CN1466122A - LCD device and driving method thereof - Google Patents
LCD device and driving method thereof Download PDFInfo
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- CN1466122A CN1466122A CNA021405204A CN02140520A CN1466122A CN 1466122 A CN1466122 A CN 1466122A CN A021405204 A CNA021405204 A CN A021405204A CN 02140520 A CN02140520 A CN 02140520A CN 1466122 A CN1466122 A CN 1466122A
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Abstract
The invention is a kind of control circuit which receives n bits digital input data and controls the level driver in order to provide a voltage corresponding to the input data to LCD board in 1H period according to the standard voltage. Besides, the control circuit forms the gradation data through reversing each bit of the input data, and controls the level driver in order to provide voltage to LCD board in next 1H period. On the conditions, gradation-gamma amendatory voltage relation is symmetrical to the centre of the maximal gradation grade and the minimal gradation grade.
Description
Technical field
The present invention relates to liquid crystal indicator and driving method thereof, particularly the liquid crystal indicator of usage level row inverting method and driving method.
Background technology
In general, liquid crystal indicator uses and exchanges (AC) driving method.This is that will shorten its serviceable life because if drive liquid crystal layer with direct current (DC) voltage.As the driving method that is used to reduce flicker during well-known AC drives is the horizontal line inverting method of horizontal synchronizing cycle (1H cycle) reversed polarity in each unit.
For example, as shown in Figure 1, adopt the liquid crystal indicator of existing driving method to have switched circuit 107, the synchronizing signal that it and control circuit 101 provide is synchronously switched the output that comes from first normal voltage generation circuit 106a that produces the positive polarity normal voltage and the second normal voltage generation circuit 106b that produces the negative polarity normal voltage.The output of switched circuit 107 is connected to a plurality of horizontal drivers 103 that are connected with the signal line of liquid crystal board 105 jointly.
Control circuit 101 response is presented at the input data of the image on the liquid crystal board 105, and the input gray level data corresponding to 1H cycle of a unit make horizontal driver 103 that the voltage that the first normal voltage generation circuit 106a provides is applied to liquid crystal board 105.During the next 1H cycle, it makes horizontal driver 103 that the voltage that the second normal voltage generation circuit 106b provides is applied to liquid crystal board 105.
In addition, control circuit 101 makes common electric voltage generation circuit 104 that common electric voltage is applied to liquid crystal board 105.For each pixel capacitors in the liquid crystal board 105, when vertical driver 102 had been selected the one scan circuit, horizontal driver 103 provided a signal voltage corresponding to gradation data.Simultaneously, common electric voltage generation circuit 104 provides common electric voltage for the public electrode with respect to this pixel capacitors.Then, at the gray scale image that is presented on the liquid crystal board 105 between pixel capacitors and the public electrode corresponding to voltage gap.Counter-rotating this common electric voltage and offer LCD panel 105 in the cycle of each 1H is so that amplify the effective voltage of each pixel that imposes on liquid crystal board 105.It is to reverse by going of each 1H cycle to realize that the AC of this liquid crystal board drives.
Fig. 2 A shows is that the gray scale-γ of liquid crystal indicator revises voltage relationship.Dotted line represents that the gray scale that the applies voltage-transfer characteristic-γ that does not consider liquid crystal layer revises voltage relationship, and solid line has represented to add the relation that the gray scale-γ of the correction of the voltage-transfer characteristic that is applied of considering liquid crystal layer revises voltage.Because the voltage-transfer characteristic that applies of liquid crystal layer is not that represent with straight line or nonlinear, revise the relation of voltage according to the gray scale of representing with solid line among the figure-γ, driving voltage is imposed on liquid crystal board, to realize that corresponding to the input data in actual liquid crystal indicator gray scale shows.
