CN107526469B - Pressure sensor, control method thereof, display panel and display device - Google Patents
Pressure sensor, control method thereof, display panel and display device Download PDFInfo
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- CN107526469B CN107526469B CN201710730392.0A CN201710730392A CN107526469B CN 107526469 B CN107526469 B CN 107526469B CN 201710730392 A CN201710730392 A CN 201710730392A CN 107526469 B CN107526469 B CN 107526469B
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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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
- G06F3/0412—Digitisers structurally integrated in a display
Abstract
The invention discloses a pressure sensor and a control method thereof, a display panel and a display device, wherein the pressure sensor comprises a first power signal input end, a second power signal input end, a first detection signal output end, a second detection signal output end, a first thin film transistor, a second thin film transistor, a third thin film transistor and a fourth thin film transistor; the first thin film transistor is connected in series between the first power signal input end and the first detection signal output end, the second thin film transistor is connected in series between the first detection signal output end and the second power signal input end, the third thin film transistor is connected in series between the second power signal input end and the second detection signal output end, and the fourth thin film transistor is connected in series between the second detection signal output end and the first power signal input end. By the technical scheme of the invention, when the pressure sensor does not need to work, the power consumption of the pressure sensor is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pressure sensor, a control method of the pressure sensor, 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. In addition to display screens, pressure sensors are also widely used in other devices requiring pressure sensing. The power consumption of the pressure sensor is an important technical index for measuring the performance of the pressure sensor, and how to reduce the power consumption of the pressure sensor is an important technical problem in the industry.
Disclosure of Invention
In view of this, the present invention provides a pressure sensor, a control method thereof, a display panel and a display device, in which a thin film transistor is used to replace an inductive resistor in the pressure sensor, and when the pressure sensor is not required to perform pressure detection, a control signal input by a control terminal of the thin film transistor can control the thin film transistor to turn off, so as to control the pressure sensor to be in a non-operating state, thereby reducing static power consumption of the pressure sensor.
In a first aspect, an embodiment of the present invention provides a pressure sensor, including:
a first power signal input terminal, a second power signal input terminal, a first detection signal output terminal, a second detection signal output terminal, and a first thin film transistor, a second thin film transistor, a third thin film transistor, and a fourth thin film transistor;
the first thin film transistor is connected in series between the first power signal input end and the first detection signal output end, the second thin film transistor is connected in series between the first detection signal output end and the second power signal input end, the third thin film transistor is connected in series between the second power signal input end and the second detection signal output end, and the fourth thin film transistor is connected in series between the second detection signal output end and the first power signal input end.
In a second aspect, an embodiment of the present invention further provides a display panel, including the pressure sensor according to the first aspect.
In a third aspect, an embodiment of the present invention further provides a display device, including the display panel according to the second aspect.
In a fourth aspect, an embodiment of the present invention further provides a method for controlling the pressure sensor in the first aspect, where the method includes:
a pressure sensing detection stage and a pressure sensing clearance stage; wherein the content of the first and second substances,
in the pressure sensing detection stage, controlling the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor to be conducted;
inputting a first power supply signal through the first power supply signal input end, and inputting a second power supply signal through the second power supply signal input end;
detecting the pressure of the touch body pressing the pressure sensor through a first detection signal output by the first detection signal output end and a second detection signal output by the second detection signal output end;
and controlling the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor to be turned off in the pressure-sensitive gap stage.
The embodiment of the invention provides a pressure sensor, a control method thereof, a display panel and a display device, wherein a thin film transistor is used for replacing an induction resistor in the conventional pressure sensor, and when the pressure sensor is not required to detect pressure, the thin film transistor can be controlled to be turned off by a control signal input by a control end of the thin film transistor, so that the pressure sensor is controlled to be in a non-working state, and the static power consumption of the pressure sensor is reduced.
