Hair straightener and integrated switch for control and display

A hair straightener comprising a first clamping plate part, a second clamping plate part and an integrated switch for control and display arranged on an inner side of the second clamping plate part;

• wherein the integrated switch for control and display comprises a temperature control knob assembly for regulating and controlling temperature, a display button assembly for displaying the temperature and turning on or off a power supply, and a control motherboard for digital display and electrical control;
• wherein the temperature control knob assembly and the display button assembly are installed on the control motherboard;
• wherein the temperature control knob assembly is arranged with an accommodation space for accommodating the display button assembly;
• wherein the temperature control knob assembly further comprises a temperature control knob and an intermediate gear element while the control motherboard is provided with a rotary coding switch element which is connected with the temperature control knob through the intermediate gear element;
• wherein the intermediate gear element comprises a main gear and a secondary gear which are meshed with each other, wherein the secondary gear is provided with a polygonal prism inserted into the rotary coding switch element, the temperature control knob is fixed with the main gear, and both of the temperature control knob and the main gear are provided with a through-hole for accommodating the display key, wherein the main gear and the secondary gear are arranged on the intermediate connecting member.