CN104575381A - OLED pixel and drive circuit and method thereof - Google Patents
OLED pixel and drive circuit and method thereof Download PDFInfo
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- CN104575381A CN104575381A CN201510005666.0A CN201510005666A CN104575381A CN 104575381 A CN104575381 A CN 104575381A CN 201510005666 A CN201510005666 A CN 201510005666A CN 104575381 A CN104575381 A CN 104575381A
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Abstract
The invention provides an OLED pixel and a drive circuit and method of the OLED pixel. The OLED pixel comprises three sub-pixel units. Each sub-pixel unit comprises two sub-pixels, wherein the area ratio of the two sub-pixels is 2:1. Each sub-pixel unit is driven by two gate electrode wires. The drive circuit of the OLED pixel is a simple circuit of a 2T1C structure, and multiple colors can be achieved by controlling drive current of the gate electrode wires. The OLED pixel and the drive circuit and method of the OLED pixel have the advantages that no compensation circuit is required, the complexity of the drive circuit and the overall cost are lowered, and the yield of the drive circuit is improved; meanwhile, each OLED pixel at least can achieve 4,096 colors by controlling drive scanning frequency and the drive current of the gate electrode wires.
Description
Technical field
The invention belongs to technical field of semiconductors, in particular to driving circuit and the driving method of a kind of OLED pixel and this pixel.
Background technology
OLED display technique has self luminous characteristic, and OLED display screen curtain visible angle is large, and can save electric energy, and therefore OLED is widely used in the fields such as Display panel.Existing OLED drives and have employed compensating circuit, and this makes driving circuit become complicated, also can reduce yield.And OLED driving is all analog-driven, causes holistic cost to rise.
Therefore, while raising driving circuit yield, the complexity that can reduce costs again, simplify driving circuit is urgently to be resolved hurrily.
Summary of the invention
For solving the problem, the object of the present invention is to provide driving circuit and the driving method of a kind of OLED pixel and this pixel.
The invention provides a kind of OLED pixel, it is characterized in that, an OLED pixel comprises:
First sub-pixel unit, the first described sub-pixel unit comprises the first sub-pixel R1 and the 4th sub-pixel R2;
Second sub-pixel unit, the second described sub-pixel unit comprises the second sub-pixel G1 and the 5th sub-pixel G2;
3rd sub-pixel unit, the 3rd described sub-pixel unit comprises the 3rd sub-pixel B1 and the 6th sub-pixel B2;
The area equation of the area of the first described sub-pixel R1, the area of the second described sub-pixel G1 and the 3rd described sub-pixel B1;
The area equation of the area of the 4th described sub-pixel R2, the area of the 5th described sub-pixel G2 and the 6th described sub-pixel B2;
The area of the first described sub-pixel R1 is the twice of the area of the 4th described sub-pixel R2, the area G1 of the second described sub-pixel is the twice of the area of the 5th described sub-pixel G2, and the area of the 3rd described sub-pixel B1 is the twice of the area of the 6th described sub-pixel B2;
The first described sub-pixel R1, the second described sub-pixel G1 and the 3rd described sub-pixel B1 are driven by first grid electrode wires;
The 4th described sub-pixel R2, the 5th described sub-pixel G2 and the 6th described sub-pixel B2 are driven by second gate electrode wires.
Further improve as the present invention, the first described sub-pixel R1 and the 4th described sub-pixel R2 is red, and the second described sub-pixel G1 and the 5th described sub-pixel G2 is green, and the 3rd described sub-pixel B1 and the 6th described sub-pixel B2 is blue.
