Reflections and viewing angle can make illuminated segments difficult to see. That is different from confirming that the appliance has no power.
What the observation means
Do not lean over hot pans or touch the surface to investigate. A photograph can also misrepresent a segmented display because of exposure or timing.
A useful next step
Read the display from a safe normal position and check the owner's guidance. If it remains unreadable or loses segments, report that limitation. Do not continue cooking by guessing settings or assume a dark-looking screen proves the zones are cold.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.