KR101561578B1 - white light emitting apparatus using blue Light-emitting diode and manufacturing method for light conversion display film thereof - Google Patents

Abstract

The present invention relates to a case having a mounting space formed therein for emitting white light by mixing color based on a blue light emitting diode device, reducing the production cost of the product and improving the quality through a high-quality color tone. A plurality of blue light emitting diode elements arranged in a predetermined space in a mounting space of the case so as to be selectively emitted by a control circuit; A phosphor layer disposed on the upper side of the blue light emitting diode device, the phosphor layer absorbing light emitted from the blue light emitting diode device to emit yellow light; And a light-transmissive resin layer which is coated on the lower surface of the phosphor layer and contains white pigment and is translucent and transmits and mixes light irradiated to the lower surface, wherein a transparent resin layer is provided on the upper side of the light- Wherein the transparent resin layer is coated on the lower surface with a predetermined display pattern and the light conversion resin layer is coated on the lower surface of the transparent resin layer coated with the shielding layer. A white light emitting device using a device is provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white light emitting device using a blue light emitting diode and a method of manufacturing the same,

The present invention relates to a white light emitting device, and more particularly, to a blue light emitting diode device which emits white light by mixing color based on a blue light emitting diode device and whose product cost is reduced and quality is improved through a high- A white light emitting device and a method for manufacturing the light conversion display film.

In general, a light-emitting diode (LED) refers to a device that emits light by pumping a current to a compound semiconductor terminal to form a p-n junction or a combination of electrons and holes in the active layer.

Such LEDs have been mainly used for various electronic devices and automobile display panels because of their advantages such as low power consumption, long lifetime, fast response speed, and good environmental friendliness. However, through the development of RGB and white LED, The trend is expanding.

On the other hand, in order to use LED as a light source for illumination, white light must be obtained. Various white light emitting devices have been developed for this purpose.

First, there is a light emitting device that realizes white by combining the luminous intensities of respective light emitting diodes emitting red, green, and blue. Here, the light emitting device may emit white light through color mixture as it emits three light emitting diodes of red, green, and blue in close proximity to each other.

However, due to the difference in electric characteristics of the respective light emitting diodes, the color tone and the brightness are changed, and it is difficult to generate white of a desired series. In other words, since each light emitting diode having different materials is different in driving power or the like, different voltages must be applied to each other, the driving circuit is complicated, the color tone is changed or uniform color mixing is not performed according to the use environment, and the cost is high .

In addition, white light has been realized by using red, blue, and green phosphors on InGaN-based light emitting diodes by using the ultraviolet light emitting diode as a light source to excite the primary color phosphors. However, appropriate phosphors have not been developed.

Finally, a method of realizing a desired color mixture through a phosphor which absorbs light emitted from a light emitting diode and emits light having a wavelength different from that of the absorbed light, absorbs a blue light emitting diode and a part of blue light emitted, emits yellow light There is a light emitting device that emits white light by mixing blue light and yellow light emitted through the phosphor.

However, in the conventional light emitting device, a YAG: Ce yellow phosphor is disposed on an upper portion of a blue light source having a wavelength range of 450 to 470 nm to emit white light by mixing a part of blue light and a yellow light emitted upon excitation of the phosphor. .

In addition, since such a phosphor forms a high price, and since the phosphor is required to be coated thickly in order to realize a white color that provides a brightness and a beauty suitable for a light source, manufacturing cost increases, which is uneconomical. In addition, since a precise operation is required in the process of applying the phosphor on the light emitting diode, the production process is complicated and the production cost is increased.

Further, since the phosphors themselves have a strong yellowish color, part of the blue light is absorbed as white, the luminescent color tone emitted through the mixture of the phosphor and the diode is limited, and the reproduction range of white light is narrow, .

Korean Patent No. 10-0517271

In order to solve the above problems, a white light emitting device using a blue light emitting diode device that emits white light based on a blue light emitting diode device based on a blue light emitting diode device, And a method of manufacturing a light conversion display film.

