CN107861654B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107861654B CN107861654B CN201711021361.4A CN201711021361A CN107861654B CN 107861654 B CN107861654 B CN 107861654B CN 201711021361 A CN201711021361 A CN 201711021361A CN 107861654 B CN107861654 B CN 107861654B
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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
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
Abstract
The invention discloses a display panel and a display device. The display panel includes: a substrate base plate; at least one pressure sensor group formed on the substrate base plate; in the same pressure sensor group, a first sensing signal measuring end of a first pressure sensor and a first sensing signal measuring end of a second pressure sensor are respectively and electrically connected with different input ends of a first-class adder; a second sensing signal measuring end of the first pressure sensor and a second sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the second type adder; the output end of the first type adder and the output end of the second type adder are used for outputting pressure sensing detection signals of the pressure sensor group. The display panel provided by the embodiment of the invention realizes the effects of increasing the pressure sensing detection signal output by the pressure sensor and improving the pressure sensing detection performance of the display panel.
Description
Technical Field
The present invention relates to touch display technologies, 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, information query machines in halls of public places, and the like. 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 also generally disposed in the display panel, so as to enrich the application range of the touch technology. However, in the conventional display panel, the pressure-sensitive detection signal output by the pressure sensor is too small and easily submerged in noise, so that the pressure-sensitive detection performance of the display panel is not good.
Disclosure of Invention
The invention provides a display panel and a display device, aiming to increase a pressure sensing detection signal output by a pressure sensor and improve the pressure sensing 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;
the pressure sensor group comprises a first pressure sensor, a second pressure sensor, a first type adder and a second type adder, and the first pressure sensor and the second pressure sensor both comprise sensor bodies and a first induction signal measuring end and a second induction signal measuring end which are connected with the sensor bodies;
the first-class adder and the second-class adder both comprise a plurality of input ends and an output end;
in the same pressure sensor group, the first sensing signal measuring end of the first pressure sensor and the first sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the first-class adder; the second sensing signal measuring end of the first pressure sensor and the second sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the second type adder;
and the output end of the first-class adder and the output end of the second-class adder are used for outputting pressure sensing detection signals of the pressure sensor group.
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.
In the embodiment of the invention, a first sensing signal measuring end of a first pressure sensor and a first sensing signal measuring end of a second pressure sensor are arranged in the same pressure sensor group and are respectively and electrically connected with different input ends of a first-class adder; a second sensing signal measuring end of the first pressure sensor and a second sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the second type adder; the output end of the first type of adder and the output end of the second type of adder are used for outputting pressure sensing detection signals of the pressure sensor group, the problem that the pressure sensing detection performance of a display panel is poor due to the fact that the pressure sensing detection signals output by the pressure sensors are too small and are easily submerged by noise in an existing display panel is solved, and the purposes of increasing the pressure sensing detection signals output by the pressure sensors and improving the pressure sensing detection performance of the display panel are 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 taken along line A-A' of FIG. 2;
FIG. 4 is a schematic structural diagram of another pressure sensor group provided in the embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view taken along line B-B' of FIG. 4;
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 pressure sensor group according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another pressure sensor group according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention;
FIG. 13 is a schematic structural diagram of another pressure sensor provided in accordance with an embodiment of the present invention;
FIG. 14 is a schematic structural diagram of another pressure sensor group provided in the embodiment of the present invention;
fig. 15 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, and referring to fig. 1, the display panel includes: a base substrate 20; two pressure sensors 12 are formed on the substrate base plate 20, and the pressure sensors 12 include a sensor body 110 and a first sensing signal measuring terminal 111 and a second sensing signal measuring terminal 112 connected to the sensor body 110. The voltage output by the first sensing signal measuring terminal 111 is Vo21The voltage output from the second sensing signal measuring terminal 112 is Vo22. When the position C on the display panel is pressed, the pressure sensor 12 receives a shearing force from the position C on the display panel, and the absolute value of the difference between the electric signals output by the first sensing signal measuring terminal 111 and the second sensing signal measuring terminal 112 is Δ Vo1＝|Vo21-Vo22The absolute value of the difference between | (i.e., the pressure-sensitive detection signal) and the electric signals output from the first and second sensing signal measuring terminals 111 and 112 of the pressure sensor 12 in the absence of pressing is different. Accordingly, the magnitude of the touch pressure on the display panel can be determined.
As described in the background, the pressure-sensitive detection signal Δ Vo output by the pressure sensor in the conventional display panel1Too small to be easily submerged by noise, rendering it impossible to rely on the pressure sensing signal Δ Vo1And determining the magnitude of touch pressure on the display panel, so that the pressure detection performance of the display panel is poor.
In view of the above, the present invention provides a display panel, and fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention. Referring to fig. 2, the display panel includes: a base substrate 20; at least one pressure sensor group 10 (exemplarily comprising one pressure sensor group in fig. 2) formed on the substrate base plate 20, the pressure sensor group 10 comprising a first pressure sensor 13, a second pressure sensor 14, a first-type adder 16 and a second-type adder 17, the first pressure sensor being a pressure sensor of the first typeThe sensor 13 and the second pressure sensor 14 each include a sensor body 110, and a first sensing signal measuring terminal 111 and a second sensing signal measuring terminal 112 connected to the sensor body 110; the adders 16 of the first type and 17 of the second type each comprise a plurality of inputs 116 (the adders 16 of the first type and 17 of the second type in fig. 2 each illustratively comprise two inputs 116) and an output 119; in the same pressure sensor group 10, the first sensing signal measuring end 111 of the first pressure sensor 13 and the first sensing signal measuring end 111 of the second pressure sensor 14 are electrically connected to different input ends 116 of the first-type adder 16, respectively; the second sensing signal measuring end 112 of the first pressure sensor 13 and the second sensing signal measuring end 112 of the second pressure sensor 14 are electrically connected with different input ends 116 of the second type adder 17 respectively; the output 119 of the first adder 16 and the output 119 of the second adder 17 are used for outputting the pressure sensing detection signal Δ Vo of the pressure sensor group2. When touch pressure detection is performed, the pressure detection signal Δ Vo of the pressure sensor group 10 before and after pressing is used2And the variation can determine the magnitude of the touch pressure on the display panel.
With continued reference to fig. 2, the first type of adder 16 and the second type of adder 17 may be addition circuits in an analog circuit, the output voltage of which is equal to the sum of the respective input voltages, thereby enabling the addition of multiple input signals. Specifically, if the first sensing signal measuring terminal 111 of the first pressure sensor 13 outputs the voltage Vo31The output voltage of the second sensing signal measuring terminal 112 of the first pressure sensor 13 is Vo32The output voltage of the first sensing signal measuring terminal 111 of the second pressure sensor 14 is Vo41The second sensing signal measuring terminal 112 of the second pressure sensor 14 outputs a voltage Vo42The first adder 16 of the first type adds the voltage Vo output from the first sensing signal measuring terminal 111 of the first pressure sensor 1331And the voltage Vo output from the first sensing signal measuring terminal 111 of the second pressure sensor 1441Adding the voltages Vo output by the output 119 of the adder 16 of the first type6＝Vo31+Vo41. Similarly, the output 119 of the adder 17 of the second typeVoltage Vo7Equal to the voltage Vo output from the second sensing signal measuring terminal 112 of the first pressure sensor 1332And the voltage Vo output from the second sensing signal measuring terminal 112 of the second pressure sensor 1442Sum, i.e. Vo7＝Vo32+Vo42. Therefore, the pressure-sensing detection signal Δ Vo output from the pressure sensor group 102＝|Vo6-Vo7|＝|(Vo31+Vo41)-(Vo32+Vo42) I, |, through deformation, can get Δ Vo2＝|(Vo31–Vo32)+(Vo41-Vo42)|。
The absolute value of the difference between the electric signals respectively output from the first and second sensing signal measuring terminals 111 and 112 of the first pressure sensor 13 is Δ Vo11＝|(Vo31–Vo32) I, the absolute value of the difference between the electric signals respectively output from the first and second sensing signal measuring terminals 111 and 112 of the second pressure sensor 14 is Δ Vo12＝|(Vo41-Vo42) I, the pressure sensing detection signal output by the pressure sensor group 10 is Δ Vo2＝ΔVo11+ΔVo12. That is, the pressure-sensitive measurement Δ Vo output by the pressure sensor group 102Equal to the pressure-sensitive detection signal Δ Vo output from the first pressure sensor 1311And the pressure-sensitive detection signal Δ Vo output from the second pressure sensor 1412And (4) summing.
In the pressure sensor group 10, the first pressure sensor 13 and the second pressure sensor 14 are the same type of pressure sensors as the pressure sensor 12 shown in fig. 1, and the pressure detection signal output from the pressure sensor group 10 corresponds to the sum of the pressure detection signal output from the first pressure sensor 13 and the pressure detection signal output from the second pressure sensor 14. Obviously, the present application provides that the pressure sensor group outputs a greater pressure sensing signal than the pressure sensor in fig. 1.
Therefore, in the embodiment of the present invention, in the same pressure sensor 10 group, the first sensing signal measuring end 111 of the first pressure sensor 13 and the first sensing signal measuring end 111 of the second pressure sensor 14 are respectively and electrically connected to different input ends 116 of the first type adder 16; the second sensing signal measuring end 112 of the first pressure sensor 13 and the second sensing signal measuring end 112 of the second pressure sensor 14 are electrically connected with different input ends 116 of the second type adder 17 respectively; the output end 119 of the first-type adder 16 and the output end 119 of the second-type adder 17 are used for outputting the pressure sensing detection signals of the pressure sensor group 10, so that the problem that the pressure sensing detection performance of the display panel is poor due to the fact that the pressure sensing detection signals output by the pressure sensors are too small and are easily submerged by noise in the existing display panel is solved, and the effects of increasing the pressure sensing detection signals output by the pressure sensors and improving the pressure sensing detection performance of the display panel are achieved.
