KR20150081792A - Flexible display device and method of compensating a yellowing for the same - Google Patents

Abstract

A flexible display of the present invention comprises a display panel, a scan drive unit, a data drive unit, a power unit, a timing control unit, a sensor and a yellowing compensation unit. The yellowing compensation unit comprises: a calculation unit for calculating a difference between yellowing data and preset initial data; a look-up table for storing red compensation data, green compensation data and blue compensation data to compensate for the difference between yellowing data and initial data; and a voltage generation unit for generating a red compensation voltage, a green compensation voltage and a blue compensation voltage corresponding to red compensation data, green compensation data and blue compensation data, respectively.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a flexible display device and a method of compensating for yellowing of the flexible display device.

The present invention relates to a display device. More particularly, the present invention relates to a flexible display device and a method of compensating for yellowing thereof.

2. Description of the Related Art In recent years, various flat panel display devices that can reduce weight and volume, which are disadvantages of cathode ray tubes (CRTs), have been used. Examples of such flat panel display devices include a liquid crystal display (LCD) device, a plasma display panel (PDP) device, an organic light emitting display (OLED) device, a quantum display device, And an electrophoresis display device. 2. Description of the Related Art In general, flat panel display devices are used in a fixed form. Recently, flexible display devices that can be applied to electronic books and electronic papers have been attracting attention.

A plastic material can be used as a substrate to implement a flexible display device. When a plastic material is used as a substrate, the flexibility of the flexible display device can be improved and the weight can be reduced. However, when a flexible display device in which a plastic material is used as a substrate is used for a long time, a yellowing phenomenon in which a flexible display panel provided in the flexible display device is discolored by ultraviolet rays may occur.

An object of the present invention is to provide a flexible display device capable of compensating for the yellowing of a flexible display panel caused by prolonged use.

It is another object of the present invention to provide a method for compensating for yellowing of a flexible display device capable of compensating for the yellowing of a flexible display panel caused by prolonged use.

However, the object of the present invention is not limited to the above-mentioned objects, but may be variously expanded without departing from the spirit and scope of the present invention.

In order to accomplish one object of the present invention, a flexible display device according to embodiments of the present invention includes a flexible display panel on which a plurality of pixels each having an organic light emitting diode are formed, A data driving unit for supplying a data signal to the pixels, a power unit for providing a high power source voltage and a low power source voltage to the pixels, a scan driver for driving the scan driver, the data driver, A sensor for generating yellowing data indicating the degree of yellowing of the flexible display panel formed on the flexible display panel, and a controller for controlling the data driving unit based on the difference between the initial data and the yellowing data, Red compensation voltage, green compensation voltage and blue compensation voltage to compensate for yellowing It can include yellowing compensation unit to provide a voltage.

According to an embodiment, the yellow compensation unit may include an operation unit for calculating a difference between the initial data and the yellow data, a red compensation data for compensating a difference between the initial data and the yellow data, a green compensation data, And a voltage generator for generating a red compensation voltage corresponding to the red compensation data, a green compensation voltage corresponding to the green data, and a blue compensation voltage corresponding to the blue compensation data.

According to an embodiment, the yellow compensation unit may be located on a flexible printed circuit board connected to one end of the flexible display panel and supplying a driving control signal to the data driving unit and the scan driving unit.

According to one embodiment, the yellow compensation unit may be located in the data driving unit.

According to one embodiment, the yellow compensation unit may be located on a control printed circuit board that supplies a drive control signal to the data driving unit and the scan driving unit through a flexible printed circuit board connected to one end of the flexible display panel have.

According to an embodiment, the yellow data may be detected at a predetermined period.

According to an embodiment, the initial data may be a first color coordinate measured by outputting white light to the flexible display panel during initial operation of the flexible display device.

According to an embodiment, the yellow color data may be a second color coordinate measured by outputting the white light to the flexible display panel after the initial driving of the flexible display device.

According to an embodiment, the red compensation data, the green compensation data and the blue compensation data for compensating for the difference between the first color coordinate and the second color coordinate may be stored in a look-up table.

According to an embodiment of the present invention, the initial data may include a first red color coordinate measured by outputting red light to the flexible display panel during initial operation of the flexible display device, a first red color coordinate measured by outputting green light to the flexible display panel, A green color coordinate, and a first blue color coordinate measured by outputting blue light to the flexible display panel.

According to an embodiment, the yellow data may include a second red color coordinate measured by outputting the red light to the flexible display panel after the initial driving of the flexible display, and outputting the green light to the flexible display panel A second green color coordinate, and a second blue color coordinate measured by outputting the blue light to the flexible display panel.

According to an embodiment of the present invention, there is provided an image processing apparatus including red compensation data for compensating a difference between the first red color coordinate and the second red color coordinate, green data for compensating a difference between the first green color coordinate and the second green color coordinate, The blue compensation data for compensating for the difference between the color coordinates and the second blue color coordinate may be stored in a look-up table.

According to another aspect of the present invention, there is provided a method of compensating for yellowing of a flexible display device, the method comprising: generating yellowing data indicating a degree of yellowing of a flexible display panel included in the flexible display device; Calculating red difference data, green compensation data and blue compensation data for compensating a difference between the initial data and the yellow data, in the lookup table; A green compensation voltage corresponding to the green data, and a blue compensation voltage corresponding to the blue compensation data.

According to an embodiment, the yellow data may be detected at a predetermined period.

According to an embodiment, the initial data may be a first color coordinate measured by outputting white light to the flexible display panel during initial operation of the flexible display device.

According to an embodiment, the yellow color data may be a second color coordinate measured by outputting the white light to the flexible display panel after the initial driving of the flexible display device.

According to an embodiment, the red compensation data, the green compensation data and the blue compensation data for compensating for the difference between the first color coordinate and the second color coordinate may be stored in the look-up table.

According to an embodiment of the present invention, the initial data may include a first red color coordinate measured by outputting red light to the flexible display panel during initial operation of the flexible display device, a first red color coordinate measured by outputting green light to the flexible display panel, A green color coordinate, and a first blue color coordinate measured by outputting blue light to the flexible display panel.

According to an embodiment, the yellow data may include a second red color coordinate measured by outputting the red light to the flexible display panel after the initial driving of the flexible display, and outputting the green light to the flexible display panel A second green color coordinate, and a second blue color coordinate measured by outputting the blue light to the flexible display panel.

According to an embodiment, red compensation data for compensating a difference between the first red color coordinate and the second red color coordinate, green compensation data for compensating a difference between the first green color coordinate and the second green color coordinate, The blue compensation data for compensating for the difference between the color coordinates and the second blue color coordinate may be stored in the lookup table.

The flexible display device and the yellowing compensation method according to embodiments of the present invention measure the yellowing degree of the flexible display panel and output the red compensation voltage, the green compensation voltage and the blue compensation voltage capable of compensating for yellowing, The yellowing occurring in the panel can be compensated. However, the effects of the present invention are not limited to the effects described above, and may be variously extended without departing from the spirit and scope of the present invention.

1 is a block diagram showing a flexible display device according to embodiments of the present invention.
2 is a block diagram illustrating a yellowing compensation unit included in the flexible display device of FIG.
3 is a plan view showing an example in which the flexible display device of FIG. 1 is provided with a yellow compensation unit.
4 is a plan view showing another example in which the yellow display device of FIG. 1 is provided with a yellow compensation unit.
5 is a plan view showing another example in which the flexible display device of FIG. 1 is provided with a yellow compensation unit.
6 is a flowchart illustrating a method of compensating for yellowing of a flexible display device according to an embodiment of the present invention.
7 is a diagram showing an example in which the yellowing is compensated by the yellowing compensation method of FIG.
8 is a diagram showing another example in which the yellowing is compensated by the yellowing compensation method of FIG.

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

FIG. 1 is a block diagram showing a flexible display device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a yellowing compensation unit included in the flexible display device of FIG.

1, the flexible display device 100 includes a flexible display panel 130, a scan driving unit 140, a data driving unit 150, a power unit 160, a timing control unit 170, A sensor 180, a sensor 120, and a yellowing compensation unit 110.

The flexible display panel 130 may be formed by bonding flexible substrates. The flexible display device 100 may use a plastic material such as polyethyleneterephthalate (PET), polyimide, or the like as a substrate. The flexible display panel 130 may include a plurality of pixels (not shown). At this time, each of the pixels may include a pixel circuit, a driving transistor, and an organic light emitting diode. In this case, the pixel circuit transmits a data signal supplied from the data lines DL1, ..., DLm to the driving transistor in response to a scan signal supplied from the scan lines SL1, ..., SLn, Based on the data signal, the current flowing through the organic light emitting diode, and the organic light emitting diode can emit light based on the current. The scan driving unit 140 may supply scan signals to the pixels through the plurality of scan lines SL1 to SLn and the data driving unit 150 may supply scan signals to the plurality of data lines DL1, ..., DLm to the pixels. At this time, the data signal may be generated based on the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB, which are transmitted from the yellow compensation unit 110. The light emission control unit 180 can supply the light emission control signals to the pixels through the plurality of light emission control lines EL1, ..., ELn. The power unit 160 may provide the high voltage power supply ELVDD and the low voltage power supply ELVSS to the pixels. The timing control unit 170 may generate a plurality of control signals CTL to control the scan driving unit 140, the data driving unit 150, the light emission control unit 180 and the power unit 160. [

