CN107562284B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107562284B CN107562284B CN201711001810.9A CN201711001810A CN107562284B CN 107562284 B CN107562284 B CN 107562284B CN 201711001810 A CN201711001810 A CN 201711001810A CN 107562284 B CN107562284 B CN 107562284B
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Abstract
The embodiment of the invention discloses a display panel and a display device. The display panel includes: a substrate base plate; at least two pressure sensors formed on the substrate base plate; the pressure sensor comprises a first power signal input end; a first connecting wire and a plurality of second connecting wires; the first connecting wire and the plurality of second connecting wires are positioned on different layers; the first end of each second connecting lead is electrically connected with the first power signal input end of one pressure sensor; the first connecting wires are respectively and electrically connected with the bias voltage supply end and the second end of each second connecting wire; the difference of the resistance values of any two second connecting wires is smaller than a preset value. The display panel provided by the embodiment of the invention can ensure that the pressure detection precision of each pressure sensor is consistent in the same display panel, so that the display panel has better pressure detection performance.
Description
Technical Field
The present invention relates to a touch pressure detection technology, and in particular, to a display panel and a display device.
Background
At present, display panels are widely used in electronic devices such as mobile phones, tablet computers, intelligent wearable devices, and information query machines in public halls. Therefore, the user can operate the electronic equipment by touching the mark on the electronic equipment with fingers, dependence of the user on other input equipment (such as a keyboard, a mouse and the like) is eliminated, and man-machine interaction is simpler.
In order to better meet the user requirement, a pressure sensor for detecting the magnitude of touch pressure when a user touches the display panel is generally disposed in the display panel to enrich the application range of the touch technology. At present, in order to make the display panel have a better touch pressure detection effect, a plurality of pressure sensors are often disposed at different positions in the display panel. Tests show that at present, the pressure detection precision of each pressure sensor arranged in the same display panel is different, and the pressure detection performance of the display panel is poor.
Disclosure of Invention
The invention provides a display panel and a display device, aiming to realize the purpose of enabling the pressure detection precision of each pressure sensor to be consistent in the same display panel and improving the pressure detection performance of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate base plate;
at least two pressure sensors formed on the substrate base plate; the pressure sensor comprises a first power signal input;
a first connecting wire and a plurality of second connecting wires; the first connecting wire and the plurality of second connecting wires are located at different layers;
a first end of each second connecting lead is electrically connected with the first power signal input end of one pressure sensor;
the first connecting wires are respectively and electrically connected with a bias voltage supply end and the second end of each second connecting wire;
and the difference between the resistance values of any two second connecting wires is smaller than a preset value.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes any one of the display panels provided in the embodiments of the present invention.
According to the embodiment of the invention, the display panel comprises the first connecting wire and the second connecting wires, the first end of each second connecting wire is electrically connected with the first power signal input end of one pressure sensor, the first connecting wire is electrically connected with the bias voltage supply end and the second end of each second connecting wire respectively, and the difference between the resistances of any two second connecting wires is smaller than the preset value, so that the problem that the touch pressure detection effect of the display panel is poor due to different pressure detection precisions of the pressure sensors in the existing display panel is solved, the pressure detection precisions of the pressure sensors in the same display panel tend to be consistent, and the purpose of improving the pressure detection performance of the display panel is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional display panel;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view A1-A2 in FIG. 2;
FIG. 4 is an equivalent circuit diagram of the circuit configuration of FIG. 2;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of K1-K2 shown in FIG. 8;
fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 11 is a schematic sectional view taken along line N1-N2 in FIG. 10;
fig. 12 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 13 is a schematic sectional view taken along line Q1-Q2 in FIG. 12;
fig. 14 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention;
FIG. 18 is a schematic structural diagram of another pressure sensor provided in accordance with an embodiment of the present invention;
FIG. 19 is an equivalent circuit diagram of the pressure sensor of FIG. 18;
fig. 20 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a conventional display panel. Referring to fig. 1, the display panel includes a substrate base plate 10, two pressure sensors (a pressure sensor 13a and a pressure sensor 13b, respectively) formed on the substrate base plate 10, and a driving chip 20. The pressure sensor 13a is electrically connected to the bias voltage supply terminal 21 of the driving chip 20 through a connection wire 14a, and the pressure sensor 13b is electrically connected to the bias voltage supply terminal 21 of the driving chip 20 through a connection wire 14 b. When performing touch pressure detection, the driver chip 20 inputs a bias voltage signal to the pressure sensor 13a through the connection wire 14a, and inputs a bias voltage signal to the pressure sensor 13b through the connection wire 14 b.
With continued reference to fig. 1, since the distance d1 from the driving chip 20 of the pressure sensor 13a is smaller than the distance d2 from the driving chip 20 of the pressure sensor 13b, the effective length of signal transmission of the connection wire 14a is shorter than that of the connection wire 14b, i.e., the length of the connection wire 14a is shorter than that of the connection wire 14 b.
According to the formula
Where L2 is the effective length of the connecting wire for signal transmission, S2 is the cross-sectional area of the connecting wire perpendicular to the current flow direction, and ρ 2 is the resistivity of the connecting wire. On the premise that the resistivity ρ 2 of the connecting wire and the cross-sectional area S2 of the connecting wire perpendicular to the current flowing direction are constant, the resistance value R2 of the connecting wire is in direct proportion to the effective signal transmission length L2 of the connecting wire.
