CN102663974A - Stereoscopic display device and driving method thereof - Google Patents
Stereoscopic display device and driving method thereof Download PDFInfo
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- CN102663974A CN102663974A CN2012101362621A CN201210136262A CN102663974A CN 102663974 A CN102663974 A CN 102663974A CN 2012101362621 A CN2012101362621 A CN 2012101362621A CN 201210136262 A CN201210136262 A CN 201210136262A CN 102663974 A CN102663974 A CN 102663974A
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Abstract
The invention relates to a stereoscopic display device and a driving method thereof. The stereoscopic display device employs a double frame inversion driving mode. The stereoscopic display device comprises a display panel, a time sequence controller, a gamma voltage generator and at least one source driving circuit, wherein the display panel is provided with a plurality of pixels. The time sequence controller provides two groups of different gamma voltages for the gamma voltage generator, so the charging situations of all pixels during frame inversion tend to be accordant. By the invention, the problem of ghost phenomenon caused by insufficient charging during double frame inversion driving can be solved.
Description
Technical field
The invention relates to a kind of 3 d display device, particularly relevant a kind of 3 d display device and driving method thereof.
Background technology
Therefore 3 d display device needs to use the frame rate (double frame rate) of twice by alternately providing left-eye images and right-eye image to form stereopsis.See also Fig. 1, it is the relation of picture frame and polarity when illustrating the convention 3 d display device and adopting free hand drawing frame conversion (1 frame inversion) to drive.The conversion of free hand drawing frame is meant each picture frame reverse of polarity once.
Picture frame N and picture frame N+2 show left-eye images, and picture frame N+1 and picture frame N+3 show right-eye image.In the left-eye images of picture frame N and picture frame N+2, the pixel voltages of same picture element is an identical polar, and in the right-eye image of picture frame N+1 and picture frame N+3, the pixel voltages of same picture element also is an identical polar.Because the image with a glance all is an identical polar, and the speckle phenomenon can take place.
See also Fig. 2, it is the oscillogram that illustrates pixel voltages and common electric voltage.Suppose common electric voltage V
COMIt is 6 volts, as gate forward voltage V
GDuring gate line of conducting, the pixel voltages V of the left-eye images of picture frame N
PIt is 11 volts, with common electric voltage V
COMVoltage difference be 5 volts, the pixel voltages V of the right-eye image of picture frame N+1
PIt is 5 volts, with common electric voltage V
COMVoltage difference be 1 volt.Because two voltage difference additions are not equal to zero (promptly uneven), can produce the dent phenomenon when causing picture frame to switch.
For improving the problems referred to above, see also Fig. 3 and Fig. 4, Fig. 3 is the relation that illustrates picture frame and polarity when adopting digraph frame conversion (2 frame inversion) to drive, Fig. 4 is the oscillogram that illustrates pixel voltages and common electric voltage.Can know from Fig. 3; The conversion of digraph frame is meant per two picture frame reverses of polarity once, so in the left-eye images of picture frame N and picture frame N+2, the pixel voltages of same picture element is an opposite polarity; And in the right-eye image of picture frame N+1 and picture frame N+3, the pixel voltages of same picture element also is an opposite polarity.Because the image with a glance all is an opposite polarity, the speckle phenomenon in the time of therefore can improving the free hand drawing frame conversion driving of Fig. 1.
As shown in Figure 4, suppose common electric voltage V
COMIt is 6 volts, as gate forward voltage V
GDuring gate line of conducting, the pixel voltages V of the left-eye images of picture frame N
PIt is 11 volts, with common electric voltage V
COMVoltage difference be 5 volts, the pixel voltages V of the right-eye image of picture frame N+1
PIt is 7 volts, with common electric voltage V
COMVoltage difference be 1 volt, the pixel voltages V of the left-eye images of picture frame N+2
PIt is 1 volt, with common electric voltage V
COMVoltage difference be 5 volts, the pixel voltages V of the right-eye image of picture frame N+3
PIt is 5 volts, with common electric voltage V
COMVoltage difference be 1 volt.Because four voltage difference additions are similar to zero (being balance), the dent phenomenon the when picture frame that therefore can improve Fig. 2 switches.
