JPH0876098A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide a liquid crystal display device constituted so that stress exerted on connection terminal can be surely reduced with excellent workability without increasing the number of working processes. CONSTITUTION: The liquid crystal display device is provided with an LCD holder 30 supporting a liquid crystal panel 10 between a printed substrate 20 having wiring for supplying a prescribed control signal to the panel 10 and the panel 10. The substrate 20 and the panel 10 are connected by the connection terminal 14. Besides, the holder 30 is provided with a deformation compensation space for compensating the difference of deformation quantity between the holder 30 and the terminal 14 generated when the thermal expansion coefficient thereof are different. Thus, the difference of the deformation quantity between the holder 30 and the terminal 14 can be absorbed without adding a special member or the special working process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid crystal display device, and more particularly to a structure of a holder for supporting a liquid crystal panel.

[0002]

2. Description of the Related Art FIG. 8 shows a structure of a conventional liquid crystal display device in which a liquid crystal panel 10 is installed in a housing 18.

The liquid crystal panel 10 is filled with liquid crystal between
It is composed of a pair of insulating substrates bonded at a predetermined interval. Then, an electrode for driving the liquid crystal is formed on the liquid crystal side surface of each insulating substrate, and a plurality of LCs drawn from the electrodes are formed at the end of the lower insulating substrate.
The D terminal is formed.

The printed circuit board 20 is provided with wiring for supplying a predetermined control signal to the liquid crystal panel 10.
An LCD holder 50 integrally formed by resin molding or the like is fixed to the printed circuit board 20,
The liquid crystal panel 10 is arranged on the LCD holder 50 and supports the liquid crystal panel 10.

When the liquid crystal panel 10 is a transmissive type or a semi-transmissive type, an LCD backlight is attached to the printed circuit board 20 which is the back side of the liquid crystal panel 10, and this LC is used.
The LCD holder 50 is arranged so as to surround the D backlight. The LCD holder 50 functions as a spacer between the liquid crystal panel and the printed board 20, and at the same time functions as a light blocking member that prevents the light of the LCD backlight from leaking to the outside.

The conductive connecting terminal 14 is connected to each LC
One end side is attached to the D terminal, and the other end side is the solder 1
It is fixed to the printed circuit board 20 by 6. Then, the connection terminal 14 electrically connects a predetermined wiring of the printed circuit board 20 and the LCD terminal, and a liquid crystal control signal or the like supplied to the predetermined wiring of the printed circuit board 20 is connected through the connection terminal 14. Supplied to the liquid crystal panel 10,
The liquid crystal is being driven.

[0007]

However, such a liquid crystal display device may be used in a state where the environmental temperature changes greatly. For example, in a vehicle-mounted liquid crystal display device or the like, about 80 degrees or more. May be exposed to high temperature atmosphere. In such a high temperature atmosphere, deformation due to thermal expansion of each member of the liquid crystal display device cannot be ignored. Particularly, when the connection terminals 14 that electrically connect the printed circuit board 20 and the liquid crystal panel 10 and the LCD holder 50 that supports the liquid crystal panel 10 have different coefficients of thermal expansion, the connection terminals 14 in the high temperature atmosphere and the LCD holder 50. A difference occurs in the amount of deformation between and. Then, there is a problem that stress is applied to the end portion of the connection terminal 14 due to the difference in the deformation amount.

That is, the connection terminal 14 is made of metal, while the LCD holder 50 is made of resin or the like. Therefore, the LCD holder 50 generally has a higher coefficient of thermal expansion than the connection terminal 14, and when exposed to a high temperature atmosphere, a force for pushing up the liquid crystal panel 10 is generated in the LCD holder 50. As a result, when the connection terminal 14 is fixed to the printed circuit board 20, particularly large stress is applied to the fixing portion between the connection terminal 14 and the printed circuit board 20. Therefore, there is a problem that cracks or the like are generated in the solder 16 of the fixing portion, which causes a contact failure or the like.

In order to solve this, for example, a structure as shown in FIG. 9 has been proposed.

