CN111796712A - Touch device and touch detection method - Google Patents
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- CN111796712A CN111796712A CN202010499822.4A CN202010499822A CN111796712A CN 111796712 A CN111796712 A CN 111796712A CN 202010499822 A CN202010499822 A CN 202010499822A CN 111796712 A CN111796712 A CN 111796712A
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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
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
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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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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Abstract
The invention discloses a touch device and a touch detection method, wherein the touch device comprises a light-emitting component, the light-emitting component comprises a driving substrate, a light-emitting unit and a control unit; the first electrode of the touch device is positioned on one side of the light-emitting unit far away from the substrate; the driving substrate includes a first power supply signal line and a second power supply signal line; the first power supply signal line and/or the second power supply signal line are/is multiplexed as a second electrode of the touch electrode; the first pole of the light-emitting unit is electrically connected with the first power signal wire, and the second pole of the light-emitting unit is electrically connected with the control unit; the first end of the control unit is electrically connected with the second pole of the light-emitting unit, and the second end of the control unit is electrically connected with the second power signal wire; and the touch detection module is electrically connected with the first electrode or the second electrode and is used for judging the touch operation position by detecting the signal change of the first electrode or the second electrode. The touch operation position is judged through the signal change of the first electrode or the second electrode, so that the cost can be reduced, and the touch device is light and thin.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a touch device and a touch detection method.
Background
With the development of technology, more and more display devices have a touch function, and when a touch operation is performed on a display device, an operator touches a display surface of the display device with a finger, and the display device first determines a position of a touch point and then performs a corresponding operation.
The touch display device mainly has two ways to realize pressure touch detection: resistive pressure touch and capacitive pressure touch:
the prior art resistive touch display device generally arranges a strain gauge (i.e. a pressure sensor, the resistance of which changes with the deformation) under the backlight layer or in the surrounding frame of the display device. However, the strain gauge is arranged below the backlight layer, which reduces the sensitivity of pressure detection, and the strain gauge is arranged on the peripheral frame, which increases the frame area of the display device and is not favorable for the development trend of narrow frames of the touch display device;
the integrated pressure sensor in the panel is usually integrated on the array substrate, and a non-display area of the array substrate is difficult to have sufficient space for arranging the pressure sensor because circuit elements such as a display driving circuit and the like need to be arranged;
for the capacitive pressure touch display device, because there is no electrode that can be directly utilized, it is often realized by adding a process or a module structure, and thus the thickness of the display device is also increased.
Therefore, it is an urgent need to solve the technical problem of providing a thin, light and thin touch display device with a narrow frame.
Disclosure of Invention
In view of this, the present invention provides a touch display device and a touch detection method, which can achieve the lightness, thinness and narrow frame of the touch display device.
In one aspect, the invention provides a touch device, which includes a light emitting assembly, the light emitting assembly includes a driving substrate, a light emitting unit located on one side of the driving substrate, and a control unit electrically connected to the light emitting unit, the driving substrate includes a substrate;
the touch device further comprises a first electrode, wherein the first electrode is positioned on one side of the light-emitting unit, which is far away from the substrate base plate;
the driving substrate further includes first and second power supply signal lines located on the substrate adjacent to the light emitting cells; the first power supply signal line and/or the second power supply signal line are/is multiplexed as a second electrode of the touch electrode;
the light emitting unit includes a first pole electrically connected to the first power signal line and a second pole electrically connected to the control unit;
the control unit includes a first terminal electrically connected to the second pole of the light emitting unit and a second terminal electrically connected to the second power signal line;
the touch device further comprises a touch detection module, the touch detection module is electrically connected with the first electrode or the second electrode, and the touch detection module is used for judging a touch operation position by detecting signal changes of the first electrode or the second electrode.
Based on the same inventive concept, the invention also provides a touch detection method of the touch device,
the touch device comprises a light-emitting assembly, the light-emitting assembly comprises a driving substrate, a light-emitting unit and a control unit, the light-emitting unit is positioned on one side of the driving substrate, the control unit is electrically connected with the light-emitting unit, and the driving substrate comprises a substrate;
the touch device further comprises a first electrode, wherein the first electrode is positioned on one side of the light-emitting unit, which is far away from the substrate base plate;
the driving substrate further includes first and second power supply signal lines located on the substrate adjacent to the light emitting cells; the first power supply signal line and/or the second power supply signal line are/is multiplexed as a second electrode of the touch electrode;
the light emitting unit includes a first pole electrically connected to the first power signal line and a second pole electrically connected to the control unit;
the control unit includes a first terminal electrically connected to the second pole of the light emitting unit and a second terminal electrically connected to the second power signal line; the touch device further comprises a touch detection module, and the touch detection module is electrically connected with the first electrode or the second electrode;
the touch device further comprises a touch detection module, and the touch detection module is electrically connected with the first electrode or the second electrode;
the touch detection method comprises the following steps:
when the touch operation occurs, the touch detection module judges the touch operation position by detecting the signal change of the first electrode or the second electrode.
