CN100440303C - Hybrid driving method and integrated circuit for LCOS - Google Patents
Hybrid driving method and integrated circuit for LCOS Download PDFInfo
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- CN100440303C CN100440303C CNB2005100933781A CN200510093378A CN100440303C CN 100440303 C CN100440303 C CN 100440303C CN B2005100933781 A CNB2005100933781 A CN B2005100933781A CN 200510093378 A CN200510093378 A CN 200510093378A CN 100440303 C CN100440303 C CN 100440303C
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- liquid crystal
- pulsewidth
- brightness value
- mode
- threshold
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Abstract
The invention relates to a method for driving the silicon liquid crystal display via mixed driving powers, wherein it comprises: receiving the brightness signal relative to the pixel; comparing the brightness signal with the first threshold value; if it is not less than the first threshold value, entering into digit driving method; if it is lower than the first threshold value, entering into analogue driving method; the digit driving method fixes voltage and changes the impulse width to drive the silicon liquid crystal display element; the analogue driving method fixes the impulse width and changes the voltage to drive the display element.
Description
Technical field
Relate generally to modulus combination drive integrated circuit of the present invention.More specifically, the present invention relates to be used for modulus hybrid driving method and the corresponding circuit of LCOS (liquid crystal on silicon).
Background technology
The LCOS display technique is just becoming in the display technique of future generation more and more important a kind of.As shown in Figure 1, show the sketch of traditional LCOS display device.LCOS equipment 10 comprises silicon substrate 12, be placed on the bond pad 14 around it and be positioned at the array of display cells 16 in substrate 12 centres.In the bottom of array 16 be distributed with circuit region 18 on every side.Cover glass 20 via fluid sealant 22 and array of display 16 close mutually and, accompany liquid crystal layer therebetween.In general, the size of silicon substrate 12 is less than 20 millimeters.LCOS equipment 10 is worked in the reflection mode.
At present, the drives mode of LCOS pel array mainly contains two kinds: analog-driven mode and digital drive mode.U.S. Pat 6,421,307 and U.S. Pat 6,731,272 in the implementation method of these two kinds of type of drive has been described respectively.Here will be with reference to whole technology contents wherein.
In U.S. Pat 6,421, the electrical schematic diagram of the analog-driven mode of LCOS pel array has been described in 307.As shown in Figure 2, each driver element 24 comprises access transistor T1a and capacitor Cs.The pixel that each unit 24 drives in the array.The grid of transistor T 1a is connected to word line WL, and source electrode is connected to bit line BL, and drain electrode is connected to the end of capacitor Cs, and then is connected to mirror plate 26 (corresponding to the electrode of liquid crystal below among Fig. 1).The other end of capacitor is connected to ground.Above liquid crystal layer, be formed with top electrode 28.In the analog-driven mode, utilize discharging and recharging of capacitor Cs to change voltage between top electrode 28 and the mirror plate 26, thereby change Electric Field Distribution, and then drive liquid crystal material.And the characteristic that Cs discharges and recharges is determined by the voltage on word line WL, the bit line BL.Therefore, input signal (wanting data presented) is shown with analog form.This method circuit structure is simple, the display quality height.But because the restriction of process conditions, the micro-display device of making all can have some defectives inevitably usually.And in the analog-driven mode, inconsistent between each pixel (for example, thickness of liquid crystal is inconsistent, the existence of defective etc.) can seem obviously (being discovered) by human eye, especially more obvious under bright field situation (driving voltage is higher).Therefore, the yields of the micro-display device of analog-driven formula can be lower usually.And, owing to need to use the capacitor of extremely low leakage rate to keep sparking voltage, therefore, very high to manufacture process requirement.
