Kevin, Kevin, Kevin,.....you should have posted your problem here first.
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.
A Backlight can be a CCFL, or a series of LED lights.
In regards to the Acer Aspire 7720 series of Notebook PC's, the Backlight is a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Approximately 2mm Wide, by close to the height of the LCD screen, Tall )
A screen Inverter is used to convert the power (Electricity) of the laptop, for the Backlight, and LCD screen.http://www.cdsparts.com/p-97-new-acer-aspire-7720-7720g-7720z-7720zg-series-lcd-inverter.aspx
90 PERCENT OF THE TIME THE FAULT IS THE INVERTER.
The thin plastic frame in front of the LCD screen, (Resembles a picture frame), is the Display Bezel.
The screen Inverter is mounted towards the bottom of the LCD screen, and behind the Display Bezel.
This you already know. Posting for those who read this solution in the future.
Service Manual (Free),http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-acer
For additional questions please post in a Comment.