CN1692397A - A field sequential display device and methods of fabricating same - Google Patents
A field sequential display device and methods of fabricating same Download PDFInfo
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- CN1692397A CN1692397A CN 03819289 CN03819289A CN1692397A CN 1692397 A CN1692397 A CN 1692397A CN 03819289 CN03819289 CN 03819289 CN 03819289 A CN03819289 A CN 03819289A CN 1692397 A CN1692397 A CN 1692397A
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Abstract
A device adapted for use in a field sequential color display. The device may include first and second polarizers. A light scattering material may be disposed between the first and second polarizers. Additionally, the display may include a light source having a plurality of colors. Portions of the light scattering material are operable for selectable excitation. An excitation of a portion of the light scattering material is operable for controlling an amount of light of a color of the plurality of colors emitted by the display device. Further, sub-frames from which an image frame is composed may be addressed in a segmented fashion, whereby each sub-frame includes a plurality of segments. The light source is correspondingly pulsed in a segmented fashion. A given segment may be illuminated in a different color in each sub-frame. In this way, perceived flicker may be reduced.
Description
The cross reference of related application
The application enjoys the interim patent No.60/388 of the U.S., 237 (applications on June 13rd, 2002); The right of priority of 60/443,053 (application on February 10th, 2003); Merge therewith by reference.
Technical field
The present invention relates to the flat-panel screens field, relate in particular to a kind of flat-panel screens, this flat-panel screens is included in the light-scattering material between light source and the display surface, shows with the colour of realizing a sequence.
Background technology
In order to reduce the needed space of display device, research and develop various flat panel display devices, for example, LCD (LCD), plasma display panel (PDP) (PDP) and electroluminescent display (EL), replacing bigger cathode-ray tube display spare (CRT), as the display device of normal use.Particularly, under the situation of LCD device, after deliberation liquid crystal technology because can control the optical property of liquid crystal material according to the electric field change that is applied.Skilled artisan was understood in this area, Thin Film Transistor-LCD (TFT-LCD) generally all used thin film transistor (TFT) to come Visual Display Data as switching device and liquid crystal molecule electrooptical effect.
Fig. 1 has illustrated the unit among the TFT-LCD or the diagrammatic cross-section of pixel 100.Unit 100 can comprise: two-layer by polaroid 101 and 102 substrates that skin, glass constituted 103 and 104 that constituted, tin indium oxide (ITO) coating 105 and 106, flour milling condensate alignment 107 and 108, electrooptical liquid crystal twisted-nematic (TN) material 109, active component TFT transistor 110, metal selects and data electrode 111 and 112, color filter 113, light guide 114 and backlight 115.The gap of unit is the space between 107 and 108.This gap has element 111,112 and 110, is restricting the gap size of electrooptical material 109.
Structure shown in Figure 1 also exists some problems.At first, active device 110 needs expensive semiconductor processes.Secondly, active device 110 can reside in the inside of substrate 107 and 108, and this has just limited the gap of unit.The 3rd, drive electrode 111 and 112 can be patterned on the ITO coating 106, and this coating is coated on the substrate 104.In order to keep gap profile little, electrode 111 and 112 and the thickness of transistor 110 will approach.In addition, in order to reduce resistance, will increase the width of electrode 111 and 112.Thin and wide electrode 111 and 112 and the result of thin film transistor (TFT) 110 wide cut that can reduce unit 100 than and the size of restriction display.In addition, make the step that needs many careful controls.For example, the electrooptical effect of liquid crystal molecule needs carefully to quasi-molecule, therefore just needs expensive preparation flour milling condensate alignment 107 and 108.
In addition, field sequential color (FSC) system can adopt direct-view and the projection mode based on specular scattering type LCDS, yet, the chances are owing to feel the shortage of optical contrast ratio of this system, also do not develop the scattering liquid crystal system that is applicable to transmission FSC, for example, condensate scattering liquid crystal (PDLC).It is reported that the major advantage of PDLC is no longer to need polaroid; So the application of PDLC in display concentrates on specular scattering pattern formula-direct-view and projection, and do not need to use polarization film.
The research based on LCD that is applied to FSC of transmission comprises ferroelectric (U.S. Patent No. 2001/0035852), light-operated birefringence (OCB) or pi-unit (are invented by people such as Yukio, U.S. Patent No. 4,582,396 and U.S. Patent No. 2002/0140888, U.S. Patent No. 2002/0145579 and U.S. Patent No. 2002/0149551; With U.S. Patent No. 2002/0149576), and the improvement Driving technique be applied to the TN display (for example, Japanese Hunet andBright company limited report, U.S. Patent No. 6,424,329 and U.S. Patent No. 2001/0052885).These researchs all have advantage separately, also exist some problems, for example, and with respect to the output of existing color LCD or the problem of cost-performance.
Therefore, this area just needs flat-panel screens can comprise still less element, and this just can reduce the processing step, thereby reduces the cost of display.
Summary of the invention
The present invention is directed to the problems referred to above, provide a routine display device to have the embodiment of first and second polaroids.Between first and second polaroids, place light-scattering material.In addition, display also comprises the light source with multiple color.The part light-scattering material can carry out selective excitation.The exciting of part light-scattering material can be used to control the quantity of the color of light of the multiple color of being sent by display device.
Essential characteristic and the technological merit of one or more embodiment of the present invention have below been set forth, so that the present invention may be better understood following detailed description.Other features and advantages of the present invention will be done further to discuss in the claim of claim of the present invention.
