KR102290120B1 - Organic light emitting display device with touch sensing function - Google Patents

Abstract

The present invention relates to an organic light emitting display device including a touch sensing function, and more particularly, the present invention relates to a touch electrode located on the same layer as the light blocking layer or a layer between the light blocking layer and the substrate, and a touch signal generated from the touch electrode. An organic light emitting display device including a touch control unit that is converted into a signal and provided to an external system is provided.

Description

Organic light emitting display device with touch sensing function {ORGANIC LIGHT EMITTING DISPLAY DEVICE WITH TOUCH SENSING FUNCTION}

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

As the information society develops, the demand for display devices for displaying images is increasing in various forms, and liquid crystal display devices (LCDs), plasma display devices, organic light emitting display devices ( Various types of display devices such as OLED: Organic Light Emitting Display Device) are being used. In addition, research on a touch panel that touches an image displayed on the display device for an interactive operation with the display device and confirms the result of the touch is active.

However, the touch panel needs to be configured separately from the display device or requires a process for coupling the touch panel to the inside of the display device, which complicates the process and increases cost in manufacturing the display device. Accordingly, it is necessary to implement a display panel that detects a touched position without complicating the process of the display panel.

Against this background, an object of the present invention is to provide an effect of sensing a touch using touch electrodes coupled in a display panel without a separate touch panel.

Another object of the present invention is to reduce the thickness of the display panel and increase the accuracy of touch sensing by coupling a touch electrode to the display panel instead of the external touch panel.

In order to achieve the above object, in one aspect, the present invention, a touch electrode located in the same layer as the light-shielding layer or a layer between the light-shielding layer and the substrate, converts a signal generated from the touch electrode into a touch signal to be transmitted to an external system. An organic light emitting display device including a touch control unit is provided.

In another aspect, the present invention provides an organic light emitting display device for driving or sensing a touch signal using a touch electrode made of the same material as a light blocking layer positioned under a circuit unit.

In another aspect, the present invention provides an organic light emitting display that detects a mutual capacitance type touch by including a Tx electrode and an Rx electrode intersecting an insulating layer on different layers in a layer located between the light blocking layer and the substrate. present the device.

As described above, the present invention provides an effect of sensing a touch using touch electrodes coupled in a display panel without a separate touch panel for touch recognition.

In the present invention, since the touch electrode for sensing a touch is made of the same material as the light blocking layer in the display panel, a touch can be accurately sensed with the touch electrode in the display panel without the need to separately form an electrode for recognizing a touch, so that the displayed image and This enables accurate touch sensing by reducing the error between touches.

The present invention can be implemented so that a separate power supply is not required for the stylus pen. When the present invention is applied, the existing EM touch device can be configured integrally with the panel of the display device without being configured separately. Accordingly, the thickness of the display panel can be reduced even including the touch function. On the other hand, since the position for sensing a touch is made in a portion close to the screen, the touch sensitivity is high and accurate touch sensing is possible.

The touch electrode for touch sensing in the display panel is formed of the same material as the light blocking layer, so defects in the process caused by configuring a separate touch circuit are eliminated. Because it recognizes it, it provides the effect of cost reduction by not producing a separate touch panel.

1 is a diagram showing the configuration of an EM type liquid crystal display device.
2 is a diagram showing the configuration of an EM type touch sensing device.
3 and 4 are views illustrating a cross-section of a liquid crystal display panel combined with a touch panel.
5 is a diagram showing the configuration of a display panel configured with an excitation coil for touch recognition by EM method according to an embodiment of the present invention.
6 is a diagram illustrating a configuration of an excitation coil positioned around two or more pixel regions.
7 is a diagram illustrating a cross-section of a display panel according to an exemplary embodiment of the present invention.
8 is a diagram illustrating Rx/Tx wiring for sensing a hand type touch according to an embodiment of the present invention.
9 is a view showing a cross-section of a display panel according to another embodiment of the present invention.
10 is a view showing a cross-section of a display panel according to another embodiment of the present invention.
11 is a view showing the configuration of a display device to which a touch electrode is coupled according to an embodiment of the present invention.
12 is a diagram illustrating a configuration of a touch electrode in a structure in which a thin film transistor and a light blocking layer are connected according to an embodiment of the present invention.
13 is a view showing a configuration in which a touch electrode is connected to a light blocking layer in a structure in which a thin film transistor and a light blocking layer are insulated according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It will be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

As a method of combining touch technology with a display device, there is an EM (electromagnetic) method. This generates a signal by combining an excitation coil (or magnetic coil), which is an embodiment of a touch electrode positioned on the display device, and a stylus pen, and senses a touch.

