KR101453470B1 - Light guide plate and light emitting apparatus including the same - Google Patents

Abstract

A light emitter plate including a light incoming portion through which light emitted from the light source is incident, a light exiting portion facing the light entering portion, and a light exit surface connecting an upper side of the light entering portion and an upper side of the opposite light portion, And a pattern layer formed on an opposite surface of the emission surface, wherein the pattern layer includes a light guide plate including colored particles for controlling a color coordinate deviation of light emitted from the light-incident portion and light emitted from the light-facing portion, and a face light- .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light guide plate,

The present invention relates to a light guide plate of a surface light emitting device.

Recently, with the rapid growth of the display market, research and development on next generation displays such as PDP, TFT-LCD as well as organic EL and the like are being actively carried out for improvement of parts performance and improvement of manufacturing process.

Among them, the liquid crystal used in the TFT-LCD can not emit light itself, so a separate light source is necessarily required. A backlight unit serves as a backlight source of the TFT-LCD panel.

In the backlight unit of the backlight unit, light emitted from a light source in the form of a point light source such as an LED arranged on the side of the light guide plate is converted into a planar light source by the light guide plate, and light emitted from the light guide plate is incident on the LCD panel side.

However, since the light source is disposed on the side surface of the light guide plate, there is a problem that the color coordinates of the light emitted from the region adjacent to the light source and the light emitted from the region far from the light source differ from each other.

The present invention provides a light guide plate capable of adjusting a color coordinate deviation of light to be emitted and a face light fixture including the light guide plate.

A light guide plate according to an embodiment of the present invention includes a light entrance portion into which light emitted from a light source is incident, a light exit portion facing the light entrance portion, and a light exit surface connecting the upper side of the light entrance portion and the upper side of the light- A light emitter plate; And a pattern layer formed on a side opposite to the light emission surface, wherein the pattern layer includes colored particles for controlling a color coordinate deviation of light emitted from the light-incident portion and light emitted from the light-facing portion.

In the light guide plate according to the embodiment of the present invention, the color coordinate deviation of the light emitted from the light-incoming portion and the light emitted from the light-facing portion satisfies the following relational expression (1).

[Relation 1]

0 < / = x &lt; 0.005

(In the above relational expression 1, DELTA x is an x-coordinate deviation in the color coordinates of light measured in the light-incident portion and the light-out portion, respectively.)

In the light guide plate according to the embodiment of the present invention, the color coordinate deviation of light emitted from the light-incoming portion and light emitted from the light-facing portion satisfies the following relational expression (2).

[Relation 2]

0 ≤ │Δ y <0.008

(In the above-mentioned relational expression 2, DELTA y is the y coordinate deviation of the color coordinates of light measured in the light-incoming portion and the light-out portion, respectively.)

In the light guide plate according to an embodiment of the present invention, the pattern layer is formed by curing a UV curable resin, and the content of the colored particles contained in the pattern layer is 0.025 ppm to 0.071 ppm.

In the light guide plate according to an embodiment of the present invention, the pattern layer includes a colored particle layer formed on the opposite side of the light exit surface, and a resin layer formed of UV curable resin on the colored particle layer.

In the light guide plate according to an embodiment of the present invention, the colored particle layer is formed by ejecting the colored particles on the opposite surface of the light emitting surface.

In the light guide plate according to an embodiment of the present invention, the colored particles may be blue pigments.

According to an aspect of the present invention, there is provided a face light device comprising: a light source; A light emitter plate including a light incident portion on which the light emitted from the light source is incident, a light outgoing portion facing the light incoming portion, and a light outgoing surface connecting the upper side of the light incoming portion and the upper side of the corresponding light portion, The pattern layer includes colored particles for controlling the color coordinate deviation of light emitted from the light-incident portion and light emitted from the light-facing portion.

According to the present invention, the color coordinate deviation of the light emitted from the light guide plate can be adjusted.

1 is a perspective view of a surface emitting device according to an embodiment of the present invention,
Fig. 2 is a sectional view of Fig. 1 taken along the line AA,
3 is a cross-sectional view showing another embodiment of the present invention,
4 is a graph showing a color coordinate deviation and a luminance according to the content of colored particles.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It is to be understood that the drawings are to be construed as illustrative and not restrictive.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 1 is a perspective view of a surface light emitting device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG.

