CN107479759B - Pressure touch display panel, detection method and display device - Google Patents
Pressure touch display panel, detection method and display device Download PDFInfo
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- CN107479759B CN107479759B CN201710778543.XA CN201710778543A CN107479759B CN 107479759 B CN107479759 B CN 107479759B CN 201710778543 A CN201710778543 A CN 201710778543A CN 107479759 B CN107479759 B CN 107479759B
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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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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Abstract
The invention discloses a pressure touch display panel, which comprises a display area and a non-display area surrounding the display area, wherein the non-display area is provided with at least one pressure sensing element, a switch module, a first circuit module and a test module; the pressure sensing element is provided with a first output end, a second output end, a first input end and a second input end, one end of the first output end is electrically connected with the driving circuit, and the other end of the first output end is electrically connected with the switch module; one end of the second output end is electrically connected with the driving circuit, and the other end of the second output end is electrically connected with the switch module; the other end of the switch module is electrically connected with the first circuit module; the output end of the first circuit module is electrically connected with the control end of the test module and is used for controlling the test module to be opened and closed; when the pressure-sensitive elements all work normally, the signal output by the output end of the first circuit module can be conducted to the test module for display detection. Need not to increase extra detection terminal, saved detection time and cost on current structure basis.
Description
Technical Field
The invention relates to the field of display, in particular to a pressure touch display panel, a detection method and a display device.
Background
At present, touch panels are widely used in electronic devices such as mobile phones, tablet computers, and information query machines in halls of public places. 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 addition, in order to enrich the man-machine touch operation, a pressure sensor for sensing the pressure is usually added in the display panel. Therefore, the display panel can sense the touch position of a consumer and also can sense the touch pressure, so that the operation is enriched.
The pressure sensor is usually integrated on the display panel, but due to the process, the failure of the pressure sensor due to the disconnection may be caused, and the display panel finally formed may not work normally due to the failure of the pressure sensor, resulting in the waste of process materials in the subsequent process. However, the number of test terminals used for display test in the current display panel is too many, and extra and redundant test terminals cannot be added for the pressure sensor for detection, so that a mode and a structure for solving the pressure sensor are urgently needed, and time and cost can be saved on the basis of the structure of the current display panel.
Disclosure of Invention
In order to solve the above problems, the present invention provides a pressure touch display panel, which includes a display area and a non-display area surrounding the display area, wherein the non-display area is provided with at least one pressure sensing element, a switch module, a first circuit module and a test module;
the pressure sensing element is provided with a first output end, a second output end, a first input end and a second input end, one end of the first output end is electrically connected with the driving circuit, and the other end of the first output end is electrically connected with the switch module; one end of the second output end is electrically connected with the driving circuit, and the other end of the second output end is electrically connected with the switch module;
the other end of the switch module is electrically connected with the first circuit module;
the output end of the first circuit module is electrically connected with the control end of the test module and is used for controlling the test module to be opened and closed; when the pressure-sensitive elements all work normally, the signal output by the output end of the first circuit module can conduct the test module for display detection.
A pressure touch test method for testing the pressure touch display panel comprises the following steps:
controlling the switch module to be conducted;
a first stage of inputting a high level signal to the first input terminal and inputting a fixed potential to the second input terminal;
and in the second stage, a fixed potential is input into the first input end, and a high-level signal is input into the first input end.
The pressure touch display device comprises the pressure touch display panel.
Compared with the prior art, the technical scheme of the invention has one of the following advantages: after the pressure sensing element performs AND operation through the switch module and the first circuit module, the test signal transmitted by the driving circuit is transmitted to the test module, and the test module is used for performing touch test. In the testing stage, the driving circuit transmits testing signals to all the pressure sensing elements, the switch module is conducted, and when all the pressure sensing elements can work normally, the testing module can be conducted through signals output by the first circuit module to conduct touch testing. The invention combines the pressure sensing test and the touch control test into a whole, thereby not only saving the test time and the labor, but also being capable of specifically detecting which half-bridge arm of the pressure sensing element has a problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a pressure touch display panel according to the prior art;
fig. 2 is a schematic block diagram of a touch display panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a switch module of a touch display panel according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a first circuit module of a touch display panel according to an embodiment of the invention;
fig. 5 is a schematic diagram of a first circuit module of another touch display panel according to an embodiment of the disclosure;
fig. 6 is a schematic structural diagram of a pressure touch display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another pressure touch display panel according to an embodiment of the present invention;
fig. 8 is a schematic plan view illustrating a pressure touch display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a testing module of a pressure touch display panel according to an embodiment of the present invention;
fig. 10 is a schematic plan view of a pressure touch display panel according to an embodiment of the present invention;
FIG. 11 is a schematic view of a pressure sensor according to an embodiment of the present invention;
FIG. 12 is a schematic view of another pressure sensing element provided in accordance with an embodiment of the present invention;
fig. 13 is a schematic view of a pressure touch display device according to an embodiment of the invention.
