CN103927070A - Embedded electromagnetic touch display screen and touch display device - Google Patents
Embedded electromagnetic touch display screen and touch display device Download PDFInfo
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- CN103927070A CN103927070A CN201310374553.9A CN201310374553A CN103927070A CN 103927070 A CN103927070 A CN 103927070A CN 201310374553 A CN201310374553 A CN 201310374553A CN 103927070 A CN103927070 A CN 103927070A
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Abstract
The invention discloses an embedded electromagnetic touch display screen and a touch display device, which mainly comprise: the common electrode layer on the existing display panel is split into transparent and strip-shaped common electrodes, and a plurality of strip-shaped common electrodes are electrically connected and a plurality of data lines which are distributed in a crossed manner with the common electrodes are electrically connected, so that all the strip-shaped common electrodes reach a uniform potential within the display time, the function of the common electrode layer is realized, and the aperture opening ratio of the display screen is ensured; in the touch control time, at least two public electrodes form independent first direction coils to induce electromagnetic signals, at least two data lines form independent second direction coils to induce electromagnetic signals, and induction coordinates are determined according to the induction current, so that the electromagnetic touch effect is achieved under the condition that other equipment is not additionally arranged on the display screen equipment.
Description
Technical Field
The invention relates to the technical field of display, in particular to an embedded electromagnetic touch display screen and a touch display device.
Background
With the rapid development of display technology, Touch screens (Touch panels) have gradually spread throughout the lives of people. Compared with the traditional display which only can provide a display function, the display using the touch screen can enable a user to perform information interaction with the display control host, therefore, the touch screen can completely or at least partially replace a common input device, so that the existing display can not only display but also perform touch control.
Common touch screens include resistive touch screens, capacitive touch screens, electromagnetic touch screens, infrared blocking touch screens, and the like. The existing electromagnetic touch screen is generally integrated with an LCD panel and an electromagnetic input function in a display device, adopts a modular splicing mode, and is formed by splicing an LCD module and an electromagnetic screen module, for example: as shown in fig. 1, which is a schematic structural diagram of an integrated module for embedded electromagnetic display in the prior art, a liquid crystal display panel includes a display unit and an electromagnetic induction unit 10, wherein the display unit includes a thin film transistor 09 connected to a gate electrode by a gate line and controlled to be turned on, and an electrode element connected to a source line and a drain electrode of the thin film transistor. The electromagnetic induction unit comprises a thin film transistor and an induction coil.
Therefore, in the conventional electromagnetic touch screen, the thin film transistor and the induction coil need to be added in the display area, so that the aperture ratio of the LCD panel is not high.
Disclosure of Invention
The invention provides an embedded electromagnetic touch display screen and a touch display device, which are used for solving the problem that in the prior art, a thin film transistor and an induction coil are required to be added in a display area of an electromagnetic touch screen, so that the aperture opening ratio of an LCD panel is not high.
An in-cell electromagnetic touch display screen, includes relative first base plate and the second base plate that sets up, in-cell electromagnetic touch display screen still includes:
the data lines are arranged on the first substrate and on one side facing the second substrate, wherein at least two data lines are electrically connected through a first switch unit to form a first direction coil;
the plurality of transparent strip-shaped common electrodes are distributed in an insulated and crossed manner with the data wire, wherein at least two strip-shaped common electrodes are electrically connected to form a second direction coil;
when an image is displayed, the same common voltage is applied to all the strip-shaped common electrodes, and the first switch unit is switched off to enable all the data lines to transmit display signals respectively;
when touch detection is performed, the first switch unit is switched on, so that a plurality of first direction coils formed by the data lines induce electromagnetic signals, induced currents are output to determine a second direction coordinate of a touch position, and all the strip-shaped common electrodes form a plurality of independent second direction coils to induce electromagnetic signals, and induced currents are output to determine the first direction coordinate of the touch position.
The strip-shaped common electrode is arranged on one side of the first substrate, which faces the second substrate; or,
the strip-shaped common electrode is disposed on a side of the second substrate facing the first substrate.
The position of the strip-shaped common electrode is further limited.
At least two strip common electrodes are electrically connected to form a second direction coil, and the coil comprises:
two adjacent strip-shaped common electrodes are in a group, and one end of each group of the two strip-shaped common electrodes is electrically connected through a lead to form a second direction coil.
