JP2005315901A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device in which a display panel is fixed via an adhesive layer to a supporting substrate and a picture frame does not exist on the periphery of the display panel to make the display panel look attractive in design and the occurrence of peeling and dislodgment of the display panel by display unevenness due to a thermal expansion and external impact is averted. <P>SOLUTION: The display device includes the display panel 10 and the supporting substrate 20 composed of a transparent synthetic resin and the entire surface on one side of the display panel 10 is fixed to the supporting substrate 20 through the adhesive layer 30 which is composed of a transparent liquid adhesive exhibiting elasticity after curing and has a thickness 0.2 to 2.0 mm and preferably elongation 200 to 1,000%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device, and more particularly to a display device in which a display panel is supported on a support substrate made of a transparent synthetic resin. The display panel according to the present invention includes an organic EL display (OELD), plasma display (in addition to a passive matrix liquid crystal display panel represented by TN and STN, an active matrix liquid crystal display panel represented by TFT, and the like. PDP) and the like are included.

  Various display panels including a liquid crystal display panel are finally housed in a synthetic resin or metal panel holder together with peripheral devices such as a control circuit board and a backlight as described in Patent Document 1, for example. Assembled as a display device.

  The fixing method in the panel holder at that time includes a method in which the display panel is housed in the panel holder via an elastic body such as rubber and is fixed by a locking means such as a claw (see, for example, Patent Document 2). In general, a method of arranging a double-sided adhesive tape around the display panel and sticking it to a frame portion around the window formed in the panel holder is adopted.

JP 2000-19529 A JP 2000-137219 A

  By the way, in order to differentiate the display device as a new model, there is always a demand for downsizing and thinning. However, as part of this, it is required to narrow the frame part and expand the display area. Yes.

  However, when using a double-sided pressure-sensitive adhesive tape for fixing the display panel, if the width of the frame portion is narrowed, the fixing force becomes weak and the film is peeled off relatively easily due to impact or the like. In order to prevent this, it is sufficient to use a highly adhesive double-sided adhesive tape in order to compensate for the narrowing of the frame portion. On the other hand, the following problems arise.

  That is, if the display panel is firmly fixed to the panel holder with a highly adhesive double-sided adhesive tape, the difference in thermal expansion coefficient between the panel holder and the display panel can cause a high temperature especially in summer and low temperatures such as winter. Distortion occurs in the display panel, which may cause display unevenness.

  In addition, according to the fixing method using a locking means such as a nail as an alternative method, such a problem due to the coefficient of thermal expansion hardly occurs, but the nail and the receiver are formed on both the display panel and the panel holder. Therefore, the processing cost increases accordingly, which is not preferable. In addition, as a problem before that, it is difficult to secure a place for disposing the locking means in a situation where the space is cut to the limit in order to realize a reduction in size and thickness.

  Accordingly, an object of the present invention is to provide a display device that does not have a frame around the display panel and looks good in design, and that does not cause display unevenness due to thermal expansion coefficient or peeling or dropping of the display panel due to external impact. Is to provide.

  In order to solve the above problems, the present invention includes a display panel and a support substrate made of a transparent synthetic resin, and the entire surface of one surface of the display panel is made of a transparent liquid adhesive that exhibits elasticity after curing. It is characterized by being fixed to the support substrate through an adhesive layer having a thickness of 0.2 to 2.0 mm.

  In the present invention, in order to effectively prevent the occurrence of display unevenness due to the difference in thermal expansion coefficient between the display panel and the support substrate, the elongation percentage of the adhesive layer is preferably 200 to 1000%.

  The present invention includes an aspect in which the support substrate is generally larger than the display panel. According to a preferred aspect of the present invention, the display panel is formed on one side thereof for connecting an external drive circuit board. The support substrate is rectangular, and the three sides excluding the specific side facing the terminal unit substantially overlap the outer shape of the liquid crystal display panel, and only the specific side is outside the terminal unit. It is formed to protrude.

  In addition, when the display panel is fixed to the support substrate via the adhesive layer, the height of the liquid adhesive is cured in a non-display area in one surface of the display panel. It is preferable to arrange a plurality of 0 mm columns.

  Further, in order to suppress the amount of protrusion of the liquid adhesive as much as possible, it is preferable to form a groove along the outer shape of the display panel on the side of the support substrate facing the display panel.

  The support substrate may be arranged on either the display observation surface side or the counter-display observation surface side (back side) of the display panel, but is arranged on the display observation surface side to protect the display observation surface. Is preferred.

  According to the present invention, since the display panel is fixed to the transparent synthetic resin support substrate, a display device having a neat and clean design with no frame can be obtained. Further, the thickness of the adhesive layer for fixing the display panel to the support substrate is 0.2 to 2.0 mm, and preferably the expansion rate is 200 to 1000%, so that the thermal expansion coefficient of the display panel and the support substrate can be reduced. Generation of display unevenness due to the difference is effectively prevented.

  Further, when the display panel is fixed to the support substrate via the adhesive layer, the height obtained by curing the liquid adhesive in the non-display area in the surface of the display panel facing the support substrate is 0.2-2. By arranging a plurality of 0 mm columns, the distance between the display panel and the support substrate can be kept substantially uniform.

  Furthermore, by forming a groove along the outer shape of the display panel on the side of the support substrate facing the display panel, the amount of the liquid adhesive protruding can be minimized. Further, by disposing the support substrate on the display observation surface side of the display panel, it is possible to eliminate the conventional surface treatment such as scratch-preventing transparent protective film and transparent protective resin, and hard coat treatment. .

  First, a basic embodiment (first example) of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited to this. 1 is an exploded perspective view showing a display device according to the present invention, FIG. 2 is a front view of the display device, and FIG. 3 is a sectional view taken along line AA.

  The display device includes a display panel 10 and a support substrate 20. In the first embodiment, the display panel 10 is a liquid crystal display panel including two panel substrates (transparent electrode substrates) 11 and 12 arranged opposite to each other with a liquid crystal layer (not shown) such as TN liquid crystal or STN liquid crystal interposed therebetween. is there.

  The material of the panel substrates 11 and 12 is a glass material, but may be a synthetic resin material. In the first embodiment, when one panel substrate 11 is on the display observation surface side and the other panel substrate 12 is on the non-display observation surface side (rear surface side) and is a transmissive type or a transflective type, the panel substrate 12 is used. A backlight (not shown) is arranged on the side.

  In the present invention, the display panel 10 is a one-way take-out type having one terminal portion, and in the first embodiment, the terminal portion 11a is provided on the panel substrate 11 side, but is provided on the panel substrate 12 side. Also good. The outer shape of the display panel 10 also includes a terminal portion 11a. Note that a flexible substrate (not shown) such as a COF (chip on film) or a TCP (tape carrier package) is connected to the terminal portion 11a as an external drive circuit substrate.

  Polarizers 13 and 13 are attached to both surfaces of the display panel 10. The portion where the polarizing plate 13 is attached is a display region 13a where a transparent electrode (not shown) is formed, and the surrounding portion does not contribute to the display where the lead-out wiring of the transparent electrode and the peripheral sealing material are formed. This is the display area 13b.

  In the present invention, the support substrate 20 is made of a transparent synthetic resin. In this first embodiment, an acrylic resin plate having a thickness of 2 mm is used. Transparent means that the back side can be seen through from the front and the transparent liquid adhesive described below can be colored or not.

  As shown in FIG. One surface of the display panel 10 is fixed to the support substrate 20 via an adhesive layer 30. The adhesive layer 30 is made of a transparent liquid adhesive that exhibits elasticity after curing. An example of this type of liquid adhesive is SE1740A / B manufactured by Toray Dow Corning.

  The adhesive layer 30 is provided over the entire facing surface of the display panel 10 and the support substrate 20. In this case, the thickness of the adhesive layer 30 is set to 0.2 in order to reduce display warpage, undulation, and internal stress due to the difference in thermal expansion coefficient between the display panel 10 and the support substrate 20 to thereby eliminate display unevenness. ˜2.0 mm.

  Moreover, it is preferable that the elongation rate of the contact bonding layer 30 is 200 to 1000%. This elongation is measured by the method described in JIS C-2123 “Testing Method for Silicone Compound for Electrical Use” and JIS K-6301 “Physical Test Method for Vulcanized Rubber”. It is a ratio of the maximum elongation length at the time of breaking to the length of the test piece at the time of no load when it is pulled until breaking at a speed of 500 ± 25 mm / min.

  The support substrate 20 may be arranged on either the panel substrate 11 on the display observation surface side of the display panel 10 or the panel substrate 12 on the back surface side of the display panel 10, but this first implementation is to protect the display observation surface from being damaged. As shown in the example, it is preferably arranged on the panel substrate 11 side. According to this, it is possible to eliminate the conventional surface treatment such as scratch-preventing transparent protective film and transparent protective resin, and hard coat treatment.

  In the present invention, the entire support substrate 20 may be larger than the display panel 10, but in order to have a clean design without a frame, the support substrate 20 is preferably sized as follows.

  That is, the three sides 20b to 20d excluding the specific side 20a facing the terminal portion 11a of the support substrate 20 are substantially overlapped with the outer shape of the display panel 10 (the corresponding three sides), and only on the specific side 20a side. A tongue piece 21 protruding outward from the terminal portion 11a is formed.

  The tongue piece 21 is used as a support leg when the display device is installed on, for example, a dashboard of an automobile. If a backlight is required, it is fixed to the tongue piece 21 with a screw or the like. In the first embodiment, the protruding length of the tongue piece 21 is 30 mm, but may be arbitrarily determined according to the use of the display device. Unlike the first embodiment, the tongue piece 21 is also provided in the same manner when the support substrate 20 is disposed on the panel substrate 12 side on the back surface side having no terminal portion.