According to an aspect of the present invention, A plurality of blue light emitting diode elements arranged in a predetermined space in a mounting space of the case so as to be selectively emitted by a control circuit; A phosphor layer disposed on the upper side of the blue light emitting diode device, the phosphor layer absorbing light emitted from the blue light emitting diode device to emit yellow light; And a light-transmissive resin layer which is coated on the lower surface of the phosphor layer and contains white pigment and is translucent and transmits and mixes light irradiated to the lower surface, wherein a transparent resin layer is provided on the upper side of the light- Wherein the transparent resin layer is coated on the lower surface with a predetermined display pattern and the light conversion resin layer is coated on the lower surface of the transparent resin layer coated with the shielding layer. A white light emitting device using a device is provided.

The light-converting resin layer may include 24 to 34 wt% of white pigment and 66 to 76 wt% of transparent synthetic resin.

A first step of disposing a transparent resin layer provided with a transparent synthetic resin sheet; A second step of forming a shielding layer by applying an impermeable colored pigment to a predetermined display pattern along the lower surface of the transparent resin layer; A third step of coating a transparent synthetic resin containing a white pigment on the lower surface of the transparent resin layer to cover the applied shielding layer to form a photo-conversion resin layer; And a fourth step of forming a phosphor layer by applying a phosphor emitting yellow light by absorbing light emitted from the blue light emitting diode element along the lower surface of the light converting resin layer, Of the present invention.

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In the third step, the photo-conversion resin layer is coated to a thickness of 15 to 25 nm, and includes 24 to 34 wt% of a white pigment and 66 to 76 wt% of a transparent synthetic resin. In the fourth step, The phosphor layer is preferably applied in a thickness of 5 to 15 nm.

Through the above solution, the white light emitting device using the blue light emitting diode device of the present invention and the method for producing the light conversion display film thereof provide the following effects.

First, the light-converting resin layer converts light emitted from the blue light emitting diode element and the phosphor layer to white light or ice white light, which is filtered through a white dye to provide an aesthetically pleasing appearance, It is possible to switch the wavelength of the light even if only the thin phosphor layer is applied, thereby reducing the consumption amount of the expensive phosphor, and the production economical efficiency of the product can be remarkably improved.

Second, even if a conventional expensive white light emitting device is not used, the light emitted from the inexpensive blue light emitting diode device and the thin phosphor layer can be economically converted through the light converting resin layer to provide a luxurious white to ice white light It is possible to reduce the manufacturing cost remarkably.

Third, a transparent resin sheet can be formed by applying a shielding layer, a photo-conversion resin layer, and a phosphor layer sequentially on a transparent synthetic resin sheet by a silk screen printing technique to form a fine film with precise control of the thickness of each layer, The manufacturing process of the light conversion display film and the process of manufacturing the white light emitting device by combining the case with the blue light emitting diode device and the photo conversion film manufactured in the past can be performed separately and the productivity of the product can be improved.

1 is a cross-sectional view illustrating a white light emitting device using a blue light emitting diode device according to an embodiment of the present invention.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a white light emitting device.
FIG. 3 is an exemplary view illustrating a phosphor layer applied to a rear surface of a light-converting resin layer in a white light emitting device using a blue light emitting diode device according to an embodiment of the present invention. FIG.
FIG. 4 is a graph illustrating changes in color development of a blue light emitting diode device by a light conversion display film according to an embodiment of the present invention. FIG.
5 is a flowchart illustrating a method of manufacturing a light conversion display film according to an embodiment of the present invention.

Hereinafter, a white light emitting device using a blue light emitting diode according to a preferred embodiment of the present invention and a method of manufacturing the light conversion display film thereof will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view illustrating a white light emitting device using a blue light emitting diode device according to an embodiment of the present invention. FIG. 2 is a view illustrating a case of a white light emitting device using a blue light emitting diode device according to an embodiment of the present invention. FIG. 3 is a view illustrating an example in which a phosphor layer is coated on a rear surface of a light-converting resin layer in a white light emitting device using a blue light emitting diode device according to an embodiment of the present invention. FIG. FIG. 5 is a flowchart illustrating a method of manufacturing a light conversion display according to an exemplary embodiment of the present invention. Referring to FIG.

1 to 5, the white light emitting device 100 using the blue light emitting diode device includes a case 10, a blue light emitting diode device 20, a light converting resin layer 33, and a phosphor layer 34 ).

The white light emitting device 100 using the blue light emitting diode device 20 converts blue light emitted from the blue light emitting diode device 20 into white light and emits white light.

At this time, a part of the blue light is absorbed by the phosphor layer 34 and is emitted as yellow light, and the blue light and the yellow light pass through the light conversion resin layer 33 to form an ice white- It can be emitted as light.

Referring to FIG. 2, the case 10 has a mounting space 11 formed therein. A plurality of mounting spaces 11 may be formed in the case 10 and an upper surface of the mounting space 11 may be opened to allow the blue LED device 20 to be inserted.

A light conversion display film 30 including the light conversion resin layer 33 and the phosphor layer 34 is coupled to the upper surface 13 of the case so that light emitted from the blue light emitting diode device 20 Can be converted to white and released.

Here, the blue light of each blue light emitting diode device 20 emitted from each of the mounting spaces 13 may be separately emitted by the case 10. In this case, when the respective blue light emitting diode elements 20 are selectively lighted by the control circuit, the light emission of one blue light emitting diode element does not appear as the light emission of the other adjacent blue light emitting diode elements It is preferable to understand that the case 10 divides the sides of each blue light emitting diode device and shields them.

Of course, the mounting space 11 may be formed to have a size into which a plurality of blue light emitting diode elements 20 can be inserted. At this time, a plurality of blue light emitting diode elements 20 are inserted and arranged in the mounting space 11, and partition walls partitioning the respective blue light emitting diode elements 20 are formed.

The plurality of blue light emitting diode elements 20 are arranged in a predetermined space in the mounting space 11 of the case 10 so as to be selectively emitted by the control circuit. Here, the selective emission means that each blue LED device 20 can be independently turned on or off by an electrical signal of the control circuit.

At this time, it is preferable that the blue light emitting diode device 20 is made of gallium nitride (GaN) thin film as the optical semiconductor, and the wavelength of the emitted light is set to 400 to 530 nm.

The blue light emitting diode devices 20 may be arranged in a predetermined shape corresponding to the formation of the respective mounting spaces 11 inserted into the respective mounting spaces 11 of the case 10, It is also possible that a plurality of blue light emitting diode elements 20 are inserted into one mounting space 11 and arranged in a predetermined configuration.

In this case, when a plurality of blue light emitting diode elements 20 are arranged in one mounting space 11, the light emitted from each of the blue light emitting diode elements 20 is separated from each other, And a barrier rib which shields the barrier ribs.

In detail, the blue light emitting diode device 20 is disposed inside the mounting space 11, and the n-side electrode and the p-side electrode are connected to the control circuit so as to be turned on when power is supplied and turned off when the power is turned off .

A reflective plate 12 may be disposed on the side of each of the blue LED devices 20 and the reflective plate 12 may reflect light emitted toward both sides of the blue LED device 20 upward .

1 to 4, the light-converting resin layer 33 is disposed on the upper side of the blue light emitting diode device 20, and includes a white pigment, Light is emitted and mixed. The phosphor layer 34 is preferably applied to a surface of the light conversion resin layer 33, that is, a surface facing the blue light emitting diode 20.

At this time, light not absorbed by the phosphor layer 34 of the light emitted from the blue light emitting diode element 20 and light emitted from the phosphor layer 34 are irradiated to the light conversion resin layer 33 .

The two kinds of light to be irradiated are mixed in the light converting resin layer 33 and the mixed light passes through the light converting resin layer 33 and is filtered by the white pigment to be converted into white light have. Here, it is preferable that the white light is understood to be an ice white-based white light having a faint blue stain.

The light converting resin layer 33 is spaced apart from the blue light emitting diode elements 20 by a predetermined distance so that light diffused from the light emitted from the blue light emitting diode elements 20 spreads to both sides of the case 10 ) Or the shielding layer 32, and the light having the linearity may pass through the shielding layer 32 and be emitted to the outside.

Since the light emitted from the blue light emitting diode device 20 is directly irradiated and emitted to the outside through the light conversion resin layer 33, dispersion is prevented so that when the predetermined pattern is displayed between the shielding layers 32, Can be improved.

The phosphor layer 34 applied to the lower surface of the photo-conversion resin layer 33 is insulated from the blue light-emitting diode element 20 by the separation between the light-converting resin layer 33 and the blue light- Deterioration and deformation due to heat generated when light is emitted can be prevented and the durability of the product can be improved.

1 to 3, the phosphor layer 34 is coated on the lower surface of the light converting resin layer 33, and absorbs light emitted from the blue light emitting diode element 20, Release.

The phosphor layer 34 is disposed between the blue light emitting diode device 20 and the light converting resin layer 33 and absorbs a part of the blue light emitted from the blue light emitting diode device 20, It is possible to emit yellow light.

The light emitted from the blue light emitting diode element 20 and not absorbed by the phosphor layer 34 is irradiated to the light converting resin layer 33 and is emitted from the phosphor layer 34, ≪ / RTI >

Here, the phosphor layer 34 may be formed by applying a phosphor, and the phosphor may be a YAG phosphor that is a garnet-type phosphor developed by Nichia Corporation of Japan or a phosphor of the same kind. At this time, the yellow light emitted from the YAG fluorescent material may have a wavelength of 560 nm.

The phosphor layer 34 is formed by applying the YAG fluorescent material (chemical formula: Y ₃ Al ₅ O ₁₂ : Ce ³⁺ (YAG: Ce)) along the lower surface of the light conversion resin layer 33 by a silk screen printing technique .

As described above, the light-converting resin layer 33 mixes blue light emitted from the blue light emitting diode element 20 and yellow light emitted from the phosphor layer 34 at a lower price than the tricolor light emitting diode element, So that the light can be converted into white to ice white light that provides an aesthetically pleasing appearance.

Furthermore, even if a thin phosphor layer is applied by filtering through a white dye, it is possible to switch the wavelength of light, so that the consumption of expensive phosphors can be remarkably reduced.

Accordingly, it is possible to provide an economical white light emitting device, and to emit white light of a luxurious ice white system having high luminance and readability, thereby improving production economics and quality of products.

The light-converting resin layer 33 may include 24 to 34 wt% of a white pigment and 66 to 76 wt% of a transparent synthetic resin. Here, the transparent synthetic resin is preferably provided by at least one of polyethersulfone (PES) and polyethylene (PE).

When the white pigment is less than 24 wt% and the transparent synthetic resin is more than 76 wt%, the light emitted from the blue light emitting diode 20 and the phosphor layer 33 is mixed with the white pigment The blue light is excessively colored at a high color temperature, causing glare and releasing low color rendering light.

On the other hand, when the white pigment exceeds 34 wt% and the transparent synthetic resin is less than 66 wt%, the light emitted from the blue light emitting diode device 20 and the phosphor layer 33 is mixed with the white pigment There is a fear that the luminance is excessively filtered and the luminance is decreased, and visibility and readability are lowered.

That is, the light-converting resin layer 33 of the present invention can mix and emit light emitted from the blue light emitting diode element 20 and the phosphor layer 33 to convert light emitted to the outside into white light suitable for a light source have.

Further, even if the phosphor layer 34 is thinned by filtering with the white dye to reduce the ratio of the yellow light, the color temperature of the light emitted to the outside can be suitably lowered, thereby emitting white light as an efficient light source, Can be adjusted to ice white to provide high brightness and color rendering, and can provide high-quality white light without glare.

Furthermore, since the light-converting resin layer 33 can reduce the dependence of the wavelength of the light emitted from the blue light emitting diode element 20 on the phosphor layer 34, the consumed amount of the YAG fluorescent material with a high unit cost can be reduced, Can be improved, and the production cost of the product can be reduced by 70% or more.

On the other hand, a transparent resin layer 31 is provided on the upper side of the photo-conversion resin layer 33, a shielding layer 32 is coated on the lower surface of the transparent resin layer 31 along a predetermined display pattern, The converted resin layer 33 is preferably provided on the lower surface of the transparent resin layer 31 to which the shielding layer 32 is applied.

1, the transparent resin layer 31 is disposed so as to expose the upper surface of the transparent resin layer 31, and the light shielding layer 32 is formed by a silk screen printing technique or the like, The resin layer 33, the phosphor layer 34, and the like may be sequentially formed.

The transparent resin layer 31 has high heat resistance and impact resistance so as to protect the light conversion resin layer 33 from the outside, and the light emitted from the light conversion resin layer 33 is smoothly transmitted to the outside. And may be formed of a synthetic resin having high permeability, and may be formed of any one of polyethylene terephthalate (PET) and polycarbonate (PC).

In addition, a shielding layer 32 may be coated on the lower surface of the transparent resin layer 31 along a predetermined display pattern. The predetermined display pattern means that the light emitted to the outside through the light converting resin layer 33 is displayed in a shape including recognizable information such as letters, numbers, and figures. For this purpose, the shielding layer 32, It is preferable to shield the portion except the shape.

For example, in the case of a variable number display showing numbers from 0 to 9, four vertical display portions are formed along the three sides of the horizontal display portion and the horizontal display portion arranged in the upper, middle, and lower, Seven LEDs selectively illuminated at the bottom of the vertical display unit can represent a number corresponding to a decimal number according to selective light emission.

At this time, the horizontal display portion and the vertical display portion are light emitting portions, and a shielding layer 32 may be provided in a peripheral region so that the predetermined display pattern becomes a predetermined display pattern.

Of course, in the case of an electric rice cooker, various types of predetermined display patterns such as "open", "closed", "warm" or "cooked" and a shielding layer 32 for partitioning and displaying these may be provided.

Here, the shielding layer 32 may be formed by performing silk screen printing using a transparent synthetic resin sheet forming the transparent resin layer 31 as a target, using an impermeable colored pigment as a paste.

The light-converting resin layer 33 may be printed on the lower surface of the transparent resin layer 31 coated with the shielding layer 32 through a silk screen printing technique. That is, after the shielding layer 32 is applied and dried, the transparent resin layer 31 exposed through the shielding layer 32 and the lower surface of the shielding layer 32, (33) can be applied. At this time, the paste used for silk screen printing at the time of forming the photo-conversion resin layer 33 may be a mixture of white pigment and transparent synthetic resin.

When the light conversion resin layer 33 is formed, the phosphor layer 34 may be formed on the lower surface of the light conversion resin layer 33 along the exposed portion between the shielding layers 32.

The thickness of each layer can be precisely controlled by sequentially applying each layer to the lower surface of the transparent resin layer 31 through a silk screen printing technique, The pattern can be expressed and the quality of the product can be improved.

The transparent resin layer 31, the shielding layer 32, the light-converting resin layer 33, the fluorescent material layer 33, and the fluorescent material layer 33 may be formed on the blue light emitting diodes 20, The light conversion display film 30 including the layer 34 is integrally manufactured so that the light conversion film 30 is manufactured and the blue light emitting diode device 20 is installed in the case 10, The process of combining the light conversion display film 30 can be performed separately and in parallel, so that the productivity of the product can be improved.

5, a light conversion display film 30 of a white light emitting device 100 using a blue light emitting diode device 20 according to a preferred embodiment of the present invention can be manufactured through the following steps .

The light conversion display film 30 includes a transparent resin layer 31, a shielding layer 32, a photo-conversion resin layer 33, and a phosphor layer 34 as a concept including the photo-conversion resin layer 33. [ Are successively applied and formed in the form of a film. At this time, the light conversion display film 30 may emit white light by converting the wavelength of light emitted from the blue light emitting diode device 20.

