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Text Too Bright - Backlight POTS to control the Textlight?

Discussion about LCD's and other related hardware

Moderators: _X7JAY7X_, caesar, IFR, mattcro, limbo, Fast351, hydrolisk1792

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unangst
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Joined: May 16th, 2006, 2:33 am
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Text Too Bright - Backlight POTS to control the Textlight?

Post by unangst »

Wiring up went well on my first LCD screen. (HD44780; 4x40)
Thanks to all that have developed LCD Smartie!

Anyways, here's the problem:

The text on the screen is too bright. This brightness makes the screen a bit hard to read. The best way to describe it would be the opposite of 'shadowing'... if line 2 and 4 are blank and the text on line 3 seems to bleed into lines 2 and 4.

I looked at the brightness control here:
http://www.lansley.co.uk/forum/phpBB2/v ... brightness
and decided to use a 10k-ohm micro-size potentiometer (50vdc / 0.1W) from RadioShop. But this only seemed to dim the backlight and not the text.

Anyone have any ideas? Thanks!
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_X7JAY7X_
Hardware Genie - Plugin Author
Posts: 374
Joined: February 16th, 2005, 10:24 pm
Location: Michigan

Post by _X7JAY7X_ »

The top pot in that diagram is for Contrast. The bottom transistor is for the backlight. Did you replace the transistor with a pot?

Did you try turning the contrast pot?

J
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