KR102473219B1 - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device capable of removing a dimming phenomenon caused by black data insertion, comprising: a pixel unit in which a plurality of pixels are formed by crossing a plurality of gate lines and a plurality of data lines; a gate driver driving the plurality of gate lines; a data driver driving the plurality of data lines; a black data insertion unit providing black data inserted between periods in which the data signals output from the data driver are applied to the pixel unit; and a timing control unit configured to control a driving clock of the gate driver that determines a time at which the black data output through the black data inserting unit is applied to eliminate a dimming phenomenon that may occur due to simultaneously inserting black data in units of n lines. made including

Description

Organic light emitting display device

The present invention relates to an organic light emitting display device, and relates to an organic light emitting display device capable of removing a horizontal dimming phenomenon caused by black data insertion.

Recently, various flat panel display devices capable of reducing the weight and volume, which are disadvantages of cathode ray tubes, are being developed. Examples of the flat panel display include a liquid crystal display, a field emission display, a plasma display panel, and an organic light emitting display. In particular, an organic light emitting display device displays an image using an organic light emitting diode that generates light by recombination of electrons and holes. Such an organic light emitting display has the advantage of having a fast response speed and being driven with low power consumption.

Since the organic light emitting display device is driven in a hold type, temporal frequency characteristics of light displaying moving images are low, and spatial frequency characteristics are lowered accordingly, resulting in blurring of moving images.

This is due to the integration effect of the temporarily lasting image in the eye that follows the movement. Due to the characteristics of the hold-type method, the organic light emitting display device causes a discrepancy between the movement of the eye and the static image of each frame. sees a blurry screen. That is, the hold-type organic light emitting display device has a disadvantage in that the MPRT index is lower than that of the impulse-type CRT.

In order to overcome this disadvantage, after displaying each image in one frame, black data is inserted before the image of the next frame is displayed, so that the entire screen is converted to a black display, "Black Insertion" method has been studied. .

However, in the conventional case, a new driving circuit or a new driving method has been researched to generate such black data and provide it to the pixel unit, but in this case, problems such as complexity of the circuit may occur.

An object of the present invention is to improve the image quality of an organic light emitting display device.

Another object of the present invention is to provide an organic light emitting display device capable of eliminating horizontal dimming that may occur when black data is inserted.

To achieve this object, an organic light emitting display device according to the present invention includes a pixel unit in which a plurality of pixels are formed by crossing a plurality of gate lines and a plurality of data lines; a gate driver driving the plurality of gate lines; a data driver driving the plurality of data lines; a black data insertion unit providing black data inserted between periods in which the data signals output from the data driver are applied to the pixel unit; and a timing control unit controlling a driving clock of the gate driver which determines a time at which the black data output through the black data inserting unit is applied, thereby removing a dimming phenomenon that may occur due to simultaneously inserting black data in units of n lines. It is a feature of the configuration that it is made up of.

The timing controller of the organic light emitting display device according to the present invention supplies a pulse width for inserting black data included in driving clocks supplied to some gate lines of each frame among driving clocks provided to the gate driver to other gate lines. It outputs differently from the pulse width for black data insertion of the clock.

The timing controller of the organic light emitting display according to the present invention removes the dimming phenomenon by varying the pulse width for inserting black data among driving clocks of the first line of each frame in units of n data lines into which black data is simultaneously inserted. .

The timing controller of the organic light emitting display device according to the present invention outputs a pulse width for inserting black data among the first driving clocks of every frame as half of a pulse width for inserting black data of a driving clock supplied to another gate line to dim. eliminate the phenomenon.

The timing controller of the organic light emitting display device according to the present invention controls the gate line where the dimming phenomenon occurs to be shifted in units of frames.

The timing controller of the organic light emitting display device according to the present invention controls the gate line driving clock so that the gate driving order is inverted and driven for each frame in units of n (n is a positive integer) data lines into which black data is simultaneously inserted. and sequentially driven in reverse order from the n-th line in even-numbered frames.

The timing controller of the organic light emitting diode display according to the present invention drives the gate by alternating the gate driving order for each frame in units of n lines (n is a positive integer).

In the organic light emitting diode display according to the present invention, the repetition period of the clock signal is as many as the number of n lines in which black data is received simultaneously, and the order in which the clock signal is generated is output differently for n frames.

