Augmented reality see-through display

Patent metadata

Field	Value
Publication number	US-10613376-B2
Application number	US-201616068798-A
Country	US
Kind code	B2
Filing date	Jan 28, 2016
Priority date	Jan 28, 2016
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

Examples disclosed herein include an augmented reality (AR) see-through display system, which includes a diffractive backlight substrate including diffractive gratings. The display system includes a light source to transmit light into the backlight substrate, wherein the diffractive gratings scatter the light out of the backlight substrate to form an array of directional pixels. The display system includes an LCD panel to modulate the array of directional pixels to form an image that augments a real world view visible through the backlight substrate and the LCD panel.

First claim

The invention claimed is:

1. An augmented reality (AR) see-through display system, comprising:
a diffractive backlight substrate including diffractive gratings and at least one light emitting diode, the at least one light emitting diode to transmit light into the diffractive backlight substrate, wherein the at least one light emitting diode transmits the light into an edge of the diffractive backlight substrate, the edge of the diffractive backlight substrate extending at a non-perpendicular angle relative to both front and rear surfaces of the diffractive backlight substrate, and wherein the diffractive gratings scatter the light out of the diffractive backlight substrate to form an array of directional pixels; and
an LCD panel to receive the light scattered by the diffractive gratings and modulate the array of directional pixels to form an image that augments a real world view visible through the backlight substrate and the LCD panel.

2. The AR display system of claim 1 , wherein the backlight substrate and the LCD panel are substantially transparent.

3. The AR display system of claim 1 , wherein the light transmitted into the edge of the backlight substrate is guided by total internal reflection by a top surface and bottom surface of the backlight substrate.

4. The AR display system of claim 1 , wherein the AR display system has a thickness of less than 1 cm.

5. The AR display system of claim 1 , wherein the backlight substrate is made of glass.

6. The AR display system of claim 1 , wherein the AR display system is implemented in an eyeglass frame.

7. The AR display system of claim 6 , wherein the backlight substrate and the LCD panel completely cover at least one rim of the eyeglass frame.

8. The AR display system of claim 1 , and further comprising a controller to control operation of the LCD panel.

9. An augmented reality (AR) see-through display system, comprising:
an eyeglass frame including a pair of rims that define a pair of openings through which a user can view a real world scene;
a substantially transparent LCD panel positioned over a first one of the openings to modulate an array of directional pixels to form an image that augments the real world scene; and
a substantially transparent diffractive backlight substrate including at least one light emitting diode and positioned over the LCD panel to scatter via diffractive gratings light provided by the at least one light emitting diode to produce the array of directional pixels, wherein the substantially transparent LCD panel is configured to receive the light scattered by the diffractive gratings, wherein the light provided by the at least one light emitting diode is transmitted into an edge of the diffractive backlight substrate, and guided by total internal reflection by a top surface and bottom surface of the diffractive backlight substrate, the edge of the diffractive backlight substrate extending at a non-perpendicular angle relative to both front and rear surfaces of the diffractive backlight substrate.

10. The AR display system of claim 9 , wherein the LCD panel and the backlight substrate have a total thickness of less than 1 cm.

11. A method of providing an augmented reality (AR) view, comprising:
transmitting light from at least one light emitting diode into an edge of a substantially transparent diffractive backlight substrate that includes the at least one light emitting diode and an array of diffractive gratings to scatter the light out of the backlight substrate to form an array of directional pixels, wherein the edge of the diffractive backlight substrate extends at a non-perpendicular angle relative to both front and rear surfaces of the diffractive backlight substrate;
receiving the light scattered by the array of diffractive gratings with a substantially transparent LCD panel; and
modulating the array of directional pixels with the substantially transparent LCD panel to form an image that augments a real world view seen through the backlight substrate and the LCD panel.

12. The method of claim 11 , and further comprising:
directing the image from the LCD panel through a rim of an eyeglass frame.

13. The method of claim 11 , wherein the light transmitted into the diffractive backlight is transmitted into a non-vertical angled edge of the diffractive backlight and guided by total internal reflection by a top surface and bottom surface of the backlight substrate.

Assignees

• Hewlett Packard Entpr Dev Lp

Inventors

• Aieta Francesco

Classifications

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G06T19/006

  Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00) · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B6/0036

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title