KR102113125B1 - Flexible display device and method of compensating a yellowing for the same - Google Patents

Abstract

The flexible display includes a display panel, a scan driving unit, a data driving unit, a power unit, a timing control unit, a sensor, and a yellowing compensation unit. The yellowing compensation unit includes a calculation unit that calculates a difference between yellowing data and preset initial data, a lookup table and red compensation data for storing red compensation data, green compensation data, and blue compensation data to compensate for the difference between yellow data and initial data, And a voltage generator configured to generate a red compensation voltage, a green compensation voltage, and a blue compensation voltage corresponding to the green compensation data and the blue compensation data.

Description

Flexible display device and compensation method for yellowing thereof {FLEXIBLE DISPLAY DEVICE AND METHOD OF COMPENSATING A YELLOWING FOR THE SAME}

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

Recently, various flat panel display devices that can reduce weight and volume, which are disadvantages of a cathode ray tube (CRT), have been used. These flat panel display devices include liquid crystal display (LCD) devices, plasma display panel (PDP) devices, organic light emitting display (OLED) devices, quantum dot display devices, and electricity And electrophoresis display devices. In general, a flat panel display device is used in a fixed form, but recently, a flexible display device applicable to an e-book, an electronic paper, or the like has attracted attention.

A plastic material can be used as a substrate to implement a flexible display device. When a plastic material is used as the substrate, flexibility of the flexible display device can be improved, and 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 the flexible display panel provided in the flexible display device is discolored by ultraviolet rays may occur.

One object of the present invention is to provide a flexible display device capable of compensating for yellowing of the flexible display panel generated by long-time use.

Another object of the present invention is to provide a method for compensating for yellowing of a flexible display device capable of compensating for yellowing of a flexible display panel generated by long-time use.

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

In order to achieve one object of the present invention, the flexible display device according to embodiments of the present invention is a flexible display panel in which a plurality of pixels each having an organic light emitting diode is formed, and a scan signal to the pixels A scan driving unit providing a, a data driving unit providing a data signal to the pixels, a power unit providing a high power voltage and a low power voltage to the pixels, the scan driving unit, the data driving unit and the power unit Based on the difference between the initial data and the yellowing data, a timing control unit configured to control the sensor, the yellowing data formed on the flexible display panel to generate yellowing data indicating the degree of yellowing of the flexible display panel, the data driving unit It may include a yellow compensation unit that provides a red compensation voltage, a green compensation voltage, and a blue compensation voltage to compensate for yellowing.

According to an embodiment, the yellowing compensation unit may calculate a difference between the initial data and the yellowing data, a red compensation data, green compensation data, and blue compensation data to compensate for the difference between the initial data and the yellowing data. A lookup table to store and a red compensation voltage corresponding to the red compensation data, a green compensation voltage corresponding to the green data, and a voltage generator to generate a blue compensation voltage corresponding to the blue compensation data may be included.

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

According to an embodiment, the yellowing compensation unit may be located in the data driving unit.

According to an embodiment, the yellowing compensation unit may be located on a control printed circuit board that supplies driving control signals 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 yellowing 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 driving of the flexible display device.

According to an embodiment, the yellowing 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 that compensate for the difference between the first color coordinate and the second color coordinate may be stored in a lookup table.

According to an embodiment, the initial data is a first red color coordinate measured by outputting red light to the flexible display panel during initial driving of the flexible display device, and a first 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 may be included.

According to an embodiment, after the initial driving of the flexible display, the yellowing data is measured by outputting the red light to the flexible display panel and a second red color coordinate measured by 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 may be included.

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

In order to achieve another object of the present invention, a method for compensating for yellowing of a flexible display device according to embodiments of the present invention includes generating yellowing data indicating the degree of yellowing of a flexible display panel provided in the flexible display device, and a preset initial Computing a difference between data and the yellowing data, retrieving red compensation data, green compensation data and blue compensation data from a look-up table to compensate for the difference between the initial data and the yellowing data, and corresponding to the red compensation data And outputting a red compensation voltage, 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 yellowing 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 driving of the flexible display device.

