CN101893773B - Display and gamma adjustment circuit thereof - Google Patents
Display and gamma adjustment circuit thereof Download PDFInfo
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- CN101893773B CN101893773B CN200910051696XA CN200910051696A CN101893773B CN 101893773 B CN101893773 B CN 101893773B CN 200910051696X A CN200910051696X A CN 200910051696XA CN 200910051696 A CN200910051696 A CN 200910051696A CN 101893773 B CN101893773 B CN 101893773B
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- adjustment
- partial pressure
- voltage
- pressure unit
- gamma
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Abstract
The invention provides a display and a gamma adjustment circuit thereof. The gamma adjustment circuit can be configured on a printed circuit board, and comprises a plurality of first partial pressure units, wherein the first partial pressure units are connected in series between a first reference voltage and a second reference voltage. Furthermore, each first partial pressure unit comprises a first reference resistor and a first impedance adjustment element, wherein the first impedance adjustment element is electrically connected with the first reference resistor; and the first impedance adjustment element is used for adjusting equivalent impedance of the located first partial pressure unit, and at least one of the first impedance adjustment elements is a first adjustment resistor, and the rest first impedance adjustment elements are first lead wires.
Description
Technical field
The invention relates to a kind of display, and particularly relevant for a kind of gamma adjustment circuit of display.
Background technology
Along with the evolution of photoelectricity and semiconductor technology, driven the flourish of display.In many displays, (Liquid Crystal Display LCD) is widely used LCD recently, and (Cathode Ray Tube CRT) becomes one of the main flow of display of future generation to replace cathode-ray tube display.
The driving method of LCD is controlled the anglec of rotation of liquid crystal for seeing through the voltage that changes the liquid crystal layer two ends, and then changes the polarised direction of light.The liquid crystal layer two ends are electrically connected to pixel voltage and share voltage respectively.According to the direction of an electric field that is applied to liquid crystal layer, the driving method of LCD can be divided into the positive polarity driving and negative polarity drives.When pixel voltage is higher than share voltage, then is referred to as positive polarity and drives; Otherwise, when pixel voltage is lower than share voltage, then is referred to as negative polarity and drives.
The liquid crystal layer two ends are applied same voltage difference but during the different electric field direction, the transmittance of liquid crystal can not be affected.But the direction of an electric field of liquid crystal layer is permanent can't to rotate in response to electric field change just get off for a long time to make the liquid crystal quality deterioration for negative for just perhaps permanent swimmingly if put on, and this phenomenon is referred to as the liquid crystal polarization.Phenomenon for fear of liquid crystal polarization takes place, and must drive liquid crystal at the voltage that different time is used alternatingly opposed polarity, and just the mode with " reversal of poles " drives.
Figure 1A illustrates on the part of known a kind of LCD and looks synoptic diagram.Please with reference to Figure 1A; LCD 100 comprises a gamma circuit 120, a display panels 130 and a driving element 140, and the driving element 140 that wherein is made up of source electrode drive circuit 141 and gate driver circuit 142 is electrically connected between gamma circuit 120 and the display panel 130.Display panels 130 comprise many parallel data line 131a, 131b ..., many parallel sweep traces 132,134 ... and by the data line 131a that intersects each other, 131b ... with sweep trace 132,134 ... a plurality of pixel region 130a that defined, 130b ...; Wherein data line 131a electrically connects the source drive unit 141a in the source electrode drive circuit 141; And data line 131b electrically connects the source drive unit 141b in the source electrode drive circuit 141, and sweep trace 132,134 ... electrically connect gate driver circuit 142.In addition, gamma circuit 120 output gamma reference voltage V
GAMiTo source electrode drive circuit 141, so that source electrode drive circuit 141 provides display panels 130 required data voltage.
Figure 1B is the drive waveforms figure according to the display panels among Figure 1A, wherein V '
GBe the sweep signal that gate driver circuit 142 is provided, V '
GA, V '
GBBe respectively the sweep signal that sweep trace 132 transmits in A, B two places, V
DBe data line 131a, the last data voltage of 131b, V
PA1, V
PB1Be respectively the pixel voltage in pixel region 130a, the 130b.
