OLED touch-control display panel and electronic device

Abstract

The embodiments of the present disclosure relate to the technical field of display. Provided are an OLED touch-control display panel and an electronic device. The OLED touch-control display panel comprises: a TFT substrate, an OLED display layer, a touch-control layer, a plurality of first traces arranged at intervals in a first direction, a plurality of second traces arranged at intervals in a second direction, a plurality of first ground wires arranged at intervals in the first direction, and a plurality of second ground wires arranged at intervals in the second direction, wherein each first ground wire is electrically connected to a corresponding first trace by means of a first TFT switch transistor, and each second ground wire is connected to a corresponding second trace by means of a second TFT switch transistor. The OLED touch-control display panel further comprises a controller, which is used for controlling the first TFT switch transistor and the second TFT switch transistor to switch on or off in response to a control signal. The embodiments of the present disclosure at least realize low-cost electromagnetic and capacitor induction compatibility requirements, and do not increase the process difficulty and process cost of OLED touch-control display panels.

Description

OLED touch display panels and electronic devices

[0001] Cross-references

[0002] This disclosure claims priority to Chinese patent application number 202410263433.X, entitled “OLED touch display panel and electronic device,” filed on March 7, 2024, which is incorporated herein by reference in its entirety. Technical Field

[0003] The embodiments of the present disclosure relate to the field of display technology, and in particular to an OLED touch display panel and an electronic device. Background Art

[0004] Currently, electronic devices such as mobile phones and tablets include OLED (Organic Light-Emitting Diode) touch display panels to enable touch control of the electronic device. The touch control technologies used in OLED touch display panels generally include electromagnetic induction touch and capacitive induction touch. When the OLED touch display panel uses capacitive induction touch technology, the user can touch the electronic device with a finger or a capacitive stylus. When the OLED touch display panel uses electromagnetic induction touch technology, the user can touch the electronic device with an electromagnetic stylus.

[0005] However, there is currently a demand for realizing both capacitive sensing and electromagnetic induction, which puts forward more requirements on the practicality of OLED touch display panels.

[0006] Summary of the Invention

[0007] The embodiments of the present disclosure provide an OLED touch display panel and an electronic device, which achieve low-cost electromagnetic capacitance induction compatibility requirements without increasing the process difficulty and process cost of the OLED touch display panel.

[0008] According to some embodiments of the present disclosure, on one hand, an OLED touch display panel is provided, comprising: an OLED touch display panel comprising: a TFT substrate, wherein the TFT substrate has a driving circuit therein; an OLED display layer, wherein the OLED display layer is located on the TFT substrate, and the driving circuit is used to drive the OLED display layer to emit light; a touch layer, wherein the touch layer is located on a surface of the OLED display layer away from the TFT substrate; wherein the touch layer comprises: a plurality of first traces arranged at intervals along a first direction, wherein the first traces extend along a second direction, and the second direction is different from the first direction; a plurality of second traces arranged at intervals along the second direction, wherein the second traces extend along the first direction, and the second traces are insulated and cross-arranged with the first traces; a plurality of first ground lines arranged at intervals along the first direction, wherein the first ground lines are located between adjacent first traces, and the first ground lines are located between adjacent first traces. A ground line corresponds one-to-one to the first routing line, and the first ground line is electrically connected to the corresponding first routing line via a first TFT switch tube; a plurality of second ground lines are arranged at intervals along the second direction, the second ground lines are located between adjacent second routing lines, the second ground lines correspond one-to-one to the second routing lines, and the second ground lines are electrically connected to the corresponding second routing line via a second TFT switch; wherein the first TFT switch tube and the second TFT switch tube are both located in the TFT substrate; a controller, the controller is used to provide a control signal, the first TFT switch tube and the second TFT switch tube are turned on or off in response to the control signal, wherein when the first TFT switch tube and the second TFT switch tube are turned on, the touch layer performs an electromagnetic induction operation, and when the first TFT switch tube and the second TFT switch tube are turned off, the touch layer performs a capacitive sensing operation.

[0009] In some embodiments, there is at least one first routing line between the first routing line and the corresponding first ground line; and there is at least one second routing line between the second routing line and the corresponding second ground line.

[0010] In some embodiments, the number of the first routing lines between the first routing lines and the corresponding first ground lines is greater than or equal to 2; the number of the second routing lines between the second routing lines and the corresponding second ground lines is greater than or equal to 2.

[0011] In some embodiments, the number of the first routing lines between the first routing lines and the corresponding first ground lines is 2 to 8; the number of the second routing lines between the second routing lines and the corresponding second ground lines is 2 to 8.

[0012] In some embodiments, the first ground line satisfies the following relationship: 1 / 3≤d1 / D1≤2 / 3, where d1 is the distance between the first ground line and the adjacent first routing line, and D1 is the distance between two adjacent first routing lines; the second ground line satisfies the following relationship: 1 / 3≤d2 / D2≤2 / 3, where d2 is the distance between the second ground line and the adjacent second routing line, and D2 is the distance between two adjacent second routing lines.

[0013] In some embodiments, the first ground line is located in the middle of two adjacent first routing lines, and the second ground line is located in the middle of two adjacent second routing lines.

[0014] In some embodiments, the OLED touch display panel further includes: a plurality of first connecting lines arranged along the second direction, the first connecting lines being used to connect the first routing line and the first ground line, the first TFT switch tube being located on the first connecting line, and the plurality of first connecting lines being located on the same side of all the second routing lines; a plurality of second connecting lines arranged along the first direction, the second connecting lines being used to connect the second routing line and the second ground line, the second TFT switch tube being located on the second connecting line, and the plurality of second connecting lines being located on the same side of all the first routing lines.

[0015] In some embodiments, the touch layer further includes a reference ground plane, and the first ground line and the second ground line are both electrically connected to the reference ground plane.

[0016] In some embodiments, the OLED display layer includes: an anode layer, a light-emitting layer, and a cathode layer sequentially arranged on the TFT substrate, wherein the cathode layer is grounded; the first ground line is electrically connected to the cathode layer via a first conductive via, and the second ground line is electrically connected to the cathode layer via a second conductive via.

