TWI750448B - Touch display panel - Google Patents

Abstract

A touch display panel includes a substrate, a chip, a first touch unit, a first touch signal line, a first common signal line, a second touch unit, a second touch signal line, and a second common signal line. The first touch unit includes a first touch electrode, first switching elements, and first anti-interference elements. The first touch signal line electrically connects the first switching elements to a first lead. The second touch unit includes a second touch electrode, second switching elements, and second anti-interference elements. The second touch signal line electrically connects the second switching elements to a second lead. A current path between the first touch electrode and the first lead is smaller than a current path between the second touch electrode and a second lead. A total impedance of the first switching elements is greater than a total impedance of the second switching elements.

Description

touch display device

The present invention relates to a touch unit, and more particularly, to a touch display panel including the touch unit.

With the advancement of technology, the appearance rate of touch display panels in the market is gradually increasing, and various related technologies are emerging one after another. Generally speaking, a touch display panel includes many touch electrodes corresponding to different touch positions, and the chip can calculate which touch electrode in the touch display panel corresponds to the current position of an external object (eg, a finger). In order to meet the market demand, the size of the touch display panel is increasing year by year. In a large-size touch display panel, some touch units are close to the chip, and some touch units are far away from the chip. The impedance between the touch unit and the chip will change with the distance between the two. If the impedance variation of the touch unit at different positions is too large, the difference of the touch signal will be too large. When the chip correction capability is insufficient, the effect of long-distance touch (Hover) or small-signal touch (passive pen or gloves) will be affected.

The present invention provides a touch display panel, which can evenly distribute the signal strengths of touch units at different positions.

At least one embodiment of the present invention provides a touch display device. The touch display device includes a substrate, a chip, a plurality of touch units, a first touch signal line, a first common signal line, a second touch signal line and a second common signal line. The chip is located on the substrate and includes first pins and second pins. The touch unit is located on the substrate. The touch unit includes a first touch unit and a second touch unit. The first touch unit includes a first touch electrode on the display area, a plurality of first switch elements and a plurality of first anti-interference elements. The first switch element and the first anti-interference element are electrically connected to the first touch electrode and the chip. The second touch unit includes a second touch electrode on the display area, a plurality of second switch elements and a plurality of second anti-interference elements. The current path between the first touch electrode and the first pin is smaller than the current path between the second touch electrode and the second pin. The second switch element and the second anti-interference element are electrically connected to the second touch electrode and the chip. The impedance sum of the first switching element is greater than the impedance sum of the second switching element. The first touch signal line is electrically connected to the first switch element and the first pin. The first common signal line is electrically connected to the first anti-interference element. The second touch signal line is electrically connected to the second switch element and the second pin. The second common signal line is electrically connected to the second anti-interference element.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

10, 20, 30, 40: touch display panel

100: Substrate

110: pixel array

1201: The first touch group

120P: P-th touch group

122: Touch Unit

1221~1226: The first touch unit ~ the sixth touch unit

130: Wafer

A: Thin Film Transistor

A1: Switching element

A2: Anti-jamming components

AA: display area

B1: The first buffer layer

B2: Second buffer layer

BA: Surrounding area

BP: insulating layer

CH, CH1, CH2: channel layer

CL: Common signal line

CL1~CL6: The first common signal line ~ the sixth common signal line

D, D1, D2: drain

DL: data line

E: touch electrode

E1~E6: the first touch electrode ~ the sixth touch electrode

FL: Fan Out Line

FL1~FL6: The first fan-out line ~ the sixth fan-out line

GA, GA1, GA2: gate

G1, G2, G3, G4, M1, M2, M3, M4: Control signal

GI: Gate insulating layer

GI1: first gate insulating layer

GI2: Second gate insulating layer

GL: Control signal line

GL1: The first control signal line

GL2: The second control signal line

H1, H2, H3, H4, O1, O2, O3: Opening

I1, I2: insulating layer

ML, NL: wire

L: signal line

L1, L2: channel length

LCD: liquid crystal display mode

PE: pixel electrode

PL: flat layer

S, S1, S2: source

SL: scan line

SM1, SM2: shading layer

T: Active element

TL: touch signal line

TL1~TL6: The first touch signal line ~ the sixth touch signal line

TP: Touch sensing mode

Von, Voff: Signal

W1, W2: channel width

X: pin

X1~X6: The first pin ~ the sixth pin

FIG. 1A is a schematic top view of a touch display panel according to an embodiment of the present invention.

FIG. 1B is a schematic top view of a touch display panel according to an embodiment of the present invention.

FIG. 2 is a schematic top view of a touch display panel according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of control signals of a touch display panel according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of control signals of a touch display panel according to an embodiment of the present invention.

FIG. 4 is a schematic top view of a touch display panel according to an embodiment of the present invention.

FIG. 5A is a partial schematic diagram of a first switching element according to an embodiment of the present invention.

FIG. 5B is a partial schematic diagram of a second switching element according to an embodiment of the present invention.

6 is a schematic top view of a touch display panel according to an embodiment of the present invention.

7A is a schematic top view of a touch display panel according to an embodiment of the present invention.

Fig. 7B is a schematic cross-sectional view taken along line aa' of Fig. 7A.

