CN101866628A - Display driving circuit and method for regulating output brightness of display - Google Patents
Display driving circuit and method for regulating output brightness of display Download PDFInfo
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- CN101866628A CN101866628A CN200910135513A CN200910135513A CN101866628A CN 101866628 A CN101866628 A CN 101866628A CN 200910135513 A CN200910135513 A CN 200910135513A CN 200910135513 A CN200910135513 A CN 200910135513A CN 101866628 A CN101866628 A CN 101866628A
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Abstract
The invention provides a display driving circuit and a method for regulating the output brightness of a display, which particularly relate to a display driving circuit used for driving at least one pixel. The display driving circuit comprises an output stage, a regulating and calibrating device, a stabilizing device and an accelerating device, wherein the output stage is coupled with the pixels and is controlled by a pixel signal so as to enable the output voltage of the pixels to be switched between a high level and a low level; the regulating and calibrating device is coupled between the output stage and the pixels and comprises an input end, and the input end is controlled by bias voltage and is used for regulating the equivalent resistance value of the regulating and calibrating device so as to calibrate the display brightness of the pixels; the stabilizing device is coupled with the input end of the regulating and calibrating device and is used for enabling the voltage level of the input end of the regulating and calibrating device to be restored to the bias voltage after being changed; and the accelerating device is coupled between the stabilizing device and a voltage source, is used for generating the bias voltage and enables the voltage level of the input end of the regulating and calibrating device to be restored to the bias voltage in an accelerating way. By the invention, the displaying of the brightness of a display can be more stable.
Description
Technical field
The present invention is about display, particularly the driving circuit of display.
Background technology
Fig. 1 is the synoptic diagram according to the circuit of display driving of prior art.Driving circuit 100 comprises pixel 102 and in order to drive the output stage 104 of pixel 102.The output stage 104 of driving circuit 100 comprises a p type metal oxide semiconductor field effect transistor (p-type-MOSFET) 112 and a n type metal oxide semiconductor field effect transistor (n-type-MOSFET) 114 again, and two transistor 112 and 114 comprises that respectively a grid is coupled to this picture element signal S
pAnd accept its control, make the output voltage V on this pixel 102
OutSwitch on high pressure V
HAnd low pressure (ground voltage) V
GNDBetween and open or close.
Put on the output voltage V on the pixel 102
OutOften influence the brightness of pixel, yet the character of display itself can cause also picture brightness slight variations to occur.(carbon nanotube display CNDP) is example, and based on the characteristic of itself, carbon nanotube display often causes brightness cumulative because of aging with carbon nanotube display.At above-mentioned situation, driving circuit 100 must comprise that a calibration apparatus 130 is to reach the purpose of adjusting display brightness.For example, this calibration apparatus 130 is p type metal oxide semiconductor field effect transistor T among Fig. 1
1With n type metal oxide semiconductor field effect transistor T
2Formed transmission gate is accepted a bias voltage V
BiasControl and adjust the equivalent resistance of this calibration apparatus 130, and then calibrate the display brightness of this pixel 102.
Yet, it should be noted that because transistor T
1Coupling effect (there are coupling capacitance in grid and drain interpolar) itself makes output voltage V on the pixel 102
OutInfluence bias voltage V conversely
Bias, as shown in Figure 2.The output voltage V on the pixel 102 wherein
OutWith picture element signal S
pAnd change between two voltage levels.Work as output voltage V
OutBy low pressure V
GNDSwitch to high pressure V
HThe time, can make bias voltage V
BiasVoltage skyrocket and produce a surging P
1And work as output voltage V
OutBy high pressure V
HSwitch to low pressure V
GNDThe time, then can make bias voltage V
BiasVoltage sharp fall and produce another surging P
2Moreover, because the driving circuit 100 of display is a high-tension unit, and operate in the high pressure V on the pixel 102
H, for example, can be up to 110 volts, make bias voltage V
BiasBecause of becoming, surging that above-mentioned coupling effect produced can not ignore.In case bias voltage V
BiasChange, the equivalent resistance of this calibration apparatus 130 also change thereupon, and then cause display picture unsettled phenomenons such as glimmering, beat to occur.
