CN112259051A - Organic light emitting display panel and display device - Google Patents
Organic light emitting display panel and display device Download PDFInfo
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- CN112259051A CN112259051A CN202011254209.2A CN202011254209A CN112259051A CN 112259051 A CN112259051 A CN 112259051A CN 202011254209 A CN202011254209 A CN 202011254209A CN 112259051 A CN112259051 A CN 112259051A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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Abstract
The embodiment of the application provides an organic light-emitting display panel and a display device, relates to the technical field of display, and can reduce interference of a display process to a touch function, so that a touch effect is improved. The organic light emitting display panel includes: the pixel driving circuit comprises a driving transistor, and the control end of the driving transistor is electrically connected to the first node; the pixel driving circuit is used for responding to the effective level on the corresponding first scanning line and charging a first node with a reference voltage value Vref; the touch control electrode is used for transmitting touch control signals in a plurality of periodic touch control time intervals; each touch time interval is overlapped with one charging time interval, in each touch time interval and the charging time interval overlapped with the touch time interval, the difference between the starting time of the touch time interval and the starting time of the charging time interval is a, and a is larger than 0.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to an organic light emitting display panel and a display device.
Background
At present, with the development of display technology, Organic Light-Emitting display (OLED) panels are becoming more and more popular due to their effects of being thinner, higher in brightness, lower in power consumption, and fast in response, and the like, in the OLED panels, there are Organic Light-Emitting devices including an anode, a cathode, and an Organic Light-Emitting layer therebetween, and in the display process, voltages need to be applied to the cathode and the anode, respectively, to make the Organic Light-Emitting layer emit Light, thereby realizing image display; in order to realize the touch function, the OLED panel further has a touch electrode, and the touch position can be determined by detecting an induction signal on the touch electrode, so as to realize the touch function. However, the conventional cathode is close to the touch electrode, and when the voltage on the cathode changes, the signal on the touch electrode is easily interfered, thereby having a bad influence on the touch function.
Disclosure of Invention
The embodiment of the application provides an organic light-emitting display panel and a display device, which can reduce the interference of a display process to a touch function, thereby improving the touch effect.
In a first aspect, an embodiment of the present application provides an organic light emitting display panel, including:
the pixel driving circuit comprises a driving transistor and a capacitor, wherein the control end of the driving transistor is electrically connected to a first node, and the first node is electrically connected to one end of the capacitor;
a first scan line connected to each row of pixel driving circuits, wherein a frame display period includes an i-th scan period corresponding to the i-th row of pixel driving circuits, i has values of 1, 2, 3, …, n, and n is the largest row number of pixel driving circuits, and in the i-th scan period, a first scan signal transmitted by the first scan line corresponding to the i-th row of pixel driving circuits is composed of a charging period corresponding to an active level and a non-charging period corresponding to a non-active level, and the pixel driving circuits are configured to charge the first node having the reference voltage value Vref in response to the active level on the corresponding first scan line;
the touch control electrode is used for transmitting a touch control signal in a plurality of periodic touch control time intervals;
each touch time interval is overlapped with one charging time interval, in each touch time interval and the charging time interval overlapped with the touch time interval, the difference between the starting time of the touch time interval and the starting time of the charging time interval is a, and a is larger than 0.
In one possible embodiment of the method according to the invention,
wherein VGMP is a data voltage value corresponding to the black display, Vth is a threshold voltage of the driving transistor, Cst is a capacitance value of the capacitor,
is the channel width-to-length ratio of the drive transistor.
In one possible implementation, in each of the touch periods and the charging period overlapping therewith, an end time of the touch period is subsequent to an end time of the charging period.
In a possible implementation manner, the end time of the touch time period is before the end time of a corresponding one of the scanning time periods.
In one possible implementation, in each of the touch periods and the charging period overlapping therewith, an end time of the touch period is before an end time of the charging period.
In one possible implementation, in each of the touch periods and the charging period overlapping therewith, the difference between the ending time of the charging period and the ending time of the touch period is b, b > 0.5 μ s.
In a possible implementation manner, at least one scanning period is spaced between any two adjacent touch periods.
In one possible embodiment, the organic light emitting display panel further includes:
the data lines are correspondingly connected with the pixel driving circuits of each row, every m data lines form a data line group, and m is greater than 2;
and the multi-channel gating circuit corresponds to each data line group, comprises an input end and m output ends respectively connected with m data lines, further comprises a data line writing time period before the corresponding charging time period, and is used for enabling the input end and the m output ends to be conducted in a time-sharing mode in the data line writing time period.
In one possible implementation, the touch electrode is a mutual capacitance type touch electrode, and the mutual capacitance type touch electrode includes a plurality of driving electrodes and a plurality of sensing electrodes;
every adjacent n touch time intervals form a touch cycle, n is greater than 2, and the plurality of driving electrodes transmit pulse signals in a time-sharing mode in the n touch time intervals.
