CN107909979A - Liquid crystal display device and the method for improving display panel power down splashette - Google Patents
Liquid crystal display device and the method for improving display panel power down splashette Download PDFInfo
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- CN107909979A CN107909979A CN201711295916.4A CN201711295916A CN107909979A CN 107909979 A CN107909979 A CN 107909979A CN 201711295916 A CN201711295916 A CN 201711295916A CN 107909979 A CN107909979 A CN 107909979A
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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
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
The invention discloses a kind of liquid crystal display device, including display panel, Demultiplexing circuitry, data drive circuit and time schedule controller, further include：Multiple charge/discharge control circuits；Charge/discharge control circuit and the first data cable correspond；Charge/discharge control circuit includes first film transistor；The source electrode of first film transistor connects corresponding first data cable；The drain electrode connection ground terminal cabling of first film transistor；The grid connection time schedule controller of first film transistor；Time schedule controller is used to produce first control signal input Demultiplexing circuitry when monitoring display panel power down, and produces second control signal input charge/discharge control circuit；Upon receiving the first control signal, Demultiplexing circuitry connects the first data cable and corresponding second data cable；When receiving second control signal, the first film transistor of charge/discharge control circuit is opened, and corresponding second data cable is connected with ground terminal cabling.
Description
Technical field
The present invention relates to field of liquid crystal display, more particularly to a kind of liquid crystal display device and improvement display panel power down splashette
Method.
Background technology
At present, liquid crystal display device extensively should since it has the advantages that high image quality, power saving, fuselage are thin, light-weight
For electronic products such as digital camera, laptop, desktop computer, television set, mobile phones, become the display device of mainstream.
In existing liquid crystal display panel, the position of Demultiplexing circuitry (abbreviation Demux circuits) is as shown in Fig. 1：AA areas
For viewing area, IC is data drive circuit, and Demux circuits are located at the top below viewing area with IC in figure, connection IC and display
Area.
One data drive circuit IC draws multiple source output pin (data output pins), each source
More data lines in output pin corresponding panels, are effectively reduced the pin numbers being connected on IC, simplify below panel
Cabling.It is a plurality of gating line traffic control it is all point with switch, in a frame show, first, before this one gating line traffic control it is all and
Its permutation connected is divided to be opened with switch, and the data cable to all row charges, and is then closed with switch dividing for the row.Short intervals
Afterwards, another gating line traffic control all connected permutations point are opened with switch, and the data cable to all row charges, and has charged
Cheng Hou, then control closed with switch dividing for the row, complete the display of a frame.Fig. 2 is 1:The circuit diagram of 3demux circuits, number
It is input to according to voltage by demux circuits in display panel, select lines SWR, SWG, SWB are staggeredly opened.
Due to very small using the TFT off-state currents of IGZO techniques, so the LCD display using IGZO TFT techniques
It is particularly important that release in shutdown of electric charge in the pixel electrode of plate.If the electric charge in panel cannot all discharge, can lead
The liquid crystal polarization of panel is caused, the pictures such as splashette exception occurs in whens switching on and shutting down.When display panel powered-off fault, because input electricity
Press power down speed very fast, it is therefore desirable to accelerate data voltage power down speed.If data voltage, which declines, is insufficient to fast, Wu Fa
Common electric voltage VSS reaches GND before opening voltage less than metal-oxide-semiconductor, then charge residue causes splashette of starting shooting.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of liquid crystal display device and improves display panel power down splashette
Method, the power down speed of data voltage when can improve display panel powered-off fault to the full extent.
Technical solution provided by the invention is as follows：
The invention discloses a kind of liquid crystal display device, including display panel, Demultiplexing circuitry, data drive circuit and
Time schedule controller；The data drive circuit passes through the first data cable output data voltage to the Demultiplexing circuitry；It is described
Data voltage is inputted a plurality of second data cable corresponding with the first data cable to display panel, institute by Demultiplexing circuitry respectively
The quantity for stating the second data cable is n times of the quantity of the first data cable, wherein n >=1, and n is positive integer, is further included：Multiple electric discharges
Control circuit；The charge/discharge control circuit is corresponded with first data cable；It is thin that the charge/discharge control circuit includes first
Film transistor；The source electrode of first film transistor connects corresponding first data cable；The drain electrode of first film transistor connects
Ground terminal cabling；The grid connection time schedule controller of first film transistor；Time schedule controller, which is used to work as, monitors that display panel falls
First control signal input Demultiplexing circuitry is produced when electric, and produces second control signal input charge/discharge control circuit；When
When receiving the first control signal, the Demultiplexing circuitry connects the first data cable and corresponding second data cable；When
When receiving the second control signal, the first film transistor of the charge/discharge control circuit is opened, and corresponding second is counted
Connected according to line with ground terminal cabling.
