KR100632811B1 - Time division driving method and device of organic light emitting diode using pam driving type - Google Patents

Abstract

A time-division driving method and device of a PAM(Pulse Amplitude Modulation)-type OLED(Organic Light Emitting Diode) are provided to execute gamma correction even in a PAM-type driving device by displaying the middle gray scale by applying driving pulses with different display gray scales for each frame or the driving pulse after dividing each display gray scale on a software basis. In a time-division driving method of a PAM-type OLED for driving the OLED or other display elements by using PAM-type driving pulse output through a drive IC(Integrated Circuit), a middle gray scale(L2.5) between two gray scales(L2,L3) provided on a hardware basis by the drive IC is displayed by outputting the driving pulse with an amplitude modulated to make the display gray scales different for each frame(frame1~frame8).

Description

Time division driving method and device of Organic Light Emitting Diode using PAM driving type}

1 is a conceptual diagram of a general organic light emitting display device.

2 is a current waveform diagram applied to one unit pixel in a conventional PAM driving apparatus;

3 is a display characteristic curve diagram for explaining gamma correction performed in a conventional PWM system driving device.

4 is a luminance increase and decrease curve according to gamma correction of a conventional PWM drive system

5 is a block diagram illustrating an internal configuration of a second drive circuit for implementing a time division driving method of a PAM type organic light emitting diode according to the present invention.

6A and 6B are current waveform diagrams applied to one unit pixel in a time division driving apparatus of a PAM type organic light emitting diode according to an embodiment of the present invention.

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

20,30: column output circuit 40: control circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division driving method and apparatus for an organic light emitting diode (OLED), and more particularly, to an organic electroluminescent device or other display device driven by a pulse amplitude modulation method. The present invention relates to a time-division driving method and apparatus for a pulse amplitude modulation (PAM) type organic light emitting diode that enables expression of multiple gray levels and gamma correction without finely adjusting the output current of the IC.

In general, as shown in FIG. 1, an organic light emitting diode has an anode and a cathode arranged in a matrix shape of columns and rows, and an organic material is deposited at an intersection point of each column and row. In the organic light emitting diode driving device using a pulse amplitude modulation (PAM) drive pulse, the first drive circuit for supplying a scan signal to the cathode And a second drive circuit for supplying a pulse amplitude modulation (PAM) signal having an amplitude according to the gray level as a driving signal to the anode.

In the conventional PAM type organic light emitting diode driving apparatus, a method of expressing display data having a desired gray level is equally applied to a driving current of a desired gray level in each frame constituting one unit pixel.

FIG. 2 illustrates a current waveform applied to one unit pixel in the PAM type organic light emitting diode driving apparatus, and illustrates a method of flowing a driving current equal to a desired gray level in each frame. For example, when the display data of the gray level 3 (L3) is expressed, as much as the driving current that can represent the gray level 3 (L3) flows into each frame of the corresponding unit pixel, as shown in FIG. Of course, if the display data changes, the amount of current changes correspondingly and flows into the drive IC.

In order to express a plurality of gray scales in the organic light emitting diode driving apparatus using the PAM method, a technique of finely adjusting the amplitude of the driving current output from the drive circuit is required.

However, in the PAM method as described above, in order to express a plurality of gray scales, a technology for finely adjusting the output current of the drive circuit must be mounted. Therefore, the complexity of the drive circuit increases, and the increase in the complexity increases the circuit area. And increased power consumption and increased prices.

On the other hand, Figure 3 is a display characteristic curve exemplified to explain the gamma correction used in the conventional PWM method driving device to illustrate the case of changing the linear gamma curve 'ga' to gamma curve 'b' 4 is a luminance increase and decrease curve according to gamma correction. Referring to FIG. 3, the original luminance corresponding to the input gray level signals i1, i2, and i3 before gamma correction is A, B, and C. After the gamma correction is performed, the changed luminance should be a, b, c. In order to increase or decrease the luminance at each gray scale, luminance correction by 2/16, 3/16, and 3/16 should be performed.

As described above, in order to correct the luminance change for each grayscale, a current change must be made for each grayscale. In order to change the current, the conventional PWM method driving apparatus uses a method of changing a frequency of a constant clock signal for each grayscale.

However, in the organic light emitting diode driving apparatus using the PAM driving pulse, the circuit configuration for the above gamma correction in the drive circuit is difficult, and thus, the gamma correction technique is not practically implemented in the PAM driving apparatus at this time.

