201135702 六、發明說明： 【發明所屬之技術領域】 本發明是有關於顯示技術領域，且特別是有關於發光二極 體驅動電路與其驅動方法及顯示裝置。 【先前技術】 發光二極體（Light Emitting Diode, LED)顯示裝置之書 素一般係以電晶體搭配儲存電容來儲存電荷，以控制發光二極 體的亮度表現；其中發光二極體係一種電流驅動元件，其根據201135702 VI. Description of the Invention: [Technical Field] The present invention relates to the field of display technology, and in particular to a light-emitting diode driving circuit, a driving method thereof, and a display device. [Prior Art] A book of a Light Emitting Diode (LED) display device generally uses a transistor with a storage capacitor to store a charge to control the brightness performance of the light-emitting diode; wherein the light-emitting diode system is a current drive Component based on
流經的電流大小不同而產生不同程度的亮光。請參見圖丨，其 繪示為傳統發光二極體顯示裝置的單個晝素電路之示意圖。畫 素電路10作為單個發光模組，其包括發光二極體驅動電路^ 以及有機發光二極體16 ;發光二極體驅動電路12用以控制有 機發光二極體16之亮度表現，且為二電晶體一電容（^Tic) 架構具體地，發光一極體驅動電路12包括電晶體Ml、電晶 ，M2以及電容C1;電晶體M1的沒極因電性麵接關係而接收 貝料訊唬Vdata，電晶體Ml的閘極接受控制訊號SCAN之控 制以決定是否使資料訊號Vdata傳遞至電晶體M1的源極；電 晶體M2的閘極電性搞接至電晶體M1的源極，電晶體M2的 源極電性祕至電源電位qVDD，電晶體M2岐極電性相接 至有機發光二極體16的正極’有機發光二極體16的負極電性 輕接至另-電源電位〇vss;電容C1的兩端跨接於電晶體W 之閘極與源極之間。 Λ、、:而由於發光一極體顯示裝置的各個畫素電路的OVDD 電源線均連接在—起’當有機發光二極體16發糾，0VDD 電源線會有電赫L由於ονΐ)ϋ電上具有金屬阻 會產生電源電(亦即1R D_，使各個畫素電路 、’〜電位OVDD會有差異。由於有機發光二極體16的發光 4 201135702 亮度正比於流經的電流大小，而因各個晝素電路的電源電位 OVDD有所差異’會造成晝素電路與晝素電路之間電流的差 異，其所產生的亮度就會不同，因此造成面板顯示不均勻的現 象。另外，由於製程的影響，各個畫素電路的電晶體其臨界電 壓並非完全相同，使得即使給予相同的資料訊號，不同晝素電 路所產生的電流仍有差異，亦會導致面板顯示不均勻的現象。 【發明内容】The current flowing through is different in magnitude and produces varying degrees of light. Referring to the figure, it is a schematic diagram of a single pixel circuit of a conventional LED display device. The pixel circuit 10 is a single light-emitting module, and includes a light-emitting diode driving circuit and an organic light-emitting diode 16; the light-emitting diode driving circuit 12 is configured to control the brightness performance of the organic light-emitting diode 16 and is two In particular, the light-emitting one-pole driving circuit 12 includes a transistor M1, an electric crystal, an M2, and a capacitor C1; the pole of the transistor M1 receives the material information due to the electrical surface connection relationship. Vdata, the gate of the transistor M1 is controlled by the control signal SCAN to determine whether to transmit the data signal Vdata to the source of the transistor M1; the gate of the transistor M2 is electrically connected to the source of the transistor M1, the transistor The source of M2 is secreted to the power supply potential qVDD, and the transistor M2 is electrically connected to the positive electrode of the organic light-emitting diode 16. The negative electrode of the organic light-emitting diode 16 is electrically connected to another power supply potential 〇 vsss. The two ends of the capacitor C1 are connected between the gate and the source of the transistor W. Λ, , :: Since the OVDD power lines of the respective pixel circuits of the light-emitting one-pole display device are connected to each other - when the organic light-emitting diode 16 is corrected, the 0VDD power supply line has a power Hz L due to ονΐ) There is a metal resistance on the power supply (that is, 1R D_, so that each pixel circuit, '~ potential OVDD will be different. Because the brightness of the organic light-emitting diode 16 4 201135702 brightness