Compared with the prior art, the touch device and the touch detection method provided by the invention at least realize the following beneficial effects:
according to the invention, the first power signal line and/or the second power signal line in the multiplexing light-emitting component are/is used as the second electrode of the touch electrode, and the second electrode of the touch electrode is arranged without adding a manufacturing process or a module structure, so that the touch device is light, thin and narrow in frame;
the touch operation position is judged by detecting the signal change of the first electrode or the second electrode, the detection method is simple, and the detection result precision is high.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a plan view of a touch device provided in the present invention;
FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1;
FIG. 3 is a plan view of another touch device provided in the present invention;
FIG. 4 is a cross-sectional view taken along line B-B' of FIG. 3;
FIG. 5 is a plan view of another touch device provided in the present invention;
FIG. 6 is a plan view of another touch device provided in the present invention;
FIG. 7 is a plan view of another touch device provided in the present invention
FIG. 8 is an equivalent circuit diagram of a light emitting device according to the present invention;
FIG. 9 is an equivalent circuit diagram of another light-emitting device provided by the present invention;
fig. 10 is a schematic structural diagram of a touch detection module according to the present invention;
FIG. 11 is a waveform diagram of the current signal of FIG. 10;
fig. 12 is a schematic structural diagram of another touch detection module provided in the present invention;
fig. 13 is a schematic structural diagram of another touch detection module provided in the present invention;
FIGS. 14 and 15 are timing diagrams before and after the occurrence of the touch of FIG. 13;
FIG. 16 is a further sectional view taken along line A-A' of FIG. 1;
fig. 17 is a flowchart of a touch detection method according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1 to 7, fig. 1 is a plan view of a touch device provided in the present invention, fig. 2 is a cross-sectional view taken along a-a 'direction in fig. 1, fig. 3 is a plan view of another touch device provided in the present invention, and fig. 4 is a cross-sectional view taken along B-B' direction in fig. 3; fig. 5 is a plan view of another touch device provided in the present invention, fig. 6 is a plan view of another touch device provided in the present invention, and fig. 7 is a plan view of another touch device provided in the present invention.
In fig. 1, 3, 5, 6 and 7, the touch device 100 includes a light emitting element 1, the light emitting element includes a driving substrate 2, a light emitting unit 3 located on one side of the driving substrate 2, and a control unit 4 electrically connected to the light emitting unit 3, and the driving substrate 2 includes a substrate 5 (refer to fig. 2 or 4).
The light emitting unit 3 and the control unit 4 may be formed by disposing a circuit layer on the substrate 5 and then electrically connecting them by bonding, or may be formed by forming a film on the substrate 5 and patterning to form a switching device, which is not limited herein. The touch device further includes a first electrode 6, the first electrode 6 is located on a side of the light emitting unit 3 away from the substrate 5, and optionally, the substrate 5 is a glass substrate.
In some optional embodiments, the touch device 100 of the present invention includes a plurality of partitions, each partition includes at least one light emitting unit 3, and optionally, at least one light emitting unit is disposed in each partition in series, or at least one light emitting unit is disposed in each partition in parallel, and the brightness of each partition can be controlled individually. Here, the first electrode 6 may be a block electrode or a full-surface electrode, and fig. 1 and 3 only show that the first electrode 6 is a full-surface electrode, but may also be a block electrode, and referring to fig. 7, the first electrode 6 is a block electrode in fig. 7, and each block electrode is connected to the touch detection module 40, at this time, when the first electrode 6 multiplexes an electrode in the display panel, such as a common electrode, at this time, the first electrode 6 needs to be driven in a time-sharing manner with the display of the display panel.
The driving substrate 2 further includes a first power supply signal line 7 and a second power supply signal line 8 located on the substrate near the light emitting unit 3; the first power signal line 7 and/or the second power signal line 8 are multiplexed as the second electrode 9 of the touch electrode.
Referring to fig. 1, the optional first power signal line 7 includes electrode blocks and traces, where the electrode blocks are multiplexed as touch electrodes, and the second power signal line 8 also includes electrode blocks and traces, where the electrode blocks are multiplexed as touch electrodes. Optionally, the electrode blocks may be ITO, the routing lines may be metal material, and of course, both the electrode blocks and the routing lines may also be IOT, or both may be metal material, which is not specifically limited herein.
It is understood that the first power signal line 7 and the second power signal line 8 in the present invention may not have electrode blocks, but only have metal traces, referring to fig. 6, fig. 6 is a plan view of another touch device provided in the present invention; in fig. 6, only the metal traces are multiplexed as the second electrodes 9, at this time, the touch detection module can detect that there is a touch operation, and does not have a function of determining a touch position, and when the first power signal line 7 and the second power signal line 8 include electrode blocks, the touch position can be accurately determined.
