KR20220015731A - Light emitting display apparatus - Google Patents

Abstract

An objective of the present invention is to provide a light emitting display device in which a cathode electrode can perform a function of a touch electrode. According to the present invention, the light emitting display device comprises: a substrate; a first electrode provided in each of pixels provided on the substrate; a light emitting layer provided on the first electrode; and a second electrode provided on the light emitting layer. The second electrode is patterned to cover two or more pixels.

Description

Light-emitting display device {LIGHT EMITTING DISPLAY APPARATUS}

The present invention relates to a light emitting display device.

When the touch panel is applied to the light emitting display panel, the touch panel is provided on the bottom surface of the base substrate of the light emitting display panel or on the upper surface of the encapsulation film of the light emitting display panel.

When the touch panel is provided on the bottom surface of the base substrate, touch performance is reduced due to parasitic capacitance between the light emitting layer provided on the light emitting display panel and the touch electrode, and image quality is deteriorated. In addition, in order to prevent such parasitic capacitance, a shielding layer is provided on the light emitting display panel, and accordingly, the thickness of the light emitting display panel increases.

When the touch panel is provided on the top surface of the encapsulation film, since an additional process for attaching the touch panel is required, the manufacturing procedure becomes complicated and the manufacturing cost increases.

SUMMARY OF THE INVENTION An object of the present invention, which has been proposed to solve the above-described problems, is to provide a light emitting display device in which a cathode electrode can function as a touch electrode.

According to an aspect of the present invention, there is provided a light emitting display device for achieving the above technical problem, a first electrode provided on each of the pixels provided on the substrate, a light emitting layer provided on the first electrode, and a second light emitting layer provided on the light emitting layer an electrode, wherein the second electrode is patterned to cover two or more pixels.

According to the present invention, since the cathode electrode can also be used as a touch electrode, the presence or absence of a touch can be sensed even if a separate touch panel is not provided, and an additional process and mask for generating the touch electrode are not required.

According to the present invention, since a touch can be detected during a period in which black image data is output, image quality can be maintained, a period for image output is not reduced, and touch sensitivity can be maintained constant.

1 is an exemplary view showing the configuration of a light emitting display device according to the present invention.
2 is an exemplary view showing the structure of a pixel applied to a light emitting display device according to the present invention.
3 is an exemplary view showing the structure of a control unit applied to a light emitting display device according to the present invention.
4 is a plan view of a light emitting display panel applied to a light emitting display device according to the present invention, and in particular, an exemplary view showing the Y region shown in FIG. 1 .
5 is another plan view of a light emitting display panel applied to a light emitting display device according to the present invention, and in particular, another exemplary view showing the Y region shown in FIG. 1 .
6 is an exemplary view showing a cross-section taken along line A-A' shown in FIG.
7 is an exemplary view for explaining a method of driving a light emitting display device according to the present invention.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

In the present specification, it should be noted that, in adding reference numbers to the components of each drawing, the same numbers are provided to the same components as possible even though they are indicated on different drawings.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal relationship is described with 'after', 'following', 'after', 'before', etc. It may include cases that are not continuous unless this is used.

The term 'at least one' should be understood to include all possible combinations of 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 respectively, but also two of the first item, the second item and the third item. It means a combination of all items that can be presented from more than one.

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

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each embodiment may be independently implemented with respect to each other or implemented together in a related relationship. may be

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

1 is an exemplary view showing the configuration of a light emitting display device according to the present invention, FIG. 2 is an exemplary view showing the structure of a pixel applied to a light emitting display device according to the present invention, and FIG. 3 is a light emitting display device according to the present invention It is an exemplary diagram showing the structure of the control unit applied to.

The light emitting display device according to the present invention can constitute various electronic devices. The electronic device may be, for example, a smartphone, a tablet PC, a TV, or a monitor.

As shown in FIG. 1, the light emitting display device according to the present invention includes a light emitting display panel 100 provided with pixels 110 for displaying an image, and data lines DL1 to DLd provided on the light emitting display panel. The data driver 300 supplying data voltages Vdata, the gate driver 200 supplying gate voltages to the gate lines GL1 to GLg provided in the light emitting display panel 100, and the light emitting display panel during the image output period The touch driver 600 and the data driver 300 supply the cathode voltage CV to the second electrodes 510 provided in the ) and a control unit 400 for controlling the gate driver 200 and the touch driver 600 .

First, the light emitting display panel 100 includes a display area 120 and a non-display area 130 . The display area 120 includes gate lines GL1 to GLg, data lines DL1 to DLd, and pixels 110 . An image is output in the display area 120 . The non-display area 130 surrounds the display area 120 , and no image is output in the non-display area 130 .

The pixel 110 provided in the light emitting display panel 100 includes, for example, as shown in FIG. 2 , a light emitting device ED, a switching transistor Tsw1, a storage capacitor Cst, and a driving transistor Tdr. and a sensing transistor Tsw2. That is, the pixel 110 includes a pixel driving circuit PDC and a light emitting unit, and the pixel driving circuit PDC includes a switching transistor Tsw1, a storage capacitor Cst, a driving transistor Tdr, and a sensing transistor Tsw2. In addition, the light emitting unit may include a light emitting device (ED).