In FIG. 9, the connection terminal 14 is provided with a bent portion in advance, and the printed circuit board 20 and the liquid crystal panel 10 are connected using the connection terminal 14. Therefore, when the liquid crystal display device is exposed to a high temperature atmosphere and the LCD holder 50 is largely deformed, the bent portion of the connection terminal 14 absorbs the deformation of the LCD holder 50 and reduces the stress applied to the end portion of the connection terminal 14. To do.

However, if the connection terminal 14 is provided with a bent portion, the positional accuracy of the tip of the terminal is deteriorated when the connection terminal 14 is attached to the liquid crystal panel 10 and the printed circuit board 20. Therefore, there is a problem that workability at the time of attaching the connection terminal 14 is reduced. In addition, the process of deforming the connection terminal 14 to provide the bent portion is increased, and a separate mold for forming the bent portion is required, resulting in an increase in manufacturing cost. Further, there is a problem that the liquid crystal display device needs an extra space for the bent portion.

As another method for reducing the stress applied to the connection terminal 14, a structure as shown in FIG. 10 has been proposed.

This is the LCD holder 50 and the liquid crystal panel 1.
A soft material 52 such as a sponge is provided between the soft material 52 and
By this, the deformation of the LCD holder 50 is absorbed and the stress applied to the connection terminal 14 is reduced.

However, according to this method, the number of members and the work steps are increased. Further, it is difficult to position the liquid crystal panel 10 placed on the LCD holder 50, and there is a problem that workability in attaching the connection terminal 14 to the liquid crystal panel 10 is deteriorated. Further, since the soft material 52 such as a sponge is not highly resistant, dust is likely to be generated due to a defect or the like, and there is a possibility that a short circuit due to dust may be generated at the terminal portion. Further, there is a possibility that the liquid crystal panel 10 may be tilted due to the occurrence of a partial defect or the like.

As described above, the conventional method of reducing the stress on the connection terminal by the structure of the liquid crystal display device has problems in workability, space, and further reliability of the liquid crystal display device.

The present invention has been made in order to solve these problems, and it is an object of the present invention to provide a liquid crystal display device capable of reliably and efficiently reducing the stress applied to a connection terminal without increasing the number of working steps. To aim.

[0017]

In order to achieve the above object, the liquid crystal display device according to the present invention has the following features.

A liquid crystal enclosed between a pair of insulating substrates is driven by electrodes provided on the liquid crystal side of the insulating substrate to perform a predetermined display, and a predetermined control for the electrodes of the liquid crystal panel. A printed circuit board having wiring for supplying signals, an integrated holder having one end fixed to the printed circuit board and the liquid crystal panel arranged at the other end to support the liquid crystal panel, and one printed circuit board at one end side. A connection terminal that is connected to a substrate and has the other end electrically connected to the electrode of the liquid crystal panel and that supplies a predetermined control signal to the electrode, the holder and the connection terminal being provided in the holder. Is provided with a deformation compensation space for compensating for the difference in the coefficient of thermal expansion between and.

The deformation compensation space of the holder is formed by providing a cut portion in the holder.

The deformation compensation space of the holder is characterized by being formed by a spring portion or a protrusion portion formed on the contact surface side with the liquid crystal panel, or a combination thereof.

The deformation compensation space of the holder is formed by a combination of any one of the cut portion, the spring portion, and the protrusion portion.

[0022]

The liquid crystal display device according to the present invention has a holder provided between the printed circuit board and the liquid crystal panel to support the liquid crystal panel, and a connection terminal for connecting the printed circuit board and the liquid crystal panel. To compensate for the difference in the amount of deformation between the holder and the connection terminal when the coefficients of thermal expansion differ,
The holder is provided with a deformation compensation space.

Due to the existence of the deformation compensating space integrally formed at the time of molding the holder, it is possible to absorb the difference in the amount of deformation between the holder and the connection terminal without adding a special member or a special work process. Becomes Therefore, even if the thermal expansion coefficient of the connection terminal is different from that of the holder, stress is intensively applied to the end portion of the connection terminal to cause connection failure between the connection terminal and the printed circuit board, or between the connection terminal and the liquid crystal panel. It is possible to prevent the occurrence of misalignment.

