As the demand for flexible displays increases, many studies concerning more efficient manufacturing processes have been carried out. In the course of manufacturing a flexible display, it is necessary to form a flexible layer (polyimide, PI) on a glass substrate, and the panel is basically manufactur...
As the demand for flexible displays increases, many studies concerning more efficient manufacturing processes have been carried out. In the course of manufacturing a flexible display, it is necessary to form a flexible layer (polyimide, PI) on a glass substrate, and the panel is basically manufactured on PI layer. However, the delamination of PI layer from the glass substrate is required in the final step. For this delamination process, the laser lift-off (LLO) technology is the most widely used. However, the equipment for LLO and the laser sources are not cost effective. In addition, laser processes require very high precision, and the glass substrate cannot be recycled after the delamination process.
In this thesis, a physically-delaminated process of PI layer from glass substrate has been investigated using graphene, a typical two- dimensional material. First, the chemical and thermal properties of graphene oxide (GO) were investigated by XPS/XRD/Raman and TGA, respectively. The morphological studies analyzed by SEM and AFM revealed that the size and the thickness of GO are approximately 10~30 um and 1.487 nm, respectively. The next step was the coating process of GO aqueous suspension onto the glass. In this study, we investigated three different methods such as bar coating, layer-by-layer (LBL), and electrospray. Once the GO layer successfully formed, the GO layer was heated at 200 ℃ for 1 hr to remove volatile impurities, and PI vanish was then coated on the GO layer. The peel test was performed by delaminating the PI layer from the glass substrate.
When 0.1 wt% of GO suspension was coated on glass substrate three times by electrospray under the conditions of two nozzles, discharge speed of 80 uL/min, and air pressure of 0.25 MPa, the transmittance was 94.15 % and the peel strength was 2.57 gf/25 mm. From these results, it was concluded that graphene can be used as a delaminating material between a glass substrate and a PI layer in a flexible display manufacturing process.
As the demand for flexible displays increases, many studies concerning more efficient manufacturing processes have been carried out. In the course of manufacturing a flexible display, it is necessary to form a flexible layer (polyimide, PI) on a glass substrate, and the panel is basically manufactured on PI layer. However, the delamination of PI layer from the glass substrate is required in the final step. For this delamination process, the laser lift-off (LLO) technology is the most widely used. However, the equipment for LLO and the laser sources are not cost effective. In addition, laser processes require very high precision, and the glass substrate cannot be recycled after the delamination process.
In this thesis, a physically-delaminated process of PI layer from glass substrate has been investigated using graphene, a typical two- dimensional material. First, the chemical and thermal properties of graphene oxide (GO) were investigated by XPS/XRD/Raman and TGA, respectively. The morphological studies analyzed by SEM and AFM revealed that the size and the thickness of GO are approximately 10~30 um and 1.487 nm, respectively. The next step was the coating process of GO aqueous suspension onto the glass. In this study, we investigated three different methods such as bar coating, layer-by-layer (LBL), and electrospray. Once the GO layer successfully formed, the GO layer was heated at 200 ℃ for 1 hr to remove volatile impurities, and PI vanish was then coated on the GO layer. The peel test was performed by delaminating the PI layer from the glass substrate.
When 0.1 wt% of GO suspension was coated on glass substrate three times by electrospray under the conditions of two nozzles, discharge speed of 80 uL/min, and air pressure of 0.25 MPa, the transmittance was 94.15 % and the peel strength was 2.57 gf/25 mm. From these results, it was concluded that graphene can be used as a delaminating material between a glass substrate and a PI layer in a flexible display manufacturing process.
Keyword
#graphene graphehe oxide delamination material electrospray flexible display
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