The face light device according to the present invention includes a light source 100, a light incident portion 200A through which the light emitted from the light source 100 is incident, a light focusing portion 200B facing the light entrance portion 200A, And a reflection plate 300 disposed under the light guide plate 200. The light guide plate 200 has a light guide plate 200,

The light source 100 may be selected from a variety of light emitting devices capable of emitting white light such as an LED, an OLED, or a CCFL. The light source 100 is disposed on one side or both sides of the light guide plate 200 and emits light toward the light guide plate 200. In the present invention, a structure in which the light source 100 is disposed on one side of the light guide plate 200 will be described.

The light guide plate 200 includes a light incident portion 200A on which light is incident and a light focusing portion 200B facing the light entrance portion 200A. The light incident portion 200A can be defined as a region including the incident surface 201 on which the light is incident on the light guide plate 200 and a 1/3 region close to the light source 100 when the light guide plate 200 is divided into three, The light-shielding portion 200B is defined as a region that is the farthest one-third of the light source 100 when the light guide plate 200 is divided into three regions including the light-shielding surface facing the incident surface 201.

The light guide plate 200 also has a light exit surface 211 extending from the upper surface 211a of the light entrance portion 200A to the upper surface 211b of the light blocking portion 200B. Accordingly, the incident light travels from the light-incident portion 200A toward the light-facing portion 200B, and a part of the incident light is emitted to the outside through the light exit surface 211 to be converted into a surface light source.

The light guide plate 200 includes a light emitter plate 210 having a predetermined thickness and a pattern layer 220 formed on a lower portion of the light emitter plate 210 opposite to the light exit surface. Specifically, the light emitter plate 210 may be made of a polycarbonate resin (PC) or a poly methyl methacrylate (PMMA) having a predetermined thickness.

The pattern layer 220 may be formed on the lower surface of the light emitter plate 210 using a curable resin. As the curable resin, UV curable resin or thermosetting resin may be used. The pattern layer 220 may be formed using a stamp having a predetermined pattern. That is, the curable resin may be applied on the lower surface of the light emitter plate, then pressed with a stamp having a predetermined pattern, and the resin may be cured using UV or heat.

The light incident on the light guide plate 200 in the light source 100 travels toward the light-focusing portion 200B of the light guide plate 200. [ At this time, a part of the light may be incident on the pattern layer 220 in the light emitter plate 210, and part of the light may be incident on the light emitter plate 210 in the pattern layer 220. Some of the light incident on the pattern layer 220 may be refracted by the pattern 220a formed on the lower surface and be emitted to the light exit surface 211 of the light guide plate 200. [ The pattern formed on the pattern layer 220 may be a general prism shape, a lens shape, or the like.

In general, the light emitted from the light source 100 may be white light, and the white light may be a mixture of a blue wavelength, a green wavelength, and a red wavelength. Some of the light incident on the light source 100 may be emitted to the outside through the light exit surface 211a of the light entrance portion after being incident on the light guide plate 200 and some light L3 may be totally reflected And may be emitted to the outside through the light exit surface 211b on the side of the large light portion. In addition, some of the light L2 may be refracted while being emitted toward the light-focusing portion 200B.

At this time, the light L1 emitted to the outside from the light exit surface 211a on the side of the light-entrance portion has almost the same color coordinate as the color coordinate of the light emitted from the light source 100, but on the light exit surface 211b on the light- The light L2 emitted from the light source 100 has a color coordinate different from that of the light emitted from the light source 100. [

Specifically, the light L3 emitted from the light-facing portion 200B changes in color coordinate values and becomes yellow when observed with the naked eye. Such a yellowish phenomenon causes a deterioration in display quality . This is because the blue light component of a relatively short wavelength is scattered or absorbed while the incident white light advances to the light-focusing part 200B of the light guide plate 200. [

In the present invention, however, since the colored particles P are dispersed in the pattern layer 220, the color coordinate of the light L3 traveling to the light-focusing portion 200B is divided into the color coordinates of the light L1 emitted from the light- Can be similarly adjusted. That is, even though scattering or absorption of the blue wavelength component increases as the incident light progresses toward the side of the large light portion 200B, since the probability of contact with the colored particles P increases in proportion thereto, the light of short wavelengths lost is supplemented to control the color coordinate deviation You can.

As the colored particles P, a blue color pigment generally used for a color filter may be selected. However, the present invention is not limited thereto, and various dyes capable of restoring white light whose intensity of a blue wavelength is weak can be restored to its original state a dye may be selected.

Specifically, the color coordinate deviations (DELTA x, DELTA y) of the light emitted from the light-incident portion 200A and the light emitted from the light-facing portion 200B are preferably adjusted to satisfy the following relational expressions 1 and 2. [ The x-coordinate deviation DELTA x in the color coordinates of the light is a deviation of the CIE system x-coordinate measured in the partial area of the light entrance portion 200A and the light portion 200B respectively and the y coordinate deviation DELTA y is reflected by the light entrance portion 200A. And the CIE system y coordinate measured in a part of the light-shielding portion 200B.

[Relation 1]

0 < / = x &lt; 0.005

[Relation 2]

0 ≤ │Δ y <0.008

In the relational expression 1, │Δx│ is the absolute value of the x-coordinate deviation among the color coordinates of the light measured on the light exit surface of the light-entering section 200A and the light-exiting section 200B, respectively, and │Δy│ Is the absolute value of the y coordinate deviation among the color coordinates of the light measured on the light exit surface of the light blocking portion 200A and the light blocking portion 200B.

If the deviation of the x coordinate in the color coordinate of the light emitted from the light-incident portion 200A and the light coordinate of the light emitted from the light-blocking portion 200B exceeds 0.005 or the deviation of the y coordinate in the color coordinate of the light exceeds 0.008, There is a problem that the color of the image realized in the liquid crystal display panel is poor. Further, in the case of a lighting apparatus, a yellowing phenomenon is observed with the naked eye and a defect is generated.

At this time, the pattern layer 220 can be formed by curing the UV curable resin in which the colored particles are dispersed, but the present invention is not limited thereto, and the pattern layer 220 may be formed as a separate layer as shown in FIG.

That is, the coloring particle layer 221 may be formed first on the lower surface of the light emitter plate 210, and then the resin layer 222 may be formed by coating the UV curable resin on the cured resin layer 222. At this time, the colored particle layer 221 may be formed by spraying the colored particles P by a spraying method, or may be sprayed after the colored particles P are dispersed in a solvent.

In the case of forming the separate colored particle layer 221, it is not necessary to disperse the colored particles P in the UV-curable resin when forming the resin layer 222, which simplifies the manufacturing process. In addition, when the adhesive composition is used as a solvent for the colored particles (P), the adhesion of the colored particles (P) can be facilitated while the adhesive strength with the resin layer (222) can also be increased.

FIG. 4 is a graph showing the color coordinate deviation and luminance according to the content of the colored particles (P), and Table 1 below is a table for measuring the deviation and the luminance of the color coordinates according to the content of the colored particles.

At this time, the content of the colored particles (P) means the content of the colored particles (P) contained in the cured pattern layer, which means a weight of 1000000000000000000000 parts by weight. For example, a content of colored particles of 0.02 ppm means that 0.010 g of colored particles are contained in 1 x 10 ⁶ g of the patterned layer in a cured state.

Colored particles (ppm) Color coordinates (| x x |) The color coordinates (|? Y |) Brightness (nit) Experimental Example 1 0.000 0.0088 0.0115 4400 Experimental Example 2 0.02 0.0063 0.0112 4020 Experimental Example 3 0.03 0.0024 0.0064 4180 Experimental Example 4 0.04 -0.0007 0.0046 4050 Experimental Example 5 0.06 -0.0010 0.0049 3690 Experimental Example 6 0.1 -0.0148 -0.0102 3500

Referring to Table 1, in the case where the colored particles are not included as in Experimental Example 1, or the colored particles are contained excessively as in Experimental Example 6, the absolute value of the deviation (x) of x coordinate in the light color coordinates Is greater than 0.005. However, in Experimental Examples 3, 4 and 5, it can be confirmed that the color coordinate deviations are reduced by the colored particles.

4, in order to maintain the absolute value of the x-coordinate deviation (Δx) within the color coordinates of the light within 0.005, the content of the colored particles (P) in the pattern layer is 0.023 ppm to 0.071 ppm .

Referring again to Table 1, in the case where the colored particles are not included as in Experimental Example 1, or when the colored particles are contained excessively as in Experimental Example 6, the absolute value of the y coordinate deviation (y) Value is greater than 0.008. However, in Experimental Examples 3, 4 and 5, it can be confirmed that the color coordinate deviations are reduced by the colored particles.

4, in order to maintain the absolute value of the y coordinate deviation (y) in the color coordinates of the light within 0.008, the content of the colored particles (P) contained in the pattern layer is 0.025 ppm to 0.097 ppm Section).

Therefore, in order for the deviation (x) of the x coordinate of the light and the deviation (y) of the y coordinate of the color coordinate of the light to be simultaneously satisfied, the content of the colored particles (P) contained in the pattern layer is preferably 0.025 ppm to 0.071 ppm b to c section).

As described above, the present invention has been described in detail by way of preferred embodiments, but the present invention is not limited to the contents of these embodiments. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the appended claims, You should see.

100: light source 200: light guide plate
200A: light-incident portion 200B:
210: light emitter plate 211: light emitting surface
220: pattern layer 220a: pattern

Claims (12)

A light emitter plate including a light incident portion on which light emitted from the light source is incident, a light emitting portion facing the light incident portion, and a light output surface connecting the upper side of the light entering portion and the upper side of the light shielding portion; And
And a pattern layer formed on an opposite surface of the light emitting surface,
Wherein the pattern layer includes a colored particle layer formed on the opposite surface of the light emitting surface and a resin layer formed of UV curable resin on the colored particle layer. The light guide plate according to claim 1, wherein a color coordinate deviation of light emitted from the light-incoming section and light emitted from the light-focusing section satisfies the following relational expression (1).
[Relation 1]
0 ≤ │Δx│ <0.005
(In the above relational expression 1, DELTA x is an x-coordinate deviation in the color coordinates of light measured in the light-incident portion and the light-out portion, respectively.) 3. The light guide plate according to claim 2, wherein a color coordinate deviation of light emitted from the light-incoming section and light emitted from the light-focusing section satisfies the following relational expression (2).
[Relation 2]
0? |? Y | <0.008
(In the above-mentioned relational expression 2, DELTA y is the y coordinate deviation of the color coordinates of light measured in the light-incoming portion and the light-out portion, respectively.) delete delete The light guide plate according to claim 1, wherein the colored particle layer is formed by ejecting the colored particles on a surface opposite to the light emission surface. The light guide plate according to claim 1, wherein the colored particles are blue pigments. Light source; And
A light emitter plate including a light entrance portion into which light emitted from the light source is incident, a light exit portion facing the light entrance portion, and a light exit surface connecting an upper side of the light entrance portion and an upper side of the light reception portion; And a light guide plate including a patterned layer formed thereon,
Wherein the pattern layer includes a colored particle layer formed on a surface opposite to the light emitting surface, and a resin layer formed of UV curable resin on the colored particle layer. The surface emitting device according to claim 8, wherein a color coordinate deviation of light emitted from the light-incoming portion and light emitted from the light-facing portion satisfies the following relational expression (1).
[Relation 1]
0 ≤ │Δx│ <0.005
(In the above relational expression 1, DELTA x is an x-coordinate deviation in the color coordinates of light measured in the light-incident portion and the light-out portion, respectively.) The surface emitting device according to claim 9, wherein a color coordinate deviation of light emitted from the light-incoming portion and light emitted from the light-facing portion satisfies the following relational expression (2).
[Relation 2]
0? |? Y | <0.008
(In the above relational expression 1, DELTA y is the y coordinate deviation of the color coordinates of the light measured in the light-incident portion and the light-out portion, respectively.) A light emitter plate including a light incident portion on which light emitted from the light source is incident, a light emitting portion facing the light incident portion, and a light output surface connecting the upper side of the light entering portion and the upper side of the light shielding portion; And
And a pattern layer formed on an opposite surface of the light emitting surface,
Wherein the pattern layer is formed of a UV curable resin, and the content of the colored particles contained in the pattern layer is 0.025 ppm to 0.071 ppm. Light source; And
A light emitter plate including a light entrance portion into which light emitted from the light source is incident, a light exit portion facing the light entrance portion, and a light exit surface connecting an upper side of the light entrance portion and an upper side of the light reception portion; And a light guide plate including a patterned layer formed thereon,
Wherein the pattern layer is formed of a UV curable resin, and the content of colored particles contained in the pattern layer is 0.025 ppm to 0.071 ppm.

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