초록 ▼

A liquid crystal display device comprises a liquid crystal panel having two substrates and a liquid crystal material sealed therebetween; a backlight module disposed under the liquid crystal panel; and a display case for housing the liquid crystal panel and the backlight module. The backlight module

A liquid crystal display device comprises a liquid crystal panel having two substrates and a liquid crystal material sealed therebetween; a backlight module disposed under the liquid crystal panel; and a display case for housing the liquid crystal panel and the backlight module. The backlight module is a direct point-light type and comprises a plurality of point light sources, a reflector, a diffuser and a plurality of optical sheets. The reflector has a plurality of openings respectively positioned in relation to the point light sources such that the light provided by the point light sources can pass through the openings of the reflector and then reach the diffuser. The diffuser has a plurality of dot elements which are formed thereon and compose at least one of radially variable dot specific pattern. The radially variable dot specific pattern defines a center portion, and at least one of the point light sources is aligned relative to the center portion of the radially random dot specific pattern.

대표청구항 ▼

What is claimed is: 1. A direct point-light type backlight module comprising: a plurality of point light sources; a reflector reflects lights that are supplied by the light sources; and a diffuser having a plurality of dot elements which are formed thereon and compose a radially variable dot specif

What is claimed is: 1. A direct point-light type backlight module comprising: a plurality of point light sources; a reflector reflects lights that are supplied by the light sources; and a diffuser having a plurality of dot elements which are formed thereon and compose a radially variable dot specific pattern, wherein the radially variable dot specific pattern defines a center portion thereof and at least one of the point light sources is approximately aligned with the center portion of the radially variable dot specific pattern. 2. The direct point-light type backlight module as claimed in claim 1, wherein the reflector having a plurality of openings respectively positioned in relation to the point light sources. 3. The direct point-light type backlight module as claimed in claim 1, wherein the point light source is selected from a group consisting of LED, mercury lamp and halogen lamp. 4. The direct point-light type backlight module as claimed in claim 1, wherein the dot element density is radially variable with a maximum proximal to a center point and decreases radially therefrom. 5. The direct point-light type backlight module as claimed in claim 1, wherein the diffuser has a top surface and a lower surface, and the dot elements are disposed on at least one surface of the diffuser. 6. The direct point-light type backlight module as claimed in claim 1, wherein at least one dot element has a given shape, the given shape selected from the set of shapes comprising convex and concave. 7. The direct point-light type backlight module as claimed in claim 1, wherein the diffuser is made using a material selected from a group consisting of glass, acrylic resin, polymethyl methacrylate (PMMA), polycarbonate (PC) and Arton, polyethylene terephthalate (PET). 8. The direct point-light type backlight module as claimed in claim 1, wherein the dot elements are formed using a reflective material selected from a group consisting of titanium (Ti) compound, silicon (Si) compound and BaSO4. 9. A method for manufacturing a direct point-light type backlight module, comprising following steps: forming a plurality of point light sources; forming a reflector reflects lights that are supplied by the light sources; and forming a diffuser having a plurality of dot elements which are formed thereon and compose a plurality of radially variable dot specific patterns; wherein each dot specific pattern defines a center portion thereof and at least one of the point light sources is aligned to the center portion of one of the radially random dot specific patterns. 10. The method as claimed in claim 9, wherein the reflector having a plurality of openings respectively positioned in relation to the point light sources. 11. The method as claimed in claim 9, wherein the point light source is selected from a group consisting of LED, mercury lamp and halogen lamp. 12. The method as claimed in claim 9, wherein for a given dot specific pattern, the distribution of the dot elements is a local maximum proximal to the center portion of the given dot specific pattern and diminishes radially therefrom. 13. The method as claimed in claim 9, wherein the diffuser has a top surface and a lower surface, and the dot elements are disposed at least one surface of the diffuser. 14. The method as claimed in claim 9, wherein the diffuser is made using a material selected from a group consisting of glass, acrylic resin, polymethyl methacrylate (PMMA), polycarbonate (PC) and Arton, polyethylene terephthalate (PET). 15. The method as claimed in claim 9, wherein the dot elements are formed by a reflective material selected from a group consisting of titanium (Ti) compound, silicon (Si) compound and BaSO4. 16. The method as claimed in claim 9, wherein the dot elements are formed on the diffuser by screen printing technology. 17. The method as claimed in claim 9, wherein the plurality of dot elements are formed on the diffuser by following steps: molding the diffuser which has the dot specific patterns formed thereon; and coating the diffuser with a reflective material, thereby forming the plurality of dot elements. 18. A liquid crystal display device comprising: a liquid crystal panel having two substrates and a liquid crystal material sealed therebetween; a backlight module disposed under the liquid crystal panel; and a display case for housing the liquid crystal panel and the backlight module; wherein the backlight module is a direct point-light type and comprises: a plurality of point light sources; a reflector reflects lights that are supplied by the light sources; and a diffuser having a plurality of dot elements which are formed thereon and compose a radially variable dot specific pattern; wherein the radially random dot specific pattern defines a center portion thereof and at least one of the point light sources is corresponding to the center portion of the radially random dot specific pattern. 19. The liquid crystal display device as claimed in claim 18, wherein the reflector having a plurality of openings respectively positioned in relation to the point light sources. 20. The liquid crystal display device as claimed in claim 18, wherein the point light source is selected from a group consisting of LED, mercury lamp and halogen lamp. 21. The liquid crystal display device as claimed in claim 18, wherein the distribution of the dot elements is a local maximum proximal to the center portion of the at least one dot specific pattern and diminishes radially therefrom. 22. The liquid crystal display device as claimed in claim 18, wherein the diffuser has a top surface and a lower surface, and the dot elements are disposed on at least one surface of the diffuser. 23. A liquid crystal display device comprising: a liquid crystal panel having two substrates and a liquid crystal material sealed therebetween; a backlight module disposed under the liquid crystal panel; and a display case for housing the liquid crystal panel and the backlight module; wherein the backlight module is a direct point-light type and comprises: a point light source that emits light; and a diffuser that receives light directly from the light source, the diffuser having plurality of dot elements that define a first dot specific pattern centered upon a center point, the dot specific pattern has a local maximum dot element density proximal to the center point and the dot element density radially diminishes therefrom. 24. The liquid crystal display device of claim 23, wherein the dot elements are azimuthly randomly disposed in the dot specific pattern. 25. The liquid crystal display device of claim 23, wherein the light intensity from the light source is non-uniform such that a region of the diffuser directly receives local high intensity light from the light source, and the center point is approximately coincident with the region of the diffuser receiving high intensity light directly from the light source. 26. The liquid crystal display device of claim 23, further including: a second point light source that emits light, wherein the plurality of dot elements defining a second dot specific pattern centered upon a second center point, the second dot specific pattern has a local maximum dot element density proximal to the second center point and the dot element density of the second dot specific pattern radially diminishes therefrom. 27. The liquid crystal display device of claim 26, wherein the first center point is aligned relative to the first point light source, and the second center point is aligned relative to the second point light source.