Fig. 1 and 3 show a case where the first power supply signal line 7 is multiplexed as the second electrode 9, and the second power supply signal line 8 may be multiplexed as the second electrode 9. It is understood that when the first power supply signal line 7 is disposed in a different layer from the second power supply signal line 8, a portion close to the first electrode 6 is multiplexed as the second electrode 9. In some alternative embodiments, the first power supply signal line 7 and the second power supply signal line 8 may be multiplexed into the second electrode at the same time, for example, the second power signal line 8 is electrically connected to the touch detection module 40 on the basis of the structure of fig. 1, the purpose of detecting the touch position can be achieved by measuring the signal changes of the first power signal line 7 and the second power signal line 8 at the time, namely, multiplexing the first power signal line 7 and the second power signal line 8 as the second electrode independently, or multiplexing the first power signal line 7 and the second power signal line 8 as the second electrode 9 at the same time as in fig. 3, if the size of the block electrode included in the first power signal line 7 or the block electrode included in the second power signal line 8 is large, in order to ensure the overall touch position detection, the touch detection module 40 is disposed on the first power signal line 7 and the second power signal line 8 at the same time.
Referring to fig. 1 and 3, each block electrode corresponds to at least one light emitting unit 3, in fig. 1, each block electrode corresponds to one light emitting unit 3 as an example, in fig. 3, each block electrode corresponds to 2 light emitting assemblies as an example, and of course, a plurality of light emitting units 3 in each light emitting assembly 1 may be connected in series, which is not limited specifically herein.
Referring to fig. 8, fig. 8 is an equivalent circuit diagram of a light emitting device according to the present invention. In fig. 8, the light emitting unit 3 includes a first pole 31 and a second pole 32, the first pole 31 of which is electrically connected to the first power signal line 7, and the second pole 32 of which is electrically connected to the control unit 4.
The control unit 4 includes a first terminal 42 and a second terminal 43, the first terminal 42 of which is electrically connected to the second pole 32 of the light emitting unit 3, and the second terminal 43 of which is electrically connected to the second power signal line 8.
The touch device 100 further includes a touch detection module 40, wherein the touch detection module 40 is electrically connected to the first electrode 6 or the second electrode 9, and the touch detection module is configured to determine a touch operation position by detecting a signal change of the first electrode 6 or the second electrode 9.
The touch detection module 40 in fig. 1, 3, 5, 6, and 7 is only one possible embodiment, and is not limited in detail.
It is understood that the touch device 100 of the present invention includes a plurality of light emitting units 1, and one or more pixel units (not shown in the drawings) may be covered in each light emitting unit 1, wherein the first electrode 6 may be reused as a common electrode in the touch device, and is not limited herein.
The touch device 100 of the present invention may be a liquid crystal touch device, and has a liquid crystal display panel and a backlight module, the light emitting unit 3 is a light emitting component in the backlight module, and provides a backlight source for the liquid crystal display panel, and the optional light emitting units 3 may be arranged in an array, and the brightness of the light emitting unit 3 can be respectively adjusted according to the displayed content. Of course, the touch device 100 herein may also be an OLED touch device, and the light emitting units 3 are OLED light emitting units arranged in an array. The present invention does not specifically limit the structure of the touch device 100.
The first power signal line 7 may be PVDD or PVEE, and the second power signal line 8 may be PVEE or PVDD, and the first power signal line 7 is PVDD and the second power signal line 8 is PVEE in this embodiment as an example.
It is understood that the touch detection module of the present invention is used for determining the touch operation position by detecting the signal change of the first electrode 6 or the second electrode 9, where the signal may be a current signal or a voltage signal, and is not limited specifically herein. Of course, the touch detection module herein may be connected to the first power signal line 7, the second power signal line 8, or both the first power signal line 7 and the second power signal line 8, and this embodiment is not limited in particular, and only the touch detection module is connected to the first power signal line 7.
The touch detection module may be disposed at any position of the non-display area of the touch device, and is not limited herein.
Referring to fig. 1, only the first power supply signal line 7 is multiplexed as the second electrode 9 in the present embodiment, and in some alternative embodiments, the second power supply signal line 8 may be multiplexed as the second electrode 9, or (referring to fig. 5), the first power supply signal line 7 and the second power supply signal line 8 may be multiplexed as the second electrode 9 at the same time.
It is understood that the first electrode 6 and the second electrode 9 (the multiplexed first power signal line 7 and/or the multiplexed second power signal line 8) have a voltage difference therebetween to form a capacitance, and when a touch operation occurs at a certain position of the touch device, the medium or deformable film layer between the first electrode 6 and the second electrode 9 at the touch position is compressed to deform so that the capacitance between the first electrode 6 and the second electrode 9 changes, when the voltages provided by the first electrode 6 and the second electrode 9 are not changed, the dI-dQ/dt is known from Q-C-V, the charge changes, the change in charge causes a change in current, certainly, the voltage may also change, the touch detection module is electrically connected to the first electrode 6 or the second electrode 9, and the touch detection module can determine the touch operation position by detecting the signal change (current or voltage) of the first electrode 6 or the second electrode 9.
