CN102622987A - Control circuit for liquid crystal module and control method thereof - Google Patents
Control circuit for liquid crystal module and control method thereof Download PDFInfo
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- CN102622987A CN102622987A CN2012101097861A CN201210109786A CN102622987A CN 102622987 A CN102622987 A CN 102622987A CN 2012101097861 A CN2012101097861 A CN 2012101097861A CN 201210109786 A CN201210109786 A CN 201210109786A CN 102622987 A CN102622987 A CN 102622987A
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- top rake
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Abstract
The invention provides a control circuit for a liquid crystal module and a control method thereof. The control circuit comprises a timer, a counter and a modulator. The timer is used for receiving an enable signal and outputting a time period based on a remote control (RC) circuit; the counter is used for receiving working frequencies and the time period and counting corresponding work cycle number; and the modulator is used for outputting grid angle cutting modulation time according to the work cycle number, preset grid angle cutting time and preset cycle number. The work cycle number corresponding to the working frequencies is counted through the time period, and the grid angle cutting modulation time is obtain by using the counted work cycle number, the preset grid angle cutting time and the preset cycle number. Compared with the prior art, the obtained grid angle cutting modulation time can be changed dynamically along with variation of frame rate, and difference of lower angle cutting time of different working frequencies is made up well, therefore uniformity performance of a liquid crystal panel can be effectively improved.
Description
Technical field
The present invention relates to liquid crystal module, relate in particular to the control circuit and the control method that are used for this liquid crystal module.
Background technology
Usually, LCD comprises that two are provided with the panel of electrode respectively above that and are arranged on the liquid crystal layer between these two panels.Control the transmitance of light through regulating two interelectrode magnitudes of voltage, at this, the voltage between two electrodes is called liquid crystal voltage.In general, the change in voltage on the liquid crystal panel is mainly derived from three aspects: grid voltage changes, source voltage changes and the change in voltage of public electrode wire, wherein changes having the greatest impact to pixel voltage with grid voltage.The numerical value of this change in voltage is called feed-trough voltage (Feed through voltage).The computing formula of this feed-trough voltage can be represented as follows:
Wherein, C
GSBe the grid of thin film transistor (TFT) and the capacitance between source electrode, C
LCBe the capacitance of liquid crystal, C
STBe the pixel storage capacitor value, Δ V
GBe thin film transistor (TFT) its grid voltage poor when opening and turn-off, that is grid high-potential voltage V
GHWith low-potential voltage V
GLBetween difference.Because this feed-trough voltage V
FDBe the principal element that produces Dc bias, thereby reduce feed-trough voltage V
FD, just can reduce the Dc bias of liquid crystal panel, thereby and then improve transmittance and reach good display.
In the prior art, under the different working frequency, the grid voltage difference Δ V of thin film transistor (TFT)
GBe different, thereby can cause the image flicker of liquid crystal panel and the problems of homogeneity aspect.In addition, it is inequality that the grid impulse transmission delay also will cause the feed-trough voltage of diverse location.In view of this, it is different and grid voltage difference that produce causes the defective of liquid crystal panel aspect homogeneity how to solve the work at present frequency, promotes the image display effect of liquid crystal panel, is the problem that person skilled needs to be resolved hurrily.
Summary of the invention
To liquid crystal panel of the prior art existing above-mentioned uniform defect under the different operating frequency, the invention provides a kind of control circuit and control method that is used for this liquid crystal module.
According to one aspect of the present invention, a kind of control method that is used for liquid crystal module is provided, this control method comprises:
Reception is from the frequency of operation of input interface;
According to said frequency of operation, export a grid top rake modulating time;
By said grid top rake modulating time and a top rake resistance, switch a grid high-potential voltage; And
Export a grid impulse to said liquid crystal module.
Preferably, the step of above-mentioned output grid top rake modulating time also comprises: utilize an enable signal, calculate for the moment based on the RC circuit between during; According to said frequency of operation and said time durations T, obtain and the corresponding work period number of this frequency of operation; And, export said grid top rake modulating time by preset grid top rake time, a predetermined period number and a said work period number.