[0017] In some embodiments, the OLED touch display panel further includes: a plurality of third conductive vias, wherein the first routing line is electrically connected to one end of the first TFT switch tube via the corresponding third conductive vias, and the first ground line is electrically connected to the other end of the first TFT switch tube via the corresponding third conductive vias; a plurality of fourth conductive vias, wherein the second routing line is electrically connected to one end of the second TFT switch tube via the corresponding fourth conductive vias, and the second ground line is electrically connected to the other end of the second TFT switch tube via the corresponding fourth conductive vias; wherein the third conductive vias are all located on the same outside of all the second routing lines, and the fourth conductive vias are all located on the same outside of all the first routing lines.

[0018] The technical solution provided by the embodiments of the present disclosure has at least the following advantages:

[0019] The technical solution for an OLED touch display panel provided in an embodiment of the present disclosure includes: a TFT substrate, an OLED display layer, and a touch layer. The TFT substrate includes a drive circuit; the display layer is located on the TFT substrate, and the drive circuit is used to drive the OLED display layer to emit light; and the touch layer is located on a surface of the OLED display layer facing away from the TFT substrate. The touch layer includes: a plurality of first traces spaced apart along a first direction and a plurality of second traces spaced apart along a second direction. The first traces extend along the second direction, which is different from the first direction, and the second traces extend along the first direction. The second traces are insulated and arranged in a cross-section with the first traces. The touch layer also includes: a plurality of first ground lines spaced apart along the first direction and a plurality of second ground lines spaced apart along the second direction. The first ground lines are located between adjacent first traces, corresponding one-to-one with the first traces, and electrically connected to the corresponding first traces via first TFT switches. The second ground lines are located between adjacent second traces, corresponding one-to-one with the second traces, and electrically connected to the corresponding second traces via second TFT switches. The first TFT switch and the second TFT switch are both located within the TFT substrate; and a controller is configured to provide a control signal, causing the first TFT switch and the second TFT switch to be turned on or off in response to the control signal. During the on-state period, the touch layer performs an electromagnetic induction operation, and during the off-state period, the touch layer performs a capacitive sensing operation. In the OLED touch display panel provided in the embodiment of the present disclosure, the first TFT switch and the second TFT switch can be used to cause the touch layer to perform a corresponding electromagnetic induction operation or a capacitive sensing operation. That is, the OLED touch display panel provided in the embodiment of the present disclosure is compatible with either electromagnetic induction or capacitive sensing functions. Users can use an electromagnetic pen to touch the OLED touch display panel, achieving high precision. Users can also use their fingers to touch the OLED touch display panel, achieving high convenience. Therefore, compared to OLED touch display panels that only support capacitive sensing or electromagnetic induction functions, the OLED touch display panel provided in the embodiment of the present disclosure is compatible with either electromagnetic induction or capacitive sensing functions, thereby improving the practicality of the OLED touch display panel.In addition, in the OLED touch display panel provided by the embodiment of the present disclosure, the first TFT switch tube is connected to the corresponding first ground line and the first routing line, and the second TFT switch tube is connected to the corresponding second ground line and the second routing line. The first TFT switch tube and the second TFT switch tube are compatible with the electromagnetic induction function or the capacitive sensing function. Compared with the OLED touch display panel in the related art that achieves compatibility with the capacitive sensing function and the electromagnetic induction function by adding a capacitive sensing layer or an electromagnetic sensing layer, the first ground line, the first routing line, the second ground line and the second routing line in the OLED touch display panel in the embodiment of the present disclosure are all located in the touch layer, which is conducive to the lightweight design of the OLED touch display panel. In addition, the process for preparing TFT switch tubes in the TFT substrate is relatively mature. The first TFT switch tube and the second TFT switch tube are arranged in the TFT substrate without additionally increasing the process cost of the OLED touch display panel. It can be understood that in the embodiment of the present disclosure, the first TFT switch tube and the second TFT switch tube are manufactured using the manufacturing process of the drive circuit in the TFT substrate, which does not incur additional costs. Therefore, when both capacitive sensing and electromagnetic induction requirements are met, no additional process changes or cost increases are caused.

[0020] According to some embodiments of the present disclosure, another aspect of the present disclosure further provides an electronic device, comprising the OLED touch display panel described in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] FIG1 is a schematic structural diagram of an OLED touch display panel that only supports capacitive touch function in the related art;

[0023] FIG2 is a schematic diagram of a circuit structure inside the touch layer in FIG1 ;

[0024] FIG3 is a schematic structural diagram of an OLED touch display panel supporting only electromagnetic touch function in the related art;

[0025] FIG4 is a schematic diagram of a circuit structure inside the touch layer in FIG3 ;

[0026] FIG5 is a schematic diagram of an internal structure of an OLED touch display panel provided by an embodiment of the present disclosure;

[0027] FIG6 is a schematic diagram of a circuit structure of an OLED touch display panel provided by an embodiment of the present disclosure;

[0028] FIG7 is a schematic diagram of a partial structure of an OLED touch display panel provided by an embodiment of the present disclosure;

[0029] FIG8 is another partial structural diagram of an OLED touch display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] FIG1 is a schematic diagram of a structure of an OLED touch display panel that only supports a capacitive touch function in the related art, and FIG2 is a schematic diagram of a circuit structure inside the touch layer in FIG1 .

[0031] 1 and 2 , an OLED touch display panel in related art includes a TFT (Thin Film Transistor) substrate 100, an OLED display layer 101, and a touch layer 102. The TFT substrate 100 includes a driving circuit. The OLED display layer 101 is located on the TFT substrate 100. The driving circuit is used to drive the OLED display layer 101 to emit light. The touch layer 102 is located on the surface of the OLED display layer 101 facing away from the TFT substrate 100. Among them, the touch layer 102 includes: a plurality of horizontal electrodes Xn (n = 0, 1, 2, etc. natural numbers) arranged at intervals along a first direction, the horizontal electrodes Xn extending along a second direction, and the second direction is different from the first direction; a plurality of vertical electrodes Yn (n = 0, 1, 2, etc. natural numbers) arranged at intervals along the second direction, the vertical electrodes Yn extending along the first direction, and the vertical electrodes Yn and the horizontal electrodes Xn are insulated and cross-arranged. The OLED touch display panel also includes a controller (not shown), which is connected to the horizontal electrodes Xn and the vertical electrodes Yn. The controller is used to detect the capacitance value between the horizontal electrodes Xn and the vertical electrodes Yn and calculate the coordinates of the touch position.

[0032] The TFT substrate 100 provides support for other components of the OLED touch display panel and provides a driving circuit that can drive the OLED display layer to emit light.

[0033] The OLED display layer 101 is used to emit light when driven by a driving circuit in the TFT substrate 100 .

[0034] The horizontal electrode Xn is used to form a capacitor structure with the corresponding vertical electrode Yn. When the user uses a finger or a capacitive pen to touch the OLED touch display panel, the capacitance of the capacitor structure formed by the horizontal electrode Xn and the vertical electrode Yn near the touch position will change. The controller can calculate the coordinates of the touch position based on the capacitance value detected between the horizontal electrode Xn and the vertical electrode Yn. However, the capacitance value between the horizontal electrode Xn and the vertical electrode Yn is easily affected by the external environment, which makes the OLED touch display panel less accurate in identifying the touch position.

[0035] FIG3 is a schematic diagram of a structure of an OLED touch display panel that only supports electromagnetic touch function in the related art, and FIG4 is a schematic diagram of a circuit structure inside the touch layer in FIG3 .

[0036] Referring to Figures 3 and 4 simultaneously, an OLED touch display panel in the related art includes: a TFT substrate 200, an OLED display layer 201, and a touch layer 202. The TFT substrate 200 includes a driving circuit. The OLED display layer 201 is located on the TFT substrate 200. The driving circuit is used to drive the OLED display layer 201 to emit light. The touch layer 202 is located on a surface of the OLED display layer 201 facing away from the TFT substrate 200. The touch layer 202 includes: a plurality of transverse coils An (n = 1, 2, 3, or other positive integers) spaced apart along a first direction, with a second direction different from the first direction; and a plurality of longitudinal coils Bn (n = 1, 2, 3, or other positive integers) spaced apart along a second direction. The longitudinal coils Bn are insulated and arranged in a cross-section with the transverse coils An. The OLED touch display panel also includes a controller 203, which is connected to the transverse coils An and the longitudinal coils Bn. The controller 203 is used to detect the magnetic flux distribution on the transverse coils An and the longitudinal coils Bn and calculate the coordinates of the touch position.

[0037] The transverse coil An is used to generate a magnetic field, and the longitudinal coil Bn is used to generate a magnetic field. When a user touches the OLED touch display panel with an electromagnetic pen, the electromagnetic pen sends an electromagnetic signal, changing the magnetic flux of the adjacent transverse coil An and longitudinal coil Bn. The controller 203 can calculate the coordinates of the touch position based on the magnetic flux distribution detected on the transverse coil An and longitudinal coil Bn. During this process, the magnetic flux distribution on the transverse coil An and longitudinal coil Bn is only affected by the electromagnetic pen, with little interference from the external environment. This results in a low accuracy of the OLED touch display panel in identifying the touch position. However, this OLED touch display panel cannot support finger touch, making it less practical.

[0038] In summary, the OLED touch display panel that only supports capacitive touch function in the related art can support user finger touch operation, but the accuracy is low. The OLED touch display panel that only supports electromagnetic touch function in the related art has high accuracy, but cannot support finger operation. Therefore, the practicality of the OLED touch display panel in the related art needs to be improved. In general, for the currently common OLED screen structure (i.e., OLED touch display panel), the touch layer and the display layer are close. When the display layer is working, the touch faces great display interference, especially for the active capacitive pen solution, which cannot achieve high-precision writing; for the electromagnetic pen solution, the electromagnetic pen solution has better anti-interference characteristics, but the traditional electromagnetic pen solution has the following problems: First, it is necessary to add an electromagnetic layer to the screen, which will increase the complexity and thickness of the screen; the cost will also increase; second, an additional receiving channel is required; the number of pins on the screen is doubled, and an additional integrated circuit is required to process the electromagnetic signal. This will result in the need to reserve a large routing space and bring a significant increase in cost.

[0039] Based on the above problems, the embodiment of the present disclosure provides an OLED touch display panel, comprising: a TFT substrate, an OLED display layer, and a touch layer. The touch layer comprises: a plurality of first traces arranged at intervals along a first direction and a plurality of second traces arranged at intervals along a second direction, the first traces extending along the second direction, the second traces extending along the first direction, the second direction being different from the first direction, and the second traces and the first traces being insulated and cross-arranged. The touch layer also comprises: a plurality of first ground lines arranged at intervals along the first direction and a plurality of second ground lines arranged at intervals along the second direction, the first ground lines being located between adjacent first traces, the first ground lines corresponding one-to-one to the first traces, and the first ground lines being electrically connected to the corresponding first traces via a first TFT switch tube, the second ground lines being located between adjacent second traces, the second ground lines corresponding one-to-one to the second traces, and the second ground lines being connected to the corresponding second traces via a second TFT switch. Wherein, the first TFT switch tube and the second TFT switch tube are both located in the TFT substrate. The touch layer also includes: a controller, which is used to provide a control signal, and the first TFT switch tube and the second TFT switch tube are turned on or off in response to the control signal. When the first TFT switch tube and the second TFT switch tube are turned on, the touch layer performs an electromagnetic induction operation, and when the first TFT switch tube and the second TFT switch tube are turned off, the touch layer performs a capacitive sensing operation.

