KR20170090298A - Back light unit for liquid display panel - Google Patents

Back light unit for liquid display panel Download PDF

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Publication number
KR20170090298A
KR20170090298A KR1020160010975A KR20160010975A KR20170090298A KR 20170090298 A KR20170090298 A KR 20170090298A KR 1020160010975 A KR1020160010975 A KR 1020160010975A KR 20160010975 A KR20160010975 A KR 20160010975A KR 20170090298 A KR20170090298 A KR 20170090298A
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KR
South Korea
Prior art keywords
light
guide plate
light guide
resin
liquid crystal
Prior art date
Application number
KR1020160010975A
Other languages
Korean (ko)
Inventor
이정민
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.)
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Publication date
Application filed by 주식회사 파인텍 filed Critical 주식회사 파인텍
Priority to KR1020160010975A priority Critical patent/KR20170090298A/en
Publication of KR20170090298A publication Critical patent/KR20170090298A/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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G02F2001/133607—

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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 backlight device applied to a liquid crystal display panel, and the backlight device can improve a luminance distribution. According to an embodiment of the present invention, the backlight device comprises: a light source providing light; a light guide plate changing a light distribution provided from the light source; a reflection sheet stacked on a lower surface of the light guide plate, and reflecting the light emitted to the lower surface of the light guide plate to an upper surface of the light guide plate; and a prism sheet stacked on the upper surface of the light guide plate, collecting the light diffused from the upper surface of the light guide plate, and transmitting the light to the liquid crystal display panel. A transparent substrate film which uniformly distributes the light from the light source and improves a perpendicular incidence property is coated on the upper surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit for a liquid crystal display panel,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device applied to a liquid crystal display panel, and a backlight device capable of improving luminance distribution.

Since the liquid crystal material injected between the TFT substrate and the color filter is not a luminescent material that self-luminesces but a light-absorbing material that displays the amount of light coming from the outside and displays on the screen, unlike other display devices, A separate device for irradiating light, that is, a backlight device is necessarily required.

1 is a cross-sectional view showing a configuration of a conventional liquid crystal display device.

The liquid crystal display device 1 includes a backlight device 10 for generating light and a display unit 20 provided above the backlight device 10 and receiving light from the backlight device 10 to display an image .

The display unit 20 includes a liquid crystal display panel 25, an upper polarizer 24 and a lower polarizer 21 positioned above and below the liquid crystal display panel 25. The liquid crystal display panel 25 includes a TFT substrate and a color filter substrate 23 on which electrodes are formed, and a liquid crystal layer (not shown) injected between the TFT substrate and the color filter substrates 11 and 12.

The backlight device 10 includes a mold frame (not shown) having a storage space formed therein, a reflective sheet 12 provided on the bottom surface of the storage space for reflecting light toward the liquid crystal display panel, A light source 11 disposed between the light guide plate 13 and the side wall of the storage space to emit light; an optical sheet 11 stacked on the upper surface of the light guide plate 13 to diffuse and condense light; And a top chassis (not shown) mounted on the upper portion of the mold frame to cover an area from a predetermined position of the edges of the liquid crystal display panel to a side surface of the mold frame.

The optical sheets 17 include a diffusion sheet 14 for diffusing light and a prism sheet 15 for collecting light diffused and diffused on the upper surface of the diffusion sheet 14 and transmitting the condensed light to the liquid crystal display panel 20 And a protective sheet 16 for protecting the diffusion sheet 14 and the prism sheet 15. In this way, the optical sheet 17 applied to the BLU (Back Light Unit) has a composite sheet structure in which two or three sheets are laminated to form one sheet. Such a composite sheet is in the spotlight in the market due to the effects of thinning, shielding force, high brightness, reduction of the number of processes to be provided.

However, since the optical sheets 17 made of such composite sheets use two or three sheets of fabric in the manufacturing process, the cost of the product due to the cost of the fabric is high, and a process of joining a plurality of sheets is essential. There is a problem that causes a lot of defects in the process.

Korean Patent Publication No. 10-2010-0057483

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light guide plate capable of diffusing light in a light guide plate applied to a backlight unit.

Embodiments of the present invention provide a light source that provides light; A light guide plate for changing a distribution of light provided from the light source; A reflective sheet laminated on a lower surface of the light guide plate and reflecting the light emitted to the lower surface of the light guide plate to the upper surface of the light guide plate; And a prism sheet laminated on the upper surface of the light guide plate and collecting light diffused from the upper surface of the light guide plate and transmitting the condensed light to the liquid crystal display panel. The prism sheet uniformly distributes the light luminance from the light source, And the transparent substrate film is coated on the upper surface.

And a pattern is formed on the upper surface of the transparent base film.

The pattern may be a dot pattern or a prism pattern.

The transparent base film may include any one of a fluorene resin, an epoxy acrylate resin, a modified polyester type oligomer resin, and a monomer resin, a photoinitiator, a UV absorber, and an antioxidant.

Wherein the transparent base film is a film obtained by mixing 0.5 to 7% by weight of a photoinitiator, 0.5 to 2% by weight of an UV absorber, 0.5 to 2% by weight of an antioxidant, and a fluorene resin, an epoxy acrylate resin, or a modified polyester type oligomer resin By weight of a resin of 2 to 80% by weight.

The transparent base film may be characterized by having 0.5 to 7% by weight of a photoinitiator, 0.5 to 2% by weight of an UV absorber, 0.5 to 2% by weight of an antioxidant, and 20 to 80% by weight of a monomer resin.

According to the embodiment of the present invention, since the transparent substrate film attached to the upper surface of the light guide plate is provided, the light emitted from the light guide plate used in the backlight device of the liquid crystal display device can be diffused evenly and brightness can be improved without the diffusion sheet.

1 is a cross-sectional view showing a configuration of a conventional liquid crystal display device.
2 is a cross-sectional view showing a configuration of a liquid crystal display device according to an embodiment of the present invention.
3 is a view showing a state in which a dot-shaped pattern is formed on an upper surface of a transparent substrate film according to an embodiment of the present invention.
4 is a view showing a state in which a prism-shaped pattern is formed on the upper surface of a transparent substrate film according to an embodiment of the present invention.
5 is a view showing an optical path of a light guide plate with a transparent substrate film on which a prism pattern is formed according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to achieve them, will be apparent from the following detailed description of embodiments thereof taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art. And the present invention is only defined by the scope of the claims. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

2 is a cross-sectional view showing a configuration of a liquid crystal display device according to an embodiment of the present invention.

Hereinafter, a liquid crystal display device will be taken as an example of a display device, and a backlight device will be described by taking an edge type light source as an example, but it may be applied to a vertical light source as well.

The liquid crystal display device includes a backlight device 100 for generating light and a display unit 200 provided on the backlight device 100 and receiving light from the backlight device 100 to display an image.

The display unit 200 includes a liquid crystal display panel 250, an upper polarizer 240 and a lower polarizer 210 positioned above and below the liquid crystal display panel 250. The liquid crystal display panel 250 includes a TFT substrate on which electrodes are formed, color filter substrates 220 and 230, and a liquid crystal layer (not shown) injected between the TFT substrate and the color filter substrates 220 and 230. The liquid crystal display panel 250 is composed of two substrates arranged so as to face each other and a liquid crystal layer interposed between the two substrates. A pixel region is defined by a plurality of gate lines and data lines arranged in a matrix on the substrate. A thin film transistor for controlling a signal supplied to each pixel and a pixel electrode connected to a thin film transistor are formed on a substrate where a gate line and a data line intersect and a color filter and a common electrode are formed on another substrate. A polarizing plate is formed on the back surface of the substrate.

The backlight device 100 includes a light source 110 for generating and providing light and a light guide plate 130 for guiding the light generated by the light source 110 to the liquid crystal display panel 250.

