KR102020933B1 - Glass diffusion plate, backlight unit using the glass diffusion plate, and liquid crystal display using the backlight unit - Google Patents

Glass diffusion plate, backlight unit using the glass diffusion plate, and liquid crystal display using the backlight unit Download PDF

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Publication number
KR102020933B1
KR102020933B1 KR1020130074625A KR20130074625A KR102020933B1 KR 102020933 B1 KR102020933 B1 KR 102020933B1 KR 1020130074625 A KR1020130074625 A KR 1020130074625A KR 20130074625 A KR20130074625 A KR 20130074625A KR 102020933 B1 KR102020933 B1 KR 102020933B1
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South Korea
Prior art keywords
diffusion
light sources
pattern layer
glass
patterns
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KR1020130074625A
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Korean (ko)
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KR20150001420A (en
Inventor
박기덕
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엘지디스플레이 주식회사
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Priority to KR1020130074625A priority Critical patent/KR102020933B1/en
Publication of KR20150001420A publication Critical patent/KR20150001420A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting 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
    • G02B6/0033—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
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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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)
  • Liquid Crystal (AREA)

Abstract

The present invention relates to a glass diffusion plate, a backlight unit using the glass diffusion plate, and a liquid crystal display device using the backlight unit. Glass diffusion plate according to an embodiment of the present invention is a glass plate; And a diffusion pattern layer formed on the glass plate, wherein the diffusion pattern layer comprises: a first pattern layer printed on one surface of the glass plate; And a second pattern layer in which a plurality of diffusion patterns formed in a predetermined size on the first pattern layer are pattern printed.

Description

Glass diffuser, backlight unit using the glass diffuser, and liquid crystal display using the backlight unit {GLASS DIFFUSION PLATE, BACKLIGHT UNIT USING THE GLASS DIFFUSION PLATE, AND LIQUID CRYSTAL DISPLAY USING THE BACKLIGHT UNIT}

The present invention relates to a glass diffusion plate, a backlight unit using the glass diffusion plate, and a liquid crystal display device using the backlight unit.

BACKGROUND ART Liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Liquid crystal displays are widely used as portable computers such as notebook PCs, office automation equipment, audio / video equipment, indoor and outdoor advertising display devices, and the like. The LCD displays an image by controlling an electric field applied to the liquid crystal layer to modulate the light incident from the backlight unit.

The liquid crystal display device includes a liquid crystal display panel for displaying video data, and a back light unit for irradiating light to the liquid crystal display panel. The liquid crystal display panel and the backlight unit are assembled in a stacked state to form a liquid crystal module. The liquid crystal module further includes a guide / case member for fixing the liquid crystal display panel and the backlight unit, and a driving circuit board of the liquid crystal display panel.

The backlight unit is roughly divided into a direct type and an edge type. The direct type backlight unit has a structure in which a plurality of light sources are disposed under the liquid crystal display panel, and the edge type backlight unit has a light source disposed to face the side of the light guide plate, and a plurality of optical sheets are disposed between the liquid crystal display panel and the light guide plate. Has a structure.

1 is a cross-sectional view showing a liquid crystal module including a conventional direct type backlight unit. The direct type backlight unit has a structure in which a plurality of optical sheets 5 and a diffusion plate 4 are stacked below the liquid crystal display panel 6 and a plurality of light sources 1 are disposed below the diffusion plate 4. . The light sources 1 are mounted on a printed circuit board (hereinafter referred to as "PCB") 2. The reflector 3 may be formed on the PCB 2. Light generated from the light sources 1 is scattered and refracted through the diffusion plate 4 and the optical sheets 5 to spread to the front surface of the liquid crystal display panel 6.

Recently, the light source 1 of the backlight unit has been implemented as a light emitting diode (LED) package having advantages such as high efficiency, high brightness, and low power consumption. The optical gap G is defined as the distance between the LED package 1 (or reflector 3) and the diffuser plate 4 on which the light sources 1 are mounted. Similarly, if the optical angle G of the light spreading is narrow and the optical gap G of a constant height is not secured, there is a problem that luminance unbalance occurs. That is, when the optical gap G of a constant height is not secured as shown in FIG. 2, since the light from the LED package 1 does not touch a part of the diffuser plate 4, the bright spot where only the light hits the light appears bright. spot mura). In the case of the direct type backlight unit, it is difficult to reduce the thickness of the backlight unit because an optical gap G having a constant height must be secured.

