KR20190071486A - Rollable flexible display device - Google Patents

Abstract

The present invention provides a rollable and flexible display device including a display panel and a compensation circuit unit. The display panel displays an image and is rolled or unrolled in a scroll shape. The compensation circuit unit determines whether a display mode of the display panel is a full display mode or a partial display mode, defines, when the display mode of the display panel corresponds to the partial display mode, an effective image display area in which an effective image is displayed and a non-effective image display area in which a non-effective image is displayed, and outputs a compensation data signal compensating and emitting the non-effective image display area.

Description

[0001] ROLLABLE FLEXIBLE DISPLAY DEVICE [0002]

The present invention relates to a scroll type flexible display device.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, an organic light emitting display (OLED), an electrophoretic display (ED), a liquid crystal display (LCD), and a plasma display panel (PDP) And the like are increasing.

The display apparatus includes a display panel including a plurality of sub-pixels, a driver for driving the display panel, and a controller for controlling the driver. The driving unit includes a scan driver for supplying a scan signal (or a gate signal) to the display panel, and a data driver for supplying a data signal to the display panel.

Some of the display devices described above, for example, the electrophoretic display device and the organic light emitting display device, can be flexible, so that the display panel can be bent or curved, and the display panel can be rolled up and rolled Modification is possible.

On the other hand, a display device capable of deforming the display panel in a rolled shape or the like is called a rolled flexible display device or a rollable display device. Such a display device can be utilized in various fields and its research is continuously carried out.

The present invention for solving the above-mentioned problems of the background art improves or prevents deterioration problems (whether deteriorated / non-degraded boundary lines) that may occur in the partial display mode of the rolled type flexible display device, .

According to the present invention, there is provided a rollover type soft display device including a display panel and a compensation circuit portion. The display panel displays images and is rolled or rolled up into a scroll. The compensation circuit section distinguishes whether the display mode of the display panel is the full display mode or the partial display mode. When the partial display mode is selected, the compensation circuit section divides the effective video display area in which the effective video is displayed on the display panel, A display area is defined, and a compensation data signal for compensating the non-effective image display area is emitted.

The compensation circuit section can output a compensation data signal for compensating for all or a part of the non-effective image display region to emit light.

The compensation data signal may be provided based on valid data displayed in the effective video display area.

The compensation data signal may be provided in the form of a gradation pattern that gradually becomes darker from the start line to the last line of the ineffective image display area, or vice versa.

The gradient pattern and the inverse gradient pattern may be alternated every odd frame and every even frame.

The compensation data signal may be provided with valid data and black data indicating black.

The non-valid image display area may display valid data and black data for at least one data line and at least one scan line.

The positions of the valid data and the black data can be alternated for the odd frame and the even frame.

The compensation circuit part may generate a compensation data signal for compensating the non-effective image display area to emit light based on valid data or arbitrary data, and store the compensation data signal in the memory part.

The valid data and the black data are arranged to be dispersed over at least two scan lines, and the positions of the valid data and the black data may be alternated in the odd frame and the even frame.

The valid data and the black data are arranged to be positioned one by one on one data line, and the positions of the valid data and the black data may be alternated with K (K is an integer of 2 or more) lines on the basis of the scan line.

The valid data and the black data are arranged to be positioned one by one on one scan line, and the positions of the valid data and the black data can be alternated for the odd frame and the even frame.

INDUSTRIAL APPLICABILITY The present invention can improve or prevent the deterioration problem (whether the deterioration / non-deterioration boundary line) that may occur in the partial display mode of the rolled type soft display device, and can improve the display quality and lifetime of the display panel .

1 is a schematic block diagram of an organic light emitting display according to an embodiment of the present invention;
2 is a schematic circuit configuration diagram of a subpixel.
3 is a plan view showing a display panel and its peripheral devices connected and modularized;
4 is a view showing a scroll type flexible display device;
5 is a schematic view for explaining a mechanical driving concept of a rolled type flexible display device;
6 is a schematic view for explaining a driving concept for each display mode of the rolled type soft display device;
7 is a diagram showing an example of deterioration that may occur in the partial display mode;
8 is a view showing an example of deterioration that may occur when switching to full display mode after partial display;
9 is a flowchart illustrating a method of compensating a black display area according to an embodiment of the present invention.
10 is a diagram for explaining an example of a compensation method according to an embodiment of the present invention;
11 is a view for explaining an effect according to an embodiment of the present invention.
12 and 13 are views for explaining an example of a specific method for black display area detection.
FIGS. 14 to 16 are diagrams for explaining an example of a specific method for detecting the data voltage of the last light emission line. FIG.
Figures 17 to 21 illustrate an example of compensating a black display area based on data voltages stored in a line buffer.
22 is a view illustrating a compensation circuit of a rollover type flexible display device according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The scroll type flexible display device described below can be implemented by an LED (Light Emitting Display Device), an electrophoretic display device (ED), a liquid crystal display (LCD) . The electroluminescent display device includes an organic light emitting diode or an inorganic light emitting diode. Hereinafter, a rolled flexible display device will be described as an embodiment based on an organic light emitting display device including an organic light emitting diode.

