CN108426659B - Pressure sensor detection circuit and display panel - Google Patents
Pressure sensor detection circuit and display panel Download PDFInfo
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- CN108426659B CN108426659B CN201810005086.5A CN201810005086A CN108426659B CN 108426659 B CN108426659 B CN 108426659B CN 201810005086 A CN201810005086 A CN 201810005086A CN 108426659 B CN108426659 B CN 108426659B
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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
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
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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
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
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Abstract
The invention discloses a pressure sensor detection circuit and a display panel. The pressure sensor detection circuit includes: a pressure sensor; a demultiplexing module; at least one data line divided into a first portion and a second portion; the first control circuit comprises a first control end, a first receiving end and a first output end; and the second control circuit comprises a second control end, a second receiving end and a second output end, wherein the first part of the data line is electrically connected with the second output end, and the second part of the data line is electrically connected with the second receiving end. The pressure sensor detection circuit controls the on-off of the data line by controlling the on-off of the second output end and the second receiving end, so that the on-off states of the data line of the output signal of the pressure sensor in different normal and abnormal states are different, and the fault of the pressure sensor can be detected by the display picture in the VT test stage.
Description
Technical Field
The invention relates to the technical field of pressure sensor detection, in particular to a pressure sensor detection circuit and a display panel.
Background
The pressure sensors commonly used on the display panel at present mainly comprise a capacitance type pressure sensor and a strain type pressure sensor. The strain gauge pressure sensing probe senses and calculates pressure by detecting a change in resistance of the measuring sensor caused by deformation of the display panel due to the pressure. As shown in fig. 1 below, fig. 1 is an equivalent circuit of a conventional strain gauge pressure sensor, a bias power supply voltage is applied to a first input terminal 101 and a second input terminal 102, a bridge is balanced by setting values of a first sense resistor r1, a second sense resistor r2, a third sense resistor r3 and a fourth sense resistor r4 when there is no pressure, that is, a potential of a first sensor output terminal 103 is equal to a potential of a second sensor output terminal 104, and a detection circuit 105 measures changes of the potentials of the first sensor output terminal 103 and the second sensor output terminal 104 after a force is applied to a display panel to obtain corresponding pressure values.
In the prior art of the above structure, the pressure sensor needs to be assembled with an integrated circuit ic (integrated circuit), a flexible Printed circuit (fpc) (flexible Printed circuit) and other components at a module stage to form a complete pressure sensing detection circuit before testing whether the pressure sensor works normally, and at this time, if the pressure sensor fails and needs to be replaced, the pressure sensor will be damaged by the integrated circuit ic (integrated circuit), the flexible Printed circuit (fpc) (flexible Printed circuit) and other components.
Disclosure of Invention
In view of the above, the present invention provides a pressure sensor detection circuit and a display panel including the same, wherein the pressure sensor detection circuit provided by the present invention can detect some major faults (for example, short circuit or open circuit between sense resistors) of a pressure sensor of a display panel at a visual test (hereinafter, abbreviated as VT test) stage before a display panel is bonded with an integrated circuit (ic), a flexible Printed circuit (fpc), and other components.
The embodiment of the invention provides a pressure sensor detection circuit, which is characterized by comprising the following components:
a pressure sensor comprising a first sensor output;
a demultiplexing module;
at least one of the data lines is divided into a first portion and a second portion;
the first control circuit comprises a first control end, a first receiving end and a first output end, wherein the first control end is electrically connected with the output end of the first sensor, and the first receiving end continuously receives the output signal of the demultiplexing module;
the second control circuit comprises a second control end, a second receiving end and a second output end, wherein the second control end is electrically connected with the first output end, the first part of the data line is electrically connected with the second output end, and the second part of the data line is electrically connected with the second receiving end;
the pressure sensor detection circuit controls the on-off of the data line by controlling the on-off of the second output end and the second receiving end.
The embodiment of the invention also provides a display panel, which is characterized by comprising the pressure sensor detection circuit.