Further, in the present invention, the deformation compensation space of the holder is constituted by the notch, the spring or the protrusion, or a combination thereof.

When the coefficient of thermal expansion of the holder is larger than that of the connection terminal, if the deformation compensation space of the holder is constituted by the cut portion, the expansion amount of the holder in the high temperature atmosphere can be absorbed by the narrow cut portion. . Further, even when the spring portion is used, there is a deformation compensation space in which the spring portion can be deformed, so that the expansion portion of the holder can be absorbed by the deformation of the spring portion. Further, when the protrusion is provided, the protrusion forms a deformation compensation space between the holder and the liquid crystal panel. When this space is narrower than the expansion of the holder, the expansion of the holder can be absorbed.

On the other hand, when the coefficient of thermal expansion of the holder is smaller than that of the connection terminal, expansion of the connection terminal in a high temperature atmosphere causes a force to push down the liquid crystal panel. Also in this case, the deformation compensation space is easily deformed,
That power can be dispersed.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings described below, the same parts as those in the drawings already described are designated by the same reference numerals and the description thereof will be omitted.

(Embodiment 1) As shown in FIGS. 1 and 2, the feature of this embodiment is that an LC is formed by integrally molding a resin or the like.
The D holder 30 is provided with a deformation compensation space.

In the figure, the LCD holder 30 has one end fixed to the printed circuit board 20 and the other end fixed to the liquid crystal panel 1.
0 is arranged to support the liquid crystal panel 10. The LCD holder 30 has a notch 32a which is formed in a direction substantially parallel to the liquid crystal panel 10 to be arranged and has a predetermined width and length which reaches the vicinity of the center of the LCD holder 30.
Are formed. The space formed by the cutout 32a constitutes a deformation compensation space. Further, due to the notch 32a, the spring portion 32 is formed on the contact surface side of the LCD holder 30 with the liquid crystal panel 10, so that the deformation of the LCD holder 30 becomes easier.

Further, the liquid crystal panel 10 of the LCD holder 30.
A dent (cutout portion) 32b is formed on the contact surface side with the dent 32b, and this dent 32b constitutes another deformation compensation space different from the cutout portion 32a. And the depression 3
By providing 2b, the contact area between the liquid crystal panel 10 and the LCD holder 30 is reduced, and the spring portion 32 is easily deformed.

As described above, the connection terminals 14 for electrically connecting the printed circuit board 20 and the liquid crystal panel 10 are
It is usually formed of a conductive member such as metal. On the other hand, the LCD holder 50 that supports the liquid crystal panel 10 is formed by integrally molding resin or the like. Therefore, the thermal expansion coefficients of the connection terminal 14 and the LCD holder 30 do not match, and in general, the LCD holder 30 has a higher thermal expansion coefficient.
The coefficient of thermal expansion is higher than 4. That is, when the liquid crystal display device according to the present embodiment is used in a vehicle or the like and is exposed to a high temperature atmosphere, the LCD holder 30 is deformed more.
A force is generated in the direction of pushing up 0.

In the present embodiment, as described above, the LCD holder 30 is provided with the notch 32a, the recess 32b, and the spring portion 3.
2 is provided to form the deformation compensation space. Therefore, even if the LCD holder 30 is exposed to a high temperature atmosphere and the LCD holder 30 expands as shown in FIG. 3, the expansion portion can be absorbed by narrowing the notch 32a and the recess 32b. Also,
Since the spring portion 32 is easily deformed, the spring portion 3
The deformation of LCD holder 30 can absorb the expansion of LCD holder 30.

On the other hand, from the connection terminal 14 to the LCD holder 30
When the coefficient of thermal expansion is smaller, the force is generated in the direction of pushing down the liquid crystal panel 10 due to the expansion of the connection terminal 14 in the high temperature atmosphere. Also in this case, the deformation compensation space is easily deformed, and the force generated by the narrowing of the space can be dispersed.