In U.S. Pat 6,731, a kind of realization circuit of digital drive mode has been described, as shown in Figure 3 in 272.This circuit carries out width modulation in PWM (width modulation) mode to input signal under the situation of fixed voltage.The principal feature of PWM is that voltage is fixed, pulse width variations.PWM digital drive mode is owing to be not to be operated in the voltage-sensitive zone, thereby can cover defective greatly effectively.And owing to need not use big electric capacity capacitor to keep sparking voltage, manufacture process requirement does not have analog drive circuit so harsh yet.But PWM digital drive mode also has problems: it the artifacts (artifacts) of some similar contour contour samples can occur when the more approaching image of the GTG that shows some low-light levels (details in a play not acted out on stage, but told through dialogues) and neighbor.This problem all exists for all types of PWM type digital drive displays.And having become influences the bottleneck problem that PWM type digital drive display display quality improves.Problem hereto, those skilled in the art also do not find effective solution always.At present, in order to solve this defective, most of people have taked to improve the method for the bit number of grey level, and this has brought the too high problem of data transfer rate, causes circuit to be difficult to realize.
In sum, in the realization of LCOS display driver circuit, mainly contain two kinds of analog-driven mode and digital drive modes at present.Analog-driven mode display quality when details in a play not acted out on stage, but told through dialogues is higher, and inconsistent and some defective of liquid crystal device can show more significantly when bright field; And display quality is higher during digital drive mode bright field, then can the artifacts of some similar contour contour samples occur when the more approaching image of the GTG that shows neighbor during details in a play not acted out on stage, but told through dialogues.
Summary of the invention
Based on the problems referred to above that current liquid crystal industry faces, the present invention proposes a kind of combination drive scheme that analog-driven mode and digital drive mode are integrated.
According to a first aspect of the invention, proposed a kind ofly to drive the method for silicon-base liquid crystal display device, having comprised: receive and the corresponding brightness value signal of pixel in the combination drive mode; Brightness value signal and first threshold are compared; If the brightness value signal more than or equal to first threshold, is then determined to enter the digital drive mode, if the brightness value signal is less than first threshold, then determine to enter the analog-driven mode, wherein: the digital drive mode changes the mode of pulsewidth by fixed voltage, drives silicon-base liquid crystal display device; The analog-driven mode changes the mode of voltage by fixed pulse width, drives silicon-base liquid crystal display device.
According to a second aspect of the invention, proposed a kind of hybrid drive that is used to drive silicon-base liquid crystal display device, having comprised: the digital drive parts, be used to utilize the brightness value signal, by fixed voltage, change the mode of pulsewidth, drive silicon-base liquid crystal display device; And the analog-driven parts, be used to utilize the brightness value signal, by fixed pulse width, change the mode of voltage, drive silicon-base liquid crystal display device.This hybrid drive also comprises the gating control assembly, the gating control assembly receives and the corresponding brightness value signal of pixel, and the brightness value signal is compared with first threshold, at the brightness value signal during more than or equal to first threshold, brightness value signal input digit driver part; At the brightness value signal during less than first threshold, with brightness value signal input analog-driven parts.
Utilize the present invention, when showing bright field, use the digital drive mode, so just do not have the problem of amplifying defective in the simulation model because of adding high pressure, thereby improved the display quality when bright field shows; And when showing details in a play not acted out on stage, but told through dialogues, use the analog-driven mode, can when the more approaching image of the GTG of demonstration neighbor, the artifacts of the contour contour sample in the similar figure pattern not occur like this.Thereby, utilize the present invention, make LCD all obtain more excellent display quality at bright field and details in a play not acted out on stage, but told through dialogues.
Description of drawings
Fig. 1 is the diagrammatic sketch of the LCOS display device of prior art;
Fig. 2 is the electrical schematic diagram of the analog-driven mode of prior art;
Fig. 3 is the electrical schematic diagram of the digital drive mode of prior art;
Fig. 4 is the schematic block diagram according to the hybrid driving method of the embodiment of the invention;
Fig. 5 is the schematic block diagram according to the method for the realization gating control of the embodiment of the invention;
Fig. 6 is a schematic block diagram of using hybrid driving circuit 100 of the present invention;
Fig. 7 is the schematic block diagram according to the combination drive parts 110 of the embodiment of the invention.
