Description of drawings
Figure 1A is the synoptic diagram of display system.
Figure 1B is the relation between grid impulse GP and the pixel electrode signal.
Fig. 2 is the synoptic diagram of display system of the present invention.
Fig. 3 is that one of gate drivers of the present invention maybe embodiment.
Fig. 4 A is that one of snubber assembly of the present invention maybe embodiment.
Fig. 4 B is output signal S of the present invention
OUTSynoptic diagram.
Fig. 4 C is another possibility embodiment of output signal of the present invention.
[main element symbol description]
100,200: display system; 110,210: gate drivers;
131: gate line; 230: source electrode driver;
310: shift LD device; 330: level shifting apparatus;
350: snubber assembly; 410: go up the drawing-die piece;
430: drop-down module; 421: the rising edge edge;
422,423,441~443c: sloping portion;
P
121~P
12n, P
11~P
Mn: pixel cell;
SW1~SW3: switch element.
Embodiment
Fig. 2 is the synoptic diagram of display system of the present invention.The present invention is the kind of limit display system 200 not.Display system 200 can be PDA(Personal Digital Assistant), mobile phone (cellular phone), digital camera, TV, GPS (GPS), automobile-used display, aviation with display, digital frame (digital photo frame), mobile computer or desktop PC.In the present embodiment, display system 200 comprises, gate drivers (gate driver) 210, source electrode driver (source driver) 230 and pixel cell P
11~P
Mn
Gate drivers 210 provides sweep signal S1~S-n.Source electrode driver 230 provides data-signal D1~Dm.Pixel cell P
11~P
MnAccording to sweep signal S1~S-n, receive data-signal D1~Dm, and, present corresponding picture according to data-signal D1~Dm.
Fig. 3 is that one of gate drivers of the present invention maybe embodiment.As shown in the figure, gate drivers 210 comprises, shift LD device (shift register) 310, level shifting apparatus (level shifter) 330 and snubber assembly (buffer) 350.
Shift LD device 310 produces shift signal S according to opening beginning signal CLK
SR1~S
SRn Level shifting apparatus 330 changes shift signal S
SR1~S
SRnLevel, and produce switching signal S
LS1~S
LSnSnubber assembly 350 increases switching signal S
LS1~S
LSnDriving force, and produce output signal S
OUT1~S
OUTnIn the present embodiment, output signal S
OUT1~S
OUTnTrailing edge along all having at least two different descending slopes.
Because shift LD device 310 produces shift signal S
SR1~S
SRnMode, and level shifting apparatus 330 produces switching signal S
LS1~S
LSnMode be this area personage and know very well, so repeat no more.
In addition, in the present embodiment, the output signal S that snubber assembly 350 is produced
OUT1~S
OUTn, can be used as the sweep signal S1~Sn among Fig. 2.Because output signal S
OUT1~S
OUTnTrailing edge along all having at least two different descending slopes, so as if exporting signal S
OUT1~S
OUTnAs sweep signal S1~Sn, then can make the signal of pixel electrode of pixel cell of the approximate far-end (away from gate drivers) of signal of pixel electrode of the pixel cell of near-end (near gate drivers), and then logical (feed-through) phenomenon of avoiding bursting.
Fig. 4 A is that one of snubber assembly of the present invention maybe embodiment.Generally speaking, in order to produce output signal S
OUT1~S
OUTn, snubber assembly 350 has many identical buffer circuits, and each buffer circuit produces a corresponding output signal.Be convenient explanation, Fig. 4 A only shows single buffer circuit, the output signal S that it produced
OUTCan be output signal S
OUT1~S
OUTnAny one.
Shown in Fig. 4 A, snubber assembly 350 comprises drawing-die piece 410 and drop-down module 430.Last drawing-die piece 410 makes output signal S
OUTHas a rising edge edge.Drop-down module 430 makes output signal S
OUTHas a decline edge.In the present embodiment, output signal S
OUTTrailing edge along having a plurality of sloping portions.The slope of one first sloping portion in these sloping portions is different from the slope of one second sloping portion in these parts.
In other words, output signal S
OUTTrailing edge along having two different slopes.In another possibility embodiment, output signal S
OUTTrailing edge along can having the Different Slope more than three.In this example, the two in this three slope maybe be identical, but be different from another.
