KR20130029993A

KR20130029993A - Light emitting diode display device

Info

Publication number: KR20130029993A
Application number: KR1020110093460A
Authority: KR
Inventors: 김현욱; 문경수
Original assignee: 엘지디스플레이 주식회사
Priority date: 2011-09-16
Filing date: 2011-09-16
Publication date: 2013-03-26

Abstract

PURPOSE: A light emitting display device is provided to improve an aperture ratio of a pixel by correcting a data signal supplied to a plurality of pixels based on a threshold voltage. CONSTITUTION: A plurality of pixels(PXL) include a light emitting diode. At least one dummy pixel(PXL_D) includes a dummy light emitting diode. A display panel(DSP) includes the plurality of pixels and at least one dummy pixel. A data correcting unit detects a threshold voltage of the dummy light emitting diode. A data correcting unit corrects data signals supplied to the plurality of pixels.

Description

Light emitting display device {LIGHT EMITTING DIODE DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display device, and more particularly, to a light emitting display device which can increase an aperture ratio of a pixel by externally detecting and compensating a threshold voltage of a light emitting diode included in a pixel.

As the driving time increases, the light emitting diode gradually increases its threshold voltage due to deterioration. Therefore, it is necessary to correct the data signal in accordance with the increased threshold voltage. Conventionally, various compensation circuits are formed in each pixel to detect threshold voltages and correct data signals. However, since such a compensation circuit includes a large number of transistors, the pixel to which the compensation circuit is applied has a problem that the aperture ratio of the compensation circuit must be considerably reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a data correction unit outside the display panel on which pixels are formed, and detects a threshold voltage from a light emitting diode formed in a dummy pixel or a reference pixel by using the data correction unit. By correcting the data signals to be supplied to the plurality of pixels based on the detected threshold voltages, the aperture ratio of the pixels can be increased, the threshold voltage detection time can be reduced, and the number of scan drive ICs can be reduced. The purpose is to provide a device.

According to an aspect of the present invention, there is provided a light emitting display device including: a plurality of pixels including a light emitting diode; At least one dummy pixel including a dummy light emitting diode; A display panel on which the plurality of pixels and at least one dummy pixel are formed; And a data compensator for detecting a threshold voltage of the dummy light emitting diode provided in the at least one dummy pixel, and correcting data signals to be supplied to the plurality of pixels based on the detected threshold voltage. do.

The display panel is partitioned into first to i-th display areas (i is a natural number greater than 1); The plurality of pixels are arranged in the first to i-th display areas; The dummy pixel includes first to i-th dummy pixels; A jth dummy pixel is formed in the jth display area; The data compensator detects a threshold voltage of the dummy light emitting diode of the jth dummy pixel located in the jth display area (j is a natural number less than or equal to i), and based on the detected threshold voltage, the jth display area And correcting the data signals to be supplied to the pixels located at.

The data compensator comprises first to i-th unit compensators; The j-th unit correction unit may include: a detection switching device connected according to a control signal and connected between the j-th sensing line and one electrode of the dummy light emitting diode of the j-th dummy pixel; A lookup table in which a plurality of preset correction data are stored according to a threshold voltage of a dummy light emitting diode of the jth dummy pixel; And selecting correction data from the lookup table based on the threshold voltage of the dummy light emitting diode provided from the jth sensing line, and providing a data signal to be supplied to the pixels of the jth display area based on the selected correction data. It includes a correction unit for correcting them.

The data compensator comprises first to i-th unit compensators and a lookup table; A plurality of preset correction data are stored in the lookup table according to a threshold voltage of a light emitting diode provided in one dummy pixel; The j-th unit correction unit may include: a detection switching device connected according to a control signal and connected between the j-th sensing line and one electrode of the dummy light emitting diode of the j-th dummy pixel; And selecting correction data from the lookup table based on the threshold voltage of the dummy light emitting diode provided from the jth sensing line, and providing a data signal to be supplied to the pixels of the jth display area based on the selected correction data. It includes a correction unit for correcting them.

Detection switching elements included in each of the first to i-th unit compensators receive the control signal in common; The control signal may be supplied to the detection switching elements included in the first to i-th unit correction units before the data signals are supplied to the pixels.

One correction data may be characterized by including a plurality of gradation correction data set for each gradation of the data signal.

The j-th dummy pixel is provided with a data signal supplied to any one of pixels included in the j-th display area that is located close to the j-th dummy pixel.

The display panel is partitioned into first to i-th display areas (i is a natural number greater than 1); First to kth display areas are positioned along a circumference of an edge of the display panel; Located at the center of the display panel such that the remaining k + 1 to i th display areas are surrounded by the first to k th display areas; The plurality of pixels are arranged in the first to i-th display areas; The dummy pixel includes first to kth dummy pixels (k is a natural number smaller than i); J-th dummy pixel is formed in j-th display area (j is a natural number less than or equal to k); The data compensator detects a threshold voltage of the dummy light emitting diode of the jth dummy pixel located in the jth display area, and selects data signals to be supplied to the pixels located in the jth display area based on the detected threshold voltage. In addition, the data signals to be supplied to the pixels positioned in at least one of the k + 1 to i th display areas are corrected.

The data compensator comprises first to kth unit compensators; The j-th unit correction unit may include: a detection switching device connected according to a control signal and connected between the j-th sensing line and one electrode of the dummy light emitting diode of the j-th dummy pixel; A lookup table in which a plurality of preset correction data are stored according to a threshold voltage of a dummy light emitting diode of the jth dummy pixel; And selecting correction data from the lookup table based on the threshold voltage of the dummy light emitting diode provided from the jth sensing line, and providing a data signal to be supplied to the pixels of the jth display area based on the selected correction data. And a correction unit for correcting the data signals to be supplied to the pixels located in at least one of the k + 1 to i-th display areas.

At least one pixel of the plurality of pixels may include a data switching device configured to transmit a data signal from a data line according to a scan signal; A driving switching device for generating a driving current based on the data signal from the data switching device and supplying the driving current to the light emitting diode; And a storage capacitor connected between the gate electrode and the source electrode of the driving switching device.

A dummy data switching device for transmitting a data signal from the data line according to the scan signal; A dummy driving switching device for generating a driving current based on a data signal from the dummy data switching device and supplying the driving current to the dummy light emitting diode; And a dummy storage capacitor connected between the gate electrode and the source electrode of the dummy driving switching device.

In addition, another light emitting display device according to the present invention for achieving the above object is a plurality of pixels including a light emitting diode; A display panel on which the plurality of pixels are formed; And setting the at least one pixel as a reference pixel, detecting a threshold voltage of the light emitting diode included in the reference pixel, and supplying data to be supplied to a plurality of pixels including the reference pixel based on the detected threshold voltage. And data correction to correct the signals.

The display panel is partitioned into first to i-th display areas (i is a natural number greater than 1); A plurality of pixels including the reference pixel is disposed in the first to i-th display areas; The reference pixel includes first to i th reference pixels; A j th reference pixel is formed in the j th display area; The data compensator detects a threshold voltage of the light emitting diode of the jth reference pixel located in the jth display area (j is a natural number less than or equal to i), and based on the detected threshold voltage, And correcting the data signals to be supplied to the j th reference pixel positioned and the plurality of pixels positioned in the j th display area.

The data compensator comprises first to i-th unit compensators; The j th unit correction unit may include: a detection switching device connected according to a control signal and connected between the j th sensing line and one electrode of the light emitting diode of the j th reference pixel; A lookup table in which a plurality of preset correction data are stored according to a threshold voltage of a light emitting diode included in the j th reference pixel; And selecting correction data from the lookup table based on the threshold voltage of the light emitting diode provided from the jth sensing line, and based on the selected correction data, the jth reference pixel and the jth reference pixel positioned in the jth display area and a correction unit for correcting data signals to be supplied to the plurality of pixels positioned in the display area.

The data compensator comprises first to i-th unit compensators and a lookup table; A plurality of preset correction data are stored in the lookup table according to the threshold voltage of the light emitting diode included in any one reference pixel; The j th unit correction unit may include: a detection switching device connected according to a control signal and connected between the j th sensing line and one electrode of the light emitting diode of the j th reference pixel; And selecting correction data from the lookup table based on the threshold voltage of the light emitting diode provided from the jth sensing line, and based on the selected correction data, the jth reference pixel and the jth pixel of the jth display area. And a correction unit for correcting data signals to be supplied to the pixels in the display area.

The light emitting display device according to the present invention has the following effects.

First, in the present invention, the display panel is divided into a plurality of display areas, and the threshold voltage is detected using a dummy pixel (or a reference pixel) representing pixels of each display area, thereby detecting the threshold voltages of all pixels. Compared to the technology, the lookup table can be configured with a smaller number, and the time for detecting these threshold voltages can be shortened.

Second, according to the structure of the present invention it is possible to reduce the number of scan drive integrated circuit (IC) included in the scan driver for driving the scan lines. That is, in the present invention, since the threshold voltage is detected using only one control signal, it is advantageous to reduce the number of scan drive ICs outputting the control signal and the scan signals.

Third, according to the structure of the present invention, since the structure of the pixel can be configured using two transistors and one capacitor, the pixel structure can be compared with the conventional technique in which a compensation circuit including a large number of transistors is formed for each pixel. The aperture ratio can be significantly increased. Accordingly, the luminance of the light emitting diode can be set relatively low, so that power consumption can be reduced.

1 is a view showing a light emitting display device according to a first embodiment of the present invention;
FIG. 2 is a detailed configuration diagram of any one pixel and a dummy pixel illustrated in FIG. 1.
FIG. 3 is a diagram illustrating a first specific embodiment of the display panel illustrated in FIG. 1.
4 is a detailed configuration diagram of the data correction unit of FIG.
5 is another detailed configuration diagram of the data correction unit of FIG.
6 is a diagram illustrating a process of outputting correction data signals output from a data compensator;
FIG. 7 illustrates a second specific embodiment of the display panel illustrated in FIG. 1. FIG.
FIG. 8 is a view showing a part of the data correction unit applied to the structure shown in FIG.
FIG. 9 illustrates a third specific embodiment of the display panel illustrated in FIG. 1. FIG.
FIG. 10 illustrates a fourth specific embodiment of the display panel illustrated in FIG. 1. FIG.
11 illustrates a light emitting display device according to a second embodiment of the present invention.
FIG. 12 illustrates a specific embodiment of the display panel DSP shown in FIG. 11.

1 is a view showing a light emitting display device according to a first embodiment of the present invention.

The light emitting display device according to the first embodiment of the present invention includes a display panel DSP as shown in FIG. 1. A plurality of pixels PXL and dummy pixels PXL_D are formed in the display panel DSP. Each of the pixels PXL includes a light emitting diode, and each of the dummy pixels PXL_D includes a dummy light emitting diode.

The display panel DSP is partitioned into a plurality of display areas A. FIG. The plurality of pixels PXL is disposed in a plurality of display areas A. FIG. The plurality of dummy pixels PXL_D are also disposed in the plurality of display areas A. FIG.

The plurality of pixels PXL and the dummy pixels PXL_D are connected to the plurality of scan lines SCL and the plurality of data lines DL.

Herein, the configuration of one pixel PXL and dummy pixel PXL_D will be described in more detail.

FIG. 2 is a detailed configuration diagram of any one pixel PXL and dummy pixel PXL_D shown in FIG. 1.

As illustrated in FIG. 1, one pixel PXL includes a data switching device DS, a driving switching device DR, a light emitting diode OLED, and a storage capacitor Cst.

The data switching element DS switches the data signal from the data line DL according to the scan signal SS from the scan line SCL.

The driving switching device DR generates a driving current based on the data signal switched from the data switching device DS, and supplies the driving current to the light emitting diode OLED. The first driving voltage VDD is supplied to the drain electrode of the driving switching device DR, and the second driving voltage VSS is supplied to the cathode electrode of the light emitting diode OLED.

The storage capacitor Cst is connected between the gate electrode and the source electrode of the driving switching device DR. The storage capacitor Cst stores the data signal supplied to the gate electrode of the driving switching element DR for one frame period. At this time, the data signal supplied to the gate electrode of this driving switching element DR is an analog signal.

As shown in FIG. 1, one dummy pixel PXL_D includes a dummy data switching device DS_D, a dummy driving switching device DR_D, a dummy light emitting diode OLED_D, and a dummy storage capacitor Cst_D.

The dummy data switching device DS_D switches the data signal from the data line according to the scan signal from the scan line SCL.

The dummy driving switching device DR_D generates a driving current based on the data signal switched from the dummy data switching device DS_D and supplies it to the dummy light emitting diode OLED_D. The first driving voltage VDD is supplied to the drain electrode of the dummy driving switching device DR_D, and the second driving voltage VSS is supplied to the cathode electrode of the dummy light emitting diode OLED_D.

The dummy storage capacitor Cst_D is connected between the gate electrode and the source electrode of the dummy driving switching device DR_D. The dummy storage capacitor Cst_D stores the data signal supplied to the gate electrode of the dummy driving switching device DR_D for one frame period. At this time, the data signal supplied to the gate electrode of the dummy driving switching element DR_D is an analog signal.

Meanwhile, the data compensator DCB shown in FIG. 2 detects a threshold voltage of the dummy light emitting diode OLED_D provided in the dummy pixel PXL_D, and based on the detected threshold voltage, the plurality of pixels PXL. Correct the data signals to be supplied to. At this time, the detected threshold voltage is an analog signal, and the data signals to be corrected are digital signals.

The data compensator DCB described above is formed outside the display panel DSP.

The dummy pixel PXL_D receives a data signal supplied to one of the pixels PXL included in the display area to which the dummy pixel PXL_D belongs. For example, as illustrated in FIG. 2, pixels PXL and dummy pixels PXL_D adjacent to each other are connected to the same data line DL to receive the same data signal.

FIG. 3 is a diagram illustrating a first specific embodiment of the display panel DSP shown in FIG. 1.

As shown in FIG. 3, the display panel DSP is divided into sixteen display areas A1 to A16. This is merely an example, and the display panel DSP may be divided into smaller or more display areas. For convenience of explanation, it is assumed that the display panel DSP is divided into sixteen display areas A1 to A16 as shown in FIG. 3.

In each display area, a plurality of pixels PXL and one dummy pixel PXL_D are formed. That is, a plurality of pixels PXL and a j-th dummy pixel PXL_D are formed in the j th display area. For example, a plurality of pixels PXL and a first dummy pixel PXL_D are formed in the first display area A1.

The dummy pixel PXL_D in each display area is a reference indicator for detecting threshold voltages of the pixels PXL in the corresponding display area. For example, the threshold voltage Vth1 of the dummy light emitting diode OLED_D detected from the first dummy pixel PXL_D belonging to the first display area A1 corresponds to the plurality of pixels PXL of the first display area A1. Representative threshold voltages of each of the light emitting diodes (OLED). In other words, the present invention does not independently detect the threshold voltage of the light emitting diode OLED for each of the pixels PXL positioned in the first display area A1, but belongs to the first display area A1. Only the threshold voltage of the dummy light emitting diode OLED_D formed in the first dummy pixel PXL_D, which can represent all the pixels PXL, is detected. The detected one threshold voltage is assumed as the threshold voltage of the light emitting diodes OLEDs belonging to all the pixels PXL positioned in the first display area A1. In a similar manner, the threshold voltage Vth2 of the dummy light emitting diode OLED_D detected from the second dummy pixel PXL_D belonging to the second display area A2 is determined by the plurality of pixels PXL of the second display area A2. The threshold voltages of the light emitting diodes OLED of each of the plurality of light emitting diodes OLEDs are represented, and the threshold voltage Vth3 of the dummy light emitting diode OLED_D detected from the third dummy pixel PXL_D of the third display area A3 is Representing threshold voltages of the light emitting diodes OLED of each of the plurality of pixels PXL of the third display area A3, ... are detected from the sixteenth dummy pixel PXL_D belonging to the sixteenth display area A16. The threshold voltage Vth16 of the dummy light emitting diode OLED_D represents the threshold voltages of the light emitting diodes OLED of each of the plurality of pixels PXL of the sixteenth display area A16.

The data compensator DCB detects a threshold voltage of the dummy light emitting diode OLED_D of the jth dummy pixel PXL_D located in the jth display area (j is a natural number less than or equal to 16), and detects the detected threshold voltage. On the basis of this, data signals to be supplied to the pixels PXL positioned in the j th display area are corrected. For example, the data compensator DCB detects the threshold voltage Vth1 of the dummy light emitting diode OLED_D in the first dummy pixel PXL_D positioned in the first display area A1, and detects the detected threshold voltage V1. The data signals to be supplied to each of the plurality of pixels PXL located in the first display area A1 are corrected based on Vth1, and the dummy in the second dummy pixel PXL_D located in the second display area A2 is corrected. The threshold voltage Vth2 of the light emitting diode OLED_D is detected, and data signals to be supplied to each of the plurality of pixels PXL positioned in the second display area A2 are corrected based on the detected threshold voltage Vth2. The threshold voltage Vth16 of the dummy light emitting diode OLED_D in the sixteenth dummy pixel PXL_D positioned in the sixteenth display area A16 is detected and based on the detected threshold voltage Vth16. Data signals to be supplied to each of the plurality of pixels PXL positioned in the sixteenth display area A16 are corrected.

To this end, this data correction unit (DCB) may have the following configuration.

FIG. 4 is a detailed configuration diagram of the data compensator DCB of FIG. 3.

As shown in FIG. 4, the data correction unit DCB includes a plurality of unit correction units UCR1 to UCR16. As shown in the above example, when the number of display areas is sixteen, this unit correction is also composed of sixteen.

One unit correction unit includes a detection switching element DT, a correction unit CR, and a lookup table LUT.

The detection switching device DT is controlled according to the control signal CS, and is connected between the j th sensing line and one electrode of the dummy light emitting diode OLED_D of the j th dummy pixel PXL_D. For example, the detection switching element DT included in the first unit correction unit UCR1 corresponding to the first dummy pixel PXL_D may include a light emitting diode of the first sensing line SSL1 and the first dummy pixel PXL_D. It is connected between the one electrode of (OLED).

The lookup table LUT stores a plurality of preset correction data according to the threshold voltage of the dummy light emitting diode OLED_D included in the j-th dummy pixel PXL_D. For example, the lookup table LUT included in the first unit correction unit UCR1 corresponding to the first dummy pixel PXL_D has a threshold voltage of the dummy light emitting diode OLED_D provided in the first dummy pixel PXL_D. And a plurality of preset correction data according to.

These correction data are digital signals, and the value of each of these correction data is set based on the deterioration degree of this dummy light emitting diode OLED_D. That is, as the driving time of the light emitting diode increases, the light emitting diode deteriorates and its threshold voltage gradually increases. The correction data are set based on the magnitude of the threshold voltage to compensate for the increase in the threshold voltage. . Therefore, as the threshold voltage increases, the size of the compensation data corresponding thereto also increases.

One correction data includes a plurality of grayscale correction data set for each grayscale of the data signal. That is, the compensation data corresponding to one threshold voltage or a range of threshold voltages is composed of a plurality of correction grayscale data set differently for each gray level of the data signal. For example, when the data signal is 8 bits, the data signal may have any one of 0 to 255 gradations. In this case, one correction data may have a total of 256 corresponding to 0 to 255 gradations. It may include calibration tone data. These correction tone data are digital signals.

