CN108762551B

CN108762551B - Touch display panel, device and driving method thereof

Info

Publication number: CN108762551B
Application number: CN201810469457.5A
Authority: CN
Inventors: 邹祥祥
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2018-05-16
Filing date: 2018-05-16
Publication date: 2021-10-19
Anticipated expiration: 2038-05-16
Also published as: CN108762551A

Abstract

The embodiment of the invention provides a touch display panel, a touch display device and a driving method of the touch display device. The touch display panel comprises a plurality of pixel units and touch lines, each pixel unit comprises a driving unit, a switch unit, a first electrode and a second electrode, the driving unit is used for generating driving current, the switch unit is used for controlling the second electrodes to be respectively connected with the driving unit or the touch lines, the first electrodes are used for emitting light under the driving of the driving current, and the second electrodes are used for being connected with the driving unit when the switch unit is in use and are used as light-emitting electrodes to emit light under the driving of the driving current or are connected with the touch lines to be used as touch electrodes for touch detection of the touch lines. According to the invention, the pixel unit is set into at least two subunits, the switch unit controls the two subunits to emit light simultaneously, or controls one subunit to be used as a light-emitting electrode and the other subunit to be used as a touch electrode, so that the display and touch control are simultaneously driven, and the high-resolution display effect is improved.

Description

Touch display panel, device and driving method thereof

Technical Field

The invention relates to the technical field of display, in particular to a touch display panel, a touch display device and a driving method of the touch display panel.

Background

With the rapid development of display technology, Touch panels (Touch Screen Panel) have gradually spread throughout the lives of people. Currently, touch panels are classified into an Add On Mode (Add On Mode), an On Cell (On Cell), an In Cell (In Cell), and the like according to their composition. The external-hanging touch panel is produced by separately producing the touch module and the display module and then laminating the touch module and the display module together to form the touch panel with the touch function, and has the defects of high manufacturing cost, low light transmittance, thick module and the like. And embedded touch panel is with touch module's touch electrode embedded inside display module assembly, has not only reduced the whole thickness of module greatly, greatly reduced the cost of manufacture moreover, received each big panel producer favour.

The existing embedded touch panel is mainly divided into a mutual capacitance type structure and a self-capacitance type structure, and compared with the touch panel utilizing the mutual capacitance principle, the touch panel utilizing the self-capacitance principle can effectively improve the signal-to-noise ratio of touch control, so that the accuracy of touch control induction is improved.

At present, a self-contained touch display panel adopts a time-sharing driving working mode. Taking an Organic Light Emitting Diode (OLED) display device integrated with a touch function as an example, the time-sharing driving is to divide a frame display period into two periods: the display time interval and the touch time interval, and the driving signals of the two time intervals are processed separately. In the display period, the pixel driving circuit generates a driving current to be output to the anode to form a light emitting unit, and normal display is carried out. In the touch time interval, the touch driving circuit scans the touch signal through the touch line.

The inventor of the present application has found that, in the time-division driving mode in the prior art, since the pixel unit is charged only in the display period within one frame period, the charging time is short, and the high-resolution display effect is reduced.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a touch display panel, a touch display device and a driving method thereof, so as to overcome the defect that the conventional time-sharing driving method reduces the high resolution display effect.

In order to solve the above technical problem, an embodiment of the present invention provides a touch display panel, including a plurality of pixel units arranged in a matrix and a touch line for performing touch detection, each pixel unit including a driving unit, a switch unit, a first electrode and a second electrode, wherein,

a driving unit for generating a driving current;

the switch unit is respectively connected with the driving unit, the second electrode and the touch control line and is used for controlling the second electrode to be connected with the driving unit or the touch control line;

the first electrode is connected with the driving unit and is used for emitting light under the driving of the driving current output by the driving unit;

and the second electrode is used for being connected with the driving unit under the control of the switch unit and used as a light-emitting electrode to emit light under the driving of the driving current output by the driving unit, or is connected with the touch control line and used as a touch control electrode for the touch control line to perform touch detection.

Optionally, the switch unit includes a first thin film transistor and a second thin film transistor, the second electrode is connected to the driving circuit through the first thin film transistor, and is connected to the touch line through the second thin film transistor.

Optionally, the switching unit further comprises a first control line and a second control line, wherein,

a first control line for sequentially outputting a first driving signal and a second driving signal in a display period;

a second control line for sequentially outputting a second driving signal and a first driving signal in the display period;

a first thin film transistor, a gate electrode of which is connected to the first control line, a first electrode of which is connected to the driving circuit, and a second electrode of which is connected to the second electrode, and is used for conducting when the first control line outputs a first driving signal, so that the driving circuit is connected to the second electrode;

and the gate electrode of the second thin film transistor is connected with the second control line, the first pole of the second thin film transistor is connected with the touch line, and the second pole of the second thin film transistor is connected with the second electrode and is used for conducting when the second control line outputs a first driving signal, so that the touch line is connected with the second electrode.

Optionally, the switching unit further comprises a first control line, wherein,

and the gate electrode of the second thin film transistor is connected with the first control line, the first pole of the second thin film transistor is connected with the touch line, and the second pole of the second thin film transistor is connected with the second electrode and is used for conducting when the first control line outputs a second driving signal, so that the touch line is connected with the second electrode.

