KR20140086509A - Curved flat display device and method for driving the same - Google Patents

Abstract

The present invention relates to a curved flat panel display device, capable of improving image display quality and reliability by performing correction without distorting a correlated color temperature according to a viewing angle of the curved flat panel display device, and to a method for driving the same. The curved flat panel display device according to the present invention comprises a curved display panel which includes a plurality of pixel regions; a power supply unit which applies first and second power signals to power lines of the curved display panel; and a driving integrated circuit which stores a center color temperature correction coefficient and upper/lower color temperature correction coefficients of the curved display panel, autonomously converts a gamma voltage level by using the center and upper/lower color temperature correction coefficients, so as to convert digital image data to an analog data voltage such that the correlated color temperature is compensated according to a display position, and displays an image on the curved display panel according to the data voltage in which the correlated color temperature is compensated.

Description

TECHNICAL FIELD [0001] The present invention relates to a curved flat panel display device and a method of driving the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a curved flat panel display device and a driving method thereof, which can improve image display quality and reliability by correcting a corelated color temperature so as not to be distorted according to a viewing angle of a curved flat panel display .

BACKGROUND ART [0002] Recently, flat panel displays that are emerging include liquid crystal displays (LCDs), field emission displays, plasma display panels, and organic light emitting diodes Emitting Diode Display). Among them, organic light emitting diode (OLED) display devices are applied to mobile communication devices such as smart phones and tablet pads because they have high brightness, low driving voltage and can be made ultra thin.

Each of the plurality of pixels constituting the organic light emitting diode display device includes an OLED (Organic Light Emitting Diode) pixel composed of an organic light emitting layer between the anode and the cathode, a pixel circuit for independently driving each OLED pixel, And a drive control circuit. The organic light emitting diode display device converts digital data into analog image signals (current or voltage signals) using gradation-specific gamma voltages, supplies the converted image signals to the respective pixel circuits, Is displayed.

In recent years, it is easy to apply an organic light emitting diode display device using a self-luminous element to a curved flat panel display device. Therefore, such an organic light emitting diode display device is mainly developed as a curved flat panel display device. However, since the conventional flat panel display device, which is manufactured in a curved shape, has a larger viewing angle change than a general flat panel display device, there arises a problem that the displayed color characteristics are recognized differently according to the change of the viewing angle. Accordingly, in the case of the curved flat panel display devices, techniques for preventing the correlated color temperature from being recognized due to the viewing angle are recognized and applied, unlike a general flat panel display device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a curved surface type flat panel display capable of improving the image display quality and reliability by correcting the Correlated Color Temperature A flat panel display device and a driving method thereof are provided.

According to another aspect of the present invention, there is provided an OLED display including: a curved display panel having a plurality of pixel regions; A power supply unit for applying first and second power supply signals to power supply lines of the curved display panel; The central color temperature correction coefficient and the upper / lower color temperature correction coefficient of the curved display panel are respectively stored, and the gamma voltage level is converted by using the central part and the upper and lower color temperature correction coefficients, And a driving integrated circuit for converting an analog data voltage so as to compensate for the correlated color temperature according to the correlation color temperature and displaying an image based on the data voltage compensated for the correlated color temperature on the curved display panel.

Wherein the driving integrated circuit controls the driving timing of the gate and data lines of the curved display panel, sets a gamma voltage level, aligns the digital video data to be driven for driving the curved display panel, A control unit for generating correction data for correcting the gamma voltage level according to a horizontal line display position of the digital image data by interpolation using a center color temperature correction coefficient of the curved display panel and an upper / And generating a gamma voltage set by subdividing the reference gamma voltage so as to correspond to the gradation values of the digital image data in response to the gamma selection signal from the timing controller, The voltage of the gamma voltage set And a digital-to-analog conversion circuit for converting the digital image data of one horizontal line into an analog data voltage by using a gamma voltage set modulated in units of at least one horizontal line, And a second electrode.