Fig. 2 shows only the case where the first power supply signal line 7 and the second power supply signal line 8 are disposed in the same layer, which enables reduction in thickness of the touch device, and referring to fig. 4, the first power supply signal line 7 and the second power supply signal line 8 are disposed in different layers in fig. 4. The substrate base 5 is not pattern-filled in fig. 2 and 4. When the touch device of the present invention is manufactured, the first power signal line 7 and the second power signal line 8 may be manufactured on the substrate 5, and connection electrodes electrically connected to the light emitting unit 3 and the control unit 4 are reserved, and certainly, connection electrodes electrically connected to the light emitting unit 3 and the control unit 4 are manufactured at the same time, and then the light emitting unit 3 and the first power signal line 7 are electrically connected and the control unit 4 and the second power signal line 8 are electrically connected through a bonding or bonding process, so that the manufacturing method is simple. Of course, an insulating layer 30, which may be an OC glue or PLN, or an insulating layer such as silicon nitride, may be further included between the light emitting unit 3 and the first electrode 6. The insulating layer can not only coat the LED and the MOS to play a role in protection, but also can flatten the insulating effect, and ensure the touch precision.
It should be noted that, in fig. 5, both the first power signal line 7 and the second power signal line 8 are multiplexed as the second electrode 9 of the touch electrode, in fig. 1 and fig. 3, only the first power signal line 7 is multiplexed as the second electrode 9 of the touch electrode, and of course, only the second power signal line 8 may be multiplexed as the second electrode 9 of the touch electrode, and the touch detection principle is the same as that described above, and is not repeated here.
Based on the same idea, the invention further provides a touch detection method of the touch device, and the touch detection method comprises the following steps: when a touch operation occurs, the touch detection module 13 determines the touch operation position by detecting the signal change of the first electrode 6 or the second electrode 9.
Compared with the prior art, the touch device of the embodiment at least has the following beneficial effects:
the touch device of the invention uses the first power signal line 7 and/or the second power signal line 8 of the light-emitting component 1 as the second electrode 9 of the touch electrode, does not need to additionally arrange the touch electrode and does not need to drive in a time-sharing manner with the display stage, can realize the lightness and thinness of the touch device, and simultaneously can not influence the normal display; the touch detection module of the invention can judge the touch operation position by detecting the signal change (current or voltage) of the first electrode 6 or the second electrode 9, the detection result is fast and accurate, and the detection efficiency is improved.
Continuing with fig. 2 and 7. In fig. 7, the control unit 4 further includes a control terminal 41, and the control terminal 41 inputs the pulse width modulation signal.
Referring to fig. 2, fig. 2 shows a connection manner in which the control terminal of the control unit 4 is connected to the pulse width modulation signal when the first power supply signal line 7 and the second power supply signal line 8 are disposed on the same layer, and fig. 1 shows a connection manner in which the control terminal of the control unit 4 is connected to the pulse width modulation signal when the first power supply signal line and the second power supply signal line 8 are disposed on different layers.
In the prior art, the light-emitting unit is controlled by the thin film transistor TFT, but a voltage signal is input to the control terminal of the thin film transistor TFT, and the voltage signal needs to be converted into a current signal when the light-emitting unit is controlled to emit light.
Referring to fig. 9, fig. 9 is an equivalent circuit diagram of another light emitting device according to the present invention. In fig. 9, the control unit 4 comprises a metal oxide semiconductor transistor 10 (i.e. a MOS transistor), a control terminal 101 of which is connected to the PWM signal terminal PWM, a first terminal 102 of which is connected to the second pole 32 of the light emitting unit 3, and a second terminal 103 of which is connected to the second power signal line 8.
It is understood that the brightness of the light emitting unit 3 is controlled by the duration of the PWM signal, and the longer the duration, the greater the brightness.
The invention adopts the metal oxide semiconductor tube 10 to control the brightness of the light-emitting unit 3, replaces the thin film transistor TFT in the prior art, simultaneously, the signal input by the control end 101 of the metal oxide semiconductor tube 10 is a pulse width modulation signal, the brightness of the light-emitting unit 3 is controlled by controlling whether the control unit is conducted or not through the pulse signal, the process of converting voltage into current is not needed, and the reliability of the control circuit is improved.
In some alternative embodiments, with continued reference to fig. 1-11, the lighting unit 3 of the present invention comprises one of a mini-LED or a micro-LED.
The light emitting unit 3 is a micro light emitting diode or a sub-millimeter light emitting diode. The submillimeter LED Mini-LED is a submillimeter LED, and the size of a single LED is about 100 microns. The light-emitting element is a Micro-LED (light-emitting diode), which is a Micro-LED (light-emitting diode) in a Micro and matrix mode, and the LED is subjected to film, Micro and array design, so that the LED can be smaller than 50 micrometers. The size of the light emitting unit 3 is not particularly limited herein.
In some alternative embodiments, with continued reference to fig. 2, 4, the control unit 4 is disposed in the same layer as the light-emitting unit 3.
