JPH09197383A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which obviates the occurrence of a backlash between the housing part and cap part of a shielding case for housing a liquid crystal cell and has a high accuracy in a alingning and positioning. SOLUTION: The shielding case cap part 13 is fitted to the shielding case housing part 2 in which the liquid crystal cell 11 is housed and fixed. The projections 12B for stopping coming off and projections 12C for positioning formed on the side walls 12A, 13A of both and engaging holes 18 for positioning are engaged with each other. Positioning is executed by fitting both ends in the transverse direction of the projections 12C for positioning into both ends in the transverse direction of the engaging holes 18 for positioning so as to bring these ends into tight contact with both ends in the transverse direction of the engaging holes 18. The need for tightly fitting the housing part and cap part of the shielding case is, therefore, eliminated and the assembly and disassembly are made easy. The backlash is prevented by the positioning function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a shield case for accommodating a liquid crystal cell.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10A, a liquid crystal display device 3 in which a liquid crystal cell 1 is housed in a shield case 2 is known. As shown in the figure, the shield case 2 has a window opening 4 for exposing the display area 1A of the liquid crystal cell 1. In the case of a transmissive liquid crystal display device, a window opening is also formed on the back surface side of the shield case 2. Further, FIG. 10B shows the liquid crystal display device 3.
The side of is shown. The shield case 2 is shown in FIG.
As shown in (A) and (B), it comprises a shield case housing portion 5 and a shield case lid portion 6. Then, the engaging projection 5A is provided on the side wall of the shield case storage portion 5.
Is formed so as to project outward, and an opening 6A for engagement is formed in the side wall of the shield case lid 6. FIG.
As shown by a broken line in (A), engaging portions 7 are provided at, for example, 12 positions around the shield case 2. The shield case storage part 5 and the shield case cover part 6 are fitted to each other, and the engagement projection 5A is put into the engagement opening part 6A to be engaged with each other, whereby the shield case storage part 5 and the shield case cover part 6 are separated from each other. A liquid crystal display device 3 in a state where the liquid crystal cell 1 is housed by fitting is configured. Engagement part 7
Is a portion where the engagement projection 5A and the engagement opening 6A are engaged with each other. FIG. 11 shows a cross-sectional view including the engaging portion 7 of the reflective liquid crystal display device. When the liquid crystal display device is a transmissive type, it has a configuration including a backlight system and the like.

The shield case 2 is housed in an exterior case (not shown).
Groove-shaped positioning recesses 2A are formed in the four corners of the shield case 2 along the thickness direction of the case, and the four corners inside the outer case are used for positioning the shield case 2. Positioning projections (not shown) are formed on the recesses 2A so that the shield case 2 and the outer case can be relatively positioned by the positioning recesses 2A and the positioning projections. Has become.

[0004]

However, in the above-mentioned conventional liquid crystal display device, as shown in FIG. 13A, the width dimension a of the shield case housing portion 5 is the inner width dimension of the shield case lid portion 6. If it becomes shorter than b,
The backlash is generated by the amount of the clearance, and when the liquid crystal display device is dropped, for example, the engaging projection 5A is disengaged from the engaging opening 6A, and the shield case housing part 5 and the shield case lid part 6 are not fitted properly. There is a problem that occurs. Further, since the shield case housing 5 may move relative to the shield case lid 6 by this clearance, the window opening portion formed in the display area 1A of the liquid crystal cell 1 and the shield case lid 6. There was a problem that the relative position with respect to 4 was displaced. In particular, as shown in FIG. 13A, when the polarizing plate 8 is provided on the surface of the surface region 1A of the liquid crystal cell 1, due to the rattling described above, the opening edge of the window opening 4 and the polarizing plate There is a problem that the polarizing plate 8 is damaged due to the contact with the periphery of the polarizing plate 8. Liquid crystal display device 3
Since it is important to minimize the clearance between the display area 1A and the window opening portion 4 in (1) as an element for improving the performance of the product, it is desirable to reduce this clearance as much as possible. Note that reference numeral 9 in FIG. 13A indicates a frame for holding the liquid crystal cell 1 and fixing it to the shield case housing portion 5.