In order to solve the above problems, driving circuit 100 comprises a stabilising arrangement 140 again, and it is coupled to the input end A of this calibration apparatus 130, in order to suppress this bias voltage V
BiasIn because of this output voltage V
OutVoltage level switch the surging produced, even the voltage level of this input end A of meaning calibration apparatus can return to this bias voltage V after through change
BiasFor example, this stabilising arrangement 140 can comprise this voltage pull device 141, this voltage drawing upwardly device 142 and this bias voltage transmitting device 143.Fig. 3 A represents output voltage V
OutThe waveform sequential chart, Fig. 3 B then is aforementioned stable device 140 corresponding output voltage V
OutThe waveform sequential chart that is produced.Among Fig. 3 B, the 1st section, the 2nd section and the 3rd section of sequential is caused by this voltage pull device 141, this bias voltage transmitting device 143 and this voltage drawing upwardly device 142 respectively.The 1st section of sequential, voltage level is left behind to ground voltage V
GNDIn the hope of with Fig. 2 in surging P
1Offset, at the 2nd section, voltage level returns to desirable V
Bias, and at the 3rd section, voltage level is pulled on to V
HIn the hope of with Fig. 2 in surging P
2Offset.
Yet from Fig. 3 B as can be known, this stabilising arrangement 140 is not good at the 2nd of sequential the intersegmental action effect, mainly is because above-mentioned bias voltage transmitting device 143 charging rates reason slowly.Therefore, if there is device can improve this phenomenon, can make the brightness performance of display more stable.
Summary of the invention
The invention provides a kind of circuit of display driving, in order to drive at least one pixel, this circuit of display driving comprises: an output stage is coupled to this pixel, and is subjected to picture element signal control so that this pixel output voltage switches between a high level and the low level; One calibration apparatus is coupled between this output stage and this pixel, comprises an input end, and this input end is adjusted the equivalent resistance of this calibration apparatus to calibrate the display brightness of this pixel in order to the control of accepting a bias voltage; One stabilising arrangement is coupled to this input end of this calibration apparatus, with so that the voltage level of this input end of this calibration apparatus can return to this bias voltage after through change; And an accelerator, be coupled between this stabilising arrangement and the voltage source, in order to producing this bias voltage, and make the voltage level of this input end of this calibration apparatus quicken to return to this bias voltage.
Circuit of display driving of the present invention, this accelerator also comprises a compensation system, in order to compensate this bias voltage when this bias voltage and a benchmark bias voltage are inconsistent.
Circuit of display driving of the present invention, this compensation system comprises: a first transistor, this first transistor comprises: a first grid, in order to receive this benchmark bias voltage; One first drain electrode is coupled to one first high pressure spot; And one first source electrode, be coupled to this stabilising arrangement and this bias voltage.
Circuit of display driving of the present invention, this benchmark bias voltage is provided by a benchmark bias voltage generation device, and this benchmark bias voltage generation device comprises: a transistor seconds, this transistor seconds comprises: a second grid is coupled to this voltage source; One second source electrode is coupled to one first low pressure point; And one second the drain electrode, in order to this benchmark bias voltage to be provided; And one first resistance, be coupled between one second high pressure spot and this second drain electrode.
Circuit of display driving of the present invention, this accelerator comprise a bias voltage generation device, are biased into this stabilising arrangement in order to this to be provided.
Circuit of display driving of the present invention, this bias voltage generation device also comprises: one the 3rd transistor, the 3rd transistor comprises: one the 3rd grid is coupled to this voltage source; One the 3rd source electrode is coupled to one second low pressure point; And one the 3rd the drain electrode, in order to this bias voltage to be provided; And one second resistance, be coupled between one the 3rd high pressure spot and the 3rd drain electrode.