When the touch device of the present invention is manufactured, the first power signal line 7 and the second power signal line 8 may be manufactured on the substrate 5, and connection electrodes electrically connected to the light emitting unit 3 and the control unit 4 are reserved, and certainly, connection electrodes electrically connected to the light emitting unit 3 and the control unit 4 are manufactured at the same time, and then the light emitting unit 3 and the first power signal line 7 are electrically connected, and the control unit 4 and the second power signal line 8 are electrically connected through a bonding process, so that the manufacturing method is simple.
In some alternative real-time modes, the first power supply signal line 7 and the second power supply signal line 8 are disposed in the same layer, or the first power supply signal line 7 and the second power supply signal line 8 are disposed in different layers.
In fig. 1 and 2, the first power signal line 7 and the second power signal line 8 are disposed on the same layer, and the first power signal line 7 and the second power signal line 8 are disposed on the same layer, which enables the touch device to be light and thin.
In fig. 3 and 4, the first power supply signal line 7 and the second power supply signal line 8 are disposed in different layers, wherein the first power supply signal line 7 is disposed on the side of the second power supply signal line 8 close to the first electrode, and an insulating layer is provided between the first power supply signal line 7 and the second power supply signal line 8, and when the first power supply signal line 7 and the second power supply signal line 8 are disposed in different layers, the first power supply signal line 7 and the second power supply signal line 8 can be disposed with a sufficient space, and the area of the first power supply signal line 7 and the second power supply signal line 8 is relatively large, and at this time, the resistances of the first power supply signal line 7 and the second power supply signal line 8 themselves are reduced, whereby the power consumption of the first power supply signal line 7 and the second power supply signal line 8 can be reduced.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a touch detection module provided in the present invention, and fig. 11 is a waveform diagram of a current signal in fig. 10. In fig. 10, the first power signal line 7 and the second power signal line input direct current signals, the touch detection module 13 includes a detection circuit 14 and a first signal processing unit 15, the detection circuit 14 is electrically connected to amplify a current signal of the first electrode and/or the second electrode, and the first signal processing unit 15 is configured to process the amplified current signal to calculate and determine a touch operation position.
In fig. 10, the first power signal line 7 is connected to the power input terminal 12 to supply a constant voltage signal to the first power signal line 7.
In the embodiment, only the case where the touch detection module 13 is connected to the second electrode 9 is shown.
It is understood that, in conjunction with fig. 1 and 2, a voltage difference between the first electrode 6 and the second electrode 9 (the multiplexed first power signal line 7 and/or the multiplexed second power signal line 8) forms a capacitance, and when a touch operation occurs at a certain position of the touch device, the medium or deformable film layer between the first electrode 6 and the second electrode 9 at the touch position is compressed to deform so that the capacitance between the first electrode 6 and the second electrode 9 changes, when the voltages provided by the first electrode 6 and the second electrode 9 are not changed, the dI-dQ/dt is known from Q-C-V, the charge changes, the change in charge causes a change in current, certainly, the voltage may also change, the touch detection module is electrically connected to the first electrode 6 or the second electrode 9, and the touch detection module can determine the touch operation position by detecting the current signal change of the first electrode 6 or the second electrode 9.
The first signal processing unit 15 in this embodiment may be a central processing unit CPU, or other software capable of processing the current signal and calculating and determining the touch position.
Referring to fig. 11, when no touch occurs, the current signal does not change, the waveform of the current is flat, and when a touch operation occurs, the current signal increases, that is, the waveform of the current has a peak, as shown in fig. 11, so that the touch position can be determined.
In the touch device of this embodiment, the detection circuit 14 is configured to amplify a current signal of the first electrode and/or the second electrode by inputting a dc signal to the first power signal line 7 and the second power signal line, and the first signal processing unit 15 is configured to process and calculate the amplified current signal and determine the touch operation position, so that the detection method is fast and direct, and the touch operation position can be accurately determined.
Referring to fig. 12, fig. 12 is a schematic structural diagram of another touch detection module provided in the present invention. The detection circuit 14 in fig. 12 comprises a first resistor R, an amplifier 16 and a comparator 17, wherein,
the first resistor R has a first terminal connected to the power input terminal 12 and a second terminal connected to the second electrode 9;
the amplifier 16 has a first input terminal connected to the power input terminal 12, a second input terminal connected to the second terminal of the first resistor R, and an output terminal connected to the comparator 17;
the comparator 17 has a first input terminal connected to the output terminal of the amplifier 16, a second input terminal connected to the reference voltage signal terminal Vref, and an output terminal connected to the first signal processing unit 15.
