JP4290469B2 - Dust prevention sheet and display device including the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device such as a liquid crystal display device and a dust prevention sheet that can be used in such a display device. Examples of the liquid crystal display device include those used in personal computers, car navigation systems, and the like, and include touch panel type monitors and electronic pen type monitors.
[0002]
[Prior art]
A conventional example of dust prevention technology in a display device will be described with reference to FIGS. Conventionally, in a product that is assembled by attaching a protective filter or tablet panel to the surface of the liquid crystal unit, a finished product (off-the-shelf product) that has already been assembled as a liquid crystal unit is purchased, and the protective filter or tablet panel is installed on the liquid crystal unit. In some cases, pasting work was performed. Here, the “liquid crystal unit” means a backlight tube 4 as a light source for a backlight or a light guide for a so-called liquid crystal panel 2 as shown in FIG. 16 in an overall perspective view and in a partial sectional view in FIG. This means that the optical plate 6 is combined and stored in a bezel (also referred to as “case”) 7. Further, the “display device” refers to a device in which a protective filter or a tablet panel (hereinafter collectively referred to as “filter”) is attached to the front surface of a display unit such as the liquid crystal unit 1.
[0003]
A state where a filter is attached to a general liquid crystal unit 1 which is an off-the-shelf product to manufacture a display device will be described with reference to FIGS. As shown in FIG. 18, an elastic spacer 10 made of a material such as rubber is attached to the front surface of the liquid crystal unit 1, and a filter 11 is attached to the front surface of the spacer 10. In this way, a display device 50 as shown in FIG. 19 can be obtained.
[0004]
However, in practice, in order to prevent the dust from being trapped inside the filter 11, first, the display surface of the liquid crystal unit 1 is cleaned with a roller 15 as shown in FIG. Perform air cleaning. That is, the dust 17 adhering to the surface is blown away. Thereafter, as shown in FIG. 21, the filter 11 is pasted through the spacer 10. As a result, a display device 50 as shown in FIG. 22 is obtained.
[0005]
In the case where the display device 50 is manufactured by purchasing the already completed liquid crystal unit 1 and applying the filter 11 as described above, after the display device 50 is manufactured, dust 18 from the inside of the bezel 7 as shown in FIG. It was a problem that came out. The dust 18 is hidden in the liquid crystal unit 1 from the beginning or blown off during air cleaning and enters the gap 100. Such dust 18 emerges from the gap 100 between the bezel 7 and the liquid crystal panel 2 due to vibration, impact, static electricity, or the like of the display device 50 being transported or handled. The dust 18 coming out of the gap 100 in the display device 50 is a serious problem that the dust 18 enters the space 19 inside the filter 11 and greatly reduces the quality.
[0006]
In order to prevent such dust from coming out, it may be considered that the gap is eliminated by bringing the bezel 7 and the liquid crystal panel 2 into close contact with each other as shown in FIG. If this is done, there is a problem in that the glass surface of the liquid crystal panel 2 is subjected to a load due to slight stress acting on the bezel 7 or dimensional variation between components, and a wavy bleed phenomenon occurs. Further, since the glass surface of the liquid crystal panel 2 cannot be completely fixed to the bezel 7, there is a problem in that the glass surface is scratched or dusted by moving and rubbing against each other during transportation. there were. Therefore, as shown in FIG. 24, the bezel of the liquid crystal unit and the liquid crystal panel cannot be brought into close contact with each other, and the spacer 9 is interposed between the bezel 7 and the liquid crystal panel 2 as shown in FIG. I had no choice but to leave a gap. As a result, as described above, there is a problem that dust hidden inside the liquid crystal unit comes out of the gap due to vibration or impact of transportation or handling.
[0007]
As a related art related to this, an elastic seal made of silicon rubber between a liquid crystal panel and a shield case is disclosed, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-24044 (Patent Document 1), although the purpose is different. A configuration for arranging members has been proposed. However, this requires applying an elastic seal member when manufacturing a liquid crystal unit by combining a liquid crystal panel and a shield case. There was a problem that could not.