Compared with the prior art, the pressure sensor detection circuit and the display panel provided by the invention have the advantages that the control circuit is erected between the pressure sensor and the demultiplexing module (DEMUX module), the first control end of the control circuit receives signals at the output end of the pressure sensor, the first receiving end receives output signals of the demultiplexing module, and the on-off between the second output end and the second receiving end bridged on the data line is controlled according to different received signals so as to control the on-off of the corresponding data line. By adopting the pressure sensor detection circuit provided by the invention, only in a VT test stage, input signals are supplied to the pressure sensor and the demultiplexing module, and meanwhile, simple test data line signals are provided for the display panel; when the pressure sensor is in a normal state, the pressure sensor detection circuit controls the second output end to be conducted with the second receiving end, at the moment, the data line connected with the second output end and the second receiving end is conducted, the signal of the data line can be smoothly connected into the data line, and the display panel normally displays a test picture under VT test; when the pressure sensor is in some abnormal short circuit or short circuit state, the pressure sensor detection circuit controls the second output end to be disconnected with the second receiving end, at the moment, the data line connected with the second output end and the second receiving end is disconnected, the data line signal can not be connected into the data line, and the test picture of the display panel under the VT test shows abnormal (for example, a strip-shaped dark line appears). In summary, the above is provided. The pressure sensor detection circuit and the display panel provided by the invention can test some common pressure sensor faults in the VT test stage, on one hand, the part loss of the pressure sensor faults is avoided if the display panel is bound with parts such as an Integrated Circuit (IC), a Flexible Printed Circuit (FPC), and the like, and the production cost of the display panel is saved; on the other hand, the pressure sensor detection circuit provided by the invention controls the access of the data line signal by utilizing the inherent output signal of the pressure sensor and the demultiplexing module (DEMUX module), has a simple structure, can directly observe the test result by naked eyes, and is simple, convenient and efficient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an equivalent circuit of a prior strain gauge pressure sensor;
FIG. 2 is a schematic diagram of a conventional display module;
FIG. 3 is a schematic diagram of a detection circuit of the pressure sensor according to the embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a display area of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another pressure sensor detection circuit according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a semiconductor switch tube;
FIG. 7 is a schematic diagram of a detection circuit of another pressure sensor according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a pressure sensor in a pressure sensor detection circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another pressure sensor in a pressure sensor detection circuit according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a detection circuit of another pressure sensor provided in an embodiment of the present invention;
FIG. 11 is a schematic diagram of a demultiplexing module;
fig. 12 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a conventional display module, in the prior art, generally, after a display module is formed by binding components such as an integrated circuit 202 and a flexible circuit board 203 to a display panel 201, the quality of a pressure sensor of the display panel can be detected, if the pressure sensor has a problem, the display module is scrapped, and the bound components such as the integrated circuit 202 and the flexible circuit board 203 cannot be detached for reuse, which causes waste.
When the display panel is not bound with the integrated circuit 202, the flexible circuit board 203, and other components, if the display panel is manufactured and the performance of the display panel needs to be tested, a visual test pad (VT pad) is generally arranged on the display panel, and the performance of the display panel is tested by inputting a test signal to the VT pad on the display panel, where the test stage is a VT test stage. At present, because the components such as a flexible circuit board, an integrated circuit and the like are not bound in the VT test stage, a probe test method is adopted for the VT test, a VT pad is designed at the step of a panel, and a voltage signal of a test picture is input through a probe.
The embodiment of the invention provides a pressure sensor detection circuit, which can detect when a display panel is not bound with components such as an integrated circuit, a flexible circuit board and the like, and is characterized by comprising the following components: a pressure sensor comprising a first sensor output; a demultiplexing module; at least one of the data lines is divided into a first portion and a second portion; the first control circuit comprises a first control end, a first receiving end and a first output end, wherein the first control end is electrically connected with the output end of the first sensor, and the first receiving end continuously receives the output signal of the demultiplexing module; the second control circuit comprises a second control end, a second receiving end and a second output end, wherein the second control end is electrically connected with the first output end, the first part of the data line is electrically connected with the second output end, and the second part of the data line is electrically connected with the second receiving end; the pressure sensor detection circuit controls the on-off of the data line by controlling the on-off of the second output end and the second receiving end.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram of a detection circuit structure of the pressure sensor according to the embodiment of the present invention. The pressure sensor detection circuit includes a pressure sensor 300, a demultiplexing module 310, a first control circuit 301, a second control circuit 302, a data line first portion 321, and a data line second portion 322. The pressure sensor 300 includes a first sensor output end 300a, the first control circuit 301 includes a first control end 301a, a first receiving end 301b and a first output end 301c, and the second control circuit 302 includes a second control end 302a, a second receiving end 302b and a second output end 302 c. The first control end 301a is electrically connected to the first sensor output end 300a, and receives the output signal of the pressure sensor 300, and the first receiving end 301b continuously receives the output signal of the demultiplexing module 310 through the demultiplexing module output end 301 a; the second control terminal 302a is electrically connected to the first output terminal 301c, the second output terminal 302c is electrically connected to the first portion 321 of the data line, and the second receiving terminal 302b is electrically connected to the second portion 322 of the data line.
