CN110515228B - Touch control display device - Google Patents

Touch control display device Download PDF

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Publication number
CN110515228B
CN110515228B CN201910795063.3A CN201910795063A CN110515228B CN 110515228 B CN110515228 B CN 110515228B CN 201910795063 A CN201910795063 A CN 201910795063A CN 110515228 B CN110515228 B CN 110515228B
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China
Prior art keywords
touch
signal line
electrically connected
elements
pin
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CN201910795063.3A
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Chinese (zh)
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CN110515228A (en
Inventor
李家圻
张哲嘉
锺俊甫
陈意筑
陈政德
庄铭宏
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AU Optronics Corp
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AU Optronics Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

Abstract

A touch display device comprises 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 comprises a first touch electrode, a first switch element and a first anti-interference element. The first touch signal line is electrically connected with the first switch element and the first pin. The second touch unit comprises a second touch electrode, a second switch element and a second anti-interference element. The second touch signal line is electrically connected with the second switch element and the second pin. 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 impedance of the first switching element is greater than the impedance of the second switching element.

Description

Touch control display device
Technical Field
The present invention relates to a touch unit, and more particularly, to a touch display panel including a touch unit.
Background
With the development of technology, the occurrence rate of touch display panels on the market is gradually increasing, and various related technologies are also coming up endlessly. Generally, the touch display panel includes a plurality of 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 (e.g., a finger). In order to meet the market demand, the size of the touch display panel is increasing year by year. In a large-sized touch display panel, some touch units are close to the chip, and some touch units are far from the chip. The impedance between the touch units and the chip varies with the distance between the touch units and the chip, and if the impedance variation of the touch units at different positions is too large, the difference of the touch signals is too large. Under the condition of insufficient correction capability of the chip, the effect of remote touch (Hover) or small signal touch (passive pen or glove) can be affected.
Disclosure of Invention
The invention provides a touch display panel, which can enable signal intensities of touch units at different positions to be evenly distributed.
At least one embodiment of the present invention provides a touch display device. The touch display device comprises 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 comprises a first pin and a second pin. The touch unit is located on the substrate. The touch unit comprises a first touch unit and a second touch unit. The first touch unit comprises a first touch electrode positioned 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 with the first touch electrode and the chip. The second touch unit comprises a second touch electrode positioned 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 with the second touch electrode and the chip. The impedance of the first switching element is greater than the impedance of the second switching element. The first touch signal line is electrically connected with the first switch element and the first pin. The first common signal line is electrically connected with the first anti-interference element. The second touch signal line is electrically connected with the second switch element and the second pin. The second common signal line is electrically connected with the second anti-interference element.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1A is a top view of a touch display panel according to an embodiment of the invention.
Fig. 1B is a top view of a touch display panel according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a control signal of a touch display panel according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a control signal of a touch display panel according to an embodiment of the invention.
Fig. 4 is a top view of a touch display panel according to an embodiment of the invention.
Fig. 5A is a partial schematic diagram of a first switching element according to an embodiment of the invention.
Fig. 5B is a partial schematic diagram of a second switching element according to an embodiment of the invention.
Fig. 6 is a top view of a touch display panel according to an embodiment of the invention.
Fig. 7A is a top view of a touch display panel according to an embodiment of the invention.
Fig. 7B is a schematic sectional view along line aa' of fig. 7A.
Fig. 7C is a schematic sectional view taken along line bb' of fig. 7A.