Present invention also offers a kind of OLED pixel-driving circuit, the corresponding driving circuit of each sub-pixel unit, comprising:
The first transistor M1, the grid of described the first transistor M1 is connected with first grid electrode wires Gate1, and the drain electrode of described the first transistor M1 is connected with signal wire Data, and the source electrode of described the first transistor M1 connects first node A;
Transistor seconds M2, the grid of described transistor seconds M2 connects first node A, the drain electrode of described transistor seconds M2 connects Section Point B, and the source electrode of described transistor seconds M2 connects the anode a1 of an OLED luminescence unit, the negative electrode c1 ground connection of a described OLED luminescence unit;
The grid of third transistor M3, described third transistor M3 is connected with second gate electrode wires Gate2, and the drain electrode of described third transistor M3 is connected with signal wire Data, and the source electrode of described third transistor M3 connects the 3rd node C;
4th transistor M4, the grid of the 4th described transistor M4 connects the 3rd node C, the drain electrode of the 4th described transistor M4 connects the anode a2 of source electrode connection the 2nd OLED luminescence unit of the 4th node D, the 4th described transistor M4, the negative electrode c2 ground connection of the 2nd described OLED luminescence unit;
First electric capacity C1, the first described electric capacity C1 is connected between first node A and Section Point B;
First electric capacity C2, the first described electric capacity C2 is connected between first node C and Section Point D;
Section Point B is all connected with power lead ELVDD with the 4th node D.
Present invention also offers a kind of OLED image element driving method, the driving sweep frequency of first grid electrode wires Gate1 and second gate electrode wires Gate2 is divided into n part, the drive current of Part I is I, and the drive current of the n-th part is 4
n-1i, wherein n is integer and n>=2.
Further improve as the present invention, each OLED pixel at least can realize 4096 kinds of colors.
Beneficial effect of the present invention is:
1, each sub-pixel unit divides 2 parts, area ratio 2:1, the driving circuit structure of this sub-pixel unit adopts simple 2T1C structure simultaneously, does not need compensating circuit, reduce the complicacy of driving circuit and the cost of entirety, and improve the yield of driving circuit.
2, by driving sweep frequency and the drive current of control grid electrode line, each OLED pixel at least can realize 4096 kinds of colors.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of OLED pixel of the present invention;
Fig. 2 is the structural representation of the driving circuit of a kind of OLED pixel of the present invention.
Fig. 3 is the schematic diagram of a kind of OLED image element driving method of the present invention.
Fig. 4 is the schematic diagram of another embodiment of a kind of OLED image element driving method of the present invention.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
As shown in Figure 1, the invention provides a kind of OLED pixel, comprising:
First sub-pixel unit, comprises the first sub-pixel R1 and the 4th sub-pixel R2;
Second sub-pixel unit, comprises the second sub-pixel G1 and the 5th sub-pixel G2;
3rd sub-pixel unit, comprises the 3rd sub-pixel B1 and the 6th sub-pixel B2;
The area equation of the area of the first sub-pixel R1, the area of the second sub-pixel G1 and the 3rd sub-pixel B1;
The area equation of the area of the 4th sub-pixel R2, the area of the 5th sub-pixel G2 and the 6th sub-pixel B2;
The area of the first sub-pixel R1 is the twice of the area of the 4th sub-pixel R2, and the area G1 of the second sub-pixel is the twice of the area of the 5th sub-pixel G2, and the area of the 3rd sub-pixel B1 is the twice of the area of the 6th sub-pixel B2;
First sub-pixel R1, the second sub-pixel G1 and the 3rd sub-pixel B1 are driven by first grid electrode wires;
4th sub-pixel R2, the 5th sub-pixel G2 and the 6th sub-pixel B2 are driven by second gate electrode wires.
Further, the first sub-pixel R1 and the 4th sub-pixel R2 is red, and the second sub-pixel G1 and the 5th sub-pixel G2 is green, and the 3rd sub-pixel B1 and the 6th sub-pixel B2 is blue.
As shown in Figure 2, present invention also offers a kind of driving circuit of OLED pixel, all corresponding driving circuit of each sub-pixel unit.
