CN107068073B - Liquid crystal display panel and its driving method - Google Patents
Liquid crystal display panel and its driving method Download PDFInfo
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- CN107068073B CN107068073B CN201611217396.0A CN201611217396A CN107068073B CN 107068073 B CN107068073 B CN 107068073B CN 201611217396 A CN201611217396 A CN 201611217396A CN 107068073 B CN107068073 B CN 107068073B
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- circuit
- liquid crystal
- crystal display
- display panel
- detection signal
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
Abstract
The present invention provides a kind of liquid crystal display panel and its driving method, it includes source driving chip, the source driving chip include: multiple channels, with multiple channel attached first circuit and the second circuit and tertiary circuit that are connect with first circuit in parallel, the second circuit is equipped with the first TFT switch, and the second circuit is equipped with the second TFT switch.The present invention increases the circuit of control control signal XON in source driving chip, by detection signal TP and control signal XON cooperation, is acted according to TFT switch timing, exports VCOM voltage and data line signal；The present invention requires its GIP circuit to have XON circuit function for GIP liquid crystal display panel, and level translator receives control signal XON and does solution tide；The present invention sets independent circuit for detecting, wherein a fixed value will be set as by comparing voltage.
Description
Technical field
The invention belongs to technical field of liquid crystal display more particularly to a kind of liquid crystal display panels and its driving method.
Background technique
IGZO (Indium Gallium Zinc Oxide) is the abbreviation of indium gallium zinc, it is a kind of membrane transistor
Technology sputters one layer of metal oxide on the gate insulating layer of TFT-LCD.IGZO compared with uncrystalline silicon (a-Si) material,
20 to 50 times fast compared with a-Si TFT of electron mobility, IGZO uses indium, gallium, zinc, oxygen, instead of traditional current figure of a-Si
Layer can substantially reduce the response time of LCD screen, reduce transistor size, improve the aperture opening ratio of liquid crystal display panel picture element, compared with
It easily realizes High precision, thus simple external circuit is integrated among panel, keeps mobile device more frivolous, power consumption also drops
To 2/3rds before.It is compared using the TFT I-V characteristic of a-SI, LTPS (low-temperature polysilicon silicon technology), IGZO such as Fig. 1 institute
Show.
For IGZO TFT compared with a-Si TFT, conducting electric current is about 20 times high:, can since TFT can be decreased to about 1/4
By improving, panel aperture ratio reduces power consumption and realizes pixel High precision.
IGZO TFT is respectively compared with a-Si TFT and LTPS TFT, and cut-off leakage current is only less than 1pA: even if reducing
The driving number of TFT can also maintain the orientation of liquid crystal molecule, therefore the power consumption of panel monomer can be reduced to 1/5 to 1/10.
The V-I characteristic of IGZO-TFT shown in FIG. 1 is observed, not only conduction property is excellent for discovery, while cut-off characteristics is also special
It is excellent.The cut-off characteristics of the TFT formed in available liquid crystal panel using amorphous silicon is bad, therefore the charge energy after power-off in pixel
The problem of being discharged quickly through TFT, therefore not will form special pixel charge residual.But due to the cut-off of the TFT of IGZO spy
Property spy it is excellent, will lead in this way when using IGZO technology panel power-off after pixel charge will not quickly be discharged via TFT,
As a result it is exactly that charge remains in panel itself for a long time, shutdown is caused the phenomenon that ghost and booting splashette next time occur.If
Panel picture element charge can not discharge, and panel just will appear ghost problem, and phenomenon is as shown in Figure 2.
Summary of the invention
The purpose of the present invention is to provide liquid crystal display panel and its drivings of accelerating charge rate of release when a kind of shutdown
Method.
The present invention provides a kind of liquid crystal display panel comprising source driving chip, the source driving chip include: more
A channel, with multiple channel attached first circuit and the second circuit and third that are connect with first circuit in parallel electricity
Road, the second circuit are equipped with the first TFT switch, and the second circuit is equipped with the second TFT switch.
It preferably, further include circuit for detecting of the output control signal XON to the source driving chip, the control signal
XON is input to first TFT switch.
It preferably, further include the timing control core of output voltage VCOM and detection signal TP to the source driving chip
Piece, the detection signal TP are input to second TFT switch, and the output voltage VCOM is input to the second circuit.
It preferably, further include the level translator for receiving control the signal XON and detection signal TP.