The sensor 120 may be formed on the flexible display panel 130 of the flexible display device 100 to detect the degree of yellowing of the flexible display panel 130 and generate yellowing data YD. The generated yellowing data (YD) may be transmitted to the yellowing compensation unit 110. At this time, since the sensor 120 is formed on the flexible display panel 130, it may have a very small size or may be formed of a transparent material. In one embodiment, the yellowing data YD may be a color coordinate measured when white light is output to the flexible display panel 130. [ In another embodiment, the yellowish data YD may include a red color coordinate measured when red light is output to the flexible display panel 130, a green color coordinate measured when green light is output to the flexible display panel 130, And a blue color coordinate measured when blue light is output to the light source 130. The yellow compensation unit 110 detects the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB based on the difference between the preset initial data and the yellow data YD transmitted from the sensor 120 Can be output. At this time, the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB may be voltages for compensating the yellowing of the flexible display panel 130 of the flexible display device 100. [ The red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB output from the yellow compensation unit 110 are transmitted to the data driving unit 150 to generate a yellow compensation data signal have. In one embodiment, the sensor 120 may generate the yellowing data YD at a predetermined cycle. For example, the sensor 120 detects the yellowing of the flexible display panel 130 at intervals of one month to three months, generates yellowing data YD, and transmits the yellowing data YD to the yellowing compensation unit 110, ) Can be compensated for.

2, the yellowing compensation unit 110 may include a computing unit 112, a look-up table (LUT) 114, and a voltage generating unit 116. The initial data generated by the sensor 120 may be stored in the calculation unit 112 when the flexible display device 100 is initially driven. In one embodiment, the initial data may be a color coordinate measured by outputting white light to the flexible display panel 130 at the time of initial operation of the flexible display device 100. In another embodiment, the initial data is measured by outputting red light to the flexible display panel 130 and outputting green light to the flexible display panel 130, which is measured when the flexible display device 100 is initially driven A green color coordinate, and a blue color coordinate measured by outputting blue light to the flexible display panel 130. [ The operation unit 112 may calculate the difference between the preset initial data and the yellow data YD transmitted from the sensor 120. In one embodiment, the yellowing data YD may be a color coordinate measured by outputting white light to the flexible display panel 130 after the initial driving of the flexible display device 100. [ In an alternative embodiment, the yellowing data YD may be obtained by outputting red light to the flexible display panel 130 after the initialization of the flexible display device 100, outputting the red color coordinates measured, the green light to the flexible display panel 130 And a blue color coordinate which is measured by outputting blue light to the flexible display panel 130. [ The look-up table 114 may store red compensation data, green compensation data, and blue compensation data for compensating the difference between the yellowing data YD and the initial data. That is, the lookup table 114 may store red compensation data, green compensation data and blue compensation data for making the yellowing data YD equal to the initial data, based on the difference between the initial data and the yellowing data YD . At this time, the red compensation data, the green compensation data, and the blue compensation data may be predetermined values derived by experiments. The red compensation data, the green compensation data, and the blue compensation data can be retrieved from the look-up table 114 for red compensation data, green compensation data and blue compensation data corresponding to the difference between the initial data and the yellowing data YD, Section 116, as shown in FIG. The voltage generating unit 116 may generate the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB corresponding to the red compensation data, the green compensation data and the blue compensation data. The red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB may be transmitted to the data driving unit 150. The data driving unit 150 can generate the data signal based on the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB.

