KR20140059386A - Apparatus and method for converting data, and display device - Google Patents

Apparatus and method for converting data, and display device Download PDF

Info

Publication number
KR20140059386A
KR20140059386A KR1020120125776A KR20120125776A KR20140059386A KR 20140059386 A KR20140059386 A KR 20140059386A KR 1020120125776 A KR1020120125776 A KR 1020120125776A KR 20120125776 A KR20120125776 A KR 20120125776A KR 20140059386 A KR20140059386 A KR 20140059386A
Authority
KR
South Korea
Prior art keywords
data
gradation
luminance
histogram
unit
Prior art date
Application number
KR1020120125776A
Other languages
Korean (ko)
Other versions
KR102021006B1 (en
Inventor
임경호
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020120125776A priority Critical patent/KR102021006B1/en
Publication of KR20140059386A publication Critical patent/KR20140059386A/en
Application granted granted Critical
Publication of KR102021006B1 publication Critical patent/KR102021006B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/40—Analysis of texture
    • G06T7/41—Analysis of texture based on statistical description of texture
    • G06T7/44—Analysis of texture based on statistical description of texture using image operators, e.g. filters, edge density metrics or local histograms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Probability & Statistics with Applications (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention relates to a data conversion apparatus and method, and a display apparatus, which can reduce power consumption by distributing luminance according to data in a high gradation region, and a data conversion apparatus according to the present invention is a data conversion apparatus, A data separator for separating input data into luminance data and color difference data; A histogram generating unit configured to generate a histogram consisting of frequency numbers for each gradation level of the luminance data and to correct luminance data of each unit pixel so that the frequency of each gradation level included in the high gradation dispersion range set in the frequency distribution of the gradation levels in the histogram is distributed, A dispersion part; And a correction data generation unit for generating correction data of each unit pixel based on the corrected luminance data and the color difference data of each unit pixel.

Description

TECHNICAL FIELD [0001] The present invention relates to a data conversion apparatus and a data conversion apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a data conversion device and method capable of reducing power consumption and a display device.

2. Description of the Related Art [0002] In recent years, display devices having various forms and uses have emerged along with the rapid development of computers and the spread of the Internet. These display devices are mounted on various devices ranging from large-area display devices such as digital televisions, smart televisions, 3D televisions and monitors to small and convenient portable devices such as mobile phones, PDAs, smart phones and tablet computers.

The display device may be classified into a non-emission type display device such as a liquid crystal display device and a self-emission type display device such as a plasma display device and an organic light emitting display device.

The liquid crystal display device, which is a non-emission type display device, basically transmits light incident from a backlight unit using a liquid crystal layer, converts light transmitted through the color filter into color light, Display. The luminance of such a liquid crystal display device is determined by the luminance of the backlight unit irrespective of the video signal.

The organic light emitting display device of the self-emission type display device electrically excites a light emitting layer formed between the anode electrode and the cathode electrode to emit light of a color hue according to the type of the light emitting layer to display a predetermined color image. The luminance of the organic light emitting display device is determined by the intensity of a current corresponding to a video signal supplied to the light emitting layer.

The non-emission type display device has a constant power consumption regardless of a video signal, but the self-emission type display device has a power consumption proportional to a current flowing according to a video signal.

As a conventional technique for reducing the power consumption of the non-emission type display device, Korean Unexamined Patent Application Publication No. 2005-0061797 (hereinafter referred to as "Prior Art Document 1") receives an average luminance value, To reduce the amount of light when the average luminance value is larger than the reference value and to reduce the power consumption by increasing the light amount when the average luminance value is smaller than the reference value, thereby preventing the overall luminance deterioration.

As a conventional technology for reducing the power consumption of the self-emission type display device, Korean Unexamined Patent Publication No. 2004-0069583 (hereinafter referred to as "Prior Art Document 2") calculates an average luminance level of an input image, When the average luminance level is lower than the reference, a technique of calculating the difference between the average luminance levels between frames and reducing the power consumption of the current frame is disclosed.

However, since both of the prior art documents 1 and 2 reduce the power consumption based on the average luminance level of the image, the distribution of the luminance level of each gradation is concentrated in the low gradation region and the high gradation region, There is a problem that the efficiency of reducing power consumption is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data conversion apparatus and method, and a display apparatus, which can reduce power consumption by distributing luminance according to data in a high gradation region.

According to an aspect of the present invention, there is provided a data conversion apparatus including a data separator for separating input data of each unit pixel of an input image into luminance data and color difference data; A histogram generating unit configured to generate a histogram consisting of frequency numbers for each gradation level of the luminance data and to correct luminance data of each unit pixel so that the frequency of each gradation level included in the high gradation dispersion range set in the frequency distribution of the gradation levels in the histogram is distributed, A dispersion part; And a correction data generation unit for generating correction data of each unit pixel based on the corrected luminance data and the color difference data of each unit pixel.

Wherein each of the input data and the correction data of each unit pixel includes red, green, and blue data, or red, green, blue, and white data.

