CN103325335B - Display and driving method thereof - Google Patents
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Abstract
The invention provides a kind of display and driving method thereof, this display has an image element circuit.This image element circuit comprises an Organic Light Emitting Diode, a transistor, one first electric capacity, one second electric capacity, one first switch, a second switch, one the 3rd switch and a switch element.The present invention also provides a kind of for driving the driving method of this image element circuit, thus this first switch, this second switch, the 3rd switch and this switch element are controlled, the drive current produced to make this transistor has nothing to do with the critical voltage of this transistor in fact.
Description
Technical field
The present invention relates to a kind of display technique, particularly relate to a kind of Organic Light Emitting Diode (OLED) display and driving method thereof.
Background technology
Due to OLED display there is autoluminescence, the advantage such as brightness is high, the reaction time is fast and visual angle is wide, little by little come into one's own and used.
One OLED display is by multiple arrangement in array and the image element circuit that can manifest different color reaches the function of show image, and is that line by line or by column image element circuit described in P-SCAN decides the light intensity of each image element circuit.Each image element circuit comprises an OLED, and produces the drive current that drives this OLED, sends the intensity light relevant to this drive current size to make this OLED.
Consult Fig. 1 and Fig. 2, a kind of existing image element circuit comprises OLED 11, the first transistor 12, transistor seconds 13, third transistor 14, the 4th transistor 15, the 5th transistor 16, the 6th transistor 17,1 first electric capacity 18 and one second electric capacity 19.First to the 6th transistor 12 ~ 17 is N-type TFT (TFT).
Existing image element circuit receives a data-signal, one first sweep signal, an enable signal, a complementary enable signal, one second sweep signal, a reference signal and a reset signal, and control by the first sweep signal, enable signal, complementary enable signal and the second sweep signal, make it operate and can be divided into three phases, namely reset phase, compensated stage and glow phase.
In compensated stage, the voltage on the source electrode of transistor seconds 13 is V
dATA-V
t, wherein, V
dATAthe voltage of data-signal, V
tit is the critical voltage of transistor seconds 13.
In glow phase, the voltage V on the anode of OLED 11
oLED_Aand the critical voltage V of transistor seconds 13
tbe coupled to the grid of transistor seconds 13 via the second electric capacity 19, make the voltage V on the grid of transistor seconds 13
gas shown below:
V
G＝V
REF+(V
OLED_A-V
DATA+V
T)f，
Wherein, V
rEFthe voltage of reference signal, f=C
2/ (C
2+ C
p), C
2the capacitance of the second electric capacity 19, C
pit is the capacitance of the stray capacitance relevant to the grid of transistor seconds 13.
Transistor seconds 13 produces drive current I as shown below
dRIVE:
Wherein, W/L is the breadth length ratio of transistor seconds 13.
Ideally, if C
2> > C
p, then f ≈ 1, above formula can be reduced to I
dRIVE≈ k (V
rEF-V
dATA)
2, therefore, drive current I
dRIVEwith the critical voltage V of transistor seconds 13
t, OLED 11 anode on voltage V
oLED_Airrelevant.
In fact, C cannot be reached when designing because of limited space
2> > C
p, cause f < 1, therefore, although existing image element circuit can compensate the critical voltage V of transistor seconds 13 in certain degree
tvariation to drive current I
dRIVEimpact, but drive current I
dRIVEstill with critical voltage V
trelevant, still can be subject to critical voltage V
tvariation impact.
Summary of the invention
An object of the present invention is to provide a kind of display, can eliminate the impact of critical voltage variation.
And another object of the present invention is to provide a kind of driving method, the impact of critical voltage variation can be eliminated.Inventive display has an image element circuit.This image element circuit comprises an Organic Light Emitting Diode, a transistor, one first electric capacity, one second electric capacity, one first switch, a second switch, one the 3rd switch and a switch element.This Organic Light Emitting Diode has an anode, and the negative electrode that is electrically connected to one first power end.This transistor has the second end that a first end, is electrically connected to the anode of this Organic Light Emitting Diode, and a control end.This first electric capacity has a first end, and the second end that is electrically connected to the control end of this transistor.This second electric capacity has the first end that is electrically connected to the first end of this first electric capacity, and the second end that is electrically connected to the second end of this transistor.This first switch is electrically connected to the first end of this first electric capacity, and switches between conducting and not conducting according to one scan signal, and one data-signal is delivered to the first end of this first electric capacity when conducting.This second switch is connected electrically between a second source end and the first end of this transistor, and switches between conducting and not conducting according to an enable signal.3rd switch is connected electrically between the first end of this transistor and control end, and switches between conducting and not conducting according to a compensating signal.This switch element is electrically connected to the second end of this transistor, and do not switch between conduction mode at a conduction mode and according to this compensating signal, and when this conduction mode, the one in the voltage on the first end of this enable signal, this first electric capacity, a reference signal and this sweep signal is delivered to the second end of this transistor.
