CN107621905B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107621905B CN107621905B CN201710891927.2A CN201710891927A CN107621905B CN 107621905 B CN107621905 B CN 107621905B CN 201710891927 A CN201710891927 A CN 201710891927A CN 107621905 B CN107621905 B CN 107621905B
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a display area and a peripheral circuit area surrounding the display area; the touch control device comprises a plurality of touch control signal lines and a plurality of touch control electrodes positioned in a display area, wherein each touch control electrode is electrically connected with at least one touch control signal line; the touch control device comprises a plurality of pressure sensors positioned in a display area, wherein each pressure sensor comprises a first induction resistor, a second induction resistor, a third induction resistor, a fourth induction resistor, a first signal output end and a second signal output end; the first signal output end of each pressure sensor is electrically connected with a touch signal line through a first switch element, and/or the second signal output end of each pressure sensor is electrically connected with a touch signal line through a first switch element. By the technical scheme, the space occupied by the signal line electrically connected with the pressure sensor in the peripheral circuit area is reduced, and the realization of the narrow frame of the display panel is facilitated.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
At present, a display panel with a touch function is widely used as an information input tool in various electronic devices, such as an information query machine in a hall of a public place, a computer and a mobile phone used by a user in daily life and work. Therefore, the user can operate the electronic equipment by only touching the mark on the touch display screen with fingers, dependence of the user on other input equipment such as a keyboard and a mouse is eliminated, and man-machine interaction is more direct, simple and convenient. In order to better meet the user requirements, a pressure sensor for detecting the touch pressure of a user in the process of touching the touch display screen is usually arranged in the touch display screen, and the pressure sensor can acquire touch position information and also can acquire the size of the touch pressure, so that the application range of the touch display technology is enriched.
Generally include a plurality of pressure sensor among the display panel, every pressure sensor all includes four signal ends, four signal ends correspond four pressure measurement signal line that are located display panel peripheral circuit district promptly, along with the increase of pressure sensor quantity among the display panel, the quantity of the pressure measurement signal line that corresponds with pressure sensor increases at double, has occupied the great space of display panel peripheral circuit district, greatly increased the width of display panel frame, be unfavorable for the realization of the narrow frame of display panel.
Disclosure of Invention
In view of the above, the present invention provides a display panel and a display device, in which a first signal output terminal of each pressure sensor in the display panel is electrically connected to a touch signal line through a first switch element, and/or a second signal output terminal of each pressure sensor is electrically connected to a touch signal line through a first switch element, and the touch signal line in the display panel is multiplexed as a pressure detection signal line electrically connected to the first signal output terminal and/or the second signal output terminal of the pressure sensor, so that a space of a peripheral circuit region of the display panel occupied by the pressure detection signal line electrically connected to the pressure sensor is greatly reduced, and a narrow frame of the display panel is facilitated. In addition, through the arrangement of the first switch element, the display panel can perform display and pressure sensing in a time-sharing mode, and mutual crosstalk between display signals and pressure sensing signals is prevented.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a display area and a peripheral circuit area surrounding the display area;
the touch control device comprises a plurality of touch control signal lines and a plurality of touch control electrodes positioned in the display area, wherein each touch control electrode is electrically connected with at least one touch control signal line;
the touch control signal line comprises a plurality of pressure sensors positioned in the display area, wherein each pressure sensor comprises a first induction resistor, a second induction resistor, a third induction resistor, a fourth induction resistor, a first signal output end and a second signal output end;
the first signal output end of each pressure sensor is electrically connected with one touch signal line through one first switch element, and/or the second signal output end of each pressure sensor is electrically connected with one touch signal line through one first switch element.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
The embodiment of the invention provides a display panel and a display device, wherein a first signal output end of each pressure sensor in the display panel is electrically connected with a touch signal wire through a first switch element, and/or a second signal output end of each pressure sensor is electrically connected with a touch signal wire through a first switch element, and the touch signal wire in the display panel is multiplexed to be used as a pressure detection signal wire electrically connected with the first signal output end and/or the second signal output end of the pressure sensor, so that the problem that the pressure detection signal wire electrically connected with the first signal output end and/or the second signal output end of the pressure sensor is wired by using the circuit area periphery of the display panel to increase the frame width of the display panel is avoided, the pressure sensing function of the pressure sensor can be completed by using the touch signal wire, and the problem that the periphery of the display panel occupied by the pressure detection signal wire electrically connected with the pressure sensor is greatly reduced The space of (2) is favorable for realizing the narrow frame of the display panel. In addition, the first switch element is connected in series between the first signal output end and/or the second signal output end electrically connected with the touch signal line and the corresponding touch signal line, so that the display panel can perform display and pressure sensing in a time-sharing manner, and mutual crosstalk between the display signal and the pressure sensing signal is prevented.
