CN110688030A - Touch display panel and display device - Google Patents
Touch display panel and display device Download PDFInfo
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- CN110688030A CN110688030A CN201910945717.6A CN201910945717A CN110688030A CN 110688030 A CN110688030 A CN 110688030A CN 201910945717 A CN201910945717 A CN 201910945717A CN 110688030 A CN110688030 A CN 110688030A
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- 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
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- 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
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- Position Input By Displaying (AREA)
Abstract
The embodiment of the invention discloses a touch display panel and a display device, comprising: the multi-path selection circuit comprises a plurality of multi-path selection units, wherein the input end of one multi-path selection unit is correspondingly arranged and electrically connected with one touch control source line, the multi-path selection unit is provided with m output ends, and the m output ends of one multi-path selection unit are respectively and electrically connected with the touch control line groups corresponding to the m adjacent touch control electrode blocks in one row; the non-display area further comprises m public voltage source lines and m public voltage switch control lines, wherein the ith public voltage switch control line controls the i-th public voltage source line to be simultaneously conducted or simultaneously cut off with transmission paths of a plurality of public voltage line groups corresponding to the km + i-th row of touch electrode blocks; in the touch control stage, at least one touch control line group transmits a touch control signal and at least one common voltage switch control line controls a corresponding common voltage source line to transmit a first voltage signal to a common voltage line group. The embodiment of the invention realizes the narrow frame.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to a touch display panel and a display device.
Background
With the rapid development of display technologies, touch display devices have been gradually advanced into the lives of everyone, and common touch display devices include touch display devices such as smart phones and tablet computers.
The touch display device integrates a touch function and a display function. The structure of the integrated touch display device according to its touch function can be classified into at least an external type and an embedded type. In the In-cell touch display device, the touch electrodes are integrated In the display panel, and In order to achieve the thinning, the common electrode layer is usually divided into a plurality of touch electrode blocks, so that the display function is achieved In the display stage and the touch function is achieved In the touch stage.
At present, in an embedded touch display device, a large amount of frame area is occupied by common voltage signal wiring and touch signal wiring, so that a wide frame is formed.
Disclosure of Invention
The embodiment of the invention provides a touch display panel and a display device, which are used for realizing a narrow frame.
An embodiment of the present invention provides a touch display panel, including: a display area and a non-display area surrounding the display area;
the display area comprises a plurality of touch signal lines, a plurality of common voltage signal lines and a plurality of touch electrode blocks which are arranged in an array mode, one touch electrode block is electrically connected with one touch line group, one touch electrode block is also electrically connected with one common voltage line group, the touch line group comprises at least one touch signal line, and the common voltage line group comprises at least one common voltage signal line;
the non-display area comprises a plurality of touch control source lines and a multi-path selection circuit, the multi-path selection circuit comprises a plurality of multi-path selection units, the input end of one multi-path selection unit is correspondingly arranged and electrically connected with one touch control source line, the multi-path selection unit is provided with m output ends, the m output ends of one multi-path selection unit are respectively and electrically connected with the touch control line groups corresponding to the adjacent m touch control electrode blocks in a row, and m is not less than 2 and is an integer;
the non-display area further comprises m public voltage source lines and m public voltage switch control lines, the ith public voltage switch control line controls the ith public voltage source line and transmission paths of a plurality of public voltage line groups corresponding to the touch electrode blocks in the km + i row to be simultaneously conducted or simultaneously cut off, i is more than or equal to 1 and less than or equal to m, and k is a natural number;
in the touch control stage, the multi-channel selection unit conducts a signal transmission path between an input end and one output end of the multi-channel selection unit to enable the touch control line group to transmit a touch control signal, and meanwhile, for at least one touch control electrode block which does not transmit the touch control signal, at least one common voltage switch control line controls the common voltage source line corresponding to the multi-channel selection unit and the transmission path of the common voltage line group to be simultaneously conducted to enable the common voltage line group to transmit a first voltage signal;
in the display stage, each common voltage switch control line controls the common voltage source line corresponding to the common voltage switch control line to be simultaneously conducted with the common voltage line group so as to enable the common voltage line group to transmit a common voltage signal.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the touch display panel.
In the embodiment of the invention, one multi-path selection unit is provided with m output ends, one touch control source line can realize touch control signal transmission with m touch control electrode blocks in a time-sharing manner, the number of touch control signal ports is reduced, and the effect of reducing the cost is achieved; the number of touch control source lines in the non-display area is greatly reduced, and a narrow frame is realized; the problem that the touch control accuracy is reduced due to the fact that the touch control area is increased due to the fact that the number of the touch control signal ports is insufficient can be solved, and the touch control accuracy is improved. In the embodiment of the invention, in the touch control stage, the common voltage source line still transmits the first voltage signal to the touch control electrode block which does not transmit the touch control signal, so that the driving uniformity of touch control is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a touch display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multiplexing unit in an embodiment of the invention;
fig. 3 is a schematic diagram of a first switch device group in the embodiment of the present invention;
fig. 4 is a schematic diagram of a touch display panel according to an embodiment of the invention;
fig. 5 is a driving timing diagram of fig. 4;
fig. 6 is a schematic diagram of a touch display panel according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of a touch display panel according to an embodiment of the present invention. The touch display panel provided by the embodiment includes: a display area 1 and a non-display area 2 surrounding the display area 1; the display area 1 comprises a plurality of touch signal lines 11, a plurality of common voltage signal lines 13 and a plurality of touch electrode blocks 12 arranged in an array, wherein one touch electrode block 12 is electrically connected with one touch line group 11a, one touch electrode block 12 is also electrically connected with one common voltage line group 13a, the touch line group 11a comprises at least one touch signal line 11, and the common voltage line group 13a comprises at least one common voltage signal line 13;
the non-display area 2 comprises a plurality of touch control source lines 21 and a multi-path selection circuit 3, the multi-path selection circuit 3 comprises a plurality of multi-path selection units 31, the input end of one multi-path selection unit 31 is correspondingly arranged and electrically connected with one touch control source line 21, the multi-path selection unit 31 is provided with m output ends, the m output ends of one multi-path selection unit 31 are respectively and electrically connected with touch control line groups 11a corresponding to m adjacent touch control electrode blocks 12 in a row, and m is not less than 2 and is an integer;
the non-display area 2 further comprises m public voltage source lines 41 and m public voltage switch control lines 42, the ith public voltage switch control line controls the ith public voltage source line to be simultaneously conducted or simultaneously cut off with transmission paths of a plurality of public voltage line groups 13a corresponding to the km + i row of touch electrode blocks, i is more than or equal to 1 and less than or equal to m, and k is a natural number;
in the touch control stage, the multi-channel selection unit 31 turns on the signal transmission paths of the input terminal and one of the output terminals thereof to enable the touch control line group 11a to transmit the touch control signal, and for at least one touch control electrode block 12 not transmitting the touch control signal, at least one common voltage switch control line 42 controls the transmission paths of the corresponding common voltage source line 41 and the common voltage line group 13a to be turned on simultaneously to enable the common voltage line group 13a to transmit the first voltage signal;
in the display phase, each common voltage switch control line 42 controls the corresponding common voltage source line 41 to be turned on simultaneously with the common voltage line group 13a so that the common voltage line group 13a transmits the common voltage signal.
As shown in fig. 1, one touch line group 11a may be selected to include one touch signal line 11, and one touch electrode block 12 is electrically connected to one touch signal line 11 correspondingly, and at this time, one touch signal line 11 is also characterized as one touch line group 11 a; in the touch stage, a touch signal is transmitted between the touch signal line 11 and the corresponding electrically connected touch electrode block 12. In other embodiments, one touch line group may further include at least two touch signal lines, and one touch electrode block is electrically connected to the two touch signal lines; and in the touch control stage, the two touch control signal lines simultaneously transmit touch control signals with the same touch control electrode block which is correspondingly and electrically connected. It can be understood that, in the present invention, the specific number of the touch signal lines included in the touch line groups is not specifically limited, the number of the touch signal lines included in each touch line group may be the same or different, and related practitioners may reasonably set the number of the touch signal lines included in each touch line group according to needs of products.
As shown in fig. 1, one common voltage line group 13a may be selected to include one common voltage signal line 13, and one touch electrode block 12 is electrically connected to one common voltage signal line 13 correspondingly, at this time, one common voltage signal line 13 is also characterized as one common voltage line group 13 a; in the display stage, the touch signal is transmitted between the common voltage signal line 13 and the touch electrode block 12 electrically connected correspondingly. In other embodiments, one common voltage line group may further include at least two common voltage signal lines, and one touch electrode block is electrically connected to the two common voltage signal lines. It is to be understood that the specific number of the common voltage signal lines included in the common voltage line group is not particularly limited in the present invention, the number of the common voltage signal lines included in each common voltage line group may be the same or different, and the related practitioner may reasonably set the number of the common voltage signal lines included in each common voltage line group according to the product requirement.
In this embodiment, the touch display panel includes a display area 1 and a non-display area 2, where the display area 1 is a display function area, and a plurality of sub-pixels (not shown) for displaying and emitting light are disposed therein; the non-display area 2 is an external circuit area in which a display driving circuit (not shown) and a touch driving circuit (not shown) for performing touch control and display control, and the like are provided, and a specific configuration and wiring description are not made in the present invention.
In this embodiment, the display area 1 includes a plurality of touch signal lines 11, a plurality of common voltage signal lines 13, and a plurality of touch electrode blocks 12 arranged in an array, one touch electrode block 12 is electrically connected to one touch line group 11a, the touch line group 11a includes at least one touch signal line 11, the touch driving capability can be enhanced when the plurality of touch signal lines 11 exist in the touch line group 11a, one touch electrode block 12 is electrically connected to one common voltage line group 13a, the common voltage line group 13a includes at least one common voltage signal line 13, and the display driving capability can be enhanced when the plurality of common voltage signal lines 13 exist in the common voltage line group 13 a. It is understood that the trace electrically connecting the touch electrode block 12 and the multiplexing unit 31 can be defined as the touch signal line 11, and the trace electrically connecting the touch electrode block 12 and the common voltage source line can be defined as the common voltage signal line 13.
