Ntt Docomo, Inc.

Other

Docomo, Inc.

Fusho Ishii

Mikiko Nakanishi

Fusao Ishii

Kazuhiko Takahashi

Yuji Aburakawa

Keiichi Murakami

Kazuoki Ichikawa

Mikio Iwamura

Tsutomu Horikoshi

Masashi Tsuboi

Yuji Abrakawa

Yasuhiro Takagi

Yasuhiro c/o National University Corp Tokyo Takagi

A projection display having an optical light guide for a see-though display system using holographic optical element or diffractive optical element as in-coupling optics and combined with Fresnel mirrors as out-coupling optics is disclosed. A display using this light guide enables a wide angle (e.g., over 90 degrees field of view), high resolution, and a large eye-box with a compact size.

Optics of a display using an optical light guide

A compact light source for a projection display is disclosed enabling eye-glass display using a Fresnel mirror reflecting light without a distance as conventional prism type reflector.

Image device with a compact homogenizer

A compact integrator of light beams is disclosed using a diffractive optical element to integrate multiple beams into a single beam regardless of wavelength or polarization.

Light source for projection display

A see-through image display system having a DOE often has undesirable light or so called ghost images due to the quantization of saw tooth shape of DOE surface. This invention provides ways to eliminate ghost images.

Ghost image elimination of doe using fourier optics method

A see-through image display system having a laser-beam-scanner has a very small eyebox when a laser beam is directly projected into eye. This invention provides a solution to increase the size of eyebox using a free-form-mirror to create a real image with high NA without exit-pupil-expander.

Optics of wearable display using laser beam scanner

A see-through image display system having an Exit-Pupil-Expander (EPE) to enlarge the eyebox of display is disclosed. The EPE uses a hologram functioning as a micro-lens-array as well as collimation lens.

Optics of wearable display to increase eye-box

A see-through image display system with high resolution up to 4K, wide field of view (FOV) beyond 60 degrees and small form factor is proposed. The optics for the display incorporates optical elements including hologram, DOE, lens and mirror with free form surfaces. This display system is suitable for a wearable display.

Optics of wearable display devices

A compact illuminator for a see-through image display system with highly uniform light distribution is disclosed. This invention enables wearable displays such as eye-glass type see-through display. This system provides a wide divergent beam from a display device so that a viewer can have a large eyebox.

Illuminator for a wearable display

It is an object of the present invention to display unnaturalness-free images without showing an observer repetitive images in accordance with the observer's viewpoint. A light beam control elementlimits a viewing area of images composed of light emitted from a light source array. Here, a terminal position detection sensoror an observer position detection sensordetects a relative positional relationship between the observer's eye observing the image formed by the light emitted from the light source array, and the light source arrayand the light beam control element. Based on the positional relationship detected by these sensors, a display image control devicecontrols the light source arrayso as to change display contents of the light forming the image with the viewing area limited by the light beam control element

Image display device and method having image control unit preventing light source unit from outputting an image when observer is outside of predefined normal viewing area

Growing community of inventors

Tokyo, Japan

Mikiko Nakanishi