KR20080063598A - Backlight unit and liquid crystal display having the same - Google Patents

Backlight unit and liquid crystal display having the same Download PDF

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Publication number
KR20080063598A
KR20080063598A KR1020070000212A KR20070000212A KR20080063598A KR 20080063598 A KR20080063598 A KR 20080063598A KR 1020070000212 A KR1020070000212 A KR 1020070000212A KR 20070000212 A KR20070000212 A KR 20070000212A KR 20080063598 A KR20080063598 A KR 20080063598A
Authority
KR
South Korea
Prior art keywords
guide plate
light guide
light
backlight unit
optical sheet
Prior art date
Application number
KR1020070000212A
Other languages
Korean (ko)
Inventor
김세봉
Original Assignee
삼성전자주식회사
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 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020070000212A priority Critical patent/KR20080063598A/en
Publication of KR20080063598A publication Critical patent/KR20080063598A/en

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Classifications

    • 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

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

Abstract

The present invention provides a backlight unit including a light source, a light guide plate for converting light emitted from the light source into a surface light source, and an optical sheet disposed on the light guide plate to surround at least one side of the light guide plate, and a liquid crystal display device having the same. To provide.

As such, the present invention does not generate friction or interference due to the relative flow of the light guide plate and the optical sheet, so that the optical pattern formed on either side may not be damaged.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

1 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a developed view showing a first optical sheet according to an embodiment of the present invention.

3 is a cross-sectional view showing a first optical sheet according to an embodiment of the present invention.

4 is an assembled cross-sectional view of the backlight unit according to the embodiment of the present invention.

<Explanation of protection for main parts of drawing>

110: upper chassis 120: liquid crystal display panel

130: optical sheet 140: light guide plate

150: lamp unit 160: reflective sheet

170: lower chassis

The present invention relates to a backlight unit and a liquid crystal display device having the same, and more particularly, to a backlight unit and a liquid crystal display device having the same, which can prevent deterioration of optical characteristics due to the relative flow of the optical sheet and the light guide plate. will be.

Liquid crystal display is a display device that realizes an image by controlling the amount of light incident from a light source using the optical anisotropy of liquid crystal molecules and the polarization characteristics of a polarizing film. In recent years, its power consumption is small, and its application range is rapidly expanding.

The liquid crystal display includes a liquid crystal display panel including an upper substrate on which a black matrix, a color filter, and a common electrode are formed, a lower substrate on which a thin film transistor and a pixel electrode are formed, and a liquid crystal layer filled between two substrates. It further comprises a polarizing plate attached to both sides of the panel. In addition, the liquid crystal display panel does not emit light by itself, and thus requires a backlight unit that provides light at its rear surface so as to visually recognize the display contents.

The backlight unit includes a lamp unit, a light guide plate, a plurality of optical sheets disposed above the light guide plate, a reflective sheet disposed below the light guide plate, and an accommodating member for storing them. The light guide plate or the optical sheet may be formed with an optical pattern for achieving a desired purpose, such as improving the viewing angle and ensuring luminance uniformity. For example, a prism pattern having a cross section of a triangular, hemispherical, or lenticular structure may be formed on one side of the light guide plate or the optical sheet. Meanwhile, referring to the mounting process of the backlight unit, the reflective sheet is mounted on the bottom surface of the housing member, the light guide plate is fixed on the reflective sheet, and a plurality of optical sheets are sequentially stacked on the top surface of the light guide plate. In this case, the optical sheet is seated on the upper surface of the light guide plate without a separate fixing means or seated on a stepped portion formed on the sidewall of the accommodating member and fixed with double-sided tape.

However, the structure of such a backlight unit may flow within a certain range because the light guide plate and the optical sheet are not fixed to each other, which may cause friction or interference with each other, thereby damaging the optical pattern formed on either side. There is. If the optical pattern is damaged, a screen defect in the form of dots appears on the screen of the corresponding area. That is, a white point phenomenon occurs and display quality deteriorates.

The present invention is derived to solve the above problems, and by forming the edge region of the optical sheet to surround the side of the light guide plate, it is possible to prevent damage to the optical pattern and degradation of the optical properties due to the relative flow of the optical sheet and the light guide plate. An object of the present invention is to provide a backlight unit and a liquid crystal display device having the same.

The backlight unit according to the present invention for achieving the above object, a light source, a light guide plate for converting the light emitted from the light source into a surface light source and an optical sheet disposed on the light guide plate to surround at least one side of the light guide plate It includes.

The optical sheet includes a first region formed in an upper region of the light guide plate and a second region bent downward from an edge of the first region.

In the first region, a scattering pattern for diffusing light or a prism pattern for collecting light is preferably formed.

The second region is preferably formed to surround opposing side surfaces of the light guide plate.