The light emitting device ED includes, for example, a first electrode provided in each of the pixels 110 provided on a substrate constituting the light emitting display panel 100 , a light emitting layer provided on the first electrode, and a second light emitting layer covering the light emitting layer. It includes an electrode 510 . The first electrode is, for example, an electrode connected to the driving transistor Tdr in FIG. 2 , the second electrode 510 is an electrode connected to the second voltage supply line PLB, and the light emitting layer includes the first electrode and the second electrode It is provided between the electrodes 510 .

The first electrode may function as an anode electrode of the light emitting device ED, and the second electrode 510 may function as a cathode electrode. That is, light may be output from the light emitting layer by the anode voltage supplied to the first electrode and the cathode voltage supplied to the cathode electrode.

The emission layer may include any one of an organic emission layer, an inorganic emission layer, and a quantum dot emission layer, or may include a stacked or mixed structure of an organic emission layer (or an inorganic emission layer) and a quantum dot emission layer.

The switching transistor Tsw1 constituting the pixel driving circuit PDC is turned on or off by the gate signal GS supplied to the gate line GL, and the data voltage Vdata supplied through the data line DL. is supplied to the gate of the driving transistor Tdr when the switching transistor Tsw1 is turned on.

The first voltage EVDD is supplied to the driving transistor Tdr and the light emitting device ED through the first voltage supply line PLA, and the second voltage EV emits light through the second voltage supply line PLB. It is supplied to the element ED.

The sensing transistor Tsw2 is turned on or off by the sensing control signal SS supplied through the sensing control line SCL, and the sensing line SL may be connected to the sensing transistor Tsw2.

The reference voltage Vref may be supplied to the pixel 110 through the sensing line SL, and a sensing signal related to a characteristic change of the driving transistor Tdr is transmitted to the sensing line SL through the sensing transistor Tsw2. can be The sensing signal is converted into a digital signal (hereinafter simply referred to as sensing data Sdata) by the data driver 300 or a separate processing unit, and the sensing data Sdata is transmitted to the control unit 400 .

The controller 400 may determine a characteristic change of the driving transistor Tdr by using the sensing data Sdata. Here, the characteristic of the driving transistor Tdr may mean a threshold voltage or mobility of the driving transistor.

The light emitting display panel 100 applied to the present invention may have a structure as shown in FIG. 2 , but the present invention is not limited thereto. Accordingly, the light emitting display panel 100 applied to the present invention may be changed into various forms other than the structure shown in FIG. 2 .

The structure of the light emitting display panel 100 will be described in detail below with reference to FIGS. 4 and 5 .

Next, as shown in FIG. 3 , the controller 400 rearranges the input image data Ri, Gi, Bi transmitted from the external system by using the timing synchronization signal TSS transmitted from the external system. For generating the gate control signal GCS and the data control signal DCS using the data alignment unit 430 for supplying the rearranged image data Data to the data driver 300 and the timing synchronization signal TSS The control signal generation unit 420 receives the timing synchronization signal TSS and the input image data Ri, Gi, Bi transmitted from the external system and transmits them to the data alignment unit 430 and the control signal generation unit 420 . The image data (Data) generated by the input unit 410 and the data alignment unit 430 and the control signals DCS and GCS generated by the control signal generation unit 420 for and an output unit 440 for outputting to the driver 200 .

The external system performs a function of driving the control unit 400 and the electronic device. That is, when the electronic device is a smartphone, the external system receives various types of voice information, image information, and text information through a wireless communication network, and transmits the received image information to the controller 400 . The image information may be input image data Ri, Gi, Bi.

The control signal generator 420 may generate a touch control signal TCS for controlling the function of the touch driver 700 .

The input unit 410 may determine a change in characteristics of the driving transistors Tdr provided in the pixels 110 of the light emitting display panel 100 by using the sensing data Sdata.

The data alignment unit 430 may process the input image data Ri, Gi, and Bi according to a change in characteristics of the driving transistors Tdr.

Next, the data driver 300 may be provided on a chip-on film attached to the light emitting display panel 100 , and may also be connected to a main board on which the control unit 400 is provided. In this case, the chip-on-film includes lines for electrically connecting the control unit 400 , the data driver 300 , and the light emitting display panel 100 , and for this purpose, the lines are connected to the main substrate and the light emitting display panel 100 . It is electrically connected to the pads provided in the . The main board is electrically connected to an external board on which an external system is mounted.

The data driver 300 may be directly mounted on the light emitting display panel 100 and then electrically connected to the main board.

However, the data driver 300 may be formed as a single integrated circuit together with the controller 400 , and the integrated circuit may be provided on a chip-on-film or directly mounted on the light emitting display panel 100 .