Let the bias voltage actually received by the pressure sensor be U1, the resistance value of the pressure sensor be R1, the voltage on the connecting lead be U2, the resistance value of the connecting lead be R2, the bias voltage output by the driving chip be U, the current flowing on the connecting lead be I, and then there is a bias voltage that is actually received by the pressure sensor, the resistance value of the pressure sensor is R1, the voltage on the connecting lead is U2, the resistance
U＝U1+U2＝(R1+R2)I
U1＝R1·I。
According to the above formula, on the premise that the resistance R1 of the pressure sensor is constant and the bias voltage U output by the driver chip is constant, the larger the resistance R2 of the connecting wire is, the smaller the current I flowing through the connecting wire is, the smaller the bias voltage U1 actually received by the pressure sensor is, and the larger the voltage U2 on the connecting wire is.
As can be seen from the above description, in the conventional display panel, the longer the connection wire is, the larger the resistance of the connection wire is, the larger the voltage U2 on the connection wire is, and the smaller the bias voltage U1 actually received by the pressure sensor connected to the connection wire is. That is, referring to fig. 1, the bias voltage actually received by the pressure sensor 13b is smaller than the bias voltage actually received by the pressure sensor 13 a.
Research shows that for the same touch pressure, the larger the bias voltage actually received by the pressure sensor is, the larger the pressure sensing signal quantity output by the pressure sensor is, the less the pressure sensing signal quantity output by the pressure sensor is easily submerged by noise, and the higher the touch pressure detection precision of the pressure sensor is. Obviously, in the conventional display panel, since the bias voltages actually received by the pressure sensors are different, the touch pressure detection accuracy of the pressure sensors is different, which may affect the touch pressure detection performance of the display panel.
In view of the above, an embodiment of the invention provides a display panel. Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of A1-A2 shown in FIG. 2. Referring to fig. 2 and 3, the display panel includes: a base substrate 10; at least two pressure sensors (exemplarily including 6 pressure sensors, respectively, pressure sensor 13-1, pressure sensor 13-2, pressure sensor 13-3, pressure sensor 13-4, pressure sensor 13-5, and pressure sensor 13-6, in FIG. 2) formed on the substrate base plate 10; the pressure sensor includes a first power signal input Vin 1; a first connecting wire 11 and a plurality of second connecting wires (exemplarily including 6 second connecting wires in fig. 2, respectively, second connecting wire 12-1, second connecting wire 12-2, second connecting wire 12-3, second connecting wire 12-4, second connecting wire 12-5, and second connecting wire 12-6); the first connecting wire 11 and the plurality of second connecting wires are located at different layers; the first end of each second connecting lead is electrically connected with a first power signal input end Vin1 of one pressure sensor; the first connecting wires 11 are electrically connected with the bias voltage supply end 21 and the second end of each second connecting wire respectively; the difference of the resistance values of any two second connecting wires is smaller than a preset value.
In the drawings of the present specification, the first connecting wire 11 and the second connecting wire are distinguished for clarity. In all the drawings of the present application, the first connecting wire 11 is indicated by a dotted line, and the second connecting wire is indicated by a solid line. Specifically, with continued reference to fig. 2, the first connecting wire 11 is a dashed line between the connection point O and the bias voltage supply terminal 21. The second connecting wire 12-1 is a solid line connecting the first power signal input terminal Vin1 of the pressure sensor 13-1 with point O, the second connecting wire 12-2 is a solid line connecting the first power signal input terminal Vin1 of the pressure sensor 13-2 with point O, the second connecting wire 12-3 is a solid line connecting the first power signal input terminal Vin1 of the pressure sensor 13-3 with point O, the second connecting wire 12-4 is a solid line connecting the first power signal input terminal Vin1 of the pressure sensor 13-4 with point O, the second connecting wire 12-5 is a solid line connecting the first power signal input terminal Vin1 of the pressure sensor 13-5 with point O, and the second connecting wire 12-6 is a solid line connecting the first power signal input terminal Vin1 of the pressure sensor 13-6 with point O.
In the above technical solution, the bias voltage signal output by the bias voltage supply terminal 21 is input to the pressure sensor 13-1 after passing through the first connecting wire 11 and the second connecting wire 12-1; the bias voltage signal output by the bias voltage supply end 21 passes through the first connecting lead 11 and the second connecting lead 12-2 and then is input into the pressure sensor 13-2; the bias voltage signal output by the bias voltage supply end 21 passes through the first connecting lead 11 and the second connecting lead 12-3 and then is input into the pressure sensor 13-3; the bias voltage signal output by the bias voltage supply end 21 passes through the first connecting lead 11 and the second connecting lead 12-4 and then is input into the pressure sensor 13-4; the bias voltage signal output by the bias voltage supply end 21 passes through the first connecting lead 11 and the second connecting lead 12-5 and then is input into the pressure sensor 13-5; the bias voltage signal outputted from the bias voltage supply terminal 21 is inputted to the pressure sensor 13-6 via the first connecting wire 11 and the second connecting wire 12-6.
Optionally, the bias voltage supply terminal may be electrically connected to the driving chip, and may also be electrically connected to the flexible circuit board. In fig. 2, the bias voltage supply terminal 21 is electrically connected to the driving chip 20.
The first connecting wire 11 and each second connecting wire are equivalent to a resistor, and fig. 4 is an equivalent circuit diagram of the circuit structure in fig. 2. Referring to fig. 2 and 4, the circuit configuration includes six branches, the first branch is formed by connecting the pressure sensor 13-1 in series with the equivalent resistance R12-1 of the second connecting wire 12-1; the second branch is formed by connecting the pressure sensor 13-2 and the equivalent resistor R12-2 of the second connecting lead 12-2 in series; the third branch is formed by connecting the pressure sensor 13-3 and the equivalent resistor R12-3 of the second connecting lead 12-3 in series; the fourth branch is formed by connecting the pressure sensor 13-4 and the equivalent resistor R12-4 of the second connecting lead 12-4 in series; the fifth branch is formed by connecting the pressure sensor 13-5 and the equivalent resistor R12-5 of the second connecting lead 12-5 in series; the sixth branch is formed by the pressure sensor 13-6 in series with the equivalent resistance R12-6 of the second connecting lead 12-6. The six branches are connected in parallel and then connected in series with the equivalent resistance R11 of the first connecting lead 11.
As can be seen from the above circuit configuration, when the bias voltage supply terminal 21 outputs the bias voltage to each pressure sensor, the potential at the point O is constant, and the voltages in the six branches are equal to each other.
Any branch is taken as a research object, the bias voltage actually received by the pressure sensor on the branch is U1, the resistance value of the pressure sensor is R1, the voltage on the second connecting lead is U3, the resistance value of the second connecting lead is R3, and the total voltage on the branch is U30The current flowing in the branch is I0Then there is
U0＝U1+U3＝(R1+R3)I0
From the above equation and the basic knowledge of the circuit, the voltage U on each branch is known0And on the premise that the resistance values R1 of the pressure sensors are constant, if the resistance values R3 of the second connecting wires on the branches are equal, the bias voltages U1 actually received by the pressure sensors are the same.
The difference of resistance values of the two arbitrary second connecting wires is set to be less than the preset value in the technical scheme of the application, the fact is that the resistance values of the two arbitrary second connecting wires are set to be equal or tend to be equal, so that the bias voltage U1 actually received by each pressure sensor is the same or tends to be the same, the problem that the touch pressure detection effect of the display panel is poor due to the fact that the pressure detection precision of each pressure sensor is different in the existing display panel is solved, the purpose that the pressure detection precision of each pressure sensor tends to be consistent in the same display panel is achieved, and the purpose of the pressure detection performance of the display panel is improved.
Further, the difference between the resistance values of any two second connecting wires is set to be less than or equal to 1% of the resistance value of the second connecting wire with the largest resistance value. The arrangement can further promote the resistance values of the second connecting wires to be the same or tend to be the same, so that the pressure detection precision of each pressure sensor in the same display panel tends to be consistent, and the pressure detection performance of the display panel is improved. Typically, the resistance values of the second connecting wires are all equal. This ensures that the pressure detection accuracy of each pressure sensor is consistent in the same display panel.
According to the formula
Where R is the resistance of the resistor, ρ is the resistivity of the material from which the resistor is made, l is the length of the resistor in the direction of current flow (i.e., the effective length of signal transmission), and S is the cross-section of the resistor perpendicular to the direction of current flow. Root of herbaceous plantAccording to the above formula, when the difference between the resistance values of any two second connecting wires is actually set to be smaller than the preset value, the method can be realized by selecting appropriate materials to manufacture each second connecting wire, adjusting the effective length of signal transmission of each second connecting wire, adjusting the cross section of each second connecting wire perpendicular to the current flowing direction, and the like.
Further, according to the above formula, the resistance R of the resistor depends on the length l of the resistor in the current flowing direction on the premise that ρ and S are constant values. In the actual manufacturing process, for the sake of simplicity and convenience of the manufacturing process, the second connecting wires are usually made of the same material and formed in the same manufacturing process step. On the basis, the cross-sectional areas of the second connecting leads perpendicular to the current flowing direction are optionally set to be the same, and the signal transmission effective lengths of the second connecting leads are the same. The resistance values of the second connecting wires can be equal, the manufacturing difficulty of the second connecting wires is reduced, and the consistency of the pressure detection precision of the pressure sensors is facilitated.
There are various second connecting wire layout methods that satisfy the condition that the cross-sectional areas of the second connecting wires perpendicular to the current flow direction are the same and the effective lengths of the signal transmission of the second connecting wires are the same. The following is a detailed description of exemplary examples, but is not intended to limit the scope of the disclosure.
Fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Illustratively, as shown in FIG. 5, the second connection lead 12-1 connected to the pressure sensor 13-1 passes through the pressure sensor 13-1 first power signal input Vin1, point B, and point O. The second connection lead 12-2 connected to the pressure sensor 13-2 passes through the first power signal input Vin1 of the pressure sensor 13-2, point E, point D, and point O. The second connection lead 12-3, which is connected to the pressure sensor 13-3, passes through the pressure sensor 13-3 first power signal input Vin1, point C, and point O. The second connection lead 12-4, which is connected to the pressure sensor 13-4, passes through the first power signal input Vin1 of the pressure sensor 13-4, point B, and point O. The second connection lead 12-5 connected to the pressure sensor 13-5 passes through the pressure sensor 13-5 first power signal input Vin1, point G, point F, and point O. The second connection lead 12-6, which is connected to the pressure sensor 13-6, passes through the first power signal input Vin1 of the pressure sensor 13-6, point C, and point O. Wherein the second connecting wire 12-1 and the second connecting wire 12-4 have a part of the common connecting wire, and the common line segment is the line segment between the connecting point B and the point O. The second connecting wire 12-3 and the second connecting wire 12-6 have a partial common condition of the connecting wires, and the common line segment thereof is a line segment between the connection point C and the point O.
Fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 6, in the display panel, the second connection wire 12-1 to which the pressure sensor 13-1 is connected passes through the first power signal input Vin1 of the pressure sensor 13-1, a point H, a point L, and a point O. The second connection lead 12-2 connected to the pressure sensor 13-2 passes through the first power signal input Vin1 of the pressure sensor 13-2, point E, point D, point L, and point O. The second connection lead 12-3, which is connected to the pressure sensor 13-3, passes through the pressure sensor 13-3 first power signal input Vin1, point G, point L, and point O. A second connection lead 12-4 connected to pressure sensor 13-4 passes through a first power signal input Vin1 of pressure sensor 13-4, point I, point M, and point O. The second connection lead 12-5 connected to the pressure sensor 13-5 passes through the first power signal input Vin1 of the pressure sensor 13-5, point G, point F, point M, and point O. The second connection lead 12-6, which is connected to the pressure sensor 13-6, passes through the first power signal input Vin1 of the pressure sensor 13-6, point K, point M, and point O. Wherein, the second connecting lead 12-1, the second connecting lead 12-2 and the second connecting lead 12-3 have a common condition of partial connecting leads, and the common line segment is the line segment between the connecting point L and the point O. The second connecting wire 12-4, the second connecting wire 12-5 and the second connecting wire 12-6 have a part of the common connecting wire, and the common line segment is a line segment between the connecting point M and the point O.