Optionally, the touch panel further comprises a connecting electrode, wherein the connecting electrode is used for connecting all second electrodes in one touch area to form a touch unit; the touch control lines and the data lines of the touch control display panel are arranged on the same layer, or the touch control lines and the connecting electrodes are arranged on the same layer.

Optionally, the switch unit controls the second electrode to be connected to the driving unit or to be connected to the touch line, and includes:

in a display period of a display cycle, the switch unit controls the second electrode to be connected with the driving unit; and in the display and touch time interval of the display cycle or in the touch time interval of the display cycle, the switch unit controls the second electrode to be connected with the touch line.

Optionally, a first end of the driving circuit is connected to the gate line, a second end of the driving circuit is connected to the data line, and a third end of the driving circuit is connected to the first electrode and the switching unit, respectively.

Optionally, the shape of the first and second electrodes comprises a rectangle, triangle, trapezoid, or U-shape, arranged in a longitudinal, transverse, or interdigitated manner.

The embodiment of the invention also provides a touch display device which comprises the touch display panel.

In order to solve the foregoing technical problem, an embodiment of the present invention further provides a driving method for a touch display panel, where the touch display panel includes a plurality of pixel units arranged in a matrix and a touch line for performing touch detection, each pixel unit includes a driving unit, a switch unit, a first electrode and a second electrode, and the driving method includes:

the driving circuit outputs a driving current to the first electrode in a display period of a display cycle; the switch unit controls the second electrode to be connected with the driving circuit, and the second electrode serves as a light-emitting electrode to receive driving current output by the driving circuit;

in the display and touch time period of the display period, the driving circuit outputs a driving current to the first electrode; the switch unit controls the second electrode to be connected with the touch control line, and the second electrode serves as the touch control electrode to receive a touch control scanning signal provided by the touch control line; alternatively, the first and second electrodes may be,

and in the touch control time interval of the display cycle, the switch unit controls the second electrode to be connected with the touch control line, and the second electrode is used as the touch control electrode to receive a touch control scanning signal provided by the touch control line.

Optionally, the switch unit controls the second electrode to be connected to the driving circuit, and includes:

and the first thin film transistor of the switch unit is switched on, and the second thin film transistor of the switch unit is switched off, so that the second electrode is connected with the driving circuit through the first thin film transistor.

Optionally, the turning on of the first thin film transistor and the turning off of the second thin film transistor includes:

a first control line of the switch unit outputs a first driving signal to enable the first thin film transistor to be conducted, and a second control line of the switch unit outputs a second driving signal to enable the second thin film transistor to be disconnected; alternatively, the first and second electrodes may be,

a first control line of the switch unit outputs a first driving signal to enable the first thin film transistor to be conducted and enable the second thin film transistor to be disconnected.

Optionally, the switch unit controls the second electrode to be connected to the touch line, including:

and the first thin film transistor of the switch unit is switched off, and the second thin film transistor of the switch unit is switched on, so that the second electrode is connected with the touch line through the second thin film transistor.

Optionally, the switching unit, in which the first thin film transistor is turned off and the second thin film transistor is turned on, includes:

the first control line of the switch unit outputs a second driving signal to switch off the first thin film transistor, and the second control line of the switch unit outputs a first driving signal to switch on the second thin film transistor; alternatively, the first and second electrodes may be,

and a first control line of the switch unit outputs a second driving signal to switch off the first thin film transistor and switch on the second thin film transistor.

Optionally, in a display and touch time period, when the driving circuit outputs a driving current to the first electrode, the driving circuit increases the driving current to match a gamma curve of the pixel unit.

The embodiment of the invention provides a touch display panel, a touch display device and a driving method of the touch display panel. The embodiment prolongs the charging time of the pixel units and improves the high-resolution display effect by a simultaneous driving mode.

Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention. The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.

Fig. 1 is a schematic structural diagram of a touch display panel according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a touch display panel according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a touch display panel according to a second embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a touch display panel according to a third embodiment of the present invention;

FIGS. 5a to 5d are schematic structural diagrams of a touch display panel according to a fourth embodiment of the present invention;

FIG. 6 is a flowchart illustrating a driving method of a touch display panel according to a first embodiment of the present invention;

FIG. 7 is a schematic driving timing diagram illustrating a driving method of a touch display panel according to a first embodiment of the present invention;

FIG. 8 is a flowchart illustrating a driving method of a touch display panel according to a second embodiment of the present invention;

FIG. 9 is a driving timing diagram of a touch display panel according to a second embodiment of the invention.

Description of reference numerals:

10-a gate line; 20-data line; 30-touch line;

40-a drive unit; 50-a switching unit; 60 — a first electrode;

70 — a second electrode; 80-connecting electrodes; 51 — a first control line;

52-second control line; 53-first thin film transistor; 54 — a second thin film transistor.