Brief description of the drawings
When considering following detailed description, just can obtain the present invention is better understood in conjunction with following accompanying drawing;
Fig. 1 is the diagrammatic cross-section of explanation TFT LCD display part;
Fig. 2 has illustrated the light scattering display unit according to the embodiment of the invention;
Fig. 3 has illustrated the structure that is similar to unit shown in Figure 2 and has comprised the unit of the driving circuit relevant with it;
Fig. 4 has illustrated the unit embodiment that uses reflective display;
Fig. 5 is the decomposing schematic representation of explanation according to the display device of the embodiment of the invention;
Fig. 6 is that explanation can be in conjunction with the synoptic diagram of the employed driving circuit of display embodiment shown in Figure 5;
Fig. 7 illustrates the decomposing schematic representation of display device according to another embodiment of the present invention;
Fig. 8 is that explanation can be in conjunction with the synoptic diagram of employed device work embodiment illustrated in fig. 7;
Fig. 9 A to 9C is the process flow diagram of explanation according to the field sequential color method of the embodiment of the invention;
Figure 10 is that explanation is applicable to the process flow diagram according to the manufacture method of the liquid crystal display device of the embodiment of the invention, and in the method, metal oxide varistor can be used as active device and uses;
Figure 11 is that explanation is applicable to the process flow diagram according to the manufacturing process of the liquid crystal display device of the embodiment of the invention, and in this technology, transistor can be used as active device and uses;
Figure 12 is that the process flow diagram of transistor as another manufacture method of the LCD of active component used in explanation; With,
Figure 13 is the process flow diagram that the manufacture method of the liquid crystal display device that is applicable to another embodiment of the present invention is described.
Specific implementation method
In the following description, many concrete details have further been set forth, so that complete understanding of the present invention is provided.Yet, concerning the skilled artisan of this area, do not have these details to realize that the present invention also is conspicuous.In other words, the mode with block scheme shows that well-known circuit is not just in order to obscure the present invention in some dispensable details.With regard to most of, omitted details that some relevant sequential are considered, because these details are not essential for complete understanding the present invention, and all within the technical scope of the skilled artisan in correlative technology field.
Introduce
The method that a kind of sequence flat panel display device is provided and has made this class device.The color of field sequential color (FSC) display device shows can not use color filter, and is to use and the combined high-speed switch liquid crystal material (perhaps other optical material) of high-speed switch light source that comprises different colours.The FSC display device is not to use the subpixel of color space modulation, and is to use the time-domain multiplexed of the color of light in single pixel to come Show Color.
Have the scattering LCD that adopts the type that local volume forms that additional polymerization body or other technology create, making up with the cross polarization sheet provides straight watching display spare.At U.S. Patent Application Serial Number No.60/388,237, be entitled as " solid state display " (application on June 13rd, 2002), with U.S. Patent Application Serial Number No.60/443,053, be entitled as in " solid state display " (application on January 28th, 2003) this class device has been discussed, with reference to merging therewith by two literary compositions.
The display of use according to the present invention scattering media such as scattering LCD comprises scattering liquid crystal system (LCDS) on principle, it is relevant with the display device embodiment that an example is created shown image based on the transmittance of light scattering media modulation display.In addition, other embodiments of the invention can be used the scattering media, rather than the light scattering unit of LCDS class.Below various light-scattering materials will be discussed further.Skilled artisan in this area is appreciated that principle of the present invention can be by such as the sensation of the persistence of vision of human eye and adopt any scattering media with the needed optics of display device and switching characteristic to realize.
With regard to this paper, defined LCDS can comprise all can create the light scattering liquid crystal system on a plurality of surfaces in a unit, for example comprise, but be not restricted to, condensate scattering liquid crystal (PDLC), oppositely PDLC (for example, in U.S. Patent No. 5,056,898 and 5,270, discussed in 843, and internal reflection backscattering (IRIS) pattern of Seiko-Epson company), holographic PDLC (H-PDLC), to row calibration curve phase (NCAP), polymer network liquid crystal (PNLC), condensate capsule liquid crystal (PELC), condensate is stablized cholesteryl liquid crystal structure (PSCT), builtup film (PSCOF) is separated, such as in U.S. Patent No. 2001/0035918 the colloid module liquid crystal composition the complex of discussing, this patent merges therewith by reference, PMMA resin LC complex, and LC and big molecule L C molecule synthesis thing.
LCDS also can comprise the LC potpourri, the nano particle that it has comprised scattering (for example, silica dioxide granule, by Nanotechnology Inc., Austin, TX produce or by Altair Nanotechnology, Reno, NV produces), these particles can produce and make light by the necessary effect of LC molecule institute scattering.This particle self is all very little and transparent.
LCDS can comprise that also by the raceway groove in the unit, bag or LCDS that the hole forms, it also can have the same effect of the polymer dispersed that is similar to scattered light.The example of this class technology can comprise Viztec, Inc., Cleveland, the Plastic Pixels that OH produced and handled
TMSiPix Imaging, Milpitas, the Microcup LCD that CA produced and handled (discuss among U.S. Patent No. 2002/0126249 A1, merge therewith by reference) at this, and PoLiCryst was (as what L.Vicari discussed, see J.Opt.Soc.Am.B, Vol.16, pp.1135-1137 (1999)), merge therewith by reference at this.Other technology comprises that employing comes the perforate in the filled plastics sheet or connects micropore (as in U.S. Patent No. 4,048, discussed in 358, at this by with reference to merging therewith) to row or other liquid crystal.Can produce this class aperture now, for example, by 3M, Minneapolis, MN and AveryDennison, Pasadena, little reproduction technology that this class company of CA is adopted, perhaps, for example, adopt strange shape film platform in the monster of being developed by Papayron B.V. (Holland).
Skilled artisan in this area all can be identified as LCDS with various these type systematics.
As explained above, embodiments of the invention not only are limited to the light scattering unit of LCDS type, but also can comprise other light scattering liquid crystal material such as chiral nematic liquid crystal or twisted liquid crystal, it can present light scattering mode and present pellucidity in flat state in the state of focus circular cone [secondary] curve.Equally, well-known, the liquid crystal of smectic A also can a kind of state scattered light and is changed pellucidity with another kind of state.Distortion and smectic A liquid crystal do not need polymer network or are dispersed in to create scattering effect in the polymer matrix, but can adopt polymer network to create yet.
In addition, the present invention also can be applied to non-liquid crystal material, and it can be from the light-scattering state optical change to basic optical transparency state.For example, little particulate matter is suspended in the media, and can have the behavior (scattering or not scattering) of aforesaid way.The example that one class can be suspended in the particulate matter in the media is by ReserchFrontiers Inc.Woodbury, the suspended particle device that NY developed (SPD) photocontrol technology.This is a kind of in several non-liquid crystal electroopticals (switching) light-scattering material, and it can use in conjunction with the principle of the invention.
Equally, it should be noted that and to improve the optical transmission performance by the late effect that reduces in the unit.This delay be by the droplet in the unit suitably preferred alignment produce.This can be by such as the selection of cell gap with make that the combination of various technology realizes the treatment process parameter.
Fig. 2-light scattering display unit
Fig. 2 has illustrated the embodiment of the invention of a routine unit or pixel 200.(as following will further discuss), made display can comprise a plurality of unit 200.Unit 200 can comprise three layers, and upper polarizer 201, light-scattering material 202 are arranged, for example, and scattering liquid crystal system discussed above (LCDS) or other electrical-optical scattering material.For example, light-scattering material can be PDLC.In addition, unit 200 comprises polaroid 203 down.Upper polarizer 201 can adopt the conductive material 204 of substantially transparent to apply, for example, and tin indium oxide (ITO).Following polaroid 203 can adopt the conductive material 205 of substantially transparent to apply.In one embodiment, plastics or condensate can keep polaroid 201 and 203, to eliminate employed glass or other substrate in conventional display.
With regard to light-scattering material 202, in embodiments of the present invention, light-scattering material 202 can constitute nematic liquid crystal is captured in the very little droplet, is referred to as " bubble ".In case during light-scattering material 202 hardening, just collect bubble.In addition, light-scattering material 202 can constitute hardening, so that form the relative key of gas between polaroid 201 and 203.Operable PDLC complex comprises the Ltd. by Chemical, Poole, the commodity liquid crystal BL035 that UKde Merck Specialty is produced is dispersed in FFLFunktionsfluid GmbH, Mainz-Hechtsheim, the ultraviolet that Germany produced (UV) cured epoxy MXM35.For example, can be used as in epoxy and the employed complex of liquid crystal in this class can be about 30% epoxy and the ratio of 70% liquid crystal.
In addition, light-scattering material 202 can constitute hardening, to be formed on the bonding between polaroid 201 and 203.In addition, by in unit 200, inserting light-scattering material 202, just no longer need be in existing LCD display needed liquid filling treatment step.Equally, substitute the LCD material, can eliminate sealing around the critical vacuum at edge by adopting light-scattering material 202.
Fig. 2 has also illustrated light source, and LED 209, with the use of explanation unit 200 in display structure.LED 209 can be substituted in employed fluorescent tube in the conventional LCD display, and can eliminate the needs of expensive color filter.In addition, because LED can switch in conjunction with the switching of electric light scattering material 202, so a sequential color display can use in accordance with the principles of the present invention unit 200 to make.In addition, 2/3rds the data driver that is used for presenting the required number of drives of all three looks (red, green and blue) in conventional LCD display has been eliminated in such work.In addition, because unit 200 no longer is divided into the subpixel of the red, green and blue in conventional LCD display, so so just increased aperture ratio.In addition, light source can be adjusted, thereby can calibrate before the light transmission unit.This has just reduced owing to be the light leakage that enters the wide visual angle that birefringence effect was produced of light with an angle in the liquid crystal material of light in scattering material.
In a routine embodiment, light-scattering material can constitute LCDS.It should be noted that, light-scattering material can be any material that can switch to second state in first state from first state, light-scattering material is unscattered in the operation part of spectrum that display uses at least, and in second state, light-scattering material is unscattered in part spectrum.Be in the spectrum operation part be visible light in typical case, the principle of the invention can be applied to the application that at least one light source is the part spectrum of invisible light.For example, night vision is used and can be used infrared light supply.In addition, light-scattering material is that the variation of function can be continuous basically with the cell voltage between first and second states (perhaps opposite), thereby amount of light scatter also is a continually varying.Hereinafter will further discuss.
By obtaining contrast by ratio between display device maximum transmitted-also can be referred to as brightness (photoconduction leads to ON) state and dark (light is by OFF) state.When light-scattering material is substantially transparent, just can not influence then from polarized light backlight and that first polarization layer is entered, basically stopping and can obtain light by preceding polaroid by OFF or state secretly.When light-scattering material is in its maximum scattering brightness (photoconduction leads to ON) state, the only scattering that then enters, this light that just can depolarize effectively makes light and can obtain light ON or luminance state through preceding polaroid.
As discussed above, display can merge a plurality of unit 200.Such display can comprise the drive circuit that combines with each unit, so that the light transmission of modulating scattering of light and then modulating unit by modulation electric light scattering media.Fig. 3 has illustrated unit 300, is similar to the structure of unit shown in Figure 2 200, and comprises the driving circuit that combines with it.Polaroid 301 and 303, conductive material 304 and 305, light-scattering material 302 and light source 309 all are similar to the sheet 201 and 203 that shakes, conductive material 204 and 205, light-scattering material 202 and light source 209 shown in Figure 2 respectively.Drive electrode comprises row selection 306, and data line (or, be equivalent to column selection) 307.To further discuss as following, electrode 306 and 307 and active component 308 be coupled.Active component can comprise amorphous silicon (a-Si) thin film transistor (TFT) (TFT), multi-crystal TFT, TFT, CdSe TFT or other switching device, for example, metal-insulator-metal (MIM) diode, perhaps metal oxide varistor (MOV) is as discussed below.Electrode 306 and 307 can Direct Bonding on polaroid 303, because plastics or condensate can keep polaroid 303.Therefore, just can eliminate the needs of printed circuit board (PCB) (PCB), printed leads plate (PWB) or banded automated bonding (TAB).In addition because electrode 306 and 307 and active device 308 all be the outside that is in cell gap, circuit 306 and 307 is can the constituent ratio prior art thick, thereby makes required resistance can have very long thick path rather than thin path.Just as shown in Figure 3, active component 308 is within the framework, makes to have bigger surf zone when reducing the wide cut ratio of unit 300, and allows the pixel display density of higher precision.Just as shown in Figure 3, unit 300 is not arranged on any parts in the critical cell gap (space between upper and lower electrode) as conventional display.In cell gap without any parts, unit 300 just can be used for display material, for example, supertwist is to row (STN), twisted-nematic (TN), cholesteryl liquid crystal, organic LED, electroluminescence (EL), electrophoretic ink (E-ink) and electrolytic paper (E-paper).Discuss that another example has than unit 200 more elements but the embodiment of the cellular construction that the ready-made parts of easier employing are made below with reference to Fig. 4.
The embodiment of Fig. 4-another routine unit, it can allow to use the reflective display of ready-made parts
Structure
Fig. 4 has illustrated the embodiment of another example in conjunction with the unit 400 of the principle of the invention, and it allows the structure of the reflective display of the ready-made parts of use.Unit 400 basic structures are same as unit 300 (shown in Figure 3), substitute except the polaroid 301 and 303 (Fig. 3) of unit 300 has adopted condensate or glass substrate 401 and 402.Substrate 401 and 402 can adopt conductive material to cover (being respectively 407 and 408) separately.In a routine embodiment, substrate 402 can be opaque.Conductive material 404 can be transparent, for example, ITO, and coating 407 can be solid conduction coating or dyestuff.Substrate 402 has the size that can be used for maintaining source block 406.Can increase color component 403.
Fig. 5-decomposition view
In order further to understand structure, in the mode of exploded view display device 500-536 is described respectively with reference now to Fig. 5 according to the display device of the embodiment of the invention.
Fig. 5 has illustrated embodiment according to display device 500 of the present invention in the mode of exploded view.Display device 500 is specially adapted to metal oxide varistor 530 (MOV) and uses as active device and passive device 532 resistors.Display device 500 comprises upper and lower polaroid 502 and 504 respectively.Led light source 506 comprises that at least one is arranged on the three colour cell LED (primary colours, red, green and blue) of polaroid 504 fronts.In addition, in light source 506, can also comprise White LED.(skilled artisan in the industry is appreciated that the explanation of light source 506 is a synoptic diagram, and embodiment backlight can comprise and is applicable to versicolor diversity LED device.Hereinafter will further discuss can be in conjunction with the employed operation backlight of the principle of the invention.) in the industry skilled artisan is appreciated that if the polarized light source that uses just can omit down polaroid.For example, can use laser diode that polarized light source is provided.In addition, polarization mechanism can integrate with LED.A kind of such device is by Moxtek, Inc., Orem, the ProFluxMicrowire that UT provided
TMPolaroid.It should be noted that equally, also polaroid not necessarily will be arranged on the outside of substrate.In addition, polaroid can be arranged on the inside surface of substrate, for example, uses thin crystal film (TCF
TM) the polaroid technology, this technology is by Optiva Inc., South San Francisco, and CA provides.This set can reduce parallax.
Be arranged between the upper and lower polaroid is to go up substrate 508, photoelectricity scattering media 510 and subtegulum 512., in embodiments of the present invention, last substrate 508 can be a glass.Conduction data line 514 can be arranged on the lower surface of substrate 508.Data line 514 can be made by ITO, and for example, and groove wherein can adopt laser corrosion and other erosion carving or method of printing to form.Subtegulum 512 provides the supporting construction of the electronic unit of display device.These can comprise respectively the row and column driver 518 and 516 that is coupled with selection wire 522 and data line 520, and are installed on the lower surface of subtegulum 512.Data line 520 is the correspondence data line 514 that is being coupled one by one.The upper surface 524 of subtegulum 51 is attaching conductive coating 526, and this coating is cut apart by groove 528.Groove 528 is being cut apart coating 526, with the formation device cell, and constitutes its bottom electrode.Data line 514 has formed the top electrode of corresponding display unit.Display device 500 has also comprised the driver of each unit, and this can comprise active driver part 530 and passive drive parts 532.Active driver part 530 and passive drive parts 532 can be arranged in the corresponding aperture 536 in the substrate 512.Active drive unit 530 can be the MOV device, and passive drive device parts are resistors.Active driver part 530 can be coupled with selection wire 522 one to one, and passive component can be coupled with data line 520 one to one.
The interconnection of active parts 530 and passive component 532 has formed driver, and this can further understand with reference to figure 6, and Fig. 6 has illustrated that driver 600 includes the schematic construction of source block 530 and passive component 532.Capacitor 602 has been represented the discrete electric capacity of unit.Node 604 is corresponding to the electrical interconnection between data line 520 and data line 514, as what hereinafter discussed.Line 606 has been represented by the electrical connection between conductive coating 526 formed passive components 532 and the active parts 530.
In operation, active parts provides the threshold value that is applicable to electric light scattering media.For can the matrix addressing device, device have kept for half applies voltage V at least
ONIdle state.For example, if device has all reached the voltage V that applies basically
ON, then require at 0.5V
ONV all ends.In other words, the data voltage on data 522 is 0.5V
ONV is V except the voltage on the unit then
ONV, other unit on column direction can conducting.Want these unit of conducting, select or row voltage (corresponding to selecting 520) must reach negative numerical value or-0.5V
ONV.When data voltage is that ground connection and row voltage are-0.5V
ONV, then the unit just should not conducting.
Skilled artisan is appreciated that the thickness that can be arranged on distance between the input and output electrode by variation in the industry, makes MOV conducting under any required voltage.Of the present invention one routine embodiment, MOV can be chosen under the required threshold value and work.For example, the forward voltage (being referred to as the MOV voltage breakdown usually) that can select MOV to have is approximately 5V.As shown in Figure 5, shown active component can be arranged between selected electrode in unit and the bottom electrode.In addition, active parts can be arranged between the top and data electrode of unit.
The MOV active parts also can be used as and does not allow the switch of cell discharge use.This just allows the unit to carry out the operation that is similar to active-matrix device.So display device is no longer dependent on average voltage and carries out work.This just makes the performance of display can be similar to the performance of Active Matrix Display.
Fig. 7 is another example of explanation decomposing schematic representation of display device 700 embodiment in accordance with the principles of the present invention.This display device is similar to device shown in Figure 5 500, and comprises upper polarizer 702.Light-electric light scattering media 710 and following polaroid 712.The top electrode 714 of conduction can be arranged on the lower surface of polaroid 702.Also the mode with embodiment provides down polaroid 712, and as the supporting construction of the electronic unit that is supporting display device, it can comprise respectively the row and column driver 716 and 718 that is coupled with selection wire 720 and data line 722.In addition, following polaroid 712 can form the optical channel that led light source provides light.In another embodiment, subtegulum is similar to subtegulum shown in Figure 5 504, and the following polaroid that can association class be similar to subtegulum shown in Figure 5 512 uses, and perhaps can also be used in combination with the light source of polarization.
Led light source 706 can comprise the LED of at least one three colour cell (primary colours, red, green and blue).In addition, led light source 706 also can have the LED (not shown) of white.The class of operation of display device 700 is similar to the operation of display device 500.Being installed in the another kind of method that active component 800 on the polaroid 712 can be used as active component shown in Figure 5 530 and passive element 532 uses.The hole 736 that 800 of active components use one by polaroid 712.
With reference to figure 8, active component 800 can be TFT or be similar to the device that comprises drain electrode 801, source electrode 802 and grid 803.Pairing structure such as Fig. 7 illustrate.
The wiping of Fig. 9 A-9C-field sequential color is done
Can further understand operation with reference to 9A to 9C according to sequential color display of the present invention.The step 902 of the processing 900 that shows in the field sequence that is used for producing according to the embodiment of the invention, the generation of beginning picture frame.Subsequently, processing 900 just enters into the loop of subframe in step 904.For the purpose of this paper, subframe is appreciated that the arbitrary portion in the complete graph picture frame that becomes to reside on the display; Complete graph picture frame is made up of subframe.Usually, a sequential color is foreseeable, comes the order of the monochromatic subframe of three looks of addressing in all pixels of display to show to constitute in the mode of each subframe.Yet for the purpose of this paper, subframe is not restricted to monochromatic illumination, also quantitatively subframe only is not limited to three.
In step 906, show subframe.Step 906 can further be discussed (wherein, for the ease of another embodiment, label is 906a and 906b respectively) in conjunction with Fig. 9 A and 9B.If current subframe is not the last subframe in the picture frame, then handles 900 and just be back to step 904, to continue the loop of subframe.Otherwise, just in step 902, begin new frame.
Now, with reference to figure 9B, the field sequential color method according to the embodiment of the invention is described in further detail.In step 926, addressing subframe, thereby the numerical value that storage is thrown light in the pixel (perhaps Deng Xiao unit) of subframe.
In step 928, can adopt delay.For example, can use time delay, allow light-scattering material can both reach stable status substantially.Again the light-scattering material with electric light switches to the state of basic optical transparency from light-scattering state, and continues light-scattering state wherein.
In step 930, flasher.Can be determined that comprise, but be not restricted to, the blink speed of subframe, addressing speed, show media enter the response of basicly stable state the lasting period of flicker by Several Factors, and other artificial relevant factor.The masterful technique personage can both know these factors in the industry.And typical numerical value can be in about scope of 1 to about 20ms.
Subsequently, step 908 continues step 906, sees Fig. 9 A.
Another is according to the embodiment of of the present invention sequential color display packing, and the field sequential color (SFSC) that this method can be referred to as to cut apart describes in Fig. 9 C (step 906b).It should be noted that step 906a is appreciated that into the substep of step 906b, in this step, subframe is a single split, or another kind of the elaboration, and SFSC has single split.
In step 956, enter into the loop of segmentation.
In step 958, the pixel corresponding to segmentation is carried out addressing.Such just as will be discussed, this segmentation can comprise the child group pixel of selecting in advance, makes whole demonstration constitute the association of segmentation.In other words, the addressing in step 956 can addressing subframe part.
In step 960, adopted time-delay.Such just as noted above, use time delay, allow light-scattering material can both reach stable status substantially.Again the light-scattering material with electric light switches to the state of basic optical transparency from light-scattering state, and continues light-scattering state wherein.
In step 962, flasher.Can be determined that comprise, but be not restricted to, the blink speed of subframe, addressing speed, show media enter the response of basicly stable state the lasting period of flicker by Several Factors, and other artificial relevant factor.The masterful technique personage can both know these factors in the industry.And typical numerical value can be in about scope of 1 to about 20ms.
According to principle of the present invention, light source can be designed to the light source of segmentation, and the branch segment addressing that it can be combined in the step 956 and be discussed is used.For example, in typical three looks (RGB) sequence showed, when the color graphics of appointment was written to whole subframe, three kinds of light source colors all switched to " OFF ".Because typical the demonstration carries out with 60Hz or 16.66ms, this just makes each subframe be approximately 5.5ms.This work that just means display driver must be than normal fast 3 times.Yet this just opens light source without any the time.Therefore, this just need can write whole demonstration in 1ms, stay 4.6ms and open light source.This just makes display driving circuit bear heavier burden, needs fast 16 times.By adopting the segmentation light source,, each colored light source just can keep " ON " for more time, is approximately 5.5ms, and only just switches to " OFF " in driver is written to time cycle of segmentation subframe pixel.If the segmentation subframe has constituted the row of 20 in the VGA display (640 * 480), for example, with the frame frequency of 60Hz, then this will be to keep 4.80ms among 16.66ms/480/20 or the 694.44ms to be used for the light source conducting.As discussed above, two advantages of this discussion are conspicuous.The first, driver can slower speed write.The second, the time of illustrated segmented image is than long and since to addressing time of segmentation subframe less than the required addressing time of all subframes of addressing.This time difference can make light source remain on the additional period of segmentation subframe flicker.
In order further to understand SFSC, be invoked at the step 956-964 (step 904 is seen Fig. 9 A) in the subframe loop again.So, in each subframe, can each segmentation of addressing, and therefore can addressing all pixels (or being equivalent to the unit) in each subframe.Yet for each segmentation in successive frame, the color of flasher is not necessarily identical in step 912.In other words, in first frame, for given segmentation, the light source colour that is glimmered in step 962 can be first kind of color, for example, what is called is red.In next frame, the light source colour that is glimmered in step 962 can be second kind of color, and for example, what is called is green.Equally, in next frame, the light source colour that is glimmered in step 926 can be the third color, and for example, what is called is blue, and if display comprise that then the rest may be inferred more than three kinds of colors.In addition, in present frame, each segmentation in the segmentation loop can be passed through the included color of light source in proper order.
For the SFSC that can further understand the principle of the invention handles, can consider to further specify some examples of the above-mentioned discussion of segmentation light source.As explained above, can be divided into the segmentation of forming by each n selection wire or pixel rows according to display of the present invention.For example, suppose that n is 5.When the typical frame per second of about 120Hz-190Hz, each segmentation can write in 1.1ms.For the XGA of 1024 row * 1024 row, each segmentation can 1024/5 or 205 lines or row composition.
For can operating routine field sequential color (FSC), whole 1024 lines need write in less than 3ms, and it is colored then to have only 2.5ms to be used for increase backlight.This just means that writing speed is that about every line or row are about 2.9ms.
In SFSC of the present invention handled, segmentation write in 1ms, was applied to light source increase colour and stay 4.5ms, this means that writing speed is every capable 4.8ms.This just makes that the writing speed (4.8ms) of SFSC is slower than the writing speed (2.9ms) of FSC.Because the segmentation ON time is longer than employed LCD or scattering material than slow-response.
In addition, because having comprised 1/3rd and the human eye of full-colour picture picture frame (for trichromatic system), subframe is difficult to observe image owing to extra 1/3rd variations that cause that each subframe increased.This just makes human eye can not see that flicker and subframe speed can be decreased to about 25Hz-30Hz from for example 120Hz.
Skilled artisan is appreciated that the only just explanation of above-mentioned numerical value in the industry, and different numerical value can appear in the quantity of other frame rate, resolution, color or the like, and all these embodiment within the spirit and scope of the present invention.
Continue step 908 after the step 906b, see Fig. 9 A.
Although method and display device have been discussed in conjunction with several embodiment, but this is not to attempt to be limited to the particular form that this paper sets forth, but it is opposite, it is attempted to cover this class change just, improves and equivalence, as may suitably being included in by in the defined the spirit and scope of the present invention of appended claim.It should be noted that title just is used to the purpose of organizing, and be not the scope of restriction discussion or claim.
Figure 10-have manufacture method of the display of MOV active component
Figure 10 has shown the manufacture method according to of the present invention liquid crystal device of use metal oxide varistor (MOV) as active component.In step 1005, upper and lower polaroid is provided, for example, shown in Figure 3 502 and 504.These polaroids have inside surface and outside surface.In step 1010, adopt conductive material, for example, ITO applies the inside of upper polarizer.In step 1015, datagraphic is corroded in conductive coating.Subsequently, in step 1020, the deposition light-scattering material.
In step 1025, corrosion or print drivers electrode and cell data and power electrode on the outside surface of following polaroid.In step 1030, make one group of first and second hole, and pass through polaroid.In step 1035, the metal oxide varistor active component prints subsequently or is installed in by descending first hole of polaroid, makes an electrode of active component reside in the inside surface of polaroid, but does not pass the plane of inside surface.In step 1040, with the passive element printing or be installed in second hole by following polaroid, make them to be suitable for but not through plane to the inside surface of Ah's polaroid.In step 1045, the inside of following polaroid can adopt conductive media to apply.This conductive media, as shown in Figure 5 526, make between active and passive element, to electrically contact.In step 1050, erosion unit figure in the conductive material that in step 1045, is deposited.
If this electrode pattern be not in step 1025 prior printing, step 1055 relates to and adopts conductive ink to be filled in down electrode pattern on the polaroid outside surface.The data of being printed in step 1025 and interconnection place of power electrode, in step 1060, printing or mask are crossed bridge electrode on the outside surface of following polaroid.Then, in step 1065, on the outside surface of following polaroid, print or utilize mask to make the gap bridge electrode pattern.Subsequently, in step 1070, upper and lower polarizer assembly is bonded together, and in step 1075, the data electrode figure on datagraphic on the upper polarizer and the following polaroid is interconnected.
Figure 11-be applicable to manufacture method of display with transistor active component
Figure 11 has shown the manufacture method of another example use transistor as the liquid crystal device of the present invention of active device use.Upper and lower polaroid is provided in step 1105.These polaroids have also comprised upper and lower substrate, and can have two inside and outside surfaces for the unit.In step 1110, the inside of upper polarizer adopts conductive material to apply, for example, and ITO.Subsequently, in step 1115, light scattering media 510 is deposited on the coat internal surfaces of upper polarizer.
In step 1120, corrosion or print drivers electrode and unit and data power electrode on the outside surface of following polaroid 504.In step 1125, make hole, and in step 1130, adopt conductive material to fill up subsequently by following polaroid.This conductive material has formed the conducting channel between the surfaces externally and internally of following polaroid.In step 1135, the inside of following polaroid adopts conductive media to apply, and this has formed and insert electrically contacting of conductive material in the hole in step 1125.The figure of unit with post-etching in 1135 in the coated conductive material, if do not print in advance in this step.
Subsequently, in step 1145, adopt conductive ink to be filled in down electrode pattern on the outside of polaroid, if not printing in advance in step 1120 part.In step 1150, electrode gap bridge figure prints or utilizes mask to be formed in down interconnection place of the external data power electrode of polaroid, and subsequently, in step 1155, printing or mask are crossed bridge electrode.In step 1160, active element transistors is installed, form be expert at and data electrode with by being electrically connected between the electric raceway groove of polaroid; This also can be included in data and drain electrode, grid and row, and being connected between source electrode and the raceway groove.Subsequently, in step 1165, with two mutual bondings of polarizer assembly.
The manufacture method of the display device of the transistor active component that Figure 12-use forms by printing
Figure 12 has shown the manufacture method according to of the present invention display device of another example use transistor as active component.In step 1205, on the outside surface of substrate, print upper polarizer.In step 1210, the inside of this substrate adopts conductive material to apply, for example, and ITO.In step 1215, on conductive material, deposit light-scattering material.Subsequently, in step 1220, adopt conductive material layer to apply light-scattering material.
Subsequently, in step 1225, provide subtegulum, and under printing on the subtegulum polaroid, utilize mask or print the hole by electric conductor and print format graphics.In step 1230, on the outside surface of following polaroid, print actuator electrode and unit and power electrode.In step 1235, adopt the hole of conductive material filling subsequently, be formed on the electric raceway groove between inside surface and the outside surface thereupon by subtegulum.Then in step 1240, on the outside surface of subtegulum, print or utilize mask manufacture electrode gap bridge figure, in step 1245, will cross bridge electrode printing or mask on substrate thereupon.Subsequently, in step 1250, active element transistors is installed, form be expert at and data electrode and electric raceway groove between electrically contact; These also can be included in drain electrode and data, grid and row, and being connected between source electrode and the raceway groove.Subsequently, in step 1255, will go up subtegulum/polaroid and be bonded together mutually.
The method of the existing display of Figure 13-improvement
Wish the available liquid crystal display device to be modified into consistent too with the present invention.Figure 13 has shown a kind of method of improving the available liquid crystal display device.In step 1305,, can decompose existing LCD, comprising polaroid, conductive layer (ITO), frictional layer and color-filter layer (as what Fig. 1 discussed) by removing substrate assembly.In step 1310, from the subtegulum assembly, remove transistor, and alternative comes along and removes at this on-chip frictional layer up to 2/3rds.Subsequently, in step 1315, light-scattering material is coated on the surface, inside of subtegulum.Then, in step 1320, last substrate assembly is reinstalled, and includes only polaroid, substrate itself.And conductive layer (ITO) and selectable frictional layer.
Claims (30)
1. a display device is characterized in that, this device comprises:
Polaroid; With,
Light-scattering material is arranged on the transmission path between described polaroid and the polarized light source, and wherein, described light-scattering material can switch to second state from first state in response to the electric field that is applied; Wherein, described light source comprises multiple controlled color separately.
2. display device as claimed in claim 1 is characterized in that, described light-scattering material comprises polymer dispersed liquid crystal (PDLC).
3. display device as claimed in claim 1 is characterized in that, this device also comprises the conductive material that is arranged on substantially transparent between described polaroid and the described light-scattering material.
4. display device as claimed in claim 3 is characterized in that the conductive layer of described substantially transparent is arranged on the described polaroid.
5. display device as claimed in claim 3 is characterized in that, the conductive layer of described substantially transparent is tin indium oxide (ITO) layer.
6. display device as claimed in claim 1 is characterized in that, in described first state, described light-scattering material is unscattered substantially, and in described second state, described light-scattering material is basic scattering.
7. display device as claimed in claim 1 is characterized in that, described light-scattering material comprises to the row curve aims at phase (NCAP) polymer dispersed liquid crystal system.
8. a display device is characterized in that, this device comprises:
First and second polaroids;
Light-scattering material is arranged between described first and second polaroids; With,
Light source has multiple color, and wherein, the described light-scattering material of part can carry out the operation of selective excitation; Wherein, the amount that excites the color of light that can be used to control the described multiple color of sending by described display device of part light-scattering material.
9. display device as claimed in claim 8 is characterized in that, this device also comprises:
Be arranged on the conductive layer of first and second substantially transparents between described first and second polaroids, wherein, the described electric field that is applied between the counterpart that is included in the described first and second substantially transparent conductive layers that excites of described part light-scattering material.
10. display device as claimed in claim 8 is characterized in that, described first polaroid forms substrate, and wherein, described liquid crystal display device also comprises and is installed in described on-chip drive circuit.
11. display device as claimed in claim 8 is characterized in that, described second polaroid forms substrate, and wherein, described display device also comprises the active component that is embedded in the described substrate.
12. display device as claimed in claim 11 is characterized in that, described active component is a rheostat.
13. display device as claimed in claim 8 is characterized in that, described light-scattering material comprises the polymer dispersed liquid crystal.
14. a method of making display device is characterized in that the method comprising the steps of:
First and second polaroids are provided, and wherein, described first and second polaroids comprise first and second layers separately;
Adopt conductive material to apply the described second layer of described first polaroid; With,
Between described first and second polaroids, deposit light-scattering material.
15. method as claimed in claim 14 is characterized in that, this method also comprises step:
On described second polaroid, form the hole; With,
On the described second layer of described second polaroid, form driver and electrode.
16., it is characterized in that described second polaroid comprises the 3rd layer as claim 14 or 15 described methods, wherein, described method also comprises step:
On described the 3rd layer of described second polaroid, print active component.