At least two strip common electrodes are electrically connected to form a second direction coil, and the coil comprises:
the three adjacent strip-shaped common electrodes are in one group, wherein the three adjacent strip-shaped common electrodes in each group are sequentially a first strip-shaped common electrode, a second strip-shaped common electrode and a third strip-shaped common electrode;
the first strip-shaped common electrode is electrically connected with the third strip-shaped common electrode at a first end through a conducting wire, the second strip-shaped common electrode is electrically connected with the third strip-shaped common electrode at a second end through a conducting wire to form a second direction coil, and the first end and the second end are respectively located at two different ends of the three strip-shaped common electrodes.
At least two strip common electrodes are electrically connected to form a second direction coil, and the coil comprises:
the three adjacent strip-shaped common electrodes are in one group, wherein the three adjacent strip-shaped common electrodes in each group are sequentially a first strip-shaped common electrode, a second strip-shaped common electrode and a third strip-shaped common electrode;
the first strip-shaped common electrode is electrically connected with the second strip-shaped common electrode at a first end through a lead, and the second strip-shaped common electrode is electrically connected with the third strip-shaped common electrode at the first end through a lead so as to form a second direction coil.
At least two strip common electrodes are electrically connected to form a second direction coil, and the coil comprises:
and at least two strip-shaped common electrodes with set values at intervals are electrically connected at one end of each of the two strip-shaped common electrodes through a lead to form a second-direction coil.
A mode that a plurality of strip-shaped common electrodes are electrically connected to form the second-direction coil is provided, and the flexibility of the process is embodied.
The embedded electromagnetic touch screen further comprises: and the pixel unit array comprises a plurality of rows or columns of pixel units in the area occupied by each strip-shaped common electrode.
The first switching unit includes a plurality of first TFTs and a first control line;
the in-cell electromagnetic touch display screen further comprises a second switch unit, wherein the second switch unit comprises a plurality of second TFTs, a second control line and a first detection unit, and the second switch unit comprises:
a gate electrode of each first TFT is electrically connected to the first control line, a source electrode or a drain electrode is electrically connected to one end of one of the at least two data lines, and a drain electrode or a source electrode is electrically connected to one end of the other of the at least two data lines;
the grid electrode of each second TFT is electrically connected with the second control line, the source electrode or the drain electrode is electrically connected with one end of the corresponding first direction coil, and the drain electrode or the source electrode is electrically connected with the first detection unit;
when the image is displayed, the first switch unit is switched off to enable each data line to transmit the display signal respectively, and the method comprises the following steps:
the first control line is applied with a set first voltage to disconnect all the first TFTs, the second control line is applied with a set second voltage to disconnect all the second TFTs, so that each data line is independently distributed to respectively transmit display signals;
when the touch detection is performed, the first switch unit is turned on to enable a plurality of first direction coils formed by the plurality of data lines to induce electromagnetic signals, and the induced current is output to determine a second direction coordinate of the touch position, including:
the first control line is applied with a set third voltage, and all the first TFTs are conducted, so that at least two data lines electrically connected through the first TFTs form independent first direction coils;
the second control line is applied with a set fourth voltage, the first directional coil subjected to electromagnetic induction generates induction current, and the induction current is detected by the first detection unit to determine a second directional coordinate of the output touch position.
The in-cell electromagnetic touch display screen further comprises a third switching unit, wherein the third switching unit comprises a plurality of third TFTs, third control lines and common electrode lines, and the third switching unit comprises:
a gate of each third TFT is electrically connected to the third control line, a source or a drain is electrically connected to one end of a corresponding one of the second directional coils, and the drain or the source is electrically connected to the common electrode line;
when the image is displayed, a common voltage is applied to all the strip-shaped common electrodes, and the method comprises the following steps:
when the image is displayed, the third control line is applied with a set fifth voltage, all the third TFTs are started, and the common voltage applied to the common electrode line is transmitted to all the strip-shaped common electrodes through the started third TFTs.
The in-cell electromagnetic touch display screen further comprises: a second detection unit electrically connected to a source or drain of each of the third TFTs;
during touch detection, all the strip-shaped common electrodes form a plurality of independent second direction coil induction electromagnetic signals and output induction current to determine a first direction coordinate of a touch position, and the method specifically comprises the following steps:
when the touch detection is carried out, a set sixth voltage is applied to the third control line, all the third TFTs are disconnected, and the second directional coils are independent of one another;
the second direction coil subjected to the electromagnetic induction generates an induced current, and the induced current is detected by the second detection unit to determine a first direction coordinate of the touch position.
The embedded electromagnetic touch display screen is one of an LCD, an OLED and electronic paper.
A touch display device comprises the embedded electromagnetic touch display screen.
