CN107196634B

CN107196634B - Touch panel assembly and portable electronic device

Info

Publication number: CN107196634B
Application number: CN201610142745.0A
Authority: CN
Inventors: 黄伯勤; 简士博; 廖宇靖; 庄益诚
Original assignee: HTC Corp
Current assignee: HTC Corp
Priority date: 2016-03-14
Filing date: 2016-03-14
Publication date: 2020-12-18
Anticipated expiration: 2036-03-14
Also published as: CN107196634A

Abstract

The invention discloses a touch panel assembly and a portable electronic device. The touch panel assembly comprises a touch panel, a flexible circuit board, an input element and a light-emitting element. The touch panel comprises a plurality of sensing series and a plurality of connecting pads. The pads are disposed in the plurality of bonding areas of the touch panel and electrically connected to the corresponding sensing series respectively. The flexible circuit board comprises a plurality of lapping parts and a light guide part. The overlapping parts respectively extend and connect the joint areas. Each of the bonding portions includes a plurality of terminals electrically connected to the corresponding pad. The light guide part includes a connection end and an extension end. The connecting end is connected with the corresponding lapping part, and the extending end is connected with the connecting end and extends towards the direction far away from the touch panel. The input element is arranged right above the extension end. The luminous element is arranged on the light incident side of the light guide part.

Description

Touch panel assembly and portable electronic device

Technical Field

The present invention relates to a touch panel assembly and a portable electronic device, and more particularly, to a capacitive touch panel assembly and a portable electronic device using the same.

Background

In recent years, with the rapid development and application of information technology, wireless mobile communication and information appliances, many information products have been converted from conventional input devices such as keyboard or mouse to Touch Panel (Touch Panel) as an input device for the purpose of convenience, smaller size and more humanization.

Currently, the industry usually sets a shortcut key or a hot key (hot key) in the peripheral area of the touch panel. Therefore, when a user presses the hot key, the corresponding common function can be quickly started, and the time required by searching and starting the function is further shortened, so that the convenience in use is improved. In addition, in order to make the key have a light emitting characteristic, a backlight module is usually disposed under the key, the backlight module has a light guide plate, and a light source is disposed at one side of the light guide plate to transmit light emitted by the light source to the whole light guide plate to make the key emit light. However, this configuration requires a layer of backlight module, which increases the thickness of the light guide plate, and the cost of the light guide plate is expensive, which makes it difficult to reduce the production cost.

Disclosure of Invention

The present invention is directed to a touch panel assembly and a portable electronic device using the same, which have a small thickness and a low production cost.

To achieve the above object, the touch panel assembly of the present invention includes a touch panel, a flexible printed circuit, at least one input device and at least one light emitting device. The touch panel comprises a plurality of sensing series and a plurality of connecting pads. The connecting pads are arranged in a plurality of connecting areas of the touch panel and are respectively electrically connected with the corresponding sensing serials, wherein the connecting areas are positioned on the side edge of the touch panel. The flexible circuit board comprises a plurality of lap joint parts and at least one light guide part. The overlapping parts respectively extend and connect the joint areas. Each bridging portion includes a plurality of terminals electrically connected to the corresponding pads, respectively. The light guide part includes a connection end and an extension end. The connecting end is connected with the corresponding lapping part, and the extending end is connected with the connecting end and extends towards the direction far away from the touch panel. The input element is arranged right above the extension end. The light emitting element is arranged on the light incident side of the light guide part and is configured to emit light. So that the light enters the light guide portion to illuminate the input element.

