KR102352613B1 - Display device and driving method of the same - Google Patents

Abstract

The present invention relates to a display device and a driving method of the display device, and more particularly, to a display device for converting red, green, blue and white data, and a driving method of the display device, and to the red, green, blue and white parts A display panel including a plurality of pixels composed of pixels and a data converter for converting initial red, green, and blue data into red, green, blue, and white final data, wherein the data converter includes a white color of a central pixel among the plurality of pixels Red, green, blue, and white final data output to the central pixel is calculated based on the distance between the sub-pixel and the red, green, and blue sub-pixels of a plurality of peripheral pixels adjacent to the central pixel.
In the present invention, the brightness of red light, green light, blue light, and white light can be adjusted so that dark lines are not generated according to the boundary pattern, so that even when a specific boundary pattern is implemented, dark lines generated by increasing the distance between sub-pixels may not be recognized.

Description

DISPLAY DEVICE AND DRIVING METHOD OF THE SAME

The present invention relates to a display device and a method of driving a display device, and more particularly, to a display device for converting red, green, blue and white data, and a driving method of the display device.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. Accordingly, various flat panel displays (FPDs) capable of reducing weight and volume, which are disadvantages of cathode ray tubes, have recently been developed and marketed. For example, various display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting diode (OLED) are being used.

A display panel of a display device includes a plurality of pixels defined by gate lines and data lines. A display device displays an image using a gate driver supplying a gate voltage to the gate lines and a data driver supplying a data voltage to the data lines. The display device controls operation timings of the gate driver and the data driver using the timing controller. The data driver converts digital image data supplied from the timing controller into an analog data voltage under the control of the timing controller and outputs the converted digital image data.

The digital image data supplied to the data driver includes red data, green data, and blue data. The data driver converts red data into a red data voltage, green data into a green data voltage, and blue data into a blue data voltage, and supplies the converted data to a plurality of pixels of the display panel. Each pixel of the display panel includes a red sub-pixel to which a red data voltage is supplied, a green sub-pixel to which a green data voltage is supplied, and a blue sub-pixel to which a blue data voltage is supplied. The red subpixel of the display panel includes a red color filter to emit red light, the green subpixel includes a green color filter to emit green light, and the blue subpixel includes a blue color filter to emit blue light. The display panel displays white light by mixing red light, green light, and blue light.

In addition, each of the plurality of pixels of the recent display panel further includes a white sub-pixel. Since the white sub-pixel does not require a color filter, the transmittance is relatively higher than that of the red, green, and blue sub-pixels. Accordingly, when each of the pixels of the display panel includes red, green, blue, and white sub-pixels, the red, green, and blue light output from each of the red, green, and blue sub-pixels is reduced due to the white light output from the white sub-pixel. can be reduced

However, when a plurality of pixels include red, green, blue, and white sub-pixels, the distance between sub-pixels of the same color becomes greater than when the plurality of pixels include only red, green, and blue sub-pixels. Accordingly, when the display panel implements a specific boundary pattern, a dark line generated by an increase in the distance between sub-pixels is recognized by the viewer. That is, in the case of a display device in which a plurality of pixels include red, green, blue, and white sub-pixels, the ability to implement a specific boundary pattern is deteriorated, resulting in a problem in that image quality is lowered.

Accordingly, the problem to be solved by the present invention is to obtain red, green, blue and white final data output to the central pixel based on the distance between the white subpixel of the central pixel and the red, green, and blue subpixels of a plurality of peripheral pixels. It is an object of the present invention to provide a display device with improved boundary pattern implementation ability and a driving method thereof.

The problems of the present invention are not suggested as the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, a display device according to an embodiment of the present invention provides a display panel including a plurality of pixels including red, green, blue, and white sub-pixels and red, green, and blue initial data in red. , green, blue and white final data, the data conversion unit includes a distance between the white sub-pixel of the central pixel among the plurality of pixels and the red, green, and blue sub-pixels of the plurality of peripheral pixels adjacent to the central pixel. Based on , red, green, blue, and white final data output to the central pixel are calculated.

In order to solve the above problems, a method of driving a display device according to an embodiment of the present invention includes an intermediate data generating step of generating red, green, blue, and white intermediate data from red, green, and blue initial data, and and an intermediate data correction step of calculating red, green, blue, and white final data from the green, blue, and white intermediate data, wherein the intermediate data correction step includes a white sub-pixel of a central pixel among a plurality of pixels and a plurality of adjacent pixels. Red, green, blue, and white final data output to the central pixel is calculated based on the distance between the red, green, and blue sub-pixels of the neighboring pixels of .

Details of other embodiments are included in the detailed description and drawings.

In the present invention, the brightness of red light, green light, blue light, and white light can be adjusted so that dark lines are not generated according to the boundary pattern, so that even when a specific boundary pattern is implemented, dark lines generated by increasing the distance between sub-pixels may not be recognized.

That is, the present invention can improve the image quality by improving the implementation capability for a specific boundary pattern.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a schematic block diagram illustrating a display device according to an exemplary embodiment.
2 is a circuit diagram illustrating a pixel of a display device according to an exemplary embodiment.
3 is a diagram for explaining a pixel structure of a display device according to an exemplary embodiment.
4 is a block diagram illustrating a data conversion unit of a display device according to an exemplary embodiment.
5 to 7 are diagrams for explaining driving of a display device according to various embodiments of the present disclosure.
8 is a flowchart illustrating a method of driving a display device according to an exemplary embodiment.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, cases including the plural are included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

Like reference numerals refer to like elements throughout.

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, and as those skilled in the art will fully understand, technically various interlocking and driving are possible, and each embodiment may be implemented independently of each other, It may be possible to implement together in a related relationship.

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

1 is a schematic block diagram illustrating a display device according to an exemplary embodiment.