[0008]
As another related prior art, as disclosed in JP-A-9-113880 (Patent Document 2), an assembly in which a transparent plate is previously attached to a front surface of a liquid crystal display module module via a packing material is first assembled. There is also a technique of installing and fixing this in the outer case. This requires that both the assembly and the outer case are designed on the assumption that this technology is applied, and it cannot be applied to what has already been completed as a liquid crystal unit in general.
[0009]
[Patent Document 1]
JP-A-8-241044
[Patent Document 2]
Japanese Patent Laid-Open No. 9-113880
[Problems to be solved by the invention]
In the present invention, a dust prevention sheet as a dust blocking technique that can prevent dust from coming out of the gap between the bezel and the liquid crystal panel and can be easily applied to a liquid crystal unit that has already been completed, and It aims at providing a display apparatus provided with.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a dust prevention sheet according to the present invention has the following configuration. First, the dust prevention sheet includes a first surface and a second surface that is the back surface of the first surface. This dust prevention sheet is a sheet extending in a band shape in a certain longitudinal direction. The insertion tip side which is one of the outer edges extending in the longitudinal direction is linear. The first surface has a first adhesive portion for fixing the sheet itself to another member. The second surface has a second adhesive portion for adsorbing dust. The first adhesive portion extends in the longitudinal direction with a first width at a position spaced from the insertion tip side of the first surface. The second adhesive portion has the second width and the second width at a position closer to the insertion tip side than the region corresponding to the back side of the first adhesive portion of the second surface and spaced from the insertion tip side. Extending in the direction. By adopting this configuration, the insertion tip can be inserted into the gap between the bezel and the display panel, bent at the inner end of the bezel, and attached to the bezel by the first adhesive portion. It is possible to effectively block dust without losing. It can also be attached to an off-the-shelf liquid crystal unit. Furthermore, by providing the second adhesive portion, it is possible to fix the dust that has been blown off during air cleaning and has entered the gap 100, and this dust comes out again due to vibration during later use. Can be prevented. Positioning at the time of affixing work is facilitated by having a straight insertion tip side.
[0013]
Preferably, in the above invention, an outer end side is provided as a side facing the insertion tip side, and the outer end side and the first adhesive portion are separated from each other. By adopting this configuration, separation becomes easy at the time of disassembly or filter replacement.
[0014]
Preferably, in the above invention, a release portion extending in the longitudinal direction is provided at a position farther than the second adhesive portion when viewed from the insertion tip side of the second surface. By adopting this configuration, separation becomes easy at the time of disassembly or filter replacement, and work can be performed without applying a large load to the liquid crystal unit.
[0015]
In the above invention, the color is preferably black. By adopting this configuration, it is possible to hide the undesired reflection caused by the end face of the bezel.
[0016]
In order to achieve the above object, a display device according to the present invention includes a display panel having a display surface and a bezel surrounding an outer edge portion of the display panel. The bezel includes a front portion projecting so as to cover a region near the outer edge of the display surface with a gap between the bezel and the display surface. Any one of the above dust prevention sheets is attached to the front portion in a state where the insertion tip is inserted into the gap and the first adhesive portion is attached to the front portion. By adopting this configuration, it is possible to prevent dust from coming out of the gap due to vibration or impact during transportation or use. In addition, since the dust prevention sheet can be easily positioned and pasted, the manufacturing labor as a display device can be reduced. Furthermore, the display device can be easily manufactured by attaching a dust prevention sheet to an off-the-shelf liquid crystal unit.
[0017]
Preferably, in the above invention, a protective filter or a tablet panel is attached to the surface of the front portion via the dust prevention sheet, and when viewed from the front, the dust prevention sheet is outside the protection filter or tablet panel. It is sticking out. By adopting this configuration, the protective filter or tablet panel when replacing the decomposition time and the protective filter or tablet panel easily peeled from the liquid crystal unit.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Prior to the description of the embodiments of the present invention, the dust prevention sheet technology that the inventors have in mind will be described as a prior stage technology leading to the present invention.
[0019]
When the display device 50 is manufactured by purchasing the already completed liquid crystal unit 1 and applying the filter 11, in order to prevent dust from coming out of the bezel 7 after the display device is completed, a “dust prevention sheet” is used. "Was considered. An example of its use will be described with reference to FIGS. 20 and 1 to 3.
