JP2000155306A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a robust display device which hardly fails in spite of the exertion of large external force thereon by providing the display device with a spacer held in tight contact with the rear surface side of the holder of a liquid crystal display element via a flexible printed circuit board interposed therebetween. SOLUTION: The liquid crystal display element(LCD) 1 with its display surface side faced upward is mounted on the front surface side of the holder 2 and is held by the rib 3 of the holder 2. The flexible printed circuit board(FPC) 5 is bent to the rear surface side of the holder 2 from the notched part of the rib 3 of the holder 2. A rubber connector 10 is stuck onto the connecting terminal of the FPC 5. The holder 2 mounted with the LCD 1 and the FPC 5 is mounted and fixed to the main body flexible printed circuit board 11. One surface of the spacer 21 is brought into tight contact with the rear surface side of the holder 2 via the flexible printed circuit board 5. Further, the other surface of the spacer 21 comes into tight contact with the main body flexible printed circuit board 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device using a liquid crystal display element applied to a display of a portable telephone or the like.

[0002]

2. Description of the Related Art A display device using a liquid crystal display element is applied to various electronic devices including a portable terminal. Normal,
The liquid crystal display element is configured to be able to withstand external forces applied from outside the electronic device by being held in a holder and mounted inside the electronic device. However, the thickness of the case is becoming thinner in mobile phones that are becoming smaller and lighter. Therefore, an external force is easily transmitted to the liquid crystal display element, and a measure against breakage is desired.

FIGS. 5 to 9 show a conventional display device in which a liquid crystal display element is mounted on a holder. FIG. 5 shows a state in which the liquid crystal display element is mounted on the holder when viewed from the display surface side of the liquid crystal display element. FIG. 6 is an external view of the state where the liquid crystal display element is mounted on the holder as viewed from the back side of the holder. FIG. 7 is an external view showing the state where the holder with the liquid crystal display element is mounted on the main body printed circuit board. 8 is a sectional view showing a state where the holder is mounted on the main body printed circuit board, and FIG. 9 is an external view showing a state where the liquid crystal display element and the holder are mounted on the mobile phone.

In each of the drawings, reference numeral 1 denotes a liquid crystal display element (hereinafter, referred to as a liquid crystal display element).
It is called LCD. ), 2 is a holder for mounting the LCD 1 on the front side, 3 is a rib formed on the holder 2 along the periphery of the LCD 1, and a portion corresponding to one side of the rectangular LCD 1 is not formed with a rib. It has a notch. Reference numeral 4 denotes locking pawls provided at four places on the back side edge of the holder 2, and reference numeral 5 denotes a flexible printed circuit board (hereinafter referred to as an FPC and a FPC), which is connected to one side of the LCD 1 and has an LCD drive circuit for controlling display of the LCD. ) Is electrically connected to the LCD and welded and bonded by heat treatment. 6 is an electronic component mounted on the FPC 5, 7 is an FP
A positioning hole 8 formed in C5 is a connection terminal formed at an end of the FPC 5.

In FIG. 6, reference numeral 9 denotes a projection provided on the back surface of the holder 2, which is inserted into the hole 7 of the FPC 5 when the FPC 5 is bent toward the back surface of the holder 2 as shown in FIG. It is. Numeral 10 denotes a rubber connector having elasticity, which is interposed between the connection terminal 8 and a connection terminal of a main body printed circuit board to be described later to electrically connect the two connection terminals.

In FIG. 7, reference numeral 11 denotes a main body printed circuit board on which main electric circuit components of a portable telephone are mounted, and 12 denotes a claw 4 of a holder 2 which is formed at four edges of the main body printed circuit board 11 and is placed. Notches to engage.

In FIG. 8, reference numeral 13 denotes a front case of a portable telephone, 14 denotes a display window, and 15 denotes an elastic body such as rubber inserted between the LCD 1 and the front case 13.

In FIG. 9, reference numeral 16 denotes a flip provided on a front case so as to be rotatable, 17 denotes a speaker mounted on a main body printed board, 18 denotes a microphone, and 19 denotes a microphone.
Is a rear case.

Next, a procedure for assembling the display device in the conventional portable telephone configured as described above will be described.

First, as shown in FIG. 5, when the LCD 1 is mounted on the front side of the holder 2 with the display side of the LCD 1 facing upward, the LCD 1
Is held by the rib 3 of the holder 2. The FPC 5 is bendable, and bends from the cutout portion of the rib 3 of the holder 2 to the back side of the holder 2. The folded holder 5 is positioned by inserting the hole 7 into the projection 9 as shown in FIG. Then, the rubber connector 10 is pasted on the connection terminal 8 of the FPC 5 by gluing.