In one possible embodiment, the organic light emitting display panel further includes:
and the touch unit is used for sampling a touch induction signal on the touch electrode in each touch time interval and determining a touch position according to the touch induction signal.
In one possible implementation, the pixel driving circuit further includes:
a first transistor, a first end of which is electrically connected to a first power voltage end, a second end of which is electrically connected to a second node, and a control end of which is electrically connected to a corresponding light-emitting control line;
a first end of the second transistor is electrically connected to the corresponding data line, a second end of the second transistor is electrically connected to the second node, and a control end of the second transistor is electrically connected to the corresponding first scan line;
a third transistor, a first end of which is electrically connected to the first node, a second end of which is electrically connected to a third node, and a control end of which is electrically connected to the corresponding first scan line;
a fourth transistor, a first end of which is electrically connected to a reference voltage signal end, a second end of which is electrically connected to the first node, a control end of which is electrically connected to the corresponding second scan line, and the reference voltage signal end is used for providing the reference voltage value Vref;
a fifth transistor, a first end of which is electrically connected to the third node, a second end of which is electrically connected to the fourth node, and a control end of which is electrically connected to the corresponding light-emitting control line;
a first end of the sixth transistor is electrically connected to the reference voltage signal end, a second end of the sixth transistor is electrically connected to the fourth node, and a control end of the sixth transistor is electrically connected to the corresponding first scan line;
a light emitting device, an anode of which is electrically connected to the fourth node, and a cathode of which is electrically connected to a second power supply voltage terminal;
the capacitor is connected in series between the first node and the first power supply voltage end;
the first end of the driving transistor is electrically connected to the second node, and the second end of the driving transistor is electrically connected to the third node.
In a second aspect, the present disclosure further provides a display device, including the organic light emitting display panel.
The organic light-emitting display panel and the display device in the embodiment of the application have the advantages that each touch time interval is overlapped with one charging time interval, the display refresh rate can be improved, the difference between the initial time of the touch time interval and the initial time of the charging time interval is set to be a, a is larger than 0, the data line can be charged for a period of time, and touch detection is carried out when the voltage tends to be stable, so that the interference of the voltage change on the data line on the signal on the touch electrode is reduced, namely, the interference of the display process on the touch function is reduced, and the touch effect is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a partial region of an organic light-emitting display panel according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a pixel driving circuit according to an embodiment of the present disclosure;
FIG. 3 is a timing diagram of a portion of a signal line according to an embodiment of the present invention;
FIG. 4 is a timing diagram of a first scan line and a first node at a portion of time in an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a touch electrode according to an embodiment of the present application;
FIG. 6 is a timing diagram of another partial signal line according to an embodiment of the present invention;
FIG. 7 is a timing diagram of another partial signal line according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a multi-way gating circuit according to an embodiment of the present application;
FIG. 9 is a timing diagram of another partial signal line according to an embodiment of the present application;
FIG. 10 is a timing diagram of another partial signal line according to an embodiment of the present application;
FIG. 11 is a timing diagram of another partial signal line in the embodiment of the present application;
FIG. 12 is a schematic cross-sectional view of a portion of the film layer shown in FIG. 5 in the direction AA';
FIG. 13 is a timing diagram of another partial signal line in the embodiment of the present application;
FIG. 14 is a schematic cross-sectional view of a portion of an embodiment of the present application;
fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application,
the terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
An embodiment of the present application provides an organic light emitting display panel, including: the pixel driving circuit 1 comprises a driving transistor Td and a capacitor C, wherein a control end of the driving transistor Td is electrically connected to a first node N1, and a first node N1 is electrically connected to one end of the capacitor C; a first scan line S1 connected to each row of the pixel driving circuits 1, wherein a frame display period includes an i-TH scan period corresponding to the i-TH row of the pixel driving circuits 1, i has values of 1, 2, 3, …, N being the maximum number of rows of the pixel driving circuits, and in the i-TH scan period, a first scan signal transmitted by the first scan line S1 corresponding to the i-TH row of the pixel driving circuits 1 is composed of a charging period TL corresponding to an active level (e.g., a low level) and a non-charging period TH corresponding to a non-active level (e.g., a high level), the pixel driving circuit 1 is configured to charge a first node N1 having a reference voltage value Vref in response to the active level on the corresponding first scan line S1, the reference voltage value Vref being a predetermined fixed potential, and being charged to the first node N1 in a period before the scan period to reset the first node N1; a touch electrode TP for transmitting a touch signal during a plurality of touch time periods TT, where the pulse signal in fig. 3 represents the touch signal; each touch time period TT overlaps one charging time period TL, and in each touch time period TT and the charging time period TL overlapping therewith, the difference between the start time of the touch time period TT and the start time of the charging time period TL is a, a > 0.