In this embodiment, the non-display region 2 includes a plurality of touch source lines 21 and a multi-path selection circuit 3, the multi-path selection circuit 3 includes a plurality of multi-path selection units 31, one multi-path selection unit 31 is disposed corresponding to one touch source line 21, the multi-path selection unit 31 has m output terminals, and one output terminal of the multi-path selection unit 31 is electrically connected to one touch line group 11 a. Here, one multiplexing unit 31 corresponds to one touch source line 21, and one multiplexing unit 31 is electrically connected to m touch line groups 11a, so that one touch source line 21 can implement touch signal transmission with m touch electrode blocks 12 in a time-sharing manner.
The touch source line 21 is electrically connected to the touch signal ports of the touch driving circuit, the more the number of the ports of the touch driving circuit is, the higher the cost is, and under the condition that the number of the touch electrode blocks 12 is the same, the number of the touch signal ports of the touch driving circuit is reduced, so that the effect of reducing the cost is achieved. The touch control signal transmission is realized by one touch control source line in a time-sharing mode and the m touch control electrode blocks, the number of the touch control source lines is greatly reduced, the occupied frame area can be reduced, and the narrow frame is realized. For a medium-size and large-size touch display panel, the situation that a touch signal port is insufficient may exist in the prior art, and at this time, part of the touch electrode blocks do not participate in touch control, so that the touch control area of the touch electrode blocks is increased and the touch control accuracy is low; in the embodiment, one touch control source line realizes touch control signal transmission with m touch control electrode blocks in a time-sharing manner, full-screen touch control is realized, the problem of low touch control precision caused by insufficient number of touch control signal ports can be solved, and the touch control precision is improved.
In this embodiment, the non-display region 2 further includes m common voltage source lines 41, which are the 1 st to mth common voltage source lines VCOM, respectively, and m common voltage switch control lines 42, which are the 1 st to mth common voltage switch control lines VSW, respectively. The 1 st common voltage switch control line controls the 1 st common voltage source line to be simultaneously switched on or switched off with the transmission paths of the plurality of common voltage line groups 13a corresponding to the km +1 th row of touch electrode blocks, the 1 st row of common voltage source lines, the (m + 1) th row of common voltage source lines, the (2 m + 1) th row of common voltage source lines, and so on. By analogy, the ith common voltage switch control line controls the ith common voltage source line and the transmission paths of the plurality of common voltage line groups 13a corresponding to the km + i-th row of touch electrode blocks to be simultaneously switched on or switched off. I is more than or equal to 1 and less than or equal to m, and k is a natural number. In the display stage, one row of touch electrode blocks simultaneously transmit a common voltage signal; and in the touch control stage, a row of touch control electrode blocks simultaneously transmit touch control signals.
As shown in fig. 1, taking m as 2 as an example, the 1 st common voltage switch control line VSW1 controls the 1 st common voltage source line VCOMA to be turned on or turned off simultaneously with the transmission paths of the plurality of common voltage line groups 13a corresponding to the odd-numbered row touch electrode blocks 12; the 2 nd common voltage switch control line VSW2 controls the 2 nd common voltage source line VCOMB to be turned on or off simultaneously with the transmission paths of the plurality of common voltage line groups 13a corresponding to the even-numbered row touch electrode blocks 12.
In other embodiments, taking m as 3 as an example, the 1 st common voltage switch control line controls the 1 st common voltage source line to be simultaneously turned on or off with the 1 st, 4 th, 7 th, and so on, and the transmission paths of the plurality of common voltage line groups 13a corresponding to the km +1 th row of touch electrode blocks are simultaneously turned on or off; the 2 nd common voltage switch control line controls the 2 nd common voltage source line to be simultaneously conducted or simultaneously cut off with the 2 nd line, the 5 th line, the 8 th line and the like, and the transmission paths of the plurality of common voltage line groups 13a corresponding to the km +2 th line touch electrode block are simultaneously conducted or simultaneously cut off; and the 3 rd common voltage switch control line controls the 3 rd common voltage source line to be simultaneously switched on or switched off with the transmission paths of the plurality of common voltage line groups 13a corresponding to the km +3 th row of touch electrode blocks in the 3 rd row, the 6 th row, the 9 th row and the like.
In this embodiment, m output terminals of each multi-channel selection unit 31 are electrically connected to m touch line groups 11a corresponding to m adjacent touch electrode blocks 12 in the same row, specifically, for one multi-channel selection unit 31, m output terminals thereof are electrically connected to m touch line groups 11a corresponding to m adjacent touch electrode blocks 12 in the same row in sequence.
