CN102968975B - Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof - Google Patents
Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof Download PDFInfo
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- CN102968975B CN102968975B CN201210530117.1A CN201210530117A CN102968975B CN 102968975 B CN102968975 B CN 102968975B CN 201210530117 A CN201210530117 A CN 201210530117A CN 102968975 B CN102968975 B CN 102968975B
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- circuit
- booster
- driving circuit
- control circuit
- liquid crystal
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Abstract
The invention provides a liquid crystal display device and a gate driving circuit voltage control method and control circuit thereof. The control method comprises the following steps of: detecting that a boost voltage of a boosted circuit connected with a gate driving circuit is reduced to a preset value when the liquid crystal display device is shut down, and starting a control circuit connected with the gate driving circuit; and controlling the gate driving circuit to open all grid lines when detecting that a voltage signal output by the control circuit is reduced to 0V, so that electric charges generated by the grid lines neutralize all the electric charges in pixels. According to the scheme, the phenomenon that the low-speed charging (discharging) or a white screen of the liquid crystal display device is caused by startup or shutdown can be avoided.
Description
Technical field
The present invention relates to circuit field, refer to a kind of liquid crystal indicator and grid driving circuit voltage control method thereof and control circuit especially.
Background technology
Usually, liquid crystal indicator (LCD) is when shutdown, equipment operating voltage (VDDIN) first power down, then when the control voltage XON input of the control circuit of the gate driver circuit (Gate IC) of liquid crystal indicator is to VDDIN power down to certain value (if 5V power down is to 4.5V), control circuit is started working, Gate IC is after receiving XON signal intensity to 0V, all grid lines are all opened, neutralize all electric charges in pixel, afterimage phenomena when occurring during to cover up shutdown that picture is abnormal and start shooting.But now inevitably produce shutdown big current, the booster voltage VON that the booster circuit (as DC/DC IC) be connected with Gate IC exports can produce the big current of 200mA ~ 500mA instantaneously, so large electric current often burns the VON cabling on liquid crystal indicator, thus causes charging at a slow speed (or electric discharge) or shield phenomenon in vain.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of liquid crystal indicator and grid driving circuit voltage control method thereof and control circuit, effectively can prevent booster voltage VON cabling from burning, avoid causing the charging at a slow speed of liquid crystal indicator (or electric discharge) due to switching on and shutting down or shielding phenomenon in vain.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of grid driving circuit voltage control method of liquid crystal indicator, comprising:
During liquid crystal indicator shutdown, when detecting that the booster voltage of the booster circuit be connected with grid driving circuit drops to a preset value, open the control circuit be connected with described grid driving circuit;
When the voltage signal detecting that described control circuit exports drops to 0V, control described grid driving circuit and open all grid lines, all electric charges in pixel are fallen in the charging neutrality that described grid line is produced.
Wherein, described preset value is less than 15V.
Wherein, described booster circuit is DC/DC IC, the voltage signal that described control circuit exports be operated in terminal room band in XON voltage signal.
Wherein, described booster circuit is connected with working power VDDIN.
Embodiments of the invention also provide a kind of control circuit, be connected, comprise with the grid driving circuit of liquid crystal indicator:
First test side, for when liquid crystal indicator shuts down, when detecting that the booster voltage of the booster circuit be connected with grid driving circuit drops to a preset value, starts the second test side of described control circuit;
Second test side, for when the output voltage signal of described control circuit drops to 0V, control described grid driving circuit and open all grid lines, all electric charges in pixel are fallen in the charging neutrality that described grid line is produced.
Wherein, the booster circuit that described first test side is connected with grid driving circuit connects; Described second test side is connected with grid driving circuit; Wherein, described first test side is held with the RSTIN of booster circuit by the first divider resistance and is connected, and is also held with the RST of booster circuit by the second divider resistance and is connected.
Wherein, described first test side is connected by printed circuit board (PCB) with described second test side.
Wherein, described booster circuit is DC/DC IC, the voltage signal that described control circuit exports be operated in terminal room band in XON voltage signal, the RSTIN end of described booster circuit is as the input of XON signal, and RST is as the output of XON signal; Described booster circuit is connected with working power VDDIN.
Wherein, described preset value is less than 15V.
Embodiments of the invention also provide a kind of liquid crystal indicator, comprise control circuit as above.