The invention has the following beneficial effects:
in the embodiment of the invention, a plurality of data wires which are insulated and crossly distributed with the strip-shaped common electrode are arranged, and at least two data wires are electrically connected through the first switch unit to form a first directional ring, and transparent strip-shaped common electrodes are arranged, and at least two strip-shaped common electrodes are connected to form a second direction coil, when the image is displayed, the same common voltage is applied to all the strip-shaped common electrodes, the first switch unit is switched off, so that the data lines respectively transmit display signals, when in touch detection, all the strip-shaped common electrodes form a plurality of independent second direction coils to induce electromagnetic signals, and the first switch unit is turned on to enable a plurality of first direction coils formed by the plurality of data lines to induce electromagnetic signals, and the induced current is output to determine a second direction coordinate of the touch position. Therefore, a common electrode layer on the existing display panel is split into transparent and strip-shaped common electrodes, and a plurality of strip-shaped common electrodes are electrically connected and a plurality of data lines which are distributed in a crossed manner with the common electrodes are electrically connected, so that all the strip-shaped common electrodes reach a uniform potential within the display time, the function of the common electrode layer is realized, and the aperture ratio of the display screen is ensured; in the touch control time, at least two public electrodes form independent first direction coils to induce electromagnetic signals, at least two data lines form independent second direction coils to induce electromagnetic signals, and induction coordinates are determined according to the induction current, so that the electromagnetic touch effect is achieved under the condition that no other structures are additionally added to the display screen equipment, and the aperture opening ratio is not reduced.
Drawings
FIG. 1 is a schematic diagram of an integrated module for embedded electromagnetic display according to the prior art;
FIG. 2 is a schematic perspective view of an in-cell electromagnetic touch display panel according to the present invention;
FIG. 3(a) is a cross-sectional view of an in-cell electromagnetic touch screen provided in the present invention;
FIG. 3(b) is another cross-sectional view of an in-cell electromagnetic touch screen provided in the present invention;
FIG. 4 is a schematic view of a first structure of an in-cell electromagnetic touch display panel according to the present invention;
FIG. 5 is a schematic view of a second structure of an in-cell electromagnetic touch display panel according to the present invention;
FIG. 6 is a schematic view of a third structure of an in-cell electromagnetic touch display panel according to the present invention;
FIG. 7 is a diagram illustrating a fourth structure of an in-cell electromagnetic touch display panel according to the present invention;
FIG. 8 is a schematic structural diagram of the connection between the first switch unit and the data line;
fig. 9 is a schematic structural view of the connection of the third switching unit and the strip-shaped common electrode.
Detailed Description
In order to achieve the object of the present invention, an embodiment of the present invention provides an embedded electromagnetic touch display screen and a touch display device, in which a plurality of data lines are arranged to be insulated from and cross-distributed with strip-shaped common electrodes, at least two data lines are electrically connected through a first switch unit to form a first direction coil, a transparent strip-shaped common electrode is arranged, and at least two common electrodes are connected to form a second direction coil, and when displaying an image, the same common voltage is applied to all the strip-shaped common electrodes, the first switch unit is turned off to enable each data line to transmit a display signal, when detecting a touch, all the strip-shaped common electrodes form independent second direction coil induced electromagnetic signals and output induced currents to determine first direction coordinates of a touch position, and the first switch unit is turned on to enable first direction coils formed by the plurality of data lines to induce electromagnetic signals, and outputs the induced current to determine a second directional coordinate of the touch position.
Therefore, a common electrode layer on the existing display panel is split into transparent and strip-shaped common electrodes, and a plurality of strip-shaped common electrodes are electrically connected and a plurality of data lines which are distributed in a crossed manner with the common electrodes are electrically connected, so that all the strip-shaped common electrodes reach a uniform potential within the display time, the function of the common electrode layer is realized, and the aperture ratio of the display screen is ensured; in the touch control time, at least two public electrodes form independent first direction coils to induce electromagnetic signals, at least two data lines form independent second direction coils to induce electromagnetic signals, and induction coordinates are determined according to the induction current, so that the electromagnetic touch effect is achieved under the condition that no other structures are additionally added to the display screen equipment, and the aperture opening ratio is not reduced.
The following detailed description of various embodiments of the invention refers to the accompanying drawings.
