Patent ID: 8319738

Claim:
A touchscreen module comprising: a display for presenting information to a user of the touchscreen module; a touch panel mounted in overlapping relationship with the display; a touch panel controller coupled to the touch panel for detecting a point on the touch panel touched by the user; and a display controller coupled to the display and comprising a display driver; wherein the display controller further comprises a 256-byte EEPROM, the EEPROM having a first memory portion in the lower 128 bytes and a second memory portion in the upper 128 bytes, wherein the EEPROM complies with the Extended Display Identification Data data structure, wherein the first memory portion is adapted to store display information related to said display, including display resolution information, wherein the second memory portion is adapted to store calibration information related to said touch panel, wherein the first memory portion comprises an extension flag set to zero indicating that the second memory portion contains no display information, and wherein the display driver is adapted to read the extension flag and ignore the information contained in the second memory portion if the extension flag is set to zero.