KR20150106622A - Organic light emitting display apparatus - Google Patents

Abstract

An organic light emitting display device comprises pixels arranged in a matrix form. Each of the pixels comprises: a first sub-pixel emitting light of a first color; a second sub-pixel emitting light of a second color; and a third sub-pixel emitting light of a third color. Each of the pixels has a diagonal pixel structure, and wherein the first sub-pixel, the second sub-pixel, and the third pixel are arranged side by side in a diagonal direction. Therefore, high resolution can be effectively realized by applying pixel arrangement of a new structure, and high pixel density as compared with a conventional stripe type can be realized by using a FMM which has same pattern accuracy. Moreover, production costs can be reduced as it is unnecessary to use a more expensive FMM for same resolution.

Description

ORGANIC LIGHT EMITTING DISPLAY APPARATUS [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting display, and more particularly, to a pixel arrangement structure of an organic light emitting display.

An organic light emitting diode (OLED) displays images by using an organic light emitting diode (OLED) that emits light by itself. The organic light emitting diode displays a plurality of pixels using red, green and blue sub pixels, .

The red subpixels, the green subpixels, and the blue subpixels may be arranged in various forms, among which an RGB stripe type array is typical.

1 is a view showing a conventional RGB stripe type sub-pixel arrangement structure.

In the RGB stripe type, each pixel can implement all colors by using red, green, and blue (R, G, B), which are three primary colors of light, in one pixel. As shown in FIG. 1, red, green, and blue sub-pixels 11, 12, and 13 are arranged in a vertical direction in one pixel 10.

The pixels of such a vertical structure are repeatedly arranged in a matrix form to form a screen, and subpixels of the same color are arranged in columns on the screen.

FMM (Fine Metal Mask) technology is mainly used for pixel patterning. This is a technique of forming a pixel on a substrate by depositing a light emitting layer (organic material) of red, green, and blue by placing a metal mask having a small hole on the substrate.

As the resolution of the organic light emitting display increases, microfabrication of the FMM is required to increase the pixel density (ppi). However, there is a limitation in the microfabrication and it is difficult to realize a high resolution. In addition, the higher the pattern accuracy of the FMM, the higher the cost and the precise alignment with the substrate is required, which complicates the process and causes a lot of defective phenomena.

In addition, a white sub-pixel is added to form an RGBW sub-pixel array structure constituting each pixel by four sub-pixels of red, green, blue, and white, and two sub-pixels other than three are arranged in one pixel, A pentagonal sub-pixel array structure for sharing sub-pixels among a plurality of pixels has been proposed.

In the RGBW sub-pixel array structure and the pentagonal sub-pixel array structure, a new driving scheme corresponding to a change in pixel structure (for example, the number of sub-pixels per pixel) must be developed and used. It is necessary to re-design the semiconductor device, which is inefficient in terms of design, manufacture, and cost.

Further, when a new driving method which is not verified is applied to the OLED display device, there are many factors of driving characteristics such as power consumption, driving frequency, and performance, which makes it difficult to realize a stable OLED display device.

KR 10-2014-0020120 A, Publication date: 2014. 02. 18, Name: Pixel array structure and organic electroluminescent display device including the same

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the problems of the related art as described above, and it is an object of the present invention to provide an organic light emitting display device to which a pixel arrangement of a new structure realizing a high resolution is applied.

Another object of the present invention is to improve the pixel arrangement structure of the organic light emitting display device so that high pixel density can be realized compared to the conventional stripe type using FMM having the same pattern accuracy.

Another object of the present invention is to provide an OLED display device having a pixel array structure in which the development of a new driving method or the redesign of a driving device is not required.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not to be construed as limiting the invention as defined by the appended art. It will be possible.

According to an aspect of the present invention, there is provided an organic light emitting diode display comprising pixels arranged in a matrix, each pixel including a first sub-pixel emitting light of a first color; A second sub-pixel that emits light of a second color; And a third sub-pixel that emits light of a third color, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are arranged in a diagonal direction in each pixel.