As can be seen from fig. 3, the data line 320 is divided into a data line first portion 321 and a data line second portion 322, so whether the data line 320 is conducted or not depends on whether the data line first portion 321 and the data line second portion 322 are conducted or not, i.e., whether the second output terminal 302c is conducted or not is conducted with the second receiving terminal 302 b. The demultiplexing module (DEMUX module) is a module that decomposes a plurality of integrated signals into a plurality of control signals, which are commonly used in a display panel, and controls a display screen. Therefore, in different states of the pressure sensor 300, the first sensor output end 300a outputs different signals, which results in the on or off between the second output end 302c and the second receiving end 302b, thereby comparing and determining the fault state and the normal state.
Referring to fig. 4 again, fig. 4 is a circuit schematic diagram of the display area of the display panel according to the embodiment of the invention, in which a plurality of data lines 320 and a plurality of gate lines 400 define a plurality of sub-pixel areas 410, each sub-pixel area includes a thin film transistor 420, and whether a data line data signal on the data line 320 is input to a pixel electrode 430 in the corresponding sub-pixel area 410 is controlled by controlling the on and off of the thin film transistor 420 according to a driving signal on the gate line 400, so as to realize display control of each sub-pixel. Therefore, when the second output terminal 302c and the second receiving terminal 302b in fig. 3 are conducted, the data signal of the data line can be smoothly transmitted to the data line 320, and the display panel can normally display a predetermined test frame; when the second output terminal 302c is disconnected from the second receiving terminal 302b, the data signal of the data line cannot be smoothly transmitted to the data line 320, and the display panel cannot normally display a predetermined test picture, it is conceivable that at this time, the sub-pixels corresponding to the data line 320 connected to the second control circuit 302 cannot receive the data signal of the data line and cannot display a predetermined pattern, thereby causing abnormal display in a local area of the display panel.
Through the pressure sensor detection circuit provided by the embodiment, after a power supply of a display panel, a data signal of a data line, a display driving signal and the like are directly connected in a VT test stage, whether the state of the pressure sensor is normal or abnormal is judged through the display effect of the display panel on a preset test pattern, and if the state is inconsistent with a test picture obtained by a normal pressure sensor, the pressure sensor is in failure with high probability. The pressure sensor detection circuit provided by the embodiment has a simple structure and is convenient to test; in addition, since testing by means of an integrated circuit and some circuit assemblies on a flexible circuit board is not required, even if a failure or damage of the pressure sensor is found during testing, the components such as the integrated circuit and the flexible circuit board are not wasted.
Still further, embodiments of the present invention provide another pressure sensor detection circuit. Referring to fig. 5 in particular, fig. 5 is a schematic diagram of another pressure sensor detection circuit structure provided in the embodiment of the present invention. As shown in fig. 5, the first control circuit 301 includes a first switch tube K1, and the second control circuit includes at least a second switch tube K2 (only one second switch tube K2 is illustrated).
Referring to fig. 6, fig. 6 is a schematic cross-sectional structure of the semiconductor switch tube. As shown in fig. 6, the semiconductor switching tube includes a gate electrode 603, which may include a single layer or multiple layers of gold (Au), silver (Ag), copper (Cu), nickel (Ni), platinum (Pt), palladium (Pd), aluminum (Al), molybdenum (Mo), or chromium (Cr), or an alloy such as aluminum (Al): neodymium (Nd) alloy, molybdenum (Mo): tungsten (W) alloy; the gate electrode 603 has thereon an insulating layer 605, and the insulating layer 605 includes an inorganic layer such as silicon oxide, silicon nitride, or a metal oxide, and may include a single layer or a plurality of layers; a semiconductor active layer 604 is disposed on the insulating layer, and the semiconductor active layer 604 may be formed by changing amorphous silicon into polycrystalline silicon through crystallization of amorphous silicon; a source electrode 602 and a drain electrode 601 are disposed over the semiconductor active layer, and the source electrode 602 and the drain electrode 601 are electrically connected to a source region and a drain region of the semiconductor active layer 604, respectively. For the semiconductor switch tube with the semiconductor active layer 604 doped P-type, when a low level signal is inputted to the gate, the semiconductor active layer 604 is conducted to make the source 602 and the drain 601 conductive, and when a high level signal is inputted to the gate, the semiconductor active layer 604 is not conducted to make the source 602 and the drain 601 non-conductive; for the semiconductor switch tube with the semiconductor active layer 604 being N-type doped, when a high level signal is inputted to the gate, the semiconductor active layer 604 is turned on to make the source 602 and the drain 601 conductive, and when a low level signal is inputted to the gate, the semiconductor active layer 604 is turned off to make the source 602 and the drain 601 nonconductive.
