JP4711529B2 - Liquid crystal display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device used in portable electronic devices and small electronic devices.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a liquid crystal display device including a liquid crystal panel in a display unit such as a portable electronic device and a small electronic device is often used. Since such electronic devices are often carried, they are often subjected to external force due to impact during dropping or vibration during transportation, and the impact force or vibration adversely affects the liquid crystal panel. For this reason, a method for absorbing the impact force and vibration is proposed in, for example, Japanese Patent Laid-Open No. 10-123487.
[0003]
[Problems to be solved by the invention]
However, the conventional method of absorbing impact force and vibration has a problem in that the structure is complicated, such as holding the outer periphery of the liquid crystal panel via an elastic body, the space is increased, and the cost is increased. Further, in the case of holding only the elastic body, the liquid crystal panel is damaged or the printed wiring film substrate connected to the liquid crystal panel (hereinafter referred to as TAB: Tape Automated Bonding) due to the deformation of the elastic body accompanying an increase in mass due to the increase in size of the liquid crystal panel. ) Was damaged and insufficient to maintain quality. Therefore, there is a demand for a liquid crystal display device that easily absorbs impact force and vibration and has a buffer function that is easy to implement.
[0004]
The present invention has been made to meet such a demand, and an object of the present invention is to provide a liquid crystal display device capable of absorbing impact force and vibration from the outside with a simple and inexpensive structure.
[0005]
[Means for Solving the Problems]
A liquid crystal display device according to the present invention includes a holder having a recess having at least four sides and a liquid crystal panel provided with wiring on one or more sides accommodated in the holder. A positioning cushion material that fills a gap between the holder and the liquid crystal panel provided at a corner portion of the side where the wiring exists, and a contact surface of the holder that a side of the liquid crystal panel that faces the positioning cushion material contacts The positioning cushion material is rotatably held by a pin and a hole with respect to the holder, and a rib is provided on the holder to stop the rotation of the positioning cushion material . With this configuration, vibration and impact force from the outside can be absorbed by the rubber cushion material, and can be protected from being applied to the liquid crystal panel by weakening it. In addition, since it is only necessary to provide a rubber cushion material, it can be realized with a simple structure and at a low cost.
[0007]
In the liquid crystal display device of the present invention, the cushion material has a cutout portion cut out at a substantially right angle so that two corners of the liquid crystal panel are in contact with each other. With this configuration, the liquid crystal panel can be easily and accurately positioned with respect to the holder by arranging the corner of the liquid crystal panel in contact with the notch.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a liquid crystal display device according to an embodiment of the present invention. In the liquid crystal display device 1 shown in FIG. 1, the outer side is covered with a synthetic resin frame 2 composed of an upper frame 2a and a lower frame 2b, and a liquid crystal panel 4 disposed in the frame 2 is formed on the upper frame 2a. It is the structure exposed to the opening part 3 of the front which is. 2 is a perspective view showing the internal structure of the liquid crystal display device by removing the upper and lower frames 2a and 2b, FIG. 3 is an exploded perspective view of the internal structure, and FIG. 4 is an enlarged sectional view taken along the line AA of FIG. . The liquid crystal panel 4 is formed in a quadrangular plate shape as shown in FIG. 8 as a single product. The liquid crystal panel 4 includes TABs 5 that can be bent at three outer edges. The back surface is connected to a printed circuit board (not shown).
