CN101196633B - Field sequentially driven liquid crystal display device - Google Patents
Field sequentially driven liquid crystal display device Download PDFInfo
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- CN101196633B CN101196633B CN2007103051414A CN200710305141A CN101196633B CN 101196633 B CN101196633 B CN 101196633B CN 2007103051414 A CN2007103051414 A CN 2007103051414A CN 200710305141 A CN200710305141 A CN 200710305141A CN 101196633 B CN101196633 B CN 101196633B
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Abstract
A liquid crystal display device with improved visual recognition is provided which includes: a first liquid crystal cell; a second liquid crystal cell; two cross polarizers disposed on both sides of a two-layer structure panel including the first and second liquid-crystal cells along a normal direction of the substrates; a light source capable of emitting lights of a plurality of colors; and a control circuit for time sequentially dividing one frame into a plurality of subframes, emitting light of a predetermined color in each subframe, synchronously with light emission, controlling a state of light transmission and light shielding of a plurality of display areas of said two-layer structure panel including said first and second liquid crystal cells, wherein the first and second liquid crystal cells are structured in a mutual optical compensation relation in both a driving state and a non-driving state.
Description
The cross reference of related application
The application based on and require the right of priority of Japanese patent application No.2007-087912 of Japanese patent application No.2007-066255 and the application on March 29th, 2007 of the Japanese patent application No.2006-274730 of on October 6th, 2006 application, application on March 15th, 2007, its full content is quoted and is incorporated into this.
Background technology
A) technical field
The present invention relates to liquid crystal indicator, more specifically relate to field sequence driving liquid crystal device with double-layer liquid crystal unit.
B) description of Related Art
Usually, in liquid crystal indicator, show white character and numeral are called negative the demonstration on black background, show on white background that black character and numeral just are called to show.
Field sequence (FS) driving method is known to be to drive in black background to show except the color liquid crystal display arrangement of the color of white and on white background, show the method except the color liquid crystal display arrangement of the color of black.
According to the FS driving method; Preparation can be launched the light source of plurality of color glory; And with the light source luminescent sequential synchronously conducting with break off liquid crystal indicator in; It is luminous that order repeats color, thereby utilize time integration (integration) ability of human eye on display pixel, to show various coloramas.
Color liquid crystal display arrangement with the FS driving method drives is well-known.
JP-A-2004-29154 (its full content is quoted and is incorporated into this) discloses a kind of anti ferroelectric liquid crystal FS that utilizes and has driven the negative color liquid crystal display arrangement that shows liquid crystal cells.
JP-A-2004-294824 (its full content is quoted and is incorporated into this) discloses a kind of negative demonstration FS liquid crystal indicator that utilizes two twisted-nematic (TN) liquid crystal cells.
JP-A-2002-303846 (its full content is quoted and is incorporated into this) discloses a kind of just demonstration FS liquid crystal indicator that utilizes even orientation liquid crystal cells.
Summary of the invention
The purpose of this invention is to provide a kind of FS liquid crystal indicator with improved visual identity.
According to an aspect of the present invention; A kind of liquid crystal indicator is provided; Comprise: first liquid crystal cells; Comprise first pair of opposing substrates and remain on first liquid crystal layer between this first pair of substrate that this first pair of substrate has first pair of pixel electrode that is used to show book character and numeral at least, and the orientation state of first liquid crystal layer can be controlled through the voltage that adjustment is applied between this first pair of pixel electrode; Second liquid crystal cells; Comprise second pair of opposing substrates and remain on second liquid crystal layer between this second pair of substrate; This second pair of substrate has second pair of pixel electrode on the zone that is used for covering fully book character and numeral, and the orientation state of second liquid crystal layer can be controlled through the voltage that adjustment is applied between this second pair of pixel electrode; Two crossed polarizerses are arranged on the both sides of the double-decker panel that comprises this first and second liquid crystal cells along the normal direction of this substrate; Light source can be launched the plurality of color glory; And control circuit; Time sequencing a frame is divided into a plurality of subframes; The light of emission pre-color in each subframe; With light emission synchronously, control comprises transmittance and the state that light covers of a plurality of viewing areas of the said double-decker panel of first and second liquid crystal cells, wherein this first and second liquid crystal cells is formed in driving condition and the non-driven state relation of optical compensation mutually.
According to a further aspect in the invention; A kind of driving method of liquid crystal indicator is provided; This liquid crystal indicator comprises: first liquid crystal cells; Comprise first pair of opposing substrates and remain on first liquid crystal layer between this first pair of substrate that this first pair of substrate has first pair of pixel electrode that is used to show book character and numeral at least, and the orientation state of first liquid crystal layer can be controlled through the voltage that adjustment is applied between this first pair of pixel electrode; Second liquid crystal cells; Comprise second pair of opposing substrates and remain on second liquid crystal layer between this second pair of substrate; This second pair of substrate has second pair of pixel electrode on the zone that is used for covering fully this book character and numeral, and the orientation state of second liquid crystal layer can be controlled through the voltage that adjustment is applied between this second pair of pixel electrode; Two crossed polarizerses are arranged on the both sides of the double-decker panel that comprises this first and second liquid crystal cells along the normal direction of this substrate; Light source can be launched the plurality of color glory; And control circuit; Time sequencing a frame is divided into a plurality of subframes; The light of emission pre-color in each subframe, with light emission synchronously, control comprises transmittance and the state that light covers of a plurality of viewing areas of this double-decker panel of first and second liquid crystal cells; Wherein, this driving method is controlled by this way: make the viewing area that in a subframe, gets into the light shielding status get into another subframe.
According to an embodiment more of the present invention; A kind of driving method of liquid crystal indicator is provided; This liquid crystal indicator comprises: first liquid crystal cells; Comprise first pair of opposing substrates and remain on first liquid crystal layer between this first pair of substrate that this first pair of substrate has first pair of pixel electrode that is used to show book character and numeral at least, and the orientation state of first liquid crystal layer can be controlled through the voltage that adjustment is applied between this first pair of pixel electrode; Second liquid crystal cells; Comprise second pair of opposing substrates and remain on second liquid crystal layer between this second pair of substrate; This second pair of substrate has second pair of pixel electrode on the zone that is used for covering fully this book character and numeral, and the orientation state of second liquid crystal layer can be controlled through the voltage that adjustment is applied between this second pair of pixel electrode; Two crossed polarizerses are arranged on the both sides of the double-decker panel that comprises this first and second liquid crystal cells along the normal direction of this substrate; Light source can be launched the plurality of color glory; And control circuit; Time sequencing a frame is divided into a plurality of subframes; The light of emission pre-color in each subframe; Launch synchronously with light; Control comprises transmittance and the state that light covers of a plurality of viewing areas of this double-decker panel of first and second liquid crystal cells, and wherein, this driving method is controlled by this way: the orientation state through controlling the liquid crystal of at least one liquid crystal cells in this first and second liquid crystal cells is implemented the grade demonstration with the intermediateness that has between driving condition and non-driven state.
According to FS liquid crystal indicator of the present invention, can improve visual identity.
Description of drawings
Fig. 1 is the schematic sectional view with double-deck LCD unit.
Fig. 2 is the diagram of frictional direction of transmission axle direction and liquid crystal cells of the polaroid of expression LCD unit.
Fig. 3 is a schematic block diagram of being furnished with the FS liquid crystal indicator of LCD unit.
Fig. 4 A is the diagram that expression is installed in the transparency electrode on the back liquid crystal cells of LCD unit, and Fig. 4 B is the diagram that expression is installed in the transparency electrode on the preceding liquid crystal cells of LCD unit.
Fig. 5 A is the explanatory diagram as the transparency electrode of the back liquid crystal cells of segmentation show electrode, and Fig. 5 B is the explanatory diagram as the transparency electrode of the preceding liquid crystal cells of background electrode.
Fig. 6 is the explanatory diagram of the colored show state of expression.
Fig. 7 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 1-1.
Fig. 8 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 1-2.
Fig. 9 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 1-3.
Figure 10 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 1-4.
Figure 11 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 1-5.
Figure 12 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 1-5.
Figure 13 A and 13B are the diagrams of example of the electrode pattern of the brilliant unit of expression biliquid.
Figure 14 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 2-1.
Figure 15 is the explanatory diagram of the colored show state of expression.
Figure 16 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 2-2.
Figure 17 is the explanatory diagram of the colored show state of expression.
Figure 18 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 2-3.
Figure 19 is the explanatory diagram of the colored show state of expression.
Figure 20 A and 20B are the diagrams of example of the electrode pattern of the brilliant unit of expression biliquid.
Figure 21 is the diagram that the explanation gray scale shows.
Figure 22 representes the demonstration example according to embodiment 3-1.
Figure 23 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 3-1.
Figure 24 representes the demonstration example according to embodiment 3-2.
Figure 25 is the table of explanation according to the driving method of the liquid crystal indicator of embodiment 3-2.
Figure 26 A and 26B represent to adopt the example of the projection type image display apparatus of embodiment.
Figure 27 is the diagram of frictional direction of transmission axle direction and liquid crystal cells of the polaroid of the expression double-deck LCD unit that utilizes the vertical orientation liquid crystal cells.
Embodiment
Will be with reference to the description of drawings embodiments of the invention.
Fig. 1 is the schematic section of example that expression is assemblied in the structure of the liquid crystal display in the liquid crystal indicator.
Liquid crystal indicator is made up of preceding liquid crystal display 1b, back liquid crystal display 1a, preceding polaroid (polarizer) 2b and rear polarizer 2a.
Sept is arranged between preceding liquid crystal cells 1b and the back liquid crystal cells 1a so that they are linked together.Liquid crystal cells 1b before preceding polaroid 2b adheres to, and rear polarizer 2a adheres to liquid crystal cells 1a before the back.We claim that the double T N liquid crystal cells that links together is double-decker panel SP.
As shown in, preceding liquid crystal cells 1b is clipped in the middle liquid crystal 6b through a pair of transparency carrier 3b1 that is formed with transparency electrode 5b1 and 5b2 above that and 3b2 (like, glass substrate).
Transparency electrode 5b1 and 5b2 have alignment film 7b1 and 7b2 on the apparent surface of electrode.
Seal 4b uses the outer peripheral areas of bonding transparency carrier 3b1 of bonding agent and 3b2, thus liquid crystal 6b is sealed in the space between transparency carrier 3b1 and the 3b2.
Similar with preceding liquid crystal cells 1b; Back liquid crystal cells 1a by a pair of transparency carrier 3a1 and 3a2 (as; Glass substrate), be formed on transparency electrode 5a1 and the 5a2 on transparency carrier 3a1 and the 3a2 and the alignment film 7a1 and the 7a2 that are formed on the apparent surface of transparency electrode 5a1 and 5a2 form, wherein this transparency carrier 3a1 and 3a2 use the band bonding agent to bond together through seal 4a and liquid crystal 6a are sealed between them.
Fig. 2 is the figure of frictional direction of transmission axle direction and liquid crystal cells of the polaroid of expression liquid crystal display.
That is to say, the preceding alignment film 7b2 of liquid crystal cells 1b before frictional direction 9b2 is used for representing, and frictional direction 9b1 is used for representing the back alignment film 7b1 of preceding liquid crystal cells 1b.Frictional direction 9a2 among Fig. 2 is used for representing the preceding alignment film 7a2 of back liquid crystal cells 1a, and the frictional direction 9a1 among Fig. 2 is used for representing the back alignment film 7a1 of back liquid crystal cells 1a.
Preceding liquid crystal cells 1b forms TN type liquid crystal cells.Alignment film 7b1 and 7b2 are by NissanChemical Industries, and the horizontal direction matching film SE410 that Ltd produces processes.Pre-tilt angle obtains along this alignment film of direction friction of Fig. 2 through using the friction cloth processed by regenerated fiber (rayon).