Circuit of display driving of the present invention, this first resistance is identical with the resistance of this second resistance, and this transistor seconds and the 3rd transistor are complementary.
Circuit of display driving of the present invention, this second high pressure spot i.e. the 3rd high pressure spot, and i.e. this second low pressure point of this first low pressure point.
Circuit of display driving of the present invention, this first transistor, this transistor seconds and the 3rd transistor are all n type metal oxide semiconductor field effect transistor.
Circuit of display driving of the present invention, this stabilising arrangement comprise a voltage pull device, in order to when this output voltage switches to this high level by this low level the voltage of this bias voltage is dragged down.
Circuit of display driving of the present invention, this stabilising arrangement also comprise a voltage drawing upwardly device, in order to when this output voltage switches to this low level by this high level the voltage of this bias voltage is drawn high.
Circuit of display driving of the present invention, this stabilising arrangement comprise a bias voltage transmitting device, are coupled between this calibration apparatus and this accelerator, in order to this bias voltage is transferred to this input end of this calibration apparatus.
Circuit of display driving of the present invention, this display are a carbon nanotube display.
The present invention provides the method for the output brightness of adjusting display in addition, comprise configuration one output stage, wherein this output stage is coupled at least one pixel of a display, and this output stage is accepted picture element signal control so that the output voltage on this pixel switches between a high pressure and the low pressure; Dispose a calibration apparatus between this output stage and this pixel; Apply an input end that is biased in this calibration apparatus and calibrate the display brightness of this pixel with the equivalent resistance of adjusting this calibration apparatus; Make the voltage level of this input end of this calibration apparatus after through change, can return to this bias voltage; And make the voltage level of this input end of this calibration apparatus quicken to return to this bias voltage.
The present invention can improve bias voltage transmitting device charging rate phenomenon slowly, makes the brightness performance of display more stable.
Description of drawings
Fig. 1 is the synoptic diagram according to the circuit of display driving of prior art;
Fig. 2 is the synoptic diagram that concerns of bias voltage and output voltage;
Fig. 3 A is the waveform sequential chart of output voltage;
Fig. 3 B is the waveform sequential chart that the corresponding output voltage of stabilising arrangement is produced;
Fig. 4 is a driving circuit synoptic diagram of the present invention;
The waveform sequential chart of Fig. 5 for being produced according to the corresponding output voltage of stabilising arrangement of the present invention;
Fig. 6 is the method flow diagram according to adjustment output brightness of display of the present invention.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, a plurality of preferred embodiments cited below particularly, and cooperate appended diagram, be described in detail below.
Fig. 4 is according to circuit of display driving synoptic diagram of the present invention.Driving circuit 400 of the present invention is in order at least one pixel 402 of driving display, and this circuit of display driving 400 comprises an output stage 404, a calibration apparatus 430 and a stabilising arrangement 440 again.Wherein this output stage 404 is coupled to this pixel 402, is subjected to a picture element signal S
pControl is so that the output voltage V on this pixel
OutSwitch on high pressure V
HAnd low pressure V
GNDBetween; This calibration apparatus 430 is coupled between this output stage 404 and this pixel 402, comprises that also an input end A is in order to accept a bias voltage V
BiasControl and adjust the equivalent resistance of this calibration apparatus 430, and then reach the display brightness purpose of this pixel of calibration.This stabilising arrangement 440 is coupled to this input end A of this calibration apparatus 430, uses so that the voltage level of this input end A of this calibration apparatus 430 can return to this bias voltage V after through change
BiasIn a preferred embodiment of the present invention, this stabilising arrangement 440 also drags down voltage level, voltage level is drawn high and received and transmit this bias voltage V with a bias voltage transmitting device 443 with a voltage drawing upwardly device 442 with a voltage pull device 441
BiasIn order to solve the problems of the prior art, driving circuit 400 of the present invention comprises that also an accelerator 460 is coupled between this stabilising arrangement 440 and the voltage source 470, in order to produce this bias voltage V
Bias, and make the voltage level of this input end A of this calibration apparatus 430 can promptly return to this bias voltage V
BiasAbove-mentioned voltage source 470 is in order to provide input voltage V
In, have numerous embodiments, for example, this voltage source can be by an internal resistance R
InWith non-essential resistance R
ExtSeries connection also is coupled to a voltage V
DDForm, the present invention is not as limit.
Comprise a bias voltage generation device 463 in the accelerator 460 of the present invention, in order to produce this bias voltage V
BiasFor example, this bias voltage generation device 463 can be by a n type metal oxide semiconductor field effect transistor T
3With a resistance R
2Form this transistor T wherein
3Be coupled to this voltage source 470 to receive this input voltage V with grid
In, with the 3rd source electrode be coupled to a low pressure point (for convenience of description, this low pressure point in the present embodiment with this ground voltage V
GNDIdentical, yet in other embodiments needn't be as limit), and provide this bias voltage V of generation with the 3rd drain electrode
BiasGive the input end B of this stabilising arrangement 440.This resistance R
2Then be coupled to a high pressure spot (for convenience of description, this high pressure spot in the present embodiment with this high pressure V
HIdentical, yet in other embodiments needn't be as limit) and this transistor T
3Drain electrode between.Those skilled in the art can be by designing a suitable resistance R
2Produce required bias voltage V easily
Bias
Yet only this bias voltage generation device 463 is not enough to reach and makes bias voltage V
BiasRecover stable effect rapidly, therefore, accelerator 460 of the present invention is still needed and is comprised a compensation system 461, in order to work as this bias voltage V
BiasWith a benchmark bias voltage V
0Compensate this bias voltage V when inconsistent
BiasAccording to the present invention, this benchmark bias voltage V
0No matter supply in which way, all V
0Value all must with uninfluenced before bias voltage V
BiasIdentical and maintenance is stablized.In the present embodiment, this compensation system 461 is a n type metal oxide semiconductor field effect transistor T
1, receive this benchmark bias voltage V with grid
0, with drain electrode be coupled to a high pressure spot (for convenience of description, this high pressure spot in the present embodiment with this high pressure V
HIdentical, yet in other embodiments needn't be as limit), and be coupled to the drain electrode of input end B and this bias voltage generation device 463 of this stabilising arrangement 440 with source electrode.Those skilled in the art as can be known, when this transistor T
1The benchmark bias voltage V that receives of grid
0The bias voltage V that is received with its source electrode
BiasBetween difference surpass this transistor T
1Critical voltage V
TThe time, transistor T
1The high pressure V that drain electrode couples
HCan be at once to this bias voltage V
BiasCharging is reached rapidly with this bias voltage V
BiasThe effect that stabilizes.
In one embodiment, above-mentioned benchmark bias voltage V
0Can be provided by a benchmark bias voltage generation device 462.This benchmark bias voltage generation device 462 can be by a n type metal oxide semiconductor field effect transistor T
2An and resistance R
1Form.This transistor T
2Be coupled to this voltage source 470 to receive this input voltage V with a grid
In, with one source pole be coupled to a low pressure point (for convenience of description, this low pressure point in the present embodiment with this ground voltage V
GNDIdentical, yet in other embodiments needn't be as limit), and provide this benchmark bias voltage V with a drain electrode
0Grid to this compensation system 461.It should be noted that according to the present invention this benchmark bias voltage generation device 462 needs identical with this bias voltage generation device 463, meaning is a transistor T
2And transistor T
3(having identical breadth length ratio) is complementary; Resistance R
1With resistance R
2Resistance also must be identical, and all be coupled to identical high pressure V
HWith low pressure V
GNDBecause benchmark bias voltage generation device 462 is identical with this bias voltage generation device 463, receive input voltage V from voltage source 470
InAfter, all can produce identical voltage respectively at the output terminal of this benchmark bias voltage generation device 462 and the output terminal of this bias voltage generation device 463, by the effect of above-mentioned compensation system 461, the voltage on two output terminals is if there is change also to stablize by instant recovery again.Fig. 5 is these stabilising arrangement 440 corresponding output voltage V behind the use accelerator 460 of the present invention
OutThe waveform sequential chart that is produced compared to Fig. 3 B, is gone up for the 2nd section of sequential and is obviously obtained improvement.
