CN101359456B - LCD drive g device and drive method - Google Patents
LCD drive g device and drive method Download PDFInfo
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- CN101359456B CN101359456B CN200710140039A CN200710140039A CN101359456B CN 101359456 B CN101359456 B CN 101359456B CN 200710140039 A CN200710140039 A CN 200710140039A CN 200710140039 A CN200710140039 A CN 200710140039A CN 101359456 B CN101359456 B CN 101359456B
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- data line
- voltage
- display unit
- lcd drive
- output current
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Abstract
The invention aims to provide a liquid crystal drive device which can automatically adjust the drive force according the panel adopted by the drive device. The invention provides a liquid crystal drive device which can automatically adjust the drive force. The drive device comprises an adjustable resistor coupled with a data line of the liquid crystal display panel and used for receiving an input voltage and outputting an output current to the data line of the liquid crystal display panel; a comparing unit is coupled with a data line of the liquid crystal display panel and used for receiving the voltage of a display unit of the data line and comparing the voltage with the preset voltage to generate a result; an adjusting unit is used for adjusting the adjustable resistor according to the comparison result, so as to regulate the magnitude of the current.
Description
Technical field
The invention relates to a kind of LCD drive g device and driving method
Background technology
Shown in Figure 1 is the schematic equivalent circuit of available liquid crystal display panel and driving circuit thereof.As shown in the figure; LCD panel module 100 is to be interwoven by crisscross data line (D1-Dm) and gate line (G1-Gn); Wherein the data voltage of data line is to be provided by one source pole driver 11; And the scanning voltage of gate line is to be provided by 12 of gate pole drivers, and staggered data line and the gate line of each group is to be used for controlling a display unit P, and the equivalent electrical circuit of each display unit P comprises a membrane transistor, a storage capacitors Cs and a liquid crystal capacitance Clc; The gate of membrane transistor is connected gate line (G1-Gn) and data line (D1-Dm) respectively with source electrode, and its drain is to be connected with storage capacitors Cs.
The method of general driving liquid crystal panel is to apply scan voltage in regular turn on gate line (G1-Gn); To open membrane transistor; And then storage capacitors Cs and liquid crystal capacitance Clc are charged via membrane transistor with data voltage through data line; And make liquid crystal deflecting element, and when the scanning voltage on the gate line (G1-Gn) was removed and membrane transistor is closed, storage capacitors Cs and liquid crystal capacitance Clc can keep its data voltage.
Generally speaking, the display speed of display panels is that common standard is arranged, for example: 60 of per seconds; Therefore the driving circuit of display panels must be in the regular hour be charged to predetermined value with the voltage of storage capacitors Cs and liquid crystal capacitance Clc, yet, the display panels of different size; Its liquid crystal picture element is to have different capacitances and resistance value, and in i Δ t=c Δ V formula, i is a current value; Δ t is the duration of charging; C is a capacitance, and Δ V is a voltage difference, if the required Δ V of the storage capacitors Cs of display unit and liquid crystal capacitance Clc is constant; And the electric capacity c of different size display panels is inequality; But because display speed is (is duration of charging Δ t for fixing) of fixing, thus the demand that charging current meets this display panels can only be revised, so that in the set time, the voltage of display unit is charged to predetermined value.
Yet; The driving force of available liquid crystal display panel drive device (being the charging current size) has just configured to the particular fluid LCD panel before manufacturing in advance; Meaning i.e. this drive unit just can only be applicable to the particular fluid LCD panel, and different display panels just needs to prepare different drive units, so is considerably inconvenient; For this reason, the present invention proposes a solution at this.
Summary of the invention
One object of the present invention is to propose a kind of LCD drive g device, and it can adjust its driving force voluntarily with employed panel.
Another object of the present invention is to propose a kind of LCD drive method, it can adjust its driving force with different panels.
For achieving the above object; The present invention proposes a kind of LCD drive g device that can oneself adjustment driving force, and it comprises: an adjustable resistance is coupled to the data line of a display panels; After it received an input voltage, output one outputed current to the data line of this display panels; One comparing unit is coupled to a data line of this display panels, receives the voltage of the display unit on this data line, and compares with a predetermined voltage, to produce a comparative result; And an adjustment unit, according to this this adjustable resistance of comparative result adjustment, to change the size of this output current.
In addition, the present invention also proposes a kind of LCD drive method that can oneself adjustment driving force, and it comprises: produce one output current to a display panels data line, charge in order to a display unit to this data line; The voltage and a predetermined voltage of this display unit are compared, and produce a comparative result; And, according to this comparative result, adjust the size of this output current.
LCD drive g device of the present invention and driving method owing to its voltage and predetermined voltage with display unit compares, and can be adjusted its driving force according to this comparative result voluntarily, therefore the demand of applicable different panels.
Description of drawings
Fig. 1 is the schematic equivalent circuit of available liquid crystal display panel and driving circuit thereof;
Fig. 2 is the block schematic diagram of LCD drive g device of the present invention;
Fig. 3 is an embodiment synoptic diagram of LCD drive g device of the present invention;
Fig. 4 is the process flow diagram of LCD drive method of the present invention.