Detailed Description

The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The embodiment of the invention provides a touch display panel, a touch display device and a driving method thereof, which aim to overcome the defects that the display brightness and the high-resolution display effect are reduced in the existing time-sharing driving mode. Fig. 1 is a schematic structural diagram of a touch display panel according to an embodiment of the invention. As shown in fig. 1, the main structure of the touch display panel includes a gate line 10 and a data line 20, the gate line 10 and the data line 20 are perpendicularly crossed to define a plurality of pixel units arranged in a matrix, and a touch line 30 for touch detection. Each pixel cell includes a driving unit 40, a switching unit 50, a first electrode 60, and a second electrode 70. The driving unit 40 is respectively connected to the gate line 10 and the data line 20, and is configured to generate a driving current according to a data signal under the control of a gate signal; the switch unit 50 is respectively connected to the touch line 30, the driving unit 40 and the second electrode 70, and is configured to control the second electrode 70 to be connected to the driving unit 40, or control the second electrode 70 to be connected to the touch line 30; the first electrode 60 is connected to the driving unit 40, and is configured to emit light under the driving of the driving current output by the driving unit 40; the second electrode 70 is connected to the switching unit 50, and is configured to be connected to either the driving unit 40 or the touch line 30 under the control of the switching unit 50, when the second electrode 70 is connected to the driving unit 40, the second electrode 70 serves as a light emitting electrode to emit light under the driving of the driving current output by the driving unit 40, and when the second electrode 70 is connected to the touch line 30, the second electrode 70 serves as a touch electrode for touch detection of the touch line 30. Specifically, in a display period of a display period, the switch unit 50 controls the second electrode 70 to be connected to the driving unit 40, so that the second electrode 70 as a light emitting electrode emits light under the driving of the driving current output by the driving unit 40, and in a display and touch period or a touch period of the display period, the switch unit 50 controls the second electrode 70 to be connected to the touch line 30, so that the second electrode 70 as a touch electrode is used for touch detection of the touch line 30.

According to the touch display panel provided by the embodiment of the invention, the pixel unit is divided into at least two sub-units, the switch unit controls the two sub-units to emit light simultaneously as the light emitting units, or controls one sub-unit to emit light and the other sub-unit to serve as the touch electrode, so that the display and touch simultaneous driving is realized. The embodiment prolongs the charging time of the pixel unit by the simultaneous driving mode, avoids the defect that the charging time of the existing time-sharing driving mode is short, and effectively improves the high-resolution display effect.

The touch display panel of the embodiment of the invention can be implemented in various ways, and the technical solution of the embodiment of the invention is described in detail through specific embodiments.

First embodiment

Fig. 2 is a schematic structural diagram of a touch display panel according to a first embodiment of the invention, wherein the display panel is an OLED display panel. As shown in fig. 2, the main structure of the touch display panel of this embodiment includes a plurality of gate lines 10 arranged in parallel, a plurality of data lines 20 arranged in parallel, and a plurality of touch lines 30 arranged in parallel and at the same layer as the data lines 20, the plurality of gate lines 10 and the plurality of data lines 20 are crossed perpendicularly to define a plurality of pixel units, the plurality of pixel units are regularly arranged in a matrix manner, and each pixel unit is a most basic light emitting unit and emits light of a single color, which is also referred to as a sub-pixel. Generally, three pixel units, such as a red pixel unit, a green pixel unit, and a blue pixel unit, constitute one pixel. In this embodiment, each pixel unit is divided into two sub-units, each sub-unit is provided with an electrode, namely a first electrode 60 and a second electrode 70, and the electrodes in the two sub-units are independent of each other. Wherein the first electrode 60 and the second electrode 70 are both anodes of the OLED display panel. It is understood that the gate line and the data line perpendicularly cross in this embodiment means that the gate line and the data line perpendicularly cross in projection on the substrate, and the gate line and the data line are not in direct contact due to the presence of the gate insulating layer.

In this embodiment, a driving unit 40 and a switching unit are further disposed in each pixel unit. The first end of the driving circuit 40 is connected to the gate line 10, the second end is connected to the data line 20, and the third end is connected to the first electrode 60 and the switching unit, respectively, under the control of the gate scanning signal provided by the gate line 10, the driving unit 40 generates a driving current according to the data signal provided by the data line 20, and outputs the driving current to the first electrode 60, so that the first electrode 60 emits light under the driving of the driving current output by the driving unit 40. The switching unit includes a first control line 51, a second control line 52, a first thin film transistor 53 and a second thin film transistor 54, the first thin film transistor 53 and the second thin film transistor 54 being thin film transistors of the same type, e.g., the first and second thin film transistors are both NMOS type, or the first and second thin film transistors are both PMOS type. Wherein the content of the first and second substances,

the first control line 51 is disposed in parallel with the gate line 10 and adjacent to the gate line 10, and sequentially outputs a first driving signal and a second driving signal during one display period.

The second control line 52 is disposed in parallel with the gate line 10 and adjacent to the gate line 10, for sequentially outputting the second driving signal and the first driving signal in the same display period.

The first thin film transistor 53 has a gate electrode connected to the first control line 51, a first electrode connected to the driving unit 40, and a second electrode connected to the second electrode 70, and is configured to be turned on when the first control line 51 outputs a first driving signal (e.g., a high level), so as to connect the driving unit 40 and the second electrode 70, and to output a driving current generated by the driving unit 40 to the second electrode 70, and the second electrode 70 emits light under the driving of the driving current output by the driving unit 40. The first thin film transistor 53 is also used to turn off when the first control line 51 outputs the second driving signal (e.g. low level), and isolate the driving unit 40 from the second electrode 70.