Referring to FIG. 1 , a display device 100 according to an embodiment of the present invention includes a display panel 110 , a data driver 120 , a gate driver 130 , a timing controller 140 , and a data converter 150 . includes

The display panel 110 includes a plurality of gate lines GL and a plurality of data lines DL that are intersected in a matrix form on a substrate made of glass or plastic. In addition, a plurality of pixels Px are defined by a plurality of gate lines GL and data lines DL.

In addition, the plurality of pixels Px of the display panel 110 are respectively connected to the gate line GL and the data line DL. The plurality of pixels Px operate based on the gate voltage transmitted from the gate line GL and the data voltage transmitted from the data line DL.

2 is a circuit diagram illustrating a pixel of a display device according to an exemplary embodiment.

Specifically, the driving of each pixel Px will be described with reference to FIG. 2 as follows. First, the switching transistor ST is turned on by the gate voltage supplied to the gate line GL of each pixel Px. Then, the data voltage Vdata is supplied from the data line DL to the driving transistor DT by the turned-on switching transistor ST, and the driving transistor DT is turned on. _{In addition, the driving current I OLED} is controlled by the data voltage Vdata applied to the turned-on driving transistor DT. Finally, the organic light emitting diode OLED displays an image by emitting light corresponding to the _{controlled driving current I OLED .}

As described above, the display device 100 according to an exemplary embodiment is not limited to an organic light emitting display device, and may be a display device of various types such as a liquid crystal display device.

3 is a diagram for explaining a pixel structure of a display device according to an exemplary embodiment.

As shown in FIG. 3 , each of the pixels Px of the display panel 110 includes a red sub-pixel SP _{R emitting red light, a green sub-pixel SP G} emitting green light, and a blue sub-pixel emitting blue light. It includes a pixel SP _B and a white sub-pixel SP _W emitting white light.

Specifically, the red sub-pixel SP _R of the display panel 110 includes a red color filter to emit red light, and the green sub-pixel SP _G includes a green color filter to emit green light, and a blue sub-pixel (SP _B ) includes a blue color filter to emit blue light, and the white sub-pixel (SP _W ) emits white light without filtering the color filter.

In addition, _{the size of the white subpixel SP W} is larger than the size of the red subpixel SP _R , the green subpixel SP _G , and the blue subpixel SP _B . As shown in FIG. 3 , when it is assumed that the vertical lengths of the _{red sub-pixel SP R} , the green sub-pixel SP _G , the blue sub-pixel SP _B , and the white sub-pixel SP _{W are the same, white} The horizontal length of the sub-pixel SP _W is longer than the horizontal length of the red sub-pixel SP _R , the green sub-pixel SP _G , and the blue sub-pixel SP _B . _{In this way, by setting the size of the white sub-pixel (SP W} ) having high transmittance without a color filter to be large, the output from the red sub-pixel (SP _R ), the green sub-pixel (SP _G ), and the blue sub-pixel (SP _B ) is Red light, green light and blue light can be reduced. Accordingly, data voltages output to the red sub-pixel SP _R , the green sub-pixel SP _G , and the blue sub-pixel SP _B may be reduced, thereby reducing the overall power consumption of the display device 100 . have.

In addition, in order to prevent color mixing, the sub-pixels SP _R , SP _{G ,} SP _{B and} SP _W are spaced apart from each other by a predetermined interval. Referring to FIG. 3 , in each of the plurality of pixels Px, a red sub-pixel SP _R , a white sub-pixel SP _W , a green sub-pixel SP _G , and a blue sub-pixel SP _B are sequentially arranged from the left. are placed In addition, the red subpixel SP _R and the white subpixel SP _W are spaced apart by a first distance L1 , and the white subpixel SP _W and the green subpixel SP _G are also spaced apart by the first distance L1 ), and the green sub-pixel SP _G and the blue sub-pixel SP _B are also spaced apart by the first distance L1. Further, the other side facing in the red sub-pixel (SP _R) and green sub-pixels (SP _G) arranged on the outermost side of the outermost side and a plurality of pixels (Px) of the plurality of pixels (Px) is a second distance ( L2) is spaced apart.

As described above, the shape of the sub-pixels SP _R , SP _G , SP _B , and SP _W disposed in the pixel Px has been described as a rectangular shape, but is not limited thereto, and a polygonal shape such as a triangular shape or a pentagonal shape. , may have a circular shape and an elliptical shape. In addition, although _{the colors of the sub-pixels SP R} , SP _G , SP _B , and SP _{W have been} described by limiting them to red, green, blue, and white, it is not limited thereto, and the colors of the sub-pixels are magenta, yellow ( yellow), cyan, etc. may be of various colors.

The data converter 150 converts red, green, and blue initial data (Ri, Gi, Bi) received from an external host system into red, green, blue, and white final data (Rf, Gf, Bf, Wf) do. A more detailed data conversion unit 150 will be described later.

The timing controller 140 supplies a data control signal DCS to the data driver 120 to control the data driver 120 , and supplies a gate control signal GCS to the gate driver 130 to control the gate driver 130 . to control

The timing controller 140 starts the scan according to the timing implemented in each frame based on the timing signal TS received from the external host system. In addition, the timing controller 140 adapts the final data Rf, Gf, Bf, and Wf of red, green, blue, and white received from the data converter 150 to a data signal format that can be processed by the data driver 120 . switch to output. Accordingly, the timing controller 140 controls data driving at an appropriate time according to the scan.

The timing controller 140 may include a vertical sync signal Vsync, a vertical sync signal Hsync, a data enable signal (DE), a data clock signal DCLK, etc. together with the image signal VS. The timing signals TS are received from an external host system.

The timing controller 140 controls the data driver 120 and the gate driver 130 , a vertical synchronization signal Vsync, a vertical synchronization signal Hsync, a data enable signal DE, and a data clock signal DCLK. It receives the timing signal TS such as, etc., generates various control signals DCS and GCS, and outputs them to the data driver 120 and the gate driver 130 .

For example, the timing controller 140 controls the gate driver 130 , a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (Gate Output). Various gate control signals (GCS) including Enable (GOE) and the like are output.

