TWI302281B - Display unit, display array, display panel and display unit control method - Google Patents
Display unit, display array, display panel and display unit control method Download PDFInfo
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- 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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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- 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
- G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
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- 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
- G09G2320/043—Preventing or counteracting the effects of ageing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Description
^ 1302281 九、發明說明: 【發明所屬之技術領域】 本lx明係有關於一種顯示單元;尤指適用於有激發光顯示 裳置之顯示單元。 【先前技術】 .第1圖係表習知有機發光顯示(organic light emitting ^ splay ) ®板示意圖。面板i包括資料驅動器iq、掃描驅動 口口 12以及顾不陣列丨4。資料驅動器丨〇控制複數資料線Μ1至 ,且掃描驅動11 12控制複數掃描線Sid SL·。顯示陣列14 疋,相f交錯,資料、線Dll至Dln以及掃描線Sh至儿所形成, 且每-交錯之資料線和掃描線形成一個顯示單元,例如,資料 線〇1!和掃描線Sll形成顯示單元1〇〇。如圖所示,顯示單元 100(其他顯示單元亦㈣)的等效電路係包括開關電晶體 T10、儲存電容Cs卜驅動電晶體T11以及有機發光二極體, 其中驅動電晶體ΤΙ 1為PMOS電晶體。 掃描驅動器12依序送出掃描信號至掃描線Sh至儿,而 使在同#間僅開啟某一列上所有顯示單元之開關電晶體,而 關閉其他列上所有顯示單元之開關電晶體。資料驅動器W則 是根據待顯示的影像資料,經由資料線D】,至队,送出對庶的 貧料訊號(例如灰階值)到一列之顯示單元上。舉例來說,:掃 描驅動W2达出掃描信號至掃描線仏時,顯 : 關電晶體no導通,資料驅動器12則透過資料線di】將對= 貧料訊號傳送至顯示單元_中,且由儲存電容㈤來儲^ 科«之電麼。驅動電晶體T11則根據儲存電容⑶所儲存之 0632-A50419-TWf 5 ^ 1302281 電壓’以提供驅動電流Idl纟驅動有機發光二極體D1。 、由於有機發光二極體為電流_元件,驅動電流Idl之值 可決定有機發光二極體D1所發射之光亮度。確切而言, 電流Idl為驅動電晶體T11之汲極電流,即是驅動電晶體⑴ 之驅動能力,可由以下式子來表示: idl 二 k(vsgl + vthl)2, 其中’奶表示驅動電流Idl之值,灸表示驅動電晶體T11 之導電參數,V初表示驅動電晶體T11之源—閘極電壓Vsg之值, V/A1表示驅動電晶體ΤΙ 1之臨界電壓值。 在習知的有機發光顯示裝置中,每一顯示單元的電壓Vddl 以及Vssl皆耦接在一起,並由一外部電源系統提供。其中, 電壓Vddl係用來決定顯示單元之驅動電晶體的源—閘極電壓 Vsg之值,而電壓Vssl則係用來令驅動電晶體Tu保持操作在 飽和區内,故電壓Vssl需滿足Vds<Vgs—vthl之條件。然而,由 於電壓Vssl端與驅動電晶體T11間另有一有機發光二極體M, 因此,以顯示單元100為例,驅動電晶體T11的汲極電壓Vd 需滿足以下條件:Vd=Voled+Vssl,其中,v〇ied為有機發光二 極體D1的導通電壓(turn-on voltage)。由於有機發光二極體 的導通電壓值會隨著使用時間而增加,故在習知的有機發光顯 示裝置設計裡,外部電源系統提供之電壓Vssl值會考慮有機 發光二極體導通電壓之上升飄移值,也就是說電壓 Vssl=Vd-Voled-(D1之導通電壓飄移值),以使得驅動電晶體 T11的汲極電壓Vd滿足Vds<Vgs-Vthl。然則,有機發光二極 體之導通電壓上升係在一段時間之後才會產生,而且較佳之有 機發光二極體的導通電壓飄移現象並不明顯。因此,固定地提 供較大之電壓V s s 1將會造成整體功率的損耗浪費,尤其在較 0632-A50419-TWf 6 -1302281 小尺寸的產品裡,此一功率耗損更是不容忽視。 【發明内容】 * t鑑於上述情況,本發明提出一種顯示單元, ίΓΙ、一驅動電晶體以及一電壓源系統。此種發光二極體 ^,、、%極及-陰極。驅動電晶體具有—源極叫及極及 '源極接收第一電麼,沒極經由發光二極體轉接第二電舞, I::收弟二電壓。電壓源系統耦接至驅動電晶體之汲極,用 U根據驅動電晶體之汲極電壓’提供第二電麼。 用 =另提出—種陣列顯示器,包括複數資料線、複數 以及—電壓源系統。每—資料線彼此相互平行,且每-掃^ U 知。每—顯示單元對應—轉描線與魏線,縣-顯示單- 二光二極體、一驅動電晶體以及一電㈣系統。發光, 極匕具有—陽極及一陰極。驅動電晶體具有一源極、—沒: 極接收第_„,職經由發光二極 =接收第三電厂"厂輯統_ = 纽根據驅動電晶體之汲極電麼,提供第二« , 心μ -種顯示面板,包括複姆料線、複數掃 不料、-資料驅動器、-掃描驅動器以及 魏顯 此相互平行,且每_掃描線彼此相互平行 ==2一貧料線彼 線,用以輪出資料訊號至該等資料線。婦描驅動器資料 以輸出-掃晦訊號至該等掃猫線。每—顯 、〆㈣田線,用 線,且每—顯示單元包括-發光二極體、_驅動電r』·線與資料 =光:Γ有一陽極及一陰極。,_晶體具二 閉極,源極接收第-龍,汲極經由發光二極體輕 及極及 收第三龍°1㈣咖至彡、—陶象則—2據= 0632-A50419-TWf 7 -1302281 " 晶體之 >及極電壓’提供弟二電壓。 此外,本發明提出一種控制顯示單元之方法,顯示單元具有一 ~ 發光二極體及一驅動電晶體,此方法包括提供第一電壓至驅動 • 電晶體之源極、經由發光二極體提供第二電壓至驅動電晶體之 汲極、提供第三電壓至驅動電晶體之閘極、偵測驅動電晶體之 汲極電壓,以及根據偵測到之汲極電壓提供第二電壓至發光二 極體。 為使本發明之上述目的、特徵和優點能更明顯易懂,下文 特舉一較佳實施例,並配合所附圖式,作詳細說明如下。
I 【實施方式】 第2圖係表根據本發明之顯示單元示意圖。顯示單元200 包括開關電晶體T20、儲存電容器Cs2、驅動電晶體T21、有機 發光二極體D2以及電壓源系統P2。開關電晶體T20之輸入端 耦接資料線D2i,且其控制端耦接掃描線S2i,接收一掃描訊號。 儲存電容Cs2之一端耦接至開關電晶體T20,且其另一端耦接 參考電壓源Vref2。驅動電晶體T21,如一薄膜電晶體(thin fi lm transistor),其閘極柄接至儲存電容Cs2和開關電晶體 T20,且接收一資料訊號電壓Vdata,其源極耦接電壓源Vdd2, 而其汲極耦接有機發光二極體D2之陽極。有機發光二極體D2 之陰極耦接電壓源Vss2。電壓源系統P2耦接至驅動電晶體T21 之汲極以及有機發光二極體D2之陰極。其中,電壓Vss2低於 電壓Vdd2。 電壓源系統P2可為一直流對直流電源轉換器(DC-DC Converter),如型號MAXI733/MAX1734,用以根據驅動電晶體 T21之汲極電壓Vd,提供電壓Vss2。第3圖係顯示電壓源系統 0632-A50419-TWf 8 ^ 1302281 P2,其中,電晶體T21之没極輕接至一電阻之一端,電阻ri 之另一端耦接至電壓源系統P2之FB端與一電阻R2之一端,而 電阻R2之另一端則接地(ground)。電壓源系統p2之v〇ut輸出
而則係_接至有機發光二極體D2之陰極,提供電壓vss2。以直 机對直机電源轉換裔MAX1733/MAX1734為例,此直流對直流電 源轉換裔之Vout端與FB端電壓具有以下關係: VsS2=Vd(Rl/R2 + l)。因此,電阻R1以及R2之值可以依照設計 而要來做e周整,以根據偵測到之驅動電晶體T21的汲極電壓 Vd提供電壓Vss2至有機發光二極體卯之陰極,使得驅動電 晶體T21即使在有機發光二極體⑽導通電壓有上升之現象時, 仍可維持於操作在飽和區内,且電壓仏2之值可依照偵測到之 驅動電晶體T21的汲極電壓Vd調整,避免了整體功率之浪費。 本毛月之顯不單疋可組成如第2圖所示之有機發光顯示面 板,其結構與第1圖類似,在此不再贅述。值得注意的是,根 ^月之』不面板裡,可以依照第2圖之電路,僅測其内之 個或夕個顯不單元的驅動電晶體的汲極電壓,用以提供外部 系統來提供㈣VSS之參考使用。此外,在第2圖所i 之貫施例中,雷B雕τ〇彳么 電日日肢Τ21係以PM0S為例,在實際應用上可以 丽0S(如第 4 Hi -、,、 、'、 °不),或為製程相同或其他等效電路之元件。 、此外,如第5圖所示’本發明提供一種控制顯示單元之 法’此顯示單元且古 兀具有一發光二極體及—驅動電晶體,此方法包 0632-A50419-TWf 9 ^ 1302281 括提供一第一電壓至驅動電晶體之源極(S1)、經由發光二極體 提供一第二電壓至驅動電晶體之汲極(S2)、提供一第三電屋至 驅動電晶體之閘極(S3)、偵測驅動電晶體之汲極電壓(S4),以 及根據偵測到之汲極電壓,調整提供至發光二極體之第二電壓 (S5)。其中,提供之第二電壓可使得驅動電晶體操作於飽和區。
在步驟S5結束後可再回到步驟S4,再次偵測驅動電晶體之汲極 電屬,以再重複步驟S5,並依照偵測到之可能有變動的驅動電 晶體之汲極電Μ來調整提供至發光二極體之第二電壓。 '本發明雖以較佳實施例揭露如上,然其並非用以限定本發 :可:It自此項技藝者’在不脫離本發明之精神和範圍内, ^專更動與_,因此本發明之保護範圍當視後附之 申5月專利_所界定者為準。
0632-A50419-TWf 10 4302281 【圖式簡單說明】 、 第1圖為一習知有機發光顯示面板之示意圖。 ♦ 圖為根據本發明實施例所述之一顯示單元之示意圖。 第3圖為第2圖之電壓源系統之電路圖。 第4圖為根據本發明另一實施例所述之顯示單元之示咅 圖。 第5圖為根據本發明實施例所述之控制顯示單— 、 • 程圖。 凡之方法流 【主要元件符號說明】 1〜面板; 〜資料驅動器; 12〜掃描驅動器; 14〜顯示陣列; 100〜顯示單元; φ Csl〜儲存電容; D1〜有機發光二極體; Ι)1ι···Ι)1η〜資料線; 〜掃描線; 丁10〜開關電晶體; T11〜驅動電晶體;
Vrefl、Vddl、Vssl〜電壓源; 2 0 0〜顯示單元;
