CN101075410B - Image display system and method for driving display assembly - Google Patents
Image display system and method for driving display assembly Download PDFInfo
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- CN101075410B CN101075410B CN2007101075289A CN200710107528A CN101075410B CN 101075410 B CN101075410 B CN 101075410B CN 2007101075289 A CN2007101075289 A CN 2007101075289A CN 200710107528 A CN200710107528 A CN 200710107528A CN 101075410 B CN101075410 B CN 101075410B
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Abstract
A pixel driving circuit is prepared as arranging the first and the second nodes on storage capacity, setting grid on transistor and coupling said transistor between two said nodes, coupling shift circuit to the first node for transmitting data signal to the first node, coupling switch circuit to driving component and the first display component as well as the second display component for making said driving component be on diode-coupled at loading time intervals of the first data and the second data.
Description
Technical field
The present invention relates to a kind of pixel-driving circuit, particularly relate to the pixel-driving circuit that can compensate threshold voltage and power supply supply.
Background technology
Organic Light Emitting Diode (organic light-emitting diodes; OLEDs) display is the flat-panel screens that adopts organic compound can emit beam as luminescent material, advantages such as organic light emitting diode display has that volume is little, in light weight, visual range wide, high contrast and high reaction velocity.
Active matric Organic Light Emitting Diode (Active Matrix OLED; AMOLED) display is a flat-panel screens of new generation; Compare with active matrix type liquid crystal display; The active matric organic light emitting diode display has many advantages; For example: higher contrast, the visual angle of broad, do not need backlight and thin module thickness, lower power consumption and lower cost are arranged, active matrix type liquid crystal display is by driven, and the active matric organic light emitting diode display need drive electroluminescence part by current source; The brightness of electroluminescence part is proportional to the electric current that is passed through; The variation of the magnitude of current of electroluminescence part of flowing through has negative influence for the luminance uniformity of active matric organic light emitting diode display, and therefore, the quality of pixel-driving circuit is extremely important for the image quality of active matric organic light emitting diode display.
Fig. 1 shows the pixel-driving circuit 10 of a traditional active matric organic light emitting diode display, and pixel-driving circuit 10 has transistor Mx and My, electroluminescence part EL and capacitor C st.When signal Scan conducting one transistor Mx, can be loaded the grid of a P transistor npn npn My with the data shown in the Vdata among the figure, and be stored in the capacitor C st; Therefore; It is luminous to have a fixing current drives electroluminescence part EL, and in typical active matric organic light emitting diode display, current source is a P type thin film transistor (TFT) (like the My among Fig. 1) normally; Grid is controlled by a data-signal Vdata; And drain electrode and source electrode are connected to power supply Vdd and electroluminescence part EL respectively, and be as shown in Figure 1, and the brightness of electroluminescence part EL has following relation with respect to Vdata:
Brightness ∝ electric current ∝ (Vdd-Vdata-Vth)
2
Wherein, Vth is the threshold voltage of transistor My, and Vdd is a power supply supply voltage.Because in low temperature polycrystalline silicon technology; Low-temperature polysilicon film transistor has the variation of threshold voltage vt h usually, if threshold voltage vt h does not pass through suitable compensation, the active matric organic light emitting diode display just has uneven phenomenon and produces; Moreover; Pressure drop on power lead also can produce the problem of brightness irregularities, and in order to address this problem, construction is once compensating the important topic that threshold voltage vt h and the image element circuit of power supply supply Vdd have become to improve image quality.
Summary of the invention
In view of this, the present invention provides a kind of pixel-driving circuit.Pixel-driving circuit comprises a storage capacitors, a transistor, a carry circuit, a driven unit and an on-off circuit.Storage capacitors has first node and Section Point.Transistor have a grid that receives discharge signal and be coupled to first node and Section Point between, wherein discharge signal makes transistor turns make the storage capacitors discharge in the first discharge period and the second discharge period.Carry circuit couples the first node of storage capacitors and a data-signal or a reference signal is sent to the first node of storage capacitors.Driven unit has first end points that couples first level, the 3rd end points that couples second end points of Section Point and have output one drive current.On-off circuit couples driven unit, first display module and second display module and can make driven unit become diode to couple in the first data load period and the second data load period, and on-off circuit also can make drive current export first display module and second display module respectively in the first luminous period and the second luminous period.
According to an aspect of the present invention, a kind of image display system is provided, comprises a kind of pixel-driving circuit.This pixel-driving circuit comprises: a storage capacitors has a first node and a Section Point; One transistor; Have a grid that is coupled to a discharge signal, a drain electrode that is coupled to above-mentioned first node and the one source pole that couples with above-mentioned Section Point, wherein above-mentioned discharge signal makes above-mentioned transistor turns so that the discharge of above-mentioned storage capacitors in one first period; One carry circuit is coupled to the first node of above-mentioned storage capacitors, and above-mentioned carry circuit is sent to one of a data-signal and a reference signal first node of above-mentioned storage capacitors; One driven unit has one first end points that is coupled to one first level, is coupled to one second end points of above-mentioned Section Point, and has one the 3rd end points of output one drive current; And an on-off circuit, be coupled between an above-mentioned driven unit and the display module, and can in one second period, make above-mentioned driven unit become diode to couple, and make above-mentioned drive current in one the 3rd period, to export above-mentioned display module to.
According to another aspect of the present invention, a kind of image display system is provided, comprises a kind of pixel-driving circuit.This pixel-driving circuit comprises: a storage capacitors has a first node and a Section Point; One transistor; Have a grid that receives a discharge signal, a drain electrode that is coupled to above-mentioned first node and the one source pole that couples with above-mentioned Section Point, wherein above-mentioned discharge signal is in one first discharge period and one second discharge period made above-mentioned transistor turns so that the discharge of above-mentioned storage capacitors; One carry circuit is coupled to the first node of above-mentioned storage capacitors, and above-mentioned carry circuit is sent to one of a data-signal and a reference signal first node of above-mentioned storage capacitors; One driven unit has one first end points that is coupled to one first level, one the 3rd end points that is coupled to one second end points of above-mentioned Section Point and has output one drive current; An and on-off circuit; Be coupled to above-mentioned driven unit, one first display module and one second display module; And make above-mentioned driven unit become diode to couple, and make above-mentioned drive current in one first luminous period and one second luminous period, export above-mentioned first display module and above-mentioned second display module respectively in one first data load period and one second data load period.
Description of drawings
Fig. 1 shows the pixel-driving circuit of a traditional active matric organic light emitting diode display.
Fig. 2 shows according to one embodiment of the invention and discloses a pixel-driving circuit figure.
The sequential chart of luminous signal, discharge signal, scanning-line signal and the horizontal clock signal of Fig. 3 display pixel driving circuit.
Fig. 4 display panel through horizontal clock signal respectively with data load in red, green and blue three signal wires.
Fig. 5 shows according to another embodiment of the present invention and discloses a pixel-driving circuit figure.
The sequential chart of the luminous signal of Fig. 6 display pixel driving circuit, discharge signal, scanning-line signal, counter-scanning line signal and horizontal clock signal.
Fig. 7 shows image display system according to another embodiment of the present invention.
Fig. 8 shows according to one embodiment of the invention and discloses a pixel-driving circuit.
Fig. 9 shows the sequential chart of the frame signal, discharge signal, scanning-line signal and the luminous signal that disclose according to one embodiment of the invention.
Figure 10 shows image display system according to another embodiment of the present invention.
