| 摘要 |
The present invention aims to providing an optical film, an optical diaphragm and a liquid display module, which are small in phase difference change caused by an external force and excellent in optical uniformity, and can by used for displaying a subtle image, wherein the optical film comprises a cycloolefin copolymer as a main component, the photoelastic coefficient of the optical film is preferably lower than 10*10-12/Pa, the average thickness of the optical film is preferably higher than 10 microns and lower than 500 microns, the absolute value of the phase difference value (Re) of the optical film is preferably lower than 50 nm, the optical diaphragm comprises a transparent conductive layer, a hard coating layer, a light diffusion layer or a prism layer on one surface of the optical film, and the liquid display module is provided with the optical diaphragm. |
