CN100464219C - Color sequential display device with back-light time delay control and its controlling method - Google Patents
Color sequential display device with back-light time delay control and its controlling method Download PDFInfo
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- CN100464219C CN100464219C CNB2007100888075A CN200710088807A CN100464219C CN 100464219 C CN100464219 C CN 100464219C CN B2007100888075 A CNB2007100888075 A CN B2007100888075A CN 200710088807 A CN200710088807 A CN 200710088807A CN 100464219 C CN100464219 C CN 100464219C
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Abstract
A display of color sequence type consists of a liquid crystal face plate, a back light source, a driving circuit for generating pixel voltage to drive said liquid crystal face plate and a back light time delay control unit for delay-regulating close time point of back light source, setting said close time point in next sub-frame and using said delay close function to make liquid crystal display have excellent uniformity of picture.
Description
Technical field
The present invention is about a kind of LCD, the color sequential display device (Color Sequential Display) that refers to a kind of tool back-light time delay control especially with and control method.
Background technology
General LCD colour mixture addition process commonly used can be divided into two big classes, one is spacing color mixed method such as colored filter (Color Filter) technology, it mainly is to utilize spatially to make colour mixture, because each pixel is by the sub-pixel formation of three primary colors (RGB).When trichromatic sub-pixel during,, can obtain the effect of colour mixture addition by the luminance brightness power of control by the three primary colors sub-pixel less than the distinguishable scope of human eye.An example traditional liquid crystal panel 10a as shown in Figure 1a promptly adopts the colorized optical filtering chip technology to constitute arbitrary frame 120.Because of having filter coating 102a, 103a and the 104a of Red Green Blue on the colored filter respectively, after it shines via a backlight, by the luminance brightness power of liquid crystal 100a control by this three primary colors sub-pixel, obtain required ruddiness 110a, green glow 111a and blue light 112a, to obtain the effect of colour mixture addition.Another kind is sequential mixed-color method such as look preface formula technology, mainly be to utilize on time shaft, to make colour mixture, be common in color sequential display device (Color Sequential Display) and also claim field sequence type display (Field Sequential Display) or netrual colour optical filter display (Color Filter-less Display).Sequential colour mixture ratio juris is to utilize in human eye can produce the time of persistence of vision, switch image or the frame (Frame) of three primary colors (RGB) light source respectively according to sequential with a synthetic colour, also be about to trichromatic colourity and cut in regular turn respectively in three different display time intervals or subframe (Sub-frame), but show in the same pixel.By three primary colors are switched in regular turn fast, if when being shorter than the distinguishable time range of human eye switching time, then human eye just can't be seen three primary colors, but sees a colour mixture effect.The display of a picture frequency 60Hz for example, needed its trichromatic switching time within 1/180 second, cuts in regular turn respectively in three different display time intervals or subframe (Sub-frame) to show in the same pixel.Because the influence that human eye vision persists causes the three primary colors of existing three different light intensity degree in 1/60 second to overlap together, can obtain riotous with colour display effect.
Please refer to Fig. 1 b, it is that a liquid crystal panel 10b adopts look preface formula technology to form this frame 120.Wherein three primary colors (RGB) backlight time that will form this frame 120 further is divided into three sections display time intervals according to different colored light sources, as first subframe 121, second subframe 122 and the 3rd subframe 123, to penetrate red light source 107b, green light source 108b and blue-light source 109b respectively in regular turn, and be apparent in fast in each pixel, then determine the degree that manifests of each pixel again by the reaction of liquid crystal 100b, to form image by three primary colors (as numbering 110b, 111b and 112b) colour mixture superposition.
In addition, look preface formula technology and traditional color filter have following advantage in comparison:
(1) has higher resolution: because of look preface formula technology does not have the problem of color resistance of color filter (ColorResisters), so can improve the spatial resolution of panel pixel.Because the light consume that does not have the look resistance to be caused penetrates efficient (Transmittance) so can improve, as being 27% raising nearly 100% with script substrate penetrance.
(2) cost reduction: saved colored filter because of look preface formula technology, made simple structureization, except saving the assembly cost, can omit the operation of optical filter coating, making on making, other can reduce work hours and improve yield.
(3) reduce drive integrated circult: drive integrated circult is to make the liquid crystal molecule in the panel pixel produce permutations by output voltage, and then the transmittance of controlling each pixel just constitutes picture displayed.Look preface formula technology can reduce thin film transistor (TFT) number required in the single pixel, so complexity that can simplified control circuit helps improving the spatial resolution of panel pixel.
(4) preferable colour balance adjustment:, can do the color adjustment with regard to each arbitrary source, so that color balance is more even on the whole front panel because used independently light source.
Yet, being noted that the picture display frequency of traditional stable twisted nematic TN (Twisted Nematic) liquid crystal panel is 60Hz, its liquid crystal drive voltage is that every 16.67ms changes once, gets final product so as long as its liquid crystal, arrives current potential at this signal before changing.In comparison, the liquid crystal drive voltage of color sequential liquid crystal display is about every 5.56ms and changes once, that is the time that is equivalent to each subframe is long, but 5.56ms during this period of time in also to comprise time of backlight unlatching, so can allow that the time of liquid crystal reaction is shorter, finish because liquid crystal must react before backlight is opened.
The restriction of liquid crystal reaction velocity is the problem of the technical maximum of present look preface formula.As adopt look preface formula technology, and need the picture level that nearly three times response speed just can reach conventional liquid crystal, on behalf of the reaction time of color sequential display device, this also to shorten to 1/3rd of script traditional monitor in theory.If the liquid crystal reaction velocity of color sequential display device is fast inadequately, then can produce following point:
(1) gamma (Gamma) curve is in the GTG drift: gamma curve is the relation curve that is used to show different GTGs and brightness, and it can directly have influence on the gradually layer effect of display picture.If liquid crystal has different reaction velocitys at different GTGs, can cause gamma (Gamma) curve in the GTG drift.
(2) panel luminance is inhomogeneous: as shown in Figure 2, it is the synoptic diagram of the panel gated sweep mistiming of LCD, this panel comprises the top pixel region 202, one intermediate pixel zone 203 and one is pixel region 204 bottom, a cause wherein gated sweep driving circuit 200 is got off by the different sequence scannings of its horizontal scan line one row one leu, the driving frequency of 180Hz though the reaction time of liquid crystal can arrange in pairs or groups, but because of this topmost pixel region 202 and sweep time of existing between the pixel region 204 bottom poor, the rough time that equals the liquid crystal reaction, though therefore can cause the liquid crystal of this top pixel region 202 to react completely, but the reaction of the liquid crystal of pixel region 204 is incomplete as yet bottom, thereby causes the phenomenon of panel upper-lower position brightness irregularities.
Fig. 3 is for existing the coordinate synoptic diagram of gated sweep mistiming in the known liquid crystal panel shown in Figure 2, wherein the transverse axis of this coordinate is a time shaft, and its longitudinal axis is represented penetrance (Transmittance).In the demonstration time 307 of each subframe, all comprise three periods such as stand-by period 302 of sweep time 301, liquid crystal reaction of this scan drive circuit and backlight open time 303.From sweep time 301, put T1 the initial separately sweep time that can find the 1st controlling grid scan line G001 of this panel and the 160th controlling grid scan line G160, between the T2 with regard to once-existing difference, react (being that curve rises) through waiting time 302 gradually to treat liquid crystal again, arrive 303 o'clock backlight open time afterwards, because of the 160th the later scanning of controlling grid scan line G160, so panel lower end liquid crystal is as still unreacted is complete, difference zone A3 as shown in Figure 3 will appear, make this panel upper and lower side pixel region have the inconsistent situation of penetrance, that is the pairing penetrance of controlling grid scan line G001 is greater than the pairing penetrance of controlling grid scan line G160.
Other sees also Fig. 4, and a kind of use black insertion technology is described, and (Black Data Insertion Technology, each controlling grid scan line is to the coordinate diagram that concerns between liquid crystal reaction time and the penetrance in known LCD BDI).This LCD through the black plug time 400 (or claim RESET time) after, because the sweep time of each grid, difference added that the liquid crystal reaction time is fast inadequately, when roughly reacting, finishes panel the top pixel region (as controlling grid scan line G001), but its lower end pixel region (as controlling grid scan line G160) still unreacted is finished, just black plug will be carried out and backlight is closed, so make the upper and lower side brightness irregularities of liquid crystal panel.And when black plug, liquid crystal also needs the scanning of time response with corresponding next subframe, thereby cause after the black plug, related influence is when each grid scans in this next subframe, the reaction time of liquid crystal is delayed especially, cause liquid crystal panel each regional light transmittance variation and inconsistent up and down, make brightness irregularities.
Other sees also Fig. 5, and it is that a kind of known LCD adopts the liquid crystal time of while black plug and the coordinate graph of a relation of penetrance.In the demonstration time 507 of a subframe, scan drive circuit scans (from controlling grid scan line G001 to G160) in regular turn in the one scan time 501, and through the stand-by period 502, after liquid crystal reacts completely, after the backlight open time 503, all sweep traces to this gated sweep driving circuit in the black plug time 500 are imported a black frame insertion signals simultaneously.See also Fig. 6, it is employing the liquid crystal time and the penetrance graph of a relation of black plug in regular turn of another kind of LCD.The difference of this Fig. 6 and Fig. 5 is in when using black insertion technology, imports a black frame insertion signals at sweep trace in regular turn.Earlier figures 5 and LCD shown in Figure 6, when fast inadequately, all the meeting that can occur mentioning as Fig. 4 causes the panel problem of regional brightness irregularities up and down as liquid crystal reaction time of its panel.