Specifically, for example, fig. 1 illustrates six rows of pixel driving circuits 1 from m1 to m6, m1 is the row 1 pixel driving circuit 1, m2 is the row 2 pixel driving circuit 2, m3 is the third row pixel driving circuit, and so on, in fig. 3, only signals on the first scanning line S1(m1) corresponding to the row 1 pixel driving circuit 1 and the first scanning line S1(m2) corresponding to the second row pixel driving circuit 1 are illustrated, it should be noted that the touch electrode TP illustrated in fig. 5 is only an example, and the specific structure of the touch electrode TP in the embodiment of the present application is not limited; in addition, for the signal corresponding to the touch electrode TP in fig. 3, which is also only an example and does not represent an actual signal, in a possible implementation manner, in the touch time period TT, the touch signal transmitted on the touch electrode TP is a pulse signal, where a dotted line indicates that no signal is transmitted at the touch electrode TP at this time, that is, no touch detection is performed at a position corresponding to the dotted line. In the following, the embodiment of the present invention will be further described by briefly explaining the display and touch processes, in the process of displaying the image, the pixel driving circuits 1 need to be scanned line by line, so that the data voltages can be charged into the corresponding first nodes N1 line by line, during the charging process of each line of the pixel driving circuits 1, the potential at the control terminal of the driving transistor Td is charged to be related to the corresponding data voltage, after the scanning of the line of the pixel driving circuits 1 is finished, the voltage at the first node N1 is maintained by the capacitor C, so that the driving transistor Td generates the corresponding driving current under the voltage control of the first node N1, the driving current is used for driving the organic light emitting device to emit light based on the gray scale corresponding to the data voltage, after the pixel driving circuit 1 of a certain line completes one scanning charge, the pixel driving circuit 1 of the next line is subjected to the next scanning charge, by analogy, after all the row pixel driving circuits 1 complete one-time charging, the refreshing of one frame of picture is completed, and then the refreshing of the next frame of picture can be performed according to the same logic, that is, the display of the picture can be realized. In the above display process, in order to implement the touch function in the display process, touch detection is also required, the process of touch detection includes transmitting a touch signal on the touch electrode TP and determining a touch position according to the touch signal to implement the touch function, however, in the touch process, since the touch electrode TP is closer to the pixel driving circuit 1 and data lines for transmitting data voltages are distributed at various positions of the panel, if touch detection is performed at a time other than the charging period TL, that is, if there is no overlap between the charging period TL and the touch period TT, a longer time is required for refreshing the display, which results in a lower display refresh rate; in order to increase the display refresh rate, the overlap between the charging period TL and the touch period TT may be controlled, however, if the touch detection starts at the starting time of the charging period TL, the voltage variation on the data line is large due to the large node potential variation of the first node N1, and the voltage variation on the data line affects the potential of the cathode due to the coupling effect and further affects the signal on the touch electrode TP due to the large distribution of the data line in the panel, thereby possibly causing interference to the signal on the touch electrode TP. In the embodiment of the present application, the difference between the start time of the touch time TT and the start time of the charging time TL is set to a, that is, the touch detection is started after a period of charging, and it can be seen from the waveform shown in fig. 4 that the potential variation process at the first node N1 is larger only in the initial stage of the charging time TL, and the potential tends to be stable after a period of time a, that is, the voltage variation at the first node N1 and the voltage variation at the data line are not too large, and at this time, the touch detection is started in the touch time TT, even though the touch signal (e.g. pulse signal) is transmitted on the touch electrode TP to realize the touch function, at this time, since the voltages at the first node N1 and the data line both tend to be stable and have smaller variations, the potential variation at the cathode is not easily caused, and the overall signal in the display panel is stable, the signal of TP on the touch electrode is not easily interfered by the potential change on the data line.
The organic light-emitting display panel in the embodiment of the application is provided with each touch time interval overlapped with one charging time interval, so that the display refresh rate can be improved, on the basis, the difference between the initial time of the touch time interval and the initial time of the charging time interval is set to be a, a is larger than 0, the data line can be charged for a period of time, and touch detection is carried out when the voltage tends to be stable, so that the interference of the voltage change on the data line on the signal on the touch electrode is reduced, namely the interference of the display process on the touch function is reduced, and the touch effect is improved.
In one possible embodiment of the method according to the invention,
wherein VGMP is the data voltage value corresponding to the black state,vth is the threshold voltage of the driving transistor Td, Cst is the capacitance value of the capacitor C,
is the channel width-to-length ratio of the driving transistor Td.
Specifically, a plurality of data lines are distributed in the display panel, and the data lines are used for charging the data voltages to the corresponding first nodes N1 in the pixel driving circuit 1, so that the voltage value at the first node N1 corresponds to the corresponding data voltage value, so as to provide the corresponding sub-pixel luminance according to the potential of the first node N1, the higher the data voltage value transmitted on the data lines is, the darker the sub-pixel luminance is, and when the sub-pixels are in a black state, the data voltage value transmitted on the data lines is the highest data voltage value. As shown in fig. 4, in the charging period TL, the voltage of the first node N1 is finally charged to Vdata- | Vth | from the reference voltage value Vref, where Vdata is a corresponding data voltage value, that is, a voltage value on the data line to which the pixel driving circuit 1 is currently connected, in the charging period TL, the potential of the first node N1 at the beginning is changed greatly, when the voltage on the first node N1 is charged to be different from Vdata- | Vth | by about 0.3V, the current on the driving transistor Td is reduced, that is, the potential on the first node N1 is changed little, and the potential on the corresponding data line is basically stable and unchanged, at this time, the signal of the pixel driving circuit 1 as a whole is stable, and therefore, the voltage on the first node N1 can be selected to enter the touch control period TT after being charged to be different from Vdata- | Vth | by about 0.3V. Drive current of drive transistor Td
Wherein μ represents electron mobility, CoxRepresenting the gate oxide capacitance per unit area,
vgs represents a gate-source voltage difference, and an empirical value of an average current of the driving transistor Td when the voltage of the first node N1 is finally charged from Vref to Vdata-Vth-0.3 according to the simulation
VGMP is the highest data voltage value Vdata on the organic light emitting display panel, the change Q (Vdata- | Vth | -0.3-Vref) xCst of the charge quantity on the capacitor C corresponding to the potential change of the first node N1, the Q (VGMP- | Vth | -0.3-Vref) xCst is calculated according to the maximum value of Vdata, and the time is calculated according to I0 and Q
Therefore, the touch time period TT is entered after the time a passes at the starting time of the charging time period TL for touch detection, so that the interference of display on touch can be reduced, and the display refresh scanning rate can be improved by overlapping part of the charging time period TL and the touch time period TT.
The calculation of the time a is further described below by using two specific examples, for example, Cst 100fF 100 × 10-15，VGMP＝5V，Vref＝-3V，
Vth＝-1.5V，
For example, Cst 200fF 200 × 10-15，VGMP＝5V，Vref＝-2V，
Vth＝-2V，
In one possible embodiment, as shown in fig. 6, in each touch period TT and the charging period TL overlapping therewith, the end time of the touch period TT is after the end time of the charging period TL. Therefore, even after charging is finished, touch detection can be performed, so that enough time is ensured, and the accuracy of touch detection is improved.
In one possible implementation, as shown in fig. 6, the end time of the touch time period TT is before the end time of the corresponding one scanning time period TS. So as to avoid the interference of the signal in the pixel driving circuit 1 to the touch signal in the next scanning period TS.
In one possible implementation, as shown in fig. 3, in each touch period TT and the charging period TL overlapping therewith, the end time of the touch period TT is before the end time of the charging period TL. In this way, the interference of the abrupt signal change on the first scan line S1 to the touch signal at the end of the charging period TL can be avoided.
In one possible embodiment, as shown in fig. 3, in each touch period TT and the charging period TL overlapping therewith, the difference between the ending time of the charging period TL and the ending time of the touch period TT is b, b > 0.5 μ s. In consideration of the signal delay on the touch electrode TP, b is set to be greater than 0.5 μ S to ensure interference of the abrupt signal change on the first scan line S1 to the touch signal.
As shown in fig. 3, the charging time period TL corresponding to the first row of pixel driving circuits 1(m1) and the second row of pixel driving circuits 1(m2) has a corresponding touch time period TT, that is, during the scanning process of each row of pixel driving circuits 1, one touch detection can be performed. For example, in other possible embodiments, at least one scanning period is spaced between any two adjacent touch periods TT, as shown in fig. 1 and 7, where touch detection is performed in the charging period TL corresponding to the first row of pixel driving circuits 1(m1) and the fourth row of pixel driving circuits 1(m4), that is, the corresponding touch period TT is set, and touch detection is not performed in the charging period TL corresponding to the second row of pixel driving circuits 1(m2) and the third row of pixel driving circuits 1(m3), that is, two scanning periods are spaced between two adjacent touch periods TT.
In one possible embodiment, as shown in fig. 1, 8 and 9, the organic light emitting display panel further includes: the Data lines Data are correspondingly connected with the pixel driving circuits 1 in each column, each m Data lines Data form a Data line group Dm, m is greater than 2, it should be noted that only one Data line group Dm is illustrated in fig. 1, and other Data line groups and corresponding pixel driving circuits are omitted; the multiple gate circuit 2 corresponding to each Data line group Dm, that is, each Data line group Dm corresponds to one multiple gate circuit 2, the multiple gate circuit 2 includes an input terminal in and m output terminals out respectively connected to the m Data lines Data, the ith scanning period TS further includes a Data line writing period P before the corresponding charging period TL, and the multiple gate circuit 2 is configured to turn on the input terminal in and the m output terminals out at different times during the Data line writing period P.
