TW201706978A - 顯示面板和畫素電路 - Google Patents
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Abstract
一種畫素電路,包括一發光元件、一驅動訊號產生單元和一開關單元。驅動訊號產生單元將一資料訊號與一參考訊號進行比較,而產生一脈寬調變驅動訊號,脈寬調變驅動訊號的狀態係依據資料訊號與參考訊號的比較結果而定。開關單元則電性連接一工作電源和該發光元件,並依據脈寬調變驅動訊號而產生一驅動電流驅動發光元件發光。
Description
本發明係關於一種畫素電路,特別是關於發光二極體顯示面板的畫素電路。
圖1A繪示為習知之類比驅動之有機發光二極體畫素的等效電路圖。請參照圖1A,習知之有機發光二極體(以下簡稱OLED)畫素10,可以適用在一顯示裝置,並且OLED畫素10包括電晶體102和電晶體104。其中,電晶體102的源極端電性連接至一資料線112,而閘極端則電性連接一掃描線114。另外,電晶體102的汲極端電性連接至電晶體104的閘極端,而電晶體104的汲極端和源極端分別電性連接一工作電源VDD以及一有機發光二極體106。
當掃描線114被致能時,電晶體102會被導通。此時,資料訊號電壓Vdata就會被電晶體102傳送到電晶體104的閘極端。因此,電晶體104會依據資料訊號電壓Vdata而被致能,並且依據工作電源VDD而產生一驅動電流I1來驅動OLED 106發光。由於在此電路中,驅動電流I1的大小是取決於資料電壓Vdata的電位,而並非定電流,因此容易讓電晶體104和OLED 106發生損壞,而造成元件的壽命較短。
圖1B繪示為習知之數位驅動之有機發光二極體畫素的等效電路圖。請參照圖1B,此習知OLED畫素14,也可以適用於一顯示裝置,並且此OLED畫素14包括驅動電路142、電晶體144和OLED 146。驅動電路142電性連接掃描線152和資料線154,並且驅動電路142還電性連接至電晶體144的閘極端。電晶體144的源極端電性連接至工作電源VDD,而汲極端則電性連接OLED 146。
圖1C繪示OLED畫素14的訊號時序圖。請合併參照圖1B
和圖1C,當掃描訊號Scan被致能時,驅動電路142會依據資料訊號電壓Vdata而輸出開關訊號SW至電晶體144的閘極端。在此,當開關訊號SW為低電位時,電晶體144會被啟動,而工作電源VDD所產生的驅動電流Idrive就會驅動OLED 146。由於開關訊號SW的電壓大小是固定的,因此驅動電流Idrive的大小也是固定的。
因此在數位驅動的OLED畫素中,OLED 146的亮度是與開關訊號SW的工作週期有關。由圖1B可知,當開關訊號SW的工作週期愈長,OLED 146的亮度愈低,反之,OLED 146的亮度愈高。然而,若是如圖1C所示,在一圖框F1中,開關訊號SW的工作週期非常長,例如是75%,此時,大約僅有1/4圖框F1時間中,OLED 146是被點亮。換句話說,將近3/4圖框F1時間中,OLED 146是熄滅的狀態。此時,當下一個圖框F2之時間內的掃描訊號Scan被致能時,顯示畫面就會發生閃爍(flicker)的現象。
習知要解決此閃爍現象的方式,就是加快掃描訊號掃描的頻率。然而,在上述的例子中,就需要將掃描訊號掃描的頻率增加4倍。這顯然是不切實際的作法,因為這樣的作法不但導致顯示裝置的耗能提升,並且使得電路設計更加複雜。此外,由於每一掃描線上的負載會有變化,因此當掃描訊號掃描的頻率增加時,會導致每一條掃描線後面的畫素可能來不及更新,除上述有機發光二極體畫素之外,一般發光二極體顯示面板亦具備上述現象。
因此,相較於習知技術而言,要如何解決LED面板閃爍的現象,已成為重要課題之一。
本發明之目的為提供一種顯示面板和畫素電路,可以解決因為畫素之工作週期過短而造成閃爍的現象。
為達上述目的,本發明提供一種畫素電路,包括一發光元件、一驅動訊號產生單元和一開關單元。驅動訊號產生單元係將一資料訊號與一參考訊號進行比較,而產生一脈寬調變驅動訊號,脈寬調變驅動訊
號的狀態係依據資料訊號與參考訊號的比較結果而定。開關單元電性連接一工作電源和發光元件,並依據脈寬調變驅動訊號而產生一驅動電流驅動發光元件發光。
在一實施例中,開關單元係一第一電晶體,具有一第一源/汲極端,係選擇性地電性連接工作電源或透過發光元件電性連接工作電源,且第一電晶體具有一第二源/汲極端,係選擇性地透過發光單元而接地或直接接地,且第一電晶體具有一閘極端,電性連接驅動訊號產生單元,以接收脈寬調變驅動訊號。
在一實施例中,發光元件係一發光二極體或一有機發光二極體。
在一實施例中,脈寬調變驅動訊號產生單元包括一比較器、一第二電晶體和一電容器。比較器具有一第一輸入端和一第二輸入端,第二輸入端接收參考訊號。第二電晶體接收一資料線所發出之資料訊號以及一掃描線所發出之一掃描訊號。第二電晶體電性連接至比較器的第一輸入端,以依據掃描訊號的狀態而將資料訊號送至第一輸入端。電容器的其中一端電性連接第一輸入端,另一端則接地,以儲存資料訊號的電位。其中比較器係將儲存在電容器中的資料訊號的電位與參考訊號比較,以產生脈寬調變驅動訊號。
在一實施例中,比較器在參考訊號的電位大於輸入電壓的電位時,輸出具有一第一狀態的脈寬調變驅動訊號,且在參考訊號的電位小於輸入電壓的電位時,輸出具有一第二狀態的脈寬調變驅動訊號。
在一實施例中,參考訊號是一三角波訊號、一方波訊號或一弦波訊號。
為達上述目的,本發明提供一種顯示面板。顯示面板包括一基板和複數個畫素電路。複數個畫素電路排列於基板。至少其中一畫素電路包括一發光元件、一驅動訊號產生單元和一開關單元。驅動訊號產生單元,係將一資料訊號與一參考訊號進行比較,而產生一脈寬調變驅動訊號,脈寬調變驅動訊號的狀態係依據資料訊號與參考訊號的比較結果而定。開關單元電性連接一工作電源和發光元件,並依據脈寬調變驅動訊號而產生
一驅動電流驅動發光元件發光。
在一實施例中,開關單元係一第一電晶體,具有一第一源/汲極端,係選擇性地電性連接工作電源或透過發光元件電性連接工作電源,且第一電晶體具有一第二源/汲極端,係選擇性地透過發光單元而接地或直接接地,且第一電晶體具有一閘極端,電性連接驅動訊號產生單元,以接收脈寬調變驅動訊號。
在一實施例中,發光元件係一發光二極體或一有機發光二極體。
在一實施例中,驅動訊號產生單元包括一比較器、一第二電晶體和一電容器。比較器具有一第一輸入端和一第二輸入端,第二輸入端接收參考訊號。第二電晶體接收一資料線所發出之資料訊號以及一掃描線所發出之一掃描訊號,第二電晶體電性連接至比較器的第一輸入端,以依據掃描訊號的狀態而將資料訊號送至第一輸入端。電容器的其中一端電性連接第一輸入端,另一端接地,以儲存資料訊號的電位而產生一輸入電壓。其中比較器係將儲存在電容器中資料訊號的電位與參考訊號比較,以產生脈寬調變驅動訊號。
在一實施例中,比較器在參考訊號的電位大於輸入電壓的電位時,輸出具有一第一狀態的脈寬調變驅動訊號,且在參考訊號的電位小於輸入電壓的電位時,輸出具有一第二狀態的脈寬調變驅動訊號。在一實施例中,顯示面板,更包括複數條掃描線、複數調資料線和複數條參考訊號線。複數條掃描線電性連接畫素電路,以傳送掃描訊號,掃描線朝一第一方向延伸,並沿一第二方向排列於基板,第一方向和該第二方向彼此實質上互相垂直。複數條資料線亦電性連接畫素電路,以傳送資料訊號,資料線朝該第二方向延伸,並沿第一方向排列於基板,且每一資料線與每一掃描線彼此交錯,而在基板上定義出複數畫素區域,使得畫素電路分別配置於畫素區域中。複數條參考訊號線也電性連接畫素電路,且參考訊號線分別傳送對應的參考訊號。
在一實施例中,參考訊號線係沿第一方向或第二方向排列,且其中至少一參考訊號線所傳送的參考訊號之波形與另一參考訊號線所傳
送的參考訊號之波形不同。
在一實施例中,所有參考訊號線所傳送的參考訊號皆相同。
在一實施例中,參考訊號是一三角波訊號、一方波訊號或一弦波訊號。
綜上所述,由於本發明是比較資料訊號和參考訊號來產生脈寬調變驅動訊號,並且驅動發光元件發光,因此本發明可以避免畫面發生閃爍的現象。另外,本發明在畫面閃爍時,只需要調高參考訊號Vref的頻率,就可以避免閃爍的現象發生,因此本發明不需要複雜的電路,也不會太大的耗能。
10、14‧‧‧有機發光二極體(OLED)畫素
102、104、144、302、304、310、316、318、320、306、308、312、314‧‧‧電晶體
106、146‧‧‧有機發光二極體(OLED)
112、154、DL‧‧‧資料線
114、152、SL‧‧‧掃描線
142‧‧‧驅動電路
2‧‧‧畫素電路
22‧‧‧發光元件
24‧‧‧開關單元
242‧‧‧第一電晶體
26‧‧‧驅動訊號產生單元
262‧‧‧比較器
264‧‧‧第二電晶體
266‧‧‧電容器
5‧‧‧顯示裝置
50‧‧‧顯示面板
502‧‧‧畫素電路
52‧‧‧掃描驅動器
54‧‧‧資料驅動器
Data‧‧‧資料訊號
F‧‧‧訊號起始點
F1、F2、F3‧‧‧圖框
FE‧‧‧下降緣
I1、Idrive‧‧‧驅動電流
IN1‧‧‧第一輸入端
IN2‧‧‧第二輸入端
LED(n)‧‧‧第n列發光元件
LED(n+1)‧‧‧第n+1列發光元件
OUT‧‧‧輸出端
PA‧‧‧畫素區域
PWM‧‧‧脈寬調變驅動訊號
Scan、Scan(n)、Scan(n+1)‧‧‧掃描訊號
SW‧‧‧開關訊號
t0、t1、t2、t3、t4‧‧‧時間
VBS‧‧‧偏壓
VCC‧‧‧工作電壓
VDD‧‧‧工作電源
Vdata‧‧‧資料訊號電壓
VL‧‧‧參考訊號線
Vref‧‧‧參考訊號
Vref(n)‧‧‧第n列參考訊號
Vref(n+1)‧‧‧第n+1列參考訊號
X、Y‧‧‧方向
圖1A繪示為習知之類比驅動之有機發光二極體畫素的等效電路圖。
圖1B繪示為習知之數位驅動之有機發光二極體畫素的等效電路圖。
圖1C繪示圖1B之OLED畫素的訊號時序圖。
圖2繪示為依照本發明之一較佳實施例的一種畫素電路的方塊圖。
圖3A繪示為依照本發明第一實施例的一種比較器的電路圖。
圖3B繪示為依照本發明第二實施例的一種比較器的電路圖。
圖4A繪示為依照本發明第一實施例的一種圖2之畫素電路的訊號時序圖。
圖4B繪示為依照本發明第二實施例的一種圖2之畫素電路的訊號時序圖。
圖4C繪示為依照本發明第三實施例的一種圖2之畫素電路的訊號時序圖。
圖5繪示為依照本發明之一較佳實施例的一種顯示裝置的方塊圖。
圖6繪示為依照本發明之一實施例之圖5顯示面板中的訊號時序圖。
以下將參照相關圖式,說明依本發明較佳實施例之畫素電路及顯示面板,其中相同的元件將以相同的參照符號加以說明。
圖2繪示為依照本發明之一較佳實施例的一種畫素電路的方塊圖。請參照圖2,本實施例所提供的畫素電路2包括發光元件22、開關單元24、驅動訊號產生單元26和工作電源VDD。開關單元24的一端電性連接發光元件22,而另一端則電性連接工作電源VDD。另外,開關單元24還電性連接驅動訊號產生單元26。本發明之畫素電路係為一主動矩陣式陣列電路,其可應用於各類顯示裝置,例如:戶外廣告看板、照明裝置、有機發光二極體顯示裝置、發光二極體顯示裝置等,於本發明不作限制。
驅動訊號產生單元26接收來自一資料線的一資料訊號Data和來自一掃描線的掃描訊號Scan,並且將資料訊號Data和一參考訊號Vref進行比較,而輸出一脈寬調變驅動訊號PWM至開關單元24。如此一來,開關單元24就可以依據脈寬調變驅動訊號PWM而產生一驅動電流Idrive,以驅動發光元件22發光。較佳地,驅動電流Idrive係固定的大小,惟本發明並不限定。
開關單元24可以利用第一電晶體242來實現,在本實施例中,第一電晶體242例如是PMOS電晶體,惟本發明並不限定。第一電晶體242的第一源/汲極端(或稱源極端)係電性連接工作電源VDD,其第二源/汲極端(或稱汲極端)則電性連接發光元件22,並透過發光元件22接地。而在另外一些實施例中,第一電晶體242的源極端可以透過發光元件22電性連接至工作電源VDD,而其汲極端則可以直接接地。另外,在本實施例中,發光元件22可以是有機電致發光二極體,其一端連接第一電晶體242,而另一端則是接地。在其他實施例中,發光元件22也可以是無機發光二極體,本發明並不限定。
請繼續參照圖2,驅動訊號產生單元26包括比較器262、第二電晶體264和電容器266。第二電晶體264的汲極端電性連接資料訊號Data,而閘極端則是電性連接掃描訊號Scan。另外,第二電晶體264的源極端則是電性連接至比較器262。此外,電容器266之一端電性連接第二電晶體264,另一端接地。在本實施例中,第二電晶體264例如是NMOS電晶體。
比較器262具有第一輸入端IN1、第二輸入端IN2和輸出端
OUT。第一輸入端IN1電性連接第二電晶體264的源極端,而第二輸入端IN2則是接收參考訊號Vref。另外,比較器262的輸出端OUT則是電性連接至第一電晶體242的閘極端,以將脈寬調變驅動訊號PWM輸出給第一電晶體242。
圖3A繪示為依照本發明第一實施例的一種比較器的電路圖。請參照圖3A,在本實施例中,比較器262包括電晶體302、304、306、308和310。其中,電晶體302和304為PMOS電晶體,而電晶體306、308和310則是NMOS電晶體。電晶體302和304的源極端電性連接工作電壓VCC,而閘極端則彼此電性連接。另外,電晶體302的閘極端和汲極端彼此電性連接。電晶體306和308的汲極端分別電性連接至電晶體302和304的汲極端,其中電晶體308的汲極端電性連接至比較器262的輸出端OUT,並且透過輸出端OUT電性連接至第一電晶體242的閘極端。此外,電晶體306的閘極端係上述的第一輸入端IN1,並且電性連接第二電晶體264的源極端。相對地,電晶體308的閘極端則是上述的第二輸入端IN2,並且電性連接參考訊號Vref。電晶體310的汲極端電性連接電晶體306和308的源極端,而電晶體310的閘極端和源極端則分別電性連接偏壓VBS和接地。
圖3B繪示為依照本發明第二實施例的一種比較器的電路圖。請參照圖3B,在本實施例中,比較器262也包括電晶體312、314、316、318和320。其中,電晶體312和314為NMOS電晶體,而電晶體316、318和320則是PMOS電晶體。電晶體312和314的源極端接地,而閘極端則彼此電性連接。另外,電晶體312的閘極端和汲極端彼此電性連接。電晶體316和318的汲極端分別電性連接至電晶體312和314的汲極端,其中電晶體318的汲極端係電性連接至比較器262的輸出端OUT,並且透過輸出端OUT電性連接至第一電晶體242的閘極端。此外,電晶體316的閘極端係上述的第一輸入端IN1,並且電性連接第二電晶體264的源極端。相對地,電晶體318的閘極端則是上述的第二輸入端IN2,並且電性連接參考訊號Vref。電晶體320的汲極端電性連接電晶體316和318的源極端,而電晶體320的閘極端和源極端則分別電性連接偏壓VBS和工作電壓VCC。
雖然上述提供了兩種不同的比較器電路,然而並不用來限定
本發明。本領域具有通常知識者當知,不同的比較器電路並不會影響本發明主要的精神。
圖4A繪示為依照本發明第一實施例的一種圖2之畫素電路的訊號時序圖。請合併參照圖2和圖4A,本實施例的訊號時序圖中繪示了相鄰的圖框時間F1、F2和F3為例說明。當掃描訊號Scan被致能時,代表一個圖框時間的開始,而第二電晶體264會被導通。此時,資料訊號Data就會通過第二電晶體264而儲存在電容器266中。因此,在比較器262的第一輸入端IN1就會輸入資料訊號電壓Vdata。接著,比較器262會將資料訊號電壓Vdata與參考訊號Vref進行比對。
在本實施例中,參考訊號Vref係三角波訊號,然而本發明並不以此為限。在其它的實施例中,參考訊號Vref也可以是弦波訊號、方波訊號、脈衝訊號等。當參考訊號Vref的電位比資料訊號Data的電位(也就是資料訊號電壓Vdata的電位,圖中以虛線表示)低時,比較器262就會輸出低電位的脈寬調變驅動訊號PWM。相對地,當參考訊號Vref的電位比資料訊號Data的電位高時,比較器262就會輸出具有高電位的脈寬調變驅動訊號PWM。當脈寬調變驅動訊號PWM係低電位時,第一電晶體242就會被啟動,而產生驅動電流Idrive來驅動發光元件(於此以LED為例)22發光。相反的,若是第一電晶體242為NMOS電晶體,則就會在脈寬調變驅動訊號PWM係高電位時被啟動,進而驅動發光元件22發光。
由於在本發明中,發光元件22是依據脈寬調變驅動訊號PWM而被驅動,並且脈寬調變驅動訊號PWM是依據資料訊號Data與參考訊號Vref的比較結果而產生。而特別的是,參考訊號Vref的頻率係大於圖框的更新時間(frame time),並且較佳地參考訊號Vref的頻率係圖框更新時間的倍數(本發明並不限制),較佳地參考訊號Vref的頻率係圖框更新時間的四倍以上,五倍、六倍則更佳。因此,即便在發光元件22以較暗的形式被驅動時,例如為50%以下的亮度被驅動時,發光元件22沒有被點亮的時間也不會太長。以25%的亮度為例,在習知的數位驅動技術中(如圖1C),OLED 146發光的時間會集中在時間t0中。若是一圖框的時間為X,則圖1C中OLED未被點亮的時間則為X-t0。相對地,在圖4A的圖框F3
的期間內,發光元件22也是以25%的亮度被驅動,但是其被點亮的時間則大致平均分配到時間t1、t2、t3和t4中。換句話說,發光元件22之發光頻率係大於習知技術中圖1C之OLED146的發光頻率。如此一來,本實施例就可以解決畫素的閃爍現象。另外,在本實施例中,參考訊號Vref的各訊號起始點F係對齊掃描訊號Scan(n+1)的起始時間,因此,在圖框F1期間內,上述發光元件22被點亮的時間係平均分配在圖框F1中。
另外,由於人眼容易在待觀察物體的發光頻率於180Hz以下,發現閃爍的情況,部份視覺敏銳者,甚至可以在發光頻率240Hz以下也可以發現閃爍情況,因此當本發明的畫素仍舊有閃爍的現象時,則僅需要調整參考訊號Vref的頻率,使發光元件22在圖框F1期間的發光頻率加快(大於180Hz,較佳地係大於240Hz),就不需要複雜的程序即可以解決閃爍的現象。
圖4B繪示為依照本發明第二實施例的一種圖2之畫素電路的訊號時序圖。請參照圖4B,在本實施例中,參考訊號Vref的各訊號起始點F並未對齊掃描訊號Scan(n+1)的起始時間,因此,在圖框F1期間內,上述發光元件22被點亮的時間並不是平均分配在圖框F1中。參考訊號Vref的各訊號起始點F可根據實際應用情況,對齊或不對齊訊號Scan(n+1)的起始時間,於本發明不作其他限制。
圖4C繪示為依照本發明第三實施例的一種圖2之畫素電路的訊號時序圖。請參照圖4C,在本實施例中,參考訊號Vref的波形並非規則。因此,上述發光元件22被點亮的時間也不會平均分配在圖框中。
圖5繪示為依照本發明之一較佳實施例的一種顯示裝置的方塊圖。請參照圖5,本實施例所提供的顯示裝置5,包括顯示面板50,以及多條掃描線SL和多條資料線DL。各掃描線SL係朝X方向延伸,並且沿著Y方向依序排列。相對地,各資料線DL係朝Y方向延伸,並且沿著X方向依序排列。因此,每一掃描線SL和資料線DL分別圍出一畫素區域PA。其中,掃描線SL和資料線DL彼此不相交。另外,在每一畫素區域PA係分別配置至少一畫素電路,例如502,並且至少一畫素電路係採用圖2的畫素電路架構。在本實施例中,顯示面板50上的所有畫素電路皆都採
