A data packet parser, for determining packet format, is substantially software controlled, to readily accommodate new or different formats, without the need for using a microprocessor for parsing. An evaluating unit monitors the coefficients of the HL, LH, HH sub-bands generated by the wavelet transformer and checks the number of the high frequency components in the original image. The white light LW that has entered the liquid crystal panel 10 is modulated according to the alignment of the liquid crystal material and passes through the color filters of the counter substrate.