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 top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view along the direction AA' in FIG. 1;
fig. 3 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention;
FIG. 4 is a schematic enlarged view of a portion of the CC region of FIG. 1;
FIG. 5 is a schematic cross-sectional view taken along the direction BB' in FIG. 1;
fig. 6 is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view taken along direction DD' in FIG. 6;
fig. 8 is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view taken along direction EE' of FIG. 8;
fig. 10 is a schematic top view illustrating a display panel according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. Throughout this specification, the same or similar reference numbers refer to the same or similar structures, elements, or processes. 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 embodiment of the invention provides a display panel, which comprises a display area and a peripheral circuit area surrounding the display area, and further comprises a plurality of touch signal lines, a plurality of touch electrodes positioned in the display area, a plurality of pressure sensors positioned in the display area and a plurality of first switch elements, wherein each touch electrode is electrically connected with at least one touch signal line, each pressure sensor comprises a first induction resistor, a second induction resistor, a third induction resistor and a fourth induction resistor, a first signal output end and a second signal output end, the first induction resistor, the second induction resistor, the third induction resistor and the fourth induction resistor of each pressure sensor and the touch signal lines are arranged in the same layer by adopting the same material, the first signal output end of each pressure sensor is electrically connected with one touch signal line through one first switch element, and/or the second signal output end of each pressure sensor is electrically connected with one touch signal line through one first switch element .
Generally include a plurality of pressure sensor among the display panel, with the first signal input part of every pressure sensor, second signal input part, the signal line that first signal output part and second signal output part electricity are connected all needs to utilize the drive chip in the space connection display panel of display panel's peripheral circuit district in order to realize the pressure sensing function, promptly every pressure sensor all corresponds four signal lines that need utilize display panel peripheral circuit district to walk the line, along with the increase of pressure sensor quantity among the display panel, the quantity of the signal line that corresponds with pressure sensor increases at double, the great space of display panel peripheral circuit district has been occupied, greatly increased the width of display panel frame, be unfavorable for the realization of display panel narrow frame.
The embodiment of the invention arranges the first signal output end of each pressure sensor in the display panel to be electrically connected with a touch signal wire through a first switch element, and/or the second signal output end of each pressure sensor to be electrically connected with a touch signal wire through a first switch element, reuses the touch signal wire in the display panel as the pressure detection signal wire electrically connected with the first signal output end and/or the second signal output end of the pressure sensor, avoids the problem that the pressure detection signal wire electrically connected with the first signal output end and/or the second signal output end of the pressure sensor is wired by the peripheral circuit area of the display panel to increase the frame width of the display panel, can complete the pressure sensing function of the pressure sensor by using the touch signal wire, and greatly reduces the space of the peripheral circuit area of the display panel occupied by the pressure detection signal wire electrically connected with the pressure sensor, the realization of the narrow frame of the display panel is facilitated. In addition, the first switch element is connected in series between the first signal output end and/or the second signal output end electrically connected with the touch signal line and the corresponding touch signal line, so that the display panel can perform display and pressure sensing in a time-sharing manner, and mutual crosstalk between the display signal and the pressure sensing signal is prevented.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional view along the direction AA' in fig. 1. Referring to fig. 1 and 2, the display panel includes a display area AA and a peripheral circuit area NAA surrounding the display area AA, the display panel further includes a plurality of touch signal lines 1, a plurality of touch electrodes 2 located in the display area AA, a plurality of pressure sensors 3 located in the display area AA, and a plurality of first switch elements 4, each touch electrode 2 is electrically connected to at least one touch signal line 1, each pressure sensor 3 includes a first sensing resistor R1, a second sensing resistor R2, a third sensing resistor R3, and a fourth sensing resistor R4, and a first signal output terminal c and a second signal output terminal d, the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3, and the fourth sensing resistor R4 of the pressure sensor 3 are disposed in the same layer as the touch signal lines 1, and the first signal output terminal c of each pressure sensor 3 is electrically connected to one touch signal line 1 through a first switch element 4, and/or, the second signal output end d of each pressure sensor 3 is electrically connected with a touch signal line 1 through a first switch element 4.
Specifically, the pressure sensor may be configured such that only the first signal output terminal is electrically connected to a touch signal line through a first switch element, the pressure sensor may be configured such that only the second signal output terminal is electrically connected to a touch signal line through a first switch element, and the first signal output terminal and the second signal output terminal of the pressure sensor may be respectively electrically connected to corresponding touch signal lines through a first switch element. Fig. 1 exemplarily shows two pressure sensors, and a first signal output terminal c and a second signal output terminal d of each pressure sensor 3 are electrically connected to a corresponding touch signal line 1 through a first switch element 4.
Alternatively, the first switch elements may be thin film transistors, as shown in fig. 1, each of the thin film transistors includes a control terminal a1, a first terminal a2, and a second terminal a3, the control terminal a1 of the thin film transistor is electrically connected to the clock signal line 6, the first terminal a2 of the thin film transistor is electrically connected to the corresponding touch signal line 1, and the second terminal a3 of the thin film transistor is electrically connected to the first signal output terminal c or the second signal output terminal d of the corresponding pressure sensor 3. Taking the pressure sensor 31 as an example, the control terminal a1 of the first switch element 41 is electrically connected to a clock signal line 6, the first terminal a2 of the first switch element 41 is electrically connected to the touch signal line 11, and the second terminal a3 of the first switch element 41 is electrically connected to the first signal output terminal c of the pressure sensor 31. The control terminal a1 of the first switch element 42 is electrically connected to the clock signal line 6, the first terminal a2 of the first switch element 42 is electrically connected to the touch signal line 12, and the second terminal a3 of the first switch element 42 is electrically connected to the second signal output terminal d of the pressure sensor 31. The first switching element 4, i.e., the thin film transistor, switches the first signal output terminal c or the second signal output terminal d of the pressure sensor 3 on or off the corresponding touch signal line 1 according to the clock control signal received by the control terminal a 1.
Alternatively, as shown in fig. 1, the display panel may further include a first power signal line 71 and a second power signal line 72 in the peripheral circuit area NAA, each of the pressure sensors 3 further includes a first signal input terminal a and a second signal input terminal b, the first signal input terminals a of all the pressure sensors 3 may be electrically connected to the same first power signal line 71, and the second signal input terminals b of all the pressure sensors 3 may be electrically connected to the same second power signal line 72, so that the control of all the pressure sensors 3 in the display panel is realized only by two signal lines of the first power signal line 71 and the second power signal line 72, that is, the supply of the bias voltage for pressure detection to all the pressure sensors 3 in the display panel is realized by two signal lines of the first power signal line 71 and the second power signal line 72.
Optionally, in the touch position detecting stage, the thin film transistor disconnects the first signal output end c or the second signal output end d of the pressure sensor 3 from the corresponding touch signal line 1 according to the clock control signal received by the control end a 1. In the pressure detection stage, the thin film transistor connects the first signal output terminal c or the second signal output terminal d of the pressure sensor 3 to the corresponding touch signal line 1 according to the clock control signal received by the control terminal a 1.
Specifically, referring to fig. 1, taking the pressure sensor 31 as an example, in the touch position detecting stage, the first switch element 41 controls the first terminal a2 and the second terminal a3 of the first switch element 41 to be disconnected according to the clock control signal received by the control terminal a1 of the first switch element 41, the first switch element 42 controls the first terminal a2 and the second terminal a3 of the first switch element 42 to be disconnected according to the clock control signal received by the control terminal a1 of the first switch element 42, so that the first signal output terminal c of the pressure sensor 31 is disconnected from the touch signal line 11, and the second signal output terminal d of the pressure sensor 31 is disconnected from the touch signal line 12. At this time, a touch signal may be input to the touch electrode 2 electrically connected to the touch signal line 1 through each touch signal line 1, and the touch position may be detected by detecting a capacitance value fed back to the touch electrode 2. Since both the first switch element 41 and the first switch element 42 are in the off state at this time, the touch signal line 11 is effectively prevented from being short-circuited with the touch signal line 12 through the pressure sensor 31.
In the pressure detection phase, the first switch element 41 controls the first terminal a2 and the second terminal a3 of the first switch element 41 to conduct according to the clock control signal received by the control terminal a1, the first switch element 42 controls the first terminal a2 and the second terminal a3 of the first switch element 42 to conduct according to the clock control signal received by the control terminal a1, so that the first signal output terminal c of the pressure sensor 31 is conducted with the touch signal line 11, and the second signal output terminal d of the pressure sensor 31 is conducted with the touch signal line 12. At this time, each touch signal line 1 is controlled not to input a touch signal to the touch electrode 2 electrically connected to the touch signal line 1, but to input a bias voltage to the first signal input terminal a and the second signal input terminal b of the pressure sensor 31 through the first power signal line 71 and the second power signal line 72, respectively, and when the touch subject presses the display panel, the first signal output terminal c and the second signal output terminal d of the pressure sensor 31 output a pressure sensing signal through the touch signal line 11 and the touch signal line 12, respectively, and the pressure of the touch subject pressing the display panel is detected based on the pressure sensing signal.
In this way, while multiplexing the touch signal line as the pressure detection signal line electrically connected to the first signal output terminal and/or the second signal output terminal of the pressure sensor reduces the space of the peripheral circuit region of the display panel occupied by the signal line electrically connected to the pressure sensor, by connecting the first switching element in series between the first signal output terminal and/or the second signal output terminal electrically connected to the touch signal line and the corresponding touch signal line, the display panel can perform display and pressure sensing in a time-sharing manner, preventing crosstalk between the display signal and the pressure sensing signal. In addition, in the prior art, four signal ends of each pressure sensor are respectively electrically connected with four pins of the driving chip, in the embodiment of the invention, the touch signal line is multiplexed to serve as the pressure detection signal line electrically connected with the first signal output end and/or the second signal output end of the pressure sensor, that is, the pin electrically connected with the touch signal line on the driving chip is multiplexed to serve as the pin electrically connected with the first signal output end or the second signal output end of the pressure sensor, so that the number of the pins of the driving chip is reduced for the same number of pressure sensors.
Fig. 3 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention. As shown in fig. 3, taking the pressure sensor 31 as an example, when the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 satisfy the bridge balance condition
When the voltage of the first signal output end c is equal to that of the second signal output end d, the pressure detection signal is zero. When the touch main body presses the display panel, the first to fourth induction resistors deform and do not meet the bridge balance condition
The pressure can be detected according to the pressure sensing detection signals output by the first signal output end c and the second signal output end d. The pressure sensor is arranged in the shape shown in fig. 3, that is, the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 are all arranged in a serpentine shape, so that the first sensing resistor R3578 can be arranged in a serpentine shapeThe R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 have synchronous temperature change, and the influence of temperature difference on pressure detection is eliminated.
Alternatively, as shown in fig. 1, the control terminals a1 of all the thin film transistors may be electrically connected to the same clock signal line 6, that is, the control terminals a1 of all the first switching elements 4 may be electrically connected to the same clock signal line 6. When the touch position is detected, all the first switch elements 4 can be controlled to be turned off at the same time through the clock signal line 6, and when the pressure is detected, all the first switch elements 4 can be controlled to be turned on at the same time through the clock signal line 6, so that the number of clock signal lines electrically connected with the control end a1 of the first switch element 4 is reduced while the touch position and pressure detection of the display panel is not influenced.
