CN101149540A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
CN101149540A
CN101149540A CN 200710153437 CN200710153437A CN101149540A CN 101149540 A CN101149540 A CN 101149540A CN 200710153437 CN200710153437 CN 200710153437 CN 200710153437 A CN200710153437 A CN 200710153437A CN 101149540 A CN101149540 A CN 101149540A
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China
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mentioned
electrode
liquid crystal
substrate
current potential
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CN 200710153437
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CN101149540B (en
Inventor
三井雅志
小间德夫
小野木智英
濑川泰生
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Japan Display West Inc
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Sanyo Epson Imaging Devices Corp
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Priority claimed from JP2006356455A external-priority patent/JP4259575B2/en
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Abstract

A liquid crystal display device includes a first substrate having a first electrode and a second electrode, a second substrate, a liquid crystal interposed between the first substrate and the second substrate, pixels each having a transmissive portion for performing a transmissive display and a reflective portion for performing a reflective display, and a driving circuit driving the pixels. Here, a third electrode is disposed in the second substrate opposed to the first substrate with the liquid crystal interposed therebetween. The first electrode is disposed in the transmissive portion along with the second electrode and is also disposed in the reflective portion along with the third electrode. The driving circuit is provided to independently apply potentials to the second electrode and the third electrode.

Description

Liquid crystal indicator
Technical field
The present invention relates to a kind of liquid crystal indicator, particularly relate to and a kind ofly in a pixel, have the portion that sees through that carries out transmission display and reflect the reflecting part of demonstration, and possess the liquid crystal indicator that has in order to two electrodes of the orientation of control liquid crystal at side's substrate.
Background technology
As the liquid crystal panel of wide viewing angle, FFS (Fringe Field Switching is for example arranged; The fringe field conversion) mode and IPS (In-Plane Switching; The transverse electric field conversion) liquid crystal panel of mode.In these modes, in component substrate pixel electrode and common electrode are set, and result from two interelectrode electric fields by control, make the liquid crystal molecule rotation with control orientation state.
Reflection-type that the reflection that liquid crystal panel roughly is divided into the infiltration type that utilizes light backlight to show, utilize extraneous light shows and the semi-transmission type that in a pixel, is manufactured with infiltration type and two kinds of structures of reflection-type.
Patent document 1: TOHKEMY 2003-270627 communique
Patent document 2: TOHKEMY 2004-198922 communique
Patent document 3: TOHKEMY 2005-338256 communique
Patent document 4: TOHKEMY 2003-344837 communique
Summary of the invention
(problem that invention institute desire solves)
Existing TN (TwistNematic; Twisted nematic) mode and ECB (ElcetricalControlled Birefregence; Electric double refraction control) contrast of the semi-transmission type of mode and insufficient, the visual angle is also narrow.In addition, VA (Vertical Alignment; Vertical orientation) though the semi-transmission type contrast of mode is high and the visual angle can be enlarged, the problem that color can change in low visual angle is arranged.
With respect to the situation of above-mentioned TN mode and ECB mode, under the situation of the semi-transmission type of FFS mode or IPS mode, viewing angle characteristic is good, and the change color in the low visual angle that can see as the VA mode lacking very.Yet, have in order to have the advantage that transmission display and reflection show simultaneously and must stick phase retardation film or polarizer, therefore the problem that reduces contrast is arranged.And, compare with the infiltration type of FFS mode or IPS mode, the problem of liquid crystal indicator thickening is arranged.
The objective of the invention is in a pixel, to have in order to the portion that sees through that carries out transmission display with in order to reflect the reflecting part of demonstration, and possess in the liquid crystal indicator of two electrodes that has in order to the orientation of control liquid crystal at side's substrate, obtain good demonstration.
(solving the means of problem)
Liquid crystal indicator of the present invention, liquid crystal is seized on both sides by the arms between first substrate and second substrate, in a pixel, have the portion that sees through that carries out transmission display and reflect the reflecting part of demonstration, liquid crystal indicator of the present invention also possesses and has, possess first electrode and second electrode aforementioned first substrate, and drive the driving circuit of aforementioned pixel, liquid crystal indicator of the present invention is characterised in that: possessing third electrode across foregoing liquid crystal with aforementioned second substrate of the aforementioned first substrate subtend; Aforementioned first electrode is arranged at the aforementioned portion that sees through with aforementioned second electrode, and first electrode also is arranged at aforementioned reflecting part with aforementioned third electrode on the other hand; Aforementioned driving circuit is set to apply independently current potential in aforementioned second electrode and aforementioned third electrode.
According to above-mentioned formation, can be by controlling reflecting part at first substrate and set first electrode and the third electrode of second substrate, can realize making the semitransparent liquid crystal display of FFS mode with wide viewing angle etc. through portion.At this moment owing to seeing through portion's configuration phase difference layer, so can suppress because of this phase separation layer cause through portion's contrast deterioration problem.
In addition, be preferably when applying shutoff (OFF) voltage between aforementioned first electrode and aforementioned second electrode time in the aforementioned portion that sees through, apply conducting (ON) voltage between aforementioned first electrode and aforementioned third electrode at aforementioned reflecting part, the foregoing liquid crystal orientation that makes aforementioned reflecting part is for roughly being orthogonal to aforementioned third electrode, and makes and aforementionedly see through portion and aforementioned reflecting part shows for showing slinkingly simultaneously.
In addition, be preferably when applying shutoff voltage at aforementioned reflecting part between aforementioned first electrode and aforementioned third electrode the time, apply forward voltage between aforementioned first electrode and aforementioned second electrode, make the aforementioned foregoing liquid crystal orientation that sees through portion be twisting states, and to make the aforementioned portion that sees through be bright demonstration with aforementioned reflecting part simultaneously around the normal of aforementioned second electrode.
