KR101922072B1 - Method and apparatus for converting data, method and apparatus for driving of flat panel display device - Google Patents

Abstract

The present invention relates to a data conversion apparatus and method, a driving apparatus and a driving method of a flat panel display device capable of reducing the deterioration and deterioration rate of each of four color sub-pixels constituting a unit pixel, The apparatus comprising: a data analyzer for analyzing three-color input data and generating a maximum gray-scale value and a minimum gray-scale value for each unit pixel of the previous and current frames; A mode signal generator for generating a data conversion mode signal of a first or second logic state for determining a data conversion mode based on a maximum gradation value and a minimum gradation value for each unit pixel of the previous and current frames; And a controller for analyzing the three-color input data according to the data conversion mode signal to generate four-color data consisting of the white color data having the gray-scale value based on the black color tone value or the three-color input data and the three- And a four-color data generating unit for generating the four-color data.

Description

TECHNICAL FIELD [0001] The present invention relates to a data conversion apparatus and method, a driving apparatus and a driving method of a flat panel display apparatus,

More particularly, the present invention relates to a data conversion apparatus and method that can reduce deterioration and deterioration rates of each of four color sub-pixels constituting a unit pixel, a driving apparatus and a driving method of the flat panel display ≪ / RTI >

In recent years, the importance of display devices has been increasing with the development of multimedia. In response to this, flat panel display devices such as a liquid crystal display device, a plasma display panel, and an organic light emitting display device have been put to practical use. Among such flat panel display devices, self-emission type organic light emitting display devices are attracting attention as a next generation display device because they have a high response speed, low power consumption, high resolution and large screen.

A typical organic light emitting display device includes red (R), green (G), and blue (B) subpixels as one unit pixel and displays one image of various colors through three subpixels.

Recently, a four-color organic light emitting display device in which white (W) sub-pixels are added to a unit pixel in order to increase the luminance of a unit pixel has been developed. The four-color organic light emitting display device has three color input data of red (R), green (G) and blue (B) as red (R '), green (G'), W), and displays them.

The method of converting three-color data into four-color data is a method of converting the minimum gradation value (or common gradation value) among input red, green, and blue input data R, G, and B Green and blue three-color data R (R, G, and B) by subtracting the white data W from the three-color input data R, G ', and B'), thereby converting the three-color input data R, G, and B into the four-color data R '/ G' / B '/ W. For example, when the three-color input data R, G, and B of the previous frame Fn-1 are composed of 20 (R), 30 (G), and 35 (B) The apparatus converts the three-color input data (R, G, B) into four-color data R '/ G' / B (B) consisting of 0 (R '), 10 '/ W). When each of the three-color input data R, G and B of the current frame Fn is composed of 10 (R), 10 (G) and 15 (B), the conventional four- Color data (R '/ G' / B '/ W) composed of 0 (R'), 0 (G '), 5 (B') and 10 . In this case, in the conventional four-color organic light emitting diode display, the four-color data R '/ G (G) converted from the three-color input data R, G, B of the previous frame Fn-1 and the current frame Fn (R), 5 (G), 10 (B), and 15 (W) of the red, green, blue, Accordingly, the conventional four-color organic light emitting diode display according to the data conversion method described above can reduce the power consumption at the same luminance through the brightness of the white pixel.

However, unlike a liquid crystal display device, a conventional four-color organic light emitting display device has a point light source structure in which each sub-pixel emits light with a different brightness, so that a deterioration deviation occurs between sub-pixels depending on a light emission time and a use time. Even if the same data is supplied to each of the sub-pixels, a luminance deviation occurs between the sub-pixels.

In the conventional four-color organic light emitting display device, as the average usage of white sub-pixels is increased as compared with the red, green, and blue sub-pixels, the degradation rate of white sub-pixels relatively increases This causes a problem that the deterioration of each of the four color sub-pixels constituting the unit pixel is further increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a data conversion apparatus and method, a driving apparatus and a driving method of the flat panel display apparatus, which can reduce the deterioration and deterioration rate of each of four color sub- The technical problem is to provide.

According to an aspect of the present invention, there is provided a data conversion apparatus for analyzing three-color input data and generating a maximum gray-scale value and a minimum gray-scale value for each unit pixel of a previous frame and a current frame; A mode signal generator for generating a data conversion mode signal of a first or second logic state for determining a data conversion mode based on a maximum gradation value and a minimum gradation value for each unit pixel of the previous and current frames; And a controller for analyzing the three-color input data according to the data conversion mode signal to generate four-color data consisting of the white color data having the gray-scale value based on the black color tone value or the three-color input data and the three- And a four-color data generating unit for generating the four-color data.

Wherein the four-color data generator sets the minimum gradation value of the three-color input data to the white data according to the data conversion mode signal of the first logic state, Value is set to the white data.

According to an aspect of the present invention, there is provided a driving apparatus for a flat panel display including a plurality of red, green, blue, and white sub-pixels formed in pixel regions defined by intersections of a plurality of scanning lines and a plurality of data lines A display panel including a unit pixel of the display panel; A data converter for analyzing input three-color input data to generate four-color data consisting of three-color correction data to be supplied to each of the red, green and blue sub-pixels and white data to be supplied to the white sub-pixel; And a panel driver for supplying a scan signal to the scan line, converting the four-color data into a data voltage, and supplying the data voltage to the data line, wherein the data converter includes the data converter.

According to another aspect of the present invention, there is provided a data conversion method comprising: (A) analyzing three-color input data to generate a maximum gray-scale value and a minimum gray-scale value for each unit pixel of a previous frame and a current frame; (B) generating a data conversion mode signal of a first or second logic state for determining a data conversion mode based on a maximum gradation value and a minimum gradation value for each unit pixel of the previous and current frames; And a step (C) of analyzing the three-color input data according to the data conversion mode signal to generate four-color data consisting of white data and three-color correction data reflecting the white data, And a gray scale value based on the black gradation value or the three-color input data in accordance with the data conversion mode signal.

According to an aspect of the present invention, there is provided a method of driving a flat panel display including a plurality of red, green, blue, and white sub-pixels formed in pixel regions defined by intersections of a plurality of scanning lines and a plurality of data lines Wherein the three color correction data to be supplied to each of the red, green and blue sub-pixels and the white color data to be supplied to the white sub- Generating four-color data; And supplying the scan signal to the scan line, converting the 4-color data into a data voltage, and supplying the 4-color data to the data line, wherein the 4-color data generation step comprises the data conversion method .

According to the solution of the above problems, the data conversion apparatus and method, the driving apparatus and the driving method of the flat panel display device according to the present invention can be applied to the present invention based on the three color input data (R / G / B) The gray level value of the white data at the time of conversion of the four-color data of the frame is generated as the minimum gray level value or the black gray level value of the three-color input data (R / G / B) It is possible to reduce the deterioration rate and deterioration rate of each sub-pixel of the unit pixel.

FIG. 1 is a view for explaining a method of converting three-color data into four-color data in a conventional organic light emitting diode display.
2 is a block diagram schematically showing a data conversion apparatus according to an embodiment of the present invention.
3 is a view for explaining four-color data of a previous frame and a current frame which are converted by the data conversion apparatus according to the embodiment of the present invention.
4 is a flowchart illustrating a data conversion method using a data conversion apparatus according to an embodiment of the present invention.
5 is a block diagram schematically showing a driving apparatus for a flat panel display according to an embodiment of the present invention.
FIG. 6 is a table showing the amounts of use of respective sub-pixels according to the conventional and the four-color data of the present invention converted from the three-color input data of the previous and current frames.
FIG. 7 is a table showing the usage amounts of the sub-pixels according to the conventional and comparative example 1 four-color data converted from the three-color input data of the previous and current frames.
FIG. 8 is a table showing the usage amounts of the sub-pixels according to the conventional and the four-color data of the second comparative example converted from the three-color input data of the previous and current frames.
FIG. 9 is a table showing the usage amounts of the sub-pixels according to the conventional and the four-color data of the third comparative example converted from the three-color input data of the previous and current frames.
10 is a view showing a comparison between the ratio of the amount of usage and the minimum amount of use of each sub pixel according to the conventional and the four-color data of the present invention converted from a television moving picture of a plurality of frames.

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

2 is a block diagram schematically showing a data conversion apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the data conversion apparatus 100 according to the embodiment of the present invention calculates the unit of each of the previous frame and the current frame based on the three-color data (R / G / B) A data analyzing unit 110 for generating maximum gradation values (Max_Fn-1, Max_Fn) and reference values (kMax_Fn-1, kMin_Fn) for each pixel of each of the previous frame and the current frame, And a data conversion mode signal MS for generating a data conversion mode signal MS for determining a data conversion mode based on the data conversion mode signal MS and the reference value kMax_Fn-1, kMin_Fn, Color data including three-color correction data (R '/ G' / B ') in which white data (W) and white data (W) are reflected by analyzing the three-color input data (R / G / B) And a four-color data generating unit 130.

The data analyzer 110 analyzes input data (R / G / B) of red, green, and blue to be supplied to each unit pixel in units of frames and calculates a maximum gray value Max_Fn-1, Max_Fn) and reference values (kMax_Fn-1, kMin_Fn). The data analyzer 110 includes a tone value extractor 112, a reference value generator 114, and a storage unit 116.

The gray value extractor 112 analyzes the red, green, and blue input data (R / G / B) to be supplied to each unit pixel on a frame basis and calculates the maximum gray value Max and the minimum gray value Value (Min). The tone value extraction unit 112 supplies the maximum tone value Max of each generated unit pixel to the storage unit 116 and the mode signal generation unit 120 and outputs the minimum tone value (Min) to the reference value generator 114.

Specifically, the tone value extracting unit 112 extracts the largest tone value (or data value) among the red, green, and blue input data R / G / B corresponding to one unit pixel, The maximum gradation value Max of the gradation value. The tone value extracting unit 112 extracts the smallest tone value (or data value) among the red, green, and blue input data R / G / B corresponding to one unit pixel, Thereby generating a minimum gradation value (Min). For example, when each of the three-color input data R, G, and B to be supplied to a specific unit pixel is 20 (R), 30 (G), and 35 (B), the tone value extracting unit 112 35 as the maximum gradation value Max of the specific unit pixel and 20 as the minimum gradation value Min.