The light source 110 includes a lamp 110a that generates light and a lamp reflector 110b that surrounds the lamp 110a. The light generated from the lamp 110a is incident on the light guide plate 130 to be described later and the lamp reflector 110b reflects the light generated from the lamp 110a toward the light guide plate 130 to be incident on the light guide plate 130 Thereby increasing the amount of light.

A light guide plate (LGP) 130 changes the distribution of light provided from the light source. Accordingly, the light guide plate 130 is provided on one side of the light source 110 to guide the light from the light source 110.

The reflective sheet 120 is stacked on the lower surface of the light guide plate 130 and reflects light emitted to the lower surface of the light guide plate 130 to the upper surface of the light guide plate 130. Accordingly, the reflective sheet 120 can reflect the light leaking to the lower surface of the light guide plate 130 to the upper side of the light guide plate 130, thereby improving the brightness.

The prism sheet 142 is stacked on the upper surface of the light guide plate 130 to condense the light diffused from the upper surface of the light guide plate 130 and transmit the condensed light to the liquid crystal display panel.

The protective sheet 141 is laminated on the upper surface of the prism sheet 142 to protect the prism sheet.

Meanwhile, a conventional backlight unit (BLU) has a separate diffusion sheet between the light guide plate 130 and the prism sheet for improving the efficiency of the light guided by the light guide plate 130. The diffusion sheet scatters the light incident from the light guide plate 130 to even out the luminance distribution of light.

In this case, however, it becomes an obstacle to the slim of the backlight device. Thus, the present invention coating a transparent resin material for diffusion function on the upper surface of the light guide plate 130 removes the diffusion sheet from the optical sheet so that only the prism sheet 142 and the protective sheet 141 exist as an optical sheet .

To this end, the present invention coats the transparent substrate film 141 on the upper surface of the light guide plate 130, which uniformizes the luminance distribution of light from the light source and improves vertical incidence. The transparent base film 141 may be coated in the form of a diffusion haze coating. The transparent base film 141 has a light control function, so that the light guide plate 130 can function as the light guide plate 130 and can function as a diffusion sheet.

It is preferable that a pattern is formed on the upper surface of the transparent base film 141 so that the transparent base film 141 uniformizes the luminance distribution of light and improves the perpendicular incidence. The pattern layer may be formed such that a dot-shaped pattern is formed on the upper surface of the transparent base film 141 as shown in FIG. 3, or a prism-shaped pattern is formed as shown in FIG. 4 have.

A dot or prism pattern is formed on the upper surface of the transparent base film 141 so that light emitted through the upper surface of the light guide plate 130 is refracted in the pattern of the transparent base film 141 to improve the luminance distribution And further, the vertical incidence property can be improved. Here, the term " perpendicular incidence " refers to the degree of vertical incidence toward the liquid crystal display panel. For reference, in the case of the prism pattern, as shown in FIG. 5, light passing through the upper surface of the light guide plate 130 is refracted in the prism pattern of the transparent base film 141, and the perpendicular incidence is improved.

As described above, the transparent base film 141 functions as a light control film for uniformly diffusing light emitted from the light guide plate 130 of the backlight unit and improving brightness. In order to maximize the transmittance efficiency, 141) may contain any one of a fluorene resin, an epoxy acrylate resin, a modified polyester type oligomer resin and a monomer resin, a photoinitiator, a UV absorber, and an antioxidant.

That is, the transparent base film 141 may be a material including a fluorene resin, a photoinitiator, a UV absorber, and an antioxidant.

The transparent base film 141 may be made of a material including an epoxy acrylate resin, a photoinitiator, a UV absorber, and an antioxidant.

The transparent base film 141 may be made of a material including a modified polyester type oligomer resin, a photoinitiator, a UV absorber, and an antioxidant.

The transparent base film 141 may be a material containing an aliphatic and aromatic monomer resin, a photoinitiator, a UV absorber, and an antioxidant.

