KR20200079085A - Light emitting display apparatus - Google Patents

Abstract

An objective of the present invention is to provide a light emitting display apparatus, wherein when sensing data collected through a sensing line is out of a preset range, the change amount of the threshold voltage of a pixel connected to the sensing line is calculated using another sensing line or is adjacent to the sensing line.

Description

Light emitting display device {LIGHT EMITTING DISPLAY APPARATUS}

The present invention relates to a light emitting display device, and more particularly, to a light emitting display device that can improve the sensing failure due to moisture permeation.

In general, in a light emitting display device using a light emitting element such as a light emitting diode, due to reasons such as process variation and deterioration, characteristic variation such as threshold voltage (Vth) or mobility of the driving transistor occurs for each pixel. Therefore, the amount of current driving each light emitting diode is different, and this causes luminance variations between pixels.

In order to solve the above problem, various types of compensation methods are used in the light emitting display device to sense the threshold voltage or mobility of the driving transistor and to compensate the input image data according to the sensed value.

In order to apply the compensation method, the light emitting display panels are generally provided with sensing lines.

The sensing lines extend to the non-display area, and are electrically connected to a chip-on film on which the data driver IC is mounted through sensing pads provided in the non-display area.

However, when moisture penetrates the sensing pad while the light emitting display device is being used, a signal cannot be normally transmitted from the sensing pad through which moisture has penetrated.

Therefore, sensing signals transmitted to the sensing line connected to the sensing pad through which moisture has penetrated cannot be normally transmitted to the data driver IC.

Accordingly, variations in threshold voltages or mobility of driving transistors provided in pixels connected to the sensing line cannot be sensed normally, and thus normal correction is performed for input image data corresponding to the pixels. Cannot be done.

The object of the present invention proposed to solve the above-described problem is, if the sensing data collected through the sensing line is out of a preset range, another sensing line adjacent to the sensing line is used to attach the sensing line to the sensing line. It is to provide a light emitting display device that calculates a change amount of a threshold voltage of a connected pixel.

The light emitting display device according to the present invention for achieving the above-described technical problem is provided with pixels, each of the pixels is provided with a light emitting element and a pixel driving circuit for driving the light emitting element, the pixels sensing When information about a defective sensing line determined to be defective among the light emitting display panel and the sensing lines to which the lines are connected is received, the defective sensing line is separated from the data driver IC, and the defective sensing line is connected to the defective sensing line. And a sensing line control unit connected to another adjacent sensing line. The sensing lines are connected to sensing pads provided in the non-display area of the light emitting display panel, and two adjacent to each other under the control of the sensing line control unit in the non-display area or the data driver IC. A sensing line switching unit for connecting at least one of the sensing lines to the data driver IC is provided.

According to the present invention, even if the sensing signal is not normally received through the sensing line because moisture penetrates into the sensing pad to which the sensing line is connected, by using another sensing line adjacent to the sensing line, the sensing line is connected to the sensing line. The amount of change in the threshold voltage of the connected pixel can be calculated.

Therefore, even if the sensing pad is defective due to moisture penetration, a threshold voltage may be sensed for external compensation, and accordingly, correction may be made according to a change in the threshold voltage.

1 is an exemplary view showing a configuration of a light emitting display device according to the present invention.
2 is an exemplary view showing a configuration of a pixel applied to a light emitting display device according to the present invention.
3 is an exemplary view showing an arrangement structure of unit pixels applied to a light emitting display device according to the present invention.
4 is an exemplary view showing connection structures of sensing lines applied to a light emitting display device according to the present invention.
5 is an exemplary view showing a configuration of a control unit applied to a light emitting display device according to the present invention.
6 is an exemplary view showing a configuration of a data driver IC applied to a light emitting display device according to the present invention.
7 is an exemplary view showing the configuration of a sensing line switching unit and a sensing line control unit applied to a light emitting display device according to the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and have ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the invention is only defined by the scope of the claims.

It should be noted that in this specification, when adding reference numerals to components of each drawing, the same components have the same number as possible, even if they are displayed on different drawings.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. When'include','have','consist of', etc. mentioned in this specification are used, other parts may be added unless'~man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

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

In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as'~top','~upper','~bottom','~side', etc.,'right' Alternatively, one or more other parts may be located between the two parts unless'direct' is used.

In the case of the description of the time relationship, for example,'after','following','~after','~before', etc., when the temporal sequential relationship is described,'right' or'direct' It may also include cases that are not continuous unless it is used.

It should be understood that the term'at least one' includes all possible combinations from one or more related items. For example, the meaning of'at least one of the first item, the second item, and the third item' means 2 of the first item, the second item, and the third item, as well as the first item, the second item, or the third item, respectively. Any combination of items that can be presented from more than one dog.

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

Each of the features of the various embodiments of the present invention may be partially or totally combined or combined with each other, and technically various interlocking and driving may be possible, and each of the embodiments may be independently performed with respect to each other, or may be implemented together in an associative relationship. It might be.