In the conventional display panel, in order to enable the pressure-sensitive detection signal transmitted by the pressure sensor to be output, two signal output lines need to be provided for each pressure sensor. Illustratively, two pressure sensors 12 are included in fig. 1, and a signal output line 51 and a signal output line 52 are provided for each pressure sensor 12. The display panel includes 4 signal output lines in total.
Referring to fig. 2, in order to enable the output of the signals transmitted by the pressure sensor groups, two signal output lines need to be configured for each pressure sensor group. Illustratively, in FIG. 2, 2 signal output lines, signal output line 53 and signal output line 54, respectively, are configured for the pressure sensor group. Comparing fig. 1 and 2, it can be seen that the technical solution of fig. 2 comprises the same number of pressure sensors as in fig. 1, but the technical solution of fig. 2 requires a significantly reduced number of signal output lines.
The display panel often includes a large number of components to realize functions such as image display, touch position detection, fingerprint identification, and the like. This can make the area of the display panel available for routing pressure sensors very narrow. In addition, in the actual setting process, the situation that signals transmitted by the signal lines interfere with signals transmitted by other signal lines needs to be considered, and the more signal output lines required by the pressure sensor, the greater the difficulty in arranging the pressure sensor. Compared with the existing display panel, the display panel has the advantages that the number of the signal output lines required by the display panel is small, the laying difficulty of the pressure sensors and the signal lines of the pressure sensors in the display panel can be reduced, and the display panel is consistent with the development trend of narrow frame.
In addition, the pressure sensor group 10 is configured to include more than one pressure sensor, so that when one pressure sensor fails, other pressure sensors can be continuously used, and the fault tolerance of the display panel for detecting the touch pressure is enhanced.
Fig. 3 is a schematic cross-sectional view along a-a' in fig. 2, referring to fig. 2 and 3, based on the above technical solution, optionally, the first pressure sensor 13 and the second pressure sensor 14 are located in the same membrane layer in the same pressure sensor group 10; the first pressure sensor 13 and the second pressure sensor 14 are disposed at a distance from each other. The first pressure sensor 13 and the second pressure sensor 14 are arranged in the same film layer, the thickness of the display panel can be reduced, only one etching process is needed in the manufacturing process, the mask plates do not need to be manufactured for the first pressure sensor 13 and the second pressure sensor 14 respectively, the cost is saved, the manufacturing process quantity is reduced, and the production efficiency is improved.
With continued reference to fig. 3, optionally, a signal line 122 is provided in electrical connection with the second sensing signal measuring terminal 112 of the first pressure sensor 13; the signal line 121 is electrically connected to the first sensing signal measuring terminal 111 of the first pressure sensor 13; the signal line 124 is electrically connected to the second sensing signal measuring terminal 112 of the second pressure sensor 14; the signal line 123 is electrically connected to the first sensing signal measuring terminal 111 of the second pressure sensor 14. The signal line 122, the signal line 121, the signal line 124, and the signal line 123 are located in the same film layer. Similarly, the signal line 122, the signal line 121, the signal line 124 and the signal line 123 are arranged in the same film layer, so that the thickness of the display panel can be reduced, only one etching process is needed in the manufacturing process, no mask plate needs to be manufactured on the signal line 122, the signal line 121, the signal line 124 and the signal line 123 respectively, the cost is saved, the number of manufacturing processes is reduced, and the production efficiency is improved.
Fig. 4 is a schematic structural diagram of another pressure sensor group according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram taken along a section B-B' in fig. 4. Referring to fig. 4 and 5, optionally, within the same pressure sensor group 10, the first pressure sensor 13 and the second pressure sensor 14 are located in different membrane layers; an insulating layer 30 is arranged between the first pressure sensor 13 and the second pressure sensor 14; the first pressure sensor 13 is located on the side of the insulating layer 30 facing away from the substrate base plate 20; the second pressure sensor 14 is located between the insulating layer 30 and the base substrate 20. Because a plurality of components are often arranged in the display panel, the horizontal space which can be used for arranging the pressure sensor group in the display panel is very limited, so that the fact that the horizontal space which needs to be occupied by the pressure sensor group is replaced by the three-dimensional space is reduced, and the arrangement difficulty of the pressure sensor group 10 is reduced.
On the basis of the above technical solution, optionally, as shown in fig. 5, in the same pressure sensor group 10, the vertical projection of the first pressure sensor 13 on the substrate base plate 20 is located in the vertical projection of the second pressure sensor 14 on the substrate base plate 20; or the vertical projection of the first pressure sensor 13 on the substrate base plate 20 is overlapped with the vertical projection of the second pressure sensor 14 on the substrate base plate 20; alternatively, fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 6, a vertical projection of the second pressure sensor 14 on the substrate base plate 20 is located within a vertical projection of the first pressure sensor 13 on the substrate base plate 20.
With reference to fig. 5, since the first pressure sensor 13 exposes the edge of the second pressure sensor 14, when the first via hole 50 is used to electrically connect the signal line 124 with the second sensing signal measuring terminal 112 of the second pressure sensor 14, the integrity of the first pressure sensor 13 is not damaged, and similarly, when the first via hole 50 is used to electrically connect the signal line 123 with the first sensing signal measuring terminal 111 of the second pressure sensor 14, the integrity of the first pressure sensor 13 is not damaged, and the pressure sensing detection performance of the first pressure sensor 13 is not affected.
In the above technical solutions, there are many ways to arrange the first type adder 16 and the second type adder 17, and the following describes several typical adder structures, but the present application is not limited thereto. Optionally, the first type of adder 16 and the second type of adder 17 are both in-phase adders or inverting adders.
Fig. 7 is a schematic structural diagram of another pressure sensor group according to an embodiment of the present invention, referring to fig. 7, optionally, the first-type adder 16 and the second-type adder 17 are both inverting adders; the inverting adder includes a first resistor R1, at least two second resistors R2 (in fig. 7, the first-type adder 16 and the second-type adder 17 each include two second resistors R2 for example), and an operational amplifier a 1; the resistance value of the first resistor R1 is equal to the resistance value of the second resistor R2; in the inverting adder, the second end of each second resistor R2 is electrically connected to the inverting input terminal a11 of the operational amplifier a1 and the first end of the first resistor R1, the inverting input terminal a12 of the operational amplifier a1 is grounded, the output terminal a13 of the operational amplifier a1 is electrically connected to the first end of the first resistor R1, the first ends of the second resistors R2 are both the input terminals 116 of the inverting adder, and the second end of the first resistor R1 is the output terminal 119 of the inverting adder.
According to the working principle of the inverting adder, the output voltage Vo of the adder 16 of the first kind can be obtained6Comprises the following steps:
similarly, the output voltage Vo of the adder 17 of the second type7Comprises the following steps:
in conjunction with the foregoing analysis, it can be found that the pressure-sensitive detection signal Δ Vo of the pressure sensor group 102Comprises the following steps:
since the resistances of the first resistor R1 and the second resistor R2 are equal, Δ Vo can be obtained2＝|(Vo31-Vo32)+(Vo41-Vo42) L. The pressure-sensitive detection signal output by the pressure sensor is over-small and easily submerged by noise, so that the problem of poor pressure-sensitive detection performance of the display panel is solved, the pressure-sensitive detection signal output by the pressure sensor is increased, and the effect of improving the pressure-sensitive detection performance of the display panel is improved.
Since in practice a certain voltage division exists on the connecting leads for connecting the first resistor R1, the second resistor R2 and the operational amplifier a1 to form an adder, in practice the Δ Vo output by the adder 16 of the first type or the adder 17 of the second type2Tend to be less than (Vo)31-Vo32)+(Vo41-Vo42) L. Therefore, optionally, in the above-mentioned technical solution, in the first-type adder 16 and the second-type adder 17, the resistance value of the first resistor R1 is 10 times or more of the resistance value of the sensor main body. What is provided in this way is to substantially reduce the voltage division on the connection wires for connecting the first resistor R1, the second resistor R2 and the operational amplifier a1 to form the adder, to ensure the voltage value Vo of the output of the adder 16 of the first kind6Is an input voltage Vo31And Vo41The sum, and the output voltage value Vo of the adder 17 of the second type7Is an input voltage Vo32And Vo42And the sum of the voltage and the current, so that the display panel has higher pressure detection performance.
Fig. 8 is a schematic structural diagram of another pressure sensor group according to an embodiment of the present invention, referring to fig. 8, optionally, the first-type adder 16 and the second-type adder 17 are both in-phase adders; the non-inverting adder includes at least one third resistor R3 (in fig. 8, the first-type adder 16 and the second-type adder 17 each include two third resistors R3), a fourth resistor R4, a fifth resistor R5, and an operational amplifier a 2; the resistance value of the third resistor R3, the resistance value of the fourth resistor R4 and the resistance value of the fifth resistor R5 are all equal; in the non-inverting adder, an inverting input end A21 of an operational amplifier A2 is connected with a first end of a fourth resistor R4 and a first end of a fifth resistor R5, a second end of the fourth resistor R4 is grounded, and a second end of the fifth resistor R5 is electrically connected with an output end A23 of the operational amplifier A2; a second end of each third resistor R3 is electrically connected with the positive input end A22 of the operational amplifier A2; the first end of each third resistor R3 is the input terminal 116 of the non-inverting adder, and the output terminal a23 of the operational amplifier a2 is the output terminal 119 of the non-inverting adder.
The output voltage Vo of the adder 16 of the first kind can be obtained according to the working principle of the in-phase adder6Comprises the following steps:
similarly, the output voltage Vo of the adder 17 of the second type7Comprises the following steps:
in conjunction with the foregoing analysis, it can be found that the pressure-sensitive detection signal Δ Vo of the pressure sensor group 102Comprises the following steps:
since the resistance of the third resistor R3, the resistance of the fourth resistor R4 and the resistance of the fifth resistor R5 are all equal, Δ Vo can be obtained2＝|(Vo31-Vo32)+(Vo41-Vo42) L. The pressure-sensitive detection signal output by the pressure sensor is over-small and easily submerged by noise, so that the problem of poor pressure-sensitive detection performance of the display panel is solved, the pressure-sensitive detection signal output by the pressure sensor is increased, and the effect of improving the pressure-sensitive detection performance of the display panel is improved.