Please be simultaneously with reference to Figure 1A and Figure 1B, in the picture frame time T
+In, LCD 100 drives for positive polarity, and in next picture frame time T
-In, LCD 100 drives for negative polarity.Wherein, in the picture frame time T
+In time t
1In and in the picture frame time T
-In time t
2In, gate driver circuit 142 provides sweep signal V '
GTo sweep trace 132, and source drive unit 141a, 141b in the source electrode drive circuit 141 provide data voltage V respectively
DTo data line 131a, 131b ....
In theory, the waveform that reaches the sweep signal of sweep trace 132 should be V '
G, but in fact, resistance capacitance late effect (RC delay) can make sweep signal V '
GWaveform distortion.Suppose sweep signal V ' with the comparatively approaching pixel region 130a of A place of gate driver circuit 142
GAWaveform and sweep signal V '
GWaveform identical, and be and sweep signal V ' with the waveform of the gate driver circuit 142 pixel region 130b of B place far away distortion
GThe sweep signal V ' that difference is very big
GB
As time t
1And time t
2During end, the pixel voltage among pixel region 130a, the 130b is along with sweep signal V '
GA, V '
GBSwitch to the influence of low level and be lower than data voltage V from high levle
D, this phenomenon is called feedthrough effect (feed-through effect), at this moment pixel voltage and data voltage V
DBetween difference then be called feed-trough voltage (feed-through voltage).Yet, the sweep signal V ' at A, B two places
GA, V '
GBAnd inequality, therefore, the feed-trough voltage Δ V of pixel region 130a
FTANaturally can not equal the feed-trough voltage Δ V of pixel region 130b
FTB
Hold above-mentionedly, with regard to the 130a of pixel zone, share voltage should be set at pixel voltage V
PA+With pixel voltage V
PA-Intermediate value V
ComA, to guarantee the display quality of the pixel region 130a of A place.Yet with regard to the 130b of pixel zone, share voltage but will be set at pixel voltage V
PB+With pixel voltage V
PB-Intermediate value V
ComB, just can guarantee the display quality of the pixel region 130b of B place.Hence one can see that, no matter why share voltage set, all can't meet each pixel region 130a in the display panel 130,130b ..., this measure will cause the glimmer situation of (flicker) of display frame.In addition, when the size of display panels 130 was big more, the resistance capacitance late effect will be serious more, and then make the problem of flicker more be difficult to solve.
Summary of the invention
The present invention provides a kind of gamma adjustment circuit, and it is applied in the display, with the scintillation of the display frame that improves display.
The present invention provides a kind of display, and its scintillation can be improved.
The present invention proposes a kind of gamma adjustment circuit, and wherein gamma adjustment circuit is suitable for being disposed on the printed-wiring board (PWB).Gamma adjustment circuit comprises a plurality of first partial pressure unit, and these first partial pressure unit are serially connected with between one first reference voltage and one second reference voltage.In addition, each first partial pressure unit comprises one first reference resistance and one first impedance adjustment element, and wherein first impedance adjustment element electrically connects first reference resistance.First impedance adjustment element is in order to the equiva lent impedance of first partial pressure unit of adjusting its place, and one of them first impedance adjustment element is one first adjustment resistance, and remaining first impedance adjustment element is respectively one first lead.
The present invention proposes a kind of display, and this display comprises aforesaid gamma adjustment circuit, a driving element and a display panel.Gamma adjustment circuit is suitable for being disposed on the printed-wiring board (PWB) that electrically connects with driving element, and driving element is electrically connected between display panel and the gamma adjustment circuit.
In an embodiment of display of the present invention and gamma adjustment circuit, each the first partial pressure unit dividing potential drop, first reference voltage and second reference voltage are exported one first gamma reference voltage with correspondence.In one embodiment, at least one first partial pressure unit that comprises the first adjustment resistance, the node between the first adjustment resistance and first reference resistance produces one first gamma adjustment voltage.
In an embodiment of display of the present invention and gamma adjustment circuit, gamma adjustment circuit also comprises a plurality of second partial pressure unit, and these second partial pressure unit are serially connected with between aforesaid first partial pressure unit and second reference voltage.In addition, each second partial pressure unit comprises one second reference resistance and one second impedance adjustment element, and wherein second impedance adjustment element electrically connects second reference resistance.Second impedance adjustment element is in order to the equiva lent impedance of second partial pressure unit of adjusting its place, and one of them second impedance adjustment element is one second adjustment resistance, and remaining second impedance adjustment element is respectively one second lead.