Preferably, the different working frequency is corresponding to different preset grid top rake time and predetermined period number.
Preferably, preset grid top rake time and predetermined period number are stored in an EEPROM.
According to another aspect of the present invention, a kind of control circuit that is used for liquid crystal module is provided, this control circuit comprises:
One timer is used to receive an enable signal, export for the moment based on the RC circuit between during;
One counter receives frequency of operation and said time durations from input interface, calculates and the corresponding work period number of this frequency of operation; And
One modulator is electrically connected to the output terminal of said counter, in order to according to said work period number, a preset grid top rake time and a predetermined period number, exports a grid top rake modulating time.
Preferably, the different working frequency is corresponding to different preset grid top rake time and predetermined period number.
Preferably, preset grid top rake time and predetermined period number are stored in an EEPROM.
Preferably, input interface is a Low Voltage Differential Signal (LVDS, a Low Voltage Differential Signal) interface.
Preferably, liquid crystal module is the liquid crystal module of a Thin Film Transistor-LCD.
Adopt the control circuit that is used for liquid crystal module of the present invention; During between exporting for the moment based on the RC circuit; Calculate then and the corresponding work period number of frequency of operation, and then utilize the work period number that calculated and preset grid top rake time and predetermined period number to obtain grid top rake modulating time.Than prior art; The resulting grid top rake of the present invention modulating time can dynamically change with the conversion of frame rate (frame rate); Remedy the length difference of top rake time under the different operating frequency well, thereby can promote the homogeneity performance of liquid crystal panel effectively.
Description of drawings
The reader with reference to advantages after the embodiment of the present invention, will become apparent various aspects of the present invention.Wherein,
Fig. 1 illustrates according to an embodiment of the present invention, exports the circuit theory diagrams of grid impulse through the grid top rake modulating time that control circuit produced;
Fig. 2 illustrates the structured flowchart of the control circuit among Fig. 1; And
Fig. 3 illustrates according to another embodiment of the present invention, is used for the FB(flow block) of the control method of liquid crystal module.
Embodiment
For technology contents that the application is disclosed is more detailed and complete, can be with reference to accompanying drawing and following various specific embodiments of the present invention, identical mark is represented same or analogous assembly in the accompanying drawing.Yet the embodiment that those of ordinary skill in the art should be appreciated that hereinafter to be provided is used for limiting the scope that the present invention is contained.In addition, accompanying drawing only is used for schematically explaining, does not draw according to its life size.
With reference to the accompanying drawings, the embodiment of various aspects of the present invention is done further to describe in detail.
Fig. 1 illustrates according to an embodiment of the present invention, exports the circuit theory diagrams of grid impulse through the grid top rake modulating time that control circuit produced.
With reference to Fig. 1, the grid impulse output module of liquid crystal module comprises a control circuit 10, a grid top rake control die set (gate shading control block) 20 and one gate drivers 30.Control circuit 10 receives a frequency of operation, and exports a grid top rake modulating time YV1C according to this frequency of operation, and at this, YV1C also can represent the grid top rake modulation signal of control circuit 10 outputs.For example, when control circuit 10 receives the different working frequency, export different grid top rake modulating time YV1C according to the corresponding work frequency, and then reach the effect of improving the grid impulse different wave shape.In one embodiment, this control circuit 10 is a special IC (ASIC, Application Specific Integrated Circuit).
Grid top rake control die set 20 is electrically connected to control circuit 10, is used to receive this grid top rake modulating time YV1C, and switches a grid high-potential voltage Vghc according to this grid top rake modulating time YV1C.Gate drivers 30 is electrically connected to the output terminal of grid top rake control die set 20, is used for exporting a grid impulse according to the moment (or moment of grid low-potential voltage) of switching grid high-potential voltage Vghc.Wherein, Vg_on representes the grid high voltage.What need particularly point out is, the grid impulse that gate drivers 30 is exported is under the different working frequency, and its pulse waveform is basic identical, thereby can reduce grid voltage and change the influence to pixel voltage, thereby makes the homogeneity performance of liquid crystal panel better.