Wherein, this switch element comprises the 4th switch that is electrically connected to the second end of this transistor.When this switch element is at this conduction mode, the 4th switch conduction, to be delivered to the second end of this transistor by the voltage on the first end of this enable signal, this first electric capacity and the one in this reference signal.When this switch element this not conduction mode time, the 4th switch not conducting.
And driving method of the present invention is applicable to drive above-mentioned image element circuit, and comprise following steps:
(A) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor not conducting, this first switch conduction, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode;
(B) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make not conducting after this Organic Light Emitting Diode not conducting, the first conducting of this transistor, this first switch conduction, this second switch not conducting, the 3rd switch conduction, and this switch element is at this conduction mode;
(C) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor turns, this first switch conduction, this second switch not conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode; And
(D) this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode conducting, this transistor turns, this first switch not conducting, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode.
Wherein, this switch element comprises the 4th switch that is electrically connected to the second end of this transistor, and the 5th switch that is electrically connected to the first end of this first electric capacity.When this switch element is at this conduction mode, 4th switch conduction, the one in the voltage on the first end of this enable signal, this first electric capacity, this reference signal and this sweep signal to be delivered to the second end of this transistor, 5th switch conduction, to be delivered to the first end of this first electric capacity by the one in the voltage on the second end of this enable signal, this transistor, this reference signal and this sweep signal.When this switch element this not conduction mode time, the 4th switch and the 5th switch not conducting.
And driving method of the present invention is applicable to drive above-mentioned image element circuit, and comprise following steps:
(A) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor not conducting, this first switch conduction, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode;
(B) this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make not conducting after this Organic Light Emitting Diode not conducting, the first conducting of this transistor, this first switch not conducting, this second switch not conducting, the 3rd switch conduction, and this switch element is at this conduction mode;
(C) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor turns, this first switch conduction, this second switch not conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode; And
(D) this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode conducting, this transistor turns, this first switch not conducting, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode.
Beneficial effect of the present invention is: by this image element circuit and this driving method, and a drive current that this transistor can be made to produce has nothing to do with the critical voltage of this transistor in fact.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is a kind of circuit diagram of existing image element circuit;
Fig. 2 is the sequential chart of the image element circuit shown in Fig. 1;
Fig. 3 is the circuit diagram of the image element circuit of the first preferred embodiment of inventive display;
Fig. 4 and Fig. 5 is the sequential chart of the image element circuit shown in Fig. 3;
Fig. 6 to Fig. 8 is the circuit diagram of the image element circuit of the second to the 4th preferred embodiment of inventive display respectively;
Fig. 9 to Figure 11 is the sequential chart of the image element circuit shown in Fig. 8;
Figure 12 to Figure 25 is the circuit diagram of the image element circuit of the 5th to the 18 preferred embodiment of inventive display respectively;
Figure 26 is the process flow diagram of the first preferred embodiment of driving method of the present invention;
Figure 27 is the process flow diagram of the second preferred embodiment of driving method of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
First preferred embodiment of display
Consult Fig. 3, the first preferred embodiment of inventive display has at least one image element circuit.Image element circuit comprises OLED 31, transistor 32,1 first electric capacity 33,1 second electric capacity 34,1 first switch 35, second switch 36, the 3rd switch 37 and a switch element 38.
OLED 31 has an anode, and the negative electrode that is electrically connected to one first power end 41.Transistor 32 has the second end that a first end, is electrically connected to the anode of OLED 31, and a control end.First electric capacity 33 has a first end, and the second end that is electrically connected to the control end of transistor 32.Second electric capacity 34 has the first end that is electrically connected to the first end of the first electric capacity 33, and the second end that is electrically connected to the second end of transistor 32.First switch 35 is electrically connected to the first end of the first electric capacity 33, and switches between conducting and not conducting according to one scan signal, and one data-signal is delivered to the first end of the first electric capacity 33 when conducting.Second switch 36 is connected electrically between a second source end 42 and the first end of transistor 32, and switches between conducting and not conducting according to an enable signal.Between the first end that 3rd switch 37 is connected electrically in transistor 32 and control end, and switch between conducting and not conducting according to a compensating signal.Switch element 38 is electrically connected to the second end of transistor 32, and does not switch between conduction mode at a conduction mode and one according to compensating signal, and when conduction mode, enable signal is delivered to the second end of transistor 32.
In the present embodiment, transistor 32 is N-type TFT.Switch element 38 comprises the 4th switch 381 that is electrically connected to the second end of transistor 32, when switch element 38 is at conduction mode, the 4th switch 381 conducting, to be delivered to the second end of transistor 32 by enable signal, when switch element 38 is at not conduction mode, the 4th switch 381 not conducting.First to fourth switch 35 ~ 37,381 realizes with N-type TFT.
Consult Fig. 3 and Fig. 4, the operation of the present embodiment image element circuit can be divided into four-stage, namely reset phase, compensated stage, write phase and glow phase.Below describe this four-stage in detail.
I. reset phase
Data-signal is at a reset voltage V
rST, sweep signal is at a logic high V
h, enable signal is at logic high V
h, and compensating signal is at a logic low V
l, make OLED 31 not conducting, transistor 32 not conducting, the first switch 35 conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 is at not conduction mode (namely the 4th switch 381 not conducting).Therefore, the voltage V on second source end 42
dDbe delivered to the first end of transistor 32 via second switch 36, data-signal is delivered to the first end of the first electric capacity 33 via the first switch 35, is then coupled to the control end of transistor 32 via the first electric capacity 33, makes the voltage on the first end of the first electric capacity 33 be V
rST, the voltage on the control end of transistor 32 is V
l+ V
t(previous stage makes the cross-pressure of the first electric capacity 33 be V
l+ V
t-V
rST), wherein, V
tit is the critical voltage of transistor 32.In order to make transistor 32 not conducting, following formula needs to set up:
Wherein, V
sSbe the voltage on the first power end 41, V
oLED(0) be the critical voltage of OLED 31.
II. compensated stage
Data-signal is at reset voltage V
rST, sweep signal is at logic high V
h, enable signal is at logic low V
l, and compensating signal is at logic high V
h, make not conducting after OLED 31 not conducting, the first conducting of transistor 32, the first switch 35 conducting, second switch 36 not conducting, the 3rd switch 37 conducting, and switch element 38 is in conduction mode (namely the 4th switch 381 conducting).Therefore, data-signal is delivered to the first end of the first electric capacity 33 via the first switch 35, makes the voltage on the first end of the first electric capacity 33 be V
rST, enable signal is delivered to the second end of transistor 32 via the 4th switch 381, makes the voltage on the second end of transistor 32 be V
l.3rd switch 37 conducting makes transistor 32 be driven high and conducting because of the voltage on its control end, and the voltage drop on its first end and control end is low to moderate V
l+ V
t, then transfer not conducting to.
III. write phase
Data-signal is at a data voltage V
dATA, sweep signal is at logic high V
h, enable signal is at logic low V
l, and compensating signal is at logic low V
l, make OLED 31 not conducting, transistor 32 conducting, the first switch 35 conducting, second switch 36 not conducting, the 3rd switch 37 not conducting, and switch element 38 is at not conduction mode (namely the 4th switch 381 not conducting).Therefore, data-signal is delivered to the first end of the first electric capacity 33 via the first switch 35, then be coupled to the control end of transistor 32 via the first electric capacity 33, and be coupled to the second end of transistor 32 via the second electric capacity 34, make the voltage on the first end of the first electric capacity 33 be V
dATA, the voltage on the control end of transistor 32 is V
l+ V
t+ V
dATA-V
rST, the voltage on the second end of transistor 32 is V
l+ (V
dATA-V
rST) f
1, wherein, f
1=C
2/ (C
2+ C
p1), C
2the capacitance of the second electric capacity 34, C
p1it is the capacitance of the stray capacitance relevant to the second end of transistor 32.In order to make OLED 31 not conducting and transistor 32 conducting, following formula needs to set up:
IV. glow phase
Sweep signal is at logic low V
l, enable signal is at logic high V
h, and compensating signal is at logic low V
l, make OLED 31 conducting, transistor 32 conducting, the first switch 35 not conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 is at not conduction mode (namely the 4th switch 381 not conducting).Therefore, the first end of the first electric capacity 33 at floating, the voltage V on the second end of transistor 32
oLED_Arelevant to OLED 31, and the control end of transistor 32 is coupled to via the second electric capacity 34, make the voltage V on the control end of transistor 32
gas shown below:
Wherein, f
2=C
2/ (C
2+ C
p2), C
p2the capacitance of the stray capacitance relevant to the first end of the first electric capacity 33, f
3=f
1f
2.
Transistor 32 produces a drive current I as follows
dRIVE:
From above formula, drive current I
dRIVEwith the critical voltage V of transistor 32
tirrelevant, so the present embodiment image element circuit can eliminate critical voltage V
tthe impact of variation.
In addition, the quantity of the element that the present embodiment image element circuit uses is less than the quantity of the element that existing image element circuit uses, and the quantity of signal that the present embodiment image element circuit receives is less than the quantity of the signal that existing image element circuit receives, so the present embodiment image element circuit can be saved layout area and increase light-emitting area.
Consult Fig. 3 and Fig. 5, when the present embodiment display be scan by column time, the image element circuit being positioned at different lines can operate in reset phase simultaneously, then operate in compensated stage simultaneously, then operation serial word is in write phase, but also can be that operation serial word is in reset phase and compensated stage (not shown).
Second preferred embodiment of display
Consult Fig. 6, the place that second preferred embodiment of inventive display is different from the first preferred embodiment is: (1) the 4th switch 381 ' is connected electrically between the second end of transistor 32 and the first end of the first electric capacity 33, when switch element 38 is at conduction mode, 4th switch 381 ' conducting, to be delivered to the second end of transistor 32 by the voltage on the first end of the first electric capacity 33; And (2) reset voltage V
rSTbe essentially logic low V
l.
3rd preferred embodiment of display
Consult Fig. 7, the place that the 3rd preferred embodiment of inventive display is different from the first preferred embodiment is: when switch element 38 is at conduction mode, the 4th switch 381 " conducting, with by one at logic low V
lreference signal be delivered to the second end of transistor 32.
4th preferred embodiment of display
Consult Fig. 8, the place that 4th preferred embodiment of inventive display is different from the first preferred embodiment is: switch element 38 ' also comprises the 5th switch 382 that is electrically connected to the first end of the first electric capacity 33, when switch element 38 ' is at conduction mode, 5th switch 382 conducting, enable signal to be delivered to the first end of the first electric capacity 33, when switch element 38 ' is at not conduction mode, the 5th switch 382 not conducting.In the present embodiment, the 5th switch 382 realizes with N-type TFT.
Consult Fig. 8 and Fig. 9, the operation of the present embodiment image element circuit can be divided into four-stage, namely reset phase, compensated stage, write phase and glow phase.Below describe this four-stage in detail.
I. reset phase
Data-signal is at a reset voltage V
rST, sweep signal is at a logic high V
h, enable signal is at logic high V
h, and compensating signal is at a logic low V
lmake OLED 31 not conducting, transistor 32 not conducting, the first switch 35 conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 ' is at not conduction mode (namely the 4th switch 381 not conducting, the 5th switch 382 not conducting).Therefore, the voltage V on second source end 42
dDbe delivered to the first end of transistor 32 via second switch 36, data-signal is delivered to the first end of the first electric capacity 33 via the first switch 35, and is coupled to the control end of transistor 32 via the first electric capacity 33, makes the voltage on the first end of the first electric capacity 33 be V
rST, the voltage on the control end of transistor 32 is V
rST+ V
t(previous stage makes the cross-pressure of the first electric capacity 33 be V
t), wherein, V
tit is the critical voltage of transistor 32.In order to make transistor 32 not conducting, following formula needs to set up:
Wherein, V
sSbe the voltage on the first power end 41, V
oLED(0) be the critical voltage of OLED 31.
