CN106383607B - Touch display system with pressure sensing - Google Patents
Touch display system with pressure sensing Download PDFInfo
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- CN106383607B CN106383607B CN201610799581.9A CN201610799581A CN106383607B CN 106383607 B CN106383607 B CN 106383607B CN 201610799581 A CN201610799581 A CN 201610799581A CN 106383607 B CN106383607 B CN 106383607B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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Abstract
The invention provides a touch display system with pressure sensing, which comprises a touch sensing layer and a display module, wherein the display module further comprises a conductive shielding layer, the touch sensing layer is arranged on the display module and is insulated from the conductive shielding layer, and the conductive shielding layer is used for providing pressure sensing in a first time sequence and providing grounding for the display module in a second time sequence. By adopting the touch display system with pressure sensing provided by the invention, the pressure sensing function can be realized in the touch display system without arranging a plurality of pressure sensing layers, the pressure sensing structure can be simplified, and the cost is reduced.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of touch display, and in particular, to a touch display system with pressure sensing.
[ background of the invention ]
Touch display panels are widely used in various consumer electronic devices, such as: portable electronic products such as smart phones, tablet computers, cameras, electronic books, MP3 players, etc., or display screens for operating control devices. In recent years, a touch display panel capable of sensing the magnitude of a pressing force (also referred to as three-dimensional touch sensing) has attracted much attention.
In the prior art, a pressure sensor is usually added to the structure to achieve the pressure sensing function. However, the pressure sensor generally includes a supporting substrate and a pressure sensing electrode layer formed on the supporting substrate, and the pressure sensor is attached to the touch display panel by an attaching method. Therefore, integrating the pressure sensing function into the touch display panel will increase the overall thickness of the touch display panel and increase the cost. Therefore, a new solution for integrating pressure sensing technology is needed to overcome the problems of increased thickness and high cost of the conventional touch display panel with pressure sensing.
[ summary of the invention ]
The invention provides a touch display system with pressure sensing, which utilizes an existing conductive shielding layer in a display module as a pressure sensing electrode layer and is matched with a switching design of the operating state of the conductive shielding layer to realize a pressure sensing function.
The invention provides the following technical scheme for solving the technical problems: a touch display system with pressure sensing comprises a touch sensing layer and a display module, wherein the display module further comprises a conductive shielding layer, the touch sensing layer is arranged on the display module and is arranged in an insulated manner with the conductive shielding layer, and the conductive shielding layer is used for providing pressure sensing in a first time sequence and providing grounding for the display module in a second time sequence.
Preferably, the touch sensing layer includes a first axial electrode and a second axial electrode intersecting and insulated from the first axial electrode.
Preferably, the touch sensing device comprises a control unit, wherein the control unit is electrically connected with the touch sensing layer and the conductive shielding layer and controls the operation states of the touch sensing layer and the conductive shielding layer in a time-sharing manner.
Preferably, at a first timing, the control unit controls the first axial electrode and the second axial electrode to be in a floating state, and senses a pressure sensing signal generated by a background capacitance between the conductive shielding layer and a ground terminal; at a second time sequence, the control unit provides a driving signal to the first axial electrode, senses a touch sensing signal generated by a capacitance between the second axial electrode and the first axial electrode, and controls the conductive shielding layer to be in a grounding state.
Preferably, the control unit includes a driving circuit module, a touch sensing circuit module, a pressure sensing circuit module and a plurality of circuit switches, wherein the driving circuit module is electrically connected to the first axial electrode through the circuit switches, the touch sensing circuit module is electrically connected to the second axial electrode through the circuit switches, and the pressure sensing circuit module is electrically connected to the conductive shielding layer through the circuit switches.
Preferably, the control unit further includes a signal control module electrically connected to the plurality of circuit switches and configured to control a connection state of each of the circuit switches.
Preferably, in a first timing, the signal control module controls the circuit switches connected to the first axial electrode and the second axial electrode to be in floating connection, and controls the circuit switches connected to the conductive shielding layer to be conducted to the pressure sensing circuit module; and at a second time sequence, the signal control module controls the circuit switch connected with the first axial electrode to be conducted on the driving circuit module, controls the circuit switch connected with the second axial electrode to be conducted on the touch sensing circuit module, and controls the circuit switch connected with the conductive shielding layer to be grounded.
