| 摘要 |
PURPOSE: An optical sheet for reinforcing a thermal characteristic of wrinkle is provided to prevent deformation by heat. CONSTITUTION: An optical sheet(100) includes a base film(110) and a protrusion part(120). The protrusion part is placed on one side of the base film. The base film is made of a transparent material. The base film comprises a first layer(112), a second layer(114), and a third layer(116). The first layer relatively has a big thermal expansion coefficient. The second layer is respectively laminated on the upper and lower side of the first layer and has relatively smaller thermal expansion coefficient than that of the first layer. The second layer and the third layer have the same thermal expansion coefficient. |
