Illuminating system gives attention to the transmission efficiency and spatial uniformity. Various non-imaging
components were used as the illuminating system for the projection system to collect the light emitted by Light-Emitting
Diodes, such as light pipe, CPC and flyeyes lens. For the micro projection, the key is to find a useful method to keep the
system compact which causes little loss of the efficiency and spatial uniformity. Kohler illumination is an efficient
method to get the uniformity lighting zone on the pupil plane of the optical system. According to the principle of the
Kohler illumination, in this paper, we proposed to set the stop on the LCoS front surface for the first time. It can be
found that this method can give satisfied results by using two simple lens. In order to get the white light from the R, G, B
LEDs, the color matching method by using the actual measurement chromaticity coordinate is also given. Simulation
results show that both the solutions can give efficient illumination and the system with aspherical lens can give more
uniformity.
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