The correction unit CR receives the threshold voltage of the dummy light emitting diode OLED_D from the jth sensing line. The threshold voltage is then converted into a digital signal. The correction data corresponding to the threshold voltage converted into the digital signal is selected from the lookup table (LUT), and the data signals to be supplied to the pixels PXL of the j th display area are corrected based on the selected correction data. . Specifically, the correction unit CR corrects data signals to be supplied to the pixels PXL of the j th display area by using correction grayscale data included in the selected correction data. For example, the correction unit CR included in the first unit correction unit UCR1 corresponding to the first dummy pixel PXL_D1 may have a threshold voltage of the dummy light emitting diode OLED_D provided from the first sensing line SSL1. Correction data is selected from the lookup table LUT based on the correction, and the data signals to be supplied to the pixels PXL of the first display area A1 are corrected based on the correction gradation data included in the selected correction data. do. In this case, each of the unit correction units UCR1 to UCR16 may generate the corrected data signal by adding the corresponding correction tone data to the currently input data signal. For example, when the data signal is 8 bits and the correction tone data is 2 bits, the correction data signal generated by each unit correction unit URC becomes 10 bits.

Meanwhile, each of the detection switching elements DT included in each of the unit correction units UCR1 to UCR16 receives the same control signal CS in common. The control signal CS is provided to the detection switching elements DT included in the first to sixteenth unit correction units UCR1 to UCR16 before the data signals are supplied to all the pixels PXL of all the display regions. Supplied. That is, in the present invention, the threshold voltage is detected before the data signals are applied to the pixel PXL, the data signals are first corrected, and then the corrected data signals are supplied to the pixel PXL. The control signal CS is output between every frame period. Specifically, the control signal CS is output between the end time of the n-1th frame (n is a natural number) and the start time of the nth frame.

FIG. 5 is another detailed configuration diagram of the data compensator DCB of FIG. 3.

As shown in FIG. 5, the data compensator DCB includes a plurality of unit compensators UCR1 to UCR16 and a lookup table LUT. As shown in the above example, when the number of display areas is sixteen, this unit correction is also composed of sixteen. In the lookup table LUT, as described above, a plurality of preset correction data are stored according to the threshold voltage of the dummy light emitting diode OLED_D included in any one of the dummy pixels PXL_D.

One unit correction unit URC includes a detection switching element DT and a correction unit CR.

The correction unit CR receives the threshold voltage of the dummy light emitting diode OLED_D from the jth sensing line. The threshold voltage is then converted into a digital signal. The correction data corresponding to the threshold voltage converted into the digital signal is selected from the lookup table LUT, and the data signals to be supplied to the pixels PXL in the j th display area are corrected based on the selected correction data. Specifically, the correction unit CR corrects data signals to be supplied to the pixels PXL of the j th display area by using correction grayscale data included in the selected correction data.

According to FIG. 5, the size of information stored in the lookup table LUT may be reduced by sharing one lookup table LUT with all unit correction units URC.

6 is a diagram illustrating a process of outputting correction data signals output from the data compensator DCB.

As shown in FIG. 6, the data compensator DCB detects threshold voltages of the dummy light emitting diodes OLED_D from the dummy pixels PXL_D formed in the display panel DSP and corrects the threshold voltages based on the threshold voltages. Select the data. The data correction unit DCB then corrects data signals (digital image data signals) of one frame input from the system using the correction data. The corrected data signals of one frame are transmitted to the timing controller TC. Then, the timing controller TC rearranges the corrected data signals of this one frame and supplies the corrected data signals of this one frame to the data driver DD according to a preset timing. Then, the data driver DD converts the corrected data signals of this one frame into analog signals for each horizontal line and supplies them to the data lines DL of the display panel DSP.

Since this process is repeated every frame period, corrected data signals are generated in consideration of the threshold voltage of the dummy light emitting diode OLED_D every frame period.

Each display area may include a plurality of dummy pixels PXL_D instead of one dummy pixel PXL_D. If this is explained in more detail as follows.

FIG. 7 is a diagram illustrating a second specific embodiment of the display panel DSP shown in FIG. 1.

As shown in FIG. 7, it can be seen that three dummy pixels PXL_D are formed in one display area. In this case, the unit compensator corresponding to one display area calculates an average threshold voltage by averaging three threshold voltages provided from the three dummy pixels PXL_D. The calculated average threshold voltage is converted into a digital signal, and correction data corresponding to the average threshold voltage converted into the digital signal is selected from the lookup table. The remaining operation is the same as that of the unit correction provided in the first embodiment shown in FIG.

If this is explained in more detail as follows.

FIG. 8 is a diagram illustrating a partial configuration of a data correction unit (DCB) applied to the structure shown in FIG. 7.

That is, the data compensator DCB has a plurality of unit compensators. In FIG. 8, only the first unit compensator UCR1 corresponding to the first display area A1 is shown. The remaining unit correction units also have the same configuration as the first unit correction unit UCR1 shown in FIG.

The first unit correction unit UCR1 includes a correction unit CR, a lookup table LUT, and three detection switching elements DT. The three detection switching elements DT detect three threshold voltages Vth101 to Vth103 from three dummy pixels PXL_D included in the first display area A1 according to the control signal CS. The detected three threshold voltages Vth101 to Vth103 are supplied to the correction unit CR. Then, the correction unit CR averages the three threshold voltages Vth101 to Vth103 and calculates an average threshold voltage. The calculated average threshold voltage is converted into a digital signal, and correction data corresponding to the average threshold voltage converted into the digital signal is selected from the look-up table LUT. The lookup table LUT may store correction data corresponding to any one of the three dummy light emitting diodes OLED_D of the three dummy pixels PXL_D.

Meanwhile, in the structures illustrated in FIGS. 3 and 7, the dummy pixels PXL_D are preferably covered by the black matrix layer so as not to be exposed to the display screen.

FIG. 9 is a diagram illustrating a third exemplary embodiment of the display panel DSP shown in FIG. 1.

As shown in FIG. 9, the display panel DSP is divided into 16 display areas. This is merely an example, and the display panel DSP may be divided into smaller or more display areas. For convenience of explanation, it is assumed that the display panel DSP is divided into sixteen display areas A1 to A16 as shown in FIG. 9.

In this case, the first to twelfth display areas A1 to A12 of the sixteen display areas A1 to A16 are positioned along the circumference of the edge of the display panel DSP, and the remaining thirteenth to sixteenth display areas. The A13 to A16 are positioned at the center of the display panel DSP so as to be surrounded by the first to twelfth display areas A1 to A12.

A plurality of pixels PXL and one dummy pixel PXL_D are formed in each of the first to twelfth display areas A1 to A12 positioned around the edge of the display panel DSP. That is, a plurality of pixels PXL and a j-th dummy pixel PXL_D are formed in the j th display area (j is a natural number smaller than or equal to 12). For example, a plurality of pixels PXL and a first dummy pixel PXL_D are formed in the first display area A1.

