1. Field
Aspects of one or more embodiments relate to a display device and a manufacturing method thereof.
2. Description of the Related Art
A display device is an apparatus for displaying an image, and, recently, organic light-emitting display devices have attracted attention. Unlike a liquid crystal display device, an organic light-emitting display device has self-emission characteristics and does not require a separate light source, and, thus, a thickness and a weight of an organic light-emitting display device may be reduced. Organic light-emitting display devices exhibit high-quality characteristics such as low power consumption, high brightness, and high response speeds.
Organic light-emitting display devices include sub-pixels respectively emitting light of different colors, and the sub-pixels display an image by emitting light. Here, a sub-pixel denotes a minimum unit emitting light in order to display an image. A gate line, a data line, a power line such as a driving power line for driving each sub-pixel, and an insulating layer, etc. such as a pixel-defining layer which defines a shape or area of each sub-pixel, may be arranged between adjacent sub-pixels.
An organic emission layer forming a sub-pixel is formed by depositing an organic emission material by using a mask such as a fine metal mask (FMM). In the case in which an interval between adjacent organic emission layers is designed to be short in order to secure an aperture ratio of a sub-pixel, deposition reliability is reduced. In the case in which an interval between adjacent organic emission layers is designed to be long in order to improve deposition reliability, an aperture ratio of a sub-pixel is reduced. An aperture ratio of a sub-pixel denotes a ratio of an area of an organic emission layer through which light is actually emitted to an entire area of a display area in which an image is displayed.
Meanwhile, as a demand for an apparatus displaying a high-quality image increases, resolution of a display device gradually increases. A display device has, for example, a Pentile sub-pixel arrangement structure in which two sub-pixels form one pixel, and an area and a driving current of an organic emission layer are gradually reduced. Due to a difference in an organic emission material of each sub-pixel, organic light-emitting diodes of each sub-pixel have different parasitic capacitances and driving current amounts. Due to differences in a parasitic capacitance and a driving current amount, a sub-pixel of a specific color may emit light of an intended amount at low brightness and later.