The gamma voltage controller may include correction coefficients for correcting a gamma voltage level according to a display position of the digital image data for each of an upper end portion and a lower end portion of the curved display panel using the interpolation method shown in Equations 1 and 2 Generating the correction data,

[Equation 1]

Upper end correction data Idata = GM- (GM-CM) 占 each horizontal line / (B 占 2)

&Quot; (2) "

The lower end correction data Idata = CM- (GM-CM) x each horizontal line / (B x 2)

The GM is a central color temperature correction coefficient, the CM is an upper / lower color temperature correction coefficient, and B is the total number of horizontal lines (or horizontal line resolution).

Wherein the correction data includes correction coefficients for converting an average voltage level, a maximum voltage level, or at least a gamma voltage level of the gamma voltage set, and the correction coefficients become larger the closer to the upper and lower ends of the curved display panel, The degree of compensation of the digital image data displayed at the upper and lower ends is increased and the degree of compensation of the color temperature of digital image data displayed closer to the center portion is made smaller .

The gamma voltage controller receives and stores the center color temperature correction coefficient and the upper and lower color temperature correction coefficients of the curved display panel for each of red, green, and blue, Green and blue color correction data for correcting the gamma voltage levels of red, green and blue according to the display positions of the digital image data according to the horizontal lines by an interpolation method using the upper and lower color temperature correction coefficients, .

According to another aspect of the present invention, there is provided a method of driving an organic light emitting diode display, including: applying first and second power signals to power lines of a curved display panel; The central color temperature correction coefficient and the upper / lower color temperature correction coefficient of the curved display panel are respectively stored, and the gamma voltage level is converted by using the central part and the upper and lower color temperature correction coefficients, To an analog data voltage such that the correlated color temperature is compensated for in accordance with the data signal; And displaying an image based on the analog data voltage compensated for by the correlated color temperature on the curved display panel.

Wherein the step of converting the digital image data into an analog data voltage to compensate for the correlated color temperature includes the steps of setting a gamma voltage level and arranging and outputting the digital image data to be suitable for driving the curved display panel, Generating and outputting correction data for correcting the gamma voltage level according to a horizontal line display position of the digital image data by interpolation using a temperature correction coefficient and an upper / lower color temperature correction coefficient, Generating a set of gamma voltages by subdividing the reference gamma voltages so as to correspond to the gradation values of the digital image data, modulating and outputting the voltage levels of the gamma voltage sets in units of at least one horizontal line according to the correction data, And at least one horizontal line modulated and input And converting the digital image data of one horizontal line into an analog data voltage using the set gamma voltage.

The step of generating and outputting the correction data may be performed such that the gamma voltage level is corrected according to the display position of the digital image data for the upper and lower ends of the curved display panel using the interpolation method shown in the following Equations 1 and 2 Said correction data generating means generates said correction data,

[Equation 1]

Upper end correction data Idata = GM- (GM-CM) 占 each horizontal line / (B 占 2)

&Quot; (2) "

The lower end correction data Idata = CM- (GM-CM) x each horizontal line / (B x 2)

The GM is a central color temperature correction coefficient, the CM is an upper / lower color temperature correction coefficient, and B is the total number of horizontal lines (or horizontal line resolution).

Wherein the correction data includes correction coefficients for converting an average voltage level, a maximum voltage level, or at least a gamma voltage level of the gamma voltage set, and the correction coefficients become larger the closer to the upper and lower ends of the curved display panel, The degree of compensation of the digital image data displayed at the upper and lower ends is increased and the degree of compensation of the color temperature of digital image data displayed closer to the center portion is made smaller .

Wherein the step of generating and outputting the correction data includes receiving and storing the center color temperature correction coefficient and the upper and lower color temperature correction coefficients of the curved display panel for each of red, green, and blue, And color temperature correction coefficients for red, green, and blue according to the display positions of the digital image data according to the horizontal lines by an interpolation method using the color temperature correction coefficient and the upper / And generating and outputting data.