[0020]
First, as shown in FIG. 20, the process up to performing roller cleaning and air cleaning on the display surface of the liquid crystal unit 1 is the same as in the prior art. Thereafter, as shown in FIG. 1, the dust prevention sheet 20 is folded and pasted so as to straddle the boundary between the liquid crystal panel 2 and the bezel 7. The filter 11 is attached from above the dust prevention sheet 20 via the spacer 10. As a result, the display device 50 is as shown in FIG. However, it is difficult to position the dust prevention sheet 20 when attaching the dust prevention sheet 20 in this way. In addition, since the pasting operation is performed manually, there is a problem that fingerprints adhere to the surface of the liquid crystal panel 2.
[0021]
The display device 50 has a problem that the dust prevention sheet 20 is peeled off by heat during use as shown in FIG. 3 because the area where the dust prevention sheet 20 is attached to the liquid crystal panel 2 is small. Further, if an attempt is made to secure a sufficient bonding area, there is a problem that the dust prevention sheet 20 is applied to the display area of the liquid crystal panel 2 and the appearance is deteriorated. Moreover, in order to make the shift | offset | difference of the sticking position of the dust prevention sheet | seat 20 inconspicuous, it is necessary to use a transparent sheet, and since it is transparent, it hides that the unwanted reflection by the end surface of the bezel 7 will be conspicuous. could not.
[0022]
Thus, the inventors have taken these problems into consideration and made further improvements and made the present invention. Embodiments of the present invention will be described below.
[0023]
(Embodiment 1)
(Constitution)
With reference to Fig.4 (a)-(c), the dust prevention sheet | seat in Embodiment 1 based on this invention is demonstrated. The dust prevention sheet 21 includes a first surface and a second surface that is the back surface of the first surface. In the present embodiment, the surface on the side shown in FIG. 4 (a) is the first surface, and the surface on the side shown in FIG. 4 (c) is the second surface. In FIG. 4B, the left side in the drawing is the first surface, and the right side in the drawing is the second surface. As shown in FIGS. 4A and 4C, the dust prevention sheet 21 is a sheet extending in a band shape in a certain longitudinal direction. The insertion tip side 25 which is one of the outer edges extending in the longitudinal direction of the dust prevention sheet 21 is linear. As shown to Fig.4 (a), the 1st surface has the non-transferring double-sided tape 22 as a 1st adhesion part for fixing this dust prevention sheet 21 itself with respect to another member. As shown in FIG.4 (c), the 2nd surface has the non-transfer adhesive printing part 23 as a 2nd adhesion part for adsorb | sucking dust.
[0024]
The non-transferring double-sided tape 22 extends in the longitudinal direction of the dust prevention sheet 21 with a constant width as a first width at a position separated from the insertion tip side 25 in the first surface. The non-transfer adhesive printing portion 23 has a second width as a second width at a position closer to the insertion tip side 25 than the region of the second surface that contacts the back side of the non-transfer double-sided tape 22 and spaced from the insertion tip side 25. The dust prevention sheet 21 extends in the longitudinal direction with a constant width. The dust prevention sheet 21 has an outer end side 26 as a side facing the insertion tip side 25.
[0025]
The dust prevention sheet 21 is made of polyethylene terephthalate (hereinafter referred to as “PET”) as a base material. For example, the non-transfer adhesive double-sided tape 22 is attached to a PET film having a thickness of 50 to 125 μm, and the non-transfer adhesive printing portion 23 is printed with a width of, for example, 1 to 2 mm, and cut into a size that matches the desired liquid crystal unit. Can be obtained.
[0026]
More preferably, in the dust prevention sheet 21, a release PET as a release part extending in the longitudinal direction at a position farther than the non-transfer adhesive printing portion 23 when viewed from the insertion tip side 25 in the second surface. A laminate portion 24 is formed.
[0027]
(how to use)
With reference to FIGS. 5-13, the usage method of this dust prevention sheet | seat is demonstrated. As indicated by arrows in FIG. 5, the dust prevention sheet 21 is attached to each of the four sides surrounding the display surface of the liquid crystal unit 1. However, in FIG. 5, the first surface of the dust prevention sheet 21, that is, the surface shown in FIG. Details of this work are shown in FIGS. The dust prevention sheet 21 is inserted into the gap 100 between the bezel 7 of the liquid crystal unit 1 and the liquid crystal panel 2 in the direction indicated by the arrow in FIG. This insertion may be performed until the insertion distal end side 25 hits the inner member, for example, the spacer 9. In FIG. 6, the second surface of the dust prevention sheet 21, that is, the surface shown in FIG. 4C is directed to the right side in the drawing. Next, the dust prevention sheet 21 is bent as shown by an arrow in FIG. FIG. 8 shows an enlarged view of the vicinity of the tip of the dust prevention sheet 21 in this state. Since the bending force acts on the dust prevention sheet 21 in the direction shown by the arrow 71, the non-transfer adhesive printing portion 23 provided on the second surface tends to be displaced in the direction shown by the arrow 72, and the liquid crystal Pressed against the surface of the panel 2. As a result, it sticks to the liquid crystal panel 2. On the other hand, the non-transferring double-sided tape 22 arranged on the first surface is stuck so as to hug the end portion of the bezel 7. Thus, the release PET laminate 24 is disposed outward from the end surface of the bezel 7 to the outside.
[0028]
In the state where the dust prevention sheet 21 is attached in this way, as shown in FIG. 9, roller cleaning by the roller 15 is performed, and air cleaning by the air nozzle 16 is further performed. Large dust is removed by roller cleaning, and minute dust 17 is removed by air cleaning. Of the dust 17 blown off at the time of air cleaning, the dust that has entered the gap 100 adheres to the non-transfer adhesive printing portion 23 and is fixed.
[0029]
As shown in FIGS. 10 and 11, the spacer 10 is overlaid and pasted from above the dust prevention sheet 21, and the filter 11 is further pasted thereon. Thus, as shown in FIG. 12, a display device 51 equipped with the filter 11 can be obtained. FIG. 13 shows an enlarged cross-sectional view of the peripheral edge of the display device 51 in this state.
[0030]
The filter 11 may be a protective filter or a tablet panel. Or if it is a filter-like component, you may have another function.
[0031]
(Action / Effect)
By handling the dust prevention sheet 21 in this embodiment in this way, the dust prevention sheet 21 can be easily used even for ready-made liquid crystal units that have already been completed and distributed. By sticking the dust prevention sheet 21, the gap 100 is closed, so that dust originally present inside the bezel 7 can be prevented from coming out due to vibration during later use. Further, dust blown off at the time of air cleaning and entering the gap 100 is fixed to the non-transfer adhesive printing portion 23, so that it can be prevented from coming out again due to vibration during later use.
[0032]
In addition, when the dust prevention sheet 21 is pasted, if it is inserted until the insertion tip side 25 comes into contact with the dust prevention sheet 21, the dust prevention sheet 21 is naturally positioned at a fixed position, and thus positioning is easy. Since the positioning is easy, the operator can easily perform the pasting operation without touching the liquid crystal panel. Accordingly, it is possible to prevent fingerprints from being attached to the liquid crystal panel.
[0033]
Since the non-transfer adhesive printing portion 23 as the second adhesive portion is located away from the insertion tip side 25, only the insertion tip side 25 abuts on the liquid crystal panel 2 when inserted into the gap 100, and the non-transfer The adhesive printing portion 23 can be smoothly inserted by inserting the adhesive printing portion 23 while keeping the liquid crystal panel 2 from being touched.
[0034]
The dust prevention sheet 21 is attached so as to be folded back at the end of the bezel 7 and does not overlap the display area even in the attached state. Therefore, the dust prevention sheet 21 does not need to be transparent. For example, by setting the color of the dust prevention sheet 21 to black, it is possible to hide the undesired reflection caused by the end face of the bezel 7.
