KR100826004B1 - Light emitting device and method of driving the same - Google Patents

Abstract

The present invention relates to a light emitting device in which comb marks and cross-talk phenomena do not occur. The light emitting device includes a panel and a driver. The panel includes a plurality of subpixels formed in regions where data lines and scan lines intersect. The driver drives the panel in units of N (an integer of 2 or more). The light emitting device converts the first display data into second display data during a predetermined frame in consideration of both the total current value flowing through the scan line and the corresponding resistance that affect the luminance of the subpixels, thereby forming a comb pattern and a cross on the panel. Torque does not occur.

Light Emitting Diode, Organic Electroluminescent Device, Comb Pattern, Cross-talk

Description

LIGHT EMITTING DEVICE AND METHOD OF DRIVING THE SAME}

1 is a plan view showing a conventional light emitting device.

2A through 2C are circuit diagrams illustrating a process of driving the light emitting device of FIG. 1.

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

4A through 4C are circuit diagrams illustrating a process of driving the light emitting device of FIG. 3.

5A is a flowchart illustrating a process of setting various parameters for removing a comb fringe according to an exemplary embodiment of the present invention.

5B is a plan view illustrating a screen structure of a panel according to the set parameters.

6a to 6i are views illustrating a comb pattern removing process according to an exemplary embodiment of the present invention.

7 is a flowchart illustrating a process of setting various parameters for cross-talk prevention according to an exemplary embodiment of the present invention.

8A to 8I are cross-sectional views illustrating a cross-talk phenomenon removing process according to an exemplary embodiment of the present invention.

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

The present invention relates to a light emitting device and a method of driving the same, and more particularly, to a light emitting device and a method of driving the same that the comb pattern and cross-talk phenomenon does not occur.

The light emitting element generates light having a predetermined wavelength when a predetermined current or voltage is provided.

1 is a plan view showing a conventional light emitting device.

Referring to FIG. 1, a conventional light emitting device includes a panel 100, a controller 102, a first scan driver 104, a second scan driver 106, and a data driver 108.

The panel 100 includes a plurality of subpixels E11 to E64 formed in emission areas where the data lines D1 to D6 and the scan lines S1 to S4 cross each other. Here, three sub pixels form one pixel. For example, the pixel 110 includes one red subpixel E11, one green subpixel E21, and one blue subpixel E31.

The controller 102 receives display data from an external device (not shown), and controls the scan drivers 104 and 106 and the data driver 108 using the received display data.

The first scan driver 104 transmits the first scan signals to some of the scan lines S1 to S4, for example, S1 and S3.

The second scan driver 106 transmits the second scan signals to the remaining scan lines S2 and S4.

The data driver 108 includes a plurality of current sources IS1 to IS6, and provides data currents corresponding to the display data and outputted from the current sources IS1 to IS6 to the data lines D1 to D6.

Hereinafter, a process of driving a conventional light emitting device will be described with reference to FIGS. 2A to 2C.

2A through 2C are circuit diagrams illustrating a process of driving the light emitting device of FIG. 1.

First, as shown in FIG. 2A, the first scan line S1 is connected to ground, and the remaining scan lines S2 to S4 have a voltage V1 having the same magnitude as the driving voltage Vcc of the light emitting device. It is connected to a non-light emitting source having a.

Subsequently, data currents I11 to I61 corresponding to the first display data are provided to the data lines D1 to D6. In this case, the data currents I11 to I61 flow to the ground through the data lines D1 to D6, the subpixels E11 to E6l and the first scan line S1, so that the first scan line ( Sub-pixels E11 to E61 associated with S1 emit light.

Subsequently, a second scan line S2 is connected to the ground as shown in FIG. 2B, and the remaining scan lines S1, S3 and S4 are connected to the non-light emitting source.

Thereafter, data currents I12 to I62 corresponding to the second display data input to the controller 102 after the first display data are provided to the data lines D1 to D6 as shown in FIG. 2B. . In this case, the data currents I12 to I62 flow to the ground through the data lines D1 to D6, the subpixels E12 to E62 and the second scan line S2, so that the second scan line ( Sub-pixels E12 to E62 associated with S2 emit light.