[0009]
The holder 6 in which the liquid crystal panel 4 is set is made of a synthetic resin, and a rectangular recess 7 is formed on one surface side, and is made into a flat case shape as a whole. The liquid crystal panel 4 is received in the recess 7. The depth of the recess 7 is formed larger than the thickness of the liquid crystal panel 4 and a printed board (not shown) disposed on the back side of the liquid crystal panel 4. And the printed circuit board can be set in a stacked state. Further, a gap σ1 (see FIG. 4) is provided between the three outer edges to which the TAB 5 is attached and the inner surface of the recess 7 so that the TAB 5 does not come into contact with the inner surface of the recess 7 by the gap σ1. Yes. The gap σ1 is secured by the cushion material 8 disposed in the holder 6. Furthermore, the hard sheet 13 extended along the outer edge is arrange | positioned in the outer edge upper part of the right-and-left both sides of the liquid crystal panel 4, and the clearance gap (sigma) 2 (refer FIG. 4) exists between the inner surface of the recess 7 and the hard sheet 13. Is provided. By making the gap σ2 smaller than σ1, even if the cushion material 8 is deformed by an external impact force or vibration, the hard sheet 13 comes into contact with the inner surface of the recess 7 and the TAB 5 is in contact with the inner surface of the recess 7. I try not to touch it.
[0010]
Further, a mounting rib 9 is integrally provided in a portion in the recess 7 corresponding to the three outer edges to which the TAB 5 of the liquid crystal panel 4 is mounted, and in the portion where the mounting rib 9 is provided. The mounting rib 9 functions as the inner surface of the recess 7. The mounting rib 9 is not connected to adjacent comrades at the left and right corner portions. That is, as can be easily understood by looking at FIG. 7 which is an enlarged perspective view of the portion B in FIG. 3, a gap is provided between them. Further, a positioning pin 10 is integrally formed toward the opening direction at substantially the center in each corner portion.
[0011]
The cushion material 8 is made of rubber and is a small piece as shown as a single item in FIG. 6, and is attached to each of the left and right corner portions in the recess 7. The thickness of the cushion material 8 is substantially equal to the depth of the recess 7, and a positioning hole 11 into which the positioning pin 10 is inserted is provided at the center, and adjacent mounting ribs 9 are disposed at both ends. A slit 12 into which the end is inserted is formed. Further, the inwardly facing portion is cut out by providing two surfaces 8a and 8b that are substantially perpendicular to each other, and is formed as a portion that receives a corner portion of the liquid crystal panel 4, that is, a corner portion. Then, the cushioning material 8 allows the positioning pin 10 to be inserted into the positioning hole 11 and the left and right slits 12 to be easily understood by looking at FIG. 5 which is an enlarged plan view of the portion C in FIG. The end portions of the mounting ribs 9 are inserted and positioned and mounted on the respective corner portions. Further, after the cushion material 8 is mounted in this manner, the liquid crystal panel 4 is mounted in the recess 7, and the corner portions of the liquid crystal panel are brought into contact with the surfaces 8a and 8b and positioned.
[0012]
In the liquid crystal display device 1 configured as described above, the cushion material 8 is attached to the left and right two positions before the liquid crystal panel 4 is mounted in the recess 7. Thereafter, the liquid crystal panel 4 to which the printed circuit board and the TAB 5 are attached is placed in a state in which the two left and right corner portions 4a where the outer edges to which the TAB 5 are attached are in contact with and positioned on the surfaces 8a and 8b. Drop it into place 7 and place it. The liquid crystal panel 4 dropped into the recess 7 in this way is positioned with three outer edges positioned by the cushioning material 8 and the remaining one outer edge is in direct contact with the inner surface of the recess 7. The Further, in the state of being positioned in the recess 7, a gap σ 1 is provided between the outer edge where the TAB 5 is provided and the mounting rib 9, and the TAB 5 is the inner surface of the recess 7 (the mounting rib 9). To avoid direct contact.
[0013]
Further, a hard sheet 13 extending along the outer edge is arranged on the upper left and right outer edges of the liquid crystal panel 4, and the gap σ2 is smaller than σ1 between the inner surface (mounting rib 9) of the recess 7. By providing, even if the cushion material 8 is deformed by an external impact force or vibration, the hard sheet 13 comes into contact with the inner surface of the recess 7 and the TAB 5 does not come into contact with the inner surface of the recess 7. This is because, when an impact force or vibration is applied from the outside, the TAB 5 is sandwiched between the inner surface (the mounting rib 9) of the recess 7 and the outer edge of the liquid crystal panel 4, and the printed wiring is damaged. The TAB 5 is prevented from being rubbed and damaged by the inner surface (mounting rib 9) of the recess 7.