Fig. 4 B is output signal S
OUTSynoptic diagram.As shown in the figure, in period P
1, last drawing-die piece 410 will be exported signal S
OUTLevel be pulled to VH by VL.Therefore, output signal S
OUTHas a rising edge along 421.In period P
2, drop-down module 430 will be exported signal S earlier
OUTLevel be pulled down to VY by VH, then in period P
3, will export signal S again
OUTLevel be pulled down to VL by VY.Therefore, output signal S
OUTTrailing edge along having sloping portion 422 and 423, wherein the slope of sloping portion 422 is different from the slope of sloping portion 423.
Fig. 4 C is another possibility embodiment of output signal of the present invention.In the present embodiment, output signal S
OUTTrailing edge along having three sloping portions 441~443.Sloping portion 441~443 has slope S lope1~Slope3 respectively.In Fig. 4 C, slope S lope1~Slope3 is all inequality, but is not in order to restriction the present invention.In other embodiments, output signal S
OUTThe first and the 3rd sloping portion on trailing edge edge have identical slope, but the slope of the 3rd sloping portion is different from the slope of second sloping portion.
Please refer to Fig. 4 A, in the present embodiment, last drawing-die piece 410 comprises switch element SW1.Switch element SW1 is coupled to operating voltage V
DDAnd between the output node ND.The signal of output node ND is output signal S
OUTIn period P
1, switch element SW1 conducting, switch element SW2 conducting is in order to operating voltage V
DDBe sent to node ND, therefore, can make output signal S
OUTHas a rising edge along (shown in Fig. 4 B421).
Drop-down module 430 comprises switch element SW2 and SW3.Switch element SW2 is coupled between node ND and the operating voltage VL1.In period P
2, switch element SW2 conducting, not conducting of switch element SW1 is in order to be sent to node ND with operating voltage VL1.In the present embodiment, operating voltage VL1 is less than operating voltage V
DD
Switch element SW3 is coupled between node ND and the operating voltage VL2.In period P
3, switch element SW3 conducting is in order to be sent to node ND with operating voltage VL2.The present invention is the relation between restriction operation voltage VL1 and the VL2 not.
In a possibility embodiment, operating voltage VL1 is less than operating voltage V
DD, and greater than operating voltage VL2.In last example, in switch element SW2 and not conducting simultaneously of SW3.That is to say, in period P
3, not conducting of switch element SW2.
In another possibility embodiment, operating voltage VL1 equals operating voltage VL2, and less than operating voltage V
DDIn this example, in period P
2, switch element SW2 is switched on, and not conducting of switch element SW3.In period P
3, switch element SW2 and SW3 all are switched on.
The present invention is the constituted mode of limit switch cell S W1~SW3 not.In a possibility embodiment, switch element SW1 is made up of at least one P transistor npn npn, and switch SW 2 and SW3 constitute by at least one N transistor npn npn.In another possibility embodiment, switch element SW1 can be made up of at least one N transistor npn npn, and switch SW 2 and SW3 are made up of at least one P transistor npn npn.
In addition, in a possibility embodiment, operating voltage VL2 is in the gate drivers 210, minimum operating voltage.For example, please refer to Fig. 3, shift LD device 310 is according to operating voltage V
CCAnd V
SS, carry out shift motion to opening beginning signal CLK.In a possibility embodiment, operating voltage V
CCLess than operating voltage V
DD, and operating voltage V
SSGreater than operating voltage V
EEIn addition, level shifting apparatus 330 is according to operating voltage V
DDWith V
EE, to shift signal S
SR1~S
SRnCarry out the level conversion action.In the present embodiment, operating voltage V
EEEqual operating voltage VL2.
Because the output signal S that snubber assembly 350 is produced
OUTHave at least two different descending slopes, so when snubber assembly 350 is applied among the gate drivers of display system, then can improve the stray capacitance (Cgd in the pixel cell; Show) the routed influence of leading to effect that causes.Therefore, when the panel size of display system became big, the pixel electrode signal of the pixel cell at gate line two ends was close to and equates.
Though the present invention with preferred embodiment openly as above; Right its is not in order to limit the present invention; Those skilled in the art are not breaking away from the spirit and scope of the present invention, and when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the appended claims person of defining.