CN100489957C - Display driver circuit, display device using the same and method therefor - Google Patents
Display driver circuit, display device using the same and method therefor Download PDFInfo
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- CN100489957C CN100489957C CNB2003101196355A CN200310119635A CN100489957C CN 100489957 C CN100489957 C CN 100489957C CN B2003101196355 A CNB2003101196355 A CN B2003101196355A CN 200310119635 A CN200310119635 A CN 200310119635A CN 100489957 C CN100489957 C CN 100489957C
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- 238000000034 method Methods 0.000 title claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 101150098161 APD1 gene Proteins 0.000 description 2
- 101100379208 Arabidopsis thaliana APD2 gene Proteins 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
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Abstract
The display driver circuit includes color correcting unit and driver unit. The color correcting unit receives one digital video signal and one polar signal and outputs one color correcting video signal based on the digital video signal and the polar signal, and the polar signal shows the driving polarity, positive or negative. The driver unit receives the color correcting video signal and converts it into one output analog drive voltage. The display device with the display driver circuit receives the analog drive voltage to show picture in the display panel.
Description
Technical field
The present invention relates to a kind of display device, particularly relate to a kind of display driver circuit and method thereof.
Background technology
The interface of display device in order to link up as people and computing machine, it is the image that the digital video of computing machine is converted to the energy identification of human eye institute.Fig. 1 is the calcspar of known display device.Display device 100 is that example is done explanation with the liquid crystal indicator at this.Display device 100 comprises display driver circuit 110 and display panel 180.Display driver circuit 110 comprises color revisal (color correction) unit 120, data reversal (data inversion) unit 140 and driver element 160.Color correcting unit 120 receives a digital video (digital video signal) PD, and digital video PD is carried out the color revisal, then exports color correcting video signal PD ' to data reversal unit 140.Data reversal unit 140 selectivity counter-rotating or keep this color correcting video signal PD ', output polarity video signal PD according to this then ".Driver element 160 receiving polarity video signal PD " after, with the polarity video signal PD of numeral " carry out digital-to-analogue conversionization after, output analog drive voltage Vpd.Then, display panel 180 display frame according to analog drive voltage Vpd.
The color revisal can have preferable color in order to adjust the characteristic of input video signal when making it to show on display panel.With the LCD screen is example, the general GTG value that liquid crystal panel presented and the voltage of driving are not linear, therefore must correct with the color revisal, this nonlinear relationship curve then claims color revisal curve (color corrected curve) or character used in proper names and in rendering some foreign names Maqu line (gamma curve).Color revisal (colorcorrection) claims character used in proper names and in rendering some foreign names agate revisal (gamma correction) again.
Fig. 2 is known color revisal curve synoptic diagram.Transverse axis is the digital video PD of input, and the longitudinal axis is the color correcting video signal PD ' of output.Digital video PD produces corresponding color correcting video signal PD ' according to this color revisal curve, and then exports analog drive voltage Vpd via driver element 160, so that display panel 180 can show correct picture.
The liquid crystal molecule of liquid crystal indicator is if be in the driving voltage of same polarity for a long time, and liquid crystal molecule will electrically be polarized easily.For solving this polarization phenomena, known technology is alternately to drive liquid crystal molecule in the display driver process with the driving voltage of positive polarity and negative polarity.Data reversal unit 140 promptly is in order to decision polarity video signal PD " the driving polarity (driving polarity) of representative.The polarity video signal PD of representing positive polarity " after driver element 160 is handled, the analog drive voltage Vpd of output representing positive polarity.The polarity video signal PD of representing negative polarity " after driver element 160 is handled, the analog drive voltage Vpd of output representing negative polarity.
Summary of the invention
In view of this, purpose of the present invention is exactly a kind of display driver circuit to be provided and to use its display device and method thereof.
According to purpose of the present invention, a kind of display driver circuit has been proposed, it comprises a color correcting unit and a driver element.Color correcting unit produces a color correcting video signal according to a digital video and a polar signal with lookup table mode.Driver element carries out digital-to-analogue conversion with color correcting video signal, and exports an analog drive voltage.Wherein the driving polarity of analog drive voltage is corresponding to polar signal.
