KR20190076637A - Organic light emitting display panel and organic light emitting display apparatus using the same - Google Patents

Abstract

An object of the present invention is to provide an organic light emitting display panel and an organic light emitting display device using the same, in which at least two sensing transistors share a shared active layer connected to a sensing line. According to the present invention, the organic light emitting display panel comprises: organic light emitting diodes provided in pixels; pixel drivers provided in the pixels to drive the organic light emitting diodes; sensing lines supplying a sensing voltage to the pixel drivers; and sensing pulse lines supplied with sensing pulses. Each of the pixel drivers includes a driving transistor for controlling a current supplied to the organic light emitting diode, and a sensing transistor for compensating for characteristics of the driving transistor. At least two of the sensing transistors share a shared active layer connected to any one of the sensing lines through a first contact hole, and a portion of the shared active layer overlapping the sensing pulse line is a semiconductor.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting display panel and an organic light emitting display using the organic light emitting display panel.

The present invention relates to an organic light emitting display panel and an organic light emitting display using the same.

An organic light emitting display apparatus uses a self-luminous element and has low power consumption, and thus is widely used as a flat panel display.

FIG. 1 is a plan view of a conventional organic light emitting display panel.

Each of the pixels provided in the organic light emitting display panel may be basically operated with two transistors, one capacitor and an organic light emitting diode (OLED).

As shown in FIG. 1, each of the pixels includes an organic light emitting diode (OLED) and a pixel driving unit (PD) for driving the organic light emitting diode OLED. The pixel driving unit PD includes a driving transistor Tdr and a switching transistor Tswl.

However, in order to shape the image uniformity and reliability of the organic light emitting display device, the pixel driving unit PD constituting the pixel of the organic light emitting display device may further include a compensation circuit including at least one transistor.

For example, the compensation circuit may be composed of the sensing transistor Tsw2, as shown in Fig. The sensing transistor Tsw2 is connected between a sensing line SL for supplying a reference voltage or a sensing voltage and the driving transistor Tdr.

Each of the sensing transistors Tsw2 included in the pixels includes a bridge line 11 connected to the sensing line SL through a first contact hole CH1, a bridge line 11 connected to the bridge line 11, An active layer 12 connected through a hole CH2 and a sensing pulse line SPL overlapping the active layer 12 with an insulating film interposed therebetween.

Therefore, the conventional organic light emitting display panel must include the second contact holes CH2 as many as the number of the sensing transistors Tsw2. In addition, the conventional organic light emitting display panel must include the bridge line 11 in order to connect the sensing line SL to the active layers 12.

Accordingly, the conventional organic light emitting display panel must have a space for forming the second contact holes CH2 and a space for forming the bridge line 11. [ This makes it difficult to change the design of the organic light emitting display panel and increases the area of the pixel driving unit to reduce the area of the organic light emitting diode OLED. When the area of the organic light emitting diode (OLED) is reduced, the brightness of the organic light emitting diode can be reduced, thereby reducing the brightness of the organic light emitting display.

SUMMARY OF THE INVENTION An object of the present invention, which is proposed to solve the above-mentioned problems, is to provide an OLED display panel in which at least two sensing transistors share a shared active layer connected to a sensing line, and an OLED display using the same will be.

According to an aspect of the present invention, there is provided an OLED display panel including organic light emitting diodes (OLEDs) included in pixels, pixel drivers provided in the pixels to drive the organic light emitting diodes, And a sensing pulse line to which a sensing pulse is supplied. Each of the pixel driver units includes a driving transistor for controlling a current supplied to the organic light emitting diode and a sensing transistor for compensating a characteristic of the driving transistor. Wherein at least two sensing transistors share a shared active layer connected to one of the sensing lines through a first contact hole and a portion of the shared active layer overlapping the sensing pulse line is a semiconductor to be.

According to an aspect of the present invention, there is provided an organic light emitting diode (OLED) display panel, a gate driver for supplying gate pulses to gate lines of the OLED display panel, A data driver for supplying a data voltage to data lines provided in the data driver, and a controller for controlling the gate driver and the data driver.

According to the present invention, a sensing line to which a sensing voltage for compensating a driving transistor is supplied is connected to a shared active layer, and the shared active layer is used for compensating the driving transistors included in at least two pixels , Is used as the active layer of each of the at least two switching transistors.

Therefore, the area of the pixel driver applied to the organic light emitting display panel according to the present invention can be reduced as compared with the conventional organic light emitting display panel. As the area of the pixel driver is reduced, the area of the organic light emitting diode can be increased, which can increase the brightness of the organic light emitting display panel.

