A backlit erasable
LED writing board includes a light guide panel, a plurality of light emitting diodes positioned on at least one side surface of the light guide panel for providing light to the light guide panel, a reflecting plate at a back surface of the light guide panel for reflecting light toward a front surface of the light guide panel, and an impervious translucent film at the front surface of the light guide panel for use as an erasable writing surface.
A backlit erasable
LED writing board, comprising:a light guide panel;a plurality of light emitting diodes positioned on at least one side surface of the light guide panel for providing light to the light guide panel;a reflecting plate at a back surface of the light guide panel for reflecting light toward a front surface of the light guide panel; andan impervious translucent film at the front surface of the light guide panel for use as an erasable writing surface.
. A backlit erasable
LED writing board, comprising:a light guide panel;a plurality of light emitting diodes positioned on at least one side surface of the light guide panel for providing light to the light guide panel;a frame at a side surface of the light guide panel having a reflective internal surface for reflecting light for the plurality of light emitting diodes toward the side surface of the light guide panel;a reflecting plate at a back surface of the light guide panel for reflecting light toward a front surface of the light guide panel; andan impervious translucent film at the front surface of the light guide panel for use as an erasable writing surface.
The backlit erasable
LED writing board of claim 10, further comprising a variable power supply that can selectively output a voltage within a range of voltages to the plurality of light emitting diodes such that light output of the backlit erasable
LED writing board can be controlled to output one of different brightness levels.
The backlit erasable
LED writing board of claim 14, wherein the visible light emitting diodes and ultraviolet light emitting diodes that are separately controllable such that three lighting modes of ultraviolet, visible and ultraviolet/visible can transmitted through the erasable writing surface.