In an embodiment of display of the present invention and gamma adjustment circuit, each the second partial pressure unit dividing potential drop, first reference voltage and second reference voltage are exported one second gamma reference voltage with correspondence.In one embodiment, at least one second partial pressure unit that comprises the second adjustment resistance, the node between the second adjustment resistance and second reference resistance produces one second gamma adjustment voltage.
In an embodiment of gamma adjustment circuit of the present invention, each first partial pressure unit also comprises one first electric capacity of voltage regulation, and wherein first electric capacity of voltage regulation is electrically connected between first gamma reference voltage and second reference voltage.
In an embodiment of gamma adjustment circuit of the present invention, each second partial pressure unit also comprises one second electric capacity of voltage regulation, and wherein second electric capacity of voltage regulation is electrically connected between second gamma reference voltage and second reference voltage.
In an embodiment of display of the present invention; Driven unit comprises the one source pole driver element, and wherein the source drive unit receives first gamma reference voltage, at least one first gamma adjustment voltage, second gamma reference voltage and at least one second gamma adjustment voltage.
Based on above-mentioned, display of the present invention disposes gamma adjustment circuit of the present invention, and wherein gamma adjustment circuit helps to improve the phenomenon that flicker takes place display panel, and then promotes the display quality of display.
Description of drawings
Figure 1A illustrates on the part of known a kind of LCD and looks synoptic diagram.
Figure 1B is the drive waveforms figure according to the display panels of 1A among the figure.
Fig. 2 is the local equivalent circuit diagram of a kind of gamma adjustment circuit of one embodiment of the invention.
Fig. 3 looks synoptic diagram on the part for a kind of display of one embodiment of the invention.
Fig. 4 illustrates the drive waveforms figure of the display panel of one embodiment of the invention.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and cooperates appended graphic elaborating as follows.
[embodiment]
Prior art by Figure 1A and Figure 1B disclosed is learnt; Sweep trace 132 in the LCD 100 is in the process of transmission sweep signal, and pixels in different positions zone 130a, 130b can receive the influence of resistance capacitance late effect (RC delay) thereby have feed-trough voltage (feed-throughvoltage) the Δ V of non-equivalence
FTA, Δ V
FTB, make share voltage V
ComACan't meet pixel region 130b of B place or share voltage V
ComBCan't meet the pixel region 130a of A place, and then make display frame generation scintillation.
In order to improve the problems referred to above; The partial pressure unit (holding the back details) that present embodiment sees through in the adjustment gamma adjustment circuit is exported gamma adjustment voltage (holding the back details) to the part source electrode drive circuit; To adjust the data voltage that these source electrode drive circuits are provided; And then the pixel voltage in the pixel region of adjustment and the electric connection of these source electrode drive circuits, and reach the effect that share voltage can roughly meet each pixel region.
Fig. 2 is the local equivalent circuit diagram of a kind of gamma adjustment circuit of one embodiment of the invention.Please with reference to Fig. 2; The gamma adjustment circuit 200 of present embodiment is suitable for being disposed at a printed-wiring board (PWB) (Printed WireBoard; PWB does not illustrate) on, wherein gamma adjustment circuit 200 comprise a plurality of partial pressure unit 210a, 210b ... and a plurality of partial pressure unit 220a, 220b .... Partial pressure unit 210a, 210b ... and partial pressure unit 220a, 220b ... be serially connected with one first reference voltage V
REF1And one second reference voltage V
REF2Between, wherein partial pressure unit 220a, 220b ... be serially connected with partial pressure unit 210a, 210b ... and the second reference voltage V
REF2Between.
In the present embodiment, the first reference voltage V
REF1With the second reference voltage V
REF2For example be respectively system voltage and ground voltage, and partial pressure unit 210a, 210b ... with partial pressure unit 220a, 220b ... can the common dividing potential drop first reference voltage V
REF1And the second reference voltage V
REF2, with further corresponding output one gamma reference voltage V
GAMi, wherein i is the integer more than or equal to 1.That is to say, partial pressure unit 210a, 210b ... with 220a, 220b ... be serially connected with first, second reference voltage V
REF2, V
REF1Between can make the dividing point between two adjacent partial pressure unit that gamma reference voltage V is provided respectively
GAMiIn the present embodiment, i for example is 1 to 14 positive integer, and also promptly, the gamma reference voltage of present embodiment is V
GAM1～V
GAM14Yet the present invention is not as limit, and gamma reference voltage V
GAMiNumber should look actual product and decide.
