CN108196715B - Flexible display device and touch pressure detection method - Google Patents
Flexible display device and touch pressure detection method Download PDFInfo
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- CN108196715B CN108196715B CN201810004255.3A CN201810004255A CN108196715B CN 108196715 B CN108196715 B CN 108196715B CN 201810004255 A CN201810004255 A CN 201810004255A CN 108196715 B CN108196715 B CN 108196715B
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- 238000000034 method Methods 0.000 claims description 15
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- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910001006 Constantan Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- -1 iron-chromium-aluminum Chemical compound 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- 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
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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
- G06F3/0412—Digitisers structurally integrated in a display
Abstract
The invention provides a flexible display device and a touch pressure detection method. The touch sensor can detect the touch position on the flexible display panel, the pressure sensor can detect the initial stress of each position on the flexible display panel and detect the stress of the touch position, so that the processor can determine the initial stress of the touch position in the initial stress of each position on the flexible display panel according to the touch position, calculate the touch pressure of the touch position according to the determined initial stress of the touch position and the received stress of the touch position, correspondingly remove the influence of the initial stress of each position on the flexible display panel on the touch pressure detection, and further improve the accuracy of the touch pressure detection.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display device and a touch pressure detection method.
Background
With the continuous development of display technology, flexible display devices have gained more and more attention due to their advantages of being bendable, light in weight, convenient to carry, and the like. The existing flexible display device comprises a flexible display panel, a touch sensor and a pressure sensor, wherein the touch sensor and the pressure sensor are arranged on the flexible display panel, the touch sensor is used for detecting a touch position on the flexible display panel, and the pressure sensor is used for detecting touch pressure of the touch position.
However, since the flexible display device can be bent, a certain stress is generated at each position of the flexible display device, so that in the process of detecting the touch pressure by the pressure sensor, the stress at each position on the flexible display device easily affects the accuracy of the touch pressure detection, and in different bending states of the flexible display device, the stress generated at each position on the flexible display device is different, thereby being difficult to solve the problem of the influence of the stress at each position on the flexible display device on the touch pressure detection.
Disclosure of Invention
The invention provides a flexible display device and a method for detecting touch pressure, aiming at the defects in the prior art, and at least partially solving the problem that the conventional flexible display device has poor accuracy in detecting the touch pressure.
In order to achieve the above object, the present invention provides a flexible display device, including a processor, a flexible display panel, a pressure sensor and a touch sensor, wherein the processor is connected to the touch sensor and the pressure sensor, the touch sensor is configured to detect a touch position on the flexible display panel, and the pressure sensor is configured to detect an initial stress at each position on the flexible display panel and a stress at the touch position, and send the detected initial stress at each position on the flexible display panel and the detected stress at the touch position to the processor; the processor is used for determining the touch pressure of the touch position according to the initial stress of each position on the flexible substrate and the stress of the touch position.
Preferably, the pressure sensor is arranged on the flexible display panel, the pressure sensor includes a processing unit, a driving unit, a plurality of electrode plates, a plurality of first signal lines parallel to each other and a plurality of second signal lines parallel to each other, the first signal lines and the second signal lines are arranged in a crossing manner and are insulated from each other, a pressure detection unit is arranged between two adjacent first signal lines and two adjacent second signal lines, and the electrode plates are arranged in the pressure detection unit and are connected with the adjacent first signal lines and the adjacent second signal lines in the pressure detection unit;
the driving unit is connected with each first signal line and used for inputting first signals to each first signal line one by one; the processing unit is connected with the second signal lines and used for controlling the driving unit to input first signals to the first signal lines one by one and determining the stress of the electrode plates according to the first signals input by the first signal lines and the second signals output by the second signal lines.
Preferably, the first signal is a first voltage signal, the second signal is a second voltage signal, and the electrode slice is a resistance strain gauge;
the processing unit is specifically configured to determine a resistance value of each electrode pad according to a first voltage signal input by each first signal line and a second voltage signal output by each second signal line, and determine a stress of each electrode pad according to the resistance value of each electrode pad.
Preferably, the pressure sensor further includes an amplifier, and the amplifier is respectively connected to the processing unit and the second signal line, and is configured to amplify the second signal output by the second signal line.
