CN201083929Y - Backlight module group reflecting plate - Google Patents

Abstract

The utility model relates to a reflector plate of backlight module group, which is positioned under a plurality of stripy arrayed linear light. The utility model is characterized in that: a plurality of reflective structures arrayed correspondingly to the linear light are arranged on the reflector plate, the reflective structures are symmetric with the linear light as a symmetrical line, and the shape of the reflective structure profile forms a Fresnel reflective concave mirror with a focal axis, enabling the linear light to be at the focal axial of the reflective structure, after the linear light irradiates the reflector plate, the linear light can be reflected in parallel with the normal direction of the reflective structure, so as to increase the light source utilization ratio.

Description

The reflecting plate of module backlight

Technical field

The utility model relates to a kind of reflecting plate, relates in particular to a kind of reflecting plate that is applied in the module backlight.

Background technology

LCD is owing to have compact, high resolving power, advantage such as cheap, become the main flow of flat-panel screens, LCD mainly is made up of assemblies such as liquid crystal panel (cell), module backlight, drive IC, LCD provides visual light source by module backlight, and penetrates liquid crystal panel and form various images with the control by drive IC.

The light source of module backlight can be divided into three kinds of pointolite, line source and area sources, wherein common pointolite such as Organic Light Emitting Diode (LED), line source such as cold-cathode tube (CCFL), common area source then is to utilize emission (Field Emission) electrode to excite discharge gas to produce ultraviolet ray, and is planar fluorescent powder to produce area source by the ultraviolet ray bump.

Line source has the yield height at present, the advantage that cost of manufacture is cheap relatively, thereby adopted by module backlight widely, see also shown in Figure 1, known module backlight comprises a light tube group 1, one diffuser plate 2, once diffusion sheet 3, one rhombus lens 4, a pair of lamina brightening piece 5 and a reflecting plate 6, the line source that it allows this light tube group 1 be provided, through concentrated this diffuser plate 2 and this time diffusion sheet 3 of injecting of the reflection of this reflecting plate 6, and through superrefraction and scattering and form uniform light source, reflect through the guiding of this rhombus lens 4 polarisation again with this bilayer brightening piece 5, and as the display light source of display.

This known reflecting plate 6, in order to increase reflection efficiency, mostly be the aluminium sheet punching press greatly and make, stick reflector plate again, to increase reflection efficiency, but because consider cost factor, known reflecting plate 6 mostly is planar design, and the concentration efficiency of its light source is not good, it is then it is with high costs that if it make curved surface, be difficult to universalness, and not good because of the light source utilization ratio of module backlight again, and the reluctant puzzlement of used heat is easily arranged.

Summary of the invention

Therefore, fundamental purpose of the present utility model is to provide a kind of reflecting plate, and it can be converted to line source reflection directional light and penetrate, and improving the light source utilization ratio of module backlight, and omits the use of diffuser plate, reduces used heat and produces.

By as can be known above, for reaching above-mentioned purpose, the utility model provides a kind of reflecting plate of module backlight, it is assemblied under a plurality of line sources of stripe-arrangement, and this reflecting plate is provided with many reflective structures of these many line sources arrangements relatively, these a plurality of reflective structures are that line of symmetry is symmetry shape with this line source that correspondence is arranged respectively, and the cross-sectional profile of these a plurality of reflective structures has a plurality of camber line faces and forms Fresnel (Fresnel) reflective concave surface mirror and have a focal axis respectively, and these a plurality of line sources are laid respectively on the focal axis of these a plurality of reflective structures.

In view of the above, the utility model can allow a plurality of line sources by these a plurality of reflective structures, and reflection is converted to directional light and penetrates, and compares prior art, and it has following advantage at least: improve the light source utilization ratio 1.; 2. reducing used heat produces; 3. bright enough briliancy is provided.

Description of drawings

Fig. 1 is the structural drawing of known module backlight.

Fig. 2 is the structural perspective according to reflecting plate of the present utility model.

Fig. 3 is the reflection synoptic diagram according to line source incident reflective structure of the present utility model.

Fig. 4 is the structural perspective according to the reflecting plate of another embodiment of the present utility model.

Fig. 5 calculates figure according to the size of the reflecting plate of another embodiment of the present utility model.

Fig. 6 is the reflection synoptic diagram according to the line source incident reflective structure of another embodiment of the present utility model.

Fig. 7 is the structural drawing according to another embodiment of the present utility model.

Embodiment

For feature of the present utility model, purpose and effect are had more deep understanding and approval, enumerate preferred embodiment and cooperate illustrate as follows:

See also Fig. 2 and shown in Figure 3, the utility model is a kind of reflecting plate 20, it is assemblied under a plurality of line sources 30 of stripe-arrangement, these a plurality of line sources 30 can be cold-cathode tube, and this reflecting plate 20 is provided with a plurality of reflective structures 21 of these a plurality of line sources 30 arrangements relatively, these a plurality of reflective structures 21 are that line of symmetry is symmetry shape with this line source 30 that correspondence is arranged respectively, and the cross-sectional profile of these a plurality of reflective structures 21 has a plurality of camber line faces 211 forming Fresnel (Fresnel) reflective concave surface mirror and to have a focal axis 22 respectively, and these a plurality of line sources 30 are laid respectively on the focal axis 22 of these a plurality of reflective structures 21.

