CN103699250A - touch display module and handheld electronic device - Google Patents

Abstract

A touch display module and a handheld electronic device are provided. The touch display module comprises a display panel and a touch panel. The touch panel is provided with a sensing area and a bonding area. The touch panel includes a first substrate, a plurality of driving lines, a plurality of sensing lines, a plurality of leads and a shielding pattern. The driving lines are arranged side by side on the first surface of the first substrate. The sensing lines are arranged on the second surface of the first substrate side by side and form a sensing array with the driving lines. The lead is configured on the second surface and is positioned outside the sensing region. The lead is electrically connected with the sensing line and extends to the bonding area. The shielding pattern is configured on the first surface, and the vertical projection of the second surface covers the lead. A handheld electronic device using the touch display module is also provided.

Description

Touch display module and handheld electronic device

technical field

The present invention relates to a handheld electronic device, and in particular to a handheld electronic device with a touch display module.

Background technique

In today's information society, human beings are increasingly dependent on consumer electronic devices. For example, mobile phones, personal digital assistants (PDAs) and tablet computers (Tablet PCs) can be seen everywhere in life, so consumer electronic devices are inseparable from the daily life of modern people. In order to achieve more convenience, smaller size, and more user-friendly, many products have changed from traditional input devices such as keyboards or mice to use touch panels as input devices.

Touch panels can be roughly classified into resistive touch panels, capacitive touch panels, optical touch panels, acoustic wave touch panels, and electromagnetic touch panels according to different sensing modes. Compared with other types of touch panels, capacitive touch panels have advantages such as fast response time, good reliability, and high definition, so they are widely used in various handheld electronic devices.

The capacitive touch panel forms a sensing array through a plurality of interlaced sensing series to achieve surface sensing. When the user touches the touch panel with a finger, the touch panel will determine the position of the finger contact according to the capacitance change on the sensing array. However, outside the sensing array of the touch panel, there are still many connection lines arranged. In order to prevent these connecting lines from being exposed and affecting the appearance of the electronic device, it is usually necessary to form a shielding area on the transparent cover of the electronic device to cover these connecting lines, thus increasing the manufacturing cost. When the user operates the touch panel, the fingers are likely to induce capacitive coupling effect with these connecting lines, which affects the sensing accuracy of the touch panel. In addition, when the electronic device is in operation, the electronic components inside the electronic device are likely to generate an electromagnetic field, and the electromagnetic field is accompanied by the action of voltage and current to affect the performance of the touch panel.

Contents of the invention

The invention provides a touch display module, which includes a display panel and a touch panel. The touch panel is configured on the display panel and has a sensing area and a bonding area outside the sensing area. The touch panel includes a first substrate, a plurality of driving lines, a plurality of sensing lines, a plurality of leads and a shielding pattern. The first substrate has a first surface and a second surface opposite to the first surface, and the second surface faces the display panel. The driving lines are arranged side by side on the first surface and respectively extend along the first direction. The sensing lines are arranged side by side on the second surface and respectively extend along the second direction. The first direction intersects the second direction. The driving lines and the sensing lines form a sensing array in the sensing area. The lead wires are arranged on the second surface and outside the sensing area. The lead wires are respectively electrically connected to the sensing lines and extend to the bonding area. The shielding pattern is arranged on the first surface, and the vertical projection of the shielding pattern on the second surface will cover the leads.

The present invention also proposes a handheld electronic device, which includes a body and the aforementioned touch display module. The body has a display opening, and the touch display module is arranged in the display opening.

In an embodiment of the invention, the first direction of the driving lines is perpendicular to the long axis direction of the bonding area.

In an embodiment of the invention, the surface roughness of the sensing lines is lower than that of the driving lines.

In an embodiment of the present invention, the sensing lines are formed by a lithographic etching process, and the driving lines are formed by a printing process.

In an embodiment of the invention, the width of each sensing line is smaller than the width of each driving line.

In an embodiment of the present invention, the above-mentioned leads are respectively located on opposite sides of the sensing array, and the shielding pattern includes a first sub-pattern and a second sub-pattern, which are respectively located on opposite sides of the sensing array, and are located on the opposite sides of the leads. above.

In an embodiment of the present invention, the above-mentioned touch panel further includes a second substrate disposed on the second surface, and the sensing line is located between the first substrate and the second substrate.