Fig. 7C is a schematic cross-sectional view along line bb' of Fig. 7A.

FIG. 1A is a schematic top view of a touch display panel according to an embodiment of the present invention. FIG. 1B is a schematic top view of a touch display panel according to an embodiment of the present invention. FIG. 1A omits the pixel array of the touch display panel, FIG. 1B is a partial enlarged view of the touch display panel, and the position of FIG. 1B corresponds to one of the touch units of the touch display panel of FIG. 1A .

1A and FIG. 1B , the touch display panel 10 includes a substrate 100 , a pixel array 110 , a first touch group 1201 to a P-th touch group 120P, a chip 130 , a touch signal line TL, a first control The signal line GL1, the common signal line CL and the second control signal line GL2, wherein P is a positive integer.

The substrate 100 has a display area AA and a peripheral area BA located on at least one side of the display area AA. The pixel array 110 is located on the display area AA of the substrate 100 . The pixel array 110 includes a plurality of scan lines SL, a plurality of data lines DL, a plurality of active elements T and a plurality of pixel electrodes PE. A plurality of scan lines SL, a plurality of data lines DL, a plurality of active elements T and a plurality of pixel electrodes PE are located on the display area AA of the substrate 100 . The plurality of active elements T are electrically connected to the plurality of scan lines SL and the plurality of data lines DL. The plurality of pixel electrodes PE are electrically connected to the plurality of active elements T.

The first touch group 1201 to the P-th touch group 120P are located on the substrate 100 . Although in this embodiment, the first touch group 1201 to the P-th touch group 120P are located on the display area AA, the present invention is not limited to this. In other embodiments, the first touch group 1201 to the P-th touch group 120P are partially located on the peripheral area BA. The first touch group 1201 to the P-th touch group 120P overlap with the pixel array 110 . The first touch group 1201 to the P-th touch group 120P are arranged in P rows in sequence.

Each of the first touch group 1201 to the P-th touch group 120P includes a plurality of touch units 122, respectively. Each touch unit 122 includes a touch electrode E located in the display area AA, an anti-interference element A2 and a switch element A1. The touch unit 122 overlaps the pixel array 110 . The touch electrodes E overlap with the plurality of pixel electrodes PE.

The switch element A1 is electrically connected to the touch electrode E. The touch signal line TL is electrically connected to the switch element A1. The first control signal line GL1 is electrically connected to the switch element A1.

The touch units 122 in the same row correspond to the same first control signal line GL1. In this embodiment, each touch unit 122 includes a plurality of switch elements A1 , wherein the switch elements A1 of the same touch unit 122 correspond to the same touch signal line TL and the same first control signal line GL1 . Therefore, the signal transmitted by the touch signal line TL to the touch electrode E is less likely to be attenuated by the impedance of the switching element A1. By connecting a plurality of switching elements A1 in parallel, the size of a single switching element A1 can be reduced.

In this embodiment, the first touch group 1201 to the P-th touch group 120P respectively include two or more rows of touch units 122, and the first control signal lines GL1 of the two or more rows of touch units 122 are electrically connected to each other. sexual connection. In other words, the switch elements A1 in the same touch group are controlled by the same control signal.

The switch elements A1 of the touch units 122 in adjacent columns are electrically connected to different touch signal lines TL, respectively. In other words, the touch signals of the touch units 122 in adjacent columns are transmitted through different touch signal lines TL. The switch elements A1 of the touch units 122 in different rows are respectively electrically connected to different touch signal lines TL.

The same touch signal line TL is electrically connected to two or more of the first touch group 1201 to the P-th touch group 120P. In this embodiment, the first touch group 1201 to the P-th touch group 120P respectively include two columns of touch units 122 , and in the same row of touch units 122 , the switches of the touch units 122 in odd-numbered columns are located The element A1 is electrically connected to one of the touch signal lines TL, and the switch element A1 of the touch unit 122 in the even-numbered row is electrically connected to the other of the touch signal lines TL.

The anti-interference element A2 is electrically connected to the touch electrode E. The common signal line CL is electrically connected to the anti-interference element A2. The second control signal line GL2 is electrically connected to the anti-interference element A2. In this embodiment, the common signal lines CL of the plurality of touch units 122 are electrically connected to each other.

The touch units 122 in the same row are electrically connected to the same second control signal line GL2. In this embodiment, each touch unit 122 includes a plurality of anti-interference elements A2, wherein the anti-interference elements A2 of the same touch unit 122 are electrically connected to the same common signal line CL and the same second control signal line GL2. Therefore, the signal transmitted by the common signal line CL to the touch electrode E is less likely to be attenuated by the impedance of the anti-interference element A2. By connecting a plurality of anti-jamming elements A2 in parallel, the size of a single anti-jamming element A2 can be reduced.

In this embodiment, the first touch group 1201 to the P-th touch group 120P respectively include two or more rows of touch units 122, and the second control signal lines GL2 of the two or more rows of touch units 122 are electrically connected to each other sexual connection. In other words, the anti-interference elements A2 in the same touch group are controlled by the same control signal.