Embodiment
With reference to figure 4, Fig. 4 shows the synoptic diagram that drives pixel according to the present invention in the combination drive mode.In Fig. 4, at first in step 401 from input digital video signals such as optical cable, cable or catv lines.In step 402, the digital video signal of importing is carried out convergent-divergent (scaling) handle, make it to become the digital video signal that is complementary with display device.For example, if display device is 1024 * 1024 the display device with mega pixel level (can obtain from Hitachi, Ltd), then when the vision signal of input is signal corresponding to 768 * 768 pixels, it is carried out processing and amplifying, and, it is compressed processing when the vision signal of input during corresponding to 1280 * 1280 pixels.After the convergent-divergent processing, the digital video signal that is obtained is corresponding one by one with the pixel of display device.Here, suppose pixel (a capable with i, the j row
i, b
j) corresponding signal is B
Ij
In a preferred embodiment, B
IjBe and the corresponding digitized brightness value of gray level.For example, under the situation of 8 bit gradation levels, (at this moment, have 2
8=256 gray levels), B
IjIt is the natural number between 0 and 255.B
IjDifferent values has determined at different pixel point (a
i, b
j) the different brightness located.
Then in step 403, with B
IjValue and preset value B
tCompare.B
tIt is a certain preset brightness threshold value.In theory, B
tIt can be the arbitrary value in the grey level range.But, B in fact
tSetting range be less than B
IjScope.In above example (256 gray levels), B
tValue should between 25～100, be preferably 60.If B
IjValue more than or equal to preset value B
t("Yes" in the step 403) then enters step 404.In step 404, enter the digital drive mode.At this moment, the brightness value signal B of input
IjBeing converted into voltage is constant V
0, pulsewidth is at P
w～T
0Between digital drive signals.And brightness value signal B
IjBig more, pulsewidth is narrow more.But the narrowlyest can not be narrower than P
wWherein, V
0Preferred liquid crystal driving signal voltage when being digital drive, its material, geometric parameter and fresh water (FW) equality with liquid crystal is relevant, can be located between 2.5V～5V usually, is preferably 3V.T
0Be the cycle of frame refreshing frequency, if supposition is the frame frequency of 60Hz, then T
0Equal 16.67ms.P
wThen be the minimum pulsewidth of default digital drive mode.P
wValue can be located between 1.5ms～7ms, is preferably 4ms.In step 406, drive and brightness value signal B then with the digital lcd drive signal 111 after the conversion
IjCorresponding pixel (a
i, b
j).
In addition, if B
IjValue less than preset value B
t("No" in the step 403) then enters step 405.In step 405, enter the analog-driven mode.At this moment, the brightness value signal B of input
IjBeing converted into pulsewidth is constant P
w, voltage is at 0～V
0Between analog drive signal.And brightness value signal B
IjMore little, voltage is more little.But minimum can not be lower than 0V.Wherein, V
0Maximum liquid crystal driving signal voltage when being analog-driven, its material, geometric parameter and fresh water (FW) equality with liquid crystal is relevant, can be located between 2.5V～5V usually, is preferably 3V.P
wThen be the constant pulsewidth of default analog-driven mode.P
wValue can be located between 1.5ms～7ms, is preferably 4ms.In step 406, drive and brightness value signal B then with the simulation liquid crystal driving signal 121 after the conversion
IjCorresponding pixel (a
i, b
j).
In sum, at input brightness value signal B
IjAfter, at first with signal B
IjWith preset value B
tCompare,, select to enter digital drive or analog-driven mode then according to comparative result.Preset value B
tCan preestablish during fabrication, also can in use freely set by the user.Preset value B
tBe actually " transfer point " when selecting type of drive.Preferably, at contiguous B
tScope in (as in above example 55～65), to the input brightness value signal B
IjCarry out " smoothly " and handle,, thereby make when adjoining two values (as 59,61) of input the pixel (a of driving acquisition so that digital drive and analog-driven be complementary
i, b
j) brightness big jump can not appear.
In a preferred embodiment, between step 401 and 402, can also carry out buffer memory to the digital video signal of input.For example, can with next line or down the data of several row or next frame deposit in earlier in the memory buffer, when waiting to flush to corresponding pixel, again corresponding data is read in.
