KR20180060530A - Organic light emitting diode display device and the method for driving the same - Google Patents

Abstract

Provided are an organic light emitting diode (OLED) display device and a driving method thereof. According to the present invention, the OLED display device comprises: a display panel including a plurality of pixels in which an OLED device is disposed; a data driving circuit supplying video data voltage and black gradation data voltage to the OLED device through a data line; a gate driving circuit supplying gate voltage to the OLED device through a gate line; and a timing control unit controlling an operation timing of the data and gate driving circuits, and controlling the gate voltage representing a time point, at which the black gradation voltage is supplied, based on a moving speed of an image outputted on the display panel. According to one embodiment of the present invention, the OLED display device analyzes the moving speed and adjusts the time when the black gradation voltage is inserted into a frame based on the analyzed moving speed, thus being able to suppress brightness reduction of an image outputted on the OLED display device.

Description

Technical Field [0001] The present invention relates to an organic light emitting diode (OLED) display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic light emitting display and a driving method thereof, and more particularly, to an organic light emitting display capable of improving image quality and a driving method thereof.

A flat panel display (FPD) has been employed in various electronic devices such as mobile phones, tablets, notebook computers, televisions and monitors. Recently, FPD includes a liquid crystal display (LCD) device and an organic light emitting diode (OLED) display device. Such a display device includes a pixel array including a plurality of pixels, in which an image is displayed and composed of a plurality of pixels, and a driving circuit that controls light to be transmitted or emitted in each of the plurality of pixels. The driving circuit of the display device is a data driving circuit for supplying a data signal to the data lines of the pixel array, and sequentially supplies a gate signal (or a scanning signal) synchronized with the data signal to the gate lines (or scan lines) And a timing controller for controlling the gate driver circuit (or scan driving circuit) and the data driving circuit and the gate driving circuit.

In particular, the organic light emitting display device is a self light emitting display device, and unlike a liquid crystal display device, a separate light source is not required, and thus it can be manufactured in a light and thin shape. In addition, the organic light emitting display device is not only advantageous in terms of power consumption by low voltage driving, but also has excellent hue, response speed, viewing angle, and contrast ratio (CR), and has been studied as a next generation display device in various fields. Further, since the organic light emitting element has a surface light emitting structure, it is easy to realize a flexible form.

An OLED display having the above advantages outputs an image over a plurality of frames based on an image data signal. However, when an image output over a plurality of frames is outputted only by an image data signal, a blur phenomenon may be caused in which the image is not distinguished but is attracted. Such a motion blur phenomenon can be visually recognized by the human eye, thereby reducing the image quality.

Accordingly, there is a need for an organic light emitting display device and a driving method thereof that can reduce the problems of the motion blur phenomenon.

[Related Technical Literature]

One. Organic light emitting diode display device and driving method thereof (Korean Patent Laid-Open No. 10-2012-0009887)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an organic light emitting diode (OLED) display device capable of reducing a motion blur phenomenon and suppressing luminance reduction of an output image by adjusting a duty ratio of a black gradation data voltage according to a moving speed of an image, And to provide a driving method thereof.

Another object of the present invention is to provide an organic light emitting display device and a driving method thereof, in which a BDI and a compensation algorithm can be simultaneously implemented by adding a shift register to a gate driving circuit.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an organic light emitting diode (OLED) display device including a display panel including a plurality of pixels, A gate driving circuit for supplying a gate voltage to the organic light emitting element through the gate line, and a data driving circuit for controlling the operation timing of the data driving circuit and the gate driving circuit, And a timing control section for controlling a gate voltage indicating a timing at which the black gradation data voltage is supplied based on the movement speed. The organic light emitting display according to an exemplary embodiment of the present invention analyzes the motion speed and adjusts the time at which the black gradation data voltage is inserted into the frame based on the analyzed motion speed, The reduction can be suppressed.

According to an aspect of the present invention, there is provided an organic light emitting diode (OLED) display device including a display panel including a plurality of pixels each including an organic light emitting diode A data driving circuit for supplying a voltage to the organic light emitting element, a gate driving circuit for supplying a gate voltage to the organic light emitting element through the gate line, an operation timing of the data driving circuit and the gate driving circuit, And controls the gate voltage indicating the timing at which the black gradation data voltage is supplied based on the motion speed of the image output from the display panel, and a timing control section for processing the image data supplied to the display panel, The image processing unit for supplying the image data to the timing control unit . A method of driving an organic light emitting display includes analyzing a motion of an image, calculating a motion speed of the image through motion estimation, controlling an operation timing of the data driving circuit and the gate driving circuit, And controlling a time point at which the black gradation data voltage is supplied based on a speed of the video data, wherein the video data is supplied during a plurality of frames, and the characteristic of the driving switching element driving each of the plurality of pixels between the plurality of frames is compensated There is a compensating section. A method of driving an organic light emitting diode display according to an embodiment of the present invention includes adding a shift register to a gate driving circuit, connecting a shift register for outputting a video data voltage and a shift register for sensing to an OR gate, The device's compensation algorithm and BDI can be implemented simultaneously.

The details of other embodiments are included in the detailed description and drawings.

The present invention can reduce the luminance of an image output from the organic light emitting display device by analyzing the motion speed and adjusting the time at which the black gradation data voltage is inserted into the frame based on the analyzed motion speed.

Further, in the present invention, a shift register is added to a gate driving circuit, and a shift register for outputting a video data voltage and a shift register for sensing are connected to an OR gate, so that the compensation algorithm and the BDI of the organic light emitting display can be simultaneously implemented .

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a block diagram schematically showing an organic light emitting display according to an embodiment of the present invention.
2 is a waveform diagram showing a gate voltage output from a gate driving circuit during one frame according to an embodiment of the present invention.
FIGS. 3A and 3B are exemplary waveform diagrams and graphs for explaining a method of adjusting a supply time point of a black gradation data voltage according to an embodiment of the present invention.
4 is an exemplary block diagram showing a configuration of a gate driving circuit according to another embodiment of the present invention.
FIG. 5 is an exemplary diagram illustrating a relationship between a compensation period and a black gradation data voltage supply point according to another embodiment of the present invention. Referring to FIG.
FIG. 6 is a diagram illustrating a method of shifting a black gradation data voltage supply point when a compensation period and a black gradation data voltage supply point are overlapped according to another exemplary embodiment of the present invention.
7 is an exemplary waveform diagram illustrating a method of compensating for brightness of an organic light emitting display according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

It will be understood that when an element or layer is referred to as being on another element or layer, it encompasses the case where it is directly on or intervening another element or intervening another element or element.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a display device according to an embodiment of the present invention. Referring to FIG. 1, an OLED display 100 includes a display panel 110, a gate driving circuit 120, a data driving circuit 130, a timing controller 140, and an image processor 150.

1, an organic light emitting diode display 100 includes a display panel 110 including a plurality of pixels in which organic light emitting diodes (OLEDs) are disposed, a gate electrode GL for supplying a gate voltage to the OLEDs through a gate line GL, A data driving circuit 130 for supplying a video data voltage and a black gradation data voltage to the organic light emitting element through the driving circuit 120 and the data line DL and a data driving circuit 130 for supplying the video data voltage and the black gradation data voltage to the data driving circuit 130 and the gate driving circuit 120 And a timing control section 140 for controlling the operation timing and controlling the gate voltage indicating the timing at which the black gradation data voltage is supplied based on the motion speed of the image output from the display panel 110. [ The OLED display 100 further includes an image processor 150 that receives data on an image input to the display panel 110 and converts the image data into a digital signal and supplies a video signal and a control signal to the timing controller 140, .

Each of the plurality of pixels constituting the organic light emitting display includes an organic light emitting element OLED composed of an organic light emitting layer between the anode and the cathode and a pixel driving circuit 111 driving the organic light emitting element OLED independently .

Referring to FIG. 1, the display panel 110 includes a plurality of pixels, and each of the plurality of pixels includes a pixel driving circuit 111 for driving the organic light emitting diode OLED. Specifically, the pixel driving circuit 111 includes a driving switching element DT electrically connected to the organic light emitting element OLED and electrically connected between the high potential supply line EVDD and the low potential supply line EVSS, A scan switching element S1 connected to the gate of the driving switching element DT, a sensing switching element S2 connected to the source of the driving switching element DT and a gate of the driving switching element DT, And a storage capacitor Cstg connected between the sources of the transistors Q1, Q2, Q3, and Q4. Here, the scan switching element S1 charges the data voltage in the storage capacitor Cstg in response to the scan pulse SCAN, and the drive switching element DT charges the storage capacitor Cstg according to the data voltage charged in the storage capacitor Cstg. And controls the amount of current supplied to the OLED to control the amount of light emitted from the OLED.

1, the display panel 110 of the OLED display 100 includes a plurality of blocks BL1 to BL5, and each of the plurality of blocks BL1 to BL5 includes a predetermined number of consecutive adjacent Gate lines. Specifically, each of the plurality of blocks BL1 to BL5 may include a gate line in a multiple of 8. For example, each of the plurality of blocks BL1 to BL5 may include 16 gate lines. However, the number of gate lines included in each of the plurality of blocks BL1 to BL5 may be variously changed according to the embodiment. In addition, although the number of the plurality of blocks BL1 to BL5 is shown as five for convenience of explanation, the number of the plurality of blocks may be changed according to the embodiment.

In FIG. 1, the modules constituting the organic light emitting diode display 100 are exemplary and are conveniently classified according to functions. The number of modules constituting the organic light emitting diode display 100 may be variously changed according to the number of modules constituting the OLED display 100. For example, . 1, the image processing unit 150 is represented as a separate module from the timing control unit 140. However, one module may include both the timing control unit 140 and the image processing unit 150, The timing control unit 140 and the image processing unit 150 may operate simultaneously in the module.

The gate driving circuit 120 supplies a gate signal to the gate line GL in accordance with the gate control signal GCS supplied from the timing control unit 140. [ Here, when the OLED display 100 is an OLED, the gate signal may include at least one scan signal and a light emission control signal. Although the gate drive circuit 120 is shown as being disposed on one side of the display panel 110 in FIG. 1, the number and arrangement of the gate drive circuits 120 are not limited thereto. That is, the gate driving circuit 120 may be disposed on one side or both sides of the display panel 110 in a GIP (Gate In Panel) manner.

The data driving circuit 130 converts the image data RGB into data voltages according to the data control signal DCS supplied from the timing controller 140 and supplies the converted data voltages to the pixels through the data lines DL do.

The timing controller 140 controls the timing of the driving signals input to the display panel 110. The timing controller 140 processes the image data RGB input from the image processor 150 in accordance with the size and the resolution of the display panel 110 and supplies the image data RGB to the data driving circuit 130. The timing controller 140 receives the timing control signals SYNC, for example, a dot clock signal, a data enable signal, a horizontal synchronization signal, a vertical synchronization signal Vsync, To generate a plurality of gate and data control signals (GCS, DCS). And controls the gate driving circuit 120 and the data driving circuit 130 by supplying the generated gate and data control signals GCS and DCS to the gate driving circuit 120 and the data driving circuit 130, respectively.

The image processor 150 is connected to a timing controller 140 for controlling the timing of the driving signals input to the display panel 110. The image processor 150 supplies the image data RGB and the timing control signal to the timing controller 140. Accordingly, the image processing unit 150 can process the image data supplied to the display panel 110. [

In addition, the image processing unit 150 includes a module capable of performing Frame Rate Up Conversion (hereinafter referred to as FRUC) so as to improve compatibility between image media and output images more smoothly. Here, FRUC is a technique for increasing the frame rate of an input image by inserting an interpolation image between frames of the input image. FRUC is divided into blocks each having a predetermined size, and the most similar blocks among the adjacent frames are found based on the divided blocks, so that motion between frames can be estimated and a motion vector can be determined. In this way, ME (Motion Estimation) is used to derive motion vectors on a block-by-block basis by matching corresponding blocks between adjacent frames. Accordingly, the image processing unit 150 can analyze the motion speed of the image through motion estimation (ME).

Further, the image processor 150 may control the timing of supplying the black gradation data voltage based on the motion speed of the analyzed image. In addition, the image processing unit 150 can compensate the luminance and luminance deviation so as to suppress the luminance of the image outputted by the display panel 110 from being lowered as the black gradation data voltage is supplied.

A specific method of controlling the timing at which the image processing unit 150 supplies the black gradation data voltage and compensating for the luminance will be described later with reference to Figs. 2 to 7. Fig.

The organic light emitting diode display 100 according to an embodiment of the present invention analyzes the motion speed of an image output from the display panel 110 through motion estimation and generates a black gradation data voltage based on the motion speed of the image And an image processing unit 150 for controlling the viewpoint and compensating for luminance and luminance variations of the image output from the display panel 110. [ Accordingly, the organic light emitting diode display 100 can variably implement black data insertion (BDI) according to the moving speed of the image, and by implementing the BDI variably according to the moving speed of the image, It is possible to suppress a decrease in luminance of an image output by the image output unit 110. [ Further, the organic light emitting diode display 100 compensates for the luminance deviation of the image output from the display panel 110, thereby realizing the BDI and further suppressing the brightness drop of the output image. Accordingly, the organic light emitting diode display 100 can improve the image quality and brightness of the image output through the display panel 110.

2 is a waveform diagram showing a gate voltage output from a gate driving circuit during one frame according to an embodiment of the present invention. For convenience of description, FIG. 1 will be described below together.

Referring to FIG. 2, one frame includes an image data voltage supply period, and may include at least a portion of a black gradation data voltage supply period. Also, the video data voltage supply interval in one block BL1 may gradually decrease during one frame, while the black gradation data voltage supply interval may be maintained constant.

The image processing unit 150 may control the video data voltage supply period and the black gradation data voltage supply period in one block BL1. Specifically, the image processor 150 may transmit the gate control signal GCS to the gate driving circuit 120 through the timing controller 140 so that the image data voltage supply time is shifted. Similarly, the image processing unit 150 may transmit the gate control signal GCS to the gate driving circuit 120 through the timing control unit 140 so that the black gradation data voltage supply point in one block BL1 coincides. Here, the black gradation data voltage supply time point may be different for each of the plurality of blocks BL1 to BL5, and may be shifted toward the lower block.

Further, the image processing unit 150 can control the supply timing of the black gradation data voltages in each of the plurality of blocks BL1 to BL5. A specific method for controlling the image processing unit 150 to supply the black gradation data voltage will be described later with reference to FIGS. 3A and 3B.

The OLED display 100 according to an embodiment of the present invention includes an image processing unit 150 for controlling a black gradation data voltage supply period during one frame. Accordingly, the image processing unit 150 can equally equip the black gradation data voltage supply points in each of the plurality of blocks BL1 to BL5. Also, the image processing unit 150 may control the timing control unit 140 to have different black gradation data voltage supply points for the plurality of blocks BL1 to BL5. Accordingly, by controlling the black gradation data voltage supply period by the image processing unit 150, it is possible to increase or decrease the black gradation data voltage supply period in one frame.

FIGS. 3A and 3B are exemplary waveform diagrams and graphs for explaining a method of adjusting a supply time point of a black gradation data voltage according to an embodiment of the present invention. For convenience of description, FIG. 1 and FIG. 2 together will be described later.

Referring to FIG. 3A, the image processing unit 150 may control the supply of the black gradation data voltage during one frame. That is, the image processing unit 150 can control the timing of supplying the black gradation data voltage based on the motion speed of the image analyzed through the motion estimation.

More specifically, when the motion speed of the image is fast, the image processing unit 150 can adjust the timing of supplying the black gradation data voltage to a point earlier than one frame. Conversely, when the moving speed of the image is slow, the image processing unit 150 can adjust the timing at which the black gradation data voltage is supplied to a time point that is slower than one frame. That is, as the motion speed of the image increases, the timing of supplying the black gradation data voltage increases, and as the movement speed of the image decreases, the timing of supplying the black gradation data voltage becomes slower.