According to an exemplary embodiment of the present invention, a curved surface flat panel display and a driving method thereof may convert a gamma voltage level according to a display position of digital image data to convert the digital image data into an analog It can be converted into a data voltage. In this way, the image display quality and reliability can be improved by correcting the correlated color temperature so as not to be distorted according to the viewing angle of the curved flat panel display.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an apparatus for correcting color temperature of a curved organic light emitting diode display apparatus according to an embodiment of the present invention; FIG.
FIG. 2 is a schematic view of the curved organic light emitting diode display device and the color temperature correction device shown in FIG. 1. FIG.
Fig. 3 is a configuration diagram specifically showing the driving integrated circuit shown in Fig. 1. Fig.
4 is a graph for explaining a correction data generating method of the gamma voltage controller shown in FIG.
5A to 5C are graphs for explaining a method of generating correction data of the gamma voltage controller shown in FIG.

Hereinafter, a curved flat panel display device and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

A flat panel display device applicable to a curved flat panel display device includes a liquid crystal display, a field emission display, a plasma display panel, and an organic light emitting diode display device Organic Light Emitting Diode Display) or the like can be applied. Hereinafter, an example in which the organic light emitting diode display device is applied to a curved flat panel display device will be described.

FIG. 1 is a circuit diagram showing a color temperature correction apparatus of a curved surface type organic light emitting diode display according to an embodiment of the present invention. Referring to FIG. 2 is a block diagram schematically showing the curved organic light emitting diode display device and the color temperature correction device shown in FIG.

As shown in FIGS. 1 and 2, a curved organic light emitting diode display device includes a curved display panel 1 having a plurality of pixel regions; A power supply unit 4 for applying first and second power supply signals VDD and GND to the power supply lines PLn to PLm of the curved display panel; The central portion color temperature correction coefficient GM and the upper and lower end portion color temperature correction coefficients CM of the curved display panel 1 are stored and the gamma voltage (RGB) is converted into an analog data voltage so that the correlated color temperature is compensated in accordance with the display position, and the image with the data voltage compensated by the correlated color temperature is applied to the curved display panel 1 (Not shown).

Here, the driving integrated circuit 2 receives and stores the central portion and the upper / lower-end color temperature correction coefficients GM and CM of the curved display panel 1 from the color temperature correction device. 2, the color temperature correction apparatus includes a color temperature detection section 5 for detecting the color temperature of the central portion of the curved display panel 1 and the color temperature of the upper and lower ends, respectively, The color temperature correction coefficients GM and CM of the central portion and the upper and lower end portions of the curved display panel 1 are set in accordance with the color temperature CTn of each position, And a control unit 4. Here, the center color temperature correction coefficient GM and the upper / lower-end color temperature correction coefficient CM are the average voltage level or the maximum voltage level of the gamma voltage set and generated in the drive integrated circuit 2, It is a coefficient for converting the level.

In the image display panel 1, a plurality of subpixels P are arranged in a matrix form in each pixel region to display an image. Each subpixel P includes an organic light emitting diode (OLED) And a diode driving circuit for independently driving the light emitting diodes. More specifically, one subpixel P is a diode driver circuit connected to a gate line GL, a data line DL, and a power supply line PL, and between the diode drive circuit and the second power supply signal GND And a light emitting diode connected thereto. Here, the diode driving circuits supply the analog video signals from the data lines DL1 to DLm connected to the organic light emitting diodes, respectively, so that the supplied analog video signals are charged to maintain the light emitting state.