Selection between above digital drive mode and the analog-driven mode can be accomplished in several ways.As shown in Figure 5, in a preferred embodiment, comparative result output as switch controlling signal, is controlled two switch S 1 (51) and S2 (52) respectively.At B
IjMore than or equal to B
tThe time, switch controlling signal makes switch S 1 closure, S2 disconnects, and at B
IjLess than B
tThe time, control signal makes switch S 2 closures, S1 disconnects.In addition, also can realize in another way, promptly when entering the digital drive mode, add check code C=1, when entering the analog-driven mode, add check code C=0 the control of switch S1 and S2, switch S 1 closure when C=1, S2 disconnects.And when C=0 switch S 2 closures, S1 disconnects.In the present invention, described switch S 1, S2 can utilize integrated circuit (IC)-components (for example, to realize MOSFET) that this has been well known to those of ordinary skill in the art.
Fig. 6 shows the schematic block diagram of using hybrid driving circuit 100 of the present invention.Hybrid driving circuit 100 comprise the receiving digital video signal receiving-member 61, to the digital video signal that receives carry out convergent-divergent parts 62 that convergent-divergent handles and with pixel combination drive parts 110 one to one.Receiving-member 61 receives from the digital video signal of inputs such as cable, optical fiber.In a preferred embodiment, receiving-member 61 comprises that also the digital video signal to input carries out the buffer memory parts of buffer memory.The buffer memory parts can the buffer memory next line or the data of several row or next frame down.In addition, the buffer memory parts can be positioned at receiving-member 61 inside, also can be positioned at receiving-member 61 outsides.Convergent-divergent parts 62 are connected to receiving-member 61, are used to carry out convergent-divergent and handle.Signal after the processing is and pixel (a
i, b
j) corresponding digital video signal B
IjEach combination drive parts 110 receive from the digital video signal B of convergent-divergent parts 62 outputs
Ij, and it is handled, output signal drives corresponding pixel (a then
i, b
j).
Fig. 7 shows the schematic block diagram of combination drive parts 110.Combination drive parts 110 comprise the gating control assembly 120 that digital drive parts 130, analog-driven parts 140 and between switch.With pixel (a
i, b
j) corresponding brightness value signal B
IjBe input in the gating control assembly 120, gating control assembly 120 is with B
IjWith predetermined threshold value B
tCompare, if B
IjMore than or equal to B
t, then make B
IjEnter digital drive parts 130.If B
IjLess than B
t, then make B
IjEnter analog-driven parts 140.As mentioned above, in the example of 256 gray levels, B
tValue should between 25～100, be preferably 60.
In digital drive parts 130, the brightness value signal B of input
IjBeing converted into voltage is constant V
0, pulsewidth is at P
w～T
0Between digital drive signals.And brightness value signal B
IjBig more, pulsewidth is narrow more.But the narrowlyest can not be narrower than P
wWherein, V
0Preferred liquid crystal driving signal voltage when being digital drive, its material, geometric parameter and fresh water (FW) equality with liquid crystal is relevant, can be located between 2.5V～5V usually, is preferably 3V.T
0Be the cycle of frame refreshing frequency, if the supposition frame frequency is 60Hz, T then
0Equal 16.67ms.P
wThen be the minimum pulsewidth of default digital drive mode.P
wValue can be located between 1.5ms～7ms, is preferably 4ms.
And in analog-driven parts 140, the brightness value signal B of input
IjBeing converted into pulsewidth is constant P
w, voltage is at 0～V
0Between analog drive signal.And brightness value signal B
IjMore little, voltage is more little.But minimum can not be lower than 0V.Wherein, V
0Maximum liquid crystal driving signal voltage when being analog-driven, its material, geometric parameter and fresh water (FW) equality with liquid crystal is relevant, can be located between 2.5V～5V usually, is preferably 3V.P
wThen be the constant pulsewidth of default analog-driven mode.P
wValue can be located between 1.5ms～7ms, is preferably 4ms.