In addition, liquid crystal indicator of the present invention is seized liquid crystal on both sides by the arms between first substrate and second substrate, in a pixel, have the portion that sees through that carries out transmission display and reflect the reflecting part of demonstration, liquid crystal indicator of the present invention is characterised in that aforementioned first substrate has: many data lines and many gate lines; A plurality of switch modules, corresponding to each infall of aforementioned data line and aforementioned gate line, configuration respectively; A plurality of first electrodes are connected to each output terminals of aforementioned a plurality of switch modules; And second electrode, be used between itself and aforementioned first electrode, applying electric field to drive liquid crystal molecule; Aforementioned second substrate has: third electrode is used for applying electric field to drive liquid crystal molecule between itself and aforementioned first electrode; The current potential of aforementioned second electrode and the current potential of aforementioned third electrode are inverting each other.
In addition, be preferably and include control circuit, make current potential with common aforementioned second electrode of aforementioned gate line, inverting each other with aforementioned third electrode, make the current potential counter-rotating in during the loop line before the selection signal is about to import this gate line, the time during also making its current potential maintenance one vertically after the input of selection signal.
In addition, liquid crystal indicator of the present invention is seized liquid crystal on both sides by the arms between first substrate and second substrate, have in a pixel and carry out seeing through portion and reflecting the reflecting part of demonstration of transmission display, liquid crystal indicator of the present invention is characterized as aforementioned first substrate to have: many data lines and many gate lines; A plurality of switch modules are distinguished corresponding and paired configuration with each infall of aforementioned data line and aforementioned gate line; First electrode is arranged at respectively, is connected to the aforementioned reflecting part and the aforementioned portion that sees through of each output terminal of aforementioned pair of switches assembly; And a plurality of second electrodes, between itself and aforementioned first electrode, be applied with electric field foregoing liquid crystal is driven; Aforementioned subtend substrate has third electrode, is used for applying electric field to drive foregoing liquid crystal between itself and aforementioned first electrode; The current potential of aforementioned second electrode and the current potential of aforementioned third electrode are inverting each other.
In addition, the aforementioned third electrode that is preferably each aforementioned gate line shows as reflection in the outside of viewing area and is connected to each other with the common electrode terminal; Aforementioned second electrode of each aforementioned gate line is connected to each other with the common electrode terminal as transmission display in the outside of viewing area; Aforementioned reflection shows the current potential of usefulness common electrode terminal and the current potential that aforementioned transmission display is used the common electrode terminal is inverting each other and current potential reverses in each horizontal period.
In addition, being preferably the aforementioned third electrode of odd-numbered line (row) of aforementioned gate line and aforementioned second electrode of even number line is connected to each other as the first common electrode terminal in the outside of viewing area; Aforementioned second electrode of the aforementioned third electrode of the even number line of aforementioned gate line and odd-numbered line is connected to each other as the second common electrode terminal in the outside of viewing area; Inverting each other and the current potential of the current potential of the current potential of the aforementioned first common electrode terminal and the aforementioned second common electrode terminal is according to 1 picture scanning counter-rotating.
In addition, be preferably aforementioned first substrate and be arranged at aforementioned reflecting part, and have the reflection demonstration with keeping electric capacity.
In addition, be preferably aforementioned reflection show with maintenance electric capacity have be used for its with aforementioned first electrode between form the reflection that keeps electric capacity and show and use the maintenance capacitance electrode; It is to show with the current potential of common electrode terminal identical with aforementioned reflection that aforementioned reflection shows with the current potential that keeps capacitance electrode.
In addition, the thickness setting that is preferably foregoing liquid crystal be the phase differential that makes reflecting part for/Δ nd=λ/4, the aforementioned phase differential that sees through portion be Δ nd=λ/2.
(effect of invention)
According to above-mentioned formation, can in a pixel, have, and possess in the liquid crystal indicator that has in order to two electrodes of the orientation of control liquid crystal at a side substrate through portion and reflecting part, obtain good demonstration.
Description of drawings
Fig. 1 is the synoptic diagram of the liquid crystal indicator of explanation embodiment of the present invention.
Fig. 2 is the synoptic diagram of the liquid crystal indicator of explanation embodiment of the present invention.
Fig. 3 is the synoptic diagram of the another kind of liquid crystal indicator of explanation embodiment of the present invention.
Fig. 4 is to be that the reflection display part of normal whitening, vertical electric field driven is the normal sectional view that shows the liquid crystal indicator of black formation in order to the transmission display portion that explanation transverse electric field drives.
Fig. 5 (a) to Fig. 5 (c) be the planimetric map corresponding with Fig. 4.
Fig. 6 is the planimetric map corresponding with Fig. 4, and the figure of the relation of expression and reflection demonstration usefulness common electrode.
Fig. 7 is the equivalent electrical circuit of the pixel in the liquid crystal indicator of prior art.
Fig. 8 is the equivalent electrical circuit of the pixel in the embodiment of the present invention.
Fig. 9 is illustrated in the show state of the variation of common current potential in the liquid crystal indicator of embodiment of the present invention and corresponding transmission display portion and the show state of reflection display part, and with the figure of transverse axis as the time.
Figure 10 is the concrete equivalent electrical circuit of the pixel of embodiment of the present invention.
Figure 11 is illustrated in the embodiment of the present invention, the figure of the formation of the display driver of relevant liquid crystal indicator.
Figure 12 is the sequential chart of the common electrode current potential corresponding with the formation of Figure 11.
Figure 13 is the sectional view of the liquid crystal indicator of embodiments of the present invention.
Figure 14 (a) to Figure 14 (c) be the planimetric map corresponding with Figure 13.
Figure 15 is the figure that shows the variation of Figure 14.
