How do you make a computer monitor on minecraft?

Answer 1

If you want to make one out of redstone and pistons, It will need to be stackable vertically and horizontally so adding in more will not be a problem and will make things much more simple. The smallest pixel (small dot that is controlled independantly) size that can be made to stack is 2x2.

1.) Start by making horizontal rows of blocks stacked on top of each other with a one block gap above each row. Note: the rows need to be an even number of blocks long.

2.) on the long side of each row, put a line of sticky pistons facing out

3.) put sticky pistons facing the same way on top of every sticky piston you just placed. Note, it should look like a wall of sticky pistons.

4.) put your choice of block for the front of the screen on the sticky side of each of the sticky pistons.

5.) now, on the opposite side of the pistons, on the horizontal rows, place redstone repeaters facing the pistons on top of each of the blocks in your horizontal rows.

6.) add a second layer of horizontal rows directly behind the first layer

7.) from left to right, on top of the blocks you just placed, put alternating redstone and repeaters (redstone, than repeater, than redstone, etc...)

8.) add another layer of horizontal rows like in step six

9.) repeat step seven, except put two redstone, than two repeaters

10.) add another row of repeater, nothing, redstone, redstone

11.) add a final layer of redstone, nothing, redstone, nothing

Each of the redstone from step 11 will power an individual pixel in the screen.

If you were looking for a color screen, there isn't a way to do that yet, although I have seen one version where they used redstone to open certain doors and letting you see colored wool inside.