CN106775098B - Touch display panel, display device and driving method - Google Patents
Touch display panel, display device and driving method Download PDFInfo
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- CN106775098B CN106775098B CN201611230216.2A CN201611230216A CN106775098B CN 106775098 B CN106775098 B CN 106775098B CN 201611230216 A CN201611230216 A CN 201611230216A CN 106775098 B CN106775098 B CN 106775098B
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- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 4
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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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Abstract
The application discloses a touch display panel, a display device comprising the touch display panel and a method for driving the touch display panel. The touch display panel comprises N first touch electrodes, a plurality of switch units and an integrated drive circuit; each first touch electrode comprises a thermistor part; one end of the first end and the second end of the first touch electrode is electrically connected with the integrated driving circuit, and the other end of the first end and the second end of the first touch electrode is electrically connected with the integrated driving circuit through a switch unit; when the switch unit is closed, the first touch electrode is reused as a thermistor, and the integrated driving circuit sends a detection voltage signal to the first touch electrode. According to the embodiment, the resistance value is determined by collecting the voltage of the first touch electrode, and then the temperature distribution condition is monitored, so that the influence of the first touch electrode on the touch capacitor due to the deformation of the temperature is improved by determining the compensation value, and the uniformity of the change of the touch capacitor is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a touch display panel, a display device and a driving method.
Background
In the mutual capacitance touch display screen, the touch transmitting electrodes and the touch receiving electrodes on the display panel are generally arranged in a crossing manner in the display area, and mutual capacitance is formed at the crossing point. Upon touch, the amount of charge stored by the mutual capacitance at the touch location changes. Therefore, the touch position can be determined according to the intersection point where the signal intensity sensed by the mutual capacitance changes, and therefore the touch function is achieved.
Integrated driver circuits and backlights are also typically included in the display panel. The integrated driving circuit and the backlight source generate heat during operation, which often causes the ambient temperature to be higher than the normal temperature. There is a phenomenon in which the temperature on the display panel is not uniformly distributed. When the display panel displays for a long time, the touch electrode closer to the integrated driving circuit and the backlight is often affected by temperature and deformed, and then mutual capacitance during touch is affected, so that the image output by the display panel is distorted relative to the input signal.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present application provides an improved touch display panel, a display device and a driving method to solve the technical problems mentioned in the background section above.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a touch display panel. The touch display panel comprises N first touch electrodes, a plurality of switch units and an integrated drive circuit, wherein N is a positive integer; each first touch electrode comprises a thermistor part; one end of the first end and the second end of the first touch electrode is electrically connected with the integrated drive circuit, and the other end of the first end and the second end of the first touch electrode is electrically connected with the integrated drive circuit through a switch unit, wherein the first end is a first side of the first touch electrode in the extension direction, and the second end is a second side of the first touch electrode in the extension direction; when the switch unit is closed, the first touch electrode is reused as a thermistor, and the integrated driving circuit sends a detection voltage signal to the first touch electrode.
In some embodiments, the touch display panel includes a control signal line and a plurality of first touch signal lines; the control signal line is used for sending a control signal to the switch unit; the integrated driving circuit is electrically connected with the first touch electrode through a first touch signal line.
In some embodiments, the switch unit includes a transistor, a gate of the transistor is electrically connected to the control signal line, a first pole of the transistor is electrically connected to the integrated driving circuit, and a second pole of the transistor is electrically connected to the first touch electrode.
In some embodiments, when the switch unit is closed, the first touch signal line is multiplexed as a data transmission signal line for transmitting the detection voltage signal.
In some embodiments, a first end of each first touch electrode is electrically connected to the integrated driving circuit, and a second end of each first touch electrode is electrically connected to the switch unit; or the second end of each first touch electrode is electrically connected with the integrated driving circuit, and the first end of each first touch electrode is electrically connected with the switch unit.
In some embodiments, the first ends of the odd-numbered first touch electrodes are electrically connected to the switch unit, and the second ends of the even-numbered first touch electrodes are electrically connected to the switch unit; or the second ends of the odd-numbered first touch electrodes are electrically connected with the switch unit, and the first ends of the even-numbered first touch electrodes are electrically connected with the switch unit.