Hold above-mentioned, if desire to keep each gamma reference voltage V
GAMiMagnitude of voltage, can be further in partial pressure unit 210a, 210b ... with partial pressure unit 220a, 220b ... in an electric capacity of voltage regulation C is set
R, electric capacity of voltage regulation C wherein
RBe electrically connected at gamma reference voltage V
GAMi(V for example
GAM1, V
GAM2... or V
GAM14) and the second reference voltage V
REF2Between.
It should be noted that the source electrode drive circuit in the general display can be electrically connected between the gamma adjustment circuit 200 of display panel and present embodiment, and gamma adjustment circuit 200 can provide gamma reference voltage V
GAMi(V for example
GAM1～V
GAM14) to source electrode drive circuit, so that source electrode drive circuit provides display panel required data voltage.In addition, the partial pressure unit 210a of present embodiment, 210b ... required gamma reference voltage V in the time of can providing positive polarity to drive
GAMi(V for example
GAM1～V
GAM7), and partial pressure unit 220a, 220b ... required gamma reference voltage V in the time of can providing negative polarity to drive
GAMi(V for example
GAM8～V
GAM14).
In the present embodiment; Each partial pressure unit 210a, 210b ... comprise a reference resistance 212 and the impedance adjustment element 214 that electrically connects with reference resistance 212, and each partial pressure unit 220a, 220b ... comprise a reference resistance 222 and the impedance adjustment element 224 that electrically connects with reference resistance 222.In addition, in the present embodiment, impedance adjustment element 214 one of them is an adjustment resistance at least, remaining impedance adjustment element 214 then is respectively a lead; Likewise, impedance adjustment element 224 one of them is an adjustment resistance at least, remaining impedance adjustment element 224 then is respectively a lead.
For instance; As shown in Figure 2; Impedance among partial pressure unit 210b adjustment element 214 for example is adjustment resistance 214R, and the adjustment of the impedance among partial pressure unit 220b element 224 for example is adjustment resistance 224R, and other impedance adjustment element 214,224 for example is respectively lead 214W, 224W.
In the present embodiment, impedance adjustment element 214 mainly be the partial pressure unit 210a that is used for adjusting its place, 210b ... equiva lent impedance, and impedance adjustment element 224 mainly be the partial pressure unit 220a that is used for adjusting its place, 220b ... equiva lent impedance.Particularly, for regard to the partial pressure unit 210a of lead 214W, the equivalent impedance of partial pressure unit 210a is essentially the resistance value of reference resistance 212 with regard to impedance adjustment element 214.On the other hand, for regard to the partial pressure unit 210b of adjustment resistance 214R, the equiva lent impedance of partial pressure unit 210b can be considered reference resistance 212 and both common impedances that produce of adjustment resistance 214R with regard to impedance adjustment element 214.In like manner, the equivalent impedance of partial pressure unit 220a is essentially the resistance value of reference resistance 222, and the equiva lent impedance of partial pressure unit 220b can be considered reference resistance 222 and both common impedances that produce of adjustment resistance 224R.
So in partial pressure unit 210b, adjustment resistance 214R also can pass through the dividing potential drop first reference voltage V
REF1And the second reference voltage V
REF2Come further to make the node between adjustment resistance 214R and the reference resistance 212 to be able to produce gamma adjustment voltage V
GAM_C1In like manner, in partial pressure unit 220b, the node between adjustment resistance 224R and the reference resistance 222 also can produce another gamma adjustment voltage V
GAM_C2
Need to prove that at this present embodiment for example is that adjustment resistance 214R, 224R are disposed among partial pressure unit 210b, the 220b, so that partial pressure unit 210b, 220b are able to provide gamma adjustment voltage V
GAM_C1, V
GAM_C2Yet the present invention is not as limit.For instance, the configuration of adjustment resistance also can be configured in another or other a plurality of partial pressure unit, so that another partial pressure unit or other a plurality of partial pressure unit are able to provide gamma adjustment voltage.