1 is a diagram showing the configuration of an EM type liquid crystal display device. Looking at the detailed configuration of the liquid crystal display device 10 , an EM plate 12 is positioned on the lower case 11 , and the liquid crystal display panel 13 and the upper case 14 are coupled thereon. . The external stylus pen 20 may provide an electrical signal to the EM plate 12 to detect a touch at a specific location within the display panel 13 .

2 is a diagram showing the configuration of an EM type touch sensing device. The excitation coil 32 is positioned on the touch sensing device 35 to which the liquid crystal display panel is coupled, and when the stylus pen 20 comes into contact to generate a magnetic field as shown in 41, the device 38 for controlling the excitation coil 32 ) detects the touched position of the stylus pen 20 as an electrical signal as shown in 42 and provides it to the host computer.

3 and 4 are views illustrating a cross-section of a liquid crystal display panel combined with a touch panel. 3 and 4, it is divided into a touch panel 50 and a liquid crystal display panel 13 for a touch operation. The touch panel 50 has a cover glass or a touch glass as shown in 51, and OCA (Optical Clear Adhesive) 52, 54 or OCR (Optical Clear Resin) 56 is provided below it. Located. In addition, the Rx electrode 61 and the Tx electrode 62 are positioned with the PET film 53 interposed therebetween as reception and transmission signals for a hand touch signal. And a protective PET film (Protective PET Film, 55) and a polarizing layer (POL, 57) are positioned. The liquid crystal display panel 13 is positioned under the touch panel 50 .

3 shows a cross-section in which the EM plate 12 is positioned under the liquid crystal display panel 13 . In FIG. 4 , the excitation coil 32 may be positioned on the side of the OCR 56 layer of the touch panel 50 . On the other hand, as described above, the touch panel 50 is coupled to the liquid crystal display panel 13, and in the EM method, as shown in FIGS. 3 and 4 , the EM plate 12 is coupled or the excitation coil 32 is coupled to the EM method. Allows for touch type.

However, the touch panel 50 positioned on the liquid crystal display panel 13 has its own thickness, thereby increasing the thickness of the entire display device. In addition, in order to implement EM and hand touch together, the cover glass 51 and touch films (OCA, OCR, etc.) are additionally required, which is the main cause of price, additional process, and thickness increase.

In order to implement a stylus pen and a hand touch for touch, each optimized device is required. EM plate (or excitation coil) sms only works with a specially designed stylus pen and cannot detect hand touch. Conversely, the panel for hand touch cannot recognize the dedicated stylus pen.

Meanwhile, in order to implement the EM method using a stylus pen, an EM plate or an excitation coil must be implemented on a touch panel on a liquid crystal display panel. Currently, these technologies are applied only to liquid crystal display panels.

Hereinafter, in the present invention, a structure necessary for touch recognition for an EM method and a hand touch method for an OLED display device is presented. To this end, in an embodiment of the present invention, an excitation coil for recognizing a stylus pen is formed in the display panel by using the light blocking layer on the same layer as the light blocking layer, without configuring a separate touch panel. In addition, a panel for hand touch can be designed using an insulating film and ITO. It is implemented as a capacitive method, and hand touch sensing is possible according to the change in capacitance that occurs at the intersection of the Rx electrode/Tx electrode during touch.

5 is a diagram showing the configuration of a display panel configured with an excitation coil for touch recognition by EM method according to an embodiment of the present invention. In FIG. 5 , the excitation coil is an embodiment of the touch electrode, and may be formed on the same layer or a different layer as the light blocking layer in a space in which wirings for a scan signal or a sense signal between pixel regions are located. The excitation coil may be configured in the form of a closed structure. In addition, the excitation coil may be formed on the same layer as the light blocking layer or a different layer in the space where the wirings to which EVDD or VREF is applied between the pixel regions are located.

Reference numeral 510 of FIG. 5 denotes a first touch sensing unit that detects a touch of the excitation coils 511a, 511b, and 511n positioned in the 501 direction. Reference numeral 520 denotes a second touch sensing unit that detects a touch of the excitation coils 521a, 521b, and 521m positioned in the 502 direction. The touch control unit 530 controls the first touch sensing unit 510 and the second touch sensing unit 520 to check the point where the stylus pen is touched, and provides it to the external system. That is, the stylus pen acts as one electrode, and a driving voltage (touch driving signal) is applied to the touch electrode and the excitation coils in two directions are sensed at the same time. In an embodiment, an AC current is sequentially flowed through a plurality of excitation coils, and a magnetic field is formed by the current, which is stored in the LC circuit inside the stylus. Then, the stored magnetic field is reflected back to the panel, and the current is sensed in the excitation coil by the reflected magnetic field and sensed. The LC circuit inside the stylus pen is designed to match the resonant frequency of the radiated frequency, so it can be detected only with a dedicated pen.

Looking closely at each pixel region 590 , it is composed of sub-pixels 591 and a circuit unit 592 . A light blocking layer for blocking light is formed under the circuit unit. The excitation coil of FIG. 5 is made of the same material as the light blocking layer and is positioned around the pixel region to provide a sensing function for touch recognition by the EM method. The arrangement of the excitation coil may be between pixel regions or between multiple pixel regions. This may be variously determined according to the resolution of the EM type touch recognition.

6 is a diagram illustrating a configuration of an excitation coil positioned around two or more pixel regions. When the intervals between the excitation coils 611a, 611b, 611n, 621a, 621b, and 621m are configured to be more than one pixel area, the number of excitation coils can be reduced. When the tip of the stylus pen is larger than the pixel area, the distance between the excitation coils can be increased.

5 and 6 , an excitation coil, which is a wiring for EM touch sensing, may be formed using the same material as the light blocking layer in a region through which wirings positioned between pixel areas pass. The light blocking layer may be made of a conductive material, and the excitation coil has an effect of blocking light incident on other wirings positioned between the pixel areas. On the other hand, when the light-shielding layer is made of the same material as the light-shielding layer and is formed on the same layer, there is no need to separately configure a mask for the touch electrode, and since the touch electrode can be disposed together in the process of forming the light-shielding layer, touch without increasing the process By forming an electrode, the process is shortened. In addition, when one mask is used, misalignment between the touch electrode and the display panel can be eliminated, thereby increasing the accuracy of the process.

Each excitation coil forms a closed structure, for example, a closed circuit, and since current must flow, a COF (Chip on Film) is formed on one side like 510 and 520 to transmit a driving waveform and provide a signal detection function due to touch. Also, as shown in FIG. 6 , the interval between the excitation coils is made wider than that of the pixels, so that the touch resolution can be set lower than the pixel resolution. Also, since the first touch sensing unit 510 and the second touch sensing unit 520 for sensing a touch are respectively located in the gate direction and the source direction, the number of pads may increase.

The excitation coil is made of the same material as the light blocking layer, but may be configured not to be positioned under the circuit unit in FIGS. 5 and 6 . When the excitation coil is formed between a plurality of pixel regions, even in the same region as the light blocking layer, an insulating state from the light blocking layer can be maintained. When the light blocking layer is connected to any one of the gate, source, and drain of the thin film transistor of the circuit unit, the excitation coil, which is a touch electrode, is configured to always maintain an insulated state from the light blocking layer. To this end, even when the touch electrode is formed on the same layer, the touch electrode may be formed to increase the distance apart from the light blocking layer. When the light blocking layer and the touch electrode are insulated to be spaced apart, the signal generated from the touch electrode does not affect the light blocking layer connected to the thin film transistor, so that the touch signal can be accurately sensed.

Meanwhile, in another embodiment, the touch electrode is formed of the same material as the light blocking layer, but the touch electrode and the light blocking layer may be located on different layers, and in particular, the touch electrode may be formed at a position that does not overlap the light blocking layer even in different layers. can Similarly, when the light blocking layer connected to the thin film transistor and the touch electrode are insulated and configured to be spaced apart, the signal generated from the touch electrode does not affect the light blocking layer. In particular, the light blocking layer and the touch electrode may be formed at a position where they do not cross even in different layers. In this case, an insulating layer, for example, a buffer layer, may be located between the light-shielding layer and the touch electrode. Even if the buffer layer is damaged during the process, a short circuit does not occur between the light-shielding layer and the touch electrode. It is possible to ensure the stability of the operation of the pixel area.

