| 摘要 |
An apparatus capable of changing a size of illumination region is disclosed. The apparatus comprises a first optical unit, a second optical unit, a first driving element, and a second driving element. The first optical unit is composed of a first LED and a first optical element. The second optical unit is composed of a second LED and a second optical element. The driving elements selectively provide different driving currents to different LEDs for changing the luminance of the illumination field. A first illumination region can be formed when the first and second driving elements respectively provide the first and second driving currents to the first and second LEDs. A second illumination region can be formed when the first and second driving elements respectively provide the third and fourth driving currents to the first and second LEDs. The first illumination region is different from the second illumination region.
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