Alternatively, as shown in fig. 1, the peripheral circuit area NAA where the first power signal line 71 is located and the peripheral circuit area NAA where the second power signal line 72 is located may be respectively located at two ends of the touch signal line 1, and the widths of the upper and lower frames of the display panel may be reduced to the greatest extent compared to the case where the peripheral circuit area NAA where the first power signal line 71 is located and the peripheral circuit area NAA where the second power signal line 72 is located are located at one end of the touch signal line 1.
Optionally, as shown in fig. 1, the touch electrode 2 may be a self-capacitance touch electrode block, a plurality of self-capacitance touch electrode blocks are arranged in a matrix, and a plurality of touch signal lines 1 are located in the display area AA. Specifically, capacitors are formed between the capacitive touch electrode blocks and the ground, and the touch position is determined by detecting capacitance values fed back from the capacitive touch electrode blocks.
Optionally, the first sensing resistor, the second sensing resistor, the third sensing resistor and the fourth sensing resistor of each pressure sensor may be located between two adjacent touch signal lines. Fig. 4 is a partially enlarged schematic view of the CC area in fig. 1, and referring to fig. 1 and 4, taking the pressure sensor 31 as an example, a first sensing resistor R1, a second sensing resistor R2, a third sensing resistor R3 and a fourth sensing resistor R4 of the pressure sensor 31 may be disposed between the touch signal line 11 and the touch signal line 12, since the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 of the pressure sensor 31 are disposed in the same layer as the touch signal line 1 by using the same material, the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 of the pressure sensor 3 are disposed between two adjacent touch signal lines 1, so that the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 formed by winding may not overlap with the touch signal line 1, the resistance windings of the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 are prevented from being shorted with the touch signal line 1.
Optionally, the first signal output end is electrically connected to the corresponding first switch element through a first conductive lead, or the second signal output end is electrically connected to the corresponding first switch element through a first conductive lead, or the first signal output end and the second signal output end are electrically connected to the corresponding first switch element through a first conductive lead, respectively, and the first conductive lead and the touch signal line may be made of the same material and disposed on the same layer. Fig. 1 exemplarily shows that the first signal output terminal c and the second signal output terminal d are electrically connected to the corresponding first switch element 4 through a first conductive lead 5, fig. 5 is a schematic cross-sectional structure along the direction BB' of fig. 1, and with reference to fig. 1 and 5, taking the pressure sensor 32 as an example, the first signal output terminal c of the pressure sensor 32 is electrically connected to the first switch element 43 through a first conductive lead 53, and the second signal output terminal d of the pressure sensor 32 is electrically connected to the first switch element 44 through a first conductive lead 54, so that the first conductive lead 53 and the first conductive lead 54 can be made of the same material and disposed in the same layer as the touch signal line, thereby simplifying the manufacturing process of the display panel.
Optionally, the first signal input end of each pressure sensor is electrically connected to the first power signal line through a second conductive lead, the second signal input end of each pressure sensor is electrically connected to the second power signal line through a third conductive lead, and the second conductive lead, the third conductive lead and the touch signal line are disposed in the same layer using the same material. Referring to fig. 1 and 5, taking the pressure sensor 32 as an example, the first signal input terminal a of the pressure sensor 32 is electrically connected to the first power signal line 71 through a second conductive lead 91, and the second signal input terminal b of the pressure sensor 32 is electrically connected to the second power signal line 72 through a third conductive lead 92, so that the second conductive lead 91 and the third conductive lead 92 and the touch signal line can be disposed in the same layer using the same material, and the manufacturing process of the display panel can be simplified.
Optionally, as shown in fig. 1, a plurality of first switch elements 4 may be disposed in the peripheral circuit area NAA of the display panel, so as to prevent the first switch elements 4 from being disposed in the display area AA of the display panel and affecting the light transmittance of the display panel, the first conductive lead 5 may include at least a lead segment 10 that is perpendicular to the touch signal line 1 and located in the peripheral circuit area NAA, all the lead segments 10 are all located on the same straight line, that is, the first signal output end c of the pressure sensor 31 is electrically connected to the first switch element 41 through a first conductive lead 51, and the first conductive lead 51 includes a lead segment 101 that is perpendicular to the touch signal line 11 and located in the peripheral circuit area NAA; the second signal output end d of the pressure sensor 31 is electrically connected to the first switch element 42 through a first conductive lead 52, the first conductive lead 52 includes a lead segment 102 located in the peripheral circuit area NAA and perpendicular to the touch signal line 12; the first signal output end c of the pressure sensor 32 is electrically connected to the first switch element 43 through a first conductive lead 53, the first conductive lead 53 includes a conductive line segment 103 located in the peripheral circuit area NAA and perpendicular to the touch signal line 13; the second signal output end d of the pressure sensor 32 is electrically connected to the first switch element 44 through a first conductive lead 54, the first conductive lead 54 includes a conductive segment 104 located in the peripheral circuit area NAA and perpendicular to the touch signal line 14, and the conductive segments 101 to 104 can be arranged on the same straight line, and are not located on the same straight line relative to the conductive segments 101 to 104, so that the width of the upper frame of the display panel is reduced, and the display panel can realize a narrow frame.
