公开(公告)号：US11536876B2

公开(公告)日：2022-12-27

申请号：US16917112

申请日：2020-06-30

Applicant: Shanghai Tianma Micro-Electronics Co., Ltd.

Inventor： Yuefeng Gu ,  Jun Zhou ,  Ruifen Fu ,  Jiandong Wang

IPC: G02B1/115 ,  G06F3/044 ,  G02F1/1333 ,  G02F1/1335 ,  H01L27/32 ,  H01L51/52 ,  G06F3/041

Abstract: Provided are a composite membrane, a touchpad and a display device. The composite membrane includes a first graded-refractive-index layer, a first dielectric layer and a second graded-refractive-index layer which are stacked in sequence; where the first graded-refractive-index layer includes at least two first sub-layers, and the second graded-refractive-index layer includes at least two second sub-layers; in a direction from the first graded-refractive-index layer to the first dielectric layer, refractive indexes of first sub-layers sequentially increase, and refractive indexes of second sub-layers sequentially decrease; a refractive index of a first sub-layer adjacent to the first dielectric layer is less than or equal to a refractive index of the first dielectric layer; and a refractive index of a second sub-layer adjacent to the first dielectric layer is less than or equal to the refractive index of the first dielectric layer.