Figure 16 is the sectional view of the liquid crystal indicator of another formation in the embodiment of the present invention.
Figure 17 (a) and Figure 17 (b) are the planimetric maps corresponding with Figure 16.
Figure 18 represents in another embodiment, about the figure of the formation of the display driver of liquid crystal indicator.
Figure 19 is the sequential chart of the common electrode current potential corresponding with the formation of Figure 18.
Symbol description
50,410,510,511 liquid crystal indicators
60 liquid crystal panels
60T sees through portion
The 60R reflecting part
70 driving circuits
100,420,520,521 component substrate
112,212 light transmissive substrate
114 circuit layers
116 planarization films
118 reflectance coatings
120 first electrodes
122,434 dielectric films
124 second electrodes
126,437,443 slits
128,220 Polarizers
200,460 subtend substrates
214,466 colored filters
216 phase separation layers
218 third electrodes
300 liquid crystal
412 transmission display portions
414 reflection display parts
416 is backlight
418 component substrate lateral deviation tabula rasas
419 subtend substrate side Polarizers
422,462 glass substrate
423,425 switch modules
424 semiconductor layers
426 gate insulating films
428 gate electrodes
429 gate lines
430 interlayer dielectrics
431 data lines
432,433,435 source/drain electrodes
436,444 pixel electrodes (nesa coating)
438 reflecting electrodes
440 FFS dielectric films
441 reflections show with keeping capacitance electrode (nesa coating)
442 common electrodes (nesa coating)
447 pull out line
450 liquid crystal layers
462 glass substrate
464 knee-piece matrixes
Layer is adjusted in 468 reflector space gaps
470 reflections show uses common electrode
471,473, the RCOM reflection shows and uses the common electrode terminal
472 septs
480 viewing areas
488,492 common electrode control circuits
489,496,497 reflection demonstration common electrode contact points
490, TCOM transmission display common electrode terminal
491 reflections show with keeping the capacitance electrode terminal
494 first common electrode terminals
495 second common electrode terminals
ER, ET electric field
Embodiment
Below use diagram to describe embodiments of the present invention in detail.
Fig. 1 and Fig. 2 are the synoptic diagram of the liquid crystal indicator 50 of explanation embodiment of the present invention.Liquid crystal indicator 50 constitutes and includes: liquid crystal panel 60, in order to the driving circuit 70 that drives liquid crystal panel 60 and with the back lighting device of the not icon of liquid crystal panel 60 subtends configuration.And in Fig. 1 etc., show a pixel (being also referred to as point, sub-pixel (sub-pixel) etc.) of liquid crystal panel 60 with sectional view, and, only enclose hachure (hatching) in the key element of a part for fear of illustrated complicated.
Liquid crystal panel 60 be in a pixel, include in order to carry out transmission display see through the 60T of portion and in order to the semi-transmission type liquid crystal panel of the reflecting part 60R that reflects demonstration.And, see through 60T of portion and reflecting part 60R and not only be meant 2 dimensional region in the overlooking of pixel respectively, also be meant the 3D region of the liquid crystal panel 60 that this 2 dimensional region projection is defined in the thickness direction (being the overlapping direction of substrate 100,200 described later) of liquid crystal panel 60.
Here, illustrate liquid crystal panel 60 and carry out transmission display, and reflect the situation of demonstration by the ECB mode by the FFS mode.
Liquid crystal panel 60 constitutes and includes: component substrate 100, relative with component substrate 100 to subtend substrate 200 and be arranged on liquid crystal (or liquid crystal layer) 300 between two substrates 100,200.And liquid crystal 300 is that liquid crystal molecule is schematically illustrated.
Component substrate 100 constitutes and includes light transmissive substrate 112, and than light transmissive substrate 112 more close liquid crystal layer 300 sides of this light transmissive substrate 112 (promptly with respect to) also include: circuit layer 114, planarization film 116, reflectance coating 118, first electrode 120, dielectric film 122, second electrode 124 and not shown alignment film.
Light transmissive substrate 112 is made of for example transparent glass plate.
Circuit layer 114 is to be formed with various assemblies etc. and to be formed with layer in order to the circuit that drives pixel, includes for example pixel TFT (Thin Film Transistor; Thin film transistor (TFT)) and various distribution.Though omitted the detailed part of this circuit here, it also can be suitable for various circuit.Circuit layer 114 is configured on light transmissive substrate 112 across seeing through 60T of portion and reflecting part 60R.
Planarization film 116 is made of the resin that for example has insulativity and light transmission, and is disposed on the circuit layer 114 and is positioned at than circuit layer 114 more close liquid crystal layer 300 sides.Planarization film 116 is across seeing through 60T of portion and reflecting part 60R.The surface in the face of subtend substrate 200 sides of planarization film 116 is a flat surfaces in seeing through the 60T of portion, then forms concaveconvex shape in reflecting part 60R.This concaveconvex shape can form by the whole bag of tricks, and for example available photoresist material constitutes planarization film 116, and forms by pattern exposure and the video picture of carrying out this photoresist material.
In order to reflect demonstration, reflectance coating 118 be by the material that can reflect extraneous light (visible light) (for example aluminium etc.) constitute.Reflectance coating 118 is configured in reflecting part 60R, and is configured on the aforementioned male and fomale(M﹠F) of planarization film 116.The surface of subtend substrate 200 sides of reflectance coating 118 forms the concaveconvex shape identical with the male and fomale(M﹠F) of planarization film 116.
First electrode 120 is by for example ITO (Indium Tin Oxide; Indium tin oxide) etc. the light transmission conductive material constitutes.First electrode 120 is configured on the planarization film 116 and covers reflectance coating 118.First electrode 120 promptly is the common electrode that sees through 60T of portion and reflecting part 60R across seeing through 60T of portion and reflecting part 60R.The surface of subtend substrate 200 sides of first electrode 120 is smooth in seeing through the 60T of portion, then forms the identical concaveconvex shape of male and fomale(M﹠F) with reflectance coating 118 and planarization film 116 in reflecting part 60R.
