KR101166408B1 - AMOLED and driving method thereof - Google Patents

Abstract

The present invention relates to a driving method, and more particularly, to a driving method of an organic light emitting display panel which can improve the block dim phenomenon generated on the panel according to the variation of the output characteristics of the data drive IC.

According to the present invention, a plurality of horizontal pixel columns and a plurality of vertical pixel columns are provided using a driver driver IC divided into A group output data and B group output data according to characteristics of each data output from the plurality of output pins. A method of driving a display panel, wherein the A group output data and the B group output data are alternately inputted to each horizontal pixel column for each pixel, and output data is input to different pixels in the first pixel of two adjacent horizontal pixel columns. As a result, while the panel driving is performed by reducing the driver driver IC, the pixel block dim phenomenon does not occur on the panel, thereby providing an improved image quality.

Description

A method of driving an organic electroluminescent display device

1 is a view for explaining the structure of a conventional active matrix organic electroluminescent display device

2 is a panel data input diagram for explaining driving of a conventional driving drive IC reduced type organic electroluminescent display device.

3A and 3B are horizontal pixel column and frame data input diagrams for explaining the driving of the organic light emitting display device according to the first aspect of the present invention, respectively.

4A and 4B are horizontal pixel column and frame data input diagrams for explaining the driving of the organic light emitting display device according to the second aspect of the present invention, respectively.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

A, B, C, D: Drive Driver IC Output Characteristics Group

110: driver driver IC 100: display panel

①, ②: first and second horizontal pixels

The present invention relates to a driving method, and more particularly, to a driving method of an organic light emitting display panel which can improve the block dim phenomenon generated on the panel according to the variation of the output characteristics of the data drive IC.

 The active matrix liquid crystal display (AMLCD) device, which is a display device that is widely used these days, has the characteristics of low light and low power consumption, but has a disadvantage of using a backlight because it does not have its own light emitting property. .

A display device for solving the drawbacks of AMLCD is an active matrix organic EL display device. The EL of an organic electroluminescence (EL) display device is a self-luminous display device that electrically excites fluorescent organic compounds to emit light. It is possible and has advantages such as thinness.

FIG. 1 is a diagram illustrating a structure and a driving method of a conventional active matrix organic electroluminescent display device, and illustrates a two-transistor pixel structure.

 Switching PMOS transistor P1 and capacitor C1 between the scan lines S1, S2,... Sm arranged in a matrix form, and the data lines D1, D2,..., Dn, respectively. And a driving PMOS transistor P2 and an organic light emitting diode element OEL.

The gate of the switching PMOS transistor P1 is connected to the scan line, and the source is connected to the data line. One side of the capacitor C1 is connected to the drain of the switching PMOS transistor P1 and the other side is connected to the voltage Vdd. The source of the driving PMOS transistor P2 is connected to the voltage Vdd, the gate is connected to the drain of the switching PMOS transistor P1, and the drain is connected to the anode of the organic light emitting diode device OEL.

The driving method of the apparatus shown in FIG. 1 will now be described.

When the switching PMOS transistor P1 is turned on by the positive selection voltage applied to the scan line, charge is accumulated in the capacitor C1 by the voltage Vdd applied to the data line. The amount of current flowing in the driving PMOS transistor P2 is determined by the voltage of the capacitor C1, and the organic light emitting diode OEL is emitted by the determined amount of current, and the amount of light emitted is determined.

In the above-described method, data is applied through the data lines D1, D2, ..., Dn to the corresponding scan line while sequentially enabling the scan lines S1, S2, ..., Sm.

BACKGROUND OF THE INVENTION Organic electroluminescent display devices driven by the basic structure and principle as described above have recently become increasingly high resolution and large area with the development of technology.

According to this trend, the number of driver driver ICs for panel driving is also increased. As the increase of driver driver ICs leads to an increase in manufacturing cost, a single output configured in the driver driver ICs in order to reduce the number of driver driver ICs has recently been increased. A method of driving an entire panel by supplying data to two or more pixels through pins has been presented.

However, a problem occurs in the above-described driving driver IC reduction type driving, and a deviation occurs in the data output output through each output pin of the driving driver IC. For example, if the total number of output pins of the driver driver IC is 600, a part of each output pin has an output error of ± 3nA at a reference current of 10nA and another part has an output error of ± 5nA at a reference current of 10nA. There arises a phenomenon that an output deviation such as this occurs. This phenomenon is caused by the variation of the silicon wafer for driver IC generation, and is a phenomenon that occurs in most driver driver ICs.

The driving method proposed in consideration of the output deviation of the driving driver IC is illustrated in FIG. 2.

FIG. 2 is a panel data input diagram for explaining a driving method of a conventional driving drive IC reduced type organic light emitting display panel, and is group A classified by common output characteristics of output pins of each driving drive IC 10. And a driving method for applying data to each pixel of the panel through the B group. For convenience of explanation, the number of output pins in each group should be N.

First, the data output from the N output pins included in the output group A of the driver driver IC 10 is {A1, A1 ', A2, A2', A3, A3 ', ..., AN, AN'}. The data output from the N output pins included in the output group B is referred to as {B1, B1 ', B2, B2', B3, B3 ', ..., BN, BN'}. At this time, for example, the relationship between A1 and A1 'is data output from the same output pin and is data applied to different pixels.

In the panel driving method using the driving driver IC 10 which generates the above-described output, as shown in FIG. 2, when data is applied to one horizontal pixel column, the data outputted from groups A and B having different output characteristics are alternated. The data application position for each output group applied to each horizontal pixel column is applied to be the same. That is, a method of inputting data output from each output group A and B into a pixel such as {A1, A1 ', B1, B1', ..., AN, AN ', BN, BN'} for each horizontal pixel column to be.

However, in the driving method as described above, the method of applying data to one horizontal pixel column alternately inputs data output from each output pin of the output group A and B, but the data application position of each output group is the same for each horizontal pixel column. Dim in the vertical line direction is generated at the pixel boundary portion to which the data output from the other output group is applied.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a driving method in which a dim phenomenon does not occur on a panel when driving a driving drive IC reduced type organic light emitting display device.

The present invention to achieve the above object,

As a first proposal,

A method of driving a display panel having a plurality of horizontal pixels and a plurality of vertical pixels using a driver driver IC divided into A group output data and B group output data according to characteristics of each data output from a plurality of output pins. As

Data is input to each pixel of an m-th horizontal pixel column among the plurality of horizontal pixel columns in the order of A and B groups, and B and A to each pixel of an m + 1-th horizontal pixel column of the plurality of horizontal pixel columns. A driving method of an organic light emitting display device is characterized by inputting data in group order.

In the driving method, m is a natural number of at least one.

In the above driving method, each pixel is provided with sub-pixels for displaying red, green, and blue colors.

In the driving method, the grouping method of the output data may be classified according to an output error generated through a plurality of channels of the driving driver IC.

In the driving method, each output pin of the driving driver IC outputs data to two or more pixels per horizontal pixel column.

The driving method may be characterized in that the sequence of output data input groups for the m th and m + 1 th horizontal pixel sequences is changed from frame to frame.

As a second aspect of the present invention,

Drives a display panel with a plurality of horizontal pixels and a plurality of vertical pixels using a driver driver IC divided into output data of A, B, C, and D groups according to the characteristics of each data output from the plurality of output pins. As a way to,

Data is input to each pixel of any m-th horizontal pixel column among the plurality of horizontal pixel columns in the order of A, B, C, and D groups, and each pixel of any m + 1-th horizontal pixel column of the plurality of horizontal pixel columns. In the following, a driving method of an organic light emitting display device is characterized by inputting data in the order of B, A, D, and C groups.

In the driving method, m is a natural number of at least one.

In the above driving method, each pixel is provided with sub-pixels for displaying red, green, and blue colors.

In the driving method, the grouping method of the output data may be classified according to an output error generated through a plurality of channels of the driving driver IC.

In the driving method, each output pin of the driving driver IC outputs data to two or more pixels per horizontal pixel column.

The driving method may be characterized in that the sequence of output data input groups for the m th and m + 1 th horizontal pixel sequences is changed from frame to frame.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

First, a method of driving an organic light emitting display device according to the present invention includes a plurality of organic light emitting display devices according to output characteristics of respective channels of the driver driver IC when the driver driver IC reduces driving to apply data to two or more pixels through one output pin. Dim phenomena caused by inputting output data of the same characteristic group every frame at the same position every horizontal pixel column when inputting output data classified into output groups (typically multiples of 2) to each pixel of the panel In order to improve the crossover, the line-by-line crossover driving changes the output group for inputting data to the pixels in the same horizontal position in the horizontal pixel column while the group for inputting data to each pixel in the horizontal pixel column is alternated by the pixel unit. Groups that input data to each pixel in the horizontal pixel column are alternated pixel by pixel A frame crossover drive is also proposed which drives the output group for inputting data into the pixel to be changed.

3A and 3B are panel data input diagrams for explaining a method of driving an organic light emitting display device according to the first aspect of the present invention. In particular, characteristics of data output from each output pin of the driver IC 110 are 2; It is a figure for demonstrating the panel drive method in the case of being divided into groups.

When the driver driver IC 110 outputs two different output characteristics according to the characteristic difference of each channel formed therein, the output data according to the A group {A1, A1 ', A2, A2', A3, A3 ',, ..., AN, AN'} and B group {B1, B1 ', B2, B2', B3, B3 ', ..., BN, BN'} . In this case, the number of output data of the same characteristic group is all unified to N for convenience of description, and means that two data of the same character having the same number are output from the same output pin of the driving driver IC 110.

Accordingly, in FIG. 3A, the A group output data and the B group output data are inputted to the first horizontal pixel column ① by inputting the output data of each group to each pixel of the panel 100 {A1, B1, A1. ', B1', ..., AN, BN, AN ', BN'} are alternately inputted by pixel, but next to the second horizontal pixel column ②, an output group for applying data to each pixel is pixel by pixel. To be reversed, apply {B1, A1, B1 ', A1', ..., BN, AN, BN ', AN'}. Of course, in the third horizontal pixel column (not shown), an output group for applying data to each pixel of the second horizontal pixel column (2) is changed for each pixel so that {A1, B1, A1 ', B1', ..., AN, Naturally, such as BN, AN ', BN'}.

When the data is input by changing the output group in the horizontal pixel unit and the vertical pixel unit as described above, the dim phenomenon is improved because the pixel block to which the data of the same output characteristic group is continuously applied does not occur.

In addition, as shown in FIG. 3B, if the output group for applying output data to each pixel is also changed in units of frames, the improvement effect of the dim phenomenon will be further increased.

Each pixel in the driving method described above is a pixel provided with sub-pixels for red, green and blue color display.

4A and 4B are panel data input diagrams for explaining a method of driving an organic light emitting display device according to a second aspect of the present invention. In particular, characteristics of data output from each output pin of the driver IC 110 are 4. It is a figure for demonstrating the panel drive method in the case of being divided into groups.

When the driver driver IC 110 outputs four different output characteristics according to the characteristic difference of each channel formed therein, the output data according to the group is A group {A1, A1 ', A2, A2', A3, A3 ',, ..., AN, AN'}, group B {B1, B1 ', B2, B2', B3, B3 ',, ..., BN, BN'}, group C {C1, C1 ', C2, C2', C3, C3 ', ..., CN, CN'}, D group {D1, D1 ', D2, D2', D3, D3 ', ..., DN, DN It is divided into four groups of '}'. In this case, the number of output data of the same characteristic group is all unified to N for convenience of description, and means that two data of the same character having the same number are output from the same output pin of the driving driver IC 110.

Referring to FIG. 4A, the A, B, C, and D group output data are inputted to the first horizontal pixel column ① by inputting the output data of each group to each pixel of the panel 100. Output data to each pixel in group order such as C1, D1, A1 ', B1', C1 ', D1', ..., AN, BN, CN, DN, AN ', BN', CN ', DN'} Next, the output group for applying data to each pixel is changed in the next second horizontal pixel column (②), and the lower horizontal pixel column of the two adjacent horizontal pixel columns has the output data input to each two pixels of the upper horizontal pixel column. Reverse the order of the groups {B1, A1, D1, C1, B1 ', A1', D1 ', C1', ..., BN, AN, DN, CN, BN ', AN', DN ', CN' } The output data is input to the pixels in the order of the following.

Of course, in the third horizontal pixel column (not shown), an output group for applying data to each pixel of the second horizontal pixel column (2) is changed again for each horizontal two pixel {A1, B1, C1, D1, A1 ', B1'. , C1 ', D1', ..., AN, BN, CN, DN, AN ', BN', CN ', DN'} is granted.

When the data is input by changing the output group in the horizontal pixel unit and the vertical pixel unit as described above, the dim phenomenon is improved because the pixel block to which the data of the same output characteristic group is continuously applied does not occur.

In addition, as shown in FIG. 4B, if the output group for applying output data to each pixel is also changed in units of frames, the improvement effect of the dim phenomenon will be further increased.

Of course, each pixel in the driving method described above is a pixel provided with sub-pixels for red, green and blue color display.

The driving method of the organic light emitting display device according to the present invention as described above has an advantage of providing an improved image quality since the pixel block dim phenomenon does not occur on the panel while driving the panel by reducing the driving driver IC.

Claims (12)

delete delete delete delete delete delete Drives a display panel with a plurality of horizontal pixel columns and a plurality of vertical pixel columns by using a driver driver IC divided into output data of A, B, C, and D groups according to the characteristics of each data output from the plurality of output pins. As a way to, Data is input to each pixel of any m-th horizontal pixel column among the plurality of horizontal pixel columns in the order of A, B, C, and D groups, and each pixel of any m + 1-th horizontal pixel column of the plurality of horizontal pixel columns. Enter data in order of B, A, D, C group, In the driving method, the sequence of output data input groups for the m th and m + 1 th horizontal pixel columns is changed from frame to frame, Each output pin of the driving driver IC outputs data to two or more pixels per horizontal pixel column through the same output pin during one frame. The method of claim 7, wherein M is a driving method of an organic light emitting display device, characterized in that at least one natural number. The method of claim 7, wherein Each pixel includes a sub-pixel for displaying red, green, and blue colors. The method of claim 7, wherein The grouping method of the output data may be classified according to an output error generated through a plurality of channels of the driving driver IC. delete delete

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