With advances in electronics technology, the design of organic light - emitting diode (OLED) panels,
such as planar information displays, has been improved and their thicknesses have also been reduced. In
particular, unlike an LCD (Liquid Crystal Display) information display device, an LED panel can reduce
the number of layers constituting a screen, and can also reduce the thickness of each layer. Today, the
development direction of the display device is focused on the appearance of the visible part, the aspect of
the power efficiency, the quality of the image, and the like. But the part about the sound is being
overlooked in the age of five-sense-satisfaction. However, the information display device is transferred from a CRT (Cathode Ray tube) to an LCD and from an LCD to an LED, and it is also possible to realize
effects on high-quality direct sound. Conventional LCD monitors and TVs generally have a speaker in the
downward direction or a sound from the rear to hear the reflected sound from the wall and the floor. In
this study, we introduce the direct driving speaker which implements the sound by directly vibrating the
information display glass layer on the LED panel, and show how to improve the sound quality of this flat
panel display speaker. Using the LED glass panel as a diaphragm, it is confirmed that the sound quality is
clear and the sound source can be reproduced effectively in a wide frequency band.