CN103941950A - Inductance touch screen, inductance touch display panel and inductance touch display device - Google Patents

Abstract

The embodiment of the present invention discloses an inductive touch screen, an inductive touch display panel, and an inductive touch display device. The inductive touch screen includes: a first substrate and a touch structure layer arranged on the first substrate, and the touch structure layer includes: A first wire; a plurality of second wires, insulated and intersected with the plurality of first wires; a plurality of inductance coils, each inductance coil is arranged at the intersection of the first wire and the second wire; the inductive touch screen also includes : a first switch unit, including a plurality of first switches, each first switch connected in series with a said first wire; a second switch unit, including a plurality of second switches, each second switch connected with a said first wire The second wire is connected in series; wherein, since the first switch unit and the second switch unit are turned on alternately, the number of ports for shunting the induced current is greatly reduced, the detected effective signal strength is improved, and the signal-to-noise ratio is improved.

Description

Inductive touch screen, inductive touch display panel and inductive touch display device

technical field

The present invention relates to the field of inductive touch, in particular to an inductive touch screen, an inductive touch display panel including the inductive touch screen, an inductive touch display device including the inductive touch screen, and an inductive touch display device including the inductive touch display panel.

Background technique

In recent years, with the development of humanization and convenience, touch screens, display panels and display devices with touch functions are increasingly favored by people. According to different working principles, there are many types of touch screens, such as resistive touch screen (Resistive-type Touch Panel), capacitive touch screen (Capacitive-type Touch Panel), inductive touch screen (Electromagnetic-type Touch Panel) and so on. Among them, the advantage of resistive touch screen and capacitive touch screen is that they can be directly operated by hand. But when writing with a pen, because the palm is generally placed on the touch screen, it is difficult to distinguish the touch of the hand and the pen accurately. The inductive touch screen mainly includes a plurality of inductive coils or antennas arranged along the X and Y directions, and a position pointing device (such as an electromagnetic pen). Even when the palm is placed on the touch screen, the inductive touch screen can accurately determine the position of the electromagnetic pen.

A Chinese patent application document with application number 200810065796.3 discloses an inductive touch screen, the circuit structure diagram of which is shown in FIG. 1 . As shown in Figure 1, the inductive touch screen includes a plurality of X-direction detection lines 11, a plurality of Y-direction detection lines 12 that are insulated and intersected with the plurality of X-direction detection lines 11, and a plurality of coils 13 arranged in a matrix (in the figure, 3 ×3 coil matrix as an example), each coil 13 is arranged at the intersection of the X-direction detection line 11 and the Y-direction detection line 12 . Each coil 13 has two ends, the first end is connected to the corresponding X direction detection line 11 and the Y direction detection line 12 at the same time, and the other end is grounded through the common electrode line 17 . Each X-direction detection line 11 and Y-direction detection line 12 is connected to the corresponding X-direction detection circuit 15 and Y-direction detection circuit 16 through a current amplifier. If the electromagnetic pen causes an inductive coil 13 to generate an induced current, the induced current will be detected by the X-direction detection circuit 15 and the Y-direction detection circuit 16 , so as to determine the coordinates of the touch location.

However, it can be further seen from FIG. 1 that since the X-direction detection line 11 and the Y-direction detection line 12 are connected through one end of the inductance coil 13, for any inductance coil 13, it is indicated by the dotted line in the figure. Taking the shown inductance coil as an example, the induced current I0 generated by it will be transmitted to all detection ports through the X-direction detection line 11 and the Y-direction detection line 12 electrically connected to each other. That is, the induced current I0 will be transmitted to all detection ports in the X direction and Y direction through the path shown by the dotted line in the figure, and each port can detect the induced currents Ix1, Ix2, Ix3, Iy1, Iy2, and Iy3 respectively. That is to say, the current induced by any inductance coil will be divided into six parts, that is, Ix1, Ix2, Ix3, Iy1, Iy2, and Iy3. The X-direction detection circuit 15 needs to select a maximum current from Ix1, Ix2, and Ix3 to determine the X-direction coordinate of the touch position; the Y-direction detection circuit 16 needs to select a maximum current from Iy1, Iy2, and Iy3 to determine the touch position. Determine the Y coordinate of the touch position. However, since the induced current I0 is divided into six parts, the strength of the effective signal is greatly reduced, and the signal-to-noise ratio is reduced. In addition, because the difference between the six current values Ix1, Ix2, Ix3, Iy1, Iy2, and Iy3 will be reduced due to the mutual conduction between the X-direction detection line 11 and the Y-direction detection line 12, the difficulty of detection will increase. .

Contents of the invention

A technical problem to be solved by the embodiments of the present invention is that in the prior art, the induction current generated by the inductance coil at the touch position is shunted to all detection ports, and the detected effective signal strength is relatively small and the signal-to-noise ratio is low.

In order to solve the above technical problems, an embodiment of the present invention provides an inductive touch screen, comprising: a first substrate and a touch structure layer disposed on the first substrate, the touch structure layer comprising: a plurality of first wires; A plurality of second wires, insulated and intersected with the plurality of first wires; a plurality of inductance coils, each inductance coil is arranged at the intersection of the first wires and second wires, and each inductance coil includes a The first terminal electrically connected to the first wire and the second wire, and a second terminal grounded; the inductive touch screen also includes: a first switch unit, including a plurality of first switches, each first switch connected to a The first wire is connected in series; a second switch unit includes a plurality of second switches, and each second switch is connected in series with one of the second wires; wherein, the first switch unit and the second switch unit are turned on alternately , when the magnetic flux passes through an inductive coil, the induced current generated by the inductive coil is transmitted to the correspondingly connected first wire and second wire through the first terminal of the inductive coil, so that the inductive touch screen is determined by the induced current The location coordinates of the touch. Specifically, when the first switch unit is turned on, the second switch unit is turned off, and the inductive touch screen determines the first direction coordinate value of the touch position through the induced current; when the second switch unit is turned on, the The first switch unit is turned off, and the inductive touch screen determines the second direction coordinate value of the touch position through the induced current.

An embodiment of the present invention also provides an inductive touch display panel, including the above-mentioned inductive touch screen.

An embodiment of the present invention also provides an inductive touch display device including the above-mentioned inductive touch display panel.

An embodiment of the present invention also provides an inductive touch display device including a display panel and the above-mentioned inductive touch screen, wherein the display panel and the inductive touch screen are stacked.

Compared with the prior art, the inductive touch screen provided by the embodiments of the present invention includes an inductive touch display panel including the inductive touch screen, an inductive touch display device including the inductive touch screen, and an inductive touch display device including the inductive touch display panel. Among them, the first switch unit and the second switch unit are turned on alternately, which greatly reduces the number of ports for shunting the induced current, increases the effective induced current detected by the detection terminal, and improves the detected effective signal strength , which provides the signal-to-noise ratio.

Description of drawings

FIG. 1 is a schematic diagram of a circuit structure of an inductive touch screen in the prior art;

FIG. 2 is a schematic top view of the inductive touch screen provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic top view of the inductive touch screen provided by Embodiment 2 of the present invention;

4 is a cross-sectional view of an inductive touch display panel provided by Embodiment 3 of the present invention;

FIG. 5 is a schematic top view structure diagram of a pixel array provided by Embodiment 3 of the present invention.

Detailed ways

The core idea of the present invention is to add a first switch unit at the detection end in the first direction (X direction), add a second switch unit at the detection end in the second direction (Y direction), and the first switch unit and the second switch unit open alternately. The detection in the first direction (X direction) and the detection in the second direction (Y direction) are not carried out at the same time, that is, when the detection is performed in the first direction (X direction), all the detection terminals in the second direction (Y direction) are closed; When detecting in two directions (Y direction), close all detection terminals in the first direction (X direction). In this way, for one detection, the induced current generated by any inductance coil is only shunted to all detection terminals in the first direction (X direction), or only shunted to all detection terminals in the second direction (Y direction), which greatly reduces the The number of ports for shunting the induced current increases the effective induced current detected by the detection terminal, improves the detected effective signal strength, and improves the signal-to-noise ratio.

Embodiment one

A schematic top view structure diagram of the inductive touch screen provided by Embodiment 1 of the present invention is shown in FIG. 2 . It can be seen from FIG. 2 that the inductive touch screen 1 includes: a first substrate 10 and a touch structure layer disposed on the first substrate 10 .

The touch structure layer includes: a plurality of first wires 101; a plurality of second wires 102, insulated and intersected with a plurality of first wires 101; a plurality of inductance coils 103, each inductance coil 103 is arranged on the first wire 101 and the second wire At the intersection of the two wires 102 , each inductance coil 103 includes a first terminal 1031 electrically connected to the first wire 101 and the second wire 102 , and a second terminal 1032 connected to ground. Usually, an insulating layer (not shown in the figure) is arranged between the first wire 101 and the second wire 102, and the inductance coil 103 can be located on the same layer as the first wire 101, using the same material, or can be located on the same layer as the second wire 102. layer, using the same material. In addition, the first terminal 1031 of the inductance coil 103 includes a first sub-terminal 1031A electrically connected to the corresponding first wire 101 ; a second sub-terminal 1031B electrically connected to the corresponding second wire 102 . The second terminal 1032 of the inductor coil 103 can be grounded through a common electrode line 107 . In FIG. 2 , it is taken as an example that there are multiple common electrode lines 107 , but it may also be a monolithic structure (such as ITO). The common electrode wire 107 may be located on the same layer as one of the first wire 101 , the second wire 102 , and the inductance coil 103 , and use the same material. In addition, the plurality of first conducting wires 101 are generally arranged parallel or substantially parallel, and the plurality of second conducting wires 102 are generally arranged parallel or substantially parallel.

The inductive touch screen 1 also includes: a first switch unit 108, including a plurality of first switches 109, each first switch 109 connected in series with a first wire 101; a second switch unit 111, including a plurality of second The switches 112 , each second switch 112 is connected in series with a second wire 102 . In FIG. 2 , the first switch 109 and the second switch 112 are taken as thin film transistors as an example, so that the first switch 109 and the second switch 112 can be directly disposed on the first substrate 10 . However, the first switch 109 and the second switch 112 may also use other devices or circuits with switching functions, such as field effect transistors (MOSFETs), which may be arranged in an external IC. Thin film transistors or field effect transistors can be either N-type or P-type.

Wherein, the first switch unit 108 and the second switch unit 111 are turned on alternately. When the magnetic field line passes through an inductance coil 103, the induced current generated by the inductance coil 103 is transmitted to the correspondingly connected first terminal 1031 of the inductance coil 103. A wire 101 and a second wire 102, so that the inductive touch screen 1 can determine the coordinates of the touched position through the induction current. Specifically, when the first switch unit 108 is turned on, the second switch unit 111 is turned off, and the inductive touch screen 1 determines the coordinate value of the touch position in the first direction (X direction) through the induced current; when the second switch unit 111 is turned on, the first switch The unit 108 is turned off, and the inductive touch screen 1 determines the coordinate value of the touch position in the second direction (Y direction) through the induced current.

Taking the first switch 109 and the second switch 112 as thin film transistors as an example, the first switch unit 108 also includes a first control line 110 to simultaneously control the switching states of multiple first switches 109; the second switch unit 111 includes a first The second control line 113 controls the switching states of multiple second switches 112 at the same time. In addition, the inductive touch screen 1 also includes a first direction detection circuit 105 and a second direction detection circuit 106; each first wire 101 is electrically connected to the first direction detection circuit 105 through a first switch 109; A second switch 112 is electrically connected to the second direction detection circuit 106 . Specifically, each first wire 101 passes through the first switch 109 connected in series with the first direction detection circuit 105, the first wire 101 is electrically connected to the source/drain of the first switch 109, and the drain of the first switch 109 The pole/source is electrically connected to the first direction detection circuit 105 , and the gate of the first switch 109 is electrically connected to the first control line 110 . Each second wire 102 passes through the second switch 112 connected in series with the second direction detection circuit 106, the second wire 102 is electrically connected to the source/drain of the second switch 112, and the drain/source of the second switch 112 It is electrically connected to the second direction detection circuit 106 , and the gate of the second switch 112 is electrically connected to the second control line 113 . The first control signal CK is applied to the first control line 110 , and the second control signal CKB is applied to the second control line 113 ; the first control signal CK and the second control signal CKB are mutually inverted signals. When CK is a valid signal, CKB is an invalid signal, and the first switch 109 in the first switch unit 108 is turned on. At this time, if the inductive coil 103 generates an induced current, the first direction detection circuit 105 will start from each first direction detection circuit 105. The induced currents Ix1, Ix2, and Ix3 are detected on the wire 101, the magnitudes of the induced currents Ix1, Ix2, and Ix3 are compared, and the largest current is selected to determine the first direction (X direction) coordinate of the touch position. When CK is an invalid signal, CKB is a valid signal, and the second switch 112 in the second switch unit 111 is turned on. At this time, if the inductance coil 103 generates an induced current, the second direction detection circuit 106 will generate a current from each second direction. The induced currents Iy1, Iy2, and Iy3 are detected on the wire 102, the magnitudes of the induced currents Iy1, Iy2, and Iy3 are compared, and the largest current is selected to determine the second direction (Y direction) coordinate of the touch position. It can be seen from this that the first switch unit 108 and the second switch unit 111 are turned on alternately. The detection in the first direction (X direction) and the detection in the second direction (Y direction) are not carried out at the same time, that is, when the detection is performed in the first direction (X direction), all the detection terminals in the second direction (Y direction) are closed; When detecting in two directions (Y direction), close all detection terminals in the first direction (X direction). In this way, for one detection, the induced current generated by any inductance coil is only shunted to all detection terminals in the first direction (X direction), or only shunted to all detection terminals in the second direction (Y direction), which greatly reduces the The number of ports for shunting the induced current increases the effective induced current detected by the detection terminal, improves the detected effective signal strength, and improves the signal-to-noise ratio.

In addition, in order to further increase the strength of the detection signal, the inductive touch screen 1 also includes a plurality of current amplifiers 114, and each first wire 101 is electrically connected to the first direction detection circuit 105 through a first switch 109 and a current amplifier 114; A second wire 102 is electrically connected to the second direction detection circuit 106 through a second switch 111 and a current amplifier 114 . Of course, the order of the first switch 109 and the current amplifier 114 can be adjusted arbitrarily, and the order of the second switch 112 and the current amplifier 114 can also be adjusted arbitrarily.

Embodiment two

A schematic top view structure diagram of the inductive touch screen provided by Embodiment 2 of the present invention is shown in FIG. 3 . The inductive touch screen provided in this embodiment is improved on the basis of the inductive touch screen provided in the first embodiment, and the same parts as those in the first embodiment will not be repeated, and the differences will be focused on.

As can be seen from FIG. 3 , the inductive touch screen 1 also includes a first control circuit 115 and a third switch unit 116; the third switch unit 116 includes a plurality of third switches 117, and each third switch 117 is connected to a first wire 101 In series, the first control circuit 115 controls the plurality of third switches 117 to open one by one when the first switch unit 108 is opened; and/or, the inductive touch screen 1 also includes a second control circuit 118 and a fourth switch unit 119; the fourth switch The unit 119 includes a plurality of fourth switches 120 , each fourth switch 120 is connected in series with a second wire 102 , and the second control circuit 118 controls the plurality of fourth switches 120 to be turned on one by one when the second switch unit 111 is turned on. It should be noted that, in this embodiment, the inductive touch screen 1 may only include the first control circuit 115 and the third switch unit 116, or only include the second control circuit 118 and the fourth switch unit 119, or may also include the first control circuit 115 and the third switch unit 116. The circuit 115 and the third switch unit 116 , the second control circuit 118 and the fourth switch unit 119 .

As a preferred embodiment, the above-mentioned first control circuit 115 and/or second control circuit 118 may be a shift register circuit, may be composed of TFTs, and may be disposed on the first substrate 10 ; or may be disposed in an external IC. In addition, the order of the first control circuit 115, the third switch unit 116, the current amplifier 114, and the first switch 109 can be adjusted arbitrarily; The sequence can also be adjusted arbitrarily.

Embodiment Three

The inductive touch display panel provided in Embodiment 3 of the present invention includes the inductive touch screen provided in any one of Embodiment 1 and Embodiment 2 above. The inductive touch display panel can be a liquid crystal display panel or an electronic paper or a plasma display panel or an organic light emitting diode display panel.

When the inductive touch display panel is a liquid crystal display panel, its cross-sectional view is shown in FIG. 4 . It can be seen from FIG. 4 that the inductive touch display panel 2 further includes a second substrate 20 disposed opposite to the first substrate 10 , and a liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20 . The first substrate 10 and the second substrate 20 can be made of glass, quartz, plastic and other materials. A pixel array 40 is further disposed between the liquid crystal layer 30 and the first substrate 10 , and its top view structural diagram is shown in FIG. 5 . It can be seen from FIG. 5 that the pixel array 40 includes a plurality of third conductive wires 401 and a plurality of fourth conductive wires 402 that are insulated and intersect. The pixel array 40 further includes a TFT arranged at the intersection of the third wire 401 and the fourth wire 402 . The touch structure layer and the pixel array 40 can be fabricated together in the same process flow; even part or all of the touch structure layer can directly use the existing structure in the pixel array 40 . For example, the first wire 101 and the third wire 401 are located on the same layer and use the same material, and the second wire 102 and the fourth wire 402 are located on the same layer and use the same material. Alternatively, the first wire 101 directly uses the third wire 401 , and the second wire 102 directly uses the fourth wire 402 . In this case, the inductance detection and display work in a time-sharing manner. In this embodiment, the third wire is used as a scan line and the fourth wire is used as a data line as an example, but in fact the third wire and the fourth wire can be a scan line, a data line, a storage capacitor electrode line, a bias line, and a repair line. , control lines, etc. insulated and crossed two lines. In addition, the plurality of third conducting wires 401 are generally arranged parallel or substantially parallel, and the plurality of fourth conducting wires 402 are generally arranged parallel or substantially parallel.

Embodiment Four

The inductive touch display device provided in Embodiment 4 of the present invention includes the inductive touch display panel provided in Embodiment 3 above.

The inductive touch display device provided in Embodiment 4 of the present invention may also include a display panel and the inductive touch screen provided in any one of Embodiment 1 and Embodiment 2 above, and the display panel is stacked with the inductive touch screen.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (20)

1. an inductance touch-screen, comprising: first substrate and be arranged at the touch structural sheet on described first substrate, and described touch structural sheet comprises: many first wires; Many the second wires, intersect with described many first wire insulations; A plurality of telefaults, each telefault is arranged at the infall of described the first wire and the second wire, and each telefault comprises a first terminal being electrically connected to described the first wire and the second wire, and the second terminal of a ground connection;

Described inductance touch-screen also comprises: one first switch element, comprise a plurality of the first switches, and each first switch is connected with the first wire described in; One second switch unit, comprises a plurality of second switches, and each second switch is connected with the second wire described in;

Wherein, described the first switch element and described second switch units alternately are opened, when the magnetic line of force passes a telefault, the induction current that this telefault produces transfers to corresponding the first wire and the second wire connecting by the first terminal of this telefault, thereby makes described inductance touch-screen by described induction current, determine the position coordinates touching.

2. inductance touch-screen according to claim 1, is characterized in that, described the first terminal comprises: the first sub-terminal, is electrically connected to corresponding the first wire; The second sub-terminal, is electrically connected to corresponding the second wire.

3. inductance touch-screen according to claim 1, is characterized in that, described the first switch and/or described second switch are thin film transistor (TFT), are arranged on described first substrate.

4. inductance touch-screen according to claim 1, is characterized in that, described the first switch and/or described second switch are field effect transistor, are arranged in exterior I C.

5. inductance touch-screen according to claim 1, is characterized in that, when described the first switch element is opened, described second switch unit is closed, and described inductance touch-screen is determined the first direction coordinate figure of touch location by described induction current; When described second switch unit is opened, described the first switch element is closed, and described inductance touch-screen is determined the second direction coordinate figure of touch location by described induction current.

6. inductance touch-screen according to claim 1, is characterized in that, described inductance touch-screen also comprises first direction testing circuit and second direction testing circuit; Described in each, the first wire is electrically connected to described first direction testing circuit by the first switch described in; Described in each, the second wire is electrically connected to described second direction testing circuit by second switch described in.

7. inductance touch-screen according to claim 6, is characterized in that, described inductance touch-screen also comprises a plurality of current amplifiers, and each first wire is electrically connected to described first direction testing circuit by one first switch and a current amplifier; Each second wire is electrically connected to described second direction testing circuit by a second switch and a current amplifier.

8. inductance touch-screen according to claim 1, is characterized in that, described the first switch element also comprises one first control line, controls the on off state of described a plurality of the first switches simultaneously; Described second switch unit comprises one second control line, controls the on off state of described a plurality of second switches simultaneously.

9. inductance touch-screen according to claim 8, is characterized in that, described inductance touch-screen also comprises first control circuit and the 3rd switch element; Described the 3rd switch element comprises a plurality of the 3rd switches, and each the 3rd switch is connected with the first wire described in, and described first control circuit is controlled described a plurality of the 3rd switches and opened one by one when described the first switch element is opened; And/or described inductance touch-screen also comprises second control circuit and the 4th switch element; Described the 4th switch element comprises a plurality of the 4th switches, and each the 4th switch is connected with the second wire described in, and described second control circuit is controlled when described a plurality of the 4th switches are opened in described second switch unit and opened one by one.

10. inductance touch-screen according to claim 8, is characterized in that, described first control circuit and/or described second control circuit are shift register circuit.

11. inductance touch-screens according to claim 8, is characterized in that, described first control circuit and/or described second control circuit are arranged on described first substrate.

12. inductance touch-screens according to claim 8, is characterized in that, described first control circuit and/or described second control circuit are arranged in exterior I C.

13. 1 kinds of inductance touch display panels, comprise the inductance touch-screen as described in claim 1-12 any one.

The 14. inductance touch display panels of stating according to claim 13, is characterized in that, described inductance touch display panel is display panels or Electronic Paper or Plasmia indicating panel or organic LED display panel.

15. inductance touch display panels according to claim 13, is characterized in that, described inductance touch display panel also comprises the second substrate being oppositely arranged with described first substrate, and are arranged at the liquid crystal layer between described first substrate and second substrate.

16. inductance touch display panels according to claim 13, it is characterized in that, described inductance touch display panel also comprises the pel array being arranged on described first substrate, and described pel array comprises many privates and many privates that insulation intersects.

17. inductance touch display panels according to claim 16, is characterized in that, described the first wire and described privates are positioned at same layer and adopt same material, and described the second wire and described privates are positioned at same layer and adopt same material; Or described the first wire directly adopts privates, described the second wire directly adopts privates, and inductance detection and demonstration time-sharing work.

18. according to the inductance touch display panel described in claim 16 or 17, it is characterized in that, described privates, privates are two lines that in sweep trace, data line, storage capacitor electrode line, bias line, patch cord, control line, insulation intersects.

19. 1 kinds of inductance touch display units, comprise the inductance touch display panel as described in claim 13-18 any one.

20. 1 kinds of inductance touch display units, comprise the inductance touch-screen described in display panel and claim 1-12 any one, and described display panel and described inductance touch screen stack-ups arrange.