CUSTOM SEGMENT LCD

[Fourier15]

Hello folks ,

I have an custom segment lcd manufactured from china .Consisting of 59 segment pins and 4 common pins with 1:4 Multiplexed .I have choosed HOLTEK HT1621B to drive my lcd .but the issue is lcd driver contains only 32 segment pins whereas my lcd consist of 59 segment pins ..so can i use two LCD DRIVER  to drive my single lcd or i have to use another LCD DRIVER consisting of 64 segment pins like Holtek HT1625 ..

Kindly suggest the solution .

Thank You

[Terry Bites]

got any spare io pins on your uC?

[jpanhalt]

Don't know the details of your LCD driver, but it is not uncommon to have an LCD screen divided between 2 (or more) drivers.  One common configuration is to divide the screen vertically.  Then select CS1 (pad1 of your controller) for one half and CS2 for the other half (each is active low) when writing to the screen.  That method does require an extra MCU pin.

Holtec also makes a 64-segment controller (HT1625), which might be easier to use.  See dytasheet at DigiKey (or anywhere else).

[wraper]

Don't know the details of your LCD driver, but it is not uncommon to have an LCD screen divided between 2 (or more) drivers.  One common configuration is to divide the screen vertically.  Then select CS1 (pad1 of your controller) for one half and CS2 for the other half (each is active low) when writing to the screen.  That method does require an extra MCU pin.

But how are you supposed to share 4 common pins between the two HT1621 drivers? Unless LCD is designed with 2 completely independent halves, or driver IC supporting stacking up, I don't see this happening.

[jpanhalt]

Perhaps the TS can respond and give a little more information.  At a minimum, a link to the LCD datasheet would be helpful.

Do you have any constructive suggestions for the TS?