In the combination drive parts 110 of Fig. 7, gating control assembly 120 preferably can comprise and is used for buffer memory digital video signal B
IjThe buffer memory parts, as ROM, RAM etc.Certainly, the buffer memory parts also can be positioned at gating control assembly 120 outsides.
In the combination drive parts 110 of Fig. 7, gating control assembly 120 is integrated relatively and the function of gating.The gating control assembly 120 of Fig. 7 also can be realized gating control in mode as shown in Figure 5.That is, comparer and two switches are arranged in 120 inside, control the closed and disconnected of two switches respectively according to the output of comparer, thereby control signal enters digital drive parts or analog-driven parts.In a kind of preferred implementation, also can comparer is independent from gating control assembly 120, constitute independent comparing unit.
Above with reference to the accompanying drawings and specify, a plurality of method and apparatus embodiment of the present invention has been described.Combination drive scheme of the present invention simple analog-driven or digital drive in the prior art has obvious advantage.This scheme has overcome puzzlement those skilled in the art technical matters (defect problem in the analog-driven mode, and the contour contour phenomenon in the digital drive mode) for many years.Comparing with existing analog/digital liquid crystal display product with the LCD that combination drive scheme of the present invention drives, is all to show good display performance at bright field or in details in a play not acted out on stage, but told through dialogues.And the related circuit of this programme is simple, and wherein the digital drive part can be utilized existing technology easily with the analog-driven part, makes it be easy to realize and in industrial application.
Although described the present invention above with reference to specific embodiment, it should be appreciated by those skilled in the art, under the situation of the spirit and scope of the present invention that do not break away from the claim qualification, can merge, break, replace, revise its each ingredient.
Claims (28)
1. one kind drives the method for silicon-base liquid crystal display device in the combination drive mode, comprising:
Receive and the corresponding brightness value signal of pixel;
Described brightness value signal and first threshold are compared;
If described brightness value signal more than or equal to first threshold, is then determined to enter the digital drive mode, if described brightness value signal less than first threshold, then determines to enter the analog-driven mode, wherein:
Described digital drive mode changes the mode of pulsewidth by fixed voltage, drives silicon-base liquid crystal display device;
Described analog-driven mode changes the mode of voltage by fixed pulse width, drives silicon-base liquid crystal display device.
2. the method for claim 1, the step of wherein more described brightness value signal and first threshold also comprises: read first threshold and be used to compare from storer.
3. the method for claim 1, wherein said brightness value signal is the brightness value signal under the 8 bit gradation levels.
4. method as claimed in claim 3, wherein said first threshold is between 25～100.
5. method as claimed in claim 4, wherein said first threshold is 60.
6. the method for claim 1, the liquid crystal driving signal voltage of wherein said digital drive mode is between 2.5～5V.
7. method as claimed in claim 6, the liquid crystal driving signal voltage of wherein said digital drive mode is 3V.
8. the method for claim 1, the liquid crystal driving signal pulsewidth of wherein said digital drive mode be greater than the pulsewidth of setting, and less than cycle of frame refreshing frequency.
9. method as claimed in claim 8, the pulsewidth of wherein said setting is between 1.5ms～7ms.
10. method as claimed in claim 9, the pulsewidth of wherein said setting are 4ms.
11. the method for claim 1, the pulsewidth of the liquid crystal driving signal pulsewidth of wherein said analog-driven mode for setting.
12. method as claimed in claim 11, the pulsewidth of wherein said setting is between 1.5ms～7ms.
13. method as claimed in claim 12, the pulsewidth of wherein said setting are 4ms.
14. the method for claim 1, the liquid crystal driving signal voltage of wherein said analog-driven mode is less than the liquid crystal driving signal voltage of described digital drive mode.
