CN107368218B - Array substrate, touch display panel and display device thereof - Google Patents
Array substrate, touch display panel and display device thereof Download PDFInfo
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- CN107368218B CN107368218B CN201710563719.XA CN201710563719A CN107368218B CN 107368218 B CN107368218 B CN 107368218B CN 201710563719 A CN201710563719 A CN 201710563719A CN 107368218 B CN107368218 B CN 107368218B
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- connecting bridge
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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
- G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
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Abstract
The embodiment of the invention provides an array substrate, a touch display panel and a display device thereof, which are used for solving the problem of low sensitivity of frame glue to a pressure sensor. The array substrate comprises a bias voltage applying circuit and a plurality of pressure sensors arranged along a first extending direction of the array substrate; the bias voltage applying circuit is respectively electrically connected with the pressure sensors and is used for applying bias voltage to the pressure sensors; the bias voltage value of the pressure sensor is positively correlated with the distance from the pressure sensor to the central point of the array substrate. The invention is suitable for the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to an array substrate, a touch display panel and a display device of the touch display panel.
Background
At present, many electronic devices on the market can perform interface operation through touch control. When a user touches the display panel with a finger, the display panel transmits a signal into the electronic device. Some devices may detect the touch pressure through a resistive pressure sensor, that is, measure the touch pressure by detecting a change in resistance of the pressure sensor.
In the touch display device in the prior art, because the position of the pressure sensor is close to the frame, the pressure sensor is easily influenced by the frame glue, and when the same pressing force is pressed on the panel of the touch display device, the deformation quantity of the pressure sensor which is greatly influenced by the frame glue is smaller, so that the signal value output by the pressure sensor is smaller, and the sensitivity of the pressure sensor is smaller.
Disclosure of Invention
In view of this, embodiments of the present invention provide an array substrate, a touch display panel and a display device thereof, which are used to solve the problem of low sensitivity of a frame sealant to a pressure sensor.
In a first aspect, an embodiment of the present invention provides an array substrate, where the array substrate includes a bias voltage applying circuit and a plurality of pressure sensors arranged along a first extending direction of the array substrate;
the bias voltage applying circuit is respectively electrically connected with the pressure sensors and is used for applying bias voltage to the pressure sensors;
the bias voltage value of the pressure sensor is positively correlated with the distance from the pressure sensor to the central point of the array substrate.
Optionally, the pressure sensor includes a first connection end, a second connection end, a third connection end, and a fourth connection end;
the bias voltage applying circuit comprises a first input end and a second input end;
the array substrate further comprises a signal detection circuit, wherein the signal detection circuit is used for detecting an output signal of the pressure sensor and comprises a first output end and a second output end;
the first connecting end is electrically connected with the first input end, and the third connecting end is electrically connected with the second input end;
the second connecting end is electrically connected with the second output end, and the fourth connecting end is electrically connected with the first output end.
Optionally, the pressure sensor is of a quadrilateral structure, and four sides of the quadrilateral are in one-to-one correspondence with the four connecting ends.
Optionally, an extension line of the first connection end of the pressure sensor intersects with the first extension direction, and an intersection included angle range is greater than 10 degrees and less than 80 degrees.
Optionally, the intersecting angle is 45 degrees.
Optionally, the pressure sensor includes a first connecting bridge, a second connecting bridge, a third connecting bridge and a fourth connecting bridge which are sequentially connected end to end;
the bias voltage applying circuit comprises a first input end and a second input end;
the array substrate further comprises a signal detection circuit, wherein the signal detection circuit is used for detecting an output signal of the pressure sensor and comprises a first output end and a second output end;
the first end of the first connecting bridge is electrically connected with the first input end, and the first end of the third connecting bridge is electrically connected with the second input end; the second end of the first connecting bridge is electrically connected with the first output end, and the second end of the second connecting bridge is electrically connected with the second output end;
the component of the length of the first connecting bridge arm in the first extending direction is smaller than the component of the length of the first connecting bridge arm in the second extending direction of the array substrate; the component of the length of the second connecting bridge arm in the first extending direction is larger than the component in the second extending direction; the component of the length of the third connecting bridge arm in the first extending direction is smaller than the component in the second extending direction; the length of the fourth connecting bridge arm has a component in the first direction of extension that is greater than a component in the second direction of extension.