Detailed Description
A pressure touch display panel of the present invention is described in more detail below with reference to schematic drawings, in which preferred embodiments of the present invention are shown, it being understood that one skilled in the art can modify the invention described herein while still achieving the advantageous effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the 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.
Fig. 1 is a schematic diagram of a pressure touch display panel in the prior art. In the prior art, a pressure touch display panel includes a display area AA and a non-display area NAA surrounding the display area. In order to realize pressure touch, the pressure sensing element 1 is usually disposed in the non-display area NAA. The pressure sensing element 1 generally comprises two power signal input ends and two sensing signal measuring ends, and in order to ensure that the pressure sensing element 1 in the display panel can accurately detect the pressure of the touch main body pressing the display panel, the pressure sensing element 1 in the display panel needs to be tested. The specific test method is that a power signal is introduced to a power signal input end of each pressure sensing element 1 in the display panel, the touch main body presses the display panel, two sensing signal measuring ends of each pressure sensing element 1 are connected to a detecting end VT corresponding to the detecting module, and the pressure sensing element 1 in the display panel is tested through sensing signals output by the sensing signal measuring ends VT.
The figure shows only four detection terminals VT as an example, and actually, each pressure-sensitive element 1 needs to be provided with a detection terminal VT for the accuracy of detection. In addition, the data lines and the touch electrodes in the display area also need to be provided with detection ends for detection, so that the detection ends of the non-display area NAA are arranged very much and densely, and the frame area is greatly increased. More importantly, the detection of the pressure sensing element 1 also requires manpower and time, i.e. detecting the functional condition of the elements in the display area AA and detecting the functional condition of the pressure sensing element 1 in the non-display area NAA are not very convenient to use, which is not necessary to save the cost at present.
In order to solve the above problems, the present invention discloses a pressure touch display panel, which includes a display area and a non-display area surrounding the display area, wherein the non-display area is provided with at least one pressure sensing element, a switch module, a first circuit module and a test module;
the pressure sensing element is provided with a first output end, a second output end, a first input end and a second input end, one end of the first output end is electrically connected with the driving circuit, and the other end of the first output end is electrically connected with the switch module; one end of the second output end is electrically connected with the driving circuit, and the other end of the second output end is electrically connected with the switch module;
the other end of the switch module is electrically connected with the first circuit module;
the output end of the first circuit module is electrically connected with the control end of the test module and is used for controlling the test module to be opened and closed; when the pressure-sensitive elements all work normally, the signal output by the output end of the first circuit module can be conducted to the test module for display detection.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 2 is a schematic block diagram of a touch display panel according to an embodiment of the present invention, and fig. 8 is a schematic plan view of a pressure touch display panel according to an embodiment of the present invention, and the basic structure of the present invention is described with reference to fig. 2 and fig. 8. The pressure touch display panel comprises a display area AA and a non-display area NAA surrounding the display area AA, wherein the non-display area NAA is provided with at least one pressure sensing element 1, a switch module 3, a first circuit module 4 and a test module 5. Fig. 1 only shows 3 pressure-sensitive elements 1 and the approximate positional relationship between the modules by way of example, the number of the pressure-sensitive elements 1 and the positional relationship between the modules are not particularly limited in the present invention, and any matter that meets the spirit of the present invention falls within the protection scope of the present invention.
The pressure sensing device has a first output terminal VOUT1, a second output terminal VOUT2, a first input terminal (not shown) and a second input terminal (not shown). One end of the first input end VOUT1 is electrically connected with the driving circuit 2, and the other end of the first input end VOUT1 is electrically connected with the switch module 3; one end of the second output terminal VOUT2 is electrically connected to the driving circuit 2, and the other end is electrically connected to the switch module 3. The driving circuit 2 inputs a driving voltage and a detection signal to the pressure sensitive element 1.
Besides, the switch module 3 is electrically connected to the pressure-sensitive element 1, and the other end is also electrically connected to the first circuit module 4. The output end OUT of the first circuit module 4 is electrically connected to the control end of the test module 5, and is used for controlling the on and off of the test module 5. When the pressure-sensitive elements 1 are in normal operation, that is, when no open circuit or damage occurs, the detection signal output by the driving circuit 2 is output through the output terminal OUT of the first circuit module 4 via the pressure-sensitive element 1, and the output signal can be conducted to the test module 5 and subjected to display detection.