As described above, the flexible display device 100 includes the sensor 120 and the yellowing compensation unit 110, so that the yellowing of the flexible display panel 130, which occurs as the driving time of the flexible display device 100 elapses, Can be compensated. The yellowing compensation unit 110 may receive the yellowing data YD indicating the degree of yellowing of the flexible display panel 130 from the sensor 120 located on the flexible display panel 130. [ The arithmetic unit 112 of the yellowing compensation unit 110 may compare preset initial data with the yellowing data YD transmitted from the sensor 120. [ Green data, and blue compensation data for compensating the yellowing in the look-up table 114 based on the calculation result of the arithmetic unit 112, and may transmit the red compensation data, the green data, and the blue compensation data to the voltage generating unit 116. The voltage generation unit 116 generates the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB corresponding to the red compensation data, the green compensation data and the blue compensation data transmitted from the look- And transmits it to the data driving unit 150. The data driving unit 150 generates a data signal based on the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB transmitted from the yellowing compensation unit 110, ) Can be output to the flexible display panel (130) of the display panel (130).

3 is a plan view showing an example in which the flexible display device of FIG. 1 is provided with a yellow compensation unit.

Referring to FIG. 3, the flexible display device 200 may include a flexible display panel 230, a driving integrated circuit 250, and a flexible printed circuit board 240.

The driving integrated circuit 250 may include the scan driving unit 140 and the data driving unit 150 of FIG. The driving integrated circuit 250 may be mounted on the flexible display panel 230 in the form of an integrated circuit chip. The driving integrated circuit 250 is connected to the flexible printed circuit board 240 to generate a scan signal and a data signal corresponding to drive control signals transmitted from the flexible printed circuit board 240, Line. The flexible printed circuit board 240 may be connected to one end of the flexible display panel 230 to supply a drive control signal to the drive integrated circuit 250. The flexible printed circuit board 240 may include the timing control unit 170 of FIG. 1 mounted in the form of an integrated circuit chip.

In one embodiment, the yellowing compensation unit 210 may be located on a flexible printed circuit board 240. The yellowing compensation unit 210 may be mounted on the flexible printed circuit board 240 in the form of an integrated circuit chip. The sensor 220 may detect the degree of yellowing of the flexible display panel 230 and generate and transmit the yellowing data to the yellowing compensation unit 210. [ The sensor 220 may be located in any region of the flexible display panel 230. However, since the sensor 220 is formed on the flexible display panel 230, it may have a very small size or may be formed of a transparent material. The yellowing data detected by the sensor 220 may be transmitted to the yellowing compensation unit 210 mounted on the flexible printed circuit board 240. The yellow compensation unit 210 generates a red compensation voltage, a green compensation voltage and a blue compensation voltage capable of compensating the yellowing of the flexible display panel 230 based on the difference between the predetermined initial data and the yellowing data, (250). 3 includes one sensor 220 and one yellowing compensation unit 210, but the number of the sensor 220 and the yellowing compensation unit 210 is not limited thereto. For example, the flexible display device 200 includes a yellow display panel 230 divided into a plurality of areas and a yellowing compensation unit 210 connected to the sensor 220 and the sensor 220 for each area .

4 is a plan view showing another example in which the yellow display device of FIG. 1 is provided with a yellow compensation unit.

Referring to FIG. 4, the flexible display device 300 may include a flexible display panel 330, a driving integrated circuit 350, and a flexible printed circuit board 340.

The driving integrated circuit 350 may include the scan driving unit 140 and the data driving unit 150 of FIG. The driving integrated circuit 350 may be mounted on the flexible display panel 330 in the form of an integrated circuit chip. The driving integrated circuit 350 may generate a scan signal and a data signal corresponding to the drive control signals transmitted from the flexible printed circuit board 340 and supply the generated scan signals and data signals to the gate lines and the data lines, respectively. The flexible printed circuit board 340 may include the timing control unit 170 of Fig. 1 mounted in the form of an integrated circuit chip. The flexible printed circuit board 340 may be connected to one end of the flexible display panel 330 to supply a drive control signal to the drive integrated circuit 350. In one embodiment, the yellown compensation unit 310 may be located within the drive integrated circuit 350. The sensor 320 may detect the degree of yellowing of the flexible display panel and generate and transmit the yellowing data to the yellowing compensation unit 310 formed in the driving integrated circuit 350. [ The sensor 320 may be located in any region above the flexible display panel 330. However, since the sensor 320 is formed on the flexible display panel 330, the sensor 320 may have a very small size or may be formed of a transparent material. The yellowing data detected by the sensor 320 may be transmitted to the driving integrated circuit 350. [ The yellow compensation unit 310 located in the driving integrated circuit 350 is configured to detect a red compensation voltage, a green compensation voltage, and a blue compensation voltage that can compensate the yellowing of the flexible display panel 330 based on the difference between the predetermined initial data and the yellow data Voltage can be generated. 4 includes one sensor 320 and one yellowing compensation unit 310, but the number of the sensor 320 and the yellowing compensation unit 300 is not limited thereto. For example, the flexible display device 300 includes a yellow display panel 330 divided into a plurality of areas, and a yellowing compensation unit 310 connected to the sensor 320 and the sensor 320, .

