Illumination system and projection apparatus for enhancing uniformity of illumination light beams

A projection apparatus, comprising an illumination system, at least one light valve, and a projection lens, wherein

• the illumination system is configured to provide an illumination light beam, the illumination system comprises a first light source device, a light guide device, a light splitting device, and a light converging element, wherein
• the first light source device is comprises laser sources configured to provide a first light beam, a second light beam, a third light beam, and a first compensation light beam,
• the light guide device is configured to reflect the first light beam, the second light beam, the third light beam, and the first compensation light beam to the light splitting device or the light converging element,
• the light splitting device comprises a first half reflecting element configured to reflect a part of a light beam and configured to allow another part of the light beam to pass through, wherein the light beam comprises at least one of the first light beam, the second light beam, the third light beam, and the first compensation light beam, and
• the light converging element is configured to receive a first combined light beam and a second combined light beam formed by the first light beam, the second light beam, the third light beam, and the first compensation light beam, wherein distances between light spots formed on the light converging element by the first combined light beam and the second combined light beam and a central axis of the light converging element are both identical and greater than zero,
• the at least one light valve is disposed on a transmission path of the illumination light beam and is configured to convert the illumination light beam into an image light beam, and
• the projection lens is disposed on a transmission path of the image light beam and is configured to project the image light beam out of the projection apparatus.