Similarly, in the above technical solution, optionally, in the first-type adder 16 and the second-type adder 17, the resistance value of the third resistor R3 is more than 10 times the resistance value of the sensor main body. What is essential in this arrangement is to reduce the voltage division on the connecting wires for connecting the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the operational amplifier a2 to form an adder to ensure the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the operational amplifier a2Voltage value Vo of output of the class adder 166Is an input voltage Vo31And Vo41The sum, and the output voltage value Vo of the adder 17 of the second type7Is an input voltage Vo32And Vo42And the sum of the voltage and the current, so that the display panel has higher pressure detection performance.
Fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 9, on the basis of the foregoing technical solutions, optionally, a substrate 20 is provided, which includes a display area 21 and a non-display area 22 surrounding the display area 21; the pressure sensor group 10 is located in the non-display area 22. By disposing the pressure sensor group 10 in the non-display area 22, the influence of the pressure sensors on the aperture ratio of the display panel can be avoided.
Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 10, on the basis of the foregoing technical solutions, optionally, the display panel further includes N third pressure sensors 15, M-stage third-type adders 18, and M-stage fourth-type adders 19; at least part of the pressure sensor group 10, at least part of the third pressure sensor 15, at least part of the adder 18 of the third type and at least part of the adder 19 of the fourth type are located on the same side of the display area (not shown in the figures); the third pressure sensor 15 includes a sensor body 110, and a first sensing signal measuring terminal 111 and a second sensing signal measuring terminal 112 connected to the sensor body 110; the adders 18 and 19 of the third and fourth types each comprise a plurality of inputs 116 (the adders 18 and 19 of the third and fourth types in fig. 10 illustratively comprise two inputs 116) and an output 119; along the first direction 100, the P-1 st-stage first-type signal output end and the P-stage first-type signal output end are both electrically connected with different input ends 116 of the P-stage third-type adder 18, and along the first direction 100, the P-1 st-stage second-type signal output end and the P-stage second-type signal output end are both electrically connected with different input ends 116 of the P-stage fourth-type adder 19. Wherein M and P are positive integers, P is more than or equal to 1 and less than or equal to M, and N is more than or equal to 1 and less than or equal to M.
In practical arrangement, the P-th-stage first-type signal output terminal is the output terminal 119 of the first-type adder 16 of the pressure sensor group 10, the first sensing signal measuring terminal 111 of the third pressure sensor 15, or the output terminal 119 of the P-th-stage third-type adder 18. Illustratively in fig. 10, the P-th stage first type signal output terminal is the output terminal 119 of the P-th stage third type adder 18.
Similarly, in practical implementation, the P-th-stage second-type signal output terminal is the output terminal 119 of the second-type adder 17 of the pressure sensor group 10, the second sensing signal measuring terminal 112 of the third pressure sensor 15, or the output terminal 119 of the P-th-stage fourth-type adder 19, and in fig. 10, the P-th-stage second-type signal output terminal is the output terminal 119 of the P-th-stage fourth-type adder 19.
From the foregoing analysis, the output voltage of the summing circuit is equal to the sum of the input voltages, and with continued reference to FIG. 10, the output voltage Vo at the output 119 of the P-th stage third class adder 188PThe voltage Vo output by the P-1 stage first type signal output terminal 1198P-1And the voltage Vo output from the P-th signal output terminal 11151PAnd (c) the sum, i.e.:
Vo8P＝Vo8P-1+Vo51P
and so on:
Vo8P＝Vo31+Vo41+…+Vo51p-1+Vo51p。
the pressure sensor group shown in fig. 10 then comprises M third pressure sensors 15, which output the voltages Vo of the output terminals of the signals of the first type8MIs the output voltage Vo of the first sensing signal measuring terminal 111 of the first pressure sensor 1331An output voltage Vo of the first sensing signal measuring terminal 111 of the second pressure sensor 1441… …, output voltage Vo of first sensing signal measuring terminal 111 of third pressure sensor 15 of P-1 stage51P-1And the output voltage Vo of the first sensing signal measuring terminal 111 of the P-th stage third pressure sensor 1551P… …, the output voltage Vo of the first sensing signal measuring terminal 111 of the mth stage third pressure sensor 1551MAnd (4) summing.
Similarly, the voltage Vo at the output end of the second type signal output by the pressure sensor group shown in fig. 109MIs a second one of the first pressure sensor 13Output voltage Vo of the sensing signal measuring terminal 11232An output voltage Vo of the second sensing signal measuring terminal 112 of the second pressure sensor 1442… …, and the output voltage Vo of the second sensing signal measuring terminal 112 of the P-1 stage third pressure sensor 1552P-1And the output voltage Vo of the second sensing signal measuring terminal 112 of the P-th stage third pressure sensor 1552P… …, and the output voltage Vo of the second sensing signal measuring terminal 112 of the mth stage third pressure sensor 1552MAnd (4) summing.
