I've found out that it uses the MBI5025 driver ic for the column data and the 74HC4094 ic for the row data. Is the current constant for each row?
If for example there's constant current 50mA for each row, then I think the brightness of using 50mA to light up 10 dots on a row, won't be the same with the brightness of using 50mA to light up 30 dots on a row. Am I right?
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I don't think it's firmware problem. Because when there is less dot to turn on, the dots will be brighter. When there is more dot to turn on, the dots will be dimmer. Am I right?