The reference numeral explanation
Vdd～power supply
Cst～storage capacitors
Scan～scanning-line signal
Scanx～counter-scanning line signal
Vdata～data-signal
PVdd～power supply supply
Vref～reference signal
Vth～threshold voltage
Discharge～discharge signal
Emi, Emi1～luminous signal
210,510,810～carry circuit
220,520,820～on-off circuit
R, G, B～signal wire
SW1, SW2, SW3～switch
10,200,500～pixel-driving circuit
CKH1, CKH2, CKH 3～horizontal clock signal
M1, M2, M3, M4, M5, M6, M7, Mx, My～transistor
Row1, row2, roWn～row 1, row 2, row n
400～display panel
500～power supply unit
600～electronic installation
850～driving circuit
EL, EL1, EL2～display module
Emit_1, Emit_2～luminous signal
FRAME～frame signal
S1, S4～discharge period
S2, S5～data load period
S3, S6～luminous period
SF～frame period
SF1, SF2～inferior frame period
Embodiment
For letting above and other objects of the present invention, characteristic and the advantage can be more obviously understandable, the hereinafter spy enumerates preferred embodiment, and is described with reference to the accompanying drawings as follows:
Fig. 2 shows according to first embodiment of the invention and discloses a pixel-driving circuit 200, and pixel-driving circuit 200 has compensation threshold voltage, offset supply supply, can not be subject to the characteristic of the voltage of scanning-line signal Scan with the voltage of power supply supply PVdd.Pixel-driving circuit 200 comprises a storage capacitors Cst, a carry circuit 210, a driving transistors M5, transistor M6 and an on-off circuit 220.
When scanning-line signal Scan was pulled to high level, carry circuit 210 was passed to a data-signal Vdata first node A of storage capacitors Cst; When scanning-line signal Scan was pulled to low level, carry circuit 210 was passed to reference signal Vref this first node A of storage capacitors Cst.
On-off circuit 220 comprises the 3rd transistor M3 and the 4th transistor M4; As shown in Figure 2; The 3rd transistor M3 can be PMOS, and the 4th transistor M4 can be nmos pass transistor, and the drain electrode of the 3rd transistor M3 is connected to the anode of display module EL; The grid of transistor M3 and source electrode are connected to a luminous signal Emi and driving transistors M5 respectively; The 4th transistor M4 has one source pole and is coupled to driving transistors M5 and the 3rd transistor M3, and the drain electrode of the 4th transistor M4 is coupled to the Section Point B of storage capacitors Cst, the source electrode of a transistor M6 and the grid of driving transistors M5, and the grid of the 4th transistor M4 is connected to one scan line signal Scan.Preferable, the 3rd transistor M3 and the 4th transistor M4 are polycrystalline SiTFT, and higher current driving ability can be provided.
When scanning-line signal Scan was pulled to high level, the 4th transistor M4 in the on-off circuit 220 can make driving transistors M5 become the transistor that a diode connects (diode-connected).
The drain electrode of transistor M6 is coupled to the first node A of storage capacitors Cst; The grid of transistor M6 is coupled to a discharge signal Discharge, and the source electrode of transistor M6 is coupled to the Section Point B of storage capacitors Cst, the drain electrode of the 4th transistor M4 and the grid of driving transistors M5.
Fig. 3 shows the sequential chart of luminous signal Emi, discharge signal Discharge, scanning-line signal Scan and horizontal clock signal C KH1, CKH2 and the CKH3 of pixel-driving circuit shown in Figure 2 200.Follow the last light-emitting mode of pixel-driving circuit; When discharge signal Discharge is pulled to high level and luminous signal Emi and maintains high level; Pixel-driving circuit 200 in Fig. 2 can operate in a discharge mode S1; In this discharge mode, transistor M6 meeting conducting, the reference signal Vref of a high level can be input to first node A and the Section Point B of storage capacitors Cst; The electric charge that is stored in the storage capacitors Cst just can discharge in discharge mode, and the discharge of storage capacitors Cst can be guaranteed the normal running in subsequent step.
After the discharge of the storage capacitors that continues Cst, scanning-line signal Scan is pulled to high level, and pixel-driving circuit 200 can get into data load Mode S 2 then; When scanning-line signal Scan is pulled to high level; The first transistor M1 and the 4th transistor M4 conducting and transistor seconds M2 and transistor M6 close, because the first transistor M1 and the 4th transistor M4 conducting, the voltage of the first node A of storage capacitors Cst equals the voltage of data-signal Vdata; And the voltage of the Section Point B of storage capacitors Cst equals PVdd-Vth; Wherein, Vth is the threshold voltage of driving transistors M5, and the cross-pressure that therefore is stored in storage capacitors is Vdata-(PVdd-Vth).
When scanning-line signal Scan was pulled to low level, data load Mode S 2 finished.When luminous signal Emi was pulled to low level, pixel-driving circuit 200 can get into light-emitting mode S3.And because scanning-line signal Scan is in low level; Transistor seconds M2 conducting; The voltage of the first node A of storage capacitors Cst is reference voltage Vref; Because the cross-pressure of storage capacitors can't change moment, so the voltage of the Section Point B of storage capacitors Cst also just becomes Vref-[Vdata-(PVdd-Vth)], and the electric current of the display module of flowing through is proportional to (Vsg-Vth)
2, just be proportional to (Vdata-Vref)
2, the power supply supply PVdd of the electric current of the display module EL that therefore flows through and the threshold voltage vt h of driving transistors M5 and driving transistors M5 is irrelevant, and the operation meeting of above-mentioned pixel-driving circuit repeats again and again, to control the luminous of pixel.
Fig. 4 show active matrix type organic light-emitting diode display panel through horizontal clock signal C KH1, CKH2 and CKH 3 respectively with the red R of data load, green G and blue B three signal wires.When scanning-line signal Scan respectively at row 1, row 2 or row n (row1; Row2; Rown) during high level; Just when the data load pattern, S2 distinguishes in regular turn with switch SW 1, SW2 and SW3 conducting through horizontal clock signal C KH1, CKH2 and CKH3, and in regular turn data is written on red R, green G and blue B three signal wires.
Fig. 5 shows according to another embodiment of the present invention and discloses a pixel-driving circuit 500, and pixel-driving circuit 500 also has compensation threshold voltage, offset supply supply, can not be subject to the characteristic of the voltage of scanning-line signal Scan with the voltage of power supply supply PVdd.Pixel-driving circuit 500 is similar with pixel-driving circuit 200.Fig. 2 pixel-driving circuit 200 and Fig. 5 pixel-driving circuit 500 different be in; The transistor M7 of Fig. 5 and transistor M8 are nmos pass transistor; And the transistor seconds M2 of Fig. 2 and the 3rd transistor M3 are the PMOS transistor, and the grid of the transistor M7 of Fig. 5 is coupled to a counter-scanning line signal ScanX.Counter-scanning line signal ScanX is the inversion signal of scanning-line signal Scan.
Fig. 6 shows the sequential chart of luminous signal Emi1, discharge signal Discharge, scanning-line signal Scan, counter-scanning line signal ScanX and horizontal clock signal C KH1, CKH2 and the CKH3 of pixel-driving circuit shown in Figure 5 500.Follow the last light-emitting mode of pixel-driving circuit; When discharge signal Discharge is pulled to high level and luminous signal Emi1 and maintains low level; Pixel-driving circuit 500 in Fig. 5 can operate in a discharge mode S1; In this discharge mode, transistor M6 meeting conducting, the reference signal Vref of a high level can be input to first node A and the Section Point B of storage capacitors Cst; The electric charge that is stored in the storage capacitors Cst just can discharge in discharge mode, and the discharge of storage capacitors Cst can be guaranteed the normal running in subsequent step.
Fig. 7 shows image display system according to another embodiment of the present invention; In the present embodiment; Image display system can comprise display panel 400 or electronic installation 600; Display panel 400 as shown in Figure 7 comprises the pixel-driving circuit 2 00 of above-mentioned Fig. 2; Display panel 4 00 can be that (for example: electronic installation 600), general electronic installation 600 comprises display panel 400 and power supply unit 500, very a person for the part of electronic installation; Power supply unit 500 is coupled to display panel 400 so that electric energy to display panel 400 to be provided, and electronic installation can be: mobile phone, digital camera, personal digital assistant, mobile computer, desktop PC, TV or portable DVD player projector.
The principle of work of Fig. 5 is also roughly the same with the principle of work of Fig. 2.Therefore, the flow through electric current of display module EL of Fig. 5 is proportional to (Vsg-Vth)
2, also be proportional to (Vdata-Vref)
2, the power supply supply PVdd of the electric current of the display module EL of the Fig. 5 that therefore flows through and the threshold voltage vt h of driving transistors M5 and driving transistors M5 is irrelevant, and the operation meeting of above-mentioned pixel-driving circuit repeats again and again, to control the luminous of pixel.
The pixel-driving circuit 200 of the embodiment of the invention and 500 and the threshold voltage vt h of driving transistors M5 and power supply supply PVdd irrelevant; And the voltage level of power supply supply PVdd and scanning-line signal Scan is not have connection mutually; Therefore the voltage range value of scanning-line signal Scan can't receive the restriction of power supply supply PVdd voltage range value, and vice versa.
Because the pixel of display panel is more and more, and in order to make display panel color colour gamut wider, the slip-stick artist generally can put into the luminescence unit of more different colours to increase the pixel and the colour gamut of display panel in display panel.The tradition luminescence unit comprises an electroluminescence part and corresponding driving circuit; Because driving circuit can't be luminous; Therefore the shared area of driving circuit is little; Make the aperture of luminescence unit can be bigger, therefore how in the display panel of fixed measure, to put into less driving circuit and more electroluminescence part is an emphasis of the present invention than (Apertureratio).
Fig. 8 shows according to one embodiment of the invention and discloses a pixel-driving circuit 8 00; Pixel-driving circuit 800 is for the circuit design of 5T1C+2T and have the compensation threshold voltage and the ability of offset supply supply, and the voltage of power supply supply PVdd can not be subject to the voltage of scanning-line signal Scan in addition.Pixel-driving circuit 800 comprises storage capacitors Cst, carry circuit 810, driving transistors M5, transistor M6, on-off circuit 820 and display module EL1 and EL2.Display module EL1 and EL2 can be electroluminescence part and share driving circuit 850 reducing the area of the shared pixel-driving circuit 200 of driving circuit, so display module EL1 and EL2 use driving circuit 850 respectively at inferior frame SF1 in period and SF2.
Carry circuit 810 is coupled to the first node A of storage capacitors Cst, and data-signal Vdata or reference signal Vref are transferred on the first node A of storage capacitors, and reference signal Vref can be a fixed voltage signal.Driving transistors M5 can be P-type mos (P-Channel MetalOxide Semiconductor, PMOS), the source electrode of driving transistors M7 is coupled to power supply supply PVdd, power supply supply PVdd is a direct current.The grid of driving transistors M5 is coupled to the Section Point B of storage capacitors Cst.On-off circuit 820 is coupled to the drain electrode of driving transistors M5 and can makes driving transistors M5 become diode to connect (diode-connected).Display module EL1 and EL2 are coupled to the transistor M3 and the transistor M7 of on-off circuit 820 respectively.In addition, the negative electrode of display module EL1 and EL2 is coupled to one second level, and second level can be an earth level or a fixed voltage VSS.
Carry circuit 810 comprises the first transistor M1 and transistor seconds M2.In Fig. 2, the first transistor M1 and transistor seconds M2 are respectively N type metal oxide semiconductor (N-Channel MetalOxide Semiconductor, NMOS) transistor AND gate PMOS transistor.The drain and gate of the first transistor M1 receives data-signal Vdata and scanning-line signal Scan respectively, and the source electrode of the first transistor M1 couples the first node A of storage capacitors Cst.The source electrode of transistor seconds M2 and grid receive reference signal Vref and scanning-line signal Scan respectively, and the drain electrode of transistor seconds M2 also couples the first node A of storage capacitors Cst.In addition, the first transistor M1 and transistor seconds M2 can be polycrystalline SiTFT so that higher current driving ability to be provided.