Optionally, bridge arms of the first connecting bridge and the third connecting bridge are parallel to a second extending direction of the array substrate, and bridge arms of the second connecting bridge and the fourth connecting bridge are parallel to a first extending direction of the array substrate;
the first extending direction is perpendicular to the second extending direction.
Optionally, the reference resistance values of the first connecting bridge, the second connecting bridge, the third connecting bridge and the fourth connecting bridge are the same.
Optionally, at least one of the first connecting bridge, the second connecting bridge, the third connecting bridge and the fourth connecting bridge is a zigzag structure.
Optionally, one bias voltage applying circuit applies a bias voltage to a corresponding one of the pressure sensors;
alternatively, one bias voltage applying circuit applies a bias voltage to a plurality of pressure sensors.
Optionally, the pressure sensor is located in a non-display area of the array substrate.
Optionally, the pressure sensor and the active layer of the thin film transistor of the array substrate are located on the same film layer.
A second aspect of the present invention provides a touch display panel, where the touch display panel includes the array substrate according to the first aspect of the present invention, a color filter substrate disposed opposite to the array substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate.
The third aspect of the present invention provides a display device comprising the touch display panel of the second aspect of the present invention.
One of the above technical solutions has the following beneficial effects:
when the array substrate is pressed with the same force, because the bias voltage value of the pressure sensor (the pressure sensor far away from the center of the array substrate) greatly influenced by the frame sealant is larger than the bias voltage value of the pressure sensor (the pressure sensor near the center of the array substrate) less influenced by the frame sealant, the output signal value of the pressure sensor greatly influenced by the frame sealant is close to the output signal value of the pressure sensor less influenced by the frame sealant, and therefore, the sensitivity of the pressure sensor far away from the center of the array substrate is close to the sensitivity of the pressure sensor near the center of the array substrate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic diagram of a Wheatstone bridge according to the present embodiment of the invention;
fig. 2 is a schematic view of a first structure of an array substrate according to an embodiment of the present invention;
FIG. 3 is a first schematic diagram illustrating the connection relationship between a pressure sensor and a bias voltage applying circuit according to an embodiment of the present invention;
FIG. 4 is a second schematic diagram illustrating the connection relationship between the pressure sensor and the bias voltage applying circuit according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a first configuration of a pressure sensor provided in accordance with an embodiment of the present invention;
fig. 6 is a schematic view of a second structure of the array substrate according to the embodiment of the invention;
FIG. 7 is a second schematic diagram of a pressure sensor according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a third structure of a pressure sensor provided in an embodiment of the present invention;
fig. 9 is a schematic view of a third structure of the array substrate according to the embodiment of the invention;
fig. 10 is a fourth structural diagram of the pressure sensor according to the embodiment of the present invention;
fig. 11 is a schematic diagram of a fifth structure of the pressure sensor according to the embodiment of the present invention;
fig. 12 is a schematic diagram illustrating a sixth structure of a pressure sensor according to an embodiment of the present invention;
FIG. 13 is a cross-sectional view taken at location A-A' of FIG. 9 according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a touch display panel according to an embodiment of the invention;
fig. 15 is an exemplary diagram of a display device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the connecting bridges in the embodiments of the present invention, the connecting bridges should not be limited to these terms. These terms are only used to distinguish the connecting bridges from each other. For example, the first connecting bridge may also be referred to as the second connecting bridge, and similarly, the second connecting bridge may also be referred to as the first connecting bridge, without departing from the scope of embodiments of the present invention; likewise, the third connecting bridge may also be referred to as the first connecting bridge.
Before the technical solution of the present invention is explained in detail, the principle of the wheatstone bridge needs to be briefly explained:
fig. 1 is a schematic diagram of a wheatstone bridge according to the present embodiment of the present invention. As shown in FIG. 1, the four resistors Ra, Rb, Rc, and Rd of the Wheatstone bridge, referred to as the four legs of the Wheatstone bridge, are connected as a quadrilateral ABCD. One diagonal BD of the quadrilateral ABCD is connected to a galvanometer G, referred to as a "bridge". The other diagonal AC of the quadrilateral ABCD is connected to a power supply E. When the power supply E is switched on, current passes through each branch in the bridge circuit. When the resistances of the four resistors Ra, Rb, Rc and Rd satisfy Ra/Rb-Rd/Rc, the potentials between the two points B, D are equal, the current flowing through the galvanometer G in the bridge circuit is 0, the pointer of the galvanometer G indicates zero scale, the wheatstone bridge is in balance, and Ra/Rb-Rd/Rc is called wheatstone bridge balance condition. When the resistances of the four resistors Ra, Rb, Rc and Rd do not satisfy the bridge balance condition, the potentials between the two points B, D are not equal, the current flowing through the galvanometer G in the bridge circuit is not 0, the pointer of the galvanometer G deflects, and a corresponding signal value is output.