The grid of the first transistor M1 is connected with first grid electrode wires Gate1, and the drain electrode of the first transistor M1 is connected with signal wire Data, and the source electrode of the first transistor M1 connects first node A;
The grid of transistor seconds M2 connects first node A, and the drain electrode of transistor seconds M2 connects Section Point B, and the source electrode of transistor seconds M2 connects the anode a1 of an OLED luminescence unit, the negative electrode c1 ground connection of an OLED luminescence unit;
The grid of third transistor M3 is connected with second gate electrode wires Gate2, and the drain electrode of third transistor M3 is connected with signal wire Date, and the source electrode of third transistor M3 connects the 3rd node C;
The grid of the 4th transistor M4 connects the anode a2 of source electrode connection the 2nd OLED luminescence unit of drain electrode connection the 4th node D, the 4th transistor M4 of the 3rd node C, the 4th transistor M4, the negative electrode c2 ground connection of the 2nd OLED luminescence unit;
First electric capacity C1 is connected between first node A and Section Point B;
First electric capacity C2 is connected between first node C and Section Point D;
Section Point B is all connected with power lead ELVDD with the 4th node D.
When first grid electrode wires Gate1 is effective, the first transistor M1 opens, by the signal storage of signal wire Data to the first electric capacity C1, the voltage signal that first electric capacity C1 stores controls the conducting of transistor seconds M2, and the current signal that the voltage signal of input being converted to OLED luminescence needs carrys out the color of driving OLED Display Realization.
When second gate electrode wires Gate2 is effective, third transistor M3 opens, by the signal storage of signal wire Data to the second electric capacity C2, the voltage signal that second electric capacity C2 stores controls the conducting of the 4th transistor M4, and the current signal that the voltage signal of input being converted to OLED luminescence needs carrys out the color of driving OLED Display Realization.
The present invention also provides a kind of driving method of driving OLED sub-pixel unit, and the driving sweep frequency of first grid electrode wires Gate1 and second gate electrode wires Gate2 is divided into n part, and the drive current of Part I is I, and the drive current of the n-th part is 4
n-1i, wherein n is integer and n>=2.
As shown in Figure 3, driving circuit is when each sub-pixel unit of driving OLED pixel realizes different colors, and two parts up and down of each sub-pixel unit can have four kinds of open/close modes, i.e. shangguan, ShiShimonoseki; Shangguan, under open; On open, ShiShimonoseki; On open, under open.The driving sweep frequency of first grid electrode wires Gate1 and second gate electrode wires Gate2 is 120HZ, drives sweep frequency to be divided into two parts this, and the driving sweep frequency of every part is 60HZ.The drive current of Part I is I, four kinds of on-off modes can realize 0,1,2,3 these 4 kinds of current values, the drive current of Part II is 4I, four kinds of on-off modes can realize 0,4,8,12 these 4 kinds of current values, therefore a sub-pixel unit drives the words of combination can realize 0 ~ 15 kind of mode, amounts to 16 kinds of modes.An OLED pixel has three sub-pixel unit, and the number of colours that can realize is 16
3kind, amount to 4096 kinds of colors.
As shown in Figure 4, driving circuit is when each sub-pixel unit of driving OLED pixel realizes different colors, and two parts up and down of each sub-pixel unit can have four kinds of open/close modes, i.e. shangguan, ShiShimonoseki; Shangguan, under open; On open, ShiShimonoseki; On open, under open.The driving sweep frequency of first grid electrode wires Gate1 and second gate electrode wires Gate2 is 180HZ, drives sweep frequency to be divided into three parts this, and the driving sweep frequency of every part is 60HZ.The drive current of Part I is I, four kinds of on-off modes can realize 0,1,2,3 these 4 kinds of current values, the drive current of Part II is 4I, four kinds of on-off modes can realize 0,4,8,12 these 4 kinds of current values, the drive current of Part III is 16I, four kinds of on-off modes can realize 0,16,32,48 these 4 kinds of current values, and therefore a sub-pixel unit drives the words of combination can realize 0 ~ 63 kind of mode, amounts to 64 kinds of modes.An OLED pixel has three sub-pixel unit, and the number of colours that can realize is 643 kinds, amounts to 262144 kinds of colors.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. an OLED pixel, is characterized in that, an OLED pixel comprises:
First sub-pixel unit, the first described sub-pixel unit comprises the first sub-pixel (R1) and the 4th sub-pixel (R2);
Second sub-pixel unit, the second described sub-pixel unit comprises the second sub-pixel (G1) and the 5th sub-pixel (G2);
3rd sub-pixel unit, the 3rd described sub-pixel unit comprises the 3rd sub-pixel (B1) and the 6th sub-pixel (B2);
The area equation of the area of described the first sub-pixel (R1), the area of described the second sub-pixel (G1) and the 3rd described sub-pixel (B1);
The area equation of the area of the 4th described sub-pixel (R2), the area of the 5th described sub-pixel (G2) and the 6th described sub-pixel (B2);
The area of described the first sub-pixel (R1) is the twice of the area of the 4th described sub-pixel (R2), the area (G1) of the second described sub-pixel is the twice of the area of the 5th described sub-pixel (G2), and the area of the 3rd described sub-pixel (B1) is the twice of the area of the 6th described sub-pixel (B2);
Described the first sub-pixel (R1), described the second sub-pixel (G1) and the 3rd described sub-pixel (B1) are driven by first grid electrode wires;
The 4th described sub-pixel (R2), the 5th described sub-pixel (G2) and the 6th described sub-pixel (B2) are driven by second gate electrode wires.
2. a kind of OLED pixel according to claim 1, it is characterized in that, described the first sub-pixel (R1) and the 4th described sub-pixel (R2) are red, described the second sub-pixel (G1) and the 5th described sub-pixel (G2) are green, and the 3rd described sub-pixel (B1) and the 6th described sub-pixel (B2) are blue.
3. drive a driving circuit for OLED pixel as claimed in claim 1, it is characterized in that, the corresponding driving circuit of each sub-pixel unit, comprising:
The first transistor (M1), the grid of described the first transistor (M1) is connected with first grid electrode wires (Gate1), the drain electrode of described the first transistor (M1) is connected with signal wire (Data), and the source electrode of described the first transistor (M1) connects first node (A);
Transistor seconds (M2), the grid of described transistor seconds (M2) connects first node (A), the drain electrode of described transistor seconds (M2) connects Section Point (B), the source electrode of described transistor seconds (M2) connects the anode (a1) of an OLED luminescence unit, negative electrode (c1) ground connection of a described OLED luminescence unit;
Third transistor (M3), the grid of described third transistor (M3) is connected with second gate electrode wires (Gate2), the drain electrode of described third transistor (M3) is connected with signal wire (Data), and the source electrode of described third transistor (M3) connects the 3rd node (C);
4th transistor (M4), the grid of the 4th described transistor (M4) connects the 3rd node (C), the drain electrode of the 4th described transistor (M4) connects the 4th node (D), the source electrode of the 4th transistor (M4) connects the anode (a2) of the 2nd OLED luminescence unit, negative electrode (c2) ground connection of the 2nd described OLED luminescence unit;
First electric capacity (C1), described the first electric capacity (C1) is connected between first node (A) and Section Point (B);
First electric capacity (C2), described the first electric capacity (C2) is connected between first node (C) and Section Point (D);
Section Point (B) is all connected with power lead ELVDD with the 4th node (D).
4. one kind utilizes the OLED image element driving method of OLED pixel-driving circuit as claimed in claim 3, it is characterized in that, the driving sweep frequency of first grid electrode wires (Gate1) and second gate electrode wires (Gate2) is divided into n part, the drive current of Part I is I, and the drive current of the n-th part is 4
n-1i, wherein n is integer and n>=2.
5. OLED image element driving method according to claim 4, is characterized in that, each OLED pixel at least can realize 4096 kinds of colors.
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| CN201510005666.0A CN104575381A (en) | 2015-01-05 | 2015-01-05 | OLED pixel and drive circuit and method thereof |
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| CN109272938A (en) * | 2018-11-23 | 2019-01-25 | 京东方科技集团股份有限公司 | Display screen, pixel circuit unit and its control method |
| CN110890066A (en) * | 2019-11-26 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | Sub-pixel circuit, pixel circuit and display device |
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