Here, the gate start pulse controls the operation start timing of one or more gate circuits constituting the gate driver 130 . The gate shift clock is a clock signal commonly input to one or more gate circuits and controls shift timing of a scan signal (gate pulse). The gate output enable signal specifies timing information of one or more gate circuits.

In addition, the timing controller 140 controls the data driver 120 , a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (Source Output Enable; Various data control signals (DCS) including SOE) are output.

Here, the source start pulse controls the data sampling start timing of one or more data circuits constituting the data driver 120 . The source sampling clock is a clock signal that controls the sampling timing of data in each of the data circuits. The source output enable signal controls the output timing of the data driver 120 .

The timing controller 140 is a control connected to the source printed circuit board to which the data driver 120 is bonded through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). It may be disposed on a printed circuit board (Control Printed Circuit Board).

The gate driver 130 sequentially supplies the gate voltage to the gate line GL under the control of the timing controller 140 .

The gate driver 130 may be positioned on only one side of the display panel 110 or, in some cases, on both sides, depending on a driving method.

The gate driver 130 is connected to a bonding pad of the display panel 110 by a Tape Automated Bonding (TAB) method or a Chip On Glass (COG) method, or a gate (GIP) method. In Panel) type and may be disposed directly on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases.

The gate driver 130 may include a shift register, a level shifter, and the like.

The data driver 120 converts the final data Rf, Gf, Bf, and Wf of red, green, blue, and white received from the timing controller 140 into an analog data voltage Vdata to form a data line DL. output to

The data driver 120 may be connected to a bonding pad of the display panel 110 by a tape automated bonding method or a chip-on-glass method or may be directly disposed on the display panel 110 , and in some cases, the display panel 110 . It may be integrated and arranged in

Also, the data driver 120 may be implemented in a Chip On Film (COF) method. In this case, one end of the data driver 120 may be bonded to at least one source printed circuit board, and the other end may be bonded to the display panel 110 .

The data driver 120 may include a logic unit including various circuits such as a level shifter and a latch unit, a digital analog converter (DAC), an output buffer, and the like.

In addition, it is disposed on the control printed circuit board, and supplies various voltages or currents to the display panel 110, the data driver 120, the gate driver 130, etc. or may further include a power controller for controlling various voltages or currents to be supplied. can The power control unit may be referred to as a power management integrated circuit (PMIC).

Hereinafter, a data conversion unit of a display device according to an embodiment of the present invention will be described in detail with reference to FIG. 4 .

4 is a block diagram illustrating a data conversion unit of a display device according to an exemplary embodiment.

As shown in FIG. 4 , the data conversion unit 150 includes an inverse gamma unit 151 , an intermediate data generator 152 , an intermediate data corrector 153 , and a gamma unit 154 .

The inverse gamma unit 151 linearizes initial data (Ri, Gi, Bi) of red, green, and blue input in frame units by de-gamma correction, and linearizes the initial data of red, green, and blue. The data Ri, Gi, and Bi are supplied to the intermediate data generating unit 152 .

Here, since grayscales and luminance of the initial data Ri, Gi, and Bi of red, green, and blue have a linear relationship, the grayscales of the initial data Ri, Gi, and Bi of green and blue may be expressed as relative luminance. Similarly, since the grayscale and luminance of the intermediate (Rm, Gm, Bm, Wm) and final data (Rf, Gf, Bf, Wf) are also linearly related, the intermediate (Rm, Gm, Bm, Wm) and final data (Rf) , Gf, Bf, Wf) can also be expressed as relative luminance. Accordingly, in the following, the grayscale representations of the initial data (Ri, Gi, Bi), intermediate data (Rm, Gm, Bm, Wm), and final data (Rf, Gf, Bf, Wf) are expressed as relative luminance values of 0 to 1. It is explained by substituting a value.

The intermediate data generator 152 receives the red, green, blue, and white intermediate data Rm, Gm from the linearized red, green, and blue initial data Ri, Gi, Bi, which are supplied in units of frames from the inverse gamma unit 151 . , Bm, Wm).

The intermediate data generator 152 calculates red, green, blue, and white intermediate data Rm, Gm, Bm, and Wm according to Equation 1 .

[Equation 1]

Wm = MIN (Ri, Gi, Bi)

Rm = Ri - Wm

Gm = Gi - Wm

Bm = Bi - Wm

Here, MIN[a, b, c] means a minimum value among a, b, and c values.

Specifically, the intermediate data generator 152 sets the white intermediate data Wm to the lowest value among the red, green, and blue initial data Ri, Gi, and Bi, and sets the red intermediate data Rm to the red initial data ( Ri) is set as the difference between the white intermediate data (Wm), the green intermediate data (Gm) is set as the difference between the green initial data (Gi) and the white intermediate data (Wm), and the blue intermediate data (Bm) is set as the blue initial data ( Bi) and white intermediate data (Wm).

That is, the common data values of red, green, and blue initial data (Ri, Gi, Bi) are set as white intermediate data (Wm) values, and red, green, and blue initial data (Ri, Gi, Bi) values and The difference between the above-described common data values is set as red, green, and blue intermediate data (Rm, Gm, Bm) values.

Accordingly, by additionally generating the white intermediate data Wm, the red intermediate data Rm, the green intermediate data Gm, and the blue intermediate data Bm may be reduced. Accordingly, a data voltage for outputting the red intermediate data Rm, the green intermediate data Gm, and the blue intermediate data Bm may be reduced, thereby reducing overall power consumption of the display device 100 .

The intermediate data corrector 153 converts the red, green, blue, and white intermediate data Rm, Gm, Bm, and Wm applied from the intermediate data generator 152 to the red, green blue and white final data Rf, Gf, Bf, Wf).

The intermediate data corrector 153 calculates red, green, blue, and white final data Rf, Gf, Bf, and Wf according to Equation (2).

[Equation 2]

Wf = (1-δ) * Wm

Rf = Rm + δ * Wm

Gf = Gm + δ * Wm

Bf = Bm + δ * Wm

Here, δ is a correction coefficient, and a setting method for the correction coefficient δ will be described later.

Specifically, the intermediate data correction unit 153 sets the white final data Wf as a product of the white intermediate data Wm and (1 - the correction coefficient δ), and sets the red final data Rf as the red intermediate data (Rm) is set by adding the product of the white intermediate data (Wm) and the correction coefficient (δ), and the green final data (Gf) is the green intermediate data (Gm), the product of the white intermediate data (Wm) and the correction coefficient (δ) It is set by adding, and the blue final data Bf is set by adding the product of the white intermediate data Wm and the correction coefficient δ to the blue intermediate data Bm.

That is, the intermediate data correction unit 153 subtracts the product of the white intermediate data (Wm) and the correction coefficient (δ) from the white intermediate data (Wm) for the white final data (Wf), and the red, green and blue final data (Rf, Gf, Bf) is set by adding the product of the red, green, and blue intermediate data (Rm, Gm, Bm) to the white intermediate data (Rm, Gm, Bm, Wm) and the correction coefficient (δ).

In addition, the correction coefficient δ is set to the maximum value among the plurality of correction coefficients δ calculated according to Equation 3 based on each of the plurality of neighboring pixels (side).

[Equation 3]

δ = 0.5 * { Wm(center) - Wm(side) } * MAX[ λr * { Rm(center) - Rm(side) }, λg * { Gm(center) - Gm(side) }, λb * { Bm (center) - Bm(side) }

λr = distance{SP _W (center), SP _R (side)} / MAX[distance{SP _W (center), SP _R (side)}, distance{SP _W (center), SP _G (side)}, distance {SP _W (center), SP _B (side)}]

λg = distance{SP _W (center), SP _G (side)} / MAX[distance{SP _W (center), SP _R (side)}, distance{SP _W (center), SP _G (side)}, distance {SP _W (center), SP _B (side)}]

λb = distance{SP _W (center), SP _B (side)} / MAX[distance{SP _W (center), SP _R (side)}, distance{SP _W (center), SP _G (side)}, distance {SP _W (center), SP _B (side)}]

Here, the center pixel means a pixel Px to which the red, green, blue, and white final data Rf, Gf, Bf, and Wf calculated by the data conversion unit 150 are output, and a plurality of The peripheral pixel (side) means a plurality of pixels Px adjacent to the center pixel (center).

And, Rm(center), Gm(center), Bm(center), and Wm(center) are red, green, blue, and white intermediate data output to the center pixel, and Rm(side), Gm(side) , Bm(side), and Wm(side) are red, green, blue, and white intermediate data output to each of a plurality of peripheral pixels, and SP _{R, G, B, W} (center) is a central pixel (center) means the subpixel of SP _R,G,B,W (side) denotes a sub-pixel of a neighboring pixel (side), and distance{SP _W (center), SP _R,G,B,W (side)} denotes a white sub-pixel SP _W (center) of the central pixel (center). ) and the other side of the red, green, and blue sub-pixels (SP _{R, G, B} (side)) of the neighboring pixels (side) facing the same, and MAX[a, b, c ] means the maximum value among a, b, and c values.

Accordingly, λr, λb, and λg are the white sub-pixel (SP _W (center)) of the central pixel (center) and the red, green, and blue sub-pixels (SP _{R, G, B} (side)) of the peripheral pixel (side) of the maximum distance between the distance between _{the white sub-pixel (SP W} (center)) of the central pixel (center) and the red, green, and blue sub-pixels (SP _{R, G, B (side)) of the neighboring pixels (side).} means the ratio.

5 to 7 are diagrams for explaining driving of a display device according to various embodiments of the present disclosure.

Hereinafter, an operation of the intermediate data corrector 153 of the display device according to an exemplary embodiment will be described with reference to FIGS. 5 to 7 .

5 to 7 , a plurality of peripheral pixels (side) are adjacent to a central pixel (center). For convenience of description, only a left peripheral pixel (left) disposed to the left of the center pixel (center) and a right peripheral pixel (right) disposed to the right of the center pixel (center) are considered for the plurality of peripheral pixels (side). However, the present invention is not limited thereto, and peripheral pixels in vertical and diagonal directions may be further included.

In addition, the aforementioned first distance L1 is set to 1, the second distance L2 is set to 0.5, and horizontal lengths L _{R ,} L _{G , of the red subpixel, the green subpixel, and the blue subpixel are set to} All L _B ) are set to 2, and the horizontal length (L _W ) of the white sub-pixel is set to 3.

In an embodiment of the present invention, as shown in FIG. 5 , the white intermediate data Wm of the center pixel is 1, and the red, green, and blue intermediate data Rm, Gm, and Bm are 0. . In addition, the red intermediate data Rm of the left peripheral pixel is 1, the green and blue intermediate data Rm, Gm, and Bm are 0, and the white intermediate data Wm of the right peripheral pixel right is 1, and the intermediate data Rm, Gm, and Bm of red, green, and blue are 0.

First, if the correction coefficient δ is calculated based on the right peripheral pixel, the difference between the white intermediate data Wm of the right peripheral pixel and the white intermediate data Wm of the center pixel is 0. Therefore, according to Equation 3, the correction coefficient δ based on the right peripheral pixel is 0.

Next, when the correction coefficient δ is calculated based on the left peripheral pixel, the difference between the white intermediate data Wm of the left peripheral pixel and the white intermediate data Wm of the center pixel is 1, the difference between the red intermediate data Rm of the left peripheral pixel and the red intermediate data Rm of the center pixel is 1, and the difference between the green intermediate data Gm of the left peripheral pixel and the center The difference between the green intermediate data Gm of the pixel is 0, the difference between the blue intermediate data Bm of the left peripheral pixel and the blue intermediate data Bm of the center pixel is 0, and λr is a white sub-pixel (SP _W) of the central pixel (center) white sub-pixel (SP _W) and red sub-pixels of the left neighboring pixel (left) (SP _R) distance (L _WR) and the center pixel (center) between a and Since the ratio of the maximum distance L _WR among the distances between the red, green and blue sub-pixels SP _R,G,B of the left peripheral pixel left is 1, according to Equation 3, The correction coefficient ? becomes 0.5.