When the wheatstone bridge is disposed on an object to be tested, such as a touch display panel, and pressure is applied to the touch display panel, the touch display panel deforms, and then Ra, Rb, Rc, and Rd disposed on the touch display panel deform, resulting in a corresponding change in resistance thereof, so that the bridge loses balance, and the galvanometer G outputs a corresponding signal value. And because the pressure value has a certain corresponding relation with the signal value output by the galvanometer, the corresponding pressure value can be obtained by acquiring the signal value output by the galvanometer in the process of detecting the pressure.
The present embodiment provides an array substrate, as shown in fig. 2, which is a schematic view of a first structure of the array substrate provided in the embodiment of the present invention. The array substrate 1 includes a bias voltage applying circuit 40 and a plurality of pressure sensors 101 to 108 arranged along a first extending direction 100 of the array substrate.
With reference to the orientation shown in fig. 2, the bias voltage applying circuit 40 on the left side of fig. 2 is electrically connected to the pressure sensors 101, 103, 105, and 107, respectively, and the bias voltage applying circuit 40 on the right side of fig. 2 is electrically connected to the pressure sensors 102, 104, 106, and 108, respectively. The bias voltage applying circuit 40 is used to apply a bias voltage to the pressure sensor connected thereto.
The pressure sensors 101-108 are located at the edge of the array substrate 1, the border adhesive is arranged at the edge of the array substrate 1, the border adhesive has certain elasticity, and the elasticity of the border adhesive is far greater than that of the pressure sensors. When a user presses the array substrate with the same pressing force, the deformation amount during pressing is a certain value due to the unchanged pressing force, so that the border frame glue is deformed under stress to bear a part of deformation amount, and at the moment, the deformation amount borne by the pressure sensor is reduced, so that the output signal value is smaller, and the sensitivity of the pressure sensor is further reduced. When the distance from the central point of the array substrate is farther, the influence of the frame glue is larger, and the sensitivity of the pressure sensor is smaller than that of the pressure sensor close to the center of the array substrate. For example, when the pressure sensor is located at a position where the short side and the long side of the array substrate intersect, it is affected by the sealant from both the short side direction and the long side direction of the array substrate, and thus its sensitivity is much smaller than that of the pressure sensor located at the short side or the long side of the array substrate.
In the embodiment, the influence caused by the frame glue problem is improved by changing the bias voltage value of the pressure sensor. Specifically, the bias voltage value of the pressure sensor is positively correlated with the distance from the pressure sensor to the central point of the array substrate 1. Still taking the orientation shown in fig. 2 as a reference, taking four pressure sensors along the first extending direction 100 on the left side of fig. 2 as an example, the bias voltage value of the pressure sensor 101 is greater than that of the pressure sensor 103, and similarly, the bias voltage value of the pressure sensor 107 is greater than that of the pressure sensor 105. The problem that deformation of the pressure sensor becomes small due to certain deformation of the frame glue is compensated by increasing the bias voltage value of the pressure sensor greatly influenced by the frame glue. At this time, when the array substrate is pressed with the same force, since the bias voltage value of the pressure sensor (the pressure sensor far from the center of the array substrate) greatly affected by the sealant is greater than the bias voltage value of the pressure sensor (the pressure sensor near the center of the array substrate) less affected by the sealant, the output signal value of the pressure sensor greatly affected by the sealant is close to the output signal value of the pressure sensor less affected by the sealant, and thus, the sensitivity of the pressure sensor far from the center of the array substrate is close to the sensitivity of the pressure sensor near the center of the array substrate.
It should be noted that, as an example, in fig. 2, a plurality of pressure sensors are connected to one power supply end, for example, the pressure sensors 101 to 107 are connected to the same power supply, but the voltage values applied by the power supplies to the corresponding pressure sensors are different, and for the completeness of the present solution, the present embodiment provides a specific implementation manner that a switch may be provided between the power supply and the pressure sensors, the voltage may be applied to the different pressure sensors in a time-sharing manner, and corresponding signal values may be output. By way of example, fig. 2 shows only 8 pressure sensors, and in fact, the present implementation does not specifically limit the specific number of pressure sensors. In addition, the first extending direction may be a direction perpendicular to the paper as shown in fig. 2, or may be a horizontal direction perpendicular to the first extending direction 100, and the specific direction of the first extending direction is not particularly limited in this embodiment.