The wafer 130 is located on the peripheral area BA of the substrate 100 . The first control signal line The GL1 , the second control signal line GL2 , the common signal line CL and the touch signal line TL are electrically connected to the chip 130 . In this embodiment, the chip 130 includes a plurality of pins X, and the first control signal line GL1 , the second control signal line GL2 , the common signal line CL and the touch signal line TL are electrically connected to the corresponding pins X. Although in this embodiment, the touch display panel 10 includes one chip 130 as an example, the invention is not limited to this. The number of wafers 130 can be changed according to actual needs.

Based on the above, the same touch signal line TL of the touch display panel 10 of the present embodiment can be electrically connected to more than two touch units (or touch electrodes), therefore, the chip 130 for providing touch signals The number of pins can be reduced, and it can be said that the number of required chips 130 can be reduced. Since the number of chips 130 can be reduced, the area of the peripheral area BA of the touch display panel 10 can be reduced, and the manufacturing cost of the touch display panel 10 can be reduced.

FIG. 2 is a schematic diagram of control signals of a touch display panel according to an embodiment of the present invention. For example, FIG. 2 is a schematic diagram of the control signals on the first control signal line GL1 and the second control signal line GL2 of the touch display panel of FIGS. 1A and 1B, for example.

When the signal Von is applied to the first control signal line GL1 , the touch signal on the corresponding touch signal line TL will pass through the corresponding switch element A1 and be transmitted to the corresponding touch electrode E. At this time, the corresponding touch electrodes E have the function of touch sensing. Conversely, when the signal Voff is applied to the first control signal line GL1 (or when no signal is applied to the first control signal line GL1 ), the touch signal on the corresponding touch signal line TL will hardly pass through the corresponding switch element A1 .

When the signal Von is applied to the second control signal line GL2, the common signal (or common voltage) on the common signal line CL will pass through the corresponding anti-interference element A2 and be transmitted to the corresponding touch electrode E. At this time, the corresponding touch electrodes E can be used together with the pixel electrodes in the touch display panel to control the turning of the liquid crystal. On the contrary, when the signal Voff is applied to the second control signal line GL2 (or when no signal is applied to the second control signal line GL2), the common signal on the common signal line CL will hardly pass through the corresponding anti-interference element A2. With the arrangement of the common signal line CL and the anti-interference element A2, the RC loading of the touch display panel can be lower, and the problem of loss of the common signal during transmission can be improved.

Please refer to FIG. 1A and FIG. 2 , the touch display panel includes a first touch group 1201 to a P-th touch group 120P.

For the convenience of description, FIG. 2 only takes the control signals on the first touch group to the fourth touch group as an example. The control signal M1 is applied to the first control signal line GL1 corresponding to the first touch group 1201 , and the control signal G1 is applied to the second control signal line GL2 corresponding to the first touch group 1201 . A control signal M2 is applied to the first control signal line corresponding to the second touch group (not shown in FIG. 1A ), and a control signal is applied to the second control signal line corresponding to the second touch group (not shown in FIG. 1A ) G2. The control signal M3 is applied to the first control signal line corresponding to the third touch group (not shown in FIG. 1A ), and the control signal M3 is applied to the second control signal line corresponding to the third touch group (not shown in FIG. 1A ) G3. A control signal M4 is applied to the first control signal line corresponding to the fourth touch group (not shown in FIG. 1A ), and a control signal is applied to the second control signal line corresponding to the fourth touch group (not shown in FIG. 1A ) G4.

The touch display panel will switch to a liquid crystal display mode LCD or a touch sensing mode TP over time. When the touch display panel is in the liquid crystal display mode LCD, a common signal for controlling the turning of the liquid crystal is applied to the touch electrodes. When the touch display panel is in the touch sensing mode TP, at least one touch electrode is applied with a touch signal, and other touch electrodes are applied with a common signal for controlling the turning of the liquid crystal.

In this embodiment, each time the touch sensing mode TP is switched, touch signals are sequentially applied to the touch electrodes of two different touch groups. For example, when switching to the touch sensing mode TP for the first time, the control signal M1 and the control signal M2 are sequentially switched to Von, and the control signal G1 and the control signal G2 are switched to Voff in sequence, thereby sequentially The touch signal is transmitted to the touch electrodes of the first touch group and the touch electrodes of the second touch group. When switching to the touch sensing mode TP for the second time, the control signal M3 and the control signal M4 are switched to Von in sequence, and the control signal G3 and the control signal G4 are switched to Voff in sequence, so that the touch signal is sequentially switched to Voff. It is transmitted to the touch electrodes of the third touch group and the touch electrodes of the fourth touch group. The operation methods of other touch groups are analogous. After the touch electrodes of all touch groups (the first touch group to the P-th touch group) are scanned with the touch signal, the first touch The control group starts rescanning.

Although in this embodiment, each time the touch sensing mode TP is switched, touch signals are sequentially applied to the touch electrodes of two different touch groups, but the present invention is not limited to this. In other embodiments, each time the touch sensing mode TP is switched, a touch signal is applied to the touch electrodes of one or more than three touch groups.

FIG. 3 is a control panel of a touch display panel according to an embodiment of the present invention. Schematic diagram of the control signal. For example, FIG. 3 is a schematic diagram of the control signals on the first control signal line GL1 and the second control signal line GL2 of the touch display panel of FIGS. 1A and 1B, for example.