The dummy pixels PXL_D in the first to twelfth display areas A1 to A12 serve as reference indicators for detecting the threshold voltages of the pixels PXL in the corresponding display area. For example, the threshold voltage Vth1 of the dummy light emitting diode OLED_D detected from the first dummy pixel PXL_D belonging to the first display area A1 corresponds to the plurality of pixels PXL of the first display area A1. Representative threshold voltages of each of the light emitting diodes (OLED). In other words, the present invention does not independently detect the threshold voltage of the light emitting diode OLED for each of the pixels PXL positioned in the first display area A1, but belongs to the first display area A1. Only the threshold voltage of the dummy light emitting diode OLED_D formed in the first dummy pixel PXL_D, which can represent all the pixels PXL, is detected. The detected one threshold voltage is assumed as the threshold voltage of the light emitting diodes OLEDs belonging to all the pixels PXL positioned in the first display area A1. In a similar manner, the threshold voltage Vth2 of the dummy light emitting diode OLED_D detected from the second dummy pixel PXL_D belonging to the second display area A2 is determined by the plurality of pixels PXL of the second display area A2. The threshold voltages of the light emitting diodes OLED of each of the plurality of light emitting diodes OLEDs are represented, and the threshold voltage Vth3 of the dummy light emitting diode OLED_D detected from the third dummy pixel PXL_D of the third display area A3 is Representing threshold voltages of the light emitting diodes OLED of each of the plurality of pixels PXL of the third display area A3, ... are detected from the twelfth dummy pixel PXL_D in the twelfth display area A12. The threshold voltage Vth12 of the dummy LED OLED_D represents the threshold voltages of the light emitting diodes OLED of each of the plurality of pixels PXL of the twelfth display area A12.

In addition, the dummy pixels PXL_D in the first to twelfth display areas A1 to A12 are pixels of the central display area (the display area in which the dummy pixel PXL_D does not exist) adjacent to the corresponding display area. It can also be used as a reference indicator for detecting threshold voltages of the PXLs. For example, the threshold voltages of the pixels PXL of the thirteenth display area A13 are dummy located in the twelfth display area A12 or the second display area A2 adjacent to the thirteenth display area A13. It may be set based on the pixel PXL_D. As a more specific example, the dummy pixel PXL_D in the second display area A2 is not only the second display area A2 but also a pixel in the thirteenth display area A13 adjacent to and not having the dummy pixel PXL_D. It can be used as a reference indicator for detecting threshold voltages of the PXLs. In this case, the threshold voltages detected from the dummy light emitting diode OLED_D included in the second dummy pixel PXL_D include the pixels PXL of the second display area A2 and the pixels PXL of the thirteenth display area A13. Are used to calibrate the data signal to be supplied.

In this manner, the dummy pixel PXL_D in the third display area A3 is not only the third display area A3 but also adjacent to the pixel 14 in the fourteenth display area A14 having no dummy pixel PXL_D. It may be used as a reference indicator for detecting threshold voltages of the PXLs, and the dummy pixel PXL_D in the ninth display area A9 is adjacent to and adjacent to the ninth display area A9 and has no dummy pixel PXL_D. The dummy pixel PXL_D in the eighth display area A8 may be used as a reference indicator for detecting the threshold voltages of the pixels PXL in the sixteenth display area A16. In addition, it may be used as a reference indicator for detecting threshold voltages of the pixels PXL of the fifteenth display area A15 that are adjacent thereto and do not have the dummy pixel PXL_D.

The data compensator DCB detects a threshold voltage of the dummy light emitting diode OLED_D of the jth dummy pixel PXL_D located in the jth display area, and based on the detected threshold voltage, the pixel located in the jth display area Correct the data signals to be supplied to the PXLs. For example, the data compensator DCB detects the threshold voltage Vth1 of the dummy light emitting diode OLED_D in the first dummy pixel PXL_D positioned in the first display area A1, and detects the detected threshold voltage V1. The data signals to be supplied to each of the plurality of pixels PXL located in the first display area A1 are corrected based on Vth1, and the dummy in the second dummy pixel PXL_D located in the second display area A2 is corrected. The threshold voltage Vth2 of the light emitting diode OLED_D is detected, and data signals to be supplied to each of the plurality of pixels PXL positioned in the second display area A2 are corrected based on the detected threshold voltage Vth2. The threshold voltage Vth12 of the dummy light emitting diode OLED_D in the twelfth dummy pixel PXL_D positioned in the twelfth display area A12 is detected and based on the detected threshold voltage Vth12. Data signals to be supplied to each of the plurality of pixels PXL positioned in the twelfth display area A12 are corrected.

In addition, the correction unit CR may include pixels PXL positioned in at least one of the center display areas (that is, the thirteenth to fifteenth display areas A13 to A15) that do not include the dummy pixel PXL_D. Correct the data signals to be supplied to. For example, the data compensator DCB detects a threshold voltage of the dummy light emitting diode OLED_D in the second dummy pixel PXL_D located in the second display area A2 and based on the detected threshold voltage, The data signals to be supplied to each of the plurality of pixels PXL located in the thirteenth display area A13 are corrected along with the data signals to be supplied to each of the plurality of pixels PXL located in the second display area A2.

The data compensator DCB may have a configuration as shown in FIG. 4 described above.

That is, the data compensator DCB may include first to twelfth unit compensators corresponding to the first to twelfth display areas A1 to A12.

In this case, one unit compensator includes a detection switching device DT, a lookup table LUT, and a compensator CR.

The detection switching device DT is controlled according to the control signal CS, and is connected between the j th sensing line and one electrode of the dummy light emitting diode OLED_D of the j th dummy pixel PXL_D.

The lookup table LUT stores a plurality of preset correction data according to the threshold voltage of the dummy light emitting diode OLED_D included in the j-th dummy pixel PXL_D.

The correction unit CR selects correction data from the look-up table LUT based on the threshold voltage of the dummy light emitting diode OLED_D provided from the jth sensing line, and selects correction data from the j-th display area based on the selected correction data. The data signal to be supplied to the pixels PXL located in at least one of the central display areas (display areas in which the dummy pixel PXL_D is not formed) is corrected while the data signals to be supplied to the pixels PXL are corrected. Correct them.

In addition, the data compensator DCB may have a configuration as shown in FIG. 5 described above.

That is, the data compensator DCB may include first to twelfth unit compensators corresponding to the first to twelfth display areas A1 to A12 and one lookup table LUT. In the lookup table LUT, as described above, a plurality of preset correction data are stored according to the threshold voltage of the dummy light emitting diode OLED_D included in any one of the dummy pixels PXL_D.

In this case, one unit compensator includes a detection switching element DT and a correction unit CR.

Meanwhile, the first to twelfth display areas A1 to A12 illustrated in FIG. 9 may include a plurality of dummy pixels PXL_D instead of one dummy pixel PXL_D. If this is explained in more detail as follows.

FIG. 10 is a diagram illustrating a fourth specific embodiment of the display panel DSP shown in FIG. 1.