And, have under the situation of electric conductivity at aforementioned reflectance coating 118, as long as first electrode 120 is connected with reflectance coating 118, then first electrode 120 also can be the form that does not cover entire emission film 118.That is, also can constitute the part of first electrode 120 in reflecting part 60R by reflectance coating 118.
In addition, for explanation first electrode 120 and being connected of driving circuit 70 schematically being illustrated in Fig. 1 etc., is to wait via the aforementioned pixel TFT in the circuit layer 114 for example to carry out but the current potential of first electrode 120 is applied.
Dielectric film 122 is to be made of for example institute such as monox, silicon nitride.In seeing through the 60T of portion, dielectric film 122 is configured on the aforementioned tabular surface of first electrode 120.Dielectric film 122 is smooth in the face of the surface of subtend substrate 200 sides.
Second electrode 124 is made of light transmission conductive materials such as for example ITO.In seeing through the 60T of portion, second electrode 124 is configured on the dielectric film 122, and across dielectric film 122 and with first electrode, 120 subtends.That is, pile up according to the order of first electrode 120, dielectric film 122, second electrode 124.Because two electrodes 124,120 are arranged at component substrate 100, so be positioned at same side with respect to liquid crystal layer 300.At second electrode 124, in part slit (Slit) 126 is set with first electrode, 120 subtends,, illustrate the situation that slit 126 extends the approximate vertical direction of drawing here.By the electric field ET that potential difference (PD) produced of first electrode 120 and second electrode 124 is across slit 126 and dielectric film 122 and produce (with reference to Fig. 2).Control the orientation state of liquid crystal 300 in seeing through the 60T of portion by this electric field ET.
In addition, for explanation second electrode 124 and being connected of driving circuit 70 schematically being illustrated in Fig. 1 etc., is to wait via the distributions in the circuit layer 114 for example to carry out but the current potential of second electrode 124 is applied.
The alignment film of icon is not configured to cover second electrode 124, dielectric film 122 and first electrode 120, and contact liquid crystal 300.
Subtend substrate 200 formations include light transmissive substrate 212, and, also include colored filter 214, phase separation layer 216, third electrode 218 and not shown alignment film locating than light transmissive substrate 212 insides liquid crystal 300 sides of this substrate 212 (promptly with respect to).
Light transmissive substrate 212 is made of for example transparent glass plate.
Colored filter 214 is made of the resin that for example dyeed, and is disposed on the light transmissive substrate 212 across seeing through 60T of portion and reflecting part 60R.By colored filter 214, light of injecting from component substrate 100 sides backlight and the extraneous light of injecting from subtend substrate 200 sides can be colored, and make pixel light up predetermined color.The color of colored filter 214 is set according to the demonstration look (monochrome) of each pixel.And, be called picture element (pixel) etc. with the unit that multiple color pixel was constituted that closely connects, the situation that this unit is called pixel is also arranged.
Here, illustrate the situation that phase separation layer 216 is equivalent to 1/4 wavelength (quarter-wave) plate.Under this situation, rectilinearly polarized light can be converted to the circularly polarized light of dextrorotation (or left-handed) by phase separation layer 216.Phase separation layer 216 is positioned at than colored filter 214 more close liquid crystal layer 300 sides, in reflecting part 60R for being disposed on the colored filter 214.In this situation, phase separation layer 216 is built in liquid crystal panel 60.Here, the so-called built-in configuration mode that is configured between the light transmissive substrate 112,212 that is meant.At this moment, for example aforesaid pixel TFT etc. also can be considered and is built in liquid crystal panel 60.
But phase separation layer 216 also can utilize for example ultraviolet ray constrictive type liquid crystal (UV curableliquid crystal; But hereinafter referred to as UV constrictive type liquid crystal) (liquid crystal that available ultraviolet ray is hardened) form.More specifically, on colored filter 214, form alignment film (not shown), but the UV constrictive type liquid crystal of coating liquid shape and irradiation ultraviolet radiation make its sclerosis on this alignment film, can form phase separation layer 216 thus.Under this situation, but phase separation layer 216 formations include UV constrictive type liquid crystal, perhaps also include aforementioned alignment film; And, but aforementioned alignment film is not the orientation in order to regulation liquid crystal 300 in order to the orientation of control UV constrictive type liquid crystal.But the aforementioned alignment film that can utilize various alignment films to use as UV constrictive type liquid crystal for example can utilize the light alignment film that produces the LCD alignment energy by rayed, and promptly need not rubbing (rubbing) by this light alignment film.But UV constrictive type liquid crystal has the function of polarizer by bestowing UV sclerosis (irradiation UV hardens).But this phase differential can be adjusted by the thickness that changes UV constrictive type liquid crystal.
Third electrode 218 is made of light transmission conductive materials such as for example ITO.Third electrode 218 is configured on the interior phase separation layer 216 of reflecting part 60R, and than phase separation layer 216 more close liquid crystal layer 300 sides, and across liquid crystal layer 300 and first electrode, 120 subtends.That is, third electrode 218 is positioned at the opposition side of first electrode 120 with respect to liquid crystal 300.Control the orientation state (with reference to Fig. 1) of liquid crystal 300 in reflecting part 60R by the electric field ER that potential difference (PD) produced by the third electrode 218 and first electrode 120.
In addition, in Fig. 1 etc., third electrode 218 and being connected of driving circuit 70 are schematically illustrated, wait and carry out but the current potential of third electrode 218 applied via the distribution in the circuit layer 114 for example and be disposed at electroconductive particle between substrate 100 and 200 for explanation.Third electrode 218 is set as, and applies with respect to the current potential of second electrode 124, can carry out the state that current potential applies independently.
The alignment film of icon is not configured to cover third electrode 218, phase separation layer 216 and colored filter 214, and is contacted with liquid crystal 300.
Liquid crystal panel 60 formations also include Polarizer 128,220.Polarizer 128 is disposed at the outside (promptly being disposed at the opposition side of the light transmissive substrate 112 relative with liquid crystal layer 300) of component substrate 100.Polarizer 220 is disposed at the outside (promptly being disposed at the opposition side of the light transmissive substrate 212 relative with liquid crystal layer 300) of subtend substrate 200.
Driving circuit 70 constitutes and includes various key elements, in order to connection electrode 120,124,218, and produce, reception and registration etc. is to the current potential that applies of electrode 120,124,218.Aforementioned various key element is arranged at liquid crystal panel 60 outsides, or is built in liquid crystal panel 60, or is installed on liquid crystal panel 60, and also includes pixel TFT in the circuit layer for example 114 etc.Driving circuit 70 produces the aforementioned current potential that applies, and is applied to electrode 120,124,218 with scheduled timing.Driving circuit 70 is configured to implement independently that current potential to second electrode 124 applies and the current potential of third electrode 218 is applied.
One example of the action of liquid crystal indicator 50 then is described.Here as above-mentioned, illustrate in the FFS mode and carry out transmission display, reflect the situation of demonstration in the ECB mode.In addition, the negative dielectric anisotropic of liquid crystal 300 is for example for just, and refractive index anisotropy (being also referred to as birefraction) Δ n for example is 0.1.
The potential difference (PD) that liquid crystal panel 60 constitutes at first electrode 120 and second electrode 124 is when turn-offing (OFF) voltage condition, it is that showing slinkingly of minimum state shown that transmission display can become brightness, and when the potential difference (PD) of first electrode 120 and third electrode 218 was the situation of shutoff voltage, the reflection demonstration can become the bright demonstration of brightness for high state.The brightness of transmission display is corresponding to transmitance, and the brightness that reflection shows is corresponding to reflectivity.In addition, show slinkingly and show that being also referred to as dark state shows etc. with black, bright demonstration is also referred to as bright state and shows etc. with white.In addition, to show or the voltage of bright demonstration and be called shutoff voltage for the voltage that can produce electric field ET, ER hardly in order to realize showing slinkingly, with respect to this, will show or the voltage of bright demonstration and be called conducting (ON) voltage in order to realize showing slinkingly for comparing the voltage that can produce big electric field ET, ER when applying shutoff voltage.
Therefore here, see through the 60T of portion and constitute the normal black formula (Normally BlackType) that shows, reflecting part 60R constitutes normal whitening mode (Normally White Type).This formation can wait by the material of liquid crystal 300, the characteristic of rubbing direction, Polarizer 128,220 and phase separation layer 216 of orientation state (so-called initial orientation state), alignment film of liquid crystal 300 when applying shutoff voltage or configuration and adjust.
In liquid crystal indicator 50, when between first electrode 120 and second electrode 124, being applied with shutoff voltage, by between first electrode 120 and third electrode 218, applying forward voltage reflecting part 60R is set as to show slinkingly and shows, thus, will be set as simultaneously to show slinkingly through the 60T of portion and reflecting part 60R and show.That is, whole pixel is set as to show slinkingly shows.On the other hand, when between first electrode 120 and third electrode 218, being applied with shutoff voltage, to be set as bright demonstration through the 60T of portion by between first electrode 120 and second electrode 124, applying forward voltage, thus, will be set as bright demonstration simultaneously through 60T of portion and reflecting part 60R.That is, whole pixel is set as bright demonstration.
An example more specifically below is described.
(embodiment 1)
For example, when applying shutoff voltage, in seeing through the 60T of portion and the major axis that makes liquid crystal 300 become liquid crystal molecule in the reflecting part 60R be roughly parallel to the surface of electrode 120,124,128, and make initial orientation become to be roughly parallel to the bearing of trend (therefore, making the approximate vertical direction of orientation) in slit 126 at drawing.In addition, in seeing through 60T of portion and reflecting part 60R, the rubbing direction setting becomes identical.In addition, Polarizer 128 is configured to make a major axis that roughly is orthogonal to the liquid crystal molecule of initial orientation state through axle.In addition, make seeing through axle and seeing through roughly quadrature and dispose Polarizer 220 (being so-called orthogonal configuration) of axle of Polarizer 128.
Under this situation, the transmission display (with reference to Fig. 1) when applying shutoff voltage, the light of injecting from component substrate 100 sides backlight becomes and the major axis of the liquid crystal molecule rectilinearly polarized light of quadrature roughly by Polarizer 128.According to the relation of the alignment direction of the polarization direction of this rectilinearly polarized light and liquid crystal molecule, owing to almost be not subjected to the birefringence effect of liquid crystal 300, this rectilinearly polarized light keeps polarized light state to arrive Polarizer 220.Yet, since this rectilinearly polarized light be with Polarizer 220 see through the roughly polarized light of orthogonal directions of axle, so can't see through Polarizer 220, result, transmission display become to show slinkingly and show.
As mentioned above, when applying shutoff voltage through the 60T of portion, reflecting part 60R is applied in forward voltage, shows (with reference to Fig. 1) so reflecting part 60R is set as to show slinkingly.In the reflecting part 60R that shows slinkingly when showing, liquid crystal alignment with the surface of electrode 120,218 direction of quadrature roughly.The extraneous light of injecting from subtend substrate 200 sides becomes rectilinearly polarized light by Polarizer 220, and becomes circularly polarized light by the phase separation layer 216 as the function of 1/4 wavelength plate, and is incident upon liquid crystal layer 300.According to the aforementioned orientation state of liquid crystal molecule, because this circularly polarized light almost is not subjected to the birefringence effect influence of liquid crystal 300, this circularly polarized light keeps polarized light state to arrive reflectance coating 118 and reflects.Circularly polarized light through reflection becomes rectilinearly polarized light by phase separation layer 216 once more.Yet, because sense of rotation (with respect to the sense of rotation of direct of travel) changeabout direction in forward path and return path of aforementioned circularly polarized light, so rectilinearly polarized light in the return path and the rectilinearly polarized light in the forward path be quadrature roughly, promptly be with Polarizer 220 see through the roughly polarized light of orthogonal directions of axle.Therefore, can't see through Polarizer 220, the result, reflection shows to become to show slinkingly and shows.
On the other hand, when pixel is set as bright demonstration, apply shutoff voltage at reflecting part 60R, and applying forward voltage (with reference to Fig. 2) through the 60T of portion as above-mentioned.
In seeing through the 60T of portion, by applying forward voltage, near the liquid crystal alignments the component substrate 100 become to be roughly parallel to the surface of electrode 120,124, and orientation with the bearing of trend in slit 126 direction of quadrature roughly.On the other hand, near the liquid crystal molecule the subtend substrate 200 keeps initial orientation state.Therefore, see through in the 60T of portion liquid crystal molecule generally speaking orientation become normal to be 90 ° twisting states around electrode 124,120.Under this situation, the light backlight that becomes rectilinearly polarized light by Polarizer 128 be with component substrate 100 near the polarized light of major axis almost parallel direction of liquid crystal molecule, and the optically-active (rotation) with the aforementioned orientation state that reverses of liquid crystal molecule, and the time point that arrives Polarizer 220 become with subtend substrate 200 near the rectilinearly polarized light of major axis almost parallel of liquid crystal molecule.Because this rectilinearly polarized light is and the polarized light that sees through the axle almost parallel of Polarizer 220 that so see through Polarizer 220, result, transmission display become bright demonstration.
Apply at reflecting part 60R under the situation of shutoff voltage, liquid crystal 300 orientations of reflecting part 60R become and are applied with the identical through the 60T of portion of shutoff voltage.Under this situation, the extraneous light of injecting from subtend substrate 200 sides is subjected to the influence of the birefringence effect of liquid crystal layer 300 entering when showing slinkingly path (light path) identical when showing.Here, to utilize its birefringence and be adjusted to 1/4 wavelength plate be identical effect to the liquid crystal layer 300 of reflecting part 60R.Extraneous light becomes circularly polarized light by seeing through Polarizer 220 and phase separation layer 216, and becomes rectilinearly polarized light by the liquid crystal layer 300 as the function of 1/4 wavelength plate, and in reflectance coating 118 reflections.Rectilinearly polarized light through reflection becomes circularly polarized light by liquid crystal layer 300, and arrives phase separation layer 216.At this moment, because the circularly polarized light in the return path becomes identical with the sense of rotation of circularly polarized light in the forward path, so, promptly be the polarized light that sees through the axle almost parallel with Polarizer 220 once more through rectilinearly polarized light behind the phase separation layer 216 and the rectilinearly polarized light almost parallel in the forward path.Therefore, see through Polarizer 220, the result, the reflection demonstration becomes bright demonstration.
Though above-mentioned light and shade shows and the situation of bright demonstration, also can show slinkingly by the size that control applies voltage show and bright demonstration between the demonstration (being that so-called shadow tone shows) of the accurate brightness in position.
According to above-mentioned formation, owing to see through the 60T of portion is that FFS mode, reflecting part 60R are the ECB mode, when seeing through the 60T of portion conducting reflecting part 60R are set as shutoff, will be set as conducting through the 60T of portion when reflecting part 60R turn-offs, so in reflection demonstration and transmission display, can both obtain good demonstration.In addition, because built-in phase separation layer 216, so outside phase separation layer need not being attached to, compare with the semi-transmission type of alternate manner, can be with the liquid crystal panel attenuation.And, become the layer narrower by phase separation layer 216 double as for dwindling, so can reduce manufacturing step than the gap of liquid crystal cell that sees through the 60T of portion in order to cell gap (cell gap) with reflecting part 60R.
In addition owing to use the ECB mode higher to constitute reflecting part 60R than the reflectivity of FFS mode, so with use the FFS mode to constitute to compare with the situation of reflecting part 60R through the 60T of portion, the reflection that can obtain high brightness shows.
And, because reflecting part 60R does not adopt the FFS mode, so even when planarization film 116 forms aforementioned male and fomale(M﹠F), need not on this male and fomale(M﹠F), form electrode 124 with slit 126 yet.Therefore, can not produce the bad problem of the patterning in slit on the male and fomale(M﹠F), can obtain good reflection and show.In addition, about transmission display, realize wide viewing angle and high-contrast etc. by the FFS mode.
In addition, in the FFS mode,,, shielding structure need not be set externally according to above-mentioned formation though general most outside at the subtend substrate forms ITO film etc. to cover (shield) electric field from the outside.This is because the third electrode 218 of subtend substrate 200 has bridging effect.And, even not subtend substrate 200 do the tight setting comprehensively, also can obtain bridging effect by third electrode 218.
In addition because phase separation layer 216 is not arranged at the 60T through portion, so with do not distinguish through the 60T of portion with reflecting part 60R and the situation that whole ground is arranged at the outside is different, can guarantee the wide viewing angle that obtained in the FFS mode and high-contrast etc. at transmission display.
In addition, make the gap of liquid crystal cell of reflecting part 60R than the gap of liquid crystal cell that sees through the 60T of portion also narrow (being so-called gap (multi gap) structure that manys) by phase separation layer 216.Therefore, though not in addition use face be coated with (top coat) layer, also can see through 60T of portion and reflecting part 60R adjustment gap of liquid crystal cell.For example, the gap of liquid crystal cell of reflecting part 60R can be adjusted to the value that is suitable for the ECB mode.
In addition, though illustrate the situation of carrying out transmission display by the FFS mode in above-mentioned, also can constitute and carry out transmission display by the IPS mode.During for the IPS mode, as shown in Figure 3, in seeing through the 60T of portion, first electrode 120 and second electrode 124 are disposed on the planarization film 116, promptly are disposed at on one deck.In addition, Fig. 3 is the state that illustrates when pixel is whole to be bright the demonstration.
In addition, the axle that sees through that for example Polarizer 128,220 is configured to each other is almost parallel, also can change normal black formula and the normal whitening mode of showing thus.
In addition, both can implement current potential to second electrode 124 independently and apply with current potential to third electrode 218 and apply, also can be to apply mode with above-mentioned different current potential.For example, when the threshold value current potential that sees through 60T of portion and reflecting part 60R not simultaneously, by electrode 124,218 is applied different current potentials independently, can reduce transmission display that is caused because of above-mentioned threshold value current potential difference and the luminance difference that reflects demonstration, and obtain good demonstration.
Then, use Fig. 4 to Fig. 7, at using transverse electric field type of drive, use in the liquid crystal indicator of vertical electric field driven mode at reflection display part (reflecting part) in transmission display portion (through portion), it is that normal whitening, reflection display part are illustrated for the normal machine that shows the TFT that deceives that use has transmission display portion.Here, though the person is illustrated at having the colored filter, also can carry out white and black displays.In addition, as transverse electric field type of drive, except the FFS mode, also can use for example formation of IPS mode.
Here, Fig. 4 to Fig. 6 uses transverse electric field type of drive, is reflecting the figure that display part uses the formation of the liquid crystal indicator 410 of indulging the electric field driven mode in transmission display portion in order to explanation.Here, so-called vertical electric field driven mode is to be presented to apply electric field between component substrate and the subtend substrate to drive the mode of liquid crystal molecule.In addition, as transverse electric field type of drive, be on same substrate, to use, apply electric field between common electrode that disposes clipping insulation course and the pixel electrode, drive the FFS mode of liquid crystal molecule.
Fig. 4 is the sectional view of a sub-pixel portion in the liquid crystal indicator 410.Here, so-called sub-pixel is when for example carrying out colour demonstration with R, G, B, with R, G, each display part that B is corresponding, here in the example, these three sub-pixels of sub-pixel of the sub-pixel of the sub-pixel of R, G, B as unit, and are become a pixel (pixel).Liquid crystal indicator 410 formations include transmission display portion 412 and reflection display part 414.In the example of Fig. 4, liquid crystal indicator 410 formations include: backlight 416; Component substrate 420 as first substrate; Subtend substrate 460 as second substrate; Liquid crystal layer 450 is seized on both sides by the arms between component substrate 420 and subtend substrate 460; Component substrate lateral deviation tabula rasa 418, be disposed at backlight 416 and component substrate 420 between; And subtend substrate side Polarizer 419, be disposed at the outside of subtend substrate 460.
In liquid crystal indicator 410, subtend substrate 460 is in the side in the face of the user.That is user's light and shade that optical characteristics produced of coming Visual Confirmation liquid crystal layer 450, from subtend substrate 460 sides.In Fig. 4, in transmission display portion 412, the light from backlight 416 arrives user's eyes via component substrate lateral deviation tabula rasa 418, component substrate 420, liquid crystal layer 450, subtend substrate 460, subtend substrate side Polarizer 419.In addition, in reflection display part 414, extraneous light arrives liquid crystal layer 450 via subtend substrate side Polarizer 419, subtend substrate 460, and be reflected at the reflecting electrode 438 of component substrate 420, arrive user's eyes once more via liquid crystal layer 450, subtend substrate 460, subtend substrate side Polarizer 419.
Subtend substrate 460 constitutes by piling up several layers film.In the example of Fig. 4, from subtend substrate side Polarizer 419 side orientating component substrates 420 sides, formation includes: glass substrate 462, block matrices 464, colored filter 466, reflector space gap are adjusted layer 468, are shown with common electrode 470 and sept (spacer) 472 as the reflection of reflecting common electrode in the display part 414.Because these materials, specification, formation method etc. can use known material, specification, formation method etc. to be used as the manufacture method of general drive matrix type liquid crystal, so omit detailed explanation.
Here, because becoming, reflection display part 414 light paths are two times of transmission display portion 412 light paths, so reflector space gap adjustment layer 468 is provided in and is used for carrying out half-wavelength (λ/2) light modulation in the infiltration type display mode, is used for carrying out quarter-wave (λ/4) light modulation in the reflection-type display mode.As shown in Figure 4, adjust layer 468, and make the thickness generation difference of thickness and the liquid crystal layer 450 of transmission display portion 412 of the liquid crystal layer 450 of reflection display part 414 by the reflector space gap is set.The thickness of this liquid crystal layer 450 is adjusted by the thickness of reflector space gap adjustment layer 468, and reflection display part 414 becomes phase difference nd=λ/4, transmission display portion 412 becomes phase difference nd=λ/2 thereby make.In addition, the structure of this reflector space gap adjustment layer uses too in embodiments of the present invention.
Component substrate 420 is also referred to as components side substrate, TFT substrate or TFT side substrate, and be dispose the substrate of switch module side, also be relatively in the substrate of subtend substrate 460.Form technology and pattern formation technology by known film, on component substrate 420, pile up a plurality of films that are patterned into multi-ply construction.