And when a correction factor δ of 0.5 is applied to Equation 2, the final data Rf, Gf, Bf, and Wf of red, green, blue, and white are all calculated as 0.5.

In another embodiment of the present invention, as shown in FIG. 6 , the white intermediate data Wm of the center pixel is 1, and the red, green, and blue intermediate data Rm, Gm, and Bm are 0. . In addition, the red, green, blue and white intermediate data Rm, Gm, Bm, and Wm of the left peripheral pixel are all 0, and the blue intermediate data Bm of the right peripheral pixel is 1, Intermediate data (Rm, Gm, Wm) of red, green, and white is zero.

First, if the correction coefficient δ is calculated based on the left peripheral pixel, the difference between the white intermediate data Wm of the left peripheral pixel and the white intermediate data Wm of the center pixel is 1 However, since the difference between the red, green, and blue intermediate data (Rm, Gm, Bm) of the left peripheral pixel and the red, green, and blue intermediate data (Rm, Gm, Bm) of the center pixel is 0, According to Equation 3, the correction coefficient δ with respect to the left peripheral pixel is 0.

Next, when the correction coefficient δ is calculated based on the right peripheral pixel, the difference between the white intermediate data Wm of the right peripheral pixel right and the white intermediate data Wm of the center pixel is 1, the difference between the red intermediate data Rm of the right peripheral pixel and the red intermediate data Rm of the center pixel is 0, and the green intermediate data Gm of the right peripheral pixel and the center The difference between the green intermediate data Gm of the pixel is 0, the difference between the blue intermediate data Bm of the right peripheral pixel and the blue intermediate data Bm of the center pixel is 1, and λb is a white sub-pixel (SP _W) of the central pixel (center) white sub-pixel (SP _W) and the distance between the blue sub-pixel (SP _B) of peripheral pixels (right) right (L _WB) and the center pixel (center) of the Since the ratio of the maximum distance Lwb among the distances between the red, green, and blue sub-pixels SP _{R, G, and B} of the right neighboring pixel right is 1, according to Equation 3, the right neighboring pixel right is the standard The correction coefficient ? becomes 0.5.

And when a correction factor δ of 0.5 is applied to Equation 2, the final data Rf, Gf, Bf, and Wf of red, green, blue, and white are all calculated as 0.5.

In another embodiment of the present invention, as shown in FIG. 7 , the white intermediate data Rm, Gm, Bm, and Wm of the center pixel is 1, and the red, green and blue intermediate data Rm, Gm, Bm, Wm) are zero. In addition, the red, green, and blue intermediate data Rm, Gm, Bm, and Wm of the left peripheral pixel are all 0, and the blue intermediate data Rm, Gm, Bm, Wm of the right peripheral pixel right is 1, and the intermediate data (Rm, Gm, Bm, Wm) of red, green, and white is 0.

First, if the correction coefficient δ is calculated based on the right peripheral pixel, the difference between the white intermediate data Wm of the right peripheral pixel and the white intermediate data Wm of the center pixel is 0. Therefore, according to Equation 3, the correction coefficient δ based on the right peripheral pixel is 0.

Next, when the correction coefficient δ is calculated based on the left peripheral pixel, the difference between the white intermediate data Wm of the left peripheral pixel and the white intermediate data Wm of the center pixel is 1, the difference between the red intermediate data Rm of the left peripheral pixel and the red intermediate data Rm of the center pixel is 0, and the green intermediate data Gm of the left peripheral pixel and the center The difference between the green intermediate data Gm of the pixel is 1, the difference between the blue intermediate data Bm of the left peripheral pixel and the blue intermediate data Bm of the center pixel is 0, and λg is a white sub-pixel of the center pixel (center) of the white sub-pixel (SP _W) and the left neighboring pixel (left) the red sub-pixel 7 and the center pixel (center) of the distance (L _WG) between the (SP _R) of (SP _W ) and the red, green, and blue sub-pixels SP _R,G,B of the left peripheral pixel (left), 7/14=0.5, which is the ratio of 14, which is the maximum distance (L _{WR ), according to Equation 3} , the correction coefficient δ based on the left peripheral pixel becomes 0.25.

And when a correction factor δ of 0.25 is applied to Equation 2, red, green, blue, and final data Rf, Gf, and Bf are calculated as 0.25, and white final data Wf is calculated as 0.75.

Finally, the gamma unit 154 gamma-corrects the red, green, blue, and white final data Rf, Gf, Bf, and Wf output from the intermediate data correcting unit 153 to make it non-linear. Accordingly, the red, green, blue, and white final data Rf, Gf, Bf, and Wf non-linearized by the gamma unit 154 are transmitted to the timing driver 140 according to a predetermined data interface method.

In this way, the data conversion unit according to the display device of the present invention outputs the red, green, blue, and white colors to the central pixel based on the distances between the white sub-pixel of the central pixel and the red, green, and blue sub-pixels of the plurality of peripheral pixels. Output the final data.

Accordingly, the brightness of the red light, green light, blue light, and white light can be adjusted so that dark lines are not generated according to the boundary pattern, so that even when a specific boundary pattern is implemented, the dark lines generated due to an increase in the distance between sub-pixels may not be recognized.

That is, in the display device of the present invention, the ability to implement a specific boundary pattern can be improved, so that the image quality can be improved.

Hereinafter, a method of driving a display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 8 .

8 is a flowchart illustrating a method of driving a display device according to an exemplary embodiment. As shown in FIG. 8 , in the method of driving a display device ( S100 ) according to an exemplary embodiment of the present invention, the inverse gamma correction step S110 , the intermediate data generation step S120 , the intermediate data correction step S130 , and the gamma A correction step (S140) is included.

