KR20060031550A - Light emitting display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display device in which a voltage drop of a power supply line is made uniform so that light emission luminance can be made uniform.

A light emitting display device according to the present invention includes an image display unit including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines, a first power supply line for supplying a driving voltage to each pixel from one side of the image display unit, A second power line for supplying the driving voltage to the pixels on the other side of the image display unit, a third power line for supplying the driving voltage to one side of the first and second power lines, and the first and second power lines A fourth power line for supplying the driving voltage to the other side, a plurality of first power connection lines for electrically connecting one side of each of the third and fourth power lines to the first power line, and the third and fourth power sources A plurality of second power supply connecting line for electrically connecting the other side of the line to the second power supply line.

With this arrangement, the present invention can make the current supplied to each pixel uniform by making the pixel driving voltages supplied to both ends of the pixel power line the same. Accordingly, in the present invention, a uniform current flows through the entire image display unit, thereby improving the nonuniformity of the image quality, thereby obtaining uniform image quality.

Description

Light emitting display device {LIGHT EMITTING DISPLAY}             

1 illustrates a general light emitting display device.

2 is a diagram illustrating a light emitting display device according to a first embodiment of the present invention.

3 is a diagram illustrating a light emitting display device according to a second embodiment of the present invention.

4 is a diagram illustrating a current distribution according to the position of each pixel illustrated in FIG. 3.

5 is a diagram showing an amount of current supplied to each pixel connected to each scan line shown in FIGS. 2 and 3.

6 is a diagram illustrating a light emitting display device according to another exemplary embodiment.

<Description of the symbols for the main parts of the drawings>

10, 110: substrate 21, 121: pixel

20, 120: image display unit 30, 130: scan driver

40, 140: data driver 50, 150: first power supply line

60, 160: pad portion 152: second power line

154: third power line 156: fourth power line

1531, 1532: a plurality of first power supply lines

1533, 1534: a plurality of second power supply lines

1551 and 1552: a plurality of first power compensation lines

1553, 1554: a plurality of second power compensation lines

170: second pixel power line

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light emitting display device, and more particularly, to a light emitting display device in which a voltage drop of a power line is made uniform so that light emission luminance can be made uniform.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, a light emitting display, and the like.

Among the flat panel displays, a light emitting display device is a self-light emitting device that emits a fluorescent material by recombination of electrons and holes, and includes an inorganic light emitting display device including an inorganic light emitting layer and an organic light emitting layer according to materials and structures. It is roughly divided into. Such a light emitting display device has an advantage of having a fast response speed, such as a cathode ray tube, compared to a passive light emitting device requiring a separate light source like a liquid crystal display device.

1 illustrates a general light emitting display device.

Referring to FIG. 1, a general light emitting display device is disposed in a region defined by a substrate 10, scan lines S, data lines D, and pixel power lines VDD formed on the substrate 10. An image display unit 20 having a plurality of pixels 21, a scan driver 30, a data driver 40, a first power supply line 50, a second pixel power supply line 52, and a pad unit 60 are provided. do.

The scan driver 30 is disposed adjacent to one side of the image display unit 20 and electrically connected to the first pads Ps of the pad unit 60 through the scan control signal line 32. The scan driver 30 generates a scan signal according to the scan control signal line 32 and sequentially supplies the scan signal to the scan lines S of the image display unit 20.

The data driver 40 is electrically connected to the data line D, and is electrically connected to the second pad Pd of the pad part 60. In this case, the data driver 40 may be manufactured in a chip form and mounted on the substrate 10.

The second pixel power supply line 52 is formed on the entire surface of the image display unit 20. The second pixel power line 52 commonly supplies the second power supplied from the fifth pad Pvss of the pad unit 60 to each pixel 121.

The first power supply line 50 is formed adjacent to the upper side of the image display unit 20 and commonly connected to one side of the first pixel power supply line VDD. The first power line 50 receives the first power transmitted from the fourth pad Pvdd of the pad unit 60 through the first power supply line 48 to the first pixel power line of each pixel 21. VDD).