Preferably, at a first timing, the control unit provides a driving signal to the first axial electrode, and senses a touch sensing signal generated by a capacitance between the second axial electrode and the first axial electrode, and senses a pressure sensing signal generated by a capacitance between the conductive shielding layer and the first axial electrode; at a second timing, the control unit provides the driving signal to the first axial electrode, senses the touch sensing signal generated by the capacitance between the second axial electrode and the first axial electrode, and controls the conductive shielding layer to be in a grounded state.
Preferably, the control unit includes a driving circuit module, a touch sensing circuit module, a pressure sensing circuit module and a plurality of circuit switches, wherein the driving circuit module is electrically connected to the first axial electrode through the circuit switches, the touch sensing circuit module is electrically connected to the second axial electrode through the circuit switches, and the pressure sensing circuit module is electrically connected to the conductive shielding layer through the circuit switches.
Preferably, the control unit further includes a signal control module electrically connected to the circuit switches and configured to control a connection state of each circuit switch.
Preferably, at a first timing, the signal control module controls the circuit switch connected to the first axial electrode to be conducted to the driving circuit module, controls the circuit switch connected to the second axial electrode to be conducted to the touch sensing circuit module, and controls the circuit switch connected to the conductive shielding layer to be conducted to the pressure sensing circuit module; and at a second time sequence, the signal control module controls the circuit switch connected with the first axial electrode to be conducted on the driving circuit module, controls the circuit switch connected with the second axial electrode to be conducted on the touch sensing circuit module, and controls the circuit switch connected with the conductive shielding layer to be grounded.
Preferably, the control unit includes a driving circuit module, a touch sensing circuit module, a pressure sensing circuit module and a plurality of circuit switches, wherein the driving circuit module is electrically connected to the first axial electrode, the touch sensing circuit module is electrically connected to the second axial electrode, and the pressure sensing circuit module is electrically connected to the conductive shielding layer through the circuit switches.
Preferably, the control unit further includes a signal control module electrically connected to the circuit switches and configured to control a connection state of each circuit switch.
Preferably, in a first timing sequence, the signal control module controls the circuit switch connected to the conductive shielding layer to be conducted to the pressure sensing circuit module; and at a second time sequence, the signal control module controls the circuit switch connected with the conductive shielding layer to be grounded.
Preferably, the conductive shielding layer is a conductive layer with a patterned structure or a conductive layer with a complete planar structure.
In summary, the touch display system with pressure sensing provided by the invention utilizes the existing conductive shielding layer in the display module as the pressure sensing layer, and performs time-sharing scanning by matching with the switching design of the operating state of the conductive shielding layer, thereby realizing the pressure sensing function without affecting the function of the display module. Therefore, compared with the prior art, the touch control display system can realize the pressure sensing function in the touch control display system without arranging a plurality of pressure sensing layers, simplify the pressure sensing structure and reduce the cost.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of a touch display panel provided in the present invention.
Fig. 2 is a schematic diagram of a frame of a touch display system with pressure sensing according to a first embodiment of the invention.
Fig. 3 is a block diagram of a control unit in the touch display system with pressure sensing shown in fig. 2.
Fig. 4 is a schematic diagram of an equivalent capacitance of the touch display system with pressure sensing shown in fig. 2.
FIG. 5 is a block diagram of another embodiment of a control unit in the touch display system with pressure sensing shown in FIG. 3.
Fig. 6 is a schematic structural diagram of a touch display system with pressure sensing according to a second embodiment of the invention.
Fig. 7 is a schematic structural diagram of a modified embodiment of a touch display system with pressure sensing according to a second embodiment of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a touch display panel 90 is provided, in which the touch display panel 90 includes a cover 901, a touch sensing layer 902 and a display module 120 sequentially disposed from top to bottom. The touch sensing layer 902 is used for detecting a touch position, and the touch sensing layer 902 may be attached to the cover 901 by an optical adhesive (not shown), or may be formed on the surface of the cover 901 by directly using a photolithography process, which is not limited in this embodiment. Then, the cover 901 integrated with the touch sensing layer 902 is attached to the display module 120 by another optical adhesive (not shown).
The display module 120 of the present embodiment may be, for example, an In-plane switching (IPS) display panel, which is sequentially disposed with an upper polarizer 903, a conductive shielding layer 904, a color filter layer 905, a liquid crystal layer 907, a tft device layer 908, a substrate 909, a lower polarizer 910, and a backlight 911 from top to bottom. It is understood by those skilled in the art that the structure of the display panel 120 is not limited to the present embodiment, and any display panel structure including the conductive shielding layer 904 is within the scope of the present invention.
