US 11,143,944 B2Granted

Projection device and calibration method thereof

AssigneeCoretronic Corporation

InventorsChing-Feng Hsieh, Chih-Chen Chen, Hui-Chung Hung

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Abstract

A projection device includes a light source, an optical engine and a controller. The light source provides a light beam according to a setting current. The optical engine includes a light combining module, an imaging module and a projection lens. The light combining module receives the light beam to generate an illumination beam. The imaging module includes a prism, a digital micromirror device and a light sensor. The prism transmits a portion of the illumination beam to the light sensor. The digital micromirror device converts the other portion of the illumination light beam into an image beam. The light sensor disposed between the prism and the digital micromirror device receives the portion of the illumination beam to generate a brightness data. The projection lens projects the image beam. The controller dynamically adjusts the setting current to calibrate a color point of the light beam according to the brightness data.

Claims16

Dependent claims

A projection device, comprising:

a light source, configured to provide a light beam according to a setting current;
an optical engine, configured to receive the light beam, comprising a light combining module, an imaging module and a projection lens, wherein
the light combining module is configured to receive the light beam and generate an illumination beam,
the imaging module comprises:
a prism, a digital micromirror device and a light sensor, wherein the prism is configured to receive the illumination beam and transmit a portion of the illumination beam to the light sensor, the digital micromirror device is configured to receive the other portion of the illumination beam transmitted from the prism and convert the other portion of the illumination light beam into an image beam, and the light sensor is disposed between the prism and the digital micromirror device, and the light sensor receives the portion of the illumination beam transmitted from the prism to generate a brightness data, and
the projection lens is configured to receive the image beam transmitted from the digital micromirror device and project the image beam out of the projection device to form an image, and
a controller, coupled to the light sensor and the light source, and configured to receive the brightness data, wherein the controller compares the brightness data from the light sensor with a predetermined value to determine the setting current, and provides the setting current to the light source, so as to dynamically adjust the setting current to calibrate a color point generated by the light beam emitted from the light source according to the brightness data.

4 more elements

A calibration method, adapted for a projection device, wherein the projection device comprises a light source, an optical engine and a controller, wherein the light source is configured to provide a light beam, the optical engine is configured to receive the light beam and comprises a light combining module, an imaging module and a projection lens, wherein light combining module receives the light beam and generates an illumination beam, the imaging module comprises a prism, a digital micromirror device and a light sensor, and the prism is configured to receive the illumination beam, the calibration method comprising:

providing the light beam emitted from the light source according to a setting current;
transmitting a portion of the illumination beam through the prism to the light sensor, and transmitting the other portion of the illumination beam through the prism to the digital micromirror device;
sensing the portion of the illumination beam by the light sensor to generate a brightness data, wherein the light sensor is disposed between the prism and the digital micromirror device;
and
comparing the brightness data from the light sensor with a predetermined value to determine the setting current, and provides the setting current to the light source, so as to dynamically adjust the setting current to calibrate a color point generated by the light beam emitted from light source by the controller according to the brightness data.

2 more elements

Dependencies are inferred from the claim text.