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 circuit diagram of a pressure sensor according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a first thin film transistor in a pressure sensor according to an embodiment of the present invention;
fig. 3a is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 3b is a schematic top view of another display panel according to an embodiment of the present invention;
fig. 4 is a partially enlarged schematic view of a pressure sensor in a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic enlarged view of a portion of a pressure sensor in another display panel according to an embodiment of the invention;
FIG. 6a is a schematic enlarged partial view of a pressure sensor in another display panel according to an embodiment of the invention;
FIG. 6b is a schematic enlarged view of a portion of a pressure sensor in another display panel according to an embodiment of the invention;
fig. 7 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the invention;
fig. 8a is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 8b is a schematic cross-sectional view along AA' of FIG. 8 a;
fig. 9a is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 9b is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating a control method of a pressure sensor 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 pressure sensor which comprises a first power supply signal input end, a second power supply signal input end, a first detection signal output end, a second detection signal output end, a first thin film transistor, a second thin film transistor, a third thin film transistor and a fourth thin film transistor. The first thin film transistor is connected in series between the first power signal input end and the first detection signal output end, the second thin film transistor is connected in series between the first detection signal output end and the second power signal input end, the third thin film transistor is connected in series between the second power signal input end and the second detection signal output end, and the fourth thin film transistor is connected in series between the second detection signal output end and the first power signal input end.
At present, wheatstone bridge type pressure sensor generally includes four sensing resistor, four sensing resistor are established ties respectively in first power signal input, first detected signal output, between second power signal input and the second detected signal output, let in the signal of telecommunication to first power signal input and second power signal input, sensing resistor feels the pressure that the touch main part pressed pressure sensor and produces deformation, first detected signal output and second detected signal output detect signal, detect out the size that the pressure that the touch main part pressed pressure sensor according to the size of detected signal. However, when the pressure sensor is not needed to perform pressure detection, as long as the first power signal end and the second power signal end of the pressure sensor are connected with current, the pressure sensor is always in a working state, and the working state of the pressure sensor cannot be effectively controlled, so that the static power consumption of the pressure sensor is greatly increased undoubtedly.
According to the embodiment of the invention, the thin film transistor is used for replacing the induction resistor in the conventional pressure sensor, and when the pressure sensor is not required to detect pressure, the thin film transistor can be controlled to be turned off by the control signal input from the control end of the thin film transistor, so that the pressure sensor is controlled to be in a non-working state, and the static power consumption of the pressure sensor is reduced.
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 circuit diagram of a pressure sensor according to an embodiment of the present invention. As shown in fig. 1, the pressure sensor S includes a first power signal input terminal a, a second power signal input terminal B, a first sensing signal output terminal C, a second sensing signal output terminal D, and a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and a fourth thin film transistor T4. The first thin film transistor T1 is connected in series between the first power signal input terminal a and the first detection signal output terminal C, the second thin film transistor T2 is connected in series between the first detection signal output terminal C and the second power signal input terminal B, the third thin film transistor T3 is connected in series between the second power signal input terminal B and the second detection signal output terminal D, and the fourth thin film transistor T4 is connected in series between the second detection signal output terminal D and the first power signal input terminal a.
The operation principle of the pressure sensor S for detecting pressure will be described below by taking the first thin film transistor as an example. Fig. 2 is a schematic cross-sectional structure diagram of a first thin film transistor in a pressure sensor according to an embodiment of the present invention. As shown in fig. 2, for example, in a direction away from the substrate 10, the first thin film transistor T1 may include a gate 201, a gate insulating layer 202, an active layer 203, and a source 204 and a drain 205 fabricated in the same layer, the active layer 203 includes a channel region 2031 and a non-channel region 2032, a portion of the active layer 203 in contact with the source 204 and the drain 205 is the non-channel region 2032 and has a higher doping concentration, and a portion of the active layer 203 not in contact with the source 204 and the drain 205 is the channel region 2031, and in order to prevent a short circuit between the source 204 and the drain 205 of the first thin film transistor T1, the doping concentration of the channel region 2031 is much less than the non-channel region 2032.
Specifically, referring to fig. 1 and 2, the channel region 2031 of the active layer 203 in the first thin film transistor T1 serves as a sense resistor at a position corresponding to the first thin film transistor T1 in the pressure sensor S, and is connected in series between the corresponding signal terminals through the source 204 and the drain 205 of the first thin film transistor T1, so as to form a complete path of the electrical signal. Since the doping concentration of the channel region 2031 of the active layer 203 is much less than that of the non-channel region 2032, the resistance of the sensing resistor of the pressure sensor S formed by the channel region 2031 is relatively large, and the area of the pressure sensor S is reduced.