Wherein the switch module 3 comprises at least one switch unit 33 and the first circuit module 4 comprises at least one logic circuit. As shown in fig. 3 and fig. 4, fig. 3 is a schematic diagram of a switch module of a touch display panel according to an embodiment of the invention, and fig. 4 is a schematic diagram of a first circuit module of the touch display panel according to the embodiment of the invention. The specific structure of the switch module 2 and the first circuit module 3 will now be described with reference to fig. 2 to 4. As shown in fig. 4, the first circuit module 4 includes at least one logic circuit 40, and the pressure sensing elements 1, the switch units 33 and the logic circuit 40 are disposed in a one-to-one correspondence. Specifically, one pressure-sensitive element 1 is electrically connected to one switch unit 33, and one switch unit 33 is electrically connected to one logic circuit 40. The figures only exemplarily illustrate the corresponding connection of 3 pressure-sensitive elements 1, and the display panel may also be provided with 4 or more pressure-sensitive elements 1, which is not limited herein.
Specifically, the switch unit 33 includes a first switch 31 and a second switch 32, and the logic circuit 40 includes a first input terminal IN1, a second input terminal IN2, and an output terminal OUT. One end of the first switch 31 is electrically connected to the first output terminal VOUT1 of the pressure sensing device 1, and the other end is electrically connected to the first input terminal IN1 of the logic circuit 40; one end of the second switch 32 is electrically connected to the second output terminal VOUT2 of the pressure-sensitive element 1, and the other end is electrically connected to the second input terminal IN2 of the logic circuit 40. Fig. 4 shows the first switch 31 and the second switch 32 only by way of example, and the first switch 31 and the second switch 32 may also be thin film transistor switches, as shown in fig. 3. A first terminal of the first switch 31 is electrically connected to the first output terminal (refer to the first output terminal VOUT1 in fig. 2), a second terminal of the first switch 31 is electrically connected to the second output terminal (refer to the first output terminal VOUT2 in fig. 2), and a control terminal of the first switch 31 is electrically connected to the control line 30. A first terminal of the second switch 32 is electrically connected to the first output terminal (refer to the first output terminal VOUT1 in fig. 2), a second terminal of the second switch 32 is electrically connected to the second output terminal (refer to the first output terminal VOUT2 in fig. 2), and a control terminal of the second switch 32 is electrically connected to the control line 30. The control line 30 is electrically connected to the driving circuit 2, and when the driving circuit 2 outputs a control signal, the control signal is transmitted to the control ends of the first switch 31 and the second switch 32 via the control line 30, and the first switch 31 and the second switch 32 are turned on or off under the action of the control signal.
Specifically, in the first circuit block 4, the output terminals OUT of every two logic circuits 40 are electrically connected through another logic circuit 40. As shown in fig. 7, fig. 7 is a schematic structural diagram of another pressure touch display panel according to an embodiment of the present invention. With reference to fig. 4, 7 and 8, the logic circuit 40 further includes a first logic circuit 41 and a second logic circuit 42. In addition, in the pressure touch display panel, the non-display area NAA includes a first non-display area NAA1, a second non-display area NAA2 and a third non-display area NAA3, the first non-display area NAA1 is disposed opposite to the second non-display area NAA2, and the third non-display area NAA3 is connected to the first non-display area NAA1 and the second non-display area NAA 2. In the first non-display area NAA1, n pressure-sensitive elements 1 are provided, and the same number n of pressure-sensitive elements 1 are provided at corresponding positions in the second non-display area NAA2, where n is a positive integer. As shown in fig. 8, the first non-display area NAA1 is provided with 3 pressure-sensitive elements 1, and the second non-display area NAA2 is also provided with 3 pressure-sensitive elements 1, and the positions where the pressure-sensitive elements 1 on the left and right sides are provided are the same.
Specifically, the logic circuit 40 includes n first logic circuits 41 and n-1 second logic circuits 42, and fig. 4 exemplarily shows 3 first logic circuits 41 and 2 second logic circuits 42. The output terminal OUT of the first logic circuit 41 is electrically connected to the first input terminal IN1 of the first second logic circuit, and the output terminal OUT of the second first logic circuit 41 is electrically connected to the second input terminal IN2 of the second logic circuit 42. The output terminal OUT of the K-1 th second logic circuit 42 is electrically connected to the first input terminal IN1 of the K-th second logic circuit 42, and the output terminal OUT of the K +1 th first logic circuit 41 is electrically connected to the second input terminal IN2 of the K-th second logic circuit 42. The output OUT of the (n-1) th second logic circuit 42 is electrically connected to the test module 5. Wherein k is a positive integer less than or equal to n. As shown in the drawing, the first second logic circuit 42 and the third first logic circuit 41 are electrically connected to the 2 nd second logic circuit 42, and the specific connection relationship is as described above and will not be described herein again. The output OUT of the second logic circuit 42 is electrically connected to the test module 5.
In addition, the connection manner between the logic circuits 40 can also be as shown in fig. 5, and fig. 5 is a schematic diagram of a first circuit module of another touch display panel according to an embodiment of the present invention. Every two logic circuits 40 IN the first stage are electrically connected, the output terminal OUT of one logic circuit 40 is electrically connected to the first input terminal IN1 of the logic circuit 40 IN the second stage, and the output terminal OUT of the other logic circuit 40 is electrically connected to the second input terminal IN2 of the same logic circuit 40 IN the second stage. In the second stage logic circuit 40, every two logic circuits 40 are electrically connected through the third stage logic circuit 40. In summary, in the kth stage logic circuit 40, every two logic circuits 40 are electrically connected through the kth +1 stage logic circuit 40, and the output end of the last stage logic circuit 40 is electrically connected to the test module 5. In which the last stage logic circuit 40 has only one logic circuit 40. As shown in the figure, the first stage logic circuit 40 has 4 logic circuits 40, the second stage logic circuit 40 has 2 logic circuits 40, and the third stage logic circuit 40 has 1 logic circuit.
In addition, since the first non-display area NAA1 and the second non-display area NAA2 are provided with the pressure sensitive elements 1, the last pressure sensitive element 1 of the first non-display area NAA1 and the last pressure sensitive element 1 of the second non-display area NAA2 are electrically connected through the second logic circuit 42. Therefore, the test of all the pressure sensing elements can be realized, and the test is finally output by one output end through one logic circuit. The signal output by the output end is definite, when all the pressure sensing elements work normally, the output test signal outputs a high level signal through the AND operation of the logic circuit 40, and the high level signal can conduct the control end of the switch in the test module 5 at the moment, so that the two-in-one of the pressure sensing test and the display test is realized.
Now, a structure diagram of the logic circuit is specifically described with reference to fig. 6, and fig. 6 is a schematic structural diagram of a pressure touch display panel according to an embodiment of the present invention. The logic circuit 40 includes a first thin film transistor M1, a second thin film transistor M2, a third thin film transistor M3, a fourth thin film transistor M4, a low level signal terminal VGL, and a high level signal terminal VGH, which form an and circuit.
The control terminal of the first thin film transistor M1 is electrically connected to the first input terminal VOUT1 of the pressure sensing device 1, the first terminal of the first thin film transistor M1 is electrically connected to the low level signal terminal VGL, and the second terminal of the first thin film transistor M1 is electrically connected to the output terminal OUT of the logic circuit 40.
The control terminal of the second thin film transistor M2 is electrically connected to the second output terminal VOUT2 of the pressure sensing device 1, the first terminal of the second thin film transistor M2 is electrically connected to the low level signal terminal VGL, and the second terminal of the second thin film transistor M2 is electrically connected to the output terminal of the logic circuit 40.
The control terminal of the third thin film transistor M3 is electrically connected to the first output terminal VOUT1 of the voltage sensing device 1, the first terminal of the third thin film transistor M3 is electrically connected to the output terminal OUT of the logic circuit 40, and the second terminal of the third thin film transistor M3 is electrically connected to the first terminal of the fourth thin film transistor M4.
A control terminal of the fourth thin film transistor M4 is electrically connected to the second output terminal VOUT2 of the voltage sensing element 1, and a second terminal of the fourth thin film transistor M4 is electrically connected to the high-level signal terminal VGH.
Among the thin film transistors, the first thin film transistor M1 and the second thin film transistor M2 are P-type thin film transistors, and are turned on when the control terminal receives a low level signal; the third thin film transistor M3 and the fourth thin film transistor M4 are N-type thin film transistors, and are turned on when the control terminal receives a high level signal. In this way, in the detection stage, when the pressure sensing elements all work normally, the first output terminal VOUT1 and the second output terminal VOUT2 output high level signals, the first thin film transistor M1 and the second thin film transistor M2 are disconnected, the third thin film transistor M3 and the fourth thin film transistor M4 are connected, and the high level signal output by the high level signal terminal VGH is transmitted to the output terminal of the logic circuit 40.
Specifically, the pressure touch display panel further includes a common electrode, as shown in fig. 10, and fig. 10 is a schematic plan view of a pressure touch display panel according to an embodiment of the present invention. The common electrodes 6 are arranged in an array, and the common electrodes 6 are reused as touch electrodes, that is, in the display stage, the common electrodes are used for display, and in the touch stage, the common electrodes are used for touch. At present, the common electrode 6 is mainly tested in a VISUAL TEST mode, that is, a VISUAL display TEST, different voltages are input to enable different common electrodes to display different gray levels, and a checkerboard TEST is performed to detect the common electrode.
Specifically, the test module 5 of the present invention includes a first unit 51 and a second unit 52, and further includes a first signal terminal COMA and a second signal terminal COMB. The test module 5 is located in the third non-display area NAA 3. With reference to fig. 9 and 10, the first input ends of the first unit 51 and the second unit 52 are electrically connected to the touch trace 61, and the touch trace 61 is electrically connected to the common electrode 6 through the via hole. In addition, a second input terminal of the first unit 51 is electrically connected to the first signal terminal COMA, and a second input terminal of the second unit 52 is electrically connected to the second signal terminal COMB.