[0035]
In this embodiment, as shown in FIGS. 4C and 11, the non-transferring double-sided tape 22 that is the first adhesive portion is positioned so as to reach the outer end side 26, but the outer end side 26 and the non-transferring double-sided tape 22 may be separated from each other. In this case, it is easy to separate the spacer 10 and the dust prevention sheet 21 when the display device 51 is disassembled or when the filter 11 is replaced.
[0036]
Even if the release PET laminate 24 is not formed, the effect of the present invention can be obtained. However, if the release PET laminate 24 is formed, the release PET laminate 24 is not separated from the spacer 10 when the display device 51 is disassembled or the filter 11 is replaced. It is easy to separate between the prevention sheet 21 and it is convenient. In particular, when the filter 11 is peeled off from the liquid crystal unit 1, the operation can be performed without applying a large load to the liquid crystal unit 1, which is preferable.
[0037]
In the example of the display device shown in FIG. 12, the outer edge of the filter 11 and the outer edge of the dust prevention sheet 21 substantially coincide with each other, but the dust prevention sheet 21 is outside the filter 11 as shown in FIGS. 14 and 15. It is more convenient for the size of the protrusion to easily protrude when the display device 51 is disassembled or when the filter 11 is replaced.
[0038]
(Embodiment 2)
(Constitution)
With reference to FIGS. 12-15, the display apparatus in Embodiment 2 based on this invention is demonstrated. This display device is a display device to which a dust prevention sheet as already described in the first embodiment is attached. In this display device, the outer edge of the filter 11 and the outer edge of the dust prevention sheet 21 may substantially coincide as shown in FIGS. 12 and 13, but the dust prevention sheet 21 as shown in FIGS. Is more preferable to protrude outside the filter 11.
[0039]
As shown in FIGS. 13 and 15, the display device includes a liquid crystal panel 2 as a display panel having a display surface, and a bezel 7 that surrounds the outer edge of the liquid crystal panel 2. The bezel 7 includes a front portion projecting so as to cover a region near the outer edge of the display surface with a gap 100 between the bezel 7 and the display surface. The dust prevention sheet 21 is attached to the front portion of the bezel 7. The dust prevention sheet 21 is in a state in which the insertion tip side 25 is inserted into the gap 100 and the non-transfer double-sided tape 22 as the first adhesive portion is attached to the front portion. The structure of the dust prevention sheet 21 and the affixing operation of the dust prevention sheet 21 when manufacturing the display device are as described in the first embodiment.
[0040]
(Action / Effect)
In the display device in this embodiment, dust can be prevented from coming out of the gap 100 due to vibration or impact during transportation or use. In addition, since the dust prevention sheet can be easily positioned and pasted, the manufacturing labor as a display device can be reduced. Further, since the dust prevention sheet can be easily positioned and pasted, it can be manufactured without causing fingerprint smear. Furthermore, this display device is advantageous in that it can be easily manufactured by attaching a dust prevention sheet to an off-the-shelf liquid crystal unit.
[0041]
In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the dust prevention sheet which can be affixed with respect to a ready-made common liquid crystal unit can be provided. This dust prevention sheet can be inserted into the gap between the bezel and the display panel, bent at the inner end of the bezel, and attached to the bezel by the first adhesive portion. In addition, dust can be effectively blocked. Furthermore, by providing the second adhesive portion, it is possible to fix the dust that has been blown off during air cleaning and has entered the gap, and that this dust will come out again due to vibration during later use. Can be prevented. Positioning at the time of affixing work is facilitated by having a straight insertion tip side.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of assembly of a display device according to a technique which is a reference of the present invention.
FIG. 2 is a cross-sectional view of a display device according to a technique which is a reference of the present invention.
FIG. 3 is a cross-sectional view of a state where the anti-dust sheet of the display device is peeled off according to a technique that is a reference of the present invention.
4A, 4B, and 4C are a front view, a side view, and a back view of a dust prevention sheet according to Embodiment 1 based on the present invention, respectively.
FIG. 5 is a first explanatory view of a method for using a dust prevention sheet according to the first embodiment of the present invention.
FIG. 6 is a second explanatory diagram of a method for using a dust prevention sheet according to the first embodiment of the present invention.
FIG. 7 is a third explanatory view of the method of using the dust prevention sheet in the first embodiment based on the present invention.
