CN102297345A - Lighting device with microstructured brightness enhancing film - Google Patents

Abstract

The invention relates to a lighting device with a microstructure brightness enhancement film, which comprises a shell, a plane light source, a microstructure brightness enhancement film and a reflector, wherein the microstructure brightness enhancement film is fixedly arranged on the shell and is positioned above the plane light source, the microstructure brightness enhancement film is a thin sheet body capable of transmitting light and is provided with a top surface, a bottom surface and a Fresnel light-gathering part, the bottom surface is a plane, the Fresnel light-gathering part is convexly arranged on the top surface, and the section shape of the Fresnel light-gathering part in the vertical direction is in a sawtooth shape and is periodically changed for more than two times from the center to the outer periphery; therefore, the light can be effectively focused, the luminous efficiency is improved, the central luminous intensity is increased, the number of OLED using particles of the plane light source is reduced, the manufacturing cost is further reduced, and the practicability is excellent.

Description

Lighting device with microstructured brightness enhancing film

technical field

The invention relates to an appliance capable of illuminating, in particular to an illuminating device with a microstructure brightness-enhancing film.

Background technique

At present, generally existing planar light sources project a field shape of the light source as Lambertian, that is, a Lambertian light source. The divergence angle of the light emitted by the planar light source is large, which is likely to cause the disadvantages of poor luminous efficiency and low central luminous intensity. When it is applied to lighting devices, such as taillights, it is necessary to use multiple OLED [Organic Light-Emitting Diode organic light-emitting diodes] Diodes] to meet the regulatory requirements for lighting brightness, which will greatly increase the manufacturing cost.

Therefore, the prior art illuminating device using a planar light source has the disadvantages of poor luminous efficiency, low central luminous intensity, and increased manufacturing cost, and there is a need for improvement.

Contents of the invention

In order to solve the shortcomings and limitations of the prior art lighting device using a planar light source related to poor luminous efficiency, low central luminous intensity and increased manufacturing cost, the purpose of the present invention is to provide a lighting device with a microstructure brightness enhancing film , which is equipped with a microstructure brightness enhancement film, the zigzag Fresnel light concentrating part of the microstructure brightness enhancement film has more than two periodic changes, and with the setting of the reflector, it can effectively focus the light and improve the luminous Efficiency, increase the central luminous intensity and reduce the number of OLEDs used as a planar light source, thereby reducing manufacturing costs, and has excellent practicability.

The technical solution used in the present invention is to provide a lighting device with a microstructure brightness enhancement film, including:

a shell;

a plane light source, which is fixed in the casing and has a top surface;

A microstructure brightness enhancement film, which is fixed on the housing and located above the top surface of the planar light source; the microstructure brightness enhancement film is a light-transmitting thin sheet with a top, a bottom and a Fresnel light concentrating part, the bottom surface of the microstructure brightness enhancement film is a plane, the Fresnel light concentration part is located on the top of the microstructure brightness enhancement film, and the Fresnel light concentration part is provided with a center and an outer periphery , the cross-sectional shape of the Fresnel concentrating part in the vertical direction is zigzag and changes periodically from the center to the outer periphery twice or more, wherein a first period is formed in the part of the first period A light-gathering area, the first light-gathering area includes a plurality of surrounding sawtooths, the plurality of sawtooths are adjacent to each other and distributed around the center; a second light-gathering area is formed in the second period part, the The second light-gathering area surrounds and is adjacent to the first light-gathering area; the sawtooth arrangement sequence and cross-sectional shape of the second light-gathering area are the same as those of the first light-gathering area; and

A reflector is fixed in the casing and surrounds the planar light source.

In the lighting device with a microstructure brightness enhancement film, the planar light source is provided with a center position, the center of the aforementioned Fresnel light concentrating part is aligned with the center position of the planar light source, and the maximum length of the Fresnel light concentrating part is greater than Equal to the maximum length of the plane light source.

In the lighting device with a microstructure brightness enhancing film, the Fresnel light-concentrating part changes periodically from the aforementioned center to the aforementioned outer periphery for three times, and forms a third period part of the third cycle. Spotlight.

In the lighting device with a microstructure brightness enhancing film, the cross-sectional shape of the Fresnel light-gathering part in the horizontal direction is circular, the aforementioned first light-gathering area is circular, the aforementioned second light-gathering area and the aforementioned The third light-gathering areas are respectively ring-shaped.

In the illuminating device with a microstructure brightness enhancing film, the planar light source is a plurality of organic light emitting diodes arranged side by side.

In the lighting device with a microstructure brightness enhancement film, the microstructure brightness enhancement film is set to allow light with a divergence angle less than or equal to 30 degrees to pass through.

In the lighting device with the microstructure brightness enhancing film, the distance between the Fresnel light concentrating part and the aforementioned planar light source is in the range of 1 mm or more and 15 mm or less.

In the illuminating device with a microstructure brightness enhancement film, the reflectors are four reflectors, and each reflector is provided with a reflective surface, and each reflective surface is adjacent to the aforementioned planar light source and has a concave arc shape.

In the lighting device with a microstructure brightness enhancement film, the cross-sectional shape of the Fresnel light-gathering part in the horizontal direction is square, and the aforementioned first light-gathering area is square.

In the illuminating device with the microstructure brightness enhancement film, the cross-sectional shape of the Fresnel light concentrating part in the horizontal direction is an oval shape, and the aforementioned first light concentrating area is an oval shape.

The lighting device with microstructure brightness enhancement film provided by the present invention can obtain beneficial effects as follows: due to the zigzag Fresnel light concentrating part of the microstructure brightness enhancement film has more than two periodic changes, and cooperates with reflection The setting of the body can effectively focus the light, improve the luminous efficiency, increase the central luminous intensity and reduce the number of OLEDs used for the planar light source, thereby reducing the manufacturing cost and having excellent practicability.

Description of drawings

FIG. 1 is a schematic partial three-dimensional cross-sectional view of a first preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the first preferred embodiment of the present invention where the light rays enter the Fresnel concentrator.

Fig. 3 is a schematic diagram of the first preferred embodiment of the present invention where the light rays are incident on the reflector.

Fig. 4 is a schematic partial three-dimensional cross-sectional view of the first preferred embodiment of the present invention.

Fig. 5 is a schematic partial three-dimensional cross-sectional view of a Fresnel concentrator according to a second preferred embodiment of the present invention.

Fig. 6 is a partial three-dimensional cross-sectional schematic view of the Fresnel light concentrating part of the third preferred embodiment of the present invention.

Detailed ways

The technical solutions adopted by the present invention to achieve the intended invention purpose are further described below in conjunction with the accompanying drawings and preferred embodiments of the present invention.

A first preferred embodiment of a lighting device with a microstructure brightness enhancement film provided by the present invention, as shown in FIG. Components such as a reflector 70, wherein:

As shown in FIG. 1 , the casing 10 is hollow, and the casing 10 is a component of the prior art, and is not the focus of the present invention, and its detailed structure will not be repeated.

As shown in FIGS. 1 and 2 , the planar light source 30 is fixed horizontally in the casing 10 and has a top surface. Preferably, the planar light source 30 is formed by a plurality of organic light emitting diodes arranged side by side.

As shown in Figures 1 and 2, the microstructure brightness enhancement film 50 is fixed on the top of the housing 10 and above the top surface of the planar light source 30; the microstructure brightness enhancement film 50 is a light-transmitting thin film. Shaped rectangular sheet and is provided with a top, a bottom surface and a Fresnel light concentrating part 51; The bottom surface of this microstructure brightness enhancement film 50 is a plane; The cross-sectional shape of the Fresnel light-collecting part 51 in the horizontal direction is circular, and the cross-sectional shape of the Fresnel light-collecting part 51 in the vertical direction is zigzag and starts from the center of the circle toward the circumference to form more than two times. Periodic changes, wherein, a circular first light-focusing area 511 is formed in the part of the first period, and the first light-gathering area 511 includes a plurality of adjacent sawtooth 5111, and the plurality of sawtooth 5111 is annular and Distributed in concentric circles with the center of the Fresnel light concentrating portion 51; the first light concentrating region 511 is a Fresnel lens (Fresnel Lens) of the prior art, and its detailed structure will not be repeated;

In the part of the second cycle, an annular second focus area 513 is formed, the second focus area 513 surrounds and is adjacent to the first focus area 511; the sawtooth 5131 arrangement of the second focus area 513 The sequence and cross-sectional shape are all the same as those of the first light-focusing area 511, so no further description is required here, and since the Fresnel light-condensing portion 51 changes periodically, the radial length of the second light-focusing area 513 is the same as that of the first light-focusing area 513. The radial lengths of the focusing areas 511 are the same; since the planar light source 30 can be regarded as having many point light sources gathered together, it is possible to focus on point light sources at different positions through multiple (more than two) focusing areas. In other words, the periodic change of the Fresnel light concentrating part 51 can be applied to the planar light source 30 to achieve the purpose of light concentrating.