Obviously, such an arrangement can further increase the pressure-sensitive detection signal output by the pressure sensor, and improve the pressure-sensitive detection performance of the display panel. In addition, the arrangement is favorable for reducing the number of signal output lines connected with the pressure sensor, and the laying difficulty of the pressure sensor is reduced.
It should be noted that the number of the third pressure sensors, the number of the pressure sensor groups, and the arrangement order of the third pressure sensors and the pressure sensor groups included in the display panel are not limited in the present application.
Exemplarily, fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 11, on the basis of the foregoing technical solutions, optionally, the display panel further includes a third pressure sensor 15, a two-stage third-type adder 18, and a two-stage fourth-type adder 19; the third pressure sensor 15 includes a sensor body 110, and a first sensing signal measuring terminal 111 and a second sensing signal measuring terminal 112 connected to the sensor body 110; the adders 18 and 19 of the third and fourth types each comprise two inputs 116 and one output 119; in the first direction 100, the output 119 of the 1 st-stage third-type adder 18 and the output 119 of the 2 nd-stage first-type adder 16 are electrically connected to different inputs 116 of the 2 nd-stage third-type adder 18, and in the first direction 100, the output 119 of the 1 st-stage fourth-type adder 18 and the output 119 of the 2 nd-stage second-type adder 16 are electrically connected to different inputs 116 of the 2 nd-stage fourth-type adder 19.
Similar to the previous analysis, the output voltage of the addition circuit is equal to the sum of the input voltages, 2 nd stage, second stageOutput voltage Vo of output 119 of class three adder 1882Is the output voltage Vo of the first sensing signal measuring terminal 111 of the 0 th-stage first pressure sensor 1331An output voltage Vo of the first sensing signal measuring terminal 111 of the second pressure sensor 1441Output voltage Vo of first sensing signal measuring terminal 111 of the 1 st stage third pressure sensor 15511And the output voltage Vo of the first sensing signal measuring terminal 111 of the 2 nd stage first pressure sensor 13312An output voltage Vo of the first sensing signal measuring terminal 111 of the second pressure sensor 14412And (4) summing. Similarly, the output voltage Vo at the output 119 of the adder 19 of the fourth class of stage 292Is the output voltage Vo of the second sensing signal measuring terminal 112 of the 0 th-stage first pressure sensor 1332An output voltage Vo of the second sensing signal measuring terminal 112 of the second pressure sensor 1442Output voltage Vo of the second sensing signal measuring terminal 112 of the 1 st stage third pressure sensor 15521And the output voltage Vo of the second sensing signal measuring terminal 112 of the 2 nd stage first pressure sensor 13322An output voltage Vo of the second sensing signal measuring terminal 112 of the second pressure sensor 14422And (4) summing.
This arrangement can further increase the pressure-sensitive detection signal output by the pressure sensor, and improve the pressure-sensitive detection performance of the display panel. In addition, the arrangement is favorable for reducing the number of signal output lines connected with the pressure sensor, and the laying difficulty of the pressure sensor is reduced.
In each of the above solutions, each of the first pressure sensor 13 and the second pressure sensor 14 further includes a first power signal input terminal and a second power signal input terminal connected to the sensor body 110. The pressure sensors may be arranged in various ways, and the following description will be made about the structures of several typical pressure sensors, but the present application is not limited thereto.
Optionally, fig. 12 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention. Referring to fig. 12, the sensor body 110 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; a first end of the sixth resistor R6 and a first end of the ninth resistor R9 are electrically connected to the first power signal input terminal 113, a second end of the sixth resistor R6 and a first end of the seventh resistor R7 are electrically connected to the first sensing signal measuring terminal 111, a second end of the ninth resistor R9 and a first end of the eighth resistor R8 are electrically connected to the second sensing signal measuring terminal 112, and a second end of the seventh resistor R7 and a second end of the eighth resistor R8 are electrically connected to the second power signal input terminal 112; the first and second power signal input terminals 111 and 112 are used to input a bias voltage signal to the sensor body 110.
The sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 form a wheatstone bridge configuration. When a bias voltage signal is input to the first power signal input terminal 113 and the second power signal input terminal 114, current flows through each branch in the wheatstone bridge. At this time, when the display panel including the pressure sensor is pressed, the pressure sensor receives a shearing force from a position corresponding to the pressure sensor on the display panel, and the resistances of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are changed, so that the absolute value of the difference between the electric signals output from the first sensing signal measuring terminal 111 and the second sensing signal measuring terminal 112 of the pressure sensor (i.e., the pressure detection signal) is different from the absolute value of the difference between the electric signals output from the first sensing signal measuring terminal 111 and the second sensing signal measuring terminal 112 of the pressure sensor when no pressure is applied, and thus, the magnitude of the touch pressure can be determined.
Fig. 13 is a schematic structural diagram of another pressure sensor according to an embodiment of the present invention. Referring to fig. 13, each of the first pressure sensor 13 and the second pressure sensor 14 further includes a first power signal input terminal 113 and a second power signal input terminal 114 connected to the sensor body 110; the sensor body 110 is a semiconductor material; the sensor body 110 is a polygonal structure including at least four sides, including a first side 120 and a second side 130 which are not connected, and a third side 140 and a fourth side 150 which are not connected, wherein the first power signal input terminal 113 is located at the first side 120, and the second power signal input terminal 114 is located at the second side 130, and is used for inputting a bias voltage signal to the sensor body 110; the first sensing signal measuring terminal 111 is located on the third side 140, and the second sensing signal measuring terminal 112 is located on the fourth side 150. The pressure sensor shown in fig. 13 may be equivalent to a wheatstone bridge circuit formed by the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 in fig. 12, and the principle of pressure detection is the same as that of the pressure sensor shown in fig. 12, and will not be described again here.
Fig. 14 is a schematic structural diagram of another pressure sensor group according to an embodiment of the present invention, and referring to fig. 14, on the basis of the above solutions, in the same pressure sensor group 10, the first power signal input terminal 113 of the first pressure sensor 13 is electrically connected to the first power signal input terminal 113 of the second pressure sensor 14; within the same pressure sensor group 10, the second power signal input 114 of the first pressure sensor 13 and the second power signal input 114 of the second pressure sensor 14 are electrically connected. This arrangement makes it possible to keep the input power supply signals of the first pressure sensor 13 and the second pressure sensor 14 the same, and also makes it possible to further reduce the number of signal input lines electrically connected to the first pressure sensor 13 and the second pressure sensor 14, as compared with the existing display panel. The layout difficulty of the pressure sensor and the signal line thereof in the display panel can be reduced, and the layout difficulty is consistent with the development trend of narrow frame.
The embodiment of the invention also provides a display device. Fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 15, 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.
The display device provided by the embodiment of the invention is arranged in the same pressure sensor group, and the first sensing signal measuring end of the first pressure sensor and the first sensing signal measuring end of the second pressure sensor are arranged in the same pressure sensor group and are respectively and electrically connected with different input ends of the first-class adder; a second sensing signal measuring end of the first pressure sensor and a second sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the second type adder; the output end of the first type adder and the output end of the second type adder are used for outputting pressure sensing detection signals of the pressure sensor group. The problem of among the current display panel, because the pressure that pressure sensor output detects the signal undersize, easily submerged by the noise, cause display panel's pressure to sense the not good performance is solved, realized the pressure that increases pressure sensor output and sensed the signal, improved display panel's pressure and sensed the performance is detected the effect. In addition, because the number of signal output lines required by the application is less, the difficulty in arranging the pressure sensors and the signal lines of the pressure sensors in the display panel can be reduced, and the arrangement trend of the pressure sensors is consistent with the development trend of narrow frame, and the pressure sensor group is arranged to comprise more than one pressure sensor, so that when one pressure sensor breaks down, other pressure sensors can be continuously used, and the fault tolerance of the display panel for detecting the touch pressure is enhanced.
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 changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (14)
1. A display panel, comprising:
a substrate base plate;
the pressure sensor group comprises a first pressure sensor, a second pressure sensor, a first type adder and a second type adder, and the first pressure sensor and the second pressure sensor both comprise sensor bodies and a first induction signal measuring end and a second induction signal measuring end which are connected with the sensor bodies;
the first-class adder and the second-class adder both comprise a plurality of input ends and an output end;
in the same pressure sensor group, the first sensing signal measuring end of the first pressure sensor and the first sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the first-class adder; the second sensing signal measuring end of the first pressure sensor and the second sensing signal measuring end of the second pressure sensor are respectively and electrically connected with different input ends of the second type adder;
the output end of the first-class adder and the output end of the second-class adder are used for outputting pressure sensing detection signals of the pressure sensor group;
within the same pressure sensor group, the first pressure sensor and the second pressure sensor are located in different membrane layers;
an insulating layer is arranged between the first pressure sensor and the second pressure sensor;
the first pressure sensor is positioned on one side, away from the substrate, of the insulating layer;
the second pressure sensor is located between the insulating layer and the substrate base plate.
2. The display panel according to claim 1,
in the same pressure sensor group, the vertical projection of the first pressure sensor on the substrate base plate is positioned in the vertical projection of the second pressure sensor on the substrate base plate.
3. The display panel of claim 1, wherein the first type of adder and the second type of adder are both in-phase adders or inverting adders.
4. The display panel of claim 3, wherein the first type of adder and the second type of adder are inverting adders;
the inverting adder comprises a first resistor, at least two second resistors and an operational amplifier;
the resistance value of the first resistor is equal to the resistance value of the second resistor;
the second end of each second resistor in the inverting adder is electrically connected with the inverting input end of the operational amplifier and the first end of the first resistor, the homodromous input end of the operational amplifier is grounded, the output end of the operational amplifier is electrically connected with the first end of the first resistor, the first ends of the second resistors are the input ends of the inverting adder, and the second end of the first resistor is the output end of the inverting adder.
5. The display panel according to claim 4, wherein the first resistor has a resistance value 10 times or more that of the sensor main body in both the first type adder and the second type adder.
