Inspecting a display LCD through the acrylic glass

Hello

I need to inspect a liquid crystal under a sheet of acrylic glass display. The camera and the lighting of the ring are mounted perpendicular to the screen. The problem are the reflections of the acrylic glass plate. P1234 (upper left) shows that. Then I tried a polarisation on the lens filter and could reduce the reflections, only a little, but also myself distortion of acrylic glass (right upper P1234; ignore the sheet on the acrylic glass). The next step was to place a further polarisation on my Flash filter. First of all, I turned the filter on the lens so that I had the best contrast of the screen and transformed subsequently lightning with the second filter so that reflections were minimal. The reflection was still too light for I can't inspect my screen.

Because of the perpendicular frame of lightning, I get thinking. So I tried to keep the lightning to another position and could achieve the best images (P1234 in lower left) but also shadows because the screen is mounted a few millimeters under the acrylic glass. P1234 (bottom right) shows the screen LCD lit on both sides and I think the result is very quiet. Don't you think that a substantive correction could improve this result?  Or should I use another system of lightning (Dome with coaxial Lightning)?

What can offer me my to solve my problem?

Lighting on both sides should give good results, as long as the lights are out on the side far enough.  The image seems good.

Another possibility is to indirect lighting.  Put a large white area broadcasting on location camera, with a hole for the camera to look through.  Bounce light on the white surface to turn on the LCD screen.

Bruce

Tags: NI Hardware

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