Polarizing sheet, display screen, terminal, and method for manufacturing polarizing sheet

Patent metadata

Field	Value
Publication number	US-11280946-B2
Application number	US-201916555048-A
Country	US
Kind code	B2
Filing date	Aug 29, 2019
Priority date	Jan 11, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A polarizing sheet includes a base layer, and a polarizing layer attached to the base layer. The polarizing layer includes, in a same plane, a combination of any two or more of a first region, a second region, or a third region. The first region, the second region and the third region have different light transmission properties.

First claim

The invention claimed is:

1. A polarizing sheet, comprising:
a base layer; and
a polarizing layer, attached to the base layer and comprising, in a same plane, a combination of a first region, a second region and a third region, wherein the first region, the second region and the third region have identical thicknesses,
wherein the first region has a transmittance lower than a transmittance of the second region; and the third region is located between the first region and the second region and has a transmittance between the transmittance of the first region and the transmittance of the second region;
wherein the transmittance of the second region is greater than 50%;
wherein the first region has a polarizing function, the second region has no polarizing function, and the third region has a polarizing function between the polarizing function of the first region and the polarizing function of the second region; and
wherein the polarizing function of the first region and the polarizing function of the third region are obtained with a same polarizing material.

2. The polarizing sheet according to claim 1 , wherein the first region comprises a polarizing material having the polarizing function; and
the second region does not comprise the polarizing material.

3. The polarizing sheet according to claim 1 , wherein the first region comprises a first polarizing material having the polarizing function; and
the second region comprises a second polarizing material having no polarizing function.

4. The polarizing sheet according to claim 3 , wherein the second region having no polarizing function is obtained by deactivating the polarizing function of the second region by means of at least one of:
grinding the second polarizing material by a computer numerical control CNC technology;
heating the second polarizing material;
etching the second polarizing material;
misaligning polarizing molecules in the second polarizing material; or
irradiating the second polarizing material by ultraviolet.

5. The polarizing sheet according to claim 1 , further comprising: a release film, a pressure sensitive adhesive PSA layer, a lower tri-acetyl cellulose TAC film, an upper TAC film, and a protective film from bottom to top;
wherein the base layer is located between the lower TAC film and the upper TAC film; and
the polarizing layer is located between the base layer and the upper TAC film or located between the base layer and the lower TAC film; or
the polarizing layer is located between the base layer and the upper TAC film and located between the base layer and the lower TAC film.

6. The polarizing sheet according to claim 1 , wherein the polarizing function of the third region is obtained by
grinding off the polarizing material in the third region by a computerized numerical control (CNC) technology; or
removing the polarizing function of the polarizing material in the third region by at least one of: local heating; local etching; or applying a magnetic field.

7. A terminal, comprising:
a display screen, comprising:
a display panel; and
a polarizing sheet, comprising:
a base layer; and
a polarizing layer, attached to the base layer, and comprising, in a same plane, a combination of a first region, a second region having a light transmission property superior to that of the first region, and a third region located between the first region and the second region and having a light transmission property superior to that of the first region but inferior to that of the second region, wherein the first region, the second region and the third region have identical thicknesses; and

an optical component disposed under the second region;
wherein a transmittance of the second region is greater than 50%;
wherein the first region has a polarizing function, the second region has no polarizing function, and the third region has a polarizing function between the polarizing function of the first region and the polarizing function of the second region; and
wherein the polarizing function of the first region and the polarizing function of the third region are obtained with a same polarizing material.

8. The terminal according to claim 7 , wherein the display panel comprises:
a substrate; and
a display layer, disposed above the substrate and comprising:
a first display region corresponding to the first region; and
a second display region corresponding to the second region and having a light transmission property superior to that of the first display region,

wherein the optical component is disposed under the second display region;
wherein sizes of sub-pixels in the second display region are set to be larger that of sub-pixels in the first display region.

9. The terminal according to claim 8 , wherein the display layer further comprises a third display region corresponding to the third region and located between the first display region and the second display region;
wherein sizes of sub-pixels in the third display region are larger than that of the sub-pixels in the first display region but smaller than that of the sub-pixels in the second display region.

10. The terminal according to claim 7 , wherein
the display panel is an organic light-emitting diode (OLED) display panel, and the polarizing sheet is located above the OLED display panel; or
the display panel is a liquid crystal display (LCD) panel, and the display screen comprises an upper polarizing sheet located above the LCD panel and a lower polarizing sheet located under the LCD panel.

11. The terminal according to claim 7 , wherein the polarizing function of the third region is obtained by
grinding off the polarizing material in the third region by a computerized numerical control (CNC) technology; or
removing the polarizing function of the polarizing material in the third region by at least one of: local heating; local etching; or applying a magnetic field.

12. A method for manufacturing a polarizing sheet, the method comprising:
providing a base layer; and
producing a polarizing layer on the base layer,
wherein
the polarizing layer comprises, in a same plane, a combination of a first region, a second region and a third region;
the first region, the second region and the third region have identical thicknesses;
the first region has a transmittance lower than a transmittance of the second region; and the third region has a transmittance between the transmittance of the first region and the transmittance of the second region;
the transmittance of the second region is greater than 50%;
the first region has a polarizing function, the second region has no polarizing function, and the third region has a polarizing function between the polarizing function of the first region and the polarizing function of the second region; and
the polarizing function of the first region and the polarizing function of the third region are obtained with a same polarizing material.

13. The method according to claim 12 , wherein the producing a polarizing layer on the base layer comprises:
coating the base layer with an impregnation solution comprising a polarizing material;
providing a barrier layer on such a region of the base layer coated with the impregnation solution that corresponds to at least one of the second region or the third region;
orienting the base layer provided with the barrier layer by applying a magnetic field or by stretching, such that polarizing molecules in the polarizing material are aligned in a specified manner;
immobilizing and drying the polarizing material; and
removing the barrier layer to obtain the polarizing layer on the base layer.

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Chen Wei
• Xu Zhiwen
• Chen Jiwei

Classifications

• H10K59/8793

  Arrangements for polarized light emission (H10K59/8791 takes precedence) · CPC title

• G02B5/3033 Primary

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title

• G02B5/30 Primary

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title