Transparency carrier 3b1 and 3b2 pile up and are bonded together with bonding agent, have the clearance control part that the diameter that is inserted in therebetween is 5 μ m.The liquid crystal 6b that is sealed in the space between transparency carrier 3b1 and the 3b2 is that 0.95 liquid crystal material causes by having positive dielectric constant anisotropy (liquid crystal molecule when being applied in voltage from horizontal twisting orientation rise) and birefringence n; This liquid crystal material is produced by Merck Ltd, has added the chiral material that is used for confirming direction of twist.
Except for preceding liquid crystal cells 1b, chiral material is used for setting clockwise direction of twist, and for back liquid crystal cells 1a, chiral material is used for setting outside the counterclockwise direction of twist, and back liquid crystal cells 1a and preceding liquid crystal cells 1b have similar structure.
Because preceding liquid crystal cells 1b and back liquid crystal cells 1a have opposite direction of twist; And the frictional direction 9b1 of the back alignment film 7b1 of preceding liquid crystal cells 1b is perpendicular to the frictional direction 9a2 of the preceding alignment film 7a1 of back liquid crystal cells 1a; Before liquid crystal cells 1b have the relation of mutual optical compensation with back liquid crystal cells 1a, as shown in Figure 2.
Fig. 3 is the block scheme of the FS liquid crystal indicator of expression embodiment.In Fig. 3, polaroid 2b and 2a before and after not illustrating.
As shown in Figure 3, the LS backlight of sequential firing redness (R), green (G) and blueness (B) is set on the rear side of back liquid crystal cells 1a.
LS backlight is synchronoused working with the driver 10a of two liquid crystal cells 1b and 1a under the control of isochronous controller 20 with driver 10b.
LS backlight can be the known light source that is made up of light-emitting diodes (LED), cold-cathode fluorescence lamp (CCFL) etc.Except using double-deck liquid crystal cells, the FS driving method can be the method for describing among JP-A-2004-29154, JP-A-2004-294824 and the JP-A-2002-303846.Similar with the liquid crystal indicator described in these disclosed applications; A frame period is divided into a plurality of subframes in chronological order; It is luminous in each subframe to drive LS backlight, and synchronously luminous with this, and the electrode of liquid crystal cells 1b and back liquid crystal cells 1a is with conducting and disconnection before driving.
Preceding liquid crystal cells 1b and back liquid crystal cells 1a have the transparency electrode shown in Fig. 4 A and 4B.
That is, the transparency electrode 5a1 of back liquid crystal cells 1a and 5a2 are the segmentation electrodes shown in Fig. 4 A.
More specifically, transparency electrode 5a1 and 5a2 are the common display electrodes that is used for character display and numeral.
Transparency electrode 5b1 and 5b2 are the background show electrodes shown in Fig. 4 B.
More specifically, the transparency electrode 5b1 of preceding liquid crystal cells 1b and 5b2 are used for showing, so-called stereo display, the background show electrode of the whole effective viewing area in the seal 4b.
On the liquid crystal cells 1b, the background show electrode can be formed on the liquid crystal cells 1a of back before the segmentation electrode can be formed on.
The colour demonstration example of liquid crystal indicator then, is described.
Simple in order to describe, transparency electrode 5b1 and the 5b2 of liquid crystal cells 1b are the background show electrodes before supposing, and transparency electrode 5a1 and the 5a2 of back liquid crystal cells 1a are seven segmentation electrodes.Electrode in the seven segmentation electrodes is enclosed the alphabetical a1 to h1 shown in Fig. 5 A and 5B.
If do not consider intermediate luminance, the LS backlight that then is used to launch the light of three kinds of color R, G and B can launch eight kinds of color light that comprise white and black.Therefore, distribute seven kinds of color light to seven segmentation electrode a1 to g1 and distribute the demonstration example of a kind of colorama explanation to background show electrode h1.
In the demonstration of reality, comprise that not only the numeral of " 8 " shows with seven kinds of colors, and various coloured image is also used a plurality of sections demonstrations.
Embodiment 1-1
In the first configurations shown example, on black back of the body screen, implement colored the demonstration, this is the typical negative example that shows.In Fig. 6, background show electrode h1 is used as black display, and segmentation electrode a1 is used as white and shows; Segmentation electrode b1 is used as yellow the demonstration; Segmentation electrode c1 is used as reddish violet and shows that segmentation electrode d1 is used as red display, and segmentation electrode e1 is used as cyan and shows; Segmentation electrode f1 is used as green the demonstration, and segmentation electrode g1 is used as blue the demonstration.
In this configurations shown example, in R, G and the B lumination of light emitting diode sequential of LS backlight, implement the color demonstration with breaking off through the conducting that drives segmentation electrode and background electrode, as shown in Figure 7.
The characteristics of the first configurations shown example are: even in each R, G and B lumination of light emitting diode sequential; Through background show electrode h1 is set is that off-state makes background keep black; And synchronously drive the conducting and the disconnection of each segmentation electrode with each lumination of light emitting diode sequential, thereby implement the demonstration of seven kinds of colors.
The conducting state of each electrode is the state that the effective voltage that white shows is applied to the liquid crystal of brilliant unit 1b of biliquid and 1a, and each liquid crystal cells 1b and 1a are as the general TN cell operation that has the parallel-nicol polaroid in its both sides.The off-state of each electrode is the state that in the situation of static drive, does not apply voltage and in the situation of multiple driving, the effective voltage of black display is applied to the liquid crystal of brilliant unit 1b of biliquid and 1a, and each liquid crystal cells 1b and 1a conduct have the general TN cell operation of parallel-nicol polaroid in its both sides.
Embodiment 1-2
In the second configurations shown example, on white background, implement color and show that this is the example that is typically just showing.In Fig. 6, background show electrode h1 is used as white and shows that segmentation electrode a1 is used as black display; Segmentation electrode b1 is used as blue the demonstration; Segmentation electrode c1 is used as green the demonstration, and segmentation electrode d1 is used as cyan and shows that segmentation electrode e1 is used as red display; Segmentation electrode f1 is used as aubergine and shows, and segmentation electrode g1 is used as yellow the demonstration.
In this configurations shown example, in R, G and the B lumination of light emitting diode sequential of LS backlight, implement the color demonstration with breaking off through the conducting that drives segmentation electrode and background electrode, as shown in Figure 8.
The characteristics of the second configurations shown example are: even in each R, G and B lumination of light emitting diode sequential; Through background show electrode h1 is set is that conducting state makes background keep white; And synchronously drive the conducting and the disconnection of segmentation electrode with each lumination of light emitting diode sequential, thereby implement the demonstration of seven kinds of colors.The conducting of each electrode is identical with the first configurations shown example with the definition of off-state.
Often think because segmentation electrode a1～g1 receives the influence of the background show electrode in the conducting state and can not realize that color shows.Yet, if in the conducting of driving background show electrode, drive the segmentation electrode conduction, because the mutual optical compensation of brilliant unit 1b of biliquid and 1a former thereby can realize black display.
For example, with respect to background show electrode h1,, drive segmentation electrode a1 conducting in each R, G and B lumination of light emitting diode sequential.
Similarly; If the segmentation electrode be in background show electrode h1 at the identical state of luminous sequential; Be conducting state, then cover the emission light of other each segmentation electrode, and if the segmentation electrode be in background show electrode h1 in luminous sequential different state; Be off-state, the emission light of other each segmentation electrode of transmission then.So be implemented in the demonstration of seven kinds of colours on the white background.
Embodiment 1-3
In the 3rd configurations shown example, backcolor is to be different from the white and the color of black, and is one of among R, G and the B of LS backlight.
For example, suppose be provided with LS backlight and the luminous conducting and disconnection sequential of electrode a1～h1 as shown in Figure 9, the background show electrode h1 among Fig. 6 is used as blue the demonstration; Segmentation electrode a1 is used as yellow the demonstration, and segmentation electrode b1 is used as white and shows that segmentation electrode c1 is used as red display; Segmentation electrode d1 is used as aubergine and shows; Segmentation electrode e1 is used as green the demonstration, and segmentation electrode f1 is used as cyan and shows, and segmentation electrode g1 is used as black display.
Embodiment 1-4
In the 4th configurations shown example, backcolor is the color mixture of two kinds of colors among R, G and the B.
For example, suppose the luminous conducting and disconnection sequential that LS backlight and electrode a1～h1 are set shown in figure 10, the background show electrode h1 among Fig. 6 is used as aubergine and shows; Segmentation electrode a1 is used as red display, and segmentation electrode b1 is used as aubergine and shows, segmentation electrode c1 is used as yellow the demonstration; Segmentation electrode d1 is used as white and shows; Segmentation electrode e1 is used as black display, and segmentation electrode f1 is used as blue the demonstration, and segmentation electrode g1 is used as green the demonstration.
Embodiment 1-5
In the 5th configurations shown example, do not change at the segmentation electrode under the situation of display color, backcolor can change.
For example, suppose be provided with LS backlight and the luminous conducting and disconnection sequential of electrode a1～h1 shown in figure 11, the background show electrode h1 among Fig. 6 is used as white and shows that all segmentation electrode a1～g1 are used as red display, that is, segmentation shows it is red digital " 9 ".Suppose shown in figure 12 be provided with backlight 31 with the luminous conducting of electrode a1～h1 with break off sequential, do not changing under the situation that red segmentation shows, background can change to blueness.
Like Figure 11 and shown in Figure 12, segmentation electrode a1～g1 and background show electrode h1 only the sequential working when the color lumination of light emitting diode that will show the time so that different show states to be provided.
The inventor has created a kind of LCD, through changing the FS type of drive so-called color sudden change (colorbreak) phenomenon does not take place in this display.
Figure 13 representes the example of the electrode pattern of the brilliant unit of biliquid among the embodiment 2.Liquid crystal cells 1a and 1b have and are used for the transparency electrode that shows according to the voltage that is applied to liquid crystal layer.A unit (being called display unit) has the segmentation electrode, and the electrode a2～d2 shown in figure 13 and another unit (being called the background display unit) that for example are used for the segmentation demonstration have the rigid electrode e2 that is used to show whole effective viewing area.Perhaps display unit or background display unit can be arranged on top (at rear side).
With describing the embodiment that a frame of driving voltage is divided into three sub-frame.
Embodiment 2-1
Figure 14 illustrates the table of the driving method of the liquid crystal indicator that first embodiment is described.In embodiment 2-1, realize that on black background the color segmentation shows, this is typical negative the demonstration.Conducting/disconnection (ON/OFF) state of expressing each R, G and B light emitting diode in each subframe among Figure 14; Segmentation electrode a2～d2 on the display unit and conducting/off-state of the rigid electrode e2 on the background display unit, and the every kind of color that in the viewing area that limits at each electrode, shows.Rigid electrode e2 almost covers whole viewing area greater than segmentation electrode a2～d2 and formation, makes segmentation electrode a2～d2 overlap on the viewing area.The display color of electrode e2 is the color of background display color rather than segmentation electrode.
The conducting state of light emitting diode is corresponding to luminance, and off-state is corresponding to luminance not.The definition of conducting state and off-state and embodiment 1 are similar.
Figure 15 illustrates the example of actual displayed.In embodiment 2-1, rigid electrode e2 is set to off-state to realize the black display (it is last not to be superimposed upon segmentation electrode a2～d2) of background in all subframes.Conducting or the off-state of segmentation electrode a2～d2 are set according to each subframe.Be superimposed upon each last viewing area of segmentation electrode a2～d2 of display unit at the rigid electrode e2 of background display unit; If be conducting one of in the unit; Then liquid crystal display gets into the transmittance state; And if two unit all are conductings or break off, then liquid crystal display gets into the light shielding status.
In each subframe, the light of its display color of light emitting diode emission.Can launch the plurality of color glory through adjustment conducting/disconnection and R, G and B luminous intensity.In table shown in Figure 14, conducting/disconnections of control voltage shows that thereby electrode a is used as white (W) electrode b is used as redness (R) and shows, electrode c is used as yellow (Y) and shows, and electrode d is used as black (BK) demonstration, and be shown in figure 15.
Embodiment 2-2
Figure 16 illustrates the table of the driving method of the liquid crystal indicator that second embodiment is described.In embodiment 2-2, realize that on white background the color segmentation shows that this is typically just to show.The definition of the conducting/disconnection of light-emitting diodes and the conducting/disconnection of each electrode is similar with embodiment 2-1.
Figure 17 illustrates the example of actual displayed.In a second embodiment, in the subframe when the backlight emission white light, rigid electrode e2 is arranged to conducting state shows with the white that realizes background.Control method to the transmittance/light of liquid crystal display covers is similar with embodiment 2-1.
If rigid electrode (e2) is in conducting state, then should consider to receive the influence of electrode (e2) demonstration, be superimposed upon the last viewing area of arbitrary segmentation electrode a2～d2 at rigid electrode e2, the color jumping phenomenon that segmentation shows might take place.The inventor has been found that: in the subframe when electrode e is set to conducting state; Be set to conducting state is different from white with demonstration color light through the electrode among segmentation electrode a～d; Cover emission light backlight in the overlay electrode zone, then can prevent the color jumping phenomenon.As, because electrode a2 has the conducting/off-state with electrode e equal state in all subframes, to realize black display (light shielding status).
If the another kind of color of desired display, then in the subframe by this color light of backlight emission the time, driving voltage is set to be different from the state (first conducting state, another is an off-state) of electrode e2.
In table shown in Figure 16, conducting/disconnections of control voltage shows that thereby electrode a2 is used as black (BK) electrode b2 is used as redness (R) and shows, electrode c2 is used as yellow (Y) and shows, and electrode d2 is used as white (W) demonstration, and be shown in figure 17.Similar with first embodiment, through the conducting/disconnection and the luminous intensity of adjustment R, G and B light emitting diode, can launch the plurality of color glory that is different from the color shown in the table.
Embodiment 2-3
Figure 19 illustrates the table of explanation according to the driving method of the liquid crystal indicator of the 3rd embodiment.In embodiment 2-3, realize that on desired color background colored segmentation shows.Definition to the conducting/disconnection of the conducting/disconnection of light emitting diode and each electrode is similar with the definition among the embodiment 2-1.
Figure 19 representes the example of actual displayed.In Figure 19, the blue demonstration is used as backcolor.In the subframe when the backlight emission blue light, electrode e is set to conducting state.The control method of the transmittance of liquid crystal display/light shielding status is similar with embodiment 2-1.
Can prevent colored jumping phenomenon with the mode similar with embodiment 2-2.
In table shown in Figure 180, conducting/disconnections of control voltage shows that thereby electrode a2 is used as white (W) electrode b2 is used as redness (R) and shows, electrode c2 is used as black (BK) and shows, and electrode d2 is used as blueness (B) demonstration, and be shown in figure 19.Similar with first embodiment, through the conducting/disconnection and the luminous intensity of adjustment R, G and B light emitting diode, can launch the plurality of color glory that is different from the color shown in the table.
Like the above embodiments 2, in the electrode overlapping areas of the brilliant unit of the biliquid of liquid crystal indicator 101, even the driving voltage of two liquid crystal cells also can cover from light backlight not only all in off-state but also all in conducting state.Therefore can provide a kind of can prevent the color sudden change and show drift and the multicolour liquid crystal indicator of raising display quality.
Because through the display brightness of adjusting backlight; Can become maximum condition (all conductings/all disconnections) in response speed and confirm down so be applied to the voltage of liquid crystal cells, and an advantage is arranged: the gray scale that need not implement to reduce significantly liquid crystal response speed shows (gradation display).
The inventor has created and a kind ofly can realize that multicolour shows and the LCD of occurrence of color jumping phenomenon not.
Figure 20 A and 20B represent the example of the electrode pattern of the brilliant unit of biliquid.Liquid crystal cells 1a and 1b have and are used for the transparency electrode that shows according to the voltage that is applied to liquid crystal layer.A unit (being called display unit) has and is used for the segmentation electrode that segmentation shows, electrode a3～d3 and the e3-1～e3-7 shown in Fig. 3 A for example, and another unit (being called the background display unit) has the rigid electrode f that is used to show whole effective viewing area.Perhaps display unit or background display unit can be arranged on top (at rear side).
Figure 21 is the concept map that the explanation gray scale shows.Use a kind of example of simple control in this embodiment, wherein when the background display unit is arranged on driving condition or non-driven state, the voltage that control is applied to display unit shows with the gray scale that realizes the expectation tone.Show that if do not implement gray scale then be set to conducting (perhaps breaking off) state through background display unit 1b and display unit is set to break off (perhaps conducting) state, liquid crystal display gets into the transmittance state.In this embodiment, the voltage that is applied to display unit through adjustment is adjusted the optical transmission of back light unit, thereby realizes that gray scale shows.In example shown in Figure 21, in order to make a half transmitting of light backlight, the background display unit is set to conducting (or disconnection) state and display unit is set to conducting (or disconnection) state.In this embodiment, the voltage that shows of gray scale applies state and representes (the tone ratio that O/O is the gray scale demonstration) with the O/O conducting.Explanation is divided into a frame driving voltage embodiment of three sub-frame.
Embodiment 3-1
Figure 22 illustrates the demonstration example.In embodiment 3-1, realize that on white background segmentation shows.In embodiment 3-1, realize that on white background the color segmentation shows that this is typically just to show.Rigid electrode f3 is greater than the segmentation electrode, and formation almost covers whole viewing area.Segmentation electrode in the table shown in Figure 7 constitutes the viewing area.The display color of electrode f3 in the table is different from the color of the background viewing area of the viewing area that is limited at the segmentation electrode.For example, colouring intensity representes through line bonus numerical value before color names, for example, if blue intensities is half of conventional intensity then is expressed as 1/2 blueness.Being set in embodiment 3-1: a3-cyan, b3-aubergine (showing that intensity maybe be consistent with temperature), c3-cyan, d3-aubergine, e3-1-cyan, e3-2-2/3 cyan, e3-3-1/3 cyan, e3-4-black, e3-5-1/3 aubergine, e3-6-2/3 aubergine, e3-7-aubergine and f3-white.
