CN110554811A - Touch panel with narrow frame - Google Patents
Touch panel with narrow frame Download PDFInfo
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- CN110554811A CN110554811A CN201810537694.0A CN201810537694A CN110554811A CN 110554811 A CN110554811 A CN 110554811A CN 201810537694 A CN201810537694 A CN 201810537694A CN 110554811 A CN110554811 A CN 110554811A
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- electrode
- transparent conductive
- touch panel
- electrode bar
- electrode strip
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention provides a touch panel which comprises a plurality of electrode strip groups, a plurality of transparent leads and a plurality of electrode serial groups. The electrode bar group comprises a first electrode bar group and a second electrode bar group, and the first electrode bar group is positioned between the second electrode bar group and the pad area. The transparent wires are arranged in the light-transmitting area, the transparent wires electrically connected to the first electrode strip group and the second electrode strip group respectively comprise a zigzag line segment, and the length of the zigzag line segment electrically connected to the first electrode strip group is longer than that of the zigzag line segment electrically connected to the second electrode strip group. The electrode serial groups are staggered with the electrode strip groups.
Description
Technical Field
the present invention relates to a touch panel, and more particularly, to a touch panel with a narrow frame.
Background
Because the touch display device composed of the display and the touch panel can simultaneously realize touch and display functions, the touch display device has the characteristic of human-computer interaction, and is widely applied to electronic products such as smart phones (smart phones), satellite navigation systems (GPSnavigator systems), tablet PCs (tablet PCs) and notebook PCs (laptop PCs). The mutually-capacitive touch panel has become a mainstream touch technology in the industry at present due to its advantages of high accuracy, multi-touch, high durability, high touch resolution, and the like.
The mutual capacitance type touch technology detects the change of the static electricity on the touch object and the coupling capacitance generated by the touch unit when the touch object is adjacent to or contacted with the touch unit on the touch panel, thereby judging the touch event. The mutual capacitance touch technology can be divided into two types, i.e., a single-layer electrode structure and a double-layer electrode structure, in terms of structural design. Because the double-layer electrode structure is simpler in structural design and control algorithm than the single-layer electrode structure, the double-layer electrode structure is generally applied to middle-high-order consumer electronic products. In the design of the conventional double-layer electrode structure, the sensing serial and the driving serial respectively extend along the horizontal direction and the vertical direction, and the wires connecting the sensing serial must be connected with the sensing serial from both sides of the sensing serial. Therefore, the range of the peripheral area on the two horizontal sides of the touch panel is limited by the number of the wires and cannot be reduced. Therefore, how to continuously reduce the width of the frame of the touch panel, even to achieve the frame-free frame, is still the direction of continuous efforts of those skilled in the art.
Disclosure of Invention
one objective of the present invention is to provide a touch panel to reduce the width of the frame, so as to improve the visual effect.
To achieve the above object, the present invention discloses a touch panel having a transparent area and an opaque area, wherein the opaque area includes a pad area located on a first side of the transparent area, and the touch panel includes a plurality of electrode bar sets, a plurality of first transparent wires and a plurality of electrode serial sets. The electrode strip groups are respectively arranged in the light-transmitting area along a first direction, wherein the electrode strip groups comprise a first electrode strip group and a second electrode strip group, and the first electrode strip group is positioned between the second electrode strip group and the pad area. The first transparent conducting wires are arranged in the light-transmitting area, each first transparent conducting wire comprises a resistance adjusting part, each resistance adjusting part is connected to one end of one of the electrode strip groups, the resistance adjusting parts electrically connected to the first electrode strip group and the second electrode strip group respectively comprise a zigzag line section, and the length of the zigzag line section electrically connected to the first electrode strip group is longer than that of the zigzag line section electrically connected to the second electrode strip group. The electrode serial groups are respectively arranged in the light-transmitting areas along a second direction different from the first direction, and the electrode serial groups and the electrode strip groups are staggered.
In the touch panel of the present invention, the transparent conductive lines formed of the transparent conductive material are used to electrically connect the electrode strip groups, so that the transparent conductive lines can be disposed in the transparent region, thereby increasing the width of the transparent region, and reducing the number of the opaque conductive lines disposed on the left and right sides of the transparent region, thereby reducing the width of the opaque region and reducing the frame width of the touch panel. In addition, since the transparent wires made of the transparent conductive material are likely to have significantly different equivalent resistances due to different lengths, so that the equivalent resistances of the transparent wires are significantly different, in the touch panel of the present invention, by designing the length of the meander line segment of the transparent wire connecting the electrode strip groups closer to the first side and/or the second side of the light-transmitting region to be longer than the length of the meander line segment of the transparent wire connecting the electrode strip groups farther from the first side and/or the second side of the light-transmitting region, the equivalent resistance difference of the lead portions in the transparent wires can be compensated, thereby making the equivalent resistances of the transparent wires uniform.
Drawings
Fig. 1 is a schematic view of a touch display device to which the touch panel of the present invention is applied.
Fig. 2 is a schematic top view illustrating a touch panel according to a first embodiment of the invention.
FIG. 3 is a schematic top view of a transparent conductive line connected to an upper electrode bar set according to a first embodiment of the present invention.
FIG. 4 is a schematic top view of a transparent conductive line connected to a lower electrode strip set according to a first embodiment of the present invention.
Fig. 5 shows a schematic cross-sectional view along the cross-sectional line a-a' of fig. 4.
Fig. 6 is a schematic top view illustrating an electrode strip group and an electrode serial group in a touch area according to a first embodiment of the invention.
Fig. 7 is an enlarged schematic view of the touch panel according to the first embodiment of the invention corresponding to the region R of fig. 2 spanning the touch region, the peripheral region and the opaque region.
Fig. 8 is a schematic diagram illustrating the position of the sensing amount sensed by the touch unit when the touch position of the user is located on the first transparent conductive line.