As shown in fig. 1, the optional multiplexing circuit 31 has 2 outputs. The exemplary touch display panel includes 4 × 3 touch electrode blocks 12, and the touch display panel includes 6 multiplexing units 31, where 2 output terminals of one multiplexing unit 31 are electrically connected to 2 touch line groups 11a corresponding to 2 adjacent touch electrode blocks 12 in the same row in sequence. The touch display panel includes two common voltage source lines 41 and two common voltage switch control lines 42, the 1 st common voltage switch control line VSW1 controls the 1 st common voltage source line VCOMA to be electrically connected to the common voltage line group 13a corresponding to the odd-numbered row of touch electrode blocks 12, and the 2 nd common voltage switch control line VSW2 controls the 2 nd common voltage source line VCOMB to be electrically connected to the common voltage line group 13a corresponding to the even-numbered row of touch electrode blocks 12.
In this embodiment, the touch stage includes m touch sub-stages.
In the 1 st touch sub-stage, the multi-path selection unit 31 connects the signal transmission paths between the input terminal and the 1 st output terminal thereof to enable the touch line set 11a to transmit the touch signal; meanwhile, for at least one touch electrode block 12 which does not transmit a touch signal, at least one common voltage switch control line 42 controls the corresponding common voltage source line 41 to be simultaneously conducted with the transmission path of the common voltage line group 13a so that the common voltage line group 13a transmits a first voltage signal. In the touch display panel, at the touch sub-stage, there is a touch electrode block for receiving the first voltage signal in addition to the touch electrode block for transmitting the touch signal. The selectable first voltage signal is the same as the touch signal, and the common voltage source line transmits the first voltage signal to the touch electrode block in the touch stage, so that the driving capability of the touch electrode block can be enhanced, and the overall display uniformity is improved.
In the 2 nd touch sub-stage, the multi-path selection unit 31 conducts the signal transmission paths between the input terminal and the 2 nd output terminal thereof to enable the touch line group 11a to transmit the touch signal; meanwhile, for at least one touch electrode block 12 which does not transmit a touch signal, at least one common voltage switch control line 42 controls the corresponding common voltage source line 41 to be simultaneously conducted with the transmission path of the common voltage line group 13a so that the common voltage line group 13a transmits a first voltage signal.
By analogy, full-screen touch detection of the whole panel is realized.
It is understood that the touch signal includes a touch driving signal and a touch sensing signal. In the touch control stage, the touch control source line transmits a touch control driving signal to a touch control electrode block electrically connected with the touch control source line through the touch control line group, and the touch control electrode block outputs a touch control sensing signal to the touch control source line through the touch control line group. After the M touch sub-stages are completed, the touch driving circuit determines the touch position according to the touch driving signal and the touch sensing signal of the touch electrode block.
As shown in fig. 1, m is 2, the multiplexing unit 31 is electrically connected to the touch line group 11a of 2 adjacent touch electrode blocks 12 in the same column, wherein a first output terminal of the multiplexing unit 31 is electrically connected to the touch line group 11a of the odd-numbered touch electrode blocks 12, and a second output terminal of the multiplexing unit 31 is electrically connected to the touch line group 11a of the even-numbered touch electrode blocks 12. The touch stage is divided into 2 touch sub-stages.
In the 1 st touch sub-stage, each multi-path selection unit 31 turns on the signal transmission path between its input terminal and its first output terminal, and the touch source line 21 transmits the touch signal with the odd-numbered rows of touch electrode blocks 12 through the touch line group 11a, so that in the 1 st touch sub-stage, the first row of touch electrode blocks 12 and the third row of touch electrode blocks 12 perform touch at the same time. Meanwhile, the 2 nd common voltage switch control line can control the 2 nd common voltage source line and the even-numbered rows of touch electrode blocks to realize the transmission of the first voltage signal. At this time, the odd-numbered rows of touch electrode blocks transmit the touch signals, and the even-numbered rows of touch electrode blocks transmit the first voltage signals, so that the driving uniformity of the whole panel can be improved.
In the 2 nd touch sub-stage, each multi-path selection unit 31 turns on the signal transmission path between its input terminal and its second output terminal, and the touch source line 21 transmits the touch signal with the even-numbered rows of touch electrode blocks 12 through the touch line group 11a, so that in the 2 nd touch sub-stage, the second row of touch electrode blocks 12 and the fourth row of touch electrode blocks 12 perform touch control simultaneously. Meanwhile, the 1 st common voltage switch control line can control the 1 st common voltage source line and the odd-numbered row touch electrode blocks to realize the transmission of the first voltage signal. At this time, the odd-numbered rows of touch electrode blocks transmit the first voltage signal, and the even-numbered rows of touch electrode blocks transmit the touch signal, so that the driving uniformity of the whole panel can be improved.
Therefore, full-screen touch detection is achieved through time-sharing touch of the multiple touch sub-stages.
And in the display stage, the touch display panel realizes the display function. And in the display stage, each common voltage switch control line conducts a signal transmission path between a common voltage source line and the touch electrode block, so that common voltage signal transmission is realized between the common voltage source line and the touch electrode block.
In the embodiment, one multi-path selection unit is provided with m output ends, one touch control source line can realize touch control signal transmission with m touch control electrode blocks in a time-sharing manner, the number of touch control signal ports is reduced, and the effect of reducing the cost is achieved; the number of touch control source lines in the non-display area is greatly reduced, and a narrow frame is realized; the problem that the touch control accuracy is reduced due to the fact that the touch control area is increased due to the fact that the number of the touch control signal ports is insufficient can be solved, and the touch control accuracy is improved. In this embodiment, in the touch control stage, the common voltage source line still transmits the first voltage signal to the touch control electrode block which does not transmit the touch control signal, so that the driving uniformity of touch control is enhanced.
Exemplarily, on the basis of the foregoing technical solution, the selectable touch display panel shown in fig. 2 further includes: m touch switch control line groups 5; the multi-path selection unit 31 includes m first switch device groups 311, the output end of the same first switch device group 311 is electrically connected to the same touch control line group 11a, the input end of the same first switch device group 311 is electrically connected to the same touch control source line 21, the control end of the same first switch device group 311 is electrically connected to the same touch control switch control line group 5, and the control end of the first switch device group 311 corresponding to one row of touch control electrode block 12 is electrically connected to the same touch control switch control line group 5; the m touch switch control line groups 5 control the m first switch device groups 311 in the multi-path selection unit 31 to be turned on in a time-sharing manner.
In this embodiment, one touch line group 11a corresponds to one first switch device group 311, and the input end of each first switch device group 311 in the multi-path selection unit 31 is electrically connected to the same touch source line 21; the first switch device group 311 is used to turn on or off a transmission path between the touch source line 21 and the touch line group 11 a. Specifically, the touch switch control line group 5 controls whether the transmission path of the first switch device group 311 is turned on or off, and the touch switch control line group 5 controls the first switch device group 311 to be turned on or off to turn on or off the transmission path between the touch source line 21 and the touch line group 11 a.
It is understood that the m touch switch control line groups 5 are sequentially labeled as the 1 st to m touch switch control line groups, and the m first switch device groups 311 in the multi-path selection unit 31 are sequentially labeled as the 1 st to m first switch device groups. The 1 st touch switch control line group 5 is electrically connected to the control terminal of the 1 st first switch device group 311 in each circuit selection unit 31, the 2 nd touch switch control line group 5 is electrically connected to the control terminal of the 2 nd first switch device group 311 in each circuit selection unit 31, the 3 rd touch switch control line group 5 is electrically connected to the control terminal of the 3 rd first switch device group 311 in each circuit selection unit 31, and so on to the mth touch switch control line group.
In this embodiment, the control terminals of the first switch device groups 311 corresponding to one row of the touch electrode blocks 12 are electrically connected to the same touch switch control line group 5, and one touch switch control line group 5 can control the first switch device groups 311 corresponding to at least one row of the touch electrode blocks 12 to be turned on or off. The m touch switch control line groups 5 control the m first switch device groups 311 in the multiple-path selection unit 31 to be turned on in a time-sharing manner, specifically, taking m as 3 as an example, the 1 st touch switch control line group 5 controls the 1 st first switch device group 311 in each multiple-path selection unit 31 to be turned on at the same time, and then the 1 st, 4 th, 7 th and so on are performed, so that the multiple touch electrode blocks 12 and the touch source line 21 realize touch signal transmission; the 2 nd touch switch control line group 5 controls the 2 nd first switch device group 311 in each multi-path selection unit 31 to be simultaneously conducted, and then the 2 nd row, the 5 th row, the 8 th row and so on are performed, so that the multi-row touch electrode blocks 12 and the touch source lines 21 realize touch signal transmission; the 3 rd touch switch control line group 5 controls the 3 rd first switch device group 311 in each multi-path selection unit 31 to be turned on simultaneously, and then the 3 rd row, the 6 th row, the 9 th row and so on are performed, so that the multi-row touch electrode blocks 12 and the touch source lines 21 realize touch signal transmission.
Optionally, the first switch device groups 311 in the multi-path selection circuit 3 are all NMOS or all PMOS. Given that the touch switch control line group 5 controls the corresponding electrically connected first switch device groups 311 to be turned on simultaneously, the types of the corresponding electrically connected first switch device groups 311 to one touch switch control line group 5 are the same, such as all NMOS or all PMOS.
If the first switch device group 311 is an NMOS, the effective pulse signal of the touch switch control line group 5 is at a high level; alternatively, if the first switch device group 311 is PMOS, the active pulse signal of the touch switch control line group 5 is at low level.
As shown in fig. 3, one of the first switch device groups 311 may include n switch groups 31a, one switch group 31a includes at least one first transistor, one touch switch control line group 5 includes n touch switch control lines, and the control terminals of the first transistors of the same switch group 31a are connected to the same touch switch control line.
Alternatively, n is 3, that is, the first switch device group 311 includes 3 switch groups 31a, and the number of the first transistors in the 3 switch groups 31a may be the same or different. The touch switch control line group 5 includes 3 touch switch control lines respectively labeled as G1, G2, and G3, and the control terminals of the first transistors of the same switch group 31a are connected to the same touch switch control line.
In this embodiment, a structure of one first switch device group 311 is shown, where an input end of the first switch device group 311 is electrically connected to the touch source line 21 corresponding to the multi-way selection unit 31, and an input end of each first transistor in the first switch device group 311 is electrically connected to the touch source line 21 corresponding to the multi-way selection unit 31. The output terminal of the first switch device group 311 is electrically connected to one touch line group 11a, and the output terminal of each first transistor in the first switch device group 311 is electrically connected to the touch line group 11a corresponding to the first switch device group 311.
In this embodiment, the first switch device group 311 includes a plurality of switch groups 31a, and each touch switch control line independently controls whether the corresponding switch group 31a is turned on or not. Specifically, when the touch switch control line group 5 controls the conduction of the transmission path of the first switch device group 311, at least one of the touch switch control lines controls the conduction of the transmission path of the corresponding switch group 31 a. For example, when the touch switch control line group 5 controls the transmission path of the first switch device group 311 to be turned on, at least one touch switch control line of G1, G2, and G3 outputs a high-level signal to control the first transistor of at least one switch group 31a to be turned on, wherein the first transistors are all selected to be NMOS. In other embodiments, the first transistors may be both NMOS or both PMOS.
In this embodiment, the number of the first transistors in the first switch device group 311 can be selected according to power consumption or performance requirements, so that the touch driving capability can be adjusted.
Alternatively, as shown in fig. 4, m is 2; the m common voltage switch control lines include a first common voltage switch control line VSW1 and a second common voltage switch control line VSW 2; the m touch switch control line groups 5 include a first switch control line group 51 and a second switch signal line group 52; the first common voltage switch control line VSW1 controls the first common voltage source line VCOMA to be turned on or turned off simultaneously with the transmission path of the common voltage line group 13a corresponding to the odd-numbered row of touch electrode blocks 12; the second common voltage switch control line VSW2 controls the second common voltage source line VCOMB to be turned on or turned off simultaneously with the transmission path of the common voltage line group 13a corresponding to the even-numbered row of touch electrode blocks 12; the touch control stage comprises a first touch control stage and a second touch control stage; in the first touch phase, the first switch control line group 51 controls the conduction of the transmission path between the touch source line 21 and the odd-numbered row of touch electrode blocks 12 to enable the touch line group 11a to transmit the touch signal, and at the same time, the second common voltage switch control line VSW2 controls the conduction of the second common voltage source line VCOMB and the transmission path of the even-numbered row of common voltage line group 13a to enable the common voltage line group 13a to transmit the first voltage signal; in the second touch phase, the second switch control line group 52 controls the conduction of the transmission path between the touch source line 21 and the even-numbered row touch electrode block 12 to enable the touch line group 11a to transmit the touch signal, and at the same time, the first common voltage switch control line VSW1 controls the conduction of the first common voltage source line VCOMA and the transmission path of the odd-numbered row common voltage line group 13a to enable the common voltage line group 13a to transmit the first voltage signal. The waveform of the first voltage signal is selected to be the same as that of the touch signal.
In this embodiment, only the schematic structural diagram of the multi-path selecting unit 31 corresponding to two adjacent touch electrode blocks 12 in the same column is shown. The structure of the first switch device group 311 in the multiplexing unit 31 is represented by transistors, and in essence, the first switch device group 311 includes a plurality of sets of transistors.
And m is 2, the multiplexing unit 31 includes two first switch device groups 311, wherein a control terminal of the first switch device group 311 electrically connected to the touch electrode block 12 in the odd-numbered row of each multiplexing unit 31 is connected to the same first switch signal line group 51, and a control terminal of the first switch device group 311 electrically connected to the touch electrode block 12 in the even-numbered row of each multiplexing unit 31 is connected to the same second switch signal line group 52. The effective pulse signal output by the first switch signal line group 51 controls each touch source line 21 to transmit a touch signal to the odd-numbered rows of touch electrode blocks 12; the effective pulse signal output by the second switch signal line group 52 controls each touch source line 21 to transmit the touch signal to the touch electrode blocks 12 in the even rows.
In the touch stage, the odd-numbered row touch electrode blocks 12 and the even-numbered row touch electrode blocks 12 perform touch detection in a time-sharing manner. The touch control stage comprises a first touch control stage and a second touch control stage. Fig. 5 shows a driving timing chart of fig. 4. The optional first transistors are all NMOS.
In the first touch phase TPA, the first switch control line group 51 (labeled as TP-MUX1) outputs a high level signal to control the first switch device group 311 electrically connected thereto to be turned on, so that the transmission path between the touch source line 21 and the odd-numbered row touch electrode block 12 is turned on, and the touch source line 21 (labeled as SX) transmits a touch signal to the touch line group 11a corresponding to the odd-numbered row touch electrode block 12. The second switch control line group 52 (labeled TP-MUX2) and the first common voltage switch control line VSW1 each output a low level signal. Meanwhile, the second common voltage switch control line VSW2 is a high level signal to control the transmission path of the second common voltage source line VCOMB and the even-numbered row common voltage line group 13a to be simultaneously turned on so that the common voltage line group 13a transmits the first voltage signal, where the first voltage signal has the same waveform as the touch signal, and then in the first touch phase, the odd-numbered row touch electrode blocks 12 transmit the touch signal, and the even-numbered row touch electrode blocks 12 transmit the first voltage signal having the same waveform as the touch signal, so that the whole-area touch driving uniformity in the touch phase can be realized, and the touch performance can be improved.