Accordingly, when the moving speed of the image is high, the interval in which the black gradation data voltage is supplied in one frame increases, and the duty ratio of the interval in which the black gradation data voltage is supplied in one frame increases. Conversely, when the moving speed of the image is slow, the interval in which the black gradation data voltage is supplied in one frame decreases and the duty ratio of the interval in which the black gradation data voltage is supplied in one frame also decreases.

Referring to FIG. 3B, it may be limited to adjust the timing at which the black gradation data voltage is supplied according to the moving speed of the image. Specifically, when the moving speed of the image is smaller than the first threshold value, the supply timing of the black gradation data voltage may be determined as the minimum supply timing. When the moving speed of the image is greater than the second threshold value, Can be determined as the maximum supply time. If the motion speed of the image is greater than the second threshold value, the image processor 150 controls to supply only the image data voltage through the data line when the motion speed of the image is smaller than the first threshold value. It is possible to control the black gradation data voltage to be supplied through the data line at the maximum supply time of the voltage.

Here, the minimum supply time and the maximum supply time may be variously determined according to the embodiment. The minimum supply time point may mean that there is no time point at which the black gradation data voltage is supplied in one frame so that the black gradation data voltage is not supplied. The maximum supply timing may be determined after the minimum video data voltage supply interval required for the video data voltage to be properly output from the display panel 110 to the video. For example, when the moving speed of the image is smaller than the first threshold value, the timing at which the black gradation data voltage is supplied may be adjusted such that the black gradation data voltage is not supplied. Also, when the moving speed of the image is larger than the second threshold value, the image data voltage is outputted from the display panel 110 to the image, so that the supply timing can be adjusted so that the black gradation data voltage can be supplied at the maximum.

Further, under the control of the image processing unit 150, the gate driving circuit 120 can supply the gate voltage so that the timing at which the black gradation data voltage is supplied at a predetermined number of gate lines is the same. The time point at which the black gradation data voltage is supplied may be varied based on the motion speed of the image.

Accordingly, the image processing unit 150 controls the timing at which the black gradation data voltage is supplied according to the moving speed of the image, so that the image is outputted to the extent that the image can be recognized by a person through the display panel 110, The decrease in luminance can be minimized. That is, the upper and lower limits are set at the time when the black gradation voltage controlled by the image processing unit 150 is supplied to cause motion blur due to supply of excessive image data voltage, or significant luminance decrease occurs due to supply of excessive black gradation data voltage Can be prevented.

The OLED display 100 according to an exemplary embodiment of the present invention includes an image processor 150 that analyzes a motion speed of an image and controls a timing of supplying a black gradation data voltage based on the analyzed motion speed It is possible to suppress motion blur in an image output through the image processing apparatus. That is, the image processor 150 controls the timing at which the black gradation data voltage is supplied according to the moving speed of the image, thereby preventing abrupt change in brightness and efficiently reducing the motion blur in consideration of the maximum luminance and the minimum luminance of the image . Accordingly, in the organic light emitting diode display 100, image quality can be improved by reducing motion blur.

4 is an exemplary block diagram showing a configuration of a gate driving circuit according to another embodiment of the present invention. For convenience of description, FIG. 1 will be described below together.

4, the gate driving circuit 120 includes a first shift register 121, a second shift register 122, a third shift register 123, an OR gate 124, a level shifter 125, Buffer 126. < / RTI >

Specifically, the gate driving circuit 120 includes a first shift register 121 for outputting a gate voltage for providing a time point at which a video data voltage is output, a gate driver 120 for outputting a gate voltage for controlling the operation timing of the sensing switching element during a compensation period A third shift register 123 for outputting a gate voltage for providing a time point at which the black gradation data voltage is supplied, an output of the first shift register 121, an output of the second shift register 122, An AND gate 124 for calculating the logical sum of the output of the first shift register 123 and the output of the third shift register 123, and a level shifter 125.

The first shift register 121, the second shift register 122 and the third shift register 123 are connected to the input of the OR gate 124 and the level shifter 125 is connected to the output of the OR gate 124 Lt; / RTI > The output buffer 126 supplies the output of the level shifter 125 to the display panel 110. That is, the output of the output buffer 126 may be a gate signal.

4, the OR gate 124 outputs one of the output of the first shift register 121, the output of the second shift register 122, and the output of the third shift register 123 to the level shifter 125). That is, the OR gate 124 may output different gate signals during the video data voltage supply period, the black gradation data voltage supply period, and the compensation period. Specifically, the output of the first shift register 121 may output a gate signal for controlling the pixel driving circuit 111 through the OR gate 124 so as to output an image during a period in which the video data voltage is supplied . The output of the second shift register 122 may output the gate signal through the OR gate 124 so as to control the scan switching element S1 and the sensing switching element S2 for external compensation during the compensation period. The output of the third shift register 123 may output a gate signal through the OR gate 124 so that the black gradation data voltage may be supplied during the period during which the image data voltage is supplied and during the remaining period except for the compensation period. Here, the gate signal may be a gate driver control signal GDC, and a gate shift clock (GSC), a gate start pulse (GSP), and a gate output enable (GOE) .

Thus, the OR gate 124 outputs the output of the first shift register 121, the output of the second shift register 122, and the output of the third shift register 123 as a logical sum, It is possible to supply another gate signal to the organic light emitting element of the display panel 110. [ Therefore, the OLED display 100 further includes a third shift register 123 for supplying the black gradation data voltage, but the conventional gate line GL can be used as it is. Accordingly, it is possible to output different gate signals during the video data voltage supply period, the black gradation data voltage supply period and the compensation period through the same gate line GL without adding the gate line GL.

Further, by outputting the output of the first shift register 121, the output of the second shift register 122, and the output of the third shift register 123 as a logical sum, the OR gate 124 outputs the output of the sensing switching element S2) is implemented, and only the scan switching element S1 is used during a period in which the black gradation data voltage is supplied. Accordingly, a gate signal for controlling the timing at which the black gradation data voltage is supplied without being overlapped with the compensation algorithm during the period in which the black gradation data voltage is supplied can be supplied to the organic light emitting element OLED.

FIG. 5 is an exemplary diagram illustrating a relationship between a compensation period and a black gradation data voltage supply point according to another embodiment of the present invention. Referring to FIG. FIG. 6 is a diagram illustrating a method of shifting a black gradation data voltage supply point when a compensation period and a black gradation data voltage supply point are overlapped according to another exemplary embodiment of the present invention. For convenience of description, FIG. 1 and FIG. 4 will be described below together.

Referring to FIG. 5, image data is output during a plurality of frames, and a compensation interval for compensating the characteristics of the driving switching device DT exists between each of the plurality of frames. 5, each of the data signal supply frames 501 to 504 includes a video data voltage supply interval and a black gradation data supply interval. The n-th output frame (N frame) and the (n-1) There is a compensation interval between the output frame (N-1 frame).

Referring to FIG. 5, the BDI 520 is shifted and supplied for each block of the display panel 110 in each of the data signal supply frames 501 to 504. The output frame and the compensation period are a predetermined time interval, and the timing of the BDI 520 is determined by the image processing unit 150. [ Accordingly, the BDI 520 may be supplied before the compensation period, overlapped with the compensation period, or supplied after the compensation period. Here, the BDI that is supplied in a superimposed manner within the compensation period may be referred to as an overlapped BDI 521. [

First, the image processor 150 may determine whether the time at which the black gradation data voltage is supplied is within the compensation period. Specifically, the image processing unit 150 calculates the timing at which the black gradation data voltage is supplied, compares the information on the compensation period with the timing at which the black gradation data voltage is supplied, and determines whether the BDI 520 is within the compensation period Can be determined.

Referring to FIG. 5, in the first case 511 in which the BDI 520 is supplied before the compensation period, the black gradation data voltage may be continuously supplied after the compensation period. In the third case 513 in which the BDI 520 is supplied after the compensation period, a video data voltage is supplied after the compensation period, and a black gradation data voltage is supplied from the time when the black gradation data voltage determined by the image processing unit 150 is supplied. A data voltage can be supplied.

5, the overlapped BDI 521 may be shifted to the outside of the compensation interval by the image processor 150 in the second case 512 in which the overlapped BDI 521 is overlapped within the compensation interval. That is, the image processing unit 150 can change the timing at which the black gradation data voltage is supplied so that the compensation period does not overlap with the time when the black gradation data voltage is supplied.

Specifically, when the time at which the black gradation data voltage is supplied is within the compensation period, the image processing unit 150 sets the time point at which the black gradation data voltage is supplied among the frames adjacent to the start point of the compensation period and the end point of the compensation period, The time point at which the black gradation data voltage is supplied to the adjacent frame can be shifted. For example, when the time when the black gradation data voltage is supplied is within the compensation period, the image processing unit 150 controls the gate start pulse (GSP) signal to move the overlapping BDI 521 to the adjacent frame.

Referring to FIGS. 5 and 6, when the BDI 520 is 16H (Horizontal Time) and the compensation period is 90H, the overlap BDI 521 may occur in five cases during the compensation period.

For example, since the first overlapping BDI 521a overlaps at the center of the compensation section, the start and end points of the compensation section are separated by 32H, respectively. Accordingly, the image processing unit 150 can move the first overlapping BDI 521a to one of the frames adjacent to the start or end point of the compensation period. Likewise, the second overlapping BDI 521b is spaced apart from the end point of the compensation section in the compensation section, is spaced apart by 48H from the beginning of the compensation section, and is spaced apart by 16H to the end of the compensation section. Accordingly, the image processing unit 150 can move the second overlapping BDI 521b to a frame adjacent to the end point of the compensation section.

The organic light emitting diode display according to another embodiment of the present invention includes an image processing unit 150 capable of shifting a period during which the black gradation voltage is supplied so that the period does not overlap the compensation period. The image processing unit 150 can calculate in advance whether or not the interval in which the black gradation voltage is supplied and the compensation interval overlap each other. If the interval in which the black gradation voltage is supplied overlaps the compensation interval, the BDI does not collide with the compensation algorithm The BDI can be moved to a frame adjacent to the compensation section. Accordingly, the organic light emitting display device can be used by the image processing unit 150 without overlapping the BDI and the compensation algorithm. The avoidance design between the BDI and the compensation algorithm can be realized only by the control of the image processing unit 150 without adding a separate configuration in the pixel driving circuit 111 or the OLED display.

7 is an exemplary waveform diagram illustrating a method of compensating for brightness of an organic light emitting display according to another embodiment of the present invention. For convenience of description, FIG. 1 will be described below together.

The image processing unit 150 can compensate the brightness of the entire display panel 110. [ Specifically, the image processor 150 sets the representative luminance of the image output from the display panel 110 before the black gradation data voltage is supplied to the duty ratio of the interval during which the image data voltage of one frame is supplied It is possible to compensate the brightness of the entire display panel 110 by using the divided values. For example, when the representative luminance of the image output from the display panel 110 is 400 nits and the duty ratio of the interval in which the image data voltage is supplied in one frame is 1/2, the image processing unit 150 outputs the representative luminance of 400 nit The luminance of the entire display panel 110 can be compensated by providing the image data to the display panel 110 so that * 2 = 800 nit. However, the luminance of the entire display panel 110, which is compensated by the image processor 150, can not be greater than a value obtained by dividing the maximum luminance of the image by the duty ratio of the section in which the image data voltage is supplied. That is, the value obtained by dividing the maximum brightness of the image by the duty ratio of the interval in which the image data voltage is supplied may be an upper limit value at which the image processing unit 150 can compensate the brightness of the entire display panel 110. [ Here, the representative luminance of the image means a value representative of the luminance of the image output to the display panel 110 in one frame. For example, the representative luminance of an image may be an average value, a median value, a maximum value, or a representative value that can be determined by various methods in one frame.

The image processing unit 150 can compensate for the luminance deviation in each of the plurality of blocks BL1 to BL5. The image processing unit 150 can compensate for the luminance deviation in each of the plurality of blocks with reference to the gate line that outputs the lowest luminance among the predetermined number of gate lines in each of the plurality of blocks BL1 to BL5.

7, the gate voltages G0 to G15 are supplied to the gate lines in the first block BL1 and the video data voltages are applied to the gate voltages G0 to G15 toward the bottom of the first block BL1. The timing of feeding is shifted. Thus, even within one first block BL1, a deviation occurs in the luminance actually output in accordance with the duty ratio of the section in which the image data voltage is supplied. That is, as the duty ratio of the section in which the image data voltage is supplied becomes smaller as it goes to the lower part of the first block BL1, the luminance actually outputted gradually decreases.

For example, in the first block BL1, the luminance of the image actually output in the gate line to which the first gate voltage G0 is supplied is 500nit, and the second gate voltage G1 is actually output in the gate line to which the second gate voltage G1 is supplied The luminance of the image is 499nit and the luminance of the image actually output decreases toward the bottom of the first block BL1 so that the luminance of the image actually output from the gate line to which the fifteenth gate voltage G14 is supplied is 486nit, The brightness of the image actually output from the gate line to which the sixteenth gate voltage G15 is supplied may be 485 nit.

In order to compensate for the luminance variation occurring in the first block BL1, the image processing unit 150 includes a gate line BL1 for outputting the highest luminance to the gate line for outputting the lowest luminance in the first block BL1, The luminance value of the line is supplied. Conversely, the image processor 150 supplies the luminance value of the gate line that outputs the lowest luminance to the gate line that outputs the highest luminance in the first block BL1. Similarly, the image processing unit 150 supplies the luminance value of the gate line that outputs the second highest luminance to the gate line that outputs the second lowest luminance in the first block BL1, and supplies the luminance value of the second gate line And supplies the luminance value.

For example, the image processor 150 supplies the highest luminance of 500 nits to the gate line supplied with the sixteenth gate voltage G15 that outputs the lowest luminance of 485 nits in the first block BL1, 499 nit is supplied to the gate line to which the fifteenth gate voltage G14 to be supplied is supplied and 486 nit is supplied to the gate line to which the second gate voltage G1 which outputs 499 nit in the same manner is supplied, And supplies 485 nit to the gate line to which one gate voltage (G0) is supplied.

The organic light emitting display according to another embodiment of the present invention includes an image processing unit 150 that can compensate the brightness of the entire display panel 110. [ In addition, the image processor 150 may compensate for variations in luminance that may occur in each of the divided blocks to supply the black gradation data voltage in the display panel 110. [ As the brightness decreases due to the supply of the black gradation data voltage in the organic light emitting diode display and the luminance variation that may occur in each gate line in one block is compensated, the decrease in luminance is suppressed even if the black gradation data voltage is supplied, The occurrence of a deviation can be also reduced. In this manner, the black gradation data voltage is supplied to reduce the motion blurring phenomenon, and at the same time, the lowering of the luminance can be suppressed and the image quality of the organic light emitting display device can be remarkably improved.

The organic light emitting display according to embodiments of the present invention and the driving method thereof can be described as follows.

The organic light emitting display according to an exemplary embodiment of the present invention includes a display panel including a plurality of pixels in which organic light emitting diodes (OLEDs) are disposed, a data driving circuit for supplying image data voltages and black gradation data voltages to the organic light emitting diodes The gate driving circuit for supplying the gate voltage to the organic light emitting element through the gate line and the operation timings of the data driving circuit and the gate driving circuit are controlled to control the operation timing of the black gradation data voltage And a timing control unit for controlling a gate voltage indicating a timing of supplying the gate voltage. The organic light emitting display according to an exemplary embodiment of the present invention analyzes the motion speed and adjusts the time at which the black gradation data voltage is inserted into the frame based on the analyzed motion speed, The reduction can be suppressed.

According to another aspect of the present invention, an organic light emitting display device further includes an image processing unit for processing image data supplied to the display panel. The image processing unit analyzes the motion speed of the image through motion estimation (Motion Estimation) It is possible to control the timing at which the black gradation data voltage is supplied based on the movement speed of the black gradation data voltage.

According to another aspect of the present invention, an image processing unit controls to supply only a video data voltage through a data line when a moving speed of the video is lower than a first threshold value, , It is possible to control to supply the black gradation data voltage through the data line at the maximum supply timing of the black gradation data voltage.

According to another aspect of the present invention, the display panel includes a plurality of blocks, and each of the plurality of blocks may include a predetermined number of gate lines adjacent in succession.

According to another aspect of the present invention, a gate driving circuit supplies a gate voltage such that a time point at which a black gradation data voltage is supplied at a predetermined number of gate lines is the same, And can be varied based on speed.

According to another aspect of the present invention, as the motion speed of the image increases, the timing of supplying the black gradation data voltage increases, and as the movement speed of the image decreases, the timing of supplying the black gradation data voltage may be slower.

According to still another aspect of the present invention, the image processing unit calculates the average brightness of the display panel by using a value obtained by dividing the representative luminance of the image output from the display panel by the duty ratio of the interval in which the image data voltage is supplied in one frame, The entire brightness can be compensated.

According to still another aspect of the present invention, the image processing section can compensate for the luminance deviation in each of the plurality of blocks based on the gate line outputting the lowest luminance among the predetermined number of gate lines.

According to another aspect of the present invention, each of the plurality of pixels includes a pixel driving circuit for driving the organic light emitting element, and the pixel driving circuit is electrically connected to the organic light emitting element, and the high potential supply line and the low potential voltage A scan switching element coupled to the gate of the drive switching element, a sensing switching element coupled to the source of the drive switching element, and a storage capacitor coupled between the gate of the drive switching element and the source of the drive switching element. The image data is output during a plurality of frames, and a compensation period for compensating the characteristics of the driving switching elements exists between each of the plurality of frames. The image processing unit prevents the black gradation data voltage from being supplied during the compensation period The gate drive circuit can be controlled.

According to another aspect of the present invention, a gate driving circuit includes a first shift register for outputting a gate voltage for providing a time point at which a video data voltage is output, a gate voltage for controlling an operation timing of the sensing switching element during a compensation period, A third shift register for outputting a gate voltage for supplying a time point at which the black gradation data voltage is supplied, a second shift register for outputting the output of the first shift register, an output of the second shift register, And a level shifter, wherein the first shift register, the second shift register, and the third shift register are connected to the input of the OR gate, and the level shifter can be connected to the output of the OR gate.

According to another aspect of the present invention, the image processing unit determines whether or not the time when the black gradation data voltage is supplied is within the compensation period, and when the time when the black gradation data voltage is supplied is within the compensation period, It is possible to shift the timing at which the black gradation data voltage is supplied to the frame adjacent to the timing at which the black gradation data voltage is supplied among the frames adjacent to the end point of the adjacent frame and the compensation section.

An OLED display according to an exemplary embodiment of the present invention includes a display panel including a plurality of pixels in which organic light emitting diodes are disposed, data for supplying image data voltages and black gradation data voltages to OLEDs through data lines, A driving circuit, a gate driving circuit for supplying a gate voltage to the organic light emitting element through the gate line, an operation timing of the data driving circuit and the gate driving circuit, an operation timing of the data driving circuit and the gate driving circuit, A timing control unit for controlling a gate voltage indicating a timing at which a black gradation data voltage is supplied based on a moving speed of an image output from the timing control unit and a timing control unit for processing the image data supplied to the display panel and supplying the processed image data to the timing control unit And an image processing unit. A method of driving an organic light emitting display includes the steps of analyzing motion of an image, calculating a motion speed of the image through motion estimation, and controlling an operation timing of the data driving circuit and the gate driving circuit, Wherein the image data is supplied during a plurality of frames and a compensation period for compensating the characteristics of the driving switching elements for driving each of the plurality of pixels is provided between the plurality of frames, exist. A method of driving an organic light emitting diode display according to an embodiment of the present invention includes adding a shift register to a gate driving circuit, connecting a shift register for outputting a video data voltage and a shift register for sensing to an OR gate, The device's compensation algorithm and BDI can be implemented simultaneously.

According to another aspect of the present invention, a method of driving an organic light emitting display may further include changing a time point at which a black gradation data voltage is supplied so that a compensation period is not overlapped with a time when a black gradation data voltage is supplied.

According to another aspect of the present invention, a method of driving an organic light emitting display may further include compensating a brightness of the entire display panel.

According to another aspect of the present invention, a display panel includes a plurality of blocks, each of the plurality of blocks includes a predetermined number of consecutive adjacent gate lines, And compensating for the luminance deviation in each of the plurality of blocks based on the gate line outputting the lowest luminance among the gate lines.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: organic light emitting display
110: Display panel
111: Pixel driving circuit
120: Gate drive circuit
121: first shift register
122: second shift register
123: 3rd shift register
124:
125: Level shifter
126: Output buffer
130: Data driving circuit
140:
150:
511: First case
512: second case
513: Third case
520: BDI
521: Overlapping BDI

Claims (15)

A display panel including a plurality of pixels each of which is provided with an organic light emitting element;
A data driving circuit for supplying a video data voltage and a black gradation data voltage to the organic light emitting element through a data line;
A gate driving circuit for supplying a gate voltage to the organic light emitting element through a gate line; And
And a timing control section for controlling the operation timing of the data driving circuit and the gate driving circuit and controlling the gate voltage indicating the timing at which the black gradation data voltage is supplied based on the moving speed of the image output from the display panel And the organic light emitting display device. The method according to claim 1,
Further comprising a video processing unit for processing video data supplied to the display panel,
Wherein the image processor analyzes the motion speed of the image through motion estimation and controls a point of time when the black gradation data voltage is supplied based on the motion speed of the image. 3. The method of claim 2,
Wherein the image processing unit comprises:
When the moving speed of the image is smaller than a first threshold value, controlling to supply only the image data voltage through the data line,
And supplies the black gradation data voltage through the data line at a maximum supply timing of the black gradation data voltage when the moving speed of the image is larger than a second threshold value. 3. The method of claim 2,
Wherein the display panel includes a plurality of blocks,
Wherein each of the plurality of blocks includes a predetermined number of gate lines that are consecutively adjacent to each other. 5. The method of claim 4,
Wherein the gate driving circuit supplies the gate voltage so that the timing at which the black gradation data voltage is supplied at the predetermined number of gate lines is the same,
Wherein a time point at which the black gradation data voltage is supplied is varied based on a moving speed of the image. 6. The method of claim 5,
As the motion speed of the image increases, the timing of supplying the black gradation data voltage becomes faster,
Wherein a time point at which the black gradation data voltage is supplied is slowed down as the moving speed of the image is decreased. 5. The method of claim 4,
Wherein the image processing unit comprises:
Wherein the brightness of the entire display panel is compensated by using a value obtained by dividing a representative luminance of an image output from the display panel by a duty ratio of a section of the frame during which the image data voltage is supplied, Device. 5. The method of claim 4,
Wherein the image processing unit comprises:
And compensates a luminance deviation in each of the plurality of blocks based on a gate line outputting the lowest luminance among the predetermined number of gate lines. The method according to claim 1,
Wherein each of the plurality of pixels includes a pixel driving circuit for driving the organic light emitting element,
The pixel driving circuit comprising:
A driving switching element electrically connected to the organic light emitting element and electrically connected between the high potential supply line and the low potential supply line;
A scan switching element connected to a gate of the drive switching element;
A sensing switching element connected to a source of the driving switching element; And
A storage capacitor connected between a gate of the drive switching element and a source of the drive switching element,
The image data is output for a plurality of frames,
A compensating period for compensating a characteristic of the driving switching element exists between each of the plurality of frames,
Wherein the image processing unit controls the gate driving circuit to prevent the black gradation data voltage from being supplied during the compensation period. 10. The method of claim 9,
The gate drive circuit includes:
A first shift register for outputting a gate voltage for providing a time point at which the image data voltage is output;
A second shift register for outputting a gate voltage for controlling the operation timing of the sensing switching element during the compensation period;
A third shift register for outputting a gate voltage for providing a time point at which the black gradation data voltage is supplied;
An OR gate for calculating a logical sum of an output of the first shift register, an output of the second shift register, and an output of the third shift register; And
A level shifter,
Wherein the first shift register, the second shift register and the third shift register are connected to an input of an OR gate, and the level shifter is connected to an output of the OR gate. 10. The method of claim 9,
Wherein the image processing unit comprises:
Whether the time at which the black gradation data voltage is supplied is within the compensation period,
Wherein the timing of supplying the black gradation data voltage is within the compensation period, the frame adjacent to the start timing of the compensation period and the frame adjacent to the end timing of the compensation period, And shifts the timing at which the black gradation data voltage is supplied. A data driving circuit for supplying a video data voltage and a black gradation data voltage to the organic light emitting element through a data line, a data driving circuit for supplying a gate voltage to the organic light emitting element through the gate line, A gate driving circuit for supplying a driving signal to the device, an operation timing of the data driving circuit and the gate driving circuit, and controlling an operation timing of the data driving circuit and the gate driving circuit, And a timing controller for controlling the gate voltage indicating a timing at which the black gradation data voltage is supplied based on the image data supplied to the display panel and a timing controller for processing the image data supplied to the display panel and supplying the processed image data to the timing controller The organic light emitting display device As such method,
Analyzing the motion of the image and calculating a motion velocity of the image through motion estimation; And
Controlling the operation timing of the data driving circuit and the gate driving circuit and controlling the timing of supplying the black gradation data voltage based on the moving speed of the image,
Wherein the image data is supplied for a plurality of frames,
Wherein a compensation period for compensating a characteristic of a drive switching element driving each of the plurality of pixels is present between each of the plurality of frames. 13. The method of claim 12,
Further comprising changing a time point at which the black gradation data voltage is supplied so that the compensation period does not overlap the time when the black gradation data voltage is supplied. 13. The method of claim 12,
Further comprising the step of compensating the luminance of the entire display panel. 13. The method of claim 12,
Wherein the display panel includes a plurality of blocks, each of the plurality of blocks including a predetermined number of gate lines adjacent in succession,
And compensating a luminance deviation in each of the plurality of blocks based on a gate line outputting the lowest luminance among the predetermined number of gate lines.

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