Fingerprint sensor integrated display using holographic optical element

Patent metadata

Field	Value
Publication number	US-10747175-B2
Application number	US-201815964023-A
Country	US
Kind code	B2
Filing date	Apr 26, 2018
Priority date	Apr 28, 2017
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A fingerprint sensor integrated display using a holographic optical element and a recording and reconstruction method of the holographic optical element are disclosed. The fingerprint sensor integrated display includes a display panel on which an input image is displayed, a transparent substrate disposed on the display panel, and a light entering element configured to irradiate light from a light source onto the transparent substrate. A particular type of visual information is reconstructed through a holographic element at a location of the light entering element.

First claim

What is claimed is:

1. A fingerprint sensor integrated display comprising:
a display panel on which an input image is displayed;
a fingerprint sensor disposed on the display panel, the fingerprint sensor configured to sense a fingerprint;
a transparent substrate disposed on the display panel; and
a light entering element configured to irradiate light from a light source onto the transparent substrate,
wherein a pre-determined visual information different from the fingerprint is reconstructed as a holographic image through a holographic element at a location of the light entering element.

2. The fingerprint sensor integrated display of claim 1 , wherein the holographic element has a recording surface,
wherein an interference pattern is present in a portion of the recording surface, and the pre-determined visual information is recorded on another portion of the recording surface,
wherein the holographic element is integrated with the light entering element.

3. The fingerprint sensor integrated display of claim 1 , wherein the holographic element is a virtual image reconstruction element disposed on the light entering element,
wherein the virtual image reconstruction element reconstructs the pre-determined visual information with the holographic image reconstructed by diffracted light reflected from a recording surface on which an interference pattern is formed.

4. The fingerprint sensor of claim 1 , wherein the pre-determined visual information different from the fingerprint is reconstructed as the holographic image in response to incidence of external light on the light entering element.

5. The fingerprint sensor of claim 1 , wherein the light entering element overlaps the light source.

6. A fingerprint sensor integrated display comprising:
a display panel on which an input image is displayed;
a transparent substrate disposed on the display panel;
a light entering element configured to irradiate light from a light source onto the transparent substrate, and
a light shielding layer pattern in contact with the light entering element,
wherein a pre-determined visual information is patterned on the light shielding layer pattern.

7. The fingerprint sensor integrated display of claim 6 , further comprising:
an image sensor disposed below the display panel;
a light exiting element disposed on a screen of the display panel and between the display panel and the transparent substrate and configured to refract a portion of light travelling within the transparent substrate so that the portion of the light travelling within the transparent substrate travels toward the display panel through a lower surface of the transparent substrate; and
a low refractive index layer disposed between the light exiting element and the display panel and having a refractive index less than a refractive index of the light exiting element,
wherein the light source is disposed below an edge of the transparent substrate,
wherein the light entering element is disposed between the light source and the transparent substrate and refracts light from the light source at an angle at which light is able to be totally reflected within the transparent substrate.

8. A fingerprint sensor integrated display comprising:
a display panel on which an input image is displayed;
a transparent substrate disposed on the display panel;
a light entering element on the transparent substrate, the light entering element configured to irradiate light from a light source onto the transparent substrate; and
a virtual image reconstruction element disposed on the light entering element,
wherein the virtual image reconstruction element reconstructs a particular type of visual information with a virtual image reconstructed on a holographic element having an interference pattern.

9. The fingerprint sensor integrated display of claim 8 , further comprising:
an image sensor disposed below the display panel;
a light exiting element disposed on a screen of the display panel and between the display panel and the transparent substrate and configured to refract a portion of light travelling within the transparent substrate so that the portion of the light travelling within the transparent substrate travels toward the display panel through a lower surface of the transparent substrate; and
a low refractive index layer disposed between the light exiting element and the display panel and having a refractive index less than a refractive index of the light exiting element,
wherein the light source is disposed below an edge of the transparent substrate,
wherein the light entering element is disposed between the light source and the transparent substrate and refracts light from the light source at an angle at which light is able to be totally reflected within the transparent substrate.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Guensik
• Choo Kyoseop
• Ryu Seungman
• Lee Junghoon

Classifications

• G03H1/2202 Primary

  Reconstruction geometries or arrangements · CPC title

• G02B5/32 Primary

  Holograms used as optical elements · CPC title

• G06V10/88

  Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters · CPC title

• G06V40/1324

  by using geometrical optics, e.g. using prisms (G06V40/1312 takes precedence) · CPC title

• G06V40/1365

  Matching; Classification · CPC title