Methods for eliminating bright point emissions from liquid crystal microdisplays

Peter L. Marasco

doi:10.1117/12.541298

8 September 2004 Methods for eliminating bright point emissions from liquid crystal microdisplays

Peter L. Marasco

Proceedings Volume 5442, Helmet- and Head-Mounted Displays IX: Technologies and Applications; (2004) https://doi.org/10.1117/12.541298
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

Due to limitations in manufacturing technology, current liquid crystal microdisplays cannot be manufactured without pixel defects. Among other defects, pixels can fail in their transmissive state, yielding a bright spot in the image relayed to the display wearer. Experience with military night-vision devices has shown that bright image defects can be extremely objectionable, as they can be distracting or can be incorrectly identified as objects of interest, such as targets. Image intensifier tube manufacturers eliminate bright point emissions by burning the image tube phosphor with a laser, effectively turning the bright spot into a black spot, an image defect considered far less distracting. Unfortunately, formal methods for eliminating bright point defects in liquid crystal microdisplays have not been thoroughly investigated. Methods such as severing circuitry or blasting the liquid crystal display pixel with a laser should be ineffective or even create a larger bright defect, further aggravating the problem. Numerous methods that could be applied are known to have advantages and disadvantages. This paper will examine the use of pixel blocks and fiberoptics as possible methods for eliminating or minimizing the visibility of bright point emissions and their impact on the visibility of the micro liquid crystal display.

Citation Download Citation

Peter L. Marasco "Methods for eliminating bright point emissions from liquid crystal microdisplays", Proc. SPIE 5442, Helmet- and Head-Mounted Displays IX: Technologies and Applications, (8 September 2004); https://doi.org/10.1117/12.541298

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Signal attenuation

LCDs

Image intensifiers

Manufacturing

Head-mounted displays

Liquid crystals

Fiber optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years