Cryptic crossword clue
Lack variety in touch display type 7

The most common and most likely answer to this crossword clue is the 7 letter word BACKLIT

I've seen this crossword clue in The Guardian
B
A
C
K
L
I
T

Buddy explains!

The straight part
We know that "display type" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case display type = backlit.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does BACKLIT mean?

BACKLIT verb
  1. To illuminate something from behind.
BACKLIT adjective
  1. Lit or illuminated from behind.

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