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IEC proposed standards
| Parameter | Primary Display | Secondary Display |
|---|---|---|
| Contrast ratio (maximum/minimum luminance) | >100 | >40 |
| Minimum luminance ratio (maximum luminance/ambient luminance) | >100 | >40 |
| Luminance variation | <30% (<20% flat panel) | <35% (<20% flat panel) |
| SMPTE Resolution pattern resolution | All lines clear | All lines clear |
| no diagonals | no diagonals | |
| Contrast balance | 5% and 95% levels clearly seen | 5% and 95% levels clearly seen |
