KR101089608B1 - Driving method for display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method, and more particularly, to a display device driving method which improves a luminance reduction phenomenon caused by black data insertion driving during impulsive driving.

The driving method of the present invention includes N gate lines crossing M data lines, and each gate line is sequentially applied with a gate driving signal maintaining a high level for S time, and sequentially applied. In a display panel in which black data input timing of S time is inserted between gate driving signal timings and black data is simultaneously input to a plurality of gate lines, the black data input timings inserted between the sequentially applied gate driving signal timings are every frame. Each time is inserted with a delay of S time, and the horizontal line dim due to an abnormal amount of data filling between horizontal pixels generated due to the fixed black data insertion timing does not appear fixed only at a specific position of the display panel. The phenomenon is improved.

Description

Display panel driving method {Driving method for display panel}

1 is a frame-specific operation overview of a display panel for explaining impulsive driving

2 is a diagram illustrating a relationship between a liquid crystal panel and a gate driving signal for implementing a data addressing method in an impulsive driving method;

FIG. 3 is a diagram illustrating a horizontal line dim caused by a black data insertion method in an impulsive driving method. FIG.

4 is a block diagram illustrating a display panel driving method according to an exemplary embodiment of the present invention.

5 is a signal timing diagram for explaining a first method of a display panel driving method according to the present invention.

6 is a view illustrating an improvement of a horizontal line dim phenomenon by the display panel driving method according to the present invention.

<Brief description of the main parts of the drawing>

G1 ~ Gn: Gate line D1 ~ Dm: Data line

A: Black data input dimming B: Horizontal line dim

S: Gate driving signal and black data insertion timing

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method, and more particularly, to a display device driving method which improves a luminance reduction phenomenon caused by black data insertion driving during impulsive driving.

Impulsive driving of the liquid crystal display is a driving method proposed to remove a motion blur of a screen when a moving image is implemented.

Two impulsive driving methods are proposed, a data addressing method for inputting video data in a predetermined region of a frame and black or white data in the remaining portion, and a plurality of backlights. There is a backlight control method for controlling the lighting of the backlight corresponding to a certain region of the frame.

Referring to FIG. 1, the impulsive driving will be described. Each frame has a " blanking area " in which black or white data is inserted into a predetermined area of the frame, and the blanking area is a frame area corresponding to four gate lines. As a result, blanking regions are formed after four gate lines to which image data is input are added every frame.

FIG. 2 is a diagram illustrating a relationship between a liquid crystal panel and a gate driving signal for implementing a data addressing method among impulsive driving methods currently applied.

To sequentially drive a plurality of gate lines G1, G2, ..., G (j + 1), G (j + 2), G (j + 3), G (j + 4), ..., Gn}. Accordingly, in a liquid crystal panel in which video data is input to display a frame, some regions of the frame {G (j + 1), G (j + 2), G (j + 3), and G (j + 4) }, The gate driving signal is simultaneously applied to the black gray level video data to simultaneously form the blanking area. Of course, the position of the blanking area is variable for each frame.

When the black data is inserted into the display panel in the impulsive driving of the black data insertion method according to the above-described method, the point of time after application of image data to at least four gate lines G1 to G4 of the display panel ( The point where the first black data input timing is located in the drawing and the next black data is inserted after the image data is applied to the four gate lines G5 to G8 is displayed on the entire display panel. I'm using a method that inserts black data into a. That is, the time point at which the black data is input is generated after the first four gate line driving points, and the black data input time point is positioned at every time point after the four gate line driving points thereafter. It is characteristic.

However, as described above, when the driving timing at which the black data is input every frame is the same, that is, when the blanking area is generated at the same time every frame, the data signals between the horizontal pixel lines driven before and after the black data input timing A are the same. Differences in filling amount occur.

That is, since the time delay is generated as A by the black data input after driving the fifth gate line G5 after driving the fourth gate line G4 in FIG. 2, the fourth and fifth gate lines G4 and G5 The amount of charge of the data signal of the horizontal pixel column input through the driving is changed. In addition to this phenomenon, as shown in FIG. 3, a large number of horizontal line dims (B) in which luminance appears irregularly in the horizontal direction are generated on the display panel by black data regularly inputted at the same time point every frame. do.

The present invention has been made to solve the above problems, and an object of the present invention is to improve a horizontal line dim phenomenon caused by a time delay for inserting black data in an impulsive driving method, in particular, a black data insertion method.

The present invention to solve the above problems,

As a first proposal,

N gate lines intersecting the M data lines, and each gate line is sequentially supplied with a gate drive signal maintaining a high level for S time, and the gate time of the S drive time between the sequentially applied gate drive signal timings. In a display panel in which black data input timing is inserted and black data is simultaneously input to a plurality of gate lines, the black data input timing inserted between the sequentially applied gate driving signal timings is inserted with a delay of S time every frame. A display panel driving method is provided.

In the above driving method, the black data input timing in the first frame is inserted after the initial gate line driving signal is applied.

The driving method is characterized in that the four frames are repeated with a drive period.

The plurality of gate lines to which the black data is input are four.

As a second proposal,

N gate lines intersecting the M data lines, and each gate line is sequentially supplied with a gate drive signal maintaining a high level for S time, and the gate time of the S drive time between the sequentially applied gate drive signal timings. In a display panel in which black data input timing is inserted and black data is simultaneously input to a plurality of gate lines, the black data input timing inserted between the sequentially applied gate driving signal timings is 1S, 2S, 3S, 4S every frame. The display panel driving method of the present invention is characterized by being inserted with one delay time.