Therefore, by utilizing the above characteristics of the switching tube, referring to fig. 5 again, the first control terminal 301a is the gate of the first switching tube K1, the first receiving terminal 301b is the drain of the first switching tube K1, and the first output terminal 301c is the source of the first switching tube K1; the second control terminal 302a is the gate of the second switch transistor K2, the second receiving terminal 302b is the drain of the second switch transistor K2, and the second output terminal 302c is the source of the second switch transistor K2; it will be appreciated that the positions of the source and drain electrodes may be interchanged.
Because the principle of the strain gauge pressure sensor is based on the change of resistance after stress, the common faults and abnormalities of the strain gauge pressure sensor generally cause the change of effective access resistance, so that the output signal potential of the pressure sensor is changed. With this feature, after the pressure sensor detection circuit is provided according to the above structure, the operation of the circuit is exemplarily described as follows:
for example, the demultiplexing module outputs a high-level pulse signal to control the display, and selects the first switch tube K1 and the second switch tube K2 as N-type switch tubes;
when the output signal of the first sensor output end 300a is at a high level, the first control end 301a (the gate of K1) receives a high level signal, so that the first receiving end 301b (the source of K1) and the first output end 301c (the drain of K1) are turned on, the high level pulse signal output by the demultiplexing module is transmitted to the second control end 302a (the gate of K2), so that the second receiving end 302b (the source of K2) and the second output end 302c (the drain of K2) are turned on, at this time, the first portion 321 of the data line is turned on with the second portion 322 of the data line, the data signal of the data line can be normally transmitted into the data line 320, and the test picture can be normally displayed;
when the output signal of the first sensor output terminal 300a is at a low level, the first control terminal 301a (the gate of K1) receives a low level signal, so that the first receiving terminal 301b (the source of K1) and the first output terminal 301c (the drain of K1) are disconnected, the high level pulse signal output by the demultiplexing module cannot be transmitted to the second control terminal 302a (the gate of K2), so that the second receiving terminal 302b (the source of K2) and the second output terminal 302c (the drain of K2) are disconnected, at this time, the first portion 321 of the data line is disconnected from the second portion 322 of the data line, the data signal of the data line cannot be normally transmitted to the data line 320, and the test picture cannot be normally displayed.
Since the output signal of the demultiplexer circuit commonly used in a typical display panel is a high level pulse, N-type switching transistors are preferably used for the first switching transistor K1 and the second switching transistor K2.
In this way, in the VT test stage, the property of the potential at the output end 300a of the first sensor can be determined according to the test picture after the test display data signal is input to the display panel, and if the property is inconsistent with the test picture obtained by the normal pressure sensor, the pressure sensor is likely to fail. The pressure sensor detection circuit in the embodiment adopts the switch tube as the control circuit, and because the switch tube has high sensitivity, and the Thin Film Transistor (TFT) in the switch tube can be manufactured on the glass substrate together with other structures in the display panel, the compatibility is good, and the manufacture is convenient.
Furthermore, two or more second switch tubes of the pressure sensor detecting circuit may be provided, as shown in fig. 7, fig. 7 is a schematic structural diagram of another pressure sensor detecting circuit provided in the embodiment of the present invention, where the second control circuit 302 includes two second switches, a No. 1 second switch tube K2, and a No. 2 second switch tube K3, a source of the No. 1 second switch tube K2 is a No. 1 second control end 302a, a drain of the No. 1 second switch tube K2 is a No. 1 second output end 302c, a source of the No. 1 second switch tube K2 is a No. 1 second receiving end 302b, the No. 1 second output end 302c is electrically connected to the data line first portion 321 of the No. 1 data line 320, and the No. 1 second receiving end 302b is electrically connected to the data line second portion 322 of the No. 1 data line 320; the source of the second switch transistor K3 # 2 is the second control terminal 303a # 2, the drain of the second switch transistor K3 # 2 is the second output terminal 303c # 2, the source of the second switch transistor K3 # 2 is the second receiving terminal 303b # 2, the second output terminal 303c # 2 is electrically connected to the first portion 331 of the data line 330 # 2, and the second receiving terminal 303b # 2 is electrically connected to the second portion 332 of the data line 330 # 2.
