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Messages - LarryG

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TFTs / NHD-7.0-800480EF-ATXV#-CTP vertical viewing angle
« on: May 10, 2016, 07:57:38 AM »
Puzzled....regardless of content, colors are good when the display is viewed from below (negative vertical angle) but transition to washed out as you change to viewing from above (positive vertical angle).  Horizontal viewing angles appear consistent.

I'm driving the display in High Color (16bit) mode from an STM F469 ARM chip (has a built-in display driver with a 24bit RGB interface).  The display clock is 32Mhz and all other setups (VSync, HBP, etc.) are per your display specification.

I'm driving the backlight from a buck converter with the backlight drive and a DAC output (brightness control) summed together into the converter's feedback port.  I've settled on a backlight drive of 8.8V to provide a satisfactory level of brightness.

Any ideas? 

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TFTs / NHD-7.0-800480EF-ATXV#-CTP power supply
« on: September 24, 2015, 09:08:57 AM »
The display data sheet lists the nominal supply for the CTP as 3.0v with min/max values of 2.8/3.3v.  But the FT5x06 touch controller used is spec'd for 2.8/3.6v.  Why the apparent discrepancy?  Can I power both the TFT and the CTP from a nominal 3.3V?

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