JP2009139640A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display, having a structure where a liquid crystal display element is held by a housing via a spacer, the liquid crystal display device such that in reducing the material cost of the spacer and improvement in (sticking) operation efficiency, prevention against production of dust in assembling process and infiltration of dust into an optical system, including the liquid crystal display element, and to provide a housing structure and a spacer shape that provide high holding precision of the liquid crystal display element. <P>SOLUTION: A recessed portion 37 is provided to a corner of a bottom portion 32 of the housing 30, and a cut 38 is formed in a corner of a sidewall portion 34. Then the one spacer 20 which is sequentially sectioned into an L shape in a cord shape is stuck on the bottom portion 32 of the housing 30 from the cut 38 along the sidewall portion 34, and a curved portion 23 formed by bending the spacer 20 is stored inside the recessed portion 37. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a structure in which a liquid crystal display element is held in a housing (housing) via a spacer.

  Conventionally, regarding the liquid crystal display device of this type of structure, the following technical proposals have been made. The liquid crystal display device 53 is configured by holding a liquid crystal display element 50 on a casing 52 via a ring-shaped spacer 51 made of an elastic body (see FIG. 8) (see, for example, Patent Document 1). .

  In this case, the ring-shaped spacer 51 is generally manufactured by a method of punching a flat plate-like elastic member in an annular shape with a mold, and the area utilization rate of the spacer 51 with respect to the elastic flat plate is extremely low. For this reason, there are problems such as waste of resources and an increase in manufacturing costs.

  Therefore, it is conceivable to use a plurality of string-like spacers 54 as shown in FIG. 9 instead of the ring-like spacers 51. That is, a string-like silicone rubber molded body is adhered to one surface of a string-like flexible plastic sheet having no stretchability, and an adhesive is applied to the other surface.

  In this case, the string-like spacers 54 are generally arranged independently of each other at the positions of the outer peripheral ends of the four sides of the liquid crystal display element 50 with respect to the casing 52, and the spacers 54 are adhered to each other. Either the liquid crystal display element 50 side or the housing 52 side is selected in consideration of the workability of the process.

However, when the external shape of the liquid crystal display element is rectangular, two types of lengths of spacers 54 are required, and the spacer 54 preparation process, the peeling operation of the adhesive layer protector (release paper) of the four spacers 54, and four places Increase in manufacturing man-hours such as sticking work is inevitable.
JP-A-9-318952

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a spacer material in a liquid crystal display device having a structure in which a liquid crystal display element is held in a housing (housing) via a spacer. Reduces costs and improves (sticking) work efficiency, prevents generation of dust in the assembly process and entry of dust into the optical system including the liquid crystal display element, and enables high holding accuracy of the liquid crystal display element It is to realize a liquid crystal display device having a housing structure and a spacer shape.

In order to solve the above-mentioned problems, a first aspect of the present invention includes a liquid crystal display element, a housing that holds the liquid crystal display element, and an elastic body that is interposed between the liquid crystal display element and the housing. With
The housing has a window hole corresponding to the display area of the liquid crystal display element, and has a housing portion for the liquid crystal display element, which is composed of a bottom portion and four side wall portions that are perpendicular to each other and rise from the top surface of the bottom portion.
The liquid crystal display element is held in the liquid crystal display element housing portion of the housing via a single string-like elastic body attached to the upper surface of the bottom portion of the housing. is there.

  The invention described in claim 2 of the present invention is characterized in that, in claim 1, a recess is provided in a corner of the bottom portion in the liquid crystal display element housing portion.

  Further, in the invention described in claim 3 of the present invention, in any one of claims 1 and 2, the side wall portion has a notch portion having a predetermined width along the inner surface of the side wall portion. The bottom surface of the notch is located on the same plane as the top surface of the bottom.

  The invention described in claim 4 of the present invention is characterized in that, in claim 3, a plurality of the notches are provided.

  The invention described in claim 5 of the present invention is the elastic body according to any one of claims 1 to 4, wherein the elastic body has a substantially L-shaped cross section perpendicular to the longitudinal direction of the elastic body. In addition, one of the substantially L-shaped pieces is along the side wall portion, and the other piece of the substantially L-shaped portion is along the upper surface of the bottom portion.

  Further, in the invention described in claim 6 of the present invention, in any one of claims 1 to 5, the elastic body is located on the side wall portion at a position corresponding to a corner portion of the liquid crystal display element housing portion. A notch line is provided from the corresponding end to the opposite end.

  In the liquid crystal display device of the present invention, a recess is provided at the corner of the bottom of the housing that holds the liquid crystal display element, and a notch is formed at the corner of the side wall. Then, one string-like spacer having an L-shaped cross section is attached to the upper surface of the bottom of the housing in order from the notch portion along the side wall portion, and the curved displacement portion generated in the bent portion of the spacer is placed in the recess. I tried to accommodate it.

  As a result, a single string-like spacer can be used without cutting. Therefore, the spacer is effectively used without waste, and the material cost and the processing cost can be reduced.

  Moreover, the displacement part by the compressive force which arises in the bending part of a spacer can be accommodated in the recessed part of the corner | angular part of a housing bottom part. Therefore, the surface on which the liquid crystal display element is placed is located on the same plane over the entire length of the spacer, and it is possible to increase the holding accuracy of the liquid crystal display element in the tilt direction with respect to the housing.

  In addition, a notch portion is provided in the side wall portion of the housing, and an attaching operation of substantially making a round of the side wall portion while drawing one end portion of the spacer along the side wall portion sequentially from the notch portion is made possible. Therefore, the workability of the spacer attaching operation is improved, and the manufacturing cost can be reduced.

  In addition, the spacer has an L-shaped cross section so that the end face of the liquid crystal display element and the side wall of the housing, and the lower face of the liquid crystal display element and the bottom of the housing are positioned with the spacer interposed therebetween. For this reason, generation of dust due to contact between the liquid crystal display element and the housing and entry of dust into the optical system including the liquid crystal display element are prevented, eliminating optical failure factors, and absorbing external vibration and shock. This contributes to improving the reliability of the liquid crystal display element.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 7 (the same parts are given the same reference numerals). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is an exploded view of the liquid crystal display device of the present invention. The liquid crystal display device 1 includes a liquid crystal display element 10, a spacer 20, and a housing (housing) 30, and each component member is as follows.

  In the liquid crystal display element 10, a pair of transparent substrates arranged at a predetermined interval are bonded together with an annular sealing material (not shown) positioned between the transparent substrates, and surrounded by the pair of transparent substrates and the sealing material. A liquid crystal material (not shown) is sandwiched between the regions.

  The spacer 20 has a string shape made of a flexible material such as silicone rubber or fluororubber, and has a substantially L-shaped cross section in a direction perpendicular to the longitudinal direction. An adhesive material (double-sided tape) is attached to the L-shaped piece (plane portion 21), and a protective film (not shown) is attached to the surface of the adhesive material.

  The housing 30 includes a housing portion 35 for the liquid crystal display element 10 including a bottom portion 32 having a window hole 31 at the center and a side wall portion 34 rising from four peripheral edges of the rectangular upper surface 33 of the bottom portion 32. Is provided at a position corresponding to the display area of the liquid crystal display element 10 when the liquid crystal display element 10 is accommodated in the accommodating portion 35.

  Concave portions 37 extending from the inner side 36 to both sides are provided at three or more corner portions of the bottom portion 32 of the housing 30, and predetermined portions along the inner surface of the side wall portion 34 are formed at one or more corner portions of the side wall portion 34. A notch 38 having a width is formed, and the lower surface 39 of the notch 38 is substantially flush with the upper surface 33 of the bottom 32.

  FIG. 2 shows a procedure for attaching the spacer 20 to the housing 30. First, as a pre-process, the string-like spacer 20 is cut based on the inner peripheral length of the side wall portion 34 of the housing 30, and the protective film attached to the adhesive material on the outer surface of the flat portion 21 of the spacer 20 is peeled off.

  Then, as shown in (a), the outer surface of the one end piece (vertical portion 22) of the substantially L-shaped spacer 20 is brought into contact with the side wall portion 34a on the side orthogonal to the notch portion 38 of the housing 30, The outer surface of the flat portion 21 of the spacer 20 is adhered to the upper surface 33 of the bottom portion 32 of the housing 30 via an adhesive material.

  Thereafter, as shown in (b) to (c), the other end side of the spacer 20 is sequentially routed along the inner circumference of the side wall portions 34a, 34b, 34c, and 34d of the housing 30, and the side wall portion 34 is rotated substantially once. Then, the spacer 20 is accommodated in the liquid crystal display element accommodating portion 35 of the housing 30 as shown in FIG.

  When the liquid crystal display element 10 is placed on the inner surface of the flat portion 21 of the spacer 20, the liquid crystal display device 1 is completed with the liquid crystal display element 10 held by the housing 30 via the spacer 20 (FIG. 3). (See the cross-sectional view).

  By the way, in the assembly process of the liquid crystal display device, the flat surface portions 21 positioned at the respective corners of the substantially L-shaped spacer 20 are subjected to a stress that rises upward due to the compression force applied from both sides during bending or hangs downward. receive.

  At this time, the flat portion 21 of the spacer 20 is a portion where the liquid crystal display element 10 is arranged. If the flat portion 21 is raised upward as shown in FIG. 4, the arrangement of the liquid crystal display element 10 is arranged on the upper surface 33 of the bottom portion 32 of the housing 30. It will be in a state inclined with respect to. Therefore, in the housing 30 of the liquid crystal display device 1 of the present invention, as shown in FIG. 5, concave portions 37 extending from the inner side 36 to both sides are provided at the corners of the bottom portion 32 of the housing 30. The curved portion 23 depending on the lower side of 21 is accommodated in the recess 37.

  Therefore, the inner surface 24 of the planar portion 21 of the spacer 20 is positioned on the same plane over the entire circumference on the upper surface 33 of the bottom portion 32 of the housing 30, and the liquid crystal display element 10 is placed on the housing 30 via the spacer 20. It becomes possible to keep the surface parallel to the upper surface 33.

  Further, the end surface 11 of the liquid crystal display element 10 and the inner surface 40 of the side wall portion 34 of the housing 30, and the lower surface 12 of the liquid crystal display element 10 and the upper surface 33 of the bottom portion 32 of the housing 30 are the vertical portion 22 and the flat portion 21 of the spacer 20, respectively. It is located across. Therefore, when the liquid crystal display element 10 is set in the housing 30 in the assembly process of the liquid crystal display device, the housing 30 and the liquid crystal display element 10 do not come into contact with each other, and shaving of the housing 30 does not occur. Even if there is other foreign matter, it plays a role of preventing intrusion into the optical system including the liquid crystal display element 10. As a result, no foreign matter adheres to the liquid crystal display element 10, which contributes to the realization of a liquid crystal display device with good display quality.

  Furthermore, the spacer is made of a material having flexibility, and also plays a role of protecting the liquid crystal display element 10 by absorbing external vibration and impact.

  The concave portion 37 provided in the bottom 32 of the housing 30 in which the curved portion 23 of the spacer 20 is accommodated may be deep enough to accommodate the curved portion 23 of the spacer 20, and the shape thereof is particularly special. It is not limited.

  In the previous embodiment, the use of a spacer having an L-shaped cross section has been proposed. However, a spacer molded or manufactured to have an L-shaped cross section is a very expensive member compared to a flat spacer.

  For this reason, the inventor proposes a method of forming a spacer having a substantially L-shaped cross section by processing a flat spacer.

  A half-cut notch 25 is made in the flat spacer 20 or the surface of the spacer 20 wound in a roll shape on which the adhesive material 26 is attached (see the sectional view of FIG. 6A), or the adhesive material. A half-cut incision 25 is made in the surface where no is attached (see the sectional view of FIG. 7A). The direction of the cut 25 is parallel to the longitudinal direction of the spacer 20.

  The entire spacer 20 is deformed so that the portion where the notch 25 is cut is made outside (see the cross-sectional view of FIG. 6B), or the entire spacer 20 is deformed so that the portion where the notch 25 is cut is made inside (see FIG. 7). (Refer to the sectional view of (b)), by sticking the adhesive surface to the housing 30, it can function as a spacer 20 having a substantially L-shaped cross section.

  This method can be implemented at a very low cost because only half-cut processing is performed on a flat or roll spacer member.

  As described above, the liquid crystal display device of the present invention holds the liquid crystal display element in the housing via the spacer, and in that case, the single string-like spacer is stuck to the housing without cutting. I did it. As a result, the spacer is effectively used without waste, and the material cost and the processing cost can be reduced.