The reference value generator 114 generates a reference value kMin of each unit pixel corresponding to the minimum gradation value Min of each unit pixel provided from the gray value extractor 112, Supplies the reference value kMin of the pixel to the storage unit 116 and supplies it to the mode signal generation unit 120. [ That is, the reference value generator 114 generates the reference value kMin of each unit pixel by reflecting the weight k set to the minimum tone value Min of each unit pixel.

The weight k may be a value set according to the deterioration characteristic of the white sub-pixel W or the like and may be set to a natural number of 2 or more. The weight k is set by a preliminary experiment so that the deterioration is not concentrated in the white sub-pixels W in the four-color data converted from the three-color input data but is dispersed in the other three color sub-pixels. For example, when the white data of the white sub-pixel is set to the minimum gradation value of the three-color input data (R / G / B) A sub-pixel having a large gradation value has a gradation value (Max - Min) obtained by subtracting the minimum gradation value (Min) from the maximum gradation value (Max). When the white sub-pixel has a higher gray-scale value than the sub-pixel having the largest gray-scale value Max (Max-Min <Min) after the conversion of the four-color data, Pixels have higher luminance values than the other three color sub-pixels. Accordingly, when the highest gradation value Max of the three-color input data R / G / B is smaller than twice the minimum gradation value Min (Max <2Min), deterioration is concentrated in the white sub-pixel .

When the weight value k is greater than 2, that is, when the highest gradation value Max among the three-color input data R / G / B of the unit pixel is the minimum gradation value (2Min) of the sub-pixels other than the white sub-pixel, deterioration is concentrated in the sub-pixels other than the white sub-pixel. Conversely, when the weight k is less than 2, that is, the highest gradation value Max among the three color input data R / G / B of the unit pixel is less than 2 times the minimum gradation value Min The deterioration is concentrated in the white sub-pixel. Therefore, it is preferable that the weight k is set to a value of 2.

The storage unit 116 stores the reference value of each unit pixel supplied from the reference value generation unit 114 so as to correspond to the maximum tone value Max of each unit pixel supplied from the tone value extraction unit 112 on a frame- (kMin) for each unit pixel. Accordingly, the information stored in the storage unit 116 on a frame-by-frame basis is a maximum gray-scale value (Max_Fn-1) and a reference value (kMin_Fn-1) of the previous frame.

The mode signal generation unit 120 generates a mode signal by multiplying a maximum gray level value (Max_Fn-1) and a reference value (kMin_Fn-1) of a previous frame supplied from the data analysis unit 110 and a unit pixel And generates a data conversion mode signal MS for determining a data conversion mode based on the maximum gradation value Max_Fn and the reference value kMin_Fn. The mode signal generating unit 120 includes first and second comparing units 121 and 123, a mode determining unit 125, and a memory 127.

The first comparator 121 compares the maximum gradation value Max_Fn and the reference value kMin_Fn for each unit pixel of the current frame provided from the data analyzer 110, i.e., the gray value extractor 112, To generate the first comparison signal CS1 of the first or second logic state and supplies the generated first comparison signal CS1 to the mode determination unit 125. [ For example, when the reference value (kMin_Fn) of a specific unit pixel in the current frame is greater than the maximum gradation value (Max_Fn) corresponding thereto (Max_Fn <kMin_Fn), the first comparator 121 compares the reference value Generates a first comparison signal CS1 and, if not, generates a first comparison signal CS1 of a second logic state different from the first logic state.

The second comparator 123 compares the maximum gray level value Max_Fn-1 and the reference value kMin_Fn-1 of the previous frame supplied from the data analyzer 110, that is, the gray value extractor 112, And generates the second comparison signal CS2 of the first or second logic state and supplies the generated second comparison signal CS2 to the mode determination unit 125. [ For example, in the previous frame, when the reference value (kMin_Fn-1) in a specific unit is larger than the maximum tone value (Max_Fn-1) corresponding thereto (Max_Fn-1 <kMin_Fn-1) 123) generates a second comparison signal CS2 of the first logic state (e.g., a high state) and otherwise generates the second logic state (e.g., a low state) The second comparison signal CS2 of FIG.

The mode determination unit 125 determines whether the first and second comparison signals CS1 and CS2 for each unit pixel supplied from the first and second comparison units 121 and 123 and the previous frame (E.g., a high state) or a second logic state (e.g., a low state) for determining a data conversion mode based on a pixel-by-pixel data conversion mode signal MS_Fn- ) State of the current frame, and supplies the data conversion mode signal MS_Fn for each unit pixel of the generated current frame to the four-color data generation unit 130 .

