CN202938235U

CN202938235U - Optical lens forming square light shape

Info

Publication number: CN202938235U
Application number: CN 201220551297
Authority: CN
Inventors: 唐德龙; 黄韦强; 魏志铭
Original assignee: YANGZHOU LEDLINK OPTICAL CO Ltd
Current assignee: YANGZHOU LEDLINK OPTICAL CO Ltd
Priority date: 2012-10-26
Filing date: 2012-10-26
Publication date: 2013-05-15
Anticipated expiration: 2022-10-26

Abstract

An optical lens forming square light shape is characterized by comprising a lens body, wherein a light-exiting surface is arranged at the top of the lens body, a light-entering surface is arranged at the bottom of the lens body, an accommodation space is formed in the center of the light-entering surface in a sinking manner so as to allow a luminous source to be accommodated, one edge line of the light-entering surface is a geometric figure of square and is formed by sealing and enclosing, the corners of the geometric figure of square are circular-arc, and light sent out by the luminous source can be projected to a target projecting plane to form a square light shape after passing through the lens body.

Description

Form the optical lens of square light shape

Technical field

The utility model is related to the technical field of optical lens, more particularly on a kind of optical lens for forming square light shape, to adjust lighting angle, photometric distribution and the Illumination Distribution of primary light source using secondary optics principle, it is allowed to present the illuminating effect of homogeneous light intensity.

Background technology

Because liquid crystal display is a kind of passive type display device for not having self light emission function, therefore backlight module need to be installed additional to provide the display light source needed for display panel, thus, whether the area source of backlight module generation has the display quality that enough and uniform brightness directly affects liquid crystal display.At present, backlight module can be divided into side-light type and straight-down negative according to its structure（Direct Type Backlight）Two kinds, wherein, direct type backlight module because with bloom according to the uniformity, good light extraction visual angle, high-light-energy utilization rate, easy package assembly, and can rapid fine adjustment picture area light and shade so that dynamic contrast is substantially improved the features such as and be widely used in large scale liquid crystal display.

Moreover, the application light source that LED has high luminous efficiency, long lifespan and the low characteristic of power consumption and turns into backlight module is preferred.Now know that a plurality of LED light sources and a plurality of optical lenses are installed on a substrate by direct type backlight module through the mode of matrix arrangement, and with a suitable distance by a diffuser plate（Diffusion Plate）It is covered on the grade emergent light surface of optical lens, is provided with being projected on display panel and provides the area source of brightness uniformity after the dispersed respectively light emitted optical path of the LED light source, i.e. mixed light.But, as shown in figure 1, direct type backlight module is in the shape of projection light schematic diagram on diffuser plate for known to, respectively the LED light source is after the optical lens, in forming a circular light shape 1 on the diffuser plate, by distribution this etc. circular light shape 1 constitute the illumination range of backlight module demand.However, the adjoiner between the circular light such as this shape 1 is formed with the highlights 10 that illumination region mutually occurs simultaneously and the dark portion 11 without illumination region, thus, interlaced highlights 10 and dark portion 11 will influence the light evenness of backlight module and reduce light mixing effect.Furthermore, the GTG level for influenceing neighbouring picture area is caused micro- fuzzy during bright dark areas in liquid crystal display changing pictures（Blooming）Phenomenon, reduces the definition and degree of saturation of picture image.

Therefore, change the circular light shape of former LED light source using optical lens, with formed can close proximity arrangement square light shape, to improve the uniform illumination degree and light mixing effect of application apparatus, the as purpose of the present invention.There is necessity person using rectangular light type simultaneously for other illumination association areas, can also combine the present invention and be applicable for it, and light area is substantially improved with practical range efficiency.

Utility model content

In view of problem of the prior art, the purpose of the utility model is to provide a kind of optical lens for forming square light shape, adaptation is set to be used for the demander for adapting to rectangle light type environment in the backlight of liquid crystal display or in lighting field, to improve the universe intensity of illumination of range of exposures.

According to the purpose of this utility model, the optical lens of the formation square light shape has a lens body, and the top of the lens body is provided with an exiting surface, bottom is provided with an incidence surface, the center of the incidence surface is recessed again forms an accommodation space, is provided with an accommodating light emitting source, it is characterised in that：The closing of one of incidence surface edge line surrounds and slightly in a square geometric figure, and the square geometric figure corner be in arc-shaped setting, the emitted light of the light emitting source is projected to a target projection surface and a square light shape is presented after the lens body.

Wherein, the target projection surface is arranged on one of backlight module diffuser plate, and the optical lens further includes an at least engaging body, and the engaging body is located at the bottom of the lens body, is provided with being mutually clamped fixation relative to a LED-baseplate.Also, the centre of the exiting surface is to form a concave point to lower recess, the illumination degree of convergence on the target projection surface is projected to the uniform light emitting source.

To ensure the square shape of light shape, the incidence surface projects the relative position to the exiting surface, and the dispersion angle at the exiting surface of the edge correspondence of the square geometric figure is more than or equal to dispersion angle at the exiting surface of the non-edge correspondence of the square geometric figure.Thus, when the optical lens is applied to the backlight module and is that plural number uses kenel, you can the square light shape for the arrangement that connects by grade optical lens formation, spent with the full frame light for lifting the backlight module, and then lift the light mixing effect of application liquid crystal device.In addition in lighting field, can also meet must be with the environmental requirement of rectangle light type realization.

Brief description of the drawings

Fig. 1 is known direct type backlight module in the shape of projection light schematic diagram on diffuser plate.

Fig. 2 is the schematic diagram of the utility model preferred embodiment.

Fig. 3 is the top view of the utility model preferred embodiment.

Fig. 4 is the sectional view of the utility model preferred embodiment.

Fig. 5 is the optical track figure of the utility model preferred embodiment.

Fig. 6 is one of the utility model preferred embodiment distribution curve flux figure.

Fig. 7 is another distribution curve flux figure of the utility model preferred embodiment.

Fig. 8 is the irradiation level figure of the utility model preferred embodiment.

Fig. 9 is to use schematic diagram when the utility model preferred embodiment is applied to backlight module.

Figure 10 be the utility model preferred embodiment be applied to backlight module when in the shape of projection light schematic diagram on diffuser plate.

Embodiment

Fig. 2~5 are referred to, it is respectively schematic diagram, top view, sectional view and the optical track figure of the utility model preferred embodiment.As illustrated, the optical lens 2 for forming square light shape has a lens body 20 and three engaging body 21, the top of the lens body 20 is provided with an exiting surface 200, its bottom be then provided with an incidence surface 201 and this etc. engaging body 21.The center of the incidence surface 201 is recessed to form an accommodation space, and the wide top in bottom is narrower like coniform space structure for the accommodation space, is provided with an accommodating light emitting source 3.The engaging body such as this 21 is provided with being mutually clamped fixation relative to a LED-baseplate 4, and can adopt the mode winding of the equidistant arrangement accommodation space to provide the support force of stabilization, makes the applicability of the lifting optical lens 2.Also, the closing of one of the incidence surface 201 edge line surrounds and is slightly in a square geometric figure, the corner of the square geometric figure is in the setting of arc-shaped, and it is slightly in cube structure to make the lens body 20.So, the emitted light of the light emitting source 3 is projected to a target projection surface through the lens body 20, it can obtain such as Fig. 6~8, it is respectively one of present pre-ferred embodiments distribution curve flux figure, another distribution curve flux figure and irradiation level figure, it is presented the lighting effect of a square light shape, and with one of 45~225 ° of lighting angle first axle I₁About be in depending on it, at relative two peripheries of the square light shape 75% relative intensity（Relatively Intensity）, and with one of 0~180 ° of lighting angle second axis I₂Depending on it, relative two edges of the square light shape are about in 100% relative intensity.

In other words, the target projection surface can be projected to the relative position at the exiting surface 200 for the incidence surface 201, and, dispersion angle at the exiting surface 200 of the edge correspondence of the square geometric figure is more than or equal to dispersion angle at the exiting surface 200 of the non-edge correspondence of the square geometric figure, to maintain light shape square really, make light deformation, such as circular light shape caused by avoiding having compared with high dispersion angle at the periphery of the square geometric figure.And, to lift the uniform illumination degree that the light emitting source 3 is projected on the target projection surface, the centre of the exiting surface 200 forms a concave point to lower recess, so as to further reflect the light that the light emitting source 3 is projected to the central part of exiting surface 200 with the concave point compared with sharp end angle, the photometric distribution of the light emitting source 3 is redistributed with adjustment member opticpath.

Also referring to Fig. 9,10, it is respectively use schematic diagram when the utility model preferred embodiment is applied to backlight module and its in the shape of projection light schematic diagram on diffuser plate.As illustrated, the optical lens 2 is suitable for bottom-lighting type back light module 5, and the backlight module 5 is provided with being used to provide lighting source in liquid crystal display and give a display module（It is not shown）.The backlight module 5 have a substrate 50, a plurality of LED light sources 51, a diffuser plate 52 and to should wait the setting of LED light source 51 this etc. optical lens 2, after the grade LED light source 51 is placed on the substrate 50 into matrix arrangement, and the grade optical lens 2 is fixedly arranged on the substrate 50 with engaging body 21 such as cylindrical these, and the grade LED light source 51 is set to be placed on respectively in the grade accommodation space.Also, the diffuser plate 52 is covered in the grade optical lens 2 with a suitable distance, to be sent to the display module after dissipating the light that the grade LED light source 51 is launched through the grade optical lens 2.Thus, carrying out the refraction and reflection of secondary optics through the grade optical lens 2, the light that the grade LED light source 51 is projected will be formed separately on the diffuser plate 52, i.e. the target projection surface as a square light shape 520.

Because the square light shape such as this 520 has the periphery of formed objects respectively, therefore can be set in forming mutually close together distribution on the diffuser plate 52.In other words, respectively the junction of square light shape 520 is by the generation without bright dark place difference, so that full frame uniform briliancy is presented in the backlight module 5, thereby improve the picture color saturation degree and clear sunrise degree of liquid crystal display, and then meet demand of the consumer in video signal amusement.

The preferred embodiment of illustrative is the foregoing is only, rather than is restricted person.Any spirit and scope without departing from the utility model, and the equivalent modifications carried out to it or change, are intended to be limited solely by rear attached claim.

Claims

1. one kind forms the optical lens of square light shape, it is characterised in that：It includes a lens body, and the top of the lens body is provided with an exiting surface, bottom is provided with an incidence surface, the center of the incidence surface is recessed again forms an accommodation space, be provided with an accommodating light emitting source, one of incidence surface edge line be closing surround and slightly in a square geometric figure, and the square geometric figure corner be in arc-shaped setting, the emitted light of the light emitting source is projected to a target projection surface and a square light shape is presented after the lens body.

2. the optical lens according to claim 1 for forming square light shape, it is characterised in that：The incidence surface projects the relative position to the exiting surface, and the dispersion angle at the exiting surface of the edge correspondence of the square geometric figure is more than or equal to dispersion angle at the exiting surface of the non-edge correspondence of the square geometric figure.

3. the optical lens according to claim 1 for forming square light shape, it is characterised in that：The centre of the exiting surface forms a concave point to lower recess.

4. the optical lens of the formation square light shape according to claim 1-3, it is characterised in that：The target projection surface is arranged on one of backlight module diffuser plate.

5. the optical lens according to claim 1 for forming square light shape, it is characterised in that：An at least engaging body is further included, the engaging body is located at the bottom of the lens body, is provided with being mutually clamped fixation relative to a LED-baseplate.