Since the second control end 303a No. 2 and the second control end 302a No. 1 are both electrically connected to the first output end 301c, and except for the second control circuit, the structure of the pressure sensor detection circuit shown in fig. 7 is identical to that of the pressure sensor detection circuit shown in fig. 5, so that the on-off of the data line 320 No. 1 and the data line 330 No. 2 are synchronous, and are affected by the output signal of the first sensor output end 300a according to the principle of the pressure sensor detection circuit shown in fig. 5, and the action rule is also identical to that of the pressure sensor detection circuit provided in the embodiment of fig. 5, and will not be described herein again.
By adopting the pressure sensor detection circuit provided in fig. 7, the number of switching tubes (not limited to 2 shown in the figure) of the second control circuit is increased, so that in the VT test stage, if the output signal potential of the first sensor output end 300a changes due to a pressure sensor fault, the number of affected data lines on the display panel becomes large, the area of an area which is abnormally displayed on the test screen after the test display data signal is input by the display panel becomes large (for example, a plurality of dark lines occur), and a product with poor test is more easily perceived by vision; in addition, the probability of misjudgment as a pressure sensor fault caused by the self open circuit fault of the data line can be greatly reduced by adopting the second switch tubes to be electrically connected with different data lines.
The invention also provides a pressure sensor detection circuit, wherein the pressure sensor is in a bridge structure. As shown in fig. 8, fig. 8 is a schematic diagram of a pressure sensor in a pressure sensor detection circuit according to an embodiment of the present invention, in which the pressure sensor 300 includes a first sensor output 300a, a second sensor output 300b, a first sensor input 300c and a second sensor input 300d, wherein the first sensor input 300c and the second sensor input 300d apply a sensor power voltage, and generally, in order to enable the first sensor output 300a and the second sensor output 300b to have output voltages responding to different pressures, input signals of the first sensor input 300c and the second sensor input 300d should have a voltage difference even though generally having a relatively high level and a relatively low level.
With continued reference to fig. 8, in this embodiment, the pressure sensor 300 further includes a first sensing resistor R1, a second sensing resistor R2, a third sensing resistor R3, and a fourth sensing resistor R4, a first end a1 of the first sensing resistor R1 and a first end C1 of the third sensing resistor R3 are electrically connected to the first sensor input terminal 300C, a second end a2 of the first sensing resistor R1 and a first end B1 of the second sensing resistor R2 are electrically connected to the first sensor output terminal 300a, a second end C2 of the third sensing resistor R3 and a first end D1 of the fourth sensing resistor R4 are electrically connected to the second sensor output terminal 300B, and a second end B2 of the second sensing resistor R2 and a second end D4 of the fourth sensing resistor R4 are electrically connected to the second sensor input terminal 300D. After the values of the first sensing resistor R1, the second sensing resistor R2, the third sensing resistor R3 and the fourth sensing resistor R4 are preset, a sensor power supply voltage is applied to the first sensor input end 300c and the second sensor input end 300d, the first sensor output end 300a and the second sensor output end 300b both output preset voltages, after pressure is applied, received stresses are different due to different positions of the sensing resistors, so that the change ratios of the four sensing resistors are different, and the output voltages of the first sensor output end 300a and the second sensor output end 300b change along with the pressure, thereby realizing pressure sensing.
When the temperature of the pressure sensor with the bridge structure changes, if the pressure sensor is made of four sensing resistors made of the same material, the change rate of the impedance of each sensing resistor along with the temperature change is approximately the same, the output voltage of the output end of the first sensor and the output voltage of the output end of the second sensor are basically unchanged according to the voltage calculation of the bridge, and therefore the interference of external factors other than pressure stress on a circuit can be compensated.
In addition, as shown in fig. 9, fig. 9 is a schematic structural diagram of another pressure sensor in a pressure sensor detection circuit provided in the embodiment of the present invention, in which the pressure sensor 300 is a semiconductor pressure sensor, and also includes a first sensor output 300a, a second sensor output 300b, a first sensor input 300c, and a second sensor input 300d, and a first straight line 901 along which the first sensor output 300a and the second sensor output 300b are located intersects a second straight line 902 along which the first sensor input 300c and the second sensor input 300d are located. When the semiconductor pressure sensor is made of a polysilicon material film, doping may be performed when the semiconductor pressure sensor is made of the polysilicon material film. The semiconductor pressure sensor utilizes resistance change caused by stress of the polycrystalline silicon crystal lattice to achieve the purpose of identifying the size of touch pressure.
