Step 1. Creat a new image and fill it with black colour, then create a new layer and fill it with white colour, then put the black in the front of white. Apply the filter Filter/ Texture/ Grain with the following data: Intenset 100 ; constrast 60 ; Grain Type:Vertical.

Step 2. Then apply another filter Filter/ Artistic/ Neon Glow with the following data: Glow Size 5 ; Glow Brightness 17 ; Glow Color #30c14c

Step 3.  And the last filter you have to apply is Filter/ Stylize/ Glowing Edges with settings: Edge Width 1; Edge Brightness 8 ; Edge Smoothness 1. You can delete the top edges to reach the most analogous effect. And notice that as the image is bigger as you get the real Matrix.