Back to results
US 8,770,772 B1Granted
Luminous keyboard
AssigneeChangshu Sunrex Technology Co., Ltd.
InventorQing Zhang
Life of this patent
Estimating the term…
Abstract
A luminous keyboard includes: a press key unit and a backlight module unit including a light guiding plate, a plurality of light guiding points, an upper light-permeable thin film disposed on a top surface of the light guiding plate, a lower light-permeable thin film disposed on a bottom surface of the light guiding plate, and a luminous element. The upper and lower light-permeable thin films respectively have refractive indices lower than that of the light guiding plate.
Claims11
A luminous keyboard, comprising:
- a press key unit including a plurality of press keys;
- and
- a backlight module disposed under said press key unit and including a light guiding plate, a plurality of light guiding points which are formed on a bottom surface of said light guiding plate and corresponding in position to said press keys, an upper light-permeable thin film disposed on a top surface of said light guiding plate, a lower light-permeable thin film that is disposed on said bottom surface, that is opposite to said upper light-permeable thin film and that covers said light guiding points, and a luminous element from which light beams are incident to said light guiding plate;
- wherein said upper and lower light-permeable thin films respectively have refractive indices lower than that of said light guiding plate so that a total internal reflection of the light beams occurs between said upper and lower light-permeable thin films, and said light guiding points scatter and direct the light beams to pass through said upper light-permeable thin film and to illuminate said press keys.
1 more element
Dependencies are inferred from the claim text.