of a laundry processing machine first when the user turns the rotary knob 80 clockwise or counter clockwise the shaft 82 in the rotary switch 52 rotates with the rotary knob 80 and this changes the movement of the switching circuit due to this change in the switching circuit a laundry processing machine controls the washing rinsing or tumble drying depending on the option chosen when the option is chosen in a laundry processing machine one of plural leds 54 will emit light the light emitted by led will transmit the plural transparent protrusions corresponding to the led and with the rotation of the rotary knob will externally show the selected option the rib 70 formed on the rear of the display cover 72 blocks in between the plural transparent protrusions 60 therefore the led 54 light does not spread except the transparent protrusions 60 which placed in corresponding locations of back and forth directions therefore external spreading of light will be prevented hence increasing user recognition and as there is no need to attach a separate sheet or print on the back of the transparent window 62 production process becomes simpler and there is a lower risk of faulty products fig6 on one hand shows the perspective view of an enlarged version of the led supporter of the control panel of a laundry processing machine according to the second.