  Next, another embodiment (second example) included in the present invention will be described with reference to FIGS. 4 and 5. 4 is a perspective view showing the display panel 10 opposite to that of FIG. 1, that is, with the panel substrate 11 on the display observation surface side facing up, and FIG. 5 shows the display panel 10 on the support substrate 20 via the adhesive layer 30. It is a principal part expanded sectional view of the state fixed.

  Also in the second embodiment, if the panel substrate 11 side on the display observation surface side is fixed to the support substrate 20 via the adhesive layer 30, the display panel 10 is placed in the non-display area 13b of the panel substrate 11 in advance, for example. The support | pillar 31 which maintains the space | interval between the support substrate 20 substantially uniformly is provided in several places.

  The column 31 is preferably formed by curing a liquid adhesive (transparent liquid adhesive that exhibits elasticity after curing), which is the same adhesive as the adhesive layer 30, and the height thereof is substantially the same as the adhesive layer 30. Is done. That is, it is appropriately selected within the range of 0.2 to 2.0 mm according to the thickness of the adhesive layer 30 to be formed. In addition, the support | pillar 31 may be formed in the support substrate 20 side, and the shape may be arbitrary, such as a cylinder and a prism.

  In any case, the display panel 10 and the support substrate 20 are filled by filling the gap between the display panel 10 and the support substrate 20 after the support 31 is cured and the support 31 is used as a spacer. The display panel 10 can be fixed to the support substrate 20 with a substantially uniform spacing therebetween.

  Next, with reference to FIG. 6 and FIG. 7, another embodiment (third example) included in the present invention will be described. FIG. 6 is a cross-sectional view of the display device taken along line BB in FIG. 2, and FIG.

  In the third embodiment, a groove 22 is formed along the outer shape of the display panel 10 on the surface of the support substrate 20 facing the display panel 10. That is, when the support substrate 20 is disposed on the panel substrate 11 side having the terminal portion 11a as in the first embodiment, the grooves 22 are formed along the four sides including the side of the terminal portion 11a. .

  Further, when the support substrate 20 is disposed on the panel substrate 12 side without the terminal portion, the grooves 22 are formed along the four sides of the panel substrate 12. The grooves 22 are preferably formed as a series of annular grooves at positions slightly inside the sides of the display panel 10.

  The groove shape may be a V-shaped groove, a U-shaped groove, or the like, and the depth may be appropriately designed according to the thickness of the adhesive layer 30 or the viscosity of the liquid resin, but as an example, the thickness of the adhesive layer 30 In the case of 1 mm, the protrusion of the liquid resin can be almost eliminated by setting the depth of the groove 22 to 0.5 mm.

  In the above example, a liquid crystal display panel to which a polarizing plate is attached is used as the display panel, but the present invention can also transmit light when no voltage is applied, for example, to see the background. A transparent display body that can realize a transparent display that can scatter light at the time of application and can see characters and figures without using a polarizing plate can also be used as a display panel. In this case, in combination with a support substrate made of a transparent synthetic resin, the display device is further suitable as a display device capable of displaying with transparency.

  Further, when the transparent display body is incorporated and used in the display device of the present invention, it is transparent when no voltage is applied, and its presence itself can be less annoying or give a feeling of pressure. It is suitable for installation on a dashboard or the like.

1 is an exploded perspective view showing a display device according to a first embodiment of the present invention. The front view of the said display apparatus. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. The perspective view which shows the display panel contained in 2nd Embodiment of this invention. The principal part expanded sectional view of the said 2nd Embodiment. Sectional drawing which shows the display apparatus which concerns on 3rd Embodiment of this invention. The principal part expanded sectional view of the said 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display panel 11,12 Panel board | substrate 11a Terminal part 13 Polarizing plate 13a Display area 13b Non-display area 20 Supporting substrate 21 Tongue piece 22 Groove 30 Adhesive layer 31 Post

Claims (6)

  An adhesive having a thickness of 0.2 to 2.0 mm made of a transparent liquid adhesive that includes a display panel and a support substrate made of a transparent synthetic resin, and one surface of the display panel exhibits elasticity after curing. A display device, wherein the display device is fixed to the support substrate via a layer.   The display device according to claim 1, wherein an elongation percentage of the adhesive layer is 200 to 1000%.   The display panel includes a terminal portion formed on one side for connection to an external drive circuit board, and the support substrate is rectangular, and three sides excluding a specific side facing the terminal portion are the liquid crystal display. 3. The display device according to claim 1, wherein the display device is formed so as to substantially overlap an outer shape of the panel and to protrude only to the outside of the terminal portion.   4. A plurality of struts having a height of 0.2 to 2.0 mm formed by curing the liquid adhesive are arranged in a non-display area in one surface of the display panel. The display device described in 1.   5. The display device according to claim 1, wherein a groove is formed along an outer shape of the display panel on a side of the support substrate facing the display panel.   The display device according to claim 1, wherein the support substrate is disposed on a display observation surface side of the display panel.

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