FIG. 3 and FIG. 2 respectively represent different operation modes of the touch display panel, and the parts similar to FIG. 3 and FIG. 2 can be referred to the foregoing description, and will not be repeated here.

The main difference between the operation mode of FIG. 3 and the operation mode of FIG. 2 is that in the embodiment of FIG. 3 , in the liquid crystal display mode LCD, the common communication signal on the touch electrodes is transmitted through the touch signal line. In other words, in the embodiment of FIG. 3, in the liquid crystal display mode LCD, the control signals (eg M1-M4) on the first control signal lines of all touch groups are switched to Von, so that the touch signal lines on the The common signal can be transmitted to the touch electrode E through the switch element.

In the touch sensing mode TP, the signal transmitted by the touch signal line is switched to the touch signal, and the common communication signal is transmitted through the common signal line. Therefore, in the touch sensing mode TP, except that the control signal on the first control signal line of the touch group being scanned is switched to Von, the control signals on the first control signal line of other touch groups are switched to Voff, Switch the control signal on the second control signal line of the other touch group to Von, so that the touch signal can pass through the switch element of the corresponding touch group and be transmitted to the corresponding touch electrode, and the common signal can pass through other The anti-interference element of the touch group is transmitted to the touch electrodes.

In this embodiment, each time the touch sensing mode TP is switched, touch signals are sequentially applied to the touch electrodes of two different touch groups. For example, when switching to the touch sensing mode TP for the first time, the control signal M1 is maintained at Von, and then The signal transmitted by the touch signal line TL corresponding to the first touch group is converted from a common signal to a touch signal. When transmitting touch signals to the first touch group, switch the control signals on the first control signal lines corresponding to other touch groups to Voff, and switch the control signals on the second control signal lines corresponding to other touch groups to Voff The signal is switched to Von to transmit the common signal to other touch groups through the common signal line.

Then, the control signal M1 is switched to Voff, and the control signal G1 is switched to Von, so that the common signal is transmitted to the touch electrodes of the first touch group through the common signal line CL. At the same time, the control signal M2 is switched to Von and the control signal G2 is switched to Voff, so that the touch signal is transmitted to the touch electrodes of the second touch group. The operation methods of other touch groups are analogous. After the touch electrodes of all touch groups (the first touch group to the P-th touch group) are scanned with the touch signal, the first touch The control group starts rescanning.

FIG. 4 is a schematic top view of a touch display panel according to an embodiment of the present invention. It must be noted here that the embodiment of FIG. 4 uses the element numbers and part of the content of the embodiment of FIG. 1A and FIG. 1B , wherein the same or similar reference numbers are used to represent the same or similar elements, and the same technical content is omitted. instruction. For the description of the omitted part, reference may be made to the foregoing embodiments, which will not be repeated here.

The touch display device 20 includes a substrate 100, a chip 130, a first touch unit 1221, a first touch signal line TL1, a first common signal line CL1, a second touch unit 1222, a second touch signal line TL2, and a first touch signal line TL2. The two share the signal line CL2. The chip 130 includes a first pin X1 and a second pin X2. In this embodiment, the touch display device 20 further includes fan-out lines FL (eg, the first fan-out line FL1 and the second fan-out line FL1 ). Line FL2), the fan-out line FL is located on the peripheral area BA.

The first touch unit 1221 is located on the substrate 100 . The first touch unit 1221 includes a first touch electrode E1 on the display area AA, a plurality of first switching elements A11 and a plurality of first anti-interference elements A21. The first switching element A11 and the first anti-interference element A21 are electrically connected to the first touch electrode E1 and the chip 130 . The first touch signal line TL1 is electrically connected to the first switch element A11 and the first pin X1 of the chip 130 . The first fan-out line FL1 is connected to the first touch signal line TL1 and the first pin X1. The first common signal line CL1 is electrically connected to the first anti-interference element A21 and the chip 130 .

The second touch unit 1222 is located on the substrate 100 . The second touch unit 1222 includes a second touch electrode E2 on the display area, a plurality of second switching elements A12 and a plurality of second anti-interference elements A22. The second switching element A12 and the second anti-interference element A22 are electrically connected to the second touch electrode E2 and the chip 130 . The second touch signal line TL2 is electrically connected to the second switch element A12 and the second pin X2. The second fan-out line FL2 is connected to the second touch signal line TL2 and the second pin X2. The second common signal line CL2 is electrically connected to the second anti-interference element A22 and the chip 130 . In this embodiment, the first common signal line CL1 and the second common signal line CL2 are electrically connected to each other.

The current path between the first touch electrode E1 and the first pin X1 is smaller than the current path between the second touch electrode E2 and the second pin X2. For example, the current starts from the first pin X1, flows through the first fan-out line FL1, part of the first touch signal line TL1 and the first switching element A11, and then reaches the first touch electrode E1. The current starts from the second pin X2, flows through the second fan-out line FL2, part of the second touch signal line TL2 and the second switch element A12, and then reaches the second touch electrode E2. first fan The sum of the length of the outlet line FL1, the length of the part of the first touch signal line TL1 between the first fan-out line FL1 and the first switch element A11, and the channel length (effective channel length) of one of the first switch elements A11 is less than The length of the second fan-out line FL2, the length of a part of the second touch signal line TL2 between the second fan-out line FL2 and the second switch element A12, and the channel length (effective channel length) of one of the second switch elements A12 the combination.

