KR101653749B1 - Structure of light guide plate for prevention of light leakage - Google Patents

Structure of light guide plate for prevention of light leakage Download PDF

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Publication number
KR101653749B1
KR101653749B1 KR1020160023199A KR20160023199A KR101653749B1 KR 101653749 B1 KR101653749 B1 KR 101653749B1 KR 1020160023199 A KR1020160023199 A KR 1020160023199A KR 20160023199 A KR20160023199 A KR 20160023199A KR 101653749 B1 KR101653749 B1 KR 101653749B1
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KR
South Korea
Prior art keywords
light
guide plate
light guide
guide
light source
Prior art date
Application number
KR1020160023199A
Other languages
Korean (ko)
Inventor
이미라
박종화
Original Assignee
이미라
박종화
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Publication date
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Priority to KR1020160023199A priority Critical patent/KR101653749B1/en
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Publication of KR101653749B1 publication Critical patent/KR101653749B1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a light guide plate structure for a backlight. The light guide plate includes a light guide plate body having a uniform thickness and a wedge-shaped light receiving unit formed at a light source of the body. Specifically, the light receiving unit includes a plurality of hollow cave shaped light guides for providing an optic axis direction orientation of light supplied from a light source, wherein the hollow cave shaped light guides are elongated from an incident surface having a vertical plane shape toward a rear inclined surface along the optic axis, are arranged in parallel to each other, and have inner ends which are enclosed to be inclined. In addition, the body is embedded in a valley portion at a height lower than that of a pattern and includes a filler material between the body and a side surface of each pattern to form a contact boundary surface. According to the light guide plate structure of the present invention, light leakage and loss may be reduced and the brightness property of a light guide plate may be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate for preventing light leakage,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate, and more specifically, to a structure of a light guide plate applied to a surface light source device for backlighting such as a liquid crystal display.

Background Art [0002] In recent years, in accordance with a demand for thinning of mobile devices, a surface light source device applied to a device is also required to be gradually thinned. On the other hand, even if the thickness of the planar light guide plate can be reduced for thinning the surface light source device, there is a limit in reducing the height of the light source made of the LED. Therefore, in the case of using a thin flat light guide plate, the height of the light source becomes larger than the thickness of the incident surface of the light guide plate, so that the light source arranged opposite to the incident surface of the light guide plate becomes higher than the upper surface of the light guide plate.

When the light source is higher than the light guide plate, all of the light supplied from the light source does not enter the incident surface of the light guide plate, and a part of the light leaks to the outside. In order to solve such a problem, a wedge-shaped light receiving portion called "edge" having a larger thickness than the main body of the light guide plate is provided on one side of the planar light guide plate main body to enlarge the incident surface, As shown in Fig.

FIG. 1 illustrates a planar light source device using the light guide plate having such a structure. Referring to FIG. 1, the surface light source device 1 uses a light guide plate 2 having a light receiving portion 4 having a larger thickness than the light guide plate main body 3. Here, the light guide plate 2 is composed of a planar light guide plate main body 3 having a uniform thickness and a wedge-shaped light receiving portion 4 formed on one side of the main body 3. A reflection pattern is formed on the back surface of the light guide plate main body 3, and a lenticular lens 6 is formed on the surface. The light receiving portion 4 includes an incident surface on the front surface and an inclined surface 5 formed toward the upper surface of the light guide plate main body 3 at the upper end of the incident surface.

On the other hand, the thickness of the front surface of the light receiving portion 4 is equal to or larger than the height of the light source L. The light supplied from the light source L can be efficiently transmitted to the light receiving section 4 by making the cross-sectional thickness of the light receiving section 4 larger than the height of the light source L in the surface light source device 1. The light transmitted to the light receiving portion 4 is guided to the light guide plate main body 3, spreads over the entire surface, is reflected by the reflection pattern, and is output to the outside through the surface emitting surface of the light guide plate main body 3. At this time, the light output from the exit surface has a large directivity characteristic in the lenticular lens 6.