Similarly, the channel regions of the active layers of the second tft T2, the third tft T3 and the fourth tft T4 respectively form sense resistors at positions where the pressure sensor S respectively corresponds to the second tft T2, the third tft T3 and the fourth tft T4, thereby further reducing the area of the pressure sensor.
Specifically, as shown in fig. 1, the channel region resistance R of the first thin film transistor T11A second thin film transistorChannel region resistance R of T22A channel region resistance R of the third thin film transistor T33And a channel region resistance R of the fourth thin film transistor T44Four arms of the bridge forming the wheatstone bridge type pressure sensor S may be connected with a galvanometer (not shown in fig. 1) between a first detection signal output terminal C and a second detection signal output terminal D of the pressure sensor S, and a constant voltage may be applied to a first power signal input terminal a and a second power signal input terminal B.
When the voltage of the first power signal input end A and the voltage of the second power signal input end B of the pressure sensor S have a certain difference, current passes through each branch in the bridge circuit. Channel region resistance R of the first thin film transistor T11A channel region resistor R of the second thin film transistor T22A channel region resistance R of the third thin film transistor T33And a channel region resistance R of the fourth thin film transistor T44Satisfy the requirement of
When the voltage is equal, the first detection signal output end C and the second detection signal output end D of the pressure sensor S are equal in potential, the current flowing through the galvanometer is zero, the pointer of the galvanometer indicates zero scale, the electric bridge is in a balanced state, and the balance is obtained
The bridge balance condition. When the channel region resistance R of the first thin film transistor T11A channel region resistor R of the second thin film transistor T22A channel region resistance R of the third thin film transistor T33And a channel region resistance R of the fourth thin film transistor T44When the bridge balance condition is not met, the first detection signal output end C and the second detection signal output end D of the pressure sensor S are not equal in potential, the current flowing through the galvanometer is not 0 at the moment, the pointer of the galvanometer deflects to output a corresponding signal value, and the pressure applied to the pressure sensor S is detected according to the signal value output by the galvanometer.
It should be noted that fig. 1 only exemplarily provides the first thin film transistor T1 as a bottom-gate structure, and the first thin film transistor T1 may also be provided as a top-gate structure, and the embodiment of the present invention does not limit whether the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, and the fourth thin film transistor T4 in the pressure sensor S are a top-gate structure or a bottom-gate structure.
The embodiment of the invention also provides a display panel which comprises the pressure sensor in the embodiment. Fig. 3a is a schematic top view of a display panel according to an embodiment of the present invention. As shown in fig. 3a, the display panel includes a display area AA and a peripheral circuit area NAA disposed around the display area, and the display panel includes a plurality of pressure sensors S, which may be disposed on the peripheral circuit area NAA of the display panel, where the pressure sensors S are disposed on two opposite sides of the peripheral circuit area NAA, so as to avoid the light shielding of the pressure sensors S from affecting the aperture ratio of the display panel.
Alternatively, the pressure sensor S may be disposed in the display area AA of the display panel, as shown in fig. 3b, and the pressure sensor S may be disposed in the opaque area in the display area AA of the display panel. For example, when the display panel is a liquid crystal touch display panel, the pressure sensor S may be disposed corresponding to a black matrix in the color film substrate. When the display panel is an organic light emitting display panel, the pressure sensor S may be disposed at a non-opening area of the display area AA.
Specifically, when the pressure sensor in the above embodiment is integrated in a display panel, the display panel includes a pixel driving circuit for driving pixels in the display panel to display, each pixel driving circuit includes a plurality of thin film transistors, and for the display panel integrated with the pressure sensor, in order to simplify a manufacturing process of the display panel in the prior art, when a heavily doped active layer structure in contact with a source electrode and a drain electrode in the thin film transistors is manufactured, the pressure sensor is generally manufactured by using the same material and the same layer as the heavily doped active layer structure. However, the sensing resistor of the pressure sensor formed by the heavily doped active layer material has a higher doping concentration, so that the resistance of the sensing resistor constituting the pressure sensor is smaller, and the space occupied by the sensing resistor constituting the pressure sensor is larger than that occupied by the sensing resistor having a large resistance.