Each pixel includes a first sub-pixel arranged symmetrically with respect to a diagonal line and arranged diagonally along a diagonal line; A second sub-pixel disposed on one side of the diagonal line; And a third sub-pixel disposed on the other side of the diagonal line and facing the second sub-pixel with the first sub-pixel interposed therebetween.

Two adjacent pixels can be symmetrical with respect to the center line between two pixels.

In a pixel group including four pixels adjacent to each other in the up, down, left, and right directions, the pixels of the pixel group may be arranged symmetrically with respect to the center horizontal line and symmetrically with respect to the central vertical line.

In the pixel group, four sub-pixels of the same color belonging to different pixels can be arranged adjacent to each other based on the center by the mirror structure that is symmetrical in the up, down, left, and right directions.

Each of the pixels includes a red sub-pixel, a green sub-pixel and a blue sub-pixel as first to third sub-pixels, and the area ratio of each sub-pixel may be set according to a target value of a color coordinate.

In each of the pixels, the first sub-pixel may have a larger area than the second sub-pixel and the third sub-pixel.

In each of the pixels, the first sub-pixel may be set to the sub-pixel having the lowest one of the luminance, luminous efficiency, and color purity among the red sub-pixel, the green sub-pixel, and the blue sub-pixel.

In each of the pixels, the first subpixel may be set as a subpixel having the shortest lifetime among red subpixels, green subpixels, and blue subpixels.

In each of the pixels, the first sub-pixel may be a blue sub-pixel, the second sub-pixel may be one of red and green sub-pixels, and the third sub-pixel may be another one of red and green sub-pixels.

Each pixel may be in the form of a square.

In each of the pixels, the first sub-pixel may have a shape in which long axes are aligned along a diagonal line, and may be in the form of a figure selected from the group consisting of a hexagon, a rectangle, and an ellipse.

In each of the pixels, the second sub-pixel and the third sub-pixel are opposed to each other with the first sub-pixel interposed therebetween, and each of the second sub-pixel and the third sub-pixel has a shape selected from the group consisting of a rectangle, an ellipse, It may be in the shape of a figure.

According to the organic light emitting diode display of the present invention, high resolution can be effectively realized by applying a pixel arrangement of a new structure.

Further, according to the organic light emitting diode display of the present invention, high pixel density can be realized compared with the conventional stripe type using FMM having the same pattern accuracy.

In addition, according to the organic light emitting diode display of the present invention, it is not necessary to use a more expensive FMM for the same resolution, and the cost can be reduced.

Further, according to the organic light emitting diode display of the present invention, it is possible to easily obtain the driving characteristics without changing the driving method or performing additional signal processing through the pixel array structure to which the known driving method can be applied. It is unnecessary to redesign the driving element, which is effective in terms of design, manufacture, and cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional RGB stripe type sub-pixel arrangement structure. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting display.
3 is a diagram illustrating a pixel arrangement structure of an organic light emitting display according to an embodiment of the present invention.
4 is a diagram illustrating a sub-pixel arrangement structure of an organic light emitting display according to another embodiment of the present invention.

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

2 is a diagram illustrating a sub-pixel arrangement structure of an OLED display according to an embodiment of the present invention.

The organic light emitting diode display according to an embodiment of the present invention has a pixel structure of a diagonal shape, not a vertical (or horizontal) shape, as shown in FIG.

Each pixel 100 includes a first sub-pixel 110 for emitting light of a first color, a second sub-pixel 110 for emitting light of a second color, Pixel 120 and a third sub-pixel 130 that emits light of a third color.

2, each of the first sub-pixel 110, the second sub-pixel 120, and the third sub-pixel 130 includes a blue sub-pixel B, a red sub-pixel R, (G). ≪ / RTI >

In one embodiment, the pixel 100 has a square planar shape. The sub-pixels 11, 120, and 130 are configured in a diagonal direction, that is, an oblique direction of +/- 45 degrees.

The first sub-pixel 110, the second sub-pixel 120, and the third sub-pixel 130 are arranged in parallel in the oblique direction to form one pixel 100.