Fig. 9 is a schematic top view illustrating a touch panel according to a second embodiment of the invention.
Fig. 10 is a schematic top view illustrating a touch panel according to a third embodiment of the invention.
Description of the symbols
TP, TP1, TP2, TP3 touch panel DD display device
DS display surface of TD touch display equipment
TR light-transmitting region OR light-opaque region
S1 first side S2 second side
S3 third side S4 fourth side
Sub substrate SL shielding layer
TL touch layer AL1, AL2 adhesion layer
RT touch control area RP peripheral area
PR pad area ELM electrode strip group
ELM1 first electrode strip group ELM2 second electrode strip group
ELM3 third electrode strip group ELM4 fourth electrode strip group
ELM5 fifth electrode strip group ELM6 sixth electrode strip group
ESS electrode series group D1 first direction
D2 second direction Z top view direction
TT1, TT1a, TT1b first transparent conductor TT2 second transparent conductor
PT Upper portion PB lower portion
P2 resistance adjustment part of P1 lead part
P2L zigzag line segment P21 first stripe line segment
Block P23 for P22 second strip line
OT1 first opaque conductor OT2 second opaque conductor
OT3 third opaque wire BP pad
GT ground trace TL1 first transparent conductive layer
OL opaque conductive layer EL electrode strip
ES1 series of first electrodes ES2 series of second electrodes
CS1 first connection segment CS2 second connection segment
EM electrode group E electrode
TU, TU1, TU2 and TU3 touch unit ELA electrode parts
ELA1 strip part ELB shielding part
TO touch object
Detailed Description
In order to make those skilled in the art understand the present invention, the following embodiments are specifically illustrated and described in detail with reference to the accompanying drawings. It should be noted that the drawings are simplified schematic diagrams, and therefore, only the elements and combinations of the elements and the combinations related to the present invention are shown to provide a clearer description of the basic architecture of the present invention, and the actual elements and layout may be more complicated. For convenience of description, the elements shown in the drawings are not necessarily drawn to scale, and the specific scale may be adjusted according to design requirements.
Referring to fig. 1, a schematic diagram of a touch display device applying a touch panel of the present invention is shown. As shown in fig. 1, the touch panel TP of the present invention can be applied to a display device DD to form a touch display device TD. The touch panel TP may be disposed on the display surface DS of the display device DD for providing a touch sensing function. The touch panel TP may have a transparent region TR and an opaque region OR, wherein the transparent region TR may allow light to pass through and thus corresponds to the display region DS of the display device DD to allow a user to view a picture displayed by the display device DD from the touch panel TP in the transparent region TR, and the opaque region OR may block light from passing through, so that the touch panel TP in the opaque region OR may be used to shield opaque lines in the touch panel TP and peripheral lines and frames not used for displaying pictures in the display device DD. In one embodiment, the opaque region OR may surround the transparent region TR, but the invention is not limited thereto. In another embodiment, when both sides (e.g., left and right sides) of the touch panel TP are borderless, the opaque region OR may be located only on at least one of the first side S1 (e.g., upper side) and the second side S2 (e.g., lower side) of the transparent region TR.
The touch panel TP may include a substrate Sub, a shielding layer SL disposed on the substrate Sub to define an opaque region OR, and a touch layer TL having an opening to define a transparent region TR. The substrate Sub may be an outermost substrate of the touch display device TD, and may include a hard substrate or a soft substrate, such as a glass substrate, a strengthened glass substrate, a quartz substrate, a sapphire substrate, a hard cover sheet (cover lens), a plastic substrate, a soft cover sheet, a soft plastic substrate, or a thin glass substrate. The touch layer TL is disposed on the substrate Sub and has a touch sensing function. The touch layer TL may include, but is not limited to, a first transparent conductive layer and a second transparent conductive layer for touch sensing, and an opaque conductive layer electrically connected thereto. In the embodiment, the touch layer TL can be, for example, a film formed with a touch element, one side surface of which can be adhered to the substrate Sub through an adhesive layer AL1, and the other side surface of which can be adhered to the display device DD through another adhesive layer AL2, but is not limited thereto. Those skilled in the art should understand that the touch layer TL can also be directly formed on the substrate Sub or the display device DD, and will not be described herein. The application of the touch panel TP of the present invention is not limited to that shown in fig. 1, and can be applied to other types of devices.
Fig. 2 is a schematic top view of a touch panel according to a first embodiment of the invention. As shown in fig. 2, the transparent region TR may include a touch region RT and two peripheral regions RP, where a portion of the touch panel TP1 located in the touch region RT has a touch sensing function and a portion located in the peripheral region RP has no touch sensing function. The opaque region OR may include a pad region PR on the first side S1 of the transparent region TR for disposing a pad BP, wherein the pad BP may be electrically connected to a driving device controlling the touch panel TP 1.
In the present embodiment, the touch panel TP1 is located in the touch region RT, and the portion having the touch sensing function may include a plurality of electrode bar sets ELM, a plurality of first transparent conductive wires TT1 and a plurality of electrode serial sets ESS disposed on the substrate Sub in the transparent region TR. Each electrode strip set ELM extends along a first direction D1, and each electrode serial set ESS extends along a second direction D2 different from the first direction D1, so that each electrode serial set ESS can be insulated and interlaced with each electrode strip set ELM to generate capacitive coupling, thereby enabling the touch panel TP1 to have a touch sensing function. In order to make the electrode strip set ELM and the electrode serial set ESS have light transmittance, the electrode strip set ELM can be formed by a first transparent conductive layer, and the electrode serial set ESS can be formed by a second transparent conductive layer. The first transparent conductive layer and the second transparent conductive layer may respectively include a transparent conductive material, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Antimony Tin Oxide (ATO), Antimony Zinc Oxide (AZO), nano silver, or other suitable transparent conductive materials. For example, the first transparent conductive layer and the second transparent conductive layer can be formed on two different films respectively, and the two films are bonded together through the adhesive layer, so that the first transparent conductive layer and the second transparent conductive layer are electrically insulated through the films as the insulating layers, but the invention is not limited thereto.
Each of the first transparent conductive wires TT1 is connected to one end of one electrode bar set ELM, respectively, for electrically connecting each electrode bar set ELM to a corresponding pad BP. The first transparent conductive line TT1 and the electrode bar set ELM of the present embodiment may be formed by the same first transparent conductive layer, but are not limited thereto. In another embodiment, the first transparent conductive wires TT1 and the electrode bar sets ELM may be formed of different transparent conductive layers. Since each of the first transparent conductive lines TT1 is formed of a transparent conductive material, it does not affect the display of the picture, and can be located in the light transmissive region TR, that is, the first transparent conductive line TT1 is located in the display region DS of the display device DD in the top view direction Z. In addition, since the first transparent conductive wires TT1 for electrically connecting each electrode bar set ELM to the pads BP can be disposed in the transparent region TR, the number of the opaque conductive wires disposed in the opaque region OR of the third side S3 (e.g., left side) and the fourth side S4 (e.g., right side) of the transparent region TR can be reduced, and thus the width of the opaque region OR can be reduced, thereby reducing the frame width of the touch panel TP 1.
In the present embodiment, the electrode strip set ELM is divided into an upper portion PT and a lower portion PB. The first transparent conductive wire TT1 connected to each electrode bar group ELM in the upper portion PT extends from one end of the corresponding electrode bar group ELM to the first side S1 of the light transmission region TR; and the first transparent conductive line TT1 connected to each electrode bar group ELM in the lower portion PB extends from one end of the corresponding electrode bar group ELM to a second side S2 of the light-transmitting region TR opposite to the first side S1. Accordingly, each of the first transparent conductive wires TT1 extends to the opaque region OR with the shortest length, thereby having a lower equivalent resistance. Taking 14 electrode bar groups ELM as an example, 8 electrode bar groups ELM counted from the first side S1 of the light-transmitting region TR can be regarded as the upper portion PT, and the remaining 6 electrode bar groups ELM can be regarded as the lower portion PB, but the invention is not limited thereto. Please refer to fig. 3 and fig. 4. Fig. 3 is a schematic top view of a transparent conductive wire TT1 connected to an upper part of the PT electrode strip set ELM according to the first embodiment of the present invention, and fig. 4 is a schematic top view of a transparent conductive wire TT1 connected to a lower part of the PB electrode strip set ELM according to the first embodiment of the present invention. As shown in fig. 3 and 4, for example, the electrode bar sets ELM may include a first electrode bar set ELM1, a second electrode bar set ELM2, a third electrode bar set ELM3 and a fourth electrode bar set ELM4, the first electrode bar set ELM1 and the second electrode bar set ELM2 are located in the upper portion PT, the first electrode bar set ELM1 is located between the second electrode bar set ELM2 and the pad region PR, that is, the first electrode bar set ELM1 is located adjacent to the pad region PR than the second electrode bar set ELM2, and the first transparent conductive wire TT1 connected to the first electrode bar set ELM1 and the second electrode bar set ELM2 extends to the second side of the light-transmitting region TR. The third electrode strip group ELM3 and the fourth electrode strip group ELM4 are positioned in the lower portion PB, the third electrode strip group ELM3 is closer to the second side S2 of the light-transmitting region TR than the first side S1, the fourth electrode strip group ELM4 is positioned between the third electrode strip group ELM3 and the second side S2 of the light-transmitting region TR, and the first transparent wire TT1 connected to the third electrode strip group ELM3 and the fourth electrode strip group ELM4 extends to the second side S2 of the light-transmitting region TR.
each of the first transparent wires TT1 may include a lead portion P1 located in the light-transmitting region TR. Each lead portion P1 extends from one end near the corresponding electrode strip group ELM into the opaque region OR. In order to electrically connect the first transparent wires TT1 to the electrode bar sets ELM at different positions, the lengths of the lead portions P1 need to be different from each other. The resistivity of the transparent conductive material is significantly higher compared to the metallic material, and the lead portion P1 made of the transparent conductive material tends to have a significantly different equivalent resistance depending on the length. In order to equalize the equivalent resistance of each first transparent conductive wire TT1, each first transparent conductive wire TT1 of the present embodiment may further include a resistance adjustment portion P2, and the difference in the equivalent resistance of each lead portion P1 is compensated by the difference in the length of each resistance adjustment portion P2. The resistance adjustment portion P2 of the present embodiment is connected between one end of the lead portion P1 and one end of the corresponding electrode strip set ELM, but not limited thereto.
With respect to the first transparent conductive line TT1 connected to the electrode bar group ELM of the upper portion PT, since it is the first side S1 extending to the light transmission region TR where the pad region PR is disposed, the length of the lead portion P1 connected to the electrode bar group ELM closer to the pad region PR may be shorter than the length of the lead portion P1 connected to the first transparent conductive line TT1 of the electrode bar group ELM farther from the pad region PR. In order to compensate for the difference in equivalent resistance between the plurality of lead portions P1 of the upper portion PT, the length of the resistance adjustment portion P2 connected to the electrode strip group ELM closer to the pad region PR is longer than the length of the resistance adjustment portion P2 connected to the electrode strip group ELM farther from the pad region PR. As for the first transparent conductive line TT1 of the electrode strip set ELM connected to the lower portion PB, since it extends to the second side S2 of the light-transmitting region TR, the length of the lead portion P1 connected to the electrode strip set ELM closer to the second side S2 of the light-transmitting region TR is shorter than the length of the lead portion P1 connected to the first transparent conductive line TT1 of the electrode strip set ELM farther from the second side S2 of the light-transmitting region TR. In order to compensate for the difference in equivalent resistance between the plurality of lead portions P1 of the lower portion PB, the length of the resistance adjustment portion P2 connected to the electrode strip group ELM closer to the second side S2 of the light-transmitting region TR is longer than the length of the resistance adjustment portion P2 connected to the electrode strip group ELM farther from the second side S2 of the light-transmitting region TR. Therefore, the sum of the equivalent resistances of the lead part P1 corresponding to each first transparent conducting wire TT1 and the resistance adjusting part P2 can be close to be consistent, so as to reduce the difference of the equivalent resistances of the first transparent conducting wires TT 1. That is, the equivalent resistance of each of the first transparent conductive lines TT1 can be equalized, thereby reducing the phenomenon of non-uniformity of the touch signal caused by the difference in the equivalent resistance of the first transparent conductive lines TT 1. For example, in the upper part PT, the length of the lead portion P1 of the first transparent conductive wire TT1 connected to the first electrode bar group ELM1 is shorter than the length of the lead portion P1 of the first transparent conductive wire TT1 connected to the second electrode bar group ELM2, and the length of the resistance adjustment portion P2 connected to the first electrode bar group ELM1 is longer than the length of the resistance adjustment portion P2 connected to the second electrode bar group ELM 2. In the lower portion PB, the length of the lead portion P1 of the first transparent conductive wire TT1 connected to the third electrode bar group ELM3 is shorter than the length of the lead portion P1 of the first transparent conductive wire TT1 connected to the fourth electrode bar group ELM4, and the length of the resistance adjustment portion P2 connected to the third electrode bar group ELM3 is longer than the resistance adjustment portion P2 connected to the fourth electrode bar group ELM 4.
In this embodiment, the resistance adjustment portion P2 may include a curved line segment P2L, such as a serpentine (serpentine) segment, and the length of the resistance adjustment portion P2 may be changed by adjusting the length of the curved line segment P2L. Accordingly, the length of the meander line segment P2L electrically connected to the upper PT electrode strip set ELM may be longer as the electrode strip set ELM is closer to the pad region PR, and the length of the meander line segment P2L electrically connected to the lower PB electrode strip set ELM may be longer as the electrode strip set ELM is closer to the pad region PR. Further, each of the meander line segments P2L may include at least one first stripe line segment P21. When the zigzag line P2L includes a plurality of first bar segments P21, the first bar segments P21 may be parallel to each other, for example, extend along the second direction D2, respectively, and the zigzag line P2L may further include at least one second bar segment P22 connecting the first bar segments P21. The second strip line segment P22 extends in a direction different from the second direction D2, for example, in the first direction D1. Each resistance adjustment portion P2 may further include a block portion P23 connected between one end of the meander line segment P2L and one end of the corresponding electrode strip set ELM, and the meander line segment P2L and the block portion P23 may constitute a resistance adjustment portion P2. Since the width of the block portion P23 in the second direction D2 is larger than the line width of the meander line segment P2L, the equivalent resistance of the resistance adjustment portion P2 can be mainly determined by the equivalent resistance of the meander line segment P2L. Therefore, the length of the differential meander line segment P2L can compensate the difference of the equivalent resistance of the lead portion P1, so as to uniformize the equivalent resistance of the first transparent conductive line TT 1.
In the present embodiment, the widths of the resistance adjustment portions P2 in the first direction D1 may be the same as each other, and thus the width of the block portion P23 connected to the electrode bar group ELM closer to the pad region PR in the first direction D1 is smaller than the width of the block portion P23 connected to the electrode bar group ELM farther from the pad region PR in the first direction D1. Specifically, each of the resistance adjustment portions P2 can form the meander line segment P2L and the block portion P23 by forming the slit SL in the block-shaped conductive material by cutting, for example, laser cutting, through the block-shaped conductive material having the same size. The length and number of the first stripe line segments P21 can be determined by the length and number of the slits SL, so as to manufacture the desired length of the zigzag line segment P2L. The equivalent resistance of each of the meander lines P2L can be adjusted by the length and width of the first strip P21 and the length and width of the second strip P22. For example, each of the first stripe segments P21 may have the same width, and each of the second stripe segments P22 may have the same width and length, so that when the number and length of the first stripe segments P21 of each of the resistance adjustment portions P2 are designed to be different and/or the number of the second stripe segments P22 of each of the resistance adjustment portions P2 is designed to be different, the lengths of the meander line segments P2L may be different, so as to achieve the difference of the equivalent resistances.
In the present embodiment, for the upper portion PT, the line width of the lead portion P1 connected to the electrode bar group ELM (e.g., the first electrode bar group ELM1) closer to the pad region PR is smaller than the line width of the lead portion P1 connected to the electrode bar group ELM (e.g., the second electrode bar group ELM2) farther from the pad region PR, so as to uniformize the equivalent resistance of each transparent conductive line by the line width difference of the lead portion P1 and the length difference of each resistance adjusting portion P2. Similarly, for the lower portion PB, the line width of the lead portion P1 connected to the electrode bar group ELM (e.g., the third electrode bar group ELM3) closer to the second side S2 of the light transmission region TR may be smaller than the line width of the lead portion P1 connected to the electrode bar group ELM (e.g., the fourth electrode bar group ELM4) farther from the second side S2 of the light transmission region TR, but the present invention is not limited thereto. In another embodiment, the line widths of some or all of the lead portions P1 may be the same as each other.
