JP3918188B2 - Display device - Google Patents

Description

[0001]
BACKGROUND 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. In particular, the present invention relates to a display device equipped with a display having a severe installation environment temperature.
[0002]
[Prior art]
As shown in FIG. 8, the display device according to the prior art has a structure in which a liquid crystal panel 111 is covered with a protective panel 112, which has a metal member chassis 113 with respect to the substantially rectangular liquid crystal panel 111. The protective panel 112 made of a transparent or translucent acrylic plate is attached with a certain gap on the upper surface of the liquid crystal panel 111. This protective panel 112 has a structure in which it is attached by support brackets 114 on four sides. Further, the outer peripheral position of the protective panel 112 is provided with a blindfold 115 that is solidly printed in a band shape having a predetermined width.
The support fitting 114 is formed in a right-angle shape, and has a structure in which flanges 116a and 116b for engaging the outer corner portion of the protective panel 112 are provided at the corner portions.
[0003]
Now, an acrylic plate protection panel 112 is attached to the chassis 113, which is a bracket made of a metal member, with a support metal fitting 114. In order to attach the protection panel 112 accurately, as shown in FIG. The protective panel 112 sandwiched between the metal fitting 114 and the chassis 113 is brought into contact with the inner surface of the support metal fitting 114 so that the clearance (117) is eliminated and positioning is performed.
When mounted in this manner, the clearance (117) of the protective panel 112 is eliminated for positioning, and therefore there is no portion that absorbs the thermal expansion displacement of the acrylic plate.
In order to solve this problem, the protection panel 112 taking into account the prevention of thermal deformation of the acrylic plate has a predetermined clearance 118 between the support bracket 114 and the protection panel 112 sandwiched between the chassis 113 as shown in FIG. 9B. By attaching with a thickness, it is possible to prevent deformation due to thermal expansion displacement of the acrylic plate (see, for example, cited document 1).
[0004]
As described above, in addition to the method of providing the clearance 118 of the support metal fitting 114 that supports the protective panel 112, when the protective panel is mounted in the frame, the protective panel is thermally expanded by mounting using the elastic support member. However, there is also one that absorbs the expansion change (see, for example, Patent Document 2).
[0005]
As another technique for preventing deformation of the protective panel, there is a technique for preventing warpage and distortion by providing a display opening and storing a polarizing plate therein (see, for example, cited document 3).
Patent documents include the following. Refer to FIG. 2 on page 3 for JP-A-6-95110, refer to FIG. 1 on page 2 for JP-A-4-362612, and refer to page 3 for JP-A-5-53106. See the figure.
[0006]
[Patent Document 1]
JP-A-6-95110 [Patent Document 2]
JP-A-4-362612 [Patent Document 3]
JP-A-5-53106 [0007]
[Problems to be solved by the invention]
However, the protective panel that protects the liquid crystal panel in the display device described in the prior art uses a resin acrylic plate, and this acrylic plate has a linear expansion coefficient as compared with the metal chassis that forms the periphery. Since it is large, the amount of displacement of both changes greatly depending on the ambient temperature change.
For this reason, if the acrylic plate is fixed to the chassis side by screw fixing or using a support bracket and the acrylic plate is positioned and fixed, as shown in FIG. There is a problem that the panel surface cannot be absorbed and the panel surface is distorted.
In order to avoid this distortion, as shown in FIG. 9B described above, if a clearance is taken into consideration between the support bracket and the protection panel in consideration of the thermal deformation, positioning at the time of assembly cannot be taken. As a result, the clearance becomes loose, which causes a problem in assembling the protective panel.
Generally, the LCD panel has a distance of several millimeters (approximately 2 mm) between the effective display area and the outer frame (chassis). If the protective panel cannot be positioned, the solid display corresponding to the display area is removed. The part (blindfolded part) overlaps the display area or the outer frame part of the liquid crystal display, so that there is a problem that a part of the display area is hidden or a part of the outer frame part of the liquid crystal display is visible. 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 thermal expansion displacement.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a display device according to the present invention is configured as follows.
[0009]
(1) A display device comprising a protective panel formed of a transparent member, and a chassis to which the protective panel is attached from the outside and a liquid crystal display panel is attached from the inside,
The chassis has at least two guide protrusions at the corners to which the protection panel is attached, and the inner side surfaces in the corner direction of the guide recesses of the protection panel formed to have a size that can be loosely fitted to the respective guide protrusions. The protective panel is attached to the chassis so as to be in contact with the outer surface in the corner direction of the guide convex portion.
(2) The display device according to (1), wherein the guide protrusions are provided in an opposing positional relationship.
(3) The display device according to (1) or (2 ), wherein the protective panel is formed of an acrylic plate, and the chassis is formed of a metal member.
[0010]
As described above, when the protective panel is attached to the chassis, the guide convex portion and the guide concave portion are engaged and positioned for assembly. After assembly, the change in expansion of the protection panel is guided by the guide projection, so that the assembly can be performed accurately during assembly. After assembly, the expansion of the protection panel is guided by the guide projection and the clearance of the guide recess By escaping as much as possible, the distortion deformation of the protective panel can be eliminated.
[0011]
DETAILED DESCRIPTION OF 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 protective panel 11 formed of a rectangular acrylic plate formed of a transparent resin member, and a protective panel 11 attached from the outside and a liquid crystal panel 12 attached from the inside. The chassis 13 is made of a metal member.
In the chassis 13, at least two guide convex portions 14 are formed in a part to which the protective panel 11 is attached, and the outer surface of the guide concave portion 15 of the protective panel 11 formed to have a size that can be loosely fitted to the guide convex portions 14. The protective panel 11 is attached to the chassis 13 so as to be in contact with the outer surface of the guide protrusion 14.
[0013]
The protective panel 11 is formed with a blindfold 20 that is solidly printed in a band shape on the outer peripheral edge formed in a rectangular shape, and the inside of the blindfold 20 becomes a display region 21. And it is the structure provided with the guide recessed part 15 which consists of a hole in four sides of this corner.
[0014]
The chassis 13 is formed by embossing a guide convex portion 14 for loosely fitting a guide concave portion 15 provided on the protective panel 11. The guide convex portion 14 is used for positioning the protective panel 11 and serves as a guide when the protective panel 11 is expanded.
[0015]
More specifically, as shown in FIGS. 2 to 4, the guide protrusions 14 are arranged in an opposing positional relationship, and the guide protrusions 14 are as shown in FIG. 4. In addition, four corner-shaped inner surfaces 16 of the guide recesses 15 of the protective panel 11 formed in the corner portions and sized so as to be loosely fitted to the respective guide projections 14 are formed on the corner-direction outer surfaces 17 of the guide projections 14. The protection panel 11 is attached to the chassis 13 so as to come into contact with the chassis, and is engaged and locked by a support metal fitting 18 (see FIG. 2).
[0016]
As shown in FIG. 1, the support fitting 18 is formed in a right-angle shape and has a structure in which flanges 19 a and 19 b that engage the outer corner portions of the protective panel 11 are provided at the corner portions.
[0017]
In order to incorporate the protective panel 11 having such a structure into the chassis 13, as shown in FIG. 4, first, the guide concave portions 15 of the protective panel 11 are respectively provided on the guide convex portions 14 provided on the four sides of the chassis 13. What is necessary is just to position and engage in the state which contact | connected the inner surface 16 in the corner direction.
[0018]
After the engagement and assembly, the liquid crystal panel 12 operates, and generally, when the backlight of the liquid crystal panel 12 generates heat and the temperature of the chassis 13 supporting the liquid crystal panel 12 becomes high, a protective panel formed of an acrylic plate When the temperature of 11 rises, it expands. When the protective panel 11 expands, as shown in FIGS. 5 to 7, the protective panel 11 has the guide concave portion 15 engaged and locked by the guide convex portions 14 at the four side corners due to the expansion of the entire protective panel 11. The guide concave portion 15 moves in the corner direction and absorbs the movement, and the inner surface 17a (see FIG. 7) opposite to the corner is brought into contact with the guide convex portion 14 and locked.
[0019]
【The invention's effect】
As described above, the display device according to the present invention serves as a positioning guide when the protective panel is attached, and functions to absorb the expansion of the protective panel after the attachment. There is an effect that the blind portion of the chassis portion is hidden and distortion due to thermal deformation of the protective 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 the main part with the protective panel attached.
3 is a cross-sectional view taken along the line AA in FIG. 1 showing a support state of the protection panel, the chassis, and the support bracket.
FIG. 4 is an explanatory view showing an engaged state of a corner portion of the protective panel.
FIG. 5 is an explanatory view showing a state when the protective panel is expanded.
6 is a cross-sectional view taken along line BB shown in FIG.
FIG. 7 is an explanatory view showing an expanded state of a corner portion of the protection panel.
FIG. 8 is a schematic exploded perspective view showing a display device in the prior art.
FIG. 9 is a cross-sectional view showing a state of support by a chassis, a protection panel, and a support metal fitting in the prior 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 Corner direction inner side surface 17 Corner direction outer side surface 18 Support metal fitting 19a ridge part 19b ridge part 20 Blindfold part 21 Display area

Claims (3)

A display device comprising a protective panel formed of a transparent member, and a chassis to which the liquid crystal display panel is attached from the inside by attaching the protective panel from the outside,
The chassis has at least two guide protrusions at the corners to which the protection panel is attached, and the inner side surfaces in the corner direction of the guide recesses of the protection panel formed to have a size that can be loosely fitted to the respective guide protrusions. The display device, wherein the protection panel is attached to the chassis so as to be in contact with a corner direction outer surface of the guide convex portion.   The display device according to claim 1, wherein the guide protrusions are provided in a positional relationship facing each other. The display device according to claim 1, wherein the protective panel is formed of an acrylic plate, and the chassis is formed of a metal member.

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