[0040] In the OLED touch display panel provided in the embodiment of the present disclosure, the touch layer can perform corresponding electromagnetic induction operations or capacitive induction operations through the first TFT switch tube and the second TFT switch tube, so that the user can use an electromagnetic pen to touch the OLED touch display panel with high precision, and can also support the user to use a finger to touch the OLED touch display panel with high convenience. Therefore, compared with OLED touch display panels that only support capacitive sensing functions or only support electromagnetic sensing functions, the OLED touch display panel provided by the embodiment of the present disclosure is compatible with electromagnetic induction functions and capacitive sensing functions, which can improve the practicality of the OLED touch display panel. In addition, compared with the OLED touch display panels in the related art that achieve compatibility with capacitive sensing functions and electromagnetic sensing functions by adding a capacitive sensing layer or an electromagnetic sensing layer, the first ground line, the first routing line, the second ground line, and the second routing line in the OLED touch display panel in the embodiment of the present disclosure are all located in the touch layer, which is conducive to the lightweight design of the OLED touch display panel. In addition, the process of preparing TFT switch tubes in the TFT substrate is relatively mature, and setting the first TFT switch tube and the second TFT switch tube in the TFT substrate does not increase the process cost of the OLED touch display panel.

[0041] It can be understood that the OLED touch display panel provided in the embodiment of the present disclosure does not increase the number of routing pins (i.e., pins) connected to the controller without increasing the process complexity of the OLED touch display panel. Correspondingly, the complexity of the connecting wires required to connect to the controller and the controller are not increased, which can avoid the problem of increased costs caused by the increased complexity of the connecting wires and the controller.

[0042] The following describes various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in the various embodiments of the present disclosure to facilitate a better understanding of the present disclosure. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the present disclosure can still be implemented.

[0043] FIG5 is a schematic diagram of an internal structure of an OLED touch display panel provided in an embodiment of the present disclosure, and FIG6 is a schematic diagram of a circuit structure of an OLED touch display panel provided in an embodiment of the present disclosure.

[0044] 5 and 6 , the OLED touch display panel includes: a TFT substrate 300 having a driving circuit therein; an OLED display layer 301 located on the TFT substrate 300, the driving circuit being configured to drive the OLED display layer 301 to emit light; a touch layer 302 located on a surface of the OLED display layer 301 facing away from the TFT substrate 300; wherein the touch layer 302 includes: a plurality of first traces 312 arranged at intervals along a first direction X, the first traces 312 extending along a second direction Y, the second direction Y being different from the first direction X; a plurality of second traces 322 arranged at intervals along the second direction Y, the second traces 322 extending along the first direction X, the second traces 322 being insulated and cross-connected with the first traces 312; and a plurality of first ground traces 332 arranged at intervals along the first direction X, the first ground traces 332 being located between adjacent first traces 312, the first ground traces 332 corresponding one-to-one to the first traces 312, and The first ground line 332 is electrically connected to the corresponding first routing line 312 via the first TFT switch 310. A plurality of second ground lines 342 are arranged at intervals along the second direction Y. The second ground lines 342 are located between adjacent second routing lines 322. The second ground lines 342 correspond one-to-one with the second routing lines 322, and the second ground lines 342 are connected to the corresponding second routing lines 322 via the second TFT switch 320. The first TFT switch 310 and the second TFT switch 320 are both located within the TFT substrate 300. A controller 303 is provided for providing a control signal. The first TFT switch 310 and the second TFT switch 320 are turned on or off in response to the control signal. When the first TFT switch 310 and the second TFT switch 320 are turned on, the touch layer 302 performs an electromagnetic induction operation. When the first TFT switch 310 and the second TFT switch 320 are turned off, the touch layer 302 performs a capacitive sensing operation.

[0045] The OLED touch display panel can also be an AMOLED (Active Matrix / Organic Light Emitting Diode) touch display panel. The TFT substrate 300 provides support for other components of the OLED touch display panel and has a driving circuit inside the TFT substrate 300 that can drive the OLED display layer 301 to emit light.

[0046] The OLED display layer 301 is used to emit light under the drive of the driving circuit in the TFT substrate 300 .

[0047] The touch layer 302 is used to sense user touch operations.

[0048] The first trace 312 extends along the second direction Y, and the second trace 322 extends along the first direction X. The extension direction of the first trace 312 is different from the extension direction of the second trace 322. When the controller 303 controls the first TFT switch tube 310 and the second TFT switch tube 320 to be turned off, the first trace 312 is used to form a capacitor structure with the corresponding second trace 322, and the touch layer 302 performs a capacitive sensing operation. At this time, when a user touches the OLED touch display panel with a finger or a capacitive stylus, the capacitance of the capacitor structure formed by the first trace 312 and the second trace 322 near the touch location will change. The controller 303 can detect the capacitance value between the first trace 312 and the second trace 322 and calculate the coordinates of the touch location.

[0049] In some embodiments, the first direction X may be perpendicular to the second direction Y. In some embodiments, the first direction and the second direction may not be perpendicular. The first ground line 332 corresponds one-to-one with the first routing line 312, and the first ground line 332 is used to form an inductor coil with the first routing line 312. The second ground line 342 corresponds one-to-one with the second routing line 322, and the second ground line 342 is used to form an inductor coil with the second routing line 322. The first ground line 332 is electrically connected to the corresponding first routing line 312 via the first TFT switch tube 310, and the second ground line 342 is connected to the corresponding second routing line 322 via the second TFT switch tube 320. When the controller 303 controls the first TFT switch When the tube 310 and the second TFT switch tube 320 are turned on, the touch layer 302 performs an electromagnetic induction operation. At this time, when the user uses an electromagnetic pen to touch the OLED touch display panel, the electromagnetic pen will send an electromagnetic signal to change the magnetic flux on the adjacent first trace 312, the first ground line 332, the second trace 322 and the second ground line 342. The controller 303 can detect the magnetic flux distribution on the horizontal first trace 312, the first ground line 332, the second trace 322 and the second ground line 342 and calculate the coordinates of the touch position.

[0050] The material of the first trace 312 can be the same as that of the corresponding first ground line 332, and the material of the second trace 322 can be the same as that of the corresponding second ground line 342. In this way, the first trace 213 and the first ground line 332 can be routed using the same routing process, and the second trace 322 and the second ground line 342 can be routed using the same routing process.

[0051] It is understood that in other embodiments, the material of the first trace 312 may be different from the material of the first ground line 332. For example, the resistivity of the material of the first trace 312 is greater than the resistivity of the material of the first ground line 332. Similarly, the material of the second trace 322 may be different from the material of the second ground line 342. For example, the resistivity of the material of the second trace 322 is greater than the resistivity of the material of the second ground line 342.

[0052] Specifically, based on the magnetic flux of the coil formed by the first routing line 312 and the first ground wire 332 and the adjacent coils in the same direction, the horizontal coordinates of the electromagnetic pen can be calculated according to the center of mass algorithm; similarly, based on the magnetic flux of the coil formed on the second routing line 322 and the second ground wire 342 and the adjacent coils in the same direction, the vertical coordinates of the electromagnetic pen can be calculated; based on the horizontal and vertical coordinate information, the position of the pen tip is obtained to achieve high-precision writing.

[0053] In some embodiments, there is at least one first routing line 312 between the first routing line 312 and the corresponding first ground line 332. Such a setting can ensure that when the touch layer 302 is under electromagnetic induction operation, when the user uses an electromagnetic pen to touch the touch layer 302, the magnetic flux of the electromagnetic coil formed on the first routing line 312 near the touch position and the corresponding first ground line 332 can change. The controller 303 can locate the coordinates of the touch position according to the changed magnetic flux, which is beneficial to improving the reliability of the OLED touch display panel and realizing reliable coordinate positioning of the electromagnetic pen in the corresponding extension direction of the first routing line 312. There is at least one second routing line 322 between the second routing line 322 and the corresponding second ground line 342. This arrangement can ensure that when the touch layer 302 is under electromagnetic induction operation, when the user uses an electromagnetic pen to touch the touch layer 302, the magnetic flux of the electromagnetic coil formed on the second routing line 322 near the touch position and the corresponding second ground line 342 can change. The controller 303 can locate the coordinates of the touch position according to the changed magnetic flux, which is beneficial to improving the reliability of the OLED touch display panel and realizing reliable coordinate positioning of the electromagnetic pen in the corresponding extension direction of the second routing line 322.

[0054] The number of first traces 312 located between the first traces 312 and the corresponding first ground traces 332 may be greater than or equal to 2. The number of second traces 322 located between the second traces 322 and the corresponding second ground traces 342 may be greater than or equal to 2.

[0055] In some embodiments, the number of first traces 312 located between the first trace 312 and the corresponding first ground trace 332 can be 2 to 8, for example, 2, 3, 4, or 5. This range of numbers can avoid situations where the electromagnetic coil formed by the first trace 312 and the first ground trace 332 has a large span, which could easily interfere with the precision of the electromagnetic coil formed by the first trace 312 and the first ground trace 332 due to a large number of traces, thereby improving the reliability of the OLED touch display panel. This range of numbers can also ensure that when a user touches the touch layer 302 with an electromagnetic stylus under electromagnetic induction operation, the magnetic flux of the electromagnetic coil formed by the first trace 312 and the corresponding first ground trace 332 near the touch location can be changed, thereby improving the reliability of the OLED touch display panel.

[0056] In addition, in some specific examples, the number of first traces 312 located between the first trace 312 and the corresponding first ground line 332 may also be 3 to 5. The number of first traces 312 located between the first trace 312 and the corresponding first ground line 332 is within the above range, that is, the span range of the electromagnetic coil formed by the first trace 312 and the first ground line 332 is more reasonable, so that the electromagnetic induction effect is better. Specifically, when the electromagnetic pen is close to the screen (i.e., the OLED touch display panel), it will generally affect the signals of several adjacent electromagnetic coils at the same time. When the spans of different electromagnetic coils are too large, the signals received by the several electromagnetic coils near the electromagnetic pen will be relatively close, and the low degree of distinction is not conducive to locating the coordinates through the centroid algorithm; if the number of first traces 312 located between the first trace 312 and the corresponding first ground line 332 is too small, and the number of electromagnetic coils that receive the electromagnetic signal is too small, it is also not conducive to the centroid algorithm to obtain the coordinates, affecting the positioning accuracy.

[0057] It should also be noted that the spacing between two adjacent first traces 312 is between 3 mm and 8 mm, for example, 4 mm, 5 mm, 7 mm, etc. If the spacing is too large, positioning accuracy will be affected. If the spacing is too small, more traces and pins will be required for the same screen size, which will increase wiring difficulty and integrated circuit cost. It is understood that in some specific embodiments, the number of first traces 312 located between the first trace 312 and the corresponding first ground line 332 can also be 3 to 5, and the spacing between two adjacent first traces 312 is between 3 mm and 8 mm, which can achieve a good electromagnetic induction effect without increasing wiring difficulty and cost.

[0058] The number of second traces 322 located between the second traces 322 and the corresponding second ground traces 342 can be 2 to 8, for example, 2, 3, 4, or 5. Within this range, the electromagnetic coil formed by the second traces 322 and the second ground traces 342 can be prevented from having an excessively large number of traces, which could interfere with the precision of the electromagnetic coil formed by the second traces 322 and the second ground traces 342. This can improve the reliability of the OLED touch display panel. Furthermore, this range ensures that when a user touches the touch layer 302 with an electromagnetic stylus under electromagnetic induction operation, the magnetic flux of the electromagnetic coil formed by the second traces 322 and the corresponding second ground traces 342 near the touch location can be altered, thereby improving the reliability of the OLED touch display panel.

[0059] In addition, in some specific examples, the number of first traces 312 located between the second trace 322 and the corresponding second ground line 342 can also be 3 to 5. The number of second traces 322 located between the second trace 322 and the corresponding second ground line 342 is within the above range, that is, the span range of the electromagnetic coil formed by the second trace 322 and the second ground line 342 is more reasonable, so that the electromagnetic induction effect is better. Specifically, when the electromagnetic pen is close to the screen (i.e., the OLED touch display panel), it will generally affect the signals of several adjacent electromagnetic coils at the same time. When the spans of different electromagnetic coils are too large, the signals received by the several electromagnetic coils near the electromagnetic pen will be relatively close, and the low degree of distinction is not conducive to locating coordinates through the centroid algorithm; if the number of second traces 322 located between the second trace 322 and the corresponding second ground line 342 is too small, and the number of electromagnetic coils that receive electromagnetic signals is too small, it is also not conducive to the centroid algorithm to obtain coordinates, affecting the positioning accuracy.

[0060] It should also be noted that the spacing between two adjacent second traces 322 is between 3 mm and 8 mm, for example, 4 mm, 5 mm, 7 mm, etc. If the spacing is too large, positioning accuracy will be affected. If the spacing is too small, more traces and pins will be required for the same screen size, which will increase wiring difficulty and integrated circuit cost. It is understood that in some specific embodiments, the number of second traces 322 located between the second trace 322 and the corresponding second ground line 342 can also be 3 to 5, and the spacing between two adjacent second traces 322 is between 3 mm and 8 mm, which can achieve a good electromagnetic induction effect without increasing wiring difficulty and cost.

[0061] In some embodiments, the first ground line 332 satisfies the following relationship: 1 / 3 ≤ d1 / D1 ≤ 2 / 3, where d1 is the distance between the first ground line 332 and an adjacent first trace 312, and D1 is the distance between two adjacent first traces 312. Positioning the first ground line 332 between two adjacent first traces 312 within this range minimizes interference between the first ground line 332 and the adjacent first trace 312, thereby improving the reliability of the OLED touch display panel. The second ground line 342 satisfies the following relationship: 1 / 3 ≤ d2 / D2 ≤ 2 / 3, where d2 is the distance between the second ground line 342 and an adjacent second trace 322, and D2 is the distance between two adjacent second traces 322. Positioning the second ground line 342 between two adjacent second traces 322 within this range minimizes interference between the second ground line 342 and the adjacent second trace 322, thereby improving the touch accuracy of the OLED touch display panel.

[0062] In some embodiments, the first ground line 332 is located directly between two adjacent first traces 312. In this case, the first ground line 332 interferes with the two adjacent first traces 312 to the same or similar degree, and the interference of the first ground line 332 on the first traces 312 can be offset, thereby improving the reliability of the OLED touch display panel. The second ground line 342 is located directly between two adjacent second traces 322. In this case, the second ground line 342 interferes with the two adjacent second traces 322 to the same or similar degree, and the interference of the second ground line 342 on the second traces 322 can be offset, thereby improving the touch accuracy of the OLED touch display panel.

[0063] In some examples, the width of the first ground line 332 can be greater than or equal to the width of the first trace 312, thereby further reducing the interference caused by the first ground line 332. Similarly, the width of the second ground line 342 can be greater than or equal to the width of the second trace 322, thereby further reducing the interference caused by the second ground line 342.

[0064] In some embodiments, the OLED touch display panel further includes: a plurality of first connection lines 352 arranged along the second direction Y, the first connection lines 352 being used to connect the first routing line 312 and the first ground line 332, the first TFT switch tube 310 being located on the first connection line 352, and the plurality of first connection lines 352 being located on the same side of all the second routing lines 322; and a plurality of second connection lines 362 arranged along the first direction X, the second connection lines 362 being used to connect the second routing line 322 and the second ground line 342, the second TFT switch tube 320 being located on the connection lines, and the plurality of second connection lines 362 being located on the same side of all the first routing lines 312.

[0065] It can be understood that the touch layer 302 can be divided into a display area and a non-display area, the display area is used for user touch operation, and the non-display area is used to provide space for sealing and connecting other components in the OLED touch display panel. The first connecting line 352 is used to connect the first wiring 312 and the first ground line 332. The multiple first connecting lines 352 are located on the same side of all the second wirings 322, and the first TFT switch tube 310 is located on the first connecting line 352, so that the first TFT switch tube 310 does not occupy the position of the first wiring 312 and the first ground line 332. The first wiring 312 and the first ground line 332 are located in the display area, so that the first TFT switch tube 310 can not Occupying the position of the display area of ​​the touch layer 302 is beneficial to improving the screen-to-body ratio of the OLED touch display panel. The second connecting line 362 is used to connect the second routing line 322 and the second ground line 342. Multiple second connecting lines 362 are located on the same side of all the first routing lines 312, and the second TFT switch tube 320 is located on the second connecting line 362, so that the second TFT switch tube 320 does not occupy the position of the second routing line 322 and the second ground line 342. The second routing line 322 and the second ground line 342 are located in the display area, so that the second TFT switch tube 320 does not occupy the position of the display area of ​​the touch layer 302, which is beneficial to improving the screen-to-body ratio of the OLED touch display panel.

[0066] It can be understood that in some examples, the first connecting line 352 may not be set to connect the first routing line 312 and the first ground line 332. The first routing line 312 and the first ground line 332 can be directly connected, and the multiple first TFT switch tubes 310 are set on the same side of all the second routing lines 322. The second connecting line 362 may not be set to connect the second routing line 322 and the second ground line 342. The second routing line 322 and the second ground line 342 can be directly connected, and the multiple second TFT switch tubes 320 are set on the same side of all the first routing lines 312.

[0067] In some embodiments, the touch layer 302 further includes a reference ground plane (not shown), to which the first ground line 332 and the second ground line 342 are electrically connected. This configuration eliminates the need for the first ground line 332 and the second ground line 342 to be connected to the ground plane in the controller 303, thereby reducing the number of pins in the controller 303 and thereby reducing the cost of the OLED touch display panel. Furthermore, this configuration simplifies the wiring within the OLED touch display panel, thereby increasing the screen-to-body ratio of the OLED touch display panel.

[0068] In some embodiments, the OLED display layer 301 includes: an anode layer 311, a light-emitting layer 321, and a cathode layer 313 sequentially arranged on the TFT substrate 300, wherein the cathode layer 313 is grounded; a first ground line 332 is electrically connected to the cathode layer 313 via a first conductive via (not shown), and a second ground line 342 is electrically connected to the cathode layer 313 via a second conductive via (not shown).

[0069] The anode layer 311 and the cathode layer 313 are used to connect to the driving circuit in the TFT substrate 300. When a positive voltage is applied to the driving circuit, electrons and holes are injected from the negative electrode and the positive electrode into the light-emitting layer 321 respectively under the action of the external electric field. Subsequently, the electrons and holes migrate in the light-emitting layer 321 and then recombine to form excitons. The excitons then transfer energy to the light-emitting molecules in the light-emitting layer 321, thereby exciting the electrons from the ground state to the excited state. Finally, the excited state energy is de-excited to generate photons, causing the light-emitting layer 321 to emit light. Among them, the cathode layer 313 is connected to the reference ground, the first ground wire 332 is electrically connected to the cathode layer 313 via a first conductive via, and the second ground wire 342 is electrically connected to the cathode layer 313 via a second conductive via. This not only saves the connection pins of the controller 303 and simplifies the wiring within the OLED touch display panel, improves the screen-to-body ratio of the OLED touch display panel and reduces the cost of the OLED touch display panel, but also does not require setting an additional reference ground plane. The existing cathode layer 313 can be directly used to complete the grounding connection setting of the first ground wire 332 and the second ground wire 342, which can further reduce the cost of the OLED touch display panel.

[0070] In some embodiments, the TFT substrate 300 may include a base 330 and a third TFT switch 340. The third TFT switch 340 is located on the base 330 and is connected to the anode layer 311 to drive the light-emitting layer 321 to emit light. When the third TFT switch 340 is turned on, a forward voltage is applied to the anode layer 311, causing the light-emitting layer 321 to emit light. When the third TFT switch 340 is turned off, no voltage is applied to the anode layer 311, causing the light-emitting layer 321 to not emit light. The OLED display layer 301 may also include a conductive plug 314, an interlayer dielectric layer 315, and a pixel definition layer (PDL) 316. Conductive plug 314 is used to electrically connect the third TFT switch tube 340 to the anode layer 311. Interlayer dielectric layer 315 is located between anode layer 311 and third TFT switch tube 340 and is used to electrically insulate the third TFT switch tube 340 from other layers, such as pixel definition layer 316. Pixel definition layer 316 is used to divide the pixel light-emitting units in light-emitting layer 321 and reduce color mixing between adjacent pixel light-emitting units. The OLED touch display panel may also include a buffer layer 304 and a transparent cover plate 305. The buffer layer 304 is located between cathode layer 313 and transparent cover plate 305 to buffer and protect cathode layer 313. The transparent cover plate 305 is used to protect other components of the OLED touch display panel.

[0071] It can be understood that Figure 5 illustrates the situation where the touch layer 302 is located between the transparent cover plate 305 and the buffer layer 304. In fact, the touch layer 302 can also be located inside the transparent cover plate 305. The embodiment of the present disclosure does not limit the positional relationship between the touch layer 302 and the transparent cover plate 305 and the buffer layer 304.

[0072] FIG7 is a schematic diagram of a partial structure of an OLED touch display panel provided in an embodiment of the present disclosure, and FIG8 is a schematic diagram of another partial structure of an OLED touch display panel provided in an embodiment of the present disclosure.

[0073] 6 to 8 , in some embodiments, the OLED touch display panel further includes: a plurality of third conductive vias 306 , wherein the first routing line 312 is electrically connected to one end of the first TFT switch tube 310 via the corresponding third conductive vias 306 , and the first ground line 332 is electrically connected to the other end of the first TFT switch tube 310 via the corresponding third conductive vias 306 ; and a plurality of fourth conductive vias 307 , wherein the second routing line 322 is electrically connected to one end of the second TFT switch tube 320 via the corresponding fourth conductive vias 307 , and the second ground line 342 is electrically connected to the other end of the second TFT switch tube 320 via the corresponding fourth conductive vias 307 ; wherein the third conductive vias 306 are all located on the same outer side of all the second routing lines 322 , and the fourth conductive vias 307 are all located on the same outer side of all the first routing lines 312 .

[0074] The third conductive via 306 is used to connect the first ground line 332, the first routing line 312 and the first TFT switch tube 310. The third conductive via 306 is arranged on the same outer side of all the second routing lines 322, so that the third conductive via 306 does not occupy the position of the first routing line 312 and the first ground line 332. The second routing line 322 is located in the display area of ​​the touch layer 302, so that the third conductive via 306 does not occupy the position of the display area of ​​the touch layer 302, which is beneficial to improving the screen-to-body ratio of the OLED touch display panel.

[0075] The fourth conductive via 307 is used to connect the second ground line 342, the second routing line 322 and the second TFT switch tube 320, and the fourth conductive via 307 is set on the same outer side of all the first routing lines 312, which can prevent the fourth conductive via 307 from occupying the position of the second routing line 322 and the second ground line 342. The first routing line 312 is located in the display area of ​​the touch layer 302, so that the fourth conductive via 307 does not occupy the position of the display area of ​​the touch layer 302, which is beneficial to improving the screen-to-body ratio of the OLED touch display panel.