Impose on the liquid crystal board 105 of prior art liquid crystal indicator that the gray scale of representing based on solid line shown in Figure 1-γ revises the relation of voltage if γ is revised voltage, the voltage that gray scale X1 is applied will be VF, and will be VG in the next 1H cycle to gray scale X2.Then, the effective voltage that imposes on the liquid crystal layer of liquid crystal board 105 will be respectively | VF-VC| and | VG-VC|, notice that VC represents to impose on the common potential of the public electrode on pixel capacitors opposite.As a result, shown in Fig. 2 B, effective voltage level between the cycle of 1H cycle and next 1H (F, G) different each other.The reason of flicker that Here it is.
In addition, because switched circuit 107 selects to produce the normal voltage generation circuit 106a or the 106b of positive or negative polarity normal voltage, to provide normal voltage to horizontal driver 103, complexity so the circuit structure of the liquid crystal indicator of prior art shown in Figure 1 will become.Owing to the power source voltage Vcc that offers normal voltage generation circuit 106a, 106b is very high, switched circuit 107 must be stood high pressure again.The cost of this device will be very high like this.
Summary of the invention
The purpose of this invention is to provide a kind of liquid crystal indicator and driving method thereof, it can adopt relative simple circuit configuration to reduce flicker by using row inversion driving technology.
Liquid crystal indicator according to the present invention comprises: the liquid crystal board with a plurality of trace wirings and a plurality of signal lines, the normal voltage generation circuit of a plurality of normal voltages is provided, scan the vertical driver of the trace wiring of described liquid crystal board one by one, a plurality of normal voltages that reception is provided by described normal voltage generation circuit, and the signal line of giving described liquid crystal board provides the horizontal driver of grayscale voltage, and produces gradation data by the polarity of each counter-rotating input synchronizing cycle data, and the controlling level driver will be so that will impose on the control circuit of liquid crystal board corresponding to the normal voltage of described gradation data.To revise voltage relationship be symmetrical with respect to the central point between the highest gray shade scale and the minimum gray shade scale to the gray scale gray-scale displayed-γ that is used for that is used by described control circuit.
In this liquid crystal indicator, gray scale-γ is revised voltage relationship and is represented with straight line, and the gradation data of horizontal driver response input is revised voltage with γ and imposed on liquid crystal board to satisfy this relation.But this gray scale-γ revises voltage relationship can be represented without straight line, for example curve or polygonal line.
For example, this input data are numerical datas, and control circuit is by each gradation data that comes polarization to reverse in the inverted population digital data.
In addition, if normal voltage generation circuit has ladder type resistance, can determine that by the resistance value that ladder type resistance is set this gray scale-γ revises voltage relationship.
Driving method according to liquid crystal indicator of the present invention comprises step: the horizontal driver of a plurality of normal voltages to liquid crystal board is provided, and scans liquid crystal board with the polarity that is used for the input data that gray scale shows of vertical driver by each row that reverses.It is symmetrical with respect to the central point between the highest gray shade scale and the minimum gray shade scale that the described gray scale of using in gray scale shows-γ revises voltage relationship.
In this case, gray scale-γ is revised voltage relationship represent, and the gradation data of horizontal driver response input is revised voltage with γ and imposed on liquid crystal board to satisfy this relation with straight line.
But this gray scale-γ revises voltage relationship can be represented without straight line, but for example represents with curve or polygonal line.
Brief Description Of Drawings
Fig. 1 is the block scheme of the liquid crystal indicator of explanation prior art;
Fig. 2 A shows that the gray scale-γ that uses in the driving method of liquid crystal indicator of prior art revises voltage relationship figure, and Fig. 2 B shows the oscillogram that imposes on according to the signal of the liquid crystal board of the driving method of prior art;
Fig. 3 is the block scheme of explanation according to the liquid crystal indicator of first embodiment of the invention;
Fig. 4 A shows that the gray scale-γ that uses in the driving method of liquid crystal indicator of first embodiment of the invention revises voltage relationship figure; Fig. 4 B shows the oscillogram impose on according to the signal of the liquid crystal board of this driving method; And
Fig. 5 A is that the gray scale-γ that uses in the driving method of demonstration according to the liquid crystal indicator of second embodiment of the invention revises voltage relationship figure; Fig. 5 B shows the oscillogram impose on according to the signal of the liquid crystal board of this driving method.
