CN101000753A - Data transmission circuit and liquid crystal display with static protection - Google Patents
Data transmission circuit and liquid crystal display with static protection Download PDFInfo
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- CN101000753A CN101000753A CN 200710003868 CN200710003868A CN101000753A CN 101000753 A CN101000753 A CN 101000753A CN 200710003868 CN200710003868 CN 200710003868 CN 200710003868 A CN200710003868 A CN 200710003868A CN 101000753 A CN101000753 A CN 101000753A
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Abstract
A data transmission circuit with electrostatic protection is prepared as coupling the first set of electrostatic protection element with the first set of data line, coupling the second set of electrostatic protection element with the second set of data line, coupling the first discharging path with the first set of electrostatic protection element and coupling the second discharging path with the second set of electrostatic protection element.
Description
[technical field]
The invention relates to a kind of data transmission circuit of tool antistatic capacity, or rather, the present invention is relevant for a kind of LCD of data transmission circuit of tool antistatic capacity.
[background technology]
Please refer to Fig. 1.Fig. 1 is illustrated as the synoptic diagram of the LCD 100 of prior art.LCD 100 comprises data transmission circuit 110 and pixel-driving circuit 120.Pixel-driving circuit 120 comprises sweep trace G0, G1, G2 ... Gm, wherein sweep trace G0 ~ Gm gives pairing pixel in order to transmit pixel drive signal.Data transmission circuit 110 comprises data line D0, D1, D2...Dn, electrostatic protection element E0, E1, E2...En, and discharge path P1.In data transmission circuit 110, data line D0 ~ Dn gives pairing pixel in order to transmit image data; Electrostatic protection element E0 ~ En one end all is respectively coupled to corresponding data lines D0 ~ Dn; the other end then jointly is coupled to discharge path P1; be not subjected to the influence of electrostatic discharge event in order to protected data line D0 ~ Dn; and static discharge current is directed to discharge path P1, so that static discharge current is dissipated.
Please refer to Fig. 2.Fig. 2 is the synoptic diagram of explanation data line D0 and D1.Data transmission circuit 110 can be on different data lines when the transmission data, and the voltage with respect to common voltage Vcom opposed polarity transmits data.For instance, data transmission circuit 110 is on even number bar data line D0-, D2, D4...Dn-1, all being that positive voltage transmits data with respect to common voltage Vcom, and on odd number bar data line D1, D3, D5...Dn, all to transmit data with respect to common voltage Vcom for negative voltage.As shown in Figure 2, the pairing voltage of data line data that D0 transmits just is all, and the pairing voltage of data line D1 is all negative.Therefore, the scope of the pairing voltage of tentation data is 0 ~ 5 volt, and then data line D0 and D1 go up contained voltage maximum and can arrive 10 volts, shown in the voltage difference Vx1 among Fig. 2.
More than explanation is the situation that data line transmits signal, though only illustrate that data transmission circuit 110 is at even number bar data line D0-, D2, on the D4...Dn-1, all being that positive voltage transmits data with respect to common voltage Vcom, and at odd number bar data line D1, D3, on the D5...Dn, all to transmit data for negative voltage with respect to common voltage Vcom, yet actual situation, also might be that even number bar data line all transmits data with relative common voltage Vcom for negative voltage, and at odd number bar data line D1, D3, on the D5...Dn, all being that positive voltage transmits data with respect to common voltage Vcom.Or section is that even number bar data line all transmits data with relative common voltage Vcom for negative voltage at a time, and on odd number bar data line D1, D3, D5...Dn, all being that positive voltage transmits data with respect to common voltage Vcom, in the other period is that even number bar data line is that positive voltage transmits data with relative common voltage Vcom all, and on odd number bar data line D1, D3, D5...Dn, all to transmit data with respect to common voltage Vcom for negative voltage.Therefore, the voltage on data line D0 might just sometimes be just, sometimes is negative.Please refer to Fig. 3.Fig. 3 is the synoptic diagram of explanation data line D0 and D1.Data transmission circuit 110 is in transmission during data, the voltage that on data line D0 and D1, is carried, in a certain period with respect to common voltage Vcom for just, a certain period is to bear with respect to common voltage Vcom.As shown in Figure 3, the voltage that dotted portion representative data line D0 is transmitted, the voltage that solid line part representative data line D1 is transmitted.Therefore, the scope of the pairing voltage of tentation data is 0 ~ 5 volt, and then data line D0 and D1 go up contained voltage maximum and can arrive 10 volts, shown in the voltage difference Vx2 among Fig. 3.
Mode about driving voltage on the data line is too numerous to enumerate, and the present invention is only in this measure numerical example, and purpose is to illustrate that on data line because staggered mode drives, voltage might the excessive situation of difference between the data line and produce.
Please refer to Fig. 4.Fig. 4 is for illustrating that electric current flow to the synoptic diagram of D1 from data line D0 when voltage contained on data line D0 and the D1 is variant.Because the electrostatic protection element that actual fabrication is come out not is an ideal element, when there is voltage differences at the protective element two ends, still having leakage current takes place, this leakage current can increase and increase along with voltage difference, therefore being 5 volts with the pairing voltage range of data equally is example, if all data lines all transmit data with the voltage of identical polarity, the voltage differences of then wantonly two data lines at most only is 5 volts; If but data line transmission manner, be to transmit in the mode of Fig. 2 or Fig. 3, then as shown in Figure 4, voltage difference at data line D0 and data line D1 can surpass 5 volts (can find out among Fig. 2 and Fig. 3 that maximum difference is 10 volts), even without electrostatic discharge event takes place, electrostatic protection element E0 still has leakage current and takes place, cause electric current I from data line D0 via electrostatic protection element E0, discharge path P1, flow to data line D1.Thus, the voltage quasi position of data line D0 and data line D1 will be affected, and causes the voltage that sends pixel to produce error, influences the demonstration of picture.
[summary of the invention]
The invention provides a kind of data transmission circuit, comprise one first group of data line, be used for receiving and transmitting one first kind of data with electrostatic discharge protective; One second group of data line is used for receiving and transmitting one second kind of data; One first group of electrostatic protection element, each electrostatic protection element of this first group of electrostatic protection element are coupled to a corresponding data line of this first group of data line; One second group of electrostatic protection element, each electrostatic protection element of this second group of electrostatic protection element are coupled to a corresponding data line of this second group of data line; One first discharge path is coupled to each electrostatic protection element of this first group of electrostatic protection element; Reach one second discharge path, be coupled to each electrostatic protection element of this second group of electrostatic protection element.
The present invention provides a kind of LCD with data transmission circuit of electrostatic discharge protective in addition, comprises one first glass substrate, comprises a pixel-driving circuit, comprises the multi-strip scanning line, in order to transmit a plurality of drive signals; One data transmission circuit comprises one first group of data line, is used for receiving and transmitting one first kind of data; One second group of data line is used for receiving and transmitting one second kind of data; One first group of electrostatic protection element, each electrostatic protection element of this first group of electrostatic protection element are coupled to a corresponding data line of this first group of data line; One second group of electrostatic protection element, each electrostatic protection element of this second group of electrostatic protection element are coupled to a corresponding data line of this second group of data line; One first discharge path is coupled to each electrostatic protection element of this first group of electrostatic protection element; Reach one second discharge path, be coupled to each electrostatic protection element of this second group of electrostatic protection element; First pixel region more than one, wherein each first pixel region is coupled to the corresponding data line of this pixel-driving circuit and this first group of data line, in order to the corresponding drive signal that receives these a plurality of drive signals corresponding data with these first kind of data; And more than one second pixel regions, wherein each second pixel region is coupled to the corresponding data line of this pixel-driving circuit and this second group of data line, in order to the corresponding drive signal that receives these a plurality of drive signals corresponding data with these second kind of data; One second glass substrate; And a liquid crystal layer, place between this first glass substrate and this second glass substrate.
[description of drawings]
Fig. 1 is illustrated as the synoptic diagram of the LCD of prior art.
Fig. 2 is the synoptic diagram of explanation data line D0 and D1.
Fig. 3 is the synoptic diagram of explanation data line D0 and D1.
Fig. 4 for explanation when voltage differences contained on data line D0 and the D1 during greater than a predetermined value electric current flow to the synoptic diagram of D1 from data line D0.
Fig. 5 is the synoptic diagram of data transmission circuit of the present invention.
Fig. 6 is the synoptic diagram of first embodiment of electrostatic protection element of the present invention.
Fig. 7 is the synoptic diagram of second embodiment of electrostatic protection element of the present invention.
Fig. 8 is the synoptic diagram of the 3rd embodiment of electrostatic protection element of the present invention.
Fig. 9 is the synoptic diagram of the 4th embodiment of electrostatic protection element of the present invention.
Figure 10 is the LCD of the data transmission circuit of tool electrostatic discharge protective of the present invention.
[embodiment]
Please refer to Fig. 5.Fig. 5 is the synoptic diagram of data transmission circuit 500 of the present invention.As shown in the figure, data transmission circuit 500 comprises data line D0, D1, D2...Dn, electrostatic protection element E0, E1, E2...En, and discharge path P2 and P3.The tentation data transmission manner is all positive voltage at even number bar data line D0, D2, D4...Dn, be all negative voltage at odd number bar data line D1, D3, D5...Dn-1, and the pairing voltage range of data also is 5 volts.Data transmission circuit 500 of the present invention promptly according to the characteristic of transmission voltage on the data line, is divided into two groups and be coupled to corresponding data lines and discharge path with electrostatic protection element E0 ~ En.As shown in the figure, even number electrostatic protection element E0-, E2, E4...En one end are coupled to corresponding data lines D0, D2, D4...Dn, and the other end then jointly is coupled to discharge path P2; Odd number electrostatic protection element E1, E3, E5...En-1 one end are coupled to corresponding data lines D1, D3, D5...Dn-1, and the other end then jointly is coupled to discharge path P3.Thus, because even number bar data line D0, D2, D4...Dn are all positive voltage and scope all in 5 volts, therefore, across the voltage difference of electrostatic protection element E0, E2, E4...En, maximum also only is 5 volts, and the situation that can not surpass 5 volts just like the cross-pressure of prior art is produced dirt.On the other hand, because odd number bar data line D1, D3, D5...Dn-1 are all negative voltage and scope all in 5 volts, therefore, across the voltage difference of electrostatic protection element E1, E3, E5...En-1, maximum also only is 5 volts, and the situation that also can not surpass 5 volts just like the cross-pressure of prior art produces.Therefore, data transmission circuit 500 of the present invention can be avoided because voltage difference produces electric current flow to another data line from a data line via electrostatic protection element situation too greatly.
In addition, among Fig. 5, it only is an example that data transmission circuit 500 of the present invention is divided into two groups with the electrostatic defending two element.Spirit of the present invention according to the difference of the characteristic of voltage on the data line, and is classified for pairing electrostatic protection element and discharge path, so that same group electrostatic protection element can not produce the situation of conducting because of the voltage differences on the data line.Therefore, when actual design, still can electrostatic protection element and discharge path be divided into more than two groups, to avoid when non-electrostatic discharge event takes place, producing the situation of conducting with regard to the voltage characteristic of data line.
Please refer to Fig. 6.Fig. 6 is the synoptic diagram of first embodiment of electrostatic protection element En of the present invention.As shown in the figure, electrostatic protection element En comprises two diode Da and Db.Diode Da and diode Db differential concatenation.
Please refer to Fig. 7.Fig. 7 is the synoptic diagram of second embodiment of electrostatic protection element En of the present invention.As shown in the figure, electrostatic protection element En comprises four diode Dc, Dd, De, Df.Diode Dc and diode Dd differential concatenation form a back to back diode.Diode De forms a back to back diode and in parallel with the back to back diode that diode Dd forms with diode Dc with diode Df differential concatenation.
Please refer to Fig. 8.Fig. 8 is the synoptic diagram of the 3rd embodiment of electrostatic protection element En of the present invention.As shown in the figure, electrostatic protection element En comprises two diode Dg and Dh.Diode Dg and diode Dh differential concatenation.
Please refer to Fig. 9.Fig. 9 is the synoptic diagram of the 4th embodiment of electrostatic protection element En of the present invention.As shown in the figure, electrostatic protection element En comprises two gold medal oxygen and partly leads transistor (MOS) Qa and Qb.Grid and one end that gold oxygen is partly led transistor Qa are coupled to data line jointly, and the other end is coupled to discharge path.Grid and one end that gold oxygen is partly led transistor Qb are coupled to discharge path jointly, and the other end is coupled to data line.
Please refer to Figure 10.Figure 10 is the LCD 1000 of the data transmission circuit of tool electrostatic discharge protective of the present invention.LCD 1000 comprises one first glass substrate 1100, a liquid crystal layer 1200 and one second glass substrate 1300.Liquid crystal layer 1200 and be formed at first glass substrate 1100 and second glass substrate 1300 between.First glass substrate 1100 comprises data transmission circuit 1110 and pixel-driving circuit 1120.The composition of data transmission circuit 1110 is equal to the data transmission circuit 500 of Fig. 5, pixel-driving circuit 1120 is equal to the pixel-driving circuit 120 among Fig. 1, the data line D0-Dn of data transmission circuit 1110 is also staggered and form a plurality of pixel A 00, A01, A02...Anm-1 etc. with the sweep trace of pixel-driving circuit 1120, and dependency structure repeats no more.Therefore, the LCD 1000 of the data transmission circuit of tool electrostatic discharge protective of the present invention, the electrostatic protection element conducting causes the situation of misoperation in the time of can avoiding the LCD of prior art to occur in non-electrostatic discharge event taking place, and promotes quality of display pictures.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (12)
1. data transmission circuit with electrostatic discharge protective comprises:
One first group of data line is used for receiving and transmitting one first kind of data;
One second group of data line is used for receiving and transmitting one second kind of data;
One first group of electrostatic protection element, each electrostatic protection element of this first group of electrostatic protection element be coupled to this
One corresponding data line of one group of data line;
One second group of electrostatic protection element, each electrostatic protection element of this second group of electrostatic protection element are coupled to a corresponding data line of this second group of data line;
One first discharge path is coupled to each electrostatic protection element of this first group of electrostatic protection element; And
One second discharge path is coupled to each electrostatic protection element of this second group of electrostatic protection element.
2. data transmission circuit according to claim 1 is characterized in that, this first kind of pairing voltage of data is positive polarity with respect to a predetermined value; This second kind of pairing voltage of data is negative polarity with respect to this predetermined value.
3. data transmission circuit according to claim 1 is characterized in that, this first kind of pairing voltage of data is negative polarity with respect to a predetermined value; This second kind of pairing voltage of data is positive polarity with respect to this predetermined value.
4. data transmission circuit according to claim 1 is characterized in that, this first kind of pairing voltage of data is positive polarity and is negative polarity in one second schedule time in one first schedule time with respect to a predetermined value;
This second kind of pairing voltage of data is negative polarity and is positive polarity in this second schedule time in this first schedule time with respect to this predetermined value.
5. data transmission circuit according to claim 1 is characterized in that, this first kind of relative predetermined value of the pairing voltage of data was negative polarity and is positive polarity in one second schedule time in one first schedule time; This second kind of pairing voltage of data is positive polarity and is negative polarity in this second schedule time in this first schedule time with respect to this predetermined value.
6. data transmission circuit according to claim 1, it is characterized in that the difference maximum of this first kind of pairing voltage of data and this second kind of pairing voltage of data can surpass this first kind of pairing voltage range of data or this second kind of pairing voltage range of data.
7. LCD with data transmission circuit of electrostatic discharge protective comprises:
One first glass substrate comprises:
One pixel-driving circuit comprises the multi-strip scanning line, in order to transmit a plurality of drive signals;
One data transmission circuit comprises:
One first group of data line is used for receiving and transmitting one first kind of data;
One second group of data line is used for receiving and transmitting one second kind of data;
One first group of electrostatic protection element, each electrostatic protection element of this first group of electrostatic protection element are coupled to a corresponding data line of this first group of data line;
One second group of electrostatic protection element, each electrostatic protection element of this second group of electrostatic protection element are coupled to a corresponding data line of this second group of data line;
One first discharge path is coupled to each electrostatic protection element of this first group of electrostatic protection element; Reach one second discharge path, be coupled to each electrostatic protection element of this second group of electrostatic protection element;
First pixel region more than one, wherein each first pixel region is coupled to this pixel-driving circuit and this first group
The corresponding data line of data line is in order to the corresponding drive signal that receives these a plurality of drive signals corresponding data with these first kind of data; And
Second pixel region more than one, wherein each second pixel region is coupled to the corresponding data line of this pixel-driving circuit and this second group of data line, in order to the corresponding drive signal that receives these a plurality of drive signals corresponding data with these second kind of data;
One second glass substrate; And
One liquid crystal layer places between this first glass substrate and this second glass substrate.
8. data transmission circuit according to claim 7 is characterized in that, this first kind of pairing voltage of data is positive polarity with respect to a predetermined value; This second kind of pairing voltage of data is negative polarity with respect to this predetermined value.
9. data transmission circuit according to claim 7 is characterized in that, this first kind of pairing voltage of data is negative polarity with respect to a predetermined value; This second kind of pairing voltage of data is positive polarity with respect to this predetermined value.
10. data transmission circuit according to claim 7 is characterized in that, this first kind of pairing voltage of data is positive polarity and is negative polarity in one second schedule time in one first schedule time with respect to a predetermined value;
This second kind of pairing voltage of data is negative polarity and is positive polarity in this second schedule time in this first schedule time with respect to this predetermined value.
11. data transmission circuit according to claim 7 is characterized in that, this first kind of relative predetermined value of the pairing voltage of data was negative polarity and is positive polarity in one second schedule time in one first schedule time; This second kind of pairing voltage of data is positive polarity and is negative polarity in this second schedule time in this first schedule time with respect to this predetermined value.
12. data transmission circuit according to claim 7, it is characterized in that the difference maximum of this first kind of pairing voltage of data and this second kind of pairing voltage of data can surpass this first kind of pairing voltage range of data or this second kind of pairing voltage range of data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710003868 CN101000753A (en) | 2007-01-10 | 2007-01-10 | Data transmission circuit and liquid crystal display with static protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710003868 CN101000753A (en) | 2007-01-10 | 2007-01-10 | Data transmission circuit and liquid crystal display with static protection |
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| Publication Number | Publication Date |
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| CN101000753A true CN101000753A (en) | 2007-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710003868 Pending CN101000753A (en) | 2007-01-10 | 2007-01-10 | Data transmission circuit and liquid crystal display with static protection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050951A (en) * | 2011-10-14 | 2013-04-17 | 和硕联合科技股份有限公司 | Electronic protection device |
| CN104517563A (en) * | 2013-10-01 | 2015-04-15 | 乐金显示有限公司 | Display device |
| WO2017041330A1 (en) * | 2015-09-08 | 2017-03-16 | 深圳市华星光电技术有限公司 | Liquid crystal display panel, driving circuit thereof and manufacturing method therefor |
| CN113497025A (en) * | 2020-04-03 | 2021-10-12 | 无锡华润微电子有限公司 | SOI grid grounding MOS device structure for electrostatic protection and manufacturing method thereof |
-
2007
- 2007-01-10 CN CN 200710003868 patent/CN101000753A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050951A (en) * | 2011-10-14 | 2013-04-17 | 和硕联合科技股份有限公司 | Electronic protection device |
| CN103050951B (en) * | 2011-10-14 | 2015-08-26 | 和硕联合科技股份有限公司 | Electronic protection device |
| CN104517563A (en) * | 2013-10-01 | 2015-04-15 | 乐金显示有限公司 | Display device |
| US9626901B2 (en) | 2013-10-01 | 2017-04-18 | Lg Display Co., Ltd. | Display device |
| CN104517563B (en) * | 2013-10-01 | 2017-11-17 | 乐金显示有限公司 | Display device |
| WO2017041330A1 (en) * | 2015-09-08 | 2017-03-16 | 深圳市华星光电技术有限公司 | Liquid crystal display panel, driving circuit thereof and manufacturing method therefor |
| US10203574B2 (en) | 2015-09-08 | 2019-02-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Liquid crystal display panel, driving circuit and manufacturing method of the same |
| CN113497025A (en) * | 2020-04-03 | 2021-10-12 | 无锡华润微电子有限公司 | SOI grid grounding MOS device structure for electrostatic protection and manufacturing method thereof |
| CN113497025B (en) * | 2020-04-03 | 2023-11-07 | 无锡华润微电子有限公司 | SOI grid grounding MOS device structure for electrostatic protection and manufacturing method thereof |
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