KR20200021973A - Touch sensible organic light emitting diode display - Google Patents

Abstract

The present invention relates to a light-emitting display device with a touch sensing function to improve display properties. According to an embodiment of the present invention, the light-emitting display device comprises: a substrate; a thin film transistor positioned on a first surface of the substrate; a protection film covering the thin film transistor; a first electrode positioned on the protection film and connected to the thin film transistor through a hole of the protection film; a partition defining an opening part exposing a portion of the first electrode; a second electrode overlapping the portion of the first electrode; a light emitting layer which is positioned in the opening part and includes a portion positioned between the portion of the first electrode and the second electrode; a plurality of insulation layers positioned on the second electrode; and a touch sensing electrode formed as a layer deposited on the second electrode. The plurality of insulation layers are positioned between the touch sensing electrode and the second electrode. The plurality of insulation layers include: a first layer positioned on the second electrode; an organic flattening layer positioned on the second electrode; and a pair of inorganic layers positioned on the second electrode. The first layer is positioned between the organic flattening layer and the second electrode. The pair of inorganic layers include: a first inorganic layer coming in contact with the first layer; and a second inorganic layer coming in contact with the organic flattening layer. The second inorganic layer comes in contact with the first inorganic layer on a first area overlapping the protection film. The first area overlaps the protection film in a first direction perpendicular to the first surface of the substrate.

Description

Organic Light Emitting Display with Touch Detection {TOUCH SENSIBLE ORGANIC LIGHT EMITTING DIODE DISPLAY}

The present invention relates to an organic light emitting display device having a touch sensing function.

The organic light emitting diode display includes two electrodes and a light emitting layer interposed therebetween, and electrons injected from one electrode and holes injected from another electrode are combined in the light emitting layer to form excitons. The excitons emit light while releasing energy.

The organic light emitting diode display includes an organic light emitting element and a plurality of thin film transistors for driving the organic light emitting element. They are made of a plurality of thin films, and for process reasons, thin film transistors are usually placed on the bottom, organic light emitting devices on the top, anodes of the organic light emitting devices on the bottom, and cathodes on the top.

The organic light emitting device includes an anode and a cathode as two electrodes and an organic light emitting member as a light emitting layer therebetween, and the organic light emitting member emits light of three primary colors such as red, green, and blue, or emits white light. The material varies depending on the color of the organic light emitting member, and in the case of emitting white light, a method of stacking light emitting materials emitting red, green, and blue light to make the synthetic light white is used. In addition, when the organic light emitting member emits white light, a color filter may be added to obtain light having a desired color.

The thin film transistor includes a switching transistor for switching a voltage applied to each pixel, a driving transistor for driving an organic light emitting element, and the like.

Such an organic light emitting diode display may be classified into a top emission method emitting light upward and a bottom emission method emitting downward.

On the other hand, a touch screen panel is a device that touches a finger or a touch pen (stylus) on the screen to write and draw characters or pictures, or execute icons to perform a desired command on a machine such as a computer. Say. The display device to which the touch screen panel is attached may determine whether the user's finger or touch pen touches the screen and the contact location information. However, such a display device has problems such as a cost increase due to the touch screen panel, a decrease in yield due to an additional process of adhering the touch screen panel to the display panel, a decrease in the luminance and viewing angle of the display panel such as an organic light emitting display device, and an increase in product thickness. .

The present disclosure is to reduce the thickness of an organic light emitting display device having a touch sensing function and to improve display characteristics such as transmittance and viewing angle.

