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To regulate the acceptability of defects and to protect the end user, ISO have created a standard for manufacturers to follow. ISO 13406-2 recommends how many defaults are acceptable in a display before it should be replaced, within the terms & conditions of warranty.
All reputable manufacturers conform to and support the ISO 13406-2 standard.
The table below shows the allowable number of malfunctioning pixels that are acceptable, depending on the native resolution of the LCD and allowing for 2 malfunctioning pixels per million pixels.
Native resolution No. of pixels No. of million pixels Acceptable defects
1024 x 768 786,432 0.8 2
1280 x 1024 1,310,720 1.3 3
1600 x 1200 1,920,200 1.9 4
2048 x 1536 3,145,728 3.1 6
The table below shows the allowable number of malfunctioning sub-pixels that are acceptable, depending on the native resolution of the LCD and allowing for 5 malfunctioning sub-pixels per million pixels.
Native resolution No. of pixels No. of million pixels Acceptable defects
1024 x768 786,432 0.8 4
1280 x 1024 1,310,720 1.3 7
1600 x 1200 1,920,200 1.9 10
2048 x 1536 3,145,728 3.1 16
The table below shows the allowable number of malfunctioning sub-pixels that are acceptable within a 5 x 5 block of pixels, depending on the native resolution and allowing for 2 malfunctioning sub-pixels within a 5 x 5 block, per million pixels.
Native resolution No. of pixels No. of million pixels Acceptable defects
1024 x 768 786,432 0.8 2
1280 x 1024 1,310,720 1.3 3
1600 x 1200 1,920,200 1.9 4
2048 x 1536 3,145,728 3.1 6
The above is relevant to Class II LCD panels.