The portable electronic device comprises a shell, a display module, a touch panel, a flexible circuit board structure, at least one input element and at least one light-emitting element. The housing has an opening. The host module is arranged in the shell. The display module is arranged in the shell, and the opening exposes the display surface of the display module. The touch panel is configured on the display surface. The touch panel comprises a plurality of sensing series, a plurality of connecting pads and a plurality of connecting pads. The connecting pads are arranged in a plurality of connecting areas of the touch panel and are respectively electrically connected with the corresponding sensing serials, wherein the connecting areas are positioned on the side edge of the touch panel. The flexible circuit board comprises a plurality of lap joint parts and at least one light guide part. The overlapping parts respectively extend and connect the joint areas. Each bridging portion includes a plurality of terminals electrically connected to the corresponding pads, respectively. The light guide part includes a connection end and an extension end. The connecting end is connected with the corresponding lapping part, and the extending end is connected with the connecting end and extends towards the direction far away from the touch panel. The input element is arranged right above the extension end. The light-emitting element is arranged on the light-in side of the light guide part and is configured to emit light rays, so that the light rays enter the light guide part to illuminate the input element.

In an embodiment of the invention, the touch panel further includes a plurality of connection lines, each of which electrically connects the corresponding sensing serial to the corresponding pad.

In an embodiment of the invention, the number of the at least one input element is plural, and the input elements and the bonding regions are substantially staggered from each other along a direction parallel to the side edges.

In an embodiment of the invention, the number of the at least one light guide portion is multiple, and the light guide portions are respectively overlapped with the multiple orthographic projections of the input element.

In an embodiment of the invention, the number of the at least one light emitting element is plural, and the extending ends are respectively located on light paths of plural light rays emitted by the light emitting elements.

In an embodiment of the invention, the flexible circuit board further includes at least one slot, and the slot surrounds the extending end to define the light guide portion.

In an embodiment of the invention, the bonding area is located on a lower surface of the touch panel, and the flexible circuit board is disposed on the lower surface and connected to the bonding area.

In an embodiment of the invention, the touch panel assembly further includes a transparent cover plate covering the touch panel and the flexible circuit board. The light-emitting element is arranged on the lower surface of the transparent cover plate.

In an embodiment of the invention, the touch panel assembly further includes a substrate, and the light emitting device is disposed on the substrate and between the touch panel and the substrate.

In an embodiment of the invention, the flexible circuit board further includes a light guiding film at least covering an upper surface of the light guiding portion.

In an embodiment of the invention, a surface of the light guiding film facing the input element has a plurality of microstructures.

In an embodiment of the invention, the flexible circuit board further includes a substrate layer and a light guiding film, the substrate layer covers the light guiding film and has at least one opening corresponding to the extending end to expose the light guiding film at the extending end.

In an embodiment of the invention, the input element is disposed on the side edge and located between any two adjacent joint regions.

In an embodiment of the invention, the touch panel further includes at least one protrusion protruding from the side edge and located right above the extending end, and the input element is disposed on the protrusion.

In an embodiment of the invention, the touch panel assembly further includes an adhesive layer disposed between the protruding portion and the extending end to bond the protruding portion and the extending end.

The touch panel assembly as described above, wherein the input element is disposed on the extension end.

In an embodiment of the invention, the touch panel assembly further includes a transparent cover plate and an adhesive layer, the transparent cover plate covers the touch panel and the flexible circuit board, and the adhesive layer is disposed between the transparent cover plate and the extending end.

In view of the above, in the touch panel assembly and the portable electronic device using the touch panel assembly of the present invention, the flexible circuit board includes a plurality of overlapping portions and at least one light guide portion, the overlapping portions are used to connect a plurality of pads of the touch panel, and the light guide portion is located between any two adjacent overlapping portions. The light guide part is provided with an extending end which extends towards the direction far away from the touch panel, the input element is arranged right above the light guide part, and the luminous element is arranged at the light incident side of the light guide part, so that light enters the extending end to illuminate the input element on the light guide part. With such a configuration, the touch panel assembly and the portable electronic device using the same of the present invention can provide a uniform backlight effect for the input element without disposing a light guide plate, thereby effectively reducing the overall thickness and further reducing the production cost.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic perspective view of a portable electronic device according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a touch panel according to an embodiment of the invention;