Exemplarily, in fig. 2, 5 and 6, the first connection wire 11 passes through the bias voltage supply terminal 21 and the point O, and a projection of the first connection wire 11 on the substrate base may not coincide with a projection of the second connection wire on the substrate base. Fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention. The difference from fig. 2, 5 and 6 is that in fig. 7, the first connecting wire 11 passes through the bias voltage supply terminal 21, the point C and the point O. The projection of the first connecting wire 11 on the substrate coincides with the projection of the second connecting wire on the substrate, the repetition of which is the line between the points O and C.
Fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 8, in the display panel, a substrate base plate 10 includes a display region 31 and a non-display region 32 surrounding the display region 31; at least one scanning line 41 and at least one data line 42 are arranged in the display area; the scanning lines 41 and the data lines 42 intersect to define a plurality of pixel units 43; the second connecting wire 12 is disposed between two adjacent pixel units 43. Since the display panel does not emit light between the pixel units 43 (such as an organic light emitting display panel) or the light emitted between the pixel units 43 is blocked by the black matrix (such as a liquid crystal display panel), when displaying images, the display panel forms a display image only depending on the light emitted from the pixel units 43. by disposing the second connecting wires 12 between two adjacent pixel units 43, the second connecting wires 12 can not block the light for displaying images, and the display effect of the display panel is not affected.
Similarly, the first connecting wire may also be disposed between two adjacent pixel units to weaken the shielding effect of the first connecting wire on light for image display, and ensure that the display panel has a better display effect.
FIG. 9 is a schematic cross-sectional view of K1-K2 of FIG. 8. Referring to fig. 8 and 9, the display panel pixel unit 43 further includes a thin film transistor 44. The thin film transistor 44 includes: a gate electrode 441 disposed on the substrate base plate 1; a gate insulating layer 442 disposed on the gate electrode 441, an active layer 443 disposed on the gate insulating layer 442; a signal input terminal 444 and a signal output terminal 445 disposed on the active layer 443. The signal input terminal 444 of the thin film transistor 44 is electrically connected to the data line 42, the signal output terminal 445 of the thin film transistor 44 is electrically connected to the pixel electrode, and the gate 441 of the thin film transistor 44 is electrically connected to the scan line 41. A light-shielding layer 45 is further provided between the gate 441 of the thin film transistor 44 and the substrate 10. Since a photocurrent is generated when light emitted from the backlight module is irradiated onto the gate electrode, which affects the display effect of the display panel, the light emitted from the backlight module matched with the display panel can be shielded by disposing the light shielding layer 45 between the gate electrode 441 and the substrate 10, so as to improve the display effect of the display panel.
In actual manufacturing, two metal layers can be added in the display panel to form the first connecting wires and the second connecting wires respectively; the first connecting wires or the second connecting wires may be disposed in the same layer as the existing metal layer (scan line metal layer, data line metal layer or light shielding layer) of the display panel.
With continued reference to fig. 8 and 9, the display panel light-shielding layer 45 and the first insulating layer 46; the light shielding layer 45 is positioned between the base substrate 10 and the scanning line 41, and the first insulating layer 46 is positioned between the light shielding layer 45 and the scanning line 41; the second connecting wire 12 is provided in the same layer as the light-shielding layer 45. This arrangement is effective in reducing the thickness of the display panel, compared to a scheme in which the second connection wires 12 are formed by adding a metal layer in the display panel. In addition, when actually setting up, set up like this and can make second connecting wire 12 and light shield layer 45 form in same process step, need not to make the mask plate respectively to second connecting wire 12 and light shield layer 45, saved the cost, reduced process quantity, improved production efficiency.
Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention. FIG. 11 is a schematic sectional view taken along line N1-N2 in FIG. 10. Referring to fig. 10 and 11, the display panel further includes a first via hole 51; the first via 51 penetrates the first insulating layer 46; the second connecting wire 12 is electrically connected to any one of the scanning lines 41 through the first via hole 51; the scanning lines 41 electrically connected to the second connecting wires 12 are multiplexed into the first connecting wires 11. Compared with the scheme of forming the first connecting wire by adding the metal layer in the display panel, the scheme does not need to additionally arrange the first connecting wire, can effectively reduce the thickness of the display panel, saves the cost, reduces the number of processes and improves the production efficiency. It should be noted that, in actual use, the display panel includes a display stage and a touch pressure detection stage. In the display stage, the scan signal is transmitted to the scan line 41, and in the touch pressure detection stage, the bias voltage signal is transmitted to the scan line 41.
Further, the first via 51 may be located at any position of any scanning line 41 in the display panel, and optionally, the first via 51 is located at the geometric center of the substrate base plate 10; the scanning line 41 multiplexed as the first connecting wire 11 passes through the geometric center of the base substrate 10. The advantage of setting up like this is for the first via hole 51 all differs by a little from arbitrary pressure sensor's distance, has reserved sufficient space of laying for second connecting wire 12, has reduced the degree of difficulty of laying of second connecting wire 12 and display panel's the preparation degree of difficulty.
