WO2019056439A1 - Oled touch display panel and control method thereof, and touch display device - Google Patents

Abstract

An OLED touch display panel and a control method thereof, and a touch display device. The touch display panel comprises: touch scanning electrodes (204, 303, 404) and touch sensing electrodes (202, 302, 402), wherein the touch scanning electrodes (204, 303, 404) and the touch sensing electrodes (202, 302, 402) are arranged at intervals through a first passivation layer (203, 403). The touch scanning electrodes (204, 303, 404) are formed with a thin-film transistor layer thereon, and the touch scanning electrodes (204, 303, 404) are connected to scan lines (206, 305, 406). The scan lines (206, 305, 406) are further connected to control ends of display units of the thin-film transistor layer for driving the touch scanning electrodes (204, 303, 404) to scan row-by-row when the scan lines (206, 305, 406) connected to the display units perform a row-by-row scan. In this way, the number of IC channels for touch scanning signals can be reduced, and the complexity of timing for a panel to operate electrical signals can be reduced. Further, the touch noise of the panel can be reduced, and the pixel charging time and touch sensitivity can be increased.

Description

OLED touch display panel, control method thereof, and touch display device

[Technical Field]

The present invention relates to the field of display technologies, and in particular, to an OLED touch display panel, a control method thereof, and a touch display device.

 【Background technique】

Organic Light-Emitting diodes, OLED) display, also known as organic electroluminescent display, is an emerging flat panel display device because of its simple preparation process, low cost, low power consumption, high luminous brightness, wide operating temperature range, light size and responsiveness. The speed is fast, and it is easy to realize the advantages of color display and large screen display, and has broad application prospects.

The existing OLEDs include bottom emission type displays and top emission type displays. Currently, the mass-produced bottom-emitting OLED displays are mostly large-sized panels. When superimposed touch technology is required, full-fit or On-cell touch is often used. technology. These two technologies have problems such as large signal noise, low touch sensitivity, and low final module yield, which ultimately leads to high product cost and poor user touch experience.

In order to reduce signal noise and improve touch sensitivity, In-cell technology is proposed, but the traditional In-cell technology needs to separately provide touch scan signals and stagger the gate scan time, as shown in Figure 1, Figure 1 is a prior art display. The touch timing diagram of the first embodiment of the panel is configured to separate the timing 104 of the touch scan signal from the timing 101 of the first row of scan lines, the timing 102 of the second row of scan lines, and the timing 103 of the third row of scan lines. Providing the touch scan signal and staggering the gate scan time not only reduces the pixel charging time, increases the complexity of the signal timing, but also requires more IC channels for the touch scan signal.

 [Summary of the Invention]

The technical problem to be solved by the present invention is to provide an OLED touch display panel, a control method thereof, and a touch display device, which can reduce the number of IC channels of the touch scan signal and reduce the complexity of the timing of the operation of the panel. Reduce the touch noise of the panel and increase the pixel charging time and touch sensitivity.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide an OLED touch display panel, the touch display panel includes: a touch scan electrode and a touch sensing electrode, wherein the touch The control scan electrode and the touch sensing electrode are disposed through a first passivation layer; a thin film transistor layer is further formed on the touch scan electrode, and the touch scan electrode is connected to the scan line; The control terminals of the display unit of the thin film transistor layer are connected to drive the touch scan electrodes to scan line by line when the scan lines connected to the display unit are scanned line by line.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide an OLED touch display device, the OLED touch display device includes an OLED touch display panel, and the OLED touch display panel includes a touch scan electrode and a touch sensing electrode, wherein the touch scan electrode and the touch sensing electrode are spaced apart by a first passivation layer; and the thin film transistor layer is further formed on the touch scan electrode. The touch scan electrode is connected to the scan line; the scan line is further connected to the control end of the display unit of the thin film transistor layer, and the touch scan is driven when the scan line connected to the display unit scans line by line The electrodes are scanned progressively.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a control method for an OLED touch display panel, wherein the OLED touch display panel includes a touch scan electrode and a touch sensor. An electrode, wherein the touch scan electrode and the touch sensing electrode are disposed through a first passivation layer; the touch scan electrode is connected to a scan line; and the scan line is further connected to a display unit of the thin film transistor layer The control terminal is connected, and the control method includes:

Detecting whether the voltage across the touch scan electrode is changed when the scan line connected to the display unit scans line by line to drive the touch scan electrode to scan line by line;

Determining a position of the touch sensing electrode corresponding to the touch scan electrode if the voltage across the touch scan electrode is changed;

Obtaining a display icon corresponding to the position of the touch sensing electrode, and responding to the instruction corresponding to the display icon.

The invention has the beneficial effects that the touch scan electrode layer is overlapped with the scan line, and the scan excitation signal and the trace which serve as the touch scan electrode at the same time by using the scan signal and the trace are not only increased. The pixel charging time reduces the complexity of the timing of the operation of the panel, and also reduces the number of IC channels of the touch scan signal.

 [Description of the Drawings]

1 is a schematic diagram of touch timing of an embodiment of a display panel of the prior art;

2 is a cross-sectional view showing an embodiment of an OLED touch display panel of the present invention;

3 is a cross-sectional view showing another embodiment of the OLED touch display panel of the present invention;

4 is a top plan view of an embodiment of an OLED touch display panel according to the present invention;

FIG. 5 is a schematic diagram of touch timing of an embodiment of an OLED touch display panel according to the present invention; FIG.

FIG. 6 is a schematic flow chart of an embodiment of a method for controlling a touch display panel of an OLED of the present invention.

【Detailed ways】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

For convenience of description, the subsequent OLED touch display panel is simply referred to as an OLED touch display panel.

The OLED touch display panel of the present embodiment includes a touch scan electrode and a touch sensing electrode, wherein the touch scan electrode and the touch sensing electrode are spaced apart by the first passivation layer; and the thin film transistor is further formed on the touch scan electrode. The layer is connected to the scan line by the touch scan electrode; the scan line is also connected to the control end of the display unit of the thin film transistor layer. The touch scan electrode can be an ITO touch scan electrode, and the touch sensing electrode can be an ITO touch sensing electrode, that is, at least one ITO film layer is formed on the touch sensing electrode and the touch scan electrode. The ITO layer includes a material such as indium tin oxide, which is not specifically limited herein.

The scan line drives the display unit of the thin film transistor connected to the scan unit to scan the touch scan electrode progressively while the scan line is driven by the corresponding scan driver. When the touch scan electrode is driven, the touch scan electrode generates a voltage, and a capacitance generated between the corresponding touch sensing electrodes changes. Specifically, when the touch sensing electrode is pressed, the capacitance between the touch sensing electrode and the touch scanning electrode changes, and the touch IC connected to the touch sensing electrode synchronously records the moment of the touch. The number of rows of the scanning electrodes and the number of columns of the touch sensing electrodes are controlled to obtain the touch position coordinates.

For a clear description of the structure and operation of the OLED touch display panel, reference is made to FIG. 2, which is a cross-sectional view of an embodiment of the OLED touch display panel of the present invention.

As shown in FIG. 2 , the OLED touch display panel further includes a substrate 201 , and the substrate 201 is located at an end of the touch sensing electrode 202 facing away from the first passivation layer 203 . By providing the substrate 201 at the outer end, moisture can be effectively blocked, and other components of the OLED touch display panel can be protected.

Specifically, the OLED touch display panel includes a substrate 201 from the outside to the inside, a touch sensing electrode 202 formed on the substrate 201, and a first passivation layer 203 formed on the touch sensing electrode 202. The layer 203 covers the touch sensing electrode 202, and the touch scan electrode 204 is formed on the first passivation layer 203. The touch scan electrode 204 is perpendicular to the touch sensing electrode 202, and is formed on the touch scan electrode 204. The passivation layer 205 covers the touch scan electrode 204 and the thin film transistor layer (not shown) formed on the second passivation layer 205.

In this embodiment, the thin film transistor layer includes a scan line 206, and the touch scan electrode 204 is connected to the scan line 206. The scan line 206 is disposed in parallel with the touch scan electrode 204. The scan line 206 is also connected to the display unit of the thin film transistor layer. The control terminal (not shown) is connected, and the control terminal of the display unit of the thin film transistor layer controls the timing of the scan line 206. The end of the touch sensing electrode 202 is connected to the touch IC (not shown) through the touch IC. The touch sensing electrode 202 is controlled.

When the scan line 206 connected to the display unit is scanned row by row, the touch scan electrode 204 can be driven to scan line by line, and the touch scan electrode 204 is connected to the scan line 206. Specifically, a second passivation layer 205 is formed on the touch scan electrode 204, and a via hole is disposed on the second passivation layer 205. The scan line 206 is overlapped with the touch scan electrode 204 through the through hole, and is connected to the display unit. When the scan line 206 scans line by line, the scan line 206 overlapping the touch scan electrode 204 drives the corresponding touch scan electrode 204 to scan line by line. When the touch scan electrode 204 is driven, the touch scan electrode 204 generates a voltage, and a capacitance generated between the touch sense electrodes 202 corresponding thereto changes. Specifically, when the touch sensing electrode 202 is pressed, the capacitance between the touch sensing electrode 202 and the touch scan electrode 204 changes, and the touch IC connected to the touch sensing electrode 202 is recorded synchronously. At that moment, the number of rows of the scanning electrode 204 and the number of columns of the touch sensing electrodes 202 are touched, thereby obtaining the touch position coordinates.

The substrate 201 may be at least one of glass and quartz.

The thin film transistor layer includes a glass substrate, a gate electrode disposed on the glass substrate, a gate insulating layer formed on the gate electrode, an oxide thin film layer, and a source and a drain disposed on the oxide thin film layer, wherein The source and drain are separated by a channel. The scan line 206 is specifically connected to the gate of the thin film transistor.

Please refer to FIG. 3. FIG. 3 is a cross-sectional view showing another embodiment of the OLED touch display panel of the present invention. The OLED touch display panel of the present embodiment further includes a substrate 301 between the touch sensing electrode 302 and the passivation layer 304. By disposing the substrate 301 between the touch sensing electrode 302 and the passivation layer 304, the OLED touch display panel can be made more convenient and the process is simplified.

Specifically, the OLED touch display panel includes a touch sensing electrode 302, a substrate 301, a touch scan electrode 303 formed on the substrate 301, and a touch scan electrode 303 and a touch sensing electrode 302 disposed vertically. The passivation layer 304 is formed on the touch scan electrode 303, the passivation layer 304 covers the touch scan electrode 303, and a thin film transistor layer (not shown) is formed on the passivation layer 304.

In this embodiment, the thin film transistor layer includes a scan line 305, and the touch scan electrode 303 is connected to the scan line 305. The scan line 305 is disposed in parallel with the touch scan electrode 303. The scan line 305 is also connected to the display unit of the thin film transistor layer. The control terminal (not shown) is connected, the control terminal of the display unit of the thin film transistor layer controls the timing of the scan line 305, and the end of the touch sensing electrode 302 is connected to the touch IC (not shown) through the touch IC. The touch sensing electrode 302 is controlled.

When the scan line 305 connected to the display unit is scanned row by row, the touch scan electrode 303 can be driven to scan line by line, and the touch scan electrode 303 is connected to the scan line 305. Specifically, a passivation layer 304 is formed on the touch scan electrode 303, and a via hole is formed in the passivation layer 304. The scan line 305 is overlapped with the touch scan electrode 303 through the through hole, and the scan line 305 connected to the display unit is When scanning is performed, the scan line 305 overlapping the touch scan electrode 303 drives the corresponding touch scan electrode 303 to scan line by line. When the touch scan electrode 303 is driven, the touch scan electrode 303 generates a voltage, and a capacitance generated between the touch sense electrodes 302 corresponding thereto changes. Specifically, when the touch sensing electrode 302 is pressed, the capacitance between the touch sensing electrode 302 and the touch scanning electrode 303 changes, and the touch IC connected to the touch sensing electrode 302 is recorded synchronously. At that moment, the number of rows of the scanning electrode 303 and the number of columns of the touch sensing electrodes 302 are touched, thereby obtaining the touch position coordinates.

