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Display device lighting unit

a technology for display devices and lighting units, which is applied to lighting support devices, instruments, applications, etc., can solve the problems of increasing electrical consumption, increasing total heat generation, and affecting display quality or reliability, and achieves the effects of reducing the number of LEDs

Inactive Publication Date: 2013-05-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a way to improve the brightness and uniformity of a lighting unit used in display devices. The invention involves reducing the area of contact between a light source lamp and the relevant supporting member of the lamp holder, which can help to achieve a more uniform temperature distribution. This can be achieved by adding projections to the supporting members or using a low-thermal conductivity material. The lamp holder also includes fixing members that can securely hold the light source lamp in place, preventing any deviation in mounting position. The use of a soft material, such as silicone rubber, can result in weak confincing force, leading to potential shifting in the X and Y axes. However, using a more rigid material, such as polycarbonate, can allow for shifting in the X and Y axis directions. Overall, the invention aims to improve the stability and display quality of the lighting unit.

Problems solved by technology

Furthermore, the electricity consumption increases, and the total heat generation becomes increased.
However, there is still room for contrivance for adapting these devices to the field of liquid crystal displays, among others, where higher quality and larger sizes are required for improving the commercial value thereof and at the same time reductions in cost are required.
With devices of this kind, however, deviations may result in the step of mounting lamps and such deviations may influence the display quality or reliability.

Method used

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Examples

Experimental program
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Effect test

example 1

[0133]A lighting unit was constituted by placing, in the display region of a liquid crystal display device having a lighting unit at the back of the liquid crystal display element, a white lamp holder 11 made of an insulating resin and morphologically capable of supporting a plurality of straight tube type fluorescent tubes 12 on a highly reflecting resin 112 and disposing a plurality of straight tube type fluorescent tubes 12 thereon in parallel and at regular intervals, as shown in FIG. 1.

[0134]In this example and the subsequent examples, the shape, material, number and positions of the lamp holders made of an insulating resin are not restricted in any way in the modes of embodiment of the invention. The liquid crystal display device may have either a direct type backlight or an edge light type backlight having a U-shaped lamp or a plurality of U-shaped lamps.

[0135]According to such constitution, lamps are supported by a lamp holder resulting from integration of a plurality of sup...

example 2

[0136]A lighting unit was constituted by disposing, in the non-display region of a liquid crystal display device having a lighting unit at the back of a liquid crystal display element, the supporting members of a lamp holder 22 made of an insulating resin and morphologically capable of supporting a plurality of U-shaped fluorescent tubes (U-shaped tube light source lamps) 21 on a sheet metal 111 and disposing U-shaped fluorescent tubes 21 thereon in parallel and at regular intervals, as shown in FIG. 2.

[0137]According to such constitution, lamps are supported by a lamp holder resulting from integration of a plurality of supporting members into one piece and therefore the number of parts can be reduced and, further, light source lamps can be disposed precisely at regular intervals; thus, liquid crystal display devices excellent in display quality can be provided at low cost.

example 3

[0138]On the occasion of inserting the U-shaped curved portion of a U-shaped fluorescent tube 21, which is the light source lamp, into a housing frame 41 in the section for housing the fluorescent tube 21 into the housing frame 41 in a liquid crystal display device having a lighting unit at the back of a liquid crystal display element, the U-shaped curved portion of the U-shaped fluorescent tube 21 was supported by a lamp holder 31, 33, 34 or 35 made of an insulating resin and inserted, in that state, into the housing frame 41, as shown in FIG. 3. A lighting unit was thus constituted.

[0139]According to such constitution, that portion of a U-shaped fluorescent tube which is to be housed in a housing frame is housed via a lamp holder made of an insulating resin, so that the U-shaped curved portion of the U-shaped fluorescent tube can be prevented from coming into contact with the housing frame; a good liquid crystal display device can thus be provided.

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Abstract

The display device lighting unit comprises a light source lamp and a lamp holder, which has one or an arbitrary combination of the following features: (1) the lamp holder comprises a plurality of supporting members at least partly integrated, (2) the light source lamp or lamps have a curved portion and each is supported by supporting members of the lamp holder or holders at least partly at the respective curved portions, (3) the lamp holder has, for example, projections, depressions and so on that reduces the supporting area of the supporting members, (4) means for fixing the lamp holder within the display device lighting unit after the fixation of light source lamp on the supporting members of the lamp holder or holders in which at least one fixing member of the lamp holder or holders have a structure resulting from division into two.

Description

REFERENCE TO RELATED APPLICATIONS[0001]This Nonprovisional application claims priority Under 35 U.S.C. §119(a) on Patent Application No. 2004-6997 filed in Japan on Jan. 14, 2004, No. 2004-223957 filed in Japan on Jul. 30, 2004, and No. 2004-343134 filed in Japan on Nov. 26, 2004, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a display device lighting unit, a lamp holder and a liquid crystal display device. More particularly, it relates to a display device lighting unit and a lamp holding system therefor, which are suited for use in constituting a backlight for a liquid crystal display device of the transmission or semitransmission type having a transmission region in the liquid crystal display element and to a liquid crystal display device equipped with the display device lighting unit.[0004]2. Prior Art[0005]A display device lighting unit illuminates a device having...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F21V19/00F21V21/00F21V21/08F21Y103/37G02F1/1335G02F1/13357
CPCG02F1/133604A23L7/10A23P30/00B65G33/265B65G33/18
Inventor ONO, SATOSHITAKEGUCHI, MITSUHIRO
Owner SHARP KK
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