CN203607085U - Picture element unit and drive circuit - Google Patents
Picture element unit and drive circuit Download PDFInfo
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- CN203607085U CN203607085U CN201320703919.8U CN201320703919U CN203607085U CN 203607085 U CN203607085 U CN 203607085U CN 201320703919 U CN201320703919 U CN 201320703919U CN 203607085 U CN203607085 U CN 203607085U
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Abstract
A picture element unit and a drive circuit are provided; the picture element unit comprises a lighting element and the drive circuit; the drive circuit comprises a fist transistor, a first switch, a capacitor, and a control module; the first switch comprises a first end electrically connected with a first power supply voltage, a second end electrically connected with a control end of the first transistor, and a control end receiving a first control signal; the capacitor is electrically connected between the control end of the first transistor and the second end; the control module is electrically connected between a second end of the first transistor and the lighting element; the control module receives a data voltage and the first control signal, and decides whether to generate parameter current relative to the data voltage and passing the first transistor according to at least the first control signal; the first transistor can generate a drive current equal to the parameter current according to cross voltage between the control end of the first transistor and the second end, thereby overcoming critical voltage offset problem of the first transistor.
Description
Technical field
The utility model relates to a kind of picture element unit and driving circuit, particularly relates to a kind of picture element unit and driving circuit of light-emitting component.
Background technology
Now, utilizing if the light-emitting component of light emitting diode (LED) and Organic Light Emitting Diode (OLED) is as light source, has been quite general application.And the brightness of light-emitting component is to decide according to the drive current flowing through on it, therefore, for one for driving the driving circuit of light-emitting component, wherein, for generation of the transistorized characteristic of drive current, often the luminescent properties of light-emitting component is had to maximum impact.
Because have homogeneity question on processing procedure, make the panel that formed with corresponding driving circuit by multiple light-emitting components, wherein, each transistorized critical voltage for generation of drive current is not identical, causes drive current variant.In addition, along with long Operation & use, each transistor for generation of drive current has degradation phenomena in various degree, also makes the degrees of offset of critical voltage inconsistent, also causes drive current variant.These all can cause under identical data input, but produce unequal drive current, and make the panel being made up of with corresponding driving circuit these light-emitting components present the phenomenon of brightness disproportionation or branding.
Summary of the invention
The purpose of this utility model is to provide a kind of picture element unit and driving circuit that not affected by the critical voltage of driving transistors.
The utility model picture element unit comprises one drive circuit and has a first end and a light-emitting component of one second end.Driving circuit comprises a first transistor, one first switch, a capacitor and a control module.
The first transistor comprises a first end, one second end and a control end.The first switch comprise the first end, the electrical connection the first transistor that are electrically connected one first supply voltage control end one second end and receive a control end of one first control signal, and according to the control of the first control signal, determine whether to export the control end of the first supply voltage to the first transistor.Capacitor electrode connects between the control end and the second end of the first transistor.
Control module is electrically connected between the second end of the first transistor and the first end of light-emitting component, and receive a data voltage and the first control signal, and at least according to the control of the first control signal, determine whether to produce and is relevant to data voltage and through a reference current of the first transistor, make the cross-pressure between control end and second end of the first transistor be relevant to reference current.The first transistor produces and the equal-sized drive current of reference current according to the cross-pressure between its control end and the second end.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, has a first end and a control end of the second end that is electrically connected respectively this second switch, and receives one second end of this data voltage.
One the 3rd switch, there is a first end of the second end of this first transistor of electrical connection, one second end of first end that is electrically connected this light-emitting component and a control end of reception one second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of one second control signal.
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of the first control signal of another row.
One the 3rd switch, there is a first end of the second end of this first transistor of electrical connection, one second end of first end that is electrically connected this light-emitting component and a control end of reception one second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of a reference voltage.
One the 3rd switch, there is a first end of the second end of this first transistor of electrical connection, one second end of first end that is electrically connected this light-emitting component and a control end of reception one second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, according to this first and second control signal, operate at a compensated stage and a glow phase: during at this compensated stage, this first control signal makes this first and second switch conduction, this second control signal makes the 3rd not conducting of switch, the reference current that makes this transistor seconds produce this to be relevant to this data voltage, this first transistor is adjusted the cross-pressure between its control end and the second end according to this reference current, and this cross-pressure of this capacitor stores is as a stored voltage.
When this glow phase after this compensated stage, this first control signal makes this first and second not conducting of switch, this second control signal makes the 3rd switch conduction, this the first transistor produces this drive current according to this stored voltage, and this drive current supplies via the 3rd switch of conducting should light-emitting component.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, has a first end and a control end of the second end that is electrically connected respectively this second switch, and receives one second end of this data voltage.
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this first control signal, and according to the control of this first control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of the first control signal of another row.
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this first control signal, and according to the control of this first control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of a reference voltage.
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this first control signal, and according to the control of this first control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
The utility model picture element unit, according to this first control signal, operate at a compensated stage and a glow phase: during at this compensated stage, this first control signal makes this first and second switch conduction, and make the 3rd not conducting of switch, this transistor seconds produces this and is relevant to the reference current of this data voltage, and this first transistor is adjusted the cross-pressure between its control end and the second end according to this reference current, and this cross-pressure of this capacitor stores is as a stored voltage.
When this glow phase after this compensated stage, this first control signal makes this first and second not conducting of switch, and make the 3rd switch conduction, and this first transistor produces this drive current according to this stored voltage, and this drive current supplies via the 3rd switch of conducting should light-emitting component.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, there is a first end, one second end that is electrically connected the second end of this first transistor and the first end of this light-emitting component and a control end that receives this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, has a first end and a control end of the second end that is electrically connected respectively this second switch, and receives one second end of this data voltage.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, there is a first end, one second end that is electrically connected the second end of this first transistor and the first end of this light-emitting component and a control end that receives this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of the first control signal of another row.
The utility model picture element unit, the first end of this first transistor receives this first supply voltage, this control module comprises: a second switch, there is a first end, one second end that is electrically connected the second end of this first transistor and the first end of this light-emitting component and a control end that receives this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch.
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of a reference voltage.
The utility model picture element unit, the second termination of this light-emitting component is received a second source voltage, according to this first control signal, operate at a compensated stage and a glow phase: during at this compensated stage, this first control signal makes this first and second switch conduction, make this transistor seconds produce this to be relevant to the reference current of this data voltage, this the first transistor is adjusted the cross-pressure between its control end and the second end according to this reference current, this cross-pressure of this capacitor stores is as a stored voltage, and the voltage of the second end of this first transistor and the difference of this second source voltage are less than the forward voltage of this light-emitting component.
When this glow phase after this compensated stage, this first control signal makes this first and second not conducting of switch, and this first transistor produces this drive current for should light-emitting component according to this stored voltage.
The utility model driving circuit, this driving circuit comprises:
One the first transistor, comprises a first end, one second end and a control end.
One first switch, comprise and be electrically connected a first end of one first supply voltage, one second end of control end that is electrically connected this first transistor and a control end of reception one first control signal, and according to the control of this first control signal, determine whether to export the control end of this first supply voltage to this first transistor.
One capacitor, is electrically connected between the control end and the second end of this first transistor.
One control module, be electrically connected on the second end of this first transistor, and receive a data voltage and this first control signal, and at least according to the control of this first control signal, determine whether to produce one and be relevant to this data voltage and the reference current through this first transistor, make the cross-pressure between control end and second end of this first transistor be relevant to this reference current, this first transistor according to the cross-pressure between its control end and the second end produce one with the equal-sized drive current of this reference current.
The utility model, is produced and is relevant to the drive current of data voltage, and be not subject to the impact of the critical voltage of driving transistors (being the first transistor) at least according to the first control signal by control module.
Accompanying drawing explanation
Fig. 1 is a circuit diagram, and one first preferred embodiment of the utility model picture element unit is described;
Fig. 2 is a sequential chart, and auxiliary view 1 illustrates the first preferred embodiment;
Fig. 3 is a circuit diagram, and the aspect of the first preferred embodiment at a compensated stage is described;
Fig. 4 is a circuit diagram, and the aspect of the first preferred embodiment in a glow phase is described;
Fig. 5 is a circuit diagram, and one second preferred embodiment of the utility model picture element unit is described;
Fig. 6 is a sequential chart, and auxiliary view 5 illustrates the second preferred embodiment;
Fig. 7 is a circuit diagram, and one the 3rd preferred embodiment of the utility model picture element unit is described;
Fig. 8 is a sequential chart, and auxiliary view 7 illustrates the 3rd preferred embodiment;
Fig. 9 is a circuit diagram, and one the 4th preferred embodiment of the utility model picture element unit is described;
Figure 10 is a sequential chart, auxiliary view 9 these four preferred embodiments of explanation;
Figure 11 is a circuit diagram, and one the 5th preferred embodiment of the utility model picture element unit is described;
Figure 12 is a sequential chart, and auxiliary Figure 11 illustrates the 5th preferred embodiment;
Figure 13 is a circuit diagram, and one the 6th preferred embodiment of the utility model picture element unit is described;
Figure 14 is a sequential chart, and auxiliary Figure 13 illustrates the 6th preferred embodiment;
Figure 15 is a circuit diagram, and one the 7th preferred embodiment of the utility model picture element unit is described;
Figure 16 is a sequential chart, and auxiliary Figure 15 illustrates the 7th preferred embodiment;
Figure 17 is a circuit diagram, and one the 8th preferred embodiment of the utility model picture element unit is described;
Figure 18 is a sequential chart, and auxiliary Figure 17 illustrates the 8th preferred embodiment;
Figure 19 is a circuit diagram, and one the 9th preferred embodiment of the utility model picture element unit is described;
Figure 20 is a sequential chart, and auxiliary Figure 19 illustrates the 9th preferred embodiment;
Figure 21 is a circuit diagram, and 1 the tenth preferred embodiment of the utility model picture element unit is described; And
Figure 22 is a sequential chart, and auxiliary Figure 21 illustrates the tenth preferred embodiment.
Embodiment
Consult Fig. 1, one first preferred embodiment of the utility model picture element unit, comprise a light-emitting component 901 and one drive circuit 701, light-emitting component 901 has a first end, one second end, and driving circuit 701 comprises a first transistor T1, one first switch SW 1, a capacitor C1 and a control module 801.
The first transistor T1 comprises the first end, one second end and the control end that receive one first supply voltage VDD, and definition A, B point is respectively control end and the second end of the first transistor T1.The first switch SW 1 comprise the first end, the electrical connection the first transistor T1 that are electrically connected the first supply voltage VDD control end one second end and receive a control end of one first control signal S1 (N), and according to the control of the first control signal S1 (N), determine whether to export the control end of the first supply voltage VDD to the first transistor T1.Wherein, in the display panel of the array being made up of multiple picture element unit of the present utility model, N represents the arbitrary row in display panel, for example: the first control signal S1 (2) represents the first control signal of the second row.Between the control end and the second end of capacitor C1 electrical connection the first transistor T1.The second termination of light-emitting component 901 is received a second source voltage VSS.
In the present embodiment, light-emitting component 901 is Organic Light Emitting Diode, and the first transistor T1, transistor seconds T2, the first switch SW 1, second switch SW2 and the 3rd switch SW 3 can realize with any N-type transistor (NMOS).
Fig. 2 is a sequential chart, and auxiliary view 1 illustrates the first preferred embodiment.Symbology switch or not conducting of transistor, according to first and second control signal S1 (N), S2 (N), in a compensated stage P1 and glow phase P2 operation, and are pitched to draw for convenience of description in picture element unit in following icon.
Fig. 3 is a circuit diagram, and the aspect of the first preferred embodiment at compensated stage P1 is described.Consult Fig. 2 and Fig. 3, in the time of compensated stage P1, the first control signal S1 (N) is logic high, makes first and second switch SW 1, SW2 conducting, the voltage V that A is ordered
afor VDD.The second control signal S2 (N) is logic low, makes the 3rd switch SW 3 not conductings.Transistor seconds T2 is according to the cross-pressure V of its control end and the second end
gS, 2generation is relevant to the reference current I of data voltage Data_N
rEF, and make reference current I
rEFsize and an electric current I through the first transistor T1
1and the electric current I of a process transistor seconds T2
2equal and opposite in direction (be I
rEF=I
1=I
2).Capacitor C1 stores the control end of the first transistor T1 and the cross-pressure V of the second end
gS, 1.Electric current I
1and I
2formula as follows:
I
2=K (V
gS, 2-V
tH, 2)
2=K (V
gS, 1-V
tH, 1)
2=I
1---formula one
Wherein, K is transistor constant, V
tH, 1for the critical voltage of the first transistor T1, V
tH, 2for the critical voltage of transistor seconds T2.In the present embodiment, derive and can obtain by formula one:
V
gS, 2-V
tH, 2=V
gS, 1-V
tH, 1---formula two
Derive and can obtain by formula two:
V
gS, 1=V
gS, 2-V
tH, 2+ V
tH, 1---formula three
Due to V
gS, 1the voltage V of ordering for A
adeduct the voltage V that B is ordered
b(be V
gS, 1=V
a-V
b), in the time of compensated stage P1, voltage V
afor VDD, by voltage V
awith voltage V
bband formula two, can obtain following formula:
V
gS, 2-V
tH, 2=V
a-V
b-V
tH, 1=VDD-V
b-V
tH, 1---formula four
Derive and can obtain by formula four: V
b=-V
gS, 2+ V
tH, 2+ VDD-V
tH, 1.
Fig. 4 is a circuit diagram, and the aspect of the first preferred embodiment at glow phase P2 is described.Consult Fig. 2 and Fig. 4, in the time of glow phase P2, the first control signal S1 (N) is logic low, makes first and second switch SW 1, not conducting of SW2.The second control signal S2 (N) is logic high, makes the 3rd switch SW 3 conductings.Now, the voltage V that B is ordered
b' be VSS+V
dRIVE, V
dRIVEfor the forward voltage of light-emitting component 901.Because capacitor C1 stores cross-pressure V
gS, 1, make the cross-pressure V of the first transistor T1 at glow phase P2
gS, 1' be equal to the cross-pressure V of the first transistor T1 in the time of compensated stage P1
gS, 1.Its action principle is, the change in voltage Δ V that capacitor C1 is ordered B
bbe coupled to A point, therefore, A point is at the voltage V of glow phase P2
a' can be expressed as:
V
a'=V
a+ Δ V
b=VDD+ Δ V
b---formula five
Wherein, the change in voltage Δ V that B is ordered
bcan be expressed as:
Δ V
b=V
b'-V
b=VSS+V
dRIVE-V
b---formula six
After bringing formula six into formula five, can obtain: V
a'=VDD+VSS+V
dRIVE-V
b.
Due to cross-pressure V
gS, 1' the voltage V of ordering for A
a' deduct the voltage V that B is ordered
b' (be V
gS, 1'=V
a'-V
b'), by voltage V
a' and voltage V
b' value substitution, after abbreviation, can obtain following formula:
V
gS, 1'=VDD-V
b---formula seven
By voltage V
bvalue substitution formula seven, after abbreviation, can obtain following formula:
V
gS, 1'=V
gS, 2-V
tH, 2+ V
tH, 1---formula eight
Can be proved by formula three and formula eight, the first transistor T1 is at the cross-pressure V of glow phase P2
gS, 1' be equal to the cross-pressure V of the first transistor T1 in the time of compensated stage P1
gS, 1.
The first transistor T1 is according to cross-pressure V
gS, 1' generation drive current I
dRIVE, drive current I
dRIVEthe 3rd switch SW 3 via conducting is supplied light-emitting component 901.Drive current I
dRIVEcan be by the following derivation of equation:
I
DRIVE＝K(V
GS,1'-V
TH,1)
2
=K (V
gS, 2-V
tH, 2+ V
tH, 1-V
tH, 1)
2---formula nine
＝K(V
GS,2-V
TH,2)
2＝I
1＝I
REF
From formula nine, drive current I
dRIVEwith reference current I
rEFequal and opposite in direction, and be relevant to the cross-pressure V of transistor seconds T2 in the time of compensated stage P1
gS, 2with critical voltage V
tH, 2difference.Second terminal voltage of transistor seconds T2 in the time of compensated stage P1 is data voltage Data_N again, therefore, and drive current I
dRIVEdata_N is relevant with data voltage, but drive current I
dRIVEcritical voltage V with the first transistor
tH, 1irrelevant.
Compared with conventional art, the utility model produces reference current I by transistor seconds T2
rEF, and make drive current I
dRIVEbe equal to reference current I
rEF, make drive current I
dRIVEcritical voltage V with the first transistor T1
tH, 1irrelevant, also just can not be because of the homogeneity question of the processing procedure of the first transistor T1, make the critical voltage V of the first transistor T1 of different picture elements unit
tH, 1difference, causes, in the time of identical data voltage Data, but having drive current I
dRIVEunequal phenomenon, and then improve the brightness disproportionation of panel or the problem of branding that are formed by picture element unit.
In following each embodiment, for convenience of explanation for the purpose of, on figure, do not draw reference current I
rEFand drive current I
dRIVE, but reference current I
rEFand drive current I
dRIVEdefinition respectively as shown in Figure 3 and Figure 4.
