TWI359998B - Backlight for liquid crystal display using light e - Google Patents

Backlight for liquid crystal display using light e Download PDF

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Publication number
TWI359998B
TWI359998B TW096112435A TW96112435A TWI359998B TW I359998 B TWI359998 B TW I359998B TW 096112435 A TW096112435 A TW 096112435A TW 96112435 A TW96112435 A TW 96112435A TW I359998 B TWI359998 B TW I359998B
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Taiwan
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circuit board
double
printed circuit
light
sided printed
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TW096112435A
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English (en)
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TW200801726A (en
Inventor
Chul Hee Yoo
Hyun Ho Lee
Yoon Tak Yang
Myoung Bo Park
Sang Yun Lee
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Samsung Led Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
    • H05K1/0203—Cooling of mounted components
    • H05K1/0204—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate
    • H05K1/0206—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate by printed thermal vias
    • 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
    • G02F1/133601—Illuminating devices for spatial active dimming
    • 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
    • G02F1/133628—Illuminating devices with cooling means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09218—Conductive traces
    • H05K2201/09227—Layout details of a plurality of traces, e.g. escape layout for Ball Grid Array [BGA] mounting
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
    • H05K2201/09972—Partitioned, e.g. portions of a PCB dedicated to different functions; Boundary lines therefore; Portions of a PCB being processed separately or differently
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10106—Light emitting diode [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10189—Non-printed connector
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10431—Details of mounted components
    • H05K2201/10439—Position of a single component
    • H05K2201/10446—Mounted on an edge

Description

ΙΪ59998 η …九、發明說明： > [優先權之主張] 本申請案主張於2006年4月14日向韓國智慧財產局 所提出申請之韓國專利申請案第2006-34131號之優先 權，該韓國專利申請案揭示之内容併入本案作為參考。 ' 【發明所屬之技術領域】 - 本發明係關於一種用於使用發光二極體之液晶顯示器 (LCD)的背光，且尤其地，是關於一種使用發光二極體的 •液晶顯示器背光單元，其沒有發生在液晶顯示器面板之區 域内的黑暗的問題，該液晶顯示器面板的區域是對應於裝 設在該背光單元内的連接器，以與複數個獨立驅動的發光 二極體模組電性連接，以便達成局部暗淡（local dimming) 的目的。 【先前技術】 冷陰極螢光燈（Cold Cathode Fluorescent Lamp; CCFL) 鲁用在液晶顯示器（LCD)背光作為光源已有一段時間了。因 為使用了水銀氣體，CCFL很可能會造成環境污染。同時， CCFL有著低的反應率和色彩再現性，並不足以降低1^0〇 * 面板的重量以及尺寸。 • 相對地，發光二極體（light emitting diode ; LED)不會
造成環境污染，並且能於數奈秒内快速反應，因此在影像 訊號流上相當的有效。尤其地，LED可以脈衝來驅動、 具有100%或更高的色彩再現率，並且可藉由調整紅、綠 和藍LED光量而可以任意地改變亮度以及色溫。同時，LED 5 93916 1359998 具有將LCD面板導向更輕以及較小尺寸的優點。所以， ν LED積極地被採用作為乙(：1)面板的背光源。 一般而言，使用LED之LCD背光依照光源的位置而 包括了一種側邊式（edge_type)背光和一種直下式 .(direct-ty^e)背光。在前者中，光源是形如一長條的棒體， 並置放在導光板的一側，以將光照射在LCD面板上。至於 •在後者中，表面光源實質上具有和LCD面板相同的尺寸， 鲁亚且是置放在LCD面板的下方，以直接地將光照射在lcd 面板。尤其地，直下式背光單元係直接地由LCd面板的下 方恥射光。這可讓光以不同的亮度照射在LCD面板的某一 部份，因此達成了局部暗淡的目的。” /以此種局部暗淡的特性，可對將在LCD面板上播放的 影像訊號加以分析，以找出需要調亮或調暗的區域，而背 光之對應區域的亮度則是依此分析來加以控制。因此，此 種技術給予了透過LCD面板減之影像更鮮明的特色。例 在爆炸的影像中，置放在播放是項爆炸之咖面板區 域下方的背光源的亮度可藉由局部 確保景像的生動以及鮮明。 口此了以 第la圖是顯示用於局部暗淡的傳統lcd背光之平 =第ib圖疋顯不該LCD背光沿著”，線切割的部分 :圖。參看第la圖和lb圖’用於局部暗淡之傳統咖 1〇使用了 LED模組M1 i㈣的合併，每—l mu，是設計成將光照耀在lcd面板之相應部份 ED柄組M1至Mu均包括複數個設置在印刷電^ 93916 6 1359998 …板（prmted circuit board ; PCB)11 上的 LED 12 卜每一 Led •模組Ml至M.12亦可包括至少一個個別的紅、綠和藍 led ’以產生白光。同時，在LED模組⑷至mi2裡= LED 121中，相同顏色的LED是彼此電性連接。對此電性 連接來說，第厂引線圖案（未顯示）是形成在pcB上該等 LED未設置的一些區域。 、 . 每一個LED模組Ml至M12均是單獨的驅動以照耀 出不同亮度的光，因此實施了局部暗淡為此，複數個驅 動電路是用於分別地驅動LED模組M1至M12。每—個 LED模組M1至M12均應電性連接到一個對應的驅動電 路。為了確保和外部驅動電路間的電性連接，驅動電路連 接器15是分別地設置在背幻〇之最外層周界上的㈣模 組m、M5和M9,該最外層周界是在第丄圖中的最左側。、 在此，在位於該背光之最左側内的每一個模組Ml、 M5和M9内，每一第一引線圖案是直接地和一個對應的 鲁動電路連接器15連接。然而，位於LED模組]νπ、和 Μ9的右側之LED模組Μ2至Μ4、Μ6至％8和μι〇至 Μ12則無法分別地和驅動電路連接器15直接連接。因此， 、LED模組Ml至Μ12是經由模組連接器13而和相鄰的模 •組連接。例如，注意第la圖申位於該最左側之led模組（第 一模組）M1、M5和M9，以及位於該最左侧之右側的led 模組（第二模組)M2、M6和Ml〇。如上所述，每一第一模 組Ml、M5和M9均需具有該引線圖案，以和pCB u上 的該等LED連接。此外，第一模組M1、M5和M9應具有 93916 7 13-59998 第一引線圖案’以將一個’對廊搭 應的驅動電路連接器15 =之=轉器13以及一個對
M-M6,M10^o^PC 和_的LED之第二引線圖荦是组姐、祕 模組M1、M5和M9的第-引線圖案，從 至驅動電路連接器15。在相似的方式下，位於 M2、廳和咖之右側之每—模組⑽、 最終是經由該等模組連接器以及形成在咖 4 7^M11之左側之咖模组上的 术末和一個對應的驅動電路連接器i5連接。 在配置成如上述之用於局部暗淡的傳統lc 中模組犯至Ml2不僅僅需具有用以連接設置在每 _組内的LED 121的第一引線圖案，同需且 有用以將才目鄰的咖模組連接至驅動電路連接器Μ的第 ^引線圖案。這將不利地複雜化配線結構。需注意的是， 在該为光採用小型LED的狀況下，許多LED應會报密隼 = i:PCB上’因此很難蝴呆形成第-和第二引線圖 、同？，如第lb圖所示用於電性連接.LED模組的模 組連接為13和導’線14係形成的較LED 121為高。因此由 ^ED ^21所發出的光會被模組連接器u以及導線μ所遮 蔽。、這會在對應於模組連接器13之㈣面板的區域D上 形成黑暗，因此阻礙了正常的照明。 【發明内容】 93916 8 丄： 墊，其係設置與該雙面印刷電路板的下表面接觸。 根據本發明的較佳實施例，在該等劃分的區域中相鄰 於該等連接器之一個對應之劃分的區域内之至少一個之第 一引線圖案是直接地連接至該等連接器。 【實施方式】 現將參和、所附圖式詳細說明本發明之範例實施例。然 二本發明可用許多不同的形式具體實施，並且不應解釋 為^處提出實施例之限制。確切地說，提供這些實 此揭示將完全和完整，並對熟悉此項技術者而言將 達了本發明之範圍。於圖式中，為了清楚顯示的目 ^八圖：狀1°尺寸可能會予以誇大，而相同的元件符號於 正刀圖中用來表示相同或相似之組件。 第2 a圖係為顯示根據本發、 示器（LCD)背光之上夺面i Λ 晶顯 當，闽 表面的不意平面圖。第2b圖係為顯示 圖之液晶顯示器背光之背表面的平面圖，由其上表面 使用2第h圖和第21>圖，根據本發明之具體實施例之 剛的液晶顯叫 25、 ⑬數個LED22卜複數個驅動電路連接器 雔面Γ目一引線圖案26和複數個第二引線圖案27。 又P刷電路板21包括複數個劃分 a 及導電通孔Μ。發光二極體22ί是置 電路板21的側部。每一第一引線圖案％和在每 21的上表面上。驅動電路連接 電路板 益〇則疋置放在雙面印刷 劃分 93916 10