In another embodiment of the present invention, the touch electrode may be formed of the same material as the light blocking layer and placed on the same layer as the touch electrode, but the light blocking layer and the touch electrode may be connected. This can be applied when the light blocking layer is insulated from the gate, source, or drain of the thin film transistor, and the excitation coil and the light incident on the circuit parts composed of the thin film transistors and other wiring positioned between the pixel regions are applied. The layer has a blocking effect. In particular, when the light-shielding layer is made of the same material as the light-shielding layer and is formed on the same layer, there is no need to separately configure a mask for the touch electrode. By forming an electrode, the process is shortened. In addition, when one mask is used, misalignment between the touch electrode and the display panel can be eliminated, thereby increasing the accuracy of the process. Meanwhile, since the light-shielding layer and the touch electrode are connected and the light-shielding layer and the thin film transistor are insulated, even when the light-shielding layer and the region overlap in the process of forming the touch electrode, the touch signal can be stably driven and sensed.

7 is a diagram illustrating a cross-section of a display panel according to an exemplary embodiment of the present invention. Looking at a region in which a thin film transistor (or TFT) is formed on the substrate 200 , the light blocking layer 202 , the buffer layers 204 and 206 , the active layer 210 , and the gate insulating layer 215 . ), a gate 220 , and an interlayer dielectric (ILD) 225 are formed, and the interlayer insulating layer 225 is partially viewed to expose the activation layer 210 and the exposed activation layer 210 and The source/drain electrodes 230 contact each other. In addition, a passivation layer 235 , an overcoat layer 240 , and a bank 245 are formed. On the other hand, looking at the region where the color filter of the sub-pixel region is formed, a pixel electrode (or anode electrode or pixel electrode) 280 and an organic layer 285 are formed, and a cathode electrode (Cathode) ( 290) is located. The color filter 254 is formed with pigments of specific colors, such as red, green, and blue. In addition, a polarizing plate or a polarizing film 270 is formed under the substrate 200 .

In the configuration of FIG. 7 , an excitation coil for EM touch may be formed on the same layer as 730 using the same material as the light blocking layer 202 . The excitation coil is made of the same material as the light blocking layer, and may be formed in a pixel or between a pixel and a pixel. Therefore, the excitation coil of the same material as that of the light blocking layer is not included in all pixels, but the excitation coil may be positioned in a specific direction as shown in FIG. 7 only in some pixels. Previously, in FIGS. 5 and 6 , excitation coils 511, 521, 611, and 621 were described as being formed between some pixels or included in some pixels.

In FIG. 7 , the light blocking layer 202 and the excitation coil 730 may be electrically connected or insulated. When the light blocking layer 202 is connected to the gate 220 or the source or drain 230 of the thin film transistor, the excitation coil 730 may be electrically insulated from the light blocking layer 202 . In another embodiment, the light blocking layer 202 and the excitation coil 730 may be formed on different layers. A coil 730 may be formed.

5, 6, and 7, examples in which the same material as the light blocking layer is included in the organic light emitting display device as the material of the excitation coil for sensing the EM type touch have been described. In addition, an organic light emitting display device in which Rx/Tx capable of recognizing a hand touch is combined will be described.

8 is a diagram illustrating Rx/Tx wiring for sensing a hand type touch according to an embodiment of the present invention. For convenience of description, pixels are omitted from the drawings. A plurality of pixels may be positioned between the excitation coils for sensing the EM type touch. It is a view including Rx electrodes 821a, 821b, ..., 821r and Tx electrodes 811a, 811b, ..., 811t in addition to the configuration of FIG. 6 . Since the Rx/Tx electrode may also be formed between a plurality of pixels, it may be formed adjacent to only a specific pixel.

In FIG. 8 , a driving voltage is applied to the Tx electrode (also referred to as a driving electrode). The Rx electrode (also referred to as the sensing electrode), which is an electrode in the other direction, senses the driving voltage and forms a capacitance with the Tx electrode, thereby reducing the change in capacitance (mutual capacitance) between the Tx electrode and the Rx electrode depending on the presence or absence of a pointer such as a finger. Based on the touch presence, touch coordinates, etc. are detected. The first touch sensing unit 810 applies a driving voltage, and the second touch sensing unit 820 senses the driving voltage. The touch control unit 830 controls the first touch sensing unit 810 and the second touch sensing unit 820 to check a point where a pointer such as a finger is touched, and provides it to an external system.