In some embodiments, first ends of the 1 st to ith first touch electrodes are electrically connected to the switch unit, and second ends of the (i + 1) th to nth first touch electrodes are electrically connected to the switch unit; or the second ends of the 1 st to ith first touch electrodes are electrically connected with the switch unit, and the first ends of the (i + 1) th to nth first touch electrodes are electrically connected with the switch unit, wherein i is less than or equal to N-1, and i is a positive integer.
In some embodiments, the control signal line includes a first control signal line and a second control signal line; the first control line signal wire is used for sending a control signal to each switch unit electrically connected with the first end of each first touch electrode; the second control line signal line is used for sending a control signal to each switch unit electrically connected with the second end of each first touch electrode.
In some embodiments, the outer edge of each first touch electrode is provided with a thermistor portion.
In some embodiments, each of the first touch electrodes is provided with a thermistor portion near or far from a surface of the touch display panel, and the distribution form of the thermistor portions includes at least one of: straight lines, curved lines, serpentine lines, meshes, and polygons.
In some embodiments, the thermistor portion includes at least one of: PTC positive temperature coefficient thermistor, NTC negative temperature coefficient thermistor and CTR critical temperature thermistor.
In some embodiments, when the switch unit is turned off, the integrated driving circuit sends a touch detection signal to the first touch electrode in a touch detection phase; in the display stage, the first touch electrode is reused as a common electrode, and the integrated driving circuit sends a common voltage signal to the first touch electrode.
In some embodiments, a touch display panel includes a light-shielding layer; the positive projection area of the thermistor part on the touch display panel is positioned in the positive projection area of the shading layer on the touch display panel.
In some embodiments, the touch display panel includes an array substrate and a color film substrate disposed opposite to the array substrate; the first touch electrode is located on the array substrate, the color film substrate is provided with a second touch electrode, and the extending direction of the first touch electrode is intersected with the extending direction of the second touch electrode.
In a second aspect, an embodiment of the present application provides a driving method for driving the touch display panel. The method comprises the following steps: in the voltage detection stage, providing a control signal to the control signal line to close the switch unit, sending a detection voltage signal to the first touch electrode, and determining a compensation value according to the voltage of the first touch electrode; in the touch detection stage, providing a control signal to the control signal line to disconnect the switch unit, sending a touch detection signal to the first touch electrode, and correcting the touch induction signal according to the compensation value; and in the display stage, providing a control signal to the control signal line to disconnect the switch unit and send a common voltage signal to the first touch electrode.
In a third aspect, an embodiment of the present application provides a display device, including the touch display panel.
In the touch display panel and the display device including the touch display panel provided in the embodiments of the present application, one end of each first touch electrode is connected to the integrated driving circuit, and the other end is connected to the integrated driving circuit through one switch unit. When the switch unit is closed, the first touch electrode including the thermistor portion is multiplexed as a thermistor, and the integrated drive circuit transmits a detection voltage signal to the first touch electrode. At the moment, the first touch electrode and the integrated drive circuit form a loop, the temperature distribution condition is obtained by collecting the voltage of the first touch electrode, and the influence of the first touch electrode on the touch capacitance due to the deformation of the temperature is improved by determining a compensation value, so that the uniformity of the change of the touch capacitance is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an embodiment of a touch display panel provided in the present application;
fig. 2 is a schematic structural diagram of an embodiment of a thermistor portion included in a first touch electrode in a touch display panel provided in the present application;
fig. 3 is a schematic structural diagram of another embodiment of a touch display panel provided in the present application;
fig. 4 is a schematic structural diagram of a touch display panel according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a touch display panel according to still another embodiment of the present disclosure;
FIG. 6 is a flow chart of one embodiment of a driving method provided herein;
FIG. 7 is a timing diagram illustrating an operation of the touch display panel provided in the present application;
FIG. 8 is a schematic diagram of one embodiment of a display device provided herein.
Detailed Description
The principles and features of the present application are described in further detail below with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Please refer to fig. 1, which shows a schematic structural diagram of an embodiment of a touch display panel provided in the present application. As shown in the drawings, the touch display panel of the present application includes: n first touch electrodes 11, a plurality of switch units 14, and an integrated driving circuit 13. Wherein N is a positive integer.