According to the surface light source device having such a structure, it is possible to improve the light utilization efficiency and reduce the thickness of the surface light source device. However, according to this structure, the light advancing in the direction inclined with respect to the optical axis of the light source L in the light receiving portion 4 becomes wider in the lateral direction as it is expanded and reflected on the inclined surface 5, . As a result, light emitted from the inclined plane 5 leaks to the side surface of the light guide plate 2 (see arrow a), while light is incident in the lateral direction of the lenticular lens 6 and light leaks from the lenticular lens 6 (Refer to (b)), problems such as a decrease in light utilization efficiency due to loss of light amount and a decrease in luminance uniformity are caused.

Thus, there has been an attempt to prevent light leakage by forming a plurality of directivity patterns 7 on the surface of the inclined surface 5 of the light receiving portion 4. [ However, the light reflected by the pattern 7 is more likely to diffuse in the left and right directions than in the case of only the inclined surface 5, and thus the spread of light becomes greater, This makes it easier to leak (see arrow ⓒ). In the case where the light guide plate main body 3 has an optical pattern such as the lenticular lens 6, the light easily leaks in the longitudinal direction between the patterns (refer to arrow d). As a result, problems such as a decrease in light utilization efficiency and a decrease in luminance uniformity due to a loss of light amount still or more seriously occur.

On the other hand, referring to FIG. 2, there has been an attempt to form a light diffusion pattern on the incident surface of the light receiving section 4 to broaden the light in the lateral direction. In other words, it is possible to prevent the side edge portion of the light guide plate 2 from becoming relatively dark by diffusing the light incident thereon using the light diffusion pattern 8 widely in the left and right and lateral directions.

But in this case:

The light supplied from the light source L is reflected and dispersed to the left and right in front of the incident surface. In this process, a considerable amount of light loss occurs.

By forcibly diffusing a certain amount of light from before entering the light receiving portion 4, the overall brightness and brightness of the light guide plate 2 are seriously deteriorated;

And it is difficult to actually apply it. Thus, in reality, when the incident surface is long in the left and right directions:

A method of disposing a plurality of light sources L apart from each other;

.

<Prior Art Literature>

Published Patent No. 10-2010-0041911

Published patent application No. 10-2011-0083490

Published patent application No. 10-2011-0101050

Published Japanese Patent Application No. 10-2013-0105371

The present invention has been proposed to solve the problems of the above-mentioned prior arts. It is an object of the present invention to provide a light guide plate structure for a backlight unit which is applicable to a surface light source device for backlighting and which can improve the overall structure to prevent light leakage and luminance uniformity deterioration.

Therefore, the present inventors have found that:

First, when the light supplied from the light source enters the incident surface of the light receiving portion in the beginning, the light guide plate is designed to have the directivity in the direction of the optical axis,

Second, the outgoing optical pattern is structurally and morphologically improved;

The present invention has been accomplished in view of the fact that the object of the present invention can be achieved to the maximum.

The light guide structure of the present invention comprises:

And a wedge-shaped light receiving section formed on the light source side of the main body so as to have a greater thickness than the main body, the main body including a plurality of convex lenticular optical patterns formed in parallel to the optical axis direction on the emission surface side And the light receiving unit is based on a conventional light guide plate structure including a light incident surface on the front surface and a rear surface inclined toward the upper surface of the main body at an upper end of the incident surface;
The light receiving unit may include a plurality of light emitting units arranged parallel to each other in the direction of the optical axis from the incident plane to the back slope in order to provide the optical axis directionality of the light supplied from the light source, A hollow cave type light guide hole;

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The body including a filling material embedded in the valley of the light pattern lower than the height of the light pattern and forming a contact interface between the filling material and a side surface of the respective light pattern;
The guide hole is formed to be smaller in size than the light source and is inclined to the inclined surface in a state in which the end is located in a portion corresponding to the inclined surface in a state in which the light source is disposed apart from the light incident surface of the light receiving portion that;

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.

Preferably, the guide hole comprises:

Arranged in two or more columns in the upper and lower rows;

At this time, the guide holes of the respective columns are arranged alternately,

More preferably, the guide holes of the lower row are formed to be longer than the guide holes of the upper row corresponding to the inclined surfaces.

On the other hand, the light-

A hollow guide tube mounted inside the guide hole and having its outer surface closely supported on an inner wall of the guide hole;

.

The guide tube may be an optical tube manifold in which a plurality of guide tubes are integrally formed and correspond to a plurality of guide holes.

The filler is a UV resin, and preferably the surface is formed in a concave shape.

According to the light guide plate structure of the present invention, 1) the light supplied from the light source is guided in the direction of the optical axis through the guide hole or the tube formed in parallel to the optical axis direction so that diffusion and spreading of light are suppressed in left and right directions, 2) At the same time, light leakage and loss in the lateral and longitudinal directions of the pattern are prevented by the light-leakage preventing filler disposed between the light-emitting-side light patterns. As a result, the light efficiency is increased over the entire light exit surface, and the luminance uniformity of the entire light guide plate is prevented from being lowered.

1 is a perspective view showing a conventional light guide plate structure.
Fig. 2 is a view showing an example of the shape of the light receiving portion of Fig. 1;
3 is a perspective view illustrating a structure of a light guide plate according to an embodiment of the present invention.
Fig. 4 is an enlarged cross-sectional view of the light receiving portion of Fig. 3; Fig.
5 is a cross-sectional enlarged view of the main body portion of Fig. 3;
Fig. 6 is a plan view of Fig. 3; Fig.
FIG. 7 is a perspective view illustrating a structure of a light guide plate according to another embodiment of the present invention. FIG.
8 is an enlarged partial sectional view of Fig.
Figure 9 is a cross-sectional view of the tube applied to Figure 7;

The features and effects of the present invention "backlight structure for backlight" (hereinafter referred to as "light guide structure") described or not described above will become more apparent from the following description of each embodiment with reference to the accompanying drawings. 3, the light guide plate structure of the present invention is indicated by reference numeral 10.

3, a light guide plate structure 10 according to the present invention includes a planar light guide plate main body 11 having a uniform thickness and a light guide plate 11 having a main body 11, Shaped light receiving portion 12 formed to have a thickness larger than that of the wedge-shaped light receiving portion 11. The light receiving unit 12 includes a front light incidence surface 13 and a rear inclined surface 14 formed at an upper end of the incident surface 13 and inclined toward the upper surface of the light guide plate main body 11.

Naturally, the upper surface of the main body 11 is formed by the light emitted from the light source L and entering and diffusing into the main body 11 through the incident surface 13 of the light receiving portion 12, 15). At this time, a light pattern 16 is formed on the exit surface 15 in order to improve brightness and directivity of output light. More specifically, the light pattern 16 is a plurality of convex lenticular patterns extending in the direction of the optical axis X and arranged in parallel.

However, the shape of the main body 11, the light receiving portion 12, the light pattern 16, and the like in the light guide plate structure 10 of the present invention is a technique that is commonly applied to a general light guide plate structure, and is not unique to the present invention. According to the design, the light guide plate structure 10 is a conventional multi-layer structure method for molding the light receiving portion 12 and the optical pattern 16 using a UV resin on an engineering plastic material base film such as PC, PMMA, . In addition, a directional reflection pattern may be formed on the lower surface of the film, and a roll-stamping method such as a pressure forming method is generally applied for the pattern. However, the present invention is not limited to such molding and molding methods, and various other methods may be applied without limitation.

The light receiving portion 12 of the present invention is characterized in that the light receiving portion 12 of the present invention is arranged such that the light incident from the light incident surface 13 toward the rear slanted surface 14 is perpendicular to the optical axis X of the light source L, And a hollow cave-shaped light guide hole 17 formed in parallel and arranged in parallel with the inner edge 18 in the X direction.

3 and 4, more specifically, the guide holes 17 are arranged in a horizontal line over the upper and lower two rows 17a and 17b, and the intervals between the rows 17a and 17b are made close to each other The guide holes 17 of each row are preferably arranged so as to alternate with each other as shown. In order to sufficiently utilize the width of the light receiving portion 12 in forming the guide hole 17, the guide hole 17 of the lower row 17b is formed in the guide hole 17a of the upper row 17a, (17).

6, the guide hole 17 is formed to have a smaller cross-sectional size than the light source in a state where the light source is spaced apart from the light incident surface 13 of the light receiving unit 12, ) Is inclined to a structure parallel to the inclined surface (14) in a state where it is positioned at a portion corresponding to the inclined surface (14).

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Referring to FIG. 5, the main body 11 includes a filler 16 for preventing leakage of light formed by being embedded in the valley of the light pattern 16. More specifically, the filler material 23 is embedded with a transparent UV resin below the height of the light pattern 16, and the filler material forms a contact interface 24 between the sides of each pattern 16. Wherein the interface (24) prevents light from diffusing laterally of the pattern (16). However, if the height of the filler 23 is equal to or greater than the height of the light pattern 16, directivity and luminance characteristics of the light output may be affected.

Therefore, the filler material 23 is buried lower than the height of the pattern 16, and preferably the surface of the filler material 23 is formed in a concave shape, It is possible to effectively prevent light leakage or diffusion in the lateral direction.

6, in the light guide plate structure 10 described above, the light supplied from the light source L to the incident surface 13 is guided by the guide hole 17 and travels in the direction of the optical axis X. At this time, a considerable amount of light rapidly advances into the hollow guide hole 17 (see arrows 1 and 2 in FIG. 5), and light entering the adjacent plane is also guided between the plurality of guide holes 17, (See arrow 3 in Fig. 5).

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Preferably, the guide hole 17 has its end 18 inclined in a direction corresponding to the inclined surface 14. This type of tip 18 is effective for allowing light from the light source L to enter the interior of the main body 11 naturally and quickly as in the case of the inclined surface 14 of the light receiving portion 12. [ Also, at this time, the light is not leaked in the longitudinal direction and the lateral direction of the light pattern 16 by the filler 23. Therefore, light leakage in the left and right direction and the longitudinal direction as a whole can be prevented.

The diameter of the light guide hole 17 described above may not be constant in the longitudinal direction depending on the physical properties of the material of the light receiving portion 12, or clogging may occur in a certain region. In this case, in fact, refraction of incident light and advancing light becomes severe, and it becomes impossible to obtain a desired degree of directivity in the optical axis (X) direction. Therefore, measures for maintaining and supporting the shape of the guide hole 17 are required.

7 and 8, the light receiving unit 12 includes a hollow hollow light guide tube 19 mounted inside the guide hole 17 and having its outer surface closely contacted with the inner wall of the guide hole 17 . The tube 19 supports the shape of the guide hole 17 so as to prevent the light from being changed due to the change in the shape of the hole 17. In addition, the interface 20 between the guide hole 17 and the light receiving portion 12 is provided so that, for example, the light entering the plane of the incident surface 13 functions to improve the directivity in the direction of arrow ③ in FIG.

Here, the guide tube 19 has a closed end 21, and preferably, the closed end 21 of the tube 19 is inclined in a direction corresponding to the inclined surface 14. This is effective for allowing the light of the light source L to enter the interior of the main body 11 naturally and quickly, similarly to the guide hole 17.

Referring to FIG. 9, the guide tube 19 may be an optical tube manifold 22 formed integrally with a plurality of guide holes 17. This type of manifold 22 provides the benefit of assembling and disassembling a plurality of guide tubes 19 at once.

