Backlight module and backlight keyswitch thereof
AssigneeDarfon Electronics Corp.
InventorsChao-Yu Chen, Po-Yueh Chou
Life of this patent
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Abstract
A backlight module for illuminating a keycap includes a shielding sheet, a light guide panel, a lighting board disposed under the light guide panel, and a first protrusion structure. The shielding sheet includes a light permeable area. The light guide panel is disposed under the shielding sheet and has a light guide hole for accommodating a light source of the lighting board. The first protrusion structure is formed on the shielding sheet and protrudes toward the light source. The first protrusion structure is at least partially not overlapped with the light source in a vertical direction, for reflecting and scattering at least partial light of the light source to enter the light guide panel for lateral transmission.
Claims20
A backlight module for illuminating at least one keycap, the backlight module comprising:
- a shielding sheet having a light permeable area;
- a light guide panel disposed under the shielding sheet and having a light guide hole;
- a lighting board disposed under the light guide panel and having a light source accommodated within the light guide hole;
- and
- a first protrusion structure formed on the shielding sheet and protruding toward the lighting board, the first protrusion structure at least partially not overlapping with the light source in a vertical direction, and the first protrusion structure reflecting and scattering at least partial light of the light source to enter the light guide panel for lateral transmission.
A backlight keyswitch comprising:
- a keycap;
- a support plate disposed under the keycap;
- and
- a backlight module disposed under the support plate, the backlight module comprising:
- a shielding sheet having a light permeable area corresponding to the keycap;
- a lighting board disposed under the shielding sheet and having a light source;
- and
- a light guide panel having a light guide hole to accommodate the light source, an inclined surface structure being formed along an edge of the light guide hole and tilted toward the shielding sheet to guide at least partial light of the light source to enter the light guide panel via the inclined surface structure for lateral transmission.
Dependencies are inferred from the claim text.