In an exemplary embodiment, a light emitting display device includes a substrate, a thin film transistor positioned on a first surface of the substrate, a passivation layer covering the thin film transistor, a passivation layer disposed on the passivation layer and connected to the thin film transistor through a hole of the passivation layer. A first electrode, a partition defining an opening exposing a portion of the first electrode, a second electrode overlapping the portion of the first electrode, and located in the opening and between the portion of the first electrode and the second electrode And a touch sensing electrode formed as a layer stacked on the second electrode, and a light emitting layer including a portion positioned on the second electrode, and a plurality of insulating layers positioned on the second electrode, wherein the plurality of insulating layers include the touch sensing. Located between the electrode and the second electrode, the plurality of insulating layers, the first layer positioned on the second electrode, on the second electrode An organic planarization layer positioned and a pair of inorganic layers positioned on the second electrode, wherein the first layer is positioned between the organic planarization layer and the second electrode, and the pair of inorganic layers is A first inorganic layer in contact with a first layer, and a second inorganic layer in contact with the organic planarization layer, wherein the second inorganic layer is in contact with the first inorganic layer in a first region overlapping the protective film; The first region overlaps the passivation layer in a first direction perpendicular to the first surface of the substrate.

The first inorganic layer may include a recess overlapping the portion of the first electrode in the first direction, and the organic planarization layer may include a flat surface overlapping the recess in the first direction.

The first layer may include an inorganic material.

The display device may further include a first insulating layer positioned between the touch sensing electrode and the plurality of insulating layers.

The touch sensing electrode may be one of a plurality of touch sensing electrodes, and the first insulating layer may separate portions of the plurality of touch sensing electrodes from each other.

The display device may further include a second insulating layer disposed on the first insulating layer, wherein the touch sensing electrode may be positioned between the second insulating layer and the first insulating layer.

A protective layer may be further disposed on the second insulating layer, and the second insulating layer may be positioned between the protective layer and the touch sensing electrode.

The first inorganic layer may include a first portion overlapping the opening portion in the first direction, and a second portion overlapping the partition wall in the first direction, and the first portion may be larger than the second portion. It may be closer to the substrate.

A light emitting display device according to an embodiment includes a display panel and a touch sensor positioned on the display panel, wherein the display panel includes a substrate, a thin film transistor positioned on the first surface of the substrate, and a passivation layer covering the thin film transistor. A pixel electrode connected to the thin film transistor through a hole of the passivation layer, a partition defining an opening exposing one surface of the pixel electrode, a common electrode overlapping the one surface of the pixel electrode, the one surface of the pixel electrode and the A light emitting layer including a portion positioned between the common electrodes, and a plurality of insulating layers positioned on the common electrode, wherein the touch sensor includes a touch sensing electrode formed on the display panel, and the plurality of insulating layers Is positioned between the touch sensing electrode and the common electrode, the plurality of insulation Is an organic layer positioned on the common electrode, a first layer positioned between the organic layer and the common electrode, a first inorganic layer located between the first layer and the organic layer and in contact with the first layer, and the touch sensing A second inorganic layer disposed between an electrode and the first inorganic layer, the second inorganic layer contacting the first inorganic layer in a region overlapping with the protective film in a direction perpendicular to the first surface of the substrate, wherein the organic layer includes: And a first surface facing the first inorganic layer, and a second surface facing the first surface and flatter than the first surface.

The touch sensing electrode may form a layer directly formed on one surface of the display panel.

The organic light emitting diode and the thin film transistor of the organic light emitting diode display are sealed by using a plurality of encapsulating thin films, and a thin touch sensor is formed thereon, thereby reducing the thickness of the organic light emitting diode display having the touch sensing function, and the transmittance and the viewing angle. Display characteristics can be improved.

1 is a block diagram of an organic light emitting display device having a touch sensing function according to an embodiment of the present invention.
2 is an equivalent circuit diagram of an organic light emitting display device having a touch sensing function according to an embodiment of the present invention.
3 is a cross-sectional view of one pixel of an organic light emitting diode display with a touch sensing function according to an exemplary embodiment of the present invention.
4 is an equivalent circuit diagram of a touch sensing unit of an organic light emitting display device having a touch sensing function according to an embodiment of the present invention.
5 and 6 are cross-sectional views of one pixel of an organic light emitting diode display having a touch sensing function according to an exemplary embodiment of the present invention.
7 is a diagram illustrating a connection relationship between a high frequency sensor and an organic light emitting diode display having a touch sensing function according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when the other part is "right on" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

First, an organic light emitting display device having a touch sensing function according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a block diagram of an organic light emitting diode display according to an exemplary embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram of one pixel in the organic light emitting diode display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an organic light emitting diode display according to an exemplary embodiment includes a display panel 300 including a touch sensing unit (not shown), and a scan driver 400 connected to the display panel 300. The data driver 500 and the sensing signal processor 800 may include a touch determination unit 900 connected to the sensing signal processor 800.

1 and 2, the display panel 300 includes a plurality of signal lines 121, 171, and 172 and a plurality of pixels PX connected to the plurality of signal lines 121, 171, and 172 and arranged in a substantially matrix form.

The signal line includes a plurality of scanning signal lines 121 for transmitting a gate signal (or a scanning signal), a plurality of data lines 171 for transmitting a data signal, and a plurality of driving signals for transmitting a driving voltage. A driving voltage line 172 or the like. The scan signal lines 121 extend substantially in the row direction and are substantially parallel to each other, and the data lines 171 extend substantially in the column direction and are substantially parallel to each other. Although the driving voltage line 172 is shown to extend substantially in the column direction, the driving voltage line 172 may extend in the row direction or the column direction or may be formed in a net shape. In addition, the signal line may further include a sensing signal line (not shown) that transmits a sensing signal of the touch sensing unit.

As shown in FIG. 2, each pixel PX includes a switching transistor Qs, a driving transistor Qd, a storage capacitor Cst, and an organic light. emitting element (LD).

The switching transistor Qs has a control terminal, an input terminal, and an output terminal. The control terminal is connected to the scan signal line 121, and the input terminal is a data line 171. ), And the output terminal is connected to the driving transistor Qd. The switching transistor Qs transfers the data signal received from the data line 171 to the driving transistor Qd in response to the scan signal received from the scan signal line 121.

The driving transistor Qd also has a control terminal, an input terminal, and an output terminal. The control terminal is connected to the switching transistor Qs, the input terminal is connected to the driving voltage line 172, and the output terminal is an organic light emitting element. Is connected to (LD). The driving transistor Qd flows an output current ILD that varies in size depending on the voltage applied between the control terminal and the output terminal.

The capacitor Cst is connected between the control terminal and the input terminal of the driving transistor Qd. The capacitor Cst charges the data signal applied to the control terminal of the driving transistor Qd and maintains it even after the switching transistor Qs is turned off.

The organic light emitting element LD is an organic light emitting diode (OLED), for example, an anode connected to an output terminal of the driving transistor Qd and a cathode connected to a common voltage Vss. has a cathode The organic light emitting element LD emits light of which the intensity varies depending on the output current ILD of the driving transistor Qd to display an image. The organic light emitting element LD may include an organic material that uniquely emits one or more light of primary colors such as three primary colors of red, green, and blue, or may include an organic material that emits white color. The light emitting display displays a desired image by the spatial sum of these colors.

The switching transistor Qs and the driving transistor Qd are n-channel field effect transistors (FETs), but at least one of them may be a p-channel field effect transistor. In addition, the connection relationship between the transistors Qs and Qd, the capacitor Cst, and the organic light emitting element LD may be changed.

Referring back to FIGS. 1 and 2, the scan driver 400 is connected to the scan signal line 121 and has a high voltage Von for turning on the switching transistor Qs and a low voltage Voff for turning off. The scan signal formed by the combination is applied to the scan signal line 121.

The data driver 500 is connected to the data line 171 and generates a data voltage representing an image signal and applies it to the data line 171.

The sensing signal processor 800 receives a sensing signal from a touch sensing unit (not shown) of the display panel 300 to perform signal processing such as amplification and filtering, and then performs analog-to-digital conversion to generate a digital sensing signal DS. do.

The touch determiner 900 receives the digital sense signal DS from the sense signal processor 800, performs a predetermined calculation process, determines whether or not the touch has occurred, and sends out the contact information INF to an external device. The external device can transmit the image signal based on the same to the OLED display. On the other hand, when the external device directly performs the function of the touch determination unit 900 by receiving the digital detection signal DS to determine the contact position, the contact determination unit 900 may be omitted.