Description of reference numerals:
10. 20, 30, 40: touch control display panel
100: substrate
110: pixel array
1201: first touch group
120P: p-th touch group
122: touch control unit
1221 to 1226: first to sixth touch units
130: chip and method for manufacturing the same
A: thin film transistor
A1: switching element
A2: anti-interference element
AA: display area
B1: first buffer layer
B2: second buffer layer
BA: peripheral zone
BP: insulating layer
CH. CH1, CH 2: channel layer
CL: shared signal line
CL 1-CL 6: first to sixth common signal lines
D. D1, D2: drain electrode
DL: data line
E: touch electrode
E1-E6: first to sixth touch electrodes
FL: fan-out line
FL 1-FL 6: first fan-out line to sixth fan-out line
GA. GA1, GA 2: grid electrode
G1, G2, G3, G4, M1, M2, M3, M4: control signal
GI: gate insulating layer
GI 1: a first gate insulating layer
GI 2: a second gate insulating layer
GL: control signal line
GL 1: first control signal line
GL 2: second control signal line
H1, H2, H3, H4, O1, O2, O3: opening of the container
I1, I2: insulating layer
ML, NL: conducting wire
L: signal line
L1, L2: length of channel
LCD: liquid crystal display mode
PE: pixel electrode
PL: planarization layer
S, S1, S2: source electrode
SL: scanning line
SM1, SM 2: light shielding layer
T: active component
TL: touch signal line
TL 1-TL 6: first to sixth touch signal lines
TP: touch sensing mode
Von, Voff: signal
W1, W2: width of channel
X: pin
X1-X6: first to sixth pins
Detailed Description
Fig. 1A is a top view of a touch display panel according to an embodiment of the invention. Fig. 1B is a top view of a touch display panel according to an embodiment of the invention. Fig. 1A omits a pixel array of the touch display panel, fig. 1B is a partially enlarged view of the touch display panel, and a position of fig. 1B corresponds to one of the touch units of the touch display panel of fig. 1A.
Referring to fig. 1A and 1B, the touch display panel 10 includes a substrate 100, a pixel array 110, a first touch group 1201 to a pth touch group 120P, a chip 130, a touch signal line TL, a first control signal line GL1, a common signal line CL, and a second control signal line GL2, where P is a positive integer.
The substrate 100 has a display area AA and a peripheral area BA located 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 devices T, and a plurality of pixel electrodes PE. The plurality of scan lines SL, the plurality of data lines DL, the plurality of active devices T, and the plurality of pixel electrodes PE are disposed on the display area AA of the substrate 100. The active devices T are electrically connected to the scan lines SL and the data lines DL. The pixel electrodes PE are electrically connected to the active devices T.
The first touch group 1201 to the pth touch group 120P are located on the substrate 100. Although the first touch group 1201 to the pth touch group 120P are located on the display area AA in the embodiment, the invention is not limited thereto. In other embodiments, the first touch group 1201 to the pth touch group 120P are partially located on the peripheral area BA. The first touch group 1201 to the pth touch group 120P overlap the pixel array 110. The first touch group 1201 to the pth touch group 120P are sequentially arranged in P rows.
Each of the first touch group 1201 to the pth touch group 120P includes a plurality of touch units 122. Each touch unit 122 includes a touch electrode E located in the display area AA, an anti-interference element a2, and a switch element a 1. The touch unit 122 overlaps the pixel array 110. The touch electrode E overlaps 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 a 1. The first control signal line GL1 is electrically connected to the switch element a 1.
The touch units 122 in the same row correspond to the same first control signal line GL 1. In the present embodiment, each touch unit 122 includes a plurality of switch elements a1, wherein the switch element a1 of the same touch unit 122 corresponds to the same touch signal line TL and the same first control signal line GL 1. Therefore, the signal transmitted from the touch signal line TL to the touch electrode E is less likely to be attenuated by the impedance of the switching element a 1. By connecting a plurality of switching elements a1 in parallel, the size of a single switching element a1 can be reduced.
In the embodiment, the first touch group 1201 to the pth touch group 120P respectively include more than two rows of touch units 122, and the first control signal lines GL1 of the more than two rows of touch units 122 are electrically connected to each other. 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 rows are electrically connected to different touch signal lines TL, respectively. In other words, the touch signals of the touch units 122 in the adjacent rows are transmitted through different touch signal lines TL. The switch elements a1 of the touch units 122 in different rows are electrically connected to different touch signal lines TL, respectively.
The same touch signal line TL is electrically connected to more than two of the first touch group 1201 to the pth touch group 120P. In the present embodiment, the first touch group 1201 to the pth touch group 120P respectively include two rows of touch units 122, in the same row of touch units 122, the switch element a1 of the touch unit 122 in the odd-numbered row 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 touch signal line 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-tamper element a 2. The second control signal line GL2 is electrically connected to the anti-jamming element a 2. In the present embodiment, the common signal lines CL of the 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 GL 2. In the present embodiment, each touch unit 122 includes a plurality of anti-jamming elements a2, wherein the anti-jamming 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 GL 2. Therefore, the signal transmitted from the common signal line CL to the touch electrode E is less likely to be attenuated by the impedance of the anti-interference element a 2. By connecting multiple jamming protection elements a2 in parallel, the size of a single jamming protection element a2 can be reduced.