In the present invention, the conductive shielding layer 904 of the display module 120 is used to perform time-sharing scanning by switching the operation state, and the conductive shielding layer 904 is designed to have the functions of grounding the display module 120 and sensing the pressure of the touch display system 90. It should be noted that the conductive shielding layer 904 of the display module 120 is used to eliminate the charges accumulated on the surface of the display module 120 when being grounded, and reduce the electrostatic interference of the external environment, so as to avoid affecting the display effect of the display module 120.
Referring to fig. 2, a touch display system 10 with pressure sensing according to a first embodiment of the present invention includes a display module 120 and a touch sensing layer 121. The display module 120 of the present embodiment may adopt the overall structural design of the display module 120 as shown in fig. 1, and for simplicity, only the conductive shielding layer 122 and the display unit 123 are used for representing the description, where the conductive shielding layer 122 is the conductive shielding layer 904 in the touch display panel 90 of fig. 1, and the display unit 123 includes other layers except the conductive shielding layer 904 in the touch display panel 90 of fig. 1. The touch sensing layer 121 is used for providing position sensing of a touch position for the touch display system 10 with pressure sensing.
In the present embodiment, the touch sensing layer 121 is disposed on the display module 120 and is insulated from the conductive shielding layer 122. Specifically, the touch sensing layer 121 may be attached to the display module 120 by an optical adhesive (not shown), for example, so as to be insulated from the conductive shielding layer 122 of the display module 120 by at least the optical adhesive.
As shown in fig. 2, the touch display system with pressure sensing 10 further includes a control unit 11, where the control unit 11 is electrically connected to the touch sensing layer 121 and the conductive shielding layer 122, and controls the operation states of the touch sensing layer 121 and the conductive shielding layer 122 in a time-sharing manner. The conductive shielding layer 122 is used for providing pressure sensing at the first timing and providing grounding for the display module 120 at the second timing.
Further, the conductive shielding layer 122 of the present embodiment has no electrode pattern, that is, the conductive shielding layer 122 is a conductive layer with a complete planar structure. The touch sensing layer 121 includes a first axial electrode 1211 and a second axial electrode 1212, wherein the first axial electrode 1211 and the second axial electrode 1212 intersect and are disposed in an insulating manner, as shown in fig. 2, the first axial electrode 1211 and the second axial electrode 1212 are in a diamond pattern with n rows by m columns distributed in an array. Of course, those skilled in the art will appreciate that the specific implementation of the touch sensing layer 121 in the present embodiment is not limited by the invention, and any electrode pattern and electrode stack structure design for sensing the touch position are all within the scope of the invention.
The first axial electrode 1211 is electrically connected to the control unit 11 through the connecting lines TX1-TXn, and the second axial electrode 1212 is electrically connected to the control unit 11 through the connecting lines RX 1-RXm. The conductive shielding layer 122 is electrically connected to the control unit 11 through a connection line RX. The connecting lines are arranged to facilitate mutual transmission of electrode signals between the control unit 11 and the touch sensing layer 121 and between the control unit and the conductive shielding layer 122.
In this embodiment, in order to use the conductive shielding layer 122 in the display module 120 as the pressure sensing layer, the control unit 11 performs time-sharing scanning by controlling the operation state of the conductive shielding layer 122, that is, the control unit 11 switches the conductive shielding layer 122 to operate in a pressure sensing or grounding state, and divides the signal scanning into a first timing sequence and a second timing sequence, so that the conductive shielding layer 122 is used for providing pressure sensing in the first timing sequence, and the conductive shielding layer 122 is used for providing grounding for the display module 120 in the second timing sequence.
In the present embodiment, the pressure sensing method of the conductive shielding layer 122 may specifically adopt a self-capacitance type or a mutual capacitance type to sense the capacitance variation generated by the finger pressing. More specifically, the greater the force of the finger pressing, the larger the contact area between the finger and the cover 901, and when the finger has a larger contact area, the larger the capacitance value increased (in self-capacitance sensing) or decreased (in mutual capacitance sensing) in the sensing is, so that the present embodiment can utilize the capacitance sensing method to perform the pressure sensing.
