KR20190017285A - Multiprimary display device having wide color gamut - Google Patents

Abstract

The present invention relates to a multi-primary color display device having a wide color gamut. On a pixel array of a display panel, a first unit subpixel group including a red subpixel, a green subpixel, a blue subpixel, a bluish-green subpixel, a white subpixel, and a yellow subpixel is repeated or a second unit subpixel group including the red subpixel, the green subpixel, the blue subpixel, and the bluish-green subpixel is repeated. The multi-primary color display device may cope with a high dynamic range.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-

The present invention relates to a multi-primary color display device satisfying the BT.2020 color gamut.

Among the image quality indicators of the display device, the color recall rate is an index indicating how much the natural color can be expressed by the display device. The criterion of the color recall rate is the color coordinate. A color coordinate is a coordinate value indicating a color felt by a human by a point on a coordinate system. The higher the color recall ratio, the more colors can be displayed on the display device and the color closer to the actual environment can be expressed, so that it is used as a linkage indicator for reproducing a high-quality image.

There is an increasing demand for a display device satisfying the BT.2020 color space in the display device field. BT.2020 is the recommended specification of UHD display and UHC contents. The color coordinates of BT.2020 are super light color areas which can express wider colors in red (R), green (G), and blue (B) than BT.709 and also transcend DCI.

BT.2020 satisfies the pointer's gamut because it defines the color space to include all real world surface colors. Since the BT.2020 has a very wide gamut compared to the conventional one, the display solution for implementing the BT.2020 causes a large cost increase. In the case of a liquid crystal display (LCD), in order to satisfy the BT.2020, most of the physical components of the display panel, such as the color filter, the back light, and the optical sheet, must be newly developed, .

The present invention provides a multicolor display capable of covering the Pointer's gamut, which is the ultimate goal of BT.2020, and capable of coping with HDR (High Dynamic Range) by securing a wide dynamic range in the achromatic region.

And a display panel in which data lines and gate lines of the present invention are crossed and subpixels are arranged in a matrix form. A first unit subpixel group including a red subpixel, a green subpixel, a blue subpixel, a cyan subpixel, a white subpixel, and a yellow subpixel is repeated on a pixel array of the display panel, The second unit sub-pixel group including the sub-pixel, the blue sub-pixel, and the cyan sub-pixel is repeated. The color coordinates of the display panel satisfy the color coordinates of BT.2020.

The present invention can add a cyan subpixel to the RGB subpixels to cover the pointer's gamut of ultimate purpose of the BT.2020 gamut.

The present invention realizes a wide color gamut including the Pointer's gamut in addition to the cyan sub-pixels in the RGB sub-pixel and a wide dynamic range in the achromatic area by adding the white and yellow sub-pixels, Range). The multicolor display device of the present invention expresses pixel data of an input image mastered in the BT.2020 gamut in accurate color coordinates.

The present invention can realize an inexpensive wideband multi-color display satisfying BT.2020 by adding sub-pixels of cyan, white, and yellow to a conventional DCI-P3 RGB display device.

By adding white and yellow subpixels to the display panel, the present invention can solve the problem of the perceived luminance drop of a specific color in the H-K effect and realize the D65 reference peak luminance of HDR.

The present invention can implement a color arrangement structure of RGBCWY and a subpixel rendering algorithm to implement not only ICDM resolution but also triple resolution of UHD in the horizontal direction.

1 is a diagram showing an expected gamut when a cyan subpixel is added to a display device satisfying DCI-P3.
FIGS. 2A and 2B show the HK effect.
3 is a view showing a part of a pixel array in which red subpixels, green subpixels, blue subpixels, cyan subpixels, white subpixels and yellow subpixels are arranged.
Fig. 4 is a view showing the resolution in the horizontal direction in the arrangement of colors shown in Fig. 3; Fig.
Fig. 5 is a diagram showing resolution in the vertical direction in the arrangement of colors shown in Fig. 3; Fig.
6 is a view showing a multi-primary color subpixel arrangement of a display panel according to the first embodiment of the present invention.
7 is a view showing a multi-primary color subpixel arrangement of a display panel according to a second embodiment of the present invention.
8A to 8C are simulation results comparing gamut coverage of a DCI-P3 gamut display device in various images and a multi-color display device having an RGBCWY gamut shown in FIG.
FIGS. 9A and 9B are diagrams for explaining the color gamut coverage of the image mastered in the color space of BT.2020 when displaying image No. 4 in the display device of the comparative example and the multicolor display device of the present invention, Respectively.
10 is a view showing a display device according to an embodiment of the present invention.
11 is a view showing a color coordinate value in a display device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. To fully disclose the scope of the invention, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited to those shown in the drawings. Like reference numerals refer to like elements throughout the specification. In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

Where the term "comprises", "comprising", "having", "having", or the like is used herein, other parts may be added as long as "only" is not used. The singular forms of the components may be construed in plural unless otherwise expressly stated.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two components is described as 'on', 'on top', 'under', or 'next to' Quot; directly " or " direct " may be interposed between those components that are not used.

The first, second, etc. may be used to distinguish the components, but these components are not limited to the function or structure of the component or the names of components attached to the components.

The following embodiments can be combined or combined with each other partly or entirely, and technically various interlocking and driving are possible. Each embodiment may be feasible independently of one another and may be feasible in conjunction.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical constituent elements. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a diagram showing an expected gamut when a cyan (C) sub-pixel is added to a display device satisfying DCI-P3.

Referring to FIG. 1, there is the largest difference between the color coordinates of the DCI-P3 (or BT. 709) and the Pointer's gamut indicated by the dotted line in the cyan (C). In order to cover the Pointer's gamut, the present invention is applied to a display panel that satisfies the DCI-P3 (or BT. 709) to display red (R), green (G), and blue Adds cyan (C) subpixels as well as pixels.

In the case of a multiprimary display device which further includes primary colors other than the RGB sub-pixels, since the frequency of lighting of the added primary colors is low, the transmittance and luminance of the display panel may be lowered. In consideration of this, the present invention can further add a white sub-pixel to the display panel to prevent the transmittance decrease and increase the luminance of the achromatic color.

In the case of a photo-color display device in which color purity is improved, as shown in FIG. 2A, the perceived brightness enhancement effect of chromatic colors occurs due to the H-K effect. However, as shown in FIG. 2B, in the case of yellow (Y) and cyan (C), the cognitive brightness increasing effect due to the H-K effect is small.

The present invention can increase the perceived luminance of cyan (C) and increase the perceived luminance of yellow (Y) by adding a yellow (Y) subpixel to the display panel. Especially BT. 2020's white color temperature is based on D65 (6500K), so yellowish white is required. In view of this, a display panel to which a yellow (Y) sub-pixel is added can realize the color temperature of white light required in BT.2020.

FIG. 3 is a block diagram showing a structure of a red sub-pixel (hereinafter, referred to as "R sub-pixel"), a green sub-pixel A portion of the pixel array in which pixels (hereinafter referred to as " C subpixels "), white subpixels (hereinafter referred to as " W subpixels "), and yellow subpixels Fig.

Referring to FIG. 3, CWY subpixels are arranged along with RGB subpixels in each of the lines LINE1 and LINE2 of the display panel of the present invention.

When viewed in the column direction orthogonal to the line direction, the RGB subpixels and the CWY subpixels are shifted from each other. (C1, R), G sub-pixels (C2, G) are arranged in the order from the left to the right in the odd-numbered line or the first line LINE1 in the order of the column numbers of the first to sixth columns , B subpixels C3 and B, C subpixels C4 and C, W subpixels C5 and W and Y subpixels C6 and Y are sequentially arranged.

In the even-numbered line or the second line LINE2, the CWY sub-pixels are arranged in the first to third columns C1 to C3 and the RGB sub-pixels are arranged in the fourth to sixth columns C4 to C6. Thus, the C sub-pixel (C1, C), the W sub-pixel (C2, W), the Y sub-pixel (C3, Y), the R sub- (C4, R), G subpixels (C5, G), and B subpixels (C6, B) are sequentially arranged. Thus, it is assumed that C subpixels under R subpixels, W subpixels below G subpixels, Y subpixels below B subpixels, R subpixels below C subpixels, and W subpixels below The G subpixel is located below the Y subpixel and the B subpixel is located.

Such a color arrangement can realize the horizontal line resolution recognized by the International Committee for Display Metrology (ICDM) as shown in FIG. Further, as shown in FIG. 5, since each column can represent a vertical white line, three times the UHD, that is, 12K resolution can be realized.

6 is a view showing a multi-primary color subpixel arrangement of a display panel according to the first embodiment of the present invention. Is substantially the same as Fig. 3 in which the multi-primary-color subpixel arrangement shown in Fig. 6 is arranged. The unit subpixel group including 2 * 6 subpixels in which the first and second lines LINE1 and LINE2 and the first to sixth columns C1 to C6 are crossed is repeated on the pixel array of the display panel.