Embodiment
Shown in Figure 2 is the module diagram of LCD drive g device of the present invention, as shown in the figure, and LCD drive g device 200 of the present invention comprises an adjustable resistance 21, a comparing unit 22 and an adjustment unit 23.Adjustable resistance 21 receives an input voltage V
InAfter, export an output current I
OutTo the data line of display panels 24, wherein, this output current I
OutBe in order to the display unit on the display panels 24 is charged, meaning is promptly charged to the storage capacitors and the liquid crystal capacitance of display unit.Comparing unit 22 is coupled to a data line of this display panels 22, in order to receiving the voltage of the display unit on this data line, and with a predetermined reference voltage V
RefCompare, to produce a comparative result.23 resistance values of adjustment unit according to comparative result adjustment adjustable resistance 21, and then change output current I
Out, and make output current I
OutAfter unit of display charging one period set time, can reach desirable predetermined voltage.
Fig. 3 is an embodiment synoptic diagram of LCD drive g device of the present invention, and is as shown in the figure, input voltage V
InInput in the adjustable resistance 21 via impact damper 25, adjustable resistance 21 is the data lines that couple display panels 24 ', and when scanning voltage was opened the membrane transistor of display unit on the data line, adjustable resistance 21 promptly can be exported output current I
OutTo display unit, charge in order to storage capacitors and liquid crystal capacitance to display unit, behind one section special time, the storage capacitors of display unit and liquid crystal capacitance promptly are recharged to a stored voltage V
SIn this embodiment, comparing unit 22 is to be made up of a sensing amplifier, and an input end of this sensing amplifier is a data line D who is coupled to display panels
x, another input end of sensing amplifier then receives reference voltage V
Ref, comparing unit 22 receives stored voltage V
SAnd with a predetermined reference voltage V
RefCompare and produce a comparative result, can know stored voltage V by comparative result
SWith reference voltage V
RefBetween big or small gap.
Then, adjustment circuit 23 is adjusted the resistance value of adjustable resistance 21 again according to the comparative result of comparing unit 22, change output current I
OutSize, and make stored voltage V
SCan be more near reference voltage V
RefFor example, when comparative result be stored voltage V
SLess than reference voltage V
RefThe time, 23 in circuit of adjustment can be turned the resistance value of adjustable resistance down, and makes output current I
OutBecome big, in the identical time, output current I
OutBecome and to make stored voltage V greatly
SBecome big, otherwise, when comparative result is stored voltage V
SGreater than reference voltage V
RefThe time, 23 in circuit of adjustment can be transferred the resistance value of adjustable resistance 21 big, and makes output current I
OutDiminish.
When scanning voltage in regular turn by gate line G
1To G
nWhen inswept, will open data line D in regular turn
xOn display unit P
X1To P
XnIn membrane transistor, and make output current I
OutCan the display unit of opening be charged, whenever scanning voltage is opened the membrane transistor of a display unit and let output current I
OutAfter charging electricity, comparing unit 22 promptly can carry out once the stored voltage V of this display unit
SWith reference voltage V
RefComparison, adjustment unit 23 then can be adjusted the resistance value of adjustable resistance 21 according to comparative result, for example, as the inswept gate line G of scanning voltage
1After, display unit P
X1Stored stored voltage V
SPromptly compared by comparing unit 22, adjustment unit 23 then carries out the resistance value adjustment of an adjustable resistance 21 according to comparative result, and then adjustment output current I
OutSize, then, as the inswept gate line G of scanning voltage
2The time, promptly with adjusted output current I
OutTo display unit P
X2Charge; After charging electricity, comparing unit 22 compares with the stored voltage and the reference voltage of display unit again, and the inferior according to this again comparative result of adjustment unit 23 is adjusted the resistance value of adjustable resistance 21 once more; Hence one can see that; When this display panels had n bar gate line, a picture of then every demonstration (frame) can be adjusted resistance value n time, and makes display unit via output current I
OutAfter the charging, stored voltage V
SMore can be similar to reference voltage V
Ref
In a preferred embodiment, for avoiding influencing the normal demonstration of display panels, comparing unit 22 and adjustment unit 22 only during first display frame after the display panels start, the action that just compares and adjust, and input voltage V
InThen adjust the specific voltage of usefulness for adjustable resistance.
Cooperate above-mentioned LCD drive g device, the present invention proposes a kind of LCD drive method, please refer to Fig. 4; Fig. 4 is the process flow diagram of LCD drive method of the present invention, at first, and in step S1; Generation one outputs current to the data line of display panels; In order to the display unit on the data line is charged, wherein, this output current can input to by an input voltage and exported behind the adjustable resistance.Step S2 compares stored voltage and a predetermined reference voltage after the display unit charging, and produces a comparative result, wherein this reference voltage be by display unit be recharged afterwards the magnitude of voltage that reaches of hope.At last, step S3 is according to comparative result, and the size of adjustment output current when stored voltage during less than reference voltage, is to increase output current, and when stored voltage during greater than reference voltage, then reduces output current.
In said method; When scan voltage inputed to the plural gate line of this display panels in regular turn, the plural display unit on this data line can be unlocked and be recharged in regular turn, after having a display unit to be recharged on this data line; Promptly let stored voltage and this predetermined voltage of display unit carry out once relatively producing this comparative result; According to this output current of this comparative result adjustment, so repeat to adjust output current again, make the stored voltage of display unit can be more near reference voltage.In addition, in a preferred embodiment, only during first display frame after the display panels start, the action that just compares and adjust is to avoid influencing the normal demonstration of display panels for liquid crystal drive method of adjustment of the present invention.
In sum, LCD drive g device of the present invention and driving method can be adjusted its driving force (being output current) voluntarily, make the demand of its suitable different panels, can effectively improve the deficiency of prior art.
The above is merely preferred embodiment of the present invention, and all any impartial variations of doing according to claim of the present invention and modification all should be included within the claim of scope of the present invention.
Claims (9)
1. LCD drive g device, it is characterized in that: it comprises:
One adjustable resistance has one first end and one second end; This second end is connected directly to a data line of a display panels; After this first termination is received an input voltage, output current to this data line of this display panels by this second end output one of this adjustable resistance;
One comparing unit is connected directly to this data line of this display panels, receives the voltage of the display unit on this data line, and compares with a predetermined voltage, to produce a comparative result; And
One adjustment unit is according to this this adjustable resistance of comparative result adjustment, to change the size of this output current.
2. LCD drive g device as claimed in claim 1 is characterized in that: the voltage of said display unit is storage capacitors and the liquid crystal capacitance charging back stored voltage of this output current to this display unit.
3. LCD drive g device as claimed in claim 1; It is characterized in that: when scan voltage inputs to the plural gate line of this display panels in regular turn; Plural display unit on this data line can be unlocked and be recharged in regular turn; After having a display unit to be recharged on this data line, this comparing unit promptly carries out once relatively producing this comparative result, and this adjustment unit is then according to this this adjustable resistance of comparative result adjustment.
4. LCD drive g device as claimed in claim 1 is characterized in that: said comparing unit is to be made up of a sensing amplifier.
5. LCD drive g device as claimed in claim 1 is characterized in that: said comparing unit and this adjustment unit only move first picture after the start of this display panels.
6. LCD drive method, it is characterized in that: it comprises:
Provide input voltage to an adjustable resistance one first end and by one second end of this adjustable resistance produce one output current to a display panels a data line; In order to the display unit on this data line is charged, wherein this second end of this adjustable resistance is connected directly to this data line;
Utilize a comparing unit to be connected directly to this data line of this display panels, compare with a voltage and a predetermined voltage, and produce a comparative result this data line; And
According to this comparative result, adjust this adjustable resistance to change the size of this output current.
7. LCD drive method as claimed in claim 6; It is characterized in that: when scan voltage inputs to the plural gate line of this display panels in regular turn; The plural display unit of this data line can be unlocked and be recharged in regular turn; After having a display unit to be recharged on this data line, promptly carry out once relatively producing this comparative result, again according to this this output current of comparative result adjustment with this predetermined voltage.
8. LCD drive method as claimed in claim 6 is characterized in that: said LCD drive method only acts on first picture after this display panels start.
9. LCD drive method as claimed in claim 6 is characterized in that: the voltage of said display unit is storage capacitors and the liquid crystal capacitance charging back stored voltage of this output current to this display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710140039A CN101359456B (en) | 2007-08-03 | 2007-08-03 | LCD drive g device and drive method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710140039A CN101359456B (en) | 2007-08-03 | 2007-08-03 | LCD drive g device and drive method |
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| Publication Number | Publication Date |
|---|---|
| CN101359456A CN101359456A (en) | 2009-02-04 |
| CN101359456B true CN101359456B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710140039A Active CN101359456B (en) | 2007-08-03 | 2007-08-03 | LCD drive g device and drive method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105405425B (en) * | 2015-12-24 | 2018-09-18 | 昆山龙腾光电有限公司 | A kind of driving current control switching circuit and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341018A (en) * | 2004-05-25 | 2005-12-08 | Nec Electronics Corp | Drive circuit, operating state detection circuit, and display device |
| WO2007080735A1 (en) * | 2006-01-13 | 2007-07-19 | Toshiba Matsushita Display Technology Co., Ltd. | Display device and its driving method, and terminal device |
-
2007
- 2007-08-03 CN CN200710140039A patent/CN101359456B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341018A (en) * | 2004-05-25 | 2005-12-08 | Nec Electronics Corp | Drive circuit, operating state detection circuit, and display device |
| WO2007080735A1 (en) * | 2006-01-13 | 2007-07-19 | Toshiba Matsushita Display Technology Co., Ltd. | Display device and its driving method, and terminal device |
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| Publication number | Publication date |
|---|---|
| CN101359456A (en) | 2009-02-04 |
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Effective date of registration: 20191231 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MediaTek.Inc Address before: Taiwan Hsinchu County Tai Yuan Street China jhubei City, No. 26 4 floor 1 Patentee before: MStar Semiconductor Co., Ltd. |