When the pressure sensing method of the conductive shielding layer 122 is a self-capacitance sensing design, at the first timing, the control unit 11 controls the first axial electrode 1211 and the second axial electrode 1212 to be in a Floating state (Floating), and senses a pressure sensing signal generated by a background capacitance between the conductive shielding layer 122 and a ground (not shown); at the second timing, the control unit 11 provides a driving signal to the first axial electrode 1211, senses a touch sensing signal generated by a capacitance between the second axial electrode 1212 and the first axial electrode 1211, and controls the conductive shielding layer 122 to be in the grounded state.
When the pressure sensing method of the conductive shielding layer 122 is a mutual capacitance sensing design, at the first timing, the control unit 11 provides a driving signal to the first axial electrode 1211, senses a touch sensing signal generated by a capacitance between the second axial electrode 1212 and the first axial electrode 1211, and senses a pressure sensing signal generated by a capacitance between the conductive shielding layer 122 and the first axial electrode 1211; at the second timing, the control unit 11 provides the driving signal to the first axial electrode 1211, senses the touch sensing signal generated by the capacitance between the second axial electrode 1212 and the first axial electrode 1211, and controls the conductive shielding layer 122 to be in the grounded state.
As shown in fig. 2, the control unit 11 further includes a signal control module 111, a driving circuit module 112, a touch sensing circuit module 113, a pressure sensing circuit module 114, and a plurality of circuit switches S. Referring to fig. 2 and fig. 3, the driving circuit module 112 is connected to the touch sensing layer 121, specifically to the first axial electrode 1211 of the touch sensing layer 121, through the circuit switch S and the connection line TX 1-TXn; the touch sensing circuit module 113 is connected to the touch sensing layer 121, specifically to the first axial electrode 1212 of the touch sensing layer 121, through the circuit switch S and the connection lines RX 1-RXm; the pressure sensing circuit module 114 may be connected to the conductive shield 122 through the circuit switch S and the connection line (RX or TX).
The signal control module 111 is electrically connected to the circuit switches S and can send out a switch signal to control the connection status of each circuit switch S. The control unit 11 of the present embodiment can be adapted to the self-capacitance and mutual-capacitance pressure sensing manners adopted for the conductive shielding layer 122 through the design of the circuit switch S.
With the architecture of the control unit 11 shown in fig. 3, the following description will be made by using a self-contained pressure sensing method and a mutual-contained pressure sensing method in combination with a time-sharing scanning sensing design of the control unit 11.
Examples of self-contained pressure sensing approaches:
at a first timing (t1 time), the signal control module 111 controls the circuit switch S connected to the first axial electrode 1211 and the second axial electrode 1212 to float, i.e. the first axial electrode 1211 and the second axial electrode 1212 are not conducted to the driving circuit module 112 and the touch sensing circuit module 113, respectively; in addition, the circuit switch S connected to the conductive shielding layer 122 is controlled to be conducted to the pressure sensing circuit module 114. In contrast, in the present embodiment, at the first timing, the driving circuit module 112 and the touch sensing circuit module 113 do not perform touch position sensing; the pressure sensing circuit module 114 scans the conductive shielding layer 122 by self-contained sensing for pressure sensing.
At the second timing (t2 time), the signal control module 111 controls the circuit switch S connected to the first axial electrode 1211 to be conducted to the driving circuit module 112, and controls the circuit switch S connected to the second axial electrode 1212 to be conducted to the touch sensing circuit module 113; in addition, the circuit switch S connected to the conductive shield layer 122 is controlled to be grounded. In contrast, in the embodiment, at the second timing, the driving circuit module 112 and the touch sensing circuit module 113 perform mutual capacitance sensing on the touch sensing layer 121 (the first axial electrode 1211 and the second axial electrode 1212) to perform touch position sensing; at this time, the conductive shielding layer 122 is in a grounding state for providing a desired grounding effect for the display module 123.
It should be noted that, in an embodiment, the ground terminal of the circuit switch S connected to the conductive shielding layer 122 may be electrically connected to a metal frame or a metal casing (not shown) of the touch display system 10, or the conductive shielding layer 122 may be electrically connected to the ground terminal of a circuit board (not shown) on which the control unit 11 is disposed, which is not limited in the invention.
The embodiment of the mutual capacitance type pressure sensing mode comprises the following steps:
at the first timing (t1 time), the signal control module 111 controls the circuit switch S connected to the first axial electrode 1211 to be conducted to the driving circuit module 112, controls the circuit switch S connected to the second axial electrode 1212 to be conducted to the touch sensing circuit module 113, and controls the circuit switch S connected to the conductive shielding layer 122 to be conducted to the pressure sensing circuit module 114. In contrast, in the present embodiment, at the first timing, the driving circuit module 112 and the touch sensing circuit module 113 perform mutual capacitance sensing on the touch sensing layer 121 (the first axial electrode 1211 and the second axial electrode 1212) to perform touch position sensing; at this time, the pressure sensing circuit module 114 scans the conductive shielding layer 122 by mutual capacitance sensing for pressure sensing.
At the second timing (t2 time), the signal control module 111 controls the circuit switch S connected to the first axial electrode 1211 to be conducted to the driving circuit module 112, controls the circuit switch S connected to the second axial electrode 1212 to be conducted to the touch sensing circuit module 113, and controls the circuit switch S connected to the conductive shielding layer 122 to be grounded. In contrast, in the embodiment, at the second timing, the driving circuit module 112 and the touch sensing circuit module 113 perform mutual capacitance sensing on the touch sensing layer 121 (the first axial electrode 1211 and the second axial electrode 1212) to perform touch position sensing; at this time, the conductive shielding layer 122 is in a grounding state for providing a desired grounding effect for the display module 123.
Further, the principle of the pressure sensing of the finger pressing of the touch display system 10 with pressure sensing is shown in fig. 4, wherein the finger 101, the touch sensing layer 121, the conductive shielding layer 122 and the ground GND respectively represent a conductor, and two conductors separated by a space or a dielectric layer can form a capacitor.
If the conductive shielding layer 122 is a self-capacitance sensing method, when the finger 101 touches or presses the touch display system 10 with pressure sensing, since the capacitance between the finger 101 and the conductive shielding layer 122 generated by the intervention of the finger 101 is connected in series with the original background capacitance between the conductive shielding layer 122 and the ground GND, the pressure sensing circuit module 114 senses the background capacitance between the conductive shielding layer 122 and the ground GND plus the capacitance between the finger 101 and the conductive shielding layer 122, and the capacitance variation between the summed capacitance and the original background capacitance is the pressure sensing signal sensed by the pressure sensing circuit module 114. The larger the pressing force of the finger 101 is, the larger the contact area between the finger 101 and the surface of the touch display system 10 with pressure sensing is, and correspondingly, the larger the capacitance value of the capacitance between the finger 101 and the conductive shielding layer 122 is. Accordingly, the pressure sensing circuit module 114 can determine the pressing force of the finger 101 according to the sensed capacitance variation.
If the mutual capacitance scanning method is adopted, when the finger 101 touches or presses the touch display panel 10 with pressure sensing, since the capacitance between the finger 101 and the touch sensing layer 121 generated by the finger 101 being inserted is parallel to the capacitance between the touch sensing layer 121 and the conductive shielding layer 122, the pressure sensing circuit 114 will sense that the capacitance between the touch sensing layer 121 and the conductive shielding layer 122 is subtracted from the capacitance between the finger 101 and the touch sensing layer 121, and the capacitance variation between the subtracted capacitance and the capacitance between the touch sensing layer 121 and the conductive shielding layer 122 is the pressure sensing signal sensed by the pressure sensing circuit 114. Similarly, the pressure sensing circuit module 114 can also determine the pressing force of the finger 101 according to the magnitude of the sensed capacitance variation.
Referring to fig. 5, in the present modified embodiment, the control unit 11 also includes a signal control module 111, a driving circuit module 112, a touch sensing circuit module 113, a pressure sensing circuit module 114 and a circuit switch S, and the difference from the embodiment shown in fig. 4 is that the driving circuit module 112 of the present embodiment is directly electrically connected to the touch sensing layer 121 (the first axial electrode 1211) through the connection lines TX1-TXn, and similarly, the touch sensing circuit module 113 is directly electrically connected to the touch sensing layer 121 (the second axial electrode 1212) through the connection lines RX 1-RXm. In addition, the pressure sensing circuit module 114 is still connected to the conductive shielding layer 122 through the circuit switch S and the connection line RX or TX. In contrast, the signal control module 111 is electrically connected to the circuit switch S, and the signal control module 111 can also send out a switch signal to control the connection state of the circuit switch S.