In the above driving method, the black data input timing is inserted between the gate driving signal timings with different delay times in two consecutive frames.

The driving method is characterized in that the four frames are repeated with a drive period.

The plurality of gate lines to which the black data is input are four.

Hereinafter, the first and second proposals of the display panel driving method according to the present invention will be described with reference to the configuration of the display panel of FIG. 4 and the signal timing diagram of FIG. 5.

The first method of the display panel driving method according to the present invention is to change the timing of inputting black data every frame in order to improve the horizontal line dim phenomenon which is a problem in the black data insertion method in the conventional impulsive driving method. To give.

In other words, as shown in FIG. 4, n gate lines G1 to Gn intersecting with m data lines D1 to Dm, and each gate line includes a gate driving signal for maintaining a high level for S time. The black data input timings are sequentially applied, and the black data input timings for inserting black data during S time are inserted during the sequentially applied gate driving signal timings, thereby providing a plurality of horizontal pixel columns G (j + 1), G (j + 2) For the display panel to which black data is simultaneously input to G (j + 3) and G (j + 4)}, the black data input timings inserted between the sequentially applied gate driving signal timings as shown in the timing diagram of FIG. It is a driving method which inserts by delaying time S every frame.

Therefore, in the first embodiment of the present invention, the black data insertion timing is inserted after the gate driving signal of the first gate line G1 is applied in the first first frame driving, and the black data insertion timing is performed in the second frame driving. It is inserted after the gate driving signal is applied to the second gate line G2. In the third frame driving, the timing of inserting black data is after the driving signal of the third gate line G3 is applied. In the fourth frame driving, the fourth gate is inserted. It is inserted after application of the gate drive signal of the line G4. That is, the black data insertion timing is configured by increasing the number of gate line drivings in the order of frames.

In the display panel driving method of the first embodiment of the present invention operated by the above-described method, the driving of the first to fourth frames after the fourth frame is repeatedly performed. It is most appropriate to have four pixel columns.

As shown in FIG. 6, when the timing of inserting data is sequentially delayed and inputted as described above, as shown in FIG. 6, the horizontal line dim caused by an abnormal amount of data filling between horizontal pixels generated by the black data insertion timing is fixed when the display panel is driven. Since the phenomenon is not fixed at a specific position of the display panel but distributed, the horizontal line dim phenomenon is visually improved.

The second embodiment of the present invention has the same basic concept as the above-described first embodiment of the present invention, and the timing of inserting black data described by the first to fourth frame driving shown in FIG. 5 of the first embodiment of the present invention is described. It is a random application method.

That is, the black data input timings inserted between sequentially applied gate driving signal timings are driven to be inserted with a delay time of 1S, 2S, 3S, and 4S per frame, and the black data input timings of two consecutive frames are mutually different. It is characterized by being inserted between the gate drive signal timings with a different delay time.

As in the above-described first embodiment of the present invention, the display panel driving method of the second embodiment of the present invention, which is operated by the above-described method, preferably drives the first to fourth frames after the fourth frame. In this case, it is most appropriate that 4 horizontal pixels are inputted with the black data.

In the second exemplary embodiment of the present invention, the horizontal line dim due to an abnormal amount of data filling between horizontal pixels caused by fixing the black data insertion timing when the display panel is driven does not appear fixed only at a specific position of the display panel. The dim phenomenon is improved.

The display panel driving method according to the present invention as described above can provide the best image quality by preventing the horizontal line dim phenomenon is not recognized in the display panel for performing impulsive driving by inserting the black data, and also separate parts There is an advantage that the horizontal line dim can be improved simply by changing the driving method without adding.

Claims (8)

N gate lines intersecting the M data lines, and each gate line is sequentially supplied with a gate drive signal maintaining a high level for S time, and the gate time of the S drive time between the sequentially applied gate drive signal timings. A display panel in which black data input timing is inserted to simultaneously input black data to a plurality of gate lines. The black data input timing inserted between the sequentially applied gate driving signal timings is inserted in a delayed S time every frame. The method according to claim 1, In the above driving method, the black data input timing in the first frame is inserted after the initial gate line driving signal is applied. The method according to claim 1, The driving method is a display panel driving method characterized in that the four frames are repeated with a driving period. The method according to claim 1, 4. The display panel driving method of claim 4, wherein the plurality of gate lines to which the black data is input are four. N gate lines intersecting the M data lines, and each gate line is sequentially supplied with a gate drive signal maintaining a high level for S time, and the gate time of the S drive time between the sequentially applied gate drive signal timings. A display panel in which black data input timing is inserted to simultaneously input black data to a plurality of gate lines. The black data input timing inserted between the sequentially applied gate driving signal timings is inserted with a delay time of 1S, 2S, 3S, and 4S every frame. The method according to claim 5, In the driving method, the display panel driving method is characterized in that the black data input timing is inserted between the gate driving signal timings with different delay times in two consecutive frames. The method according to claim 5, The driving method is a display panel driving method characterized in that the four frames are repeated with a driving period. The method according to claim 5, 4. The display panel driving method of claim 4, wherein the plurality of gate lines to which the black data is input are four.

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