Liquid crystal projection color display apparatus having microlens arrays with controllable refractive power

Claim 2

A projection color display apparatus for imaging a color image comprising: a light source means for outputting three primary color light beams of red, green and blue as approximately parallel light beams; three liquid crystal display device means each for passing a corresponding one of said three primary color light beams so as to thereby form an optical image in accordance with an image signal; and projection lens means for projecting said optical image on a screen; said three liquid crystal display device means each including a liquid crystal display panel having a plurality of pixels arranged in a matrix, a microlens array arranged on the light-source side of said liquid crystal display panel and having a plurality of microlenses formed in a matrix and a refractive power which is controllable by an application of an electric field, and an electric field application means for applying a predetermined electric field in accordance with said corresponding one of said three primary color light beams to said microlens array so as to thereby make each of said plurality of microlenses have a predetermined refractive power; wherein said predetermined electric field is applied simultaneously with said corresponding one of said three light beams.

Claim 3

A projection color display apparatus as claimed in claim 1, wherein said electric field application means comprises first and second transparent electrodes respectively formed on two surfaces of said microlens array, and a voltage application means for applying a voltage between said first and second transparent electrodes.

Claim 4

A projection color display apparatus for imaging a color image comprising: a light source means for outputting three primary color light beams of red, green and blue as approximately parallel light beams; three liquid crystal display device means each for passing a corresponding one of said three primary color light beams so as to thereby form an optical image in accordance with an image signal; and projection lens means for projecting said optical image on a screen; said three liquid crystal display device means each including a liquid crystal display panel having a plurality of pixels arranged in a matrix, a first microlens array and a second microlens array respectively disposed on the light-source side and the screen side of said liquid crystal panel and having a plurality of microlenses formed in a matrix and having a refractive powers which are controllable by an application of an electric field, and an electric field application means for applying a predetermined electric field in accordance with said corresponding one of said three primary color light beams to each of said first and second microlens arrays so as to thereby make each of said plurality of microlenses have a predetermined refractive power, thus being capable of outputting approximately parallel light from said predetermined second microlens array; wherein said electrical field is applied simultaneously with said corresponding one of said three light beams.

Claim 5

A projection color display apparatus for imaging a color image comprising: a light source means for outputting three primary color light beams of red, green and blue as approximately parallel light beams; three liquid crystal display device means each for passing a corresponding one of said three primary color light beams so as to thereby form an optical image in accordance with an image signal; and projection lens means for projecting said optical image on a screen; said three liquid crystal display device means each including a liquid crystal display panel having a plurality of pixels arranged in a matrix, a first microlens array and a second microlens array respectively disposed on the light-source side and the screen side of said liquid crystal panel and having a plurality of microlenses formed in a matrix and having a refractive powers which are controllable by an application of an electric field, and an electric field application means for applying a predetermined electric field in accordance with said corresponding one of said three primary color light beams to each of said first and second microlens arrays so as to thereby make each of said plurality of microlenses have a predetermined refractive power, thus being capable of outputting approximately parallel light from said predetermined second microlens array; wherein said electrical field is applied simultaneously with said corresponding one of said three light beams.

Claim 6

A projection color display apparatus as claimed in claim 3, wherein said electric field application means comprises first and second transparent electrodes respectively formed on two surfaces of each of said first and second microlens array, and a voltage application means for applying a voltage between said first and second transparent electrodes.