As shown in FIG. 10, it can be seen that three dummy pixels PXL_D are formed in each of the first to twelfth display areas A1 to A12. In this case, the unit compensator corresponding to one display area calculates an average threshold voltage by averaging three threshold voltages Vth111 to Vth113 provided from the three dummy pixels PXL_D. The calculated average threshold voltage is converted into a digital signal, and correction data corresponding to the average threshold voltage converted into the digital signal is selected from the look-up table LUT. 10 may be applied to the data compensator DCB shown in FIG. 8.

Meanwhile, in the structures illustrated in FIGS. 9 and 10, the dummy pixels PXL_D may be covered by the black matrix layer so as not to be exposed to the display screen. In this case, since the dummy pixel PXL_D is not formed in the display areas positioned at the center of the display panel DSP, the structure shown in FIGS. 9 and 10 has a higher aperture ratio than the embodiment shown in FIGS. 3 and 4. You can get it.

11 is a view showing a light emitting display device according to a second embodiment of the present invention.

The light emitting display device according to the second embodiment of the present invention includes a display panel DSP as shown in FIG. 11. A plurality of pixels PXL and reference pixels PXL_R are formed in the display panel DSP. Each of the pixels PXL and the reference pixels PXL_R includes a light emitting diode OLED. The reference pixel PXL_R is selected from any one of the plurality of pixels PXL, and the reference pixel PXL_R has the same structure as the pixel PXL. For example, this reference pixel PXL_R has the same structure as the pixel PXL shown in FIG. 2. However, one terminal of the light emitting diode OLED included in the reference pixels PXL_R is connected to the data compensating part DCB.

The display panel DSP is divided into a plurality of display areas. The plurality of pixels PXL is disposed in a plurality of display areas. The plurality of reference pixels PXL_R are also disposed in a plurality of display areas.

The plurality of pixels PXL and the reference pixels PXL_R are connected to the plurality of scan lines SCL and the plurality of data lines DL.

FIG. 12 illustrates a specific embodiment of the display panel DSP shown in FIG. 11.

As shown in FIG. 12, the display panel DSP is divided into 16 display areas. This is merely an example, and the display panel DSP may be divided into smaller or more display areas. For convenience of explanation, it is assumed that the display panel DSP is divided into sixteen display areas A1 to A16 as shown in FIG. 3.

In each display area A1 to A16, a plurality of pixels PXL and one reference pixel PXL_R are formed. That is, a plurality of pixels PXL and a j th reference pixel PXL_R are formed in the j th display area (j is a natural number smaller than or equal to 16). For example, a plurality of pixels PXL and a first reference pixel PXL_R are formed in the first display area A1.

The reference pixel PXL_R in each display area is a reference index for detecting threshold voltages of the pixels PXL in the corresponding display area. For example, the threshold voltage of the light emitting diode OLED detected from the first reference pixel PXL_R in the first display area A1 is equal to and larger than the first reference pixel PXL_R in the first display area A1. The threshold voltages of the light emitting diodes OLED of each of the pixels PXL are represented. In other words, the present invention does not independently detect the threshold voltage of the light emitting diode OLED for each of the pixels PXL positioned in the first display area A1, but belongs to the first display area A1. Only the threshold voltage of the light emitting diode OLED formed in the first reference pixel PXL_R, which can represent all the pixels PXL, is detected. Then, the detected threshold voltage is set to threshold voltages of the light emitting diodes OLED belonging to all the pixels PXL (all the pixels PXL including the reference pixel PXL_R) located in the first display area A1. Assume as In a similar manner, the threshold voltage of the light emitting diode OLED detected from the second reference pixel PXL_R belonging to the second display area A2 is equal to and larger than the second reference pixel PXL_R of the second display area A2. Representing threshold voltages of the light emitting diodes OLED of each of the pixels PXL, the threshold voltage of the light emitting diode OLED detected from the third reference pixel PXL_R belonging to the third display area A3 is Represents threshold voltages of the light emitting diodes OLED of each of the third reference pixel PXL_R and the plurality of pixels PXL of the third display area A3. The threshold voltage of the light emitting diode OLED detected from the sixteenth reference pixel PXL_R is determined by the sixteenth reference pixel PXL_R of the sixteenth display area A16 and the light emitting diodes OLED of each of the plurality of pixels PXL. Represent the threshold voltages.

The data compensator DCB detects a threshold voltage of the light emitting diode OLED of the jth dummy pixel PXL_D located in the jth display area, and based on the detected threshold voltage, the jth reference located in the jth display area. The data signals to be supplied to the pixel PXL_R and the plurality of pixels PXL are corrected. For example, the data compensator DCB detects a threshold voltage of the light emitting diode OLED in the first reference pixel PXL_R positioned in the first display area A1, and based on the detected threshold voltage, the first correction pixel DCB detects the threshold voltage. Correcting the data signals to be supplied to each of the first reference pixel PXL_R and the plurality of pixels PXL in the display area A1 and in the second reference pixel PXL_R in the second display area A2. The threshold voltage of the light emitting diode OLED is detected, and a data signal to be supplied to each of the second reference pixel PXL_R and the plurality of pixels PXL positioned in the second display area A2 based on the detected threshold voltage. The threshold voltage of the light emitting diode OLED in the sixteenth reference pixel PXL_R located in the sixteenth display area A16 is detected, and the sixteenth display area is determined based on the detected threshold voltage. Data signals to be supplied to each of the sixteenth reference pixel PXL_R and the plurality of pixels PXL positioned in A16 are reported. I decide.

12 may be applied to the data compensator DCB shown in FIG. 4.

That is, the data compensator DCB includes a plurality of unit compensators, as shown in FIG. 4. As shown in the above example, when the number of display areas is sixteen, this unit correction is also composed of sixteen.

The detection switching device DT is controlled according to the control signal CS, and is connected between the j th sensing line and one electrode of the light emitting diode OLED of the j th reference pixel PXL_R. For example, the detection switching element DT included in the first unit correction unit UCR1 corresponding to the first reference pixel PXL_R may include a light emitting diode of the first sensing line SSL1 and the first reference pixel PXL_R. It is connected between the one electrode of (OLED).

The lookup table LUT stores a plurality of preset correction data according to the threshold voltage of the light emitting diode OLED provided in the j-th dummy pixel PXL_D. For example, the lookup table included in the first unit correction unit corresponding to the first reference pixel includes a plurality of preset correction data according to the threshold voltage of the light emitting diode OLED provided in the first reference pixel. do.

These correction data are digital signals, and the value of each of these correction data is set based on the deterioration degree of this dummy light emitting diode OLED_D. That is, as the driving time of the light emitting diode (OLED) increases, the light emitting diode (OLED) deteriorates and its threshold voltage gradually increases, and the correction data are used to compensate for the increase in the threshold voltage. It is set based on the size. Therefore, as the threshold voltage increases, the size of the compensation data corresponding thereto also increases.