Fig. 6 is a schematic top view of another display panel according to an embodiment of the present invention. As shown in fig. 6, different from fig. 1, the touch structure is a mutual capacitance type touch structure, the display panel includes a plurality of touch driving signal lines 15 and a plurality of touch sensing signal lines 16, and a plurality of mutual capacitance type touch driving electrodes 21 and a plurality of mutual capacitance type touch sensing electrodes 22, each touch driving signal line 15 is electrically connected to a mutual capacitance type touch driving electrode 21, each touch sensing signal line 16 is electrically connected to a mutual capacitance type touch sensing electrode 22, the mutual capacitance type touch driving electrodes 21 and the mutual capacitance type touch sensing electrodes 22 are arranged in an insulated and crossed manner, and the plurality of touch driving signal lines 15 and the plurality of touch sensing signal lines 16 are located at the periphery NAA of the circuit region. Specifically, the mutual capacitance type touch driving electrodes 21 and the mutual capacitance type touch sensing electrodes 22 form a capacitor, a touch driving signal is sequentially input to the mutual capacitance type touch driving electrodes 21, and the mutual capacitance type touch sensing electrodes 22 simultaneously output a touch detection signal, so that the capacitance value of the intersection point of all the mutual capacitance type touch driving electrodes 21 and the mutual capacitance type touch sensing electrodes 22, that is, the capacitance value of the whole two-dimensional plane, can be obtained, and the coordinates of the touch point are calculated according to the capacitance variation data of the two-dimensional plane.
Specifically, the touch signal line is a mutual capacitance type touch driving signal line, or the touch signal line is a mutual capacitance type touch sensing signal line, that is, the first to fourth sensing resistors of the pressure sensor and the mutual capacitance type touch driving signal line are arranged in the same layer by using the same material, and the first signal output end of the pressure sensor is electrically connected with the mutual capacitance type touch driving signal line through a first switch element, and/or the second signal output end of the pressure sensor is electrically connected with the mutual capacitance type touch driving signal line through a first switch element. Or the first to fourth induction resistors of the pressure sensor and the mutual capacitance type touch control sensing signal line are arranged in the same layer by adopting the same material, and the first signal output end of the pressure sensor is electrically connected with the mutual capacitance type touch control sensing signal line through a first switch element, and/or the second signal output end of the pressure sensor is electrically connected with the mutual capacitance type touch control sensing signal line through a first switch element. Fig. 6 exemplarily sets the touch signal line as the touch driving signal line 15, and the first signal output terminal c and the second signal output terminal d of the pressure sensor 3 are electrically connected to a touch driving signal line 15 through a first switch element 4.
As shown in fig. 6, in addition to the structure of fig. 1, in which the touch structure is replaced by a capacitive touch structure, the display panel further includes a plurality of second switch elements 8, the first switch elements 4 are electrically connected to the corresponding touch signal lines 15 at first nodes 17, and the touch electrodes 2 are electrically connected to the first nodes 17 through a second switch element 8. Taking the pressure sensor 31 as an example, the first signal output terminal c of the pressure sensor 31 is electrically connected to the touch driving signal line 151 through the first switch element 41, the first switch element 41 is electrically connected to the touch driving signal line 151 at the first node 17, and the mutual capacitance type touch driving electrode 211 is electrically connected to the first node 17 through a second switch element 81. The second signal output terminal d of the pressure sensor 31 is electrically connected to the touch driving signal line 152 through the first switch element 42, the first switch element 42 is electrically connected to the touch driving signal line 152 at the first node 17, and the mutual capacitance touch driving electrode 212 is electrically connected to the first node 17 through a second switch element 82.
Optionally, the first switch element is a P-type thin film transistor, the second switch element is an N-type thin film transistor, or the first switch element is an N-type thin film transistor, the second switch element is a P-type thin film transistor, and the control ends of all the first switch elements and the control ends of all the second switch elements are electrically connected to the same clock signal line. As shown in fig. 6, it is exemplary to provide the first switching elements 4 as N-type thin film transistors, the second switching elements 8 as P-type thin film transistors, and the control terminals a1 of all the first switching elements 4 and the control terminals a1 of all the second switching elements 8 are electrically connected to the same clock signal line 6 to reduce the number of clock signal lines electrically connected to the control terminals a1 of the first switching elements 4 and the second switching elements 8.
Specifically, in the touch detection stage, the clock signal line 6 may be controlled to be supplied with a low-level clock control signal, the first switch element 41 and the first switch element 42 are turned off under the action of the low-level clock control signal, the second switch element 81 and the second switch element 82 are turned on under the action of the low-level clock control signal, the touch driving signal is input to the mutual capacitance type touch driving electrode 21 electrically connected to the touch driving signal line 15 through each touch driving signal line 15, when the touch main body presses the display panel, the mutual capacitance type touch sensing electrode 22 outputs a sensing signal through the touch sensing signal line 16, and the touch position is detected according to the output sensing signal. At this time, the first switch element 41 and the first switch element 42 are both in an off state, so that the touch driving signal line 151 is effectively prevented from being short-circuited with the touch driving signal line 152 through the pressure sensor 31.