In addition, according to the present invention, a free space may be generated in the pixel driving unit as compared with the conventional case, and the design of the pixel driving unit can be freely changed by the free space. In addition, new components for performing various functions may be added to the free space.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exemplary view showing a plane of a conventional organic light emitting display panel. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
FIG. 3 is a view illustrating two adjacent pixels included in the OLED display panel according to an embodiment of the present invention. Referring to FIG.
4 is a view showing a plane of four pixels of an organic light emitting display panel according to the present invention.
5 is a cross-sectional view of a sensing transistor applied to an organic light emitting display panel according to the present invention.
6 is a cross-sectional view taken along the line A-A 'shown in FIG. 4;
FIG. 7 is an exemplary diagram schematically showing the relationship between a shared active layer and a sensing pulse line applied to the embodiment shown in FIG. 4; FIG.
8 to 11 are views illustrating various structures of a shared active layer applied to an organic light emitting display panel according to the present invention.
12 is a view for explaining an increase in the area of an organic light emitting diode in an organic light emitting display panel according to the present invention.
FIGS. 13A and 13B are views for explaining why the amount of current flowing to the sensing transistor applied to the organic light emitting display panel according to the present invention is increased. FIG.
FIGS. 14A and 14B are graphs illustrating a graph of an amount of a current flowing to a sensing transistor applied to an organic light emitting display panel according to the present invention. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of the invention to a person skilled in the art, and the invention is only defined by the scope of the claims.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The term " at least one " should be understood to include all possible combinations from one or more related items. For example, the meaning of 'at least one of the first item, the second item and the third item' means not only the first item, the second item or the third item, but also the second item, the second item and the third item, Means any combination of items that can be presented from more than one.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view illustrating the structure of an organic light emitting display according to an embodiment of the present invention. FIG. 3 is a diagram illustrating two neighboring pixels included in the organic light emitting display panel according to an exemplary embodiment of the present invention.

2, the organic light emitting display according to the present invention includes pixels 110 defined by gate lines GL1 to GLg and data lines DL1 to DLd, A gate driver 200 for sequentially supplying gate pulses to the gate lines GL1 to GLg provided in the organic light emitting display panel 100, A data driver 300 for supplying a data voltage to the data lines DL1 to DLd provided in the display panel 100 and a control unit 400 for controlling the gate driver 200 and the data driver 300 .

The structure and functions of the organic light emitting display panel 100 are as follows.

The organic light emitting diode display panel 100 includes the gate lines GL1 to GLg to which gate pulses are supplied, the data lines DL1 to DLd and the gate lines GL1 to GLg to which data voltages are supplied, And pixels 110 defined by data lines Dl1 to DLd, and each of the pixels 110 is provided with at least two thin film transistors (hereinafter simply referred to as transistors).

3, each of the pixels 110 included in the organic light emitting display panel 100 includes an organic light emitting diode (OLED) for outputting light and a pixel (not shown) for driving the organic light emitting diode (OLED) And a driving unit PD.

Each of the pixels 110 is formed with signal lines DL, GL, PLA, PLB, SL and SPL for supplying a driving signal to the pixel driver PD.

A data voltage Vdata is supplied to the data line DL, a gate pulse GP is supplied to the gate line GL, and a first driving voltage EVDD is applied to the first voltage supply line PLA. A second driving voltage EVSS is supplied to the second voltage supply line PLB and a sensing voltage Vini is supplied to the sensing line SL. A sensing pulse SP for turning on or off the sensing transistor Tsw2 is supplied. The first driving voltage is supplied from the first driving voltage supply unit, and the second driving voltage is supplied from the second driving voltage supply unit.

The pixel driving unit PD includes a switching transistor Tsw1 connected to the gate line GL and the data line DL as shown in FIG. 3, data transmitted through the switching transistor Tsw1, A driving transistor Tdr for controlling a magnitude of a current output to the organic light emitting diode OLED according to a voltage Vdata and the sensing transistor Tsw2 for sensing a characteristic of the driving transistor Tdr . The sensing transistor Tsw2 may be a compensation circuit, and the compensation circuit may further include another transistor and a capacitor other than the sensing transistor Tsw2. In addition to the components described above, the pixel driver PD may further include an emission transistor for controlling the light emission timing of the driving transistor Tdr and transistors for other purposes.

A storage capacitor Cst is formed between the gate of the driving transistor Tdr and the anode of the organic light emitting diode OLED.

The switching transistor Tsw1 is turned on by a gate pulse supplied to the gate line GL and transmits the data voltage Vdata supplied to the data line DL to the gate of the driving transistor Tdr.