In order to solve this problem, a light diffusing lens 10 is disposed on the LED package 1 as shown in FIG. 3 and can diffuse the light generated from the LED package 1 widely. When the light diffused from the light diffusing lenses 10 is incident on the diffuser plate 4, the light diffused through any one of the light diffusing lenses 10, as shown in FIG. 4A, causes the light diffusing lens 10 adjacent thereto. The light diffuses through and overlaps each other. However, even when the light diffusing lens 10 is used, when the optical gap G having a constant height is not secured as shown in FIG. 4B, when the light diffused from the light diffusing lenses 10 enters the diffuser plate 4. Light diffused through one light diffusing lens 10 hardly overlaps light diffused through the light diffusing lens 10 adjacent thereto. As a result, as shown in FIG. 5A, lattice mura may appear to be visible only at the overlapped portions of light. As a result, even if the direct type backlight unit uses the light diffusing lens 10, it is difficult to reduce the thickness of the backlight unit to some extent due to lattice failure.

The present invention provides a backlight unit capable of minimizing the thickness of a backlight unit without lattice defects and a liquid crystal display device including the same.

Glass diffusion plate according to an embodiment of the present invention is a glass plate; And a diffusion pattern layer formed on the glass plate, wherein the diffusion pattern layer comprises: a first pattern layer printed on one surface of the glass plate; And a second pattern layer in which a plurality of diffusion patterns formed in a predetermined size on the first pattern layer are pattern printed.

According to an embodiment of the present invention, a backlight unit may include light sources emitting light; A printed circuit board on which the light sources are mounted; A glass diffusion plate disposed on the light sources; And optical sheets disposed on the glass diffusion plate, wherein the glass diffusion plate comprises a glass plate and a diffusion pattern layer formed on the glass plate, wherein the diffusion pattern layer faces the glass sheet. A first pattern layer printed on one surface of the first pattern layer; And a second pattern layer in which a plurality of diffusion patterns formed in a predetermined size on the first pattern layer are pattern printed.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes: a liquid crystal display panel in which liquid crystal cells are arranged in a matrix by a cross structure of data lines and gate lines; A liquid crystal display panel driver configured to supply data voltages to the data lines to sequentially drive the liquid crystal cells, and sequentially supply gate pulses to the gate lines; And a backlight unit including light sources emitting light, a printed circuit board on which the light sources are mounted, a glass diffuser plate disposed on the light sources, and an optical sheet disposed on the glass diffuser plate. The plate includes a glass plate and a diffusion pattern layer formed on the glass plate, wherein the diffusion pattern layer comprises: a first pattern layer printed on one surface of the glass plate facing the optical sheets; And a second pattern layer in which a plurality of diffusion patterns formed in a predetermined size on the first pattern layer are pattern printed.

The present invention can diffuse light from the light sources using the diffusion pattern layer and the intaglio patterns even when the glass diffusion plate is in contact with or close to the light sources. As a result, the present invention can minimize the thickness of the backlight unit by reducing the optical gap and at the same time can uniformly diffuse the light from the light sources to provide light without lattice failure to the liquid crystal display panel.

1 is a cross-sectional view showing a liquid crystal module including a conventional direct type backlight unit.
FIG. 2 is an exemplary diagram illustrating an optical gap of FIG. 1. FIG.
Figure 3 is a cross-sectional view showing a liquid crystal module including another conventional direct type backlight unit.
4A and 4B illustrate an optical gap of FIG. 3.
5A and 5B are exemplary views illustrating a case where a lattice failure is shown and a case where a lattice failure is not shown.
6 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention.
FIG. 7 is an exploded perspective view showing the backlight unit of FIG. 6 in detail; FIG.
8 is a side view showing in detail the glass plate and the diffusion pattern layer of FIG.
9 is another side view showing in detail the glass plate and the diffusion pattern layer of FIG.
10 is a plan view showing in detail the light sources, the first pattern layer and the second pattern layer.
11 is a cross-sectional view illustrating a liquid crystal display device according to a second embodiment of the present invention.
FIG. 12 is an exploded perspective view showing the backlight unit of FIG. 11 in detail; FIG.
13 is a cross-sectional view illustrating a liquid crystal display device according to a third embodiment of the present invention.
FIG. 14 is an exploded perspective view showing the backlight unit of FIG. 13 in detail; FIG.
15 is an exemplary view showing in detail the back of the glass diffusion plate of FIG.
16 is a cross-sectional view illustrating a liquid crystal display device according to a fourth embodiment of the present invention.
FIG. 17 is an exploded perspective view showing the backlight unit of FIG. 16 in detail; FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements throughout. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Component names used in the following description are selected in consideration of ease of specification, and may be different from actual product names.

