KR100636506B1 - Light emitting display - Google Patents

Abstract

The present invention relates to a flat panel display device capable of making the line resistance of a power supply line uniform.

A light emitting display device according to the present invention includes an image display unit including a substrate, a plurality of pixels formed to be adjacent to an intersection area of the data lines and the scan lines of the substrate, and a first pixel drive to each pixel on one side of the image display unit. An electrical connection between a first power supply line for supplying a voltage, an auxiliary power supply line for supplying the first pixel drive voltage to each pixel on the other side of the image display unit, and the first power supply line and an auxiliary power supply line; And an impedance compensating means for compensating for the difference in voltage drop between the first power line and the auxiliary power line.

According to this configuration, the present invention uses the impedance compensation means to reduce the voltage drop caused by the line resistance along the length of the auxiliary power supply line for supplying the first pixel driving voltage from the lower side of the image display unit to the first pixel driving voltage from the upper side of the image display unit. The voltage drop of the pixel driving voltage supplied to each pixel can be minimized by making the voltage drop of the first power supply line to supply the same. Therefore, the present invention can minimize the unevenness of luminance due to the difference in voltage drop along the length of the power supply line supplying the pixel driving voltage to each pixel.

Description

Light emitting display device {LIGHT EMITTING DISPLAY}             

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

2 is a diagram showing an amount of current supplied to each pixel due to a voltage drop in a power supply line;

3 illustrates a light emitting display device according to an exemplary embodiment of the present invention.

4 is a diagram showing an amount of current supplied to each pixel due to a voltage drop in a power supply line;

5 is a diagram illustrating a light emitting display device according to another embodiment of the present invention;

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

10, 110: substrate 12, 112: image display unit

20, 120: scan driving circuit 30, 130: data driving circuit

40, 140: first power line 42, 142: second power line

44, 144: auxiliary power line 50, 150: pad portion

60, 160: FPC 62, 162: pixel drive voltage supply line

70, 170: controller 72, 172: control unit

74, 174: power generator 164: impedance compensation means

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. The light emitting display device is classified into an inorganic light emitting display device and an organic light emitting display device according to materials and structures. In addition, the light emitting display device is classified into a passive light emitting display device and an active light emitting display device according to a driving method. This 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.

Referring to FIG. 1, a conventional light emitting display device emits a light emitting device and a light emitting device that are disposed to be adjacent to a cross region of a substrate 10, data lines D, and scan lines S formed on the substrate 10. An image display unit 12 having a plurality of pixels 11 including a pixel circuit for making a first power supply line, and a first power supply line for supplying a first pixel driving voltage to the image display unit 12 from one side of the image display unit 12. 40, an auxiliary power supply line 44 for supplying the first pixel driving voltage to the image display unit 12 from the other side of the image display unit 12, a first power supply line 40, and an auxiliary power supply line 44. A plurality of pixel power supply lines VDD electrically connected to the plurality of pixel power lines VDD for supplying the first pixel driving voltage to each pixel 11, and a second pixel driving voltage to the plurality of pixels 11 on one side of the image display unit 12. And a second power supply line 42 for supplying power.

In addition, the conventional light emitting display device includes a scan driving circuit 20 for supplying a selection signal to the scan lines S, a data driver circuit 30 for supplying a data signal to the data lines D, and externally. A pad unit 50 to which data signals, voltages, scan and data control signals are supplied, a controller 70 for supplying data signals, scan and data control signals to the pad unit 50, and a controller 70 A flexible printed circuit (FPC) 50 is further provided for connecting to the pad portion 50.

The controller 70 includes a controller 72 and a power generator 74 that generates voltages. The controller 72 generates scan control signals for controlling the driving timing of the scan driving circuit 20, and generates data control signals for controlling the driving timing of the data driving circuit 30. In addition, the controller 72 supplies a data signal from the outside to the data driver circuit 30. The control unit 72 then controls the power generation unit 74.

The power generator 74 generates the first and second pixel driving voltages and the power VCC required to drive the data driving circuit 30 and the scan driving circuit 20 under the control of the controller 72. In this case, the second pixel driving voltage may have a voltage level lower than that of the first pixel driving voltage, and may be, for example, a ground level.