FIG. 1 is a schematic block diagram of an organic light emitting display according to an embodiment of the present invention, and FIG. 2 is a schematic circuit configuration diagram of a subpixel.

1, the organic light emitting display includes an image processing unit 110, a timing controller 120, a data driver 140, a scan driver 130, and a display panel 150. [ .

The image processing unit 110 outputs a data enable signal DE together with a data signal DATA supplied from the outside. The image processing unit 110 may output at least one of a vertical synchronizing signal, a horizontal synchronizing signal, and a clock signal in addition to the data enable signal DE, but these signals are omitted for convenience of explanation.

The timing controller 120 receives a data signal DATA from a video processor 110 in addition to a data enable signal DE or a driving signal including a vertical synchronizing signal, a horizontal synchronizing signal, and a clock signal. The timing controller 120 includes a gate timing control signal GDC for controlling the operation timing of the scan driver 130 and a data timing control signal DDC for controlling the operation timing of the data driver 140, .

The data driver 140 samples and latches the data signal DATA supplied from the timing controller 120 in response to the data timing control signal DDC supplied from the timing controller 120 and converts the sampled data signal into a gamma reference voltage . The data driver 140 outputs the data signal DATA through the data lines DL1 to DLn. The data driver 140 may be formed in the form of an IC (Integrated Circuit).

The scan driver 130 outputs a scan signal while shifting the level of the gate voltage in response to the gate timing control signal GDC supplied from the timing controller 120. The scan driver 130 outputs a scan signal through the scan lines GL1 to GLm. The scan driver 130 is formed in the form of an integrated circuit (IC) or a gate-in-panel type display panel 150.

The display panel 150 displays an image corresponding to the data signal DATA and the scan signal supplied from the data driver 140 and the scan driver 130. The display panel 150 includes sub-pixels SP that operate to display an image. The subpixels SP are formed on a flexible substrate which can be bent or bent.

The subpixels SP are formed in a top emission mode, a bottom emission mode, or a dual emission mode depending on the structure. The subpixels SP include a red subpixel, a green subpixel, and a blue subpixel or a white subpixel, a red subpixel, a green subpixel, and a blue subpixel. The subpixels SP may have one or more different emission areas depending on the emission characteristics.

As shown in FIG. 2, one sub-pixel includes a switching transistor ST1, a driving transistor DR, a capacitor Cst, a compensation circuit CC, and an organic light emitting diode OLED.

The switching transistor ST1 operates in response to a scan signal supplied through the first scan line GL1 so that a data signal supplied through the first data line DL1 is stored as a data voltage in the capacitor Cst.

The driving transistor DR operates so that a driving current flows between the first power supply line EVDD and the second power supply line EVSS in accordance with the data voltage stored in the capacitor Cst. The organic light emitting diode OLED operates to emit light in accordance with the driving current generated by the driving transistor DR.

The compensation circuit CC is a circuit added in the sub-pixel to compensate for the threshold voltage of the driving transistor DR, deterioration of the organic light emitting diode OLED, and the like. The compensation circuit CC consists of one or more sensing transistors.

The sensing transistor operates to sense the threshold voltage of the organic light emitting diode (OLED), the threshold voltage of the driving transistor DR, and the like. The value sensed by the sensing transistor may be transmitted to a device such as a timing controller through a data driver. The device such as the timing controller can compensate the data signal to be supplied to the data driver based on the sensing value. The configuration of the compensation circuit (CC) or the compensation method using the compensation circuit (CC) can be changed into various forms.

Hereinafter, a mechanism structure for implementing a rolled type flexible display device, an embodiment using the same, and the like will be described.

FIG. 3 is a plan view showing a display panel and its peripheral devices connected and modularized, FIG. 4 is a view showing a scroll type flexible display device, and FIG. 5 is a schematic view illustrating a mechanical drive concept of a scroll type flexible display device Fig.

As shown in Fig. 3, the display panel 150 and its peripheral devices are connected and modularized. The scan driver 130 is formed on the non-display region of the display panel 150 in a gate-in-panel manner. The data driver 140 is formed in an IC form and mounted on the source substrate 145. The timing control unit 120 is formed in an IC form and mounted on the control board 125. [

The scan driver 130 may be formed on the left, right, or right and left sides of the display area AA in a gate in panel manner in order to form the display panel 150 in a rolled shape, but the present invention is not limited thereto .

The data driver 140 may be mounted on a source substrate 145 formed of a flexible circuit board while the timing controller 120 may be mounted on a control board 125 formed of a printed circuit board. The source substrate 145 and the control substrate 125 may be connected in a connector manner by means of a cable 127, but are not limited thereto.

4 and 5, the scroll type flexible display device includes a display panel 150 (hereinafter referred to as a display panel) modularized in the form of FIG. 3, a panel roller portion 160, and a storage portion 180 ).

The panel roller unit 160 is formed in a circular shape. The panel roller unit 160 provides a structure in which the display panel 150 can be rolled and spread on its outer circumferential surface. The panel roller portion 160 is accommodated in the storage portion 180. The storage portion 180 houses the display panel 150 and the panel roller portion 160. A driving device such as a motor, a disk, a power source, and the like for electrically rotating the panel roller unit 160 may be included in the accommodating unit 180.

The receiving portion 180 may be designed in a circular shape, an elliptical shape, a rectangular shape, a rectangular shape, or a polygonal shape depending on the configuration and design of the driving device. On the other hand, the panel roller unit 160 may be rotated mechanically by a wheel and a spring or manually by a user's attraction. The display panel 150 is moved out of the receiving part 180 or into the receiving part 180 according to the rotating direction of the driving device.

For example, as shown in FIG. 5 (a), when the driving device rotates in the r1 direction, the panel roller unit 160 spreads the dried display panel 150 on its outer circumferential surface. In this case, since the display panel 150 is moved in the x2 direction, the display panel 150 is exposed to the outside of the storage unit 180. 5 (b), when the driving unit rotates in the r2 direction, the panel roller unit 160 swings the display panel 150 on its outer circumferential surface. In this case, since the display panel 150 is moved in the x1 direction, the display panel 150 enters the inside of the storage unit 180. [

7 is a view showing an example of deterioration that may occur in the partial display mode, and FIG. 8 is a view showing an example of the deterioration that may occur in the partial display mode, FIG. 6 is a diagram showing an example of deterioration that may occur when switching to the second embodiment.

As shown in FIG. 6A, the scroll type flexible display device has a full display mode (full vision mode) in which an image is displayed after a light-emitting area of the display panel 150 is exposed to the maximum, It is possible to operate in a partial display mode in which an image is displayed after only a part of the area is exposed.

6 (b), when the display panel 150 of the rolled type flexible display device is operated in the partial display mode, the non-display area located inside the roller outputs black .

In addition, the area exposed to the outside of the accommodating portion 180 displays an effective image to perform a partial display mode. On the other hand, a region located inside the accommodating portion 180 displays black as an ineffective image. As described above, an area for displaying an effective image can be defined as an effective image display area (EA), and an area for displaying black can be defined as an ineffective image display area or a black display area (BA).

7A and 7B, after the display panel 150 of the rolled type flexible display device is driven for a long time in a partial display mode, the effective video display area EA and the black display area If a monochromatic pattern of the same gray level is outputted to the gray level BA, a luminance difference may occur between the two areas EA and BA.

As shown in FIG. 8 (a), after driving the display panel 150 for a long time such that the effective video display area EA and the black display area BA are divided into a deteriorated area and a non-degraded area, the display panel 150 is switched to the full display mode When a specific image is displayed, a gradation difference may occur between the two areas EA and BA as shown in the example of FIG.

To explain the reason why the above phenomenon occurs, the effective image display area EA deteriorates as the image causing deterioration is displayed for a long time, but the black display area BA actually causes deterioration This is because deterioration is relatively less progressed as a small black possibility is displayed for a long time.

Due to such a phenomenon, the effective image display area EA is defined as a deteriorated area where deterioration proceeds, while the black display area BA is defined as a non-degraded area in which deterioration hardly progresses. If the difference in the deterioration between the two areas (EA, BA) is sharply distinguished, the user is more likely to recognize the deterioration, which needs to be improved.

