CN202332231U - Driving circuit, liquid crystal panel module and liquid crystal display device - Google Patents
Driving circuit, liquid crystal panel module and liquid crystal display device Download PDFInfo
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- CN202332231U CN202332231U CN2011204966728U CN201120496672U CN202332231U CN 202332231 U CN202332231 U CN 202332231U CN 2011204966728 U CN2011204966728 U CN 2011204966728U CN 201120496672 U CN201120496672 U CN 201120496672U CN 202332231 U CN202332231 U CN 202332231U
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- liquid crystal
- thin film
- sweep trace
- film electric
- pixel thin
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Abstract
The utility model discloses a driving circuit, a liquid crystal panel module and a liquid crystal display device. The driving circuit of the liquid crystal display device comprises a scanning line, a digital line, a common line and a pixel film transistor. A source electrode of the pixel film transistor is connected with the digital line, a grid of the pixel film transistor is connected with the scanning line, and a controllable switch is connected between a drain of the pixel film transistor and the common line. The driving circuit, the liquid crystal panel module and the liquid crystal display device can reduce scanning time and improves charging rate of a pixel electrode.
Description
Technical field
The utility model relates to field of liquid crystal display, in particular, relates to a kind of driving circuit, liquid crystal panel module and liquid crystal indicator.
Background technology
Liquid crystal indicator comprises liquid crystal display drive circuit, and shown in Figure 1 is the equivalent driving circuit figure of the single picture element of a kind of existing membrane transistor (TFT) LCD (LCD), wherein G (n-1) and G (n) represent respectively last with when the bar sweep trace; The Com representative is at the common line of array base palte side (TFT side); T is expressed as the abbreviation of membrane transistor (TFT); And the CF_Com representative is at the common electrode of color filter side (CF side); C
STWith C
LCRepresent storage capacitors and liquid crystal capacitance respectively; Fig. 2 is its corresponding drive waveforms; Generally for fear of picture deterioration (deteriorate) or ghost situation such as (imagesticking); Can adopt ambipolar type of drive in time; That is the data current potential of a frame (frame) compares common current potential and wants high (positive polarity), then the current potential of next frame more common current potential low (negative polarity) just.But, therefore to an electric capacity that has been full of a kind of polarity be charged to the duration of charging that another polar orientation often needs the bigger membrane transistor of design current or increases picture element owing to often differ very big between the positive-negative polarity current potential.And the duration of charging of increase picture element can be reduced sweep frequency, influences the picture display quality; If increase the conducting electric current of membrane transistor, then increase the design and the manufacture difficulty of membrane transistor, promote cost.
The utility model content
The utility model technical matters to be solved provides a kind of charge rate, driving circuit, liquid crystal panel module and liquid crystal indicator in minimizing required duration of charging of picture element that improves picture element.
The purpose of the utility model realizes through following technical scheme:
A kind of LCD drive circuits; Comprise sweep trace, data line, common line and pixel thin film electric crystal; The source electrode of said pixel thin film electric crystal connects with said data line; Its grid connects with said sweep trace, is connected with gate-controlled switch between the drain electrode of said pixel thin film electric crystal and the said common line.
Preferably, last sweep trace of the sweep trace that is connected with said pixel thin film electric crystal of the control end of said gate-controlled switch connects.In order to guarantee the display quality of present frame picture, the electric weight of storage capacitors need be maintained to the next scan period.Therefore, reducing the required duration of charging of picture element, promoting under the prerequisite of charge rate, ensure image quality as much as possible; Carry previous sweep spacing conducting gate-controlled switch; It is proper that liquid crystal capacitance is carried out precharge, and therefore the sweep trace that the pixel thin film electric crystal connects and its last sweep trace adopt said last sweep trace control gate-controlled switch just in time at a distance from a sweep spacing; Can simplify circuit design and control mode, reduce cost.
Preferably, said gate-controlled switch comprises the precharge membrane transistor, and the source electrode of said precharge membrane transistor or drain electrode are connected with the drain electrode of said pixel thin film electric crystal; The drain electrode of said precharge membrane transistor or source electrode are connected with said common line; Last sweep trace of the sweep trace that the grid of said precharge membrane transistor is connected with said pixel thin film electric crystal connects.This is a kind of concrete gate-controlled switch form, adopts membrane transistor as gate-controlled switch, can when making the pixel thin film electric crystal, form synchronously, does not increase extra production process, helps promoting throughput rate, reduces cost.
A kind of liquid crystal panel comprises above-mentioned a kind of LCD drive circuits.
A kind of liquid crystal indicator; Comprise the liquid crystal panel module; Described liquid crystal panel module comprises driving circuit, and described driving circuit comprises sweep trace, data line, common line and pixel thin film electric crystal, and the source electrode of said pixel thin film electric crystal connects with said data line; Its grid connects with said sweep trace, is connected with gate-controlled switch between the drain electrode of said pixel thin film electric crystal and the said common line.
Last sweep trace of the sweep trace that the control end of said gate-controlled switch is connected with said pixel thin film electric crystal connects.
Said gate-controlled switch comprises the precharge membrane transistor, and the source electrode of said precharge membrane transistor or drain electrode are connected with the drain electrode of said pixel thin film electric crystal; The drain electrode of said precharge membrane transistor or source electrode are connected with said common line; Last sweep trace of the sweep trace that the grid of said precharge membrane transistor is connected with said pixel thin film electric crystal connects.
The utility model is owing to gate-controlled switch of parallel connection at the storage capacitors two ends; Can be before the conducting of pixel thin film electric crystal; Earlier pixel electrode is charged to the common line current potential between the positive-negative polarity current potential, like this when the conducting of pixel thin film electric crystal, can be directly on the basis of common line current potential benefit be charged to predetermined potential and get final product; Reduce sweep time, promoted the charge rate of pixel electrode.And during the conducting of pixel thin film electric crystal; Pressure reduction between its source electrode and the drain electrode is the pressure reduction of current data line with common line; Compare the pressure reduction of existing data lines and its counter electrode; In the utility model during the conducting of pixel thin film electric crystal the pressure reduction between source electrode and the drain electrode obviously reduce, reduced the risk of pixel thin film electric crystal high-voltage breakdown, promoted the life-span of pixel thin film electric crystal.
Description of drawings
Fig. 1 is the equivalent driving circuit figure of the existing single picture element of membrane transistor (TFT) LCD (LCD);
Fig. 2 is the corresponding waveform synoptic diagram of Fig. 1;
Fig. 3 is the LCD drive circuits synoptic diagram of the utility model;
Fig. 4 is the waveform synoptic diagram of the LCD drive circuits of the utility model.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the utility model is described further.
A kind of liquid crystal indicator; Comprise the liquid crystal panel module; The liquid crystal panel module includes liquid crystal panel and driving circuit, and this driving circuit comprises sweep trace, data line, common line, public electrode and pixel thin film electric crystal T1, and the source electrode of said pixel thin film electric crystal T1 connects with said data line; Its grid connects with said sweep trace, and its drain electrode is connected with liquid crystal capacitance C with between the said public electrode
LC, its drain electrode is connected with MM CAP C with between the said common line
STAlso be connected with between the drain electrode of said pixel thin film electric crystal T1 and the said common line with said MM CAP C
STThe gate-controlled switch of parallel connection.
As shown in Figure 3, said gate-controlled switch comprises precharge membrane transistor T2, and the source electrode of said precharge membrane transistor T2 or drain electrode are connected with the drain electrode of said pixel thin film electric crystal T1; The drain electrode of said precharge membrane transistor T2 or source electrode are connected with said common line; Last sweep trace of the sweep trace that the grid of said precharge membrane transistor T2 is connected with said pixel thin film electric crystal T1 connects.This is a kind of concrete gate-controlled switch form, adopts membrane transistor as gate-controlled switch, can when making pixel thin film electric crystal T1, form synchronously, does not increase extra production process, helps promoting throughput rate, reduces cost.
Certainly, gate-controlled switch can also adopt other controlled switches such as MOSFET, triode; The control end of gate-controlled switch also is not limited to and is connected to said last sweep trace; As long as before pixel thin film electric crystal T1 conducting, can control the gate-controlled switch conducting, when pixel thin film electric crystal T1 conducting; Can control the embodiment that gate-controlled switch ends, all in the protection domain of the utility model.
The driving method of above-mentioned liquid crystal indicator, be included in drive pixel thin film electric crystal T1 before, through gate-controlled switch with MM CAP C
STTwo terminal shortcircuits make the drain potential of pixel thin film electric crystal T1 follow the current potential of common line to be consistent.
Said gate-controlled switch is in the previous sweep spacing conducting of said pixel thin film electric crystal T1 conducting, and ends when lasting till pixel thin film electric crystal T1 conducting.In order to guarantee the display quality of present frame picture, the electric weight of storage capacitors need be maintained to the next scan period, therefore; Reducing the required duration of charging of picture element, promoting under the prerequisite of charge rate; Ensure image quality as much as possible, carry previous sweep spacing conducting gate-controlled switch, liquid crystal capacitance C
LCIt is proper carrying out precharge.
In this embodiment; The equivalent circuit diagram (like Fig. 1) of traditional picture element is added an extra membrane transistor (precharge membrane transistor T2), and the grid of this electric crystal (gate) is connected to corresponding last the sweep trace G (n-1) as bar sweep trace G (n) of current pixel electrode; And source (source) utmost point and drain electrode (drain) are connected to the common line (com) and pixel electrode (pixel) of array base palte respectively.Fig. 4 is its corresponding drive waveforms; When picture element electric capacity is desired negative potential by former frame and is charged to the positive potential of next frame; In the time that last sweep trace G (n-1) opens; Pixel electrode promptly can charge to the common line current potential (Com current potential) between the positive-negative polarity current potential earlier, so can shorten follow-up when needed opening time of bar sweep trace G (n) and raising charge rate.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.
Claims (7)
1. LCD drive circuits; Comprise sweep trace, data line, common line and pixel thin film electric crystal; The source electrode of said pixel thin film electric crystal connects with said data line; Its grid connects with said sweep trace, it is characterized in that, is connected with gate-controlled switch between the drain electrode of said pixel thin film electric crystal and the said common line.
2. a kind of LCD drive circuits as claimed in claim 1 is characterized in that, last sweep trace of the sweep trace that the control end of said gate-controlled switch is connected with said pixel thin film electric crystal connects.
3. a kind of LCD drive circuits as claimed in claim 1 is characterized in that said gate-controlled switch comprises the precharge membrane transistor, and the source electrode of said precharge membrane transistor or drain electrode are connected with the drain electrode of said pixel thin film electric crystal; The drain electrode of said precharge membrane transistor or source electrode are connected with said common line; Last sweep trace of the sweep trace that the grid of said precharge membrane transistor is connected with said pixel thin film electric crystal connects.
4. a liquid crystal panel module comprises like the arbitrary described a kind of LCD drive circuits of claim 1～3.
5. liquid crystal indicator; Comprise the liquid crystal panel module, described liquid crystal panel module comprises driving circuit, and described driving circuit comprises sweep trace, data line, common line and pixel thin film electric crystal; The source electrode of said pixel thin film electric crystal connects with said data line; Its grid connects with said sweep trace, it is characterized in that, is connected with gate-controlled switch between the drain electrode of said pixel thin film electric crystal and the said common line.
6. a kind of liquid crystal indicator as claimed in claim 5 is characterized in that, last sweep trace of the sweep trace that the control end of said gate-controlled switch is connected with said pixel thin film electric crystal connects.
7. a kind of liquid crystal indicator as claimed in claim 5 is characterized in that said gate-controlled switch comprises the precharge membrane transistor, and the source electrode of said precharge membrane transistor or drain electrode are connected with the drain electrode of said pixel thin film electric crystal; The drain electrode of said precharge membrane transistor or source electrode are connected with said common line; Last sweep trace of the sweep trace that the grid of said precharge membrane transistor is connected with said pixel thin film electric crystal connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204966728U CN202332231U (en) | 2011-12-02 | 2011-12-02 | Driving circuit, liquid crystal panel module and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204966728U CN202332231U (en) | 2011-12-02 | 2011-12-02 | Driving circuit, liquid crystal panel module and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202332231U true CN202332231U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204966728U Expired - Lifetime CN202332231U (en) | 2011-12-02 | 2011-12-02 | Driving circuit, liquid crystal panel module and liquid crystal display device |
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| Country | Link |
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| CN (1) | CN202332231U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402960A (en) * | 2011-12-02 | 2012-04-04 | 深圳市华星光电技术有限公司 | Drive circuit, liquid crystal panel module, liquid crystal display device and drive method |
| CN103676385A (en) * | 2013-12-27 | 2014-03-26 | 深圳市华星光电技术有限公司 | Pixel structure |
| CN110244481A (en) * | 2019-08-01 | 2019-09-17 | 京东方科技集团股份有限公司 | A kind of array substrate, liquid crystal display device and driving method |
-
2011
- 2011-12-02 CN CN2011204966728U patent/CN202332231U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402960A (en) * | 2011-12-02 | 2012-04-04 | 深圳市华星光电技术有限公司 | Drive circuit, liquid crystal panel module, liquid crystal display device and drive method |
| CN103676385A (en) * | 2013-12-27 | 2014-03-26 | 深圳市华星光电技术有限公司 | Pixel structure |
| CN110244481A (en) * | 2019-08-01 | 2019-09-17 | 京东方科技集团股份有限公司 | A kind of array substrate, liquid crystal display device and driving method |
| CN110244481B (en) * | 2019-08-01 | 2023-01-31 | 京东方科技集团股份有限公司 | Array substrate, liquid crystal display device and driving method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |