JP3395176B2 - Mounting structure of liquid crystal display element - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a liquid crystal display device having a plurality of electrode leads in a row on a circuit board.

[0002]

2. Description of the Related Art A conventional mounting structure for a liquid crystal display device is disclosed in Japanese Utility Model Laid-Open No. 4-65484. This type of liquid crystal display element mounting structure includes an electrode lead arranged in a row on one side, and a transmissive liquid crystal display element in which the electrode lead is lead-formed from the liquid crystal display portion in a substantially vertical direction in a case. An insert formed on the circuit board, which is arranged on the upper end portion, and the electrode leads of the liquid crystal display element are arranged so as to correspond to a plurality of groove portions or partition portions such as insertion holes, which are arranged separately from each other. After inserting the electrode lead into the hole, the electrode lead and the circuit board are fixed by soldering. In addition, the liquid crystal display element has a structure in which the liquid crystal display element is inserted from the back surface side of the circuit board corresponding to a position where the case is disposed and electrically connected to the circuit board, for example, is transmitted and illuminated by an illumination bulb. is there.

In the mounting structure of the liquid crystal display element on the circuit board, when the electrode leads are arranged in the insertion holes of the circuit board, the electrode leads are arranged in rows and the electrode leads are arranged. Since it is easily deformed, it is difficult to set it in the insertion hole unless a dedicated jig is used. In consideration of this problem, the electrode lead is formed so as to be in a substantially vertical direction from the liquid crystal display unit, whereas the forming angle of the electrode lead is inward from the vertical direction (vertical direction). (The angle at which the electrode lead becomes an acute angle with respect to the direction) Lead forming, and when the liquid crystal display element is arranged at the upper end portion of the case, by bringing the electrode lead into contact with the partition portion, Positioned and arranged, in this state the electrode lead is inserted into the insertion hole of the circuit board,
After arranging the case on the circuit board, a structure is adopted in which the electrode leads protruding to the back surface side of the circuit board are electrically fixed to a connection land formed on the circuit board by soldering.

[0004]

For example, when the liquid crystal display element having the mounting structure as described above is used as a vehicle display device, when the ambient temperature changes due to various use environments,
Due to the difference in thermal expansion coefficient between the circuit board and the case, stress strain occurs between both members. In the mounting structure of the liquid crystal display element described above, since the electrode leads are arranged in contact with the case (partition portion) even after being soldered to the circuit board, the stress of the electrode leads is The amount of displacement due to strain is larger than that when the electrode lead is arranged in a free state with respect to the circuit board, because the electrode lead fluctuates with the case, and the solder between the electrode lead and the circuit board is increased. There was a risk that solder cracks would occur at the attachment part.

In view of the above problems, the present invention is directed to a liquid crystal which does not cause solder cracks in the soldered portions between the electrode leads of the liquid crystal display element and the circuit board even when stress distortion is caused by thermal expansion. A mounting structure for a display device is provided.

[0006]

In order to solve the above-mentioned problems, the present invention provides a liquid crystal display element, a case body having a mounting portion for disposing the liquid crystal display element, and a row on the liquid crystal display element. Electrodes arranged in a circular shape and arranged so as to contact at least a part of the case body when the liquid crystal display element is arranged in the mounting portion, and an insertion hole for inserting the electrode lead. And a circuit board that is electrically connected to the electrode lead and that disposes the case body,
A first positioning part provided on the circuit board; and a second positioning part provided on the case body for determining a position of the case body with respect to the circuit board and engaging with the first positioning part. A guide portion which is formed at a tip portion of the electrode lead and which guides the electrode lead into the insertion hole,
A bent portion that is formed behind the guide portion and that, when the positioning portions are engaged with each other, shifts the electrode lead from a state in which the electrode lead is in contact with the case body to a state in which the electrode lead is separated from the case body. is there.

Further, the case body is provided with a partition portion for arranging the electrode leads so as to be separated from each other.

The first positioning portion is a through hole penetrating the front and back of the circuit board, and the second positioning portion is a boss body extending from the case body. It is formed by engaging with a boss.

Further, the case body and the circuit board are formed with first and second locking portions, and the locking portions are engaged with each other.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a mounting structure for mounting a liquid crystal display element 1 on a circuit board 4. A guide part formed on the electrode lead 2 (2 ') in a state where the electrode lead 2 (2') is held in the case body 3 by being brought into contact with the groove portion (partition portion) 7 (7 ') formed on the case body 3. 2e
(2e ′) is provided in the insertion hole 11 (11 ′) of the circuit board 4, and the boss body (second positioning portion) 9 provided in the case body 3 is provided.
Is inserted into (engaged with) the through hole (first positioning portion) 16 of the circuit board 4, the guide portion 2e (2e ') and the inclined portion 2d (2d') formed on the electrode lead 2 (2 '). ), The bent portion 2c (2c ′) of the electrode lead 2 (2 ′) is arranged in the insertion hole 11 (11 ′), so that the electrode lead 2 (2 ′) is removed from the case body 3. It can be held on the circuit board 4 in a separated state. Therefore, since the electrode lead 2 (2 ′) can be disposed and fixed on the circuit board 4 without being brought into contact with the case body 3, the ambient temperature changes and the difference in the thermal expansion coefficient between the case body 3 and the circuit board 4 is caused. Even when stress distortion occurs, the electrode lead 2 (2 ') does not change together with the case body 3, so that the land portion 12 (12') of the circuit board 4 and the electrode lead 2 (2 ') Since the stress strain in the soldered portion can be suppressed as compared with the conventional structure, the occurrence of solder cracks can be eliminated.

Further, the electrode lead 2 (2 ') is provided with a through hole 13 penetrating the front and back of the circuit board 4 and a boss body 9 extending from the case body 3, respectively, only by engaging the respective parts. The electrode lead 2 can be moved from the state of being brought into contact with the case body 3 to the state of being separated from the case body 3.
It is possible to improve the workability of assembling after disposing (2 ′) in the insertion hole 11 (11 ′).

Further, by forming a locking claw (first locking portion) 10 and a locking hole (second locking portion) 14 on the case body 3 and the circuit board 4, respectively, the electrode lead 2 (2 ')
It is possible to dispose and fix the case body 3 on the circuit board 4 while maintaining the state of being separated from the case body 3.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the accompanying drawings.

FIG. 1 is a perspective view showing a mounting structure of a liquid crystal display device according to a first embodiment of the present invention, FIG. 2 is a side view showing a liquid crystal display device according to the first embodiment, and FIGS. FIGS. 5 and 6 are views showing the mounting state of the first embodiment, and FIGS. 5 and 6 are views showing the mounting state of the liquid crystal display element of the second embodiment of the present invention.

A first embodiment will be described with reference to FIGS. 1 to 4.

The liquid crystal display element mounting structure according to the present invention has a liquid crystal display element 1, an electrode lead 2 for applying a voltage to the liquid crystal display element 1, a case body 3, and a circuit board 4.
And an illumination light source 5.

The liquid crystal display element 1 is one in which liquid crystal is sealed between a pair of transparent substrates, and a molecular alignment direction of the liquid crystals is obtained by selectively applying a voltage between electrodes formed on the transparent substrate. Is controlled by the relationship with the polarization axes of the polarizing plates provided on both sides of the display unit, and a predetermined display is performed by using the illumination light beam of the illumination light source 5 provided behind. .

A plurality of electrode leads 2 are arranged in a row on one side of the liquid crystal display element 1 in the longitudinal direction by applying a voltage between the electrodes of the liquid crystal display element 1. As shown in FIG. 2, the electrode lead 2 is connected to an electrode portion (not shown) of the liquid crystal display element 1, is lead-homed in the vertical direction X from the display surface 1a of the liquid crystal display element 1, and is also a liquid crystal display element. 1
At a predetermined angle from the connecting portion 2a of the electrode lead 2 (when the liquid crystal display element 1 is disposed on the mounting portion of the case 3 which will be described later in detail, the electrode lead 2 receives a predetermined pressure in the groove portion of the case body 3). It is bent inward from the vertical direction X with an angle (given and abutted). In addition, a stress absorbing portion 2b is formed near the connecting portion 2a of the electrode lead 2 which is connected to the electrode portion, which prevents the stress due to the deformation of the electrode lead 2 from being directly transmitted to the connecting portion 2a. In addition, a bent portion 2c that is bent and formed outward at a predetermined angle (an angle that facilitates guiding to an insertion hole of the circuit board 4, which will be described in detail later) is formed at a tip portion of the electrode lead 2 on the circuit board 4 side. The bent portion 2c is provided with a guide portion 2e that is bent and formed in the vertical direction X again from the tip of the inclined portion 2d.

The case body 3 is made of, for example, P.P. It is made of a resin material such as P and is composed of a housing. This case body 3 is
A frame-shaped mounting portion 6 for disposing the liquid crystal display element 1 is formed on the upper end portion of the case body 3, and a plurality of groove portions (partitioning portions) 7 for disposing the electrode leads 2 separately from each other are provided. The holder portion 8 provided is formed on the entire surface side of the case body 3. In the groove portion 7 of the holder portion 8, the electrode lead 2 is disposed so as to contact the liquid crystal display element 1 when the mounting portion 6 is disposed. Further, inside the case body 3, a guide portion (not shown) for guiding the illumination light beam from the illumination light source 5 to the liquid crystal display element 1 is formed, and the case body 3 is configured as a light box of the liquid crystal display element 1. To be done.