FIG. 3 is a partial schematic bottom view of a touch panel assembly according to an embodiment of the invention;

FIG. 4 is a bottom view of the FPC shown in FIG. 3;

FIG. 5 is a schematic partial cross-sectional view of the touch panel assembly of FIG. 3 taken along line I-I;

FIG. 6 is a schematic partial cross-sectional view of a touch panel assembly according to another embodiment of the invention;

FIG. 7 is a schematic top view of a touch panel assembly according to an embodiment of the invention;

FIG. 8 is a partially exploded view of the touch panel assembly of FIG. 7;

FIG. 9 is a schematic partial cross-sectional view of the touch panel assembly of FIG. 7 taken along line A-A';

FIG. 10 is a schematic partial cross-sectional view of the touch panel assembly of FIG. 7 taken along line B-B';

FIG. 11 is a schematic top view of a touch panel assembly according to an embodiment of the invention;

FIG. 12 is a partially exploded view of the touch panel assembly of FIG. 11;

FIG. 13 is an enlarged, fragmentary schematic view of the touch panel assembly of FIG. 11;

FIG. 14 is a schematic partial cross-sectional view of the touch panel assembly of FIG. 11 taken along line A-A';

FIG. 15 is a partial cross-sectional view of the touch panel assembly of FIG. 11 taken along line B-B'.

Description of the symbols

10: portable electronic device

12: shell body

12 a: opening of the container

14: display module

14 a: display surface

16: transparent cover plate

16a, 16 b: light-transmitting pattern

50: touch panel assembly

100: flexible circuit board

110: lap joint part

112: terminal with a terminal body

112 a: first terminal

112 b: second terminal

112 c: third terminal

120: light guide part

122: connecting end

124: extension end

130: light guide film

140: line concentration part

142: line

150: slotting

160: substrate layer

200: touch panel

210: sensing string

210 a: upper block

210 b: lower block

220: connecting pad

222: first pad group

222 a: first pad

224: second pad set

224 a: second pad

226: third pad set

226 a: third connecting pad

230: connecting wire

232: first connecting wire

234: second connecting line

236: third connecting line

240: projecting part

300: light emitting element

400: substrate

500: input element

510: first input element

520: second input element

530: key pattern

540: key circuit layer

600: transparent cover plate

700: adhesive layer

L1, L2, L3: side edge

OP: opening of the container

P1: optical path

R1, R2, R3: bonding region

S1: sensing region

Detailed Description

Fig. 1 is a perspective view of a portable electronic device according to an embodiment of the invention. Fig. 2 is a schematic diagram of a touch panel according to an embodiment of the invention. Fig. 3 is a partial bottom view of a touch panel assembly according to an embodiment of the invention. Referring to fig. 1 to fig. 3, the portable electronic device 10 of the present embodiment may be a smart phone (smart phone) as shown in fig. 1, but the present embodiment is only for illustration, and in other embodiments, the portable electronic device 10 of the present invention may also be a portable electronic device with a touch function, such as a tablet PC (tablet PC) or an electronic book (eBook). Referring to fig. 1 to fig. 3, the portable electronic device 10 of the present embodiment includes a housing 12, a display module 14, a transparent cover 16, a flexible circuit board 100 and a touch panel 200. The housing 12 has an opening 12a as shown in fig. 1. The display module 14 is disposed in the housing 12, and the opening 12a exposes the display surface 14a of the display module 14. The touch panel 100 shown in fig. 2 can be disposed on the display surface 14a, and the flexible circuit board 100 is suitable for being bent to electrically connect the touch panel 200 and the host module of the portable electronic device 10. The transparent cover 16 is disposed on the touch panel 200 and covers the opening 12a of the housing 12. The transparent cover 16 has at least one light-transmissive pattern 16a, which can be used as a key pattern of the portable electronic device 10.

