Pixel array structure of organic light-emitting display device

Abstract

To provide a pixel array structure of an organic light-emitting display device, in which the opening ratio of pixels is improved and the gap between the pixels is set efficiently.SOLUTION: In a pixel array structure, a plurality of first pixels are arranged along a direction of a first axis (second axis that is perpendicular to the first axis) to form a plurality of first pixel rows (first pixel columns), second pixels and third pixels are arranged alternately along a direction of the first axis (second axis) parallel to the first pixel rows (first pixel columns) to form a plurality of second pixels and a third pixel row (second pixel and third pixel column), the first pixel rows (first pixel columns) and the second pixels and the third pixel row (second pixels and third pixel column) are disposed alternately, between the two first pixel columns each including two first pixels adjacent along the direction of the first axis, just one second pixel and one third pixel row are disposed, and the first pixel has a smaller area than the second pixel and the third pixel.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pixel array structure of an organic light emitting display device, and more particularly, to a pixel array structure of an organic light emitting display device in which a plurality of pixels emit light to display an image. [Background technology]

[0002] A display device is a device that displays an image, and organic light emitting diode displays have been attracting attention recently. OLEDs have self-emitting properties and do not require a separate light source, unlike liquid crystal display devices, so they can be made thinner and lighter. In addition, OLEDs have high-quality properties such as low power consumption, high brightness, and fast response speed.

[0003] In general, an organic light emitting display device includes a plurality of pixels each emitting light of a different color, and the pixels emit light to display an image. Here, a pixel refers to the smallest unit for displaying an image, and between adjacent pixels, power lines such as gate lines, data lines, and driving power lines for driving each pixel, and insulating layers such as a pixel definition film for defining the area or shape of each pixel may be arranged.

[0004] The organic light-emitting layer constituting the pixels of conventional organic light-emitting display devices is formed by deposition using a mask such as a fine metal mask (FMM). However, when the gap between adjacent pixels is made short to ensure the aperture ratio of the pixels, there is a problem of reduced deposition reliability, and when the gap between pixels is made farther to improve the deposition reliability, there is a problem of reduced pixel aperture ratio. Summary of the Invention [Problem to be solved by the invention]

[0005] One embodiment of the present invention has been made in consideration of the above problems, and an object of the present invention is to provide a pixel arrangement structure of an organic light-emitting display device in which the aperture ratio of the pixel is improved while the gap between the pixels is efficiently set. [Means for solving the problem]

[0006] In order to achieve the above technical objective, one aspect of the present invention provides a pixel array structure of an organic light emitting display device, the pixel array structure including: a first pixel; a second pixel spaced apart from the first pixel and having a center point at a first vertex of an imaginary square having a center point at a center point of the first pixel; and a third pixel spaced apart from the second pixel and having a center point at a second vertex adjacent to the first vertex of the imaginary square, wherein each of the first pixel, the second pixel, and the third pixel has a polygonal shape.

[0007] The second pixels may be a plurality of pixels, and the plurality of second pixels may be spaced apart from each other with the first pixels interposed therebetween. The third pixels may be a plurality of pixels, and the plurality of third pixels may be spaced apart from each other with the first pixels interposed therebetween. The number of the second pixels is multiple, the number of the third pixels is multiple, and each of the multiple second pixels and the multiple third pixels can surround the first pixel on the virtual regular square.

[0008] The second pixel and the third pixel may have a larger area than the first pixel. The first pixel may have an octagonal shape, and at least one of the second pixel and the third pixel may have an octagonal shape. The first pixel may have an octagonal shape, one of the second pixel and the third pixel may have a hexagonal shape, and the other may have a quadrangular shape.

[0009] The first pixels may be a plurality of pixels, and adjacent first pixels among the plurality of first pixels may have octagonal shapes symmetrical to each other. The second pixel may have a larger area than the third pixel. The distance between the first pixel and the second pixel, and the distance between the first pixel and the third pixel may each have the same first length.

[0010] A distance between the second pixel and the third pixel may have a second length, and a distance between adjacent first pixels may have a third length that is longer than each of the first length and the second length. The first pixel, the second pixel, and the third pixel can emit light of different colors.

[0011] The first pixel may emit green light, one of the second pixel and the third pixel may emit blue light, and the other may emit red light. Effect of the Invention

[0012] According to any one of the embodiments of the solutions of the present invention described above, a pixel arrangement structure of an organic light emitting display device is provided in which the aperture ratio of a pixel is improved and the gap between pixels is efficiently set. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating a pixel arrangement structure of an organic light emitting display device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention may, however, be embodied in various different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts that are not necessary for the explanation are omitted, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0015] Furthermore, in the drawings, the size and thickness of each component are arbitrarily shown for convenience of explanation, and the present invention is not necessarily limited to those shown. Furthermore, throughout the specification, when a part is said to "comprise" a certain component, this does not mean to exclude other components, but means that it may further include other components, unless specifically stated to the contrary.