Preferably, the pressure sensor further includes a selector, an input end of the selector is connected to the plurality of second signal lines, and an output end of the selector is connected to the amplifier, and the selector is configured to select to send the second voltage signal on one of the connected second signal lines to the connected amplifier.
Preferably, the pressure sensor is specifically configured to detect an initial stress at each position on the flexible display panel according to a preset period.
The invention also provides a method for detecting touch pressure, which is applied to a flexible display device, wherein the flexible display device comprises a processor, a flexible display panel, a pressure sensor and a touch sensor, the pressure sensor and the touch sensor are arranged on the surface of the flexible display panel, the processor is connected with the touch sensor and the pressure sensor, and the method comprises the following steps:
detecting initial stress of each position on the flexible display panel;
when a touch position on the flexible display panel is detected, detecting stress of the touch position;
and calculating the touch pressure of the touch position according to the initial stress of each position on the flexible display panel and the stress of the touch position.
Preferably, the pressure sensor includes a plurality of electrode pads, a plurality of first signal lines parallel to each other, and a plurality of second signal lines parallel to each other, the first signal lines and the second signal lines are arranged in a crossing manner and insulated from each other, a pressure detection unit is arranged between two adjacent first signal lines and two adjacent second signal lines, and the electrode pads are arranged in the pressure detection unit and connected with the adjacent first signal lines and the adjacent second signal lines in the pressure detection unit;
the detecting of the initial stress of each position on the flexible display panel specifically includes:
inputting a first signal to each first signal line one by one;
and determining the stress of each electrode plate according to the first signal input by each first signal line and the second signal output by each second signal line.
Preferably, the first signal is a first voltage signal, the second signal is a second voltage signal, and the electrode slice is a resistance strain gauge;
the detecting of the initial stress of each position on the flexible display panel specifically includes:
inputting a first voltage signal to each first signal line one by one;
and determining the resistance value of each electrode plate according to the first voltage signal input by each first signal line and the second voltage signal output by each second signal line, and determining the stress of each electrode plate according to the resistance value of each electrode plate.
Preferably, the detecting initial stress at each position on the flexible display panel specifically includes:
and detecting the initial stress of each position on the flexible display panel according to a preset period.
The invention has the following beneficial effects:
the invention provides a flexible display device and a touch pressure detection method. The touch sensor can detect the touch position on the flexible display panel, when the flexible display panel is not touched, the pressure sensor can detect the initial stress of each position on the flexible display panel and send the detected initial stress of each position on the flexible display panel to the processor, when the flexible display panel is touched, the pressure sensor can detect the stress of the touch position and send the detected stress of the touch position to the processor, so that the processor can determine the initial stress of the touch position in the initial stress of each position on the flexible display panel according to the touch position detected by the touch sensor, calculate the touch pressure of the touch position according to the determined initial stress of the touch position and the received stress of the touch position, and accordingly remove the influence of the initial stress of each position on the flexible display panel on the detection of the touch pressure, and then the accuracy of the flexible display device for detecting the touch pressure is improved.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display device provided in embodiment 1;
fig. 2 is a first schematic structural diagram of the pressure sensor provided in embodiment 1;
fig. 3 is a schematic structural diagram of an amplifier provided in embodiment 1;
fig. 4 is a schematic structural diagram ii of the pressure sensor provided in embodiment 1;
fig. 5 is a flowchart of a method for detecting touch pressure according to embodiment 2.