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

1 is an exemplary view showing a configuration of a light emitting display device according to the present invention, FIG. 2 is an exemplary view showing a configuration of a pixel applied to a light emitting display device according to the present invention, and FIG. 3 is a light emitting display device according to the present invention It is an exemplary view showing an arrangement structure of unit pixels applied to, and FIG. 4 is an exemplary view showing connection structures of sensing lines applied to a light emitting display device according to the present invention.

In the organic light emitting display device according to the present invention, as illustrated in FIGS. 1 to 4, pixels 110 are provided, and each of the pixels 110 includes a light emitting element ED and the light emitting element ED. A pixel driving circuit (PDC) for driving a driver is provided, and the pixels 110 are connected to the sensing lines SL, and the emission display panel 100 is connected to the defective lines. When information on the sensing line is received, the sensing line controller 500 separates the defective sensing line from the data driver IC 300 and connects the defective sensing line to another sensing line adjacent to the defective sensing line. , Thresholds of at least one data driver IC 300 mounted on the chip-on film and driving transistors Tdr provided in the pixel driving circuits PDC to control the amount of current supplied to the light emitting elements ED. A gate line GL1 provided in the control unit 400 and the light emitting display panel 100 that generate correction values according to changes in voltages using sensing data Sdata received through the data driver IC 300. to GLg).

Here, the sensing lines SL are connected to sensing pads SPD provided in the non-display area 130 of the light emitting display panel 100. Inside the non-display area 130 or the data driver IC 300, under the control of the sensing line controller 500, at least one of the two sensing lines SL adjacent to each other is the data driver. A sensing line switching unit 800 for connecting to the IC 300 is provided.

In the following, the configurations are described sequentially.

First, the light emitting display panel 100 is divided into a display area 120 through which an image is output and a non-display area 130 surrounding the display area 120.

As illustrated in FIG. 2, the light emitting display panel 100 includes pixels 110 including the light emitting device ED and the pixel driving circuit PDC. In addition, signal lines for defining driving regions of the pixel driving circuit PDC and defining pixel regions in which the pixels 110 are formed are formed in the light emitting display panel 100.

The light emitting element ED includes a first electrode, a light emitting layer provided on the first electrode, and a second electrode provided on the light emitting layer. The light emitting layer may include any one of a blue light emitting part, a green light emitting part, and a red light emitting part for emitting light having a color corresponding to a color set in the pixel 110. The emission layer may include any one of an organic emission layer, an inorganic emission layer, and a quantum dot emission layer, or may include a stacked or mixed structure of the organic emission layer (or the inorganic emission layer) and the quantum dot emission layer.

The signal lines may include a gate line GL, a sensing pulse line SPL, a data line DL, a sensing line SL, a first driving power line PLA, and a second driving power line PLB. have.

The gate lines GL are formed side by side to have a constant distance along the second direction of the light emitting display panel 100, for example, a horizontal direction.

The sensing pulse lines SPL may be formed at regular intervals to be parallel to the gate lines GL. A sensing pulse SP is supplied to the sensing pulse lines SPL.

The data lines DL have a constant interval along a first direction, for example, a vertical direction, of the light emitting display panel 100 to intersect with the gate lines GL and the sensing pulse lines SPL. Can be formed side by side. However, the arrangement structure of the data line DL and the gate line GL may be variously changed.

The sensing lines SL are connected to sensing pads SPD provided in the non-display area 130 of the light emitting display panel 100.

The sensing line SL may be formed at regular intervals to be parallel to the data lines DL. However, the present invention is not limited to this. For example, at least three of the pixels 110 form one unit pixel, and in this case, as shown in FIGS. 3 and 4 in the unit pixel UP, one of the sensing lines SL ) May be formed.

In more detail, the data lines are formed in the first direction (for example, the vertical direction of FIG. 1) of the light emitting display panel 100, and the sensing line SL is parallel to the data lines. These are formed, and each of the sensing lines SL may be connected to at least three pixels 110 constituting each of the unit pixels UP formed in one horizontal line. 3 and 4, one sensing line SL is connected to a unit pixel UP composed of a red pixel R, a white pixel W, a green pixel G, and a blue pixel B. Although the light emitting display panel 100 is illustrated, the present invention is not limited thereto. That is, one sensing line SL may be connected to a unit pixel UP composed of a red pixel R, a green pixel G, and a blue pixel B, and in addition, at least three colors representing various colors It may be connected to a unit pixel UP composed of pixels 110.

A reference voltage Vref or a voltage for sensing is supplied to the sensing line SL. The reference voltage Vref may be used even when the mobility or threshold voltage of the driving transistor Tdr is sensed. In a period in which images are output, the reference voltage Vref to the source of the driving transistor Tdr. ) May be supplied.

When the mobility or threshold voltage is sensed, a sensing signal that can be used to determine a change amount of the threshold voltage or a change amount of the mobility of the driving transistor is received as the sensing line SL. The sensing signal is transmitted to the data driver IC 300 through the sensing line SL, the sensing pad SPD, and a line provided in the chip-on film.

The first driving power line PLA may be formed at regular intervals to be parallel to the data line DL and the sensing line SL. The first driving power line PLA is connected to the power supply and supplies the first driving power EVDD supplied from the power supply to each pixel 110.

The second driving power lines PLBs supply the second driving power EVSS supplied from the power supply unit to each pixel 110.

The pixel driving circuit PDC includes a driving transistor Tdr that controls the amount of current flowing through the light emitting element ED, the data line DL, and the driving transistor Tdr and the gate line GL. A connected switching transistor Tsw1, a sensing transistor Tsw2 and a capacitor Cst for transmitting the reference voltage Vref to a source of the driving transistor Tdr are provided. In addition, transistors for external compensation may be further provided in the pixel driving circuit PDC provided in each of the pixels 110.

That is, the pixel driving circuit (PDC) may be changed into various structures to perform external compensation, and the method of driving the pixel driving circuit (PDC) may also be variously changed.

External compensation means calculating a change in the threshold voltage or mobility of the driving transistor Tdr formed in the pixel 110, and varying the size of the data voltages supplied to the pixel according to the change amount do. Therefore, the structure of the pixel 110 may be changed in various forms so that a change in threshold voltage or mobility of the driving transistor Tdr can be calculated.

In addition, for external compensation, a method of calculating the change amount of the threshold voltage or mobility of the driving transistor Tdr using the pixel 110 may also be variously changed according to the structure of the pixel 110. .

In this case, sensing for the external compensation may be performed for one gate line for each blank period, and an electronic device (for example, a television (TV), monitor, smart) including the light emitting display device Phone, tablet PC, etc.) may be performed when turned off or turned on.

In the blank period, for example, a change amount of mobility of the driving transistor Tdr may be sensed, and when the electronic device is turned off or on, a change amount of threshold voltages of the driving transistor Tdr may be sensed. Can.

As described above, while the sensing is performed, a sensing signal is transmitted to the data driver IC 300 through the sensing line SL and the sensing pad SPD.

When the electronic device is turned on again, the control unit 400 generates correction values for correcting changes in threshold voltages of the driving transistors Tdr, and corrects input image data input from an external system using the correction values. To generate image data. The image data are transmitted to the data driver IC 300.

While the characteristic of the driving transistor Tdr, that is, a threshold voltage or a change in mobility is sensed, the reference voltage Vref or another voltage for the sensing may be supplied to the sensing line SL. , A sensing signal is transmitted to the data driver IC 300 through the sensing line SL.

While the sensing is not performed, the reference voltage Vref is supplied to the sensing line SL, and the reference voltage Vref maintains a source of the driving transistor Tdr at a constant voltage. do.

That is, according to the present invention, when the electronic device is turned on or off, a change in threshold voltages of the driving transistors Tdr is sensed, and a light emitting display device that corrects input image data by using the changed amount of sensed threshold voltages And not directly related to external compensation methods.

Accordingly, a structure of a pixel for external compensation and a method of performing external compensation may be configured with various pixel structures and various external compensation methods currently proposed for external compensation.

That is, the specific structure of the pixel for performing external compensation and the specific method of external compensation are outside the scope of the present invention. Accordingly, an example of a pixel for external compensation has been briefly described with reference to FIG. 2, and the external compensation method is also briefly described below. Hereinafter, a light emitting display device having the pixels 110 shown in FIG. 2 is described as an example of the present invention.

In the non-display area 130 or the data driver IC, at least one of the two sensing lines SL adjacent to each other is controlled by the sensing line controller 500 under the control of the sensing line controller 500. ) Is connected to the sensing line switching unit 800.

The detailed structure and function of the sensing line switching unit 800 will be described in detail below with reference to FIG. 7.

Second, the gate driver 200 gates signals to gate lines GL1 to GLg provided in the light emitting display panel 100 using gate control signals GCS transmitted from the control unit 400. (GP).

Here, the gate-on signal GP means a signal that can turn on the switching transistor Tsw1 connected to the gate lines GL1 to GLg. The signal capable of turning off the switching transistor Tsw1 is called a gate-off signal. The gate-on signal GP and the gate-off signal are collectively referred to as a gate signal.

The gate driver 200 is formed independently of the organic light emitting display panel 100, and the organic light emitting display panel is formed through a tape carrier package (TCP), a chip on film (COF), or a flexible printed circuit board (FPCB). It can be connected to (100).

However, the gate driver 200, using a gate in panel (GIP) method, through the manufacturing process of the pixel driving circuits (PDCs), directly to the outer periphery of the organic light emitting display panel 100 It may be formed.

Third, when the sensing line control unit 500 receives information on the defective sensing line determined as defective among the sensing lines SL, the control unit 500 receives the defective sensing line from the data driver IC 300 ), and connects the defective sensing line to another sensing line adjacent to the defective sensing line.

The sensing line controller 500 may be provided inside the non-display area 130 or the data driver IC 300.

The function of the sensing line controller 500 will be described in detail below with reference to FIG. 7.

Fourth, the control unit 400 controls the driving of the gate control signal GCS and the data driver IC 300 to control the driving of the gate driver 200 based on a timing synchronization signal input from an external system. A data control signal (DCS) for generating and a sensing control signal (SCS) for controlling driving of the sensing line controller 500 are respectively generated.

In addition, the control unit 400 converts the input image data received from the external system into image data, and transmits the image data to the data driver IC 300.

In particular, the control unit 400 is provided in the pixel driving circuits (PDCs) to compensate for changes in threshold voltages of the driving transistors (Tdrs) that control the amount of current supplied to the light emitting elements (EDs). Values are generated using sensing data Sdata received through the data driver IC 300.

In addition, when there is sensing data Sdata out of a predetermined range among the sensing data, the control unit 400 transmits information on a defective sensing line corresponding to the sensing data to the sensing line control unit 500. .

The specific configuration and function of the control unit 400 will be described in detail with reference to FIG. 5.

Fifth, the data driver IC 300 converts the image data Data transmitted from the controller 400 to data voltages Vdata, and then sets the data voltages Vdata to the data lines DL1 to DLd).

The data driver IC 300 supplies signals necessary for the sensing to the sensing lines SL during a period of sensing changes in threshold voltages or mobility of the driving transistors Tdr, and sensing Sensing signals are received from the lines SL.

In this case, the data driver IC 300 converts the sensing signals to the sensing data Sdata, and then transmits the sensing data Sdata to the control unit 400.

The data driver IC 300 is connected to the data lines DL1 to DLd, and is connected to the sensing lines SL through the sensing pads SPD.

The specific configuration and function of the data driver IC 300 will be described in detail with reference to FIG. 6.

5 is an exemplary view showing a configuration of a control unit applied to a light emitting display device according to the present invention.

The control unit 400 transmits sensing image data to be supplied to pixels formed on a horizontal line on which external compensation is performed, to the data driver IC 300.

The sensing for the external compensation may be performed for one gate line for each blank period, and an electronic device (for example, a television (TV), monitor, smartphone, te) including the light emitting display device. Blit PC, etc.) may be performed when turned off or on.

In the blank period, for example, a change amount of mobility of the driving transistor Tdr may be sensed, and when the electronic device is turned off or on, a change amount of threshold voltages of the driving transistor Tdr may be sensed. Can.

The controller 400 calculates correction values based on sensing data Sdata provided from the sensing unit included in the data driver IC 300 during the sensing period, and stores the correction values ( 450).

In order to perform the above functions, the control unit 400, as shown in FIG. 5, uses a timing synchronization signal (TSS) transmitted from an external system, input image data (Ri) transmitted from the external system , Gi, Bi) using the correction values, a data alignment unit 430 that supplies rearranged image data to the data driver IC 300, and the gate control signal using the timing synchronization signal. (GCS), a control signal generator 420 for generating the data control signal (DCS) and the sensing control signal (SCS), and the sensing data transmitted from the sensing unit included in the data driver IC (300). A calculation unit 410 for calculating the correction values for correcting a characteristic change of a driving transistor formed in each of the pixels using (Sdata), a storage unit 450 for storing the correction values, and the Output unit 440 for outputting image data and various control signals (DCS, GCS, SCS) to the data driver IC 300, the gate driver 200 or the sensing line controller 500 It includes.

The calculation unit 410 may be formed in the control unit 400 or may be formed independently of the control unit 400. Hereinafter, the light emitting display device according to the present invention will be described, taking as an example the case where the calculation unit 410 is included in the control unit 400 as illustrated in FIG. 5.

The storage unit 450 may store a change amount of mobility collected through the sensing process, a change amount of threshold voltages, and the correction values. The storage unit 450 may be manufactured independently of elements constituting the control unit 400 and then mounted on the main substrate 700 or may be included in the control unit 400.

Particularly, when there is sensing data outside a predetermined range among the sensing data Sdata, the calculator 410 transmits information on a defective sensing line corresponding to the sensing data to the sensing line controller. The information may be transmitted through the sensing control signal (SCS).

The preset range may include a minimum value and a maximum value that the sensing data can have. For example, the preset range includes the light emitting display panel 100, the sensing pads SPDs, the sensing lines SLs, the data driver IC 300 and the pixel driving circuits PDC. When operating normally, it may include a minimum value and a maximum value that the variation amounts of threshold voltages of the driving transistors Tdr can have.

That is, when the amount of change in the threshold voltage of the driving transistor Tdr is outside the predetermined range, it means that at least one of the components is not normal.

In particular, the inventors of the present invention, when the amount of change in the threshold voltage of the driving transistor Tdr is outside the preset range, moisture penetrates into the sensing pad SPD, and a defect is generated in the sensing pad SPD. It was confirmed that the possibility was high.

