OLED mask is a thin plate that allows only certain locations
to be deposited when manufacturing OLED displays.
The mask is used in the deposition process to form a light emitting layer on the backplane after the backplane is completed during the display
manufacturing process. The precision of the OLED mask determines the resolution of the OLED substrate by aligning the metal mask with
the same pattern as the thin film pattern to be formed on the OLED substrate and depositing the raw material of the thin film to form the desired
pattern. Sewoo Incorporation's high-precision OLED mask is delivered to the top of global display companies and is used in the best OLED substrate
and flexible display manufacturing process.
Rigid : A type of OLED mask, which is used in the process of depositing organic patterns on the mother glass
CVD : A type of OLED mask, which is used in chemical vapor deposition that is required in the thin film sealing process to protect OLED organic materials
The OLED displays images on the display in pixels.
The combination of the three primary colors of light, Red, Green, and Blue, determines the color of the pixel. An OLED mask is used to
forms a subpixel which the organic matter that gives off each color.Each pixel in the OLED display ledger shall be deposited with
a light-emitting organic material corresponding to R, G, B in the correct position. At this time, a small, dense circular pattern
of the OLED mask allows the luminescent organic matter to be deposited in the desired position.
When subpixel deposition is completed, the EML(Emitting Layer) of the OLED is completed, followed by a light emission
auxiliary layer film formation and encapsulation process.
When a large OLED substrate is made, it is carried out through a split mask.
The metal mask used in the OLED process is made from a raw material called Invar, which minimizes the deflection of the raw material when using
a split mask and is used for the alignment of the mask. Due to the physical properties of the in-bar, it is difficult to predict and prevent the sagging
of the mask, and the precision of the alignment stick is directly linked to the specifications of the large substrate, requiring a difficult technique
to manufacture the stick. Sewoo In Corporation has been researching its own stick manufacturing technology through Research & Development
for many years, and manufactures and delivers the world's best sticks with Sewoo's know-how.
Types of Sticks : Align Stick, TV Stick, etc