CN200993709Y

CN200993709Y - Backlight module

Info

Publication number: CN200993709Y
Application number: CN 200620162363
Authority: CN
Inventors: 崔品静
Original assignee: SVA Group Co Ltd
Current assignee: SVA Optronics Co Ltd; SVA Group Co Ltd
Priority date: 2006-12-27
Filing date: 2006-12-27
Publication date: 2007-12-19
Anticipated expiration: 2016-12-27

Abstract

The utility model discloses a backlight module, which comprises a diffusion unit composed of a plurality of optical films; a luminous element distributed beneath the diffusion unit; a reflector positioned beneath the luminous element and a metal backboard positioned beneath the reflector. The reflector can be folded to at least an angle of Theta (Theta is more than 0 degree and less than 180 degree). The utility model changes the direction of the light shining on the diffusion unit through the reflection of the reflector and improves the utilization rate of the light, thereby improving the brightness and uniformity of the backlight module.

Description

Module backlight

Technical field

The utility model relates to a kind of module backlight, particularly relates to a kind ofly reducing light-emitting component quantity, improve briliancy, improving all modules backlight of degree together of briliancy.

Background technology

(Back Light Module BLM) is one of key part and component of liquid crystal display (LCD) panel to module backlight, because liquid crystal itself is not had a characteristics of luminescence, therefore, must module displays image backlight be installed at the LCD back side of panel.Can be divided into side-light type and straight-down negative (end light formula) according to the different modules backlight in distribution of light sources position, the light-emitting component that present down straight aphototropism mode set is suitable for generally includes following two kinds: the one, by a plurality of light emitting diodes (Light EmittingDiode, LED) form with the matrix-style arrangement, another kind of mode is by a plurality of cathode fluorescent tubes (Cold Cathode Fluorescent Lamp, CCFL), thermal cathode fluorescent tube (HotCathode Fluorescent Lamp, HCFL) or external electrode fluorescent lamp (ExternalElectrode Fluorescent Lamp EEFL) equidistantly is arranged in parallel and forms.

The synoptic diagram of at present general down straight aphototropism mode set as shown in Figure 1, Fig. 2 be Fig. 1 vertically center V1-V1 cut open the section structure synoptic diagram, module backlight is by a metal backing 1, the cathode fluorescent tube 31 of a parallel reflector plate (reflector) 2, a plurality of parallel equidistant arrangements and a diffusion unit (diffusing Unit) 4 constitutes, the light that cathode fluorescent tube 31 is sent by reflector plate 2 reflections or direct irradiation to diffusion unit 4.The back light module unit structure of the parallel equidistant arrangement of this a plurality of cathode fluorescent tubes, the parallel equidistant arrangement of a plurality of cathode fluorescent tubes on the one hand, the utilization factor of light is not high, cause briliancy to reduce, can not reach requirement, also need increase fluorescent tube or increment diaphragm, cause cost to improve.The briliancy of close area just above presents the even phenomenon of bright, dark luminance nonuniformity than the briliancy height in zone between fluorescent tube on the other hand.

Summary of the invention

Therefore, the purpose of this utility model is to provide a kind of module backlight that improves briliancy and equal Qi Dujia, to overcome the shortcoming of above-mentioned prior art.

For reaching above-mentioned purpose, the utility model provides a kind of module backlight, comprises a diffusion unit, includes several pieces of blooming pieces; Light-emitting component, be distributed in diffusion unit below; Reflector plate, be arranged on light-emitting component below; One metal backing places below the reflector plate; Wherein said reflector plate is converted at least one θ angle, 0 °＜θ＜180 °.

Described light-emitting component is arranged in parallel by a plurality of cathode fluorescent tube non-equidistances and forms.

Based on above-mentioned design, module backlight of the present utility model is owing to be converted into one less than 180 ° θ angle with reflector plate, changed through the reflector plate reflection to beat direction at the diffusion unit glazed thread, improved the utilization factor of light, thereby improved the briliancy of module backlight; Therefore, under the situation that reaches same briliancy specification, the traditional backlight module of comparing can reduce the quantity of fluorescent tube or avoid using brightening film sheet, has reduced cost; In addition, fluorescent tube is carried out non-equidistance when arranging, the reflector plate of bottom is converted into one less than 180 ° θ angle, changed through the reflector plate reflection and beaten direction, remedied the luminance nonuniformity phenomenon, improved the briliancy of module backlight and all spent together at the diffusion unit glazed thread.

Description of drawings

Fig. 1 is the overall schematic of module backlight;

Fig. 2 is along the sectional schematic diagram of the existing module backlight of V1-V1 direction among Fig. 1;

Fig. 3 is that the fluorescent tube non-equidistance is arranged the vertical direction section structure synoptic diagram that the θ angle is 180 modules backlight when spending;

Fig. 4 is the vertical direction section structure synoptic diagram of module backlight among the utility model embodiment;

Fig. 5 is the analog result contrast figure that the briliancy of the utility model Fig. 4, Fig. 3 and existing structure module vertical direction backlight sectional drawing 2 distributes.

Description of reference numerals:

1, metal backing 2, reflector plate 3, light-emitting component 4, diffusion unit 31, cathode fluorescent tube

Embodiment

Below contrast accompanying drawing, the utility model is further described by embodiment.

Fig. 4 is the vertical direction section structure synoptic diagram of present embodiment module backlight.

With reference to Fig. 4, back light module group comprises a diffusion unit 4, is made up of several pieces of blooming pieces, as diffuser plate, diffusion sheet or prismatic lens (not illustrating among the figure); Light-emitting component 3, be distributed in diffusion unit 4 below; Reflector plate 2, be arranged on light-emitting component 3 below; One metal backing 1 places below the reflector plate 2, and light-emitting component 3 is formed by a plurality of cathode fluorescent tube 31 non-equidistant being arranged in parallel, with tolerance be 1 arithmetic progression spacing from the centre to the both sides symmetric offset spread; Reflector plate 2 is converted into a θ angle, and 0 °＜θ＜180 °, better scope is 120 °≤θ＜180 °, and optimum range is 140 °≤θ＜180 °, and the θ angle of present embodiment is 149 °.In like manner, can also as required reflector plate 2 be converted into the θ angle of a plurality of 0 °＜θ＜180 °.

Light-emitting component 3 can also be formed by thermal cathode fluorescent tube or non-equidistant being arranged in parallel of external electrode fluorescent lamp.

With reference to Fig. 5, cathode fluorescent tube shown in Figure 2 equidistantly is arranged in parallel and reflector plate θ angle is 180 ° a module existing backlight, cathode fluorescent tube non-equidistance shown in Figure 3 is arranged in parallel and reflector plate θ angle is 180 ° a module backlight and cathode fluorescent tube non-equidistance shown in Figure 4 is arranged in parallel and reflector plate θ angle is that the brightness value of 149 ° module backlight is simulated comparison, the module backlight of the utility model embodiment is higher by 3～5% than the brightness value that existing structure produces as can be seen, thereby can reduce fluorescent tube or reduce diaphragm quantity, reduce cost, and with the cathode fluorescent tube non-equidistance reflector plate θ angle that is arranged in parallel is that 180 ° module backlight is compared, and briliancy is more even.Therefore, the module backlight of said structure has good all spending together when improving briliancy.

Claims

1. a module backlight comprises

One diffusion unit includes several pieces of blooming pieces;

Light-emitting component, be distributed in diffusion unit below;

Reflector plate, be arranged on light-emitting component below;

One metal backing places below the reflector plate;

It is characterized in that described reflector plate is converted at least one θ angle, 0 °＜θ＜180 °.

2. module backlight according to claim 1 is characterized in that described light-emitting component is arranged in parallel by a plurality of cathode fluorescent tube non-equidistances to form.

3. module backlight according to claim 2 is characterized in that described cathode fluorescent tube is left-right symmetric and arranges.

4. module backlight according to claim 1, the scope that it is characterized in that described θ angle are 120≤θ＜180 °.

5. module backlight according to claim 4, the scope that it is characterized in that described θ angle are 140≤θ＜180 °.

6. module backlight according to claim 1 is characterized in that described blooming piece is the blooming piece with diffusion or light-focusing function.