What was the name of the light that looked like an LCD screen when reading at night? The flat one, the one that shines on the book

When reading at night, there was a kind of light that looked like an LCD screen, which was often called a reading light. It's a device designed to provide clear and bright light for reading at night. It usually consists of multiple LED lights that can be integrated into bookcases or bookshelves. The working principle of these reading lights was to integrate LED lights into the bookcase or between the tablets on the bookshelf to provide a visual effect similar to an LCD screen when reading.