Backlight apparatus reduced in thickness
View Patent ↗In a backlight apparatus for an LCD, a plurality of bar-shaped first LED light sources are arranged on the reflective plate to laterally emit light. A plurality of light shades are arranged above the first light sources. A transparent plate is placed above the light shades. Scattering patterns are formed in the bottom of the transparent plate in positions corresponding to the light shades. A bar-shaped second LED light source is arranged at a side of the transparent plate to emit light into the transparent plate. The light source arranged at the side of the transparent plate prevents the formation of dark areas as a problem in the prior art, thereby enhancing the entire uniformity of light. Then, the backlight apparatus can be maintained thin even when applied to a large-sized LCD.
1. A backlight apparatus arranged under a Liquid Crystal Display (LCD) panel to illuminate the LCD panel, comprising:
a reflective plate;
a plurality of bar-shaped first light sources each having Light Emitting Diodes (LEDs), and arranged on the reflective plate to emit light generated by the LEDs in a lateral direction;
a plurality of light shades arranged above the first light sources;
a transparent plate placed above the light shades;
scattering patterns formed in the bottom of the transparent plate in positions corresponding to the light shades; and
a bar-shaped second light source having LEDs, and arranged at a side of the transparent plate to emit light into the transparent plate.
2. The backlight apparatus according to claim 1 , wherein the light shades are attached to top of the first light sources, and the transparent plate is spaced from the light shades to a predetermined gap.
3. The backlight apparatus according to claim 1 , wherein the light shades are attached to the bottom of the transparent plate, and the transparent plate is spaced from the first light sources to a predetermined gap.
4. The backlight apparatus according to claim 1 , wherein the first light sources, the light shades and the transparent plates are stacked one atop another in their order.
5. The backlight apparatus according to claim 1 , further comprising a diffuser plate placed above the transparent plate.
6. The backlight apparatus according to claim 1 , wherein each of the first and second light sources comprises a plurality of LEDs which are arranged in line.
7. The backlight apparatus according to claim 1 , wherein the scattering patterns comprise one selected from the group consisting of an ink dot, a microscopic roughened structure and a Lambertian pattern.
8. The backlight apparatus according to claim 1 , wherein the reflective plate comprises a Lambertian surface.
9. A backlight apparatus arranged under a Liquid Crystal Display (LCD) panel to illuminate the LCD panel, comprising:
a reflective plate;
a plurality of bar-shaped first light sources each having Light Emitting Diodes (LEDs), and arranged on the reflective plate to emit light generated by the LEDs in a lateral direction;
a plurality of light shades attached to the top of the first light sources, respectively;
a transparent plate placed above the light shades;
scattering patterns formed in the bottom of the transparent plate in positions corresponding to the light shades; and
a bar-shaped light second source having LEDs, and arranged at a side of the transparent plate to emit light into the transparent plate.
10. The backlight apparatus according to claim 9 , further comprising a diffuser plate placed above the transparent plate.
11. The backlight apparatus according to claim 9 , wherein each of the first and second light sources comprises a plurality of LEDs which are arranged in line.
12. The backlight apparatus according to claim 9 , wherein the scattering patterns comprise one selected from the group consisting of an ink dot, a microscopic roughened structure and a Lambertian pattern.
13. The backlight apparatus according to claim 9 , wherein the reflective plate comprises a Lambertian surface.
14. A backlight apparatus arranged under a Liquid Crystal Display (LCD) panel to illuminate the LCD panel, comprising:
a reflective plate;
a plurality of bar-shaped first light sources each having Light Emitting Diodes (LEDs), and arranged on the reflective plate to emit light generated by the LEDs in a lateral direction;
a transparent plate placed above the first light sources;
scattering patterns formed in the bottom of the transparent plate in positions corresponding to the first light sources;
a plurality of light shades attached to the underside of the scattering patterns, respectively; and
a bar-shaped second light source having LEDs, and arranged at a side of the transparent plate to emit light into the transparent plate.
15. The backlight apparatus according to claim 14 , further comprising a diffuser plate placed above the transparent plate.
16. The backlight apparatus according to claim 14 , wherein each of the first and second light sources comprises a plurality of LEDs which are arranged in line.
17. The backlight apparatus according to claim 14 , wherein the scattering patterns comprise one selected from the group consisting of an ink dot, a microscopic roughened structure and a Lambertian pattern.
18. The backlight apparatus according to claim 14 , wherein the reflective plate comprises a Lambertian surface.