Composite membrane, touchpad and display device
US11536876B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2020 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Dec 19, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K59/8791
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.