TWI452231B - A lighting device withGPP brightening film - Google Patents

Description

Illuminating device with microstructured brightness enhancing film

The present invention relates to an illuminating device, and more particularly to a illuminating device having a microstructured brightness enhancing film.

At present, a general planar light source is projected, and the projected light source field is Lambertian, that is, a Lambertian light source. The divergence angle of the light emitted by the planar light source is large, which easily causes the disadvantage of poor luminous efficiency and low central luminous intensity. When applied to a lighting device such as a taillight, multiple OLEDs [organic light-emitting diodes] are required. Meeting regulatory requirements for lighting brightness can significantly increase manufacturing costs.

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

In order to solve the prior art illuminating device using a planar light source, which has insufficient luminous efficiency, low central illuminating intensity, and increased manufacturing cost, an object of the present invention is to provide an illuminating device having a microstructure-enhancing film. It is provided with a microstructure-enhanced brightening film, and the sawtooth-shaped Fresnel concentrating portion of the microstructure-enhanced film has a periodic change of more than two times, and cooperates with the arrangement of the reflector to effectively focus the light and improve the luminous efficiency. Increasing the central luminous intensity and reducing the number of OLEDs used in the planar light source, thereby reducing the manufacturing cost, and the utility is excellent.

The technical means used in the present invention is to provide a lighting device having a microstructured brightness enhancing film, comprising: a casing; a planar light source fixed in the casing and provided with a top surface; a microstructure brightness enhancing film, The utility model is fixed on the casing and located above the top surface of the planar light source; the microstructure brightness enhancement film is a thin film body capable of transmitting light and is provided with a top portion, a bottom surface and a Fresnel concentrating portion. The bottom surface of the microstructure-enhancing film is a plane, the Fresnel concentrating portion is located at the top of the microstructure-enhancing film, and the Fresnel concentrating portion is provided with a center and an outer circumference, and the Fresnel concentrating light The cross-sectional shape of the portion in the vertical direction is serrated and periodically changes from the center toward the outer periphery by two or more periodic periods, wherein a first concentrating region is formed in a portion of the first period, the first The concentrating region includes a plurality of surrounding serrations, the plurality of serrations abut each other and distributed around the center; a second concentrating region is formed in a portion of the second period, and the second concentrating region surrounds Adjacent to the first concentrating zone; the sawtooth of the second concentrating zone The order, are the same as the cross-sectional shape of the first condensing zone; and a reflector, which is fixed in the housing and surrounding the light source to the plane.

The illumination device with a microstructured brightness enhancement film, wherein the planar light source is provided with a central position, and the center of the aforementioned Fresnel concentrating portion is aligned with the center position of the planar light source, and the Fresnel concentrating portion is The maximum length is greater than or equal to the maximum length of the planar light source.

The illuminating device having a microstructure-enhanced brightness enhancing film, wherein the aforementioned Fresnel concentrating portion changes three times periodically from the center toward the outer periphery, and is formed in a portion of the third cycle. A third concentrating zone.

In the illumination device having the microstructure-enhanced brightness enhancement film, the aforementioned Fresnel concentrating portion has a circular cross-sectional shape in the horizontal direction, the first concentrating region is circular, and the second concentrating region and The aforementioned third concentrating regions are respectively annular.

The illumination device with a microstructured brightness enhancement film, wherein the planar light source is a plurality of side-by-side organic light-emitting diodes.

The illuminating device having a microstructure-enhancing film, wherein the aforementioned microstructure-enhancing film is configured to pass light having a divergence angle of 30 degrees or less.

In the illumination device having the microstructure-enhanced brightness enhancement film, the distance between the Fresnel concentrating portion and the planar light source described above is in the range of 1 mm or more and 15 mm or less.

The illuminating device with a microstructure-enhancing film, wherein the reflector is four reflectors, each reflector is provided with a reflecting surface, and each reflecting surface is adjacent to the planar light source and has a concave arc shape.

In the illumination device having the microstructure-enhanced brightness enhancement film, the cross-sectional shape of the aforementioned Fresnel concentrating portion in the horizontal direction is square, and the first condensing area is square.

In the illumination device having the microstructure-enhanced brightness enhancement film, the cross-sectional shape of the Fresnel concentrating portion in the horizontal direction is elliptical, and the first concentrating region is elliptical.

