New answers tagged lcd
3
That is a contrast pot. Not a brightness pot. And it is a white backlight, with inverse segments. So background should be dark and the pixels white.
So the pot must not be set to maximum brightness, as it means you have zero contrast and you can see it extremely poorly.
When there is something on the screen, adjust the contrast pot so that you have dark ...
-1
You'd implement a block for the low-level parts of the I2C protocol, and a block that schedules the data transfers, and then evolve from there.
I2C has a gated clock and a bidirectional data pin, these are your first steps on the low level block, and both are great learning experiences as well:
The clock isn't very fast, so you can in theory generate the ...
1
Vlcd must not be set to Vdd.
Use the datasheet to calculate how to set Vlcd correctly based on your backplane count and bias requirements.
0
Well in quantity you'll have the TFT glass, but with some thousands of signals to pull out (on a COG, usually). It's simply not feasible to not work at silicon level, how big the connector would need to be?
2
There are a bunch of similar products. Most seem to have a small resistor of several ohms in series with the LED supply to allow operation from 3.3V, and perhaps 4 white LEDs in parallel. You may be able to see the resistor on the back of the PCB.
In any case, a typical recommended current is 60mA. You can probably count on it being less than 100mA. If you ...
3
You are asking a trick question.
The assembled LCD module consists of a display module assembly with a suitable backlight assembly.
The fact that it has a ILI9341 TFT controller has very little to do with the backlight, even though the brightness may be controlled via ILI9341.
The answer to the backlight specs would be in the datasheet of the whole LCD ...
0
Your LED display has nothing to limit its current. But since the 10k base resistor R2 on the driver transistor has a resistance too high then the display will be VERY dim anyway.
2
These displays use a negative supply of something like -25V for the LCD. There is a pot from that supply to Vss (10K or 20K) to adjust the contrast. Typically Vdd-Vo is 23V at 25°C so the voltage at the pot wiper would be about -18V. The pot is used to adjust the contrast to compensate for variations from glass to glass variations and with temperature and ...
2
It is extremely rare to find aftermarket replacements for custom LCDs.
I have found ones for a specific model of marine navigation equipment, at over $50 each LCD. I'm not sure if they were ex-factory, or somebody thought it was worthwhile to reverse-engineer and pay to have a batch made up for all the Autohelm users out there.
For anything else your only ...
3
It's 99.8% for sure a custom display with that smiley face, so any replacement would almost surely have to come from a cannibalized unit or from the manufacturer (not likely).
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