The FPC 60 is electrically connected to the pad portion of the controller 70 by an anisotropic conductive film (not shown) and electrically connected to the pad portion 50 of the substrate 10. On the FPC 60, signal lines for transmitting the data signal, the data control signal, and the scan control signal supplied from the control unit 72 to the pad unit 50 of the substrate 10 are formed. In addition, a first pixel driving voltage supply line 62 is formed on the PFC 60 to transfer the first pixel driving voltage supplied from the power generating unit 74 to the pad unit 50 of the substrate 10. Then, on the FPC 60, the power supply VCC and the second pixel driving voltage required for driving the data driving circuit 30 and the scan driving circuit 20 from the power generating unit 74 are supplied to the pad portion of the substrate 10. Voltage lines for supplying 50) are formed.

The pad unit 50 is connected to both ends of the first power line 40 through the first signal lines 44a and 44b and through the second signal lines 37a and 37b. Second pads Pvdd2 electrically connected to both ends of the auxiliary power line 44, and third pads Pvss electrically connected to the second power line 42 through the third signal line 46. And fourth pads Ps electrically connected to the scan driving circuit 20 through the scan signal line 35, and second materials electrically connected to the data driving circuit 30 through the first data signal line 32. 5 pads Pd.

The first and second pads Pvdd1 and Pvdd2 are electrically connected to the first pixel driving voltage supply line 62 formed in the FPC 60. Accordingly, the first pixel driving voltage is supplied to the first and second pads Pvdd1 and Pvdd2 from the power generator 74 via the FPC 60. The second pad driving voltage is supplied to the third pads Pvss from the power generator 74 via the FPC 60. The fourth pads Ps are supplied with the scanning control signal from the controller 72 via the FPC 60, and the fifth pads Pd are supplied with the data control signal from the controller 72 via the FPC 60. And a data signal is supplied.

The first power line 40 is formed along the edge of the substrate 10 except for the pad portion 50. The first power line 40 supplies the first pixel driving voltage transmitted from the first pads Pvdd1 of the pad unit 50 to the plurality of pixel power lines VDD.

The auxiliary power line 44 is formed to be adjacent to the other side of the image display unit 12. The auxiliary power line 44 supplies the first pixel driving voltage transmitted from the second pads Pvdd2 of the pad unit 50 to the plurality of pixel power lines VDD.

One side of each of the plurality of pixel power lines VDD is commonly connected to the first power line 40 adjacent to the upper side of the image display unit 12, and the other side thereof is the auxiliary power line 44 adjacent to the lower side of the image display unit 12. ) Are commonly connected. The plurality of pixel power lines VDD supplies the first pixel driving voltages supplied from the first and auxiliary power lines 40 and 44 to each pixel 11.

The second power supply line 42 is formed between the right side of the image display unit 12 and the first power supply line 40, and is electrically connected to the cathode electrode of the light emitting element formed on the front surface of the image display unit 12. The second power supply line 42 supplies a second pixel driving voltage transmitted from the third pads Pvss of the pad unit 50 to the cathode electrode of the light emitting device.

The data driving circuit 30 is disposed to be adjacent to the pad unit 50, and is electrically connected to the fifth pads Pd through the first data signal line 32 and the data through the second data signal line 34. It is electrically connected to the line D. In this case, the data driving circuit 30 may be mounted on the substrate 10 by a chip on glass method, a wire bonding method, a flip chip method, a beam lead method, or the like, and may be directly formed on the substrate 10. have. The data driving circuit 30 receives a data control signal and a data signal supplied from the fifth pads Pd and outputs a data signal of one horizontal line every one horizontal period according to the data control signal. To feed.

The scan driving circuit 20 is formed between one side of the image display unit 12 and the first power supply line 40 and is electrically connected to the fourth pads Ps via the scan signal line 35. The scan driving circuit 20 generates a sequential selection signal according to the scan control signal supplied from the fourth pads Ps via the scan signal line 35 to the scan lines S of the image display unit 12. Supply. To this end, the scan driving circuit 20 is composed of a plurality of shift registers for generating a sequential selection signal in response to the scan control signal.