Effects of the organic light emitting display device according to the present invention are as follows.

First, the image quality of the organic light emitting display device is improved.

Second, the occurrence of horizontal dimming can be eliminated.

1 is a schematic block diagram of an organic light emitting display device according to the present invention.
2A is an exemplary diagram illustrating a hold type display method, and FIG. 2B is an exemplary diagram illustrating an impulse display method.
3 is an exemplary diagram illustrating a technique of inserting black data in an organic light emitting display device according to the present invention.
4 is an exemplary diagram illustrating gate driving waveforms of the organic light emitting display device according to the first embodiment of the present invention.
5 is an exemplary diagram illustrating gate driving waveforms of an organic light emitting display device according to a second embodiment of the present invention.
6A and 6B are exemplary diagrams illustrating gate driving waveforms of an organic light emitting display device according to a third embodiment of the present invention.
7 is an exemplary diagram illustrating another form of a gate driving waveform according to an organic light emitting display device according to a third embodiment of the present invention.

For the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention can be implemented in various forms, and It should not be construed as limited to the described embodiments.

Since the present invention can have various changes and can have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as being “directly connected” or “directly connected” to another element, it should be understood that there are no intervening elements. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that the disclosed feature, number, step, operation, component, part, or combination thereof exists, but that one or more other features or numbers, It should be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Meanwhile, when a certain embodiment can be implemented differently, functions or operations specified in a specific block may occur in a different order from the order specified in the flowchart. For example, two successive blocks may actually be performed substantially concurrently, or the blocks may be performed backwards depending on the function or operation involved.

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

1 is a schematic block diagram of an organic light emitting display device according to an exemplary embodiment of the present invention. Referring to FIG. 1 , an organic light emitting display device according to an exemplary embodiment of the present invention includes a pixel unit including a plurality of pixels 40 connected to scan lines S1 to Sn and data lines D1 to Dm. 30), the gate driver 10 for driving the scan lines (S1 to Sn), the data driver 20 for driving the data lines (D1 to Dm), the pixel unit 30 and the data driver ( 20) a black data insertion unit 60 provided between the data drivers 20 and providing black data to the pixel unit 30 to be inserted between periods in which the data signals output from the data driver 20 are applied; A timing controller 50 that controls the driving clock of the gate driver, which determines the time at which the black data output through the black data insertion unit is applied, to eliminate dimming that may occur due to simultaneous insertion of black data in units of n lines. ) is provided.

The timing control unit 50 controls the operation of a data control signal (DCS), a scan control signal (SCS), and the black data insertion unit 60 in response to synchronization signals supplied from the outside. Generates an enable signal to control.

That is, the data driving control signal DCS generated by the timing controller 50 is supplied to the data driving unit 20, the scan driving control signal SCS is supplied to the gate driver 10, and the enable signal is the black data It is supplied to the insertion part (60). The timing controller 50 supplies data supplied from the outside to the data driver 20 .

The gate driver 10 receives the scan driving control signal SCS from the timing controller 50, generates a scan signal, and sequentially supplies the generated scan signal to the scan lines S1 to Sn.

The data driver 20 receives the data driving control signal DCS from the timing controller 50, generates a data signal, and supplies the generated data signal to the data lines D1 to Dm in synchronization with the scan signal. . That is, each output channel O1 to Om of the data driver 20 is connected to the data lines D1 to Dm in correspondence with each other.

The pixel unit 30 receives external first and second power sources ELVDD and ELVSS and supplies them to the respective pixels 40 . Each of the pixels 40 supplied with the first power source ELVDD and the second power source ELVSS generates a current flowing from the first power source ELVDD to the second power source ELVSS via the light emitting device in response to a data signal. By controlling, light corresponding to the data signal is generated. At this time, the first power source ELVDD has a higher voltage level than the second power source ELVSS.

2A shows an image display state of a display device driven by a hold type method. That is, data is supplied to each of the pixels constituting the pixel unit during the scan period in which scan signals are sequentially supplied to the scan lines, and the data supplied to the pixels is maintained during the non-scan period, which is the majority of one frame period, thereby displaying an image will do

A new display method has been proposed to prevent motion bluring occurring in a display device driven by a hold type method. As shown in the image change shown in FIG. 2B, the display device is driven in an impulse method. As shown in FIG. 3, black data is inserted between each image frame. A new data enable signal DE_new is generated by adding one driving clock to the input data enable signal DE, and black data B is inserted into the data signal Data.

The present invention is based on a technique in which gate drivers are sequentially opened and a technique in which black data is displayed on a data signal provided through a data line by simultaneously opening a plurality of gates to insert black data.

The following waveform diagram shows only 8 gate line driving clocks in which pulses for inserting black data appear at the same time on 4 gate lines in order to explain the operation of the present invention.

4 is an exemplary diagram illustrating gate driving waveforms of the organic light emitting display device according to the first embodiment of the present invention.

In the organic light emitting display device according to the present invention, the timing control unit supplies a pulse width for inserting black data included in a driving clock supplied to some gate lines of each frame among driving clocks provided to the gate driver to other gate lines. Control to output differently from the pulse width for black data insertion of the clock. In the first embodiment, a case in which pulses for inserting black data appear on four gate lines at the same time is described as an example, but black data can be simultaneously inserted into n (n is a positive integer) gate lines. . In the first embodiment, the technical features of the first embodiment are applied in units of four gate lines, and the present invention is not limited to the number of gate lines into which black data is simultaneously inserted.

That is, the timing controller in the organic light emitting diode display according to the first embodiment sets the pulse width for inserting black data among the driving clocks of the first gate line of each frame in units of four gate driving lines into which black data is simultaneously inserted. control to change.

Preferably, the pulse width for black data insertion from the driving clocks (CLK1 to CLK3) other than the first driving clock (CLK0) of each frame is "T", and black data insertion of the first driving clock (CLK0) is performed. The pulse width for this is "T/2". That is, by reducing the pulse width for inserting black data by half, the gate is opened by the first driving clock of the next frame to remove the horizontal dimming phenomenon caused by displayed image data. In addition, since this embodiment shows the case where black data is simultaneously inserted into 4 gate lines as an example, the width of the pulse for inserting black data of the 5th gate driving clock (CLK4) also becomes "T/2", and thereafter The same is repeatedly applied to the gate driving clocks (CLK8, CLK12, ...) of 4 gate driving lines as a unit. Also, this operation is equally applied to every frame. Therefore, horizontal dimming caused by black data insertion can be removed from the entire screen.

As another embodiment of the present invention, the timing control unit controls the gate line where the dimming phenomenon occurs to be shifted in units of frames. That is, in the first embodiment, the same technology is applied to all frames, whereas in the following second and third embodiments, technical features can be applied on a frame-by-frame basis.

5 is an exemplary diagram illustrating gate driving waveforms of an organic light emitting display device according to a second embodiment of the present invention. As shown in FIG. 4 , the timing control unit generates a gate line driving clock so that the driving order of gates is inverted for each frame in units of 4 scan lines for simultaneously inserting black data into image data provided to the pixel unit. is sequentially driven in the reverse order from the 4th line in even-numbered frames.

That is, in the case where pulses for inserting black data are simultaneously output to 4 gate lines as an example, driving clocks are sequentially provided to each gate line. In the 1st frame, the driving clock of the first gate line ( Pulses for inserting black data are simultaneously output from the driving clock (CLK3) of the fourth gate line from CLK0), and pulses for inserting black data are simultaneously output from the fifth driving clock (CLK4) to the eighth driving clocks (CLK7). do.

However, in the 2nd frame, since the driving clock (CLK3) of the fourth gate line is sequentially provided in the reverse order, CLK2, CLK1, and CLK0 are provided, the gate of the corresponding gate line is opened. Of course, these operations are sequentially provided in the order of CLK6, CLK5, and CLK4 in the reverse order from the driving clock (CLK7) of the eighth gate line in the following gate lines, so that the gate of the corresponding gate line is opened.

Meanwhile, the driving operation of sequentially opening the gates in the reverse order is implemented in each even-numbered frame, and the gate driving in the 3rd frame is performed in the same way as in the 1st frame.

The timing controller according to the second embodiment of the present invention alternates the gate driving order with a cycle of four gate lines for each frame and controls the driving order to be changed. Therefore, since horizontal dimming occurs while alternating on a frame-by-frame basis, the horizontal dimming phenomenon cannot be recognized from a cognitive point of view. Even in this second embodiment, the cycle of four gate lines is just an example, and the number of gate lines for simultaneously opening gates for inserting black data is variable, and the present invention is not limited thereto.

