with reference to the drawings and in particular to fig2 - 5 , a projector constructed in accordance with the present invention , generally designated with reference numeral 200 , comprises a laser source 2 , a collimate lens 3 , a deflection reflector 4 , a deflection controller 41 coupled to the deflection reflector 4 , and a liquid crystal panel 5 . when the projector 200 is actuated , the laser source 2 emits a laser beam l 2 , which is projected in a predetermined projection direction . the laser beam l 2 has a longitudinal collimated - beam projection range a and a lateral diffused - beam projection range b . in the embodiment illustrated , the longitudinal collimated - beam projection range a of the laser beam l 2 is around 7 to 8 degrees , while the lateral diffused - beam projection range b is around 36 degrees for the laser beam l 2 . the longitudinal collimated - beam projection range a and the lateral diffused - beam projection range b of the laser beam l 2 can be varied in accordance with the requirements of the projector 200 . the laser source 2 is a white laser source in the embodiment illustrated , but can be of other colors in accordance with the applications of the projector 200 . the collimate lens 3 is arranged in the predetermined projection direction where the laser beam l 2 travels from the laser source 2 to convert the laser beam l 2 into a collimated laser beam l 2 ′, which is projected toward the deflection reflector 4 . the deflection reflector 4 is controlled by the deflection controller 41 and is rotatable , with a reference axis 42 as a rotation center , within a predetermined deflection angle range θ . the liquid display panel 5 is arranged adjacent to the deflection reflector 4 and is located in the predetermined deflection angle range θ of the collimated laser beam l 2 ′ projected from the deflection reflector 4 . the liquid display panel 5 has longitudinal and lateral dimensions that are covered by the longitudinal collimated - beam projection range a and the lateral diffused - beam projection range b of the laser beam l 2 emitted from the laser source 2 . when the collimated laser beam l 2 ′ is projected from the collimate lens 3 to the deflection reflector 4 , the collimated laser beam l 2 ′ is deflected by the deflection reflector 4 , within the predetermined deflection angle range θ , in a repeated scanning manner , to the liquid crystal panel 5 , and is filtered by a filter of the liquid crystal panel 5 to produce a specific image on the liquid crystal panel 5 , which image is thus projected to a display screen 6 , so that an observer can see the image projected from the projector 200 by means of visual persistence . as shown in fig6 , which shows a schematic view of optic path of a laser beam generated by laser sources in accordance with a second embodiment of the present invention , a projector in accordance with the present invention , designated with reference numeral 200 a , comprises three laser sources 2 a , 2 b , 2 c , three collimate lenses 3 a , 3 b , 3 c , three reflectors 7 a , 7 b , 7 c , a deflection reflector 4 a , a deflection controller 41 a coupled between the deflection reflector 4 a and a liquid crystal panel 5 a . the laser sources 2 a , 2 b , 2 c generate laser beams l 3 a , l 3 b , l 3 c , respectively , which are projected in predetermined projection directions . the laser beams l 3 a , l 3 b , l 3 c are of the same longitudinal collimated - beam projection range a and lateral diffused - beam projection range b as the laser beam l 2 generated from the laser source 2 . thus , the laser beams l 3 a , l 3 b , l 3 c have a longitudinal collimated - beam projection range a of around 7 - 8 degrees and a lateral diffused - beam projection range b of around 36 degrees . the longitudinal collimated - beam projection range a and the lateral diffused - beam projection beam b of the laser beams l 3 a , l 3 b , l 3 c can be adjusted in accordance with requirements set for the projector 200 a . the laser source 2 a can be a red laser source , the laser source 2 b a green laser source , laser source 2 c a blue laser source . the laser beams l 3 a , l 3 b , l 3 c generated from the laser sources 2 a , 2 b , 2 c can also be changed to other colors in accordance with different applications of the projector 200 a . the collimate lenses 3 a , 3 b , 3 c are arranged in the predetermined projection directions of the laser beams l 3 a , l 3 b , l 3 c from the laser sources 2 a , 2 b , 2 c to respectively convert the laser beams l 3 a , l 3 b , l 3 c into collimated laser beams l 3 a ′, l 3 b ′, l 3 c ′, which are then projected toward the reflectors 7 a , 7 b , 7 c , respectively . the reflector 7 a is a total reflection reflector , which reflects the collimated red laser beam l 3 a ′ from the collimate lens 3 a in a total reflection manner . the reflector 7 b is a semi - reflection reflector , which reflects the collimated green laser beam l 3 b ′ from the collimate lens 3 b in a semi - reflection manner and allows the collimated red laser beam l 3 a ′ that is previously subject to total reflection by the reflector 7 a to transmit therethrough to travel along with the collimated green laser beam 73 b ′ that is subject to