JP2004151277A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device having a structure that functions as a guide in assembly of a protective panel formed of an acrylic plate and a chassis formed of a metallic member for supporting the protective panel and absorbs the expansion of the protective panel after assembled to thereby prevent the deformation and the strain of the protective panel. <P>SOLUTION: The display device is composed of the protective panel formed of a transparent member and the chassis on which the protective panel is fixed from the outside and a liquid crystal display panel is fixed from the inside, wherein at least two projected guide parts are formed at a part of the chassis on which the protective panel is fixed, and the protective panel is fixed to the chassis in such a manner that the outside face of a recessed guide parts of the protective panel which is formed to be loosely fitted with the projected guide parts is in contact with the outside face of the projected guide parts. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device, and more particularly, to a mounting mechanism of an acrylic panel for protecting a liquid crystal display of an operation monitoring control panel, and is not limited to a liquid crystal display of an operation monitoring control panel. More particularly, the present invention relates to a display device equipped with a display device whose installation environment temperature is severe.
[0002]
[Prior art]
As shown in FIG. 8, the display device according to the related art has a structure in which a liquid crystal panel 111 is covered with a protection panel 112. In this structure, a metal member chassis 113 is attached to a substantially rectangular liquid crystal panel 111. A protective panel 112 made of a transparent or translucent acrylic plate is attached to the liquid crystal panel 111 with a certain gap between the liquid crystal panel 111 and the transparent panel. The protection panel 112 has a structure mounted on four sides by support metal fittings 114. Further, the outer peripheral position of the protection panel 112 is provided with a blind portion 115 which is solid-printed in a band shape having a predetermined width.
Further, the support fitting 114 is formed in a right-angled shape, and has a structure in which flanges 116a and 116b are provided at the corners for engaging the outer corners of the protection panel 112.
[0003]
Now, the protection panel 112 made of an acrylic plate is attached to the chassis 113, which is a bracket made of a metal member, with the support metal 114. In order to attach the protection panel 112 accurately, as shown in FIG. The front end of the protection panel 112 sandwiched between the metal fitting 114 and the chassis 113 is brought into contact with the inner side surface of the support metal fitting 114 so that the positioning is performed with the clearance (117) eliminated.
When mounted in this manner, the clearance (117) of the protection panel 112 for positioning is eliminated, and there is no portion for absorbing the thermal expansion displacement of the acrylic plate.
In order to solve this problem, as shown in FIG. 9B, a protective panel 112 taking into account the thermal deformation prevention of the acrylic plate is provided with a predetermined clearance 118 between the support fitting 114 and the protective panel 112 sandwiched between the chassis 113. By attaching the acryl plate, the deformation due to the thermal expansion displacement of the acrylic plate can be prevented (for example, see Patent Document 1).
[0004]
As described above, in addition to the method of providing the clearance 118 of the support fitting 114 that supports the protection panel 112, when the protection panel is mounted in the frame, the protection panel is thermally expanded by using an elastic support member. In some cases, however, the change in expansion is absorbed (for example, see Patent Document 2).
[0005]
As another technique for preventing deformation of the protection panel, there is a technique for providing a display opening and storing a polarizing plate therein to prevent warpage and distortion (see, for example, Reference 3).
Patent literatures include the following. See FIG. 2 on page 3 for JP-A-6-95110, see FIG. 1 on page 2 for JP-A-4-362612, and see page 1 on page 3 for JP-A-5-53106. See diagram.
[0006]
[Patent Document 1]
JP-A-6-95110 [Patent Document 2]
JP-A-4-362612 [Patent Document 3]
JP-A-5-53106
[Problems to be solved by the invention]
However, the protection panel for protecting the liquid crystal panel in the display device described in the related art uses a resin acrylic plate, and this acrylic plate has a linear expansion coefficient smaller than that of a surrounding metal chassis. Since they are large, the displacement amounts of the two greatly differ depending on a change in ambient temperature.
For this reason, when the acrylic plate is fixed to the chassis side with screws or by using a support bracket to fix the position of the acrylic plate, the thermal deformation is reduced as shown in FIG. 9A described above. There is a problem that the panel surface cannot be absorbed and is distorted.
In order to avoid this distortion, as shown in FIG. 9B described above, if a clearance is provided between the support bracket and the protection panel in consideration of the amount of thermal deformation, positioning at the time of assembly cannot be taken. In addition, play is caused by the clearance, which causes a problem in assembling and manufacturing the protection panel.
In general, the distance between the effective display area and the outer frame (chassis) of a liquid crystal display panel is several millimeters (about 2 mm). If the protection panel cannot be positioned, the solid corresponding to the display area is removed. The portion (blindfold) overlaps the display area or the outer frame of the liquid crystal display, and a part of the display area is hidden or a part of the outer frame of the liquid crystal display is seen, which causes inconvenience. There's a problem.
Therefore, there is a problem to be solved in a display device having a structure that achieves both positioning and absorption of displacement due to thermal expansion.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a display device according to the present invention has the following configuration.
[0009]
(1) A display device comprising: a protection panel formed of a transparent member; and a chassis to which the protection panel is mounted from the outside and a liquid crystal display panel is mounted from the inside.
At least two guide projections are formed on a part of the chassis where the protection panel is mounted, and an outer surface of a guide recess of the protection panel formed to have a size that can be loosely fitted to the guide projections is formed by the guide projections. The protection panel is attached to the chassis so as to contact the outer surface of the chassis.
(2) The display device according to (1), wherein the guide protrusions are provided in a facing positional relationship.