Special one what carry is the gamma adjustment circuit 200 of present embodiment to be applied in the display, then the gamma adjustment voltage V that exported of gamma adjustment circuit 200 at this
GAM_C1, V
GAM_C2Can see through source electrode drive circuit and adjust the required data voltage of display panel, and then the phenomenon that flicker takes place in display frame is improved, wherein V
GAM_C1, V
GAM_C2Be respectively the positive and negative polarity gamma adjustment voltage when driving.In following embodiment, at first the general architecture of the display of the gamma adjustment circuit 200 of explanation application present embodiment is further inquired into the scintillation how gamma adjustment circuit 200 improves display frame again.
Fig. 3 looks synoptic diagram on the part for a kind of display of one embodiment of the invention.Please with reference to Fig. 3, the display 500 of present embodiment comprises a gamma adjustment circuit 200, a display panel 300 and a driving element 400.Wherein, Gamma adjustment circuit 200 is suitable for being configured on the printed-wiring board (PWB) (not illustrating) that electrically connects with driving element 400; Driving element 400 is electrically connected between gamma adjustment circuit 200 and the display panel 300, and display panel 300 for example is a display panels.
On the other hand, the driving element 400 of present embodiment is drawn together source electrode drive circuit 410 and gate driver circuit 420, and electrically connects above-mentioned printed-wiring board (PWB).Say that further the source electrode drive circuit 410 of present embodiment electrically connects printed-wiring board (PWB), and electrically connect with the gamma adjustment circuit 200 that is disposed on this printed-wiring board (PWB).Certainly, the display 500 of present embodiment also can comprise other parts (component) again.With penetrating LCD or half penetrated half-reflecting display is example, and display 500 can further be provided with backlight module (not illustrating).In brief, Fig. 3 only illustrates associated components, describes among the following embodiment being convenient to.
In the present embodiment; Display panel 300 comprise many parallel data line 310a, 310b ..., many parallel sweep traces 322,324 ... and a plurality of pixel region 330a, 330b ..., wherein data line 310a, 310b ... and sweep trace 322,324 ... intersect each other and define pixel region 330a, 330b ....In addition, data line 310a, 310b ... electrically connect source electrode drive circuit 410, and sweep trace 322,324 ... electrically connect gate driver circuit 420.
And then say it, the source electrode drive circuit 410 of present embodiment for example be by source drive unit 410a, 410b ... constitute.More specifically, the source drive unit 410a of present embodiment electrically connects data line 310a, and receives gamma reference voltage V
GAMiAnd gamma adjustment voltage V
GAM_C1, V
GAM_C2So that pixel region 310a to be provided required data voltage; In addition, the source drive unit 410b of present embodiment electrically connects data line 310b, and receives gamma reference voltage V
GAMiSo that pixel region 310b to be provided required data voltage.So, the configuration relation of other data line and source drive unit is not added to give unnecessary details at this by that analogy.
Fig. 4 is the drive waveforms figure according to the display panel among Fig. 3, wherein V
GFor example be the sweep signal that gate driver circuit 420 is provided, V
GA, V
GBFor example be respectively the sweep signal that sweep trace 322 transmits in A, B two places, V
DA, V
DBFor example be respectively data line 310a, the last data voltage of 310b, V
PA2, V
PB2It for example is respectively the pixel voltage in pixel region 330a, the 330b.
