CN1779765A

CN1779765A - Luminescent display device

Info

Publication number: CN1779765A
Application number: CNA2005101268210A
Authority: CN
Inventors: 朴星千; 郭源奎
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung Display Co Ltd
Priority date: 2004-11-22
Filing date: 2005-11-22
Publication date: 2006-05-31
Anticipated expiration: 2025-11-22
Also published as: KR100600346B1; CN100424745C; KR20060056786A

Abstract

A light emitting display includes first and second scan lines arranged in a row direction to transmit first and second scan signals, a data line arranged in a column direction to transmit a data signal, an image display unit including first and second emission control lines arranged in the row direction to transmit first and second emission control signals, respectively, and a pixel formed in a region defined by the first and second scan lines and the data line. The pixel has a driving circuit for receiving the first and second scan signals, the data signal, the first and second emission control signals, and a first power of a first power source to drive a current, a switching circuit connected with the driving circuit to receive the current, the switching circuit for selectively applying the current in accordance with the first and second emission control signals, and first and second organic light emitting diodes (OLEDs) positioned on two different rows of the image display unit and connected with the switching circuit to receive the current in accordance with an operation of the switching circuit and to emit light.

Description

Active display

The cross reference of related application

The application requires to merge its whole contents at this by reference in the korean patent application 10-2004-95979 of submission on November 22nd, 2004 and right of priority and the rights and interests of 10-2004-95980.

Technical field

The present invention relates to active display, more particularly, relate to threshold voltage that can compensation transistor and can have a plurality of active displays that pass through the luminous Organic Light Emitting Diode (OLED) of image element circuit.

Background technology

Recently, the various flat-panel monitors lighter than comparable cathode ray tube (CRT) display weight, that volume is little have been developed.Particularly, the active display with high-luminous-efficiency, high brightness, wide visual angle and high response speed becomes the center that everybody gazes at.

Organic Light Emitting Diode (OLED) has wherein and will be placed on structure between cathode electrode and the anode electrode as the emission layer that is used for luminous film.Electronics and hole are injected in the emission layer, when reducing, they can be reconsolidated to produce luminous exciton with their energy of box lunch.

Fig. 1 shows the part-structure of traditional active display.With reference to Fig. 1, adjacent one another are and each pixel of four pixels comprises an OLED and an image element circuit.Image element circuit comprises the first transistor T1, transistor seconds T2, the 3rd transistor T 3 and capacitor Cst.Each of first, second and the 3rd transistor T 1, T2 and T3 all comprises grid, source electrode and drain electrode; And capacitor Cst comprises first electrode and second electrode.

Because pixel has identical structure, so will only be described in the pixel in the upper left corner in further detail.The source electrode of the first transistor T1 is connected with power supply Vdd, the drain electrode of the first transistor T1 is connected with the source electrode of the 3rd transistor T 3, and the grid of the first transistor T1 is connected with node A.Node A is connected with the drain electrode of transistor seconds T2.The first transistor T1 offers OLED with the electric current corresponding with data-signal.

The source electrode of transistor seconds T2 is connected with data line D1, the drain electrode of transistor seconds T2 is connected with node A, and the grid of transistor seconds T2 is connected with sweep trace S1.Transistor seconds T2 offers node A according to being provided to the sweep signal of its grid with data-signal.

The source electrode of the 3rd transistor T 3 is connected with the drain electrode of the first transistor T1, the drain electrode of the 3rd transistor T 3 is connected with the anode electrode of OLED, and the grid of the 3rd transistor T 3 is connected so that emissioning controling signal is responded with launch-control line E1.Therefore, 3 controls of the 3rd transistor T flow to the mobile light emission with control OLED of the electric current of OLED from the first transistor T1 according to emissioning controling signal.

First electrode of capacitor Cst is connected with power supply Vdd, and second electrode of capacitor Cst is connected with node A.Capacitor Cst is according to the data-signal stored charge and by being that a frame stored charge offers the grid of the first transistor T1 with signal, thereby a frame is kept in the operation of the first transistor T1.

But, according to the pixel that is used for traditional active display, because an OLED is connected with an image element circuit, thereby need a plurality of image element circuits with luminous from a plurality of OLED, therefore need a large amount of image element circuits.

And, owing to a launch-control line need be connected with pixel column, so the reason of launch-control line has caused the aperture of active display to compare variation.

Summary of the invention

Therefore, embodiments of the present invention provide a kind of pixel and have used the active display of this pixel, the threshold voltage of compensation transistor wherein, thus although there is deviation in the threshold voltage, the consistent electric current that produces consistent brightness flows to Organic Light Emitting Diode (OLED).Embodiments of the present invention provide a plurality of OLED and use active display by the luminous described a plurality of OLED of image element circuit, thereby present embodiment can reduce the quantity of the image element circuit of active display, the quantity of data line and the quantity of pixel power lead, thereby reduce the size of data-driven parts, therefore improve the aperture ratio.Embodiments of the present invention provide pixel and use the active display of this pixel, can control the launch time of a plurality of OLED and put to minimize color discontinuous (breakup).

An embodiment of the invention provide a kind of active display, and it has: first and second sweep traces of arranging with line direction that are used for transmitting first and second sweep signals, the data line of arranging with column direction that is used for transmission of data signals, be included in line direction and arrange image-display units with first and second launch-control lines that transmit first and second emissioning controling signals respectively and the pixel that forms in the zone that is limited by first and second sweep traces and data line.Pixel has: driving circuit is used to receive first power of first and second sweep signals, data-signal, first and second emissioning controling signals and first power supply with drive current; On-off circuit is connected to driving circuit with received current, and this on-off circuit is used for optionally applying electric current according to first and second emissioning controling signals; And first and second Organic Light Emitting Diodes (OLED), be placed on to be connected with operation on two different rows of image-display units and with on-off circuit and come received current and luminous according to on-off circuit.Driving circuit has: the first transistor, and be used to receive first power of first power supply and be used for electric current is offered first and second OLED, described electric current is corresponding with the voltage of the grid that is applied to the first transistor; Transistor seconds is used for optionally data-signal being put on according to first sweep signal first electrode of the first transistor; The 3rd transistor is used for optionally forming between the grid of second electrode of the first transistor and the first transistor according to first sweep signal and is electrically connected; Capacitor, be used for when data-signal being put on first electrode of the first transistor the voltage that storage puts on the grid of the first transistor, and be used for when at least one of first and second OLED is luminous, will keeping the preset time section in the grid place of the first transistor stored voltage; The 4th transistor is used for optionally initializing signal being put on capacitor according to second sweep signal; The 5th transistor is used for optionally first power of first power supply being put on the first transistor according to first emissioning controling signal; And the 6th transistor, be used for first power supply optionally being put on the first transistor according to second emissioning controling signal.

An embodiment of the invention provide a kind of active display, the data line that is used for transmission of data signals that it has first and second sweep traces that are used for transmitting first and second sweep signals arranged with line direction, arrange with column direction, are included in line direction and arrange image-display units with first and second launch-control lines that transmit first and second emissioning controling signals respectively and the pixel that forms in the zone that is limited by first and second sweep traces and data line.Pixel has: driving circuit is used to receive first power of first and second sweep signals, data-signal, first and second emissioning controling signals and first power supply with drive current; On-off circuit is connected to driving circuit with received current, and this on-off circuit is used for optionally applying electric current according to first and second emissioning controling signals; And first and second Organic Light Emitting Diodes (OLED), be placed on to be connected with operation on two different rows of image-display units and with on-off circuit and come received current and luminous according to on-off circuit.Driving circuit has: the first transistor has first and second electrodes that are connected with first and second nodes respectively, and has the third electrode that is connected with the 3rd node; Transistor seconds has respectively first and second electrodes that are connected with Section Point with data line, and has the third electrode that is connected with first sweep trace; The 3rd transistor has respectively and first first and second electrodes that are connected with the 3rd node, and has the third electrode that is connected with first sweep trace; The 4th transistor has respectively first and second electrodes that are connected with the initializing signal line with the 3rd node, and has the third electrode that is connected with second sweep trace; And capacitor, have first electrode that is connected with first power supply and second electrode that is connected with the 3rd node; The 5th transistor has respectively first and second electrodes that are connected with first power supply with Section Point, and has the third electrode that is connected with first launch-control line; With the 6th transistor, have first and second electrodes that are connected respectively with the Section Point and first power supply, and have the third electrode that is connected with second launch-control line.