6A and 6B are exemplary diagrams illustrating gate driving waveforms of an organic light emitting display device according to a third embodiment of the present invention. That is, as in the second embodiment, a technique for removing horizontal dimming caused by black data insertion by controlling a driving clock provided to a gate line on a frame-by-frame basis is shown.

The timing control unit controls the repetition period of the clock signal to have as many as the number of n lines in which black data simultaneously enters, and the order in which the clock signal is generated is randomly output differently for n frames.

For example, when black data is simultaneously inserted in units of four gate lines as shown in FIG. 6A, black data is inserted while gates are sequentially opened in the first frame.

In the second frame, driving clocks CLK3 and CLK7 are output so that the gates of the 4th gate line and the 8th gate line open first. After that, the gate is opened by (CLK0, CLK1, CLK2) and (CLK4, CLK5, CLK6).

Meanwhile, in the third frame, driving clocks CLK2 and CLK6 are output so that the gates of the third gate line and the seventh gate line open first. After that, the gate is opened by driving clocks (CLK3, CLK0, CLK1) and (CLK7, CLK4, CLK5).

As shown in FIG. 6B, in the fourth frame, driving clocks CLK1 and CLK5 are output so that the gates of the second and sixth gate lines open first. After that, the gate is opened by driving clocks (CLK2, CLK3, CLK0) and (CLK6, CLK7, CLK4).

Thereafter, the gate line driving clocks in the fifth frame and the sixth frame are output identically to the gate line driving clocks in the first frame and the second frame in FIG. 6A. That is, in the third embodiment of the present invention, when black data is simultaneously inserted in units of n number of gate lines, driving clocks provided to the gate lines in units of n number of frames are controlled so as to cause horizontal dimming caused by the insertion of black data. can be removed. Also, in the third embodiment, the method in which the gate of the pixel connected to the corresponding gate line is opened first by the fourth driving clock CLK3 and the eighth driving clock CLK7 in the second frame has been described, but as shown in FIG. 7, In the second frame, the gate of the pixel connected to the corresponding gate line is opened first by the third driving clock CLK2 and the seventh driving clock CLK6, and in the third frame, the fourth driving clock CLK3 and the eighth driving clock ( CLK7) may be implemented in such a way that the gate of the pixel connected to the corresponding gate line is opened first. In this way, by randomly driving the order in which the gates are first opened in units of n frames, it is possible to remove the horizontal dimming phenomenon caused by the dimming phenomenon caused by the insertion of black data in each frame continuously occurring in the same gate line. As a result, the image quality of the organic light emitting display device is improved.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done.

10: gate driver 20: data driver
30: pixel part 40: pixel
50: timing control unit 60: black data insertion unit

Claims (8)

a pixel unit in which a plurality of pixels are formed by crossing a plurality of gate lines and a plurality of data lines;
a gate driver driving the plurality of gate lines;
a data driver driving the plurality of data lines;
a black data insertion unit providing black data inserted between periods in which the data signals output from the data driver are applied to the pixel unit;
A timing control unit controlling the driving clock of the gate driver, which determines the time at which the black data output through the black data insertion unit is applied, to eliminate dimming that may occur due to simultaneous black data insertion in units of n lines do,
The timing controller outputs a pulse width for inserting black data among the first driving clocks of each frame as half of a pulse width for inserting black data of a driving clock supplied to another gate line;
An organic light emitting display device that is driven by alternating a gate driving sequence for each frame in units of n (n is a positive integer) lines. delete delete delete The organic light emitting diode display device as claimed in claim 1 , wherein the timing control unit controls the gate line where the dimming phenomenon occurs to be shifted in units of frames. 6. The method of claim 5 , wherein the timing control unit controls a gate line driving clock such that a gate driving order is inverted and driven for each frame in units of n gate lines into which black data is simultaneously inserted, so that the gate line driving order is reversed from the nth line in an even numbered frame. An organic light emitting display device characterized in that it is sequentially driven by. delete 6. The organic light emitting display of claim 5, wherein the repetition period of the clock signal is as many as the number of n lines in which black data simultaneously enters, and the order in which the clock signal is generated is randomly output differently for n frames. Device.

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