Specifically, the mode determination unit 125 determines whether the first and second comparison signals CS1 and CS2 have a first logic state and a data conversion mode signal MS_Fn-1 (MS_Fn) of the current frame having a first logic state (e.g., a high state) only if the first logic state (e.g., low state) of the first logic state (e. G., Low state) And generates a data conversion mode signal MS_Fn of the current frame having a second logic state (for example, a low state) if not. At this time, the data conversion mode signal MS_Fn of the current frame having the first logic state is a three-color data signal (MS_Fn) in which the white data W and the white data W set based on the three-color input data R / G / As a signal for setting a first data conversion mode for generating four-color data (R '/ G' / B '/ W) composed of correction data R' / G '/ B' Is a signal for setting the tone value of the white data W to the minimum value (Min) of the other three-color input data. On the other hand, the data conversion mode signal MS_Fn of the current frame having the second logic state is the three-color data R '/ G' / B (R / G / B) Color data R '/ G' consisting of three-color correction data (R '/ G' / B ') in which the white data W set to the black gradation value and the white data W of the black gradation value are reflected '/ B' / W), the gray level value of the white data supplied to the white sub-pixel is set as the black level value regardless of the gray level value of the other three-color input data .

The memory 127 stores the data conversion mode signal MS_Fn for each unit pixel of the current frame provided from the mode determination unit 125 to the four-color data generation unit 130, (MS) to the mode determination unit 125 as the unit pixel specific data conversion mode signal MS_Fn-1 of the previous frame.

The four-color data generation unit 130 generates three-color data of each unit pixel input in accordance with the data conversion mode signal MS_Fn of the current frame having the first or second logic state provided from the mode signal generation unit 120, Color data R '/ G' consisting of three-color correction data R '/ G' / B 'in which the white data W and the white data W are reflected by analyzing the input data R / G / / B '/ W) and outputs it to the outside.

Specifically, when the data conversion mode signal MS_Fn of the current frame supplied from the mode signal generation unit 120, that is, the mode determination unit 125, is in the first logic state , The minimum gradation value (Min) in the three-color input data (R / G / B) of each unit pixel is set to white data (W) (G ') and the white color data (R' / G '/ B') by subtracting the white data W from the white data W and generating the three color correction data R ' And outputs the four-color data (R '/ G' / B '/ W) to the outside. For example, the four-color data generator 130 generates the data conversion mode signal MS of the current frame having the first logic state H, as in the previous frame Fn-1 shown in FIG. 3, (R, G, B) of 20 (R), 30 (G), and 35 The 20 red data R and 0 green data G are generated as the white data W and the green data G of 30 as the green correction data G ) And 15 (B ') and 20 (W'), respectively, by correcting the blue input data (B) And generates three-color correction data (R '/ G' / B '). Here, the four-color data generation unit 130 may extract the minimum tone value Min from the three-color input data R / G / B of the unit pixel through the calculation, The maximum gradation value Min of the unit pixel can be received from the value extracting unit 112. [

If the data conversion mode signal MS_Fn of the current frame supplied from the mode signal generation unit 120, that is, the mode determination unit 125, is in the second logic state , The black gradation value is set to white data W regardless of the gradation value of the three color input data (R / G / B) of each unit pixel, G '/ B') by subtracting the white data W of the tone values from the white data W and the three-color correction data R '/ G' / B ' (R '/ G' / B '/ W) composed of the four color data (R' / G ' In this case, when the data conversion mode signal MS_Fn of the current frame having the second logic state is supplied from the mode determination unit 125, the four-color data generation unit 130 supplies the black sub-pixel of each unit pixel G '/ B /) by bypassing the three-color input data (R / G / B) without correction and generating white color data W . For example, the four-color data generating unit 130 may generate the four-color data by using the data conversion mode signal MS_Fn of the current frame having the second logic state L, as in the current frame Fn shown in FIG. 3, And the three-color input data R, G and B of 10 (R), 10 (G) and 15 (B) are supplied, the four- 10 (R '), 10 (R'), and 10 (B ') of the red input data R and the green input data G of 10 and the blue input data B of 15, (R '/ G' / B ') composed of three color correction data (G'), 15 (B ') and 0 (W).

4 is a flowchart illustrating a data conversion method using a data conversion apparatus according to an embodiment of the present invention.

A data conversion method according to an embodiment of the present invention will be described with reference to FIG.

First, by analyzing input data (R / G / B) of red, green, and blue to be supplied to each unit pixel in frame units, maximum gray level values (Max_Fn-1, Max_Fn) And a reference value (kMax_Fn-1, kMin_Fn) (S100).

Specifically, in step S100, input data (R / G / B) of red, green, and blue to be supplied to each unit pixel is analyzed on a frame-by-frame basis to calculate a maximum gradation value Max and a minimum gradation value (S110). Then, the reference value kMin of each unit pixel is generated by reflecting the weight k set to the minimum gradation value Min of each unit pixel (S120). Subsequently, a unit (unit) generated from the maximum gradation value Max of each unit pixel extracted from the red, green and blue input data (R / G / B) of the current frame and the minimum gradation value Min of each unit pixel The pixel-specific reference value (kMin) is stored in the storage unit. Accordingly, the maximum tone value Max and the reference value kMin for each unit pixel generated from the red, green, and blue input data R / G / B of the current frame correspond to the maximum tone value (Max_Fn) and the reference value (kMin_Fn), and the maximum gray-scale value Max and the reference value kMin of each unit pixel stored in the storage unit are used as the maximum gray-scale value Max_Fn- Value (kMin_Fn-1). Since the step S100 is performed by the data analysis unit 110, a detailed description thereof will be omitted.

