It is correct and usable in written English.
You can use it when you are describing someone's reaction to a situation, for example, "When he heard the news, he displayed no emotion."
From that moment he has displayed no emotion.
The defendants displayed no emotion at her descriptions of the carnage.
He displayed no emotion as he snapped to his feet, his shackles clattering, and was ushered out by court officers.
Mr. Warren, a computer technician who did not testify in his own defense, displayed no emotion today as the 63 guilty verdicts were read.
Kidd, of High Street, Seaford, East Sussex, displayed no emotion as district judge William Ashworth sentenced her to five months prison, concurrent on each count, and imposed a restraining order.
She's sitting cross-legged on the floor at their feet, displaying no emotion.
"I am horrified that I have done this," he said, displaying no emotion.
Televised images from the courthouse in St. Pölten, Austria, showed Mr. Fritzl displaying no emotion as he was led out of the courtroom by guards.
Hit Girl is eleven years old, and schooled by her father to slaughter and maim while displaying no emotion other than fizzy glee.
On another level, both Dash and Violet display no emotion or regret at the deaths of those who are trying to kill them, such as when Dash outruns pursuers who crash their vehicles while chasing him, or when both of them witness their parents destroy several attacking vehicles with people inside, in such a manner that the deaths of those piloting them is undeniable.