Compared with the embodiment shown in fig. 3, the structure of the control unit 11 of the present embodiment can effectively omit the volume occupied by the circuit switch S connected to the touch sensing layer 121, but the control unit 11 of the present embodiment is only suitable for using a mutual capacitance type pressure sensing method for the conductive shielding layer 122.
Under the architecture of the control unit 11 shown in fig. 5, the time-sharing scanning sensing design of the control unit 11 is combined with a mutual-capacitance pressure sensing method to be described as follows:
at the first timing (t1 time), the signal control module 111 controls the circuit switch S connected to the conductive shielding layer 122 to be conducted to the pressure sensing circuit module 114. In contrast, in the present embodiment, at the first timing, the driving circuit module 112 and the touch sensing circuit module 113 perform mutual capacitance sensing on the touch sensing layer 121 (the first axial electrode 1211 and the second axial electrode 1212) to perform touch position sensing; at this time, the pressure sensing circuit module 114 scans the conductive shielding layer 122 by mutual capacitance sensing for pressure sensing.
At the second timing (time t 2), the signal control module 111 controls the circuit switch S connected to the conductive shielding layer 122 to be grounded. In contrast, in the embodiment, at the second timing, the driving circuit module 112 and the touch sensing circuit module 113 perform mutual capacitance sensing on the touch sensing layer 121 (the first axial electrode 1211 and the second axial electrode 1212) to perform touch position sensing; at this time, the conductive shielding layer 122 is in a grounding state for providing a desired grounding effect for the display module 123.
In some embodiments of the present invention, the control unit 11 may adopt an existing touch circuit chip, or may be a newly-arranged sensing circuit chip. In the present invention, the touch display system 10 with pressure sensing can have the function of three-dimensional touch sensing by only changing the signal scanning and processing manner and using the conductive shielding layer 904 already existing in the touch display panel 90 (including the IPS panel) shown in fig. 1.
In the present invention, in the process of sensing the conductive shielding layer 122 by using the self-capacitance scanning or mutual-capacitance scanning, the matching requirement for the touch electrode of the touch sensing layer 121 may preferably be:
if the self-capacitance scanning method is adopted, the gap between the first axial electrode 1211 and the second axial electrode 1212 may be small, and the size of the gap does not affect the capacitance variation of the finally obtained pressing force during the self-capacitance scanning process of the conductive shielding layer 122.
If the mutual capacitance scanning method is adopted, the gap between the first axial electrode 1211 and the second axial electrode 1212 needs to be larger, so as to reduce the capacitance between the first axial electrode 1211 and the second axial electrode 1212, and avoid affecting the mutual capacitance sensing effect of the conductive shielding layer 122.
Referring to fig. 6, a touch display system 20 with pressure sensing is also provided in the second embodiment of the present invention, which at least includes a touch sensing layer 221, a conductive shielding layer 222 and a display unit 223 arranged from top to bottom.
The touch display system 10 with pressure sensing described in fig. 3 is different in that: the conductive shielding layer 222 has an electrode pattern, i.e. the conductive shielding layer 222 is a conductive layer with a patterned structure. As shown in fig. 6 in particular, the conductive-shielding layer 222 may be patterned into a plurality of bar-patterned electrodes.
It should be further noted that, since the conductive shielding layer 222 is mainly used for providing the pressure sensing and grounding functions, rather than precisely sensing the touch position, in the preferred embodiment, the plurality of electrodes in the conductive shielding layer 222 do not need to be electrically connected to the control unit 21 through a respective connection line, but only all the electrodes need to be connected in parallel or in series, and finally, the electrodes are electrically connected to the control unit 21 through a connection line, so as to save the routing area of the connection line.
In some other embodiments of the present invention, as shown in fig. 7, the conductive shielding layer 222' may be patterned into a plurality of curved electrodes, and the plurality of electrodes are connected in series.
In some preferred embodiments of the present invention, the conductive shielding layer 222' may be further patterned into one or more of radial, spiral, or zigzag electrodes.
In the present embodiment, the number of electrodes of the conductive shielding layer 222 (222') and the shape thereof are listed only as an example, and are not a limitation of the present invention. In practical applications, whether the conductive shielding layer 222 (222') has a specific pattern design does not affect the accuracy and sensitivity of three-dimensional touch sensing.
