The invention relates to an assembled component comprising a first and a second component. Further, it also has a problem that an adjustment at a factory is required every device to increase manufacturing process, thereby being troublesome. The acoustic cavity includes an array of optical waveguides and an array of acoustic transducers. Thus, the first electrodes are used during resetting or addressing and the second electrodes and the third electrodes are use during sustaining so as to maintain the light emission and enhance the contrast greatly.