of lcds in a computer system according to the present invention as shown in fig1 after a process starts if the lcd 101 is equipped the eedid interface 102 checks the identification information of the corresponding lcd 101 and provides the checked identification information to the system bios 100 step s 111 afterwards if the brightness increasing or decreasing command is inputted by a user the system bios 100 accepts the command preferably through an interrupt at this time the system bios 100 retrieves such an lcd identification information inputted from the eedid interface 102 e g shown in fig3 and the brightness control values according to the kinds of the lcds that are stored in advance step s 112 thereafter the system bios 100 generates a corresponding brightness control command based on the retrieved lcd identification information and brightness control value to control the inverter thus the brightness of the lcd e g lcd 101 can be controlled step s 113 as described above preferred embodiments of a system and apparatus for driving a plurality of lcds in a computer system have various advantages preferred embodiments of a system and apparatus for driving a plurality of lcds can control brightness of a various kinds of lcds at different levels by a single inverter based on brightness control information of the usable lcds or a specific lcd and correction coefficients thereof accordingly brightness levels of the lcds are evenly controlled as a result preferred embodiments provide portable computer systems with power saving effect reduce developing costs increase productivity and reduce costs of after services further preferred embodiments of apparatus and methods for driving displays according to the invention can be applied to electronic devices provided with a display in particular pdps cellular phones or the like the.