Light-emitting display device

Abstract

To provide a light-emitting display device in which a data driver can sense an overcurrent flowing in through a chip-on film.SOLUTION: A light-emitting display device includes: a power supply unit which supplies power to a light-emitting display panel provided with light-emitting elements; a printed circuit board on which the power supply unit and a controller driver are mounted; a chip-on-film connected between the printed circuit board and the light-emitting display panel: a data driver provided on the chip-on-film; a low voltage line that extends from the printed circuit board to the light-emitting display panel through the chip-on-film and is connected to the light-emitting elements; a main low-voltage line provided on the printed circuit board, connected to the low-voltage line, and connected to the power supply unit; and a sensing capacitor connected to the main low-voltage line so as to support the data driver. Each sensing capacitor is connected to the data driver.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a light-emitting display device.

Background Art

[0002] A light-emitting display device is mounted on an electronic product such as a television, a monitor, a notebook computer, a smartphone, a tablet computer, an electronic pad, a wearable device, a watch phone, a portable information device, a navigation device, or a vehicle control display device, and performs a function of displaying an image.

[0003] A light-emitting display device performs a function of outputting light by itself and displaying an image.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a light-emitting display device, current flows through a chip-on-film (COF) on which a data driver is mounted to a light-emitting display panel. In this case, if a crack occurs in the light-emitting display panel, a short circuit or the like may occur in the cracked portion, generating heat, and as a result, a phenomenon in which the light-emitting display panel burns may occur. Various protection functions have been applied to conventional light-emitting display devices to protect against such a phenomenon.

[0005] However, in a conventional light-emitting display device, current may concentrate on a chip-on-film (COF) on which a data driver is mounted, generating heat at the connection portion between the light-emitting display panel and the chip-on-film (COF), and as a result, a problem may occur in which the chip-on-film (COF) burns or melts. That is, the inventor of the present specification recognized that conventional light-emitting display devices do not have a function of solving the problem that current concentrates on the chip-on-film (COF) and the chip-on-film (COF) is damaged.

[0006] Therefore, the inventors of the present specification have invented a light emitting display device capable of sensing the phenomenon in which an overcurrent flows through a chip-on-film (COF).

[0007] SUMMARY OF THE DISCLOSURE An object of the present disclosure is to provide a light emitting display device in which a data driver can sense an overcurrent flowing through a chip on film. [Means for solving the problem]

[0008] An emissive display device according to one embodiment of the present specification includes a power supply unit that supplies power to a emissive display panel having a light-emitting element, a printed circuit board on which the power supply unit is provided, a chip-on-film connected between the printed circuit board and the emissive display panel, a data driver provided on the chip-on-film, a low voltage line extending from the printed circuit board through the chip-on-film to the emissive display panel and connected to the light-emitting element, a main low voltage line provided on the printed circuit board, connected to the low voltage line and connected to the power supply unit, and a sensing capacitor connected to the main low voltage line corresponding to the data driver, each of the sensing capacitors being connected to the data driver.

[0009] Specific matters according to various examples of the present specification other than the means for solving the problems mentioned above are included in the following description and drawings. Effect of the Invention

[0010] According to the present specification, the data driver can sense the overcurrent flowing through the chip-on-film, thereby detecting the chip-on-film where the overcurrent occurs. When the chip-on-film where the overcurrent occurs is detected, the control driver can transmit an overcurrent detection signal to an external system.

[0011] This allows the user to take appropriate measures before the chip-on-film is burned or melted due to an overcurrent, thereby preventing the problem of the light emitting display device being damaged by an overcurrent.

[0012] According to the present specification, the overcurrent passing through the chip-on-film can be sensed by the data driver, thereby improving the accuracy of the overcurrent sensing. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating a configuration of a light-emitting display device according to the present specification; [Diagram 2] 1 is a diagram illustrating a structure of a pixel applied to a light-emitting display device according to the present specification; [Diagram 3] 1 is a diagram illustrating a structure of a control driver applied to a light emitting display device according to the present specification; [Figure 4] 2 is a diagram illustrating one of data drivers, a sensing capacitor, and a light-emitting display panel that are applied to a light-emitting display device according to the present specification; [Diagram 5] 1 is a diagram illustrating a configuration of a data driver applied to a light-emitting display device according to the present specification; [Figure 6] 10A to 10C are diagrams illustrating a configuration of a sensing unit applied to a light emitting display device according to the present specification; [Figure 7] 1 is a diagram illustrating a configuration example of a power supply unit applied to a light-emitting display device according to the present specification. [Figure 8] 1 is a flowchart illustrating an embodiment of a method for operating a light emitting display device according to the present disclosure. [Figure 9] 9 is a diagram illustrating signals used in the operation method shown in FIG. 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The advantages and features of the present specification, as well as the methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, and may be embodied in various different forms, and the embodiments are provided solely for the purpose of making the disclosure of the present specification complete and fully conveying the scope of the invention to those skilled in the art to which the present specification pertains.

[0015] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the figures for explaining the embodiments of this specification are illustrative, and the specification is not limited to the matters shown in the figures. The same reference numbers refer to the same components throughout the specification. In addition, in the description of this specification, if it is determined that a specific description of related known technology may unnecessarily obscure the gist of this specification, the detailed description will be omitted. When "including," "having," "consisting of," etc. are used in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, it includes the case where it includes a plurality, unless otherwise expressly stated.

[0016] In interpreting elements, an error range is to be interpreted as being included even if there is no separate explicit description of the error range.

[0017] When the description is of a positional relationship, e.g. when the positional relationship of two parts is described using "above", "at the top", "below", "beside", etc., one or more other parts may be located between the two parts, unless, e.g., "immediately" or "directly" is used.

[0018] When describing a temporal relationship, if the temporal precedence is described using "after", "following", "next to", "before", etc., it can also include cases where the relationship is not consecutive, unless "immediately" or "directly" is used.

[0019] The terms such as "first", "second", etc. are used to describe various components, but these components are not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical concept of this specification.

[0020] In describing the components of this application, terms such as "first", "second", "A", "B", "(a)", "(b)", etc. can be used. Such terms are only for distinguishing the component from other components, and the nature, order, sequence, or number of the corresponding components are not limited by the terms. When one component is described as "connected", "coupled", or "joined" to another component, that component can be directly connected or joined to the other component, but it should be understood that other components can "intervene" between the components that can be indirectly connected or joined, unless otherwise explicitly stated.

