Assertion: lcd | /r/Desires | external light
Facets:
value: to produce a visible image
type: PURPOSE
Source sentences:
text: Since LCDs produce no light of their own, they require external light to produce a visible image.[citation needed]
text: Not being self-lit, LCDs also required external lighting if they were going to be used in low-light situations, which made existing display technologies even more unattractive in overall power terms.
text: Since LCDs produce no light of their own, they require external light to produce a visible image.