Liquid crystal display controller and liquid crystal display device

A liquid crystal display system comprising:

• a liquid display panel which has a plurality of first lines provided in a first direction and a plurality of second lines provided in a second direction different from the first direction;
• a liquid crystal display controller which is mounted with a TCP (tape carrier package), which is coupled to the liquid display panel and which drives the liquid display panel, the liquid crystal display controller being enabled to set up a partial display area on the display panel by controlling a driving of ones of the plurality of first lines, the liquid crystal display controller comprising:
• an interface circuit which is coupled to receive signals provided from an outside of the liquid crystal display controller;
• a display RAM which is coupled to the interface circuit and which stores display data to be displayed on the liquid display panel;
• an address counter providing addresses of the display RAM;
• a timing generation circuit;
• a first driver which is coupled to the timing generation circuit and which provides signals for driving the plurality of the first lines;
• a second driver which provides signals to drive the plurality of second lines in accordance with the display data read out from the display RAM;
• and
• a display position setting register which is coupled to the interface circuit, which is capable of being rewritten to data from the outside of the liquid crystal display controller via the interface circuit and which designates a position of the partial display area on the display panel when data is set therein,
• wherein the first driver provides signals to drive ones of the plurality of first lines which are designated by the display position setting register when the data is set in the display position setting register.