JP2014074935A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of contrast due to an air space intervening between a display panel and a functional film and deterioration of display quality due to unevenness of the thickness of a resin layer intervening between the display panel and the functional film.SOLUTION: A display device having a functional film stuck on the principal surface of a display panel 1 having a display 10 includes: a plurality of first resin layers 2 formed so as to surround the display 10 between the principal surface and the rear surface of the functional film facing the principal surface, and separating an inner side region 11 from an outer side region 12; and a second resin layer 3 formed over the entire inner region 11. Each first resin layer 2 comprises: an inner side directed to the central part of the inner region 11; an outer side facing the inner side and directed to an outer side region 12; and two sides located at positions where respective end parts of the inner side are respectively connected with respective end parts of the outer side. The respective sides are along lines from the central part of the inner region 11 toward the four corners of the inner region 11.

Description

  The present invention relates to a display device, and particularly to a display device in which a functional film is bonded to a display surface.

  In a display device using a liquid crystal panel or the like, a functional film such as a touch panel may be bonded and integrated on the display surface of the liquid crystal panel. For example, Patent Document 1 describes a liquid crystal display device in which a touch panel is bonded to a liquid crystal panel. In this liquid crystal display device, the liquid crystal panel and the touch panel are bonded together using a frame-shaped double-sided adhesive tape or a sealing material arranged so as to surround the display area of the liquid crystal panel.

  Patent Document 2 describes a liquid crystal display device in which a liquid crystal display and a touch panel are bonded together via a sealing material having a certain thickness, and a transparent gas is sealed between the liquid crystal display and the touch panel. . According to Patent Document 2, bending of the touch panel is suppressed by the gas sealed between the liquid crystal display and the touch panel, and contact between the liquid crystal display and the touch panel is avoided.

  Patent Document 3 describes a display device with a touch panel in which a plurality of glass beads are arranged between the display device and the touch panel. According to Patent Document 3, distortion of the touch panel is suppressed by the glass beads, and contact between the display device and the touch panel is avoided.

  Furthermore, Patent Document 4 describes a method for manufacturing a display device including a step of bonding a liquid crystal display element and a transparent touch switch with a transparent adhesive. In this manufacturing method, a transparent adhesive is applied to the center of the back surface of the transparent touch switch, and the transparent touch switch is reversed, and the back surface of the transparent touch switch to which the transparent adhesive is applied and the surface of the liquid crystal display element are slowly And a step of causing the transparent adhesive to flow between the back surface of the transparent touch switch and the surface of the liquid crystal display element.

JP 2001-356323 A JP 2002-259052 A JP 2007-34736 A Japanese Patent Laid-Open No. 9-274536

  In the liquid crystal display device described in Patent Document 1, since an air layer is formed between the liquid crystal panel and the touch panel, the contrast is reduced by light scattering and reflection by the air layer. Further, since the touch panel is supported only at the peripheral edge thereof, when pressure is applied to the touch panel, the panel bends and comes into contact with the liquid crystal panel, resulting in display unevenness.

  In the display devices described in Patent Document 2 and Patent Document 3, since the entire surface or almost the entire surface of the touch panel is supported by gas or glass beads, bending of the touch panel is suppressed. That is, one of the above-mentioned drawbacks pointed out with respect to the liquid crystal display device described in Patent Document 1 is improved. However, the point that an air layer is interposed between the liquid crystal display or the display device and the touch panel is the same as the liquid crystal display device described in Patent Document 1. Therefore, the defect that the contrast is lowered due to light scattering and reflection by the air layer is not improved.

  In the display device manufactured by the manufacturing method described in Patent Document 4, a transparent adhesive is filled between the liquid crystal display element and the transparent touch switch. That is, since no air layer is formed between the liquid crystal display element and the transparent touch switch, the contrast is not lowered by light scattering or reflection by the air layer. However, the manufacturing method described in Patent Document 4 includes a process of superimposing the back surface of the transparent touch switch to which the transparent adhesive is applied on the surface of the liquid crystal display element, and the back surface of the transparent touch switch and the liquid crystal display. And a step of flowing between the surfaces of the elements. Therefore, the transparent adhesive spreads from the center of the transparent touch switch and the liquid crystal display element toward the end. In this case, the thickness of the transparent adhesive at the center is thicker than that at the end, which affects the display quality. In addition, the transparent adhesive spreading toward the end may protrude to the outside and adhere to the front surface of the transparent touch switch or the back surface of the liquid crystal display element.

