That is TFT screen which divides the screen into small sections of using vertical lines. What i have found so far is that TFT LCDs are made using liquid crystals which are laid in such a way that they form each and every pixel of screen.
If you search for TFT on web you might get some construction information of the screen.
There are 2025 rectangles in a 9x9 grid.
That depends on how big the rectangles are.
96 rectangles.
A grid of cells, typically in a 2D array, can form rectangles on the screen by organizing the cells in rows and columns. The rectangular shape is visualized by the arrangement of cells in a structured grid pattern. Each cell represents a pixel or unit on the screen.
4 rectangles
441
62 x 38 = 2356 rectangles
225
Oh, dude, let me count... Okay, so in a 5 by 6 grid, you've got like 15 horizontal rectangles and 10 vertical rectangles, but don't forget the big one that covers the whole grid, so that's like 26 rectangles total. So, like, yeah, there you go.
There are three varieties of pentagrids. Initial type - 6A7 type (converter). Grid 1 - oscillator grid, Grid 2 - oscillator anode, Grid 3 - screen grid, Grid 4 - signal grid, Grid 5 - screen grid. Development - 6SA7/1R5 type (converter). Grid 1 - oscillator grid, Grid 2 - screen grid, Grid 3 - signal grid, Grid 4 - screen grid, Grid 5 - suppressor grid. Development - 6L7 (mixer). Grid 1 - signal grid, Grid 2 - screen grid, Grid 3 - oscillator injection grid, Grid 4 - screen grid, Grid 5 - suppressor grid.
14
90