The embedded electromagnetic touch display screen provided by the embodiment of the invention comprises: the first substrate 11 and the second substrate 12 are oppositely arranged, and in addition, the in-cell electromagnetic touch display screen further comprises:
a plurality of data lines 13 disposed on a side of the first substrate 11 facing the second substrate 12, wherein at least two of the data lines are electrically connected by a first switching unit 21 to form a first direction (e.g., X direction) coil;
a plurality of transparent strip-shaped common electrodes 14 distributed in an insulated and crossed manner with the data lines 13, wherein at least two strip-shaped common electrodes 14 are electrically connected to form a second direction (for example, Y direction) coil.
When displaying an image, the same common voltage is applied to all the bar-shaped common electrodes 14, and the first switching unit 21 is turned off so that the display signals are transmitted to the respective data lines 13.
At the time of touch detection, the first switch unit 21 is turned on so that a plurality of first direction (X direction) coils formed by the data lines 13 induce electromagnetic signals and outputs induced currents to determine second direction (Y direction) coordinates of a touch position, and all the strip-shaped common electrodes 14 form independent second direction (Y direction) coils to induce electromagnetic signals and output induced currents to determine the first direction (X direction) coordinates of the touch position.
Wherein the shape of the first direction coil extends along the first direction, but a plurality of the first direction coils are arranged along the second direction (Y direction); the shape of the second direction coil extends along the second direction, but a plurality of second direction coils are arranged along the first direction (X direction).
Fig. 2 is a schematic perspective view of an embedded electromagnetic touch display screen according to an embodiment of the present invention.
As can be seen from the schematic perspective view shown in fig. 2, the strip-shaped common electrode 14 is disposed on the second substrate 12 and on the side facing the first substrate 11.
Namely, the stripe-shaped common electrodes and the data lines are disposed on different substrates. At this time, the in-cell electromagnetic touch display screen may be a TN type LCD.
In addition to this, the stripe-shaped common electrode 14 may be disposed on a side of the first substrate 11 facing the second substrate 12.
Namely, the strip-shaped common electrodes and the data lines are disposed on the same substrate. In this case, the in-cell touch display screen may be an IPS or FFS type LCD, or an OLED.
That is, the stripe-shaped common electrode 14 may be disposed on a side of the first substrate 11 facing the second substrate 12; or,
the strip-shaped common electrode 14 may also be disposed on one of the sides of the second substrate 12 facing the first substrate 11, and is not further limited herein.
In a preferred embodiment, each stripe of the common electrode 14 contains a plurality of rows or columns of pixel cells.
Typically, the in-cell electromagnetic touch screen further comprises: the plurality of pixel units 16 disposed on the first substrate 11 form a pixel unit array, and the data lines 13 belong to a part of the pixel units 16.
Briefly, the pixel unit array includes a plurality of scan lines 15 and a plurality of data lines 13 crossing each other in an insulating manner, and pixel units 16 disposed in a region surrounded by adjacent scan lines and adjacent data lines.
In the example shown in fig. 2, the pixel unit 16 is disposed in the AA display area.
It should be noted that the pixel unit is a common knowledge in the art, and various modifications thereof can be applied to the present invention. In addition, the in-cell electromagnetic touch display screen provided by the invention can also comprise known components in the existing display screen, such as a liquid crystal layer or an organic light emitting layer, and the like, and the description is not repeated.
In order to more clearly illustrate the internal structure of the in-cell electromagnetic touch screen of the present invention, a cross-sectional view of the in-cell electromagnetic touch screen provided by the present invention shown in fig. 3(a) is obtained by taking a data line in fig. 2 as a cross-sectional line (for example, a cross-sectional view BB /).
As shown in fig. 3(a), which is a cross-sectional view of an in-cell electromagnetic touch display panel provided by the present invention, in the in-cell electromagnetic touch display panel shown in fig. 3(a), the strip-shaped common electrodes and the data lines are disposed on the same substrate.
Specifically, the in-cell electromagnetic touch display screen sequentially comprises a first substrate 11, pixel units 16, strip-shaped common electrodes 14, a liquid crystal layer 17 and a second substrate 12 from bottom to top.
It should be noted that other structures, such as insulating layers, may also be provided between the layers, which are not shown in detail in the drawings; the data line 13 is a part of the pixel unit array, and a cross-sectional view of the data line 13 is not shown in the figure. In addition, the two rows of pixel units occupied by the common electrodes 14 are only illustrated as examples, but the present invention is not limited thereto.
As shown in fig. 3(b), another cross-sectional view of the in-cell electromagnetic touch display panel provided by the present invention is shown, in the in-cell electromagnetic touch display panel shown in fig. 3(b), the strip-shaped common electrodes and the data lines are disposed on different substrates.
Specifically, the in-cell electromagnetic touch display screen sequentially comprises a first substrate 11, a pixel unit 16, a liquid crystal layer 17, a strip-shaped common electrode 14 and a second substrate 12 from bottom to top.
It should be noted that other structures, such as insulating layers, may also be provided between the layers, which are not shown in detail in the drawings; the data line 13 is a part of the pixel unit array, and a cross-sectional view of the data line 13 is not shown in the figure. In addition, the two rows of pixel units occupied by the common electrodes 14 are only illustrated as examples, but the present invention is not limited thereto.
In another aspect, the stripe-shaped common electrode 14 is distributed across the data line 13 in an insulated manner, and includes:
the plurality of strip-shaped common electrodes 14 provided on the first substrate 11 and/or the second base station 12 extend along the pixel cell row direction (Y direction) and are arranged along the pixel cell column direction (X direction), and the plurality of data lines 13 provided on the first substrate 11 extend along the pixel cell column direction (X direction) and are arranged along the pixel cell row direction (Y direction).
Of course, the stripe-shaped common electrodes 14 are distributed across the data line insulation 13, and may further include a plurality of common electrodes 14 disposed on the first substrate 11 and/or the second base station 12 and arranged along the pixel unit row direction and extending along the column direction, and a plurality of data lines 13 disposed on the first substrate 11 and arranged along the pixel unit column direction and extending along the row direction.
The following describes the implementation of each part of the in-cell electromagnetic touch display screen.
The following describes an implementation manner of forming the second direction coil by connecting at least two strip-shaped common electrodes with reference to fig. 4 to 7 respectively in combination with the description drawings.
The method specifically comprises the following steps: fig. 4 is a schematic view of a first structure of an in-cell electromagnetic touch display panel according to the present invention.
Namely, the schematic view of the top view structure of the embedded touch display screen is formed by connecting the adjacent strip-shaped common electrodes to form the second direction coil.
As can be seen from fig. 4, two adjacent strip-shaped common electrodes are grouped, and one end of each group of two strip-shaped common electrodes 14 is electrically connected through a wire 18 to form a second direction coil.
Fig. 5 is a schematic view of a second structure of an in-cell electromagnetic touch display panel according to the present invention.
Namely, the schematic view of the top view structure of the embedded touch display screen is that three adjacent strip-shaped common electrodes are connected to form a second direction coil.
As can be seen from fig. 5, three adjacent strip-shaped common electrodes are in one group, wherein the three adjacent strip-shaped common electrodes of each group are a first strip-shaped common electrode 141, a second strip-shaped common electrode 142 and a third strip-shaped common electrode 143 in sequence.
The first bar-shaped common electrode 141 and the third bar-shaped common electrode 143 are electrically connected at a first end (at the left end in the figure) by a conducting wire 18, and the second bar-shaped common electrode 142 and the third bar-shaped common electrode 143 are electrically connected at a second end (at the right end in the figure) by a conducting wire 18 to form a second direction coil, wherein the first end and the second end are respectively located at two different ends (i.e., at the left end and the right end in the figure) of the three bar-shaped common electrodes.
It should be noted that the "first end" and the "second end" of the strip-shaped common electrode refer to two end points located on different sides of the substrate after the strip-shaped common electrode is disposed on the substrate, and the end point located on one side of the substrate is referred to as the "first end", and the end point located on the other side of the substrate opposite to the "first end" is referred to as the "second end".
Fig. 6 is a schematic view of a third structure of an in-cell electromagnetic touch display screen according to the present invention.
Namely, the schematic view of the top view structure of the embedded touch display screen is that three adjacent strip-shaped common electrodes are connected to form a second direction coil.
As can be seen from fig. 6, three adjacent strip-shaped common electrodes are in one group, wherein the three adjacent strip-shaped common electrodes of each group are a first strip-shaped common electrode 141, a second strip-shaped common electrode 142 and a third strip-shaped common electrode 143 in sequence.
The first bar-shaped common electrodes 141 and the second bar-shaped common electrodes 142 are electrically connected at a first end by a conductive wire, and the second bar-shaped common electrodes 142 and the third bar-shaped common electrodes 143 are electrically connected at the first end by a conductive wire, so as to form a second direction coil.
Fig. 7 is a schematic view of a fourth structure of the in-cell electromagnetic touch display panel according to the present invention.
Namely, the schematic view of the top view structure of the embedded touch display screen is that the two strip-shaped common electrodes are connected to form a second direction coil.
As can be seen from fig. 7, two strip-shaped common electrodes having a set value at intervals are electrically connected at one end thereof by a wire 18.
It should be noted that the interval setting value may be determined according to actual needs, or may be determined according to experimental data, and is not limited herein.
The working principle of the strip-shaped common electrode and the data line of the embedded electromagnetic touch display screen in the two stages of image display and touch detection is described in the following by combining the drawings of the specification.
First, the operation principle of the data line in the two stages of image display and touch detection will be described.
Specifically, the first switching unit 21 includes a plurality of first TFTs 24 and a first control line 31.
The in-cell electromagnetic touch display further includes a second switching unit 22, and the second switching unit 22 includes a plurality of second TFTs 25, a second control line 32, and a first detecting unit 35.
Fig. 8 is a schematic structural diagram of the connection between the first switch unit and the data line.
As can be seen from fig. 8, the gate electrode of each of the first TFTs 24 is electrically connected to the first control line 31, the source electrode (or drain electrode) is electrically connected to one end of one of the at least two data lines, and the drain electrode (or corresponding source electrode) is electrically connected to one end of the other of the at least two data lines.
In fig. 8, the source and the drain of the first TFT24 are electrically connected to two data lines at the upper end of the drawing, respectively, but the present invention is not limited thereto.
The gate of each of the second TFTs 25 is electrically connected to the second control line 32, the source (or drain) is electrically connected to one end of a corresponding one of the second direction coils, and the drain (or corresponding source) is electrically connected to the first detection cell 25.
Specifically, in the image display, the first switching unit 21 is turned off so that each data line 13 transmits a display signal, including:
the first control line 31 is applied with a set first voltage to turn off all the first TFTs 24, the second control line 32 is applied with a set second voltage to turn off all the second TFTs 25, so that the data lines 13 are independently distributed to transmit display signals, respectively;
at the time of touch detection, the first switching unit 21 is turned on so that a plurality of first direction coils formed by the plurality of data lines 13 induce electromagnetic signals, and outputs induced currents to determine a second direction coordinate of a touch position, including:
the first control line 31 is applied with a set third voltage, and all the first TFTs 24 are turned on so that at least two data 13 lines electrically connected through the first TFTs form independent first direction coils; the first data line and the second data line are electrically connected from left to right through the first TFT24 to form a first direction coil; the third data line and the fourth data line are electrically connected through a second first TFT24 to form a second first direction coil; ...; and so on.
The second control line 32 is applied with a set fourth voltage, and the first direction coil subjected to electromagnetic induction generates an induction current, and is detected by the first detecting unit 35 to determine the second direction coordinate of the output touch position.
Next, the operation principle of the strip-shaped common electrode line in the two stages of image display and touch detection is described.
The in-cell electromagnetic touch display further includes a third switching unit 23, the third switching unit 23 includes a plurality of third TFTs 26, a third control line 33, and a common electrode line 34, and the in-cell electromagnetic touch display further includes: the second detecting unit 36 electrically connected to the source (or drain) of each of the third TFTs 26 is a schematic structural diagram of the third switching unit connected to the strip-shaped common electrode, as shown in fig. 9.
As can be seen from fig. 9, the gate of each third TFT26 is electrically connected to the third control line 33, the source (or drain) is electrically connected to one end of a corresponding one of the second direction coils, and the drain (or corresponding source) is electrically connected to the common electrode line 34.
Specifically, when displaying an image, a common voltage is applied to all the strip-shaped common electrodes 14, including:
in displaying an image, the third control line 33 is applied with the set fifth voltage, all the third TFTs 26 are turned on, and the common voltage applied to the common electrode line 34 is transmitted to all the stripe-shaped common electrodes 14 through the turned-on third TFTs 26.
During touch detection, all the strip-shaped common electrodes 14 form independent multiple second direction coil induction electromagnetic signals, and output induction currents to determine a first direction coordinate of a touch position, which specifically includes:
in the touch detection, the third control line 33 is applied with the set sixth voltage, all the third TFTs 26 are turned off, and the respective second direction coils are independent of each other;
the second direction coil, which is subjected to the electromagnetic induction, generates an induced current, and is detected by the second detecting unit 36 to determine the first direction coordinate of the touch position.
Specifically, the detection of the magnitude of the current passing through the first direction coil or the second direction coil can be realized by the following steps:
a passive electromagnetic pointer (or an electromagnetic pen) is matched with the electromagnetic screen, and a resonance circuit is arranged in the passive electromagnetic pointer (or the electromagnetic pen). The embedded electromagnetic touch display screen emits high-frequency electromagnetic waves to emit energy into the passive electromagnetic pointer, then the passive electromagnetic pointer returns an electromagnetic signal to the embedded electromagnetic touch display screen, the embedded electromagnetic touch display screen stops emitting the electromagnetic waves at the moment and is switched to an electromagnetic wave receiving mode, when the electromagnetic pointer is nearby, an electromagnetic induction effect occurs in the embedded electromagnetic touch display screen, the electromagnetic induction detection unit detects induced currents at the moment, the position and the pointer direction of the electromagnetic pointer are further determined, and the direction of the electromagnetic coil can be determined.
The in-cell electromagnetic touch display screen related to the invention is at least one of an LCD, an OLED and electronic paper.
Through the scheme of the invention, transparent strip-shaped common electrodes are arranged, at least two strip-shaped common electrodes are connected to form a first direction coil, a plurality of data lines which are insulated and distributed in a crossed way with the strip-shaped common electrodes are arranged, at least two data lines are electrically connected through a first switch unit to form a second direction coil, when an image is displayed, the same common voltage is applied to all the strip-shaped common electrodes, the first switch unit is disconnected, so that the data lines respectively transmit display signals, when in touch detection, all the strip-shaped common electrodes form independent first direction coils to induce electromagnetic signals and output induced current to determine a second direction coordinate of a touch position, the first switch unit is connected, so that a plurality of second direction coils formed by the data lines induce electromagnetic signals and output induced current to determine the first direction coordinate of the touch position, therefore, a common electrode layer on the existing display panel is split into transparent and strip-shaped common electrodes, and a plurality of strip-shaped common electrodes are electrically connected and a plurality of data lines which are distributed in a crossed manner with the common electrodes are electrically connected, so that all the strip-shaped common electrodes reach a uniform potential within the display time, the function of the common electrode layer is realized, and the aperture ratio of the display screen is ensured; in the touch control time, at least two public electrodes form independent first direction coils to induce electromagnetic signals, at least two data lines form independent second direction coils to induce electromagnetic signals, and induction coordinates are determined according to the induction current, so that the electromagnetic touch effect is achieved under the condition that other equipment is not additionally arranged on the display screen equipment.
In addition, the invention also provides a structural schematic diagram of the touch display device, and the touch display device comprises the embedded electromagnetic touch display screen.
The embedded electromagnetic touch display screen is the embedded touch display screen.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. The utility model provides an embedded electromagnetism touch display screen, includes relative first base plate and the second base plate that sets up, its characterized in that, embedded electromagnetism touch display screen still includes:
the data lines are arranged on the first substrate and on one side facing the second substrate, wherein at least two data lines are electrically connected through a first switch unit to form a first direction coil;
the plurality of transparent strip-shaped common electrodes are distributed in an insulated and crossed manner with the data wire, wherein at least two strip-shaped common electrodes are electrically connected to form a second direction coil;
when an image is displayed, the same common voltage is applied to all the strip-shaped common electrodes, and the first switch unit is switched off to enable all the data lines to transmit display signals respectively;
when touch detection is performed, the first switch unit is switched on, so that a plurality of first direction coils formed by the data lines induce electromagnetic signals, induced currents are output to determine a second direction coordinate of a touch position, and all the strip-shaped common electrodes form a plurality of independent second direction coils to induce electromagnetic signals, and induced currents are output to determine the first direction coordinate of the touch position.
2. The in-cell electromagnetic touch display screen of claim 1, wherein the strip-shaped common electrodes are disposed on a side of the first substrate facing the second substrate; or,
the strip-shaped common electrode is disposed on a side of the second substrate facing the first substrate.
3. The in-cell electromagnetic touch display panel of claim 1, wherein at least two of the strip-shaped common electrodes are electrically connected to form a second direction coil, comprising:
two adjacent strip-shaped common electrodes are in a group, and one end of each group of the two strip-shaped common electrodes is electrically connected through a lead to form a second direction coil.
4. The in-cell electromagnetic touch display panel of claim 1, wherein at least two of the strip-shaped common electrodes are electrically connected to form a second direction coil, comprising:
the three adjacent strip-shaped common electrodes are in one group, wherein the three adjacent strip-shaped common electrodes in each group are sequentially a first strip-shaped common electrode, a second strip-shaped common electrode and a third strip-shaped common electrode;
the first strip-shaped common electrode is electrically connected with the third strip-shaped common electrode at a first end through a conducting wire, the second strip-shaped common electrode is electrically connected with the third strip-shaped common electrode at a second end through a conducting wire to form a second direction coil, and the first end and the second end are respectively located at two different ends of the three strip-shaped common electrodes.
5. The in-cell electromagnetic touch display panel of claim 1, wherein at least two of the strip-shaped common electrodes are electrically connected to form a second direction coil, comprising:
the three adjacent strip-shaped common electrodes are in one group, wherein the three adjacent strip-shaped common electrodes in each group are sequentially a first strip-shaped common electrode, a second strip-shaped common electrode and a third strip-shaped common electrode;
the first strip-shaped common electrode is electrically connected with the second strip-shaped common electrode at a first end through a lead, and the second strip-shaped common electrode is electrically connected with the third strip-shaped common electrode at the first end through a lead so as to form a second direction coil.
6. The in-cell electromagnetic touch display panel of claim 1, wherein at least two of the strip-shaped common electrodes are electrically connected to form a second direction coil, comprising:
and at least two strip-shaped common electrodes with set values at intervals are electrically connected at one end of each of the two strip-shaped common electrodes through a lead to form a second-direction coil.
7. The in-cell electromagnetic touch display screen of any of claims 1-6, further comprising: and the pixel unit array comprises a plurality of rows or columns of pixel units in the area occupied by each strip-shaped common electrode.
8. The in-cell electromagnetic touch display panel according to any of claims 1 to 6, wherein the first switch unit comprises a plurality of first TFTs and first control lines;
the in-cell electromagnetic touch display screen further comprises a second switch unit, wherein the second switch unit comprises a plurality of second TFTs, a second control line and a first detection unit, and the second switch unit comprises:
a gate electrode of each first TFT is electrically connected to the first control line, a source electrode or a drain electrode is electrically connected to one end of one of the at least two data lines, and a drain electrode or a source electrode is electrically connected to one end of the other of the at least two data lines;
the grid electrode of each second TFT is electrically connected with the second control line, the source electrode or the drain electrode is electrically connected with one end of the corresponding first direction coil, and the drain electrode or the source electrode is electrically connected with the first detection unit;
when the image is displayed, the first switch unit is switched off to enable each data line to transmit the display signal respectively, and the method comprises the following steps:
the first control line is applied with a set first voltage to disconnect all the first TFTs, the second control line is applied with a set second voltage to disconnect all the second TFTs, so that each data line is independently distributed to respectively transmit display signals;
when the touch detection is performed, the first switch unit is turned on to enable a plurality of first direction coils formed by the plurality of data lines to induce electromagnetic signals, and the induced current is output to determine a second direction coordinate of the touch position, including:
the first control line is applied with a set third voltage, and all the first TFTs are conducted, so that at least two data lines electrically connected through the first TFTs form independent first direction coils;
the second control line is applied with a set fourth voltage, the first directional coil subjected to electromagnetic induction generates induction current, and the induction current is detected by the first detection unit to determine a second directional coordinate of the output touch position.
9. The in-cell electromagnetic touch display panel according to any one of claims 1 to 6, further comprising a third switching unit including a plurality of third TFTs, third control lines, and common electrode lines, wherein:
a gate of each third TFT is electrically connected to the third control line, a source or a drain is electrically connected to one end of a corresponding one of the second directional coils, and the drain or the source is electrically connected to the common electrode line;
when the image is displayed, a common voltage is applied to all the strip-shaped common electrodes, and the method comprises the following steps:
when the image is displayed, the third control line is applied with a set fifth voltage, all the third TFTs are started, and the common voltage applied to the common electrode line is transmitted to all the strip-shaped common electrodes through the started third TFTs.
10. The in-cell electromagnetic touch display screen of claim 9, further comprising: a second detection unit electrically connected to a source or drain of each of the third TFTs;
during touch detection, all the strip-shaped common electrodes form a plurality of independent second direction coil induction electromagnetic signals and output induction current to determine a first direction coordinate of a touch position, and the method specifically comprises the following steps:
when the touch detection is carried out, a set sixth voltage is applied to the third control line, all the third TFTs are disconnected, and the second directional coils are independent of one another;
the second direction coil subjected to the electromagnetic induction generates an induced current, and the induced current is detected by the second detection unit to determine a first direction coordinate of the touch position.
11. The in-cell electromagnetic touch display screen of claim 1, wherein the in-cell electromagnetic touch display screen is one of an LCD, an OLED, and electronic paper.
12. A touch display device, comprising the in-cell electromagnetic touch display screen according to any one of claims 1 to 11.
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