An embodiment of the invention provide a kind of active display, the data line that is used for transmission of data signals that it has first and second sweep traces that are used for transmitting first and second sweep signals arranged with line direction, arrange with column direction, are included in line direction and arrange image-display units with first and second launch-control lines that transmit first and second emissioning controling signals respectively and the pixel that forms in the zone that is limited by first and second sweep traces and data line.Pixel has: driving circuit is used to receive first power of first and second sweep signals, data-signal, first and second emissioning controling signals and first power supply with drive current; On-off circuit is connected to driving circuit with received current, and this on-off circuit is used for optionally applying electric current according to first and second emissioning controling signals; And first and second Organic Light Emitting Diodes (OLED), be placed on to be connected with operation on two different rows of image-display units and with on-off circuit and come received current and luminous according to on-off circuit.Driving circuit has: the first transistor has first and second electrodes that are connected with first and second nodes respectively, and has the third electrode that is connected with the 3rd node; Transistor seconds has respectively first and second electrodes that are connected with first node with data line, and has the third electrode that is connected with first sweep trace; The 3rd transistor has respectively and second first and second electrodes that are connected with the 3rd node, and has the third electrode that is connected with first sweep trace; The 4th transistor has respectively first and second electrodes that are connected with the initializing signal line with the 3rd node, and has the third electrode that is connected with second sweep trace; And capacitor, have first electrode that is connected with first power supply and second electrode that is connected with the 3rd node; The 5th transistor has respectively first and second electrodes that are connected with first power supply with Section Point, and has the third electrode that is connected with first launch-control line; With the 6th transistor, have first and second electrodes that are connected respectively with the Section Point and first power supply, and have the third electrode that is connected with second launch-control line.

Description of drawings

Accompanying drawing has illustrated example embodiment of the present invention with instructions, and is used from explanation principle of the present invention with instructions one.

Fig. 1 shows the part-structure of traditional active display;

Fig. 2 shows the structure of the active display of first embodiment of the invention;

Fig. 3 shows the circuit diagram of first embodiment of pixel of the active display of Fig. 2;

Fig. 4 shows the circuit diagram of second embodiment of pixel of the active display of Fig. 2;

Fig. 5 show according to the embodiment of the present invention Fig. 3 and the sequential chart of the operation of the pixel of Fig. 4;

Fig. 6 shows wherein according to the embodiment of the present invention the sequential chart of operation of situation of the pixel of Fig. 3 of forming with nmos pass transistor and Fig. 4;

Fig. 7 shows the sequential chart according to the luminescence process of the active display of embodiment of the present invention;

Fig. 8 A and 8B show a frame of the active display that is split into two son fields;

Fig. 9 shows the structure of the active display of second embodiment of the invention;

Figure 10 shows the structure of the active display of the 3rd embodiment of the present invention;

Figure 11 shows the circuit diagram of embodiment of pixel of the active display of Fig. 9;

Figure 12 shows the oscillogram of the signal of the active display that is transferred to the pixel of using Figure 11;

Figure 13 shows the circuit diagram of first embodiment of pixel of the active display of Figure 10;

Figure 14 shows the circuit diagram of second embodiment of pixel of the active display of Figure 10;

Figure 15 shows the oscillogram of the signal of the active display that is transferred to the pixel of using Figure 13 and Figure 14; With

Figure 16 A, 16B, 16C and 16D show the luminescence process of the active display of Fig. 9.

Embodiment

In the following detailed description, with way of illustration, illustrate and described specific example embodiment of the present invention.Should be realized that as those of ordinary skill in the art, as long as just can make amendment to described example embodiment in various manners without departing from the spirit and scope of the present invention.Therefore, accompanying drawing and describe is considered to illustrative in essence, rather than restrictive.

Fig. 2 shows the structure of the active display of first embodiment of the present invention.With reference to Fig. 2, this active display comprises image-display units 100a, data driver 200a and scanner driver 300a.

Image-display units 100a be included in the multi-strip scanning line S0 that arranges in the line direction, S1, S2 ... .Sn-1 and Sn, many first launch-control line E11, E12 that in line direction, arrange ... .E1n-1 and E1n and many second launch-control line E21, E22 ... .E2n-1 and E2n, many data line D1, D2 that in column direction, arrange ...., Dm-1 and Dm, be used for providing many pixel power lead (not shown) and a plurality of image element circuit 110a of pixel power (pixel power) from the pixel power supply.In the present embodiment, the first and second OLED (not shown) are connected with each image element circuit 110a.

Will from sweep trace S0, S1, S2 ... .Sn-1 and Sn, data line D1, D2 ... .., Dm-1 and Dm, and sweep signal, data-signal and pixel power that pixel power lead transmission comes be transferred to image element circuit 110a, thereby the transistor seconds (not shown) that comprises in image element circuit 110a produces the drive current corresponding with data-signal.According to by the first launch-control line E11, E12 ... .E1n-1 and E1n and the second launch-control line E21, E22 ... first and second emissioning controling signals of .E2n-1 and E2n transmission, thus drive current is transferred to the OLED display image.

First and second OLED are connected with an image element circuit 110a and are placed on different rows, same column.The color that first and second OLED emission is identical.

Therefore, owing to by an image element circuit 110a electric current is offered two OLED, that is, first and second OLED are so thereby the quantity that can reduce image element circuit 110a improves the aperture ratio of image-display units 100a.Because first and second OLED launch identical color and are placed on identical listing, so by a data line input same color data-signal, and can easily carry out gamma correction.

With data driver 200a and data line D1, D2 ... .., Dm-1 are connected with Dm to give image-display units 100a with data signal transmission.

Scanner driver 300a be formed on image-display units 100a a side and with sweep trace S0, S1, S2 ... .Sn-1 and Sn, the first launch-control line E11, E12 ... .E1n-1 and E1n and the second launch-control line E21, E22 ... .E2n-1 is connected with E2n, to provide the sweep signal and first and second emissioning controling signals, therefore sequentially select each row of image-display units 100a to image-display units 100a.Then, data-signal is put on selected row, thereby image element circuit 110a comes according to data-signal and first and second emissioning controling signal luminous by data driver 200a.

Fig. 3 shows the circuit diagram according to first embodiment of the pixel of the active display of Fig. 2 of the present invention.With reference to Fig. 3, pixel comprises image element circuit (for example image element circuit 110a) and OLED.

Image element circuit comprises driving circuit 111a, the first on-off circuit 112a and second switch circuit 113a.Driving circuit 111a comprises the first, second, third, fourth, the 5th and the 6th transistor M11, M21, M31, M41, M51 and M61 and capacitor Csta.The first on-off circuit 112a comprises the 7th transistor M71.Second switch circuit 113a comprises the 8th transistor M81.Each transistor all comprises source electrode, drain and gate.Capacitor Csta comprises first electrode and second electrode.

Because first to the 8th transistor M11 does not have the physics difference to drain electrode and the source electrode of M81, so each source electrode and drain electrode can be called first electrode and second electrode.

The source electrode of the first transistor M11 is connected with first node A1, the drain electrode of the first transistor M11 is connected with Section Point B1, and the grid of the first transistor M11 is connected with the 3rd node C1, thereby according to the voltage of the 3rd node C1, electric current flows to Section Point B1 from first node A1.

The source electrode of transistor seconds M21 is connected with data line Dm, the drain electrode of transistor seconds M21 is connected with Section Point B1, the grid of transistor seconds M21 is connected with the first sweep trace Sn, thereby transistor seconds M21 carries out switching manipulation optionally will put on Section Point B1 from the data-signal that data line Dm transmission comes according to the first sweep signal sn by first sweep trace Sn transmission.

The source electrode of the 3rd transistor M31 is connected with the 3rd node C1, the drain electrode of the 3rd transistor M31 is connected with first node A1, and the grid of the 3rd transistor M31 is connected with the first sweep trace Sn, thereby makes the electromotive force of first node A1 equate with the electromotive force of the 3rd node C1 by the first sweep signal sn by first sweep trace Sn transmission.Therefore, the first transistor M11 can be carried out similar diode connection so that electric current (in a direction) the first transistor M11 flows through.

The source electrode of the 4th transistor M41 is connected with the second sweep trace Sn-1 with grid, and the drain electrode of the 4th transistor M41 is connected with the 3rd node C1, thereby the 4th transistor M41 is transferred to the 3rd node C1 with initializing signal.Initialize signal is the second sweep signal sn-1, it is imported be chosen in the row of the input first sweep signal sn with delegation before the row of selecting.Just, the sweep trace that the row of delegation is connected before the row that the second sweep trace Sn-1 indicates with the first sweep trace Sn is attached thereto.

The source electrode of the 5th transistor M51 is connected with pixel power supply Vdd, the drain electrode of the 5th transistor M51 is connected with Section Point B1, and the grid of the 5th transistor M51 is connected with the first launch-control line E1n, thereby the 5th transistor M51 comes optionally the pixel power of pixel power supply Vdd is put on Section Point B1 according to the first emissioning controling signal e1n by first launch-control line E1n transmission.

The source electrode of the 7th transistor M71 is connected with first node A1, the drain electrode of the 7th transistor M71 is connected with an OLED (being OLED 11), and the grid of the 7th transistor M71 is connected with the first launch-control line E1n, thereby the 7th transistor M71 will be according to putting on an OLED by the electric current of first node A1 input by the first emissioning controling signal e1n of first launch-control line E1n transmission, and promptly OLED 11.

The source electrode of the 6th transistor M61 is connected with pixel power supply Vdd, the drain electrode of the 6th transistor M61 is connected with Section Point B1, and the grid of the 6th transistor M61 is connected with the second emissioning controling signal E2n, thereby the 6th transistor M61 comes optionally the pixel power of pixel power supply Vdd is put on Section Point B1 according to the second emissioning controling signal e2n by second emissioning controling signal E2n transmission.

The source electrode of the 8th transistor M81 is connected with first node A1, the drain electrode of the 8th transistor M81 is connected with the 2nd OLED (being OLED 21), and the grid of the 8th transistor M81 is connected with the second launch-control line E2n, thereby the 8th transistor M81 puts on the 2nd OLED according to the second emissioning controling signal e2n by second launch-control line E2n transmission with the electric current by first node A1 input, and promptly OLED 21.

First electrode of capacitor Csta is connected with pixel power supply Vdd, and second electrode of capacitor Csta is connected with the 3rd node C1, thereby come initialization capacitor Csta through the signal that the 4th transistor M41 transmits by initialization.Capacitor Csta keeps voltage one preset time of the grid that is applied in the first transistor M11.

The OLED of the pixel of Fig. 3 comprises an OLED (being OLED 11) and the 2nd OLED (being OLED 21).The one OLED (being OLED 11) is connected with the 8th transistor M81 with the 7th transistor M71 respectively with the 2nd OLED (being OLED 21), with received current.Come the input of Control current by the first launch-control line E1n and the second launch-control line E2n.The one OLED (being OLED 11) and the 2nd OLED (being OLED 21) are placed on different rows, same column.

Fig. 4 shows the circuit diagram of second embodiment of pixel of the active display of Fig. 2.With reference to Fig. 4, pixel comprises an image element circuit and a plurality of OLED.

Image element circuit comprises driving circuit 111b, the first on-off circuit 112b and second switch circuit 113b.Driving circuit 111b comprises the first, second, third, fourth, the 5th and the 6th transistor M12, M22, M32, M42, M52 and M62 and capacitor Cstb.The first on-off circuit 112b comprises the 7th transistor M72.Second switch circuit 113b comprises the 8th transistor M82.Each transistor comprises source electrode, drain and gate.Capacitor Cstb comprises first electrode and second electrode.

Because first to the 8th transistor M12 does not have the physics difference to source electrode and the drain electrode of M82, so each source electrode and drain electrode can be called first electrode and second electrode.

The drain electrode of the first transistor M12 is connected with first node A2, the source electrode of the first transistor M12 is connected with Section Point B2, and the grid of the first transistor M12 is connected with the 3rd node C2, thereby electric current flows to Section Point B2 according to the voltage of the 3rd node C2 from first node A2.

The source electrode of transistor seconds M22 is connected with data line Dm, the drain electrode of transistor seconds M22 is connected with first node A2, and the grid of transistor seconds M22 is connected with the first sweep trace Sn, thereby transistor seconds M22 carries out switching manipulation according to the first sweep signal sn by first sweep trace Sn transmission, optionally will put on first node A2 by data line Dm data signals transmitted.

The source electrode of the 3rd transistor M32 is connected with Section Point B2, the drain electrode of the 3rd transistor M32 is connected with the 3rd node C2, and the grid of the 3rd transistor M32 is connected with the first sweep trace Sn, thereby makes that by the first sweep signal sn electromotive force of Section Point B2 is identical with the electromotive force of the 3rd node C2 through first sweep trace Sn transmission.Therefore, the first transistor M12 can work in the diode mode, and the first transistor M12 flows through to make electric current (in a direction).

The source electrode of the 4th transistor M42 is connected with the anode electrode of OLED 22, the grid of the 4th transistor M42 is connected with the second sweep trace Sn-1, and the drain electrode of the 4th transistor M42 is connected with the 3rd node C2.According to the second sweep signal sn-1 by second sweep trace Sn-1 transmission, when not having electric current to flow to the 3rd node C2 by OLED 22, the 4th transistor M42 applies voltage between OLED 22 and cathode electrode voltage Vss, and the voltage between use OLED 22 and the cathode voltage Vss is as initializing signal.

The source electrode of the 5th transistor M52 is connected with pixel power supply Vdd, the drain electrode of the 5th transistor M52 is connected with Section Point B2, and the grid of the 5th transistor M52 is connected with the first launch-control line E1n, thereby the 5th transistor M52 comes optionally the pixel power of pixel power supply Vdd is put on Section Point B2 according to the first emissioning controling signal e1n by first launch-control line E1n transmission.

The source electrode of the 6th transistor M62 is connected with pixel power supply Vdd, the drain electrode of the 6th transistor M62 is connected with Section Point B2, and the grid of the 6th transistor M62 is connected with the second emissioning controling signal E2n, thereby the 6th transistor M62 comes optionally the pixel power of pixel power supply Vdd is put on Section Point B2 according to the second emissioning controling signal e2n by second launch-control line E2n transmission.

The source electrode of the 7th transistor M72 is connected with first node A2, the drain electrode of the 7th transistor M72 is connected with an OLED (being OLED 12), and the grid of the 7th transistor M72 is connected with the first launch-control line E1n, thereby the 7th transistor M72 puts on an OLED (being OLED 12) according to the first emissioning controling signal e1n by first launch-control line E1n transmission with the electric current by first node A2 input.

The source electrode of the 8th transistor M82 is connected with first node A2, the drain electrode of the 8th transistor M82 is connected with the 2nd OLED (being OLED 22), and the grid of the 8th transistor M82 is connected with the second launch-control line E2n, thereby the 8th transistor M82 puts on the 2nd OLED (being OLED 22) according to the second emissioning controling signal e2n by second launch-control line E2n transmission with the electric current by first node A2 input.

First electrode of capacitor Cstb is connected with pixel power supply Vdd and second electrode of capacitor Cstb is connected with the 3rd node C2, thus by initialization through the signal of the 4th transistor M42 transmission with capacitor Cstb initialization.Capacitor Cstb keeps a preset time with the grid voltage of the first transistor M12.

The OLED of the pixel of Fig. 4 comprises an OLED (being OLED 12) and the 2nd OLED (being OLED 22).The one OLED (being OLED 12) is connected with the 8th transistor M82 with the 7th transistor M71 respectively with the 2nd OLED (being OLED 22), with received current.Come the input of Control current by the first launch-control line E1n and the second launch-control line E2n.The one OLED (being OLED 12) and the 2nd OLED (being OLED 22) are placed on different rows, same column.

Fig. 5 shows the sequential chart of operation of the pixel of Fig. 3 and 4.With reference to Fig. 5, operate each pixel by the first sweep signal sn, the second sweep signal sn-1, the first emissioning controling signal e1n and the second emissioning controling signal e2n.The division of operations of pixel is an OLED wherein, i.e. the luminous very first time section Ta1 of OLED 1 (for example OLED 11 or OLED 12) and wherein the 2nd OLED, the i.e. second luminous time period Ta2 of OLED 2 (for example OLED 21 or OLED 22).

In very first time section Ta1, when all being maintained high level, each of the first sweep signal sn, the first emissioning controling signal e1n and the second emissioning controling signal e2n at first the second sweep signal sn-1 is transformed to low level from high level, thus conducting the 4th transistor M4 (for example M41 or M42).Therefore, initializing signal is transferred to the 3rd node C (for example C1 or C2) with initialization capacitor Cst (for example Csta or Cstb).At this moment, in Fig. 3, form initializing signal by the second sweep signal sn-1.In Fig. 4, when the 7th and the 8th transistor M7 (for example M72) and M8 (for example M82) being ended, form initializing signal by the voltage that is applied to OLED (for example OLED 22) by the first and second emissioning controling signal e1n and e2n.

Then, when in very first time section Ta1 with the second sweep signal sn-1 after low level is transformed to high level, when each of the first and second emissioning controling signal e1n and e2n is all maintained high level, the first sweep signal sn is transformed to low level from high level, thereby with the second and the 3rd transistor M2 (for example M21 or M22) and M3 (for example M31 or M32) conducting.When with the second and the 3rd transistor M2 and M3 conducting, make the electromotive force of first node A (for example A1) or Section Point B (for example B2) equate, thereby electric current is flowed through with the first transistor M1 (for example M11 or M12) of diode operation with the electromotive force of the 3rd node C (for example C1 or C2); Thereby flow through by electric current wherein, with the first transistor M1 of diode operation, will put on the 3rd node C1 by the data line data signals transmitted; Thereby and will put on second electrode of capacitor Cst with the poor corresponding voltage between the threshold voltage of the voltage of data-signal and the first transistor M.

The first sweep signal sn is transformed to high level and is maintaining high level after one schedule time, when the first emissioning controling signal e1n is transformed to low level and maintains low level during one schedule time, be low levelly simultaneously each of the first sweep signal sn, the second sweep signal sn-1 and the second emissioning controling signal e2n all to be maintained high level at the first emissioning controling signal e1n.At this moment, by the first emissioning controling signal e1n conducting the 5th and the 7th transistor M5 (for example M51 or M52) and M7 (for example M71 or M72), thereby will be applied between the grid and source electrode of the first transistor M1 by the voltage that equation 1 obtains.

[equation 1]

Vgs＝Vdd-(Vdata-|Vth|)

Wherein, Vgs, Vdd, Vdata and Vth are illustrated respectively in source electrode and the voltage between the grid, pixel supply voltage, the voltage of data-signal and the threshold voltage of the first transistor M1 of the first transistor M1.

