Liquid crystal display device
A liquid crystal display device and display surface technology, which is applied to instruments, nonlinear optics, optics, etc., can solve the problems of non-emitting electrodes, reduced brightness, uneven brightness distribution, etc. The effect of peripheral luminous intensity
Inactive Publication Date: 2011-07-27
HITACHT MAXELL LTD
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Problems solved by technology
Thinning of the direct-type BLU, that is, when shortening the distance between the optical part and the mirror, there is a problem of uneven brightness distribution on the display surface of the liquid crystal display panel
The uneven luminance distribution is particularly noticeable at the end faces of the liquid crystal display panel, and there is a problem that the luminance of both end faces in the longitudinal direction of the linear light source decreases
[0007] The unevenness of the above-mentioned luminance distribution is particularly noticeable at the end faces of the liquid crystal display panel, and there is a problem that the luminance of both end faces in the longitudinal direction of a linear light source (such as EEFL (External Electrode Fluorescent Lamp: External Electrode Fluorescent Lamp) etc.) decreases.
In addition, when the electrodes located at both ends or one end of the linear light source in the longitudinal direction are within the effective range of the BLU, the electrodes do not emit light, so it is seen that this is a dark part, and the problem of uneven brightness occurs.
Method used
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Embodiment Construction
[0036] Embodiments of the present invention will be described below using the drawings. figure 1 It is a model diagram illustrating a structural example of a liquid crystal display device equipped with a direct-type backlight. figure 1 (a) is a developed perspective view showing only the backlight, figure 1 (b) used to state that the figure 1 Partial cross-sectional view of the linear light source and the right-angle direction in the state where the backlight of (a) is combined in the liquid crystal panel, figure 1 (c) means figure 1 (a) Partial cross-sectional view of linear light source and parallel orientation.
[0037] like figure 1 As shown in (a), the backlight 1 of the direct type at least comprises: a frame 2 having side walls 2b and 2c standing upright from each pair of parallel end edges of a rectangular bottom plate 2a toward the direction of the liquid crystal panel; On the inner bottom of the bottom plate 2a of the frame 2, a linear light source 3 is installe...
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A direct type backlight unit used in a liquid crystal display device is provided which can suppress lowering of luminance at an electrode portion of a linear light source. A reflecting plate is formed on a side wall of a box-shaped reflector close to an end of a linear light source. The reflector reflects light beams from the linear light source to be guided toward a liquid crystal panel. The reflecting plate on the side wall has at least two inclined surfaces. The inclined surfaces may have a stepped shape or a convex ridge shape. According to this arrangement, it is possible to reduce or eliminate decrease of the luminance level at ends of an effective display area of a liquid crystal panel.
Description
technical field [0001] The present invention relates to a liquid crystal display device, in particular to a direct-type backlight unit used in the liquid crystal display device and a liquid crystal display device having the backlight unit. Background technique [0002] As a liquid crystal panel used in a liquid crystal display device, an active matrix type using a simple matrix row, a TFT (Thin Film Transistor: Thin Film Transistor), or the like is known. However, since such a liquid crystal panel is not a self-luminous type, a separate illumination light source is required in order to visualize an image formed on the liquid crystal panel. [0003] Therefore, a liquid crystal display device is composed of a liquid crystal display panel around which drain drivers and gate drivers are arranged, and a backlight unit (hereinafter, the backlight unit is referred to as BLU) that illuminates the liquid crystal display panel. [0004] The BLU includes a photometric type BLU and a d...
Claims
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IPC IPC(8): G02F1/13357F21V3/00
Inventor村田诚治都留康隆大内敏长吉真弓
OwnerHITACHT MAXELL LTD