Method for enhancing the image of autostereoscopic 3d displays based on angular filtering

Patent metadata

Field	Value
Publication number	US-2022308356-A1
Application number	US-202017619182-A
Country	US
Kind code	A1
Filing date	Jun 17, 2020
Priority date	Jun 21, 2019
Publication date	Sep 29, 2022
Grant date	—

Abstract

Embodiments include 3D display devices and methods of operation. In an example device, a light-emitting layer is provided with an addressable array of light-emitting elements. An optical layer overlays the light-emitting layer. The optical layer includes an array of lenses operative to substantially collimate light from the light-emitting layer. To suppress stay light, an angular filter layer is provided along an optical path from the light-emitting layer to an exterior of the display. The angular filter is operative to substantially block light having an incident angle greater than a threshold angle and to substantially transmit light having an incident angle less than a threshold angle. The angular filter may be a thin-film interference bandpass filter. Different regions of the angular filter may be tuned for different wavelengths of light.

First claim

What is claimed:

1 . A display device comprising:
a light-emitting layer comprising an addressable array of light-emitting elements; an optical layer overlaying the light-emitting layer, the optical layer comprising an array of lenses operative to substantially collimate light from the light-emitting layer; and a transparent angular filter layer along an optical path from the light-emitting layer to an exterior of the display device, the angular filter being operative to substantially block light having an incident angle greater than a threshold angle and to substantially transmit light having an incident angle less than a threshold angle.

2 . The display of claim 1 , wherein the optical layer is a substantially two-dimensional array of converging lenses.

3 . The display of claim 1 , wherein the optical layer is a lenticular array.

4 . The display of claim 1 , wherein the angular filter layer comprises a coating on at least one surface of the optical layer.

5 . The display of claim 1 , wherein the angular filter layer comprises an interference filter having a plurality of dielectric layers.

6 . The display of claim 1 , wherein the angular filter layer comprises a bandpass interference filter layer.

7 . The display of claim 6 , wherein the bandpass interference filter layer comprises different interference layer regions with different passbands.

8 . The display of claim 6 , wherein the bandpass interference filter layer comprises:
a set of red-tuned interference layer regions with a passband substantially tuned for red light, a set of green-tuned interference layer regions with a passband substantially tuned for green light, and a set of blue-tuned interference layer regions with a passband substantially tuned for blue light.

9 . The display of claim 8 ,
wherein each light-emitting element underlies a corresponding interference layer region, and wherein:
the light-emitting elements underlying the red-tuned interference layer regions are configured to emit substantially red light,
the light-emitting elements underlying the green-tuned interference layer regions are configured to emit substantially green light, and
the light-emitting elements underlying the blue-tuned interference layer regions are configured to emit substantially blue light.

10 . The display of claim 1 ,
wherein the optical layer is a substantially two-dimensional array of converging lenses, wherein the angular filter layer comprises a bandpass interference filter layer, wherein the bandpass interference filter layer comprises different interference layer regions with different passbands, and wherein each interference layer region corresponds to a respective one of the converging lenses.

11 . A method of operating a display device, the method comprising:
selectively operating a light-emitting layer comprising an addressable array of light-emitting elements to emit light; at an optical layer overlaying the light-emitting layer, using an array of lenses to substantially collimate at least a portion of the light from the light-emitting layer; and transmitting the light through a transparent angular filter layer along an optical path from the light-emitting layer to an exterior of the display device, the angular filter layer being operative to substantially block light having an incident angle greater than a threshold angle and to substantially transmit light having an incident angle less than a threshold angle.

12 . The method of claim 11 , wherein the angular filter layer comprises a coating on at least one surface of the optical layer.

13 . The method of claim 11 ,
wherein the optical layer is a substantially two-dimensional array of converging lenses, wherein the angular filter layer comprises a bandpass interference filter layer, wherein the bandpass interference filter layer comprises different interference layer regions with different passbands, and wherein each interference layer region corresponds to a respective one of the converging lenses.

14 . The method of claim 11 , wherein the angular filter layer comprises a bandpass interference filter layer.

15 . The method of claim 14 , wherein the bandpass interference filter layer comprises:
a set of red-tuned interference layer regions with a passband substantially tuned for red light, a set of green-tuned interference layer regions with a passband substantially tuned for green light, and a set of blue-tuned interference layer regions with a passband substantially tuned for blue light.

Assignees

• Pcms Holdings Inc

Inventors

• Makinen Jukka-Tapani

Classifications

• G02B5/288

  comprising at least one thin film resonant cavity, e.g. in bandpass filters · CPC title

• G02B27/46

  Systems using spatial filters · CPC title

• H04N13/305 Primary

  using lenticular lenses, e.g. arrangements of cylindrical lenses · CPC title

• G02B27/4205

  having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant · CPC title

• G02B5/285

  comprising deposited thin solid films (G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361) · CPC title