QWIP has nothing to do with field of view for a IR sensor. It is simply a method of generating a brightness scale for a pixel. A pixel in the sensor has a certain number of receptive electrons embedded within energy wells – the more photons that interact with it, the larger fraction of electrons are energized out of the energy wells and into the conduction band, the larger your current pulse, the higher brightness value for the pixel. Simple concept.
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As for the field of view that the Su-57 has in the infrared band, we don’t know. But it most certainly does have some capability for imaging in infrared besides the IRST. The DIRCMs are, after all, a type of dazzler. So, their aim has to be very precise – they have to highlight the seeker, not just any point on the missile. And, just like with a laser sight on a rifle where you know your aim is good because you see the dot reflection from the laser, the Su-57’s protective systems has to see the highlighting provided by the laser beam. And you cannot see the reflection from an infrared beam with a UV sensor.
Now how much capability it has is just guestimates at this time.
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