Wherein the data conversion apparatus further comprises a four-color data generation section for generating four-color data composed of red, green, blue, and white data based on the correction data supplied from the correction data generation section, And the correction data are each composed of red, green, and blue data.

According to an embodiment of the present invention, there is provided a display device including a display panel including a plurality of unit pixels each including a plurality of sub-pixels formed in pixel regions defined by intersections of a plurality of scan lines and a plurality of data lines, ; A data conversion unit for correcting input data of each unit pixel to generate correction data; And a panel driver for supplying a scan signal to the scan line, converting the correction data to a data voltage, and supplying the data voltage to the data line.

Each of the unit pixels includes red, green, and blue sub-pixels or red, green, blue, and white sub-pixels.

Wherein each of the unit pixels includes red, green, blue, and white sub-pixels, and the data conversion unit generates four-color data for generating four-color data consisting of red, green, And the panel driving unit converts the four-color data into a data voltage and supplies the data voltage to the data line.

According to an aspect of the present invention, there is provided a data conversion method comprising: (A) dividing input data of each unit pixel of an input image into luminance data and color difference data; A step of generating a histogram consisting of the frequency numbers of the gradation levels of the luminance data and correcting the luminance data of each unit pixel so that the frequency of each gradation level included in the high gradation dispersion range set in the frequency range of the gradation level of the histogram is dispersed (B); And (C) generating correction data of each unit pixel based on the corrected luminance data and the color difference data of each unit pixel.

According to a solution to the above problem, the data conversion apparatus, the method, and the display apparatus according to the present invention reduce the power consumption according to the input image by distributing the distribution of the luminance data included in the high gradation region among the luminance data of each unit pixel .

1 is a block diagram schematically showing a data conversion apparatus according to a first embodiment of the present invention.
2 is a block diagram schematically showing the configuration of the luminance dispersion unit shown in FIG.
3 is a flowchart for explaining a data conversion method using the data conversion apparatus according to the first embodiment of the present invention.
FIG. 4 is a diagram illustrating a histogram of input data and correction data of an input image, respectively, in the data converting apparatus and the data converting method according to the first embodiment of the present invention.
5 is a block diagram schematically showing a data conversion apparatus according to a second embodiment of the present invention.
6 is a block diagram schematically showing a data conversion apparatus according to a third embodiment of the present invention.
7 is a block diagram schematically showing a display device according to an embodiment of the present invention.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

Meanwhile, the meaning of the terms described in the present specification should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

Hereinafter, preferred embodiments of a display apparatus and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram schematically showing a data conversion apparatus according to a first embodiment of the present invention, and FIG. 2 is a block diagram schematically showing a configuration of a luminance distribution unit shown in FIG.

1 and 2, the data conversion apparatus 100 according to the first embodiment of the present invention includes a data separation unit 110, a luminance distribution unit 120, and a correction data generation unit 130 .

The data separator 110 divides input data DATA1 for each unit pixel of the input image into luminance data Y and color difference data YCbCr based on a color format conversion algorithm or a conversion function set to convert RGB to YCbCr (RGB to YCbCr) (CbCr). That is, the data separator 110 separates luminance data (Y) and color difference data (CbCr) from red, green, and blue data, which are input data (DATA1) of one unit pixel. Here, the data separator 110 reads the input data DATA1 for each unit pixel in a memory unit (not shown) in which the input data DATA1 for each unit pixel of the input image is stored in units of frames, The input data DATA1 for each unit pixel can be separated into the luminance data Y and the color difference data CbCr, but the present invention is not limited thereto.

The luminance distribution unit 120 distributes the luminance data included in the high gradation region among the luminance data Y of each unit pixel of the input image to reduce the power consumption of the input image. That is, the luminance distribution unit 120 generates a histogram H of the input image, which is composed of the frequency numbers of the luminance data Y for each gradation level, based on the luminance data Y supplied from the data separation unit 110 , Corrects the luminance data (Y) so that the frequency of each of the high gradation levels included in the high gradation level range set in the frequency gradations of the gradation level in the histogram (H) is distributed, and then corrects the corrected luminance data And supplies it to the data generation unit 130.

Specifically, the luminance distribution unit 120 calculates an average picture level (H-WAPL) in which a weight for high gradation is reflected by a linear weight function from a histogram H for the input image, (G'min) and the maximum variance gradation value (G'max) of the high gradation dispersion range according to the average image level (H-WAPL) ), The maximum variance gradation value (G'max), and the maximum gradation value of the input data (DATA1). The luminance distribution unit 120 includes a histogram generation unit 122, an average image level calculation unit 124, a dispersion range setting unit 126, and a luminance correction unit 128.