As shown in FIG. 4, FIG. 4 is a schematic top view of an embodiment of an OLED touch display panel of the present invention.

In any of the above embodiments, as shown in FIG. 4 , in the embodiment, the OLED touch display panel includes a substrate 401 in sequence from bottom to top, and the touch sensing electrode 402 formed on the substrate is in the touch sensing electrode 402. The first passivation layer 403 is formed, the first passivation layer 403 covers the touch sensing electrode 402, the touch scan electrode 404 formed on the first passivation layer 403, the touch scan electrode 404 and the touch sensing electrode 402 Vertically disposed, a second passivation layer 405 formed on the touch scan electrode 404, the second passivation layer 405 covers the touch scan electrode 404, and a thin film transistor layer is formed on the second passivation layer 405 (not shown) . The thin film transistor layer includes a scan line 406, and the touch scan electrode 404 is disposed in parallel with the scan line 406 and connected. Specifically, the second passivation layer 405 covers the touch scan electrode 404, and a through hole corresponding to the touch scan electrode 404 (not shown) is disposed on the second passivation layer 405, that is, at each touch At least one through hole is disposed at a position corresponding to the upper side of the scanning electrode 404, and the scanning line 406 is overlapped with the touch scanning electrode 404 through the through hole, wherein the through holes are equally spaced.

In this embodiment, the number of scan lines 406 corresponds to the number of display units, and when the number of touch scan electrodes 404 is not greater than the number of display units, the interval between the plurality of adjacent touch scan electrodes 404 is scanned. The number of lines 406 is equal. That is, when the number of the touch scan electrodes 404 is not greater than the number of the scan lines 406, the number of the scan lines 406 overlapped on the adjacent touch scan electrodes 404 is equal, and since the touch scan electrodes 404 are common In order to avoid the pixel scanning of the touch scan electrode 404 and the scan line 406, the trigger signal of the touch scan electrode 404 and the signal of the scan line 406 need to be shifted, for example, when there are m rows of scan lines and n. When the scan electrode is touched, one scan line is arranged for each m/n row scan line, and the scan line is connected to the corresponding touch scan electrode, and a total of n rows of scan lines are used to contact the scan electrode. While the scan line is progressively scanned, the touch scan electrode is also driven to perform progressive scan, each scan. The m/n row scan line scans one row of touch scan electrodes; when the scan line completes one frame (ie, m lines) of progressive scan, the touch scan electrode will also complete one frame of progressive scan (ie, n Row).

In an alternative embodiment, the through holes are equally spaced.

In any of the above embodiments, in order to more clearly illustrate the operation mode of the OLED touch display panel, in conjunction with FIG. 1 and FIG. 5, FIG. 5 is a schematic diagram of touch timing of the OLED-based touch display panel of the present invention. The timing 501 of the first row of scan lines and the timing 502 of the second row of scan lines of the present embodiment are all timings of the OLED touch display panel, and the timing 503 of the third row of scan lines is the timing of the display panel scan lines. It is also the timing of the touch scan electrodes. In contrast to the timing 101 of the touch scan signal 104 and the first row of scan lines, the timing 102 of the second row of scan lines and the timing 103 of the third row of scan lines are shifted in FIG. 1 , the touch signals are separately set and staggered. The gate scanning time, the invention not only increases the pixel charging time, reduces the complexity of the timing of the operation signal of the panel, but also reduces the number of IC channels of the touch scanning signal.