In the pressure detection stage, the clock signal line 6 can be controlled to be supplied with a high-level clock control signal, the first switch element 41 and the first switch element 42 are turned on by the high-level clock control signal, the second switch element 81 and the second switch element 82 are turned off by the high-level clock control signal, each touch driving signal line 15 is controlled not to input a touch driving signal to the mutual capacitance type touch driving electrode 21 electrically connected to the touch driving signal line 15, but to input a bias voltage to the first signal input terminal a and the second signal input terminal b of the pressure sensor 31 through the first power signal line 71 and the second power signal line 72, respectively, and when the touch subject presses the display panel, the first signal output terminal c and the second signal output terminal d of the pressure sensor 31 output a pressure sensing signal through the touch driving signal line 151 and the touch driving signal line 152, respectively, and detecting the pressure of the touch body pressing the display panel according to the pressure sensing signal. In this way, the display panel can perform display and pressure sensing in a time-sharing manner by the arrangement of the first switching element 4 and the second switching element 8, and mutual crosstalk between the display signal and the pressure sensing signal is prevented.
Optionally, the first switch element is electrically connected to the corresponding second switch element through a first conductive lead, and the first conductive lead and the touch signal line may be disposed in the same layer using the same material. Fig. 7 is a schematic cross-sectional structure view along the direction DD' in fig. 6, and referring to fig. 6 and 7, taking the pressure sensor 32 as an example, the first switch element 43 is electrically connected to the second switch element 83 through a first conductive lead 53, the first switch element 44 is electrically connected to the second switch element 84 through a first conductive lead 54, and when the touch signal line is the touch driving signal line 15, the first conductive lead 53, the first conductive lead 54 and the touch driving signal line 15 may be formed by using the same material and the same layer, so as to simplify the manufacturing process of the display panel.
Optionally, with reference to fig. 6 and fig. 7, taking the pressure sensor 32 as an example, the first signal input end a of the pressure sensor 32 is electrically connected to the first power signal line 71 through a second conductive lead 91, and the second signal input end b of the pressure sensor 32 is electrically connected to the second power signal line 72 through a third conductive lead 92, so that the second conductive lead 91, the third conductive lead 92 and the touch driving signal line 15 can be disposed in the same layer using the same material, and the manufacturing process of the display panel can be simplified.
Optionally, as shown in fig. 6, a plurality of first switch elements 4 and a plurality of second switch elements 8 may be disposed in the peripheral circuit area NAA of the display panel, so as to prevent the first switch elements 4 and the second switch elements 8 from being disposed in the display area AA of the display panel to affect the light transmittance of the display panel, which is similar to the structure shown in fig. 1, the first conductive lead 5 at least includes a lead segment that is disposed in the peripheral circuit area NAA and perpendicular to the touch driving signal line 15, and all the lead segments may be disposed on the same straight line, so as to reduce the width of the upper frame of the display panel, and facilitate the display panel to implement a narrow frame.
Fig. 8 is a schematic top view of another display panel according to an embodiment of the present invention. As shown in fig. 8, different from fig. 6, the display panel only includes the first switch element 4, and exemplarily, the touch signal line is set as the touch driving signal line 15, that is, the first to fourth sensing resistors of the pressure sensor 3 and the touch driving signal line are disposed in the same layer using the same material, and the first signal output terminal c and the second signal output terminal d of the pressure sensor 3 are both electrically connected to a touch driving signal line 15 through a first switch element 4.
For example, the control terminals a1 of the first switching elements 4 may be all electrically connected to the same clock signal line 6. Specifically, in the touch position detection stage, the first switch element 4 is controlled to be turned off, and in the pressure detection stage, the first switch element 4 is controlled to be turned on, so that the display panel can perform display and pressure sensing in a time-sharing manner through the arrangement of the first switch element 4, and the specific working principle is similar to the structure shown in fig. 1 and 6 and is not repeated here.
Optionally, the first switch element is electrically connected to the corresponding touch signal line through a first conductive lead, and the first conductive lead and the touch signal line may be disposed in the same layer using the same material. Fig. 9 is a schematic cross-sectional structure view along EE' direction in fig. 8, and referring to fig. 8 and 9, taking the pressure sensor 32 as an example, the first switch element 43 corresponding to the first signal output end c of the pressure sensor 32 is electrically connected to the touch driving signal line 153 through a first conductive lead 53, the first switch element 44 corresponding to the second signal output end d of the pressure sensor 32 is electrically connected to the touch driving signal line 154 through a first conductive lead 54, and when the touch driving signal line is the touch driving signal line 15, the first conductive lead 53, the first conductive lead 54 and the touch driving signal line 15 may be made of the same material in the same layer.
Optionally, with reference to fig. 8 and fig. 9, taking the pressure sensor 32 as an example, the first signal input end a of the pressure sensor 32 is electrically connected to the first power signal line 71 through a second conductive lead 91, and the second signal input end b of the pressure sensor 32 is electrically connected to the second power signal line 72 through a third conductive lead 92, so that the second conductive lead 91, the third conductive lead 92 and the touch driving signal line 15 can be disposed in the same layer using the same material, and the manufacturing process of the display panel can be simplified.
Optionally, as shown in fig. 8, a plurality of first switch elements 4 may be disposed in the peripheral circuit area NAA of the display panel, so as to prevent the first switch elements 4 from being disposed in the display area AA of the display panel to affect the light transmittance of the display panel, and similar to the structure shown in fig. 1, the first conductive lead 5 at least includes a lead segment located in the peripheral circuit area NAA and perpendicular to the touch driving signal line 15, and all the lead segments may be disposed on the same straight line, so as to reduce the width of the upper frame of the display panel, and facilitate the display panel to implement a narrow frame.