In one specific embodiment, one bias voltage applying circuit applies a bias voltage to a corresponding one of the pressure sensors. Alternatively, one bias voltage applying circuit applies bias voltages to the plurality of pressure sensors. Specifically, as shown in fig. 3 and 4, fig. 3 is a first schematic diagram illustrating a connection relationship between the pressure sensor and the bias voltage applying circuit according to the embodiment of the present invention. Fig. 4 is a second schematic diagram illustrating a connection relationship between the pressure sensor and the bias voltage applying circuit according to the embodiment of the present invention. As shown in fig. 3, a bias voltage applying circuit 401 applies a bias voltage to the pressure sensor 101, a bias voltage applying circuit 402 applies a bias voltage to the pressure sensor 103, a bias voltage applying circuit 403 applies a bias voltage to the pressure sensor 105, and a bias voltage applying circuit 404 applies a bias voltage to the pressure sensor 107. As shown in fig. 4, the connection relationship of four pressure sensors along the first extending direction 100 on the left side of fig. 4 is explained by taking the orientation shown in fig. 4 as a reference, a bias voltage applying circuit 402 applies bias voltages to the pressure sensor 103 and the pressure sensor 105, and the pressure sensors 101 and 107 are respectively electrically connected to different bias voltage applying circuits 401 and 403 in a one-to-one correspondence manner. And adjusting the value of the bias voltage appropriately according to the influence degree of the frame glue on each pressure sensor, so that each pressure sensor has the best sensitivity.
In addition, due to the line voltage division, the divided voltage obtained by the pressure sensor far away from the power supply is small, and at this time, when the user presses the array substrate with the same pressing force, the deformation quantity borne by the pressure sensor far away from the power supply is small due to the small divided voltage obtained, so that the output signal value is small, and the sensitivity of the pressure sensor far away from the power supply is poor. Therefore, different bias voltages are applied to different pressure sensors, and the problem of poor sensitivity of the pressure sensors caused by line voltage division is effectively compensated, so that the sensitivity of the pressure sensors is further improved.
It should be noted that, as an example, fig. 3 only shows 4 pressure sensors and 4 bias voltage applying circuits, and fig. 4 shows 8 pressure sensors and 6 bias voltage applying circuits, and in fact, the number of the pressure sensors and the bias voltage applying circuits included in the array substrate is not particularly limited in this embodiment.
In another implementation, as shown in fig. 5 and 6, fig. 5 is a schematic diagram of a first structure of a pressure sensor provided in an embodiment of the present invention. Fig. 6 is a schematic view of a second structure of the array substrate according to the embodiment of the invention. The connection relationship between the pressure sensor and the bias voltage applying circuit and the detection circuit will be described by taking the pressure sensor 101 as an example. The pressure sensor 101 includes a first connection end 1011, a second connection end 1012, a third connection end 1013, and a fourth connection end 1014. The bias voltage applying circuit 40 includes a first input terminal IN1 and a second input terminal IN 2. The array substrate 1 further includes a signal detection circuit 50 for detecting an output signal of the pressure sensor, and the signal detection circuit 50 includes a first output terminal OUT1 and a second output terminal OUT 2. The first connection terminal 1011 is electrically connected to the first input terminal IN1, and the third connection terminal 1013 is electrically connected to the second input terminal IN 2; the second connection terminal 1012 is electrically connected to the second output terminal OUT2, and the fourth connection terminal 1014 is electrically connected to the first output terminal OUT 1.
