KR20090019208A - Backlight unit for flat panel display device - Google Patents

Backlight unit for flat panel display device Download PDF

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Publication number
KR20090019208A
KR20090019208A KR1020070083465A KR20070083465A KR20090019208A KR 20090019208 A KR20090019208 A KR 20090019208A KR 1020070083465 A KR1020070083465 A KR 1020070083465A KR 20070083465 A KR20070083465 A KR 20070083465A KR 20090019208 A KR20090019208 A KR 20090019208A
Authority
KR
South Korea
Prior art keywords
plate
light guide
guide plate
backlight unit
light
Prior art date
Application number
KR1020070083465A
Other languages
Korean (ko)
Inventor
박재현
Original Assignee
엘지디스플레이 주식회사
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 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020070083465A priority Critical patent/KR20090019208A/en
Publication of KR20090019208A publication Critical patent/KR20090019208A/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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours

Abstract

A backlight unit for a flat panel display device is provided to enhance display quality by improving a color breakup phenomenon generated in the backlight unit using an LED. A plurality of LEDs(122) are mounted on an LED array. A light guide plate(140) is adjacent to the LED array. A reflective plate(130) is positioned in a lower part of the light guide plate. A diffusion pattern plate(160) is comprised in the light guide plate or the reflective plate and includes a plurality of diffusion beads. A lamp housing(110) receives an LED array and couples the light guide plate and the reflective plate. A plurality of optical sheets(152,154) are comprised in an upper part of the light guide plate.

Description

Backlight unit for flat panel display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit of a flat panel display device, and more particularly, to a backlight unit of a flat panel display device having improved color mixing characteristics and color separation of light emitted from the LED in a backlight unit using an LED as a light source.

Liquid crystal display (hereinafter referred to as "LCD") is a plurality of liquid crystal cells arranged in a matrix form and for supplying the image data for controlling the light transmittance by controlling the rotation angle of the liquid crystal to each of these liquid crystal cells A desired image is displayed on a screen by transmitting light supplied from a backlight unit to a liquid crystal panel provided with a TFT (thin film transistor).

As a light source used in such a backlight unit, a cold cathode fluorescent lamp (hereinafter referred to as 'CCFL') is mainly used. Such a backlight unit has a trend of miniaturization, thinning, and weight reduction. According to this trend, a light emitting diode (LED), which is advantageous in terms of power consumption, weight, and brightness, has been newly proposed instead of the CCFL used in the backlight unit.

1 is a cross-sectional structural view for explaining the configuration of a backlight unit 1 using an LED as a light source, and includes a lamp housing 10, an LED array 20 including a LED 22, a reflecting plate 30, and a light guide plate ( 40), and a plurality of optical sheets 52, 54.

The lamp housing 10 serves to fix the LED array 20 and to bind and fix the ends of the reflective plate 30 and the light guide plate 40 to the light guide plate 40. It serves to condense to the side.

The LED array 20 is a kind of package in which a plurality of light emitting diodes (LEDs) are mounted on a substrate 21, and light of red (R) color, green (G) color, and blue (B) color The LED 22 which emits light is mounted in a predetermined arrangement.

2A and 2B are diagrams for explaining the structure of the LED array 20 in more detail, respectively, a conventional LED array (or sometimes referred to as an 'LED package') 20 is R, G, B color A plurality of packages may be mounted on one array substrate using the LEDs 22a, 22b, and 22c as one package unit, and in order to increase the light utilization efficiency of the LED, the reflective wall 25 in each package unit as shown in FIG. Alternatively, as shown in FIG. 2B, a reflective wall 25 may be installed for each LED.

The reflector 30 reflects the light emitted from the LED 22 toward the light guide plate 40, and reflects the light that passes downward through the light guide plate 40 back to the light guide plate 40. It serves to condense light with a display panel (not shown) positioned on the optical sheets 52 and 54.

The light guide plate 40 converts the light emitted from the LED 22 into a surface light source having a uniform brightness, and emits the light to the display panel positioned on the optical sheets 52 and 54.

The plurality of optical sheets 52 and 54 may be classified into a prism sheet 52 and a diffusion sheet 54, and the prism sheet 52 may emit light incident from the light guide plate 40 vertically. A plurality of prism patterns (the prism pattern is formed on the bottom surface of the prism sheet 52 in the drawing) are formed on the surface thereof, and the diffusion sheet 54 is a display in which light incident from the prism sheet 52 is located thereon. Diffuse light uniformly through the panel.

However, in the backlight unit 1 having the above-described configuration, before the light emitted from the LED 22 is mixed with each other, there is an area displaying each color as it is in a predetermined area. This is called.

FIG. 3 is a view for explaining a color separation phenomenon in a backlight unit using an LED, and shows a mixed color region A of light emitted from the RGB color LEDs 22a, 22b, and 22c.

Light emitted from each of the RGB color LEDs 22a, 22b, and 22c is propagated as it enters the light guide plate 40. Before the light of the light guide plate 40 shows a mixed color region A, each light is mixed. In this section, color separation regions B R , B G , and B B are created. This color separation area is formed on the reflector (30 in FIG. 1) to make the light aggregation area recognized more brightly than the surroundings, thereby causing unnatural screen display.

An object of the present invention is to provide a backlight unit for a display device that can provide a high-quality display quality by improving the color separation phenomenon generated in the backlight unit using the LED as described above.

The present invention to achieve the above object, a plurality of LED mounted LED array; A light guide plate configured to be adjacent to the LED array; A reflection plate formed under the light guide plate; A diffusion pattern plate formed on the light guide plate or the reflection plate and including a plurality of diffusion beads; A lamp housing which adsorbs the LED array and binds an end portion of the light guide plate and the reflection plate; A backlight unit for a flat panel display device including a plurality of optical sheets disposed on the light guide plate is provided.

The diffusion pattern plate is characterized in that the incident light is diffused to distribute the elliptical.

The diffusion pattern plate may be configured on a lower surface of the light guide plate or on one or more of upper and lower surfaces of the reflective plate.

The diffusion pattern plate may be partially configured only in an area adjacent to the LED array in the light guide plate or the reflection plate.

The plurality of diffusion beads is characterized in that the glass or synthetic resin of the particulate form.

The diffusion pattern plate is characterized in that the resin or film which extends in one direction after distributing the plurality of diffusion beads in the resin composition.

The plurality of optical sheets may include a prism sheet and a diffusion sheet.

According to the present invention, the color separation phenomenon of the light emitted from the LED is improved in the flat panel display device using the LED as a light source, so that there is no light aggregation region where a specific region appears brighter than the surroundings, thereby improving display quality.

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

First Embodiment

FIG. 4 is a cross-sectional view for explaining a configuration feature of the backlight unit 100 for a flat panel display device according to the first embodiment of the present invention, and includes a lamp housing 110 and a plurality of LEDs 122 mounted thereon. The array 120, the reflecting plate 130, the light guide plate 140, the plurality of optical sheets 152 and 154, and the diffusion pattern plate 160 may be formed.

The lamp housing 110 attaches the light emitted from the LED 122 to the LED array 120 and binds and fixes the ends of the reflective plate 130 and the light guide plate 140 to the light guide plate 140. It serves to condense to the side.

The LED array 120 is a kind of package in which a plurality of light emitting diodes (LEDs) are mounted on a substrate 121 and emits light of red (R) color, green (G) color, and blue (B) color. LED 122 is mounted with a predetermined arrangement.

The reflector 130 reflects the light emitted from the LED 122 toward the light guide plate 140, and reflects the light that passes downward through the light guide plate 140 back to the light guide plate 140. The display panel (not shown) positioned above the optical sheets 152 and 154 serves to condense light.

The light guide plate 140 is positioned adjacent to the LED array 120, and converts the light emitted from the LED 122 into a surface light source having a uniform luminance, and is positioned on the optical sheets 152 and 154. Play a role of exit.

The plurality of optical sheets 152 and 154 may be classified into a prism sheet 152 and a diffusion sheet 154. The prism sheet 152 may emit light incident from the light guide plate 140 vertically. A plurality of prism patterns (the prism pattern is formed on the bottom surface of the prism sheet 152 in the drawing) are formed on the surface thereof, and the diffusion sheet 154 is a display in which light incident from the prism sheet 152 is positioned at the top. Diffuse light uniformly through the panel.

The diffusion pattern plate 160 is formed on the bottom surface of the light guide plate 140, and is particularly configured to be close to the first entrance portion where light is incident from the LED 122.

The diffusion pattern plate 160 is configured at a position corresponding to the color separation region indicated before the LEDs 122 are mixed, and has the purpose of diffusing and dispersing the emitted light that is not mixed. The diffusion pattern plate 160 is sprayed with a plurality of fine particles (Beed) made of glass, silicon or synthetic resin material in the resin composition and then stretched the resin composition in a specific direction when the plurality of beads are rearranged and incident light A specific pattern capable of diffusing is formed, and the incident light diffused by the specific pattern generally has an ellipse shape. In addition, the beads are commonly referred to as 'diffusion beads'.

FIG. 5 is a view for explaining a diffusion pattern of incident light performed by the diffusion pattern plate 160. The light incident on the diffusion pattern plate 160 of FIG. 4 is formed by rearranging a plurality of diffusion beads. By showing an elliptic diffusion pattern.

As described above, the diffusion pattern plate 160 forming an elliptic diffusion pattern with respect to the incident light may have a long axis direction of the ellipse shape parallel to a direction in which the plurality of LEDs 122 are arranged, that is, the LEDs 122 may have the same shape. The diffusion pattern plate 160 may be configured such that the long axis of the elliptic pattern is positioned in a direction perpendicular to the direction connecting the light guide plate 140.

The diffusion pattern plate 160 having the above characteristics is formed on the bottom surface of the light guide plate 140, particularly in the first entrance portion closest to the LED 122, which is an area where the light emitted from the LED 122 is not mixed and mixed. In this case, since the aggregated light is diffused in the elliptic pattern by the diffusion pattern plate 160 and transmitted to the reflector plate 130, the display quality can be improved by reducing the light aggregation phenomenon in the color separation region.

Second Embodiment

FIG. 6 is a cross-sectional view illustrating a configuration feature of the backlight unit 200 for a flat panel display device according to the second embodiment of the present invention. The lamp housing 210 and the LEDs 222 are mounted thereon. The array 220, the reflective plate 230, the light guide plate 240, the plurality of optical sheets 252 and 254, and the diffusion pattern plate 260 are formed. Since the features of each configuration are substantially the same as those of the first embodiment described above, only the configuration of the diffusion pattern plate 260 will be described.

In the second embodiment of the present invention, the diffusion pattern plate 260 is configured on the upper surface of the reflecting plate 230, and since the reflection of the light through the reflecting plate 230 is not 100% performed, The diffusion pattern plate 260 may be formed on the bottom surface of the reflecting plate 230.

In addition, the diffusion pattern plate 260 which forms an elliptic diffusion pattern with respect to incident light has a long axis direction of the ellipse shape parallel to a direction in which the plurality of LEDs 222 are arranged, that is, in the LEDs 222. The diffusion pattern plate 260 may be configured such that the long axis of the elliptic pattern is positioned in a direction perpendicular to the direction connecting the light guide plate 240.

When the light emitted from the LED 222 is configured at the inlet of the reflector 230 closest to the LED 222 forming a region in which the light emitted from the LED 222 is not mixed, the light emitted from the LED 222 is The diffusion pattern plate 260 diffuses into an ellipse pattern, thereby reducing display aggregation in the color separation region, thereby improving display quality.

Third Embodiment

FIG. 7 is a cross-sectional view illustrating a configuration feature of the backlight unit 300 for a flat panel display device according to the third embodiment of the present invention. The lamp housing 310 and the LEDs 322 are mounted thereon. An array 320, a reflecting plate 330, a light guide plate 340, a plurality of optical sheets 352 and 354, and a plurality of diffusion pattern plates 362 and 364. Since the features of each configuration are substantially the same as those of the first embodiment described above, only the configuration features of the plurality of diffusion pattern plates 362 and 364 will be described.

In the third embodiment of the present invention, the diffusion pattern plates 362 and 364 are formed on the upper and lower surfaces of the reflecting plate 330 respectively corresponding to the region where the light aggregation occurs due to the color separation phenomenon of the LED 322. Is characteristic. In this case, since the reflection of the light through the reflector 230 is not 100%, the diffusion pattern plate 364 is further formed on the lower surface of the reflector 330, so that the light transmitted through the reflector 330 is also transmitted. It is characterized by providing a diffusion effect of the aggregated light.

In addition, each of the diffusion pattern plates 362 and 364 forming an elliptic diffusion pattern has a long axis direction of the ellipse shape parallel to a direction in which the plurality of LEDs 322 are arranged, that is, in the LEDs 322. The long axis of the elliptic pattern may be positioned in a direction perpendicular to the direction connecting the light guide plate 340, and the long axes of the elliptic patterns formed by the diffusion pattern plates 362 and 364 may cross each other. It may be configured.

The diffusion pattern plates 362 and 364 may be formed on the upper and lower surfaces of the first inlet of the reflecting plate 330 closest to the LED 322, which forms an area in which the light emitted from the LED 322 is agglomerated without mixing. When the light emitted from the LED 322 is first diffused in an elliptic pattern by the upper diffusion pattern plate 362, and then passes through the reflecting plate 360, and then again by the lower diffusion pattern plate 364. Further diffusion is performed to be transmitted to the light guide plate 340, thereby reducing the light aggregation phenomenon in the color separation region of the LED 322 to provide an improved display quality.

The backlight unit for a flat panel display device according to the present invention as described above is not limited to the first to third embodiments, but can be applied in various ways. For example, only the bottom surface of the reflective plate constitutes a diffusion pattern plate or The diffusion pattern plate may be configured on both the light guide plate and the reflecting plate. In addition, the diffusion pattern plate may be configured on the upper surface or the lower surface of the reflecting plate to cover the front surface of the reflecting plate. Therefore, the selection of the configuration may be variously performed according to the application of the designer.

1 is a cross-sectional structure diagram for explaining the configuration of a backlight unit 1 using LED as a light source.

2A and 2B are views for explaining the structure of the LED array 20 in more detail, respectively.

3 is a view for explaining the 'color separation area' phenomenon in the backlight unit using the LED

4 is a cross-sectional view illustrating a configuration feature of the backlight unit 100 for a flat panel display device according to the first embodiment of the present invention.

5 is a view for explaining a diffusion pattern of incident light performed by the diffusion pattern plate 160.

6 is a cross-sectional view illustrating a configuration feature of a backlight unit 200 for a flat panel display device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a configuration feature of a backlight unit 300 for a flat panel display device according to a third embodiment of the present invention.

<Brief description of the main parts of the drawing>

10: lamp housing 20: LED array

21: substrate 22: LED

30: reflector 40: light guide plate

52, 54: optical sheet

Claims (7)

An LED array having a plurality of LEDs mounted thereon; A light guide plate configured to be adjacent to the LED array; A reflection plate formed under the light guide plate; A diffusion pattern plate formed on the light guide plate or the reflection plate and including a plurality of diffusion beads; A lamp housing which adsorbs the LED array and binds an end portion of the light guide plate and the reflection plate; A plurality of optical sheets configured on the light guide plate Backlight unit for a flat panel display device comprising a The method according to claim 1, The diffusion pattern plate is a backlight unit for a flat panel display device characterized in that the incident light is diffused to distribute the The method according to claim 1, The diffusion pattern plate may be formed on a lower surface of the light guide plate or on one or more of upper and lower surfaces of the reflective plate. The method according to claim 1, The diffusion pattern plate may be partially configured only in an area adjacent to the LED array in the light guide plate or the reflection plate. The method according to claim 1, The plurality of diffusion beads is a backlight unit for a flat panel display device, characterized in that the particulate glass or synthetic resin The method according to claim 1, The diffusion pattern plate is a backlight unit for a flat panel display device, characterized in that the resin or film is extended in one direction after distributing the plurality of diffusion beads in a resin composition. The method according to claim 1, The plurality of optical sheets include a prism sheet and a diffusion sheet, the backlight unit for a flat panel display device
KR1020070083465A 2007-08-20 2007-08-20 Backlight unit for flat panel display device KR20090019208A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070083465A KR20090019208A (en) 2007-08-20 2007-08-20 Backlight unit for flat panel display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070083465A KR20090019208A (en) 2007-08-20 2007-08-20 Backlight unit for flat panel display device

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KR20090019208A true KR20090019208A (en) 2009-02-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120126608A (en) * 2011-05-12 2012-11-21 삼성디스플레이 주식회사 Backlight assembly and display apparatus having the same
US8400582B2 (en) 2009-09-29 2013-03-19 Lg Display Co., Ltd. Liquid crystal display device and backlight unit
US8662729B2 (en) 2009-07-28 2014-03-04 Lg Innotek Co., Ltd. Light unit and display apparatus having the same
US9069110B2 (en) 2009-07-31 2015-06-30 Lg Innotek Co., Ltd. Backlight unit and display device
US9575362B2 (en) 2013-12-06 2017-02-21 Samsung Display Co., Ltd. Backlight assembly comprising a plurality of first and second color patterns and display device including the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8662729B2 (en) 2009-07-28 2014-03-04 Lg Innotek Co., Ltd. Light unit and display apparatus having the same
US9069110B2 (en) 2009-07-31 2015-06-30 Lg Innotek Co., Ltd. Backlight unit and display device
US8400582B2 (en) 2009-09-29 2013-03-19 Lg Display Co., Ltd. Liquid crystal display device and backlight unit
KR20120126608A (en) * 2011-05-12 2012-11-21 삼성디스플레이 주식회사 Backlight assembly and display apparatus having the same
US9575362B2 (en) 2013-12-06 2017-02-21 Samsung Display Co., Ltd. Backlight assembly comprising a plurality of first and second color patterns and display device including the same

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