[0021] "At least one" should be understood to include all combinations of one or more of the related components. For example, the meaning of "at least one of the first, second, and third components" can mean not only the first, second, or third component alone, but also all combinations of two or more of the first, second, and third components.

[0022] The features of each of several embodiments in this specification can be partially or wholly combined or combined with each other, and various interlocks and drives are technically possible. Each embodiment can be implemented independently of each other or implemented together in relation to each other.

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The scale of the components shown in the drawings has a scale different from the actual one for the convenience of explanation, and thus is not limited to the scale shown in the drawings.

[0024] FIG. 1 is an exemplary diagram showing the configuration of the light-emitting display device according to the present specification, FIG. 2 is an exemplary diagram showing the structure of a pixel applied to the light-emitting display device according to the present specification, and FIG. 3 is an exemplary diagram showing the structure of a control driver applied to the light-emitting display device according to the present specification.

[0025] The light-emitting display device according to the present specification can constitute various electronic devices. The electronic device can be, for example, a smartphone, a tablet PC, a television, a monitor, or the like.

[0026] As shown in FIG. 1, the light-emitting display device according to the present specification includes a light-emitting display panel 100 including a display area (DA) where an image is output and a non-display area (NDA) provided outside the display area (DA), a gate driver 200 that supplies a gate signal (GS) to gate lines (GL1 to GLg) provided in the display area (DA) of the light-emitting display panel 100, a data driver 300 that supplies a data voltage (Vdata) to data lines (DL1 to DLd) provided in the light-emitting display panel 100, a control driver 400 that controls the driving of the gate driver 200 and the data driver 300, and a power supply unit 500 that supplies power to the control driver 400, the gate driver 200, the data driver 300, and the light-emitting display panel 100. Further, the light-emitting display device according to the present specification includes a printed circuit board 700 on which the power supply unit 500 and the control driver 400 are mounted, a chip-on-film 600 connected between the printed circuit board 700 and the light-emitting display panel 100, a low-voltage line 20 extending from the printed circuit board 700 through the chip-on-film 600 to the light-emitting display panel 100 and connected to a light-emitting element (ED), a main low-voltage line 10 provided on the printed circuit board 700, connected to the low-voltage line 20, and insulated from the power supply unit 500, and a sensing capacitor 800 connected to the main low-voltage line 10 so as to correspond to the data driver 300. Each of the sensing capacitors 800 is connected to the data driver 300.

[0027] First, the light-emitting display panel 100 includes a display area (DA) and a non-display area (NDA). The display area (DA) includes gate lines (GL1 to GLg), data lines (DL1 to DLd), and pixels (P). Therefore, an image is output in the display area (DA). g and d are natural numbers. The non-display area (NDA) encompasses the outer periphery of the display area (DA).

[0028] A pixel (P) provided in the light emitting display panel 100 may include a pixel driving circuit (PDC) including a switching transistor (Tsw1), a storage capacitor (Cst), a driving transistor (Tdr) and a sensing transistor (Tsw2), and a light emitting element (ED) connected to the pixel driving circuit (PDC), as shown in FIG.

[0029] A first terminal of the driving transistor Tdr may be connected to a high voltage line 30 to which a high voltage EVDD is supplied, and a second terminal of the driving transistor Tdr may be connected to the light emitting element ED.

[0030] A first terminal of the switching transistor (Tsw1) is connected to the data line (DL), a second terminal of the switching transistor (Tsw1) is connected to the gate of the driving transistor (Tdr), and the gate of the switching transistor (Tsw1) can be connected to the gate line (GL).

[0031] A data voltage (Vdata) is supplied from the data driver 300 through a data line (DL). A gate signal (GS) is supplied from the gate driver 200 through a gate line (GL). The gate signal (GS) includes a gate pulse (GP) for turning on the switching transistor (Tsw1) and a gate-off signal for turning off the switching transistor (Tsw1).

[0032] A sensing transistor (Tsw2) may be provided to measure a threshold voltage or mobility of the driving transistor (Tdr) or to supply a reference voltage (Vref) to the pixel driving circuit (PDC). A first terminal of the sensing transistor (Tsw2) is connected to a second terminal of the driving transistor (Tdr) and the light emitting element (ED), a second terminal of the sensing transistor (Tsw2) is connected to a sensing line (SL) to which the reference voltage (Vref) is supplied, and a gate of the sensing transistor (Tsw2) may be connected to a sensing control line (SCL) to which a sensing control signal (SCS) is supplied.

[0033] The sensing line (SL) may be connected to the data driver 300, and may be connected to the power supply unit 500 through the data driver 300. That is, the reference voltage (Vref) provided from the power supply unit 500 may be provided to the pixel (P) through the sensing line (SL), and the data sensing signal transmitted from the pixel (P) may be processed by the data driver 300.

[0034] The light emitting element (ED) includes a first electrode to which a high voltage (EVDD) is supplied through a driving transistor (Tdr), a second electrode connected to a low voltage line 20 to which a low voltage (EVSS) lower than the high voltage (EVDD) is supplied, and an emission layer provided between the first and second electrodes.

[0035] The structure of the pixel (P) applied in this specification is not limited to the structure shown in Fig. 2. Therefore, the structure of the pixel (P) can be changed into various forms.

[0036] The data driver 300 may supply data voltages to the data lines DL1 to DLd and a reference voltage Vref to the sensing lines SL. The data driver 300 may convert a data sensing signal received through the sensing lines SL into a digital signal and transmit the digital signal to the control driver 400.

[0037] Each of the data drivers 300 is mounted on a chip-on-film 600 .

[0038] The data driver 300 converts the signal received from the sensing capacitor 800 into a digital value and transmits the digital value to the control driver 400 .

[0039] The specific structure of the data driver 300 will be described with reference to FIGS.

[0040] Next, the control driver 400 can realign the input image data (Ri, Gi, Bi) transmitted from the external system 900 using the timing synchronization signal (TSS) transmitted from the external system 900, and can generate control signals (GCS, DCS) to be supplied to the data driver 300 and the gate driver 200.

