Dispelix Oy

Kasimir Blomstedt

Juuso Olkkonen

Mika Aikio

Antti Sunnari

Ismo Vartiainen

Jussi Rahomäki

Mikhail Erdmanis

The invention concerns a diffractive element, a method of producing a viewable image and an optical device. The element comprises a waveguide and a diffractive out-coupling region arranged on a surface or inside the waveguide, the out-coupling region comprising a plurality of sub-regions arranged laterally with respect to each other and being adapted to couple light propagating in the waveguide out of the waveguide. According to the invention, the sub-regions each comprise a doubly periodic grating pattern having a first period in a first direction and a second period in a second direction different from the first direction, and wherein there are at least two sub-regions having different grating patterns. The invention allows for combining out-coupling and exit pupil expansion on a single region of a waveguide.

Diffractive element with doubly periodic gratings

The invention relates to a selective diffractive grating and applications thereof. The grating comprised in a periodic alternating pattern first material having a first dispersion curve (n), and second material having a second dispersion curve (n) different from the first dispersion curve (n). According to the invention, the first and second dispersion curves (n−i, n 2) intersect each other at two or more different wavelengths (λλ).

Diffractive grating

The invention concerns a waveguide display and display element therefor, and a method of designing a waveguide element. The element comprises a waveguide and at least one grating arranged on or within the waveguide, the at least one grating being arranged to couple visible light into, within, and/or out of the waveguide. According to the invention, the period of the grating is in the range of 5 μm or more. The invention increases freedoms of design of grating-based display elements and allows for better color and FOV control.

Waveguide display and display element with novel grating configuration

The invention relates to a waveguide display element comprising a waveguide body and an in-coupling grating () arranged to the waveguide body. The in-coupling grating () is configured to couple incoming light into the waveguide body into two separate directions (A,B) using opposite diffraction orders (IC:+1, IC:−1) for splitting the field of view of the incoming light. Further the in-coupling grating () is configured, typically by setting its period suitably short, such that said coupling takes place only at wavelengths below a threshold wavelength residing in the visible wavelength range. The invention also relates to a waveguide stack (A,B,C).

Waveguide element and waveguide stack for display applications

A diffractive waveguide element for a personal display device includes a display waveguide extending in a waveguide plane, an in-coupling diffractive optical element arranged onto or into the display waveguide for diffractively coupling light rays into the display waveguide, and an out-coupling diffractive optical element arranged onto or into the display waveguide for coupling the diffractively coupled light rays out of the display waveguide. In addition, there is provided a ray multiplier element optically upstream of the out-coupling diffractive optical element, the ray multiplier element being capable of splitting a light ray incoming to the in-coupling grating into a plurality of parallel rays spatially displaced in the waveguide plane before they enter the out-coupling diffractive optical element. A waveguide display device is also provided.

Diffractive waveguide element and diffractive waveguide display

The invention relates to a diffractive waveguide display device comprising an image projector capable of emitting laser rays at one or more wavelengths, a waveguide body having a first surface and an opposite second surface and adapted to guide said laser rays from the image projector between the first surface and the second surface, an out-coupling diffractive optical element on said first surface for coupling said laser rays out of the waveguide body, and an anti-interference coating () arranged on the second surface of the waveguide body aligned with the out-coupling diffractive optical element.

Interference-free waveguide display

The invention relates to a laser projector for presenting an image on a waveguide plane. The projector comprises a laser source (A,B,C) capable of emitting a polychromatic light beam () or a plurality of narrow-wavelength light beams (A,B,C), and a guidance element (A,B) for directing light emitted by the light source to different pupils (A,B,C) of the waveguide plane, the different pupils being displaced with respect to each other in the waveguide plane. The invention also concerns a personal display device comprising such projector.

Laser projector and diffractive display device

The invention relates to a waveguide display element for guiding an image from a first lateral zone of the element to a second lateral zone of the element, the element comprising a plurality of waveguide layers (A-E) on top of each other. The element further comprises at least one intermediate diffractive optical element (AB,BC,AD,DE) arranged between two of said waveguide layers. The intermediate diffractive optical element (AB,BC,AD,DE) is adapted to change the distribution of propagating light power between the layers. The invention also concerns a diffractive display device comprising such element.

Multilayer waveguide display element

The invention relates to a waveguide display element comprising a waveguide comprising at least three waveguide layers stacked on top of each other. There is also provided diffractive in-coupling gratings associated with each waveguide layer and being displaced with respect to each other in the plane of the layers, the in-coupling gratings forming input pupils for different light wavelength ranges coupled to the waveguide, and a diffractive out-coupling means for coupling light in-coupled through the pupils and propagating in the layers out of the waveguide such that a polychromatic image is formed. The invention also concerns a personal display device comprising such element.

Multipupil waveguide display element and display device

The invention provides a diffractive waveguide element, waveguide stack, personal display and method of forming a viewable image. The element comprises a waveguide region defined by two optical surfaces between which light can propagate by total internal reflections, the optical surfaces having surface profiles, and at least one diffractive grating capable of modifying the light filed within the waveguide region. According to the invention, the surface profile of at least one of said optical surfaces is a staircase profile.

Curved staircase waveguide element, personal display device and method of producing an image

A waveguide display element includes waveguide layers stacked on top of each other and an in-coupler associated with each waveguide layer for coupling light within a predefined wavelength band into the waveguide layer. Each of the in-couplers includes an intermediate layer arranged on the waveguide layer, the intermediate layer having intermediate layer properties. Each of the in-couplers further includes an in-coupling grating arranged on the intermediate layer, the grating having grating properties. The combination of the intermediate layer properties and grating properties of each in-coupler is different with respect to other in-couplers.

Waveguide display element with an intermediate layer between an in-coupling grating and a waveguide

A waveguide display element includes a waveguide comprising two opposing main surfaces, a first optical element arranged at a first location of the waveguide, a second optical element arranged at a second location of the waveguide, and at least one reflector surface extending between said main surfaces and adapted to reflect light rays propagating within the waveguide. The reflector surface is adapted to redirect light rays from the first optical element to the second optical element.

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Espoo, Finland

Kasimir Blomstedt