In the present embodiment, the first touch electrodes 11 extend along a first direction and are arranged along a second direction. One end of each first touch electrode 11 may be connected to the integrated driving circuit 13; and the other end of each first touch electrode 11 is connected to the integrated driving circuit 13 through a switch unit 14. One end and the other end of each first touch electrode 11 are opposite ends of the first touch electrode in the first direction. As shown in fig. 1, a first terminal of TX1 is connected to the integrated driving circuit 13 through a switch unit 14, and a second terminal of TX1 is connected to the integrated driving circuit 13 through a first touch signal line 12. The first end is a first side of the first touch electrode 11 in the first direction, and the second end is a second side of the first touch electrode 11 in the first direction. Similarly, the first terminals of TX2 and TX3 · TXN are connected to the integrated driving circuit 13 through a switch unit 14, respectively, and the second terminals are connected to the integrated driving circuit 13 through a first touch signal line 12, respectively.
In addition, each first touch electrode 11 includes a thermistor portion 111. The thermistor portion 111 may be located at any area of the first touch electrode 11, such as an outer edge of the first touch electrode and/or a surface of the first touch electrode. The surface may be a surface of the first touch electrode close to or far from the touch display panel. As an example, as shown in (a) and (b) in fig. 2 (the thick line in the figure represents the thermistor portion), the thermistor portion 211 is provided at the outer edge and the surface of the first touch electrode 21. Alternatively, as shown in (c) and (d) of fig. 2, a thermistor portion 211 is provided on the surface of the first touch electrode 21. In the present embodiment, the thermistor portion 111 is disposed at the outer edge of the first touch electrode 11, and completely covers the outer edge of the first touch electrode 11.
As can be seen from fig. 1, the first end of each switch unit 14 is connected to the first end of each first touch electrode 11. While a second terminal of each switching unit 14 is connected to the integrated driving circuit 13. When the switch unit 14 is closed (i.e. in the voltage detection phase), the first end of the first touch electrode 11 is also connected to the integrated driving circuit 13, so that a loop is formed between the first touch electrode 11 and the integrated driving circuit 13. At this time, the integrated drive circuit 13 sends a detection voltage signal to the first touch electrode 11, and the first touch electrode 11 is reused as a thermistor. The integrated driving circuit 13 may determine the voltage drop according to a difference between the transmitted detection voltage signal and the received detection voltage signal, so as to determine the resistance value of the first touch electrode 11, and further determine the temperature condition of the first touch electrode 11 at this time. It is understood that, in the voltage detection stage, the first touch signal line 12 connected to the first touch electrode 11 may be multiplexed as a data transmission signal line for transmitting a detection voltage signal. Therefore, the manufacturing process of the touch display panel is simplified, and the production cost is reduced. In addition, the transmission direction of the detection voltage signal is not limited in the present application, and may be from the first end to the second end of the first touch electrode 11, or may be from the second end to the first end of the first touch electrode 11.
In this embodiment, the touch display panel further includes a control signal line SW. The control signal line SW is used to send a control signal to the switching unit 14. As shown in the drawing, one end of the control signal line SW is connected to the control end of each switch unit 14, and the other end is connected to the integrated drive circuit 13. In the voltage detection phase, the integrated drive circuit 13 sends a control signal (i.e., an on signal) to each switch unit 14 through the control signal line SW.
In some optional implementations of this embodiment, when the switch unit 14 is turned off, in the touch detection phase, the integrated driving circuit 13 may send a touch detection signal to the first touch electrode 11; in the display phase, the first touch electrode 11 may be multiplexed as a common electrode, and the integrated driving circuit 13 sends a common voltage signal thereto.
Optionally, the first end of the first touch electrode 11 may be directly connected to the integrated driving circuit through a first touch signal line, and the second end of the first touch electrode 11 is connected to the integrated driving circuit through a switch unit. It should be noted that the ends of the first touch electrodes connected to the integrated driving circuit may be the same or different. Can be adjusted according to actual needs.
Further, it is to be noted that the thermistor portion 111 may be made of any thermosensitive material. The thermistor portion 111 may include at least one of: PTC positive temperature coefficient thermistor, NTC negative temperature coefficient thermistor and CTR critical temperature thermistor.
As an example, the switching unit 14 may include a transistor. The gate of each transistor is a control terminal of the switching unit 14 and is electrically connected to the control signal line SW; the first terminal of each transistor is the second terminal of the switch unit 14 and is electrically connected with the integrated driving circuit 13; the second pole of each transistor is a first end of the switch unit 14 and is electrically connected to one of the first touch electrodes 11.
In some optional implementations of the embodiment, when the thermistor portion is disposed on a surface of each first touch electrode close to or far from the touch display panel, a distribution form of the thermistor portion may include at least one of: straight lines (as shown in fig. 2 (a)), curved lines, serpentine lines (as shown in fig. 2 (c) and (d)), meshes, and polygons (as shown in fig. 2 (b)).
In the touch display panel of this embodiment, the thermistor portion is disposed on the first touch electrode, and one end of the first touch electrode is connected to the integrated driving circuit, and the other end of the first touch electrode is connected to the integrated driving circuit through a switch unit. When the switch unit is closed, a loop is formed between the integrated drive circuit and the first touch electrode. The integrated drive circuit sends a detection voltage signal to the first touch electrode, and the first touch electrode is multiplexed into a thermistor at the moment. Therefore, by collecting the voltage of the first touch electrode, the resistance value can be determined to obtain the temperature distribution condition, and further determine the compensation value, so that the influence of the first touch electrode on the touch capacitor due to temperature deformation is improved, and the uniformity of the change of the touch capacitor is improved.
Continuing to refer to fig. 3, a schematic structural diagram of another embodiment of the touch display panel provided by the present application is shown. Similar to the embodiment shown in fig. 1, the touch display panel in this embodiment also includes N first touch electrodes 31, an integrated driving circuit 33, and a plurality of switch units 34. And the outer edge of the first touch electrode 31 is provided with a thermistor portion 311.
Unlike the embodiment shown in fig. 1, in the present embodiment, the first ends of the odd-numbered first touch electrodes 31 in the present embodiment are electrically connected to a switch unit 34, and the second ends are connected to the integrated driving circuit 33 through a first touch signal line 32. The first ends of the even-numbered first touch electrodes 31 are connected to the integrated driving circuit 33 through a first touch signal line 32, and the second ends are electrically connected to a switch unit 34. As shown in fig. 3, TX1, TX3, and TX5 are connected to a first terminal of one switching unit 34, respectively; second terminals of TX2, TX4, and TX6 are connected to a first terminal of a switching unit 34, respectively. That is, the first ends of two adjacent first touch electrodes 31 are alternately connected to the switching unit 34 and the integrated driving circuit 33.
The control signal lines in this embodiment further include a first control signal line SWL and a second control signal line SWR. The first control line signal line SWL is used to transmit a control signal to each switch unit 34 electrically connected to the first end of each first touch electrode 31. The second control line signal line SWR is used to send a control signal to each switch unit 34 electrically connected to the second end of each first touch electrode 31. As shown in fig. 3, the first control signal line SWL is connected to the switch unit 34 connected to TX1, TX3, and TX5, and the second control signal line SWR is connected to the switch unit 34 connected to TX2, TX4, and TX 6. In the voltage detection stage, while the independent control of the first touch electrodes in different areas is realized, the coupling effect between the first touch electrodes 31 controlled by the same control signal line can be avoided.
During the voltage detection phase, the integrated driving circuit 33 may send control signals to the first control signal line SWL and the second control signal line SWR at the same time or in a time-sharing manner. For example: the integrated drive circuit 33 sends a control signal to the first control line signal line SWL. At this time, the switch unit 34 connected to the first control line signal line SWL is turned on, so that TX1, TX3, and TX5 may receive the detection voltage signal transmitted by the integrated driving circuit 33. When the detection voltage signal passes through TX1, TX3, and TX5 multiplexed as thermistors, it is lost to some extent. Therefore, the integrated driving circuit 33 can determine the voltage and resistance values of TX1, TX3, and TX5 according to the received detection voltage signal and the transmitted (i.e., initial) detection voltage signal, and further obtain the temperature conditions of TX1, TX3, and TX5 to determine the compensation value.