One side of each first pixel power line VDD is commonly connected to the first power line 50. Each of the first pixel power lines VDD supplies the first power supplied from the first power line 50 to each pixel 21.

Accordingly, each pixel 21 is controlled by the scan signal supplied to the scan line S and is applied to the current supplied from the first pixel power supply line VDD to the light emitting element according to the data signal supplied to the data line D. The light is emitted to display an image.

Such a general light emitting display device includes a first power supply supplied to each pixel 21 due to non-uniformity of line resistance according to the length of each first pixel power supply line VDD commonly connected to the first power supply line 50. The magnitude of the IR drop is different. That is, the magnitude of the voltage drop of the first pixel power line VDD is smaller as it is adjacent to the first power line 50, while the voltage of the first pixel power line VDD is farther from the first power line 50. The magnitude of the descent increases. Accordingly, in the general light emitting display device, due to the nonuniformity of the voltage drop of the first pixel power supply line VDD according to the position of the pixel 21, the amount of current varies for each position of the pixel 21 with respect to the same data signal. There is a problem of non-uniformity.

Accordingly, it is an object of the present invention to provide a light emitting display device capable of making the light emission luminance uniform by making the voltage drop of the power supply line uniform.

As a technical means for achieving the above object, a first aspect of the present invention is an image display unit including a plurality of pixels defined by a plurality of scanning lines and a plurality of data lines, and driving to each pixel from one side of the image display unit A first power supply line for supplying a voltage, a second power supply line for supplying the driving voltage to each pixel on the other side of the image display unit, and a third power supply line for supplying the driving voltage to one side of the first and second power supply lines; A fourth power line for supplying the driving voltage to the other side of the first and second power lines, and a plurality of first power connection lines for electrically connecting one side of each of the third and fourth power lines to the first power line; The present invention provides a light emitting display device including a plurality of second power connection lines for electrically connecting the other side of each of the third and fourth power lines to the second power line.

According to a second aspect of the present invention, an image display unit includes a plurality of pixels which emit light by receiving a current corresponding to a data signal supplied to a data line from a pixel power supply line according to a scan signal supplied to a scan line, and one side of the pixel power supply line A first power supply line for supplying a driving voltage to the second power supply line; a second power supply line for supplying the driving voltage to the other side of the pixel power supply line; a third power supply line for supplying the driving voltage to one side of the first and second power supply lines; A fourth power line for supplying the driving voltage to the other side of the first and second power lines, a plurality of power connection lines divided into a plurality from the third and fourth power lines, and electrically connected to the first power line; The driving voltage divided into a plurality of third and fourth power lines and electrically connected to the second power line and supplied from the third and fourth power lines; By varying the level and provides a light emitting display device having a plurality of power backup line for supplying the second power supply line.

Hereinafter, with reference to the accompanying drawings 2 to 6 the most preferred embodiment that can be easily carried out by those of ordinary skill in the art as follows.

2 is a diagram illustrating a light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a light emitting display device according to an exemplary embodiment of the present invention is positioned on a substrate 110 and defined by data lines D, scan lines S, and a plurality of first pixel power lines VDD. An image display unit 120 including a plurality of pixels 121, first to fourth power lines 150, 152, 154, and 156, a plurality of first and second power connection lines 1531, 1532, 1533, 1534 and a plurality of first and second power compensation lines 1551, 1552, 1553, and 1554.

In addition, the light emitting display device according to the first exemplary embodiment may further include a scan driver 130, a data driver 140, a second pixel power line 170, and a pad unit 160.

The scan driver 130 is disposed to be adjacent to one side of the image display unit 120 and electrically connected to the first pad Ps of the pad unit 160. The scan driver 130 generates a scan signal according to the scan control signal lines from the first pads Ps and sequentially supplies the scan signals to the scan lines S of the image display unit 120.

The data driver 140 is electrically connected to the data line D, and is electrically connected to the second pads Pd of the pad unit 160. In this case, the data driver 140 may be directly formed on the substrate 110 or manufactured in a chip shape and mounted on the substrate 110. Here, the chip-shaped data driver 140 may be mounted on the substrate 110 by a chip on glass method, a wire bonding method, a flip chip method, a beam lead method, or the like. The data driver 140 receives the data control signal and the data signal from the second pads Pd and supplies the data signal to the data lines D according to the data control signal.

The first power line 150 is formed side by side adjacent to the upper surface of the image display unit 120. The first power supply line 150 is electrically connected to one end (upper side) end of each first pixel power supply line VDD. The first power line 150 may include first power supplied from the third and fourth power lines 154 and 156 through the plurality of first and second power connection lines 1531, 1532, 1533, and 1534. It is supplied to one side of the first pixel power supply line VDD.

The second power lines 152 are formed side by side so as to be adjacent to the lower side of the image display unit 120. The second power supply line 152 is electrically connected to the other end (lower end) of each first pixel power supply line VDD. The second power line 152 receives the first power supplied from the third and fourth power lines 154 and 156 through the plurality of first and second power compensation lines 1551, 1552, 1553, and 1554. Supply to the other side of each first pixel power supply line VDD.

The third power line 154 is formed side by side so as to be adjacent to the first side surface (right side surface) of the image display unit 120. The end of the third power line 154 is electrically connected to the third pad Pvdd of the pad portion 160. The third power line 154 receives the first power from the third pad Pvdd and supplies the first power line 150 to the first power line 150 through the plurality of first power connection lines 1531 and 1532. The first power supply line is supplied to the second power supply line 152 through the power supply compensation lines 1551 and 1552.

The fourth power supply line 156 is formed side by side so as to be adjacent to the second side surface (left side surface) of the image display unit 120. The end of the fourth power supply line 156 is electrically connected to the third pad Pvdd of the pad portion 160. The fourth power line 156 receives the first power from the third pad Pvdd and supplies the first power line 150 to the first power line 150 through the plurality of second power connection lines 1553 and 1554. 2 is supplied to the second power supply line 152 through the power supply compensation lines 1553 and 1554.

The plurality of first power connection lines 1531 and 1532 are electrically connected to one end of the third power line 154 perpendicular to the right line with respect to the center of the first power line 150. Specifically, one end of the plurality of first power connection lines 1531 and 1532 is divided into a plurality of parts and electrically connected to an upper end of the third power line 154, and the other side is electrically connected to the first power line 150. do. In this case, the other sides of the plurality of first power connection lines 1531 and 1532 are electrically connected to be perpendicular to each center of the bisecting region between the longitudinal center of the first power line 150 and one end. That is, the other side of the plurality of first power connection lines 1531 and 1532 is electrically connected to a point where the current path is the same on the second bisection between the longitudinal center of the first power line 150 and one end. Accordingly, the current paths from the other sides of the plurality of first power connection lines 1531 and 1532 and the electrical first and second connection points of the first power line 150 are the same on the first power line 150. The plurality of first power connection lines 1531 and 1532 supply the first power supplied from the third power line 154 on the right line of the first power line 150.

The plurality of second power connection lines 1533 and 1534 are electrically connected to one end of the fourth power line 156 at a point perpendicular to the left line with respect to the center of the first power line 150. Specifically, one end of the plurality of second power connection lines 1533 and 1534 is divided into a plurality of parts and electrically connected to the upper end of the fourth power line 156, and the other side is electrically connected to the first power line 150. do. In this case, the other sides of the plurality of second power supply lines 1533 and 1534 are electrically connected to be perpendicular to each center of the bisecting region between the longitudinal center of the first power line 150 and the other end. That is, the other side of the plurality of second power connection lines 1533 and 1534 are electrically connected to the same current path on the two-division region between the longitudinal center of the first power line 150 and the other end. Accordingly, the current paths from the other side of the plurality of second power connection lines 1533 and 1534 and the electrical third and fourth connection points of the first power line 150 are the same on the first power line 150. The plurality of second power connection lines 1533 and 1534 supply the first power supplied from the fourth power line 156 on the left line of the first power line 150.

