JP2007292901A - Display module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display module having high reliability by suppressing the peeling of a folded flexible substrate. <P>SOLUTION: The liquid crystal display module 100 is provided with: a liquid crystal panel 101; a FPC (Flexible Printed Circuit) 103 connected with the liquid crystal panel 101; and a backlight unit 102 which is disposed on the back side of the liquid crystal panel 101 and has a frame 113. The liquid crystal display module 100 is further provided with: an adhesion pad which is disposed on the FPC 103 and is located near the edge part of the frame 113 of the backlight unit 102 by folding the FPC 103 to the side where the backlight unit 102 of the liquid crystal display panel 101 is disposed; and solder 105 which bonds the adhesion pad to the frame 113. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display module, and more particularly to a display module including a flexible substrate.

  In general, a flat panel display such as a liquid crystal display device or an organic EL display device uses a flexible printed circuit (FPC) for the purpose of miniaturization (see, for example, Patent Document 1). FIG. 4 shows a configuration of a conventional liquid crystal display device. As shown in FIG. 4, the liquid crystal display device 10 includes a liquid crystal display panel 11, a backlight unit 12, an FPC 13, and the like. The FPC 13 is physically and electrically connected to one side of the liquid crystal display panel 11 by an anisotropic conductive film (ACF).

Further, the FPC 13 is bent into a U shape, and is fixed to the opposite side of the backlight unit 12 by a double-sided adhesive tape 14. A light source 15 is arranged on the FPC 13. The light source 15 is arranged along the light incident end face of the light guide plate provided in the backlight unit 12 by bending the FPC 13.
JP 2002-258317 A

  In recent years, liquid crystal display devices are required to have high reliability, and it is necessary to maintain sufficient quality even in a high temperature and high humidity environment. However, there is a disadvantage when the FPC 13 is bent into a U shape and bonded to the backlight unit 12 as described above. That is, the adhesive ability of the double-sided pressure-sensitive adhesive tape 14 fixing the FPC 13 is lowered, and there is a problem that the FPC 13 is peeled and bent by the elastic restoring force of the conductive thin film and the insulating thin film constituting the FPC 13. As described above, when the FPC 13 is peeled off and bent, there is a problem that the wiring in the FPC 13 is disconnected due to contact with other members constituting the display device, and display failure occurs.

  Further, as described above, when the light source 15 is mounted on the FPC 13 side, there is a problem that the light source 15 is displaced from the light incident end face of the light guide plate due to the FPC 13 being peeled off, and the luminance is lowered. Further, if the optical axis of the light source 15 is deviated, light emission unevenness may occur.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a highly reliable display module that suppresses peeling of the bent flexible substrate.

  A display module according to a first aspect of the present invention is a display module comprising a display panel, a flexible substrate connected to the display panel, and a back member disposed on the back side of the display panel, An adhesive pad that is provided on the flexible substrate and is bent near the end of the back member by bending the flexible substrate toward the back member of the display panel; and solder that bonds the adhesive pad and the back member Is provided. Thereby, it can suppress that a flexible substrate peels from a back surface member.

  In the display module according to the second aspect of the present invention, in the display module described above, the adhesive pad and the back member are bonded to a surface of the back member opposite to the display panel facing surface. is there. Thereby, it can further suppress that a flexible substrate peels from a back surface member.

  In the display module according to a third aspect of the present invention, in the above display module, the end portion of the back member has a metal material exposed at a bonding portion between the bonding pad and the back member. . Thereby, a back surface member and a flexible substrate can be firmly adhere | attached with solder.

  In the display module according to a fourth aspect of the present invention, in the above display module, an adhesive clip made of a metal material is provided at the end of the back member, and the adhesive pad and the back member are the adhesive clip. It is what is pasted through. Thereby, even when it is difficult to bond the back member with solder, the back member and the flexible substrate can be firmly fixed with solder via the adhesive clip.

  In the display module according to a fifth aspect of the present invention, in the display module described above, the width in the direction along the side surface of the end portion of the adhesive pad is larger than the width in the direction along the side surface of the end portion of the adhesive clip. Is also small. Thereby, the influence on the back member by solder can be reduced.

  The display module according to a sixth aspect of the present invention is the above-described display module, wherein the display module is provided on a surface opposite to the display panel facing surface of the back member, and bonds the flexible substrate and the back member. It is what has. Thereby, peeling of a flexible substrate can further be suppressed.

  In the display module according to a seventh aspect of the present invention, in the above display module, the back member is a backlight unit. The present invention is particularly effective in such a case.

  A display module according to an eighth aspect of the present invention is the display module as described above, further comprising a light source provided on the flexible substrate, wherein the light source is accommodated in the backlight unit by bending the flexible substrate. It is. The present invention is particularly effective in such a case.

  According to the present invention, it is possible to suppress peeling of the bent flexible substrate and provide a highly reliable display module.

  A display module according to an embodiment of the present invention will be described with reference to FIGS. Here, the liquid crystal display module 100 will be described as an example of the display module. FIG. 1 is a cross-sectional view showing an example of the configuration of the liquid crystal display module 100 according to the present embodiment. FIG. 2 is a plan view showing an example of the configuration of the liquid crystal display module 100 according to the present embodiment.

  As shown in FIG. 1, a liquid crystal display module 100 according to this embodiment includes a liquid crystal display panel 101, a backlight unit 102, a flexible printed circuit (FPC) 103, an adhesive clip 104, solder 105, a light source 106, A double-sided adhesive tape 107 is provided. Further, the backlight unit 102 includes a frame 113. The liquid crystal display module 100 according to the present invention suppresses the FPC 103 bent to the non-viewing side (back side) of the liquid crystal display panel 101 from being peeled off from the frame 113.

  The liquid crystal display panel 101 displays an image. As shown in FIG. 1, the liquid crystal display panel 101 has a configuration in which liquid crystal is sandwiched between an element substrate 108 and a counter substrate 109 disposed to face the element substrate 108. The viewing side polarizing plate 110 is attached to the viewing side of the element substrate 108, and the anti-viewing side polarizing plate 111 is attached to the counter-viewing side of the counter substrate 109.

  Various types of liquid crystal display panel 101 can be used. For example, an active type liquid crystal display panel having a switch element in each pixel, a passive type liquid crystal display panel having no switch element, or a liquid crystal display panel of a transmissive type, a reflective type or a transflective type. It can also be used. It is also possible to use a liquid crystal display panel in any mode such as a TN (Twisted Nematic) mode, an STN (Super Twisted Nematic) mode, or an IPS (In Plane Switching) mode. In addition to the liquid crystal display panel, other types of display panels such as an organic EL (Electro Luminescence) display panel and an inorganic EL display panel can be used.

  The backlight unit 102 constitutes a planar light source device that irradiates the liquid crystal display panel 101 with planar light. By storing a light source 106 to be described later in the backlight unit 102, a planar light source device that irradiates the liquid crystal display panel 101 with planar light is completed. The backlight unit 102 is provided on the non-viewing side of the liquid crystal display panel 101, that is, the back side. Therefore, the backlight unit 102 becomes a back member disposed on the back side of the liquid crystal display panel 101. As shown in FIG. 2, the backlight unit 102 includes a light guide plate 112, an optical member such as a reflection sheet and a prism sheet (not shown), a frame 113 for housing the optical member, and the like. Further, the frame 113 is formed with a light source storage portion 114 that stores the light source 106. That is, in the light source storage unit 114, a hole for storing the light source 106 is provided on the back side of the frame 113. The light source storage part 114 is located in the vicinity of the light incident surface of the light guide plate 112. The frame 113 constituting the backlight unit 102 is formed of a resin material having high heat resistance such as polycarbonate resin.

  The FPC 103 is electrically and physically connected to a terminal portion provided on one side of the liquid crystal display panel 101 by an ACF (Anisotropic Conductive Film) (not shown). The FPC 103 includes a control circuit board connection part (not shown) connected to a board (control circuit board) on which a control circuit is mounted at one end opposite to the connection part with the liquid crystal display panel 101. The FPC 103 has a configuration in which a plurality of wirings made of a metal material such as Cu are formed on a flexible insulating substrate having high heat resistance such as polyimide resin. Is transmitted toward the liquid crystal display panel 101. Further, as shown in FIG. 1, the FPC 103 is bent on the non-viewing side of the liquid crystal display panel 101. That is, the FPC 103 is bent to the side where the backlight unit 102 is disposed on the liquid crystal display panel 101. A portion where the FPC 103 is bent is defined as a bent portion.

  In addition, an adhesive pad 115 is formed on the FPC 103. The bonding pad 115 is provided for bonding the FPC 103 and the frame 113 with the solder 105. The bonding pad 115 is formed of the same metal material such as Cu as the wiring material of the FPC 103. Further, a cover lay opening is provided at the position where the adhesive pad 115 is formed on the FPC 103, and the metal material is exposed. The adhesive pad 115 is positioned near the end of the frame 113 by bending the FPC 103 to the side where the frame 113 of the liquid crystal display panel 101 is disposed.

  The FPC 103 is provided with a light source 106 such as an LED. The light source 106 is housed in a light source housing portion 114 provided on the frame 113 of the backlight unit 102 by bending the FPC 103. The light source 106 is disposed along the light incident surface of the light guide plate 112. Thus, by storing the light source 106 in the light source storage unit 114, a planar light source device that irradiates the liquid crystal display panel 101 with planar light is obtained.

  An adhesive clip 104 is provided at the end of the frame 113 on the side where the FPC 103 is bent. The adhesive clip 104 is provided to adhere the FPC 103 and the frame 113. As described above, the adhesive pad 115 is positioned near the end of the frame 113 by bending the FPC 103 to the side on which the frame 113 of the liquid crystal display panel 101 is disposed. As a result, the exposed portion of the adhesive pad 115 and the adhesive clip 104 are arranged to face each other. As the solder 105 for bonding the adhesive pad 115 and the adhesive clip 104 disposed at the end of the frame 113, lead-free solder such as Sn—Ag—Cu, Sn—Cu—Ni, Sn—Zn, or the like can be used.

  Conventionally, the FPC bent on the back side of the liquid crystal display panel is fixed to the frame of the backlight unit with a double-sided adhesive tape or the like. However, in a high temperature and high humidity environment, the adhesive ability of the double-sided pressure-sensitive adhesive tape is lowered, and there is a problem that the FPC peels off and bends due to the elastic restoring force of the conductive thin film and the insulating thin film that constitute the FPC.

  In addition, when a light source is conventionally mounted on the FPC side, there is a problem that the luminance is lowered due to the light source being displaced from the light incident end face of the light guide plate due to peeling of the FPC. Further, if the optical axis of the light source is deviated, there is a possibility that uneven light emission may occur.

  However, according to the present invention, the FPC 103 and the frame 113 can be firmly bonded with the solder 105, and the FPC 103 can be prevented from being peeled off from the frame 113. Further, even in a high temperature and high humidity environment, the adhesive ability does not decrease, and the problem that the FPC 103 peels and bends can be solved. For this reason, problems such as display defects that have occurred due to peeling of the FPC 103 can be solved.

  Further, since the FPC 103 is not peeled off, the light source 106 is not displaced from the light incident end face of the light guide plate 112, and the problem that the luminance is reduced can be solved. Furthermore, the occurrence of uneven light emission due to the deviation of the optical axis of the light source can also be suppressed.

  Further, the adhesive clip 104 is disposed so as to sandwich the end portion of the frame 113 on the FPC 103 bent portion side. That is, the adhesive clip 104 has a U-shaped cross section and is attached to the end of the frame 113. The adhesive clip 104 preferably has a spring property. That is, the adhesive clip 104 presses and sandwiches the front and back surfaces of the frame 113. As a result, the adhesive clip 104 can be prevented from being detached from the frame 113.

  Further, the adhesive clip 104 is made of a metal material suitable for solder connection. For example, an adhesive clip 104 formed of Cu, Fe, Ni or the like can be used. As a result, the FPC 103 and the frame 113 can be firmly connected, and peeling and bending of the FPC 103 can be further suppressed.

  The width in the direction along the side surface of the end portion of the frame 113 of the adhesive pad 115 is preferably smaller than the width in the direction along the side surface of the end portion of the frame 113 of the adhesive clip 104. Thereby, adverse effects such as deformation of the frame 113 can be suppressed by heat generated when the adhesive pad 115 and the adhesive clip 104 are soldered.