Accordingly, if there is sensing data outside a preset range among the sensing data Sdata, the control unit 400 transmits information on a defective sensing line corresponding to the sensing data to the sensing line control unit 500. .

In this case, the sensing line control unit 500 may control the sensing line switching unit 800 to connect the defective sensing line to another sensing line adjacent to the defective sensing line.

The control unit 400 transmitting the information to the sensing line control unit 500 performs the data driver IC 300 and the gate driver 200 to perform the process of sensing the variation of the threshold voltages once again. Control.

When the sensing data Sdata is received again from the data driver IC 300 after the sensing process is performed again, the control unit 400 generates the correction values using the sensing data Sdata.

6 is an exemplary view showing a configuration of a data driver IC applied to a light emitting display device according to the present invention. In FIG. 1, although the light emitting display device having one data driver IC 300 is illustrated as an example of the present invention, two or more of the data driver ICs 300 may be provided in the light emitting display device according to the present invention. have. Hereinafter, for convenience of description, a light emitting display device provided with one data driver IC 300 is described as an example of the present invention.

The data driver IC 300 is mounted on the chip-on film 600, and the chip-on film 600 is electrically connected to the sensing pads SPD provided in the non-display area 130.

The chip-on film 600 is provided with lines connected to the sensing lines SL through the sensing pads SPD.

6, the data driver IC 300 includes a data power supply unit 310 and a sensing unit 320.

The data power supply unit 310 is connected to the data lines DL, and the sensing unit 320 is connected to the sensing lines SL. Data pads for connecting the data power supply unit 310 and the data lines DL are also provided in the non-display area.

The data power supply unit 310 may sense image data for sensing data transmitted from the control unit 400 for sensing in a sensing mode in which the variation of threshold voltages or mobility of the driving transistors Tdr is sensed. By converting to voltages, the data voltages may be supplied to data lines connected to the data driver IC 300.

The data power supply unit 310 converts the image data (Data) supplied in units of horizontal lines from the control unit 400 into data voltages for image output in a period other than the sensing mode, that is, in a display mode. Can be supplied to the data lines DL.

In the sensing mode, the sensing unit 320 supplies sensing voltages to the sensing lines SL connected to the sensing unit 320 and then receives sensing signals corresponding to the sensing voltages. .

The sensing unit 320 is a digital value of the sensing signals representing changes in mobility or threshold voltages of the driving transistors Tdr included in the pixels 110 formed in one horizontal line. Transform into

The sensing unit 320 provides the sensing data Sdata to the control unit 400. In this case, the control unit 400 calculates the correction values using the sensing data Sdata.

The sensing unit 320 may supply the reference voltage Vref required for driving the pixel driving circuit PDC to the pixels in the display mode through the sensing lines SL.

7 is an exemplary view showing a configuration of a sensing line switching unit and a sensing line control unit applied to the light emitting display device according to the present invention.

The sensing line switching unit 800 is provided in the non-display area 130, and particularly, is provided in an area where the sensing pads SPD are provided.

The sensing line control unit 500 for controlling the sensing line switching unit 800 may be mounted on the main substrate 700 on which the control unit 400 is mounted, but may be provided in the non-display area 130. It might be. Hereinafter, a light emitting display panel 100 including the sensing line controller 500 provided in the non-display area 130 will be described as an example of the present invention.

The sensing line switching unit 800 connects at least one of the two sensing lines adjacent to each other to the data driver IC 300 under the control of the sensing line controller 500.

To this end, the sensing line switching unit 800 includes switching units 810 connected to the sensing line control unit 500.

Each of the switching units 810 is connected to two adjacent sensing lines.

Each of the switching units 810 includes three transistors TR1, TR2, and TR3.

The three transistors TR1, TR2, and TR3 are turned on or off by the sensing line controller 500.

For example, each of the switching units 810 is connected to an nth sensing line SLn among the two sensing lines, and a first transistor turned on or off by the sensing line controller 500. (TR1), a second transistor TR2 connected to an n+1 sensing line SLn+1 among the two sensing lines and turned on or off by the sensing line controller 500 and the two A third transistor TR3 is connected to the sensing lines SLn and SLn+1 and turned on or off by the sensing line controller 500. 1 and 4, k is the number of the sensing lines SL, and n is a natural number greater than 1 and less than k.

In this case, one end of the first transistor TR1 is connected to the nth sensing pad SPDn among the sensing pads SPD, the other end is connected to the pixel driving circuits PDC, and the gate is the sensing It is connected to the line control unit 500.

One end of the second transistor TR2 is connected to the n+1 sensing pad SPDn+1 among the sensing pads, the other end is connected to the pixel driving circuits PDC, and a gate is the sensing line controller It is connected to 500.

One end of the third transistor TR3 is connected to the other end of the first transistor TR1, the other end is connected to the other end of the second transistor TR2, and a gate is connected to the sensing line controller 500. .

When the sensing line control unit 500 receives information on the defective sensing line determined as defective among the sensing lines SL from the control unit 400, the first transistor TR1 or the second transistor ( TR2) is turned off, and the third transistor TR3 is turned on.