Then, based on the maximum gradation value (Max_Fn-1) and the reference value (kMin_Fn-1) of the previous frame and the maximum gradation value (Max_Fn) and the reference value (kMin_Fn) A data conversion mode signal MS for determining a data conversion mode is generated for each unit pixel (S200).

For example, in step S200, the maximum gray-level value Max_Fn of the current frame is compared with a corresponding reference value kMin_Fn (step S210). The maximum gray level value Max_Fn-1 of the previous frame and the reference value kMin_Fn-1 corresponding to the reference gray level value Max_Fn-1 are compared with the maximum gray level value Max_Fn of the current frame (Yes in S210) 1) (S220); If the reference value (kMin_Fn-1) of the previous frame is greater than the maximum gradation value (Max_Fn-1) corresponding thereto (Yes in S220), the data conversion mode signal MS_Fn- (Step S230); And the data conversion mode signal MS_Fn-1 of the current frame having the first logic state H when the data conversion mode signal MS_Fn-1 of the previous frame is the second logic state L ('Yes' in S230) (S240). If the reference value kMin_Fn of the current frame is smaller than the corresponding maximum gray-level value Max_Fn in step S210 (No in step S210), the reference value kMin_Fn-1 of the previous frame is calculated in step S220 (No in S220) or when the data conversion mode signal MS_Fn-1 of the previous frame is the first logic state (H) in step S230 (No in S230), the data conversion mode signal MS_Fn of the current frame having the second logic state L is generated (S250). Since the above-described step S200 is performed in the above-described mode signal generating unit 120, a detailed description thereof will be omitted.

Then, the three-color input data (R / G / B) of each unit pixel input in accordance with the data conversion mode signal MS_Fn of the current frame having the first or second logic state (H, L) (R '/ G' / B '/ W) and outputs it to the outside (S300). That is, in step S300, the white data W consisting of the minimum gradation value Min or the black gradation value in the three-color input data (R / G / B) according to the data conversion mode signal MS_Fn of the current frame And generates four-color data (R '/ G' / B '/ W) including the color data.

More specifically, when the data conversion mode signal MS_Fn of the current frame is the first logic state H, the step S300 calculates the minimum gradation value Min in the three-color input data R / G / B of each unit pixel, G '/ B') by subtracting the generated white data (W) from each of the three-color input data (R / G / B) And generates four-color data R '/ G' / B '/ W consisting of the generated white data W and the three-color correction data R' / G '/ B' (S310). For example, in step S310, as in the previous frame Fn-1 shown in FIG. 3, the three-color input data R, G, and B of 20 (R), 30 (G) B) is composed of 4 (R '), 10 (G'), 15 (B ') and 20 (W) according to the data conversion mode signal MS_Fn of the current frame having the first logic state And converted into color data (R '/ G' / B '/ W).

If the data conversion mode signal MS_Fn of the current frame is the second logic state L, the step S300 sets the black gradation value to the white data W and the three color input data R / G / (R '/ G') consisting of the white data W having the black gradation value and the bypassed three color correction data R '/ G' / B ' '/ B' / W) (S320). For example, in step S320, the three-color input data R, G, and B of 10 (R), 10 (G), and 15 (B), as in the current frame Fn shown in FIG. (R '), 10 (G'), 15 (B '), and 0 (W) according to the data conversion mode signal MS_Fn of the current frame having the second logic state (R '/ G' / B '/ W).

Then, the above-described steps S100 to S300 are repeated to generate four-color data (R '/ G' / B '/ W) for each unit pixel of one frame.

As described above, the data conversion apparatus and the data conversion method using the data conversion apparatus according to the embodiment of the present invention are capable of converting the four-color data of the current frame based on the three-color input data (R / G / B) The gray level value of the data is generated as the minimum gray level value or the black gray level value of the three-color input data (R / G / B) to distribute the usage amount and the deterioration amount of the unit pixel to the white sub- It is possible to reduce the deterioration rate and deterioration speed of the sub-pixels.

5 is a block diagram schematically showing a driving apparatus for a flat panel display according to an embodiment of the present invention.

Referring to FIG. 5, the apparatus for driving a flat panel display according to an exemplary embodiment of the present invention includes a display panel 210, a data converter 220, and a panel driver 230.

The display panel 210 displays the organic light emitting devices OLED of the red, green, blue, and white sub-pixels P constituting the unit pixel according to the data voltage Vdata supplied from the panel driver 230, Thereby displaying an image through the light emitted from each unit pixel. The display panel 210 includes a plurality of data lines DL and a plurality of scan lines SL that are formed to intersect with each other and define a pixel region, A power supply line PL1, and a plurality of second power supply lines PL2 formed to cross the plurality of first power supply lines PL1.

The plurality of data lines DL are formed at regular intervals along the first direction and the plurality of scan lines SL are formed at regular intervals along the second direction crossing the first direction. The first power supply line PL1 is formed adjacent to each of the plurality of data lines DL and is supplied with the first driving power from the outside.

Each of the plurality of second power supply lines PL2 is formed to cross the plurality of first power supply lines PL1 and receives the second driving power from the outside. At this time, the second driving power source may have a lower potential level than the first driving power source, or may have a ground (or ground) voltage level.

Meanwhile, the display panel 210 may include a common electrode instead of the plurality of second power lines PL2. In this case, the common electrode may be formed on the entire display region of the display panel 210 to receive the second driving power from the outside.

Each of the red, green, blue, and white sub-pixels P constituting the one unit pixel includes an organic light emitting diode OLED and a pixel circuit PC.

The organic light emitting diode OLED is connected between the pixel circuit PC and the second power supply line PL2 and emits a predetermined color light by emitting light in proportion to the amount of data current supplied from the pixel circuit PC . The organic light emitting diode OLED includes an anode electrode (or a pixel electrode) connected to the pixel circuit PC, a cathode electrode (or a reflective electrode) connected to the second driving power supply line PL2, And an organic light emitting cell formed between the anode and the cathode to emit light of any one of red, green, blue, and white. Here, the organic light emitting cell may have a structure of a hole transporting layer / an organic light emitting layer / electron transporting layer or a structure of a hole injecting layer / a hole transporting layer / an organic light emitting layer / an electron transporting layer / an electron injecting layer. Further, the organic light emitting cell may further include a functional layer for improving the luminous efficiency and / or lifetime of the organic light emitting layer.

The pixel circuit PC responds to the data voltage Vdata supplied from the panel driver 230 to the data line DL in response to the scan signal SS supplied from the panel driver 230 to the scan line SL. So that the data current flows through the organic light emitting diode OLED. To this end, the pixel circuit PC comprises a switching transistor, a driving transistor, and at least one capacitor formed on a substrate by a thin film transistor forming process.

The switching transistor is switched according to a scanning signal SS supplied to the scanning line SL to supply the driving transistor with the data voltage Vdata supplied from the data line DL. The driving transistor is switched according to the data voltage Vdata supplied from the switching transistor to generate a data current based on the data voltage Vdata and supplies the data current to the organic light emitting diode OLED, . The at least one capacitor holds the data voltage supplied to the driving transistor for one frame.

In the pixel circuit PC of each pixel P, a threshold voltage deviation of the driving transistor is generated in accordance with the driving time of the driving transistor, and the image quality may be deteriorated. Accordingly, the OLED display according to the present invention may further include a compensation circuit (not shown) for compensating a threshold voltage of the driving transistor.

The compensation circuit is composed of at least one compensation transistor (not shown) and at least one compensation capacitor (not shown) formed inside the pixel circuit PC. The compensation circuit compensates the threshold voltage of each driving transistor T2 by storing the data voltage and the threshold voltage of the driving transistor T2 together in the capacitor during the detection period for detecting the threshold voltage of the driving transistor T2 do.

The data converting unit 220 analyzes the three-color input data R / G / B inputted from an external system body (not shown) or a graphic card (not shown) and outputs red, green, Color data R 'consisting of red correction data R', green correction data G ', blue correction data B', and white data W to be supplied to the white subpixels P, / G '/ B' / W) and supplies the generated four-color data R '/ G' / B '/ W to the panel driver 230. The data conversion unit 220 includes the data conversion apparatus 100 of the present invention described above with reference to FIGS. 2 to 4, and a duplicate description thereof will be omitted.

Meanwhile, the data conversion unit 220 may be embedded in the panel driver 230.

The panel driver 230 generates a scan control signal and a data control signal based on the input timing synchronization signal TSS and generates a scan signal SS in accordance with the scan control signal to sequentially Color data R '/ G' / B '/ W supplied from the data converter 220 into a data voltage Vdata and supplies the converted data voltage Vdata to the data line DL. The panel driver 230 includes a timing controller 232, a scan driver 234, and a data driver 236.

The timing controller 232 controls the timing of the scan driving circuit 234 and the data driving circuit 236 in accordance with the timing synchronization signal TSS input from an external system body (not shown) or a graphic card (not shown) . That is, the timing controller 232 generates the scan control signal SCS based on the timing synchronization signal TSS such as the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the data enable DE, and the clock DCLK, And drives the data driving circuit portion 236 through the data control signal DCS so as to synchronize with the driving timing control of the scanning driving circuit portion 234 through the scanning control signal SCS Timing.

The timing controller 232 controls the four color data R '/ G' / B '/ W supplied from the data converter 220 to be red, green, and blue , And white, and supplies the data to the data driving circuit unit 236.

Meanwhile, the data conversion unit 220 may be embedded in the timing control unit 232, and in this case, it may be embedded in a program form.

The scan driving circuit portion 234 generates a scan signal SS according to the scan control signal SCS supplied from the timing controller 232 and sequentially supplies the scan signal to the plurality of scan lines SL.

