EP-4742872-A2 - ORGANIC LIGHT EMITTING DISPLAY DEVICE

EP4742872A2EP 4742872 A2EP4742872 A2EP 4742872A2EP-4742872-A2

Abstract

Discussed is an organic light emitting display device including a plurality of pixels, where red sub pixels and blue sub pixels of adjacent pixels are aligned in a first direction and are also aligned in a second direction, the second direction being a direction that intersects the first direction. Also, the green pixels of adjacent pixels are aligned in the first direction and are also aligned in the second direction. And the at least one green sub pixel of each pixel is disposed between the at least one red sub pixel and the at least one blue sub pixel of the each pixel, and the at least one green sub pixel is offset from the at least one red sub pixel and the at least one blue sub pixel in the first direction and the second direction in the each pixel.

Inventors

CHUNG, EUIHYUN
JEONG, Yongmin

Assignees

LG Display Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20170309

Claims (15)

An organic light emitting display device, comprising: a plurality of pixels including a first pixel and a second pixel, each of the first pixel and the second pixel including at least one red sub pixel (SR), a plurality of green sub pixels (SG1, SG2) and at least one blue sub pixel (SB); wherein in each of the first pixel and the second pixel, the plurality of green sub pixels (SG1, SG2) is disposed on a first line (l 1 ) extended in a first direction (X); wherein in each of the first pixel and the second pixel, the red sub pixel (SR) and the blue sub pixel (SB) are disposed on different sides with respect to the first line (l 1 ); wherein in each of the first pixel and the second pixel, the red sub pixel (SR) and the blue sub pixel (SB) are disposed on a second line (l 2 ) parallel to a second direction (Y) perpendicular to the first direction (X); wherein in each of the first pixel and the second pixel, the plurality of green sub pixels (SG1, SG2) are configured smaller than each of the at least one red sub pixel (SR) and the at least one blue sub pixel (SB); and wherein in each of the first pixel and the second pixel, the plurality of green sub pixels (SG1, SG2) includes a first green sub pixel (SG1) having a first organic light emitting diode (130a) and a first thin film transistor (120a) and a second green sub pixel (SG2) having a second organic light emitting diode (130b) and a second thin film transistor (120b).
The organic light emitting display device according to claim 1, wherein the first pixel and the second pixel are adjacent to each other in the second direction (Y) and symmetric to each other with a symmetry axis in the first direction (X).
The organic light emitting display device according to claim 1 or 2, wherein in each of the first pixel and the second pixel, a first source electrode (124) of the first thin film transistor (120a) of the first green sub pixel (SG1) and a second source electrode (127) of the second thin film transistor (120b) of the second green sub pixel (SG2) are connected to the same data line and thus to each other; and/or wherein the plurality of green sub pixels (SG1, SG") is commonly connected to one data line.
The organic light emitting display device according to any one of the preceding claims, wherein in each of the first pixel and the second pixel, an organic emission layer of the first organic light emitting diode (130a) of the first green sub pixel (SG1) and an organic emission layer of the second organic light emitting diode (130b) of the second green sub pixel (SG2) are formed as a common structure and are connected to each other.
The organic light emitting display device according to any one of the preceding claims, wherein the first thin film transistor (120a) of the first green sub pixel (SG1) and/or the second thin film transistor (120b) of the second green sub pixel (SG2) is a driving thin film transistor or a switching thin film transistor.
The organic light emitting display device according to any one of the preceding claims, wherein an active layer (121, 125) of the first thin film transistor (120a) of the first green sub pixel (SG1) and/or of the second thin film transistor (120b) of the second green sub pixel (SG2) is formed of an amorphous silicon, a polycrystalline silicone, an oxide semiconductor or an organic semiconductor.
The organic light emitting display device according to any one of the preceding claims, wherein in a plurality of pixels disposed in the first direction (X), the red sub pixels (SR) and the blue sub pixels (SB) are alternately disposed on a third line (l 3 ) parallel to the first line (l 1 ) extended in the first direction (X).
The organic light emitting display device according to any one of the preceding claims, wherein a distance (d2, d3, d4) between sub pixels emitting different colors is greater than a distance (d1, d5) between sub pixels emitting the same color.
The organic light emitting display device according to any one of the preceding claims, wherein in each of the first pixel and the second pixel, a distance (d2) between the blue sub pixel (SB) and the plurality of green sub pixels (SG1, SG2), a distance (d3) between the red sub pixel (SR) and the plurality of green sub pixels (SG1, SG2), and a distance (d4) between the red sub pixel (SR) and the blue sub pixel (SB) are greater than a distance (d1) between the green sub pixels (SG1, SG2).
The organic light emitting display device according to any one of the preceding claims, wherein a distance (d2) between the blue sub pixel (SB) and the plurality of green sub pixels (SG1, SG2), a distance (d3) between the red sub pixel (SR) and the plurality of green sub pixels (SG1, SG2), and a distance (d4) between the red sub pixel (SR) and the blue sub pixel (SB) among the plurality of sub pixels are greater than a distance (d5) between red sub pixels (SR) or blue sub pixels (SB) disposed adjacent to each other in pixels adjacent in the second direction.
The organic light emitting display device according to any one of the preceding claims, wherein in each of the first pixel and the second pixel, a distance (d2) between the blue sub pixel (SB) and the plurality of green sub pixels (SG1, SG2) is equal to a distance (d3) between the red sub pixel (SR) and the plurality of green sub pixels (SG1, SG2).
The organic light emitting display device according to any one of the preceding claims, wherein in each of the first pixel and the second pixel, the plurality of the green sub pixels (SG1, SG2) is disposed symmetric to each other with respect to a fourth line (l 4 ) parallel to the second line (l 2 ) extended in the second direction (Y).
The organic light emitting display device of claim 11, wherein in a plurality of pixels disposed in the second direction (Y), the plurality of green sub pixels (SG1, SG2) is disposed symmetric to each other with respect to the fourth line (l 4 ).
The organic light emitting display device according to any one of the preceding claims, wherein the first pixel and the second pixel are alternately arranged in the first direction (X) and/or in the second direction (Y).
The organic light emitting display device according to any one of the preceding claims, wherein in each of the first pixel and the second pixel, a whole area of the plurality of green sub pixels (SG1, SG2) is smaller than an area of each of the red sub pixel (SR) and of the blue sub pixel (SB); and/or wherein in each of the first pixel and the second pixel, the at least one red sub pixel (SR) and the at least one blue sub pixel (SB) disposed on the second line (l 2 ) are commonly connected to the same data line that is the second line (l 2 ).

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of Korean Patent Application No. 10-2016-0053491 filed on April 29, 2016, in the Korean Intellectual Property Office. BACKGROUND OF THE INVENTION Field of the Invention The present disclosure relates to an organic light emitting display device, and more particularly, to an organic light emitting display device having an improved life span. Description of the Related Art Recently, as society advances to the information society, the field of display devices which visually express electrical information signals is rapidly advancing. Thus, various display devices with performance, such as thinness, lightness, and low power consumption have been developed. Specific examples of the display devices include a Liquid Crystal Display (LCD) device, a Plasma Display Panel (PDP) device, a Field Emission Display (FED) device, an Organic Light Emitting Display (OLED) device, and the like. Particularly, the OLED device is a self-emitting device and has advantages such as a high response time, a high luminous efficiency, a high brightness, and a wide viewing angle as compared with the other display devices. Therefore, the OLED device is attracting much attention. Further, an organic light emitting diode applied to the OLED device is regarded as a next-generation light source which is self-luminous. The OLED has excellent advantages in terms of viewing angle, contrast, response time, and power consumption as compared with the LCD device. Furthermore, the OLED has a surface-emitting structure and thus can be easily implemented to be flexible. The OLED device includes a plurality of pixels. Each of the plurality of pixels includes at least a red sub pixel, a green sub pixel, and a blue sub pixel. The red sub pixel, the green sub pixel, and the blue sub pixel emit red, green, and blue lights, respectively. A full-color image may be provided through a plurality of sub pixels. Herein, each of the plurality of pixels includes an emission area where a red, green, or blue light is emitted and a non-emission area. In order to dispose organic emission layers on the red sub pixel, the green sub pixel, and the blue sub pixel, respectively, a predetermined process margin is needed between the organic emission layers. Since an organic emission layer is not disposed or a bank layer is disposed to define pixels due to a process margin, a non-emission area is present between emission areas. Recently, the OLED device has been developed to have a smaller size and a higher resolution. Thus, the size of a pixel is decreased. Even if a pixel size is decreased, a fine metal mask (FMM) used in disposing an organic emission layer needs a process margin. Thus, a non-emission area corresponding to the process margin for the FMM cannot be greatly reduced. Accordingly, as the resolution of an OLED device is increased, the size of a sub pixel is decreased or maintained due to a process margin for an FMM. Thus, it is difficult to develop a high-resolution OLED device. An example of a pixel array structure and an organic light emitting display including the same is discussed in Korean Patent Publication No. 2014-0020120(US patent No. 9,324,262). SUMMARY OF THE INVENTION The inventors of the present disclosure recognized a method of arranging sub pixels between pixels to minimize a distance between the sub pixels in a high-resolution structure of an organic light emitting display device. Then, the inventors of the present disclosure invented an organic light emitting display device having a high-resolution structure in which the size of a sub pixel can be increased. Accordingly, an object to be achieved by the present disclosure is to provide an organic light emitting display device which arrange at least one sub pixel to be separated into two parts and arranging sub pixels emitting the same color to be adjacent to each other, to increase the size of the pixel in a high-resolution structure. Another object to be achieved by the present disclosure is to provide an organic light emitting display device which the size of a sub pixel is increased in a high-resolution structure, and, thus, power consumption can be reduced and a life span can be improved. The objects of the present disclosure are not limited to the aforementioned objects, and other objects, which are not mentioned above, will be apparent to a person having ordinary skill in the art from the following description. The objects are solved by the features of the independent claim. According to one aspect of the present disclosure, an organic light emitting display device includes a plurality of pixels, each of the plurality of pixels including at least one red sub pixel, at least one green sub pixel, and at least one blue sub pixel. Red sub pixels and blue sub pixels of adjacent pixels are aligned in a first direction and are also aligned in a second direction, the second direction being a direction that intersects th