Next, the display operation of the organic light emitting diode display will be described.

The data driver 500 receives a digital output image signal for the pixels PX of each row, converts the digital output image signal into an analog data voltage, and then applies it to the data line 171.

The scan driver 400 applies a high voltage Von to the scan signal line 121 to turn on the switching transistor Qs connected to the scan signal line 121. Then, the data voltage applied to the data line 171 is transferred to the pixel PX through the turned-on switching transistor Qs.

The driving transistor Qd receives a data voltage through the turned-on switching transistor Qs and generates an output current ILD corresponding thereto. The organic light emitting element LD emits light of intensity corresponding to the output current ILD of the driving transistor Qd.

By repeating this process in units of one horizontal period (or " 1H "), a scan signal is sequentially applied to all the scan signal lines 121 and a data voltage is applied to all the pixels PX. Display the video.

Next, detailed structures of the display panel of the organic light emitting diode display illustrated in FIGS. 1 and 2 will be described with reference to FIGS. 3 and 4 along with FIGS. 1 and 2.

3 is a cross-sectional view of a driving transistor and an organic light emitting diode for one pixel of an organic light emitting diode display according to an exemplary embodiment of the present invention, and FIG. 4 is a touch sensing unit of the organic light emitting diode display according to an exemplary embodiment of the present invention. Equivalent circuit diagram.

First, referring to FIG. 4, a touch sensing unit of an organic light emitting display device having a touch sensing function according to an exemplary embodiment of the present invention may include a variable capacitor Cv and a sensing signal line SL connected to the sensing signal line SL. It includes a reference capacitor (Cr) connected between the voltage (Vr) terminal.

The capacitance of the variable capacitor Cv may vary depending on an external stimulus such as a touch such as a finger Fn of a user applied to the upper terminal of the variable capacitor Cv. One such external stimulus is pressure. When the capacitance of the variable capacitor Cv changes, the magnitude of the contact voltage Vn between the reference capacitor Cr and the variable capacitor Cv changes, depending on the magnitude of the capacitance. The contact voltage Vn flows through the detection signal line SL as a detection signal, and based on the contact voltage Vn, the contact voltage and the contact position may be determined. At this time, the reference capacitor Cr has a fixed capacitance, and the reference voltage Vr applied to the reference capacitor Cr has a constant voltage value, so that the contact voltage Vn varies in a certain range. Therefore, the sensing signal may always have a voltage range within a certain range, thereby easily determining whether or not the contact is made.

Referring to FIG. 3 together with FIGS. 1, 2, and 4, the driving transistor Qd, the organic light emitting diode LD, and the touch sensing unit of the organic light emitting diode display having a touch sensing function according to an exemplary embodiment of the present invention. Sectional structures, such as this, are demonstrated in detail.

A plurality of gate conductors including a control electrode 124 is formed on an insulating substrate 110 made of transparent glass or plastic.

A gate insulating layer 140, which may be made of silicon nitride (SiNx) or silicon oxide (SiOx), is formed on the gate conductor.

A plurality of semiconductors 154 are formed on the gate insulating layer 140. The semiconductor 154 overlaps the control electrode 124.

A plurality of pairs of ohmic contacts 163 and 165 are arranged in pairs on the semiconductor 154.

A plurality of data conductors including a plurality of driving voltage lines 172 and a plurality of output electrodes 175 are formed on the ohmic contact 163 and the gate insulating layer 140.

The driving voltage line 172 transfers a driving voltage and includes an input electrode 173 extending toward the control electrode 124.

The output electrode 175 is separated from the driving voltage line 172.

Input electrode 173 and output electrode 175 face over semiconductor 154.

The control electrode 124, the input electrode 173, and the output electrode 175 form the driving transistor Qd together with the semiconductor 154, and channels of the driving transistor Qd are the input electrode 173 and the output electrode 175. Is formed in the semiconductor 154 between.

The ohmic contacts 163 and 165 exist only between the semiconductor 154 underneath and the data conductor thereon to lower the contact resistance therebetween. The semiconductor 154 may be exposed between the input electrode 173 and the output electrode 175 without being blocked by the data conductor.

A lower passivation layer 180p may be formed on the gate insulating layer 140, the data conductor, and the exposed semiconductor 154, which may be made of an inorganic insulator such as silicon nitride or silicon oxide.

An upper passivation layer 180q is formed on the lower passivation layer 180p. The upper passivation layer 180q may be made of an organic material and may have a flat surface.

A contact hole 185 exposing the output electrode 175 is formed in the lower passivation layer 180p and the upper passivation layer 180q.

A plurality of pixel electrodes 191 are formed on the upper passivation layer 180q. The pixel electrode 191 is made of a reflective metal such as aluminum (Al), silver (Ag), gold (Au), platinum (Pt), nickel (Ni), copper (Cu), tungsten (W), or an alloy thereof. Can be made. The pixel electrode 191 may further include a transparent electrode disposed above or below the layer made of the reflective metal, and may be made of a conductive metal oxide such as indium tin oxide (ITO) or indium zinc oxide (IZO). have. Such transparent electrodes can improve adhesion to other layers of layers made of reflective metal and prevent corrosion.

The pixel electrode 191 is physically and electrically connected to the output electrode 175 through the contact hole 185.

A partition 360 is formed on the upper passivation layer 180q. The partition wall 360 defines an opening by surrounding the edge of the pixel electrode 191 like a bank and may be made of an organic insulator or an inorganic insulator. The partition wall 360 may also be made of a photoresist comprising a black pigment, in which case the partition wall 360 may serve as a light blocking member.

An organic light emitting member 370 is formed in an opening on the pixel electrode 191 defined by the partition wall 360. The organic light emitting member 370 is made of an organic material that uniquely emits light of any one of primary colors such as three primary colors of red, green, and blue. The organic light emitting diode display displays a desired image by using a spatial sum of primary color light emitted by the organic light emitting members 370.

The organic light emitting member 370 may have a multilayer structure including an auxiliary layer (not shown) for improving the light emitting efficiency of the light emitting layer in addition to the light emitting layer (not shown) for emitting light. The secondary layer includes an electron transport layer (not shown) and a hole transport layer (not shown) for balancing electrons and holes, and an electron injection layer for enhancing the injection of electrons and holes ( electron injecting layers (not shown) and hole injecting layers (not shown).

The common electrode 270 is formed on the entire surface of the organic light emitting member 370. The common electrode 270 receives a common voltage Vss, and may be made of a transparent conductive material such as ITO or IZO, or may be formed of a thin metal layer that can transmit light.

In the organic light emitting diode display, the pixel electrode 191, the organic light emitting member 370, and the common electrode 270 form an organic light emitting element LD, and the pixel electrode 191 is an anode and a common electrode 270. ) Becomes a cathode or, conversely, the pixel electrode 191 becomes a cathode and the common electrode 270 becomes an anode. The organic light emitting diode display according to the present exemplary embodiment emits light toward the substrate 110 to display an image.

An encapsulation thin film layer 260 including the first encapsulation thin film 261, the second encapsulation thin film 262, and the third encapsulation thin film 263 is formed on the common electrode 270. The first, second and third encapsulation thin films 261, 262, and 263 may be made of a group insulator or an organic insulator such as silicon oxide or silicon nitride. The encapsulation thin film layer 260 may encapsulate the organic light emitting member 370 and the common electrode 270 to prevent oxidation and to prevent moisture and / or oxygen from penetrating from the outside. That is, the third encapsulation thin film 263 covers the substrate 110 from the edge of the display panel 300 and completely seals the organic light emitting member 370 and the common electrode 270. As described above, by sealing and protecting the glass light emitting member 370 or the like using the plurality of thin films, the thickness of the organic light emitting display device may be further reduced, and display characteristics such as transmittance and viewing angle may be improved.

According to another embodiment of the present invention, the encapsulation thin film layer 260 may be formed of a single layer, a double layer, or four or more layers made of an inorganic insulator or an organic insulator.

The planarization layer 240 is formed on the encapsulation thin film layer 260. The planarization layer 240 may be made of an organic material or the like, and planarize the surface on the encapsulation thin film layer 260.

The lower transparent conductive film 232, the insulating layer 220, and the upper transparent conductive film 231 are sequentially formed on the entire surface of the planarization film 240.

The lower and upper transparent conductive layers 232 and 231 may be made of a transparent conductive material such as ITO, antimony tin oxide (ATO), or IZO. The lower transparent conductive layer 232 may receive a predetermined voltage such as a reference voltage Vr, and the upper transparent conductive layer 231 may be connected to the sensing signal line SL.

The insulating layer 220 may be made of an inorganic insulator or an organic insulator such as silicon oxide or silicon nitride, and may be formed by spin coating or printing.

The lower transparent conductive layer 232 and the upper transparent conductive layer 231 together with the insulating layer 220 form a reference capacitor Cr.

On the upper transparent conductive layer 231, a surface insulating layer 210, which may be made of an inorganic insulator such as silicon oxide or silicon nitride, an organic insulator, or the like is coated on the entire surface. The upper surface or outer contact material of the surface insulating layer 210 forms a variable capacitor Cv together with the upper transparent conductive film 231, and the upper surface or outer contact material of the surface insulating layer 210 and the upper transparent conductive film ( Between 231, surface insulating layer 210 functions as a dielectric.

3 and 4, when external contact is made with a finger Fn on a portion of the surface insulating layer 210, the voltage of the upper transparent conductive film 231, that is, the reference capacitor Cr and the variable capacitor The magnitude of the contact voltage Vn between (Cv) changes. Alternatively, the capacitance of the variable capacitor Cv may be changed at the contact portion to change the voltage Vn of the upper transparent conductive film 231. In this case, the surface insulation may be performed when the pressure is applied to the surface insulating layer 210 by the contact. The thickness of the layer 210 may be varied to change the capacitance of the variable capacitor Cv. Then, the magnitude of the voltage Vn of the upper transparent conductive film 231 varies depending on the magnitude of the capacitance of the variable capacitor Cv. The changed voltage Vn of the upper transparent conductive layer 231 flows through the sensing signal line SL as a sensing signal, and based on this, it may be determined whether a contact is made. This sensing operation is performed separately from the display operation described above, and is not influenced by each other.

According to another embodiment, a conductive film (not shown) may be further formed on the surface insulating layer 210. In addition, a coating film (not shown) may be further formed on the surface insulating layer 210 to protect the upper transparent conductive film 231 and reduce noise.

Next, an organic light emitting display device having a touch sensing function according to another exemplary embodiment of the present invention will be described with reference to FIGS. 5 to 7.

5 and 6 are cross-sectional views of one pixel of an organic light emitting display device having a touch sensing function according to an embodiment of the present invention, and FIG. 7 is an organic light emitting display having a touch sensing function according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a connection relationship between high frequency sensors in a display device.

5 and 6, an organic light emitting diode display having a touch sensing function according to an exemplary embodiment has a cross sectional structure substantially the same as that of the organic light emitting diode display illustrated in FIG. 3. The same description as in the previous embodiment is omitted, and the same components are given the same reference numerals.

Referring to FIG. 5, a gate conductor including a control electrode 124, a gate insulating layer 140, a plurality of semiconductors 154, a plurality of pairs of ohmic contacts 163 and 165, and driving are disposed on an insulating substrate 110. The plurality of data conductors including the voltage line 172 and the output electrode 175, the lower passivation layer 180p and the upper passivation layer 180q, the plurality of pixel electrodes 191, the partition wall 360, and the organic light emitting member 370. , The encapsulation thin film layer 260 including the common electrode 270, the first encapsulation thin film 261, the second encapsulation thin film 262, and the third encapsulation thin film 263, the planarization film 240, and the transparent conductive film ( 232a) is formed.

1 and 7, a plurality of island electrode parts 233 are formed at four corners of the display panel 300 of the organic light emitting diode display according to the present exemplary embodiment. The island electrode part 233 is connected to four corners of the transparent conductive film 232a, and has an island electrode (not shown) and a modified high frequency signal that can transmit a high frequency signal or a predetermined voltage to the transparent conductive film 232a. Or it may include a signal receiver (not shown) that can sense the voltage.

Near the edge of the display panel 300, a linear signal line pattern 80 may be formed of a metal such as silver or aluminum. The signal line pattern 80 connects four island-shaped electrode portions 233, and an end thereof is connected to the sensing signal processor 800. The signal line pattern 80 may be formed on the transparent conductive layer 232a.

In the organic light emitting diode display, a high frequency signal or a voltage is applied to the entire transparent conductive film 232a through an island electrode (not shown) of the island electrode unit 233. When an external object such as a finger Fn contacts the transparent conductive film 232a, a high frequency signal is deformed or an applied voltage is changed, and a signal such as the deformed high frequency signal is a signal receiver (not shown) of the island electrode 233. Not detected). The detected signal may be input to the detection signal processor 800 and the contact determiner 900 through the signal line pattern 80 to determine the contact position.

In contrast, referring to FIG. 6, the organic light emitting diode display having the touch sensing function according to another exemplary embodiment of the present invention may include the lower transparent conductive layer 232 instead of the transparent conductive layer 232a of the organic light emitting diode display of FIG. 5. The insulating layer 220, the upper transparent conductive film 231, and the coating film 215 are further formed on the lower transparent conductive film 232. The coating layer 215 may protect the upper transparent conductive layer 231 from contamination and external influences.

6 and 7, the lower transparent conductive film 232 and the upper transparent conductive film 231 are connected to an island electrode (not shown) of the island electrode part 233 to apply a high frequency signal or a predetermined voltage. In response, the high frequency signal or voltage modified by the contact is sensed by a signal receiver (not shown) of the island type electrode unit 233. In addition, the features of the organic light emitting diode display illustrated in FIGS. 5 and 7 may be applied to the organic light emitting diode display illustrated in FIGS. 6 and 7.

Various features of the OLED display having the touch sensing function illustrated in FIG. 3 may also be applied to the OLED display illustrated in FIGS. 5 and 6.

The sensing method of the organic light emitting diode display according to the exemplary embodiment of the present invention is a part of the touch sensing method, and may include a touch sensing unit of various sensing methods such as a capacitive method.

As described above, according to the exemplary embodiment of the present invention, the organic light emitting diode and the thin film transistor of the organic light emitting diode display are encapsulated by using various encapsulation thin films, and a touch sensing unit such as a capacitive thin film is formed thereon to provide a touch sensing function. The thickness of the organic light emitting display device can be reduced, and display characteristics such as transmittance and viewing angle can be improved.

The present invention can be applied to organic light emitting display devices having various structures.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

110: insulating substrate 121: scanning signal line
124: control electrode 140: gate insulating film
154: semiconductors 163 and 165: ohmic contacts
171: data line
172: driving voltage line 173: input electrode
175: output electrode 180p, 180q: protective film
185: contact hole 191: pixel electrode
210, 220: insulating layer 240: planarization film
231 and 232: transparent conductive film
260, 261, 262, 263: encapsulation thin film (layer)
270: common electrode 300: display panel
360: partition 370: organic light emitting member
400: scan driver 500: data driver
800: detection signal processing unit 900: contact determination unit
Fn: finger, contact object Cv: variable capacitor
Cr: reference capacitor Cst: retention capacitor
ILD: output current LD: organic light emitting element
PX: pixel Qs: switching transistor
Qd: driving transistor

Claims (28)

