JP2010224081A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability by making it more difficult for a front panel stuck on a touch panel to come off than before. <P>SOLUTION: A display device includes a display panel including a first substrate and a second substrate, a touch panel disposed on the substrate on the viewer side of the display panel, and a front panel fixed on the touch panel. The front panel has a plane size larger than the touch panel and has an opaque region in a periphery thereof and has an adhesive applied to a boundary part between the opaque region of the front panel and sidewalls of the touch panel. The adhesive is colored in a color similar to the color of the opaque region in the periphery of the front panel. The color of the opaque region in the periphery of the front panel and the color of the adhesive are of the same color. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device including a display panel, a touch panel disposed on a surface of the display panel, and a front panel.

A TFT (Thin Film Transistor) type liquid crystal display device (also referred to as a liquid crystal display module) having a small liquid crystal display panel with a subpixel number of about 240 × 320 × 3 in color display is used for display of portable devices such as mobile phones. Widely used as a part.
In recent years, touch screen technology supporting a “human friendly” graphical user interface has become important in the spread of mobile devices. A liquid crystal display device with a touch panel that performs an operation corresponding to a menu by attaching a touch panel substrate to the surface of the liquid crystal display panel and touching a menu screen displayed on the liquid crystal display panel with a finger is also known. (See Patent Document 1 below)
On the other hand, in a liquid crystal display device, a structure in which a front panel is fixed to a polarizing plate on the viewer side of a liquid crystal display panel via an adhesive having a refractive index equivalent to that of the polarizing plate (hereinafter referred to as a hybrid panel structure). Things are known. Compared with the structure in which the front panel is disposed on the polarizing plate on the viewer side of the liquid crystal display panel via the gap layer, this hybrid panel structure is (1) dust-free (contamination of foreign matter is less), ( 2) Thinning, (3) Good outdoor visibility, and (4) High luminance rate.

  As prior art documents related to the invention of the present application, there are the following.

JP 2006-146895 A

In recent years, liquid crystal display devices with a touch panel having a hybrid panel structure in which a front panel is bonded to a touch panel have been commercialized. However, in the case of a liquid crystal display device with a touch panel having a hybrid panel structure, there is a problem that the front panel attached on the touch panel is easily peeled off by an external force.
In addition, a front panel is known in which an opaque region is formed by printing or the like on the periphery of four sides on the back side. However, the opaque area of the front panel is weak against mechanical external force, and the opaque area is easily scratched and scraped by handling or contact with jigs, and the spot is pinpointed to cause light leakage or print damage. There is a problem that it may be seen as (appearance defect).
The above-mentioned two problems (the former is reliability and the latter is mass-productive) are major issues in producing a liquid crystal display device with a touch panel having a hybrid panel structure.

The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide a display device with a touch panel having a hybrid panel structure, in which a front panel attached on a touch panel is more than conventional. An object of the present invention is to provide a technique that makes it difficult to peel off and can improve reliability.
Another object of the present invention is to provide a display device with a touch panel having a hybrid panel structure, and even if the opaque region of the front panel pasted on the touch panel is scratched, the scratch is difficult to see and is mass-productive. It is to provide a technique that can improve the quality.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
(1) A display device including a display panel, a touch panel disposed on a viewer-side surface of the display panel, and a front panel fixed on the touch panel, the front panel having a planar size Is larger than the touch panel and has an opaque region in the periphery, and an adhesive is applied to at least a part of the boundary between the opaque region of the front panel and the side wall of the touch panel. The front panel is colored with a color similar to the color of the opaque region around the front panel.
(2) A display device including a display panel, a touch panel disposed on a viewer-side surface of the display panel, and a front panel fixed on the touch panel, the front panel having a planar size Is larger than the touch panel, has an opaque region in the periphery, and an adhesive is applied to the boundary between the opaque region of the front panel and the side wall of the touch panel.
(3) In (2), the adhesive is colored with a color similar to the color of the opaque region in the peripheral portion of the front panel.
(4) In (1) or (3), the color of the opaque region in the periphery of the front panel and the color of the adhesive are the same color.
(5) In (4), the color of the opaque region around the front panel and the color of the adhesive are black.

(6) A display device including a display panel, a touch panel disposed on a viewer-side surface of the display panel, and a front panel fixed on the touch panel, the front panel having a planar size Is larger than the touch panel and has an opaque region in the periphery, a transparent region is formed in a predetermined pattern in the opaque region of the front panel, and the opaque region of the front panel and the touch panel An adhesive material is applied to at least a part of the boundary with the side wall, and the adhesive material is applied so as to cover the transparent region in the opaque region in the peripheral portion of the front panel.
(7) In (6), the color of the adhesive is different from the color of the opaque region in the peripheral portion of the front panel.
(8) In (7), the transparent area in the opaque area in the peripheral part of the front panel represents a predetermined pattern or character.
(9) In any one of (1) to (8), the adhesive is applied so as to cover the opaque region in the peripheral portion of the front panel and a part of the side wall of the touch panel.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
(1) According to the present invention, in a display device with a touch panel having a hybrid panel structure, it is possible to improve the reliability by making the front panel attached on the touch panel harder to peel than before.
(2) According to the present invention, in a display device with a touch panel having a hybrid panel structure, even if the opaque region of the front panel pasted on the touch panel is scratched, it is difficult to see the scratch and mass productivity is improved. It becomes possible to improve.

It is a figure for demonstrating the liquid crystal display device with a touch panel of the hybrid panel structure used as the premise of this invention. It is a figure for demonstrating the front panel shown in FIG. It is principal part sectional drawing for demonstrating the problem of the liquid crystal display device with a touch panel of the hybrid panel structure used as the premise of this invention. It is principal part sectional drawing for demonstrating the liquid crystal display device with a touch panel of the hybrid panel structure of Example 1 of this invention. It is sectional drawing for demonstrating the other example of the liquid crystal display device with a touch panel of the hybrid panel structure of Example 2 of this invention. It is sectional drawing for demonstrating the other example of the liquid crystal display device with a touch panel of the hybrid panel structure used as the premise of this invention.

Hereinafter, embodiments in which the present invention is applied to a liquid crystal display device will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
[Liquid Crystal Display as a Premise of the Present Invention]
FIG. 1 is a diagram for explaining a liquid crystal display device with a touch panel having a hybrid panel structure as a premise of the present invention.
FIG. 1A is a plan view for explaining a liquid crystal display panel of a liquid crystal display device with a touch panel having a hybrid panel structure as a premise of the present invention. SUB1 is a first substrate, SUB2 is a second substrate, and DRV is The semiconductor chip and FPC are flexible substrates.
A liquid crystal display device with a touch panel having a hybrid panel structure as a premise of the present invention includes a liquid crystal display panel and a backlight for illuminating the liquid crystal display panel.
Although the illustration of the backlight is omitted, the backlight generally includes a light guide plate, a white light emitting diode (LED) serving as a light source, a reflective sheet disposed on the lower surface side of the light guide plate, and an upper surface side of the light guide plate. And an optical sheet group disposed in the mold.
The liquid crystal display panel includes a first substrate (SUB1), a second substrate (SUB2), a liquid crystal layer (not shown) sandwiched between the first substrate (SUB1) and the second substrate (SUB2), An upper polarizing plate (POL2) attached to the upper surface (display surface) of the second substrate (SUB2) and a lower polarizing plate (POL1) attached to the lower surface (backlight side surface) of the first substrate (SUB1). ). In the liquid crystal display panel, the peripheral portions of the four sides of the first substrate (SUB1) are fixed to the mold with a double-sided tape, and are arranged on the mold.
A semiconductor chip (DRV) that constitutes a driver or the like is mounted on the first substrate (SUB1).

As the first and second substrates (SUB1, SUB2), for example, transparent insulating substrates such as glass are used.
Each of the first and second substrates (SUB1, SUB2) is formed in a rectangular planar shape having four corners. In this embodiment, for example, a rectangular planar shape having a long side and a short side It is formed with. Of the first and second substrates (SUB1, SUB2), the long side of the first substrate (SUB1) is longer than the long side of the second substrate (SUB2), and the first substrate (SUB1) is the second substrate (SUB2). And a region that does not overlap (hereinafter referred to as a non-overlapping region). The semiconductor chip (DRV) is mounted in a non-overlapping region on the surface of the first substrate (SUB1) on the liquid crystal layer side.
Thin film transistors, pixel electrodes, and the like are formed on the first substrate (SUB1), and color filters and the like are formed on the second substrate (SUB2). Here, since the liquid crystal display panel (LCD) of this embodiment is an IPS liquid crystal display panel, the counter electrode is provided on the first substrate (SUB1) side, but the TN liquid crystal display panel or the VA liquid crystal display panel. In this case, the counter electrode is provided on the second substrate (SUB2) side.

FIG.1 (b) is a top view which shows the state which mounted the touchscreen 30 on the liquid crystal display panel shown to Fig.1 (a). In FIG. 1B, FPCT is a flexible substrate for a touch panel.
FIG.1 (c) is a top view which shows the state which mounted the front panel (it is also called a front window) 11 on the touch panel shown in FIG.1 (b). Moreover, FIG.1 (d) is principal part sectional drawing which shows the cross-section along the AA 'line of FIG.1 (c).
As shown in FIG. 1D, in the liquid crystal display device with a touch panel having a hybrid panel structure as a premise of the present invention, the touch panel 30 is placed on the upper polarizing plate (POL2) on the second substrate (SUB2) of the liquid crystal display panel. Further, it is bonded and fixed through an adhesive 9 having a refractive index equivalent to that of the polarizing plate (POL2). The front panel 11 is bonded and fixed on the touch panel 30 via an adhesive 19.
As shown in FIG. 1C, the front panel 11 has a larger planar size than the touch panel 30. As shown in FIG. 2, an opaque region 11 </ b> A is formed by printing or the like on the periphery of the four sides of the front panel 11 on the back surface (the surface opposite to the surface on the observer side). FIG. 2 is a view for explaining the front panel 11 shown in FIG.
As shown in FIG. 1 (d), the periphery of the four sides of the upper polarizing plate (POL 2) is covered with an opaque region 11 A on the periphery of the four sides of the front panel 11. A region other than the opaque region 11A around the four sides of the front panel 11 is a display region.

FIG. 3 is a cross-sectional view of an essential part for explaining the problems of the liquid crystal display device with a touch panel having a hybrid panel structure which is a premise of the present invention, and is a view showing again FIG.
As described above, in the case of a liquid crystal display device with a touch panel having a hybrid panel structure, the front panel 11 is bonded onto the touch panel 30 via the adhesive 19. However, the front panel 11 attached on the touch panel 30 has a problem that it is easily peeled off by the external force F.
In addition, the opaque region 11A by printing or the like on the periphery of the four sides of the front panel 11 is weak against mechanical external force, and the opaque region portion is easily scratched and scraped by handling and contact with jigs. There was a problem that the spot was pinpointed and could be seen as light leakage or printing scratches (poor appearance).

[Example 1]
The basic structure of the liquid crystal display device with a touch panel having a hybrid panel structure according to the first embodiment of the present invention is the same as the liquid crystal display device with a touch panel having a hybrid panel structure shown in FIG.
FIG. 4 is a main part sectional view for explaining a liquid crystal display device with a touch panel having a hybrid panel structure according to the present embodiment, and is a main part sectional view showing a sectional structure at the same position as FIG.
This embodiment is characterized in that an adhesive 20 is applied to the boundary between the opaque region 11A of the front panel 11 and the side wall of the touch panel 30 for the purpose of reinforcement. Here, the adhesive 20 may be applied to all boundaries between the opaque region 11A of the front panel 11 and the side wall of the touch panel 30, or at least one of the opaque region 11A of the front panel 11 and the side wall of the touch panel 30. It may be applied to the part.
Further, the adhesive 20 is colored with a color similar to the color of the opaque region 11 </ b> A around the front panel 11. In the present embodiment, since the color of the opaque region 11A in the peripheral portion of the front panel 11 is black, the adhesive 20 is colored black. Therefore, when the opaque region 11A of the front panel 11 is other than black, for example, red, the adhesive 20 is colored red or a similar color.

According to the present embodiment, even if an external force (F in FIG. 3) that causes the front panel 11 and the touch panel 20 to be separated due to mechanical impact or the like is generated, the opaque region 11A of the front panel 11 and the touch panel Since the adhesive 20 is applied to the boundary with the side wall 30 for the purpose of reinforcement, the front panel 11 attached on the touch panel 20 is less likely to be peeled off than before and the reliability can be improved. It becomes possible.
Furthermore, since the adhesive 20 is colored with a color similar to the color of the opaque region 11A in the peripheral portion of the front panel 11, the color of the adhesive 20 to be used is the same as the previous process (adhesive 20). Since the scratches and peeling of the opaque region 11A around the front panel 11 that has been created in step 1) can be made invisible, the front panel 11 pasted on the touch panel 20 can be made invisible. Even if the opaque region is scratched, the scratch can be made difficult to see and the mass productivity can be improved.

[Example 2]
FIG. 6 is a cross-sectional view for explaining another example of a liquid crystal display device with a touch panel having a hybrid panel structure, which is a premise of the present invention, and is a cross-sectional view of a main part showing a cross-sectional structure at the same position as FIG. It is.
In the example shown in FIG. 6A, a transparent region having a predetermined pattern is formed in the opaque region 11A around the front panel 11, and the transparent region is filled with a coloring member 21 having a color different from that of the opaque region 11A. It is what I did. Thereby, when it sees from the front of the front panel 11, a predetermined pattern or a character can be expressed.
In the example of FIG. 6, a circle pattern is represented as shown in FIG. In addition, FIG.6 (b) is the figure which looked at the part shown by A of Fig.6 (a) from the observer side.
FIG. 5 is a cross-sectional view for explaining another example of a liquid crystal display device with a touch panel having a hybrid panel structure according to a second embodiment of the present invention. FIG.
In this embodiment, the above-described coloring member 21 is also used as the above-described reinforcing adhesive 20. Thereby, in this embodiment, since the separate colored member 21 is not prepared, the cost can be reduced when a predetermined pattern is displayed in the opaque region 11A in the peripheral portion of the front panel 11.

In the present embodiment, as in the above-described embodiment, the adhesive material 20 that also serves as a coloring member may be applied to all the boundary portions between the opaque region 11A of the front panel 11 and the side wall of the touch panel 30, or the front panel 11. The opaque region 11A and the side wall of the touch panel 30 may be applied to at least a part.
In addition, as the touch panel 30 of each above-mentioned Example, the electrostatic coupling type touch panel (For example, what formed X, Y electrode on transparent insulating substrates, such as glass), can be used.
Further, in each of the above-described embodiments, the embodiment in which the present invention is applied to the liquid crystal display device has been described. However, the present invention is not limited to this, and other organic EL display panels, inorganic EL display panels, and the like are used. The present invention can be applied to a display module provided with a display panel.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

SUB1 1st substrate SUB2 2nd substrate POL1, POL2 Polarizing plate 9, 19, 20 Adhesive 11 Front panel 11A Opaque region 30 Touch panel

Claims (9)

A display panel;
A touch panel disposed on the viewer-side surface of the display panel;
A display device comprising a front panel fixed on the touch panel,
The front panel has a larger planar size than the touch panel, and has an opaque region in the periphery,
Adhesive is applied to at least a part of the boundary between the opaque region of the front panel and the side wall of the touch panel,
The display device according to claim 1, wherein the adhesive is colored with a color similar to the color of the opaque region in the peripheral portion of the front panel. A display panel;
A touch panel disposed on the viewer-side surface of the display panel;
A display device comprising a front panel fixed on the touch panel,
The front panel has a larger planar size than the touch panel, and has an opaque region in the periphery,
A display device, wherein an adhesive is applied to a boundary portion between an opaque region of the front panel and a side wall of the touch panel.   The display device according to claim 2, wherein the adhesive is colored with a color similar to the color of the opaque region in the peripheral portion of the front panel.   4. The display device according to claim 1, wherein a color of the opaque region in a peripheral portion of the front panel and a color of the adhesive are the same color. 5.   The display device according to claim 4, wherein a color of the opaque region in a peripheral portion of the front panel and a color of the adhesive are black. A display panel;
A touch panel disposed on the viewer-side surface of the display panel;
A display device comprising a front panel fixed on the touch panel,
The front panel has a larger planar size than the touch panel, and has an opaque region in the periphery,
In the opaque region of the front panel, a transparent region is formed in a predetermined pattern,
Adhesive is applied to at least a part of the boundary between the opaque region of the front panel and the side wall of the touch panel,
The display device, wherein the adhesive is applied so as to cover the transparent region in the opaque region in the periphery of the front panel.   The display device according to claim 6, wherein a color of the adhesive is different from a color of the opaque region in a peripheral portion of the front panel.   The display device according to claim 7, wherein the transparent region in the opaque region around the front panel represents a predetermined pattern or a character.   9. The adhesive according to claim 1, wherein the adhesive is applied so as to cover the opaque region in a peripheral portion of the front panel and a part of a side wall of the touch panel. Display device.

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