At the lower end of the case body 3, a pair of boss bodies (second
Positioning portion 9) and a pair of locking claws (first locking portions) 10 provided adjacent to the boss body 9 for disposing and fixing the case body 3 on the circuit board 4. It is formed so as to extend toward the substrate 4.

The circuit board 4 is made of an insulating material such as paper phenol or resin containing glass fiber, and insertion holes 11 penetrating through the front and back of the circuit board 4 are formed in rows so as to correspond to the respective electrode leads 2. ing. A land portion 12 that is electrically connected to the electrode lead 2 is formed around the insertion hole 11 on the back surface side of the circuit board 4. Further, the circuit board 4 has through holes (first holes) corresponding to the bosses 9 of the case body 3.
And a locking hole (second locking part) 14 corresponding to the locking claw 10 of the case body 3 are formed. Further, the circuit board 4 is provided with a mounting hole 15 for the illumination light source 5 arranged from the back surface side of the circuit board 4.

The illuminating light source 5 is composed of, for example, an incandescent lamp such as a tungsten lamp, and emits the illuminating light beam of the liquid crystal display element 1.

Next, the mounting structure of the liquid crystal display element 1 in the first embodiment will be described with reference to FIGS. 3 and 4.

The electrode leads 2 of the liquid crystal display element 1 arranged on the mounting portion 6 of the case body 3 are held in contact with the groove portions 7 of the case body 3. First, the guide portion 2e of the electrode lead 2 is arranged in the insertion hole 11 of the circuit board 4 (see FIG. 3).
(A) ”. In this case, the electrode lead 2 remains in contact with the groove portion 7 of the case body 3. "Figure 3 (b)".

Next, the boss body 9 of the case body 3 is attached to the circuit board 4
When the engaging claw 10 of the case body 3 and the engaging hole 14 of the circuit board 4 are engaged with each other while being inserted (engaged) in the through hole 13 of the electrode lead 2, the electrode lead 2 is inclined from the guide portion 2e to the inclined portion 2d. [FIG. 4 (a)] in which the bent portions 2c are inserted into the insertion hole 11 and are held in a state in which the bent portion 2c is in contact with the wall portion of the insertion hole 11. In this case, the electrode lead 2 has a bent portion with the connection portion 2a as a fulcrum so as to have an inclination of a distance W1 from the wall portion of the insertion hole 11 to the vertical direction X of the electrode lead 2 before being inserted into the insertion hole 11. Since the 2c is disposed in the insertion hole 11, the case body 3
"(B)" in which the state of being in contact with the groove portion 7 of FIG. Therefore, the electrode lead 2 is connected to the case body 3.
It is possible to solder to the land portion 12 of the circuit board 4 in a state of being separated from.

In this embodiment, when the boss body 9 of the case body 1 is inserted into the through hole 13 of the circuit board 4, the electrode lead 2 is moved to a position separated from the groove portion 7 by insertion. The distance W1 from the wall of the hole 11 to the vertical direction X of the electrode lead 2 before being inserted into the insertion hole 11, that is, the distance W1 from the bottom of the groove 7 to the wall of the insertion hole 11 and the electrode lead 2 It is important to set the guide angle θ1 of the inclined portion 2d that guides the electrode lead 2 to the bent portion 2c when the electrode lead 2 is inserted in 11.

In the above-described first embodiment, the guide portion 2e of the electrode lead 2 is inserted into the insertion hole of the circuit board 4 while the electrode lead 2 is held in the groove portion 7 formed in the case body 3 and held in the case body 3. When the boss body 9 provided in the case body 3 is inserted into the through hole 16, the electrode lead 2 is guided by the guide portion 2e.
And the inclined portion 2d are inserted into the insertion hole 11, and the bent portion 2
Since c is arranged in the insertion hole 11, the electrode lead 2 can be held on the circuit board 4 in a state of being separated from the case body 3. Therefore, since the electrode lead 2 can be disposed and fixed on the circuit board 4 in a state where the electrode lead 2 is not in contact with the case body 3 (the electrode lead 2 is free), the ambient temperature changes and the heat of the case body 3 and the circuit board 4 is changed. Even if stress distortion occurs due to a difference in expansion coefficient, the electrode lead 2 does not fluctuate together with the case body 3, so that the stress distortion occurs in the soldered portion between the land portion 12 of the circuit board 4 and the electrode lead 2. As compared with the conventional structure, the occurrence of solder cracks can be eliminated.

Further, a through hole 13 penetrating through the front and back of the circuit board 4 and a boss body 9 extending from the case body 3 are provided respectively, and the electrode leads 2 can be attached to the case body 3 by simply engaging the respective parts. Since it is possible to shift the state in which the electrode lead 2 is brought into contact with the insertion hole 1 to the state in which the electrode lead 2 is separated,
It is possible to improve the assembling workability after the arrangement of No. 1 in FIG.

Further, by forming the locking claws 10 on the case body 3 and the locking holes 14 on the circuit board 4, the case body 3 can be maintained while keeping the electrode leads 2 separated from the case body 3. Can be disposed and fixed on the circuit board 4.

Next, a second embodiment will be described with reference to FIGS. 5 and 6, but the same or corresponding portions as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

In the second embodiment, the liquid crystal display device having the electrode leads 2 arranged in rows on one side is used in the first embodiment, whereas the electrode leads arranged in rows are arranged on both sides. It is different from the first embodiment in that a liquid crystal display element provided is used.

The mounting structure in the second embodiment will be described.
The electrode leads 2 and 2 ′ on both sides of the liquid crystal display element 1 arranged on the mounting portion 6 of the case body 3 have the respective groove portions 7 of the case body 3,
It is held in a state of being in contact with 7 '. First, the guide portions 2e and 2e ′ of the electrode leads 2 and 2 ′ on both sides are arranged in the insertion holes 11 and 11 ′ of the circuit board 4 (FIG. 5A).
In this case, the electrode leads 2 and 2'on both sides are still in contact with the respective groove portions 7 and 7'of the case body 3. "Figure 5
(B) "

Next, when the boss body 9 is inserted into the through hole 13 and the locking claw 10 and the locking hole 14 are engaged with each other,
The electrode leads 2 and 2'on both sides are inserted into the insertion holes 11 and 11 'from the guide portions 2e and 2e' to the inclined portions 2d and 2d ', and the bent portions 2c and 2c' are inserted into the insertion holes 11 and 11 '. "FIG. 6 (a)" held in contact with the wall. In this case, the electrode leads 2 and 2'on both sides have the connection portions 2a and 2a 'as fulcrums from the wall portion of the insertion holes 11 and 11'.
Electrode leads 2'before insertion in 11 ', vertical direction X,
Since the bent portions 2c and 2c ′ are arranged in the insertion holes 11 and 11 ′ so that the bent portions 2c and 2c ′ have the inclinations of W1 and W2 to the X ′, the groove portions 7 and 7 ′ of the case body 3 are provided. "(B)" in which the state of being in contact with is separated from the state of being separated. Therefore, the electrode leads 2 and 2 ′ on both sides can be soldered to the lands 12 and 12 ′ of the circuit board 4 while being separated from the case body 3.

In the second embodiment described above, the electrode leads 2 and 2 ′ on both sides can be arranged on the circuit board 4 while being separated from the case body 3 similarly to the first embodiment.
It is possible to obtain a mounting structure of a light emitting display element capable of eliminating the generation of solder cracks. In the second embodiment, the boss body 9 of the case body 1 is connected to the through hole 13 of the circuit board 4.
The electrode leads 2 and 2'when they are inserted into the groove parts 7 and 7 '
From the insertion hole 11,
Distances W1 and W2 from the wall portion 11 'to the vertical direction X, X'of the electrode leads 2, 2'before insertion of the insertion holes 11, 11'
When the electrode leads 2 and 2'are inserted into the insertion holes 11 and 11 ', the slanted portions 2d and 2d' for guiding the electrode leads 2 and 2'to the bent portions 2c and 2c 'are guided at an angle θ1. θ
The setting of 2 becomes important.

The partition in each of the above-mentioned embodiments is
The electrode lead 2 (2 ′) is formed in the case body 3 by arranging the electrode lead 2 (2 ′) at a distance from each other. However, for example, the electrode lead 2 (2 ′) is separated from the protruding portion protruding from the case body. The electrodes are arranged in rows as shown in FIG.
It may be composed of an insertion hole for arranging (2 ′) at a distance, and the partition part in the present invention is not limited to this embodiment.

In each of the above-mentioned embodiments, the case body 3 is used.
The locking claw 10 and the locking hole 14 are formed in the circuit board 4, but for example, a pair of locking claws (first locking portions) are provided on the circuit board 4 side, and the case body 3 Alternatively, a groove (second locking portion) corresponding to the locking claw may be provided.