Figure 23 illustrates the table of driving method of the liquid crystal indicator of illustrative embodiment 2.Conducting/off-state of expressing each R, G and B light emitting diode in each subframe shown in Figure 23; Conducting/off-state of rigid electrode f3 on segmentation electrode a3～d3 on the display unit and e3-1～e3-7 and the background display unit, and the every kind of color that in the viewing area that each electrode limited, is shown.The conducting state of light emitting diode is corresponding to luminance, and off-state is corresponding to non-luminance.The conducting state of each electrode is corresponding to driving condition, and off-state is corresponding to non-driven state.
Embodiment 3-1 uses the TN liquid crystal cells.All be in off-state if having the double T N liquid crystal cells of relative direction of twist, then the light distortion is all offset in two unit, thereby the liquid crystal display with crossed polarizers gets into the light shielding status.If Unit two all are in conducting state, the liquid crystal molecule vertical uplift in the unit, thus light does not pass liquid crystal cells with having any distortion, and have the liquid crystal display entering light shielding status of crossed polarizers.If be in conducting state one of in the unit, then light does not pass the unit of conducting state with having any distortion, and light twists 90 ° in the unit of off-state.Therefore liquid crystal display gets into the transmittance state.In this embodiment, though relative direction of twist is used for obtaining the characteristic of optimal viewing angle, hope also can use identical direction of twist.
In each subframe, light emitting diode is launched the light of corresponding color.Through adjusting the conducting/off-state and the luminous intensity of each R, G and B light emitting diode, can launch the light of multicolour.
In the subframe when the backlight emission white light time, all segmentation electrode and rigid electrode f are set to conducting state, realize that therefore the white of background shows (not being superimposed upon the zone on the segmentation electrode).According to each subframe, each segmentation electrode is confirmed as conducting or off-state.Be superimposed upon in the viewing area on each segmentation electrode of display unit at the rigid electrode f of background display unit, if be in conducting state one of in the unit, then liquid crystal display gets into the transmittance state.If two unit all are in conducting or off-state, then liquid crystal display gets into the light shielding status.If the colouring intensity (for example, if air-conditioner temperature is represented by colouring intensity) of electrode b3, e3-2, e3-3, e3-5, e3-6 etc. is set, the drive waveforms that then will have the effective voltage that can gray scale shows applies and strides across the segmentation electrode.The effective voltage of drive waveforms can be through adjusting forward voltage, controlling through the pulse control time or other method that drive the conducting waveform in proper order.
Find out from table shown in Figure 23; Liquid crystal indicator with the sudden change of controlled liquid crystal cells and achromatization backlight can be launched the light of cutting apart the multicolour of number more than subframe; And can eliminate because the demonstration problem such as color loss and variable color that parallax and ghost image cause, at the most in the time can not realizing the gray scale demonstration.
Embodiment 3-2
Figure 24 illustrates the demonstration example.In embodiment 3-2, realize that on black background the color segmentation shows that this is typically just to show.Identical among the definition of the conducting/off-state of light emitting diode and the conducting/off-state of each segmentation electrode and the embodiment 3-1.In embodiment 3-2, cut apart the color mixture method through time sequencing and can show the color number of Duoing than first embodiment.Yet, should be noted that and under the condition that allows the color jumping phenomenon, use this embodiment.
Figure 25 illustrates the table of the driving method of the liquid crystal indicator that second embodiment is described.As shown in Figure 9, being set among second embodiment: a3-is blue, b3-is red or blue (showing that intensity maybe be consistent with temperature), c3-is blue, d3-is red, e3-1-is blue, e3-2-cyan, e3-3-1/2 cyan, e3-4-black, e3-5-1/2 aubergine, e3-6-aubergine, e3-7-is red and f-is white.The number of the color that can show is greater than the number of embodiment 3-1.
Of preamble, all not only be in off-state but also be under the situation of off-state at the driving voltage of liquid crystal display, liquid crystal display 101 can cover from light backlight in the overlapping viewing area of electrode of the brilliant unit of biliquid.Therefore, can provide a kind of and can prevent to show that drift waits and improve the multicolour liquid crystal indicator of display quality.
Show can realize gray scale through the control liquid crystal cells, a kind of liquid crystal indicator that can show multicolour also can be provided.
Can adopt other display device of the present invention can be projection display device.Figure 26 A and 26B illustrate the example of projection display device.
The structure of the projection display device shown in Figure 26 A is: the light source LS, polarizer X1, double-decker panel SP, polarizer X2 and the screen SC that are provided for emitting parallel light along optical propagation direction with this order in succession.Polarizer X1 and X2 are with the setting that concerns of quadrature-Niccol.
The structure of the projection display device shown in Figure 26 B is: with this order for example light source LS, polarizer X1, double-decker panel SP, polarizer X2, fresnel prism FL and the screen SC of pointolite are set in succession along optical propagation direction.
Use this optical projection system with image projection on screen SC, the observer can see that a width of cloth projects on the screen and usually perpendicular to the light image of substrate, thereby does not have recognizable difference between the visual angle.
In conjunction with embodiment the present invention has been described.The invention is not restricted to this.For example; The liquid crystal cells of using double-decker panel SP is not limited to the TN liquid crystal cells; But as far as those of ordinary skills; All in the state of conducting and disconnection, cover the condition from light backlight as long as two liquid crystal cells satisfy, it is conspicuous that the present invention also can be applied to vertical orientation type unit, STN unit, ferroelectric liquid crystal cell etc.
Figure 27 illustrates and uses the example of vertical orientation liquid crystal cells as the frictional direction of the transmission axle of the polaroid of the display device of double-decker panel and liquid crystal cells.From a left side sequentially, four coordinate axis are corresponding to polarizer X1, vertical orientation liquid crystal display VCl, vertical orientation liquid crystal display VC2 and polarizer X2.As shown in, implement friction treatment, vertical thereby the direction that liquid crystal molecule falls down becomes when voltage puts on two vertical orientation liquid crystal cells.
If chiral material is added to liquid crystal cells so that liquid crystal molecule distortion when applying voltage and falling down, be provided with in the following manner: the liquid crystal layer of liquid crystal cells has identical chirality pitch and relative direction of twist.
Though the segmentation electrode is used for display unit, also can use the dot matrix type liquid crystal cells that a plurality of pixels (point) is set.
In addition, in an embodiment, rigid electrode f is used for whole effective viewing area of display background display unit.The background display unit can have a plurality of viewing areas.In this case, in a plurality of viewing areas of background display unit, exist liquid crystal molecule not have driven viewing area.In typical example, these zones appear as black display.This black display can realize through the mask printing.The mask printing can be used black mask, perhaps can use the color of the peripheral profile decorative colour of coupling display device.
The present invention has been described in conjunction with the preferred embodiments.The invention is not restricted to the foregoing description.To those of ordinary skills is conspicuous: can make other various modifications, improvement, combination etc.
Claims (17)
1. liquid crystal indicator comprises:
First liquid crystal cells; Comprise first pair of opposing substrates and remain on first liquid crystal layer between said first pair of substrate; Said first pair of substrate has the first pair of pixel electrode that is used to show book character and numeral at least, and the orientation state of said first liquid crystal layer can be controlled through the voltage that adjustment is applied on said first pair of pixel electrode;
Second liquid crystal cells; Comprise second pair of opposing substrates and remain on second liquid crystal layer between said second pair of substrate; Said second pair of substrate has the second pair of pixel electrode that is used for covering fully the said book character and the zone of numeral, and the orientation state of said second liquid crystal layer can be controlled through the voltage that adjustment is applied on said second pair of pixel electrode;
Two crossed polarizerses, the normal direction of the said substrate in edge is arranged on the both sides of the double-decker panel that comprises said first and second liquid crystal cells;
Light source can be launched the light of multicolour; And
Control circuit; Time sequencing a frame is divided into a plurality of subframes; The light of emission pre-color in each subframe, with light emission synchronously, control comprises transmittance and the state that light covers of a plurality of viewing areas of the said double-decker panel of said first and second liquid crystal cells; Thereby realize that color shows
Wherein, said first and second liquid crystal cells are formed in driving condition and the non-driven state relation of optical compensation mutually; When one of said first and second liquid crystal cells are in the ON state and another one when being in the OFF state, said liquid crystal indicator transmitted light.
2. liquid crystal indicator according to claim 1, wherein said control circuit is controlled by this way: the said a plurality of viewing areas that limited the electrode of the electrode of said first liquid crystal cells and said second liquid crystal cells are only in one of said subframe or in all said subframes, become the transmittance state.
3. liquid crystal indicator according to claim 2; If each said first and second liquid crystal cells that wherein define in said a plurality of viewing area all are in driving condition or non-driven state, each in the then said viewing area gets into light shielding status.
4. liquid crystal indicator according to claim 3, wherein said light source comprises light emitting diode.
5. liquid crystal indicator according to claim 3, wherein said light emitted directional light.
6. liquid crystal indicator according to claim 3, wherein said light source are the pointolites of emitted radiation light.
7. liquid crystal indicator according to claim 1, wherein the gray scale demonstration is implemented with the middle orientation state that has between driving condition and the non-driven state through the orientation state of controlling the liquid crystal of at least one in said first and second liquid crystal cells.
8. liquid crystal indicator according to claim 7, wherein said control circuit is controlled by this way: by said a plurality of viewing areas of the electrode definition of the electrode of said first liquid crystal cells and said second liquid crystal cells only in one of said subframe or in all said subframes, become the transmittance state.
9. liquid crystal indicator according to claim 8; If each said first and second liquid crystal cells that wherein define in said a plurality of viewing area all are in driving condition or non-driven state, each in the then said viewing area gets into light shielding status.
10. liquid crystal indicator according to claim 9, wherein said light source comprises light emitting diode.
11. liquid crystal indicator according to claim 9, wherein said light emitted directional light.
12. liquid crystal indicator according to claim 9, wherein said light source are the pointolites of emitted radiation light.
13. the driving method of a liquid crystal indicator, this liquid crystal indicator comprises:
First liquid crystal cells; Comprise first pair of opposing substrates and remain on first liquid crystal layer between said first pair of substrate; Said first pair of substrate has the first pair of pixel electrode that is used to show book character and numeral at least, and the orientation state of said first liquid crystal layer can be controlled through the voltage that adjustment is applied on said first pair of pixel electrode;
Second liquid crystal cells; Comprise second pair of opposing substrates and remain on second liquid crystal layer between said second pair of substrate; Said second pair of substrate has the second pair of pixel electrode that is used for covering fully the said book character and the zone of numeral, and the orientation state of said second liquid crystal layer can be controlled through the voltage that adjustment is applied on said second pair of pixel electrode;
Two crossed polarizerses, the normal direction of the said substrate in edge is arranged on the both sides of the double-decker panel that comprises said first and second liquid crystal cells;
Light source can be launched the light of multicolour; And
Control circuit is divided into a plurality of subframes with a frame to time sequencing, and emission is predetermined in each subframe
The light of color is launched synchronously with light, and control comprises the said bilayer of said first and second liquid crystal cells
The state that the transmittance of a plurality of viewing areas of structural panel and light cover, thus realize that color shows,
Wherein, this driving method is controlled by this way: make the viewing area that in a subframe, gets into the light shielding status get into another subframe,
Wherein, said first and second liquid crystal cells are formed in driving condition and the non-driven state relation of optical compensation mutually; When one of said first and second liquid crystal cells are in the ON state and another one when being in the OFF state, said liquid crystal indicator transmitted light.
14. the driving method of liquid crystal indicator according to claim 13, wherein:
Each frame comprises first subframe and second subframe;
The emission color of said light source comprises first color and second color; And
In the viewing area different with the viewing area of said first color of transmission in said first subframe, the transmission in said second subframe of said second color.
15. the driving method of a liquid crystal indicator, this liquid crystal indicator comprises:
First liquid crystal cells; Comprise first pair of opposing substrates and remain on first liquid crystal layer between said first pair of substrate; Said first pair of substrate has the first pair of pixel electrode that is used to show book character and numeral at least, and the orientation state of said first liquid crystal layer can be controlled through the voltage that adjustment is applied on said first pair of pixel electrode;
Second liquid crystal cells; Comprise second pair of opposing substrates and remain on second liquid crystal layer between said second pair of substrate; Said second pair of substrate has the second pair of pixel electrode that is used for covering fully the said book character and the zone of numeral, and the orientation state of said second liquid crystal layer can be controlled through the voltage that adjustment is applied on said second pair of pixel electrode;
Two crossed polarizerses, the normal direction of the said substrate in edge is arranged on the both sides of the double-decker panel that comprises said first and second liquid crystal cells;
Light source can be launched the light of multicolour; And
Control circuit; Time sequencing a frame is divided into a plurality of subframes; The light of emission pre-color in each subframe, with light emission synchronously, control comprises transmittance and the state that light covers of a plurality of viewing areas of the said double-decker panel of said first and second liquid crystal cells; Thereby realize colored the demonstration
Wherein, this driving method is controlled by this way: gray scale shows to be implemented with the middle orientation state that has between driving condition and the non-driven state through the orientation state of controlling the liquid crystal of at least one in said first and second liquid crystal cells,
Wherein, said first and second liquid crystal cells are formed in driving condition and the non-driven state relation of optical compensation mutually; When one of said first and second liquid crystal cells are in the ON state and another one when being in the OFF state, said liquid crystal indicator transmitted light.
16. the driving method of liquid crystal indicator according to claim 15, wherein:
The viewing area that in a subframe, gets into the transmittance state is controlled as and in another subframe, gets into the light shielding status;
Each frame comprises at least the first subframe and second subframe;
Said light source can be launched at least the first color and second color; And
In the viewing area different with the viewing area of said first color of transmission in said first subframe, the transmission in said second subframe of said second color.
17. the driving method of liquid crystal indicator according to claim 15, wherein mixed color shows through transmission one primary lights in each said subframe and viewing area entering transmittance state is implemented.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP274730/06 | 2006-10-06 | ||
| JP2006274730A JP2008096481A (en) | 2006-10-06 | 2006-10-06 | Field sequential liquid crystal display device |
| JP066255/07 | 2007-03-15 | ||
| JP2007066255A JP5052170B2 (en) | 2007-03-15 | 2007-03-15 | Liquid crystal display element, projection display device using the same, and driving method thereof |
| JP2007087912A JP5052933B2 (en) | 2007-03-29 | 2007-03-29 | Liquid crystal display element, projection display device using the same, and driving method thereof |
| JP087912/07 | 2007-03-29 |
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| Publication Number | Publication Date |
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| CN101196633A CN101196633A (en) | 2008-06-11 |
| CN101196633B true CN101196633B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007103051414A Expired - Fee Related CN101196633B (en) | 2006-10-06 | 2007-10-08 | Field sequentially driven liquid crystal display device |
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| JP (1) | JP2008096481A (en) |
| CN (1) | CN101196633B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101414441A (en) * | 2007-10-19 | 2009-04-22 | 陈国平 | Color liquid crystal display device driven by field sequence and drive method thereof |
| JP2010266746A (en) * | 2009-05-15 | 2010-11-25 | Stanley Electric Co Ltd | Liquid crystal display device |
| DE112011101260T5 (en) | 2010-04-09 | 2013-05-02 | Semiconductor Energy Laboratory Co., Ltd. | A liquid crystal display device and method for driving the same |
| WO2014017344A1 (en) * | 2012-07-24 | 2014-01-30 | シャープ株式会社 | Image display device and driving method therefor |
| CN102981328B (en) * | 2012-12-24 | 2015-12-23 | 天马微电子股份有限公司 | The liquid crystal indicator of negative field sequential and driving method thereof |
| CN103293757B (en) | 2013-05-30 | 2015-08-05 | 京东方科技集团股份有限公司 | Display device and display system |
| TWI556224B (en) * | 2015-11-30 | 2016-11-01 | 友達光電股份有限公司 | Field sequential color displaying method and field sequential color displaying device |
| CN117133249B (en) * | 2023-08-31 | 2024-05-28 | 惠科股份有限公司 | Driving method of display device and display device |
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| JPS5683778A (en) * | 1979-12-12 | 1981-07-08 | Nissan Motor | Liquid crystal digital display unit |
| JPS58138975U (en) * | 1981-11-20 | 1983-09-19 | リコーエレメックス株式会社 | display device |
| JPS61286815A (en) * | 1985-06-14 | 1986-12-17 | Alps Electric Co Ltd | Liquid crystal display element |
| JPS62176830U (en) * | 1986-04-28 | 1987-11-10 | ||
| JPH01191123A (en) * | 1988-01-27 | 1989-08-01 | Seiko Epson Corp | Liquid crystal optical shutter |
| JPH02111119U (en) * | 1989-02-23 | 1990-09-05 | ||
| JPH0455828A (en) * | 1990-06-25 | 1992-02-24 | Sharp Corp | Color liquid crystal display device |
| JPH06222379A (en) * | 1993-01-28 | 1994-08-12 | Kenwood Corp | Liquid crystal display |
| JPH10239702A (en) * | 1997-02-28 | 1998-09-11 | Toshiba Corp | Laminated gh liquid crystal display element |
| JP3861682B2 (en) * | 2000-12-27 | 2006-12-20 | カシオ計算機株式会社 | Field sequential liquid crystal display |
| JP2004029154A (en) * | 2002-06-21 | 2004-01-29 | Optrex Corp | Method for driving liquid crystal display |
| JP2004258372A (en) * | 2003-02-26 | 2004-09-16 | Optrex Corp | Liquid crystal display device |
| JP2004294824A (en) * | 2003-03-27 | 2004-10-21 | Optrex Corp | Liquid crystal display device |
| JP4721252B2 (en) * | 2003-08-05 | 2011-07-13 | スタンレー電気株式会社 | Normally white type LCD |
| JP4315823B2 (en) * | 2004-01-19 | 2009-08-19 | シャープ株式会社 | Line liquid crystal optical shutter array and control method thereof, and liquid crystal printer head, control method thereof and printer |
| JP2006084936A (en) * | 2004-09-17 | 2006-03-30 | Stanley Electric Co Ltd | Liquid crystal display element |
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2006
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| CN101196633A (en) | 2008-06-11 |
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