  The display device of the present invention is a display device in which a functional film is attached to the main surface of a display panel provided with a display portion. The display device of the present invention is formed between the main surface and the back surface of the functional film facing the main surface so as to surround the display unit, and a plurality of first resin layers that divide the inner region and the outer region And a second resin layer formed over the entire inner region. Each first resin layer includes an inner side facing the center of the inner region, an outer side facing the inner side and facing the outer region, each end of the inner side, and each end of the outer side. And two side edges that are respectively connected to each other. Each side is along a line from the center of the inner region to the four corners of the inner region.

  According to the present invention, the above problem is solved.

It is typical sectional drawing which shows an example of embodiment of the display apparatus of this invention. It is a schematic plan view which shows an example of embodiment of the manufacturing method of the display apparatus of this invention. It is a schematic plan view which shows an example of embodiment of the manufacturing method of the display apparatus of this invention. It is a schematic plan view which shows an example of embodiment of the manufacturing method of the display apparatus of this invention. It is a schematic plan view which shows an example of embodiment of the manufacturing method of the display apparatus of this invention. It is a schematic plan view which shows the other example of embodiment of the manufacturing method of the display apparatus of this invention. It is a schematic plan view which shows the other example of embodiment of the manufacturing method of the display apparatus of this invention. It is a schematic plan view which shows the other example of embodiment of the manufacturing method of the display apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, an example of an embodiment of a method for manufacturing a display device of the present invention will be described, and an example of an embodiment of a display device of the present invention will also be clarified.

  The manufacturing method of the display device of the present invention is a method for manufacturing a display device in which a functional film is attached to a display panel. Specifically, as shown in FIG. 1, a display device 5 in which a functional film 4 is attached to a main surface 1 a of a display panel 1 via a first resin layer 2 and a second resin layer 3 is provided. It is a method for manufacturing, and is characterized in a method of bonding the display panel 1 and the functional film 4 together. Therefore, although embodiment of this invention is described taking the case where the display panel 1 is a liquid crystal panel and the functional film 4 is a touch panel here as an example, the display panel 1 or the functional film 4 is a specific panel or film. It is not limited to.

  First, the liquid crystal panel 1 provided with the display unit 10 on one main surface 1a is prepared. Next, as shown in FIG. 2A, the first resin layer 2 is formed by applying the first resin (transparent adhesive) on the main surface 1a and on the four outer sides of the display unit 10. To do. Specifically, four first resin layers 2 are formed on the outside of the rectangular display unit 10 along each side of the display unit 10. At this time, between the adjacent first resin layers 2, an inner region 11 surrounded by the first resin layers 2 and an outer region 12 outside the first resin layer 2 are separated from the main surface 1a. A communication portion 13 is provided for communication in the in-plane direction. In other words, the inner region 11 provided with the display unit 10 is communicated with the outer region 12 via the communication unit 13.

  In the present embodiment, the four first resin layers 2 are arranged in a frame shape so as to surround the display unit 10, and communication is performed by providing a gap between the adjacent short sides of the first resin layer 2. Part 13 was formed. As a result, in the present embodiment, four communication portions 13 are provided. However, the communication part 13 may be formed simultaneously with the formation of the first resin layer 2, or may be formed after the first resin layer 2 is formed. That is, in the present embodiment, the first resin is applied to the four locations outside the display unit 10 to form the plurality of first resin layers 2. Therefore, the communication part 13 is formed simultaneously with the formation of the first resin layer 2. However, after the first resin is applied in a continuous frame shape to form the single first resin layer 2, the communication portion 13 is formed afterwards by removing a part of the first resin layer 2. It can also be formed.

