LCD crosstalk

LCD crosstalk is a visual defect in an LCD screen which occurs because of interference between adjacent pixels.

Owing to the way rows and columns in the display are addressed, and charge is pushed around, the data on one part of the display has the potential to influence what is displayed elsewhere.[1] This is generally known as cross-talk, and in matrix displays typically occurs in the horizontal and vertical directions. Cross-talk used to be a serious problem in the old passive-matrix (STN) displays, but is rarely discernable in modern active-matrix (TFT) displays.

A fortunate side-effect of inversion (see above) is that, for most display material, what little cross-talk there is largely cancelled out. For most practical purposes, the level of crosstalk in modern LCDs is negligible.

Certain patterns, particularly those involving fine dots, can interact with the inversion and reveal visible cross-talk. If you try moving a small Window in front of the inversion pattern (above) which makes your screen flicker the most, you may well see cross-talk in the surrounding pattern.

Different patterns are required to reveal cross-talk on different displays (depending on their inversion scheme).

References
  1. P. M. Alt, P. Pleshko Scanning limitations of liquid-crystal displays, IEEE Trans. Electron Devices, vol. ED-21, pp. 146–155, Feb. 1974.


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