JP2015084148A - Touch type information input image display device and information equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input device capable of preventing a damage of a transparent electrode regardless of a pressing position of a touch panel and preventing an influence from affecting a liquid crystal layer by pressing of the touch panel.SOLUTION: A touch type information input image display device includes at least a resin cover 2; a touch panel 1; a liquid crystal panel 4 providing a polarizer 6 on an image display surface side; a housing 8 for covering at least an outer periphery of the liquid crystal panel 4; and an external housing 3 incorporating these elements and having an opening on the side of the resin cover 2, and is laminated with the resin cover 2, the touch panel 1, and the liquid crystal panel 4. The polarizer 6 is smaller than an external shape of the liquid crystal panel. The touch type information input image display device includes a spacer 9 having a thickness which is almost the same surface as the opening that arranges the polarizer 6 on a center of an upper surface of an outer periphery of the housing. The spacer 9 is brought into contact with a lower surface of the touch panel 1, and an outer periphery end part of the spacer 9 is joined with an opening end part of the external housing 3.

Description

  The present invention relates to a touch-type information input image display device and an information device having a touch panel covered with a resin cover.

  2. Description of the Related Art In recent years, touch-type information input image display devices (hereinafter referred to as input devices) have been adopted in operation units of various electronic devices such as smartphones, portable information terminals such as tablets, and car navigation systems. The input device is used as an input device for detecting a contact position of a fingertip or a pen tip on a display surface of a display panel such as a liquid crystal display device or an organic EL device. The input method is roughly classified into a resistance film type, a capacitance type, an optical type, and an ultrasonic type.

  Among them, the capacitance type input device has a matrix-like translucent conductive film formed on a single transparent substrate, and changes in capacitance induced by the contact of a finger or the like between the electrodes. Is detected as a weak current change to identify the contacted position on the touch panel. The electrostatic capacitance type further includes a surface type and a projection type. The projected capacitive input device includes a plurality of electrodes arranged on a grid in the X direction and the Y direction, is capable of multi-touch, and is currently spreading rapidly.

  There are a glass type and a film type in the projected capacitive touch panel sensor. In the former, since the transmittance is higher than that of the film and the positional accuracy of the wiring pattern formed on the glass is superior to that of the film, the frame portion covering the wiring can be made small. Furthermore, since the surface smoothness is excellent, there is an advantage that it looks better than the film type. In general, a glass type is employed in small products such as a mobile terminal such as a smartphone that requires high definition and low power consumption.

  The latter is advantageous in that it is easy to remove bubbles when it is bonded to another display device or a cover glass because it is lightweight, hard to break, low in manufacturing cost, and flexible. In general, many film types are used for medium-sized and large-sized products such as tablet computers and televisions that require low cost and easy productivity.

  The uppermost surface of the input device, that is, the input unit is covered with a cover to protect the touch panel sensor as described above. In general, a glass substrate or a resin substrate is known, and a glass substrate is used in many cases (see FIG. 4).

  However, due to the thickness and weight of glass substrates, there is a problem that the design and manufacturing process of input devices are restricted, making it difficult to meet the demand for weight reduction, productivity improvement, and cost reduction required by the market. is there.

  Therefore, a resin base material (see FIG. 5) has attracted attention as a substitute for glass. For example, there is a proposal to prevent bending due to pressing by making the operation range of the touch panel narrower than the touch panel sensor arranged at the lower part (Patent Document 1). However, in this proposal, there still remains a problem that warpage and deflection occur due to the influence of the environmental temperature and humidity used due to the difference in linear expansion coefficient from the casing member to which the resin base material is attached (see FIG. 7).

Further, for example, a display sheet (corresponding to a resin cover in the present invention), a touch panel, and a liquid crystal panel are used with a metal frame and a resin frame through a cushion member, that is, a rear case at the side and bottom of the liquid crystal panel. There is a proposal to fix to (Patent Document 2). However, when the liquid crystal panel is fixed to the rear case in this way, there is a problem that the pressure of the touch panel affects the liquid crystal layer of the liquid crystal panel and the quality is deteriorated by directly joining the display sheet, the touch panel, and the liquid crystal panel.

JP 2009-277121 A JP 2010-176261 A

  The present invention has been made in view of the above problems, and can prevent damage to the transparent electrode regardless of the pressing position of the touch panel, and can prevent the influence of the touch panel pressing on the liquid crystal layer. The purpose is to provide a device.

The invention according to claim 1 for achieving the above object includes a liquid crystal panel including at least a resin cover, a touch panel, and a polarizing plate on the image display surface side, a casing that covers at least an outer periphery of the liquid crystal panel, and a built-in unit of these. And a touch-type information input image display device comprising an external housing having an opening on the resin cover side,
The resin cover, the touch panel, and the liquid crystal panel are laminated,
The polarizing plate is smaller than the outer shape of the liquid crystal panel,
A spacer having a thickness that is substantially flush with the outer surface of the polarizing plate and the outer surface of the polarizing plate on the upper surface of the outer periphery of the housing,
The spacer is in contact with the lower surface of the touch panel,
In the touch-type information input image display device, an outer peripheral end portion of the spacer is joined to an opening end portion of the external casing.

  The invention according to claim 2 is the touch-type information input image display device according to claim 1, wherein an outer peripheral end portion of the spacer is larger than an outer peripheral portion of the casing.

  The touch-type information input image display device according to claim 1 or 2, wherein the lower surface of the touch panel, the polarizing plate, and the spacer are joined via an adhesive. It is.

  The invention according to claim 4 is characterized in that the outer peripheral part of the resin cover and the touch panel is larger than the outer peripheral part of the upper surface of the casing covering the outer periphery of the liquid crystal panel. It is a touch-type information input image display device.

  The invention according to claim 5 is an information device including the touch-type information input image display device according to any one of claims 1 to 4.

  According to the first and second aspects of the present invention, even in a structure in which a resin cover is provided on the upper surface of the touch panel, an opening for arranging the polarizing plate in the central portion on the upper surface of the outer peripheral portion of the housing and the polarizing plate Regardless of the position where the touch panel is pushed by joining the bottom surface of the touch panel, the polarizing plate and the spacer, and joining the spacer and the housing, with a spacer having a thickness that is substantially flush with the outer surface It is possible to prevent the transparent electrode from being damaged and to prevent the liquid crystal layer from being affected by pressing the touch panel.

  That is, by joining the spacer with the resin cover and the liquid crystal panel, it becomes a joint between the resins, the difference in the linear thermal expansion coefficient due to the difference in the material near the joint is small, and it is possible to suppress the conventional warping and bending, Regardless of where the touch panel is pressed, damage due to peeling of the transparent electrode can be prevented. In addition, by fixing the liquid crystal panel to the housing via the spacer, even if the touch panel is directly bonded to the liquid crystal panel, it is possible to prevent the liquid crystal layer from being affected by pressing the touch panel.

  Further, according to the third aspect, the adhesive is interposed between the lower surface of the touch panel, the polarizing plate located at the uppermost part of the liquid crystal panel, and the spacer, particularly in the joint between the touch panel and the liquid crystal panel. Since all the neighborhoods are resin materials, the difference of each linear thermal expansion coefficient can be made smaller, and the effect which suppresses the above-mentioned curvature and bending can be enlarged.

  According to claim 4, the outer periphery of the resin cover and the touch panel is larger than the outer periphery of the upper surface of the casing covering the outer periphery of the liquid crystal panel, so that fine dust, dust, etc. enter the liquid crystal panel. Can be prevented.

  Further, according to claim 5, it is possible to provide an information device as a final product in which the touch-type information input image display device of the present invention is incorporated.

  As described above, according to the present invention, the touch-type information input image display can prevent the transparent electrode from being damaged regardless of the pressing position of the touch panel, and can prevent the liquid crystal layer from being affected by the pressing of the touch panel. A device and an information device including the device can be provided.

1 is a schematic cross-sectional view showing an embodiment of a touch-type information input image display device according to the present invention. The cross-sectional schematic which shows joining to the spacer which concerns on this invention, a touchscreen, and a liquid crystal panel housing | casing. 1 is a partial exploded perspective view of a touch-type information input image display device according to the present invention. The cross-sectional schematic of the conventional glass cover type input device. Sectional schematic of the conventional resin cover type input device. 6 is a schematic cross-sectional view of the touch panel shown in FIGS. Sectional schematic which shows the malfunction example of the conventional resin cover type input device.

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

  FIG. 1A is a schematic cross-sectional view showing an embodiment of a resin cover-type touch-type information input image display device (hereinafter referred to as an input device) according to the present invention. Specifically, an input device including a resin cover 2, a touch panel 1, a liquid crystal panel 4, a backlight unit 7, a casing 8 that covers the outer periphery of the liquid crystal panel, a spacer 9, and an external casing 3 that protects the whole. It is.

The feature of the input device of the present invention is that a resin cover 2 is provided on the upper surface of the touch panel 1, and the polarizing plate 6 positioned at the top of the liquid crystal panel 4 is smaller than the opening of the liquid crystal panel 4. Further, the casing 8 covering the outer periphery of the liquid crystal panel 4 has an upper portion opened to be equal to or larger than the liquid crystal panel 4, and the upper surface of the casing 8 has a height higher than the outermost surface of the polarizing plate 6. Are provided with the same spacer 9. The spacer 9 has an inner peripheral end near the outer peripheral end of the polarizing plate 6 and an outer peripheral end larger than the outer periphery of the casing 8 that covers the outer periphery of the liquid crystal panel 4. Furthermore, the lower surface of the touch panel 1 is bonded to the polarizing plate 6 and the spacer 9,
The input device is characterized in that it is joined to the external housing 3 via a spacer 9.

  Note that a backlight unit 7 located on the back surface of the liquid crystal panel 4 is housed in a housing 8 that covers the outer periphery of the liquid crystal panel 4.

  FIG.1 (b) has shown the cross-sectional schematic of the touchscreen 1 which concerns on this invention. The touch panel 1 includes an adhesive 1c for bonding to the resin cover 2 and a wiring pattern for sensing formed from the observer side of the input device, that is, the upper side of FIG. The sensor film 1b on which the wiring pattern is formed, the polarizing plate 6 and the adhesive 1c for bonding to the spacer 9 are sequentially laminated.

  FIG. 2 is a schematic cross-sectional view of the input device according to the present invention. FIG. 2A shows a casing 8 that covers the outer periphery of the liquid crystal panel 4 including the backlight unit 7 and the casing 8. The form which joined the spacer 9 to the upper part is shown. Moreover, FIG.2 (b) has shown the form when the touchscreen 1 united with the resin cover 2 is joined on FIG.2 (a).

  FIG. 3 is an exploded perspective view showing the positional relationship of each member constituting the input device of the present invention, in order to explain the input device of the present invention more specifically.

  The resin cover 2 according to the present invention is not particularly limited as long as it is a plastic film having high transparency (light transmittance), mechanical strength, and chemical stability. The form may be a sheet. For example, polyethylene terephthalate (PET) resin is preferable from the viewpoint of cost. The resin cover 2 is bonded to the touch panel 1 described below via an adhesive 1c that is the uppermost layer. Therefore, in order to strengthen the bonding with the pressure-sensitive adhesive 1c, one of the resin covers 2 may be subjected to surface treatment such as easy adhesion treatment, plasma treatment, and corona treatment.

  The touch panel 1 according to the present invention includes, for example, an adhesive 1c for bonding to the resin cover 2 and a sensing wiring pattern, and a sensor film 1a, an adhesive 1c, and a driving wiring pattern as shown in FIG. A pressure-sensitive adhesive 1c for bonding to the formed sensor film 1b, the polarizing plate 6 and the spacer 9 is sequentially laminated.

The sensor film 1b on which the sensing wiring pattern is formed and the sensor film 1a and the driving wiring pattern are formed, for example, is formed by laminating a transparent conductive film such as ITO on a transparent base film, and then patterning by a photolithography method. An electrode is formed. As the transparent electrode film other than ITO, tin oxide (SnO ₂ ), zinc oxide (ZnO), or the like can be used, and can be formed by a vacuum deposition method or a sputtering method.

