Abstract: A display apparatus and a manufacturing method thereof which allow a component to be replaced and repaired simply, rapidly, and stably are provided. The display apparatus comprises a main body which accommodates a light source part, and comprises a display element which displays an image using light emitted from the light source part; an element panel which accommodates the display element; a front cover which is coupled to the main body and provided with a panel mounting part to which the element panel is detachably coupled; and an element driving board which is coupled to the front cover, is opposite to the main body, interposes the front cover between the element driving board and the main body, and is electrically connected with the display element.

Abstract: A display apparatus and a manufacturing method thereof which allow a component to be replaced and repaired simply, rapidly, and stably are provided. The display apparatus comprises a main body which accommodates a light source part, and comprises a display element which displays an image using light emitted from the light source part; an element panel which accommodates the display element; a front cover which is coupled to the main body and provided with a panel mounting part to which the element panel is detachably coupled; and an element driving board which is coupled to the front cover, is opposite to the main body, interposes the front cover between the element driving board and the main body, and is electrically connected with the display element.

Abstract: An optical assembly for a projection system includes a light tunnel, a light tunnel holder that supports the light tunnel, an exterior casing that supports the light tunnel holder, a resilient member disposed between the light tunnel holder and the exterior casing to resiliently support the light tunnel holder, and an aligning unit that is disposed opposite the resilient member to align the light tunnel. The aligning unit can have at least one holder protrusion formed on an outer surface of the light tunnel holder, and a movable member that has a pressing protrusion for contact with the holder protrusion. The movable member slides on the outside of the light tunnel holder.