JPH09319311A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a break of a wiring film (TAB) due to a load caused by shock and vibration. SOLUTION: Even though a shock is applied in ±X or ±Z directions, the relative positions among a liquid crystal panel P and a driver board 7 do not change because the panel P and the board 7 are fixed to a panel fixing plate 21. Thus, the breakage of a TAB 5 is prevented. Moreover, the plate 21 is formed by the material having the thermal expansion coefficient which is approximately same as the coefficient of the panel P. Therefore, if the environmental temperature varies, the plate 21 and the panel P are expanded and contracted with a same ratio. Thus, the distance between the board 7 and the panel P does not change significantly and the occurrence of breakage of the TAB 5 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a display device known as a liquid crystal display, a plasma display, a field emission display, a digital micromirror device, etc., and more particularly, it has a function of improving impact resistance and the like. Display device.

[0002]

2. Description of the Related Art As one of display devices, there is a liquid crystal device which uses liquid crystal to display various kinds of information, and the liquid crystal device has been conventionally used in various fields.

Such a liquid crystal device is affected by the image quality being disturbed when a load such as shock or vibration is applied during use. Especially, in a liquid crystal device using a ferroelectric liquid crystal, There is a problem that the alignment state of the liquid crystal is disturbed by the load of 1, and the image quality is deteriorated. Therefore, various liquid crystal display devices having improved impact resistance have been proposed.

FIG. 1 is a diagram showing an example of the liquid crystal display device 1. As shown in FIG. 1A, the liquid crystal display device 1 is a liquid crystal panel for displaying various information by using liquid crystals. P
It has. The liquid crystal panel P has a pair of glass substrates 2 and 3 which are arranged substantially parallel to each other.
A transparent electrode (not shown) is formed on the surface of the. Liquid crystal (not shown) is sandwiched between the substrates. A polarizing film (not shown) is attached to the outer surface of the liquid crystal panel P, which also has a function as a polarizing plate.

Further, a flexible printed wiring film 5 is connected to the transparent electrodes described above. A driving IC 6 is mounted on the surface of the wiring film 5 (hereinafter referred to as “TAB5”), and the peripheral circuit board 7 of the driving IC 6 (hereinafter referred to as “driver board 7”) is mounted on the TAB 5. ) Is connected.

A panel fixing plate 9 for supporting the liquid crystal panel P is arranged below the liquid crystal panel P. The panel fixing plate 9 is a bottom wall portion 9a arranged along the panel P so as to face the liquid crystal panel P.
And a vertical wall portion 9b erected from the edge of the bottom wall portion 9a.

Further, between the bottom wall portion 9a and the liquid crystal panel P, an elastic member 10 is arranged in a frame shape so as to surround the display area of the liquid crystal panel P. The elastic member 10 and the bottom wall portion are arranged. 9a and the liquid crystal panel P form a substantially closed space A ₁ .

On the other hand, above the liquid crystal panel P, a transparent display plate 11 is arranged along the liquid crystal panel P,
A frame-shaped display plate support member 12 surrounding the display plate 11
Is arranged. The display plate 11 and the display plate support member 12 are adhered to each other, and the panel fixing plate 9
Is closed and a space for the liquid crystal panel P is formed between it and the panel fixing plate 9.

An elastic member 15 is arranged between the display plate 11 and the liquid crystal panel P so as to surround the display area of the liquid crystal panel P. The elastic member 15 and the display plate 11 are arranged.
The liquid crystal panel P and the liquid crystal panel P form a substantially closed space A ₂ .

In the liquid crystal display device 1 described above, the liquid crystal panel P is only supported by the elastic members 10 and 15 and can be moved in the ± X and ± Z directions to some extent.

On the other hand, the driver board 7 described above is
Only the movement in the Y direction is restricted, and the movement is supported in the ± X direction and the ± Z direction.

That is, the panel fixing plate 9 is formed with the ridges 16, and the driver board 7 is movably mounted on the ridges 16. On the other hand, the ridge portion 16
As shown in FIG. 1 (b), a holding metal fitting 17 is attached in the vicinity of, and the holding metal fitting 17 is extended to above the driver board 7 as shown in detail in FIG. 1 (c). The driver board 7 is restricted from moving in the ± Y directions.

The reason why the movement of the driver board 7 in the ± Y direction is restricted and the movement in the ± X direction and the ± Z direction is not restricted is as follows. (1) This is to prevent the TAB 5 and the like from being destroyed by temperature changes.

That is, the driver board 7 is fixed to the panel fixing plate 9 (not movably supported as in the above-mentioned conventional example), and the thermal expansion coefficient of the liquid crystal panel P and the thermal expansion of the panel fixing plate 9 are fixed. When the coefficient is different and the temperature is changed, the liquid crystal panel P and the driver board 7 are based on the difference in thermal expansion and contraction of the liquid crystal panel P and the panel fixing plate 9.
The relative distance between and will change. As a result, the TAB 5 itself may be broken, the TAB 5 may be peeled off from the liquid crystal panel P, or the TAB 5 may be peeled off from the driver board 7. It is movable.

Here, how the TAB 5 and the like are destroyed by the temperature rise will be specifically described with reference to FIGS. 2 and 3.

That is, FIG. 2A is a diagram showing the driver board 7 and the liquid crystal panel P which are in a proper positional relationship under a predetermined temperature environment, and the symbol d in the drawing indicates the liquid crystal panel P.
Shows the proper distance from the edge of to the center position of the driver board 7.

Now, assuming that the ambient temperature has risen and the coefficient of thermal expansion of the panel fixing plate 9 is larger than that of the liquid crystal panel P, the edge of the liquid crystal panel P is as shown in FIG. 2 (b). To the center position of the driver board 7, the TAB 5 and the like are destroyed. Reference numeral δ indicates an increase due to temperature rise, reference numeral δ _A indicates the expansion of the liquid crystal panel P, and δ _B indicates the expansion of the panel fixing plate 9.

On the contrary, when the coefficient of thermal expansion of the panel fixing plate 9 is smaller than that of the liquid crystal panel P, the distance from the edge of the liquid crystal panel P to the central position of the driver board 7 is as shown in the figure. As shown in 3 (a) and 3 (b), TAB5 and the like are destroyed as well. (2) This is to prevent the TAB 5 and the like from being destroyed by a load such as impact or vibration.

That is, since the liquid crystal panel P can move a little in the ± X and ± Z directions as described above, when a shock or vibration is applied in these directions, the liquid crystal panel P moves in that direction. Move to.

At this time, if the driver board 7 is fixed to the panel fixing plate 9 and its movement is restricted, the distance from the edge of the liquid crystal panel P to the center position of the driver board 7 is as shown in FIG. ) And (b), the TAB5 breaks, or the connection between the TAB5 and the driver board 7 or the connection between the TAB5 and the liquid crystal panel P is disconnected. It should be noted that FIG. 4B shows, as an example,
The case where the liquid crystal panel P moves so as to approach the driver board 7 is shown.

The reason why the driver board 7 is movably supported as described above is to avoid this.

[0022]

By the way, as described above, the liquid crystal panel P and the driver board 7 are arranged in the ± X direction and ±.
Although they can be moved in the Z direction, not fixing them has the possibility of destroying them due to shock and vibration, and there is a risk that the reliability of the entire device will decrease.

On the other hand, the above-mentioned liquid crystal display device 1 is required to prevent electromagnetic waves (interfering waves) from being emitted to the surroundings.
As a countermeasure, it is best in terms of price to form the panel fixing plate 9 with a conductor and fix the driver board 7 to the panel fixing plate 9. However, since the driver board 7 is configured to be movable with respect to the panel fixing plate 9 as described above, it is necessary to adopt another method instead of such an inexpensive method, and the liquid crystal display device is expensive accordingly. There was a problem that became. Hereinafter, this problem will be described.

That is, the electronic equipment such as the liquid crystal display device described above may deteriorate in performance or malfunction due to electromagnetic waves (electromagnetic signals or noise) emitted from other electronic equipment in the vicinity. On the contrary, the liquid crystal display device itself radiates an electromagnetic wave, which deteriorates the performance of other electronic devices in the vicinity or causes a malfunction to cause radiation interference (EM
It may cause I). In order to solve such problems, the immunity (interference emission capability (EMS)) that reduces the emission of electromagnetic waves to the surroundings and, on the contrary, does not cause malfunction even if electromagnetic waves are emitted from surrounding electronic devices
Must be provided in the electronic device itself.

In recent years, there has been an international movement to solve such radiation interference between electronic devices as an environmental problem to solve it and establish so-called electromagnetic compatibility (EMC). In Europe, according to the FCC standard and the EN standard, and also in Japan, according to the VCCI standard, it is obligatory to keep the level of the interference wave (radiation interference wave) radiated from an electronic device below a specified value.

By the way, the main cause of the above-mentioned electromagnetic wave (radiation interference wave) is that the ground voltage level of the device, which should be constant (0V), is not constant due to the influence of other circuits and vibrates. To do. In order to prevent such vibration of the ground voltage level, it is necessary to lower the impedance of the ground, and the liquid crystal display device 1 described above is used.
As a specific measure in, a conductor such as a metal may be provided near the driver board 7, the driver board 7 may be fixed to the conductor, and the conductor and the ground pattern of the driver board 7 may be electrically connected. in this case,
It is best in terms of price that the panel fixing plate 9 provided near the driver board 7 is made of metal and the driver board 7 is fixed to the panel fixing plate 9.

However, in the liquid crystal display device 1 of the above-mentioned conventional example, the driver board 7 is ± with respect to the panel fixing plate 9.
Since it is movable in the X and ± Z directions, the driver board 7 cannot be fixed to the panel fixing plate 9. Therefore, other methods such as driver board 7
It is necessary to reduce the impedance of the ground by using a multi-layer structure, shield all cables connecting the driver board 7 and the control board, and use a ferrite core. Therefore, the liquid crystal display device itself is expensive. There was a problem that became.

Therefore, it is an object of the present invention to provide a display device in which the display element or the like is prevented from being destroyed even when a load such as an impact is applied.

Another object of the present invention is to provide a display device in which the display element and the like are prevented from being destroyed even when the temperature changes.

A further object of the present invention is to provide a display device which is easy to manufacture.

Still another object of the present invention is to provide an inexpensive display device capable of suppressing radiation interference waves.

[0032]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and supports a display element, a peripheral circuit board connected to the display element, the display element and the peripheral circuit board. And a supporting unit for supporting the display element and the peripheral circuit board in a direction along the supporting unit. It is characterized in that it is provided with a regulation means for regulating each movement of the.

In this case, the regulating means includes a plurality of first positioning members fixed to the supporting means so as to abut on two adjacent edges of the display element, and the remaining two edges of the display element. It is preferable to include a plurality of second positioning members attached to the supporting means so as to abut. Further, it is preferable that the second positioning member is configured to be positionally adjustable.

On the other hand, at least a part of the supporting means may be formed of a conductor, and the pattern of the reference potential of the peripheral circuit board and the conductor may be electrically connected. In this case, the peripheral circuit board may be fixed to the supporting means by a fixing member, and the pattern of the reference potential of the peripheral circuit board and the conductor may be electrically connected by the fixing member.

On the other hand, a first elastic member is arranged between the display element and the supporting means so as to surround a display region of the display element, and the display element, the supporting means and the first means. The space defined by the elastic member may be a substantially closed space. Further, a plate-like member is provided along with the display element, and a second elastic member is arranged between the plate-like member and the display element so as to surround a display region of the display element, and The space defined by the display element, the supporting means, and the second elastic member may be a substantially closed space.

Further, the supporting means includes a transparent member arranged to face the display element, and a frame-shaped member arranged to surround the transparent member to support the transparent member.
The transparent member and the frame-shaped member may be made of a material having substantially the same coefficient of thermal expansion. In this case, the frame-shaped member may be made of steel, and the transparent member may be made of glass.

On the other hand, the display element may have a pair of substrates having electrodes formed on the surface thereof and facing each other, and a liquid crystal disposed between the pair of substrates. In this case, the liquid crystal is a ferroelectric liquid crystal,
You may do so.

Based on the above construction, the movement of the display element and the peripheral circuit board in the direction along the supporting means is restricted. Therefore, even when a load such as a shock is applied along the direction, the display element and the peripheral circuit board do not move, and their relative distance does not change.

Further, in the present invention, the supporting means is formed of a material having a thermal expansion coefficient substantially equal to that of the display element. Therefore, even if the environmental temperature of the display device changes, the relative distance between the display element and the peripheral circuit board does not change much.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same parts as those shown in FIG.

First, a first embodiment of the present invention will be described with reference to FIGS.

The liquid crystal display device (display device) 20 is shown in FIG.
A liquid crystal panel (display element) P is provided as shown in (a). The liquid crystal panel P has a pair of glass substrates 2 and 3 arranged substantially in parallel, and transparent electrodes (not shown) are formed on the surfaces of the substrates 2 and 3. A ferroelectric liquid crystal (not shown) is sandwiched between the substrates 2 and 3. A polarizing film (not shown) is attached to the outer surface of the liquid crystal panel P, which also has a function as a polarizing plate. Further, to the liquid crystal panel P, the TAB 5 and the driver board (peripheral circuit board) 7 are connected similarly to the above-described conventional example.

Also, one side of the liquid crystal panel P (+ Y in the figure)
A panel fixing plate (supporting means) 21 for supporting the liquid crystal panel P is arranged on the side of the direction. The panel fixing plate 21 has a transparent member 22 arranged at a position facing the liquid crystal panel P, and a frame-shaped member 23 is arranged so as to surround the transparent member 22.

Here, the transparent member 22 and the frame-shaped member 23 are adhered to each other. The frame-shaped member 23 is a material that is a conductor and has a coefficient of thermal expansion equal to that of the liquid crystal panel P (glass substrates 2 and 3) (for example, steel such as carbon steel. The coefficient of thermal expansion of carbon steel is 10. 7 × 10 ^-6 (1 / ° C ・
mm)). In addition, the transparent member 22 is
It is made of glass of the same material as the glass substrates 2 and 3 of the liquid crystal panel P. Therefore, in the present embodiment, the thermal expansion coefficient of the panel fixing plate 21 and the thermal expansion coefficient of the liquid crystal panel P are set to be substantially equal.

On the other hand, between the transparent member 22 and the liquid crystal panel P, an elastic member (first elastic member) 10 is arranged in a frame shape so as to surround the display area of the liquid crystal panel P. The member 10, the transparent member 22 and the liquid crystal panel P form a substantially closed space A ₁ .

As shown in detail in FIGS. 5 (b) and 6, the frame-like member 23 has a pin (first positioning member) 25.
Three a, 25b, and 25c are planted, and these pins 25a are in contact with the edge of the liquid crystal panel P.

Specifically, one pin 25a is shown in FIG.
As shown in (b), one edge P _L of the liquid crystal panel P (hereinafter,
For convenience of explanation, the left side P _L is abutted against the left side P _L and the opposite side edge P _R is a right side P _{R. The} other two pins 25b and 25c are adjacent to the left side P _L. Edge P _D (hereinafter, referred to as “lower side P _D ” for convenience of description, and edge P _U on the opposite side
Is referred to as “upper side P _U ”).

Further, the frame-shaped member 23 has four positioning members (second positioning members) 26, 26, 26, 26.
One is attached.

As shown in detail in FIG. 7A, the positioning member 26 has a long hole 26a, and a screw 27 penetrating the long hole 26a is used to fix the panel fixing plate 21 (frame member 2).
It is fixed to 3). Therefore, these positioning members 26 can be moved by loosening the screw 27 and fixed by tightening the screw 27. Then, as shown in FIG. 5A, the two positioning members 26 are in contact with the upper side P _U of the liquid crystal panel P,
The other two positioning members 26 are the right side P _{R of the} liquid crystal panel P.
Is in contact with

That is, in the present embodiment, the liquid crystal panel P is ± X by the pin 25a and the positioning member 26.
Movement in the direction and ± Z direction is restricted.

On the other hand, as shown in FIG. 5 (a), the frame-shaped member 23 is formed with a ridge 23a.
A driver board 7 is mounted on. A ground pattern 7a is formed on the driver board 7 (see FIG. 5B), and a through hole 29 penetrating the ground pattern 7a and the driver board 7 is formed in the portion where the ground pattern 7a is formed. (See FIG. 8 (a)). And this driver board 7
It is fixed to the protrusion 23a by a screw (fixing member) 30 penetrating the through hole 29. This allows the driver board 7 to move in the ± Y directions as well as ± X
The movement in the directions, and the movements in the ± Z directions are restricted.