The drive integrated circuit 2 itself generates at least one synchronization signal to generate gate control signals for driving the gate lines GL1 to GLn and uses it to generate a gate-on signal (e.g., a low or high The gate voltage of the logic) sequentially. And controls the pulse width of the gate-on signal to sequentially supply the gate-on signals to the gate lines GL1 to GLn. Here, a gate-off voltage (gate voltage of high logic, for example) is supplied during a period in which no gate-on voltage is supplied to the gate lines GL1 to GLn. Accordingly, the drive integrated circuit 2 causes the diode drive circuits connected to the gate lines GL1 to GLn to be driven in units of the gate lines GL.

The driving integrated circuit 2 stores the central portion and the upper and lower color temperature correction coefficients GM and CM of the curved display panel 1 supplied from the color temperature correction device. Correction data for correcting the gamma voltage level for each display position of the image data RGB is generated by interpolation using the center color temperature correction coefficient GM and the upper and lower color temperature correction coefficients CM. Thus, the driving integrated circuit 2 converts the gamma voltage level for each display position of the digital image data (RGB) according to the correction data, so that the correlated color temperature of the digital image data (RGB) is compensated according to the display position, Voltage. The analog data voltages thus converted are supplied to the respective data lines DL1 to DLm by one horizontal line every one horizontal period. The driving integrated circuit 2 according to the present invention will be described later in detail with reference to the drawings.

The power supply unit 3 supplies the first power supply signal VDD and the second power supply signal GND to the image display panel 1. [ Here, the first power supply signal VDD denotes a driving voltage for driving the light emitting diodes, and the second power supply signal GND denotes a ground voltage or a low voltage. The current corresponding to the video signal flows in each sub-pixel P due to the difference between the first power source signal VDD and the second power source signal GND.

3 is a configuration diagram specifically showing the driving integrated circuit shown in Fig.

The driving integrated circuit 2 shown in FIG. 3 controls the driving timings of the gate and data lines GL1 to GLn and DL1 to DLm, sets the gamma voltage level, A timing control section 21 for aligning and outputting in accordance with the driving of the type display panel 1 and an interpolation method using the center color temperature correction coefficient GM of the curved display panel 1 and the upper and lower color temperature correction coefficients CM A gamma voltage control unit 28 for generating and outputting correction data Idata for correcting the gamma voltage level according to the display position of the digital image data RGB in the horizontal line, VREG) to generate a gamma voltage set by subdividing the reference gamma voltage so as to correspond to each of the gradation values of the digital image data (RGB) A gamma voltage generating unit 26 for modulating and outputting the voltage level of the set of digital image data RData for one horizontal line by using gamma voltage sets MV0 to MV255 modulated in at least one horizontal line unit, And a digital-analog converter (DAC) 25 for converting the analog data voltage AData into an analog data voltage AData.

The drive integrated circuit 2 further includes a gate driver 22 for sequentially supplying a gate-on signal Vscan to the gate lines GL1 to GLn in accordance with the gate control signal GCS from the timing controller 21, A shift register 23 for outputting a sampling signal SAM in response to a source start pulse SSP and a source shift clock SSC from the control unit 21, SAM), sequentially supplies the source output signal (SOE) and the image data (Data) from the timing controller 21 and supplies the sampled data (DData) And an output buffer 27 for amplifying the analog data voltage AData from the DAC 25 and supplying the amplified analog data voltage AData to the data lines DL1 to DLm, Respectively.

The timing controller 21 generates a gate control signal GCS and a source shift clock SSC and a source start pulse SSP and a source output enable signal SOE to generate gate and data lines GL1 to GLn and DL1 To DLm.

The shift register 23 generates the sampling signal SAM using the source shift clock SSC and the source start pulse SSP from the timing controller 21. [ Specifically, the shift register 23 generates the sampling signal SAM by shifting the source start pulse SSP in accordance with the source shift clock SSC and sequentially supplies the sampled signal SAM to the latch unit 24.

The latch section 24 sequentially samples the video data Data supplied from the timing control section 21 in accordance with the sampling signal SAM from the shift register 23. Then, the sampled data is stored in units of one line, and the latched image data (DData) for one line stored in response to the source output enable signal SOE is simultaneously output to the DAC 25.