10. Light guide structure
11. Body
12. Photoreceptor
13. Incident surface
14. Slope
15. Outgoing surface
16. Light pattern
17. Guide hole
17a. Flush
17b. Lower
18. End
19. Guide tube
20. Interface
21. End
22. Manifold
23. Fillers
24. Interface
L. Light source
X. Optical axis

Claims (8)

And a wedge-shaped light receiving portion 12 formed on the side of the light source L of the main body at a thickness greater than that of the main body 11. The main body 11 is formed on the light exit surface 15 side And a plurality of convex lenticular optical patterns (16) formed in parallel to the optical axis (X) direction, wherein the light receiving portion has a light incidence surface (13) on the front surface and a rear surface In the light guide plate structure including the inclined surface 14,
The light receiving unit 12 is arranged to extend in the direction of the optical axis X from the incident plane 13 of the vertically planar shape toward the inclined plane 14 in order to provide the optical axis X directionality of the light supplied from the light source L. And a hollow cave-shaped light guide hole (17) in which each inner end (18) is closed;
The body 11 is embedded in the valley of the light pattern 16 below the height of the light pattern 16 and has a contact interface 24 between the fill material and the sides of the respective light pattern 16, And a filler (23) for forming the filler (23);
The guide hole 17 is formed to have a smaller sectional size than the light source and the end 18 corresponds to the inclined surface 14 in a state in which the light source is disposed apart from the light incident surface 13 of the light- A sloped surface having a structure parallel to the inclined surface 14;
And a light guide plate structure for preventing light leakage.
The method according to claim 1,
The light guide plate according to claim 1, wherein the guide holes (17) are arranged in two rows or more in the longitudinal direction and the guide holes (17) in the columns (17a, 17b) .
3. The method of claim 2,
Wherein a guide hole (17) of the lower row (17b) is formed to be longer than a guide hole (17) of the heat ray (17a).
delete The method according to claim 1,
The light receiving unit 12 includes:
A hollow guide tube 19 mounted inside the guide hole 17 and having an outer surface closely supported on an inner wall of the guide hole 17;
And a light guide plate for preventing light leakage.
6. The method of claim 5,
Wherein the guide tube (19) is an optical tube manifold (22) formed integrally with a plurality of guide holes (17) so as to correspond to a plurality of guide holes (17).
The method according to claim 5 or 6,
Wherein the guide tube (19) has a closed end (21) sloped in a direction corresponding to the inclined surface (14).
The method according to claim 1,
Wherein the filler (23) is a UV resin and the surface is formed in a concave shape.
KR1020160023199A 2016-02-26 2016-02-26 Structure of light guide plate for prevention of light leakage KR101653749B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002208307A (en) * 2000-07-31 2002-07-26 Matsushita Electric Ind Co Ltd Manufacturing method of illumination device, image display device, liquid crystal monitor, liquid crystal tv, liquid crystal information terminal and light guide plate
JP2008003232A (en) * 2006-06-21 2008-01-10 Fujifilm Corp Optical sheet and method for producing optical sheet, backlight and liquid crystal display
JP2014130748A (en) * 2012-12-28 2014-07-10 Omron Corp Light guide plate and surface light source device
JP2014153586A (en) * 2013-02-12 2014-08-25 Japan Display Inc Liquid crystal display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002208307A (en) * 2000-07-31 2002-07-26 Matsushita Electric Ind Co Ltd Manufacturing method of illumination device, image display device, liquid crystal monitor, liquid crystal tv, liquid crystal information terminal and light guide plate
JP2008003232A (en) * 2006-06-21 2008-01-10 Fujifilm Corp Optical sheet and method for producing optical sheet, backlight and liquid crystal display
JP2014130748A (en) * 2012-12-28 2014-07-10 Omron Corp Light guide plate and surface light source device
JP2014153586A (en) * 2013-02-12 2014-08-25 Japan Display Inc Liquid crystal display device

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