The plurality of first power supply compensation lines 1551 and 1552 are electrically connected to the other side of the third power supply line 154 perpendicular to the right line with respect to the center of the second power supply line 152. Specifically, one end of the plurality of first power supply compensation lines 1551 and 1552 is divided into a plurality of parts and electrically connected to the other end of the third power supply line 154, and the other side is electrically connected to the second power supply line 152. do. In this case, the other sides of the plurality of first power supply compensation lines 1551 and 1552 are electrically connected to be perpendicular to each center of the bisecting region between the longitudinal center of the second power supply line 152 and one end. That is, the other side of the plurality of first power supply compensation lines 1551 and 1552 is electrically connected to a point where the current path on the two equal region between the longitudinal center of the second power supply line 152 and one end thereof is the same. Accordingly, the current paths from the other sides of the plurality of first power supply compensation lines 1551 and 1552 and the electrical first and second connection points of the second power supply line 152 are the same on the second power supply line 152. . The plurality of first power compensation lines 1551 and 1552 supply the first power supplied from the third power line 154 on the right line of the second power line 152.

Meanwhile, the line widths and lengths of the plurality of first power compensation lines 1551 and 1552 are first supplied to the first and second connection points of the first power line 150 from the plurality of first power connection lines 1531 and 1532. The power source and the first power source supplied to the first and second connection points of the second power line 152 through the same are set to be the same. Here, the line widths of the plurality of first power supply compensation lines 1551 and 1552 may be formed to have a width smaller than that of the third power supply line 154. Accordingly, the plurality of first power supply compensation lines 1551 and 1552 drop the first power supply from the third power supply line 154 so as to be on the right side of the second power supply line 152, that is, the first and second connection points. Will be supplied to

The plurality of second power supply compensation lines 1553 and 1554 are electrically connected to the other side of the fourth power supply line 156 perpendicular to the left line with respect to the center of the second power supply line 152. Specifically, one end of the plurality of second power supply compensation lines 1553 and 1554 is electrically connected to the other side of the fourth power supply line 156, and the other side is electrically connected to the second power supply line 152. In this case, the other side of the plurality of second power supply compensation lines 1553 and 1554 may be divided into a plurality of parts and electrically connected to the centers of the second equal region between the longitudinal center of the second power supply line 152 and the other end thereof. . That is, the other side of the plurality of second power supply compensation lines 1553 and 1554 is electrically connected to a point where the current path on the second equal region between the longitudinal center of the second power supply line 152 and the other end thereof is the same. Accordingly, the current paths from the other sides of the plurality of second power supply compensation lines 1553 and 1554 and the electrical third and fourth connection points of the second power supply line 152 are the same on the second power supply line 152. The plurality of second power compensation lines 1553 and 1554 supply the first power supplied from the fourth power line 154 on the left line of the second power line 152.

Meanwhile, the line widths and lengths of the plurality of second power supply compensation lines 1553 and 1554 may be provided to the third and fourth connection points of the first power supply line 150 from the plurality of second power supply connection lines 1533 and 1534. The power source and the first power source supplied to the third and fourth connection points of the second power line 152 through the self are set to be the same. Here, the line widths of the plurality of second power supply compensation lines 1553 and 1554 may be formed to have a width smaller than that of the fourth power supply line 156. Accordingly, the plurality of second power supply compensation lines 1553 and 1554 may drop the first power supply from the fourth power supply line 156 so that the second power supply compensation lines 1553 and 1554 are on the left line of the second power supply line 152, that is, the third and fourth connection points. Will be supplied to

The second pixel power supply line 170 is formed on the entire surface of the image display unit 120. The second pixel power line 170 supplies the second power 121, which is transmitted from the fifth pad Pvss of the pad unit 160, to each pixel 121. In this case, the second pixel power line 170 may be separated and formed to be parallel to the scan line S of the image display unit 120.

One side of each first pixel power line VDD is electrically connected to the first power line 150, and the other side is electrically connected to the second power line 152. Each of the first pixel power lines VDD supplies the first power supplied from the first and second power lines 150 and 152 to each pixel 121. In this case, the first power supplied to one side and the other side of each of the first pixel power lines VDD may include a plurality of first and second power connection lines 1531, 1532, 1533, and 1534 and a plurality of first and second power compensations. The same is made by lines 1551, 1552, 1553, and 1554.

Accordingly, each pixel 121 is controlled by the scan signal supplied to the scan line S and is applied to the current supplied from the first pixel power line VDD to the light emitting device according to the data signal supplied to the data line D. The light is emitted to display an image. In this case, each pixel 121 outputs a current corresponding to the data signal supplied to the data line D from the first pixel power line VDD according to the scan signal supplied from the at least one scan line S. FIG. It will include. The pixel circuit may include at least one transistor and may further include at least one capacitor.

3 is a diagram illustrating a light emitting display device according to a second embodiment of the present invention.

Referring to FIG. 3, the light emitting display device according to the second embodiment of the present invention includes a plurality of first and second power connection lines 1531, 1532, 1533, and 1534, and first and second power compensation lines 1551, Except for 1552, 1553, and 1554, the same as the first embodiment of the present invention shown in FIG. Accordingly, the second embodiment of the present invention excludes the plurality of first and second power connection lines 1153, 1532, 1533, and 1534 and the first and second power compensation lines 1551, 1552, 1553, and 1554. The description of other components will be replaced with the description of the first embodiment of the present invention described above.

The plurality of first power connection lines 1531 and 1532 are electrically connected to one end of the third power line 154 perpendicular to the right line with respect to the center of the first power line 150. Specifically, one end of the plurality of first power connection lines 1531 and 1532 is divided into a plurality of parts and electrically connected to an upper end of the third power line 154, and the other side is electrically connected to the first power line 150. do. In this case, the other sides of the plurality of first power connection lines 1531 and 1532 are electrically connected to be perpendicular to each center of the bisecting region between the longitudinal center of the first power line 150 and one end. That is, the other side of the plurality of first power connection lines 1531 and 1532 is electrically connected to a point where the current path is the same on the second bisection between the longitudinal center of the first power line 150 and one end. Accordingly, the current paths from the other sides of the plurality of first power connection lines 1531 and 1532 and the electrical first and second connection points of the first power line 150 are the same on the first power line 150.

Meanwhile, the plurality of first power connection lines 1531 and 1532 are formed to have the same length as each other. To this end, any one of the plurality of first power connection lines 1531 and 1532 may be bent in an S shape. The plurality of first power connection lines 1531 and 1532 supply the first power supplied from the third power line 154 on the right line of the first power line 150.

The plurality of second power connection lines 1533 and 1534 are electrically connected to one end of the fourth power line 156 at a point perpendicular to the left line with respect to the center of the first power line 150. Specifically, one end of the plurality of second power connection lines 1533 and 1534 is divided into a plurality of parts and electrically connected to the upper end of the fourth power line 156, and the other side is electrically connected to the first power line 150. do. In this case, the other sides of the plurality of second power supply lines 1533 and 1534 are electrically connected to be perpendicular to each center of the bisecting region between the longitudinal center of the first power line 150 and the other end. That is, the other side of the plurality of second power connection lines 1533 and 1534 are electrically connected to the same current path on the two-division region between the longitudinal center of the first power line 150 and the other end. Accordingly, the current paths from the other side of the plurality of second power connection lines 1533 and 1534 and the electrical third and fourth connection points of the first power line 150 are the same on the first power line 150.

Meanwhile, the plurality of second power connection lines 1533 and 1534 are formed to have the same length. To this end, any one of the plurality of second power connection lines 1533 and 1534 1533 is formed to be bent in an S shape. The plurality of second power connection lines 1533 and 1534 supply the first power supplied from the fourth power line 156 on the left line of the first power line 150.

The plurality of first power supply compensation lines 1551 and 1552 are electrically connected to the other side of the third power supply line 154 perpendicular to the right line with respect to the center of the second power supply line 152. Specifically, one end of the plurality of first power supply compensation lines 1551 and 1552 is divided into a plurality of parts and electrically connected to the other end of the third power supply line 154, and the other side is electrically connected to the second power supply line 152. do. In this case, the other sides of the plurality of first power supply compensation lines 1551 and 1552 are electrically connected to be perpendicular to each center of the bisecting region between the longitudinal center of the second power supply line 152 and one end. That is, the other side of the plurality of first power supply compensation lines 1551 and 1552 is electrically connected to a point where the current path on the two equal region between the longitudinal center of the second power supply line 152 and one end thereof is the same. Accordingly, the current paths from the other sides of the plurality of first power supply compensation lines 1551 and 1552 and the electrical first and second connection points of the second power supply line 152 are the same on the second power supply line 152. . The plurality of first power compensation lines 1551 and 1552 supply the first power supplied from the third power line 154 on the right line of the second power line 152.

Meanwhile, the plurality of first power compensation lines 1551 and 1552 are bent in an S shape to have the same length. In addition, the line widths and lengths of the plurality of first power compensation lines 1551 and 1552 may be the first and second connection points supplied to the first and second connection points of the first power supply line 150 from the plurality of first power supply connection lines 1531 and 1532. The power source and the first power source supplied to the first and second connection points of the second power line 152 through the same are set to be the same. Here, the line widths of the plurality of first power supply compensation lines 1551 and 1552 may be formed to have a width smaller than that of the third power supply line 154. Accordingly, the plurality of first power supply compensation lines 1551 and 1552 drop the first power supply from the third power supply line 154 so as to be on the right side of the second power supply line 152, that is, the first and second connection points. Will be supplied to

The plurality of second power supply compensation lines 1553 and 1554 are electrically connected to the other side of the fourth power supply line 156 perpendicular to the left line with respect to the center of the second power supply line 152. Specifically, one end of the plurality of second power supply compensation lines 1553 and 1554 is electrically connected to the other side of the fourth power supply line 156, and the other side is electrically connected to the second power supply line 152. At this time, the other side of the plurality of second power supply compensation lines 1553 and 1554 is divided into a plurality and electrically connected to the centers of the second equal region between the longitudinal center and the other end of the second power supply line 152. . That is, the other side of the plurality of second power supply compensation lines 1553 and 1554 is electrically connected to a point where the current path on the second equal region between the longitudinal center of the second power supply line 152 and the other end thereof is the same. Accordingly, the current paths from the other sides of the plurality of second power supply compensation lines 1553 and 1554 and the electrical third and fourth connection points of the second power supply line 152 are the same on the second power supply line 152. The plurality of second power compensation lines 1553 and 1554 supply the first power supplied from the fourth power line 154 on the left line of the second power line 152.

On the other hand, the plurality of second power supply compensation lines 1553 and 1554 are bent in an S shape to have the same length as each other. In addition, the line widths and lengths of the plurality of second power supply compensation lines 1553 and 1554 may be provided to the third and fourth connection points of the first power supply line 150 from the plurality of second power supply connection lines 1533 and 1534. The power source and the first power source supplied to the third and fourth connection points of the second power line 152 through the self are set to be the same. Here, the line widths of the plurality of second power supply compensation lines 1553 and 1554 may be formed to have a width smaller than that of the fourth power supply line 156. Accordingly, the plurality of second power supply compensation lines 1553 and 1554 may drop the first power supply from the fourth power supply line 156 so that the second power supply compensation lines 1553 and 1554 are on the left line of the second power supply line 152, that is, the third and fourth connection points. Will be supplied to

4 is a diagram illustrating a current distribution supplied to the image display unit 120 illustrated in FIG. 3.

Referring to FIG. 4 and FIG. 3, the light emitting display according to the second exemplary embodiment of the present invention includes a plurality of first and second power connection lines 1531, 1532, 1533, and 1534 and a plurality of first and second power compensations. By using the lines 1551, 1552, 1553, and 1554 to make the same first power supplied to the first and second power lines 150 and 152, the nonuniformity of the current supplied to the image display unit 120 is improved as a whole. You can see it. That is, as shown in FIG. 3, the current distribution is somewhat uneven due to the voltage drop in the third and fourth power lines 154 and 156 adjacent to the image display unit 120 and the voltage drop of the first pixel power line VDD. It is understood that the current distribution flowing through the image display unit 120 as a whole becomes uniform in left, right, and up and down symmetry.

On the other hand, the current distribution supplied to the image display unit 120 of the light emitting display according to the first embodiment of the present invention is the same as shown in FIG.

FIG. 5 is a diagram showing the amount of current supplied to each pixel 121 connected to the first to n scan lines shown in FIGS. 2 and 3.

2 to 4, it can be seen that the current supplied to each pixel 121 connected to the first to n scan lines is symmetrically supplied. That is, the current flowing through the image display unit 120 is the first power supplied to one side and the other side of the first pixel power line VDD by the plurality of first and second power compensation lines 1551, 1552, 1553, and 1554. Since this is the same, the upper region of the image display portion 120 corresponding to the position of the first scan line and the lower region of the image display portion 120 corresponding to the nth scan line are made uniform.

As described above, the light emitting display device according to the first and second embodiments of the present invention uses the plurality of first and second power compensation lines 1551, 1552, 1553, and 1554 to display the first and second power lines 150. By equalizing the voltage drop of the first power source supplied to the second power source 152, the current supplied to each pixel 121 from the first pixel power line VDD can be made uniform. Accordingly, in the light emitting display devices according to the first and second embodiments of the present invention, a uniform current flows through the entire image display unit 120 to improve the nonuniformity of the image quality, thereby obtaining uniform image quality.

On the other hand, in the light emitting display device according to the first and second embodiments of the present invention, a plurality of first and second electrodes for electrically connecting one side of the third and fourth power lines 154 and 156 to the first power line 150 are provided. The second power connection lines 1153, 1532, 1533, and 1534 may be more than two, as shown in FIGS. 2 and 3. In the light emitting display device according to the first and second exemplary embodiments of the present invention, the first and second power lines 154 and 156 electrically connect the other side of the third and fourth power lines 154 and 156 to the second power line 152. The second power compensation lines 1551, 1552, 1553, and 1554 are not limited to two as shown in FIGS. 2 and 3, but may be more than that.

6 is a diagram illustrating a light emitting display device according to a third embodiment of the present invention.

Referring to FIG. 6, the light emitting display device according to the third exemplary embodiment of the present invention has the above-described present invention except for the data driver 140 for supplying a data signal to the data line D of the image display unit 120. Are the same as the light emitting display devices according to the first and second embodiments of the present invention.

The data driver 140 of the light emitting display device according to the third embodiment of the present invention is mounted on a flexible printed circuit 180 connected to the substrate 110. Accordingly, the data driver 140 is electrically connected to the data line D of the image display unit 120 through the pad portion of the substrate 110 to supply a data signal. In this case, the data driver 140 may include a chip on board mounted on a printed circuit board in addition to the flexible printed circuit 180 and a chip on film mounted directly on a film. Alternatively, the present invention may be mounted on a conventional film type connecting element employed in a tape carrier package.

The above detailed description and drawings are merely exemplary of the present invention, which are used only for the purpose of illustrating the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Accordingly, those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical protection scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

As described above, the light emitting display device according to the exemplary embodiment of the present invention can make the current supplied to each pixel uniform by making the pixel driving voltages supplied to both ends of the pixel power line the same. Accordingly, in the present invention, a uniform current flows through the entire image display unit, thereby improving the nonuniformity of the image quality, thereby obtaining uniform image quality.

