TWI727565B - Display panel and driving method - Google Patents

Display panel and driving method Download PDF

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TWI727565B
TWI727565B TW108147716A TW108147716A TWI727565B TW I727565 B TWI727565 B TW I727565B TW 108147716 A TW108147716 A TW 108147716A TW 108147716 A TW108147716 A TW 108147716A TW I727565 B TWI727565 B TW I727565B
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current
light
data line
emitting diode
electrically connected
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TW108147716A
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TW202125476A (en
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陳忠君
莊勝鈞
周蔣云
陳伯綸
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大陸商業成科技（成都）有限公司
大陸商業成光電（深圳）有限公司
英特盛科技股份有限公司
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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]

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present disclosure provides a display panel including: m gate lines; n data lines; m gate lines and n data lines are insulated to define a plurality of sub-pixels; a plurality of light emitting diodes, each light emitting diode located in a sub-pixel, wherein a reverse bias current is produced when the light emitting diode is in a non-working state; n current sources, wherein each current source has an output current and is located in a sub-pixel; a driver electrically connected with the gate lines and the n data lines. The driver is configured to control the working state of each light emitting diode and each current source. The driver is also configured to control the reverse bias current and the output current to drive the plurality of light emitting diodes that is in working state. The present disclosure provides a driving method.

Description

顯示面板及驅動方法 Display panel and driving method

本發明涉及圖像顯示技術領域，尤其涉及一種顯示面板及應用於該顯示面板的驅動方法。 The present invention relates to the field of image display technology, and in particular to a display panel and a driving method applied to the display panel.

習知技術中，微型發光二極體顯示器在顯示面板上定義有陣列式排布的複數畫素區域，每一畫素區域包括複數子畫素，每一子畫素中設置有一微型發光二極體，藉由驅動器輸出驅動訊號至各個微型發光二極體，可控制各個微型發光二極體發光或關閉，藉由各個微型發光二極體的發光配合，以實現微型發光二極體顯示器顯示不同的畫面。其中，微型發光二極體具有“正嚮導通反向截止”的特性，也即，若該微型發光二極體的正極電壓高於負極電壓且正負極壓差大於該微型發光二極體的開啟電壓，則此時該微型發光二極體導通，具有一導通電流，且發光輝度與導通電流呈正比；若該微型發光二極體的正極電壓低於負極電壓且正負極壓差小於該微型發光二極體的崩潰電壓，則此時該微型發光二極體截止不發光，具有一反向偏置電流，該反向偏置電流極小，接近於零。 In the prior art, a micro light-emitting diode display defines a plurality of pixel regions arranged in an array on the display panel, each pixel region includes a plurality of sub-pixels, and each sub-pixel is provided with a micro light-emitting diode By the driver output driving signal to each micro light emitting diode, each micro light emitting diode can be controlled to emit light or turn off, and the light emission of each micro light emitting diode can be matched to realize the different display of the micro light emitting diode display. Picture. Among them, the micro light emitting diode has the characteristic of "forward conduction and reverse cutoff", that is, if the positive electrode voltage of the micro light emitting diode is higher than the negative electrode voltage and the voltage difference between the positive and negative electrodes is greater than the opening of the micro light emitting diode Voltage, the miniature light-emitting diode is turned on at this time, has a conduction current, and the luminescence brightness is proportional to the conduction current; if the anode voltage of the miniature light-emitting diode is lower than the cathode voltage and the voltage difference between the anode and the cathode is smaller than the miniature light-emitting diode The breakdown voltage of the diode means that the miniature light-emitting diode is cut off and does not emit light, and has a reverse bias current. The reverse bias current is extremely small and close to zero.

雖然反向偏置電流極小，但顯示面板上微型發光二極體數量較大，各個微型發光二極體的反向偏置電流方向相同，經過累加，可形成較大的反向偏置電流總和，該反向偏置電流總和會影響微型發光二極體顯示器的畫面質量，造成畫面對比度下降。 Although the reverse bias current is extremely small, the number of micro light-emitting diodes on the display panel is large, and the reverse bias current direction of each micro light-emitting diode is the same. After accumulation, a larger sum of reverse bias currents can be formed , The sum of the reverse bias current will affect the picture quality of the miniature light-emitting diode display and cause the picture contrast to decrease.

本發明一方面提供一種顯示面板，包括：m條閘極線，沿第一方向相互間隔排列，其中m>2；n條資料線，沿第二方向相互間隔排列，其中n>2，所述m條閘極線與所述n條資料線絕緣交叉設置，所述m條閘極線與所述n條資料線絕緣交叉定義複數子畫素；複數發光二極體，每一發光二極體形成於一子畫素中，每一發光二極體分別電連接定義發光二極體所在子畫素的一條資料線及一條閘極線，每一發光二極體在處於非工作狀態時，具有一反偏電流；n個電流源，每一電流源具有一輸出電流，每一電流源形成於一子畫素中，每一電流源分別電連接定義電流源所在子畫素的一條資料線及一條閘極線，每個電流源連接不同的資料線；以及驅動器，電連接所述m條閘極線及所述n條資料線，所述驅動器用於控制每個發光二極體及每個電流源的工作狀態，並用於控制所述反偏電流及所述輸出電流驅動當前處於工作狀態的發光二極體發光。 One aspect of the present invention provides a display panel, including: m gate lines arranged at intervals in a first direction, where m>2; n data lines arranged at intervals in a second direction, where n>2, said m gate lines and the n data lines are insulated and crossed, and the m gate lines and the n data lines are insulated and crossed to define a plurality of sub-pixels; a plurality of light-emitting diodes, each light-emitting diode Formed in a sub-pixel, each light-emitting diode is electrically connected to a data line and a gate line that define the sub-pixel where the light-emitting diode is located. When each light-emitting diode is in a non-working state, it has A reverse bias current; n current sources, each current source has an output current, each current source is formed in a sub-pixel, each current source is electrically connected to a data line defining the sub-pixel where the current source is located and A gate line, each current source is connected to a different data line; and a driver, which electrically connects the m gate lines and the n data lines, and the driver is used to control each light-emitting diode and each The working state of the current source is used to control the reverse bias current and the output current to drive the light-emitting diode currently in the working state to emit light.

本發明另一方面提供一種驅動方法，應用於如上述的顯示面板；驅動方法包括如下步驟：獲取當前處於工作狀態的發光二極體的目標驅動電流；獲取各條資料線上的初始電流，每條資料線上的初始電流為資料線所電連接的當前處於非工作狀態的各個發光二極體的反偏電流與資料線所電連接的電流源的輸出電流的疊加及；以及根據目標驅動電流及初始電流，輸出驅動訊號至各條資料線。 Another aspect of the present invention provides a driving method, which is applied to the above-mentioned display panel; the driving method includes the following steps: obtaining the target driving current of the light-emitting diode currently in working state; obtaining the initial current on each data line, each The initial current on the data line is the superposition of the reverse bias current of each light-emitting diode that is electrically connected to the data line and the output current of the current source electrically connected to the data line; and according to the target drive current and the initial Current, output driving signal to each data line.

本發明實施例提供的顯示面板，包括複數發光二極體及複數電流源，每個發光二極體在處於非工作狀態時雖不發光但具有一反偏電流，每個電流源具有一輸出電流，利用驅動器控制反偏電流及輸出電流驅動當前處於工作狀態的發光二極體發光，可將發光二極體的反偏電流利用起來進行圖像顯示， 一方面有利於消除反偏電流對顯示的影響，改善顯示面板的畫面顯示效果、提高畫面對比度，另一方面方面也有利於節省顯示面板的電能。 The display panel provided by the embodiment of the present invention includes a plurality of light-emitting diodes and a plurality of current sources, each light-emitting diode does not emit light when in a non-working state, but has a reverse bias current, and each current source has an output current , Use the driver to control the reverse bias current and output current to drive the light emitting diode currently in working state to emit light, and the reverse bias current of the light emitting diode can be used for image display, On the one hand, it is beneficial to eliminate the influence of the reverse bias current on the display, improve the picture display effect of the display panel, and increase the picture contrast. On the other hand, it is also beneficial to save the power of the display panel.

10:顯示面板 10: Display panel

11:基板 11: substrate

12:子畫素 12: Sub-pixel

13:發光二極體 13: Light-emitting diode

14:電流源 14: current source

15:驅動器 15: drive

151:顯示驅動模塊 151: Display driver module

1511:電流控制單元 1511: current control unit

1512:開關單元 1512: switch unit

GL、GL1、GL2、GLm:閘極線 GL, GL1, GL2, GLm: gate line

SL、SL1、SL2、SLn:資料線 SL, SL1, SL2, SLn: data line

S1、S2、S3、S4、S5、S6:步驟 S1, S2, S3, S4, S5, S6: steps

圖1為本發明實施例一提供的顯示面板的平面結構示意圖。 FIG. 1 is a schematic diagram of a planar structure of a display panel provided by Embodiment 1 of the present invention.

圖2為圖1中顯示面板的平面結構的另一示意圖。 FIG. 2 is another schematic diagram of the planar structure of the display panel in FIG. 1.

圖3為圖2中開關單元的電路結構示意圖。 FIG. 3 is a schematic diagram of the circuit structure of the switch unit in FIG. 2.

圖4為本發明其他實施例中顯示面板的平面結構示意圖。 FIG. 4 is a schematic diagram of a planar structure of a display panel in other embodiments of the present invention.

圖5為圖1顯示面板中子畫素分佈示意圖。 FIG. 5 is a schematic diagram of the distribution of sub-pixels in the display panel of FIG. 1.

圖6為圖1中顯示面板工作過程中輸出至各條閘極線的驅動訊號的波形示意圖。 FIG. 6 is a schematic diagram of waveforms of driving signals output to each gate line during the operation of the display panel in FIG. 1.

圖7為發光二極體的V-I特性曲線示意圖。 Fig. 7 is a schematic diagram of the V-I characteristic curve of a light-emitting diode.

圖8為本發明實施例一提供的驅動方法的流程示意圖。 FIG. 8 is a schematic flowchart of a driving method provided by Embodiment 1 of the present invention.

圖9為圖2中顯示面板的局部結構示意圖。 FIG. 9 is a schematic diagram of a partial structure of the display panel in FIG. 2.

圖10為本發明實施例一提供的顯示面板中一發光二極體相關的訊號時序圖。 FIG. 10 is a timing diagram of signals related to a light-emitting diode in the display panel provided by the first embodiment of the present invention.

圖11為發射不同顏色光的發光二極體的發光輝度-驅動電流特性曲線對照示意圖。 FIG. 11 is a schematic diagram showing the comparison of luminous brightness-driving current characteristic curves of light-emitting diodes emitting light of different colors.

圖12為本發明實施例二提供的驅動方法的流程示意圖。 FIG. 12 is a schematic flowchart of a driving method provided in Embodiment 2 of the present invention.

圖13為本發明實施例二提供的顯示面板中一發光二極體相關的訊號時序圖。 FIG. 13 is a signal timing diagram related to a light-emitting diode in the display panel provided by the second embodiment of the present invention.

圖14為本發明一變更實施例中的顯示面板的平面結構示意圖。 FIG. 14 is a schematic diagram of a plan structure of a display panel in a modified embodiment of the present invention.

實施例一 Example one

請參閱圖1，本實施例提供的顯示面板10，包括基板11、形成於基板11上的m條閘極線(GL1至GLm，m>2)及n條資料線(SL1至SLn，n >2)，各條閘極線相互平行間隔排列，各條資料線相互平行排列，m條閘極線與n條資料線相互絕緣交叉以定義出陣列式排列的複數子畫素12，如圖1中所示的，將X方向定義為子畫素陣列的行方向，Y方向定義為子畫素陣列的列方向。 1, the display panel 10 provided by this embodiment includes a substrate 11, m gate lines (GL1 to GLm, m>2) formed on the substrate 11, and n data lines (SL1 to SLn, n >2), the gate lines are arranged in parallel and spaced apart, and the data lines are arranged in parallel to each other. The m gate lines and n data lines are insulated and crossed to define a plurality of sub-pixels 12 arranged in an array, as shown in the figure As shown in 1, the X direction is defined as the row direction of the sub-pixel array, and the Y direction is defined as the column direction of the sub-pixel array.

請繼續參閱圖1，顯示面板10還包括設置於基板11上的複數發光二極體13，每一發光二極體13位於一子畫素12內。每一發光二極體13具有一正極及一負極，每個發光二極體13的正極與定義出其所在的子畫素12的閘極線GL電連接，負極與定義出其所在的子畫素12的資料線SL電連接。位於陣列同一行的各個發光二極體13電連接同一閘極線GL，位於陣列同一列的各個發光二極體13電連接同一資料線SL。本實施例中，發光二極體13可以為微型發光二極體(Micro-Light Emit Diode，Micro-LED)，尺寸在100微米以下，然在其他實施例中發光二極體13的尺寸不在此限。 Please continue to refer to FIG. 1, the display panel 10 further includes a plurality of light-emitting diodes 13 disposed on the substrate 11, and each light-emitting diode 13 is located in a sub-pixel 12. Each light-emitting diode 13 has a positive electrode and a negative electrode. The positive electrode of each light-emitting diode 13 is electrically connected to the gate line GL that defines the sub-pixel 12 where it is located, and the negative electrode is connected to the sub-picture where it is defined. The data line SL of the element 12 is electrically connected. Each light emitting diode 13 located in the same row of the array is electrically connected to the same gate line GL, and each light emitting diode 13 located in the same column of the array is electrically connected to the same data line SL. In this embodiment, the light-emitting diode 13 may be a micro-light-emitting diode (Micro-Light Emit Diode, Micro-LED) with a size below 100 microns, but in other embodiments the size of the light-emitting diode 13 is not here. limit.

請繼續參閱圖1，顯示面板10還包括複數電流源14，每一電流源14形成於一子畫素12中。本實施例中，電流源14的數量與資料線SL的數量相等，各個電流源14分別電連接定義出其所在的子畫素12的一資料線SL及一閘極線GL。本實施例中，各個電流源14電連接同一條閘極線GL，也即，各個電流源14分別位於處於陣列同一行的子畫素12中。本實施例中，各個電流源14電連接第m條閘極線(也即閘極線GLm)，且本實施例中，第m條閘極線(閘極線GLm)為最靠近驅動器15的一條閘極線。也即，基板11上，最靠近驅動器15的一行子畫素12中一一對應設置一電流源14，其餘子畫素12中一一對應設置一發光二極體13。每個電流源14在被開啟時，具有一恒定的輸出電流ip，該輸出電流ip疊加至電流源14所電連接的資料線SL上，用於驅動當前處於工作狀態的發光二極體13。 Please continue to refer to FIG. 1, the display panel 10 further includes a plurality of current sources 14, and each current source 14 is formed in a sub-pixel 12. In this embodiment, the number of current sources 14 is equal to the number of data lines SL, and each current source 14 is electrically connected to a data line SL and a gate line GL that define the sub-pixel 12 in which it is located. In this embodiment, each current source 14 is electrically connected to the same gate line GL, that is, each current source 14 is respectively located in the sub-pixels 12 in the same row of the array. In this embodiment, each current source 14 is electrically connected to the mth gate line (that is, gate line GLm), and in this embodiment, the mth gate line (gate line GLm) is the closest to the driver 15 One gate line. That is, on the substrate 11, one row of sub-pixels 12 closest to the driver 15 is provided with a current source 14 in one-to-one correspondence, and the remaining sub-pixels 12 are provided with a light-emitting diode 13 in a one-to-one correspondence. When each current source 14 is turned on, it has a constant output current i p , and the output current i p is superimposed on the data line SL electrically connected to the current source 14 for driving the light emitting diode currently in working state 13.

各個發光二極體13用於藉由發光進行圖像顯示，而各個電流源14僅用於提供一恒定的輸出電流ip而不發光，因此基板11上設置電流源14的子畫素不參與圖像顯示。本實施例中藉由將各個電流源14設置為電連接最靠近驅動 器15的那條閘極線GLm，有利於改善設置電流源14的各個子畫素12對圖像顯示的影響。於其他實施例中，可將各個電流源14設置為電連接最遠離驅動器15的那條閘極線GL1。 Each light-emitting diode 13 is used for image display by emitting light, and each current source 14 is only used for providing a constant output current i p without emitting light. Therefore, the sub-pixels provided with the current source 14 on the substrate 11 do not participate in the image display. Image display. In this embodiment, by setting each current source 14 to be electrically connected to the gate line GLm closest to the driver 15, it is beneficial to improve the influence of each sub-pixel 12 of the current source 14 on the image display. In other embodiments, each current source 14 may be configured to be electrically connected to the gate line GL1 furthest away from the driver 15.

請繼續參閱圖1，顯示面板10還包括設置於基板11上的驅動器15，驅動器15與m條閘極線及n條資料線電連接，用於控制每個發光二極體13及每個電流源14的工作狀態；也即，用於控制各個發光二極體13的發光或關閉，並用於控制各個電流源14的開啟與關閉。 Please continue to refer to FIG. 1, the display panel 10 also includes a driver 15 disposed on the substrate 11. The driver 15 is electrically connected to m gate lines and n data lines for controlling each light-emitting diode 13 and each current The working state of the source 14; that is, it is used to control the light-emitting or turn-off of each light-emitting diode 13, and it is used to control the turn-on and turn-off of each current source 14.

請參閱圖2，本實施例中，驅動器15包括複數顯示驅動模塊151，一一對應與多條資料線SL電連接。複數顯示驅動模塊151用於根據各條資料線SL1至SLn上的初始電流而輸出驅動訊號至各條資料線SL驅動發光二極體13發光以進行圖像顯示。本實施例中，所述驅動訊號為電流驅動訊號，每一顯示驅動模塊151包括相互電連接的電流控制單元1511及開關單元1512，開關單元1512電連接於資料線SL與電流控制單元1511之間。本實施例中的開關單元的電路結構如圖3所示，其中，x端為輸入端，電連接資料線SL；f端為輸出端，電連接電流控制單元1511；s端與

Figure 108147716-A0305-02-0007-1
端為控制端，電連接驅動器15中的時序控制端口，根據s端與
Figure 108147716-A0305-02-0007-2
端的輸入的時序訊號，可控制開關單元1512導通或開路。開關導通時，輸出端f端輸出的電訊號為開關單元1512所電連接的資料線SL上的初始電流。 Please refer to FIG. 2. In this embodiment, the driver 15 includes a plurality of display driving modules 151, which are electrically connected to a plurality of data lines SL in a one-to-one correspondence. The plurality of display driving modules 151 are used for outputting driving signals to each data line SL according to the initial current on each data line SL1 to SLn to drive the light emitting diode 13 to emit light for image display. In this embodiment, the driving signal is a current driving signal, and each display driving module 151 includes a current control unit 1511 and a switch unit 1512 that are electrically connected to each other, and the switch unit 1512 is electrically connected between the data line SL and the current control unit 1511 . The circuit structure of the switch unit in this embodiment is shown in FIG. 3, wherein the x terminal is the input terminal, which is electrically connected to the data line SL; the f terminal is the output terminal, which is electrically connected to the current control unit 1511; and the s terminal is connected to the current control unit 1511.
Figure 108147716-A0305-02-0007-1
Terminal is the control terminal, which is electrically connected to the timing control port in the driver 15, according to the s terminal and
Figure 108147716-A0305-02-0007-2
The input timing signal of the terminal can control the switch unit 1512 to be turned on or open. When the switch is turned on, the electrical signal output from the output terminal f is the initial current on the data line SL electrically connected to the switch unit 1512.

請繼續參閱圖2，本實施例中，電流控制單元1511為受控源，例如為電流控制電流源或電壓控制電流源。電流控制電流源具有一固定的輸入電流(所述初始電路)與輸出電流(所述電流驅動訊號)之間的函數關係，電流控制單元1511電流控制電壓源時，根據資料線SL上的初始電流分別輸出一電流訊號至資料線SL以驅動發光二極體13發光。電壓控制電流源具有一固定的輸入電壓(與所述電流驅動訊號具有一固定函數關係)與輸出電流(所述電流驅動訊號)之間的函數關係，根據資料線SL上的初始電流，確定一與初始電流對 應的輸入電壓，並根據所述輸入電壓輸出一電流訊號至各條資料線SL以驅動發光二極體13發光。 Please continue to refer to FIG. 2. In this embodiment, the current control unit 1511 is a controlled source, such as a current control current source or a voltage control current source. The current control current source has a fixed functional relationship between the input current (the initial circuit) and the output current (the current drive signal). When the current control unit 1511 current controls the voltage source, it is based on the initial current on the data line SL. A current signal is respectively output to the data line SL to drive the light-emitting diode 13 to emit light. The voltage-controlled current source has a fixed input voltage (has a fixed functional relationship with the current drive signal) and an output current (the current drive signal) as a function. According to the initial current on the data line SL, a function is determined Pair with initial current According to the input voltage, a current signal is output to each data line SL to drive the light-emitting diode 13 to emit light according to the input voltage.

請參閱圖4，於另一實施例中，電流控制單元1511也可為一可變電阻Ld，藉由阻值的改變以改變輸出電流(所述電流驅動訊號)。 Referring to FIG. 4, in another embodiment, the current control unit 1511 can also be a variable resistor L d , which changes the output current (the current drive signal) by changing the resistance.

請再參閱圖1，本實施例提供的顯示面板10包括分別發紅光、綠光、藍光三種顏色光的發光二極體13，發紅光、綠光、藍光三種顏色光的發光二極體13在顯示基板11上的排布方式如圖5所示(為了方便觀看，圖5中省略了部分結構)，位於同一行的子畫素12中，相鄰排布的三個子畫素12作為一顯示畫素，該相鄰排列的三個子畫素12中設置的發光二極體分別發射紅光(R)、綠光(G)及藍光(B)。每一行子畫素12中包括複數上述的顯示畫素。 Please refer to FIG. 1 again, the display panel 10 provided in this embodiment includes light-emitting diodes 13 that emit red light, green light, and blue light, respectively, and light-emitting diodes that emit red light, green light, and blue light. The arrangement of 13 on the display substrate 11 is shown in Figure 5 (for the convenience of viewing, part of the structure is omitted in Figure 5). Among the sub-pixels 12 in the same row, three adjacently arranged sub-pixels 12 serve as One display pixel, the light-emitting diodes arranged in the three adjacent sub-pixels 12 respectively emit red light (R), green light (G) and blue light (B). Each row of sub-pixels 12 includes a plurality of the above-mentioned display pixels.

請參閱圖6，圖6中橫坐標軸表示時間，縱坐標軸表示閘極線GL1至GLm上的驅動訊號(電壓訊號)。本實施例中，顯示面板10工作於複數顯示幀，顯示面板10在每一顯示幀中的工作過程基本相同，顯示幀的刷新頻率為60赫茲，則每一顯示幀持續16.67毫秒。以顯示幀frame(n)為例，驅動器15輸出至閘極線GL的驅動訊號為低電平時，閘極線GL所電連接的發光二極體處於工作狀態(on)，驅動器15輸出至閘極線GL的驅動訊號為高電平時，閘極線GL所電連接的發光二極體處於非工作狀態(off)。驅動器15以從閘極線GL1至GLm的順序依次輸出低電平的驅動訊號VGL(包括VGL1至VGLm)至各條閘極線GL1至GLm，則各條閘極線GL1至GLm所電連接的發光二極體13依次處於工作狀態，處於工作狀態的發光二極體13的發光輝度由其所電連接的資料線SL上的電流控制。本實施例中，同一時刻，僅一條閘極線GL所電連接的各個發光二極體13處於工作狀態(on)，其餘閘極線所電連接的各個發光二極體13則處於非工作狀態(off)；也即，同一時刻，每條資料線SL上僅一個發光二極體13處於工作狀態(on)，其餘各個發光二極體13則處於非工作狀態(off)。 Please refer to FIG. 6. In FIG. 6, the abscissa axis represents time, and the ordinate axis represents driving signals (voltage signals) on the gate lines GL1 to GLm. In this embodiment, the display panel 10 works in a plurality of display frames. The working process of the display panel 10 in each display frame is basically the same. The refresh rate of the display frame is 60 Hz, and each display frame lasts 16.67 milliseconds. Taking the display frame (n) as an example, when the driving signal output by the driver 15 to the gate line GL is low, the light-emitting diode electrically connected to the gate line GL is in the working state (on), and the driver 15 outputs to the gate When the driving signal of the gate line GL is at a high level, the light-emitting diode electrically connected to the gate line GL is in an off state (off). The driver 15 sequentially outputs low-level driving signals V GL (including V GL1 to V GLm ) to the respective gate lines GL1 to GLm in order from the gate lines GL1 to GLm, and the respective gate lines GL1 to GLm are The electrically connected light-emitting diodes 13 are sequentially in the working state, and the luminous brightness of the light-emitting diodes 13 in the working state is controlled by the current on the data line SL to which they are electrically connected. In this embodiment, at the same time, each light-emitting diode 13 electrically connected to only one gate line GL is in an operating state (on), and each light-emitting diode 13 electrically connected to the remaining gate lines is in a non-operating state (off); That is, at the same time, only one light-emitting diode 13 on each data line SL is in a working state (on), and the remaining light-emitting diodes 13 are in a non-working state (off).

請參閱圖7，橫坐標標表示電壓，縱坐標表示電流。根據發光二極體“正嚮導通反向截止”的特性，處於工作狀態的發光二極體13的正極電壓高於 負極電壓，且正負極之間的電壓差大於發光二極體13的啟動電壓Vk，發光二極體13的發光輝度與發光二極體13內的電流呈正比。處於非工作狀態的發光二極體13的負極電壓高於正極電壓，且正負極之間的電壓差小於發光二極體13的崩潰電壓Vbr，則發光二極體13處於非工作狀態時，具有一反偏電流，該反偏電流極小，接近於零。且發光二極體13正負極之間的電壓差小於發光二極體13的崩潰電壓Vbr時，反偏電流的大小幾乎不隨電壓差的變化而發生變化。本實施例中，每條資料線SL所電連接的各個發光二極體13在處於非工作狀態時的反偏電流大小相等(反偏電流的大小主要取決於發光二極體本身的結構特性)。 Please refer to Figure 7. The abscissa indicates voltage and the ordinate indicates current. According to the characteristics of the "forward conduction and reverse cutoff" of the light-emitting diode, the positive electrode voltage of the light-emitting diode 13 in the working state is higher than the negative electrode voltage, and the voltage difference between the positive and negative electrodes is greater than the starting voltage of the light-emitting diode 13 V k , the luminous brightness of the light-emitting diode 13 is proportional to the current in the light-emitting diode 13. The negative electrode voltage of the non-working light-emitting diode 13 is higher than the positive electrode voltage, and the voltage difference between the positive and negative electrodes is less than the breakdown voltage V br of the light-emitting diode 13, then when the light-emitting diode 13 is in the non-working state, With a reverse bias current, the reverse bias current is extremely small, close to zero. And when the voltage difference between the positive and negative electrodes of the light-emitting diode 13 is less than the breakdown voltage Vbr of the light-emitting diode 13, the magnitude of the reverse bias current hardly changes with the change of the voltage difference. In this embodiment, the reverse bias currents of the light emitting diodes 13 electrically connected to each data line SL are the same when they are in a non-working state (the magnitude of the reverse bias current mainly depends on the structural characteristics of the light emitting diode itself) .

本實施例中，由於同一時刻僅一條閘極線GL所電連接的各個發光二極體13處於工作狀態，其餘閘極線GL所電連接的各個發光二極體13皆處於非工作狀態，則對於每條資料線SL來說，每條資料線所電連接的複數發光二極體13中，僅有一個發光二極體13處於工作狀態，其餘的發光二極體13皆處於非工作狀態。處於非工作狀態的各個發光二極體13皆具有一反偏電壓，雖然反偏電壓極小，接近於零，但是在顯示面板10中往往具有較大數量(上千、上萬)的發光二極體，因此，處於非工作狀態的各個發光二極體13的反偏電流疊加之後使得各條資料線SL上的反偏電流總和較大。本實施例中，將處於非工作狀態的各個發光二極體13產生的反偏電流用作驅動處於工作狀態的各個發光二極體13的驅動電流。以下詳細闡述： In this embodiment, since each light-emitting diode 13 electrically connected to only one gate line GL is in an operating state at the same time, and each light-emitting diode 13 electrically connected to the remaining gate lines GL is in a non-operating state, then For each data line SL, among the plurality of light-emitting diodes 13 electrically connected to each data line, only one light-emitting diode 13 is in the working state, and the remaining light-emitting diodes 13 are in the non-working state. Each light emitting diode 13 in a non-working state has a reverse bias voltage. Although the reverse bias voltage is extremely small and close to zero, there are often a large number (thousands, tens of thousands) of light-emitting diodes in the display panel 10 Therefore, after the reverse bias current of each light emitting diode 13 in the non-operating state is superimposed, the sum of the reverse bias current on each data line SL is larger. In this embodiment, the reverse bias current generated by each light emitting diode 13 in the non-working state is used as the driving current for driving each light emitting diode 13 in the working state. The following elaborates:

請參閱圖8，本實施例還提供一種驅動方法，應用於上述的顯示面板10中，包括如下步驟：步驟S1，獲取當前處於工作狀態的發光二極體的目標驅動電流；步驟S2，獲取各條資料線上的初始電流；步驟S3，根據目標驅動電流及初始電流，輸出驅動訊號至各條資料線。 Referring to FIG. 8, this embodiment also provides a driving method, which is applied to the above-mentioned display panel 10, and includes the following steps: step S1, obtain the target driving current of the light-emitting diode currently in working state; step S2, obtain each The initial current on each data line; step S3, according to the target drive current and the initial current, output a drive signal to each data line.

本實施例提供的顯示面板10中，各列子畫素12中的各個發光二極體13的工作模式是相似的，為了表述方便，以下將以其中一列子畫素12中的各 個發光二極體13的工作過程、以及與該列子畫素12相關的閘極線GL及資料線SL上的訊號傳輸作示例性說明。 In the display panel 10 provided in this embodiment, the working modes of each light-emitting diode 13 in each column of sub-pixels 12 are similar. For ease of presentation, the following will use each column of sub-pixels 12 as The working process of each light emitting diode 13 and the signal transmission on the gate line GL and the data line SL related to the row of sub-pixels 12 are exemplified.

請參閱圖9，資料線SL1與閘極線GL1至GLm絕緣交叉，本實施例中，資料線SL1與閘極線GL1至GLm垂直交叉，資料線SL1與閘極線GL1至GLm-1定義的複數子畫素12中分別設置有一發光二極體13，資料線SL1與閘極線GLm定義的部分子畫素12中，設置有一電流源14。當前時刻，發光二極體13(資料線SL1與閘極線GL1定義的子畫素12中的發光二極體13)處於工作狀態，其餘發光二極體13(資料線SL1與閘極線GL2至GLm-1定義的各個子畫素12中的發光二極體13)處於非工作狀態。處於非工作狀態的各個發光二極體13反向截止，分別具有一反偏電流ir，本實施例中，各個發光二極體13的反偏電流ir幅值相等，方向相同。 Referring to FIG. 9, the data line SL1 is insulated and crossed with the gate lines GL1 to GLm. In this embodiment, the data line SL1 crosses the gate lines GL1 to GLm perpendicularly, and the data line SL1 is defined by the gate lines GL1 to GLm-1. A light emitting diode 13 is respectively arranged in the plurality of sub-pixels 12, and a current source 14 is arranged in the part of the sub-pixels 12 defined by the data line SL1 and the gate line GLm. At this moment, the light-emitting diode 13 (the light-emitting diode 13 in the sub-pixel 12 defined by the data line SL1 and the gate line GL1) is in working state, and the remaining light-emitting diodes 13 (the data line SL1 and the gate line GL2) are in working state. The light-emitting diodes 13) in each sub-pixel 12 defined by GLm-1 are in a non-working state. Non-operation state of each of the light emitting diode 13 reverse-blocking, each having a reverse bias current i r, in the present embodiment, each light-emitting diode 13 is equal to the reverse bias current magnitude i r, in the same direction.

請一併參閱圖8及圖9，步驟S1中，獲取當前處於工作狀態的發光二極體13的目標驅動電流iR。本實施例中，獲取當前處於工作狀態的發光二極體13的目標驅動電流iR的步驟具體包括：根據預存的顯示資料計算當前處於工作狀態的發光二極體13的目標發光輝度，根據目標發光輝度計算所需的目標驅動電流iR。處於工作狀態的發光二極體13的發光輝度由顯示資料決定，該顯示資料預存於驅動器15，在顯示面板10工作時，驅動器15將該預存的顯示資料寫入資料線SL1中，從而驅動資料線SL1所電連接的發光二極體13發光。不同的顯示資料體現為發光二極體13的不同發光輝度，而發光二極體13的發光輝度由驅動該發光二極體13發光的電流決定，將當前根據顯示資料確定的發光二極體13的發光輝度定義為目標發光輝度，並將驅動發光二極體13達到目標發光輝度的電流定義為目標驅動電流iR，則根據發光二極體13發光輝度與驅動電流iR的函數關係(由發光二極體13本身的結構特性決定)，便可由目標發光輝度計算得到目標驅動電流iR。 Please refer to FIG. 8 and FIG. 9 together. In step S1, the target driving current i R of the light emitting diode 13 currently in the working state is obtained. In this embodiment, the step of obtaining the target driving current i R of the light-emitting diode 13 currently in working state specifically includes: calculating the target luminous brightness of the light-emitting diode 13 currently in working state according to the pre-stored display data, and according to the target The target drive current i R required for luminous intensity calculation. The luminous intensity of the light-emitting diode 13 in the working state is determined by the display data, which is pre-stored in the driver 15. When the display panel 10 is working, the driver 15 writes the pre-stored display data into the data line SL1 to drive the data The light emitting diode 13 electrically connected to the line SL1 emits light. Different display data is reflected in the different luminous brightness of the light-emitting diode 13, and the luminous brightness of the light-emitting diode 13 is determined by the current driving the light-emitting diode 13 to emit light, and the current light-emitting diode 13 determined according to the display data is determined. The luminous brightness of is defined as the target luminous brightness, and the current that drives the light-emitting diode 13 to reach the target luminous brightness is defined as the target driving current i R , then according to the functional relationship between the luminous brightness of the light-emitting diode 13 and the driving current i R (by The structural characteristics of the light-emitting diode 13 itself are determined), and the target driving current i R can be calculated from the target luminous brightness.

請繼續一併參閱圖8及圖9，步驟S2中，獲取資料線SL1上的初始電流iSL1。初始電流iSL1為資料線SL1所電連接的當前處於非工作狀態的各個 發光二極體13的反偏電流ir與資料線SL1所電連接的電流源14的輸出電流ip疊加後的電流之和。根據圖9所示的各個發光二極體13、電流源14與資料線SL1的連接方式可知，各個發光二極體13與電流源14是並聯的關係，因此各個發光二極體13與電流源14的電流會疊加至資料線SL1上，作為資料線SL1的初始電流iSL1，該初始電流iSL1流入此時處於工作狀態的發光二極體13用於驅動其發光。 Please continue to refer to FIGS. 8 and 9 together. In step S2, the initial current i SL1 on the data line SL1 is obtained. The initial current i SL1 is the current obtained by superimposing the reverse bias current i r of each light emitting diode 13 that is currently in a non-operating state electrically connected to the data line SL1 and the output current i p of the current source 14 electrically connected to the data line SL1 Sum. According to the connection mode of each light-emitting diode 13, current source 14 and data line SL1 shown in FIG. 9, each light-emitting diode 13 and current source 14 are connected in parallel, so each light-emitting diode 13 and current source The current of 14 is superimposed on the data line SL1 as the initial current i SL1 of the data line SL1, and the initial current i SL1 flows into the light emitting diode 13 in the working state at this time to drive it to emit light.

其中，電流源14在被開啟時的輸出電流ip是根據電流源本身的結構確定，為一恒定的電流值，不隨著驅動器15輸出的訊號的變化而發生變化。電流源14開啟時，輸出電流為ip，且電流方向與處於非工作狀態的發光二極體13的反偏電流ir相同；當電流源14關閉時，輸出電流ip為0。而各個處於非工作狀態的發光二極體的反偏電流ir不易直接測得，本實施例中，各個處於非工作狀態的發光二極體的反偏電流ir藉由如下方式獲取：控制所有發光二極體13處於非工作狀態，並關閉電流源14，以偵測資料線SL1上的反偏電流總和Ir；根據資料線SL1上的反偏電流總和Ir及資料線SL1所電連接的發光二極體13的數量，計算資料線SL1所電連接的發光二極體13處於非工作狀態時的反偏電流ir。 The output current i p of the current source 14 when it is turned on is determined according to the structure of the current source itself, and is a constant current value, which does not change with the change of the signal output by the driver 15. When the current source 14 is turned on, the output current is i p , and the current direction is the same as the reverse bias current i r of the light emitting diode 13 in the non-working state; when the current source 14 is turned off, the output current i p is zero. I r and the reverse bias current of each light emitting diode in the non-operation state is not easily measured directly, according to the present embodiment, the reverse bias current i r each light-emitting diode in the non-operating state by acquiring a manner that: Control All the light emitting diode 13 is in non-operating state, current sources 14 and close to the sum of the reverse bias current I r on the detected data line SL1; SL1 the sum of the electric current I r reverse bias and data lines on the data line SL1 The number of connected light-emitting diodes 13 is calculated, and the reverse bias current i r when the light-emitting diode 13 electrically connected to the data line SL1 is in a non-working state is calculated.

由於電流源14被關閉，則資料線SL1上的反偏電流總和Ir為所有發光二極體13的反偏電流ir疊加後的值，且每個發光二極體13的反偏電流ir相等，資料線SL1所電連接的發光二極體13的數量已知，因此步驟S4中可根據反偏電流總和Ir及發光二極體數量計算出反偏電流：ir=Ir/(m-1)。 Since the current source 14 is turned off, the reverse bias current I r on the sum of the data line SL1 values for all LED's reverse bias current i r 13 superimposed polar body, and the reverse bias current of each light emitting diode in i 13 r is equal, and the number of light-emitting diodes 13 electrically connected to the data line SL1 is known. Therefore, in step S4, the reverse bias current can be calculated according to the sum of the reverse bias current Ir and the number of light-emitting diodes: i r =I r / (m-1).

則本實施例中，步驟S2具體為：疊加資料線SL1所電連接的當前處於非工作狀態的發光二極體13的反偏電流ir及資料線SL1所電連接的電流源14的輸出電流ip，以獲取資料線SL1的初始電流iSL1：iSL1=(m-2)ir+ip。 In this embodiment, step S2 is specifically: superimposing the reverse bias current i r of the light emitting diode 13 electrically connected to the data line SL1 and currently in the non-operating state and the output current of the current source 14 electrically connected to the data line SL1 i p to obtain the initial current i SL1 of the data line SL1: i SL1 = (m-2) i r + i p .

資料線SL1上的初始電流iSL1為當前時刻處於非工作狀態的各個發光二極體13所產生的反偏電流ir與電流源14的輸出電流ip的疊加及，用於驅動 處於工作狀態的發光二極體13發光。但由於處於非工作狀態的發光二極體13的反偏電流ir幾乎不變，電流源14的輸出電流ip也恒定不變，而處於工作狀態的發光二極體13要達到目標發光輝度所需的目標驅動電流iR是隨著顯示資料不同而發生變化的，因此不能使得資料線SL1上的初始電流iSL1始終滿足處於工作狀態的發光二極體13的發光需求。因此本實施例中，藉由驅動器15輸出驅動訊號至資料線SL1，補償初始電流iSL1與目標驅動電流iR之間的電流差值。因此本實施例中，步驟S3具體包括：根據資料線SL1所電連接的處於工作狀態的發光二極體13的目標驅動電流iR及資料線SL1的初始電流iSL1之間的電流差值，輸出驅動訊號至資料線SL1。本實施例中，驅動器15輸出的驅動訊號為電流驅動訊號I0。且電流驅動訊號與電流差值的幅值相等，方向相反，也即：I0=-(iSL1-iR)，iSL1=(m-2)ir+ip。 The initial emission current I SL1 each data line SL1 in the non-operating state of the current time is superimposed diode reverse bias current i r generated by the current source 13 output current i p 14 and, in the operating state for driving The light-emitting diode 13 emits light. However, since the reverse bias current i r of the light-emitting diode 13 in the non-working state is almost unchanged, the output current i p of the current source 14 is also constant, and the light-emitting diode 13 in the working state must achieve the target luminous brightness. The required target driving current i R varies with different display materials, so the initial current i SL1 on the data line SL1 cannot always meet the light-emitting requirements of the light-emitting diode 13 in the working state. Therefore, in this embodiment, the driver 15 outputs the driving signal to the data line SL1 to compensate the current difference between the initial current i SL1 and the target driving current i R. Therefore, in this embodiment, step S3 specifically includes: according to the current difference between the target drive current i R of the light emitting diode 13 in the working state electrically connected to the data line SL1 and the initial current i SL1 of the data line SL1, Output the driving signal to the data line SL1. In this embodiment, the driving signal output by the driver 15 is the current driving signal I 0 . And the amplitude of the current drive signal and the current difference are equal, but the direction is opposite, that is, I 0 =-(i SL1 -i R ), i SL1 =(m-2)i r +i p .

請參閱圖10，圖10以發光二極體13相關的訊號時序進行舉例說明，其中(a)、(b)、(c)、(d)中的橫坐標表示時間，(a)、(b)、(c)中的縱坐標表示電流值，(d)中的縱坐標表示電壓值。請一併參閱圖9至圖10，在時段I，閘極線GL1至GLm-1上的電壓VGL大於資料線SL1上的電壓VSL，所有發光二極體13反向截止，處於非工作狀態，每個發光二極體13具有一反偏電流ir，且電流源14保持啟動狀態，資料線SL1上的初始電流的值iSL1=(m-1)ir+ip。在時段Ⅱ，閘極線GL1上的電壓VGL小於資料線SL1上的電壓VSL，而閘極線GL2至GLm-1上的電壓大於資料線SL1上的電壓，則發光二極體13正嚮導通，處於工作狀態，其餘發光二極體13反向截止，處於非工作狀態，處於工作狀態的發光二極體13具有一目標驅動電流iR，處於非工作狀態的每一發光二極體13具有一反偏電流ir，且電流源14保持啟動狀態，資料線SL1上的初始電流的值iSL1=(m-2)ir+ip，由於反偏電流ir的值極小，接近於零，因此(m-2)ir+ip

Figure 108147716-A0305-02-0012-4
(m-1)ir+ip，也即，初始電流iSL1的值在時段I及時段Ⅱ基本相等(圖10中為了方便區別不同的訊號，各個訊號的幅值僅為示意性呈現)。 Please refer to Figure 10. Figure 10 illustrates the signal timing related to the light-emitting diode 13 as an example, where the abscissas in (a), (b), (c), (d) represent time, and (a), (b) The ordinate in) and (c) represents the current value, and the ordinate in (d) represents the voltage value. Please refer to FIGS. 9 to 10 together. In the period I, the voltage V GL on the gate lines GL1 to GLm-1 is greater than the voltage V SL on the data line SL1, and all the light-emitting diodes 13 are reversely cut off and are not in operation. In the state, each light emitting diode 13 has a reverse bias current i r , and the current source 14 remains in the activated state, the value of the initial current on the data line SL1 is i SL1 =(m-1)i r +i p . In period II, the voltage V GL on the gate line GL1 is less than the voltage V SL on the data line SL1, and the voltage on the gate lines GL2 to GLm-1 is greater than the voltage on the data line SL1, the light emitting diode 13 is positive Conduction, in the working state, the other light-emitting diodes 13 are reversely cut off and are in a non-working state. The light-emitting diodes 13 in the working state have a target driving current i R , and each light-emitting diode in the non-working state 13 has a reverse bias current i r , and the current source 14 remains activated. The value of the initial current on the data line SL1 is i SL1 = (m-2) i r + i p . Since the value of the reverse bias current i r is extremely small, Close to zero, so (m-2)i r +i p
Figure 108147716-A0305-02-0012-4
(m-1) i r + i p , that is, the value of the initial current i SL1 is basically the same in period I and period II (in Figure 10 for the convenience of distinguishing different signals, the amplitude of each signal is only shown schematically) .

請繼續參閱圖10，如上述的，在時段Ⅱ，發光二極體13處於工作狀態，圖10中(a)表示發光二極體13處於工作狀態時，資料線SL1上的初始電流iSL1小於發光二極體13的目標驅動電流iR的情況，圖10中(b)表示發光二極體13處於工作狀態時，資料線SL1上的初始電流iSL1等於發光二極體13的目標驅動電流iR的情況，圖10中(c)表示發光二極體13處於工作狀態時，資料線SL1上的初始電流iSL1大於發光二極體13的目標驅動電流iR的情況，而圖10中(d)表示資料線SL1及閘極線GL1上的電壓波形變化。如圖10中(a)、(b)、(c)所示的初始電流iSL1與目標驅動電流iR之間三種大小關係的情況下，電流源14始終保持開啟。 Please continue to refer to FIG. 10, as mentioned above, in the period II, the light-emitting diode 13 is in the working state. In FIG. 10 (a) shows that when the light-emitting diode 13 is in the working state, the initial current i SL1 on the data line SL1 is less than In the case of the target drive current i R of the light-emitting diode 13, (b) in FIG. 10 shows that when the light-emitting diode 13 is in the working state, the initial current i SL1 on the data line SL1 is equal to the target drive current of the light-emitting diode 13 In the case of i R , Fig. 10(c) shows that when the light-emitting diode 13 is in the working state, the initial current i SL1 on the data line SL1 is greater than the target driving current i R of the light-emitting diode 13, while in Fig. 10 (d) shows the voltage waveform changes on the data line SL1 and the gate line GL1. In the case of three magnitude relationships between the initial current i SL1 and the target drive current i R as shown in (a), (b), and (c) in FIG. 10, the current source 14 is always turned on.

如上述的方法步驟，即可實現將處於非工作狀態的發光二極體13上產生的反偏電流ir用作驅動處於工作狀態的發光二極體13的驅動電流iR，一方面，利用上述反偏電流ir，減少了驅動器15的電流輸出；另一方面，將該反偏電流ir用作發光二極體13的驅動電流iR，有利於改善反偏電流ir對當前處於工作狀態的發光二極體13產生影響，從而影響畫面顯示質量，降低對比度的問題。 The above method steps can be realized in the non-operating state of the light emitting diode emitting reverse bias current i r generated by the drive 13 as in the operating state of the drive current i R 13 two polar bodies, on the one hand, using The above reverse bias current i r reduces the current output of the driver 15; on the other hand, using the reverse bias current i r as the driving current i R of the light-emitting diode 13 is beneficial to improve the effect of the reverse bias current i r on the current The light-emitting diode 13 in the working state has an impact, thereby affecting the display quality of the picture and reducing the problem of contrast.

如上述的，每一列的各個子畫素12中的發光二極體13的作動步驟基本相同，但是，各列子畫素12中的發光二極體13在工作過程中涉及到的訊號的(例如目標驅動電流iR、反偏電流ir等)具體數值可不同。 As mentioned above, the action steps of the light-emitting diode 13 in each sub-pixel 12 of each column are basically the same. However, the light-emitting diode 13 in each sub-pixel 12 of each column is related to the signal (for example, The specific values of target drive current i R , reverse bias current i r, etc.) can be different.

例如，資料線SL1與閘極線GL1定義的子畫素12中的發光二極體13用於發射紅光，資料線SL2與閘極線GL1定義的子畫素12中的發光二極體13用於發射綠光，資料線SL3與閘極線GL1定義的子畫素12中的發光二極體13用於發射藍光，由於發射不同顏色光的發光二極體13的內部結構是不同的，會導致其電性能的差異。例如參閱圖11，曲線BR標識發射紅色光的發光二極體13的發光輝度與其驅動電流之間的函數關係，曲線BG標識發射綠色光的發光二極體13的發光輝度與其驅動電流之間的函數關係，曲線BB標識發射藍色光的發光二極體13的發光輝度與其驅動電流之間的函數關係。可見發射不同顏色光 的發光二極體13的發光輝度與其驅動電流之間的函數關係是不一樣的，但是整體趨勢都是發光輝度與驅動電流呈正比。 For example, the light-emitting diode 13 in the sub-pixel 12 defined by the data line SL1 and the gate line GL1 is used to emit red light, and the light-emitting diode 13 in the sub-pixel 12 defined by the data line SL2 and the gate line GL1 For emitting green light, the light-emitting diode 13 in the sub-pixel 12 defined by the data line SL3 and the gate line GL1 is used to emit blue light. Since the internal structure of the light-emitting diode 13 that emits light of different colors is different, Will lead to differences in its electrical properties. For example, referring to FIG. 11, the curve B R indicates the function relationship between the luminescence brightness of the light emitting diode 13 emitting red light and its driving current, and the curve B G indicates the relationship between the luminescence brightness of the light emitting diode 13 emitting green light and its driving current. function of the relationship between the light emitting curve B B identifies diode emitting blue light and its functional relationship between the driving current 13 of the emission luminance thereof. It can be seen that the functional relationship between the luminous brightness of the light-emitting diodes 13 emitting different colors of light and the driving current is different, but the overall trend is that the luminous brightness is proportional to the driving current.

綜上，本實施例提供的顯示面板10及驅動方法，有利於節省驅動器15的輸出電流並有利於改善顯示效果、提高畫面對比度。 In summary, the display panel 10 and the driving method provided in this embodiment are beneficial to save the output current of the driver 15 and are beneficial to improve the display effect and the contrast of the picture.

實施例二 Example two

本實施例提供的顯示面板，與實施例一中的顯示面板10結構基本相同，不再贅述。請參閱圖12，本實施例提供的驅動方法，與實施例一的主要區別在於，在步驟S3之前，還包括：步驟S4，判斷資料線SL1所電連接的處於非工作狀態的發光二極體13的反偏電流ir之和是否小於資料線SL1所電連接的處於工作狀態的發光二極體13的目標驅動電流iR；若判斷為是，則執行步驟S5，控制電流源14開啟；若判斷為否，則執行步驟S6，控制電流源14關閉。 The structure of the display panel provided in this embodiment is basically the same as that of the display panel 10 in the first embodiment, and will not be repeated here. Referring to FIG. 12, the main difference between the driving method provided in this embodiment and the first embodiment is that before step S3, it further includes: step S4, determining the non-working light-emitting diode electrically connected to the data line SL1 Whether the sum of the reverse bias current i r of 13 is less than the target drive current i R of the light emitting diode 13 in the working state electrically connected to the data line SL1; if the judgment is yes, step S5 is executed to control the current source 14 to turn on; If the judgment is no, step S6 is executed to control the current source 14 to be turned off.

本實施例中，電流源14並非在顯示面板10的工作過程中持續保持開啟，而根據處於非工作狀態的發光二極體13的反偏電流ir之和與目標驅動電流iR的大小關係確定是否開啟。 In this embodiment, the current source 14 is not continuously turned on during the operation of the display panel 10, but according to the relationship between the sum of the reverse bias current i r of the non-operating light emitting diode 13 and the target driving current i R Determine if it is turned on.

如圖9中所示，電流源14的輸出電流ip與發光二極體13的反偏電流ir方向相同，電流源14的輸出電流ip與各個處於非工作狀態的發光二極體13的反偏電流ir疊加之後共同驅動處於工作狀態的發光二極體13發光，此為考慮各個發光二極體13的反偏電流總和不夠驅動處於工作狀態的發光二極體13時，增設電流源14以符合驅動處於工作狀態的發光二極體13時的驅動電流iR的要求。但，如前述的，處於工作狀態的發光二極體13的目標驅動電流iR是不斷變化的，若各個處於非工作狀態的發光二極體13的反偏電流ir之和已經大於等於目標驅動電流iR，則不必再開啟電流源14；僅在各個發光二極體13的反偏電流ir之和小於目標驅動電流iR時開啟電流源14。 As shown in FIG. 9, the output current i p of the current source 14 is in the same direction as the reverse bias current i r of the light-emitting diode 13, and the output current i p of the current source 14 is the same as that of each light-emitting diode 13 in a non-operating state. After the reverse bias current i r is superimposed, the light emitting diode 13 in the working state is driven together to emit light. This is when considering that the sum of the reverse bias current of each light emitting diode 13 is not enough to drive the light emitting diode 13 in the working state, the current is added The source 14 meets the requirements of the driving current i R when driving the light emitting diode 13 in the working state. However, as mentioned above, the target drive current i R of the light-emitting diode 13 in the working state is constantly changing. If the sum of the reverse bias current i r of the light-emitting diodes 13 in the non-working state is already greater than or equal to the target The driving current i R does not need to turn on the current source 14 any more; the current source 14 is only turned on when the sum of the reverse bias current i r of each light-emitting diode 13 is less than the target driving current i R.

請參閱圖13，圖13以發光二極體13相關的訊號時序進行舉例說明，其中(a)、(b)、(c)、(d)中的橫坐標表示時間，(a)、(b)、(c)中的縱坐標表示電流值，(d)中的縱坐標表示電壓值。請一併參閱圖9與圖13，在時段I，閘極線GL1至GLm-1上的電壓大於資料線SL1上的電壓，所有發光二極體13反向截止，處於非工作狀態，每個發光二極體13具有一反偏電流ir，在時段Ⅱ，閘極線GL1上的電壓小於資料線SL1上的電壓，而閘極線GL2至GLm-1上的電壓大於資料線SL1上的電壓，則發光二極體13正嚮導通，處於工作狀態，其餘發光二極體13反向截止，處於非工作狀態，處於工作狀態的發光二極體13具有一目標驅動電流iR，處於非工作狀態的每一發光二極體13具有一反偏電流ir。 Please refer to Figure 13. Figure 13 illustrates the signal timing related to the light-emitting diode 13 as an example. The abscissas in (a), (b), (c), (d) represent time, and (a), (b) The ordinate in) and (c) represents the current value, and the ordinate in (d) represents the voltage value. Please refer to FIGS. 9 and 13 together. In period I, the voltage on the gate lines GL1 to GLm-1 is greater than the voltage on the data line SL1, and all the light-emitting diodes 13 are reversely cut off and are in a non-operating state. The light emitting diode 13 has a reverse bias current i r . In the period II, the voltage on the gate line GL1 is less than the voltage on the data line SL1, and the voltage on the gate lines GL2 to GLm-1 is greater than that on the data line SL1. Voltage, the light-emitting diode 13 is in forward conduction and is in the working state, and the other light-emitting diodes 13 are reversely cut off and are in a non-working state. The light-emitting diode 13 in the working state has a target drive current i R and is in a non-working state. Each light emitting diode 13 in the working state has a reverse bias current i r .

請繼續參閱圖13，在時段Ⅱ，若步驟S4中判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和已經大於目標驅動電流iR，則控制關閉電流源14，資料線SL1上的初始電流的值iSL1=(m-2)ir，如圖13中(a)所示。若步驟S4中判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和已經等於目標驅動電流iR，也控制關閉電流源14，資料線SL1上的初始電流的值iSL1=(m-2)ir，如圖13中(b)所示。而步驟S4中判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和小於目標驅動電流iR時，開啟電流源14，資料線SL1上的初始電流的值iSL1=(m-2)ir+ip，如圖13中(c)所示。由圖13可知，在時段I及時段Ⅱ，電流源14僅在步驟S4中判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和小於目標驅動電流iR時開啟。 Please continue to refer to FIG. 13. In the period II, if it is determined in step S4 that the sum of the reverse bias current i r of the non-operating light-emitting diodes 13 is greater than the target drive current i R , the current source 14 is controlled to be turned off. The value of the initial current on the line SL1 i SL1 = (m-2) i r , as shown in Figure 13 (a). If it is determined in step S4 that the sum of the reverse bias current i r of the non-operating light-emitting diodes 13 is equal to the target drive current i R , the current source 14 is also controlled to turn off, and the value of the initial current i SL1 on the data line SL1 =(m-2)i r , as shown in Figure 13(b). When it is judged in step S4 that the sum of the reverse bias current i r of the non-operating light-emitting diodes 13 is less than the target driving current i R , the current source 14 is turned on, and the value of the initial current i SL1 on the data line SL1 =( m-2) i r + i p , as shown in Figure 13 (c). It can be seen from FIG. 13 that in the period I and the period II, the current source 14 is turned on only when it is determined in step S4 that the sum of the reverse bias current i r of the non-operating light-emitting diodes 13 is less than the target driving current i R.

如上述的，在步驟S4中，先藉由判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和與目標驅動電流iR之間的大小關係確定是否需要開啟電流源14，僅在判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和大於等於目標驅動電流iR時開啟電流源14而在判斷各個處於非工作狀態的發光二極體13的反偏電流ir之和小於目標驅動電流iR時關閉電流源14，相較於實施例一中的驅動方法，有利於節省顯示面板10的電能。 As mentioned above, in step S4, first determine whether the current source 14 needs to be turned on by determining the magnitude relationship between the sum of the reverse bias current i r of each non-operating light-emitting diode 13 and the target drive current i R , Only when it is judged that the sum of the reverse bias current i r of each non-operating light-emitting diode 13 is greater than or equal to the target drive current i R , the current source 14 is turned on, and when it is judged that each light-emitting diode 13 is in the non-operating state, When the sum of the reverse bias current i r is less than the target driving current i R , the current source 14 is turned off. Compared with the driving method in the first embodiment, it is beneficial to save the power of the display panel 10.

進一步的，上述的顯示面板10，發光二極體13與閘極線GL及資料線SL的電連接方式皆可變更。具體的，上述的發光二極體13為正極電連接一資料線SL，負極電連接一閘極線GL；請參閱圖14，在本發明的一變更實施例中，發光二極體13也可為正極電連接一閘極線GL，負極電連接一資料線SL。 Furthermore, in the above-mentioned display panel 10, the electrical connection of the light-emitting diode 13 with the gate line GL and the data line SL can be changed. Specifically, the above-mentioned light-emitting diode 13 has a positive electrode electrically connected to a data line SL, and a negative electrode electrically connected to a gate line GL; please refer to FIG. 14, in a modified embodiment of the present invention, the light emitting diode 13 may also be A gate line GL is electrically connected to the positive pole, and a data line SL is electrically connected to the negative pole.

發光二極體13正極電連接閘極線GL，負極電連接資料線SL時，閘極線GL及資料線SL上的訊號輸出方式與上述實施例一至實施例二中所述的訊號輸出方式剛好相反。也即，對於每一發光二極體13，其所電連接的閘極線GL上的電壓大於其所電連接的資料線SL上的電壓，且閘極線GL與資料線SL上的電壓差大於發光二極體13的閾值電壓時，發光二極體13處於工作狀態；當其所電連接的閘極線GL上的電壓大於其所電連接的資料線SL上的電壓，但閘極線GL與資料線SL上的電壓差小於發光二極體13的閾值電壓、或其所電連接的閘極線GL上的電壓小於其所電連接的資料線SL上的電壓時，發光二極體13處於非工作狀態。 When the positive electrode of the light-emitting diode 13 is electrically connected to the gate line GL and the negative electrode is electrically connected to the data line SL, the signal output method on the gate line GL and the data line SL is exactly the same as the signal output method described in the first to second embodiments above in contrast. That is, for each light emitting diode 13, the voltage on the gate line GL electrically connected to it is greater than the voltage on the data line SL to which it is electrically connected, and the voltage difference between the gate line GL and the data line SL is When it is greater than the threshold voltage of the light-emitting diode 13, the light-emitting diode 13 is in the working state; when the voltage on the gate line GL connected to it is greater than the voltage on the data line SL to which it is electrically connected, but the gate line When the voltage difference between GL and the data line SL is less than the threshold voltage of the light-emitting diode 13, or the voltage on the gate line GL electrically connected to it is less than the voltage on the data line SL to which it is electrically connected, the light-emitting diode 13 is in a non-working state.

如上述的顯示面板，也在本發明的保護之列。 The above-mentioned display panel is also protected by the present invention.

本技術領域之普通技術人員應當認識到，以上之實施方式僅是用來說明本發明，而並非用作為對本發明之限定，只要於本發明之實質精神範圍之內，對以上實施例所作之適當改變及變化均落於本發明要求保護之範圍之內。 Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, and not to limit the present invention. As long as they fall within the essential spirit of the present invention, the above embodiments are appropriately made. Changes and changes fall within the scope of protection of the present invention.

10:顯示面板 10: Display panel

11:基板 11: substrate

12:子畫素 12: Sub-pixel

13:發光二極體 13: Light-emitting diode

14:電流源 14: current source

15:驅動器 15: drive

GL、GL1、GL2、GLm:閘極線 GL, GL1, GL2, GLm: gate line

SL、SL1、SL2、SLn:資料線 SL, SL1, SL2, SLn: data line

Claims (10)

一種顯示面板，其改良在於，包括：m條閘極線，沿第一方向相互間隔排列，其中m>2；n條資料線，沿第二方向相互間隔排列，其中n>2，所述m條閘極線與所述n條資料線絕緣交叉設置，所述m條閘極線與所述n條資料線絕緣交叉定義複數子畫素；複數發光二極體，每一發光二極體形成於一子畫素中，每一發光二極體分別電連接定義發光二極體所在子畫素的一條資料線及一條閘極線，每一發光二極體在處於非工作狀態時，具有一反偏電流；n個電流源，每一電流源具有一輸出電流，每一電流源形成於一子畫素中，每一電流源分別電連接定義電流源所在子畫素的一條資料線及一條閘極線，每個電流源連接不同的資料線；以及驅動器，電連接所述m條閘極線及所述n條資料線，所述驅動器用於控制每個發光二極體及每個電流源的工作狀態，並用於控制所述反偏電流及所述輸出電流驅動當前處於工作狀態的發光二極體發光。 A display panel is improved in that it comprises: m gate lines arranged at intervals in a first direction, where m>2; n data lines arranged at intervals in a second direction, where n>2, the m The gate lines are insulated and crossed with the n data lines, and the m gate lines and the n data lines are insulated and crossed to define a plurality of sub-pixels; a plurality of light-emitting diodes, each light-emitting diode is formed In a sub-pixel, each light-emitting diode is electrically connected to a data line and a gate line that define the sub-pixel where the light-emitting diode is located. Each light-emitting diode has a Reverse bias current; n current sources, each current source has an output current, each current source is formed in a sub-pixel, and each current source is electrically connected to a data line and a data line defining the sub-pixel where the current source is located A gate line, each current source is connected to a different data line; and a driver, which electrically connects the m gate lines and the n data lines, and the driver is used to control each light-emitting diode and each current The working state of the source is used to control the reverse bias current and the output current to drive the light-emitting diode currently in working state to emit light. 如請求項1所述的顯示面板，其中，所述n個電流源連接同一條閘極線。 The display panel according to claim 1, wherein the n current sources are connected to the same gate line. 如請求項1所述的顯示面板，其中，所述n個電流源連接沿第一方向排布的第m條閘極線。 The display panel according to claim 1, wherein the n current sources are connected to the m-th gate line arranged in the first direction. 一種驅動方法，應用於如請求項1至3中任一項所述的顯示面板；其改良在於，所述驅動方法包括如下步驟：獲取當前處於工作狀態的發光二極體的目標驅動電流；獲取各條資料線上的初始電流，每條資料線上的初始電流為資料線所電連接的當前處於非工作狀態的各個發光二極體的反偏電流與資料線所電連接的電流源的輸出電流的疊加及；以及根據目標驅動電流及初始電流，輸出驅動訊號至各條資料線。 A driving method applied to the display panel according to any one of claims 1 to 3; the improvement is that the driving method includes the following steps: obtaining the target driving current of the light-emitting diode currently in operation; obtaining The initial current on each data line. The initial current on each data line is the difference between the reverse bias current of each light-emitting diode that is electrically connected to the data line and the output current of the current source electrically connected to the data line. Superimpose and; and according to the target drive current and the initial current, output the drive signal to each data line. 如請求項4的驅動方法，其中，獲取當前處於工作狀態的發光二極體的目標驅動電流的步驟具體包括：根據預存的顯示資料計算當前處於工作狀態的發光二極體的目標發光輝度，根據目標發光輝度計算所需的目標驅動電流。 For example, the driving method of claim 4, wherein the step of obtaining the target driving current of the light-emitting diode currently in the working state specifically includes: calculating the target luminous brightness of the light-emitting diode currently in the working state according to the pre-stored display data, according to The target driving current required for calculating the target luminous intensity. 如請求項4所述的驅動方法，其中，連接同一條資料線的當前處於非工作狀態的各個發光二極體的反偏電流相等，驅動方法在獲取各條資料線上的初始電流的步驟之前還包括：控制所有發光二極體處於非工作狀態，並關閉所述n個電流源，以分別偵測每條資料線上的反偏電流總和；根據各條資料線上的反偏電流總和及各條資料線所電連接的發光二極體的數量，分別計算各條資料線所電連接的發光二極體處於非工作狀態時的反偏電流；獲取各條資料線上的初始電流的步驟具體包括：分別疊加各條資料線所電連接的當前處於非工作狀態的發光二極體的反偏電流及各條資料線所電連接的電流源的輸出電流，以分別獲取各條資料線的初始電流。 The driving method according to claim 4, wherein the reverse bias currents of the light-emitting diodes connected to the same data line that are currently in a non-operating state are equal, and the driving method is performed before the step of obtaining the initial current on each data line Including: controlling all light-emitting diodes to be in a non-working state, and turning off the n current sources to detect the sum of reverse bias current on each data line respectively; according to the sum of reverse bias current on each data line and each data The number of light-emitting diodes electrically connected to each data line is calculated separately when the light-emitting diode electrically connected to each data line is in a non-working state; the steps of obtaining the initial current on each data line specifically include: respectively Superimpose the reverse bias current of the light-emitting diodes electrically connected to each data line and the output current of the current source electrically connected to each data line to obtain the initial current of each data line. 如請求項4所述的驅動方法，其中，分別根據各條資料線所電連接的處於工作狀態的發光二極體的目標驅動電流及各條資料線的初始電流，輸出驅動訊號至各條資料線的步驟具體包括：分別根據各條資料線所電連接的處於工作狀態的發光二極體的目標驅動電流及各條資料線的初始電流之間的電流差值，輸出驅動訊號至各條資料線。 The driving method according to claim 4, wherein the driving signal is outputted to each data according to the target driving current of the light-emitting diodes electrically connected to each data line and the initial current of each data line The steps of the line specifically include: outputting a driving signal to each data according to the current difference between the target driving current of the light-emitting diodes electrically connected to each data line and the initial current of each data line and the initial current of each data line. line. 如請求項7所述的驅動方法，其中，分別根據各條資料線所電連接的處於工作狀態的發光二極體的目標驅動電流及各條資料線的初始電流之間的電流差值，輸出驅動訊號至各條資料線的步驟之前，還包括：分別判斷各條資料線所電連接的處於非工作狀態的發光二極體的反偏電流之和是否小於各條資料線所電連接的處於工作狀態的發光二極體的目標驅動電流； 若判斷為是，則控制所述n個電流源開啟；若判斷為否，則控制所述n個電流源關閉。 The driving method according to claim 7, wherein the output is respectively based on the current difference between the target driving current of the light-emitting diodes in working state and the initial current of each data line electrically connected to each data line Before the step of driving the signal to each data line, it also includes: separately determining whether the sum of the reverse bias currents of the non-working light-emitting diodes electrically connected to each data line is less than that of each data line electrically connected. The target drive current of the light-emitting diode in the working state; If the judgment is yes, control the n current sources to turn on; if the judgment is no, control the n current sources to turn off. 如請求項5至8中任一項所述的驅動方法，其中，同一時刻，每條資料線上僅有一顆發光二極體處於工作狀態。 The driving method according to any one of claims 5 to 8, wherein, at the same time, only one light-emitting diode on each data line is in the working state. 如請求項7至8中任一項所述的驅動方法，其中，所述驅動訊號為電流訊號，分別輸出至各條資料線的所述電流訊號與所述電流差值的幅值相等，方向相反。 The driving method according to any one of claim 7 to 8, wherein the driving signal is a current signal, and the amplitude of the current signal and the current difference respectively output to each data line are equal, and the direction in contrast.
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