The histogram generator 122 divides all the luminance data Y of one frame supplied from the data separator 110 into gradation level units and counts the frequency of the luminance data Y corresponding to each gradation level Thereby generating a histogram H consisting of the frequency (or ratio) of each gradation level. At this time, when the input data DATA1 is 8 bits, the histogram generation unit 122 generates a histogram H consisting of frequency numbers of the respective gradation levels from the 0th gradation level to the 255th gradation level. Accordingly, the shape of the histogram H according to the frequency of each gradation level with respect to the input image is variously generated according to the luminance data Y for the input image in the frame unit. For example, the histogram H indicates a white peak in which the frequency of each gradation level is concentrated in the high gradation region, a black peak concentrated in the low gradation region of each gradation level, (Gauss) that increases from each of the gradation and the high gradation to the intermediate gradation region, or a black / white peak (black / white peak) in which the frequency of each gradation level is concentrated in each of the low gradation and high gradation regions have.

The average image level calculating unit 124 calculates an average image level (H-WAPL) from the histogram (H) supplied from the histogram generating unit 122 by weighting the high gray level by a linear weight function. Specifically, the average image level calculating unit 124 calculates the average image level of the histogram H and the frequency H (g) of the histogram H with respect to each of the gradation levels of the histogram H, as shown in the following equation (1) (GxH (g) xB (g)) of the linear weight function B (g) for the high gradation and the linear weight function B (g) for the high gradation (G) × B (g)) of the linear weight function B (g) and the frequency (H (g)) for each gradation level of the histogram H are accumulated (Denominator in Equation (1)), and then calculates the average image level (H-WAPL) by dividing the first accumulated value by the second accumulated value.

Figure pat00001

In Equation (1), g denotes a gradation level of the histogram, T denotes a maximum gradation value according to the number of bits of the input data (DATA1), 255 when the input data is 8 bits, H ) Denotes a frequency corresponding to the gradation level in the histogram and B (g) denotes a linear weight function for the high gradation and represents the maximum gradation value T of the input data with respect to the gradation level g of the histogram H Lt; / RTI >

As described above, the average image level calculator 124 reflects the linear weight function B (g) for the high gray level to the cumulative average value of the frequency of each gray level so that the average image level (H-WAPL). At this time, the average image level (H-WAPL) is normalized to a value ranging from 0 to 1 and supplied to the dispersion range setting unit 126. Here, an average image level of 0 (H-WAPL) means that the input image is completely black, and an average image level of 1 (H-WAPL) means that the input image is completely white do.

The distribution range setting unit 126 distributes the luminance data of the high gradation corresponding to the input data of the high gradation of the input image and supplies it to the average image level calculation unit 124 in order to reduce the power consumption according to the input image. (G'min) and the maximum dispersion gradation value (G'max) of the high gradation dispersion range are set based on the average image level (H-WAPL). That is, the dispersion range setting unit 126 adjusts the minimum dispersion gradation value of the high gradation dispersion range set in accordance with the average image level (H-WAPL) so that the high gradation level distribution is obtained so that the frequency of each gradation level included in the high gradation region is dispersed The dispersion range is narrowed or broadened. In other words, as the average image level (H-WAPL) approaches zero corresponding to a relatively dark image, the dispersion range setting unit 126 narrows the high gradation dispersion range and the average image level (H-WAPL) The variance range setting unit 126 widens the range of the high gray scale variance as the brightness range becomes closer to 1 corresponding to a bright image. As a result, the dispersion range setting unit 126 sets the high gradation dispersion range relatively narrow for a dark input image having relatively low power consumption, and sets a high gradation dispersion range for a bright input image having relatively high power consumption By setting it relatively wide, the power consumption according to the input image is reduced.

For example, when the input data is 8 bits, the variance range setting unit 126 sets the variance range setting unit 126 from 128 minimum variance gradation values (G'min) to 255 (H'-WAPL) according to an average image level (G'max), and sets a high gradation dispersion range from a minimum dispersion gradation value (G'min) of 200 to a maximum dispersion (G'max) of 255 according to an average image level (H-WAPL) (G'max), and a minimum variance gradation value G'min (H'-max) in the range of 129 to 199 according to an average image level (H-WAPL) ) To a maximum variance gradation value (G'max) of 255 can be set.

The brightness correction unit 128 adjusts the brightness of the input image based on the minimum dispersion gradation value G'min and the maximum dispersion gradation value G'max of the high gradation dispersion range set and supplied by the dispersion range setting unit 126, The luminance data Y supplied from the data separator 110 is corrected based on the maximum gradation value T of the data DATA1. Specifically, the brightness correction unit 128 subtracts (-) the maximum variance tone value G'max and the minimum variance tone value G'min (-) as shown in the following equation (2) (÷) of the result (G'max-G'min) of the operation (-) to the maximum gradation value (T) of the input data (DATA1) (G'max-G'min) / T) Y) of the multiplication operation (X) after multiplying the luminance data (Y) by the luminance data (G'min) And generates the corrected luminance data Y 'by adding (+) the minimum variance tone value G'min. The luminance correction unit 128 corrects the luminance data Y of each unit pixel of the input image through an operation of Equation (2) below to disperse the frequency of the luminance data included in the high gradation dispersion range.

