member with a protective plate, wherein the electronic member and the protective plate are joined by a transparent resin adhesive filled in a region surrounded by the spacer portion.   2. The electronic member with a protective plate according to claim 1, wherein the light shielding frame is formed by applying a black resin ink agent by screen printing.   The electronic member is a liquid crystal display device having a liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of rectangular transparent substrates and a light source unit that emits light toward the liquid crystal display panel. The electronic member with a protective plate according to claim 1 or 2.   4. The electronic member with a protective plate according to claim 3, wherein an effective area surrounded by the light shielding frame of the protective plate overlaps an entire effective display area of the liquid crystal display panel.   The electronic member with a protective plate according to claim 1, wherein the electronic member is a touch panel.   6. The electronic member with a protective plate according to claim 5, wherein an effective area surrounded by the light shielding frame of the protective plate overlaps an entire effective operation area of the touch panel.   The electronic member with a protective plate according to any one of claims 1 to 6, wherein a plurality of missing portions where the spacer portion is not disposed are provided on an inner peripheral edge of the light shielding frame. A method for producing an electronic member with a protective plate in which a protective plate for protecting the electronic member is disposed on the front side of the electronic member including a transparent substrate,
Printing resin ink by a screen printing method on the peripheral edge of the printing surface of the protective plate, and forming a frame-shaped light shielding frame;
Printing the resin ink on the inner peripheral edge of the light shielding frame by a screen printing method, and forming a spacer portion that regulates the size of the gap between the electronic member and the protective plate;
Filling a region surrounded by the spacer portion with a transparent resin adhesive, and joining the protection plate and the electronic member.

Images