The sensing line control unit 500 turns on the first transistor TR1 and the second transistor TR2 when information on a defective sensing line determined to be defective among the sensing lines SL is not received. , Turn off the third transistor TR3.

In the above description, the light emitting display device in which the sensing line switching unit 800 and the sensing line control unit 500 are provided in the non-display area 130 has been described as an example of the present invention. However, the present invention is not limited to this.

For example, in the light emitting display device according to another embodiment of the present invention, the sensing line switching unit 800 and the sensing line control unit 500 are disposed inside the data driver IC 300 to sense each line. (SL) can be controlled.

In this case, since the sensing line switching unit 800 and the sensing line control unit 500 are not disposed in the non-display area 130, the non-display area 130 can be made small, and accordingly, the narrow It is possible to implement a narrow bezel.

Hereinafter, a driving method of a light emitting display device according to the present invention will be described with reference to FIGS. 1 to 7. In the following description, contents identical or similar to those described with reference to FIGS. 1 to 7 are omitted or briefly described.

First, when the electronic device including the light emitting display device according to the present invention is driven, the control unit 400 may perform sensing for each blank period, for example, one gate line SL, The data driver IC 300 and the gate driver 200 are controlled.

The data driver IC 300 may transmit a sensing voltage for the sensing to the sensing lines SL under the control of the control unit 400 and receive sensing signals from the sensing lines SL. . As described above, the data driver IC 300, the control unit 400 and the gate driver 200 perform sensing to generate the sensing signals, various external compensation methods currently being used. It can be executed using Therefore, detailed description thereof is omitted.

The data driver IC 300 converts the sensing signals to the sensing data Sdata and transmits the sensing data Sdata to the control unit 400.

The control unit 400 generates the correction values using the sensing data Sdata, and corrects the input image data using the correction values. The control unit 400 transmits image data generated by the correction values to the data driver IC 300.

The data driver IC 300 converts the image data Data into data voltages Vdata, and supplies the data voltages Vdata to the data lines DL1 to DLd.

Next, the control unit 400 senses threshold voltages of the driving transistors Tdr provided in the pixels 110 when the device turn-off signal indicating that the electronic device is turned off is received from the external system. The data driver IC 300 is driven.

That is, when the user turns off the power switch of the television (TV) after watching the electronic device, for example, a television (TV), the external system controlling the electronic device turns the device off signal Is transmitted to the control unit 400.

In this case, the control unit 400 controls the data driver IC 300 and the gate driver 200 to sense threshold voltages of the driving transistors Tdr.

The method of sensing the threshold voltages may also be implemented using various external compensation methods currently being used. Therefore, detailed description thereof is omitted.

Next, the data driver IC 300 converts the sensing signals received through the sensing lines SL into sensing data Sdata by the sensing process, and converts the sensing data Sdata into the control unit 400. ). Here, the sensing signal is an analog signal such as voltage or current, and the sensing data Sdata can be a digital signal.

Next, when the sensing data out of a preset range as described above is present among the sensing data Sdata, the control unit 400 receives information on a defective sensing line corresponding to the sensing data Sdata. Transmitting to the sensing line control unit 500. Hereinafter, for example, the case where the nth sensing line SLn is a defective sensing line is described as an example of the present invention.

That is, when it is determined that the n-th sensing data received through the n-th sensing line SLn is out of the preset range, the control unit 400 may include an n-th sensing pad connected to the n-th sensing line SLn ( SPDn). In this case, the defect of the nth sensing pad SPDn may be caused by moisture penetration. When the nth sensing pad SPDn is defective, it means that a sensing signal cannot be normally transmitted through the nth sensing pad SPDn, and that is, the nth sensing line SLn is defective.

Accordingly, the control unit 400 transmits the information that the nth sensing line SLn is defective to the sensing line control unit 500.

Next, the sensing line control unit 500 controls the sensing line switching unit 810 when the information indicating that the nth sensing line SLn is defective is received from the control unit 400 to control the defective sensing line. Is separated from the data driver IC 300, and the defective sensing line is connected to another sensing line adjacent to the defective sensing line.

That is, since it is determined that the nth sensing line SLn is defective, the sensing line control unit 500 includes a switching unit 810 connected to the nth sensing line SLn among the sensing line switching units 800. ) Control.

For example, the sensing line controller 500 may include the first transistor TR1 connected to the nth sensing line SLn among the transistors TR1, TR2, and TR3 provided in the switching unit 810. ) Is turned off, the second transistor TR2 is turned on, and the third transistor TR3 is turned on.

In this case, the second transistor TR2 may not be particularly controlled since it remains turned on before the process. However, since the first transistor TR1 was turned on before the process, the sensing line controller 500 must transmit a control signal to the first transistor TR1 in order to turn off the first transistor TR1. do. In addition, since the third transistor TR3 was turned off before the process, the sensing line controller 500 must transmit a control signal to the third transistor TR3 to turn on the third transistor TR3. do.

