What does the Aspect button control?
The Aspect button allows you to change the shape of the television image depending on the format of the received signal, and your viewing performance. For example, standard analog (4:3) images with black side bars can be stretched to fill your TV’s wide (16:9) aspect. However, high definition signals (720P/1080i) which originated as 4:3 images with side bars and are up-converted by broadcaster to 16:9 can not be changed on some models. The models, including TH-42PD60, TH-37PX60, TH-42PX60, TH-50PX60, TH-58PX60, TH-42PX600, TH-50PX600 and TH-58PX600 employ a new “H-FILL” mode which allows you to change the aspect on high definition signals (720P/1080i).