The data driver 300 receives a sensing signal related to a characteristic change of a driving transistor Tdr provided in the light emitting display panel 100 from the light emitting display panel 100, and converts the analog sensing signal to digital sensing data ( Sdata) to transmit the sensing data (Sdata) to the controller 400 .

The data driver 300 converts the image data (Data) input from the controller 400 into the data voltage (Vdata) during the image output period, and one horizontal period during which a gate pulse is supplied to the gate line GL. The data voltages Vdata corresponding to the horizontal lines of are supplied to the data lines DL1 to DLd. For example, the data driver 300 converts image data into data voltages Vdata using gamma voltages supplied from the gamma voltage generator, and then, during the image output period, generates data voltages Vdata. are output to the data lines DL1 to DLd.

Here, the horizontal line means a virtual line formed along the gate line GL. On the horizontal line, pixels connected to the gate line GL are arranged in a row. That is, the horizontal line means a virtual line corresponding to the gate line GL.

During the black image output period, the data driver converts the black image data input from the control unit 400 into a black data voltage, and the data driver converts one horizontal line of black for each horizontal period in which a gate pulse is supplied to the gate line GL. Data voltages are supplied to the data lines. Accordingly, a black image is output during the black image output period.

Next, the gate driver 200 may be mounted on the non-display area 130 after being formed of an integrated circuit, and may be mounted on the non-display area 130 using a gate in panel (GIP) method. It can also be directly embedded. In the case of using the gate-in-panel method, the transistors constituting the gate driver 200 may be provided in the non-display area 130 through the same process as the transistors provided in each pixel 110 of the display area 120 . can

When the gate pulse generated by the gate driver 200 is supplied to the gate of the switching transistor Tsw1 provided in the pixel 110 , the switching transistor is turned on, and thus light may be output from the pixel. When the gate-off signal is supplied to the switching transistor Tsw1, the switching transistor is turned off, and accordingly, no light is output from the pixel. The gate signal GS supplied to the gate line GL includes a gate pulse and a gate-off signal.

Finally, the touch driver 600 supplies the cathode voltage CV to the second electrodes 510 during the image output period, and applies the touch driving voltage TDV to the second electrodes 510 during the touch sensing period. supply That is, the cathode voltage CV and the touch driving voltage TDV are alternately transmitted to the second electrode 510 .

Accordingly, the second voltage EV may be the cathode voltage CV or the touch driving voltage TDV.

For example, in the image output period, when the touch driver 600 supplies the cathode voltage CV to the second electrodes 510 , the light emitting layer emits light. Accordingly, the light emitting display panel 100 outputs an image. can be

During the touch sensing period, the touch driver 600 supplies touch driving voltages TDV to the second electrodes 510 , and the touch driver 600 uses the touch sensing signals received from the second electrodes 510 . Accordingly, it is possible to determine whether or not the light emitting display panel 100 is touched or the touch position. In this case, the determination of whether or not the touch is made or the touch position may be performed by the controller 400 . That is, the touch driver 600 may perform only a function of transmitting touch sensing signals to the controller 400 .

The touch driver 600 drives the second electrode line TL connected to the second electrode 510 to a cathode voltage generator 630 generating a cathode voltage CV or a touch driving voltage generating a touch driving voltage TDV. It may be connected to the voltage generator 640 .

As shown in FIG. 1 , the cathode voltage generator 630 and the touch driving voltage generator 640 may be included in the touch driver 600 , or may be configured independently of the touch driver 600 .

In the above description, the data driver 300 , the gate driver 200 , the touch driver 600 , and the control unit 400 have been described as being independently configured, but the data driver 300 , the gate driver 200 , and the touch driver 600 . ) and at least two of the controller 400 may be configured as one integrated circuit.

For example, the data driver 300 and the touch driver 600 may be configured as one integrated circuit (IC), and the data driver 300 and the fisherman 400 may be configured as a single integrated circuit, The data driver 300 and the gate driver 200 may be configured as a single integrated circuit, and the data driver 300 , the touch driver 600 , and the controller 400 may be configured as a single integrated circuit.

4 is a plan view of a light emitting display panel applied to a light emitting display device according to the present invention, and in particular, is an exemplary view showing the Y region shown in FIG. 1 . 5 is another plan view of a light emitting display panel applied to a light emitting display device according to the present invention, and in particular, is another exemplary view showing the Y region shown in FIG. 1 .

The light emitting display panel 100 applied to the light emitting display device according to the present invention includes a substrate, a first electrode provided on each of pixels provided on the substrate, a light emitting layer provided on the first electrode, and a second light emitting layer provided on the light emitting layer. It includes an electrode 510 .

In the light emitting display panel 100 , each of the at least two second electrodes 510 covers at least two pixels 110 as shown in FIGS. 1 , 4 and 5 . That is, the second electrode 510 is patterned to cover two or more pixels.

A first electrode ANE constituting the light emitting device ED is provided in each of the pixels 110 . For example, one second electrode 510 may cover 18 first electrodes ANE. there is. That is, in FIGS. 4 and 5 , the light emitting display panel 100 in which one second electrode 510 covers 18 pixels is illustrated as an example of the present invention.

