KR20070066208A - Light emitting device including a panel to which pectination is generated - Google Patents

Abstract

A light emitting device including a panel for preventing a stripe pattern noise is provided to reduce a panel error by implementing a both-directional scan line between first and second direction scan lines. A light emitting device includes data lines(D1~D5), scan lines(S1~S5), and plural pixels(E11~E55). The data lines are arranged in a first direction. The scan lines are arranged in a second direction, which is different from the first direction. The pixels are formed in regions, where the data and scan lines cross with each other. Both ends of at least one scan line are connected to a light emitting source in light emitting. One end of the scan line is connected to a compensation resistor(R), that is, a variable resistor.

Description

LIGHT EMITTING DEVICE INCLUDING A PANEL TO WHICH PECTINATION IS GENERATED}

1A is a block diagram showing a conventional light emitting device.

FIG. 1B is a circuit diagram illustrating the panel of FIG. 1A.

1C is a plan view illustrating some pixels.

1D is a timing diagram illustrating the scan line and the data current.

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

3 is a circuit diagram illustrating the panel of FIG. 2.

4A through 4C are plan views illustrating some pixels included in the panel.

The present invention relates to a light emitting device, and more particularly to a light emitting device including a panel that does not generate a comb pattern.

The light emitting device generates light having a predetermined wavelength when a predetermined voltage is applied.

1A is a block diagram showing a conventional light emitting device.

Referring to FIG. 1A, 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 pixels E11 to E54 formed in light emitting regions where the data lines D1 to D5 and the scan lines S1 to S5 cross each other.

The controller 102 receives display data and transmits the received display data to the data driver 108. In addition, the controller 102 controls the operations of the scan drivers 104 and 106.

The first scan driver 104 is connected to the scan lines S1 and S3 arranged in the first direction and transmits the first scan signals to the scan lines S1 and S3.

The second scan driver 106 is connected to the scan lines S2 and S4 arranged in a second direction different from the first direction, and transmits the second scan signals to the scan lines S2 and S4.

As a result, the scan lines S1 to S4 are sequentially connected to the ground.

The data driver 108 provides data currents corresponding to the display data transmitted from the controller 102 to the data lines D1 to D5.

When one scan line is connected to ground and a data current is provided to the data lines D1 to D5, pixels corresponding to the scan line emit light.

FIG. 1B is a circuit diagram illustrating the panel of FIG. 1A, and FIG. 1C is a plan view showing some pixels. 1D is a timing diagram showing scan lines and data currents.

Referring to FIG. 1B, scan lines S1 and S3 formed in the first direction and scan lines S2 and S4 formed in the second direction are alternately formed.

Hereinafter, the operation of the pixels E11 to E54 will be described in detail. However, as shown in FIG. 1B, the resistance of the portion corresponding to the outer corners of the outermost data lines D1 and D5 among the scan lines S1 to S4 is set to 60 Ω, and the pixels E11 to E54. I will set the resistance of the part in between to 10Ω.

First, the first scan line S1 is connected to ground, and the second to fourth scan lines S2 to S4 have a voltage V1 having the same magnitude as the driving voltage for driving the pixels E11 to E54. It is connected to a non-light emitting source. Therefore, only pixels E11 to E51 corresponding to the first scan line S1 emit light.

Subsequently, a second scan line S2 formed in a direction different from the first scan line S1 is connected to ground, and the first, third and fourth scan lines S1, S3, and S4 are connected to the non-light emitting source. . Therefore, only pixels E12 to E52 corresponding to the second scan line S2 emit light.

In this case, the resistors R11 to R51 corresponding to the pixels E11 to E51 corresponding to the first scan line S1 and the pixels E12 to E52 corresponding to the second scan line S2 may be used. The resistors R12 to E52 will be compared with reference to FIG. 1C.

Referring to FIG. 1C, the resistance values R11 and R12 corresponding to the first data line D1 have a difference of 40Ω, and the resistance values R21 and R22 corresponding to the second data line D2 may be different from each other. The resistances R31 and R32 corresponding to the third data line D3 have the difference of 20Ω and are the same. In addition, the resistance values R41 and R42 corresponding to the fourth data line D4 have a difference of 20Ω, and the resistance values R51 and R52 corresponding to the fifth data line D5 have a difference of 40Ω. Have

Hereinafter, the correlation between the resistance values and the luminance of the pixels E11 to E55 will be described with reference to FIG. 1D. However, the case where the eleventh pixel E11 emits light will be taken as an example.

Referring to FIG. 1D, the first data current I1 is applied to the eleventh pixel E11 through the first data line D1 in the low logic area among the first scan signals transmitted to the first scan line S1. do. In this case, ideally the first data current I1 should have a predetermined value I _W during the low logic region, but in practice due to the influence of the resistance of the first scan line S1 as shown in FIG. 1D. It has a value I _U smaller than the predetermined value I _W. That is, the data current is affected by the corresponding resistance, so that the luminance of the pixels E11 to E54 could vary depending on the resistance values of the resistors R11 to R55.

In the above, the case in which the luminance of the pixels E11 to E54 is lowered by the influence of the resistors R11 to R54 has been described above, but may be higher in some cases.

Hereinafter, the operation of the panel 100 will be described in detail again.

Referring back to FIG. 1C, the resistance values R11 and R12 corresponding to the first data lines D1 have a large difference therebetween, and thus are preset such that the same data current is provided to the pixels E11 and E12. In spite of this, the luminance difference occurred between the pixels E11 and E12 due to the influence of the resistors R11 and R12. This luminance difference has caused a visually perceived stripe (hereinafter, referred to as a "comb") in the portion of the panel 100 corresponding to the pixels E11 and E12.

In addition, a luminance difference also occurs between the pixels E12 to E54 corresponding to the other data lines D2 to D5. However, the luminance difference is most pronounced between the pixels E11 to E14 and E15 to E54 corresponding to the first and fifth data lines D1 and D5. As a result, a comb pattern is distinctly generated between the pixels E11 to E14 and E15 to E54 corresponding to the first and fifth data lines D1 and D5, so that people are not visually inconvenienced due to the comb pattern. Could feel.

An object of the present invention is to provide a light emitting device in which a comb pattern is not generated.

In order to achieve the above object, the light emitting device according to the preferred embodiment of the present invention includes data lines, scan lines and a plurality of pixels. The data lines are arranged in one direction, and the scan lines are arranged in a direction different from the direction in which the data lines are arranged. The pixels are formed in regions where the data lines and the scan lines intersect. Here, both ends of the at least one scan line are all connected to the light emitting source during light emission, and a compensation resistor is connected to one end of the scan line.

In the light emitting device according to the present invention, since the scan line formed in both directions is located between the scan line formed in the first direction and the scan line formed in the second direction, the comb pattern does not occur in the panel.

In addition, in the light emitting device according to the present invention, since the error generated in the panel fabrication process is compensated for using the compensation resistor R, the defect of the panel may be reduced.

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

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

Referring to FIG. 2, the light emitting device of the present invention includes a panel 200, a controller 202, a first scan driver 204, a second scan driver 206, and a data driver 208.

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 200 includes a plurality of pixels E11 to E55 formed in light emitting regions where the data lines D1 to D5 and the scan lines S1 to S5 intersect, and each of the pixels E11 to E55) includes an anode electrode layer, an organic material layer and a cathode electrode layer sequentially stacked on a substrate. The organic layer includes a hole transporting layer (HTL), an emission layer (EML), and an electron transporting layer (ETL) sequentially stacked on the anode electrode layer.

When a positive voltage is applied to the anode electrode layer and a negative voltage is applied to the cathode electrode layer, the HTL transports holes provided from the anode electrode layer to the EML, and the ETL transports electrons provided from the cathode electrode layer to the EML. do. The holes and electrons provided above then recombine in the EML, so that light of a predetermined wavelength is emitted from the EML.

The controller 202 receives display data from the outside and transmits the received display data to the data driver 208. In addition, the controller 202 controls the operations of the first scan driver 204, the second scan driver 206, and the data driver 208.

The control unit 202 according to another embodiment of the present invention stores the received display data or stores it in an external memory (not shown).

The first scan driver 204 is connected to the scan lines S1 to S3 formed in the first direction and transmits the first scan signals to the scan lines S1 to S3.

The second scan driver 206 is connected to scan lines S3 to S5 formed in a second direction different from the first direction, and transmits second scan signals to the scan lines S3 to S5. Here, the third scan line S3 is connected to both the first scan driver 204 and the second scan driver 206 as shown in FIG. 2. However, the compensation resistor R is connected to one end of the third scan line S3 as shown in FIG. 2. The compensation resistor R according to an embodiment of the present invention is a variable resistor.

Hereinafter, the positional relationship of the scan lines S1 to S5 will be described in detail.

The light emitting device of the present invention includes at least one scan line arranged in both directions, that is, connected to both the first scan driver 204 and the second scan driver 206. Here, the bidirectionally arranged scan lines may be located between scan lines arranged in the same direction or may be located between the scan lines arranged in the first direction and the scan lines arranged in the second direction. . Preferably, the bidirectionally arranged scan lines are located between the scan lines arranged in the first direction and the scan lines arranged in the second direction. The reason for arranging the scan lines will be described in detail below with reference to the accompanying drawings.

The scan lines arranged in both directions may be dummy scan lines added to conventional scan lines, or scan lines in which some of the conventional scan lines have changed designs.

The data driver 208 provides data signals corresponding to the display data transmitted from the controller 202, that is, data current, to the data lines D1 to D5. Here, the data current is synchronized with the scan signals under the control of the controller 202.

The controller 202 controls both ends of the scan line formed in both directions to be simultaneously connected to the ground when emitting light.

3 is a circuit diagram illustrating the panel of FIG. 2, and FIGS. 4A to 4C are plan views illustrating some pixels included in the panel.

Referring to FIG. 3, the first and second scan lines S1 and S2 are arranged in a first direction, and the fourth and fifth scan lines S4 and S5 are arranged in a second direction different from the first direction. Are arranged. In addition, the third scan line S3 is arranged in both directions, and a compensation resistor R is connected to one end thereof.

Hereinafter, the operation of the pixels E11 to E55 will be described in detail. However, as shown in FIG. 3, the resistances of the parts corresponding to the outer corners of the outermost data lines D1 and D5 among the scan lines S1 to S5 are set to 60Ω and 140Ω, respectively, and the pixels E11. To E55), the resistance of the corresponding part is set to 10?. Then, the compensation resistor (R) is set to 0 Ω.

First, the first scan line S1 is connected to a light emitting source having a low scan driving voltage, for example, ground, and the second to fifth scan lines S2 to S5 drive the pixels E11 to E55. It is connected to a non-light emitting source having the same size V1 as the data driving voltage. Hereinafter, for convenience of explanation, the light emitting source will be referred to as ground.

In this case, since the data current provided to the data lines D1 to D5 has a magnitude between the low scan driving voltage and the data driving voltage, the data current corresponds to the pixels corresponding to the first scan line S1 ( Through E11 to E51 only to the ground. Therefore, only the pixels E11 to E51 corresponding to the first scan line S1 emit light.

Subsequently, the second scan line S2 arranged in the same direction as the first scan line S1 is connected to ground, and the first, third, fourth and fifth scan lines S1, S3, S4 and S5 are connected to the ground. It is connected to a non-light emitting source. Therefore, only the pixels E12 to E52 corresponding to the second scan line S2 emit light.

Hereinafter, the resistors R11 to R51 corresponding to the first scan line S1 and the resistors R12 to E52 corresponding to the second scan line S2 will be compared with reference to FIG. 4A.

Referring to FIG. 4A, resistance values of the resistors R11 and R12 corresponding to the first data line D1 are the same and resistance values of the resistors R21 and R22 corresponding to the second data line D2 are the same. Are the same, and resistance values of the resistors R31 and R32 corresponding to the third data line D3 are the same. In addition, the resistance values of the resistors R41 and R42 corresponding to the fourth data line D4 are the same, and the resistance values of the resistors R51 and R52 corresponding to the fifth data line D5 are the same. Therefore, a luminance difference does not occur between the pixels E11 to E51 corresponding to the first scan line S1 and the pixels E12 to E52 corresponding to the second scan line S2, so that the first scan line A comb pattern is not formed between S1 and the second scan line S2. In short, a comb pattern is not formed between scan lines formed in the same direction.

Referring back to FIG. 3, the ends of the third scan line S3 are connected to ground, and the remaining scan lines S1, S2, S4 and S5 are connected to the non-light emitting source. Therefore, only pixels E13 to E53 corresponding to the third scan line S3 emit light.

Hereinafter, the resistors R12 to R52 corresponding to the second scan line S2 and the resistors R13 to E53 corresponding to the third scan line S3 will be compared with reference to FIG. 4B.

Referring to FIG. 4B, the resistance value of the twelfth resistor R12 corresponding to the first data line D1 and the resistance value of the thirteenth resistor R13 have a predetermined difference. ) And the thirteenth pixel E13 occur. However, since the difference between the resistance values R12 and R13 is small unlike in the conventional light emitting device, such luminance difference is not visually recognized by the user who uses the panel 200. Similarly, although a luminance difference occurs between the pixels E12 to E52 corresponding to the second scan line S2 and the pixels E13 to E53 corresponding to the third scan line S3, the luminance difference is determined by the user. It is not recognized. That is, a comb fringe does not occur between the second scan line S2 and the third scan line S3. In other words, no comb pattern occurs between the scan lines arranged in the first direction and the scan lines arranged in both directions.

Subsequently, the fourth scan line S4 is connected to ground, and the remaining scan lines S1, S2, S3, and S5 are connected to the non-light emitting source. Therefore, only the pixels E14 to E54 corresponding to the fourth scan line S4 emit light.

Hereinafter, the resistors R13 to R53 corresponding to the third scan line S3 and the resistors R14 to E54 corresponding to the fourth scan line S3 will be compared with reference to FIG. 4C.

Referring to FIG. 4C, the magnitudes of the resistance values of the resistors R13 to R53 corresponding to the third scan line S3 and the resistance values of the resistors R14 to R54 corresponding to the fourth scan line S4. Therefore, a luminance difference occurs between the pixels E13 to E53 corresponding to the third scan line S3 and the pixels E14 to E54 corresponding to the fourth scan line S4. However, since the luminance difference between the resistors R13 to R53 corresponding to the third scan line S3 and the resistors R14 to R54 corresponding to the fourth scan line S4 is small, this luminance difference is visually visible to the user. Not recognized. Therefore, no comb fringe is generated between the third scan line S3 and the fourth scan line S4. In other words, no comb pattern occurs between the scan lines formed in the second direction and the scan lines formed in both directions.

As described above, in the light emitting device of the present invention, the comb pattern is not generated between the scan lines arranged in the same direction, and the comb pattern is not formed between the scan lines arranged in one direction and the scan lines arranged in both directions. Do not.

In the light emitting device according to the embodiment of the present invention, the scan lines arranged in both directions are always located between the scan lines arranged in the first direction and the scan lines arranged in the second direction.

Hereinafter, the compensation resistor R will be described in detail.

The scan lines arranged in both directions are designed to have resistance values as mentioned above, but errors may occur in the process of manufacturing the panel 200. As a result, scan lines arranged in both directions may have brighter brightness than other scan lines. Therefore, in the light emitting device of the present invention, an error that may be generated by the process of manufacturing the panel 200 is compensated for using the compensation resistor R.

For example, when the third scan line S3 arranged in both directions is designed to have 140Ω, but actually has 60Ω, the compensation resistor R having a size of 80Ω is connected to the third scan line S3.

In this manner, after the panel 200 is manufactured, an error is detected through an experiment, and a compensation resistor R corresponding to the detected error is coupled to the third scan line R.

Alternatively, the compensation resistor R is made variable so that the compensation resistor R is changed to compensate for the detected error.

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

As described above, in the light emitting device according to the present invention, since the scan line formed in both directions is located between the scan line formed in the first direction and the scan line formed in the second direction, the comb pattern does not occur in the panel. have.

In addition, in the light emitting device according to the present invention, since the error generated in the panel manufacturing process is compensated for using the compensation resistor R, the defect of the panel is reduced.

Claims (8)

Data lines arranged in one direction; Scan lines arranged in a direction different from a direction in which the data lines are arranged; And A plurality of pixels formed in regions where the data lines and the scan lines cross each other; Both ends of the at least one scan line are all connected to a light emitting source during light emission, and a compensation resistor is connected to one end of the scan line. The light emitting device of claim 1, wherein the compensation resistor is a variable resistor. The method of claim 1, wherein the scan lines, First scan lines arranged in a first direction; And Second scan lines arranged in a second direction different from the first direction, And a scan line connected to the light emitting source is arranged in both the first direction and the second direction. 4. The light emitting device of claim 3, wherein the light emitting source is ground. The light emitting device of claim 3, wherein the first scan lines arranged in the first direction are sequentially positioned with each other, and the second scan lines arranged in the second direction are also sequentially located with each other. The light emitting device of claim 1, wherein the scan line connected to the light emitting source has a larger resistance value than the remaining scan lines. The light emitting device of claim 1, wherein one end of the scan line formed in both directions is connected to a first light emitting source having a low scan driving voltage, and the other end of the scan line has a low scan driving voltage through the compensation resistor. Light emitting device, characterized in that connected to the circle. The method of claim 1, wherein the light emitting element, A first scan driver connected to scan lines arranged in a first direction among the scan lines; A second scan driver connected to scan lines arranged in a second direction different from the first direction; And Light emitting device further comprises a control unit for controlling the operation of the scan driver.

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