The specific benefits and enhancements that can be obtained by the illumination device with the microstructure-enhanced film provided by the present invention include: due to the periodic variation of the sawtooth-shaped Fresnel concentrating portion of the microstructure-enhancing film, more than two times, And with the arrangement of the reflector, the light can be effectively focused, the luminous efficiency is improved, the central luminous intensity is increased, and the number of OLEDs used in the planar light source is reduced, thereby reducing the manufacturing cost and being practical.

In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the contents of the specification, the following is further described in detail with reference to the preferred embodiments as illustrated in the accompanying drawings. A first preferred embodiment of the illuminating device for brightness enhancing film, as shown in FIG. 1, includes: a housing 10, a planar light source 30, a microstructure brightness enhancing film 50 and a reflector 70, etc., wherein: As shown in FIG. 1, the housing 10 is hollow, and the housing 10 is a prior art member, and is not the focus of the present invention, and its detailed structure is not described herein.

As shown in FIG. 1 and FIG. 2, the planar light source 30 is horizontally fixed in the casing 10 and is provided with 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 FIG. 1 and FIG. 2, the microstructure-enhancing film 50 is fixed on the top of the casing 10 and located above the top surface of the planar light source 30. The microstructure-enhancing film 50 is a thin light-transmissive film. The rectangular plate body is provided with a top portion, a bottom surface and a Fresnel concentrating portion 51; the bottom surface of the microstructure brightness enhancing film 50 is a plane; the Fresnel concentrating portion 51 is located at the microstructure brightness enhancing film 50 The top portion of the Fresnel concentrating portion 51 has a circular cross-sectional shape in the horizontal direction, and the cross-sectional shape of the Fresnel concentrating portion 51 in the vertical direction is zigzag and is two or more times from the center of the circle toward the circumference. Periodically changing, wherein a portion of the first period forms a circular first concentrating region 511, the first concentrating region 511 includes a plurality of adjacent serrations 5111, and the plurality of serrations 5111 are annular The center of the Fresnel concentrating portion 51 is concentrically distributed; the first concentrating region 511 is a Fresnel lens of the prior art, and the detailed structure thereof is not described; in the second cycle Part of the second concentrating area 513 is formed, and the second concentrating area 513 surrounds and is adjacent to the first concentrating area The 511 is arranged in the same manner as the first concentrating region 511, and is not described here, and the Fresnel concentrating portion 51 is periodically changed. Therefore, the radial length of the second concentrating zone 513 is the same as the radial length of the first concentrating zone 511; since the planar light source 30 can be seen as having a plurality of point sources integrated in one block, by a plurality of [two or more] The concentrating area is capable of concentrating the point light sources at different positions. In other words, the periodic variation of the Fresnel concentrating portion 51 can be applied to the planar light source 30 to achieve the purpose of concentrating light.

Preferably, the Fresnel concentrating portion 51 changes three times periodically from the center of the circle toward the circumference, and forms a ring-shaped third concentrating region 515 at a portion of the third period, the third concentrating light The arrangement order and the cross-sectional shape of the sawtooth 5151 of the region 515 are the same as those of the first concentrating region 511; preferably, the center of the Fresnel concentrating portion 51 is aligned with the center position of the planar light source 30; preferably, The diameter of the Fresnel concentrating portion 51 is greater than or equal to the maximum length of the planar light source 30, and the distance between the Fresnel concentrating portion 51 and the planar light source 30 is 1 mm or more and 15 mm or less; thereby, the planar light source 30 Most of the light can be directed to the Fresnel concentrating portion 51 for better convergence.

As shown in FIG. 1 and FIG. 3, the reflector 70 is fixed in the casing 10 and surrounds the planar light source 30. Preferably, the reflector 70 is four reflectors, and each reflector is provided with a reflecting surface 71. Each reflecting surface 71 is adjacent to the planar light source 30 and has a concave arc shape.