  Further, the FPC 103 is bonded to the surface of the frame 113 on the non-viewing side with a double-sided adhesive tape 107 or the like. Thus, as compared with the case where the FPC 103 and the frame 113 are bonded only by the solder 105, peeling of the FPC 103 can be further suppressed. For this reason, the liquid crystal display module 100 with higher reliability can be provided.

  Note that when the frame 113 is formed of a metal material such as Cu, Fe, or Ni suitable for solder connection, the adhesive clip 104 may not be provided. That is, when the metal material is exposed at the portion where the frame 113 is bonded to the bonding pad 115, the frame 113 and the bonding pad 115 can be directly bonded by solder. In addition, although the frame 113 is formed of a metal material, the adhesive clip 104 may be provided in the case where the frame 113 is formed of a metal material that is not suitable for solder connection such as SUS steel.

  Here, with reference to FIG. 3, the manufacturing method of the liquid crystal display module 100 which concerns on embodiment of this invention is demonstrated. FIG. 3 is a manufacturing process diagram for explaining a method of manufacturing the liquid crystal display module 100 according to the embodiment of the present invention. As shown in FIG. 3A, first, a liquid crystal display panel 101 to which an FPC 103 is connected and a backlight unit 102 having a frame 113 in which an adhesive clip 104 is fitted are prepared.

  Then, the light source 106 is housed in the light source housing portion 114, and the FPC 103 and the frame 113 are primarily fixed by the double-sided adhesive tape 107. After that, as shown in FIG. 3B, the bonding pad 115 and the bonding clip 104 formed on the FPC 103 are aligned, and the bonding pad 115 and the bonding clip 104 are bonded by the solder 105. Thereafter, as shown in FIG. 3C, the FPC 103 is folded and the liquid crystal display panel 101 is folded back to the viewing side of the backlight unit 102. Thereby, the liquid crystal display module 100 is completed.

  In FIG. 1, the FPC 103 is connected to the non-viewing side of the element substrate 108, but the FPC 103 can also be connected to the viewing side of the element substrate 108 or the counter substrate 109. Further, the back member is not limited to the backlight unit 102 but may be another member such as a PWB (Printed Wiring Board).

It is sectional drawing which shows an example of a structure of the display module which concerns on this invention. It is a top view which shows an example of a structure of the display module which concerns on this invention. It is a manufacturing process figure for demonstrating the manufacturing method of the display module which concerns on this invention. It is sectional drawing which shows the structure of the conventional display module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Liquid crystal display module 101 Liquid crystal display panel 102 Backlight unit 103 Flexible substrate 104 Clip 105 Solder 106 Light source 107 Double-sided adhesive tape 108 Element substrate 109 Opposite substrate 110 Non-viewing side polarizing plate 111 Viewing side polarizing plate 112 Light guide plate 113 Frame 114 Light source storage 115 Adhesive pad

Claims (8)

A display panel;
A flexible substrate connected to the display panel;
A back member disposed on the back side of the display panel;
A display module comprising:
Provided on the flexible substrate, by bending the flexible substrate to the back member side of the display panel, an adhesive pad located near the end of the back member;
A display module comprising solder for bonding the adhesive pad and the back member.   The display module according to claim 1, wherein the adhesive pad and the back member are bonded to a surface of the back member opposite to the display panel facing surface.   3. The display module according to claim 1, wherein the end portion of the back member has a metal material exposed at a bonding portion between the bonding pad and the back member.   The display module according to claim 1, wherein an adhesive clip made of a metal material is provided at the end of the back member, and the adhesive pad and the back member are bonded via the adhesive clip.   The display module according to claim 4, wherein a width in a direction along a side surface of the end portion of the adhesive pad is smaller than a width in a direction along a side surface of the end portion of the adhesive clip.   The display module according to any one of claims 1 to 5, further comprising an adhesive that is provided on a surface of the back member opposite to the display panel facing surface and bonds the flexible substrate and the back member.   The display module according to claim 1, wherein the back member is a backlight unit. A light source provided on the flexible substrate;
The display module according to claim 7, wherein the light source is housed in the backlight unit by bending the flexible substrate.

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