Abstract: A control method for a display device includes: acquiring an output signal from a sensor detecting an illuminance in an environment where the display device is arranged; in a case where a first illuminance specified based on the output signal when a reference value of the illuminance in the environment is a first reference illuminance is higher than the first reference illuminance, changing the reference value from the first reference illuminance to a second reference illuminance that is higher than the first reference illuminance; and controlling a brightness of an image displayed on a display surface by the display device, based on a relationship between a second illuminance specified based on the output signal when the reference value is the second reference illuminance, and the second reference illuminance.

Abstract: A control method for a display device includes: determining whether an illuminance in an environment where a display device having a light source is installed belongs to a first range or a second range; when the illuminance in the environment belongs to the first range, adjusting a luminance of the light source by referring to first luminance information designating the luminance corresponding to when the illuminance in the environment belongs to the first range; when the illuminance in the environment belongs to the second range, adjusting the luminance by referring to second luminance information designating the luminance corresponding to when the illuminance in the environment belongs to the second range; when a first operation of changing the luminance when the illuminance belongs to the first range is accepted from a user, updating the first luminance information to an updated first luminance information in response to the first operation; updating the second luminance information, based on the updated f

Abstract: A display method includes, determining a first target value by correcting a first luminance value representing luminance at a first position in a first image based on a second luminance value representing luminance at a second position in the first image, displaying, by the display apparatus, on the display surface a first corrected image generated by correcting the first image in such a way that a luminance at the first position in the first image becomes the first target value, displaying, by the display apparatus, on the display surface a third corrected image generated by using a changed first target value obtained by changing the first target value based on a second target value based on a fourth luminance value representing luminance at a fourth position in the second image, when the second target value is smaller than the first target value.

Abstract: A display method includes, determining a first target value by correcting a first luminance value representing luminance at a first position in a first image based on a second luminance value representing luminance at a second position in the first image, displaying, by the display apparatus, on the display surface a first corrected image generated by correcting the first image in such a way that a luminance at the first position in the first image becomes the first target value, displaying, by the display apparatus, on the display surface a third corrected image generated by using a changed first target value obtained by changing the first target value based on a second target value based on a fourth luminance value representing luminance at a fourth position in the second image, when the second target value is smaller than the first target value.

Abstract: An illuminator includes a first light source, a second light source, a first lens on which light emitted from the first and second light sources is incident, a second lens disposed in a downstream of the first lens, and a half wave plate. The first lens, the second lens and the half wave plate are arranged along a first axis. The first light source and the second light source are arranged along a plane perpendicular to the first axis. The half wave plate is disposed in the optical axis between the first lens and the second lens, the half wave plate being disposed in a position close to the second lens.

Abstract: A method of controlling a display system including the steps of projecting, by a plurality of group-belonging projectors, an image in one display area corresponding to one projector group to thereby display one composite image corresponding to the one projector group out of a plurality of composite images corresponding one-to-one to a plurality of projector groups in the one display area, estimating, by a control device, brightness of the plurality of composite images, identifying, by the control device, a dark image which is the darkest and a first adjustment target image different from the dark image from the plurality of composite images based on a result of the brightness estimation, and controlling, by the control device, at least one projector in the projector group corresponding to the first adjustment target image to thereby approximate brightness of the first adjustment target image to brightness of the dark image.

Abstract: A method of controlling a display system including the steps of projecting, by one of the first projectors, a first image in one area, projecting, by one of the second projectors, a second image in the one area, estimating, by the control device, brightness of the plurality of first images and brightness of the plurality of second images, identifying, by the control device, a first dark image as the darkest image and a first adjustment target image, and identifying a second dark image as the darkest image and a second adjustment target image, and controlling, by the control device, a projector to thereby approximate the brightness of the first adjustment target image to the brightness of the first dark image, and controlling a projector to thereby approximate the brightness of the second adjustment target image to the brightness of the second dark image.

Abstract: A method of controlling a display system including the steps of projecting, by a plurality of group-belonging projectors, an image in one display area corresponding to one projector group to thereby display one composite image corresponding to the one projector group out of a plurality of composite images corresponding one-to-one to a plurality of projector groups in the one display area, estimating, by a control device, brightness of the plurality of composite images, identifying, by the control device, a dark image which is the darkest and a first adjustment target image different from the dark image from the plurality of composite images based on a result of the brightness estimation, and controlling, by the control device, at least one projector in the projector group corresponding to the first adjustment target image to thereby approximate brightness of the first adjustment target image to brightness of the dark image.

Abstract: A method of controlling a display system including the steps of projecting, by one of the first projectors, a first image in one area, projecting, by one of the second projectors, a second image in the one area, estimating, by the control device, brightness of the plurality of first images and brightness of the plurality of second images, identifying, by the control device, a first dark image as the darkest image and a first adjustment target image, and identifying a second dark image as the darkest image and a second adjustment target image, and controlling, by the control device, a projector to thereby approximate the brightness of the first adjustment target image to the brightness of the first dark image, and controlling a projector to thereby approximate the brightness of the second adjustment target image to the brightness of the second dark image.

