Display apparatus with color video control signal function

A display apparatus for converting the analog video signals from a host into corresponding digital video data applied to a liquid crystal display (LCD) panel, comprising:

• a microprocessor for generating a video level control signal to control the level of said video data;
• a preamplifier for amplifying said analog video signals according to a given amplification factor control signal;
• an analog-to-digital (A/D) converter for converting the amplified analog video signals output from said preamplifier into corresponding digital video data based on a read clock signal from a read phase locked loop;
• and
• an LCD driver for setting the maximum value of the digital video data based on said video level control signal to deliver said digital video data from said A/D converter to said LCD panel, wherein said LCD driver generates a first amplification factor control signal when the value of said digital video data is greater than the set maximum value, and said microprocessor generates a second amplification factor control signal according to said first amplification factor control signal, said second amplification control factor being applied to said preamplifier to reduce the value of said digital video data from said A/D converter.