Specifically, as shown in fig. 1, 8 and 9, for example, m is 6, that is, each six Data lines Data form a Data line group Dm including six Data lines D1, D2, D3, … and D6, and the multiple gate circuit 2 includes six switching tubes w1, w2, … and w 6. The first end of the switch tube w1 is used as the input end in of the multiplexer circuit 2, the second end of the switch tube w1 is connected to an output end out of the multiplexer circuit 2 and connected to the data line D1, and the control end of the switch tube w1 is connected to the first control signal line CKH 1; the first end of the switch tube w2 is used as the input end in of the multiplexer circuit 2, the second end of the switch tube w1 is connected to the other output end out of the multiplexer circuit 2 and is connected to the data line D2, and the control end of the switch tube w2 is connected to the second control signal line CKH 2; the first end of the switch tube w3 is used as the input end in of the multiplexer circuit 2, the second end of the switch tube w1 is connected to the other output end out of the multiplexer circuit 2 and is connected to the data line D3, and the control end of the switch tube w1 is connected to the third control signal line CKH 3; by analogy, the first end of each switching tube is connected to the input end in of the corresponding multiple gate circuit 2, the second end of each switching tube is respectively connected to the corresponding data line as the output end out of the corresponding multiple gate circuit 2, the control end of each switching tube is respectively connected to a corresponding control signal line, and there are six control signal lines including CKH1, CKH2, CKH3, … and CKH6, and the six control signal lines are used for respectively controlling the on and off of each switching tube to realize the time-sharing on control of the multiple gate circuit 2, for example, the high level in each control signal line in fig. 9 represents the off level for controlling the off of the corresponding switching tube, and the low level represents the on level for controlling the on of the corresponding switching tube. In fig. 9, a scanning period TS is shown, an initial stage of each scanning period TS is a Data line writing period P, in the Data line writing period P, the multiple gate circuit 2 makes the input terminal in and the six output terminals out conduct in a time-sharing manner, the input terminal in of the multiple gate circuit 2 may be connected to one pin of the driving chip IC, that is, the driving chip may write the Data voltage corresponding to each Data line into the Data line Data in the time-sharing manner in the Data line writing period P. For example, in the first time-sharing period of the data line writing period P, the control signal line CKH1 provides a turn-on level, while the other seven control signal lines provide a turn-off level (i.e. an inactive level), i.e. the control switch w1 is turned on, and the other switches are turned off, so that the data voltage at the input terminal in is written into the data line D1 through the switch w 1; in the second time-sharing period of the data line writing period P, the control signal line CKH1 changes to the off level, the control signal line CKH2 changes to the on level, and the other six control signal lines still keep the off level, that is, the control switch tube w2 is turned on, and the other switch tubes are turned off, so that the data voltage at the input end in is written into the data line D2 through the switch tube w 2; by analogy, in the Data line writing period P, the Data voltage is written to each corresponding Data line Data in a time-sharing manner by controlling the control signal line. After the writing of the Data voltage is completed on all six Data lines Data, the Data line enters the charging period TL, at this time, a conducting level (i.e., an effective level) is provided on one first scan line S1, so that the Data voltage written on each Data line Data is charged into the first node N1 of the corresponding pixel driving circuit 1, after a time a elapses from the start time of the charging period TL, the Data line enters the touch period TT for touch detection, after the charging period TL and the touch period TT are completed, the scanning period TS of this time is completed, i.e., the scanning of this line is completed, the scanning of the next line is performed, i.e., the scanning of the next line is performed, and the specific process of each scanning period TS may be the same and is not repeated. It should be noted that, the two adjacent scanning time periods TS shown in fig. 9 both include the touch time period TT, that is, the touch detection is performed in each line scanning process, which is only an example, in other realizable embodiments, each scanning time period TS does not necessarily include the touch time period TT, that is, the touch detection may be performed every several lines scanning.
It should be noted that, in fig. 9, the ending time of the touch time period TT is after the ending time of the charging time period TL and before the ending time of the corresponding one scanning time period TS, that is, before the starting time of the next scanning time period TS, which is only an embodiment, in other embodiments, for example, as shown in fig. 10, in each touch time period TT and the charging time period TL overlapping with the touch time period TT, the ending time of the touch time period TT is before the ending time of the charging time period TL.
In one possible embodiment, as shown in fig. 5 and 11, the touch electrode TP is a mutual capacitance touch electrode, and the mutual capacitance touch electrode TP includes a plurality of driving electrodes Tx and a plurality of sensing electrodes Rx; every adjacent n touch time intervals TT form a touch cycle Z, n is larger than 2, and the plurality of driving electrodes Tx transmit pulse signals in a time-sharing mode in the n touch time intervals TT.