According to the embodiment of the invention, the channel structure in the thin film transistor is used as the sensing resistor of the pressure sensor, the doping concentration of the channel structure in the thin film transistor is far less than that of the sensing resistor made of the same material and the same layer as the heavily doped active layer structure, the resistance value of the sensing resistor in the pressure sensor is increased, the space of the display panel occupied by the pressure sensor is reduced under the condition that the number of the pressure sensors in the display panel is the same, and the space utilization rate of the display panel is improved.
Alternatively, the display panel may include a plurality of pressure sensors, or may include only one pressure sensor. If only one pressure sensor is arranged in the display panel, the touch main body touches the display panel to enable the display panel to deform, shearing force can be generated at each position of the deformed display panel, the pressure sensor receives the action of the shearing force from the display panel, the impedance of the channel regions of the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor changes, the strain voltage of the pressure sensor changes, and the pressure value measured according to the strain voltage is the magnitude of the shearing force of the display panel at the position corresponding to the pressure sensor. Only when at least two pressure sensors are arranged in the display panel, the magnitude of the touch pressure can be calculated according to the magnitude of the large pressure measured by each pressure sensor and the information of the touch position.
Fig. 4 is a partially enlarged schematic view of a pressure sensor in a display panel according to an embodiment of the present invention. As shown in fig. 4, the display panel may further include at least one first control signal line 11, the second end a3 of the first thin film transistor T1 in the pressure sensor is electrically connected to the first end b2 of the first thin film transistor T1, the second end b3 of the second thin film transistor T2 is electrically connected to the first end c2 of the third thin film transistor T3, the second end c3 of the third thin film transistor T3 is electrically connected to the first end d2 of the fourth thin film transistor T4, and the second end d3 of the fourth thin film transistor T4 is electrically connected to the first end a2 of the first thin film transistor T1. For example, four first control signal lines 11 may be provided for each pressure sensor, that is, the control terminal a1 of the first thin film transistor T1, the control terminal b1 of the second thin film transistor T2, the control terminal c1 of the third thin film transistor T3, and the control terminal d1 of the fourth thin film transistor T4 of each pressure sensor may be electrically connected to one first control signal line 11, respectively.
Specifically, the control terminals of the first to fourth tfts T1 to T4 may be turned on or off corresponding first and second terminals under the action of the control signal inputted from the corresponding first control signal line 11. When the display panel does not need to perform pressure detection, a control signal can be input through the first control signal line 11 electrically connected with the control ends of the first thin film transistor T1 to the fourth thin film transistor T4 in the pressure sensor, and the first ends and the second ends of the first thin film transistor T1 to the fourth thin film transistor T4 in the pressure sensor are all in an off state, so that the static power consumption of the pressure sensor is effectively reduced, and further the static power consumption of the display panel is reduced.
Alternatively, the display panel may include a plurality of pressure sensors, and control terminals of the first to fourth thin film transistors in the same pressure sensor may be electrically connected to the same first control signal line. Fig. 5 is a partially enlarged schematic view of a pressure sensor in another display panel according to an embodiment of the invention. As shown in fig. 5, the control terminals of the first thin film transistor T1 to the fourth thin film transistor T4 in the same pressure sensor are all electrically connected to the same first control signal line 11, the first thin film transistor T1 to the fourth thin film transistor T4 in the same pressure sensor can be controlled to be turned off at the same time through the first control signal line 11, and the pressure sensor is controlled to be in a non-operating state, so that the static power consumption of the display panel is reduced. The connection of the control terminal of the thin film transistor in the pressure sensor shown in fig. 5 effectively reduces the number of the first control signal lines 11 electrically connected to the control terminal of the thin film transistor in the pressure sensor, compared to the connection of the control terminal of the thin film transistor in the pressure sensor shown in fig. 4.