Board,
A thin film transistor positioned on the substrate,
A pixel electrode electrically connected to the thin film transistor,
A partition defining an opening positioned on the pixel electrode,
An organic light emitting layer including a portion located in the opening;
A common electrode on the barrier rib and the organic light emitting layer,
At least two encapsulation layers on the common electrode,
A first planarization layer planarizing an uneven top surface of at least one of said at least two encapsulation layers, and
A touch sensing unit formed on the first planarization layer
Including,
The at least two encapsulation layers include at least one inorganic layer including silicon oxide or silicon nitride,
The touch sensing unit includes a capacitive conductive layer,
The first planarization layer is positioned between the contact sensing unit and the at least two encapsulation layers.
OLED display. In claim 1,
The at least two encapsulation layers include three encapsulation layers. In claim 2,
And a second planarization layer disposed between the pixel electrode and the substrate. In claim 3,
The common electrode includes a transparent conductive material. In claim 4,
The pixel electrode, the organic emission layer, and the common electrode together form an organic light emitting element,
The organic light emitting diode may emit light toward the touch sensing unit.
OLED display. In claim 5,
The touch sensing unit includes a first conductor. In claim 6,
The touch sensing unit further includes a second conductor positioned on the first planarization layer. In claim 7,
And an insulating layer on the first planarization layer. Board,
A thin film transistor positioned on the substrate,
A pixel electrode electrically connected to the thin film transistor,
A partition defining an opening positioned on the pixel electrode,
An organic light emitting layer including a portion located in the opening;
A common electrode on the barrier rib and the organic light emitting layer,
At least two encapsulation layers on the common electrode,
A first layer disposed on the at least two encapsulation layers, the first layer comprising a lower surface and a top surface that is flatter than the bottom surface;
A touch sensing unit comprising a first capacitive conductive layer, and
A sensing signal line electrically connected to the first capacitive conductive layer and extending parallel to one edge of the substrate
Including,
The at least two encapsulation layers include at least one inorganic layer,
The sensing signal line is formed on the first layer,
The first layer is located between the touch sensing unit and the at least two encapsulation layers.
OLED display. In claim 9,
The at least two encapsulation layers include three encapsulation layers. In claim 10,
And a planarization layer disposed between the pixel electrode and the substrate. In claim 11,
The common electrode includes a transparent conductive material. In claim 12,
The pixel electrode, the organic emission layer, and the common electrode together form an organic light emitting element,
The organic light emitting diode may emit light toward the touch sensing unit.
OLED display. In claim 13,
The touch sensing unit further includes a second capacitive conductive layer. The method of claim 14,
The organic light emitting diode display further comprises an insulating layer on the first layer. In claim 11,
And a sensing signal processor electrically connected to the sensing signal line. In claim 9,
And the sensing signal line is in direct contact with an upper surface of the first layer. The method of claim 17,
The at least two encapsulation layers include three encapsulation layers. The method of claim 18,
And a planarization layer disposed between the pixel electrode and the substrate. The method of claim 19,
The common electrode includes a transparent conductive material. Board,
A thin film transistor positioned on the substrate,
A pixel electrode electrically connected to the thin film transistor,
A partition defining an opening positioned on the pixel electrode,
An organic light emitting layer including a portion located in the opening;
A common electrode on the barrier rib and the organic light emitting layer,
At least two encapsulation layers on the common electrode,
An insulating layer formed on the at least two encapsulation layers,
A touch sensing unit including a first conductive layer formed on the insulating layer, and
A sensing signal line electrically connected to the first conductive layer and extending parallel to one edge of the substrate
Including,
The at least two encapsulation layers include at least two inorganic layers,
The first conductive layer is directly positioned on the insulating layer,
The sensing signal line is formed on the at least two encapsulation layers.
OLED display. The method of claim 21,
The at least two encapsulation layers include three encapsulation layers. The method of claim 22,
And the sensing signal line is formed on the substrate. The method of claim 23,
And a planarization layer disposed between the pixel electrode and the substrate. The method of claim 24,
The common electrode includes a transparent conductive material. The method of claim 25,
The pixel electrode, the organic emission layer, and the common electrode together form an organic light emitting element,
The organic light emitting diode may emit light toward the touch sensing unit.
OLED display. The method of claim 26,
The touch sensing unit further includes a second conductive layer. The method of claim 21,
And a sensing signal processor electrically connected to the sensing signal line.

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