CN101082734A

CN101082734A - Side light type back light module unit

Info

Publication number: CN101082734A
Application number: CN 200710043454
Authority: CN
Inventors: 胡秋霞
Original assignee: SVA Group Co Ltd
Current assignee: SVA Group Co Ltd
Priority date: 2007-07-05
Filing date: 2007-07-05
Publication date: 2007-12-05

Abstract

The invention discloses a side light typed aphototropism mould, which comprises the following parts: light conductive board with incidence face, which guides the transmitted light from tube; multiple tubes, which lie at one side of incidence face of light conductive board; at least one reflective lid, which is set at exterior of multiple tubes to reflect the light from tube to light conductive board, wherein the tube lies under the incidence face of light conductive board. The invention lessens the degradation of optical film due to heating, which can reduce the thickness of light conductive board fitfully to make the entire aphototropism mould lightly.

Description

Side-light type module backlight

Technical field

The present invention relates to a kind of module backlight, particularly a kind of side-light type module backlight that is used for LCD.

Background technology

LCD (LCD) is widely used in computer, communication apparatus, televisor and other various displays.General LCD mainly is made up of liquid crystal panel and module backlight.Wherein liquid crystal panel itself is not luminous, and the light source of panel is provided by module backlight.Module backlight can be divided into two kinds of side-light type and straight-down negatives according to the position at light source place.Because side-light type module backlight is placed on the side of display panels with light source, can dwindle the volume and the manufacturing cost of LCD, and be applied to small-sized liquid crystal display.

With reference to figure 1, Fig. 1 is the schematic cross-section of existing side-light type module backlight, comprises a backboard 5, is positioned at the bottom surface and the both sides of module backlight; One light guide plate 2 is positioned at backboard 5 inner bottom surfaces top, is used to the light that guides fluorescent tube 3 to produce; Several fluorescent tubes 3 are arranged in light guide plate 2 incidence surfaces 4 one sides, provide light source to display panel; One reflex housing 1 is located at the outside of fluorescent tube 3; One reflector plate 6 is located at light guide plate 2 belows and is fixed on the backboard 10; Reflex housing 1, reflector plate 6 are used for the light that fluorescent tube 3 produces is reflexed to the utilization rate of light guide plate 2 with increase light, and then preferable brightness output is provided; The top of light guide plate 2 is disposed with blooming pieces such as diffusion sheet 7, prismatic lens 8, diffusion sheet 9; Diffusion sheet 7,9 can be with the further scattering of light by light guide plate 2 reflections, light is distributed to display panel more uniformly, prismatic lens 8 can further be revised the difference of light intensity, makes light that one higher briliancy can be arranged, and the quantity of prismatic lens 8 and order can be set according to demand; Plastic cement frame 10 includes sidewall, combines with backboard 5, is used for fixing each assembly of module backlight.

Because fluorescent tube relatively is evenly distributed in light guide plate incidence surface one side and the reflex housing usually in the existing side-light type back light module unit structure, its position next-door neighbour's light guide plate and blooming piece, there is following shortcoming: the one, heat is difficult for shedding, cause easily that blooming piece curls because of being heated, deterioration, the 2nd, light utilization efficiency is lower, light guide plate is thicker, makes the weight of light guide plate account for bigger proportion in entire aphototropism mould.

Summary of the invention

Therefore, the technical matters that solves of the present invention provides a kind of good heat dissipation effect, can improve the side-light type module backlight of light utilization efficiency.

For achieving the above object, side-light type of the present invention module backlight comprises a light guide plate, is used to the light that guides fluorescent tube to emit, is provided with incidence surface; A plurality of fluorescent tubes are positioned at light guide plate incidence surface one side; At least one reflex housing is located at the outside of fluorescent tube, is used for the light that fluorescent tube produces is reflexed to light guide plate; Wherein said fluorescent tube is positioned at the side-lower of light guide plate incidence surface.

The top corner of described reflex housing is curved-surface structure.

Described fluorescent tube quantity is four, is arranged into delegation.

By side-light type of the present invention module backlight, because fluorescent tube is arranged on the side-lower of light guide plate incidence surface, and the distance between the blooming piece increases, and the heat backboard that effectively leads has alleviated the deterioration of being heated of blooming piece; And the arrangement mode of fluorescent tube has reduced the light absorption between the fluorescent tube, because the space of fluorescent tube top is bigger, the shape of reflex housing can be set as required again, with the utilization factor of raising light, thereby can reduce light guide plate in right amount, makes the entire aphototropism mould lightweight.

Description of drawings

Fig. 1 is the schematic cross-section of existing side-light type module backlight;

Fig. 2 is the schematic cross-section of the side-light type module backlight of the embodiment of the invention;

Fig. 3 is the structural representation of the side-light type module backlight of the embodiment of the invention.

Accompanying drawing part symbol description:

1,11: fluorescent tube reflex housing 2,12: light guide plate

3,13: fluorescent tube 4,14: incidence surface

5,15: backboard 6,16: reflector plate

7,17: diffusion sheet 8,18: prismatic lens

9,19: diffusion sheet 10,20: plastic cement frame

Embodiment

Below in conjunction with accompanying drawing the present invention is further described.

With reference to Fig. 2, Fig. 3, the side-light type of present embodiment module backlight comprises a backboard 15, is positioned at the bottom surface and the both sides of module backlight; One light guide plate 12 is positioned at backboard 15 inner bottom surfaces tops, is used to the light that guides fluorescent tube 13 to emit, is provided with incidence surface 14; Four fluorescent tubes 13 are positioned at the side-lower of light guide plate 12 incidence surfaces, are in line, and fluorescent tube can provide light source to display panel for cathode fluorescent tube (CCFL), thermal cathode fluorescent tube (HCFL) or external electrode fluorescent lamp pipe (EEFL); Two fluorescent tube reflex housings 11, top corner is the curved-surface structure with certain curvature, this district's face structure can be arc, be located at the outside of two fluorescent tubes 13 respectively, one end is fixed on the upper end of light guide plate 12 incidence surfaces 14, the other end is connected with an end of emission sheet 16, is used for the light that fluorescent tube 13 produces is reflexed to light guide plate 12; One reflector plate 16 is located at light guide plate 12 belows and is fixed on the backboard 15; Reflex housing 11, reflector plate 16 are used for the light that fluorescent tube 13 produces is reflexed to the utilization rate of light guide plate 12 with increase light, and then preferable brightness output is provided; Reflex housing 11 imports light efficiently in the light guide plate 12 and propagates, after the destruction via the leaded light site of light guide plate 12 arranged beneath and 16 pairs of total reflection phenomenons of reflector plate, light spreads ejaculation at an angle by the front of light guide plate 12, be uniformly distributed in the light-emitting zone, light guide plate 12 tops are disposed with diffusion sheet 17, some blooming pieces such as prismatic lens 18 and diffusion sheet 19,

diffusion sheet

17,19 can be with the further scattering of light by light guide plate 12 reflections, light is distributed to display panel more uniformly, prismatic lens 18 can further be revised the difference of light intensity, make light that one higher briliancy can be arranged, the quantity of prismatic lens 18 and order can be set according to demand; One plastic cement frame 20 includes sidewall, combines with backboard 15, is used for fixing each assembly of module backlight.

Distance between the fluorescent tube 13 of present embodiment side-light type back light module unit structure and the

blooming piece

16,17,18 existing back light module unit structure more shown in Figure 1 increases, therefore, the more diffusing toward back plate 15 of the heat of fluorescent tube 13, the relative existing structure of phenomenon of deterioration makes moderate progress and blooming

piece

17,18,19 is heated, and has reached the effect of efficiently radiates heat.

Fluorescent tube 13 is positioned at the side-lower of light guide plate 12 incidence surfaces 14, fluorescent tube reflex housing 11 is arranged to have the curved-surface structure of certain curvature, it is light utilization efficiency for maximum, need consider the thickness of light guide plate 12, the factors such as diameter of fluorescent tube 13 during the design of the curved-surface structure of fluorescent tube reflex housing 11, and reduce between the fluorescent tube 13 absorption light.Through optics emulation, the performance of its briliancy and existing structure light guide plate 12 thickness shown in Figure 1 were that the module backlight of 6mm is identical when light guide plate 12 thickness of the module backlight of present embodiment structure were 4mm.Light guide plate 12 thickness can be reduced to 4mm by 6mm, and therefore, the thickness of light guide plate 12 reduces comparatively obvious, thereby make the weight of entire aphototropism mould reduce to some extent, also can make the more lightweight of liquid crystal indicator of using this back light module unit structure whereby.

Claims

1, a kind of side-light type module backlight comprises

One light guide plate is used to the light that guides fluorescent tube to emit, is provided with incidence surface;

A plurality of fluorescent tubes are positioned at light guide plate incidence surface one side;

At least one reflex housing is located at the outside of fluorescent tube, is used for the light that fluorescent tube produces is reflexed to light guide plate;

Wherein said fluorescent tube is positioned at the side-lower of light guide plate incidence surface.

2, side-light type according to claim 1 module backlight is characterized in that described fluorescent tube quantity is four, is arranged into delegation.

3, side-light type according to claim 1 module backlight is characterized in that the top corner of described reflex housing is curved-surface structure.

4, side-light type according to claim 3 module backlight is characterized in that the curved structure of top corner of described reflex housing.

5, side-light type according to claim 1 and 2 module backlight is characterized in that described fluorescent tube is cold-cathode fluorescence lamp, hot-cathode fluorescent lamp or external electrode fluorescent lamp pipe.