Is there a 4 by 32 character LCD?

[Pommie]

The Hitachi chip that all the cheap character LCD displays are based on can address 128 character locations. This means it can drive a 4 line by 32 column display. Does anyone make such a display? Biggest I've seen is 4x20 and some dual chip displays.

Thanks,

Mike.
Edit, looks like the chip can access a max of 80 characters.

 

[rjenkinsgb]

I don't ever remember seeing one..

4x40 used to be relatively common at one time and those are still available from various makes, but use a different controller, such as this:

https://www.newhavendisplay.com/app_notes/ST7066U.pdf

 

[Pommie]

I've seen 4x40 displays with two Hitachi controllers (and 2 enable pins) but I (wrongly) assumed that as the second line was 64 counts ahead of the first line that the controller could drive 32 characters per line or even 2 lines of 64 characters.

Mike.

 

[Ian Rogers]

What do you need it for.... A Toshiba 240x64 in text mode does 32 x 8 characters

 

[Pommie]

I don't actually need it but am currently writing code for an I²C backpack and wasn't sure if I needed to consider it or not.

Mike.
Edit, how quick is the Toshiba board? The current I²C backpack take around 1mS per character - or 80mS to refresh a 20x4 display.

 

[gophert]

Edit, how quick is the Toshiba board? The current I²C backpack take around 1mS per character - or 80mS to refresh a 20x4 display.

.

 

[Ian Rogers]

So!! Why so fast... I update my display 10 times a second and that's too fast.. Using a pic18f I get a full screen refresh around 75mS wit a 20Mhz crystal.. You can buy a serial backpack for the Toshiba..

GLCD 240x128 Adapter Board - Parallel GLCD interface

Parallel display interface for 240x128 GLCD based on Toshiba T6963C controller. IDC10 header connection with ribbon cable, MIKROE-153

www.mikroe.com

 

[Ian Rogers]

Sorry.. Wrong one

Serial LCD/GLCD Adapter Board - SPI Display Interface

Serial display interface for 128x64 GLCD and LCD 2x16 character. Communication through MCP23S17 16-bit I/O expander. IDC10 header connection, MIKROE-154

www.mikroe.com

 

[Pommie]

I was trying to write a scrolling menu using an I²C LCD and it was just too unresponsive. When you spin a rotary encoder and nothing happens, you realise that 80mS is far too slow. On my 3D printer the rotary encoder is super responsive and that's what I want to imitate. When you have to write two bytes just to toggle the enable pin it just gets too slow.

Mike.

 

[ronsimpson]

4 line by 32 column

Digikey.com has nothing in "32" by X.

 

[Ian Rogers]

If you use a nibble bus and toggle a pin to enable, yes!! Four writes per character... You need the 16bit SPI chip.. Very fast.. especially when you get the SPI up to 10 ~ 12Mhz.. I2C is sill only 400Khz, It'll probably run faster, but still no match for SPI..

 

[gophert]

Are you updating all 80 characters every time or just the characters that need to be changed?