The correction unit CR receives the threshold voltage of the light emitting diode OLED from the jth sensing line. The threshold voltage is then converted into a digital signal. The correction data corresponding to the threshold voltage converted into the digital signal is selected from the lookup table (LUT), and based on the selected correction data, the j th reference pixel PXL_R and the plurality of pixels PXL of the j th display area are selected. To correct the data signals to be supplied. Specifically, the correction unit CR corrects data signals to be supplied to the j th reference pixel PXL_R and the plurality of pixels PXL of the j th display area by using the correction gradation data included in the selected correction data. do. For example, the correction unit CR included in the first unit correction unit corresponding to the first reference pixel may have a lookup table LUT based on the threshold voltage of the light emitting diode OLED provided from the first sensing line SSL1. ) And corrects data signals to be supplied to the first reference pixel PXL_R and the plurality of pixels PXL of the first display area A1 based on the selected correction data.

Meanwhile, each of the detection switching elements DT included in each unit compensator is commonly supplied with the same control signal CS. The control signal CS is supplied to the detection switching elements DT included in the first to sixteenth unit corrections before the data signals are supplied to all the pixels PXL of all the display areas. That is, in the present invention, the threshold voltage is detected before the data signals are applied to the pixel PXL, the data signals are first corrected, and then the corrected data signals are supplied to the pixel PXL. The control signal CS is output between every frame period. Specifically, the control signal CS is output between the end time of the n-1th frame (n is a natural number) and the start time of the nth frame.

In addition, the data correction unit DCB shown in FIG. 5 may be applied to the structure of FIG. 12.

As shown in FIG. 5, the data compensator DCB includes a plurality of unit compensators and a lookup table LUT. As shown in the above example, when the number of display areas is sixteen, this unit correction is also composed of sixteen. In the lookup table LUT, as described above, a plurality of preset correction data are stored according to the threshold voltage of the light emitting diode OLED provided in one of the reference pixels PXL_R.

One unit correction unit includes a detection switching element DT and a correction unit CR.

The detection switching device DT is controlled according to the control signal CS, and is connected between the jth sensing line and one electrode of the dummy light emitting diode OLED_D of the jth reference pixel PXL_R. For example, the detection switching device DT included in the first unit compensator corresponding to the first reference pixel PXL_R may include the light emitting diode OLED of the first sensing line SSL1 and the first reference pixel PXL_R. Is connected between the electrodes on one side.

The correction unit CR receives the threshold voltage of the light emitting diode OLED from the jth sensing line. The threshold voltage is then converted into a digital signal. The correction data corresponding to the threshold voltage converted into the digital signal is selected from the lookup table (LUT), and based on the selected correction data, the j th reference pixel PXL_R and the plurality of pixels PXL of the j th display area are selected. Correct the data signals to be supplied to the fields. Specifically, the correction unit CR corrects data signals to be supplied to the j th reference pixel PXL_R and the plurality of pixels PXL of the j th display area by using the correction gradation data included in the selected correction data. do.

In the structure of FIG. 12, a plurality of pixels PXL instead of one pixel PXL may be set as the reference pixel PXL_R in each display area. For example, three pixels PXL of the pixels PXL positioned in the first display area A1 may be set as the reference pixel PXL_R. In this case, the unit compensator corresponding to one display area calculates an average threshold voltage by averaging three threshold voltages provided from the three reference pixels PXL_R. The calculated average threshold voltage is converted into a digital signal, and correction data corresponding to the average threshold voltage converted into the digital signal is selected from the look-up table LUT.

In the structure of FIG. 12, the reference pixels PXL_R may not be set in the display areas A1 to A4, A5, A9, A8, and A12 to A16 positioned at the edges. That is, as illustrated in FIG. 9 described above, the reference pixels PXL_R may not be set in the central display areas.

According to the structure of FIG. 12, the reference pixels PXL_R do not need to be covered by the black matrix layer because the reference pixels PXL_R are pixels PXL that display images in the same manner as the general pixels PXL. Therefore, the structure of FIG. 12 is advantageous for improving the aperture ratio.

As described above, in the present invention, the display panel DSP is divided into a plurality of display areas, and the threshold voltage is determined using the dummy pixel PXL_D (or the reference pixel PXL_R) representing the pixels PXL of each display area. As a result, the lookup table LUT may be configured with a smaller number than the conventional technology of detecting the threshold voltages of all the pixels PXL. In addition, the time for detecting these threshold voltages can be shortened. For example, when comparing the present invention which detects a threshold voltage by dividing the display panel DSP into nine display areas and the conventional technology, a 120 Hz driving light emitting display device having a Full HD (1920 * 1080) resolution In the present invention, the threshold voltage detection time is reduced by about 1.44 * 10 ^-6 times as compared with the prior art, and in the 240Hz driving type light emitting display device having a Full HD (1920 * 1080) resolution, the present invention is compared with the conventional technology. The voltage detection time was reduced by about 1.5 * 10 ^-6 times.

In addition, according to the structure of the present invention it is possible to reduce the number of scan drive integrated circuit (IC) included in the scan driver for driving the scan lines (SCL). That is, in the present invention, since the threshold voltage is detected using only one control signal CS, it is advantageous to reduce the number of scan drive ICs outputting the control signal CS and the scan signals.

In addition, according to the structure of the present invention, since the structure of the pixel PXL can be configured using two transistors and one capacitor, a conventional compensation circuit is formed for each pixel PXL, which includes a large number of transistors. Compared with the technique described above, the aperture ratio of the pixel PXL can be significantly increased. Accordingly, since the luminance of the light emitting diode OLED can be set relatively low, power consumption can be reduced.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

PXL_D: dummy pixel PXL: pixel
SCL: Scan Line DL: Data Line
A: Display area DSP: Display panel

Claims

A plurality of pixels including a light emitting diode;
At least one dummy pixel including a dummy light emitting diode;
A display panel on which the plurality of pixels and at least one dummy pixel are formed; And
And a data compensator for detecting a threshold voltage of the dummy light emitting diode provided in the at least one dummy pixel and correcting data signals to be supplied to the plurality of pixels based on the detected threshold voltage. Display.

The method of claim 1,
The display panel is partitioned into first to i-th display areas (i is a natural number greater than 1);
The plurality of pixels are arranged in the first to i-th display areas;
The dummy pixel includes first to i-th dummy pixels;
A jth dummy pixel is formed in the jth display area; And,
The data compensator detects a threshold voltage of the dummy light emitting diode of the jth dummy pixel located in the jth display area (j is a natural number less than or equal to i), and based on the detected threshold voltage, the data compensator is located in the jth display area. And a data signal to be supplied to the pixels.

The method of claim 2,
The data compensator comprises first to i-th unit compensators; And,
J j unit correction,
A detection switching device controlled according to a control signal and connected between the j th sensing line and one electrode of the dummy light emitting diode of the j th dummy pixel;
A lookup table in which a plurality of preset correction data are stored according to a threshold voltage of a dummy light emitting diode of the jth dummy pixel; And
The correction data is selected from the lookup table based on the threshold voltage of the dummy light emitting diode provided from the jth sensing line, and the data signals to be supplied to the pixels of the jth display area are corrected based on the selected correction data. A light emitting display device comprising a correction unit.

The method of claim 2,
The data compensator comprises first to i-th unit compensators and a lookup table;
A plurality of preset correction data are stored in the lookup table according to a threshold voltage of a light emitting diode provided in one dummy pixel; And,
J j unit correction,
A detection switching device controlled according to a control signal and connected between the j th sensing line and one electrode of the dummy light emitting diode of the j th dummy pixel; And
The correction data is selected from the lookup table based on the threshold voltage of the dummy light emitting diode provided from the jth sensing line, and the data signals to be supplied to the pixels of the jth display area are corrected based on the selected correction data. A light emitting display device comprising a correction unit.

The method according to any one of claims 3 and 4,
Detection switching elements included in each of the first to i-th unit compensators receive the control signal in common; And,
And the control signal is supplied to the detection switching elements included in the first to i-th unit compensators before the data signals are supplied to the pixels.

The method according to any one of claims 3 and 4,
And one correction data includes a plurality of gray level correction data set for each gray level of the data signal.

The method according to any one of claims 3 and 4,
And the j-th dummy pixel is provided with a data signal supplied to any one of pixels included in the j-th display area that is located close to the j-th dummy pixel.

The method of claim 1,
The display panel is partitioned into first to i-th display areas (i is a natural number greater than 1);
First to kth display areas are positioned along a circumference of an edge of the display panel;
Located at the center of the display panel such that the remaining k + 1 to i th display areas are surrounded by the first to k th display areas;
The plurality of pixels are arranged in the first to i-th display areas;
The dummy pixel includes first to kth dummy pixels (k is a natural number smaller than i);
J-th dummy pixel is formed in j-th display area (j is a natural number less than or equal to k); And,
The data compensator detects a threshold voltage of the dummy light emitting diode of the jth dummy pixel located in the jth display area, and corrects data signals to be supplied to the pixels located in the jth display area based on the detected threshold voltage. And correct data signals to be supplied to pixels in at least one of the k + 1 to i-th display areas.

The method of claim 8,
The data compensator comprises first to kth unit compensators; And,
J j unit correction,
A detection switching device controlled according to a control signal and connected between the j th sensing line and one electrode of the dummy light emitting diode of the j th dummy pixel;
A lookup table in which a plurality of preset correction data are stored according to a threshold voltage of a dummy light emitting diode of the jth dummy pixel; And
The correction data is selected from the lookup table based on the threshold voltage of the dummy light emitting diode provided from the jth sensing line, and the data signals to be supplied to the pixels of the jth display area are corrected based on the selected correction data. And a correction unit configured to correct data signals to be supplied to pixels positioned in at least one of the k + 1 to i th display areas.

The method of claim 1,
At least one pixel of the plurality of pixels,
A data switching device for transmitting a data signal from a data line in accordance with a scan signal;
A driving switching device for generating a driving current based on the data signal from the data switching device and supplying the driving current to the light emitting diode; And
And a storage capacitor connected between the gate electrode and the source electrode of the driving switching element.

11. The method of claim 10,
The at least one dummy pixel,
A dummy data switching device for transmitting a data signal from the data line according to the scan signal;
A dummy driving switching device for generating a driving current based on a data signal from the dummy data switching device and supplying the driving current to the dummy light emitting diode; And
And a dummy storage capacitor connected between the gate electrode and the source electrode of the dummy driving switching element.

A plurality of pixels including a light emitting diode;
A display panel on which the plurality of pixels are formed; And
The at least one pixel is set as a reference pixel, a threshold voltage of the light emitting diode included in the reference pixel is detected, and data signals to be supplied to a plurality of pixels including the reference pixel are detected based on the detected threshold voltage. A light emitting display device comprising a data compensator for calibrating.

13. The method of claim 12,
The display panel is partitioned into first to i-th display areas (i is a natural number greater than 1);
A plurality of pixels including the reference pixel is disposed in the first to i-th display areas;
The reference pixel includes first to i th reference pixels;
A j th reference pixel is formed in the j th display area; And,
The data correction unit detects a threshold voltage of the light emitting diode of the jth reference pixel located in the jth display area (j is a natural number less than or equal to i), and based on the detected threshold voltage, and a data signal to be supplied to the j reference pixel and the plurality of pixels positioned in the j th display area.

The method of claim 13,
The data compensator comprises first to i-th unit compensators; And,
J j unit correction,
A detection switching element controlled according to a control signal and connected between the j th sensing line and one electrode of the light emitting diode of the j th reference pixel;
A lookup table in which a plurality of preset correction data are stored according to a threshold voltage of a light emitting diode included in the j th reference pixel; And
Based on the threshold voltage of the light emitting diode provided from the jth sensing line, correction data is selected from the lookup table, and based on the selected correction data, the jth reference pixel and the jth display positioned in the jth display area And a correction unit for correcting data signals to be supplied to the plurality of pixels positioned in the region.

The method of claim 13,
The data compensator comprises first to i-th unit compensators and a lookup table;
A plurality of preset correction data are stored in the lookup table according to the threshold voltage of the light emitting diode included in any one reference pixel; And,
J j unit correction,
A detection switching element controlled according to a control signal and connected between the j th sensing line and one electrode of the light emitting diode of the j th reference pixel; And
The correction data is selected from the lookup table based on the threshold voltage of the light emitting diode provided from the jth sensing line, and the jth reference pixel and the jth display area of the jth display area are selected based on the selected correction data. And a correction unit for correcting data signals to be supplied to the pixels of the pixel.

The method according to any one of claims 14 and 15,
Detection switching elements included in each of the first to i-th unit compensators receive the control signal in common; And,
And the control signal is supplied to the detection switching elements included in the first to i-th unit compensators before the data signals are supplied to the pixels.

The method according to any one of claims 14 and 15,
And one correction data includes a plurality of gray level correction data set for each gray level of the data signal.

13. The method of claim 12,
At least one pixel of the plurality of pixels,
A data switching device for transmitting a data signal from a data line in accordance with a scan signal;
A driving switching device for generating a driving current based on the data signal from the data switching device and supplying the driving current to the light emitting diode; And
And a storage capacitor connected between the gate electrode and the source electrode of the driving switching element.