6 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention. FIG. 7 is an exploded perspective view illustrating the backlight unit of FIG. 6 in detail. 6 and 7, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal display panel 106, a driver for driving the liquid crystal display panel 106, a backlight unit, and a guide for supporting the backlight unit. / Case member or the like.

The liquid crystal display panel 106 includes a liquid crystal layer formed between two glass substrates. A plurality of data lines and a plurality of gate lines intersect the lower glass substrate 106b of the liquid crystal display panel 106. The liquid crystal cells are arranged in a matrix form on the liquid crystal display panel 106 by the intersection structure of the data lines and the gate lines. In addition, a thin film transistor (TFT), a pixel electrode of a liquid crystal cell connected to the TFT, and a storage capacitor are formed on the lower glass substrate 106b of the liquid crystal display panel 106. . The liquid crystal cells are driven by an electric field generated by the potential difference between the data voltage supplied to the pixel electrode through the data lines and the common voltage supplied to the common electrode to adjust the amount of light transmitted through the liquid crystal display panel 106.

A black matrix, a color filter, and a common electrode are formed on the upper glass substrate 106a of the liquid crystal display panel 106. The common electrode is formed on the upper glass substrate 106a in a vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode, and has an in plane switching (IPS) mode and a fringe field switching (FFS) mode. In the same horizontal electric field driving method, a pixel electrode is formed on the lower glass substrate 106b. On each of the upper glass substrate 106a and the lower glass substrate 106b of the liquid crystal display panel 106, a polarizing plate is attached and an alignment film for setting the pretilt angle of the liquid crystal is formed on the inner surface in contact with the liquid crystal.

Note that the driving unit of the liquid crystal display panel 106 is not shown for convenience of description. The driver of the liquid crystal display panel 106 includes a gate driver, a data driver, and a timing controller. The data driver is composed of a plurality of data drive integrated circuits. The data driver converts the digital video data into the positive / negative analog data voltage by using the positive / negative gamma compensation voltage under the control of the timing controller, and supplies the digital video data to the data lines. The gate driver sequentially outputs gate pulses (or scan pulses) to the gate lines under the control of the timing controller. The timing controller receives digital video data and timing signals input from a system board on which an external video source is mounted. The timing signals may include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, a dot clock signal, and the like. The timing controller generates timing control signals for controlling the operation timing of the data driver and the gate driver based on the digital video data and the timing signals. The timing controller outputs timing control signals to the data driver and the gate driver to control the timing of the data driver and the gate driver.

The backlight unit includes light sources 101, a printed circuit board 102, a reflective sheet 103, optical sheets 105, a glass diffusion plate 110, and the like. . The backlight unit according to the embodiment of the present invention is implemented as a direct backlight unit. That is, the backlight unit according to the embodiment of the present invention has a structure in which a plurality of optical sheets 105 are stacked below the liquid crystal display panel 106 and a plurality of light sources 101 are disposed under the optical sheets 105. Has

The light sources 101 may be implemented in a light emitting diode (LED) package having advantages such as high efficiency, high brightness, and low power consumption. The LED package may have a light emitting surface having a rectangular shape as shown in FIG. 10. The light sources 101 are turned on and off by receiving electrical signals from the light source driver through the PCB 102. The PCB 102 is formed with a circuit for electrically connecting the light sources 101 and the light source driver. PCB 102 may be formed of a metal PCB, in this case it may be made of aluminum to favor heat dissipation.

The reflective sheet 103 is formed on the PCB 102 and is formed in a region other than the region where the light sources 101 are formed. According to the first embodiment of the present invention, in order for the glass diffusion plate 110 to contact the light sources 101 and the reflective sheet 103 evenly, the height of the reflective sheet 103 may be equal to the height of each of the light sources 101. Form substantially the same. Accordingly, the reflective sheet 103 may include a plastic layer for matching the height of the reflective sheet 103 with the height of the light sources 101, and the plastic layer may be formed of polyethyleneterephthalate (PET).