The specific structures of the first unit 51 and the second unit 52 will now be described in detail. The first unit 51 includes a fifth switch M5, a sixth switch M6, and the second unit 52 includes a seventh switch M7 and an eighth switch M8. A control terminal of the fifth switch M5 is electrically connected to the control terminal COUT of the test module 5, a first terminal of the fifth switch M5 is electrically connected to the touch trace 61, and a second terminal of the fifth switch M5 is electrically connected to the first signal terminal COMA. A control terminal of the sixth switch M6 is electrically connected to the control terminal COUT of the test module 5, a first terminal of the sixth switch M6 is electrically connected to the touch trace 61, and a second terminal of the sixth switch M6 is electrically connected to the first signal terminal COMA.
A control terminal of the seventh switch M7 is electrically connected to the control terminal COUT of the test module 5, a first terminal of the seventh switch M7 is electrically connected to the touch trace 61, and a second terminal of the seventh switch M7 is electrically connected to the second signal terminal COMB. A control terminal of the eighth switch M8 is electrically connected to the control terminal COUT of the test module 5, a first terminal of the eighth switch M8 is electrically connected to the touch trace 61, and a second terminal of the eighth switch M8 is electrically connected to the second signal terminal COMB.
The fifth switch M5, the sixth switch M6, the seventh switch M7 and the eighth switch M8 are all N-type thin film transistors, and when a control terminal of the switch receives a high level signal, the switch is turned on. When the control terminal COUT (i.e., the output terminal of the first logic circuit) of the test module 5 outputs a high level signal, the fifth tft M5, the sixth tft M6, the seventh tft M7 and the eighth tft M8 are all turned on, and the signals of the first signal terminal COMA and the second signal terminal COMB are transmitted to the common electrode 6 through the corresponding units, so as to perform a display test.
In addition, only one switch may be disposed inside the first unit 51 and the second unit 52, for example, a fifth switch M5 is disposed in the first unit 51, a seventh switch M7 is disposed in the second unit 52, and control terminals of the fifth switch M5 and the seventh switch M7 are electrically connected to the control terminal COUT of the test module 5, and a first terminal thereof is electrically connected to the touch electrode 6. The advantage of providing one switch is that the structure is simple and the occupied space is small, and the advantage of providing two switches is that the signal transmission performance is increased. The specific structure of the first unit and the second unit in the present invention is not limited thereto, and any structure capable of implementing the content of the present invention falls within the scope of the present invention.
Specifically, as shown in fig. 11, fig. 11 is a schematic view of a pressure sensing element according to an embodiment of the present invention. The pressure sensing element 1 is a wheatstone bridge type pressure sensor, and comprises a first strain pressure sensor R1, a second strain pressure sensor R2, a third strain pressure sensor R3 and a fourth strain pressure sensor R4, and further comprises a first input terminal VIN1, a second input terminal VIN2, a first output terminal VOUT1 and a second output terminal VOUT 2. The first strain pressure sensor R1 is connected in series between the first input terminal VIN1 and the first output terminal VOUT1, the second strain pressure sensor R2 is connected in series between the second input terminal VIN2 and the second output terminal VOUT2, the third strain pressure sensor R3 is connected in series between the second input terminal VIN2 and the second output terminal VOUT2, and the fourth strain pressure sensor R4 is connected in series between the first input terminal VIN1 and the second output terminal VOUT 2. The wheatstone bridge pressure sensor may be comprised of a metal, wherein the first through fourth strain gauge pressure sensors may be serpentine, which may increase resistance while reducing temperature effects.
In addition, the pressure sensing element 1 may also be a silicon piezoresistive pressure sensor, for example, as shown in fig. 12, fig. 12 is a schematic view of another pressure sensing element provided in an embodiment of the present invention. The center of the pressure sensing element 1 is a silicon chip made of silicon Si, and four sides of the silicon chip are electrically connected to the first input terminal VIN1, the second input terminal VIN2, the first output terminal VOUT1 and the second output terminal VOUT2, respectively. The pressure sensing element 1 has the advantage of small size, and is easily integrated into a touch screen. In addition, the pressure-sensitive element has the advantages of higher strain voltage and automatic temperature compensation, and can be directly made of the same material as the silicon material film layer in the glass substrate in the same manufacturing process, so that one material film manufacturing process can be effectively reduced, the manufacturing process of the array substrate is simplified, and the manufacturing cost is reduced.