Optionally, the display panel may further include a second control signal line, and the first control signal lines corresponding to all the pressure sensors may be electrically connected to the second control signal line. Fig. 6a is a partially enlarged schematic view of a pressure sensor in another display panel according to an embodiment of the present invention. As shown in fig. 6a, the first control signal lines 11 corresponding to all the pressure sensors (only two pressure sensors are exemplarily shown in fig. 6 a) are electrically connected to the second control signal line 12, that is, the control terminals of the first to fourth thin film transistors T1 to T4 in all the pressure sensors in the display panel are electrically connected to the second control signal line 12 in the display panel through the corresponding first control signal line 11, the control signals sent to the control terminals of the first to fourth thin film transistors T1 to T4 in all the pressure sensors through the second control signal line 12 can be simultaneously switched off from the first terminal to the second terminal of the first to fourth thin film transistors T1 to T4 in all the pressure sensors, all the pressure sensors are in the non-operation state, and on the basis of reducing the static power consumption of the display panel, the number of control signal lines controlling the operating state of the pressure sensor S in the display panel is further reduced.
Optionally, the display panel may also include a plurality of second control signal lines, the first control signal lines corresponding to different pressure sensors are electrically connected to different second control signal lines, as shown in fig. 6b, the first control signal lines 11 corresponding to the pressure sensor S1 and the pressure sensor S2 are electrically connected to different second control signal lines 12, and compared with the connection manner of the control ends of the thin film transistors in the pressure sensor shown in fig. 6a, the connection manner of the control ends of the thin film transistors in the pressure sensor shown in fig. 6b can control a part of the pressure sensors to be in an operating state, and a part of the pressure sensors to be in a non-operating state, so as to control the operating states of different pressure sensors. On the other hand, the connection mode of the control terminals of the thin film transistors in the pressure sensors shown in fig. 6B enables some pressure sensors to be in an operating state, and compared to the state where all pressure sensors in the display panel are in an operating state, the current on the signal lines electrically connected to the first power signal input terminal a and the second power signal input terminal B of the pressure sensors is smaller, thereby reducing the voltage drop of the current flowing through the fixed line resistor and increasing the voltage applied between the first power signal input terminal a and the second power signal input terminal B of each pressure sensor.
Fig. 7 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the invention. As shown in fig. 7, the display panel may include a substrate 10 and a pixel circuit layer 13 disposed on the substrate 10, where the pixel circuit layer 13 includes a plurality of driving thin film transistors T disposed in a display area AA of the display panel for driving pixel units 14 in the display panel to perform display. Alternatively, the first to fourth thin film transistors T1 to T4 (only the first thin film transistor T1 is exemplarily shown in fig. 7) in the pressure sensor may be disposed at the same layer as the driving thin film transistor T in the pixel circuit layer 13, that is, the active layer 301, the gate 302, the source 303, and the drain 304 of the first to fourth thin film transistors T1 to T4 are fabricated at the same layer as the active layer 401, the gate 402, the source 403, and the drain 404 of the driving thin film transistor T, respectively, so as to simplify the fabrication process of the display panel integrated with the pressure sensor.
Fig. 8a is a schematic top view of another display panel according to an embodiment of the present invention. As shown in fig. 8a, the display panel may further include first power signal lines 151, second power signal lines 152, first detection signal lines 161, and second detection signal lines 162, wherein the first power signal input terminal a of each pressure sensor (only one pressure sensor is exemplarily shown in fig. 8 a) is electrically connected to one of the first power signal lines 151, the second power signal input terminal B is electrically connected to one of the second power signal lines 152, the first detection signal output terminal C is electrically connected to one of the first detection signal lines 161, and the second detection signal output terminal D is electrically connected to one of the second detection signal lines 162. The display panel further includes a plurality of scan signal lines 171 and a plurality of data signal lines 172, the pixel units 14 are respectively located in the areas formed by the plurality of scan signal lines 171 and the plurality of data signal lines 172 in an interlaced manner, the control terminal e1 of each driving thin film transistor T is electrically connected to a scan signal line 171, the first terminal e2 is electrically connected to a data signal line 172, the scan signal line 171 supplies a scan signal to the control terminal e1 of the driving thin film transistor T electrically connected to the pixel unit 14, and the data signal line 172 supplies a data signal to the pixel units 14 through the first terminal e2 and the second terminal e3 of the thin film transistor T, so as to realize the display function of the display panel.