The second thin film transistor 54 has a gate electrode connected to the second control line 52, a first electrode connected to the touch line 30, and a second electrode connected to the second electrode 70, and is configured to be turned on when the second control line 52 outputs a first driving signal (e.g., a high level), and connect the touch line 30 and the second electrode 70, so that the touch line 30 performs touch detection, and generates a touch detection signal to output to a touch driving circuit (not shown). The second thin film transistor 54 is also used to turn off when the second control line 52 outputs the second driving signal (e.g., low level), isolating the touch control line 30 from the second electrode 70.

The first electrode of the thin film transistor is a source electrode and the second electrode is a drain electrode, or the first electrode is a drain electrode and the second electrode is a source electrode. The display period may be one frame display period.

It should be understood that fig. 2 shows the first and second control lines disposed next to the gate lines, however, in practical applications, the first and second control lines may be disposed at other positions in the pixel unit, and the corresponding technical solutions can also achieve the basic object of the present invention, and accordingly, should also fall within the protection scope of the present invention.

As can be seen from the above description, the structural feature of the present embodiment is that the first electrode 60 is directly connected to the driving unit 40, and the second electrode 70 is connected to the driving unit 40 through the first thin film transistor 53, and is connected to the touch line 30 through the second thin film transistor 54. The first electrode 60 is used to form a first light emitting region of the pixel unit under the action of the driving current output by the driving unit 40. When the first thin film transistor 53 is turned on and the second thin film transistor 54 is turned off, the second electrode 70 serves as a light emitting electrode of the pixel unit, and forms a second light emitting region of the pixel unit by the driving current output from the driving unit 40, and when the first thin film transistor 53 is turned off and the second thin film transistor 54 is turned on, the second electrode 70 serves as a touch electrode of the pixel unit, so that the touch line 30 performs touch detection.

In this embodiment, one frame display period is divided into two periods: one time period is a display time period, and the other time period is a display and touch time period. The working principle of the touch display panel of the embodiment is as follows: in the display period, the first thin film transistor 53 is turned off (on), the second thin film transistor 54 is turned on (off), and the driving unit 40 simultaneously outputs a driving current to the first electrode 60 and the second electrode 70, under the driving current, the first electrode 60 forms a first light emitting area of the pixel unit, and the second electrode 70 forms a second light emitting area of the pixel unit, so that complete light emission of the pixel unit is realized. In the display and touch periods, the first thin film transistor 53 is turned on, and the second thin film transistor 54 is turned off; since the first thin film transistor 53 is turned on, the driving unit 40 outputs a driving current only to the first electrode 60, and the first electrode 60 forms a first light emitting region of the pixel unit by the driving current, thereby realizing partial light emission of the pixel unit. Meanwhile, since the second thin film transistor 54 is turned off, the second electrode 70 is connected to a touch driving circuit (not shown) through the touch line 30, and the second electrode 70 forms a touch electrode of the pixel unit and serves as the touch electrode for touch detection, so that the touch position determination is realized. In the display and touch time period, the first electrode 60 emits light under the action of the driving current, so that the display and touch are simultaneously driven. In practical implementation, in the display and touch time period, the driving current output to the first electrode 60 can be increased through the driving circuit to realize Gamma curve matching, so as to avoid brightness reduction caused by only the first electrode emitting light, or eliminate the occurrence of low-gray-scale defective pixel points.

In actual implementation, the duration of the two time periods can be determined according to actual requirements of display and touch. Of course, all of the display period of one frame may be used as the display and touch time period, or all of the display period of one frame may be used as the display time period.

The technical solution of the embodiment is further described below by the preparation process of the touch display panel. The "patterning process" in this embodiment includes processes such as depositing a film, coating a photoresist, exposing a mask, developing, etching, and stripping the photoresist, and is a well-established manufacturing process. The deposition may be performed by a known process such as sputtering, evaporation, chemical vapor deposition, etc., the coating may be performed by a known coating process, and the etching may be performed by a known method, which is not particularly limited herein.

First, a gate line, a gate driving line, a first control line and a second control line pattern are formed on a substrate through a patterning process. The forming of the pattern includes: depositing a first metal film on a substrate, coating a layer of photoresist on the first metal film, exposing and developing the photoresist by adopting a single-tone mask, forming an unexposed area at the pattern position, reserving the photoresist, forming a completely exposed area at other positions, removing the photoresist, etching the first metal film in the completely exposed area and stripping the residual photoresist to form a grid line, a grid driving line, a first control line and a second control line pattern. The gate driving line is connected to the gate line and outputs a gate scanning signal to the driving unit. Then, a gate insulating layer is deposited, and the gate insulating layer covers the pattern.

And depositing an active layer film on the substrate with the patterns, and forming the active layer patterns through a patterning process. Each of the active layers includes an active layer of the driving unit, an active layer of the first thin film transistor, and an active layer of the second thin film transistor.

And then, depositing a second metal film on the substrate on which the pattern is formed, and forming a data line, a touch line, a source-drain electrode of the driving unit, a source-drain electrode of the first thin film transistor and a source-drain electrode of the second thin film transistor through a composition process. The source electrode of the driving unit is connected with the data line, the source electrode of the first thin film transistor is connected with the drain electrode of the driving unit, and the source electrode of the second thin film transistor is connected with the touch line.

And then, depositing a passivation layer film on the substrate with the patterns, and forming a first via hole pattern, a second via hole pattern and a third via hole pattern through a composition process, wherein the first via hole exposes the drain electrode of the first thin film transistor, the second via hole exposes the drain electrode of the second thin film transistor, and the third via hole exposes the drain electrode of the driving unit.

And then, depositing a transparent conductive film on the substrate with the patterns, and forming a first electrode pattern and a second electrode pattern through a patterning process. The second electrode is connected with the drain electrode of the first thin film transistor through the first through hole and is also connected with the drain electrode of the second thin film transistor through the second through hole, and the first electrode is connected with the drain electrode of the driving unit through the third through hole. In this embodiment, the first electrode serves as an anode of the OLED, and the second electrode serves as both the anode of the OLED and the touch electrode.

The light emitting layer, the cathode, the encapsulation layer, and the like can be sequentially formed, and the structure and the preparation process are the same as those of the conventional process, which are not described herein again.

In practical implementation, the substrate may be a glass substrate or a quartz substrate. The first metal film and the second metal film may be one or more of platinum Pt, ruthenium Ru, gold Au, silver Ag, molybdenum Mo, chromium Cr, aluminum Al, tantalum Ta, titanium Ti, tungsten W, and the like. The gate insulating layer and the passivation layer can be made of SiNx, SiOx or SiNx/SiOx composite film. The active layer material may be polysilicon to form a Low Temperature Polysilicon (LTPS) thin film transistor, or may be metal Oxide to form an Oxide (Oxide) thin film transistor. The transparent conductive film can adopt Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

It should be noted that the above-described processes are only for illustrating the structure of the touch display panel. In practical implementation, the touch display panel of this embodiment may be manufactured by using corresponding patterning process times, which is not specifically limited herein. Although the structure of the thin film transistor is described in this embodiment by taking a bottom gate structure as an example, in practical implementation, the thin film transistor may also adopt a top gate structure, and this embodiment is not limited in this respect.

Although the embodiment has been described by taking an example in which the pixel unit is provided with two sub-units, in practical implementation, the pixel unit may be provided with a plurality of sub-units, such as 3, 4 or more sub-units, and each sub-unit is provided with one electrode. Through setting up a plurality of electrodes, can satisfy multiple demand that have pertinence, improved the flexibility of design. For example, if the pixel unit is provided with 3 sub-units, in one scheme, 2 electrodes can be provided as the first electrode, and 1 electrode can be provided as the second electrode, so that the display performance is emphasized; in another scheme, 1 electrode can be used as a first electrode, and 2 electrodes can be used as second electrodes, so that the touch performance is emphasized. Further, even if each pixel unit is divided into only two sub-units, the areas of the two sub-units may be set to be different to emphasize display or touch performance.

The present embodiment provides a fully embedded (Full In Cell) self-contained touch display panel, In which a pixel unit is configured as at least two sub-units, and the two sub-units are made to emit light simultaneously as a light emitting unit by controlling a switch unit including a first thin film transistor and a second thin film transistor, or one sub-unit is controlled to emit light as a light emitting unit and the other sub-unit is controlled to serve as a touch electrode, so that display and touch simultaneous driving are achieved. The embodiment prolongs the charging time of the pixel unit by the simultaneous driving mode, avoids the defect that the charging time of the existing time-sharing driving mode is short, and improves the high-resolution display effect.

Second embodiment

Fig. 3 is a schematic structural diagram of a touch display panel according to a second embodiment of the invention. As shown in fig. 3, the present embodiment is an extension of the structure of the first embodiment, and the main structure of the touch display panel is the same as that of the first embodiment, and includes a plurality of parallel gate lines 10, a plurality of parallel data lines 20, and a plurality of parallel touch lines 30, where the plurality of gate lines 10 and the plurality of data lines 20 intersect perpendicularly to define a plurality of pixel units, each pixel unit is divided into two sub-units, and each sub-unit is provided with an electrode, namely a first electrode 60 and a second electrode 70. Each pixel unit is further provided with a driving unit 40 and a switching unit, the driving unit 40 is respectively connected with the gate line 10, the data line 20, the switching unit and the first electrode 60, under the control of a gate scanning signal provided by the gate line 10, the driving unit 40 generates a driving current according to a data signal provided by the data line 20 and outputs the driving current to the first electrode 60, so that the first electrode 60 emits light under the driving of the driving current output by the driving unit 40. In contrast, in the present embodiment, the switching unit includes the first control line 51, the first thin film transistor 53, and the second thin film transistor 54, and the first thin film transistor 53 and the second thin film transistor 54 are different types of thin film transistors. For example, the first thin film transistor is of NMOS type, the second thin film transistor is of PMOS type; alternatively, the first thin film transistor is of a PMOS type and the second thin film transistor is of an NMOS type. Wherein the content of the first and second substances,

A first thin film transistor 53 having a gate electrode connected to the first control line 51, a first electrode connected to the driving unit 40, and a second electrode connected to the second electrode 70, and configured to be turned on when the first control line 51 outputs a first driving signal (e.g., a high level), and connect the driving unit 40 and the second electrode 70, so that the driving current generated by the driving unit 40 is output to the second electrode 70, and the second electrode 70 emits light under the driving of the driving current output by the driving unit 40; the first thin film transistor 53 is also used to turn off when the first control line 51 outputs the second driving signal (e.g. low level), and isolate the driving unit 40 from the second electrode 70.

