Gamma correction for adjustable light source
View Patent ↗The present invention provides a projection apparatus comprising: a light source, a light source control unit for controlling the output of the light source; at least one spatial light modulator for modulating the illumination light from the light source by multiple pixel elements; and an optical system for projecting, onto a screen, the illumination light deflected by the spatial light modulator, wherein: the light source control unit 1) modulates the output of the illumination light from the light source during a modulation period of the spatial light modulator, and 2) non-linearly controls the gray scale of an image projected onto the screen.
1. A projection apparatus, comprising:
a light source;
a light source control unit for controlling output of the light source;
at least one spatial light modulator for modulating illumination light from the light source by multiple pixel elements; and
an optical system for projecting, onto a screen, the illumination light deflected by the spatial light modulator, wherein the light source control unit modulates the output of the illumination light from the light source during a modulation period of the spatial light modulator, and non-linearly controls gray scale of an image projected onto the screen.
2. The projection apparatus according to claim 1 , wherein:
the light source control unit modulates output of the illumination light by making the intensity of the illumination light variable.
3. The projection apparatus according to claim 1 , wherein:
the light source control unit modulates output of the illumination light by making the emission interval cycle of the pulse emission of the light source variable.
4. The projection apparatus according to claim 1 , wherein:
the light source control unit modulates output of the illumination light by making the emission interval cycle of that pulse emission of the light source constant and by making the emission pulse time variable.
5. The projection apparatus according to claim 1 , wherein:
the light source control unit modulates output of the illumination light by making the emission interval cycle and the emission pulse time of pulse emission of the light source variable.
6. The projection apparatus according to claim 1 , wherein:
the light source control unit modulates output of the illumination light by making at least one of the emission interval cycles, the emission pulse time, or the emission pulse intensity of pulse emission of the light source variable.
7. The projection apparatus according to claim 1 , wherein:
the light source control unit modulates output of the illumination light by input image data.
8. The projection apparatus according to claim 1 , wherein:
the light source control unit increases the maximum brightness of the light source by making the emission interval cycle of the pulse emission variable within a particular time of one frame, when output of the illumination light is modulated by making the emission interval cycle of the pulse emission of the light source variable.
9. The projection apparatus according to claim 1 , wherein:
the spatial light modulator comprises a micromirror device in which multiple mirror elements for deflecting light from the light source are arranged.
10. The projection apparatus according to claim 1 , wherein:
the light source is a light emitting diode (LED) or a laser device.