In this embodiment, the power input terminal 12 provides a constant voltage for the touch detection module 13 and the second electrode 9, when no touch occurs and the power input terminal 12 inputs a constant voltage to the second electrode 9, currents at the first node N1 and the second node N2 at two ends of the first resistor R are I and I ', respectively, at this time, since no touch occurs and the charge at the second electrode 9 is not increased, I and I' are equal, so that the current signals input by the first input terminal and the second input terminal of the amplifier 16 are substantially the same, the output signal does not change the waveform, so that the signal input to the first input terminal of the comparator 17 is unchanged compared with the signal at the reference voltage signal terminal Vref, and the current waveform output by the comparator 17 is a straight line; when a touch occurs and the power input terminal 12 inputs a constant voltage to the second electrode 9, the currents at the first node N1 and the second node N2 at the two ends of the first resistor R are I and I ', respectively, when a touch occurs, the voltages provided by the first electrode 6 and the second electrode 9 are not changed, and dI ═ dQ/dt is known from Q ═ C ═ V, and the charge changes, so that the change of the current is caused, and the current I at the first node N1 is not equal to the current I ' at the second node N2, when the current I and the current I ' pass through the amplifier 16, the change of the current signal is amplified, and after the change of the current I is compared with the signal at the reference voltage signal terminal Vref and output, the current waveform has a peak, the first signal processing unit 15 processes and calculates the amplified current signal and determines the touch operation position, so as to accurately determine the touch operation position, the detection method is rapid and direct.
Referring to fig. 5, 13, 14 and 15, fig. 13 is a schematic structural diagram of another touch detection module provided by the present invention, and fig. 14 and 15 are timing diagrams before and after the touch of fig. 13 occurs. In fig. 13, the first power signal line 7 and the second power signal line 8 input pulse signals, the touch detection module 13 includes a second signal processing unit 18, and the second signal processing unit 18 is electrically connected to the first electrode or the second electrode 9 and is configured to determine a touch operation position by detecting a change of the pulse signal of the first electrode or the second electrode when a touch operation occurs.
Note that the second signal processing unit 18 may be a driver chip IC at this time, and the driver chip IC detects a change in the pulse signal.
Based on the same idea, the invention also provides a touch detection method, which comprises the following steps: when a touch operation occurs, the touch detection module 13 determines the touch operation position by detecting a change of the pulse signal of the first electrode 6 or the second electrode 9.
In the embodiment, only the case where the touch detection module 13 is connected to the second electrode 9 is shown.
Fig. 14 is a timing chart when no touch operation occurs, and fig. 15 is a timing chart when a touch operation occurs.
It is to be understood that, in fig. 5, the signals inputted to the first power supply signal line 7 and the second power supply signal line 8 are pulse signals, and the pulse width modulation signal inputted to the pulse width modulation signal terminal PWM is inputted to the control unit 4, where the timings of the pulse signals inputted to the first power supply signal line 7 and the second power supply signal line 8 are completely synchronized, and the voltage difference between the first power supply signal line 7 and the second power supply signal line 8 is a constant value. In fig. 14, when no touch occurs, the waveforms of the signals at the third node N3 and the fourth node N4 are still square signals because the charge at the second electrode 9 is unchanged; when a touch occurs, the voltage signal changes due to the change of the charge at the second electrode 9, so the signal waveform when the touch occurs is as shown in fig. 15, and the touch detection module 13 can determine the position of the touch operation by measuring the delay time of the signal waveform.
With continued reference to fig. 13 and 14, the first voltage V1 is provided to the control terminal of the control unit 4, and the second voltage V2 is provided to the first power signal line 7, wherein the difference between V1 and V2 is greater than the threshold voltage of the control unit 4.
The difference between the high level of the PWM signal terminal and the high level of the second voltage provided by the first power signal line 7 is greater than the threshold voltage Vth of the MOS/TFT, i.e. V1-V2 is greater than Vth, at this time, the control unit 4 can be turned on, the light-emitting unit 3 can emit light after the control unit 4 is turned on, when the touch operation occurs, the touch detection module 13 determines the position of the touch operation by determining the delay time of the signal waveform of the third node N3 or N4, and the detection method of the embodiment is fast and has accurate detection result.
With continued reference to fig. 13 and 14, the second signal processing unit 18 determines the touch operation position by detecting the delay time of the rising edge or the falling edge of the pulse signal of the first electrode or the second electrode 9 when the touch operation occurs.
Fig. 13 shows only the case where the second signal processing unit 18 is connected to the second electrode 9, but may be electrically connected to the first electrode, and is not particularly limited herein.
As can be seen from fig. 15, when a touch operation occurs, a rising edge or a falling edge of the pulse signal is delayed, and the second processing unit 18 can determine the touch operation position by determining the delay time of the rising edge or the falling edge of the pulse signal.
With continued reference to fig. 13 and 15, when the touch operation position is determined, the luminance of the light emitting unit 3 at the touch operation position is changed by changing the voltage input to the first power supply signal line 7 or changing the voltage input to the second power supply signal line 8.
It is understood that the brightness may be changed to increase the brightness or decrease the brightness, and is not limited in particular.
Based on the same idea, the present invention further provides a touch detection method, referring to fig. 17, where fig. 17 is a flowchart of the touch detection method provided by the present invention, and the touch detection method in fig. 17 includes the following steps:
s1: the touch control detection module judges the touch control operation position by detecting the change of the pulse signal of the first electrode or the second electrode;
s2: when the touch operation position is determined, the luminance of the light emitting unit at the touch operation position is changed by changing the voltage input to the first power supply signal line or changing the voltage input to the second power supply signal line.