A second thin film transistor 54 having a gate electrode connected to the first control line 51, a first electrode connected to the touch line 30, and a second electrode connected to the second electrode 70, for disconnecting when the first control line 51 outputs a first driving signal (e.g. high level) to isolate the touch line 30 from the second electrode 70; and is further configured to be turned on when the first control line 51 outputs a second driving signal (e.g., a low level), connect the touch line 30 and the second electrode 70, enable the touch line 30 to perform touch detection, generate a touch detection signal, and output the touch detection signal to the touch driving circuit.

Also, the present embodiment divides one frame display period into two periods: one period is a display period, and the other period is a display and touch period, and the operation principle is the same as that of the first embodiment, except that one control line is used to simultaneously control the first thin film transistor and the second thin film transistor, and when the first control line outputs the first drive signal of high level, the first thin film transistor is turned on, and the second thin film transistor is turned off. And outputting a low-level second driving signal at the first control line, wherein the first thin film transistor is disconnected, and the second thin film transistor is connected.

The manufacturing process of the touch display panel of this embodiment is basically the same as that of the first embodiment, except that one of the first thin film transistor and the second thin film transistor is NMOS type, and the other is PMOS type.

Like the first embodiment, in this embodiment, the charging time of the pixel unit is prolonged by the simultaneous driving method, so that the defect of short charging time in the existing time-sharing driving method is overcome, and the high-resolution display effect is improved.

Third embodiment

Fig. 4 is a schematic structural diagram of a touch display panel according to a third embodiment of the invention. As shown in fig. 4, the present embodiment is based on an extension of the first and second embodiments, and the main structure of the touch display panel is the same as that of the first and second embodiments. In contrast, the touch display panel of the present embodiment is further provided with a connection electrode 80, and the connection electrode 80 is used for connecting all the second electrodes in one touch area to form a touch unit. Specifically, the touch area may be a rectangle with a size of about 4 × 4mm or 5 × 5mm, covering the plurality of pixel units, all the second electrodes in the touch area are connected by the connection electrode 80 to form a self-contained touch unit, and the touch unit is connected to the touch driving circuit by the touch lines.

The connection electrode 80 of this embodiment may be made of metal, after the first electrode and the second electrode are prepared, an insulating layer with a via hole is formed through a patterning process, then a metal film is deposited, and a mesh-shaped connection electrode 80 is formed through the patterning process, where the connection electrode 80 is connected to the source electrode of each second thin film transistor in the touch region through the via hole formed in the insulating layer. Thus, when the second thin film transistor is turned on, the connection electrode 80 puts all the second electrodes in the touch area into a full-surface conduction state. The touch of a human finger can cause the self-capacitance of the touch unit to change, and the touch driving circuit judges the specific coordinate of the finger according to the capacitance change of the touch unit.

As a structural variation, the touch line of the present embodiment may also be provided in a structure in the same layer as the connection electrode. In the foregoing embodiment, the touch lines and the data lines are disposed in the same layer and are formed simultaneously by a single patterning process. Because the connection electrode is arranged in the embodiment, the touch line can be formed at the same time when the connection electrode is formed, namely the touch line and the connection electrode are arranged in the same layer. Thus, when the data lines and the source and drain electrodes are formed through the composition process, the touch lines are not prepared, and when the mesh-shaped connection electrodes are formed through the composition process, the touch lines connected with the connection electrodes are simultaneously prepared. Because only one touch line is needed for one touch unit, the number of the touch lines can be greatly reduced.

Like the first embodiment, in this embodiment, the charging time of the pixel unit is prolonged by the simultaneous driving method, so that the defect of short charging time in the existing time-sharing driving method is overcome, and the high-resolution display effect is improved. In addition, in the embodiment, by arranging the connecting electrodes, all the second electrodes in the touch area can be in the whole-surface conduction state in the display and touch time periods, so that the touch precision is improved.

Fourth embodiment

Fig. 5a to 5d are schematic structural diagrams of a touch display panel according to a fourth embodiment of the invention. The present embodiment is based on an extension of the aforementioned three embodiments, and the main structure of the touch display panel is the same as that of the aforementioned embodiments. In contrast, the first and second electrodes in the foregoing embodiment are two rectangles and are vertically arranged, whereas in the present embodiment, the two rectangular first and second electrodes are horizontally arranged, as shown in fig. 5 a.

In practical implementation, the shapes and arrangement of the first electrode and the second electrode can be comprehensively considered according to the structural design of the pixel unit. For example, the first electrode and the second electrode may be designed in two triangular shapes, as shown in fig. 5 b. As another example, the first electrode and the second electrode may be designed in two trapezoidal shapes, as shown in fig. 5 c. As another example, the first electrode and the second electrode may be designed in two U shapes, arranged in an interdigitated manner, as shown in fig. 5 d. It should be noted that, in this embodiment, the shape and arrangement of the first electrode and the second electrode may also be set in any other suitable manner, and this embodiment is not particularly limited herein.

Fifth embodiment

Fig. 6 is a flowchart illustrating a driving method of a touch display panel according to a first embodiment of the invention. Based on the structure of the touch display panel in the foregoing embodiments, the present embodiment provides a driving method of a touch display panel. As shown in fig. 6, the driving method of the touch display panel of this embodiment includes:

s11, in the display period of a display cycle, the drive circuit outputs a drive current to the first electrode, and the first electrode emits light under the action of the drive current; the switch unit controls the second electrode to be connected with the driving circuit, and the second electrode is used as a light-emitting electrode to receive the driving current output by the driving circuit;

s12, in the display and touch time interval of the display period, the driving circuit outputs a driving current to the first electrode, and the first electrode emits light under the action of the driving current; the switch unit controls the second electrode to be connected with the touch control line, and the second electrode is used as the touch control electrode to receive the touch control scanning signal provided by the touch control line.

In this embodiment, the structures of the driving unit, the switching unit, the first electrode, the second electrode, and the touch line are the same as those of the previous embodiments. The driving unit is used for generating a driving current according to the data signal under the control of the gate signal. The switch unit is respectively connected with the touch control line, the driving unit and the second electrode and is used for controlling the second electrode to be connected with the driving unit or the second electrode to be connected with the touch control line. The first electrode is connected with the driving unit and used for emitting light under the driving of the driving current output by the driving unit. The second electrode is connected with the switch unit, is used for being connected with the driving unit under the control of the switch unit and is used as a light-emitting electrode to emit light under the drive of the driving current, or is used for being connected with the touch control line under the control of the switch unit and is used as a touch control electrode for touch detection of the touch control line.

In step S11, the method for controlling the second electrode to be connected to the driving circuit includes:

the first thin film transistor of the switch unit is switched on, and the second thin film transistor is switched off, so that the second electrode is connected with the driving circuit through the first thin film transistor. At this time, the second electrode is isolated from the touch line by the disconnected second thin film transistor.

Specifically, the first control line of the switching unit outputs a first driving signal (e.g., a high level) to turn on the first thin film transistor, and the second control line of the switching unit outputs a second driving signal (e.g., a low level) to turn off the second thin film transistor.

In step S12, the switch unit controls the second electrode to be connected to the touch line, including:

the first thin film transistor of the switch unit is switched off, and the second thin film transistor is switched on, so that the second electrode is connected with the touch line through the second thin film transistor. At this time, the second electrode is isolated from the driving circuit by the first thin film transistor which is turned off.

Specifically, the first control line of the switching unit outputs a second driving signal (e.g., a low level) to turn off the first thin film transistor, and the second control line of the switching unit outputs a first driving signal (e.g., a high level) to turn on the second thin film transistor.

Fig. 7 is a driving timing diagram of the driving method of the touch display panel according to the first embodiment of the invention, which only shows the timing for driving the second electrode. As shown in fig. 7, one frame display period is divided into two periods: and a display time interval, a display time interval and a touch time interval. In the display period, the first control line SW1 of the switching unit outputs a first driving signal of a high level to turn on the first thin film transistor, and at the same time, the second control line SW2 of the switching unit outputs a second driving signal of a low level to turn off the second thin film transistor. At this time, the turned-on first thin film transistor connects the second electrode with the driving circuit, the driving current DATA of the driving circuit is output to the second electrode, and the second electrode emits light under the action of the driving current, thereby realizing display. At this time, since the first electrode also emits light by the driving current, both electrodes in the pixel unit are in a light emitting state. In the display and touch periods, the first control line SW1 of the switching unit outputs the second driving signal of low level to turn off the first thin film transistor, and at the same time, the second control line SW2 of the switching unit outputs the first driving signal of high level to turn on the second thin film transistor. At this time, the second thin film transistor which is turned on connects the second electrode with the TOUCH line, a TOUCH scanning signal TOUCH of the TOUCH line is output to the second electrode, and the second electrode performs TOUCH detection under the action of the TOUCH scanning signal, so that the TOUCH position is determined. At this time, since the first electrode emits light under the action of the driving current to realize display, the pixel unit is actually in a display and touch simultaneous driving state. In the display and touch time period, the driving current output to the first electrode is increased by the driving circuit to match the Gamma (Gamma) curve of the pixel unit, so as to avoid the brightness reduction caused by only the light emission of the first electrode, or eliminate the occurrence of low-gray-scale defective pixel points, and therefore, the driving current in the display and touch time period in fig. 7 is greater than the driving current in the display time period.

In the driving method of the touch display panel provided by this embodiment, the switch unit including the first thin film transistor and the second thin film transistor controls the two electrodes to emit light simultaneously, or controls one electrode to emit light and the other electrode to serve as a touch electrode, so that simultaneous driving of display and touch is achieved. The embodiment prolongs the charging time of the pixel unit by the simultaneous driving mode, avoids the defect that the charging time of the existing time-sharing driving mode is short, and improves the high-resolution display effect.

Sixth embodiment

FIG. 8 is a flowchart illustrating a driving method of a touch display panel according to a second embodiment of the present invention. Based on the structure of the touch display panel in the foregoing embodiments, the present embodiment provides another driving method of the touch display panel. The structure of the touch display panel is the same as that of the previous embodiment. Different from the driving method of the touch display panel in the first embodiment, the present embodiment is a display and touch time-sharing driving method.