In the present embodiment, the resistance adjustment portion P2 connected to the first transparent conductive line TT1 of the electrode strip group ELM located at the center of the light-transmitting region TR has no meander line segment, and the length of the lead portion P1 of this first transparent conductive line TT1 is longer than the length of the lead portions P1 of the other first transparent conductive lines TT 1. Since the first transparent conductive line TT1 of the electrode bar set ELM connected to the upper and lower portions PT and PB may extend to the first and second sides S1 and S2 of the light-transmitting region TR, respectively, the equivalent resistance of the lead portion P1 connected to the first transparent conductive line TT1 of the electrode bar set ELM positioned at the center of the light-transmitting region TR may be greater than the equivalent resistance of the lead portion P1 of the other first transparent conductive lines TT 1. In the case of uniformizing the equivalent resistance of each of the first transparent conductive lines TT1, the equivalent resistance of each of the transparent conductive lines TT1 can be effectively reduced through the design that the first transparent conductive line TT1 connected to the electrode strip set ELM located at the center of the light-transmitting region TR does not have a meander line segment. For example, the electrode bar set ELM may further include at least a sixth electrode bar set ELM6, and the first electrode bar set ELM1 and the second electrode bar set ELM2 are located between the sixth electrode bar set ELM6 and the pad region PR. In this embodiment, the sixth electrode bar set ELM6 may be the electrode bar set ELM located in the center of the light-transmitting region TR. For example, the electrode strip groups ELM may include two sixth electrode strip groups ELM6, and the sixth electrode strip group ELM6 is the two electrode strip groups ELM that are most adjacent to the lower portion PB in the upper portion PT, but is not limited thereto. The first transparent wire TT1 connected to the sixth electrode bar group ELM6 may include a lead portion P1 and a block portion P23, and one end of the lead portion P1 is directly connected in contact with the block portion P23. The width of the block part P23 in the first direction D1 may be the same as the width of the resistance adjustment part P2 of the other first transparent conductive wire TT1 in the first direction D1. In another embodiment, the resistance adjustment portion P2 of the first transparent conductive line TT1 connected to the sixth electrode bar group ELM6 may also have a meander line segment P2L.
In the embodiment, as shown in fig. 2, the first transparent conductive line TT1 is divided into a first transparent conductive line TT1a and a first transparent conductive line TT1b, and the first transparent conductive line TT1a and the first transparent conductive line TT1b are respectively located at two opposite sides (left and right sides) of the electrode strip set ELM. In the present embodiment, the electrode bar groups ELM connected to the corresponding first transparent conductive wires TT1a and the electrode bar groups ELM connected to the corresponding first transparent conductive wires TT1b are alternately arranged along the second direction D2, that is, two adjacent electrode bar groups ELM are respectively connected to the first transparent conductive wires TT1a and the first transparent conductive wires TT1b at two sides of the electrode bar groups ELM, so that the first transparent conductive wires TT1 can be averagely disposed at two sides of the electrode bar groups ELM, thereby preventing the visual asymmetry caused by the frame width inconsistency at two sides of the touch panel TP 1. For example, the electrode bar set ELM further includes a fifth electrode bar set ELM5 adjacent to the first electrode bar set ELM1, and the electrode bar set ELM is located between the first transparent conductive line TT1a connected to the first electrode bar set ELM1 and the first transparent conductive line TT1b connected to the fifth electrode bar set ELM 5.
Please continue to refer to fig. 2. The touch panel TP1 of the present embodiment may further include at least one first opaque wire OT1 and at least one second opaque wire OT2 disposed in the opaque region OR for electrically connecting the first transparent wire TT1 extending to the second side S2 of the transparent region TR to the pad BP in the pad region PR. The first transparent conductive line TT1a is disposed between the first opaque conductive line OT1 and the electrode strip set ELM and extends from the second side S2 of the light transmissive region TR to the pad region PR of the first side S1 through the third side S3, and the first transparent conductive line TT1b is disposed between the second opaque conductive line OT2 and the electrode strip set ELM and extends from the second side S2 of the light transmissive region TR to the pad region PR of the first side S1 through the fourth side S4. The number of first transparent conductive lines TT1a connected to the electrode bar group ELM of the lower portion PB is the same as the number of first opaque conductive lines OT1, and the number of first transparent conductive lines TT1b connected to the electrode bar group ELM of the lower portion PB is the same as the number of second opaque conductive lines OT 2. Thus, the electrode strip set ELM in the lower portion PB may be electrically connected to the pad BP in the pad region PR through the first opaque conductive line OT1 and the second opaque conductive line OT2, respectively. It is noted that the first opaque wire OT1 and the second opaque wire OT2 may be formed of opaque conductive layers, which may include, for example, a metal material such as silver, so that the resistivity of the first opaque wire OT1 and the second opaque wire OT2 may be much smaller than the resistivity of the transparent conductive material forming the first transparent wire TT1 and the electrode bar set ELM, such that the equivalent resistance of the first opaque wire OT1 and the second opaque wire OT2 may be neglected relative to the equivalent resistance of the first transparent wire TT 1. Therefore, the first transparent conductive line TT1 of the electrode strip set ELM in the lower portion PB of the present embodiment can be designed to extend to the second side S2 of the light-transmitting region TR, thereby reducing the equivalent resistance of the first transparent conductive line TT 1.
The touch panel TP1 of the present embodiment may further include a plurality of third opaque wires OT3 disposed in the opaque region OR of the first side S1 of the transparent region TR for being respectively connected to the first transparent wires TT1 extending to the first side S1 of the transparent region TR, so as to electrically connect the electrode strip set ELM in the upper portion PT to the pad BP. In addition, the touch panel TP1 of the present embodiment optionally further includes at least one grounding trace GT surrounding the transparent region TR for preventing the internal circuit of the touch panel TP1 from being damaged by static electricity.