[0016] Hereinafter, a pixel arrangement structure of an organic light emitting display according to an embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a schematic diagram illustrating a portion of a pixel constituting an organic light emitting display. FIG. 1 is a diagram showing a pixel arrangement structure of an organic light emitting display device according to an embodiment of the present invention.

[0017] As shown in FIG. 1, a pixel array structure of an organic light emitting display device according to an embodiment of the present invention includes a plurality of first pixels 100, a plurality of second pixels 200, and a plurality of third pixels 300. Here, a pixel means the smallest unit for displaying an image. Power lines such as gate lines, data lines, and driving power lines for driving each pixel, and insulating layers such as a pixel defining film for defining each pixel may be disposed between the first pixel 100, the second pixel 200, and the third pixel 300, and organic light emitting diodes including an anode electrode, an organic light emitting layer, and a cathode electrode may be disposed corresponding to each of the first pixel 100, the second pixel 200, and the third pixel 300. Since these configurations are well known in the art, they will not be described for the sake of convenience, and the shape of each pixel is defined by a plurality of power lines, a pixel defining film, or an anode electrode, but is not limited thereto.

[0018] The first pixel 100 has a smaller area than the adjacent second pixel 200 and third pixel, and has a polygonal shape. The first pixel 100 has an octagonal shape among polygonal shapes, but is not limited thereto, and may have a polygonal shape such as a triangle, a rectangle, a pentagon, a hexagon, or a heptagon. There are a plurality of first pixels 100, and adjacent first pixels 100 among the plurality of first pixels 100 have symmetrical octagonal shapes. Meanwhile, each of the plurality of first pixels 100 may have the same octagonal shape. Each of the plurality of first pixels 100 is spaced apart from each other and arranged on a virtual first straight line VL1. The first pixel 100 may emit green light and may include an organic light emitting layer emitting green light. Meanwhile, the first pixel 100 may include an organic light emitting layer emitting various colors of light such as blue, red, or white, and may emit blue, red, or white light.

[0019] The second pixel 200 is located at a first vertex P1 of an imaginary regular rectangle VS whose center point is the center point of the first pixel 100, and the third pixel 300 is located at a second vertex P2 of the imaginary regular rectangle VS. The second pixel 200 is spaced apart from the first pixel 100, and has a center point at a first vertex P1 of a virtual regular square VS. The second pixel 200 has a larger area than the adjacent first pixel 100 and third pixel 300, and has a hexagonal shape among polygonal shapes. Meanwhile, the second pixel 200 may have a polygonal shape such as a triangle, a square, a pentagon, a heptagon, or an octagon. There are a plurality of second pixels 200, and each of the plurality of second pixels 200 has the same hexagonal shape. The plurality of second pixels 200 are spaced apart from each other with the first pixel 100 interposed therebetween. The second pixel 200 may include an organic light emitting layer that emits blue light. Meanwhile, the second pixel 200 may include an organic light emitting layer that emits various colors of light such as red, green, or white, and may emit red, green, or white light.

[0020] The third pixel 300 is separated from the first pixel 100 and the second pixel 200, and has a center point located at a second vertex P2 adjacent to a first vertex P1 of a virtual regular square VS. The third pixel 300 has a larger area than the adjacent first pixel 100, and at the same time, has a smaller area than the adjacent second pixel 200. The third pixel 300 has a quadrangle shape among polygonal shapes. Meanwhile, the third pixel 300 may have a polygonal shape such as a triangle, a pentagon, a hexagon, a heptagon, or an octagon. There are a plurality of third pixels 300, and each of the plurality of third pixels 300 has the same quadrangle shape. The plurality of third pixels 300 are separated from each other with the first pixel 100 interposed therebetween. The third pixel 300 emits red light and may include an organic light-emitting layer that emits red light. Meanwhile, the third pixel 300 includes an organic light emitting layer that emits light of various colors such as blue, green, or white, and can emit blue, green, or white light.

[0021] Meanwhile, the second pixel 200 and the third pixel 300 have a hexagonal shape and a square shape, respectively, but the second pixel 200 and the third pixel 300 may have a square shape and a hexagonal shape, respectively. That is, one of the second pixel 200 and the third pixel 300 may have a hexagonal shape and the other may have a square shape.

[0022] Also, the first pixel 100, the second pixel 200, and the third pixel 300 emit light of green, blue, and red, respectively, and the first pixel 100, the second pixel 200, and the third pixel 300 may emit light of different colors or may emit light of the same color. Specifically, the first pixel 100 may emit green light, one of the second pixel 200 and the third pixel 300 may emit blue light, and the other may emit red light.

[0023] The multiple third pixels 300 and the multiple second pixels 200 are arranged alternately with each other on a virtual second straight line VL2, whereby the multiple second pixels 200 whose center points are located at the first vertex P1 and the multiple third pixels 300 whose center points are located at the second vertex P2 surround the first pixel 100 on a virtual regular rectangle VS.