[0041] To this end, as shown in FIG. 3, the control driver 400 may include a data alignment unit 430 for realigning input image data (Ri, Gi, Bi) to generate image data (Data) and supplying the image data (Data) to the data driver 300, a control signal generation unit 420 for generating a gate control signal (GCS) and a data control signal (DCS) using a timing synchronization signal (TSS), a control unit 410 for receiving the timing synchronization signal (TSS) and the input image data (Ri, Gi, Bi) from an external system 900 and transmitting them to the control signal generation unit 420 and the data alignment unit 430, and an output unit 440 for supplying the image data (Data) generated by the data alignment unit 430 and the data control signal (DCS) generated by the control signal generation unit 420 to the data driver 300 and outputting the gate control signal (GCS) generated by the control signal generation unit 420 to the gate driver 200.

[0042] The control signal generator 420 can also generate a power control signal (PCS) to be supplied to the power supply unit 500 .

[0043] The control driver 400 may further include a storage unit for storing various information. The storage unit may be included in the control driver 400, or may be provided separately from the control driver 400.

[0044] The control unit 410 of the control driver 400 may analyze the digital signal received from the data driver 300 to detect the chip-on-film 600 where an overcurrent has occurred, or may detect an area in the chip-on-film 600 where an overcurrent has occurred. When an overcurrent is detected, the control driver 400 may transmit an overcurrent detection signal to the external system 900. An overcurrent means a current that is recognized as being capable of damaging the chip-on-film 600. That is, when an overcurrent flows through the chip-on-film 600, a defect in which the chip-on-film 600 melts or burns may occur.

[0045] Upon receiving the overcurrent detection signal, the external system 900 can perform a preset protection function. For example, the external system 900 can control the control driver 400 to display a warning message regarding the overcurrent, or can drive an alarm device installed in the electronic device.

[0046] The external system 900 functions to drive the control driver 400 and the electronic device. For example, if the electronic device is a television (TV), the external system 900 can receive various audio information, video information, text information, etc. through a communication network and transmit the received video information to the control driver 400. In this case, the video information can be input video data (Ri, Gi, Bi).

[0047] Next, the power supply unit 500 generates various power supplies and supplies the generated power supplies to the control driver 400 , the gate driver 200 , the data driver 300 and the display panel 100 .

[0048] Next, the gate driver 200 can be directly built into the non-display area (NDA) using a gate in panel (GIP) method, or can be provided in the display area (DA) where the light-emitting element (ED) is provided, or can be provided in a film attached to the non-display area (NDA).

[0049] When the gate driver 200 is provided in the non-display area (NDA) using a gate-in-panel method, or when the gate driver 200 is provided in the display area (DA), the transistors constituting the gate driver 200 can be constructed through the same process as the transistors provided in the pixels (P) of the display area (DA).

[0050] The gate driver 200 supplies gate pulses to the gate lines (GL1 to GLg).

[0051] When the gate pulse (GP) generated by the gate driver 200 is supplied to the gate of the switching transistor (Tsw1) provided in the pixel (P), the switching transistor (Tsw1) is turned on. When the switching transistor (Tsw1) is turned on, the data voltage (Vdata) supplied through the data line (DL) is supplied to the pixel (P).

[0052] When a gate-off signal generated by the gate driver 200 is supplied to the switching transistor Tsw1, the switching transistor Tsw1 is turned off. When the switching transistor Tsw1 is turned off, the data voltage Vdata is no longer supplied to the pixel P.

[0053] The gate signal (GS) supplied to the gate line (GL) includes a gate pulse (GP) and a gate off signal.

[0054] The printed circuit board 700 can then have the power supply 500 and the control driver 400 mounted thereon.

[0055] Next, the low voltage line 20 extends from the printed circuit board 700 through the chip on film 600 to the light emitting display panel 100 and is connected to the light emitting element (ED). That is, the low voltage (EVSS) can be supplied to the light emitting element (ED) through the low voltage line 20.

[0056] Next, the printed circuit board 700 is provided with a main low voltage line 10 connected to the low voltage line 20 and to the power supply unit 500. That is, the power supply unit 500 can supply a low voltage (EVSS) to the light emitting element (ED) through the main low voltage line 10 and the low voltage line 20. For example, the main low voltage line (10) can be arranged in a direction perpendicular to the low voltage line (20) (e.g., vertical direction). The printed circuit board 700 is provided with a power supply unit 500. The control driver 400 can be provided on the printed circuit board 700, or can be provided on a separate circuit board. Meanwhile, when the light-emitting display panel 100 is connected to a first printed circuit board by a chip-on-film 600, and the first printed circuit board is connected to a second printed circuit board through a flexible flat cable (FFC) and a connecting member, the power supply unit 500 and the control driver 400 can be provided on the second printed circuit board, and the main low voltage line 10 can be provided on the first printed circuit board.

[0057] Next, the printed circuit board 700 and the light-emitting display panel 100 can be connected by the chip-on-film 600. In this case, the chip-on-film 600 can physically connect the printed circuit board 700 and the light-emitting display panel 100 and can also electrically connect them.

[0058] For example, as described above, the low voltage line 20 is extended to the light-emitting display panel 100 through the chip-on-film 600. In addition, the data control signal (DCS) and the gate control signal (GCS) transmitted from the control driver 400 are transmitted to the data driver 300 and the gate driver 200 through the chip-on-film 600. In addition, the data line (DL) connected to the data driver 300 is extended to the light-emitting display panel 100 through the chip-on-film 600.

[0059] Finally, the sensing capacitor 800 is connected to the main low voltage line 10 corresponding to the data driver 300 .

[0060] The fact that the sensing capacitors 800 correspond to the data drivers 300 means that each of the sensing capacitors 800 is connected to the main low voltage line 10 so as to be adjacent to one of the data drivers 300 .

[0061] 1, a sensing capacitor 800 is mounted on the printed circuit board 700 adjacent to the data driver 300 of the chip-on-film 600 provided on the left side of the printed circuit board 700, another sensing capacitor 800 is mounted adjacent to the data driver 300 of the chip-on-film 600 provided in the center of the printed circuit board 700, and another sensing capacitor 800 is mounted on the printed circuit board 700 adjacent to the data driver 300 of the chip-on-film 600 provided on the right side of the printed circuit board 700. For example, each sensing capacitor 800 can be connected to one of the data drivers 300, and each data driver 300 can be disposed on the chip-on-film 600, but is not limited thereto.

[0062] Each of the sensing capacitors 800 is coupled to the data driver 300 as shown in FIG.