9 is a view showing a cross-section of a display panel according to another embodiment of the present invention. It is a view in which additional components for forming the Rx/Tx electrode are formed in the configuration of FIG. 7 . An insulating layer 203 is added to form the Rx/Tx electrodes in different layers. The insulating layer is a buffer layer as an embodiment. In addition, it can be seen that the Rx electrode 920 and the Tx electrodes 910a and 910b are formed adjacent to or overlapping the circuit portion of the pixel. The Rx electrode 920 is an embodiment of the Rx electrodes 821a, 821b, ..., 821r of FIG. 8 . The Tx electrodes 910a and 910b are examples of the Tx electrodes 811a, 811b, ..., 811t of FIG. 9 . The Tx/Rx electrodes are made of ITO material in one embodiment.

FIG. 10 is a view showing a configuration in which the touch electrode 730 is positioned on a layer different from the light blocking layer in the structure of FIG. 7 . The touch electrode 730 positioned on a different layer from the light blocking layer and formed of the same material as the light blocking layer may sense the EM type touch. Since the touch electrode 730 made of the same material as the light blocking layer is formed on a different layer from the light blocking layer, it may be configured to overlap the light blocking layer or not to overlap the light blocking layer. When the light blocking layer is connected to the thin film transistor, it may be configured not to overlap the light blocking layer in order to prevent a short circuit.

The first touch sensing unit 510 and the second touch sensing unit 520 or the first touch sensing unit 810 and the second touch sensing unit 820 may be connected in a first direction or a second direction parallel to the data line or the gate line. A touch signal may be sensed by controlling the touch electrode or the Rx/Tx electrode formed in the direction. 5 and 6 as an embodiment, each touch sensing unit controls a plurality of touch electrodes having a closed loop structure. In an embodiment, the first touch sensing units 510 and 810 sense touch signals from a plurality of touch electrodes having a closed-loop structure in the first direction or the second direction, and the second touch sensing units 520 and 820 are A touch signal is sensed from a plurality of touch electrodes having a closed-loop structure in two directions or a first direction. In addition, the touch electrode having a closed loop structure may have a closed loop structure including one or more pixel regions. On the other hand, when controlling the Rx/Tx electrode, the first touch sensing unit 810 applies a driving voltage to the Tx electrode, and the second touch sensing unit 820 senses the driving voltage at the Rx electrode. Since each touch sensing unit may be configured by being connected to a gate pad or a data pad, a separate configuration for the touch sensing unit is not required and the size of the display panel is not increased. In addition, the touch controllers 530 and 830 may also be configured in combination with a timing controller. Since the touch sensing unit and the touch control unit are configured parallel to the data line and the gate line, they are combined with the gate driving unit and the data driving unit of the existing display panel. It is possible to increase the accuracy of touch sensing by integrating and controlling.

11 is a view showing the configuration of a display device to which a touch electrode is coupled according to an embodiment of the present invention.

The display device 1100 according to the exemplary embodiment includes a display in which m data lines (DL1, ... , DLm, m: natural numbers) and n gate lines (GL1, ... , GLn, n: natural numbers) are formed. The panel 1110, the first driver 1120 for driving the m data lines DL1, ..., DLm, and the second driver 1120 for sequentially driving the n gate lines GL1, ..., GLn and a timing controller 1140 for controlling the driving unit 1130 , the first driving unit 1120 , and the second driving unit 1130 . In the display panel 1110 , pixels (P: Pixels) may be formed at points where m data lines DL1 , ... , DLm and n gate lines GL1 , ... , GLn intersect with each other. there is. In addition, as described above, touch electrodes EC1, ..., ECp. ECq, ..., ECs for EM type touch are formed on the display panel 1110 . In addition, the Rx electrode and the Tx electrode for the hand touch method are respectively formed as Rx1, ..., Rxr, and Tx1, ..., Txt and are in the display panel 1110 . The function of the touch sensing unit to apply a touch driving voltage to the touch electrode, the Rx electrode, and the Tx electrode or to sense the driving voltage is provided by the first driving unit 1120 and the second driving unit 1130 .

The timing controller 1140 may control the first driver 1120 and the second driver 1130 to check the sensed touch position. The function of the touch control unit is additionally included. In addition, the timing controller 1140 starts scanning according to the timing implemented in each frame, and converts the image data input from the interface according to the data signal format used by the data driver 1120 to convert the converted image data (Data). It outputs and controls the data operation at an appropriate time according to the scan.

The timing controller 1140 controls the first driver 1120 and the second driver 1130 , such as a data control signal (DCS), a gate control signal (GCS), and the like. signal can be output. In addition, the first driver 1120 and the second driver 1130 apply a driving voltage to the touch electrodes EC1, ..., ECp. ECq, ..., ECs composed of the excitation coil, or the Tx electrode ( A driving voltage may be applied to Tx1, ..., Txt). In addition, the driving voltage may be sensed from the Rx electrodes Rx1, ..., Rxr.

In order to control the other pixels of the display panel 1110 , the second driver 1130 transmits a scan signal of an on voltage or an off voltage to the n gate lines according to the control of the timing controller 1140 . (GL1, ..., GLn) are sequentially supplied to sequentially drive n gate lines GL1, ..., GLn.

The first driver 1120 stores the input image data in a memory (not shown) under the control of the timing controller 1140 , and when a specific gate line is opened, the image data Data is converted into an analog form. The m data lines DL1, ..., DLm are driven by converting the data voltage Vdata of

The first driver 1120 may include a plurality of data driving integrated circuits (Data Driver ICs, also referred to as source driver ICs). It may be connected to a bonding pad of the display panel 110 by a Tape Automated Bonding (TAB) method or a chip-on-glass (COG) method or may be directly formed on the display panel 1110. In some cases, the display panel It may be formed by being integrated in 1110 .

The second driver 1130 may include a plurality of gate driver ICs. The plurality of gate driver ICs may include a tape automated bonding (TAB) method or a chip-on-glass method. It may be connected to a bonding pad of the display panel 1110 in a (COG) method, or may be implemented as a GIP (Gate In Panel) type and directly formed on the display panel 1110. In some cases, the display panel ( 110) may be integrated and formed.

The above-described timing controller 1140 is also called a control board (Control Board, CPCB (Control Printed Circuit Board)) connected to a source board (also called a Source Board, SPCB (Source Printed Circuit Board)) and a connector to which a data driving integrated circuit is connected. ) can be placed in A circuit element such as at least one transistor is formed in each pixel P of the display panel 1110 .

For example, when the display panel 1110 is the organic light emitting display panel 110 , each pixel P includes one organic light emitting diode, two or more transistors, and one or more A circuit element such as a capacitor is formed.

12 is a diagram illustrating a configuration of a touch electrode in a structure in which a thin film transistor and a light blocking layer are connected according to an embodiment of the present invention. As shown in 1201 , the drain 230 of the thin film transistor is connected to the light blocking layer 202 . Accordingly, the light blocking layer 202 and the touch electrodes 730a and 730b are insulated. Meanwhile, the touch electrode 730a may be positioned on the same layer as the light blocking layer 202 , or the touch electrode 730b may be positioned on a different layer.

13 is a view showing a configuration in which a touch electrode is connected to a light blocking layer in a structure in which a thin film transistor and a light blocking layer are insulated according to another embodiment of the present invention. Since the thin film transistor and the light blocking layer are insulated, the touch electrode 730 and the light blocking layer 202 may be connected as one. In this case, since the touch electrode 730 is further expanded by the area of the light blocking layer, the recognition of the stylus pen may be refined. The touch electrode 730 may have a closed-loop structure including a variable number of pixel areas according to precision. Among them, when connected to the light blocking layer of some pixel areas, the width of the touch electrode increases as much as the light blocking layer. As a result, the area in which the touch electrode can detect the signal of the stylus pen is increased, so that the accuracy of touch sensing can be improved.

5 to 13, the excitation coil can be designed using a light shield layer for preventing device deterioration of the activation layer in the OLED thin film transistor structure. In this case, the closer the coil is formed in the panel by narrowing the gap, the more magnetic fields can be emitted, so that the energy of the stylus pen can be stored at a longer distance. In addition, as shown in FIG. 9 , wirings are formed to cross each other using ITO on the insulating layer so that a hand touch can be sensed. This makes it possible to sense a touch according to a change in capacitance when a touch is made with an object such as a hand in a capacitive manner. Since the touched portion is the upper portion of the polarizing plate or the polarizing film 270 , the touch can be sensed at a very close distance, so that strong touch sensing against noise is possible.

