Newhaven Display Forum

Newhaven Products => OLEDs => Topic started by: blowtorch on August 12, 2015, 02:39:44 AM

Title: NHD-0420CW-AB3 contrast (brightness)
Post by: blowtorch on August 12, 2015, 02:39:44 AM
Hi

To test various algorithms for a forthcoming product, I have the abovementioned OLED display built into a test rig, standing on my bedside table every night.  To cater for night-time use in a dark room, and daytime use in the sun, we implemented a menu driven contrast adjust setting, over the full range allowed.

Problem is, is that even on lowest setting the screen is too bright and obtrusive at night in a dark room.  How can one gain more control over the level of drive to the OLED to reduce the OLED output? Can it be done in software or hardware?
Title: Re: NHD-0420CW-AB3 contrast (brightness)
Post by: Saurabh_B on August 12, 2015, 09:04:51 AM
Unfortunately if you have it at the lowest setting allowed by the contrast control, there's nothing else you can do to the display.

You can however use a filter or an overlay to dim the screen.
Title: Re: NHD-0420CW-AB3 contrast (brightness)
Post by: Michael_L on August 12, 2015, 10:45:59 AM
A possible alternative could be to switch to the red color version, as it's luminance is not as bright as the blue one.
Title: Re: NHD-0420CW-AB3 contrast (brightness)
Post by: blowtorch on August 14, 2015, 01:00:16 AM
OK thanks.  I was hoping I could do a one off mod, the datasheet for US2066 refers to Iref on page 15 being set by resistor and I seg being a multiple thereof.
Title: Re: NHD-0420CW-AB3 contrast (brightness)
Post by: Michael_L on August 14, 2015, 10:06:51 AM
No problem.  You are free to modify the display as you like, just know any modifications to the board's circuitry will void the warranty.  If you would like us to work with you on a custom design you may feel free to email nhtech@newhavendisplay.com with your inquiry.