TWI470500B - Touch display module and handheld electronic device - Google Patents

Description

Touch display module and handheld electronic device

The present invention relates to a handheld electronic device, and more particularly to a handheld electronic device having a touch display module.

In today's information society, human dependence on consumer electronic devices is increasing. Mobile phones, personal digital assistants (PDAs), and tablets (Tablet PCs) are everywhere in life, so consumer electronic devices are inextricably linked to the daily lives of modern people. In order to achieve convenience, volume, and humanization, many products have been converted from input devices such as traditional keyboards or mice to using touch panels as input devices.

The touch panel can be roughly classified into a resistive touch panel, a capacitive touch panel, an optical touch panel, an acoustic wave touch panel, and an electromagnetic touch panel according to different sensing forms. Capacitive touch panels are widely used in various types of handheld electronic devices because of their advantages of fast response time, good reliability, and high definition compared with other types of touch panels.

The capacitive touch panel constitutes a sensing array by a plurality of sensing series interleaved to achieve surface sensing. When the user touches the touch panel with a finger, the touch panel determines the position of the finger contact according to the change in capacitance on the sensing array. However, in addition to the sensing array of the touch panel, many connection lines are still arranged. In order to avoid the exposure of these connecting lines, The appearance of the electronic device usually requires forming a shielding area on the transparent cover of the electronic device to shield the connecting lines, thereby increasing the manufacturing cost. When the user operates the touch panel, the finger easily induces a capacitive coupling effect with the connection lines, which affects the sensing accuracy of the touch panel. In addition, when the electronic device operates, the electronic components inside the electronic device are prone to generate an electromagnetic field, and the electromagnetic field has an influence on the performance of the touch panel along with the action of voltage and current.

The invention provides a touch display module, which comprises a display panel and a touch panel. The touch panel is disposed 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 the first surface, the second surface facing the display panel. The drive lines are arranged side by side on the first surface and extend in the first direction, respectively. The sensing lines are arranged side by side on the second surface and extend in the second direction, the first direction intersects the second direction, and the driving lines and the sensing lines form a sensing array in the sensing area. The lead wires are disposed on the second surface and outside the sensing region, and the leads are electrically connected to the sensing lines and extend to the bonding regions. The shielding pattern is disposed on the first surface, and a vertical projection of the shielding pattern on the second surface covers the leads.

The invention further provides a handheld electronic device, comprising a body and the touch display module. The body has a display opening, and the touch display module is disposed at the display opening.

In an embodiment of the invention, the first direction of the drive lines is perpendicular to the long axis direction of the land.

In one embodiment of the invention, the surface roughness of the sense lines and leads is lower than the surface roughness of the lead portions of the drive lines.

In one embodiment of the invention, the sense lines and leads are formed via a lithography process, and the lead portions of the drive lines are formed by a printing process.

In one embodiment of the invention, the width of each of the sense lines and the leads is less than the width of the lead portions of the respective drive lines.

In an embodiment of the invention, 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 opposite sides of the sensing array and located at the lead Above.

In an embodiment of the invention, the 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 invention, the touch panel further includes a first pad and a second pad. The first pads are located on the first surface and are juxtaposed in the joint region, and the first pads are electrically connected to the driving lines respectively. The second pads are located on the second substrate and are juxtaposed in the bonding region. The second pads are electrically connected to the sensing lines respectively, and the first substrate has an opening to expose the second pads.

In an embodiment of the invention, the shielding pattern is grounded.

In an embodiment of the invention, the material of the shielding pattern comprises a metal.

Based on the above, the touch display module of the present invention shields the underlying leads by shielding patterns to prevent the leads from being exposed. When the user touches the touch display When the module is used, the shielding pattern can isolate and protect the lead wires, thereby avoiding capacitive coupling effects 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, the electrostatic charge accumulated during the manufacturing or assembly process can be unblocked to avoid ElectroStatic Discharge (ESD) or ElectroMagnetic Interference (EMI) generated by the operation of the electronic device.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1A illustrates a touch display module according to an embodiment of the invention. For clarity of illustration, Figure 1A omits some of the layers or elements that may be present. 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 area 120a and a bonding area 120b outside the sensing area 120a. The touch panel 120 includes a first substrate 121 , a plurality of driving lines 122 , a plurality of sensing lines 124 , a plurality of leads 126 , and a shielding pattern 128 . The first substrate 121 has a first surface 121a and a second surface 121b opposite to the first surface 121a, and the second surface 121b faces the display panel 110. The drive lines 122 are juxtaposed on the first surface 121a and extend in the first direction D1, respectively. Further, the first direction D1 of the drive lines is perpendicular to the long axis direction of the land 120b. The sensing lines 124 are arranged side by side on the second surface 121b and extend in the second direction D2 respectively. 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 within. The leads 126 are disposed on the second surface 121b and outside the sensing region 120a. The leads 126 are electrically connected to the sensing line 124 and extend to the bonding region 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 covers the lead 126.

FIG. 1B is a schematic diagram of the touch display module of FIG. 1A 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 area 120a to detect the position of the user's touch sensing area 120a and transmit signals. The shield pattern 128 disposed on the first surface 121a, the vertical projection on the second surface 121b covers the lead 126, and when an external conductor 201 contacts (eg, a user's finger contacts) the first surface 121a above the lead 126, the shield pattern The 128 can be connected to the lead 126 of the sensing line 124 to prevent the capacitor from being triggered to affect the performance of the touch display module 100.

The line arrangement relationship of the embodiment of FIG. 1A is described in detail. The plurality of driving lines 122 arranged in the first direction D1 and the plurality of sensing lines 124 arranged in the second direction D2 are equally spaced and in the sensing area. The 120a constitutes an equidistant array to enhance the accuracy of the sensing, and the leads 126 are disposed on opposite sides of the sensing array. In detail, in this embodiment, the driving line 122 and the sensing line 124 intersect (shown as vertical), so that the sensing signals emitted from the driving line 122 and the sensing line 124 can be connected from the touch display module 100. An output position of 120b is output, and the sensing line 124 is electrically connected to the lead 126, and the extending direction of the lead 126 is, for example, the same as the driving line 122, so that the sensing signal sent from the sensing line 124 is transmitted to the sensing line 124 via the lead 126. The output position of the land 120b. The lead 126 is an area disposed outside the sensing region 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 may be the minimum size allowed by the process.

The shielding pattern 128 includes a first sub-pattern 128a and a second sub-pattern 128b, and the first sub-pattern 128a and the second sub-pattern 128b are respectively located on opposite sides of the sensing array, and are correspondingly located above the lead 126. The shielding pattern 128 can not only protect the lead 126 from inductively generating capacitance, but also can be grounded to prevent the touch display module 100 from being subjected to electromagnetic interference (EMI) or electrostatic effect (ESD), and the grounding method is, for example, touch. The ground line of the display module 100 is co-constructed. The material of the shielding pattern 128 may be a metal material or a conductive material such as Indium Tin Oxide (ITO). In the embodiment, the shielding pattern 128 can be a metal material. In the process of the touch display module 100, the shielding pattern 128 and the driving line 122 can be fabricated in different processes. In addition, the shielding pattern 128 may be the same transparent conductive material as the driving line 122, such as ITO. However, the invention is not limited herein. In addition, above the shielding pattern 128, a printing layer (for example, printing black paint, white paint or other color paint) may be disposed, in order to mark the sensing area 120a and the joint area 120b, thereby avoiding the user. The junction area 120b is seen.

In this embodiment, the touch panel 120 further includes a second substrate 129 disposed on the second surface 121b, 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 It is a light-transmitting substrate such as glass or polyethylene terephthalate (PET). Between the first substrate 121 and the second substrate 129, the first substrate 121 and the second substrate 129 can be combined by using an optical glue, and the optical adhesive has a high light transmittance, thereby avoiding the first substrate. The colloid between 121 and the second substrate 129 has an effect on the display image quality. However, the invention is not limited herein.

2 is a top plan view of the touch display module of FIG. 1A. Referring to FIG. 2 , in the 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 are disposed side by side in the bonding region 120b. The first pads 130 are electrically connected to the driving lines 122, respectively. The second pad 132 is disposed on the second substrate 129 and is disposed in the bonding area 120b. The second pad 132 is electrically connected to the sensing line 124. The first substrate 121 has an opening 121c. For both), the second pads 132 are exposed. In detail, the sensing line 124 is electrically connected to the second pad 132 by the lead 126. The leads 126 are distributed on both sides of the sensing line 124, so the second pads 132 are respectively disposed on the second substrate 129. side. On the first pad 130 and the second pad 132, the sensing signals of the self-driving line 122 and the sensing line 124 can be outputted by a flexible circuit board 134.

3 is a schematic diagram of a handheld electronic device using the touch display module of FIG. 1A. Referring 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. The drive line 122 can include a print The brushing process forms a plurality of leads on the first surface 121a with a metal layer such as silver. As far as the current technology is concerned, the line width of the lead portion of each of the driving lines 122 and the pitch of the lead portions of the adjacent driving lines 122 can be as small as 60 μm when the wiring is formed by the printing process. In addition, the sensing line 124 and the lead 126 can be formed on a film material having a metal layer, and a plurality of lines are formed by a photolithography process. In the current technology, the line width of each sensing line 124 and the lead 126, and the minimum spacing (ie, line spacing) of the adjacent sensing lines 124 and leads 126 may be 30 μm (micrometer). In other words, the line width and line pitch of the sensing line 124 and the lead 126 are smaller than the line width and line spacing of the lead portion of the driving line 122. In addition, when the lead portion of the driving line 122 is fabricated by a printing process, and the sensing line 124 and the lead 126 are fabricated by a photolithography process, the surface roughness of the sensing line 124 and the lead 126 is lower than the surface of the lead portion of the driving line 122. Roughness.

