CN104157257A - Display controller, display control method and display device - Google Patents
Display controller, display control method and display device Download PDFInfo
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- CN104157257A CN104157257A CN201410431539.2A CN201410431539A CN104157257A CN 104157257 A CN104157257 A CN 104157257A CN 201410431539 A CN201410431539 A CN 201410431539A CN 104157257 A CN104157257 A CN 104157257A
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Abstract
The invention provides a display controller, a display control method and a display device and belongs to the field of display. The display controller comprises a control module, the control module is used for detecting input supply voltage when a display panel is shut down, and after an opening signal and a closing signal of a grid electrode are started and communicated through the control module, the opening signal and the closing signal are input to substrate wires on the two sides of a display substrate. Through the display controller, the display control method and the display device, the inrush current of the wires caused by remnant tides of shutdown can be improved, current of contact terminals and a WOA is reduced, and reliability is improved.
Description
Technical field
The present invention relates to display technique field, relate in particular to a kind of display controller, display control method and display device.
Background technology
Fig. 1 is the equivalent electrical circuit of Thin Film Transistor-LCD in prior art.As shown in Figure 1, the matrix form Thin Film Transistor-LCD of one (m) x (n) comprises: source electrode distribution 100, the source signal of thin film transistor (TFT) 102; Gate wirings 101, provide thin film transistor (TFT) 102 grid cut-in voltage with close voltage, the drain electrode of thin film transistor (TFT) 102 is connected to liquid crystal pixel 103.
When the white picture of Display panel, liquid crystal pixel 103 electric charges are charged to maximum, now, gate wirings 101 is all received grid and is closed voltage (VGL), make thin film transistor (TFT) present closed condition, liquid crystal pixel 103 internal charge almost do not have leakage current Ioff, make panel can show white picture; If now input power is closed, VGL voltage can slowly discharge and get back to 0 volt, because VGL voltage is high, cannot not make thin film transistor (TFT) 102 have larger Ioff electric current, thus liquid crystal pixel 103 electric charges cannot be discharged, thereby produce power-off ghost shadow.
Fig. 2 is display base plate one side group plate cabling schematic diagram in prior art, as shown in Figure 2, circuit trace is set directly to (Wire-On-Array on glass substrate, WOA) by the cabling serial connection (cascade) on this glass substrate, each drives chip, power supply signal is as XON, VGH, VGL etc. input each grid drive chip by described WOA, are the common designs of LCD gate plate drive end.
Panel is all used traditional solution morning and evening tides technical scheme at present, when detecting input voltage when too low, starting full grid start signal XON removes to control all grid cablings and all receives grid cut-in voltage VGH, this VGH voltage removes to open the inner all thin film transistor (TFT) TFT of panel, allows the electric current change of TFT leak greatly the electric charge remaining in liquid crystal.But in panel large scale and more under high resolving power condition more; conventionally can when shutdown, separate morning and evening tides circuit makes VGH voltage cause the large electric current of IGH (Surge current) under doing; the large electric current of this IGH need flow through contact terminal and glass cabling, the large electric current of IGH may cause contact terminal reliability problems all on path.
Summary of the invention
In view of this, in order to overcome defect of the prior art, the invention provides a kind of display controller, display control method and display device, this patent can improve the shortcoming that this power-off ghost shadow is used solution morning and evening tides countermeasure to produce, by display controller circuit, connect with distribution in face, reach grid and close voltage VGH and grid and close substrate cabling WOA and the contact terminal number of voltage VGL and can shunt the large electric current that shutdown morning and evening tides produces, reduce the electric current of contact terminal and WOA and promote the reliability of display device.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:
On the one hand, provide a kind of display controller, comprising:
Control module, for when display panel shuts down, detects the supply voltage of input, by inputting the substrate cabling of display base plate both sides after this control module startup UNICOM's grid start signal and grid shutdown signal.
Further, one side group plate cabling of described display base plate comprises: the first cabling, the second cabling, the 3rd cabling, the opposite side substrate cabling of described substrate comprises: the 4th cabling, the 5th cabling, the 6th cabling, wherein, first, fourth cabling is used for transmitting off signal, the second, five cablings are used for transmitting this grid start signal, and the 3rd, six cablings are used for transmitting this grid shutdown signal.
Further, this first cabling activation is connected to the odd gates driver of this substrate one side, by bypass mode disabled, is connected to even number gate drivers; The 4th cabling activation connects the even number gate drivers of this substrate opposite side, by bypass mode disabled, is connected to odd gates driver.
Further, this first cabling activation connects the even number gate drivers of this substrate one side, by bypass mode disabled, is connected to odd gates driver; The 4th cabling activation connects the odd gates driver of this substrate opposite side, by bypass mode disabled, is connected to even number gate drivers.
Further, described control module connects power module, and described supply voltage is input to this control module by described power module.
Further, described control module comprises:
The first switch element, is set to N-type MOSFET pipe, and the grid of described the first switch element is in order to receive off signal, and the source electrode of described the first switch element connects the first circuit access supply voltage, and the drain electrode of described the first switch element is connected with ground voltage;
Second switch unit, for N-type MOSFET pipe, the grid of described second switch unit is connected with the source electrode of described the first switch element, the source electrode that described second switch unit is set connects the second resistance access grid cut-in voltage, and the drain electrode of described second switch unit connects the 3rd resistance access ground voltage;
The 3rd switch element, is set to P type MOSFET pipe, and the drain electrode of described the 3rd switch element connects grid shutdown signal, and the source electrode of described the 3rd switch element is connected with grid, and access grid start signal.
One embodiment of the invention also provides a kind of display control method, when display panel shuts down, detect the input of input supply voltage, off signal is input to the grid of the first switch, the source electrode high level of described the first switch is received again the grid of second switch, after described second switch is opened, by this high level of electric resistance partial pressure, obtain the grid voltage of the 3rd switch, when the grid voltage of described the 3rd switch is lower than grid start signal voltage, just obtain the grid of described the 3rd switch, source voltage is less than zero volt and opens the 3rd switch, grid start signal and grid shutdown signal are connected.
One embodiment of the invention also provides a kind of display device, comprises above-mentioned display controller.
Compared with prior art, its advantage is in the present invention:
1. can improve power-off ghost shadow problem, particularly be applied in large scale and resolution panels.
2. by XON control signal cabling odd even in simple power circuit and face, configure, dispersible the large electric current that power-off ghost shadow brings.
3. increase the numbers of terminals that power-off ghost shadow countermeasure causes large electric current wiring path, increases contact, increase terminal reliability.
4. the circuit in loop is simple, and does not increase WOA cabling space.
Accompanying drawing explanation
Fig. 1 is the equivalent electrical circuit of Thin Film Transistor-LCD in prior art;
Fig. 2 is display base plate one side group plate cabling schematic diagram in prior art;
Fig. 3 is display base plate one side group plate cabling schematic diagram of the present invention;
Fig. 4 is gate drivers control signal sequential chart of the present invention;
Fig. 5 is display base plate one side group plate the first cabling schematic diagram of the present invention;
Fig. 6 is one embodiment of the invention display base plate both sides substrate cabling schematic diagram;
Fig. 7 is one embodiment of the invention control module circuit diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
Inventive embodiment causes contact terminal that the electric current of surging of cabling causes and the reliability problem of WOA for the morning and evening tides that shuts down in prior art.
One embodiment of the invention provides a kind of display controller, comprise: control module, for when display panel shuts down, detect the supply voltage of input, by inputting the substrate cabling of display base plate both sides after grid start signal described in this control module startup UNICOM and described grid shutdown signal.
Wherein, in panel, to configure XON cabling, XON cabling only connects the gate drivers (Gate Driver) of half, this function is not directly used in the XON control pin position of the gate drivers of half (Gate Driver) in addition, only has bypass mode (bypass) control signal XON.
Wherein, detecting input supply voltage, has a switch to be connected in the middle of VGH and VGL, at supply voltage lower than threshold voltage be connected VGH and VGL of starting switch.
Fig. 3 is display base plate one side group plate cabling schematic diagram of the present invention.As shown in Figure 3, when power-off ghost shadow countermeasure starts for shutdown, half grid is all received VGH, and half grid is all received VGL, and power-off ghost shadow countermeasure causes electric current for example, and 1A electric current can be walked VGH cabling=0.5A; Can walk VGL cabling=0.5A, this condition 1A electric current will be shunted half and flow through terminals all on VGH/VHL path and cabling.The method can reduce terminal and cabling because of the caused electric current of power-off ghost shadow countermeasure.
Fig. 4 is gate drivers control signal sequential chart of the present invention, as shown in Figure 4, the gate drivers of countermeasure proposed by the invention (Gate Driver) need to have the function of XON, the control signal sequential of XON as shown in Figure 4, namely during XON=High level, gate drivers (Gate Driver) can drive by normal scan, when XON=Low level, and the whole passage Dou Jie of Gate Driver road VGH level.
Fig. 5 is display base plate one side group plate the first cabling schematic diagram of the present invention.As shown in Figure 5, the WOA cabling of countermeasure that this patent proposes, XON only meets half Gate Driver, and half Gate Driver is bypass control signal XON.
The embodiment that this patent is carried is divided into two parts, comprises the inner trace configurations of panel and drives loop two parts, below describes in detail respectively.
Fig. 6 is one embodiment of the invention display base plate both sides substrate cabling schematic diagram.As shown in Figure 6, the inner trace configurations part of panel, supposes that panel is bilateral gate wirings framework, and at the WOA on panel left side cabling, its XON signal wiring only connects the gate drivers of odd number, and does not connect the gate drivers of not doing moving even number; At the WOA cabling on panel the right, its XON signal wiring only connects the gate drivers of even number, and does not connect the gate drivers of not doing moving odd number, on the contrary or phase distribution.Its order ground is for only connecting XON signal wiring to the gate drivers of half number.
Particularly, one side group plate cabling of described display base plate comprises: the first cabling, the second cabling, the 3rd cabling, the opposite side substrate cabling of described substrate comprises: the 4th cabling, the 5th cabling, the 6th cabling, wherein, first, fourth cabling is used for transmitting off signal, the second, five cablings are used for transmitting this this grid start signal, and the 3rd, six cablings are used for transmitting this grid shutdown signal.
Because will share and symmetrical factor when gate drivers is made, so XON signal terminal will be divided into two terminals, input individually, one is that bypass terminal removes to transmit XON signal, one is that activation terminal removes to move gate drivers.At the WOA on panel left side cabling, its XON signal wiring only connects the gate drivers of odd number, and namely the XON of the gate drivers of odd number receives activation terminal, and the XON of the gate drivers of even number receives bypass terminal, and the rest may be inferred.
As an embodiment, this first cabling activation is connected to the odd gates driver of this substrate one side, by bypass mode disabled, is connected to even number gate drivers; The 4th cabling activation connects the even number gate drivers of this substrate opposite side, by bypass mode disabled, is connected to odd gates driver.
As another embodiment, this first cabling activation connects the even number gate drivers of this substrate one side, by bypass mode disabled, is connected to odd gates driver; The 4th cabling activation connects the odd gates driver of this substrate opposite side, by bypass mode disabled, is connected to even number gate drivers.
Wherein, XON signal is that the whole delivery channel numbers of control gate driver all force to receive VGH voltage.When XON=high level, the whole delivery channel numbers of gate drivers are not received VGH voltage, but are controlled by controlling instruction STV and CLKV, open in proper order each channel, normal scan panel.When XON=Low level, the whole delivery channel numbers of gate drivers all force to receive VGH voltage.
XON=Low level when shutdown occurs, does the gate wirings cabling that moving grid driver connects and all can rise to VGH voltage having, and this VGH voltage can effectively leak liquid crystal pixel internal charge, reaches improving shutdown ghost shadow.
Wherein, described control module connects power module, and described supply voltage Vin is input to this control module by described power module.
Fig. 7 is this embodiment of the invention control module circuit diagram.As shown in Figure 7, described control module comprises:
Described the first switch element is N-type MOSFET pipe, and the grid of described the first switch element is in order to receive off signal, and the source electrode of described the first switch element connects R1 access supply voltage, and the drain electrode of described the first switch element is connected with ground voltage;
Described second switch unit is N-type MOSFET pipe, the grid of described second switch unit is connected with the source electrode of described the first switch element, the source electrode of described second switch unit connects R2 access grid cut-in voltage, and the drain electrode of described second switch unit connects R3 access ground voltage;
Described three switch elements are P type MOSFET pipe, and the drain electrode of described the 3rd switch element connects grid shutdown signal, and the source electrode of described the 3rd switch element is connected with grid, and access grid start signal.
Particularly, power supply comprises input voltage (Vin) the level mechanism that a detecting power circuit provides, when Vin voltage is when setting threshold voltage, and XON=High level; When Vin voltage is when setting threshold voltage, XON=Low level, below makes the following instructions according to above-mentioned two kinds of conditions:
1.XON=High level (while normally working)
XON receives inner half the Gate Driver of panel, and XON=High level can not start all passages of Gate Driver and all receive VGH, and Gate Driver only can normally work, P-SCAN driving grid signal wire.
XON receive Q1 grid can Turn On Q1,, Q1 source electrode is received again Q2 grid, Q1 Turn On makes Q1 source electrode=Low level and cannot Turn On Q2, so Q2 source electrode is also VGH voltage and to cause the lock source voltage of Q3 be zero and cannot Turn On Q3.Under this condition, Q3 cannot Turn On, and VGH and VGL voltage are just independent and be not connected respectively.
2.XON=Low level (shutdown occurs rear)
XON receives inner half the Gate Driver of panel, and XON=Low level can start all passages of Gate Driver and all receive VGL, and Gate Driver can normally not work, can P-SCAN driving grid signal wire yet.
XON receives Q1 grid can Turn On Q1, Q1 source electrode=High level is received again Q2 grid and is made Q2 by Turn On, Q2 obtains the grid voltage of Q3 by R2 and R3 dividing potential drop VGH after by Turn On, design the grid voltage of this Q3 lower than VGH, the lock source voltage that just can obtain Q3 is less than zero volt and can drives Q3, and Turn On Q3 just can make VGH and VGL voltage be connected.