The sensing transistor Tsw2 is connected to the first node n1 and the sensing line SL between the driving transistor Tdr and the organic light emitting diode OLED and is turned on or off by the sensing pulse SP, And senses the characteristics of the driving transistor during a sensing period. 3, the sensing transistor Tsw2 may be connected to the sensing line SL in a one-to-one manner. However, as shown in FIG. 3, One sensing transistor Tsw2 may share one sensing line SL. In addition, for example, when red pixels, green pixels, blue pixels, and white pixels constitute unit pixels, the four sensing transistors Tsw2 included in one unit pixel are connected to one sensing line (SL).

The method of controlling the magnitude of the current supplied from the driving transistor Tdr to the organic light emitting diode OLED according to the characteristic change of the driving transistor Tdr may be classified into an internal compensation method and an external compensation method . The internal compensation method compensates for a change in the characteristics of the driving transistor by using a compensation circuit including the sensing transistor so that a normal current according to the data voltage (Vdata) supplied to the gate of the driving transistor (Tdr) (OLED). The external compensation method may vary the magnitude of the data voltage supplied to the gate of the driving transistor by sensing a change in the characteristics of the driving transistor Tdr.

During the sensing period in which the internal compensation method or the external compensation method is performed, the sensing voltage Vini is supplied through the sensing line SL. The sensing voltage Vini may be an initialization voltage for initializing the driving transistor or a reference voltage supplied to the driving transistor.

When the sensing voltage Vini is supplied, a pixel having one of the at least two sensing transistors connected to the sensing line SL, for example, the first pixel P1, A voltage Vdata may be supplied so that a change in the characteristics of the driving transistor included in the first pixel P1 can be detected.

That is, while the sensing voltage is supplied to the sensing line SL, a change in the characteristics of the driving transistor Tdr included in one of the pixels commonly connected to the sensing line SL is detected .

The second node n2 connected to the gate of the driving transistor Tdr is connected to the switching transistor Tsw1. The storage capacitor Cst is formed between the second node n2 and the first node n1.

In addition to the structure shown in FIG. 3, the pixel driver PD may further include transistors and capacitors, and may have a variety of structures.

The transistors included in the pixel driver PD may be at least one of an oxide thin film transistor, an amorphous silicon thin film transistor, a polysilicon thin film transistor, and a low temperature polysilicon thin film transistor.

The specific structure of the organic light emitting display panel 100 according to the present invention will be described in detail below with reference to FIGS. 4 to 11. FIG.

The function of the controller 400 is as follows.

The controller 400 controls a gate control signal GCS for controlling the gate driver 200 using a timing signal supplied from an external system, for example, a vertical synchronization signal, a horizontal synchronization signal, And outputs a data control signal DCS for controlling the data driver 300. The controller 400 rearranges the input image data input from the external system and supplies the rearranged digital image data Data to the data driver 300.

The functions of the data driver 300 are as follows.

The data driver 300 converts the image data Data input from the controller 400 into an analog data voltage and supplies the analog data voltage to the gate line GL every 1 horizontal period And transmits the data voltages Vdata of the horizontal lines to the data lines DL1 to DLd.

The function of the gate driver 200 is as follows.

The gate driver 200 sequentially supplies gate pulses to the gate lines GL1 to GLg of the OLED display panel 100 in response to the gate control signal GCS input from the controller 400. [ do. Accordingly, the switching transistors formed in the respective pixels to which the gate pulse is input are turned on, so that an image can be output to each pixel 110. The gate driver 200 may be formed independently from the organic light emitting display panel 100 and may be electrically connected to the organic light emitting display panel 100 in various ways, And may be configured by a gate-in-panel (GIP) method in which the panel 100 is mounted.

In the above description, the data driver 300, the gate driver 200, and the controller 400 are independently configured. However, at least one of the data driver 300 and the gate driver 200 And may be integrally formed with the controller 400.

4 is a view illustrating a plane of four pixels of the organic light emitting display panel according to the present invention, FIG. 5 is a cross-sectional view of a sensing transistor applied to the organic light emitting display panel according to the present invention, 4 is a cross-sectional view taken along line A-A 'of FIG. 4, and FIG. 7 is a schematic view illustrating a relationship between a shared active layer and a sensing pulse line applied to the embodiment shown in FIG. 4 .