In the embodiment, the first touch group 1201 to the pth touch group 120P respectively include more than two rows of touch units 122, and the second control signal lines GL2 of the more than two rows of touch units 122 are electrically connected to each other. In other words, the anti-jamming elements a2 in the same touch group are controlled by the same control signal.
The chip 130 is located on the peripheral area BA of the substrate 100. 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 chip 130. In the present 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 the touch display panel 10 includes one chip 130 in the embodiment, the invention is not limited thereto. The number of chips 130 may vary according to actual requirements.
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), so that the number of pins of the chip 130 for providing the touch signal can be reduced, and the number of required chips 130 can also be reduced. Since the number of the 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 a control signal of a touch display panel according to an embodiment of the invention. For example, fig. 2 is a schematic diagram of control signals on the first control signal line GL1 and the second control signal line GL2 of the touch display panel of fig. 1A and 1B.
When the signal Von is applied to the first control signal line GL1, the touch signal on the corresponding touch signal line TL passes through the corresponding switch element a1 and is transmitted to the corresponding touch electrode E. At this time, the corresponding touch electrode E has a touch sensing function. On the contrary, 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 GL 1), the touch signal on the corresponding touch signal line TL will hardly pass through the corresponding switch element a 1.
When the signal Von is applied to the second control signal line GL2, the common signal (or the common voltage) on the common signal line CL passes through the corresponding anti-interference element a2 and is transmitted to the corresponding touch electrode E. At this time, the corresponding touch electrode E can be used together with the pixel electrode in the touch display panel to control the turning of the liquid crystal. Conversely, 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), it is difficult for the common signal on the common signal line CL to pass through the corresponding interference rejection element a 2. Through the arrangement of the common signal line CL and the anti-interference element a2, the resistance-capacitance load (RC loading) of the touch display panel can be low, and the problem of loss of the common signal in the transmission process can be solved.
Referring to fig. 1A and 2, the touch display panel includes a first touch group 1201 to a pth touch group 120P.
For convenience of description, fig. 2 only illustrates control signals in the first touch group to the fourth touch group. 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. The control signal M2 is applied to the first control signal line corresponding to the second touch group (not shown in fig. 1A), and the control signal G2 is applied to the second control signal line corresponding to the second touch group (not shown in fig. 1A). 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 G3 is applied to the second control signal line corresponding to the third touch group (not shown in fig. 1A). The control signal M4 is applied to the first control signal line corresponding to the fourth touch group (not shown in fig. 1A), and the control signal G4 is applied to the second control signal line corresponding to the fourth touch group (not shown in fig. 1A).
The touch display panel is switched 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 liquid crystal turning 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 the other touch electrodes are applied with a common signal for controlling liquid crystal turning.
In the present embodiment, each time the touch sensing mode TP is switched, the touch signals are sequentially applied to the touch electrodes of two different touch groups. For example, when the touch sensing mode TP is switched to 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 sequentially switched to Voff, so that the touch signals are sequentially transmitted to the touch electrodes of the first touch group and the touch electrodes of the second touch group. When the touch sensing mode TP is switched to the second time, the control signal M3 and the control signal M4 are sequentially switched to Von, and the control signal G3 and the control signal G4 are sequentially switched to Voff, so that the touch signals are sequentially transmitted to the touch electrodes of the third touch group and the touch electrodes of the fourth touch group. The operation of other touch groups is similar, and when the touch electrodes of all touch groups (from the first touch group to the pth touch group) are scanned by the touch signal, the scanning is resumed from the first touch group.
Although in the present embodiment, each time the touch sensing mode TP is switched, the touch signals are sequentially applied to the touch electrodes of two different touch groups, the invention is not limited thereto. 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 touch groups.