In the embodiment, the driving line 122 and the sensing line 124 are strip electrodes. However, the drive line 122 and the sense line 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 of the driving line 122 may extend from the top end 10a of the handheld electronic device 10 to the bottom portion 10b. The second direction D2 extended by the sensing line 124 may be an extending direction from the right side to the left side 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 leads 126 are disposed on both sides of the sensing line 124, and the width of the leads 126 will be affected. In the touch display module 100, the widths of the two sides outside the sensing area 120a. If the lead wires 126 can be fabricated with a small line width and a line pitch, the widths of the two sides outside the sensing region 120a can be effectively reduced, which is advantageous for the narrow bezel design of the handheld electronic device 10.

In summary, the touch display module of the present invention has a shield pattern disposed on the first surface, and a vertical projection on the second surface covers the lead. When the touch display module is touched, the shielding pattern can isolate and protect the lead wires from touching the object and the lead generating capacitors to affect the operation of the handheld electronic device. The shielding pattern not only protects the leads, but also grounds to avoid electrostatic interference or electromagnetic effects. In addition, when the touch display module of the present invention is applied to the handheld electronic device, the second substrate having the lead and the sensing line can further utilize an etching process having a small line width and a pitch to reduce the outside of the sensing area. The width of the sides is advantageous for the narrow bezel design of the handheld electronic device.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

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 area

121‧‧‧First substrate

121a‧‧‧ first surface

121b‧‧‧second surface

121c‧‧‧ openings

122‧‧‧ drive line

124‧‧‧Sensing line

126‧‧‧ lead

128‧‧‧Shield pattern

128a‧‧‧First subpattern

128b‧‧‧Second sub-pattern

129‧‧‧Second substrate

130‧‧‧First mat

132‧‧‧second mat

134‧‧‧Soft circuit board

201‧‧‧External conductor

D1‧‧‧ first direction

D2‧‧‧ second direction

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

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

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

FIG. 3 illustrates a handheld electronic device using the touch display module of FIG. 1A; Schematic diagram of the setting.

100‧‧‧Touch display module

110‧‧‧ display panel

120‧‧‧Touch panel

120a‧‧ Sensing area

120b‧‧‧ junction area

121‧‧‧First substrate

121a‧‧‧ first surface

121b‧‧‧second surface

122‧‧‧ drive line

124‧‧‧Sensing line

126‧‧‧ lead

128‧‧‧Shield pattern

128a‧‧‧First subpattern

128b‧‧‧Second sub-pattern

129‧‧‧Second substrate

Claims (10)

A touch display module includes: a display panel; a touch panel disposed on the display panel, and having a sensing area and a bonding area outside the sensing area, the touch panel comprising: 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 juxtaposed on the first surface, and respectively Extending in a first direction; a plurality of sensing lines are arranged side by side on the second surface, and respectively extending along a second direction, the first direction intersecting the second direction, the driving lines and the sensing lines are formed at a sensing array in the sensing area; a plurality of routing traces disposed on the second surface and located outside the sensing area, the leads are electrically connected to the sensing lines, respectively, and extended The lead wires are respectively located on opposite sides of the sensing array; and a shielding pattern is disposed on the first surface, and a vertical projection of the shielding pattern on the second surface covers the leads, The shield map It comprises a first sub-pattern and a second sub-pattern, are located on opposite sides of the sensing array and positioned above the plurality of leads. The touch display module of claim 1, wherein the first direction of the driving lines is perpendicular to a long axis direction of the bonding area. The touch display module of claim 1, wherein the sensing lines and the surface roughness of the leads are lower than a surface roughness of a lead portion of the driving lines. The touch display module of claim 3, wherein the sensing lines and the leads are formed by a photolithography process, and the lead portions of the driving lines are formed by a printing process. The touch display module of claim 1, wherein each of the sensing lines and each of the leads has a width smaller than a width of the lead portion of each of the driving lines. The touch display module of claim 1, wherein the touch panel further comprises a second substrate disposed on the second surface, and the sensing lines are located on the first substrate and the Between the second substrate. The touch display module of claim 6, wherein the touch panel further comprises: a plurality of first pads on the first surface and side by side in the joint area, the first The pads are respectively electrically connected to the driving lines; and the plurality of second pads are located on the second substrate and are arranged side by side in the bonding area, and the second pads are electrically connected to the sensing layers respectively a test line, wherein the first substrate has an opening to expose the second pads. The touch display module of claim 1, wherein the shielding pattern is grounded. The touch display module of claim 1, wherein the material of the shielding pattern comprises metal. A handheld electronic device comprising: A touch display module according to claim 1, wherein the touch display module is disposed in the display opening.