The optical sheets 105 may include a diffusion sheet 105a, a lenticular film 105b, a prism sheet 105c, and a dual brightness enhancement film 105d. The diffusion sheet 105a diffuses incident light, and the lenticular film 105b and the prism sheet 105c collect incident light. The lenticular film 105b and the prism sheet 105c may be disposed such that the lenticular pattern of the lenticular film 105b and the prism pattern of the prism sheet 105c cross each other.

The glass diffusion plate 110 includes a glass plate 111 and a diffusion pattern layer 112. The glass plate 111 is in contact with the light sources 101 and the reflective sheet 103. The glass plate 111 corresponds to a base plate for patterning the diffusion pattern layer 112. Since the base plate in contact with the light sources 101 is in contact with the light sources 101, it is preferable that the base plate is formed of a heat resistant glass plate. This is because the heat generation amount of the LED package which is the light source 101 is high. For this reason, it is difficult to replace the glass plate 111 with plastics vulnerable to heat.

The diffusion pattern layer 112 is formed on the opposite side of the surface of the glass plate 111 in contact with the light sources 101. That is, the diffusion pattern layer 112 may be formed on the surface facing the optical sheets 105. The diffusion pattern layer 112 includes a first pattern layer 112a and a second pattern layer 112b as shown in FIGS. 8 and 9. A detailed description of the diffusion pattern layer 112 will be described later with reference to FIGS. 8 to 10.

The guide / case member includes a bottom cover 107, a guide panel 108, a case top 109, and the like. The bottom cover 107 is made of a metal of a rectangular frame to surround the side and bottom of the backlight unit. The bottom cover 107 is made of high strength steel sheet, for example, made of electro galvanized steel sheet (EGI), stainless steel (SUS), galvalume (SGLC), aluminum plated steel sheet (aka ALCOSTA), tin plated steel sheet (SPTE), etc. Can be.

The guide panel 108 surrounds the side surface of the liquid crystal display panel 106 and surrounds the side surface of the backlight unit, and includes a step surface facing the side surface of the liquid crystal display panel 106 and the backlight unit. The stepped portion of the guide panel 108 supports the display panel 106 from below and secures a panel gap between the display panel 106 and the optical sheets 105.

The case top 109 has a structure surrounding the top edge of the liquid crystal display panel 106, the top and side surfaces of the guide panel 108, and the side of the bottom cover 107. The case top 109 is fixed to at least one of the guide panel 108 and the bottom cover 107 by a hook or a screw.

FIG. 8 is a side view illustrating in detail the glass plate and the diffusion pattern layer of FIG. 7. Referring to FIG. 8, the diffusion pattern layer 112 includes a first pattern layer 112a and a second pattern layer 112b. The first pattern layer 112a is formed on one surface of the glass plate 111, and the second pattern layer 112b is formed on the first pattern layer 112a. For example, the first pattern layer 112a may be formed on a surface of the glass plate 111 facing the optical sheets 105.

Specifically, the first pattern layer 112a may be formed by completely printing an ink including a base solvent, SiO 2 , TiO 2 , and the like on one surface of the glass plate 111. Since the light intensity from the light sources 101 is high when the light sources 101 are implemented as LED packages, the light from the light sources 101 is blocked to some extent using the first pattern layer 112a. Lattice failure can be prevented as in 5a. The second pattern layer 112b may be formed by pattern printing an ink including a base solvent, SiO 2 , TiO 2, or the like on the first pattern layer 112a. It is preferable that a base solvent is a salt extraction solvent or a chlorine solvent. Since SiO 2 scatters light from the light sources 101, each of the first and second pattern layers 112a and 112b may diffuse light from the light sources 101. In addition, since TiO 2 reflects light incident through the liquid crystal display panel 106 from the outside, the diffusion pattern layer 112 may reflect light incident through the liquid crystal display panel 106 from the outside. The content of SiO 2 and TiO 2 contained in the ink is preferably 3% or less, but it should be noted that the present invention is not limited thereto. In other words, since the more the higher the content of the SiO 2 contained in the ink becomes larger the diffusion effect higher the content of TiO 2 contained in the ink becomes larger the reflection effect, the content of SiO 2 and TiO 2 is over a pre-experiment Considering this, Can be determined.

