20 Hz is based on the fact that 20Hz is an accptable rate for viewing video, although we are used to 25Hz on our tv. For an LED tv - 20Hz should be more than enough.
My appologies Nigel, I never realised that 50Hz was only 25 frames, where I have specifed 20HZ i was meaning 20 Frames per second. Out of curiosity why is this, do we have interlaced frames in the UK
R1A: 91,124,109,111,91,79,88,113,58,52,157,242,64,92,111,95
R1B: 91,124,109,111,91,79,88,113,58,52,157,242,64,92,111,95
G1 : 78,109,95,98,86,73,73,76,64,52,148,227,79,97,105,81
B1 : 87,116,94,89,82,73,78,95,78,62,151,224,118,117,107,72
R2A: 110,153,84,153,114,146,136,146,107,144,255,106,149,142,170,94
R2B: 110,153,84,153,114,146,136,146,107,144,255,106,149,142,170,94
G2 : 128,154,73,136,123,136,118,128,105,126,242,96,143,124,160,98
B2 : 176,175,69,118,162,147,108,108,126,124,232,87,143,112,158,110
For X=0 to 255 (this is the brightness)
For Y=0 to 63 (This is the Rows) (only 16 shown above cos i dont have the time)
load in the colum (y) from the array above
if R1A <= X then OUTPUT_R1A = 1 else OUTPUT_R1A = 0
if R1B <= X then OUTPUT_R1B = 1 else OUTPUT_R1B = 0
if G1 <= X then OUTPUT_G1 = 1 else OUTPUT_G1 = 0
if B1 <= X then OUTPUT_B1 = 1 else OUTPUT_B1 = 0
if R2A <= X then OUTPUT_R2A = 1 else OUTPUT_R2A = 0
if R2B <= X then OUTPUT_R2B = 1 else OUTPUT_R2B = 0
if G2 <= X then OUTPUT_G2 = 1 else OUTPUT_G2 = 0
if B2 <= X then OUTPUT_B2 = 1 else OUTPUT_B2 = 0
clock the latch
next y
delay 65uS (obviously this would be smaller as there is no account for overhead)
next x
R1A: 91,124,109,111,91,79,88,113,58,52,157,242,64,92,111,95
R1B: 91,124,109,111,91,79,88,113,58,52,157,242,64,92,111,95
G1 : 78,109,95,98,86,73,73,76,64,52,148,227,79,97,105,81
B1 : 87,116,94,89,82,73,78,95,78,62,151,224,118,117,107,72
R2A: 110,153,84,153,114,146,136,146,107,144,255,106,149,142,170,94
R2B: 110,153,84,153,114,146,136,146,107,144,255,106,149,142,170,94
G2 : 128,154,73,136,123,136,118,128,105,126,242,96,143,124,160,98
B2 : 176,175,69,118,162,147,108,108,126,124,232,87,143,112,158,110
It can't. As I mentioned earlier, applying a PWM signal to the /OE inputs will allow you to adjust the overall display brightness.How can this be information be applied to the /OE to get the 256 shades per LED?
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