The 7th transistor M7 is switched on, thereby the electric current that is obtained by equation 2 flows to OLED OLED 1.

[equation 1]

I_{OLED} = \frac{β}{2} (Vsg - {| Vth |}^{2}) = \frac{β}{2} {(Vdata - Vdd + | Vth | - | Vth |)}^{2} = \frac{β}{2} {(Vdata - Vdd)}^{2}

I wherein _OLED, Vsg, Vdd, Vth and Vdata represent to flow to the threshold voltage of the electric current of OLED OLED 1, the voltage that is applied to the grid of the first transistor M1, pixel power source voltage, the first transistor M1 and the voltage of data-signal respectively.

Therefore, shown in equation 2, regardless of the threshold voltage of the first transistor M1, electric current all flows to an OLED, and promptly OLED 1.

At the second time period Ta2, the second sweep signal sn-1 be in once more low level with initialization capacitor Cst after, the first sweep signal sn is in low level data-signal is sent to first node A (for example A1 or A2).Because the 3rd transistor M3 electric current flows through with the first transistor M1 of diode mode work, thereby store voltages that will be corresponding with the voltage of data-signal applies the voltage that obtains by equation 1 in capacitor Cst and between the source electrode of the first transistor M1 and grid.

Then, when the second emissioning controling signal e2n maintains low level one preset time, the 6th and the 8th transistor M6 (for example M61 or M62) and M8 (for example M81 or M82) thus being switched on the electric current that obtains by equation 2 flows to the 2nd OLED, promptly OLED 2.

Therefore, first and second OLED that are connected with an image element circuit, promptly OLED 1 and OLED 2 are sequentially luminous.

Fig. 6 shows wherein the sequential chart of operation of situation that forms the pixel of Fig. 3 and 4 with nmos pass transistor rather than PMOS transistor.With reference to Fig. 6, operate each pixel by the first sweep signal sn, the second sweep signal sn-1, the first emissioning controling signal e1n and the second emissioning controling signal e2n.With the division of operations of pixel is the wherein luminous very first time section Tb1 of an OLED (for example OLED 11 or OLED 12) and the wherein second luminous time period Tb2 of the 2nd OLED (for example OLED 21 or OLED 22).

Fig. 7 shows the sequential chart of the luminescence process of active display according to the embodiment of the present invention.With reference to Fig. 7, with the serial input data division of signal be the first data-signal d1, the d3 that are input to odd-numbered line ... .dm-3 and dm-1 and be input to even number line the second data-signal d2, d4 ... .dm-2 and dm.When from data driver (for example data driver 200a) the output first data-signal d1, d3 ... .dm-3 and dm-1 and when being input to odd-numbered line, with the second data-signal d2, d4 ... .dm-2 and dm are input to data driver (for example, data driver 200a).Here, number between 1 and the numeral of line number of indication active display between.Luminous time period of odd-numbered line wherein is called first son, and wherein the luminous time period of even number line is called second son.One frame comprises the first son field and the second son field.

In operation, at first according to sweep signal (for example s1, s2, s3 ... .. and sn) with the first data-signal d1, d3 ... .dm-3 and dm-1 sequentially are input to odd-numbered line.At this moment, sequentially import first emissioning controling signal (for example e11, e12, e13....e1n), thereby the OLED in each image element circuit (for example OLED 11 or OLED 12) is luminous, so odd-numbered line is luminous.Therefore, with reference to Fig. 8 A, the first son field is luminous shown in Fig. 8 A.

Then, according to sweep signal with the second data-signal d2, d4 ... .dm-2 and dm are input to even number line in proper order.At this moment, second emissioning controling signal sequentially is input to even number line, thereby the 2nd OLED in each image element circuit (for example OLED 21 or OLED 22) is luminous, so even number line is luminous.Therefore, with reference to Fig. 8 B, the second son field is luminous shown in Fig. 8 B.

When the first and second son fields were luminous, all OLED were luminous to finish a frame.

Fig. 9 shows the structure of the active display of second embodiment of the present invention.With reference to Fig. 9, this active display comprises image-display units 100b, data driver 200b and scanner driver 300b.

Image-display units 100b comprises a plurality of image element circuit 110b, the a plurality of sweep trace S1 that in line direction, arrange, S2, ... Sn-1 and Sn, many first launch-control line E11 that in line direction, arrange, E12, ... .E1n-1 and E1n, many second launch-control line E21, E22, ... .E2n-1 and E2n, many articles the 3rd launch-control line E31, E32, ... .E3n-1 and E3n and many articles the 4th launch-control line E41, E42, ... .E4n-1 and E4n, many data line D1 that in column direction, arrange, D2, ... Dm-1 and Dm, and many pixel power lead (not shown) that are used to provide pixel power.The pixel power lead receives pixel power from the external pixels power supply that pixel power is provided.

According to from sweep trace S1, S2 ... sweep signal and sweep signal that Sn-1 and Sn transmission comes, will from data line D1, D2 ... the data signal transmission that Dm-1 and Dm transmission come is in image element circuit 110b.Image element circuit 110b produces the electric current corresponding with data-signal, according to from the first launch-control line E11, E12 ... .E1n-1 and E1n to the four launch-control line E41, E42 ... the first, second, third and the 4th emissioning controling signal that .E4n-1 and E4n transmission comes, thus with this current delivery to the OLED display image.

With data driver 200b and data line D1, D2 ... Dm-1 be connected with Dm with data signal transmission to image-display units 100b.Data driver 200b is sequentially with red and green, green and blue or blue and red data transmission to a data line.

Scanner driver 300b be formed on image-display units 100b a side and with multi-strip scanning line S1, S2 ... Sn-1 and Sn and many first launch-control line E11, E12 ... .E1n-1 and E1n to many articles the 4th launch-control line E41, E42 ... .E4n-1 is connected with E4n, thereby sweep signal and the first, second, third and the 4th emissioning controling signal are transferred to image-display units 100b.

Figure 10 shows the structure according to the active display of third embodiment of the invention.With reference to Figure 10, active display comprises image-display units 100c, data driver 200c and scanner driver 300c.

Image-display units 100c comprises a plurality of image element circuit 110c, four OLED (not shown) that are connected with each image element circuit 110c, the multi-strip scanning line S0 that in line direction, arranges, S1, S2, ... Sn-1 and Sn, many first launch-control line E11 that in line direction, arrange, E12, ... .E1n-1 and E1n, many second launch-control line E21, E22, ... .E2n-1 and E2n, many articles the 3rd launch-control line E31, E32, ... .E3n-1 and E3n and many articles the 4th launch-control line E41, E42, ... .E4n-1 and E4n, many data line D1 that in column direction, arrange, D2, ... Dm-1 and Dm, and many pixel power lead (not shown) that are used to provide pixel power.The pixel power lead receives pixel power from the external pixels power supply that pixel power is provided.

Each image element circuit 110c by sweep trace S0, S1, S2 ... Sn-1 and Sn receive the sweep signal of current scan line and the sweep signal of sweep trace (for example Sn-1 and Sn) before, and produce with from data line D1, D2 ... Dm-1 and Dm transmit the electric current of next data-signal correspondence.According to by the first launch-control line E11, E12 ... .E1n-1 and E1n to the four launch-control line E41, E42 ... thereby the first, second, third and the 4th emissioning controling signal that .E4n-1 and E4n transmission comes is transferred to four OLED display images with drive current.

With data driver 200c and data line D1, D2 ... Dm-1 be connected with Dm with data signal transmission to image-display units 100c.Data driver 200c is sequentially with red and green, green and blue or blue and red data transmission to a data line.

Scanner driver 300c be formed on image-display units 100c a side and with a plurality of sweep trace S0, S1, S2 ... Sn-1 and Sn and many first launch-control line E11, E12 ... .E1n-1 and E1n to the four launch-control line E41, E42 ... .E4n-1 is connected with E4n, thereby sweep signal and the first, second, third and the 4th emissioning controling signal are transferred to image-display units 100c.

Figure 11 shows the circuit diagram of embodiment of pixel of the active display of Fig. 9.With reference to Figure 11, pixel comprises four OLED and an image element circuit (for example image element circuit 110b).With four OLED is that OLED13, OLED23, OLED33 and OLED43 are connected with an image element circuit.Image element circuit (for example image element circuit 110b) comprises driving circuit 111c, the first on-off circuit 112c and second switch circuit 113c.

Driving circuit 111c comprises the first and second transistor M13 and M23 and capacitor Cstc.The first on-off circuit 112c comprises third and fourth transistor M33 and the M43.Second switch circuit 113c comprises the 5th and the 6th transistor M53 and M63.

First to the 6th transistor M13 comprises source electrode, drain and gate to each of M63.Because first to the 6th transistor M13 does not have the physics difference to drain electrode and the source electrode of M63, so, each source electrode and drain electrode can be called first electrode and second electrode.And capacitor Cstc comprises first electrode and second electrode.Four OLED are called first to the 4th OLED, and promptly OLED 13 to OLED 43.

The source electrode of the first transistor M13 is connected with pixel power lead Vdd, the drain electrode of the first transistor M13 is connected with first node A3, and the grid of the first transistor M13 is connected with Section Point B3, thereby determines to flow to from the source electrode of the first transistor M13 the magnitude of current of the drain electrode of the first transistor M13 according to the voltage of the grid that is applied to the first transistor M13.

The source electrode of transistor seconds M23 is connected with data line Dm, the drain electrode of transistor seconds M23 is connected with Section Point B3, and the grid of transistor seconds M23 is connected with sweep trace Sn, thereby transistor seconds M23 carries out conducting and ends operation optionally data-signal is put on Section Point B3 according to the sweep signal sn by sweep trace Sn transmission.

The source electrode of the 3rd transistor M33 is connected with first node A3, the drain electrode of the 3rd transistor M33 and an OLED, be OLED 13, connect, and the grid of the 3rd transistor M33 is connected with the first launch-control line E1n, thereby the 3rd transistor M33 carries out conducting and is applied to an OLED by the electric current of operating with the first node A3 that optionally will flow through according to the first emissioning controling signal e1n that receives by the first launch-control line E1n, and promptly OLED 13.

The source electrode of the 4th transistor M43 is connected with first node A3, the drain electrode of the 4th transistor M43 and the 2nd OLED, be OLED 23, connect, and the grid of the 4th transistor M43 is connected with the second launch-control line E2n, thereby the 4th transistor M43 carries out conducting and is applied to the 2nd OLED by the electric current of operating with the first node A3 that optionally will flow through according to the second emissioning controling signal e2n that receives by the second launch-control line E2n, and promptly OLED 23.

The source electrode of the 5th transistor M53 is connected with first node A3, the drain electrode of the 5th transistor M53 and the 3rd OLED, be that OLED 33 connects, and the grid of the 5th transistor M53 is connected with the 3rd launch-control line E3n, thereby according to the 3rd emissioning controling signal e3n by the 3rd launch-control line E3n transmission, the electric current that the 5th transistor M53 optionally will flow to the drain electrode of the 5th transistor M53 from the source electrode of the 5th transistor M53 puts on the 3rd OLED, be OLED 33, with from the 3rd OLED, promptly OLED 33 is luminous.

The source electrode of the 6th transistor M63 is connected with first node A3, the drain electrode of the 6th transistor M63 is that OLED 43 is connected with the 4th OLED, and the grid of the 6th transistor M63 is connected with the 4th launch-control line E4n, thereby the 6th transistor M63 puts on the 4th OLED according to the electric current that the 4th emissioning controling signal e4n that receives by the 4th launch-control line E4n comes optionally to flow to the drain electrode of the 6th transistor M63 from the source electrode of the 6th transistor M63, be OLED 4, with from the 4th OLED, promptly OLED 4 is luminous.

Figure 12 shows the waveform of the signal of the active display that is transferred to the pixel of using Figure 11.With reference to Figure 12, operate pixel to e4n by sweep signal sn, data-signal and the first, second, third and the 4th emissioning controling signal e1n.The sweep signal sn and first to the 4th emissioning controling signal e1n are to have the cyclical signal of first to the 4th time period T1 to T4 to e4n.

In very first time section Tc1, the first emissioning controling signal e1n is a low level.In the second time period Tc2, the 3rd emissioning controling signal e3n is a low level.In the 3rd time period Tc3, the second emissioning controling signal e2n is a low level.In the 4th time period Tc4, the 4th emissioning controling signal e4n is a low level.In the moment at the starting point place of each time period, sweep signal sn is a low level.

In very first time section Tc1, thereby transistor seconds M23 conducting data-signal is transferred to Section Point B3 by transistor seconds M23 by sweep signal sn.Thereby pixel power be transferred to capacitor Cstc first electrode will and pixel power supply and data-signal between poor Vdd-Vdata corresponding voltage value be stored among the capacitor Cstc.

Capacitor Cstc will put on the grid of the first transistor M13 by Section Point B3 with poor corresponding voltage between pixel power supply and the data-signal, thereby the first transistor M13 flows to first node A3 with the electric current corresponding with data-signal.

Thereby flowing to an OLED by the first emissioning controling signal e1n conducting the 3rd transistor M33 electric current is OLED 13.

At the second time period Tc2, by sweep signal sn and data-signal will and pixel power supply and data-signal between poor corresponding voltage value be stored among the capacitor Cstc, thereby the first transistor M13 flows to first node A3 with the electric current corresponding with data-signal.Thereby flow to the 3rd OLED by the 3rd emissioning controling signal e3n conducting the 5th transistor M53 electric current, promptly OLED 33.

At third and fourth time period Tc3 and the Tc4, the same electric current that produces at the first and second time period Tc1 and Tc2, and electric current flows to first node A3.In the 3rd time period Tc3, by the second emissioning controling signal e2n, electric current flows to the 2nd OLED, and promptly OLED 23.At the 4th time period Tc4, flow to the 4th OLED by the 4th emissioning controling signal e4n electric current, promptly OLED 43.

Therefore, first to the 4th OLED, promptly OLED 13 to OLED 43, and is luminous in order with said sequence.

Figure 13 shows the circuit diagram of first embodiment of pixel of the active display of Figure 10.With reference to Figure 13, pixel comprises four OLED and an image element circuit (for example image element circuit 110c).Four OLED, promptly OLED 14, OLED 24, OLED 34 and OLED 44 are connected with an image element circuit.Image element circuit (for example image element circuit 110c) comprises driving circuit 111d, the first on-off circuit 112d and second switch circuit 113d.

Driving circuit 111d comprises that first to the 8th transistor M14 is to M84 and capacitor Cstd.The first on-off circuit 112d comprises the 9th and the tenth transistor M94 and M104.Second switch circuit 113d comprises the 11 and the tenth two-transistor M114 and M124.Each transistor all comprises source electrode, drain and gate.Capacitor Cstd comprises first electrode and second electrode.

Because first to the tenth two-transistor M14 does not have the physics difference to drain electrode and the source electrode of M124, so each source electrode and drain electrode can be called first electrode and second electrode.

The drain electrode of the first transistor M14 is connected with first node A4, the source electrode of the first transistor M14 is connected with Section Point B4, and the grid of the first transistor M14 is connected with the 3rd node C4, thereby according to the voltage of the 3rd node C4, electric current flows to first node A4 from Section Point B4.

The source electrode of transistor seconds M24 is connected with data line Dm, the drain electrode of transistor seconds M24 is connected with Section Point B4, and the grid of transistor seconds M24 is connected with the first sweep trace Sn, thereby transistor seconds M24 carries out switching manipulation optionally will be transferred to Section Point B4 by data line Dm data signals transmitted according to the first sweep signal sn by first sweep trace Sn transmission.

The source electrode of the 3rd transistor M34 is connected with first node A4, the drain electrode of the 3rd transistor M34 is connected with the 3rd node C4, and the grid of the 3rd transistor M34 is connected with the first sweep trace Sn, thereby makes the electromotive force of first node A4 equate the first transistor M14 so that electric current is flowed through with the electromotive force of the 3rd node C4 according to the first sweep signal sn by first sweep trace Sn transmission.Therefore, the first transistor M14 works in the diode mode.

The source electrode of the 4th transistor M44 is connected with the second sweep trace Sn-1 with grid, and the drain electrode of the 4th transistor M44 is connected with the 3rd node C4, thereby the 4th transistor M44 is applied to the 3rd node C4 with initializing signal.Initializing signal is the second sweep signal sn-1, and it is transfused to the row that is chosen in delegation before the row that the input first sweep signal sn selects, and receives by the second sweep trace Sn-1.Just, the second sweep trace Sn-1 be meant with the row that is connected at the first sweep trace Sn before the sweep trace that connects of the row of delegation.

The source electrode of the 5th transistor M54 is connected with pixel power supply Vdd, the drain electrode of the 5th transistor M54 is connected with Section Point B4, and the grid of the 5th transistor M54 is connected with the first launch-control line E1n, thereby the 5th transistor M54 basis optionally is applied to Section Point B4 with the pixel power of pixel power supply Vdd by the first emissioning controling signal e1n of first launch-control line E1n transmission.

The source electrode of the 6th transistor M64 is connected with pixel power supply Vdd, the drain electrode of the 6th transistor M64 is connected with Section Point B4, and the grid of the 6th transistor M64 is connected with the second launch-control line E2n, thereby the 6th transistor M64 basis optionally is applied to Section Point B4 with the pixel power of pixel power supply Vdd by the second emissioning controling signal e2n of second launch-control line E2n transmission.

The source electrode of the 7th transistor M74 is connected with pixel power supply Vdd, the drain electrode of the 7th transistor M74 is connected with Section Point B4, and the grid of the 7th transistor M74 is connected with the 3rd launch-control line E3n, thereby the 7th transistor M74 basis optionally is applied to Section Point B4 with the pixel power of pixel power supply Vdd by the 3rd emissioning controling signal e3n of the 3rd launch-control line E3n transmission.

The source electrode of the 8th transistor M84 is connected with pixel power supply Vdd, the drain electrode of the 8th transistor M84 is connected with Section Point B4, and the grid of the 8th transistor M84 is connected with the 4th launch-control line E4n, thereby the 8th transistor M84 basis optionally is applied to Section Point B4 with the pixel power of pixel power supply Vdd by the 4th emissioning controling signal e4n of the 4th launch-control line E4n transmission.

