WO2009070981A1

WO2009070981A1 - Wide light evening backlight source module and backlight source using the same

Info

Publication number: WO2009070981A1
Application number: PCT/CN2008/001898
Authority: WO
Inventors: Junbo Liu
Original assignee: Junbo Liu
Priority date: 2007-11-23
Filing date: 2008-11-21
Publication date: 2009-06-11
Also published as: CN101418929A; CN101178514A; CN101418929B

Abstract

A wide light evening backlight source module comprises a linear light source (2), a light evening reflection plate (4) and a reflection cover (3), and the linear light source (2) is provided between the reflection plate (4) and the reflection cover (3). The reflection plate (4) comprises mirror reflection regions (51, 52), mixing reflection regions (6, 6') which are comprised of mirror reflection regions (62) and diffuse reflection regions (61, 63, 63', 64), and diffuse reflection regions (71, 72, 73). The mirror reflection regions (51, 52) are positioned at the central portion of the reflection plate (4), and the mirror reflection regions (51, 52) are substantially parallel to the linear light source (2) in the longitudinal direction. The mixing reflection regions (6, 6') are provided on the both sides of the mirror reflection regions (51, 52), and the diffuse reflection regions (71, 72, 73) are provided on the outside of at least one of the mixing reflection regions (6, 6'). A wide light evening backlight source comprises at least two wide light evening backlight source modules arranged side-by-side or arranged in staggered columns and rows.

Description

Wide-width homogenized backlight module and application with backlight of the module

Technical field

The invention relates to a backlight module, in particular to a single module or a plurality of modules installed in a light box or a wide light box for use as a backlight of an advertising light box, and can make the advertising light box energy-saving, high brightness and uniformity. Wide-width, uniform backlight module. Background technique

With the development of the economy, advertising light boxes have become a widely used form of media. Streets, alleys, shopping malls, supermarkets, various exhibitions, exhibitions, exhibitions, etc., are everywhere without advertising light boxes, advertising light boxes used. The number is huge, but most of the existing light boxes have very low light utilization rate, which results in a large amount of energy waste, and the uniformity of illumination of the picture is also poor, which directly affects the use effect of the advertising light box.

Today's light source technology and reflective materials have reached a very high level of performance, such as a 1200mm long 36wT8 tube (Philips three primary colors) with a luminous flux of 3250Lm, according to 90% utilization, can be displayed at 1200mm | X 500mm An average of 4,875 Lux is provided on the back of the face. That is to say, many existing light boxes (with a distance between 200mm and 250mm) should be able to reduce the number of lamps used by 50%~60%, or even more, while ensuring high brightness. Because the prior art can not solve the problem of wide-area high-efficiency reflection and uniform light, the problem of low light utilization rate and high energy waste of the light box has not been well solved.

Patent No. CN200420117731.6 "shading plate" provides a visor for improving the uniformity of light illumination of the advertising light box, but the structure of the visor is only used to block the direct light of the light source, and is not suitable for the wide format. Reflecting plates, especially wide-area reflectors for small-diameter light sources. Moreover, the visor requires a higher precision positioning, and a small range of deviation also easily causes a significant change in brightness on the display surface, that is, poor installation affects the uniformity of illumination.

Patent Application No. CN200720110837.7 "Reflection and homogenizing device for straight tube type light source" also proposes a reflection and homogenizing device for a straight tube type light source which can make the advertising light box thin, effective, and energy-saving. However, in practical applications, it is found that there are certain limitations in the structure. Because the uniform mask has an irregular shape, it will increase the manufacturing difficulty and the installation precision is relatively high, thereby increasing the difficulty of the work.

It is well known that the reflection of light on a smooth interface is specular reflection, or unidirectional reflection, otherwise it is diffuse reflection; if there is both specular reflection and diffuse reflection, it is called mirror diffuse reflection, or simply mixed reflection . How to improve the uniformity and light utilization by properly arranging the various reflection areas of the uniform light reflecting plate has not been disclosed in the literature.

- 1 - I confirm this Summary of the invention

The first technical problem to be solved by the present invention is to provide a wide-width homogenizing backlight module with high light utilization efficiency and good illumination uniformity for the above-mentioned state of the art.

A second technical problem to be solved by the present invention is to provide a backlight source to which the above wide-width homogenizing backlight module is applied.

The invention provides a technical solution for solving the above first technical problem: a wide-width homogenizing backlight module, comprising a line light source, a uniform light reflecting plate and a reflection cover, wherein the line light source is disposed on the uniform light reflecting plate And the reflector, wherein the uniform light reflecting plate has a specular reflection area, a mirror diffuse reflection area and a diffuse reflection area, wherein the specular reflection area is located at a central portion of the uniform light reflecting plate, and the specular reflection area The longitudinal direction is substantially parallel to the line source, and a mirror diffuse reflection region is respectively disposed on both sides of the specular reflection region, and a diffuse reflection region is disposed at least outside of one of the mirror diffuse reflection regions.

Further, the reflector may further have one or more transmission holes, and the transmission holes are preferably in the shape of a rhomboid or a rhomboid, and the edge of the reflector has a laterally convex tooth. In order to make the uniform light effect better, as an improvement, one side of the reflective cover facing the line light source may be a specular reflective surface, and the edge convex teeth of the reflective cover are sharp-toothed or arc-shaped, and adjacent convex teeth The degree of protrusion is not equal; and the other side of the reflective cover facing the display surface may be a diffuse reflection surface.

The line source may have an arc-shaped outer surface, and correspondingly, the reflector has a circular arc groove, or the reflector may be flat, and the line source There is a gap between them or abut against the line source.

The uniform light reflecting plate does not need to have a specific shape, but preferably, it may be composed of two sub-boards having a folded surface, and the two sub-boards are respectively arranged in wing-symmetric manner on both sides of the line light source. And, the two sub-boards intersect at a convex ridge line to form an angle α.

The mirror diffuse reflection reflection region may be composed of a specular reflection surface and at least one diffuse reflection surface disposed on a side of the specular reflection surface, and the diffuse reflection capability of the diffuse reflection surface is from the middle of the mirror diffusion reflection region. The side edges are gradually reinforced, and may be formed by providing a dot shape, a tooth shape or a strip shape.

In order to further enhance the uniform light reflection effect, the mirror diffuse reflection reflecting area may have at least one diffuse reflection surface at a central portion.

The diffuse reflection surface may be directly formed by a treatment process such as sanding or doting, or may be formed by attaching a diffuse reflection hook strip on the specular reflection surface.

The technical solution adopted by the second technical problem to be solved by the present invention is a wide-width homogenizing backlight composed of a wide-width homogenizing backlight module, characterized in that juxtaposed by at least two of said wide-width homogenizing backlight modules or Row intersection Arranged in a wrong manner, and at least behind the seam of the uniform light reflecting plate between two adjacent widened light-homogenizing backlight modules has a space for placing a ballast or a power source.

Compared with the prior art, the invention has the advantages that: the reflecting surface of the uniform light reflecting plate is composed of a specular reflection area, a mirror diffuse reflection reflection area and a diffuse reflection area, and the setting of three different reflection areas can effectively solve the reflected light. Distribution, control problems, even the wide reflector can ensure the uniformity of the display surface.

In addition, the design of the reflector also has obvious advantages. The mirror-reflecting surface facing the line source can effectively reflect the light to the reflecting surface far away from the offline source, and the diffusing surface toward the display surface can also make the display surface The light is softer, the upper transmission hole has a larger size, which is easier to manufacture, and the rhomboid-shaped transmission hole does not require high precision for the installation of the reflector, and the edge is a pointed-toothed design with varying degrees of protrusion. The reflected light can be cross-reflected at a distance to make the light softer, and the reflector with the arc groove can make the positioning faster and easier.

Due to the above measures, the effective efficiency of the backlight module is about 90%, and the width is 500~600mm, so the amount of the light source can be reduced, thereby achieving the purpose of energy saving. The backlight module can be used alone or multiple times. Parallel use of large-format backlights, can also be interlaced to form a large-format backlight, the thickness of the advertising light box can be controlled between 70mm (using T8 tube) ~ 50mm (using T5 tube), this module is installed in the advertising light box The uniformity of illumination on the display surface can reach 90% or more without using a soft light board. DRAWINGS

1 is a schematic perspective view of an embodiment of the present invention.

2 is a schematic cross-sectional view of an embodiment of the present invention.

Figure 3 is a schematic diagram of the optical path of Figure 2.

Fig. 4 is a schematic cross-sectional view showing an embodiment in which a wide-width light-reflecting reflector is used.

Figure 5 is a partial enlarged view of the mirror diffusing reflection region 6 of Figure 1.

Fig. 6 is an enlarged view of the periphery of the diffuse reflection reflecting portion 6' of Fig. 4.

Figure 7 is a schematic view of a flat strip-shaped reflector combined with a line source.

Figure ₈ is a schematic illustration of a reflector having a central arcuate slot mated with a tubular line source.

Fig. 9 is a partial structural schematic view of a reflector having a transmission hole of a rhomboid polygon.

Fig. 10 is a partial structural schematic view of a reflector having a rhomboid arc-shaped transmission hole.

Figure 11 is a schematic illustration of a side-by-side use of an embodiment of the present invention.

FIG. 12 is a schematic diagram of the interleaving of rows and columns according to an embodiment of the present invention.

Figure 13 is a use state reference diagram (installed in a light box) of an embodiment of the present invention. detailed description The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the backlight module in this embodiment uses a line light source 2, which may be an ordinary straight tube type fluorescent lamp (such as T8, Τ5), an external electrode fluorescent tube (EEFL), or a cold cathode fluorescent tube ( CCFL), LED tube (LED), etc.

The line light source 2 is disposed between the uniform light reflecting plate 4 and the reflecting cover 3, and the uniform light reflecting plate 4 is a reflecting plate having a multi-folded surface, and the light emitted from the line light source 2 is finally emitted from the display surface 1.

The uniform light reflecting plate 4 is composed of two sub-plates which are symmetrical to the center line of the line light source and each have a plurality of reflecting surfaces, and the two sub-boards are wing-shaped, forming α below the left and right symmetrical raised ridge lines. The angle, and the angle α is preferably an acute angle. The angle between the adjacent reflection surfaces of the hook light reflection plate 4 is generally an obtuse angle, and the uniform light reflection plate 4 is divided into mirror surfaces from the center line to the two sides. Reflective zone, mirror diffuse reflection zone, diffuse reflection zone.

The specular reflection area is composed of two specular reflection surfaces 51, 52 made of a mirror material.

The mirror diffuse reflection region 6 is made of a mirror material and a diffuse reflection material, and is composed of a specular reflection surface 62 and a diffuse reflection surface disposed on a side of the specular reflection surface, and the diffuse reflection surface has a convex tooth shape; The area consists of three diffuse reflecting surfaces 71, 72, 73 made of diffuse reflective material.

Referring to FIG. 2 and FIG. 5, the mirror diffuse reflection reflecting region 6 is formed by attaching a diffuse reflection light strip having a plurality of staggered torso shapes on both sides of the intermediate specular reflection surface 62, and the diffuse The tooth profile of the reflected light strip is directed toward the center of the mirror diffuse reflection region 6, and the diffuse reflection light strip constitutes the diffuse reflection surface 61, 63, and the diffuse reflection strip may have a dot or a plurality of strips (Fig. painting:).

Referring to FIG. 4 and FIG. 6, the width of the mirror diffusing reflection region 6' on the uniform light reflecting plate 4' is increased, and one or more diffuse reflection light strips 64 are added to the original mixed reflecting surface. The width of the diffuse reflection surface 63' is appropriately increased and wide, so that the illumination of the display surface of the wide-width uniform light-reflecting plate is more uniform, so that the backlight module of this structure is suitable for the wide-width uniform light-reflecting plate.

As shown in FIG. 3, part of the light emitted from the line light source 2 is reflected by the specular reflection surfaces 51, 52, 62 and reflected to the diffuse reflection surfaces 71, 72, 73 far away from the offline light source 2, and then diffused to the display surface. 1. The reflector 3 adjusts the amount of light directly from the line source to the display surface 1 through the transmission hole, and reflects part of the light through the specular reflection surface on the reflector 3 to the reflection surface of the hook light reflector 4 which is far away from the offline light source 2, and then reflects To the display surface 1, and the multi-layered convex teeth at the edge of the reflector 3 can effectively adjust the influence of the reflected light near the line source 2 on the display surface 1, and the diffuse reflection surfaces 61, 63 of the mirror diffuse reflection region pass through its density change. Further adjust the illumination uniformity of the display surface 1.

The reflecting cover 3 faces the line light source. The surface of the reflecting surface 3 is a specular reflecting surface, and the display surface 1 is a diffuse reflecting surface.

As shown in FIG. 7 , in a matching structure of the reflector 3 and the line source 2 , the reflector 3 is a flat strip, located above the line source 2, with a small gap between the line source 2 or directly on the line source 2 .

As shown in FIG. 8, as another matching structure of the reflector 3' and the tubular line source 2, an arcuate groove is formed in the middle of the reflector 3', and the arc of the arc groove is curved with the surface of the line source 2. Consistent, the width of the arc groove is smaller than the line light The diameter of the source 2, the circular arc groove makes the reflector 3' simple, quick and easy to position.

As shown in FIG. 9, a specific shape of the surface of the reflector 3 is shown. The shape of the transmission hole 31 on the reflector 3 is a rhomboid polygon, and the edge 32 has a convex tooth shape and a convexity of the adjacent convex tooth. Not equal

As shown in FIG. 10, another specific shape of the surface of the reflector 3 is shown. The shape of the transmission hole 31' on the reflector 3 is a rhomboid arc shape, and the edge 32' of the convex tooth is arc-shaped, adjacent to the convex shape. The degree of protrusion of the teeth is not equal.

In the above two structures, the tines, the arc teeth and the transmission holes on the edge of the reflector 3 are distributed symmetrically with respect to the center line of the reflector 3.

As shown in Fig. 11, two or more of the embodiments are arranged side by side in parallel with a plurality of uniform light reflecting plates 4 and line light sources 2 which can be used as large format backlights.

As shown in FIG. 12, two or more embodiments of the present embodiment are arranged and interleaved to form a super-large-format backlight, wherein two rows of light source heads 21 connected to the line source 2 can be inserted into another row of two modules. Under the joint of the uniform light-reflecting plate 4, the indirect stitch shadow is eliminated, and the uniform light requirement is further achieved.

As shown in FIG. 13, the reference state of the present embodiment in the light box 9, the space behind the seam of the uniform light reflecting plate 4, 4' between the two wide-width light-homing backlight modules can be placed in the ballast or The power supply 8 makes full use of the space inside the light box 9. The thickness of the frame of the light box 9 can be controlled between 70 mm (using a T8 tube) and 50 mm (using a T5 tube), and the illumination of the display surface 1 is not soft. In the case of light panels, it can reach more than 90%.

Claims

Rights request

A wide-width homogenizing backlight module, comprising a line light source (2), an hook light reflecting plate (4) and a reflection cover (3), wherein the line light source (2) is disposed on the uniform light reflecting plate (4) Between the reflector and the reflector (3), the uniform light reflecting plate (4) has a specular reflection region (51, 52), a mirror diffuse reflection region (6; 6') and a diffuse reflection region (71, 72, 73), wherein the specular reflection area (51, 52) is located at a central portion of the uniform light reflecting plate (4), and the longitudinal direction of the specular reflection area (51, 52) is substantially parallel to the line light source (2), at the mirror surface A mirror diffusing reflection region (6; 6') is disposed on both sides of the reflection region (51, 52), and a diffuse reflection region (71, 72) is disposed at least outside one of the mirror diffuse reflection regions (6; 6'). , 73).

2. The wide-width homogenizing backlight module according to claim 1, wherein said reflecting cover (3) is provided with a transmission hole (31, 31'), and an edge of said reflection cover (3) ( 32, 32') has convex teeth with laterally outward convexities, and the convexities of adjacent convex teeth are not equal.

3. A wide-width, uniform light backlight module according to claim 2, characterized in that one side of the reflector (3) facing the line source (2) is a specular surface.

The wide-light hook backlight module according to claim 2, wherein the line source (2) has an arc-shaped outer surface, and correspondingly, the reflector (3') has an arc The grooves match.

The wide-width light-homing backlight module according to claim 2, wherein the reflector (3) has a flat strip shape and has a gap or a line with the line light source (2) On the light source (2).

6. The wide-beam hook backlight module according to claim 1, wherein the uniform light reflecting plate (4) is composed of two sub-boards having a folded surface, and the two sub-boards are wing-symmetrical. The grounds are respectively arranged on both sides of the line light source (2), and the two sub-boards intersect at a convex ridge line to form an angle α.

7. A wide-width, uniform light backlight module according to any one of claims 1 to 6, wherein said mirror diffuse reflection region (6; 6') is comprised of a specular reflection surface (62) and at least a diffuse reflecting surface (61, 63; 61, 63') disposed on the side of the specular reflecting surface (62), and the diffuse reflecting ability of the diffusing reflecting surface (61, 63; 61, 63') is self-reflecting The intermediate side of the mixed reflection zone (6; 6') gradually increases.

8. The wide-width homogenizing backlight module according to claim 7, wherein the diffuse reflecting surface (61, 63) has a convex tooth shape.

9. A wide-width, uniform light backlight module according to claim 7, wherein said mirror diffuse reflection region (6, 6') further has at least one diffuse reflection surface at a central portion.

10. A wide-height backlight backlight comprising a wide-width, uniform light backlight module according to any one of claims 1-9, wherein at least two of said wide-width light-homed backlight modules are juxtaposed or The rows and columns are staggered and have a space for placing a ballast or power source (8) at least behind the seam of the uniform light reflecting plate (4) between two adjacent widened light homogenizing backlight modules.