CN105185321A - AMOLED (active matrix/organic light emitting diode) drive circuit, display panel and display - Google Patents

AMOLED (active matrix/organic light emitting diode) drive circuit, display panel and display Download PDF

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Publication number
CN105185321A
CN105185321A CN201510708122.0A CN201510708122A CN105185321A CN 105185321 A CN105185321 A CN 105185321A CN 201510708122 A CN201510708122 A CN 201510708122A CN 105185321 A CN105185321 A CN 105185321A
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oled
driving circuit
film transistor
amoled
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CN105185321B (en
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徐向阳
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Abstract

The invention discloses an AMOLED (active matrix/organic light emitting diode) drive circuit, a display panel and a display. The AMOLED drive circuit comprises a capacitor, a first thin film transistor, a second thin film transistor, a first OLED (organic light emitting diode) and a second OLED, wherein the first thin film transistor comprises a first grid, a first source and a first drain, the first grid is connected with a scanning signal line, the first source is connected with a signal line, and the first drain is connected with the capacitor; the second thin film transistor comprises a second grid, a second source and a second drain, the second grid is connected with the first drain, the second source is connected with a first level, and the second drain is connected with a second level; the first OLED and the second OLED are located between the sources of the first thin film transistor and the second thin film transistor and arranged in parallel, the polarities of the first OLED and the second OLED are opposite, the size relation between the first level and the second level is alternatively varied in adjacent two frame times, and the first OLED and the second OLED are alternatively conducted in adjacent two frame times. According to the invention, two OLEDs which are opposite in polarity are arranged in the AMOLED drive circuit, and the two OLEDs alternatively emit light, so that the thin film transistors are driven to work in an alternating-current mode, and then driven to be subjected to Vth drift caused by direct-current bias.

Description

AMOLED driving circuit, display panel and display
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of AMOLED driving circuit, display panel and display.
Background technology
As display technique of new generation, AMOLED (Active-matrixorganiclightemittingdiode, active matrix organic light-emitting diode or active-matrix organic light emitting diode) there is the advantages such as low-power consumption, high colour gamut, high brightness, high resolving power, wide viewing angle, high response speed, therefore enjoy the favor in market.
In TFTLCD, brightness is by voltage-controlled, as long as by the precision controlling of pixel voltage to several millivolt, just can limit unevenness in required pact ± 1% scope.This is easy to reach, because in TFTLCD, pixel TFT does not need to convert transmitted signal voltage, is only used as the switch be directly sent to from data line by signal voltage pixel.And in AMOLED, brightness is determined by the electric current flowing through OLED self, still require unevenness to be controlled in the scope of about ± 1%, this means to require the Current Control of OLED in the scope of about ± 1%.Due to the existing IC circuit of major part all transmission voltage signals, instead of current signal, so AMOLED pixel will complete a difficult task, change current signal into by voltage signal, then this is changed result and be stored in pixel within the cycle of a frame.Actual AMOLED pixel evolution proves, this is being difficult to of a task, uniform not in space distribution for the threshold voltage of the LTPSTFTs of AMOLED and channel mobility, can offset in time for the threshold voltage of a-SiTFTs of AMOLED and mobility, these shortcomings can cause unevenness and the instability of brightness of display screen.For this reason, need to introduce various pixel compensation circuit, make the homogeneity of display screen luminosity and stability meet commodity requirement, make AMOLED driving circuit comparatively complicated, and add process costs.
Therefore, for above-mentioned technical matters, be necessary to provide a kind of AMOLED driving circuit, display panel and display.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of the present invention is to provide a kind of AMOLED driving circuit, display panel and display.
To achieve these goals, the technical scheme that provides of the embodiment of the present invention is as follows:
A kind of AMOLED driving circuit, comprising:
Electric capacity;
The first film transistor, comprises the first grid be connected with scan signal line, the first source electrode be connected with signal line and first draining of being connected with electric capacity;
Second thin film transistor (TFT), comprises to drain with first second grid be connected, the second source electrode be connected with the first level and second draining of being connected with second electrical level;
Described AMOLED driving circuit also to comprise between the first level and the source electrode of the second thin film transistor (TFT) and the OLED be arranged in parallel and the 2nd OLED, the polarity of a described OLED and the 2nd OLED is contrary, magnitude relationship alternately change in adjacent two frame times of described first level and second electrical level, an OLED and the 2nd OLED alternate conduction in adjacent two frame times.
As a further improvement on the present invention, described AMOLED driving circuit comprises:
First state, the first level higher than second electrical level, an OLED conducting, the 2nd OLED cut-off;
Second state, the first level is lower than second electrical level, and the 2nd OLED conducting, an OLED ends.
As a further improvement on the present invention, under described first state, under the difference of the first level and second electrical level and described second state, second electrical level is equal with the difference of the first level.
As a further improvement on the present invention, described first level is periodically variable high level and low level, and second electrical level is the constant level in the first level between high level and low level.
As a further improvement on the present invention, described second electrical level is periodically variable high level and low level, and the first level is the constant level in second electrical level between high level and low level.
As a further improvement on the present invention, described first level is periodically variable high level and low level, and second electrical level is periodically variable low level and high level.
As a further improvement on the present invention, the first state of described AMOLED driving circuit and the second state are respectively the state of odd-numbered frame and even frame, and an OLED and the 2nd OLED is the frame period.
As a further improvement on the present invention, one end of described electric capacity and first of the first film transistor drains and is connected, the other end ground connection of electric capacity.
Correspondingly, a kind of display panel, described display panel comprises pixel layer, and pixel layer comprises scan signal line and the signal line of the setting of some arrays, described pixel layer is provided with above-mentioned AMOLED driving circuit.
Correspondingly, a kind of display, described display comprises above-mentioned display panel.
The present invention arranges two opposite polarity OLED in AMOLED driving circuit, two OLED replace under luminescence makes to drive thin film transistor (TFT) to be operated in AC mode, and then overcome the driving transistors Vth that direct current (DC) bias causes and drift about, exchange the serviceable life driving and also can extend OLED simultaneously.
Accompanying drawing explanation
Fig. 1 is AMOLED driving circuit schematic diagram in prior art.
Fig. 2 is AMOLED driving circuit schematic diagram in the present invention one preferred implementation.
Fig. 3 is the sequential chart of AMOLED driving circuit in the present invention one preferred implementation.
Fig. 4 is the luminous schematic diagram of AMOLED odd-numbered frame in the present invention one preferred implementation.
Fig. 5 is the luminous schematic diagram of AMOLED even frame in the present invention one preferred implementation.
Embodiment
