KR20170084882A - Crystal backlight unit - Google Patents

Crystal backlight unit Download PDF

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Publication number
KR20170084882A
KR20170084882A KR1020160004273A KR20160004273A KR20170084882A KR 20170084882 A KR20170084882 A KR 20170084882A KR 1020160004273 A KR1020160004273 A KR 1020160004273A KR 20160004273 A KR20160004273 A KR 20160004273A KR 20170084882 A KR20170084882 A KR 20170084882A
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KR
South Korea
Prior art keywords
guide plate
light guide
light
prism
backlight unit
Prior art date
Application number
KR1020160004273A
Other languages
Korean (ko)
Inventor
강병수
Original Assignee
주식회사 파인텍
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 파인텍 filed Critical 주식회사 파인텍
Priority to KR1020160004273A priority Critical patent/KR20170084882A/en
Publication of KR20170084882A publication Critical patent/KR20170084882A/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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G02F2001/133607—

Abstract

A transparent backlight unit having a prism light guide plate is disclosed. In the transparent backlight unit having the edge type prism light guide plate to which the at least one LED light source of the present invention is applied, the asymmetric prism pattern is arranged on one side of the longitudinal direction of the light guide plate on which the light of the LED light source is incident, The reflective sheet is removed by applying a highly efficient light guide plate oriented at a certain angle, and the transparent display can be implemented. Thus, the present invention can be applied to various product groups, There is an effect of reducing the material cost.

Description

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

The present invention relates to a transparent backlight unit, more particularly, to a prism pattern formed on one side surface of a light guide plate so that light incident from an LED is vertically emitted, and an image of an object behind the light guide plate is clearly projected To a transparent backlight unit having a prism light guide plate.

In general, a display device has a large display area, is light in weight to increase mobility, and requires a small size in order to increase portability.

The LCD display device has a tendency to replace all CRT display devices because of its excellent image quality, light weight, thinness, and low power consumption. Especially, the LCD display device is adopted in devices requiring mobility and portability such as notebook computers and mobile phones.

However, since the LCD display device is non-luminous, it can not display visual information itself, and an external light source must be separately provided. A backlight unit device has been developed which supplies a planar light source of uniform luminance according to such necessity.

The backlight unit includes a light source, a light guide plate, and a reflector, and is divided into an edge type and a direct type by a method of arranging a light source.

Since the edge type backlight unit device has a light source disposed on a side surface of the light guide plate, it has a relatively thin structure and is mainly used in devices requiring small size, light weight and thinness such as portable equipment.

The direct-type backlight device has a relatively thick thickness because the light source is disposed on the bottom surface of the light guide plate. However, since the light efficiency is excellent, the quality of the displayed information is enhanced. Therefore, it is mainly used in a device requiring a large screen such as a TV monitor.

Hereinafter, a light guide plate using an edge type backlight unit will be mainly described.

The light guide plate according to the related art is incident on the light of a point light source or a linear light source incident from a light source disposed on a side surface and scattered in the interior thereof to have a relatively small area area to be converted and emitted into a planar light source.

Particularly, since the brightness is uneven in the state of being converted into the surface light source, the difference in brightness occurs partially, and since the effective area is small, it is difficult to increase the width of the effective screen for displaying information, .

In order to increase the effective area of the planar light source, the light scattering should be performed well inside the main body, and in order that the scattering can be performed well, the total reflection and diffuse reflection It should be smoothly performed, and the luminance should not be unnecessarily attenuated in the light emission path.

In the prior art, polymethyl methacrylate acrylic resin (PMMA: Poly-Methyl Methacrylate) was used as a material of the light guide plate body, and a groove formed by V-shaped cutting was formed on the lower surface of the body so as to scatter light, A diffusion plate, a horizontal and a vertical prism plate, and the like were attached to the upper surface of the light guide plate main body in order to uniformly emit light to the planar light source.

However, in the conventional technique, there is a problem that the time and cost for V-shaped cutting are large and the occurrence of defects increases.

On the other hand, a manufacturing process for attaching a diffuser plate, a prism plate, and the like to the upper surface of the light guide plate main body is complicated, and the production time is prolonged, and the cost increases.