It should be noted that the cross-sectional structure corresponding to fig. 5 only shows a part of the structure corresponding to fig. 1, and a part of the film layer structure of the display area of the display panel is not shown, and those skilled in the art can understand that the display area of the display panel further includes film layer structures such as an active layer, a gate layer, and a source drain layer, in addition to the structure shown in fig. 5. Similarly, the cross-sectional structure of fig. 7 only shows a portion of the structure corresponding to fig. 6, and does not show a portion of the film layer structure of the display area of the display panel, and the cross-sectional structure of fig. 9 only shows a portion of the structure corresponding to fig. 8, and does not show a portion of the film layer structure of the display area of the display panel.
Optionally, fig. 10 is a schematic top view structure diagram of a display panel according to an embodiment of the present invention. As shown in fig. 10, the display panel may further include a black matrix 73 (only a part of the black matrix is exemplarily shown in fig. 10) and a plurality of pixel units 74 arranged in a matrix, the pixel units 74 are located in a space 741 surrounded by the black matrix 73, the black matrix 73 covers signal lines, such as gate lines and data lines, etc. (not shown in fig. 10) electrically connected to the pixel units 74, and the black matrix 73 corresponds to a non-light-transmitting area of the display panel. Fig. 10 exemplarily shows a pressure sensor, the pressure sensor includes a first sensing resistor R1, a second sensing resistor R2, a third sensing resistor R3, and a fourth sensing resistor R4, and the first to fourth sensing resistors are arranged in a serpentine shape, and a black matrix 73 can be disposed to cover the pressure sensor, that is, the black matrix 74 is disposed to cover the first to fourth sensing resistors of the pressure sensor, and the other pressure sensors in the display panel are disposed in a similar manner, which is not repeated herein, so as to effectively avoid the pressure sensor from affecting the light transmittance of the display panel.
It should be noted that the drawings of the embodiments of the present invention only show the sizes of the elements by way of example, and do not represent the actual sizes of the elements in the display panel.
The embodiment of the invention arranges the first signal output end of each pressure sensor in the display panel to be electrically connected with a touch signal wire through a first switch element, and/or the second signal output end of each pressure sensor to be electrically connected with a touch signal wire through a first switch element, reuses the touch signal wire in the display panel as the pressure detection signal wire electrically connected with the first signal output end and/or the second signal output end of the pressure sensor, avoids the problem that the pressure detection signal wire electrically connected with the first signal output end and/or the second signal output end of the pressure sensor is wired by the peripheral circuit area of the display panel to increase the frame width of the display panel, can complete the pressure sensing function of the pressure sensor by using the touch signal wire, and greatly reduces the space of the peripheral circuit area of the display panel occupied by the pressure detection signal wire electrically connected with the pressure sensor, the realization of the narrow frame of the display panel is facilitated. In addition, the first switch element is connected in series between the first signal output end and/or the second signal output end electrically connected with the touch signal line and the corresponding touch signal line, so that the display panel can perform display and pressure sensing in a time-sharing manner, and mutual crosstalk between the display signal and the pressure sensing signal is prevented.
The embodiment of the invention also provides a display device, and fig. 11 is a schematic structural diagram of the display device provided by the embodiment of the invention. As shown in fig. 11, the display device 28 includes the display panel 27 in the above embodiment, so that the display device 28 provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not repeated herein. The display device 28 may be an organic light emitting display device or a liquid crystal display device, for example. Illustratively, the display device may be an electronic display device such as a mobile phone, a computer, or a television.
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 illustrated herein, but is capable of various obvious changes, rearrangements 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 (17)
1. A display panel, comprising:
a display area and a peripheral circuit area surrounding the display area;
the touch control device comprises a plurality of touch control signal lines and a plurality of touch control electrodes positioned in the display area, wherein each touch control electrode is electrically connected with at least one touch control signal line;
the touch control signal line comprises a plurality of pressure sensors positioned in the display area, wherein each pressure sensor comprises a first induction resistor, a second induction resistor, a third induction resistor, a fourth induction resistor, a first signal output end and a second signal output end;
a plurality of first switch elements, wherein a first signal output terminal of each of the pressure sensors is electrically connected to a touch signal line through one of the first switch elements, and/or a second signal output terminal of each of the pressure sensors is electrically connected to a touch signal line through one of the first switch elements; the first switching elements are thin film transistors, and each thin film transistor comprises a control end, a first end and a second end; the control end of the thin film transistor is connected with a clock signal line, the first end of the thin film transistor is electrically connected with the corresponding touch signal line, and the second end of the thin film transistor is electrically connected with the corresponding first signal output end or second signal output end of the pressure sensor; the thin film transistor is used for connecting or disconnecting the first signal output end or the second signal output end of the pressure sensor with the corresponding touch signal line according to the clock control signal received by the control end.
2. The display panel according to claim 1, wherein the control terminals of all the thin film transistors are electrically connected to the same clock signal line.
3. The display panel according to claim 2,
in the touch position detection stage, the thin film transistor disconnects the first signal output end or the second signal output end of the pressure sensor from the corresponding touch signal line according to the clock control signal received by the control end;
in the pressure detection stage, the thin film transistor conducts the first signal output end or the second signal output end of the pressure sensor with the corresponding touch signal line according to the clock control signal received by the control end.
4. The display panel according to claim 1, further comprising:
a first power signal line and a second power signal line in the peripheral circuit region;
each of said pressure sensors further comprising a first signal input and a second signal input;
the first signal input ends of all the pressure sensors are electrically connected with the same first power signal wire; the second signal input terminals of all the pressure sensors are electrically connected to the same second power signal line.