Specifically, in combination with FIG. 2 to FIG. 5, since the third row of scan lines is connected to the touch scan electrodes, when the touch display panel controls the scan lines for scanning, the touch scan electrodes can be driven to scan. In the present embodiment, the timing of every three rows of scan lines forms one cycle, and one row of scan lines is connected to the touch sensing electrodes in each cycle. In other embodiments, the timing of at least two rows of scan lines is formed in one cycle, and at least one scan line is connected to the touch scan electrodes in each cycle, which is not specifically limited herein.

In any of the above embodiments, the OLED touch display device may be a device having a screen display function, such as a mobile phone or a tablet, and the OLED-based touch display panel of any of the above embodiments may be omitted. limited. Any of the above-mentioned structures is only a specific embodiment, and is not limited. In other embodiments, the direction or structure adjustment may be made according to actual needs. Any structure substantially the same as the work of the present invention belongs to the protection scope of the present invention, and is not used herein. Specifically limited.

According to the above description, the touch display panel of the OLED of the present invention not only increases the scanning excitation signal and the trace by using the scan signal and the trace as the touch scan electrode. The pixel charging time reduces the complexity of the timing of the operation of the panel, and also reduces the number of IC channels of the touch scan signal.

In addition, the present invention further provides an OLED touch display device, and the OLED touch display device includes the OLED touch display panel of any of the above embodiments. For details, refer to the above description, and details are not described herein again.

Please refer to FIG. 6. FIG. 6 is a schematic flow chart of an embodiment of a touch display panel control method according to an embodiment of the present invention.

Step 601: Scanning the scan lines connected to the display unit line by line, and driving the touch scan electrodes to scan progressively, detecting whether there is a change in the voltage across the touch scan electrodes.

In a specific implementation scenario, the OLED touch display panel includes a touch scan electrode and a touch sensing electrode, wherein the touch scan electrode and the touch sensing electrode are spaced apart by the first passivation layer, and the touch scan electrode and the scan are performed. The line is connected, and the scan line is also connected to the control end of the display unit of the thin film transistor layer. When the scan line of the display unit scans line by line, it detects whether the voltage across the touch scan electrode changes. Specifically, when the scan lines of the display unit are scanned row by row, if the position connected to the touch scan electrodes is scanned, the corresponding touch scan electrodes are triggered, and the voltage across the touch scan electrodes changes.

Step 602: Determine the position of the touch sensing electrode corresponding to the touch scan electrode if the voltage across the touch scan electrode is changed.

In a specific implementation scenario, when the control unit detects that the voltage across the touch scan electrode changes, the position coordinate of the touch sensing electrode is determined. Specifically, when the control unit detects that the voltage across the touch scan electrode changes, that is, the touch scan electrode of the row is triggered, the capacitance between the touch scan electrode and the touch sense electrode changes, and the touch The touch IC connected to the sensing electrode synchronously records the number of rows of the touch scan electrodes and the number of columns of the touch sensing electrodes at that moment, thereby obtaining the touch position coordinates.

Step 603: Acquire a display icon corresponding to the position of the touch sensing electrode, and respond to the instruction corresponding to the display icon.

In a specific implementation scenario, the display has a plurality of icons, and the corresponding application functions can be selected according to the icons, and the display icons of each application are different. When the control unit determines the position coordinates of the touch sensing electrodes, the control unit obtains The display icon of the position further responds to the instruction corresponding to the display icon, and the control unit executes the corresponding program.

