Title:
SCREEN PROTECTION FILM AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/134197
Kind Code:
A1
Abstract:
The present invention relates to the technical field of display materials, and provides a screen protection film and a manufacturing method therefor. A base material layer of the screen protection film is a polyester film having retardation of 5000-20000 nm; the polyester film has different refractive indexes in different movement directions, width directions, and thickness directions, and therefore, when in oblique observation, a concentric circular rainbow pattern can sometimes be generated to affect an observation effect. According to the present invention, by controlling the retardation of the polyester film to be 5000-20000 nm, in-plane birefringence of the polyester film is increased, a retardation change based on an observation angle is weakened, such that no obvious rainbow pattern can be observed in a visual angle, and the rainbow pattern of the polyester film base material per se is effectively reduced.
Inventors:
JIN YADONG (CN)
WANG XU (CN)
HUANG YAOBIN (CN)
ZHOU YUBO (CN)
ZHENG YIER (CN)
ZHU ZHENGPING (CN)
WANG XU (CN)
HUANG YAOBIN (CN)
ZHOU YUBO (CN)
ZHENG YIER (CN)
ZHU ZHENGPING (CN)
Application Number:
PCT/CN2020/142527
Publication Date:
June 30, 2022
Filing Date:
December 31, 2020
Export Citation:
Assignee:
NINGBO SOLARTRON TECH CO LTD (CN)
International Classes:
C09J7/25; C08J7/046; C08L67/02; C09D7/61; C09D175/04; C09J7/38; C09J11/06; C09J11/08; C09J183/04
Foreign References:
| CN106094091A | 2016-11-09 | |||
| CN106497183A | 2017-03-15 | |||
| CN108527986A | 2018-09-14 | |||
| JP2004292493A | 2004-10-21 |
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
Download PDF: