A proposal for the low persistance brightness tradeoff
I am a little disappointed how dark the DK2 gets when using low persistance, the tradeoff is obvious... The shorter the light is switched on the less light arrives at the eye (duh).
There is a 'brightness overdrive' on/off functionality in the world demo, which I think increases the current level of the OLEDs beyond their limits if they were always on. So far so good, but it has no effect for me. The display is as
bright as before and about half as bright as using full persistence.
So for the future I propose the following:
In the consumer version, if there really is a custom display controller chip, let it have something I'd call "degenerating persistence"
Instead of modulating the current level of the OLEDs at high frequency always drive the pixels with their maximum safest current. The pixels would the be modulated at the same frequency as the refresh rate. Depending on the sub-pixel brightness they are on at the beginning of the refresh cycle and off after the amount of light has been transmitted until the next cycle.
Ideally that would be some sort of exponential decaying curve which starts at beyond the safest full persistence level and then gets lower very quickly. Ideally the rate of decay would be equal to the standard display gamma function.
Then switch the pixel off after some period dependent on it's respective brightness level. This has the advantage that the display can still reach full brightness but also display low persistence as needed.
There is a 'brightness overdrive' on/off functionality in the world demo, which I think increases the current level of the OLEDs beyond their limits if they were always on. So far so good, but it has no effect for me. The display is as
bright as before and about half as bright as using full persistence.
So for the future I propose the following:
In the consumer version, if there really is a custom display controller chip, let it have something I'd call "degenerating persistence"
Instead of modulating the current level of the OLEDs at high frequency always drive the pixels with their maximum safest current. The pixels would the be modulated at the same frequency as the refresh rate. Depending on the sub-pixel brightness they are on at the beginning of the refresh cycle and off after the amount of light has been transmitted until the next cycle.
Ideally that would be some sort of exponential decaying curve which starts at beyond the safest full persistence level and then gets lower very quickly. Ideally the rate of decay would be equal to the standard display gamma function.
Then switch the pixel off after some period dependent on it's respective brightness level. This has the advantage that the display can still reach full brightness but also display low persistence as needed.