[0076] In the above-mentioned OLED touch display panel, the first TFT switch transistor 310 and the second TFT switch transistor 320 can enable the touch layer 302 to perform corresponding electromagnetic induction operations or capacitive sensing operations. That is, the OLED touch display panel provided by the embodiment of the present disclosure is compatible with electromagnetic induction functions or capacitive sensing functions, so that users can use electromagnetic pens to touch the OLED touch display panel with high precision. It also supports users to use fingers to touch the OLED touch display panel with high convenience. Therefore, compared with OLED touch display panels that only support capacitive sensing functions or only support electromagnetic sensing functions, the OLED touch display panel provided by the embodiment of the present disclosure is compatible with electromagnetic induction functions or capacitive sensing functions, which can improve the practicality of the OLED touch display panel. In addition, compared with OLED touch display panels in the related art that achieve compatibility with capacitive sensing functions and electromagnetic sensing functions by adding a capacitive sensing layer or an electromagnetic sensing layer, the first ground line 332, the first trace 312, the second ground line 342, and the second trace 322 in the OLED touch display panel of the embodiment of the present disclosure are all located on the touch layer 302, which is conducive to the lightweight and thin design of the OLED touch display panel. In addition, the process of preparing TFT switch tubes in the TFT substrate 300 is relatively mature. Disposing the first TFT switch tube 310 and the second TFT switch tube 320 in the TFT substrate 300 will not increase the process cost of the OLED touch display panel.

[0077] Accordingly, another embodiment of the present disclosure further provides an electronic device having the OLED touch display panel described in any of the above embodiments. For the same or corresponding parts as the previous embodiment, please refer to the corresponding description of the previous embodiment and will not be described in detail below.

[0078] The electronic device may be a mobile phone, computer, electronic paper, monitor, notebook computer, digital photo frame or other product with display and touch functions.

[0079] Those skilled in the art will appreciate that the above-described embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes in form and detail may be made thereto without departing from the spirit and scope of the present disclosure. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the scope defined in the claims.

Claims

1. An OLED touch display panel, comprising: A TFT substrate having a driving circuit therein; An OLED display layer, the OLED display layer being located on the TFT substrate, and the driving circuit being used to drive the OLED display layer to emit light; A touch layer, the touch layer being located on a surface of the OLED display layer facing away from the TFT substrate; wherein the touch layer comprises: a plurality of first routing lines spaced apart along a first direction, wherein the first routing lines extend along a second direction different from the first direction; a plurality of second routing lines spaced apart along the second direction, the second routing lines extending along the first direction, the second routing lines being insulated and cross-arranged with the first routing lines; a plurality of first ground lines arranged at intervals along the first direction, the first ground lines being located between adjacent first routing lines, the first ground lines corresponding to the first routing lines one-to-one, and the first ground lines being electrically connected to the corresponding first routing lines via first TFT switches; a plurality of second ground lines arranged at intervals along the second direction, the second ground lines being located between adjacent second routing lines, the second ground lines corresponding to the second routing lines one-to-one, and the second ground lines being connected to the corresponding second routing lines via second TFT switches; Wherein, the first TFT switch tube and the second TFT switch tube are both located in the TFT substrate; A controller is configured to provide a control signal, and the first TFT switch tube and the second TFT switch tube are turned on or off in response to the control signal, wherein the touch layer performs an electromagnetic induction operation during a period when the first TFT switch tube and the second TFT switch tube are turned off, and the touch layer performs a capacitive sensing operation.

2. The OLED touch display panel according to claim 1, wherein: There is at least one first routing line between the first routing line and the corresponding first ground line; and there is at least one second routing line between the second routing line and the corresponding second ground line.

3. The OLED touch display panel according to claim 2, wherein: The number of the first routing lines located between the first routing lines and the corresponding first ground lines is greater than or equal to 2; the number of the second routing lines located between the second routing lines and the corresponding second ground lines is greater than or equal to 2.

4. The OLED touch display panel according to claim 3, wherein: The number of the first routing lines located between the first routing lines and the corresponding first ground lines is 2 to 8; the number of the second routing lines located between the second routing lines and the corresponding second ground lines is 2 to 8.

5. The OLED touch display panel according to claim 1, wherein: The first ground line satisfies the following relationship: 1 / 3≤d1 / D1≤2 / 3, where d1 is the distance between the first ground line and the adjacent first routing line, and D1 is the distance between two adjacent first routing lines; the second ground line satisfies the following relationship: 1 / 3≤d2 / D2≤2 / 3, where d2 is the distance between the second ground line and the adjacent second routing line, and D2 is the distance between two adjacent second routing lines.

6. The OLED touch display panel according to claim 5, wherein: The first ground line is located in the middle of two adjacent first routing lines, and the second ground line is located in the middle of two adjacent second routing lines.

7. The OLED touch display panel according to claim 1, wherein: The OLED touch display panel further includes: a plurality of first connecting lines arranged along the second direction, the first connecting lines being used to connect the first routing line and the first ground line, the first TFT switch tube being located on the first connecting lines, and the plurality of first connecting lines being located on the same side of all the second routing lines; A plurality of second connection lines are arranged along the first direction, the second connection lines are used to connect the second routing line and the second ground line, the second TFT switch tube is located on the second connection line, and the plurality of second connection lines are located on the same side of all the first routing lines.

8. The OLED touch display panel according to claim 1, wherein: The touch layer further includes: A reference ground plane, to which the first ground line and the second ground line are both electrically connected.

9. The OLED touch display panel according to claim 1, wherein: The OLED display layer includes: an anode layer, a light-emitting layer, and a cathode layer sequentially provided on the TFT substrate, wherein the cathode layer is grounded; The first ground line is electrically connected to the cathode layer via a first conductive via, and the second ground line is electrically connected to the cathode layer via a second conductive via.

10. The OLED touch display panel according to claim 1, wherein: The OLED touch display panel further includes: a plurality of third conductive vias, wherein the first wiring is electrically connected to one end of the first TFT switch tube via corresponding third conductive vias, and the first ground wire is electrically connected to the other end of the first TFT switch tube via corresponding third conductive vias; a plurality of fourth conductive vias, wherein the second wiring is electrically connected to one end of the second TFT switch tube via corresponding fourth conductive vias, and the second ground wire is electrically connected to the other end of the second TFT switch tube via corresponding fourth conductive vias; The third conductive vias are all located on the same outer side of all the second traces, and the fourth conductive vias are all located on the same outer side of all the first traces.

11. An electronic device comprising the OLED touch display panel according to any one of claims 1 to 10.

Images