In this embodiment, one frame display period is divided into two periods: one period is a display period and the other period is a touch period. As shown in fig. 8, the driving method of the touch display panel of the present embodiment includes:

s21, in the display period of a display cycle, the switch unit controls the second electrode to be connected with the drive circuit, the drive circuit outputs drive current to the first electrode and the second electrode, and the first electrode and the second electrode emit light under the action of the drive current;

and S22, in the touch control time interval of the display cycle, the switch unit controls the second electrode to be connected with the touch control line, and the second electrode is used as the touch control electrode to receive the touch control scanning signal provided by the touch control line.

In step S21, the method for controlling the second electrode to be connected to the driving circuit includes:

Specifically, the first control line of the switching unit outputs a first driving signal (e.g., a high level) to turn on the first thin film transistor and turn off the second thin film transistor.

In step S22, the switch unit controls the second electrode to be connected to the touch line, including:

Specifically, the first control line of the switching unit outputs a second driving signal (e.g., a low level) to turn off the first thin film transistor and simultaneously turn on the second thin film transistor.

Fig. 9 is a schematic diagram of a driving timing sequence of the touch display panel according to the second embodiment of the invention, which only shows the timing sequence for driving the second electrodes. As shown in fig. 9, in the display period, the first control line SW1 of the switching unit outputs the first driving signal of high level, turning on the first thin film transistor and simultaneously turning off the second thin film transistor. At this time, the turned-on first thin film transistor connects the second electrode with the driving circuit, the driving current DATA of the driving circuit is output to the second electrode, and the second electrode emits light under the action of the driving current. At this time, since the first electrode also emits light under the action of the driving current, both electrodes in the pixel unit emit light, and the pixel unit is in a display state. In the touch period, the first control line SW1 of the switching unit outputs the second driving signal of low level to turn off the first thin film transistor and turn on the second thin film transistor at the same time. At this time, the second thin film transistor which is turned on connects the second electrode with the TOUCH line, a TOUCH scanning signal TOUCH of the TOUCH line is output to the second electrode, and the second electrode performs TOUCH detection under the action of the TOUCH scanning signal, so that the TOUCH position is determined. In the touch control time period, the first electrode does not emit light because the driving circuit does not output the driving current, so that two electrodes in the pixel unit do not emit light, and the pixel unit is in a touch control state. Thus, display and touch time-sharing driving is realized.

Seventh embodiment

Based on the inventive concept of the foregoing embodiments, an embodiment of the present invention further provides a touch display device, which includes the touch display panel adopting the foregoing embodiments. The touch display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Moreover, the use of "first," "second," and the like herein does not denote any order, quantity, or importance, but rather the terms first, second, and the like are used to distinguish one element from another.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly to each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A touch display panel is characterized by comprising a plurality of pixel units arranged in a matrix manner and touch lines for touch detection, wherein each pixel unit comprises a driving unit, a switch unit, a first electrode and a second electrode, and the first electrode and the second electrode are anodes of Organic Light Emitting Diodes (OLEDs); wherein the content of the first and second substances,

a driving unit for generating a driving current;

2. The touch display panel according to claim 1, wherein the switch unit comprises a first thin film transistor and a second thin film transistor, the second electrode is connected to the driving circuit through the first thin film transistor, and is connected to the touch line through the second thin film transistor.

3. The touch display panel of claim 2, wherein the switch unit further comprises a first control line and a second control line, wherein,

4. The touch display panel of claim 2, wherein the switch unit further comprises a first control line, wherein,

5. The touch display panel according to any one of claims 1 to 4, further comprising a connection electrode, wherein the connection electrode is used for connecting all the second electrodes in one touch area to form a touch unit; the touch control lines and the data lines of the touch control display panel are arranged on the same layer, or the touch control lines and the connecting electrodes are arranged on the same layer.

6. The touch display panel according to any one of claims 1 to 4, wherein the switch unit controls the second electrode to be connected to the driving unit or to be connected to the touch line, and comprises:

7. The touch display panel according to any one of claims 1 to 4, wherein a first terminal of the driving circuit is connected to the gate line, a second terminal of the driving circuit is connected to the data line, and a third terminal of the driving circuit is connected to the first electrode and the switching unit, respectively.

8. The touch display panel according to any one of claims 1 to 4, wherein the first electrode and the second electrode have a rectangular, triangular, trapezoidal or U-shaped shape, and are arranged in a longitudinal, transverse or finger-inserting manner.

9. A touch display device comprising the touch display panel according to any one of claims 1 to 8.

10. The driving method of the touch display panel is characterized in that the touch display panel comprises a plurality of pixel units arranged in a matrix manner and touch lines for touch detection, each pixel unit comprises a driving unit, a switch unit, a first electrode and a second electrode, and the first electrode and the second electrode are anodes of Organic Light Emitting Diodes (OLEDs); the driving method comprises the following steps:

11. The driving method according to claim 10, wherein the switching unit controls the second electrode to be connected to the driving circuit, and includes:

12. The driving method according to claim 11, wherein the first thin film transistor is turned on and the second thin film transistor is turned off, and comprising:

13. The driving method according to claim 10, wherein the controlling of the second electrode to be connected to the touch line by the switch unit comprises:

14. The driving method according to claim 13, wherein the switching unit turns off the first thin film transistor and turns on the second thin film transistor, and comprises:

15. The driving method according to any one of claims 10 to 14, wherein the driving circuit increases the driving current to match a gamma curve of the pixel unit when the driving circuit outputs the driving current to the first electrode during the display and touch periods.