Technical scheme in the present invention is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Ginseng Figure 1 shows that AMOLED driving circuit of the prior art, and this driving circuit comprises two thin film transistor (TFT)s (TFT1 and TFT2) and an electric capacity C, wherein:
The grid of the first film transistor TFT1 is connected with the n-th line scan signal line Gaten of transverse direction, and source electrode is connected with the n-th row signal line Datan of longitudinal direction, drains to be connected with one end of electric capacity C;
The grid of the second thin film transistor (TFT) TFT2 is connected with the drain electrode of the first film transistor TFT1, source electrode is connected with high level Vdd, drain electrode is low level ground connection, wherein, OLED is provided with between high level Vdd and the source electrode of the second thin film transistor (TFT) TFT2, this OLED can from Vdd to the second thin film transistor (TFT) TFT2 forward conduction, and high level Vdd is OLED drive wire;
One end of electric capacity C is connected with the drain electrode of the first film transistor TFT1, other end ground connection, and electric capacity C is mainly used for storing Data signal gray scale voltage and then controlling the second thin film transistor (TFT) TFT2 to the drive current of OLED.
But in the AMOLED driving circuit of Fig. 1, the drift of TFTVth drives OLED and has a certain impact, the present invention proposes a kind of AMOLED driving circuit, on the circuit base of 2T1C, increase an opposite polarity OLED, alternately luminous by controlling two opposite polarity OLED, under driving transistors TFT is operated in AC signal, and then avoid the drift of Vth under direct current (DC) bias, thus improve OLED GTG and picture homogeneity, exchange the serviceable life driving and also can extend OLED simultaneously.
Shown in ginseng Fig. 2, in a preferred implementation of the present invention, AMOLED driving circuit comprises:
The grid of the first film transistor TFT1, the first film transistor TFT1 is connected with the n-th line scan signal line Gaten of transverse direction, and source electrode is connected with the n-th row signal line Datan of longitudinal direction, drains to be connected with one end of electric capacity C;
The grid of the second thin film transistor (TFT) TFT2, the second thin film transistor (TFT) TFT2 is connected with the drain electrode of the first film transistor TFT1, and source electrode is connected with the first level V1, drains to be connected with second electrical level V0;
One end of electric capacity C, electric capacity C is connected with the drain electrode of the first film transistor TFT1, other end ground connection, and electric capacity C is mainly used for storing Data signal gray scale voltage and then controlling the second thin film transistor (TFT) TFT2 to the drive current of OLED.
Wherein, AMOLED driving circuit also to comprise between the first level V1 and the source electrode of the second thin film transistor (TFT) TFT2 and the OLED (OLED1) be arranged in parallel and the 2nd OLED (OLED2), the polarity of OLED1 and OLED2 is contrary, magnitude relationship alternately change in adjacent two frame times of the first level V1 and second electrical level V0, an OLED and the 2nd OLED alternate conduction in adjacent two frame times.
AMOLED driving circuit comprises two states:
First state, the first level V1 higher than second electrical level V0, then OLED (OLED1) conducting, the 2nd OLED (OLED2) cut-off;
Second state, the first level V1 is lower than second electrical level V0, and the 2nd OLED (OLED2) conducting, an OLED (OLED1) ends.
Preferably, under the first state, under the difference of the first level and second electrical level and the second state, second electrical level is equal with the difference of the first level.
Ginseng Figure 3 shows that the sequential chart of AMOLED driving circuit in present embodiment, CLK is clock signal, first level V1 is periodically variable high level 2 δ V and low level 0, first level V1 is low level 0 in odd-numbered frame, be high level 2 δ in even frame, V second electrical level V0 is the constant level δ V in the first level V1 between high level and low level.
Thus, in odd-numbered frame, the difference of second electrical level V0 and the first level V1 is δ V, now OLED1 cut-off, OLED2 conducting, TFT1 cut-off simultaneously, and luminous schematic diagram is joined shown in Fig. 4; In even frame, the difference of the first level V1 and second electrical level is δ V, now OLED1 conducting, and OLED2 ends, and TFT1 cut-off simultaneously, luminous schematic diagram is joined shown in Fig. 5.
Certainly, first level V1 and second electrical level V0 also can be other situations in other embodiments, if the first level V1 is constant level δ V, second electrical level V0 is low level 0 in odd-numbered frame, be high level 2 δ V in even frame, its odd-numbered frame is still identical with above-mentioned embodiment with the luminescence of even frame.
In addition, the first level V1 can be low level 0 in odd-numbered frame, be high level δ V, and second electrical level V0 is high level δ V in odd-numbered frame, is low level 0 in odd-numbered frame in even frame, can realize the alternately luminous of OLED1 and OLED2 equally.
Should be understood that, the electric capacity C in above-mentioned embodiment has one end ground connection, also can be connected with constant level in other embodiments, in this no longer illustrated in greater detail.
Another embodiment of the present invention also discloses a kind of display panel, and this display panel comprises pixel layer, and pixel layer comprises scan signal line and the signal line of the setting of some arrays, pixel layer is provided with the AMOLED driving circuit in above-mentioned embodiment.
An embodiment more of the present invention also discloses a kind of display, and this display comprises above-mentioned display panel.
As can be seen from above embodiment, the present invention arranges two opposite polarity OLED in AMOLED driving circuit, two OLED replace under luminescence makes to drive thin film transistor (TFT) to be operated in AC mode, and then overcome the driving transistors Vth that direct current (DC) bias causes and drift about, exchange the serviceable life driving and also can extend OLED simultaneously.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.