Claims (1)

1359998 第96112435號專利申請案 100年9月30曰修正替換頁 十、申請專利範園： 1.:種用於使用發光二極體之液晶顯示器的背光單元，包 通孔 雙面印刷電路板’包含複數個劃分的區域以及導電 =數個發光二極體’設置在該雙面印刷電路 衣W上， 的一=伽動電路連接器，設置在該雙面印刷電路板 料第一々引線圖案，形成在該雙面印刷電路板的 a等第—引線圖案之各者將該等劃分的區 域之各者中之該等發光二極體彼此電性連接；以及 複數個第二引線圖案，形成在該雙面印刷電路板的 I表面，以將該等第-引線圖案經由該等導電通孔電性 連接至該複數個驅動電路連接器。 2. 如申請專利範圍第i項之背光單元，其中，該雙面印刷 電路板復包括熱輕射通孔，每一熱輕射通孔形成在該等發 光二極體之各者的下方，該等熱輕射通孔延伸穿過該雙面 印刷電路板的該上表面至該雙面印刷電路板的該下表面。 3. 如申請專利範圍第i項之背光單元，復包括絕緣熱輕射 墊，係設置與該雙面印刷電路板的該下表面接觸。 4. 如申請專利範圍第i項之背光單元，其中，在該等割分 的區域中相鄰於該等連接器之一個對應的劃分的區域 中之該等第-引線圖案中之至少一者係直接連接至該 等連接器。 93916(修正版) 17 1359998 η 第96112435號申請專利申請案 中文圖式第3圖修正圖 100年9月30曰 筘 . vw\.vv < Λ\\\νν .XWWN XXWXV
二 r~ [WV、、' s 匯 no鹕 ?— T™ cv、、、、、 s- WWW W\^> C\J τ—
TW096112435A 2006-04-14 2007-04-10 Backlight for liquid crystal display using light e TWI359998B (en)

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KR1020060034131A KR100755615B1 (ko) 2006-04-14 2006-04-14 발광 다이오드를 이용한 액정 표시 장치의 백라이트

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