The pixel circuit of each pixel 11 is formed to be adjacent to the intersection of the data line D, the scan line S, and the pixel power supply line VDD. The pixel circuit is controlled by the selection signal supplied to the scan line S, and controls the amount of current supplied from the first pixel power supply line VDD to the light emitting device according to the data signal supplied to the data line D. Accordingly, the light emitting element of each pixel 11 emits light by the current supplied from the pixel circuit to display an image.

In the conventional light emitting display device, the magnitude of the voltage drop IR drop is different due to an increase in the line resistance according to the distance between the first power line 40 and the auxiliary power line 44. Accordingly, as shown in FIG. 2, the upper region A of the image display unit 12, to which the first pixel driving voltage is supplied from the first power supply line 40, becomes a low voltage region, and from the auxiliary power supply line 44. The lower region B of the image display portion 12 to which the first pixel drive voltage is supplied becomes a high voltage region. Therefore, in the conventional light emitting display device, each pixel (not shown) is caused by the voltage drop according to the position of the pixel 11 with respect to the same data signal due to the difference in voltage drop between the first power line 40 and the auxiliary power line 44. 11) there is a problem in that the luminous luminance is uneven due to the amount of current supplied to the second.

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.

In order to achieve the above object, a light emitting display device according to an embodiment of the present invention, an image display unit including a substrate, a plurality of pixels formed to be adjacent to the intersection of the data line and the scan line of the substrate, and one of the image display unit A first power supply line for supplying a first pixel driving voltage to each pixel at a side surface, an auxiliary power supply line for supplying the first pixel driving voltage to each pixel at another side of the image display unit, and the first power supply line And an impedance compensation means electrically connected between the line and the auxiliary power line to compensate for the difference in voltage drop between the first power line and the auxiliary power line.

In the light emitting display device, one side is electrically connected to the first power line and the other side is electrically connected to the auxiliary power line, and the first pixel driving voltage from the first power line and the auxiliary power line is applied to each pixel. A plurality of pixel power lines to supply to the second substrate; a second power line formed on the substrate to supply a second pixel driving voltage to the pixels; and a first pad formed on the substrate and connected to the first power line. And pads including second pads connected to the auxiliary power line, and third pads connected to the second power line, a scan driving circuit for supplying a selection signal to the scan lines, and the data lines. A data driving circuit for supplying a data signal is further provided.

The light emitting display device includes a power generation unit for generating the first and second pixel driving voltages, and a signal transfer unit for transferring the first pixel driving voltage from the power generation unit to the first and second pads. It is further provided.

In the light emitting display device, the signal transmitting means includes a pixel driving voltage supply line for supplying the first pixel driving voltage to the first and second pads from the power generator.

In the light emitting display device, the impedance compensating means is a resistor electrically connected between the pixel driving voltage supply line and the second pad.

In the light emitting display device, the first power line is formed along an edge of the substrate except for the pad part to be electrically connected to the first pads, and the auxiliary power line is disposed between the pad part and the lower side of the image display part. And are electrically connected to the second pads.

In the light emitting display device, the impedance compensating means compensates for the voltage drop caused by the line resistance of the auxiliary power line to be equal to the voltage drop caused by the line resistance of the first power line.

In the light emitting display device, the data driving circuit is disposed between the pad unit and the auxiliary power line and one of the signal transmitting means.

A light emitting display device according to an embodiment of the present invention includes an image display unit including a substrate, a plurality of pixels formed to be adjacent to an intersection area between the data lines and the scan lines of the substrate, and a first pixel formed on one side of the image display unit. A first power line to which a driving voltage is supplied, an auxiliary power line formed on the other side of the image display unit, and to which the first pixel driving voltage is supplied, and one side of which is electrically connected to the first power line and the other side of the auxiliary power line; A plurality of pixel power lines electrically connected to a power line and supplying the first pixel driving voltages from the first power line and the auxiliary power line to the respective pixels, and electrically between the first power line and the auxiliary power line Connected to and compensate for voltage drops of the first pixel driving voltages supplied to one side and the other side of the plurality of pixel power lines. Provided with a residence compensating means.