In an embodiment of the present invention, the above-mentioned touch panel further includes a first pad and a second pad. The first pads are located on the first surface and arranged side by side in the bonding area, and the first pads are respectively electrically connected to the driving lines. The second pads are located on the second base material and arranged in the bonding area. The second pads are respectively electrically connected to the sensing lines. The first base material has an opening exposing the second pads.

In an embodiment of the present invention, the above-mentioned shielding pattern is grounded.

In an embodiment of the present invention, the material of the shielding pattern includes metal.

Based on the above, the touch display module of the present invention uses the shielding pattern to cover the lower lead wires, so as to avoid the lead wires from being exposed. When the user touches the touch display module, the shielding pattern can isolate and protect the lead wires, avoiding the capacitive coupling effect between the touching object and the lead wires and affecting the normal operation of the handheld electronic device. In addition, when the shielding pattern is grounded, it can also dissipate the electrostatic charge accumulated during the manufacturing or assembly process, so as to avoid electrostatic discharge (ElectroStatic Discharge, ESD) or electromagnetic interference (ElectroMagnetic Interference, EMI) generated during the operation of electronic devices from damaging the sensing circuit.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1A illustrates a touch display module according to an embodiment of the present invention.

FIG. 1B is a schematic diagram when the touch display module of FIG. 1A is in contact with an external conductor.

FIG. 2 is a top view of the touch display module in FIG. 1A .

FIG. 3 is a schematic diagram of a handheld electronic device using the touch display module of FIG. 1A .

[Description of main component symbols]

10: Handheld Electronic Devices

10a: Top

10b: Bottom

50: Body

52: Display opening

100: touch display module

110: display panel

120: Touch panel

120a: sensing area

120b: Junction zone

121: First base material

121a: first surface

121b: second surface

121c: opening

122: Drive line

124: Sensing line

126: lead

128: shield pattern

128a: First sub-pattern

128b: Second sub-pattern

129: Second substrate

130: first pad

132: Second pad

134: flexible circuit board

201: external conductor

D1: first direction

D2: Second direction

Detailed ways

FIG. 1A illustrates a touch display module according to an embodiment of the present invention. For clarity, FIG. 1A omits some possible film layers or elements. As shown in FIG. 1A , the touch display module 100 of the present invention includes a display panel 110 and a touch panel 120 . The touch panel 120 is disposed on the display panel 110 and has a sensing region 120 a and a bonding region 120 b outside the sensing region 120 a. The touch panel 120 includes a first substrate 121 , a plurality of driving lines 122 , a plurality of sensing lines 124 , a plurality of lead lines 126 and a shielding pattern 128 . The first substrate 121 has a first surface 121 a and a second surface 121 b opposite to the first surface 121 a, and the second surface 121 b faces the display panel 110 . The driving lines 122 are arranged side by side on the first surface 121 a and extend along the first direction D1 respectively. In addition, the first direction D1 of these driving lines is perpendicular to the long axis direction of the bonding region 120b. The sensing lines 124 are arranged side by side on the second surface 121b, and respectively extend along the second direction D2, the first direction D1 intersects the second direction D2, the driving lines 122 and the sensing lines 124 are formed in the sensing area 120a sensing array. The lead wires 126 are disposed on the second surface 121b and located outside the sensing area 120a. These lead wires 126 are respectively electrically connected to the sensing lines 124 and extend to the bonding area 120b. The shielding pattern 128 is disposed on the first surface 121a, and the vertical projection of the shielding pattern 128 on the second surface 121b will cover the lead 126 .

FIG. 1B is a schematic diagram when the touch display module of FIG. 1A is in contact with an external conductor. In this embodiment, the plurality of driving lines 122 and the plurality of sensing lines 124 of the touch display module 100 form an array in the sensing region 120 a to detect the position of the user touching the sensing region 120 a and transmit signals. The shielding pattern 128 configured on the first surface 121a will cover the lead wire 126 in the vertical projection on the second surface 121b. When an external conductor 201 contacts (for example, a user's finger touches) the first surface 121a above the lead wire 126, the shielding pattern 128 can protect the lead wire 126 connected to the sensing line 124 from being triggered to generate capacitance and affect the performance of the touch display module 100 .

1A in detail, the plurality of driving lines 122 arranged side by side in the first direction D1 and the plurality of sensing lines 124 arranged side by side in the second direction D2 are all arranged at equal intervals, and when sensing The regions 120a form an equidistant array to enhance the sensing accuracy, and the leads 126 are arranged on opposite sides of the sensing array. In detail, in this embodiment, the driving line 122 and the sensing line 124 intersect (vertical in the figure), in order to enable the sensing signal sent from the driving line 122 and the sensing line 124 to be connected from the touch display module 100 An output position of the area 120b is output, and the sensing line 124 needs to be electrically connected to the lead wire 126, and the extension direction of the lead wire 126 is, for example, the same as that of the driving line 122, so that the sensing signal sent from the sensing line 124 is received by the lead wire 126. Delivered to the output location of the junction area 120b. The lead wire 126 is disposed outside the sensing area 120a. In addition, in order to avoid increasing the frame size of the touch display module 100 , the line width and spacing of each lead 126 can be the minimum size allowed by the process.

The shielding pattern 128 includes a first sub-pattern 128 a and a second sub-pattern 128 b, and the first sub-pattern 128 a and the second sub-pattern 128 b are respectively located on opposite sides of the sensing array and correspondingly located above the lead 126 . The shielding pattern 128 can not only protect the leads 126 from induction and generate capacitance, but also can be grounded to prevent the operation of the touch display module 100 from being affected by electromagnetic interference (EMI) or electrostatic effects (ESD). The ground line of the module 100 is co-constructed. The material of the shielding pattern 128 may be a wire made of metal, or a conductive material such as Indium Tin Oxide (ITO). In this embodiment, the shielding pattern 128 can be a metal material, and in the process of the touch display module 100 , the shielding pattern 128 and the driving line 122 can be manufactured in different processes. In addition, the shielding pattern 128 can also be made of the same transparent conductive material as the driving line 122 , such as ITO. However, the present invention is not limited here. In addition, a printing layer (such as printing black paint, white paint or paint of other colors) can be provided on the top of the shielding pattern 128, the purpose is to mark the sensing region 120a and the bonding region 120b, and avoid users from See land 120b.

In this embodiment, the touch panel 120 further includes a second substrate 129 disposed on the second surface 121 b, and the sensing line 124 is located between the first substrate 121 and the second substrate 129 . The first substrate 121 and the second substrate 129 are, for example, transparent substrates such as glass or polyethylene terephthalate (PET). Between the first base material 121 and the second base material 129, the first base material 121 and the second base material 129 can be bonded by using optical glue. The colloid between 121 and the second substrate 129 affects the display quality. However, the present invention is not limited here.

FIG. 2 is a top view of the touch display module in FIG. 1A . Please refer to FIG. 2 , in this embodiment, the touch panel 120 further includes a plurality of first pads 130 and a plurality of second pads 132 . The first pads 130 are, for example, located on the first substrate 121 and arranged side by side in the bonding area 120 b. The first pads 130 are respectively electrically connected to the driving lines 122 . The second pads 132 are located on the second substrate 129 and are arranged side by side in the bonding area 120b. The second pads 132 are respectively electrically connected to the sensing lines 124, wherein the first substrate 121 has an opening 121c (shown in the figure). shown as two), exposing the second pad 132 . In detail, the sensing line 124 is electrically connected to the second pad 132 through the lead wire 126. The lead wire 126 is distributed on both sides of the sensing line 124, so the second pad 132 is respectively disposed on the second substrate 129. sides. On the first pad 130 and the second pad 132 , the sensing signal from the driving line 122 and the sensing line 124 can be output through a flexible circuit board 134 .

FIG. 3 is a schematic diagram of a handheld electronic device using the touch display module of FIG. 1A . Please refer to FIG. 3 , the handheld electronic device 10 includes a body 50 and a touch display module 100 . The body 50 has a display opening 52 , and the touch display module 100 is disposed in the display opening 52 . The handheld electronic device 10 is, for example, a smart phone or a tablet computer. The driving lines 122 may be a plurality of lines made of a metal layer such as silver on the first surface 121a by using a printing process. As far as the current technology is concerned, when using the printing process to make circuits, the line width of each driving line 122 and the minimum distance between adjacent driving lines 122 can reach 60 μm (micrometer). In addition, the sensing line 124 and the lead line 126 can be used on a membrane material with a metal layer, and a plurality of lines can be fabricated by a lithographic etching process. As far as the current technology is concerned, when the circuit is fabricated by the lithographic etching process, the line width of each sensing line 124 and the minimum distance between adjacent sensing lines 124 may be 30 μm (micrometer). In other words, the width of the sensing line 124 is smaller than the width of the driving line 122 . In addition, when the driving line 122 is fabricated by printing process and the sensing line 124 is fabricated by lithographic etching process, the surface roughness of the sensing line 124 is lower than that of the driving line 122 .

In this embodiment, the driving lines 122 and the sensing lines 124 are strip electrodes. However, the driving lines 122 and the sensing lines 124 may also be diamond-shaped or other shaped electrodes.

In other words, when the touch display module 100 of the above embodiment is applied to the handheld electronic device 10 , the first direction D1 where the driving wire 122 extends may be the direction extending from the top 10 a to the bottom 10 b of the handheld electronic device 10 . The second direction D2 where the sensing line 124 extends may be an extending direction from the right to the left of the handheld electronic device 10 . The purpose of defining the second direction D2 as extending from the right side to the left side of the handheld electronic device 10 is that the lead wires 126 are arranged on both sides of the sensing line 124, and the width of the lead wires 126 will affect the touch display module 100, The width of two sides outside the sensing area 120a. If the lead wires 126 can be made with a smaller line width and line spacing, the width of the two sides outside the sensing region 120 a can be effectively reduced, which is beneficial to the handheld electronic device 10 .

To sum up, in the touch display module of the present invention, the shielding pattern configured on the first surface will cover the lead wires when vertically projected on the second surface. When the touch display module is touched, the shielding pattern can isolate and protect the lead wires, so as to avoid the capacitance generated between the touching object and the lead wires from affecting the operation of the handheld electronic device. The shielding pattern not only protects the leads, but also grounds them to avoid electrostatic interference or electromagnetic effects. In addition, when the touch display module of the present invention is applied to a hand-held electronic device, the second base material with lead wires and sensing lines can use an etching process with a smaller line width and spacing to reduce the area outside the sensing area. The width of both sides is beneficial to the narrow frame design of the handheld electronic device.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention When depending on what is defined in the appended claims shall prevail.

Claims (11)

1. A touch display module, comprising: a display panel; A touch panel, configured on the display panel, and has a sensing area and a bonding area outside the sensing area, the touch panel includes: A first substrate having a first surface and a second surface opposite to the first surface, wherein the second surface faces the display panel; A plurality of driving lines are arranged side by side on the first surface and respectively extend along a first direction; A plurality of sensing lines are arranged side by side on the second surface and respectively extend along a second direction, the first direction intersects with the second direction, the driving lines and the sensing lines form a grid in the sensing area a sensing array; a plurality of routing traces, configured on the second surface and outside the sensing area, these routing traces are respectively electrically connected to the sensing lines, and extend to the bonding area; and A shielding pattern is arranged on the first surface, and the vertical projection of the shielding pattern on the second surface will cover the leads. 2. The touch display module as claimed in claim 1, wherein the first direction of the driving lines is perpendicular to the long axis direction of the bonding area. 3. The touch display module as claimed in claim 1, wherein the surface roughness of the sensing lines is lower than the surface roughness of the driving lines. 4. The touch display module as claimed in claim 3, wherein the sensing lines are formed by a lithographic etching process, and the driving lines are formed by a printing process. 5. The touch display module as claimed in claim 1, wherein a width of each sensing line is smaller than a width of each driving line. 6. The touch display module as claimed in claim 1, wherein the lead wires are respectively located on opposite sides of the sensing array, and the shielding pattern comprises a first sub-pattern and a second sub-pattern respectively located on the sensing array. opposite sides of the array and above these leads. 7. The touch display module according to claim 1, wherein the touch panel further comprises a second substrate disposed on the second surface, and the sensing lines are located between the first substrate and the second substrate between substrates. 8. The touch display module according to claim 7, wherein the touch panel further comprises: a plurality of first pads located on the first surface and arranged side by side in the bonding area, the first pads are respectively electrically connected to the driving lines; and A plurality of second pads are located on the second base material and arranged side by side in the bonding area. These second pads are respectively electrically connected to the sensing lines, wherein the first base material has an opening exposing the These second pads. 9. The touch display module as claimed in claim 1, wherein the shielding pattern is grounded. 10. The touch display module as claimed in claim 1, wherein a material of the shielding pattern comprises metal. 11. A handheld electronic device comprising: a body with a display opening; The touch display module according to claim 1 is disposed on the display opening.

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