[0063] FIG. 4 is an exemplary diagram showing one of the data drivers, a sensing capacitor, and a light-emitting display panel applied to the light-emitting display device according to the present specification, FIG. 5 is an exemplary diagram showing the configuration of a data driver applied to the light-emitting display device according to the present specification, and FIG. 6 is another exemplary diagram showing the configuration of a sensing unit applied to the light-emitting display device according to the present specification.

[0064] For example, while FIG. 1 shows one sensing capacitor 800 for one data driver 300, in FIG. 4, two sensing capacitors 811 and 812 are connected to one data driver 300. In FIG.

[0065] That is, in the light emitting display device according to the present specification, one sensing capacitor 800 can be connected to one data driver 300 as shown in FIG. 1, or two sensing capacitors 811 and 812 can be connected to one data driver 300 as shown in FIG. 4.

[0066] In the following description, when the light emitting display device shown in FIG. 1 is used as an example of this specification, the sensing capacitor 800 located on the leftmost side among the sensing capacitors 800 shown in FIG. 1 will be referred to as the first sensing capacitor 810, the data driver 300 to which the first sensing capacitor 810 is connected will be referred to as the first data driver 301, and the chip-on-film 600 to which the first data driver 301 is attached will be referred to as the first chip-on-film 610.

[0067] In the following description, when the light emitting display device shown in Fig. 4 is used as an example of the present specification, the sensing capacitor 800 provided on the left side of the sensing capacitors 800 shown in Fig. 4 is referred to as the 1-1 sensing capacitor 811, the sensing capacitor 800 provided on the right side is referred to as the 1-2 sensing capacitor 812, the data driver 300 to which the 1-1 sensing capacitor 811 and the 1-2 sensing capacitor 812 are connected is referred to as the first data driver 301, and the chip-on-film 600 to which the first data driver 301 is attached is referred to as the first chip-on-film 610. That is, only the first sensing capacitor 810 can be connected to the first data driver 301 shown in Fig. 1 and Fig. 4 as shown in Fig. 1, and the 1-1 sensing capacitor 811 and the 1-2 sensing capacitor 812 can be connected to the first data driver 301 as shown in Fig. 4. In the light emitting display device shown in FIG. 4, the data driver 300 is connected between the first-1 sensing capacitor 811 and the main low voltage line 10, and between the first-2 sensing capacitor 812 and the main low voltage line 10.

[0068] Each of the remaining data drivers 300 may be connected to only one sensing capacitor 800 as shown in Fig. 1, or to two sensing capacitors 800 as shown in Fig. 4. The contents described below may also be applied to the remaining data drivers 300 other than the first data driver 301.

[0069] 1 to 3, the printed circuit board 700 and the light-emitting display panel 100 are connected by the chip-on-film 600, each of the chip-on-films 600 is provided with a data driver 300, a low voltage line 20 extends from the printed circuit board 700 to the light-emitting display panel 100 through the chip-on-film 600, the low voltage line 20 is connected to the light-emitting element (ED), the printed circuit board 700 is provided with a main low voltage line 10 connected to the low voltage line 20, and a sensing capacitor 800 is connected to the main low voltage line 10 in a manner corresponding to the data driver 300. In this case, each of the sensing capacitors 800 is connected to the data driver 300.

[0070] 1, a low voltage line 20 is connected to a main low voltage line 10, and a first sensing capacitor 810 is connected to a position adjacent to a first data driver 301 in the main low voltage line 10, and the first sensing capacitor 810 is connected to the first data driver 301. Also, in order to improve electrical resistance and prevent voltage drop, the width of the main low voltage line 10 may be formed to be larger than the width of the low voltage line 20.

[0071] In this case, the first chip-on-film 610 on which the first data driver 301 is mounted is provided with a plurality of low voltage lines 20. Some of the low voltage lines 20 provided on the first chip-on-film 610 may be provided on a first side of the first data driver 301, for example, on the left side of the first data driver 301 in Fig. 1, and the remaining low voltage lines 20 may be provided on a second side of the first data driver 301, for example, on the right side of the first data driver 301 in Fig. 1. That is, the plurality of low voltage lines 20 may be distributed on the first and second sides of the first data driver 301 in the first chip-on-film 610.

[0072] Also, as shown in FIG. 4, a low voltage line 20 is connected to the main low voltage line 10, and a 1-1 sensing capacitor 811 and a 1-2 sensing capacitor 812 are connected to a position of the main low voltage line 10 adjacent to the first data driver 301, and the 1-1 sensing capacitor 811 and the 1-2 sensing capacitor 812 are connected to the first data driver 301.

[0073] In this case, the 1-1 sensing capacitor 811 may be provided at a position adjacent to the first side of the first data driver 301 in the main low voltage line 10, and the 1-2 sensing capacitor 812 may be provided at a position adjacent to the second side of the first data driver 301 in the main low voltage line 10.

[0074] Next, the first data driver 301 may include a data voltage generator 310 that supplies a data voltage (Vdata) to a data line (DL) provided in the light-emitting display panel 100, and a sensing unit 320 that converts a signal transmitted from a first sensing capacitor 810 connected to a position adjacent to the first data driver 301 in the main low voltage line 10 into a digital value (DV) and transmits the digital value (DV) to the control driver 400.

[0075] The data voltage generator 310 is applied to all general light emitting display devices for supplying a data voltage Vdata to a data line DL, and therefore, a detailed description thereof will be omitted.

[0076] In this case, the sensing unit 320 shown in FIG. 5 may sense the threshold voltage or mobility of the driving transistor (Tdr), or may sense the threshold voltage or other characteristics of the light emitting element (ED), and may additionally sense the current flowing through the low voltage line 20.

[0077] To this end, the sensing unit 320 may include, as shown in FIG. 5, a dummy switching unit 321 including a 1-1 switch 321a for transmitting a signal transmitted from the 1-1 sensing capacitor 811 to the 1-1 dummy sensing line (DSL1-1) and a 1-2 switch 321b for transmitting a signal transmitted from the 1-2 sensing capacitor 812 to the 1-2 dummy sensing line (DSL1-2), a sensing switching unit 322 including a sensing switch connected to a sensing line (SL) provided in the pixel (P), a holding unit 323 for holding the signal transmitted from the dummy switching unit 321 or the sensing switching unit 322, and a conversion unit 324 for converting the signal transmitted from the holding unit 323 into a digital value (DV) and transmitting the digital value (DV) to the control driver 400.

[0078] The 1-1 switch 321a is provided between the 1-1 sensing capacitor 811 and the 1-1 dummy sensing line (DSL1-1), and the 1-2 switch 321b is provided between the 1-2 sensing capacitor 812 and the 1-2 dummy sensing line (DSL1-2). The 1-1 switch 321a and the 1-2 switch 321b can be simultaneously turned on or off in response to a control signal transmitted from the control driver 400.

[0079] The sensing switching unit 322 may transmit the sensing signal received from the sensing line (SL) to the holding unit 323. The sensing switches provided in the sensing switching unit 322 may also be simultaneously turned on or off in response to a control signal transmitted from the control driver 400.

[0080] The holding unit 323 holds the signal transmitted from the dummy switching unit 321 or the sensing switching unit 322 and can transmit the signal to the conversion unit 324 at the same time.

[0081] The converter 324 may convert the signal transmitted through the dummy switching unit 321 and the holding unit 323 into a digital value (DV) during an overcurrent sensing period, and transmit the digital value (DV) to the control driver 400. During a pixel sensing period, the converter 324 may convert the signal transmitted through the sensing switching unit 322 and the holding unit 323 into a digital value (DV) and transmit the digital value (DV) to the control driver 400.

[0082] That is, the sensing unit 320 shown in FIG. 5 includes a configuration for sensing the current applied to the low voltage line 20, and also includes a configuration for sensing the characteristics of the driving transistor (Tdr) and the light emitting element (ED) during a pixel sensing period in a conventional light emitting display device.

[0083] Therefore, detailed description of the configuration and function for sensing the characteristics of the driving transistor (Tdr) and the light emitting element (ED) during the pixel sensing period will be omitted.

[0084] Next, during the overcurrent sensing period, the first data driver 301 can convert the signal transmitted from the 1-1 sensing capacitor 811 to a 1-1 digital value and transmit the 1-1 digital value to the control driver 400, and convert the signal transmitted from the 1-2 sensing capacitor 812 to a 1-2 digital value and transmit the 1-2 digital value to the control driver 400.

[0085] To this end, the first-1 switch 321a and the first-2 switch 321b can be turned on during the overcurrent sensing period.

[0086] In this case, the control unit 410 of the control driver 400 can determine the location where the overcurrent occurs in the first side or the second side of the first chip on film 610 based on the first data driver 301 using the digital value (DV) transmitted from the first data driver 301 mounted on the first chip on film 610 during the overcurrent sensing period. For example, the control unit 410 can accurately detect a defect on the left or right side of the first chip on film 610 with respect to the first data driver 301.

[0087] For example, as shown in FIG. 4 and FIG. 5, the 1-1 sensing capacitor 811 is connected to the main low voltage line 10 at a position adjacent to the first side of the first chip on film 610 in the main low voltage line 10, and the 1-2 sensing capacitor 812 is connected to the main low voltage line 10 at a position adjacent to the second side of the first chip on film 610 in the main low voltage line 10. When an overcurrent flows on the first side of the first chip on film 610, the magnitude of the 1-1 current flowing to the conversion unit 324 through the 1-1 switch 321a may be greater than the magnitude of the 1-2 current flowing to the conversion unit 324 through the 1-2 switch 321b. Therefore, the 1-1 digital value converted from the 1-1 current and the 1-2 digital value converted from the 1-2 current may be different. In this case, the 1-1 digital value may deviate from a preset range. The predetermined range means a digital value that can be determined not to be an overcurrent.

[0088] In addition, when an overcurrent flows on the second side of the first chip on film 610, the magnitude of the 1-2 current flowing to the conversion unit 324 through the 1-2 switch 321b may be greater than the magnitude of the 1-1 current flowing to the conversion unit 324 through the 1-1 switch 321a. Therefore, the 1-2 digital value converted from the 1-2 current may differ from the 1-1 digital value converted from the 1-1 current. In this case, the 1-2 digital value may fall outside a preset range. The preset range refers to a digital value that can be determined not to be an overcurrent.

[0089] In this case, the control driver 400 may receive a 1-1 digital value that matches the information on the 1-1 switch 321a, and may receive a 1-2 digital value that matches the information on the 1-2 switch 321b. Thus, the control driver 400 may compare the 1-1 digital value and the 1-2 digital value to determine whether the overcurrent flows through the 1-1 sensing capacitor 811 or the 1-2 sensing capacitor 812. Thus, the control driver 400 may determine the location where the overcurrent occurs in the first side or the second side of the first chip on film 610 based on the first data driver 301.

[0090] If no overcurrent flows, the 1-1 digital value and the 1-2 digital value may be included in a preset range and may have similar values, so that the control driver 400 can determine that no overcurrent flows through the low voltage line 20 provided on the first chip on film 610.

[0091] Next, the control driver 400 can determine the chip-on-film 600 where the overcurrent occurs in the chip-on-film 600 by using the digital value (DV) transmitted from the data driver 300 during the overcurrent sensing period. That is, according to the example described above with reference to Figures 4 and 5, the control driver 400 can determine not only the position of the chip-on-film 600 where the overcurrent occurs, but also the location on the first side or the second side of the chip-on-film 600 where the overcurrent occurs.

[0092] However, in Figures 4 and 5, when only one of the 1-1 sensing capacitor 811 and the 1-2 capacitor 812 is connected to the first data driver 301 and one sensing capacitor 800 is connected to each of the remaining data drivers 300, the control driver 400 can determine which of the chip-on-films 600 has an overcurrent.

[0093] That is, when the first sensing capacitor 810 shown in FIG. 1 is connected to the sensing unit 320 shown in FIG. 5, the first sensing capacitor 810 may be any one of the 1-1 sensing capacitor 811 and the 1-2 sensing capacitor 812. In the following, an example in which the 1-1 sensing capacitor 811 is the first sensing capacitor 810 will be described. In this case, the sensing unit 320 shown in FIG. 5 may not include the 1-2 switch 321b and may only include the 1-1 switch 321a. Also, each of the remaining data drivers 300 may include only the 1-1 switch 321a connected to the 1-1 sensing capacitor 811 in the sensing unit 320.