The screws 30 are adapted to electrically connect the ground pattern 7a of the driver board 7 and the frame-shaped member 23.

On the other hand, above the liquid crystal panel P, a transparent display plate (plate-shaped member) 11 is provided alongside the liquid crystal panel P, and a frame-shaped display plate support member 12 is provided so as to surround the display plate 11. Are arranged. The display plate 11 and the display plate support member 12 are adhered to each other to close the panel fixing plate 9 and form a space for the liquid crystal panel P between the panel fixing plate 9 and the panel fixing plate 9.

An elastic member (second elastic member) 15 is arranged between the display plate 11 and the liquid crystal panel P so as to surround the display area of the liquid crystal panel P. The plate 11 and the liquid crystal panel P form a substantially closed space A ₂ .

FIG. 8 is a view showing a state in which the liquid crystal panel P and the driver board 7 are assembled to the panel fixing plate 21, but when the liquid crystal panel P and the like are assembled, each positioning member 26 is made movable. Every pin 25
The liquid crystal panel P is arranged with a as a positioning reference. Then, as shown in FIGS. 8 (a) and 7 (b), each positioning member 26 is moved so that the screw 30 is moved to a position where it comes into contact with the panel edge.
These members 26 are fixed by. This completes the positioning of the liquid crystal panel P. Next, the driver board 7 is fixed with screws 30 as shown in FIG.

Next, the operation of this embodiment will be described.

When a shock or the like in the + Y direction is applied to the liquid crystal display device 20 (see FIG. 5), the liquid crystal panel P
Moves in the same direction and compresses the space A ₁ and the elastic member 10. Since this space A ₁ is in a substantially sealed state, it pushes back the liquid crystal panel P as it is compressed, and exhibits a so-called air damper effect. Further, the elastic member 10 also tries to push back the liquid crystal panel P with the compression. Thereby, the movement and deformation of the liquid crystal panel P are suppressed, and the deterioration of the orientation and the image quality is prevented.

When a shock or the like is applied in the -Y direction, the movement and deformation of the liquid crystal panel P are suppressed by the upper space A ₂ and the elastic member 15, and similarly the deterioration of the orientation and the image quality is prevented. To be done.

On the other hand, when a shock or the like is applied in the ± X direction or the ± Z direction, the liquid crystal panel P or the driver board 7
Are fixed to the panel fixing plate 21, their relative distance (distance from the edge of the liquid crystal panel P to the central position of the driver board 7) does not change.

When the ambient temperature changes, the liquid crystal panel P and the panel fixing plate 21 expand and contract, but since their thermal expansion coefficients are almost the same, their relative distance (from the edge of the liquid crystal panel P to the driver). The distance to the center position of the board 7) hardly changes.

Next, effects of the present embodiment will be described.

According to this embodiment, the liquid crystal panel P and the driver board 7 are restricted from moving in the ± X and ± Z directions. Therefore, even when an impact is applied in that direction, the liquid crystal panel P and the driver board 7 do not move with respect to the panel fixing plate 21, and the relative distance between them does not change. Therefore, no load is applied to the TAB 5 itself, the connecting portion between the TAB 5 and the liquid crystal panel P, or the connecting portion between the TAB 5 and the driver board 7, and their destruction is prevented.

Further, as in the present embodiment, the liquid crystal panel P
By the pin 25a and the positioning member 26.
If the liquid crystal panel P is constrained in the Z direction, thermal stress may be generated in the liquid crystal panel P as the temperature rises, and the liquid crystal panel P itself may be damaged. However, in the present embodiment,
Since the panel fixing plate 21 is made of a material having a coefficient of thermal expansion substantially equal to that of the liquid crystal panel P, such a thermal stress does not occur and there is no fear of damage.

Further, since the panel fixing plate 21 is made of a material having a coefficient of thermal expansion substantially equal to that of the liquid crystal panel P, the liquid crystal panel P is changed even if the environmental temperature changes.
The distance from the edge of the to the central position of the driver board 7 hardly changes. Therefore, TAB5 itself or T
No load is applied to the connecting portion between the AB 5 and the liquid crystal panel P or the connecting portion between the TAB 5 and the driver board 7, and their destruction is prevented.

Here, the distance from the edge of the liquid crystal panel P to the central position of the driver board 7 is shown in FIG. 9 (a).
Consider along (b).

Now, when the temperature of the liquid crystal display device 20 rises, the liquid crystal panel P and the panel fixing plate 21 move in the ± X direction and ± Z direction.
Expands in the direction.

Here, the ± X direction of the liquid crystal panel P (and ±
Assuming that the length in the Z direction) is l _A and the length of the panel fixing plate 21 in the ± X directions (and ± Z directions) is l _B , the amount of deviation δ on one side relatively generated by thermal expansion of these.
Is

[0068]

(Equation 1) δ = (α _B 1 _B −α _A 1 _A ) ΔT / 2 α _A ; linear expansion coefficient of liquid crystal panel P α _B ; linear expansion coefficient of panel fixing plate 21 ΔT; temperature rise ( ℃).

Here, the linear expansion coefficient α _A of the liquid crystal panel P is almost equal to the linear expansion coefficient of the glass substrates 2 and 3, and is 8.5 × 10 ⁻⁶ (1 / ° C. · mm) in the present embodiment. The linear expansion coefficient α _B of the panel fixing plate 21 is 10.7.
Since ^{x10 -6} (1 / ° C · mm), l _A is 300
mm, l _B is 360 mm, and a temperature rise of ΔT = 40 ° C. occurs, the value of δ is as follows.

[0070]

(Equation 2) (Equation 2) δ = (10.7 × 10 ⁻⁶ × 360-8.5 × 10 ⁻⁶ × 300) × 40/2 = 2.6 × 10 ⁻² (mm) That is, The value is sufficiently small, and it can be easily understood that the above-described effects are obtained.

Although the present embodiment has various effects as described above, it also has the following effects.

That is, the outer dimensions of the liquid crystal panel P generally have manufacturing tolerances. However, in the present embodiment, the liquid crystal panel P is fixed in the ± X direction and the ± Z direction by the pin 25a and the positioning member 26,
Of these, the positioning member 26 is configured to be positionally adjustable. Therefore, the liquid crystal panel P can be accurately positioned regardless of the manufacturing tolerances described above.

The screw 30 for fixing the driver board 7 is in contact with the ground pattern 7a and the frame-shaped member 23, and the frame-shaped member 23 is made of a conductor. Therefore, the radiated emission is suppressed by a simple and inexpensive means.

Although the panel fixing plate 21 is composed of a plurality of members (the frame member 23 and the transparent member 22) in the above-described embodiment, the present invention is not limited to this and one member is of course necessary. You may make it comprise.
When the panel fixing plate 21 is formed of one member in this way, the transparency is required to be ensured in the transmissive liquid crystal device, and therefore the entire panel fixing plate needs to be formed of chemically strengthened glass or the like. . However, in the case of a reflective liquid crystal device, it is not necessary to secure the transparency, and the panel fixing plate is
Any non-transparent material may be used as long as it has a coefficient of thermal expansion equal to that of the liquid crystal panel.

Further, in the above-mentioned embodiment, the transparent member 22 is made of glass and the frame-shaped member 23 is made of steel. However, the invention is not limited to this, and the liquid crystal panel P can be used. Other materials may be used as long as they have the same coefficient of thermal expansion.

Further, in the above-mentioned embodiment,
Positioning of the liquid crystal panel P in the ± X direction and the ± Z direction is performed by a combination of a pin 25a that is fixed and cannot be adjusted in position and a positioning member 26 that can be adjusted in position. However, it is not limited to this. Alternatively, pins may be used for all or positioning members may be used for all.

Furthermore, in the above-described embodiment, the positions of the pin 25a and the positioning member 26 are shown in FIG. 5 (a), but a plurality of pins contact two adjacent edges of the liquid crystal panel P. If the plurality of positioning members are brought into contact with the remaining two end edges while being brought into contact with each other, the pin 25
The a and the positioning member 26 may be arranged at any position. That is, the pin 25a and the positioning member 26
By arranging in such a relationship, the liquid crystal panel P is always sandwiched by the pins and the positioning members in the ± X directions and its movement is restricted. Similarly, the liquid crystal panel P is always pinned or positioned in the ± Z directions. This is because the movement is restricted by being sandwiched by and the effect of the present invention can be achieved in any case.

In the above-described embodiment, the lower side P _D , the upper side P _{U and the} right side P _R of the liquid crystal panel P are
Two pins or positioning members are respectively brought into contact with each other, and only one pin 25a is brought into contact with the left side P _L of the liquid crystal panel P, but the number thereof is not particularly limited.

Further, the structure of the positioning member 26 is not limited to that shown in FIG. 6, and other structures may be used as long as the moving state and the non-moving state (fixed state) can be selectively obtained.

Furthermore, in the above-mentioned embodiments, the liquid crystal panel using the ferroelectric liquid crystal has been described, but it is not limited to this, and the liquid crystal panel using another liquid crystal material (nematic liquid crystal or the like). The present invention may be applied to.

[0081]

As described above, according to the present invention,
The display element and the peripheral circuit board are supported by the supporting means so that their relative movement is restricted. Therefore, even when an impact is applied, the display element and the peripheral circuit board do not move relative to the supporting means, and the relative distance between them does not change. As a result, no load is applied to the connection portion between the display element and the peripheral circuit board, and the destruction thereof is prevented.

Such an effect can be effectively achieved by providing a plurality of positioning members that are in contact with the edge of the display element to position the edge.

According to the present invention, the supporting means is
It is made of a material having a coefficient of thermal expansion substantially equal to that of the display element. Therefore, when these temperatures change, they expand and contract with approximately equal behaviour. as a result,
It is possible to prevent stress from occurring due to temperature change between the display element and the supporting means, and to prevent various problems caused by the stress from occurring.

Similarly, when the temperature changes, the display element and the supporting means expand and contract, and the position of the peripheral circuit board supported by the supporting means also changes. However, in the case of the present invention, since the thermal expansion coefficient of the supporting means and the thermal expansion coefficient of the display element are substantially equal to each other, the relative distance between the peripheral circuit board and the display element does not change much. As a result, as in the case of receiving the impact described above,
No load is applied to the connection portion between the display element and the peripheral circuit board, and the destruction thereof is prevented.

Further, in the case where the second positioning member that abuts on two adjacent edges of the display element among the positioning members abutted on the edge of the display element is positionally adjustable, By adjusting the position of the second positioning member after assembling the element, the display element can be surely positioned even if there is some dimensional error in the display element. In this case, when the first positioning member that abuts the remaining two end edges is fixed to the supporting means, the mounting position when assembling the display element becomes accurate, and the assembling workability is improved. It

Furthermore, when at least a part of the supporting means is formed of a conductor and the pattern of the reference potential of the peripheral circuit board and the conductor are electrically connected,
It can suppress radiated interference waves.

Further, a first elastic member is arranged between the display element and the supporting means so as to surround the display area of the display element, and the display element, the supporting means and the first means. When a substantially closed space is formed by the elastic member, deformation and movement of the display element can be suppressed by the air damper effect of the space, and deterioration of orientation of the display element and deterioration of image quality can be prevented. .

Further, a plate-like member is provided along with the display element, and a second elastic member is arranged between the plate-like member and the display element so as to surround the display area of the display element,
Further, when the display element, the supporting means, and the second elastic member form a substantially closed space, the air damper effect of the space can suppress the deformation and movement of the display element. It is possible to prevent the deterioration of the orientation of the display element and the deterioration of the image quality.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a conventional liquid crystal display device,
(a) is a sectional view thereof, (b) is a plan view showing a mounting state of a driver board and the like, and (c) is a sectional view taken along line CC of (b).

FIG. 2 is a diagram for explaining a reason for movably supporting a driver board, FIG. 2 (a) is a diagram showing a driver board and a liquid crystal panel in an appropriate positional relationship under a predetermined temperature environment, and FIG. ) Is a cross-sectional view showing a state in which those connecting portions are broken due to temperature rise.

FIG. 3 is a diagram for explaining the reason why the driver board is movably supported, and (a) is a diagram showing the driver board and the liquid crystal panel in an appropriate positional relationship under a predetermined temperature environment, (b) ) Is a cross-sectional view showing a state in which those connecting portions are broken due to temperature rise.

4A and 4B are views for explaining the reason why the driver board is movably supported, where FIG. 4A is a view showing the driver board and the liquid crystal panel in an appropriate positional relationship, and FIG. 4B is a load such as impact. FIG. 6 is a cross-sectional view showing a state in which the liquid crystal panel has moved and the connecting portions thereof have been broken.

FIG. 5 is a diagram showing a form of an embodiment of the present invention,
(a) is a cross-sectional view of the liquid crystal display device, and (b) is a plan view thereof.

FIG. 6 is a view for explaining the detailed structure of the pin and the like.

FIG. 7 is a view for explaining the detailed structure of the positioning member.

FIG. 8 is a diagram showing a state in which a liquid crystal panel or the like is assembled to the panel fixing plate, and FIG. 8A is a diagram showing a state in which the positioning member is moved after the liquid crystal panel is placed on the panel fixing plate; (b) is a figure for explaining a state when fixing a driver board.

FIG. 9 is a diagram for explaining the effect of the present invention.

[Explanation of symbols]

2 and 3 glass substrate (substrate) 7 driver board (peripheral circuit substrate) 7a ground pattern (reference potential pattern of peripheral circuit substrate) 10 elastic member (first elastic member) 11 display plate (plate member) 15 elastic member (Second elastic member) 20 Liquid crystal display device (display device) 21 Panel fixing plate (supporting means) 22 Transparent member 23 Frame-shaped members 25a, 25b, 25c Pins (first positioning member) 26 Positioning member (second Positioning member) 30 Screw (fixing member) A ₁ Almost enclosed space A ₂ Almost enclosed space P Liquid crystal panel (display element)

Claims (11)

[Claims] 1. A display device comprising: a display element; a peripheral circuit board connected to the display element; and a supporting means for supporting the display element and the peripheral circuit board, wherein the supporting means comprises the display. A display device, which is formed of a material having a thermal expansion coefficient substantially equal to that of the element, and is provided with a restriction means for restricting movement of the display element and the peripheral circuit board in a direction along the supporting means. . 2. The regulating means includes a plurality of first positioning members fixed to the supporting means so as to contact two adjacent edges of the display element, and the remaining two edges of the display element. The display device according to claim 1, further comprising a plurality of second positioning members attached to the supporting means so as to abut. 3. The display device according to claim 2, wherein the second positioning member is configured to be positionally adjustable. 4. The at least part of the supporting means is made of a conductor, and the pattern of the reference potential of the peripheral circuit board and the conductor are electrically connected to each other. The display device according to claim 1. 5. The peripheral circuit board is fixed to the supporting means by a fixing member, and the pattern of the reference potential of the peripheral circuit board and the conductor are electrically connected by the fixing member. The display device according to claim 4. 6. Between the display element and the supporting means,
A first elastic member is arranged so as to surround a display area of the display element, and a space defined by the display element, the supporting means, and the first elastic member is a substantially closed space. The display device according to claim 1, wherein the display device is a display device. 7. A plate-shaped member is provided along with the display element, and a second elastic member is arranged between the plate-shaped member and the display element so as to surround a display region of the display element, The display device according to any one of claims 1 to 6, wherein the space defined by the display element, the support means, and the second elastic member is a substantially closed space. 8. The supporting means includes a transparent member arranged to face the display element, and a frame-shaped member arranged so as to surround the transparent member to support the transparent member. The display device according to any one of claims 1 to 7, wherein the transparent member and the frame-shaped member are formed of a material having substantially the same coefficient of thermal expansion. 9. The display device according to claim 8, wherein the frame-shaped member is made of steel, and the transparent member is made of glass. 10. The display element has a pair of substrates which have electrodes formed on the surface and are arranged to face each other, and a liquid crystal which is arranged between the pair of substrates. Item 10. The display device according to any one of items 1 to 9. 11. The display device according to claim 10, wherein the liquid crystal is a ferroelectric liquid crystal.