When scanning-line signal Scan is pulled to high level; Carry circuit 810 is passed to data-signal Vdata the first node A of storage capacitors Cst; When scanning-line signal Scan was pulled to low level, carry circuit 810 was passed to reference signal Vref this first node A of storage capacitors Cs t.
On-off circuit 820 comprises transistor M3, transistor M4 and transistor M7; Wherein transistor M3 and transistor M7 can be PMOS or NMOS; Transistor M4 can be nmos pass transistor; The drain electrode of transistor M3 and transistor M7 is connected to the anode of display module EL1 and EL2 respectively, and the grid of transistor M3 receives luminous signal Emit_1, and the grid of transistor M7 receives luminous signal Emit_2; The source electrode of transistor M3 and M7 all couples driving transistors M5; Transistor M4 has one source pole and is coupled to driving transistors M5, transistor M3 and transistor M7, and the drain electrode of transistor M4 is coupled to the Section Point B of storage capacitors Cs t, the source electrode of transistor M6 and the grid of driving transistors M5, the grid received scanline signal Scan of transistor M4.According to one embodiment of the invention, transistor M3 and transistor M7 are that polycrystalline SiTFT is to provide higher current driving ability.When scanning-line signal Scan is pulled to high level; Transistor M4 in the on-off circuit 820 can make driving transistors M5 become the transistor that diode connects (diode-connected); Just driving transistors M7 grid and drain short circuit, driving transistors M5 can regard a diode as.
The drain electrode of transistor M6 is coupled to the first node A of storage capacitors Cst; The grid of transistor M6 receives a discharge signal Discharge, and the source electrode of transistor M6 is coupled to the Section Point B of storage capacitors Cst, the drain electrode of transistor M4 and the grid of driving transistors M5.
Fig. 9 shows the sequential chart of the frame signal FRAME, discharge signal Discharge, scanning-line signal Scan and luminous signal Emit_1 and the Emit_2 that disclose according to one embodiment of the invention.It is time frame SF1 in period or inferior frame SF2 in period at present that 200 of pixel-driving circuits determine according to frame signal FRAME, and an other whole frame SF in period comprises time frame SF1 in period and SF2.When inferior frame SF1 in period; When discharge signal Discharge is pulled to high level and luminous signal Emit_1 and maintains high-voltage level; Pixel-driving circuit 200 can operate in a discharge S1 in period, and is interim when this discharges, transistor M6 meeting conducting; Because scanning-line signal Scan is a low voltage level; Reference signal Vref can be input to first node A and the Section Point B of storage capacitors Cst, and the electric charge that is stored in the storage capacitors Cst just can interim release when discharge, and the discharge of storage capacitors Cst can be guaranteed the normal running at subsequent step.
After the storage capacitors that the continues Cst discharge, scanning-line signal Scan is pulled to high-voltage level, and pixel-driving circuit 200 can get into data load S2 in period then; When scanning-line signal Scan is pulled to high-voltage level; Transistor M1 and transistor M4 conducting and transistor M2 and transistor M6 close, because transistor M1 and transistor M4 conducting, the voltage of the first node A of storage capacitors Cst equals the voltage of data-signal Vdata; And the voltage of the Section Point B of storage capacitors Cst equals (PVdd-Vth); Wherein, Vth is the threshold voltage of driving transistors M5, and therefore the cross-pressure of storage capacitors is Vdata-(PVdd-Vth) at this moment.
When scanning-line signal Scan was pulled to low voltage level, data load S2 in period finished.When luminous signal Emit_1 was pulled to low voltage level, pixel-driving circuit 200 can entering S3 in luminous period.And because scanning-line signal Scan is at low voltage level; Transistor M2 conducting; The voltage transition of the first node A of storage capacitors Cst is a reference voltage Vref; Because the cross-pressure of storage capacitors can't change moment, so the voltage of the Section Point B of storage capacitors Cst also just becomes Vref-[Vdata-(PVdd-Vth)], and the electric current of flow through display module EL1 and EL2 is proportional to (Vsg-Vth)
2, just be proportional to (Vdata-Vref)
2, therefore at inferior frame SF1 in period, the electric current of the display module EL1 that flows through and the threshold voltage vt h of driving transistors M5 and power supply supply PVdd are irrelevant.
When inferior frame SF2 in period, luminous signal Emit_1 keeps high-voltage level, and discharge signal Discharge, scanning-line signal Scan and luminous signal Emit_2 repeat the light-emitting procedure of above-mentioned frame SF1 in period.When discharge signal Discharge is pulled to high-voltage level and luminous signal Emit_2 and maintains high-voltage level; Pixel-driving circuit 800 in Fig. 8 can operate in discharge S4 in period; Storage capacitors Cst discharge, Scan is pulled to high-voltage level when scanning-line signal, and pixel-driving circuit 800 can get into data load S5 in period; When scanning-line signal Scan was pulled to low voltage level again, data load S5 in period finished.When luminous signal Emit_2 is pulled to low voltage level; Pixel-driving circuit 800 meeting entering S6 in luminous period; Other luminescent method is identical with time frame SF1 in period with principle; Therefore at inferior frame SF2 in period, PVdd is irrelevant for the supply of the power supply of the electric current of the display module EL2 that flows through and the threshold voltage vt h of driving transistors M5 and driving transistors M5.In addition, as shown in Figure 9 according to one embodiment of the invention, discharge period S1, data load S2 in period, luminous period S3, discharge S4 in period, data load S5 in period, luminous period, S6 took place in regular turn.
The pixel-driving circuit 800 of the embodiment of the invention is irrelevant with the threshold voltage vt h of driving transistors M5 and power supply supply PVdd; And the voltage level of power supply supply PVdd and scanning-line signal Scan is not have connection mutually; Therefore the voltage range value of scanning-line signal Scan can't receive the restriction of power supply supply PVdd voltage range value, and display module EL1 shares driving circuit 850 with the display module EL1 of increase pixel-driving circuit 800 and the light-emitting area of EL2 with EL2.
Figure 10 shows image display system according to another embodiment of the present invention; In the present embodiment; Image display system can comprise display panel 400 or electronic installation 600; Display panel 400 shown in figure 10 comprises the pixel-driving circuit 800 of above-mentioned Fig. 8; Display panel 400 can be that (for example: electronic installation 600), general electronic installation 600 comprises display panel 400 and power supply unit 500, in addition for the part of electronic installation; Power supply unit 500 is coupled to display panel 400 so that electric energy to display panel 400 to be provided, and electronic installation can be: mobile phone, digital camera, personal digital assistant, mobile computer, desktop PC, TV or portable DVD player projector.
Though the present invention discloses as above with preferred embodiment; But it is not in order to limiting scope of the present invention, those skilled in the art, under the premise without departing from the spirit and scope of the present invention; Can do some changes and modification, so protection scope of the present invention is as the criterion with the application's claim.
Claims (11)
1. image display system comprises:
A kind of pixel-driving circuit comprises:
One storage capacitors has a first node and a Section Point;
One transistor; Have a grid that is coupled to a discharge signal, a drain electrode that is coupled to above-mentioned first node and the one source pole that couples with above-mentioned Section Point, wherein above-mentioned discharge signal makes above-mentioned transistor turns so that the discharge of above-mentioned storage capacitors in one first period;
One carry circuit is coupled to the first node of above-mentioned storage capacitors, and above-mentioned carry circuit is sent to one of a data-signal and a reference signal first node of above-mentioned storage capacitors;
One driven unit has one first end points that is coupled to one first level, is coupled to one second end points of above-mentioned Section Point, and has one the 3rd end points of output one drive current; And
One on-off circuit is coupled between an above-mentioned driven unit and the display module, and can in one second period, make above-mentioned driven unit become diode to couple, and makes above-mentioned drive current in one the 3rd period, to export above-mentioned display module to.
2. image display system as claimed in claim 1, wherein above-mentioned carry circuit comprises:
One the first transistor has a grid and is coupled to one first sweep trace, has a drain electrode and receives above-mentioned data-signal, and have one source pole and be coupled to above-mentioned first node; And
One transistor seconds has a grid and is coupled to above-mentioned first sweep trace, has one source pole and receives above-mentioned reference signal, and have a drain electrode and be coupled to above-mentioned first node.
3. image display system as claimed in claim 1, wherein above-mentioned carry circuit comprises:
One the first transistor has a grid and is coupled to one first sweep trace, has a drain electrode and receives above-mentioned data-signal, and have one source pole and be coupled to above-mentioned first node; And
One transistor seconds has a grid and is coupled to one second sweep trace, has one source pole and receives above-mentioned reference signal, and have a drain electrode and be coupled to above-mentioned first node.
4. image display system as claimed in claim 1, said switching circuit comprises:
One the 3rd transistor has a grid that is coupled to a luminous signal line, has a drain electrode that is coupled to above-mentioned display module, and has the one source pole that is coupled to above-mentioned driven unit; And
One the 4th transistor has a drain electrode that is coupled to above-mentioned Section Point, has a grid that is coupled to one first sweep trace, and has the one source pole that is coupled to above-mentioned driven unit.
5. image display system comprises:
A kind of pixel-driving circuit comprises:
One storage capacitors has a first node and a Section Point;
One transistor; Have a grid that receives a discharge signal, a drain electrode that is coupled to above-mentioned first node and the one source pole that couples with above-mentioned Section Point, wherein above-mentioned discharge signal is in one first discharge period and one second discharge period made above-mentioned transistor turns so that the discharge of above-mentioned storage capacitors;
One carry circuit is coupled to the first node of above-mentioned storage capacitors, and above-mentioned carry circuit is sent to one of a data-signal and a reference signal first node of above-mentioned storage capacitors;
One driven unit has one first end points that is coupled to one first level, one the 3rd end points that is coupled to one second end points of above-mentioned Section Point and has output one drive current; And
One on-off circuit; Be coupled to above-mentioned driven unit, one first display module and one second display module; And make above-mentioned driven unit become diode to couple, and make above-mentioned drive current in one first luminous period and one second luminous period, export above-mentioned first display module and above-mentioned second display module respectively in one first data load period and one second data load period.
6. image display system as claimed in claim 5, wherein above-mentioned first display module and above-mentioned second display module are shared above-mentioned driven unit, above-mentioned carry circuit, above-mentioned storage capacitors and above-mentioned transistor.
7. image display system as claimed in claim 6, wherein above-mentioned first display module is luminous in the above-mentioned second luminous period in luminous and above-mentioned second display module of the above-mentioned first luminous period.
8. image display system as claimed in claim 5, wherein above-mentioned second end points of above-mentioned driven unit and above-mentioned the 3rd end points link together in the above-mentioned first data load period and the above-mentioned second data load period and make above-mentioned driven unit become above-mentioned diode to couple.
9. image display system as claimed in claim 5, wherein above-mentioned drive current be proportional in the above-mentioned first luminous period and the above-mentioned second luminous period above-mentioned data-signal and above-mentioned reference signal difference square.
10. image display system as claimed in claim 5, wherein above-mentioned carry circuit comprises:
One the first transistor has the grid that receives one first sweep signal, receives a drain electrode of above-mentioned data-signal and couples the one source pole of above-mentioned first node; And
One transistor seconds has the grid that receives above-mentioned first sweep signal, receives the one source pole of above-mentioned reference signal and couples a drain electrode of above-mentioned first node.
11. image display system as claimed in claim 5, wherein said switching circuit comprises:
One the 3rd transistor has the grid that receives one first luminous signal, couples the drain electrode of above-mentioned first display module and couples the source electrode of above-mentioned driven unit;
One the 4th transistor has the grid that couples one first sweep signal, couples the drain electrode of above-mentioned Section Point and couples the source electrode of above-mentioned driven unit; And
One the 5th transistor has the grid that receives one second luminous signal, couples the drain electrode of above-mentioned second display module and couples the source electrode of above-mentioned driven unit.
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