Consult Fig. 5, the second preferred embodiment of the utility model picture element unit, is similar to the first preferred embodiment haply, is also to comprise a light-emitting component 902 and one drive circuit 702, and different places are:
In driving circuit 702, the transistor seconds T2 of control module 802 has one second end of a first end of the second end of electrical connection second switch SW2, a control end that receives data voltage Data and reception one second control signal S2 (N).
Fig. 6 is a sequential chart, and auxiliary view 5 illustrates the second preferred embodiment.Consult Fig. 5 and Fig. 6, utilize the derivation similar to the first preferred embodiment known, the drive current I in the time of glow phase P2
dRIVEthe reference current I being equal at compensated stage
rEF, and, drive current I
dRIVEcan be expressed as:
I
dRIVE=I
rEF=K (V
gS, 2-V
tH, 2)
2---formula ten
Wherein, the cross-pressure V of transistor seconds T2 in the time of compensated stage P1
gS, 2data_N is relevant to data voltage.From formula ten, drive current I
dRIVEdata_N is relevant with data voltage, but drive current I
dRIVEcritical voltage V with the first transistor
tH, 1irrelevant, have advantages of identical with the first preferred embodiment.
Consult Fig. 7, the 3rd preferred embodiment of the utility model picture element unit, is similar to the first preferred embodiment haply, is also to comprise a light-emitting component 903 and one drive circuit 703, and different places are:
In driving circuit 703 the transistor seconds T2 of control module 803 have the second end of electrical connection second switch SW2 a first end, receive a control end of data voltage Data and receive one second end of the first control signal S1 (N+1) of another adjacent row.
Fig. 8 is a sequential chart, and auxiliary view 7 illustrates the 3rd preferred embodiment.Consult Fig. 7 and Fig. 8, utilize the derivation similar to the first preferred embodiment known, the drive current I in the time of glow phase P2
dRIVEthe reference current I being equal at compensated stage
rEF, and, drive current I
dRIVEcan be expressed as:
I
dRIVE=I
rEF=K (V
gS, 2-V
tH, 2)
2formula 11
Wherein, the cross-pressure V of transistor seconds T2 in the time of compensated stage P1
gS, 2dATA_N is relevant to data voltage.From formula 11, drive current I
dRIVEdATA_N is relevant with data voltage, but drive current I
dRIVEcritical voltage V with the first transistor
tH, 1irrelevant, have advantages of identical with the first preferred embodiment.
Consult Fig. 9, the 4th preferred embodiment of the utility model picture element unit, is similar to the first preferred embodiment haply, is also to comprise a light-emitting component 904 and one drive circuit 704, and different places are:
In driving circuit 704, the transistor seconds T2 of control module 804 has one second end of a first end of the second end of electrical connection second switch SW2, a control end that receives data voltage Data and reception one reference voltage VL.
Figure 10 is a sequential chart, and auxiliary view 9 illustrates the 4th preferred embodiment.Consult Fig. 9 and Figure 10, utilize the derivation similar to the first preferred embodiment known, in the time of glow phase P2, drive current I
dRIVEthe reference current I being equal at compensated stage
rEF, and, drive current I
dRIVEcan be expressed as:
I
dRIVE=I
rEF=K (V
gS, 2-V
tH, 2)
2formula 12
Wherein, the cross-pressure V of transistor seconds T2 in the time of compensated stage P1
gS, 2dATA_N is relevant to data voltage.From formula 12, drive current I
dRIVEdATA_N is relevant with data voltage, but drive current I
dRIVEcritical voltage V with the first transistor
tH, 1irrelevant, have advantages of identical with the first preferred embodiment.
Consult Figure 11, the 5th preferred embodiment of the utility model picture element unit, is similar to the first preferred embodiment haply, is also to comprise a light-emitting component 905 and one drive circuit 705, and different places are:
In driving circuit 705, the 3rd switch SW 3 of control module 805 is a P transistor npn npn (PMOS), and have a first end, the electrical connection light-emitting component 905 of the second end of electrical connection the first transistor T1 first end one second end and receive a control end of the first control signal S1 (N), and according to the control of the first control signal S1 (N), to determine whether will output to light-emitting component 905 from the drive current of the first transistor T1.
Figure 12 is a sequential chart, and auxiliary Figure 11 illustrates the 5th preferred embodiment.Consult Figure 11 and Figure 12, in the time of compensated stage P1, the first control signal S1 (N) is logic high, makes first and second switch SW 1, SW2 conducting, and makes the 3rd switch SW 3 not conductings.In the time of glow phase P2, the first control signal S1 (N) is logic low, makes first and second switch SW 1, not conducting of SW2, and makes the 3rd switch SW 3 conductings.
