Abstract: A combination structure for adjusting the clearance of projected images includes a micro projecting panel, a micro projector body, an elastic spring, a quarter wave plate set and an adjusting screw. The micro projecting panel is arranged at the peripheral of a projecting window of the micro projector body. The quarter wave plate set is inserted into an adjusting groove of the micro projector body. A supporting arm of the quarter wave plate set is arranged in an axial hole of the micro projector body. The elastic spring and the adjusting screw are arranged into the axial hole of the micro projector body. The adjusting screw is adjusted for finely adjusting the space between the quarter wave plate set and the micro projecting panel. By applying the combination structure, the clearance of projected images can be improved.

Abstract: In priority art, the projector emits light through lens and other optical devices to display devices for projecting images. Such devices produce a lot of heat. Present cooling model structure must use over 2 fans to reduce the working temperature of the projector and keep the projector functional. However, it cause increasing of electricity consuming and the price of production. The invention use only one fan and exhaust the heat by the combination of heat conductive nugget (33) and heat conductive object (32) for reducing working temperature and keep the projector functional.

Abstract: An audio and video gadget is an entertainment device provided with audio and video functions and communication functions and easily carried by a user. The audio and video gadget comprises a speaker set having a speaker therein and outputting power, a multimedia decoder over the speaker set, wherein the speaker set plays sound from the multimedia decoder, accompanying with video played by a phone, a light-emitting-diode lamp mounted with two sides of the multimedia decoder, wherein the light-emitting-diode lamp has an arc shape, a smart-phone pedestal over a top surface of the multimedia decoder, wherein the smart-phone pedestal is replaceable, and a pico projector over the light-emitting-diode lamp, wherein the light-emitting-diode lamp comprises a transmitting channel therein connected to the pico projector and the multimedia decoder, wherein the pico projector projects an image output from the multimedia decoder and the phone.