Startup Idea : FlashWave - Spectator-powered Giant Stadium Screen

Nowadays spectators in stadiums are using their phone flash light to do this https://www.youtube.com/watch?v=2wWTD2WuN8g https://www.youtube.com/watch?v=hzfHmcDq_cg My idea is to co-ordinate the phone flashes and turn the entire stadium seating area into a giant screen or marquee - a digital mexican wave. So that messages can be displayed like this: https://youtu.be/HE_Jn2N3ty0?t=52s The app will determine a phone's location in the stadium using GPS and assign it a fixed position like a pixel in a screen. People will face the screen of the phone while the flash faces towards the ground. At any time 3 suggestions can be shown on the screen. For example let's take a Cricket match, three marquee message options would be 1) India India 2) KOHLI 3) SIX. People can press the buttons and crowd vote in real time and whichever option gets the most votes will be displayed. Users can even type in suggestions and whichever suggestion gets most votes will become part of the 3 options.