FIG. 8b is a schematic cross-sectional view along the direction AA' in FIG. 8 a. In conjunction with fig. 8a and 8b, the scan signal lines 171 may be disposed on the M1 film layer, and the data signal lines 712 may be disposed on the M2 layer. The pressure sensor may be disposed in the peripheral circuit area NAA of the display panel, and the first control signal line 11 electrically connected to the control terminals of the first to fourth thin film transistors T1 to T4 in the pressure sensor and the scan signal line 171 electrically connected to the control terminal e1 of the driving thin film transistor T may be disposed in the same layer, both of which are disposed in the M1 layer. A first power signal line 151 electrically connected to the first power signal input terminal a of the pressure sensor, a second power signal line 152 electrically connected to the second power signal input terminal B, a first detection signal line 161 electrically connected to the first detection signal output terminal C, and a second detection signal line 162 electrically connected to the second detection signal output terminal D may be further provided, and the data line signal line 172 electrically connected to the first terminal e2 of the driving thin film transistor T may be located at the same layer and all located at the M2 layer. Since the pressure sensor includes a transistor structure similar to that of the driving thin film transistor, the manufacturing process of the display panel integrated with the pressure sensor can be simplified.
Optionally, the display panel may further include a plurality of touch electrodes, each of the touch electrodes is electrically connected to a touch signal line, and the first power signal line, the second power signal line, the first detection signal line, and the second detection signal line may be located on the same layer as the touch signal line. Fig. 9a is a schematic cross-sectional structure view of another display panel according to an embodiment of the invention. As shown in fig. 9a, a touch signal line 181 electrically connected to the touch electrode may be disposed at an M3 layer, a first power signal line 151 electrically connected to a first power signal input terminal a of the pressure sensor, a second power signal line 152 electrically connected to a second power signal input terminal B, a first detection signal line 161 electrically connected to a first detection signal output terminal C, and a second detection signal line 162 electrically connected to a second detection signal output terminal D may be disposed at the same layer as the touch signal line 181, i.e., the first power signal line 151, the second power signal line 152, the first detection signal line 161, and the second detection signal line 162 may be disposed at an M3 layer. For example, fig. 9a illustrates that the touch electrode is a self-capacitance touch electrode, and the touch signal lines 181 electrically connected to the touch electrode are all located in the display area AA of the display panel, and may also be mutual-capacitance touch electrodes, which is not limited in the embodiment of the present invention.
Optionally, at least one of the first power signal line, the second power signal line, the first detection signal line, and the second detection signal line may be located in the same layer as the data signal line, and at least one may be located in the same layer as the touch signal line. Fig. 9B is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the invention, and as shown in fig. 9B, a first power signal line 151 electrically connected to a first power signal input terminal a of the pressure sensor, a second power signal line 152 electrically connected to a second power signal input terminal B, a first detection signal line 161 electrically connected to a first detection signal output terminal C, and a second detection signal line 162 electrically connected to a second detection signal output terminal D may be wired by using a layer M2 where a data signal line 172 electrically connected to the driving thin film transistor is located and a layer M3 where a touch signal line 181 electrically connected to the touch electrode is located. For example, the first power signal line 151 and the second power signal line 152 may be disposed at the same layer as the data signal line 172, and the first detection signal line 161 and the second detection signal line 162 may be disposed at the same layer as the touch signal line 181, which may also simplify the manufacturing process of the display panel integrated with the pressure sensor.
It should be noted that the drawings of the embodiments of the present invention only show the size of each element and the thickness of each film layer by way of example, and do not represent the actual size of each element and each film layer in the display panel.
The embodiment of the invention utilizes the thin film transistor to replace the sensing resistor which is manufactured by the same layer of the heavily doped active layer structure and the same material in the current pressure sensor, the channel structure in the thin film transistor is used as the sensing resistor of the pressure sensor, and the doping concentration of the channel structure in the thin film transistor is far less than that of the sensing resistor which is manufactured by the same layer of the heavily doped active layer structure and the same material in the same layer, so that the resistance value of the sensing resistor in the pressure sensor is increased, the space of the display panel occupied by the pressure sensor is reduced under the condition that the number of the pressure sensors in the display panel is the same, and the space utilization rate of the display panel is improved. Meanwhile, when the pressure sensor is not needed to detect pressure, the thin film transistor can be controlled to be turned off through a control signal input by the control end of the thin film transistor, so that the pressure sensor is controlled to be in a non-working state, and the static power consumption of the pressure sensor is reduced.
