Back light module and liquid crystal display
View Patent ↗A back light module is provided. The back light module comprises a light-guiding plate, a side light source and a bottom light source. The side light source is positioned on one side facing a side surface of the light-guiding plate. The bottom light source is positioned on a bottom surface of the light-guiding plate. Light from the side light source and the bottom light source both emerge from a top surface of the light-guiding plate. The side light source and the bottom light source together provide a bright surface light source that illuminates a liquid crystal display to produce a better display effect. In addition, this invention also provides e liquid crystal display comprising a transmissive or transflective liquid crystal display panel and the aforementioned back light module.
1. A back light module for providing a plane light source, at least comprising:
a light-guiding plate having a top surface, a bottom surface and at least a side surface;
a side light source positioned next to one side surface of the light-guiding plate, wherein light from the side light source is able to enter the side surface of the light-guiding plate and emerges from the top surface after deflection by the bottom surface;
a bottom light source attached to the bottom surface of the light-guiding plate, wherein light from the bottom light source is able to enter the bottom surface of the light-guiding plate and emerge from the top surface of the light-guiding plate; and
a reflective holder positioned next to the side surface of the light-guiding plate that also encloses the side light source.
2. The back light module of claim 1 , wherein the light-guiding plate comprises a wedge-shaped plate.
3. The back light module of claim 1 , wherein the bottom surface has a staircase-like profile or a plurality of recess points etched thereon for scattering the light from the side light source.
4. The back light module of claim 1 , wherein the bottom light source comprises an organic electroluminescence device.
5. The back light module of claim 4 , wherein the electroluminescence device furthermore comprises:
a transparent substrate;
an anode formed over the transparent substrate;
an organic functional layer formed over the anode; and
a cathode formed over the organic functional layer.
6. The back light module of claim 5 , wherein the organic functional layer furthermore comprises:
a hole injection layer formed over the anode;
a hole transmission layer over the hole injection layer,
an organic light-emitting layer formed over the hole transmission layer; and
an electron transmission layer formed between the organic light-emitting layer and the cathode.
7. The back light module of claim 4 , wherein the electroluminescence device furthermore comprises:
a planar layer formed over the bottom surface of the light-guiding plate;
an anode over the planar layer;
an organic functional layer over the anode; and
a cathode over the organic functional layer.
8. The back light module of claim 7 , wherein the organic functional layer furthermore comprises:
a hole injection layer formed over the anode;
a hole transmission layer over the hole injection layer;
an organic light-emitting layer formed over the hole transmission layer; and
an electron transmission layer formed between the organic light-emitting layer and the cathode.
9. A liquid crystal display, comprising:
a liquid crystal display panel;
a back light module for providing a plane light source, comprising:
a light-guiding plate having a top surface, a bottom surface and at least a side surface;
a side light source positioned next to one side surface of the light-guiding plate, wherein light from the side light source is able to enter the side surface of the light-guiding plate and emerges from the top surface after deflection by the bottom surface;
a bottom light source attached to the bottom surface of the light-guiding plate, wherein light from the bottom light source is able to enter the bottom surface of the light-guiding plate and emerge from the top surface of the light-guiding plate; and
a reflective holder positioned next to the side surface of the light-guiding plate that also encloses the side light source.
10. The liquid crystal display of claim 9 , wherein the light-guiding plate comprises a wedge-shaped plate.
11. The liquid crystal display of claim 9 , wherein the bottom surface has a staircase-like profile or a plurality of recess points etched thereon for scattering the light from the side light source.
12. The liquid crystal display of claim 9 , wherein the bottom light source comprises an organic electroluminescence device.
13. The liquid crystal display of claim 12 , wherein the electroluminescence device furthermore comprises:
a transparent substrate;
an anode formed over the transparent substrate;
an organic functional layer formed over the anode; and
a cathode formed over the organic functional layer.
14. The liquid crystal display of claim 13 , wherein the organic functional layer furthermore comprises:
a hole injection layer formed over the anode;
a hole transmission layer over the hole injection layer;
an organic light-emitting layer formed over the hole transmission layer; and
an electron transmission layer formed between the organic light-emitting layer and the cathode.
15. The liquid crystal display of claim 12 , wherein the electroluminescence device furthermore comprises:
a planar layer formed over the bottom surface of the light-guiding plate;
an anode aver the planar layer;
an organic functional layer over the anode; and
a cathode over the organic functional layer.
16. The liquid crystal display of claim 15 , wherein the organic functional layer furthermore comprises:
a hole injection layer formed over the anode;
a hole transmission layer over the hole injection layer;
an organic light-emitting layer formed over the hole transmission layer; and
an electron transmission layer formed between the organic light-emitting layer and the cathode.
17. A back light module for providing a plane light source, at least comprising:
a wedge-shaped light-guiding plate having a top surface, a bottom surface and at least a side surface;
a side light source positioned next to one side surface of the wedge-shaped light-guiding plate, wherein light from the side light source is able to enter the side surface of the wedge-shaped light-guiding plate and emerges from the top surface after deflection by the bottom surface; and
a bottom light source attached to the bottom surface of the wedge-shaped light-guiding plate, wherein light from the bottom light source is able to enter the bottom surface of the wedge-shaped light-guiding plate and emerge from the top surface of the light-guiding plate.
18. The back light module of claim 17 , wherein the bottom surface has a staircase-like profile or a plurality of recess points etched thereon for scattering the light from the side light source.