In the inverse gamma correction step S110, the initial data (Ri, Gi, Bi) of red, green, and blue inputted in units of frames is linearized by de-gamma correction.

In the intermediate data generation step S120, according to Equation 1, from the linearized red, green, and blue initial data Ri, Gi, Bi supplied in units of frames, red, green, blue, and white intermediate data Rm, Gm, Bm, Wm) are calculated.

[Equation 1]

Wm = MIN (Ri, Gi, Bi)

Rm = Ri - Wm

Gm = Gi - Wm

Bm = Bi - Wm

Here, MIN[a, b, c] means a minimum value among a, b, and c values.

Specifically, in the intermediate data generation step S120 , the white intermediate data Wm is set to the lowest value among the red, green, and blue initial data Ri, Gi, and Bi, and the red intermediate data Rm is set to the red initial data Ri ) and the white intermediate data (Wm), the green intermediate data (Gm) is set as the difference between the green initial data (Gi) and the white intermediate data (Wm), and the blue intermediate data (Bm) is set as the blue initial data (Bi) ) and the white intermediate data (Wm).

That is, the common data values of red, green, and blue initial data (Ri, Gi, Bi) are set as white intermediate data (Wm) values, and red, green, and blue initial data (Ri, Gi, Bi) values and The difference between the above-described common data values is set as red, green, and blue intermediate data (Rm, Gm, Bm) values.

Accordingly, by additionally generating the white intermediate data Wm in the intermediate data generating step S120 , the red intermediate data Rm, the green intermediate data Gm, and the blue intermediate data Bm may be reduced. Accordingly, the data voltage for outputting the red intermediate data Rm, the green intermediate data Gm, and the blue intermediate data Bm may be reduced.

In the intermediate data correction step (S130), the red, green, blue, and white intermediate data (Rm, Gm, Bm, Wm) is converted to the red, green, blue and white final data (Rf, Gf, Bf, Wf) according to Equation 2 ) is calculated.

[Equation 2]

Wf = (1-δ) * Wm

Rf = Rm + δ * Wm

Gf = Gm + δ * Wm

Bf = Bm + δ * Wm

Here, δ is a correction coefficient, and a setting method for the correction coefficient δ will be described later.

Specifically, in the intermediate data correction step S130 , the white final data Wf is set as the product of the white intermediate data Wm and (1 - the correction coefficient δ), and the red final data Rf is set as the red intermediate data (Rm) is set by adding the product of the white intermediate data (Wm) and the correction coefficient (δ), and the green final data (Gf) is the green intermediate data (Gm), the product of the white intermediate data (Wm) and the correction coefficient (δ) It is set by adding, and the blue final data Bf is set by adding the product of the white intermediate data Wm and the correction coefficient δ to the blue intermediate data Bm.

That is, in the intermediate data correction step ( S130 ), the white final data (Wf) is subtracted from the white intermediate data (Wm) by the product of the white intermediate data (Wm) and the correction coefficient (δ), and the red, green and blue final data (Rf, Gf, Bf) is set by adding the product of the red, green, and blue intermediate data (Rm, Gm, Bm) to the white intermediate data (Rm, Gm, Bm, Wm) and the correction coefficient (δ).

In addition, the correction coefficient δ is set to the maximum value among the plurality of correction coefficients δ calculated according to Equation 3 based on each of the plurality of neighboring pixels (side).

[Equation 3]

δ = 0.5 * { Wm(center) - Wm(side) } * MAX[ λr * { Rm(center) - Rm(side) }, λg * { Gm(center) - Gm(side) }, λb * { Bm (center) - Bm(side) }

λr = distance{SP _W (center), SP _R (side)} / MAX[distance{SP _W (center), SP _R (side)}, distance{SP _W (center), SP _G (side)}, distance {SP _W (center), SP _B (side)}]

λg = distance{SP _W (center), SP _G (side)} / MAX[distance{SP _W (center), SP _R (side)}, distance{SP _W (center), SP _G (side)}, distance {SP _W (center), SP _B (side)}]

λb = distance{SP _W (center), SP _B (side)} / MAX[distance{SP _W (center), SP _R (side)}, distance{SP _W (center), SP _G (side)}, distance {SP _W (center), SP _B (side)}]

Here, the center pixel means a pixel Px to which red, green, blue, and white final data Rf, Gf, Bf, and Wf are output, and a plurality of peripheral pixels (side) means the center It means a plurality of pixels Px adjacent to a pixel (center).

And, Rm(center), Gm(center), Bm(center), and Wm(center) are red, green, blue, and white intermediate data output to the center pixel, and Rm(side), Gm(side) , Bm(side), and Wm(side) are red, green, blue, and white intermediate data output to each of a plurality of peripheral pixels, and SP _{R, G, B, W} (center) is a central pixel (center) means the subpixel of SP _R,G,B,W (side) denotes a sub-pixel of a neighboring pixel (side), and distance{SP _W (center), SP _R,G,B,W (side)} denotes a white sub-pixel SP _W (center) of the central pixel (center). ) and the other side of the red, green, and blue sub-pixels (SP _{R, G, B} (side)) of the neighboring pixels (side) facing the same, and MAX[a, b, c ] means the maximum value among a, b, and c values.

Accordingly, λr, λb, and λg are the white sub-pixel (SP _W (center)) of the central pixel (center) and the red, green, and blue sub-pixels (SP _{R, G, B} (side)) of the peripheral pixel (side) of the maximum distance between the distance between _{the white sub-pixel (SP W} (center)) of the central pixel (center) and the red, green, and blue sub-pixels (SP _{R, G, B (side)) of the neighboring pixels (side).} means the ratio.

Here, the details of the intermediate data correction step S130 are the same as those described above with reference to FIGS. 5 to 7 .

Finally, in the gamma correction step ( S140 ), the red, green, blue, and white final data Rf, Gf, Bf, and Wf are gamma corrected and non-linear.