5 is a plan view showing another example in which the flexible display device of FIG. 1 is provided with a yellow compensation unit.

5, the flexible display device 400 may include a flexible display panel 430, a driving integrated circuit 450, a flexible printed circuit board 440, and a control printed circuit board 460.

The driving integrated circuit 450 may include the scan driving unit 140 and the data driving unit 150 of FIG. The driving integrated circuit 450 may be mounted on the flexible display panel 430 in the form of an integrated circuit chip. The driving integrated circuit 450 may generate a scan signal and a data signal corresponding to the drive control signals transmitted from the flexible printed circuit board 440 and supply the generated scan signals and data signals to the gate lines and the data lines, respectively. The flexible printed circuit board 440 may include the timing control unit 170 of Fig. 1 mounted in the form of an integrated circuit chip. The flexible printed circuit board 440 may be connected to one end of the flexible display panel 430 to supply a drive control signal to the drive integrated circuit 450. The control printed circuit board 460 can supply a drive control signal to the drive integrated circuit 450 through the flexible printed circuit board 440. [ A plurality of drive circuits such as a control circuit and a common voltage circuit are mounted on the control printed circuit board 460 to generate a drive control signal and supply the drive control signal to the flexible printed circuit board 440.

In one embodiment, the yellowing compensation unit 410 may be located on the control printed circuit board 460. The yellowing compensation unit 410 may be mounted on the control printed circuit board 460 in the form of an integrated circuit chip. The sensor 420 may generate yellowing data indicating the degree of yellowing of the flexible display panel 430 and transmit the yellowing data to the yellowing compensation unit 410. [ The sensor 420 may be located in any area of the flexible display panel 430. [ However, since the sensor 420 is formed on the flexible display panel 430, it may have a very small size or be formed of a transparent material. The yellowing data detected by the sensor 420 may be transmitted to the yellowing compensation unit 410 mounted on the control printed circuit board 460. [ The yellow compensation unit 410 generates a red compensation voltage, a green compensation voltage and a blue compensation voltage capable of compensating the yellowing of the flexible display panel 430 based on the difference between the predetermined initial data and the yellowing data, (450). Although the flexible display device 400 of FIG. 5 includes one sensor 420 and one yellowing compensation unit 410, the number of the sensor 420 and the yellowing compensation unit 410 is not limited thereto. For example, the flexible display device 400 may include a yellowing compensation unit 410 that divides the flexible display panel 430 into a plurality of regions and is connected to the sensor 420 and the sensor 420 for each region .

6 is a flowchart illustrating a method of compensating for yellowing of a flexible display device according to an embodiment of the present invention.

Referring to FIG. 6, the yellowing compensation method of FIG. 6 generates yellowing data indicating the yellowing degree of the flexible display panel of the flexible display device (S10), and calculates the difference between the preset initial data and the yellowing data (S20) have. 6, the red compensation data, the green compensation data and the blue compensation data for compensating the difference between the initial data and the yellow data can be searched (S30) in the look-up table, and the red compensation data, And the red compensation voltage, the green compensation voltage, and the blue compensation voltage corresponding to the blue compensation data (S40). In one embodiment, the sensor may generate the yellowing data at a predetermined period. For example, the sensor can detect the yellowing of the flexible display panel at intervals of one month to three months, and generate yellowing data and transmit it to the yellowing compensation unit, thereby compensating for the yellowing of the flexible display panel.

Specifically, the yellowing compensation method of FIG. 6 can generate yellowing data indicating the yellowing degree of the flexible display panel (S10). Yellowing may occur over time in the flexible display panel of a flexible display made of a plastic substrate. By forming the sensor on the flexible display panel, the degree of yellowing of the flexible display panel can be detected and yellowing data can be generated. Since the sensor is formed on the flexible display panel, it can be formed of a very small or transparent material. The yellowing data detected by the sensor can be transferred to the yellowing compensation unit. In one embodiment, the yellowing data may be the color coordinates measured when the white light is output to the flexible display panel after the initial drive of the flexible display device. In another embodiment, the yellowing data may include a red color coordinate measured when the red light is output to the flexible display panel after the initial driving of the flexible display device, a green color coordinate measured when the green light is output to the flexible display panel, And a blue color coordinate measured when blue light is output.

The yellow compensation method of FIG. 6 can calculate the difference between the preset initial data and the yellow data (S20). The yellowing data detected by the sensor may be transmitted to the operation unit of the yellow compensation unit. The operation unit can store the initial data measured by the sensor when the flexible display device is initially driven. In one embodiment, the initial data may be a color coordinate measured by outputting white light to the flexible display panel at the time of initial operation of the flexible display device. In another embodiment, the initial data may include a red color coordinate measured by outputting red light to the flexible display panel at the time of initial operation of the flexible display device, a green color coordinate measured by outputting green light to the flexible display panel, And may include a blue color coordinate to be measured. The operation unit can calculate the difference between the initial data and the yellow data.

The yellow compensation method of FIG. 6 may search (S30) the red compensation data, the green compensation data, and the blue compensation data for compensating the difference between the yellow data and the initial data in the lookup table. The difference between the initial data calculated by the arithmetic unit and the yellow data can be transmitted to the lookup table. The look-up table may store red compensation data, green compensation data and blue compensation data for compensating the yellowing of the flexible display panel based on the difference between the initial data and the yellowing data. At this time, the red compensation data, the green compensation data, and the blue compensation data may be values derived by experiments. The red compensation data, the green compensation data and the blue compensation data for compensating the yellowing of the flexible display panel can be transmitted to the voltage generating unit.

6, the red compensation voltage, the green compensation voltage, and the blue compensation voltage corresponding to the red compensation data, the green compensation data, and the blue compensation data may be output (S40). The voltage generator may generate a red compensation voltage, a green compensation voltage, and a blue compensation voltage corresponding to the red compensation data, the green compensation data, and the blue compensation data. The red compensation voltage, the green compensation voltage and the blue compensation voltage may be transmitted to the data driving unit. The data driving unit may generate the data signal based on the red compensation voltage, the green compensation voltage, and the blue compensation voltage.

7 is a diagram showing an example in which the yellowing is compensated by the yellowing compensation method of FIG.

Referring to FIG. 7, the operation unit 520 of the yellow compensation unit may receive yellow data from the sensor. In one embodiment, the yellowing data may be the color coordinates measured by outputting white light to the flexible display panel after the initial drive of the flexible display device. The color coordinate, that is, the initial data, which is measured by outputting white light to the flexible display panel during the initial operation of the flexible display device, may be stored in the calculation unit 520. When the initial data stored in the operation unit 520 is referred to as a first color coordinate Wx1 and the first color coordinate Wx2 transmitted from the operation unit 520 is a second color coordinate Wx2, (Wx1, Wy1) - (Wx2, Wy2) of the second color coordinate can be calculated. In one embodiment, the look-up table 540 includes red compensation data DR, green data DG, and blue compensation data DR for correcting the difference between the first color coordinate and the second color coordinate ((Wx1, Wy1) - (Wx2, Wy2) And can store compensation data (DB). Specifically, the lookup table 540 stores the second color coordinates Wx2 and Wy2 on the basis of the difference between the first color coordinate and the second color coordinate ((Wx1, Wy1) - (Wx2, Wy2) The red compensation data DR, the green data DG and the blue compensation data DB which are to be changed so as to be the same as those of the red compensation data DR1, Wy1. For example, the red compensation data DR may be a red color coordinate, the green data DG may be a green color coordinate, and the blue compensation data DB may be a blue color coordinate. The red compensation data DR, the green data DG and the blue compensation data DB stored in the lookup table 540 may be predetermined values derived by experiments. The voltage generating unit 560 generates the red compensation voltage VR and the green compensation voltage VG corresponding to the red compensation data DR, the green data DG and the blue compensation data DB transmitted from the lookup table 540, And the blue compensation voltage VB. The red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB may be transmitted to the data driving unit. The data driving unit may generate the data signal based on the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB. Thus, by detecting the degree of yellowing of the flexible display panel at regular intervals, generating a data signal capable of compensating the yellowing, and outputting the data signal to the flexible display panel, the image in which the yellowing of the flexible display panel generated by the long- .

8 is a diagram showing another example in which the yellowing is compensated by the yellowing compensation method of FIG.