  The transparent substrate film is not particularly limited as long as it is a material having surface smoothness, heat resistance, mechanical strength, chemical stability and the like in addition to transparency. For example, PET, polyethylene naphthalate (PEN), polycarbonate (PC), polyethersulfone, polyarylate, cyclic polyolefin, polyimide and the like can be mentioned.

  The transparent base film may contain various known additives and stabilizers such as antistatic agents, plasticizers, lubricants, and easy adhesives. In order to improve adhesion, corona treatment, plasma treatment, chemical treatment, or the like may be performed as pretreatment.

The pressure-sensitive adhesive 1c is not particularly limited as long as it has transparency. Preferably it can firmly adhere films, etc., is excellent in optical transparency, exhibits adhesive properties such as moderate wettability, cohesiveness and adhesiveness, does not fire even under high temperature and high humidity conditions, From the viewpoint of excellent weather resistance, heat resistance and the like, an adhesive layer made of an acrylic adhesive is preferably used.

  Specific examples of the acrylic pressure-sensitive adhesive include acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyvinyl ether, vinyl acetate / vinyl chloride copolymer, modified polyolefin, epoxy-based, fluorine-based, and natural rubber. Those having a base polymer of a rubber-based polymer such as synthetic rubber can be appropriately selected and used.

  The liquid crystal panel 4 according to the present invention is not particularly limited as long as the liquid crystal panel has a structure in which, for example, a polarizing plate, a color filter substrate, a liquid crystal layer, a TFT substrate, and a polarizing plate are sequentially incorporated from the observation side.

  For the spacer 9 according to the present invention, a metal plate such as an aluminum plate or a stainless plate can be used, and among them, a stainless plate excellent in strength and durability even when used as a thin plate is preferable. In addition, as a joining (fixing) method with the touch panel 1, it is possible through the adhesive 1c formed in the lowest layer of the touch panel 1. In addition, for example, a method such as screwing can be used for joining to the external housing 3 that surrounds the entire input device, but the method is not particularly limited.

  As described above, the input device of the present invention uses a resin substrate as an alternative to a glass substrate, and even if the touch panel 1 and the liquid crystal panel 4 are directly bonded, the input device is bonded to the external housing 3 via the spacer 9. Thus, it is possible to provide an input device capable of preventing the transparent electrode from being damaged regardless of the pressing position of the touch panel 1 and preventing the liquid crystal layer from being affected by the pressing of the touch panel 1.

  The touch-type information input image display device according to the present invention can be used as various types of input devices such as smart phones, portable information terminals such as tablets, and car navigation systems.

1. Touch panel 1a ... Sensor film A
1b ・ ・ Sensor film B
1c..Adhesive 2 ... Resin cover 3 ... External housing 4 ... Liquid crystal panel 5 ... Liquid crystal panel main part 6 ... Polarizing plate 7 ... Backlight unit 8 ... Liquid crystal Housing 9 that covers the outer periphery of the panel ... Spacer

Claims (5)

A liquid crystal panel including at least a resin cover, a touch panel, and a polarizing plate on the image display surface side, a casing that covers at least the outer periphery of the liquid crystal panel, and an external casing that includes these and has an opening on the resin cover side A touch-type information input image display device comprising:
The resin cover, the touch panel, and the liquid crystal panel are laminated,
The polarizing plate is smaller than the outer shape of the liquid crystal panel,
A spacer having a thickness that is substantially flush with the outer surface of the polarizing plate and the outer surface of the polarizing plate on the upper surface of the outer periphery of the housing,
The spacer is in contact with the lower surface of the touch panel,
The touch type information input image display device, wherein an outer peripheral end portion of the spacer is joined with an opening end portion of the external casing.   The touch-type information input image display device according to claim 1, wherein an outer peripheral end portion of the spacer is larger than an outer peripheral portion of the housing.   The touch-type information input image display device according to claim 1, wherein the lower surface of the touch panel is bonded to the polarizing plate and the spacer through an adhesive.   4. The touch-type information input image display device according to claim 1, wherein an outer peripheral part of the resin cover and the touch panel is larger than an outer peripheral part of an upper surface of a casing covering the outer periphery of the liquid crystal panel.   An information apparatus comprising the touch-type information input image display device according to any one of claims 1 to 4.