The beneficial effect of technique scheme of the present invention is as follows:
In such scheme, become the output voltage VO N of the booster circuit be connected with grid driving circuit from operating supply voltage XON by adjustment control circuit XON detection signal; When VON voltage is reduced to certain value, XON just starts working, grid driving circuit Gate IC is after receiving XON signal intensity to 0V, all grid lines are all opened, all electric charges in pixel are fallen in the charging neutrality that grid line is produced, thus can effectively prevent because VON value time XON works is still very large, thus cause big current, thus the probability causing VON cabling (VON Pin) to burn, also just avoid owing to burning the charging at a slow speed (or electric discharge) of the liquid crystal indicator caused due to VON Pin during switching on and shutting down or shielding phenomenon in vain.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the grid driving circuit voltage control method of liquid crystal indicator of the present invention;
Fig. 2 is the structural representation of the grid driving circuit voltage control circuit of liquid crystal indicator of the present invention;
The specific embodiment schematic diagram that Fig. 3 is connected with booster circuit for the control circuit shown in Fig. 2.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, embodiments of the invention also provide a kind of grid driving circuit voltage control method of liquid crystal indicator, comprising:
Step 11, during liquid crystal indicator shutdown, when detecting that the booster voltage of the booster circuit be connected with grid driving circuit drops to a preset value, opens the control circuit be connected with described grid driving circuit;
Step 12, when the voltage signal detecting that described control circuit exports drops to 0V, control described grid driving circuit and open all grid lines, all electric charges in pixel are fallen in the charging neutrality that described grid line is produced.
Wherein, described preset value is less than 15V.Described booster circuit is DC/DC IC, the voltage signal that described control circuit exports be operated in terminal room band in XON voltage signal.Described booster circuit is connected with working power VDDIN.
The above embodiment of the present invention, becomes from the operating voltage VDDIN of original testing power supply the output circuit VON detecting booster circuit by adjustment XON detection signal, and wherein booster circuit (DC/DCIC) is powered by working power, when LCD shuts down, working power meeting power down, now, the output voltage of VON also can decline, when the output voltage of VON reduce to during certain value (usually, VON signal is a signal being similar to interchange, magnitude of voltage changes to 15V by 27V), this magnitude of voltage requires also less than the voltage (as 15V) behind the angle that disappears, as 10V, at this moment control circuit XON just starts working, Gate IC is after receiving XON signal intensity to 0V, all grid lines are all opened, all electric charges in pixel are fallen in the charging neutrality that grid line is produced.Due to all row grid lines open time, VON magnitude of voltage is 10V, it is a very little value, in and pixel in electric charge need electric current also can diminish, from VON Pin(VON cabling) electric current that flows through can not burn Von pin, no matter switching on and shutting down repeatedly all there will not be the phenomenon of charging battery or white screen.
As shown in Figure 2, embodiments of the invention also provide a kind of control circuit 23, be connected, comprise with the grid driving circuit 24 of liquid crystal indicator:
First test side, for when liquid crystal indicator shuts down, when detecting that the booster voltage VON of the booster circuit 22 be connected with grid driving circuit 24 drops to a preset value, starts the second test side of described control circuit;
Second test side, for when the output voltage signal XON of described control circuit drops to 0V, control described grid driving circuit (Gate IC) and open all grid lines (Gate) 25, all electric charges in pixel are fallen in the charging neutrality that described grid line 25 is produced.
Wherein, the booster circuit (RSTIN holds and RST holds) that described first test side is connected with grid driving circuit connects; Described second test side is connected with grid driving circuit.Concrete, the first test side of described control circuit, to be held with the RSTIN of booster circuit by the first divider resistance and is connected, and also passes through the second divider resistance and holds with the RST of booster circuit and be connected.
Wherein, described booster circuit is DC/DC IC, the voltage signal that described control circuit exports be operated in terminal room band in XON voltage signal; RSTIN end is as the input of XON signal, and RST is as the output of XON signal; Described booster circuit is also connected with working power (VDDIN) 21.
In addition, described first test side is connected by printed circuit board (PCB) with described second test side.Described preset value is less than 15V.
Booster circuit in this control circuit embodiment of the present invention as shown in Figure 3, RSTIN end is as the input of XON signal, RST is as the output of XON signal, RSTIN end is connected with the first test side of control circuit with RST end, becomes the output circuit VON detecting booster circuit by adjustment XON detection signal from the operating voltage VDDIN of original testing power supply; And wherein booster circuit (DC/DC IC) is powered by working power;
When LCD shuts down, working power VDDIN meeting power down, now, the output voltage of booster circuit VON also can decline, when the output voltage of VON reduce to during certain value (usually, VON signal is a signal being similar to interchange, magnitude of voltage changes to 15V by 27V), this magnitude of voltage requires also less than the voltage (as 15V) behind the angle that disappears, as 10V, at this moment control circuit XON just starts working, and Gate IC is after receiving XON signal intensity to 0V, all opened by all grid lines, all electric charges in pixel are fallen in the charging neutrality that grid line is produced.Due to all row grid lines open time, VON magnitude of voltage is 10V, it is a very little value, in and pixel in electric charge need electric current also can diminish, from VON Pin(VON cabling) electric current that flows through can not burn Von pin, no matter switching on and shutting down repeatedly all there will not be the phenomenon of charging battery or white screen.
Embodiments of the invention also provide a kind of liquid crystal indicator, comprise control circuit as above.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. a grid driving circuit voltage control method for liquid crystal indicator, is characterized in that, comprising:
During liquid crystal indicator shutdown, when detecting that the booster voltage of the booster circuit be connected with grid driving circuit drops to a preset value, open the control circuit be connected with described grid driving circuit; Described preset value is less than 10V;
When the voltage signal detecting that described control circuit exports drops to 0V, control described grid driving circuit and open all grid lines, all electric charges in pixel are fallen in the charging neutrality that described grid line is produced; Described booster circuit is DC/DC IC, the voltage signal that described control circuit exports be operated in terminal room band in XON voltage signal; XON voltage signal is for detecting the booster voltage VON of booster circuit.
2. the grid driving circuit voltage control method of liquid crystal indicator according to claim 1, it is characterized in that, described booster circuit is connected with working power VDDIN.
3. a control circuit, is connected with the grid driving circuit of liquid crystal indicator, it is characterized in that, comprising:
First test side, for when liquid crystal indicator shuts down, when detecting that the booster voltage of the booster circuit be connected with grid driving circuit drops to a preset value, starts the second test side of described control circuit; Described preset value is less than 10V; Described booster circuit is DC/DC IC;
Second test side, for when the output voltage signal of described control circuit drops to 0V, control described grid driving circuit and open all grid lines, all electric charges in pixel are fallen in the charging neutrality that described grid line is produced; The voltage signal that described control circuit exports be operated in terminal room band in XON voltage signal; XON voltage signal is for detecting the booster voltage VON of booster circuit.
4. control circuit according to claim 3, is characterized in that, the booster circuit that described first test side is connected with grid driving circuit connects; Described second test side is connected with grid driving circuit; Wherein, described first test side is held with the RSTIN of booster circuit by the first divider resistance and is connected, and is also held with the RST of booster circuit by the second divider resistance and is connected.
5. control circuit according to claim 4, is characterized in that, described first test side is connected by printed circuit board (PCB) with described second test side.
6. the control circuit according to claim 4 or 5, is characterized in that, the RSTIN of described booster circuit holds the input as XON signal, and RST is as the output of XON signal; Described booster circuit is connected with working power VDDIN.
7. a liquid crystal indicator, is characterized in that, comprises the control circuit as described in any one of claim 3-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210530117.1A CN102968975B (en) | 2012-12-10 | 2012-12-10 | Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210530117.1A CN102968975B (en) | 2012-12-10 | 2012-12-10 | Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof |
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| CN102968975A CN102968975A (en) | 2013-03-13 |
| CN102968975B true CN102968975B (en) | 2015-06-17 |
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| CN201210530117.1A Expired - Fee Related CN102968975B (en) | 2012-12-10 | 2012-12-10 | Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185333B (en) | 2015-09-14 | 2018-05-11 | 深圳市华星光电技术有限公司 | A kind of gate driving circuit of liquid crystal display device |
| CN105976777A (en) * | 2016-06-21 | 2016-09-28 | 深圳天珑无线科技有限公司 | Liquid crystal display screen driving method and device thereof |
| CN105976776A (en) * | 2016-06-21 | 2016-09-28 | 深圳天珑无线科技有限公司 | Liquid crystal display screen discharging method, liquid crystal display screen and driving chip thereof |
| CN109036302B (en) * | 2018-07-20 | 2019-12-24 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display device with a light guide plate |
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| CN100498914C (en) * | 2006-01-10 | 2009-06-10 | 立锜科技股份有限公司 | Power circuit of grid drive circuit of thin film transistor liquid crystal display panel |
| CN100529854C (en) * | 2006-08-25 | 2009-08-19 | 群康科技(深圳)有限公司 | Power supply circuit and LCD using the same |
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| CN1801303A (en) * | 2004-07-30 | 2006-07-12 | 统宝光电股份有限公司 | Afterimage eliminate circuit, integrate circuit, display and electronic device |
| CN1953030A (en) * | 2005-10-20 | 2007-04-25 | 群康科技(深圳)有限公司 | Control circuit device and liquid crystal display with the same |
| CN101271671A (en) * | 2007-03-22 | 2008-09-24 | 台湾类比科技股份有限公司 | Ghost wiping circuit and its method and display equipment control circuit |
| CN101546536A (en) * | 2008-03-26 | 2009-09-30 | 联咏科技股份有限公司 | Liquid crystal display having function of eliminating power-off ghost shadow |
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