An embodiment of the present invention further provides a display device, and fig. 10 is a schematic structural diagram of the display device provided in the embodiment of the present invention. As shown in fig. 10, the display device 20 includes the display panel 19 in the above embodiment, so that the display device 20 provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, and further description is omitted here. The display device 20 may be an organic light emitting display device, a liquid crystal display device, or other types of pressure sensing devices or display devices. The display device 20 may be an electronic display device such as a mobile phone, a computer, or a television.
The embodiment of the present invention further provides a control method of the pressure sensor according to the above embodiment, and fig. 11 is a schematic flow chart of the control method of the pressure sensor according to the embodiment of the present invention. The control method includes a pressure sensing detection stage and a pressure sensing gap stage, and as shown in fig. 11, the control method includes:
and S110, controlling the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor to be conducted in a pressure sensing detection stage.
Specifically, as shown in fig. 1, in the pressure sensing stage, the control terminals of the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3 and the fourth thin film transistor T4 may control the first terminals and the second terminals of the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3 and the fourth thin film transistor T4 to be communicated, that is, the first thin film transistor T1 to the fourth thin film transistor T4 are all in the on state.
And S120, inputting a first power supply signal through the first power supply signal input end and inputting a second power supply signal through the second power supply signal input end.
Specifically, as shown in fig. 1, when the first to fourth thin film transistors T1 to T4 in the pressure sensor S are all in the on state, a first power signal may be input to the pressure sensor S through the first power signal input terminal a, and a second power signal may be input to the pressure sensor S through the second power signal input terminal B.
And S130, detecting the pressure of the touch body pressing the pressure sensor through the first detection signal output by the first detection signal output end and the second detection signal output by the second detection signal output end.
Specifically, as shown in fig. 1, when a first power signal is input to the first power signal input terminal a of the pressure sensor S and a second power signal is input to the second power signal input terminal B, the touch subject presses the pressure sensor S, the resistances of the channel resistances of the first thin film transistor T1 to the fourth thin film transistor T4 of the pressure sensor S change, the channel resistances no longer satisfy the bridge balance condition of the pressure sensor S, an electrical signal is output from the first detection signal output terminal C and the second detection signal output terminal D of the pressure sensor S, and the magnitude of the pressure applied to the pressure sensor S by the touch subject can be detected by detecting the first detection signal output terminal C and the second detection signal output terminal D.
And S140, controlling the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor to be turned off at the pressure-sensitive gap stage.
Specifically, as shown in fig. 1, in the pressure sensing gap stage, that is, when the pressure sensor S does not need to perform pressure detection, the first ends corresponding to the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, and the fourth thin film transistor T4 may be controlled to be disconnected from the second ends by the control ends of the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, and the fourth thin film transistor T4, that is, the first thin film transistor T1 to the fourth thin film transistor T4 are all in the off state, so as to reduce the static power consumption of the pressure sensor S. This is because, although the first power signal input terminal a and the second power signal input terminal B are still applied with constant voltages, that is, the first power signal input terminal a is still inputting the first power signal to the pressure sensor S, and the second power signal input terminal B is still inputting the second power signal to the pressure sensor S, since all four resistors of the wheatstone bridge are in the off state, no current flows through the bridge, and thus no power consumption is generated by the bridge, and the static power consumption of the pressure sensor S is reduced.
