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Overall conclusions (2)

Warm-up time and color stability.
Both Cinema Displays provide consistent color after a warm up period of about 90 minutes. After this period the displays stay within roughly 1.00 Delta-E (CIE94), which is excellent.

Purity.
This describes the displays ability to display the same color at every region of the screen, from top left to bottom right.
While displays that have no issues with this have to be invented yet, High End CRT technology have the capability to actually adjust colors at all regions. This is not possible for LCD at this time.
Therefore, LCD technology will produce bigger color differences between all regions, when compared to the center of the screen.

Purity for the 20" Cinema Display was calculated to an average of 4.4 Delta-E (compared to the center of the screen) and 4.0 Delta-E for the 23HD. As you can see from the graph, purity issues mainly consists of differences in brightness between regions (Delta-L).

Ghosting effect.
When closing a window after it has been opened for some time, it's possible that you can still see some ghosting effect on your Desktop pattern or image. This effect differs from display to display and will most of the time disappear within 1 minute. It seems that both 20" and 23HD displays suffer this problem.