15. a hybrid drive that is used to drive silicon-base liquid crystal display device comprises:
The digital drive parts are used to utilize the brightness value signal, by fixed voltage, change the mode of pulsewidth, drive silicon-base liquid crystal display device; And
The analog-driven parts are used to utilize the brightness value signal, by fixed pulse width, change the mode of voltage, drive silicon-base liquid crystal display device;
Described hybrid drive also comprises the gating control assembly, the gating control assembly receives and the corresponding brightness value signal of pixel, and described brightness value signal is compared with first threshold, during more than or equal to first threshold, described brightness value signal is imported described digital drive parts at described brightness value signal; During less than first threshold, described brightness value signal is imported described analog-driven parts at described brightness value signal.
16. device as claimed in claim 15 also comprises the memory unit of storing described first threshold.
17. device as claimed in claim 15, wherein said brightness value signal are the brightness value signals under the 8 bit gradation levels.
18. device as claimed in claim 17, wherein said first threshold is between 25～100.
19. device as claimed in claim 18, wherein said first threshold is 60.
20. device as claimed in claim 15, the liquid crystal driving signal voltage of wherein said digital drive parts is between 2.5～5V.
21. device as claimed in claim 20, the liquid crystal driving signal voltage of wherein said digital drive parts is 3V.
22. device as claimed in claim 15, the liquid crystal driving signal pulsewidth of wherein said digital drive parts be greater than the pulsewidth of setting, and less than cycle of frame refreshing frequency.
23. device as claimed in claim 22, the pulsewidth of wherein said setting is between 1.5ms～7ms.
24. device as claimed in claim 23, the pulsewidth of wherein said setting are 4ms.
25. device as claimed in claim 15, the pulsewidth of the liquid crystal driving signal pulsewidth of wherein said analog-driven parts for setting.
26. device as claimed in claim 25, the pulsewidth of wherein said setting is between 1.5ms～7ms.
27. device as claimed in claim 26, the pulsewidth of wherein said setting are 4ms.
28. device as claimed in claim 15, the liquid crystal driving signal voltage of wherein said analog-driven parts is less than the liquid crystal driving signal voltage of described digital drive parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100933781A CN100440303C (en) | 2005-08-23 | 2005-08-23 | Hybrid driving method and integrated circuit for LCOS |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100933781A CN100440303C (en) | 2005-08-23 | 2005-08-23 | Hybrid driving method and integrated circuit for LCOS |
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| CN1920927A CN1920927A (en) | 2007-02-28 |
| CN100440303C true CN100440303C (en) | 2008-12-03 |
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| CNB2005100933781A Expired - Fee Related CN100440303C (en) | 2005-08-23 | 2005-08-23 | Hybrid driving method and integrated circuit for LCOS |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106205481B (en) * | 2016-07-06 | 2019-01-11 | 昀光微电子（上海）有限公司 | A kind of microdisplay on silicon |
| CN106910449B (en) * | 2017-03-09 | 2020-07-31 | 南京迈智芯微光电科技有限公司 | Silicon-based display based on fusion scanning strategy |
| CN106652963B (en) * | 2017-03-09 | 2020-01-17 | 南京迈智芯微光电科技有限公司 | Silicon-based display driven by digital-analog integration |
| CN110570810B (en) * | 2019-09-11 | 2021-05-04 | 成都辰显光电有限公司 | Driving device and driving method of display panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6215466B1 (en) * | 1991-10-08 | 2001-04-10 | Semiconductor Energy Laboratory Co., Ltd. | Method of driving an electro-optical device |
| US6567063B1 (en) * | 1998-04-10 | 2003-05-20 | Hunet, Inc. | High-speed driving method of a liquid crystal |
| CN1622184A (en) * | 2003-11-29 | 2005-06-01 | 三星Sdi株式会社 | Driving method of fs-lcd |
-
2005
- 2005-08-23 CN CNB2005100933781A patent/CN100440303C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6215466B1 (en) * | 1991-10-08 | 2001-04-10 | Semiconductor Energy Laboratory Co., Ltd. | Method of driving an electro-optical device |
| US6567063B1 (en) * | 1998-04-10 | 2003-05-20 | Hunet, Inc. | High-speed driving method of a liquid crystal |
| CN1622184A (en) * | 2003-11-29 | 2005-06-01 | 三星Sdi株式会社 | Driving method of fs-lcd |
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