The semiconductor pressure sensor can ensure that the impedance of the strain resistor is not too large, is favorable for signal transmission and detection, and is also convenient to manufacture on a display panel by adopting a polysilicon material.
Based on the above-mentioned several pressure sensor structures, the embodiment of the present invention further provides a pressure sensor detection circuit based on the pressure sensor with a bridge structure, and fig. 10 is a schematic structural diagram of another pressure sensor detection circuit provided by the embodiment of the present invention.
Specifically, referring to fig. 10, the data line 320 includes a first data line portion 321, a second data line portion 322, and a third data line portion 323, and the structures of the first control circuit 301 and the second control circuit 302 are the same as those shown in fig. 5, and are not repeated herein.
With continued reference to fig. 10, the pressure sensor detecting circuit further includes a third control circuit 803 and a fourth control circuit 804, wherein the third control circuit 803 includes a third control terminal 803a, a third receiving terminal 803b and a third output terminal 803c, the third control terminal 803a is electrically connected to the second sensor output terminal 300b, and the third receiving terminal 803b continuously receives the output signal of the demultiplexing module 310; the fourth control circuit 804 includes a fourth control terminal 804a, a fourth receiving terminal 804b and a fourth output terminal 804c, the fourth control terminal 804a is electrically connected to the third output terminal 803c, the data line second portion 322 is electrically connected to the fourth output terminal 804c (it should be understood that the data line second portion 322 is also electrically connected to the second receiving terminal 302b, and the data line second portion 322 in the structure of fig. 10 only functions to electrically connect the second receiving terminal 302b to the fourth output terminal 804c, and at this time, the data line second portion 322 may be removed to directly electrically connect the second receiving terminal 302b to the fourth output terminal 804 c), and the data line third portion 323 is electrically connected to the fourth receiving terminal 804 b.
For describing the operation state of the detection circuit, the four control circuits are exemplarily configured as an N-type switch tube (where the second control circuit 302 and the fourth control circuit 804 may adopt a plurality of switch tube structures like the second control circuit of fig. 7), and the effective output of the demultiplexing module is a high-level pulse signal, there are the following four cases:
when the output signal of the first sensor output 300a is at a high level and the output signal of the second sensor output 300b is also at a high level, the switching transistor K1 of the first control circuit 301 and the switching transistor K2 of the second control circuit 302 are turned on, the switching transistor K3 of the third control circuit 803 and the switching transistor K4 of the fourth control circuit 804 are turned on, and at this time, the first portion 321 of the data line, the second portion 322 of the data line and the third portion 323 of the data line are turned on, so that the data signal of the data line can be smoothly transmitted to the data line 320;
in the first state, when the output signal of the first sensor output 300a is at a high level and the output signal of the second sensor output 300b is also at a high level, the switch transistor K1 of the first control circuit 301 and the switch transistor K2 of the second control circuit 302 are turned on, the switch transistor K3 of the third control circuit 803 and the switch transistor K4 of the fourth control circuit 804 are turned on, and at this time, the first portion 321 of the data line, the second portion 322 of the data line and the third portion 323 of the data line are turned on, so that the data signal of the data line can be smoothly transmitted to the data line 320;
in the second state, when the output signal of the first sensor output terminal 300a or the output signal of the second sensor output terminal 300b is at a low level, at least one of the switch K3 of the third control circuit 803 and the switch K4 of the fourth control circuit 804 is turned off, at this time, at least one segment among the first portion 321, the second portion 322 and the third portion 323 of the data line is not turned on, and the data signal of the data line cannot be successfully transmitted to the data line 320.
The pressure sensor detection circuit structure can comprehensively test the output signals of the two output ends of the bridge-structured pressure sensor, and can simultaneously detect the fault states of the two sensing resistors electrically connected with the first sensor output end 300a and the two sensing resistors electrically connected with the second sensor output end 300 b.
For example, if a bias power voltage is applied to the first sensor input end 300c and the second sensor input end 300d in the normal state of the pressure sensor, wherein the first sensor input end 300c inputs a high level signal, the second sensor output end inputs a low level signal, and simultaneously both the first sensor output end 300a and the second sensor output end 300b output a high level signal, as can be known from fig. 5, 8 and 10, the second output end 302c and the second receiving end 302b of the second control circuit 302 are turned on, the fourth output end 804c and the fourth receiving end 804b of the fourth control circuit 804 are also turned on, and the data line 320 is turned on to transmit a data signal, the display panel can normally display a test picture in the VT test phase;
if the first sensing resistor R1 is normal but the second sensing resistor R2 is short-circuited or the first sensing resistor R1 is open-circuited, the first sensor output terminal 300a outputs a low level signal, and the second output terminal 302c and the second receiving terminal 302b of the second control circuit 302 are disconnected; if the third sensing resistor R3 is normal but the fourth sensing resistor R4 is short-circuited or the third sensing resistor R3 is open-circuited, the second sensor output terminal 300b outputs a low level signal, and the fourth output terminal 804c and the fourth receiving terminal 804b of the fourth control circuit 804 are disconnected. The open circuit or short circuit fault of these pressure sensors can cause the data line 320 to have a disconnected portion, so that the data signal of the data line cannot be transmitted, and the display panel cannot normally display the test picture (for example, there is an area near the corresponding data line where the picture is not displayed) in the VT test stage.
Referring to fig. 11 again, fig. 11 is a schematic structural diagram of a demultiplexing module, the demultiplexing module (DEMUX module) basically functions to expand one input signal into a plurality of output signals, and since the display panel is generally divided into a red sub-pixel, a green sub-pixel and a blue sub-pixel, as shown in fig. 11 (the structure shown in fig. 11 is a schematic structural diagram of basic functions, it can be understood that the input signal can be decomposed by a logic circuit formed by more switching tubes), the demultiplexing module can decompose the comprehensive input signal D1 into desired red shift pulse signals CKH-R, green shift pulse signals CKH-G, blue shift pulse signals CKH-B by passing through the first switching tube T1, the second switching tube T2 and the third switching tube T3 under the control of the first control signal S1, the second control signal S2 and the third control signal S3, wherein the red shift pulse signal CKH-R is determined by the first control signal S1 and the synthesized input signal D1, the green shift pulse signal CKH-G is determined by the second control signal S2 and the synthesized input signal D1, and the blue shift pulse signal CKH-B is determined by the third control signal S3 and the synthesized input signal D1, so that the decomposed red shift pulse signal CKH-R, the green shift pulse signal CKH-G, and the blue shift pulse signal CKH-B can be directly and independently controlled; correspondingly, the output signals of the demultiplexing module continuously received by the pressure sensor detection circuit can be red shift pulse signals CKH-R, green shift pulse signals CKH-G or blue shift pulse signals CKH-B. Thus, different preset display frames for testing the VT phases can be configured.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and the embodiment of the present invention further provides a display panel including the pressure sensor detection circuit. Further, the display panel 1200 includes a display region 1201 and a non-display region 1202, and the pressure sensor 300, the first control circuit 301, and the second control circuit 302 are located in the non-display region 1202. The added control circuit can not influence the arrangement of the devices in the display area to influence the display effect.
Furthermore, the display panel provided by the invention is provided with a visual test pad (VT pad)1203, and the panel is subjected to a pressure sensor performance test by inputting a test signal to the visual test pad 1203 on the panel.
In summary, in the invention, the control circuit is arranged between the pressure sensor and the demultiplexing module, the data lines are connected through the control circuit, and the control circuit can respond differently to control the connection and disconnection of the connected data lines according to the logical relationship of the control circuit and the output signals of different pressure sensors, so as to control the display result of the display panel on the preset test picture, and determine whether the pressure sensor has common faults such as open circuit or short circuit according to the display result. Because the output signal of the pressure sensor is not required to be processed by elements on components such as an integrated circuit, a flexible circuit board and the like, and is only required to be processed by a simple control circuit, the pressure sensor can be detected in a VT test stage, the loss of the components such as the integrated circuit, the flexible circuit board and the like caused by fault detection after the components such as the integrated circuit, the flexible circuit board and the like are assembled in a module stage is avoided, in addition, the detection result can be directly seen from the display condition of the display panel, and the detection is convenient and quick.
