Nec Display Solutions, Ltd.

Sharp Nec Display Solutions, Ltd.

Shinichiro Chikahisa

Isao Takahashi

Hiromi Katayama

A light source device for generating excitation light that is irradiated to a phosphor includes: a plurality of light sources that emits laser light; and a microlens array that includes a plurality of microlenses arranged in two directions orthogonal to each other, that is incident the laser light emitted from the light source, and that irradiates the phosphor with the output light as an excitation light. The light source image of the light source at the irradiated surface of the microlens array is elliptical, and the long axis direction of the light source image intersects with both the two directions. A coordinate system includes: a first axis that is parallel to a principal ray of the laser light incident on the microlens array; and a second axis, in a direction in which the laser light emitted from the microlens array or the fluorescence emitted from the phosphor is reflected.

Light source device, projector and light intensity distribution uniformization method

A light source device includes: a light source unit provided with a plurality of laser light sources provided in an array, the laser light sources being divided into first and second laser light source groups; a first diffusion plate that diffuses light emitted by the first laser light source group and emits first diffused light; a second diffusion plate that diffuses light emitted by the second laser light source group and emits second diffused light having a diffusion angle greater than that of the first diffused light; and optical path merging members that bend the optical path of the first diffused light to merge the optical path of the first diffused light with the optical path of the second diffused light and supply third diffused light in which the first and second diffused light are mixed.

Light source device including laser light sources, projector, and speckle reduction method for forming light by mixing diffused lights emitted from laser light source groups

A projection display apparatus that can prevent deviation in the light quantity distribution of the projected image is provided. A projection display apparatus includes: a light source unit including a light emitting element; an image light generator modulating light from the light source unit to emit image light; a projecting unit projecting the image light; a polarization modulator on which the image light is made incident and that emits light in a particular polarization state; and a depolarizer arranged on the optical path between the light emitting element and the polarization modulator.

Projection display apparatus and projection method for projection display apparatus

A light source device capable of improve energy efficiency is provided. A light source device includes a yellow phosphor that emits yellow fluorescence excited by exciting light, a red laser light source that emits red laser light, a first light combining unit that generates first composite light by combining the emitted yellow fluorescence with the emitted red laser light, a blue laser light source that emits blue laser light, and a second light combining unit that generates second composite light by combining the combined first composite light with the emitted blue laser light.

Light source device, projection-type display device, and light generation method

A projection display apparatus is provided with a liquid crystal panel, and first to third polarizing layers are arranged on an optical path of light. The transmission axis of the first polarizing layer and the transmission axis of the second polarizing layer orthogonally intersect with each other. The transmission axis of the second polarizing layer and the transmission axis of the third polarizing layer are parallel to each other. The first compensation layer compensates a phase difference generated due to pre-tilt angle on the entering side of the liquid crystal panel. The second compensation layer compensates a phase difference generated due to a pre-tilt angle on the outgoing side of the liquid crystal panel. The third compensation layer compensates a phase difference generated due to deviation between the polarization axis of the light entering the third polarizing layer and the transmission axis of the third polarizing layer.

Growing community of inventors

Tokyo, Japan

Shinichiro Chikahisa