II. compensated stage
Sweep signal is at logic low V
l, enable signal is at logic low V
l, and compensating signal is at logic high V
hmake not conducting after OLED 31 not conducting, the first conducting of transistor 32, the first switch 35 not conducting, second switch 36 not conducting, the 3rd switch 37 conducting, and switch element 38 ' is in conduction mode (namely the 4th switch 381 conducting, the 5th switch 382 conducting).Therefore, enable signal is delivered to the first end of the first electric capacity 33 via the 5th switch 382, and is delivered to the second end of transistor 32 via the 4th switch 381, makes the voltage on the first end of the first electric capacity 33 be V
l, the voltage on the second end of transistor 32 is V
l.3rd switch 37 conducting makes transistor 32 be driven high and conducting because of the voltage on its control end, and the voltage drop on its first end and control end is low to moderate V
l+ V
t, then transfer not conducting to.
III. write phase
Data-signal is at a data voltage V
dATA, sweep signal is at logic high V
h, enable signal is at logic low V
l, and compensating signal is at logic low V
lmake OLED 31 not conducting, transistor 32 conducting, the first switch 35 conducting, second switch 36 not conducting, the 3rd switch 37 not conducting, and switch element 38 ' is at not conduction mode (namely the 4th switch 381 not conducting, the 5th switch 382 not conducting).Therefore, data-signal is delivered to the first end of the first electric capacity 33 via the first switch 35, then be coupled to the control end of transistor 32 via the first electric capacity 33, and be coupled to the second end of transistor 32 via the second electric capacity 34, make the voltage on the first end of the first electric capacity 33 be V
dATA, the voltage on the control end of transistor 32 is V
dATA+ V
t, the voltage on the second end of transistor 32 is V
l+ (V
dATA-V
l) f
1, wherein, f
1=C
2/ (C
2+ C
p1), C
2the capacitance of the second electric capacity 34, C
p1it is the capacitance of the stray capacitance relevant to the second end of transistor 32.In order to make OLED 31 not conducting and transistor 32 conducting, following formula needs to set up:
IV. glow phase
Sweep signal is at logic low V
l, enable signal is at logic high V
h, and compensating signal is at logic low V
lmake OLED 31 conducting, transistor 32 conducting, the first switch 35 not conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 ' is at not conduction mode (namely the 4th switch 381 not conducting, the 5th switch 382 not conducting).Therefore, the first end of the first electric capacity 33 at floating, the voltage V on the second end of transistor 32
oLED_Arelevant to OLED 31, and the control end of transistor 32 is coupled to via the second electric capacity 34, make the voltage V on the control end of transistor 32
gas shown below:
Wherein, f
2=C
2/ (C
2+ C
p2), C
p2the capacitance of the stray capacitance relevant to the first end of the first electric capacity 33, f
3=f
1f
2.
Transistor 32 produces a drive current I as follows
dRIVE:
From above formula, drive current I
dRIVEwith the critical voltage V of transistor 32
tirrelevant, so the present embodiment image element circuit can eliminate critical voltage V
tthe impact of variation.
In addition, the quantity of the signal that the present embodiment image element circuit receives is less than the quantity of the signal that existing image element circuit receives, so the present embodiment image element circuit can be saved layout area and increase light-emitting area.
Consult Fig. 8, Figure 10 and Figure 11, when the present embodiment display be scan by column time, the image element circuit being positioned at different lines can not share enable signal and compensating signal, as shown in Figure 10, but the image element circuit being positioned at different lines also can share enable signal and compensating signal, as shown in figure 11, to save layout area and to increase light-emitting area.In addition, be positioned at the image element circuit of wherein row when operating in compensated stage, the image element circuit being positioned at another row is operable in reset phase or write phase, as shown in Figure 10, or be positioned at different lines image element circuit can operation serial word at reset phase, then operate in compensated stage simultaneously, then operation serial word is in write phase, as shown in figure 11, but also can be that the image element circuit being positioned at different lines operates in reset phase simultaneously, then operate in compensated stage, then operation serial word is in write phase (not shown) simultaneously.
5th preferred embodiment of display
Consult Figure 12, the place that 5th preferred embodiment of inventive display is different from the 4th preferred embodiment is: between the first end that the 5th switch 382 ' is connected electrically in the first electric capacity 33 and the second end of transistor 32, when switch element 38 ' is at conduction mode, 5th switch 382 ' conducting, to be delivered to the first end of the first electric capacity 33 by the voltage on the second end of transistor 32.