Since the brightness of the light-emitting unit 3 at the touch operation position is adjusted after the touch operation is performed, the touch position can be visually displayed through the brightness change.
In some alternative embodiments, with continued reference to fig. 13, increasing the voltage input to the first power supply signal line 7 or decreasing the voltage input to the second power supply signal line 8 increases the luminance of the light emitting unit 3 at the touch operation position;
either decreasing the voltage input to the first power supply signal line 7 or increasing the voltage input to the second power supply signal line 8 decreases the luminance of the light emitting unit 8 at the touch operation position.
Based on the same idea, the present invention further provides a method for detecting a touch device, including the steps of determining a touch operation position by detecting a change in a pulse signal of the first electrode 6 or the second electrode 9 by the touch detection module 13, and changing the brightness of the light emitting unit at the touch operation position by changing the voltage input to the first power signal line or changing the voltage input to the second power signal line after determining the touch operation position, specifically:
increasing the voltage input to the first power supply signal line or decreasing the voltage input to the first power supply signal line increases the luminance of the light emitting unit at the touch operation position;
either reducing the voltage input to the first power supply signal line or increasing the voltage input to the second power supply signal line lowers the luminance of the light emitting unit at the touch operation position.
The difference between the voltage input to the first power signal line 7 and the voltage input to the second power signal line 8 can adjust the luminance of the light emitting unit 3, the luminance of the light emitting unit 3 at the touch operation position can be increased when the voltage input to the first power signal line 7 is increased or the voltage input to the second power signal line 8 is decreased, and the luminance of the light emitting unit 8 at the touch operation position can be decreased when the voltage input to the first power signal line 7 is decreased or the voltage input to the second power signal line 8 is increased. The touch position can be visually displayed by increasing the brightness of the light-emitting unit 3; the brightness of the light-emitting unit 3 is reduced, so that the touch position can be visually displayed, and the power consumption of touch operation can be reduced.
Referring to fig. 16, fig. 16 is a further sectional view taken along line a-a' of fig. 1. The touch device further comprises a display panel 19, and the display panel 19 comprises the first electrode 6.
The display panel 19 may be a liquid crystal display panel, and the display panel 19 in fig. 16 further includes a pixel electrode 21, and the first electrode 6 is a first electrode 6 separately disposed in the display panel 19, or may be multiplexed as a common electrode 20 in the display panel 19, which is not limited herein.
The thickness of the touch device can be reduced by multiplexing the first electrodes 6 in the display panel 19, which is beneficial to thinning.
As can be seen from the above embodiments, the touch device and the touch detection method provided by the present invention at least achieve the following beneficial effects:
according to the invention, the first power signal line and/or the second power signal line in the multiplexing light-emitting component are/is used as the second electrode of the touch electrode, and the second electrode of the touch electrode is arranged without adding a manufacturing process or a module structure, so that the touch device is light, thin and narrow in frame;
the touch operation position is judged by detecting the signal change of the first electrode or the second electrode, the detection method is simple, and the detection result precision is high.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (19)
1. The touch device is characterized by comprising a light-emitting assembly, wherein the light-emitting assembly comprises a driving substrate, a light-emitting unit and a control unit, the light-emitting unit is positioned on one side of the driving substrate, the control unit is electrically connected with the light-emitting unit, and the driving substrate comprises a substrate;
the touch device further comprises a first electrode, wherein the first electrode is positioned on one side of the light-emitting unit, which is far away from the substrate base plate;
the driving substrate further includes first and second power supply signal lines located on the substrate adjacent to the light emitting cells; the first power supply signal line and/or the second power supply signal line are/is multiplexed as a second electrode of the touch electrode;
the light emitting unit includes a first pole electrically connected to the first power signal line and a second pole electrically connected to the control unit;
the control unit includes a first terminal electrically connected to the second pole of the light emitting unit and a second terminal electrically connected to the second power signal line;
the touch device further comprises a touch detection module, the touch detection module is electrically connected with the first electrode or the second electrode, and the touch detection module is used for judging a touch operation position by detecting signal changes of the first electrode or the second electrode.
2. The touch device of claim 1, wherein the control unit further comprises a control terminal, and the control terminal inputs a pulse width modulation signal.
3. The touch device of claim 2, wherein the control unit comprises a Metal Oxide Semiconductor (MOS) transistor, a control terminal of the MOS transistor is connected to the PWM signal terminal, a first terminal of the MOS transistor is connected to the second electrode of the light emitting unit, and a second terminal of the MOS transistor is connected to the second power signal line.
4. The touch device of claim 1, wherein the light emitting unit comprises one of a mini-LED or a micro-LED.
5. The touch device of claim 1, wherein the control unit and the light emitting unit are disposed on the same layer.
6. The touch device according to claim 1, wherein the first power supply signal line and the second power supply signal line are disposed in a same layer, or wherein the first power supply signal line and the second power supply signal line are disposed in different layers.