Compared with the prior art, the touch display system with pressure sensing provided by the invention has the following advantages:
the touch display system with pressure sensing comprises a touch sensing layer and a display module, wherein the conductive shielding layer contained in the display module is scanned in a time-sharing manner, so that the conductive shielding layer is used for providing pressure sensing in a first time sequence, and the conductive shielding layer is used for providing grounding for the display module in a second time sequence. Specifically, the existing conductive shielding layer in the display module is used as a pressure sensing layer, and the switching design of the operating state of the conductive shielding layer is matched to perform time-sharing scanning, so that the pressure sensing function is realized without affecting the function of the display module. Therefore, compared with the prior art, the touch control display system can realize the pressure sensing function in the touch control display system without arranging a plurality of pressure sensing layers, simplify the pressure sensing structure and reduce the cost.
In the invention, the control unit is adopted to control the operation states of the touch sensing layer and the conductive shielding layer in a time-sharing manner, the control unit can further sense a touch sensing signal generated by a capacitance between the first axial electrode and the second axial electrode, and can also sense the pressure of the conductive shielding layer by adopting self-capacitance sensing or mutual capacitance sensing. The control unit is used for time-sharing control, so that the interference of signals between the touch or pressing position sensing and the pressure sensing can be avoided, the signal-to-noise ratio of the pressure sensing signal is reduced, and more accurate touch and pressing position sensing and pressure sensing are realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (15)
1. A touch display system with pressure sensing is characterized in that: the touch display system comprises a touch sensing layer and a display module, wherein the display module further comprises a conductive shielding layer, the touch sensing layer is arranged on the display module and is arranged in an insulated manner with the conductive shielding layer, the touch sensing layer comprises a first axial electrode, the touch display system comprises a grounding end, a pressure sensing signal is generated by a capacitor between the conductive shielding layer and the first axial electrode or a background capacitor between the conductive shielding layer and the grounding end in a first time sequence and is used for providing capacitive pressure sensing, and the conductive shielding layer is in a grounding state in a second time sequence.
2. The touch display system with pressure sensing of claim 1, wherein: the touch sensing layer further comprises a second axial electrode which is intersected with the first axial electrode and arranged in an insulating mode.
3. The touch display system with pressure sensing of claim 2, wherein: the touch control device comprises a control unit, wherein the control unit is electrically connected with the touch control sensing layer and the conductive shielding layer and controls the operation states of the touch control sensing layer and the conductive shielding layer in a time-sharing manner.
4. The touch display system with pressure sensing of claim 3, wherein: in a first timing sequence, when the pressure sensing signal is generated by capacitance between the conductive shielding layer and the first axial electrode, the control unit controls the first axial electrode and the second axial electrode to be in a floating state and senses the pressure sensing signal; at a second time sequence, the control unit provides a driving signal to the first axial electrode, senses a touch sensing signal generated by a capacitance between the second axial electrode and the first axial electrode, and controls the conductive shielding layer to be in a grounding state.
5. The touch display system with pressure sensing of claim 4, wherein: the control unit comprises a driving circuit module, a touch sensing circuit module, a pressure sensing circuit module and a plurality of circuit switches, wherein the driving circuit module is electrically connected with the first axial electrode through the circuit switches, the touch sensing circuit module is electrically connected with the second axial electrode through the circuit switches, and the pressure sensing circuit module is electrically connected with the conductive shielding layer through the circuit switches.
6. The touch display system with pressure sensing of claim 5, wherein: the control unit further comprises a signal control module electrically connected to the circuit switches and used for controlling the connection state of each circuit switch.
7. The touch display system with pressure sensing of claim 6, wherein: at a first time sequence, the signal control module controls the circuit switch connected with the first axial electrode and the second axial electrode to be in floating connection, and controls the circuit switch connected with the conductive shielding layer to be conducted to the pressure sensing circuit module; and at a second time sequence, the signal control module controls the circuit switch connected with the first axial electrode to be conducted on the driving circuit module, controls the circuit switch connected with the second axial electrode to be conducted on the touch sensing circuit module, and controls the circuit switch connected with the conductive shielding layer to be grounded.
8. The touch display system with pressure sensing of claim 3, wherein: in a first timing sequence, when the background capacitance between the conductive shielding layer and the ground terminal generates the pressure sensing signal, the control unit provides a driving signal to the first axial electrode, senses a touch sensing signal generated by the capacitance between the second axial electrode and the first axial electrode, and senses the pressure sensing signal; at a second timing, the control unit provides the driving signal to the first axial electrode, senses the touch sensing signal generated by the capacitance between the second axial electrode and the first axial electrode, and controls the conductive shielding layer to be in a grounded state.
