A backlight unit includes a light source having an emission region, a wiring board having the light source mounted thereon, a light guide plate having a side surface into which light from the light source enters, and a front surface from which the light exits, a light shielding adhesive tape adhering to the wiring board, and an optical sheet which overlaps with the front surface of the light guide plate. The front surface of the light guide plate includes an effective region serving as a planar light source and a light entering region ranging from the side surface to the effective region. The wiring board and the light-shielding adhesive tape each have a part positioned in the light entering region, and the optical sheet is arranged from the effective region to the light entering region. An end portion of the optical sheet overlaps with the light-shielding tape.
1. A backlight comprising:
a light emitting diode;
a wiring board;
a light guide plate;
an optical sheet; and
a double-sided tape,
wherein
the light emitting diode has an emission region and is mounted on the wiring board,
the light guide plate has a side surface into which light from the light emitting diode enters and a front surface from which the light exits,
the optical sheet overlaps with the front surface of the light guide plate,
the double-sided tape adheres to the wiring board,
the front surface of the light guide plate includes an effective region serving as a planar light source and a light entering region between the side surface and the effective region, and
the optical sheet overlaps with the double-sided tape in the light entering region.
2. The backlight according to claim 1 , wherein the double-sided tape overlaps with the light emitting diode.
3. The backlight according to claim 1 , wherein the double-sided tape adheres to the optical sheet.
4. The backlight according to claim 1 , wherein the double-sided tape is for adhering to a display panel.
5. The backlight according to claim 1 , wherein the double-sided tape has a light shielding layer.
6. A backlight comprising:
a light emitting diode having an emission region;
a wiring board having the light emitting diode mounted thereon;
a light guide plate having a side surface into which light from the light emitting diode enters and a front surface from which the light exits;
an adhesive tape adhered to the wiring board; and
an optical sheet disposed above the front surface of the light guide plate,
wherein the front surface of the light guide plate comprises an effective region for outputting the light from the light emitting diode and a light entering region provided between the effective region and the side surface,
wherein the optical sheet extends from the effective region to the light entering region and overlaps with the adhesive tape in the light entering region.
7. The backlight according to claim 6 , wherein the adhesive tape overlaps with the light emitting diode.
8. The backlight according to claim 6 , wherein the adhesive tape adheres to the optical sheet.
9. The backlight according to claim 6 , wherein the adhesive tape is for adhering to a display panel.
10. The backlight according to claim 6 , wherein the adhesive tape has a light-shielding layer.