It preferably, further include positioned at the left GIP circuit on the liquid crystal display panel left side and on the right of liquid crystal display panel
Right GIP circuit.
It preferably, further include metal oxide semiconductor layer, for the metal oxide of indium gallium zinc composition.
The present invention also provides the driving methods of liquid crystal display panel, include the following steps:
Step 1: sequence controller chip operation, circuit for detecting exports high level control letter when liquid crystal display panel is switched on
Number XON is opened to the first TFT switch, the first TFT switch；
Step 2: control signal XON is high level, detection signal TP is low level, and the second TFT switch is closed；Timing control
Device chip processed exports VCOM voltage to source driving chip, and multiple channels of source driving chip export VCOM voltage；
Step 3: when first detection signal TP and second detection signal TP detecting become high level, source drive
Chip output data line signal, picture are normally shown；
Step 4: when detection signal TP and the 4th detection signal TP detecting of third becomes high level, source drive
Chip output data line signal, picture are normally shown；
Step 5: and so on: when (n-1) a detection signal TP and n-th of detection signal TP becomes high level, source
Pole driving chip output data line signal, picture are normally shown；
Step 6: input voltage reduces when liquid crystal display panel shuts down, sequence controller chip stops working, detecting electricity
Road output control signal XON becomes low level by high level；Level translator receives low level control signal XON, by grid
The TFT switch of pole connection is fully open, discharges the charge of pixel.
The present invention increases the circuit of control control control signal XON in source driving chip, passes through detection signal TP and control
Signal XON cooperation processed, acts according to TFT switch timing, exports VCOM voltage and data line signal；The present invention is directed to GIP liquid crystal
Display panel requires its GIP circuit to have XON circuit function, and level translator receives control signal XON and does solution tide；The present invention
Independent circuit for detecting is set, wherein a fixed value will be set as by comparing voltage.
Detailed description of the invention
Fig. 1 is the TFT I-V characteristic comparison chart of existing a-SI, LTPS, IGZO；
Fig. 2 is the schematic diagram of existing shutdown image retention；
Fig. 3 is the structural schematic diagram of liquid crystal display panel of the present invention；
Fig. 4 is the circuit diagram of the source driving chip of liquid crystal display panel shown in Fig. 3；
Fig. 5 is the working timing figure of liquid crystal display panel shown in Fig. 3.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
This liquid crystal display panel uses GIP technology, and GIP (Gate In Panel, face inner grid) technology is by liquid crystal display panel
Gate driving circuit Source Driver is integrated in array substrate, generates high pressure GIP signal (High Voltage GIP
Signal, HV GIP Signal), and high pressure GIP signal is sent to GIP circuit GIP Circuit, then have GIP circuit raw
At gate drive signal, thus to liquid crystal display panel turntable driving, therefore compare the driving skill of traditional liquid crystal display panel
Art, not only section eliminates the welding region (bonding) of gate driving circuit and is fanned out to (fan-out) wiring space, but also
Realize the design of narrow frame.
As shown in figure 3, using the liquid crystal display panel of GIP technology include: circuit for detecting (Voltage Detector) 10,
Level translator (Level shift) 20, source driving chip (Source driver IC) 30, sequence controller chip (T-
CON) 40, left GIP circuit 50 and right GIP circuit 60.Sequence controller chip (T-CON) 40 exports VCOM voltage and detecting
Signal TP is to source driving chip (Source driver IC) 30；The output control of circuit for detecting (Voltage Detector) 10
Signal XON is to source driving chip (Source driver IC) 30；In the moment of booting, as circuit for detecting (Voltage
Detector) when 10 output control signal XON, sequence controller chip (T-CON) 40 is exported without detection signal TP, i.e. detecting letter
Number TP is low level.
Wherein, the detecting voltage that circuit for detecting (Voltage Detector) 10 is set must be fixed as a value；Source electrode
Driving chip (Source driver IC) 30 has the function of XON circuit；Level translator (Level shift) 20 can receive
Signal XON and control signal IP are controlled, left GIP circuit 50 and right GIP circuit 60 is cooperated to solve tide function when completing shutdown.
When booting, source driving chip (Source driver IC) 30 sequence controller chip (T-CON) 40 when
Sequence acts lower output voltage VCOM, when slowing down liquid crystal display panel booting phenomena such as splashette.When signal XON becomes low by high level
When level, level translator (Level shift) 20 all exports high level VGH.