Specifically, as shown in fig. 5, 11 and 12, for example, the touch electrode TP is located on the touch electrode layer 10, where the touch electrode layer 10 includes a first touch metal layer 101, a second touch metal layer 102 and a touch insulating layer 103, and the touch insulating layer 103 is located between the first touch metal layer 101 and the second touch metal layer 102. The plurality of driving electrodes Tx are arranged along a first direction h1, the plurality of sensing electrodes Rx are arranged along a second direction h2, the first direction h1 and the second direction h2 are crossed, for example, the first direction h1 is perpendicular to the second direction h2, the driving electrodes Tx and the sensing electrodes Rx are arranged in an insulated and crossed manner, for example, each driving electrode Tx includes a plurality of driving electrode blocks arranged along the second direction h2 and located on the first touch metal layer 101, any two adjacent driving electrode blocks are connected with each other through a bridge B located on the second touch metal layer 102 in the second direction h2, two ends of the bridge B are respectively connected with the two driving electrode blocks through via holes on the touch insulating layer 103, each sensing electrode Rx includes a plurality of sensing electrode blocks arranged along the first direction h1 and located on the first touch metal layer 101, and any two adjacent driving electrode blocks are connected with each other through a connecting portion F located on the first touch metal layer 101 in the first direction h1, the connecting portion F and the bridge B are located on different metal layers to make the sensing electrode Rx and the driving electrode Tx cross in an insulating manner. In the process of touch detection, a pulse signal (i.e. a touch driving signal) is sequentially provided to each driving electrode Tx, meanwhile, a touch sensing signal is detected on each sensing electrode Rx, and a touch position is determined according to the received touch sensing signal, wherein, assuming that the first direction h1 is an x-axis coordinate direction and the second direction h2 is a y-axis coordinate direction, when a user has a touch operation at a certain position, the mutual capacitance between the driving electrode Tx and the sensing electrode Rx is changed, so that the received sensing signal is changed, according to the principle, the position of the induction electrode Rx corresponding to the change of the induction signal can determine the y-axis coordinate, according to the time corresponding to the change of the sensing signal, which driving electrode Tx corresponds to the change of the sensing signal can be determined, i.e. the x-axis coordinate can be determined, so that the touch position can be determined. Based on the touch detection method, complete touch scanning can be completed only once by at least sequentially sending pulse signals to all the driving electrodes Tx once, and therefore, a time period corresponding to the pulse signals sent by all the driving electrodes Tx once can be used as a touch cycle Z. For example, assuming that the driving electrodes Tx include only four driving electrodes of the first driving electrode Tx1, the second driving electrode Tx2, the third driving electrode Tx3 and the fourth driving electrode Tx4 in total, if the time required for each driving electrode Tx to transmit the sequential pulse signal is long, one touch cycle Z may be divided, for example, when the first row of pixel driving circuits is charged, the pulse signals are supplied only to the first driving electrode Tx1 and the second driving electrode Tx2 to implement the scanning of two driving electrodes, and when the second row of pixel driving circuits is charged, the pulse signals are supplied to the third driving electrode Tx3 and the fourth driving electrode Tx4 to implement the scanning of the other two driving electrodes, and then the touch position is determined according to the scanning results of the four driving electrodes, even though each adjacent n touch periods TT constitute one touch cycle Z. It should be noted that, in other practical implementations, if the time required for the touch scanning is short, the charging process of one row of pixel driving circuits is enough to realize the scanning of all driving electrodes Tx, as shown in fig. 13, each touch time period TT may also be set to be one touch cycle Z, that is, when one row of pixel driving circuits is charged, the scanning of all driving electrodes Tx is completed in the corresponding touch time period TT, that is, a pulse signal is sequentially provided to each driving electrode Tx for one touch time period TT.
In one possible embodiment, the organic light emitting display panel further includes: and a touch unit (not shown in the figure) for sampling a touch sensing signal on the touch electrode TP at each touch time period TT and determining a touch position according to the touch sensing signal.
Specifically, the touch unit may be specifically a driving chip IC, for example, and is configured to utilize the touch electrodes TP to implement a touch detection function, for example, as shown in fig. 5, as for the mutual capacitance type touch electrodes TP, the touch unit is connected to each driving electrode Tx and each sensing electrode Rx, the touch unit generates a touch driving signal and outputs the touch driving signal to the driving electrode Tx, and obtains a touch sensing signal through the sensing electrode Rx, and determines a touch position according to the obtained touch sensing signal. In other possible embodiments, the touch electrode TP may also be a self-contained touch electrode, for example, the self-contained touch electrode may include a plurality of touch electrode blocks arranged in an array, each touch electrode block is connected to an independent touch signal line, and the touch unit provides a touch driving signal to each touch electrode block through the touch signal line and obtains a corresponding touch sensing signal from each touch electrode block, so as to implement a touch detection function. In order to reduce the interference of the detected touch sensing signal in the process of implementing the touch detection by the touch unit, the touch sensing signal needs to be acquired within the touch time period TT, and the touch position is determined according to the touch sensing signal acquired within the touch time period TT.