Summary of the invention
Therefore,, the invention provides a kind of color sequential display device of controlling the time backlight, be used for improving the brightness uniformity of each distributed areas on its panel for improving the problems referred to above.Adjust the time point of turning off backlight by delay control unit backlight, greatly about the addressing time of next sub-graph data address date, it is poor because of the sweep time of sweep trace to improve panel as this time point of turning off backlight, causes the panel problem of brightness disproportionation up and down.
For reaching aforementioned goal of the invention, the invention provides a kind of color sequential display device of tool back-light time delay control, by by a liquid crystal panel, a backlight, one source pole data drive circuit providing a data line voltage, a gated sweep driving circuit providing one scan line voltage, a backlight control circuit driving backlight, and a delay control unit backlight is to adjust shut-in time point backlight.According to the color sequential display device of tool back-light time delay control of the present invention, the data line of the sweep trace of this gated sweep crystal drive circuit and source electrode data drive circuit is connected to the pixel electrode on the liquid crystal panel.This pixel electrode is made up of thin film transistor (TFT), the function of this thin film transistor (TFT) such as same switch.When this gated sweep crystal drive circuit and source electrode data drive circuit respectively by sweep trace and data line output scanning line voltage (or claiming signal) when giving the thin film transistor (TFT) of this pixel electrode with data line voltage, the switch of this sweep trace Control of Voltage thin film transistor (TFT), this data line voltage will write liquid crystal capacitance on the liquid crystal panel with decision liquid crystal molecule steering angle.When thin film transistor (TFT) cuts out, form a high impedance, can prevent the leakage of data line voltage.Yet this liquid crystal capacitance can't remain to voltage next time when upgrading data line voltage, so this liquid crystal capacitance can a storage capacitors in parallel extremely upgrade to keep this signal voltage next time.Therefore, this gated sweep crystal drive circuit and source electrode data drive circuit can produce the pixel voltage that drives this liquid crystal panel, wherein this pixel voltage comprises one first voltage and one second voltage at least to switch the keying of pixel, and make aforementioned each subframe be divided into one first time zone and one second time zone, wherein this first voltage drives in first time zone, and this second voltage drives in second time zone.And backlight control circuit is used to drive backlight and produces the three primary colors light source in regular turn in a plurality of subframes that constitute a frame, to form an image output.Utilizing this delay control unit backlight to export an inhibit signal gives this backlight control circuit to adjust backlight shut-in time point, begin between the end of extent in second o'clock as first time zone, improve sweep time poor and liquid crystal reaction velocity caused the brightness irregularities of panel because of sweep trace in the first subframe time.
In addition, the invention provides a kind of control method, be used to postpone to control the time backlight of a color sequential display device, wherein each frame of this color sequential display device generation is divided into one first subframe and one second subframe at least, and aforementioned each subframe is divided into one first time zone and one second time zone according to sequential, comprises:
Open a backlight on the time point in first subframe;
According to a preset period of time, the shut-in time point of this backlight of decision between the first time zone end of scan of second o'clock end of extent to the second subframe of first subframe; And
According to the shut-in time point of this backlight, postpone output one backlight drive signal to this backlight, to postpone the shut-in time of this backlight.Therefore, shut-in time of backlight point is delayed to next subframe, can makes the liquid crystal reaction velocity that comes from backlight when not enough, can be arranged, the long opening time to supply the homogeneity of its panel luminance.
Description of drawings
Fig. 1 a and Fig. 1 b are traditional color filter technology and look preface formula technology synoptic diagram;
Fig. 2 is the synoptic diagram of the panel gated sweep mistiming of LCD;
Fig. 3 is for existing the coordinate synoptic diagram of gated sweep mistiming in the liquid crystal panel of Fig. 2;
Fig. 4 is that each controlling grid scan line of LCD is to the coordinate diagram that concerns between liquid crystal reaction time and the penetrance;
Fig. 5 is employing simultaneously the liquid crystal time of black plug and the coordinate graph of a relation of penetrance of LCD;
Fig. 6 is employing the liquid crystal time of black plug and the coordinate graph of a relation of penetrance in regular turn of LCD;
Fig. 7 is the functional block diagram of color sequential display device of the present invention;
Fig. 8 inspects figure for the structural outline of color sequential display device of the present invention;
Fig. 9 a and Fig. 9 b are the coordinate diagram that concerns between liquid crystal reaction time of color sequential display device of the present invention and the penetrance;
Figure 10 is the illustrative view of each controlling grid scan line of color sequential display device first embodiment of the present invention;
Figure 11 is the coordinate diagram in the pairing liquid crystal reaction time of each controlling grid scan line of color sequential display device of the present invention shown in Figure 10;
Figure 12 is the detection synoptic diagram of the backlight opening time selected element of color sequential display device of the present invention shown in Figure 10.
Figure 13 is the illustrative view of each controlling grid scan line of color sequential display device second embodiment of the present invention;
Figure 14 is the synoptic diagram in the liquid crystal reaction time of color sequential display device of the present invention second embodiment shown in Figure 13;
Figure 15 is the detection synoptic diagram of the backlight opening time selected element of color sequential display device of the present invention second embodiment shown in Figure 13;
Figure 16 is the process flow diagram of control method of the present invention, and this method postpones the time backlight of control one color sequential display device.
Wherein, Reference numeral:
10a tradition liquid crystal panel
10b look preface formula liquid crystal panel
100a, 100b liquid crystal
The red filter coating of 102a
The 103a green filter film
The blue filter coating of 104a
The red backlight of 107b
108b green colored backlights source
The blue backlight of 109b
110a, 110b ruddiness
111a, 111b green glow
112a, 112b blue light
120 1 frames
121,901,1001,1,301 first subframes
122,902,1002,1,302 second subframes
123 the 3rd subframes
200,705 gated sweep driving circuits
706 source electrode data drive circuits
202 panels are pixel region topmost
203 panel intermediate pixel zones
204 panels are pixel region bottom
400,500,600,1004, the 1304 black plug times
301, the sweep time of 401,501,601,1003,1303 scan drive circuits
302, the stand-by period of 402,502,602 liquid crystal reaction
303,403,503, the 603 backlight opening times
A3 difference sweep time zone
307,407,507,607,1100, the 1400 one subframe times
The 1st controlling grid scan line of T1 begins scan start point
The 160th controlling grid scan line of T2 begins scan start point
The 1st controlling grid scan line of G001
The 80th controlling grid scan line of G080
The 160th controlling grid scan line of G160
The 1st sweep trace of the grid in G001a first time zone
The 1st sweep trace of the grid in G001b second time zone
The 80th sweep trace of the grid in G080a first time zone
The 80th sweep trace of the grid in G080b second time zone
A1 first selected element
B2 second selected element
C3 the 3rd selected element
The 1st sweep trace scan start point of S001 grid
The 80th sweep trace scan start point of S080 grid
The 160th sweep trace scan start point of S160 grid
1101,1401 LCD update times
T backlight time delay
BFI black plug time point
1201,1501 luminance difference curves
1202,1502 briliancy curves
1203,1503 higher brightness
1204,1504 preferable picture brightness consistance
701 delay control units backlight
702 backlight control circuits
703 backlights
704 liquid crystal panels
801 driving circuits
804 second polarizing coatings
805 light emitting diode matrixs
806 second glass substrates
807 thin film transistor (TFT)s
808 common electrodes
809 first glass substrates
810 first polarizing coatings
811 data lines
812 sweep traces
813 light guide plate/diffuser plate
814 pixel electrodes
The BL_ON backlight opening time
S162, S164 and S166 are all method step
Embodiment
Please earlier with reference to Fig. 7, it is the functional block diagram according to the color sequential display device of a kind of tool back-light time delay control of one first preferred embodiment of the present invention.This color sequential display device comprises a liquid crystal panel 704, a backlight 703, one source pole data drive circuit 705, a gated sweep driving circuit 706, a backlight control circuit 702 and a delay control unit 701 backlight.Three primary colors (RGB) backlight 703 in three subframes that constitute each frame, switches the unlatching of three primary colors light source to inject this liquid crystal panel 704 according to sequential as being light emitting diode matrix (LED Array) respectively.Source electrode data drive circuit 705 provides the data line voltage of a decision liquid crystal molecule steering angle.Gated sweep driving circuit 706 provides sweep trace voltage to give each sweep trace on this panel 704 in regular turn.Backlight control circuit 702 is for providing a backlight driving voltage to backlight 703, to produce three primary colors light source (being ruddiness, green glow, blue light) respectively.Delay control unit 701 backlight provides an inhibit signal to the shut-in time point of this backlight control circuit 702 with the delay backlight according to a predetermined sequential.
Yet application of the present invention is not limited to the three primary colors light source, that is spendable additional light source number and unrestricted, is actually and can sets according to need.For example also can via five kinds of coloured light of RRGBB or by four kinds of coloured light of RGGB in addition mixed light just use the above light emitting diode matrix of three kinds of colors to reach to reach white light.Because with regard to the angle that color shows, the colour gamut of display is wider, and the ability of representing its color to show is stronger.For the colour gamut that increases, can utilize with three primary colors (RGB) light source is homochromy and light source that predominant wavelength is different as additional additional light source.At this, homochromy definition is cognitive identical with general color science.But the selection of additional light source is not limited to this, and the light source of other color beyond the three primary colors also can use, for example dark green (cyan) light, or gold-tinted (Y).Even with three primary colors (RGB) light source one of them has same predominant wavelength and can also adopt, with regard on the color science, i.e. the phenomenon of metamerism, that is the homochromy coloured light of identical predominant wavelength is variant on frequency spectrum, causes the chromaticity coordinates difference.No matter be to adopt predominant wavelength difference or identical light source as additional light source, its chromaticity coordinates must be different with three primary colors (RGB) light source.In addition, the chromaticity coordinates of additional light source must drop on three primary colors (RGB) light source outside the colour gamut that chrominance space surrounded, and the effect that enlarges colour gamut is just arranged.
Please with further reference to Fig. 7 and Fig. 8, Fig. 8 inspects figure for the structural outline of the color sequential display device of a preferred embodiment of the present invention.Foregoing liquid crystal panel 704 further has a common electrode 808 and is arranged on one first glass substrate 809, and at least one pixel electrode 814 is arranged on one second glass substrate 806, with the thin film transistor (TFT) 807 that connects a correspondence.Wherein a storage capacitors (not shown) is coupled to aforementioned pixel electrode 814 and common electrode 808, or each pixel electrode 814 itself promptly has capacity effect, uses the maintenance potential state, is used for and common electrode 808 inductions, reverses to control its liquid crystal molecule.Between this panel 704 and backlight 703, light guide plate/diffuser plate 813 can be set further, with the light source that guides backlight 703 to be provided, towards same dispersal direction, light source is evenly distributed, use again as 804 of first polarizing coating 810 and second polarizing coatings the light source polarization.
Driving circuit 801 comprises source electrode data drive circuit 705 and gated sweep driving circuit 706, is connected with common electrode 808 with aforementioned pixel electrode 814 respectively.Because of pixel electrode 814 is made up of thin film transistor (TFT) 807, and the function of this thin film transistor (TFT) is switched switch as one, so seeing through data line 811, source electrode data drive circuit 705 is connected with the source electrode of thin film transistor (TFT) 807, and gated sweep driving circuit 706 is connected with the grid of thin film transistor (TFT) 807 by sweep trace 812, with the open and close of control TFT 807.
When gated sweep driving circuit 705 and source electrode data drive circuit 706 receive the indication that needs the driving liquid crystal, can export an one scan line voltage and a data line voltage by its sweep trace 812 respectively with data line 811 separately, the switch of this sweep trace voltage (or claiming a signal) this thin film transistor (TFT) 807 of may command wherein, and this source electrode data drive circuit 705 by its data line 811 and thin film transistor (TFT) 807 to control the light intensity of each single pixel, its principle is that this data line voltage is write a liquid crystal capacitance (liquid crystal is clipped in and forms a parallel plate capacitor between this two glass plate 806,809) with decision liquid crystal molecule steering angle.When this thin film transistor (TFT) 807 is closed, can form a high impedance, prevent the leakage of data line voltage.Yet the data line voltage that this liquid crystal capacitance can't remain to voltage next time upgrades, so this liquid crystal capacitance can this storage capacitors in parallel extremely upgrade to keep this data line voltage next time.Through above-mentioned start, can produce a voltage difference (promptly be called one first voltage, treat the back detailed description) between this pixel electrode 814 and the common electrode 808, the light source that the go to action that utilizes this voltage difference can change liquid crystal molecule improves backlight 703 passes through intensity.Otherwise, reset period such as black plug (BDI) in the period one, utilize the pressure reduction modulation of common electrode 808 to produce another voltage difference (promptly be called one the 2nd voltage, treat back describe in detail), the light source to reduce backlight 703 that turns to that changes liquid crystal molecule again passes through intensity.
Because the color of the opening time of this backlight 703 point and light source needs to carry out synchro control by the data scanning of liquid crystal panel 704 based on the generation of image data, so after this backlight control circuit 702 receives a synchronous control signal, can drive backlight 703 and produce the three primary colors light source in regular turn in the frame time of an image, form an image output.Control by backlight control circuit 702, switch the different colours light of the three primary colors light source (as light emitting diode matrix) 805 of backlight 703 respectively, distinctly to inject to a frame (Frame) is divided in the display time interval separately of three subframes, to form the mixed light image.In addition, utilize delay control unit 701 backlight further to control the shut-in time of backlight 703, the shut-in time point of backlight 703 is crossed between two subframes, approximately be when next sub-frame data address date addressing or just backlight 703 closed afterwards, with compensation as the luminance shortage zone.Delay control unit 701 backlight can use a kind of delay hardware circuit or software, the default opening time (opening back 3.9ms as the panel first grid) according to the default display time interval (as 5.56ms) or the backlight 703 of each subframe is come timing, with the best shut-in time point (as opening more than the 5.56ms of back) of reaching backlight 703, can cross between the display time interval of two subframes greater than the panel first grid.
Fig. 9 a and Fig. 9 b are liquid crystal time of color sequential display device of a preferred embodiment of the present invention and the coordinate graph of a relation between the penetrance, wherein Fig. 9 a represents a kind of use LCD of black plug in regular turn, and Fig. 9 b represents the another kind of LCD of black plug simultaneously of using.With known Fig. 4 in comparison, the present invention by with the backlight shut-in time from one first subframe 901a, 901b is extended to next subframe 902a, in the display time interval of 902b, each gated sweep (G001a to G160a or G001b to G160b) that can compensation panel is through the black plug time, because of the reaction time of liquid crystal not enough, the problem of the brightness irregularities that is caused.