6th preferred embodiment of display
Consult Figure 13, the place that the 6th preferred embodiment of inventive display is different from the 4th preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " conducting, with by one at logic low V
lreference signal be delivered to the first end of the first electric capacity 33.
7th preferred embodiment of display
Consult Figure 14, the place that the 7th preferred embodiment of inventive display is different from the 4th preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " ' conducting, sweep signal to be delivered to the first end of the first electric capacity 33.
8th preferred embodiment of display
Consult Figure 15, the place that 8th preferred embodiment of inventive display is different from the 4th preferred embodiment is: the 4th switch 381 ' is connected electrically between the second end of transistor 32 and the first end of the first electric capacity 33, when switch element 38 ' is at conduction mode, 4th switch 381 ' conducting, to be delivered to the second end of transistor 32 by the voltage on the first end of the first electric capacity 33.
9th preferred embodiment of display
Consult Figure 16, the place that the 9th preferred embodiment of inventive display is different from the 8th preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " conducting, with by one at logic low V
lreference signal be delivered to the first end of the first electric capacity 33.
Tenth preferred embodiment of display
Consult Figure 17, the place that the tenth preferred embodiment of inventive display is different from the 8th preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " ' conducting, sweep signal to be delivered to the first end of the first electric capacity 33.
11 preferred embodiment of display
Consult Figure 18, the place that the 11 preferred embodiment of inventive display is different from the 4th preferred embodiment is: when switch element 38 ' is at conduction mode, the 4th switch 381 " conducting, with by one at logic low V
lreference signal be delivered to the second end of transistor 32.
12 preferred embodiment of display
Consult Figure 19, the place that 12 preferred embodiment of inventive display is different from the 11 preferred embodiment is: between the first end that the 5th switch 382 ' is connected electrically in the first electric capacity 33 and the second end of transistor 32, when switch element 38 ' is at conduction mode, 5th switch 382 ' conducting, to be delivered to the first end of the first electric capacity 33 by the voltage on the second end of transistor 32.
13 preferred embodiment of display
Consult Figure 20, the place that the 13 preferred embodiment of inventive display is different from the 11 preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " conducting, the first end of the first electric capacity 33 is delivered to Reference Signal.
14 preferred embodiment of display
Consult Figure 21, the place that the 14 preferred embodiment of inventive display is different from the 11 preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " ' conducting, sweep signal to be delivered to the first end of the first electric capacity 33.
15 preferred embodiment of display
Consult Figure 22, the place that the 15 preferred embodiment of inventive display is different from the 4th preferred embodiment is: when switch element 38 ' is at conduction mode, the 4th switch 381 " ' conducting, sweep signal to be delivered to the second end of transistor 32.
16 preferred embodiment of display
Consult Figure 23, the place that 16 preferred embodiment of inventive display is different from the 15 preferred embodiment is: between the first end that the 5th switch 382 ' is connected electrically in the first electric capacity 33 and the second end of transistor 32, when switch element 38 ' is at conduction mode, 5th switch 382 ' conducting, to be delivered to the first end of the first electric capacity 33 by the voltage on the second end of transistor 32.
17 preferred embodiment of display
Consult Figure 24, the place that the 17 preferred embodiment of inventive display is different from the 15 preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " conducting, with by one at logic low V
lreference signal be delivered to the first end of the first electric capacity 33.
18 preferred embodiment of display
Consult Figure 25, the place that the 18 preferred embodiment of inventive display is different from the 15 preferred embodiment is: when switch element 38 ' is at conduction mode, the 5th switch 382 " ' conducting, sweep signal to be delivered to the first end of the first electric capacity 33.
First preferred embodiment of driving method
Consult Figure 26, the first preferred embodiment of driving method of the present invention is applicable to drive the image element circuit of any one in the first of above-described display to the 3rd preferred embodiment, and comprises following steps 51 ~ 54.
Step 51: apply data-signal, sweep signal, enable signal and compensating signal to image element circuit, to make OLED 31 not conducting, transistor 32 not conducting, the first switch 35 conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 is at not conduction mode.
Step 52: apply data-signal, sweep signal, enable signal and compensating signal to image element circuit, to make not conducting after OLED 31 not conducting, the first conducting of transistor 32, the first switch 35 conducting, second switch 36 not conducting, the 3rd switch 37 conducting, and switch element 38 is at conduction mode.
Step 53: apply data-signal, sweep signal, enable signal and compensating signal to image element circuit, to make OLED 31 not conducting, transistor 32 conducting, the first switch 35 conducting, second switch 36 not conducting, the 3rd switch 37 not conducting, and switch element 38 is at not conduction mode.
Step 54: apply sweep signal, enable signal and compensating signal to image element circuit, to make OLED 31 conducting, transistor 32 conducting, the first switch 35 not conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 is at not conduction mode.
Second preferred embodiment of driving method
Consult Figure 27, the second preferred embodiment of driving method of the present invention is applicable to drive the image element circuit of any one in the 4th to the 18 preferred embodiment of above-described display, and comprises following steps 61 ~ 64.
Step 61: apply data-signal, sweep signal, enable signal and compensating signal to image element circuit, to make OLED 31 not conducting, transistor 32 not conducting, the first switch 35 conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 ' is at not conduction mode.
Step 62: apply sweep signal, enable signal and compensating signal to image element circuit, to make not conducting after OLED 31 not conducting, the first conducting of transistor 32, the first switch 35 not conducting, second switch 36 not conducting, the 3rd switch 37 conducting, and switch element 38 ' is at conduction mode.
Step 63: apply data-signal, sweep signal, enable signal and compensating signal to image element circuit, to make OLED 31 not conducting, transistor 32 conducting, the first switch 35 conducting, second switch 36 not conducting, the 3rd switch 37 not conducting, and switch element 38 ' is at not conduction mode.
Step 64: apply sweep signal, enable signal and compensating signal to image element circuit, to make OLED 31 conducting, transistor 32 conducting, the first switch 35 not conducting, second switch 36 conducting, the 3rd switch 37 not conducting, and switch element 38 ' is at not conduction mode.
In sum, by above-mentioned image element circuit and above-mentioned driving method, the drive current I that transistor 32 produces can be made
dRIVEin fact with the critical voltage V of transistor 32
tirrelevant, therefore really can reach object of the present invention.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (10)
1. a display, has an image element circuit, it is characterized in that this image element circuit comprises:
An Organic Light Emitting Diode, has an anode, and a negative electrode being electrically connected to first power end;
A transistor, has a first end, second end being electrically connected to the anode of this Organic Light Emitting Diode, and a control end;
First electric capacity, has a first end, and second end being electrically connected to the control end of this transistor;
Second electric capacity, has the first end that is electrically connected to the first end of this first electric capacity, and second end being electrically connected to the second end of this transistor;
First switch, is electrically connected to the first end of this first electric capacity, and switches between conducting and not conducting according to a sweep signal, and when conducting, a data-signal is delivered to the first end of this first electric capacity;
A second switch, is connected electrically between a second source end and the first end of this transistor, and switches between conducting and not conducting according to an enable signal;
3rd switch, is connected electrically between the first end of this transistor and control end, and switches between conducting and not conducting according to a compensating signal; And
A switch element, be electrically connected to the second end of this transistor, and do not switch between conduction mode a conduction mode and one according to this compensating signal, and when this conduction mode, the one in the voltage on the first end of this enable signal, this first electric capacity, a reference signal and this sweep signal is delivered to the second end of this transistor.
2. display as claimed in claim 1, it is characterized in that: this switch element comprises the 4th switch that is electrically connected to the second end of this transistor, when this switch element is at this conduction mode, 4th switch conduction, this enable signal to be delivered to the second end of this transistor, when this switch element this not conduction mode time, the 4th switch not conducting.
3. display as claimed in claim 2, it is characterized in that: this switch element also comprises the 5th switch that is electrically connected to the first end of this first electric capacity, when this switch element is at this conduction mode, 5th switch conduction, the one in the voltage on the second end of this enable signal, this transistor, this reference signal and this sweep signal to be delivered to the first end of this first electric capacity, when this switch element this not conduction mode time, the 5th switch not conducting.
4. display as claimed in claim 1, it is characterized in that: this switch element comprises the 4th switch be connected electrically between the second end of this transistor and the first end of this first electric capacity, when this switch element is at this conduction mode, 4th switch conduction, the voltage on the first end of this first electric capacity to be delivered to the second end of this transistor, when this switch element this not conduction mode time, the 4th switch not conducting.
5. display as claimed in claim 4, it is characterized in that: this switch element also comprises the 5th switch that is electrically connected to the first end of this first electric capacity, when this switch element is at this conduction mode, 5th switch conduction, the one in this enable signal, this reference signal and this sweep signal to be delivered to the first end of this first electric capacity, when this switch element this not conduction mode time, the 5th switch not conducting.
6. display as claimed in claim 1, it is characterized in that: this switch element comprises the 4th switch that is electrically connected to the second end of this transistor, when this switch element is at this conduction mode, 4th switch conduction, this reference signal to be delivered to the second end of this transistor, when this switch element this not conduction mode time, the 4th switch not conducting.
7. display as claimed in claim 6, it is characterized in that: this switch element also comprises the 5th switch that is electrically connected to the first end of this first electric capacity, when this switch element is at this conduction mode, 5th switch conduction, the one in the voltage on the second end of this enable signal, this transistor, this reference signal and this sweep signal to be delivered to the first end of this first electric capacity, when this switch element this not conduction mode time, the 5th switch not conducting.
8. display as claimed in claim 1, it is characterized in that: this switch element comprises the 4th switch that is electrically connected to the second end of this transistor, and the 5th switch being electrically connected to the first end of this first electric capacity, when this switch element is at this conduction mode, 4th switch conduction, this sweep signal to be delivered to the second end of this transistor, 5th switch conduction, with by this enable signal, voltage on second end of this transistor, one in this reference signal and this sweep signal is delivered to the first end of this first electric capacity, when this switch element this not conduction mode time, 4th switch and the 5th switch not conducting.
9. a driving method, is applicable to the image element circuit of the display driven according to any one of claim 2,4 and 6, it is characterized in that it comprises following steps:
(A) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor not conducting, this first switch conduction, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode;
(B) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make not conducting after this Organic Light Emitting Diode not conducting, the first conducting of this transistor, this first switch conduction, this second switch not conducting, the 3rd switch conduction, and this switch element is at this conduction mode;
(C) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor turns, this first switch conduction, this second switch not conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode; And
(D) this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode conducting, this transistor turns, this first switch not conducting, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode.
10. a driving method, is applicable to the image element circuit of the display driven according to any one of claim 3,5,7 and 8, it is characterized in that it comprises following steps:
(A) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor not conducting, this first switch conduction, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode;
(B) this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make not conducting after this Organic Light Emitting Diode not conducting, the first conducting of this transistor, this first switch not conducting, this second switch not conducting, the 3rd switch conduction, and this switch element is at this conduction mode;
(C) this data-signal, this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode not conducting, this transistor turns, this first switch conduction, this second switch not conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode; And
(D) this sweep signal, this enable signal and this compensating signal is applied to this image element circuit, to make this Organic Light Emitting Diode conducting, this transistor turns, this first switch not conducting, this second switch conducting, the 3rd switch not conducting, and this switch element is at this not conduction mode.
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| CN104103238B (en) * | 2014-06-17 | 2016-04-06 | 京东方科技集团股份有限公司 | A kind of image element circuit and driving method, display device |
| KR102456297B1 (en) * | 2016-04-15 | 2022-10-20 | 삼성디스플레이 주식회사 | Pixel circuit and method of driving the same |
| CN105913802B (en) * | 2016-06-30 | 2018-09-21 | 上海天马有机发光显示技术有限公司 | A kind of organic electroluminescent LED display panel and its driving method |
| CN109308875A (en) * | 2017-07-27 | 2019-02-05 | 京东方科技集团股份有限公司 | A kind of pixel circuit, its driving method, display panel and display device |
| TWI699577B (en) * | 2018-10-05 | 2020-07-21 | 友達光電股份有限公司 | Pixel structure |
| TWI681378B (en) * | 2018-11-15 | 2020-01-01 | 友達光電股份有限公司 | Display panel |
| TWI738426B (en) * | 2020-07-20 | 2021-09-01 | 友達光電股份有限公司 | Pixel circuit and pixel circuit driving method |
| CN118053388A (en) * | 2024-01-29 | 2024-05-17 | 云谷（固安）科技有限公司 | Pixel driving circuit and display panel |
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