Meanwhile, the second pattern layer 112b may be formed by the following screen printing process. First, a mesh in which a plurality of patterns are patterned is disposed on the first pattern layer 112a. Then, an ink containing a base solvent, SiO 2 , TiO 2, or the like is applied onto the mesh. Then, when the ink applied on the mesh is pressed with a roller and squezzed, the pattern may be printed in the form of patterns patterned on the mesh.

FIG. 9 is another side view illustrating in detail a diffusion glass substrate and a diffusion pattern layer of FIG. 7. Referring to FIG. 9, the diffusion pattern layer 112 may further include a third diffusion pattern layer 112c in addition to the first pattern layer 112a and the second pattern layer 112b. The third diffusion pattern layer 112c may be formed on an opposite surface of one surface of the glass plate 111 on which the first pattern layer 112a is formed. For example, the third pattern layer 112c may be formed on a surface facing the light sources 101. Specifically, the third pattern layer 112c is formed by completely printing an ink including a base solvent, SiO 2 , TiO 2, and the like on the opposite side of one surface of the glass plate 111 on which the first pattern layer 112a is formed. Can be. When the diffusion pattern layer 112 further includes the third pattern layer 112c, light from the light sources 101 may be further blocked than otherwise.

10 is a plan view showing in detail the light sources, the first pattern layer and the second pattern layer. In FIG. 10, the light sources 101 are described as being implemented as an LED package having advantages such as high efficiency, high brightness, and low power consumption. The LED package may have a light emitting surface having a rectangular shape as shown in FIG. 10.

Referring to FIG. 10, the light sources 101 are spaced apart from each other by a predetermined interval. An ink containing a base solvent, SiO 2 , TiO 2, or the like is entirely printed on the first pattern layer 112a. Ink containing a base solvent, SiO 2 , TiO 2, or the like is pattern printed on the second pattern layer 112b. Therefore, the second pattern layer 112b is formed with a plurality of diffusion patterns p having a predetermined size. In FIG. 10, the diffusion patterns p have a circular shape, but the present disclosure is not limited thereto. That is, the diffusion patterns p may be formed in a rectangle, a pentagon, or the like.

In addition, the width of each of the diffusion patterns p may be larger than the width of each of the light sources 101. For example, as illustrated in FIG. 10, the width of each of the diffusion patterns p in the x-axis direction is greater than the width of the x-axis direction of each of the light sources 101 and the z-axis direction of each of the diffusion patterns p. The width of may be greater than the width in the z-axis direction of each of the light source (101).

Each of the diffusion patterns p includes a plurality of small patterns ps. In particular, the size of the small pattern ps formed at the center Cp of each of the diffusion patterns p is larger than the size of the small pattern ps formed at the edge of each of the diffusion patterns p. For example, as illustrated in FIG. 10, the small patterns ps formed in each of the diffusion patterns p may become smaller from the center Cp toward the edges. The larger the size of the small pattern ps, the greater the scattering effect of light.

In addition, the diffusion patterns p are formed at positions corresponding to the light sources 101. Specifically, the center Cl of each of the light sources 101 and the center Cp of each of the diffusion patterns p are located in a straight line in the vertical direction (y axis) with respect to the horizontal light emitting surface of the light sources 101. That is, the center Cl of each of the light sources 101 and the center Cp of each of the diffusion patterns p coincide with each other in the vertical direction (y axis) with respect to the horizontal light emitting surface of the light sources 101. As a result, light from the light sources 101 may be diffused by the diffusion patterns p.

Meanwhile, the light sources 101 emit light of maximum intensity in a vertical direction (y-axis) with respect to the horizontal light emitting surfaces of the light sources 101, and the light intensity increases as the angle increases with respect to the vertical direction (y-axis). It is weakened and emits light having an intensity of approximately 50% of the maximum intensity at a left and right azimuth angle of 60 degrees with respect to the vertical direction (y axis). The small pattern ps formed in the vertical direction (y-axis) with respect to the horizontal light emitting surface of the light source 101 corresponds to the small pattern ps formed in the center Cp of the diffusion pattern p. The small pattern ps formed at the left and right azimuth angles of 60 degrees with respect to the (y axis) corresponds to the small pattern ps formed at the edge of the diffusion pattern p. As a result, in the first embodiment of the present invention, since the light having the maximum intensity is incident in the vertical direction (y-axis) with respect to the horizontal light emitting surfaces of the light sources 101, the small pattern is formed at the center Cp of the diffusion pattern p. (ps) is the largest size to increase the light scattering effect.