Furthermore, the pressure sensor is of a quadrilateral structure, and four sides of the quadrilateral are in one-to-one correspondence with the four connecting ends. The pressure sensor can be made of metal, semiconductor, alloy and the like. In the embodiment, the X-type MEMS (Micro-electro mechanical Systems) pressure sensor can be preferably manufactured by using silicon (polysilicon or amorphous silicon). When the X-type MEMS pressure sensor works, voltage signals can be input through the two input ends, and voltage difference is output from the other two opposite ends. Because the voltage difference and the pressure born by the X-type MEMS pressure sensor are in a certain relation, the corresponding pressing force can be obtained by detecting the voltage difference of the output end. The X-type MEMS pressure sensor is made of the same material in a whole piece, so that the temperature difference of each connecting end is basically the same, and the influence of the temperature on the pressure sensor can be effectively eliminated. In addition, since the reference resistance values of the first connection end, the second connection end, the third connection end and the fourth connection end are all the silicon-based resistance values, the reference resistance values are large, so that the corresponding deformation quantity is large, and the output signal value is large.
It should be noted that, as an example, in fig. 6, a plurality of pressure sensors are connected to one power supply end, for example, the pressure sensors 101 to 105 are connected to the same power supply, but the power supplies apply different voltage values to the corresponding pressure sensors, and for the completeness of the present solution, this embodiment provides a specific implementation manner that, for the sake of completeness of the present solution, a switch may be provided between the power supply and the pressure sensors, voltages may be applied to the different pressure sensors in a time-sharing manner, and corresponding signal values may be output. Fig. 6 shows only 8 pressure sensors, 2 bias voltage applying circuits, and 2 signal detecting circuits as an example, and in fact, the present embodiment does not particularly limit the number of pressure sensors, bias voltage applying circuits, and signal detecting circuits. The first input terminal IN1 IN this embodiment is a positive power voltage, and the second input terminal IN2 is a ground voltage GND. Also, the signal detected by the signal detection circuit may be a current signal or a voltage signal.
Still further, with continued reference to fig. 5, the extension line of the first connection end 1011 of the pressure sensor 101 intersects the first extending direction 100, the intersecting angle is designated as α, and the range of the intersecting angle α is greater than 10 degrees and less than 80 degrees.
In another specific implementation, as shown in fig. 7, 8 and 9, fig. 7 is a second schematic structural diagram of the pressure sensor according to the embodiment of the present invention, fig. 8 is a third schematic structural diagram of the pressure sensor according to the embodiment of the present invention, and fig. 9 is a third schematic structural diagram of the array substrate according to the embodiment of the present invention. The pressure sensor comprises a first connecting bridge R1, a second connecting bridge R2, a third connecting bridge R3 and a fourth connecting bridge R4 which are sequentially connected end to end. Also, the bias voltage applying circuit 40 includes a first input terminal IN1 and a second input terminal IN 2. The array substrate 1 further includes a signal detection circuit 50 for detecting an output signal of the pressure sensor, the signal detection circuit including a first output terminal OUT1 and a second output terminal OUT 2.
It should be noted that, as an example, in fig. 9, a plurality of pressure sensors are connected to one power supply end, for example, the pressure sensors 101 to 105 are connected to the same power supply, but the power supplies apply different voltage values to the corresponding pressure sensors, and for the completeness of the present solution, this embodiment provides a specific implementation manner that, for the sake of completeness of the present solution, a switch may be provided between the power supply and the pressure sensors, voltages may be applied to the different pressure sensors in a time-sharing manner, and corresponding signal values may be output.
A first end of the first connecting bridge R1 is electrically connected to the first input terminal IN1, and a first end of the third connecting bridge R3 is electrically connected to the second input terminal IN 2; the second terminal of the first connecting bridge R1 is electrically connected to the first output terminal OUT1, and the second terminal of the second connecting bridge R2 is electrically connected to the second output terminal OUT 2.
With continued reference to fig. 7 and 8, since the variation of the resistance value is proportional to the variation of the deformation amount, the strain applied to the connecting bridge in a certain direction can be adjusted by adjusting the resistance value in the direction. Specifically, a component of the length of the bridge arm of the first connecting bridge R1 in the first extending direction 100 is smaller than a component of the length of the bridge arm of the array substrate in the second extending direction 200; the component of the length of the leg of the second connecting bridge R2 in the first direction of extension 100 is greater than the component in the second direction of extension 200; the component of the length of the leg of the third connecting bridge R3 in the first direction of extension 100 is smaller than the component in the second direction of extension 200; the length of the leg of fourth connecting bridge R4 has a component in first direction of extension 100 that is greater than a component in second direction of extension 200. Still taking the first connecting bridge R1 as an example, since the length of the arm in the second extending direction of the first connecting bridge R1 is greater than the length of the arm in the first extending direction, the first connecting bridge R1 mainly bears the strain in the second extending direction, and similarly, the second connecting bridge R2 mainly bears the strain in the first extending direction. IN addition, as shown IN fig. 7, the two input terminals divide the circuit into two branches, one of which is IN1 and reaches IN2 through R1 and R4, and the other of which reaches IN2 through R2 and R3 from IN1, IN each branch, because the strain directions of two adjacent connecting bridges are different, the maximum resistance difference is obtained IN a certain direction, and thus the deformation amount is maximized, so that the signal value at the output terminal is large, and the sensitivity is high. Please refer to the first and fourth connecting bridges for the strain directions borne by the third and fourth connecting bridges, which are not described herein again.
As shown in fig. 7, the extending direction of the first connecting bridge R1 may have an angle (not shown) with the first extending direction 100, or the extending direction of the first connecting bridge R1 may be perpendicular to the first extending direction 100. However, when the connection bridge forms an included angle with the first extending direction of the array substrate, and when the array substrate bears a certain pressing force, the length of the first connection bridge in the second extending direction is the projection of the first connection bridge in the second extending direction, and since the length of the projection is smaller than the length of the bridge arm of the first connection bridge, the amount of deformation of the first connection bridge in the second extending direction is smaller, so that the signal value of the output end is smaller, and the sensitivity is smaller. Therefore, in the present embodiment, as shown in fig. 8, the legs of the first connecting bridge R1 and the third connecting bridge R3 are parallel to the second extending direction 200 of the array substrate, and the legs of the second connecting bridge R2 and the fourth connecting bridge R4 are parallel to the first extending direction 100 of the array substrate; the first extending direction 100 is perpendicular to the second extending direction. The setting angle of the connecting bridge and the array substrate can also influence the signal value of the output end.
As shown in fig. 7 and 8, the resistance value of the first connecting bridge R1 and the resistance value of the second connecting bridge R2 of the pressure sensor may be set to be the same, and the resistance values of the third connecting bridge R3 and the fourth connecting bridge R4 may be the same. However, in order to reduce the output base value of the bridge in the unstrained state, the accuracy of measuring the change in the bridge output value in the strained state is improved. The reference resistance values of the first connecting bridge, the second connecting bridge, the third connecting bridge and the fourth connecting bridge may be set to be the same. Therefore, the output signal value of the pressure sensor is zero, the signal output caused by strain is favorably measured, and the measurement precision of the output value of the bridge under the strain is improved.
Further, as shown in fig. 10, it is a schematic diagram of a fourth structure of the pressure sensor provided in the embodiment of the present invention. In order to increase the reference resistance value of the connection bridge in a limited area, at least one of the first connection bridge, the second connection bridge, the third connection bridge, and the fourth connection bridge may be provided in a zigzag structure, for example. More specifically, as shown in fig. 11, it is a schematic diagram of a fifth structure of the pressure sensor according to the embodiment of the present invention. The first connecting bridge R1, the second connecting bridge R2, the third connecting bridge R3 and the fourth connecting bridge R4 are all set to be of a broken line structure, on one hand, the size of the connecting bridge is reduced while the connecting bridge is guaranteed to have a large reference resistance value, the connecting bridge is distributed in a small area, and therefore the influence of temperature difference on output signal values is eliminated. On the other hand, the contact area between the connecting bridge and the array substrate can be increased, so that the connecting bridge can sense the strain of the array substrate more accurately, and the accuracy of an output signal value is improved.
Further, as shown in fig. 12, a sixth structural schematic diagram of the pressure sensor according to the embodiment of the present invention is provided. In order to realize the synchronous change of the temperatures of the plurality of connecting bridges, the first connecting bridge R1, the second connecting bridge R2, the third connecting bridge R3 and the fourth connecting bridge R4 can be limited in a smaller area range, so that the temperature changes of the first connecting bridge R1, the second connecting bridge R2, the third connecting bridge R3 and the fourth connecting bridge R4 are synchronous, thereby eliminating the influence of different deformation of the connecting bridges caused by temperature difference and further improving the precision of the output signal value.
In order to make the technical solution provided by the present embodiment more clear for those skilled in the art, the following will briefly describe the working principle of the pressure sensor:
referring to fig. 12 again, the first input terminal IN1 and the second input terminal IN2 apply electrical signals to the first connecting bridge R1, the second connecting bridge R2, the third connecting bridge R3 and the fourth connecting bridge R4, if the finger of the user does not press the array substrate, the pressure sensor satisfies the bridge balance condition and is IN a balanced state, and the signal value output between the first output terminal OUT1 and the second output terminal OUT2 is zero. When a finger of a user presses the array substrate, the array substrate deforms, the first connecting bridge R1 and the third connecting bridge R3 sense the strain in the second extending direction 200, and the resistance value of the first connecting bridge R1 and the third connecting bridge R3 changes accordingly, and the second connecting bridge R2 and the fourth connecting bridge R4 sense the strain in the first extending direction 100, and the resistance value of the first connecting bridge R4 changes accordingly. The strains in the first extending direction 100 and the second extending direction 200 are different, the resistance values of the first connecting bridge R1 and the second connecting bridge R2 are different, the resistance values of the third connecting bridge R3 and the fourth connecting bridge R4 are different, at this time, the pressure sensor does not satisfy the bridge balance condition, the bridge balance is lost, the signal value output between the first output end OUT1 and the second output end OUT2 is not zero, and the magnitude of the pressure of the user pressing the array substrate can be calculated according to the signal value after the signal value is read. In addition, the measurement of the magnitude of the touch pressure can be specifically used for operations such as touch, release, drag and drop, and the like.
The output value of the pressure sensor, that is, the output value of the signal detection circuit may be a current value or a voltage value.
In another embodiment, as shown in fig. 9, the pressure sensors according to the present embodiment are all located in the non-display region 3 of the array substrate 1. In fig. 9, the filled region is a display region 2, and a non-display region 3 surrounding the display region 2. The pressure sensor is disposed in the non-display region, so that wiring between the pressure sensor and the bias voltage applying circuit or the signal detecting circuit is flexible, and display of pixels in the display region is not affected.
In another embodiment, as shown in FIG. 13, a cross-sectional view taken along line A-A' of FIG. 9 is provided in accordance with an embodiment of the present invention. In the cross-sectional view, the display region 2 includes, in order from bottom to top, a transparent substrate 16, a barrier layer 21, a buffer layer 15 provided on the barrier layer 21, an active layer 22, an insulating layer 14 provided on the active layer, a gate electrode 26, an interlayer insulating layer 13 provided on the gate electrode 26, a source electrode 23, a drain electrode provided on the same layer as the source electrode, a planarization layer 12 provided on the layer, a common electrode 24, and an insulating layer 11 provided on the common electrode 24, and a pixel electrode 25. Similarly, IN the non-display region 3, the pressure sensor is located at the same layer as the active layer 22 of the thin film transistor of the array substrate, and the first input terminal IN1 and the first input terminal OUT1 of the pressure sensor are located at the same layer as the source 23. In the preparation process, the film layers for vapor deposition are reduced, so that the process steps are saved, and the efficiency of preparing the pressure sensor is effectively improved.
Fig. 14 is a schematic structural diagram of a touch display panel according to an embodiment of the invention. The touch display panel further comprises a touch display panel, wherein the touch display panel comprises an array substrate 27 and a color film substrate 28 which are arranged oppositely, and a liquid crystal layer 29 located between the array substrate 27 and the color film substrate 28.
Fig. 15 is a diagram illustrating a display device according to an embodiment of the present invention. The display device 500 includes the array substrate 1. It should be noted that fig. 15 exemplifies a mobile phone as an example of the display device, but the display device is not limited to the mobile phone, and specifically, the display device may include, but is not limited to, any electronic device having a display function, such as a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a tablet Computer (tablet Computer), an MP4 player, or a television.
In this embodiment, when the touch display panel is pressed with the same force, since the bias voltage value of the pressure sensor (the pressure sensor far from the center of the touch display panel) that is greatly influenced by the sealant is greater than the bias voltage value of the pressure sensor (the pressure sensor near the center of the touch display panel) that is less influenced by the sealant, the output signal value of the pressure sensor that is greatly influenced by the sealant is close to the output signal value of the pressure sensor that is less influenced by the sealant, and therefore, the sensitivity of the pressure sensor far from the center of the touch display panel is close to the sensitivity of the pressure sensor near the center of the touch display panel. That is, the present embodiment can effectively improve the sensitivity of the pressure sensor at a position away from the center of the touch display panel.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. An array substrate, characterized in that the array substrate comprises a bias voltage applying circuit and a plurality of pressure sensors arranged along a first extending direction of the array substrate;
the bias voltage applying circuit is respectively electrically connected with the pressure sensors and is used for applying bias voltage to the pressure sensors;
the bias voltage value of the pressure sensor is positively correlated with the distance from the pressure sensor to the central point of the array substrate;
the array substrate comprises at least one bias voltage applying circuit, one bias voltage applying circuit applies bias voltages to a plurality of pressure sensors, the bias voltage applying circuit comprises a power supply, switches are arranged between the power supply in the bias voltage applying circuit and the pressure sensors corresponding to the same bias voltage applying circuit, the power supply applies voltages to different pressure sensors in a time sharing mode and outputs corresponding signal values, and the voltage values applied to the corresponding pressure sensors by the power supply are different.
