CN100357805C

CN100357805C - Direct Type Backlight Module

Info

Publication number: CN100357805C
Application number: CNB2005100059580A
Authority: CN
Inventors: 李思汉; 苏宏文; 陈君明; 田謦辅; 刘耕儒; 庄永彬
Original assignee: Quanta Display Inc
Current assignee: AUO Corp
Priority date: 2005-01-31
Filing date: 2005-01-31
Publication date: 2007-12-26
Anticipated expiration: 2025-01-31
Also published as: CN1645211A

Abstract

A direct type backlight module comprises a bottom plate, a reflecting plate and a plurality of lighting tubes. The bottom plate is provided with a bottom edge, a first side edge, a second side edge, a first opening and a second opening, the first side edge is opposite to the second side edge, the bottom edge is connected between the first side edge and the second side edge, the first opening is formed between the first side edge and the bottom edge, and the second opening is formed between the second side edge and the bottom edge. The reflecting plate is arranged on the bottom plate and located between the first opening and the second opening, the reflecting plate is provided with at least one first reflecting part and at least two second reflecting parts, and the first reflecting part is connected between the two second reflecting parts. The lighting lamp tubes are respectively arranged on the second reflecting parts, and heat generated by the lighting lamp tubes is transferred to the outside of the bottom plate through the first opening or the second opening by air convection.

Description

Direct type backlight module

Technical field

The present invention relates to a kind of direct type backlight module, relate in particular to a kind of direct type backlight module that improves radiating effect more.

Background technology

In general, in the direct type backlight module of LCD, can produce heat during its lamp luminescence, and along with the increase of its fluorescent tube number, the temperature of direct type backlight module also can be followed significantly and raise.Yet the temperature of direct type backlight module significantly raises and will cause its briliancy to reduce, and then reduces the light utilization of direct type backlight module, and therefore, the design radiator structure reduces its temperature in direct type backlight module has become important problem.

The TaiWan, China patent discloses a kind of liquid crystal indicator No. 534424, and the heat that its backlight module produced is released in the external environment via perforate set on the shell.

With reference to Fig. 1, in No. the 542883rd, TaiWan, China patent, disclose a kind of backlight module 50, it offers first couple of discharge orifice 62a and second pair of discharge orifice 64 on the reflecting plate below the fluorescent tube 14 58, therefore the heat that fluorescent tube 14 produced can be passed on the heat sink 59 by the cross-ventilation effect, and then conducts in the external environment via the fin structure 54a that is connected in heat sink 59.Yet, because the cross-ventilation effect only is the inside that betides backlight module 50, so its radiating effect is limited.

With reference to Fig. 2, in No. the 564302nd, TaiWan, China patent, disclose another kind of backlight module 410, the plane that its wavy reflecting plate 418 is positioned at below the fluorescent tube L partly is provided with opening 430, so the heat that fluorescent tube L produced can be passed on the fin-shaped backboard 500 by the cross-ventilation effect, and then conducts in the external environment.Similarly, because the cross-ventilation effect only is the inside that occurs in backlight module 410, so its radiating effect is still limited.

Summary of the invention

The present invention adopts feature as detailed below basically, to address the above problem.That is to say, the present invention includes a base plate, have a base, a first side, a second side, first opening and one second opening, wherein, this first side is relative with this second side, this base is connected between this first side and this second side, and this first opening forms between this first side and this base, and this second opening forms between this second side and this base; A reflecting plate, be arranged on this base plate, and between this first opening and this second opening, wherein, this reflecting plate has at least one first reflecting part and at least two second reflecting parts, this first reflecting part is connected between these second reflecting parts, this first reflecting part is a three-pointed hollow star teat, also have one first open-work and one second open-work, this first open-work and this second open-work form on the dual-side of this three-pointed hollow star teat with symmetric mode; And a plurality of illuminating lamp tubes, be arranged at respectively on these second reflecting parts, wherein, the light that these illuminating lamp tubes sent is by this first reflecting part and the reflection of these second reflecting part branch, and the heat that these illuminating lamp tubes produced is passed to outside this base plate via this first opening or this second opening by the cross-ventilation effect.Simultaneously, according to direct type backlight module of the present invention, these second reflecting parts have dull and stereotyped shape.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly and conjunction with figs. elaborate.

Description of drawings

Fig. 1 is for showing a kind of diagrammatic cross-section of known backlight module;

Fig. 2 is for showing the diagrammatic cross-section of another kind of known backlight module;

Fig. 3 A is the schematic top plan view of the direct type backlight module of demonstration first embodiment of the present invention;

Fig. 3 B is for showing the A-A diagrammatic cross-section according to Fig. 3 A;

Fig. 4 A is the schematic top plan view of the direct type backlight module of demonstration second embodiment of the present invention; And

Fig. 4 B is for showing the A '-A ' diagrammatic cross-section according to Fig. 4 A.

Embodiment

The preferred embodiments of the present invention of conjunction with figs. explanation here.

First embodiment

With reference to Fig. 3 A and Fig. 3 B, the direct type backlight module 100 of present embodiment mainly includes a base plate 110, a reflecting plate 120 and an a plurality of illuminating lamp tube 130.

Base plate 110 has a base 111, first side 112, second side 113, a plurality of first opening 114 and a plurality of second opening 115.Shown in Fig. 3 B, first side 112 is relative with second side 113, and base 111 is connected between first side 112 and the second side 113.Among present embodiment, each first opening 114 forms in (or on the junction on first side 112 and base 111) between first side 112 and the base 111, and each second opening 115 then forms in (or on the junction on second side 113 and base 111) between second side 113 and the base 111.

Reflecting plate 120 is arranged on the base plate 110, and reflecting plate 120 is between first opening 114 and second opening 115.In addition, reflecting plate 120 is made of a plurality of spaced first reflecting parts 121 and second reflecting part 122, and in other words, each first reflecting part 121 all is to be connected between (or being positioned at) two second reflecting parts 122.Specifically, each first reflecting part 121 is all a three-pointed hollow star teat, and each second reflecting part 122 then has the shape of a flat board.In addition, each first reflecting part 121 also has a plurality of first open-work 121a and a plurality of second open-work 121b.Shown in 3B figure, the first open-work 121a and the second open-work 121b form on the dual-side of three-pointed hollow star teat with symmetric mode.

Each illuminating lamp tube 130 all is to be arranged on each second reflecting part 122.

When direct type backlight module 100 runnings, the light that illuminating lamp tube 130 sent can be reflected by first reflecting part 121 and second reflecting part 122.The more important thing is that the heat that illuminating lamp tube 130 is produced when luminous can and be passed to outside the base plate 110 via first opening 114 or second opening 115 by cross-ventilation (or thermal convection) effect.For instance, when cross-ventilation (or thermal convection) takes place, the air of external environment can be via among first opening, the 114 inflow direct type backlight modules 100, air can flow through the first open-work 121a and the second open-work 121b of each first reflecting part 121 in regular turn and flow through the top of all first reflecting parts 121 and second reflecting part 122 then, and last air flow in the external environment via second opening 115 again.As mentioned above, because air can fully circulate between the inside and external environment of direct type backlight module 100, so the heat that illuminating lamp tube 130 is produced can be removed effectively, thereby the temperature of direct type backlight module 100 is reduced, and its briliancy is promoted.

Second embodiment

In the present embodiment, identical with first embodiment assembly all indicates with identical Reference numeral.

With reference to Fig. 4 A and Fig. 4 B, the difference of the present embodiment and the first embodiment maximum is to be that first opening 114 of present embodiment and second opening 115 are to be formed separately on first side 112 and second side 113.Other component construction or feature as for present embodiment are all identical with first embodiment, therefore for the content that makes present specification can be more clear understandable, omit the explanation of its repetition at this.

Similarly, when direct type backlight module 100 ' work, the heat that illuminating lamp tube 130 is produced when luminous can and be passed to outside the base plate 110 via first opening 114 or second opening 115 by cross-ventilation (or thermal convection) effect, and wherein the mode of air flow is identical with the described mode of first embodiment.Therefore, the heat that illuminating lamp tube 130 is produced can be removed effectively, thereby the temperature of direct type backlight module 100 ' is reduced, and its briliancy is promoted.

Though the present invention is disclosed in preferred embodiment; yet these preferred embodiments are not in order to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make certain modification and retouching, so protection scope of the present invention should be as the criterion with back claims institute restricted portion.

Claims

1. direct type backlight module comprises:

A base plate, have a base, a first side, a second side, first opening and one second opening, wherein, this first side is relative with this second side, this base is connected between this first side and this second side, this first opening forms between this first side and this base, and this second opening forms between this second side and this base;

A reflecting plate, be arranged on this base plate, and between this first opening and this second opening, wherein, this reflecting plate has at least one first reflecting part and at least two second reflecting parts, this first reflecting part is connected between these second reflecting parts, wherein this first reflecting part is a three-pointed hollow star teat, also have one first open-work and one second open-work, this first open-work and this second open-work form on the dual-side of this three-pointed hollow star teat with symmetric mode; And

A plurality of illuminating lamp tubes, be arranged at respectively on these second reflecting parts, wherein, the light that these illuminating lamp tubes sent is by this first reflecting part and the reflection of these second reflecting part branch, and the heat that these illuminating lamp tubes produced is passed to outside this base plate via this first opening or this second opening by the cross-ventilation effect.

2. direct type backlight module as claimed in claim 1, wherein, these second reflecting parts have dull and stereotyped shape.

3. direct type backlight module comprises:

A base plate, have a first side, a second side, first opening and one second opening, wherein, this first side is relative with this second side, this first opening forms on this first side, and this second opening forms on this second side;

4. direct type backlight module as claimed in claim 3, wherein, these second reflecting parts have dull and stereotyped shape.