As long as they are in the screen, no. Flat-panel devices contain things like indium and tin and the semiconductors in the computer that control displays contain arsenic, phosphorus, gallium, and other things. None are dangerous as they sit there in your computer or laptop.
There are some dangers in the mining of some of those materials, as well as in the manufacturing processes and in recycling, which must remove and separate the materials.
And in case you were wondering, the radiation emitted from computer screens is very small, far below levels that could cause permanent eye damage like cataracts. Computer Vision Syndrome (CVS) is a term used to describe the symptoms that can occur from using a computer in the wrong conditions, such as eye fatigue, dry eyes, headaches, and difficulty focusing. This is caused by being to close to the computer and from poor or no surrounding lighting causing high contrast and glare, putting excess strain from the eyes, but not having to do with the computer screen itself being harmful.
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