JP2000056700A - Liquid crystal display device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which permits automatic insertion of liquid crystal display unit terminals to a printed wiring board without deform of terminals, and is excellent in assembling workability. SOLUTION: This liquid Crystal display device is provided with a lamp housing 7 having an open top and a lamp insertion hole 11 on the bottom, a liquid crystal display unit 1 mounted on an upper opening end of the lamp housing 7, with lots of terminal pins 3 hanging down, a lot of terminal mounting holes 24 in which each terminal pin 3 of liquid crystal display unit 1 is inserted for mounting the unit, and a printed circuit board 6 having a lamp mounting hole 21, and angular guide projections 14 having terminal pitch correction slopes 15 on both sides are provided at the position corresponding to those outside of the sidewall of the lamp housing 7 and between the terminal pins 3 of the liquid crystal display unit 1 and; terminal insertion holes 8 are formed at the root parts between the guide projections 14; and guide faces (extended parts 17) tilted toward the terminal insertion holes are arranged at the upper positions of the terminal insertion holes between the guide projections 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a liquid crystal display (LC).
More particularly, the present invention relates to a backlight type structure including a printed wiring board, a lamp housing, and a liquid crystal display unit, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In a backlight type liquid crystal display device, a liquid crystal display unit is illuminated by a backlight. However, a backlight is arranged between the liquid crystal display unit and a printed wiring board so that the liquid crystal display unit is substantially uniform from behind. In order to illuminate, the distance between the liquid crystal display unit and the printed wiring board needs to be increased to some extent.

[0003]

If the distance between the liquid crystal display unit and the printed wiring board is increased, the length of each terminal of the liquid crystal display unit inserted into the printed wiring board is inevitably increased. As a result, the gaps between the ends of the terminals are not uniform, or the ends of the terminals are not aligned neatly and the alignment of the ends is poor. Poor nature,
In addition, there is a disadvantage that the terminal is deformed and becomes difficult to insert.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to automatically insert terminals of a liquid crystal display unit into a printed wiring board without deforming the terminals and to provide a liquid crystal display with good assembling workability. It is an object of the present invention to provide an apparatus and a method for manufacturing the same.

[0005]

According to a first aspect of the present invention, there is provided a lamp housing having an upper opening and a lower lamp insertion hole, and a plurality of terminal pins provided vertically. It has a liquid crystal display unit mounted on the upper open end of the lamp housing, a number of terminal mounting holes into which the respective terminal pins of the liquid crystal display unit are inserted and mounted, and a printed wiring board having a lamp mounting hole. .

A substantially mountain-shaped guide projection having a terminal pitch correcting inclined surface on both sides is provided at a position on the outer surface of the side wall of the lamp housing between terminal pins of the liquid crystal display unit, and the guide projection and the guide are provided. The terminal insertion hole is formed at the base between the projections, and furthermore, between the guide projections, at a position above the terminal insertion hole, inclined toward the terminal insertion hole side, for example, by an expansion portion described later. A guide surface is provided.

According to a second aspect of the present invention, there is provided a liquid crystal display unit having an opening at an upper side and a lamp insertion hole at a lower side at a position corresponding to between terminal pins of a liquid crystal display unit on an outer surface of a side wall. A substantially mountain-shaped guide protrusion having a terminal pitch correction inclined surface on both sides was provided, a terminal insertion hole was formed at the base between the guide protrusions, and a locking portion was provided at a position facing the printed wiring board. A lamp housing,
A liquid crystal display unit having a large number of terminal pins suspended therefrom, a large number of terminal mounting holes into which the respective terminal pins of the liquid crystal display unit are inserted and mounted, and a locked portion that engages with a locking portion of the lamp housing; A printed wiring board having a lamp mounting hole is provided.

The lamp housing is positioned on the printed wiring board by the engagement between the locking portion and the locked portion, and the lamp insertion hole communicates with the lamp mounting hole.
A step of superimposing each terminal insertion hole on each terminal mounting hole, and lowering the liquid crystal display unit from above the positioned lamp housing with the terminal facing down, and guiding each terminal pin by the guide of the chevron guide. And a step of inserting the through hole into the terminal mounting hole.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the first aspect of the present invention has a terminal pitch correcting inclined surface on both sides of the outer surface of the side wall of the lamp housing at a position corresponding to between the terminal pins of the liquid crystal display unit. Since the angled guide projections are provided, even if the terminal pin pitches are not uniform by inserting the terminal pins between the guide projections, the terminal pitch is automatically corrected by the terminal pitch correction inclined surface.

Further, since a guide surface inclined toward the terminal insertion hole is provided at a position above the terminal insertion hole between the guide protrusions, the terminal pin is inserted along the guide surface, whereby the terminal is inserted. The unevenness of the pin row is automatically corrected.

As described above, each terminal pin is guided by the three sides of the terminal pitch correcting inclined surface, which is substantially V-shaped by the guide projections on both sides, and the guide surface provided therebetween, so that the terminal pins can be easily formed. It is arranged in order, there is no deformation of the terminal, etc., and the automatic insertion of the liquid crystal display unit terminal becomes possible,
Productivity can be improved.

According to the second invention, as described above, the lamp housing is first positioned on the printed wiring board, and the terminal insertion hole of the lamp housing is overlapped with the terminal mounting hole of the printed wiring board. Lowering the terminal onto the lamp housing, correcting the terminal pin pitch on the terminal pitch correcting slope of the lamp housing, automatically guides the terminal pins to the terminal insertion holes, and inserts them into the terminal mounting holes through the terminal insertion holes. And the liquid crystal display unit terminals can be automatically mounted, thereby improving productivity.

Next, an embodiment of the present invention will be described with reference to FIGS.
It will be explained together. FIG. 1 is a plan view of a liquid crystal display unit,
FIG. 2 is a front view showing a part of the liquid crystal display unit in cross section, FIG. 3 is a side view showing a part of the liquid crystal display unit in cross section, and FIG.
5 is a plan view of the lamp housing, FIG. 5 is a front view of the lamp housing, FIG. 6 is a sectional view taken along line 6-6 of FIG. 4, FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 4, and FIG. FIG. 9 is a partial plan view of the substrate, and FIG. 9 is a diagram for explaining the assembly of the liquid crystal display device.

As shown in FIGS. 1 to 3, the liquid crystal display unit 1 has a polarizing plate 2 mounted on an upper surface and a lower surface. Although not shown, a transparent substrate, a liquid crystal layer and a transparent substrate are provided between the two polarizing plates 2. Electrodes and the like are interposed. A large number of terminals 3 are suspended from both sides of the liquid crystal display unit 1, and holding portions 4 each having a substantially U-shaped bent portion at the head of each terminal 3 as shown in FIG. 3.
Are provided, and the terminal 3 is fixed by the holding portion 4 and the adhesive 9.

As shown in FIG. 3, a bent portion 5 which is slightly bent inward is formed at an intermediate position in the longitudinal direction of the terminal 3. The bent portion 5 is formed to absorb heat shock when soldering to the printed wiring board 6 and to facilitate insertion into the terminal insertion hole 8 of the lamp housing 7.

The lamp housing 7 is made of a synthetic resin molded body, has openings at upper and lower sides, and has a substantially square tubular shape in plan view. The peripheral portion of the upper opening is the mounting portion 10 of the liquid crystal display unit 1, and the lower opening is formed substantially at the center as shown in FIG.

As shown in FIGS. 4 and 5, guide protrusions 14 are provided at predetermined lower positions on the outer surfaces of the front side wall 12 and the rear side wall 13 of the lamp housing 7 at predetermined intervals. Has a terminal pitch correction inclined surface 15,
It gradually tapers toward the top, and has a chevron shape with a rounded upper end. Therefore, the guide projection 1
A substantially V-shaped terminal pitch correcting inclined surface 15, 15 is formed between 4 and the adjacent guide projection 14.

As shown in FIG. 5, the guide projections 14 are connected to each other at the base portion, and are connected to the terminal pitch correcting inclined surface 15 between the guide protrusions 14 of the connection portion and penetrate toward the lower surface. A through-hole-shaped terminal insertion hole 8 is formed.

As shown in FIG. 7, a tapered surface 1 inclined toward the terminal insertion hole 8 is formed on the periphery of the upper end opening of the terminal insertion hole 8.
6 are provided. The front wall 12 and the rear wall 1
3, above the upper end opening of the terminal insertion hole 8 and between the adjacent terminal pitch correcting inclined surfaces 15, 15.
An extended portion 17 is formed to be slightly inclined toward the side so as to make a business trip. The surface of the extended portion 17 is the guide surface of the present invention.

As shown in FIG. 4, the extension 17 of the front side wall 12 is formed.
The distance L1 between the terminal insertion hole 8 on the outside of the terminal 3 and the terminal insertion hole 8 on the outside of the extended portion 17 of the rear wall 13 is larger than the distance L2 between the lower ends 3a of the terminals 3 provided in the front and rear rows shown in FIG. It is designed slightly wider (L1> L2). As shown in FIG. 5 and FIG.
1, a positioning projection 18 and an elastic locking piece 1
9 are provided two by two.

As shown in FIG. 8, a lamp mounting hole 21 and positioning holes 22 and locking holes 23 are formed on both sides of the printed wiring board 6, respectively.
A row of terminal mounting holes 24 is formed before and after that. The terminal mounting holes 24 of the printed wiring board 6 are designed at the same pitch as the terminal insertion holes 8 of the lamp housing 7. Although not shown, a predetermined conductive pattern is formed on the printed wiring board 6, and a solder land is provided on the back surface side of the terminal mounting hole 24.

To assemble the liquid crystal display device, a backlight (not shown) is inserted into the lamp mounting hole 21 of the printed wiring board 6 and mounted. Then, as shown in FIG. The lamp housing 7 is positioned and fixed on the printed wiring board 6 by inserting the positioning projections 18 into the positioning holes 22 and elastically inserting the locking pieces 19 into the locking holes 23. Terminal insertion hole 8 and printed wiring board 6
The terminal mounting holes 24 overlap each other, and the lamp insertion hole 11 communicates with the lamp mounting hole 21.

Next, the liquid crystal display unit 1 is lowered from above the lamp housing 7 with the terminal 3 down, and the lower end 3a of the terminal 3 is inserted between the guide projections 14 so that the lower end 3a has a V-shape. The liquid crystal display unit 1 moves along the terminal pitch correcting inclined surface 15 and is guided by the inclined surface 15.
So that there is no play on the lamp housing 7,
Positioning in the left-right direction (X direction in FIG. 9) is performed.

When the liquid crystal display unit 1 is further lowered, the lower end 3a of the terminal 3 rides on the extended portion 17 of the lamp housing 7 as shown in FIG.
Are slightly elastically pushed outward, and the distance L2 (see FIG. 3) between the terminals 3 in front and behind the liquid crystal display unit 1 is forcibly expanded. As the lower end 3a of the terminal 3 rides on the extension portion 17 in this manner, the liquid crystal display unit 1 is prevented from rattling with respect to the lamp housing 7 by the guide of the extension portion 17 (Y in FIG. 7). Direction).

When the liquid crystal display unit 1 is further lowered, the lower end 3a of the terminal 3 is automatically inserted into the terminal insertion hole by the respective guides of the terminal pitch correcting inclined surface 15 on the left and right and the expansion portion 17 (guide surface) on the rear. 8 is guided to the upper end opening. At this time, if the lower end 3a of the terminal 3 is excessively outward, the tapered surface 1 at the upper end opening of the terminal insertion hole 8 is formed.
6 (see FIG. 7), it is automatically guided into the terminal insertion hole 8.

As described above, the pitch between the terminals 3 is automatically adjusted by the four guiding functions of the terminal pitch correcting inclined surface 15 on the left and right, the expansion portion 17 (guide surface) on the rear side, and the tapered surface 16 on the front side. Since the terminals 3 are automatically aligned and aligned, the lower end 3a of the terminal 3 passes through the terminal insertion hole 8 and directly passes through the terminal mounting hole 24 of the printed wiring board 6. Lower end 3a protruding from the back surface of printed wiring board 6
Are soldered in a later step, and the liquid crystal display unit 1 is electrically connected to the printed wiring board 6.

In this embodiment, the backlight is attached to the printed wiring board 6 before the lamp housing 7 and the like are attached to the printed wiring board 6.
The backlight can be attached to the printed wiring board 6 after attaching the lamp housing 7 and the like to the printed circuit board 6.

[0028]

As described above, according to the first aspect of the present invention, the terminal pitch correcting inclined surfaces are provided on both sides of the outer surface of the side wall of the lamp housing at positions corresponding to between the terminal pins of the liquid crystal display unit. Is provided, the terminal pins are inserted between the guide projections, so that even if the terminal pin pitches are not uniform, the terminal pitch is corrected automatically by the terminal pitch correction inclined surface.

Further, since a guide surface inclined toward the terminal insertion hole is provided above the terminal insertion hole between the guide protrusions, the terminal pins are inserted along the guide surface, whereby the terminal is inserted. The unevenness of the pin row is automatically corrected.

As described above, since each terminal pin is guided by the three sides of the terminal pitch correcting inclined surface having a substantially V-shape by the guide projections on both sides and the guide surface provided therebetween, the terminal pins can be easily connected. It is arranged in order, there is no deformation of the terminal, etc., and the automatic insertion of the liquid crystal display unit terminal becomes possible,
Productivity can be improved.

According to the second and fifth aspects of the present invention, the positioning of the liquid crystal display unit in the left-right direction (X direction) with respect to the lamp housing is performed by guide projections having terminal pitch correction inclined surfaces on both sides, and the liquid crystal display unit is positioned relative to the lamp housing. Positioning in the front-rear direction (Y direction)
Since the distance between the front terminal pin row and the rear terminal pin row of the liquid crystal display unit is increased by the guide surfaces formed on the front side wall and the rear side wall of the lamp housing,
It is possible to simultaneously position the liquid crystal display unit in two directions.

According to the third and sixth aspects of the present invention, the terminal of the liquid crystal display unit is provided with a bent portion bent inward at an intermediate portion of the terminal, so that the terminal of the liquid crystal display unit is soldered to the printed wiring board. In this case, the heat shock is absorbed by the bent portion, and the lower end of the terminal of the liquid crystal display unit can be favorably aligned with the guide surface of the lamp housing by the elasticity following the bent portion.
Terminal insertion is smooth.

According to a second aspect of the present invention, as described above, the lamp housing is first positioned on the printed wiring board, and the terminal insertion hole of the lamp housing is overlapped with the terminal mounting hole of the printed wiring board. The liquid crystal display unit is lowered onto the lamp housing, and the terminal pitch is automatically guided to the terminal insertion hole while correcting the terminal pin pitch on the terminal pitch correction inclined surface of the lamp housing, and inserted into the terminal mounting hole through the terminal insertion hole. , There is no deformation of the terminal,
It has features such as the ability to automatically mount the liquid crystal display unit terminals and improve productivity.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display unit used in a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a front view showing a part of the liquid crystal display unit in section.

FIG. 3 is a side view in which a part of the liquid crystal display unit is sectioned.

FIG. 4 is a plan view of a lamp housing used for the liquid crystal display device.

FIG. 5 is a front view of the lamp housing.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. 4;

FIG. 8 is a partial plan view of a printed wiring board used for the liquid crystal display device.

FIG. 9 is a diagram for explaining the assembly of the liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Liquid crystal display unit 3 Terminal 3a Lower end of terminal 5 Bending part 6 Printed wiring board 7 Lamp housing 8 Terminal insertion hole 11 Lamp insertion hole 12 Front side wall 13 Rear side wall 14 Guide projection 15 Terminal pitch correction inclined surface 16 Tapered surface 17 Expansion portion 18 Positioning protrusion 19 Locking piece 21 Lamp mounting hole 22 Positioning hole 23 Locking hole 24 Terminal mounting hole L1 Distance between terminal insertion hole on front wall and terminal insertion hole on rear wall of lamp housing L2 Front terminal pin array of liquid crystal display unit And the distance between the rear terminal pin row

Claims (6)

