KR20170038283A - Display device - Google Patents

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Publication number
KR20170038283A
KR20170038283A KR1020150137430A KR20150137430A KR20170038283A KR 20170038283 A KR20170038283 A KR 20170038283A KR 1020150137430 A KR1020150137430 A KR 1020150137430A KR 20150137430 A KR20150137430 A KR 20150137430A KR 20170038283 A KR20170038283 A KR 20170038283A
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data
unit
unit pixel
rgbw
pixel
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KR1020150137430A
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Korean (ko)
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권수현
김재홍
이희은
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엘지디스플레이 주식회사
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    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention relates to a display device, capable of improving readability of small text, comprising: a display panel including a first unit pixel composed of R, W, and G subpixels, a second unit pixel composed of W, B, and W subpixels, and a pixel structure in which the first unit pixel and the second unit pixel are alternately arranged in a horizontal and vertical direction; an image separation unit for analyzing RGB data to separate the RGB data into text data and background data; a first conversion unit and a second conversion unit for converting separated text data and background data into RWGWBW data; and a data arrangement unit for sorting and outputting each converted RWGWBW data.

Description

Display device {DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly, to a display device that improves readability of small-sized text.

Recently, a flat panel display device having advantages of thinning and low power consumption has appeared. Particularly, attention has been paid to a liquid crystal display (LCD) and an organic light emitting diode (OLED).

The flat panel display includes a display panel for displaying an image, and the display panel includes a plurality of unit pixels composed of R, G, and B sub-pixels.

In recent years, a display device having an RGBW pixel structure or an RWGWBW pixel structure in which at least one W subpixel is added to an RGB pixel structure in order to enhance the luminance has appeared.

A display device having a display panel in which R, G, and B subpixels are constituted by one unit pixel can display all colors in R, G, and B color combinations in an RGB pixel structure.

On the other hand, in the display panel having the RWGWBW pixel structure, some of the three subpixels constituting the unit pixel are composed of W subpixels.

≪ 6 & Accordingly, since each unit pixel does not include a part of R, G, and B subpixels, and the text data and the background data are mixed in the process of converting the RGB data into the RWGWBW data, It is necessary to improve the readability.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a display device capable of improving the readability of a small-sized text.

According to an aspect of the present invention, there is provided a display device capable of improving readability, including a first unit pixel including R, W, and G sub-pixels, W, B, And a second unit pixel composed of W subpixels, wherein the first unit pixel and the second unit pixel are alternately arranged in the horizontal and vertical directions; A first conversion unit and a second conversion unit for converting the separated text data and background data into RWGWBW data, a data converter for sorting and outputting the converted RWGWBW data, .

The display device according to the embodiment of the present invention having the above features has the following effects.

By converting RGB data into text data and background data and converting them into RWGWBW data, the readability of small texts can be improved.

1 is a plan view of a display device according to an embodiment of the present invention.
2 is a pixel structure diagram of a display device according to an embodiment of the present invention.
3 is a configuration diagram of an image processing unit according to an embodiment of the present invention.
4 is a diagram illustrating an example of a determination method of a text determination unit according to an embodiment of the present invention.
5 is a diagram illustrating an example in which an RWGWBW conversion unit according to an embodiment of the present invention converts W data of RGBW data into RWBWGW data.
6 is a diagram illustrating an example of converting RGB data of RGBW data into RWBWGW data in an RWGWBW conversion unit according to an embodiment of the present invention.
7 is a view showing an original data image, a conventional data-converted image, and an image after data conversion according to an embodiment of the present invention.

Hereinafter, a display device according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a display apparatus according to an embodiment of the present invention, FIG. 2 is a pixel structure of a display apparatus according to an embodiment of the present invention, and FIG. 3 is a configuration diagram of an image processing unit according to an embodiment of the present invention.

As shown in FIG. 1, a display device according to an embodiment of the present invention includes gate lines GL and data lines DL intersecting the gate lines GL, and data lines DL defined by intersections of the gate lines GL and the data lines GL, A gate driver GD for supplying a gate signal to the gate lines, a data driver DD for supplying RGB data to the data lines, (GD) and a timing controller (TC) for controlling the data driver (DD).

2, the pixel structure of the display panel 100 includes a first unit pixel composed of R sub-pixel 101, W sub-pixel 102, and G sub-pixel 103, A first sub-pixel 201, a B sub-pixel 202, and a W sub-pixel 203. In addition, a unit pixel adjacent in the lower direction of the first unit pixel composed of the R, W, and G subpixels includes a second subpixel 201 composed of a W subpixel 201, a B subpixel 202, and a W subpixel 203 Unit pixels are arranged. The unit pixel adjacent to the lower side of the second subpixel is a first unit pixel composed of the R subpixel 101, the W subpixel 102, and the G subpixel 103. That is, the unit pixels adjacent to the upper side, the lower side, the left side, and the right side of the first unit pixel are arranged in the second unit pixel, and the unit pixels adjacent to the upper side, the lower side, . As a result, the first unit pixel and the second unit pixel are arranged alternately in the horizontal direction and the vertical direction.

The timing controller TC generates the data control signal DCS and the gate control signal GCS using the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync and the clock signal CLK. The timing controller TC supplies the gate control signal GCS to the gate driver GD and the image data R, G and B data input from the external system to the configuration of the liquid crystal display panel PN And supplies the aligned image data R, G, and B Data together with the data control signal DCS to the data driver DD. The gate control signal GCS includes a gate start pulse, a gate shift clock, a gate output enable signal, and the like. The data control signal DCS includes a dot clock, a source shift clock, a source enable signal, .

The data driver DD outputs the image data RGB Data received from the timing controller TC to the data voltage of positive / negative polarity every frame or every horizontal display line according to the data control signal DCS And supplies the converted data to the data lines DL.

The gate driver GD supplies a gate pulse to the gate line GL in accordance with the gate control signal GCS input from the timing controller TC.

3 is a configuration diagram of an image processing unit according to an embodiment of the present invention. The image processing unit DP includes an image input unit 305 for receiving RGB data, an image separation unit 310 for analyzing the RGB data and separating the text data into background data and background data, A data conversion unit 330 for converting the converted RWGWBW data into data, and a data alignment unit 340 for aligning and outputting the converted RWGWBW data.

The image input unit 305 receives RGB data from the outside and outputs the RGB data to the image separation unit 310.

The image separation unit 310 includes an edge determination unit 311, a text determination unit 312, and a data distribution unit 313.

The edge determination unit 311 detects the edge of the RGB data. There are Sobel edge extraction method, Roberts edge extraction method, Laplacian edge extraction method, Canny edge extraction method, Non-Maxima Suppression method as methods for detecting edges. Most edge extraction methods use differential calculations. Since the data of the text area are in the same gradation level and the gradation difference between the text data and the background data is large, the edge information is detected at the boundary of the text area during differential calculation.

In the case of the Sobel edge extraction method, a 3 × 3 mask is used to detect edges in the vertical and horizontal directions. Since the text is arranged in the background, it is scanned in the background-text-background order. Thus, an edge is detected once at the background-text boundary, and an edge is detected again at the boundary of the text-background. As a result, the edges are formed in a double manner, and both the vertical and horizontal directions are detected. Thus, the edge forms a closed curve surrounding the text.

4 is a diagram illustrating an example of a determination method of a text determination unit according to an embodiment of the present invention.

The text determination unit 312 finds the closed curve from the detected edge information. Since the RGB data of the text are all the same, the RGB data at all positions in the closed curve area must be identical to each other. Therefore, when the distance between the edge and the edge is not more than the first threshold value and the vertical direction distance is less than or equal to the second threshold value at all positions within the closed curve region when all the RGB data are all the same in all the positions in the closed curve region, Is determined to be text data when the horizontal distance is less than or equal to the second threshold value and the vertical distance is less than or equal to the first threshold value.

The first threshold value and the second threshold value define the width and length of the strokes constituting the text, respectively. RWGWBW is a value for separately extracting and correcting a text having a certain size or less in readability in a display device having a pixel structure.

Since the display device according to the embodiment of the present invention needs to improve readability in the case of text having a size of 22 unit pixels or less, the first threshold value defining the width of the stroke is set to 4 unit pixels, The second threshold value is preferably set to 22 unit pixels. That is, when the size of the text character is 22 unit pixels, the line width does not exceed 4 unit pixel size. Accordingly, the first threshold value is set to 4 unit pixels, and the second threshold value is set to 22 unit pixels.

Referring to FIG. 4, there are two closed curves. When measuring the distance between the edge and the edge in the horizontal direction and the vertical direction at the specific position 390 in the closed curve on the left side, the vertical distance of the vertical direction A-A 'does not exceed 22 unit pixels in the horizontal direction B-B' Since it does not exceed the unit pixel of Fig. 4, it is determined as text data.

The distance in the direction D-D 'in the horizontal direction from the specific position 400 of the closed curve located on the right side in FIG. 4 exceeds 22 unit pixels and the vertical distance in the C-C' direction exceeds 4 unit pixels. Do not judge.

The data distribution unit 313 outputs the position and the text data of the unit pixel corresponding to the RGB data in the closed curve including the text information to the second conversion unit 332 and outputs the position of the unit pixel corresponding to RGB data outside the closed curve And the background data to the first conversion unit 331.

The first and second data conversion units 331 and 332 convert RGB data corresponding to the text unit pixels and the background unit pixels into RWGWBW data, respectively. Specifically, the data corresponding to the unit pixel not including the text data is converted by the second data conversion unit 332, and the data corresponding to the unit pixel including the text information is converted by the first data conversion unit 331 . When RWGWBW data is converted from RGB data, it performs weighting averaging with surrounding pixels, which makes the readability of the pixel in the text unit poor. Accordingly, the data conversion unit 330 can improve the readability of the character by separating the data corresponding to the text unit pixel and the data corresponding to the background unit pixel into the RWBWGW data.

The first conversion unit 331 converts RGB image data corresponding to a unit pixel to be displayed with text data into RWGWBW data.

When the unit pixel in which the text data is to be displayed is the first unit pixel, the RGB data (R, G, B) corresponding to the text unit pixel is R data, G data and B data, The W data is set to a value obtained by subtracting the minimum value from the R, G, and B data of the R, G, and B data of the R, G, and B data. That is, the RWG data can be represented by (R-MIN (R, G, B), MAX (R, G, B) .

If the unit pixel to be displayed with the text data is a second unit pixel composed of W, B and W subpixels, the RGB data (R, G, B) corresponding to the text unit pixel is converted into WBW data MAX (R, G, B) - MIN (R, G, B), B - MIN (R, G, B) That is, the W data of the WBW data is set to a value obtained by subtracting the minimum value from the maximum value among the R, G, and B data of the RGB data, and the B data of the WBW data is set to the R, G, B data, that is, the W data value of the WBW data.

The display device of the present invention corrects the W data of the text area in order to improve the readability of the small text because each unit pixel does not include all R, G, and B subpixels. The W data of the RWGWBW corresponding to the unit pixel in which the text data is to be displayed is converted into the W data of the RWGWBW by subtracting the minimum value among the R, G, and B data of the RGB data from the maximum value among the R, G, and B data of the RGB data Setting. In the case of converting into RGBW data in the same manner as described above, the readability of a small-sized text can be improved.

For example, when the text color is a pure B color, the first unit pixel composed of R, W, and G subpixels does not include B subpixels, and thus can not represent B colors. The W data of the RWBWGW is set to the difference between the largest value and the smallest value among the R, G, and B data of the RGB data, so that the W data has the same gray level value as the B data, and as the gray level of the B color becomes larger, The gradation of the B color becomes smaller as the gradation of the B color becomes smaller, and the read W color of the B color can be corrected so as not to be larger than the R color, the G color and the B color so that the readability of the text of a smaller size can be improved.

The second conversion unit 332 converts the RGB data corresponding to the unit pixel in which the background data not including the text data is displayed, into the RWBWGW data. The second conversion unit 332 includes an RGBW conversion unit 333 and an RWGWBW conversion unit 334.

The RGBW data converter 333 converts RGB data into RGBW data. (R, G, B) and G-min (R, G, and B) corresponding to the unit pixel in which the background data that does not include the text data is to be displayed, ), B-min (R, G, B), and min (R, G, B). That is, the W data of the RGBW data is set as the minimum value among the R, G, and B data of the RGB data, and the R, G, and B data of the RGB data are obtained by subtracting the W data of the RGBW data, , And B data.

FIG. 5 is a diagram illustrating an example in which an RWGWBW conversion unit according to an embodiment of the present invention converts W data of RGBW data into RWBWGW data, FIG. 6 illustrates an example of the RWGWBW conversion unit, which converts RGB data of RGBW data into RWBWGW And converting the data into data.

The process of calculating W sub-pixel data in the second conversion unit will be described with reference to FIG.

The data corresponding to the W subpixel 232 positioned at the center in the unit pixels 230 and 240 including the W subpixels is set as the W data 134 among the RGBW data 130 corresponding to the unit pixel 230 do.

The data of the W subpixel 241 located on the left side of the unit pixel is divided into the W data value 144 of the RGBW data corresponding to the unit pixel 240 and the unit pixel 130 adjacent to the left side of the unit pixel 240 The W data values 134 of the RGBW data are weighted averaged and set. The weight is weighted on the RGBW data 144 corresponding to the unit pixel 240 to be corrected.

The data of the W subpixel 243 positioned on the right side of the unit pixel 240 is divided into the W data 144 among the RGBW data 140 corresponding to the unit pixel 240 and the W data 144 on the right side of the unit pixel 240 W data 158 of the RGBW data 150 corresponding to adjacent unit pixels (not shown) is weighted averaged. The weight is weighted on the RGBW data 144 corresponding to the unit pixel 240 to be corrected.

The process of converting the R, G, and B data among the RGBW data into the RWGWBW data is as follows.

Referring to FIG. 6, when the unit pixel in which the background data is to be displayed is the first unit pixel, the R data R0 of the first unit pixel is the R data of the RGBW corresponding to the first unit pixel 150 (151, 153, 155, 154, and 157) of RGBW data corresponding to a unit pixel in which background data adjacent to the left, right, lower, lower left, and right sides of the first unit pixel are to be displayed, ) Are weighted averaged and set. The second color data of the first unit pixel is composed of the second color data of RGBW corresponding to the first unit pixel and the second color data of RGBW that are adjacent to the left, right, lower, lower left, and right sides of the first unit pixel, The second color data of the RGBW data corresponding to the unit pixel not including the second color data is weighted averaged. That is, a weighted average is performed except for a unit pixel including text information or when a unit pixel does not exist.

When the unit pixel on which the background data is to be displayed is a second unit pixel, the B data of the second unit pixel is divided into B data of RGBW corresponding to the first unit pixel and B data of RGBW corresponding to the left, , B data of RGBW data corresponding to the unit pixel in which the background data adjacent to the lower left and lower sides are to be displayed is weighted averaged and set. That is, a weighted average is performed except for a unit pixel including text information, or when a unit pixel does not exist.

That is, the weight of the RGBW data corresponding to the unit pixel to be corrected is increased, and the weight of the RGBW data value corresponding to the unit pixel adjacent to the right, lower, left, and right side of the unit pixel is made small. The following equation is expressed by the following equation.

Figure pat00001

In the equation (1), a formula for obtaining the data R 0, R 0 represents an R data of RWGWBW data, using the R 1 to R 6 of the RGBW data is obtained the R 0 of RWBWGW data. Where a to f are weights. The weight of the R 2 data of the RGBW data corresponding to the unit pixel in which the background data is to be displayed is increased. That is, the weight b is larger than the remaining weights a, c to f.

The data sorting unit 340 arranges and outputs the RWGWBW data from the first converting unit and the second converting unit.

7 is a view showing an original data image, a conventional data-converted image, and an image after data conversion according to an embodiment of the present invention.

7 (a) shows the original data image, FIG. 7 (b) shows the image after the conventional RWGWBW data conversion, and FIG. 7 (c) shows the image by the image processing unit according to the embodiment of the present invention . The image by the image processing unit according to the embodiment of the present invention can be saved in the text form of the original image and the readability of the text can be improved as compared with the image of FIG. 7 (c).

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: display panel 310:
311: edge determination unit 312: text determination unit
313: Data distribution unit 331: First conversion unit
332: second conversion unit 333: RGBW conversion unit
334: RWGWBW conversion section

Claims (7)

A first unit pixel composed of R, W, and G subpixels, and a second unit pixel composed of W, B, and W subpixels, wherein the first unit pixel and the second unit pixel are horizontal and vertical A display panel having a pixel structure alternately arranged in a direction of the display panel;
An image separator for analyzing the RGB data and separating the RGB data into text data and background data;
A first converting unit and a second converting unit converting the separated text data and background data into RWGWBW data, respectively;
And a data arrangement unit for sorting and outputting the converted RWGWBW data from the first conversion unit and the second conversion unit. The method according to claim 1,
Wherein the image separator comprises:
An edge determination unit for detecting an edge of the RGB data;
Wherein the edge determining section finds a closed curve area from the detected edge information of the rotor, and when the RGB data in the closed curve area are equal to each other, the horizontal distance between the edge and the edge at all positions within the closed curve is less than or equal to a first threshold value A text determination unit determining text data having text information when the direction distance is less than or equal to a second threshold or when the horizontal distance between the closed curved surfaces is less than or equal to a second threshold and the vertical distance is less than or equal to a first threshold; And
And a data distribution unit for outputting the position of the unit pixel corresponding to the closed curve area and the text RGB data to the first conversion unit and for outputting the position and background data of the unit pixel corresponding to the RGB data outside the closed curve area to the second conversion unit Display device. 3. The method of claim 2,
Wherein the first threshold value is set to 4 unit pixels, and the second threshold value is set to 22 unit pixels. The method according to claim 1,
Wherein the first conversion unit comprises:
(R, MIN, G, B) corresponding to the unit pixel in which the text data is to be displayed when the unit pixel to be displayed with the text data is the first unit pixel, MAX (R, G, B) -MIN (R, G, B)
(R, G, B) -MIN (R, G, B) to which the text data is to be displayed, if the unit pixel in which the text data is to be displayed is the second unit pixel ), B-MIN (R, G, B), and MAX (R, G, B) -MIN (R, G, B). The method according to claim 1,
The second conversion unit includes an RGBW data conversion unit for converting RGB data into RGBW data and an RWGWBW data conversion unit for converting RGBW data from the RGBW data conversion unit into RWGWBW data. 6. The method of claim 5,
Wherein the RGBW data conversion unit comprises:
(RGB) data (R-min (R, G, B), G-min (R, G, B) and B-min R, G, B) and min (R, G, B). 6. The method of claim 5,
Wherein the RWGWBW data conversion unit comprises:
If the unit pixel on which the background data is to be displayed is the first unit pixel,
Wherein the R data of the first unit pixel includes at least one of R, G, and B data of RGBW corresponding to the first unit pixel and unit data of the unit data in which background data adjacent to the left, right, lower, left, The R data of the RGBW data corresponding to the pixel is weighted averaged and set,
The W data of the first unit pixel is set as W data of RGBW data,
The second color data of the first unit pixel includes second color data of RGBW corresponding to the first unit pixel and second color data of RGBW corresponding to the unit pixels adjacent to the left, right, lower, lower left, The second color data of the corresponding RGBW data is weighted averaged,
If the unit pixel on which the background data is to be displayed is the second unit pixel,
The W data value of the W subpixel positioned at the left side in the second unit pixel corresponds to the W data value of the RGBW data corresponding to the second unit pixel and the RGB data corresponding to the background unit pixel adjacent to the left side of the second unit pixel The weighted average of the W data values is set,
The B data of the second unit pixel is divided into B data of RGBW corresponding to the first unit pixel and B data of the unit pixel to be displayed on the left, Weighted average of B data of RGBW data corresponding to the RGB data,
The W data value of the W subpixel positioned on the right side in the second unit pixel is a unit pixel on which the W data value of the RGBW data corresponding to the second unit pixel and the background data adjacent to the right side of the second unit pixel are displayed And weighting averages the W data values of the corresponding RGBW data.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114203113A (en) * 2020-09-17 2022-03-18 乐金显示有限公司 Display device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114203113A (en) * 2020-09-17 2022-03-18 乐金显示有限公司 Display device
US11468829B2 (en) 2020-09-17 2022-10-11 Lg Display Co., Ltd. Display device
CN114203113B (en) * 2020-09-17 2024-05-28 乐金显示有限公司 Display device

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