  Next, the first resin layer 2 is semi-cured by a predetermined method. Specifically, when the first resin is a photo-curable resin such as an ultraviolet curable resin, the first resin layer 2 is semi-cured by irradiating a light beam having a predetermined wavelength. When the first resin is a thermosetting resin, the first resin layer 2 is semi-cured by heating to a predetermined temperature. When the first resin is an anaerobic curable resin, the air is blocked and the first resin layer 2 is semi-cured. But the 1st resin layer 2 can also be formed with the double-sided tape by which the adhesive resin layer was previously provided in both surfaces of the base material. In this case, the first resin layer 2 can be formed by sticking a double-sided tape around the display unit 10. Moreover, when forming the 1st resin layer 2 with a double-sided tape, the said process of semi-hardening the 1st resin layer 2 is unnecessary.

  Next, as shown in FIG. 2B, a second resin (transparent adhesive) for forming the second resin layer 3 (FIG. 1) in the center of the inner region 11 surrounded by the first resin layer 2. Agent) 3a is applied. In other words, the second resin 3 a is applied at a position equidistant from the four communicating portions 13.

  Next, the touch panel 4 (FIG. 1) is superimposed on the main surface 1a of the liquid crystal panel 1 on which the semi-cured first resin layer 2 is formed and the second resin 3a is applied. Then, as shown in FIG. 2C, the second resin 3 a sandwiched between the main surface 1 a of the liquid crystal panel 1 and the back surface of the touch panel 4 facing the main surface 1 a is pressed and the inner region 11 is pressed. Spreads within. Thereafter, the touch panel 4 is further pressed against the liquid crystal panel 1. Then, as shown in FIG. 2D, the second resin 3 a is further pressed and spreads over the entire inner region 11, and further flows into the communication portion 13 and spreads. Thereby, the second resin layer 3 is formed. In FIG. 2C and FIG. 2D, the touch panel 4 is not shown in order to clearly show how the second resin 3a spreads and the second resin layer 3 is formed.

  Here, when the second resin 3 a spreads in the inner region 11, the air existing in the inner region 11 is pushed out toward the communicating portion 13. Furthermore, when the second resin 3 a flows into the communication portion 13 and spreads, the air existing in the inner region 11 is pushed out to the outer region 12 through the communication portion 13. That is, it is avoided that bubbles are mixed in the second resin layer 3 (inner region 11).

  Moreover, the semi-cured first resin layer 2 functions as a spacer that defines the interval between the liquid crystal panel 1 and the touch panel 4. As a result, the distance between the liquid crystal panel 1 and the touch panel 4 is kept constant, and the thickness of the second resin 3a spreading in the inner region 11 and the communication portion 13 becomes uniform. That is, the thickness of the second resin layer 3 is uniform.

  Furthermore, the semi-cured first resin layer 2 also functions as a wall that restricts the protrusion of the second resin 3a. That is, the first resin layer 2 having a certain thickness is disposed around the inner region 11 to which the second resin 3a is applied, and the back surface of the touch panel 4 is spaced from the first resin layer 2. There is no overlap. Therefore, the inner region 11 is substantially a closed space and communicates with the outer region 12 only through the communication portion 13. Accordingly, the second resin 3 a spreading in the inner region 11 does not get over the first resin layer 2 and protrudes into the outer region 12, and the protrusion can occur only in the communication portion 13. For this reason, the protrusion of the second resin 3a can be controlled easily and reliably.

When the second resin layer 3a is formed as described above, the first resin layer 2 and the second resin layer 3 are fully cured by a predetermined method. Specifically, when the first resin and the second resin 3a are photocurable resins such as an ultraviolet curable resin, the resin layers 2 and 3 are fully cured by irradiating with a light beam having a predetermined wavelength. When the first resin and the second resin 3a are thermosetting resins, the resin layers 2 and 3 are fully cured by heating to a predetermined temperature. Further, when the first resin and the second resin 3a are anaerobic curable resins, the air is blocked and the resin layers 2 and 3 are fully cured. Further, when the first resin and the second resin 3a are resins having different properties, each is completely cured by an appropriate method. If at least one of the first resin and the second resin 3a has adhesiveness, the display panel 1 and the touch panel 4 are bonded together by the adhesive force of the resin. That is, in the present invention, it is sufficient that at least one of the first resin and the second resin 3a has adhesiveness.