  Also, a concave portion extending from the inner side to both sides is provided at the corner of the bottom of the housing, and the displacement portion due to the compressive force applied from both sides of the flat portion located at the corner of the spacer having a substantially L-shaped cross section is placed in the concave portion. Was able to be accommodated. As a result, the surface on which the liquid crystal display element is placed is located on the same plane over the entire length of the spacer, and the holding accuracy of the liquid crystal display element in the tilt direction with respect to the housing can be increased.

  Also, a notch portion is provided on the side wall portion of the housing, and one end portion of the spacer is attached to the side wall portion on the side orthogonal to the notch portion of the housing, and is sequentially routed around the side wall portion while being routed around the side wall portion. Made possible. As a result, the workability of the spacer attaching operation was improved, and the manufacturing cost could be reduced.

  Furthermore, by providing a plurality of notches, it is possible to start the affixing operation from a plurality of locations without limiting the start position of the spacer affixing operation to one location. As a result, the degree of freedom of the setting position of the housing at the start of work was increased, and workability was improved.

  Further, when the spacer is flat, there is nothing to shield between the side wall portion of the housing and the liquid crystal display element, and the side wall surface is scraped due to interference between the side wall portion of the housing and the liquid crystal display element during assembly work, or the liquid crystal display element As a result, a phenomenon such as scraping of the outer periphery occurs, and a defect of the liquid crystal display device occurs due to intrusion of dust into the optical system including the liquid crystal display element.

  On the other hand, in the liquid crystal display device of the present invention, the spacer has an L-shaped cross section so that the end surface of the liquid crystal display element and the side wall of the housing, and the lower surface of the liquid crystal display element and the bottom of the housing are positioned with the spacer interposed therebetween. I did it. As a result, generation of dust and intrusion of dust into the optical system are prevented, and optical failure factors are eliminated, and vibrations and impacts from outside are absorbed to contribute to improving the reliability of the liquid crystal display element. .

FIG. 3 is an exploded view of an embodiment of the present invention. It is an assembly-process figure of embodiment of this invention. It is a fragmentary sectional view of the embodiment of the present invention. It is a fragmentary sectional view of a comparative example. It is a fragmentary sectional view of the embodiment of the present invention. It is processing explanatory drawing of the spacer which concerns on embodiment of this invention. Similarly, it is processing explanatory drawing of the spacer which concerns on embodiment of this invention. It is an exploded three-dimensional view concerning a conventional example. It is a perspective view of the spacer which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 10 Liquid crystal display element 11 End surface 12 Lower surface 20 Spacer 21 Flat part 22 Vertical part 23 Curved part 24 Inner surface 25 Notch 26 Adhesive material 30 Housing 31 Window hole 32 Bottom part 33 Upper surface 34 Side wall part 34a, 34b, 34c, 34d Side wall Part 35 liquid crystal display element accommodating part 36 inner side 37 recessed part 38 notch part 39 lower surface 40 inner surface

Claims (6)

A liquid crystal display element, a housing for holding the liquid crystal display element, and an elastic body interposed between the liquid crystal display element and the housing,
The housing has a window hole corresponding to the display area of the liquid crystal display element, and has a housing portion for the liquid crystal display element, which is composed of a bottom portion and four side wall portions that are perpendicular to each other and rise from the top surface of the bottom portion.
The liquid crystal display element is held in the liquid crystal display element housing portion of the housing through a single elastic string attached to the upper surface of the bottom portion of the housing. apparatus.   The liquid crystal display device according to claim 1, wherein a concave portion is provided in a corner portion of the bottom portion in the liquid crystal display element housing portion.   The said side wall part has a notch part which has a predetermined width along the inner surface of this side wall part, The bottom face of the said notch part is located in the same plane as the upper surface of the said bottom part, or 3. The liquid crystal display device according to any one of 2 above.   The liquid crystal display device according to claim 3, wherein a plurality of the notches are provided.   The elastic body has a substantially L-shaped cross-section perpendicular to the longitudinal direction of the elastic body, and one piece of the substantially L-shape is along the side wall portion, and the other piece of the substantially L-shaped piece. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is along an upper surface of the bottom portion.   The elastic body is characterized in that a cut line is provided at a position corresponding to a corner portion of the liquid crystal display element housing portion from an end portion on the side corresponding to the side wall portion to an end portion on the opposite side. The liquid crystal display device according to any one of claims 1 to 5.

Images