In one possible implementation, as shown in fig. 2, the pixel driving circuit further includes: a first transistor T1, a first end of the first transistor T1 is electrically connected to the first power voltage terminal PVDD, a second end of the first transistor T1 is electrically connected to the second node N2, and a control end of the first transistor T1 is electrically connected to the corresponding emission control line Emit; a second transistor T2, wherein a first end of the second transistor T2 is electrically connected to the corresponding Data line Data, a second end of the second transistor T2 is electrically connected to the second node N2, and a control end of the second transistor T2 is electrically connected to the corresponding first scan line S1; a third transistor T3, wherein a first terminal of the third transistor T3 is electrically connected to the first node N1, a second terminal of the third transistor T3 is electrically connected to the third node N3, and a control terminal of the third transistor T3 is electrically connected to the corresponding first scan line S1; a fourth transistor T4, a first terminal of the fourth transistor T4 is electrically connected to a reference voltage signal terminal ref, a second terminal of the fourth transistor T4 is electrically connected to the first node N1, a control terminal of the fourth transistor T4 is electrically connected to the corresponding second scan line S2, and the reference voltage signal terminal ref is used for providing a reference voltage value Vref; a fifth transistor T5, a first end of the fifth transistor T5 being electrically connected to the third node N3, a second end of the fifth transistor T5 being electrically connected to the fourth node N4, a control end of the fifth transistor T5 being electrically connected to the corresponding emission control line Emit; a sixth transistor T6, a first terminal of the sixth transistor T6 is electrically connected to the reference voltage signal terminal ref, a second terminal of the sixth transistor T6 is electrically connected to the fourth node N4, and a control terminal of the sixth transistor T6 is electrically connected to the corresponding first scan line S1; a light emitting device DD, an anode of which is electrically connected to the fourth node N4, a cathode of which is electrically connected to the second power voltage terminal PVEE; the capacitor C is connected in series between the first node N1 and the first power supply voltage terminal PVDD; a first terminal of the driving transistor Td is electrically connected to the second node N2, and a second terminal of the driving transistor Td is electrically connected to the third node N3.
Specifically, as shown in fig. 2 and fig. 3, for example, each transistor is a P-type transistor, and then the high level in the corresponding signal is an off level (i.e., an inactive level) and the low level is an on level (i.e., an active level), for example, during the scan charging process of the first row pixel driving circuit 1, the first emission control line Emit therein provides the high level to control the first transistor T1 and the fifth transistor T5 to turn off, and at this time, the current generated by the driving transistor Td does not pass through the light emitting device DD, i.e., the light emitting device DD is controlled not to Emit light, and at this time, the second scanning line S2 provides the low level to control the fourth transistor T4 to turn on, so that the reference voltage value Vref of the reference voltage signal terminal ref is charged to the first node N1 to reset the first node N1, even if the first node N1 is charged to the reference voltage value; then the second scan line S2 provides a high level to control the fourth transistor T4 to turn off, the first scan line S1 provides a low level to control the second transistor T2 and the third transistor T3 to turn on, at this time, the Data voltage on the Data line Data charges the first node N1 through the second transistor T2, the driving transistor Td and the third transistor T3, until the voltage of the first node N1 reaches Vdata- | Vth |, the driving transistor Td turns off, and at the same time, the sixth transistor T6 is controlled to turn on, so that the reference voltage value Vref of the reference voltage signal terminal ref is charged to the fourth node N4, and the fourth node N4 is reset; then, the first scan line S1 changes to provide a high level, that is, the second transistor T2, the third transistor T3 and the sixth transistor T6 are controlled to be turned off, the voltage of the first node N1 is kept unchanged due to the effect of the capacitor C, the emission control line Emit provides a low level, the first transistor T1 and the fifth transistor T5 are controlled to be turned on, the driving transistor Td generates a corresponding driving current under the effect of the voltage of the first node N1, the driving current flows through the corresponding light emitting device DD, so that the light emitting device DD generates a corresponding gray-scale luminance under the control of the data voltage, that is, the scanning of the pixel driving circuit 1 in one row is realized, and by analogy, the dynamic display of the image can be realized by scanning line by line, and the relation between the touch detection process and the touch time period TT in the display process is described in the above embodiment, and will not be repeated herein.
In one possible embodiment, as shown in fig. 12 and 14, the organic light emitting display panel may further include a cathode insulating layer 104, a cathode 105, a pixel defining layer 106, an anode 107, a planarization layer 108, a source-drain metal layer 109, a first interlayer insulating layer 110, a capacitor plate layer 111, a second interlayer insulating layer 112, a gate metal layer 113, a gate insulating layer 114, a semiconductor layer 115, a buffer layer 116, and a substrate 117, which are sequentially stacked from top to bottom, the cathode insulating layer 104 is located between the cathode 105 and the touch control electrode layer 10, wherein an organic light emitting layer 100 is further disposed between the anode 107 and the cathode 105, the pixel defining layer 106 has an opening corresponding to each light emitting device, the organic light emitting layer 100 is located in the corresponding opening, the anode 107, the cathode 105, and the organic light emitting layer 100 constitute one light emitting device, the source-drain metal layer 109 has a source S and a drain D formed, one plate of a capacitor is formed on the capacitor plate layer 111, the other plate of the capacitor and the gate G are formed on the gate metal layer 113, and the semiconductor layer 115 is used as an active layer to form a channel of a transistor.
On the other hand, as shown in fig. 15, an embodiment of the present application further provides a display device including the organic light emitting display panel 200 described above.
The specific structure and principle of the organic light emitting display panel 200 are the same as those of the above embodiments, and are not described herein again. The display device may be any electronic device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, or a television.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (12)
1. An organic light emitting display panel, comprising:
the pixel driving circuit comprises a driving transistor and a capacitor, wherein the control end of the driving transistor is electrically connected to a first node, and the first node is electrically connected to one end of the capacitor;
a first scan line connected to each row of pixel driving circuits, wherein a frame display period includes an i-th scan period corresponding to the i-th row of pixel driving circuits, i has values of 1, 2, 3, …, n, and n is the largest row number of pixel driving circuits, and in the i-th scan period, a first scan signal transmitted by the first scan line corresponding to the i-th row of pixel driving circuits is composed of a charging period corresponding to an active level and a non-charging period corresponding to a non-active level, and the pixel driving circuits are configured to charge the first node having the reference voltage value Vref in response to the active level on the corresponding first scan line;
the touch control electrode is used for transmitting a touch control signal in a plurality of periodic touch control time intervals;
each touch time interval is overlapped with one charging time interval, in each touch time interval and the charging time interval overlapped with the touch time interval, the difference between the starting time of the touch time interval and the starting time of the charging time interval is a, and a is larger than 0.
2. The organic light-emitting display panel according to claim 1,
3. The organic light-emitting display panel according to claim 1,
in each of the touch periods and the charging period overlapping therewith, an end time of the touch period is subsequent to an end time of the charging period.
4. The organic light-emitting display panel according to claim 3,
the end time of the touch time interval is before the end time of the corresponding scanning time interval.
5. The organic light-emitting display panel according to claim 1,
in each of the touch periods and the charging period overlapping therewith, an end time of the touch period is before an end time of the charging period.
6. The organic light-emitting display panel according to claim 5,
in each touch time interval and the charging time interval overlapped with the touch time interval, the difference between the ending time of the charging time interval and the ending time of the touch time interval is b, and b is greater than 0.5 mu s.
7. The organic light-emitting display panel according to claim 1,
at least one scanning time interval is arranged between any two adjacent touch time intervals.
8. The organic light-emitting display panel according to claim 1, further comprising:
the data lines are correspondingly connected with the pixel driving circuits of each row, every m data lines form a data line group, and m is greater than 2;
and the multi-channel gating circuit corresponds to each data line group, comprises an input end and m output ends respectively connected with m data lines, further comprises a data line writing time period before the corresponding charging time period, and is used for enabling the input end and the m output ends to be conducted in a time-sharing mode in the data line writing time period.
9. The organic light-emitting display panel according to claim 1,
the touch control electrodes are mutual capacitance type touch control electrodes, and the mutual capacitance type touch control electrodes comprise a plurality of driving electrodes and a plurality of induction electrodes;
every adjacent n touch time intervals form a touch cycle, n is greater than 2, and the plurality of driving electrodes transmit pulse signals in a time-sharing mode in the n touch time intervals.
10. The organic light-emitting display panel according to claim 1, further comprising:
and the touch unit is used for sampling a touch induction signal on the touch electrode in each touch time interval and determining a touch position according to the touch induction signal.
11. The organic light-emitting display panel according to claim 1,
the pixel driving circuit further includes:
a first transistor, a first end of which is electrically connected to a first power voltage end, a second end of which is electrically connected to a second node, and a control end of which is electrically connected to a corresponding light-emitting control line;
a first end of the second transistor is electrically connected to the corresponding data line, a second end of the second transistor is electrically connected to the second node, and a control end of the second transistor is electrically connected to the corresponding first scan line;
a third transistor, a first end of which is electrically connected to the first node, a second end of which is electrically connected to a third node, and a control end of which is electrically connected to the corresponding first scan line;
a fourth transistor, a first end of which is electrically connected to a reference voltage signal end, a second end of which is electrically connected to the first node, a control end of which is electrically connected to the corresponding second scan line, and the reference voltage signal end is used for providing the reference voltage value Vref;
a fifth transistor, a first end of which is electrically connected to the third node, a second end of which is electrically connected to the fourth node, and a control end of which is electrically connected to the corresponding light-emitting control line;
a first end of the sixth transistor is electrically connected to the reference voltage signal end, a second end of the sixth transistor is electrically connected to the fourth node, and a control end of the sixth transistor is electrically connected to the corresponding first scan line;
a light emitting device, an anode of which is electrically connected to the fourth node, and a cathode of which is electrically connected to a second power supply voltage terminal;
the capacitor is connected in series between the first node and the first power supply voltage end;
the first end of the driving transistor is electrically connected to the second node, and the second end of the driving transistor is electrically connected to the third node.
12. A display device characterized by comprising the organic light-emitting display panel according to any one of claims 1 to 11.
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