Illustration of the drawings:
1. flexible display panel 2, pressure sensor 21, processing unit 22, driving unit 23, electrode sheet 24, first signal line 25, second signal line 26, pressure detection unit 27, amplifier 28, selector 29, constant value resistor 3, touch sensor
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, a flexible display device and a method for detecting touch pressure provided by the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Embodiment 1 of the present invention provides a flexible display device, as shown in fig. 1, the flexible display device includes a processor, a flexible display panel 1, and a pressure sensor 2 and a touch sensor 3 disposed on a surface of the flexible display panel 1, where the processor is connected to the touch sensor 3 and the pressure sensor 2. The flexible display panel 1 may be an OLED display panel, the flexible display panel 1 includes a flexible substrate 11 and an OLED light emitting device 12 disposed on the flexible substrate 11, and the pressure sensor 2 and the touch sensor 3 may both be located on one side of the OLED light emitting device 12 away from the flexible substrate 11, or one of the pressure sensor and the touch sensor may be located on one side of the OLED light emitting device 12 away from the flexible substrate 11, and the other one of the pressure sensor and the touch sensor is located on one side of the flexible substrate 11 away from the OLED light emitting device 12. In the embodiment of the present invention, the touch sensor 3 is located on one side of the OLED light emitting device 12 away from the flexible substrate 11, and the pressure sensor 2 is located on one side of the flexible substrate 11 away from the OLED light emitting device 12.
The touch sensor 3 is configured to detect a touch position on the flexible display panel 1, the pressure sensor 2 is configured to detect an initial stress and a stress of the touch position at each position on the flexible display panel 1, and send the detected initial stress and the detected stress of the touch position at each position on the flexible display panel 1 to the processor, and the processor is configured to determine a touch pressure at the touch position according to the initial stress and the stress of the touch position at each position on the flexible substrate 1.
Specifically, when the flexible display panel 1 is not touched, the pressure sensor 2 can detect the initial stress at each position on the flexible display panel 1, and send the detected initial stress at each position on the flexible display panel 1 to the processor. When the flexible display panel 1 touches, the pressure sensor 2 can detect the stress at the touch position and send the detected stress at the touch position to the processor. The processor can determine the initial stress of the touch position from the initial stresses of the touch position detected by the touch sensor 3 at each position on the flexible display panel 1, and calculate the touch pressure of the touch position according to the determined initial stress of the touch position and the received stress of the touch position. For example, when the initial stress at the touch position and the stress at the touch position are both compressive stresses (i.e., the touch position is compressed), the touch pressure at the touch position is the difference between the stress at the touch position and the initial stress at the touch position; when the initial stress of the touch position is a tensile stress (i.e. the touch position is stretched), and the stress of the touch position is a compressive stress, the touch pressure of the touch position is the sum of the stress of the touch position and the initial stress of the touch position.
In the flexible display device provided in embodiment 1 of the present invention, when the flexible display panel is not touched, the pressure sensor 2 can detect the initial stress at each position on the flexible display panel 1, and send the detected initial stress at each position on the flexible display panel 1 to the processor, when the flexible display panel is touched, the pressure sensor 2 can detect the stress at the touch position, and send the detected stress at the touch position to the processor, so that the processor can determine the initial stress at the touch position from the initial stress at each position on the flexible display panel 1 according to the touch position detected by the touch sensor 3, and calculate the touch pressure at the touch position according to the determined initial stress at the touch position and the received stress at the touch position, thereby correspondingly removing the influence of the initial stress at each position on the flexible display panel 1 on the detection of the touch pressure, and then the accuracy of the flexible display device for detecting the touch pressure is improved.
Preferably, when the flexible display panel is not touched, the pressure sensor 2 detects the initial stress of each position on the flexible display panel 1 according to a preset period, so that the initial stress of each position on the flexible display panel 1 can be updated according to the period, and the accuracy of the flexible display device in detecting the touch pressure is better improved. It should be noted that, when the flexible display panel is not touched and the flexible display panel 1 is deformed, the pressure sensor 2 may be used to detect the initial stress at each position on the flexible display panel 1, so as to update the initial stress at each position on the flexible display panel 1, but the above-mentioned solution needs to additionally provide a detection device for detecting whether the flexible display panel 1 is deformed.
The touch sensor 3 may be a resistive touch sensor, a capacitive touch sensor or an infrared touch sensor, and those skilled in the art will recognize that any touch sensor 3 capable of determining a touch position is within the scope of the embodiments of the present invention. The structures of the touch sensor 3 and the flexible display panel 1 are the same as those of the prior art, and are not described herein again.
The structure and operation of the pressure sensor 2 will be described in detail below with reference to fig. 1 and 2.
Referring to fig. 1 and 2, the pressure sensor 2 may include a processing unit 21, a driving unit 22, a plurality of electrode pads 23, a plurality of first signal lines 24 parallel to each other, and a plurality of second signal lines 25 parallel to each other, where the first signal lines 24 and the second signal lines 25 are arranged in a crossing manner and are insulated from each other, a pressure detecting unit 26 is arranged between two adjacent first signal lines 24 and two adjacent second signal lines 25, and the electrode pads 23 are arranged in the pressure detecting unit 26 and connected to the adjacent first signal lines 24 and the adjacent second signal lines 25 in the pressure detecting unit 26. The driving unit 22 is connected to each first signal line 24, and is configured to input a first signal to each first signal line 24 one by one, and the processing unit 21 is connected to each second signal line 25, and is configured to control the driving unit 22 to input a first signal to each first signal line 24 one by one, and determine the stress of each electrode pad 23 according to the first signal input by each first signal line 24 and a second signal output by each second signal line 25.
Specifically, embodiment 1 of the present invention will be described by taking as an example that the first signal lines 24 are arranged in the column direction, the second signal lines 25 are arranged in the row direction, and the pressure detection units 26 are arranged in a matrix of 3 rows and 3 columns. The electrode pads 23 in the same row of pressure detecting cells 26 are connected to the same second signal line 25, and the electrode pads 23 in the same column of pressure detecting cells 26 are connected to the same first signal line 24. When the flexible display panel 1 is not touched, the processing unit 21 may control the driving unit 22 to input a first signal to the first signal line 24 located in the first column, and at this time, the processing unit 21 may receive a second signal output by each row of the second signal lines 25, and determine the stress of each electrode pad 23 located in the first column according to the first signal and each second signal. The processing unit 21 may further control the driving unit 22 to input the first signal to the first signal lines 24 of the second row and the third row, and accordingly, may determine the stress of each electrode sheet 23 located on the second row and the third row, respectively, so as to obtain the stress of each electrode sheet 23, that is, obtain the initial stress of each position on the flexible display panel 1.
When the flexible display panel is touched, the processing unit 21 may control the driving unit 22 to input a first signal to the first signal line 24 corresponding to the touch position according to the touch position, and receive a second signal output by the second signal line 25 corresponding to the touch position, so as to determine the stress of the electrode sheet 23 in the touch position, that is, the stress of the touch position. The pressure sensor 2 is simple in structure, and is easy to detect the initial stress of each position on the flexible display panel 1 and the stress of the touch position.
The pressure sensor 2 may be a resistive strain gauge pressure sensor, a semiconductor strain gauge pressure sensor, an inductive pressure sensor, or a resonant pressure sensor. Preferably, the pressure sensor 2 is a resistance strain gauge pressure sensor, which has higher precision and better linear relationship, and can better improve the accuracy of the pressure sensor 2 in detecting the initial stress of each position on the flexible display panel 1 and the stress of the touch position.
As shown in fig. 2, the electrode sheet 23 is a resistance strain gauge, the first signal is a first voltage signal, and the second signal is a second voltage signal. The processing unit 21 may determine the resistance value of each electrode pad 23 according to the first voltage signal input by each first signal line 24 and the second voltage signal output by each second signal line 25, and calculate the stress of each electrode pad 23 according to the resistance value of each electrode pad 23.
Specifically, in the working process of the pressure sensor 2, a preset constant current may be applied to each electrode sheet 23, and when the stress of the electrode sheet 23 changes, the resistance of the electrode sheet 23 changes, so that the difference value between the first voltage signal and the second voltage signal (i.e., the voltage at two ends of the electrode sheet 23) corresponding to the electrode sheet 23 changes, and thus the resistance of the corresponding electrode sheet 23 may be determined according to the first voltage signal and the second voltage signal.
When the electrode sheet 23 generates compressive stress (i.e., the electrode sheet 23 is compressed), the length of the electrode sheet 23 is reduced and the cross-sectional area is increased, which correspondingly reduces the resistance of the electrode sheet 23, and when the electrode sheet 23 generates tensile stress (i.e., the electrode sheet 23 is stretched), the length of the electrode sheet 23 is increased and the cross-sectional area is reduced, which correspondingly increases the resistance of the electrode sheet 23, so that the magnitude and direction of the stress of the electrode sheet 23 can be determined according to the magnitude of the resistance of the electrode sheet 23.
Note that the material of the electrode sheet 23 may include constantan, nickel-aluminum alloy, gamma, or iron-chromium-aluminum alloy.
Preferably, the driving unit 22 is a gate driving chip, and the gate driving chip can sequentially input the first voltage signal to each first signal line 24, and the gate driving chip has a simple structure and is convenient for implementing timing control of each first signal line 24.
Further, as shown in fig. 3 and 4, the pressure sensor 2 may further include an amplifier 27, and the amplifier 27 is connected to the processing unit 21 and the second signal line 25, respectively, for amplifying the second signal output by the second signal line 25.
In particular, the inverting input V of the amplifier 27-A common input terminal V connected to the second signal line 25 and a first terminal of a constant resistor 29+And the output terminal is connected to the second terminal of the processing unit 21 and the fixed resistor 29. The amplifier 27 can amplify the second signal output from the second signal line 25 and send the amplified second signal to the processing unit 21. The processing unit 21 may determine the resistance value of the electrode pad 23 according to the first voltage signal and the amplified second signal, and accordingly may amplify the determined resistance value of the electrode pad 23, i.e. may amplify the response of the electrode pad 23Therefore, the sensitivity of the pressure sensor 2 to the stress detection of the electrode plate 23 can be improved, and the accuracy of the flexible display device to the touch pressure detection is correspondingly and better improved.
Since the voltage at inverting input V-and the voltage at non-inverting input V + of amplifier 27 are both zero and current I1 through electrode pad 23 is equal to current I2 through fixed-value resistor 29, processing unit 21 may calculate the resistance of electrode pad 23 by the following equation:
R1＝(V1*R2)/V2
where R1 is a resistance value of the electrode pad 23, V1 is a first voltage signal input to the first signal line 24, R2 is a resistance value of the fixed resistor 29, and V2 is an amplified second voltage signal output from the second signal line 25.
Further, as shown in fig. 4, the pressure sensor 2 may further include at least one selector 28, an input terminal of the selector 28 is connected to the plurality of second signal lines 25, and an output terminal of the selector 28 is connected to the amplifier 27, for selecting to transmit the second voltage signal on one of the connected second signal lines 25 to the connected amplifier 27.
Specifically, during the operation of the pressure sensor 2, the selector 28 may select one by one to send the second voltage signal on one of the connected second signal lines 25 to the connected amplifier 27. The number of the amplifiers 27 corresponds to the number of the selectors 28 one by one, and the corresponding amplifiers 27 correspond to the plurality of second signal lines 25, so that the number of the amplifiers 27 can be reduced, and the number of the connection ends of the processing unit 21 and the amplifiers 27 can be reduced, thereby simplifying the structure of the pressure sensor 2 and correspondingly reducing the cost of the pressure sensor 2. The embodiment of the present invention is described by taking an example in which the input terminal of the selector 28 is connected to two second signal lines 25, but it is needless to say that the input terminal of the selector 28 is connected to three, four or more second signal lines 25.
Example 2
The method comprises the following steps:
step 1, detecting initial stress of each position on the flexible display panel 1.
Specifically, the initial stress at each position on the flexible display panel 1 may be detected according to a preset period. Therefore, the initial stress of each position on the flexible display panel 1 can be updated according to the period, and the accuracy of the pressure sensor 2 in detecting the initial stress of each position on the flexible display device can be better improved.
The initial stress at each position on the flexible display panel 1 can be detected using the pressure sensor 2. The pressure sensor 2 may include a plurality of electrode pads 23, a plurality of first signal lines 24 parallel to each other, and a plurality of second signal lines 25 parallel to each other, the first signal lines 24 and the second signal lines 25 are disposed in a crossing manner and insulated from each other, a pressure detection unit 26 is disposed between two adjacent first signal lines 24 and two adjacent second signal lines 25, and the electrode pads 23 are disposed in the pressure detection unit 26 and connected to the adjacent first signal lines 24 and the adjacent second signal lines 25 in the pressure detection unit 26.
The detecting of the initial stress at each position on the flexible display panel 1 (i.e. step 1) specifically includes: the first signal is input to each first signal line 24 one by one, and the stress of each electrode pad 31 is determined based on the first signal input to each first signal line 24 and the second signal output from each second signal line 25.
Preferably, the pressure sensor 2 is a resistance strain gauge pressure sensor, the corresponding first signal is a first voltage signal, the corresponding second signal is a second voltage signal, and the electrode plate 23 is a resistance strain gauge. The resistance strain gauge pressure sensor has higher precision and better linear relation, and can better improve the accuracy of the pressure sensor 2 in detecting the initial stress of each position on the flexible display panel 1. Correspondingly, the step of determining the stress of each electrode pad 31 according to the first signal input by each first signal line 24 and the second signal output by each second signal line 25 specifically includes: the resistance value of each electrode pad 23 is determined based on the first voltage signal input from each first signal line 24 and the second voltage signal output from each second signal line 25, and the stress of each electrode pad 23 is determined based on the resistance value of each electrode pad 23.
Further, the step of determining the stress of each electrode pad 31 according to the first signal input by each first signal line 24 and the second signal output by each second signal line 25 specifically includes: the second signal output from each second signal line 25 is amplified, the resistance value of each electrode pad 23 is determined based on the first signal input from each first signal line 24 and the amplified second signal output from each second signal line 25, and the stress of each electrode pad 23 is determined based on the resistance value of each electrode pad 23. In this way, the sensitivity of the pressure sensor 2 to stress detection of the respective electrode pieces 23 can be improved.
And 2, when the touch position on the flexible display panel 1 is detected, detecting the stress of the touch position.
Specifically, the touch sensor 3 may be used to detect a touch position on the flexible display panel 1, and when the touch sensor 3 detects the touch position on the flexible display panel 1, the pressure sensor 2 may be used to detect the stress of the touch position. The detecting the stress of the touch position by using the pressure sensor 2 specifically includes: inputting a first signal to a first signal line 24 corresponding to the touch position; determining the resistance value of the electrode plate 23 in the touch position according to a first signal input by the first signal line 24 corresponding to the touch position and a second signal output by the second signal line 25 corresponding to the touch position, and determining the stress of the touch position according to the resistance value of the electrode plate 23 in the touch position.
And 3, calculating the touch pressure of the touch position according to the initial stress of each position on the flexible display panel 1 and the stress of the touch position.
Specifically, the processor may receive the initial stress and the stress of the touch position at each position on the flexible display panel 1 sent by the pressure sensor 2 and the touch position sent by the touch sensor 3, may determine the initial stress of the touch position from the initial stresses of the touch position at each position on the flexible display panel 1 according to the touch position, and may determine the touch pressure of the touch position according to the determined initial stress of the touch position and the received stress of the touch position.
It should be noted that, the processor may also receive the initial resistance value and the resistance value of the touch position at each position on the flexible display panel 1 sent by the pressure sensor 2, and the touch position sent by the touch sensor 3, and may determine the initial resistance value of the touch position from the initial resistance values of the positions on the flexible display panel 1 according to the touch position, and may find a difference between the determined initial resistance value of the touch position and the received resistance value of the touch position to obtain a resistance change value of the touch position on the flexible display panel 1, and accordingly may determine the touch pressure of the touch position according to the resistance change value of the touch position. The scheme for determining the touch pressure of the touch position does not need to consider the direction of the initial stress for touching each position on the flexible display panel 1 and the direction of the stress of the touch position.
In the method for detecting touch pressure according to embodiment 2 of the present invention, when the flexible display panel 1 is not touched, the initial stress at each position on the flexible display panel 1 is detected, and when the touch position on the flexible display panel 1 is detected, the stress at the touch position is detected, so that the initial stress at the touch position can be determined from the initial stresses at each position on the flexible display panel 1 according to the detected touch position, and the touch pressure at the touch position is calculated according to the determined initial stress at the touch position and the detected stress at the touch position, thereby correspondingly removing the influence of the initial stress at each position on the flexible display panel 1 on the touch pressure detection, and further improving the accuracy of the flexible display device on the touch pressure detection.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A flexible display device comprises a processor, a flexible display panel, a pressure sensor and a touch sensor, wherein the processor is connected with the touch sensor and the pressure sensor, and the touch sensor is used for detecting a touch position on the flexible display panel; the processor is used for determining the touch pressure of the touch position according to the initial stress of each position on the flexible substrate and the stress of the touch position.
