depending on your phone Rice may not actually do anything at all.
phones these days are compact tightly designed machines and for rice to work it has to come into contact with the water more or less. the water isn’t able to escape towards the rice so it stays in the device.
first step is to remove the battery and clean the motherboard. isopropyl alcohol should be enough if not much corrosion has occurred. when that’s done based on your description you most likely need to replace the screen assembly. of course it’s also possible the water did permanent damage to the display circuit which would require a specialist to fix.
if you give us the model # of your phone it could help us help you as well
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