On the other hand, as a result of the experiment, it was found that the weight ratio of the resins contained in the transparent base film 141 was 0.5 to 7% by weight of the photoinitiator, 0.5 to 2% by weight of the UV absorber, 0.5 to 2% , An epoxy acrylate resin, and a modified polyester type oligomer resin in an amount of 2 to 80% by weight.

That is, the respective weight ratio of the resins contained in the transparent base film 141 is preferably 0.5 to 7% by weight of the photoinitiator, 0.5 to 2% by weight of the UV absorber, 0.5 to 2% by weight of the antioxidant, By weight.

Each weight ratio of the resins contained in the transparent base film 141 is preferably 0.5 to 7% by weight of a photoinitiator, 0.5 to 2% by weight of an UV absorber, 0.5 to 2% by weight of an antioxidant, By weight.

The weight ratio of each of the resins contained in the transparent base film 141 is preferably 0.5 to 7% by weight of the photoinitiator, 0.5 to 2% by weight of the UV absorber, 0.5 to 2% by weight of the antioxidant, To 80% by weight.

On the other hand, when an aliphatic or aromatic monomer resin other than a fluorene resin, an epoxy acrylate resin or a modified polyester type oligomer resin is used, it is preferable that the aliphatic and aromatic monomer resin is contained in an amount of 20 to 80% by weight.

Therefore, each weight ratio of the resins contained in the transparent base film 141 is preferably from 0.5 to 7% by weight of the photoinitiator, 0.5 to 2% by weight of the UV absorber, 0.5 to 2% by weight of the antioxidant, 20 to 80% .

The embodiments of the present invention described above are selected and presented in order to facilitate the understanding of those skilled in the art from a variety of possible examples. The technical idea of the present invention is not necessarily limited to or limited to these embodiments Various changes, modifications, and other equivalent embodiments are possible without departing from the spirit of the present invention.

100: backlight device 110: light source
120: reflective sheet 130: light guide plate
131: transparent substrate film

Claims (6)

A light source for providing light;
A light guide plate for changing a distribution of light provided from the light source;
A reflective sheet laminated on a lower surface of the light guide plate and reflecting the light emitted to the lower surface of the light guide plate to the upper surface of the light guide plate; And
And a prism sheet stacked on the upper surface of the light guide plate to condense the light diffused from the upper surface of the light guide plate and transmit the condensed light to the liquid crystal display panel,
Wherein the transparent substrate film is coated on the upper surface to uniformly distribute the luminance of the light from the light source and improve vertical incidence.
The method according to claim 1,
Wherein a pattern is formed on an upper surface of the transparent base film.
[2] The method according to claim 1,
Wherein the backlight device has a dot-like pattern or a prism-like pattern.
The transparent substrate film according to claim 1,
A backlight device for a liquid crystal display panel comprising a resin selected from a fluorene resin, an epoxy acrylate resin, a modified polyester type oligomer resin and a monomer resin, a photoinitiator, a UV absorber and an antioxidant.
5. The transparent substrate film according to claim 4,
0.5 to 2% by weight of a photoinitiator, 0.5 to 2% by weight of an UV absorber, 0.5 to 2% by weight of an antioxidant, and 2 to 80% by weight of a fluorene resin, an epoxy acrylate resin or a modified polyester- % Of the thickness of the liquid crystal layer.
5. The transparent substrate film according to claim 4,
, 0.5 to 7 wt% of a photoinitiator, 0.5 to 2 wt% of an UV absorber, 0.5 to 2 wt% of an antioxidant, and 20 to 80 wt% of a monomer resin.
KR1020160010975A 2016-01-28 2016-01-28 Back light unit for liquid display panel KR20170090298A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160010975A KR20170090298A (en) 2016-01-28 2016-01-28 Back light unit for liquid display panel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160010975A KR20170090298A (en) 2016-01-28 2016-01-28 Back light unit for liquid display panel

Publications (1)

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KR20170090298A true KR20170090298A (en) 2017-08-07

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Family Applications (1)

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Country Status (1)

Country Link
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