Hereinafter, as shown in FIGS. 4 and 5 , the light emitting display panel 100 in which one second electrode 510 covers 18 pixels 110 will be described as an example of the present invention.

Each of the pixels 110 may be divided by a bank BK. That is, the first electrode ANE is surrounded by the bank BK, and one pixel 110 may include the first electrode ANE and the bank BK surrounding the first electrode ANE. there is.

In this case, the second electrode line TL extends along the first direction (eg, the vertical direction of FIGS. 1 , 4 and 5 ) of the light emitting display panel 100 , and the second electrode line TL ) is connected to any one of the second electrodes 510 provided along the first direction.

For example, an insulating layer is provided between the second electrode 510 and the second electrode line TL, and the second electrode line TL is connected to the second electrode 510 through a contact hole CH provided in the insulating layer. is electrically connected to

The second electrode line TL may be provided along a region between the pixel 110 and the pixel 110 in which an image is not output, for example, a region in which the bank BK is provided. In the illustrated light emitting display panel, the data line DL may be provided in parallel or overlapping with the data line DL.

The second electrode line TL may be connected to the second electrode 510 through one contact hole CH as shown in FIG. 4 , or as shown in FIG. 5 , two contact holes ( It may be connected to the second electrode 510 through CH). Also, the second electrode line TL may be connected to the second electrode 510 through three or more contact holes CH. That is, the second electrode line TL may be connected to the second electrode 510 through at least one contact hole.

In more detail, when the cathode voltage CV is supplied to the second electrode line TL, the larger the area of the second electrode 510 is, the larger the area of the second electrode 510 is in each of the pixels covered by the second electrode 510 . The actual voltages of may be different from each other. In this case, the quality of the image may be deteriorated.

To prevent this, in the present invention, the second electrode 510 and the second electrode line TL are electrically connected at a plurality of positions, and accordingly, pixels covered by the second electrode 510 are The actual voltages at each may be equal. That is, when the second electrode line TL is connected to the second electrode 510 through at least two contact holes, a second voltage supply line provided in pixels covered by one second electrode 510 . The magnitudes of the second voltages EV supplied to the PLBs may be the same or similar, and accordingly, the quality of the pixels may be the same or similar.

In this case, the second electrode line TL may overlap another second electrode provided along the first direction, as shown in FIGS. 1, 4 and 5 .

For example, as shown in FIG. 1 , the second electrode line TL is connected to the second electrode line TL through the contact hole CH from the second electrode 510 to the touch driver 600 . and may overlap other second electrodes provided between the second electrode 510 and the touch driver 600 connected through the contact hole CH.

In detail, the second electrode line (the second electrode line indicated by TLa in FIG. 4) connected to the second electrode (the second electrode indicated by reference numeral 510a in FIG. 4) provided at the upper end of FIG. 4 is at the bottom It overlaps with the second electrode (the second electrode indicated by reference numeral 510b in FIG. 4 ) provided in the .

In the following description, when the second electrode is generically referred to by reference numeral 510, a specific second electrode among the second electrodes, for example, the 2-1 electrode, is denoted by reference numeral 510a, and the second electrode is denoted by reference numeral 510a. The second electrode is denoted by reference numeral 510b. In addition, in the following description, when referring to the second electrode line generically, reference numeral TL is used, and a specific second electrode line among the second electrode lines, for example, the 2-1 electrode line, is designated by reference numeral TLa. is displayed, and the 2-2 electrode line is denoted by reference numeral 510b.

In this case, the second electrode provided at the bottom of FIG. 4 , that is, the touch electrode line connected to the 2-2 electrode 510b, that is, the 2-2 electrode line TLb, is the second electrode provided at the upper end of FIG. 4 . It does not overlap the second electrode, and may overlap the second electrodes below it.

In more detail, the 2-1 th electrode line TLa overlaps the 2-1 th electrode 510a, and all of the second electrode lines TLa are provided between the 2-1 th electrode 510a and the touch driver 600 . It may overlap the two electrodes 510 . The 2-2nd electrode line TLb does not overlap the 2-1th electrode 510a, but overlaps the 2-2nd electrode 510b, and the 2-2nd electrode 510b and the touch driver All second electrodes 510 provided between 600 may overlap.

In addition, each of the second electrode lines TL may overlap all the second electrodes 510 provided along the first direction.

For example, as shown in FIG. 5 , the 2-1 th electrode line TLa overlaps all the second electrodes 510 provided along the first direction, and at least one contact hole CH ) is connected to the 2-1 th electrode 510a. In this case, the 2-2 electrode line TLb also overlaps all the second electrodes 510 provided along the first direction, and the 2-2 electrode line TLb passes through at least one contact hole CH. (510b) is connected.

When the second electrode lines TL are provided in the light emitting display panel 100 in the same shape as shown in FIG. 5 , the cathode voltages CV or the touch driving voltage supplied to the second electrode lines TL are provided. Since the sizes of the TDRs may be the same or similar, image quality may be improved, and touch sensitivity may be improved.

