IBM T220/T221 LCD monitors

The IBM T220 and T221 are LCD monitors that were sold between 2001 and 2005, with a native resolution of 3840×2400 pixels (WQUXGA) on a screen with a diagonal of 22.2 inches (564 mm).

[citation needed] The supported maximum refresh rates, at native resolution, depend on how many TMDS links are used.

[4] The 9503-DG5/DGP/DGM model had a native refresh rate of 48 Hz and did not come with a graphics card but included an external converter box that receives a dual-link DVI signal, re-synchronizes, buffers, and splits it into two single-link signals - one carrying odd pixels plus sync, and the other even pixels plus sync.

A third party connector adapter, previously available in Japan, buffers and splits only the TMDS sync signal.

Internal dual-link retrofits included an unbuffered hardwire jumper-split of the TMDS sync signal which resulted in impedance mismatch, and an unbuffered hardwire split of the TMDS sync signal with a 24 Ohm series resistor on each leg.

When the converter box is used in parallel with a third single-link DVI input, a refresh rate of 48 Hz can be achieved.

Alternatively, two converter boxes can be used simultaneously with two dual-link DVI ports to drive the DG5 as two 1920×2400 stripes at 48 Hz.

[5] The uncommon resolution, connection and screen splitting may require custom settings for systems not officially supported.

On 10 November 2000, IBM announced the shipment of the prototype monitors to U.S. Department of Energy's Lawrence Livermore National Laboratory in California.

IBM and Chi Mei Group of Taiwan formed a joint venture called IDTech[6][7] in 2001 to manufacture the T221 in Japan.

The production line of IDTech at Yasu Technologies was sold to Sony in 2005[10] and the fate of the T221 is unclear.