Different from the prior art, the touch-scan electrode layer is overlapped with the scan line, and the scan signal and the trace of the touch scan electrode are simultaneously used as the scan signal and the trace, which not only increases the pixel charging time, but also reduces the panel charging time. The complexity of running the timing of the electrical signal also reduces the number of IC channels for the touch scan signal.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (16)

1. An organic light emitting diode (OLED) OLED touch display panel, wherein the touch display panel includes: a touch scan electrode and a touch sensing electrode, wherein the touch scan electrode and the touch sensing electrode pass the first blunt a thin film transistor layer is formed on the touch scan electrode, the touch scan electrode is connected to the scan line; and the scan line is further connected to the control end of the display unit of the thin film transistor layer. When the scan lines connected to the display unit are scanned row by row, the touch scan electrodes are driven to scan line by line.
2. The OLED touch display panel of claim 1 , wherein the OLED touch display panel further comprises a substrate, the substrate being located at an end of the touch sensing electrode facing away from the first passivation layer.
3. The OLED touch display panel of claim 1 , wherein the OLED touch display panel further comprises a substrate, the substrate being located between the touch sensing electrode and the first passivation layer.
4. The OLED touch display panel of claim 1 , wherein the number of the scan lines corresponds to the number of the display units; when the number of the touch scan electrodes is smaller than the number of the display units, The number of scanning lines spaced between the adjacent touch scan electrodes is equal.
5. The OLED touch display panel of claim 1 , wherein the display panel further comprises a second passivation layer, the passivation layer covers the touch scan electrode, and the thin film transistor layer is formed in the On the second passivation layer.
6. The OLED touch display panel of claim 5, wherein the second passivation layer is provided with a through hole corresponding to the number of the touch scan electrodes, and the touch scan electrode passes through the through hole The scan lines are connected.
7. The OLED touch display panel according to claim 6, wherein the through holes are equally spaced.
8. An OLED touch display device, wherein the OLED touch display device includes an OLED touch display panel, and the OLED touch display panel includes: a touch scan electrode and a touch sensing electrode, wherein The touch scan electrodes are spaced apart from the touch sensing electrodes by a first passivation layer; a thin film transistor layer is further formed on the touch scan electrodes, and the touch scan electrodes are connected to the scan lines; Connected to the control end of the display unit of the thin film transistor layer, and when the scan line connected to the display unit scans line by line, the touch scan electrode is driven to scan line by line.
9. The OLED touch display device of claim 8 , wherein the OLED touch display panel further comprises a substrate, the substrate being located at an end of the touch sensing electrode facing away from the first passivation layer.
10. The OLED touch display device of claim 8 , wherein the OLED touch display panel further comprises a substrate, the substrate being located between the touch sensing electrode and the first passivation layer.
11. The OLED touch display device according to claim 8, wherein the number of the scan lines corresponds to the number of the display units; when the number of the touch scan electrodes is smaller than the number of the display units, The number of scanning lines spaced between the adjacent touch scan electrodes is equal.
12. The OLED touch display device of claim 8, wherein the display panel further comprises a second passivation layer, the passivation layer covers the touch scan electrode, and the thin film transistor layer is formed in the On the second passivation layer.
13. The OLED touch display device of claim 12, wherein the second passivation layer is provided with a through hole corresponding to the number of the touch scan electrodes, and the touch scan electrode passes through the through hole The scan lines are connected.
14. The OLED touch display device according to claim 13, wherein the through holes are equally spaced.
15. A method for controlling an OLED touch display panel, wherein the OLED touch display panel includes a touch scan electrode and a touch sensing electrode, wherein the touch scan electrode and the touch The sensing electrodes are disposed through the first passivation layer; the touch scan electrodes are connected to the scan lines; and the scan lines are also connected to the control terminals of the display unit of the thin film transistor layer, and the control method includes:

    Detecting whether the voltage across the touch scan electrode is changed when the scan line connected to the display unit scans line by line to drive the touch scan electrode to scan line by line;

    Determining a position of the touch sensing electrode corresponding to the touch scan electrode if the voltage across the touch scan electrode is changed;

    Obtaining a display icon corresponding to the position of the touch sensing electrode, and responding to the instruction corresponding to the display icon.
16. The control method according to claim 15, wherein the step of determining the position of the touch sensing electrode corresponding to the touch scan electrode comprises:

    Determining the position coordinates of the touch sensing electrode according to the number of rows of the current scanning line and the number of columns of the touch sensing electrodes;

    The scan line is disposed perpendicular to the touch sensing electrode.