The first sub-pixel 110 is arranged in a diagonal direction along a diagonal line 140 of the pixel 100. [ The second sub-pixel 120 is disposed on one side (e.g., the lower left side) of the diagonal line 140. [ The third subpixel 130 includes a second subpixel 120 and a second subpixel 120 disposed on the other side (e.g., the upper right side) of the diagonal line 140 with the first subpixel 110 aligned along the diagonal line 140 therebetween. I face each other.

The pixels 100 thus configured are symmetrical with respect to the diagonal line 140.

In the embodiment of FIG. 2, the first subpixel 110 is formed in the shape of a long hexagon whose major axes are aligned along the diagonal 140 of the pixel 100. The major axis length of the first sub-pixel 110 is formed larger than the width.

The area ratios and hues of the sub-pixels 110, 120, and 130 constituting one pixel 100 can be changed and set in accordance with the electro-optical characteristics (brightness, luminous efficiency, color purity, etc.) of the light emitting layer.

As shown in FIG. 2, when the first sub-pixel 110 is formed to have a wider area than the second sub-pixel 120 and the third sub-pixel 130, the red sub- It is effective to set the sub-pixel having the lowest one of the luminance, luminous efficiency, or color purity among the pixels to the first sub-pixel 110. [

For example, if the blue subpixel among the red, green, and blue subpixels has the weakest light emitting efficiency, the first subpixel 110 may be set as a blue subpixel and the second subpixel 110 may be relatively Wide. In this case, the first sub-pixel 110 is set to a blue sub-pixel, the second sub-pixel 120 is set to one of red and green sub-pixels, the third sub-pixel 130 is set to one of red and green sub- And is set to the other one.

In addition, the area ratio and hue of the sub-pixels 110, 120, and 130 may be set according to the lifetime characteristics of the light emitting layer.

In general, the blue subpixel among the red, green, and blue subpixels has the shortest lifetime. Therefore, in one embodiment, by setting the first sub-pixel 110 having the widest area as the blue sub-pixel, it is possible to improve lifetime characteristics of the organic light emitting display as a whole.

The array structure shown in FIG. 2 can be applied to an organic light emitting display in which red, green, and blue sub-pixels are included for each pixel to implement a full color. Passive matrix and active matrix driving methods .

As in the embodiment of the present invention, when three sub-pixels 110 to 130 constituting one pixel 100 are composed of red, green and blue sub-pixels, The driving method of the organic light emitting display device applied to the OLED display device can be used as it is.

That is, the diagonal type pixel structure according to an embodiment of the present invention can adopt a known driving method of the conventional RGB stripe type, and can easily obtain the driving characteristic without changing the driving method or performing additional signal processing, There is no need to develop a new driving method or redesign of a driving element, which is advantageous in terms of design, manufacture, and cost.

3 is a diagram illustrating a pixel arrangement structure of an organic light emitting display according to an exemplary embodiment of the present invention.

Each pixel (for example, 101 or 102) includes three sub-pixels R, G, and B that emit different colors by employing the sub-pixel arrangement structure of FIG. The subpixels R, G and B are arranged in a diagonal direction side by side in a pixel (for example, 101 or 102) and have a shape inclined by 45 or -45 degrees.

The pixels constituted in this manner are arranged as a minimum unit of a screen, and a plurality of pixels are repeatedly arranged according to a predetermined pattern to constitute a screen of the organic light emitting display device.

In one embodiment, the pixels having a diagonal-shaped structure are arranged in a matrix in rows and columns as shown in Fig.

Adjacent pixels are formed in the form of a mirror facing each other.

In the pixel arrangement of the mirror structure, two pixels (for example, 101 and 103, or 101 and 102) arranged vertically or horizontally adjacent to each other are symmetrical with respect to the center line between two pixels.

Further, four pixels (for example, 101 to 104) adjacent to each other in the up, down, left, and right directions form one pixel group (for example, 210). The pixels of one pixel group are symmetrically arranged with respect to a horizontal line passing through the center point of the pixel group and are arranged so as to be symmetrical with respect to a vertical line passing through the center point, thereby forming a mirror structure symmetrical up and down and left and right.

If such an upper, lower, left, and right mirror structure is employed, four sub-pixels of the same color, for example, green sub-pixels G belonging to different pixels (for example, 101 to 104) Are gathered to be adjacent to each other. In one embodiment, each of the four neighboring sub-pixels is formed by equally dividing one figure (e.g., a rectangle) into 1/4 pieces, and these are adjacent to each other based on the center point to complete one figure shape.

If the subpixels of the same color are disposed adjacent to the center point, these light emitting layers can be deposited at one time through one hole of the FMM.

For example, in FIG. 3, four green sub-pixels G belonging to each of four adjacent pixels 101 to 104 constituting the first pixel group 210 are adjacent to each other based on a center point. A red sub-pixel R is arranged on the diagonally opposite side of each of the pixels 101 to 104. Accordingly, in the second pixel group 220, the red sub-pixels R of the adjacent pixels 104 to 107 are adjacent to each other based on the center point.

As described above, the adjacent light-emitting layers of the same color can be formed at the same time by depositing the same light-emitting layer in one region, thereby simplifying the FMM deposition process and reducing the process cost.

As in the embodiment, when a diagonal pixel structure is employed and a pixel array of a symmetric structure is applied, higher resolution can be designed compared to the conventional stripe type even if FMM having the same pattern accuracy is used.

The effect of achieving such a high resolution as compared with the conventional stripe type will be described in more detail as follows.

In the FMM, holes are formed only in a portion where the light-emitting layer passes according to the sub-pixel arrangement pattern, and a light-emitting layer is deposited through the holes to form a sub-pixel.

The FMM used in deposition of the light emitting layer emitting each color is fabricated in the same direction as the sub-pixel array pattern. In one embodiment, since the FMM is designed according to the diagonal pixel structure, the holes of the FMM are configured diagonally rather than vertically.

'이다. 화소밀도는 256.6ppi이다.For example, in the conventional stripe-type pixel structure shown in FIG. 1, if the minimum size of one pixel is 99 μm × 99 μm, the minimum hole width of the FMM is 33 μm. Since the vertical and horizontal lengths of the pixels are 99 mu m, the diagonal length is "

'to be. The pixel density is 256.6 ppi.

In contrast, when a diagonal pixel structure is applied as in the embodiment of the present invention, when the minimum hole width of the FMM is processed to 33 μm, the sub-pixels are formed diagonally, Pixels can be constructed.

'이다. 화소밀도는 362ppi로 종래 스트라이프형 화소 구조의 화소밀도에 비해 41% 향상시킬 수 있다.When the diagonal length of the pixel is 99 mu m, the vertical and horizontal lengths of the pixel are denoted by AL, and AL is denoted by trigonometric function and Pythagorean method,

'to be. The pixel density is 362 ppi, which is 41% higher than the pixel density of the conventional stripe type pixel structure.

'만큼 더 작게 구성할 수 있다.In other words, when comparing the diagonal pixel structure shown in FIG. 2 with the conventional vertical pixel structure shown in FIG. 1, the vertical and horizontal lengths (VL) and the diagonal lengths DL of diagonal pixels Respectively. The pixel size of FIG. 2 is smaller than the pixel size VL of FIG.

As shown in FIG.

Therefore, when the same pixel size as the conventional vertical pixel structure is designed by applying the diagonal pixel structure, the same resolution can be achieved even when the size of the FMM hole is designed and manufactured to be larger. FMM with lower pattern accuracy can realize the same resolution as the conventional stripe type. In addition, higher resolution can be designed compared to the conventional stripe type using FMM having the same pattern accuracy.

The area ratio of sub-pixels of red, green, and blue sub-pixels may be set according to a target value of a color coordinate. For example, if the target color coordinate of white is (x = 0.31, y = 0.33), the red subpixel R is 20% of the pixel area and the blue subpixel B is 40% , And the green sub-pixel G is set at a ratio of 40% of the pixel area.

The target value of the color coordinates can be varied according to the specifications and specifications of the organic light emitting display device, and thus the area ratio of the red, green, and blue sub-pixels can be varied.

4 is a diagram illustrating a sub-pixel arrangement structure of an organic light emitting diode display according to another embodiment of the present invention, wherein (a) to (f) illustrate various modified forms of the diagonal pixel structure of FIG. 2 .

Each pixel is in the form of a square and includes three sub-pixels which emit different colors and are arranged side by side in a diagonal direction.

The first sub-pixel in the center may have a shape of a hexagon, a rectangle, an ellipse, or the like in which the long axes thereof are aligned along the diagonal lines of the pixels.

(b), (d), and (e) illustrate a structure in which the first sub-pixel is a long rectangular shape, and FIGS. do.

The second and third sub-pixels located on both sides of the diagonal line of each pixel face each other with the first sub-pixel therebetween, and may have a shape of a figure such as a rectangle, an ellipse, a right triangle, or a fan.

In the case of (c) and (d), the second subpixel and the third subpixel are in the shape of a right triangle. In the two right triangles, the hypotenuse portions face each other and the vertexes opposite the hypotenuse are arranged to face the corner of the pixel have.

(e) and (f), the second subpixel and the third subpixel are arranged in a shape of a sector having an interior angle of 90 ° and arc portions facing each other.

The configuration of the organic light emitting diode display according to the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

100: pixel
110: 1st sub-pixel
120: Second sub-pixel
130: Third sub-pixel
210: a first pixel group
220: second pixel group

Claims (13)

Comprising pixels arranged in a matrix form,
Each pixel including a first sub-pixel emitting light of a first color; A second sub-pixel that emits light of a second color; And a third sub-pixel that emits light of a third color,
Wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are arranged in parallel in the oblique direction in each pixel. The method according to claim 1,
Each of the pixels includes:
It is symmetrical with respect to the diagonal line.
A first sub-pixel arranged diagonally along a diagonal line;
A second sub-pixel disposed on one side of the diagonal line;
And a third sub-pixel disposed on the other side of the diagonal line and facing the second sub-pixel with the first sub-pixel interposed therebetween. The method according to claim 1,
Wherein two adjacent pixels are symmetrical with respect to a center line between two pixels. The method according to claim 1,
In a pixel group including four pixels adjacent in the up, down, left, and right directions,
Wherein the pixels of the pixel group are arranged symmetrically with respect to a center horizontal line and symmetrically with respect to a center vertical line to form a mirror structure. 5. The method of claim 4,
In the pixel group,
And four sub-pixels of the same color belonging to different pixels are adjacently gathered on the basis of the center by the mirror structure that is symmetrical in the up, down, left, and right directions. The method according to claim 1,
Each of the pixels includes:
Pixel, a green sub-pixel, and a blue sub-pixel as first to third sub-pixels, and the area ratio of each sub-pixel is set according to a target value of a color coordinate. 3. The method of claim 2,
In each of the pixels,
And the first sub-pixel has a larger area than the second sub-pixel and the third sub-pixel. 8. The method of claim 7,
In each of the pixels,
Wherein the first sub-pixel is set to a sub-pixel having a lowest one of a luminance, a luminous efficiency, and a color purity among red sub-pixels, green sub-pixels, and blue sub-pixels. 8. The method of claim 7,
In each of the pixels,
Wherein the first sub-pixel is set as a sub-pixel having the shortest lifetime among the red sub-pixel, the green sub-pixel, and the blue sub-pixel. 8. The method of claim 7,
In each of the pixels,
The first sub-pixel is a blue sub-pixel,
Wherein the second sub-pixel is one of red and green sub-pixels,
And the third sub-pixel is another one of the red and green sub-pixels. 3. The method of claim 2,
Wherein each of the pixels is in the form of a square. 12. The method of claim 11,
In each of the pixels,
Wherein the first sub-pixel is a shape in which major axes are aligned along a diagonal line, and is in a shape of any one of a hexagon, a rectangle, and an ellipse. 13. The method of claim 12,
In each of the pixels,
The second subpixel and the third subpixel are opposed to each other with the first subpixel therebetween, and each of the first subpixel and the second subpixel has an organic light emitting structure, which is a shape of a figure selected from the group consisting of a rectangle, an ellipse, Display device.

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