The light emitting display device includes a second power line formed on the substrate and supplying a second pixel driving voltage to each pixel, first pads formed on the substrate and connected to the first power line, and the first power line. A pad portion including second pads connected to a second power line and third pads connected to the second power line, a scan driving circuit for supplying a selection signal to the scan lines, and a data signal to the data lines It further comprises a data driving circuit for supplying.

The light emitting display device includes a power generation unit for generating the first and second pixel driving voltages, and a signal transfer unit for transferring the first pixel driving voltage from the power generation unit to the first and second pads. It is further provided.

In the light emitting display device, the signal transmitting means includes a pixel driving voltage supply line for supplying the first pixel driving voltage to the first and second pads from the power generator.

In the light emitting display device, the impedance compensating means is a resistor electrically connected between the pixel driving voltage supply line and the second pad.

In the light emitting display device, the first power line is formed along an edge of the substrate except for the pad part to be electrically connected to the first pads, and the auxiliary power line is disposed between the pad part and a lower side of the image display part. And are electrically connected to the second pads.

In the light emitting display device, the impedance compensating means compensates for the voltage drop caused by the line resistance of the auxiliary power line to be equal to the voltage drop caused by the line resistance of the first power line.

In the light emitting display device, the data driving circuit is disposed between the pad unit and the auxiliary power line and one of the signal transmitting means.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5 attached to the most preferred embodiments which can be easily implemented by those skilled in the art.

Referring to FIG. 3, a light emitting display device according to an exemplary embodiment of the present invention includes a substrate 110 and a light emitting device disposed to be adjacent to an intersection region of data lines D and scan lines S formed on the substrate 110. And an image display unit 112 having a plurality of pixels 111 including pixel circuits for emitting light emitting elements, and one side of the image display unit 112 to supply the first pixel driving voltage to the image display unit 112. The first power line 140, the auxiliary power line 144 for supplying the first pixel driving voltage to the image display unit 112 from the other side of the image display unit 112, the first power line 140, and the auxiliary power source. A plurality of pixel power lines VDD electrically connected to the line 144 to supply the first pixel driving voltage to each pixel 111, and a plurality of pixels 111 on one side of the image display unit 112; The second power supply line 142 for supplying the two pixel driving voltage, the first power supply line 140 and the auxiliary power supply line 144 Impedance compensation means 164 is provided to compensate for the difference in the IR drop.

In addition, the light emitting display device according to an exemplary embodiment of the present invention includes a scan driving circuit 120 for supplying a selection signal to the scan lines S, and a data driver circuit 130 for supplying a data signal to the data lines D. FIG. ), A pad unit 150 to which data signals, voltages, scan and data control signals are supplied from the outside, a controller 170 for supplying data signals, scan and data control signals to the pad unit 150, A flexible printed circuit (FPC) 150 is further provided for connecting the controller 170 to the pad unit 150.

The pixel circuit is controlled by the selection signal supplied to the scan line S, and controls the amount of current supplied from the pixel power supply line VDD to the light emitting element according to the data signal supplied to the data line D. Accordingly, the light emitting element of each pixel 111 emits light by the current supplied from the pixel circuit to display an image.

The anode electrode of the light emitting element is connected to the pixel circuit, and the cathode electrode is connected to the second power supply line 142. The light emitting device includes an emission layer (EML), an electron transport layer (ETL), and a hole transport layer (HTL) formed between the anode electrode and the cathode electrode. The organic light emitting diode OLED may further include an electron injection layer (EIL) and a hole injection layer (HIL). When a voltage is applied between the anode electrode and the cathode electrode of the organic light emitting diode OLED, electrons generated from the cathode electrode move to the emission layer EML through the electron injection layer EIL and the electron transport layer ETL, Electrons generated from the anode electrode move to the light emitting layer via the hole injection layer HIL and the hole transport layer HTL. Then, light is generated by recombination of electrons supplied from the electron transport layer ETL and holes supplied from the hole transport layer HTL in the emission layer.

The controller 170 includes a controller 172 and a power generator 174 for generating voltages. The controller 172 generates scan control signals for controlling the driving timing of the scan driving circuit 120, and generates data control signals for controlling the driving timing of the data driving circuit 130. In addition, the controller 172 supplies a data signal from the outside to the data driving circuit 130. The controller 172 controls the power generator 174.