According to another object of the present invention, a kind of display device has been proposed, show a picture according to a digital video, it comprises color correcting unit, driver element and display panel.Color correcting unit according to a digital video and a polar signal, produces a color correcting video signal with lookup table mode.Driver element carries out digital-to-analogue conversion with color correcting video signal, and exports an analog drive voltage.Display panel is according to the analog drive voltage show image.Wherein, display panel comprises a display panels, and analog drive voltage puts on the driving polarity of liquid crystal of liquid crystal panel corresponding to polar signal.
According to another object of the present invention, a kind of method of driving one liquid crystal display displays image has been proposed, may further comprise the steps: receive a digital video and a polar signal; According to digital video and polar signal, produce a color correcting video signal with lookup table mode; The conversioning colour correcting video signal becomes an analog drive voltage; And, drive this LCD with analog drive voltage; Wherein the driving polarity of analog drive voltage is corresponding to polar signal.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, four embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 is the calcspar of known display device;
Fig. 2 is known color revisal curve synoptic diagram;
Fig. 3 is a kind of display device calcspar according to first embodiment of the invention;
Fig. 4 is the color revisal curve map of polarized color correcting unit;
Fig. 5 is a kind of display device calcspar according to second embodiment of the invention;
Fig. 6 is a kind of display device calcspar according to third embodiment of the invention; With
Fig. 7 is a kind of display device calcspar according to fourth embodiment of the invention.
The drawing reference numeral explanation
100,300,600,700: display device
110: display driver circuit
120: color correcting unit
140,630: the data reversal unit
160,360: driver element
180,380: display panel
310,670,770: display driver circuit
320: color correcting unit
540: timing control unit
610: delete and cut the unit
640,740: select circuit
720a: first color correcting unit
720b: second color correcting unit
Embodiment
Please refer to Fig. 3, it shows a kind of and display device 300 calcspars according to first embodiment of the invention.Display driver circuit 310 receives a digital video (digital video signal) APD and produces driving voltage AVpd display frame with the pixel on the driving display panel 380 according to this.Display driver circuit 310 comprises color correcting unit 320 and driver element 360.Color correcting unit 320 receives digital video APD and polar signal Sp, and carries out the color revisal according to digital video APD and polar signal Sp.The result of color correcting unit 320 after with the color revisal exports color correcting video signal (the colorcorrected video signal) APD ' of numeral.Wherein, polar signal Sp is in order to the driving polarity of the analog drive voltage AVpd that represents driver element 160 output.The so-called herein positive and negative driving voltage Avpd that do not represent that drives polarity is positive voltage or negative voltage, and is meant that driving voltage Avpd acts on the polarity of voltage that is caused of liquid crystal molecule two electrodes of display panel.Driver element 360 and color correcting unit 320 electric property couplings in order to receiving color correcting video signal PD ', and carry out digital-to-analogue conversion with color correcting video signal PD ', and outputting drive voltage AVpd.
Digital video APD also can remove at least one least significant bit (LSB) (least significant bit) input signal of polar signal Sp as color correcting unit 320 of arranging in pairs or groups then.Digital video APD[7:0 with 8] be example, generally be to reduce by two least significant bit (LSB)s, make it to become APD[5:0], and then with 1 polar signal Sp collocation, be combined into the input signal of color correcting unit 320.Wherein, polar signal Sp is 0 expression positive polarity, is 1 expression negative polarity, and vice versa.In addition, color correcting unit 320 1 embodiment produce color correcting video signal APD ' with lookup table mode.Color correcting unit 320 comprises the table of comparisons that digital video APD, polar signal Sp and color correcting video signal APD ' form.
Fig. 4 is the color revisal curve map of color correcting unit 320.Transverse axis is polar signal Sp and digital video APD[5:0] composite signal XCode, that is when Sp was 0 representing positive polarity, its composite signal XCode scope was between 0-63, with digital video APD[5:0] value identical; And when Sp was 1 representing negative polarity, its composite signal XCode scope was digital video APD[5:0 between 64-127] value add side-play amount 64.The longitudinal axis is color correcting video signal APD ', and it is 8 bit data.If composite signal XCode drops between the 0-63, then color correcting unit 320 produces color correcting video signal APD ' accordingly according to positive color revisal curve L1; If composite signal XCode drops between the 64-127, then color correcting unit 320 produces color correcting video signal APD ' accordingly according to negative color revisal curve L2.In addition, because the characteristic of liquid crystal itself, just color revisal curve L1 and negative color revisal curve L2 not necessarily present symmetric relation, and for example Fig. 4 promptly is a color revisal curve map of not having a symmetric relation.The transformational relation of composite signal XCode shown in Figure 4 and color correcting video signal APD ' is only given an example for one embodiment of the invention, polar signal Sp can be used as arbitrary bit code of composite signal Xcode in the practical application, and composite signal XCode will be different with the transformational relation of color correcting video signal APD '.Therefore, the color correcting unit 320 according to one embodiment of the invention comprises the table of comparisons that composite signal Xcode and color correcting video signal APD ' form.
Please refer to Fig. 5, it shows a kind of display device 500 calcspars according to second embodiment of the invention.For simplifying the explanation of the embodiment of the invention, identical assembly is represented with same numeral, repeats no more.The difference of the second embodiment of the invention and first embodiment is, display device 500 also comprises a sequential control module (timing controll unit) 540, and it provides sequential signal in case of necessity with the operation with display panel 380 of control color correcting unit 320, driver element 360.According to one embodiment of the invention, timing control unit 540 can be integrated in the integrated circuit with color correcting unit 320.According to another embodiment of the present invention, color correcting unit 320, driver element 360 can be integrated in the integrated circuit with timing control unit 540.Perhaps, color correcting unit 320 also can be integrated in the integrated circuit with timing control unit 540.
Please refer to Fig. 6, it shows a kind of display device 600 calcspars according to third embodiment of the invention.For simplifying the explanation of the embodiment of the invention, identical assembly is represented with same numeral, repeats no more.Display driver circuit 670 comprises deleting cuts out unit 610, color correcting unit 320, data reversal unit 630, selection circuit 640 and driver element 360.Delete and cut out unit 610 reception digital video OPD, be that at least one least significant bit (LSB) (least significant bit) is removed, and produce the digital video BPD delete after the sanction, for example with 8 digital video OPD[7:0] be example, generally be to reduce by two least significant bit (LSB)s, make it to become to delete and cut out back digital video BPD[5:0].Color correcting unit 320 receives digital video BPD and polar signal Sp, after the color revisal of the circumstances in which people get things ready for a trip of going forward side by side, and output color correcting video signal BPD '.
Selecting circuit 640 is to receive color correcting video signal BPD ' and polarity video signal OPD ', and according to system requirements select one be output as show video signal BPD " to driver element 360.Driver element 360 will be according to showing video signal BPD " produce analog drive voltage BVpd.Wherein, select circuit 640 to comprise a multiplexer.
Please refer to Fig. 7, it shows a kind of display device 700 calcspars according to fourth embodiment of the invention.For simplifying the explanation of the embodiment of the invention, identical assembly is represented with same numeral, repeats no more.Display driver circuit 770 comprises the first color correcting unit 720a, the second color correcting unit 720b, selects circuit 740 and driver element 360.The first color correcting unit 720a is for storing table look-up (the look-up table) of the revisal of positive polarity color; The second color correcting unit 720a is for storing table look-up (the look-up table) of the revisal of negative polarity color.Digital video APD carries out the revisal of positive polarity color via the first color correcting unit 720a, output cathode color correcting video signal APD1.Digital video APD carries out the revisal of negative polarity color via the second color correcting unit 720b, output negative pole color correcting video signal APD2.Select circuit 740 according to polar signal Sp, select an output cathode color correcting video signal APD1 or negative polarity color correcting video signal APD2, as color correcting video signal APD '.Therefore, according to fourth embodiment of the invention, can provide different color revisals according to the opposed polarity demand, and not need any digital video is carried out data reversal or reversal of poles program.
The color correcting unit that one embodiment of the invention is separated tradition and the function of data reversal unit are integrated into only needs an operation of tabling look-up promptly can finish the function of the color revisal of the digital video of representing opposed polarity simultaneously, therefore design that can facilitating chip, and reduce because of dwindling of chip area makes manufacturing cost.
The color correcting unit of one embodiment of the invention more can be carried out different digital color revisals at digital video.With LCD screen, because the GTG value and the driving voltage of its pixel are not merely linear, so digital video need carry out the color revisal to obtain correct driving voltage.Give the LCD screen opposed polarity in theory but during the driving voltage of identical size, the GTG value that is showed is identical; But the driving voltage of the positive polarity of practically identical size and the GTG value that the driving voltage of negative polarity shows still have a little different.Traditional drive IC is owing to just polarizing after the color revisal, so can't carry out different color revisals at the video signal of positive-negative polarity.The present invention has asymmetrical positive color revisal curve L1 and negative color revisal curve L2, can be to the video signal that has polarity information and carry out the color revisal, thereby can design asymmetrical positive color revisal curve L1 and negative color revisal curve L2 at the characteristic of display panel, to improve the quality of the picture that display device was presented.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; those skilled in the art under the premise without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, so protection scope of the present invention is looked accompanying Claim and is as the criterion.
Claims (9)
1. display driver circuit comprises:
One deletes a section unit, and a digital video is removed a least significant bit (LSB) at least, produces one and deletes a section back digital video;
One color correcting unit is deleted section a back digital video and a polar signal according to this, produces a corresponding color correcting video signal with lookup table mode;
One data reversal unit, according to this polar signal, selectivity is reversed or is kept this digital video, exports a polarity and handles the back digital video;
One selects circuit, receives this color correcting video signal and polarity and handles the back digital video and select an output; And
One driver element carries out digital-to-analogue conversion with the output signal of this selection circuit.
2. display driver circuit as claimed in claim 1, wherein this driver element is exported an analog drive voltage.
3. display driver circuit as claimed in claim 2, wherein the driving polarity of this analog drive voltage is corresponding to this polar signal.
4. display driver circuit as claimed in claim 1 also comprises a sequential control module, provides this display driver circuit required clock signal.
5. display driver circuit as claimed in claim 1, wherein this selection circuit comprises a multiplexer.
6. display device comprises:
One deletes a section unit, and a digital video is removed a least significant bit (LSB) at least, produces one and deletes a section back digital video;
One color correcting unit is deleted section a back digital video and a polar signal according to this, produces a corresponding color correcting video signal with lookup table mode;
One data reversal unit, according to this polar signal, selectivity is reversed or is kept this digital video, exports a polarity and handles the back digital video;
One selects circuit, receives this color correcting video signal and polarity and handles the back digital video and select an output;
One driver element carries out digital-to-analogue conversion with the output signal of this selection circuit, and exports an analog drive voltage; And
One display panel is according to this analog drive voltage show image.
7. display device as claimed in claim 6, wherein the driving polarity of this analog drive voltage is corresponding to this polar signal.
8. display device as claimed in claim 6, wherein this display panel comprises a display panels, the driving polarity of the liquid crystal that puts on this liquid crystal panel of this analog drive voltage is corresponding to this polar signal.
9. method that drives a liquid crystal display displays image may further comprise the steps:
Receive a digital video and a polar signal;
Make up a digital video and a polar signal and form a composite signal, produce a corresponding color correcting video signal with lookup table mode according to this composite signal;
Change this color correcting video signal and become an analog drive voltage; And
Drive this LCD with this analog drive voltage; Wherein the driving polarity of this analog drive voltage is corresponding to this polar signal,
This method also comprises and also comprises combination this digital video and this polar signal, produces a composite signal,
Wherein the required comparison list system of this step of tabling look-up is made up of this composite signal and this color correcting video signal,
Wherein this combination step comprises at least one least significant bit (LSB) of removing this digital video.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101196355A CN100489957C (en) | 2003-11-27 | 2003-11-27 | Display driver circuit, display device using the same and method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101196355A CN100489957C (en) | 2003-11-27 | 2003-11-27 | Display driver circuit, display device using the same and method therefor |
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| CN1622186A CN1622186A (en) | 2005-06-01 |
| CN100489957C true CN100489957C (en) | 2009-05-20 |
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| US20080165171A1 (en) | 2007-01-09 | 2008-07-10 | Himax Technologies Limited | Display Driving Circuit and Method Thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001201732A (en) * | 2000-01-21 | 2001-07-27 | Victor Co Of Japan Ltd | Liquid crystal display device |
| CN1381035A (en) * | 2000-03-22 | 2002-11-20 | 皇家菲利浦电子有限公司 | Controller circuit for liquid crystal matrix display devices |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001201732A (en) * | 2000-01-21 | 2001-07-27 | Victor Co Of Japan Ltd | Liquid crystal display device |
| CN1381035A (en) * | 2000-03-22 | 2002-11-20 | 皇家菲利浦电子有限公司 | Controller circuit for liquid crystal matrix display devices |
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| CN1622186A (en) | 2005-06-01 |
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