 FIG. 9 is a flowchart for explaining a method of compensating a black display region according to an embodiment of the present invention. FIG. 10 is a view for explaining an example of a compensation method according to an embodiment of the present invention, Fig. 8 is a diagram for explaining effects according to the embodiment. Fig.

As shown in FIGS. 9 and 10, in an embodiment of the present invention, a method of compensating a black display area to solve a problem caused by the experiments of FIGS. 7 and 8 is proposed. The compensation method of the black display area will be briefly described as follows.

The display panel is driven (S110), and the presence or absence of black data for displaying black in the black display area BA of the display panel is determined (S120). If there is no black data in the black display area BA of the display panel (No), the presence or absence of black data is continuously determined while driving the display panel Panel.

Otherwise, it is determined whether or not black data exists in the black display area BA of the display panel (Yes), that is, the Nth frame (S130). The reason for determining whether it is the Nth frame (Nth frame) is for determining the timing (period) of the compensation. Accordingly, N may be defined as an integer of 1 or more, but is not limited thereto. If it is not the Nth frame (No), the display panel is continuously driven and monitored until the Nth frame (Nth frame) is reached.

Otherwise, if the current frame corresponds to the Nth frame (Yes), a black display area (BA) detection for recognizing the black area is performed. Then, the data voltage value (Last light emission line Vdata) of the last light emission line is stored (S140) and the black display area BA is compensated based on the data voltage value (Last light emission line Vdata) (S150). Here, the data voltage value (Last light emission line Vdata) is a value predicted when the data signal is converted into a voltage, not a substantial voltage value.

Meanwhile, in the embodiment, the black display area BA is compensated by the data voltage value (Last emission line Vdata) of the last light emission line. However, this is merely an example, and the black display area BA may be light- So that the degradation difference between the two regions EA and BA can be mitigated.

To compensate the black display area BA, it is also possible to compensate the entire area or to compensate only a part of the area CA of the black display area BA adjacent to the effective video display area EA as shown in Fig. 10A But are not limited thereto.

Compensating the black display area BA based on the embodiment can alleviate the problem of luminance difference between the two areas EA and BA before and after the improvement as shown in FIG. 10 (b) It will become clear. As can be seen from FIGS. 11 (a) and 11 (b), when the compensation is performed according to the embodiment of the present invention, it can be seen that the interface between the two regions EA and BA divided by the deteriorated / .

Therefore, by compensating the black display area BA based on the embodiment of the present invention, it is possible to improve or prevent the deterioration problem (whether the deterioration / non-degradation boundary line) that may occur in the partial display mode of the rolled soft display device , And it is possible to improve display quality and lifetime of the display panel.

12 and 13 are views for explaining an example of a specific method for black display area detection. Hereinafter, a UHD-level display panel having a total of 2160 scan lines and 3840 data lines will be described as an example, but the present invention is not limited to a display panel having a specific resolution.

As shown in FIGS. 12 and 13, in order to detect the black display area, a method of storing the coordinates of the black line in which the black data voltage Black exists after driving the display panel can be used. 12, Sum_V means the sum of data voltages for one horizontal line, pixel_Vn means one pixel data voltage, and n is defined as the number of data lines according to the resolution of the display panel.

In the embodiment, the number of scan lines is 2160 and the number of data lines is 3840, which is based on a UHD level display panel. In order to detect a data voltage outputted from the data lines, n = 3840). < / RTI > Also, it may include determining whether the last scan line (Line = 2159) has been reached. And if a black line corresponding to the black display area is found, storing the coordinates of the corresponding line in a memory or the like (Y-axis). When the display panel is driven based on the above-described method, it is possible to find out the coordinates in which the black data voltage Black exists for a plurality of frames.

14 to 16 are diagrams for explaining an example of a specific method for detecting the data voltage of the last light emitting line.

As shown in FIG. 14, when a data voltage inputted during the first frame (1st frame), the 2nd frame (2nd frame) to the Nth frame (Nth Frame) is detected, You can find out.

As shown in FIG. 15, the valid lines (1 to 1560) indicating the valid image and the last light emitting line (1560) of the valid lines, the black lines (1561 to 2160) After the line 1561 is found, the effective video display area EA and the black display area BA can be defined.