On the contrary, as shown in FIG.
If the width dimension a of the shield case housing portion 5 is too longer than the inner width dimension b of the shield case lid portion 6, the liquid crystal display device 3
There is a problem that the outer shape is deformed and warps and bends occur, which exceeds the allowable value of the outermost dimension and causes a malfunction. From this point of view, it is ideal that the width dimension a of the shield case housing portion 5 and the inner width dimension b of the shield case lid portion 6 are substantially equal to each other. To achieve this, a certain degree of tolerance is required, and as a result, the lengths of the width dimension a and the width dimension b are different. For this reason, in order to securely fit the shield case housing portion 5 and the shield case lid portion 6 to each other, it is necessary to set a predetermined fitting clearance, knowing that rattling occurs. For this reason,
As described above, the shield case lid 6 is larger than the window opening 4 and the liquid crystal display device 3 is large. In FIG. 13B, the liquid crystal cell 1, the frame 9 and the like are omitted.

Further, when such a liquid crystal display device 3 is housed in an outer case, the positioning recess 2A formed at the corner of the shield case 2 is positioned inside the positioning projection of the outer case. Since it has to be set, it is inevitable that rattling will occur here as well. In particular, since it is not possible to set a large radial dimension of the positioning convex portion, some rattling may occur even if the diagonal dimension accuracy of the outer case is improved. Further, since the positioning recess 2A of the shield case 2 is formed of sheet metal, when the shield case 2 is attached to or detached from the outer case, scratches occur inside the outer case, causing rattling or scraping. There were problems such as the generation of dust. One of the problems of the present invention is what kind of means should be taken to obtain a liquid crystal display device in which rattling does not occur between the housing side and the lid side of the shield case and accurate positioning is possible. It is in. Another object of the present invention is to realize a liquid crystal display device in which the positioning accuracy between the outer case and the shield case is improved, and the outer case and the shield case can be fitted and removed smoothly.

[0007]

According to the first aspect of the present invention,
A shield case storage part that fixes and stores the liquid crystal cell,
A shield case lid formed with a window opening that exposes the display area of the liquid crystal cell in a state of covering the shield case housing, and the shield case housing and the shield case lid. In the liquid crystal display device in which side walls are formed along the respective edges, and the side walls of the shield case housing portion and the shield case lid portion are fitted to each other, one of the shield case housing portion and the shield case lid portion is provided. One of the shield case accommodating portion and the shield case lid portion is formed with a retaining protrusion on one side wall and a protrusion engaging hole with which the retaining protrusion engages on the other side wall. A positioning protrusion is formed on one side so as to project in the direction of fitting / insertion with the other, and the other side is fitted with the positioning protrusion. Positioning hole is formed, with the positioning projection and the positioning holes that are closely in contact with both ends of the positioning direction, it is characterized. According to the present invention, the retaining protrusion formed on one side wall of the shield case housing portion and the shield case lid portion that fit with each other is engaged with the protrusion engagement hole formed on the other side wall. , It has an effect of preventing the fitting between the shield case housing portion and the shield case lid portion from coming off.
Further, since the positioning projection formed on one of the shield case housing portion and the shield case lid portion comes into close contact with both ends in the positioning direction of the positioning hole formed on the other,
The shield case housing portion and the shield case lid portion can be accurately positioned.

According to a second aspect of the present invention, the positioning protrusion and the positioning hole are fitted in one direction with respect to the side surface of the shield case housing portion and the side surface of the shield case lid portion to prevent the slip-out. The protrusion and the protrusion engagement hole,
It is characterized in that it is fitted in the other direction with respect to the side surface of the shield case housing portion and the side surface of the shield case lid portion. According to the second aspect of the present invention, the positioning projection and the positioning hole are fitted to each other to prevent rattling of the shield case housing portion and the shield case lid portion in one direction, and the retaining projection and the projection engaging portion. By fitting the fitting holes into the shield case, it is possible to prevent the shield case housing portion and the shield case lid portion from rattling in the other direction, so that the shield case can be more stably fixed and held.

The invention according to claim 3 is characterized in that the positioning projections project in the direction of fitting and inserting from the upper side wall of the shield case housing or the lower side wall of the shield case lid. In the present invention, since the positioning can be performed simply by inserting the positioning projection into the positioning hole while looking at the positioning hole and the positioning projection, the assembling work can be facilitated.

According to a fourth aspect of the present invention, the positioning projection is formed at an end of a side wall located near the retaining projection, and the projection engagement hole and the positioning hole are integrally formed. It is characterized by that. In the present invention, the positioning protrusion and the retaining protrusion are formed on one of the shield case housing portion and the shield case lid portion, and the protrusion engagement hole and the positioning hole are integrally formed on the other, so that the positioning is performed. Since the projecting projection can be inserted into the positioning hole while looking from the side of the shield case, the assembling work can be facilitated.

According to a fifth aspect of the present invention, the positioning projection is formed so as to project from the upper surface or the lower surface of the shield case, and is fitted into a positioning recess formed in the inner wall of the outer case that houses the shield case. Is characterized by. In the present invention, the shield case and the outer case can be assembled with high accuracy by inserting the positioning protrusion protruding from the upper or lower surface of the shield case into the positioning recess formed in the inner wall of the outer case. At this time, since the positioning protrusions only have to be inserted in the fitting direction with the outer case, it is possible to prevent the inner wall of the outer case from being damaged.

The invention according to claim 6 is characterized in that a polarizing plate is provided on the surface of the display region of the liquid crystal cell. In this invention, rattling between the shield case housing portion and the shield case lid portion can be prevented, so that the opening edge of the window opening portion formed in the shield case lid portion of the polarizing plate provided in the display region of the liquid crystal cell. It is possible to prevent contact with the edges. Therefore, the clearance between the peripheral edge of the polarizing plate and the opening edge of the window opening can be significantly reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a liquid crystal display device according to the present invention will be described below based on embodiments shown in the drawings. (Embodiment 1) FIGS. 1 and 2 show Embodiment 1 of the present invention.
Is shown. The present embodiment is an example in which the present invention is applied to a reflective liquid crystal display device. Reference numeral 10 in the figure denotes a liquid crystal display device, and a liquid crystal cell 11 formed by sealing liquid crystal (not shown) between two transparent substrates 11A and 11B facing each other,
The liquid crystal cell 11 is generally composed of a substantially container-shaped shield case housing 12 and a shield case lid 13 fitted into the shield case housing 12.

Polarizing plates 14 and 15 are provided on the front and back surfaces of the display area of the liquid crystal cell 11. In addition, the liquid crystal cell 11
On the surface of the polarizing plate 15 provided on the back surface of the display device, a reflection plate 16 that reflects light incident from the front surface side of the display area is provided. The liquid crystal cell 11 having such a structure is fixed in a substantially container-shaped frame 17. Further, the frame 17 is fixed inside the shield case storage portion 12. Inside the side wall 17A of this frame, the side wall 1
Stand up to the same height as 7A Shield case lid 13
A jetty portion 17B that supports the ridge is formed. As shown in FIGS. 1 and 2A and 2B, the side wall 12A of the shield case housing portion 12 is formed with a retaining projection 12B that protrudes outward. As shown in FIG. 1, the retaining projection 12B is formed in a projecting piece shape such that the side wall of the shield case housing portion 12 projects from the inside toward the outside and hangs down. Of the outer side surface of the side wall 12A is set to project more than the outer side surface of the side wall 12A from the outer side surface of the side wall 12A of the shield case housing portion 12 to the inner side surface of the side wall 13A of the shield case lid portion 13. . Further, the side wall 12A on which the retaining projection 12B is formed
The positioning projection 12 that projects upward is provided on the upper part of the
C is formed. One or a plurality of positioning protrusions 12C are formed on each of the four sidewalls 12A of the shield case housing portion 12, for example. Also,
The height of the positioning protrusion 12C is set to be the same as the upper surface of the shield case lid 13 when the shield case lid 13 is fitted in the shield case housing 12.

A window opening 13B for exposing the polarizing plate 14 provided on the display area of the liquid crystal cell 11 is formed substantially at the center of the shield case lid 13. In addition,
The opening edge of the window opening 13B is set to be close to the peripheral edge of the polarizing plate 14. Further, the shield case lid portion 13 is fitted with a side wall 12 </ b> A of the shield case storage portion 12 in a fitting clearance (the side wall 1 of the shield case storage portion 12).
2A from the outer side surface to the side wall 13A of the shield case lid 13
The distance to the inner surface of is set to such an extent that it is easy to fit the two. Further, the side wall 13A and the upper plate 13C of the shield case lid 13 are fitted with a projection engagement hole that engages with the retaining projection 12B in a state of being fitted with the shield case housing 12, and a positioning projection 12C. Positioning engagement hole 1 formed integrally with a positioning hole
8 are formed. As shown in FIGS. 1 and 2A and 2B, the positioning engagement hole 18 corresponds to the retaining projection 12B and the positioning projection 12C formed on the side wall 12A of the shield case housing portion 12. It is formed over the side wall 13A and the upper plate 13C of the shield case lid 13 at the position where the lower end 12a of the retaining projection 12B and the lower end 18a of the positioning engagement hole 18 come into contact with each other. The shield case housing portion 12 and the shield case lid portion 13 are kept in a fitted state. In addition, the positioning projection 12 is formed in the portion of the positioning engagement hole 18 formed on the upper surface of the shield case lid 13.
The width is set so that C fits closely. Therefore, the opposing end surfaces 18b, 18b of the positioning engagement hole 18 in the portion formed on the upper surface of the shield case lid portion 13 are arranged.
And the side surfaces 12b, 12b of the positioning protrusion 12C are in contact with each other in a fitted state to perform relative positioning of the shield case housing portion 12 and the shield case lid portion 13.
Such a positioning engagement hole 18 is provided in the positioning projection 12
Four, for example, four pieces are formed around the shield case lid 13 so as to correspond to the C and the retaining projections 12B. Both shoulders of the positioning projection 12C are shown in FIG.
As shown in (A) and (B), a notch is formed so that it can be easily fitted into the positioning engagement hole 18.

In the present embodiment, with the above-mentioned configuration, the shield case housing portion 12 and the shield case lid portion 13 have the lower end 12a of the retaining projection 12B and the lower end 18a of the positioning engagement hole 18. It is possible to hold the fitted state by abutting. In addition, the end faces 18b, 18b in the width direction, which face the positioning engagement hole 18,
By contacting both side surfaces of the positioning projection 12C with each other, positioning in the width direction can be performed. There are four pairs of the positioning protrusion 12C and the positioning engagement hole 18 as described above, and the pairs formed on the adjacent side walls have different positioning directions (form a right angle to each other). The unique positioning of the shield case housing portion 12 and the shield case lid portion 13 can be performed. In this way, since the shield case housing 12 and the shield case lid 13 can be accurately positioned, the polarizing plate 14 provided on the surface of the display area of the liquid crystal cell 11 and the window opening 13B of the shield case lid 13 are provided. It is possible to set a small distance from the opening edge. In particular, in the present embodiment, the positioning projection 12 of the shield case storage portion 12
Since the side surfaces 12b and 12b of C and the end surfaces 18b and 18b of the positioning engagement holes 18 of the shield case lid portion 13 are fitted to each other, it is possible to prevent rattling between the shield case housing portion 12 and the shield case lid portion 13. Therefore, in order to prevent rattling, it is not necessary to set the clearance between the outer surface of the side wall 12A of the shield case housing 12 and the inner surface of the side wall 13A of the shield case lid 13 to be extremely small. Case lid 1
It is possible to easily fit both in the work process of fitting the three. Therefore, it is possible to prevent the side walls 12A and 13A from rubbing against each other and damaging each other or deforming the shield case. Further, as in this embodiment, the polarizing plate 1 is provided on the surface of the liquid crystal cell 11.
4 is provided, the liquid crystal cell 11 fixed to the shield case housing portion 12 side and the shield case lid portion 13 do not deviate from each other in the surface direction, so that the polarizing plate 14 can be prevented from being damaged. Therefore, the distance between the opening edge of the window opening 13A and the display area can be set small,
A liquid crystal display device having a relatively large effective display area can be realized.

(Second Embodiment) FIG. 3 shows a second embodiment in which the present invention is applied to a transmissive liquid crystal display device. In this embodiment, the peripheral edge of the liquid crystal cell 11 is fixed to the shield case housing portion 12 with an adhesive 19. The polarizing plate 1 is provided on the front and back surfaces of the display area of the liquid crystal cell 11.
4 and 15 are provided. A window opening 12E for exposing the polarizing plate 15 provided in the liquid crystal cell 11 is formed on the bottom plate 20D of the shield case housing portion 12, and the polarizing plate 15 is exposed through the window opening 12E. The liquid crystal cell 11 is fixed. In addition, in this embodiment, the positioning engagement hole 18 is formed on the shield case housing portion 12 side. As shown in FIG. 3, the positioning engagement hole 18 is formed over the bottom plate 12D and the side wall 12A of the shield case housing portion 12. On the other hand, a side wall 13A of the shield case lid 13 is formed with a retaining projection 13D so as to project outward. As shown in the figure, the retaining projection 13D is formed so as to stand up from the lower end toward the upper end, and the base end portion of the standup is formed so as to stand up in an oblique direction. When the shield 12 and the shield case lid 13 are fitted together, the retaining projection 13D is guided to the side wall 12A of the shield case housing 12 and locked. Further, a positioning protrusion 13E that projects downward is formed at the lower end of the side wall 13A on which the retaining protrusion 12F is formed. This positioning projection 13E
The lower end of the shield case storage part 1 and the shield case cover part 13 are fitted together, and the shield case storage part 1
It is set to be flush with the lower surface of No. 2.

In this embodiment, the shield case storage section 1
2 and the shield case lid 13 are fitted to each other, the upper end 12F of the positioning engagement hole 18 and the upper end of the retaining projection 13D come into contact with each other, so that the shield case housing 12
The shield case lid 13 is maintained in a fitted state. Further, the positioning projections 13E are fitted to both ends of the positioning engagement holes 18 of the portion formed on the bottom plate 12D of the shield case housing portion 12, whereby the shield case housing portion 12 and the shield case lid portion 13 are separated from each other. The positioning protrusion 13E is positioned in the width direction. Since the liquid crystal display device of the present embodiment is a transmissive type, it is assumed to have a configuration such as a backlight system (not shown).

(Third Embodiment) FIGS. 4A and 4B show a third embodiment of the present invention. In this embodiment,
This is a transmissive liquid crystal display device, and has a configuration in which an outer case is attached to the outside of the shield case. In the present embodiment, as shown in FIG. 4A, the shield case storage unit 1
2 is for fitting the shield case lid 13 to
The configuration of the retaining projection 12B and the positioning projection 12C formed on the side wall 12A of the shield case housing portion 12 is as follows.
It is substantially the same as the above-described first embodiment. However, the length of the positioning projection 12C protruding from the side wall 12A is set to be long by a dimension that fits into the exterior case 20 described later. In addition, since this embodiment is a transmissive liquid crystal display device, a window opening 12E for exposing the polarizing plate 15 provided on the bottom surface of the display area of the liquid crystal cell 11 is opened in the bottom plate 12D of the shield case housing 12. Has been done. further,
The liquid crystal cell 11 is directly fixed to the shield case housing portion 12 with an adhesive 19. In this embodiment, as shown in FIG. 4B, the positioning protrusion 12C
And the positioning recess 20A formed on the inner surface of the upper part of the outer case 20 are fitted together, and the outer case is attached to the outside of the shield case. A window opening 20B for exposing the display area of the liquid crystal cell 11 is formed on the upper surface of the outer case 20.

Both shoulders of the positioning projection 12C are
The notch is formed as in the first and second embodiments. Therefore, the positioning projection 12C is easily fitted into the positioning recess 20A of the outer case 20. The positioning protrusions 12C can be positioned in the width direction by contacting the positioning recesses 20A of the outer case 20 on both end faces in the width direction. By forming one such positioning protrusion 12C on each of the four side walls 12A, the exterior case 20 can be uniquely positioned with respect to the shield case. In addition, since the positioning projection 12C is easily fitted into the positioning recess 20A of the outer case 20, the outer case 20 is not damaged when the outer case and the shield case are assembled or removed, and the positioning case 12C is removed. It is possible to prevent the generation of dust and the like and improve the quality of the liquid crystal display device.

(Fourth Embodiment) FIG. 5 is a perspective view showing a main part of a liquid crystal display device according to a fourth embodiment of the present invention. In this embodiment, the shield case housing 22 is fitted inside the shield case lid 23. As shown in the figure, a side wall 23A of the shield case lid 23 is provided with a retaining engagement hole 23G which is one of retaining engagement portions. Further, the upper side wall of the retaining engagement hole 23G is formed to be curved inward as a positioning bulging portion 23H. On the other hand, on the side wall 22A of the shield case housing portion 22, a retaining projection 22F corresponding to the retaining engagement hole 23G of the shield case lid portion 23, which is the other retaining engagement portion, protrudes outward. Is formed. This retaining projection 22F
Is a shield case storage part 22 and a shield case cover part 2
3 is fitted in the retaining engagement hole 23G, and the lower end surface 22G thereof abuts the upper end surface of the positioning bulging portion 23H, thereby maintaining the fitted state of the shield case. have. Further, the shield case housing 22 and the shield case lid 23 are fitted to the side wall 22A and the lower plate 12C below the retaining projection 22F,
A positioning notch 22H is formed as a positioning fitted portion into which the positioning bulging portion 23H is inserted.
The width dimension of the positioning notch 22H is set shorter than the width dimension of the positioning bulging portion 23H. Also,
The positioning bulging portion 23H is provided in the shield case storage portion 22.
It is set so as to be in pressure contact with the widthwise end edges 22I, 22I of the positioning notch 22H in a state where the shield case lid 23 and the shield case lid 23 are fitted together.

Next, referring to FIGS. 6 (A) and 6 (B), the function of positioning by the positioning bulging portion 23H and the positioning notch 22H will be described. First, when the shield case storage portion 22 and the shield case lid portion 23 are fitted,
The retaining projection 22F enters into the retaining engagement hole 23G, and the lower end surface 22G of the retaining protrusion 22F and the upper end surface of the positioning bulging portion 23H come into contact with each other to provide retaining action. At this time, as shown in FIG. 6 (A), the center of the positioning bulging portion 23H in the width direction is the positioning notch 22H.
In the case where the positioning bulging portion 23H is in contact with the center in the width direction, the curved surface of the positioning bulging portion 23H contacts only one edge 22I of the positioning notch 22H. At this time, since the positioning bulging portion 23H is urged inward by the elastic force, the shield case lid portion 23 slides along the edge 22I in the direction indicated by the arrow in the figure to move the bulging portion 23H as shown in FIG. ), Both end edges 22I, 22I of the positioning notch 22H
Positioning is performed by stopping at the position where it abuts.

In this embodiment, the bulging portion 23H for positioning is used.
Has a curved structure inwardly and has a positioning notch 22
Although it is configured to make contact with the end edge 22I of H by a curved surface, as shown in FIG. 7, it is of course possible to make contact with the tapered portions 23I, 23I formed on both sides of the positioning bulging portion 23H. Also in this embodiment, the pair of the positioning bulging portion 23H and the positioning notch 22H is provided on each of the four side walls, and the shield case housing portion 22 is provided.
It is possible to uniquely position the shield case cover 23 and the shield case cover 23. Further, in the present embodiment, the positioning does not depend on the fitting surface between the shield case housing portion 22 and the shield case lid portion 23, but depends on the contact between the positioning bulging portion 23H and the positioning notch 22H. Since the side walls 22A and 23A to be fitted do not have to be closely fitted to each other, it is possible to design with a sufficient dimension.

(Fifth Embodiment) FIG. 8 is a perspective view of a main portion of a fifth embodiment of the present invention. In this embodiment,
This is a configuration in which the retaining engagement hole 23G on the shield case lid portion 23 side and the retaining protrusion 22F on the shield case housing portion 22 side in the fourth embodiment described above are omitted, and other configurations are the same as in the fourth embodiment. is there. Therefore, in the present embodiment, as shown in FIG.
The upper edge 22J of the 2H and the upper end surface of the positioning bulging portion 23H come into contact with each other to perform a retaining function.
Note that FIG. 9 shows a modification in which both side portions of the positioning bulging portion 23H of the shield case lid portion 23 of the present embodiment are tapered portions 23I. Also in the present embodiment, as in the case of the fourth embodiment, the positioning does not depend on the fitting surface between the shield case housing portion 22 and the shield case lid portion 23, but the bulging portion for positioning 23H and the notch for positioning 22H. Since it depends on the contact with the side wall 2
It is not necessary that the 2A and the 23A are closely fitted to each other, which allows a dimensional design with a margin.

Although the first to fifth embodiments have been described above, the present invention is not limited to these, and various design changes associated with the gist of the configuration can be made. The structure of the liquid crystal display device in each of the above embodiments may be either a transmissive type using a backlight or a reflective type provided with a reflective member separate from the reflective electrode. In the transmissive type, the backlight is housed in a shield case. It may be provided inside the portion 12. Further, a switching element such as a TFT may be connected to a pixel electrode formed by dividing it in a matrix to perform active driving. In each of the above-described embodiments, one positioning protrusion and one retaining protrusion are provided in one positioning engagement hole for each side surface of the liquid crystal display device, but they are not limited to this.
A plurality of positioning protrusions and a plurality of retaining protrusions may be provided in the plurality of positioning engagement holes according to the size of the liquid crystal display device.

