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Home » TFT Dead Pixel Allowances
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TFT Dead Pixel Allowances |
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TFT Dead Pixel Allowances
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 Arbico fall into Class II - see the details below.
- Our panel fits ISO13406-2 Spec in Class II
- Class II is the common class for consumer equipment.
- Class I is for Military, Hospital or other Critical applications
- Class II specifies Allowable defect as follows: Allowable missing pixels per million pixels on display.
| 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 |
|
|
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 |
|
(figures shown represent faulty pixels per million)
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