CN103810976B - Integrated source electrode driver and liquid crystal display thereof - Google Patents
Integrated source electrode driver and liquid crystal display thereof Download PDFInfo
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- CN103810976B CN103810976B CN201210459934.2A CN201210459934A CN103810976B CN 103810976 B CN103810976 B CN 103810976B CN 201210459934 A CN201210459934 A CN 201210459934A CN 103810976 B CN103810976 B CN 103810976B
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Abstract
The present invention discloses a kind of integrated source electrode driver, in a liquid crystal display, includes a generating circuit from reference voltage, and be used for provides multiple adjustable-voltage scope between a power supply supply voltage and a ground connection level; And a reference voltage selection circuit, include multiple digital analog converter, be used for according to a control signal, select respectively to produce multiple internal reference voltage in the plurality of adjustable-voltage scope; Wherein, the plurality of adjustable-voltage scope has descending.
Description
Technical field
The present invention relates to a kind of integrated source electrode driver and liquid crystal display thereof, particularly relate to one external reference voltage device to be integrated, and limit the adjustable-voltage scope of each internal reference voltage produced, to save integrated source electrode driver and the liquid crystal display thereof of hardware consumption or increase Voltage Cortrol resolution.
Background technology
Due to low price and the high quality of liquid crystal display, liquid crystal display has been widely used in notebook (notebook), PDA(Personal Digital Assistant), mobile phone, and in the information products such as clock and watch.
Liquid crystal display formed primarily of single or multiple source electrode driver, single or multiple gate pole driver and a panel.Source electrode driver and gate pole driver are used for data line (dataline) crisscross in control panel and sweep trace (scanline) respectively, and the junction of each data line and sweep trace is connected with a thin film transistor (TFT), that is thin film transistor (TFT) is distributed in panel in the mode of matrix, and each thin film transistor (TFT) corresponds to a pixel (Pixel).Wherein, conventional source driver needs to receive many group external reference voltages to export correct voltage to data line, and then the pixel of the panel of driving liquid crystal displays shows.Therefore reference voltage plays important role, and many application can use extra reference voltage generator, strengthens the driving force of reference voltage and burning voltage.
In addition, general panel application can change source electrode driver output voltage by adjustment reference voltage, and then reach the object of adjustment picture color, therefore the reference voltage generator of supply source driver reference voltage needs to adjust reference voltage.
Please refer to Fig. 1, Fig. 1 is that a known sources driver 10 receives positive polarity gamma reference voltage VPR by an external reference voltage generator 12
1~ VPR
mand negative polarity gamma reference voltage VNR
1~ VNR
mschematic diagram.As shown in Figure 1, known sources driver 10 receives positive polarity gamma reference voltage VPR by external reference voltage generator 12
1~ VPR
mand negative polarity gamma reference voltage VNR
1~ VNR
mafter, after being processed by a positive polarity Gamma correction resistance 102 and a negative polarity Gamma correction resistance 104 again, by following digital analog converter (digitaltoanalogconverter, DAC) and interlock circuit export correct voltage to data line and drive corresponding pixel, this part is well known to those of ordinary skill in the art, does not repeat them here.
In the case, for saving system cost and dynamic conditioning reference voltage, separately external reference voltage generator 12 and known sources driver 10 are incorporated in an integrated source electrode driver in known technology, to organize reference voltage by simple control mode in integrated source electrode driver inside generation more.
It should be noted that, because known external reference voltage generator 12 is in order to coordinate the demand of different application, therefore exported each reference voltage must utilize controlling mechanism adjustment, and need provide the setting range of track to track (rail-to-rail) (namely each reference voltage can adjust between a power supply supply voltage of outside reference voltage generator 12 and a ground connection level).
But, if directly known external reference voltage generator 12 is incorporated into integrated source electrode driver with known sources driver 10, needed for source electrode driver 10, the quantity of reference voltage is larger, if therefore the setting range of reference voltage is still identical with the setting range of known external reference voltage generator 12 track to track, and maintaining height adjustment resolution, then hardware consumption can be quite large.In view of this, real necessity having improvement of known technology.
Summary of the invention
Therefore, namely fundamental purpose of the present invention is to provide one external reference voltage device can be integrated, and limit the adjustable-voltage scope of each internal reference voltage produced, to save integrated source electrode driver and the liquid crystal display thereof of hardware consumption or increase Voltage Cortrol resolution
The present invention discloses a kind of integrated source electrode driver, in a liquid crystal display.This integrated source electrode driver includes a generating circuit from reference voltage, and be used for provides multiple adjustable-voltage scope between a power supply supply voltage and a ground connection level; And a reference voltage selection circuit, include multiple digital analog converter, be used for according to a control signal, select respectively to produce multiple internal reference voltage in the plurality of adjustable-voltage scope; Wherein, the plurality of adjustable-voltage scope has descending.