First, a transparent resin layer 31 provided with a transparent synthetic resin sheet is disposed. At this time, the transparent synthetic resin sheet is preferably formed to cover the upper surface of the case 10 in which the blue light emitting diode devices 20 are arranged.

An opaque colored pigment is coated on the lower surface of the transparent resin layer 31 in a predetermined display pattern to form a shielding layer 32. At this time, the shielding layer 32 shields a part of light emitted to the outside through the light-converting resin layer 33, and transmits light emitted to the outside through the portion where the shielding layer 32 is not formed. And can be represented by a set display pattern.

Thereafter, a transparent synthetic resin containing a white pigment is applied on the lower surface of the transparent resin layer 31 so as to cover the applied shielding layer 32 to form a photo-conversion resin layer 33. At this time, the light-converting resin layer 33 mixes the light emitted from the phosphor layer 34 and the light emitted from the blue light emitting diode device 20, filters the white light through the white pigment, .

At this time, the light passing through the light-converting resin layer 33 is partially shielded by the shielding layer 32, is emitted to the outside through the transparent transparent resin layer 33 and displays a predetermined display pattern .

Finally, a phosphor layer 34 is formed by applying a phosphor that emits yellow light by absorbing light emitted from the blue light emitting diode element 20 along the lower surface of the light converting resin layer 33.

Here, the phosphor means a YAG fluorescent substance developed by Nichia Corporation of Japan. The fluorescent substance absorbs light of a blue wavelength region emitted from the blue light emitting diode device 20, It is possible to emit light of a wavelength.

The blue light that is not absorbed by the phosphor layer 34 and the yellow light emitted from the phosphor layer 34 are mixed in the light conversion resin layer 33 and white light is emitted as the light is filtered by the white pigment. Can be released.

In this case, since the phosphor layer 34 is embedded in a separate resin and is not bonded to the light conversion resin layer 33 but is applied by a silk screen printing technique, the phosphor layer 34 is thinly coated on the lower surface of the light conversion resin layer 33 And a separate resin layer is not formed, so that it is possible to prevent a decrease in brightness of light with a high transmittance.

As described above, the light conversion display film 30 is formed not by separately adhering each layer but by attaching the transparent resin layer 31 made of the transparent synthetic resin sheet to the lower surface of the silk Screen printing, so that the thickness of each layer can be formed into a finely adjusted film, thereby making the product compact.

Accordingly, it is possible to manufacture a high-quality light emitting device by precisely controlling the change in characteristics of light emitted to the outside by the refractive index difference of each layer, and to produce economically without waste of raw materials consumed in forming each layer Do.

At this time, the light-converting resin layer 33 is applied in a thickness of 15 to 25 nm, and the phosphor layer 34 is preferably applied in a thickness of 5 to 15 nm.

When the thickness of the light conversion resin layer 33 exceeds 25 nm, light emitted from the blue light emitting diode element 20 and the phosphor layer 34 is transmitted through the light conversion resin layer 33 There is a fear that the ratio is reduced and the amount of light emitted to the outside is reduced, so that sufficient readability can not be provided.

When the thickness of the light converting resin layer 33 is less than 15 nm, the light emitted from the blue light emitting diode element 20 and the phosphor layer 34 is absorbed by the white dye in the light converting resin layer 33 And blue light having a wavelength shorter than the wavelength of light for use as a light source may be emitted.

When the phosphor layer 34 is less than 5 nm, the ratio of light absorbed by the phosphor of the phosphor layer 34 among the light emitted from the blue light emitting diode element 20 is reduced, and the light conversion resin layer 33 ), There is a fear that white light close to the blue light that causes glare may be emitted.

When the phosphor layer 34 is more than 15 nm, the ratio of light absorbed through the phosphor layer 34 of the light emitted from the blue light emitting diode element 20 increases, So that the color temperature is lowered and white light close to yellow which may cause eye fatigue may be emitted.