2. The array substrate of claim 1, wherein the pressure sensor comprises a first connection end, a second connection end, a third connection end and a fourth connection end;
the bias voltage applying circuit comprises a first input end and a second input end;
the array substrate further comprises a signal detection circuit, wherein the signal detection circuit is used for detecting an output signal of the pressure sensor and comprises a first output end and a second output end;
the first connecting end is electrically connected with the first input end, and the third connecting end is electrically connected with the second input end;
the second connecting end is electrically connected with the second output end, and the fourth connecting end is electrically connected with the first output end.
3. The array substrate of claim 2, wherein the pressure sensors are in a quadrilateral structure, and four sides of the quadrilateral structure correspond to four connecting ends one by one.
4. The array substrate of claim 2, wherein an extension line of the first connection end of the pressure sensor intersects with the first extending direction at an angle in a range of greater than 10 degrees and less than 80 degrees.
5. The array substrate of claim 4, wherein the intersecting angle is 45 degrees.
6. The array substrate according to claim 1, wherein the pressure sensor comprises a first connecting bridge, a second connecting bridge, a third connecting bridge and a fourth connecting bridge which are connected end to end in sequence;
the bias voltage applying circuit comprises a first input end and a second input end;
the array substrate further comprises a signal detection circuit, wherein the signal detection circuit is used for detecting an output signal of the pressure sensor and comprises a first output end and a second output end;
the first end of the first connecting bridge is electrically connected with the first input end, and the first end of the third connecting bridge is electrically connected with the second input end; the second end of the first connecting bridge is electrically connected with the first output end, and the second end of the second connecting bridge is electrically connected with the second output end;
the component of the length of the first connecting bridge arm in the first extending direction is smaller than the component of the length of the first connecting bridge arm in the second extending direction of the array substrate; the component of the length of the second connecting bridge arm in the first extending direction is larger than the component in the second extending direction; the component of the length of the third connecting bridge arm in the first extending direction is smaller than the component in the second extending direction; the length of the fourth connecting bridge arm has a component in the first direction of extension that is greater than a component in the second direction of extension.
7. The array substrate of claim 6, wherein the legs of the first connecting bridge and the third connecting bridge are parallel to the second extending direction of the array substrate, and the legs of the second connecting bridge and the fourth connecting bridge are parallel to the first extending direction of the array substrate;
the first extending direction is perpendicular to the second extending direction.
8. The array substrate of claim 6, wherein the first connecting bridge, the second connecting bridge, the third connecting bridge and the fourth connecting bridge have the same reference resistance.
9. The array substrate of claim 8, wherein at least one of the first connecting bridge, the second connecting bridge, the third connecting bridge and the fourth connecting bridge is a zigzag structure.
10. The array substrate of any one of claims 1 to 9, wherein the pressure sensor is located in a non-display area of the array substrate.
11. The array substrate of claim 2 or 6, wherein the pressure sensor is located on the same layer as an active layer of the thin film transistor of the array substrate.
12. A touch display panel, comprising the array substrate according to any one of claims 1 to 11, a color filter substrate disposed opposite to the array substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate.
13. A display device, characterized in that the display device comprises the touch display panel according to claim 12.
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| CN108153075B (en) * | 2018-01-04 | 2020-08-07 | 厦门天马微电子有限公司 | Display panel and display device |
| CN108151930B (en) * | 2018-03-06 | 2024-06-07 | 苏州敏芯微电子技术股份有限公司 | Pressure detection device and pressure detection touch device |
| CN113342204B (en) * | 2021-06-11 | 2024-02-27 | 瀚瑞微电子科技(深圳)有限公司 | Touch control system adapting method, device, equipment, storage medium and program product |
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