Subsequently, a third scan line S3 is connected to the ground as shown in FIG. 2C, and the remaining scan lines S1, S2 and S4 are connected to the non-light emitting source.

Subsequently, data currents I13 to I63 corresponding to the third display data input to the controller 102 after the second display data are provided to the data lines D1 to D6 as shown in FIG. 2C. . In this case, the data currents I13 to I63 flow to the ground through the data lines D1 to D6, the subpixels E13 to E63, and the third scan line S3, so that the third scan line ( Sub pixels E13 to E63 related to S3 emit light.

Through the above method, the subpixels E14 to E64 associated with the fourth scan line S4 emit light. Subsequently, the sub pixels E11 to E64 emit light repeatedly in units of the scan lines S1 to S4, that is, in units of frames, in the same manner as above.

Hereinafter, the luminance difference between the subpixels E11, E12, and E13 will be described. However, since the luminance of the subpixel is affected by the cathode voltage of the subpixel, that is, the data current and the resistance corresponding to the subpixel, first, the resistance between the subpixels E11 to E64 and the ground is examined. I'll see.

2A to 2C, the resistance between the subpixel E11 and the ground is a scan resistance R _S , and the resistance between the subpixel E21 and the ground is R _S + R _P and the sub pixel. The resistance between E31 and the ground is R _S + 2R _P. In addition, the resistance between the subpixel E41 and the ground is R _S + 3R _P , and the resistance between the subpixel E51 and the ground is R _S + 4R _P, and the resistance between the sub pixel E61 and the ground is The resistance is R _S + 5R _P.

In addition, the resistance between the subpixel E12 and the ground is R _S + 5R _P.

Next, the luminance difference between the subpixels E11 and E12 will be described in detail. However, suppose that the data currents I11 to I61 are 3A, 3A, 0A, 0A, 3A, and 3A, respectively, and the data currents I12 to I62 are respectively 3A, 3A, 0A, 0A, 3A, and 3A. . That is, the total amount of current flowing through the first scan line S1 and the total amount of current flowing through the second scan line S2 are the same.

Here, since the cathode voltage has a value corresponding to the product of the resistance between the corresponding subpixel and the ground and the current flowing through the corresponding scan line, the cathode voltage VC11 of the subpixel E11 is shown in FIG. 2A. Similarly, [12A (3A + 3A + 0A + 0A + 3A + 3A) × (R _S )], and the cathode voltage VC21 of the subpixel E21 is [12A (3A + 3A + 0A + 0A + 3A +]. 3A) × (R _S ) + 9A (3A + 0A + 0A + 3A + 3A) × R _P ]. The cathode voltage VC31 of the subpixel E31 is equal to [12A (3A + 3A + 0A + 0A + 3A + 3A) × (R _S ) + 9A (3A + 0A + 0A + 3A + 3A) × R _P. + 6A (0A + 0A + 3A + 3A) × R _P ], and the cathode voltage VC41 of the subpixel E41 is [12A (3A + 3A + 0A + 0A + 3A + 3A) × (R _S ) + 9A (3A + 0A + 0A + 3A + 3A) × R _P + 6A (0A + 0A + 3A + 3A) × R _P + 6A (0A + 3A + 3A) × R _P ]. In addition, the cathode voltage VC51 of the subpixel E51 is [12A (3A + 3A + 0A + 0A + 3A + 3A) × (R _S ) + 9A (3A + 0A + 0A + 3A + 3A) × R _P. + 6A (0A + 0A + 3A + 3A) × R _P + 6A (0A + 3A + 3A) × R _P + 6A (3A + 3A) × R _P ] and the cathode voltage VC61 of the subpixel E61 Silver [12A (3A + 3A + 0A + 0A + 3A + 3A) × (R _S ) + 9A (3A + 0A + 0A + 3A + 3A) × R _P + 6A (0A + 0A + 3A + 3A) × R _P + 6A (0A + 3A + 3A) x R _P + 6A (3A + 3A) x R _P + 3A x R _P ].

Hereinafter, when the cathode voltages VC12 of the pixel E12 related to the second scan line S2 are obtained, the cathode voltage VC12 of the subpixel E12 is [12A (3A + 3A + 0A + 0A + 3A). + 3A) × (R _S ) + 9A (3A + 0A + 0A + 3A + 3A) × R _P + 6A (0A + 0A + 3A + 3A) × R _P + 6A (0A + 3A + 3A) × R _P + 6A (3A + 3A) x R _P + 3A x R _P ].

As described above, the data currents I11 having the same magnitude 3A as the cathode voltage VC12 of the subpixel E12 is greater than the cathode voltage VC11 of the subpixel E11 and equal to the subpixels E11 and E12. And I12, the sub-pixel E12 emits light darker than the sub-pixel E11. This is because the subpixel emits darker light as its cathode voltage increases. That is, even though the data currents I11 and I12 of the same magnitude are provided to the data line D1 so that the subpixels E11 and E12 emit light with the same brightness, the subpixel E12 due to the difference in the corresponding resistances. It emits light darker than this sub pixel E11. In particular, a luminance difference between the subpixels E11 to E61 related to the first scan line S1 and the subpixels E11 and E12 among the subpixels E12 to E62 related to the second scan line S2 and The luminance difference between the sub pixels E61 and E62 is largest. As a result, a contrast difference occurs between the subpixels E11 and E12 and between the subpixels E61 and E62, and this contrast difference causes stripes in the panel 100. FIG. This phenomenon is called comb pattern. That is, the comb pattern occurs between the subpixels associated with the outermost data lines D1 and D6 among the data lines D1 to D6.

Hereinafter, the luminance difference between the subpixels E11 and E13 will be described in detail. Assume the data currents I11 to I61 are 3A, 3A, 0A, 0A, 3A and 3A, respectively, and the data currents I13 to I63 are 3A, 3A, 3A, 3A, 3A and 3A, respectively.

In this case, the cathode voltage VC11 of the subpixel E11 is [12A (3A + 3A + 0A + 0A + 3A + 3A) × (R _S )], and the cathode voltage VC13 of the subpixel E13 is [18A (3A + 3A + 3A + 3A + 3A + 3A) × (R _S )]. That is, the cathode voltage VC13 of the subpixel E13 is greater than the cathode voltage VC11 of the subpixel E11, so that the subpixel E13 emits light darker than the subpixel E11. That is, even though the data currents I11 and I13 of the same magnitude are provided to the data line D1 so that the subpixels E11 and E13 emit light with the same luminance, the difference in the total amount of current flowing through the corresponding scan line. Therefore, the subpixel E11 emits light brighter than the subpixel E13. This phenomenon is called a cross-talk phenomenon.

It is a first object of the present invention to provide a light emitting device in which a comb pattern is not generated and a method of driving the same.

It is a second object of the present invention to provide a light emitting device in which a cross-talk phenomenon does not occur and a method of driving the same.

In order to achieve the above object, a light emitting device according to an embodiment of the present invention includes a panel and a driver. The panel includes a plurality of subpixels formed in regions where data lines and scan lines intersect. The driver drives the panel in units of N (an integer of 2 or more).

A driver for driving a panel including a plurality of subpixels formed in regions where data lines and scan lines cross each other according to an exemplary embodiment of the present invention includes a controller, a frame unit, and a data driver. The controller receives first display data corresponding to N frames (integer of 2 or more) from an external device. The frame unit analyzes first display data provided from the controller to detect the total amount of current flowing through each scan line in units of N frames, and lowers the level of the first display data according to the detection result. 2 Create display data. The data driver provides data currents corresponding to the generated second display data to the data lines.

A method of driving a light emitting device having a panel including a plurality of subpixels formed in regions where data lines and scan lines cross each other according to an exemplary embodiment of the present invention is provided in one scan line through first display data. Detecting the total amount of current flowing in units of N (an integer of 2 or more); And generating second display data by adjusting levels of the first display data in units of N frames according to the detection result.

The light emitting device and the method of driving the same according to the present invention change first display data into second display data during a predetermined frame in consideration of both a total current value flowing through a scan line and a corresponding resistance that affect the luminance of subpixels. Therefore, the comb pattern and the cross-talk phenomenon do not occur in the panel.

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

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

Referring to FIG. 3, the light emitting device of the present invention includes a panel 300 and a driver.

The driver includes a controller 302, a first scan driver 304, a second scan driver 306, a frame 308, and a data driver 310.

The light emitting device according to the preferred embodiment of the present invention includes an organic electroluminescent device (PDP), a plasma dispaly panel (PDP), a liquid crystal display (LCD), and the like. However, hereinafter, the organic EL device will be described as an example for convenience of description.

The panel 300 is a device for displaying a predetermined image and includes a plurality of subpixels E11 to Em4 formed in regions where the data lines D1 to Dm and the scan lines S1 to S4 intersect. do. Here, according to an embodiment of the present invention, three subpixels form one pixel 312. For example, a red subpixel generating red light, a green subpixel generating green light and a blue subpixel generating blue light form one pixel 312, so that pixel 312 is the subpixel. These are combined to generate light of various colors.

According to another embodiment of the present invention, one pixel may be composed of a red subpixel, a green subpixel, a blue subpixel, and a white subpixel generating white light.

When the light emitting device is an organic electroluminescent device, the subpixel includes an anode electrode layer, an organic material layer made of an organic material, and a cathode electrode layer sequentially stacked on a substrate. Thus, when a positive voltage is provided to the anode electrode layer and a negative voltage is provided to the cathode electrode layer, the organic material layer emits light having a predetermined wavelength.

The controller 302 receives first display data from an external device (not shown), and preferably stores the received first display data. In addition, the controller 302 transmits the received first display data to the frame unit 308.

The first scan driver 304 transmits the first scan signals to some of the scan lines S1 to S4, for example, S1 and S3.

The second scan driver 306 transmits second scan signals to the remaining scan lines S2 and S4.

The frame unit 308 detects total current values flowing through the scan lines S1 to S4 through the first display data transmitted from the controller 302 in units of N (an integer of 2 or more). Thereafter, the frame unit 308 adjusts the levels of the first display data according to the detection result to generate second display data. Here, one frame means one screen displayed on the panel 300, that is, one screen driven from the first scan line S1 to the fourth scan line S4. Detailed description thereof will be described below with reference to the accompanying drawings.

The data driver 310 includes a plurality of current sources IS1 to ISm, which correspond to the second display data and output data currents output from the current sources IS1 to ISm to the data lines D1 to Dm. So that the sub pixels E11 to Em4 emit light.

Hereinafter, a process of driving the light emitting device of the present invention will be described with reference to FIGS. 4A to 4C.

4A through 4C are circuit diagrams illustrating a process of driving the light emitting device of FIG. 3.

First, as shown in FIG. 4A, the first scan line S1 is connected to a light emitting source, preferably ground, and the remaining scan lines S2 to S4 are equal to the driving voltage Vcc of the light emitting device. It is connected to a non-light emitting source having a voltage V1 of magnitude. Here, the light emitting source is not limited to ground, and various elements such as a zener diode may be used.

Subsequently, data currents I11 to Im1 corresponding to the 2-1 display data generated by the frame unit 308 are provided to the data lines D1 to Dm. In this case, the data currents I11 to Im1 flow through the data lines D1 to Dm, the subpixels E11 to Eml, and the first scan line S1 to the light emitting source, so that the first scan line Sub-pixels E11 to Em1 associated with S1 emit light.

Subsequently, a second scan line S2 is connected to the light emitting source, and the remaining scan lines S1, S3 and S4 are connected to the non-light emitting source.

Thereafter, the data currents I12 to Im2 corresponding to the 2-2 display data generated from the frame unit 308 after the 2-1th display data are shown in FIG. 4B, as shown in FIG. 4B. Dm). In this case, the data currents I12 to Im2 flow through the data lines D1 to Dm, the subpixels E12 to Em2 and the second scan line S2 to the light emitting source, so that the second scan line Sub-pixels E12 to Em2 associated with (S2) emit light.