According to an embodiment, the yellowing 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 that compensate for a difference between the first color coordinate and the second color coordinate may be stored in the lookup table.

According to an embodiment, the initial data is a first red color coordinate measured by outputting red light to the flexible display panel during initial driving of the flexible display device, and a first 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 may be included.

According to an embodiment, after the initial driving of the flexible display, the yellowing data is measured by outputting the red light to the flexible display panel and a second red color coordinate measured by 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 may be included.

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

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

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

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

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

Referring to 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, and a light emission control unit 180, a sensor 120, and a yellowing compensation unit 110.

The flexible display panel 130 may be formed by bonding a flexible substrate. The flexible display device 100 may use a plastic material such as polyethylene terephthalate (PET) or polyimide 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 the data signal supplied from the data lines DL1, ..., DLm to the driving transistor in response to the scan signal supplied from the scan lines SL1, ..., SLn, and the driving transistor The current flowing through the organic light emitting diode may be adjusted based on the data signal, and the organic light emitting diode may emit light based on the current. The scan driving unit 140 may supply a scan signal to pixels through a plurality of scan lines SL1, ..., SLn, and the data driving unit 150 may include a plurality of data lines DL1, according to the scan signal. ..., DLm) to supply data signals to pixels. In this case, the data signal may be generated 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. The light emission control unit 180 may supply a light emission control signal to pixels through a plurality of light emission control lines EL1, ..., ELn. The power unit 160 may provide a high voltage power supply ELVDD and a 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 color coordinates measured when white light is output to the flexible display panel 130. In another embodiment, the yellowing data YD includes red color coordinates measured when red light is output to the flexible display panel 130, green color coordinates measured when green light is output to the flexible display panel 130, and flexible display panel A blue color coordinate measured when blue light is output to the 130 may be included. The yellow compensation unit 110 sets 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 yellowing data YD transmitted from the sensor 120. Can print In this case, the red compensation voltage VR, the green compensation voltage VG, and the blue compensation voltage VB may be voltages that compensate for 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 data signal compensated for yellowing. have. In one embodiment, the sensor 120 may generate yellowing data YD at a predetermined period. For example, the sensor 120 detects yellowing of the flexible display panel 130 in a period of 1 to 3 months, generates yellowing data YD, and transmits the yellowing data YD to the yellowing compensation unit 110, thereby allowing the flexible display panel 130 ) Can compensate for yellowing.

Referring to FIG. 2, the yellowing compensation unit 110 may include an operation unit 112, a look-up table (LUT) 114, and a voltage generation unit 116. When the flexible display apparatus 100 is initially driven, the operation unit 112 may store initial data generated by the sensor 120. In one embodiment, the initial data may be color coordinates measured by outputting white light to the flexible display panel 130 when the flexible display apparatus 100 is initially driven. 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 when the flexible display apparatus 100 is initially driven. A green color coordinate and a blue color coordinate measured by outputting blue light to the flexible display panel 130 may be included. The calculator 112 may calculate a difference between the preset initial data and the yellowing data YD transmitted from the sensor 120. In one embodiment, the yellowing data YD may be color coordinates measured by outputting white light to the flexible display panel 130 after the initial driving of the flexible display device 100. In another embodiment, the yellowing data YD outputs red light to the flexible display panel 130 and outputs green light to the flexible display panel 130 after the initial driving of the flexible display device 100. The blue color coordinates measured by outputting blue light to the green color coordinates and the flexible display panel 130 are measured. In the look-up table 114, red compensation data, green compensation data, and blue compensation data for compensating the difference between the yellowing data YD and the initial data may be stored. That is, the lookup table 114 may store red compensation data, green compensation data, and blue compensation data to make the yellowing data YD the same as 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. In the look-up table 114, red compensation data, green compensation data, and blue compensation data corresponding to the difference between the initial data and yellowing data YD can be searched, and red compensation data, green compensation data, and blue compensation data generate voltage. It can be delivered to the unit 116. The voltage generator 116 may generate a red compensation voltage VR, a green compensation voltage VG, and a 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 may generate a 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 is provided with a sensor 120 and a yellowing compensation unit 110 so that yellowing of the flexible display panel 130 occurs as the driving time of the flexible display device 100 elapses Can compensate. The yellowing compensation unit 110 may receive 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 calculation unit 112 of the yellowing compensation unit 110 may compare the preset initial data with the yellowing data YD received from the sensor 120. Based on the calculation result of the calculation unit 112, the red compensation data, green data, and blue compensation data for compensating for yellowing in the look-up table 114 may be searched and transferred to the voltage generation unit 116. The voltage generator 116 receives red compensation data VR, green compensation voltage VG, and blue compensation voltage VB corresponding to red compensation data, green compensation data, and blue compensation data transmitted from the look-up table 114. It can be generated and transmitted 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, so that the flexible display device 100 ) May be output on the flexible display panel 130 of the yellowing compensated image.

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

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. 1. 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 scan signals and data signals corresponding to driving control signals transmitted from the flexible printed circuit board 240, respectively, and generates gate signals and data, respectively. Can be supplied in line. The flexible printed circuit board 240 may be connected to one end of the flexible display panel 230 to supply a driving control signal to the driving 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 the 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, generate yellowing data, and transmit the yellowing data to the yellowing compensation unit 210. The sensor 220 may be located in any area 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 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 yellowing compensation unit 210 generates a red compensation voltage, a green compensation voltage, and a blue compensation voltage capable of compensating for yellowing of the flexible display panel 230 based on a difference between the preset initial data and yellowing data. 250. The flexible display device 200 of FIG. 3 includes one sensor 220 and one yellow compensation unit 210, but the number of the sensor 220 and the yellow compensation unit 210 is not limited thereto. For example, the flexible display device 200 divides the flexible display panel 230 into a plurality of regions, and includes a yellowing compensation unit 210 connected to the sensor 220 and the sensor 220 for each region. Can be.

4 is a plan view illustrating another example in which the yellowing compensation unit is provided in the flexible display device of FIG. 1.

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. 1. 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 scan signals and data signals corresponding to driving control signals transmitted from the flexible printed circuit board 340 and supply them to the gate line and the data line, 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 driving control signal to the driving integrated circuit 350. In one embodiment, the yellowing compensation unit 310 may be located within the driving integrated circuit 350. The sensor 320 may detect the degree of yellowing of the flexible display panel, generate yellowing data, 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, it may have a very small size or may be formed of a transparent material. The yellowing data detected by the sensor 320 may be transferred to the driving integrated circuit 350. The yellowing compensation unit 310 located in the driving integrated circuit 350 compensates for the yellowing of the flexible display panel 330 based on the difference between the preset initial data and the yellowing data. The red compensation voltage, the green compensation voltage, and the blue compensation Voltage can be generated. The flexible display device 300 of FIG. 4 includes one sensor 320 and one yellow compensation unit 310, but the number of the sensor 320 and the yellow compensation unit 300 is not limited thereto. For example, the flexible display device 300 divides the flexible display panel 330 into a plurality of regions, and includes a sensor 320 and a yellowing compensation unit 310 connected to the sensor 320 for each region. Can be.

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

Referring to FIG. 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. 1. 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 scan signals and data signals corresponding to driving control signals transmitted from the flexible printed circuit board 440 and supply them 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 driving control signal to the driving integrated circuit 450. The control printed circuit board 460 may supply a driving control signal to the driving integrated circuit 450 through the flexible printed circuit board 440. A plurality of driving circuits, such as a control circuit and a common voltage circuit, are mounted on the control printed circuit board 460 to generate a driving control signal and supply the driving 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 may 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 yellowing compensation unit 410 generates a red compensation voltage, a green compensation voltage, and a blue compensation voltage capable of compensating for yellowing of the flexible display panel 430 based on a difference between the preset initial data and yellowing data. (450). The flexible display device 400 of FIG. 5 includes one sensor 420 and one yellow compensation unit 410, but the number of the sensor 420 and the yellow compensation unit 410 is not limited thereto. For example, the flexible display apparatus 400 may divide the flexible display panel 430 into a plurality of regions, and may include a sensor 420 and a yellowing compensation unit 410 connected to the sensors 420 for each region. .

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

Referring to FIG. 6, the yellowing compensation method of FIG. 6 may generate yellowing data indicating the degree of yellowing of the flexible display panel of the flexible display device (S10), and calculate a difference between preset initial data and yellowing data (S20). have. Subsequently, in the yellowing compensation method of FIG. 6, red compensation data, green compensation data, and blue compensation data for compensating the difference between the initial data and yellowing data may be searched in the lookup table (S30), and red compensation data and green compensation data And a red compensation voltage, a green compensation voltage, and a blue compensation voltage corresponding to the blue compensation data (S40). In one embodiment, the sensor may generate yellowing data at a predetermined period. For example, the sensor may compensate for yellowing of the flexible display panel by detecting yellowing of the flexible display panel in a period of 1 to 3 months, and generating yellowing data and transmitting the yellowing data to the yellowing compensation unit.

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

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

In the yellowing compensation method of FIG. 6, red compensation data, green compensation data, and blue compensation data for compensating the difference between yellow data and initial data may be searched in the lookup table (S30). The difference between the initial data and yellowing data calculated by the operation unit may be transferred to a lookup table. The lookup table may store red compensation data, green compensation data, and blue compensation data for compensating for yellowing of the flexible display panel based on a difference between initial data and yellowing data. At this time, the red compensation data, the green compensation data, and the blue compensation data may be values derived by experiment. Red compensation data, green compensation data, and blue compensation data for compensating for yellowing of the flexible display panel may be transmitted to a voltage generator.

The yellow compensation method of FIG. 6 may output 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 (S40). The voltage generator may generate red compensation voltage, green compensation voltage, and blue compensation voltage corresponding to red compensation data, green compensation data, and 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 a data signal based on the red compensation voltage, the green compensation voltage, and the blue compensation voltage.

7 is a diagram illustrating an example in which yellowing is compensated by the yellowing compensation method of FIG. 6.

Referring to FIG. 7, the calculation unit 520 of the yellowing compensation unit may receive yellowing data from a sensor. In one embodiment, the yellowing data may be color coordinates measured by outputting white light to the flexible display panel after the initial driving of the flexible display device. When the flexible display device is initially driven, a color coordinate, that is, initial data, measured by outputting white light to the flexible display panel may be stored in the operation unit 520. When the initial data stored in the calculation unit 520 is referred to as a first color coordinate (Wx1, Wy1), and yellowing data transmitted to the calculation unit 520 is referred to as a second color coordinate (Wx2, Wy2), the calculation unit 520 and the first color coordinate The difference of the second color coordinates ((Wx1, Wy1)-(Wx2, Wy2)) can be calculated. In one embodiment, the look-up table 540 includes red compensation data DR, green data DG, and blue that corrects a difference ((Wx1, Wy1)-(Wx2, Wy2)) between the first color coordinate and the second color coordinate. Reward data DB may be stored. Specifically, the look-up table 540 based on the difference between the first color coordinates and the second color coordinates ((Wx1, Wy1)-(Wx2, Wy2)), the second color coordinates Wx2, Wy2 are the first color coordinates Wx1, Wy1), red compensation data DR, green data DG, and blue compensation data DB that need to be changed may be stored. 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 look-up table 540 may be predetermined values derived by experiments. The voltage generator 560 includes a red compensation voltage VR and a 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 a 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 a data signal based on the red compensation voltage VR, the green compensation voltage VG, and the blue compensation voltage VB. As described above, by detecting the degree of yellowing of the flexible display panel at regular intervals, and generating a data signal capable of compensating for yellowing and outputting the data signal to the flexible display panel, an image compensated for yellowing of the flexible display panel generated by long-time use is output. Can be.

8 is a diagram illustrating another example in which yellowing is compensated by the yellowing compensation method of FIG. 6.