Further, the case body 3 of each of the above-described embodiments is provided with the partition portion including the groove portion 7 (7 ') for arranging the electrode leads 2 (2') at a distance. However, in the present invention according to the first aspect, the partition portion does not necessarily have to be provided.

In each of the above-mentioned embodiments, the case body 3 is used.
The boss body 9 and the through hole 13 are provided in the circuit board 4 to engage the respective parts. For example, a positioning pin (first positioning part) is provided on the circuit board 4 side.
On the case body 3 side, there is a hole (second part) corresponding to the positioning pin.
The respective positioning portions) may be provided to engage the respective portions, and the first and second positioning portions according to claim 1 are not limited to the present embodiment.

Further, in each of the above-mentioned embodiments, the bent portion 2c (2c ') of the electrode lead 2 (2') is arranged in the insertion hole 11 (11 ') of the circuit board 4, but it is inserted. Hole 1
Even if the length and the forming shape of the electrode lead 2 (2 ') are changed so that the bent portion 2c (2c') penetrates from 1 (11 '), the same effect as each of the above-described embodiments can be obtained.

[0040]

According to the present invention, since the electrode lead can be mounted on the circuit board in a state of being separated from the case body in which the liquid crystal display element is disposed, cracks due to stress strain in the soldered portion between the circuit board and the electrode lead can be achieved. Can be prevented.

Further, the circuit board is provided with a first positioning portion, and the case body is provided with a second positioning portion.
Since the electrode lead can be moved from the state in which it is in contact with the case body to the state in which it is separated by simply engaging the respective parts, the electrode lead is disposed in the insertion hole formed in the circuit board. It is possible to improve the workability in assembling after performing.

Further, the electrode lead is separated from the case body by forming the first and second locking portions on the case body and the circuit board and engaging the respective locking portions. The case body can be disposed and fixed on the circuit board while maintaining the state.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a forming state of electrode leads in the liquid crystal display element of the present invention.

FIG. 3 is a diagram showing a mounting state of the first embodiment.

FIG. 4 is a view showing a mounting state of the first embodiment.

FIG. 5 is a diagram showing a mounting state of a second embodiment of the present invention.

FIG. 6 is a view showing a mounting state of the second embodiment.

[Explanation of symbols]

1 Liquid crystal display element 2,2 'electrode lead 2a, 2a 'connection part 2b, 2d 'stress absorber 2c, 2c 'bend 2d, 2d 'inclined portion 2e, 2e 'guide section 3 case body 4 circuit board 6 Placement section 7,7 'Groove (partition) 8,8 'holder part 9 Boss (second positioning part) 10 Locking claw (first locking part) 11,11 'insertion hole 12,12 'Land section 13 Through hole (first positioning part) 14 Locking hole (second locking part)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-165049 (JP, A) JP-A-7-270760 (JP, A) JP-A-6-51336 (JP, A) JP-A-10- 282475 (JP, A) JP 2000-10500 (JP, A) JP 9-211486 (JP, A) Actual opening 4-65484 (JP, U) Actual opening Sho 59-33078 (JP, U) Patent 3097073 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02F 1/1333 G02F 1/1345

Claims (4)

(57) [Claims] 1. A liquid crystal display element, a case body having a mounting portion for disposing the liquid crystal display element, a liquid crystal display element arranged in a row, and the liquid crystal display elements being arranged in a row. The electrode lead arranged in contact with at least a part of the case body and an insertion hole for inserting the electrode lead, and electrically connected to the electrode lead, and A circuit board on which the case body is disposed, a first positioning portion provided on the circuit board, and a case body, which is provided on the case body, determines a position of the case body with respect to the circuit board, and performs the first positioning. A second positioning portion that engages with the guide portion, a guide portion that is formed at the tip portion of the electrode lead and that guides the electrode lead into the insertion hole, and a guide portion that is formed behind the guide portion and that includes the positioning portions. When engaged, A mounting structure for a liquid crystal display element, comprising: a bent portion that shifts the electrode lead from a state in which the electrode lead is in contact with the case body to a state in which the electrode lead is separated from the case body. 2. The mounting structure for a liquid crystal display element according to claim 1, wherein the case body is provided with a partitioning section for arranging the electrode leads so as to be spaced apart from each other. 3. The first positioning portion is a through hole penetrating the front and back of the circuit board, and the second positioning portion is a boss body extended from the case body, and the through hole and the The mounting structure for a liquid crystal display element according to claim 1, wherein the mounting structure is formed by engaging with a boss. 4. The first body is attached to the case body and the circuit board.
The mounting structure for a liquid crystal display element according to claim 1, wherein a second locking portion is formed and the locking portions are engaged with each other.