Any process that activates or increases the frequency, rate or extent of photoreceptor cell differentiation. An example of this process is found in Drosophila melanogaster.
Synonyms:
exact_synonym:
positive regulation of photoreceptor differentiation; up regulation of photoreceptor cell differentiation; up regulation of photoreceptor differentiation; upregulation of photoreceptor cell differentiation; upregulation of photoreceptor differentiation
narrow_synonym:
activation of photoreceptor cell differentiation; activation of photoreceptor differentiation; stimulation of photoreceptor cell differentiation; stimulation of photoreceptor differentiation