I have not noticed anything -- but as radiohomebrewer said, a description and photo of the defect you found would be helpful so we know what to look out for. Is it an always-on or always-off pixel? Single pixel, or a group of adjacent ones?
In the early days of TFT displays, specs on the number of permissible pixel defects were common. But I have not seen such specs for quite a while. Is that because I stopped paying attention, or because display manufacturing is generally so well-controlled now that defects are no longer expected?