Electrophoretic display keypad structure
AssigneeIchia Technologies, Inc.
InventorChin-Chun Huang
Life of this patent
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Abstract
An electrophoretic display keypad structure utilizes a whole piece of electrophoretic display film to show a plurality of figures for keys. The electrophoretic display film is disposed on a printed circuit board having a patterned electrode and sealed by a sealant or a sealing material applied to entire periphery of the electrophoretic display film for preventing humidity or pollution, thereby to display excellent figures and be made relatively easily. The figures displayed may be changed by selecting a desired mode, and users may accordingly easily choose desired figures for pressing the keys.
Claims18
An electrophoretic display keypad structure, comprising:
- a first printed circuit board comprising a circuit thereon;
- a plurality of metal domes disposed above the circuit, wherein, when the metal domes are pressed, the metal domes are electrically connected to the underlying circuit;
- a plurality of plungers disposed above the metal domes;
- the first printed circuit board is disposed below the metal domes;
- a second printed circuit board disposed above the plungers;
- an electrophoretic display film disposed above the second printed circuit board and sealed at a periphery thereof, wherein the electrophoretic display film and the second printed circuit board together perform a display function, the electrophoretic display film displays a plurality of figures when the display function is turned on, and the figures are located correspondingly to the metal domes;
- a front light unit disposed above the electrophoretic display film;
- and a keycap structure disposed above the front light unit.
An electrophoretic display keypad structure, comprising:
- a printed circuit board;
- an electrophoretic display film disposed above the printed circuit board and sealed at a periphery thereof, wherein the electrophoretic display film and the printed circuit board together perform a display function, the electrophoretic display film displays a plurality of figures representing button locations when the display function is turned on;
- a front light unit disposed above the electrophoretic display film;
- wherein a first printed circuit board is disposed below the metal domes;
- a second printed circuit board disposed above the plungers;
- and a touch pad disposed above the front light unit for output of signals corresponding to the button locations under touched positions of the touch pad.
Dependencies are inferred from the claim text.