Referring to FIG. 5, a schematic cross-sectional view along the cross-sectional line A-A' of FIG. 4 is shown. As shown in fig. 5, the partially opaque conductive layer OL of the present embodiment may be directly formed on the first transparent conductive layer TL1, so that the first opaque conductive line OT1 may be directly electrically connected to the corresponding first transparent conductive line TT1, but is not limited thereto. For example, when the number of the first opaque wires OT1 is plural and is made of silver, the first opaque wire OT1 may be formed by forming a single opaque wire with a wider width, and then cutting the opaque wire into plural first opaque wires OT1 by laser cutting. Similarly, the second opaque wire OT2 may be formed in the same manner. In another embodiment, the opaque conductive layer OL may also be formed before the first transparent conductive layer TL1 and between a portion of the first transparent conductive layer TL1 and the substrate Sub.
Please refer to fig. 6 and fig. 7 in conjunction with fig. 2. Fig. 6 is a schematic top view of an electrode strip group and an electrode serial group according to the first embodiment of the invention, and fig. 7 is an enlarged schematic view of the touch panel according to the first embodiment of the invention corresponding to fig. 2, which crosses the touch region RT, the peripheral region RP and the region R of the opaque region OR. As shown in fig. 2, 6 and 7, each electrode bar set ELM of the present embodiment includes two electrode bars EL spaced apart from each other, and the electrode bars EL of each electrode bar set ELM may be electrically connected to each other through a corresponding transparent wire, for example, through the block portion P23 of the first transparent wire. Each electrode serial group ESS may include a first electrode serial ES1 and a second electrode serial ES2, each first electrode serial ES1 and each second electrode serial ES2 respectively include a plurality of electrode groups EM electrically connected to each other, wherein the electrode groups EM are arranged in an array, the electrode groups EM of each electrode serial group ESS are arranged in a same row, the electrode groups EM of each first electrode serial ES1 are located in odd columns, and the electrode groups EM of each second electrode serial ES2 are located in even columns. Each first electrode series ES1 includes a plurality of first connection segments CS1, and each first connection segment CS1 is connected to two adjacent electrode groups EM in each first electrode series ES 1. Each second electrode series ES2 includes a plurality of second connecting line segments CS2, and each second connecting line segment CS2 connects two adjacent electrode groups EM in each second electrode series ES2, respectively. The column direction and the row direction of the array can be, for example, but not limited to, the first direction D1 and the second direction D2. Each electrode bar group ELM overlaps with the electrode groups EM in two adjacent rows in the top view direction Z, and the two adjacent electrode bar groups ELM overlap with the electrode groups EM in the same row in the top view direction Z. Specifically, the electrode set EM in the first row of each row and the electrode set EM in the last row of each row respectively include an electrode E, and the remaining electrode sets EM include at least two electrodes E arranged along the second direction D2, so that the electrodes E can also be arranged in an array manner. The electrodes E of each electrode set EM are spaced from each other but electrically connected. Each electrode strip EL is overlapped with an electrode E in the same row in the electrode group EM in the same row in the top view direction Z, so that each electrode strip EL and the corresponding overlapped electrode E are capacitively coupled with each other to form a touch unit TU. Therefore, the touch area RT of the touch panel TP1 can be a range formed by the touch units TU, and the peripheral area RP is an area outside the touch units TU. In the present embodiment, each electrode strip EL may include a plurality of electrode portions ELA respectively overlapping one of the corresponding electrodes E, and an interface between the touch region RT and the peripheral region RP may be defined by an interface where the electrode portions ELA contact the first transparent conductive wires TT 1. For example, the electrode portion ELA may be formed by connecting a plurality of bar portions ELA1, for example, to form a grid shape. Each electrode bar EL of the embodiment may further include a plurality of shielding portions ELB, and each electrode portion ELA and each shielding portion ELB are alternately connected in series along the first direction D1, but not limited thereto. In each of the electrode stripes EL of the embodiment, the width of the touch unit TU closest to the peripheral region RP in the first direction D1 may be smaller than the width of the touch unit TU not closest to the peripheral region RP in the first direction D1. In order to uniformize the sensing amount of each touch unit TU, the width of the stripe portion ELA1 of the electrode portion ELA most adjacent to the peripheral region RP may be greater than the width of the stripe portion ELA1 of the electrode portion ELA not most adjacent to the transparent conductive line. In another embodiment, each electrode bar set ELM may be a single electrode bar overlapping two adjacent row electrode sets EM. In another embodiment, each electrode strip set ELM may only consist of a first electrode strip, each electrode series set ESS only consists of a second electrode strip, and each first electrode strip and each second electrode strip may be coupled with each other to form a touch unit. The design of the touch unit composed of the electrode strip group and the electrode serial group is not limited to the above, and the touch unit may be other types of touch panels.
In addition, one of the resistance adjustment portions P2 of the present embodiment may overlap one of the first connection line segments CS1 and one of the second connection line segments CS 2. Specifically, the resistance adjustment part P2 of the first transparent conductive line TT1a may overlap the second connection line segment CS2 of the electrode serial group ESS most adjacent to the first transparent conductive line TT1a, and the resistance adjustment part P2 of the first transparent conductive line TT1b may overlap the first connection line segment CS1 of the electrode serial group ESS most adjacent to the first transparent conductive line TT1 b. It should be noted that the resistance adjustment portion P2 of the present embodiment is fabricated by using the shielding portion originally closest to the corresponding first transparent conductive wire TT1, so the width of the resistance adjustment portion P2 in the first direction D1 can be the same as the width of the shielding portion ELB in the first direction D1. The advantage of this design is that the shielding portion ELB can achieve the purpose of uniformizing the equivalent resistance of each first transparent conductive wire TT1 while the shielding effect is almost intact.
It will be further explained that the design of the resistance adjustment portion P2 of the present embodiment does not affect the sensing position in the second direction D2 detected by a row of touch units TU nearest to the peripheral region RP. Referring to fig. 8, a schematic position diagram of the sensing amount sensed by the touch unit when the touch position of the user is located on the first transparent conductive line is shown, where the sensing amount shown in fig. 8 is only an example, and the invention is not limited thereto. As shown in fig. 6 TO 8, the touch unit TU1 is a touch unit TU adjacent TO the peripheral region RP, the touch unit TU2 is a touch unit TU surrounding the touch unit TU1, the electrode E forming the touch unit TU3 is electrically connected TO the electrode E forming the touch unit TU1, and the first transparent conductive line TT1 electrically connected TO the touch unit TU3 overlaps the touch object TO when the user touches the touch panel TP 1. When the center point of the touch object TO of the touch panel TP1 is located at the boundary between the touch unit TU1 and the peripheral region RP, the sensing amount of the touch unit TU1 can reach, for example, 368 signal amount, and the sensing amount of the touch unit TU3 far away from the touch unit TU1 can reach, for example, 15 signal amount because the touch object TO generates capacitive coupling with the corresponding first transparent conductive line TT1 and the electrode E of the touch unit TU1 electrically connected TO the electrode E. The touch panel TP1 is configured to obtain the sensing value of each touch unit TU of the nine-grid as the basis for calculating the touch position by taking the touch unit TU3 with the largest sensing value as the center point of the nine-grid, and does not consider the sensing values sensed by the touch units TU outside the nine-grid. In this example, the touch panel TP1 performs position calculation based on the sensing quantities sensed by the touch units TU1 and TU2, and the touch units TU3 outside the nine divisions are not listed in the calculation. Therefore, although the touch unit TU3 has a certain sensing amount, its position is not located in the grid of squared figure, so that the sensing amount generated by the touch unit TU3 does not affect the position accuracy of the touch panel TP1 in the second direction D2. Therefore, if the touch object TO moves linearly along the second direction D2, the sensing amount of the touch unit TU3 does not affect the measured accuracy of the straight line. In the embodiment, since the width of the peripheral region RP in the first direction D1 is less than half of the touch object TO, when the center point of the touch object TO is located at the boundary between the touch unit TU1 and the peripheral region RP, a part of the touch object TO may overlap the opaque region OR. For example, the width of the peripheral region RP may be up to about 1.9 millimeters.
It should be noted that, by the design of the touch panel TP1, the number of the first opaque wires OT1 and the second opaque wires OT2 of the present embodiment can be reduced. As shown in fig. 1, since the first opaque wires OT1 and the second opaque wires OT2 are included in the touch layer TL, the overlapping area between the touch layer TL and the opaque region OR can be reduced, so that the display device DD can be directly attached to the substrate Sub while being attached to the touch panel TP, rather than being indirectly attached to the substrate Sub through the touch layer TL. Therefore, when the display device DD needs to be separated from the substrate Sub, the touch layer TL is not attached to the display device DD due to strong adhesion between the touch layer TL and the display device DD, and the touch layer TL is easily separated from the display device DD.
Fig. 9 is a schematic top view of a touch panel according to a second embodiment of the invention. As shown in fig. 9, the difference between the touch panel TP2 of the present embodiment and the first embodiment is that the touch panel TP2 of the present embodiment may further include a plurality of second transparent conductive wires TT2 respectively connected to the other ends of one of the electrode bar sets ELM, such that two ends of the same electrode bar set ELM can be respectively connected to the first transparent conductive wires TT1 and the second transparent conductive wires TT2, and the same electrode bar set ELM can be connected to the same signal terminal through two transparent conductive wires. Therefore, when the driving signal is actually transmitted, the driving signal is simultaneously transmitted to the first transparent conductive line TT1 and the second transparent conductive line TT 2. Compared with the first embodiment, the equivalent resistance between each electrode bar set ELM and the pad of the present embodiment can be reduced, or in the case that the equivalent resistance between each electrode bar set ELM and the pad of the present embodiment is the same as that of the first embodiment, the width of the first transparent conductive line TT1 and the width of the second transparent conductive line TT2 can be smaller than that of the first transparent conductive line of the first embodiment. In the present embodiment, the structure of the second transparent conductive wire TT2 may be symmetrical to the structure of the corresponding first transparent conductive wire TT1, so that in the upper portion PT, the length of the lead portion P1 of the second transparent conductive wire TT2 connected to the first electrode strip group ELM1 is shorter than the length of the lead portion P1 of the second transparent conductive wire TT2 connected to the second electrode strip group ELM2, and the length of the resistance adjustment portion P2 of the second transparent conductive wire TT2 connected to the first electrode strip group ELM1 is longer than the length of the resistance adjustment portion P2 of the second transparent conductive wire TT2 connected to the second electrode strip group ELM 2. In the lower part PB, the length of the lead portion P1 of the second transparent conductive wire TT2 connected to the third electrode strip group ELM3 is shorter than the length of the lead portion P1 of the second transparent conductive wire TT2 connected to the fourth electrode strip group ELM4, and the length of the resistance adjustment portion P2 of the second transparent conductive wire TT2 connected to the third electrode strip group ELM3 is longer than the length of the resistance adjustment portion P2 of the second transparent conductive wire TT2 connected to the fourth electrode strip group ELM 4. In this embodiment, the second transparent conductive line TT2 of the electrode bar set ELM connected to the lower portion PB may also be electrically connected to the pad through the first opaque conductive line OT1 and the second opaque conductive line OT2, so that the sum of the numbers of the first transparent conductive lines TT1 and the second transparent conductive lines TT2 of the electrode bar set ELM connected to the lower portion PB is the same as the sum of the numbers of the first opaque conductive lines OT1 and the second opaque conductive lines OT 2.
Fig. 10 is a schematic top view of a touch panel according to a third embodiment of the invention. As shown in fig. 10, the difference between the touch panel TP3 of the present embodiment and the first embodiment is that the touch panel TP3 of the present embodiment does not include the first opaque conductive lines and the second opaque conductive lines. In other words, the electrode strip set ELM of the present embodiment is not divided into the upper portion and the lower portion, and the first transparent conductive wires TT1 extend from one end of the electrode strip set ELM to the first side S1 of the light-transmissive region OR, so that the first opaque conductive wires and the second opaque conductive wires are not needed, and thus the bezel of the touch panel TP3 of the present embodiment can be effectively lowered to approach the case of no bezel.
In summary, in the touch panel of the invention, the transparent wires formed by the transparent conductive material are used to electrically connect the electrode strip groups, so that the transparent wires can be disposed in the transparent area, thereby increasing the width of the transparent area, and reducing the number of the opaque wires disposed on the left and right sides of the transparent area, further reducing the width of the opaque area, and reducing the frame width of the touch panel. In addition, since the transparent wires made of the transparent conductive material are likely to have significantly different equivalent resistances due to different lengths, so that the equivalent resistances of the transparent wires are significantly different, in the touch panel of the present invention, the length of the meander line segment of the transparent wire connecting the electrode strip groups closer to the first side and/or the second side of the transparent area is designed to be longer than the length of the meander line segment of the transparent wire connecting the electrode strip groups farther from the first side and/or the second side of the transparent area, so as to compensate for the difference in equivalent resistances of the lead portions in the transparent wires, thereby making the equivalent resistances of the transparent wires uniform and reducing the phenomenon of non-uniformity of touch signals caused by the difference in equivalent resistances of the transparent wires.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.
Claims (16)
1. A touch panel having a transparent region and an opaque region, the opaque region including a pad region on a first side of the transparent region, the touch panel comprising:
A plurality of electrode strip groups respectively arranged in the light-transmitting area along a first direction, wherein the electrode strip groups comprise a first electrode strip group and a second electrode strip group, and the first electrode strip group is positioned between the second electrode strip group and the pad area;
A plurality of first transparent wires disposed in the light-transmitting region, each of the first transparent wires including a resistance adjustment portion connected to one end of one of the electrode strip groups, and the resistance adjustment portions electrically connected to the first electrode strip group and the second electrode strip group including a meander line segment, respectively, wherein the length of the meander line segment electrically connected to the first electrode strip group is longer than the length of the meander line segment electrically connected to the second electrode strip group; and
And a plurality of electrode serial groups which are respectively arranged in the light-transmitting area along a second direction different from the first direction, and the electrode serial groups are staggered with the electrode strip groups.
2. The touch panel of claim 1, wherein the transparent region has a second side opposite to the first side, and the first transparent conductive lines connected to the first electrode bar set and the second electrode bar set extend to the first side, wherein the electrode bar sets further include a third electrode bar set closer to the second side than the first side, and the first transparent conductive lines connected to the third electrode bar set extend to the second side.
3. The touch panel of claim 2, further comprising at least one opaque conductive line disposed in the opaque region and connected to the first transparent conductive line connected to the third electrode bar set, wherein the first transparent conductive lines are disposed between the opaque conductive lines and the electrode bar sets.
4. The touch panel of claim 2, wherein the electrode strip sets further include a fourth electrode strip set disposed between the third electrode strip set and the second side, the first transparent conductive wires electrically connected to the third electrode strip set and the fourth electrode strip set respectively include a meander line segment, and the length of the meander line segment electrically connected to the fourth electrode strip set is longer than the length of the meander line segment electrically connected to the third electrode strip set.
5. The touch panel of claim 1, wherein the electrode bar sets further include a fifth electrode bar set adjacent to the first electrode bar set, and the electrode bar sets are located between the first transparent conductive lines connected to the first electrode bar set and the first transparent conductive lines connected to the fifth electrode bar set.
6. The touch panel as recited in claim 1, wherein the electrode bar sets further include a sixth electrode bar set, the first electrode bar set and the second electrode bar set are located between the sixth electrode bar set and the pad area, and the first transparent conductive line electrically connected to the sixth electrode bar set does not have a meander line segment.
7. The touch panel of claim 1, wherein each of the first transparent conductive lines further comprises a lead portion extending from one end of the corresponding resistance adjustment portion to the opaque region.
8. The touch panel of claim 7, wherein the lead portions electrically connected to the first electrode strip group are shorter in length than the lead portions electrically connected to the second electrode strip group.
9. The touch panel of claim 7, wherein the line width of the lead portion connected to the first electrode bar group is smaller than the line width of the lead portion connected to the second electrode bar group.
10. The touch panel of claim 1, wherein the electrode bar sets and the first transparent conductive lines are formed of a transparent conductive layer.
11. The touch panel of claim 1, wherein the widths of the resistance adjustment portions in the first direction are the same.
12. The touch panel of claim 1, wherein each of the electrode strip sets comprises two electrode strips spaced apart from each other.
13. The touch panel of claim 12, wherein each of the electrode stripes includes a plurality of shielding portions, and a width of each of the resistance adjustment portions in the first direction is the same as a width of each of the shielding portions in the first direction.
14. The touch panel of claim 1, wherein each of the electrode serial groups comprises a first electrode serial and a second electrode serial, each of the first electrode serial comprises a plurality of first connecting line segments, each of the second electrode serial comprises a plurality of second connecting line segments, and one of the resistance adjustment portions overlaps one of the first connecting line segments and one of the second connecting line segments.
15. The touch panel of claim 1, further comprising a plurality of second transparent wires respectively connected to the other ends of one of the electrode bar sets.
16. The touch panel of claim 1, wherein a length of the meander line segment electrically connected to the first electrode bar set and a length of the meander line segment electrically connected to the second electrode bar set depend on an equivalent resistance difference between the first transparent conductive line including the meander line segment electrically connected to the first electrode bar set and the first transparent conductive line including the meander line segment electrically connected to the second electrode bar set.
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| CN201810537694.0A CN110554811A (en) | 2018-05-30 | 2018-05-30 | Touch panel with narrow frame |
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| CN201810537694.0A CN110554811A (en) | 2018-05-30 | 2018-05-30 | Touch panel with narrow frame |
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