[0026]

As is apparent from the above description, according to the present invention, there is realized a liquid crystal display device capable of accurate positioning without rattling between the housing side and the lid side of the shield case. Has the effect. Therefore, when a shock is applied to the shield case, it is possible to prevent a fitting failure from occurring in the shield case. Further, according to the present invention, the positioning accuracy between the outer case and the shield case is improved, and the fitting and removal can be smoothly performed without damaging the outer case and the shield case.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2A is a perspective view showing Embodiment 1 of the present invention,
(B) is the same side view.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4A is a perspective view showing Embodiment 3 of the present invention,
(B) is the same sectional view.

FIG. 5 is a perspective view showing a fourth embodiment of the present invention.

FIG. 6A is a plan explanatory view when the shield case housing 12 and the shield case lid 13 are fitted to each other in Embodiment 4 of the present invention, and FIG. 6B is the shield case housing 12;
The plane explanatory view showing the state where the shield case lid 13 and the shield case lid 13 are properly positioned.

FIG. 7 is a perspective view showing a modification of the fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a fifth embodiment of the present invention.

FIG. 9 is a perspective view showing a modified example of the fifth embodiment of the present invention.

FIG. 10A is a plan view of a conventional liquid crystal display device,
(B) is the same side view.

FIG. 11 is a sectional view of a main part of a conventional liquid crystal display device.

12A is a perspective view showing an engaging portion of a conventional liquid crystal display device, and FIG. 12B is a side view thereof.

FIG. 13A is an explanatory view showing a case where the width dimension of the shield case storage portion is shorter than the width dimension of the shield case lid portion in the conventional liquid crystal display device, and FIG. Explanatory drawing which shows a case where it is longer than the width dimension of a shield case cover part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Liquid crystal display device 11 Liquid crystal cell 12 Shield case storage part 12A Side wall 12B Retaining protrusion 12C Positioning protrusion 12G Retaining engagement hole 12H Positioning bulge 13 Shield case lid 13A Side wall 13B Window opening 13F Retaining protrusion 13H Positioning Notch 14 Polarizing Plate 18 Positioning Engagement Hole 20 Exterior Case 20A Positioning Recess

Claims (6)

, [Claims] 1. A shield case accommodating part for fixing and accommodating a liquid crystal cell, and a shield case lid part having a window opening part for exposing the display area of the liquid crystal cell in a state of covering the shield case accommodating part. A shield case consisting of, a side wall is formed along the respective peripheral edges of the shield case storage portion and the shield case lid portion,
In a liquid crystal display device in which the side walls of the shield case housing and the shield case lid are fitted to each other, a retaining protrusion is formed on one of the side walls of the shield case housing and the shield case lid. In addition, a protrusion engagement hole with which the retaining protrusion is engaged is formed on the other side wall, and in one of the shield case storage portion and the shield case lid portion, in the direction of fitting / inserting with the other. A projecting positioning projection is formed, and a positioning hole that fits with the positioning projection is formed on the other side, and the positioning projection and the positioning hole are in close contact with each other at both ends in the positioning direction. Liquid crystal display device. 2. The positioning projection and the positioning hole are fitted in one direction with respect to the shield case housing side surface and the shield case lid side surface, and the retaining projection and the projection engaging hole. 2. The liquid crystal display device according to claim 1, wherein is fitted in the other direction with respect to the side surface of the shield case housing portion and the side surface of the shield case lid portion. 3. The positioning projection is projected from a side wall upper portion of the shield case housing portion or a side wall lower portion of the shield case lid portion in a fitting / inserting direction. Liquid crystal display device. 4. The positioning protrusion is formed at a side wall end located near the retaining protrusion, and the protrusion engagement hole and the positioning hole are integrally formed. The liquid crystal display device according to any one of claims 1 to 3. 5. The positioning projection is formed so as to project from the upper surface or the lower surface of the shield case, and is fitted into a positioning recess formed in an inner wall of an outer case that houses the shield case. The liquid crystal display device according to claim 1. 6. The surface of the display area of the liquid crystal cell,
A liquid crystal display device according to any one of claims 1 to 5, further comprising a polarizing plate.