The present invention also discloses a kind of liquid crystal display, and this liquid crystal display includes multiple data line; And multiple integrated source electrode driver, be used for respectively driving the picture element of data line corresponding in the plurality of data line.In the plurality of integrated source electrode driver, one first integrated source electrode driver includes a generating circuit from reference voltage, and be used for provides multiple adjustable-voltage scope between a power supply supply voltage and a ground connection level; And a reference voltage selection circuit, include multiple digital analog converter, be used for according to a control signal, select respectively to produce multiple first internal reference voltage in the plurality of adjustable-voltage scope; Wherein, the plurality of adjustable-voltage scope has descending.
Coordinate following schemes, the detailed description of embodiment and claims at this, by address after other object of the present invention and advantage be specified in.
Accompanying drawing explanation
Fig. 1 is that a known sources driver receives the schematic diagram of positive polarity gamma reference voltage and negative polarity gamma reference voltage by an external reference voltage generator.
Fig. 2 is the schematic diagram of the integrated source electrode driver of the embodiment of the present invention one.
Fig. 3 is the schematic diagram of an output voltage curve.
Fig. 4 is the schematic diagram of the adjustable-voltage scope shown in Fig. 2.
Fig. 5 is for being used for the schematic diagram of the integrated source electrode driver realizing the integrated source electrode driver shown in Fig. 2.
Fig. 6 is the schematic diagram of another integrated source electrode driver of the embodiment of the present invention.
Fig. 7 is the schematic diagram of a embodiment of the present invention more integrated source electrode driver.
Fig. 8 is the schematic diagram of a embodiment of the present invention more integrated source electrode driver.
Fig. 9 is the schematic diagram of a embodiment of the present invention more integrated source electrode driver.
Figure 10 is the schematic diagram of the integrated source electrode driver of the embodiment of the present invention two in a panel application.
Figure 11 is the schematic diagram of the another two integrated source electrode drivers of the embodiment of the present invention in a panel application.
Figure 12 is the schematic diagram of the integrated source electrode driver of the embodiment of the present invention three in a panel application.
Figure 13 is the integrated source electrode driver of the embodiment of the present invention one and the two source electrode drivers schematic diagram in a panel application.
Figure 14 is the detailed maps of the integrated source electrode driver shown in Fig. 5.
Wherein, description of reference numerals is as follows:
10,130b, 130c source electrode driver
12 external reference voltage generators
102,510,710,910 positive polarity Gamma correction resistance
104,512,712,912 negative polarity Gamma correction resistance
20,50 ~ 90, the integrated source electrode driver of 50a, 50b, 60a, 60b
202,602,802,804 generating circuit from reference voltage
204,206 reference voltage selection circuits
208,708,908 source electrode drive circuits
The integrated source electrode driver of 120a, 120b, 120c, 130a
VPR
1~ VPR
mpositive polarity gamma reference voltage
VNR
1~ VNR
mnegative polarity gamma reference voltage
PVB
1~ PVB
m, NVB
1~ NVB
mvoltage buffer
PAVR
1~ PAVR
m, NAVR
1~ NAVR
madjustable-voltage scope
CON control signal
VPREF
1~ VPREF
m, VNREF
1~ VNREF
minternal reference voltage
VS power supply supply voltage
GND ground connection level
PDAC
1~ PDAC
m, NDAC
1~ NDAC
mdigital analog converter
VREF
1~ VREF
aexternal reference voltage
VB
1~ VB
avoltage buffer
EVPREF
1~ EVPREF
bexternal reference voltage
EVNREF
1~ EVNREF
bexternal reference voltage
EPVB
1~ EPVB
b, ENVB
1~ ENVB
bvoltage buffer
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the integrated source electrode driver 20 of the embodiment of the present invention one.As shown in Figure 2, integrated source electrode driver 20 includes generating circuit from reference voltage 202, positive polarity reference voltage selection circuit 204, negative polarity reference voltage selection circuit 206, positive polarity voltage impact damper PVB
1~ PVB
m, reverse voltage impact damper NVB
1~ NVB
mand one source pole driving circuit 208.
