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Abstract:
In addition to being intrinsically photosensitive themselves, the melanopsin containing intrinsically
photosensitive Retinal Ganglion Cells also receive input from rod and cone pathways, making it
difficult to assess the contributions of melanopsin to vision in humans in vivo (Dacey et al., 2005).
Display systems with at least four controllable primaries enable melanopsin function to be studied
using melanopsin-isolating stimuli produced via the method of silent substitution (Spitschan &
Woelders, 2018). We present a novel multiprimary high dynamic range (MPHDR) display that is
suitable for such experiments and discuss how to use it to study the roles of melanopsin in
perception and pupil control. Our display is the first system, to our knowledge, that allows the
delivery of spatially controllable, high dynamic range, multiple primary stimuli. The MPHDR
display can reach a maximum luminance of 3,200 cd/m2, has a colour gamut 46% wider than
sRGB displays, and uses a five independent parameter system to control six effective primaries.
Using the MPHDR display we can produce melanopsin stimuli with an available melanopsin con-
trast of 23% at 2,000 cd/m2 up to a maximum contrast of 117% at 75 cd/m2. We discuss using our
display to further investigate the influence of melanopsin on pupil control. The display allows us
to probe the influence of melanopsin on pupil control over a range of luminance levels from
75 cd/m2 to 2,000 cd/m2, something that has been previously inaccessible.
