Author Topic: NHD-7.0-HDMI-N-RSXV-CTU not reporting correct resolution to operating system  (Read 796 times)

sneal

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The NHD-7.0-HDMI-N-RSXV-CTU LCD display module has a stated resolution of 800 X 480, but the module reports a resolution of 1024 X 768 to the operating system (i.e. Windows 10 reports 1024 X 768 as the "native" resolution of the panel).

When connected to a PC running Windows 10, this results in the lower and right sides of the desktop being cut off and the touch screen basically useless as all touches do not map to the physical screen. I was able to correct this by setting a custom screen resolution of 800 X 480.

I am also testing this display with Android and Windows 10 IoT Core.

In both cases, the operating system will NOT allow me to change the resolution to the correct 800 X 480.

I am able to compensate for the screen by setting the size of my application to 800 X 480 (with no scaling) which results in an application that fits exactly on the screen.

The touch screen in this case is still useless as the touches still appear to be mapped to a different display size and thus do not correspond to objects on the screen.

The two options to correct this issue are to (A) get the display to report the correct resolution via HDMI,  or (B) re-calibrate the touch controller to map to the usable area of the display.

While (B), recalibrate the touch controller seems the most practical, I am not sure how (B) can be done on this display. This model is a capacitive touch model which appears to use a PIC18LF2550 as a touch controller. There are calibration utilities for the resistive touch model using an AR1100 controller, but I cannot find a corresponding utility for the capacitive touch model.

Please advise on how to correct this issue.
« Last Edit: May 29, 2018, 04:41:47 PM by sneal »

 

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