Therefore, the present invention has been made to solve the above problems, the present invention is to output the pulse of the pulse amplitude modulation method for applying the current of different gradation for each frame to display the intermediate gradation or gamma correction in the PAM method By making it possible, the microcontroller of output current is not installed in the drive circuit that outputs the PAM driving pulse, so that the drive circuit can be simplified and the power consumption can be reduced, and the cost competitiveness of the drive circuit can be enhanced. The present invention relates to a time division driving method and apparatus for a pulse amplitude modulation (PAM) type organic light emitting diode.

 One embodiment of the present invention for achieving the above object is a method of driving an organic light emitting diode or other display device using a pulse amplitude modulation (pulse amplitude modulation) driving pulse output through the drive IC, A pulse amplitude modulation (PAM) method characterized by outputting a driving pulse whose amplitude is modulated with different display gradations for each frame, and displaying an intermediate gradation between one gradation and another gradation provided by the drive IC in hardware. Provided is a time division driving method of an organic light emitting diode.

In particular, the driving method according to the embodiment of the present invention may be divided into an upper mode driving pulse amplitude modulated to have a current of higher gray level than a middle gray desired for display and a lower mode driving pulse amplitude modulated to have a current of lower gray level. It is desirable to drive.

The driving method according to the present invention alternately applies an operation mode of the driving pulse to an adjacent frame by applying an upper mode driving pulse in one frame and a lower mode driving pulse in the next frame. Another embodiment may be configured as a driving method.

In addition, the driving method according to each embodiment of the present invention, a method of applying the driving pulse of the same mode for the same row and the driving pulse of different modes according to the change of the row, the same column A method of applying a driving pulse of the same mode to a column and a driving pulse of a different mode according to the change of the column, and a method of different modes according to the change of adjacent columns and rows. Another embodiment may be configured by applying a driving pulse.

In addition, the driving method according to each embodiment of the present invention, the red (R), green (G), blue (B) method for applying the operation mode of the driving pulse for each unit pixel, respectively, red (R) In addition, it is possible to implement the method by changing the operation mode of the driving pulse for each pixel of which three unit pixels of green (G) and blue (B) form one display unit.

In addition, the time division driving apparatus of the pulse amplitude modulation type organic light emitting diode having a second drive circuit for applying an amplitude modulation driving signal to the anode of the organic light emitting diode or other display device by the driving method according to each embodiment of the present invention. Could be implemented.

The second drive circuit may include a column output circuit unit for driving pixels, and a driving pulse having a current value higher than the display gray level or a current value lower than the gray level when the gray level to be displayed is an intermediate gray level. It is preferable to include a control circuit section for outputting control signals a, b for controlling the operation of the column output circuit section respectively with a driving pulse.

These objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

In the following specification, a method of driving an organic light emitting diode will be described as an example. However, the main concept of the present invention can be applied to other display devices using a pulse amplitude modulation (PAM) driving pulse. The technical spirit of the present invention is not limited thereto, but may be variously modified and modified by those skilled in the art.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention with reference to the accompanying drawings in detail as follows.

FIG. 5 is a block diagram illustrating an internal configuration of a second drive circuit for implementing a time division driving method of a pulse amplitude modulation type organic light emitting diode according to an embodiment of the present invention, wherein the second drive circuit is connected to an anode of a display element. A drive circuit for applying a driving current of a pulse amplitude modulation method according to a display gray scale, wherein the column output circuit units 20 and 30 for driving the pixels a 23 and b 33 are respectively intermediate with the gray level to be displayed. In the case of gradation, a driving pulse having a current value higher than the display gradation (O_mode; hereinafter referred to as a high mode driving pulse) or a driving pulse having a current value of lower gradation than the display gradation (E_mode: a lower mode driving pulse And a control circuit part 40 for outputting control signals a and b for controlling the operations of the two column output circuit parts 20 and 30, respectively. Of course, in the second drive circuit according to the present invention, when the gray scale to be displayed is a gray scale that can be displayed by hardware, a normal mode driving unit for applying a driving pulse of a current value according to the gray scale desired to be displayed (not shown in the drawing). In addition, the configuration of the drive circuit is just one example, and the concept of the present invention can be implemented in various ways.

As shown in FIG. 5, the two column output circuit units 20 and 30 output current mirrors 22 and 32 for outputting a driving current according to display data to the terminal pins of the organic panel, and the control circuit unit. And a D / A converter (21) (31) for driving the output current mirrors (22) and (32), respectively, by flowing a current corresponding to the display data to the output current mirror according to the control signal generated at (40). To configure.

According to the driving method of the present invention made up of the second drive circuit having such a configuration, a gamma correction method for obtaining an intermediate gray level between different frames for each frame, or a software subdivision of each gray level for each frame, It is possible to implement each of the multi-gradation display methods that display alternately, and drive pulses having a higher mode current value higher than the intermediate gray scale to be displayed through the column output circuit unit 20 driving the pixel a 23 ( O_mode (hereinafter referred to as " O ") and a driving pulse submoded to a current value of a lower gray level than an intermediate gray level to be displayed through the column output circuit unit 30 driving the pixel b 33. E_mode (hereinafter referred to as "E"), or a method of changing the operation modes of the two column output circuit units 20 and 30. In this method, a method of controlling a higher mode control signal and a lower mode control signal through the control circuit unit 40 to appropriately combine the respective driving pulses may be used to divide and drive a higher mode in one frame. A method of changing the operation mode of the driving pulses alternately with respect to adjacent frames by applying a pulse and then applying a lower mode driving pulse in the next frame, applying a driving pulse of the same mode to the same row, and A method of applying a driving pulse of a different mode according to a change of a row, a driving pulse of the same mode for a same column, and a driving pulse of a different mode according to a change of a cloum Method, a method of applying driving pulses in different modes according to changes in adjacent columns and rows, red (R), green (G), and blue (B) A method of changing an operation mode of the driving pulse for each of the unit pixels, and an operation of the driving pulse for each pixel of which three unit pixels of red (R), green (G), and blue (B) are combined to form one display unit Any one of the methods of changing the mode may be selectively applied.

6A and 6B illustrate gamma correction by applying pulse amplitude modulation driving pulses having different gray levels to display intermediate gray scales in a time division driving method of a pulse amplitude modulation organic light emitting diode according to an exemplary embodiment of the present invention. The two methods are illustrated.

In particular, FIG. 6A illustrates an example in which one gray level unit is divided into two gray levels, and a gray level 2.5 (L2.5) may be displayed between gray level 2 (L2) and gray level 3 (L3). That is, to display 2.5 gray scales, the driving current of gray level 3, which is the upper mode driving pulse, is applied to the odd-numbered frames (frames 1, 3, 5, and 7), and the lower mode driving is performed on the even-numbered frames (frames 2, 4, 6, and 8). As a method of applying the pulsed gradation 2 driving current, the drive current amplitude-modulated to the value of gradation 3 and the driving current amplitude-modulated to the value of gradation 2 are alternately displayed to display gradation 2.5, which is an intermediate gradation between gradation 2 and gradation 3, as a pulse. The current waveform diagram of the display gradation shown by the visual waveform and the current waveform exemplarily showing the method of applying alternately to. By using such a driving method, a desired gray scale can be realized even in a pulse amplitude modulation type drive circuit, and gamma correction can be achieved using the same gray scale. That is, in the case of the i3 gradation of FIG. 3, when the 4/16 luminance level and the 2/16 luminance level are used for the same frame time, the luminance of the 3/16 level (point b) can be obtained.

In addition, FIG. 6B is an example of dividing and displaying one gray scale unit into four gray levels, and illustrates that gray level 0.25 (L0.25) may be displayed between gray level 1 (L1) and gray level 0 (L0). In other words, if this method is used, gradation 0.25 (L0.25), 0.5 (L0.5), 0.75 (L0.75) between gradation 1 (L1) and gradation 0 (L0) depending on the combination of driving pulses. You can also display more. In the drawing, the driving current of gradation 1 (L1) is applied to the first and fifth frames (frames 1 and 5) to display the gradation 0.25 (L0.25) and the other frames (frames 2, 3, 4, 6, and 7). 8 is a current waveform diagram illustrating a method of applying a driving current of gradation 0 (L0) and a current waveform diagram of a display gradation exhibited by visual effects.

Hereinafter, a method of subdividing and displaying each display gray level by software will be described.

Table 1 below illustrates data values to be displayed on the screen.