In simple terms, generating circuit from reference voltage 202 provides positive polarity adjustable-voltage scope PAVR between a power supply supply voltage VS and a ground connection level GND
1~ PAVR
m, negative polarity adjustable-voltage scope NAVR
1~ NAVR
mgive reference voltage selection circuit 204,206, reference voltage selection circuit 204,206 includes digital analog converter (digitaltoanalogconverter, DAC) PDAC respectively
1~ PDAC
m, NDAC
1~ NDAC
m(not illustrating the embodiment shown in Fig. 2), is used for according to a control signal CON of digital form, respectively at adjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
mmiddle selection produces internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mgive voltage buffer PVB
1~ PVB
m, NVB
1~ NVB
m, voltage buffer PVB
1~ PVB
m, NVB
1~ NVB
mto internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mafter cushioning, lockable voltage quasi position is with stable output internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mgive source electrode drive circuit 208, make source electrode drive circuit 208 can according to internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mdrive.Wherein, adjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
mthere is descending (i.e. internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mthere is descending), and the structure of source electrode drive circuit 208 and operation similar to known sources driver 10.
In the case, due to adjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
msuccessively decrease formal distribution between power supply supply voltage VS and ground connection level GND, therefore corresponding digital analog converter PDAC
1~ PDAC
m, NDAC
1~ NDAC
mby internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mat adjustable-voltage scope PAVR out of the ordinary
1~ PAVR
m, NAVR
1~ NAVR
minside carry out adjusting but not adjusting between power supply supply voltage VS and ground connection level GND.Thus, due to internal reference voltage VPREF in integrated source electrode driver 20
1~ VPREF
m, VNREF
1~ VNREF
madjustable amplitude is less, and therefore the present invention can save hardware consumption or increase Voltage Cortrol resolution under same hardware under identical Voltage Cortrol resolution.
Specifically, please refer to Fig. 3 and Fig. 4, Fig. 3 is the schematic diagram of an output voltage curve, and Fig. 4 is the adjustable-voltage scope PAVR shown in Fig. 2
1~ PAVR
m, NAVR
1~ NAVR
mschematic diagram.As shown in Figure 3, internal reference voltage VPREF in panel application
1~ VPREF
m, VNREF
1~ VNREF
min the output voltage curve that corresponding input data produce (i.e. a gamma curve), the internal reference voltage VPREF needed for source electrode drive circuit 208
1~ VPREF
m, VNREF
1~ VNREF
mbe divided into positive-negative polarity and have descending (from negative polarity toward positive polarity then for increasing progressively), therefore integrated source electrode driver 20 produces internal reference voltage VPREF through integrating by inside
1~ VPREF
m, VNREF
1~ VNREF
mtime, internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mdo not need as known external reference voltage generator 12 has the setting range (namely between power supply supply voltage VS and ground connection level GND all adjustable) of track to track (rail-to-rail), and can according to the gamma curve adjustment internal reference voltage VPREF of practical application
1~ VPREF
m, VNREF
1~ VNREF
madjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
mmaxima and minima carry out optimization.
Specifically, as shown in Figure 4, due to internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mhave descending, be therefore by adjustable-voltage scope PAVR in integrated source electrode driver 20
1~ PAVR
m, NAVR
1~ NAVR
mdesign is contracted to a particular range respectively and is distributed between power supply supply voltage VS and ground connection level GND.Although it should be noted that the adjustable-voltage scope PAVR shown in Fig. 4
1~ PAVR
m, NAVR
1~ NAVR
mdo not overlap each other, but in other embodiments, according to different panels application, adjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
malso can partly overlap each other.Thus, due to adjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
mlittle compared with the setting range of track to track between power supply supply voltage VS and ground connection level GND, therefore the present invention can reach the effect of to save hardware consumption or increasing Voltage Cortrol resolution under identical Voltage Cortrol resolution under same hardware.
For example, the setting range often organizing reference voltage due to known external reference voltage generator 12 is track to track, suppose that power supply supply voltage VS is 16V, if use the digital analog converter of 10 (bit), then the adjustment resolution of every single order is 16V/1024=15.6mV.In comparison, in the integrated source electrode driver 20 of the present invention, can consider adjustable-voltage scope PAVR according to practical application situation
1~ PAVR
m, NAVR
1~ NAVR
min each adjustable-voltage scope be limited in 2V.In this case, in one embodiment, the present invention can be designed to 7 with reference to each digital analog converter in voltage selecting circuit 204,206 and namely reach the adjustment resolution that every single order is 2V/128=15.6mV, thus saves hardware consumption; In another embodiment, the present invention can also be designed to 10 and reach the adjustment resolution that every single order is 2V/1024<2mV with reference to each digital analog converter in voltage selecting circuit 204,206, thus increases Voltage Cortrol resolution.Thus, the present invention can produce less internal reference voltage VPREF according in the integrated source electrode driver of practical application 20
1~ VPREF
m, VNREF
1~ VNREF
madjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
m, therefore compared with known external reference voltage generator 12, higher adjustment resolution can be reached under same hardware consumption, or only need to use less hardware under equal resolution.
