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Adaptive Simultaneous Display with Single CRTC for Notebook PC which has Non standard resolution of LCD display Disclosure Number: IPCOM000013386D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-18

Publishing Venue



With Notebook PC, Graphic accelerator(hereafter video chip) is going to support so called "multi monitor" with dual CRTC in it. This means to support same desktop image on both internal LCD and external CRT with different resresh rate, e.g. XGA with 60Hz on LCD and 85Hz on CRT. Simultaneous display on internal LCD and external CRT can be supported with single CRTC as well, however, in this case, same refresh rate, e.g. 60Hz. on both displays. We have decided to pick up 1400x1050 dot TFT LCD(hereafter SXGA+ LCD) as integrated LCD for 1Q/2000 new ThinkPad. The above dual CRTC has another merit for supporting such as NON VESA standard resolution LCD.