Some time ago, I ordered a segment LCD on Taobao. The length is 11 cm and the width is about 9 cm. After installing it on the board, and writing the HT1621 driver, I found that the viewing angle of the LCD is too small (custom-made It's 6 o'clock), it can only be seen clearly from the bottom up at 6 o'clock, and it is invisible from the front. And I made the LCD at 6 o'clock in another house, and you can see the characters when you look upright. Has any friend in the group encountered this situation? Give me an opinion, thank you
Mina Posté sur November 25, 2020
1621 If it is fuzzy, it is caused by the wrong bias
You write 1/2 to see the bias register
If you connect the resistor to the 1621 vlcd, short it to vdd to see
Laurel Posté sur November 25, 2020
Treat the actual situation by yourself, my broken code screen is 19SEG, 4COM port
Time slice polling 8MS brush once, once brush 4 SEG, 5 times, 40MS brush finish
SPI frequency 100KHZ, about 500US once
Luciano Posté sur November 25, 2020
Send us the customized parameters
In addition, what is your actual voltage?
You can increase the voltage slightly, better to avoid ghosting
Adele Posté sur November 25, 2020
The problem has been solved, it is the driving voltage problem of the liquid crystal. The original HT1621B manual stated that its VLCD pin needs to be connected to a resistor, about 15K. I did it and measured it with a multimeter. About the voltage on that pin is 4V. This morning, I changed the 15K resistor. Replaced with 100R, the display is basically OK. If it is short-circuited directly, there is no problem. Thank you all.