Therefore, stress is intensively applied to the end portions of the connection terminals, cracks occur in the solder or the like at the connection portions of the terminals, and connection failure may occur between the connection terminals and the printed circuit board or liquid crystal panel. Therefore, it is possible to prevent the displacement.

Further, since the LCD holder is formed by integrally molding a resin or the like, the cut portion, the recess, the spring portion and the like can be formed at the same time when the LCD holder is molded. Therefore, even if these deformation compensation spaces are provided,
The work process and the number of parts do not increase. Further, since the connection terminal does not need to be processed and does not have a special shape (for example, a bent portion), the work of attaching the connection terminal to the printed circuit board and the liquid crystal panel is easy, and its workability is high. .

The deformation compensation space of the LCD holder 30 may be constituted by any one of the cutout 32a, the recess (cutout) 32b, and the spring 32.

(Second Embodiment) Next, the structure of the LCD holder 30 having a deformation compensation space different from that of the first embodiment will be described.

The LCD holder 30 shown in FIG. 4 is provided with a spring portion 34 having a protrusion protruding in an arc shape on the contact surface side with the liquid crystal panel 10. As shown in FIG. 4A, the spring portion 34 is configured such that one end side of the arcuate protrusion is fixed to each side surface (for example, four side surfaces) outside the LCD holder 30. Then, the protruding portion protruding toward the contact surface side with the liquid crystal panel 10 contacts the liquid crystal panel 10 and supports the liquid crystal panel 10. As a result, a space is formed between the LCD holder 30 and the liquid crystal panel 10,
This space constitutes the deformation compensation space. Therefore, the difference in the deformation amount between the connection terminal and the LCD holder 30 can be reliably compensated. Further, since the spring portion 34 is deformable, it is possible to easily absorb the force generated by the deformation of the spring portion 34 due to the difference in the deformation amount.

Further, since the LCD holder is formed by integral molding, a special work process is added when forming the LCD holder even when the spring compensation portion and the projection portion are formed in the LCD holder to form the deformation compensation space. The number of parts does not increase.

Furthermore, since the connecting terminal is not provided with a bent portion or the like and is linear, the positional accuracy of the tip of the connecting terminal does not deteriorate when the connecting terminal is attached to the printed circuit board and the liquid crystal panel. Therefore, the workability of assembling the liquid crystal display device does not decrease due to the provision of the deformation compensation space in the LCD holder, and the workability is maintained high.

The spring portion 34 has the same effect even if the protrusion 38 as shown in FIG. 5 is provided on the contact surface side with the liquid crystal panel 10.

(Embodiment 3) Next, Embodiment 1 and Embodiment 2
The configuration of the LCD holder having a deformation compensation space different from the above will be described.

In the LCD holder 30 shown in FIGS. 6 and 7, a columnar protrusion 40 or a polygonal pyramidal protrusion 42 is provided on the side of the LCD holder 30 that contacts the liquid crystal panel. A deformation compensation space is formed by the protrusions 40 and 42.

That is, by the protrusions 40 and 42, L
A predetermined space is formed between the CD holder and the liquid crystal panel, and this space serves as a deformation compensation space. When the connection terminal and the LCD holder have different coefficients of thermal expansion, the deformation compensation space is narrower than the expansion of the LCD holder or the connection terminal, so that the expansion of the LCD holder or the expansion of the connection terminal can be absorbed. Further, if the protrusions 40 and 42 are sufficiently small, the periphery of the protrusions 40 and 42 can be easily deformed.
The expansion of the D holder or the connection terminal can be absorbed.

Further, since the LCD holder is formed by integral molding of resin or the like as in the other embodiments,
Even if the LCD holder is provided with such a protrusion, a special work process or the number of parts does not increase.
In addition, assembling the liquid crystal display device is easy.

The projections 40 and 42 may be provided in a number enough to reliably support the liquid crystal panel, and the shape thereof is not limited to a cylinder or a polygonal pyramid.