The touch panel assembly 50 of the present embodiment includes a flexible circuit board 100, a touch panel 200, an input device 500 and at least one light emitting device 300. The touch panel 200 includes a plurality of sensing series 210, a plurality of pads 220, and a plurality of connecting lines 230. The sensing series 210 are disposed in the sensing regions S1 of the touch panel 200, and the pads 220 are disposed outside the sensing regions S1 and electrically connected to the corresponding sensing series 210 through the connecting wires 230. With this configuration, when a user touches the touch panel 200 with a finger, the touch panel 200 generates a capacitance change between the sensing strings at the position touched by the finger, and the capacitance change is converted into a control signal and transmitted to an external circuit, and is processed to output an appropriate command to operate the portable electronic device 10.

In detail, referring to fig. 2, the pads 220 may include a first pad set 222, a plurality of second pad sets 224 and a plurality of third pad sets 226, wherein the first pad set includes a plurality of first pads 222a, the second pad set 224 includes a plurality of second pads 224a, and the third pad set 226 includes a plurality of third pads 226a, and the first pad set 222, the plurality of second pad sets 224 and the plurality of third pad sets 226 are respectively disposed on a plurality of bonding areas R1, R2 and R3 of the touch panel 200. The bonding regions R1, R2, R3 are located at the side L1 of the sensing region S1.

In view of the above, the connection lines 230 may include a plurality of first connection lines 232, a plurality of second connection lines 234 and a plurality of third connection lines 236, wherein the first connection lines 232 are disposed at the side L2 of the touch panel 200 to electrically connect the sensing strings 210 located in the lower block 210b of the touch panel 200 to the corresponding first pads 222a, and the second connection lines 234 are disposed at the side L3 of the touch panel 200 to electrically connect the sensing strings 210 located in the upper block 210a of the touch panel 200 to the corresponding second pads 224 a. Thus, the sensing series 210 is divided into two

blocks

210a, 210b and connected to the

corresponding pads

222a, 224a through the connecting

lines

232, 234 at the two sides L2, L3, respectively, so as to save the wiring space of the connecting

lines

232, 234 on the touch panel 200. Therefore, the size of the touch panel 200 is reduced, and the peripheral frame of the portable electronic device 10 is reduced, thereby enlarging the display area of the portable electronic device 10. Similarly, the third connecting wires 236 are disposed at the side L1 of the touch panel 200 to electrically connect the sensing series 210 at the side L1 to the corresponding third pads 226a, respectively.

In the embodiment, the input element 500 may be disposed on the side L1 of the sensing region S1, and between any two adjacent junction regions R1, R2, and R3, for example, and the input element 500 and the junction regions R1, R2, and R3 are disposed in a staggered manner along a direction parallel to the side L1. The input element 500 may be, for example, a physical key (physical key), a light sensing key (light sensing key), a stress sensing key (stress sensing key) and the like disposed on the portable electronic device 10, and the invention is not limited to the type of the input element 500 and the method for generating the control signal. In the present embodiment, the input element 500 may be a physical key. This input element 500 is different from a Virtual key (Virtual key) displayed by the display. Specifically, the input element 500 may include a first input element 510 and a second input element 520. The first input element 510 and the second input element 520 are respectively located right below the first transparent pattern 16a and the second transparent pattern 16b shown in fig. 1, and the first input element 510 and the second input element 520 can respectively have different functions, such as returning to a previous page or returning to a home screen function. It should be noted that the number of the input elements 500 in the present embodiment is plural, but the present embodiment is only for illustration, and the invention does not limit the number of the input elements 500.