Fig. 12 is a schematic structural diagram of another display panel according to an embodiment of the present invention. FIG. 13 is a schematic sectional view taken along line Q1-Q2 in FIG. 12. Referring to fig. 12 and 13, the display panel further includes a second insulating layer 47 and a second via 52; a second insulating layer 47 (in fig. 13, the second insulating layer 47 includes a gate insulating layer 442) is located between the scan line 41 and the data line 42; the first connecting wire 11 and the data line 42 are arranged on the same layer; the second via 52 penetrates the first insulating layer 46 and the second insulating layer 47; the first connecting wire 11 is electrically connected to the second connecting wire 12 through the second via 52. This arrangement can effectively reduce the thickness of the display panel, compared to a scheme in which the first connection wires 11 are formed separately by adding a metal layer in the display panel. In addition, when actually setting up, the setting can make first connecting wire 11 and light shield layer 45 must form in same process step like this, need not to make the mask plate respectively to first connecting wire 11 and data line 42, has saved the cost, has reduced process quantity, has improved production efficiency.
With continued reference to fig. 12, the second via 52 is located within the non-display region 32 of the substrate base 10. The reason for this is that, in order to increase the aperture ratio of the display panel, the distance between two pixel units 43 is usually very small in the conventional display panel. If the second via hole 52 is forcibly disposed in the region between the two pixel units 43, the manufacturing difficulty of the display panel is increased, and a signal line (such as the scan line 42 or the data line 43) for performing image display is easily short-circuited or disconnected in the manufacturing process, so that the display panel cannot perform image display normally. By arranging the second via hole 52 in the non-display area 32 of the substrate base plate 10, the risk of short circuit or open circuit of the signal line for image display during manufacturing can be reduced, and the yield of the display panel can be improved.
Further, consider that when actually carrying out touch pressure detection, if pressure sensor is in operating condition for a long time, can make pressure sensor continuously generate heat, and then make pressure sensor and surrounding temperature rise, influence pressure sensor's pressure like this and detect the precision to can make other components and parts that set up around this pressure sensor can't normally work.
Fig. 14 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 14, the display panel further includes at least one control switch 60 and a control signal line 64; the control switch 60 includes a control terminal 61, a signal input terminal 62, and a signal output terminal 63; the signal input end 62 of the control switch 60 is electrically connected to the second connecting lead 12, the signal output end 63 of the control switch 60 is electrically connected to the first power signal input end Vin1 of the pressure sensor 13, and the control end 61 of the control switch 60 is electrically connected to the control signal line 64. By additionally arranging the control switch 60 between the second connecting wire 12 and the pressure sensor 13, the working state of the pressure sensor 13 can be controlled by controlling the on and off of the control switch 60, and the pressure sensor 13 can be prevented from continuously generating heat at the touch pressure detection stage to influence the performance of the pressure sensor and other components.
In actual installation, the control signal line 64 may be electrically connected to the driving chip 20, or may be electrically connected to other components, as long as the pressure sensor can be normally turned on at an appropriate time.
Fig. 15 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 15, the non-display 32 in the display panel includes a plurality of cascaded shift registers VSR; the control signal line 64 is electrically connected to a trigger signal output terminal (not shown in fig. 15) of any one of the shift registers VSR. When a trigger signal is output from a certain shift register VSR, the control switch 60 connected to the shift register VSR is turned on, so that the bias voltage signal output from the bias voltage output terminal 21 (not shown in fig. 15) can be transmitted to the pressure sensor 13 through the first connection wire 11 and the second connection wire 12, so that the pressure sensor 13 can perform touch pressure detection. When the shift register VSR stops outputting the trigger signal, the control switch 60 connected to the shift register VSR is turned off, so that the bias voltage signal outputted from the bias voltage output terminal 21 (not shown in fig. 15) cannot be transmitted to the pressure sensor 13, and the pressure sensor 13 cannot perform touch pressure detection. The operating time of the pressure sensor 13 and the scanning frequency and frame rate of the scanning lines (not shown in fig. 15) are thus the same, and the one-time scannable time is the charging time of one row of pixel cells. For example, for a 60Hz frame rate display panel, the pressure sensor 13 operates for approximately 2 microseconds.
Further, each pressure sensor may be electrically connected to its immediately adjacent shift register through a control signal line. Because a plurality of shift registers are often arranged in the existing display panel, each pressure sensor is electrically connected with the shift register adjacent to the pressure sensor through a control signal wire, the length of the control signal wire can be shortened, and the laying difficulty of the control signal wire is reduced.
With continued reference to fig. 15, any one of the pressure sensors 13 is provided in correspondence with at least two of the control switches 60 (in fig. 15, any one of the pressure sensors 13 is schematically provided in correspondence with two of the control switches 60); the control switches 60 corresponding to the same pressure sensor 13 are connected in parallel; the signal input end 62 of each control switch 60 corresponding to the same pressure sensor 60 is electrically connected to the same second connecting wire 12, the signal output end 63 of each control switch 60 corresponding to the same pressure sensor 13 is electrically connected to the first power signal input end Vin1 of the corresponding pressure sensor 13, and the control end 61 of each control switch 60 corresponding to the same pressure sensor 13 is electrically connected to the trigger signal output end of a different shift register VSR through a different control signal line 64.
Since the control terminal 61 of each control switch 60 is electrically connected to the trigger signal output terminal of a different shift register VSR through a different control signal line 64, if a certain pressure sensor 13 is connected to two different shift register pressure sensors through two control switches, respectively, any one pressure sensor 13 in the two shift register VSRs outputs a trigger signal, which will cause the pressure sensor 13 to be in a working state. This arrangement can extend the operating time of the pressure sensor 13.
In the actual touch process, it may happen that the frequency of use of some pressure sensors is high, and the time required to be turned on is long, while the frequency of use of some pressure sensors is low, and the time required to be turned on is short, and the technical scheme in fig. 15 provides possibility for meeting different working time requirements of the pressure sensors.
Fig. 16 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Further, referring to fig. 16, the display panel further includes a touch driving electrode 71, a touch sensing electrode 72, a touch driving trace 73, and a touch sensing trace 74; the touch driving electrode 71 and the touch sensing electrode 72 are arranged in an insulating manner; the touch driving trace 73 is electrically connected with the touch driving electrode 71, and the touch sensing trace 74 is electrically connected with the touch sensing electrode 72; the touch driving trace 73 is multiplexed as the control signal line 64. In this way, when the touch driving trace 73 transmits a touch driving signal, the control switch 60 connected to the touch driving trace 73 is turned on, so that the bias voltage signal output by the bias voltage output terminal 21 (not shown in fig. 16) can be transmitted to the pressure sensor 13 through the first connecting wire 11 (not shown in fig. 16) and the second connecting wire 12, so that the pressure sensor 13 performs touch pressure detection. When the touch driving trace 73 stops transmitting the touch driving signal, the control switch 60 connected to the touch driving trace 73 is turned off, so that the bias voltage signal output by the bias voltage output terminal 21 (not shown in fig. 16) cannot be transmitted to the pressure sensor 13, and the pressure sensor 13 cannot perform touch pressure detection. Therefore, the touch driving wire 73 can be used for controlling the on and off of the control switch 60 to control the working state of the pressure sensor 13, and the pressure sensor 13 can be prevented from continuously generating heat at the touch pressure detection stage to influence the performance of the pressure sensor and other components.
With continued reference to fig. 16, any one of the pressure sensors 13 is provided in correspondence with at least two of the control switches 60 (in fig. 16, for example, any one of the pressure sensors 13 is provided in correspondence with two of the control switches 60); the control switches 60 corresponding to the same pressure sensor 13 are connected in parallel; the signal input end 62 of each control switch 60 corresponding to the same pressure sensor 13 is electrically connected to the same second connecting wire 12, the signal output end 63 of each control switch 60 corresponding to the same pressure sensor 13 is electrically connected to the first power signal input end Vin1 of the corresponding pressure sensor 13, and the control end 61 of each control switch 60 corresponding to the same pressure sensor 13 is electrically connected to different touch driving traces 73.
Since the control end 61 of each control switch 60 is electrically connected to different touch driving traces 73 through different control signal lines 64, if a certain pressure sensor 13 is connected to two different touch driving traces 73 through two control switches 60, any one of the two touch driving traces 73 transmits a touch driving signal, which will cause the pressure sensor 13 to be in a working state. This arrangement can extend the operating time of the pressure sensor 13.
In the actual touch process, it may happen that the frequency of use of some pressure sensors is high, and the time required to be turned on is long, while the frequency of use of some pressure sensors is low, and the time required to be turned on is short, and the technical scheme in fig. 16 provides possibility for meeting different working time requirements of the pressure sensors.
The operation principle of the touch driving electrodes 71 and the touch sensing electrodes 72 for detecting the touch position will be briefly described. When detecting the touch position, a touch driving signal is sequentially input to each touch driving electrode 71, and a detection signal output from each touch sensing electrode 72 is received. Each touch driving electrode 71 and each touch sensing electrode 72 are coupled to form a capacitor. When a finger touches the display panel, the capacitance between the touched touch drive electrode 71 and the touch sense electrode 72 changes due to the influence of the finger. The change of the signal output by each touch sensing electrode 72 can reflect the capacitance change between the touch driving electrode 71 and the touch sensing electrode 72. By detecting the signal change condition of each touch sensing electrode 72, it is determined which touch driving electrode 71 and touch sensing electrode 72 with changed coupling capacitance is, and the touch position of the finger is determined.
In the above technical solutions, the control switch may be a thin film transistor or another module having a switching function. In the above embodiments, the pressure sensor 13 may be located in the non-display area 32 of the display panel, or may be located in the display area 31 of the display panel. Alternatively, as shown in fig. 16, the pressure sensor 13 is located in the non-display area 32 of the substrate base plate 10, which has an advantage that the pressure sensor 13 does not affect the aperture ratio of the display panel.
In the actual setting process, there are various setting schemes for the pressure sensors 13. The following is a detailed description of exemplary examples, but is not intended to limit the scope of the disclosure.
Fig. 17 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention. Referring to fig. 17, the pressure sensor 13 further includes a first resistor R5, a second resistor R6, a third resistor R7, a fourth resistor R8, a second power signal input terminal Vin2, a first sensing signal measuring terminal Vout1, and a second sensing signal measuring terminal Vout 2. A first end of the first resistor R5 and a first end of the fourth resistor R8 are electrically connected to the first power signal input terminal Vin1, a second end of the first resistor R5 and a first end of the second resistor R6 are electrically connected to the first sensing signal measurement terminal Vout1, a second end of the fourth resistor R8 and a first end of the third resistor R7 are electrically connected to the second sensing signal measurement terminal Vout2, and a second end of the second resistor R6 and a second end of the third resistor R7 are electrically connected to the second power signal input terminal Vin 2; the second power signal input terminal Vin2 is grounded; the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 are used to output a pressure sensing signal from the pressure sensor 13.
With continued reference to fig. 17, the first resistor R5, the second resistor R6, the third resistor R7, and the fourth resistor R8 form a wheatstone bridge configuration. When a bias voltage signal is input to the first power signal input terminal Vin1, current flows through each branch in the wheatstone bridge. At this time, when the display panel is pressed, the resistance values of the resistors (including the first resistor R5, the second resistor R6, the third resistor R7, and the fourth resistor R8) inside the pressure sensor 13 are changed by the shearing force from the corresponding position on the display panel, so that the pressure sensing signals output by the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 of the pressure sensor 13 are different from the pressure sensing signals output by the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 of the pressure sensor 13 when no pressure is applied, and thus, the magnitude of the touch pressure can be determined.
On this basis, optionally, in the non-pressed state, the ratio of the resistance value of the first resistor R5 to the resistance value of the second resistor R6 is set equal to the ratio of the resistance value of the fourth resistor R8 to the resistance value of the third resistor R7. This arrangement has an advantage that, when the bias voltage signal is applied to the pressure sensor 13 and the resistances of the first resistor R5, the second resistor R6, the third resistor R7 and the fourth resistor R8 satisfy the above relationship, the divided voltage at the first resistor R5 is the same as the divided voltage at the fourth resistor R8, and the divided voltage at the second resistor R6 is the same as the divided voltage at the third resistor R7. When there is no pressing, the voltage between the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 of the pressure sensor is equal, and the pressure sensing detection signal output by the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 is 0. When pressed, the pressure sensor 13 outputs a pressure detection signal equal to the amount of change in the pressure detection signal output by the pressure sensor 13 before and after the pressing. Therefore, the calculation process of the touch pressure value is simplified, and the response time of the display panel executing corresponding operation according to the touch pressure is shortened.
Fig. 18 is a schematic structural diagram of another pressure sensor according to an embodiment of the present invention. Referring to fig. 18, the pressure sensor 13 further includes a sensor body 130, a second power signal input terminal Vin2, a first sensing signal measuring terminal Vout1, and a second sensing signal measuring terminal Vout 2; the sensor body 130 is a semiconductor material; the sensor body 130 is a polygonal structure including at least four sides, including a first side 131 and a second side 132 which are not connected, and a third side 133 and a fourth side 132 which are not connected, wherein the first power signal input terminal Vin1 is located at the first side 131, the second power signal input terminal Vin2 is located at the second side 132, and the second power signal input terminal Vin2 is grounded; the first sensing signal measuring terminal Vout1 is located on the third side 133, and the second sensing signal measuring terminal Vout2 is located on the fourth side 134, for outputting a pressure sensing signal from the pressure sensor 13.
Fig. 19 is an equivalent circuit diagram of the pressure sensor of fig. 18. Referring to fig. 18 and 19, the pressure sensor 13 can be equivalent to a wheatstone bridge, which includes four equivalent resistors, namely, an equivalent resistor Ra, an equivalent resistor Rb, an equivalent resistor Rc and an equivalent resistor Rd, wherein the region between the second power signal input terminal Vin2 and the first sensing signal measurement terminal Vout1 is the equivalent resistor Ra, the region between the second power signal input terminal Vin2 and the second sensing signal measurement terminal Vout2 is the equivalent resistor Rb, the region between the first power signal input terminal Vin1 and the first sensing signal measurement terminal Vout1 is the equivalent resistor Rd, and the region between the first power signal input terminal Vin1 and the second sensing signal measurement terminal Vout2 is the equivalent resistor Rc. When a bias voltage signal is input to the first power signal input terminal Vin1, current flows through each branch in the wheatstone bridge. At this time, when the display panel is pressed, the pressure sensor 13 receives a shearing force from a position corresponding to the display panel, and the impedance of at least one of the internal equivalent resistance Ra, the equivalent resistance Rb, the equivalent resistance Rc, and the equivalent resistance Rd of the pressure sensor 13 changes, so that the pressure sensing signals output from the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 of the pressure sensor 13 are different from the pressure sensing signals output from the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 of the pressure sensor 13 when no pressure is applied, and thus, the magnitude of the touch pressure can be determined.
Alternatively, the sensor body 130 may be square in shape. The advantage of this arrangement is that it is beneficial to make the resistances of the equivalent resistor Ra, the equivalent resistor Rb, the equivalent resistor Rc and the equivalent resistor Rd the same, so that, under the condition of no pressing, the potentials between the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 are equal, and the pressure sensing signals output by the first sensing signal measuring terminal Vout1 and the second sensing signal measuring terminal Vout2 are 0, which is beneficial to simplifying the calculation process of the pressure value and improving the sensitivity of the pressure sensing.
The embodiment of the invention also provides a display device. Fig. 20 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 20, the display device 101 includes any one of the display panels 201 provided in the embodiments of the present invention, and the display device 101 may be a mobile phone, a tablet computer, a smart wearable device, and the like.
In the embodiment of the invention, the difference between the resistance values of any two second connecting wires is set to be smaller than the preset value, and the resistance values of any two second connecting wires are substantially equal or tend to be equal, so that the bias voltages U1 actually received by the pressure sensors are the same or tend to be the same, the problem that the touch pressure detection effect of the display panel is poor due to different pressure detection precisions of the pressure sensors in the conventional display panel is solved, the pressure detection precisions of the pressure sensors in the same display panel tend to be consistent, and the purpose of improving the pressure detection performance of the display panel is achieved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (19)
1. A display panel, comprising:
a substrate base plate;
at least two pressure sensors formed on the substrate base plate; the pressure sensor comprises a first power signal input;
a first connecting wire and a plurality of second connecting wires; the first connecting wire and the plurality of second connecting wires are located at different layers;
a first end of each second connecting lead is electrically connected with the first power signal input end of one pressure sensor;
the first connecting wires are respectively and electrically connected with a bias voltage supply end and the second end of each second connecting wire;
the resistance values of any two second connecting wires are equal or tend to be equal.
2. The display panel according to claim 1,
the difference between the resistance values of any two second connecting wires is less than or equal to 1% of the resistance value of the second connecting wire with the largest resistance value.
3. The display panel according to claim 1,
the resistance values of the second connecting wires are equal.
4. The display panel according to claim 3,
the cross section area of each second connecting wire perpendicular to the current flowing direction is the same, and the effective signal transmission length of each second connecting wire is the same.
5. The display panel according to claim 1,
the pressure sensor also comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a second power signal input end, a first induction signal measuring end and a second induction signal measuring end;
a first end of the first resistor and a first end of the fourth resistor are electrically connected with the first power signal input end, a second end of the first resistor and a first end of the second resistor are electrically connected with the first sensing signal measuring end, a second end of the fourth resistor and a first end of the third resistor are electrically connected with the second sensing signal measuring end, and a second end of the second resistor and a second end of the third resistor are electrically connected with the second power signal input end;
the second power supply signal input end is grounded; the first sensing signal measuring end and the second sensing signal measuring end are used for outputting pressure sensing detection signals from the pressure sensor.
6. The display panel according to claim 1,
the pressure sensor also comprises a sensor main body, a second power signal input end, a first induction signal measuring end and a second induction signal measuring end;
the sensor main body is made of semiconductor materials; the sensor main body is of a polygonal structure comprising at least four sides, and comprises a first side, a second side and a third side, wherein the first side and the second side are not connected with each other, the third side and the fourth side are not connected with each other, the first power supply signal input end is positioned on the first side, the second power supply signal input end is positioned on the second side, and the second power supply signal input end is grounded; the first sensing signal measuring end is located on the third side, and the second sensing signal measuring end is located on the fourth side and used for outputting a pressure sensing detection signal from the pressure sensor.
7. The display panel according to claim 1,
the substrate comprises a display area and a non-display area surrounding the display area; at least one scanning line and at least one data line are arranged in the display area; the scanning lines and the data lines are crossed to define a plurality of pixel units;
the second connecting lead is arranged between two adjacent pixel units.
8. The display panel according to claim 7, further comprising a light-shielding layer and a first insulating layer;
the light shielding layer is positioned between the substrate and the scanning line,
the first insulating layer is positioned between the shading layer and the scanning lines;
the second connecting lead and the shading layer are arranged on the same layer.
9. The display panel according to claim 8, further comprising a first via;
the first via hole penetrates through the first insulating layer;
the second connecting lead is electrically connected with any one scanning line through the first via hole;
the scanning lines electrically connected to the second connecting wires are multiplexed into the first connecting wires.
10. The display panel according to claim 9,
the first via is located at a geometric center of the substrate base plate;
the scan lines multiplexed as the first connecting wires pass through the geometric center of the substrate base plate.
11. The display panel according to claim 8, further comprising a second insulating layer and a second via hole;
the second insulating layer is positioned between the scanning line and the data line;
the first connecting wire and the data wire are arranged on the same layer;
the second via hole penetrates through the first insulating layer and the second insulating layer;
the first connecting lead is electrically connected with the second connecting lead through the second via hole.
12. The display panel according to claim 11,
the second via hole is located in a non-display area of the substrate base plate.
13. The display panel according to claim 7, further comprising at least one control switch and a control signal line;
the control switch comprises a control end, a signal input end and a signal output end;
the signal input end of the control switch is electrically connected with the second connecting wire, the signal output end of the control switch is electrically connected with the first power supply signal input end of the pressure sensor, and the control end of the control switch is connected with the control signal wire.
14. The display panel according to claim 13,
the non-display area comprises a plurality of cascaded shift registers;
the control signal line is electrically connected with a trigger signal output end of any one of the shift registers.
15. The display panel according to claim 14, wherein any one of the pressure sensors is provided in correspondence with at least two control switches;
the control switches corresponding to the same pressure sensor are connected in parallel;
the signal input end of each control switch corresponding to the same pressure sensor is electrically connected with the same second connecting lead, the signal output end of each control switch corresponding to the same pressure sensor is electrically connected with the first power signal input end of the corresponding pressure sensor, and the control end of each control switch corresponding to the same pressure sensor is electrically connected with the trigger signal output end of different shift registers through different control signal lines.
16. The display panel of claim 13, further comprising touch driving electrodes, touch sensing electrodes, touch driving traces, and touch sensing traces;
the touch driving electrode and the touch sensing electrode are arranged in an insulating way;
the touch driving wire is electrically connected with the touch driving electrode, and the touch sensing wire is electrically connected with the touch sensing electrode;
and the touch drive routing is multiplexed into the control signal line.
17. The display panel according to claim 16, wherein any one of the pressure sensors is provided in correspondence with at least two control switches;
the control switches corresponding to the same pressure sensor are connected in parallel;
the signal input end of each control switch corresponding to the same pressure sensor is electrically connected with the same second connecting wire, the signal output end of each control switch corresponding to the same pressure sensor is electrically connected with the first power signal input end of the corresponding pressure sensor, and the control end of each control switch corresponding to the same pressure sensor is electrically connected with different touch driving wires.
18. The display panel according to claim 7, wherein the pressure sensor is located in a non-display region of the substrate base plate.
19. A display device characterized by comprising the display panel according to any one of claims 1 to 18.
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| CN108445663B (en) * | 2018-03-12 | 2021-08-24 | 厦门天马微电子有限公司 | Display panel and display device |
| CN108768372B (en) * | 2018-05-04 | 2022-04-22 | 京东方科技集团股份有限公司 | Key circuit, printed circuit board and display device |
| CN110571321B (en) * | 2018-06-05 | 2021-10-08 | 群创光电股份有限公司 | Electronic device |
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| JP6480837B2 (en) * | 2015-09-04 | 2019-03-13 | 株式会社東芝 | Sensor, information terminal, microphone, blood pressure sensor, and touch panel |
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| CN107092118A (en) * | 2017-06-30 | 2017-08-25 | 上海天马微电子有限公司 | A kind of array base palte, display panel and display device |
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