Claims (10)

1. an AMOLED driving circuit, comprising:
Electric capacity;
The first film transistor, comprises the first grid be connected with scan signal line, the first source electrode be connected with signal line and first draining of being connected with electric capacity;
Second thin film transistor (TFT), comprises to drain with first second grid be connected, the second source electrode be connected with the first level and second draining of being connected with second electrical level;
It is characterized in that, described AMOLED driving circuit also to comprise between the first level and the source electrode of the second thin film transistor (TFT) and the OLED be arranged in parallel and the 2nd OLED, the polarity of a described OLED and the 2nd OLED is contrary, magnitude relationship alternately change in adjacent two frame times of described first level and second electrical level, an OLED and the 2nd OLED alternate conduction in adjacent two frame times.
2. AMOLED driving circuit according to claim 1, is characterized in that, described AMOLED driving circuit comprises:
First state, the first level higher than second electrical level, an OLED conducting, the 2nd OLED cut-off;
Second state, the first level is lower than second electrical level, and the 2nd OLED conducting, an OLED ends.
3. AMOLED driving circuit according to claim 2, is characterized in that, under described first state, under the difference of the first level and second electrical level and described second state, second electrical level is equal with the difference of the first level.
4. AMOLED driving circuit according to claim 2, is characterized in that, described first level is periodically variable high level and low level, and second electrical level is the constant level in the first level between high level and low level.
5. AMOLED driving circuit according to claim 2, is characterized in that, described second electrical level is periodically variable high level and low level, and the first level is the constant level in second electrical level between high level and low level.
6. AMOLED driving circuit according to claim 2, is characterized in that, described first level is periodically variable high level and low level, and second electrical level is periodically variable low level and high level.
7. AMOLED driving circuit according to claim 2, is characterized in that, the first state of described AMOLED driving circuit and the second state are respectively the state of odd-numbered frame and even frame, and an OLED and the 2nd OLED is the frame period.
8. AMOLED driving circuit according to claim 1, is characterized in that, one end of described electric capacity and first of the first film transistor drains and is connected, the other end ground connection of electric capacity.
9. a display panel, described display panel comprises pixel layer, and pixel layer comprises scan signal line and the signal line of the setting of some arrays, it is characterized in that, described pixel layer is provided with the AMOLED driving circuit described in claim 1 ~ 8.
10. a display, is characterized in that, described display comprises display panel according to claim 9.
CN201510708122.0A 2015-10-27 2015-10-27 AMOLED driving circuits, display panel and display Active CN105185321B (en)

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CN110459164A (en) * 2019-07-26 2019-11-15 深圳市华星光电半导体显示技术有限公司 Pixel-driving circuit and display device
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CN111968565A (en) * 2020-08-11 2020-11-20 Tcl华星光电技术有限公司 Self-luminous pixel circuit and display panel
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CN114038414A (en) * 2021-12-09 2022-02-11 深圳市华星光电半导体显示技术有限公司 Light emitting device driving circuit, backlight module and display panel

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WO2019037232A1 (en) * 2017-08-24 2019-02-28 深圳市华星光电半导体显示技术有限公司 Oled pixel circuit and method for retarding ageing of oled device
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CN113808547A (en) * 2021-09-26 2021-12-17 Tcl华星光电技术有限公司 Light emitting device driving circuit, backlight module and display panel
CN114038414A (en) * 2021-12-09 2022-02-11 深圳市华星光电半导体显示技术有限公司 Light emitting device driving circuit, backlight module and display panel

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