Development of a Constant Temperature Control Light Emitting Diode Light Cold Mask Reflecting Real-Time Skin Temperature Change.

Abstract

To treat and improve skin condition, photo masks using LEDs have been developed and widely marketed to consumers. However, since the skin condition of the user varies, it is difficult to simulate suitable conditions, because various variables such as light output intensity and irradiation time must be applied to the mask development. Currently, photo masks on the market were developed considering only the parameters related to light irradiation. Existing products do not consider the burning sensation after skin treatment and skin temperature increase from the use of masks, which has been causing user inconvenience. In this paper, the LED light cold mask was designed, fabricated, and analyzed for light output characteristics to control wavelength selection and output to maximize the therapeutic effect of various LED lights. Additionally, circulating water was used to eliminate the burning sensation caused by the use of LED masks. The temperature of the circulating water was lowered below 10 °C using a thermoelectric element and PT100 Ω temperature sensor. An infrared temperature sensor was used to measure the skin temperature in real time. When the skin temperature increased by 0.5 °C, the water was cooled and circulated. As a result, it was confirmed that the temperature of the skin could be maintained uniformly within the set temperature range.