TWI841058B

TWI841058B - Display panel and pixel circuit

Info

Publication number: TWI841058B
Application number: TW111143964A
Authority: TW
Inventors: 簡靈櫻; 劉匡祥; 施立偉
Original assignee: 友達光電股份有限公司
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2024-05-01
Also published as: TW202422297A

Abstract

A display panel and a pixel circuit are provided. A driving current generating circuit generates a first driving current, a second driving current or a third driving current according to a data voltage, a first lighting control signal, a second lighting control signal and a third lighting control signal. A switching circuit provides the first driving current, the second driving current or the third driving current generated by the driving current generating circuit to a corresponding first light-emitting element, a corresponding second light-emitting element or a corresponding third light-emitting element according to the first lighting control signal, the second lighting control signal and the third lighting control signal.

Description

Display panel and pixel circuit

本發明是有關於一種電子裝置，且特別是有關於一種顯示面板及畫素電路。The present invention relates to an electronic device, and in particular to a display panel and a pixel circuit.

將指紋辨識整合於液晶顯示器的顯示器或其他類型的顯示器(如OLED、LCD、uLED,...)顯示器，不但可增進使用者進行便利、快速的輸入，且可提供互動的存取功能，因此已逐漸應用於一些攜帶型電子裝置中，例如行動電話或筆記型電腦。Integrating fingerprint recognition into a liquid crystal display or other types of displays (such as OLED, LCD, uLED, ...) can not only enhance the convenience and speed of user input, but also provide interactive access functions. Therefore, it has gradually been applied to some portable electronic devices, such as mobile phones or laptops.

於傳統指紋辨識顯示器中，指紋辨識面板係直接貼附於顯示面板上(on cell)。此種裝配方法雖然簡單，但指紋辨識面板的厚度會較厚。為了改善這些缺點，一種於顯示器之像素陣列(pixel array)結構中嵌入指紋感測器(in cell)的技術便被提出。然而，在不增加顯示面板的面積的情形下，要在像素陣列中嵌入感測器勢必須騰出空間容納感測器，因此如何降低顯示面板的畫素電路的面積為十分重要的課題。In traditional fingerprint recognition displays, the fingerprint recognition panel is directly attached to the display panel (on cell). Although this assembly method is simple, the fingerprint recognition panel is thicker. In order to improve these shortcomings, a technology of embedding fingerprint sensors in the pixel array structure of the display (in cell) has been proposed. However, in order to embed the sensor in the pixel array without increasing the area of the display panel, space must be freed up to accommodate the sensor. Therefore, how to reduce the area of the pixel circuit of the display panel is a very important issue.

本發明提供一種顯示面板及畫素電路，具有可大幅縮減畫素電路面積的電路結構，而適合應用於內嵌式指紋辨識技術。The present invention provides a display panel and a pixel circuit, which have a circuit structure that can significantly reduce the pixel circuit area and are suitable for application in embedded fingerprint recognition technology.

本發明的畫素電路包括驅動電流產生電路、第一發光元件、第二發光元件、第三發光元件以及切換電路。驅動電流產生電路耦接資料線，接收來自資料線的資料電壓，依據資料電壓、第一發光控制信號、第二發光控制信號以及第三發光控制信號產生第一驅動電流、第二驅動電流或第三驅動電流。切換電路耦接驅動電流產生電路以及第一發光元件、第二發光元件以及第三發光元件，依據第一發光控制信號、第二發光控制信號以及第三發光控制信號將第一驅動電流、第二驅動電流以及第三驅動電流分別提供給第一發光元件、第二發光元件以及第三發光元件，以分別驅動第一發光元件、第二發光元件以及第三發光元件發光。The pixel circuit of the present invention includes a driving current generating circuit, a first light-emitting element, a second light-emitting element, a third light-emitting element and a switching circuit. The driving current generating circuit is coupled to a data line, receives a data voltage from the data line, and generates a first driving current, a second driving current or a third driving current according to the data voltage, a first light-emitting control signal, a second light-emitting control signal and a third light-emitting control signal. The switching circuit is coupled to the driving current generating circuit and the first light-emitting element, the second light-emitting element and the third light-emitting element, and provides the first driving current, the second driving current and the third driving current to the first light-emitting element, the second light-emitting element and the third light-emitting element according to the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal, respectively, so as to drive the first light-emitting element, the second light-emitting element and the third light-emitting element to emit light respectively.

在本發明的一實施例中，上述的驅動電流產生電路包括第一電晶體至第八電晶體以及電容。第一電晶體的一端耦接資料線，第一電晶體的控制端接收第一控制信號。第二電晶體耦接於第一電晶體的另一端與第一參考電壓之間，第二電晶體的控制端接收第一發光控制信號。第三電晶體耦接於第一電晶體的另一端與第一參考電壓之間，第三電晶體的控制端接收第二發光控制信號。第四電晶體耦接於第一電晶體的另一端與第一參考電壓之間，第四電晶體的控制端接收第三發光控制信號。電容的一端耦接第一電晶體的另一端。第五電晶體與第六電晶體串接於電容的另一端與驅動電流產生電路的輸出端之間，第五電晶體與第六電晶體的控制端接收第一控制信號。第七電晶體耦接於第五電晶體與第六電晶體的共同接點與第二參考電壓之間，第七電晶體的控制端接收第二控制信號。第八電晶體耦接於電源電壓與驅動電流產生電路的輸出端之間，第八電晶體的控制端耦接電容的另一端，於重置及寫入期間，第二控制信號先導通第七電晶體的控制端，而後第一控制信號導通第一電晶體、第五電晶體與第六電晶體。In one embodiment of the present invention, the above-mentioned driving current generating circuit includes a first transistor to an eighth transistor and a capacitor. One end of the first transistor is coupled to the data line, and the control end of the first transistor receives a first control signal. The second transistor is coupled between the other end of the first transistor and the first reference voltage, and the control end of the second transistor receives a first light-emitting control signal. The third transistor is coupled between the other end of the first transistor and the first reference voltage, and the control end of the third transistor receives a second light-emitting control signal. The fourth transistor is coupled between the other end of the first transistor and the first reference voltage, and the control end of the fourth transistor receives the third light-emitting control signal. One end of the capacitor is coupled to the other end of the first transistor. The fifth transistor and the sixth transistor are connected in series between the other end of the capacitor and the output end of the driving current generating circuit, and the control ends of the fifth transistor and the sixth transistor receive the first control signal. The seventh transistor is coupled between the common node of the fifth transistor and the sixth transistor and the second reference voltage, and the control terminal of the seventh transistor receives the second control signal. The eighth transistor is coupled between the power voltage and the output terminal of the driving current generating circuit, and the control terminal of the eighth transistor is coupled to the other end of the capacitor. During the reset and write period, the second control signal first turns on the control terminal of the seventh transistor, and then the first control signal turns on the first transistor, the fifth transistor and the sixth transistor.

在本發明的一實施例中，上述的切換電路包括第九電晶體至第十一電晶體。第九電晶體耦接於驅動電流產生電路的輸出端與第一發光元件之間，第九電晶體的控制端接收第一發光控制信號。第十電晶體耦接於驅動電流產生電路的輸出端與第二發光元件之間，第十電晶體的控制端接收第二發光控制信號。第十一電晶體耦接於驅動電流產生電路的輸出端與第三發光元件之間，第十一電晶體的控制端接收第三發光控制信號。In one embodiment of the present invention, the switching circuit includes a ninth transistor to an eleventh transistor. The ninth transistor is coupled between the output end of the driving current generating circuit and the first light-emitting element, and the control end of the ninth transistor receives the first light-emitting control signal. The tenth transistor is coupled between the output end of the driving current generating circuit and the second light-emitting element, and the control end of the tenth transistor receives the second light-emitting control signal. The eleventh transistor is coupled between the output end of the driving current generating circuit and the third light-emitting element, and the control end of the eleventh transistor receives the third light-emitting control signal.

在本發明的一實施例中，於發光期間，第一發光控制信號、第二發光控制信號以及第三發光控制信號導通第二電晶體、第三電晶體以及第四電晶體其中之一，並對應地導通第九電晶體、第十電晶體以及第十一電晶體其中之一。In an embodiment of the present invention, during the light emission period, the first light emission control signal, the second light emission control signal and the third light emission control signal turn on one of the second transistor, the third transistor and the fourth transistor, and correspondingly turn on one of the ninth transistor, the tenth transistor and the eleventh transistor.

在本發明的一實施例中，上述的切換電路包括第十二電晶體至第十四電晶體。第十二電晶體耦接於第九電晶體與第一發光元件的共同接點與重置電壓之間，第十二電晶體的控制端接收第三控制信號。第十三電晶體耦接於第十電晶體與第二發光元件的共同接點與重置電壓之間，第十三電晶體的控制端接收第三控制信號。第十四電晶體耦接於第十一電晶體與第二發光元件的共同接點與重置電壓之間，第十四電晶體的控制端接收第三控制信號，其中第三控制信號於重置及寫入期間導通第十二電晶體、第十電晶體與第十四電晶體。In one embodiment of the present invention, the switching circuit includes twelfth to fourteenth transistors. The twelfth transistor is coupled between the common contact of the ninth transistor and the first light-emitting element and the reset voltage, and the control end of the twelfth transistor receives a third control signal. The thirteenth transistor is coupled between the common contact of the tenth transistor and the second light-emitting element and the reset voltage, and the control end of the thirteenth transistor receives the third control signal. The fourteenth transistor is coupled between the common contact of the eleventh transistor and the second light-emitting element and the reset voltage, and the control end of the fourteenth transistor receives the third control signal, wherein the third control signal turns on the twelfth transistor, the tenth transistor, and the fourteenth transistor during the reset and write periods.

在本發明的一實施例中，上述的第一發光元件、第二發光元件以及第三發光元件為發光二極體。In an embodiment of the present invention, the first light emitting element, the second light emitting element and the third light emitting element are light emitting diodes.

本發明還提供一種顯示面板包括掃描驅動電路、資料驅動電路以及多個畫素電路。掃描驅動電路提供第一發光控制信號、第二發光控制信號以及第三發光控制信號。資料驅動電路提供資料電壓。多個畫素電路耦接掃描驅動電路以及資料驅動電路，各畫素電路包括驅動電流產生電路、第一發光元件、第二發光元件、第三發光元件以及切換電路。驅動電流產生電路耦接資料線，接收來自資料線的資料電壓，依據資料電壓、第一發光控制信號、第二發光控制信號以及第三發光控制信號產生第一驅動電流、第二驅動電流或第三驅動電流。切換電路耦接驅動電流產生電路以及第一發光元件、第二發光元件以及第三發光元件，依據第一發光控制信號、第二發光控制信號以及第三發光控制信號將第一驅動電流、第二驅動電流以及第三驅動電流分別提供給第一發光元件、第二發光元件以及第三發光元件，以分別驅動第一發光元件、第二發光元件以及第三發光元件發光。The present invention also provides a display panel including a scanning drive circuit, a data drive circuit and a plurality of pixel circuits. The scanning drive circuit provides a first light-emitting control signal, a second light-emitting control signal and a third light-emitting control signal. The data drive circuit provides a data voltage. A plurality of pixel circuits are coupled to the scanning drive circuit and the data drive circuit, and each pixel circuit includes a drive current generating circuit, a first light-emitting element, a second light-emitting element, a third light-emitting element and a switching circuit. The drive current generating circuit is coupled to the data line, receives the data voltage from the data line, and generates a first drive current, a second drive current or a third drive current according to the data voltage, the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal. The switching circuit is coupled to the driving current generating circuit and the first light-emitting element, the second light-emitting element and the third light-emitting element, and provides the first driving current, the second driving current and the third driving current to the first light-emitting element, the second light-emitting element and the third light-emitting element respectively according to the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal to drive the first light-emitting element, the second light-emitting element and the third light-emitting element to emit light respectively.

基于上述，本發明實施例的驅動電流產生電路可依據資料電壓、第一發光控制信號、第二發光控制信號以及第三發光控制信號產生第一驅動電流、第二驅動電流或第三驅動電流，切換電路可依據第一發光控制信號、第二發光控制信號以及第三發光控制信號將驅動電流產生電路產生的第一驅動電流、第二驅動電流或第三驅動電流提供至對應的第一發光元件、第二發光元件或第三發光元件。相較於習知技術中一個發光元件需由對應的一個畫素電路以及一條資料線驅動，上述實施例的顯示面板及畫素電路將三個發光元件整合至一個畫素電路中，且一個畫素電路僅需使用一條資料線，因此可大幅縮減畫素電路面積的電路結構，而使顯示面板及畫素電路更適合應用於內嵌式(in cell)指紋辨識顯示技術。Based on the above, the driving current generating circuit of the embodiment of the present invention can generate the first driving current, the second driving current or the third driving current according to the data voltage, the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal, and the switching circuit can provide the first driving current, the second driving current or the third driving current generated by the driving current generating circuit to the corresponding first light-emitting element, the second light-emitting element or the third light-emitting element according to the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal. Compared to the prior art in which one light-emitting element needs to be driven by a corresponding pixel circuit and a data line, the display panel and pixel circuit of the above embodiment integrate three light-emitting elements into one pixel circuit, and one pixel circuit only uses one data line, thereby greatly reducing the circuit structure of the pixel circuit area, making the display panel and pixel circuit more suitable for application in in-cell fingerprint recognition display technology.

圖1是依照本發明的實施例的一種顯示面板的示意圖，請參照圖1。顯示面板100包括掃描驅動電路102、資料驅動電路104以及多個畫素電路P1，各個畫素電路P1分別通過對應的資料線DL與掃描線GL耦接至資料驅動電路104以及掃描驅動電路102，並依據掃描驅動電路102提供的控制信號以及資料驅動電路104提供的資料信號顯示影像畫面。FIG1 is a schematic diagram of a display panel according to an embodiment of the present invention, please refer to FIG1. The display panel 100 includes a scan driver circuit 102, a data driver circuit 104, and a plurality of pixel circuits P1, each pixel circuit P1 is coupled to the data driver circuit 104 and the scan driver circuit 102 through a corresponding data line DL and a scan line GL, and displays an image according to a control signal provided by the scan driver circuit 102 and a data signal provided by the data driver circuit 104.

進一步來說，畫素電路P1的實施方式可如圖2所示，包括驅動電流產生電路202、切換電路204、第一發光元件RE、第二發光元件GE以及第三發光元件BE，驅動電流產生電路202耦接對應的資料線DL以及切換電路204，切換電路還耦接第一發光元件RE、第二發光元件GE以及第三發光元件BE，其中第一發光元件RE、第二發光元件GE以及第三發光元件BE為以發光二極體實施，然不以此為限，發光二極體的陽極與陰極分別耦接切換電路204與接地電壓OVSS。第一發光元件RE、第二發光元件GE以及第三發光元件BE分別用以顯示紅色、綠色以及藍色的影像畫面。Furthermore, the pixel circuit P1 can be implemented as shown in FIG. 2, including a driving current generating circuit 202, a switching circuit 204, a first light emitting element RE, a second light emitting element GE, and a third light emitting element BE. The driving current generating circuit 202 is coupled to the corresponding data line DL and the switching circuit 204. The switching circuit is also coupled to the first light emitting element RE, the second light emitting element GE, and the third light emitting element BE. The first light emitting element RE, the second light emitting element GE, and the third light emitting element BE are implemented by light emitting diodes, but not limited thereto. The anode and cathode of the light emitting diode are respectively coupled to the switching circuit 204 and the ground voltage OVSS. The first light emitting element RE, the second light emitting element GE, and the third light emitting element BE are used to display red, green, and blue image images, respectively.

驅動電流產生電路202可接收來自資料線DL的資料電壓D1以及來自掃描線GL的第一發光控制信號EMR[n]、第二發光控制信號EMG[n]以及第三發光控制信號EMB[n]，其中n代表第n條掃描線GL所提供的控制信號，n為正整數。驅動電流產生電路202可依據資料電壓DL、第一發光控制信號EMR[n]、第二發光控制信號EMG[n]以及第三發光控制信號EMB[n]產生第一驅動電流IR、第二驅動電流IG或第三驅動電流IB，其中第一驅動電流IR、第二驅動電流IG或第三驅動電流IB分別用以驅動第一發光元件RE、第二發光元件GE以及第三發光元件BE進行發光。The driving current generating circuit 202 can receive the data voltage D1 from the data line DL and the first light emitting control signal EMR[n], the second light emitting control signal EMG[n] and the third light emitting control signal EMB[n] from the scanning line GL, wherein n represents the control signal provided by the n-th scanning line GL, and n is a positive integer. The driving current generating circuit 202 can generate the first driving current IR, the second driving current IG or the third driving current IB according to the data voltage DL, the first light emitting control signal EMR[n], the second light emitting control signal EMG[n] and the third light emitting control signal EMB[n], wherein the first driving current IR, the second driving current IG or the third driving current IB are respectively used to drive the first light emitting element RE, the second light emitting element GE and the third light emitting element BE to emit light.

切換電路204可依據第一發光控制信號EMR[n]、第二發光控制信號EMG[n]以及第三發光控制信號EMB[n]將驅動電流產生電路202提供的驅動電流提供給對應的發光元件，以切換進行發光的發光元件。例如，當驅動電流產生電路202產生第一驅動電流IR時，切換電路204將第一驅動電流IR提供給第一發光元件RE，以驅動第一發光元件RE進行發光，當驅動電流產生電路202產生第二驅動電流IG時，切換電路204將第二驅動電流IG提供給第二發光元件GE，以驅動第二發光元件GE進行發光，當驅動電流產生電路202產生第三驅動電流IB時，切換電路204將第三驅動電流IB提供給第三發光元件BE，以驅動第三發光元件BE進行發光。如此將三個發光元件整合至一個畫素電路P1中，並藉由第一發光控制信號EMR[n]、第二發光控制信號EMG[n]以及第三發光控制信號EMB[n]來控制畫素電路P1選擇發光的發光元件，可大幅縮減畫素電路P1的面積，使顯示面板100可騰出更多空間放置指紋辨識感測器，而讓顯示面板100以及畫素電路P1更適合應用於內嵌式指紋辨識顯示技術。The switching circuit 204 can provide the driving current provided by the driving current generating circuit 202 to the corresponding light-emitting element according to the first light-emitting control signal EMR[n], the second light-emitting control signal EMG[n] and the third light-emitting control signal EMB[n], so as to switch the light-emitting element to emit light. For example, when the driving current generating circuit 202 generates a first driving current IR, the switching circuit 204 provides the first driving current IR to the first light-emitting element RE to drive the first light-emitting element RE to emit light; when the driving current generating circuit 202 generates a second driving current IG, the switching circuit 204 provides the second driving current IG to the second light-emitting element GE to drive the second light-emitting element GE to emit light; when the driving current generating circuit 202 generates a third driving current IB, the switching circuit 204 provides the third driving current IB to the third light-emitting element BE to drive the third light-emitting element BE to emit light. In this way, three light-emitting elements are integrated into one pixel circuit P1, and the first light-emitting control signal EMR[n], the second light-emitting control signal EMG[n] and the third light-emitting control signal EMB[n] are used to control the pixel circuit P1 to select the light-emitting element. This can greatly reduce the area of the pixel circuit P1, so that the display panel 100 can free up more space to place the fingerprint recognition sensor, making the display panel 100 and the pixel circuit P1 more suitable for application in embedded fingerprint recognition display technology.

圖3是依照本發明另一實施例的畫素電路的示意圖。詳細來說，畫素電路P1的實施方式可如圖3所示，其中驅動電流產生電路202包括電晶體M1~M8以及電容C1，切換電路204包括電晶體M9~M14。在驅動電流產生電路202中，電晶體M1的第一端耦接資料線DL，電晶體M2~M4並聯連接於電晶體M1的第二端與參考電壓Vref1之間。電容C1耦接於電晶體M1的第二端與電晶體M8的控制端之間，電晶體M8的第一端與第二端分別耦接電源電壓OVDD與驅動電流產生電路202的輸出端。電晶體M5與M6串接於電晶體M8的控制端與驅動電流產生電路202的輸出端之間，電晶體M7耦接於電晶體M5與M6的共同接點與參考電壓Vref2之間。在切換電路204中，電晶體M9~M11分別耦接於驅動電流產生電路202的輸出端與對應的第一發光元件RE、第二發光元件GE以及第三發光元件BE之間，電晶體M12~14則分別耦接於重置電壓VRS與對應的第一發光元件RE、第二發光元件GE以及第三發光元件BE之間。FIG3 is a schematic diagram of a pixel circuit according to another embodiment of the present invention. In detail, the implementation of the pixel circuit P1 can be as shown in FIG3, wherein the driving current generating circuit 202 includes transistors M1 to M8 and a capacitor C1, and the switching circuit 204 includes transistors M9 to M14. In the driving current generating circuit 202, the first end of the transistor M1 is coupled to the data line DL, and the transistors M2 to M4 are connected in parallel between the second end of the transistor M1 and the reference voltage Vref1. The capacitor C1 is coupled between the second end of the transistor M1 and the control end of the transistor M8, and the first end and the second end of the transistor M8 are coupled to the power voltage OVDD and the output end of the driving current generating circuit 202, respectively. Transistors M5 and M6 are connected in series between the control terminal of transistor M8 and the output terminal of the driving current generating circuit 202, and transistor M7 is coupled between the common connection point of transistors M5 and M6 and the reference voltage Vref2. In the switching circuit 204, transistors M9-M11 are respectively coupled between the output terminal of the driving current generating circuit 202 and the corresponding first light emitting element RE, second light emitting element GE and third light emitting element BE, and transistors M12-14 are respectively coupled between the reset voltage VRS and the corresponding first light emitting element RE, second light emitting element GE and third light emitting element BE.

如圖4所示，掃描驅動電路102可於重置及寫入期間TCW將輸出至電晶體M7的第一控制信號S1[n]拉低至低電壓準位，以導通電晶體M7，而後再將輸出至電晶體M1、M5以及M6的第二控制信號S2[n]拉低至低電壓準位，以將資料線DL提供的資料電壓D1儲存於電容C1，而使電晶體M8的閘極電壓Vg具有對應的資料電壓D1的電壓值。此外，掃描驅動電路102還可將輸出至電晶體M12~M14的第三控制信號S3拉低至低電壓準位，以重置電晶體M12~M14與第一發光元件RE、第二發光元件GE以及第三發光元件BE的連接處的電壓(亦即發光二極體的陽極的電壓)重置為重置電壓VRS，其中第三控制信號S3可例如為相鄰的掃描線的第一控制信號(例如S1[n-1]或S1[n+1])，然不以此為限，只要能在重置及寫入期間TCW導通電晶體M12~M14的信號皆可做為第三控制信號S3，此外，重置電壓VRS可例如為接地電壓，然不以此為限。As shown in FIG4 , the scan driver circuit 102 can pull down the first control signal S1[n] output to the transistor M7 to a low voltage level during the reset and write period TCW to turn on the transistor M7, and then pull down the second control signal S2[n] output to the transistors M1, M5 and M6 to a low voltage level to store the data voltage D1 provided by the data line DL in the capacitor C1, so that the gate voltage Vg of the transistor M8 has a voltage value corresponding to the data voltage D1. In addition, the scanning drive circuit 102 can also pull down the third control signal S3 output to the transistors M12~M14 to a low voltage level to reset the voltage at the connection between the transistors M12~M14 and the first light-emitting element RE, the second light-emitting element GE and the third light-emitting element BE (that is, the voltage of the anode of the light-emitting diode) to the reset voltage VRS, wherein the third control signal S3 can be, for example, the first control signal of the adjacent scanning line (for example, S1[n-1] or S1[n+1]), but is not limited to this. As long as the signal can turn on the transistors M12~M14 during the reset and write period TCW, it can be used as the third control signal S3. In addition, the reset voltage VRS can be, for example, the ground voltage, but is not limited to this.

在發光期間中，例如在第一發光元件RE的發光期間TR中，第一控制信號S1[n]、第二控制信號S2[n]以及第三控制信號S3處於高電壓準位，而使電晶體M1、M5~M7以及M12~M14處於斷開狀態，此外第一發光控制信號EMR[n]被拉低至低電壓準位而使電晶體M2以及M9進入導通狀態，電晶體M3、M4、M10以及M11則處於斷開狀態。此時電晶體M8可依據電容C1所儲存的資料電壓D1輸出驅動電流IR，驅動電流IR可流經導通的電晶體M9而被提供給第一發光元件RE，以驅動第一發光元件RE進行發光。類似地，掃描驅動電路102也可以相同的方式在發光期間TG與TB驅動第二發光元件GE以及第三發光元件BE，在此不再贅述其實施方式。During the light-emitting period, for example, during the light-emitting period TR of the first light-emitting element RE, the first control signal S1[n], the second control signal S2[n] and the third control signal S3 are at a high voltage level, so that the transistors M1, M5-M7 and M12-M14 are in a disconnected state. In addition, the first light-emitting control signal EMR[n] is pulled down to a low voltage level to turn on the transistors M2 and M9, and the transistors M3, M4, M10 and M11 are in a disconnected state. At this time, the transistor M8 can output a driving current IR according to the data voltage D1 stored in the capacitor C1, and the driving current IR can flow through the turned-on transistor M9 and be provided to the first light-emitting element RE to drive the first light-emitting element RE to emit light. Similarly, the scanning driving circuit 102 can also drive the second light emitting element GE and the third light emitting element BE during the light emitting periods TG and TB in the same manner, and its implementation will not be described in detail herein.

圖5是依照本發明實施例的一種顯示面板的操作時序圖。如圖5所示，假設顯示面板100包括M條掃描線GL(M為正整數)，顯示面板100在顯示影像畫面時，可依據上述實施例的驅動方式輪流地驅動各畫素電路P1的第一發光元件RE、第二發光元件GE以及第三發光元件BE，亦即可先輪流驅動各條掃描線GL上的畫素電路P1的第一發光元件RE，再輪流驅動各條掃描線GL上的畫素電路P1的第二發光元件GE，而後再輪流驅動各條掃描線GL上的畫素電路P1的第三發光元件BE，以使顯示面板100依序輪流地顯示紅色、綠色以及藍色的影像畫面，藉由視覺殘留的效應來使觀看者看到彩色畫面。FIG5 is an operation timing diagram of a display panel according to an embodiment of the present invention. As shown in FIG5, assuming that the display panel 100 includes M scanning lines GL (M is a positive integer), when the display panel 100 displays an image, the first light emitting element RE, the second light emitting element GE and the third light emitting element BE of each pixel circuit P1 can be driven in turn according to the driving method of the above embodiment, that is, the first light emitting element RE of the pixel circuit P1 on each scanning line GL is driven in turn first, the second light emitting element GE of the pixel circuit P1 on each scanning line GL is driven in turn, and then the third light emitting element BE of the pixel circuit P1 on each scanning line GL is driven in turn, so that the display panel 100 displays red, green and blue image frames in turn in sequence, and the viewer can see a color picture by the effect of visual residue.

值得注意的是，在部分實施例中，如圖6所示，畫素電路P1的切換電路204也可不包括電晶體M12~M14，在此情形下，掃描驅動電路102可不需提供第三控制信號S3給切換電路204。It is worth noting that in some embodiments, as shown in FIG. 6 , the switching circuit 204 of the pixel circuit P1 may not include the transistors M12 - M14 . In this case, the scanning driver circuit 102 may not provide the third control signal S3 to the switching circuit 204 .

綜上所述，本實施例的驅動電流產生電路可依據資料電壓、第一發光控制信號、第二發光控制信號以及第三發光控制信號產生第一驅動電流、第二驅動電流或第三驅動電流，切換電路可依據第一發光控制信號、第二發光控制信號以及第三發光控制信號將驅動電流產生電路產生的第一驅動電流、第二驅動電流或第三驅動電流提供至對應的第一發光元件、第二發光元件或第三發光元件。相較於習知技術中一個發光元件需由對應的一個畫素電路以及一條資料線驅動，上述實施例的顯示面板及畫素電路將三個發光元件整合至一個畫素電路中，且一個畫素電路僅需使用一條資料線，因此可大幅縮減畫素電路面積的電路結構，而使顯示面板及畫素電路更適合應用於內嵌式指紋辨識顯示技術。In summary, the driving current generating circuit of the present embodiment can generate the first driving current, the second driving current or the third driving current according to the data voltage, the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal, and the switching circuit can provide the first driving current, the second driving current or the third driving current generated by the driving current generating circuit to the corresponding first light-emitting element, the second light-emitting element or the third light-emitting element according to the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal. Compared to the prior art in which one light-emitting element needs to be driven by a corresponding pixel circuit and a data line, the display panel and pixel circuit of the above embodiment integrate three light-emitting elements into one pixel circuit, and one pixel circuit only uses one data line, thereby greatly reducing the circuit structure of the pixel circuit area, making the display panel and pixel circuit more suitable for application in embedded fingerprint recognition display technology.

