JP2002131726A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which attaching a print board to the case member holding a liquid crystal cell can be carried out in one action. SOLUTION: In the liquid crystal display device 1, a snap engaging part 7 is formed in the back side of a first case 5 as a case member and the print board 6 is engaged by snapping with the snap engaging part 7. The snap engaging part 7 has a base part 7a protruding from the back face of the first case 5 to the outside of the first case 5 and a hook part 7b formed by folding the base part 7a into a U-shape. The hook part 7b is formed in such a manner that its top end touches the surface of the print board 6 to support the print board 6 in the thickness direction. Thus, the print board 6 can be attached in one action to the snap engaging part 7 as well as the movement of the print board in the thickness direction after attached can be definitely regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a printed circuit board mounted on the back of a case member holding a liquid crystal display cell.

[0002]

2. Description of the Related Art In the field of conventional liquid crystal display devices, not only are they used as display devices installed in offices and homes, but also applications to mobile devices such as electronic notebooks and personal digital assistants are remarkable. is there. In these mobile devices, for example, when switching various functions such as calendar display, schedule display, and address book management, the functions are switched by touching the tablet on the icon on which the desired function is displayed with a pen or the like. Things have been suggested.

[0003] Alternatively, there has been proposed a device in which a desired image can be input by handwriting by drawing an image of a character or the like with a pen or the like on a tablet. Such a conventionally proposed liquid crystal display device 31 will be described with reference to FIG. 7. A liquid crystal cell 34 in which liquid crystal (not shown) is sealed between a pair of insulating substrates 32 and 33 is held in a liquid crystal case 35. ing. The liquid crystal case 35 has a side wall 35a with which the outer peripheral portion of the liquid crystal cell 34 contacts, and a bottom plate 35b that covers the back surface of the liquid crystal cell 34.

A tablet 36 is provided above the liquid crystal cell 34 in the figure, and the tablet 36 is held in a tablet case 37. Further, a metal frame 38 made of a metal plate is formed in a box shape so that a liquid crystal case 35 for holding the liquid crystal cells 34 in a stacked state and a tablet case 37 for holding the tablet 36 can be stored in a box shape. An opening 38a for exposing an operation area (not shown) is formed.

A liquid crystal display 35 is assembled by storing a liquid crystal case 35 holding a liquid crystal cell 34 and a tablet case 38 holding a tablet 36 in a metal frame 38 in a stacked state. Such a conventionally proposed liquid crystal display device 31 has a liquid crystal case 35.
A printed circuit board 39 on which electric components (not shown) for controlling the driving of the liquid crystal cell 34 and the like are mounted on the rear side of the bottom plate 35b.

[0006]

However, the liquid crystal case 3
Since the mounting of the printed circuit board 39 to 5 was performed using a double-sided adhesive tape (not shown) or the like, the assemblability was poor. Printed circuit board 39 attached with double-sided adhesive tape
However, there is a possibility that the printed circuit board 39 may collide with parts or the like on the mobile phone side when the mounting position varies and the mobile phone is incorporated into the mobile phone or the like. SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal device that solves the above-described problems and allows one-touch mounting of a printed circuit board to a case member holding a liquid crystal cell.

[0007]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal cell; and a tablet disposed in front of the liquid crystal cell. A case member for holding the cell is provided, a printed circuit board attachable to the back surface of the case member, a snap engagement portion is formed on the back surface side of the case member, and the print engagement portion is formed on the snap engagement portion. The substrate was mounted by snap engagement.

As a second means for solving the above problems, the snap engagement portion includes a base protruding outward from the case member from the back surface of the case member, and And a hook portion bent in the shape of a letter. The hook portion has a tip portion abutting against the surface of the printed circuit board so as to be able to lock in the thickness direction of the printed circuit board.

According to a third aspect of the present invention, the case member has a board holding portion capable of holding at least one corner of the printed board, and the printed board is The corner portion is held by the substrate holding portion, and the outer peripheral end face side of the side opposed to the corner portion held by the substrate holding portion is snap-engaged with the snap engagement portion.

According to a fourth aspect of the present invention, the corner portion is held by the substrate holding portion, and the outer peripheral end is positioned on the snap engagement portion. By pressing the printed circuit board toward the case member, the base portion and the hook portion are elastically deformed, and the hook portion contacts the surface of the printed circuit board to regulate the movement of the printed circuit board in the thickness direction. Such a configuration was adopted.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device of the present invention will be described with reference to the drawings. First, FIG. 1 is an exploded perspective view of the liquid crystal display device of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 3 is a perspective view of a snap engagement portion according to the present invention, and FIG. FIG. 5 is a plan view in which a printed board is attached to a case member according to the present invention. FIG. 5 is a perspective view of a board holding section according to the present invention. FIG. FIG.

A liquid crystal device 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 5. First, as shown in FIG. 2, a liquid crystal cell 2 is made up of two upper and lower rectangular glass plates. A pair of insulating substrates 3 and 4 are disposed to face each other, and a liquid crystal (not shown) is sealed between the pair of insulating substrates 3 and 4. Further, a pair of insulating substrates 3 in which liquid crystal is sealed,
A polarizing plate (not shown) is stuck on the upper surface of 4.

A reflecting member (not shown) is attached to the lower surface of the liquid crystal cell 2 shown in the figure, which is the rear surface. To be emitted. In such a liquid crystal cell 2, as shown in FIG. 1, a flexible printed board 2b connected to a driver IC 2a mounted for driving the liquid crystal cell is disposed at an end of a lower substrate 4. This flexible printed board 2b is connectable to a printed board 6 described later.

The first case 5, which is a case member for holding the liquid crystal cell 2, is made of a resin material, and has a side wall 5a surrounding the outer periphery of the liquid crystal cell 2, and a bottom plate 5b covering the entire back surface of the liquid crystal cell 2. Are formed. Further, a plurality of hook portions 5c are formed on the side wall 5a so that an engaging portion 11d of the metal frame 11 described later can be engaged. A printed circuit board 6 as shown in FIG. 2 is attached to the back surface of the bottom plate 5b of the first case 5. The printed circuit board 6 includes a flexible printed circuit board 2b of the liquid crystal cell 2.
And a flexible printed circuit board 9a of the tablet 9 described later can be connected. The printed board 6
As shown in FIG. 2, a snap engagement portion 7 formed on the back surface of the bottom plate 5b so as to project outward from the first case 5, and a bottom plate 5b.
b and the substrate holder 8 formed near the corner of the first case 5.
It can be attached to the back side of the.

As shown in FIG. 4, the snap engagement portion 7 has a plate-like base 7a projecting outward from the back surface of the first case 5, and is formed by bending this base into a U-shape. A hook 7b, and the base 7a and the hook 7b
The first case 5 is formed simultaneously with the forming process. As shown in FIG. 3, such a snap engagement portion 7 is provided on the first case 5 at a portion where the outer peripheral end surface 6a of the printed circuit board 6 is located.
Formed on the back. Then, the base 7a and the hook 7
b is formed into a plate at the time of molding and has elasticity,
When the hook 7b is pressed by the outer peripheral end surface 6a of the printed circuit board 6, the base 7a and the hook 7b are elastically deformed. The printed circuit board 6 snap-engaged with the snap engagement portion 7 has a front end portion of the hook portion 7b in contact with the surface, so that the movement in the thickness direction is restricted.

As shown in FIG. 5, the first case 5 is provided with a board holding portion 8 capable of holding at least one corner portion 6b of the printed board 6. The board holding section 8 has a pocket section 8a into which the corner section 6b of the printed board 6 can be inserted and held.
When the corner portion 6b of the printed circuit board 6 is moved in the direction of arrow A and inserted, the movement of the corner portion 6b is regulated and held.