Optionally, the second ends of the odd-numbered first touch electrodes may be electrically connected to the switch unit, and the first ends of the even-numbered first touch electrodes are electrically connected to the switch unit.
Further referring to fig. 4, a schematic structural diagram of another embodiment of the touch display panel provided in the present application is shown. Similar to the embodiment shown in fig. 3, the touch display panel in this embodiment also includes a plurality of first touch electrodes 41, a plurality of first touch signal lines 42, an integrated driving circuit 43, a plurality of switch units 44, a first control signal line SWL, and a second control signal line SWR. The outer edge of the first touch electrode 41 is provided with a thermistor portion 411.
However, unlike the embodiment shown in fig. 3, the first ends of the 1 st to ith (or the first touch electrodes 41 located on the upper half of the touch display panel) first touch electrodes are respectively connected to the integrated driving circuit 43 through a switch unit 44, and the second ends are respectively connected to the integrated driving circuit 43 through a first touch signal line 42. First ends of the (i + 1) th to nth (or the first ends of the (i + 1) th first touch electrodes 41 located on the lower half portion of the touch display panel) are respectively connected to the integrated driving circuit 43 through a first touch signal line 42, and second ends of the first touch electrodes are respectively connected to the integrated driving circuit 43 through a switch unit 44. Wherein i is less than or equal to N-1, and i is a positive integer.
As shown in fig. 4, first terminals of TX1, TX2 to TXi are respectively connected to the integrated driving circuit 43 through a switch unit 44, and second terminals of TX1, TX2 to TXi are respectively connected to the integrated driving circuit 43 through a first touch signal line 42. First terminals of Txi +1 to TXN-1 and TXN are respectively connected to the integrated driving circuit 43 through a first touch signal line 42, and second terminals of Txi +1 to TXN-1 and TXN are respectively connected to the integrated driving circuit 43 through a switch unit 44. In this embodiment, the alternative layout of the switch unit 44 and the first touch signal line 42 is avoided, which is beneficial to simplifying the production process of the touch display panel and improving the production efficiency.
Optionally, the second ends of the 1 st to ith first touch electrodes may be electrically connected to a switch unit, respectively, and the first ends of the (i + 1) th to nth first touch electrodes are electrically connected to a switch unit, respectively.
Fig. 5 is a schematic structural diagram of a touch display panel according to still another embodiment of the present disclosure. As shown in fig. 5, the touch display panel of the present application includes an array substrate and a color filter substrate disposed opposite to the array substrate. The first touch electrode (51 shown in fig. 5) in the above embodiments is located on the array substrate. The color filter substrate is provided with a second touch electrode 52. The second touch electrodes 52 extend along the second direction and are arranged along the first direction. That is, the extending direction of the first touch electrode 51 intersects with the extending direction of the second touch electrode 52.
In the present embodiment, the outer edge of the first touch electrode 51 is provided with a thermistor portion 511. One end of the first touch electrode 51 is electrically connected to the integrated driving circuit 57 through the first touch signal line 53, and the other end is electrically connected to the integrated driving circuit 57 through the switch unit. The integrated drive circuit sends control signals to the respective switching units through the control signal lines (i.e., the first control signal line 56 and the second control signal line 55) to control the switching units to be turned on or off. Specifically, reference may be made to the embodiment shown in fig. 4, which is not described herein again.
In the present embodiment, the second touch electrode 52 is electrically connected to a flexible circuit board (FPC)59 through a second touch signal line 54. The FPC59 is electrically connected to the integrated drive circuit 57 through the main flexible circuit board 58. It is understood that the first touch electrode 51 and the second touch electrode 52 may be stripe electrodes or grid electrodes. Typically made of a conductive material, which may be a metal electrode or an ITO electrode, for example. Various common fabrication methods may be employed to form the first touch electrode 51 and the second touch electrode 52.
The touch display panel further includes a light shielding layer (not shown). In order not to affect the display effect of the touch display panel, the orthographic projection area of the thermistor part on each first touch electrode on the touch display panel can be located in the orthographic projection area of the shading layer on the touch display panel.
The embodiment of the application also discloses a driving method, which is used for driving the touch display panel in each embodiment. Referring specifically to fig. 6, a flow chart of an embodiment of the driving method provided by the present application is shown. The working process of the touch display panel comprises a voltage detection stage and a non-voltage detection stage (namely a touch detection stage and a display stage).
The driving method specifically includes:
step 61: in the voltage detection phase, the integrated driving circuit 57 may send a control line signal to each switch unit through the control signal line to turn on the connection between the integrated driving circuit 57 and the first touch electrode 51. At this time, the integrated driving circuit 57 provides a detection voltage signal to the first touch electrode 51, and monitors the temperature distribution of the touch display panel according to the voltage of the first touch electrode, thereby determining the compensation value.
Step 62: in the touch detection phase, the integrated drive circuit 57 supplies a control signal to the control signal line, turns off each switch unit, and sends a touch detection signal to the first touch electrode 51. And correcting the received touch induction signal of the second touch electrode 52 according to the compensation value determined in the voltage detection stage, so as to realize the detection of the touch position.
And step 63: in the display stage, the first touch electrode 51 is reused as a common electrode. The integrated driving circuit 57 supplies a control signal to the control signal line to turn off each switching unit, and may supply a common voltage signal to the first touch electrode 51. And the integrated driving circuit 57 also supplies a fixed low-level signal, for example, a ground voltage signal GND, to the second touch electrode 52. The specific operation of each stage can be seen in fig. 7. It is to be understood that the embodiment shown in fig. 7 is merely illustrative and the locations at which the various stages are located in a frame period are not limiting.
It should be noted that the detection of the touch sensing signal of the second touch electrode may be completed by the integrated driving circuit 57, or may be completed by another driving circuit, which is not limited in this embodiment. In addition, the closer to the first touch electrode 51 of the integrated driving circuit 57, the more likely to be affected by the temperature, and the more serious the deformation will be.
It can be understood that the touch display panel in this embodiment may further include some well-known structures, such as a liquid crystal layer disposed between the color film substrate and the array substrate, a spacer for supporting the liquid crystal layer, a protective glass, a backlight, a data line, and a scan line. The liquid crystal layer rotates under the action of an electric field between the pixel electrode and the common electrode, and the display of a picture is realized. Such well-known structures are not shown in fig. 5 in order to avoid unnecessarily obscuring the present application.
Referring further to fig. 7, a timing diagram of the operation of the touch display panel shown in fig. 5 is shown. Wherein, TX1, TX 2. TXN represents the signal transmitted on the first touch control electrode, RX represents the signal transmitted on the second touch control electrode, and SW represents the signal transmitted on the control signal line. Within the display time of one frame of picture, the touch display panel performs display, touch detection and voltage detection under the control of the integrated drive circuit.
Specifically, in the display 1 stage, the integrated drive circuit sends an off signal or a low level signal to the control signal line SW. The respective switch units connected to the control signal line SW are turned off. The first touch electrodes TX1, TX2 · TXN are electrically connected to a common signal line, and receive a common voltage signal. Meanwhile, the second touch electrode RX receives the ground voltage signal GND.
In the touch 1 stage, the integrated driving circuit continues to send a turn-off signal or a low level signal to the control signal line SW. The integrated driving circuit transmits a touch detection signal to a first touch signal line electrically connected to the first touch electrode TX1, and the first touch electrode TX1 receives the touch detection signal. And receives a touch sensing signal generated by the second touch electrode RX. The touch detection signal may be a periodic pulse signal.
The procedure of the display 2 phase is the same as that of the display 1 phase, and is not described herein again.
In the touch 2 stage, the integrated driving circuit continues to send a turn-off signal or a low level signal to the control signal line SW. The integrated driving circuit transmits a touch detection signal to a first touch signal line electrically connected to the first touch electrode TX2, and the first touch electrode TX2 receives the touch detection signal. And receives a touch sensing signal generated by the second touch electrode RX.