The organic light emitting diode display panel 100 according to the present invention includes organic light emitting diodes (OLEDs) included in the pixels 110, a plurality of organic light emitting diodes (OLEDs) And a sensing line SL for supplying a sensing voltage Vini to the pixel driver PDs. 3, the OLED display panel 100 includes a data line DL to which a data voltage Vdata is supplied, a first data line DL to which the first driving voltage EVDD is supplied, A first voltage supply line PLA, a gate line GL to which a gate pulse is supplied, and a sensing pulse line SPL to which a sensing pulse is supplied.

Each of the pixel driving parts PD includes a driving transistor Tdr for controlling the current supplied to the organic light emitting diode OLED, a sensing transistor Tsw2 for compensating the characteristic of the driving transistor Tdr, And a switching transistor Tsw1 which is turned on by a gate pulse supplied to the line GL and transfers the data voltage Vdata supplied to the data line DL to the gate of the driving transistor Tdr.

2 and 3, description will be made of the sensing transistor Tsw2 and the sensing line SL in the following description, except for the connection structure between the sensing transistor Tsw2 and the sensing line SL among the above- The connection structure with the line SL will be described in detail.

The pixel driving part PD provided in each pixel is provided with the sensing transistor Tsw2.

4, at least two sensing transistors Tsw2 among the sensing transistors Tsw2 provided in the organic light emitting display panel 100 are connected to one of the sensing lines SL, And shares the shared active layer 150 connected through the first contact hole H1 with the sensing line.

For example, in the organic light emitting display panel 100 shown in FIG. 4, four pixels, i.e., a red pixel R, a green pixel G, a blue pixel B, and a white pixel W The four sensing transistors Tsw2 provided share one common active layer 150.

The shared active layer 150 is connected to the sensing line SL provided between the green pixel G and the blue pixel B through the first contact hole H1.

A portion of the shared active layer 150 overlapping the sensing pulse line SPL is a semiconductor, and a portion not overlapping the sensing pulse line SPL is a conductor. For example, the semiconductor may be any one of an oxide semiconductor, amorphous silicon, polysilicon, and low-temperature polysilicon.

As shown in FIGS. 4 and 5, the sensing transistor Tsw2 includes a first terminal T1 to which a first voltage is supplied, a second terminal T2 to which a second voltage is supplied, The active layer T3 and the gate insulating film T5 which are provided between the first terminal T1 and the second terminal T2 and connect the first terminal T1 and the second terminal T2, T1 and the second terminal T2 and the gate T4 insulated from the active layer T3.

FIG. 5 schematically shows the structure of the sensing transistor Tsw2. 5, the first terminal T1, the second terminal T2, and the active layer T3 constituting the sensing transistor Tsw2 are provided on the substrate 101 so as to be electrically And the gate insulating film T5 is provided on the upper ends of the first terminal T1 and the second terminal T2 and the active layer T3 and on the upper end of the gate insulating film T5, (T4). The first terminal T1, the second terminal T2, the active layer T3, the gate insulating film T5 and the gate T4 are covered with an insulating film 103. [

The first terminal T1 is connected to the sensing line SL through the first contact hole H1 and is not overlapped with the sensing pulse line SPL. The first terminal T1 is a metal line and the first voltage, i.e., the sensing voltage Vini, is supplied through the first terminal T1.

The second terminal T2 is connected to the driving transistor Tdr and the organic light emitting diode OLED and is not overlapped with the sensing pulse line SPL. The second terminal T2 is a metal line. When the driving transistor Tdr is of the N type, the second voltage, that is, the drain voltage of the driving transistor Tdr, is supplied through the second terminal T2.

The active layer T3 is a portion of the shared active layer 150 overlapping the sensing pulse line SPL. As described above, the active layer T3 is a semiconductor.

The gate T4 is the sensing pulse line SPL. Therefore, the gate T4 is a metal line, and the sensing pulse is supplied to the gate T4.

The sensing pulse line SPL comprising the gate T4 constituting the sensing transistor Tsw2 is superimposed on at least one shared active layer 150 along at least one shared active layer 150 have. For example, in FIG. 4, one shared active layer 150 shared by four sensing transistors Tsw2 and the sensing pulse line SPL superimposed along one shared active layer 150 Respectively.

However, one horizontal line of the organic light emitting display panel 100 according to the present invention is provided with 1000 or more pixels, and thus the shared active layer 150 sharing the sensing transistors Tsw2 included in the four pixels, May be several hundreds or more. For example, FIG. 7 illustrates two adjacent shared active layers 150 among hundreds of the shared active layers 150, in which case the sensing pulse line SPL includes two Are overlapped along the shared active layers 150.

Since the sensing pulse line SPL overlaps with the shared active layer 150, the application space of the pixel driver PD can be increased.

