LCD Displays are made up of a fixed number of pixels. Each pixel is made from 3 sub-pixels: one red, one blue and one green. Each sub pixel has its own transistor, so the manufacturing process to produce a TFT panel is highly complex. Due to this process, defects can occur at any time during the life of the panel. These defects cannot be fixed or replaced.
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 pixel faults are acceptable before a panel can be replaced.
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.
All TFT Monitors sold by Fierce PC fall into Class II
See the details below:
| Class |
a) Pixels always lit |
b) Pixels never lit |
c) Sub-pixel: Always lit; never lit or blinking. |
| I |
0 |
0 |
0 |
| II |
2 |
2 |
5 |
| III |
5 |
15 |
50 |
| IV |
50 |
150 |
500 |
(figures shown represent faulty pixels per million)
| |
H Pixels |
V Pixels |
Total Pixels |
Cat. A |
Cat. B. |
Cat. C. |
| 15" |
1,024 |
768 |
768,432 |
2 |
2 |
4 |
| 17" |
1,280 |
1,024 |
1,310,720 |
3 |
3 |
7 |
| 18" |
1,280 |
1,024 |
1,310,720 |
3 |
3 |
7 |
| 19" |
1,280 |
1,024 |
1,310,720 |
3 |
3 |
7 |
) 