is proportional to the current flowing through, and The difference in the power supply potential OVDD of each pixel circuit 'causes the difference in current between the pixel circuit and the pixel circuit, and the brightness generated by the difference will be different, thus causing uneven display of the panel. In addition, due to the process The effect is that the threshold voltages of the transistors of the respective pixel circuits are not completely the same, so that even if the same data signal is given, the current generated by the different pixel circuits is still different, which may result in uneven display of the panel.
本發明的目的是提供一種發光二極體驅動電路，以改呈先 前技術中面板顯示不均勻的問題。 ° 本發明的再一目的是提供一種發光二極體驅動方法以改 善先前技術中面板顯示不均勻的問題。 本發明的又一目的是提供一種顯示裝置，以改善先前技術 中面板顯示不均勻的問題。 本發明實施例提出的一種發光二極體驅動電路，適於驅動 發光二極體。其中，發光二極體驅動電路中有多個電晶體，且 每一電晶體包括控制端、第一通路端與第二通路端。具體地， 發光二極體驅動電路包括第—電晶體、第二電晶體三 體、單向導通it件以及電容。其中，第—電晶_ 2 = 控制以決定第-電晶體的第—通路端與第二通= 之間的電性導通狀態’第一電晶體的第—通路端因電性 係而接收資料訊號；第二電晶體的控制端電性 體的第二通路端，第—雷曰俨的坌 妾至第一電日日 位，第二雷曰ma:通路端電性耦接至預設電 曰㈣：電曰曰體第二通端電性耦接至發光二極體；第：電 曰曰體的控制端受第二訊號之控制以：-： 路端鱼b 乐一哥日日體的第一通 ^與第—通路端之間的電性導通狀態 路端電性輕接至上述之預設電位】:體2-通 干U守通7〇件的一端電性耦 201135702 ί 電的第二通路端，另—端因電性輕接關係而接收 晶體的控制二電晶體的第二通路端與第二電 通元件因為反向==考訊號在某-時段中會使單向導 明的—實施例中，上述之單向導通元件為二極體。 體，而日的一實施例中，上述之單向導通元件為第四電晶 而接收夫心二體的控制端與第—通路端同時因電性耗接關係SUMMARY OF THE INVENTION An object of the present invention is to provide a light emitting diode driving circuit to correct the problem of uneven display of panels in the prior art. Still another object of the present invention is to provide a light emitting diode driving method to improve the problem of panel display unevenness in the prior art. It is still another object of the present invention to provide a display device to improve the problem of uneven display of panels in the prior art. A light emitting diode driving circuit according to an embodiment of the invention is adapted to drive a light emitting diode. The light emitting diode driving circuit has a plurality of transistors, and each of the transistors includes a control end, a first path end and a second path end. Specifically, the LED driving circuit includes a first transistor, a second transistor, a unidirectional conduction device, and a capacitor. Wherein, the first electron crystal _ 2 = control determines the electrical conduction state between the first passage end and the second passage = of the first transistor. The first passage end of the first transistor receives the data due to the electrical system. a signal; a second path end of the control terminal of the second transistor, a first thunder to the first electric day, and a second thunder ma: the end is electrically coupled to the preset曰 (4): The second end of the electric body is electrically coupled to the light-emitting diode; the control end of the electric body is controlled by the second signal to: -: the road end fish b music music The electrical conduction state between the first pass and the first pass end is electrically connected to the above-mentioned preset potential]: one end of the body 2-through-dry U Guard 7-piece is electrically coupled to 201135702 ί The second path end of the second path end of the second transistor end of the control transistor of the second transistor due to the electrical connection relationship; the second pass end of the second transistor and the second pass element are reversed == the test signal will make a single guide in a certain period of time In the embodiment, the one-way conducting element described above is a diode. In an embodiment of the present invention, the unidirectional conduction element is a fourth electro-crystal, and the control terminal and the first-channel end of the receiving two-body are simultaneously electrically connected.