Fig. 3 is a schematic diagram of a control signal of a touch display panel according to an embodiment of the invention. For example, fig. 3 is a schematic diagram of control signals on the first control signal line GL1 and the second control signal line GL2 of the touch display panel of fig. 1A and 1B.
Fig. 3 and fig. 2 represent different operation modes of the touch display panel, respectively, wherein similar portions in fig. 3 and fig. 2 can refer to the foregoing description, and are not repeated herein.
The main difference between the operation of fig. 3 and that of fig. 2 is that: in the embodiment of fig. 3, the common signal on the touch electrode is transmitted through the touch signal line in the LCD mode. In other words, in the embodiment of fig. 3, when the LCD is in the LCD mode, the control signals (e.g., M1-M4) on the first control signal lines of all the touch groups are switched to Von, so that the common signal on the touch signal lines can be transmitted to the touch electrode E through the switch elements.
In the touch sensing mode TP, the signal transmitted by the touch signal line is switched to a touch signal, and the common signal is transmitted through the common signal line. Therefore, in the touch sensing mode TP, in addition to switching the control signal on the first control signal line of the scanning touch group to Von, the control signals on the first control signal lines of other touch groups are switched to Voff, and the control signals on the second control signal lines of the other touch groups are switched to Von, so that the touch signals can pass through the switch element of the corresponding touch group and be transmitted to the corresponding touch electrode, and meanwhile, the common signal passes through the anti-interference element of the other touch groups and be transmitted to the touch electrode.
In the present embodiment, each time the touch sensing mode TP is switched, the touch signals are sequentially applied to the touch electrodes of two different touch groups. For example, when the touch sensing mode TP is switched to for the first time, the control signal M1 is maintained at Von, but the signal transmitted by the touch signal line TL corresponding to the first touch group is converted from the common signal to the touch signal. When the touch signal is transmitted to the first touch group, the control signals on the first control signal lines corresponding to other touch groups are switched to Voff, and the control signals on the second control signal lines corresponding to other touch groups are switched to Von, so that the common signal is transmitted 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. Meanwhile, the control signal M2 is switched to Von and the control signal G2 is switched to Voff, thereby passing the touch signal to the touch electrode of the second touch group. The operation of other touch groups is similar, and when the touch electrodes of all touch groups (from the first touch group to the pth touch group) are scanned by the touch signal, the scanning is resumed from the first touch group.
Fig. 4 is a top view of a touch display panel according to an embodiment of the invention. It should be noted that the embodiment of fig. 4 follows the element numbers and partial contents of the embodiment of fig. 1A and 1B, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
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 second common signal line CL 2. The chip 130 includes a first pin X1 and a second pin X2. In the present embodiment, the touch display device 20 further includes a fan-out line FL (e.g., a first fan-out line FL1 and a second fan-out line FL2), and 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, a plurality of first switch elements a11, and a plurality of first anti-jamming elements a21 on the display area AA. The first switch element a11 and the first anti-jamming 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 fanout 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-jamming 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, a plurality of second switch elements a12, and a plurality of second anti-interference elements a22 on the display area. The second switch 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 fanout 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 the present 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 flows from the first pin X1, through the first fanout line FL1, a portion of the first touch signal line TL1 and the first switch element a11, and then reaches the first touch electrode E1. The current flows from the second pin X2, through the second fanout line FL2, a portion of the second touch signal line TL2 and the second switch element a12, and then reaches the second touch electrode E2. The sum of the length of the first fanout line FL1, the length of a portion of the first touch signal line TL1 between the first fanout 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 sum of the length of the second fanout line FL2, and the length of a portion of the second touch signal line TL2 between the second fanout line FL2 and the second switch element a12, and the channel length (effective channel length) of one of the second switch elements a 12.
In the embodiment, the length of the portion of the first touch signal line TL1 corresponding to the space between the first pin X1 and the first touch electrode E1 is less than the length of the portion of the second touch signal line TL2 corresponding to the space between the second pin X2 and the second touch electrode E2. In other words, the length of the portion of the first touch signal line TL1 between the first fanning-out line FL1 and the first switch element a11 is less than the length of the portion of the second touch signal line TL2 between the second fanning-out line FL2 and the second switch element a 12.
In the embodiment, the sum of the impedance of the first fanout line FL1 and the impedance of the portion of the first touch signal line TL1 between the first fanout line FL1 and the first switch element a11 is smaller than the sum of the impedance of the second fanout line FL2 and the impedance of the portion of the second touch signal line TL2 between the second fanout line FL2 and the second switch element a 12. By adjusting the impedance of the first switch element a11 and the impedance of the second switch element a12, the signal intensities of the first touch unit 1221 and the second touch unit 1222 are evenly distributed. Specifically, the impedance of the first switching element a11 is greater than the impedance of the second switching element a 12. Therefore, the problem of uneven distribution of resistance-capacitance loads (RC loading) caused by the fact that the lengths of the fanout lines corresponding to the touch units are not consistent with the lengths of the touch signal lines can be solved.
In addition, the same touch signal line TL (e.g., the first touch signal line TL1 and the second touch signal line TL2) may be electrically connected to more than two touch units (or touch electrodes), so that the number of pins of the chip 130 for providing touch signals may be reduced, and the number of required chips 130 may also be reduced. Since the number of the 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 invention. Fig. 5B is a partial schematic diagram of a second switching element according to an embodiment of the invention. For example, fig. 5A and 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 each include a gate GA, a channel CH, a source S, and a drain D. The channel CH is located between the source S and the drain D. The gate insulating layer GI is sandwiched between the gate GA and the channel CH, and the length of the gate GA overlapping the channel CH is defined as the channel length (or 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 fig. 4, fig. 5A and fig. 5B, in the present embodiment, the channel length (or effective channel length) of each first switch element a11 is L1, and the channel width (or effective channel width) of each first switch 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, wherein W1/L1 is less than W2/L2. Therefore, the impedance of the first switching element a11 is greater than the impedance of the second switching element a 12.
In other embodiments, the signal intensities of the first touch-sensing unit and the second touch-sensing unit are evenly distributed by adjusting the impedance of the first anti-jamming element a21 and the impedance of the second anti-jamming element a 22. Specifically, the impedance of first anti-jamming element A21 is greater than the impedance of second anti-jamming element A22. Therefore, the problem of uneven distribution of resistance-capacitance loads (RC loading) caused by the fact that the lengths of the fanout lines corresponding to the touch units are different from the length of the common signal line can be solved. For example, the ratio of the effective channel width of the first anti-jamming element a21 to the effective channel length of the first anti-jamming element a21 is smaller than the ratio of the effective channel width of the second anti-jamming element a22 to the effective channel length of the second anti-jamming element a22, so that the impedance of the first anti-jamming element a21 is larger than that of the second anti-jamming element a 22.
Fig. 6 is a top view of a touch display panel according to an embodiment of the invention. It should be noted that the embodiment of fig. 6 follows the element numbers and partial contents of the embodiment of fig. 4, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
The main differences between the touch display device 30 of fig. 6 and the touch display device 20 of fig. 4 are: in the touch display device 30, the number of switch elements and the number of anti-interference elements in the touch unit may be changed according to the position of the touch unit.
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 switch elements a11 and a plurality of first anti-jamming elements a21 electrically connected to the first touch electrode E1. The first touch signal line TL1 is electrically connected to the first fanout line FL1 and the first switch element a11, and the first fanout 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 electrically connects the chip 130 and the first anti-jamming element a 21.
The second touch unit 1222 includes a plurality of second switch elements a12 and a plurality of second anti-interference elements a22 electrically connected to the second touch electrode E2. The second touch signal line TL2 is electrically connected to the second fanout line FL2 and the second switch element a12, and the second fanout 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 a 22.
The third touch unit 1223 includes a plurality of third switch elements a13 and a plurality of third interference rejection elements a23 electrically connected to the third touch electrode E3. The third touch signal line TL3 is electrically connected to the third fan-out line FL3 and the third switching 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 is electrically connected to the chip 130 and the third anti-jamming element a 23.
The fourth touch unit 1224 includes a plurality of fourth switch elements a14 and a plurality of fourth anti-jamming elements a24 electrically connected to the fourth touch electrode E4. The fourth touch signal line TL4 is electrically connected to the fourth fanout line FL4 and the fourth switching element a14, and the fourth fanout 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-jamming element a 24.