Figure pat00002

The correction data generation unit 130 generates a correction data based on a color format conversion algorithm that is set to convert YCbCr to RGB (YCbCr to RGB) or a correction format of the corrected luminance data of each unit pixel supplied from the luminance distribution unit 120 Green and blue data based on the color difference data CbCr supplied from the data separator 110 so as to correspond to the color difference data Y ' And outputs correction data (DATA2) of each unit pixel to the outside.

Here, the correction data generation unit 130 outputs the correction data Ri ', Gi', and Bi 'to the display device or the input data DATA1 for each unit pixel of the input image stored in the memory unit (not shown) The correction data DATA2 can be written to the memory unit (not shown) so that the correction data DATA2 is updated with the correction data DATA2.

3 is a flowchart for explaining a data conversion method using the data conversion apparatus according to the first embodiment of the present invention.

The data conversion method according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

First, input data (DATA1) for each unit pixel of the input image is separated into luminance data (Y) and color difference data (CbCr) (S100). The step S100 is performed by the data separator 110, and a duplicate description thereof will be omitted.

Then, a histogram (histogram) H of the input image composed of the frequency numbers of the gradation levels of the luminance data Y is generated on the basis of the luminance data Y, and the histogram H of the high gradation The luminance data Y is corrected so that the frequency of each of the high gradation levels included in the dispersion range is dispersed (S200). The S200 process is performed in the luminance dispersion unit 120 described above, and will be described in detail as follows.

First, all luminance data (Y) of one frame is divided into gradation level units, and the number of frequencies of the luminance data (Y) corresponding to each gradation level is counted to obtain a histogram (H) composed of frequency numbers (or ratios) (S210). The process of S210 is performed by the histogram generator 122 of the brightness distribution unit 120 described above, and a duplicate description thereof will be omitted.

Then, an average image level (H-WAPL) is calculated by weighting the high gray level by the linear weight function B (g) from the histogram H for the input image (S220). The S220 process is performed by the average image level calculator 124 of the brightness distribution unit 120 through the calculation of Equation (1), and a duplicate description thereof will be omitted.

Next, a high gradation dispersion range having a minimum dispersion gradation value (G'min) and a maximum dispersion gradation value (G'max) is set according to the calculated average image level (H-WAPL) (S230). The process of step S230 is performed by the dispersion range setting unit 126 of the luminance dispersion unit 120 described above, and a duplicated description thereof will be omitted.

Subsequently, the luminance data Y is corrected in accordance with the set minimum gradation value G'min, the maximum variance gradation value G'max, and the maximum gradation value of the input data DATA1 (S240). The step S240 is performed by the brightness correction unit 128 of the brightness distribution unit 120 through the calculation of Equation (2), and a description thereof will not be repeated.

Then, correction data (DATA2) of each unit pixel composed of red, green, and blue data is generated based on the corrected luminance data (Y ') and the corresponding color difference data (CbCr) of each unit pixel ). The above-described S300 process is performed by the correction data generator 130 described above, and redundant description thereof will be omitted.

FIG. 4 is a diagram illustrating a histogram of input data and correction data of an input image, respectively, in the data converting apparatus and the data converting method according to the first embodiment of the present invention.

First, in the case of the input image of the comparison 1, the histogram according to the input data has a black and white peak shape in which the frequency of each gradation level is concentrated in each of the low gradation region and the high gradation region, It can be seen that the frequencies of the respective gradation levels included in the high gradation region with respect to the histogram according to the data are dispersed (see arrows in Fig. 4).

Next, in the case of the input image of the comparison 2, the histogram according to the input data has the white peak shape in which the frequency of each gradation level is concentrated in the high gradation region, but the histogram according to the correction data is the histogram corresponding to the input data. It can be seen that the frequency numbers of the respective gradation levels included in the gradation region are dispersed (see arrows in Fig. 4).

Therefore, in the data conversion apparatus and the data conversion method using the same according to the first embodiment of the present invention, the distribution of the luminance data included in the high gradation region among the luminance data (Y) of each unit pixel of the input image is dispersed, Power consumption can be reduced.

FIG. 5 is a block diagram schematically showing a data conversion apparatus according to a second embodiment of the present invention, which is an apparatus for supplying four-color data to a display device in which four different color sub-pixels constitute one unit pixel.

5, the data conversion apparatus 200 according to the second embodiment of the present invention includes a data separation unit 110, a luminance distribution unit 120, a correction data generation unit 130, (240).

The data separating unit 110, the brightness distributing unit 120 and the correction data generating unit 130 are respectively connected to the data converting apparatus 200 and the data converting apparatus 200 of the first embodiment of the present invention shown in FIGS. They are denoted by the same reference numerals, and redundant description thereof will be omitted.

The four-color data generator 240 converts the three-color correction data R ', G', and B 'of red, green, and blue of each unit pixel supplied from the correction data generator 130 into a predetermined algorithm And generates four-color data (DATA2) composed of red, green, blue, and white data. Here, the algorithm for converting the three-color correction data (R ', G', B ') into the four-color data (DATA2) may be set in various ways depending on the characteristics of luminance and / have.

