Keyboard and key structure capable of displaying instant image

A keyboard having at least one key structure capable of displaying an instant image, wherein each of the at least one key structure comprises:

• a display unit;
• a key seat disposed above the display unit and forming an accommodation portion that is hollow;
• a first supporting frame having two first arms and two axle portions, wherein each of the first arms has one of the axle portions, and each of the first arms has a bottom end slidably disposed on the accommodation portion;
• a second supporting frame having two second arms and two linking holes, and the second supporting frame and the first supporting frame being arranged in a crossed manner;
• wherein each of the second arms has one of the linking holes formed thereon, each of the second arms has a bottom end pivotally connected to the accommodation portion;
• wherein each of the linking holes is elongated-shaped and has two hole-ends, and the two axle portions of the first arms are slidably disposed in the two linking holes respectively;
• wherein a width of each of the linking holes along an elongated direction of each of the second arms is larger than a height of each of the linking holes along a direction perpendicular to the elongated direction of each of the second arms;
• a translucent keycap, wherein a top end of the first supporting frame and a top end of the second supporting frame are slidably connected to two sides of the translucent keycap, respectively;
• wherein an image information of the display unit is shown through the accommodation portion and the translucent keycap so as to be shown outside;
• a circuit membrane disposed above the display unit;
• and
• an elastic member disposed on the circuit membrane;
• wherein the elastic member is adjacent to one side of the accommodation portion, and a pressed tab that corresponds in position to the elastic member is formed on one side of the translucent keycap, and wherein the circuit membrane has a conductive portion, and the elastic member abuts against the conductive portion;
• wherein, when the translucent keycap is not pressed, the two axle portions of the first arms each abut against one of the two hole-ends of each of the linking holes, respectively;
• wherein, when the translucent keycap is pressed, the two axle portions of the first arms each abut against the other one of the two hole-ends of each of the linking holes;
• wherein the accommodation portion of the key seat has a front side, a rear side, and two lateral sides that are opposite to each other, wherein a conduction hole is formed on the rear side, and the elastic member is disposed in the conduction hole, wherein the accommodation portion has a limiting recess and a blocking flange that are formed on a bottom of the front side, the blocking flange is formed above the limiting recess, and wherein another side of the translucent keycap has a limiting protrusion that extends outward in a direction away from the pressed tab, and the limiting protrusion is movably disposed in the limiting recess.