Abstract: A display device includes a substrate and a plurality of unit pixels disposed on the substrate. Each unit pixel includes a plurality of sub-pixels, a plurality of light sensing pixels, and a plurality of partition wall members. Each of the sub-pixels includes a light emitting element that emits light and a light emitting area from which the light is emitted. Each of the light sensing pixels includes a light receiving element that outputs a sensing signal corresponding to the light and a light receiving area that receives the light. In a plan view, each of the partition wall members surrounds the corresponding light receiving area and overlaps at least some of the sub-pixels.

Abstract: Disclosed is a treatment device capable of suppressing generation of pain in a person to be treated and obtaining a continuous and fundamental skin treatment effect. The treatment device includes a handpiece body, a needle unit which is provided at one side of the handpiece body and includes a plurality of needles including hollow portions therein and having front ends inserted into an epidermis of skin of a person to be treated, a high frequency generator which is electrically connected to the needle unit, receives a high frequency current when the front ends of the needles are inserted into the epidermis, and heats the needles using the high frequency current, and a medicine delivery unit which communicates with the hollow portions of the plurality of needles and delivers a medicine to the epidermis through the hollow portions when the front ends of the needles are inserted into the epidermis.

Abstract: Disclosed is a skin treatment device including a treatment unit inserted into skin to stimulate the skin, a holder unit for detachably mounting the treatment unit thereonto to transfer a signal to the treatment unit, and a handpiece unit for mounting the holder unit thereonto to supply the signal to the holder unit, thereby rapidly exchanging the treatment unit.