That is, the sensing line controller 500 transmits a control signal to turn off the first transistor TR1 to the gate of the first transistor TR1, and turns on the third transistor TR3. The control signal is transmitted to the gate of the third transistor TR3.

Next, when a signal indicating that the process has been performed is received from the sensing line control unit 500 or when a predetermined period has elapsed after the control unit 500 transmits the information to the sensing line control unit 500, the The control unit 400 controls the data driver IC 300 and the gate driver 200 to sense the threshold voltages of the driving transistors Tdr again.

Accordingly, the data driver IC 300 performs the process of generating the sensing data again.

In this case, since the first transistor TR1 is turned off, the sensing signal transmitted from the pixel driving circuit PDC connected to the nth sensing line SLn includes the third transistor TR3, The second transistor TR2 and the second transistor TR2 are connected to the data driver IC 300 through an n+1 sensing pad SPDn+1.

In addition, the sensing signal transmitted from the pixel driving circuit PDC connected to the n+1 sensing line SLn+1 also includes the second transistor TR2 and the n+1 sensing pad SPDn+1. ) To the data driver IC 300.

That is, the sensing signal transmitted to the data driver IC 300 through the n+1 sensing pad SPDn+1 includes a threshold voltage of the driving transistor connected to the n-th sensing line SLn and the n+ All information about the threshold voltage of the driving transistor connected to one sensing line SLn+1 is included.

Next, the data driver IC 300 converts the sensing signals received through the n+1 sensing pad SPDn+1 and the sensing signals received through the remaining sensing pads into sensing data, and then senses the data. Data Sdata is transmitted to the control unit 400.

Next, the control unit 400 determines variations in threshold voltages of the driving transistors Tdr using the sensing data Sdata received from the data driver IC 300.

Next, the control unit 400 generates the correction values to correct input image data corresponding to the pixels using the variation amounts.

In this case, the sensing data received through the n+1 sensing pad SPDn+1 includes the threshold voltage of the driving transistor connected to the nth sensing line SLn and the n+1 sensing line SLn+1. All information about the threshold voltage of the driving transistor connected to) is included.

Accordingly, the control unit 400 uses the sensing data received through the n+1 sensing pad SPDn+1 to change the threshold voltage of the driving transistor connected to the nth sensing line SLn and the A change in threshold voltage of the driving transistor connected to the n+1 sensing line SLn+1 may be calculated.

In this case, the calculated amount of change in the threshold voltage is the actual amount of change in the threshold voltage of the driving transistor connected to the nth sensing line SLn and the actual threshold of the driving transistor connected to the n+1 sensing line SLn+1. It may be different from the voltage change. However, the calculated amount of change in the threshold voltage is the actual amount of change in the threshold voltage of the driving transistor connected to the nth sensing line SLn and the actual threshold of the driving transistor connected to the n+1 sensing line SLn+1. It may have a value similar to the amount of change in voltage.

A change in threshold voltage of the driving transistor connected to the nth sensing line SLn and the n+1 sensing line SLn using the sensing data received through the n+1 sensing pad SPDn+1 Equations and processing methods that allow the variation of the threshold voltage of the driving transistor connected to +1) to be calculated can be variously set through information collected through various simulations, actual measurements, and various tests.

For example, through various simulations, actual measurements, and various tests, a value corresponding to 1/2 of the sensing data received through the n+1 sensing pad SPDn+1 is the nth sensing line ( If it is determined that the amount of change in the threshold voltage of the driving transistor connected to SLn) and the threshold voltage of the driving transistor connected to the n+1 sensing line SLn+1 are determined, the control unit 400 may display 1 of the sensing data. A value corresponding to /2 may be set as a change amount of a threshold voltage of the driving transistor connected to the nth sensing line SLn and a change amount of a threshold voltage of the driving transistor connected to the n+1 sensing line SLn+1. .

That is, the amount of change in the threshold voltage of the driving transistor connected to the nth sensing line SLn and the n+1 sensing line using the sensing data received through the n+1 sensing pad SPDn+1 The method of calculating the change amount of the threshold voltage of the driving transistor connected to (SLn+1) may be set through various statistical data.

The control unit 400 corrects input image data corresponding to pixels connected to the nth sensing line SLn and the n+1 sensing line SLn by using the calculated change amount of the threshold voltage. Correction values to correct input image data corresponding to pixels connected to +1) may be generated.

Next, the control unit 400 may store the correction values in the storage unit 450 and then transmit a signal that the correction value generation process is completed to the external system.

Next, when the signal is received, the external system cuts off power supplied to the light emitting display device, and accordingly, the light emitting display device and the electronic device are turned off.

Finally, when the user turns on the power switch to use the electronic device again, the external system supplies power to the light emitting display device, and accordingly, the light emitting display device is driven.

In this case, the control unit 400 corrects the input image data transmitted from the external system using the correction values stored in the storage unit 450, and the image drivers generated by the correction Transmit to IC 300.

Therefore, even when the threshold voltages of the driving transistors Tdr are changed, the light emitting display panel 100 can output a normal image.

When the light emitting display device is driven, the sensing line control unit 500 continuously transmits a control signal capable of turning off the first transistor TR1 to the gate of the first transistor TR1. A control signal capable of turning on the 3 transistor TR3 may be transmitted to the gate of the third transistor TR3.

As described above, when the light emitting display device is driven, for each blank period, sensing for calculating a change amount of mobility of the driving transistors Tdr provided in pixels connected to any one gate line GL This can be done.

In the sensing process for calculating the change amount of the mobility, the mobility of the driving transistor connected to the nth sensing line SLn using the sensing data received through the n+1 sensing pad SPDn+1 A change amount of and a change amount of mobility of the driving transistor connected to the n+1 sensing line SLn+1 may be calculated.

In this case, the controller 400 uses the change amount of the mobility to input image data corresponding to pixels connected to the nth sensing line SLn and the n+1 sensing line SLn+1. Correction values to correct input image data corresponding to the connected pixels may be generated.

That is, while the light emitting display device is being driven, the control unit 400 may correct the input image data using correction values generated through the mobility sensing process.

Therefore, according to the present invention, even if the sensing pad SPD transmitted to the data driver IC 300 does not normally operate due to moisture infiltration, the amount of change and mobility of threshold voltages of the driving transistors provided in the pixels Correction according to the amount of change can be made normally.

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

100: light emitting display panel 200: gate driver
300: data driver IC 400: control unit
110: pixels

Claims (10)

A light emitting display panel in which pixels are provided, each of the pixels is provided with a light emitting element and a pixel driving circuit for driving the light emitting element, and sensing lines are connected to the pixels; And
When information on a defective sensing line determined to be defective among the sensing lines is received, the defective sensing line is separated from the data driver IC, and the defective sensing line is connected to another sensing line adjacent to the defective sensing line. Including the sensing line control unit,
The sensing lines are connected to sensing pads provided in the non-display area of the light emitting display panel,
In the non-display area or in the data driver IC, a sensing line switching unit for connecting at least one of two adjacent sensing lines to the data driver IC under the control of the sensing line controller is provided. Display device. According to claim 1,
The sensing line controller is a light emitting display device provided in the non-display area or the data driver IC. According to claim 1,
The sensing line switching unit includes switching units connected to the sensing line control unit,
Each of the switching units is a light emitting display device connected to two adjacent sensing lines. The method of claim 3,
Each of the switching units includes three transistors,
The three transistors are turned on or off by the sensing line controller. The method of claim 3,
Each of the switching parts,
A first transistor connected to an nth sensing line among the two sensing lines and turned on or off by the sensing line controller;
A second transistor connected to an n+1 sensing line among the two sensing lines and turned on or off by the sensing line controller; And
And a third transistor connected to the two sensing lines and turned on or off by the sensing line controller. The method of claim 5,
One end of the first transistor is connected to the nth sensing pad among the sensing pads, the other end is connected to the pixel driving circuits, and a gate is connected to the sensing line controller,
One end of the second transistor is connected to an n+1 sensing pad among the sensing pads, the other end is connected to the pixel driving circuits, and a gate is connected to the sensing line controller,
One end of the third transistor is connected to the other end of the first transistor, the other end is connected to the other end of the second transistor, and the gate is connected to the sensing line controller. The method of claim 6,
The sensing line control unit,
When information on the defective sensing line determined to be defective among the sensing lines is received, the first transistor or the second transistor is turned off and the third transistor is turned on. The method of claim 7,
The sensing line control unit,
A light emitting display device that turns on the first transistor and the second transistor and turns off the third transistor when information on a defective sensing line determined to be defective among the sensing lines is not received. According to claim 1,
The sensing line control unit receives information on a defective sensing line determined as defective among the sensing lines,
The control unit includes correction values according to changes in threshold voltages of driving transistors provided in the pixel driving circuits to control the amount of current supplied to light emitting elements, using sensing data received through the data driver IC. Create
The data driver IC mounted on a chip-on film is a light emitting display device that is connected to the sensing lines through the sensing pads. The method of claim 9,
When the device turn-off signal is received from the external system, the controller drives the data driver IC to sense threshold voltages of driving transistors provided in the pixels,
The data driver IC converts the sensing signals received through the sensing lines into sensing data and transmits them to the controller,
When the sensing data out of a preset range among the sensing data exists, the controller transmits information on a defective sensing line corresponding to the sensing data to the sensing line controller,
When the information is received, the sensing line control unit controls the sensing line switching unit to separate the defective sensing line from the data driver IC, and separates the defective sensing line from another sensing line adjacent to the defective sensing line. Connect it,
The data driver IC performs the process of generating the sensing data again,
The control unit determines changes in threshold voltages of the driving transistors using sensing data received from the data driver IC,
A light emitting display device that generates correction values to correct input image data corresponding to the pixels by using the amount of change.

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