In this case, each of the two shared active layers 150 is connected to a different sensing line SL through the first contact hole H1.

6, the sensing line SL may be provided on the substrate 101, and the sensing line SL may be formed on the substrate 101. In this case, The active layer T3 and the sensing line SL are covered by the buffer 102 and electrically connected to the buffer 102 via the first contact hole H1, Can be connected.

5, the first terminal T1 is also extended along the sensing pulse line SPL, and the first contact hole H1 (not shown in the figure) And may be electrically connected to the sensing line SL.

A portion of the active layer T3 and the first terminal T1 may form one line and the line may be arranged in parallel with the sensing pulse line SPL, Line may be electrically connected to the sensing line SL through the first contact hole H1.

The active layer T3 is covered with the gate insulating layer T5 and the gate T4 or the sensing pulse line SPL is provided on the gate insulating layer T5. And is covered with an insulating film 103.

The data lines DL may be formed on the top of the insulating layer 103 and the data lines DL may be covered with another insulating layer and a flat layer.

The structure of the shared active layer 150 will be described in detail as follows.

4 and 7, the shared active layer 150 extends along at least two pixels adjacent to each other, and the sensing line SL is formed through the first contact hole H1, And at least two protrusions 152 protruding from the shared line 151 toward the driving transistor Tdr included in at least two of the pixels. The protrusions 152 are connected to the driving transistor Tdr and the organic light emitting diode OLED.

A portion of the shared line 151 overlaps the sensing pulse line SPL and a portion of each of the protruding portions 152 overlaps the sensing pulse line SPL.

The portion of the shared line 151 overlapped with the sensing pulse line SPL and the portion of the sensing line 152 overlapping the sensing pulse line SPL is a semiconductor.

A part of the common line 151 excluding the part overlapped with the sensing pulse line SPL and a part of the projection 152 excluding the part overlapping the sensing pulse line SPL, to be.

Particularly, a portion of the shared line 151 excluding the portion overlapped with the sensing pulse line SPL is the first terminal T1, and the sensing pulse line SPL of each of the protruding portions 152, (SPL) of the shared line (151), and the part of the shared line (151) overlapping the sensing pulse line (SPL) The portion overlapping with the pulse line SPL is the active layer T3.

When the shared active layer 150 is shared by at least four sensing transistors Tsw2, the shared active layer 150 is provided with at least two or more first contact holes H1, The shared active layer 150 may be connected to at least two sensing lines SL through at least two of the first contact holes H1. In this case, at least two of the sensing lines SL are electrically connected to each other.

For example, each of the two shared active layers 150 shown in FIG. 7 is connected to one sensing line SL through one first contact hole H1.

However, one shared active layer 150 may be provided with two or more first contact holes H1, and one shared active layer 150 may be formed through two or more first contact holes H1 And may be connected to at least two sensing lines (SL).

In this case, since one signal must be transmitted to at least two of the sensing lines SL, at least two of the sensing lines SL are formed in a specific region in the organic light emitting display panel 100, for example, And can be electrically connected to each other in a non-display area where pixels are not provided. Further, at least two of the sensing lines SL may be electrically connected to each other in a specific region between the pixels.

Since the current can be supplied to the sensing transistor Tsw2 through at least two of the sensing lines SL, the amount of current supplied to the sensing transistor Tsw2 can be increased, Tsw2 can be improved. Thus, the performance of the sensing transistor Tsw2 can be improved.

8 to 11 are views showing various structures of the shared active layer applied to the organic light emitting display panel according to the present invention.

First, FIG. 8 shows the structure of a shared active layer 150 and a sensing pulse line (SPL) shared by two adjacent pixels as shown in FIG.

Since the shared active layer 150 is shared by the two pixels, the shared active layer 150 is connected to the two driving transistors Tdr included in the two pixels 110 Two protrusions 152 project from one shared line 151.

Next, FIG. 9 shows the structure of the shared active layer 150 and the sensing pulse line (SPL) shared by three pixels.

Since the shared active layer 150 is shared by three pixels, the shared active layer 150 is connected to the three driving transistors Tdr included in the three pixels 110 Three protrusions 152 protrude from one shared line 151.

Next, FIG. 10 shows the structure of a shared active layer 150 and a sensing pulse line (SPL) shared by eight pixels.

Here, since the shared active layer 150 is shared by eight pixels, the shared active layer 150 is connected to the eight driving transistors Tdr included in the eight pixels 110 Eight protrusions 152 protrude from one shared line 151.

The shared active layer 150 shown in FIGS. 8 to 10 has at least two first contact holes H1 connected to at least two sensing lines SL electrically connected to each other . The same signal is transmitted to at least two of the sensing lines SL.

11 illustrates a structure of a shared active layer 150 and a sensing pulse line SPL shared by all the pixels included in one horizontal line of the OLED display panel 100. Referring to FIG.

Here, since the shared active layer 150 is shared by all the pixels included in one horizontal line, the shared active layer 150 includes a number of pixels corresponding to the number of all pixels included in one horizontal line Projections 152 project from one shared line 151.

In this case, one shared active layer 150 may include at least two first contact holes H1 connected to at least two sensing lines SL electrically connected to each other. The same signal is transmitted to at least two of the sensing lines SL.

When one shared active layer 150 is connected to at least two sensing lines through at least two of the first contact holes H1, a signal sensed from one sensing transistor Tsw2 or a signal The load of the signal supplied to the sensing signal can be reduced.

With the above-described various structures, the number of sensing lines SL can be reduced, so that the organic light emitting display panels having various structures can be designed.

12 is a view for explaining the reason why the area of the organic light emitting diode is increased in the organic light emitting display panel according to the present invention. 12 (a) is an exemplary view showing a plane of four pixels of a conventional organic light emitting display panel, in particular, a plane shown in FIG. 1. 12 (b) is an exemplary view showing a plane of four pixels of the organic light emitting display panel according to the present invention, and particularly shows a plane shown in FIG. 4. FIG. Therefore, a detailed description of Figs. 12A and 12B is omitted. Further, in the plan view shown in Figs. 12A and 12B, assuming that the width of each pixel is the same, the height of each pixel is X1.

In this case, in the conventional organic light emitting display panel shown in FIG. 3A, four active layers 12 are connected to one bridge 11 through second contact holes CH2, Each forming the sensing transistor Tsw2 of each of the four pixels.

However, in the organic light emitting display panel according to the present invention shown in (b), as described above, the conventional bridge 11 is removed, and the shared active layer 150 is directly connected to four pixels 110, Each of the sensing transistors Tsw2 is formed.

Therefore, in the organic light emitting display panel according to the present invention, the space provided for the bridge 11 and the second contact holes CH2 provided in the conventional organic light emitting display panel can be omitted, The organic light emitting display panel according to the present invention may have a clearance of Y corresponding to the height of the conventional organic light emitting display panel shown in FIG.

Therefore, in the organic light emitting display panel according to the present invention, the organic light emitting diode (OLED) may be further formed in the clearance corresponding to the height Y as shown in (b).

Accordingly, the organic light emitting diode (OLED) of the organic light emitting display panel according to the present invention may be larger in height than the organic light emitting diode of the conventional organic light emitting display panel.

As a result of simulation and measurement, the area of the organic light emitting diode (OLED) included in the organic light emitting display panel according to the present invention is 8% to 9% of the area of the organic light emitting diode (OLED) It was confirmed that it was getting bigger.

This means that according to the present invention, the aperture ratio of the organic light emitting display panel can be increased. As a result of the simulation and measurement, it was confirmed that the aperture ratio of the organic light emitting display panel according to the present invention is increased by about 2.4% compared to the conventional case when the aperture ratio of the conventional organic light emitting display panel is about 30%.

FIGS. 13A and 13B are views for explaining the reason why the amount of current flowing to the sensing transistor applied to the organic light emitting display panel according to the present invention is increased. FIG. 14A and FIG. And the amount of current flowing to the sensing transistor applied to the sensing transistor is measured. Here, FIG. 13A is an illustration showing three sensing transistors of a conventional organic light emitting display panel, in particular, the sensing transistors Tsw2 included in the conventional organic light emitting display panel shown in FIG. FIG. 13B is a view showing three sensing transistors of the organic light emitting display panel according to the present invention. In particular, FIG. 13B shows sensing transistors Tsw2 provided in the organic light emitting display panel according to the present invention shown in FIG. 13A and 13B are not described in detail. 14A is a diagram showing the relationship between the voltage VGS between the gate and the source of the sensing transistor Tsw2 and the voltage VGS between the source and the source of the sensing transistor Tsw2 when the voltage VDS between the drain and the source of the sensing transistor Tsw2 is 10V. 14B shows a change in the magnitude of the current IDS flowing through the drain and the source of the transistor Tsw2. FIG. 14B shows a change in the magnitude of the current IDS flowing through the source and drain of the sensing transistor Tsw2, particularly when the voltage VDS between the drain and the source of the sensing transistor Tsw2 is 0.1V. (IDS) flowing through the drain and the source of the sensing transistor Tsw2 as the voltage VGS between the gate and the source of the sensing transistor Tsw2 is changed. 14A and 14B, the dotted line indicates the change in the conventional sensing transistor, and the solid line indicates the change in the sensing transistor Tsw2 applied to the present invention.

