TWI313442B - Pixel driving circuit with threshold voltage compensation - Google Patents
Pixel driving circuit with threshold voltage compensation Download PDFInfo
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- TWI313442B TWI313442B TW094126191A TW94126191A TWI313442B TW I313442 B TWI313442 B TW I313442B TW 094126191 A TW094126191 A TW 094126191A TW 94126191 A TW94126191 A TW 94126191A TW I313442 B TWI313442 B TW I313442B
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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
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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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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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
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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
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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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
- 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
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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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
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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
- G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
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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]
- G09G3/3266—Details of drivers for scan electrodes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- 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)
- Shift Register Type Memory (AREA)
Description
1313442 九、發明說明: 【發明所屬之技術領域】 ‘ 本發縣有關於顯示雜的電路,且_是有關於可補償臨界電壓與 電源供應的晝素驅動電路。 /' 【先前技術】 主動矩陣式有激發光二極體顯示器為正在萌芽的下一代平面顯示器, 與主動矩陣式液晶顯示器相較下,主動矩陣式有激發光二極體顯示=許 錢點’諸如較高的對比、較寬的制、不„光而有較_模組厚度"、 較低的功耗以及較低的成本,主動辦式液日日日顯示器係由電壓驅動,而主 動矩陣S有激發光二極體顯示II需要φ電流原來驅動電致發光元件,電致 發光元件的錢正比於通過的電流,電流量賴異對於主動矩陣式有激發 光-極體顯示n的亮度均樣有貞面的影響,因此,晝素驅動電路的品質 對於晝質非常重要。 αβ 第1圖繪不—傳統主動矩陣式有激發光二極體顯示器之2T1C(兩個電 晶體與一個電容)的晝素驅動電路,當一信號SCAN導通-電晶體M1時, 圖中以Vdata所示的資料會被載入一 p型電晶體M2的閘極,並儲存於電容
Cst内因此,會有一固定的電流驅動電致發光元件發光,在典型的主動矩 陣式有激發光二極體顯示器巾,電流騎常是—個p型薄膜電晶體(如第丄 圖中的M2)’閘極為—資料電壓%·所控制,且錄與祕分別連接至% ”電致發光元件,如第丨圖所示,電致發光元件的亮度相對於 的關係: 亮度0c電流oc (F必-匕ω—·)2 其中’ Vth為電晶體Μ:的臨界電壓,Vdd為電源供應電壓。 由於在低溫多晶矽製程中,低溫多晶矽薄膜電晶體通常會有臨界電壓 Vth的變,、右臨界電壓施沒有經過適當的補償,主動矩陣式有激發光二 0773-A30950TWF(5.0) 1313442 極體顯不器便會有不如的現象產生,再者,在電源線上的麟也會產生 亮度不均勻的問題’為了解決此一問題,建構一可補償臨界電壓驰與電 源供應Vdd的晝素電路變成了改善晝f的重要課題。 【發明内容】 本發明之實麵揭露—可補償臨界電壓與電源供應的晝素電路,會影 θ,旦素電的輸人籠(諸如:關臨界㈣、電源供應電壓或兩者皆有) 之變/、可被補彳I ’且驅動電流會比較少受到電路設計的影響,甚至與施 或Vdd無關’因此’每—晝素的亮度皆與她或观無關。 ,據本發日狀可補償轉電壓與魏供應的晝素電路實施例包括—儲 存電谷#移電路、一驅動元件以及一開關電路,轉移電路將一資料信 號或-可變參考錢轉移至存電容的第—祕,驅動元件有一第一端 點雛至固定電位,有—第二端_接至該儲存電容的第二節點, 並有一弟二端點輸出一驅動電流, :浞’開關電路耦接至該驅動元件的該第三媿
:丁贫所附圖式,作詳細說明如下: 【實施方式】
圖’畫素驅動電路包括一儲存電容Cst、— I興電源供應的晝素 —轉移電路210、 〇773-A30950TWF(5.0) 6 1313442
驅動電晶體221以及一開關電路220。轉移電路210耦接至該儲存電容匸过 的第-節點A,並將-資料信號Data或-可變參考信號Vd轉移至該儲存 電容的第-節點,可變參考信號%可以是—脈衝參考信號,驅動電晶體^ - P型金氧半電晶體,有-第-端點(源極你接至一第一固定電位,有一第 二端點(閘極)叙接至該儲存電容Cst的第二節點B,更明確地說,該第一固 定電位為電源供應電壓VDD,開關電路22〇 _至該驅動電晶體221的第 三端點(祕),開關電路220可被用以使驅動電晶體221成二極體連接 (d1〇de-connected) ’ 一顯示元件乩輕接至開關電路22〇,較佳而言,顯示元 ^ EL可以是一電致發光元件,此外,顯示元件既的陰極輕接至一第; 定電位’更明確地說’該第二固定電位為—接地電位 依據本發明此-實施例之轉移電路則包括第一電晶體叫 =犯’如第2圖所示’在第2圖中,該第一與第二電晶體分別為二 型金氧半電晶體,第一電晶體211有一第一端點(源極)接收 〜貝科錢Data,其第二端點(閘極)與第三端峨極)分別連接至一第 聪線S咖以及儲存電容⑸的第一節點A,第二電晶體加的第—端 ^收了變參考信號Vd,其第二端點_)與第三端點(祕)分別連接
第est _’更明確地說’ 曰體為ί日前 電晶體213為薄膜電晶體,較佳而言,該等薄膜電 ittr體,可提供較高的電流驅動能力,當第—掃聪線⑽ 第=γτ __210將,信號_移轉到儲存電容㈣ 變夫考伴v r艟弟二掃晦線scanx被拉到高準位時,轉移電路训將可 I考« VD移轉至儲存電容Cst的該第—節點A。
本發明此—實施例之開關電路22〇包括第三電晶體奶轉四電 二二如第2圖所示,該第三與第四電晶體分别為- N型金氧半虚一 P 乱的陽第㈣㈣223(源極)連接至該顯示元件 陽才而其第二端點(間極)與第三端點(沒極)分別連接至一第二掃瞒線 〇773-A3095〇TWF(5.〇) 7 1313442
ScanX以及該驅動電晶體221的該第三端點(没極),第四電晶體有一第一端 *點(汲極賊至該驅動電晶體221與該第三電晶體223的該等第三端點(没 ”極)’其第二端點(源極)連接至該儲存電容Cst的該第二節點B與該驅動電 "晶體221的該第二端點(閘極),並有一第三端點(閉極)連接至一第一掃猫線 • Scan ’更明確地說’第三電晶體223與第四電晶體225為薄膜電晶體,較 佳而言’該㈣膜電晶體為多㈣_電晶體,可提供較高的電流驅動能 力’當第-掃猫線Scan被拉至低準位時,開關電路22〇内的第四電晶體225 會使得驅動電晶體221成為-二極體連接(_e__ected)的電晶體。 • f 3圖繪示第2圖所示之晝素驅動電路之第-與第二掃猶信號
Scan、SeanX以及可變參考信號Vd的時序圖,縣晝素驅動電路的前一發 光模式’當可變參考信號VD被拉至高準位且掃晦信號^與ScgnX維持 在高準位’第2 ®内的晝素驅動電路會操作於—放電模式观,在此放 電模式中’-高準位的可變參考信號Vd會輸入到儲存電容❻的第一節點 A ’使得電晶體223與225導通,儲存在儲存電容Cst内的電荷便可在放電 模式中釋放,儲存電容Cst的放電可確保二極體連接的驅動冑晶體221與第 四電晶體225在後續步驟中的正常操作。 接續儲存電容(:_放電之後,掃鱗Sean#SeanX;^至低準位, ^然後畫素驅動電路200會進入掃腺模式304,當第-與第二掃猫線Scan與 ScanX被拉至低準位,電晶體211與225導通而電晶體213與223關閉了 由於電晶體211與225導通,儲存電容Cst的第一節點A之電壓等於資料 L號Data的電麼Vdata’且儲存電谷Cst的第二節點b之電壓等於vdd_vth, 其中,Vth為驅動電晶體221的臨界電壓,因此儲存在儲存電容的跨壓為 Va-VB=Vdata-Vdd+Vth。 ,、'、 §第一知線Scan與弟一猫線ScanX被拉至高準位時,掃晦模式304 結束,且畫素驅動電路200會進入發光模式306,此外,在掃瞄模式3〇4結 束的時候,參考信號vD被拉至低準位,由於第一掃瞄線Scan維持在高準 0773-A30950TWF(5.0) 8 1313442 位’而第二掃瞄線ScanX也被拉至高準位’電晶體211與225關閉,而電 ' 晶體213與223導通,由於vd被拉至低準位,電晶體213會導通,儲存電 容Cst的第一節點A之電壓VA也會被拉至低準位,由於儲存電容的跨壓無 • 法瞬間改變,因此儲存電容Cst的第二節點b之電壓Vb也就變為Vdd— ' —Vth,流經顯示元件的電流正比於(Vsg—Vth)2,也就是正比於vdata2,因 此流經顯示元件的電流與驅動電晶體221的臨界電壓vth以及驅動電晶體 221的電源供應Vdd無關,前述晝素驅動電路的操作會一再重複,以控制 畫素的發光。 _ 帛4圖顯示傳統的與依據本發明實施例之畫素驅動電路的電流變異相 對於臨界電M vth變異的比例,以臨界電壓為14伏特作為基準,在傳統的 畫素驅動電路巾,當臨界電壓麟丨.4伏特時,電流的變異量非常顯著,而 在依據本發明實施例之晝素驅動電路中,其電流變異量與傳統的畫素驅動 電路相較下可說是微乎其微。 第7圖顯不依據本發明-第二實施例之晝素驅動電路,其結構與第2 圖户^之畫素驅動電路相似,不同處在於第7圖中的第一掃猫線U與第 -掃瞎線SeanX互相連接,並為相同信號8哪所控制,第8圖繪示第7圖 所不之畫素驅動電路的掃瞎線信號Scan、ScanX與可變參考信號%的時序 >第Π Η顯示依據本發明一第三實施例之畫素驅動電路,其結構近似於 第2圖,第口 12圖為第η圖所示畫素驅動電路之掃㈤線信號⑽ 、^考彳“虎VD的%序圖,第2與丨丨目的差異在於被第二掃瞎線控制的 電晶體為不同的類型,因此,如第12圖所示,第二掃鱗的信號也隨之反 轉t使第11圖所不的晝素驅動電路得以運作,於此實施力中,亦有三種 操作核式/、操作類似於第—實施例所描述,且無須進—步闡述,便可為 熟習此技藝人士所瞭解。 處本毛月亦提供參考信號產生器的實施例,參考信號產生器的一 0773-A30950TWF(5.0) 1313442 實施例包括兩個非及閘930、950以及兩個及閘910、970,如第9圖所示, ' 信號VSR1與VSR2被送入第一及閘910的兩輸入911與913,其中VSR1 與VSR2代表閘極驅動電路中垂直位宜暫存器所產生的信號,該第一及閘 嬅 910的輸出信號與第一致能信號ENBV1分別被送至第一非及閘930的第一 * 輸入931與第二輪入933,並產生出第一掃瞄信號ScanX,第一及閘910的 輸出信號與致能信號ENBV卜ENBV2被送至第二非及閘950的輸入951、 953與955,因此第二非及閘950產生一第二掃瞄信號Scan ,第一及閘910 的輸出信號與第二致能信號ENBV分別被送至第二及閘970的第一輸入971 • 與第二輸入973,因而可提供一參考信號vD。 第10圖顯示參考信號產生器的另一實施例,此一參考信號產生器實施 例包括兩非及閘110、12〇以及一及閘丨3〇,信號VSR1、VSR2、ENBV1 與ENBV2分別被送至第二非及閘12〇的輪入121、123、125與127,因此 第二非及閘產生一第二掃瞄信號Scan,信號VSR1、VSR2與ENBV2分別 被送至及閘130的輪入ι31、133與135,因此產生出參考信號Vd。 此外,本發明之實施例亦提供一顯示面板,如第6圖所示,顯示面板 600包括一畫素陣列61〇與一控制器64〇,畫素陣列包括複數個前述之之晝 素驅動電路,控制器麵接至該晝素陣列,並控繼存電容、轉移電路、驅 動元件以及開關電路的操作,此外,如第13圖所示,本發明亦提供一電子 裝置700,包括如第6圖所示之顯示面板。 第5圖繪不依據本發明一實施例之驅動顯示元件的方法,該驅動方法 起始於於-放f模式巾對—齡電容進行放電(轉训),放電模式發生於 掃猫模式之高’並於參考信號第一次切換時開始,並於一掃聪模式開始時 結束’其後,在掃晦模式中—資料信號、該驅動元件221的一臨界電壓以 及-固定電壓被載入該儲存電容(步驟MO),接著,將載入的該資料信號、 該臨界電壓與固定電壓執合至該驅動電晶體,以提供一與臨界電麼無關的 驅動電流給該顯示元件(步驟53〇),更明碎地說,依據本發明實施例之顯示 0773-A30950TWF(5.0) 10 1313442 7為-電致發光元件,當參考信號的第二次切換發生時,掃 東,且晝素驅動電路便進入發光模式。 、飞、、·° % 較佳而言,參考信號的第二次切換發生於掃瞄模式妗束之吁一 ,的晝質,此外,驅動電晶體的閘極連接至儲存電二且其=極== 固定電位,更明確地說,該固定電位為一電源供應取立。 丧主 〃本發日狀實補提供-可浦料賴與_供_晝素轉 壓、電源供應或兩料有的變異可被補償,使得鶴電流與臨界電 太或電源供應游因此每-晝·亮度也賴臨界龍或電源供應益關。
雖穌發明已峰佳實施觸露如上,财並相嫌定本發明、,任 可熟習此技藝者,在不麟本發明之精神和翻内,當可作些許之 潤飾,因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。/、 【圖式簡單說明】 第1圖繪示一傳統主動矩陣式有激發光二極 體與一個電容)的畫素驅動電路。 第2圖顯示依據本發明實施例之一可補償臨界電塵與電源 驅動電路結構圖。 —$
體顯示器之2T1C(兩個電 曰曰 弟圖緣示第2圖所示之晝素驅動電路之第一與第二掃瞎線信號 Scan'ScanX以及可變參考信號%的時序圖。 第圖』示傳、.先的與依據本發明實施例之畫素驅動電路的電流變里相 對於臨界電壓Vth變異的比例。 八 第5圖繚示依據本發明一實施例之驅動顯示元件的方法。 第6圖為-區塊示意圖,顯示依據本發明一實施例之顯示面版的結構。 第7圖顯示依據本發明另一實施例之晝素驅動電路。 第8圖緣不第7圖所示之晝素驅動電路的掃⑮線信號&姐' &被與 可變參考信號VD的時序圖。 0773-A30950TWF(5.0) 11 1313442 第9圖為依據本發明一實施例之參考信號產生器之結構的示意圖。 - f 10圖為依據本發明另-實施例之參考信號產生器之結構的示意圖。 • 第11圖為依據本發明另一實施例之畫素驅動電路之電路圖。 • 第12圖鱗U圖所示晝素驅動電路之娜線信號s咖、以及 , 參考信號Vd的時序圖。 第13圖為-包括第6圖所揭露之顯示面板的電子裝置示意圖。 【主要元件符號說明】
Cst〜儲存電容; 210〜轉移電路; 221〜驅動電晶體; 220〜開關電路; A〜第一節點; Data〜資料信號; VD〜可變參考信號; B〜第二節點; VDD〜電源供應電壓; EL〜顯示元件; Vss〜接地電位; 211〜第一電晶體; 213〜第二電晶體; Scan〜第一掃目苗線; ScanX〜第二掃瞄線; 223〜第三電晶體; 225〜第四電晶體; 302〜放電模式; 304〜掃晦模式; 306〜發光模式; 930、950〜非及閘; 910、970〜及閘; VSR卜VSR2〜_驅树路”直健暫存^所產生 91 卜 913、93 卜 933、951 、953、955、971、973〜輪入; ENBV1〜第一致能信號; ENBV2〜第二致能信號; 110、120〜非及閘; 130〜及閘; m、123、125、127、131、133、135〜輸入; 510〜對一儲存電容進行放電; 520〜將U定供應電㈣與該請信號以及該驅動元件的該臨界 0773-A30950TWF(5.0) 12 1313442 ' 電壓載入該儲存電容; ’ 530〜將該載入的第一固定供應電壓、該資料信號以及該臨界電壓耦合 至該驅動元件; • 610〜晝素陣列; « 640〜控制器; 700〜電子裝置。