Referring to FIG. 8, the calculation unit 620 of the yellowing compensation unit may receive yellowing data from a sensor. In one embodiment, after the initial driving of the flexible display device, the yellowing data may include a red color coordinate measured by outputting red light to a flexible display panel, a green color coordinate measured by outputting green light, and a blue color coordinate measured by outputting blue light. It can contain. When the flexible display device is initially driven, the operation unit 620 includes a red color coordinate measured by outputting red light to a flexible display panel, a green color coordinate measured by outputting green light, and a blue color coordinate measured by outputting blue light. Data can be stored. The initial data stored in the calculation unit 620 are referred to as first red color coordinates (Rx1, Ry1), first green color coordinates (Gx1, Gy1), and first blue color coordinates (Bx1, By1), and yellowing data transmitted to the calculation unit 620 Can be referred to as second red color coordinates (Rx2, Ry2), second green color coordinates (Gx2, Gy2), and second blue color coordinates (Bx2, By2). The calculation unit 620 is the difference between the first red color coordinate and the second red color coordinate ((Rx1, Ry1)-(Rx2, Ry2)), the difference between the first green color coordinate and the second green color coordinate ((Gx1, Gy1)-(Gx2 , Gy2)) and the difference between the first blue color coordinate and the second blue color coordinate ((Bx1, By1)-(Bx2, By2)). In one embodiment, the lookup table 640 includes red compensation data DR that corrects a difference ((Rx1, Ry1)-(Rx2, Ry2)) between the first red color coordinate and the second red color coordinate, and the first green color coordinate. Green data (DG) correcting the difference between the second green color coordinates ((Gx1, Gy1)-(Gx2, Gy2)) and the difference between the first blue color coordinate and the second blue color coordinate ((Bx1, By1)-(Bx2, By2 )) May be stored. Specifically, the lookup table 640 is based on the difference between the first red color coordinate and the second red color coordinate ((Rx1, Ry1)-(Rx2, Ry2)), and the second red color coordinates (Rx2, Ry2) are the first red. Red compensation data DR that needs to be changed to be the same as the color coordinates Rx1 and Ry1 may be stored. For example, the red compensation data DR may be a red color coordinate. The look-up table 640 is based on the difference between the first green color coordinate and the second green color coordinate ((Gx1, Gy1)-(Gx2, Gy2)), the second green color coordinates (Gx2, Gy2) as the first green color coordinate (Gx1, Green data (DG) that needs to be changed to make it the same as Gy1) may be stored. For example, the green data DG may be green color coordinates. The look-up table 640 uses the second blue color coordinates (Bx2, By2) as the first blue color coordinates (Bx1, Blue compensation data DB to be changed may be stored in order to make it the same as By1). For example, 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 look-up table 640 may be predetermined values derived by experiments. The voltage generator 660 includes a red compensation voltage (VR) and a green compensation voltage (VG) corresponding to the red compensation data (DR), green data (DG), and blue compensation data (DB) transmitted from the lookup table 640. And a 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 a data signal based on the red compensation voltage VR, the green compensation voltage VG, and the blue compensation voltage VB. As described above, by detecting the degree of yellowing of the flexible display panel at regular intervals, and generating a data signal capable of compensating for yellowing and outputting the data signal to the flexible display panel, an image compensated for yellowing of the flexible display panel generated by long-time use is output. Can be.

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 laptop, a digital camera, a mobile phone, a smartphone, a PDA (PDA), a PMP, an MP3 player, navigation, and a video phone.

In the above, it has been described with reference to exemplary embodiments of the present invention, but those skilled in the art may vary the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that it can be modified and changed.