In this way, in the driving method according to the display device of the present invention, the red, green, blue, and white output to the central pixel is based on the distance between the white sub-pixel of the central pixel and the red, green, and blue sub-pixels of the plurality of peripheral pixels. Calculate the final data.

Accordingly, the brightness of the red light, green light, blue light, and white light can be adjusted so that dark lines are not generated according to the boundary pattern, so that even when a specific boundary pattern is implemented, the dark lines generated due to an increase in the distance between sub-pixels may not be recognized.

That is, due to the driving method of the display device of the present invention, the ability to implement a specific boundary pattern may be improved, and thus image quality may be improved.

In order to solve the above problems, a display device according to an embodiment of the present invention provides a display panel including a plurality of pixels including red, green, blue, and white sub-pixels and red, green, and blue initial data in red. , green, blue and white final data, the data conversion unit includes a distance between the white sub-pixel of the central pixel among the plurality of pixels and the red, green, and blue sub-pixels of the plurality of peripheral pixels adjacent to the central pixel. Based on , red, green, blue, and white final data output to the central pixel are calculated.

According to another aspect of the present invention, the data conversion unit generates an intermediate data generator for generating red, green, blue, and white intermediate data from the red, green, and blue initial data and converts the red, green, blue and white intermediate data to the data conversion unit. The maximum distance between the distance between the white subpixel of the central pixel and the red, green, and blue subpixels of the plurality of neighboring pixels and the distance between the white subpixel of the central pixel and the red, green and blue subpixels of the plurality of neighboring pixels and an intermediate data correction unit configured to convert the red, green, blue, and white final data according to the ratio.

According to another feature of the present invention, the intermediate data generating unit sets the white intermediate data to a lowest value among the red, green, and blue initial data, and sets the red intermediate data as a difference between the red initial data and the white intermediate data. and set the green intermediate data as a difference between the green initial data and the white intermediate data, and set the blue intermediate data as the difference between the blue initial data and the white intermediate data.

According to another feature of the present invention, the intermediate data correction unit sets the white final data as a product of the white intermediate data and (1 - correction factor ), and sets the red final data to the red intermediate data and the white intermediate data. and a product of the correction coefficient, the green final data is set by adding the product of the white intermediate data and the correction coefficient to the green intermediate data, and the blue final data is set to the blue intermediate data, the white intermediate data and the It is set by adding the product of the correction factors.

According to another feature of the present invention, the intermediate data correcting unit calculates the correction coefficient based on each of the plurality of neighboring pixels, 0.5 * { Wm(center) - Wm(side) } * MAX[ λr * { Rm(center) ) - Rm(side) }, λg * { Gm(center) - Gm(side) }, λb * { Bm(center) - Bm(side) } ] , wherein Rm(center), Gm(center), Bm(center), and Wm(center) are red, green, blue, and white intermediate data output to the central pixel, and Rm(side), Gm(side), Bm(side) and Wm(side) are red, green, blue, and white intermediate data output to each of the plurality of peripheral pixels, λr, λb, and λg are the white sub-pixel of the central pixel and red of the peripheral pixel, is the ratio of the maximum distance among the distance between the green and blue sub-pixels and the distance between the white sub-pixel of the central pixel and the red, green, and blue sub-pixels of the neighboring pixels, and MAX[a, b, c] is a, b, and c It means the maximum value among the values.

According to another feature of the present invention, the data conversion unit further includes an inverse gamma unit for gamma-decoding the red, green, and blue initial data and a gamma unit for gamma-encoding the red, green, blue, and white final data.

In order to solve the above problems, a method of driving a display device according to an embodiment of the present invention includes an intermediate data generating step of generating red, green, blue, and white intermediate data from red, green, and blue initial data, and and an intermediate data correction step of calculating red, green, blue, and white final data from the green, blue, and white intermediate data, wherein the intermediate data correction step includes a white sub-pixel of a central pixel among a plurality of pixels and a plurality of adjacent pixels. Red, green, blue, and white final data output to the central pixel is calculated based on the distance between the red, green, and blue sub-pixels of the neighboring pixels of .

According to another feature of the present invention, in the intermediate data generating step, the white intermediate data is set to a lowest value among the red, green, and blue initial data, and the red intermediate data is set as a difference between the red initial data and the white intermediate data. and the green intermediate data is set as a difference between the green intermediate data and the white intermediate data, and the blue intermediate data is set as a difference between the blue initial data and the white intermediate data.

According to another feature of the present invention, in the intermediate data correction step, the white final data is set as a product of the white intermediate data and (1 - correction factor ), and the red final data is the red intermediate data and the white The green final data is set by adding a product of the intermediate data and the correction coefficient, the green final data is set by adding the product of the white intermediate data and the correction coefficient to the green intermediate data, the blue final data is the blue intermediate data and the white intermediate data and the product of the correction coefficient.

According to another feature of the present invention, in the intermediate data correction step, the correction coefficient is

Based on each of the plurality of neighboring pixels, 0.5 * { Wm(center) - Wm(side) } * MAX[ λr * { Rm(center) - Rm(side) }, λg * { Gm(center) - Gm(side) ) }, λb * { Bm(center) - Bm(side) } ], set to a maximum value among a plurality of correction coefficients, wherein Rm(center), Gm(center), Bm(center), Wm( center) is red, green, blue, and white intermediate data output to the central pixel, and Rm(side), Gm(side), Bm(side), and Wm(side) are outputted to each of the plurality of peripheral pixels red, green, blue and white intermediate data, and λr, λb, and λg are the distances between the white subpixel of the central pixel and the red, green and blue subpixels of the peripheral pixel and the white subpixel of the central pixel and the peripheral pixel is the ratio of the maximum distance among the distances between the red, green, and blue sub-pixels of , and MAX[a, b, c] means the maximum value among a, b, and c values.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device
110: display panel
120: data driving unit
130: gate driver
140: timing control
150: data conversion unit
Px: Pixel
SP _R : Red sub-pixel
SP _G : Green sub-pixel
SP _B : Blue sub-pixel
SP _W : White sub-pixel

Claims (10)

a display panel including a plurality of pixels including red, green, blue, and white sub-pixels; and
A data conversion unit for converting red, green, and blue initial data into red, green, blue and white final data,
The data conversion unit includes a distance between a white sub-pixel of a central pixel among the plurality of pixels and red, green, and blue sub-pixels of a plurality of peripheral pixels adjacent to the central pixel, and a white sub-pixel of the central pixel and a red color of the peripheral pixel. , set the correction factor to increase according to the ratio of the maximum distance among the distances between the green and blue sub-pixels,
generating red, green, blue and white intermediate data from the red, green, and blue initial data;
calculating each of the red, green, and blue final data output to the central pixel by adding data proportional to the correction coefficient to each of the red, green, and blue intermediate data;
and calculating the white final data output to the central pixel by subtracting data proportional to the correction coefficient from the white intermediate data. According to claim 1,
The data conversion unit,
an intermediate data generator for generating the red, green, blue, and white intermediate data from the red, green, and blue initial data; and
The distance between the red, green, blue and white intermediate data of the central pixel and the red, green, and blue subpixels of the plurality of peripheral pixels and the white subpixel of the central pixel and the red color of the plurality of peripheral pixels and an intermediate data corrector configured to output the red, green, blue, and white final data by converting according to a ratio of a maximum distance among distances between green and blue sub-pixels. 3. The method of claim 2,
The intermediate data generation unit,
Set the white intermediate data to the lowest value among the red, green and blue initial data,
setting the red intermediate data as a difference between the red initial data and the white intermediate data;
setting the green intermediate data as a difference between the green initial data and the white intermediate data;
and setting the blue intermediate data as a difference between the blue initial data and the white intermediate data. 3. The method of claim 2,
The intermediate data correction unit,
Set the white final data to the product of the white intermediate data and (1 - the correction factor );
setting the red final data by adding the product of the white intermediate data and the correction coefficient to the red intermediate data;
setting the green final data by adding the product of the white intermediate data and the correction coefficient to the green intermediate data;
and setting the blue final data by adding a product of the white intermediate data and the correction coefficient to the blue intermediate data. 5. The method of claim 4,
The intermediate data correction unit calculates the correction coefficient.
0.5 * { Wm(center) - Wm(side) } * MAX[ λr * { Rm(center) - Rm(side) }, λg * { Gm(center) - Gm( side) }, λb * { Bm(center) - Bm(side) } ] set to the maximum value among the plurality of correction coefficients,
The Rm(center), Gm(center), Bm(center), and Wm(center) are intermediate data of red, green, blue, and white output to the central pixel, and the Rm(side), Gm(side), and Bm (side) and Wm(side) are red, green, blue, and white intermediate data output to each of the plurality of peripheral pixels, and λr, λb, and λg are the white sub-pixel of the central pixel and red and green of the peripheral pixel and a ratio of the maximum distance among the distance between the blue sub-pixel and the distance between the white sub-pixel of the central pixel and the red, green, and blue sub-pixels of the neighboring pixels, and MAX[a, b, c] is the values of a, b, and c Meaning the maximum value of the display device. 3. The method of claim 2,
The data conversion unit,
an inverse gamma unit for gamma-decoding the red, green and blue initial data;
and a gamma unit gamma-encoding the red, green, blue, and white final data. A method of driving a display device including a plurality of pixels composed of red, green, blue and white sub-pixels, the method comprising:
an intermediate data generation step of generating red, green, blue, and white intermediate data from the red, green, and blue initial data; and
an intermediate data correction step of calculating red, green, blue and white final data from the red, green, blue and white intermediate data;
In the intermediate data correction step, the distance between the white sub-pixel of the central pixel among the plurality of pixels and the red, green, and blue sub-pixels of the plurality of peripheral pixels adjacent to the central pixel, and the white sub-pixel of the central pixel and the peripheral pixel The correction coefficient is set to increase according to the ratio of the maximum distance among the distances between the red, green, and blue sub-pixels of Calculated by adding data proportional to the correction coefficient,
and calculating the white final data output to the central pixel by subtracting data proportional to the correction coefficient from the white intermediate data. 8. The method of claim 7,
In the intermediate data generation step,
The white intermediate data is set to the lowest value among the red, green and blue initial data,
The red intermediate data is set as a difference between the red initial data and the white intermediate data,
The green intermediate data is set as a difference between the green initial data and the white intermediate data;
The blue intermediate data is set as a difference between the blue initial data and the white intermediate data. 8. The method of claim 7,
In the intermediate data correction step,
the white final data is set as the product of the white intermediate data and (1 - the correction factor );
The red final data is set by adding a product of the white intermediate data and the correction coefficient to the red intermediate data;
The green final data is set by adding the product of the white intermediate data and the correction coefficient to the green intermediate data;
The blue final data is set by adding a product of the white intermediate data and the correction coefficient to the blue intermediate data. 10. The method of claim 9,
In the intermediate data correction step, the correction coefficient is
Based on each of the plurality of neighboring pixels, 0.5 * { Wm(center) - Wm(side) } * MAX[ λr * { Rm(center) - Rm(side) }, λg * { Gm(center) - Gm(side) ) }, λb * { Bm(center) - Bm(side) } ] is set as the maximum value among the plurality of correction coefficients,
The Rm(center), Gm(center), Bm(center), and Wm(center) are intermediate data of red, green, blue, and white output to the central pixel, and the Rm(side), Gm(side), and Bm (side) and Wm(side) are red, green, blue, and white intermediate data output to each of the plurality of peripheral pixels, and λr, λb, and λg are the white sub-pixel of the central pixel and red and green of the peripheral pixel and a ratio of the maximum distance among the distance between the blue sub-pixel and the distance between the white sub-pixel of the central pixel and the red, green, and blue sub-pixels of the neighboring pixels, and MAX[a, b, c] is the values of a, b, and c A method of driving a display device, which means the maximum value among them.

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