Preferably, a bend line is formed at the boundary between the first region and the second region. The bending line may be formed by arranging a plurality of holes in a row or a plurality of rows.

The backlight unit may further include an adhesive member for bonding the light guide plate and the optical sheet. The adhesive member is preferably formed at the edge of the upper surface of the light guide plate, and may be formed of a double-sided tape.

A liquid crystal display device according to the present invention for achieving the above object includes a liquid crystal display panel for displaying an image, and a backlight unit for providing light to the liquid crystal display panel, the backlight unit is a light source, A light guide plate for converting the emitted light into a surface light source and an optical sheet disposed on the light guide plate to surround at least one side of the light guide plate.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art the scope of the invention. It is provided for complete information. Like reference numerals in the drawings refer to like elements.

1 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display according to the present exemplary embodiment includes a liquid crystal display panel 120 displaying an image, a backlight unit 200 disposed below the liquid crystal display panel 120, and an upper portion accommodating the liquid crystal display panel 120. The chassis 110 and the lower chassis 170.

The liquid crystal display panel 120 includes a lower substrate 121 including a plurality of gate lines, a plurality of data lines crossing the gate lines, a thin film transistor and a pixel electrode formed at an intersection of the gate lines and the data lines, and a lower substrate 121. And an upper substrate 122 corresponding to the substrate 121 and having a common electrode and a color filter formed thereon, and a liquid crystal layer (not shown) positioned between the two substrates 121 and 122. A gate driver for driving the gate line and a source driver for driving the data line may be provided at one side of the liquid crystal display panel 120, typically, an outer region of the lower substrate 121. Here, the gate driver is connected to each gate line of the liquid crystal display panel 120 to apply a predetermined gate signal to each gate line, and the data driver is connected to each data line of the liquid crystal display panel 120 to predetermined A data signal is applied to each data line. The gate driver and the data driver are manufactured in a chip shape and mounted on the liquid crystal display panel 120 using any one of a chip on board (COB), tape automated bonding (TAB), and chip on glass (COG) method. It is preferable. For example, when the resolution of the liquid crystal display panel 120 is low, the TAB method is suitable, and when the resolution is high, the COG method is suitable. Of course, the chip may be directly formed on the lower substrate 121 by an amorphous silicon gate (ASG) method.

Meanwhile, the backlight unit 200 including the lamp unit 150 is disposed on the rear surface of the liquid crystal display panel 120. The backlight unit 200 may be configured in an edge type method or a direct type method according to the position of the lamp unit 150. The backlight unit 200 of the present embodiment emits light to the lamp unit 150. And the light guide plate 140 disposed on the side surface of the lamp unit 150, the plurality of optical sheets 130 disposed on the light guide plate 140, and the reflective sheet 160 disposed below the light guide plate 140. It is configured in an edge-type manner including.

The lamp unit 150 includes at least one lamp 151 to 153 as a light source to provide light to the side surface of the light guide plate 140. The lamps 151 to 153 may include an electroluminescent lamp (EL), a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), and the like. A light emitting diode that is a point light source is used. Although not shown, the lamp unit 150 may include a lamp holder for fixing the lamps 151 to 153 at a predetermined position, and light generated radially from the lamps 151 to 153 in one direction. It may further include a reflector (reflector) for condensing into. Of course, the lamp holder and the reflector may be integrally formed. The light generated by the backlight unit 200 is transmitted through the liquid crystal display panel 120 while the transmittance is changed and colored, and is emitted to the front of the liquid crystal display panel 120 to realize a color image.

The light guide plate 140 converts light having an optical distribution in the form of a point light source incident from the lamp unit 150 into light having an optical distribution in the form of a surface light source. As the light guide plate 140, a wedge-shaped plate or a flat plate having a uniform thickness may be used, which becomes thinner from the surface facing the lamp unit 150 to the opposite surface. Light is incident on one side of the plate. The light incident portion is formed, the upper surface is formed with the light exit portion is emitted, the lower surface is formed with a reflecting portion for allowing the light incident through the light incident portion is emitted through the light exit portion. In this case, the reflector may have a cross-sectional structure such as a triangle, a hemispherical shape, a lens shape, and the like, and may be configured by a prism pattern arranged in parallel in one direction. Of course, when the separate reflective sheet 160 is disposed below the light guide plate 140, the reflective part may be omitted. On the other hand, as the light guide plate 140, it is preferable to use a translucent material having a constant refractive index, such as polymethy methacrylate (PMMA), polyolefin or polycarbonate, which is an acrylic resin.

The optical sheet 130 makes the luminance distribution of the light emitted to the upper portion of the light guide plate 140 uniform. The optical sheet 130 may include a first optical sheet 131, a second optical sheet 132, and a third optical sheet 133 from below. Here, the first optical sheet 131 is provided with a scattering pattern to scatter and diffuse light incident from the light guide plate 140 in an upward direction, and the second and third optical sheets 132 and 133 may have a lower portion. It has a prism pattern formed to cross each other on the surface serves to condense the light emitted in the upper direction by vertically changing the light incident obliquely from the light incident from the first optical sheet 131.

The first optical sheet 131 of the plurality of optical sheets 131, 132, 133 is attached to the light guide plate 140 by an adhesive member 131a, and is formed to surround at least one side surface of the light guide plate 140.

2 is a developed view showing a first optical sheet according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a first optical sheet according to an embodiment of the present invention.

2 and 3, the first optical sheet 131 is downward from the edge of the first region A1 and the first region A1 that form the light exit portion corresponding to the upper region of the light guide plate 140. It may be divided into a bent second region A2. Here, an adhesive member 131a may be formed in at least some of the edges of the first area A1 to fix the light guide plate 140.

An optical pattern according to a desired purpose is formed in the first area A1 so as to change the optical characteristics of the light incident in the lower direction to be emitted in the upper direction. For example, as shown in the present embodiment, a predetermined scattering pattern (not shown) may be formed in the first region A1 so as to scatter and diffuse light incident in a lower direction in an upper direction. In contrast, a prism having a cross section of a triangular, hemispherical, and lenticular structure is formed in the first region A1 so as to vertically change the light incident at an oblique angle among the light incident in the lower direction to condense the light emitted in the upper direction. A pattern (not shown) may be formed.

A bend line 131b is preferably formed at the boundary between the first area A1 and the second area A2 to facilitate bending. The bend line 131b is formed by arranging a plurality of holes in a row or a plurality of rows, and the shape of the hole is not limited to a specific shape such as a circle, a triangle, a rectangle, and the like.

The adhesive member 131a is formed on at least some of the edges of the first area A1, and is preferably formed in a band shape on opposite edges of the first area A1. As the adhesive member 131a, it is effective to use a double-sided tape having a constant height and coated with an adhesive material on both sides.

Meanwhile, the reflective sheet 160 re-injects light leaking into the lower portion of the light guide plate 140 into the light guide plate 140 so that most of the light emitted from the lamp unit 150 is emitted to the upper portion of the light guide plate 140. Improve the efficiency of light utilization In addition, the reflection amount of the entire incident light is adjusted so that the entire outgoing surface of the backlight unit 200 has a uniform luminance distribution. The reflective sheet 160 may be attached to the lower chassis 170 that accommodates the backlight unit 200 by an adhesive means. In addition, the reflective sheet 160 may be integrally formed with the bottom surface of the lower chassis 170 or the bottom surface of the light guide plate 140.

The upper chassis 110 has a planar portion in which an opening region is defined, and a sidewall portion bent downward from an edge thereof, and is formed in a frame shape in which an image of the liquid crystal display panel 120 is exposed to the outside through the opening region. In this case, a plurality of recesses (not shown) for fastening with the lower chassis 170 may be formed at the side wall of the upper chassis 110.

The lower chassis 170 has a bottom surface on which the backlight unit 200 is seated, and a side wall portion bent upward from an edge thereof, and has a box shape in which an upper surface is opened to provide a storage space having a predetermined depth. In this case, a plurality of protrusions (not shown) for fastening with the upper chassis 110 may be formed at the side wall of the lower chassis 170. Of course, the concave portion formed in the upper chassis 110 and the protrusions formed in the lower chassis 170 may be formed to have fastening structures corresponding to each other.

The liquid crystal display panel 120 and the backlight unit 200 are accommodated in the storage space provided by the combination of the upper chassis 110 and the lower chassis 170. Although not shown, a mold frame surrounding the edge of the liquid crystal display panel 120 which is vulnerable to impact may be provided and accommodated in the storage space.

On the other hand, Figure 4 is an assembly cross-sectional view of the backlight unit according to an embodiment of the present invention, it is shown schematically by cutting the backlight unit assembled in the lower chassis in one direction.

Referring to FIG. 4, the reflective sheet 160, the light guide plate 140, and the plurality of optical sheets 131, 132, and 133 are sequentially stacked on the bottom surface of the lower chassis 170. The first optical sheet 131 is attached to and fixed to the light guide plate 140 by the adhesive member 131a, and is formed to surround at least one side surface of the light guide plate 140. As a result, flow between the first optical sheet 131 and the light guide plate 140 is prevented, and the first optical sheet 131 is spaced apart from the light guide plate 140 by a height of the adhesive member 131a. Therefore, since the friction or interference due to the flow of the light guide plate 140 and the first optical sheet 131 does not occur, there is no fear that the optical pattern formed on either side will be damaged. It doesn't work. In addition, since the first optical sheet 131 is not fixed to the lower chassis 170, which is an accommodation member, deterioration of optical characteristics due to their relative flow may be prevented. In addition, since the bend line 131b is formed in the bent region of the first optical sheet 131, the assembling work is easy. In addition, since the first optical sheet 131 covers not only the upper surface of the light guide plate 140 but also the side surfaces thereof, oblique light leakage or side light leakage due to scratches or processing errors of the light guide plate 140 may be prevented.

As mentioned above, although this invention was demonstrated with reference to the above-mentioned Example and an accompanying drawing, this invention is not limited to this, It is limited by the following claims. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the technical spirit of the following claims.

As described above, the optical sheet according to the present invention is attached to and fixed to the light guide plate by an adhesive member, and is formed to surround at least one side surface of the light guide plate. Therefore, since the friction or interference due to the relative flow of the light guide plate and the optical sheet does not occur, there is no fear that the optical pattern formed on either side will be damaged. As a result, no white spot phenomenon occurs and thus the display quality is not deteriorated. In addition, since the optical sheets are not fixed to the housing member, deterioration of the optical properties due to their relative flow can be prevented. Moreover, since a bending line is formed in the bending area | region of an optical sheet, assembly work is easy. In addition, since the optical sheet covers not only the upper surface of the light guide plate but also the side surface, it is possible to prevent diagonal light leakage or side light leakage due to scratches or processing errors of the light guide plate.

Claims (14)

Light source, A light guide plate for converting light emitted from the light source into a surface light source; And an optical sheet disposed on the light guide plate to surround at least one side surface of the light guide plate. The method according to claim 1, The optical sheet includes a first region formed in an upper region of the light guide plate and a second region bent downward from an edge of the first region. The method according to claim 2, And a scattering pattern for diffusing light or a prism pattern for collecting light. The method according to claim 2, And the second region is bent downward to surround opposite side surfaces of the light guide plate. The method according to claim 2, The backlight unit has a bent line formed at the boundary between the first area and the second area. The method according to claim 5, The bend line is a backlight unit formed by arranging a plurality of holes in a row or a plurality of rows. The method according to claim 1, And a bonding member for bonding the light guide plate to the optical sheet. The method according to claim 1, The adhesive member is a backlight unit formed on the edge of the upper surface of the light guide plate. The method according to claim 8, The adhesive member is a backlight unit consisting of a double-sided tape. A liquid crystal display panel displaying an image, A backlight unit configured to provide light to the liquid crystal display panel; The backlight unit, Light source, A light guide plate for converting light emitted from the light source into a surface light source; And an optical sheet disposed on the light guide plate to surround at least one side surface of the light guide plate. The method according to claim 10, The optical sheet includes a first region formed in an upper region of the light guide plate and a second region bent downward from an edge of the first region. The method according to claim 11, And a scattering pattern for diffusing light or a prism pattern for collecting light. The method according to claim 11, A bent line is formed at a boundary between the first area and the second area. The method according to claim 10, And an adhesive member for adhering the light guide plate and the optical sheet.
KR1020070000212A 2007-01-02 2007-01-02 Backlight unit and liquid crystal display having the same KR20080063598A (en)

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Application Number Priority Date Filing Date Title
KR1020070000212A KR20080063598A (en) 2007-01-02 2007-01-02 Backlight unit and liquid crystal display having the same

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Application Number Priority Date Filing Date Title
KR1020070000212A KR20080063598A (en) 2007-01-02 2007-01-02 Backlight unit and liquid crystal display having the same

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150033142A (en) * 2013-09-23 2015-04-01 엘지디스플레이 주식회사 Backlight Unit and Display Device Using The Same
KR20150144847A (en) * 2014-06-17 2015-12-29 엘지디스플레이 주식회사 Backlight unit and display device having the same
KR20170057927A (en) * 2015-11-17 2017-05-26 삼성디스플레이 주식회사 Backlight unit and display device having the same
KR20170127709A (en) * 2016-05-12 2017-11-22 엘지디스플레이 주식회사 Quantum dot sheet and backlight unit and display device using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150033142A (en) * 2013-09-23 2015-04-01 엘지디스플레이 주식회사 Backlight Unit and Display Device Using The Same
KR20150144847A (en) * 2014-06-17 2015-12-29 엘지디스플레이 주식회사 Backlight unit and display device having the same
KR20170057927A (en) * 2015-11-17 2017-05-26 삼성디스플레이 주식회사 Backlight unit and display device having the same
US10012785B2 (en) 2015-11-17 2018-07-03 Samsung Display Co., Ltd. Backlight unit and display device including the same
KR20170127709A (en) * 2016-05-12 2017-11-22 엘지디스플레이 주식회사 Quantum dot sheet and backlight unit and display device using the same

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