The phosphor layer 34 is preferably 45 to 55 wt% of the transparent synthetic resin forming the light conversion resin layer 33.

The method of manufacturing the white light emitting device 100 using the blue light emitting diode device 20 includes the steps of arranging and installing the blue light emitting diode device 20 in a predetermined space in the mounting space 11 of the case 10 And a light conversion display film 30 manufactured on the upper surface 13 of the case 10.

In detail, the case 10 may have a mounting space 11 formed therein, and the blue light emitting diode device 20 may be inserted through the opening of the mounting space 11.

At this time, a substrate on which a control circuit is printed may be provided under the mounting space 11, and an electrode of the blue light emitting diode device 20 may be connected to the substrate.

The white light emitting device may be manufactured by coupling the light conversion display film 30 along the upper edge of the mounting space 11. [ Here, the light conversion display film 30 may be bonded to the upper surface of the case 10 by applying and bonding a bond or a binder.

At this time, in the light conversion display film 30, a portion of the light-converting resin layer 33, which is not shielded by the shielding layer 32, is disposed opposite to the upper side of the blue light emitting diode device 20 And the consumed amount of the phosphor can be minimized when the phosphor is applied along the unshielded portion by the shielding layer 32.

As described above, the white light emitting device 100 converts blue light emitted from the blue light emitting diode device 20, which is economical at a relatively low cost, into white light suitable for a light source. Since the white light is emitted by filtering through a white dye, The wavelength dependency of the phosphor layer 34 is low, and the manufacturing cost can be reduced.

In addition, since the light conversion display film 30 is integrally formed by sequentially applying a shielding layer, a photo-conversion resin layer, and a phosphor layer to the transparent resin layer, The process of arranging the devices and manufacturing the white light emitting device by combining the manufactured photo conversion display films can be performed in parallel and the productivity of the product can be improved.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

100: white light emitting device 10: case
11: mounting space 12: reflector
20: blue light emitting diode element 30: light conversion display film
31: transparent resin layer 32: shielding layer
33: photo-conversion resin layer 34: phosphor layer

Claims (5)

A case having a mounting space formed therein;
A plurality of blue light emitting diode elements arranged in a predetermined space in a mounting space of the case so as to be selectively emitted by a control circuit;
A phosphor layer disposed on the upper side of the blue light emitting diode device, the phosphor layer absorbing light emitted from the blue light emitting diode device to emit yellow light; And
And a light-converting resin layer that is coated on the lower surface of the phosphor layer and includes a white pigment and is translucently provided to transmit and mix light emitted from the lower surface,
Wherein a transparent resin layer is provided on the upper side of the photo-conversion resin layer, a shielding layer is coated on a lower surface of the transparent resin layer along a predetermined display pattern, and the light-converting resin layer comprises a transparent resin layer Wherein the blue light emitting diode is provided on the lower surface of the substrate. The method according to claim 1,
Wherein the light-converting resin layer comprises 24 to 34 wt% of a white pigment and 66 to 76 wt% of a transparent synthetic resin. delete A first step of disposing a transparent resin layer provided with a transparent synthetic resin sheet;
A second step of forming a shielding layer by applying an impermeable colored pigment to a predetermined display pattern along the lower surface of the transparent resin layer;
A third step of coating a transparent synthetic resin containing a white pigment on the lower surface of the transparent resin layer to cover the applied shielding layer to form a photo-conversion resin layer; And
And a fourth step of forming a phosphor layer by applying a phosphor emitting yellow light by absorbing light emitted from the blue light emitting diode element along the lower surface of the light converting resin layer. A method for manufacturing a photoconversion display film. 5. The method of claim 4,
In the third step, the light-converting resin layer is coated to a thickness of 15 to 25 nm, and includes 24 to 34 wt% of a white pigment and 66 to 76 wt% of a transparent synthetic resin,
Wherein the phosphor layer is applied in a thickness of 5 to 15 nm in the fourth step. ≪ RTI ID = 0.0 > 15. < / RTI >

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