(3) The guide projection is formed at a corner portion, and the inside surface in the corner direction of the guide recess of the protection panel formed to have a size that can be loosely fitted to each of the guide projections is located outside the corner direction of the guide projection. The display device according to (1), wherein the protection panel is attached to the chassis so as to be in contact with a side surface.
(4) The display device according to (1), wherein the protection panel is formed of an acrylic plate, and the chassis is formed of a metal member.
[0010]
As described above, when the protection panel is mounted on the chassis, the guide projections and the guide recesses are engaged with each other to perform positioning and assembly. After assembling, the change in the expansion of the protection panel is guided by the guide projections, so that accurate assembling can be performed at the time of assembly. By escaping only by the amount, distortion and deformation of the protection panel can be eliminated.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a display device according to the present invention will be described with reference to the drawings.
[0012]
As shown in FIG. 1, the display device of the present invention has a protection panel 11 formed of a rectangular acrylic plate formed of a transparent resin member, a protection panel 11 attached from the outside, and a liquid crystal panel 12 attached from the inside. And a chassis 13 formed of a metal member.
At least two guide projections 14 are formed on a part of the chassis 13 where the protection panel 11 is mounted, and the outer side surface of the guide recess 15 of the protection panel 11 formed to have a size that can be loosely fitted to the guide projections 14. The protection panel 11 is attached to the chassis 13 so as to be in contact with the outer surface of the guide projection 14.
[0013]
The protective panel 11 forms a blindfold portion 20 which is printed in a band shape on an outer peripheral edge formed in a square shape, and the inside of the blindfold portion 20 becomes a display area 21. The four sides of the corner are provided with a guide recess 15 made of a hole.
[0014]
The chassis 13 has a guide convex portion 14 for loosely fitting the guide concave portion 15 provided on the protection panel 11 by embossing. The guide protrusion 14 is used for positioning the protection panel 11 and serves as a guide when the protection panel 11 is expanded.
[0015]
More specifically, as shown in FIGS. 2 to 4, the guide protrusions 14 have a configuration in which the guide protrusions 14 are disposed so as to face each other. In addition, the corner-direction inner side surface 16 of the guide recess 15 of the protection panel 11 of the protection panel 11, which is formed to have a size that can be loosely fitted to each guide protrusion 14, is formed on the corner-direction outer surface 17 of the guide protrusion 14. The protection panel 11 is attached to the chassis 13 so as to be in contact with the chassis 13 and is engaged and locked by the support bracket 18 (see FIG. 2).
[0016]
As shown in FIG. 1, the support bracket 18 is formed in a right-angled shape, and has a structure in which flanges 19 a and 19 b are provided at the corners to engage outer corners of the protection panel 11.
[0017]
In order to incorporate the protection panel 11 having such a structure into the chassis 13, first, as shown in FIG. 4, guide projections 14 provided on four sides of the chassis 13 are provided with guide recesses 15 of the protection panel 11. What is necessary is just to position and engage in the state which contacted the inner surface 16 in the corner direction.
[0018]
After the engagement and assembly, the liquid crystal panel 12 operates, the backlight of the liquid crystal panel 12 generally generates heat, and when the temperature of the chassis 13 supporting the liquid crystal panel 12 increases, the protection panel formed of an acrylic plate is formed. When the temperature of 11 rises, it expands. When the protection panel 11 expands, as shown in FIGS. 5 to 7, the protection recesses 15 engaged and locked by the guide projections 14 at the four corners of the protection panel 11 due to the expansion of the entire protection panel 11. The guide recess 15 moves in the corner direction, absorbs the movement, and the inner surface 17 a (see FIG. 7) in the opposite direction to the corner comes into contact with the guide protrusion 14 and is locked.
[0019]
【The invention's effect】
As described above, the display device according to the present invention functions as a positioning guide when the protection panel is attached, functions to absorb the expansion of the protection panel after attachment, and functions as the protection panel. There is an effect that the blindfold portion of the chassis portion can be hidden and distortion due to thermal deformation of the protection panel can be suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view of a display device according to the present invention.
FIG. 2 is a plan view of a main part with the protection panel attached.
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, showing a support state of the protection panel, the chassis, and a support bracket.
FIG. 4 is an explanatory view showing an engagement state of a corner portion of the protection panel.
FIG. 5 is an explanatory diagram showing a state when the protection panel is expanded.
6 is a sectional view taken along the line BB shown in FIG.
FIG. 7 is an explanatory diagram showing an expanded state of a corner portion of the protection panel.
FIG. 8 is a schematic exploded perspective view showing a display device according to the related art.
FIG. 9 is a cross-sectional view showing a support state by a chassis, a protection panel, and a support metal in the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Protective panel 12 Liquid crystal panel 13 Chassis 14 Guide convex part 15 Guide concave part 16 Inner side face 17 in the corner direction Outer side face 18 in the corner direction Support bracket 19a Flange part 19b Flange part 20 Blind part 21 Display area

Claims (4)

A display device comprising: a protection panel formed of a transparent member; and a chassis to which the protection panel is attached from the outside and a liquid crystal display panel is attached from the inside,
At least two guide projections are formed on a part of the chassis where the protection panel is mounted, and an outer surface of a guide recess of the protection panel formed to have a size that can be loosely fitted to the guide projections is formed by the guide projections. A display panel, wherein the protection panel is attached to the chassis so as to contact an outer surface of the display panel. The display device according to claim 1, wherein the guide protrusions are provided in a facing positional relationship. The guide protrusion is formed at a corner portion, and a corner-side inner surface of a guide recess of the protection panel formed to have a size that can be loosely fitted to each of the guide protrusions comes into contact with a corner-side outer surface of the guide protrusion. The display device according to claim 1, wherein the protection panel is attached to the chassis as described above. The display device according to claim 1, wherein the protection panel is formed of an acrylic plate, and the chassis is formed of a metal member.

Images