Subsequently, a third scan line S3 is connected to the light emitting source, and the remaining scan lines S1, S2 and S4 are connected to the non-light emitting source.

Subsequently, the data currents I13 to Im3 corresponding to the second to second display data generated from the frame unit 308 after the second to second display data are shown in FIG. 4C, as illustrated in FIG. 4C. Dm). In this case, the data currents I13 to Im3 flow through the data lines D1 to Dm, the subpixels E13 to Em3 and the third scan line S3 to the light emitting source, so that the third scan line Sub-pixels E13 to Em3 related to S3 emit light.

Through the above method, the subpixels E14 to Em4 associated with the fourth scan line S4 emit light. Subsequently, the pixels E11 to Em4 repeatedly emit light in units of the scan lines S1 to S4, that is, in units of frames, in the same manner as described above.

In short, the light emitting device of the present invention converts the second display data generated by converting the first display data so as to prevent combing and cross-talk without using first display data input from an external device. use. Preferably, the light emitting device according to the present invention generates second display data by lowering the level of the first display data, and sub-pixels E11 to Em4 are generated using the generated second display data. It emits light. Details thereof will be described below with reference to the accompanying drawings.

5A is a flowchart illustrating a process of setting various parameters for removing the comb fringe according to an exemplary embodiment of the present invention, and FIG. 5B is a plan view illustrating a screen structure of a panel according to the set parameters.

Referring to FIG. 5A, first, a current variable is determined by summing the total amount of current flowing in each scan line in units of a predetermined frame (for example, eight frames) (S500). For example, the sum of the total current flowing in the first scan line S1 in the first frame to the total current flowing in the first scan line S1 in the eighth frame is added to the first scan line S1 for eight frames. Calculate the sum of the total amount of current.

Subsequently, the frame unit 308 determines the pattern shape parameter through the sum of the total amount of current (S502). For example, when the sum of the total amount of current of the corresponding scan line (for example, S1) is large and the luminance difference of the subpixels E11 to Em1 associated with the scan line S1 is large, the panel 300 may be located in the area of the panel 300. Regions A1 to A3 corresponding to scan line S1 are subdivided into regions as shown in FIG. 5B. On the other hand, when the sum of the total amount of current of the corresponding scan line (for example, S2) is small and the luminance difference of the subpixels E12 to Em2 related to the scan line S2 is small, the scan line in the panel 300 region The areas A4 and A5 corresponding to (S2) are less separated or not separated.

Subsequently, the level constant is determined according to the total amount of current and the pattern form (S504). As described in the prior art, the comb fringe is generated by the luminance difference between pixels associated with neighboring scan lines. Accordingly, the light emitting device of the present invention lowers the level of the first display data associated with the pixel to reduce the brightness of the brighter pixel among the pixels associated with the neighboring scan lines, and thus has the second display data having the down level. And generates a data current corresponding to the generated second display data to the pixel. As a result, the luminance of the pixels can be the same. However, the light emitting device of the present invention does not continuously compensate the luminance difference of the pixels for each frame, but compensates for the luminance difference of the pixels in units of a plurality of frames. This is because people do not individually recognize images displayed on the panel 300 for each frame due to the visual characteristics of a person, but recognize a plurality of frames as one. For example, when the luminance difference of the pixels has a three level difference for eight frames, the light emitting device of the present invention has a level constant such that the luminance level of the pixel having the higher luminance among the pixels is arbitrarily lowered three levels for eight frames. Is set to 3.

Subsequently, the frame rate control variable is set (S506), and then the frame level control variable is set (S508). This will be described in detail with reference to FIGS. 6A to 6I.

6a to 6i are views illustrating a comb pattern removing process according to an exemplary embodiment of the present invention.

First, the variables as shown in FIG. 6A are set so that the comb fringe can be removed, that is, no luminance difference of pixels associated with neighboring scan lines occurs.

First, the variables related to the first scan line S1 will be described.

The frame unit 308 determines the pattern as shown in FIG. 6B by summing the total current values flowing in the first scan line S1, that is, the area associated with the first scan line S1 is divided into areas A1, A2, and A3. To separate.