Further, there is a problem that it is difficult to widen the area of the planar light source that is attenuated and diffused in a continuous manner at the interface separating the materials such as the main body of the light guide plate, the diffuser plate, the prism plate, and the like.

Therefore, it is necessary to develop a technique for simplifying the manufacturing process of the edge type light guide plate, reducing the production time, and improving the quality of the displayed information without the difference in contrast.

Particularly, it is necessary to develop a technique for simplifying the entire configuration of the edge type light guide plate and preventing unnecessary attenuation of the brightness of the surface light source in the process of emitting light.

Meanwhile, in recent years, studies have been made actively on a transparent liquid crystal display device in which a user can view an object or an image located on the opposite side through a liquid crystal display device.

Such a transparent liquid crystal display device has advantages of space utilization, interior and design, and can have various application fields.

In particular, in a transparent liquid crystal display device, a transparent liquid crystal display device capable of clearly distinguishing objects or images located on the opposite side and capable of realizing an image realized from a liquid crystal display device more clearly is desired.

KR Patent Publication No. 10-2015-0126199 (Nov.

In order to solve such problems, it is an object of the present invention to provide a transparent backlight unit including a prism light guide plate capable of removing a reflective sheet by applying a high efficiency light guide plate and realizing a transparent display.

Another object of the present invention is to provide a transparent backlight unit having a prism light guide plate capable of reducing a material cost in various product groups compared to a conventional transparent display.

It is another object of the present invention to provide a transparent backlight unit having a prism light guide plate for forming a pattern having a specific angle on one side of a light guide plate, which is a vertical direction in which a light source of an LED package is incident, The purpose.

It is another object of the present invention to provide a transparent backlight unit device having a prism light guide plate having a prism pattern formed asymmetrically on a light guide plate.

In order to solve such a problem, a transparent backlight unit having an edge type prism light guide plate to which one or more LED light sources according to an embodiment of the present invention is applied includes an edge type backlight unit to which at least one LED light source is applied, The asymmetric prism pattern may be arranged on one side of the longitudinal direction of the light guide plate in a shape selected from an engraved angle and an embossed angle so that the light of the inserted light source is emitted to the other side.

Also, the light guide plate is made of a transparent plastic or glass material having a transmittance of 80% or more and a refractive index of 1.3 to 1.8, and the asymmetric prism pattern is formed of acute triangles having acute angles .

In addition, acute angle triangles (formed by vertexes A, B, and C) are formed such that one side (BC side) contacts one side surface of the light guide plate, and two sides (AB sides, AC side) (AB side) and the AC side are different from each other, or one side (BC side) is in contact with one side surface of the light guide plate, and the other side (AB side, AC side) It is preferable that the angle formed by the AC transition is 30 ° to 70 °.

The angle between the AB side and the AC side is such that an imaginary line is connected to the vertex A perpendicular to the BC side and an angle between the virtual line and the AB side and the AC side is 0 ° to 10 ° do.

The backlight unit according to the present invention can be applied to various product groups by implementing a transparent display by removing a reflective sheet by applying a highly efficient light guide plate oriented at a certain angle and reducing the material cost compared to the conventional display.

And the light emitted by the LED light source is led to the front surface of the backlight unit, that is, the light is emitted perpendicularly, thereby improving the front exit light luminance.

FIG. 1 is a view illustrating a structure of a transparent backlight unit having a prism light guide plate according to an embodiment of the present invention. FIG.
FIGS. 2 and 3 are cross-sectional views showing a light exit path of the light guide plate of the present invention,
And,
4 is an enlarged view of the prism pattern of the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms "part," "unit," "module," "device," "unit," and the like are used in the description to mean at least one unit for processing a function or an operation. Lt; / RTI >

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a transparent backlight unit having a prism light guide plate according to an embodiment of the present invention. Referring to FIG.

As shown, the light guide plate 120 of the present invention is interposed between the object 140 and the transparent TFT-LCD 110 so that objects or images on the opposite side can be clearly seen, And to provide a high-luminance light to the TFT-LCD so as to include an asymmetric prism pattern.