In the second touch phase TPB, the second switch control line group 52 outputs a high level signal to control the first switch device group 311 electrically connected thereto to be turned on, so that the transmission path between the touch source line 21 and the even-numbered touch electrode blocks 12 is turned on, and the touch source line 21 transmits a touch signal to the touch line group 11a corresponding to the even-numbered touch electrode blocks 12. The first switch control line group 51 and the second common voltage switch control line VSW2 each output a low-level signal. Meanwhile, the first common voltage switch control line VSW1 is a high level signal, and controls the transmission path of the first common voltage source line VCOMA and the odd-numbered row common voltage line group 13a to be simultaneously turned on so that the common voltage line group 13a transmits the first voltage signal, where the first voltage signal has the same waveform as the touch signal, in the second touch phase, the even-numbered row touch electrode blocks 12 transmit the touch signal, and the odd-numbered row touch electrode blocks 12 transmit the first voltage signal having the same waveform as the touch signal, so that the whole-area touch driving uniformity in the touch phase can be realized, and the touch performance can be improved.
And in the display stage, the touch display panel realizes the display function. In the display phase, the first switch control line group 51 and the second switch control line group 52 are both at low level; the first common voltage switch control line VSW1 is high to control the first common voltage source line VCOMA to be simultaneously turned on with the transmission path of the odd-numbered row common voltage line group 13a to make the common voltage line group 13a transmit the common voltage signal, and at the same time, the second common voltage switch control line VSW2 is high to control the second common voltage source line VCOMB to be simultaneously turned on with the transmission path of the even-numbered row common voltage line group 13a to make the common voltage line group 13a transmit the common voltage signal.
Exemplarily, on the basis of the above technical solution, the non-display region 2 shown in fig. 6 may include a first non-display region and a second non-display region that are oppositely disposed and located at two sides of the display region 1, a driving chip 4 is disposed in the first non-display region, the driving chip 4 includes a plurality of touch signal output terminals, and one touch signal output terminal is electrically connected to one touch source line 21.
In this embodiment, the long side direction of the display region 1 includes a first side and a second side which are oppositely disposed, the non-display region 2 located at the periphery of the first side of the display region 1 is defined as a first non-display region, and the non-display region 2 located at the periphery of the second side of the display region 1 is defined as a second non-display region. The selectable first non-display area is located on the lower side in the illustration of the display area 1 as shown in fig. 6, and the second non-display area is located on the upper side in the illustration of the display area 1.
The selectable driving chip 4, the multi-path selection circuit 3, the touch control source line 21 and other structures are arranged in the first non-display area. The selectable multi-path selection circuit 3 is positioned in the first non-display area and on one side of the driving chip 4 close to the display area 1, and the m common voltage source lines and the m common voltage switch control lines are positioned in the second non-display area. Compared with the prior art, m touch electrode blocks are driven by one touch source line in a time-sharing touch mode, the wiring number of the touch source lines is effectively reduced, the cost of the driving chip 4 is further reduced, and the narrow frame is realized.
An optional common voltage source line and a common voltage switch control line are disposed in the second non-display region. In this embodiment, two common voltage source lines are disposed in the second non-display region, which has an effect that the detection of the touch display panel can be achieved by applying different signals to the two common voltage source lines, and in practical application, the display function of the touch display panel can be achieved by applying the same common voltage signal to the two common voltage source lines. The design of the common voltage source line and the common voltage switch control line is compatible with the test requirement before the factory leaves the factory in the early stage and the use requirement after the factory leaves the factory in the later stage.
In this embodiment, the number of touch signal output ends is reduced, and the frame is further reduced. Specifically, the touch electrode blocks receive touch signals in groups, for example, the touch electrode blocks in odd rows in the same column are controlled to be simultaneously turned on or turned off; and the even-numbered rows of touch electrode blocks in the same column are simultaneously opened or closed, so that the grouping control is realized. This can enhance touch performance.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, and as shown in fig. 7, the display device 100 provided in this embodiment includes the touch display panel described in any of the above embodiments. Optionally, the display device 100 may be applied in a vehicle as an on-board display product, specifically, as a screen of a main control area of the vehicle for a user to use.