Figure 10 is the synoptic diagram of color sequential display device first embodiment of the present invention.In each subframe each gated sweep is driven, in the display time interval as first subframe 1001, can be divided into first time zone and second time zone.In first time zone, this gated sweep driving circuit sends a signal and opens with this thin film transistor (TFT) that drives on the panel, make and produce a pressure reduction between pixel electrode and the common electrode, be first voltage, be used to reverse liquid crystal molecule to allowing the expection light transmission capacity, for example with regard to the 1st controlling grid scan line, G001a is its first time zone, with regard to the 80th controlling grid scan line, G080a is its first time zone; Opposite, in second time zone, the pressure reduction that produces between this pixel electrode and the common electrode is the voltage of liquid crystal reset, be second voltage, be used to reverse liquid crystal molecule to not allowing printing opacity, wherein this second voltage comes the pressure reduction of this common electrode of modulation with the storage capacitors that is coupled to pixel electrode and common electrode and produces, and perhaps also common electrode can be divided into a plurality of zones, produces with the subregion modulation.The polarity of this first voltage and second voltage each other oppositely also or in the same way, and next frame polarity generally can be opposite with former frame polarity, or just counter-rotating every 3 subframes after, so if can design the various polarity conversion among continuous 6 subframes; As shown in figure 10, G001a is first time zone of the 1st controlling grid scan line, and G001b is second time zone of the 1st controlling grid scan line, and G080a is first time zone of the 80th controlling grid scan line, and G080b is second time zone of the 80th controlling grid scan line.If with a scan drive circuit with 160 sweep traces is example, one gated sweep driving circuit drives pixel electrode and common electrode to produce first voltage in regular turn via 160 sweep traces of the 1st sweep trace to the, and then impel liquid crystal reaction transition, to allow the light printing opacity of backlight.In its first time zone separately of each gated sweep, because of having the one scan mistiming between the 1st sweep trace G001 of grid and the 160th sweep trace G160, this mistiming is caused the inconsistent situation of panel upper and lower side penetrance, that is penetrance (G001)〉penetrance (G160).Yet this moment as this delay control unit backlight of utilization are exported an inhibit signal to backlight control circuit, can produce into the effect of a backlight late release.This Figure 10 further introduces the application of following three kinds of different backlight shut-in times, one is positioned at the first selected element A1 for backlight shut-in time point, promptly its first time zone of each gated sweep of the first subframe time begins between the end of extent in first o'clock, with compensation panel brightness.After its end of extent in first o'clock, when desire is carried out black plug (i.e. second time zone), this gated sweep driving circuit drives 160. sweep traces of the 1st sweep trace to the simultaneously, allow driving pixel electrode and common electrode produce second voltage simultaneously, export a black picture to impel liquid crystal to react transition, and once-existing difference of the second time zone G080b of second time zone G001b of the 1st sweep trace of grid and the 80th sweep trace.Its two, when with backlight shut-in time point due to the second selected element B2, promptly second time zone of the first subframe time begins to begin between the scanning to first time zone of the second subframe time, and is not enough with compensation liquid crystal reaction velocity, the luminance difference that is caused.When behind the black plug during,, cause brightness irregularities because of the mistiming of front and back sweep trace to next subframe 1002.Its three, when its some backlight shut-in time due to the 3rd selected element C3, behind promptly first of the first subframe time o'clock domain scanning to the first time zone end of scan of the second subframe time between, with compensation panel brightness.For the shut-in time of guaranteeing this backlight is put the 3rd selected element C3 that drops between first subframe and second subframe, can utilize variety of way to carry out.For example, it is the shut-in time backlight that the time point at the beginning in first time zone of each subframe is added meter one preset period of time, and to make this preset period of time be display time interval (as greater than getting final product more than the 5.56ms) greater than each subframe.The data of this preset period of time can prestore earlier and read for this delay control unit backlight in the memory storage unit.
Please refer to Figure 11, Figure 11 is the coordinate diagram in the pairing liquid crystal reaction time of each controlling grid scan line of color sequential display device shown in Figure 10, and its transverse axis is a time shaft, and unit is a millisecond, and the longitudinal axis is a penetrance, and its unit is a number percent.BL_ON represents the unlatching period of backlight.S080 represents the scan start point of the 80th sweep trace of grid; S160 represents the scan start point of the 160th sweep trace of grid.Three curves being painted among Figure 11 represent scan drive circuit in three kinds of liquid crystal reaction time that diverse location scanned and the relation curve between the penetrance respectively, wherein the 1st curve represented controlling grid scan line G001, article 2, curve is represented controlling grid scan line G080, and the 3rd curve represented controlling grid scan line G160.From this 11 figure, can find out, though between controlling grid scan line G001 and the G160 because of sweep time and liquid crystal reaction time existing institute difference, add after the while black plug, each bar sweep trace proceeds to also each difference to some extent of time sequencing that next subframe scans once again respectively from black plug (BDI) period, but because of the light transmittance of panel lowermost distal end region (as controlling grid scan line G160) be subjected to shut-in time o'clock that aforementioned delay control unit backlight postpones backlight to one time delay backlight T influence, so can wait for the reaction time of its liquid crystal finishes, and then promote its light transmittance, make more homogenising of panel luminance.
See also Figure 12, Figure 12 is the detection synoptic diagram of the backlight opening time selected element of color sequential display device of the present invention shown in Figure 10.Wherein transverse axis is represented the Backlight For Liquid Crystal Display Panels starting point time, and left vertical is represented briliancy (brightness), and its unit is nit (nit), and definition is the shading value of unit area on specific direction.Right vertical is represented luminance difference, and its unit is a number percent, and its value numerical value is low more good more.Display time interval as each subframe of a color sequential display device is approximately 5.56ms, and the unlatching period of deduction backlight is about 2ms, and its liquid crystal needs react before backlight is opened and finishes.One briliancy curve 1202 is (this time is defined as controlling grid scan line G001 action back 3.7ms, backlight lighting) when 3.7ms, and reaction backlight can reach a preferable panel luminance point 1203; And when 3.9ms, the liquid crystal reaction is finished, and makes a luminance difference curve 1201 obtain a lower luminance difference dissimilarity (that is this panel has preferable brightness uniformity).
By the foregoing description as can be known, the shut-in time of LCD utilization delay backlight of the present invention can be improved panel penetrance and brightness uniformity, and after the even raising of this brightness, gamma curve also makes moderate progress.
Please refer to Figure 13, Figure 13 is the synoptic diagram of color sequential display device second embodiment of the present invention.With first embodiment in comparison, each gated sweep of second embodiment adopts black plug in regular turn.Similarly, second embodiment also can utilize delay control unit backlight to control the shut-in time of backlight o'clock in the first selected element A1, promptly first time zone of the first subframe time begins between the end of extent in second o'clock, or the second selected element B2, or the 3rd selected element C3, between the i.e. first subframe time scan finishes to the second subframe time scan afterwards, with the problem of the not enough brightness irregularities that is produced of compensation liquid crystal reaction velocity.
See also Figure 14, Figure 14 is the liquid crystal reaction time figure of color sequential display device second embodiment of the present invention.S160 represents the 160th sweep trace scan start point of grid.Because of second embodiment adopts black plug in regular turn, so the liquid crystal reaction time length next not as first embodiment.But owing to the black plug time of each bar sweep trace is consistent, so its penetrance is not so good as the obvious of first embodiment in panel upper and lower side difference.Similarly,, postpone the shut-in time backlight, compensate its penetrance and descend, make more homogenising of panel luminance at T time delay backlight.
Please refer to Figure 15, Figure 15 is the detection synoptic diagram of each backlight opening time selected element of color sequential display device second embodiment of the present invention.The transverse axis of coordinate represents the Backlight For Liquid Crystal Display Panels starting point time (after this time is defined as controlling grid scan line G001 action back predetermined point of time among Figure 15, backlight lighting), left vertical is represented briliancy (brightness), its unit is nit (nit), and definition is the shading value of unit area on specific direction.Right vertical is represented luminance difference, and its unit is a number percent, and its value numerical value is low more good more.Compare with first embodiment of Figure 12, the brightness uniformity of second embodiment (seeing the luminance errors point 1504 of a luminance difference curve 1501) is better than first embodiment.
Figure 16 is a kind of foundation control method of the present invention, be applicable to the time backlight that postpones control one color sequential display device, wherein this color sequential display device as shown in Figures 7 and 8, have that a liquid crystal panel is used for producing each frame image and each frame is divided into a plurality of subframes (comprising as one first subframe and one second subframe) and aforementioned each subframe is divided into one first time zone and one second time zone according to sequential, one backlight is in order to produce light source, one backlight control circuit is in order to control the opening and closing time of this backlight, and one delay control unit backlight in order to postpone the shut-in time of this backlight, the flow process of this control method may further comprise the steps:
Step S162: this backlight control circuit is opened this backlight in a time point (as in first time zone) of one first subframe, is incident upon this liquid crystal panel to produce light;
Step S164: according to a default period, the shut-in time point of this backlight of decision between the first time zone end of scan of second o'clock end of extent to the second subframe of first subframe.For the shut-in time point of guaranteeing this backlight drops on second subframe, can utilize various steps to reach, do not limit the use of in particular step.For example, the time point at the beginning in first time zone of each subframe is added meter one preset period of time, wherein this preset period of time is the display time interval (as greater than more than the 5.56ms) greater than each subframe, perhaps the concluding time point with second time zone of each subframe adds meter one preset period of time, wherein this preset period of time is first time zone less than each subframe, or this preset period of time is a unlatching period of presetting of this backlight, therefore from the opening time point timing of this backlight to this preset period of time, can guarantee that the shut-in time point of this backlight drops on second subframe.The data of this preset period of time can prestore earlier and read for this delay control unit backlight in the memory storage unit; And
Step S166: this delay control unit backlight is according to the shut-in time point of this backlight, control this backlight control circuit and postpone output one backlight drive signal, so that the shut-in time of this backlight puts between the first time zone end of scan of second o'clock end of extent to the second subframe that is delayed to this first subframe to this backlight.
Though the present invention as above describes with preferred embodiment; right its is not in order to limit the present invention; anyly be familiar with those of ordinary skill in the art; without departing from the spirit and scope of the present invention; when can doing a little change and improvement, so protection scope of the present invention limits and is as the criterion when looking the accompanying Claim book.
Claims (21)
1. a color sequential display device is characterized in that, comprises:
One liquid crystal panel has a plurality of pixels to produce each frame image, and wherein this each frame is divided into a plurality of subframes:
One backlight is used for producing light and incides this liquid crystal panel;
One drive circuit, electrically connect an one scan line and a data line at least, and produce one first voltage and one second voltage to switch the keying of pixel, and make aforementioned each subframe be divided into one first time zone and one second time zone according to sequential, wherein this first voltage drives in first time zone, and this second voltage drives in second time zone;
One backlight control circuit is used for controlling opening time of aforementioned backlight; And
One delay control unit backlight is used for controlling the shut-in time point of this backlight, and the shut-in time of this backlight o'clock is finished between the first time zone end of scan of second subframe in first subframe.
2. color sequential display device according to claim 1 is characterized in that, this backlight control circuit is controlled this backlight corresponding light sources of different colors of switching in each subframe.
3. color sequential display device according to claim 1 is characterized in that, this liquid crystal panel comprises a pixel electrode and a common electrode in addition to control this pixel.
4. color sequential display device according to claim 1 is characterized in that this driving circuit has scan driving circuit, and wherein, this scan drive circuit is exported the film crystal tube grid of a signal to this liquid crystal panel via sweep trace.
5. color sequential display device according to claim 4 is characterized in that, this second voltage produces to drive liquid crystal in regular turn according to the signal of each sweep trace output.
6. color sequential display device according to claim 4 is characterized in that, this second voltage produces to drive liquid crystal simultaneously according to the signal of each sweep trace output.
7. color sequential display device according to claim 4 is characterized in that this driving circuit further has a data drive circuit, and wherein this data drive circuit is connected with the source electrode of this thin film transistor (TFT) by this data line.
8. color sequential display device according to claim 3 is characterized in that, this driving circuit has a storage capacitors and is electrically coupled to this pixel electrode and common electrode.
9. color sequential display device according to claim 8 is characterized in that, this second voltage is become by the pressure reduction institute modulation of this common electrode.
10. color sequential display device according to claim 8 is characterized in that this common electrode is divided into a plurality of zones, makes this second voltage carry out the subregion modulation with the pressure reduction of this common electrode and forms.
11. color sequential display device according to claim 1 is characterized in that, this delay control unit backlight is that hardware circuit or software constitute.
12. color sequential display device according to claim 1 is characterized in that, this delay control unit backlight is controlled the late release time of backlight according to the demonstration time of each subframe.
13. color sequential display device according to claim 1 is characterized in that, the period that this delay control unit backlight is opened according to this backlight, the late release time of control backlight.
14. color sequential display device according to claim 1 is characterized in that, the polarity of this first voltage and second voltage is reverse each other.
15. color sequential display device according to claim 1 is characterized in that, the polarity of this first voltage and second voltage is in the same way.
16. control method, be used to postpone to control the time backlight of a color sequential display device, it is characterized in that, at least two shown frames of this color sequential display device are divided into one first subframe and one second subframe and aforementioned each subframe at least and are divided into one first time zone and one second time zone according to sequential, and this method comprises the following step:
Time point in first subframe is opened a backlight;
According to a preset period of time, finish to the shut-in time point of this backlight of decision between the first time zone end of scan of second subframe in first subframe; And
According to the shut-in time point of this backlight, postpone output one backlight drive signal to this backlight.
17. control method according to claim 16, it is characterized in that, further comprise: the time point at the beginning in first time zone of each subframe is added the shut-in time point of this preset period of time of meter with the decision backlight, and wherein this preset period of time is greater than the display time interval of each subframe.
18. control method according to claim 16 is characterized in that, further comprises: each subframe concluding time point is added the shut-in time point of this preset period of time of meter with the decision backlight, it is characterized in that this preset period of time is less than first time zone of each subframe.
19. control method according to claim 16 is characterized in that, this preset period of time is a unlatching period of presetting of this backlight.
20. control method according to claim 16 is characterized in that, further comprises:, utilize a backlight delay control unit to control a backlight control circuit and postpone this backlight drive signal of output to backlight according to this preset period of time.
21. control method according to claim 20 is characterized in that, this delay control unit backlight is that a hardware circuit or software constitute.
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| CN101425265B (en) * | 2007-11-02 | 2011-01-26 | 上海中航光电子有限公司 | Field sequence lcd device |
| CN101980332A (en) * | 2010-10-21 | 2011-02-23 | 周建军 | Method for driving field sequential liquid crystal display device |
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