The gamma voltage control unit 28 controls the gamma voltage control unit 28 to display the display position of the digital image data RGB in the horizontal line by interpolation using the center color temperature correction coefficient GM of the curved display panel 1 and the upper / And generates and outputs correction data (Idata) for correcting the gamma voltage level according to the correction data (Idata). Here, the center color temperature correction coefficient GM and the upper / lower-end color temperature correction coefficient CM are coefficients for converting the average voltage level or the maximum voltage level of the gamma voltage set or at least one of the gamma voltage levels. The gamma voltage controller 28 controls the gamma voltage level to be corrected by the interpolation method using the center and upper and lower color temperature correction coefficients GM and CM, ). Therefore, the correction coefficients included in the correction data (Idata) are set in units of horizontal lines. The technical features of the gamma voltage controller 28 and the method of generating the correction data (Idata) will be described later in detail with reference to the accompanying drawings.

The gamma voltage generator 26 generates a plurality of reference gamma voltages in a divided mode between resistors serially connected between a preset maximum and minimum reference gamma voltages when the gamma selection signal VREG is input , And generates a gamma voltage set by subdividing the generated reference gamma voltages into a plurality of divided voltage modes corresponding to the gradation values of the digital image data RGB. Then, the voltage level of the gamma voltage set is modulated and outputted in units of at least one horizontal line in accordance with the correction data (Idata) from the gamma voltage control unit (28). At this time, the gamma voltage sets (MV0 to MV255) output according to the correction data (Idata) generated by the interpolation method are set so that the correlated color temperature of the digital image data (RGB) is compensated in accordance with the display position of each horizontal line, Respectively.

The DAC 24 includes a gamma voltage set MV0 to MV255 input in at least one horizontal line unit from the gamma voltage generator 26, that is, a gamma voltage set MV0 to MV255) to convert the digital data signal (RData) into analog image data (AData).

The output buffer 27 amplifies the analog image data AData to prevent the data voltage AData from the DAC 25 from being distorted according to the RC time constant of the data lines DL1 to DLm, (VS) to each of the data lines DL1 to DLm.

4 is a graph for explaining a correction data generating method of the gamma voltage controller shown in FIG.

The gamma voltage controller 28 controls the gamma voltage level (gamma voltage level) according to the display position of the digital image data (RGB) for the upper and lower ends of the curved display panel 1 using the interpolation method shown in the following Equations 1 and 2, And generates correction data (Idata) including correction coefficients to be corrected.

[Equation 1]

Upper end correction data Idata = GM- (GM-CM) 占 each horizontal line / (B 占 2)

&Quot; (2) "

The lower end correction data Idata = CM- (GM-CM) x each horizontal line / (B x 2)

Here, GM is the center color temperature correction coefficient, and CM is the upper / lower end color temperature correction coefficient. And B is the total number of horizontal lines (or horizontal line resolution).

The gamma voltage controller 28 controls the gamma voltage level to be corrected according to the display position of the digital image data RGB by using the interpolation method shown in Equations 1 and 2 for the upper and lower ends of the curved display panel 1, And generates and outputs coefficients, i.e., correction data (Idata).

Correction coefficients for correcting the gamma voltage level, i.e., the correction data Idata, are coefficients for converting the average voltage level or the maximum voltage level of the gamma voltage set or at least one of the gamma voltage levels.

The correction data Idata generated by interpolation according to Equations (1) and (2) are set so that the correction coefficient increases as the position approaches the upper and lower ends as shown in FIG. 4, and decreases as the position approaches the center. Accordingly, the degree of color temperature compensation of the digital image data displayed at the upper and lower ends becomes larger, and the degree of color temperature compensation of the digital image data displayed closer to the center portion becomes smaller.

FIGS. 5A to 5C are graphs illustrating other methods for generating correction data of the gamma voltage controller shown in FIG.

