Patent ID: 6882331

Claim:
A picture projection system, comprising: a projection screen; a plurality of cells arranged in matrix array serving as light source for projection of picture on said screen, each one of said cells having a light emitting diode (LED) assembly of red LEDs, green LEDs and blue LEDs, programmable control means to control the amount of light transmission from each one of said LED, and merging and focusing means to project the transmitted light onto said projection screen as a pixel, wherein each one of said LED has a top electrode and a bottom electrode, and said LED assembly has: a common metal grid on which the bottom electrodes of all said LEDs make contact with the red LEDs occupying a first row of said grid, the green LEDs occupying a second row of said grid, and the blue LEDs occupying a third row of said grid, a first metal bar in parallel with the first row of said metal grid to which the top electrodes of said red LEDs are wire-bonded, a second metal bar in parallel with the second row of said metal grid to which the top electrodes of said green LEDs are wire-bonded, a third metal bar in parallel with the third row of said metal grid to which the top electrodes of said blue LEDs are wire-bonded, and spaces between said metal bars for cooling air to circulate.