Specifically, please refer to Fig. 5, Fig. 5 is for being used for the schematic diagram of the integrated source electrode driver 50 realizing the integrated source electrode driver 20 shown in Fig. 2.As shown in Figure 5, integrated source electrode driver 50 is the detailed maps of integrated source electrode driver 20, therefore acts on similar assembly and signal represents with same-sign.Generating circuit from reference voltage 202, by electric resistance partial pressure or alternate manner, directly produces positive polarity adjustable-voltage scope PAVR between power supply supply voltage VS and ground connection level GND
1~ PAVR
m, negative polarity adjustable-voltage scope NAVR
1~ NAVR
mgive corresponding digital analog converter PDAC
1~ PDAC
m, NDAC
1~ NDAC
m, make digital analog converter PDAC
1~ PDAC
m, NDAC
1~ NDAC
mcan respectively according to received control signal CON at adjustable-voltage scope PAVR
1~ PAVR
m, NAVR
1~ NAVR
mselect and export corresponding internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
m(namely corresponding respectively to the rank, specific voltage position in control signal CON corresponding to a certain number bit code), then voltage buffer PVB
1~ PVB
m, NVB
1~ NVB
mmode of can feedbacking is stable exports internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mgive positive polarity Gamma correction resistance 510 and a negative polarity Gamma correction resistance 512 of source electrode drive circuit 208, to carry out subsequent operation.Wherein, control signal CON control figure analog converter PDAC
1~ PDAC
m, NDAC
1~ NDAC
mproduce internal reference voltage VPREF out of the ordinary
1~ VPREF
m, VNREF
1~ VNREF
mnumerical code and incomplete same (as internal reference voltage VPREF
1position is at adjustable-voltage scope PAVR
1the upper limit and internal reference voltage VPREF
2position is at adjustable-voltage scope PAVR
2lower limit).Under such configuration, adjustable digital analog converter PDAC of the present invention
1~ PDAC
m, NDAC
1~ NDAC
mfigure place, and then reach the effect of to save hardware consumption or increasing Voltage Cortrol resolution under identical Voltage Cortrol resolution under same hardware.
It should be noted that main spirits of the present invention is that carrying out integration produces internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mtime, corresponding adjustable-voltage scope PAVR can be reduced according to practical application
1~ PAVR
m, NAVR
1~ NAVR
m, therefore can reach higher adjustment resolution under same hardware consumption, or only need to use less hardware under equal resolution.Those of ordinary skill in the art when carrying out according to this modifying or changing, and are not limited thereto.For example, in the embodiment shown in fig. 5, generating circuit from reference voltage 202, by electric resistance partial pressure or alternate manner, directly produces adjustable-voltage scope PAVR between power supply supply voltage VS and ground connection level GND
1~ PAVR
m, NAVR
1~ NAVR
m, but in other embodiments, also can receive external reference voltage and produce adjustable-voltage scope PAVR according to this again
1~ PAVR
m, NAVR
1~ NAVR
m.
For example, please refer to Fig. 6, Fig. 6 is the schematic diagram of another integrated source electrode driver 60 of the embodiment of the present invention.As shown in Figure 6, integrated source electrode driver 60 is identical with source electrode driver 20 part integrated shown in Fig. 5, therefore acts on similar assembly and signal represents with same-sign.Integrated source electrode driver 60 is with the essential difference of integrated source electrode driver 20, and the generating circuit from reference voltage 602 included by integrated source electrode driver 60 separately receives external reference voltage VREF
1~ VREF
a, and according to external reference voltage VREF
1~ VREF
aadjustable-voltage scope PAVR is provided between power supply supply voltage VS and ground connection level GND
1~ PAVR
m, NAVR
1~ NAVR
mmiddle at least one.
In this case, directly between power supply supply voltage VS and ground connection level GND, adjustable-voltage scope PAVR is produced compared to the generating circuit from reference voltage 202 shown in Fig. 5
1~ PAVR
m, NAVR
1~ NAVR
m, and adjustable-voltage scope PAVR may be caused when the unstable disturbance of power supply supply voltage VS
1~ PAVR
m, NAVR
1~ NAVR
mskew ideal value, generating circuit from reference voltage 602 receives by voltage buffer VB in the present embodiment
1~ VB
athe stable external reference voltage VREF provided after buffering
1~ VREF
aas reference voltage point, therefore there is stable reference voltage point between power supply supply voltage VS and ground connection level GND, and stable adjustable-voltage scope PAVR can be produced
1~ PAVR
m, NAVR
1~ NAVR
m.It should be noted that the present invention carries out integration and produces internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
m, to reduce external reference voltage point, therefore can save system cost and dynamic conditioning reference voltage, the external reference voltage VREF therefore received by outside in Fig. 6
1~ VREF
aquantity should be less than required internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mquantity (i.e. A<2m), carry out integrating had advantage to reach.
In addition, please refer to Fig. 7, Fig. 7 is the schematic diagram of a embodiment of the present invention more integrated source electrode driver 70.As shown in Figure 7, integrated source electrode driver 70 is identical with integrated source electrode driver 60 part, therefore acts on similar assembly and signal represents with same-sign.Integrated source electrode driver 70 is with the essential difference of integrated source electrode driver 60, and the one source pole driving circuit 708 included by integrated source electrode driver 70 receives external reference voltage VREF by a positive polarity Gamma correction resistance 710 and a negative polarity Gamma correction resistance 712
1, VREF
a, then according to internal reference voltage VPREF
2~ VPREF
m, VNREF
1~ VNREF
m-1and external reference voltage VREF
1, VREF
adrive.In this case, due to external reference voltage VREF
1, VREF
aalso can adjust in its particular voltage range, therefore source electrode drive circuit 708 can directly by external reception external reference voltage VREF
1, VREF
a, with replace as in Fig. 6 by inside the internal reference voltage VPREF that produces
1, VNREF
m, and then save corresponding digital analog converter PDAC
1, NDAC
mwith positive polarity voltage impact damper PVB
1, NVB
mhardware consumption.
Moreover please refer to Fig. 8, Fig. 8 is the schematic diagram of a embodiment of the present invention more integrated source electrode driver 80.As shown in Figure 8, integrated source electrode driver 80 is identical with integrated source electrode driver 60 part, therefore acts on similar assembly and signal represents with same-sign.Integrated source electrode driver 80 is with the essential difference of integrated source electrode driver 60, integrated source electrode driver 80 comprises a positive polarity generating circuit from reference voltage 802 and a negative polarity generating circuit from reference voltage 804(also can be integrated into a generating circuit from reference voltage), be used for respectively receiving external reference voltage EVPREF
1~ EVPREF
b, EVNREF
1~ EVNREF
b, and according to external reference voltage EVPREF
1~ EVPREF
b, EVNREF
1~ EVNREF
badjustable-voltage scope PAVR is provided between power supply supply voltage VS and ground connection level GND
1~ PAVR
m, NAVR
1~ NAVR
mmiddle at least one.
Positive polarity generating circuit from reference voltage 802 and negative polarity generating circuit from reference voltage 804 receive by voltage buffer EPVB in the present embodiment
1~ EPVB
b, ENVB
1~ ENVB
bthe stable external reference voltage EVPREF provided after buffering
1~ EVPREF
b, EVNREF
1~ EVNREF
bpoint as the reference voltage, therefore has stable reference voltage point, and can produce stable adjustable-voltage scope PAVR between power supply supply voltage VS and ground connection level GND
1~ PAVR
m, NAVR
1~ NAVR
m.Wherein, external reference voltage EVPREF
1be a maximum positive polarity reference voltage, external reference voltage EVPREF
bbe a minimum positive polarity reference voltage, external reference voltage EVNREF
1be a maximum negative polarity reference voltage and external reference voltage EVNREF
bbe a minimal negative polarity reference voltage.
In this case, due to external reference voltage EVPREF
1, EVPREF
b, EVNREF
1, EVNREF
bfor stable reference voltage point, therefore the scope of positive polarity reference voltage and negative polarity reference voltage in positive polarity generating circuit from reference voltage 802 and negative polarity generating circuit from reference voltage 804 can clearly be defined, to avoid the cumulative errors caused during electric resistance partial pressure, and help at increase generation internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
maccuracy.It should be noted that the present invention carries out integration and produces internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
m, to reduce external reference voltage point, therefore can save system cost and dynamic conditioning reference voltage, the external reference voltage EVPREF therefore received by outside in Fig. 8
1~ EVPREF
b, EVNREF
1~ EVNREF
bquantity should be less than required internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mquantity (i.e. 2B<2m), carry out integrating had advantage to reach.