In other embodiments, the optional display device may be applied to a smart phone, a tablet computer, or the like, and the optional display device may be an organic light emitting display device or a liquid crystal display device or other types of display devices. The above embodiments simply illustrate the structure of the touch display panel in the display device, and the display device substantially includes other structures, which are not specifically illustrated and described herein. In addition, in the above embodiments, m is often illustrated as 2, in other embodiments, m may be selected as another numerical value, and when m changes, the number of traces or circuit structures related to the value of m changes, which is not specifically illustrated and described herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A touch display panel, comprising: a display area and a non-display area surrounding the display area;
the display area comprises a plurality of touch signal lines, a plurality of common voltage signal lines and a plurality of touch electrode blocks which are arranged in an array mode, one touch electrode block is electrically connected with one touch line group, one touch electrode block is also electrically connected with one common voltage line group, the touch line group comprises at least one touch signal line, and the common voltage line group comprises at least one common voltage signal line;
the non-display area comprises a plurality of touch control source lines and a multi-path selection circuit, the multi-path selection circuit comprises a plurality of multi-path selection units, the input end of one multi-path selection unit is correspondingly arranged and electrically connected with one touch control source line, the multi-path selection unit is provided with m output ends, the m output ends of one multi-path selection unit are respectively and electrically connected with the touch control line groups corresponding to the adjacent m touch control electrode blocks in a row, and m is not less than 2 and is an integer;
the non-display area further comprises m public voltage source lines and m public voltage switch control lines, the ith public voltage switch control line controls the ith public voltage source line and transmission paths of a plurality of public voltage line groups corresponding to the touch electrode blocks in the km + i row to be simultaneously conducted or simultaneously cut off, i is more than or equal to 1 and less than or equal to m, and k is a natural number;
in the touch control stage, the multi-channel selection unit conducts a signal transmission path between an input end and one output end of the multi-channel selection unit to enable the touch control line group to transmit a touch control signal, and meanwhile, for at least one touch control electrode block which does not transmit the touch control signal, at least one common voltage switch control line controls the common voltage source line corresponding to the multi-channel selection unit and the transmission path of the common voltage line group to be simultaneously conducted to enable the common voltage line group to transmit a first voltage signal;
in the display stage, each common voltage switch control line controls the common voltage source line corresponding to the common voltage switch control line to be simultaneously conducted with the common voltage line group so as to enable the common voltage line group to transmit a common voltage signal.
2. The touch display panel according to claim 1, further comprising: m touch switch control line groups;
the multi-path selection unit comprises m first switch device groups, the output end of the same first switch device group is electrically connected with the same touch wire group, the input end of the same first switch device group is electrically connected with the same touch source wire, the control end of the same first switch device group is electrically connected with the same touch switch control wire group, and the control end of the first switch device group corresponding to one row of touch electrode blocks is electrically connected to the same touch switch control wire group;
and the m touch switch control line groups control m first switch devices in the multi-path selection unit to be conducted in a time-sharing mode.
3. The touch display panel of claim 2,
the first switch device groups in the multi-path selection circuit are all NMOS or all PMOS.
4. The touch display panel according to claim 2, wherein one of the first switch device groups includes n switch groups, one of the switch groups includes at least one first transistor, one of the touch switch control line groups includes n touch switch control lines, and control terminals of the first transistors of the same switch group are connected to the same touch switch control line.
5. The touch display panel of claim 4,
the first transistors are all NMOS or PMOS.
6. The touch display panel of claim 2, wherein m is 2;
the m public voltage switch control lines comprise a first public voltage switch control line and a second public voltage switch control line; the m touch switch control line groups comprise a first switch control line group and a second switch signal line group;
the first common voltage switch control line controls the first common voltage source line to be simultaneously conducted or simultaneously cut off with the transmission path of the common voltage line group corresponding to the touch electrode blocks in odd rows; the second common voltage switch control line controls the second common voltage source line to be simultaneously conducted or simultaneously cut off with the transmission path of the common voltage line group corresponding to the touch electrode blocks in even rows;
the touch control stage comprises a first touch control stage and a second touch control stage;
in the first touch control stage, the first switch control line group controls the conduction of transmission paths between the touch control source lines and the touch control electrode blocks in odd rows so that the touch control line group transmits touch control signals, and meanwhile, the second common voltage switch control line controls the conduction of the transmission paths between the second common voltage source lines and the common voltage line groups in even rows so that the common voltage line groups transmit first voltage signals;
in the second touch control stage, the second switch control line group controls the conduction of the transmission paths between the touch control source lines and the touch control electrode blocks in the even rows so that the touch control line group transmits touch control signals, and meanwhile, the first common voltage switch control line controls the conduction of the transmission paths between the first common voltage source lines and the common voltage line groups in the odd rows so that the common voltage line groups transmit first voltage signals.
7. The touch display panel according to claim 1 or 6, wherein the first voltage signal has the same waveform as the touch signal.
8. The touch display panel of claim 1, wherein the non-display area comprises a first non-display area and a second non-display area disposed oppositely and located at two sides of the display area,
the first non-display area is internally provided with a driving chip, the driving chip comprises a plurality of touch signal output ends, and one touch signal output end is electrically connected with one touch source line.
9. The touch display panel according to claim 8, wherein the multiplexing circuit is located in the first non-display region and on a side of the driving chip close to the display region, and the m common voltage source lines and the m common voltage switch control lines are both located in the second non-display region.
10. A display device comprising the touch display panel according to any one of claims 1 to 9.
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