How to set the parameters of Canon 70D SLR when there is a large screen in the indoor venue background?

There is a big LED screen at the scene, which is reflected in the camera, which is the difference of metering. If the screen content is the main shooting content, it is necessary to use the screen to measure light (including focusing, of course). If you are shooting a character, you should use the face of the character to measure the light. If you want to take care of both, it is best to use auxiliary lights to fill the light.