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Claims (1)
- D 勒4126191 ”請專概圍修正本 十、申請專利範圍: L一種晝素驅動電路,包括: ‘儲存電容,有一第一與一第. 修JL 日期:98.2.2f 了阵>月,修正替換頁 -節點; 一轉移電路,耦接至該儲存電容的 — 信號或一可變參考信號轉移糊存電麵=節Γ轉賴將一資料 一驅動元件,有-第—端點_至_第—固 接至該齡t料該帛H並有 ·’ —開關電路,雛至該驅動元件的點輸出一驅動電流;以及 節㈣件的1 2轉二端點與該儲存電容的該第二 作於轉移至兮式中’該轉移電路係將具有—高準位之該可變參考 轉移電路係將該細讀轉移至該第描模式中,該 動元件成二_賴,並錄H錄=並且賴__使得該驅 位之該可變參考信號轉移放^切’轉移電路鑛具有一低準 輸出至-顯示元件。’並且該開關電路係將—驅動電流 p型=ΓΓ第1項所述之咖動電路,其中,該驅動元件為一 為-第1細之咖騎路,料謂參考信號 4.如申請專利範圍第!項所述之 至該_的該*-節:: 第一電曰曰體,有-第一端點接收該可變參考 接至-第二掃喊,並有—第三端軸接至該儲存電容的有——第:端點連 14 1 5.如㈣糊_4叙畫她魏,射,5:^。 晶體分別為-P型與N型金氧半電晶體。 "第,、第—電 2 ·如申咖娜4销物細魏,㈣,該第-與第二電 0773-A30950TWF1(20081230) I3B442 納冬%冲日修 <吏.)止替換 晶體皆為p型金氧半電晶體。 *-- 7. 如申請專利範圍第4項所述之晝素驅動電路,其中,該第一與第二電 晶體為多晶矽薄膜電晶體。 8. 如申請專利範圍第5項所述之晝素驅動電路,其中,該第一與第二掃 目苗線有相同極性的脈衝。 9. 如申請專利範圍第6項所述之晝素驅動電路,其中,該第一與第二掃 瞄線有不同極性的脈衝。 10. 如申請專利範圍第8或9項所述之晝素驅動電路,其中,該第二掃 瞄線有一脈衝,其結束時間比該第一掃瞄線晚。11. 如申請專利範圍第5項所述之畫素驅動電路,其中,該第一與第二 掃瞄線互相連接。 12. 如申請專利範圍第1項所述之晝素驅動電路,其中,該開關電路包 括: 一第三電晶體,有一第一端點連接至該顯示元件,有一第二端點連接 至一第二掃瞄線,並有一第三端點連接至該驅動元件的該第三端點;以及 一第四電晶體,有一第一端點耦接至該驅動元件與該第三電晶體的該 等第三端點,有一第二端點連接至該儲存電容的該第二節點與該驅動元件 φ 的該第二端點,並有一第三端點連接至一第一掃瞄線。 13. 如申請專利範圍第12項所述之晝素驅動電路,其中,該第三與第四 電晶體分別為一 N型與P型金氧半電晶體。 14. 如申請專利範圍第12項所述之畫素驅動電路,其中,該第三與第四 電晶體皆為P型金氧半電晶體。 15. 如申請專利範圍第12項所述之晝素驅動電路,其中,該第三與第四 電晶體為多晶矽薄膜電晶體。 16. 如申請專利範圍第1項所述之晝素驅動電路,其中,該第一固定電 位為一電源供應電位。 0773-A30950TWF1 (20081230) 15 ϊ31*3442 、楚級餐錢4 17. 如申請專利範圍第1項所述之畫素驅動電路,其中,該顯 .-電致發光元件。 〜不疋件為 18. 如申请專利範圍第1項所述之晝素驅動電路,更包括一泉考 生器耦接至該轉移電路。 °説產 19. 如申請專利範圍第18項所述之畫素驅動電路,其中,該表 生器包括: 〜哼1舌號產 一第一及閘,有兩輪入接收來自垂直位移暫存器的輸出信號, —及閘產生一輪出信號; ^ μ第 % 一第—非及閘’有一第一輸入接收來自該第-及閘的該輪出信號,並 有-第二輸入接收一第—致能信號,且該第一非及閑產生一第 給該第m 田1s#u -第二非及閘’有三個輸人’分別接收來自該第—及閘的輸出信號、 該第-致能信號與-第二致能信號,且該第二非及閘產生一第° = 給該第一掃瞄線;以及 田=… -第二及閘,有-第―輸人接絲自該第—及_該輸出信號,並有 —第二輸入接收該第二致能信號,且該第二及閘產生一參考信號。 20. 如申請專利範圍帛1S項所述之晝素驅動電路,其中,該參考 生器包括: ^ μ -第-非及閘’有兩輸人接絲自垂直位移暫存㈣信號,並有一第 三輸入接收-第-致能信號,且該第—非及閘產生—第__躺信號信號仏 該第二掃瞄線; b -第二非及閘’有兩輸人接絲自垂纽移暫存㈣信號,並有兩輸 入分別接收該第-致能信號與-第二致能信號,該第二非及閘產生一第二 掃瞄信號給該第一掃瞄線;以及 -及閘,有兩輸人接收來自垂直位移暫存器的信號,並有—第三輸入 接收該第二致能信號,該及閘產生一參考信號。 . 〇773-A30950TWF1(20081230) 16 1313442 21.—種驅動顯示元件的方法 替換買 容,該方法包括:牛的方法,摘不元件有一驅 用===輪替高雜之—參考嫩—儲存電容, ㈣:=『動元件的-臨界電•該 電容;以及 雄的電私加具有一低準位之該參考信號至該儲存 -杜將載t的3讀料錢、該供應響、與舰界電綠合至該驅叙 几以提供-與臨界電壓無關的驅動電流給該顯示元件。 22.如申請專利範圍第21項所述之驅動顯示元件的方法,其中: 的該臨界電壓一 載入該儲電ΓΓ與韻抖域以及該驅動元件 及該===*:=供細亦與_麵號以 23’如申凊專利範圍第22項所述之驅動顯示元件的方法,立中,在該載 ==容該儲存電容的放電步驟起始於該以—高準位的科信號施加於 24.如申請專利範圍第22項所述之驅動顯示元件的方法,其中,該載入 〜起始於掃晦仏號施加於一開關元件,以使該資料信號得以施加於該 儲存電容。 、::」5·如中請專利翻第21項所述之驅動顯示元件的方法,將載入的該資 :u該6。界電壓與§細疋信號耦合至該驅動元件的步驟起始於以一低 準位的該參考信號施加於該儲存電容之後。 26. 如申請專利範圍第24或25項所述之驅動顯示元件的方法,其中, 遠參考信餘透過―M元件施加賊齡電容前改難邏輯狀態。 27. 如申請專利範圍第21項所述之驅動顯示元件的方法,其中,該驅動 〇773-A30950TWF1(20081230) 17 B13442 v月;f修(fc)止料㈣ 心牛有-閘極連魅該儲存電容,並有一源 ^—-一^— 28. 如申請專利範圍第21項所述之驅動顯示元制方^電壓。 供應電壓為-電驗應電位。 其巾,該固疋 29. 如申請專利範圍第21項所述之驅動顯示元件的方法,其中,該顯示 元件為一電致發光元件。 30. —種顯示面板,包括··—晝素陣列包括如申請專利範圍第1項所述之畫素驅動電路;以及 一控制器’搞接至該畫素陣列,以控制該儲存電容、該轉移電路、該 驅動元件以及該開關電路的操作。 31. —種電子裝置,包括如申請專利範圍第30項所述之顯示面板。0773-A30950TWF1(20081230) 18
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US11/173,820 US7616177B2 (en) | 2004-08-02 | 2005-07-01 | Pixel driving circuit with threshold voltage compensation |
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TWI413053B (zh) * | 2009-10-09 | 2013-10-21 | Innolux Corp | 平面顯示裝置及其驅動方法 |
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TW200606781A (en) | 2006-02-16 |
EP1624437A3 (en) | 2009-07-15 |
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KR100734808B1 (ko) | 2007-07-03 |
KR20060048924A (ko) | 2006-05-18 |
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US20060023551A1 (en) | 2006-02-02 |
EP1624437A2 (en) | 2006-02-08 |
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