As described above, the first embodiment of the present invention diffuses the light from the light sources 101 by using the glass diffusion plate 110 in contact with the light sources 101. As a result, according to the first embodiment of the present invention, even when the optical gap is reduced to minimize the thickness of the backlight unit, as shown in FIG. ) Can be provided.

11 is a cross-sectional view illustrating a liquid crystal display according to a second exemplary embodiment of the present invention. FIG. 12 is an exploded perspective view illustrating the backlight unit of FIG. 11 in detail. 11 and 12, a liquid crystal display according to a second exemplary embodiment of the present invention includes a liquid crystal display panel 106, a driver for driving the liquid crystal display panel 106, a backlight unit, and a guide for supporting the backlight unit. / Case member or the like.

The liquid crystal display according to the second exemplary embodiment of the present invention is except that the backlight unit further includes a diffusion plate 104 disposed between the glass diffusion plate 110 and the optical sheets 105. It is substantially the same as the first embodiment of the present invention described in conjunction with 7. Therefore, detailed descriptions of the liquid crystal display panel 106, the driving unit of the liquid crystal display panel 106, the backlight unit, and the guide / case member of the liquid crystal display device according to the second exemplary embodiment will be omitted. Hereinafter, the diffusion plate 104 of the backlight unit according to the second embodiment of the present invention will be described in detail.

11 and 12, the diffusion plate 104 diffuses the light emitted from the glass diffusion plate 110. To this end, the diffusion plate 104 may be formed of plastic, and may include beads. The second embodiment of the present invention can diffuse the light from the light sources 101 more uniformly due to the addition of the diffusion plate 104. As a result, the second embodiment of the present invention can provide light to the liquid crystal display panel 106 without lattice defects by spreading the light from the light sources 101 more uniformly than the first embodiment of the present invention.

13 is a cross-sectional view illustrating a liquid crystal display device according to a third embodiment of the present invention. FIG. 14 is an exploded perspective view illustrating the backlight unit of FIG. 13 in detail. 13 and 14, a liquid crystal display according to a third exemplary embodiment of the present invention may include a liquid crystal display panel 106, a driver for driving the liquid crystal display panel 106, a backlight unit, and a guide for supporting the backlight unit. / Case member or the like.

The liquid crystal display according to the third exemplary embodiment of the present invention is substantially the same as the first exemplary embodiment described with reference to FIGS. 6 and 7 except for the glass diffusion plate 110 and the reflective sheet 103 of the backlight unit. Same as Therefore, detailed descriptions of the liquid crystal display panel 106, the driver of the liquid crystal display panel 106, the backlight unit, and the guide / case member of the liquid crystal display device according to the third exemplary embodiment will be omitted. Hereinafter, the glass diffusion plate 110 and the reflective sheet 103 of the backlight unit according to the third embodiment of the present invention will be described in detail.

FIG. 15 is an exemplary view showing in detail a rear surface of the glass diffusion plate of FIG. 13. Referring to FIG. 15, intaglio patterns pi are formed on one surface of the glass plate 111 facing the light sources 101 in the third embodiment of the present invention. The intaglio patterns pi may be patterned in hemispherical or oval hemispherical form as shown in FIG. 15. The intaglio patterns pi may be formed by pressing one surface of the glass plate 111 with a mold in which a hemispherical shape or an oval hemispherical shape is embossed at the time of manufacturing the glass plate 111.

The width of each of the intaglio patterns pi may be greater than the width of each of the light sources 101. As shown in FIG. 13, the width in the x-axis direction of each of the intaglio patterns pi is greater than the width in the x-axis direction of each of the light sources 101, and the width in the z-axis direction of each of the intaglio patterns pi is the light source 101. ) May be larger than the width in each of the z-axis directions. For example, the width in the x-axis direction and the width in the z-axis direction of each of the intaglio patterns pi are 1.2 times or more than twice the width in the x-axis direction and the width in the z-axis direction of each of the light sources 101. It can be largely implemented as follows. In addition, as shown in FIG. 13, the height of each of the intaglio patterns pi may be greater than the height of each of the light sources 101. For example, the height of each of the intaglio patterns pi may be implemented to be 1.2 times or more and 1.5 times or less than the height of each of the light sources 101. However, the size of the intaglio pattern pi according to an embodiment of the present invention may vary depending on the size of each of the light sources 101, the spacing between the light sources 101, the thickness of the glass plate 111, and the like. Can be predetermined.