Abstract: An illuminator includes a first light source, a second light source, a first lens on which light emitted from the first and second light sources is incident, a second lens disposed in a downstream of the first lens, and a half wave plate. The first lens, the second lens and the half wave plate are arranged along a first axis. The first light source and the second light source are arranged along a plane perpendicular to the first axis. The half wave plate is disposed in the optical axis between the first lens and the second lens, the half wave plate being disposed in a position close to the second lens.

Abstract: A light source device includes: a light emission element; a condensing optical system on which a first component of light emitted from the light emission element is incident; an optical element on which the first component transmitted through the condensing optical system is incident; and a pickup optical system on which the first component having travelled via the optical element is incident. At least one of the condensing optical system and the pickup optical system includes a first lens formed of quartz.

Abstract: An illuminator includes a light source apparatus that outputs first light containing a first polarized light component, an afocal system that includes a first lens and a second lens so arranged that optical axis directions thereof coincide with each other and reduces the light flux diameter of the first light, a polarization adjusting element that converts the first light, while transmitting the first light, into second light containing the first polarized light component and a second polarized light component the polarization direction of which is perpendicular to the polarization direction of the first polarized light component, and a polarization separation element that separates the second light into light formed of the first polarized light component and light formed of the second polarized light component. The polarization adjusting element is located between the first lens and the second lens.

Abstract: An illuminator includes a light source apparatus that outputs first light containing a first polarized light component, an afocal system that includes a first lens and a second lens so arranged that optical axis directions thereof coincide with each other and reduces the light flux diameter of the first light, a polarization adjusting element that converts the first light, while transmitting the first light, into second light containing the first polarized light component and a second polarized light component the polarization direction of which is perpendicular to the polarization direction of the first polarized light component, and a polarization separation element that separates the second light into light formed of the first polarized light component and light formed of the second polarized light component. The polarization adjusting element is located between the first lens and the second lens.

Abstract: A light source device includes: a light emission element; a condensing optical system on which a first component of light emitted from the light emission element is incident; an optical element on which the first component transmitted through the condensing optical system is incident; and a pickup optical system on which the first component having travelled via the optical element is incident. At least one of the condensing optical system and the pickup optical system includes a first lens formed of quartz.

Abstract: An illumination device includes a diffusion element and a light source device that emits a beam bundle including a first unit beam bundle to be incident on the diffusion element along a first direction and a second unit beam bundle to be incident on the diffusion element along a second direction. An angle formed by the first unit beam bundle with an optical axis of the beam bundle is greater than an angle formed by the second unit beam bundle with the optical axis, and the illumination device satisfies I2<I1 where I1 is a luminous flux of the first unit beam bundle, and I2 is a luminous flux of the second unit beam bundle.

Abstract: An illumination device includes a light source device adapted to emit a third light beam including a first component in a first polarization state, a polarization separation element to which the third light beam is input, a retardation element, and a diffusely reflecting element having a concavo-convex structure including a plurality of curved surfaces. The first component having passed through the retardation element via the polarization separation element, is then reflected by the diffusely reflecting element, then passed through the retardation element again, and then enters the polarization separation element. Thus, the fourth component in the second polarization state out of the first component is emitted from the illumination device via the polarization separation element.

Abstract: An illumination device includes a diffusion element and a light source device that emits a beam bundle including a first unit beam bundle to be incident on the diffusion element along a first direction and a second unit beam bundle to be incident on the diffusion element along a second direction. An angle formed by the first unit beam bundle with an optical axis of the beam bundle is greater than an angle formed by the second unit beam bundle with the optical axis, and the illumination device satisfies I2<I1 wheire I1 is a luminous flux of the first unit beam bundle, and I2 is a luminous flux of the second unit beam bundle.

Abstract: An illumination device includes a substrate including a fluorescent layer, and capable of rotating around a predetermined rotary shaft, a light source adapted to emit an excitation light adapted to excite the fluorescent layer, and a control device adapted to control emission of the light source so that, when the substrate is rotating, a first area of the fluorescent layer is irradiated with the excitation light in one round, and at least a part of the first area is not irradiated with the excitation light in another round.

Abstract: A wavelength conversion element includes a phosphor layer that includes phosphors and a binder. The thickness of a phosphor region obtained by multiplying the thickness of the phosphor layer by the volume concentration of the phosphor is equal to or larger than 15 ?m.

Abstract: A wavelength conversion element includes a substrate, and a fluorescent material layer disposed on the substrate. The volume concentration of the fluorescent material in the fluorescent material layer is equal to or higher than 15 vol %.