Fig. 4 is a bottom view of the flexible circuit board of fig. 3. FIG. 5 is a partial cross-sectional view of the touch panel assembly of FIG. 3 taken along line I-I. Referring to fig. 3 to fig. 5, in the present embodiment, the flexible circuit board 100 includes a plurality of bonding portions 110 and at least one light guide portion 120 as shown in fig. 3 and fig. 4. The straps 110 extend and are connected to the lands R1, R2, R3, respectively, as shown in fig. 2. As shown in fig. 4, each of the bonding pads 110 includes a plurality of terminals 112 electrically connected to corresponding pads 220. In detail, each of the bonding pads 110 includes a plurality of first terminals 112a, a plurality of second terminals 112b and a plurality of third terminals 112c, the first terminals 112a are electrically connected to the plurality of first pads 222a of the first pad set 222, the second terminals 112b are electrically connected to the plurality of second pads 224a of the second pad set 224, and the third terminals 112c are electrically connected to the plurality of third pads 226a of the third pad set 226. In the present embodiment, the flexible circuit board 100 is disposed on the lower surface of the touch panel 200, and the bonding regions R1, R2, and R3 of the touch panel 200 are correspondingly disposed on the lower surface of the touch panel 200, so that the pads 220 in the bonding regions R1, R2, and R3 are electrically connected to the terminals 112 of the bonding part 110, respectively. Under this configuration, the touch panel 200 of fig. 2 is a perspective display of the elements disposed on the lower surface thereof.

In addition, the flexible circuit board 100 further includes a wire collecting portion 140 and a plurality of wires 142, wherein the wire collecting portion 140 is connected to the connecting portion 110 and extends to the outside of the touch panel 200, and the wires 142 are connected to the first terminal 112a, the second terminal 112b and the third terminal 112c and are collected to the wire collecting portion 140, so as to be electrically connected to a host module of the portable electronic device 10 through the wire collecting portion 140.

In the present embodiment, the light guide part 120 includes a connection end 122 and an extension end 124 connected to each other as shown in fig. 3. The connecting ends 122 are connected to the corresponding connecting portions 110, the extending ends 124 extend toward the light emitting element 300 and away from the touch panel 200 as shown in fig. 5, and the input element 500 is located right above the extending ends 124. In the present embodiment, the number of the light guide portions 120 may be multiple (two are shown, but not limited thereto) corresponding to the number of the input elements 500, and the light guide portions 120 are respectively overlapped with the orthographic projection of the input elements 500. Specifically, the light guide portions 120 are respectively located right below the input elements 500. In the present embodiment, the flexible circuit board 100 further includes at least one slot 150 (two slots are shown, but not limited thereto), and the slots 150 respectively surround the extending ends 124 to define the corresponding light guide portions 120 on the flexible circuit board 100 as shown in fig. 3.

In this embodiment, the flexible circuit board 100 further includes a light guiding film 130 at least covering the upper surface of the light guiding portion 120. For example, the light guiding film 130 can cover the top surface of the flexible circuit board 100 comprehensively instead of the top dielectric layer of the flexible circuit board 100. Of course, the present embodiment is only for illustration and the invention is not limited thereto. In other embodiments, the light guiding film 130 may cover only the upper surface of the light guiding part 120. The light emitting element 300 is disposed on the light incident side of the light guide 120. Specifically, the light emitting device 300 can be disposed on the substrate 400 as shown in fig. 5, and the light emitting device 300 is located between the touch panel 200 and the substrate 400. The light emitting element 300 is configured to emit light (as shown by the dashed lines in fig. 5). The extension 124 is positioned in the light path P1 so that light enters the light directing film 130 on the extension 124 to illuminate the input element 500 above it. In this embodiment, the number of the light emitting elements 300 may be multiple corresponding to the number of the light guide parts 120, and the extending ends 124 of the light guide part 120 are respectively located on the light paths P1 of the light rays emitted by the light emitting elements 300.

The light guide film 130 of the present embodiment may be a transparent film with high refractive index and light transmittance, and the surface of the light guide film 130 may have a plurality of dot-shaped microstructures. Therefore, the light guiding film 130 can utilize the difference of the refractive indexes of the light rays among the media to generate the total reflection phenomenon in the light guiding film 130, and guide the light rays to be emitted from the surface facing the input element 500 through the net-point-shaped microstructures, so as to illuminate the input element 500. With such a configuration, the input device 500 can have a uniform backlight effect without additionally providing a light guide plate.