The explanation of preferred embodiment
Now, will describe embodiments of the invention with reference to the accompanying drawings in detail.Fig. 3 is the liquid crystal indicator block scheme of explanation according to the first embodiment of the present invention.Liquid crystal indicator according to the present invention has liquid crystal board 5, normal voltage generation circuit 6, vertical driver 2, a plurality of horizontal drivers 3, and control circuit 1.Liquid crystal board 5 is equipped with a plurality of trace wirings and a plurality of signal line.Normal voltage generation circuit 6 provides a plurality of normal voltages.Vertical driver 2 scans the trace wiring of liquid crystal board 5 one by one.A plurality of horizontal drivers 3 offer grayscale voltage the signal line that receives the liquid crystal board 5 of a plurality of normal voltages from normal voltage generation circuit 6.Polarity by counter-rotating input data produces gradation data to control circuit 1 in each unit level synchronizing cycle, and the controlling level driver 3 then, so that normal voltage corresponding to gradation data is provided for liquid crystal board 5.
Normal voltage generation circuit 6 has the ladder type resistance between power source voltage Vcc of being connected and the normal voltage, and the normal voltage V0-V10 of 11 grades is provided for a plurality of horizontal drivers 3.
According to above-mentioned normal voltage, during a horizontal synchronizing cycle (1H cycle), control circuit 1 receives the digital input data of n position, and controlling level driver 3 will be so that will offer liquid crystal board 5 corresponding to this voltage of importing data.In addition, the polarity of each that control circuit 1 is imported data by reversing is come the gradation data of polarization counter-rotating, and, make horizontal driver 3 that the signal line of liquid crystal board 5 will be provided corresponding to the voltage based on the gradation data of above-mentioned normal voltage that is produced in the next 1H cycle.For example, under the situation of 64 grade gray scales,, can obtain 60 and as gray scale X2 by each position at these 6 X1 (3) of next 1H periodic reversal if be 3 at 1H cycle gray scale X1.If gray scale X2 is 60 in the 1H cycle, then when the counter-rotating this 6 bit data X2 (60) each the time, X2 becomes 3 to next 1H cycle gray scale.
In addition, the signal that reversed at each 1H horizontal synchronizing cycle of control circuit 1 output signal level.The signal of common electric voltage output circuit 4 amplification levels counter-rotatings, and they are offered the relative public electrode of pixel capacitors of liquid crystal board 5 as common electric voltage.If this common electric voltage also is the voltage of level counter-rotating, the effective voltage of the liquid crystal layer that imposes on liquid crystal board 5 of then can raising.
Fig. 4 A is that the gray scale-γ that uses in the driving method of explanation according to the liquid crystal indicator of first embodiment of the invention revises voltage relationship figure; Fig. 4 B is presented at the oscillogram that imposes on the signal of liquid crystal board according to above-mentioned driving method operating period.
Solid line among Fig. 4 A shows that positive polarity gray scale-γ revises voltage relationship, and dotted line shows that negative polarity gray scale-γ revises voltage relationship.In an embodiment of the present invention, being used for this gray scale-γ that gray scale shows, to revise voltage relationship be symmetrical with respect to the central point between the highest gray shade scale and the minimum gray shade scale, and can represent with straight line.For satisfying this relation between gray scale and the voltage, in response to the gradation data of input, horizontal driver 3 applies γ correction voltage to the signal line of liquid crystal board 5.Under the situation of 64 grade gray scales, the highest ranking gray scale is 63, and the lowest class gray scale is 0.
To the gradation data of input when the 1H cycle produces the γ correction voltage that will apply, revise voltage relationship with reference to positive polarity gray scale-γ, and to the gradation data of input when the next 1H cycle produces the γ correction voltage that will apply, revise voltage relationship with reference to negative polarity gray scale-γ.For example, the voltage that applies in the 1H cycle for display gray scale X1 will be the VA that revises voltage relationship according to positive polarity gray scale-γ, and the voltage that is applied in the next 1H cycle will be the VB that revises voltage relationship according to negative polarity gray scale-γ.In this case, because VC is the center voltage of the common electric voltage of the level counter-rotating that provides from common electric voltage output circuit 4, so the effective voltage that imposes on the liquid crystal layer of liquid crystal board 5 will be | VA-VC|, | VB-VC| corresponds respectively to 1H cycle and next 1H cycle.Because it is to be symmetrical in a bit that gray scale-γ revises voltage relationship, shown in Fig. 4 B, (A, absolute value B) equate (A=B) mutually to these voltage differences.
Note, according to as described in the liquid crystal indicator of present embodiment, when the digital input signals of n position has been received, come gradation data of polarization counter-rotating by each of counter-rotating input data as top.Then according to above-mentioned normal voltage in the next 1H cycle, will be applied to the signal line of liquid crystal board 5 corresponding to the voltage of gradation data.As a result, can simplify circuit structure, no longer needing to prepare independent normal voltage generation circuit provides negative polarity gray scale-γ to revise voltage relationship.
As described in above-mentioned liquid crystal indicator of the present invention, realize that gray scale shows owing to revise voltage relationship according to gray scale-γ, and this gray scale-γ revises voltage relationship with respect to the central point between the highest gray shade scale and the minimum gray shade scale, and because the polarity of control circuit 1 by the input data of each horizontal synchronizing cycle that reverses produces gradation data, to impose on liquid crystal board 5 corresponding to the normal voltage of gradation data then, can simplify so produce the structure of the normal voltage generation circuit 6 of normal voltage.In addition, because constant between the cycle in 1H cycle and next 1H in the absolute voltage difference between the voltage that imposes on pixel capacitors and public electrode, can prolong the serviceable life of liquid crystal board 5, and its reliability also can strengthen.Then, because absolute voltage difference remains constant, can reduce flicker.
In addition, according to the driving method of the liquid crystal indicator of the embodiment of the invention, this gray scale-γ revises voltage relationship with respect to the central point between the highest gray shade scale and the minimum gray shade scale, and gray scale-γ revises voltage relationship and can represent with straight line.These horizontal driver 3 response input gray level data are revised the signal line that voltage imposes on liquid crystal board 5 with γ, revise voltage relationship so that satisfy gray scale-γ.Then, the absolute voltage difference that imposes on pixel capacitors and public electrode during 1H cycle and ensuing 1H cycle becomes equal (A=B).Therefore, can prolong the serviceable life of liquid crystal board 5 with and reliability can increase.In addition, because absolute voltage difference remains constant, can reduce flicker.
Various details second embodiment.Second embodiment has a feature, and its gray scale-γ revises institute's making alive transport property that voltage relationship has been considered liquid crystal layer.Because this circuit arrangement almost circuit with first embodiment shown in Figure 3 is identical, will not describe the configuration of this circuit in detail here.
Fig. 5 A is the curve map that gray scale-γ of using in the driving method according to liquid crystal indicator of the present invention revises voltage relationship; Fig. 5 B is presented at the oscillogram that imposes on the signal of liquid crystal board according to this driving method operating period.Shown in Fig. 5 A, in the present embodiment, this gray scale-γ revises voltage relationship with respect to the central point between the highest gray shade scale and the minimum gray shade scale, but represents (representing with the polygon line in this embodiment) without straight line.These horizontal driver 3 response input gray level data are revised voltage with γ and are imposed on liquid crystal board 5 to satisfy this relation.The resistance value of each ladder type resistance of the normal voltage generation circuit 6 by change constituting liquid crystal indicator shown in Figure 3 also can provide this relation.
