I’m working on a 7-segment, 0.56 inch tall, LED red display. The display must be readable in sunlight.
I’m looking for ideas to improve the segment brightness.
Should I consider another color of LED display?
What about putting some type of faceplate over the display to improve contrast? I’m thinking about the technique used on very early TI calculators. I don’t know what type of faceplate was used to make their displays visible under high brightness conditions.
What about a high current, low duty cycle drive to the display segments?
A PIC 16F676 multiplexes the three characters. Its limited to a source or sink current of 25 ma per pin. I’m using 220 ohm resisters to limit current from each display segment. Actual current draw is about 20ma on each segment.
Any other ideas?
I’m looking for ideas to improve the segment brightness.
Should I consider another color of LED display?
What about putting some type of faceplate over the display to improve contrast? I’m thinking about the technique used on very early TI calculators. I don’t know what type of faceplate was used to make their displays visible under high brightness conditions.
What about a high current, low duty cycle drive to the display segments?
A PIC 16F676 multiplexes the three characters. Its limited to a source or sink current of 25 ma per pin. I’m using 220 ohm resisters to limit current from each display segment. Actual current draw is about 20ma on each segment.
Any other ideas?