[0094] When only one sensing capacitor 800 is connected to each data driver 300 and an overcurrent flows to at least one of the first and second sides of the first chip on film 610, the magnitude of the 1-1 current flowing to the conversion unit 324 through the 1-1 switch 321a may be greater than the magnitude of the current flowing to the conversion unit 324 of the remaining data drivers 300. Therefore, the 1-1 digital value converted from the 1-1 current may differ from the digital value generated by the remaining data drivers 300. In this case, the 1-1 digital value may deviate from a preset range. The preset range means a digital value that can be determined not to be an overcurrent.

[0095] In this case, the control driver 400 may receive the 1-1 digital value that matches the information related to the first data driver 301, and may receive the remaining digital values ​​that match the information related to the remaining data drivers 300. Thus, the control driver 400 may compare the 1-1 digital value and the remaining digital values ​​to determine whether an overcurrent is flowing through the 1-1 sensing capacitor 811. Thus, the control driver 400 may determine that an overcurrent has occurred in the first chip on film 610 including the first data driver 301.

[0096] If no overcurrent flows, the 1-1 digital value and the remaining digital values ​​may be within a preset range and may have similar values, so that the control driver 400 can determine that no overcurrent flows through any of the chips on films 600.

[0097] 5 may convert the current transmitted from the first sensing capacitor 810 (or the 1-1st sensing capacitor 811) connected to a position adjacent to the first data driver 301 in the main low voltage line 10 into a digital value (DV) and transmit the digital value to the control driver 400. In this case, the control driver 400 may compare the digital value received from the first data driver 301 with the digital value received from the remaining data drivers 300 to recognize the first data driver 301 to which the overcurrent has been input, and may thus determine that an overcurrent is flowing in the first chip-on-film 610 to which the first data driver 301 is attached. That is, the control driver 400 may determine the chip-on-film 600 in which the overcurrent has occurred among the chip-on-films 600 by using the digital value (VD) transmitted from the data driver 300 during the overcurrent sensing period.

[0098] That is, the sensing unit 320 can determine which chip-on-film 600 has an overcurrent, and can also determine whether the overcurrent has occurred on the first side or the second side of the chip-on-film 600.

[0099] Finally, the sensing unit 320 may be formed in the structure shown in Fig. 5 or in the structure shown in Fig. 6. However, the sensing unit 320 shown in Fig. 6 may be included in the sensing unit 320 shown in Fig. 5, in which case the dummy switch unit 321 may be omitted in the sensing unit 320 shown in Fig. 5.

[0100] For example, the sensing unit 320 shown in FIG. 6 may branch the voltage applied to the sensing capacitor 800 and transmit the digital value (DV) generated thereby to the control driver 400.

[0101] To this end, the sensing unit 320 may include, as shown in FIG. 6, a resistor unit 340 connected to a sensing capacitor 800 and a comparator unit 350 that generates a digital value (DV) using a signal received from the resistor unit 340 and transmits the digital value (DV) to the control driver 400.

[0102] The resistor unit 340 may include at least two resistors (R1, R2) to branch the voltage applied to the sensing capacitor 800 into voltages of different magnitudes. For example, if the two resistors (R1, R2) have different resistance values ​​and an overcurrent flows through the sensing capacitor 800, a voltage or current outside a preset range may be generated between the two resistors (R1, R2). The preset range refers to a voltage range or current range within which it can be determined that there is no overcurrent.

[0103] In this case, the voltage or current generated between the two resistors (R1, R2) is transmitted to the comparison unit 350, and the comparison unit 350 can compare the voltage or current transmitted from the resistance unit 340 with a reference signal (Ref).

[0104] For example, if it is determined that the voltage or current generated between the two resistors R1 and R2 is within a preset range, the comparator 350 may output a digital value DV of 1. If it is determined that the voltage or current generated between the two resistors R1 and R2 is outside the preset range, the comparator 350 may output a digital value DV of 0.

[0105] In this case, a digital value (DV) of 0 or 1 can be transmitted to the control driver 400 by matching with the information of the resistor unit 340 .

[0106] Therefore, the control driver 400 can determine that an overcurrent is flowing through the sensing capacitor 800 connected to the resistor unit 340 to which the digital value (DV) of zero is transmitted.

[0107] 1, when only one sensing capacitor 800 is connected to each data driver 300, the control driver 400 can recognize the data driver 300 including the resistor unit 340 to which a digital value (DV) of 0 is transmitted. Therefore, the control driver 400 can determine that the chip-on-film 600 equipped with the data driver 300 to which a digital value (DV) of 0 is transmitted is the chip-on-film 600 in which an overcurrent has occurred.

[0108] 4, when two sensing capacitors 800 are connected to each of the data drivers 300, the control driver 400 can recognize the data driver 300 including the resistor unit 340 to which the digital value (DV) of zero is transmitted. In particular, the control driver 400 can recognize at which position on the first side or the second side of the data driver 300 the resistor unit 340 to which the digital value (DV) of zero is transmitted is provided. Therefore, the control driver 400 can determine that an overcurrent has occurred in the chip-on-film 600 to which the data driver 300 to which the digital value (DV) of zero is transmitted is attached, and can particularly determine at which position on the first side or the second side of the chip-on-film 600 the overcurrent has occurred.

[0109] FIG. 7 is a diagram illustrating a configuration of a power supply unit applied to the light emitting display device according to the present specification.

[0110] As shown in FIG. 7, the power supply unit 500 applied to the light emitting display device according to the present specification may include a power switching unit 530 connected between a main low voltage line 10 and a ground, a switching control unit 510 for turning on or off the power switching unit 530, and a sensing voltage generation unit 520 for generating a sensing voltage to be supplied to the low voltage line 20 during a pixel sensing period.

[0111] For example, during a display period in which the light emitting display device displays an image, the control driver 400 may transmit a power control signal (PCS) to the switching control unit 510 to turn on the power switching unit 530, and may transmit a power control signal (PCS) to the sensing voltage generation unit 520 to turn off the sensing voltage generation unit 520.

[0112] This allows the main low voltage line 10 to be connected to the ground, that is, during the display period, the second electrode of the light emitting element (ED) is connected to the ground, thereby allowing light to be output from the light emitting element (ED).

[0113] In addition, when the control driver 400 receives a power-off signal or a power-on signal, it can supply a floating control signal to the switching control unit 510, and when the switching control unit 510 receives the floating control signal, it can turn off the power switching unit 530.