Claims (17)

An image display unit including a plurality of pixels defined by a plurality of scanning lines and a plurality of data lines, A first power supply line supplying a driving voltage to each pixel from one side of the image display unit; A second power supply line supplying the driving voltage to each pixel on the other side of the image display unit; A third power supply line supplying the driving voltage to one side of the first and second power supply lines; A fourth power supply line supplying the driving voltage to the other side of the first and second power supply lines; A plurality of first power connection lines for electrically connecting one side of each of the third and fourth power lines to the first power line; And a plurality of second power connection lines for electrically connecting the other side of each of the third and fourth power lines to the second power line. The method of claim 1, The plurality of first power connection lines, A plurality of first connection lines divided into a plurality from one side of the third power line and electrically connected to a plurality of first connection points having the same length of current path with respect to a length direction of the first power line; And a plurality of second connection lines which are divided into a plurality from one side of the fourth power line and electrically connected to a plurality of second connection points having the same length of current path with respect to the length direction of the first power line. The method of claim 2, The plurality of first connection points are located between one side and the center of the first power line, The plurality of second connection points are positioned between the other side and the center of the first power line. The method of claim 2, Any one of the plurality of first connection lines is formed to be bent in an S shape, Any one of the plurality of second connection lines is formed to be bent in an S shape. The method of claim 1, The plurality of second power connection lines, A plurality of third connection lines which are divided into a plurality from the other side of the third power line and electrically connected to a plurality of third connection points having the same length of the current path with respect to the length direction of the second power line; And a plurality of fourth connection lines which are divided into a plurality from the other side of the fourth power line and electrically connected to a plurality of fourth connection points having the same length of the current path with respect to the length direction of the second power line. The method of claim 5, wherein The plurality of third connection points are located between one side and the center of the second power line, The plurality of fourth connection points are positioned between the other side and the center of the second power line. The method of claim 5, wherein The plurality of first and second power compensation lines are curved in an S shape. The method of claim 1, The plurality of second power connection lines have a line resistance different from the plurality of first power connection lines. The method of claim 1, And the driving voltage supplied to the first power line is the same as the driving voltage supplied to the second power line. The method of claim 1, Each of the plurality of second power connection lines is configured to drop the driving voltage from the other side of the third and fourth power lines so as to be equal to the driving voltage supplied to the first power line, and emit light to supply the second power line. Display. An image display unit including a plurality of pixels which emit light by receiving a current corresponding to the data signal supplied to the data line from the pixel power supply line according to the scan signal supplied to the scan line; A first power supply line supplying a driving voltage to one side of the pixel power supply line; A second power supply line supplying the driving voltage to the other side of the pixel power supply line; A third power supply line supplying the driving voltage to one side of the first and second power supply lines; A fourth power supply line supplying the driving voltage to the other side of the first and second power supply lines; A plurality of power connection lines divided into a plurality from said third and fourth power lines and electrically connected to said first power lines; A plurality of parts divided from the third and fourth power lines and electrically connected to the second power lines to change the level of the driving voltage supplied from the third and fourth power lines to supply the second power lines. A light emitting display device comprising a plurality of power compensation lines. The method of claim 11, The plurality of power connection lines, A plurality of first power connection lines having one side connected in common to one side of the third power line and the other side electrically connected to a plurality of first connection points having the same length of current path with respect to the longitudinal direction of the first power line; A light emission having a plurality of second power connection lines, one side of which is commonly connected to one side of the fourth power line and the other side of which is electrically connected to a plurality of second connection points having the same length of current path in the longitudinal direction of the first power line Display. The method of claim 12, The plurality of first connection points are located between one side and the center of the first power line, The plurality of second connection points are positioned between the other side and the center of the first power line. The method of claim 12, Any one of the plurality of first power connection lines is formed to be bent in an S shape, Any one of the plurality of second power connection lines is bent in an S shape. The method of claim 11, The plurality of power compensation lines, A plurality of first power compensation lines having one side connected in common to the other side of the third power line and the other side electrically connected to a plurality of third connection points having the same length of current path with respect to the length direction of the second power line; A plurality of second power supply compensation lines having one side connected in common to the other side of the fourth power line and the other side electrically connected to the plurality of fourth connection points having the same length of current path with respect to the length direction of the second power line; Light emitting display. The method of claim 15, The plurality of third connection points are located between one side and the center of the second power line, The plurality of fourth connection points are positioned between the other side and the center of the second power line. The method of claim 15, The plurality of first and second power compensation lines are curved in an S shape.

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