Laser illumination device and projection system using the same

A projection system comprising:

• a laser illumination device, comprising a laser light source, a light combining assembly, a micro-lens assembly, and a plurality of cylindrical lens assemblies, wherein the plurality of cylindrical lens assemblies is provided in an optical path for transmission of the laser light source, and the micro-lens assembly is provided on one side of the light combining assembly, and wherein each of the plurality of cylindrical lens assemblies comprises a first cylindrical lens array and a second cylindrical lens array, and a preset angle of intersection is formed between the first cylindrical lens array and the second cylindrical lens array;
• and wherein the laser light source is configured to achieve grayscale output of the projection system for a corresponding pixel point by adjusting luminance of the laser light source;
• a diffuser provided in an optical path, along which the laser illumination device transmits a laser beam outwards;
• a square rod assembly provided on one side of the diffuser facing away from the laser illumination device;
• a light modulation assembly;
• and
• a light relay assembly provided between the square rod assembly and the light modulation assembly;
• an output assembly provided in an optical path, along which the light modulation assembly transmits a modulated laser beam outwards,
• wherein the light modulation assembly is configured to adjust output luminance of the laser light source corresponding to each pixel point in an image signal, and to control the laser light source to achieve grayscale output of the projection system for a corresponding pixel point by adjusting luminance of the laser light source;
• and
• wherein if a grayscale value of a pixel point having the highest luminance obtained by an algorithm in the image signal obtained by the projection system is A, a maximum value of the luminance of the laser light source corresponding to the pixel point having the highest luminance is Imax, and a grayscale value of a certain pixel point is a, then a luminance Ia of the laser light source corresponding to the certain pixel point is calculated based on a formula of
• I
• a
• =
• I
• max
• ×
• a
• A
• ,
• to achieve projection imaging of the projection system with a high dynamic range.

A laser illumination device for a projection system, comprising:

• a laser light source;
• a light combining assembly;
• a micro-lens assembly;
• and
• a plurality of cylindrical lens assemblies,
• wherein the plurality of cylindrical lens assemblies is provided in an optical path for transmission of the laser light source, and the micro-lens assembly is provided on one side of the light combining assembly,
• wherein each of the plurality of cylindrical lens assemblies comprises a first cylindrical lens array and a second cylindrical lens array, and a preset angle of intersection is formed between the first cylindrical lens array and the second cylindrical lens array,
• wherein the first cylindrical lens array and the second cylindrical lens array are configured to adjust divergence angles of a laser beam from the laser light source which has a spatial distribution in a shape of rectangle, such that divergence angles of the laser beam with respect to a length direction and a width direction of the rectangle are same.

A laser illumination device for a projection system, comprising:

• a laser light source configured to emit at least one laser beam;
• a light combining assembly;
• a micro-lens assembly;
• and
• a plurality of cylindrical lens assemblies,
• wherein each of the at least one laser beam corresponds one of the plurality of cylindrical lens assemblies, the light combining assembly is configured to combine a plurality of laser beams emitted by the plurality of cylindrical lens assemblies, and the combined laser beams are incident to the micro-lens assembly and then is emitted from the laser illumination device;
• h1 is a dimension with respect to a length direction of one of the at least one laser beam, h2 is a dimension with respect to a width direction of the laser beam;
• the plurality of cylindrical lens assemblies is provided in an optical path for transmission of the laser light source, each of the plurality of cylindrical lens assemblies comprises a first cylindrical lens array and a second cylindrical lens array, f1 is a focal length of the first cylindrical lens array, f2 is a focal length of the second cylindrical lens array, and a preset angle of intersection is formed between the first cylindrical lens array and the second cylindrical lens array;
• wherein the first cylindrical lens array, the second cylindrical lens array, and the laser beam satisfy:
• h
• 1
• f
• 1
• =
• h
• 2
• f
• 2
• ,
• to form a uniform matrix light after the laser beam passes through one of the plurality of cylindrical lens assemblies, such that grayscale output of the projection system for a corresponding pixel point is achieved by adjusting luminance of each of the at least one laser light;
• wherein the uniform matrix light has divergence angles of the laser beam in two orthogonal directions and the divergence angles are the same.