TW200827873A - Light source unit and liquid crystal display device - Google Patents

Light source unit and liquid crystal display device Download PDF

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Publication number
TW200827873A
TW200827873A TW096142871A TW96142871A TW200827873A TW 200827873 A TW200827873 A TW 200827873A TW 096142871 A TW096142871 A TW 096142871A TW 96142871 A TW96142871 A TW 96142871A TW 200827873 A TW200827873 A TW 200827873A
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TW
Taiwan
Prior art keywords
light
light source
source unit
emitting
liquid crystal
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TW096142871A
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Chinese (zh)
Inventor
Yuji Takeda
Naoki Tsutsui
Hidetoshi Yano
Toshihiro Shibata
Hideo Yamauchi
Tsukasa Kaji
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Harison Toshiba Lighting Corp
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Publication of TW200827873A publication Critical patent/TW200827873A/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406Control of illumination source
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/24Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/14Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The light source unit of the present invention is characterized in that a plurality of discharge cells 13 formed inside a discharge chamber 1 are grouped into three light emitting groups by external electrodes 15a1 to 15c2, and external electrodes 15a1 to 15c2 of the respective light emitting groups are connected to inverters 3a to 3c. Each light emitting group is sequentially turned on and off for a period of 1/3 of a cycle at different timings by shifting the cycle by 1/3, so as to hardly cause afterimage and have high luminance.

Description

200827873 九、發明說明 【發明所屬之技術領域】 本發明係關於應用液晶顯示之背光及一般照明等所使 用之面狀光源之光源單元及液晶顯示裝置相關。 【先前技術】 近年來,液晶電視等之液晶顯示裝置受到矚目。因爲 液晶顯示裝置具有影像且消耗電力較少之優點。然而,液 晶顯示裝置一向具有動畫較差之缺點,於液晶畫面上播映 動畫時,容易發生動作模糊並產生後像之情形。此種課題 在國際公開第04/053 826號通告(以下,稱爲專利文獻 1)、日本特開2002-68 1 5號公報(以下,稱爲專利文獻2) 亦被提出。 針對上述課題,嚐試以改變背光之點燈方式來進行改 善。使背光全體重複點燈、熄燈之全面閃光方式、及針對 各發光區域改變時序來實施光源之點燈、熄滅之依序點燈 方式係其代表手段。針對依序閃爍點燈方式所記載之公知 實例,如日本特開2000-3 2 1 5 5 1號公報(以下,稱爲專利 文獻3)。如上所示,傳統之依序閃爍點燈方式係利用複 數之冷陰極螢光燈等之線狀光源,而爲使該等燈之發光時 序產生偏差來進行點燈之構成。 然而,利用冷陰極螢光燈實施依序閃爍點燈方式時, 已知可以得到後像抑制效果,然而,卻無法得到充分亮 度。冷陰極螢光燈時,因爲流過每1個燈之電流有其限度 -5- 200827873 而無法得到亮度。該問題,只要增加使用之燈數即可解 決,然而,會導致零件點數及成本之增加,而不太適當。 [專利文獻1]國際公開第04/053826號通告 [專利文獻2]日本特開2002-68 1 5號公報 ’ [專利文獻3]日本特開2000-32 1 55 1號公報 【發明內容】 • 有鑑於如上所述之技術課題,本發明係之目的係在提 不易產生後像之高亮度之光源單元及液晶顯示裝置。 爲了達成上述目的,本發明之光源單元之特徵爲具 備:以可於形成於放電容器內部之複數放電空間放電之方 式,配置電極之面狀光源;及與前述面狀光源之前述電極 電氣相連之點燈電路;且,前述放電容器分割成含有複數 放電空間之複數之發光群組,前述發光群組以依序亮燈熄 滅之方式進行點燈。 • 本發明之特徵,係具備:上述光源單元;及配置於該 光源單元之發光面側之液晶面板;之液晶顯示裝置。 依據本發明,可以提供不易產生後像之高亮度之光源 卓兀及液晶顯不裝置。 【實施方式】 以下,參照圖式,針對本發明之實施形態進行詳細說 明。 -6- 200827873 (第1實施形態) 利用第1圖,針對本發明之第1實施形態之光源單元 進行說明。本實施形態之光源單元,係由平面型螢光燈 1、反相器2a〜2c、以及控制器3所構成。 如第2圖所示,構成平面型螢光燈1之容器之放電容 器1 1,係於平板玻璃基板1 1及波板玻璃基板1 1 b之端緣 塗佈例如接合材之燒結玻璃1 2 1並貼合而構成。 平板玻璃基板1 1 a係由透光性玻璃所構成,例如由鈉 玻璃所構成,本實施形態時,係發光面。於平板玻璃基板 11a之端部,配設著排氣孔llal,於排氣孔llal,利用 燒結玻璃122裝設著排氣晶片lla2。 波板玻璃基板1 1 b與平板玻璃基板1 1 a相同,係由例 如鈉玻璃所構成,本實施形態時,係反射面。波板玻璃基 板1 1 b,因爲其大部分爲波型形狀,貼合平板玻璃基板 1 1 a及波板玻璃基板1 1 b時,利用其波型形狀部分分割放 電空間,而形成複數之放電胞1 3。 對放電胞13,封入含有水銀及稀有氣體之放電媒 體。封入之稀有氣體係從氙、氪、氬、氖、氦所選擇之至 少一種之氣體、或2種以上之混合氣體。此外,封入混合 2種以上之稀有氣體時,以考慮稀有氣體之特有特性來進 行封入爲佳。例如,由氖及氬所構成之混合氣體時,若爲 氖:氬=50:50〜99:1,可以提高發光效率及燈之低電壓起動 性之特性,若爲氖:氬=1 :99〜50:50,可以提高發光之啓動 特性。此外,氣體壓方面,考慮發光效率、低電壓起動 -7- 200827873 性、以及壽命特性,應爲1〜700torr,20〜1 OOtorr爲 佳。 於放電容器1 1之內面,亦即,於平板玻璃基板1 1 a 及波板玻璃基板1 1 b之放電空間側之面,分別形成螢光體 層14a、14b。螢光體層14a、14b只要爲可將藉由放電而 從水銀放射之紫外線轉換成可見光者即可,例如,可以使 用一般照明及冷陰極螢光燈所使用之單色螢光體及RGB 之複數種螢光體。此外,本發明時,以回應速度較快之螢 光體爲佳。例如,RGB之3波長螢光體時,應組合使用 Y203:Eu3 + (R)、Y2Si5:Tb3 + (G)、BaMg2Al10O17:Eu2 + (B)等 之 90%發光啓動時間爲 5msec以下、1/10餘暉時間爲 5msec以下之螢光體。 此處,本實施形態時,因爲平板玻璃基板11a側爲發 光面,波板坡璃基板1 1 b側爲反射面,以提高平板玻璃基 板1 1 a側之光透過效率、提高波板玻璃基板1 1 b側之光反 射效率之構成爲佳。例如,螢光體層1 4a以平均粒徑約 2·5μιη以上、厚度5〜15μιη爲佳,螢光體層14b以平均粒 徑約2.5μιη以下、厚度30〜200μιη爲佳。此外,爲了進 一步提高波板玻璃基板1 1 b側之反射效率,亦可以於波板 玻璃基板1 1 b及螢光體層1 4b之間,形成由氧化鈦、氧化 鋁、氧化釔等所構成之微粒子之金屬氧化物層。此外’爲 了防止水銀擴散,亦可以於螢光體層14a、14b之間,形 成氧化鋁、氧化釔之保護層。 於平板玻璃基板11a之外表面之兩端部之放電胞13 -8- 200827873 之橫切方向’形成被用以施加筒壓電壓及低壓電壓之帶狀 外部電極 15al、15a2、15bl、15b2、15cl、15c2。該外部 電極15al〜15c2係利用含有錫、銦、鉍、鉛、鋅、銻、 銀之至少1種類以上之焊劑,以一邊施加超音波振動一邊 進行分注或浸漬而形成者。此外,外部電極l5al〜15c2 之形成,並無限制,亦可以利用導電性之黏著劑貼附鋁等 之導電性帶、或利用銀等之金屬粉與溶劑及黏合劑混合而 成之導電性膏以網板印刷來形成,進而形成電極。 如第3圖所示,於相鄰之外部電極1 5 a 1及1 5 b 1之 間,配設著間隔d。其係爲了保持電性絕緣,其間隔d以 2mm〜20mm爲佳。 此外,實施本發明時,可實施之電極構造並未受限於 本實施形態。例如,本實施形態時,係於平板玻璃基板 11a形成外部電極,然而,亦可以於波板玻璃基板lib、 或平板玻璃基板11a及波板玻璃基板lib之兩方形成外部 電極。此外,亦可以爲於各放電胞1 3配置1對電極之內 部電極型,並未限制爲外部電極型。此外,亦可以爲組合 著內部電極及外部電極之內外部電極型。 以下,係本實施形態之平面型螢光燈之一規格。 放電容器 1:大小=750mmx450mmx4mm、各放電胞 13 之寬度 W:6.5mm、高度 H.2.4mm。 放電媒體:水銀=100mg、氖及氬之重量比 9:1、 8kPa 〇 螢光體層14a:粒徑=5.0μπι、層之厚度=1〇μπι。 -9- 200827873 螢光體層14b:粒徑=2.4μιη、層之厚度=150μιη。 外部電極 15al〜15c2:20mmxl43mm、相鄰電極之間 隔 d = 5.5 mm 〇 於上述構成之平面型螢光燈之外部電極15al及 15a2、15bl及15b2、15cl及15c2,分別利用導線連結著 反相器3 a、3 b、3 c。亦即,藉由於平面型螢光燈形成電 氣獨立之3個發光群組,可以如第4圖所示,於外部電極 15al及15a2之間實施發光群組A之點燈,於外部電極 15bl及15b2之間實施發光群組B之點燈,於外部電極 15cl及15c2之間實施發光群組C之點燈。該發光群組A 〜C之發光時序,係由連結於反相器2a、2b、2c之控制 器3所控制。 利用第5圖,針對本實施形態之各發光群組之發光時 序進行說明。此外,平面型螢光燈之點燈頻率爲65kHz。 發光群組A〜C,相對於1週期,具有1 /3之ON期間且 以各發光群組之ON期間之發光時序具有偏差之方式點 燈。具體而言,發光群組 A〜C,相對於 1週期 8.3mseC(120Hz),ON期間爲2 · 7 8 m s e c,一邊以發光群組 A +發光群組B +發光群組C +…之依序點燈之方式改變發 光群組來進行點燈(以下,稱爲依序閃爍點燈)。 此外,第5圖中,發光群組爲OFF時,其他發光群 組爲ON期間,以全體而言,以發光不會中斷且與其他群 組之發光不會重複之方式點燈,然而,亦可存在發光不連 續之期間、或存在部分發光重疊之期間。此種發光時序, -10- 200827873 已明確地確認播映於液晶畫面上之動畫不會產生後像。 此外,如上面所述之點燈方式時,縮縮1週期時(提 高頻率時)、或分割成較多發光群組時,本發明者已確認 可以容易地抑制後像。前者係控制之問題,可隨著1C等 之改良來縮短 1週期,以現狀而言,可縮短至 lmsec(=lkHz)程度。 另一方面,後者只要分割成較多之發光群組即可,本 發明係分成1 〇個程度。只是,隨著發光群組之分割,1 個發光群組可以得到之光量較少,亮度會降低。針對此亮 度降低之問題,本實施形態之平面型螢光燈時,係對增對 各發光群組供應之電流値來解決。這是各發光群組含有複 數放電胞之平面型螢光燈才可以採用的方法。亦即,1個 發光群組之亮度係由流過其外部電極之電流所決定,然 而,平面型螢光燈時,因爲電流依發光群組所含有之放電 胞數之比例進行分流,流過各放電胞之電流之限度內,發 光群組可以得到期望之亮度。同時,冷陰極螢光燈等之利 用線狀光源實施依序閃爍點燈方式時,因爲線狀光源流過 1個燈之電流値之限度較低,不增加燈個數就無法解決亮 度問題,會導致零件點數及成本之增加。由以上之觀點而 言,本點燈方式時,以平面型螢光燈爲最佳。 因此,本實施形態時,將平面型螢光燈1之放電容器 11分割成含有複數放電胞13之複數發光群組,藉由該發 光群組之依序閃爍點燈,可以防止將動畫投射於液晶畫面 上時容易產生之後像。此外,各發光群組藉由含有複數放 -11 - 200827873 電胞1 3,可以使大電流流過電極間,而達成高亮度。此 外,因爲只利用光源單元即可充分防止後像。液晶面板側 無需後像對策,可實現液晶面板之構成簡化。 (第2實施形態) 利用第6圖,針對本發明之第2實施形態之光源單元 進行說明。本第2實施形態之各部,與第1實施形態之光 源單元之各部爲相同之部分以相同符號表示,並省略其說 明。 本實施形態時,利用3個橫長平面型螢光燈1 a〜 1 e,將其進行縱接,構成各燈可獨立發光之發光群組A〜 C。因此,本實施形態時,亦可與第1實施形態相同,可 以實現時序偏差之點燈控制。 此外,本實施形態時,因爲1個燈可以比第1實施形 態更爲小型化,故製造容易且相鄰之燈之較易取得電極絕 緣而較爲有利。因此,本實施形態時,與第1實施形態相 同,可以防止將動畫投射於液晶畫面上時所容易產生之後 像。此外,因爲以1個燈形成1個發光群組,各燈容易製 造。此外,發光群組間之絕緣可較爲容易也更確實。 (第3實施形態) 利用第7圖,針對本發明之第3實施形態之光源單元 進行說明。本實施形態之各部’與第1實施形態之光源單 元之各部爲相同之部分以相同符號表示,並省略其說明。 -12- 200827873 本實施形態時,於單側各形成6個外部電極,以外形 而言,係分割成6個發光群組而構成。只是,因爲於外部 電極15all、15al2間與外部電極15a2 1、15a22間,連結 著反相器3a,該等以相同時序發光。此外,於外部電極 15bl 1、15bl2間與外部電極15b21、15b22間,連結著反 ' 相器 3b,於外部電極 15cll、15cl2間與外部電極 15c21、15c22間,連結著反相器3c。亦即,點燈時,有 • 3不同發光時序之發光群組,與第1、2實施形態相同, 係實質上分割成3個發光群組之狀態。 本實施形態時,因爲從上而下分割成發光群組 A、 B、C、A、B、C,可以於液晶畫面之上半面及下半面實施 依序閃爍點燈,結果,更容易抑制後像。因此,本實施形 態時,與第1實施形態相同,可以防止將動畫投射於液晶 畫面上時所容易產生之後像。 # (第4實施形態) 利用第8圖,針對本發明之第4實施形態之液晶顯示 裝置進行說明。本第4實施形態之各部,與第1實施形態 之光源單元之各部爲相同之部分以相同符號表示,並省略 其說明。 本實施形態之液晶顯示裝置係由背光BL、前框FF、 後框BF所構成。背光BL係如上述實施形態所說明之於 光源單元之發光面側配設擴散板等,並以外殼進行保持 者。此外,於外殻之背面,配置著反相器3a〜3b。前框 -13- 200827873 FF具有開口面,於該開口面,配設著液晶面板LCP °背 框BF具有有底開口之框體,於其內部,配置著背光BL。 此外,於有底開口之框體之下部,裝設著台座。亦即,本 液晶顯示裝置係以發光面相對於地面略呈垂直之狀態來使 用。 如上述構成之液晶顯示裝置,如上面所述,藉由當做 背框BF內之光源單元使用之背光BL之點燈方式,無需 使液晶面板LCP執行特別動作,即可防止液晶畫面上之 後像。因此,本實施形態時,以簡單構造即可防止動畫投 射於液晶畫面上時容易產生之後像。 此外,本發明實施形態並未受限於上述者,例如,可 以進行如下所示之變更。上述各實施形態時,係以縱排並 列發光群組來進行點燈,然而,發光群組亦可爲橫列或縱 橫並列來進行點燈。此外,如第5圖之時序圖所示,爲了 使光源單元之構造更爲簡單,係以發光群組A〜C之發光 期間爲相同之期間來進行點燈,然而,並非一定要相同。 此外,液晶面板之ON、OFF,亦可以爲配合該液晶面板 之時序來實施發光群組A〜C之ON、OFF之點燈方式。 【圖式簡單說明】 第1圖係本發明之第1實施形態之光源單元之全體 圖。 第2圖係從箭頭方向觀看第1圖之X-X’剖面時之剖 面圖。 -14- 200827873 第3圖係係第2圖之Y部分之放大圖。 第4圖係上述第1實施形態之光源單元之平面圖。 第5圖係上述第1實施形態之各發光群組之發光時序 之時序圖。 ~ 第6圖係本發明之第2實施形態之光源單元之全體 • 圖。 第7圖係本發明之第3實施形態之光源單元之全體 • 圖。 第8圖係本發明之第4實施形態之液晶顯示裝置之分 解立體圖。 【主要元件符號說明】 1 :平面型螢光燈 2a :反相器 2b :反相器 • 2c :反相器 3 :控制器 1 1 :放電容器 11a·平板玻璃基板 llal :排氣孔 Ua2 :排氣晶片 1 1 b :波板玻璃基板 1 3 :放電胞 14a :螢光體層 -15- 200827873 螢光體層 外部電極 :外部電極 :外部電極 外部電極 :外部電極 :外部電極 外部電極 :外部電極 :外部電極 外部電極 :外部電極 :外部電極 外部電極 :外部電極 :外部電極 外部電極 z外部電極 :外部電極 121 :燒結玻璃BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source unit and a liquid crystal display device using a planar light source used for backlighting of a liquid crystal display and general illumination. [Prior Art] In recent years, liquid crystal display devices such as liquid crystal televisions have attracted attention. This is because the liquid crystal display device has an image and consumes less power. However, the liquid crystal display device has always been disadvantageous in that the animation is poor, and when the animation is broadcast on the liquid crystal screen, the motion blur is likely to occur and the rear image is generated. Such a problem is also proposed in the publication No. 04/053,826 (hereinafter referred to as Patent Document 1) and JP-A-2002-681-5 (hereinafter referred to as Patent Document 2). In response to the above problems, attempts have been made to improve the lighting method by changing the backlight. A method of representing the entire flash backlight in which the backlight is repeatedly turned on and off, and a flashing mode in which the light source is turned on and off for changing the timing of each of the light-emitting regions is a representative means. A well-known example of the sequential flashing lighting method is disclosed in Japanese Laid-Open Patent Publication No. 2000-3 2 1 5 5 1 (hereinafter referred to as Patent Document 3). As described above, the conventional sequential flashing lighting method uses a linear light source such as a plurality of cold cathode fluorescent lamps, and the lighting is performed in order to cause variations in the light emission timing of the lamps. However, when the sequential flashing lighting method is implemented by a cold cathode fluorescent lamp, it is known that a post image suppressing effect can be obtained, but sufficient brightness cannot be obtained. In the case of a cold cathode fluorescent lamp, the brightness is not obtained because the current flowing through each of the lamps has a limit of -5 - 200827873. This problem can be solved by increasing the number of lamps used, however, it will result in an increase in the number of parts and costs, and is not appropriate. [Patent Document 1] International Publication No. 04/053826 [Patent Document 2] Japanese Laid-Open Patent Publication No. 2002-68 No. 5-5 [Patent Document 3] Japanese Laid-Open Patent Publication No. 2000-32 1 55 No. In view of the above-described technical problems, the present invention is directed to a light source unit and a liquid crystal display device which are capable of producing a high-intensity image of a rear image. In order to achieve the above object, a light source unit of the present invention is characterized in that: a planar light source in which an electrode is disposed so as to be dischargeable in a plurality of discharge spaces formed inside a discharge vessel; and electrically connected to the electrode of the planar light source a lighting circuit; and the discharge vessel is divided into a plurality of light-emitting groups including a plurality of discharge spaces, and the light-emitting group is turned on in a manner of sequentially turning on and off. A feature of the present invention is the liquid crystal display device comprising: the light source unit; and a liquid crystal panel disposed on a light emitting surface side of the light source unit; According to the present invention, it is possible to provide a light source and a liquid crystal display device which are less likely to generate a high brightness of a rear image. [Embodiment] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. -6-200827873 (First Embodiment) A light source unit according to a first embodiment of the present invention will be described with reference to Fig. 1 . The light source unit of the present embodiment is composed of a flat fluorescent lamp 1, inverters 2a to 2c, and a controller 3. As shown in Fig. 2, the discharge vessel 1 1 constituting the container of the flat fluorescent lamp 1 is coated with a sintered glass of, for example, a bonding material, on the edge of the flat glass substrate 1 1 and the corrugated glass substrate 1 1 b. 1 and fit together. The flat glass substrate 1 1 a is made of translucent glass, and is made of, for example, soda glass. In the present embodiment, it is a light-emitting surface. An exhaust hole 11a1 is disposed at an end portion of the flat glass substrate 11a, and an exhaust wafer 11a2 is attached to the exhaust hole 11a by the frit glass 122. The corrugated glass substrate 1 1 b is formed of, for example, soda glass, similarly to the flat glass substrate 1 1 a, and is a reflecting surface in the present embodiment. The wave plate glass substrate 1 1 b has a wave shape, and when the flat glass substrate 1 1 a and the wave plate glass substrate 1 1 b are bonded, the discharge space is divided by the wave shape portion to form a plurality of discharges. Cell 13 The discharge cell 13 is sealed with a discharge medium containing mercury and a rare gas. The rare gas system enclosed is at least one selected from the group consisting of ruthenium, osmium, argon, krypton and xenon, or a mixture of two or more. Further, when two or more kinds of rare gases are mixed and sealed, it is preferable to carry out sealing in consideration of the characteristic characteristics of the rare gas. For example, in the case of a mixed gas composed of helium and argon, if argon: argon = 50:50 to 99:1, the luminous efficiency and the low voltage startability of the lamp can be improved, if 氖: argon = 1:99 ~50:50, can improve the starting characteristics of the light. In addition, in terms of gas pressure, considering luminous efficiency, low voltage starting, and life characteristics, it should be 1 to 700 torr, preferably 20 to 1 OOtorr. The phosphor layers 14a and 14b are formed on the inner surface of the discharge vessel 1 1 , that is, on the surface of the flat glass substrate 1 1 a and the discharge glass side of the corrugated glass substrate 1 1 b. The phosphor layers 14a and 14b may be any ones that can convert ultraviolet rays emitted from mercury by discharge into visible light. For example, a monochromatic phosphor used in general illumination and cold cathode fluorescent lamps and a plurality of RGB can be used. Kind of phosphor. Further, in the present invention, it is preferred to respond to a phosphor having a relatively fast speed. For example, in the case of RGB 3-wavelength phosphors, 90% of the illuminating start time of Y203:Eu3 + (R), Y2Si5:Tb3 + (G), BaMg2Al10O17:Eu2 + (B), etc. should be 5 msec or less, 1/ 10 phosphors with a time of less than 5 msec. In the present embodiment, the side of the flat glass substrate 11a is a light-emitting surface, and the side of the plate-glass substrate 1 1 b is a reflecting surface, so that the light transmission efficiency of the flat glass substrate 1 1 a side is improved, and the wave plate glass substrate is improved. The composition of the light reflection efficiency of the 1 1 b side is preferably. For example, the phosphor layer 14a preferably has an average particle diameter of about 2. 5 μm or more and a thickness of 5 to 15 μm, and the phosphor layer 14b preferably has an average particle diameter of about 2.5 μm or less and a thickness of 30 to 200 μm. Further, in order to further improve the reflection efficiency of the wave plate glass substrate 1 1 b side, a structure composed of titanium oxide, aluminum oxide, cerium oxide or the like may be formed between the wave plate glass substrate 1 1 b and the phosphor layer 14 b. A metal oxide layer of microparticles. Further, in order to prevent the diffusion of mercury, a protective layer of aluminum oxide or cerium oxide may be formed between the phosphor layers 14a and 14b. The strip-shaped external electrodes 15al, 15a2, 15b1, 15b2, 15cl for applying the barrel voltage and the low voltage are formed in the transverse direction of the discharge cells 13-8-200827873 at both ends of the outer surface of the flat glass substrate 11a. , 15c2. The external electrodes 15a1 to 15c2 are formed by using a flux containing at least one type of tin, indium, antimony, lead, zinc, antimony or silver, and dispensing or immersing while applying ultrasonic vibration. Further, the formation of the external electrodes 15a to 15c2 is not limited, and a conductive tape such as aluminum may be attached by a conductive adhesive, or a conductive paste obtained by mixing a metal powder such as silver with a solvent and a binder. It is formed by screen printing to form an electrode. As shown in Fig. 3, a space d is provided between the adjacent external electrodes 1 a a 1 and 1 5 b 1 . In order to maintain electrical insulation, the interval d is preferably 2 mm to 20 mm. Further, in the practice of the present invention, the electrode structure that can be implemented is not limited to this embodiment. For example, in the present embodiment, the external electrode is formed on the flat glass substrate 11a. However, the external electrode may be formed on both the wave plate glass substrate lib or the flat glass substrate 11a and the wave plate glass substrate lib. Further, an internal electrode type of one pair of electrodes may be disposed in each of the discharge cells 13 and is not limited to the external electrode type. Further, it may be an internal and external electrode type in which an internal electrode and an external electrode are combined. Hereinafter, it is one of the specifications of the flat fluorescent lamp of this embodiment. The discharge capacitor 1: size = 750 mm x 450 mm x 4 mm, width of each discharge cell 13 W: 6.5 mm, height H. 2.4 mm. Discharge medium: mercury = 100 mg, weight ratio of helium to argon 9: 1, 8 kPa 萤 phosphor layer 14a: particle size = 5.0 μm, thickness of layer = 1 〇 μπι. -9- 200827873 Phosphor layer 14b: particle diameter = 2.4 μm, thickness of layer = 150 μmη. External electrodes 15a1 to 15c2: 20 mm x 14 mm, and the interval between adjacent electrodes is d = 5.5 mm. The external electrodes 15a1 and 15a2, 15b1, 15b2, 15cl, and 15c2 of the above-described planar fluorescent lamp are respectively connected to the inverter by wires. 3 a, 3 b, 3 c. That is, by forming the three independent light-emitting groups by the planar fluorescent lamp, as shown in FIG. 4, the lighting of the light-emitting group A can be performed between the external electrodes 15a1 and 15a2, and the external electrodes 15b1 and The lighting of the group B is performed between 15b2, and the lighting of the group C is performed between the external electrodes 15cl and 15c2. The light emission timings of the light-emitting groups A to C are controlled by the controller 3 connected to the inverters 2a, 2b, and 2c. The light-emitting timing of each of the light-emitting groups of the present embodiment will be described with reference to Fig. 5. In addition, the spotlight fluorescent lamp has a lighting frequency of 65 kHz. The light-emitting groups A to C are turned on with a 1/3 ON period with respect to one cycle and with a variation in the light-emitting timing of the ON period of each light-emitting group. Specifically, the light-emitting groups A to C are 8.3 mseC (120 Hz) with respect to one cycle, and the ON period is 2 · 7 8 msec, while the light-emitting group A + the light-emitting group B + the light-emitting group C + ... In the manner of lighting, the lighting group is changed to perform lighting (hereinafter, referred to as sequential flashing). In addition, in the fifth diagram, when the light-emitting group is OFF, the other light-emitting groups are in the ON period, and the light is not interrupted in the whole manner, and the light is not repeated in the other groups, however, There may be a period in which the luminescence is discontinuous, or a period in which partial luminescence overlaps. Such a lighting timing, -10- 200827873, has clearly confirmed that an animation broadcast on a liquid crystal screen does not produce a rear image. Further, in the case of the above-described lighting method, when the first cycle is reduced (when the frequency is increased) or when the light is divided into a plurality of light-emitting groups, the inventors have confirmed that the rear image can be easily suppressed. The former is a problem of control, which can be shortened by one cycle with the improvement of 1C, etc., and can be shortened to lmsec (=lkHz) in the current situation. On the other hand, the latter can be divided into a plurality of light-emitting groups, and the present invention is divided into one degree. However, with the division of the illumination group, the amount of light that can be obtained by one illumination group is small, and the brightness is reduced. In view of the problem of the reduction in brightness, the planar fluorescent lamp of the present embodiment is solved by increasing the current supplied to each of the light-emitting groups. This is a method that can be employed in a flat type fluorescent lamp in which each light-emitting group contains a plurality of discharge cells. That is, the brightness of one illumination group is determined by the current flowing through the external electrodes. However, in the case of a planar fluorescent lamp, the current is shunted according to the ratio of the number of discharge cells contained in the illumination group. Within the limits of the current of each of the discharge cells, the illumination group can obtain the desired brightness. At the same time, when the cold cathode fluorescent lamp or the like uses a linear light source to perform the sequential flashing lighting method, since the limit of the current flowing through the one light source of the linear light source is low, the brightness problem cannot be solved without increasing the number of lamps. This will result in an increase in the number of parts and costs. From the above point of view, in the case of the lighting method, a flat fluorescent lamp is preferred. Therefore, in the present embodiment, the discharge vessel 11 of the planar fluorescent lamp 1 is divided into a plurality of light-emitting groups including a plurality of discharge cells 13, and the illumination group is sequentially flashed to prevent the animation from being projected on the image. It is easy to produce a subsequent image on the LCD screen. In addition, each of the light-emitting groups can generate a high current by flowing a large current through the electrodes by including a plurality of cells 11 - 200827873. In addition, the rear image can be sufficiently prevented by using only the light source unit. The liquid crystal panel side can be simplified without the need for post-image countermeasures. (Second Embodiment) A light source unit according to a second embodiment of the present invention will be described with reference to Fig. 6 . The parts of the second embodiment that are the same as those of the light source unit of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, three horizontally long flat fluorescent lamps 1 a to 1 e are used for longitudinal connection to form light-emitting groups A to C in which the lamps can independently emit light. Therefore, in the present embodiment, as in the first embodiment, the lighting control of the timing deviation can be realized. Further, in the present embodiment, since one lamp can be made smaller than the first embodiment, it is advantageous in that it is easy to manufacture and it is easy to obtain electrode insulation from adjacent lamps. Therefore, in the present embodiment, as in the first embodiment, it is possible to prevent the subsequent image from being easily generated when the animation is projected on the liquid crystal screen. Further, since one light-emitting group is formed by one lamp, each lamp can be easily manufactured. In addition, the insulation between the groups of lights can be easier and more reliable. (Third Embodiment) A light source unit according to a third embodiment of the present invention will be described with reference to Fig. 7. The same portions as those of the light source unit of the first embodiment are denoted by the same reference numerals and will not be described. -12- 200827873 In the present embodiment, six external electrodes are formed on one side, and are divided into six light-emitting groups in an outer shape. However, since the inverter 3a is connected between the external electrodes 15all and 15al2 and the external electrodes 15a2 1 and 15a22, the light is emitted at the same timing. Further, a reverse phase comparator 3b is connected between the external electrodes 15b1 and 15b12 and the external electrodes 15b21 and 15b22, and an inverter 3c is connected between the external electrodes 15c11 and 15cl2 and the external electrodes 15c21 and 15c22. That is, in the case of lighting, there are three groups of light-emitting groups having different light-emitting timings, which are substantially divided into three light-emitting groups as in the first and second embodiments. In the present embodiment, since the light-emitting groups A, B, C, A, B, and C are divided from the top to the bottom, sequential flashing can be performed on the upper half and the lower half of the liquid crystal screen, and as a result, it is easier to suppress. image. Therefore, in the present embodiment, as in the first embodiment, it is possible to prevent the subsequent image from being easily generated when the animation is projected on the liquid crystal screen. (Fourth Embodiment) A liquid crystal display device according to a fourth embodiment of the present invention will be described with reference to Fig. 8. The components of the fourth embodiment are denoted by the same reference numerals as the components of the light source unit of the first embodiment, and the description thereof will be omitted. The liquid crystal display device of this embodiment is composed of a backlight BL, a front frame FF, and a rear frame BF. The backlight BL is provided with a diffusion plate or the like on the light-emitting surface side of the light source unit as described in the above embodiment, and is held by a casing. Further, inverters 3a to 3b are disposed on the back surface of the casing. Front frame -13- 200827873 FF has an open surface, and a liquid crystal panel LCP is provided on the open surface. The back frame BF has a frame with a bottom opening, and a backlight BL is disposed inside the front frame. In addition, a pedestal is installed under the frame with the bottom opening. That is, the liquid crystal display device is used in a state where the light emitting surface is slightly perpendicular to the ground. As described above, the liquid crystal display device having the above configuration can prevent the rear image on the liquid crystal screen without performing a special operation of the liquid crystal panel LCP by performing the lighting method of the backlight BL used as the light source unit in the back frame BF. Therefore, in the present embodiment, it is possible to prevent the subsequent image from being easily generated when the animation is projected on the liquid crystal screen with a simple configuration. Further, the embodiment of the present invention is not limited to the above, and for example, the following changes can be made. In the above embodiments, the lighting is performed by the tandem array of light-emitting groups. However, the light-emitting groups may be arranged in parallel or vertically. Further, as shown in the timing chart of Fig. 5, in order to make the structure of the light source unit simpler, the lighting periods of the light-emitting groups A to C are the same period, but they are not necessarily the same. Further, the ON or OFF of the liquid crystal panel may be a lighting method in which the light-emitting groups A to C are turned ON and OFF in accordance with the timing of the liquid crystal panel. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a general view of a light source unit according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing the X-X' section of Fig. 1 as seen from the direction of the arrow. -14- 200827873 Figure 3 is an enlarged view of the Y section of Figure 2. Fig. 4 is a plan view showing the light source unit of the first embodiment. Fig. 5 is a timing chart showing the light emission timing of each of the light-emitting groups in the first embodiment. ~ Fig. 6 is a view showing the entire light source unit according to the second embodiment of the present invention. Fig. 7 is a view showing the entirety of a light source unit according to a third embodiment of the present invention. Fig. 8 is an exploded perspective view showing a liquid crystal display device of a fourth embodiment of the present invention. [Description of main component symbols] 1 : Flat fluorescent lamp 2a : Inverter 2b : Inverter • 2c : Inverter 3 : Controller 1 1 : Discharge capacitor 11a · Flat glass substrate 11L : Vent hole Ua2 : Exhaust wafer 1 1 b : Wave plate glass substrate 1 3 : Discharge cell 14a : Phosphor layer -15 - 200827873 Phosphor layer external electrode: External electrode: External electrode External electrode: External electrode: External electrode External electrode: External electrode: External electrode External electrode: External electrode: External electrode External electrode: External electrode: External electrode External electrode z External electrode: External electrode 121: Sintered glass

Claims (1)

200827873 十、申請專利範圍 1. 一種光源單元,其特徵爲: 具備:以可於形成於放電容器內部之複數放電空間放 電之方式,配置電極之面狀光源;及與前述面狀光源之前 ^ 述電極電氣相連之點燈電路;且 前述放電容器分割成含有複數放電空間之複數之發光 群組, • 前述發光群組以依序亮燈熄滅之方式進行點燈。 2. 如申請專利範圍第1項所記載之光源單元,其中 前述放電空間分成η個發光群組, 前述發光群組係以分別爲約1 /η週期之發光期間且各 以錯開約1 /η週期之發光時序依序亮燈熄滅之方式點燈。 3·如申請專利範圍第1或2項所記載之光源單元, 其中 前述電極係以橫切過複數前述放電空間之方式,形成 i 於前述放電容器之外面之外部電極, 前述發光群組係以形成複數前述外部電極之方式進行 ‘ 分割。 4. 如申請專利範圍第1或2項所記載之光源單元, 其中 前述發光群組係由使用複數之本身具有1或複數之發 光群組之面狀光源所形成。 5. —種液晶顯示裝置,其特徵爲具備: 申請專利範圍第1或2項所記載之光源單元、及配置 -17- 200827873 於前述光源單元之發光面側之液晶面板200827873 X. Patent application scope 1. A light source unit, characterized in that: a planar light source for arranging electrodes in a manner of discharging in a plurality of discharge spaces formed inside a discharge vessel; and before said planar light source a lighting circuit electrically connected to the electrode; and the discharge vessel is divided into a plurality of light-emitting groups including a plurality of discharge spaces, and the light-emitting group is turned on in a manner of sequentially turning on and off. 2. The light source unit according to claim 1, wherein the discharge space is divided into n light-emitting groups, wherein the light-emitting groups are respectively in a light-emitting period of about 1 / η period and each is shifted by about 1 / η The lighting timing of the cycle lights up in a manner that the lights are turned off. 3. The light source unit according to claim 1 or 2, wherein the electrode is formed to cross the plurality of discharge spaces to form an external electrode on the outer surface of the discharge vessel, wherein the light-emitting group is The manner of forming the plurality of external electrodes described above is 'divided. 4. The light source unit according to claim 1 or 2, wherein the light-emitting group is formed by using a plurality of planar light sources having one or a plurality of light-emitting groups. 5. A liquid crystal display device comprising: a light source unit according to claim 1 or 2, and a liquid crystal panel disposed on a light emitting surface side of the light source unit of -17-200827873
TW096142871A 2006-12-18 2007-11-13 Light source unit and liquid crystal display device TW200827873A (en)

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JP2006339698A JP2008152001A (en) 2006-12-18 2006-12-18 Light source unit and liquid crystal display device

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TW200827873A true TW200827873A (en) 2008-07-01

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TW096142871A TW200827873A (en) 2006-12-18 2007-11-13 Light source unit and liquid crystal display device

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CN101206344A (en) 2008-06-25
JP2008152001A (en) 2008-07-03

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