In this embodiment, the length of the first touch signal line TL1 corresponding to the part between the first pin X1 and the first touch electrode E1 is smaller than that of the second touch signal line TL2 corresponding to the second pin X2 and the first touch electrode E1 The length of the part between the two touch electrodes E2. In other words, the length of the part of the first touch signal line TL1 between the first fan-out line FL1 and the first switch element A11 is smaller than that of the part of the second touch signal line between the second fan-out line FL2 and the second switch element A12 The length of the signal line TL2.

In this embodiment, the impedance of the first fan-out line FL1 and the impedance of a part of the first touch signal line TL1 between the first fan-out line FL1 and the first switching element A11 are combined less than the impedance of the second fan-out line FL2 The impedance and the impedance of a part of the second touch signal line TL2 between the second fan-out line FL2 and the second switching element A12 are combined. By adjusting the impedance combination of the first switch element A11 and the impedance combination of the second switch element A12, the signal intensities on the first touch unit 1221 and the second touch unit 1222 are evenly distributed. Specifically, the impedance sum of the first switching element A11 is greater than the impedance sum of the second switching element A12. Thereby, the problem of uneven distribution of RC loading caused by inconsistent lengths of the fan-out lines corresponding to each touch unit and the touch signal lines can be improved.

In addition, the same touch signal line TL (for example, the first touch signal line TL1 and the second touch signal line TL2 ) can be electrically connected to more than two touch units (or touch electrodes), so it is used for The number of pins of the chip 130 for providing touch signals can be reduced, and it can be said that the required number of chips 130 can be reduced. Since the number of chips 130 can be reduced, the area of the peripheral area BA of the touch display panel 20 can be reduced, and the manufacturing cost of the touch display panel 20 can be reduced.

FIG. 5A is a partial schematic diagram of a first switching element according to an embodiment of the present invention. FIG. 5B is a partial schematic diagram of a second switching element according to an embodiment of the present invention. For example, FIG. 5A and FIG. 5B are partial schematic views of the first switching element and the second switching element of the embodiment of FIG. 4 , respectively.

The first switching element and the second switching element respectively include a gate GA, a channel CH, a source S and a drain D. Channel CH is located between source S and drain D. A gate insulating layer GI is sandwiched between the gate GA and the channel CH, the length of the gate GA overlapping the channel CH is defined as the channel length (or the effective channel length), and the width of the gate GA overlapping the channel CH is defined as the channel width (or effective channel width).

Referring to FIGS. 4 , 5A and 5B, in this embodiment, the channel length (or effective channel length) of each first switching element A11 is L1, and the channel width (or effective channel width) of each first switching element A11 is W1. The channel length (or effective channel length) of each second switching element A12 is L2, and the channel width (or effective channel width) of each second switching element A12 is W2, where W1/L1 is smaller than W2/L2. Therefore, the impedance of the first switching element A11 is larger than the impedance of the second switching element A12.

In other embodiments, by adjusting the impedance of the first anti-interference element A21 The combination and the impedance combination of the second anti-interference element A22 make the signal intensity on the first touch unit and the second touch unit evenly distributed. Specifically, the impedance sum of the first anti-interference element A21 is greater than the impedance sum of the second anti-interference element A22. In this way, the problem of uneven distribution of RC loading caused by inconsistent lengths of the fan-out lines corresponding to each touch unit and the common signal line can be improved. For example, the ratio of the effective channel width of the first anti-interference element A21 to the effective channel length of the first anti-interference element A21 is smaller than the ratio of the effective channel width of the second anti-interference element A22 to the effective channel length of the second anti-interference element A22. ratio, so that the impedance sum of the first anti-interference element A21 is greater than the impedance sum of the second anti-interference element A22.

6 is a schematic top view of a touch display panel according to an embodiment of the present invention. It must be noted here that the embodiment of FIG. 6 uses the element numbers and part of the content of the embodiment of FIG. 4 , wherein the same or similar numbers are used to represent the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, which will not be repeated here.

The main difference between the touch display device 30 of FIG. 6 and the touch display device 20 of FIG. 4 is that in the touch display device 30 , the number of switch elements and the number of anti-interference elements in the touch unit may vary depending on the touch unit. varies by location.

The touch display device 30 includes a plurality of touch units, such as a first touch unit 1221 to a sixth touch unit 1226 .

The first touch unit 1221 includes a plurality of first switching elements A11 and a plurality of first anti-interference elements A21 electrically connected to the first touch electrodes E1. The first touch signal line TL1 is electrically connected to the first fan-out line FL1 and the first switch element A11. The first fan The outgoing line FL1 is electrically connected to the first touch signal line TL1 and the first pin X1 of the chip 130 . The first common signal line CL1 is electrically connected to the chip 130 and the first anti-interference element A21.

The second touch unit 1222 includes a plurality of second switching elements A12 and a plurality of second anti-interference elements A22 electrically connected to the second touch electrodes E2. The second touch signal line TL2 is electrically connected to the second fan-out line FL2 and the second switch element A12 , and the second fan-out line FL2 is electrically connected to the second touch signal line TL2 and the second pin X2 of the chip 130 . The second common signal line CL2 electrically connects the chip 130 and the second anti-interference element A22.

