CN201237102Y

CN201237102Y - Side light type back light module unit

Info

Publication number: CN201237102Y
Application number: CNU2008201507795U
Authority: CN
Inventors: 李郑阳
Original assignee: SVA Group Co Ltd
Current assignee: SVA Group Co Ltd
Priority date: 2008-07-14
Filing date: 2008-07-14
Publication date: 2009-05-13
Anticipated expiration: 2018-07-14

Abstract

The utility model discloses a sidelight type backlight module including a light guide plate, a lighting tube, and a reflection sheet arranged under the light guide plate. The light guide plate includes an incidence surface, and the lighting tube is placed on one side of the incidence surface, wherein, the outside surface of the lighting tube far away from the light guide plate is covered with a reflection layer in the area no larger than 50% of the surface area of the lighting tube, and the obliquity between the central axis and the horizontal axis of the reflection layer is minus or plus 30 degrees. The utility can reduce the loss of ray reflection through the reflection layer, and efficiently improve the ray utilization rate.

Description

Side-light type module backlight

Technical field

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

Background technology

Recent years, significant variation has taken place in Display Technique.Traditional CRT monitor is little by little replaced by flat-panel monitor, and wherein modal flat-panel monitor is exactly Thin Film Transistor-LCD (TFT-LCD), and it has advantages such as low in energy consumption, in light weight, that driving voltage is little.

LCD (LCD) is to utilize the variation that is added in electric-field intensity on the liquid crystal molecule, and the power that changes the orientation control printing opacity of liquid crystal molecule is come display image.Usually, LCD comprise backlight module, polaroid, TFT (thin film transistor (TFT)) infrabasal plate and CF (color filter) upper substrate and be clipped in two between substrate the liquid crystal cell upper substrate and be clipped in two liquid crystal layers between substrate.Crystal liquid substrate panel itself can not be luminous, need provide light source by module backlight.Module backlight is made up of LGP (LGP), light source, diffuser plate, various blooming piece usually.The difference of root light source position, present module backlight generally are divided into straight-down negative and side light inlet mode.In the side-light type back light module unit structure, adopting CCFL usually is light source.Fig. 1 is existing side-light type back light module unit structure schematic diagram, as shown in Figure 1, side-light type module backlight comprises a fluorescent tube 15, one LGP 14 and be positioned at the reflector plate 16 of LGP 14 belows, LGP 14 comprises an incidence surface 141, one bottom surface 142 and an exiting surface 143, this incidence surface 141 links to each other with bottom surface 142, this exiting surface 141 is relative with bottom surface 142, fluorescent tube 15 is positioned at this incidence surface 141 1 sides, the incidence surface 141 of this LGP 14 is used to receive the light beam that the fluorescent tube 15 from its side sends, this light beam is derived with the reflection back even emitted light beams of formation and by exiting surface 143 through the scattering of bottom surface 142, be converted to area source by LGP 14, and then after being arranged in diffusion sheet 13 above the LGP 14 and prismatic lens 12, shine display floater (figure does not illustrate), following diffusion sheet 13a can be with the further scattering of light by LGP 14 reflections, light is distributed to display floater more uniformly,

prismatic lens

12a, 12b can further revise the difference of luminous intensity, make light that one higher briliancy can be arranged, and the quantity of prismatic lens and order can be set according to demand, last diffusion sheet 13b can protect prismatic lens 12b, reduces scratch; For improving light utilization; usually also can increase fluorescent tube reflector 11 in the outside of fluorescent tube 15; one end of this fluorescent tube reflector 11 is fixed on the upper end of LGP 14 incidence surfaces 141; the other end is connected with an end of emission sheet 16, is used for the light that send in fluorescent tube 15 outsides is reflected into LGP 14 again.Though adopt fluorescent tube reflector 11 can improve the part utilization rate of light, but because liquid crystal module is to the restriction of size, in side-light type module backlight, fluorescent tube 15 rear sides generally only have less than 1mm distance apart from the distance h of fluorescent tube reflector 11, therefore have a large amount of light to come back reflective loss between fluorescent tube 15 and fluorescent tube reflector 11 because of reflection angle is less.

The utility model content

Technical problem to be solved in the utility model provides a kind of side-light type module backlight, can reduce the light reflection loss, improves light utilization.

The utility model is to solve the problems of the technologies described above the technical scheme that adopts to provide a kind of side-light type module backlight, the reflector plate that comprises LGP, fluorescent tube and be positioned at the LGP below, described LGP comprises an incidence surface, described fluorescent tube is positioned at incidence surface one side, wherein, be coated with the reflecting layer at fluorescent tube outer surface away from LGP, described reflecting layer area be not more than surface of the light tube long-pending 50%, the inclination angle of described reflecting layer central shaft and trunnion axis is between ± 30 degree.

In the above-mentioned side-light type module backlight, described reflecting layer area can be surface of the light tube long-pending 50%.

In the above-mentioned side-light type module backlight, described reflecting layer central shaft can be positioned on the trunnion axis.

In the above-mentioned side-light type module backlight, described reflecting layer is a metallic compound, and described metallic compound can adopt the mode of vacuum plating to be covered in described fluorescent tube outer surface.

The utility model contrast prior art has following beneficial effect: the utility model by the fluorescent tube outside away from the end face of LGP on the local reflecting layer that covers, neither influence the fluorescent tube bright dipping, simultaneously rear side light directly is reflected into, reduces the light reflection loss, can effectively improve light utilization.

Description of drawings

Fig. 1 is the structural representation of existing side-light type module backlight.

Fig. 2 is the structural representation of the utility model side-light type module backlight.

Fig. 3 is unreflected Illumination Distribution figure in the existing side-light type module backlight.

Fig. 4 is the Illumination Distribution figure that the reflecting layer is arranged in the utility model side-light type module backlight.

Fig. 5 is the reflecting layer position view on the fluorescent tube of the present utility model.

Among the figure

11

fluorescent tube reflector

12a, 12b prismatic lens 13a go up diffusion sheet under the diffusion sheet 13b

14 LGPs, 141 planes of incidence, 142 bottom surfaces, 143 exit facets

15 fluorescent tubes, 16 reflector plates

21

fluorescent tube reflector

22a, 22b prismatic lens 23a go up diffusion sheet under the diffusion sheet 23b

24 LGPs, 241 planes of incidence, 242 bottom surfaces, 243 exit facets

25 fluorescent tubes, 26 reflector plates, 27 reflecting layer

The specific embodiment

The utility model will be further described below in conjunction with drawings and Examples.

Fig. 2 is the structural representation of side-light type of the present utility model module backlight.

Please refer to Fig. 2, side-light type of the present utility model module backlight comprises a fluorescent tube 25, one LGP 24 and be positioned at the reflector plate 26 of LGP 24 belows, LGP 24 comprises an incidence surface 241, one bottom surface 242 and an exiting surface 243, this incidence surface 241 links to each other with bottom surface 242, this exiting surface 241 is relative with bottom surface 242, fluorescent tube 25 is positioned at this incidence surface 241 1 sides, the incidence surface 141 of this LGP 24 is used to receive the light beam that the fluorescent tube 25 from its side sends, this light beam is derived with the reflection back even emitted light beams of formation and by exiting surface 243 through the scattering of bottom surface 242, be converted to area source by LGP 24, and then by being positioned at the diffusion sheet 23a above the

LGP

24,23b and prismatic lens 22a, shine display floater (not illustrating among the figure) behind the 22b, following diffusion sheet 23a can be with the further scattering of light by LGP 24 reflections, light is distributed to display floater more uniformly,

prismatic lens

22a, 22b can further revise the difference of luminous intensity, make light that one higher briliancy can be arranged, and the quantity of prismatic lens and order can be set according to demand, last diffusion sheet 23b can protect prismatic lens 22b, reduces scratch; The arranged outside of fluorescent tube 25 has fluorescent tube reflector 21, and an end of this fluorescent tube reflector 21 is fixed on the upper end of LGP 24 incidence surfaces 241, and the other end is connected with an end of emission sheet 26.Be coated with reflecting layer 27 at fluorescent tube 25 outer surfaces away from LGP 24, described reflecting layer 27 areas are not more than 50% of fluorescent tube 25 surface areas, are preferably 50%; The inclination angle ∠ AOB of described reflecting layer 27 central shaft OB and trunnion axis OA is between ± 30 degree, and central shaft OB preferably is positioned on the trunnion axis OA.The material in reflecting layer 27 can adopt metal or metallic compound, and as silver, aluminium and compound thereof, reflecting layer 27 can adopt modes such as vacuum plating mode, vacuum vapor deposition method, chemical vapour deposition technique to be covered in the surface of fluorescent tube 25.

See also Fig. 3 and Fig. 4, be respectively the optical analog Illumination Distribution figure that increases the front and back, reflecting layer, the center illumination of existing module backlight is 13.21ux among Fig. 3, and light utilization efficiency is 72.9%.The center illumination of module knot backlight of the present utility model is 13.71ux among Fig. 4, and light utilization efficiency is 75.4%.As seen from the figure,, reduced the light reflection loss, effectively improved light utilization because reflecting layer 27 directly is reflected into LGP 14 with fluorescent tube 25 outside emitted light beams.

Fig. 5 is the utility model reflecting layer position view.

Please refer to Fig. 5, consider the general mode that adopts artificial assembling of fluorescent tube assembling, in operating process, might cause 27 positions, reflecting layer that a little skew is arranged, reflecting layer 27 central shafts not necessarily just in time are positioned on the trunnion axis, as shown in Figure 5, the inclination angle ∠ AOB of reflecting layer 27 central shaft OB and trunnion axis OA is respectively ± 30 degree.Side-light type of the present utility model module backlight is through software simulation, even reflecting layer 27 rotations 30 degree, the light utilization also can reach 74%, and therefore as long as assembling position guarantees inclination angle ∠ AOB between ± 30 degree, the light utilization still can effectively improve.

In sum, the utility model by the fluorescent tube outside away from the end face of LGP on the local reflecting layer that covers, neither influence the fluorescent tube bright dipping, simultaneously rear side light directly is reflected into, reduce the light reflection loss, can effectively improve light utilization.Particularly when the reflecting layer area be surface of the light tube long-pending 50%, when the reflecting layer was centered close on the trunnion axis, light utilization brought up to 75.4% by original 72.9%.

Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims

1. side-light type module backlight, the reflector plate that comprises LGP, fluorescent tube and be positioned at the LGP below, described LGP comprises an incidence surface, described fluorescent tube is positioned at incidence surface one side, it is characterized in that, be coated with the reflecting layer at fluorescent tube outer surface away from LGP, described reflecting layer area be not more than surface of the light tube long-pending 50%, the inclination angle of described reflecting layer central shaft and trunnion axis is between ± 30 degree.

2. side-light type according to claim 1 module backlight is characterized in that, described reflecting layer area be surface of the light tube long-pending 50%.

3. side-light type according to claim 1 module backlight is characterized in that described reflecting layer central shaft is positioned on the trunnion axis.

4. according to claim 1,2 or 3 described side-light types module backlight, it is characterized in that described reflecting layer is a metallic compound, described metallic compound adopts the mode of vacuum plating to be covered in described fluorescent tube outer surface.