Further, the Demultiplexing circuitry includes multiple circuit subelements corresponding with the first data cable and n bars
Select lines；The circuit subelement includes n points with switch, and each point is corresponded with select lines respectively with switch；Each point
Its corresponding select lines is connected respectively with the control terminal of switch；Each point is connected with a path terminal of switch and is counted with first
It is connected according to line；Each point of corresponding a plurality of second data being respectively connected to another path terminal of switch in display panel
Line；
When display panel powered-off fault, time schedule controller inputs the first control to a plurality of select lines of Demultiplexing circuitry
Signal processed, a plurality of select lines open dividing in Demultiplexing circuitry with switch, connect the first data cable and corresponding second and count
According to line.
Further, during n=3, the circuit subelement includes three points with switch；The select lines is three；It is described
Data drive circuit passes through three by a first data cable output data voltage to corresponding circuit subelement, circuit subelement
A described point is respectively exported data voltage to corresponding three the second data cables of display panel with switch.
Further, the display panel includes crisscross a plurality of second data cable, multi-strip scanning line and by the
Two data cables and scan line intersect the multiple subpixel areas limited；The subpixel area includes red subpixel areas, indigo plant
Any one in sub-pixels region or green subpixel areas；During n=3, corresponding three second numbers of the first data cable
Data voltage is inputted to red subpixel areas, blue subpixel areas and the sub- picture of green into display panel respectively according to line
Plain region.
Further, described point is thin film transistor (TFT) with switch.
The invention also discloses a kind of method for improving display panel power down splashette, suitable for above-mentioned liquid crystal display device,
The method includes the steps：Time schedule controller monitoring display panel whether powered-off fault；When display panel powered-off fault, sequential
Controller produces first control signal input Demultiplexing circuitry, and produces second control signal and input to control of discharge electricity
Road；Demultiplexing circuitry connects the first data cable of data drive circuit and corresponding display panel when receiving first control signal
A plurality of second data cable；Charge/discharge control circuit connects a plurality of second number of corresponding display panel when receiving second control signal
According to line and ground terminal cabling.
Further, the first control signal is high level level.
Further, the second control signal is high level level.
Compared with prior art, the present invention is simply increased by increasing charge/discharge control circuit in liquid crystal display device
Several switches, when display panel power supply power-fail occurs suddenly, can greatly improve the power down speed of data voltage, by data electricity
Pressure rapidly moves ground to, and does not influence normal use.
Brief description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, the present invention is given furtherly
It is bright.
Fig. 1 is Demux circuit position schematic diagrames；
Fig. 2 is 1:The circuit diagram of 3demux circuits；
Fig. 3 is the circuit diagram of one embodiment of liquid crystal display device of the present invention；
Fig. 4 is the structure diagram of one embodiment of liquid crystal display device of the present invention；
Fig. 5 is the schematic diagram of a red subpixel areas of liquid crystal display device of the present invention；
Fig. 6 is the signal timing diagram of one embodiment of liquid crystal display device of the present invention.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically show in each figure, they are not represented
Its practical structures as product.In addition, so that simplified form readily appreciates, there is identical structure or function in some figures
Component, only symbolically depicts one of those, or has only marked one of those.Herein, "one" is not only represented
" only this ", can also represent the situation of " more than one ".