In addition, when the second electrode lines TL are provided in the light emitting display panel 100 in the same shape as shown in FIG. 5 , the size of parasitic capacitances generated around the second electrode lines TL is displayed in the light emitting display. Since all regions of the panel 100 may be the same or similar, the influence of parasitic capacitances may be the same or similar, and thus image quality and touch sensitivity in all regions of the light emitting display panel may be uniform. can

6 is an exemplary view showing a cross-section taken along line A-A' shown in FIG. 5 .

As described above, the light emitting display device according to the present invention includes the light emitting display panel 100 , the data driver 300 , the gate driver 200 , the touch driver 600 , and the control unit 400 .

Here, in the light emitting display panel 100 applied to the present invention, as shown in FIGS. 1 to 6 , the substrate 101, the first electrode ANE provided in each of the pixels provided on the substrate, and the first electrode The light emitting layer EL provided in the light emitting layer, the second electrode 510 covering the light emitting layer, the insulating film 104 covering the at least two second electrodes 510 provided on the substrate, and the insulating film provided in the first direction of the substrate , and includes a 2-1 th electrode line TLa connected to a 2-1 th electrode 510a among at least two second electrodes through a contact hole CH provided in the insulating layer.

First, the substrate 101 may be a glass substrate or a plastic substrate, and in addition to this, may be formed of various types of films.

Next, the pixel driving layer 102 including the pixel driving circuit PDC as described with reference to FIG. 2 is provided on the substrate 101 . The pixel driving circuit PDC may include a switching transistor Tsw1 , a storage capacitor Cst, a driving transistor Tdr, a sensing transistor Tsw2 , and the like.

The pixel driving layer 102 includes a data line DL, a gate line GL, a first voltage supply line PLA, a second voltage supply line PLB, a sensing line SL, a sensing control line SCL, and the like. Various types of lines may be provided. Each of the lines may be formed of one metal such as copper (Cu), or at least two metals may be stacked.

In addition, at least one insulating layer may be provided in the pixel driving layer 102 to insulate the transistors and lines as described above. Each of the insulating layers may be formed of at least one inorganic layer or at least one organic layer, or may be formed of at least one inorganic layer and at least one organic layer.

Next, a flat film 103 is provided on the upper end of the pixel driving layer 102 .

The planarization layer 103 functions to planarize surfaces curved by the transistors and lines as described above.

That is, the top surface of the pixel driving layer 102 has a curved surface by the transistors and lines provided thereunder. In this case, as the flattening layer 103 having a thickness greater than that of the pixel driving layer 102 covers the pixel driving layer 102 , the top surface of the flattening layer 103 may be flat.

The planarization layer 103 may be formed of at least one inorganic layer or at least one organic layer, or may be formed of at least one inorganic layer and at least one organic layer.

Next, the first electrode ANE is provided on the top surface of the flat film 103 having a flat surface.

The first electrode ANE may be formed of a transparent electrode or an opaque electrode, or may include at least one transparent electrode and at least one opaque electrode.

The first electrode ANE is connected to the driving transistor Tdr.

Next, the emission layer EL is provided on the upper end of the first electrode ANE.

The emission layer EL may include any one of an organic emission layer, an inorganic emission layer, and a quantum dot emission layer, or may include a stacked or mixed structure of an organic emission layer (or an inorganic emission layer) and a quantum dot emission layer.

The light emitting layer EL provided in any one pixel may be connected to the light emitting layer EL provided in an adjacent pixel, as shown in FIG. 6 . That is, the light emitting layer EL may be provided on the entire surface of the substrate 101 in the form of one plate.

However, the light emitting layer EL may be spaced apart from the light emitting layer provided in an adjacent pixel. That is, the emission layer EL and the first electrode ANE may be separated for each pixel and independently provided for each pixel.

Next, the bank BK is provided around the light emitting layer EL. The pixels 110 may be divided by the bank BK. For example, 6 pixels 110 divided by banks BK are shown in FIG. 6 .

Next, the second electrode 510 covers the emission layer EL.

The second electrode 510 may be formed of a transparent electrode or an opaque electrode, or may include at least one transparent electrode and at least one opaque electrode.

Each of the at least two second electrodes 510 may cover at least two pixels 110 .

For example, as described with reference to FIGS. 4 and 5 , the 2-1 th electrode 510a may cover 18 pixels 110 . In this case, the 2-2 electrode 510b may also cover 18 pixels 110 .

The number of pixels 110 covered by one second electrode 510 may be variously changed according to the size of the second electrode 510 and the size of the pixels 110 .

That is, the light emitting display panel 100 may include at least two second electrodes 510 . To this end, as shown in FIG. 6 , a barrier rib PT may be formed in the bank BK to which the two second electrodes 510 are adjacent.

The partition wall PT functions to separate the adjacent second electrodes 510 from each other. That is, the second electrodes 510 provided on the light emitting layer EL may be separated by the barrier rib PT provided at the top of the bank BK that separates the pixels.

The barrier rib PT may be provided on the top surface of the bank BK or, as shown in FIG. 6 , may be provided on the top surface of the light emitting layer EL.

However, the present invention is not limited thereto. That is, the second electrodes 510 adjacent to each other may be separated from each other by various structures other than the partition wall PT.

Next, the insulating layer 104 covers the at least two second electrodes 510 provided on the substrate.

That is, the insulating film 104 may be provided on the entire surface of the substrate 101 in the form of a single plate.

In this case, a contact hole CH exposing the second electrode 510 may be formed in a region of the insulating layer 104 that overlaps the bank BK.

Next, the second electrode line TL is provided in the insulating layer 104 , extends along the first direction of the substrate 101 , and is formed through a contact hole CH provided in the insulating layer 104 . It is electrically connected to the second electrode 510 .

For example, in FIGS. 4 and 5 , the second-first electrode 510a is electrically connected to the second-first electrode line TLa through the contact hole CH, and the second-second electrode 510b is electrically connected to the second electrode 510b. is electrically connected to the 2-2 electrode line TLb through another contact hole CH.

In this case, the contact hole CH may be provided at various positions, but in order not to reduce the aperture ratio of the pixel 110 , for example, as shown in FIG. 6 , the contact hole CH may be provided at the upper end of the bank BK. can

The second electrode line TL may be connected to the second electrode 510 through one contact hole CH, but may also be connected to the second electrode 510 through at least two contact holes CH.

For example, FIG. 4 shows a light emitting display panel in which one second electrode line TL is connected to a second electrode through one contact hole CH. That is, in FIG. 4 , the 2-1 th electrode line TLa is connected to the 2-1 th electrode 510a through one contact hole CH, and the 2-2 th electrode line TLb also has one contact hole CH. It is connected to the 2-2 electrode 510b through the contact hole CH.

Also, FIG. 5 shows a light emitting display panel in which one second electrode line TL is connected to a second electrode through two contact holes CH. That is, in FIG. 5 , the 2-1 th electrode line TLa is connected to the 2-1 th electrode 510a through two contact holes CH, and the 2-2 th electrode line TLb also has two contact holes. It is connected to the 2-2 electrode 510b through the contact holes CH.

Each of the second electrode lines TL may overlap other second electrodes provided along the first direction.

For example, in FIG. 4 , the 2-1 th electrode line TLa overlaps the 2-1 th electrode 510a and is provided between the 2-1 th electrode 510a and the touch driver 600 . It may overlap all of the second electrodes 510 to be used. In this case, the 2-2 electrode line TLb does not overlap the 2-1 electrode 510a, but overlaps the 2-2 electrode 510b and the 2-2 electrode 510b. It may overlap all the second electrodes 510 provided between the touch driver 600 and the touch driver 600 .

That is, the second electrode line TL may overlap the second electrodes 510 provided between the second electrode 510 to which the second electrode line TL is connected and the touch driver 600 .

Accordingly, as shown in FIG. 1 , the number of second electrodes 510 overlapping the second electrode line TL connected to the second electrode 510 provided at a distant position from the touch driver 600 is , the second electrode line TL connected to the second electrode 510 provided at a position close to the touch driver 600 may be greater than the number of overlapping second electrodes 510 .

However, the second electrode line TL may overlap all the second electrodes 510 provided along the first direction.

For example, as shown in FIG. 5 , the 2-1 th electrode line TLa overlaps the 2-1 th electrode 510a and the 2-2 th electrode 510b, and the 2-2 electrode line TLa The second electrodes 510 provided between the 510b and the touch driver 600 may also overlap.

In addition, the 2-2 electrode line TLb may also overlap the 2-1 th electrode 510a and the 2-2 th electrode 510b, and may be disposed between the 2-2 electrode 510b and the touch driver 600 . It may also overlap with the second electrodes 510 provided in the .

Accordingly, in this case, all second electrode lines TL may have the same length, and the number of second electrodes 510 overlapping each of the second electrode lines TL may also be the same.

7 is an exemplary view for explaining a method of driving a light emitting display device according to the present invention.

The light emitting display device according to the present invention, as described with reference to FIG. 1 , includes a light emitting display panel 100 including pixels 110 for displaying an image, and data lines DL1 to DLd provided on the light emitting display panel. ), the data driver 300 supplying data voltages Vdata, the gate driver 200 supplying gate voltages to the gate lines GL1 to GLg provided in the light emitting display panel 100, and light emission during the image output period. The touch driver 600 and the data driver supply the cathode voltage CV to the second electrodes 510 provided in the display panel, and supply the touch driving voltage TDV to the second electrodes 510 during the touch sensing period. 300 , and a control unit 400 for controlling the gate driver 200 and the touch driver 600 .

