Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Enclosure for blind display

Enclosure for blind display

Enclosure for blind display


Context - The produuct that I am working on currently requires a blind display. They have LEDs on the back side with stencil on top of it, that creates graphics and projects them on to the white plastic. The display is visible only when the unit is turned ON. Else, it is a plain white plastic top cover.
Here are some example images.

Most commonly these are seen in Air conditioning units.
My question - What type of platic can we use for this top layer (ABS, PP, PMMA or other)? Will painting the part make it opaque to LED lights?

RE: Enclosure for blind display

Your writing doesn't make it clear to me whether the examples are painted/stenciled on the inside or the outside.

That aside the effect is optical so it doesn't care what material you use, it just has to be properly opaque to make the effect work.

I believe many different plastics would fit that requirement which is good. Select the plastic for other mechanical and cost reasons.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Enclosure for blind display

Hina Shah,

Your part will not work unless it is translucent. You can use translucent paint, possibly on a transparent part.

After this, you need to ask practical questions.
  1. Does your part need to be resistant to ultra-violet light? Many if not most plastics are not. Lots of paints aren't, either.
  2. How subject is your surface to wear? If you require a rough surface finish, you must assume it will not stay that way. Paint wears off eventually, which is bad if it is functionally critical.
  3. What material does your fabricator like to work with?


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close