The source electrode of the 9th transistor M94 is connected with first node A4, the drain electrode of the 9th transistor M94 is that OLED 14 is connected with an OLED, and the grid of the 9th transistor M94 is connected with the first launch-control line E1n, thereby according to the first emissioning controling signal e1n by first launch-control line E1n transmission, the electric current of first node A4 of flowing through flows to an OLED, be OLED 14, with from an OLED, promptly OLED 14 is luminous.

The source electrode of the tenth transistor M104 is connected with first node A4, the drain electrode of the tenth transistor M104 is that OLED 24 is connected with the 2nd OLED, and the grid of the tenth transistor M104 is connected with the second launch-control line E2n, thereby according to the second emissioning controling signal e2n by second launch-control line E2n transmission, the electric current of first node A4 of flowing through flows to the 2nd OLED, be OLED 24, with from the 2nd OLED, promptly OLED24 is luminous.

The source electrode of the 11 transistor M114 is connected with first node A4, the drain electrode of the 11 transistor M114 is that OLED 34 is connected with the 3rd OLED, and the grid of the 11 transistor M114 is connected with the 3rd launch-control line E3n, thereby according to the 3rd emissioning controling signal e3n by the 3rd launch-control line E3n transmission, the electric current of first node A4 of flowing through flows to the 3rd OLED, be OLED 34, with from the 3rd OLED, promptly OLED 34 is luminous.

The source electrode of the tenth two-transistor M124 is connected with first node A4, the drain electrode of the tenth two-transistor M124 is that OLED 44 is connected with the 4th OLED, and the grid of the tenth two-transistor M124 is connected with the 4th launch-control line E4n, thereby according to the 4th emissioning controling signal e4n by the 4th launch-control line E4n transmission, the electric current of first node A4 of flowing through flows to the 4th OLED, be OLED 44, with from the 4th OLED, promptly OLED 44 is luminous.

First electrode of capacitor Cstd is connected with pixel power supply Vdd and second electrode of capacitor Cstd is connected with the 3rd node C4, thereby with capacitor Cstd initialization, and the voltage corresponding with data-signal is transferred to the 3rd node C4 then by capacitor Cstd storage by the initializing signal that is transferred to the 3rd node C4 through the 4th transistor M44.Therefore, the grid voltage of the first transistor M14 is kept a preset time.

Figure 14 shows the circuit diagram of second embodiment of pixel of the active display of Figure 10.With reference to Figure 14, pixel comprises four OLED and an image element circuit (for example image element circuit 110c).Four OLED are that OLED 15, OLED 25, OLED 35 and OLED 45 are connected with an image element circuit.Image element circuit (for example image element circuit 110c) comprises driving circuit 111e, the first on-off circuit 112e and second switch circuit 113e.

Driving circuit 111e comprises that first to the 8th transistor M15 is to M85 and capacitor Cste.The first on-off circuit 112e comprises the 9th and the tenth transistor M95 and M105.Second switch circuit 113e comprises the 11 and the tenth two-transistor M115 and M125.Each transistor comprises source electrode, drain and gate.Capacitor Cste comprises first electrode and second electrode.

Because first to the tenth two-transistor M15 does not have the physics difference to drain electrode and the source electrode of M125, so each source electrode and drain electrode can be called first electrode and second electrode.

The drain electrode of the first transistor M15 is connected with first node A5, the source electrode of the first transistor M15 is connected with Section Point B5, and the grid of the first transistor M15 is connected with the 3rd node C5, thereby according to the voltage of the 3rd node C5, electric current flows to first node A5 from Section Point B5.

The source electrode of transistor seconds M25 is connected with data line Dm, the drain electrode of transistor seconds M25 is connected with first node A5, and the grid of transistor seconds M25 is connected with the first sweep trace Sn, thereby according to the first sweep signal sn by first sweep trace Sn transmission, transistor seconds M25 carries out switching manipulation optionally will be transferred to first node A5 by data line Dm data signals transmitted.

The source electrode of the 3rd transistor M35 is connected with Section Point B5, the drain electrode of the 3rd transistor M35 is connected with the 3rd node C5, and the grid of the 3rd transistor M35 is connected with the first sweep trace Sn, thereby according to the first sweep signal sn by first sweep trace Sn transmission, make the electromotive force of Section Point B5 equate the first transistor M15 with the electromotive force of the 3rd node C5 so that electric current is flowed through.Therefore, the first transistor M15 works in the diode mode.

The source electrode of the 4th transistor M45 is connected with the anode electrode of OLED (for example OLED 35), the drain electrode of the 4th transistor M45 is connected with the 3rd node C5, and the grid of the 4th transistor M45 is connected with the second sweep trace Sn-1, thereby when there not being electric current to flow to first to the 4th OLED, be OLED 15 during to OLED 45, the 4th transistor M45 is applied to the 3rd node C5 according to the second sweep signal sn-1 with voltage.At this moment, will be transferred to the initializing signal of the voltage of the 3rd node C5 according to the second sweep signal sn-1 as initialization capacitor Cste.

The source electrode of the 5th transistor M55 is connected with pixel power supply Vdd, the drain electrode of the 5th transistor M55 is connected with Section Point B5, and the grid of the 5th transistor M55 is connected with the first launch-control line E1n, thereby the 5th transistor M55 basis optionally is applied to Section Point B5 with the pixel power of pixel power supply Vdd by the first emissioning controling signal e1n of first launch-control line E1n transmission.

The source electrode of the 6th transistor M65 is connected with pixel power supply Vdd, the drain electrode of the 6th transistor M65 is connected with Section Point B5, and the grid of the 6th transistor M65 is connected with the second launch-control line E2n, thereby the 6th transistor M65 basis optionally is applied to Section Point B5 with the pixel power of pixel power supply Vdd by the second emissioning controling signal e2n of second launch-control line E2n transmission.

The source electrode of the 7th transistor M75 is connected with pixel power lead Vdd, the drain electrode of the 7th transistor M75 is connected with Section Point B5, and the grid of the 7th transistor M75 is connected with the 3rd launch-control line E3n, thereby the 7th transistor M75 basis optionally is applied to Section Point B5 with the pixel power of pixel power supply Vdd by the 3rd emissioning controling signal e3n of the 3rd launch-control line E3n transmission.

The source electrode of the 8th transistor M85 is connected with pixel power supply Vdd, the drain electrode of the 8th transistor M85 is connected with Section Point B5, and the grid of the 8th transistor M85 is connected with the 4th launch-control line E4n, thereby the 8th transistor M85 is according to optionally the pixel power supply being applied to Section Point B5 by the 4th emissioning controling signal e4n of the 4th launch-control line E4n transmission.

The source electrode of the 9th transistor M95 is connected with first node A5, the drain electrode of the 9th transistor M95 is that OLED 15 is connected with an OLED, and the grid of the 9th transistor M95 is connected with the first launch-control line E1n, thereby according to the first emissioning controling signal e1n by first launch-control line E1n transmission, the electric current of first node A5 of flowing through flows to an OLED, be OLED 15, with from an OLED, promptly OLED 15 is luminous.

The source electrode of the tenth transistor M105 is connected with first node A5, the drain electrode of the tenth transistor M105 is that OLED 25 is connected with the 2nd OLED, and the grid of the tenth transistor M105 is connected with the second launch-control line E2n, thereby according to the second emissioning controling signal e2n by second launch-control line E2n transmission, the electric current of first node A5 of flowing through flows to the 2nd OLED, be OLED 25, with from the 2nd OLED, promptly OLED 25 is luminous.

The source electrode of the 11 transistor M115 is connected with first node A5, the drain electrode of the 11 transistor M115 is that OLED 35 is connected with the 3rd OLED, and the grid of the 11 transistor M115 is connected with the 3rd launch-control line E3n, thereby according to the 3rd emissioning controling signal e3n by the 3rd launch-control line E3n transmission, the electric current of first node A5 of flowing through flows to the 3rd OLED, be OLED 35, with from the 3rd OLED, promptly OLED 35 is luminous.

The source electrode of the tenth two-transistor M125 is connected with first node A5, the drain electrode of the tenth two-transistor M125 is that OLED 45 is connected with the 4th OLED, and the grid of the tenth two-transistor M125 is connected with the 4th launch-control line E4n, thereby according to the 4th emissioning controling signal e4n by the 4th launch-control line E4n transmission, the electric current of first node A5 of flowing through flows to the 4th OLED, be OLED 45, with from the 4th OLED, promptly OLED 45 is luminous.

First electrode of capacitor Cste is connected with pixel power supply Vdd, and second electrode of capacitor Cste is connected with the 3rd node C5, thereby by the initializing signal that is transferred to the 3rd node C5 by the 4th transistor M45 with capacitor Cste initialization, thereby the voltage corresponding with data-signal is stored and is transferred to subsequently the 3rd node C5 by capacitor Cste.Therefore, the grid voltage of the first transistor M15 is kept a preset time.

Figure 15 shows the waveform of the signal that is transferred to the active display that uses the pixel shown in Figure 13 and 14.With reference to Figure 15, operate pixel by the first and second sweep signal sn and sn-1, data-signal and the first, second, third and the 4th emissioning controling signal e1n, e2n, e3n and e4n.The first and second sweep signal sn and sn-1 and first to the 4th emissioning controling signal e1n are to have the cyclical signal of first to the 4th time period Td1 to Td4 to e4n.

In very first time section Td1, the first emissioning controling signal e1n is a low level.In the second time period Td2, the 3rd emissioning controling signal e3n is a low level.In the 3rd time period Td3, the second emissioning controling signal e2n is a low level.In the 4th time period Td4, the 4th emissioning controling signal e4n is a low level.The second sweep signal sn-1 is the sweep signal that is used to be chosen in the row row before of importing first sweep signal sn selection.For the moment of the starting point of each time period, the first sweep signal sn and the second sweep signal sn-1 sequentially are in low level.

In very first time section Td1,, and initializing signal is transferred to capacitor Cst (for example Cstd or Cste) with initialization capacitor Cst by the 4th transistor M4 by the second sweep signal sn-1 conducting the 4th transistor M4 (for example M44 and M45).By the first sweep signal sn conducting transistor seconds M2 (for example M24 or M25) and the 3rd transistor M3 (for example M34 and M35), thereby make the electromotive force of first node A4 or Section Point B5 equate the first transistor M1 so that electric current is flowed through (for example M14 or M15) with the electromotive force of the 3rd node C (for example C4 or C5).Therefore, the first transistor M1 (for example M14 or M15) is connected as diode.By transistor seconds M2 (for example M24 or M25) data-signal is applied to Section Point B4 or Section Point B5.Therefore, by transistor seconds M2 (for example M24 or M25), the first transistor M1 (for example M14 or M15) and the 3rd transistor M3 (for example M34 or M35) data signal transmission is arrived second electrode of capacitor Cst (for example Cstd or Cste), thereby will arrive second electrode of capacitor Cst (for example Cstd or Cste) with the poor corresponding voltage transmission between data-signal and the threshold voltage.

After the first sweep signal sn is transformed to high level, when the first emissioning controling signal e1n is transformed low level and is maintained at low level during one schedule time, by the first emissioning controling signal e1n with the 5th transistor M5 (for example M54 or M55) and the 9th transistor M9 (for example M94 or M95) conducting, thereby the voltage corresponding with equation 1 is put between the grid and source electrode of the first transistor M1 (for example M14 or M15).

The 9th transistor M9 (for example M94 or M95) is switched on, thereby the electric current corresponding with equation 2 flows to an OLED, i.e. OLED 1 (for example OLED 14 or OLED 15).

Therefore, referring now to Figure 13 and 14 and equation 2, regardless of the threshold voltage of the first transistor M14 and M15, it is OLED 14 and OLED 15 that electric current all flows to an OLED.

In the second time period Td2, by first and second sweep signal sn and the sn-1, and the poor corresponding voltage value between pixel power supply and the data-signal is stored among the capacitor Cst (for example Cstd or Cste), and voltage and the data voltage corresponding with equation 1 is transferred to the first transistor M1 (for example M14 or M15).By the 3rd emissioning controling signal e3n, with the 7th transistor M7 (for example M74 or M75) and the 11 transistor M11 (for example M114 or M115) conducting, and the electric current corresponding with equation 2 the 3rd OLED that flows through is OLED 3 (for example OLED 34 and OLED 35).

In the third and fourth time period Td3 and Td4, with the first and second time period Td1 and Td2 in essentially identical mode produce electric current.Just, in the 3rd time period Td3,, be OLED 2 (for example OLED 24 or OLED 25) thereby electric current flows to the 2nd OLED by the second emissioning controling signal e2n conducting the 6th transistor M6 (for example M64 or M65).At the 4th time period Td4,, be OLED 4 (for example OLED 44 or OLED 45) thereby electric current flows to the 4th OLED by the 4th emissioning controling signal e4n conducting the 8th transistor M8 (for example M84 or M85) and the tenth two-transistor M12 (for example M124 or M125).

Therefore, first to the 4th OLED is that OLED 1 to OLED 4 (for example OLED 14 to OLED 44 or OLED 15 to OLED 45) is luminous in order with above-mentioned order.

Figure 16 A shows the emission process of the active display of Fig. 9 to 16D.In image-display units 100b, vertically arrange three image element circuits, thereby arrange 12 OLED with the form of 2 * 6 matrixes.Can be called first image element circuit, second image element circuit and the 3rd image element circuit with going up image element circuit, middle image element circuit and following image element circuit.With reference to Figure 16 A to 16D, because all four OLED are connected with an image element circuit sequentially being that a frame is luminous, so a frame can be divided into four son fields.

The OLED that an image element circuit owing to coexist among two image element circuits adjacent with data line is connected is that OLED 13 and the 3rd OLED are that OLED 33 reception red data signal R are with red-emitting, and the 2nd OLED is that OLED 23 and the 4th OLED are that OLED 43 receives green data signal G with transmitting green light, the OLED that the one other pixel circuit among two circuit of coexisting connects is that OLED 13 and the 3rd OLED are that OLED 33 receives green data signal G with transmitting green light, and the 2nd OLED is that OLED 23 and the 4th OLED are that OLED 43 receives red data signal R with red-emitting.So alternately transmit red data and green data by a data line.

Figure 16 A shows first son field among four son fields.Shown in Figure 16 A, first image element circuit and the 3rd image element circuit are that OLED 13 comes red-emitting by an OLED who receives red data, and second image element circuit is OLED 13 transmitting green lights by an OLED who receives green data, thereby ruddiness and green component are launched simultaneously.

In Figure 16 B that the second son field is shown, first image element circuit and the 3rd image element circuit are that OLED 33 comes transmitting green light by the 3rd OLED that receives green data, and second image element circuit is OLED 33 red-emittings by the 3rd OLED that receives red data, thereby ruddiness and green component are launched simultaneously.And in of third and fourth shown in Figure 16 C and 16D field, ruddiness and green component are launched simultaneously.

When the light time of only launching a kind of color from a son field, it is discontinuous to produce color.But,,, thereby can prevent that by the present invention color is discontinuous from each son while red-emitting, green glow and blue light components owing to, consider the entire image display unit from each son field while red-emitting and green component.The active display of Figure 10 is operating with the essentially identical mode of the display of above-mentioned Fig. 9, thereby the display of Figure 10 also can prevent the discontinuous generation of color.

As mentioned above, according to active display of the present invention, thereby compensated transistorized threshold voltage regardless of the deviation in the threshold voltage, consistent electric current all flows to OLED, therefore makes brightness consistent more.And, thereby a plurality of OLED can reduce the quantity of data line and the quantity of pixel power lead by image element circuit is luminous.

Particularly, because four OLED are connected with an image element circuit of an embodiment, so can reduce the quantity of the image element circuit of active display.Therefore, needed image element circuit lacks with the traditional monitor that an OLED is connected than one of them pixel.Owing to reduced the quantity of image element circuit, so can reduce the quantity of sweep trace, data line and the launch-control line of transmission signals.Therefore, can reduce the size of scanner driver and the size of data driver, thereby can reduce unnecessary space.And, because wiring quantity reduces, so increased the aperture ratio of active display.

And, because reduced the quantity of data line, so thereby the size that can reduce data driver reduces the manufacturing cost of active display.

And, can control the shooting sequence of OLED, so prevent that the color of active display is discontinuous.

Though described the present invention in conjunction with some example embodiment, but it should be appreciated by those skilled in the art that the present invention is not limited to disclosed embodiment, but on the contrary, the present invention attempts to cover the interior various distortion of spirit and scope of claims and equivalent thereof.

Claims

1. active display comprises:

First and second sweep traces that are used to transmit first and second sweep signals with the line direction arrangement;

The data line that is used for transmission of data signals with the column direction arrangement;

Image-display units is included in and arranges in the line direction with first and second launch-control lines that transmit first and second emissioning controling signals respectively and the pixel that forms in the zone that is limited by first and second sweep traces and data line,

Wherein said pixel comprises:

Driving circuit is used to receive first power of first and second sweep signals, data-signal, first and second emissioning controling signals and first power supply with drive current;

On-off circuit is connected to driving circuit with received current, and this on-off circuit is used for optionally applying electric current according to first and second emissioning controling signals; And

First and second Organic Light Emitting Diodes, i.e. OLED is placed on two different rows of image-display units and with on-off circuit and is connected, and comes received current and luminous with the operation according to on-off circuit,

Wherein said driving circuit comprises:

The first transistor is used to receive first power of first power supply and is used for electric current is offered first and second OLED, and described electric current is corresponding with the voltage of the grid that is applied to the first transistor;

Transistor seconds is used for optionally data-signal being put on according to first sweep signal first electrode of the first transistor;

The 3rd transistor is used for optionally forming between the grid of second electrode of the first transistor and the first transistor according to first sweep signal and is electrically connected;

Capacitor, be used for when data-signal being put on first electrode of the first transistor the voltage that storage puts on the grid of the first transistor, and be used for when at least one of first and second OLED is luminous, will keeping a preset time section in the grid place of the first transistor stored voltage;

The 4th transistor is used for optionally initializing signal being put on capacitor according to second sweep signal;

The 5th transistor is used for optionally first power of first power supply being put on the first transistor according to first emissioning controling signal; And

The 6th transistor, be used for according to second emissioning controling signal with first power selection of first power supply put on the first transistor.

2. active display according to claim 1,

Wherein said on-off circuit comprises first on-off circuit and second switch circuit,

Wherein said first on-off circuit comprises the 7th transistor that is used for optionally electric current being put on according to first emissioning controling signal OLED, and

Wherein said second switch circuit comprises the 8th transistor that is used for optionally electric current being put on according to second emissioning controling signal the 2nd OLED.

3. active display according to claim 2,

Wherein said first launch-control line is formed on the driving circuit, and

Wherein near driving circuit, form described second launch-control line.

4. active display according to claim 1, the voltage level that wherein is applied to the grid of described the first transistor are poor between the threshold voltage of the first transistor that obtained of the voltage of data-signal and first power by first power supply.

5. active display according to claim 1, wherein said initializing signal are second sweep signals of second sweep trace, and described second sweep trace is before first sweep signal is input to first sweep trace on it.

6. active display according to claim 1, wherein said initializing signal are when there not being electric current to be applied at least one the voltage of first and second OLED when the first transistor flows to first and second OLED.

7. active display according to claim 1, the light of wherein said first and second OLED emission same color.

8. active display according to claim 1, wherein said first and second OLED are Organic Light Emitting Diodes.

9. active display comprises:

Wherein said pixel comprises:

Wherein said driving circuit comprises:

The first transistor has first and second electrodes that are connected with first and second nodes respectively, and has the third electrode that is connected with the 3rd node;

Transistor seconds has respectively first and second electrodes that are connected with Section Point with data line, and has the third electrode that is connected with first sweep trace;

The 3rd transistor has respectively and first first and second electrodes that are connected with the 3rd node, and has the third electrode that is connected with first sweep trace;

The 4th transistor has respectively first and second electrodes that are connected with the initializing signal line with the 3rd node, and has the third electrode that is connected with second sweep trace; And

Capacitor has first electrode that is connected with first power supply and second electrode that is connected with the 3rd node;

The 5th transistor has respectively first and second electrodes that are connected with first power supply with Section Point, and has the third electrode that is connected with first launch-control line; With

The 6th transistor has first and second electrodes that are connected respectively with the Section Point and first power supply, and has the third electrode that is connected with second launch-control line.

10. active display according to claim 9,

Wherein said first on-off circuit comprises the 7th transistor, and it has respectively first and second electrodes that are connected with an OLED with first node, and have the third electrode that is connected with first launch-control line and

Wherein said second switch circuit comprises the 8th transistor, and it has respectively first and second electrodes that are connected with the 2nd OLED with first node, and has the third electrode that is connected with second launch-control line.

11. active display according to claim 9, wherein said initializing signal line is given among first and second OLED at least one with the voltage transmission that applied.

12. active display according to claim 9, wherein said initializing signal line is connected with second sweep trace, and described second sweep trace is before first sweep trace.

13. active display according to claim 9, the light of wherein said first and second OLED emission same color.

14. an active display comprises

Wherein said pixel comprises:

First and second Organic Light Emitting Diodes, i.e. OLED is placed on to be connected with the operation according to on-off circuit on two different rows of image-display units and with on-off circuit and comes received current and luminous,

Wherein said driving circuit comprises:

Transistor seconds has respectively first and second electrodes that are connected with first node with data line, and has the third electrode that is connected with first sweep trace;

The 3rd transistor has respectively and second first and second electrodes that are connected with the 3rd node, and has the third electrode that is connected with first sweep trace;

15. active display according to claim 14,

16. active display according to claim 14, wherein said initializing signal line is given among first and second OLED at least one with the voltage transmission that applied.

17. active display according to claim 14, wherein said initializing signal line is connected with second sweep trace, and described sweep trace is before first sweep trace.

18. active display according to claim 14, the light of wherein said first and second OLED emission same color.

19. a pixel comprises:

First, second, third and having ideals, morality, culture, and discipline OLED, i.e. OLED;

Driving circuit is connected to drive the first, second, third and the 4th OLED with the 4th OLED with first, second, third publicly; With

On-off circuit is connected between the first, second, third and the 4th OLED and the driving circuit sequentially controlling the driving of the first, second, third and the 4th OLED,

Wherein said driving circuit comprises:

The first transistor, being used to receive first power of first power supply and being used for basis first voltage corresponding with data-signal provides electric current;

Transistor seconds is used to receive first sweep signal optionally data-signal is imposed on the first transistor;

Capacitor is used for first store voltages, one preset time;

The 3rd transistor is used to receive first sweep signal optionally to connect the first transistor to work in the diode mode;

The 4th transistor is used for optionally applying initializing signal with the initialization capacitor according to second sweep signal;

The 5th transistor is used for coming optionally first power of first power supply is imposed on the first transistor according to first emissioning controling signal;

The 6th transistor is used for coming optionally first power of first power supply is imposed on the first transistor according to second emissioning controling signal;

The 7th transistor is used for coming optionally first power of first power supply is imposed on the first transistor according to the 3rd emissioning controling signal; With

The 8th transistor is used for coming optionally first power of first power supply is imposed on the first transistor according to the 4th emissioning controling signal.

20. pixel according to claim 19, wherein said on-off circuit comprises:

First on-off circuit is used for optionally applying electric current according to first and second emissioning controling signals; With

The second switch circuit is used for optionally providing electric current according to third and fourth emissioning controling signal.

21. pixel according to claim 19,

Wherein the first, second, third and the 4th emissioning controling signal is the cyclical signal with the first, second, third and the 4th time period,

Wherein first in first and second time periods, keep different voltage levels and in third and fourth time period, carry out repetition with identical voltage level with the 3rd emissioning controling signal, and

Wherein second carries out repetition and keep different voltage levels in third and fourth time period with identical voltage level in first and second time periods with the 4th emissioning controling signal.

22. pixel according to claim 20, wherein said first on-off circuit comprises:

The 9th transistor is used for coming optionally electric current to be imposed on an OLED according to first emissioning controling signal; With

The tenth transistor is used for coming optionally electric current to be imposed on the 2nd OLED according to second emissioning controling signal; With

Wherein said second switch circuit comprises:

The 11 transistor is used for coming optionally electric current to be imposed on the 3rd OLED according to the 3rd emissioning controling signal; With

The tenth two-transistor is used for coming optionally electric current to be imposed on the 4th OLED according to the 4th emissioning controling signal.

23. pixel according to claim 19, wherein said initializing signal are second sweep signals.

24. pixel according to claim 19, wherein initializing signal is the voltage that is applied to when not having electric current to flow through the first, second, third and the 4th OLED at least one of the first, second, third and the 4th OLED.

25. an active display comprises:

Image-display units, it comprises a plurality of pixels;

The data-driven parts are used for data signal transmission to pixel; With

Scanner driver is used for sweep signal and emissioning controling signal are transferred to pixel,

Wherein each described pixel comprises:

Driving circuit jointly is connected to drive the first, second, third and the 4th OLED with the 4th OLED with first, second, third; With

Wherein said driving circuit comprises:

Transistor seconds is used to receive first sweep signal of sweep signal optionally data-signal is imposed on the first transistor;

Capacitor is used for first store voltages, one preset time;

The 3rd transistor is used to receive first sweep signal and works in the diode mode optionally to connect the first transistor;

The 4th transistor is used for optionally applying initializing signal with the initialization capacitor according to second sweep signal of sweep signal;

The 5th transistor is used for first emissioning controling signal according to emissioning controling signal and comes optionally first power of first power supply is imposed on the first transistor;

The 6th transistor is used for second emissioning controling signal according to emissioning controling signal and comes optionally first power of first power supply is imposed on the first transistor;

The 7th transistor is used for the 3rd emissioning controling signal according to emissioning controling signal and comes optionally first power of first power supply is imposed on the first transistor; With

The 8th transistor is used for the 4th emissioning controling signal according to emissioning controling signal and comes optionally first power of first power supply is imposed on the first transistor.

26. active display according to claim 25, wherein said on-off circuit comprises:

The second switch circuit is used for optionally applying electric current according to third and fourth emissioning controling signal.

27. active display according to claim 26, wherein said first on-off circuit comprises:

Wherein said second switch circuit comprises:

28. active display according to claim 25, wherein, in a plurality of described pixels, adjacent one another are and receive in first pixel and second pixel of at least one data-signal by an identical data line, the shooting sequence of first and second OLED of first pixel is different with the shooting sequence of first and second OLED of second pixel, and the shooting sequence of third and fourth OLED of first pixel is different with the sequence of light of third and fourth OLED of second pixel.

29. active display according to claim 25 wherein is transferred to second sweep signal sweep trace before another sweep trace that is transferred in first sweep signal.

30. active display according to claim 25, data driver two data-signals of outputting data signals sequentially wherein, described two data-signals have the information about different colours.