As shown in FIG. 16, one of the at least two methods can store the data voltage values present in the valid lines in the line buffer and compensate the black display area based on the stored data voltage values. Hereinafter, the two compensation methods described above will be described as follows.

However, the compensation method described below is only one example, and the present invention can not be implemented only by the compensation method using the line voltage buffer and the data voltage values existing in the valid lines. That is, it is also possible to display the compensation value or the compensation pattern stored in the memory instead of the data voltage values present in the valid lines in a black display area for every I (I is an integer of 1 or more) frames.

In the first example of FIG. 16A, only the data voltage values (voltage values of 1st to 3840th) of the last light emitting line 1560 of the valid lines are stored in a line buffer, and based on this, It is a way to compensate.

The second example of FIG. 16 (b) obtains average values (Avg.) Of data voltage values (voltage values of 1st to 3840th) near the last luminous line of the valid lines (1510 to 1560) Line Buffer) and compensates the black display area based on this.

Hereinafter, an example of compensating the black display region based on the data voltages stored in the line buffer will be described.

17 to 21 illustrate examples of compensating the black display area based on the data voltage values stored in the line buffer.

As shown in the first compensation example of FIG. 17, the start line 1561 and the last line 2160 of the black display area BA generate compensated data voltage values based on the data voltage values stored in the line buffer, Can be compensated. The first data line to the 3840th data lines (1st to 3840th) located at the start line 1561 and the last line 2160 of the black display area BA have a compensation data voltage value (CD1 to CDn).

The start line 1561 and the last line 2160 of the black display area BA are divided into the compensation data voltage values CDa To CDb) are generated. The compensation data voltage values CDa to CDb are processed so as to be alternated with an odd frame and an even frame, and compensated based on the corrected data voltage values CDa to CDb. At this time, the first compensation data voltage value CDa may be provided based on the data voltage of the last emission line of the valid lines and output to the one data line, but is not limited thereto.

The first to third patterns CD1 to CD3 included in the first compensation data voltage value CDa are based on the valid data corresponding to the data voltage value of the last light emission line but the second compensation data voltage value CDb is It is based on black data representing black. Therefore, the data line to which the first compensation data voltage value CDa is supplied is compensated to emit light, but the data line to which the second compensation data voltage value CDb is supplied does not compensate the light emission. That is, the data line to which the second compensation data voltage value CDb is supplied is black or not driven.

The positions of the first compensated data voltage value CDa and the second compensated data voltage value CDb constituting the compensated data voltage values CDa to CDb are shifted from the scan line to the line- (Line-by-line). The first compensation data voltage value CDa and the second compensation data voltage value CDb are output to be distributed over at least two scan lines, one for each data line. However, the positions at which the first compensation data voltage value CDa and the second compensation data voltage value CDb are outputted are alternated in a line-by-line manner in accordance with the change of odd and even frames.

19, the positions of the first compensation data voltage value CDa and the second compensation data voltage value CDb constituting the compensation data voltage values CDa to CDb are set to K K is an integer of 2 or more) lines. The first compensated data voltage value CDa and the second compensated data voltage value CDb are outputted one by one on one data line, but the position is alternated every K (K is an integer equal to or more than two) corresponding to the change of odd and even frames do.

20, the positions of the first compensated data voltage value CDa and the second compensated data voltage value CDb constituting the compensated data voltage values CDa to CDb are set to be the same as those of the line voltage (Line-by-line). The first compensation data voltage value CDa and the second compensation data voltage value CDb are output to one scan line. However, the positions at which the first compensation data voltage value CDa and the second compensation data voltage value CDb are outputted are alternated to the line by line corresponding to the change of the odd and even frames.

21, the start line 1561 and the last line 2160 of the black display area BA are divided into the compensation data voltage values GCD1_O, GCD1_E, and GCD1_E based on the data voltage values stored in the line buffer, GCDn_O, GCDn_E) are generated. At this time, the compensated data voltage values (GCD1_O, GCD1_E to GCDn_O, and GCDn_E) are processed so as to alternate into an odd frame and an even frame, and compensation can be performed based on the compensated data voltage values.

The compensation data voltage values GCD1_O to GCDn_O of the odd frame are provided in the form of a gradation pattern that gradually becomes darker from the start line 1561 to the last line 2160 of the black display area BA . On the other hand, the compensation data voltage values GCD1_E to GCDn_E of the even frame are inversely gradated from the start line 1561 to the last line 2160 of the black display area BA, ). ≪ / RTI >

FIG. 22 is a view illustrating a compensation circuit of a rollover type soft display device according to an embodiment of the present invention.

As shown in FIGS. 6 and 9 to 22, the scroll type flexible display according to the embodiment of the present invention can be compensated for by interlocking between the timing controller 120 and the memory unit 125. The timing control unit 120 includes a display area detecting unit 121, a compensation data generating unit 122 and a compensation data reflecting unit 123. [ The display area detecting unit 121, the compensation data generating unit 122, and the compensation data reflecting unit 123 may be defined as a compensation circuit unit.

The display area detecting unit 121 processes the input data signal DATA to discriminate whether the display mode of the display panel 150 is a full display mode or a partial display mode, In the display mode (partial mode), the effective image display area EA on the display panel 150 and the black display area BA to be the ineffective image display area are defined. The display area detecting unit 121 transmits information on the effective video display area EA and the black display area BA to the compensation data generating unit 122 and the compensation data reflecting unit 123. [

The compensation data generation unit 122 generates compensation data voltage values for compensating the black display area BA based on data voltage values or arbitrary data voltage values present in the effective video display area EA, (125).

The compensation data output unit 123 generates the compensation data signal CDATA by reflecting the compensation data voltage values to the input data signal DATA and outputs the compensation data signal CDATA. At this time, the compensation data output unit 123 can generate and output the compensation data signal CDATA by processing the data in the form of the example of FIGS.

The compensation data signal CDATA output from the compensation data output unit 123 is supplied to the data driver. The data driver supplies a data voltage for displaying an image to the effective video display area EA based on the compensation data signal CDATA and a compensation voltage for causing a degradation similar to the effective video display area EA in the black display area BA The data voltage is applied. As a result, the effective data is displayed in some or all of the black display area BA defined on the display panel, or the compensated light emission in which the effective data and the black data are alternately displayed on at least one data line and at least one scan line do. Some or all of the black display area BA defined on the display panel may perform another type of compensated emission.

INDUSTRIAL APPLICABILITY The present invention is capable of improving or preventing deterioration problems (whether deteriorated / non-degraded boundary lines) that may occur in the partial display mode of the rolled type flexible display device, and also capable of improving the display quality and lifetime of the display panel It is effective.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

120: timing control unit 140:
130: scan driver 150: display panel
160: Panel roller unit 180:
125: memory unit 121: display area detecting unit
122: compensation data generation unit 123: compensation data output unit

Claims (12)

A display panel that displays images and is rolled or spread in a rolled form; And
Wherein the display mode of the display panel is divided into a full display mode or a partial display mode, and if it is determined that the partial display mode is selected, an effective video display area in which an effective video is displayed on the display panel, And a compensation circuit for defining a display area and outputting a compensation data signal for causing the non-effective image display area to emit light in a compensated manner. The method according to claim 1,
The compensation circuit section
And outputs a compensation data signal for compensating for all or part of the non-valid video display area. The method according to claim 1,
The compensation data signal
Wherein the effective display region is provided on the basis of effective data displayed on the effective video display region. The method of claim 3,
The compensation data signal
The same pattern form from the start line to the last line of the ineffective image display area,
Wherein the non-effective image display region is provided in a gradation pattern shape that gradually becomes darker from a start line to a last line of the non-effective image display region, or vice versa. 5. The method of claim 4,
The gradient pattern and the inverse gradient pattern
The rollable flexible display device alternates every odd frame and every even frame. The method of claim 3,
The compensation data signal
And the black data indicating the valid data and the black data. The method according to claim 6,
The non-valid video display area
Wherein the valid data and the black data are displayed for each of at least one data line and at least one scan line. 8. The method of claim 7,
The position of the valid data and the black data is
The rollable flexible display device alternates every odd frame and every even frame. The method of claim 3,
The compensation circuit section
And generating a compensation data signal for compensating for the non-effective image display region based on the valid data or the arbitrary data, and storing the compensation data signal in a memory unit. The method according to claim 6,
The valid data and the black data
A plurality of data lines arranged in one data line and being distributed over at least two scan lines,
Wherein the effective data and the position of the black data are alternated every odd-numbered frame and every even-numbered frame. The method according to claim 6,
The valid data and the black data
One for each data line,
The position of the valid data and the black data is
(K is an integer of 2 or more) lines based on a scan line. The method according to claim 6,
The valid data and the black data
One for each scan line,
Wherein the effective data and the position of the black data are alternated every odd-numbered frame and every even-numbered frame.

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