Preferably, the Fresnel condensing part 51 changes periodically from the center of the circle to the circumference three times, and forms an annular third condensing area 515 in the part of the third cycle, the third condensing The arrangement sequence and cross-sectional shape of the sawtooth 5151 in the region 515 are the same as those of the first light-gathering region 511;

Preferably, the center of the Fresnel concentrator 51 is aligned with the center of the planar light source 30;

Preferably, the diameter of the Fresnel light concentrating portion 51 is greater than or equal to the maximum length of the planar light source 30, and the distance between the Fresnel light concentrating portion 51 and the planar light source 30 ranges from more than 1 mm to less than 15 mm; thereby, Most of the light from the planar light source 30 can be directed to the Fresnel light concentrating part 51 to achieve a better converging effect.

As shown in Figures 1 and 3, the reflector 70 is fixed in the housing 10 and surrounds the planar light source 30; preferably, the reflector 70 is four reflectors, and each reflector is provided with a reflective surface 71 Each reflective surface 71 is adjacent to the planar light source 30 and forms a concave arc-shaped parabola.

As shown in Figures 2 and 3, in the first preferred embodiment, the illuminating device with the microstructure brightness enhancing film of the present invention is a car tail light, and the plane light source 30 emits light, wherein, because the plane light source 30 is away from the microstructure The brightness enhancement film 50 is very close, so most of the light from the planar light source 30 will hit the microstructure brightness enhancement film 50; and according to the optical properties of refraction and total reflection, the microstructure brightness enhancement film 30 will make the divergence angle less than or equal to one The light in the preset angle [in the first preferred embodiment of the present invention is set to 30 degrees] passes through, and the light rays with a divergence angle greater than 30 degrees will return to the plane light source 30, [the divergence angle defined in the present invention is as follows θr in Fig. 2, that is, the angle between the normal of any point on the Fresnel light concentrating part 51 and the refracted light rays refracted out of the microstructure brightness enhancement film 50, that is, the commonly referred to as the refraction angle]; the divergence angle is greater than 30 degrees After the light has been reflected many times, it will not be emitted until the incident angle of the light is less than or equal to the preset angle;

The light from other parts of the planar light source 30 will hit the reflector 70, and use the concave arc-shaped reflective surface 71 to achieve a converging effect, and then emit upward;

Through the microstructure brightness enhancement film 50 and the reflector 70 of the present invention, the light emitted by the planar light source 30 can form a narrow light pattern (as shown in FIG. 4 ), which meets the light pattern requirements of the taillight regulations.

It is supplemented here that, in conjunction with the size of the light-emitting area of the planar light source 30, the present invention can properly adjust the interval of the period of the Fresnel light-concentrating part 51, that is, the length of the radial length of the light-concentrating regions 511, 513, and 515, so as to Reach the best light-gathering effect; For example, as shown in Figure 2, the radial length of the light-gathering area is D, the distance between the plane light source 30 and the microstructure brightness enhancement film 50 is Z, and the plane light source 30 passes through the distance of D/2 The included angle between the normal line and the edge of the focus area [only marked in the second focus area 513] is θ, so D=2Z*tanθ, wherein, in the first preferred embodiment of the present invention, θ is between between 25 degrees and 60 degrees, and Z is between 1mm and 15mm, and the smaller the Z, the smaller theta and D need to be designed; as long as the Fresnel focusing area 51 of the present invention has periodic changes, The effect of concentrating light on the planar light source 30 can be achieved, and the present invention does not make specific limitations on the values of Z, θ, and D.

In the first preferred embodiment of the present invention, 13 red light OLEDs [OrganicLight-Emitting Diode] are used. Please refer to Fig. 4 further. Fig. 4 is a schematic diagram of the light source field of the present invention, and the horizontal axis is the viewing angle [Viewing angle ], the unit is degree [Degree], the vertical axis is the luminous intensity [LuminousIntensity], the unit is [cd]; the dotted line is the luminous intensity distribution without using the microstructure brightness enhancement film 50, and the solid line is after using the microstructure brightness enhancement film 50 luminous intensity distribution; the central luminous intensity without using the microstructured luminance enhancement film 50 is about 30.5cd, while the central luminous intensity with the microstructured luminance enhancement film 50 is about 67.6cd, so as to achieve the light concentrating effect and meet the brightness of the rear lights need.

The lighting device with the microstructure brightness enhancing film of the present invention is implemented in the rear lights of cars, and the present invention can also be implemented in desk lamps, car side lights, etc. to achieve the effect of concentrating light, and the present invention is not specific for the field and application of implementation limit.

As shown in FIG. 5 , the second preferred embodiment of the lighting device with a microstructure brightness enhancing film of the present invention is substantially the same as the first preferred embodiment described above, wherein the Fresnel light concentrating part 51A is horizontally The cross-sectional shape in the direction is a square, and the first light-gathering area 511A is a square.

As shown in FIG. 6 , the third preferred embodiment of the lighting device with microstructure brightness enhancing film of the present invention is substantially the same as the first preferred embodiment above, wherein the Fresnel light concentrating part 51B is horizontal The cross-sectional shape of the direction is an ellipse, and the first light-gathering area 511B is an ellipse.

From the second preferred embodiment and the third preferred embodiment, it can be known that the Fresnel concentrators 51, 51A, 51B of the present invention can be square, rectangular, elliptical or other shapes and not limited to circular, The present invention makes no specific limitation on the shape of the Fresnel light concentrating parts 51 , 51A, 51B.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the preferred embodiments of the present invention are disclosed above, they are not intended to limit the present invention. Any skilled person familiar with the art , without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or modifications to equivalent embodiments with equivalent changes, but as long as the content of the technical solution of the present invention is not departed from, according to the technical content of the present invention Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (10)

1. A lighting device with a microstructure brightness-enhancing film, characterized in that it comprises: a shell; a plane light source, which is fixed in the casing and has a top surface; A microstructure brightness enhancement film, which is fixed on the housing and located above the top surface of the planar light source; the microstructure brightness enhancement film is a light-transmitting thin sheet with a top, a bottom and a Fresnel light concentrating part, the bottom surface of the microstructure brightness enhancement film is a plane, the Fresnel light concentration part is located on the top of the microstructure brightness enhancement film, and the Fresnel light concentration part is provided with a center and an outer periphery , the cross-sectional shape of the Fresnel concentrating part in the vertical direction is zigzag and changes periodically from the center to the outer periphery twice or more, wherein a first period is formed in the part of the first period A light-gathering area, the first light-gathering area includes a plurality of surrounding sawtooths, the plurality of sawtooths are adjacent to each other and distributed around the center; a second light-gathering area is formed in the second period part, the The second light-gathering area surrounds and is adjacent to the first light-gathering area; the sawtooth arrangement sequence and cross-sectional shape of the second light-gathering area are the same as those of the first light-gathering area; and A reflector is fixed in the casing and surrounds the planar light source. 2. The illuminating device with microstructure brightness enhancing film according to claim 1, characterized in that: the aforementioned planar light source is provided with a center position, and the center of the aforementioned Fresnel light concentrating part is aligned with the center position of the planar light source , the maximum length of the Fresnel condensing part is greater than or equal to the maximum length of the planar light source. 3. The lighting device with microstructure brightness enhancing film according to claim 2, characterized in that: the aforementioned Fresnel light concentrating part changes periodically from the aforementioned center to the aforementioned outer periphery three times, and A third light-gathering region is formed in part of the third period. 4. The illuminating device with microstructure brightness enhancing film according to claim 1, 2 or 3, characterized in that: the cross-sectional shape of the aforementioned Fresnel light concentrating part in the horizontal direction is circular, and the aforementioned first concentrating part The light area is circular, and the aforementioned second light-gathering area and the aforementioned third light-gathering area are ring-shaped respectively. 5. The illuminating device with microstructure brightness enhancing film according to claim 4, characterized in that the aforementioned planar light source is a plurality of organic light emitting diodes arranged side by side. 6 . The lighting device with microstructure brightness enhancement film according to claim 5 , wherein the microstructure brightness enhancement film is set to allow light with a divergence angle less than or equal to 30 degrees to pass through. 7 . The lighting device with microstructure brightness enhancement film according to claim 6 , wherein the distance between the aforementioned Fresnel light concentrating part and the aforementioned planar light source ranges from 1 mm to 15 mm. 8. The illuminating device with microstructure brightness enhancing film according to claim 7, characterized in that: the aforementioned reflectors are four reflectors, each reflector is provided with a reflective surface, and each reflective surface is adjacent to the aforementioned planar light source And in a concave arc shape. 9. The illuminating device with a microstructure brightness enhancing film according to claim 1, 2 or 3, characterized in that: the cross-sectional shape of the aforementioned Fresnel light concentrating part in the horizontal direction is a square, and the aforementioned first light concentrating part The area is square. 10. The illuminating device with microstructure brightness enhancement film according to claim 1, 2 or 3, characterized in that: the cross-sectional shape of the aforementioned Fresnel light-collecting part in the horizontal direction is oval, and the aforementioned first The focus area is oval.

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