Sony PVM-A250 innards [cognitive science research]
Posted: 02 Jan 2015, 09:58
Hi folks,
I work in a cognitive science research lab. We can't tolerate the transition-variable pixel settling times that come from an LCD (i.e. white-to-black can take a few ms, but 25%grey-to-75%grey can take tens of ms), so we have a Sony PVM-A250 OLED monitor. Using a photocell and labjack, I validated that it has fast and consistent transitions. The monitor appears to only offer a 60Hz refresh rate and there is PWM such that, under default operation, the pixels are on for the first 8(ish, will round here-on in) ms, and off for the last 8ms. I say "under default operation" because there is a "flicker-free" mode under which the pixels are on for 4ms, off for 4ms, on again for 4ms (same frame content), and off again for 4ms.
Some of my work does not involve moving images, just sudden appearances and disappearances, and in these cases (to make subsequent mathematical modelling simpler), we'd prefer to have no PWM, leaving the pixels on for the entire refresh. I also wondered if it might be possible to get the display to go to 120Hz (somewhat implied by the display's ability to do a double presentation of the same frame under flicker-free mode), so I contacted Sony to see if any firmware or hardware tweaks might be possible. However, in a subsequent conversation with a product support guy, it was noted that modification of the PWM and implementation of 120Hz was counter to the intent of the display.
With no official support for such modifications, and with pretty much nil expertise on my own to even evaluate whether they are possible, I thought I'd post some shots of the display's innards here in case anyone is interested and can provide input. Here they are: http://imgur.com/6P279L6,hurNawz,3b4RFZY
I work in a cognitive science research lab. We can't tolerate the transition-variable pixel settling times that come from an LCD (i.e. white-to-black can take a few ms, but 25%grey-to-75%grey can take tens of ms), so we have a Sony PVM-A250 OLED monitor. Using a photocell and labjack, I validated that it has fast and consistent transitions. The monitor appears to only offer a 60Hz refresh rate and there is PWM such that, under default operation, the pixels are on for the first 8(ish, will round here-on in) ms, and off for the last 8ms. I say "under default operation" because there is a "flicker-free" mode under which the pixels are on for 4ms, off for 4ms, on again for 4ms (same frame content), and off again for 4ms.
Some of my work does not involve moving images, just sudden appearances and disappearances, and in these cases (to make subsequent mathematical modelling simpler), we'd prefer to have no PWM, leaving the pixels on for the entire refresh. I also wondered if it might be possible to get the display to go to 120Hz (somewhat implied by the display's ability to do a double presentation of the same frame under flicker-free mode), so I contacted Sony to see if any firmware or hardware tweaks might be possible. However, in a subsequent conversation with a product support guy, it was noted that modification of the PWM and implementation of 120Hz was counter to the intent of the display.
With no official support for such modifications, and with pretty much nil expertise on my own to even evaluate whether they are possible, I thought I'd post some shots of the display's innards here in case anyone is interested and can provide input. Here they are: http://imgur.com/6P279L6,hurNawz,3b4RFZY