As described above, the holder 2 on which the LCD 1 and the FPC 5 are mounted is attached to the main body printed circuit board 11 as shown in FIG. At this time, the rubber connector 10 elastically contacts the connection terminal 20 of the main body printed circuit board 11 to make an electrical connection with the connection terminal of the FPC 5. Further, the main body printed board 11 is provided with a hole 27 into which the projection 9 is inserted for alignment with the holder 2.

FIG. 8 is a sectional view showing a state in which the display device is assembled to the portable telephone by the above procedure.

[0013]

Since the conventional display device is constructed as described above, when an external force is applied as shown by an arrow in FIG. 8, the LCD 1 may be damaged.
That is, even when an external force is applied to the center of the display window 14, LC
The gap between D1 and the display window 14 was a small gap of about 1 mm, and the display window 14 was deformed and sometimes collided with the LCD 1 to be damaged.

For example, a more robust structure is required for a portable telephone, and a structure that does not break even when an external force of about 30 kg is applied as an impact is desired. As a result of the experiment, 24Kg
Was sometimes damaged by external force.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a strong display device which is hardly damaged even when a large external force is applied.

[0016]

According to a first aspect of the present invention, there is provided a display device having a liquid crystal display element mounted on a front surface side and a part cut away along a peripheral portion of the liquid crystal display element. Flexible mounting a drive circuit that is electrically connected at one end of the liquid crystal display element to a holder having a rib, is bent at a cutout portion of the rib, and is disposed on the back side of the holder, and controls a display of the liquid crystal display element. It consists of a printed circuit board and a spacer closely contacting the back side of the holder with the flexible printed circuit board interposed.

A display device according to a second aspect of the present invention is mounted on a main body printed circuit board together with electronic components, and has a liquid crystal display element mounted on a front surface side, and one along the periphery of the liquid crystal display element. A holder having a rib formed by notching a portion, and electrically connected at one end of the liquid crystal display element, and bent at the notch portion of the rib and arranged on the back side of the holder to control display of the liquid crystal display element. A flexible printed circuit board on which a drive circuit to be mounted is mounted, and a spacer having one surface adhered to the back surface of the holder and the other surface adhered to the main body printed circuit board with the flexible printed circuit interposed therebetween. It is.

According to a third aspect of the present invention, in the display device, a liquid crystal display element having a display surface opposed to a display window of an electronic device case is placed on the front side and along a peripheral portion of the liquid crystal display element. , A holder having a rib formed by cutting out a part, and electrically connected at one end of the liquid crystal display element,
A flexible printed circuit board mounted with a drive circuit for controlling the display of the liquid crystal display element, which is bent at the cutout portion of the rib and disposed on the back surface of the holder, and closely attached to the back surface of the holder with the flexible printed circuit interposed therebetween; And a reinforcing rib provided on the notch side of the spacer, and the reinforcing rib and the rib of the holder are configured to protrude so as to be in contact with the electronic device case.

The invention according to a fourth aspect of the present invention is the display device according to any one of the first to third aspects, wherein the spacer is locked and held by the holder.

According to a fifth aspect of the present invention, there is provided the display device according to any one of the first to third aspects, wherein the spacer is provided with a notch at a position corresponding to a component mounting position on the flexible printed circuit board. It is what was constituted.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 3 show a first embodiment of the present invention. FIG. 1 is an external view of a holder on which an LCD and an FPC are mounted, as viewed from the back side.
FIG. 2 is an external view showing a state where the spacer according to the first embodiment is mounted on a holder, and FIG. 3 is a cross-sectional view showing a state where the display device according to the first embodiment is assembled to a mobile phone.

In each of the figures, reference numeral 21 denotes a spacer, and a hole 22 through which the projection 5 passes when mounted on the back surface of the holder 2 and an FPC.
A notch 23 for accommodating the fifth electronic component 6 is provided, and a protrusion 24 is provided at an end. 25 is convex part 2
4 and a hole for fixing the spacer 21 to the holder 2.

That is, as shown in FIG. 2, the convex portion 24 of the spacer 21 is attached by engaging with the hole 25 of the holder 2. At this time, the projection 9 is passed through the hole 22 and the FPC
6 is accommodated in the notch 23.

FIG. 3 is a cross-sectional view when the display device according to the first embodiment is assembled to a portable telephone. As can be seen from FIG.
1 is in close contact with the flexible printed circuit board 5 so that the holder 2 can be moved to the spacer 2 against external force.
1 is reinforced. Furthermore, in this embodiment, since the other surface of the spacer 21 is in close contact with the main body printed board 11, the holder 2 is also held by the main body printed board 11.
It can be reinforced. Embodiment 2 FIG. In the first embodiment, as shown in FIG. 3, an impact can be transmitted to the main body printed circuit board 11 by the rib 3 against the external force F1 and a sufficient reinforcing effect can be exerted. Since the ribs are notched, the reinforcing effect cannot be sufficiently exhibited.