Another embodiment of the present invention also provides a kind of display control method, when display panel shuts down, detect the input of input supply voltage, off signal is input to the grid of the first switch, the source electrode high level of described the first switch is received again the grid of second switch, after described second switch is opened, by this high level of electric resistance partial pressure, obtain the grid voltage of the 3rd switch, when the grid voltage of described the 3rd switch is lower than grid start signal voltage, just obtain the grid of described the 3rd switch, source voltage is less than zero volt and opens the 3rd switch, grid start signal and grid shutdown signal are connected.
Further embodiment of this invention also provides a kind of display device, comprises display controller as above.Wherein, the same above-described embodiment of the structure of described display controller and principle of work, does not repeat them here.In addition, the structure of other parts of display device can, with reference to prior art, be not described in detail this herein.This display device can be: liquid crystal panel, Electronic Paper, OLED (Organ driver Light Emitting Diode, Organic Light Emitting Diode) panel, LCD TV, liquid crystal display, digital album (digital photo frame), mobile phone, panel computer etc. have product or the parts of any Presentation Function.
The undeclared part that relates in the present invention is same as the prior art or adopt prior art to be realized.Be noted that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a display controller, comprising:
Control module, for when display panel shuts down, detects the supply voltage of input, by inputting the substrate cabling of display base plate both sides after this control module startup UNICOM's grid start signal and grid shutdown signal.
2. display controller according to claim 1, it is characterized in that: a side group plate cabling of described display base plate comprises: the first cabling, the second cabling, the 3rd cabling, the opposite side substrate cabling of described substrate comprises: the 4th cabling, the 5th cabling, the 6th cabling, wherein, first, fourth cabling is used for transmitting off signal, the second, five cablings are used for transmitting this grid start signal, and the 3rd, six cablings are used for transmitting this grid shutdown signal.
3. display controller according to claim 2, is characterized in that: this first cabling activation is connected to the odd gates driver of this substrate one side, by bypass mode disabled, is connected to even number gate drivers; The 4th cabling activation connects the even number gate drivers of this substrate opposite side, by bypass mode disabled, is connected to odd gates driver.
4. display controller according to claim 2, is characterized in that: this first cabling activation connects the even number gate drivers of this substrate one side, by bypass mode disabled, is connected to odd gates driver; The 4th cabling activation connects the odd gates driver of this substrate opposite side, by bypass mode disabled, is connected to even number gate drivers.
5. according to the display controller described in claim 1-4 any one, it is characterized in that: described control module connects power module, and described supply voltage is input to this control module by described power module.
6. display controller according to claim 1, is characterized in that: described control module comprises:
The first switch element, is set to N-type MOSFET pipe, and the grid of described the first switch element is in order to receive off signal, and the source electrode of described the first switch element connects the first circuit access supply voltage, and the drain electrode of described the first switch element is connected with ground voltage;
Second switch unit, for N-type MOSFET pipe, the grid of described second switch unit is connected with the source electrode of described the first switch element, the source electrode that described second switch unit is set connects the second resistance access grid cut-in voltage, and the drain electrode of described second switch unit connects the 3rd resistance access ground voltage;
The 3rd switch element, is set to P type MOSFET pipe, and the drain electrode of described the 3rd switch element connects grid shutdown signal, and the source electrode of described the 3rd switch element is connected with grid, and access grid start signal.
7. a display control method, comprise: when display panel shuts down, detect the input of input supply voltage, off signal is input to the grid of the first switch, the source electrode high level of described the first switch is received again the grid of second switch, after described second switch is opened, by this high level of electric resistance partial pressure, obtain the grid voltage of the 3rd switch, when the grid voltage of described the 3rd switch is lower than grid start signal voltage, just obtain the grid of described the 3rd switch, source voltage is less than zero volt and opens the 3rd switch, grid start signal and grid shutdown signal are connected.
8. a display device, is characterized in that, comprises the display controller as described in any one in claim 1-6.
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| CN201410431539.2A CN104157257A (en) | 2014-08-27 | 2014-08-27 | Display controller, display control method and display device |
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| CN105185332A (en) * | 2015-09-08 | 2015-12-23 | 深圳市华星光电技术有限公司 | Liquid crystal display panel, driving circuit thereof and manufacturing method thereof |
| CN105448257A (en) * | 2015-12-23 | 2016-03-30 | 南京中电熊猫液晶显示科技有限公司 | DC/DC power source converter connected with liquid crystal display panel |
| CN111179873A (en) * | 2020-02-19 | 2020-05-19 | 京东方科技集团股份有限公司 | Shutdown noise reduction circuit, shutdown noise reduction chip and display device |
| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
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| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
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Application publication date: 20141119 |