Consult Figure 13, the 6th preferred embodiment of the utility model picture element unit, is similar to the 3rd preferred embodiment haply, is also to comprise a light-emitting component 906 and one drive circuit 706, and different places are:
In driving circuit 706, the 3rd switch SW 3 of control module 806 is a P transistor npn npn (PMOS), and have a first end, the electrical connection light-emitting component 906 of the second end of electrical connection the first transistor T1 first end one second end and receive a control end of the first control signal S1 (N), and according to the control of the first control signal S1 (N), to determine whether will output to light-emitting component 906 from the drive current of the first transistor T1.
Figure 14 is a sequential chart, and auxiliary Figure 13 illustrates the 6th preferred embodiment.Consult Figure 13 and Figure 14, in the time of compensated stage P1, the first control signal S1 (N) is logic high, makes first and second switch SW 1, SW2 conducting, and makes the 3rd switch SW 3 not conductings.In the time of glow phase P2, the first control signal S1 (N) is logic low, makes first and second switch SW 1, not conducting of SW2, and makes the 3rd switch SW 3 conductings.
Consult Figure 15, the 7th preferred embodiment of the utility model picture element unit, is similar to the 4th preferred embodiment haply, is also to comprise a light-emitting component 907 and one drive circuit 707, and different places are:
In driving circuit 707, the 3rd switch SW 3 of control module 807 is a P transistor npn npn (PMOS), and have a first end, the electrical connection light-emitting component 907 of the second end of electrical connection the first transistor T1 first end one second end and receive a control end of the first control signal S1 (N), and according to the control of the first control signal S1 (N), to determine whether will output to light-emitting component 907 from the drive current of the first transistor T1.
Figure 16 is a sequential chart, and auxiliary Figure 15 illustrates the 7th preferred embodiment.Consult Figure 15 and Figure 16, in the time of compensated stage P1, the first control signal S1 (N) is logic high, makes first and second switch SW 1, SW2 conducting, and makes the 3rd switch SW 3 not conductings.In the time of glow phase P2, the first control signal S1 (N) is logic low, makes first and second switch SW 1, not conducting of SW2, and makes the 3rd switch SW 3 conductings.
Consult Figure 17, the 8th preferred embodiment of the utility model picture element unit, is similar to the first preferred embodiment haply, is also to comprise a light-emitting component 908 and one drive circuit 708, and different places are:
In driving circuit 708, control module 808 is omitted the 3rd switch SW 3 (seeing Fig. 1), and the second end that second switch SW2 has an electrical connection the first transistor T1 is connected a control end of the first end of transistor seconds T2 and the second end of control end and reception the first control signal S1 (N) with a first end, of the first end of light-emitting component 908, and according to the control of the first control signal S1 (N), between conducting and not conducting, switch.
Figure 18 is a sequential chart, and auxiliary Figure 17 illustrates the 8th preferred embodiment.Consult Figure 17 and Figure 18, picture element unit is according to the first control signal S1 (N), in a compensated stage P1 and glow phase P2 operation, and in the time of compensated stage P1, the cross-pressure of the first end of light-emitting component 908 and the second end need be less than the forward voltage V of light-emitting component 908
dRIVE, i.e. V
b-VSS<V
dRIVE.
Consult Figure 19, the 9th preferred embodiment of the utility model picture element unit, is similar to the 3rd preferred embodiment haply, is also to comprise a light-emitting component 909 and one drive circuit 709, and different places are:
In driving circuit 709, control module 809 is omitted the 3rd switch SW 3 (seeing Fig. 7), and the second end that second switch SW2 has an electrical connection the first transistor T1 is connected the second end of first end and a control end of reception the first control signal S1 (N) of transistor seconds T2 with a first end, of the first end of light-emitting component 909, and according to the control of the first control signal S1 (N), between conducting and not conducting, switch.
Figure 20 is a sequential chart, and auxiliary Figure 19 illustrates the 9th preferred embodiment.Consult Figure 19 and Figure 20, picture element unit is according to the first control signal S1 (N+1) of the first control signal S1 (N) and adjacent another row, in a compensated stage P1 and glow phase P2 operation, and in the time of compensated stage P1, the cross-pressure of the first end of light-emitting component 909 and the second end need be less than the forward voltage V of light-emitting component 909
dRIVE, i.e. V
b-VSS<V
dRIVE.
