Using HDMI via Lightning connector with iPad 4

Hi. It's not about the resolution, it's about the aspect ratio. Your iPhone 5s has 640x1136 pixels, ratio of 9:16, same as an HDTV. Your iPad 4 has 1536x2048 pixels, ratio of 3:4. So the iPhone screen can be expanded to fit the TV. The iPad screen can be expanded to fit the TV height, but it will not fill the width without distortion.

When video mirroring, the source of the movie/video is a factor whether or not your iDevice output will fill your wide screen TV screen unless your flat screenTV is a smaller size (less than 42" inch screen ) because iDevice content provider may only allow a certain streaming resolution from the device.

My wife and I have a large flat screen TV and when I use my large iPad Pro as the output device with the Digital HDMI AV adapter, depending on the source of the video/movie, sometimes the movie will play full screen and sometimes only fills approx. 75% of my TV's screen size.

For example, rented or purchased iTunes movies played direct from my iPad or streamed, via iTunes Home Shsring, will play at full wide screen resolution.

Some YouTube and Vimeo videos will play at a smaller size on my TV.

Some are full screen.

Some video apps, like TED and PBS only fill about 75% of the screen.

Some video apps don't output video at all!

I have a Wifi flash drive full of movies.

If I stream those movies from the drive,using the drive maker's access app, they do not fill my TV's screen.

If I transfer a movie from the drive to my iPad ( a process that takes about 15-20 minutes due to the slow WiFi hotspot of the drive), the movie WILL output full screen from the iOS Video app.

So, there are a lot of variables attach to video output from a mobile iDevice.

As far as the iPad's home screens, these are the only screens that output at whatever the native iPad's resolution is.

So, these screens will never expand or stretch to fill an entire wide screen flat screen TV.

This has always been this way for ANY year or model iDevice and will never change.

Hi. You need to check the shape of the screen, ratio of columns to rows. Most, maybe all, iPads are the traditional 4:3 shape, so they fill the screen vertically but not horizontally. They could only fill the screen by distorting the image.

one shape is close to being a square

one shape is a rectangle

for the square to fit the rentable you need to put parts of the square or invent new data to display in the places where the rectangle is wider then the square, if you cut 2 pieces of paper one being 4:3 and one being 16:9 it should be easy to view visually look at this image http://www.kenstone6.net/fcp_homepage/images_faking_it/01_faking_it.jpg

unless you expect your iPad to have 4 units which are just hidden unless connected to a tv then those 4 units would not contain data

likely because it mirror and your ipad is not widescreen but your tv is and your iPhone is