Fig. 6 is a schematic partial cross-sectional view of a touch panel assembly according to another embodiment of the invention. It should be noted that the touch panel assembly of the present embodiment is similar to the touch panel assembly of fig. 5, and therefore, the present embodiment follows the reference numerals and parts of the foregoing embodiments, wherein the same reference numerals are used to refer to the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and the description of the embodiments is not repeated. Referring to fig. 6, the difference between the touch panel assembly of the present embodiment and the touch panel assembly of fig. 5 will be described.

In the present embodiment, the touch panel assembly further includes a transparent cover 600 covering the flexible circuit board 100 and the touch panel 200, and the light emitting device 300 is disposed on a lower surface of the transparent cover 600. The extending end 124 faces the light emitting device 300 and is located on the light path P1 of the light emitted from the light emitting device 300. Thus, the light emitted from the light emitting device 300 can enter the light guiding film 130 on the extending end 124 to illuminate the input device 500.

Fig. 7 is a schematic top view of a touch panel assembly according to an embodiment of the invention. It should be noted that the touch panel assembly of the present embodiment is similar to the touch panel assembly of fig. 6, and therefore, the present embodiment follows the reference numerals and parts of the foregoing embodiments, wherein the same reference numerals are used to refer to the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and the description of the embodiments is not repeated. The differences between the touch panel assembly of the present embodiment and the touch panel assembly of fig. 6 will be described.

FIG. 8 is a partially exploded view of the touch panel assembly of FIG. 7. It should be noted that, for simplicity, the circuit layout on the touch panel 200 of fig. 7 and 8 is only schematically illustrated, and the transparent cover 600 is omitted in fig. 8. Referring to fig. 7 and fig. 8, in the present embodiment, the touch panel 200 further includes at least one protrusion 240 protruding from a side of the touch panel 200 and located right above the extending end 124 of the flexible circuit board 100, and the input device 500 is disposed on the protrusion 240. In other words, the orthographic projection of the protrusion 240 overlaps the extending end 124 of the flexible circuit board 100, and the input element 500 is disposed on the protrusion 240. In the present embodiment, the protrusion 240 may protrude from an edge of the touch panel 200 as shown in fig. 8, and is not arranged in line with the bonding regions R1, R2, and R3.

FIG. 9 is a partial cross-sectional view of the touch panel assembly of FIG. 7 taken along line A-A'. FIG. 10 is a partial cross-sectional view of the touch panel assembly of FIG. 7 taken along line B-B'. Referring to fig. 9 and fig. 10, in the present embodiment, the touch panel assembly 50 further includes a transparent cover 600 covering the touch panel 200 and the flexible circuit board 100, and the light emitting device 300 is disposed on a lower surface of the transparent cover 600. Further, the flexible circuit board 100 may further include a substrate layer 160 and a light guiding film 130 as shown in fig. 10, wherein the substrate layer 160 covers the light guiding film 130, and the substrate layer 160 has at least one opening OP corresponding to the extending end 124 to expose the light guiding film 130 at the extending end 124. Thus, the protrusion 240 provided with the input element 500 can extend to the upper side of the extending end 124 through the opening OP, and the surface of the light guiding film 130 can further have a plurality of microstructures 132, so that the light entering the light guiding film 130 can be diffused or reflected by the microstructures 132, and further the light is emitted from the surface facing the input element 500, so as to illuminate the input element 500.

Under this configuration, the light emitting device 300 can be disposed on the flexible circuit board 100 facing the extending end 124 and disposed on the transparent cover 600 through the flexible circuit board 100. Thus, the light emitting element 300 can be disposed on the light incident side of the light guide part 120 as shown in fig. 9, and the emitted light can enter the light guide film 130 through the light incident side, and the light is emitted from the surface facing the input element 500 through the microstructures 132, so as to illuminate the input element 500 located right above. In addition, in the present embodiment, the touch panel assembly 50 further includes an adhesive layer 700, which can be disposed between the protruding portion 240 and the extending end 124 as shown in fig. 10, so as to adhere the protruding portion 240 and the extending end 124.