The second embodiment shown in FIG. 4 is such that a sufficient reinforcing effect can be exerted against external force F2.

That is, the spacer 21 according to the second embodiment is provided with a reinforcing rib 26 protruding from the notch portion of the holder 2 so as to be in contact with the front case 13.
The reinforcing ribs can transmit the impact of the external force F2 to the main body printed board 11, so that a sufficient reinforcing effect can be exhibited.

The inventors conducted an impact test for applying an external force to a portable telephone to which this configuration was applied. As a result, even if an external force of 30 kg or more was applied, the LCD was not damaged, and it was confirmed that a sufficient effect was obtained.

In the second embodiment, the reinforcing ribs 26 are used.
Although it is configured to directly contact the front case 13, an elastic material or the like may be interposed between the two, and it is sufficient that the external force is transmitted to the main body printed board 21. The same applies to the ribs 3 in the first and second embodiments for transmitting the external force F1 to the main body printed circuit board 11.

[0029]

As described above, according to the present invention, L
The spacer is closely attached to the back of the holder that holds the CD to reinforce the holder.
It is possible to prevent the CD from being damaged.

If the spacer is interposed between the LCD and the main body printed circuit board, the reinforcing effect can be further obtained.

Further, when a reinforcing rib is provided on the spacer to transmit an external force applied to the case, a further reinforcing effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an external view of a holder on which a liquid crystal display element and a flexible printed circuit board are mounted in a display device according to Embodiment 1 of the present invention, as viewed from the back surface side.

FIG. 2 is an external view showing a state in which the spacer according to Embodiment 1 of the present invention is mounted on a holder.

FIG. 3 is a cross-sectional view showing a state where the display device according to Embodiment 1 of the present invention is assembled to a mobile phone.

FIG. 4 is a sectional view showing a state where the display device according to Embodiment 2 of the present invention is assembled to a mobile phone.

FIG. 5 is an external view of a state where a conventional liquid crystal display element is mounted on a holder, as viewed from the display surface side of the liquid crystal display element.

FIG. 6 is an external view of a state in which a conventional liquid crystal display element is mounted on a holder, as viewed from the back side of the holder.

FIG. 7 is an external view showing a state in which a holder on which a conventional liquid crystal display element is mounted is mounted on a main body printed circuit board.

FIG. 8 is a cross-sectional view showing a state where a conventional holder is mounted on a main body printed circuit board.

FIG. 9 is an external view showing a state where a liquid crystal display element and a holder are mounted on a conventional mobile phone.

[Explanation of symbols]

Reference Signs List 1 liquid crystal display element, 2 holder, 5 flexible printed circuit board, 11 main body printed circuit board, 13
Front case, 21 spacer, 23 notch,
26 Reinforcing ribs.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H089 HA40 QA04 QA11 TA01 2H092 GA50 NA25 5G435 AA09 BB12 EE03 EE04 EE05 EE13 EE36 EE47 FF00 LL07

Claims (5)

[Claims] 1. A holder having a liquid crystal display element mounted on a front surface side and having a rib formed by cutting a part along a peripheral portion of the liquid crystal display element, and electrically connected at one end of the liquid crystal display element. A flexible printed circuit board mounted with a drive circuit for controlling the display of the liquid crystal display element, which is bent at the cutout portion of the rib and disposed on the back side of the holder, and adheres closely to the back side of the holder with the flexible printed board interposed. A display device, comprising: 2. A holder which is mounted on a main body printed board together with electronic components, has a liquid crystal display element mounted on a front surface side, and has a rib formed by cutting a part along a periphery of the liquid crystal display element. A flexible printed circuit board that is electrically connected at one end of the liquid crystal display element, is bent at the cutout portion of the rib, and is disposed on the back side of the holder, and includes a drive circuit for controlling display of the liquid crystal display element; A display device, comprising: a spacer having one surface in close contact with the back surface of the holder and the other surface in close contact with the main body printed circuit board with a substrate interposed therebetween. 3. A liquid crystal display element having a display surface facing a display window of an electronic device case is placed on the front side, and a rib is formed along the periphery of the liquid crystal display element by cutting out a part thereof. A flexible printed circuit board mounted with a drive circuit for controlling the display of the liquid crystal display element, the holder being electrically connected at one end of the liquid crystal display element, being bent at the notch of the rib and arranged on the back side of the holder; A spacer is provided in close contact with the back side of the holder with a flexible printed circuit board interposed therebetween, and a reinforcing rib provided on the notch side of the spacer is provided. The reinforcing rib and the rib of the holder are in contact with the electronic device case. A display device characterized by protruding from the display device. 4. The display device according to claim 1, wherein the spacer is locked and held by a holder. 5. The display device according to claim 1, wherein the spacer is provided with a cutout at a position corresponding to a component mounting position on the flexible printed circuit board.