The invention also discloses a pressure touch detection method, which is described by taking fig. 7, fig. 9, fig. 10 and fig. 11 as examples. The first switch 31 and the second switch 32 are the first switch M1 and the second switch M2 of the N-type tft logic circuit 40 are P-type tfts, and the third switch M3 and the fourth switch M4 of the logic circuit 40 are N-type tfts.
In the detection phase, the driving circuit (the driving circuit 2 shown in fig. 5) outputs high level signals to the first input terminal VIN1 and the second input terminal VIN2 of the pressure-sensitive element 1, and inputs high level signals to the control terminals of the first switch 31 and the second switch 32. When the pressure sensing device 1 works normally, the high level signals output by the first output terminal VOUT1 and the second output terminal VOUT2 can be transmitted to the logic circuit, and after logical and operation, the output terminal OUT of the logic circuit 40 outputs the high level signal to turn on the first cell 51 and the second cell 52 in the test module 5, so that the test module can perform visual detection (VT test) on the touch electrode 6.
Specifically, in the first stage, a high-level signal is input to the first input terminal VIN1 of the pressure-sensitive element 1, and a fixed potential is input to the second input terminal VIN2 of the pressure-sensitive element 1. When the pressure sensing element 1 works normally, a high potential signal output by the test of the pressure sensing element 1 can turn on the test switch for testing the common electrode 6. When any one of the first strain pressure sensor R1 and the fourth strain pressure sensor R4 has a problem of resistance disconnection, the first output terminal VOUT1 and the second output terminal VOUT2 of the pressure sensing device 1 can only output low level signals, so that the output terminal OUT of the first circuit module 4 outputs low level signals, and the test module 5 cannot be normally turned on.
In the second stage, a fixed potential is input to the first input terminal VIN1 of the pressure-sensitive element 1, and a high-level signal is input to the second input terminal VIN2 of the pressure-sensitive element 1. When the pressure sensing element 1 works normally, a high potential signal output by the test of the pressure sensing element 1 can turn on the test switch for testing the common electrode 6. When any one of the second strain pressure sensor R2 and the third strain pressure sensor R3 has a problem of resistance disconnection, the first output terminal VOUT1 and the second output terminal VOUT2 of the pressure sensing device 1 can only output low level signals, so that the output terminal OUT of the first circuit module 4 outputs low level signals, and the test module 5 cannot be normally turned on.
Through the structural design and the testing method, which part of the strain pressure sensors in the pressure sensing element 1 have problems can be effectively judged, and the reason for the open circuit of the pressure sensing element 1 can be more accurately judged. In addition, the detection of the pressure-sensitive element 1 can save the detection time without increasing the detection end of the frame by multiplexing the conventional visual detection (VT test) of the display panel. Meanwhile, the pressure sensing detection and the touch detection are combined into a whole, so that the labor cost can be reduced.
Fig. 13 is a schematic view of a pressure touch display device according to an embodiment of the present invention, wherein the pressure touch display device has the pressure touch display panel.
The specific structure and principle of the pressure touch display panel have been described in the above embodiments, and are not described herein again. The display panel may be a liquid crystal display panel, an organic light emitting display panel, or a micro light emitting diode display panel.
For example, the display panel is a liquid crystal display panel, the liquid crystal display panel includes an array substrate and a color film substrate which are oppositely arranged, and a liquid crystal layer is arranged between the array substrate and the color film substrate. The array substrate is provided with a plurality of grid lines and a plurality of data lines, the grid lines and the data lines are crossed to define a plurality of sub-pixels, each sub-pixel is correspondingly provided with a pixel electrode and a thin film transistor, the grid electrode of the thin film transistor is connected with the corresponding grid line, the drain electrode of the thin film transistor is connected with the corresponding pixel electrode, the source electrode of the thin film transistor is connected with the corresponding data line, the data line is used for transmitting data signals, the grid line is used for transmitting scanning signals, in the working process of the liquid crystal display panel, the thin film transistors corresponding to the grid lines are sequentially conducted in a row unit under the control of the scanning signals, meanwhile, the data lines sequentially transmit the data signals to the corresponding pixel electrodes so that the pixel electrodes are charged, an electric field is formed between the pixel electrodes and a common electrode to drive liquid crystal in the liquid crystal layer to deflect, so that normal display is realized, and the color film, and a plurality of color resistors arranged in the black matrix opening in an array mode, wherein the color resistors comprise a red color resistor, a green color resistor and a blue color resistor.
For example, the display panel is an Organic Light Emitting display panel, the Organic Light Emitting display panel includes an array substrate, the array substrate includes a plurality of pixel circuits, the Organic Light Emitting display panel further includes a plurality of Organic Light-Emitting diodes (OLEDs) disposed on the array substrate, an anode of each of the Organic Light-Emitting diodes is electrically connected to the pixel circuits on the array substrate, and the plurality of Light-Emitting diodes includes a Light-Emitting Diode for Emitting red Light, a Light-Emitting Diode for Emitting green Light, and a Light-Emitting Diode for Emitting blue Light. In addition, the organic light emitting display panel further includes an encapsulation layer covering the plurality of organic light emitting diodes.