13A, in the conventional organic light emitting display panel, for example, three active layers 12 connected to one bridge 11 are superimposed on one sensing pulse line (SPL) , Three sensing transistors Tsw2 are formed.

In this case, the portion of each sensing transistor Tsw2 where the sensing pulse line SPL overlaps with the active layer 12 is a semiconductor, and the non-overlapping portion is formed by a conductor.

Therefore, in each of the sensing transistors Tsw2, there is only one path through which a current can flow, as shown in FIG. 13A. For example, the current flows through only one path connected to the source through a portion formed from the semiconductor to the drain formed from the conductor, as shown in Fig. 13A.

However, in the OLED display panel according to the present invention as shown in FIG. 13B, for example, three protrusions 152 connected to one common line 151 are overlapped on one sensing pulse line (SPL) So that three sensing transistors Tsw2 are formed.

In this case, the portion of each sensing transistor Tsw2 where the sensing pulse line SPL overlaps with the shared line 151 and the protruding portion 152 is a semiconductor, and the non-overlapping portion is formed by a conductor.

Particularly, as shown in FIG. 13B, the shared line 151 includes a portion overlapping the sensing pulse line SPL and a portion not overlapping the sensing pulse line SPL. Therefore, in the shared line 151, There is a portion formed by the portion and the conductor.

Therefore, in each of the sensing transistors Tsw2, there may be two paths through which a current can flow, as shown in FIG. 13B. For example, the current flows from the drain formed by the conductor of the protrusion 152 to the conductor of the shared line 151 through the portion formed of the semiconductor between the shared line 151 and the protrusion 152 Through a portion formed of a semiconductor between the shared line 151 and the protruding portion 152 from a first path connected to the formed portion and a drain formed by the conductor of the protruding portion 152, 151 are connected to each other through a second path.

Here, the first path may correspond to the path shown in FIG. 13 (a). Therefore, the sensing transistor Tsw2 applied to the present invention is further provided with the second path as compared with the conventional sensing transistor.

Accordingly, in the sensing transistor Tsw2 according to the present invention, more current can flow as compared with the conventional sensing transistor.

As shown in FIGS. 14A and 14B, the current (IDS) flowing between the drain and the source in the sensing transistor Tsw2 applied to the present invention is the difference between the drain and the source in the conventional sensing transistor It was confirmed that the current was larger than the current (IDS).

For example, in FIGS. 14A and 14B, when the voltage VGS between the gate and the source is approximately 20 V, the current (IDS) flowing between the drain and the source in the sensing transistor Tsw2 applied to the present invention It has been confirmed that the size is increased by about 25% from the size of the current (IDS) flowing between the drain and the source in the conventional sensing transistor.

When the current flowing to the sensing transistor Tsw2 is increased, the performance of the sensing transistor Tsw2, for example, the switching speed, can be improved as described above with reference to FIGS.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Panel 110: Pixel
200: gate driver 300: data driver
400:

Claims (18)

Organic light emitting diodes included in the pixels;
Pixel driving units provided in the pixels for driving the organic light emitting diodes;
Sensing lines for supplying a sensing voltage to the pixel drivers; And
Sensing pulse lines to which a sensing pulse is supplied,
Each of the pixel drivers includes:
A driving transistor for controlling a current supplied to the organic light emitting diode; And
And a sensing transistor for compensating a characteristic of the driving transistor,
At least two of said sensing transistors share a shared active layer that is connected through a first contact hole to one of said sensing lines,
Wherein a portion of the shared active layer overlapping the sensing pulse line is a semiconductor. The method according to claim 1,
The sensing transistor includes:
A first terminal to which a first voltage is supplied;
A second terminal to which a second voltage is supplied;
An active layer provided between the first terminal and the second terminal to connect the first terminal and the second terminal; And
And a gate insulated from the first terminal, the second terminal and the active layer by a gate insulating film,
Wherein the first terminal is connected to the sensing line, the second terminal is connected to the driving transistor and the organic light emitting diode, the active layer overlaps with the sensing pulse line,
Wherein the first terminal, the second terminal, and the active layer form the shared active layer. 3. The method of claim 2,
Wherein the sensing pulse line including the gate overlaps at least one shared active layer along at least one shared active layer. The method according to claim 1,
Wherein the shared active layer comprises:
A shared line extending along at least two pixels adjacent to each other and connected to the sensing line through the first contact hole; And
And at least two protrusions protruding from the shared line toward the driving transistors included in at least two of the pixels. 5. The method of claim 4,
A portion of the shared lines overlapping the sensing pulse line,
And a portion of each of the protrusions overlaps with the sensing pulse line. 6. The method of claim 5,
The portion of the shared line overlapping the sensing pulse line and the portion of each of the protruding portions overlapping the sensing pulse line are semiconductor,
Wherein a part of the common line excluding the part overlapped with the sensing pulse line and a part of the projection excluding the part overlapped with the sensing pulse line are metal. 6. The method of claim 5,
The sensing transistor includes:
A first terminal to which a first voltage is supplied;
A second terminal to which a second voltage is supplied;
An active layer provided between the first terminal and the second terminal to connect the first terminal and the second terminal; And
And a gate insulated from the first terminal, the second terminal and the active layer by a gate insulating film,
Wherein the first terminal is connected to the sensing line and the second terminal is connected to the driving transistor and the organic light emitting diode, the active layer is a semiconductor, and the active layer is an organic light emitting Display panel. 8. The method of claim 7,
A portion of the shared line excluding the portion overlapping the sensing pulse line is the first terminal,
A portion of each of the protrusions excluding the portion overlapping the sensing pulse line is the second terminal,
Wherein the portion overlapping the sensing pulse line among the shared lines and the portion overlapping the sensing pulse line among the protrusions are the active layer. The method according to claim 1,
Wherein when the shared active layer is shared by at least four or more sensing transistors, the shared active layer is provided with at least two or more of the first contact holes, and the shared active layer comprises at least two electrically connected And the sensing lines are connected to at least two of the first contact holes. An organic light emitting display panel according to claim 1;
A gate driver for supplying gate pulses to the gate lines of the OLED display panel;
A data driver for supplying a data voltage to data lines provided in the organic light emitting display panel; And
And a control unit controlling the gate driver and the data driver. 11. The method of claim 10,
The sensing transistor includes:
A first terminal to which a first voltage is supplied;
A second terminal to which a second voltage is supplied;
An active layer provided between the first terminal and the second terminal to connect the first terminal and the second terminal; And
And a gate insulated from the first terminal, the second terminal and the active layer by a gate insulating film,
The first terminal is connected to the sensing line, the second terminal is connected to the driving transistor and the organic light emitting diode, and the active layer overlaps with the sensing pulse line,
Wherein the first terminal, the second terminal, and the active layer are formed on the organic light emitting display device 12. The method of claim 11,
Wherein the sensing pulse line including the gate overlaps at least one shared active layer along at least one shared active layer. 11. The method of claim 10,
The shared active layer extending along at least two pixels adjacent to each other, the shared line being connected to the sensing line through the first contact hole; And
And at least two protrusions protruding from the shared line toward the driving transistors included in at least two of the pixels. 14. The method of claim 13,
A portion of the shared lines overlapping the sensing pulse line,
And a portion of each of the protrusions overlaps the sensing pulse line. 15. The method of claim 14,
Wherein the portion of the shared line overlapped with the sensing pulse line and the portion of the sensing line overlapped with the sensing pulse line are semiconductors, and the portion of the shared line, which overlaps the sensing pulse line, And a portion of each of the protrusions except the portion overlapping the sensing pulse line is a metal. 15. The method of claim 14,
The sensing transistor includes:
A first terminal to which a first voltage is supplied;
A second terminal to which a second voltage is supplied;
An active layer provided between the first terminal and the second terminal to connect the first terminal and the second terminal; And
And a gate insulated from the first terminal, the second terminal and the active layer by a gate insulating film,
Wherein the first terminal is connected to the sensing line, the second terminal is connected to the driving transistor and the organic light emitting diode, and the active layer is a semiconductor and overlapped with the sensing pulse line. 17. The method of claim 16,
A portion of the shared line excluding the portion overlapping the sensing pulse line is the first terminal,
A portion of each of the protrusions excluding the portion overlapping the sensing pulse line is the second terminal,
Wherein the portion of the common line overlapped with the sensing pulse line and the portion of the sensing line overlapping the sensing pulse line are the active layer. 11. The method of claim 10,
Wherein when the shared active layer is shared by at least four or more sensing transistors, the shared active layer is provided with at least two or more of the first contact holes, and the shared active layer comprises at least two electrically connected And the sensing lines are connected to at least two of the first contact holes.

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