FIG. 8 is an enlarged view of a main part of FIG.
FIG. 9 is an explanatory diagram of a cleaning process after adhering a dust prevention sheet according to the first embodiment of the present invention.
FIG. 10 is a first explanatory view of a filter attaching operation after the dust prevention sheet is attached according to the first embodiment of the present invention.
FIG. 11 is a second explanatory view of the filter attaching operation after attaching the dust prevention sheet in the first embodiment based on the present invention.
FIG. 12 is a perspective view of a first example of a display device according to the second embodiment of the present invention.
FIG. 13 is a partial cross-sectional view of a first example of a display device according to Embodiment 2 of the present invention.
FIG. 14 is a perspective view of a second example of the display device according to the second embodiment of the present invention.
FIG. 15 is a partial cross-sectional view of a second example of the display device according to the second embodiment of the present invention.
FIG. 16 is a perspective view of a conventional liquid crystal unit.
FIG. 17 is a partial cross-sectional view of a conventional general liquid crystal unit.
FIG. 18 is a first explanatory view of a filter attaching operation when a display device is manufactured by a conventional technique.
FIG. 19 is a perspective view of a display device manufactured by a conventional technique.
FIG. 20 is an explanatory diagram of a cleaning process when a display device is manufactured according to a conventional technique.
FIG. 21 is a second explanatory diagram of a filter attaching operation when a display device is manufactured according to a conventional technique.
FIG. 22 is a partial cross-sectional view of a display device manufactured by a conventional technique.
FIG. 23 is an explanatory diagram of a phenomenon that has been a problem in a display device manufactured by a conventional technique.
FIG. 24 is a partial cross-sectional view showing an example in which a bezel and a liquid crystal panel are brought into close contact with each other in a display device according to a conventional technique.
[Explanation of symbols]
1 liquid crystal unit, 2 liquid crystal panel, 4 backlight tube, 6 light guide tube, 7 bezel, 8 back plate, 9 spacer (between liquid crystal panel and bezel), 10 spacer (between filter and bezel), 11 Filter, 15 Roller, 16 Air nozzle, 17, 18 Dust, 19 Space, 20, 21 Dust prevention sheet, 22 Non-transferable double-sided tape, 23 Non-transfer adhesive printing part, 24 Release PET laminate part, 25 Insertion tip Side, 26 outer edge side, 50, 51 display device, 71, 72 arrows, 100 gap.

Claims (6)

A sheet that includes a first surface and a second surface that is the back surface of the first surface, and extends in a band shape in a certain longitudinal direction;
The insertion tip side which is one of the outer edges extending in the longitudinal direction is linear,
The first surface has a first adhesive portion for fixing the sheet itself to another member,
The second surface has a second adhesive portion for adsorbing dust,
The first adhesive portion extends in the longitudinal direction with a first width at a position separated from the insertion tip side of the first surface,
The second adhesive portion has the second width and the second width at a position closer to the insertion tip side than the region of the second surface that contacts the back side of the first adhesive portion and spaced from the insertion tip side. Dust prevention sheet extending in the direction.   The dust prevention sheet according to claim 1, wherein the dust prevention sheet has an outer end side as a side facing the insertion tip side, and the outer end side and the first adhesive portion are separated from each other.   The dust prevention sheet according to claim 1 or 2 which has a mold release part extended in the longitudinal direction in a position far from the 2nd adhesion part seeing from said insertion tip side among said 2nd surfaces.   The dust prevention sheet according to any one of claims 1 to 3, wherein the color is black. A display panel having a display surface;
A bezel surrounding the outer edge of the display panel;
The bezel includes a front portion projecting so as to cover a region near the outer edge of the display surface with a gap between the bezel and the display surface,
In the state which the dust prevention sheet in any one of Claim 1 to 4 inserts the said insertion front end into the said clearance gap in the said front part, and the said 1st adhesion part is affixed on the said front part. Installed display device. A protective filter or a tablet panel is attached to the surface of the front portion via the dust prevention sheet, and the dust prevention sheet protrudes outside the protective filter or tablet panel when viewed from the front. 5. The display device according to 5.

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