For example, the display panel is a Micro Light-Emitting Diode display panel, the Micro Light-Emitting Diode display panel includes an array substrate, the array substrate includes a plurality of pixel circuits, the Micro Light-Emitting Diode display panel further includes a plurality of Micro Light-Emitting diodes (Mic-LEDs) disposed on the array substrate, an anode of each Micro Light-Emitting Diode is electrically connected to a corresponding pixel circuit on the array substrate, and the plurality of Micro Light-Emitting diodes include a Micro Light-Emitting Diode for Emitting red Light, a Micro Light-Emitting Diode for Emitting green Light, and a Micro Light-Emitting Diode for Emitting blue Light. The micro light-emitting diode can be manufactured on the growth substrate and then transferred to the array substrate in a transfer mode.
The display device may be any electronic device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, or a television.
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 (16)
1. A pressure touch display panel comprises a display area and a non-display area surrounding the display area, wherein the non-display area is provided with at least one pressure sensing element, a switch module, a first circuit module and a test module;
the pressure sensing element is provided with a first output end, a second output end, a first input end and a second input end, one end of the first output end is electrically connected with the driving circuit, and the other end of the first output end is electrically connected with the switch module; one end of the second output end is electrically connected with the driving circuit, and the other end of the second output end is electrically connected with the switch module;
the other end of the switch module is electrically connected with the first circuit module;
the output end of the first circuit module is electrically connected with the control end of the test module and is used for controlling the test module to be opened and closed; when the pressure-sensitive elements all work normally, the signal output by the output end of the first circuit module can conduct the test module for display detection.
2. The pressure touch display panel according to claim 1, wherein the switch module comprises at least one switch unit, the first circuit module comprises at least one logic circuit, and the pressure sensing elements are arranged in one-to-one correspondence with the switch unit and the logic circuit;
the switch unit comprises a first switch and a second switch;
the logic circuit comprises a first input end, a second input end and an output end;
the first switch is electrically connected with a first input end of the logic circuit, and the second switch is electrically connected with a second input end of the logic circuit.
3. The pressure touch display panel of claim 2, wherein the first switch and the second switch are thin film transistor switches;
the first end of the first switch is electrically connected with the first output end, the second end of the first switch is electrically connected with the first output end, and the control end of the first switch is electrically connected with a control line;
the first end of the second switch is electrically connected with the second output end, the second end of the second switch is electrically connected with the second output end, and the control end of the second switch is electrically connected with the control line.
4. The pressure touch display panel according to claim 2, wherein the output terminals of every two of the logic circuits are electrically connected through the logic circuits.
5. The pressure touch display panel according to claim 4, wherein the non-display area has a first non-display area, a second non-display area and a third non-display area, the first non-display area is disposed opposite to the second non-display area, and the third non-display area connects the first non-display area and the second non-display area;
the first non-display area is provided with n pressure-sensitive elements, the corresponding position of the second non-display area is provided with n pressure-sensitive elements, and n is a positive integer.
6. A pressure touch display panel according to claim 5,
the logic circuit comprises n first logic circuits and n-1 second logic circuits;
the output end of the first logic circuit is electrically connected with the first input end of the first logic circuit, and the output end of the second logic circuit is electrically connected with the second input end of the first logic circuit;
the output end of the kth-1 th second logic circuit is electrically connected with the first input end of the kth second logic circuit, and the output end of the (k + 1) th first logic circuit is electrically connected with the second input end of the kth second logic circuit;
the output end of the (n-1) th second logic circuit is electrically connected with the test module;
wherein k is a positive integer less than or equal to n.
7. The pressure touch display panel according to claim 5, wherein the output terminal of the first circuit module located in the first non-display area is electrically connected to the output terminal of the first circuit module located in the second non-display area through the logic circuit;
and the output end of the logic circuit is electrically connected with the test module.
8. The pressure touch display panel according to claim 5, wherein the logic circuit comprises a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a low level signal terminal, and a high level signal terminal;
the control end of the first thin film transistor is electrically connected with the first output end, the first end of the first thin film transistor is electrically connected with the low-level signal end, and the second end of the first thin film transistor is electrically connected with the output end of the logic circuit;
the control end of the second thin film transistor is electrically connected with the second output end, the first end of the second thin film transistor is electrically connected with the low level signal end, and the second end of the second thin film transistor is electrically connected with the output end of the logic circuit;
the control end of the third thin film transistor is electrically connected with the first output end, the first end of the third thin film transistor is electrically connected with the output end of the logic circuit, and the second end of the third thin film transistor is electrically connected with the first end of the fourth thin film transistor;
and the control end of the fourth thin film transistor is electrically connected with the second output end, and the second end of the fourth thin film transistor is electrically connected with the high-level signal end.
9. The pressure touch display panel according to claim 8, wherein the first thin film transistor and the second thin film transistor are P-type thin film transistors, and the third thin film transistor and the fourth thin film transistor are N-type thin film transistors.
10. The pressure touch display panel of claim 1, further comprising a plurality of common electrodes arranged in an array, the common electrodes being multiplexed as touch electrodes; the touch control wires are electrically connected with the common electrodes in a one-to-one correspondence manner;
the test module comprises a first unit, a second unit, a first signal end and a second signal end;
the first input ends of the first unit and the second unit are electrically connected with the touch wire;
the second input end of the first unit is electrically connected with the first signal end;
the second input end of the second unit is electrically connected with the second signal end.
11. The pressure touch display panel according to claim 10, wherein the first unit comprises a fifth switch and a sixth switch, and the second unit comprises a seventh switch and an eighth switch; wherein,
the control end of the fifth switch is electrically connected with the control end of the test module, the first end of the fifth switch is electrically connected with the touch control wiring, and the second end of the fifth switch is electrically connected with the first signal end;
the control end of the sixth switch is electrically connected with the control end of the test module, the first end of the sixth switch is electrically connected with the touch control routing, and the second end of the sixth switch is electrically connected with the first signal end;
the control end of the seventh switch is electrically connected with the control end of the test module, the first end of the seventh switch is electrically connected with the touch-control routing, and the second end of the seventh switch is electrically connected with the second signal end;
the control end of the eighth switch is electrically connected with the control end of the test module, the first end of the eighth switch is electrically connected with the touch control wiring, and the second end of the eighth switch is electrically connected with the second signal end.
12. The pressure touch display panel according to claim 11, wherein the fifth switch, the sixth switch, the seventh switch and the eighth switch are all N-type thin film transistors.
13. The pressure touch display panel according to claim 1, wherein the pressure sensing element is a wheatstone bridge pressure sensor;
the Wheatstone bridge type pressure sensor comprises a first strain pressure sensor, a second strain pressure sensor, a third strain pressure sensor and a fourth strain pressure sensor;
the first strain pressure sensor is connected in series between the first input end and the first output end, the second strain pressure sensor is connected in series between the second input end and the second output end, the third strain pressure sensor is connected in series between the second input end and the second output end, and the fourth strain pressure sensor is connected in series between the first input end and the second output end.
14. The pressure touch display panel of claim 1, wherein the pressure sensing element is a silicon piezoresistive pressure sensor.
15. A pressure touch test method for testing the pressure touch display panel according to any one of claims 1 to 14, comprising:
controlling the switch module to be conducted;
the first stage, inputting high level signal to the first input end of the pressure sensing element, and inputting fixed potential to the second input end of the pressure sensing element;
and in the second stage, a fixed potential is input into the first input end of the pressure sensing element, and a high-level signal is input into the second input end of the pressure sensing element.
16. A pressure touch display device comprising a pressure touch display panel according to any one of claims 1 to 14.
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| CN108227991B (en) * | 2018-01-03 | 2021-06-01 | 厦门天马微电子有限公司 | Display panel, display device and detection method |
| CN108426659B (en) * | 2018-01-03 | 2020-08-25 | 厦门天马微电子有限公司 | Pressure sensor detection circuit and display panel |
| CN108196716B (en) | 2018-01-04 | 2020-08-28 | 厦门天马微电子有限公司 | Display panel, display device and display panel control method |
| CN108597424B (en) * | 2018-01-08 | 2021-03-23 | 厦门天马微电子有限公司 | Display panel, display device and detection method |
| CN108169973B (en) * | 2018-01-12 | 2021-01-05 | 厦门天马微电子有限公司 | Display panel and display device |
| CN109917961B (en) * | 2019-02-28 | 2022-06-24 | 京东方科技集团股份有限公司 | Pressure detection device, display panel and display device |
| CN112885275B (en) * | 2021-01-15 | 2022-09-23 | 云谷（固安）科技有限公司 | Detection circuit and method for display panel |
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| CN105786247A (en) * | 2016-02-24 | 2016-07-20 | 京东方科技集团股份有限公司 | Touch panel and driving method thereof and display device |
| CN105892745A (en) * | 2016-03-31 | 2016-08-24 | 联想(北京)有限公司 | Electronic device and pressure detection method thereof |
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| CN105786247A (en) * | 2016-02-24 | 2016-07-20 | 京东方科技集团股份有限公司 | Touch panel and driving method thereof and display device |
| CN105892745A (en) * | 2016-03-31 | 2016-08-24 | 联想(北京)有限公司 | Electronic device and pressure detection method thereof |
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