Consult Figure 21, the tenth preferred embodiment of the utility model picture element unit, is similar to the 4th preferred embodiment haply, is also to comprise a light-emitting component 910 and one drive circuit 710, and different places are:
In driving circuit 710, control module 810 is omitted the 3rd switch SW 3 (seeing Fig. 9), and the second end that second switch SW2 has an electrical connection the first transistor T1 is connected the second end of first end and a control end of reception the first control signal S1 (N) of transistor seconds T2 with a first end, of the first end of light-emitting component 910, and according to the control of the first control signal S1 (N), between conducting and not conducting, switch.
Figure 22 is a sequential chart, and auxiliary Figure 21 illustrates the tenth preferred embodiment.Consult Figure 21 and Figure 22, picture element unit is according to the first control signal S1 (N), in a compensated stage P1 and glow phase P2 operation, and in the time of compensated stage P1, the cross-pressure of the first end of light-emitting component 910 and the second end need be less than the forward voltage V of light-emitting component 910
dRIVE, i.e. V
b-VSS<V
dRIVE.
From above each embodiment, at least according to the first control signal S1 (N), can produce the drive current I that is relevant to data voltage Data by control module 801～810
dRIVE, and be not subject to the critical voltage V of the first transistor T1
tH, 1impact.That is to say, can be because of the homogeneity question of the processing procedure of driving transistors (being the first transistor T1 at above embodiment), make the critical voltage difference of the driving transistors of different picture elements unit, cause in the time giving identical data voltage, but there is the unequal phenomenon of corresponding drive current, and then improve the brightness disproportionation of panel or the problem of branding that are formed by picture element unit.
Claims (15)
1. a picture element unit, comprises a light-emitting component, and this light-emitting component has a first end and one second end; It is characterized in that: this picture element unit also comprises:
One drive circuit, comprising:
One the first transistor, comprises a first end, one second end and a control end;
One first switch, comprise and be electrically connected a first end of one first supply voltage, one second end of control end that is electrically connected this first transistor and a control end of reception one first control signal, and according to the control of this first control signal, determine whether to export the control end of this first supply voltage to this first transistor;
One capacitor, is electrically connected between the control end and the second end of this first transistor; And
One control module, be electrically connected between the second end of this first transistor and the first end of this light-emitting component, and receive a data voltage and this first control signal, and at least according to the control of this first control signal, determine whether to produce one and be relevant to this data voltage and the reference current through this first transistor, make the cross-pressure between control end and second end of this first transistor be relevant to this reference current, this first transistor according to the cross-pressure between its control end and the second end produce one with the equal-sized drive current of this reference current.
2. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, has a first end and a control end of the second end that is electrically connected respectively this second switch, and receives one second end of this data voltage; And
One the 3rd switch, there is a first end of the second end of this first transistor of electrical connection, one second end of first end that is electrically connected this light-emitting component and a control end of reception one second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
3. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of one second control signal; And
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
4. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of the first control signal of another row; And
One the 3rd switch, there is a first end of the second end of this first transistor of electrical connection, one second end of first end that is electrically connected this light-emitting component and a control end of reception one second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
5. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of a reference voltage; And
One the 3rd switch, there is a first end of the second end of this first transistor of electrical connection, one second end of first end that is electrically connected this light-emitting component and a control end of reception one second control signal, and according to the control of this second control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
6. according to the picture element unit described in claim 2,3,4 or 5, it is characterized in that: according to this first and second control signal, operate at a compensated stage and a glow phase:
In the time of this compensated stage, this first control signal makes this first and second switch conduction, this second control signal makes the 3rd not conducting of switch, make this transistor seconds produce this to be relevant to the reference current of this data voltage, this the first transistor is adjusted the cross-pressure between its control end and the second end according to this reference current, and this cross-pressure of this capacitor stores is as a stored voltage; And
When this glow phase after this compensated stage, this first control signal makes this first and second not conducting of switch, this second control signal makes the 3rd switch conduction, this the first transistor produces this drive current according to this stored voltage, and this drive current supplies via the 3rd switch of conducting should light-emitting component.
7. picture element according to claim 1 unit, its feature is levied and is: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, has a first end and a control end of the second end that is electrically connected respectively this second switch, and receives one second end of this data voltage; And
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this first control signal, and according to the control of this first control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
8. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of the first control signal of another row; And
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this first control signal, and according to the control of this first control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
9. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, have this first transistor of electrical connection the second end a first end, one second end and receive a control end of this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch;
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of a reference voltage; And
One the 3rd switch, have the second end of this first transistor of electrical connection a first end, be electrically connected this light-emitting component first end one second end and receive a control end of this first control signal, and according to the control of this first control signal, to determine whether will output to this light-emitting component from the drive current of this first transistor.
10. according to the picture element unit described in claim 7,8 or 9, it is characterized in that: according to this first control signal, operate at a compensated stage and a glow phase:
In the time of this compensated stage, this first control signal makes this first and second switch conduction, and make the 3rd not conducting of switch, this transistor seconds produces this and is relevant to the reference current of this data voltage, this the first transistor is adjusted the cross-pressure between its control end and the second end according to this reference current, and this cross-pressure of this capacitor stores is as a stored voltage; And
When this glow phase after this compensated stage, this first control signal makes this first and second not conducting of switch, and make the 3rd switch conduction, and this first transistor produces this drive current according to this stored voltage, and this drive current supplies via the 3rd switch of conducting should light-emitting component.
11. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, there is a first end, one second end that is electrically connected the second end of this first transistor and the first end of this light-emitting component and a control end that receives this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch; And
One transistor seconds, has a first end and a control end of the second end that is electrically connected respectively this second switch, and receives one second end of this data voltage.
12. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, there is a first end, one second end that is electrically connected the second end of this first transistor and the first end of this light-emitting component and a control end that receives this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch; And
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of the first control signal of another row.
13. picture element according to claim 1 unit, is characterized in that: the first end of this first transistor receives this first supply voltage, and this control module comprises:
One second switch, there is a first end, one second end that is electrically connected the second end of this first transistor and the first end of this light-emitting component and a control end that receives this first control signal, and according to the control of this first control signal, between conducting and not conducting, switch; And
One transistor seconds, have the second end of this second switch of electrical connection a first end, receive a control end of this data voltage and receive one second end of a reference voltage.
14. according to the picture element unit described in claim 11,12 or 13, it is characterized in that: the second termination of this light-emitting component is received a second source voltage, according to this first control signal, operates at a compensated stage and a glow phase:
In the time of this compensated stage, this first control signal makes this first and second switch conduction, make this transistor seconds produce this to be relevant to the reference current of this data voltage, this the first transistor is adjusted the cross-pressure between its control end and the second end according to this reference current, this cross-pressure of this capacitor stores is as a stored voltage, and the voltage of the second end of this first transistor and the difference of this second source voltage are less than the forward voltage of this light-emitting component; And
When this glow phase after this compensated stage, this first control signal makes this first and second not conducting of switch, and this first transistor produces this drive current for should light-emitting component according to this stored voltage.
15. 1 kinds of driving circuits, is characterized in that: this driving circuit comprises:
One the first transistor, comprises a first end, one second end and a control end;
One first switch, comprise and be electrically connected a first end of one first supply voltage, one second end of control end that is electrically connected this first transistor and a control end of reception one first control signal, and according to the control of this first control signal, determine whether to export the control end of this first supply voltage to this first transistor;
One capacitor, is electrically connected between the control end and the second end of this first transistor; And
One control module, be electrically connected on the second end of this first transistor, and receive a data voltage and this first control signal, and at least according to the control of this first control signal, determine whether to produce one and be relevant to this data voltage and the reference current through this first transistor, make the cross-pressure between control end and second end of this first transistor be relevant to this reference current, this first transistor according to the cross-pressure between its control end and the second end produce one with the equal-sized drive current of this reference current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320703919.8U CN203607085U (en) | 2013-11-07 | 2013-11-07 | Picture element unit and drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320703919.8U CN203607085U (en) | 2013-11-07 | 2013-11-07 | Picture element unit and drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203607085U true CN203607085U (en) | 2014-05-21 |
Family
ID=50719748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320703919.8U Withdrawn - After Issue CN203607085U (en) | 2013-11-07 | 2013-11-07 | Picture element unit and drive circuit |
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| Country | Link |
|---|---|
| CN (1) | CN203607085U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637432A (en) * | 2013-11-07 | 2015-05-20 | 宸鸿光电科技股份有限公司 | Pixel unit and drive circuit |
-
2013
- 2013-11-07 CN CN201320703919.8U patent/CN203607085U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637432A (en) * | 2013-11-07 | 2015-05-20 | 宸鸿光电科技股份有限公司 | Pixel unit and drive circuit |
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