用圖2的畫素電路架構。其中,各畫素電路分別對應電性連接至其中一掃描線SL和資料線DL。
此外,顯示裝置5還包括掃描驅動器52和資料驅動器54。掃描驅動器52係電性連接掃描線SL,以輸出掃描訊號Scan在掃描線SL上傳送。相對地,資料驅動器54則是電性連接至資料線DL,並且輸出資料訊號Data在資料線DL上傳送。
另外,特別的是,在本實施例中的顯示裝置5中,還具有複數條參考訊號線VL,同樣配置於顯示面板50上,並且分別電性連接至顯示面板50中的畫素電路。而這些條參考訊號線VL係分別傳送參考訊號Vref給所電性連接的畫素電路。在一些實施例中,其中一參考訊號線VL所傳送之參考訊號Vref的波形與另一參考訊號線VL所傳送之參考訊號Vref的波形不同。然而,在本實施例中,每一參考訊號線VL所傳送之參考訊號Vref的波形皆可以相同,本發明並不限定。
圖6繪示為依照本發明之一實施例之圖5顯示面板中的訊號時序圖。請參照圖6,在本實施例中,第n列的參考訊號線上所傳送的參考訊號Vref(n)與第n+1列參考訊號線上所傳送的參考訊號Vref(n+1)的波形並不相同。因此,第n列掃描線上的發光元件LED(n)與第n+1列上的發光元件LED(n+1)的發光模式並不相同。
從圖5可知,在本實施例中,整個顯示面板可以共用一個參考訊號Vref,因此調整起來非常方便。當然,也可以是顯示面板上部分的區域共用一參考訊號Vref,這也保持了系統設計上的彈性。
綜上所述,由於本發明是比較資料訊號和參考訊號來產生脈寬調變驅動訊號,並且驅動發光元件發光,因此本發明可以避免畫面發生閃爍的現象。另外,本發明在畫面閃爍時,只需要調高參考訊號Vref的頻率,就可以避免閃爍的現象發生,因此本發明不需要複雜的電路,也不會太大的耗能。
以上所述僅為舉例性,而非為限制性者。任何未脫離本發明之精神與範疇,而對其進行之等效修改或變更,均應包含於後附之申請專利範圍中。
2‧‧‧畫素電路
22‧‧‧發光元件
24‧‧‧開關單元
242‧‧‧第一電晶體
26‧‧‧驅動訊號產生單元
262‧‧‧比較器
264‧‧‧第二電晶體
266‧‧‧電容器
Data‧‧‧資料訊號
Idrive‧‧‧驅動電流
IN1‧‧‧第一輸入端
IN2‧‧‧第二輸入端
OUT‧‧‧輸出端
PWM‧‧‧脈寬調變驅動訊號
Scan‧‧‧掃描訊號
VDD‧‧‧工作電源
Vdata‧‧‧資料訊號電壓
Vref‧‧‧參考訊號
Claims (15)
- 一種畫素電路,包括:一發光元件;一驅動訊號產生單元,係將一資料訊號與一參考訊號進行比較,而產生一脈寬調變驅動訊號,該脈寬調變驅動訊號的狀態係依據該資料訊號與該參考訊號的比較結果而定;以及一開關單元,電性連接一工作電源和該發光元件,並依據該脈寬調變驅動訊號而產生一驅動電流驅動該發光元件發光。
- 如申請專利範圍第1項所述之畫素電路,其中該開關單元係一第一電晶體,具有一第一源/汲極端,係選擇性地電性連接該工作電源或透過該發光元件電性連接該工作電源,且該第一電晶體具有一第二源/汲極端,係選擇性地透過該發光單元而接地或直接接地,且該第一電晶體具有一閘極端,電性連接該驅動訊號產生單元,以接收該脈寬調變驅動訊號。
- 如申請專利範圍第1項所述之畫素電路,其中該發光元件係一發光二極體或一有機發光二極體。
- 如申請專利範圍第1項所述之畫素電路,其中該脈寬調變驅動訊號產生單元包括:一比較器,具有一第一輸入端和一第二輸入端,該第二輸入端接收該參考訊號;一第二電晶體,接收一資料線所發出之該資料訊號以及一掃描線所發出之一掃描訊號,該第二電晶體電性連接至該比較器的該第一輸入端,以依據該掃描訊號的狀態而將該資料訊號送至該第一輸入端;以及一電容器,其中一端電性連接該第一輸入端,另一端接地,以儲存該資料訊號的電位,其中該比較器係將儲存在該電容器中該資料訊號的電位與該參考訊號比較,以產生該脈寬調變驅動訊號。
- 如申請專利範圍第4項所述之畫素電路,其中該比較器在該參考訊號的電位大於該輸入電壓的電位時,輸出具有一第一狀態的脈寬調變驅動訊號,且在該參考訊號的電位小於該輸入電壓的電位時,輸出具有一第二 狀態的脈寬調變驅動訊號。
- 如申請專利範圍第1項所述之畫素電路,其中該參考訊號是一三角波訊號、一方波訊號或一弦波訊號。
- 一種顯示面板,包括:一基板;複數個畫素電路,排列於該基板,至少其中一畫素電路包括:一發光元件;一驅動訊號產生單元,係將一資料訊號與一參考訊號進行比較,而產生一脈寬調變驅動訊號,該脈寬調變驅動訊號的狀態係依據該資料訊號與該參考訊號的比較結果而定;以及一開關單元,電性連接一工作電源和該發光元件,並依據該脈寬調變驅動訊號而產生一驅動電流驅動該發光元件發光。
- 如申請專利範圍第7項所述之顯示面板,其中該開關單元係一第一電晶體,具有一第一源/汲極端,係選擇性地電性連接該工作電源或透過該發光元件電性連接該工作電源,且該第一電晶體具有一第二源/汲極端,係選擇性地透過該發光單元而接地或直接接地,且該第一電晶體具有一閘極端,電性連接該驅動訊號產生單元,以接收該脈寬調變驅動訊號。
- 如申請專利範圍第7項所述之顯示面板,其中該發光元件係一發光二極體或一有機發光二極體。
- 如申請專利範圍第7項所述之顯示面板,其中該驅動訊號產生單元包括:一比較器,具有一第一輸入端和一第二輸入端,該第二輸入端接收該參考訊號;一第二電晶體,接收一資料線所發出之該資料訊號以及一掃描線所發出之一掃描訊號,該第二電晶體電性連接至該比較器的該第一輸入端,以依據該掃描訊號的狀態而將該資料訊號送至該第一輸入端;以及一電容器,其中一端電性連接該第一輸入端,另一端接地,以儲存該資料訊號的電位而產生一輸入電壓, 其中該比較器係將儲存在該電容器中該資料訊號的電位與該參考訊號比較,以產生該脈寬調變驅動訊號。
- 如申請專利範圍第10項所述之顯示面板,其中該比較器在該參考訊號的電位大於該輸入電壓的電位時,輸出具有一第一狀態的脈寬調變驅動訊號,且在該參考訊號的電位小於該輸入電壓的電位時,輸出具有一第二狀態的脈寬調變驅動訊號。
- 如申請專利範圍第8項所述之顯示面板,更包括:複數條掃描線,電性連接該些畫素電路,以傳送該掃描訊號,該些掃描線朝一第一方向延伸,並沿一第二方向排列於該基板,該第一方向和該第二方向彼此實質上互相垂直;複數條資料線,電性連接該些畫素電路,以傳送該資料訊號,該些資料線朝該第二方向延伸,並沿該第一方向排列於該基板,且每一該些資料線與各該掃描線彼此交錯,而在該基板上定義出複數畫素區域,使得各該畫素電路分別配置於各該畫素區域;以及複數條參考訊號線,電性連接該些畫素電路,且各該些參考訊號線分別傳送對應的參考訊號。
- 如申請專利範圍第12項所述之顯示面板,其中該些參考訊號線係沿該第一方向或該第二方向排列,且其中至少一參考訊號線所傳送的參考訊號之波形與另一參考訊號線所傳送的參考訊號之波形不同。
- 如申請專利範圍第12項所述之顯示面板,其中所有該些參考訊號線所傳送的參考訊號皆相同。
- 如申請專利範圍第7項所述之顯示面板,其中該參考訊號是一三角波訊號、一方波訊號或一弦波訊號。
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CN114333704A (zh) * | 2021-12-31 | 2022-04-12 | 厦门天马微电子有限公司 | 一种像素驱动电路及其驱动方法、显示面板 |
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CN115294923B (zh) * | 2022-08-29 | 2023-11-21 | 惠科股份有限公司 | 稳压电路及显示面板 |
CN116013192A (zh) * | 2023-01-28 | 2023-04-25 | 天马微电子股份有限公司 | 微集成电路、微集成电路组件、显示面板及显示装置 |
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GB2367413A (en) * | 2000-09-28 | 2002-04-03 | Seiko Epson Corp | Organic electroluminescent display device |
JP3973471B2 (ja) * | 2001-12-14 | 2007-09-12 | 三洋電機株式会社 | デジタル駆動型表示装置 |
JP3854161B2 (ja) * | 2002-01-31 | 2006-12-06 | 株式会社日立製作所 | 表示装置 |
-
2015
- 2015-08-04 TW TW104125303A patent/TW201706978A/zh unknown
-
2016
- 2016-08-03 CN CN201610628214.2A patent/CN106469539A/zh active Pending
- 2016-08-03 EP EP16182625.0A patent/EP3128511A1/en not_active Withdrawn
- 2016-08-03 US US15/227,244 patent/US20170039935A1/en not_active Abandoned
Cited By (7)
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US11922859B2 (en) | 2018-05-17 | 2024-03-05 | Semiconductor Energy Laboratory Co., Ltd. | Display panel, display device, input/output device, and data processing device |
US11823614B2 (en) | 2018-05-18 | 2023-11-21 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method for driving display device |
CN109243361A (zh) * | 2018-08-13 | 2019-01-18 | 友达光电股份有限公司 | 像素单元 |
TWI668508B (zh) * | 2018-08-13 | 2019-08-11 | 友達光電股份有限公司 | 畫素單元 |
TWI707328B (zh) * | 2019-09-17 | 2020-10-11 | 友達光電股份有限公司 | 驅動晶片與相關的顯示器 |
US11081046B2 (en) | 2019-09-17 | 2021-08-03 | Au Optronics Corporation | Driving chip and display device having the same |
TWI771895B (zh) * | 2021-02-03 | 2022-07-21 | 友達光電股份有限公司 | 畫素電路及其驅動方法 |
Also Published As
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CN106469539A (zh) | 2017-03-01 |
US20170039935A1 (en) | 2017-02-09 |
EP3128511A1 (en) | 2017-02-08 |
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