The phrase "author displayed" is correct and usable in written English.
It can be used when referring to how an author has presented or exhibited something, such as ideas, themes, or information in their work.
Example: "In her latest novel, the author displayed a profound understanding of human emotions."
Alternatives: "the author presented" or "the author showcased".
In his portrayal of that perverse utopia, the author displayed the skills of a dogged reporter and a meticulous archivist.
There is something uniquely satisfying about seeing the marvelous paintings of Carlo Levi — Jewish, anti-fascist, painter and author — displayed at Villa Torlonia, a sumptuous villa that served as the personal residence of Italian fascist dictator Benito Mussolini for nearly 20 years.
And the author displays myopia of his own.
(The author displays an "ironic modesty" and "simplicity" in the writing, Calvino wrote approvingly).
At times, though, the author displays his posters with considerable force.
The author displays a wide-ranging knowledge of production, consumption, natural resources and public policy.
As well as telling an engaging story, the author displays a sure-footed knowledge of the period.
The author displays startling bravado and cleverness as he imagines a world in which heterosexuals are oppressed by the homosexual majority, poets bask in money and celebrity and a Martian robot knows the fate of the world.
The author displays both storytelling skill and acerbic self-knowledge as he explores the relationship between moral constructs and real life in meditations on marriage, European politics and other topics.
In a far-ranging collection of essays and journalism, the author displays a tactical detachment from his subjects, including the Kennedy-assassination industry, the cancer-cure underground and other webs of uncertainty and conjecture.
(The author displays an "ironic modesty" and "simplicity" in the writing, Calvino wrote approvingly). The act of keeping an anti-fascist diary of this sort during the German occupation of Italy carried an automatic death penalty.
