KR20130022259A

KR20130022259A - Slim type touch device

Info

Publication number: KR20130022259A
Application number: KR1020110085211A
Authority: KR
Inventors: 쿠에이-칭 왕; 싱-치아오 린; 렝-치에 린; 밍-추 투
Original assignee: 이터보터치 테크날로지 인코퍼레이티드
Priority date: 2011-08-25
Filing date: 2011-08-25
Publication date: 2013-03-06

Abstract

Slim type touch device comprising a touch panel, a display module, and a housing. The touch panel and display module are installed in the housing. The touch panel includes a plurality of sensing pads formed on the lower side of the touch panel. The lower side of the touch panel is mounted to the display module by an optical clear adhesive.

Description

Slim type touch device {SLIM TYPE TOUCH DEVICE}

The present invention relates to a touch device, and more particularly to a slim type touch device.

Recently, as the number of mobile phones having a touch interface has increased, touch panels have become popular. Many manufacturers are involved in the development of touch panels. Capacitive touch devices have good sensitivity and will become the next-generation mainstream to replace resistive touch devices. However, capacitive touch devices are generally not used in consumer products because of their high cost.

Many electrical products, such as mobile phones, digital cameras, personal digital assistants (PDAs), and portable computers, integrate touch panels with display modules to form touch devices, providing users with a wider visible area and limited size. volume) to provide more convenient operation. In addition, in order to protect the touch device from scratches and dust, the touch device has a protective film. For example, the protective film of a mobile phone is a transparent film with sufficient strength, and the thickness of the protective film is about 0.8-1.0 mm. There are several functional films such as filters, polarizers, and hard-wearing films formed on the top surface of the protective film, the thickness of which is about 0.15 mm. Moreover, the capacitive touch panel includes an X-pad, a Y-pad, a substrate, and a plurality of insulation layers, so that the thickness thereof exceeds 1 mm. Since the thickness of the optical clear adhesive (OCA) between the protective film and the touch panel is about 0.15 mm, the thickness after bonding exceeds 2.3 mm. However, if the thickness exceeds 1 mm, the coupling affects not only the difficulty of the mount structure and the profile design, but also the transmission, resulting in a cloud image or a dark image.

Referring to FIG. 1, FIG. 1 is a schematic diagram of a conventional touch device. The touch device 100 includes a display module 110 and a touch panel 120. The touch panel 120 is a capacitive touch panel and includes a plurality of upper sensing pads 122, a plurality of lower sensing pads 124, and a dielectric layer 126 between the upper sensing pads 122 and the lower sensing pads 124. It includes. The protective layer 128 is mounted on the substrate of the upper sensing pad 122 by the OCA 132. The touch panel 120 is mounted on the display module 110 by the double-sided tape 130, and the touch device 100 has a touch control and display function. However, the double-sided tape 130 is used at the edges of the display module 110 and the touch panel 120, so that a gap G exists between the display module 110 and the touch panel 120. When the light beam passes through the gap G, the display module 110 provides a cause of the low quality image due to a decrease in transmittance due to light leakage or refraction between different media. In addition, the combination of the touch panel 120 and the display module 110 makes it impossible to reduce the thickness, and thus cannot meet the requirements of the slim type electric device.

The present invention is to provide a slim type touch device to solve the above problems.

According to an embodiment of the present invention, the touch device includes a display module, a substrate, and a housing. The substrate includes a plurality of sensing pads formed on a lower side of the substrate, and the lower side of the substrate is mounted to the display module by an optical clear adhesive. The housing includes a display module and a substrate.

There is no doubt that the above and other objects of the present invention will become apparent to those skilled in the art by the detailed description and the embodiments shown in the various figures which follow.

According to the present invention, the effect of increasing the sensitivity of the touch panel and enabling smooth operation can be obtained, and the effect of reducing the thickness of the touch device and improving the optical performance can be obtained.

1 is a schematic diagram of a conventional touch device.
2 is a schematic diagram of a slim type touch device of the present invention.
3 is a side view of the touch panel.
4 is a bottom view of the touch panel.
5 is a schematic diagram of a sensing pad of a touch panel according to a first embodiment of the present invention.
6 is a schematic diagram of a sensing pad of a touch panel according to a second embodiment of the present invention.

Referring to FIG. 2, FIG. 2 is a schematic diagram of a slim type touch device of the present invention. The touch device includes a display module 201, a touch panel 203, and a housing 205. The display module 201 and the touch panel 203 are installed in the housing 205. The display module 201 includes a liquid crystal display (LCD) or an organic light-emitting display (OLED). For example, an LCD includes a TFT substrate, a liquid crystal layer, a color filter, and a backlight module. The TFT substrate and the color filter include polarizers respectively formed on the outer surface. The LCD controls the rotation of the liquid crystal to change the transmittance and generates various colors by the color filter. The touch panel 203 includes a plurality of sensing pads formed on the lower side of the substrate. The touch panel 203 is mounted on the display module 201 by an optical clear adhesive (OCA) 207. Accordingly, the plurality of sensing pads 203 of the touch panel may detect movement and touch of a finger or a touch pen.

In addition, the touch panel 203 has a function of a decorative film or a protective film. The substrate of the touch panel 203 may be made of polycarbonate (PC), artone (ARTON), polyether sulfone (PES), zeonor, triacetyl cellulose (TAC) Cellulose), polyethylene terephthalate (PET), or polymethyl methacrylate (PMMA). According to the present invention, the touch panel 203 serves as a decorative film and a protective film. The sensing pads are formed on the lower surface of the touch panel 203. The OCA 207 is entirely coated between the touch panel 203 and the display module 201. In this way, there is no air gap between the touch panel 203 and the display module 201, so that light leakage and image quality of the image are improved. The touch device of the present invention has three layers of a touch panel, an OCA, and a display module. Compared with the prior art, the conventional touch device has five layers of protective layer, OCA, sensing layer, double sided tape, and display module. Therefore, the touch device of the present invention can reduce the thickness of the touch device, improve optical performance, can be used for soft or hard display devices, and can lower costs.

Referring to FIG. 3, FIG. 3 is a side view of the touch panel 203. The lower side of the touch panel 203 includes a frame pattern 301, a plurality of sensing pads 303, and a plurality of conducting wires 305. In an embodiment of the invention, the sensing pad is a transparent electrode made of a silver nano material, a carbon nano tube (CNT) material, or a conductive polymer material. The plurality of conductors are made of metal material. The frame pattern is processed by ink printing to form a decorative pattern. Compared with the prior art, the conventional touch panel has five or three layers. The five layers of the touch panel are a protective layer, an OCA, an upper sensing layer, a dielectric layer, and a lower sensing layer. Three layers of the touch panel are a protective layer, an OCA, and a sensing layer. It includes a sensing layer formed on the lower side of the substrate of the present invention, the upper side of the substrate can be a protective layer, the touch panel has only one layer. Therefore, the touch device of the present invention can reduce the thickness of the touch device and improve the optical performance. In addition, the transparent electrode may be made of silver nano material, CNT, or conductive polymer material to improve the bad coverage resulting from the Indium-Tin-Oxide (ITO) sputtering process.

Referring to FIG. 4, FIG. 4 is a bottom view of the touch panel. The plurality of sensing pads 303 are formed on the lower side of the substrate. The plurality of sensing pads 303 need not intersect in the X and Y directions. Basically, the plurality of sensing pads 303 are regularly aligned on the substrate in a symmetrical and repeating pattern. Each sensing pad 303 is electrically connected to a conductive wire to receive a control signal. Compared with the prior art, the conventional touch panel uses two sensing layers intersecting in the X direction and the Y direction. The first method is that two sensing layers are formed on each of two substrates, or both sides of one substrate. In the second method, two sensing layers are formed on the same side of the substrate, and the sensing pads in the X and Y directions are bridged for isolation.