As shown in figure 4, source driving chip (Source driver IC) 30 include: multiple channels 31, with it is multiple logical
First circuit 32 of the connection of road 31, the first TFT switch 321 being arranged on first circuit 32 connect side by side with the first circuit 32
The second circuit 33 and tertiary circuit 34 that connect, the second TFT switch 331 being arranged on the second circuit 32, wherein second circuit
32 and tertiary circuit 33 be connected to outside source driving chip (Source driver IC) 30；Pass through the first TFT switch 321
With 331 relevant connection of the second TFT switch.
Ground voltage GND is input to second circuit 33, and input voltage VCOM is input to tertiary circuit 34, controls signal XON
It is input to the first TFT switch 321, detection signal TP is input to the second TFT switch 331, and detection signal TP is sequence controller core
The signal voltage that piece (T-CON) 40 provides.
When liquid crystal display panel is switched on, it may be assumed that input 5V voltage, circuit for detecting to liquid crystal display panel
(VoltageDetector) 10 detect detection signal TP without output, control signal control signal XON be high level when, first
TFT switch 321 is opened, and the second TFT switch 331 is closed, and 40 output voltage VCOM of sequence controller chip (T-CON) is through the first electricity
Road 32 to multiple channels 31, all multiple 31 output voltages of channel of source driving chip (Source driver IC) 30
VCOM；When the 1ststWith the 2nd 2ndDetection signal TP, the 3rd 1stWith the 4th 2ndDetection signal TP, the 3rd 1stWith the 4th 2ndDetecting
Signal TP ... it detects when becoming high level, source driving chip (Source driver IC) 30 output voltage VCOM give
Data line；When liquid crystal display panel shuts down, detection signal TP is to become low level by high level without output, control signal XON, electricity
All output high level VGH opens the first TFT switch 321 and the second TFT switch 331 to flat turn parallel operation (Level shift) 20, with
Discharge charge.
It is illustrated in figure 5 the timing diagram of liquid crystal display panel work of the present invention, the driving side of liquid crystal display panel of the present invention
Method includes the following steps:
Step 1: when liquid crystal display panel is switched on, it may be assumed that input 5V voltage, sequence controller chip to liquid crystal display panel
(T-CON) 40 work, circuit for detecting (Voltage Detector) 10 export high-level control signal XON to the first TFT switch
321, the first TFT switch 321 is opened；
Step 2: control signal XON is high level, detection signal TP is low level, and the second TFT switch 331 is closed；Timing
Controller chip (T-CON) 40 exports VCOM voltage to source driving chip (Sourcedriver IC) 30, source driving chip
Multiple channels of (Source driver IC) 30 export VCOM voltage；
Step 3: first 1stDetection signal TP and second 2ndWhen detection signal TP detecting becomes high level, source electrode
Driving chip (Source driver IC) 30 output data line signals, picture are normally shown；
Step 4: third 3stDetection signal TP and the 4th 3ndWhen detection signal TP detecting becomes high level, source electrode
Driving chip (Source driver IC) 30 output data line signals, picture are normally shown；
Step 5: and so on: (n-1)th (N-1)stDetection signal TP and n-th of NndDetection signal TP detecting becomes
When high level, source driving chip (Source driver IC) 30 output data line signals, picture is normally shown；
Step 6: input voltage reduces when liquid crystal display panel shuts down, sequence controller chip (T-CON) 40 stops work
Make, the output control of circuit for detecting 10 signal XON becomes low level by high level；Level translator (Level shift) 20 receives
To low level control signal XON, the TFT switch that grid is connected is fully open, discharges the charge of pixel.
Metal oxide semiconductor layer is equipped in liquid crystal display panel of the present invention, for the metal oxidation of indium gallium zinc composition
Object.
The present invention increases the circuit of control control control signal XON in source driving chip, passes through detection signal TP and control
Signal XON cooperation processed, acts according to TFT switch timing, exports VCOM voltage and data line signal；The present invention is directed to GIP liquid crystal
Display panel requires its GIP circuit to have XON circuit function, and level translator receives control signal XON and does solution tide；The present invention
Independent circuit for detecting is set, wherein a fixed value will be set as by comparing voltage.
