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24 x 24 matrix for LCD

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ELECTRONICIENSENIOR

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Hello,

I am trying to develop a portable ECG for individual useage, with a AD8232.

After a few time with a FSTN 320x200 dsplay without controller then important charge to the cpu without sufficient contrast I have tried a 3"5 TFT 480x320 which I arrive to detect and drive.

I will have to display some labels and numerical data. Since the display is 320x480 for about 53x81mm so pixels are 0,13 x 0,13 mm and for 4mm height characters it takes 3 char in height and 24 char in wight, so 72 bytes per digit, 0 to 9 = 720 bytes, plus a few characters, not possible with a PIC16F1827 without external memory3

My question is if I use a 8x8 matrix for ASCII and tripling pixels in both axis will it be acceptable ? Of course I can try !!

I am searching the best way in terms of speed, and also program memory size, to make the job.

Any ideas
--- Updated ---

Many thanks
 
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Using a 8x8 matrix and doubling it in both directions gives good results as I do it as on my display as a 8x8 matrix is to small, not as good as a true 16x16 matrix but it looks good. I don't know about tripling the 8x8 matrix but I expect that it would be expectable.
 

An intermediate result :
 

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