CN104376819A - System and method for driving liquid crystal display device - Google Patents
System and method for driving liquid crystal display device Download PDFInfo
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- CN104376819A CN104376819A CN201310354768.4A CN201310354768A CN104376819A CN 104376819 A CN104376819 A CN 104376819A CN 201310354768 A CN201310354768 A CN 201310354768A CN 104376819 A CN104376819 A CN 104376819A
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Abstract
The invention provides a system and method for driving a liquid crystal display device. The system comprises a comparator, a processor and a controller. The processor is electrically connected to the in-phase input end of the comparator. The processor outputs a trigger voltage to the in-phase input end, and the trigger voltage is a data voltage or a scanning voltage. The controller is electrically connected to the power input end of the comparator. The controller outputs a first public voltage to the power input end, and the first public voltage is at a low level in a first period and a high level in a second period and a third period, wherein the first period, the second period and the third period are continuous periods in sequence. The voltage of an inverted input end is a reference voltage, and when the trigger voltage is higher than the reference voltage, the output end outputs second public voltage, wherein the second public voltage is at a low level in the first period and the second period and a high level in the third period. The system and method for driving the liquid crystal display device can achieve delayed output of the public voltage.
Description
Technical field
The present invention relates to a kind of LCD device droving system and driving method thereof, particularly relate to a kind of LCD device droving system and the driving method thereof that make common electric voltage delay output.
Background technology
Liquid crystal display, because having lightweight, little power consumption and the feature such as radiation is little, has now been widely used in the fields such as mobile phone, personal digital assistant, mobile computer and TV.In general Thin Film Transistor-LCD, the displaying principle of image is: by changing the voltage loading on each pixel region, control liquid crystal molecule windup-degree with the electric field changing the liquid crystal molecule both sides corresponding with this pixel region, and then the luminous flux controlling this pixel region realizes.And the pixel voltage of each pixel region is determined by common electric voltage and data voltage, as shown in Figure 1, be conventional art data voltage Vs ' and common electric voltage VCOM ' sequential chart.During due to power-on, that first rise is common electric voltage VCOM ', as shown in Figure 1, common electric voltage VCOM ' is low level at period 1 t1, and is high level when t2 and period 3 t3 second round, but, data voltage Vs ' triggers owing to can lag behind common electric voltage VCOM ', as shown in Figure 1, data voltage Vs ' period 1 t1, second round t2 be low level, be just high level when period 3 t3; Therefore, when liquid crystal display is in this second round of t2, data voltage Vs ' is low level, common electric voltage VCOM ' is high level, and because pixel voltage is by data voltage Vs ' and common electric voltage VCOM ' co-controlling, pixel voltage is now the difference of data voltage Vs ' and common electric voltage VCOM ', pixel voltage is now non-vanishing, therefore, this liquid crystal molecule can twist, and now there will be the picture that flashes white instantaneously.
Summary of the invention
For solving the problem, the present invention proposes a kind of LCD device droving system and driving method thereof, realizes common electric voltage export and postpone by comparer, to flash white instantaneously the object of picture to reach elimination.
For achieving the above object, the present invention proposes a kind of LCD device droving system, comprises: comparer, processor and controller, and this comparer has in-phase input end, inverting input, power input and output terminal; This processor is electrically connected at this in-phase input end of this comparer, and this processor trigger output voltage is to this in-phase input end, and this trigger voltage is data voltage or scanning voltage for driving this liquid crystal indicator; This controller is electrically connected at this power input of this comparer, this controller exports the first common electric voltage to this power input, this first common electric voltage is low level within the period 1, be high level within second round, period 3, this period 1, this second round and this period 3 are continuous print cycle successively; Wherein, the voltage of this inverting input is reference voltage, and when this trigger voltage is greater than this reference voltage, this output terminal exports the second common electric voltage, this second common electric voltage is low level within this period 1, this second round, is high level within this period 3.
As optional technical scheme, this reverse inter-input-ing ending grounding.
As optional technical scheme, this processor comprises datawire driver, for exporting this data voltage.
As optional technical scheme, this processor comprises scan line driver, for exporting this scanning voltage.
As optional technical scheme, this drive system also comprises electric capacity, and this electric capacity has first end and the second end, and this first end is connected to this in-phase input end of this comparer, this second end ground connection.
The present invention more proposes a kind of liquid crystal display apparatus driving circuit, this liquid crystal indicator comprises comparer, this comparer has in-phase input end, inverting input, power input, the voltage of this inverting input is reference voltage, the method comprising the steps of: input the first common electric voltage to this power input, this first common electric voltage is low level within the period 1, be high level within second round, period 3, this period 1, this second round and this period 3 are continuous print cycle successively; Input trigger voltage is to this in-phase input end, and this trigger voltage is data voltage or scanning voltage for driving this liquid crystal indicator; Relatively this trigger voltage and this reference voltage, when this trigger voltage is greater than this reference voltage, export the second common electric voltage, this second common electric voltage is low level within this period 1, this second round, is high level within this period 3.
As optional technical scheme, this reverse inter-input-ing ending grounding.
As optional technical scheme, this data voltage is exported by datawire driver.
As optional technical scheme, this scanning voltage is exported by scan line driver.
As optional technical scheme, this in-phase input end is connected with electric capacity, the other end ground connection of this electric capacity.
Compared with prior art, LCD device droving system of the present invention and driving method thereof can compare by trigger voltage and reference voltage the output time controlling common electric voltage, thus realize common electric voltage and postpone to export.
Accompanying drawing explanation
Fig. 1 is conventional art data voltage and common electric voltage sequential chart.
Fig. 2 is LCD device droving system structural drawing of the present invention.
Fig. 3 is LCD device droving system block diagram of the present invention.
Fig. 4 is each voltage sequential chart of comparer of the present invention.
Embodiment
For making there is further understanding to object of the present invention, structure, feature and function thereof, embodiment is hereby coordinated to be described in detail as follows.
As shown in Figures 2 and 3, Fig. 2 is LCD device droving system structural drawing of the present invention, and Fig. 3 is LCD device droving system block diagram of the present invention.Drive system of the present invention comprises: comparer 300, processor 100 and controller 200, and this comparer 300 has in-phase input end 301, inverting input 302, power input 303 and output terminal 304; This processor 100 is electrically connected at this in-phase input end 301 of this comparer 300, and this processor 100 trigger output voltage Vp is to this in-phase input end 301, and this trigger voltage Vp is data voltage or scanning voltage for driving this liquid crystal indicator; This controller 200 is electrically connected at this power input 303 of this comparer 300, this controller 200 exports the first common electric voltage VCOM to this power input 303, as shown in Figure 4, for each voltage sequential chart of comparer of the present invention, this first common electric voltage VCOM is low level in period 1 T1, in second round T2, be high level in period 3 T3, this period 1 T1, this second round T2 and this period 3 T3 be continuous print cycle successively; The voltage of this inverting input 302 is reference voltage V n, when this trigger voltage Vp is greater than this reference voltage V n, this output terminal 304 exports the second common electric voltage VCOM_delay, as shown in Figure 4, this second common electric voltage VCOM_delay is low level this period 1 T1, this second round in T2, is high level in this period 3 T3.
As shown in Figure 3, the second common electric voltage VCOM_delay that comparer 300 exports can feed back and enter processor 100, then is controlled to carry out follow-up work by this processor 100.
As shown in Figures 2 to 4, in second round T2, power input 303 inputs this first common electric voltage VCOM, first common electric voltage VCOM in this second round T2 present high voltage, now, output terminal 304 does not export, only have when comparer 300 receives processor 100 trigger output voltage Vp to this in-phase input end 301, and when this comparer 300 judges that this trigger voltage Vp is greater than the reference voltage V n of this inverting input 302, this output terminal 304 just exports the second common electric voltage VCOM_delay, namely as shown in Figure 4, when entering period 3 T3, trigger voltage Vp presents high voltage, namely there is trigger voltage Vp to input to this comparer 300 when entering period 3 T3, now when comparer 300 judges that ground trigger voltage Vp is greater than the reference voltage V n of this inverting input 302, namely the second common electric voltage VCOM_delay is exported, namely this second common electric voltage VCOM_delay presents low level second round in T2, just high level is presented in period 3 T3.That is, this output terminal 304 exports the second common electric voltage VCOM_delay and this power input 303 and inputs between this first common electric voltage VCOM and have a temporal delay, namely be delayed second round this time period of T2, the first common electric voltage VCOM is equal with the voltage value of the second common electric voltage VCOM_delay reality.
