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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

Inactive Publication Date: 2006-09-21
LEE KEUN WOO +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a backlight assembly and an LCD device that use an optimized ratio of the pitch to the gap to achieve high quality display. This ratio prevents bright lines from being perceived outside the optical plate and ensures uniform brightness distribution. The invention also minimizes the thickness and volume of the backlight assembly, allowing for optimized brightness. The technical effects of the invention include improved display quality and reduced power consumption.

Problems solved by technology

However, the conventional direct-illuminating type LCD device also has disadvantages in that the brightness becomes non-uniform and the thickness and volume of the LCD device increase.
However, even though the light diffusion plate is used, the conventional direct-illuminating type LCD device still has the drawback in that bright lines generated from the lamps are shown from the outside of the light diffusion plate depending upon a pitch and a gap.
On the contrary, if the gap decreases while the pitch is fixed at a constant value, the problem due to brightness is solved, but bright lines are shown and are perceived by a user, so that display failure occurs.
On the contrary, if the pitch decreases while the gap is fixed at a constant value, the brightness is largely enhanced, but the number of the bright lines increases and power consumption increases.

Method used

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  • Backlight assembly and liquid crystal display device using the same
  • Backlight assembly and liquid crystal display device using the same
  • Backlight assembly and liquid crystal display device using the same

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

Disclosed are a backlight assembly and a liquid crystal display device using the same. A ratio of a pitch, which is an interval between the lamps for supplying light to an LCD panel, to a gap, which is a distance between the center of the lamps and an optical plate, is adjusted to thereby minimize the bright line that badly influences the image display quality, so as to display a high quality image.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The disclosure relates to a backlight assembly and a liquid crystal display device using the same, and more particularly to a backlight assembly and a liquid crystal display device using the same in which bright lines generated from lamps arranged in parallel are prevented, while its volume and thickness are minimized and brightness is maximized. [0003] 2. Description of the Related Art [0004] Generally, a liquid crystal display (LCD) device displays images using liquid crystal. Liquid crystal converts light that does not contain information into light containing information to display images. The LCD device includes a liquid crystal (LC) control part for precisely controlling the liquid crystal and a light supply part for supplying light to the LC control part. [0005] In particular, the light supply part greatly influences the display quality of the LCD device. Specifically, the light supply part influences display...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F21V1/00F21S2/00F21S4/00F21S8/04F21Y103/00G02F1/13357
CPCG02F1/133604G02F2001/133613G02F1/133605G02F1/133613G02F1/1335
Inventor LEE, KEUN-WOOPARK, JONG-DAEBANG, CHANG-YOUNGLEE, TAE-JINLEE, JAE-SANGLEE, JEONG-HWANJUNG, JAE-HOCHOI
Owner LEE KEUN WOO
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