Can I change the contrast of just some characters from a LCD display?

Other Hardware Displays
1

Hello, I got this LCD display that shows the word "WELCOME". I was wondering if there's any way I can change the contrast of "COME" only, and have WEL stay at 100%. The idea is to have COME go from 100 to 0% opacity while WEL stays at 100%.

2

Which one?

3

Sorry, it's the one from Nokia 5110

4

No, there is no individual pixel constrast control.

5

Thanks, is that an Arduino or a LCD limitation? In case it's a display's, do you need if e-ink or OLED have that limitation as well? thanks.

6

LCD limitation

Study display data sheets and libraries before you buy. To have full control over a pixel, you need a display with many bits per pixel. 16 is a good number.

1 Like
7

I don't suppose there is any point in asking what display it is, the answer is an emphatic "no" but, after you have seriously considered just how good an idea this is, you might get something near to what you want by flashing the characters c, o, m, e, at a varying speed.

1 Like
8

Also check the libraries available for use with whatever display that you settle on. For instance, the Adafruit GFX library that is used with many display libraries allows use of different fonts. Perhaps a font will have a regular and bold version that can be mixed to get the effect that you want. Or different text sizes.

1 Like
9

Normally ... No.

But ...

If you can control an individual character or set of characters on the display by displaying a empty space and the character ( on / off ) so your eyes will see a difference, than it maybe possible.
In order to do that, you have to place a character in the memory location of the display, ( H ) and replace with and empty space ( space bar ) at the same memory location of the " H " and in between a small delay. Using libraries may not work, but using without libraries and control the data directly may work. For a test, you may use the common LCD module https://www.waveshare.com/datasheet/LCD_en_PDF/LCD1602.pdf and check the HD44780 https://www.sparkfun.com/datasheets/LCD/HD44780.pdf

So check it out. It may be worth a try.

10

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.