The data driving circuit 236 receives the four-color data R '/ G' / B '/ W and the data control signal DCS arranged by the timing controller 232, A plurality of reference gamma voltages are supplied. The data driving circuit unit 236 converts the four-color data R '/ G' / B '/ W into analog data voltages Vdata using a plurality of reference gamma voltages in accordance with the data control signal DCS. And supplies the converted data voltage to the corresponding data line DL.

The driving apparatus for a flat panel display according to the present invention is a driving apparatus for a flat panel display according to an embodiment of the present invention that uses the data conversion unit 220 to generate a current frame based on three color input data (R / G / B) G / B ') of the three-color input data (R / G / B) when the four-color data (R' / G '/ B' It is possible to reduce the deterioration rate and the deterioration rate of each sub-pixel of the unit pixel by dispersing the usage amount and the deterioration amount of the pixel with respect to the white sub-pixel to other sub-pixels.

FIG. 6 is a table showing the amounts of use of respective sub-pixels according to the conventional and the four-color data of the present invention converted from the three-color input data of the previous and current frames. 6 shows that the reference value according to the three-color input data (R / G / B) of the previous frame is larger than the maximum gradation value and the reference value according to the three- And the white data W of the current frame is generated as the black gradation value.

6, since the white data W of each of the previous and current frames is generated as the minimum gray-scale value of each of the three-color data (R / G / B), conventionally, It is concentrated. On the other hand, in the present invention, the white data W of the previous frame is generated as the minimum gradation value of each of the three color data R / G / B, the current frame white data W is the black gradation value 0, The usage amount of the white sub-pixels is distributed to the remaining red, green, and blue sub-pixels in the present invention. Accordingly, it can be seen that the average usage amount of each of the red, green, blue and white sub-pixels according to the present invention is also dispersed, so that the average usage deviation and the maximum average deviation among the red, green, have. That is, in the case of the three-color input data (R / G / B) of each of the previous and current frames in FIG. 6, the maximum average deviation of the present invention is reduced to 10 while the conventional maximum average deviation is 15.

FIG. 7 is a table showing the usage amounts of the sub-pixels according to the conventional and comparative example 1 four-color data converted from the three-color input data of the previous and current frames.

In the comparative example 1, the reference value according to the three-color input data (R / G / B) of the previous frame is larger than the maximum gradation value and the reference value according to the three- And the white data W of the current frame is generated as the black gradation value.

As can be seen from FIG. 7, the maximum average deviation of the conventional and comparative example 1 is the same, but the average usage of each of the red, green, blue, and white subpixels in Comparative Example 1 increases.

FIG. 8 is a table showing the usage amounts of the sub-pixels according to the conventional and the four-color data of the second comparative example converted from the three-color input data of the previous and current frames.

In the comparative example 2, the reference value according to the three-color input data (R / G / B) of the previous frame is equal to or smaller than the maximum gradation value and the reference value according to the three- And the white data W of the current frame is generated as the black gradation value O when it is larger than the maximum gradation value.

As can be seen from FIG. 8, the conventional maximum average deviation is 20, while the maximum average deviation of Comparative Example 2 is increased to 25.

FIG. 9 is a table showing the usage amounts of the respective sub-pixels according to the conventional and the four-color data of the second comparative example converted from the three-color input data of the previous and current frames.

In the comparative example 2, the reference value according to the three-color input data (R / G / B) of the previous frame is equal to or smaller than the maximum gradation value and the reference value according to the three- (W) of the current frame is generated as the black gradation value (O) when it is equal to or larger than the maximum gradation value.

As can be seen from FIG. 9, the conventional maximum average deviation is 45, while the maximum average deviation of the comparative example 3 is increased to 50.

10 is a view showing a comparison between the ratio of the amount of usage and the minimum amount of use of each sub pixel according to the conventional and the four-color data of the present invention converted from a television moving picture of a plurality of frames.

As can be seen from FIG. 10, it can be seen that the ratio of the average usage amount and the minimum usage amount of the white sub-pixels is relatively higher than that of the other sub-pixels. On the other hand, in the present invention, it can be seen that the average usage amount of the white subpixels is dispersed to other subpixels, and the ratio of each subpixel to the minimum usage amount is uniform.

6 to 10, when the reference value according to the three-color input data (R / G / B) of the previous frame is larger than the maximum gradation value and the three colors of the current frame The average usage amount of each sub pixel of the unit pixel can be dispersed by generating the white data W of the current frame as the black gradation value only when the reference value according to the input data R / G / B is larger than the maximum gradation value , And the average usage deviation and the maximum average deviation between the sub-pixels of the unit pixel can be reduced.

In the driving apparatus for a flat panel display according to the present invention, each of the sub-pixels P includes the organic light emitting diode OLED and the pixel circuit PC, And each of the sub-pixels P may be a liquid crystal cell or a discharge cell. That is, the driving apparatus of the flat panel display according to the embodiment of the present invention may be applied to an organic light emitting display, a liquid crystal display, or a plasma display panel.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: data conversion apparatus 110: data analysis unit
112: tone value extraction unit 114: reference value generation unit
116: storage unit 120: mode signal generating unit
121, 123: comparing unit 125: mode determining unit
127: memory 130: four-color data generating unit
210: display panel 220:
230: panel driver 232: timing controller
234: scan drive circuit unit 236:

Claims (14)

Color input data is analyzed to extract a maximum gray-scale value and a minimum gray-scale value for each unit pixel of each of the previous and current frames, and a weight value set for a minimum gray-scale value for each unit pixel of each of the extracted previous and current frames is reflected, A data analyzer for generating a reference value for each unit pixel of each current frame;
A mode signal generator for generating a data conversion mode signal of a first or second logic state for determining a data conversion mode based on a maximum gradation value and a minimum gradation value for each unit pixel of the previous and current frames; And
And a four-color data generator for generating four-color data consisting of white data and three-color correction data reflecting the white data by analyzing the three-color input data according to the data conversion mode signal,
Wherein the data conversion mode signal of the current frame having the first logic state has a reference value for each unit pixel of the current frame greater than a maximum gray-scale value for each unit pixel of the current frame corresponding to the current frame, Is greater than a maximum gray-scale value for each unit pixel of the previous frame corresponding to the first frame, and is generated when the data conversion mode signal of the previous frame is a second logic state,
Wherein the data conversion mode signal of the current frame having the second logic state is a data conversion mode signal of the current frame when the reference value of each unit pixel of the current frame is equal to or smaller than a maximum gray- And when the data conversion mode signal of the previous frame is in the first logic state, if the data conversion mode signal of the previous frame is the first logic state,
Wherein the four-color data generating section generates the tone value of the white data as a black tone value or a tone value based on the three-color input data in accordance with the data conversion mode signal. The method according to claim 1,
Wherein the four-
And sets the minimum gradation value of the three-color input data as the white data according to the data conversion mode signal of the first logic state,
And sets the black gradation value to the white data according to the data conversion mode signal of the second logic state. The method according to claim 1,
And the weight is 2. [ The method according to claim 1,
The mode signal generator generates a reference gray level value for each unit pixel of each of the previous and current frames, a reference gray level value for each of the previous and current frames, and a data conversion mode signal of a previous frame of the first or second logic state, And generates a data conversion mode signal of a current frame of the first or second logic state according to the data conversion mode signal. A display panel including a plurality of unit pixels made up of red, green, blue, and white sub-pixels formed in pixel regions defined by intersections of a plurality of scan lines and a plurality of data lines;
A data converter for analyzing input three-color input data to generate four-color data consisting of three-color correction data to be supplied to each of the red, green and blue sub-pixels and white data to be supplied to the white sub-pixel; And
And a panel driver for supplying a scan signal to the scan lines, converting the four-color data into data voltages, and supplying the data voltages to the data lines,
Wherein the data conversion unit includes the data conversion device according to any one of claims 1 to 4. The three-color input data is analyzed to extract a maximum gray-scale value and a minimum gray-scale value for each unit pixel of each of the previous and current frames, and a weight is added to the minimum gray- (A) generating a reference value for each unit pixel of each frame;
(B) generating a data conversion mode signal of a first or second logic state for determining a data conversion mode based on a maximum gradation value and a minimum gradation value for each unit pixel of the previous and current frames; And
(C) analyzing the three-color input data according to the data conversion mode signal to generate four-color data including white data and three-color correction data reflecting the white data,
Wherein the data conversion mode signal of the current frame having the first logic state includes a reference gray value of the current frame corresponding to a unit pixel of the current frame, Is greater than a maximum gray-scale value for each unit pixel of the previous frame corresponding to the data, and is generated when the data conversion mode signal of the previous frame is a second logic state,
Wherein the data conversion mode signal of the current frame having the second logic state is a data conversion mode signal of the current frame when the reference value of each unit pixel of the current frame is equal to or smaller than a maximum gray- And when the data conversion mode signal of the previous frame is in a first logic state, if the data conversion mode signal of the previous frame is the first logic state,
Wherein the white data has a gradation value based on a black gradation value or the three-color input data in accordance with the data conversion mode signal. The method according to claim 6,
The step (C)
The minimum gray level value of the three-color input data is set as the white data according to the data conversion mode signal of the first logic state,
And sets the black gradation value to the white data according to the data conversion mode signal of the second logic state. The method according to claim 6,
And the weight is 2. [ The method according to claim 6,
Wherein the step (B) comprises: comparing the maximum gray-scale value of each of the previous and current frames with a maximum gray-scale value of each of the previous and current frames, a reference value for each unit pixel of each of the previous and current frames corresponding thereto, And generates a data conversion mode signal of a current frame of a first or second logic state according to a signal. There is provided a method of driving a flat panel display device including a plurality of unit pixels including red, green, blue, and white sub-pixels formed in pixel regions defined by intersections of a plurality of scanning lines and a plurality of data lines,
Generating four-color data consisting of three-color correction data to be supplied to each of red, green and blue sub-pixels and white data to be supplied to the white sub-pixel by analyzing input three-color input data;
Supplying a scan signal to the scan line, converting the four-color data into a data voltage, and supplying the data voltage to the data line,
Wherein the step of generating the four-color data includes the data conversion method according to any one of claims 6 to 9. delete delete delete delete

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