In the transparent TFT-LCD 110, a pixel region is defined by a plurality of gate lines and data lines crossing each other, a thin film transistor is provided at each intersection point, and one-to-one correspondence with transparent pixel electrodes formed in each pixel region, do.

Since the transparent TFT-LCD 110 has a general structure, a detailed description thereof will be omitted.

The light guide plate 120 is made of a transparent plastic or a glass material having a transmittance of 80% or more and a refractive index of 1.3 to 1.8.

For example, transparent PMMA (PolymethylMethacrylate) having a refractive index of 1.49 and transparent PET (Polyethylene terephthalate) having a refractive index of 1.64 can be used.

The light guiding plate 120 has excellent transparency, weather resistance, and colorability. The light guiding plate 120 is formed of a transparent TFT-LCD (liquid crystal display) so as to induce diffusion of light when light is transmitted and to supply light so that the difference in transmittance represented by the transparent TFT- (110).

That is, the light emitted by the LED light sources 130 provided in the light guide plate 120 is guided to the front of the TFT-LCD 110, that is, the light is emitted vertically, thereby improving the front exit light luminance.

The light guide plate 120 may be formed by arranging the asymmetric prism patterns 121 on the lower surface 123 of the light guide plate in the longitudinal direction of the light guide plate so as to guide the light incident from the LED light source 130, And the light from the light source 130 is vertically emitted to the upper surface 122.

The LED light source 130 is provided on one side of the light guide plate 120 so as to face the light incident surface 124 of the light guide plate 120 to form an edge light guide plate and the light guide plate 120, The light incident on the light guide plate 120 is uniformly distributed over a wide area of the light guide plate 120 and travels through the light guide plate 120 by total reflection to provide a surface light source to the TFT-LCD 110.

 The LED light source 130 uses a blue LED including a blue LED chip having excellent luminous efficiency and luminance for improving the luminous efficiency and brightness and uses a phosphor such as yttrium aluminum garnet (YAG: Ce) doped with cerium And a yellow phosphor.

The blue light emitted from the LED light source 130 is mixed with the yellow light emitted by the phosphor through the phosphor, thereby realizing the white light.

The light guide plate 130 includes an asymmetrical prism pattern 121 on one side in order to supply a uniform surface light source to the transparent TFT-LCD 110. The prism pattern 121 is disposed inside the light guide plate 120 And guides the incident light.

That is, the light incident from the LED light source 130 into the light guide plate 120 is totally reflected by the prism pattern 121 formed on the lower surface 123 of the light guide plate 120, .

Here, the light emitted from the light guide plate 130 of the present invention is vertically incident on the transparent TFT-LCD 110.

The transparent TFT-LCD 110 has a prism shape having a specific shape for guiding light to the lower surface 123 of the light guide plate 120, by positioning the light guide plate 120 on the back surface of the transparent TFT- It is possible to prevent the visibility of the transparent TFT-LCD 110 from being lowered even if the pattern 121 is formed with a predetermined distance or a small size.

Specifically, the light guide plate 120 includes a prism pattern 121 having a specific shape on one side thereof. The prism pattern 121 may include a prism pattern 121 having a predetermined shape. The light emitted from the LED light source 130 may be incident on the light guide plate 120, The pattern 121 formed on the lower surface of the light guide plate 120 may be formed with a certain distance or a small size in order to realize a high brightness surface light source.

Particularly, a prism pattern is formed on the lower surface 123 of the light guide plate 120 to induce diffusion of light by the light guide plate itself, so that the light guide plate itself has a clearer appearance than the case where the light guide plate itself is not located on the back surface of the transparent TFT- The transparent TFT-LCD 110 can see the object or the image located on the opposite side.

The prism pattern 121 may be formed on the lower surface 123 of the light guide plate 120 so as to be spaced apart from the prism pattern 121 or to have a small size so that the light emitted from the LED light source 130 is guided to the inside of the light guide plate 120 Or a planar light source of high brightness can be implemented through the light guide plate 120, thereby improving the light efficiency of the backlight unit.

By improving the light efficiency of the backlight unit as described above, it is possible not only to realize an image to be implemented in the transparent TFT-LCD 110 at a high luminance, You can see objects or images clearly.

For this purpose, the prism pattern 121 is formed of acute triangles, each of which has an acute angle formed by an acute angle formed by forming an asymmetric triangle at an obtuse angle, so that a plurality of obtuse-angled shapes are formed on one side of the light guide plate 120 along the longitudinal direction of the incident surface 124 The prism patterns 121 are arranged with a certain distance therebetween.

Referring to an enlarged view of the prism pattern of the present invention shown in FIG. 4, the top view is a top view of the pattern, and the bottom view is a side view of the pattern.

As shown in the figure, a prism pattern is formed by an acute angle triangle (formed by vertices A, B, and C), and one side (BC side) contacts the lower surface 123 of the light guide plate 120, Is formed at an oblique angle in the direction of the upper surface 122 of the light guide plate 120 where the transparent TFT-LCD is located, and the lengths of the AB side and the AC side are formed differently.

Referring to the drawing, a prism pattern 121 formed on one side of a light guide plate is formed to incline at a certain angle (?) Toward an upper surface 122 with respect to a light incoming surface 124 (arrow direction).

That is, one side (BC side) is in contact with the lower surface 123 of the light guide plate 120 and the other side (AB side, AC side) is formed in the upper surface 122 of the light guide plate 120 at an obtuse angle, And the angle formed by the AC transition is 30 ° to 70 °.

When the angle between the AB side and the AC side is less than 30 degrees, the incident light 'a' passes through the pattern 121 and the light is not projected onto the TFT-LCD 110, .

When the angle between the AB side and the AC side is 60 degrees or more, the incident light 'a' is totally reflected in the pattern 121 and the light projected onto the TFT-LCD 110 is intensively generated at a specific portion, Uneven problems arise.

More specifically, when an imaginary line at the vertex A is connected perpendicularly to the BC side, the angle formed by the AB side and the AC side is such that the angle Aa formed by the virtual line and the AB side is 30 ° to 60 °, And the angle (Ab) between the line and the AC side is set to 0 to 10 degrees.

When the angle between the AB side and the imaginary line is less than 30 degrees, the incident light 'a' passes through the pattern 121 and the light is not projected onto the TFT-LCD 110, .

When the angle between the AB side and the imaginary line is 60 degrees or more, the incident light 'a' is totally reflected in the pattern 121 and the light projected onto the TFT-LCD 110 is intensively generated at a specific portion, Uneven problems arise.

When the angle between the AC side and the imaginary line is 10 degrees or more, as shown in FIG. 2, when the light a passes through the AB side of the pattern 121a, the light does not pass through the AC side or is emitted to the air The luminance is lowered.

As described above, the prismatic patterns 121a, 121b and 121c formed on the lower surface 123d of the light guide plate 120 can be formed to have a compact density and a small size, 130 can be incident on the light guide plate 120 without any loss of light, and a high-brightness surface light source can be realized through the light guide plate 120. FIG.

Referring to the drawing, the case where the angle A-b is formed to be 0 占 is shown as an example.

Hereinafter, the light guide of the light guide plate according to the embodiment of the present invention will be schematically described with reference to FIGS. 2 and 3. FIG.

The external light of the object 140 incident from the opposite side of the transparent TFT-LCD 110 passes through the light guide plate 120 and the transparent TFT-LCD 110 as it is, The object or the image located on the opposite side of the transparent TFT-LCD 110 can be seen.

In addition, when an image is implemented in the transparent TFT-LCD 110, an object or an image located on the opposite side of the transparent TFT-LCD 110 can be viewed. In this case, And the image is realized in the transparent TFT-LCD 110 through the light.

That is, the light emitted from the light guide plate 120 is provided to the transparent TFT-LCD 110, and the transparent TFT-LCD 110 implements the image through the difference in transmittance of the light emitted from the light guide plate 120.

The lights a and b emitted from the LED light source 130 are guided to the inside of the light guide plate 120 through the light incoming surface 124 of the light guide plate 120, And the light incident into the light guide plate 120 is guided by the prism patterns 121a, 121b and 121c formed on the lower surface 123 of the light guide plate 120 to be guided to the upper surface 122 of the light guide plate 120, As shown in FIG.

Since the light guide plate 120 has a refractive index of 1.3 to 1.8 and the refractive index of air is 1, the light emitted through the upper surface 122 of the light guide plate 120 passes through the light guide plate 120, And proceeds to a medium having a small refractive index.

First, the light (a) is emitted from a light source and is incident on the upper surface 122 at a critical angle or more, so that the first total reflection occurs. The first total reflected light enters the pattern 121a at a critical angle or less, Then, the light is totally reflected by the lower surface 123 and the upper surface 122, is incident on the pattern 121c at a critical angle or more and is totally reflected, and then incident on the upper surface 122 at a critical angle or less.

Therefore, when the angle of A-a is 30 or more, total reflection and transmission are repeatedly generated, so that uniform brightness can be exhibited.

The light emitted toward the upper surface 122 of the light guide plate 120 is directed toward the TFT-LCD 110 with the upper surface 122 of the light guide plate 120 bounded by the difference between the refractive indexes of the light guide plate 120 and air. And is emitted vertically.

It is natural to follow the Snell's law at this time.

Here, in the medium in which the refractive index is large, light incident on the critical angle or more is totally reflected in the progress of the light in the medium.

Accordingly, the light incident into the light guide plate 120 passes through the light guide plate 120 having a large refractive index, and then passes through the upper surface 122 of the light guide plate 120, which is a boundary of the medium having a different refractive index, The light transmitted through the light guide plate 120 is vertically emitted toward the TFT-LCD 110, and the TFT-LCD 110 provides a uniform surface light source.

Referring to FIG. 3, it can be seen that a clear image is displayed even when the outgoing light (a, b) passes through the light guide plate and exits (a dotted line in the drawing).

The prism pattern at this time is an image when the angle "A-a" is 48 ° and the angle "A-b" is 0 °.

As described above, according to the transparent backlight unit provided with the prism light guide plate of the present invention, asymmetrical triangular prism patterns are formed on the lower surface of the light guide plate, so that the surface light source of uniform brightness can be emitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

110: TFT-LCD 120: light guide plate
121a, 121b, 121c:
122: upper surface 123: lower surface
124: incoming surface 130: LED light source
140: Things

Claims (6)

In a transparent backlight unit having an edge type prism light guide plate to which at least one LED light source is applied,
A transparent backlight unit having a prism light guide plate for arranging an asymmetric prism pattern on one side of a longitudinal direction of a light guide plate on which light of the LED light source is incident in a shape selected from an engraved and an embossed shape, .
The method according to claim 1,
The light-
A transparent backlight unit comprising a transparent plastic or a glass prism light guide plate having a transmittance of 80% or more and a refractive index of 1.3 to 1.8.
The method according to claim 1,
The asymmetric prism pattern
A transparent backlight unit comprising a prism light guide plate having an asymmetric triangle formed at an oblique angle and a triangular prism having acute angles formed by three sides.
The method of claim 3,
The acute angle triangles (formed by vertices A, B, and C)
And a prism light guide plate having one side (BC side) contacting one side of the light guide plate and two sides (AB sides, AC sides) being formed at the other side of the light guide plate at an oblique angle, Transparent backlight unit.
The method of claim 4,
The acute angle triangles (formed by vertices A, B, and C)
(AB side, AC side) is formed on the other side of the light guide plate at an obtuse angle, and an angle between the AB side and the AC side is 30 to 70 degrees A transparent backlight unit comprising a prism light guide plate.
The method of claim 5,
The angle between the AB side and the AC side is
Wherein a virtual line is connected to the vertex A perpendicular to the BC side, and an angle formed by the virtual line, the AB side, and the AC side is 0 DEG to 10 DEG.
KR1020160004273A 2016-01-13 2016-01-13 Crystal backlight unit KR20170084882A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019196528A1 (en) * 2018-04-13 2019-10-17 京东方科技集团股份有限公司 Light guide plate and manufacturing method therefor, front-facing light source and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019196528A1 (en) * 2018-04-13 2019-10-17 京东方科技集团股份有限公司 Light guide plate and manufacturing method therefor, front-facing light source and display device

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