曰·^ ^戒號，第四電晶體的第二通路端電性輕接至第三電 日日體的第二通路端。 ％ 本發明實施例提出的一種發光二極體驅動方法，適用於上 述之發光二極體驅動電路中。具體地，發光二 法 =驟道⑴在第一時段中，調整第一訊號、第二訊號與參 1 =以導通第—電晶體鮮向導通元件，並使第三電晶體無法 導通，以及(2)在第-時段之後的第二時段中，調整第一訊號、 第二訊號與參考訊號以導通第三電晶體，並使第-電晶體與單 向導通元件無法導通。其巾’在第.二時段巾，單 因為反向偏壓而無法導通。 件疋 在本發明的一實施例中，上述之第一訊號與第二訊號反 相，且參考訊號與第二訊號同相。 本發明實施例提出的一種顯示裝置，包括電源供應裝置以 及發光源。其中，電源供應裝置用以提供電力；發光源電性耦 接至電源供應裝置以接受電力。具體地，發光源包括至少—個 發光模組，而發光模組包括發光二極體以及發光二極體驅動電 路。其中，發光二極體驅動電路中有多個電晶體，每一電晶體 包括控制端、第一通路端與第二通路端。更具體地，發光二極 體驅動電路包括第一電晶體、第二電晶體、第三電晶體、^向 201135702 導通元件以及電容；第一電晶體的控制端受第一訊號之控制以 決定第一電晶體的第一通路端與第二通路端之間的電性導通 狀態，第一電晶體的第一通路端因電性耦接關係而接收資料訊 號’第二電晶體的控制端電性耗接至第一電晶體的第二通路 端，第二電晶體的第一通路端電性搞接至由電源供應裝置提供 之預設電位，第二電晶體的第二通路端電性耦接至發光二極 體，第二電晶體的控制端受第二訊號之控制以決定第三電晶體 的第一通路與第·一通路端之間的電性導通狀態，第三電晶體 的第一通路端電性耦接至上述之預設電位；單向導通元件的一 春端電性麵接至第三電晶體的第二通路端’另一端因電性耦接關 係而接收參考訊號；電容電性耦接於第三電晶體的第二通路端 與第二電晶體的控制端之間。再者，參考訊號在某一時段中會 使單向導通元件因為反向偏壓而不導通。 在本發明的一實施例中，上述之顯示裝置的單向導通元件 為二極體。 在本發明的一實施例中’上述之顯示裝置的單向導通元件 為第四電晶體，第四電晶體的控制端與第一通路端同時因電性 • 耦接關係而接收參考訊號，第四電晶體的第二通路端電性耦接 至第三電晶體的第二通路端。 本發明實施例藉由對發光二極體驅動電路之結構配置進 行設計’使發光二極體驅動電路包括多個電晶體、以及單向導 通70件例如以二極體方式連接的電晶體，透過各個電晶體之間 的特定連接方式與控制方式以及基於鄰近電晶體的製程差異 很小可忽略之前提下，在發光二極體的發光階段，流經發光二 極體的電流與電晶體的臨界電壓以及預設電位大小基本無 關’因此可以抑制製程因素與電源電壓降對電流的影響，連到 201135702曰·^ ^ 戒号, the second path end of the fourth transistor is electrically connected to the second path end of the third electric day body. A method for driving a light-emitting diode according to an embodiment of the present invention is applicable to the above-described light-emitting diode driving circuit. Specifically, the second method of light emission = the first step (1), in the first period of time, adjusting the first signal, the second signal, and the reference 1 = to turn on the first transistor, and make the third transistor incapable of turning on, and 2) In the second period after the first period, the first signal, the second signal and the reference signal are adjusted to turn on the third transistor, and the first transistor and the unidirectional conduction element are not turned on. In the second period of time, the towel was unable to conduct due to reverse bias. In an embodiment of the invention, the first signal is opposite to the second signal, and the reference signal is in phase with the second signal. A display device according to an embodiment of the invention includes a power supply device and a light source. Wherein, the power supply device is used to provide power; the light source is electrically coupled to the power supply device to receive power. Specifically, the light source includes at least one light emitting module, and the light emitting module includes a light emitting diode and a light emitting diode driving circuit. The LED driving circuit has a plurality of transistors, and each of the transistors includes a control end, a first path end and a second path end. More specifically, the LED driving circuit includes a first transistor, a second transistor, a third transistor, a conduction element of the 201135702, and a capacitor; the control end of the first transistor is controlled by the first signal to determine the first The electrical conduction state between the first path end and the second path end of the transistor, the first path end of the first transistor receives the data signal by the electrical coupling relationship, and the control terminal electrical property of the second transistor The first path end of the second transistor is electrically connected to the preset potential provided by the power supply device, and the second path end of the second transistor is electrically coupled to the second path end of the second transistor. To the light emitting diode, the control end of the second transistor is controlled by the second signal to determine an electrical conduction state between the first path and the first path end of the third transistor, the first of the third transistor The path end is electrically coupled to the preset potential; a spring end of the single-conducting component is connected to the second path end of the third transistor, and the other end receives the reference signal due to the electrical coupling relationship; Electrically coupled to the third transistor Between the two pass ends and the control end of the second transistor. Furthermore, the reference signal will cause the unidirectional conduction element to be non-conducting due to reverse bias during a certain period of time. In an embodiment of the invention, the unidirectional conduction element of the display device is a diode. In an embodiment of the present invention, the unidirectional conduction component of the display device is a fourth transistor, and the control terminal of the fourth transistor receives the reference signal simultaneously with the first path end due to the electrical coupling relationship. The second path end of the fourth transistor is electrically coupled to the second path end of the third transistor. In the embodiment of the present invention, the structure configuration of the LED driving circuit is designed to make the LED driving circuit include a plurality of transistors, and a single-conducting 70-piece transistor, for example, connected in a diode manner, through the transistor. The specific connection mode and control mode between each transistor and the process based on the adjacent transistor are small and negligible. Before the light-emitting diode emits light, the current flowing through the light-emitting diode and the criticality of the transistor The voltage and the preset potential are basically independent of each other' so it can suppress the influence of process factors and power supply voltage drop on the current, connected to 201135702
較佳補償的效果，進而可有效改善先前技術中面板顯示不 之問題。 J 為讓本發明之上述和其他目的、特徵和優點能更明顯易 懂，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下。 【實施方式】 ° 參見圖2，其繪示出相關於本發明實施例之一種顯示裴置 的結構示意圖。如圖2所示，顯示裝置2〇包括電源供應裳置 21以及發光源23。其中，電源供應裝置21用以提供電力如 電源電位OVDD及0VSS ;發光源η電性祕至電源供應震 置21以接受電源電位〇VDD及〇vss。具體地，發光源^ 包括至少-個發光模組230，本實施例示出兩個以作為舉 但並非限制本發明。 各個發光模組230包括發光二極體例如有機發光二極體 232以及發光二極體驅動電路234。發光二極體驅動電路234 包括多個電晶體]VH、M2、M3、M4以及電容C。在本實施例 中，電晶體Ml、Μ2、Μ3及Μ4皆作為開關使用，每一電晶 體m、M2、M3及Μ4的間極、沒極與源極分別為開關的控 籲制端、第一通路端與第二通路端；並且電晶體M1、M2、⑽ 及M4構成用以决疋疋否使電流流過有機發光二極體说的開 關模組；更進-步的’電晶體M4係以二極體連接方式（亦即， 在此電晶體M4的閘極與源極電性連接)設置於發光二極體驅 動電路234中而作為單向導通元件。此外，冑晶體⑽及奶 為㈣電晶體，電晶體M2及刚為1>型電晶體，但本發明並 不以此為限。 更具體地’電晶體Ml的閘極受控制訊號SCAN之控制以 電晶體Ml的沒極與源極之間的電性導通狀態，電晶體mi的 201135702 沒極因電性輕接關係而接收資料訊號Vdata。電晶體M2的閘 極電性輕接至電晶體M1的源極，電晶體M2的源極電性搞接 至由電源供應襄置21提供之電源電位OVDD，電晶體M2的 沒極電性祕至有機發光二極體232的正極，而有機發光二極 體232的負極電性耦接至由電源供應裝置21提供之另一電源 電位ovss，在此，0VDD大於ovss。電晶體M3的閉極受 控制訊號EM之控制以決定電晶體M3的沒極與源極之間的電 性導通狀態’電晶體M3的沒極電性麵接至電源電位⑽DD。 電晶體M4的汲極電性麵接至電晶體M3的源極，電晶體· 的閘極與源極皆因電性搞接關係而接收參考訊號Μ。電容c 電性輕接於電晶體M3的源極與電晶體M2的間極之間，在 此’電容C與電晶體]\43的電性連接點標示為節點八，電容c 與電晶體]Vt2的電性連接點標示為節點〇。 另外需要說明的是，圖2中各個發光模組23〇所接收的控 制訊號SCAN，EM、資料訊號Vdata及參考訊號Vref以相同 兀件符號標示之’但並非用來限制：在同一時段，各個發光模 組230的控制訊號SCAN，EM、資料訊號Vdata及參考訊號 φ Vref之取值一定相同。 下面將結合圖2與圖3詳細描述任一發光二極體驅動電路 234的具體作動過程’圖3繪示出相關於發光二極體驅動電路 234之多個訊號SCAN、EM、Vdata及Vref的時序圖。 具體地’在T1 a寺段中，控制訊號SCAN被調整為高準位， 控制訊號EM與參考訊號Vref皆被調整為低準位且參考訊號 Vref的取值為V卜電晶體如處於導通狀態，電晶體戰在 此’亦即單向導通元件)亦係處於導通狀態，電晶體M3處於 截止狀態；此時，節點A處的電位為(V1+Vth4)，節點G處的 201135702 電位為Vdata，其中Vth4為電晶體M4的臨界電壓。 在T2時段中’控制訊號％崩被調整為低準位，控制訊 號EM與參考訊號Vref皆被調整為高準位且參考訊號Vref的 取值為V2(在此，V2大於V1)，電晶體M3處於導通狀態，電 晶體Ml處於截止狀態，電晶體厘4因反向偏壓而無法導通； 此時，節點A處的電位為〇VDD，節點G處的電位為 [Vdata+0VDD-(V1+Vth4)]，電晶體M2導通，流過有機發光二 極體 232 的電流 Ids=k(Vsg-Vth)2=k[(Vl • _Vdata)+(Vth4-Vth)]2 ’其中k為常數，做為電晶體M2的臨 界電壓。在此，對處於同一發光模組23〇的電晶體M2與電晶 體M4，基於鄰近電晶體的製程差異很小可忽略之前提下可認 為Vth4=Vth，因此Ids= k(Vl -Vdata)2。由此可見，有機發光 -極體232處於發光階段時所流過的電流Ids與電晶體的臨界 及電源㈣OVDD無關’可排除製程因素與電源電廢 降對電流的影響，達到補償的效果，進而可有效改善先前技術 十顯示不均勻之問題。 lit外，從® 3中還可以發現，於發光三極體驅動電路234 •的作動過財，控制訊號SCAN與控制訊號舰反相且參考 訊號Vref與控制訊號EM同相。 圖4⑷與圖4(b)分別緣示圖！所示發光二極體驅動電路12 二圖2所不發光一極體驅動電路234之臨界電壓偏移補償效果 \擬圖。圖4(a)及4(b)皆繪示出電晶體M2的臨界電壓為雜、 負漂移至(Vth-0.3)以及正漂移至(ν_ 3)三種情形下他vs 特性曲線。從圖4(a)及4(b)可以發現，本發明實施例之 *光-極體驅動電路234具有較佳的臨界電壓偏移補償效果。 圖5(a)與圖5(b)分別繪示目i所示發光二極體驅動電路12 201135702 與圖2所示發光二極體驅動電路234之電源電㈣補償效果模 擬圖圖5(a)及5(b)皆綠示出電源電位的取值為〇vdd、〇vdd 變化5%以及0VDD變化10%三種情形下Ids vs. Vdata特性曲 線。從圖5⑷及5(b)可以發現，本發明實施例之發光二極體驅 動電路234具有較佳的電源電壓降補償效果。 ”ντ、上所述’本發明實施例藉由對發光二極體驅動電路之結 構配置進行設計’使發光二極體_電路包括多個電晶體、以 j向導通it件例如以二極體方式連接的電晶體，透過各個電 i:程方式與控制方式以及基於鄰近電晶體的 異很小可忽略之前提下，在發光二極體的發光階段，流 一極體的電流與電晶體的臨界電壓以及電源電位大小 塑，因此可以抑制製程因素與電源電壓降對電流的影 較鋪伽效果’㈣可妓轉先前技射面板顯 不不均勻之問題。 發来此可熟習此技藝者還可對本發明上述實施例提出的 動電路以及驅動方法作適當變更，例如將發光二 極中的電晶體M4變更為二極體，二極體的正 參考心v至即點A ’且二極體的負極因電性麵接關係而接收 各ί適當變更電晶體之種類(p型或N型）；及/或將 各個電sa體的源極歧極之€連㈣係互換等等。 路^本發明已以較佳實關難如上，然其並非用以限定 内，去可作壬Γί習此技藝者’在不脫離本發明之精神和範圍 附之之更動與潤飾’因此本發明之賴範圍當視後 附之申请專利範圍所界定者為準。 【圖式簡單說明】 圖Η 會示為傳統發光二極體顯示裝置的單個晝素電路之 201135702 示意圖。 圖2繪示出相關於本發明實施例之一種顯示裝置的結構 示意圖。 圖3繪示出相關於圖2所示發光二極體驅動電路之多個訊 號的時序圖。 圖4(a)與圖4(b)分別繪示圖1所示發光二極體驅動電路與 圖2所示發光二極體驅動電路之臨界電壓偏移補償效果模擬 圖。 圖5(a)與圖5(b)分別繪示圖1所示發光二極體驅動電路與 • 圖2所示發光二極體驅動電路之電源電壓降補償效果模擬圖。 【主要元件符號說明】 10 :晝素電路 12 :發光二極體驅動電路 16 :有機發光二極體 Vdata :資料訊號 SCAN :控制訊號 OVDD、OVSS :電源電位 • Ml、M2 :電晶體 C1 :電容 20 :顯示裝置 21 :電源供應裝置 23 :發光源 230:發光模組 232 :有機發光二極體 234 :發光二極體驅動電路 EM :控制訊號 12 201135702The effect of the better compensation can further improve the problem of panel display in the prior art. The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the appended claims. [Embodiment] ° Referring to Fig. 2, there is shown a schematic structural view of a display device in accordance with an embodiment of the present invention. As shown in FIG. 2, the display device 2A includes a power supply slot 21 and a light source 23. The power supply device 21 is configured to supply power such as the power supply potentials OVDD and 0VSS; the light source η is electrically sensitive to the power supply shock 21 to receive the power supply potentials VDD and 〇 vss. Specifically, the illuminating source includes at least one illuminating module 230, and the present embodiment shows two as an illustration, but not a limitation of the present invention. Each of the light emitting modules 230 includes a light emitting diode such as an organic light emitting diode 232 and a light emitting diode driving circuit 234. The LED driving circuit 234 includes a plurality of transistors]VH, M2, M3, M4 and a capacitor C. In this embodiment, the transistors M1, Μ2, Μ3, and Μ4 are used as switches, and the interpole, the immersion and the source of each of the transistors m, M2, M3, and Μ4 are the control terminals of the switch, respectively. a path end and a second path end; and the transistors M1, M2, (10) and M4 form a switch module for determining whether current flows through the organic light emitting diode; a further step of the 'transistor M4 The diode connection mode (that is, the gate of the transistor M4 is electrically connected to the source) is provided in the LED driving circuit 234 as a unidirectional conduction element. Further, the germanium crystal (10) and the milk are (iv) transistors, the transistor M2 and the just-type 1> type of transistor, but the invention is not limited thereto. More specifically, the gate of the transistor M1 is controlled by the control signal SCAN with the electrical conduction between the gate and the source of the transistor M1, and the 201135702 of the transistor mi receives the data due to the electrical contact relationship. Signal Vdata. The gate of the transistor M2 is electrically connected to the source of the transistor M1, and the source of the transistor M2 is electrically connected to the power supply potential OVDD provided by the power supply device 21, and the polarity of the transistor M2 is not very strong. To the anode of the organic light-emitting diode 232, the cathode of the organic light-emitting diode 232 is electrically coupled to another power supply potential ovss provided by the power supply device 21, where 0VDD is greater than ovss. The closed end of the transistor M3 is controlled by the control signal EM to determine the electrical conduction state between the electrode and the source of the transistor M3. The non-polarity of the transistor M3 is connected to the power supply potential (10) DD. The gate of the transistor M4 is electrically connected to the source of the transistor M3, and the gate and the source of the transistor receive the reference signal 因 due to the electrical connection. The capacitor c is electrically connected between the source of the transistor M3 and the interpole of the transistor M2. Here, the electrical connection point of the capacitor C and the transistor is labeled as node eight, the capacitor c and the transistor. The electrical connection point of Vt2 is marked as node 〇. It should be noted that the control signals SCAN, EM, data signal Vdata and reference signal Vref received by the respective illumination modules 23 in FIG. 2 are marked with the same element symbols, but are not used to limit: at the same time, each The control signals SCAN, EM, data signal Vdata and reference signal φ Vref of the illumination module 230 must have the same value. A specific operation process of any of the LED driving circuits 234 will be described in detail below with reference to FIG. 2 and FIG. 3. FIG. 3 illustrates a plurality of signals SCAN, EM, Vdata, and Vref related to the LED driving circuit 234. Timing diagram. Specifically, in the T1 a temple segment, the control signal SCAN is adjusted to a high level, the control signal EM and the reference signal Vref are both adjusted to a low level, and the reference signal Vref is taken as a value. The transistor warfare is also in the on state, and the transistor M3 is in the off state; at this time, the potential at node A is (V1+Vth4), and the potential at 201135702 at node G is Vdata. Where Vth4 is the threshold voltage of transistor M4. In the T2 period, the control signal % collapse is adjusted to the low level, the control signal EM and the reference signal Vref are both adjusted to the high level and the reference signal Vref is taken as the value V2 (here, V2 is greater than V1), the transistor M3 is in the on state, the transistor M1 is in the off state, and the transistor PCT 4 cannot be turned on due to the reverse bias; at this time, the potential at the node A is 〇VDD, and the potential at the node G is [Vdata+0VDD-(V1). +Vth4)], the transistor M2 is turned on, and the current flowing through the organic light-emitting diode 232 is Ids=k(Vsg-Vth)2=k[(Vl • _Vdata)+(Vth4-Vth)]2 'where k is a constant As the threshold voltage of the transistor M2. Here, for the transistor M2 and the transistor M4 in the same light-emitting module 23A, the process difference based on the adjacent transistor is small and negligible, and Vth4=Vth can be considered as before, so Ids=k(Vl - Vdata)2 . It can be seen that the current Ids flowing when the organic light-emitting body 232 is in the light-emitting phase is independent of the criticality of the transistor and the power supply (IV) OVDD, which can eliminate the influence of the process factor and the power supply voltage drop on the current, and achieve the compensation effect. The problem of uneven display of the prior art ten can be effectively improved. In addition to lit, it can also be seen from the ® 3 that the control signal SCAN is in anti-phase with the control signal ship and the reference signal Vref is in phase with the control signal EM. Figure 4 (4) and Figure 4 (b) respectively show the picture! The light-emitting diode driving circuit 12 shown in FIG. 2 has a threshold voltage offset compensation effect of the non-light-emitting one-pole driving circuit 234. 4(a) and 4(b) both show the vs characteristic curve of the transistor M2 with the threshold voltage being heterogeneous, negative drift to (Vth-0.3), and positive drift to (ν_3). 4(a) and 4(b), it can be seen that the photo-polar body driving circuit 234 of the embodiment of the present invention has a better threshold voltage offset compensation effect. FIG. 5( a ) and FIG. 5( b ) respectively show the power supply (four) compensation effect simulation diagram of the light-emitting diode driving circuit 12 201135702 and the light-emitting diode driving circuit 234 shown in FIG. 2 respectively. And 5(b) are both green and show the Ids vs. Vdata characteristic curve for the power supply potential values 〇vdd, 〇vdd change 5%, and 0VDD change 10%. As can be seen from Figures 5(4) and 5(b), the LED driver circuit 234 of the embodiment of the present invention has a better power supply voltage drop compensation effect. "ντ, the above description" is an embodiment of the present invention by designing the structural configuration of the LED driving circuit. The LED module includes a plurality of transistors, and the gate is connected to the device, for example, by a diode. The mode-connected transistor is passed through each of the electrical i: mode and control mode and the difference based on the adjacent transistor is negligible. In the light-emitting phase of the light-emitting diode, the current of the one-pole body and the transistor are The threshold voltage and the power supply potential are plasticized, so that the process factor and the power supply voltage drop can be suppressed from affecting the current. (4) The problem that the previous technical panel is not uneven can be reduced. The dynamic circuit and the driving method proposed in the above embodiments of the present invention can be appropriately changed. For example, the transistor M4 in the light emitting diode is changed to a diode, and the positive reference voltage v of the diode is the point A' and the diode. The negative poles are electrically connected to each other to receive the appropriate type of transistor (p-type or N-type); and/or to interchange the source-dipoles of the respective sa-body (four). The invention has been compared It is difficult to achieve the above, but it is not intended to be used in the following, and it is intended to be used by those skilled in the art without departing from the spirit and scope of the invention. The definition of the scope of the patent application shall prevail. [Simplified description of the drawings] Figure Η shows a schematic diagram of 201135702 of a single pixel circuit of a conventional light-emitting diode display device. Figure 2 illustrates a display related to an embodiment of the present invention. FIG. 3 is a timing diagram of a plurality of signals related to the LED driving circuit shown in FIG. 2. FIG. 4(a) and FIG. 4(b) respectively show the illumination shown in FIG. The simulation diagram of the threshold voltage offset compensation effect of the polar body driving circuit and the light emitting diode driving circuit shown in Fig. 2. Fig. 5(a) and Fig. 5(b) respectively show the light emitting diode driving circuit of Fig. 1 and • Figure 2 shows the simulation diagram of the power supply voltage drop compensation effect of the LED driver circuit. [Main component symbol description] 10: Alizarin circuit 12: LED driver circuit 16: Organic light-emitting diode Vdata: Data signal SCAN: Control signals OVDD, OVSS: Electricity Source potential • Ml, M2: transistor C1: capacitor 20: display device 21: power supply device 23: illumination source 230: illumination module 232: organic light-emitting diode 234: light-emitting diode drive circuit EM: control signal 12 201135702
Vref :參考訊號 M3、M4 :電晶體 C :電容 A、G :節點 VI、V2 :參考訊號的取值 ΤΙ、T2 :時段Vref : Reference signal M3, M4 : Transistor C : Capacitor A, G : Node VI, V2 : Value of reference signal ΤΙ, T2 : Period
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