100:顯示面板 102:掃描驅動電路 104:資料驅動電路 P1:畫素電路 DL:資料線 GL:掃描線 202:驅動電流產生電路 204:切換電路 RE:第一發光元件 GE:第二發光元件 BE:第三發光元件 OVSS:接地電壓 D1:資料電壓 EMR[n]:第一發光控制信號 EMG[n]:第二發光控制信號 EMB[n]:第三發光控制信號 IR:第一驅動電流 IG:第二驅動電流 IB:第三驅動電流 M1~M14:電晶體 C1:電容 Vref1、Vref2:參考電壓 VRS:重置電壓 S1[n]:第一控制信號 S2[n]:第二控制信號 S3:第三控制信號 TCW:重置及寫入期間 TR、TG、TB:發光期間 100: Display panel 102: Scanning drive circuit 104: Data drive circuit P1: Pixel circuit DL: Data line GL: Scanning line 202: Drive current generating circuit 204: Switching circuit RE: First light-emitting element GE: Second light-emitting element BE: Third light-emitting element OVSS: Ground voltage D1: Data voltage EMR[n]: First light-emitting control signal EMG[n]: Second light-emitting control signal EMB[n]: Third light-emitting control signal IR: First drive current IG: Second drive current IB: Third drive current M1~M14: Transistor C1: Capacitor Vref1, Vref2: Reference voltage VRS: Reset voltage S1[n]: first control signal S2[n]: second control signal S3: third control signal TCW: reset and write period TR, TG, TB: luminescence period

圖1是依照本發明實施例的一種顯示面板的示意圖。圖2是依照本發明實施例的一種畫素電路的示意圖。圖3是依照本發明另一實施例的畫素電路的示意圖。圖4是依照本發明實施例的一種畫素電路的操作時序圖。圖5是依照本發明實施例的一種顯示面板的操作時序圖。圖6是依照本發明另一實施例的畫素電路的示意圖。 FIG. 1 is a schematic diagram of a display panel according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a pixel circuit according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a pixel circuit according to another embodiment of the present invention. FIG. 4 is an operation timing diagram of a pixel circuit according to an embodiment of the present invention. FIG. 5 is an operation timing diagram of a display panel according to an embodiment of the present invention. FIG. 6 is a schematic diagram of a pixel circuit according to another embodiment of the present invention.

202:驅動電流產生電路 202: Driving current generating circuit

204:切換電路 204: Switching circuit

P1:畫素電路 P1: Pixel circuit

DL:資料線 DL: Data Line

RE:第一發光元件 RE: The first light-emitting element

GE:第二發光元件 GE: Second light-emitting element

BE:第三發光元件 BE: The third light-emitting element

OVSS:接地電壓 OVSS: ground voltage

D1:資料電壓 D1: Data voltage

EMR[n]:第一發光控制信號 EMR[n]: first light control signal

EMG[n]:第二發光控制信號 EMG[n]: Second light control signal

EMB[n]:第三發光控制信號 EMB[n]: The third light control signal

IR:第一驅動電流 IR: First drive current

IG:第二驅動電流 IG: Second drive current

IB:第三驅動電流 IB: Third drive current

Claims

A pixel circuit includes: a driving current generating circuit coupled to a data line, receiving a data voltage from the data line, generating a first driving current, a second driving current or a third driving current according to the data voltage, a first light emitting control signal, a second light emitting control signal and a third light emitting control signal; a first light emitting element; a second light emitting element; a third light emitting element; and a switching circuit coupled to the driving current generating circuit and the first light emitting element, the second light emitting element and the third light emitting element, generating a first driving current, a second driving current or a third driving current according to the data voltage, a first light emitting control signal, a second light emitting control signal and a third light emitting control signal. The first driving current, the second driving current and the third driving current are respectively provided to the first light-emitting element, the second light-emitting element and the third light-emitting element according to the data line and the third light-emitting control signal, so as to drive the first light-emitting element, the second light-emitting element and the third light-emitting element to emit light respectively, wherein the driving current generating circuit comprises: a first transistor, one end of which is coupled to the data line, and the control end of the first transistor receives a first control signal; a second transistor, coupled between the other end of the first transistor and a first reference voltage, and the control end of the second transistor receives the first reference voltage; a light-emitting control signal; a third transistor coupled between the other end of the first transistor and a first reference voltage, the control end of the third transistor receiving the second light-emitting control signal; a fourth transistor coupled between the other end of the first transistor and a first reference voltage, the control end of the fourth transistor receiving the third light-emitting control signal; a capacitor, one end of which is coupled to the other end of the first transistor; a fifth transistor; a sixth transistor, the fifth transistor and the sixth transistor are connected in series between the other end of the capacitor and the output end of the driving current generating circuit, the fifth transistor and the The control end of the sixth transistor receives the first control signal; a seventh transistor is coupled between the common connection point of the fifth transistor and the sixth transistor and a second reference voltage, and the control end of the seventh transistor receives a second control signal; and an eighth transistor is coupled between a power voltage and the output end of the driving current generating circuit, and the control end of the eighth transistor is coupled to the other end of the capacitor. During a reset and write period, the second control signal first turns on the control end of the seventh transistor, and then the first control signal turns on the first transistor, the fifth transistor and the sixth transistor.

The pixel circuit as described in claim 1, wherein the switching circuit comprises: a ninth transistor coupled between the output end of the driving current generating circuit and the first light-emitting element, the control end of the ninth transistor receiving the first light-emitting control signal; a tenth transistor coupled between the output end of the driving current generating circuit and the second light-emitting element, the control end of the tenth transistor receiving the second light-emitting control signal; and an eleventh transistor coupled between the output end of the driving current generating circuit and the third light-emitting element, the control end of the eleventh transistor receiving the third light-emitting control signal.

The pixel circuit as described in claim 2, wherein during a light-emitting period, the first light-emitting control signal, the second light-emitting control signal, and the third light-emitting control signal turn on one of the second transistor, the third transistor, and the fourth transistor, and correspondingly turn on one of the ninth transistor, the tenth transistor, and the eleventh transistor.

A pixel circuit as described in claim 2, wherein the switching circuit comprises: a twelfth transistor coupled between a common connection point of the ninth transistor and the first light-emitting element and a reset voltage, the control end of the twelfth transistor receiving a third control signal; a thirteenth transistor coupled between a common connection point of the tenth transistor and the second light-emitting element and the reset voltage, the control end of the thirteenth transistor receiving the third control signal; and a fourteenth transistor coupled between a common connection point of the eleventh transistor and the second light-emitting element and the reset voltage, the control end of the fourteenth transistor receiving the third control signal, wherein the third control signal turns on the twelfth transistor, the tenth transistor and the fourteenth transistor during the reset and write period. .

The pixel circuit as described in claim 1, wherein the first light-emitting element, the second light-emitting element and the third light-emitting element are light-emitting diodes.

A display panel includes: a scanning drive circuit, providing a first light emission control signal, a second light emission control signal and a third light emission control signal; a data drive circuit, providing a data voltage; and a plurality of pixel circuits, coupled to the scanning drive circuit and the data drive circuit, each pixel circuit including: a drive current generating circuit, coupled to a data line, receiving the data voltage from the data drive circuit through the data line, and generating a first drive current, a second drive current or a third drive current according to the data voltage, the first light emission control signal, the second light emission control signal and the third light emission control signal; a first light emitting element; a second light emitting element; element; a third light-emitting element; and a switching circuit, coupling the driving current generating circuit and the first light-emitting element, the second light-emitting element and the third light-emitting element, providing the first driving current, the second driving current and the third driving current to the first light-emitting element, the second light-emitting element and the third light-emitting element respectively according to the first light-emitting control signal, the second light-emitting control signal and the third light-emitting control signal, so as to drive the first light-emitting element, the second light-emitting element and the third light-emitting element to emit light respectively, wherein the driving current generating circuit comprises: a first transistor, one end of which is coupled to the data line, and the control end of the first transistor receives a first a control signal; a second transistor coupled between the other end of the first transistor and a first reference voltage, the control end of the second transistor receiving the first light control signal; a third transistor coupled between the other end of the first transistor and a first reference voltage, the control end of the third transistor receiving the second light control signal; a fourth transistor coupled between the other end of the first transistor and a first reference voltage, the control end of the fourth transistor receiving the third light control signal; a capacitor, one end of which is coupled to the other end of the first transistor; a fifth transistor; a sixth transistor, the fifth transistor and the sixth transistor are connected in series to the other end of the capacitor. The first control signal is connected between the common connection point of the fifth transistor and the sixth transistor and the output terminal of the driving current generating circuit, and the control terminal of the fifth transistor and the sixth transistor receives the first control signal; a seventh transistor is coupled between the common connection point of the fifth transistor and the sixth transistor and a second reference voltage, and the control terminal of the seventh transistor receives a second control signal; and an eighth transistor is coupled between a power supply voltage and the output terminal of the driving current generating circuit, and the control terminal of the eighth transistor is coupled to the other end of the capacitor. During a reset and write period, the second control signal first turns on the control terminal of the seventh transistor, and then the first control signal turns on the first transistor, the fifth transistor and the sixth transistor.

The display panel as described in claim 6, wherein the switching circuit includes: a ninth transistor coupled between the output end of the driving current generating circuit and the first light-emitting element, the control end of the ninth transistor receiving the first light-emitting control signal; a tenth transistor coupled between the output end of the driving current generating circuit and the second light-emitting element, the control end of the tenth transistor receiving the second light-emitting control signal; and an eleventh transistor coupled between the output end of the driving current generating circuit and the third light-emitting element, the control end of the eleventh transistor receiving the third light-emitting control signal.

The display panel as described in claim 7, wherein during a light-emitting period, the first light-emitting control signal, the second light-emitting control signal, and the third light-emitting control signal turn on one of the second transistor, the third transistor, and the fourth transistor, and correspondingly turn on one of the ninth transistor, the tenth transistor, and the eleventh transistor.

A display panel as described in claim 7, wherein the switching circuit comprises: a twelfth transistor coupled between a common connection point of the ninth transistor and the first light-emitting element and a reset voltage, the control end of the twelfth transistor receiving a third control signal; a thirteenth transistor coupled between a common connection point of the tenth transistor and the second light-emitting element and the reset voltage, the control end of the thirteenth transistor receiving the third control signal; and a fourteenth transistor coupled between a common connection point of the eleventh transistor and the second light-emitting element and the reset voltage, the control end of the fourteenth transistor receiving the third control signal, wherein the third control signal turns on the twelfth transistor, the tenth transistor and the fourteenth transistor during the reset and write period.

The display panel as described in claim 6, wherein the first light-emitting element, the second light-emitting element and the third light-emitting element are light-emitting diodes.