The third touch unit 1223 includes a plurality of third switching elements A13 and a plurality of third anti-interference elements A23 electrically connected to the third touch electrodes E3. The third touch signal line TL3 is electrically connected to the third fan-out line FL3 and the third switch element A13 , and the third fan-out line FL3 is electrically connected to the third touch signal line TL3 and the third pin X3 of the chip 130 . The third common signal line CL3 electrically connects the chip 130 and the third anti-interference element A23.

The fourth touch unit 1224 includes a plurality of fourth switch elements A14 and a plurality of fourth anti-interference elements A24 electrically connected to the fourth touch electrodes E4. The fourth touch signal line TL4 is electrically connected to the fourth fan-out line FL4 and the fourth switch element A14 , and the fourth fan-out line FL4 is electrically connected to the fourth touch signal line TL4 and the fourth pin X4 of the chip 130 . The fourth common signal line CL4 is electrically connected to the chip 130 and the fourth anti-interference element A24.

The fifth touch unit 1225 includes multiple touch electrodes electrically connected to the fifth touch electrodes E5. A fifth switching element A15 and a plurality of fifth anti-interference elements A25. The fifth touch signal line TL5 is electrically connected to the fifth fan-out line FL5 and the fifth switch element A15 , and the fifth fan-out line FL5 is electrically connected to the fifth touch signal line TL5 and the fifth pin X5 of the chip 130 . The fifth common signal line CL5 is electrically connected to the chip 130 and the fifth anti-interference element A25.

The sixth touch unit 1226 includes a plurality of sixth switching elements A16 and a plurality of sixth anti-interference elements A26 electrically connected to the sixth touch electrodes E6. The sixth touch signal line TL6 is electrically connected to the sixth fan-out line FL6 and the sixth switch element A16 , and the sixth fan-out line FL6 is electrically connected to the sixth touch signal line TL6 and the sixth pin X6 of the chip 130 . The sixth common signal line CL6 is electrically connected to the chip 130 and the sixth anti-interference element A26.

In this embodiment, the second touch electrodes E2, the fourth touch electrodes E4, and the sixth touch electrodes E6 are more compact than the first touch electrodes E1, the third touch electrodes E3, and the fifth touch electrodes E5. away from the corresponding pin X in the wafer 130 . In other words, the current paths between the second touch electrodes E2, the fourth touch electrodes E4, and the sixth touch electrodes E6 and the chip are larger than those of the first touch electrodes E1, the third touch electrodes E3, and the fifth touch electrodes. Current path between electrode E5 and wafer 130 .

In this embodiment, the number of first switching elements A11, the number of third switching elements A13, and the number of fifth switching elements A15 are less than the number of second switching elements A12, the number of fourth switching elements A14, and the number of sixth switching elements Number of elements A16. In this way, the signal intensity (intensity of the touch signal) of the touch units at different positions can be evenly distributed. In this embodiment, the effective channel length of each switching element The ratio of the degree to the effective channel width is the same, so adjusting the number of switching elements can change the total impedance of the switching elements. In other embodiments, the ratio of the effective channel length to the effective channel width of the switching elements and the number of switching elements can be adjusted, thereby changing the total impedance of the switching elements.

In this embodiment, the number of the first anti-interference elements A21, the number of the third anti-interference elements A23 and the number of the fifth anti-interference elements A25 are less than the number of the second anti-interference elements A22, the number of the fourth anti-interference elements A24 number and the number of the sixth anti-jamming element A26. In this way, the signal strengths (the strengths of the common communication signals) of the touch units at different positions can be evenly distributed. In this embodiment, the ratio of the effective channel length to the effective channel width of each anti-interference element is the same. Therefore, adjusting the number of the anti-interference elements can change the total impedance of the anti-interference elements. In other embodiments, the ratio of the effective channel length to the effective channel width of the anti-jamming element and the number of the anti-jamming elements can be adjusted, thereby changing the total impedance of the anti-jamming element.

The second touch electrode E2 and the sixth touch electrode E6 are respectively close to the leftmost and the rightmost of the touch display device 30 , and the lengths of the second fan-out line FL2 and the sixth fan-out line FL6 are longer than that of the fourth fan-out line FL4 length. Therefore, the current paths between the second touch electrodes E2 and the sixth touch electrodes E6 and the chip 130 are larger than the current paths between the fourth touch electrodes E4 and the chip 130 .

In this embodiment, the number of the second switching elements A12 is less than the number of the fourth switching elements A14 and the number of the sixth switching elements A16. In this way, the signal intensity (intensity of the touch signal) of the touch units at different positions can be evenly distributed. In this embodiment, the number of the second anti-interference elements A22 is less than that of the fourth anti-interference elements A24 and the number of the sixth anti-interference element A26. In this way, the signal strengths (the strengths of the common communication signals) of the touch units at different positions can be evenly distributed.

In this embodiment, the number of switch elements of the same touch unit is equal to the number of anti-interference elements. Therefore, the strength of the signal on the touch signal line and the strength of the signal on the common signal line can match each other. However, the present invention does not limited to this. In other embodiments, the number of switch elements of the same touch unit is not equal to the number of anti-interference elements.

