Patent ID: 8363178

Claim:
A display device, comprising: a window for transmitting first light generated from a natural light source, the window having a first side and a second side opposite the first side with the natural light source being disposed on a first side of the window; and a display panel disposed on one of the first side and the second side of the window, the display panel comprising: a first substrate contacting the window; a second substrate attached onto the first substrate; a display element on the first substrate; a frame for enclosing edges of the first and second substrates; and an auxiliary light source disposed in a vicinity of the window on the first side of the window to generate second light, wherein the light intensity of the auxiliary light source is controlled by user or system, wherein the display panel displays an image to viewed on a second side of the window using the first and second light, and wherein the frame includes a first frame enclosing the edge of the first substrate and a second frame enclosing the edge of the second substrate, wherein the second frame is coupled to the first frame in a side of the display panel, wherein the display panel includes means for fixing the display panel onto the window, wherein the first frame is attached to the first side of the window by the means, and wherein the window is a structure of a building installed for observing an object from one side to the other side, lighting, ventilation, and decoration of the building.