Negative bias_diff_off and bias_diff_on values of IMX636. What do they mean?

Negative bias_diff_off and bias_diff_on values of IMX636. What do they mean?

I have set the following biases in the IMX636 Sensor. bias_diff_off = -10 and bias_diff_on = -50. I have read the documentation and would expect to get more OFF events with these settings. However I am getting more ON Events. Why is that? I am still not getting my head around negative bias values. What do they mean and what is going on in the sensor?
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