In the present embodiment, display 500 is in the picture frame time T
+Interior is that positive polarity drives, and in the picture frame time T
-Interior is that negative polarity drives.In detail, in the picture frame time T
+In time t
1In, gate driver circuit 420 provides sweep signal V
GSweep trace 322 to the display panel 300, wherein sweep signal V
GWaveform when reaching the pixel region 330a of A place for example is and sweep signal V
GIdentical sweep signal V
GA, but the waveform when reaching the pixel region 330b of B place then because of the distortion of resistance capacitance late effect for and sweep signal V
GThe sweep signal V that difference is very big
GBLikewise, in the picture frame time T
-In time t
2In, gate driver circuit 420 also provides sweep signal V
GTo sweep trace 322, the sweep signal waveform when wherein reaching the pixel region 330a of A place for example is V
GA, but the sweep signal waveform when reaching the pixel region 330b of B place for example is sweep signal V
GB
In order to improve pixel region 330a of A place and the pixel region 330b of B place because of receiving sweep signal V respectively
GAWith sweep signal V
GBInfluence and have feedthrough effect in various degree respectively, the pixel region 330a of present embodiment and pixel region 330b receive the data voltage V of non-equivalence respectively
DAWith data voltage V
DB, to improve scintillation.Yet present embodiment is to see through gamma adjustment circuit 200 gamma reference voltage V is provided
GAMiAnd gamma adjustment voltage V
GAM_C1, V
GAM_C2So that source drive unit 410a output data voltage V
DATo pixel region 330a, gamma reference voltage V is provided and see through gamma adjustment circuit 200
GAMiSo that source drive unit 410b output data voltage V
DBTo pixel region 330b.
It should be noted that gamma adjustment voltage V
GAM_C1, V
GAM_C2Formation be the partial pressure unit 210b that sees through adjustment gamma adjustment circuit 200, the equiva lent impedance among the 220b, wherein gamma is adjusted voltage V
GAM_C1, V
GAM_C2Can effectively improve the scintillation of a certain GTG contrast of display frame.Yet, the present invention and unrestricted gamma adjustment voltage V
GAM_C1, V
GAM_C2Need to produce by partial pressure unit 210b, 220b; The visual product demand of deviser (for example the highest, minimum gray scale contrast or middle GTG contrast) is come the equiva lent impedance in the corresponding adjustment partial pressure unit, and wherein the method for the corresponding adjustment of present embodiment equiva lent impedance is that the impedance adjustment element of correspondence is set to adjust resistance.
With the prior art that Fig. 1 was disclosed is example, and the pixel region 130a at A, B two places, the feed-trough voltage of 130b are respectively Δ V
FTA, Δ V
FTBIn the present embodiment, for example be feed-trough voltage Δ V according to these two non-equivalences
FTA, Δ V
FTBData voltage V is provided
DA, V
DB, to improve the scintillation of display frame.
In detail, the pixel region 330a of A place receives the data voltage V on the data line 310a
DA, and the pixel region 330b of B place receives the data voltage V on the data line 310b
DB, data voltage V wherein
DAMagnitude of voltage for example greater than data voltage V
DBMagnitude of voltage, and data voltage V
DAMagnitude of voltage and data voltage V
DBBoth voltage differences of magnitude of voltage be substantially equal to feed-trough voltage Δ V
FTAWith feed-trough voltage Δ V
FTBBoth differences | Δ V
FTA-Δ V
FTB|.
Hold above-mentioned, as time t
1During end, data voltage V
DAReceive sweep signal V
GASwitch to the influence of low level and make pixel voltage drop to V from high levle
P+, data voltage V
DBAlso receive sweep signal V
GBSwitch to the influence of low level and make pixel voltage drop to V from high levle
P+In like manner, as time t
2During end, data voltage V
DAReceive sweep signal V
GASwitch to the influence of low level and make pixel voltage drop to V from high levle
P-, data voltage V
DBAlso receive sweep signal V
GBSwitch to the influence of low level and make pixel voltage drop to V from high levle
P-In brief, in the picture frame time T
+In, pixel region 330a and 330b have equivalent pixel voltage V
P+And in the picture frame time T
-In, pixel region 330a and 330b also have equivalent pixel voltage V
P-
So, at time t
1After the end, though pixel region 330a and pixel region 330b receive feedthrough effect in various degree respectively thereby have different feed-trough voltage Δ V
FTAAnd feed-trough voltage Δ V
FTB, but pixel region 330a, 330b have identical pixel voltage V
P+Same reason is at time t
2After the end, pixel region 330a, 330b also have identical pixel voltage V
P-Thus, the share voltage of present embodiment just can be set in pixel voltage V
P+With pixel voltage V
P-Intermediate value V
Com
From the above, present embodiment utilizes gamma adjustment circuit 200 that gamma adjustment voltage V is provided
GAM_C1, V
GAM_C2To source drive unit 410a but the 410b to the source drive unit is not provided, the data voltage V that is received with adjustment pixel region 310a
DAAnd make feed-trough voltage Δ V
FTAWith Δ V
FTBDifference between the two obtains compensation, and then makes share voltage V
ComCan roughly meet all pixel region 310a, 310b ....