5. The display panel according to claim 4,
the peripheral circuit region where the first power signal line is located and the peripheral circuit region where the second power signal line is located are located at two ends of the touch signal line respectively.
6. The display panel according to claim 4, wherein the first signal input terminal of each of the pressure sensors is electrically connected to the first power signal line through a second electrically conductive lead;
a second signal input terminal of each of the pressure sensors is electrically connected to the second power signal line through a third electrically conductive lead;
the second conductive lead, the third conductive lead and the touch signal line are arranged in the same layer by adopting the same material.
7. The display panel according to claim 1, wherein the touch electrodes are self-capacitance touch electrode blocks, and a plurality of the self-capacitance touch electrode blocks are arranged in a matrix; the touch signal lines are located in the display area.
8. The display panel according to claim 7, wherein the first sensing resistor, the second sensing resistor, the third sensing resistor, and the fourth sensing resistor of each of the pressure sensors are located between two adjacent touch signal lines.
9. The display panel according to claim 7, wherein the first signal output terminal is electrically connected to the corresponding first switching element through a first conductive lead; or, the second signal output end is electrically connected with the corresponding first switch element through a first conductive lead; or, the first signal output end and the second signal output end are electrically connected with the corresponding first switch element through a first conductive lead respectively; the first conductive lead and the touch signal line are made of the same material and are arranged on the same layer.
10. The display panel according to claim 1, comprising:
the touch control device comprises a plurality of touch control driving signal lines, a plurality of touch control sensing signal lines, a plurality of mutual capacitance type touch control driving electrodes and a plurality of mutual capacitance type touch control sensing electrodes, wherein each touch control driving signal line is electrically connected with one mutual capacitance type touch control driving electrode; the touch driving signal lines and the touch sensing signal lines are positioned in the peripheral circuit area;
the touch signal line is the touch driving signal line; or the touch signal line is the touch sensing signal line.
11. The display panel according to claim 10, further comprising:
a plurality of second switching elements; the first switch element is electrically connected with the corresponding touch signal line at a first node, and the touch electrode is electrically connected with the first node through the second switch element.
12. The display panel according to claim 11, wherein the first switching element is a P-type thin film transistor, and the second switching element is an N-type thin film transistor; or the first switch element is an N-type thin film transistor, and the second switch element is a P-type thin film transistor;
the control terminals of all the first switching elements and the control terminals of all the second switching elements are electrically connected to the same clock signal line.
13. The display panel according to claim 11, wherein the first switching element is electrically connected to the corresponding second switching element through a first conductive lead; the first conductive lead and the touch signal line are arranged in the same layer by adopting the same material.
14. The display panel according to claim 10, wherein the first switch element is electrically connected to the corresponding touch signal line through a first conductive lead; the first conductive lead and the touch signal line are arranged in the same layer by adopting the same material.
15. The display panel according to any one of claims 9, 13, and 14, wherein the plurality of first switching elements are located in the peripheral circuit region;
the first conductive lead at least comprises lead sections which are positioned in the peripheral circuit area and perpendicular to the touch signal line, and all the lead sections are positioned on the same straight line.
16. The display panel according to claim 1, further comprising:
a black matrix;
the first sensing resistor, the second sensing resistor, the third sensing resistor and the fourth sensing resistor of each pressure sensor are arranged in a snake shape;
the black matrix covers each of the plurality of pressure sensors.
17. A display device characterized by comprising the display panel according to any one of claims 1 to 16.
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| CN201710891927.2A CN107621905B (en) | 2017-09-27 | 2017-09-27 | Display panel and display device |
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| CN108648695B (en) * | 2018-05-14 | 2021-06-11 | 昆山国显光电有限公司 | Display panel, touch display panel and touch display device |
| CN108762549B (en) * | 2018-05-14 | 2020-10-23 | 昆山国显光电有限公司 | Display panel, touch display screen and touch display equipment |
| CN112651264A (en) * | 2019-10-10 | 2021-04-13 | 群创光电股份有限公司 | Electronic device |
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| US9696576B2 (en) * | 2012-09-18 | 2017-07-04 | Touchplus Information Corp. | Pen writing on one-dimensional capacitive touch sensor |
| CN106325579B (en) * | 2015-07-10 | 2023-04-07 | 宸鸿科技(厦门)有限公司 | Pressure sensing input device |
| CN105528120B (en) * | 2016-03-04 | 2018-09-14 | 京东方科技集团股份有限公司 | Display base plate and its driving method, display device |
| CN106125987B (en) * | 2016-07-04 | 2019-06-11 | 厦门天马微电子有限公司 | Touch-control display panel and its driving method, touch control display apparatus |
| CN106201099B (en) * | 2016-07-20 | 2019-02-19 | 上海天马微电子有限公司 | A kind of pressure sensitive touch screen and display device |
| CN106020563A (en) * | 2016-08-09 | 2016-10-12 | 上海天马微电子有限公司 | Display panel and display device |
| CN106527791B (en) * | 2016-11-01 | 2019-06-25 | 上海天马微电子有限公司 | The display device and driving method that display panel, integrated pressure incude |
| CN106648236B (en) * | 2016-12-20 | 2020-07-31 | 上海天马微电子有限公司 | Touch display panel and touch display device |
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