A kind of liquid crystal display device, including display panel, Demultiplexing circuitry, data drive circuit and time schedule controller；
The data drive circuit passes through the first data cable output data voltage to the Demultiplexing circuitry；The Demultiplexing circuitry
Data voltage is inputted into a plurality of second data cable corresponding with the first data cable to display panel, second data cable respectively
Quantity be n times of quantity of the first data cable, wherein n >=1, n are positive integer, are further included：Multiple charge/discharge control circuits；Institute
Charge/discharge control circuit is stated to correspond with first data cable；The charge/discharge control circuit includes first film transistor；The
The source electrode of one thin film transistor (TFT) connects corresponding first data cable；The drain electrode connection ground terminal cabling of first film transistor；The
The grid connection time schedule controller of one thin film transistor (TFT)；Time schedule controller is used to produce first when monitoring display panel power down
Control signal inputs Demultiplexing circuitry, and produces second control signal input charge/discharge control circuit；When receiving described
During one control signal, the Demultiplexing circuitry connects the first data cable and corresponding second data cable；When receiving described
During two control signals, the first film transistor of the charge/discharge control circuit is opened, by corresponding second data cable and ground terminal
Cabling connects.
Specifically, Demultiplexing circuitry includes multiple circuit subelements corresponding with the first data cable and n bar select lines；
The circuit subelement includes n points with switch, point is thin film transistor (TFT) with switch, each point with switch respectively with select lines
Correspond；Each point connects its corresponding select lines respectively with the control terminal of switch；An each point of path terminal with switch
It is connected and is connected with the first data cable；The each point of correspondence being respectively connected to another path terminal of switch in display panel
A plurality of second data cable.
The liquid crystal display device of the present invention includes Demultiplexing circuitry (demux circuits), the ratio of the Demultiplexing circuitry
The second data cable quantity that example can be needed in the first data cable quantity and display panel according to data drive circuit carries out true
It is fixed.The quantity of select lines is depending on the ratio of the Demultiplexing circuitry of actual use.
Assuming that the first data cable quantity of data drive circuit is 40, the second data cable quantity needed in display panel is
120, the quantity of the second data cable is 3 times of the quantity of the first data cable, then n=3, using 1:3 Demultiplexing circuitry, by 1
The voltage of the first data cable of bar output is separately input in 3 the second data cables, then by the second data cable that data voltage is defeated
Enter into the pixel region of display panel.
The quantity of circuit subelement is identical with the quantity of the first data cable, then is also 40, select lines is 3, and each electricity
Way unit includes using switch dividing for quantity identical with select lines, i.e., 3.
The charge/discharge control circuit is corresponded with first data cable, then charge/discharge control circuit is also 40.
Fig. 3 is the circuit diagram of one embodiment of liquid crystal display device of the present invention.As shown in figure 3, with 1:3 multichannels
Exemplified by point using circuit, during n=3, wherein the quantity of select lines then sets 3, is denoted as SWR, SWG, SWB respectively.
I.e.：Dividing for circuit subelement corresponds to red sub-pixel unit, the sub- picture of green respectively with switch in Demultiplexing circuitry
Plain unit and blue subpixels unit.
When the color of color membrane substrates is RGBW, n=4, i.e., with four sub-pixel units, correspond to red sub-pixel respectively
Unit, green sub-pixels unit, blue subpixels unit and white sub-pixels unit.
Each circuit subelement includes 3 points with switching, and data drive circuit exports number by 1 the first data cable S1
According to voltage to corresponding circuit subelement, 3 points through oversampling circuit subelement are respectively exported data voltage to display with switch
Corresponding 3 the second data cables (R1, G1, B1 are marked in Fig. 3) of panel.
3 points of control terminals with switch connect corresponding select lines, i.e.,：First point of setting is with switch, second point with switch
Connected with the 3rd point with switch, first point of control terminal connection select lines SWR with switch, first point of path terminal with switch
Corresponding second data cable, second point of control terminal with switch connect select lines SWG, second point of path terminal with switch
Corresponding second data cable is connected, the 3rd point of control terminal with switch connects select lines SWB, a 3rd point of path with switch
End connects corresponding second data cable, first point of another path terminal, second point of another path terminal with switch with switch
It is connected with each other with the 3rd point with another path terminal of switch and is connected to the first data cable.It is thin that charge/discharge control circuit includes first
Film transistor (Q1, Q2 ... in Fig. 3), first film transistor is metal-oxide-semiconductor.
