This situation was often referred to as the "reading mode", which was a protection mechanism of the novel reader to prevent the user from losing the device's response due to accidental operation while reading. When the user entered reading mode, the phone would pause all running programs and lock the screen in one place to ensure that the user could not slide the screen, click on the elements on the screen, or let the phone fall from a high place.
If the user accidentally triggered the reading mode while reading a novel, the phone might turn black from the edge to the middle. This was because in reading mode, the phone would lock the screen in one place to prevent the user from performing any interfering operations. If the user tried to swipe the screen or click on an element on the screen while reading, the screen might unlock and trigger a black screen.
If the user finds that the phone has a black screen while reading a novel, they can try to turn off the reader or reopen the reader to cancel the reading mode. In addition, you can also try to place the phone on a stable desktop or adjust the brightness and contrast of the screen to avoid similar problems.
There was no obvious difference between reading a novel on a black screen or a white screen at night because there was no image displayed on the black screen or the white screen. The effect on the eyes mainly came from brightness and contrast.
If the brightness of the screen was low and the contrast was low, there would be some visual fatigue and discomfort when reading. Therefore, it was recommended to increase the brightness and contrast of the screen when reading at night to reduce the burden on the eyes.
Using a black or white screen was not the most important factor. The correct reading posture and lighting environment were also very important. Maintaining a good reading posture, avoiding staring at the screen for a long time, and maintaining an appropriate brightness and distance can reduce the burden on the eyes and improve reading comfort.
I'm not certain about its popularity. It might be popular within a specific niche of visual novel enthusiasts who are interested in its particular style or theme. However, it may not be as well - known to the general public as some mainstream video games or more widely promoted visual novels.
It could mean that a black screen is used in the context of a story. For example, in a movie or a video game, a black screen might be used to create suspense, mark the end of a scene, or represent a character's unconscious state or a time jump in the story.
A black screen for IG story can be used for various purposes. For example, it can be used as a simple and minimalistic background for text - based stories. You can write important announcements, quotes, or captions on the black screen. It also gives a mysterious or dramatic effect to your story, making viewers curious.
You can use the built - in editing tools on Instagram. Open the story creation, select the 'Create' option. Then, find a plain black background image from your gallery (if you have one saved) and add it to your story. Another way is to use a photo - editing app like Snapseed. Open the app, create a new black image and save it. Then upload this black image to your IG story.
You might try disabling the auto-play feature or checking your internet connection. Sometimes, a glitch in the app can cause this. Give it a restart and see if that helps.