[0047]

As described above, in the liquid crystal display device according to the present invention, the holder provided between the printed circuit board and the liquid crystal panel for supporting the liquid crystal panel is connected to the printed circuit board and the liquid crystal display. The holder is provided with a deformation compensation space in order to compensate for the difference in the amount of deformation between the holder and the connecting terminal that occur when the thermal expansion coefficients of the holder and the connecting terminal differ.

The deformation compensation space integrally formed during the molding of the holder makes it possible to absorb the difference in the amount of deformation between the holder and the connection terminal without adding a special member or a special working process. . Therefore, even if the thermal expansion coefficient of the connection terminal is different from that of the holder, stress is intensively applied to the end portion of the connection terminal to cause connection failure between the connection terminal and the printed circuit board, or between the connection terminal and the liquid crystal panel. It is possible to prevent the occurrence of misalignment.

Further, in the present invention, the deformation compensating space of the holder is constituted by the notch, the spring or the protrusion, or a combination thereof.

When the deformation compensation space of the holder is constituted by the cut portion when the thermal expansion coefficients of the connection terminal and the holder are different, the expansion portion of the holder or the connection terminal in a high temperature atmosphere is absorbed by the narrow cut portion. can do. Also, when the spring portion is used, there is a deformation compensation space in which the spring portion can be deformed, and the deformation of the spring portion can absorb the expansion of the holder or the connection terminal. When the protrusion is provided, the protrusion forms a deformation compensating space between the holder and the liquid crystal panel, and this space is narrower than the expansion of the holder or the connection terminal to absorb the expansion of the holder. You can

[Brief description of drawings]

FIG. 1 is a side view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an LCD holder 30 shown in FIG.

FIG. 3 is a diagram showing a state in which the liquid crystal display device of FIG. 1 is exposed to a high temperature atmosphere.

FIG. 4 is a diagram showing a configuration of a liquid crystal display device and an LCD holder thereof according to a second embodiment of the present invention.

5 is an L according to the second embodiment having a configuration different from that in FIG.
It is a figure which shows a CD holder.

FIG. 6 is a diagram showing a configuration of an LCD holder according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of an LCD holder according to a third embodiment different from that of FIG.

FIG. 8 is a diagram showing a configuration of a conventional liquid crystal display device.

FIG. 9 is a diagram showing a conventional liquid crystal display device having a configuration for reducing stress related to a connection terminal.

FIG. 10 is a view for reducing the stress related to the connection terminal.
FIG. 10 is a diagram showing a conventional liquid crystal display device having a configuration different from that of FIG.

[Explanation of symbols]

 10 Liquid Crystal Panel 14 Connection Terminal 16 Solder 18 Housing 20 Printed Circuit Board 30 LCD Holder 32, 34 Spring Part 32a Notch Part 32b Recess 36, 38, 40, 42 Projection Part

Claims (4)

[Claims] 1. A liquid crystal sealed between a pair of insulating substrates,
A liquid crystal panel driven by electrodes respectively provided on the liquid crystal side of the insulating substrate to perform a predetermined display, a printed circuit board having wiring for supplying a predetermined control signal to the electrodes of the liquid crystal panel, and one end side An integral holder that is fixed to the printed circuit board and has the liquid crystal panel arranged at the other end side to support the liquid crystal panel; one end side is connected to the printed circuit board; the other end side is the electrode of the liquid crystal panel. A deformation compensation space for compensating for a difference in coefficient of thermal expansion between the holder and the connection terminal, the connection terminal being electrically connected and supplying a predetermined control signal to the electrode. A liquid crystal display device comprising: 2. The liquid crystal display device according to claim 1, wherein the deformation compensation space of the holder is formed by providing a cut portion in the holder. 3. The liquid crystal display device according to claim 1, wherein the deformation compensation space of the holder is formed by a spring portion or a protrusion portion formed on the contact surface side with the liquid crystal panel, or a combination thereof. A liquid crystal display device characterized in that 4. The liquid crystal display device according to claim 2, wherein the deformation compensation space of the holder is formed by a combination of the cut portion, the spring portion or the protrusion portion. A liquid crystal display device characterized by being provided.