Referring to FIG. 8, the operation unit 620 of the yellow compensation unit can receive yellow data from the sensor. In one embodiment, the yellow color data is obtained by outputting red light to the flexible display panel after initial operation of the flexible display device, outputting green color coordinates measured by outputting green light, and blue color coordinates measured by outputting blue light, . In the initial operation of the flexible display device, the arithmetic unit 620 outputs red light to the flexible display panel to output a red color coordinate, a green color coordinate measured by outputting green light, and an initial Data can be stored. The initial data stored in the operation unit 620 is referred to as first red color coordinates Rx1 and Ry1, first green color coordinates Gx1 and Gy1 and first blue color coordinates Bx1 and By1, May be referred to as a second red color coordinate Rx2, Ry2, a second green color coordinate Gx2, Gy2, and a second blue color coordinate Bx2, By2. The calculation unit 620 calculates the difference ((Rx1, Ry1) - (Rx2, Ry2)) between the first red color coordinate and the second red color coordinate, (Bx1, By1) - (Bx2, By2) between the first blue color coordinate and the second blue color coordinate can be calculated. In one embodiment, the lookup table 640 includes red compensation data DR for correcting the difference ((Rx1, Ry1) - (Rx2, Ry2)) between the first red color coordinate and the second red color coordinate, (Bx1, By1) - (Bx2, By2 (Bx2, By2)) between the first blue color coordinate and the second blue color coordinate, the green data DG for correcting the difference of the second green color coordinates ((Gx1, Gy1) - (Gx2, Gy2) ) Of the blue compensation data DB. Specifically, the lookup table 640 stores the second red color coordinates Rx2 and Ry2 on the basis of the difference between the first red color coordinate and the second red color coordinate ((Rx1, Ry1) - (Rx2, Ry2) Red compensation data DR to be changed in order to make it equal to the color coordinates Rx1, Ry1 can be stored. For example, the red compensation data DR may be a red color coordinate. The lookup table 640 stores the second green color coordinates Gx2 and Gy2 on the basis of the difference between the first green color coordinate and the second green color coordinate ((Gx1, Gy1) - (Gx2, Gy2) Green data DG that should be changed to make it the same as Gy1 can be stored. For example, the green data DG may be a green color coordinate. The lookup table 640 stores the second blue color coordinates Bx2 and By2 in the first blue color coordinates Bx1 and Bx2 based on the difference between the first blue color coordinate and the second blue color coordinate ((Bx1, By1) - (Bx2, By2) By 1, the blue compensation data DB to be changed can be stored. For example, the blue compensation data DB may be a blue color coordinate. The red compensation data DR, green data DG and blue compensation data DB stored in the lookup table 640 may be predetermined values derived by experiment. The voltage generator 660 generates the red compensation voltage VR and the green compensation voltage VG corresponding to the red compensation data DR, the green data DG and the blue compensation data DB transmitted from the lookup table 640, And the blue compensation voltage VB. The red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB may be transmitted to the data driving unit. The data driving unit may generate the data signal based on the red compensation voltage VR, the green compensation voltage VG and the blue compensation voltage VB. Thus, by detecting the degree of yellowing of the flexible display panel at regular intervals, generating a data signal capable of compensating the yellowing, and outputting the data signal to the flexible display panel, the image in which the yellowing of the flexible display panel generated by the long- .

The present invention can be applied to all electronic devices having a flexible display device. For example, the present invention can be applied to a television, a computer monitor, a notebook, a digital camera, a mobile phone, a smart phone, a PDA, a PMP, an MP3 player, a navigation device,

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood that the invention may be modified and varied without departing from the scope of the invention.

100, 200, 300, 400: Flexible display device
110, 210, 310, 410: a yellow compensation unit
112, 520, 620: operation unit 114, 540, 640: lookup table
116, 560, 660: voltage generator 120, 220, 320, 420:
130, 230, 330, 430: display panel 140: scan drive unit
150: data driving unit 160: power unit
170: timing control unit 180: emission control unit
240, 340, 440: flexible circuit board 250, 350, 450: drive integrated circuit
460: Control printed circuit board

Claims (20)