Fig. 11 is a schematic top view of a touch panel assembly according to an embodiment of the invention. It should be noted that the touch panel assembly of the present embodiment is similar to the touch panel assembly of fig. 5, and therefore, the present embodiment follows the reference numerals and parts of the foregoing embodiments, wherein the same reference numerals are used to refer to the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and the description of the embodiments is not repeated. The differences between the touch panel assembly of the present embodiment and the touch panel assembly of fig. 5 will be described.

FIG. 12 is a partially exploded view of the touch panel assembly of FIG. 11. Fig. 13 is a partially enlarged schematic view of the touch panel assembly of fig. 11. It should be noted that, for simplicity, the circuit layout on the touch panel 200 of fig. 11 and 12 is only schematically illustrated, and the transparent cover 600 is omitted from fig. 12. Referring to fig. 11 to fig. 13, in the present embodiment, the input element 500 is disposed on the extending end 124 of the flexible circuit board 100. In detail, the flexible circuit board 100 may include a substrate layer 160 and a light guiding film 130 similar to the previous embodiment, wherein the substrate layer 160 covers the light guiding film 130, and the substrate layer 160 has at least one opening OP corresponding to the extending end 124 to expose the light guiding film 130 at the extending end 124. In this embodiment, the input element 500 may include a key pattern 530 and a key circuit layer 540, the key pattern 520 may be disposed on the light exit surface of the light guide film 130, and the key circuit layer 540 may surround the key pattern 520 and be located between the substrate layer 160 and the light guide film 130. Of course, the present embodiment is only for illustration, and the invention is not limited to the structure and circuit configuration of the input device 500. In addition, the light guiding film 130 may have a plurality of microstructures 132, so that the light entering the light guiding film 130 can be diffused or reflected by the microstructures 132, and further the light is emitted from the surface facing the input element 500, so as to illuminate the input element 500.

FIG. 14 is a partial cross-sectional view of the touch panel assembly of FIG. 11 taken along line A-A'. FIG. 15 is a partial cross-sectional view of the touch panel assembly of FIG. 11 taken along line B-B'. Referring to fig. 14 and fig. 15, in the present embodiment, the touch panel assembly further includes a transparent cover 600 and an adhesive layer 700, wherein the transparent cover 600 covers the touch panel 200 and the flexible circuit board 100, and the adhesive layer 700 is disposed between the transparent cover 600 and the extending end 124. In detail, since the substrate layer 160 of the flexible circuit board 100 has an opening OP corresponding to the extension end 124 to expose the light guiding film 130 therebelow, the adhesive layer 700 can be filled in the opening OP to adhere the transparent cover plate 600 and the extension end 124. Under this configuration, the light emitting device 300 can be disposed on the flexible circuit board 100 facing the extending end 124 and disposed on the transparent cover 600 through the flexible circuit board 100. Thus, the light emitting element 300 can be disposed on the light incident side of the light guiding film 130 as shown in fig. 14, and the emitted light can enter the light guiding film 130 through the light incident side, and the light is emitted from the surface facing the input element 500 through the microstructures 132, so as to illuminate the input element 500 located right above.

In summary, the flexible circuit board in the touch panel assembly and the portable electronic device of the present invention includes a plurality of bridging portions and at least one light guide portion, the bridging portions are used to connect the plurality of pads of the touch panel, and the light guide portion is located between any two adjacent bridging portions. The light guide part is provided with an extending end which extends towards the direction far away from the touch panel and is positioned right below the input element, and the luminous element is arranged on the light inlet side of the light guide part, so that light enters the extending end of the light guide part and is emitted to the surface of the input element from the extending end to illuminate the input element. With such a configuration, the touch panel assembly and the portable electronic device using the same of the present invention can provide a uniform backlight effect for the input element without disposing a light guide plate, thereby effectively reducing the overall thickness and further reducing the production cost.

Although the present invention has been described in conjunction with the above embodiments, it is not intended to limit the present invention, and those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention should be limited only by the appended claims.

Claims

1. A touch panel assembly, comprising:

a touch panel comprising:

a plurality of sensing strings; and

the connecting pads are arranged in a plurality of connecting areas of the touch panel and are respectively electrically connected with the corresponding sensing serials, wherein the connecting areas are positioned on the side edge of the touch panel;

a flexible circuit board, comprising:

a plurality of bridging portions respectively extending and connecting the bonding regions, each bridging portion including a plurality of terminals respectively electrically connected to the corresponding bonding pads;

at least one light guide part, including a connection end and an extension end, wherein the connection end is connected with the corresponding lap joint part, and the extension end is connected with the connection end and extends towards the sensing serials far away from the touch panel; and

the light guide film directly covers the whole upper surface of the flexible circuit board;

at least one input element arranged right above the extending end; and

at least one light-emitting element arranged at the light-incident side of the light guide part and configured to emit light so that the light enters the light guide part to illuminate the input element.

2. The touch panel assembly of claim 1, wherein the touch panel further comprises a plurality of connecting wires electrically connecting the sensing strings to the pads respectively.

3. The touch panel assembly of claim 1, wherein the number of the at least one input element is plural, and the input elements and the bonding areas are substantially staggered from each other along a direction parallel to the side.

4. The touch panel assembly of claim 3, wherein the at least one light guide portion is plural in number, and the light guide portions are respectively overlapped with the orthographic projections of the input elements.

5. The touch panel assembly of claim 4, wherein the at least one light-emitting device is plural in number, and the extending ends are respectively located on light paths of plural light beams emitted by the light-emitting devices.

6. The touch panel assembly of claim 1, wherein the flexible circuit board further comprises at least one slot surrounding the extended end to define the light guide portion.

7. The touch panel assembly of claim 1, wherein the bonding pads are disposed on a lower surface of the touch panel, and the flexible circuit board is disposed on the lower surface and connected to the bonding pads.

8. The touch panel assembly of claim 1, further comprising a transparent cover covering the touch panel and the flexible printed circuit board, wherein the light emitting device is disposed on a lower surface of the transparent cover.

9. The touch panel assembly of claim 1, further comprising a substrate, the light emitting device being disposed on the substrate and between the touch panel and the substrate.

10. The touch panel assembly of claim 1, wherein the flexible printed circuit further comprises a light guide film at least covering the upper surface of the light guide portion.

11. The touch panel assembly of claim 10, wherein the light directing film has a plurality of microstructures.

12. The touch panel assembly of claim 1, wherein the flexible circuit board further comprises a substrate layer covering the light guiding film and having at least one opening corresponding to the extending end to expose the light guiding film at the extending end.

13. The touch panel assembly of claim 12, wherein the light directing film has a plurality of microstructures.

14. The touch panel assembly of claim 1, wherein the input element is disposed on the side edge between any two adjacent bonding areas.

15. The touch panel assembly of claim 1, wherein the touch panel further comprises at least one protrusion protruding from the side and located directly above the extension, and the input device is disposed on the protrusion.

16. The touch panel assembly of claim 15, further comprising an adhesive layer disposed between the protrusion and the extension to bond the protrusion and the extension.

17. The touch panel assembly of claim 1, wherein the input element is disposed on the extended end.

18. The touch panel assembly of claim 17, further comprising a transparent cover plate covering the touch panel and the flexible circuit board, and an adhesive layer disposed between the transparent cover plate and the extending end.

19. A portable electronic device, comprising:

a housing having an opening;

the display module is arranged in the shell, and the display surface of the display module is exposed out of the opening; and

the touch panel assembly of claim 1, wherein the touch panel is disposed on the display surface.