JP6295164B2 - Display device - Google Patents

Description

  The present invention relates to a display device provided with a touch panel.

  Conventionally, there is a display device in which a touch panel is attached to the front surface of a liquid crystal module. In the conventional display device 100 shown in FIG. 9, the touch panel 102 is disposed in front of the liquid crystal module 108 at regular intervals. By touching the touch panel 102, a button or the like displayed on the liquid crystal module 108 can be selected.

  The touch panel 102 includes a cover film 104 and an electrode film 106 on which electrodes are formed. There are two electrode films 106, and one electrode film 106 is formed with an electrode for detecting the X direction and the other electrode film 106 is detected with the Y direction. The electrode film 106 is attached to the cover film 104 with an adhesive layer (not shown).

  In the liquid crystal module 108, the back surface and the edge of the liquid crystal panel 110 are held by the bezel 112, and the bezel 112 is attached to the housing 114. The bezel 112 side from the dotted line A is the non-display area 116, and the opposite side is the display area 118. In consideration of thermal expansion and the like, the bezel 112 does not hold down the display surface of the liquid crystal panel 110 but opens the space 120 to hold the edge of the liquid crystal panel 110. Further, the touch panel 102 is attached to the periphery of the housing 114 via a bracket 122.

  When dust generated in the space 120 between the liquid crystal panel 110 and the bezel 112 moves to the display area 118 of the liquid crystal panel 110, the appearance of the display is impaired. Before the touch panel 102 is attached, it is cleaned by blowing air, but it is difficult to prevent it completely.

  Patent Document 1 discloses that the periphery of the liquid crystal module 108 is surrounded by an elastic material frame. However, even if the periphery of the liquid crystal module 108 is surrounded, there is a space 120 between the liquid crystal panel 110 and the bezel 112 inside the frame, and it is impossible to prevent dust from entering.

JP-A-8-221197 (FIG. 1)

  An object of the present invention is to provide a display device in which dust does not enter between a display means such as a liquid crystal panel and a touch panel.

  The display device of the present invention includes a touch panel, a display unit disposed at a predetermined interval with respect to the touch panel, a bezel that holds the display unit, and a touch panel between the display area and the bezel of the display unit. A foreign matter intrusion prevention member provided between the display means.

  In a space where the touch panel and the display means are spaced apart at a fixed interval, the foreign matter intrusion prevention member prevents dust generated from the bezel from entering the display area of the display means.

  One surface of the touch panel is opposed to the display unit, and the one surface of the touch panel has a step between the display area of the display unit and the bezel to form a convex portion protruding toward the display unit. The distance between the touch panel and the display means is adjusted by the protrusion.

  The foreign matter intrusion prevention member is disposed between the convex portion of the touch panel and the display means. Since the distance between the touch panel and the display unit is reduced by the convex portion, the intrusion path is narrowed, and the thickness of the foreign matter intrusion prevention member can be reduced.

  The foreign matter intrusion preventing member may be arranged so as to close an opening of a space formed by the bezel and the display means. Since the foreign matter intrusion prevention member is disposed so as to directly close the opening of the space formed by the bezel and the display means, it is possible to more reliably prevent the intrusion of dust generated from the bezel.

  The touch panel includes a support substrate having the convex portion. The touch panel can be secured with sufficient rigidity by being supported by the support substrate.

  The touch panel includes the support substrate, an electrode film laminated on the support substrate and provided with electrodes, and a resin cover film laminated on the electrode film. An electrode film is laminated on the support substrate.

  In the present invention, the foreign matter intrusion preventing member is disposed inward of the bezel, and dust can be prevented from entering between the touch panel and the display means. By reducing the distance between the touch panel and the display means by the convex portion, the thickness of the foreign matter intrusion preventing member can be reduced, and foreign matter intrusion can be effectively prevented.