Grid connection second control signal, that is, common electric voltage VSS (time schedule controller outputs second of first film transistor
The grid connection time schedule controller of control signal, i.e. first film transistor), the first number of source electrode connection of first film transistor
According to line, the grounded drain of first film transistor.
Fig. 4 is the structure diagram of one embodiment of liquid crystal display device of the present invention.As shown in figure 4, specifically, display
Panel is including crisscross a plurality of second data cable, multi-strip scanning line (not shown) and by the second data cable and sweeps
Retouch line and intersect the pixel region limited.The pixel region includes red subpixel areas, blue subpixel areas and green
Subpixel area.
During n=3, the first data cable S1 corresponding three described second data cable R1, G1, B1 respectively input data voltage
Red subpixel areas, blue subpixel areas and green subpixel areas into display panel.
By taking red subpixel areas as an example, Fig. 5 is showing for a red subpixel areas of liquid crystal display device of the present invention
It is intended to.Red subpixel areas includes a TFT transistors and a red sub-pixel electrode, the grid connection scanning of TFT transistors
Line, source electrode connect the second data cable, drain electrode connection red sub-pixel electrode.
Fig. 6 is the signal timing diagram of one embodiment of liquid crystal display device of the present invention.Souce represents data electricity in Fig. 6
Pressure, time schedule controller normally inputs the waveform of the signal of charge/discharge control circuit in display panel with the abnormal stage, such as VSS in Fig. 6
It is shown.SWR, SWG, SWB are three select lines, and time schedule controller normally inputs three select lines in display panel with the abnormal stage
Signal as shown in Figure 4.
The stage is normally shown in display panel, and the signal waveform of 3 select lines input of Demultiplexing circuitry is staggeredly
Rectangular wave, corresponding 3 point of control are staggeredly opened with switch, at this time the second control signal, that is, public of input charge/discharge control circuit
Voltage VSS signals are low level level, and charge/discharge control circuit does not work.
In display panel powered-off fault, the first control signal that time schedule controller produces high level level inputs 3 respectively
Bar select lines SWR, SWG, SWB, i.e., shown in figure, the signal intensity of 3 select lines inputs is the signal of high level level so that
All points are opened with switch, due to dividing the two paths end with switch to connect the second data cable and the first data cable respectively,
In display panel powered-off fault, the second data cable and the connection of the first data cable.
Meanwhile the second control signal of time schedule controller generation high level level inputs each charge/discharge control circuit respectively,
Shown in figure, in the powered-off fault stage, the signal intensity of VSS is the signal of high level level, then each charge/discharge control circuit
First film transistor is opened, and the source electrode of first film transistor connects corresponding first data cable, the first film crystal
The drain electrode of pipe connects ground terminal cabling, then the first data cable is connected with ground terminal cabling.
Since the second data cable and the first data cable connect, and the first data cable is connected with ground terminal cabling, therefore, aobvious
When showing panel powered-off fault, the second data cable is connected with ground terminal cabling, then the second data cable discharges rapidly, connection second
The residual electricity of each pixel electrode in the red subpixel areas of data cable, blue subpixel areas and green subpixel areas
Lotus is let go rapidly.
The disclosure further includes a kind of method for improving display panel power down splashette, suitable for above-mentioned liquid crystal display device, institute
Stating method includes step：Time schedule controller monitoring display panel whether powered-off fault；When display panel powered-off fault, sequential control
Device processed produces first control signal input Demultiplexing circuitry, and produces second control signal and input to charge/discharge control circuit；
Demultiplexing circuitry connects the first data cable of data drive circuit and corresponding display panel when receiving first control signal
A plurality of second data cable；Charge/discharge control circuit connects a plurality of second data of corresponding display panel when receiving second control signal
Line and ground terminal cabling.
The first control signal is high level level, and the second control signal is high level level.