6. The display panel of claim 3, wherein the first type of adder and the second type of adder are in-phase adders;
the in-phase adder comprises at least two third resistors, a fourth resistor, a fifth resistor and an operational amplifier;
the resistance value of the third resistor, the resistance value of the fourth resistor and the resistance value of the fifth resistor are equal;
in the non-inverting adder, the inverting input end of the operational amplifier is connected to both the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is grounded, and the second end of the fifth resistor is electrically connected to the output end of the operational amplifier; a second end of each third resistor is electrically connected with a positive input end of the operational amplifier; the first end of each third resistor is the input end of the in-phase adder, and the output end of the operational amplifier is the output end of the in-phase adder.
7. The display panel according to claim 6,
in the first-type adder and the second-type adder, the resistance value of the third resistor is more than 10 times of the resistance value of the sensor main body.
8. The display panel according to claim 1,
the substrate comprises a display area and a non-display area surrounding the display area;
the pressure sensor group is located in the non-display area.
9. The display panel of claim 8, further comprising N third pressure sensors, M stages of adders of a third kind, and M stages of adders of a fourth kind;
at least part of the group of pressure sensors, at least part of the third pressure sensor, at least part of the adder of the third type and at least part of the adder of the fourth type are located on the same side of the display area;
the third pressure sensor comprises a sensor main body, a first induction signal measuring end and a second induction signal measuring end, wherein the first induction signal measuring end and the second induction signal measuring end are connected with the sensor main body;
the adders of the third kind and the adders of the fourth kind each comprise a plurality of input ends and an output end;
along a first direction, the P-1 th-stage first-class signal output end and the P-stage first-class signal output end are electrically connected with different input ends of the P-stage third-class adder; the first class signal output end of the P level is the output end of the first class adder of the pressure sensor group, the first sensing signal measuring end of a third pressure sensor or the output end of the third class adder of the P level;
along the first direction, the P-1 th-stage second-class signal output end and the P-stage second-class signal output end are electrically connected with different input ends of the P-stage fourth-class adder; the second class signal output end of the P level is the output end of the second class adder of the pressure sensor group, the second sensing signal measuring end of a third pressure sensor or the output end of the fourth class adder of the P level;
wherein N, M and P are positive integers, P is more than or equal to 1 and less than or equal to M, and N is more than or equal to 1 and less than or equal to M.
10. The display panel according to claim 9,
the first type of adder, the second type of adder, the third type of adder and the fourth type of adder are all in-phase adders or anti-phase adders.
11. The display panel of claim 1, wherein the first pressure sensor and the second pressure sensor each further comprise a first power signal input and a second power signal input connected to the sensor body;
the sensor body comprises a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor;
a first end of the sixth resistor and a first end of the ninth resistor are electrically connected to the first power signal input terminal, a second end of the sixth resistor and a first end of the seventh resistor are electrically connected to the first sensing signal measuring terminal, a second end of the ninth resistor and a first end of the eighth resistor are electrically connected to the second sensing signal measuring terminal, and a second end of the seventh resistor and a second end of the eighth resistor are electrically connected to the second power signal input terminal;
the first power signal input terminal and the second power signal input terminal are used for inputting bias voltage signals to the sensor body.
12. The display panel of claim 1, wherein the first pressure sensor and the second pressure sensor each further comprise a first power signal input and a second power signal input connected to the sensor body;
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, and the second power supply signal input end is positioned on the second side and is used for inputting bias voltage signals to the sensor main body; 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.
13. The display panel according to claim 11 or 12,
in the same pressure sensor group, the first power signal input end of the first pressure sensor is electrically connected with the first power signal input end of the second pressure sensor;
in the same pressure sensor group, the second power signal input end of the first pressure sensor is electrically connected with the second power signal input end of the second pressure sensor.
14. A display device comprising the display panel of any one of claims 1-13.
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| CN103885628A (en) * | 2012-12-20 | 2014-06-25 | 三星显示有限公司 | Method Of Sensing A Touch And Touch Sensing System |
| CN106687907A (en) * | 2014-07-02 | 2017-05-17 | 3M创新有限公司 | Touch systems and methods including rejection of unintentional touch signals |
| CN107092120A (en) * | 2017-06-30 | 2017-08-25 | 上海天马微电子有限公司 | Array base palte, display panel and display device |
| CN107221537A (en) * | 2017-06-30 | 2017-09-29 | 上海天马微电子有限公司 | A kind of array base palte, display panel, display device and array substrate manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8633916B2 (en) * | 2009-12-10 | 2014-01-21 | Apple, Inc. | Touch pad with force sensors and actuator feedback |
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|---|---|---|---|---|
| CN103885628A (en) * | 2012-12-20 | 2014-06-25 | 三星显示有限公司 | Method Of Sensing A Touch And Touch Sensing System |
| CN106687907A (en) * | 2014-07-02 | 2017-05-17 | 3M创新有限公司 | Touch systems and methods including rejection of unintentional touch signals |
| CN107092120A (en) * | 2017-06-30 | 2017-08-25 | 上海天马微电子有限公司 | Array base palte, display panel and display device |
| CN107221537A (en) * | 2017-06-30 | 2017-09-29 | 上海天马微电子有限公司 | A kind of array base palte, display panel, display device and array substrate manufacturing method |
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