9. The touch display system with pressure sensing of claim 8, wherein: the control unit comprises a driving circuit module, a touch sensing circuit module, a pressure sensing circuit module and a plurality of circuit switches, wherein the driving circuit module is electrically connected with the first axial electrode through the circuit switches, the touch sensing circuit module is electrically connected with the second axial electrode through the circuit switches, and the pressure sensing circuit module is electrically connected with the conductive shielding layer through the circuit switches.
10. The touch display system with pressure sensing of claim 9, wherein: the control unit further comprises a signal control module electrically connected to the circuit switches and used for controlling the connection state of each circuit switch.
11. The touch display system with pressure sensing of claim 10, wherein: at a first time sequence, the signal control module controls the circuit switch connected with the first axial electrode to be conducted to the driving circuit module, controls the circuit switch connected with the second axial electrode to be conducted to the touch sensing circuit module, and controls the circuit switch connected with the conductive shielding layer to be conducted to the pressure sensing circuit module; and at a second time sequence, the signal control module controls the circuit switch connected with the first axial electrode to be conducted on the driving circuit module, controls the circuit switch connected with the second axial electrode to be conducted on the touch sensing circuit module, and controls the circuit switch connected with the conductive shielding layer to be grounded.
12. The touch display system with pressure sensing of claim 8, wherein: the control unit comprises a driving circuit module, a touch sensing circuit module, a pressure sensing circuit module and a plurality of circuit switches, wherein the driving circuit module is electrically connected with the first axial electrode, the touch sensing circuit module is electrically connected with the second axial electrode, and the pressure sensing circuit module is electrically connected with the conductive shielding layer through the circuit switches.
13. The touch display system with pressure sensing of claim 12, wherein: the control unit further comprises a signal control module electrically connected to the circuit switches and used for controlling the connection state of each circuit switch.
14. The touch display system with pressure sensing of claim 13, wherein: at a first time sequence, the signal control module controls the circuit switch connected with the conductive shielding layer to be conducted to the pressure sensing circuit module; and at a second time sequence, the signal control module controls the circuit switch connected with the conductive shielding layer to be grounded.
15. The touch display system with pressure sensing of any of claims 1-14, wherein: the conductive shielding layer is a conductive layer with a patterned structure or a conductive layer with a complete plane structure.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610799581.9A CN106383607B (en) | 2016-08-31 | 2016-08-31 | Touch display system with pressure sensing |
| TW106128471A TWI630537B (en) | 2016-08-31 | 2017-08-22 | Touch display sysyem with pressure detection |
| TW106212426U TWM557388U (en) | 2016-08-31 | 2017-08-22 | Touch display sysyem with pressure detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610799581.9A CN106383607B (en) | 2016-08-31 | 2016-08-31 | Touch display system with pressure sensing |
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| CN106383607A CN106383607A (en) | 2017-02-08 |
| CN106383607B true CN106383607B (en) | 2020-02-21 |
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| CN106383607B (en) * | 2016-08-31 | 2020-02-21 | 宸盛光电有限公司 | Touch display system with pressure sensing |
| CN106814928A (en) * | 2017-02-22 | 2017-06-09 | 合肥鑫晟光电科技有限公司 | OGS touch screen and preparation method thereof, touch control display apparatus |
| CN108089752A (en) * | 2017-12-28 | 2018-05-29 | 信利半导体有限公司 | A kind of IPS types touch-control display module and display device |
| CN110134281B (en) * | 2019-05-16 | 2022-09-16 | 上海艾为电子技术股份有限公司 | Capacitance detection system and method |
| CN112578461B (en) * | 2019-09-30 | 2022-11-18 | 华为技术有限公司 | Key detection device and electronic equipment |
| TWI712933B (en) * | 2020-04-28 | 2020-12-11 | 義隆電子股份有限公司 | Touch and display device with fingerprint sensing function and touch sensing device |
| CN112885287B (en) * | 2021-03-01 | 2023-01-17 | 深圳天德钰科技股份有限公司 | Display panel |
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Also Published As
| Publication number | Publication date |
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| TWM557388U (en) | 2018-03-21 |
| CN106383607A (en) | 2017-02-08 |
| TW201812557A (en) | 2018-04-01 |
| TWI630537B (en) | 2018-07-21 |
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