The phrase "a type of viewer" is correct and usable in written English.
It can be used when categorizing or describing a specific kind of viewer, such as in discussions about media, technology, or audience analysis.
Example: "In the context of film studies, a type of viewer might be someone who prefers action movies over romantic comedies."
Alternatives: "a category of viewer" or "a kind of viewer".
Through his photographic studies he established the presence of dark clouds of interstellar matter in the Milky Way Galaxy, and he was the first to use the stereocomparator (a type of stereoscopic viewer), which greatly helps in the discovery and identification of variable or moving objects in celestial photographs.
I enjoyed them nearly as much as I loved watching a Certain Type Of Viewer give themselves an aneurysm at a second-generation Bangladeshi woman winning the Great BRITISH Bake Off; a competition in which she turned out stunning examples of Austrian Spanische Windtorte, Bavarian Russe and French mille-feuille.
In fact, many TV producers are purposely making "bad" shows to appeal to a certain type of viewer.
If this sounds like a mix of juvenile and puerile, it's because it is; the combination works really, really well and is catnip to a certain type of viewer.
"It isn't just the way you tell a story that gets in the way of the truth -- it's the stories you choose to tell!" The program's lineup plainly targeted a certain type of viewer.
I love her twice as hard for depriving a certain type of viewer of the chaotic chavs-on-tour spectacle they might have been expecting by taking entirely normal holidays and considering sound financial options.
The Video Hub automatically analyzes the content, environment, demographic characteristics and delivery metrics to help pinpoint the right time to deliver and advertisement to a specific type of viewer.
If you are uncomfortable about a type of video, tell the viewers about what and why you don't like it, and then stop posting that type of video.
Rather, the goal is to place programming that draws one type of viewer against programming with an opposite appeal so as not to split one's own slice of the audience pie.
One of the things that I've also noticed - thanks to my father who was a film-maker - was how film has a type of grammar that intensifies the viewers' experiences.
