CN1945682A - Control device for quick clearing liquid crystal display panel ghost - Google Patents
Control device for quick clearing liquid crystal display panel ghost Download PDFInfo
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- CN1945682A CN1945682A CN 200610117707 CN200610117707A CN1945682A CN 1945682 A CN1945682 A CN 1945682A CN 200610117707 CN200610117707 CN 200610117707 CN 200610117707 A CN200610117707 A CN 200610117707A CN 1945682 A CN1945682 A CN 1945682A
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- crystal display
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Abstract
This invention discloses a control device for eliminating residual images of LED display panels including more than one control units with three end points, one of which is connected with a source output signal line and a liquid crystal panel data line, the other two are connected with a turn-off control signal line and an earth line of a PCB to deliver the turn-off signal to the control unit via said control signal line, said control unit can be the MOS transistor or BJT transistor, which can quickly discharge charges on the display panel to eliminated residual images on the panel.
Description
Technical field
The present invention relates to a kind of device that is used to eliminate liquid crystal display panel ghost, particularly a kind of control device of quick elimination liquid crystal display panel ghost.
Background technology
Be illustrated in figure 1 as the circuit theory diagrams of the device of existing elimination liquid crystal display panel ghost, it utilizes the XON function of grid-driving integrated circuit (Gate Driver IC), the detecting voltage U 3 of for example saying reseting circuit (Reset IC) is 2.4V, works as it in the moment of shutdown and detects supply voltage V
CCDrop to when being lower than 2.4V, through the 1 output earth potential XONR of resetting pin behind the delay time T, XON function in the grid-driving integrated circuit is activated at this moment, film crystal tube grid (TFTGate) on all panels is opened, the inner data line neutralization of positive and negative charge by linking to each other with source drive integrated circult (SourceIC) of every row in the panel, the electric charge of panel the inside be can't see ghost with regard to very fast disappearance like this.
So-called XON function is meant that after the XON pin (XONpin) of grid-driving integrated circuit was received opening signal, grid-driving integrated circuit was exported high level V
GON, open all film crystal tube grids of panel.Wherein open the critical voltage Vg of panel film crystal tube grid fully.Work as V
GONDuring 〉=Vg, the film crystal tube grid is opened fully, otherwise can partially open or close.Therefore the delay time T when shutdown is by the size decision of capacitor C 79.The voltage of opening panel film crystal tube grid is the outside thin film transistor (TFT) driving voltage V that supplies with
GON
But owing to voltage V when shutting down
GONDescend too soon, it is too short that the film crystal tube grid is opened the time, and electric charge does not have enough time to neutralize; Perhaps some positive charge that lists is too many or negative charge is too many, and electric charge does not neutralize fully; Perhaps the source drive integrated circult is a current potential at random in when shutdown output, also still has ghost and rests on the display panels.
Summary of the invention
The object of the present invention is to provide a kind of control device of quick elimination liquid crystal display panel ghost, its fast bleed off fall the electric charge on the display panels and eliminate ghost on the panel fast.
The objective of the invention is to be achieved through the following technical solutions:
A kind of control device of quick elimination liquid crystal display panel ghost, it comprises more than one control module, three end points are arranged on this control module, one of them end points connects a source output signal line and a liquid crystal panel data line, two other end points connects a shutdown control signal wire and a printed circuit board ground line respectively, and this control signal wire off signal is sent in this control module.
Wherein, this control signal is the signal of voltage, electric current, frequency or frequency range.
Wherein, this control module is a MOS transistor, and its three end points are respectively drain electrode, source electrode and the drain electrode of MOS transistor, and the drain electrode of this MOS transistor connects this source output signal line and this liquid crystal panel data line, grid connects this shutdown control signal wire, and source electrode connects this printed circuit board ground line.
Wherein, this control module is a BJT transistor (bipolar transistor), its three end points are respectively the transistorized emitter of this BJT, base stage and collector, the transistorized emitter of this BJT connects this source output signal line and this liquid crystal panel data line, base stage connects this shutdown control signal wire, and collector connects this printed circuit board ground line.
Wherein, between source drive integrated circult and PCB earth terminal, be provided with a current-limiting resistance.
Wherein, this control module is arranged at the inside of display panels source drive integrated circult.
Wherein, this control module is arranged at the outside of display panels source drive integrated circult.
Positive progressive effect of the present invention is:
Because when shutdown, the output terminal of source drive integrated circult is pulled to earth potential, remaining electric charge was bled off by moment in the panel, so power-off ghost shadow can disappear in the time that human eye can't be perceived, and can restrain source drive integrated circult output random signal simultaneously.
Description of drawings
Fig. 1 is the circuit theory diagrams of existing elimination liquid crystal display panel ghost device.
Fig. 2 is the control device synoptic diagram of quick elimination liquid crystal display panel ghost of the present invention.
Fig. 3 is the electrical schematic diagram of the embodiment of the invention one, and wherein Fig. 3 a uses nmos pass transistor as control module, and Fig. 3 b uses the PMOS transistor as control module.
Fig. 4 is the electrical schematic diagram of the embodiment of the invention two, and wherein Fig. 4 a uses NPN BJT transistor as control module, and Fig. 4 b uses PNP BJT transistor as control module.
Embodiment
Provide embodiments of the invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The device of a kind of quick elimination liquid crystal display panel ghost as shown in Figure 2, it comprises more than one control module 5, three end points are arranged on this control module on this control module 5, one of them end points connects a source output signal line 2 that links to each other with the source drive integrated circult and a liquid crystal panel data line 3 that links to each other with liquid crystal panel, and two other end points connects a shutdown control signal wire 4 and a printed circuit board ground line 6 respectively.
Wherein this control module 5 can be installed in the inside or the outside of source drive integrated circult.
And can between source drive integrated circult and PCB earth terminal, connect current-limiting resistance 7, during the ability to bear of the element of being flowed through greater than this electric current with the electric current that prevents from when being communicated with between source output signal line and the pcb board ground, to produce, burn out the element in the circuit.
This control module 5 can use simultaneously with the XON function of grid-driving integrated circuit, so that discharge is rapider.
Embodiment one
As shown in Figure 3, in the present embodiment, this control module 5 is a MOS transistor, and Fig. 3 a is nmos pass transistor M1, and Fig. 3 b is PMOS transistor M2.Its three end points are respectively drain electrode, source electrode and the drain electrode of MOS transistor, and wherein the drain electrode of this MOS transistor connects source output signal line 2 and liquid crystal panel data line 3, and grid connects shutdown control signal wire 4, and source electrode connects printed circuit board ground line 6.
When shutdown, control signal allows metal-oxide-semiconductor open by shutdown control signal wire 4, source output signal line 2 is pulled to earth potential, thereby the electric charge on the display panels is directly fallen by bleed off by liquid crystal panel data line 3, thereby prevents the generation of ghost on the display panels; During operate as normal, this metal-oxide-semiconductor is in the high resistant off state.
Embodiment two
As shown in Figure 4, in the present embodiment, this control module 5 is a BJT transistor, and Fig. 4 a is NPN BJT transistor Q1, and Fig. 2 b is PNP BJT transistor Q2.Its three end points are respectively the transistorized emitter of this BJT, base stage and collector, wherein the transistorized emitter of this BJT connects source output signal line 2 and liquid crystal panel data line 3, base stage connects shutdown control signal wire 4, collector connects printed circuit board ground line 6, and between transistorized emitter of this BJT and base stage, be provided with resistance 8, shutdown control signal wire 4 is provided with resistance 9 (resistance 8 and resistance 9 acceleration switch speed), and the structure of remainder is all identical with embodiment one with using method.
Claims (7)
1, a kind of control device of quick elimination liquid crystal display panel ghost, it is characterized by, it comprises more than one control module, three end points are arranged on this control module, one of them end points connects a source output signal line and a liquid crystal panel data line, two other end points connects a shutdown control signal wire and a printed circuit board ground line respectively, and is sent in this control module by this control signal wire off signal.
2, the control device of quick elimination liquid crystal display panel ghost according to claim 1 is characterized by, and this control signal is the signal of voltage, electric current, frequency or frequency range.
3, the control device of quick elimination liquid crystal display panel ghost according to claim 1, it is characterized by, this control module is a MOS transistor, its three end points are respectively grid, source electrode and the drain electrode of MOS transistor, the drain electrode of this MOS transistor connects this source output signal line and this liquid crystal panel data line, grid connects this shutdown control signal wire, and source electrode connects this printed circuit board ground line.
4, the control device of quick elimination liquid crystal display panel ghost according to claim 1, it is characterized by, this control module is a BJT transistor, its three end points are respectively the transistorized emitter of this BJT, base stage and collector, the transistorized emitter of this BJT connects this source output signal line and this liquid crystal panel data line, base stage connects this shutdown control signal wire, and collector connects this printed circuit board ground line.
5, the control device of quick elimination liquid crystal display panel ghost according to claim 1 is characterized in that, is provided with a current-limiting resistance between source drive integrated circult and PCB earth terminal.
6, according to the control device of any one described quick elimination liquid crystal display panel ghost in the claim 1 to 5, it is characterized by, this control module is arranged at the inside of the source drive integrated circult of display panels.
7, according to the control device of any one described quick elimination liquid crystal display panel ghost in the claim 1 to 5, it is characterized by, this control module is arranged at the outside of the source drive integrated circult of display panels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610117707A CN100583223C (en) | 2006-10-27 | 2006-10-27 | Control device for quick clearing liquid crystal display panel ghost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610117707A CN100583223C (en) | 2006-10-27 | 2006-10-27 | Control device for quick clearing liquid crystal display panel ghost |
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| Publication Number | Publication Date |
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| CN1945682A true CN1945682A (en) | 2007-04-11 |
| CN100583223C CN100583223C (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610117707A Active CN100583223C (en) | 2006-10-27 | 2006-10-27 | Control device for quick clearing liquid crystal display panel ghost |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522063A (en) * | 2011-12-05 | 2012-06-27 | 杭州士兰控股有限公司 | LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost |
| CN101364390B (en) * | 2007-08-10 | 2012-07-04 | 奇美电子股份有限公司 | Planar display |
| CN103412427A (en) * | 2013-08-13 | 2013-11-27 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display panel |
| CN103869516A (en) * | 2014-03-12 | 2014-06-18 | 京东方科技集团股份有限公司 | Display panel discharge circuit and display device |
| WO2014173019A1 (en) * | 2013-04-25 | 2014-10-30 | 京东方科技集团股份有限公司 | Ghost image removal circuit and display device |
| CN105206230A (en) * | 2015-10-09 | 2015-12-30 | 武汉华星光电技术有限公司 | Liquid crystal display backlight control circuit and terminal device |
| CN108766385A (en) * | 2018-08-29 | 2018-11-06 | 广东长虹电子有限公司 | A kind of shadow circuit that disappears of screen TCON plates |
| CN109509451A (en) * | 2018-12-21 | 2019-03-22 | 惠科股份有限公司 | Display device |
| CN112051783A (en) * | 2020-09-22 | 2020-12-08 | 禹创半导体(深圳)有限公司 | A forced pull-to-ground for data output in a power-free mode |
| CN112967692A (en) * | 2021-02-26 | 2021-06-15 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
| CN114283757A (en) * | 2021-12-29 | 2022-04-05 | 绵阳惠科光电科技有限公司 | Drive circuit and display device |
-
2006
- 2006-10-27 CN CN200610117707A patent/CN100583223C/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101364390B (en) * | 2007-08-10 | 2012-07-04 | 奇美电子股份有限公司 | Planar display |
| CN102522063A (en) * | 2011-12-05 | 2012-06-27 | 杭州士兰控股有限公司 | LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost |
| WO2014173019A1 (en) * | 2013-04-25 | 2014-10-30 | 京东方科技集团股份有限公司 | Ghost image removal circuit and display device |
| CN103412427B (en) * | 2013-08-13 | 2016-03-16 | 南京中电熊猫液晶显示科技有限公司 | A kind of display panels |
| CN103412427A (en) * | 2013-08-13 | 2013-11-27 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display panel |
| CN103869516A (en) * | 2014-03-12 | 2014-06-18 | 京东方科技集团股份有限公司 | Display panel discharge circuit and display device |
| CN103869516B (en) * | 2014-03-12 | 2016-04-06 | 京东方科技集团股份有限公司 | display panel discharge circuit and display device |
| US9704445B2 (en) | 2014-03-12 | 2017-07-11 | Boe Technology Group Co., Ltd. | Time-delayed discharge circuits for display panels and display devices |
| CN105206230A (en) * | 2015-10-09 | 2015-12-30 | 武汉华星光电技术有限公司 | Liquid crystal display backlight control circuit and terminal device |
| CN108766385A (en) * | 2018-08-29 | 2018-11-06 | 广东长虹电子有限公司 | A kind of shadow circuit that disappears of screen TCON plates |
| CN109509451A (en) * | 2018-12-21 | 2019-03-22 | 惠科股份有限公司 | Display device |
| CN112051783A (en) * | 2020-09-22 | 2020-12-08 | 禹创半导体(深圳)有限公司 | A forced pull-to-ground for data output in a power-free mode |
| CN112967692A (en) * | 2021-02-26 | 2021-06-15 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
| CN114283757A (en) * | 2021-12-29 | 2022-04-05 | 绵阳惠科光电科技有限公司 | Drive circuit and display device |
| CN114283757B (en) * | 2021-12-29 | 2023-08-25 | 绵阳惠科光电科技有限公司 | Driving circuit and display device |
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| Publication number | Publication date |
|---|---|
| CN100583223C (en) | 2010-01-20 |
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Owner name: SHANGHAI ZHONGHANG OPTOELECTRONICS CO., LTD. Free format text: FORMER OWNER: SHANGHAI SVA NEC LIQUID CRYSTAL DISPLAY CO., LTD. Effective date: 20100325 |
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Free format text: CORRECT: ADDRESS; FROM: 201108 NO.3388, HUANING ROAD, MINHANG DISTRICT, SHANGHAI CITY TO: 201108 NO.3388, HUANING ROAD, SHANGHAI CITY |
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Effective date of registration: 20100325 Address after: 201108 Shanghai City Huaning Road No. 3388 Patentee after: Shanghai AVIC Optoelectronics Co., Ltd. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3388 Patentee before: Shanghai SVA-NEC Liquid Crystal Display Co. Ltd. |
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Owner name: WUHAN TIANMA MICROELECRONICS CO., LTD. Free format text: FORMER OWNER: SHANGHAI AVIC OPTOELECTRONICS CO., LTD. Effective date: 20100831 |
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Free format text: CORRECT: ADDRESS; FROM: 201108 NO.3388, HUANING ROAD, SHANGHAI TO: 430074 NO.8, LIUFANGYUAN ROAD, DONGYI INDUSTRIAL PARK, DONGHU NEW TECH. DEVELOPMENT DISTRICT, WUHAN CITY |
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Effective date of registration: 20100831 Address after: 430074 Wuhan Road East Industrial Park Liufang East Lake New Technology Development Zone No. 8 Patentee after: Wuhan Tianma Micro-electronics Co., Ltd. Address before: 201108 Shanghai City Huaning Road No. 3388 Patentee before: Shanghai AVIC Optoelectronics Co., Ltd. |