In addition, the present invention provides a kind of method of adjusting the output brightness of display again, and Fig. 6 is the process flow diagram of this method.Please in the lump with reference to Fig. 4, method of the present invention comprises: in step S602, dispose this output stage 404, wherein this output stage 404 is coupled to this pixel 402 at least of this display, and this output stage 404 is accepted this picture element signal S
pControl is so that this output voltage V on this pixel 402
OutSwitch on this high pressure V
HAnd this low pressure V
GNDBetween; In step S604, dispose this calibration apparatus 430 between this output stage 404 and this pixel 402; In step S606, apply this bias voltage V
BiasThis input end in this calibration apparatus 430 is calibrated the display brightness of this pixel 402 with the equivalent resistance of adjusting this calibration apparatus 430; In step S608, make the voltage level of this input end of this calibration apparatus 430 after through change, can return to this bias voltage V
BiasIn step S610, make the voltage level of this input end of this calibration apparatus 430 quicken to return to this bias voltage V at last
Bias
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
100: drive circuit; 102: pixel; 104: output stage; 130: calibration apparatus; 140: stabilising arrangement; 41: the voltage pull device; 142: the voltage drawing upwardly device; 143: the bias voltage transmitting device; 400: drive circuit; 402: pixel; 404: output stage; 430: calibration apparatus; 440: stabilising arrangement; 441: the voltage pull device; 442: the voltage drawing upwardly device; 443: the bias voltage transmitting device; 460: accelerator; 461: compensation arrangement; 462: the benchmark biasing device; 463: the bias voltage generation device; 470: voltage source; A: input; B: input; T1: transistor; T2: transistor; T3: transistor; Sp: picture element signal; R1: resistance; R2: resistance; Rext: resistance; R: resistance; Vin: input voltage; VH: high pressure; VGND: low pressure; Vbias: bias voltage; Vout: output voltage.
Claims (14)
1. a circuit of display driving is characterized in that, in order to drive at least one pixel of a display, this circuit of display driving comprises:
One output stage is coupled to this pixel, and is subjected to picture element signal control so that this pixel output voltage switches between a high level and the low level;
One calibration apparatus is coupled between this output stage and this pixel, comprises an input end, and this input end is adjusted the equivalent resistance of this calibration apparatus to calibrate the display brightness of this pixel in order to the control of accepting a bias voltage;
One stabilising arrangement is coupled to this input end of this calibration apparatus, with so that the voltage level of this input end of this calibration apparatus can return to this bias voltage after through change; And
One accelerator is coupled between this stabilising arrangement and the voltage source, in order to producing this bias voltage, and makes the voltage level of this input end of this calibration apparatus quicken to return to this bias voltage.
2. circuit of display driving according to claim 1 is characterized in that this accelerator also comprises a compensation system, in order to compensate this bias voltage when this bias voltage and a benchmark bias voltage are inconsistent.
3. circuit of display driving according to claim 2 is characterized in that, this compensation system comprises:
One the first transistor, this first transistor comprises:
One first grid is in order to receive this benchmark bias voltage;
One first drain electrode is coupled to one first high pressure spot; And
One first source electrode is coupled to this stabilising arrangement and this bias voltage.
4. circuit of display driving according to claim 2 is characterized in that, this benchmark bias voltage is provided by a benchmark bias voltage generation device, and this benchmark bias voltage generation device comprises:
One transistor seconds, this transistor seconds comprises:
One second grid is coupled to this voltage source;
One second source electrode is coupled to one first low pressure point; And
One second drain electrode is in order to provide this benchmark bias voltage; And
One first resistance is coupled between one second high pressure spot and this second drain electrode.
5. circuit of display driving according to claim 4 is characterized in that, this accelerator comprises a bias voltage generation device, is biased into this stabilising arrangement in order to this to be provided.
6. circuit of display driving according to claim 5 is characterized in that, this bias voltage generation device also comprises:
One the 3rd transistor, the 3rd transistor comprises:
One the 3rd grid is coupled to this voltage source;
One the 3rd source electrode is coupled to one second low pressure point; And
One the 3rd drain electrode is in order to provide this bias voltage; And
One second resistance is coupled between one the 3rd high pressure spot and the 3rd drain electrode.
7. circuit of display driving according to claim 6 is characterized in that, this first resistance is identical with the resistance of this second resistance, and this transistor seconds and the 3rd transistor are complementary.
8. circuit of display driving according to claim 6 is characterized in that, this second high pressure spot i.e. the 3rd high pressure spot, and i.e. this second low pressure point of this first low pressure point.
9. circuit of display driving according to claim 6 is characterized in that, this first transistor, this transistor seconds and the 3rd transistor are all n type metal oxide semiconductor field effect transistor.
10. circuit of display driving according to claim 1 is characterized in that, this stabilising arrangement comprises a voltage pull device, in order to when this output voltage switches to this high level by this low level the voltage of this bias voltage is dragged down.
11. circuit of display driving according to claim 1 is characterized in that, this stabilising arrangement also comprises a voltage drawing upwardly device, in order to when this output voltage switches to this low level by this high level the voltage of this bias voltage is drawn high.
12. circuit of display driving according to claim 1 is characterized in that, this stabilising arrangement comprises a bias voltage transmitting device, is coupled between this calibration apparatus and this accelerator, in order to this bias voltage is transferred to this input end of this calibration apparatus.
13. circuit of display driving according to claim 1 is characterized in that, this display is a carbon nanotube display.
14. a method of adjusting output brightness of display is characterized in that, comprising:
Dispose an output stage, wherein this output stage is coupled at least one pixel of a display, and this output stage is accepted picture element signal control so that the output voltage on this pixel switches between a high pressure and the low pressure;
Dispose a calibration apparatus between this output stage and this pixel;
Apply an input end that is biased in this calibration apparatus and calibrate the display brightness of this pixel with the equivalent resistance of adjusting this calibration apparatus;
Make the voltage level of this input end of this calibration apparatus after through change, can return to this bias voltage; And
Make the voltage level of this input end of this calibration apparatus quicken to return to this bias voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101355132A CN101866628B (en) | 2009-04-17 | 2009-04-17 | Display driving circuit and method for regulating output brightness of display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101355132A CN101866628B (en) | 2009-04-17 | 2009-04-17 | Display driving circuit and method for regulating output brightness of display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101866628A true CN101866628A (en) | 2010-10-20 |
| CN101866628B CN101866628B (en) | 2012-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101355132A Expired - Fee Related CN101866628B (en) | 2009-04-17 | 2009-04-17 | Display driving circuit and method for regulating output brightness of display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799460A (en) * | 2021-01-30 | 2021-05-14 | 珠海巨晟科技股份有限公司 | Comparison circuit with mismatch calibration function |
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|---|---|---|---|---|
| KR20050080319A (en) * | 2004-02-09 | 2005-08-12 | 삼성전자주식회사 | The bias circuit for preventing the distortion of color in crt |
| KR101060450B1 (en) * | 2004-09-30 | 2011-08-29 | 엘지디스플레이 주식회사 | OLED display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799460A (en) * | 2021-01-30 | 2021-05-14 | 珠海巨晟科技股份有限公司 | Comparison circuit with mismatch calibration function |
| CN112799460B (en) * | 2021-01-30 | 2022-03-29 | 珠海巨晟科技股份有限公司 | Comparison circuit with mismatch calibration function |
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| Publication number | Publication date |
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| CN101866628B (en) | 2012-04-04 |
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