A 15 inch XGA-Display e.g. consists of 1024 horizontal by 768 vertical picture elements (pixels).

Each individual pixel consists of 3 sub-pixels with one basic color (red, green, blue) each.

That means, the display mentioned consists of a total of 1024 x 768 x 3 = 2 359 296 sub - pixels.

Even the failure of a single transistor (sub-pixel) results in a pixel failure.

Because of the high number of transistors and the subsequent requirements to the glass substrate and the process quality,  pixel failure cannot be excluded. Therefore, the definition below is valid for displays which is derived from class II of ISO 13406-2. If the number of defective pixels lies below the admissible, then there is no "defect" that would be valid for complaint.

The following number of pixel failures are admissible per million pixel:

- A maximum of 5 light or dark sub-pixel

- A maximum of 2 defective pixel (2 or 3 connected defective sub-pixel directly nex to each other)

- A maximum of 2 connected sub-pixels per "cluster" (area of 5 x 5 pixels)

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