In the touch N stage, the integrated driving circuit always sends a turn-off signal or a low level signal to the control signal line SW. The integrated driving circuit sends a touch detection signal to a first touch signal line electrically connected with a first touch electrode TXN, and the first touch electrode TXN receives the touch detection signal. And receives a touch sensing signal generated by the second touch electrode RX.
In the voltage detection stage, the integrated drive circuit sends a turn-on signal or a high-level signal to the control signal line SW. At this time, each of the switching units connected to the control signal line is turned on. The first touch signal lines are multiplexed as data transmission signal lines, and a loop is formed between the integrated drive circuit and each first touch electrode. The integrated driving circuit provides a detection voltage signal U to the first touch electrodes TX1, TX2 · TXN, respectively. Meanwhile, the second touch electrode RX receives the ground voltage signal GND.
Alternatively, the display time in one frame screen may include a plurality of display stages, a plurality of touch detection stages, and a plurality of voltage detection stages. Each touch detection phase may provide a touch detection signal to the plurality of first touch electrodes. For example: when touch 1, pulse signals may be sent to TX1 and TX2 simultaneously. In addition, the voltage detection stage can also be set according to actual needs. Such as: after touch 1, voltage detection is performed first, and then display 2 is performed. It is understood that the same voltage detection phase may also be split into a plurality of sub-periods, each sub-period being disposed at a different position within one frame period. And when voltage detection is carried out, the detection can be respectively carried out on each first touch electrode. As an example, the detection voltage signal may be sent to TX1 or TX1 to TXN/2 first.
As shown in fig. 8, the present application also provides a display device. The display device includes the touch display panel described in the above embodiments. The display device may be various display devices, for example: mobile phones, tablet computers, smart watches, vehicle-mounted display terminals, and the like. As can be seen from fig. 8, icons for some daily functional applications may be included on the display screen 81 of the display device, such as: calculators, cameras, settings, calendars, clocks, gallery and memo etc. When the area where the calendar icon is located is touched with a finger, the display device starts a calendar application on the display screen 81.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (17)
1. A touch display panel is characterized by comprising N first touch electrodes, a plurality of switch units and an integrated drive circuit, wherein N is a positive integer;
each first touch electrode comprises a thermistor part;
one end of the first end and the second end of the first touch electrode is electrically connected with the integrated driving circuit, and the other end of the first end and the second end of the first touch electrode is electrically connected with the integrated driving circuit through a switch unit, wherein the first end is a first side of the first touch electrode in the extending direction, and the second end is a second side of the first touch electrode in the extending direction;
the touch display panel further comprises a control signal line, and the control signal line is used for sending a control signal to the switch unit;
in a voltage detection stage, providing the control signal to the control signal line to close the switch unit, multiplexing the first touch electrode as a thermistor, sending a detection voltage signal to the first touch electrode by the integrated drive circuit, and determining a compensation value according to the voltage of the first touch electrode;
and in the touch detection stage, providing the control signal to the control signal line to disconnect the switch unit, sending a touch detection signal to the first touch electrode, and correcting the touch induction signal according to the compensation value.
2. The touch display panel according to claim 1, wherein the touch display panel includes a plurality of first touch signal lines;
the integrated driving circuit is electrically connected with the first touch electrode through the first touch signal line.
3. The touch display panel according to claim 2, wherein the switch unit comprises a transistor, a gate of the transistor is electrically connected to the control signal line, a first electrode of the transistor is electrically connected to the integrated driving circuit, and a second electrode of the transistor is electrically connected to the first touch electrode.
4. The touch display panel according to claim 2, wherein when the switch unit is closed, the first touch signal line is multiplexed as a data transmission signal line for transmitting the detection voltage signal.
5. The touch display panel according to claim 1, wherein a first end of each of the first touch electrodes is electrically connected to the integrated driving circuit, and a second end of each of the first touch electrodes is electrically connected to the switch unit; or,
the second end of each first touch electrode is electrically connected with the integrated driving circuit, and the first end of each first touch electrode is electrically connected with the switch unit.