For example, the four-color data generation unit 240 generates white data W based on the three-color correction data R ', G', and B 'of the red, green, And the 4th color data (R, G, B) of red, green, and blue corresponding to the generated white data W and the three color correction data R ', G' Thereby generating color data DATA2. At this time, the white data W may be set to the common tone value (or minimum tone value) of the three color correction data R ', G', B 'of the red, green and blue. For example, the four-color data generating unit 240 generates a common gray-level value from the three-color correction data R ', G' and B 'of red, green and blue as the white data W Green, and blue three-color data (R, G, B) corresponding to the three color correction data R ', G', B 'of red, green, .

As another example, the four-color data generator 240 generates white data W based on the three-color correction data R ', G' and B ', and outputs the generated white data W as red Green, and blue by generating three color data (R, G, B) of red, green, and blue by reflecting the three color correction data (R ', G' Color data (DATA2) consisting of the three-color data (R, G, B) and the white data (W). For example, the four-color data generation unit 240 of another example generates common color tone values as white data W from the three-color correction data R ', G', and B 'of red, (R, G, B) of the red, green, and blue by subtracting the white data (W) from each of the three color correction data (R ', G' Can be generated.

The data conversion method using the data conversion apparatus 200 according to the second embodiment of the present invention is similar to the data conversion method according to the first embodiment of the present invention shown in FIG. Green and blue tricolor correction data R ', G' and B 'on the basis of the generated three-color correction data R', G 'and B' Color data (DATA2) consisting of red, green, blue, and white data as shown in Fig.

FIG. 6 is a block diagram schematically showing a data conversion apparatus according to a third embodiment of the present invention, which is a device for supplying four-color data to a display device in which four different color sub-pixels constitute one unit pixel.

6, a data conversion apparatus 300 according to the third embodiment of the present invention includes a 4-color data generation unit 310, a data separation unit 320, a luminance distribution unit 330, (340).

The four-color data generator 310 analyzes the input data (DATA1) of each unit pixel made up of red, green, and blue data input on a frame-by-frame basis according to a predetermined algorithm to generate red, green, Thereby generating four-color data (R ', G', B ', W'). The four-color data generating unit 310 generates four-color data R ', G', B ', W' based on the input data DATA1, The data generation unit 240 is the same as the data generation unit 240, and therefore, the description thereof will be replaced with the above description.

The data separating unit 320 separates the four-color data of each unit pixel supplied from the four-color data generating unit 310 based on a color format conversion algorithm or a conversion function set to convert RGBW to YCbCr (RGBW to YCbCr) R ', G', B ', W') into luminance data (Y) and color difference data (CbCr). 1, except that the four color data R ', G', B 'and W' are separated into luminance data Y and color difference data CbCr. Is the same as that of the separating unit 110, so that the description thereof will be replaced with the above description.

The luminance distribution unit 330 generates a histogram H of an input image having a frequency number of the luminance data Y for each gradation level based on the luminance data Y supplied from the data separating unit 320, The luminance data (Y) is corrected so that the frequency of each of the high gradation levels included in the high gradation dispersion range set in the frequency number of the gradation level of the histogram (H) is distributed. The brightness distribution unit 330 is the same as the brightness distribution unit 120 shown in FIGS. 1 and 2, and therefore, the description thereof will be omitted.

The correction data generation unit 340 generates the correction data for each unit pixel supplied from the luminance distribution unit 330 based on the color format conversion algorithm or the conversion function set to convert YCbCr to RGBW (YCbCr to RGBW) Green, blue, and white data based on the color difference data CbCr supplied from the data separator 320 so as to correspond to the four color correction data (DATA2) And outputs the generated four-color correction data (DATA2) of each unit pixel to the outside.

The data conversion method using the data conversion apparatus 300 according to the third embodiment of the present invention will now be described.

First, the 4-color data (R ', G', B ', W') are generated by analyzing input data (DATA1) of each unit pixel input in a frame unit according to a predetermined algorithm. The four-color data (R ', G', B ', W') is generated by the four-color data generator 310.

Then, the four color data (R ', G', B ', W') of each unit pixel is separated into luminance data (Y) and color difference data (CbCr). The luminance data (Y) and the color difference data (CbCr) are generated by the data separator (320).

Then, luminance data (Y) is corrected according to the same procedure as S200 shown in FIG. The correction of the luminance data (Y) is performed in the luminance distribution unit (320).

Then, the four-color correction data (DATA2) of each unit pixel is generated based on the corrected luminance data (Y ') of each unit pixel and the corresponding color difference data (CbCr). The four-color correction data DATA2 is generated by the correction data generation unit 340. [

7 is a block diagram schematically showing a display device according to an embodiment of the present invention.

Referring to FIG. 7, a display device according to an embodiment of the present invention includes a display panel 410, a data converter 420, and a panel driver 430.