Comparer 300 exports this second common electric voltage VCOM_delay the pixel region (not shown) of liquid crystal indicator to, this pixel region can receive the data voltage that liquid crystal indicator sends simultaneously, the time of trigger pip Vp is sent by control processor 100, can ensure that this data voltage and this second common electric voltage VCOM_delay same time export pixel region to, namely now the second common electric voltage VCOM_delay output and do not rely on the input of the first common electric voltage VCOM; The numerical value arranging this data voltage and this second common electric voltage VCOM_delay is equal, pixel voltage due to pixel region is the difference of this data voltage and this second common electric voltage VCOM_delay, now, pixel voltage is zero, the liquid crystal molecule of pixel region does not twist when pixel voltage is zero, namely the light that backlight module sends cannot by layer of liquid crystal molecule, and the complete black picture of now liquid crystal indicator display, namely there will not be the phenomenon that flashes white instantaneously.
As shown in Figure 2, inverting input 302 ground connection of the present invention, this drive system also comprises electric capacity 305, and this electric capacity has first end 3051 and the second end 3052, and this first end 3051 is connected to this in-phase input end 301 of this comparer 300, this second end 3052 ground connection.When processor 100 exports this trigger voltage Vp to this in-phase input end 301, this electric capacity 305 charges, and can ensure that the voltage keeps of this in-phase input end 301 is greater than the voltage of inverting input 302, thus ensures that the second common electric voltage VCOM_delay continues to export.
Trigger voltage Vp of the present invention can be data voltage or scanning voltage, and this processor 300 can comprise datawire driver, for exporting this data voltage; Or this processor 300 comprises scan line driver, for exporting this scanning voltage.But not as limit, such as at array base palte row cutting technology (Gate Driver OnArray, GOA) in, because scan drive circuit is directly produced on array base palte, replace scan line driver, therefore, now do not comprise scan line driver in this processor 100, and only need carry out gated sweep voltage by this processor 100 and be in noble potential, namely can be used as trigger voltage Vp and export.
The present invention proposes again a kind of liquid crystal display apparatus driving circuit, as shown in Figures 2 to 4, this liquid crystal indicator comprises comparer 300, this comparer 300 has in-phase input end 301, inverting input 302, power input 303, the voltage of this inverting input 302 is reference voltage V n, and the method comprising the steps of:
Input the first common electric voltage VCOM to this power input 301, this first common electric voltage VCOM is low level in period 1 T1, in second round T2, be high level in period 3 T3, this period 1 T1, this second round T2 and this period 3 T3 be continuous print cycle successively;
Trigger voltage Vp is to this in-phase input end 301 in input, and this trigger voltage Vp is data voltage or scanning voltage;
Relatively this trigger voltage Vp and this reference voltage V n, when this trigger voltage Vp is greater than this reference voltage V n, export the second common electric voltage VCOM_delay, this second common electric voltage VCOM_delay is low level this period 1 T1, this second round in T2, is high level in this period 3 T3.
Wherein, this inverting input 302 ground connection, this data voltage is exported by datawire driver, and this scanning voltage is exported by scan line driver, and this in-phase input end 302 is connected with electric capacity 305, the other end ground connection of this electric capacity 305.
In sum, LCD device droving system of the present invention and driving method are by increase comparer, and export data voltage or scanning voltage to this comparer by processor, the output time of common electric voltage is controlled by the comparison procedure of comparer, common electric voltage is made to postpone to export, ensure that pixel voltage is zero, thus prevent liquid crystal molecule from reversing in advance and occur flashing white instantaneously picture, for different machines, as long as by regulating the time of processor trigger output voltage, just can ensure that common electric voltage obtains most suitable time delay, thus the generation of picture of avoiding flashing white instantaneously.And the present invention is without the need to introducing other trigger pips, the data voltage using liquid crystal indicator itself to carry and scanning voltage, can realize the automatically delaying of common electric voltage, and structure is simple, easily realizes.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only enforcement example of the present invention.Must it is noted that the embodiment disclosed limit the scope of the invention.On the contrary, change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (10)
1. a LCD device droving system, is characterized in that comprising:
Comparer, this comparer has in-phase input end, inverting input, power input and output terminal;
Processor, this processor is electrically connected at this in-phase input end of this comparer, and this processor trigger output voltage is to this in-phase input end, and this trigger voltage is data voltage or scanning voltage for driving this liquid crystal indicator; And
Controller, this controller is electrically connected at this power input of this comparer, this controller exports the first common electric voltage to this power input, this first common electric voltage is low level within the period 1, be high level within second round, period 3, this period 1, this second round and this period 3 are continuous print cycle successively;
Wherein, the voltage of this inverting input is reference voltage, and when this trigger voltage is greater than this reference voltage, this output terminal exports the second common electric voltage, this second common electric voltage is low level within this period 1, this second round, is high level within this period 3.
2. LCD device droving system as claimed in claim 1, is characterized in that: this reverse inter-input-ing ending grounding.
3. LCD device droving system as claimed in claim 1, is characterized in that: this processor comprises datawire driver, for exporting this data voltage.
4. LCD device droving system as claimed in claim 1, is characterized in that: this processor comprises scan line driver, for exporting this scanning voltage.
5. LCD device droving system as claimed in claim 1, it is characterized in that: this drive system also comprises electric capacity, this electric capacity has first end and the second end, and this first end is connected to this in-phase input end of this comparer, this second end ground connection.
6. a liquid crystal display apparatus driving circuit, this liquid crystal indicator comprises comparer, and this comparer has in-phase input end, inverting input, power input, and the voltage of this inverting input is reference voltage, it is characterized in that the method comprising the steps of:
Input the first common electric voltage to this power input, this first common electric voltage is low level within the period 1, is high level within second round, period 3, and this period 1, this second round and this period 3 are continuous print cycle successively;
Input trigger voltage is to this in-phase input end, and this trigger voltage is data voltage or scanning voltage for driving this liquid crystal indicator;
Relatively this trigger voltage and this reference voltage, when this trigger voltage is greater than this reference voltage, export the second common electric voltage, this second common electric voltage is low level within this period 1, this second round, is high level within this period 3.
7. liquid crystal display apparatus driving circuit as claimed in claim 6, is characterized in that: this reverse inter-input-ing ending grounding.
8. liquid crystal display apparatus driving circuit as claimed in claim 6, is characterized in that: this data voltage is exported by datawire driver.
9. liquid crystal display apparatus driving circuit as claimed in claim 6, is characterized in that: this scanning voltage is exported by scan line driver.
10. liquid crystal display apparatus driving circuit as claimed in claim 6, is characterized in that: this in-phase input end is connected with electric capacity, the other end ground connection of this electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310354768.4A CN104376819A (en) | 2013-08-15 | 2013-08-15 | System and method for driving liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310354768.4A CN104376819A (en) | 2013-08-15 | 2013-08-15 | System and method for driving liquid crystal display device |
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| CN201310354768.4A Pending CN104376819A (en) | 2013-08-15 | 2013-08-15 | System and method for driving liquid crystal display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182918A (en) * | 2018-01-03 | 2018-06-19 | 惠科股份有限公司 | Liquid crystal display device and driving method thereof |
| WO2020082468A1 (en) * | 2018-10-25 | 2020-04-30 | 惠科股份有限公司 | Power supply voltage control circuit of display panel, display panel, and display apparatus |
-
2013
- 2013-08-15 CN CN201310354768.4A patent/CN104376819A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182918A (en) * | 2018-01-03 | 2018-06-19 | 惠科股份有限公司 | Liquid crystal display device and driving method thereof |
| WO2020082468A1 (en) * | 2018-10-25 | 2020-04-30 | 惠科股份有限公司 | Power supply voltage control circuit of display panel, display panel, and display apparatus |
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