See also Fig. 5 A to Fig. 5 D, Fig. 5 A and Fig. 5 B are the pixel voltages and the oscillogram of common electric voltage that illustrates GTG 128 and GTG 32 respectively, and Fig. 5 C and Fig. 5 D are pixel voltages and the oscillograms of common electric voltage when illustrating GTG respectively and changing.
In Fig. 5 A, picture frame N and picture frame N+1 are that positive polarity (is higher than common electric voltage V
COMBe positive polarity) drive and GTG is 128 the pixel voltages V of the left-eye images of picture frame N in theory
PPixel voltages V with the right-eye image of picture frame N+1
PShould all charge to voltage V1, however the pixel voltages V of the left-eye images of picture frame N in fact
POnly can charge to V1-, (be lower than common electric voltage V because picture frame N is a negative polarity from last picture frame
COMBe negative polarity) drive and to be converted to positive polarity and to drive, the polarity difference causes undercharge.And picture frame N+1 and last picture frame (being picture frame N) all to be positive polarity drive, polarity is identical and can charge to voltage V1.The rest may be inferred, the pixel voltages V of the left-eye images of picture frame N+2
POnly can charge to voltage V2-, picture frame N+3 then can charge to V2.
Fig. 5 B is the example of GTG 32, the pixel voltages V of the left-eye images of picture frame N
POnly can charge to voltage V3-, picture frame N+1 then can charge to V3.The pixel voltages V of the left-eye images of picture frame N+2
POnly can charge to voltage V4-, picture frame N+3 then can charge to V4, and the problem of Fig. 5 A is arranged equally.
In Fig. 5 C, as the pixel voltages V of the left-eye images of picture frame N
PCorrespond to GTG 32 (the initial GTG of left eye) and the pixel voltages of the right-eye image of picture frame N+1 when corresponding to GTG 128 (the initial GTG of right eye), the pixel voltages V of the left-eye images of picture frame N
PWith common electric voltage V
COMVoltage difference deduct the pixel voltages V of the right-eye image of picture frame N+1
PWith common electric voltage V
COMVoltage difference as shown in the formula:
∣V3-－Vcom∣－∣V1－Vcom∣=?A
In Fig. 5 D, as the pixel voltages V of the right-eye image of picture frame N+1
PCorrespond to GTG 32 (target gray scale of right eye) and the pixel voltages V of the left-eye images of picture frame N+2
PWhen corresponding to GTG 128 (target gray scale of left eye), the pixel voltages V of the left-eye images of picture frame N+2
PWith common electric voltage V
COMVoltage difference deduct the pixel voltages V of the right-eye image of picture frame N+1
PWith common electric voltage V
COMVoltage difference as shown in the formula:
∣V4－Vcom∣－∣Vcom－V2-∣=?B
Can know A ≠ B from Fig. 5 A and Fig. 5 B, make left-eye images and right-eye image share same table (the OverDrive table that overdrives; Ghost (crosstalk) phenomenon can take place in the time of OD table).
Therefore undercharge in the time of need be to above-mentioned employing digraph frame conversion driving and problem that the ghost phenomenon takes place proposes a solution.
Summary of the invention
A purpose of the present invention is to provide a kind of 3 d display device and driving method thereof, undercharge when it can improve digraph frame conversion driving and the problem of ghost phenomenon takes place.
For achieving the above object, characteristics according to the present invention provide a kind of 3 d display device, and it is to adopt digraph frame conversion driving.This 3 d display device comprises a display panel, time schedule controller, a gamma voltage generator and at least one source electrode drive circuit.This display panel has a plurality of picture elements.This time schedule controller provides an image data and one first group of gamma voltage is provided or one second group of gamma voltage.Under same gray level, the voltage difference of this second a group of gamma voltage and a common electric voltage is the voltage difference greater than this first group of gamma voltage and this common electric voltage.This first group of gamma voltage or this second group of gamma voltage are selected and exported to this gamma voltage generator according to each these picture element.This first group of gamma voltage that this source electrode drive circuit is exported according to this image data and this gamma voltage generator or this second group of gamma voltage are to drive each these picture element.When each these picture element is when driving for identical polar at a last picture frame and a present picture frame, this time schedule controller provides this first group of gamma voltage to this gamma voltage generator.When each these picture element is when driving for opposed polarity at this last picture frame and this present picture frame, this time schedule controller provides this second group of gamma voltage to this gamma voltage generator.
For achieving the above object, another characteristics according to the present invention provide a kind of driving method of 3 d display device, and this 3 d display device is to adopt digraph frame conversion driving and comprise a display panel.This display panel has a plurality of picture elements.This method comprises: an image data is provided; When each these picture element is when driving for identical polar at a last picture frame and a present picture frame; One first group of gamma voltage is provided; When each these picture element is when driving for opposed polarity at this last picture frame and this present picture frame; One second group of gamma voltage is provided, and under same gray level, the voltage difference of this second a group of gamma voltage and a common electric voltage is the voltage difference greater than this first group of gamma voltage and this common electric voltage; Select and export this first group of gamma voltage or this second group of gamma voltage according to each these picture element; And according to this image data and this first group of gamma voltage or this second group of gamma voltage to drive each picture element.
Time schedule controller of the present invention provides two groups of different gamma voltages to gamma voltage generators so that the charge condition of each picture element when picture frame switches reaches unanimity.
Description of drawings
Fig. 1 is the relation of picture frame and polarity when illustrating the convention 3 d display device and adopting free hand drawing frame conversion driving;
Fig. 2 is the oscillogram that illustrates pixel voltages and common electric voltage when adopting free hand drawing frame conversion driving;
Fig. 3 is the relation that illustrates picture frame and polarity when adopting digraph frame conversion driving;
Fig. 4 is the oscillogram that illustrates pixel voltages and common electric voltage when adopting digraph frame conversion driving;
Fig. 5 A and Fig. 5 B illustrate GTG 128 and the pixel voltages of GTG 32 and the oscillogram of common electric voltage respectively;
Fig. 5 C and Fig. 5 D illustrate the pixel voltages in GTG when conversion and the oscillogram of common electric voltage respectively;
Fig. 6 is the 3 d display device that illustrates one preferred embodiment according to the present invention;
Fig. 7 illustrates according to first group of gamma voltage of the present invention and second group of gamma voltage curve map;
Fig. 8 A and Fig. 8 B illustrate GTG 128 and the pixel voltages of GTG 32 and the oscillogram of common electric voltage after the embodiment of the present invention respectively;
Fig. 8 C and Fig. 8 D are pixel voltages and the oscillograms of common electric voltage when illustrating GTG conversion after the embodiment of the present invention respectively; And
Fig. 9 is the driving method that illustrates according to 3 d display device of the present invention.
[primary clustering symbol description]
600 display panels
602 picture elements
610 gamma voltage generators
620 time schedule controllers
630 source electrode drive circuits
First group of gamma voltage curve of C1
Second group of gamma voltage curve of C2
N, N+1, N+2, N+3 picture frame
SI system input signal
V1, V1-, V2, V2-, V3, V3-, V4, V4-voltage
V
11-V
1NFirst group of gamma voltage
V
21-V
2NSecond group of gamma voltage
V
COMCommon electric voltage
V
GThe gate forward voltage
V
PPixel voltages
The S900-S930 step.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated.
See also Fig. 6, it is the 3 d display device that illustrates one preferred embodiment according to the present invention.
3 d display device comprises a display panel 600, a gamma voltage (gamma voltage) generator 610, time schedule controller 620 and at least one source electrode drive circuit 630.
3 d display device of the present invention is to adopt the digraph frame to change and fixedly driving under the frame rate.Display panel 600 is used for Alternation Display one left-eye images and a right-eye image and has a plurality of picture elements (figure is with 602 representatives of a picture element).Time schedule controller 620 receives an input signal SI of system, and one image data to source electrode drive circuit 630 is provided and one first group of gamma voltage V is provided according to the input signal SI of system
11-V
1NOr one second group of gamma voltage V
21-V
2NTo gamma voltage generator 610.Image data comprises that each picture element 602 desire shows the data of GTG.
The input signal SI of system is to be a low voltage differential signal (Low Voltage Differential Signal; LVDS) or an embedded display port (embedded Display Port; EDP) signal.
In present embodiment, gamma voltage generator 610 is a programmable integrated circuit, and time schedule controller 620 is to see through an internal integration circuit (Inter Integrated Circuit; I2C) interface is with first group of gamma voltage V
11-V
1NOr second group of gamma voltage V
21-V
2NWrite gamma voltage generator 610, first group of gamma voltage V selected and exported to gamma voltage generator 610
11-V
1NOr second group of gamma voltage V
21-V
2NTo source electrode drive circuit 630, wherein N is a positive integer.
First group of gamma voltage V that image data that source electrode drive circuit 630 is transmitted according to time schedule controller 620 and gamma voltage generator 610 are exported
11-V
1NOr second group of gamma voltage V
21-V
2NTo drive each picture element 602.
See also Fig. 6 and Fig. 7, Fig. 7 illustrates according to first group of gamma voltage of the present invention and second group of gamma voltage curve map.First group of gamma voltage curve C 1 and second group of gamma voltage curve C 2 respectively have 14 gamma voltages; Numbering 1 to 7 corresponds to different GTGs respectively; The same gray level of same group of gamma voltage curve (C1 or C2) (being identical numbering) corresponds to two gamma voltages, greater than common electric voltage V
COMThe person drives for positive polarity, less than common electric voltage V
COMThe person drives for negative polarity.From figure, can know, under the same gray level (being identical numbering), the gamma voltage of second group of gamma voltage curve C 2 and common electric voltage V
COMVoltage difference be gamma voltage and common electric voltage V greater than first group of gamma voltage curve C 1
COMVoltage difference.
When each these picture element is that time schedule controller 620 provides second group of gamma voltage V when causing undercharge for the opposed polarity driving at a last picture frame and a present picture frame
21-V
2N(i.e. each gamma voltage of second group of gamma voltage curve C 2) is to gamma voltage generator 610; By providing bigger gamma voltage with the not enough situation of compensating charge; When each these picture element is when driving for identical polar at this last picture frame and this present picture frame, time schedule controller 620 provides first group of gamma voltage V
11-V
1N(i.e. each gamma voltage of first group of gamma voltage curve C 1) is to gamma voltage generator 610.
Be noted that first group of gamma voltage curve C 1 and second group of gamma voltage curve C 2 are to be got by experiment to the characteristic of display panel 600.
See also Fig. 6, Fig. 7 and Fig. 8 A to Fig. 8 D; Fig. 8 A and Fig. 8 B are the pixel voltages and the oscillogram of common electric voltage that illustrates GTG 128 and GTG 32 after the embodiment of the present invention respectively, and Fig. 8 C and Fig. 8 D are pixel voltages and the oscillograms of common electric voltage that illustrates respectively when GTG is changed after the embodiment of the present invention.
In Fig. 8 A, picture frame N is that positive polarity drives, and its last picture frame is that negative polarity drives, because opposed polarity drives, therefore when picture frame N, time schedule controller 620 provides second group of gamma voltage V
21-V
2NTo gamma voltage generator 610, picture frame N+1 and picture frame N are that identical polar drives (i.e. the gamma voltage of second group of gamma voltage curve C 2), and therefore when picture frame N+1, time schedule controller 620 provides first group of gamma voltage V
11-V
1N(i.e. the gamma voltage of first group of gamma voltage curve C 1) to gamma voltage generator 610, makes the pixel voltages V of picture frame N and picture frame N+1
PCharging can reach unanimity, promptly can both charge to voltage V1.The rest may be inferred, and picture frame N+2 and picture frame N+1 are that opposed polarity drives, and therefore when picture frame N+2, time schedule controller 620 provides second group of gamma voltage V
21-V
2N(i.e. the gamma voltage of second group of gamma voltage curve C 2) is to gamma voltage generator 610, and picture frame N+3 and picture frame N+2 are the identical polar driving, and therefore when picture frame N+3, time schedule controller 620 provides first group of gamma voltage V
11-V
1N(i.e. each gamma voltage of first group of gamma voltage curve C 1) to gamma voltage generator 610, makes the pixel voltages V of picture frame N+2 and picture frame N+3
PCharging reach unanimity, promptly can both charge to voltage V2.
Fig. 8 B is the example of GTG 32, by two groups of different gamma voltages, and the pixel voltages V of picture frame N and picture frame N+1
PCan both charge to voltage V3, the pixel voltages V of picture frame N+2 and picture frame N+3
PCan both charge to V4, its principle is identical with Fig. 8 A, and this does not add to give unnecessary details.
In Fig. 8 C, when picture frame N is GTG 32 (the initial GTG of left-eye images) and picture frame N+1 when being GTG 128 (the initial GTG of right-eye image), the pixel voltages V of the left-eye images of picture frame N
PWith common electric voltage V
COMVoltage difference deduct the pixel voltages and the common electric voltage V of the right-eye image of picture frame N+1
COMVoltage difference as shown in the formula:
∣V3－Vcom∣－∣V1－Vcom∣=?C
In Fig. 8 D, as the pixel voltages V of the right-eye image of picture frame N+1
PCorrespond to GTG 32 (target gray scale of right eye) and the pixel voltages V of the left-eye images of picture frame N+2
PWhen corresponding to GTG 128 (target gray scale of left eye), the pixel voltages V of the left-eye images of picture frame N+2
PWith common electric voltage V
COMVoltage difference deduct the pixel voltages V of the right-eye image of picture frame N+1
PWith common electric voltage V
COMVoltage difference as shown in the formula:
∣V4－Vcom∣－∣Vcom－V2∣=?D
Can know C=D from Fig. 8 A and Fig. 8 B, make left-eye images and right-eye image can share same table (the OverDrive table that overdrives; OD table) time and do not have the problem of known techniques generation ghost (crosstalk) phenomenon.
In another embodiment, but gamma voltage generator 610 is one to build the program integrated circuit of internal memory in having, and can store first group of gamma voltage V that time schedule controller 620 is provided in advance
11-V
1NAnd second group of gamma voltage V
21-V
2N, time schedule controller 620 is controlled first group of gamma voltage V that gamma voltage generator 610 is selected and output stores in advance behind receiving system input signal SI
11-V
1NOr second group of gamma voltage V
21-V
2N
After being noted that time schedule controller 620 receiving system input signal SI,, picture frame has blank time (blank time) between switching (being Alternation Display left-eye images and right-eye image) with first group of gamma voltage V
11-V
1NOr second group of gamma voltage V
21-V
2NWrite gamma voltage generator 610 or control gamma voltage generator 610 and select and export first group of gamma voltage V of storage in advance
11-V
1NOr second group of gamma voltage V
21-V
2N
See also Fig. 9, it is the driving method that illustrates according to 3 d display device of the present invention, and 3 d display device comprises a display panel, and display panel has a plurality of picture elements, and this method comprises:
Among the step S900, an image data is provided, image data is to provide according to system's input signal.
Among the step S910; When each these picture element is when driving for identical polar at a last picture frame and a present picture frame; One first group of gamma voltage is provided,, one second group of gamma voltage is provided when each these picture element is when driving for opposed polarity at last picture frame and present picture frame; Under same gray level, the voltage difference of second a group of gamma voltage and a common electric voltage is the voltage difference greater than first group of gamma voltage and common electric voltage.First group of gamma voltage or second group of gamma voltage are to provide according to system's input signal.
The said system input signal is to be a low voltage differential signal or an embedded display port signal.
Among the step S920, select and export first group of gamma voltage or second group of gamma voltage according to each these picture element.
Among the step S930, according to image data and first group of gamma voltage or second group of gamma voltage to drive each these picture element.
In sum; Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention, to have common knowledge the knowledgeable in the technical field under the present invention, not break away from the spirit and scope of the present invention; When can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (9)
1. a 3 d display device is to adopt digraph frame conversion driving, and it is characterized in that: this 3 d display device comprises:
One display panel has a plurality of picture elements;
Time schedule controller; One image data is provided and one first group of gamma voltage is provided or one second group of gamma voltage; Under same gray level, the voltage difference of this second a group of gamma voltage and a common electric voltage is the voltage difference greater than this first group of gamma voltage and this common electric voltage;
This first group of gamma voltage or this second group of gamma voltage are selected and exported to one gamma voltage generator according to each these picture element; And
At least one source electrode drive circuit, this first group of gamma voltage of exporting according to this image data and this gamma voltage generator or this second group of gamma voltage to be driving each these picture element,
Wherein when each these picture element be when driving at a last picture frame and a present picture frame for identical polar, this time schedule controller provides this first group of gamma voltage to this gamma voltage generator,
When this last picture frame and this present picture frame are when driving for opposed polarity, this time schedule controller provides this second group of gamma voltage to this gamma voltage generator.
2. 3 d display device according to claim 1 is characterized in that: wherein this time schedule controller is this image data to be provided and this first group of gamma voltage to be provided or this second group of gamma voltage according to system's input signal.
3. 3 d display device according to claim 2 is characterized in that: wherein this system's input signal is to be a low voltage differential signal or an embedded display port signal.
4. 3 d display device according to claim 1 is characterized in that: wherein this gamma voltage generator is to be a programmable integrated circuit, and this time schedule controller writes this gamma voltage generator with this first group of gamma voltage or this second group of gamma voltage.
5. 3 d display device according to claim 4 is characterized in that: wherein this time schedule controller is to see through an internal integration circuit interface this first group of gamma voltage or this second group of gamma voltage are write this gamma voltage generator.
6. 3 d display device according to claim 1; It is characterized in that: but wherein this gamma voltage generator is one to build the program integrated circuit of internal memory in having, in order to store this first group of gamma voltage and this second group of gamma voltage that this time schedule controller provides.
7. the driving method of a 3 d display device, this 3 d display device are to adopt digraph frame conversion driving and comprise a display panel, and this display panel has a plurality of picture elements, it is characterized in that, this method comprises:
One image data is provided;
When each these picture element is when driving for identical polar at a last picture frame and a present picture frame; One first group of gamma voltage is provided; When each these picture element is when driving for opposed polarity at this last picture frame and this present picture frame; One second group of gamma voltage is provided, and under same gray level, the voltage difference of this second a group of gamma voltage and a common electric voltage is the voltage difference greater than this first group of gamma voltage and this common electric voltage;
Select and export this first group of gamma voltage or this second group of gamma voltage according to each these picture element; And
According to this image data and this first group of gamma voltage or this second group of gamma voltage to drive each these picture element.
8. the driving method of 3 d display device according to claim 7 is characterized in that: wherein be this image data to be provided and this first group of gamma voltage to be provided or this second group of gamma voltage according to system's input signal.
9. the driving method of 3 d display device according to claim 8, it is characterized in that: wherein this system's input signal is to be a low voltage differential signal or an embedded display port signal.
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| CN108630165A (en) * | 2018-06-29 | 2018-10-09 | 深圳市华星光电技术有限公司 | A kind of control circuit and liquid crystal display panel of liquid crystal display panel |
| WO2020000508A1 (en) * | 2018-06-29 | 2020-01-02 | 深圳市华星光电技术有限公司 | Control circuit of liquid crystal display panel and liquid crystal display panel |
| CN108630165B (en) * | 2018-06-29 | 2020-02-28 | 深圳市华星光电技术有限公司 | Control circuit of liquid crystal display panel and liquid crystal display panel |
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| CN102663974B (en) | 2014-12-03 |
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