In particular, as described with reference to FIGS. 1 to 6 , the light emitting display panel 100 applied to the present invention includes a substrate 101, a first electrode ANE provided in each of pixels provided on the substrate, The light emitting layer EL provided on the first electrode, the second electrode 510 covering the light emitting layer, the insulating film 104 covering the at least two second electrodes 510 provided on the substrate, and the insulating film provided on the substrate, It extends along the first direction and includes a 2-1 th electrode line TLa connected to the 2-1 th electrode 510a among at least two second electrodes through a contact hole CH provided in the insulating layer. do.

Here, the touch sensing period TP is included in the black image output period BIDP in which the black image BI is output in the pixels covered by the second electrode 510 as shown in FIG. 7 . can

For example, as shown in FIG. 7 , the period in which the image I is output from the five horizontal lines corresponding to the 2-1 electrode 510a is the image output period IDP, and the five horizontal lines A period during which the black image BI is output after an image is output from each of the images may be a black image output period BIDP.

Here, the image I corresponds to the input image data Ri, Gi, and Bi, and refers to an image output through the light emitting display panel. The black image BI is an image corresponding to black image data, an image representing black, and an image output through a light emitting display panel. The black image data may be generated by the controller 400 .

In this case, the touch sensing period TP is, for example, included in the period in which the black image BI is output after the image I is output in all of the pixels covered by the 2-1 th electrode 510a should be Accordingly, the touch sensing period TP should be smaller than the black image output period BIDP. In particular, the touch sensing period TP should start after an image is output from pixels provided in the last horizontal line among the pixels covered by the 2-1 electrode 510a.

Accordingly, the touch sensing period TP should start after the black image BI is output from the pixels provided on the last horizontal line among the pixels covered by the 2-1 th electrode 510a. The period TP must be less than or equal to the black image output period BIDP. That is, the touch sensing period TP should be included in the black image output period BIDP.

In addition, as described above, the black image output period BIDP must occur after the image output period IDP during which the image I is output, and in particular, the last It should be generated after the image output period (IDP) of the pixels provided on the horizontal line.

Here, the last horizontal line included in the 2-1 electrode 510a means a horizontal line to which a gate pulse is input last among horizontal lines included in the 2-1 electrode 510a. That is, the pixels provided in the last horizontal line output an image last among the pixels covered by the 2-1 th electrode 510a.

In this case, the touch driving voltage TDV supplied to the second electrode 510 in the touch sensing period TP is based on the cathode voltage CV supplied to the second electrode 510 in the image output period IDP. It can be a swinging AC voltage.

For example, when the cathode voltage CV is 0V, the touch driving voltage TDV may be an AC voltage swinging at +1V and -1V.

However, the present invention is not limited thereto. Accordingly, the touch driving voltage TDV may have various levels and various types of voltages.

For example, the black data voltage supplied to the data line DL during the black image output period BIDP has a level at which the driving transistor Tdr is turned off. Since the driving transistor Tdr is turned off, the light emitting device EU does not emit light. Accordingly, even if various levels and various types of touch driving voltages are supplied to the second electrode 510 constituting the light emitting device EU, the black image may not be significantly affected.

Even when the driving transistor Tdr is turned on by the black data voltage, if the touch driving voltage having a level sufficient to express the black image BI is supplied to the second electrode 510, the black image BI is normally output. can be

Accordingly, the touch driving voltage TDV does not necessarily have to swing based on the cathode voltage CV, and may have various levels and various types of voltages.

Hereinafter, a method of driving a light emitting display device according to the present invention will be described with reference to FIGS. 1 to 7 .

First, when a first frame period starts, the controller 400 converts input image data Ri, Gi, Bi transmitted from an external system into image data Data. The controller 400 transmits image data to the data driver 300 .

Next, the data driver 300 converts the image data into data voltages Vdata and outputs the image data voltages Vdata to the data lines DL1 to DLd.

Accordingly, as shown in FIG. 7 , when the 1st Frame Period begins, an image is output from the first horizontal line corresponding to the first gate line to which the gate pulse is first input among the gate lines. , as the gate pulses are sequentially supplied to the second to fifth gate lines, the image I is output from the second to fifth horizontal lines.

In the following description, for convenience of explanation, the 2-1 th electrode 510a covers pixels connected to the first to fifth gate lines, that is, pixels provided on the first to fifth horizontal lines, and A light emitting display panel in which there is is described as an example of the present invention. In this case, the 2-1 th electrode 510a covers pixels provided in the first to fifth horizontal lines, and thus, the 2-1 th electrode 510a in FIG. 7 is connected to the first to fifth horizontal lines. It corresponds to the pixels provided in the fields.

A period in which an image is output from each of the first to fifth horizontal lines is an image output period IDP.

Next, after the image I is output from the pixels provided in the first horizontal line, that is, when the image output period IDP for the first horizontal line elapses, the black pixels are displayed in the pixels provided in the first horizontal line. A black image output period BIDP in which the image BI is output begins.

In addition, when the image output period IDP for the second horizontal line elapses, the black image output period BIDP for the second horizontal line starts, and when the image output period IDP for the third horizontal line elapses, the first image output period IDP 3 The black image output period (BIDP) for the horizontal line starts, and when the image output period (IDP) for the fourth horizontal line elapses, the black image output period (BIDP) for the fourth horizontal line starts, and the fifth When the image output period IDP for the horizontal line elapses, the black image output period BIDP for the fifth horizontal line starts.

In the image output period IDP, the cathode voltage CV is supplied to the 2-1 electrode 510a, and even when the black image output period BIDP starts, the cathode voltage CV is applied to the 2-1 electrode 510a. This can be supplied.

Accordingly, the cathode voltage CV may be supplied to the 2-1 electrode 510a even at the timing when the black image output period BIDP for the fifth horizontal line starts.

However, after the black image output period BIDP for the fifth horizontal line starts, when a preset period, for example, one horizontal period during which the data voltage is output, elapses, the touch on the 2-1 th electrode 510a The sensing period TP may start, and the touch driving voltage TDV is supplied to the 2-1 electrode 510a during the touch sensing period TP.

However, the black image output period BIDP and the touch sensing period TP for the fifth horizontal line may start at the same time.

Next, when the touch sensing period TP for the 2-1 th electrode 510a starts, the touch driver 600 supplies the touch driving voltage TDV to the 2-1 th electrode 510a, and the touch driving voltage A touch sensing signal generated by the 2-1 th electrode 510a by the TDV is received.

The touch driver 600 may determine whether the 2-1 th electrode 510a has touched by using the touch sensing signal, and may determine the position of the 2-1 th electrode 510a, that is, the touch position. However, as described above, the control unit 400 may determine whether or not to touch the 2-1 th electrode 510a or the touch position.

Next, while it is determined whether the second-first electrode 510a is touched, images I are sequentially output from the pixels covered by the second second electrode 510b.

Next, when the image output period IDP for the pixels covered by the second second electrode 510b elapses, the black image output period BIDP for the second second electrode 510b starts, and the black image During the output period BIDP, the touch driving voltage TDV is supplied to the second second electrode 510b to determine whether the second electrode 510b is touched.

Finally, the above-described processes are sequentially performed for all the second electrodes and all pixels provided along the 2-1 th electrode line TL1, and thus, the 2-1 th electrode line TL1 ), it may be determined whether or not all of the second electrodes are touched.

In this case, as shown in FIG. 1 , two or more second electrodes may be provided on one horizontal line.

Therefore, in the above description, the description of the image output period IDP for the pixels covered by the 2-1 th electrode 510a, the description of the black image output period BIDP, and the touch sensing period TP The description can be equally applied to other second electrodes 510 arranged in a line with the second-first electrode 510a along the first horizontal line, and also to another horizontal line of the light emitting display panel 100 . The same may be applied to the remaining second electrodes 510 provided in the lines.

That is, according to the present invention, it is possible to determine whether a touch is made during the black image output period BIDP. For this purpose, the touch driving voltage TDV may be supplied to the second electrodes 510 during the touch sensing period TP.

According to the present invention as described above, since the cathode electrode used as one electrode of the light emitting device EU can also be used as the second electrode, even if a separate touch panel is not provided, a touch can be detected. , no additional process and mask for generating the second electrode are required.

In addition, according to the present invention, since the light emitting device is not affected by the second electrode, a phenomenon in which image quality is not deteriorated by the second electrode does not occur.

Those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: light emitting display panel 200: gate driver
300: data driver 400: control unit
600: touch driver

Claims (10)

Board;
a first electrode provided on each of the pixels provided on the substrate;
a light emitting layer provided on the first electrode; and
It includes a second electrode provided on the light emitting layer,
and the second electrode is patterned to cover two or more pixels. The method of claim 1,
A display device in which a cathode voltage and a touch driving voltage are alternately transmitted to the second electrode. The method of claim 1,
The second electrode provided on the light emitting layer is separated by a barrier rib provided at an upper end of a bank that separates pixels. The method of claim 1,
an insulating film provided on the second electrode; and
and an electrode line extending on the insulating layer along the first direction of the substrate and connected to the second electrode through a contact hole provided in the insulating layer. 5. The method of claim 4,
The electrode line is connected to the second electrode through at least two contact holes. 5. The method of claim 4,
The electrode line overlaps the second electrode provided along the first direction. The method of claim 1,
a data driver supplying data voltages to data lines provided on the substrate;
a gate driver supplying gate voltages to gate lines provided on the substrate;
a touch driver supplying a cathode voltage to the second electrodes in an image output period and supplying a touch driving voltage to the second electrodes in a touch sensing period; and
The light emitting display device further comprising a control unit for controlling the data driver, the gate driver, and the touch driver. 8. The method of claim 7,
The touch sensing period is included in a black image output period in which a black image is output in pixels covered by the second electrode. 9. The method of claim 8,
The black image output period is generated after the image output period in which an image is output. 8. The method of claim 7,
The touch driving voltage is an alternating current voltage swinging based on the cathode voltage.

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