2A and 2B are views of the display device of the present invention, in which FIG. 1A is a cross-sectional view of the entire display device, and FIG. 2B is an enlarged view of the vicinity of the foreign matter intrusion prevention member in FIG. It is a figure which attaches a touch panel to a housing | casing. It is the figure which used resin for the foreign material penetration | invasion prevention member, (a) is sectional drawing of the vicinity with a foreign material penetration | invasion prevention member, (b) is a figure which attaches a touch panel to a housing | casing after dripping resin. It is sectional drawing which shows an L-shaped foreign material penetration | invasion prevention member. (A) is a figure which attaches a touch panel to a housing | casing after attaching a foreign material intrusion prevention member to a bezel, (b) is a figure which attaches a touch panel to a housing | casing after attaching a foreign material intrusion prevention member to the level | step difference of a support substrate. . It is a figure which shows the display apparatus using the linear foreign material penetration | invasion prevention member. It is a figure which shows the display apparatus which comprised the support substrate with the several board. It is a figure which shows the display apparatus which does not use a support substrate. It is a figure which shows the conventional display apparatus.

  The display device of the present invention will be described with reference to the drawings. The X direction in the figure is the width direction of each member, and the Z direction is the thickness direction of each member. Although a liquid crystal panel will be described as the display means, other display means such as an organic EL may be used.

Embodiment 1
A display device 10 illustrated in FIG. 1 includes a housing 12, a liquid crystal module 14 attached to the housing 12, a touch panel 16 attached in front of the liquid crystal module 14, and a foreign object provided between the liquid crystal module 14 and the touch panel 16. An intrusion prevention member 18 is provided.

  The housing 12 and the bracket 38 hold the liquid crystal module 14 and the touch panel 16. The housing 12 and the bracket 38 are formed of a resin such as plastic. A driver IC necessary for the liquid crystal module 14 and the touch panel 16 is also held in the housing 12.

  The liquid crystal module 14 includes a liquid crystal panel 20, a backlight (not shown), and a bezel 22 that holds the liquid crystal panel 20 and the backlight. The liquid crystal panel 20 includes an array substrate, a color filter substrate, and a liquid crystal between the array substrate and the color filter substrate. The liquid crystal panel 20 has a display area 24 inside from the dotted line A, and a non-display area 26 outside.

  The bezel 22 holds the liquid crystal panel 20 and the backlight described above, puts them together, and attaches them to the housing 12. The bezel 22 includes a front bezel and a rear bezel, and holds the back surface and the edge of the liquid crystal panel 20. The cross section of the bezel 22 has a portion bent from the back surface side of the liquid crystal panel 20 to the display surface side to hold the edge of the liquid crystal panel 20, and the facing portion 28 facing the liquid crystal panel 20 is a space with respect to the liquid crystal panel 20. 30. This is because the thermal expansion of the liquid crystal panel 20 is taken into consideration, and the display is not disturbed by pressing the liquid crystal panel 20.

  The touch panel 16 is arranged with a predetermined interval with respect to the liquid crystal panel 20. The touch panel 16 includes a support substrate 32, an electrode film 34 stacked on the support substrate 32, and a cover film 36 stacked on the electrode film 34. A bracket 38 is attached to the periphery of the touch panel 16, and the bracket 38 is attached to the periphery of the housing 12.

  The support substrate 32 is a transparent plate containing glass or a resin such as acrylic or polycarbonate. When glass is used, the strength of the support substrate 32 can be increased. Use of a resin makes it difficult to break and facilitates processing.

  One surface 40 of the support substrate 32 faces the liquid crystal module 14, and the electrode film 34 is laminated on the other surface 42. The peripheral edge of the one surface 40 of the support substrate 32 is a recess 44. A portion other than the concave portion 44 on the one surface 40 is a convex portion 46. The step 48 that becomes the boundary between the concave portion 44 and the convex portion 46 is arranged inward of the bezel 22 in the non-display region 26 of the liquid crystal panel 20. A bracket 38 is attached to the recess 44, and the touch panel 16 is supported. The convex portion 46 faces a part of the display area 24 and the non-display area 26 of the liquid crystal panel 20.

  A bracket 38 supports the touch panel 16 so that the touch panel 16 does not contact the bezel 22. The bracket 38 is not always necessary, and the touch panel 16 may be directly fixed on the bezel 22. The bracket 38 and the bezel 22 protrude above the liquid crystal panel 20 (in the Z direction in the figure). By forming the convex portion 46, the distance between the support substrate 32 and the liquid crystal panel 20 can be reduced. In particular, by adjusting the non-display area 26 and the support substrate 32 in the liquid crystal panel 20 to approach each other, the thickness of the foreign matter intrusion prevention member 18 can be reduced. The distance between the support substrate 32 and the liquid crystal panel 20 is about 500 μm.