Thus, the emitted light 40 of this a plurality of line source 30 can produce reflection and penetrates in the normal direction of this reflective structure 21 behind this reflecting plate 20 of incident, thereby can improve its light source utilization ratio.

In addition, if becoming, cross-sectional profile that will these a plurality of reflective structures 21 meets the shape that produces Fresnel (Fresnel) reflective concave surface mirror fully, its with high costs and processing difficulties, see also Fig. 4 and shown in Figure 5, in order to reduce manufacturing cost, these a plurality of camber line faces 211 can change the oblique line face (Sm) 212 of shape approximation into, and make the cross-sectional profile of these a plurality of reflective structures 21 be similar to the shape of Fresnel reflection concave mirror.And the angle θ of different oblique line faces 212 _m, can try to achieve according to following equation.

$f_m=\frac{{\mathrm{<figure-callout\; id="2"\; label="R\; m"\; filenames="Y20072012766900081.png"\; state="\{\{state\}\}">R</figure-callout>}}_m}{2}$

$f_m=\sqrt{{\left(h\right)}^2+{\left[(m-\frac{1}{2})b\right]}^2}$

${\mathrm{\&theta;}}_m={\cos }^{-1}\left[\frac{(m-\frac{1}{2})b}{R_m}\right]$

Wherein m represents different oblique line face 212 (counted toward about by the center, different oblique line faces 212 is m=1,2,3,4... in regular turn), f _mFor focal axis 22 is length, the R of focal axis 22 to oblique line face 212 summits to length, the h of oblique line face 212 _mFor the vertical extension line of oblique line face 212 is the Fresnel spacing of being scheduled to length, the b of focal axis 22 and reflecting plate 20 vertical connecting lines, under machining precision problem tolerable, b is healed little Fresnel (Fresnel) the reflective concave surface mirror effect that then produces better, and the length that allows oblique line face 212 project to reflecting plate 20 just in time is b.

So, it is more or less freely on making, and can reduce manufacturing cost, and please see also shown in Figure 6 again, it allows after this reflecting plate 20 of light 40 incidents that a plurality of line sources 30 penetrate, and the reflection of Fresnel (Fresnel) the reflective concave surface mirror that can form at oblique line face 212 is down and roughly towards the reflective structure 21 normal directions ejaculation of this reflecting plate 20 equally.

See also shown in Figure 7 again, but the reflective structure 21 of reflecting plate 20 of the present utility model is Bao Keyi first light-reflecting portion 213 also, one second light-reflecting portion 214 and one the 3rd light-reflecting portion 215, this first light-reflecting portion 213, this second light-reflecting portion 214 all forms the profile that meets Fresnel (Fresnel) reflective concave surface mirror with the 3rd light-reflecting portion 215, it has identical focal axis 22 and different normal directions, the angle difference of its normal direction is θ, wherein the preferable arrangement angles of θ is 30 degree, when it is applied in the module backlight in view of the above, except that the brightness of forward, the brightness of each 30 degree direction about also can providing, thereby it is when being applied to display, brightness in the time of can increasing different certain viewing angles and watch different content, to improve the display performance of display, make it can be applicable to automobile screen, TVs etc. need with the angle difference, and displaying contents is followed different displays.

As mentioned above, the utility model is by allowing reflective structure 21 form to meet the profile of Fresnel (Fresnel) reflective concave surface mirror, allowing line source 30 be converted to directional light through reflection penetrates in reflective structure 21 normal directions, so can improve the light source utilization ratio, and reduce the used heat generation, to improve the performance of using module backlight of the present utility model.

Claims (5)

1. the reflecting plate of a module backlight, it is assemblied under a plurality of line sources (30) of stripe-arrangement, and described reflecting plate (20) is provided with a plurality of reflective structures (21) that described relatively a plurality of line sources (30) are arranged, it is characterized in that, described a plurality of reflective structure (21) is that line of symmetry is symmetry shape with the described line source (30) that correspondence is arranged respectively, and the cross-sectional profile of described a plurality of reflective structure (21) has a plurality of camber line faces (211) forming the Fresnel reflection concave mirror and to have a focal axis (22) respectively, and described a plurality of line source (30) is laid respectively on the focal axis (22) of described a plurality of reflective structure (21).

2. the reflecting plate of module backlight according to claim 1 is characterized in that, described a plurality of camber line faces (211) are oblique line face (212).

3. the reflecting plate of module backlight according to claim 1 is characterized in that, described a plurality of line sources (30) are cold-cathode tube.

4. the reflecting plate of module backlight according to claim 1, it is characterized in that, described reflective structure (21) comprises one first light-reflecting portion (213), one second light-reflecting portion (214) and one the 3rd light-reflecting portion (215), described first light-reflecting portion (213), described second light-reflecting portion (214) all form the profile that meets the Fresnel reflection concave mirror with described the 3rd light-reflecting portion (215), and described first light-reflecting portion (213), described second light-reflecting portion (214) have identical focal axis (22) and different normal directions with described the 3rd light-reflecting portion (215).

5. the reflecting plate of module backlight according to claim 4 is characterized in that, described first light-reflecting portion (213), described second light-reflecting portion (214) are 30 degree with described the 3rd light-reflecting portion (215) normal direction angle difference to each other.

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