Below will introduce the implementation procedure of grid top rake modulating time YV1C in detail.Fig. 2 illustrates the structured flowchart of the control circuit among Fig. 1.With reference to Fig. 2, this control circuit 10 comprises a timer 102, a counter 104 and a modulator 106.
This timer 102 is used to receive an enable signal (as: scanning trigger pip YDIO), and T during between exporting for the moment based on the RC circuit.In Fig. 2, the RC circuit is connected in series by resistance R 2 and capacitor C 2 and forms, and its time durations T can be corresponding to the time constant of resistance R 2 and capacitor C 2.This enable signal is used for the triggering moment and the termination moment that control capacitance C2 discharges and recharges.Counter 104 receives the frequency of operation (as: frequency of data frequency signal DCLK) and the time durations T that comes self-timer 102 from input interface, calculates and number N count of corresponding work period of this frequency of operation.For example, might as well define frequency of operation is T
LVDS DCLK, then number N count equals time durations T/T the work period
LVDS DCLKModulator 106 is electrically connected to the output terminal of counter 104, in order to according to work period number N count, a preset grid top rake time YV1C_set and a predetermined period number N set, exports a grid top rake modulating time YV1C.In more detail, grid top rake modulating time YV1C can be expressed as:
YV1C＝YV1C_set×Ncount/Nset
Should be pointed out that different working frequency T
LVDS DCLK, corresponding to different preset grid top rake time YV1C_set and predetermined period number N set.Thereby, utilize control circuit 10 of the present invention, can make grid top rake modulating time follow the variation of frame rate and change, and then keep the homogeneity performance of liquid crystal panel under the different operating frequency.
In one embodiment, preset grid top rake time YV1C_set and predetermined period number N set are stored in an EEPROM (EEPROM, Electrically Erasable Programmable Read-Only Memory).
In one embodiment, input interface is a Low Voltage Differential Signal (LVDS, a Low Voltage Differential Signal) interface.
Fig. 3 illustrates according to another embodiment of the present invention, is used for the FB(flow block) of the control method of liquid crystal module.
With reference to Fig. 3, and combine above-mentioned Fig. 1 and Fig. 2, in this control method, at first execution in step S31 receives the frequency of operation from input interface.For example, be received from the frequency of operation T of input interface LVDS through the counter in the control circuit 10 104
LVDS DCLKThen, in step S33, according to this frequency of operation, export a grid top rake modulating time YV1C, at this, YV1C also can represent the grid top rake modulation signal of control circuit 10 outputs.Then, execution in step S35 by a grid top rake modulating time YV1C and a top rake resistance R, switches a grid high-potential voltage Vghc.At last, in step S37, export a grid impulse to liquid crystal module through gate drivers.
In one embodiment, the step of above-mentioned output grid top rake modulating time also comprises: utilize an enable signal, calculate for the moment based on the RC circuit between during T; According to frequency of operation and time durations T, obtain and number N count of corresponding work period of this frequency of operation; And by preset grid top rake time YV1C_set, a predetermined period number N set and a work period number N count, output grid top rake modulating time YV1C.
In one embodiment, the different working frequency is corresponding to different preset grid top rake time and predetermined period number.
In one embodiment, preset grid top rake time and predetermined period number are stored in an EEPROM.
Adopt the control circuit that is used for liquid crystal module of the present invention; During between exporting for the moment based on the RC circuit; Calculate then and the corresponding work period number of frequency of operation, and then utilize the work period number that calculated and preset grid top rake time and predetermined period number to obtain grid top rake modulating time.Than prior art; The resulting grid top rake of the present invention modulating time can dynamically change with the conversion of frame rate (frame rate); Remedy the length difference of top rake time under the different operating frequency well, thereby can promote the homogeneity performance of liquid crystal panel effectively.
In the preceding text, illustrate and describe embodiment of the present invention.But those skilled in the art can understand, and under situation without departing from the spirit and scope of the present invention, can also specific embodiments of the invention do various changes and replacement.These changes and replacement all drop in claims of the present invention institute restricted portion.
Claims (9)
1. a control method that is used for liquid crystal module is characterized in that, this control method comprises:
Reception is from the frequency of operation of input interface;
According to said frequency of operation, export a grid top rake modulating time;
By said grid top rake modulating time and a top rake resistance, switch a grid high-potential voltage; And
Export a grid impulse to said liquid crystal module.
2. control method according to claim 1 is characterized in that, the step of above-mentioned output grid top rake modulating time also comprises:
Utilize an enable signal, calculate for the moment based on the RC circuit between during;
According to said frequency of operation and said time durations T, obtain and the corresponding work period number of this frequency of operation; And
By preset grid top rake time, a predetermined period number and a said work period number, export said grid top rake modulating time.
3. control method according to claim 2 is characterized in that, the different working frequency is corresponding to different preset grid top rake time and predetermined period number.
4. control method according to claim 2 is characterized in that, preset grid top rake time and predetermined period number are stored in an EEPROM.
5. a control circuit that is used for liquid crystal module is characterized in that, this control circuit comprises:
One timer is used to receive an enable signal, export for the moment based on the RC circuit between during;
One counter receives frequency of operation and said time durations from input interface, calculates and the corresponding work period number of this frequency of operation; And
One modulator is electrically connected to the output terminal of said counter, in order to according to said work period number, a preset grid top rake time and a predetermined period number, exports a grid top rake modulating time.
6. control circuit according to claim 5 is characterized in that, the different working frequency is corresponding to different preset grid top rake time and predetermined period number.
7. control circuit according to claim 5 is characterized in that, preset grid top rake time and predetermined period number are stored in an EEPROM.
8. control circuit according to claim 5 is characterized in that, said input interface is a Low Voltage Differential Signal (LVDS, a Low Voltage Differential Signal) interface.
9. control circuit according to claim 5 is characterized in that, said liquid crystal module is the liquid crystal module of a Thin Film Transistor-LCD.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101097861A CN102622987A (en) | 2012-04-12 | 2012-04-12 | Control circuit for liquid crystal module and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101097861A CN102622987A (en) | 2012-04-12 | 2012-04-12 | Control circuit for liquid crystal module and control method thereof |
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| CN2012101097861A Pending CN102622987A (en) | 2012-04-12 | 2012-04-12 | Control circuit for liquid crystal module and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017080298A1 (en) * | 2015-11-09 | 2017-05-18 | Boe Technology Group Co., Ltd. | Display apparatus, drive circuit, and drive method |
| WO2017185437A1 (en) * | 2016-04-26 | 2017-11-02 | 深圳市华星光电技术有限公司 | Chamfer regulating circuit and liquid crystal display having chamfer regulating circuit |
-
2012
- 2012-04-12 CN CN2012101097861A patent/CN102622987A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017080298A1 (en) * | 2015-11-09 | 2017-05-18 | Boe Technology Group Co., Ltd. | Display apparatus, drive circuit, and drive method |
| US10304403B2 (en) | 2015-11-09 | 2019-05-28 | Boe Technology Group Co., Ltd. | Display apparatus and drive circuit thereof |
| WO2017185437A1 (en) * | 2016-04-26 | 2017-11-02 | 深圳市华星光电技术有限公司 | Chamfer regulating circuit and liquid crystal display having chamfer regulating circuit |
| US10192496B2 (en) | 2016-04-26 | 2019-01-29 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Angle cutting modulating circuit and liquid crystal display device having the angle cutting modulating circuit |
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Application publication date: 20120801 |