The printed circuit board 6 has at least one corner portion 6b held by a board holding portion 8, and the outer peripheral end surface 6a on the side facing the corner portion 6b held by the holding portion 8 is used as a snap engagement portion 7. Snap into the first case 5
It is designed to be attached to. In addition, the first shown in FIG.
A plurality of positioning portions 5d are formed on the bottom plate 5b of the case 5 so as to protrude therefrom. The positioning portions 5d regulate the movement of the printed circuit board 6 mounted on the back surface of the bottom plate 5b in the planar direction.

On the front surface of the upper part of the liquid crystal cell 2 in the figure,
A transparent panel, which is capable of inputting an image such as a character by performing a switching operation by the pressure of a pen or the like, that is, a so-called tablet 9 is provided. The tablet 9 has a plurality of electrodes (not shown) formed at the outer peripheral end. The upper part of this electrode is covered with a resin material such as a resist or the like, is insulated, and is connected to the flexible printed circuit board 9a. An operation area (not shown) in which an image such as a character can be input by operating a pen or the like positioned on the tablet 9 is formed in an area surrounded by the electrodes at an outer peripheral end of the tablet 9. ing.

The second case 10 for holding such a tablet 9 is made of a resin material, and includes a side wall 10a surrounding the outer periphery of the tablet 9 and a cross-shaped bottom plate 10b for covering the rear surface near the outer periphery of the tablet 9. Are formed. The metal frame 11 for housing the first case 5 holding the liquid crystal cell 2 and the second case 10 holding the tablet 9 in a laminated state is made of a stainless plate or the like, and is bent as shown in FIG. It is formed in a box shape by processing or the like.

The metal frame 11 has a lower portion opened and its periphery covered with a side plate 11a, and an opening 11 for exposing an operation area (not shown) of the tablet 9 is formed in an upper plate 11b.
c is formed. The side plate 11a is formed with a plurality of slit-shaped engaging portions 11d by punching, and the hook portions 5c of the first case 5 can be snap-engaged with the engaging portions 11d.

In the liquid crystal display device 1 having such a configuration, the procedure for attaching the printed board 6 to the first case 5 is as follows: first, the pocket portion 8a of the board holding portion 8 shown in FIG.
The printed circuit board 6 is moved in the direction of arrow A to
Insert b. At this time, the outer peripheral end surface 6a on the side facing the corner portion 6b held by the substrate holding portion 8 is located on the snap engagement portion 7 as shown in FIG. 6A. In this state, a pressing load is applied from above the printed circuit board 6 below the arrow B.

Then, the printed circuit board 6 descends along the inclined surface of the hook 7b, and the hook 7b is pushed by the outer peripheral end face 6a to bend toward the base 7a. At the same time, the base 7a also bends outwardly in the direction of arrow C and flexes. Then, when the printed board 6 is further pressed below the arrow B, the printed board 6 comes into close contact with the bottom plate 5b of the first case 5 as shown in FIG. By contact, the movement of the printed circuit board 6 in the thickness direction is regulated.

Such a snap engagement portion 7 can easily snap-engage the printed circuit board 6 with the snap engagement portion 7 even if the load in the direction of arrow B applied to the printed circuit board 7 is small. Further, the printed circuit board 6 which has been snap-engaged with the snap engagement portion 7 can be taken out by bending the hook portion 7b toward the base portion 7a, thereby making repair and the like easy.

In the embodiment of the present invention, one substrate holding portion 8 and two snap engaging portions 7 are provided. However, two substrate holding portions 8 can hold two adjacent corner portions 6a. The substrate holding portions 8 are formed, and the two corner portions 6 are formed.
outer peripheral end face 6a opposite to outer peripheral end face 6a sandwiched between
A single snap engaging portion 7 may be provided on the side. If there is only one snap engagement portion 7, it is easy to take out the printed board 6 after the snap engagement, and the repairability is further improved. Although the board holding part 8 has been described as holding the corner part 6b of the printed board 6, the board holding part is formed in a hook shape (not shown), and this hook-shaped board holding part is 7 may be formed at a position facing the outer peripheral end face 7 so as to be in contact with the outer peripheral end face 6 a of the printed circuit board 6.

[0025]

According to the liquid crystal display device of the present invention, the snap engagement portion is formed on the back side of the case member, and the printed circuit board is snap-engaged with the snap engagement portion.
A printed circuit board can be attached to a case member with one touch, and a liquid crystal display device with good assemblability can be provided.

The snap engagement portion has a base protruding outward from the case member from the back surface of the case member, and a hook formed by bending the base in a U-shape. Since the hook portion has a tip portion abutting against the surface of the printed circuit board and can be locked in the thickness direction of the printed circuit board, the base portion and the hook portion can have elasticity, and the snap engagement portion can be provided. On the attached printed circuit board,
Even if a shock or the like is applied from the outside, the shock can be absorbed by the snap engagement portion.

Further, the case member has a board holding portion capable of holding at least one corner portion of the printed board, and the printed board holds the corner portion on the board holding portion, The outer peripheral end face side opposite to the snap engagement portion is snap-engaged with the snap engagement portion, so that even if external vibrations or the like are transmitted to the printed board by the board holding portion and the snap engagement portion, the printed circuit board is It does not come off from the member.

Further, the printed circuit board is pressed toward the case member while the corner portion is held by the board holding portion and the outer peripheral end portion is positioned on the snap engagement portion. The base portion and the hook portion are elastically deformed, and the hook portion comes into contact with the surface of the printed circuit board so as to restrict the movement of the printed circuit board in the thickness direction. It can be attached and is easy to assemble. Further, the printed circuit board to which the case member is attached can be easily removed from the case member by pressing and deforming the hook member toward the base side, thereby providing a liquid crystal display device excellent in repairability.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a perspective view of a snap engagement portion according to the present invention.

FIG. 4 is a plan view in which a printed board is attached to a case member according to the present invention.

FIG. 5 is a perspective view of a substrate holding unit according to the present invention.

FIG. 6 is a diagram illustrating an operation when a printed circuit board is attached to a snap engagement portion according to the present invention.

FIG. 7 is a sectional view of a main part of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal cell 3 Insulating substrate 4 Insulating substrate 5 1st case 5a Side wall 5b Bottom plate 5c Hook part 5d Positioning part 6 Printed circuit board 6a Outer peripheral end surface 6b Corner part 7 Snap engaging part 7a Base 7b Hook part 8 Substrate holding part 8a Pocket 9 Tablet 10 Second Case 11 Metal Frame

Claims (4)

[Claims] A liquid crystal cell; a tablet disposed in front of the liquid crystal cell; a case member holding the liquid crystal cell; and a printed circuit board attachable to the rear surface of the case member. A liquid crystal display device, wherein a snap engagement portion is formed on the back side of the case member, and the printed circuit board is snap-engaged with the snap engagement portion. 2. The snap engagement portion includes a base protruding outward from the case member from the back surface of the case member, and a hook formed by bending the base in a U-shape. 2. The liquid crystal display device according to claim 1, wherein a tip portion of the hook portion abuts on a surface of the printed circuit board so as to be able to lock a thickness direction of the printed circuit board. 3. The case member has a board holding portion capable of holding at least one corner portion of the printed board, and the printed board holds the corner portion on the board holding portion. 3. The snap engaging portion according to claim 1, wherein the outer peripheral end face side of the side opposed to the corner portion held by the portion is snap-engaged with the snap engaging portion.
Or the liquid crystal display device according to 2. 4. The printed circuit board is pressed toward the case member while the corner portion is held by the board holding portion and the outer peripheral end portion is positioned on the snap engagement portion. The said base part and the said hook part were elastically deformed, The said hook part was made to contact the surface of the said printed circuit board, and was made to restrict | limit the movement of the said printed circuit board in the board thickness direction, or, The said, 3. The liquid crystal display device according to 3.