As shown in FIG. 2 and FIG. 3, the illumination device with the microstructure brightness enhancement film of the present invention is a taillight in the first preferred embodiment, and the planar light source 30 emits light, wherein the planar light source 30 is separated from the microstructure. The brightness enhancement film 50 is very close, so most of the light from the planar light source 30 will be directed to the microstructured brightness enhancement film 50; and depending on the optical properties of refraction and total reflection, the microstructured brightness enhancement film 30 will have a divergence angle of 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, and the light having a divergence angle greater than 30 degrees is folded back to the planar light source 30, [the divergence angle defined by the present invention is as shown in the figure θ _{r of} 2, that is, the angle between the normal of any point on the Fresnel concentrating portion 51 and the refracted ray that refracts the microstructure-enhancing film 50, that is, the so-called refraction angle]; the ray having a divergence angle of more than 30 degrees After a plurality of reflections, the light can be emitted until the incident angle of the light is less than or equal to a predetermined angle; the light of other portions of the planar light source 30 is incident on the reflector 70, and the convergence effect is achieved by the concave curved reflecting surface 71. And shooting upwards; by the invention The brightness enhancing film structure 50 and the reflector 70, the planar light source 30 can emit light to form a narrow beam pattern [shown in Figure 4], in line with requirements of the optical type vehicle taillights regulations.

It is added here that, in combination with the size of the light-emitting area of the planar light source 30, the present invention can appropriately adjust the pitch of the period of the Fresnel concentrating portion 51, that is, the length of the radial length of the concentrating regions 511, 513, 515 to achieve optimal aggregation. Light effect; for example, as shown in FIG. 2, the radiant area has a radial length D, the distance between the planar light source 30 and the microstructured brightness enhancing film 50 is Z, and the planar light source 30 passes the D/2 normal and the poly The angle of the edge of the light zone [only indicated in the second light collecting zone 513] is θ, so D = 2Z * tan θ, wherein, in the first preferred embodiment of the present invention, θ is between 25 degrees and 60 degrees. Between degrees, and Z is between 1mm and 15mm, and the smaller Z is, the smaller the θ and D need to be designed; the Fresnel concentrating area 51 of the present invention can reach the planar light source as long as there is a periodic change. The effect of 30 concentrating light, the present invention does not impose any particular limitation on the values of Z, θ, and D.

In the first preferred embodiment of the present invention, 13 red OLEDs [Organic Light-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 [Luminous Intensity], the unit is [cd]; the broken line is the luminous intensity distribution of the unstructured brightness enhancement film 50, and the solid line is the use of the microstructure brightness enhancement film. The luminous intensity distribution after 50; the central luminous intensity of the unused microstructure-enhancing film 50 is about 30.5 cd, and the central luminous intensity of the microstructure-enhancing film 50 is about 67.6 cd, thereby achieving the concentrating effect and conforming to the vehicle. Taillight brightness requirements.

The illuminating device with the microstructure-increasing film of the present invention is implemented in a taillight, and the present invention can also be implemented in a desk lamp, a side lamp, or the like to achieve the effect of concentrating, and the present invention is not specific to the field of application and use. limit.

As shown in FIG. 5, a second preferred embodiment of the illumination device having a microstructure-enhanced film of the present invention is substantially the same as the first preferred embodiment described above, wherein the Fresnel concentrating portion 51A is horizontal The cross-sectional shape of the direction is a square, and the first condensing area 511A is a square.

As shown in FIG. 6, a third preferred embodiment of the illumination device of the present invention having a microstructure-enhancing film is substantially the same as the first preferred embodiment described above, wherein the Fresnel concentrating portion 51B is horizontal. The cross-sectional shape of the direction is elliptical, and the first concentrating area 511B is elliptical.

It can be seen from the second preferred embodiment and the third preferred embodiment that the Fresnel concentrating portions 51, 51A, 51B of the present invention may be square, rectangular, elliptical or other shapes and are not limited to circular shapes. The shape of the Fresnel concentrating portions 51, 51A, 51B is not particularly limited in the present invention.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the simple equivalent changes and modifications made by the scope of the present invention and the contents of the specification are all It should remain within the scope of the invention patent.

10. . . case

30. . . Planar light source

50. . . Microstructured brightness enhancement film

51 51A 51B. . . Fresnel concentrating department

511 511A 511B. . . First concentrating zone

5111. . . Sawtooth

513. . . Second concentrating zone

5131. . . Sawtooth

515. . . Third concentrating zone

5151. . . Sawtooth

70. . . Reflector

71. . . Reflective surface

θ _r . . . Divergence angle

D. . . Radial length of the concentrating zone

Z. . . Distance between planar light source and microstructured brightness enhancement film

θ. . . Angle

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partial perspective cross-sectional view showing a first preferred embodiment of the present invention.