A flexible display panel in which a plurality of pixels each having an organic light emitting diode are formed;
A scan driving unit for supplying a scan signal to the pixels;
A data driving unit for providing a data signal to the pixels;
A power unit for providing a high power source voltage and a low power source voltage to the pixels;
A timing control unit for controlling the scan driving unit, the data driving unit, and the power unit;
A sensor formed on the flexible display panel to generate yellowing data indicating the degree of yellowing of the flexible display panel; And
And a yellow compensation voltage, a green compensation voltage and a blue compensation voltage for compensating for the yellowing to the data driving unit based on a difference between the predetermined initial data and the yellowing data. The apparatus according to claim 1, wherein the yellow compensation unit
An arithmetic unit for calculating a difference between the initial data and the yellow data;
A look-up table for storing red compensation data, green compensation data and blue compensation data for compensating a difference between the initial data and the yellow data; And
And a voltage generator for generating a red compensation voltage corresponding to the red compensation data, a green compensation voltage corresponding to the green data, and a blue compensation voltage corresponding to the blue compensation data. The flexible display device according to claim 1, wherein the yellow compensation unit is located on a flexible printed circuit board connected to one end of the flexible display panel and supplying a drive control signal to the data drive unit and the scan drive unit. . The flexible display device according to claim 1, wherein the yellow compensation unit is located in the data driving unit. The display device according to claim 1, wherein the yellow compensation unit is located on a control printed circuit board for supplying a drive control signal to the data driving unit and the scan driving unit through a flexible printed circuit board connected to one end of the flexible display panel And a flexible display device. The flexible display device of claim 1, wherein the yellow data is generated at a predetermined cycle. The flexible display device according to claim 1, wherein the initial data is a first color coordinate measured by outputting white light to the flexible display panel during an initial operation of the flexible display device. The flexible display device according to claim 7, wherein the yellow color data is a second color coordinate measured by outputting the white light to the flexible display panel after the initial driving of the flexible display device. 9. The flexible display device according to claim 8, wherein the red compensation data, the green compensation data and the blue compensation data for compensating for a difference between the first color coordinate and the second color coordinate are stored in a look-up table. 2. The display device according to claim 1, wherein the initial data includes a first red color coordinate measured by outputting red light to the flexible display panel when the flexible display device is initially driven, a first red color coordinate measured by outputting green light to the flexible display panel, A green color coordinate, and a first blue color coordinate measured by outputting blue light to the flexible display panel. The display device according to claim 10, wherein the yellow data indicates a second red color coordinate measured by outputting the red light to the flexible display panel after the initial driving of the flexible display, and the green color light is output to the flexible display panel A second green color coordinate, and a second blue color coordinate measured by outputting the blue light to the flexible display panel. 12. The method of claim 11, further comprising: red compensation data for compensating for a difference between the first red color coordinate and the second red color coordinate; green data for compensating a difference between the first green color coordinate and the second green color coordinate; And blue compensation data for compensating a difference between the color coordinates and the second blue color coordinate is stored in a look-up table. Generating yellowing data indicating a degree of yellowing of a flexible display panel provided in the flexible display device;
Computing a difference between the initial data and the yellow data;
Searching in a look-up table for red compensation data, green compensation data and blue compensation data for compensating a difference between the initial data and the yellow data; And
And outputting a red compensation voltage corresponding to the red compensation data, a green compensation voltage corresponding to the green data, and a blue compensation voltage corresponding to the blue compensation data. 14. The method of claim 13, wherein the yellow data is generated at a predetermined cycle. 14. The method according to claim 13, wherein the initial data is a first color coordinate measured by outputting white light to the flexible display panel when the flexible display device is initially driven. 16. The method of claim 15, wherein the yellow level data is a second color coordinate measured by outputting the white light to the flexible display panel after the initial driving of the flexible display device. 17. The flexible display device according to claim 16, wherein the red compensation data, the green compensation data and the blue compensation data for compensating for a difference between the first color coordinate and the second color coordinate are stored in the lookup table. Compensation method. 14. The display device according to claim 13, wherein the initial data includes a first red color coordinate measured by outputting red light to the flexible display panel when the flexible display device is initially driven, a first red color coordinate measured by outputting green light to the flexible display panel, And a first blue color coordinate measured by outputting blue light to the flexible display panel. 19. The display device according to claim 18, wherein the yellow data indicates a second red color coordinate measured by outputting the red light to the flexible display panel after the initial driving of the flexible display, and the green light is output to the flexible display panel And a second blue color coordinate measured by outputting the blue light to the flexible display panel. 20. The method of claim 19, further comprising: red compensation data for compensating for a difference between the first red color coordinate and the second red color coordinate; green compensation data for compensating for a difference between the first green color coordinate and the second green color coordinate; And blue compensation data for compensating a difference between a color coordinate and a second blue color coordinate is stored in the lookup table.

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