[0014]
Therefore, in the liquid crystal display device according to the present embodiment configured as described above, a rubber cushion material 8 that can be obtained at low cost between the outer edge of the liquid crystal panel 4 and the inner surface of the recess 7 of the holder 6. Since the external vibration and impact force are absorbed by the cushion material 8, the structure that can weaken the influence on the liquid crystal panel 4 and protect the liquid crystal panel 4 can be manufactured at low cost without increasing the cost. realizable.
[0015]
Further, a hard sheet 13 that extends along the outer edge of the liquid crystal panel 4 and that can be obtained at a low cost is disposed on the outer edge of the left and right sides of the liquid crystal panel 4, and the outer edges and holders of the liquid crystal panel 4 and the TAB 5 provided by the cushion material 8 By providing a gap σ2 smaller than the gap σ1 with the inner surface of the recess 7 between the hard sheet 13 and the inner surface of the recess 7, the movement of the liquid crystal panel 4 due to impact force or vibration is suppressed, and the liquid crystal A structure that can weaken the influence on the panel 4 and the TAB 5 and protect the liquid crystal panel 4 and the TAB 5 can be realized at low cost without increasing the cost.
[0016]
In the above-described embodiment, the structure in which the rubber cushion material 8 is provided only at the two left and right corner portions where the outer edges to which the TAB 5 is attached intersects is disclosed, but the four corner portions are disclosed. A structure may be provided in which one is provided.
[0017]
In the above-described embodiment, the structure in which the hard sheets 13 are provided at the two left and right positions of the liquid crystal panel 4 is disclosed, but the structure may be provided at each of the left and right and the upper side to which the TAB 5 is attached.
[0018]
【The invention's effect】
As described above, the liquid crystal display device according to the present invention absorbs external vibration and impact force to protect the liquid crystal panel and suppress the failure and improve the reliability, as is clear from the above embodiment. The excellent effect of being able to be expected can be expected.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a perspective view showing an internal structure of the liquid crystal display device according to the embodiment. FIG. 4 is an enlarged sectional view taken along line AA in FIG. 2. FIG. 5 is an enlarged plan view of a portion C in FIG. 2. FIG. 6 is a cushioning material in the liquid crystal display device of the present embodiment. FIG. 7 is an enlarged perspective view of a portion B in FIG. 3. FIG. 8 is a perspective view of a liquid crystal panel unit in the liquid crystal display device of the present embodiment.
1 Liquid Crystal Display 2 Frame 4 Liquid Crystal Panel 5 TAB
6 Holder 7 Recess 8 Cushion material 8a, 8b Surface 9 Mounting rib 10 Positioning pin 11 Positioning hole 12 Slit 13 Hard sheet σ1 Clearance (TAB bent portion and holder inner surface)
σ2 Clearance (hard sheet end face and holder inner face)

Claims (2)

In a liquid crystal display device comprising a holder having a recess having at least four sides and a liquid crystal panel having wiring provided on one or more sides accommodated in the holder, the corner of the side where the wiring of the liquid crystal panel exists A positioning cushion material that fills a gap between the holder and the liquid crystal panel provided in a portion; and a contact surface of the holder that a side of the liquid crystal panel that faces the positioning cushion material contacts, and the positioning cushion A liquid crystal display device , wherein a material is rotatably held by a pin and a hole with respect to the holder, and a rib is provided on the holder to prevent the positioning cushion material from rotating .  2. The liquid crystal display device according to claim 1, wherein the cushion material has a cutout portion that is cut out at a substantially right angle so that two corners of the liquid crystal panel are in contact with each other.

Images