2 is a schematic view showing the light of the first preferred embodiment of the present invention directed to the Fresnel concentrating portion.

Figure 3 is a schematic illustration of light rays directed at a reflector in accordance with a first preferred embodiment of the present invention.

Figure 4 is a partial perspective cross-sectional view showing a first preferred embodiment of the present invention.

Figure 5 is a partial perspective cross-sectional view showing a Fresnel concentrating portion in accordance with a second preferred embodiment of the present invention.

Figure 6 is a partial perspective cross-sectional view showing a Fresnel concentrating portion in accordance with a third preferred embodiment of the present invention.

10. . . case

30. . . Planar light source

50. . . Microstructured brightness enhancement film

51. . . Fresnel concentrating department

511. . . First concentrating zone

513. . . Second concentrating zone

515. . . Third concentrating zone

70. . . Reflector

Claims (9)

An illumination device having a microstructure-enhanced brightness enhancement film, comprising: a casing; a planar light source fixed in the casing and provided with a top surface, the planar light source being a plurality of side-by-side organic light-emitting diodes; a structural brightness enhancement film is fixed on the casing and located above the top surface of the planar light source; the microstructure brightness enhancement film is a thin film body capable of transmitting light and is provided with a top, a bottom surface and a Fresnel a concentrating portion, the bottom surface of the microstructure-enhancing film is a plane, the Fresnel concentrating portion is located at the top of the microstructure-enhancing film, and the Fresnel concentrating portion is provided with a center and an outer circumference. The cross-sectional shape of the Fresnel concentrating portion in the vertical direction is serrated and periodically changes from the center toward the outer periphery by two or more periodic changes, wherein a first concentrating light is formed in a portion of the first period The first concentrating region includes a plurality of surrounding serrations, the plurality of serrations abut each other and are distributed around the center; a second concentrating region is formed in a portion of the second period, the second a concentrating zone surrounding and adjacent to the first concentrating zone; the second concentrating The order of the saw teeth area, cross-sectional shape are the same as the first condensing zone; and a reflector, which is fixed in the housing and surrounding the light source to the plane. The illumination device with a microstructure-enhanced brightness enhancement film according to claim 1, wherein the planar light source is provided with a central position, and a center of the aforementioned Fresnel concentrating portion is aligned with a central position of the planar light source. The maximum length of the Fresnel concentrating portion is greater than or equal to the maximum length of the planar light source. An illumination device having a microstructure-enhanced brightness enhancement film according to claim 2, wherein the Fresnel concentrating portion has a periodic variation of three times from the center toward the outer periphery of the foregoing, and Three cycles The portion forms a third concentrating zone. The illuminating device having a microstructure-increasing film according to claim 1 or 2 or 3, wherein the Fresnel concentrating portion has a circular cross-sectional shape in a horizontal direction, and the first concentrating region is The circular shape, the aforementioned second concentrating zone and the aforementioned third concentrating zone are respectively annular. The illuminating device having a microstructure-increasing film according to claim 4, wherein the aforementioned microstructure-increasing film is configured to pass light having a divergence angle of 30 degrees or less. The illuminating device having a microstructure-increasing film according to claim 5, wherein the distance between the Fresnel concentrating portion and the planar light source is 1 mm or more and 15 mm or less. The illuminating device with a microstructure-increasing film according to claim 6, wherein the reflector is four reflectors, and each reflector is provided with a reflecting surface, and each reflecting surface is adjacent to the planar light source. Concave arc. An illumination device having a microstructure-enhanced brightness enhancement film according to claim 1 or 2 or 3, wherein the aforementioned Fresnel concentrating portion has a square shape in a horizontal direction, and the first concentrating region is square. An illumination device having a microstructure-enhanced brightness enhancement film according to claim 1 or 2 or 3, wherein the aforementioned Fresnel concentrating portion has an elliptical cross-sectional shape in a horizontal direction, and the first concentrating region It is oval.