The power generator 174 generates power VCC required for driving the first and second pixel driving voltages, the data driving circuit 130, and the scan driving circuit 120 under the control of the controller 172. In this case, the second pixel driving voltage has a voltage level lower than that of the first pixel driving voltage, and may be, for example, a ground level.

The FPC 160 is electrically connected to the pad portion of the controller 170 by an anisotropic conductive film (not shown) and electrically connected to the pad portion 150 of the substrate 110. On the FPC 160, signal lines for transmitting the data signal, the data control signal, and the scan control signal supplied from the controller 172 to the pad unit 150 of the substrate 110 are formed. In addition, a first pixel driving voltage supply line 162 is formed on the PFC 160 to transfer the first pixel driving voltage supplied from the power generator 174 to the pad unit 150 of the substrate 110. In addition, on the FPC 160, the power supply VCC and the second pixel driving voltage required for driving the data driving circuit 130 and the scan driving circuit 120 from the power generating unit 174 are applied to the pad portion of the substrate 110. Voltage lines for supplying 150 are formed.

The pad unit 150 is connected to both ends of the first power line 140 via the first signal lines 144a and 144b and through the second signal lines 137a and 137b. Second pads Pvdd2 electrically connected to both ends of the auxiliary power line 144, and third pads Pvss electrically connected to the second power line 142 through the third signal line 146. And fourth pads Ps electrically connected to the scan driving circuit 120 through the scan signal line 135, and electrically connected to the data driver circuit 130 through the first data signal line 132. 5 pads Pd.

The first pads Pvdd1 are electrically connected to the first pixel driving voltage supply line 162 formed in the FPC 160. Accordingly, the first pixel driving voltage is supplied to the first pads Pvdd1 from the power generator 174 via the FPC 160.

The second pads Pvdd2 are electrically connected to the first pixel driving voltage supply line 162 formed in the FPC 160. Accordingly, the first pixel driving voltage is supplied to the second pads Pvdd2 from the power generator 174 via the FPC 160.

The impedance compensating means 164 is formed between the pad of the FPC 160 electrically connected to the second pads Pvdd2 formed on the substrate 110 and the first pixel driving voltage supply line 162 formed on the FPC 160. do. The impedance compensation means 164 compensates the voltage drop of the first pixel driving voltage supplied from the first pixel driving voltage supply line 162 to the auxiliary power supply line 144 as a resistor. That is, the impedance compensating means 164 drives the first pixel supplied to the auxiliary power line 144 to equalize the difference in line resistance according to the line lengths of the first power line 140 and the auxiliary power line 144. Compensating for the voltage.

More detailed description is as follows. First, the first points X1 and X3 of the first power line 140 adjacent to the first pads Pvdd1 of the pad unit 150 of the substrate 110 and the upper portion of the image display unit 112 are located. The voltage drop due to the line resistance of the second points X3 and X4 of the first power line 140 is referred to as the first voltage drop V _{IR 1} , and the second pads of the pad part 150 of the substrate 110 are referred to as the first voltage drop V _{IR 1} . By the line resistances of the first points Y1 and Y3 of the auxiliary power line 144 adjacent to Pvdd2 and the second points Y3 and Y4 of the auxiliary power line 144 positioned below the image display unit 112. Assume that the resulting voltage drop is the second voltage drop V _{IR 2} . Accordingly, the impedance compensating means 164 compensates the impedance so that the first voltage drop V _{IR 1} of the first power line 140 and the second voltage drop V _IR1 of the auxiliary power line 144 are the same. do. Accordingly, the pixel driving voltage supplied to one side of the plurality of pixel power lines VDD from the second points X2 and X4 of the first power line 140 and the second points Y2 and Y4 of the auxiliary power line 144. ), The pixel driving voltages supplied to the other of the plurality of pixel power lines VDD become the same.

The second pad driving voltages are supplied to the third pads Pvss from the power generator 174 via the FPC 160. The fourth pads Ps are supplied with the scanning control signal from the controller 172 via the FPC 160, and the fifth pads Pd are supplied with the data control signal from the controller 172 via the FPC 160. And a data signal is supplied.

The first power line 40 is formed along the edge of the substrate 10 except for the pad portion 50. The first power line 40 supplies the first pixel driving voltage transmitted from the first pads Pvdd1 of the pad unit 50 to the plurality of pixel power lines VDD.