7. The touch device according to claim 1, wherein the first power signal line and the second power signal line are input with direct current signals, the touch detection module comprises a detection circuit and a first signal processing unit, the detection circuit is electrically connected to the detection circuit, the detection circuit is configured to amplify a current signal of the first electrode and/or the second electrode, and the first signal processing unit is configured to process the amplified current signal, calculate and determine a touch operation position.
8. The touch device of claim 7, wherein the detection circuit comprises a first resistor, an amplifier, and a comparator, wherein,
the first resistor is provided with a first end and a second end, the first end of the first resistor is connected to the power supply input end, and the second end of the first resistor is connected to the second electrode;
the amplifier is provided with a first input end, a second input end and an output end, wherein the first input end of the amplifier is connected to the power supply input end, the second input end of the amplifier is connected to the second end of the first resistor, and the output end of the amplifier is connected to the comparator;
the comparator has a first input terminal connected to the output terminal of the amplifier, a second input terminal connected to a reference voltage signal terminal, and an output terminal connected to the first signal processing unit.
9. The touch device according to claim 2, wherein the first power signal line and the second power signal line are input with pulse signals, and the touch detection module comprises a second signal processing unit electrically connected to the first electrode or the second electrode for determining a touch operation position by detecting a change in the pulse signal of the first electrode or the second electrode when a touch operation occurs.
10. The touch device of claim 9, wherein a first voltage V1 is provided to the control terminal of the control unit, and a second voltage V2 is provided to the first power signal line, wherein the difference between V1 and V2 is greater than the threshold voltage of the control unit.
11. The touch device of claim 9, wherein the second signal processing unit determines the touch operation position by detecting a delay time of a rising edge or a falling edge of the pulse signal of the first electrode or the second electrode when the touch operation occurs.
12. The touch device according to claim 9, wherein when the touch operation position is determined, the luminance of the light-emitting unit at the touch operation position is changed by changing a voltage input to the first power signal line or changing a voltage input to the second power signal line.
13. The touch device according to claim 12, wherein increasing the voltage input to the first power signal line or decreasing the voltage input to the second power signal line increases luminance of the light-emitting unit at a touch operation position;
or decreasing the voltage input to the first power supply signal line or increasing the voltage input to the second power supply signal line decreases the luminance of the light emitting unit at the touch operation position.
14. The touch device of claim 1, further comprising a display panel, the display panel comprising the first electrode.
15. A touch detection method of a touch device is characterized in that,
the touch device comprises a light-emitting assembly, the light-emitting assembly comprises a driving substrate, a light-emitting unit and a control unit, the light-emitting unit is positioned on one side of the driving substrate, the control unit is electrically connected with the light-emitting unit, and the driving substrate comprises a substrate;
the touch device further comprises a first electrode, wherein the first electrode is positioned on one side of the light-emitting unit, which is far away from the substrate base plate;
the driving substrate further includes first and second power supply signal lines located on the substrate adjacent to the light emitting cells; the first power supply signal line and/or the second power supply signal line are/is multiplexed as a second electrode of the touch electrode;
the light emitting unit includes a first pole electrically connected to the first power signal line and a second pole electrically connected to the control unit;
the control unit includes a first terminal electrically connected to the second pole of the light emitting unit and a second terminal electrically connected to the second power signal line; the touch device further comprises a touch detection module, and the touch detection module is electrically connected with the first electrode or the second electrode;
the touch device further comprises a touch detection module, and the touch detection module is electrically connected with the first electrode or the second electrode;
the touch detection method comprises the following steps:
when the touch operation occurs, the touch detection module judges the touch operation position by detecting the signal change of the first electrode or the second electrode.
16. The touch detection method according to claim 15, wherein the first power signal line and the second power signal line are input with direct current signals, and the touch detection module includes a detection circuit and a first signal processing unit that are electrically connected;
the detection circuit amplifies a current signal of the first electrode or the second electrode;
the first signal processing unit processes and calculates the amplified current signal and judges a touch operation position.
17. The touch detection method according to claim 15, wherein the control unit further comprises a control terminal connected to a pwm signal terminal, the pwm signal terminal providing a pwm signal;
the first power supply signal line and the second power supply signal line input pulse signals;
the touch detection module comprises a second signal processing unit which is electrically connected with the first electrode or the second electrode;
the touch detection method comprises the step that when touch operation occurs, the touch detection module judges the touch operation position by detecting the change of a pulse signal of the first electrode or the second electrode.
18. The touch detection method according to claim 17, wherein after the touch operation position is determined, the luminance of the light emitting unit at the touch operation position is changed by changing a voltage input to the first power signal line or changing a voltage input to the second power signal line.
19. The touch detection method according to claim 18, wherein changing the luminance of the light-emitting unit at the touch operation position by changing the voltage input to the first power supply signal line or changing the voltage input to the second power supply signal line comprises:
increasing the voltage input to the first power supply signal line or decreasing the voltage input to the first power supply signal line increases the luminance of the light emitting unit at the touch operation position;
or decreasing the voltage input to the first power supply signal line or increasing the voltage input to the second power supply signal line decreases the luminance of the light emitting unit at the touch operation position.
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