Sun Yat-senuniversity

Dongdong Teng

Lilin Liu

The invention discloses a near-eye display module based on pixel-block-aperture structures, which includes more than one pixel-block-aperture structures. The divergence angle and propagation direction of the light beam from a pixel is specially modulated, and the light beams from pixels of adjacent pixel-block-aperture structures are endowed with different orthogonal characteristics, to guarantee the light beam from a pixel transmitting to the viewer's pupil only through corresponding aperture(s) for Maxwellian View or one-pupil-multi-view display. The arrangement of multiple pixel-block-aperture structures makes a large field of view (FOV) realizable, and the orthogonal-characteristics design can suppress the crosstalk between adjacent pixel-block-aperture structures effectively.

Near-eye display module, I-type composite display module, II-type composite display module, and III-type composite display module based on pixel-block-aperture structures

The invention discloses an optical-waveguide display module with multiple light sources, including a light-source array of timing-orthogonal-characteristic, a relay device, a display device of orthogonal-characteristic, an optical waveguide device, a converging device, a control device, and other components. The light-source array of timing-orthogonal-characteristic includes more than one orthogonal-characteristic light sources. All orthogonal-characteristic light sources are switched on and off in each time cycle sequentially, with only one orthogonal-characteristic light source being switched on at a time-point of each time cycle. By designing the spatial distribution of converging spots of lights from different orthogonal-characteristic light sources, one two-dimensional image is projected into the pupil of the viewer in each time cycle, which realizes VAC-free three-dimensional display based on Maxwellian view technology or More-than-one-view-one-pupil technology.

Optical-waveguide display module with multiple light sources

The invention discloses a near-eye display module which includes at least one projection module, a bracing structure, and a control unit, releasing the eye's focus from a fixed plane. A projection module consists of more than one projection units, and the bracing structure functions as a holder for these projection units. A projection unit includes a display panel, a converging device which converges the light beams incident onto or outgoing from the display panel, and a deflection aperture which deflects the light coming from the converging device. The viewer wears two such near-eye display modules as eye-glasses. In the near-eye display module corresponding to an eye, the projection units of a same projection module jointly project at least one whole image to this eye, for VAC-free (Convergence-Accommodation conflict-free) three dimensional (3D) display based on Maxwellian view or multiple-images-one-eye.

Near-eye display module releasing the eye's focus from fixed plane

The invention discloses a three-dimensional display module using optical wave-guide for providing directional backlights. This display module includes a wave-guide backlight unit with time-sequential directional light sources, a display device, a wavefront modulation device or a light splitting device, and other components. The wave-guide backlight unit with time-sequential directional light sources includes a sequential-switching light-source array, a relay device, and an optical wave-guide device. Each light source of the sequential-switching light-source array provides backlight of corresponding vector characteristics to the display device, making optical message displayed by the display device being guided to the corresponding viewing zone/viewing zones. Through the technology routes of multiple-view-for-one-pupil or/and Maxwellian view, the three-dimensional display module implements displays free from the vergence-accommodation conflict. The introduction of the optical wave-guide device results in a thin structure, and the disclosed display module can be applied to various display terminals, such as mobile phones, iPads, head-mounted VR/AR, etc.

Three-dimensional display module using optical wave-guide for providing directional backlights

The invention discloses a three-dimensional display method for large field of view and small viewing-zone interval. A display screen constructed by sub-screens with adjacent ones emitting lights of different exclusive optical characteristics is employed, and sequentially-switching aperture-arrays are placed close to a pupil of the viewer. M apertures of an aperture array correspond to the M sub-screens by a one-to-one manner in turn, to make the transmittance of each aperture to the light from the corresponding sub-screen be greater than that to the lights from the adjacent non-corresponding sub-screens by a ratio larger than 9. The corresponding apertures of a sub-screen in different aperture-arrays are arranged with an interval not larger than the diameter of the pupil. At a time-point, only one aperture-array gets open, and all aperture-arrays get open sequentially at different time-points of a time-period. At each time-point, each sub-screen presents optical information to the corresponding turned-on aperture synchronously. When the time-period is small enough, a three-dimensional display with large field of view and small viewing-zone interval gets implemented.

Three-dimensional display method for large field of view and small viewing-zone interval

The invention features techniques for presenting more than one perspective views to each eye of the viewer, through generating viewing zones with an interval smaller than the diameter of the viewer's pupil by display panel/grating pair/pairs. In the first method, the arraying direction of the small-interval viewing zones is designed having an appropriate small inclination angle to the line connecting the viewer's two pupils, so as to cover each eye with more than one viewing zones which are different with each other. In the extreme case, 4 small-interval viewing zones can implement 3D display with two views for each eye. This is absolutely different with existing grating-based 3D display, which aligns viewing zones along the direction with a small angle (&#x3c;&#x3c0;/4) to the line connecting the viewer's two pupils and thus a rather large number of small-interval viewing zone is needed for covering the viewer's two eyes.

Grating based three-dimentional display method for presenting more than one views to each pupil

The invention features techniques and systems for presenting two or more perspective views to each eye of the viewer, through division multiplexing of the viewer's entrance-pupil. The system is constituted by a selective-aperture array with each aperture being transparent only to light beams with some special characteristics, at least one display screen for optical information presentation, and other optional elements. The optical message on at least one display screen propagates to the selective-aperture array directly, or be directed to the selective-aperture array or the eye of the viewer by other optional elements. Through selective filtering by the apertures with temporal filtering characteristics or exclusive filtering characteristics, multiple perspective views get presented to an eye of the viewer through the selective-aperture array. Light rays different perspective views superimpose into real spatial light spots that the eye can focus on naturally, resulting in overcoming of the accommodation-convergence conflict.

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Guangdong, China

Dongdong Teng