The contents such as the interaction of this method described information, implementation procedure and above device embodiment are based on same design, specific interior
Hold the narration that can be found in apparatus of the present invention embodiment, details are not described herein again.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, do not departing from the premise of the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of liquid crystal display device, including display panel, Demultiplexing circuitry, data drive circuit and time schedule controller；Institute
State data drive circuit and pass through the first data cable output data voltage to the Demultiplexing circuitry；The Demultiplexing circuitry point
Data voltage is not inputted into a plurality of second data cable corresponding with the first data cable to display panel, second data cable
Quantity is n times of the quantity of the first data cable, wherein n >=1, and n is positive integer, it is characterised in that is further included：
Multiple charge/discharge control circuits；The charge/discharge control circuit is corresponded with first data cable；The control of discharge electricity
Road includes first film transistor；The source electrode of first film transistor connects corresponding first data cable；First film transistor
Drain electrode connection ground terminal cabling；The grid connection time schedule controller of first film transistor；
Time schedule controller is used to produce first control signal input Demultiplexing circuitry when monitoring display panel power down, and
Produce second control signal input charge/discharge control circuit；
When receiving the first control signal, the Demultiplexing circuitry connects the first data cable and corresponding second data
Line；When receiving the second control signal, the first film transistor of the charge/discharge control circuit is opened, by corresponding the
Two data cables are connected with ground terminal cabling.
2. liquid crystal display device according to claim 1, it is characterised in that the Demultiplexing circuitry includes and the first number
According to the corresponding multiple circuit subelements of line and n bar select lines；The circuit subelement includes n points with switching, and each point is used
Switch is corresponded with select lines respectively；Each point connects its corresponding select lines respectively with the control terminal of switch；Each point is used
One path terminal of switch is connected and is connected with the first data cable；Each point is respectively connected to another path terminal of switch
Corresponding a plurality of second data cable in display panel；
When display panel powered-off fault, time schedule controller inputs the first control letter to a plurality of select lines of Demultiplexing circuitry
Number, a plurality of select lines opens dividing in Demultiplexing circuitry with switch, connects the first data cable and corresponding second data cable.
3. liquid crystal display device according to claim 2, it is characterised in that during n=3, the circuit subelement includes three
A point with switch；The select lines is three；The data drive circuit by a first data cable output data voltage extremely
Corresponding circuit subelement, circuit subelement are respectively exported data voltage to display panel with switch by described in three points
Corresponding three the second data cables.
4. liquid crystal display device according to claim 3, the display panel includes crisscross a plurality of described second
Data cable, multi-strip scanning line and the pixel region limited by the second data cable and scan line intersection；The pixel region includes
Red subpixel areas, blue subpixel areas and green subpixel areas；
During n=3, corresponding three second data cables of the first data cable respectively input data voltage into display panel
Red subpixel areas, blue subpixel areas and green subpixel areas.
5. liquid crystal display device according to claim 2, described point is thin film transistor (TFT) with switch.
A kind of 6. method for improving display panel power down splashette, suitable for any one claim institute of the claims 1-5
The liquid crystal display device stated, it is characterised in that the method includes the steps：
Time schedule controller monitoring display panel whether powered-off fault；
When display panel powered-off fault, time schedule controller produces first control signal input Demultiplexing circuitry, and produces
Second control signal is inputted to charge/discharge control circuit；
Demultiplexing circuitry connects the first data cable of data drive circuit and corresponding display surface when receiving first control signal
A plurality of second data cable of plate；
Charge/discharge control circuit connects a plurality of second data cable and ground terminal of corresponding display panel when receiving second control signal
Cabling.
7. the method according to claim 6 for improving display panel power down splashette, it is characterised in that the first control letter
Number it is high level level.
8. the method according to claim 6 for improving display panel power down splashette, it is characterised in that the second control letter
Number it is high level level.
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| CN201711295916.4A CN107909979A (en) | 2017-12-08 | 2017-12-08 | Liquid crystal display device and the method for improving display panel power down splashette |
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| CN111028804A (en) * | 2019-12-19 | 2020-04-17 | 福建华佳彩有限公司 | Demux driving method |
| CN111028804B (en) * | 2019-12-19 | 2021-10-26 | 福建华佳彩有限公司 | Demux driving method |
| CN111243542A (en) * | 2020-02-27 | 2020-06-05 | Tcl华星光电技术有限公司 | Display device and display driving method thereof |
| CN112669749A (en) * | 2020-12-28 | 2021-04-16 | 合肥维信诺科技有限公司 | Display panel, driving method thereof and display device |
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