With with the identical mode of first embodiment shown in Fig. 4 A, gray scale-γ that generation will apply to the input gray level data during the 1H cycle revises in the voltage, revise voltage relationship with reference to the positive polarity gray scale-γ that in Fig. 5 A, shows with solid line, revise in the voltage and produce the gray scale-γ that will apply during the next 1H cycle, the negative polarity gray scale-γ that shows with reference to dashed lines revises voltage relationship.For example, the voltage that applies for display gray scale X3 will be the VD that the positive polarity gray scale-γ according to the 1H cycle revises voltage relationship, and will be the VE that revises voltage relationship according to negative polarity gray scale-γ to the voltage in next 1H cycle.In this case, the effective voltage that imposes on the liquid crystal layer of liquid crystal board 5 will be | VD-VC|, | VE-VC| corresponds respectively to 1H cycle and next 1H cycle.Because it is the line symmetry that gray scale-γ revises voltage relationship, shown in Fig. 5 B, (D E) equates (D=E) mutually to the absolute value of these voltage differences.
Except the result that first embodiment obtains, this embodiment also has an advantage, promptly can realize considering the capable inversion driving of the voltage-transfer characteristic that applies of this liquid crystal layer, can realize the nature gray scale then on liquid crystal indicator.In addition, only indivedual resistances of the ladder type resistance by changing normal voltage generation circuit 6 just can provide above-mentioned advantage, and needn't increase independent circuit.Like this, reduced because the cost that the change on circuit design causes increases.
The present invention at length is described with different embodiment, to one skilled in the art, from the instruction of front, obviously can make some variations and modification, and can not depart from the scope of the present invention, therefore, in the claim that the present invention adds, covered all this variation and modifications, it is fallen within the true spirit of the present invention.For example, the gray scale of using in display gray scale-γ correction voltage relationship is not limited to Fig. 4 A and Fig. 5 A is described like that, but can represent those relations with other curve and polygon line rather than straight line, as long as just passable with respect to the central point between the highest gray shade scale and the minimum gray shade scale.
As mentioned above, liquid crystal indicator according to the present invention makes the circuit arrangement of simplifying and dwindling normal voltage generation circuit become possibility.Because switching is deleted from the switch of the high pressure that normal voltage generation circuit provides, therefore can simplify this circuit arrangement and reduced in size.Owing to be not operated in the switch of high pressure, can save the loss of power yet.In addition, in control circuit, revise voltage relationship, realize the row counter-rotating in each 1H cycle according to gray scale-γ with respect to the line symmetry at the center between the highest gray shade scale and minimum gray shade scale.As a result, when reversed polarity, the effective voltage that imposes on liquid crystal layer remains constant.Like this, just reduced flicker.
In addition, in driving method, revise voltage relationship, realize the row counter-rotating in each 1H cycle according to gray scale-γ with respect to the line symmetry at the center between the highest gray shade scale and minimum gray shade scale according to liquid crystal indicator of the present invention.As a result, when reversed polarity, the effective voltage that imposes on liquid crystal layer remains constant.Like this, just reduced flicker.
Claims (10)
1. liquid crystal indicator comprises:
Liquid crystal board has a plurality of trace wirings and a plurality of signal line;
Normal voltage generation circuit provides a plurality of normal voltages;
Vertical driver one by one scans the trace wiring of described liquid crystal board;
The a plurality of normal voltages that provided by described normal voltage generation circuit are provided horizontal driver, and grayscale voltage are provided for the signal line of described liquid crystal board; And
Control circuit, the polarity by each of counter-rotating input data produce gradation data and controlling level driver so that will impose on liquid crystal board corresponding to the normal voltage of described gradation data synchronizing cycle;
Wherein to revise voltage relationship be symmetrical with respect to the central point between the highest gray shade scale and the minimum gray shade scale to the gray scale gray-scale displayed-γ that is used for that is used by described control circuit.
2. liquid crystal indicator as claimed in claim 1, wherein said gray scale-γ are revised voltage relationship and are represented with straight line, and the gradation data of described horizontal driver response input is revised voltage with γ and imposed on liquid crystal board to satisfy this relation.
3. liquid crystal indicator as claimed in claim 1, wherein said gray scale-γ are revised voltage relationship and are represented with non-rectilinear, and the gradation data of described horizontal driver response input is revised voltage with γ and imposed on described liquid crystal board to satisfy this relation.
4. liquid crystal indicator as claimed in claim 3, wherein said non-rectilinear are curve or polygonal line.
5. as the described liquid crystal indicator of any claim in the claim 1 to 4, wherein said input data are numerical datas, and described control circuit is by each gradation data that comes polarization to reverse in the described numerical data of reversing.
6. as the described liquid crystal indicator of any claim in the claim 1 to 4, wherein said normal voltage generation circuit has ladder type resistance, and determines that by the resistance value that described ladder type resistance is set described gray scale-γ revises voltage relationship.
7. the driving method of a liquid crystal indicator comprises the following steps:
The horizontal driver of a plurality of normal voltages to liquid crystal board is provided; And
With the polarity of vertical driver, scan liquid crystal board by the input data that are used for the gray scale demonstration of each row that reverses;
Wherein to revise voltage relationship be with respect to the central point between the highest gray shade scale and the minimum gray shade scale to the described gray scale of using in gray scale shows-γ.
8. the driving method of liquid crystal indicator as claimed in claim 7, wherein said gray scale-γ are revised voltage relationship and are represented with straight line, and the gradation data of described horizontal driver response input is revised voltage with γ and imposed on described liquid crystal board to satisfy this relation.
9. the driving method of liquid crystal indicator as claimed in claim 7, wherein said gray scale-γ are revised voltage relationship and are represented with non-rectilinear, and described horizontal driver response input gray level data are revised voltage with γ and imposed on described liquid crystal board to satisfy this relation.
10. the driving method of liquid crystal indicator as claimed in claim 9, wherein said non-rectilinear is curve or polygonal line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02140520 CN1236416C (en) | 2002-07-02 | 2002-07-02 | LCD device and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02140520 CN1236416C (en) | 2002-07-02 | 2002-07-02 | LCD device and driving method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1466122A true CN1466122A (en) | 2004-01-07 |
| CN1236416C CN1236416C (en) | 2006-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02140520 Expired - Fee Related CN1236416C (en) | 2002-07-02 | 2002-07-02 | LCD device and driving method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN1236416C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201214A (en) * | 2011-04-12 | 2011-09-28 | 友达光电股份有限公司 | Scanning line driving device of liquid crystal display |
| CN104036742A (en) * | 2014-05-26 | 2014-09-10 | 京东方科技集团股份有限公司 | Gamma reference voltage generation circuit, V-T (Voltage-Transmittance) curve test method and display device |
-
2002
- 2002-07-02 CN CN 02140520 patent/CN1236416C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201214A (en) * | 2011-04-12 | 2011-09-28 | 友达光电股份有限公司 | Scanning line driving device of liquid crystal display |
| CN104036742A (en) * | 2014-05-26 | 2014-09-10 | 京东方科技集团股份有限公司 | Gamma reference voltage generation circuit, V-T (Voltage-Transmittance) curve test method and display device |
| US9437145B2 (en) | 2014-05-26 | 2016-09-06 | Boe Technology Group Co., Ltd. | Gamma reference voltage generating circuit, method for measuring voltage-transmission curve and display device |
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| Publication number | Publication date |
|---|---|
| CN1236416C (en) | 2006-01-11 |
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