[0024] In this way, the center point of the second pixel 200 is located at the first vertex P1 of the imaginary regular quadrangle VS having the center point of the first pixel 100 as the center point of the regular quadrangle, and the center point of the third pixel 300 is located at the second vertex P2. As a result, the multiple second pixels 200 whose center points are located at the first vertex P1 and the multiple third pixels 300 whose center points are located at the second vertex P2 each surround the first pixel 100 on the imaginary regular quadrangle VS. , and the third pixel 300 have a polygonal shape, the distance between the first pixel 100 and the second pixel 200 and the distance between the first pixel 100 and the third pixel 300 each have the same first length L1, the distance between adjacent second pixels 200 and third pixels 300 has a second length L2 different from the first length L1, and the distance between adjacent first pixels 100 has a third length L3 longer than the first length L1 and the second length L2.

[0025] As an example, the first length L1 may be between 15 um and 35 um, the second length L2 may be between 20 um and 45 um, and the third length L3 may be between 25 um and 65 um.

[0026] As a result, a gap of a first length L1 is formed between the first pixel 100 and the second pixel 200 and between the first pixel 100 and the third pixel 300, respectively, and at the same time, a gap of a third length L3 longer than the first length L1 is formed between adjacent first pixels 100. This improves deposition reliability during a deposition process using fine metal masks to form the green organic light-emitting layer, the blue organic light-emitting layer, and the red organic light-emitting layer included in the first pixel 100, the second pixel 200, and the third pixel 300, respectively.

[0027] In addition, since the plurality of second pixels 200 and the plurality of third pixels 300 are arranged to surround the first pixel 100 on the virtual square VS, it is possible to improve the aperture ratio of each of the first pixel 100, the second pixel 200, and the third pixel 300. This reduces the overall manufacturing time and cost of the OLED display device, and at the same time, acts as a factor in improving the quality of an image displayed by the OLED display device.

[0028] Furthermore, in the pixel arrangement structure of the organic light emitting display according to an embodiment of the present invention, the second pixel 200, which emits blue light and has a shorter lifetime than the other pixels among the first pixel 100, the second pixel 200, and the third pixel 300, has a larger area than the first pixel 100 and the third pixel 300, respectively, thereby suppressing a decrease in the lifetime of the organic light emitting display as a whole. In other words, a pixel arrangement structure of an organic light emitting display with improved lifetime is provided.

[0029] As described above, in the pixel arrangement structure of the organic light emitting display device according to an embodiment of the present invention, the first pixel 100, the second pixel 200, and the third pixel 300 do not simply have polygonal shapes such as an octagon, a hexagon, and a rectangle, respectively. Instead, in consideration of the deposition process of the organic light emitting layer, which is a unique manufacturing characteristic of the organic light emitting display device, the center point of the first pixel 100 is located at the center point of the imaginary regular rectangle VS, the center point of the second pixel 200 is located at the first vertex P1, and the center point of the third pixel 300 is located at the second vertex P2 in order to improve the deposition reliability of the organic light emitting layer during the deposition process using a fine metal mask and at the same time improve the aperture ratio of each of the first pixel 100, the second pixel 200, and the third pixel 300.

[0030] In other words, a pixel arrangement structure of an organic light emitting display device including an octagonal first pixel 100, a hexagonal second pixel 200, and a rectangular third pixel 300 is provided, which improves the deposition reliability of the organic light emitting layer while improving the aperture ratio of each of the first pixel 100, the second pixel 200, and the third pixel 300.

[0031] Although the present invention has been described above through the preferred embodiments, it will be easily understood by those skilled in the art to which the present invention pertains that the present invention is not limited thereto, and various modifications and variations are possible without departing from the concept and scope of the claims set forth below. [Explanation of symbols]

[0032] 100 1st pixel 200 2nd pixel 300 3rd pixel

Claims

[Claim 1] A pixel array structure of an organic light emitting display device including a plurality of first pixels, a plurality of second pixels, and a plurality of third pixels, the first pixel, the second pixel, and the third pixel emit light of different colors; the first pixels are arranged along a first axis to form a plurality of first pixel rows, the second pixels and the third pixels are arranged alternately along the first axis to form a plurality of second pixel rows and a plurality of third pixel rows, the first pixel rows and the second pixel rows and the third pixel rows are arranged alternately, the first pixels are arranged along a direction of a second axis perpendicular to the first axis to form a plurality of first pixel columns, the second pixels and the third pixels are alternately arranged along a direction of the second axis parallel to the first pixel columns to form a plurality of second pixel columns and a third pixel column, the first pixel columns and the second pixel columns and the third pixel columns are alternately arranged, only one of the second pixel and third pixel columns is disposed between two of the first pixel columns each including two first pixels adjacent to each other along the first axis direction, The first pixels, the second pixels, and the third pixels are each a minimum unit for displaying an image, and the first pixels have an area smaller than the second pixels and the third pixels; a shortest distance between the first pixel and the second pixel and a shortest distance between the first pixel and the third pixel each have the same first length L1; a shortest distance between the second pixel and the third pixel has a second length L2 different from the first length L1; A pixel array structure of an organic light emitting display device, wherein the shortest distance between adjacent first pixels has a third length L3 that is longer than each of the first length L1 and the second length L2.

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