semi - reflection by the reflector 7 b . the reflector 7 c is a semi - reflection reflector , which reflects the collimated blue laser beam l 3 c ′ from the collimate lens 3 c in a semi - reflection manner and allows the collimated red laser beam l 3 a ′ that is previously subject to total reflection by the reflector 7 a and the collimated green laser beam l 3 b ′ that is previously subject to total reflection by the reflector 7 b to transmit therethrough to combine with the collimated blue laser beam 73 c ′ that is subject to semi - reflection by the reflector 7 c , thereby forming a combined white laser beam l 3 , which is projected toward the deflection reflector 4 a . the deflection reflector 4 a is controlled by the deflection controller 41 a and is rotatable , with a reference axis 42 a as a rotation center , within a predetermined deflection angle range θ ′. the liquid display panel 5 a is arranged adjacent to the deflection reflector 4 a and is located in the predetermined deflection angle range θ ′ of the collimated laser beam l 3 projected from the deflection reflector 4 a . the liquid display panel 5 a has longitudinal and lateral dimensions that are covered by the longitudinal collimated - beam projection range a and the lateral diffused - beam projection range b of the laser beams l 3 a , l 3 b , l 3 c emitted from the laser sources 2 a , 2 b , 2 c . when the combined white laser beam l 3 that is formed by the light components from the reflectors 7 a , 7 b , 7 c is projected toward the deflection reflector 4 a , the combined laser beam l 3 is deflected by the deflection reflector 4 a , within the predetermined deflection angle range θ ′, in a repeated scanning manner , to the liquid crystal panel 5 a , and is filtered by a filter of the liquid crystal panel 5 a to produce a specific image on the liquid crystal panel 5 a , which image is thus projected to a display screen 6 a , so that an observer can see the image projected from the projector 200 a by means of visual persistence . as shown in fig7 , which shows a schematic view of optic path of a laser beam generated by a laser source in accordance with a third embodiment of the present invention , a projector in accordance with the present invention , generally designated with reference numeral 200 b , comprises a laser source 2 d , a collimate lens 3 d , a deflection reflector 4 b , a deflection controller 41 b coupled to the deflection reflector 4 b , and a digital micro - reflector element 8 . when the projector 200 b is actuated , the laser source 2 d emits a laser beam l 4 , which is projected in a predetermined projection direction . the laser beam l 4 has the same longitudinal collimated - beam projection range a and lateral diffused - beam projection range b as the laser beam l 2 generated from the laser source 2 . thus , the longitudinal collimated - beam projection range a of the laser beam l 4 is around 7 to 8 degrees , while the lateral diffused - beam projection range b of the laser beam l 4 is around 36 degrees . the longitudinal collimated - beam projection range a and the lateral diffused - beam projection range b of the laser beam l 4 can be adjusted in accordance with the requirements set for the projector 200 b . the laser source 2 d is a white laser source in the embodiment illustrated , but can be of other colors in accordance with the applications of the projector 200 b . the collimate lens 3 d is arranged in the predetermined projection direction where the laser beam l 4 travels from the laser source 2 to convert the laser beam l 4 into a collimated laser beam l 4 ′, which is projected toward the deflection reflector 4 b . the deflection reflector 4 b is controlled by the deflection controller 41 b and is rotatable , with a reference axis 42 b as a rotation center , within a predetermined deflection angle range θ ″. the digital micro - reflector element 8 is arranged adjacent to the deflection reflector 4 b and is located in the predetermined deflection angle range θ ″ of the collimated laser beam l 4 ′ projected from the deflection reflector 4 b . the digital micro - reflector element 8 has longitudinal and lateral dimensions that are covered by the collimated - beam projection range a and the diffused - beam projection range b of the laser beam l 4 emitted from the laser source 2 d . when the collimated laser beam l 4 ′ is projected from the collimate lens 3 d to the deflection reflector 4 b , the collimated laser beam l 4 ′ is deflected by the deflection reflector 4 b , within the predetermined deflection angle range θ ″, in a repeated scanning manner , to the digital micro - reflector element 8 so as to produce a specific image by means of the digital micro - reflector element 8 , which image is projected onto a display screen 6 b , whereby an observer can see the image projected from the projector 200 b by means of visual persistence . in the practical applications of the projectors 200 , 200 a , 200 b , the laser sources 2 , 2 a , 2 b , 2 c , 2 d can be ordinary semiconductor laser or carbon dioxide laser . although the present invention has been described with reference to the preferred embodiments thereof , it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims .