CN209045139U - A kind of pixel-driving circuit and liquid crystal display device - Google Patents
A kind of pixel-driving circuit and liquid crystal display device Download PDFInfo
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- CN209045139U CN209045139U CN201821570417.1U CN201821570417U CN209045139U CN 209045139 U CN209045139 U CN 209045139U CN 201821570417 U CN201821570417 U CN 201821570417U CN 209045139 U CN209045139 U CN 209045139U
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Abstract
The utility model provides a kind of pixel-driving circuit and liquid crystal display device, and wherein pixel-driving circuit includes the first transistor T1, second transistor T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the 7th transistor T7, the 8th transistor T8, first capacitor C1 and the second capacitor C2；The grid of the first transistor T1 is connect with scan signal line Gn-4, the drain electrode of the first transistor T1 is connect with FW, the source electrode of the first transistor T1 is connect with the source electrode of the drain electrode of the 7th transistor T7, the grid of second transistor T2 and the 8th transistor T8, and the grid of the 7th transistor T7 is connect with scan signal line Gn+4.The utility model avoids the influence of damage and big leakage current to Display panel when Q point is in two multiplication of voltages in circuit to T1, improves display effect.
Description
Technical field
The utility model relates to field more particularly to a kind of pixel-driving circuits and liquid crystal display device.
Background technique
TFT (ThinFilmTransistor) is the abbreviation of thin film transistor (TFT).TFT formula display screen is all kinds of laptops
With the mainstream display device on desktop computer, each liquid crystal pixel point on such display screen is subsequent by being integrated in pixel
Thin film transistor (TFT) drives, therefore TFT formula display screen is also a kind of active matrix liquid crystal display device.
Each pixel tool in active-matrix liquid crystal display (ActiveMatrixLiquidCrystalDisplay)
There is a TFT, grid (Gate) is connected to horizontal direction scan line, and source electrode (Drain) is connected to the data of vertical direction
Line, and source electrode (Source) is then connected to pixel electrode.If applying enough positive electricity in a certain scan line in the horizontal direction
Pressure can make TFT all on this bar line open, and the pixel electrode on this bar line can connect with the data line of vertical direction at this time
It connects, and by the light transmittance in the video signal voltage writing pixel on data line, controlling different liquid crystal and then reaches control color
Effect.The driving circuit is mainly completed by binding IC outside panel at present, uses CMOS processing procedure.
And GIP technology, that is, GateInPanel, it is one of TFT-LCD design, basic conception is by (the face LCDPanel
Plate) gate drivers it is integrated on the glass substrate, to replace a kind of technology by external silicon wafer, form the scanning to panel
Driving.The technology not only saves cost compared to COF the and COG technique before improving, while can also save the binding of grid direction
Technique, to being promoted, production capacity is extremely advantageous, and improves the integrated level of TFT-LCD panel.So GIP technology reduces gate driving
The usage amount of IC reduces power consumption and cost, while can make the frame for reducing display panel, realizes the design of narrow frame, is
A kind of significant technology.
COF and COG technique before being relatively improved, there is also certain deficiencies for GIP technology, especially deposit in GIP circuit
A large amount of TFT, increase leakage current etc. to influence caused by display effect etc..How a kind of more preferably effective GIP is designed
Circuit is the acid test that related technical personnel are faced in the industry effectively to improve and eliminate these problems.
Utility model content
For this reason, it may be necessary to provide a kind of pixel-driving circuit and liquid crystal display device, it is bad to solve GIP circuit display effect
Problem.
To achieve the above object, a kind of pixel-driving circuit, including the first transistor T1, the second crystal are inventor provided
Pipe T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the 7th transistor T7, the 8th crystalline substance
Body pipe T8, first capacitor C1 and the second capacitor C2；
The grid and scan signal line G of the first transistor T1n-4Connection, the drain electrode of the first transistor T1 and just sweeps voltage FW
Connection, the drain electrode of the source electrode of the first transistor T1 and the 7th transistor T7, the grid of second transistor T2 and the 8th transistor T8
Source electrode connection, the grid of the 7th transistor T7 and scan signal line Gn+4Connection, the source electrode of the 7th transistor T7 sweep electricity with counter
Press BW connection, the grid and high potential V of the 8th transistor T8HConnection, the drain electrode of the 8th transistor T8 is with the 4th transistor T4's
The source electrode connection of grid, one end of the second capacitor C2, third transistor T3, the source electrode and clock cable of the 4th transistor T4
CK1 connection, the drain electrode of the 4th transistor T4 and the other end, the scan signal line G of the second capacitor C2n, the 5th transistor T5 source
Pole is connected with the source electrode of the 6th transistor T6, the drain electrode of the 5th transistor T5 and drain electrode, the third transistor of the 6th transistor T6
The drain electrode of T3, the drain and gate line VGL connection of second transistor T2, the grid of the 6th transistor T6 and first capacitor C1's
The source electrode connection of one end, the grid of third transistor T3, second transistor T2, the other end and clock cable of first capacitor C1
CK1 connection.
And the utility model also provides a kind of liquid crystal display device, including display pixel and driving circuit, the driving
Circuit is pixel-driving circuit shown in claim 1, the grid of the scan signal line connection and a transistor of pixel-driving circuit
The source electrode of pole, the transistor connects to power supply, and the drain electrode of the transistor and the storage capacitors of display pixel connect.
It is different from the prior art, in the circuit of 7T2C (7 transistors, 2 capacitors) of the above-mentioned technical proposal before improvement
A T8 is introduced, the structure of 8T2C (8 transistors, 2 capacitors) is formed, avoids Q point and be in Coupling (coupling) effect
When directly impact T1, reduce the injury to T1, while also reducing the leakage current of T1, and then ensured the normal of Q point current potential,
The leakage current for effectively reducing GIP circuit stabilizes the output voltage of GIP, improves and stabilize the display matter of TFT panel
Amount.Using the GIP circuit structure of the utility model 8T2C, influence of the Q point to T1 can be effectively reduced, is reduced simultaneously
The leakage current of GIP exports stable Gn voltage to reach, and ensures that TFT panel shows the effect of quality.Before avoiding improvement
The influence of damage and big leakage current to Display panel when Q point is in two multiplication of voltages in 7T2C circuit to T1.
Detailed description of the invention
Fig. 1 is the 7T2CGIP circuit diagram before improving；
Fig. 2 is the 7T2CGIP circuit timing diagram before improving；
Fig. 3 is Vgs-Id schematic diagram；
Fig. 4 is the 8T2CGIP circuit diagram of the utility model；
Fig. 5 is the 8T2CGIP circuit timing diagram of the utility model；
Fig. 6 is the charging stage schematic diagram of the utility model；
Fig. 7 is the output stage schematic diagram of the utility model；
Fig. 8 is the drop-down stage schematic diagram of the utility model；
Fig. 9 is the drop-down maintenance stage schematic diagram of the utility model；
Figure 10 is the pixel circuit of the utility model.
Specific embodiment
Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality
It applies example and attached drawing is cooperated to be explained in detail.
Fig. 1 to Figure 10 is please referred to, the present embodiment provides a kind of pixel-driving circuits, as shown in figure 4, including the first transistor
T1, second transistor T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the 7th crystal
Pipe T7, the 8th transistor T8, first capacitor C1 and the second capacitor C2；The grid and scan signal line G of the first transistor T1n-4Even
It connecing, the drain electrode of the first transistor T1 is connect with voltage FW is just swept, the drain electrode of the source electrode and the 7th transistor T7 of the first transistor T1,
The connection of the source electrode of the grid of second transistor T2 and the 8th transistor T8, the grid and scan signal line G of the 7th transistor T7n+4
Connection, the source electrode of the 7th transistor T7 are connect with the anti-voltage BW that sweeps, the grid and high potential V of the 8th transistor T8HConnection, the
The drain electrode of eight transistor T8 is connect with the source electrode of the grid of the 4th transistor T4, one end of the second capacitor C2, third transistor T3,
The source electrode of 4th transistor T4 is connect with clock cable CK1, the drain electrode of the 4th transistor T4 and the other end of the second capacitor C2,
Scan signal line Gn, the 5th transistor T5 source electrode and the 6th transistor T6 source electrode connection, the drain electrode of the 5th transistor T5 with
The drain electrode of 6th transistor T6, the drain electrode of third transistor T3, the drain and gate line VGL connection of second transistor T2, the 6th
The grid of transistor T6 is connect with the source electrode of one end of first capacitor C1, the grid of third transistor T3, second transistor T2, the
The other end of one capacitor C1 is connect with clock cable CK1.
The working principle of the utility model is described in detail below.Fig. 1 is the 7T2C circuit diagram before improving, figure
2 be the 7T2C circuit timing diagram before improving: in GIP circuit, when TFT normal switching-off, Vgs (gate source voltage) is in -25V
Between~-20V, but in 7T2C structure, as output stage (t2) in following Fig. 1, when will cause T1 closing,
Vgs is -40V.This is because in output stage, Q point because C2 capacitor Coupling effect so that Q point at the moment at
In the state (about 30V) of two multiplication of voltages, and Gn-4 is low potential (- 10V) at the moment, thus at this time the Vgs voltage of T1 about-
40V.According to the curve (shown in Fig. 3) of the Vgs-Id of TFT, when Vgs is less than -20V, leakage current Id can slowly increase instead.
So in the GIP circuit of 7T2C, when being in output stage, the leakage current of T1 is possible to can be excessive, this will may
The reduction for causing Q point current potential in the GIP circuit affects T4 in GIP and exports stable voltage Gn, and then affects the aobvious of TFT
Show quality.
Fig. 4 be the utility model 8T2C circuit diagram and Fig. 5 be the utility model 8T2C circuit timing diagram: in Q
A T8 structure is introduced between point and M point, when being in output stage (t2), Q point is also due to the Coupling of C2 capacitor is imitated
It answers, so that Q point state in two multiplication of voltages at the moment, but due to introducing a normally opened T8 structure, so that the base of M point
This voltage is constant, the injury this avoid double pressure to T1, while also reducing its leakage current.So during this period, the electricity of Q point
Pressure is basically unchanged, while also stabilizing the output voltage Gn of T4.
During Fig. 6 preliminary filling: CK5 and Gn-4 signal is high potential, at this point, T1, T2, T5 and T8 are opened, M point and Q at this time
The current potential of point is VH high potential, and the current potential of Gn and P are the precharge for completing Q point in this stage of VL low potential.
During Fig. 7 is exported, CK1 signal is high potential, T2 and T4 opening states at this time, during this period, due to C2's
Coupling effect so that it is about 2VH that the current potential of Q point, which increases, at this time due between Q point and M point there are a normally opened T8, from
And the leakage current of T1 is reduced, so that the current potential of Q point is stabilized, to stabilize the output voltage VH of Gn.
During Fig. 8 is pulled down: CK5 and Gn+4 signal is high potential, and T5 and T7 are in the open state at this time, during this period, Q point
It is influenced with Gn current potential by VGL, it is dragged down into value VL by original high potential.
Fig. 9 pulls down maintenance period: CK1 is high potential, at this time P point due to capacitor CI Coupling effect so that P point electricity
Position is high potential, so that T3 and T6 opening state, so that Q point and Gn maintain VL state.Q point is avoided to be in
T1 is directly impacted when Coupling (coupling) effect, reduces the injury to T1, while also reducing the leakage current of T1, Jin Erbao
The normal of Q point current potential is hindered, has effectively reduced the leakage current of GIP circuit, stabilized the output voltage of GIP, improved and has stablized
The display quality of TFT panel.Using the GIP circuit structure of the utility model 8T2C, Q point can be effectively reduced to T1's
It influences, while reducing the leakage current of GIP, export stable Gn voltage to reach, ensure that TFT panel shows the effect of quality
Fruit.Damage when Q point is in two multiplication of voltages in 7T2C circuit before improving to T1 and big leakage current are avoided to the shadow of Display panel
It rings, display effect can be improved.
And the utility model also provides a kind of liquid crystal display device, including display pixel and driving circuit, the driving
Circuit is pixel-driving circuit shown in claim 1, the grid of the scan signal line connection and a transistor of pixel-driving circuit
The source electrode of pole, the transistor connects to power supply, and the drain electrode of the transistor and the storage capacitors of display pixel connect.Such as Figure 10 institute
Show, there are two storage capacitors Clc and capacitor Cst for general display pixel tool.Using the liquid crystal of the driving circuit of the utility model
Display effect can be improved in showing device.
It should be noted that being not intended to limit although the various embodiments described above have been described herein
The scope of patent protection of the utility model.Therefore, based on the innovative idea of the utility model, embodiment described herein is carried out
Change and modification or equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly
Or above technical scheme is used in other related technical areas indirectly, it is included in the protection model of the utility model patent
Within enclosing.
Claims (2)
1. a kind of pixel-driving circuit, it is characterised in that: including the first transistor T1, second transistor T2, third transistor T3,
4th transistor T4, the 5th transistor T5, the 6th transistor T6, the 7th transistor T7, the 8th transistor T8, first capacitor C1 and
Second capacitor C2；
The grid and scan signal line G of the first transistor T1n-4Connection, the drain electrode of the first transistor T1 are connect with voltage FW is just swept,
The drain electrode of the source electrode of the first transistor T1 and the 7th transistor T7, the grid of second transistor T2 and the 8th transistor T8 source electrode
Connection, the grid and scan signal line G of the 7th transistor T7n+4Connection, the source electrode of the 7th transistor T7 and the anti-voltage BW that sweeps connect
It connects, the grid and high potential V of the 8th transistor T8HConnection, the drain electrode of the 8th transistor T8 and the grid of the 4th transistor T4, the
The source electrode connection of one end, third transistor T3 of two capacitor C2, the source electrode of the 4th transistor T4 are connect with clock cable CK1,
The drain electrode of 4th transistor T4 and the other end, the scan signal line G of the second capacitor C2n, the 5th transistor T5 source electrode and the 6th
The source electrode of transistor T6 connects, the drain electrode of the drain electrode of the 5th transistor T5 and the 6th transistor T6, the drain electrode of third transistor T3,
The drain and gate line VGL connection of second transistor T2, the grid of the 6th transistor T6 and one end of first capacitor C1, third are brilliant
The source electrode connection of the grid, second transistor T2 of body pipe T3, the other end of first capacitor C1 are connect with clock cable CK1.
2. a kind of liquid crystal display device, it is characterised in that: including display pixel and driving circuit, the driving circuit is wanted for right
Pixel-driving circuit shown in asking 1, the grid of the scan signal line connection and a transistor of pixel-driving circuit, the transistor
Source electrode connects to power supply, and the drain electrode of the transistor and the storage capacitors of display pixel connect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821570417.1U CN209045139U (en) | 2018-09-26 | 2018-09-26 | A kind of pixel-driving circuit and liquid crystal display device |
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| CN201821570417.1U CN209045139U (en) | 2018-09-26 | 2018-09-26 | A kind of pixel-driving circuit and liquid crystal display device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112037721A (en) * | 2020-08-06 | 2020-12-04 | 武汉华星光电技术有限公司 | GOA circuit, display panel and display device thereof |
| CN112466257A (en) * | 2020-11-26 | 2021-03-09 | 福建华佳彩有限公司 | GIP circuit and driving method |
| CN112509533A (en) * | 2020-12-14 | 2021-03-16 | 福建华佳彩有限公司 | Novel GIP circuit and driving method thereof |
| CN112530348A (en) * | 2020-12-14 | 2021-03-19 | 福建华佳彩有限公司 | Grid circuit for improving display quality and driving method |
| CN112735321A (en) * | 2021-01-12 | 2021-04-30 | 福建华佳彩有限公司 | Circuit for improving driving current of display screen and driving method |
| CN112885283A (en) * | 2021-02-25 | 2021-06-01 | 福建华佳彩有限公司 | GIP driving circuit and control method thereof |
| CN112885284A (en) * | 2021-02-25 | 2021-06-01 | 福建华佳彩有限公司 | GIP circuit of touch display screen and control method thereof |
| CN112885286A (en) * | 2021-02-25 | 2021-06-01 | 福建华佳彩有限公司 | GIP circuit for reducing display defects and control method thereof |
| CN114596828A (en) * | 2022-04-25 | 2022-06-07 | 福建华佳彩有限公司 | 12T1C GIP circuit for reducing load and driving method thereof |
| CN114613311A (en) * | 2022-03-29 | 2022-06-10 | 福建华佳彩有限公司 | 9T2C circuit for improving stability of display screen and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112037721A (en) * | 2020-08-06 | 2020-12-04 | 武汉华星光电技术有限公司 | GOA circuit, display panel and display device thereof |
| CN112466257A (en) * | 2020-11-26 | 2021-03-09 | 福建华佳彩有限公司 | GIP circuit and driving method |
| CN112530348B (en) * | 2020-12-14 | 2024-01-16 | 福建华佳彩有限公司 | Gate circuit for improving display quality and driving method |
| CN112509533A (en) * | 2020-12-14 | 2021-03-16 | 福建华佳彩有限公司 | Novel GIP circuit and driving method thereof |
| CN112530348A (en) * | 2020-12-14 | 2021-03-19 | 福建华佳彩有限公司 | Grid circuit for improving display quality and driving method |
| CN112735321A (en) * | 2021-01-12 | 2021-04-30 | 福建华佳彩有限公司 | Circuit for improving driving current of display screen and driving method |
| CN112735321B (en) * | 2021-01-12 | 2024-04-05 | 福建华佳彩有限公司 | Circuit for improving driving current of display screen and driving method |
| CN112885284A (en) * | 2021-02-25 | 2021-06-01 | 福建华佳彩有限公司 | GIP circuit of touch display screen and control method thereof |
| CN112885286A (en) * | 2021-02-25 | 2021-06-01 | 福建华佳彩有限公司 | GIP circuit for reducing display defects and control method thereof |
| CN112885284B (en) * | 2021-02-25 | 2024-01-19 | 福建华佳彩有限公司 | GIP circuit of touch display screen and control method thereof |
| CN112885283B (en) * | 2021-02-25 | 2024-01-19 | 福建华佳彩有限公司 | GIP driving circuit and control method thereof |
| CN112885286B (en) * | 2021-02-25 | 2024-01-19 | 福建华佳彩有限公司 | GIP circuit for reducing display defects and control method thereof |
| CN112885283A (en) * | 2021-02-25 | 2021-06-01 | 福建华佳彩有限公司 | GIP driving circuit and control method thereof |
| CN114613311A (en) * | 2022-03-29 | 2022-06-10 | 福建华佳彩有限公司 | 9T2C circuit for improving stability of display screen and driving method thereof |
| CN114596828A (en) * | 2022-04-25 | 2022-06-07 | 福建华佳彩有限公司 | 12T1C GIP circuit for reducing load and driving method thereof |
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