The auxiliary power line 44 is formed to be adjacent to the other side of the image display unit 12. The auxiliary power line 44 supplies the first pixel driving voltage transmitted from the second pads Pvdd2 of the pad unit 50 to the plurality of pixel power lines VDD.

One side of each of the plurality of pixel power lines VDD is commonly connected to the first power line 140 adjacent to the upper side of the image display unit 112, and the other side thereof is the auxiliary power line 144 adjacent to the lower side of the image display unit 112. ) Are commonly connected. Each of the pixel power lines VDD is formed from the auxiliary power line 144 supplied with the first pixel driving voltage and the first pixel driving voltage compensated by the impedance compensating means 164 from the first power line 140. One pixel driving voltage is simultaneously supplied to the pixel 111.

The second power supply line 142 is formed between the right side of the image display unit 112 and the first power supply line 140, and is electrically connected to the cathode electrode of the light emitting element formed on the front surface of the image display unit 112. The second power line 142 supplies the second pixel driving voltage transmitted from the third pads Pvss of the pad unit 150 to the cathode electrode of the light emitting device.

The data driving circuit 130 is disposed to be adjacent to the pad unit 150 formed on the substrate 110, and is electrically connected to the fifth pads Pd through the first data signal line 132. It is electrically connected to the data line D through 134. In this case, the data driving circuit 130 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, and may be directly formed on the substrate 110. have. The data driving circuit 130 receives a data control signal and a data signal supplied from the fifth pads Pd and outputs a data signal of one horizontal line every one horizontal period according to the data control signal. To feed.

The scan driving circuit 120 is formed between one side of the image display unit 112 and the first power line 140 and is electrically connected to the fourth pads Ps through the scan signal line 135. The scan driving circuit 120 generates a sequential selection signal according to a scan control signal supplied from the fourth pads Ps via the scan signal line 135 to the scan lines S of the image display unit 112. Supply. To this end, the scan driving circuit 120 is composed of a plurality of shift registers for generating a sequential selection signal in response to the scan control signal.

The pixel circuit of each pixel 111 is formed to be adjacent to the intersection of the data line D, the scan line S, and the pixel power supply line VDD. The pixel circuit controls the amount of current supplied from the pixel power supply line VDD to the light emitting element in response to the selection signal supplied to the scanning line S. FIG. Accordingly, the light emitting element of each pixel 111 emits light by the current supplied from the pixel circuit to display an image.

As described above, in the light emitting display device according to the exemplary embodiment, the impedance compensation means 164 is provided to the first pixel driving voltage supply line 162 that supplies the first pixel driving voltage to the auxiliary power line 144 on the FPC 160. ) To compensate for the voltage drop caused by the line resistance of the auxiliary power line 144. Accordingly, in the light emitting display device according to the exemplary embodiment of the present invention, the voltage drop according to the line resistance of the first power line 140 and the voltage according to the line resistance of the auxiliary power line 144 using the impedance compensation means 164. By the same drop, the first pixel driving voltage supplied to the upper and lower edge regions of the image display portion 112 adjacent to the first and auxiliary power lines 140 and 144 can be made the same. Accordingly, the light emitting display device according to an exemplary embodiment of the present invention minimizes the variation in the amount of current supplied to each pixel 111 according to the position of the pixel 111 with respect to the same data signal. The luminance of light emitted by 111 can be made uniform.

Meanwhile, in the light emitting display device according to the embodiment of the present invention, the data driving circuit 130 may be mounted on the FPC 160 as shown in FIG. 5. In this case, the data driving circuit 130 may be mounted on a chip on board (COB) mounted on a printed circuit board (PCB), a chip on film (COP) or a tape carrier package (TCP) directly mounted on a film, in addition to the FPC 160. It can be mounted on a conventional film type connecting element employed.

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 embodiment of the present invention uses the impedance compensation means to display the voltage drop due to the line resistance along the length of the auxiliary power line that supplies the first pixel driving voltage from the lower side of the image display unit. The voltage drop of the pixel driving voltage supplied to each pixel can be minimized by making the voltage drop of the first power supply line supplying the first pixel driving voltage equal to the upper side of. Therefore, the present invention can minimize the unevenness of luminance due to the difference in voltage drop along the length of the power supply line supplying the pixel driving voltage to each pixel.

Claims (16)

Substrate, An image display unit including a plurality of pixels formed to be adjacent to an intersection area of the data lines and the scan lines of the substrate; A first power supply line for supplying the first pixel driving voltage to each pixel on one side of the image display unit; An auxiliary power supply line for supplying a first pixel driving voltage to each pixel on the other side of the image display unit; And an impedance compensation means electrically connected between the first power line and the auxiliary power line to compensate for a difference in voltage drop between the first power line and the auxiliary power line. The method of claim 1, A plurality of sides of which one side is electrically connected to the first power line and the other side is electrically connected to the auxiliary power line and supplies the first pixel driving voltage from the first power line and the auxiliary power line to the respective pixels. Pixel power line, A second power supply line formed on the substrate and configured to supply a second pixel driving voltage to each pixel; A pad portion formed on the substrate and including first pads connected to the first power line, second pads connected to the auxiliary power line, and third pads connected to the second power line; A scan driving circuit for supplying a selection signal to the scan lines; And a data driving circuit for supplying data signals to the data lines. The method of claim 2, A power generator configured to generate the first and second pixel driving voltages; And a signal transmitting means for transmitting the first pixel driving voltage from the power generator to the first and second pads. The method of claim 3, wherein And the signal transmitting means includes a pixel driving voltage supply line for supplying the first pixel driving voltage to the first and second pads from the power generator. The method of claim 4, wherein And the impedance compensating means is a resistor electrically connected between the pixel driving voltage supply line and the second pad. The method of claim 2, The first power line is formed along an edge of the substrate except for the pad part to be electrically connected to the first pads. And the auxiliary power line is formed between the pad portion and the lower side of the image display portion to be electrically connected to the second pads. The method of claim 6, And the impedance compensating means compensates for the voltage drop caused by the line resistance of the auxiliary power line to be equal to the voltage drop caused by the line resistance of the first power line. The method of claim 3, wherein The data driving circuit is disposed between any one of the pad unit and the auxiliary power line and the signal transmission means. Substrate, An image display unit including a plurality of pixels formed to be adjacent to an intersection area of the data lines and the scan lines of the substrate; A first power supply line formed on one side of the image display unit and supplied with a first pixel driving voltage; An auxiliary power line formed on the other side of the image display unit and supplied with the first pixel driving voltage; A plurality of sides of which one side is electrically connected to the first power line and the other side is electrically connected to the auxiliary power line and supplies the first pixel driving voltage from the first power line and the auxiliary power line to the respective pixels. Pixel power line, And an impedance compensating means electrically connected between the first power line and the auxiliary power line and configured to compensate for a voltage drop of the first pixel driving voltage supplied to one side and the other side of the plurality of pixel power lines. The method of claim 9, A second power supply line formed on the substrate and configured to supply a second pixel driving voltage to each pixel; A pad portion formed on the substrate and including first pads connected to the first power line, second pads connected to the auxiliary power line, and third pads connected to the second power line; A scan driving circuit for supplying a selection signal to the scan lines; And a data driving circuit for supplying data signals to the data lines. The method of claim 10, A power generator configured to generate the first and second pixel driving voltages; And a signal transmitting means for transmitting the first pixel driving voltage from the power generator to the first and second pads. The method of claim 11, And the signal transmitting means includes a pixel driving voltage supply line for supplying the first pixel driving voltage to the first and second pads from the power generator. The method of claim 12, And the impedance compensating means is a resistor electrically connected between the pixel driving voltage supply line and the second pad. The method of claim 10, The first power line is formed along an edge of the substrate except for the pad part to be electrically connected to the first pads. And the auxiliary power line is formed between the pad portion and the lower side of the image display portion to be electrically connected to the second pads. The method of claim 14, And the impedance compensating means compensates for the voltage drop caused by the line resistance of the auxiliary power line to be equal to the voltage drop caused by the line resistance of the first power line. The method of claim 11, The data driving circuit is disposed between any one of the pad unit and the auxiliary power line and the signal transmission means.

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