A light source apparatus includes a light source, an optical element on which light emitted from the light source is incident, and a rotating device that rotates the optical element. The optical element includes a substrate rotated by the rotating device, an optical element layer located on a first surface of the substrate, and a heat dissipater located on the substrate. The heat dissipater has a plurality of fins extending from the side facing the center of rotation of the optical element toward the outer circumference of the optical element and arranged along the rotational direction. Among the plurality of fins, the dimension along the rotational direction between two fins adjacent to each other in the rotational direction is so set as to fall within a predetermined dimension range.

An electronic device comprises a projector that is configured to project an image and a control unit. The control unit is configured to control an orientation of the image to be projected to a first orientation and onto a first surface when the electronic device is in a first attitude, and to control the orientation of the image to be projected to a second orientation different from the first orientation and onto a second surface different from the first surface when the electronic device is in a second attitude different from the first attitude.

A digital light processing projector includes a light machine having a shell. The shell is provided with a first positioning post and a second positioning post. A digital micromirror device is configured with a first positioning hole and a second positioning hole. The first positioning post is located in the first positioning hole. The second positioning post is located in the second positioning hole. The light machine includes a circuit board assembly, a pressing plate, and a first connection assembly for fixed connection with the shell, and fixation of the pressing plate, the circuit board assembly and the digital micromirror device on the shell.

A projection image display device includes: an optical element that separates incident light into a first color light beam and a second color light beam, synthesizes the first color light beam and the second color light beam to generate synthetic light, and emits the synthetic light; a first display panel that reflects and modulates the first color light beam; a second display panel that reflects and modulates the second color light beam; a first heat dissipator that dissipates heat of the first display panel; a second heat dissipator that dissipates heat of the second display panel; a light shielding portion that blocks a part of the second color light beam reflected by the second display panel from traveling toward the first display panel; a light shield heat dissipator that dissipates heat of the light shielding portion; and a container. The second heat dissipator is disposed outside the container.

A display device is provided with a plurality of solid-state light sources (101-103) and a coolant-circulating means (100) that is equipped with a flow path (100a) formed to pass through each of the solid-state light sources (101-103) and that circulates a coolant via the flow path (100a). Each of the solid-state light sources (101-103) has the property that the luminance thereof changes in response to a temperature change. The flow path (100a) is formed such that the coolant first passes through solid-state light sources having a greater degree of luminance change according to the above-described property of the solid-state light sources (101-103).

A light source module of a projector includes a light source having a lamp axis, a fan for providing a cooling airflow, and a flow guide device disposed between the light source and the fan and for guiding the cooling airflow. The flow guide device includes a first air channel connected between a side of the light source and an air outlet of the fan, a second air channel connected between another side of the light source and the air outlet of the fan, and a first airflow control assembly disposed in the first air channel and for controlling the first air channel either in communication or non-communication states via gravity. The first airflow control assembly has a first control rotating shaft inclined relative to the lamp axis and a first included angle between the first control rotating shaft and the lamp axis is less than 90 degrees.

The cooling device of the present disclosure has a thermally conductive base that is thermally connected to a heat-generating section, a heat pipe section embedded in the base, and a fin section that has a plurality of fins and is connected to the base in a way that the fin section covers the heat pipe section.

A liquid crystal display unit includes a liquid crystal display element for modulating light; and a holder part which has a holding portion, at least one connecting portion, an attenuation portion, and a plurality of through-holes. The holding portion holds the liquid crystal display element. The connecting portion is formed integrally with the holding portion, and may be connected to a fixing member for fixing a position of the liquid crystal display element. The attenuation portion is formed in the area from the connecting portion to the holding portion, and attenuates a force transmitting from the connecting portion to the holding portion. The through-holes are formed in the at least one connecting portion. The through-holes include at least one cut-out-through-hole having its part opened. The through-holes allow insertion of connecting members for connection to the fixing member.

An object of the present invention is to improve the efficiency of heat dissipation from a phosphor wheel while suppressing the air resistance and noise of the phosphor wheel during the driving of a light source apparatus. A phosphor wheel (100) according to the present invention includes: a disc-like substrate (120); a phosphor layer (130) formed on the substrate; and a plurality of heat dissipation fins (154a, 154b, and 154c) overlapping with each other when viewed in a direction orthogonal to a surface of the substrate.

A method for controlling a projector controls, via a control circuit, a projector having an input device accepting a startup operation giving an instruction to start up and a stop operation giving an instruction to stop. The method includes: starting startup processing an response to the startup operation and subsequently shifting to a preparation state to preparing for a normal state; setting a task of stop processing in response to the stop operation in the preparation state; and executing the task in response to finishing of the preparation state.