2. The flexible display device according to claim 1, wherein the pressure sensor is disposed on the flexible display panel, the pressure sensor includes a processing unit, a driving unit, a plurality of electrode pads, a plurality of first signal lines parallel to each other and a plurality of second signal lines parallel to each other, the first signal lines and the second signal lines are disposed in a crossing manner and insulated from each other, a pressure detection unit is disposed between two adjacent first signal lines and two adjacent second signal lines, and the electrode pads are disposed in the pressure detection unit and connected to the adjacent first signal lines and the adjacent second signal lines in the pressure detection unit;
the driving unit is connected with each first signal line and used for inputting first signals to each first signal line one by one; the processing unit is connected with the second signal lines and used for controlling the driving unit to input first signals to the first signal lines one by one and determining the stress of the electrode plates according to the first signals input by the first signal lines and the second signals output by the second signal lines.
3. The flexible display device according to claim 2, wherein the first signal is a first voltage signal, the second signal is a second voltage signal, and the electrode sheet is a resistance strain gauge;
the processing unit is specifically configured to determine a resistance value of each electrode pad according to a first voltage signal input by each first signal line and a second voltage signal output by each second signal line, and determine a stress of each electrode pad according to the resistance value of each electrode pad.
4. The flexible display device according to claim 2, wherein the pressure sensor further comprises an amplifier, and the amplifier is respectively connected to the processing unit and the second signal line, and is configured to amplify the second signal output by the second signal line.
5. The flexible display device according to claim 4, wherein the pressure sensor further comprises a selector having an input terminal connected to the plurality of second signal lines and an output terminal connected to the amplifier for selecting the second voltage signal on one of the connected second signal lines to be transmitted to the connected amplifier.
6. A method for detecting touch pressure is applied to a flexible display device, the flexible display device comprises a processor, a flexible display panel, a pressure sensor and a touch sensor, the pressure sensor and the touch sensor are arranged on the surface of the flexible display panel, the processor is connected with the touch sensor and the pressure sensor, and the method is characterized by comprising the following steps:
when the flexible display panel is not touched and deformed, detecting initial stress of each position on the flexible display panel according to a preset period;
when a touch position on the flexible display panel is detected, detecting stress of the touch position;
and calculating the touch pressure of the touch position according to the initial stress of each position on the flexible display panel and the stress of the touch position.
7. The method for detecting touch pressure according to claim 6, wherein the pressure sensor includes a plurality of electrode pads, a plurality of first signal lines parallel to each other, and a plurality of second signal lines parallel to each other, the first signal lines and the second signal lines are arranged in a crossing manner and are insulated from each other, a pressure detection unit is arranged between two adjacent first signal lines and two adjacent second signal lines, and the electrode pads are arranged in the pressure detection unit and connected to the adjacent first signal lines and the adjacent second signal lines in the pressure detection unit;
the detecting of the initial stress of each position on the flexible display panel specifically includes:
inputting a first signal to each first signal line one by one;
and determining the stress of each electrode plate according to the first signal input by each first signal line and the second signal output by each second signal line.
8. The method for detecting touch pressure according to claim 7, wherein the first signal is a first voltage signal, the second signal is a second voltage signal, and the electrode pad is a resistance strain gauge;
the detecting of the initial stress of each position on the flexible display panel specifically includes:
inputting a first voltage signal to each first signal line one by one;
and determining the resistance value of each electrode plate according to the first voltage signal input by each first signal line and the second voltage signal output by each second signal line, and determining the stress of each electrode plate according to the resistance value of each electrode plate.
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| CN110044525A (en) * | 2019-04-26 | 2019-07-23 | 西安建筑科技大学 | A kind of flexible resistive dot matrix pressure detecting system, method and apparatus |
| CN112135443B (en) * | 2020-09-22 | 2021-08-24 | 江南大学 | Strain gauge array circuit direct writing printing method based on insulating tape |
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