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 (10)
1. A display panel is characterized by comprising a pressure sensor, wherein the pressure sensor comprises a first power supply signal input end, a second power supply signal input end, a first detection signal output end, a second detection signal output end, a first thin film transistor, a second thin film transistor, a third thin film transistor and a fourth thin film transistor;
the first thin film transistor is connected in series between the first power signal input end and the first detection signal output end, the second thin film transistor is connected in series between the first detection signal output end and the second power signal input end, the third thin film transistor is connected in series between the second power signal input end and the second detection signal output end, and the fourth thin film transistor is connected in series between the second detection signal output end and the first power signal input end;
further comprising:
at least one first control signal line;
the second end of the first thin film transistor is electrically connected with the first end of the second thin film transistor, the second end of the second thin film transistor is electrically connected with the first end of the third thin film transistor, the second end of the third thin film transistor is electrically connected with the first end of the fourth thin film transistor, and the second end of the fourth thin film transistor is electrically connected with the first end of the first thin film transistor;
the control ends of the first thin film transistor to the fourth thin film transistor are respectively electrically connected with a corresponding first control signal line, or the control ends of the first thin film transistor to the fourth thin film transistor are electrically connected with the same first control signal line;
further comprising:
a substrate;
a pixel circuit layer on the substrate, the pixel circuit layer including a plurality of driving thin film transistors;
the first thin film transistor to the fourth thin film transistor in the pressure sensor are located in the same layer as the driving thin film transistor in the pixel circuit layer;
the first control signal line is used for controlling the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor to be conducted in a pressure sensing detection stage;
the first control signal line is used for controlling the first thin film transistor, the second thin film transistor, the third thin film transistor and the fourth thin film transistor to be turned off in a pressure-sensitive gap stage.
2. The display panel according to claim 1, comprising a plurality of the pressure sensors;
the control ends of the first thin film transistor and the fourth thin film transistor in the same pressure sensor are electrically connected with the same first control signal line.
3. The display panel according to claim 2, further comprising:
a second control signal line;
the first control signal lines corresponding to all the pressure sensors are electrically connected with the second control signal lines.
4. The display panel according to claim 2, further comprising:
a plurality of second control signal lines;
the first control signal lines corresponding to different pressure sensors are electrically connected with different second control signal lines.
5. The display panel according to claim 1, further comprising:
a first power supply signal line, a second power supply signal line, a first detection signal line, and a second detection signal line;
a first power signal input end of each pressure sensor is electrically connected with one first power signal wire, a second power signal input end of each pressure sensor is electrically connected with one second power signal wire, a first detection signal output end of each pressure sensor is electrically connected with one first detection signal wire, and a second detection signal output end of each pressure sensor is electrically connected with one second detection signal wire;
the control end of each driving thin film transistor is electrically connected with a scanning signal line, and the first end of each driving thin film transistor is electrically connected with a data signal line;
the first control signal line and the scanning signal line are located on the same layer.
6. The display panel according to claim 5, wherein the first power supply signal line, the second power supply signal line, the first detection signal line, and the second detection signal line are all located in the same layer as the data signal line.
7. The display panel according to claim 5, further comprising:
the touch control device comprises a plurality of touch control electrodes, a plurality of touch control signal wires and a plurality of touch control signals, wherein each touch control electrode is electrically connected with a touch control signal wire;
the first power signal line, the second power signal line, the first detection signal line and the second detection signal line are all located on the same layer as the touch signal line.
8. The display panel according to claim 5, further comprising:
the touch control device comprises a plurality of touch control electrodes, a plurality of touch control signal wires and a plurality of touch control signals, wherein each touch control electrode is electrically connected with a touch control signal wire;
at least one of the first power signal line, the second power signal line, the first detection signal line, and the second detection signal line is located at the same layer as the data signal line, and at least one is located at the same layer as the touch signal line.
9. The display panel according to claim 1, comprising:
the display device comprises a display area and a peripheral circuit area arranged around the display area; the pressure sensor is positioned in the peripheral circuit area.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
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| CN102243126A (en) * | 2011-04-14 | 2011-11-16 | 黑龙江大学 | Nano silicon thin film transistor pressure sensor |
| CN105606158A (en) * | 2016-03-16 | 2016-05-25 | 黑龙江大学 | Force/magnetism multifunctional sensor |
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| JP2010218066A (en) * | 2009-03-13 | 2010-09-30 | Seiko Epson Corp | Display device with touch sensor function, method for manufacturing display device with touch sensor function, and electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102243126A (en) * | 2011-04-14 | 2011-11-16 | 黑龙江大学 | Nano silicon thin film transistor pressure sensor |
| CN105606158A (en) * | 2016-03-16 | 2016-05-25 | 黑龙江大学 | Force/magnetism multifunctional sensor |
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