[Claims] A lamp housing having an upper opening and a lamp insertion hole at a lower position; a liquid crystal display unit having a number of terminal pins suspended therefrom mounted on an upper opening end of the lamp housing; A plurality of terminal mounting holes into which each terminal pin of the display unit is inserted and mounted, and a printed wiring board having a lamp mounting hole, between the terminal pins of the liquid crystal display unit on the outer surface of a side wall of the lamp housing. At a corresponding position, a substantially mountain-shaped guide projection having a terminal pitch correcting inclined surface on both sides is provided, and the terminal insertion hole is formed at a root portion between the guide projections. A liquid crystal display device, wherein a guide surface inclined toward the terminal insertion hole is provided above the terminal insertion hole. 2. The liquid crystal display unit according to claim 1, wherein a terminal pin array is provided on a front side and a rear side of the liquid crystal display unit, and the guide projection, the terminal insertion hole and the guide surface are formed on a front side wall and a rear side wall of the lamp housing. And the distance L1 between the terminal insertion hole on the front wall and the terminal insertion hole on the rear wall.
Is larger than the distance L2 between the lower end of the front terminal pin row and the lower end of the rear terminal pin row of the liquid crystal display unit (L1> L).
2) The positioning of the liquid crystal display unit in the left-right direction (X direction) with respect to the lamp housing is performed by guide projections having the terminal pitch correcting inclined surfaces on both sides, and the positioning of the liquid crystal display unit in the front-rear direction (Y direction) with respect to the lamp housing. Wherein the distance between the front terminal pin row and the rear terminal pin row of the liquid crystal display unit is extended by guide surfaces formed on the front side wall and the rear side wall of the lamp housing. apparatus. 3. The liquid crystal display device according to claim 1, wherein a bent portion bent inward is provided at an intermediate portion of the terminal of the liquid crystal display unit. 4. A substantially mountain-like shape having an opening at an upper side, a lamp insertion hole at a lower side, and a terminal pitch correcting inclined surface on both sides at a position corresponding to between terminal pins of the liquid crystal display unit on an outer surface of a side wall. A lamp housing provided with a guide projection, a terminal insertion hole formed at the base between the guide projections, and a locking portion provided at a position facing the printed wiring board, and a number of terminal pins are vertically provided. A printed circuit board having a liquid crystal display unit, a large number of terminal mounting holes into which the respective terminal pins of the liquid crystal display unit are inserted and mounted, a locked portion that engages with a locking portion of the lamp housing, and a lamp mounting hole. Positioning the lamp housing on the printed wiring board by the engagement of the locking portion and the locked portion, communicating the lamp insertion hole with the lamp mounting hole, and forming each terminal insertion hole. A step of overlapping the terminal mounting holes, and lowering the liquid crystal display unit from above the positioned lamp housing with the terminals facing down, and guiding each terminal pin into the terminal mounting hole through the terminal insertion hole by the guide of the chevron guide. A method for manufacturing a liquid crystal display device, comprising a step of inserting. 5. The liquid crystal display unit according to claim 4, wherein a row of terminal pins is provided on a front side and a rear side of the liquid crystal display unit, and between the angled guide protrusions on the outer surface of the side wall of the lamp housing and above the terminal insertion hole. A guide surface inclined toward the terminal insertion hole is provided, and the guide protrusion, the terminal insertion hole, and the guide surface are formed on a front wall and a rear wall of the lamp housing, and a terminal insertion hole on the front wall and a terminal insertion on the rear wall. Hole spacing L1
Is larger than the distance L2 between the lower end of the front terminal pin row and the lower end of the rear terminal pin row of the liquid crystal display unit (L1> L).
2) When the liquid crystal display unit is mounted on the lamp housing, positioning of the liquid crystal display unit in the left-right direction (X direction) with respect to the lamp housing is performed by guide projections having the terminal pitch correction inclined surfaces on both sides. Positioning of the liquid crystal display unit in the front-rear direction (Y direction) extends the distance between the front terminal pin row and the rear terminal pin row of the liquid crystal display unit by the guide surfaces formed on the front and rear side walls of the lamp housing. A method for manufacturing a liquid crystal display device. 6. The method for manufacturing a liquid crystal display device according to claim 4, wherein a bent portion bent inward is provided in a middle portion of the terminal of the liquid crystal display unit.