Low profile backlight apparatus

G - Physics – 02 – F

Patent

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Details

G02F 1/13357 (2006.01) G02B 3/00 (2006.01)

Patent

CA 2708522

A backlight apparatus (8) includes a point source (16) of radiant electromagnetic energy. A total internal reflection (TIR) lens (14) has a vertical central axis (24) located along a path of the radiant electromagnetic energy. The TIR lens (14) receives and evenly distributes the radiant electromagnetic energy (40) at an output face (38). The radiant electromagnetic energy (40) exiting the TIR lens (14) is substantially collimated and defines vertical optical paths parallel to the vertical central axis (24). A first diffuser (18, 20) receives the radiant electromagnetic energy from the output face of the TIR lens and spreads the radiant electromagnetic energy to a predetermined first angle relative to the vertical optical paths.

Un appareil de rétroéclairage (8) comprend une source ponctuelle (16) d'énergie électromagnétique radiante. Une lentille à réflexion totale interne (TIR) (14) possède un axe central vertical (24) situé le long d'un trajet de l'énergie électromagnétique radiante. La lentille TIR (14) reçoit et distribue uniformément l'énergie électromagnétique radiante (40) au niveau d'une face de sortie (38). L'énergie électromagnétique radiante (40) qui quitte la lentille TIR (14) est sensiblement collimatée et définit des trajets optiques verticaux parallèles à l'axe central vertical (24). Un premier diffuseur (18, 20) reçoit l'énergie électromagnétique radiante provenant de la face de sortie de la lentille TIR et diffuse l'énergie électromagnétique radiante à un premier angle prédéterminé par rapport aux trajets optiques verticaux.

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