The white luminance in the multi-primary sub-pixel shown in Fig. 6 is 75%. In the case of these multi-primary subpixels, there is no problem in subpixel rendering, the possibility of deterioration in image quality is minimal, and the additional process in the manufacturing process is minimized.

7 is a view showing a multi-primary color subpixel arrangement of a display panel according to a second embodiment of the present invention. The display panel shown in Fig. 7 has no white subpixel W and no yellow subpixel Y.

Referring to FIG. 7, when viewed in the column direction orthogonal to the line direction, the RG subpixels and the BC subpixels are shifted from each other. (C1, R), G sub-pixels (C2, G) in the order of the column numbers of the first to fourth columns (C1 to C4) from the left to the right in the odd-numbered line or the first line (LINE1) , B subpixels (C3, B), and C subpixels (C4, C) are sequentially arranged.

In the even-numbered line or the second line LINE2, the BC sub-pixels are arranged in the first and second columns C1 and C2 and the RG sub-pixels are arranged in the third and fourth columns C3 and C4. Therefore, in the second line LINE2, the B subpixels C1 and B, the C subpixels C2 and C, and the R subpixels C3 and R in the order of the column numbers of the first through fourth columns C1 through C4 ), And G subpixels C4 and G are sequentially arranged. Thus, there are B subpixels below R subpixels, C subpixels below G subpixels, R subpixels below B subpixels, and G subpixels below C subpixels.

4, in which the first and second lines LINE1 and LINE2 and the first to fourth columns C1 to C4 are crossed on the pixel array of the display panel having the multi-primary-color subpixel arrangement shown in Fig. 7, The unit subpixel group including the pixels is repeated.

In the multicolor subpixel shown in Fig. 7, the white luminance is 110% at 10000K and 140% at 6500K in terms of the transmittance. This multi-primary subpixel is easy to perform subpixel rendering, can obtain HDR-level peak luminance, and can achieve 12K-level resolution.

8A to 8C are simulation results comparing gamut coverage of a DCI-P3 gamut display device in various images and a multi-color display device having an RGBCWY gamut shown in FIG. The display device of the DCI-P3 gamut selected as the comparative example includes RGB sub-pixels. As can be seen from FIGS. 8A to 8C, in the multicolor display device of the present invention, the gamut coverage is improved compared to the display device of the comparative example, and the color closer to the image of the real environment can be expressed.

FIG. 9A is a graph comparing the color gamut coverage of an image mastered with the color space of BT.2020 when the image No. 4 is displayed on the display device of the comparative example and the multicolor display device of the present invention in FIG. 8A FIG. 9A and 9B, the multicolor display device of the present invention can display an input image with a wider coverage than the comparative example.

The display device of the present invention can be implemented based on a display device such as a liquid crystal display (LCD), a field emission display (FED), and an electroluminescence display device . The electroluminescence display device can be distinguished as an inorganic light emitting display device and an organic light emitting display device depending on the material of the light emitting layer. Each of the pixels of the organic light emitting display includes an organic light emitting diode (OLED) that emits light by itself.

10 is a view showing a display device according to an embodiment of the present invention.

Referring to Fig. 10, the display apparatus of the present invention includes a display panel 100 and a display panel driver.

A screen on which the input image is displayed on the display panel 100 includes a pixel array. The pixel array displays the input image including data lines DL, gate lines (or scan lines, GL) intersecting with the data lines DL, and subpixels arranged in a matrix form. The pixel array has a multi-primary-color subpixel layout structure as shown in Fig. 6 or Fig.

Touch sensors may be disposed on the display panel 100. The touch input may be sensed using separate touch sensors or may be sensed through pixels. The touch sensors may be implemented as in-cell type touch sensors disposed on the screen of a display panel or embedded in a pixel array as an on-cell type or an add-on type .

The display panel driver writes data to the pixels of the display panel 100. The display panel driver includes a data driver 102, a gate driver 104, a timing controller 110, and the like.

The data driver 102 converts the modulated digital video data received from the timing controller 110 into a gamma compensation voltage to generate data voltages and supplies the data voltages to the data lines DL of the display panel 100 . The gate driver 104 supplies a gate pulse to the gate lines GL synchronized with a data voltage supplied to the data lines DL under the control of the timing controller 110 and sequentially shifts the gate pulse.

The timing controller 110 transmits the digital video data of the input image received from the host system 120 to the data driver 102. The timing controller 110 synchronizes the digital video data with the data driver 102 and the gate driver 120 using the timing signals such as the vertical synchronization signal, the horizontal synchronization signal, the data enable signal, and the main clock received from the host system 120. [ (104). The timing controller 110 renders the RGB data of the input image according to the multi-primary color subpixel arrangement structure as shown in FIG. 6 or 7 using a predetermined subpixel algorithm, and transmits the RGB data to the data driving unit 102.

The host system 120 may be any one of a television system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 120 converts the resolution of the input image to a resolution of the display panel 100 using a scaler and transmits the resolution to the timing controller 110 together with the timing signal.

11 is a view showing a color coordinate value in a display device according to an embodiment of the present invention.

Referring to Fig. 11, the display apparatus of the present invention satisfies BT.2020. (x, y), B (x, y) is the color coordinate value of B, and C (x, y) is the color coordinate value of C in the xy color coordinate system, (x, y), the color coordinate value of W is R (x, y), and the color coordinate value of Y is Y (x, y), the color coordinate values of the display device of the present invention are as follows. This color coordinate value is applied equally in the subpixel arrangement shown in Figs.

R (x, y) = R (0.680, 0.320)

G (x, y) = G (0.265, 0.690)

B (x, y) = B (0.150, 0.060)

C (x, y) = C (0.125, 0.333)

W (x, y) = W (0.355, 0.437)

Y (x, y) = Y (0.425, 0.548)

The color coordinates of R, G, and B are substantially the same as the DCI-P3 color coordinates, and W and Y can be shifted in color coordinates for white color temperature adjustment of 10,000K and 6,500K. The color coordinate value of C is set to maximize the coverage of the Pointer's gamut.

On the other hand, when the above color coordinate value is changed to u ', v', the coordinates within the range of the distance within 0.02 centering on the coordinate value fall within the scope of the present invention.

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 invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: display panel 102: data driver
104: Gate driver 110: Timing controller
120: Host system

Claims (5)

A display panel in which data lines and gate lines are intersected and subpixels are arranged in a matrix form,
On the pixel array of the display panel
A first unit subpixel group including a red subpixel, a green subpixel, a blue subpixel, a cyan subpixel, a white subpixel, and a yellow subpixel may be repeated,
The second unit sub-pixel group including the red subpixel, the green subpixel, the blue subpixel, and the cyan subpixel is repeated,
Wherein the color coordinate of the display panel has a light color region satisfying a color coordinate of BT.2020. The method according to claim 1,
The first unit subpixel group includes:
The red subpixel, the green subpixel, the blue subpixel, the cyan subpixel, the white subpixel, the blue subpixel, the blue subpixel, the blue subpixel, and the blue subpixel are sequentially arranged in the first line of the display panel in the order of the column numbers of the first through sixth columns from left to right, And a sub-pixel group of a first line in which the yellow sub-pixels are sequentially arranged,
The red subpixel, the red subpixel, the green subpixel, and the green subpixel in the order of the column numbers of the first through sixth columns in the second line below the first line, A sub-pixel group of a second line in which blue sub-pixels are sequentially arranged,
The green subpixel below the red subpixel, the white subpixel below the green subpixel, the yellow subpixel below the blue subpixel, the red subpixel below the cyan subpixel, And the green subpixel below the white subpixel has a light color region in which the blue subpixel is located below the yellow subpixel. The method according to claim 1,
The second unit subpixel group
Wherein the red subpixel, the green subpixel, the blue subpixel, and the cyan subpixel are sequentially arranged in the order of the column numbers of the first through fourth columns from the left to the right in the first line of the display panel A sub-pixel group of one line,
A second sub-pixel in which the blue sub-pixel, the cyan sub-pixel, the red sub-pixel, and the green sub-pixel are sequentially arranged in the order of the column numbers of the first through fourth columns in the second line below the first line; A subpixel group of lines,
The blue subpixel below the red subpixel, the cyan subpixel below the green subpixel, the red subpixel below the blue subpixel, the green subpixel below the cyan subpixel, Color display device having a light-color area. The method according to claim 1,
Wherein the color coordinate of the display panel has a light color range covering a Pointer's gamut. 5. The method according to any one of claims 1 to 4,
In the xy color coordinate system,
(X, y), a blue color coordinate value of the display panel is B (x, y), a blue color coordinate value of the display panel is a blue color coordinate value of the display panel, a red color coordinate value of the display panel is R (X, y) is a white color coordinate value of the display panel, and Y (x, y) is a yellow color coordinate value of the display panel,
Wherein the color coordinate of the display panel
R (x, y) = R (0.680, 0.320)
G (x, y) = G (0.265, 0.690)
B (x, y) = B (0.150, 0.060)
C (x, y) = C (0.125, 0.333)
W (x, y) = W (0.355, 0.437)
Y (x, y) = Y (0.425, 0.548)
Color display device.

Images