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  Backlight assembly and liquid crystal display device using the sameThe Patent Description & Claims data below is from USPTO Patent Application 20060209539. Brief Patent Description - Full Patent Description - Patent Application Claims
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 brightness, power consumption, and thickness and volume of the LCD device. [0006] Recently, the size of an LC control part considerably increases as the display area of an LCD device becomes larger. As a result, the amount of the light that is supplied from the light supply part to the LC control part also increases. [0007] Recently, there has been a development in the structure of an LCD device in which a plurality of light sources, for instance, cold cathode fluorescent lamps, are arranged in parallel below the LC control part in order to supply enough light to the increased area of the LC control part. The structure in which a plurality of light sources are arranged in parallel below the LC control part is called "direct-illuminating type LCD device". [0008] A conventional direct-illuminating type LCD device has an advantage in that a sufficient amount of light can be supplied to the LC control part. 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. [0009] In order to prevent the display quality from being deteriorated due to the non-uniform brightness, the conventional direct-illuminating type LCD device utilizes a light diffusion plate for diffusing the light generated from the light source. [0010] 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. The pitch is a distance between light sources (lamps), and the gap is a distance between the light sources and the light diffusion plate. [0011] Specifically, if the gap between the light sources and the light diffusion plate increases while the pitch between the light sources is fixed at a constant value in order to eliminate the bright lines, the brightness decreases abruptly, so that the display quality is seriously lowered. In this case, the thickness and the volume of the direct-illuminating type LCD device increase. [0012] 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. [0013] Also, if the pitch increases while the gap is fixed at a constant value, the brightness that influences display quality is largely lowered, so that the display quality is lowered. [0014] 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. SUMMARY OF THE INVENTION [0015] The present invention provides a backlight assembly having an optimized ratio of the pitch to the gap such that brightness, power consumption, thickness and volume are optimized, thereby realizing a high quality display. [0016] The present invention also provides an LCD device capable of realizing a high quality display using a backlight assembly having an optimized ratio of the pitch to the gap such that brightness, power consumption, thickness and volume are optimized. [0017] In one aspect of the invention, there is provided a backlight assembly comprising a receiving container, at least two lamps disposed in the receiving container, and an optical plate for enhancing brightness uniformity of light generated from the lamps, wherein the backlight assembly has a bright line prevention ratio of a pitch to a gap, the ratio being ranged from about 1.3 to about 2.0 so as to prevent a bright line generated from the lamps from being perceived outside the optical plate, the pitch being a distance between centers of two adjacent lamps, the gap being a distance between a center of the respective lamps and a surface of the optical plate, and the surface being opposite to the lamps. [0018] In another aspect of the present invention, there is provided a liquid crystal display device comprising a backlight assembly including: a receiving container; at least two lamps disposed in the receiving container, for generating a first light; and an optical plate being apart from centers of the lamps, for diffusing the first light to generate a second light having a uniform brightness distribution, wherein the backlight assembly has a bright line prevention ratio of a pitch to a gap in the range from about 1.3 to about 2.8 so as to prevent a bright line of the first light from being perceived outside the optical plate, the pitch is a distance between centers of two adjacent lamps, the gap is a distance between a center of the respective lamps and a surface of the optical plate, and the surface is opposite to the lamps. The liquid crystal display device also includes a liquid crystal display panel assembly received in the receiving container, for displaying images using a second light diffused by the optical plate; and a chassis for fixing the liquid crystal display panel assembly to the receiving container. [0019] According to the present invention, the pitch and the gap are precisely controlled to minimize thickness and volume of the backlight assembly, to allow the bright line of the lamp not to be shown, and to provide optimized brightness. BRIEF DESCRIPTION OF THE DRAWINGS [0020] The objects and advantages of the present invention will become more apparent by describing in detail the preferred embodiments thereof with reference to the accompanying drawings, in which: [0021] FIG. 1 is a plan view of a backlight assembly according to a first embodiment of the present invention; Continue reading... Full patent description for Backlight assembly and liquid crystal display device using the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Backlight assembly and liquid crystal display device using the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Backlight assembly and liquid crystal display device using the same or other areas of interest. ### Previous Patent Application: Backlight modules Next Patent Application: Beacon light with light-transmitting element and light-emitting diodes Industry Class: Illumination ### FreshPatents.com Support Thank you for viewing the Backlight assembly and liquid crystal display device using the same patent info. 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