6. The touch display panel according to claim 1, wherein first ends of odd-numbered first touch electrodes are electrically connected to the switch unit, and second ends of even-numbered first touch electrodes are electrically connected to the switch unit; or,
the second ends of the odd-numbered first touch electrodes are electrically connected with the switch unit, and the first ends of the even-numbered first touch electrodes are electrically connected with the switch unit.
7. The touch display panel according to claim 1, wherein first ends of the 1 st to ith first touch electrodes are electrically connected to the switch unit, and second ends of the (i + 1) th to nth first touch electrodes are electrically connected to the switch unit; or,
the second ends of the 1 st to ith first touch electrodes are electrically connected with the switch unit, and the first ends of the (i + 1) th to nth first touch electrodes are electrically connected with the switch unit, wherein i is not less than N-1, and i is a positive integer.
8. The touch display panel according to claim 6 or 7, wherein the control signal line includes a first control signal line and a second control signal line;
the first control line signal wire is used for sending a control signal to each switch unit electrically connected with the first end of each first touch electrode;
the second control line signal line is used for sending a control signal to each switch unit electrically connected with the second end of each first touch electrode.
9. The touch display panel according to claim 1, wherein an outer edge of each of the first touch electrodes is provided with the thermistor portion.
10. The touch display panel according to claim 1, wherein each of the first touch electrodes is provided with the thermistor portion on a surface close to or away from the touch display panel, and the distribution pattern of the thermistor portions includes at least one of: straight lines, curved lines, serpentine lines, meshes, and polygons.
11. The touch display panel of claim 1, wherein the thermistor portion comprises at least one of: PTC positive temperature coefficient thermistor, NTC negative temperature coefficient thermistor and CTR critical temperature thermistor.
12. The touch display panel of claim 1, wherein when the switch unit is turned off,
in a touch detection stage, the integrated drive circuit sends a touch detection signal to the first touch electrode;
in the display stage, the first touch electrode is reused as a common electrode, and the integrated drive circuit sends a common voltage signal to the first touch electrode.
13. The touch display panel according to claim 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, or 12, wherein the touch display panel includes a light-shielding layer;
the positive projection area of the thermistor part on the touch display panel is positioned in the positive projection area of the shading layer on the touch display panel.
14. The touch display panel according to claim 8, wherein the touch display panel includes a light-shielding layer;
the positive projection area of the thermistor part on the touch display panel is positioned in the positive projection area of the shading layer on the touch display panel.
15. The touch display panel according to claim 1, wherein the touch display panel comprises an array substrate and a color film substrate arranged opposite to the array substrate;
the first touch electrode is located on the array substrate, a second touch electrode is arranged on the color film substrate, and the extending direction of the first touch electrode is intersected with the extending direction of the second touch electrode.
16. A driving method for driving the touch display panel according to any one of claims 1 to 15, the method comprising:
in a voltage detection stage, providing a control signal to the control signal line to close the switch unit, sending a detection voltage signal to the first touch electrode, and determining a compensation value according to the voltage of the first touch electrode;
in a touch detection stage, providing a control signal to the control signal line to disconnect the switch unit, sending a touch detection signal to the first touch electrode, and correcting a touch induction signal according to the compensation value;
and in a display stage, providing a control signal to the control signal line to disconnect the switch unit and send a common voltage signal to the first touch electrode.
17. A display device comprising the touch display panel according to any one of claims 1 to 15.
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| CN107562296B (en) * | 2017-08-31 | 2020-11-13 | Oppo广东移动通信有限公司 | Array substrate, display panel and electronic equipment |
| CN108132734B (en) * | 2018-01-30 | 2021-05-04 | 业成科技（成都）有限公司 | Touch panel and touch device |
| CN109558040A (en) * | 2018-12-28 | 2019-04-02 | 深圳市德名利电子有限公司 | A kind of self-capacitance touch screen and electronic equipment |
| CN114327128B (en) * | 2021-11-30 | 2023-11-03 | 北京奕斯伟计算技术股份有限公司 | Resistance compensation circuit and touch display device |
| CN115344140A (en) * | 2022-08-10 | 2022-11-15 | 汕头超声显示器技术有限公司 | Capacitive touch screen touch detection method based on addressing |
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