In addition, please refer to Fig. 9, Fig. 9 is the schematic diagram of a embodiment of the present invention more integrated source electrode driver 90.As shown in Figure 9, integrated source electrode driver 90 is identical with integrated source electrode driver 80 part, therefore acts on similar assembly and signal represents with same-sign.Integrated source electrode driver 90 is with the essential difference of integrated source electrode driver 90, and the one source pole driving circuit 908 included by integrated source electrode driver 90 receives external reference voltage EVPREF by a positive polarity Gamma correction resistance 910 and a negative polarity Gamma correction resistance 912
1, EVNREF
b, then according to internal reference voltage VPREF
2~ VPREF
m, VNREF
1~ VNREF
m-1and external reference voltage EVPREF
1, EVNREF
bdrive, wherein, external reference voltage EVPREF
1be a maximum positive polarity reference voltage and external reference voltage EVNREF
bbe a minimal negative polarity reference voltage.In this case, due to external reference voltage EVPREF
1, EVNREF
balso can adjust in its particular voltage range, therefore source electrode drive circuit 908 can directly by external reception external reference voltage EVPREF
1, EVNREF
b, with replace as in Fig. 8 by inside the internal reference voltage VPREF that produces
1, VNREF
m, and then save corresponding digital analog converter PDAC
1, NDAC
mwith positive polarity voltage impact damper PVB
1, NVB
mhardware consumption.
It should be noted that, in the above-described embodiments, generating circuit from reference voltage and source electrode drive circuit receive the external reference voltage of specific level and specific quantity respectively, there is stable reference voltage point and save hardware consumption, but in other embodiments, generating circuit from reference voltage and source electrode drive circuit also according to the actual requirements, can receive the external reference voltage with other level and other quantity respectively, and still have stable reference voltage point and save hardware consumption.In addition, Fig. 5 to Fig. 9 is the embodiment of single integrated source electrode driver, and the panel application of general liquid crystal display needs multiple source electrode driver to drive the pixel of corresponding data line respectively, multiple integrated source electrode driver therefore also can be used in other embodiments to meet the panel application of liquid crystal display.
For example, please refer to Figure 10, Figure 10 is the embodiment of the present invention integrated source electrode driver 50a, 50b schematic diagram in a panel application.Integrated source electrode driver 50a, 50b are identical with integrated source electrode driver 50, therefore omit label in the hope of succinctly.In this case, integrated source electrode driver 50a, 50b are direct owing to producing internal reference voltage between power supply supply voltage and ground connection level to drive the pixel of corresponding data line respectively, and therefore outside only needs provide control signal CON and do not need to provide external reference voltage.
In addition, please refer to Figure 11, Figure 11 is the embodiment of the present invention integrated source electrode driver 110a, 110b schematic diagram in a panel application.Integrated source electrode driver 110a, 110b at least one can realize in the middle of integrated source electrode driver 60,70,80,90, therefore omit label in the hope of succinctly.In this case, integrated source electrode driver 110a, 110b receive stable external reference voltage VREF
1~ VREF
aas reference voltage point, then produce internal reference voltage to drive the pixel of corresponding data line, therefore outside can provide external reference voltage VREF in the lump
1~ VREF
agive integrated source electrode driver 110a, 110b.
Moreover please refer to Figure 12, Figure 12 is the embodiment of the present invention integrated source electrode driver 120a, 120b, 120c schematic diagram in a panel application.Integrated source electrode driver 120a, 120b, 120c are identical with at least one part in the middle of integrated source electrode driver 60,70,80,90, therefore omit label in the hope of succinctly.In the middle of integrated source electrode driver 120a, 120b, 120c and integrated source electrode driver 60,70,80,90, the essential difference of at least one is, integrated source electrode driver 120a produces internal reference voltage VPREF
1~ VPREF
2, and internal reference voltage VPREF is provided
1~ VPREF
2give integrated source electrode driver 120b, 120c to drive.In the case, integrated source electrode driver 120b, 120c directly can be produced internal reference voltage VPREF by the integrated source electrode driver 120a of external reception
1~ VPREF
2, and save the hardware consumption of corresponding digital analog converter and positive polarity voltage impact damper.The rest may be inferred, and integrated source electrode driver 120b can provide internal reference voltage VPREF
3~ VPREF
4giving integrated source electrode driver 120a, 120c makes it save the hardware consumption of corresponding digital analog converter and positive polarity voltage impact damper, and integrated source electrode driver 120c can provide internal reference voltage VPREF
5~ VPREF
6giving integrated source electrode driver 120a, 120b makes it save the hardware consumption of corresponding digital analog converter and positive polarity voltage impact damper.Thus, this integrated source class driver is only provided to use because the inner internal reference voltage produced via control signal CON of an integrated source electrode driver is not limited to, therefore each integrated source electrode driver can produce part internal reference voltage respectively for other integrated source electrode driver, and can the internal reference voltage that produces of other integrated source electrode driver as the external reference voltage shown in Fig. 6 to Fig. 9, and then reduce or do not need outside to provide reference voltage point
Further, please refer to the 13rd figure, the 13rd figure is the integrated source electrode driver 130a of the embodiment of the present invention and source electrode driver 130b, 130c schematic diagram in a panel application.Integrated source electrode driver 130a is identical with integrated source electrode driver 50 part, therefore omits label in the hope of succinctly.The essential difference of integrated source electrode driver 130a and integrated source electrode driver 50 is, integrated source electrode driver 130a produces internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mafter, totality reference voltage VPREF is provided
1~ VPREF
m, VNREF
1~ VNREF
mgive source electrode driver 130b, 130c to drive.In the case, source electrode driver 130b, 130c can directly by external reception integrated source electrode driver 130a produce whole internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
m, and save the hardware consumption (namely integrated source electrode driver 130b, 130c are similar to known sources driver 10) of corresponding digital analog converter and positive polarity voltage impact damper completely.
It should be noted that, in the above-described embodiments, after the circuit that outside is produced reference voltage by integrated source electrode driver is integrated, generation internal reference voltage gives source electrode drive circuit and drives, and the circuit that the circuit integrated carries out driving according to reference voltage with script source electrode driver is not identical.Specifically, please refer to the 14th figure, the 14th figure is the detailed maps of the integrated source electrode driver 50 shown in Fig. 5.As shown in Figure 14, positive polarity Gamma correction resistance 510 and negative polarity Gamma correction resistance 512 receive internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mbe sent to digital analog converter in source electrode drive circuit 208 to carry out selecting (this digital analog converter and digital analog converter PDAC
1~ PDAC
m, NDAC
1~ NDAC
mnot identical), therefore after source electrode drive circuit 208 can utilize bi-directional shift buffer (Bi-directionalshiftregister), linear buffer (linebuffer), position quasi converter (levelshifter), digital analog converter, impact damper, output multiplexer, export correct voltage quasi position to drive, this part is well known to those of ordinary skill in the art, does not repeat them here.
In known technology, if directly known external reference voltage generator 12 is incorporated into integrated source electrode driver with known sources driver 10, needed for source electrode driver 10, the quantity of reference voltage is larger, if therefore the setting range of reference voltage is still identical with the setting range of known external reference voltage generator 12 track to track, and maintaining height adjustment resolution, then hardware consumption can be quite large.In comparison, the present invention carries out integration generation internal reference voltage VPREF
1~ VPREF
m, VNREF
1~ VNREF
mtime, corresponding adjustable-voltage scope PAVR can be reduced according to practical application
1~ PAVR
m, NAVR
1~ NAVR
m, therefore can reach higher adjustment resolution under same hardware consumption, or only need to use less hardware under equal resolution.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. an integrated source electrode driver, in a liquid crystal display, is characterized in that, includes:
One generating circuit from reference voltage, is used for providing multiple adjustable-voltage scope between a power supply supply voltage and a ground connection level; And
One reference voltage selection circuit, includes multiple digital analog converter, is used for according to a control signal, selects respectively to produce multiple internal reference voltage in the plurality of adjustable-voltage scope;
The plurality of adjustable-voltage scope has descending;
Wherein, this generating circuit from reference voltage receives at least one first external reference voltage, and between this power supply supply voltage and this ground connection level, provides at least one in the plurality of adjustable-voltage scope according to this at least one first external reference voltage.
2. integrated source electrode driver as claimed in claim 1, is characterized in that, also include:
Multiple first voltage buffer, is respectively coupled to the plurality of digital analog converter, is used for cushioning the plurality of internal reference voltage; And
One source pole driving circuit, is used for driving according to the plurality of internal reference voltage received by the plurality of first voltage buffer.
3. integrated source electrode driver as claimed in claim 1, is characterized in that, multiple second voltage buffer cushions this at least one first external reference voltage.
4. integrated source electrode driver as claimed in claim 1, is characterized in that, the quantity of this at least one first external reference voltage is less than the quantity of the plurality of internal reference voltage.
5. integrated source electrode driver as claimed in claim 1, is characterized in that, also comprises one source pole driving circuit, is used for receiving at least one second external reference voltage, and drives according to the plurality of internal reference voltage and this at least one second external reference voltage.
6. integrated source electrode driver as claimed in claim 1, it is characterized in that, this at least one first external reference voltage includes a maximum positive polarity reference voltage, a minimum positive polarity reference voltage, a maximum negative polarity reference voltage and a minimal negative polarity reference voltage.
7. integrated source electrode driver as claimed in claim 5, is characterized in that, this at least one second external reference voltage includes a maximum positive polarity reference voltage and a minimal negative polarity reference voltage.
8. a liquid crystal display, is characterized in that, includes:
Multiple data line; And
Multiple integrated source electrode driver, be used for respectively driving the pixel of data line corresponding in the plurality of data line, in the plurality of integrated source electrode driver, one first integrated source electrode driver includes:
One generating circuit from reference voltage, is used for providing multiple adjustable-voltage scope between a power supply supply voltage and a ground connection level; And
One reference voltage selection circuit, includes multiple digital analog converter, is used for according to a control signal, selects respectively to produce multiple first internal reference voltage in the plurality of adjustable-voltage scope;
The plurality of adjustable-voltage scope has descending;
Wherein, this generating circuit from reference voltage receives at least one first external reference voltage, and between this power supply supply voltage and this ground connection level, provides at least one in the plurality of adjustable-voltage scope according to this at least one first external reference voltage.
9. liquid crystal display as claimed in claim 8, it is characterized in that, this first integrated source electrode driver also includes:
Multiple first voltage buffer, is respectively coupled to the plurality of digital analog converter, is used for cushioning the plurality of first internal reference voltage; And
One source pole driving circuit, is used for driving according to the plurality of first internal reference voltage received by the plurality of first voltage buffer.
10. liquid crystal display as claimed in claim 8, it is characterized in that, multiple second voltage buffer cushions this at least one first external reference voltage.
11. liquid crystal display as claimed in claim 8, is characterized in that, the quantity of this at least one first external reference voltage is less than the quantity of the plurality of first internal reference voltage.
12. liquid crystal display as claimed in claim 8, it is characterized in that, this first integrated source electrode driver also comprises one source pole driving circuit, be used for receiving at least one second external reference voltage, and drive according to the plurality of first internal reference voltage and this at least one second external reference voltage.
13. liquid crystal display as claimed in claim 8, it is characterized in that, this at least one first external reference voltage includes a maximum positive polarity reference voltage, a minimum positive polarity reference voltage, a maximum negative polarity reference voltage and a minimal negative polarity reference voltage.
14. liquid crystal display as claimed in claim 12, is characterized in that, this at least one second external reference voltage includes a maximum positive polarity reference voltage and a minimal negative polarity reference voltage.
15. liquid crystal display as claimed in claim 8, is characterized in that, this first integrated source electrode driver provides the plurality of first internal reference voltage to give one second integrated source electrode driver in the plurality of integrated source electrode driver and drives.
16. liquid crystal display as claimed in claim 15, is characterized in that, this first integrated source electrode driver receives multiple second internal reference voltage by one second integrated source electrode driver in the plurality of integrated source electrode driver and drives.
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| CN201210459934.2A CN103810976B (en) | 2012-11-15 | 2012-11-15 | Integrated source electrode driver and liquid crystal display thereof |
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| KR100864917B1 (en) * | 2001-11-03 | 2008-10-22 | 엘지디스플레이 주식회사 | Mehtod and apparatus for driving data of liquid crystal display |
| KR101081765B1 (en) * | 2005-11-28 | 2011-11-09 | 엘지디스플레이 주식회사 | Liquid crystal display device and driving method of the same |
| KR100962916B1 (en) * | 2008-08-06 | 2010-06-10 | 삼성모바일디스플레이주식회사 | Driver ic and organic ligth emitting display using the same |
| TWI404011B (en) * | 2009-03-18 | 2013-08-01 | Pervasive Display Co Ltd | Non-volatile display module and non-volatile display apparatus |
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