5, 6, 7, 10, 12, and 13, when the EM type touch is combined, the excitation coil, which is the touch electrode, may be formed on the same layer as the light blocking layer and made of the same material. Alternatively, the layer between the light blocking layer and the substrate may be formed of the same material as the light blocking layer. In this case, since the excitation coil is included in the display panel, a touch sensing function can be provided without the need to combine a separate touch panel with the display panel.

As described above, an embodiment of the present invention provides a display device capable of EM type touch sensing using a light blocking layer in an OLED TFT structure. In an embodiment, the light-shielding layer is formed of an excitation coil that is a touch electrode. In this case, the touch electrode can be designed by separating it from the light-shielding layer region formed under the element constituting the activation layer. In addition, the touch electrode may be formed on the same layer as the light blocking layer, and the touch electrode may be formed on a layer different from the light blocking layer. In the case of a single layer, it is possible to prevent cross between the light blocking layer connected through the hole with the thin film transistor such as the gate wiring and the touch electrode. In addition, in another embodiment of the present invention, the Tx electrode and the Rx electrode, which are touch electrodes using mutual capacitance, may be formed using a transparent metal such as ITO, and since ITO is used, a decrease in transmittance can be avoided. Again, the Rx electrode and the Tx electrode can be designed as two layers or one layer.

Meanwhile, in the EM type touch according to an embodiment of the present invention, the frequency supplied to the coil, which is the touch electrode, may be configured to be the same as the resonance frequency of the LC circuit inside the stylus pen serving as a pointer from the outside. In addition, the present invention can be implemented so that a separate power supply is not required for the stylus pen. When the present invention is applied, the existing EM touch device can be configured integrally with the panel of the display device without being configured separately. Accordingly, the thickness of the display panel can be reduced even including the touch function. On the other hand, since the position for sensing a touch is made in a portion close to the screen, the touch sensitivity is high and accurate touch sensing is possible.

Terms such as "include", "compose" or "have" described above mean that the corresponding component may be embedded unless otherwise stated, so it does not exclude other components. It should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

In addition, the foregoing description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains to the extent that it does not depart from the essential characteristics of the present invention. Various modifications and variations such as combining, separating, substituting and altering will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: liquid crystal display 20: stylus pen
510, 810: first touch sensing unit 520, 820: second touch sensing unit
530, 830: touch control unit 130: gate driver
511, 521, 611, 621, 730: touch electrode
811, 910: Tx electrode 821, 920: Rx electrode

Claims (8)

a data line positioned in a first direction and a gate line positioned in a second direction on a substrate, and a plurality of pixel regions defined at intersections of the data line and the gate line;
a plurality of circuit units controlling light emission of the organic light emitting device in the pixel region and having one or more thin film transistors connected to the gate line and the data line;
an excitation coil made of the same material as the light blocking layer positioned below the circuit unit to block light, and located in the same layer as the light blocking layer or between the light blocking layer and the substrate to generate a magnetic field; and
and a touch controller that converts the signal generated by the excitation coil into a touch signal and provides it to an external system.
delete According to claim 1,
The light blocking layer is connected to the thin film transistor of the circuit part, and the excitation coil is insulated from the light blocking layer.
According to claim 1,
The light blocking layer and the excitation coil are located on different layers,
The light blocking layer is connected to the thin film transistor, and the excitation coil is insulated from the light blocking layer.
According to claim 1,
The light blocking layer and the excitation coil are located on the same layer,
The light blocking layer is insulated from the thin film transistor, and the excitation coil is connected to the light blocking layer.
According to claim 1,
The organic light emitting display device includes a first touch sensing unit and a second touch sensing unit,
The first touch sensing unit senses a touch signal from an excitation coil having a closed loop structure in a first direction, and the second touch sensing unit senses a touch signal from an excitation coil having a closed loop structure in a second direction,
The organic light emitting diode display device according to claim 1, wherein the excitation coil of the closed loop structure has a closed loop structure including at least one pixel area.
According to claim 1,
A layer positioned between the light blocking layer and the substrate includes:
It further includes a Tx electrode and an Rx electrode positioned to cross each other with an insulating layer interposed therebetween,
The touch control unit applies a driving voltage to the Tx electrode and senses the driving voltage at the Rx electrode.

According to claim 1,
The organic light emitting display device, characterized in that the frequency of the signal supplied to the excitation coil generating the magnetic field is the same as the resonance frequency inside the stylus pen.

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