[0114] As a result, the main low voltage line 10 floats, and while the main low voltage line 10 is floating, the signal transmitted from the sensing capacitor 800 can be converted to a digital value (DV) by the data driver 300 and transmitted to the control driver 400. That is, when a power-off signal or a power-on signal is received, an overcurrent sensing period is started, and during the overcurrent sensing period, the main low voltage line 10 and the low voltage line 20 float.

[0115] Also, when the overcurrent sensing period has passed, the pixel sensing period can be started. In this case, the control driver 400 can transmit a power control signal (PCS) to the switching control unit 510 to turn off the power switching unit 530, and can transmit a power control signal (PCS) to the sensing voltage generation unit 520 to cause the sensing voltage generation unit 520 to generate a sensing voltage.

[0116] Thereby, a sensing voltage can be supplied to the second electrode of the light-emitting element (ED), and the threshold voltage or mobility of the driving transistor (Tdr), or the threshold voltage or other characteristics of the light-emitting element (ED) can be sensed according to the sensing voltage.

[0117] Alternatively, during the pixel sensing period, the sensing voltage generation unit 520 can supply a voltage for thermal characteristic sensing required for the thermal characteristic sensing drive of the data driver 300 to the data driver 300. Thereby, the characteristics of each data driver 300 due to the temperature change of the chip-on-film 600 can be sensed using the voltage for thermal characteristic sensing received through the dummy sensing line (DSL).

[0118] FIG. 8 is a flowchart of an embodiment showing an operation method of the light-emitting display device according to the present specification, and FIG. 9 is an exemplary diagram of signals used in the operation method shown in FIG. 8. In the following description, the same or similar contents as those described with reference to FIGS. 1 to 7 will be omitted or briefly described. In particular, in the following description, an operation method performed when the light-emitting display device is powered off will be described as an example of the operation method of the light-emitting display device according to the present invention. However, the following description can be similarly applied when the light-emitting display device is powered on. That is, in FIG. 8, the processes (S104 to S112) after receiving the power-off signal can be similarly applied to the processes after receiving the power-on signal. After the above processes (S104 to S112) are performed, the light-emitting display device can be powered off or an image can be displayed (S114).

[0119] In the following description, the power-off signal (P_off) is a signal for interrupting an operation of displaying an image in the display period (DP), and when the power-off signal (P_off) is received, the light emitting display device can start the overcurrent sensing period (SP1). The power-on signal (P_on) is a signal for starting an operation of displaying an image.

[0120] When the light emitting display device is powered off, only power is supplied to the light emitting display device and the light emitting display device is not driven. That is, the light emitting display device is powered off after the overcurrent sensing period (SP1) and the pixel sensing period (SP2) have passed. When the light emitting display device is powered on, the light emitting display device starts an operation of sensing an overcurrent and an operation of sensing a pixel, and after the overcurrent sensing period and the pixel sensing period have passed, the light emitting display device can display an image. However, as described above, hereinafter, an operating method performed when the light emitting display device is powered off will be described as an example of an operating method of the light emitting display device according to the present invention.

[0121] First, when an image is displayed in a display period (DP) of the light emitting display device, the control driver 400 can receive a power-off signal (P_off) from the external system 900 (S102).

[0122] Next, upon receiving a power-off signal (P_off), the control driver 400 can control the gate driver 200, the data driver 300, and the power supply unit 500 so that a black image is displayed.

[0123] Next, while a black image is being displayed, the control driver 400 transmits a floating control signal to the switching control unit 510 and transmits a power control signal (PCS) to the sensing voltage generating unit 520 to turn off the sensing voltage generating unit 520, so that the power switching unit 530 is turned off and the main low voltage line 10 floats (S106). When the main low voltage line 10 floats, the low voltage line 20 also floats.

[0124] The overcurrent sensing period may start when a floating control signal is supplied to the switching controller 510, or may start when the main low voltage line 10 is floating.

[0125] In particular, when the 1-1 switch 321 a and the 1-2 switch 321 b are turned on by the control signal (SAM) transmitted from the control driver 400 , the overcurrent flowing through the low voltage line 20 can be transmitted to the sensing unit 320 .

[0126] Next, when the main low voltage line 10 is floating, the data driver 300 can convert the signal transmitted from the sensing capacitor 800 to a digital value (DV) and transmit the digital value (DV) to the control driver 400 (S108), as described above with reference to Figures 1 to 7.

[0127] In this case, the period during which the 1-1 switch 321a and the 1-2 switch 321b of the sensing unit 320 shown in FIG. 5 are turned on by the control signal (SAM), the period during which the main low voltage line 10 is floating, and the period during which the comparison unit 350 shown in FIG. 6 compares the voltage or current transmitted from the resistor unit 340 with the reference signal (Ref) can be set to be shorter than the period during which the sensing capacitor 800 is fully charged.

[0128] That is, an overcurrent flowing in any one of the low voltage lines 20 flows to the main low voltage line 10, and therefore, all of the sensing capacitors 800 connected to the main low voltage line 10 may be charged with a voltage due to the overcurrent.

[0129] In this case, if the period for sensing the overcurrent is similar or longer than the period for which the sensing capacitors 800 are charged by the overcurrent, the magnitudes of the signals received from all of the sensing capacitors 800 may be the same or similar.

[0130] However, if the period for sensing the overcurrent is shorter than the period for which the sensing capacitor 800 is charged by the overcurrent, for example, if the period for sensing the overcurrent is set to about half the period for which the sensing capacitor 800 is fully charged by the overcurrent, the magnitude of the voltage charged to the sensing capacitor 800 adjacent to the low voltage line 20 through which the overcurrent flows may be greater than the magnitude of the voltage charged to the sensing capacitor 800 away from the low voltage line 20 through which the overcurrent flows.

[0131] This makes it possible to sense the sensing capacitor 800 adjacent to the low voltage line 20 through which the overcurrent flows.

[0132] Therefore, the period during which the 1-1 switch 321a and the 1-2 switch 321b of the sensing unit 320 shown in FIG. 5 are turned on, the period during which the main low voltage line 10 is floating, and the period during which the comparison unit 350 shown in FIG. 6 compares the voltage or current transmitted from the resistor unit 340 with the reference signal (Ref) can be set in various ways taking into account the period during which the sensing capacitor 800 is fully charged.

[0133] Next, when the digital value DV is received through the overcurrent sensing process (S108), the control driver 400 can detect the location where the overcurrent occurs using the digital value DV (S110).

[0134] When the position where the overcurrent occurs is detected, the control driver 400 can transmit information on the position where the overcurrent occurs to the external system 900, and the external system 900 can perform various preset protection functions accordingly. For example, the external system 900 can control the control driver 400 to display a warning message regarding the overcurrent, or can drive an alarm device installed in the electronic device. In this case, the pixel sensing process (S112) can be performed or not performed. If the pixel sensing process (S112) is not performed, the light emitting display device can be powered off. In addition, if an overcurrent is detected, the control driver 400 or the external system 900 can automatically cut off the power of the data driver 300 and the chip on film 600 where the overcurrent occurs, or can cut off the entire light emitting display device, thereby preventing further damage.

[0135] Next, if the location where the overcurrent has occurred is not detected, or if it is determined that an overcurrent has occurred but the pixel sensing process (S112) is set to be performed, the control driver 400 may perform the pixel sensing process (S112).

[0136] In the pixel sensing process (S112), at least one of the threshold voltage of the driving transistor (Tdr), the mobility of the driving transistor (Tdr), the threshold voltage of the light-emitting element (ED), other characteristics of the driving transistor (Tdr) and the light-emitting element (ED), and the presence or absence of a burnt in the light-emitting display panel 100 can be sensed.

[0137] Also in the pixel sensing process (S112), while the switch of the sensing switching unit 322 is turned on in response to the control signal (SAM) transmitted from the control driver 400, the sensing signal received through the sensing line (SL) can be transmitted to the sensing unit 320 and converted into a digital value.

[0138] Finally, when the pixel sensing process (S112) is completed, the light emitting display device is powered off (S114).

[0139] As described above, the light emitting display device according to the present specification can detect a chip-on-film 600 in which an overcurrent flows, and can also detect a position in which the overcurrent flows among the first and second sides of the chip-on-film 600 in which the overcurrent flows. In this case, the light emitting display device or an electronic device including the light emitting display device can perform various protection functions related to the overcurrent.

[0140] Therefore, according to the light emitting display device according to the present specification, it is possible to prevent defects such as damage to the light emitting display panel, the light emitting display device, and the electronic device due to an overcurrent.

[0141] Those skilled in the art to which the present invention pertains will understand that the present invention can be embodied in other specific forms without changing its technical concept or essential features. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims below rather than the above detailed description, and all modifications or alterations 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. [Explanation of symbols]

[0142] 100: Display panel 200: Gate driver 300: Data driver 400: Control driver

Claims

1. a power supply unit for supplying power to a light-emitting display panel having light-emitting elements; a printed circuit board on which the power supply unit is mounted; a plurality of chip-on-films connected between the printed circuit board and the light-emitting display panel; a data driver mounted on each of the plurality of chip-on-films; a control driver for controlling the power supply unit and the data driver; a voltage line extending from the printed circuit board through the chip-on-film to the light-emitting display panel and connected to the light-emitting element; a main voltage line provided on the printed circuit board, connected to the voltage line and connected to the power supply; a sensing capacitor corresponding to the data driver and connected to the main voltage line; Each of the sensing capacitors is connected to the data driver; A first data driver mounted on a first chip on film among the data drivers includes a first sensing unit; The first sensing unit detects an overcurrent flowing through the sensing capacitor.

2. A first data driver mounted on the first chip on film among the data drivers includes a data voltage generator that supplies a data voltage to a data line provided on the light-emitting display panel, 2. The light emitting display device of claim 1, wherein the first sensing unit converts a signal transmitted from a first sensing capacitor connected to a position adjacent to the first data driver in the main voltage line into a digital value and transmits the digital value to the control driver.

3. The first sensing unit, during an overcurrent sensing period, Converting a current transmitted from a first sensing capacitor connected to a position adjacent to the first data driver in the main voltage line into a digital value, and transmitting the digital value to the control driver; or The light emitting display device of claim 1 , further comprising: a first sensing capacitor that is connected to the first sensing capacitor and a digital value generated by dividing the voltage applied to the first sensing capacitor is transmitted to the control driver.

4. The control driver, during an overcurrent sensing period, The light emitting display device of claim 1 , further comprising: a digital value transmitted from the first sensing unit of the data driver to determine whether an overcurrent occurs in the chip on film.

5. A first data driver provided on a first chip on film among the data drivers is connected to a first-1 sensing capacitor and a first-2 sensing capacitor; the first-1 sensing capacitor is provided at a position adjacent to a first side of the first data driver in the main voltage line; 2. The light emitting display device of claim 1, wherein the first and second sensing capacitors are provided at positions adjacent to a second side of the first data driver in the main voltage line.

6. The first data driver, during an overcurrent sensing period, 6. The light emitting display device of claim 5, wherein the signal transmitted from the 1-1 sensing capacitor is converted into a 1-1 digital value and transmitted to the control driver, and the signal transmitted from the 1-2 sensing capacitor is converted into a 1-2 digital value and transmitted to the control driver.

7. The control driver, during an overcurrent sensing period, 2. The light emitting display device of claim 1, further comprising: a first data driver attached to a first chip-on-film, and a first data driver that is connected to the first chip-on-film and a second ....

8. The power supply unit, a power supply switching unit connected between the main voltage line and ground; The light emitting display device of claim 1 , further comprising: a switching control unit that turns on or off the power switching unit.

9. When the control driver receives a power-off signal or a power-on signal, the control driver supplies a floating control signal to the switching control unit; The light emitting display of claim 8 , wherein the switching control unit turns off the power switching unit when the switching control unit receives the floating control signal.

10. The light emitting display device of claim 9, wherein the data driver converts the signal transmitted from the sensing capacitor into a digital value after the power switching unit is turned off, and transmits the digital value to the control driver.

11. a display panel configured to display an image; a mains voltage line connected to a power supply; a plurality of voltage lines connected to the main voltage line for supplying voltage to the display panel; a plurality of chips on film, each including a data driver; a plurality of sensing capacitors, each of the plurality of sensing capacitors being connected to the main voltage line and to one of the data drivers of the data driver; the data driver includes a sensing unit; The sensing unit detects an overcurrent flowing through a corresponding one of the plurality of sensing capacitors.

12. Further comprising a control driver; The control driver receiving one or more sensing values ​​based on one or more capacitances of the sensing capacitors; The light emitting display device of claim 11 , further comprising: determining which of the chip-on-films generates an overcurrent based on the at least one sensing value.

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