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 2.5 2 3 1.5 ... One 1.5 row 2 One 2 2.5 3 ... 2.5 One row 3 0.5 1.5 2.5 3.5 ... 4.5 5.5 row 4 1.5 1.5 1.5 1.5 ... 1.5 1.5 ... ... ... ... ... ... ... ... row n-1 2.5 2 2.5 2 ... 2.5 2 row n 2 2.5 2 2.5 ... 2 2.5

In Table 1, each column (column 1 to m) means columns of red (R), green (G), and blue (B) unit pixels, and pixels represented by integers are provided in hardware in the original drive circuit. The pixel displayed in the decimal form means a gray level between gray levels originally supported by the drive circuit. That is, gradation 2.5 means intermediate gradation between gradation 2 and gradation 3. Table 1 may implement an embodiment of the present invention in the following various cases to represent the same data.

<Example 1>

Table 2a and Table 2b, and Tables 3a and 3b below show an intermediate gray level using a high mode driving pulse and a low mode driving pulse in frame units, and a high mode driving pulse and a low mode in frame units. This is an example of using driving pulse.

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 3 2 3 2 ... One 2 row 2 One 2 3 3 ... 3 One row 3 One 2 3 4 ... 5 6 row 4 2 2 2 2 ... 2 2 ... ... ... ... ... ... ... ... row n-1 3 2 3 2 ... 3 2 row n 2 3 2 3 ... 2 3

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 O O O O ... O O row 2 O O O O ... O O row 3 O O O O ... O O row 4 O O O O ... O O ... ... ... ... ... ... ... ... row n-1 O O O O ... O O row n O O O O ... O O

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 2 2 3 One ... One One row 2 One 2 2 3 ... 2 One row 3 0 One 2 3 ... 4 5 row 4 One One One One ... One One ... ... ... ... ... ... ... ... row n-1 2 2 2 2 ... 2 2 row n 2 2 2 2 ... 2 2

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 E E E E ... E E row 2 E E E E ... E E row 3 E E E E ... E E row 4 E E E E ... E E ... ... ... ... ... ... ... ... row n-1 E E E E ... E E row n E E E E ... E E

Table 2a and Table 3a are actual display data, and Table 2b and Table 3b are pixel-specific driving modes. In one frame, all intermediate gray pixels are displayed as the upper gray level (O_mode), as in Table 2b, and in another frame. As shown in Table 3b, all intermediate grayscale pixels are displayed as the lower grayscale E_mode. In this case, the number of frames driven in the upper mode and the frames driven in the lower mode may be determined according to the gradation to be expressed. The original data is displayed for the unit pixels of normal gradation (indicated by integer) instead of intermediate gradation regardless of the upper mode or the lower mode.

<Example 2>

Table 4a and Table 4b and Tables 5a and 5b show the higher mode drive pulses on a frame basis while alternately using the high mode drive pulses and the lower mode drive pulses in a row unit within one frame. The present invention is to display an intermediate gray scale by alternately using and changing an operation mode of a lower mode driving pulse.

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 3 2 3 2 ... One 2 row 2 One 2 2 3 ... 2 One row 3 One 2 3 4 ... 5 6 row 4 One One One One ... One One ... ... ... ... ... ... ... ... row n-1 3 2 3 2 ... 3 2 row n 2 2 2 2 ... 2 2

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 O O O O ... O O row 2 E E E E ... E E row 3 O O O O ... O O row 4 E E E E ... E E ... ... ... ... ... ... ... ... row n-1 O O O O ... O O row n E E E E ... E E

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 2 2 3 One ... One One row 2 One 2 3 3 ... 3 One row 3 0 One 2 3 ... 4 5 row 4 2 2 2 2 ... 2 2 ... ... ... ... ... ... ... ... row n-1 2 2 2 2 ... 2 2 row n 2 3 2 3 ... 2 3

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 E E E E ... E E row 2 O O O O ... O O row 3 E E E E ... E E row 4 O O O O ... O O ... ... ... ... ... ... ... ... row n-1 E E E E ... E E row n O O O O ... O O

Table 4a and Table 5a are actual display data, and Table 4b and Table 5b are pixel-specific driving modes. As shown in Table 4b, the pixels of all intermediate gray levels in the first row (row 1) in one frame, as shown in Table 4b, are the upper gray level (O_mode). ), And all pixels of the middle gradation of the next row (row 2) are displayed as the lower gradation (E_mode), and the same operation (O → E driving) is repeated alternately for all the rows of the frame. In another frame that follows, the driving order is changed from E to O for all rows. That is, as shown in Table 5b, all the intermediate gray pixels of the first row (row 1) are displayed as the lower gray level (E_mode), and the pixels of all the middle gray levels of the next row (row 2) are displayed as the upper gray level (O_mode). This operation (E → O) is repeated alternately for every row of the frame. In this embodiment, it is a matter of course that a frame in which all of the lower mode and the upper mode are mixed may come according to the data to be displayed for the subsequent frame.

<Example 3>

Table 6a and Table 6b and Table 7a and Table 7b show the high mode drive pulses on a frame basis while alternately using the high mode drive pulses and the low mode drive pulses on a column basis within a frame. The present invention is to display an intermediate gray scale by alternately using and changing an operation mode of a lower mode driving pulse.

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 3 2 3 One ... One One row 2 One 2 3 3 ... 3 One row 3 One One 3 3 ... 5 5 row 4 2 One 2 One ... 2 One ... ... ... ... ... ... ... ... row n-1 3 2 3 2 ... 3 2 row n 2 2 2 2 ... 2 2

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 O E O E ... O E row 2 O E O E ... O E row 3 O E O E ... O E row 4 O E O E ... O E ... ... ... ... ... ... ... ... row n-1 O E O E ... O E row n O E O E ... O E

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 2 2 3 2 ... One 2 row 2 One 2 2 3 ... 2 One row 3 0 2 2 4 ... 4 6 row 4 One 2 One 2 ... One 2 ... ... ... ... ... ... ... ... row n-1 2 2 2 2 ... 2 2 row n 2 3 2 3 ... 2 3

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 E O E O ... E O row 2 E O E O ... E O row 3 E O E O ... E O row 4 E O E O ... E O ... ... ... ... ... ... ... ... row n-1 E O E O ... E O row n E O E O ... E O

Table 6a and Table 7a are actual display data, and Table 6b and Table 7b are pixel-specific driving modes. As shown in Table 6b, the pixels of all intermediate grays in the first column (col 1) are the upper gray level (O_mode) in one frame. ), And all pixels of the middle grayscale of the next column col 2 are displayed as the lower grayscale (E_mode), and the same operation (O → E driving) is repeated alternately for all the columns of the frame. In the other frames that follow, the drive sequence is changed from E to O for all rows. That is, as shown in Table 7b, all pixels of the middle gray level of the first column col 1 are displayed like the lower gray level E_mode, and pixels of all the middle gray levels of the next column col 2 are displayed like the upper gray level O_mode. This operation (E → O) is repeated alternately for all rows of the frame. Of course, even in the present embodiment, the frames in which the lower mode and the upper mode are mixed may come in accordance with the data to be displayed in the subsequent frames.

<Example 4>

Tables 8a and 8b and Tables 9a and 9b below distinguish between upper mode drive pulses and lower mode drive pulses in pixel units within one frame, and alternately use the high mode drive pulses in frame units. The present invention is to display an intermediate gray scale by alternately using an operation mode of a lower mode driving pulse.

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 3 2 3 One ... One One row 2 One 2 2 3 ... 2 One row 3 One One 3 3 ... 5 5 row 4 One 2 One 2 ... One 2 ... ... ... ... ... ... ... ... row n-1 3 2 3 2 ... 3 2 row n 2 3 2 3 ... 2 3

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 O E O E ... O E row 2 E O E O ... E O row 3 O E O E ... O E row 4 E O E O ... E O ... ... ... ... ... ... ... ... row n-1 O E O E ... O E row n E O E O ... E O

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 2 2 3 2 ... One 2 row 2 One 2 3 3 ... 3 One row 3 0 2 2 4 ... 4 6 row 4 2 One 2 One ... 2 One ... ... ... ... ... ... ... ... row n-1 2 2 2 2 ... 2 2 row n 2 2 2 2 ... 2 2

col 1 col 2 col 3 col 4 ... col m-1 col m row 1 E O E O ... E O row 2 O E O E ... O E row 3 E O E O ... E O row 4 O E O E ... O E ... ... ... ... ... ... ... ... row n-1 E O E O ... E O row n O E O E ... O E

Table 8a and Table 9a are actual display data, and Table 8b and Table 9b are pixel-specific driving modes. First, as shown in Table 8b, odd columns (col 2m-1) of odd rows (row 2n-1), That is, the pixels of all intermediate grays positioned at (2n-1, 2m-1) are displayed like the upper grayscale (O_mode), and all of the even columns (col 2m) of the even row (row 2n), that is, all of (2n, 2m) The pixel of the middle gray scale is displayed like the lower gray scale (E_mode), and the same operation (O → E driving) is repeatedly used for all rows and columns of the frame. In another frame that follows, the driving order is changed from E to O for all rows and columns. That is, as shown in Table 9b, all intermediate gray pixels located in the odd column col 2m-1 of the odd row row 2n-1 are displayed as the lower gray level E_mode, and the even rows of the even row row 2n are represented. Pixels of all the intermediate grays positioned at (col 2m) are displayed as the upper grayscales (O_mode), and the same operation (E → O) is alternately used for all rows and columns of the corresponding frame. Of course, even in the present embodiment, the frames in which the lower mode and the upper mode are mixed may come in accordance with the data to be displayed in the subsequent frames.

According to each of the above-described embodiments, the PAM method is performed by separately applying driving pulses having different display gradations for each frame for display of the intermediate gradations, or applying the driving pulses by appropriately combining each display gradation after software division. It is possible to implement gamma correction, which was impossible in the driving device, and also to adjust the halftone between hardware provided gray levels in the drive IC without having to fine-tune the output current in the drive circuit that outputs the PAM driving pulse. The display data can be displayed.

According to the present invention, it is possible to display intermediate gray scales by applying a driving pulse having a different display gray level for each frame or by applying a driving pulse by subdividing each display gray level by software. It has the advantage of gamma correction, and it also displays the data of the intermediate gray level between the gray levels provided by the drive IC without installing the fine adjustment technique of the output current in the drive circuit that outputs the PAM driving pulse. It is possible to not only simplify the drive circuit, but also reduce power consumption and improve price competitiveness.

Claims (10)

In a method of driving an organic light emitting diode or other display device using a pulse amplitude modulation modulation driving pulse output through the drive IC, Pulse amplitude modulation, characterized in that for outputting a driving pulse whose amplitude is modulated differently in each display gradation, and displaying an intermediate gradation between one gradation and the other gradation provided by the drive IC. PAM) time division driving method of organic light emitting diode. The method of claim 1, wherein the driving pulse, Pulse amplitude modulation (PAM) type induction is characterized in that the driving is divided into a high-mode driving pulse amplitude-modulated to have a current of the upper gradation than the intermediate gradation desired, and a lower mode drive pulse amplitude-modulated to have a current of the lower gradation. Time division driving method of light emitting diode. The method of claim 2, Pulse amplitude modulation (PAM), characterized in that the operation mode of the driving pulse is alternately applied to adjacent frames in such a manner that an upper mode driving pulse is applied in one frame and a lower mode driving pulse is applied in the next frame. ) Time division driving method of organic light emitting diode. The method of claim 2, Time-division driving of a pulse amplitude modulation (PAM) type organic light emitting diode, wherein a driving pulse of the same mode is applied to the same row, and a driving pulse of a different mode is applied according to the change of the row. Way. The method of claim 2, Time division driving of a pulse amplitude modulation (PAM) type organic light emitting diode, characterized in that a driving pulse of the same mode is applied to the same column, and a driving pulse of a different mode is applied according to the change of the cloum. Way. The method of claim 2, A time-division driving method of a pulse amplitude modulation (PAM) type organic light emitting diode, characterized in that different modes of driving pulses are applied to adjacent columns and rows. The method of claim 2, A time-division driving method of a pulse amplitude modulation (PAM) type organic light emitting diode, characterized in that for driving each of the red (R), green (G), and blue (B) by changing the operation mode of the driving pulse. The method of claim 2, The pulse amplitude modulation (PAM) method is characterized by changing the operation mode of the driving pulse for each pixel forming a display unit by combining three unit pixels of red (R), green (G), and blue (B). Time division driving method of light emitting diode. A pulse amplitude modulation method comprising a second drive circuit for outputting a drive signal of an amplitude modulation method to an anode of an organic light emitting diode or other display element by the method according to any one of claims 1 to 8. PAM) time division driving device of organic light emitting diode. The method of claim 9, wherein the second drive circuit, A column output circuit section for driving pixels a and pixel b respectively; When the gray level to be displayed is a middle gray level, a control signal for controlling the operation of the two column output circuit units, respectively, with a driving pulse having a current value higher than the display gray level or a driving pulse having a current value lower than the gray level. and a control circuit unit for outputting b, a time-division drive device for a pulse amplitude modulation (PAM) type organic light emitting diode, characterized in that it comprises a.

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