The gamma voltage controller 28 receives and stores the center color temperature correction coefficient GM and upper and lower color temperature correction coefficients CM of the curved display panel 1 for each of red, green, and blue, , The gamma voltage levels of red, green, and blue according to the display position of the digital image data (RGB) in the horizontal direction are calculated by interpolation using the color temperature correction coefficient (GM) of the blue center and the color temperature correction coefficient (CM) (R_Idata, G_Idata, B_Idata) for red, green, and blue, respectively, to be corrected.

The gamma voltage controller 28 controls the gamma voltage controller 28 to display the red, green, and blue image data RGB at the upper and lower ends of the curved display panel 1 using the interpolation method shown in Equations (1) and (2) Green, and blue correction data (R_Idata, G_Idata, B_Idata) including correction coefficients for correcting the gamma voltage level.

The correction data Idata for correcting the gamma voltage level, that is, the correction data Idata for each of the red, green, and blue colors, may be used to convert the average gamma voltage level or the maximum gamma voltage level or at least one gamma voltage level of each of red, Lt; / RTI > The correction coefficients R_Idata, G_Idata, and B_Idata of the red, green, and blue colors generated by the interpolation method according to Equations 1 and 2 become closer to the center as the closer to the upper and lower ends, respectively, as shown in FIGS. 5A to 5C The correction coefficient is set to be smaller. Accordingly, the degree of compensation of the color temperature of the digital image data displayed at the upper and lower ends increases, and the degree of compensation of the color temperature of the digital image data displayed closer to the center portion becomes smaller.

As described above, the curved-surface flat panel display device and the driving method thereof according to the embodiment of the present invention can reduce the color temperature correction coefficients (GM, CM) of the central portion and the upper and lower end positions according to the display position of the digital image data ) To convert the gamma voltage level to convert the digital image data RGB to an analog data voltage so that the correlated color temperature is compensated. In this way, the image display quality and reliability can be improved by correcting the correlated color temperature so as not to be distorted according to the viewing angle of the curved flat panel display.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

Claims (10)

A curved display panel formed with a plurality of pixel regions;
A power supply unit for applying first and second power supply signals to power supply lines of the curved display panel;
The central color temperature correction coefficient and the upper / lower color temperature correction coefficient of the curved display panel are respectively stored, and the gamma voltage level is converted by using the central part and the upper and lower color temperature correction coefficients, And a driving integrated circuit for converting an analog data voltage so as to compensate the correlated color temperature according to the correlation color temperature and displaying an image of the data voltage compensated for the correlated color temperature on the curved surface display panel. Display device. The method according to claim 1,
The drive integrated circuit
A timing controller for controlling the driving timing of the gate and data lines of the curved display panel, setting a gamma voltage level, aligning the digital image data for driving the curved display panel,
An interpolation method using the center color temperature correction coefficient of the curved display panel and the upper and lower color temperature correction coefficients generates and outputs correction data for correcting the gamma voltage level according to the display position of the digital image data in each horizontal line Gamma voltage controller,
Generating a gamma voltage set by subdividing a reference gamma voltage so as to correspond to the gradation values of the digital image data in response to the gamma selection signal from the timing controller, A gamma voltage generating section for modulating and outputting a voltage level of
And a digital-to-analog conversion unit for converting the digital image data of one horizontal line into analog data voltages using a gamma voltage set modulated in units of at least one horizontal line and outputting the analog data voltages. . 3. The method of claim 2,
The gamma voltage controller
The correction data including the correction coefficients for correcting the gamma voltage level according to the display position of the digital image data for the upper and lower ends of the curved display panel is generated using the interpolation method shown in Equations 1 and 2 below In addition,
[Equation 1]
Upper end correction data Idata = GM- (GM-CM) 占 each horizontal line / (B 占 2)
&Quot; (2) "
The lower end correction data Idata = CM- (GM-CM) x each horizontal line / (B x 2)
Wherein GM is a center color temperature correction coefficient, CM is an upper / lower color temperature correction coefficient, and B is a total number of horizontal lines (or a horizontal line resolution). The method of claim 3,
The correction data
Correction coefficients for converting an average voltage level or a maximum voltage level or at least one gamma voltage level of the gamma voltage set,
Wherein the correction coefficients are set to be larger as the center of the curved display panel is closer to the upper and lower ends of the curved display panel and the correction coefficients are set smaller as the center of the curved display panel is closer to the central portion, And the color temperature compensation degree of the digital image data displayed close to the center portion is made smaller. The method of claim 3,
The gamma voltage controller
The center color temperature correction coefficient and the upper / lower color temperature correction coefficient of the curved display panel are supplied and stored for each of red, green, and blue, respectively,
And a color temperature correction unit for correcting gamma voltage levels of red, green, and blue according to the display position of each of the horizontal and vertical lines of the digital image data by an interpolation method using the red, green, and blue center temperature correction coefficients and the upper / Green, and blue, respectively, based on the correction data. Applying first and second power supply signals to power supply lines of a curved display panel;
The central color temperature correction coefficient and the upper / lower color temperature correction coefficient of the curved display panel are respectively stored, and the gamma voltage level is converted by using the central part and the upper and lower color temperature correction coefficients, To an analog data voltage such that the correlated color temperature is compensated for in accordance with the data signal; And
And displaying an image based on the analog data voltage in which the correlated color temperature is compensated, on the curved surface display panel. The method according to claim 6,
The step of converting the correlated color temperature to an analog data voltage to compensate
Setting a gamma voltage level, aligning and outputting the digital image data according to driving of the curved display panel,
An interpolation method using the center color temperature correction coefficient of the curved display panel and the upper and lower color temperature correction coefficients generates and outputs correction data for correcting the gamma voltage level according to the display position of the digital image data in each horizontal line step,
Generating a set of gamma voltages by subdividing a reference gamma voltage so as to correspond to the gradation values of the digital image data in response to the gamma selection signal and outputting a voltage level of the gamma voltage set in at least one horizontal line unit according to the correction data Modulating and outputting
Converting the digital image data of one horizontal line into an analog data voltage by using a gamma voltage set which is modulated and input in at least one horizontal line unit, and outputting the analog data voltage. 8. The method of claim 7,
The step of generating and outputting the correction data
The correction data including the correction coefficients for correcting the gamma voltage level according to the display position of the digital image data for the upper and lower ends of the curved display panel is generated using the interpolation method shown in Equations 1 and 2 below In addition,
[Equation 1]
Upper end correction data Idata = GM- (GM-CM) 占 each horizontal line / (B 占 2)
&Quot; (2) "
The lower end correction data Idata = CM- (GM-CM) x each horizontal line / (B x 2)
Wherein GM is a central color temperature correction coefficient, CM is an upper / lower color temperature correction coefficient, and B is a total number of horizontal lines (or a horizontal line resolution). . 9. The method of claim 8,
The correction data
Correction coefficients for converting an average voltage level or a maximum voltage level or at least one gamma voltage level of the gamma voltage set,
Wherein the correction coefficients are set to be larger as the center of the curved display panel is closer to the upper and lower ends of the curved display panel and the correction coefficients are set smaller as the center of the curved display panel is closer to the central portion, Wherein a color temperature compensation degree of the digital image data displayed close to the center portion is made smaller. 8. The method of claim 7,
The step of generating and outputting the correction data
The center color temperature correction coefficient and the upper / lower color temperature correction coefficient of the curved display panel are supplied and stored for each of red, green, and blue, respectively,
And a color temperature correction unit for correcting gamma voltage levels of red, green, and blue according to the display position of each of the horizontal and vertical lines of the digital image data by an interpolation method using the red, green, and blue center temperature correction coefficients and the upper / Green, and blue, respectively, based on the correction data.

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