TWI317445B - - Google Patents
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- TWI317445B TWI317445B TW094123634A TW94123634A TWI317445B TW I317445 B TWI317445 B TW I317445B TW 094123634 A TW094123634 A TW 094123634A TW 94123634 A TW94123634 A TW 94123634A TW I317445 B TWI317445 B TW I317445B
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- light
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- illumination
- lighting
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- 238000005286 illumination Methods 0.000 claims description 23
- 239000003086 colorant Substances 0.000 claims description 8
- 238000004898 kneading Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 15
- 239000003990 capacitor Substances 0.000 description 4
- 230000005669 field effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/34—Control 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
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
-
- 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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/34—Control 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
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
-
- 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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
1317445 九、發明說明: 【發明所屬之技術領域】 本發明係關於使用非發光之透過型之顯示部之顯示裝置、 以及設置於顯示裝置之背面側之背光裝置者。 【先前技術】 液晶面板之背光源,雖以使用螢光燈管之CCFL(冷陰極 螢光燈 ’· Cold Cathode Fluorescent Lamp)為主流,但基於 環境之考量,逐漸被要求不含水銀者。因此,近年,作為 替代CCFL之光源,發光二極體(LED)受到高度之期待。尤 其,個別地使用紅色LED、綠色LED、藍色LED之各原色 進行光學上之合成加法混色而獲得白色光之方法,由於較 易保持顏色之均衡’作為電視用途使用—事受到熱烈地檢 討0 以led作為背光源使用之情形,由於紅色LED、綠色 LED、藍色led之發光效率有所不同,因此,流至各色之 ㈣之電流亦須與其他之顏色相互獨立。此外,由於各個 顏色所使用之LED其半導體組成Μ,㈣,每—個 於元件之電壓方面亦有差異,消耗電力亦不相同。而且, 為背:源使用之情形’基於現實之成本觀點,無 法個別地驅動每一個之led。 因此,以LED作為f㈣❹ 式遠桩茸蛀^ t 係刼用U串聯方 式連接某特疋數目之LED並一併加以驅動之形式。 =而t ’係採用為負载之每一個—群之 接之群組,例如由紅 串聯連 監母—個顏色之各特定個數之 】01844.doc 1317445 LED所串聯連接之群組,其包含DC-DC(direct current-direct current ; 直流對 直流)轉 換器電 源以及 PWM(pulse width modulation ;脈寬調變)控制部,並藉由流至各個群 組之LED之電流進行PWM調整,而調整因紅、綠、藍之合 成而產生之顏色與亮度之形式。 ' [專利文獻1]特開2001-272938號公報。 [發明所欲解決之問題] • 然而,LED其對於溫度之發光量因各個顏色而不同。圖 15中揭示LED之發光之基本之溫度特性。圖15之圖表其X 軸表示元件溫度,Y軸表示相對亮度,並將元件温度25°C 之點訂為1 00°/。,而比較紅色LED(R)、綠色LED(G)、藍色 LED(B)之光輸出量者。 紅色之LED係之四元素系(磷化鋁銦鎵;AlInGaP)之半導 體層狀構造,其帶間隙能量(bandgap energy)低。因此,高 溫時,提供用於發光之載子(carrier)減少,發光光量下 ® 降,於一般元件之操作溫度(working temperature)75 °C之 程度之狀態下,亮度將下降為常溫時(25 °C )之70%之程 度,與其他顏色相比較其變化較為劇烈。
. 另一方面,已知由於使用氮化銦鎵(InGaN)之綠色LED 以及藍色LED,其波長較紅色短,而更接近於紫色,因此 帶間隙能量大,變得不易受到溫度之影響。圖15之圖表中 藍色LED(B)之温度特性亦顯示大致平坦之性質。 雖係具有以上之性質之LED,作為液晶顯示裝置之背光 之光源使用之情形,通常,由於削減總個數之目的,各個 I01844.doc 1317445 元件之輸入電力變大。此外,使用LED作為液晶顯示裝置 之背光之光源之情形,通常’由於係以串聯之方式連接, 故存在熱阻(thermal resistance),而導致各行之.負載之變 動亦變大。其結果為LED之發熱量產生變動’亦即,溫度 係時時刻刻地變化。因此產生紅色LED之亮度大幅地下 降,而另一方面,藍色LED之亮度則不太會下降之現象。 此外,藉由從LED發生之熱所加溫之空氣,由於其比重 變輕,因而上昇。 因此,使用LED作為液晶顯示裝置之背光之光源之情 形晝面之上侧,其溫度變高,紅光之輸出下降,而成為 帶有藍色。此外,晝面之下側,其溫度變低,由於紅光之 輸出不太會下降,因此產生亮度與顏色均不相同之現象。 此種傾向於畫面之尺寸愈大時愈嚴重。 為解決以上之技術問題,消除由於溫度分布之變動所產 生之晝面亮度之變動一事係吾人所企望者。 【發明内容】 關於本發明之實施之型態之背光裝置,其包含具有以串 聯方式所連接之複數之發光二極體之照明單元hnh)、以 及與各照明單元相對應而設置之驅動各照明單元之發光二 ,體之驅動部、以及檢測各照明單元之溫度之溫度檢測 部,其中,各照明單元係被分別地配置於其發光二極體成 為特定之溫度區域之位置上,而驅動部則係按照利用溫度 j P所k測之各照明單元之溫度而就每_個照明單元調 整机至發光二極體之電流,以便即使照明單元有溫度變化 101844.doc 1317445 裝置20從背面側照射白色光之狀態下,以動態矩陣(active matrix)方式加以驅動,因而獲得期望之純色(fuU c〇1〇r)視 頻顯示。 背光裝置20包含光源21與波長可調性濾光鏡(waveiength tunable filter)22。背光裝置2〇係將從光源21所發出之光線 介由波長可調性濾光鏡22從背面側照明彩色液晶顯示面板 10 ° 彩色液晶顯示裝置1 〇〇係利用例如圖2所示之電性區塊之 構造之驅動電路200所驅動。 驅動電路200包含供應彩色液晶顯示面板1〇與背光裝置 20之驅動電源之電源部〗10、以及驅動彩色液晶顯示面板 10之X驅動電路120與Y驅動電路130、以及來自於外部之 視頻信號係介由輸入端子140所提供之RGB程序(process) 處理部15 0、以及連接於此RGB程序處理部15 〇之視頻記憶 體160與控制部170、以及驅動控制背光裝置2〇之背光驅動 控制部180等。 於驅動電路200 ’介由輸入端子140所輸入之視頻信號藉 由RGB程序處理部150實施色度處理(Chroma)等之信號處 理,並且從合成信號(composite signal)轉換成適合於彩色 液晶顯示面板10之驅動之RGB分離信號(separate signal)後 提供至控制部170 ’並且’介由視頻記憶體160提供至χ驅 動器120。