In this embodiment, the first touch signal line TL1 to the sixth touch signal line TL6 respectively include a plurality of conductive lines ML parallel to each other, and the first common signal line CL1 to the sixth common signal line CL6 respectively include a plurality of parallel lines ML. Wires NL. Therefore, each touch unit can have multiple switch elements connected in parallel and multiple anti-interference elements connected in parallel at more positions, so that the impedance combination of the switch elements and the impedance combination of the anti-interference elements can be reduced. In this embodiment, the first common signal line CL1 and the second common signal line CL2 are substantially the same signal line, the third common signal line CL3 and the fourth common signal line CL4 are substantially the same signal line, and the fifth common signal line CL3 is substantially the same signal line as the fourth common signal line CL4. The common signal line CL5 and the sixth common signal line CL6 are substantially the same signal line, but the invention is not limited to this.

In this embodiment, the number of switch elements and the number of anti-interference elements of each touch unit can be adjusted according to actual needs, and are not limited to the numbers shown in FIG. 6 .

Table 1 shows a touch display device according to another embodiment, wherein the impedance values of the fan-out lines corresponding to the six touch units, the impedance values of the touch signal lines, and the switch elements and the impedance value of the switching element.

In Table 1, the sum of the impedance values is equal to the impedance value of the corresponding touch signal line plus the total impedance value of the corresponding switch element plus the impedance value of the corresponding fan-out line. The relative positions of the first touch unit to the sixth touch unit may refer to FIG. 6 . The impedance value of the touch signal line in Table 1 refers to the impedance of the part of the touch signal line corresponding to the touch unit It can also be said that when the current flows from the chip to the touch unit, the impedance value of the part of the touch signal line that passes through it.

It can be seen from Table 1 that the problem of uneven impedance distribution caused by the impedance value of the fan-out line and the impedance value of the touch signal line can be improved by adjusting the number of switching elements.

7A is a schematic top view of a touch display panel according to an embodiment of the present invention. Fig. 7B is a schematic cross-sectional view taken along line aa' of Fig. 7A. Fig. 7C is a schematic cross-sectional view along line bb' of Fig. 7A. It must be noted here that the embodiments of FIGS. 7A , 7B and 7C use the element numbers and part of the content of the embodiment of FIGS. 1A and 1B , wherein the same or similar reference numbers are used to represent the same or similar elements, and The description of the same technical content is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, which will not be repeated here.

Please refer to FIG. 7A , FIG. 7B and FIG. 7C , the light shielding layer SM1 and the light shielding layer SM2 are located on the substrate 100 . The first buffer layer B1 and the second buffer layer B2 are sequentially stacked on the light shielding layer SM1 and the light shielding layer SM2. The materials of the first buffer layer B1 and the second buffer layer B2 are, for example, silicon nitride and silicon oxide, respectively. The channel layer CH1 and the channel layer CH2 are located on the second buffer layer B2, and the channel layer CH1 and the channel layer CH2 are single-layer or multi-layer structures, and their materials include amorphous silicon, polysilicon, microcrystalline silicon, single crystal silicon, organic semiconductor materials, Oxide semiconductor materials (eg, indium zinc oxide, indium gallium zinc oxide, or other suitable materials or a combination of the above) or other suitable materials or dopant are contained in the above materials or a combination of the above. The first gate insulating layer GI1 and the second gate insulating layer GI2 are sequentially stacked on the channel layer CH1 and the channel layer on CH2. The materials of the first gate insulating layer GI1 and the second gate insulating layer GI2 are, for example, silicon oxide and silicon nitride, respectively. The gate electrode GA1 and the gate electrode GA2 are located on the second gate insulating layer GI2 and overlap the channel layer CH1 and the channel layer CH2 respectively. The gate electrode GA1 and the gate electrode GA2 are respectively electrically connected to the scan line SL and the control signal line GL (eg, the first control signal line GL1 or the second control signal line GL2 in the foregoing embodiment). The scan line SL, the first control signal line GL1 and the second control signal line GL2 belong to the same film layer. The insulating layer I1 and the insulating layer I2 are sequentially stacked on the gate electrode GA1 and the gate electrode GA2. Materials of the insulating layer I1 and the insulating layer I2 include silicon oxide and silicon nitride, respectively. The source electrode S1 and the drain electrode D1 are located on the insulating layer I2, and are respectively electrically connected to the channel layer CH1 through openings H1 and H2. The openings H1 and H2, for example, penetrate the first gate insulating layer GI1, the second gate insulating layer GI2, and the insulating layer I1 with the insulating layer I2. The source electrode S1 is electrically connected to the data line DL. The source electrode S2 and the drain electrode D2 are located on the insulating layer I2, and are electrically connected to the channel layer CH2 through openings H3 and H4, respectively. The openings H3 and H4, for example, penetrate the first gate insulating layer GI1, the second gate insulating layer GI2, and the insulating layer I1 with the insulating layer I2. The source electrode S2 is electrically connected to the signal line L (eg, the touch signal line TL or the common signal line CL in the foregoing embodiment). The touch signal line TL, the common signal line CL and the data line DL belong to the same film layer.

The gate electrode GA1, the gate electrode GA2, the source electrode S1, the source electrode S2, the drain electrode D1 and the drain electrode D2 are, for example, a single-layer or multi-layer structure, and the materials include, for example, chromium, gold, silver, copper, tin, lead, hafnium, tungsten, Molybdenum, neodymium, titanium, tantalum, aluminum, zinc and other metals, alloys of the above metals, oxides of the above metals, nitrides of the above metals or combinations of the above materials or other conductive materials.

In this embodiment, the active element T of the pixel array 110 includes a channel layer CH1, gate GA1, source S1 and drain D1. The thin film transistor A (eg, the switching element A1 or the anti-interference element A2 in the foregoing embodiment) includes a channel layer CH2 , a gate electrode GA2 , a source electrode S2 and a drain electrode D2 . Although in this embodiment, the active element T and the thin film transistor A are taken as an example of a top gate type thin film transistor, the present invention is not limited to this. In other embodiments, the active element T and the switching element A are bottom gate type thin film transistors.

The flat layer PL is located on the source electrode S1, the source electrode S2, the drain electrode D1 and the drain electrode D2. The touch electrode E is located on the flat layer PL, and is electrically connected to the drain electrode D2 through the opening O3, for example, the opening O3 penetrates through the flat layer PL. The insulating layer BP is located on the touch electrode E. The pixel electrode PE is located on the insulating layer BP, and is electrically connected to the drain electrode D1 through the opening O1, for example, the opening O1 penetrates the insulating layer BP and the flat layer PL. The touch electrodes E have openings O2 corresponding to the openings O1. For example, the pixel electrode PE further includes a display medium layer and a filter element substrate.

To sum up, the same signal line L (or touch signal line) of the touch display panel 40 of the present embodiment can be electrically connected to more than two touch electrodes, therefore, a chip for providing touch signals The number of pins can be reduced, it can be said that the number of required chips can be reduced. Since the number of chips can be reduced, the area of the peripheral region of the touch display panel can be reduced, and the manufacturing cost of the touch display panel can be reduced.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

10: Touch display panel

100: Substrate

1201: The first touch group

120P: P-th touch group

122: Touch Unit

130: Wafer

A1: Switching element

A2: Anti-jamming components

AA: display area

BA: Surrounding area

CL: Common signal line

E: touch electrode

GL1: The first control signal line

GL2: The second control signal line

TL: touch signal line

X: pin

Claims (9)

A touch display device includes: a substrate; a chip on the substrate, and the chip includes a first lead and a second lead; a plurality of touch units on the substrate, the touch The unit includes a first touch unit and a second touch unit, wherein the first touch unit includes: a first touch electrode located on a display area; and a plurality of first switch elements and a plurality of first touch The anti-interference element is located on the display area and is electrically connected to the first touch electrode and the chip; the second touch unit includes: a second touch electrode located on the display area, wherein the first touch electrode The current path between the control electrode and the first pin is smaller than the current path between the second touch electrode and the second pin; and a plurality of second switching elements and a plurality of second anti-interference elements are located in the on the display area and electrically connected to the second touch electrode and the chip, wherein the impedance sum of the first switching elements is greater than the impedance sum of the second switching elements, and the number of the first switching elements is less than the number of the first switching elements the number of the second switching elements; a first touch signal line electrically connecting the first switching elements and the first pin; a first common signal line electrically connecting the first anti-interference elements; A second touch signal line is electrically connected to the second switching elements and the second pins; and a second common signal line is electrically connected to the second anti-interference elements. The touch display device according to claim 1, wherein the channel length of each of the first switching elements is L1, the channel width of each of the first switching elements is W1, and the channel length of each of the second switching elements is L2, the channel width of each of the second switching elements is W2, wherein W1/L1 is smaller than W2/L2. The touch display device according to claim 1, wherein a length of the first touch signal line corresponding to a portion between the first pin and the first touch electrode is smaller than the length of the second touch signal The line corresponds to the length of the portion between the second pin and the second touch electrode. The touch display device according to claim 1, wherein the first touch signal line comprises a plurality of wires parallel to each other. The touch display device according to claim 1, further comprising: a first fan-out line connecting the first touch signal line and the first pin; and a second fan-out line connecting the first pin The second touch signal line and the second pin, wherein the length of the first fan-out line is smaller than the length of the second fan-out line. The touch display device as claimed in claim 1, wherein the combined impedance of the first anti-interference elements is greater than the combined impedance of the second anti-interference elements. The touch display device according to claim 1, further comprising: a first control signal line electrically connected to the first switching elements; a second control signal line electrically connected to the first resistors interfering elements; and A pixel array located on the display area, wherein the pixel array includes: a plurality of scan lines and a plurality of data lines on the substrate, wherein the first control signal line, the second control signal line and the The scan lines belong to the same film layer, the first touch signal line, the first common signal line and the data lines belong to the same film layer; a plurality of active elements are electrically connected to the scan lines and the data lines; and a plurality of pixel electrodes electrically connected to the active elements. The touch display device of claim 1, wherein the first common signal line and the second common signal line are electrically connected to each other. The touch display device of claim 1, wherein the first touch signal line is electrically connected to two or more of the touch units.

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