The pressure sensor detection circuit and the display panel provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in detail herein by applying specific examples, and the description of the above embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A pressure sensor detection circuit, comprising:
a pressure sensor comprising a first sensor output;
a demultiplexing module;
at least one of the data lines is divided into a first portion and a second portion;
the first control circuit comprises a first control end, a first receiving end and a first output end, wherein the first control end is electrically connected with the output end of the first sensor, and the first receiving end continuously receives the output signal of the demultiplexing module; the first control circuit comprises a first switch tube, the first control end is a grid electrode of the first switch tube, the first receiving end is a source electrode of the first switch tube, and the first output end is a drain electrode of the first switch tube;
the second control circuit comprises a second control end, a second receiving end and a second output end, wherein the second control end is electrically connected with the first output end, the first part of the data line is electrically connected with the second output end, and the second part of the data line is electrically connected with the second receiving end; the second control circuit comprises a plurality of second switching tubes, the second control end is a grid electrode of the second switching tubes, the second receiving end is a source electrode of the second switching tubes, and the second output end is a drain electrode of the second switching tubes; the grid electrode of each second switch tube is the second control end, the second control end is electrically connected with the first output end, the source electrode of each second switch tube is a second receiving end, and the drain electrode of each second switch tube is a second output end; each second switching tube is electrically connected with different data lines;
the pressure sensor detection circuit controls the on-off of the data line by controlling the on-off of the second output end and the second receiving end.
2. The pressure sensor detection circuit of claim 1, wherein the first switch tube and the second switch tube are both N-type switch tubes.
3. The pressure sensor sensing circuit of claim 1, wherein the pressure sensor is in a bridge configuration, the pressure sensor further comprising a first sensor input, a second sensor input, and a second sensor output, wherein the first sensor input and the second sensor input are configured to receive a sensor supply voltage.
4. The pressure sensor sensing circuit of claim 1,
when the pressure sensor is in a first state, the pressure sensor detection circuit controls the second output end to be conducted with the second receiving end,
when the pressure sensor is in a second state, the pressure sensor detection circuit controls the second output end to be disconnected with the second receiving end;
the first state is a normal state of the pressure sensor, and the second state is an abnormal state in which a short circuit or an open circuit fault occurs in the pressure sensor.
5. The pressure sensor sensing circuit of claim 3, wherein the pressure sensor comprises a first sense resistor, a second sense resistor, a third sense resistor, and a fourth sense resistor;
the first end of first sense resistor and the first end of third sense resistor is connected with first sensor input electricity, the second end of first sense resistor and the first end of second sense resistor is connected with first sensor output electricity, the second end of third sense resistor and the first end of fourth sense resistor with second sensor output electricity is connected, the second end of second sense resistor and the second end of fourth sense resistor is connected with second sensor input electricity.
6. The pressure sensor sensing circuit of claim 3, wherein the pressure sensor is a semiconductor pressure sensor, and a first line along which the first sensor output and the second sensor output lie intersects a second line along which the first sensor input and the second sensor input lie.
7. The pressure sensor sensing circuit of claim 3, wherein the data line further includes a third portion, the sensor sensing circuit further comprising:
the third control circuit comprises a third control end, a third receiving end and a third output end, the third control end is electrically connected with the output end of the second sensor, and the third receiving end continuously receives the output signal of the demultiplexing module;
the fourth control circuit comprises a fourth control end, a fourth receiving end and a fourth output end, wherein the fourth control end is electrically connected with the third output end, the second part of the data line is electrically connected with the fourth output end, and the third part of the data line is electrically connected with the fourth receiving end;
when the second output end is conducted with the second receiving end and the fourth output end is conducted with the fourth receiving end, the data line is conducted;
and when the second output end is disconnected with the second receiving end or the fourth output end is disconnected with the fourth receiving end, the data line is disconnected.
8. The pressure sensor sensing circuit of claim 1, wherein the demultiplexing module decomposes the received composite input signal into a red shifted pulse signal, a green shifted pulse signal, and a blue shifted pulse signal; the demultiplexing module output signal is the red shift pulse signal or the green shift pulse signal or the blue shift pulse signal.
9. A display panel characterized by comprising the pressure sensor detecting circuit according to any one of claims 1 to 8.
10. The display panel according to claim 9, wherein the display panel includes a display area and a non-display area, and the pressure sensor, the first control circuit, and the second control circuit are in the non-display area.
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| CN102879964B (en) * | 2012-10-11 | 2015-04-29 | 深圳市华星光电技术有限公司 | Array substrate and polymer-stabilized vertical alignment (PSVA) type liquid crystal display panel |
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