Traditionally, gamma adjustment circuit only can provide gamma reference voltage V
GAMi, thereby make the non-equivalence feed-trough voltage in different pixels zone can't obtain compensation, and then make display frame that the phenomenon of flicker take place.
Need to prove that at this foregoing description is with gamma adjustment circuit 200 gamma adjustment voltage V to be provided
GAM_C1, V
GAM_C1To the source drive unit 410a that electrically connects with pixel region 330a but do not provide to the source drive unit 410b that electrically connects with pixel region 330b be example, and the method is not just as changing the data voltage V of pixel region 330b
DBSituation under with the data voltage V of pixel region 330a
DAImprove | Δ V
FTA-Δ V
FTB|, and then make pixel region 330a, 330b have identical pixel voltage V
P+, V
P-
Yet in other embodiments, gamma adjustment circuit 200 also can provide gamma adjustment voltage V
GAM_C1, V
GAM_C1To the source drive unit 410b that electrically connects with pixel region 330b but do not provide to the source drive unit 410a that electrically connects with pixel region 330a, not change the data voltage V of pixel region 330a
DASituation under with the data voltage V of pixel region 330b
DBReduce | Δ V
FTA-Δ V
FTB|, and then make pixel region 330a, 330b have identical pixel voltage V
P+, V
P-
Broad sense more when the resistance capacitance effect in the display panel 300 is very serious, can be fixed the data voltage of arbitrary place pixel region, calculates the difference of feed-trough voltage of feed-trough voltage and other pixel region of this pixel region again.So, just can see through this difference and compensate,, and then improve the flicker situation of display frame so that the share voltage of all pixel regions in the display panel 300 is roughly the same to the data voltage of other pixel region.
In sum; Gamma adjustment circuit of the present invention is applied in the display of the present invention; Wherein gamma adjustment circuit can effectively improve the scintillation of display frame, and the adjustment impedance adjustment element of the correspondence in the comparatively serious viewing area of the scintillation agate adjustment also capable of using circuit equiva lent impedance of adjusting partial pressure unit is significantly improved obtaining.Generally speaking, display of the present invention has superior display quality.
Though the present invention discloses as above with embodiment; Right its is not in order to limit the present invention; Has common knowledge the knowledgeable in the technical field under any; Do not breaking away from the spirit and scope of the present invention, when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (8)
1. a gamma adjustment circuit is suitable for being disposed on the printed-wiring board (PWB), it is characterized in that, this gamma adjustment circuit comprises:
A plurality of first partial pressure unit; Be serially connected with between one first reference voltage and one second reference voltage; Respectively this this first reference voltage of first partial pressure unit dividing potential drop and this second reference voltage are exported one first gamma reference voltage with correspondence, and each this first partial pressure unit comprises:
One first reference resistance; And
One first impedance adjustment element electrically connects this first reference resistance, in order to the equiva lent impedance of this first partial pressure unit of adjusting its place,
Wherein, At least one of them is one first adjustment resistance to those first impedance adjustment elements; Remaining those first impedance adjustment element is respectively one first lead; In this at least one first partial pressure unit that comprises this first adjustment resistance, the node between this first adjustment resistance and this first reference resistance produces one first gamma adjustment voltage.
2. gamma adjustment circuit as claimed in claim 1 is characterized in that, each this first partial pressure unit also comprises:
One first electric capacity of voltage regulation is electrically connected between this first gamma reference voltage and this second reference voltage.
3. gamma adjustment circuit as claimed in claim 1 is characterized in that, also comprises:
A plurality of second partial pressure unit; Be serially connected with between those first partial pressure unit and this second reference voltage; Respectively this this first reference voltage of second partial pressure unit dividing potential drop and this second reference voltage are exported one second gamma reference voltage with correspondence, and each this second partial pressure unit comprises:
One second reference resistance; And
One second impedance adjustment element electrically connects this second reference resistance, in order to the equiva lent impedance of this second partial pressure unit of adjusting its place,
Wherein, At least one of them is one second adjustment resistance to those second impedance adjustment elements; Remaining those second impedance adjustment element is respectively one second lead; In this at least one second partial pressure unit that comprises this second adjustment resistance, the node between this second adjustment resistance and this second reference resistance produces one second gamma adjustment voltage.
4. gamma adjustment circuit as claimed in claim 3 is characterized in that, each this second partial pressure unit also comprises:
One second electric capacity of voltage regulation is electrically connected between this second gamma reference voltage and this second reference voltage.
5. a display is characterized in that, comprising:
One gamma adjustment circuit is suitable for being disposed on the printed-wiring board (PWB), and this gamma adjustment circuit comprises:
A plurality of first partial pressure unit; Be serially connected with between one first reference voltage and one second reference voltage; Respectively this this first reference voltage of first partial pressure unit dividing potential drop and this second reference voltage are exported one first gamma reference voltage with correspondence, and wherein each this first partial pressure unit comprises:
One first reference resistance; And
One first impedance adjustment element electrically connects this first reference resistance, in order to the equiva lent impedance of this first partial pressure unit of adjusting its place,
Wherein, At least one of them is one first adjustment resistance to those first impedance adjustment elements; Remaining those first impedance adjustment element is respectively one first lead; In this at least one first partial pressure unit that comprises this first adjustment resistance, the node between this first adjustment resistance and this first reference resistance produces one first gamma adjustment voltage;
One driving element electrically connects this printed-wiring board (PWB); And
One display panel, this driving element are electrically connected between this display panel and this gamma adjustment circuit.
6. display as claimed in claim 5 is characterized in that this driving element comprises the one source pole driver element, and this source drive unit receives those first gamma reference voltages and this at least one first gamma adjustment voltage.
7. display as claimed in claim 5 is characterized in that, this gamma adjustment circuit also comprises:
A plurality of second partial pressure unit; Be serially connected with between those first partial pressure unit and this second reference voltage; Respectively this this first reference voltage of second partial pressure unit dividing potential drop and this second reference voltage are exported one second gamma reference voltage with correspondence, and each this second partial pressure unit comprises:
One second reference resistance; And
One second impedance adjustment element electrically connects this second reference resistance, in order to the equiva lent impedance of this second partial pressure unit of adjusting its place,
Wherein, At least one of them is one second adjustment resistance to those second impedance adjustment elements; Remaining those second impedance adjustment element is respectively one second lead; In this at least one second partial pressure unit that comprises this second adjustment resistance, the node between this second adjustment resistance and this second reference resistance produces one second gamma adjustment voltage.
8. display as claimed in claim 7 is characterized in that this driving element comprises the one source pole driver element, and this source drive unit receives those second gamma reference voltages and this at least one second gamma adjustment voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910051696XA CN101893773B (en) | 2009-05-21 | 2009-05-21 | Display and gamma adjustment circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910051696XA CN101893773B (en) | 2009-05-21 | 2009-05-21 | Display and gamma adjustment circuit thereof |
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| Publication Number | Publication Date |
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| CN101893773A CN101893773A (en) | 2010-11-24 |
| CN101893773B true CN101893773B (en) | 2012-05-02 |
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| CN200910051696XA Expired - Fee Related CN101893773B (en) | 2009-05-21 | 2009-05-21 | Display and gamma adjustment circuit thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103544927B (en) * | 2013-11-07 | 2015-07-22 | 京东方科技集团股份有限公司 | Display drive circuit, display device and display drive method |
| CN103745695B (en) * | 2013-12-02 | 2016-03-30 | 深圳市华星光电技术有限公司 | Gamma Voltag driving circuit, source drive module and liquid crystal panel |
| CN104464627A (en) | 2014-12-17 | 2015-03-25 | 昆山国显光电有限公司 | Active matrix organic light emitting display and control method thereof |
| US10832627B2 (en) * | 2016-07-14 | 2020-11-10 | Novatek Microelectronics Corp. | Display apparatus and source driver thereof and operating method |
| CN108986731B (en) * | 2018-08-07 | 2021-10-08 | 京东方科技集团股份有限公司 | Display panel, compensation method thereof and display device |
| CN111402830A (en) * | 2020-04-20 | 2020-07-10 | 合肥京东方显示技术有限公司 | Circuit board for signal transmission, display device and driving method thereof |
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| CN101893773A (en) | 2010-11-24 |
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