Claims (4)
1. a kind of liquid crystal display panel comprising source driving chip, which is characterized in that the source driving chip includes: more
A channel, with multiple channel attached first circuit, the second circuit being connect with first circuit in parallel and tertiary circuit, defeated
The circuit for detecting and level translator of the timing controller of voltage VCOM and detection signal TP, output control signal XON out；
First circuit is equipped with the first TFT switch, and the second circuit is equipped with the second TFT switch；The control signal
XON is input to the first TFT switch, and the detection signal TP is input to the second TFT switch, and the output voltage VCOM is input to
Two circuits, the level translator receive the control signal XON and detection signal TP.
2. liquid crystal display panel according to claim 1, it is characterised in that: further include being located at the liquid crystal display panel left side
Left GIP circuit and the right GIP circuit on the right of liquid crystal display panel.
3. liquid crystal display panel according to claim 1, it is characterised in that: it further include metal oxide semiconductor layer,
For the metal oxide of indium gallium zinc composition.
4. the driving method of -3 any liquid crystal display panels according to claim 1, which comprises the steps of:
Step 1: sequence controller chip operation, circuit for detecting exports high-level control signal when liquid crystal display panel is switched on
XON to the first TFT switch, open by the first TFT switch；
Step 2: control signal XON is high level, detection signal TP is low level, and the second TFT switch is closed；Sequence controller
Chip exports VCOM voltage to source driving chip, and multiple channels of source driving chip export VCOM voltage；
Step 3: when first detection signal TP and second detection signal TP detecting become high level, source driving chip
Output data line signal, picture are normally shown；
Step 4: when detection signal TP and the 4th detection signal TP detecting of third becomes high level, source driving chip
Output data line signal, picture are normally shown；
Step 5: and so on: when (n-1) a detection signal TP and n-th of detection signal TP becomes high level, source electrode is driven
Dynamic chip output data line signal, picture are normally shown；
Step 6: input voltage reduces when liquid crystal display panel shuts down, sequence controller chip stops working, and circuit for detecting is defeated
Control signal XON becomes low level by high level out；Level translator receives low level control signal XON, and grid is connected
The TFT switch connect is fully open, discharges the charge of pixel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611217396.0A CN107068073B (en) | 2016-12-26 | 2016-12-26 | Liquid crystal display panel and its driving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611217396.0A CN107068073B (en) | 2016-12-26 | 2016-12-26 | Liquid crystal display panel and its driving method |
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| CN107068073A CN107068073A (en) | 2017-08-18 |
| CN107068073B true CN107068073B (en) | 2019-05-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107871484B (en) * | 2017-12-08 | 2020-11-06 | 南京中电熊猫平板显示科技有限公司 | Liquid crystal display device and method for improving power-down flash of display panel |
| JP2019138923A (en) * | 2018-02-06 | 2019-08-22 | シャープ株式会社 | Display device |
| CN111369952A (en) * | 2020-03-26 | 2020-07-03 | 福建华佳彩有限公司 | GIP circuit and display panel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211036A (en) * | 2006-12-29 | 2008-07-02 | 群康科技(深圳)有限公司 | LCD device and its display method |
| CN101727853A (en) * | 2008-10-31 | 2010-06-09 | 瀚宇彩晶股份有限公司 | Liquid crystal display and control method thereof |
| CN103400555A (en) * | 2013-07-23 | 2013-11-20 | 合肥京东方光电科技有限公司 | Circuit for eliminating shutdown residual shadows and display |
| CN105632435A (en) * | 2016-01-05 | 2016-06-01 | 京东方科技集团股份有限公司 | Residual image circuit for switching on/off and method for removing residual image of switching on/off |
-
2016
- 2016-12-26 CN CN201611217396.0A patent/CN107068073B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211036A (en) * | 2006-12-29 | 2008-07-02 | 群康科技(深圳)有限公司 | LCD device and its display method |
| CN101727853A (en) * | 2008-10-31 | 2010-06-09 | 瀚宇彩晶股份有限公司 | Liquid crystal display and control method thereof |
| CN103400555A (en) * | 2013-07-23 | 2013-11-20 | 合肥京东方光电科技有限公司 | Circuit for eliminating shutdown residual shadows and display |
| CN105632435A (en) * | 2016-01-05 | 2016-06-01 | 京东方科技集团股份有限公司 | Residual image circuit for switching on/off and method for removing residual image of switching on/off |
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| CN107068073A (en) | 2017-08-18 |
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