Cs2〜儲存電容器; 0632-A50419-TWf 11 ^ 1302281 D2〜有機發光二極體; D2r"D2n〜資料線; SC2〜電流源, S2l··· S2m〜掃描線; T20〜開關電晶體; T21〜驅動電晶體,
Vref2、Vdd2、Vss2〜電壓源; P2〜電壓源系統;
Rl、R2〜電阻; S1…S5〜步驟。
12 0632-A50419-TWf
Claims (1)
13〇2281 十、申請專利範圍: 1 · 一種顯示單元,包括··
接收第三電壓; 第三電壓;以及 收第. Γ甲]極,該源極接 二電壓,該閘極 用以根據該 電壓源系統,耦接至該驅動電晶體之汲極, 驅動電晶體之汲極電壓,提供該第二電壓。 2·如申請專利範圍第i項所述之顯示單元,其中該顯示單 凡另包括: 一開關電晶體, 包括接收一掃描訊號之一閘極、接收一資 料汛唬之一第一電極,以及耦接至該驅動電晶體之閘極之第二 電極;以及 一儲存電容,耦接於該開關電晶體之第二電極與一參考電 壓之間; 其中,該開關電晶體係根據該掃瞄訊號導通,且當該開關 電晶體導通時,將該資料訊號之電壓儲存於該儲存電容,以產 生該第三電壓。 3.如申請專利範圍第1項所述之顯示單元,其中該驅動電 晶體為一 PMOS電晶體。 0632-A50419-TWf 13 •1302281 厂/·如申請專利_第3項所述之顯示單元,盆中今第 I為正㈣mvDD),n 士厂 早凡/、中,亥弟1 恭爆_ ^ ~電壓為負極電壓(D且低於該第_ 包麼,該發光二極體之陽極 /弟 ^. 妾至°亥驅動電晶體之汲極,且兮 發先二極體讀轉㈣第二„。 亥 5_如中請專利範圍第i項所 曰粞从 < 硕不早凡,其中該驅動雷 日日肢為一 NM0S電晶體。 6. 如申請專利範圍第5項 口口 、、之頌不早兀,其中該第一電 £為負極電壓(Vss),該笫一 弟一電壓為正極電壓(Vdd)且高於該第一 電壓,該發光二極體之陰極_接 妾至°亥驅動電晶體之汲極,且該 發光一極體之陽極接收該第二電壓。 7. 如申請專利範圍第1項所述之顯示單元,其中該發光二 極體為一有機發光二極體。 8. 如申請專利範圍第1項所述 抑— 、汀XL之”、員不早疋,其中該驅動電 晶體為一薄膜電晶體。 9. 如申晴專利範圍第!項所述之顯示單元,其中該電壓源 系統為一直流對直流電源轉換器(DC_DC Convener)。 10· —種陣列顯示器,包括: 複數資料線,每一資料線彼此相互平行; 複數掃描線,每一掃描線彼此相互平行; 複數顯示單元,每一顯示I开科處 ._ 4不早兀對應一組掃描線與資料線,且 每一顯示單元包括: 0632-A50419-TWf 14 ^ 1302281 一發光二極體,具有一陽極及一陰極;以及 驅動電晶體,具有一源極、一汲極及一閘極,該源極接 - 收第電壓,该汲極經由該發光二極體耦接第二電壓,該閘極 接收第三電壓;以及 電壓源系統’耦接至少一驅動電晶體之没極,用以根據 該驅動電晶體之汲極電壓,提供該第二電壓。 如申請專利範圍第丨〇項所述之陣列顯示器,其中每一 Φ 顯示單元另包括: • 一開關電晶體,包括·· 一間極’麵接至一對應掃瞄線並接收一掃描訊號; 第一電極’耦接至一對應資料線並接收一資料訊號;以及 第二電極’耦接至該驅動電晶體之閘極;以及 一儲存電容,耦接於該開關電晶體之第二電極與一參考電 壓之間; # 其中’該開關電晶體係根據該掃瞄訊號導通,且當該開關 電晶體導通時,將該資料訊號之電壓儲存於該儲存電容,以產 生該第三電壓。 12·如申請專利範圍第10項所述之陣列顯示器,其中該驅 動電晶體為一 PM0S電晶體。 13·如申請專利範圍第ι2項所述之陣列顯示器,其中該第 一電壓為正極電壓(Vdd),該第二電壓為負極電壓(vss)且低於該 0632-A50419-TWf 15 •1302281 第電ι,该發光二極體之陽極耦接至該驅動電晶體之汲極, 且該發光二極體之陰極接收該第二電壓。 I4·如申請專利範圍第10項所述之陣列顯示器,其中,該 驅動電晶體為一丽os電晶體。 15·如申請專利範圍第14項所述之陣列顯示器,其中,該 第-電壓為負極電壓(Vss),該第二電壓為正極電壓(v—且高於 忒第電壓,该發光二極體之陰極耦接至該驅動電晶體之汲 極且"亥發光二極體之陽極接收該第二電壓。 16. 如申請專利範圍第1〇項所述之陣列顯示器,其中該發 光二極體為一有機發光二極體。 17. 如申請專利範圍第1〇項所述之陣列顯示器,其中該驅 動電晶體為一薄膜電晶體。 18·如申請專利範圍第丨〇項所述之陣列顯示器,其中該電 壓源系統為一直流對直流電源轉換器(DC-DC C〇nverte;r)。 19· 一種顯示面板,包括·· 複數資料線,每一資料線彼此相互平行; 複數掃描線,每一掃描線彼此互相平行; 一資料驅動器,墟於該等資料線,用以輸出資料訊號至 該等資料線; -掃描驅動器,_接於該等掃描線,用以輪出—掃晦訊號 至5亥寺知瞒線; 0632-A50419-TWf 16 * 1302281 複數顯不單元,每一顯示單元對應一組掃描線與資料線, , 且每一顯示單元包括: - 發光二極體,具有一陽極及一陰極;以及 驅動電晶體,具有一源極、一汲極及一閘極,該源極接 ^欠第 亡 電壓,該汲極經由該發光二極體耦接第二電壓,該閘極 則接收第三電壓;以及 電壓源系統,耦接至少一驅動電晶體之汲極,用以根據該 •驅動電晶體之汲極電壓,提供該第二電壓。 汝申明專利範圍弟1 g項所述之顯示面板,其中每一顯 不單元另包括: 一開關電晶體,包括: 閘極,耦接至一對應掃瞄線並接收該掃描訊號; 第〜電極,耦接至一對應資料線並接收該資料訊號;以及 第二電極,耦接至該驅動電晶體之閘極;以及 ® 一儲存電容,耦接於該開關電晶體之第二電極與一參考電 壓之間; 其中’該開關電晶體係根據該掃瞄訊號導通,且當該開關 電晶體導通時,將該資料訊號之電壓儲存於該儲存電容,以產 生該第三電壓。 21 ·如申請專利範圍第19項所述之顯示面板,其中該驅動 電晶體為一 PM0S電晶體。 0632-A50419-TWf 17 * 1302281 22.如申請專利範圍第21項所述之顯示面板,其中該第一 .電壓為正極電壓㈤,該第二電壓為負極電壓(Vss)且低於該第 - ’該發光二極體之陽極柄接至該驅動電晶體^及極,且 該發光二極體之陰極接收該第二電壓。 23·如申請專利範圍帛19J員所述之顯示面板,其中該驅動 電晶體為一 NM0S電晶體。 24·如申請專利範圍f 23項所述之顯示面板,其中該第一 _ 電[為負極電壓(Vss) ’該第二電壓為正極電壓(V⑽)且高於該第 ’该發光二極體之陰極孝禺接至該驅動電晶體之&極,且 該發光二極體之陽極接收該第二電壓。 仏如申請專利範圍第19項所述之顯示面板,其中該發光 二極體為一有機發光二極體。 %如申請專利範圍第19項所述之顯示面板,其中該驅動 電晶體為一薄膜電晶體。 ❿/ 27·如中請專利範圍第19項所述之顯示面板,其中該電壓 源系統為一直流對直流電源轉換器(dc_dc 。 28.—種控制顯示單元之方法,該顯示單元具有-發光二極 體及一驅動電晶體,該方法包括: 提供第一電壓至該驅動電晶體之源極; T由該發光二極體提供第二電壓至該驅動電晶體之沒極; 提供第三電壓至該驅動電晶體之閘極; 0632-A50419-TWf 18 * 1302281 偵測該驅動電晶體之汲極電壓;以及 根據該偵測到之汲極電壓,提供兮楚一 系弟一電壓至該發光二極 體。 29·如申请專利範圍第別項所述之控制顯示單元之方法, 其中提供該第二f壓係使得該驅動電日日日體操作於飽和區。
0632-A50419-TWf 19
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