Referring to FIG. 5, FIG. 5 is a schematic diagram of a sensing pad of a touch panel according to a first embodiment of the present invention. The touch panel 501 includes a plurality of sensing pads 504 and a plurality of conductive lines 502. Each sensing pad 504 is electrically connected to the control circuit 503 through a single conductor 502. When the plurality of sensing pads 504 are touched to generate a sensing signal, the control circuit 503 may calculate the position of the touch point according to the strength of the sensing signal.

Referring to FIG. 6, FIG. 6 is a schematic diagram of a sensing pad of a touch panel according to a second embodiment of the present invention. The touch panel 601 includes a plurality of sensing pads 604 and a plurality of conductive lines 602. The plurality of sensing pads 604 are electrically connected to the control circuit 603 through a plurality of conductive wires 602, and each conductive wire 602 is electrically connected to one sensing pad 604. When the sensing pads 604 are touched to generate sensing signals, the touched sensing pads 604 transmit the sensing signals to the control circuit 603 through their conductive wires 602, respectively. The control circuit 603 may calculate the position of the touch point according to the strength of the sensing signal. In the present embodiment, the sensing pads 01-24 are triangular, and the triangular sensing pads 604 are arranged four by four to form a quadrangle. For example, triangular sensing pads 01, 04, 05 and 10 form a rectangle. Thus, two adjacent sensing pads 604 can more easily generate sensing signals on the X and Y axes, thereby improving the sensitivity of the touch device 600. For example, the triangular sensing pads 01 and 05 may generate sensing signals on both the X and Y axes. In addition, the triangular sensing pads 604 are arranged four by four to form a quadrangle so that the plurality of sensing pads 604 are close to each other on the touch panel 601. Therefore, the triangular sensing pad of the present embodiment can improve sensitivity and smooth operation.

In conclusion, the present invention provides a slim type touch device. The touch device includes a touch panel, a display module, and a housing. The touch panel and display module are installed in the housing. The touch panel includes a plurality of sensing pads formed on the lower side of the touch panel. The lower side of the touch panel is mounted on the display module with optically clear adhesive. The decorative pattern is printed on the lower side of the substrate. The upper side of the substrate can be a protective layer. Thus, the touch panel combines the sensing layer, the protective layer, and the decorative layer into one layer. In addition, the optically clear adhesive is applied entirely between the touch panel and the display module to reduce the thickness of the touch device and improve optical performance.

Those skilled in the art will be able to easily modify or adapt the apparatus and method of the present invention while maintaining the spirit of the present invention.

Claims

Display module;
Board; And
A housing for receiving the display module and the substrate,
The substrate,
A plurality of sensing pads formed on a lower side of the substrate,
The lower side of the substrate is mounted to the display module by an optical clear adhesive,
Touch panel.

The method of claim 1,
The material of the substrate is polycarbonate (PC), arton (ARTON), polyether surlfone (PES: polyether surlfone), ZEONOR, tri-acetyl cellulose (TAC), polyethylene tere Phthalate (polyethylene terephthalate) or polymethyl methacrylate (PMMA),
Touch panel.

The method of claim 1,
The optically clear adhesive is applied as a whole between the substrate and the display module,
Touch panel.

The method of claim 1,
Further comprising a plurality of conductive wires,
Each conductor is electrically connected to one sensing pad,
Touch panel.

The method of claim 1,
And a control circuit electrically connected to the plurality of conductive wires and calculating a position of a touch point according to the strength of a sensing signal generated when the plurality of sensing pads are touched.
Touch panel.

The method of claim 1,
The plurality of sensing pads are a plurality of rectangular sensing pads formed on the substrate,
Four square sensing pads form a rectangle,
Touch panel.

The method of claim 1,
The plurality of sensing pads are a plurality of triangular sensing pads formed on the substrate,
Triangular sensing pad to form four squares,
Touch panel.

The method of claim 1,
The plurality of sensing pads are transparent electrodes made of a silver nano material, a carbon nano tube (CNT) material, or a conductive polymer material.
Touch panel.

The method of claim 1,
Further comprising a frame pattern formed on the lower side of the substrate,
Touch panel.

The method of claim 1,
The display module includes a liquid crystal display (LCD) or an organic light-emitting display (OLED),
Touch panel.