The fifth touch unit 1225 includes a plurality of fifth switch elements a15 and a plurality of fifth anti-jamming elements a25 electrically connected to the fifth touch electrode E5. 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-jamming element a 25.
The sixth touch unit 1226 includes a plurality of sixth switch elements a16 and a plurality of sixth interference rejection elements a26 electrically connected to the sixth touch electrode E6. The sixth touch signal line TL6 is electrically connected to the sixth fan-out line FL6 and the sixth switching 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-jamming element a 26.
In the embodiment, the second touch electrode E2, the fourth touch electrode E4 and the sixth touch electrode E6 are farther from the corresponding pin X of the chip 130 than the first touch electrode E1, the third touch electrode E3 and the fifth touch electrode E5. In other words, the current paths between the second, fourth, and sixth touch electrodes E2, E4, E6 and the chip are greater than the current paths between the first, third, and fifth touch electrodes E1, E3, E5 and the chip 130.
In the present embodiment, the number of the first switching elements a11, the number of the third switching elements a13, and the number of the fifth switching elements a15 are less than the number of the second switching elements a12, the number of the fourth switching elements a14, and the number of the sixth switching elements a 16. Therefore, the signal intensity (intensity of the touch signal) 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 switching element is the same, and therefore, 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 may be adjusted, thereby changing the total impedance of the switching elements.
In the present embodiment, the number of first interference suppression elements a21, the number of third interference suppression elements a23, and the number of fifth interference suppression elements a25 are less than the number of second interference suppression elements a22, the number of fourth interference suppression elements a24, and the number of sixth interference suppression elements a 26. Therefore, the signal intensities (the intensity of the common signal) 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-jamming element is the same, and therefore, the total impedance of the anti-jamming elements can be changed by adjusting the number of the anti-jamming elements. In other embodiments, the ratio of the effective channel length to the effective channel width of the immunity element and the number of immunity elements may be adjusted, thereby changing the total impedance of the immunity element.
The second touch electrode E2 and the sixth touch electrode E6 are respectively close to the leftmost side and the rightmost side of the touch display device 30, and the lengths of the second fan-out line FL2 and the sixth fan-out line FL6 are greater than the length of the fourth fan-out line FL 4. Therefore, the current paths between the second touch electrode E2 and the sixth touch electrode E6 and the chip 130 are larger than the current path between the fourth touch electrode E4 and the chip 130.
In the present 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 a 16. Therefore, the signal intensity (intensity of the touch signal) of the touch units at different positions can be evenly distributed. In the present embodiment, the number of second anti-jamming elements a22 is less than the number of fourth anti-jamming elements a24 and the number of sixth anti-jamming elements a 26. Therefore, the signal intensities (the intensity of the common signal) of the touch units at different positions can be evenly distributed.
In this embodiment, the number of the switch elements of the same touch unit is equal to the number of the anti-interference elements, so that the intensity of the signal on the touch signal line and the intensity of the signal on the common signal line can be matched with each other, but the invention is not limited thereto. In other embodiments, the number of the switch elements of the same touch unit is not equal to the number of the anti-interference elements.
In the present embodiment, the first to sixth touch signal lines TL1 to TL6 respectively include a plurality of conductive lines ML parallel to each other, and the first to sixth common signal lines CL1 to CL6 respectively include a plurality of conductive lines NL parallel to each other. Therefore, each touch unit can be provided with a plurality of switch elements connected in parallel and a plurality of anti-interference elements connected in parallel, so that the impedance of the switch elements and the impedance of the anti-interference elements can be reduced. In the embodiment, the first common signal line CL1 is substantially the same signal line as the second common signal line CL2, the third common signal line CL3 is substantially the same signal line as the fourth common signal line CL4, and the fifth common signal line CL5 is substantially the same signal line as the sixth common signal line CL6, but the invention is not limited thereto.
In this embodiment, the number of the switch elements and the number of the anti-jamming elements of each touch unit may be adjusted according to actual requirements, and is not limited to the number shown in fig. 6.
Table 1 shows impedance values of the fan-out lines, impedance values of the touch signal lines, the number of the switching elements, and impedance values of the switching elements, which correspond to six touch units, in another embodiment of the touch display device.
TABLE 1
Figure BDA0002180692320000141
Figure BDA0002180692320000151
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 fanout line. The relative positions of the first touch unit to the sixth touch unit can refer to fig. 6. In table 1, the impedance value of the touch signal line refers to the impedance value of a portion of the touch signal line corresponding to the touch unit, and may also be referred to as the impedance value of a portion of the touch signal line through which current flows from the chip to the touch unit.
As can be seen from table 1, the problem of uneven impedance distribution caused by the impedance values of the fanout lines and the touch signal lines can be solved by adjusting the number of the switching elements.
Fig. 7A is a top view of a touch display panel according to an embodiment of the invention. Fig. 7B is a schematic sectional view along line aa' of fig. 7A. Fig. 7C is a schematic sectional view taken along line bb' of fig. 7A. It should be noted that the embodiment of fig. 7A, 7B and 7C follows the element numbers and partial contents of the embodiment of fig. 1A and 1B, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
Referring to fig. 7A, 7B and 7C, the light-shielding layer SM1 and the light-shielding layer SM2 are disposed on the substrate 100. The first buffer layer B1 and the second buffer layer B2 are stacked on the light-shielding layer SM1 and the light-shielding layer SM2 in this order. The first buffer layer B1 and the second buffer layer B2 are made of silicon nitride and silicon oxide, respectively. The channel layer CH1 and the channel layer CH2 are disposed on the second buffer layer B2, and the channel layer CH1 and the channel layer CH2 are single-layer or multi-layer structures, and the materials thereof include amorphous silicon, polysilicon, microcrystalline silicon, monocrystalline silicon, organic semiconductor materials, oxide semiconductor materials (such as indium zinc oxide, indium gallium zinc oxide, or other suitable materials or combinations thereof), or other suitable materials or materials containing dopants (dopats) therein or combinations thereof. 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 CH 2. The first gate insulating layer GI1 and the second gate insulating layer GI2 are made of silicon oxide and silicon nitride, respectively. The gate GA1 and the gate GA2 are disposed on the second gate insulating layer GI2 and overlap the channel layer CH1 and the channel layer CH2, respectively. The gate GA1 and the gate GA2 are electrically connected to the scan line SL and a control signal line GL (e.g., the first control signal line GL1 or the second control signal line GL2 in the above embodiments), respectively. The scan line SL, the first control signal line GL1, and the second control signal line GL2 belong to the same layer. An insulating layer I1 and an insulating layer I2 are sequentially stacked on the gate GA1 and the gate GA 2. The materials of the insulating layer I1 and the insulating layer I2 respectively include silicon oxide and silicon nitride. The source S1 and the drain D1 are located on the insulating layer I2 and electrically connected to the channel layer CH1 through the openings H1 and H2, respectively, and the openings H1 and H2 penetrate through the first gate insulating layer GI1, the second gate insulating layer GI2, the insulating layer I1, and the insulating layer I2, for example. The source S1 is electrically connected to the data line DL. The source S2 and the drain D2 are located on the insulating layer I2 and electrically connected to the channel layer CH2 through the openings H3 and H4, respectively, and the openings H3 and H4 penetrate through the first gate insulating layer GI1, the second gate insulating layer GI2, the insulating layer I1, and the insulating layer I2, for example. The source S2 is electrically connected to a signal line L (e.g., the touch signal line TL or the common signal line CL in the aforementioned embodiment). The touch signal line TL, the common signal line CL and the data line DL belong to the same film layer.
The gate GA1, the gate GA2, the source S1, the source S2, the drain D1, and the drain D2 are, for example, a single layer or a multilayer structure, and the material includes, for example, metals such as chromium, gold, silver, copper, tin, lead, hafnium, tungsten, molybdenum, neodymium, titanium, tantalum, aluminum, zinc, alloys of the metals, oxides of the metals, nitrides of the metals, or combinations of the metals, or other conductive materials.
In the present embodiment, the active device T of the pixel array 110 includes a channel layer CH1, a gate GA1, a source S1, and a drain D1. The thin film transistor a (e.g., the switch element a1 or the anti-interference element a2 of the foregoing embodiment) includes a channel layer CH2, a gate GA2, a source S2 and a drain D2. Although the active device T and the thin film transistor a are top gate thin film transistors in the embodiment, the invention is not limited thereto. In other embodiments, the active device T and the switching device a are bottom gate thin film transistors.
The planarization layer PL is disposed on the source S1, the source S2, the drain D1 and the drain D2. The touch electrode E is located on the planarization layer PL and electrically connected to the drain D2 through the opening O3, and the opening O3 penetrates through the planarization layer PL, for example. The insulating layer BP is located on the touch electrode E. The pixel electrode PE is disposed on the insulating layer BP and electrically connected to the drain electrode D1 through an opening O1, the opening O1 for example penetrates through the insulating layer BP and the planarization layer PL. The touch electrode E has an opening O2 corresponding to the opening O1. The pixel electrode PE further includes, for example, a display medium layer and a filter element substrate.
In summary, 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, so that the number of pins of the chip for providing the touch signal can be reduced, and the number of chips required can also 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 described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims (6)

1. A touch display device, comprising:
a substrate;
the chip is positioned on a peripheral area of the substrate and comprises a first pin and a second pin;
multiple touch units on the substrate, including a first touch unit and a second touch unit
The first touch unit includes:
the first touch electrode is positioned on a display area; and
a plurality of first switch elements and a plurality of first anti-interference elements, which are located on the display area and electrically connected to the first touch electrode and the chip, wherein each of the first anti-interference elements comprises a thin film transistor comprising a gate, a channel, a source and a drain;
the second touch unit includes:
a second touch electrode located on the display area, wherein a current path between the first touch electrode and the first pin is smaller than a current path between the second touch electrode and the second pin; and
a plurality of second switch elements and a plurality of second anti-interference elements located on the display area, wherein each of the second anti-interference elements comprises a thin film transistor comprising a gate, a channel, a source and a drain, and electrically connected to the second touch electrode and the chip, wherein the impedance of the first switch elements is greater than the impedance of the second switch elements, wherein the ratio of the effective channel width of the first anti-interference elements to the effective channel length of the first anti-interference elements is smaller than the ratio of the effective channel width of the second anti-interference elements to the effective channel length of the second anti-interference elements, and wherein the impedance of the first anti-interference elements is greater than the impedance of the second anti-interference elements;
a first touch signal line electrically connected between the first switch elements and the first pins, wherein the first touch signal line comprises a plurality of parallel wires;
the first common signal line is electrically connected with the first anti-interference elements and comprises a plurality of parallel conducting wires;
a second touch signal line electrically connected between the second switch elements and the second pins, wherein the second touch signal line comprises a plurality of parallel wires; and
a second common signal line electrically connected to the second anti-interference elements,
the touch display device further includes:
the first fanout line is connected between the first touch signal line and the first pin, and the extension direction of the first fanout line is different from the extension direction of the first touch signal line and the first pin; and
a second fan-out line connected between the second touch signal line and the second pin, wherein the extension direction of the second fan-out line is different from the extension direction of the second touch signal line and the second pin, and the length of the first fan-out line is less than that of the second fan-out line; and
the distance from the first anti-interference elements to the corresponding first pins in the peripheral area is smaller than the distance from the second anti-interference elements to the corresponding second pins in the peripheral area; and
the first anti-interference elements are connected in parallel, and the second anti-interference elements are connected in parallel.
2. The touch display device of claim 1, wherein the number of the first switch elements is less than the number of the second switch elements.
3. The touch display device of claim 1, wherein a length of a portion of the first touch signal line between the first pin and the first touch electrode is smaller than a length of a portion of the second touch signal line between the second pin and the second touch electrode.
4. The touch display device of claim 1, further comprising:
a first control signal line electrically connected to the first switch elements;
the second control signal line is electrically connected with the first anti-interference elements; and
a pixel array disposed on the display region, wherein the pixel array comprises:
a plurality of scanning lines and a plurality of data lines, which are positioned on the substrate, wherein the first control signal line, the second control signal line and the scanning lines belong to the same film layer, and the first touch signal line, the first common signal line and the data lines belong to the same film layer;
a plurality of active components electrically connected to the scan lines and the data lines; and
and a plurality of pixel electrodes electrically connected to the active devices.
5. 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.
6. 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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