此外’控制部170係藉由於按照上述rgb分離信 號之特定之時序(timing)控制X驅動器12〇與γ驅動電路 130,並利用介由上述視頻記憶體160提供予X驅動器120之 101844.doc • η · 1317445 RGB分離信號驅動彩色液晶顯示面板1〇,而顯示按照上述 RGB分離信號之視頻。 背光裝置20係設置於透過型之彩色液晶顯示面板1〇背 面,而從彩色液晶顯示面板10之背面正下方加以照明之正 下方型。背光裝置20之光源21具有複數之發光二極體 (LED : Light Emitting Diode),並以此等複數之發光二極 體作為發光源。複數之發光二極體被分割成由一群之發光 二極體所構成之群组,而就每一個群組進行驅動。 茲就背光裝置20之光源21中發光二極體之配置加以說 明。 圖3係發光二極體之配置實例,顯示每一個單格(unh cell)4-l ' 4-2中分別使用2個紅色之發光二極體1、綠色之 發光二極體2、以及藍色之發光二極體3,而將合計6個之 發光二極排列成一列之情形。 此配置實例中,單格4雖包含6個之發光二極體,但為利 用使用之發光二極體之額定(rating) '發光效率等,將混合 色作成平衡性佳之白色光,有調整光輸出平衡之必要,因 此各色之個數分配可能有本實例以外之變化。 在圖3所示之配置實例中,單格4_丨與單格4_2係完全相 同之構造,而以中央之雙向箭頭連接。此外,圖4係利用 電性電路圖記號之二極體符號表示單格‘丨與單格4_2之形 狀者。此例之情形,各發光二極體,亦即,紅色之發光二 極體1、綠色之發光二極體2、以及藍色之發光二極體3係 沿著電流由左至右之流動方向,調和極性,而以串聯方式 101844.doc -12- 1317445 連接。 此處,若將分別使用2個紅色之發光二極體1、綠色之發 光二極體2、以及藍色之發光二極體3,並使合計6個之發 光二極排列成一列之單格4,依據各色之發光二極體之個 數加以圖案(pattern)標記’則成為圖5所示之(2G 2R 2B)。 亦即’(2G 2R 2B)係表示將綠色與紅色與藍色各2個合計6 個之圖案當作基本單位。因此,如圖6所示,將3個上述之
基本單位之單格4連續地連接之情形’其記號為3 *(2G 2R 2B) ’若依據發光二極體之個數加以圖案標記,則表示為 (6G 6R 6B)。 其··人,說明背光裝置20之光源2 1中發光二極體之連接關 係。 光源21,如圖7所示,係以前述之發光二極體之基本單 位(2G 2R 2B)之3倍當作】個之中間單位(0G 6R 6B),而此 中間單位(6G 6R 6B)係對於畫面配置成水平5行、垂直4列 之矩陣狀《其結果,合計共配置有36〇個之發光二極體。 此外’此等之中間單位(6G 6R 6B)係於晝面之水平方向 以電性方式連接。如上述,由於中間單位(6G 6B)係於 晝面水平方向以電性方式連接,背光裝置20之光源21中, 如圖8所* #列於畫面水平方向之發光二極體係以串聯 方式連接’且於水平方向以串聯#式連接之複數之發光二 極體群3 0形成有複數個。 再者’於背光裝置2G中,設置有於水平方向以串聯方式 連接之複數之發光二極體群3G之每—個各自獨立之驅 I01844.doc -13· 1317445 係被提供予驅動相對應之發光二極體物之咖驅動電路 31° 此外’於背光裝置20中,如圖10所示,例如,設置有檢 測發光二極體群30之亮度或色度之光量感測器或色度感測 器33。雖圖1G中所揭示者係於與水平方向上以串聯方式連 接之發光二極體群30相對應之各垂直位置上設置有複數個 之亮度或色度感測器33 ’但除本實例以外,亦可藉由有效 地運用能使全體混色均#之擴散板等,以及使用將各個 LED之發光有效地完成混色之光學系統等方式,使亮度或 色度感測器33成為1個。此實例中,藉由亮度或色度感測 器33所;^測之免度或色度值,雖係揭示被流至驅動相對應 之發光二極體群30之LED驅動電路31者,但除本實例以 外,亦可藉由有效地運用能使全體混色均等之擴散板等, 以及使用將各個LED之發光有效地完成混色之光學系統等 方式’使亮度或色度感測器33成為1個。 其次,針對驅動水平方向上以串聯方式連接之發光二極 體群30之LED驅動電路31說明之。再者,LED驅動電路31 係經備置於背光驅動控制部180内。 圖12係揭示LED驅動電路31之電路構造實例。 LED驅動電路31包含直流對直流轉換器(DC_DC converter)41 '固定電阻(rc)42、場效應電晶體(Fet ; fieid effect transistor)43、脈寬調變(PWM)控制電路44、電容器 (condenser)45、取樣保持用場效應電晶體(sarnpie_and-hold FET)46、電阻47、以及保持定時(hold timing)電路48。 101844.doc -15- 1317445 DC-DC轉換器41係被輪入從圖2所示之電源1〗〇所產生之 直流電壓VIN,並將所輸入之直流電力加以切換而產生安 定化之直流之輸出電壓Vcc。DC_DC轉換器4〗係產生安定 化之直流之輸出電壓Vcc,以便從回饋端子Vf所輸入之電 壓與輸出電壓Vcc之電位差(Vref)成為固定值。 以串聯方式連接之發光二極體群3〇之陽極(抓〇心)側係介 由固定電阻(RC)而與!)^!;^轉換器41之輸出電壓Vcc之輸 出端相連接。此外’卩串聯方式連接之發k極體群30之 陽極側係介由取樣保持用FET 46之源極(s〇urce)·汲極 (drain)而與DC_DC轉換器4】之回饋端相連接。此外,以串 聯方式連接之發光二極體群3〇之陰極側係介由fet 43之源 極·汲極而與接地(groun(j)相連接。 FET 43之閘極(gate)被輸入從p WM控制電路料所產生之 PWM信號。FET a於PWM信號為〇N(通電)時,其源極· 汲極間成為ON,而於PWM信號為OFF(斷電)時,其源極· 汲極間成為OFF。因此,FET 43於PWM信號為⑽時供應 電流予發光二極體群30,而於PWM信號為〇FF時使流至發 光二極體群30之電流變為〇 ^亦即,FET牦係於pWM信號 為ON時使發光二極體群30發光,而於PWM信號為〇ff時 使發光二極體群30之發光停止。 PWM控制電路44係產生調整〇>^時間以及〇FF時間之能 率比(duty ratio)之雙值信號之PWM信號。卩貿河控制電路 被輸入藉由亮度感測器33所檢測之檢測值(光量值),並調 整PWM信號之脈寬,以便使從以串聯方式連接之發光二極 101844.doc -16- 1317445 體群30所發出之亮度與目標亮度值―致。亦即,卩丽控制 電路44係控制PWM信號,以便於藉由亮度感測器^所檢測 之檢測值(光量值)較目標亮度值少之情形,擴大⑽時之脈 寬以增加二極體群30之發光時間,而於較目標亮度值多之 情形,則縮小脈寬以減少二極體群3〇之發光時間。 電容器45係被設置於DC.DC轉換器41之輸出端與回饋端 之間。電阻47則係被連接於DC_DC轉換器41之輸出端與取 樣保持用FET 46之閘極。 保持定時電路48係被輸入PWM信號,於pwM信號之前 緣(丨eading edge)產生僅於特定時間成為〇]pF,而於其他之 時間則成為ON之保持信號(hold signal)。
取樣保持用FET 46之閘極係被輸入從保持定時電路銘所 輸出之保持信號。取樣保持用FET 46於於保持信號為〇FF 時,其源極•汲極間成為0N,而於保持信號為〇N時,其 源極•汲極間成為OFF。 如上述之LED驅動電路31中,電流iLED僅於從pWM控制 電路44所產生之PWM信號成為〇N2時間被流至發光二極 體群3〇。此外,由電容器45、取樣保持用FET 46、以及電 阻47構成取樣保持電路(sample_and_h〇ld cireuit)。該取樣 保持電路係於PWM信號為ON時,就發光二極體群3〇之陽 極(即輪出電壓VCC未被連接之固定電阻42之一端)之電壓 值進行取樣,而流至DC-DC轉換器41之回饋端。DC-DC轉 換器41係基於回饋端所輸入之電壓值,使輸出電壓Vcc安 疋化,因此,被流至固定電阻Rc42以及發光二極體群3〇之 i0i844.doc •17· 1317445
Vf 回饋端子 Vref 目標電壓值 1 紅色之發光二極體 2 綠色之發光二極體 3 藍色之發光二極體 4, 4-1, 4-2 單格 10 彩色液晶顯不面板 11 TFT基板 12 對向電極基板 13 液晶層 14 信號線 15 掃描線 16 薄膜電晶體 17 像素電極 18 對向電極 19 彩色濾色鏡 20 背光裝置 21 光源 22 波長可調性濾光鏡 30 發光二極體群 31 LED驅動電路 32 溫度感測器 33 免度感測器 41 直流對直流轉換器 101844.doc -23- 1317445 42 固定電阻 43 場效應電晶體 44 脈寬調變控制電路 45 電容器 46 取樣保持用場效應電晶體 47 48 49 50 100 110 120 130 140 150 160 170 180 200
電阻 保持定時電路 目標值控制電路 表格 彩色液晶顯不裝·置 電源部 X驅動益 Y驅動器 輸入端子 RGB程序處理部 視頻記憶體 控制部 背光驅動控制部 驅動電路 101844.doc -24-
Claims (1)
13 1 $2^^3634號專利申請案 「___ _ 十、申請專利範圍: 日如更 ·.丨· 一種背光裝置,其係設置於顯示裝置之背面侧者, ~ 徵在於包含: w 具有以串聯方式連接之複數之發光二極體之照明 元、 、、早 • 與各上述照明單元相對應所設置之驅動各上述照明單 元之發光二極體之驅動部、及 檢測各上述照明單元之溫度之溫度檢測部; • 各上述照明單元係被分別地配置於發光二極體成為特 疋之溫度區域之位置上, 上述驅動部係藉由脈寬調變而調整流至照明單元之發 光二極體之電流以使從各照明單元所發出之光至少其亮 度成為均一,且對電流之峰值之改變進行控 在紅、綠、藍上之解像力為大致相同;A 依據藉由上述溫度檢測部所檢測之各照明單元之溫 度,調整流至照明單元之發光二極體之電流之峰值。 • 2·如請求項1之背光裝置,其中,上述驅動部係按照利用 二述溫度檢測部所檢測之各照明單元之溫度,就每一個 °單元調整流至發光二極體之電流,以便於照明單元 有溫度變化之情形’除上述之亮度外,色度亦成為均 — 0 月求項1之老光裝置,其中,各上述照明單元設置於 顯示裝置之背面側時,排列於畫面之水平方向之發光二 極體係以串聯方式連接而配置。 101844-980430.doc 1317445 4. 如清求項1之背光裝置,其中,上述溫度檢測部係對應 於設置有溫度感測器之位置之照明單元之溫度,並基於 來自預先保持有未設置溫度感測器之照明單元溫度之記 憶體之資訊,檢測未設置溫度感測器之照明單元之溫 度。 5. 如吻求項1之背光裝置’其進一步包含檢測從各上述照 明單元之發光二極體所發出之光之亮度之光檢測感測 器,而上述驅動部係就每一個照明單元調整流至發光二 極體之電流,以便使從各照明單元所發出之光至少其亮 度成為均一。 6. —種顯示裝置,其特徵在於包含: 非發光之透過型之顯示部、 設置於上述顯示部之背面側且具有以串聯方式連接之 複數之發光二極體之照明單元、 與各上述照明單元相對應而設置之驅動各上述照明單 元之發光二極體之驅動部、以及 檢測各上述照明單元之溫度之溫度檢測部; 各上述照明單元係被配置成所有發光二極體位於大致 相同之溫度區域; 上述驅動部係藉由脈寬調變而調整流至照明單元之發 光一極體之電流以使從各照明單元所發出之光至少其齐 度為均一,且對電流之峰值之改變進行控制以使脈宽在 紅、綠、藍上之解像力為大致相同;且 依據藉由上述溫度檢測部所檢測之各照明單元之、、w 101844-980430.doc 1317445 又調整/;,L至照明單元之發光二極體之電流之峰值。 .如”月求項6之顯不裝置’其中,上述驅動部係按照利用 上述溫度檢測部所檢測之各照明單元之溫度,就每—個 照明單7C調整流至發光二極體之電流,以便於照明單元 有溫度變化之情形’除上述之亮度外,色度亦成為均 —· 〇 8’如咐求項6之顯示裝置,其中,各上述照明單元設置於 顯示裝置之背面側時,排列於晝面之水平方向之發光二 極體係以串聯方式連接而配置。 9. 如#求項6之顯示裝置,其_中,上述溫度檢測部係對應 於設置有溫度感測器之位置之照明單元之溫度,並基於 來自預先保持有未設置溫度感測器之照明單元溫度之記 憶體之資訊,檢測未設置溫度感測器之照明單元之溫 度。 10. 如明求項6之顯示裝置,其進一步包含檢測從各上述照 明單元之發光二極體所發出之光至少其亮度之光檢測感 測器而上述驅動部係就每一個照明單元調整流至發光 二極體之電流’以便使從各照明單元所發出之光至少其 亮度成為均一。 11. 如凊求項6之顯示裝置,其中包含將從各上述照明單元 之各色之發光二極體所發出之各個光混色成同樣之光學 系統, 而上述驅動部係以將檢測亮度或色度之光檢測感測器 捉取一個作為代表值,並就每一個照明單元調整流至發 101844-980430.doc 1317445 光二極體之電流,以便使全體同樣地變化,且使從各照 * ' 明單元所發出之光之亮度或色度成為固定。
101844-980430.doc •4-
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