Backlight assembly and liquid crystal display device using the same
a backlight assembly and liquid crystal display technology, applied in fixed installation, lighting and heating equipment, instruments, etc., can solve the problems of non-uniform brightness, increase in thickness and volume of lcd devices, and drawbacks of conventional direct-illuminating type lcd devices, so as to optimize brightness and minimize thickness and volume of backlight assemblies
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first embodiment
[0032]FIG. 1 is a plan view of a backlight assembly according to the present invention, and FIG. 2 is a sectional view taken along line A-A of FIG. 1.
[0033] Referring to FIG. 2, a backlight assembly 100 includes a receiving container 110, a plurality of lamps 120, and an optical plate 130. The reference numeral 140 represents a reflection plate. The reflection plate 140 is installed in the receiving container 110, and reflects the light generated from the lamps 120 toward the optical plate 130.
[0034] The receiving container 110 also includes a receiving frame 115 and a bottom chassis 119.
[0035] Referring to FIG. 1, the receiving frame 115 is comprised of four sidewalls 111a, 111b, 111c, 111d connected with each other. Ends of the lamps 120 are connected to sidewalls 111b and 111d of the receiving frame 115.
[0036] The bottom chassis 119 is comprised of a rectangular bottom plate 116 and a bottom chassis sidewall 117 extended from edges of the bottom plate 116.
[0037]FIG. 3 is a se...
second embodiment
[0063]FIG. 4 is a sectional view of a backlight assembly according to the present invention;
[0064] Referring to FIG. 4 and table 2, when two optical sheets 133 are added on the optical plate 130, the evaluation of the bright line is relatively better (i.e., weaker bright line) compared with the case of one optical sheet shown in table 1, and the brightness is also relatively increased.
[0065] Specifically, in case that the pitch of the lamps and the gap are adjusted to have the bright line prevention ratio of about 2.0 and the optical plate 130 and two optical sheets are used together, the bright line has an intensity that is enough at least to display images. The brightness increases by about 30% or more compared with the case that the optical plate 130 alone is used, so that the display quality is enhanced.
[0066] In case that the pitch of the lamps 120 has a constant value and the gap is adjusted to have a bright line prevention ratio of about 2.3, 1.9 or 1.7, and the optical pla...
third embodiment
[0068]FIG. 5 is a sectional view of a backlight assembly according to the present invention.
[0069] Referring to FIG. 5, a brightness-enhanced film (BEF) or a dual brightness-enhanced film (DBEF that is the trademark of a product manufactured by 3M company (Minnesota Mining and Manufacturing company, St. Paul, Minn.)) 135 may be further installed in the backlight assembly 100 when at least one optical sheet is stacked on the optical plate 130, to prevent the light from being absorbed in a lower polarizing plate of the LCD panel and to prevent the brightness from being lowered. It is noted that both the brightness-enhanced film and the dual brightness-enhanced film may be used together.
[0070] In an exemplary embodiment of the present invention shown in table 3 below, a dual brightness-enhanced film is used.
[0071] The dual brightness-enhanced film 135 prevents the light from being absorbed in the lower polarizing plate placed on the backlight assembly of the LCD device. Also, the dua...
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