100, 200, 300, 400: flexible display device
110, 210, 310, 410: yellowing compensation unit
112, 520, 620: operation unit 114, 540, 640: lookup table
116, 560, 660: voltage generator 120, 220, 320, 420: sensor
130, 230, 330, 430: display panel 140: scan drive unit
150: data drive unit 160: power unit
170: timing control unit 180: light emission control unit
240, 340, 440: flexible circuit board 250, 350, 450: driving 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 is formed;
A scan driving unit that provides a scan signal to the pixels;
A data driving unit that provides a data signal to the pixels;
A power unit providing high power voltage and low power voltage to the pixels;
A timing control unit 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
A flexible display device comprising a yellow compensation unit that provides a red compensation voltage, a green compensation voltage, and a blue compensation voltage to compensate the yellowing to the data driving unit based on a difference between the preset initial data and the yellowing data. The method of claim 1, wherein the yellowing compensation unit
A calculation unit calculating a difference between the initial data and the yellowing data;
A look-up table that stores red compensation data, green compensation data, and blue compensation data for compensating the difference between the initial data and the yellowing data; And
And a voltage generator configured to generate a red compensation voltage corresponding to the red compensation data, a green compensation voltage corresponding to the green compensation data, and a blue compensation voltage corresponding to the blue compensation data. The flexible display device of claim 1, wherein the yellowing compensation unit is located on a flexible printed circuit board connected to one end of the flexible display panel to supply driving control signals to the data driving unit and the scan driving unit. . The flexible display device of claim 1, wherein the yellowing compensation unit is located in the data driving unit. The method according to claim 1, wherein the yellowing compensation unit is located on a control printed circuit board that supplies driving control signals 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. Flexible display device characterized by. The flexible display device of claim 1, wherein the yellowing data is generated at a predetermined period. The flexible display device of claim 1, 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. The flexible display device of claim 7, wherein the yellowing 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. The flexible display device of claim 8, wherein red compensation data, green compensation data, and blue compensation data that compensate for a difference between the first color coordinate and the second color coordinate are stored in a lookup table. The method of claim 1, wherein the initial data is a first red color coordinate measured by outputting red light to the flexible display panel during initial driving of the flexible display device, and a first measured by outputting green light to the flexible display panel. A flexible display device comprising a green color coordinate and a first blue color coordinate measured by outputting blue light to the flexible display panel. The method of claim 10, wherein the yellowing data is measured by outputting the green light to the flexible display panel and a second red color coordinate measured by outputting the red light to the flexible display panel after the initial driving of the flexible display. A flexible display device comprising 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, Red compensation data to compensate for the difference between the first red color coordinate and the second red color coordinate, Green data to compensate for the difference between the first green color coordinate and the second green color coordinate, and the first blue A flexible display device, wherein blue compensation data that compensates for a difference between a color coordinate and the second blue color coordinate is stored in a look-up table. Generating yellowing data indicating a degree of yellowing of the flexible display panel provided in the flexible display device;
Calculating a difference between the preset initial data and the yellowing data;
Retrieving red compensation data, green compensation data, and blue compensation data from a look-up table to compensate for the difference between the initial data and the yellowing data; And
And outputting a red compensation voltage corresponding to the red compensation data, a green compensation voltage corresponding to the green compensation data, and a blue compensation voltage corresponding to the blue compensation data. The method of claim 13, wherein the yellowing data is generated at a predetermined period. 15. The method of 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 yellowing 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. The yellow compensation of the flexible display device according to claim 16, wherein the red compensation data, the green compensation data and the blue compensation data that compensate for the difference between the first color coordinate and the second color coordinate are stored in the look-up table. Reward method. The first red color coordinate measured by outputting red light to the flexible display panel during the initial driving of the flexible display device, and the first data measured by outputting green light to the flexible display panel. A yellow color compensation method of a flexible display device comprising a green color coordinate and a first blue color coordinate measured by outputting blue light to the flexible display panel. The method of claim 18, wherein the yellowing data is measured by outputting the green light to the flexible display panel and 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 a second blue color coordinate measured by outputting the blue light to the second green color coordinate and the flexible display panel. 20. The method of claim 19, Red compensation data to compensate for the difference between the first red color coordinate and the second red color coordinate, Green compensation data to compensate for the difference between the first green color coordinate and the second green color coordinate and the first blue The blue compensation data for compensating the difference between a color coordinate and the second blue color coordinate is stored in the look-up table.

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