17., it is characterized in that this method also comprises step as claim 14 or 15 or 16 described methods:
Adopt conductive material to apply the described ground floor of described second polaroid; With,
The unit figure of corrosion on the described ground floor of described second polaroid.
18., it is characterized in that this method also comprises step as claim 14 or 15 or 16 or 17 described methods:
On the described ground floor of described second polaroid, print the gap bridge insulation patterns; With,
On the described ground floor of described second polaroid, print the gap bridge electrode pattern.
19. method as claimed in claim 14 is characterized in that, described light-scattering material comprises the polymer dispersed liquid crystal.
20. a display device is characterized in that, this device comprises:
Polaroid; With,
The lip-deep light-scattering material of described polaroid is set.
21. display device as claimed in claim 20 is characterized in that, described light-scattering material is configured to receive polarized light.
22. display device as claimed in claim 21 is characterized in that, this display device also comprises the light source of being made up of a plurality of independent controllable color, and described light source can work as the source of described polarized light.
23. display device as claimed in claim 21 is characterized in that, this display device also comprises second polaroid, and it is positioned at described light-scattering material and has between the light source of multiple independent controllable color.
24. the method for a displayed map picture frame is characterized in that, the method comprising the steps of:
(a) addressing subframe segmentation; With,
(b) flasher; Wherein, described light source comprises a plurality of controlled parts separately, and wherein, described subframe comprises one or more described subframe segmentations, and the part of described independent control is corresponding to described subframe segmentation, and wherein, described picture frame comprises the structure of a plurality of subframes.
25. method as claimed in claim 24 is characterized in that, this method also comprises step:
(c) and (b) to each segmentation repeating step (a) of described subframe.
26. method as claimed in claim 25 is characterized in that, this method also comprises each subframe repeating step (c) to described structure.
27., it is characterized in that described each independent controlled segmentation comprises first color of first subframe that is used for described picture frame and is used for second color of second subframe of described structure as claim 24 or 25 or 26 described methods.
28. method as claimed in claim 24 is characterized in that, described segmentation comprises full subframe.
29. one kind is applicable to the method for improving the available liquid crystal display device, this device comprises upper and lower substrate assembly, it is characterized in that, the described substrate assembly of going up comprises polaroid, substrate, conductive layer, and described subtegulum assembly comprises a plurality of transistors, and the method comprising the steps of:
Remove the described substrate assembly of going up;
From described subtegulum assembly, remove nearly 2/3rds transistor;
On the surface, inside of described subtegulum assembly, deposit light-scattering material;
At described subtegulum assembly, install substrate assembly polaroid, substrate and conductive layer.
30. method as claimed in claim 29 is characterized in that, described subtegulum assembly comprises frictional layer, and this method also comprises step:
From described subtegulum assembly, remove described frictional layer.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US38823702P | 2002-06-13 | 2002-06-13 | |
| US60/388,237 | 2002-06-13 | ||
| US60/443,053 | 2003-01-28 | ||
| US60/446,304 | 2003-02-10 |
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| CN1692397A true CN1692397A (en) | 2005-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03819289 Pending CN1692397A (en) | 2002-06-13 | 2003-06-13 | A field sequential display device and methods of fabricating same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405162C (en) * | 2005-12-09 | 2008-07-23 | 比亚迪股份有限公司 | Liquid-crystal display |
| CN100464219C (en) * | 2007-03-28 | 2009-02-25 | 友达光电股份有限公司 | Color sequential display device with back-light time delay control and its controlling method |
| CN101447174B (en) * | 2007-11-27 | 2011-03-16 | 立景光电股份有限公司 | Display method for color sequential display |
| CN104280934A (en) * | 2014-10-27 | 2015-01-14 | 深圳市华星光电技术有限公司 | Liquid crystal panel and manufacturing method thereof |
| CN106257325A (en) * | 2015-06-18 | 2016-12-28 | 烽腾科技有限公司 | For TFT inspection high-resolution and be switched fast electro-optic modulators |
| CN107092049A (en) * | 2017-06-14 | 2017-08-25 | 苏州艾力光电科技有限公司 | A kind of light polarization component |
| CN107516486A (en) * | 2016-06-16 | 2017-12-26 | 中兴通讯股份有限公司 | The display methods and device of image |
| CN109656043A (en) * | 2019-02-01 | 2019-04-19 | 腾讯科技（深圳）有限公司 | Display device and image display method |
-
2003
- 2003-06-13 CN CN 03819289 patent/CN1692397A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405162C (en) * | 2005-12-09 | 2008-07-23 | 比亚迪股份有限公司 | Liquid-crystal display |
| CN100464219C (en) * | 2007-03-28 | 2009-02-25 | 友达光电股份有限公司 | Color sequential display device with back-light time delay control and its controlling method |
| CN101447174B (en) * | 2007-11-27 | 2011-03-16 | 立景光电股份有限公司 | Display method for color sequential display |
| CN104280934A (en) * | 2014-10-27 | 2015-01-14 | 深圳市华星光电技术有限公司 | Liquid crystal panel and manufacturing method thereof |
| CN106257325A (en) * | 2015-06-18 | 2016-12-28 | 烽腾科技有限公司 | For TFT inspection high-resolution and be switched fast electro-optic modulators |
| CN106257325B (en) * | 2015-06-18 | 2021-06-11 | 奥宝科技有限公司 | High resolution and fast switching electro-optical modulator for TFT inspection |
| CN107516486A (en) * | 2016-06-16 | 2017-12-26 | 中兴通讯股份有限公司 | The display methods and device of image |
| CN107092049A (en) * | 2017-06-14 | 2017-08-25 | 苏州艾力光电科技有限公司 | A kind of light polarization component |
| CN109656043A (en) * | 2019-02-01 | 2019-04-19 | 腾讯科技（深圳）有限公司 | Display device and image display method |
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