  Through the above steps, the attachment of the touch panel 4 to the liquid crystal panel 1 is completed. The touch panel 4 attached to the liquid crystal panel 1 as described above is supported on the entire surface by the first resin layer 2 and the second resin layer 3, so that it does not bend even when subjected to pressure. That is obvious. It is also obvious that no air layer is interposed between the liquid crystal panel 1 and the touch panel 4.

(Embodiment 2)
Next, another example of the embodiment of the display device manufacturing method of the present invention will be described. However, the basic configuration of the manufacturing method according to the present embodiment is the same as that of the manufacturing method according to the first embodiment. Therefore, only the differences between the manufacturing method according to the present embodiment and the manufacturing method according to the first embodiment will be described below, and redundant description will be omitted.

  The manufacturing method according to the present embodiment is different from the manufacturing method according to the first embodiment in the form of the first resin layer 2. Specifically, in the manufacturing method according to the first embodiment, four independent first resin layers 2 are formed outside the display unit 10 of the liquid crystal panel 1, whereas in the manufacturing method according to the present embodiment, As shown in FIG. 3A, a single first resin layer 2 is formed outside the display unit 10. Further, the inner region 11 surrounded by the first resin layer 2 is communicated with the outer region 12 through one communication portion 13.

  In the manufacturing method according to this embodiment for forming the first resin layer 2 of the above form, as shown in FIG. 3A, the second resin is located in the inner region 11 and at the position farthest from the communication portion 13. Resin 3a is applied. The second resin 3a applied at such a position is sandwiched between the main surface 1a of the liquid crystal panel 1 and the back surface of the touch panel 4 (not shown), and thus the inner region 11 as in the manufacturing method according to the first embodiment. Spreads within. However, in the manufacturing method according to the first embodiment, the second resin 3a spreads almost radially from the center of the inner region 11 toward the communication portions 13 at the four corners. On the other hand, in the manufacturing method according to the present embodiment, as shown in FIG. 3B, the second resin 3 a is directed from the corner of the inner region 11 having the longest distance to the communication portion 13 toward the communication portion 13. spread. However, such differences are not essential differences. That is, there is no change in that the air existing in the inner region 11 is pushed out toward the communicating portion 13 by spreading the second resin 3 a in the inner region 11. Furthermore, finally, as shown in FIG. 3C, the second resin 3 a spreads over the entire inner region 11, and further flows into the communication part 13 and spreads, so that it exists in the inner region 11. The air is pushed out to the outer region 12 and the second resin layer 3 is formed.

  In the present specification, the embodiment of the present invention has been described by taking the case where the functional film is a touch panel as an example. However, the functional film is made of glass or plastic, and includes all films and panels having a specific function. For example, a parallax barrier other than a touch panel and a display panel are also included in the functional film.

1 Display panel (liquid crystal panel)
2 1st resin layer 3 2nd resin layer 3a 2nd resin 4 Functional film (touch panel)
5 Display device 10 Display unit 11 Inner region 12 Outer region 13 Communication unit

Claims (3)

A display device in which a functional film is attached to the main surface of a display panel provided with a display unit,
A plurality of first resin layers formed between the main surface and the back surface of the functional film opposite to the main surface so as to surround the display portion and dividing an inner region and an outer region, and the inner surface A second resin layer formed over the entire area,
Each of the first resin layers includes an inner side facing the center of the inner region, an outer side facing the inner side and facing the outer region, each end of the inner side, and the outer side. The display device includes two side edges that are located at a position connecting each end of the inner area, and each of the side edges extends along a line from the center of the inner area toward the four corners of the inner area.   The display device according to claim 1, wherein at least one of the first resin layer and the second resin layer has adhesiveness.   The display device according to claim 2, wherein the first resin layer is a double-sided adhesive tape.

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