CN100430991C - Method for eliminating remnant shadow of display unit - Google Patents
Method for eliminating remnant shadow of display unit Download PDFInfo
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- CN100430991C CN100430991C CNB2005101328584A CN200510132858A CN100430991C CN 100430991 C CN100430991 C CN 100430991C CN B2005101328584 A CNB2005101328584 A CN B2005101328584A CN 200510132858 A CN200510132858 A CN 200510132858A CN 100430991 C CN100430991 C CN 100430991C
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- gate driver
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Abstract
The invention provides a grid drive circuit which can eliminate closedown remanant shadow, it suits the display device. It includes: the first capacitance, diode, the second capacitance and voltage stabilizing circuit. Thereinto, the first capacitance is use to filter the high-frequency dash wave and high-frequency noise of the input voltage, the diode is used to receive the input voltage and charge the second capacitance and provide input voltage for the voltage stabilizing circuit, then pass the transform of the voltage stabilizing circuit and transfer the output voltage to logic circuit in the display device.
Description
Technical field
The present invention relates to a kind of gate driver circuit, and be particularly related to a kind of gate drive apparatus of eliminating the display equipment power-off ghost shadow.
Background technology
Fig. 1 is the driving sequential chart of TFT LCD.Please refer to Fig. 1, traditional TFT LCD comprises display panel and backlight module, and the start step of TFT LCD inside is earlier at sequential t at present
N1Open the general supply (shown in curve A) of TFT LCD, comprise the common electrode that puts on the TFT LCD and the voltage on the pixel electrode.Then, at sequential t
N2Received image signal (shown in curve B) is to the dot structure of TFT LCD, afterwards again in sequential t
N3Open backlight module (shown in curve C), so that the display panel light source to be provided, and then make the TFT liquid crystal display displays picture of publishing picture.Please continue with reference to Fig. 1, the shutdown procedures of traditional TFT LCD inside is then opposite with its start step, and it is earlier at sequential t
F1Close backlight module, and the picture signal that inputs to dot structure is at sequential t
F2Finish fully, afterwards then at sequential t
F3Close the general supply of TFT LCD.
From the above, before after closing backlight module, finishing with picture signal, sequential t just
F1To t
F2During this period of time in (normally 16.7 milliseconds) because picture signal still is present in the dot structure, and remaining on the pixel electrode electric charge is arranged, and these remaining electric charges there is no effective discharge path, thus must be after after a while discharge off fully.Therefore, after the shutdown of TFT LCD, tend at sequential t
F3Ghost phenomena takes place afterwards.
Fig. 2 is known displays device gate driver circuit figure, and Fig. 3 is a known displays device logical drive power-off sequential chart.Please merge with reference to Fig. 2 and Fig. 3, when the display equipment electric power starting, Fig. 2 utilizes inductor 201 and the integrated mu balanced circuit 207 of capacitor 203,205 collocation, and the required driving power (VDD) of logical circuit on the display equipment is provided.And the logic state (VDD orVSS) that grid logical drive power supply (VGH, VGL) meeting is provided according to the display equipment logical circuit, pass through the voltage shift device (Levelshifter) of each channel circuit in the gate driver circuit (Gate driver) again, (VDD or VSS) converts grid logical drive power supply (VGH orVGL) to logic state, opens or close the thin film transistor (TFT) of display equipment interior pixel structure by this.
Then, when display equipment is closed (shown in Fig. 3 dotted line I), logical drive power supply (VDD) is consistent with the time that grid logical drive power supply (VGH, VGL) is closed, and cause display equipment after closing, gate driving power supply (VGH, VGL) still has remaining electric charge to remove to open or close the thin film transistor (TFT) of display equipment interior pixel structure, and then has the phenomenon of ghost to produce.
In order to address the above problem, known technology is at sequential t
F3Utilize microprocessor of three control IC collocation afterwards, come closing timing in order to the required driving power of logical circuit (VDD, VGH, VGL) on the control display equipment.By this, when display equipment is closed, will prolong the closing timing of logical drive power supply (VDD), the thin film transistor (TFT) of all dot structures in the display equipment is opened, and then make pixel electrode carry out rapid discharge to reach the elimination power-off ghost shadow.
Yet, because known method must be used three control IC and a microprocessor more, control required driving power (VDD, VGH, the VGL) closing timing of logical circuit on the display equipment, so in the consideration of manufacturing cost, also just comparatively improve.
Summary of the invention
In view of the foregoing, the present invention's purpose provides a kind of gate driver circuit of display equipment, comes the ghost that is produced when display equipment shuts down in order to eliminate.
The present invention does an input voltage conversion of voltage level earlier, offers the required driving power (VDD) of logical circuit in the display equipment again.Comprise at gate driver circuit of the present invention: first electric capacity, diode, second electric capacity and mu balanced circuit.Wherein, first electric capacity is in order to high frequency surging and high frequency noise filtering with input voltage, and diode is in order to receive this input voltage, through the forward conducting of diode second electric capacity is done charging and provided input voltage to mu balanced circuit again, last again via the voltage level conversion of mu balanced circuit, output voltage is delivered to logical circuit in the display equipment.
Just can when shutting down, display equipment prolong the required driving power (VDD) of logical circuit in the display equipment because of the present invention.Therefore, with technique known in relatively, will replace the uses of three control IC and microprocessor, can reduce the cost when making.
State with further feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the driving sequential chart of TFT LCD.
Fig. 2 is known displays device gate driver circuit figure.
Fig. 3 is a known displays device logical drive power-off sequential chart.
Fig. 4 is the Organization Chart of traditional gate driver circuit that is used for display equipment.
Fig. 5 is the gate driver circuit figure according to one of the present invention preferred embodiment.
Fig. 6 is the logical drive power-off sequential chart according to one of the present invention embodiment.
Fig. 7 is the logical drive power-off sequential chart according to another embodiment of the present invention.
The main element description of symbols
201: inductor
203,205: capacitor
207: integrated mu balanced circuit
401: demoder
402: the voltage shift device
403: output stage
500: gate driver circuit
501: the first electric capacity
503: diode
505: the second electric capacity
507: mu balanced circuit
S0～Sn: the control signal of offset buffer
G1～Gm: the gate line in the display device
I: display equipment closing timing
D1, D2: display equipment is closed the sequential of delaying of back logical drive power vd D
VIN: input voltage
VINP: input voltage (VIN-0.25V)
VSS: reference potential
VDD: logical drive power supply
VGH, VGL: grid logical drive power supply
t
N1, t
N2, t
N3, t
F1, t
F2, t
F3: sequential
Embodiment
Fig. 4 is used for the Organization Chart of the gate driver circuit of display equipment for tradition.Demoder 401 has a plurality of output terminals, and each output terminal all couples a voltage shift device and an output stage, so forms each channel circuit, finally be couple to again gate lines G 1～Gm in the display equipment in one of.
Then, Fig. 5 is the gate driver circuit figure according to one of the present invention preferred embodiment.Please refer to Fig. 5, comprise first electric capacity 501, diode 503, second electric capacity 505 and mu balanced circuit 507 at the present invention's gate driver circuit 500.Wherein, first electric capacity 501 is coupled between input voltage VIN and the reference potential VSS, this reference potential can be earthing potential, and the anode tap of diode 503 is in order to receive input voltage VIN, and cathode terminal then is couple to the positive terminal of second electric capacity 505 and the input end of mu balanced circuit 507 respectively.In addition, the earth terminal of the cathode terminal of second electric capacity 505 and the mu balanced circuit 507 reference potential VSS that is coupled to each other, change via the voltage level of mu balanced circuit 507 more at last, logical drive power vd D is offered logical circuit in the display equipment, and wherein mu balanced circuit 507 can be integrated mu balanced circuit.
In the present embodiment, first electric capacity, 501 meeting elder generations are with the high frequency surging and the high frequency noise filtering of input voltage VIN, this input voltage VIN can be+5V, provide stable input voltage VIN to cause forward conducting of diode 503 again, and the input end that provides input voltage VIN P (VIN-0.25V) to give mu balanced circuit 507 reaches 505 chargings of second electric capacity, via mu balanced circuit 507 input voltage VIN P (VIN-0.25V) is done the voltage level conversion again, at last at the logical circuit that provides logical drive power vd D in the display device, the logical drive power vd D output voltage that provided of a gate driver circuit for this reason wherein, this output voltage can be+3.3V.
Wherein, can be ceramic condenser or tantalum matter electric capacity at first electric capacity 501 of one of the present invention preferred embodiment, and capacitance can be 0.1uF.Diode 503 can be Schottky diode, and because of the forward forward voltage of Schottky diode lower than general diode, can be 0.25V at this, so when display equipment is closed, because of diode 503 both end voltage differences little (VIN-0.25V), so electric current is little toward the amount that refluxes through diode 505, utilizes second electric capacity 505 to come store charge again, the logical drive power vd D that mu balanced circuit 507 is exported delays a sequential.In the present invention, second electric capacity 505 can be electrolytic solution electric capacity.
At this, the capacitance size of second electric capacity 505 can determine display equipment to close the length that back logical drive power vd D sequential is delayed.When capacitance was big, the sequential D2 that logical drive power vd D delays was just long; And capacitance hour, and the sequential D1 that logical drive power vd D delays is just shorter.
Fig. 6 and Fig. 7 are a kind of logical drive power-off sequential chart according to second electric capacity of different capacitances, please merge with reference to Fig. 5, Fig. 6 and Fig. 7, when second electric capacity, the 505 selected capacitances of Fig. 5 are 330uF, logical drive power vd D is after display equipment is closed, can produce a sequential D1 who delays, and when second electric capacity 505 was 1000uF, logical drive power vd D can produce a sequential D2 who delays after display equipment is closed.Though second electric capacity of two kinds of capacitances more than is provided, the person of ordinary skill in the field is when knowing that the capacitance of second electric capacity does not influence the main spirit of the present invention.Therefore, the person of ordinary skill in the field can adjust the capacitance of second electric capacity according to the needs of reality.
In sum, the present invention provides a kind of gate driver circuit, and it is applicable to display device.Because the present invention utilizes the diode 503 and second electric capacity 505, when display equipment is closed, logical drive power vd D is prolonged a sequential, by this thin film transistor (TFT) of all dot structures in the display equipment is opened, and then make pixel electrode carry out rapid discharge to reach the elimination power-off ghost shadow, and with technique known in relatively, advantage of the present invention is not need three control IC and the microprocessors of using more, so also lower in the consideration of cost.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.
Claims (12)
1. the gate driver circuit that can eliminate ghost is characterized in that the suitable displays device, in order to input voltage is converted to output voltage, supplying with the required power supply of logical circuit, and delays the sequential of this power supply, and this gate driver circuit comprises:
First electric capacity is coupled between this input voltage and the reference potential;
Diode, its anode tap receives this input voltage;
Second electric capacity is coupled between the cathode terminal and this reference potential of this diode; And
Mu balanced circuit, this cathode terminal that couples this diode is to produce this output voltage to this logical circuit.
2. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this first electric capacity is ceramic condenser, in order to high frequency surging and the high frequency noise filtering with this input voltage.
3. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this first electric capacity is tantalum matter electric capacity, in order to high frequency surging and the high frequency noise filtering with this input voltage.
4. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this diode is a Schottky diode.
5. the gate driver circuit that can eliminate ghost according to claim 4, the forward forward voltage that it is characterized in that this Schottky diode is 0.25V.
6. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this second electric capacity is electrolytic solution electric capacity.
7. the gate driver circuit that can eliminate ghost according to claim 1, the capacitance that it is characterized in that this second electric capacity is 330uF.
8. the gate driver circuit that can eliminate ghost according to claim 1, the capacitance that it is characterized in that this second electric capacity is 1000uF.
9. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this mu balanced circuit is integrated mu balanced circuit.
10. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this input voltage is+5V.
11. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this output voltage is+3.3V.
12. the gate driver circuit that can eliminate ghost according to claim 1 is characterized in that this reference potential is an earthing potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101328584A CN100430991C (en) | 2005-12-27 | 2005-12-27 | Method for eliminating remnant shadow of display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101328584A CN100430991C (en) | 2005-12-27 | 2005-12-27 | Method for eliminating remnant shadow of display unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1991952A CN1991952A (en) | 2007-07-04 |
| CN100430991C true CN100430991C (en) | 2008-11-05 |
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|---|---|---|---|
| CNB2005101328584A Active CN100430991C (en) | 2005-12-27 | 2005-12-27 | Method for eliminating remnant shadow of display unit |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101739967B (en) * | 2008-11-12 | 2012-11-07 | 瀚宇彩晶股份有限公司 | Method for eliminating shut-down afterimage of display, control panel and display thereof |
| CN102522070B (en) * | 2011-12-24 | 2013-10-16 | 西安启芯微电子有限公司 | Control circuit for eliminating glittering and shutdown ghosting phenomena of thin film field effect transistor |
| EP2983166B8 (en) * | 2013-04-02 | 2022-02-23 | Beijing BOE Optoelectronics Technology Co., Ltd. | Method and apparatus for eliminating imperfect image, and display device |
| CN104680996B (en) * | 2015-03-10 | 2017-08-15 | 深圳市华星光电技术有限公司 | A kind of VCOM generative circuits and liquid crystal display |
| CN106847143B (en) * | 2017-03-03 | 2020-12-29 | 昆山龙腾光电股份有限公司 | Detection circuit and display device |
| CN108877710B (en) * | 2018-07-03 | 2020-12-08 | 京东方科技集团股份有限公司 | Grid on-state voltage providing unit and method, display driving module and display device |
| CN109410880B (en) * | 2018-12-20 | 2020-09-08 | 深圳市华星光电半导体显示技术有限公司 | Display panel driving circuit |
| CN110400531B (en) * | 2019-07-29 | 2022-08-23 | 昆山龙腾光电股份有限公司 | Neutralization circuit and display panel |
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| US5793346A (en) * | 1995-09-07 | 1998-08-11 | Samsung Electronics Co., Ltd. | Liquid crystal display devices having active screen clearing circuits therein |
| JP2003122311A (en) * | 2001-10-11 | 2003-04-25 | Matsushita Electric Ind Co Ltd | Electrical discharge method and device for image display panel, image display panel, and image display device |
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| US5511201A (en) * | 1991-03-26 | 1996-04-23 | Hitachi, Ltd. | Data processing apparatus, power supply controller and display unit |
| JPH0566398A (en) * | 1991-09-09 | 1993-03-19 | Seiko Epson Corp | Liquid crystal display device |
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|---|---|
| CN1991952A (en) | 2007-07-04 |
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