Subsequently, the pattern, the frame rate, and the frame level are set in consideration of the total current amount and the resistances corresponding to the first scan line S1.

The first scan line S1 is formed in the left direction of the panel 300 so that the unit resistance corresponding to A1 is smaller than the unit resistance corresponding to the other regions A2 and A3, so that data currents of the same magnitude are equal to A1 to When provided to A3, A1 emits light brighter than areas A2 and A3, so the pattern is set to the left. That is, since the area located on the left side is brighter, the luminance level of the A1 area is lowered most, the luminance of the A2 area is lowered to an intermediate level, and the luminance level of the A3 area is not changed.

Next, when the frame rate is 2 and the frame level is 2, it means that the luminance of the corresponding area is reduced by two levels during two of the eight frames. As a result, the frame portion 308 sets the luminance level of the first display data R _d G _d B _d during two frames, that is, during the fourth and eighth frames, as shown in FIGS. 6E and 6I. Lower the level. As a result, the luminance level of the subpixels present in the area A1 is lowered by two levels as R _{d -2} G _{d -2} B _{d -2} , and the luminance level of the subpixels present in the area A2 is reduced to R _{d -1} G _{d- .} Lowered by 1 level as ₁ B _{d -1} . Therefore, the luminances of the areas A1 to A3 corresponding to the first scan line S1 in the area of the panel 300 are the same.

Second, look at the variables associated with the second scan line (S2).

The frame unit 308 determines the pattern as shown in FIG. 6B by adding the total current values flowing through the second scan line S2, that is, dividing the region associated with the second scan line S2 into regions A4 and A5. do.

Subsequently, in consideration of the total current amount and the resistances corresponding to the second scan line S2, a pattern, a frame rate, and a frame level are set as follows.

A second scan line S2 is formed in the right direction of the panel 300 so that the unit resistance corresponding to A5 is smaller than the unit resistance corresponding to the area A4, so that when the same current data currents are provided to A4 and A5, A5 The area emits light brighter than the A4 area. Therefore, the pattern is set to right.

Next, when the frame rate is 3 and the frame level is 1, the luminance of the corresponding area is lowered by one level for three frames out of eight frames. As a result, the frame portion 308 is configured to display the first display data R _d G _d B during three frames, that is, during the second frame, the fourth frame, and the eighth frame, as shown in FIGS. 6C, 6E, and 6I. _d ) lowers the luminance level by one level. As a result, the luminance level of the subpixels present in the area A5 is lowered by one level as R _{d -1} G _{d -1} B _{d -1} for the second, fourth and eight frames. Therefore, the luminances of the regions A4 and A5 corresponding to the second scan line S1 in the region of the panel 300 are the same.

Hereinafter, the luminance of the regions A1 to A3 corresponding to the first scan line S1 and the luminance of the regions A4 and A5 corresponding to the second scan line S2 will be compared.

The luminance of a subpixel is affected by the total current value flowing in the corresponding scan line and the resistance corresponding to the subpixel. As a result, in the conventional light emitting device, when the subpixels corresponding to the first scan line S1 and the second scan line S2 are provided with the same magnitude of data current, for example, E11 and E12, the subpixel Due to the difference in the resistances corresponding to the fields E11 and E12, E11 emits light brighter than E12, causing a comb pattern between the subpixels E11 and E12.

On the other hand, in the light emitting device of the present invention, since E11 emits light brighter than E12, the frame part 308 is configured to provide the second data current provided to E11 when the first data currents having the same magnitude are provided to the controller 302. The level of the first data current corresponding to E11 is lowered such that I11 is smaller than the second data current I12 provided to E12. However, the light emitting device of the present invention lowers the level of the first data current corresponding to E11 through a predetermined frame, for example, all eight frames. As a result, the luminance of E11 and E12 becomes the same, so that no combing occurs between the sub pixels E11 and E12.

In the above, the case where the magnitudes of the first data currents are the same is described. However, even when the magnitudes of the first data currents are different, not only the corresponding resistors but also the magnitudes of the first data currents are considered. The luminance difference does not occur between the subpixels E11 to Em1 corresponding to) and the subpixels E12 to Em2 corresponding to the second scan line S2.

In the same manner as described above, the frame part 308 sets a pattern, a frame rate, and a frame level corresponding to the third scan line S3 and the fourth scan line S4 so that a comb fringe does not occur.

7 is a flowchart illustrating a process of setting various parameters for cross-talk prevention according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the current variable is determined by summing the total amount of current flowing through each scan line in units of a predetermined frame (for example, eight frames) (S700).

Subsequently, the frame unit 308 determines the load variable through the first display data (S702).

Subsequently, the frame portion 308 determines the level constant to be adjusted for eight frames (S704).

Subsequently, the frame unit 308 sets the frame rate control variable to match the level constant (S706), and then sets the frame level control variable (S708).

Hereinafter, the variable setting process and the cross-talk removing process of FIG. 7 will be described in detail with reference to FIGS. 4A, 4C, and 8A to 8I.

8A to 8I are cross-sectional views illustrating a cross-talk phenomenon removing process according to an exemplary embodiment of the present invention. However, among the first display data associated with the first scan line S1, the data currents corresponding to the 1-2 display data and the 1-3 display data are 0A, and the data currents corresponding to the remaining first display data are 0A. Let's say 3A. Further, suppose that the data currents corresponding to the first display data associated with the third scan line S3 are 3A. Assume that the first display data set as described above are input to the controller 302 in the same way for eight frames.

First, the frame unit 308 is configured such that the total current value flowing in the third scan line S3 through the first display data provided from the controller 302 flows in the third scan line S3 during the eight frames. Detect the fact that it is greater than

Subsequently, the frame unit 308 sets the luminance of the subpixels E11 to Em1 related to the first scan line S1 according to the detection result, and the subpixels E13 to Em3 associated with the third scan line S3. Lower than the luminance of. This is because the subpixel associated with the first scan line S1, for example E11, emits lighter than the subpixel associated with the third scan line S3, for example E13. For example, as illustrated in FIG. 8A, the frame unit 308 lowers the luminance of the subpixels E11 to Em1 related to the first scan line S1 by 4 levels for 8 frames, and decreases the third scan line S3. ) Decreases the luminance of the sub pixels E13 to Em3 by six levels.

According to an exemplary embodiment of the present invention, the frame unit 308 determines the luminance of the subpixels E11 to Em1 related to the first scan line S1, as shown in FIGS. 8A to 8I. (4th frame and 8th frame) respectively down two levels, and the luminance of the subpixels E13 to Em3 associated with the third scan line S3 is reduced to 6 out of 8 frames as shown in FIGS. 8A to 8I. One level down during the frame (second to fourth frames, sixth to eighth frames), respectively.

The light emitting device of the present invention maintains the same luminance of the sub-pixels associated with the scan lines even when the total current flowing through the scan lines is different by using the above-described method, and as a result, the cross-section in the panel 300 Torque phenomenon does not occur.

In the above, the subpixels E11 to Em1 associated with the first scan line S1 are compared with the subpixels E13 to Em3 associated with the third scan line S3, and thus the subpixels E11 to Em1. The resistors corresponding to the resistors and the resistors corresponding to the subpixels E13 to Em3 were the same. However, the resistances associated with the scan lines may be different, and in this case, since the frame rate and the frame level are set in consideration of the difference in the resistances, the cross-talk phenomenon does not occur in the panel 300.

In other words, the light emitting device of the present invention changes the first display data into the second display data in consideration of both the total current value flowing through the scan line and the corresponding resistance which affect the luminance of the subpixel, and thus the comb pattern on the panel 300. And no cross-talk phenomenon occurs.

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

Referring to FIG. 9, the light emitting device of the present invention includes a panel 900, a controller 902, a scan driver 904, a frame 906, and a data driver 908.

The remaining components except for the scan driver 904 are the same as the components of the first embodiment, and thus the description thereof is omitted.

Unlike the first embodiment, the scan driver 904 transmits scan signals to the scan lines S1 to S4 in one direction.

Preferred embodiments of the invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention will be capable of various modifications, changes, additions within the spirit and scope of the present invention, such modifications, changes And additions should be considered to be within the scope of the following claims.

As described above, the light emitting device and the method of driving the same according to the present invention remove the first display data during the predetermined frame in consideration of both the total current value flowing through the scan line and the corresponding resistance which affect the luminance of the subpixels. Since the display data is changed into two display data, the comb pattern and the cross-talk phenomenon do not occur in the panel.

Claims (21)

A panel including a plurality of subpixels formed in regions where the data lines and the scan lines cross each other; A driver for driving the panel in units of N (an integer of 2 or more);  The driver may include a controller to receive first display data from an external device; A frame unit configured to analyze display data provided from the controller to detect the total amount of current flowing in each scan line in units of N frames, and to change the first display data into second display data according to the detection result; And And a data driver configured to provide data currents corresponding to the changed second display data to the data lines. delete The light emitting device of claim 1, wherein the frame unit adjusts a level corresponding to the first display data to generate the second display data. The apparatus of claim 3, wherein the frame unit divides a region corresponding to one scan line among the panel regions into a plurality of regions according to the detection result, respectively adjusts a level for each of the separated regions, and adjusts the adjusted level. The light emitting device has a second generation of display data. The light emitting device of claim 4, wherein the regions are adjusted in a predetermined direction according to a direction of a corresponding scan line. 6. The light emitting device according to claim 5, wherein the level of the region closest to the light emitting source is most down. The light emitting device of claim 3, wherein the second display data has a level less than or equal to a level of the first display data. The method of claim 1, wherein the frame unit determines a level adjustment constant of a region corresponding to one scan line of the region of the panel according to the detection result, divides the determined level adjustment constant into N frames, and sets the determined level adjustment constant. And generating second display data according to the setting. The light emitting device according to claim 1, wherein N is eight. The method of claim 1, wherein the light emitting element, And a scan driver for transmitting scan signals to the scan lines. The light emitting device of claim 1, wherein the at least one subpixel includes an organic material layer formed of an organic material. A driver for driving a panel including a plurality of sub pixels formed in regions where data lines and scan lines cross each other. A control unit configured to receive first display data corresponding to N (integer 2 or more) frames from an external device; Analyzing the first display data provided from the control unit to detect the total amount of current flowing in each scan line in units of N frames, and down the level of the first display data according to the detection result to reduce the second display data A frame unit to generate; And And a data driver configured to provide data currents corresponding to the generated second display data to the data lines. The display apparatus of claim 12, wherein the frame part divides a region corresponding to one scan line among the regions of the panel into a plurality of regions, respectively, downs a level for each of the separated regions, and reduces the down level. And generating second display data having a. The display apparatus of claim 12, wherein the frame unit determines a level adjustment constant of a region corresponding to one scan line of the region of the panel according to the detection result, and divides the determined level adjustment constant into N frames. And generating second display data according to the setting. A method of driving a light emitting device having a panel including a plurality of subpixels formed in regions where data lines and scan lines cross each other, Detecting the total amount of current flowing in one scan line through the first display data in units of N (an integer of 2 or more); And And generating second display data by adjusting the levels of the first display data in units of N frames according to the detection result. The method of claim 15, wherein the second display data has a level less than or equal to a level of the first display data. The method of claim 15, wherein generating the second display data comprises: Dividing a region corresponding to the scan line in which the amount of current is detected among the regions of the panel into a plurality of regions according to the detection result; Individually adjusting levels for each of the separated regions; And Generating the second display data having the adjusted level. 18. The method of claim 17, wherein the levels of the regions are adjusted in a predetermined direction according to the direction of the scan line in which the amount of current is detected. 19. The method of claim 18, wherein the level of the region closest to the light emitting source is most down. The method of claim 15, wherein generating the second display data comprises: Determining a level adjustment constant corresponding to all N frames according to the detection result; Dividing and setting the determined level adjustment constant into N frames; And Generating the second display data according to the setting. The method of claim 15, wherein the light emitting element driving method, Providing data currents corresponding to the second display data to the data lines; And And transmitting scan signals to the scan lines.

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