The display panel 410 emits light emitted from each unit pixel by emitting light from each of the organic light emitting elements OLED of the sub pixels P constituting the unit pixel according to the data voltage Vdata supplied from the panel driving unit 430 To display the image. The display panel 410 includes a plurality of data lines DL and a plurality of scan lines SL which are formed so as to intersect with each other and define pixel regions and a plurality of first data lines DL, 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.

The display panel 410 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 410 to receive a second driving power from the outside.

Each of the unit pixels is composed of red (R), green (G), and blue (B) subpixels P or red (R), green (G), blue (B) Of the sub-pixel P shown in FIG. Each sub-pixel P includes an organic light emitting element 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 430 to the data line DL in response to the scan signal SS supplied from the panel driver 430 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 sub-pixel (P), a threshold voltage deviation of the driving transistor is generated in accordance with the driving time of the driving transistor, and as a result, the image quality may be deteriorated. Accordingly, the organic light emitting display device 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 by storing the data voltage and the threshold voltage of the driving transistor together in a capacitor during a detection period for detecting a threshold voltage of the driving transistor.

The data converter 420 converts the brightness data of each unit pixel among the brightness data of each unit pixel based on input data DATA1 of the input image from an external system body (not shown) or a graphics card (not shown) And the correction data (DATA2) based on the corrected luminance data is generated and supplied to the panel driving section 430. The panel driving section 430 supplies the panel driving section 430 with correction data DATA2 based on the corrected luminance data. The data conversion unit 420 includes the data conversion apparatuses 100, 200, and 300 of the first, second, and third embodiments of the present invention described above with reference to FIGS. 1 to 6 , And a duplicate description thereof will be omitted.

When the data conversion unit 420 includes the data conversion apparatus 100 of the first embodiment, each unit pixel of the display panel 410 may include red (R), green (G), and blue (P) of the sub-pixel (B). When the data conversion unit 420 includes the data conversion apparatus 100 of the second or third embodiment, each unit pixel of the display panel 410 may include red (R), green (G) , Blue (B), and white (W) sub-pixels (P).

The panel driver 430 generates the scan control signal SCS and the data control signal DCS based on the input timing synchronization signal TSS and generates the scan signal SS according to the scan control signal SCS. And sequentially supplies the correction data DATA2 supplied from the data converter 420 to the data line DL in accordance with the data control signal DCS and supplies the corrected data DATA2 to the data line DL. Supply. The panel driver 430 includes a timing controller 432, a scan driver 434, and a data driver 436.

The timing controller 432 controls the timing of driving the scan driving circuit portion 434 and the data driving circuit portion 436 in accordance with a timing synchronization signal TSS input from an external system body (not shown) or a graphic card (not shown) . That is, the timing controller 432 generates a scan control signal SCS based on a timing synchronization signal TSS such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable DE, a clock DCLK, And drives the data driving circuit portion 436 through the data control signal DCS so as to synchronize with the driving timing control of the scanning driving circuit portion 434 through the scanning control signal SCS Timing.

The timing controller 432 aligns the correction data DATA2 supplied from the data converter 420 so as to be suitable for driving the display panel 410 and outputs the aligned data DATA3 to the data driving circuit unit 436 . Here, the aligned data DATA3 may be composed of red, green, and blue data or red, green, blue, and white data according to the sub-pixels constituting the unit pixel.

Meanwhile, the timing controller 432 may include the data converter 420. In this case, the data conversion unit 420 may be embedded in the timing control unit 432, and in this case, it may be embedded in a program form.

The scan driving circuit portion 434 generates a scan signal SS according to the scan control signal SCS supplied from the timing controller 432 and sequentially supplies the scan signal to the plurality of scan lines SL.

The data driving circuit unit 436 receives the alignment data DATA3 and the data control signal DCS from the timing controller 432 and receives a plurality of reference gamma voltages from an external power supply unit (not shown). The data driving circuit portion 436 converts the alignment data DATA3 into an analog data voltage Vdata using a plurality of reference gamma voltages in accordance with the data control signal DCS, To the corresponding data line DL of the pixel.

In the flat panel display device according to the embodiment of the present invention, the distribution of the luminance data included in the high gradation region among the luminance data of each unit pixel is also dispersed using the data converter 420, Can be reduced.

Meanwhile, in the display device according to the above-described embodiment of the present invention, each sub-pixel P is composed of the light emitting cells including the organic light emitting device OLED and the pixel circuit PC, Each sub-pixel P may be a liquid crystal cell or a discharge cell. That is, the display device according to the embodiment of the present invention can be applied to an organic light emitting display device, a liquid crystal display device, or a plasma display device.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

100, 200, 300: data conversion device 110, 320:
120, 330: luminance dispersion unit 130, 340: correction data generation unit
240, 310: four-color data generation unit 410: display panel
420: Data conversion unit 430:
432: timing control section 434: scan driving circuit section
436: Data driving circuit

Claims (17)

A data separator for separating input data of each unit pixel of the input image into luminance data and color difference data;
A histogram generating unit configured to generate a histogram consisting of frequency numbers for each gradation level of the luminance data and to correct luminance data of each unit pixel so that the frequency of each gradation level included in the high gradation dispersion range set in the frequency distribution of the gradation levels in the histogram is distributed, A dispersion part; And
And a correction data generation unit for generating correction data of each unit pixel based on the corrected luminance data and the color difference data of each unit pixel. The method according to claim 1,
Wherein the luminance distribution unit calculates an average image level based on a frequency coefficient for each gradation level of the histogram and a gradation level of the histogram and calculates a minimum image gradation value of the high gradation dispersion range And corrects the luminance data of each unit pixel according to the set minimum and maximum dispersion gradation values and the maximum gradation value of the input data. 3. The method of claim 2,
Wherein the luminance distribution unit calculates a first accumulation value in which a gradation level and a frequency of the histogram with respect to each gradation level of the histogram and a multiplication operation value of the linear weighting function are accumulated and calculates a frequency of each gradation level of the histogram, Calculating an average image level by dividing the first accumulation value by the second accumulation value after calculating a second accumulation value in which a multiplication operation value of the linear weighting function is accumulated,
Wherein the linear weight function is a division operation of a maximum gradation value of the input data with respect to a gradation level of the histogram. 3. The method of claim 2,
Wherein the luminance distribution unit sets the minimum and maximum dispersion gradation values so that the high gradation dispersion range is narrowed or broadened according to the average image level. 3. The method of claim 2,
Wherein the luminance distribution unit subtracts the maximum variance tone value and the minimum variance tone value, divides the result of the subtraction operation into the maximum tone value of the input data, and adds the luminance data to the result of the division operation And corrects the luminance data by adding the minimum variance gradation value to the result of the multiplication. 6. The method according to any one of claims 1 to 5,
Wherein each of the input data and the correction data of each unit pixel is composed of red, green, and blue data, or red, green, blue, and white data. 6. The method according to any one of claims 1 to 5,
And a four-color data generator for generating four-color data consisting of red, green, blue, and white data based on the correction data supplied from the correction data generator,
Wherein each of the input data and the correction data of each unit pixel comprises red, green, and blue data. A display panel including a plurality of unit pixels constituted by a plurality of sub-pixels formed in pixel regions defined by intersections of a plurality of scanning lines and a plurality of data lines;
A data conversion unit for correcting input data of each unit pixel to generate correction data; And
And a panel driver for supplying a scan signal to the scan line, converting the correction data to a data voltage, and supplying the data voltage to the data line,
Wherein the data conversion unit includes the data conversion device according to any one of claims 1 to 5. 9. The method of claim 8,
Wherein each unit pixel includes red, green, and blue sub-pixels or red, green, blue, and white sub-pixels. 9. The method of claim 8,
Wherein each unit pixel includes red, green, blue, and white sub-pixels,
Wherein the data conversion unit further comprises a four-color data generation unit for generating four-color data composed of red, green, blue, and white data based on the correction data,
Wherein the panel driver converts the four-color data into a data voltage and supplies the data voltage to the data line. (A) separating input data of each unit pixel of the input image into luminance data and color difference data;
A step of generating a histogram consisting of the frequency numbers of the gradation levels of the luminance data and correcting the luminance data of each unit pixel so that the frequency of each gradation level included in the high gradation dispersion range set in the frequency range of the gradation level of the histogram is dispersed (B); And
(C) generating correction data of each unit pixel based on the corrected luminance data of each unit pixel and the color difference data. 12. The method of claim 11,
The step (B)
Calculating an average image level based on a linear weight function of a frequency number of the histogram in each gradation level and a gradation level of the histogram;
Setting minimum and maximum dispersion gradation values of the high gradation dispersion range according to the calculated average image level; And
And correcting the luminance data of each unit pixel according to the set minimum and maximum dispersion gradation values and the maximum gradation value of the input data. 13. The method of claim 12,
Wherein the calculating the average image level comprises:
Calculating a first accumulation value in which a gradation level and a frequency of the histogram for each gradation level of the histogram and a multiplication operation value of the linear weighting function are accumulated;
Calculating a second cumulative value in which a frequency for each gradation level of the histogram and a multiplication operation value of the linear weight function are accumulated; And
And calculating the average image level by dividing the first accumulation value by the second accumulation value,
Wherein the linear weight function is a division operation of a maximum gradation value of the input data with respect to a gradation level of the histogram. 13. The method of claim 12,
Wherein the minimum and maximum dispersion gradation values are set so that the high gradation dispersion range is narrowed or widened according to the average image level. 13. The method of claim 12,
Wherein the step of correcting the luminance data of each unit pixel comprises a subtraction operation of the maximum variance tone value and the minimum variance tone value, a division of the result value of the subtraction operation into the maximum tone value of the input data, And the luminance data is corrected by multiplying the resultant value by the luminance data and adding the minimum variance gradation value to the result of the multiplication. 16. The method according to any one of claims 11 to 15,
Wherein the input data and the correction data of each unit pixel are composed of red, green, and blue data, or red, green, blue, and white data. 16. The method according to any one of claims 11 to 15,
And generating four-color data consisting of red, green, blue, and white data based on the correction data,
Wherein each of the input data and the correction data of each unit pixel comprises red, green, and blue data.
KR1020120125776A 2012-11-08 2012-11-08 Apparatus and method for converting data, and display device KR102021006B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120125776A KR102021006B1 (en) 2012-11-08 2012-11-08 Apparatus and method for converting data, and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120125776A KR102021006B1 (en) 2012-11-08 2012-11-08 Apparatus and method for converting data, and display device

Publications (2)

Publication Number Publication Date
KR20140059386A true KR20140059386A (en) 2014-05-16
KR102021006B1 KR102021006B1 (en) 2019-09-11

Family

ID=50889205

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120125776A KR102021006B1 (en) 2012-11-08 2012-11-08 Apparatus and method for converting data, and display device

Country Status (1)

Country Link
KR (1) KR102021006B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016195428A1 (en) * 2015-06-05 2016-12-08 삼성전자 주식회사 Method and apparatus for controlling image data
KR20170025292A (en) * 2015-08-28 2017-03-08 삼성전자주식회사 Display apparatus and display panel driving method thereof
US9928782B2 (en) 2015-04-29 2018-03-27 Lg Display Co., Ltd. Four-primary-color organic light emitting display and driving method thereof
US10580342B2 (en) 2017-11-10 2020-03-03 Samsung Display Co., Ltd. Image signal processing circuit, display device having the same, and image signal processing method of the display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007041535A (en) * 2005-07-08 2007-02-15 Seiko Epson Corp Image display device and image display method
KR20080059931A (en) * 2006-12-26 2008-07-01 엘지디스플레이 주식회사 Driving circuit for liquid crystal display device and method for driving the same
KR20120019915A (en) * 2010-08-27 2012-03-07 엘지디스플레이 주식회사 Gamma correction device and gamma correction method, apparatus and method for driving of display using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007041535A (en) * 2005-07-08 2007-02-15 Seiko Epson Corp Image display device and image display method
KR20080059931A (en) * 2006-12-26 2008-07-01 엘지디스플레이 주식회사 Driving circuit for liquid crystal display device and method for driving the same
KR20120019915A (en) * 2010-08-27 2012-03-07 엘지디스플레이 주식회사 Gamma correction device and gamma correction method, apparatus and method for driving of display using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9928782B2 (en) 2015-04-29 2018-03-27 Lg Display Co., Ltd. Four-primary-color organic light emitting display and driving method thereof
WO2016195428A1 (en) * 2015-06-05 2016-12-08 삼성전자 주식회사 Method and apparatus for controlling image data
US10713764B2 (en) 2015-06-05 2020-07-14 Samsung Electronics Co., Ltd. Method and apparatus for controlling image data
KR20170025292A (en) * 2015-08-28 2017-03-08 삼성전자주식회사 Display apparatus and display panel driving method thereof
US10580342B2 (en) 2017-11-10 2020-03-03 Samsung Display Co., Ltd. Image signal processing circuit, display device having the same, and image signal processing method of the display device

Also Published As

Publication number Publication date
KR102021006B1 (en) 2019-09-11

Similar Documents

Publication Publication Date Title
EP3013029B1 (en) Data conversation unit and method for data conversation and display device having data conversation unit
KR102207190B1 (en) Image processing method, image processing circuit and display device using the same
US8687025B2 (en) Display device and driving method thereof
KR101966393B1 (en) Display device and driving method thereof
US9640103B2 (en) Apparatus for converting data and display apparatus using the same
KR102207464B1 (en) Display apparatus and driving method thereof
KR20140071728A (en) Organic light emitting display device and method for driving theteof
US11114018B2 (en) Light emitting display device and method for driving same
KR20160019588A (en) Display apparatus and display method
US20220122556A1 (en) Image processing method, image processing circuit and display apparatus
KR20140070793A (en) Timing controller, driving method thereof, and display device using the same
KR20210116834A (en) Display device and driving method thereof
CN112150956A (en) Display device and method of driving display panel using the same
KR102090605B1 (en) Data converting circuit and display apparatus using the same
KR102021006B1 (en) Apparatus and method for converting data, and display device
KR20090021740A (en) Video data revision method for electron emission display device
KR102018752B1 (en) Apparatus and Method for Adjusting Luminance, Organic Light Emitting Display Device
KR101957354B1 (en) Method and apparatus for converting data, method and apparatus for driving of flat panel display device
KR102490628B1 (en) Image processing method, image processing module and display device using the same
KR101922072B1 (en) Method and apparatus for converting data, method and apparatus for driving of flat panel display device
KR101895996B1 (en) Organic Light Emitting Display Device and Driving Method Thereof
KR20170118467A (en) Organic light emitting display device
KR101761413B1 (en) Image quality enhancement method and display device using the same
KR20130079094A (en) Device and method for displaying images, device and method for processing images
KR20140063293A (en) Organic light emitting diode display device and method for driving the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant