I am developing a user interface on a cheap Kinco color LCD HMI unit. After leaving a test UI on the screen for about 3 days, there was a very decided "ghosting" effect.
I was able to eliminate the ghost outlines by alternating a solid black and white screen over the course of about 2 days. Now the screen is back to normal and the ghosted image does not appear.
Since this HMI will be in service for several years with basically the same screens always in use, I want to build a screen-saver which will prevent ghosting. Note that users will view/interact with the HMI very little, as it's in a remote location and may be visited a couple times per week.
In building a screen saver, should the display constantly alternate between solid black and white screens, or is there a specific color which places the least "strain" on an LCD pixel, which would avoid ghosting and ensure pixels remain as bright and color-accurate as possible? For example, is Black considered "full on" or "full off" by the LCD circuitry and pixels? Would a black or white pixel create more prominent ghost image, or is the issue going to appear for any pixel that does not change over a period of time?
I assume either black or white would be the default/resting state of a pixel (i.e. no driver current applied to the RGB subpixel elements) but I don't know which.
At this point I don't know whether alternating between colors is better or worse than filling the screen with a single, unchanging color. I'm looking to implement whichever scheme preserves the pixel brightness/dynamic response and eliminates ghosting.
Note that I did enable the auto backlight-off feature, but even when the backlight is off, the LCD is still displaying the image.
Your recommendations are appreciated.