Glare on my laptop when I use it outdoors

Factual Questions
1

I like to work outdoors but often can’t see my screen hardly at all when I work outdoors, even in the shade. Can anything be done to reduce glare?

2

They sell laptop sun shades, but you could easily make your own out of cardboard and tape.

3

There are also aftermarket screen protectors that can give you a matte layer for more diffuse reflections, or polarized ones that can help block directional light. And portable shade umbrellas that clip onto a table or chair.

I tried all three in combination, but still nothing was quite comfortable enough for when the sun was right overhead on a clear day.

Also check out daylightcomputer.com for a display-based approach to this.