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Hello Expert
The power supply voltage of MSPM0L2228 is 3.3V, so when driving an LCD, it is also a 3.3V LCD. May I ask if it can support a high contrast ratio of 2000:1.
Currently, we have designed 20 segments and 3 MUXS PINs,
1.If it cannot support a contrast of 2000:1, what is the maximum contrast that can be supported.
2. Can we increase contrast by reducing MUXS pins, such as changing to 2 MUXS pins and 30 segments, and what is the maximum contrast that can be achieved?
3.Is there any other way to improve contrast?
Thank you.
BR
Alex Xu
Hi Alex,
I found some descriptions in the TRM manual. The contrast is depends on several aspects.
The contrast is mainly determined by the ratio of (Vrms) on-state / (Vrms) off-state. Typically, when the muxing levels are higher, more voltage levels are used to provide good contrast.
Meanwhile, there is a special mode which could use the register to control contrast:
While, as for the maximum contrast the device could achieve, I need further check whether we have some data for your reference. If not, I think you could start a test with LP.
B.R.
Sal
