JP2982736B2 - Liquid crystal display - Google Patents

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 narrow frame liquid crystal display device having a narrow non-display portion around a display portion.

[0002]

2. Description of the Related Art As shown in FIG. 4, for example, a conventional liquid crystal display device has a pressure contact portion 10 in which input terminals of display elements inside a liquid crystal panel 4 are extended to the outside of the panel, and a tape carrier 2 on a connection substrate 9. The liquid crystal driving semiconductor component 1 mounted thereon is electrically connected to the liquid crystal driving semiconductor component 1 by pressing the conductive component 3 via the conductive adhesive 3.

A liquid crystal driving signal output from the liquid crystal driving semiconductor component 1 is input to the liquid crystal panel 4 via the pressure contact portion 10 and an image is displayed on the liquid crystal panel 4.

[0004] In order to protect these electric circuit components from the outside, the surroundings are generally wrapped by an upper case 16 and a lower case 17 made of sheet metal or synthetic resin. It is necessary to fix the liquid crystal panel 4 and the electric circuit components inside the case so that the liquid crystal panel 4 and the electric circuit components do not move or be damaged by vibration, impact, or the like.
May be fixed. Further, a recess or projection for dropping the liquid crystal panel 4 is provided on the lower case 17, and elasticity is provided between the press contact portion 10 and the upper case 16, that is, between the press contact portion 10 and the inner surface of the upper case 16 parallel to the surface of the press contact portion. There is a method of fixing the liquid crystal panel 4 by sandwiching the elastic member 15 having a property, pressing the lower surface of the elastic member 15 and pressing the liquid crystal panel 4 with an appropriate pressure.

It is effective to fix the liquid crystal panel 4 by pressing the pressure contact portion 10 of the liquid crystal panel 4 with an elastic member. The reason for this is that it is more excellent in repairability than when it is fixed with an adhesive member. Further, since the pressure contact portion 10 of the liquid crystal panel 4 and the terminal of the semiconductor component 1 for driving the liquid crystal are simply connected via the conductive adhesive 3, there is a possibility that peeling may occur due to surrounding heat. There is also an effect of preventing peeling by pressing with an appropriate pressure through the. Such a technique is disclosed in, for example,
No. 2,280,884. The publication further discloses a technique of disposing a rod-shaped rigid body 18 between the carrier tape 2 and the elastic member 15 in order to intensively apply the pressure of the elastic member 15 to the pressure contact portion as shown in FIG. ing.

[0006]

In the prior art, the frame of the liquid crystal display device has been narrowed, and the width of the press-contact portion 10 was 3 mm to 4 mm in the old technology, but 1.5 mm in the current technology.
２2.7 mm. When the width of the compression unit is reduced as described above, the above-described related art has the following problems.

[0007] The first problem is that the cost of the elastic member increases.

The reason is that, considering the position crossing where the elastic member 15 is attached to the case and the positional variation of other parts, for example, when the width of the compression section 10 is 2 mm, the elastic member 1
The width of 5 must be less than 1.0 mm. When the width of the elastic member 15 is larger than the press-contact portion 10, the elastic member 15 rides on a portion other than the press-contact portion 10 of the liquid crystal panel 4, or as shown in FIG. This is because, when riding, a problem such as disconnection of the tape carrier 2 of the liquid crystal driving semiconductor component 1 occurs due to the edge thereof. When producing the elastic member 15 having a width of 1.0 mm or less, when a plurality of strip-shaped elastic members 5 having a width of 1 mm or less are cut at once from a base material of a sheet-like elastic member by a mold, a gap between teeth to be cut is formed. In order to cause troubles such as the clogging of the elastic member 5, one elastic member 5 is formed from the sheet-like base material.
Since one piece is cut and manufactured, the manufacturing cost is increased.

The second problem is that the upper case 16 has a width of 1.0.
The operation of sticking the elastic member 5 of 5 mm straight is quite difficult, and the cost is increased due to an increase in the number of manufacturing steps.

A third problem is that, as shown in FIG. 6, when a method of disposing a rod-like rigid body 18 between the elastic member 15 and the carrier tape 2 is adopted, the number of rigid members increases and the elastic member is assembled. The cost increases due to the increase in man-hours.

On the other hand, for example, when the cross section of the elastic member is made triangular instead of making the width of the elastic member 2 mm or more, and the liquid crystal panel 4 is pressed at its apex, the elastic member is processed into a special shape. A mold or the like is required, which increases costs.

Accordingly, an object of the present invention is to provide a liquid crystal display device having a liquid crystal panel fixing structure which does not impair connection reliability between a carrier tape for transmitting a liquid crystal driving signal and the liquid crystal panel in a liquid crystal display device having a small frame portion around the display surface. It is to provide a device.

Another object of the present invention is to provide a liquid crystal display device having a small frame portion around the display surface and having a liquid crystal panel fixing structure without deteriorating assemblability.

Another object of the present invention is to provide a liquid crystal display device having a small frame portion around the display surface and a structure for fixing the liquid crystal panel without cost.

[0015]

A feature of the present invention is that a terminal of a tape carrier having a semiconductor component for driving a liquid crystal is connected to a terminal of a liquid crystal panel through a conductive adhesive to cover portions other than a display portion. In a liquid crystal display device wrapped by a case and a lower case, an inclined surface is provided in the upper case with respect to a surface of a pressure contact portion of the liquid crystal panel, an elastic member is attached to the inclined surface, and a bottom side of the elastic member is provided. The corners are in the pressed liquid crystal display. Here, it is preferable that an obtuse angle of the inclined surface with respect to the surface of the press contact portion is not less than 5 degrees and not more than 15 degrees. Further, the inclined surface may be formed by drawing. Alternatively, the inclined surface can be formed by a molding process.

According to the present invention, the surface formed by the line force is inclined with respect to the press contact portion of the liquid crystal panel, and the angle of the elastic member stuck on the line force comes into contact with the press contact portion due to the inclination. As described above, since the liquid crystal panel is fixed at the corners of the elastic member, the narrow pressure contact portion can be pressed by the wide elastic member.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a sectional view of FIG. It is sectional drawing to which the part was expanded.

Referring to FIG. 1, an outer periphery of a planar liquid crystal panel 4 is covered by an upper case 6 surrounded by a line force 8, and a portion surrounded by the upper case and the lower case. That is, FIG. 2 shows an enlarged frame portion around the display surface.

Referring to FIG. 2, an input terminal of a display element inside the liquid crystal panel 4 is extended to the outside of the panel.
0, the back surface on one end side of the tape carrier 2 is adhered by a conductive adhesive 3 and further pressed by an elastic member 5, and the back surface on the other end side of the tape carrier 2 is adhered to the connection substrate 9 and The mounted liquid crystal driving semiconductor component 1 is mounted by a tape carrier, and the liquid crystal driving semiconductor component 1 is electrically connected to the input terminal of the press contact portion 10.
As a result, the liquid crystal driving signal output from the liquid crystal driving semiconductor component 1 is input to the liquid crystal panel 4 via the pressure contact portion 10 and an image is displayed on the liquid crystal panel 4.

In order to protect these electric circuit components from the outside, the surroundings are enclosed by an upper case 6 and a lower case 7.

In the embodiment shown in FIG. 2, the upper case 6 is mainly made of a metal such as iron, stainless steel or aluminum, or a synthetic resin such as ABS resin or polycarbonate.

The upper case 6 is provided with a line force 8 having an inclined concave portion by drawing.
In this embodiment, since the line force 8 for providing the inclined surface 6A of the present invention is formed by drawing, the inclined surface can be provided without increasing the number of manufacturing steps of the upper case 6.

On the back surface of the line force 8, a thickness of 0.3 to 1.0 mm and a width of 1.5 to 3.0 m made of silicon rubber, sponge rubber, natural rubber, foamed urethane, or the like.
By attaching the elastic member 5 having a rectangular cross section of a right angle of about m, the elastic member 5 is inclined with respect to the surface of the liquid crystal panel 4.

The pressing portion 10 of the liquid crystal member 4 is pressed by the corners of the elastic member 5 to fix the liquid crystal panel 4.

The position of the line force 8 is set at a position where the angle of the elastic member 5 is located at the center of the press contact portion 10. The inclination of the triangular line force 8, that is, the obtuse angle of the inclined surface with respect to the surface of the press contact portion 10 is 5 to 15 degrees. Is preferable in consideration of assemblability and the like. The inclination angle of the inclined surface, the elastic member 5
Hardness (IRHD) is in the range of about 40 to 70 degrees.
When the width of 0 is 2 mm, the width is adjusted so that the width of the contact between the corner of the elastic member 5 and the press contact portion is 0.5 to 1.0 mm.

FIG. 3 is a sectional view showing a second embodiment of the present invention. Note that, in FIG. 3, portions having the same or similar functions as those in FIG. 1 are denoted by the same reference numerals, and duplicate description will be omitted.

In the second embodiment, a synthetic resin is used as the material of the upper case 11, and the inclined convex surface (inclined surface) such as the line force 8 of the first embodiment is formed by molding with a mold. ) The shape of the upper case 11 having 11A is formed.

In this embodiment, since the material of the upper case 11 is resin molding using a mold, the height and inclination angle of the convex surface 11A can be easily processed with high accuracy.

[0030]

As described above, the present invention has a special structure in which the pressure contact portion of the panel is pressed by the corner of the elastic member attached to the back of the inclined surface formed by the line force applied to the upper case. The panel can be fixed without using an elastic member having a narrow shape and a narrow width.

Therefore, a first effect of the present invention is that even if the liquid crystal panel has a press contact width of 2 mm or less, the liquid crystal panel can be fixed without impairing the connection reliability of the press contact portion.

The second effect of the present invention is that the cost of the elastic member does not increase because it is not necessary to use a special shape or a narrow elastic member.

A third effect of the present invention is that it is not necessary to extremely narrow the width of the elastic member, so that the workability at the time of sticking does not deteriorate, and as a result the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 cut along a plane AA and enlarging a peripheral portion.

FIG. 3 is a cross-sectional view showing a liquid crystal display device according to a second embodiment of the present invention, corresponding to FIG.

FIG. 4 is a cross-sectional view showing a conventional liquid crystal display device.

FIG. 5 is a cross-sectional view showing the problem of FIG.

FIG. 6 is a cross-sectional view showing another conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semiconductor component for liquid crystal drive 2 Tape carrier 3 Conductive adhesive 4 Liquid crystal panel 5 Elastic member 6 Upper case 6A Inclined surface 7 Lower case 8 Line force 9 Connection board 10 Press-contact part 11 Resin upper case 11A Inclined surface 15 Elastic member 16 Upper case 17 Lower case 18 Bar-shaped rigid body

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G09F 9/00 G02F 1/1333 G02F 1/1343 G02F 1/1345 G02F 1/135 G02F 1/136

Claims (4)

(57) [Claims] 1. A liquid crystal wrapped in an upper case and a lower case which is connected to terminals of a liquid crystal panel via a conductive adhesive with terminals of a tape carrier having semiconductor parts for driving a liquid crystal to terminals of a liquid crystal panel. In the display device, the upper case may be provided with an inclined surface with respect to a surface of a press-contact portion of the liquid crystal panel, an elastic member may be attached to the inclined surface, and a bottom side corner of the elastic member may be pressed. Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein the angle of the inclined surface with respect to the surface of the press contact portion is 5 to 15 degrees. 3. The liquid crystal display device according to claim 1, wherein the inclined surface is formed by drawing. 4. The liquid crystal display device according to claim 1, wherein the inclined surface is formed by a molding process.