  The electrode film 34 is obtained by forming an electrode on a film made of a transparent dielectric material. Examples of the film material include transparent materials such as polyester, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, and polyethylene naphthalate. The thickness is preferably about 20 to 200 μm. The electrode film 34 may be formed of extremely thin glass, and the thickness is preferably about 20 to 200 μm.

  There are two electrode films 34. This is because the electrode film 34 is provided with an electrode for detecting coordinates in the X direction and the electrode film 34 is provided with an electrode for detecting coordinates in the Y direction.

  The electrode is composed of a plurality of electrode units and is made of a conductive material. For example, it is formed by patterning a transparent conductive film such as ITO (indium tin oxide) or ZnO (zinc oxide). Also, using a composite material in which a transparent conductive film is dispersed in a polymer material that functions as a binder, such as ultrafine conductive carbon fibers such as carbon nanotubes, carbon nanowires, carbon nanofibers, and graphite fibrils, or ultrafine conductive fibers made of silver or the like. It may be formed. Examples of the method for forming the transparent conductive thin film include PVD methods such as sputtering, vacuum deposition, and ion plating, CVD, coating, and printing.

  In addition to the transparent conductive film, the electrode may be formed using a conductor wire such as a very thin metal. The line width is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 2 μm or less from the viewpoint of improving visibility. Moreover, it is necessary to ensure a sufficient aperture ratio in order to ensure transparency, and the pitch of each conductor wire pattern is preferably about 100 μm to 1000 μm, for example. Moreover, by forming the conductor wires in a mesh shape, the number of electrical paths is increased, the surface resistance value is lowered, and the risk of disconnection can be reduced. Examples of the method for forming the conductor wire include a printing method using a paste containing conductive fine particles, a method of patterning a metal thin film by photolithography, and the like.

  The support film 32 side of the electrode film 34 is the one surface 50, and the other side is the other surface 52. An electrode is formed on the other surface 52 of the electrode film 34. In addition, on the peripheral portion on the other surface 52 of the electrode film 34, a lead wiring and a connector for electrically connecting the electrode to the driver IC are provided.

  The cover film 36 is laminated on the other surface 52 of the upper electrode film 34. The cover film 36 protects the electrodes. The cover film 36 is made of an acrylic or polyester resin or glass. The thickness of the cover film 36 is about 100 to 2000 μm.

  If glass is used for at least one of the support substrate 32 and the cover film 36, the strength of the touch panel 16 can be increased. If resin is used for both the support substrate 32 and the cover film 36, the touch panel 16 is difficult to break and warpage due to temperature and humidity changes is reduced.

  The periphery of the cover film 36 has a shielding portion (not shown) formed of black ink or the like so that the non-display area 26, the bezel 22, the bracket 38 and the like of the liquid crystal panel 20 are not visible.

  When an electrode is formed on one surface 50 of the electrode film 34, the cover film 36 can be omitted.

  In order to attach the above-described members of the touch panel 16, an adhesive layer is provided between the members. For the adhesive layer, a silicone-based, epoxy-based, or acrylic optical transparent adhesive is used. The thickness of the adhesive layer is, for example, about 10 to 200 μm.

  The foreign matter intrusion prevention member 18 prevents dust generated in the bezel 22 and the vicinity thereof from entering the display area 24 of the liquid crystal panel 20. The foreign matter intrusion prevention member 18 is disposed so as to block between the non-display area 26 of the liquid crystal panel 20 and the convex portion 46 of the support substrate 32. The foreign matter intrusion prevention member 18 is located inward of the display device 10 from the bezel 22 and does not interfere with the display of the liquid crystal panel 20. The non-display area 26 of the liquid crystal panel 20 is very narrow, about 0.5 to 3 mm. Therefore, the width of the foreign substance intrusion preventing member 18 must be very narrow. By providing the convex portion 46 on the touch panel 16 and reducing the distance between the liquid crystal panel 20 and the touch panel 16, the thickness of the foreign matter intrusion prevention member 18 can be reduced and the attachment becomes easy.

  The foreign matter intrusion prevention member 18 is formed of a flexible porous member or an elastic member such as rubber. The porous member is obtained by foaming a material such as urethane, polyethylene, or polypropylene. The porous member or the elastic member can close the space between the liquid crystal panel 20 and the touch panel 16 without applying pressure to the liquid crystal panel 20. The display on the liquid crystal panel 20 is not affected, and dust does not enter the display area.

  The manufacturing method of the display device 10 is (1) manufacturing the liquid crystal module 14 and the touch panel 16 respectively. At that time, the foreign matter intrusion prevention member 18 is attached to the convex portion 46 of the touch panel 16 as shown in FIG. In order to ensure that there is no gap, it is preferable that the thickness of the foreign substance intrusion prevention member 18 is slightly larger than the distance between the liquid crystal panel 20 and the touch panel 16. The foreign matter intrusion prevention member 18 is not fixed to the liquid crystal panel 20 so as not to affect the display of the liquid crystal panel 20.

  Note that the foreign matter intrusion prevention member 18 may be attached to the liquid crystal module 14. Further, the foreign matter intrusion prevention member 18 may be attached to both the liquid crystal module 14 and the touch panel 16. However, in either case, it is not fixed to the non-attached side.

  (2) The liquid crystal module 14 is attached to the housing 12, and then the touch panel 16 is also attached to the housing 12 via the bracket 38. The foreign matter intrusion prevention member 18 is crushed a little to block between the liquid crystal module 14 and the convex portion 46 of the touch panel 16. Since the foreign matter intrusion prevention member 18 is a porous member, unnecessary pressure is not applied to the liquid crystal module 14.

  As described above, according to the present invention, the foreign matter intrusion preventing member 18 is provided inward of the bezel 22, and dust generated in the bezel 22 or in the vicinity thereof does not enter the display area 24 of the liquid crystal panel 20. Dust does not interfere with the display on the liquid crystal panel 20. Although the width of the foreign matter intrusion prevention member 18 may become very narrow, the distance between the liquid crystal panel 20 and the touch panel 16 is made close by the convex portion 46, and the formation and attachment of the narrow foreign matter intrusion prevention member 18 becomes easy. .

Embodiment 2
As shown in the display device 60 of FIG. 3, a foreign matter intrusion preventing member 62 obtained by curing a liquid resin can be used. Examples of the resin include materials such as acrylic, silicone, and urethane. Before the touch panel 16 is attached to the housing 12 via the bracket 38, a liquid resin is dropped and cured so as to make one round of the periphery of the convex portion 46. The resin foreign matter intrusion preventing member 62 can be formed without applying unnecessary pressure to the liquid crystal panel 20. The foreign matter intrusion preventing member 62 is preferably a soft resin. The presence of the convex portion 26 makes it possible to reduce the amount of dropped resin and to easily form the narrow foreign matter intrusion preventing member 62.

  Instead of forming the foreign substance intrusion preventing member 62 on the periphery of the convex portion 46, the foreign matter intrusion preventing member 62 may be formed in the non-display region 26 of the liquid crystal panel 20 that opposes the peripheral edge of the convex portion 46. You may form in both the convex part 46 and the non-display area | region 26 of the liquid crystal panel 20. FIG.

Embodiment 3
As shown in the display device 70 of FIG. 4, the foreign matter intrusion prevention member 72 may block the opening of the space 30 formed by the bezel 22 and the liquid crystal panel 20. As the foreign matter intrusion prevention member 72, a flexible porous member or an elastic member such as rubber is used. A foreign matter intrusion preventing member 72 is disposed from the upper part of the bezel 22 to the non-display area 26 of the liquid crystal panel 20, and the foreign matter intrusion preventing member 72 has an L-shaped cross section. One end of the foreign matter intrusion preventing member 72 is in contact with the liquid crystal panel 20 and directly covers the space 30 formed by the bezel 22 and the liquid crystal panel 20. The foreign matter intrusion prevention member 72 prevents dust generated in the bezel 22 from coming out of the space 30.

  There are two methods for attaching the foreign matter intrusion prevention member 72 as follows. As shown in FIG. 5A, the foreign matter intrusion prevention member 72 is attached to the upper part of the bezel 22. At that time, a part of the foreign matter intrusion prevention member 72 is projected from the upper part of the bezel 22 in a direction in which the liquid crystal panel 20 is located. When the touch panel 16 is attached, the convex portion 46 of the touch panel 16 presses the protruding portion of the foreign matter intrusion preventing member 72 and bends it downward so that one end of the foreign matter intrusion preventing member 72 contacts the liquid crystal panel 20.

  Further, as shown in FIG. 5B, when the foreign matter intrusion preventing member 72 is attached with an adhesive or the like along the step 48 of the support substrate 32 and the touch panel 16 is attached to the housing 12 via the bracket 38, the foreign matter is removed. One end of the intrusion prevention member 72 may be in contact with the liquid crystal panel 20.

  In either method of FIGS. 5A and 5B, it is preferable that the foreign matter intrusion prevention member 72 is made slightly longer than being in contact with the liquid crystal panel 20. The foreign matter intrusion preventing member 72 has flexibility, and when the foreign matter intrusion preventing member 72 comes into contact with the liquid crystal panel 20, the foreign matter intrusion preventing member 72 is deformed, and unnecessary pressure is not applied to the liquid crystal panel 20.

  The cross section of the foreign matter intrusion preventing member 72 is not limited to an L shape, and may be a straight foreign matter intrusion preventing member 76 as in the display device 74 of FIG.

Embodiment 4
Although the support substrate 32 of the above embodiment is a single plate, it may be a support substrate 82 formed of a plurality of plates 84 and 86 as in the display device 80 of FIG. For example, another plate 86 to be the convex portion 46 is attached to one plate 84. The peripheral edge of one plate 84 is a recess 44.

  Since one plate 84 serving as the recess 44 supports the touch panel 16, one plate 84 is formed of glass, and the other plate 86 is formed of resin. Other plates 86 can be easily attached. In order to form the recess 44, the work of attaching another plate 86 is performed instead of the work of cutting the peripheral edge of the support substrate, and the manufacture is easy.

Embodiment 5
As in the display device 90 of FIG. 8, a touch panel 92 in which the support substrates 32 and 82 are omitted may be used. It is desirable to increase the strength by increasing the thickness of the cover film 36. A foreign matter intrusion prevention member 94 is disposed between the electrode film 34 and the liquid crystal panel 20. When the width of the non-display area 26 is sufficiently wide, the foreign matter intrusion prevention member 94 can be attached without the convex portions 46 of the support substrates 32 and 82.

Embodiment 6
The number of the electrode films 34 is changed depending on the shape and forming method of the electrodes. For example, when electrodes in the X direction and the Y direction are formed on one surface 50 and the other surface 52 of one electrode film 34, the electrode film 34 is formed. Alternatively, the electrodes in the X direction and the Y direction intersect with each other by sandwiching an insulator or using a jumper to form both electrodes on one surface 50 or the other surface 52 of one electrode film 34. Can do.

  By forming an electrode on one surface 50 of the electrode film 34, the cover film 36 can be omitted.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Each embodiment is not independent, and may be implemented by combining each embodiment.

10, 60, 70, 74, 80, 90: Display device 12: Housing 14: Liquid crystal module 16, 92: Touch panel 18, 62, 72, 76, 94: Foreign matter intrusion prevention member 20: Liquid crystal panel 22: Bezel 24: Display area 26: Non-display area 28: Opposing portion 30: Space 32, 82: Support substrate 34: Electrode film 36: Cover film 38: Bracket 40, 50: One side 42, 52: Other side 44: Concave portion 46: Convex portion 48 : Steps 84, 86: Board

Claims (6)

A touch panel;
Display means arranged at a predetermined distance from the touch panel;
And bezel holds an edge of the display unit, bent on the display surface side from the back side of a display device, the facing portion of the display device to have a space for the display device,
Between the display area of the display means and the bezel, a foreign matter intrusion prevention member provided between the touch panel and the display means,
A display device comprising: One side of the touch panel faces the display means,
2. The display device according to claim 1, wherein one surface of the touch panel has a step between the display area of the display unit and the bezel for forming a convex portion protruding toward the display unit. The display device according to claim 2, wherein the foreign matter intrusion preventing member is disposed between the convex portion of the touch panel and the display means. The display device according to claim 2, wherein the foreign matter intrusion preventing member is disposed so as to close an opening of a space formed by the bezel and the display means. The display device according to claim 2, wherein the touch panel includes a support substrate having the convex portion. The touch panel is
The support substrate;
An electrode film laminated on the support substrate and provided with an electrode;
A resin cover film laminated on the electrode film;
A display device according to claim 5 comprising:

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