The intaglio patterns pi are formed at positions corresponding to the light sources 101. In detail, the center of each of the light sources 101 and the center of each of the intaglio patterns pi are positioned in a straight line in the vertical direction (y-axis) with respect to the horizontal light emitting surface of the light sources 101. That is, the center of each of the light sources 101 and the center of each of the intaglio patterns pi coincide with each other in the vertical direction (y axis) with respect to the horizontal light emitting surface of the light sources 101. Thus, the intaglio patterns pi can serve as diffusion lenses. That is, light from each of the light sources 101 may be refracted and diffused by the intaglio pattern pi.

As a result, according to the third embodiment of the present invention, by forming the intaglio patterns pi on one surface of the glass plate 111, the light from the light sources 101 may be more uniformly diffused. As a result, the third embodiment of the present invention can provide light to the liquid crystal display panel 106 without lattice defects by spreading the light from the light sources 101 more uniformly than the first embodiment of the present invention.

Meanwhile, in the third exemplary embodiment of the present invention, since the intaglio patterns pi are formed at positions of the glass plates 111 corresponding to the light sources 101, the height of the reflective sheet 103 is increased by the height of each of the light sources 101. There is no need to form the same as. Accordingly, the reflective sheet 103 does not have to include a plastic layer for matching the height of the reflective sheet 103 with the height of the light sources 101. In this case, in the third embodiment of the present invention, the glass plate 111 is in contact with the reflective sheet 103 as shown in FIGS. 13 and 14.

16 is a cross-sectional view illustrating a liquid crystal display device according to a fourth embodiment of the present invention. 17 is an exploded perspective view illustrating the backlight unit of FIG. 16 in detail. 16 and 17, a liquid crystal display according to a fourth exemplary embodiment of the present invention includes a liquid crystal display panel 106, a driver for driving the liquid crystal display panel 106, a backlight unit, and a guide for supporting the backlight unit. / Case member or the like.

The liquid crystal display according to the fourth exemplary embodiment of the present invention is except that the backlight unit further includes a diffuser plate 104 disposed between the glass diffuser plate 110 and the optical sheets 105. It is substantially the same as the third embodiment of the present invention described with reference to 16. Therefore, detailed descriptions of the liquid crystal display panel 106, the driver of the liquid crystal display panel 106, the backlight unit, and the guide / case member of the liquid crystal display device according to the fourth exemplary embodiment will be omitted. Hereinafter, the diffusion plate 104 of the backlight unit according to the fourth embodiment of the present invention will be described in detail.

16 and 17, the diffusion plate 104 diffuses the light emitted from the glass diffusion plate 110. To this end, the diffusion plate 104 may be formed of plastic, and may include beads. The fourth embodiment of the present invention can diffuse the light from the light sources 101 more uniformly due to the addition of the diffusion plate 104. As a result, the fourth embodiment of the present invention can provide light to the liquid crystal display panel 106 without lattice defects by diffusing the light from the light sources 101 more uniformly than the third embodiment of the present invention.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1, 101: LED package 2, 102: PCB
3, 103: reflection sheet 4, 104: diffusion plate
5, 105: optical sheets 6, 106: display panel
6a, 106a: upper glass substrate 6b, 106b: lower glass substrate
7, 107: bottom cover 8, 108: guide panel
9, 109: case top 110: glass diffusion plate
111: glass plate 112: diffusion pattern layer
G: optical gap

Claims (19)

Glass plate; And
A diffusion pattern layer formed on the glass plate,
The diffusion pattern layer,
A first pattern layer printed on the entire surface of the glass plate; And
A plurality of diffusion patterns formed in a predetermined size on the first pattern layer comprises a pattern-printed second pattern layer,
Each of the diffusion patterns includes a plurality of small patterns,
And the size of the small pattern formed at the center of each of the diffusion patterns is larger than the size of the pattern formed at the edge of each of the diffusion patterns. delete The method of claim 1,
The diffusion pattern layer,
The glass diffusion plate further comprises a third pattern layer formed on the entire opposite surface of one surface of the glass plate on which the first pattern layer is formed. The method of claim 3, wherein
The first to third pattern layers are glass diffusion plate, characterized in that containing a chlorine solvent or salt-based solvent, SiO 2 and TiO 2 . The method of claim 1,
The intaglio pattern is formed on an opposite surface of one surface of the glass plate on which the first pattern layer is formed. Light sources emitting light;
A printed circuit board on which the light sources are mounted;
A glass diffusion plate disposed on the light sources; And
Optical sheets disposed on the glass diffusion plate,
The glass diffusion plate includes a glass plate and a diffusion pattern layer formed on the glass plate,
The diffusion pattern layer,
A first pattern layer printed on one surface of the glass plate facing the optical sheets; And
A plurality of diffusion patterns formed in a predetermined size on the first pattern layer comprises a pattern-printed second pattern layer,
Each of the diffusion patterns includes a plurality of small patterns,
And the size of the small pattern formed at the center of each of the diffusion patterns is larger than the size of the pattern formed at the edge of each of the diffusion patterns. delete The method of claim 6,
And each of the diffusion patterns is formed at a position corresponding to each of the light sources. The method of claim 8,
And a center of each of the light sources and a center of each of the diffusion patterns coincide with each other in a direction perpendicular to the horizontal light emitting surface of the light sources. The method of claim 6,
The diffusion pattern layer,
The backlight unit further comprises a third pattern layer printed on the opposite side of the one surface of the glass plate. The method of claim 10,
The first to the third pattern layer is a backlight unit, characterized in that containing a chlorine solvent or salt-based solvent, SiO 2 and TiO 2 . The method of claim 10,
And a reflective sheet attached to an area of the printed circuit board except for an area in which the light sources are mounted.
The height of the reflective sheet is the same as the height of each of the light sources,
And the light sources and the reflective sheet contact the third pattern layer. The method of claim 6,
Intaglio patterns are formed on an opposite surface of one surface of the glass plate, and each of the intaglio patterns is formed at a position corresponding to each of the light sources. The method of claim 13,
And a center of each of the light sources and a center of each of the intaglio patterns in a direction perpendicular to the horizontal light emitting surface of the light sources coincide with each other. The method of claim 13,
The width of each of the intaglio patterns is greater than the width of each of the light sources, the height of each of the intaglio patterns is higher than the height of each of the light sources. The method of claim 6,
And a reflective sheet attached to an area of the printed circuit board except for an area in which the light sources are mounted.
The height of the reflective sheet is the same as the height of each of the light sources,
And the light sources and the reflective sheet are in contact with the glass plate. The method of claim 6,
And a reflective sheet attached to an area of the printed circuit board except for an area in which the light sources are mounted.
The height of the reflective sheet is lower than the height of each of the light sources, the reflective sheet is in contact with the glass plate. The method of claim 6,
And a diffuser plate disposed between the glass diffuser plate and the optical sheets and formed of plastic. A liquid crystal display panel in which liquid crystal cells are arranged in a matrix by a cross structure of data lines and gate lines;
A liquid crystal display panel driver configured to supply data voltages to the data lines to sequentially drive the liquid crystal cells, and sequentially supply gate pulses to the gate lines; And
A backlight unit including light sources for emitting light, a printed circuit board on which the light sources are mounted, a glass diffuser plate disposed on the light sources, and an optical sheet disposed on the glass diffuser plate,
The glass diffusion plate includes a glass plate and a diffusion pattern layer formed on the glass plate,
The diffusion pattern layer,
A first pattern layer printed on one surface of the glass plate facing the optical sheets; And
A plurality of diffusion patterns formed in a predetermined size on the first pattern layer comprises a pattern-printed second pattern layer,
Each of the diffusion patterns includes a plurality of small patterns,
And the size of the small pattern formed at the center of each of the diffusion patterns is larger than the size of the pattern formed at each edge of each of the diffusion patterns.
KR1020130074625A 2013-06-27 2013-06-27 Glass diffusion plate, backlight unit using the glass diffusion plate, and liquid crystal display using the backlight unit KR102020933B1 (en)

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