In the example of Fig. 4, be formed with glass substrate 422, semiconductor layer 424, gate insulating film 426, gate electrode 428, interlayer dielectric 430, source/drain electrodes 432,433, dielectric film 434, common electrode 442, FFS dielectric film 440, reflecting electrode 438 and pixel electrode 436 in regular turn from 416 sides backlight towards liquid crystal layer 450 sides.Because these materials, specification, formation method etc. can use known material, specification, formation method etc. to be used as the manufacture method of general drive matrix type liquid crystal, so omit detailed explanation.
Here, the structure that correlates with FFS mode in the transmission display portion 412 constitutes, be formed common electrode 442 on the dielectric film 434 and on common electrode 442 across FFS dielectric film 440 and the pixel electrode 436 of configuration.At pixel electrode 436 slit 437 is set,, between common electrode 442 and pixel electrode 436, applies electric field,, drive liquid crystal layer 450 with lateral electric field type by this electric field by this slit 437.
On the other hand, the formation that correlates with the vertical electric field driven mode of reflection in the display part 414, though also be formed common electrode 442 on the dielectric film 434 and on common electrode 442 across FFS dielectric film 440 and the configuration pixel electrode 436, difference is that reflecting electrode 438 is configured part.Here, reflecting electrode 438 just formation after forming common electrode 442 and FFS dielectric film 440, and become the formation that is connected with afterwards pixel electrode 436.Reflecting electrode 438 is to have in order to will reflex to the conductive reflecting film of the function of subtend substrate 460 sides from the light of subtend substrate 460 sides once more.In addition, across FFS dielectric film 440, and have the function of formation between common electrode 442 and the pixel electrode 436 in order to the maintenance electric capacity that drives liquid crystal layer 450.
In addition, though omit diagram in Fig. 4, common electrode 442 is provided with alignment film.The face relative with liquid crystal layer 450 at subtend substrate 460 is provided with alignment film too.
Fig. 5 is the planimetric map corresponding with the sectional view of Fig. 4.Here, at the pixel that sub-pixel constituted by three, the state of order display module substrate 420 stacking constructions step midway.In addition, Fig. 4 is equivalent to shown in Fig. 5 (a) sectional view along the A-A line.Fig. 5 (a) is presented at the state after forming dielectric film 434 on the source/drain electrodes 432,433 and offering contact hole (contact hole).Fig. 5 (b) shows the state behind formation common electrode 442 and the reflecting electrode 438.Fig. 5 (c) demonstration forms the state behind the pixel electrode 436 with slit 437.In the example of Fig. 5,, according to circumstances, also common electrode 442 can be set as and be separated in each sub-pixel though show the state that common electrode 442 forms across a plurality of pixels.Yet, need be in order to supply with the auxiliary distribution of current potential to each common electrode.
Fig. 6 is the figure that expression and the reflection in the subtend substrate show the relation of using common electrode 470.Reflection show with common electrode 470 with relative with the part that reflects display part 414 to mode be disposed on the subtend substrate.
Get back to Fig. 5 (a), become gate line 429 and data line 431 to be mutually orthogonal at each sub-pixel distribution, and at its infall deploy switch assembly 425.Gate line 429 forms gate electrode shown in Figure 4 428 at switch module 425 places, and data line 431 is connected in source/drain electrodes shown in Figure 4 432.So, liquid crystal indicator 410 is the liquid crystal indicators that dispose switch module 425 at many gate lines 429 and each infall of many data lines 431 respectively, promptly so-called drive matrix type liquid crystal.In addition, gate line 429 is also referred to as sweep trace, scan signal line etc., and data line 431 is also referred to as signal wire, video (Video) signal wire, signal of video signal line etc.
Switch module 425 is by being constituted at formed gate insulating film 426 on the semiconductor layer shown in Figure 4 424, the transistor component that source/drain constituted that is arranged at the gate electrode 428 on the gate insulating film 426 and is connected in source/drain electrodes 432,433, for example can being made of institutes such as TFT.The either party of the source/drain of switch module 425 (for example drain electrode) is connected to data line 431, and the opposing party's (for example source electrode) is connected to pixel electrode 436.Because drain electrode has interchangeability with source electrode, thus also source electrode be connected to data line 431, drain electrode is connected to pixel electrode 436.Switch module 425 is selected by gate line 429 and is made conducting between drain electrode and the source electrode, and the vision signal of supplying with the data line 431 that is connected from drain electrode in above-mentioned example is to pixel electrode 436.
Below be illustrated at the demonstration of the liquid crystal indicator 410 of above-mentioned formation.Here, the relation of the orientation axle of the polarizing axis of Polarizer and liquid crystal molecule is generally set for as following.Promptly, it is orthogonal that two Polarizers in glass substrate 422,462 outsides (being component substrate lateral deviation tabula rasa 418 and subtend substrate side Polarizer 419) are set polarizing axis for, and the polarizing axis of either party's Polarizer set for the driving voltage that applies towards liquid crystal layer 450 for the state that turn-offs under, be 45 degree with the orientation axle of liquid crystal molecule.Then, be under the state of conducting at driving voltage, it is parallel that the orientation axle of the liquid crystal molecule in the transmission display portion 412 constitutes with its polarizing axis.On the other hand, it is under the state of conducting that the liquid crystal molecule of reflection in the display part 414 constitutes at driving voltage, is vertically with respect to the surface of glass substrate 422,462 to erect.
Above-mentioned formation, in transmission display portion 412, under the state of driving voltage for shutoff, can become rectilinearly polarized light by component substrate lateral deviation tabula rasa 418 from backlight 416 light of injecting, when by liquid crystal layer 450, produce the phase differential of λ/2, become and revolve the rectilinearly polarized light that turn 90 degrees, and become white demonstration (normal whitening) by subtend substrate side Polarizer 419.Here as above-mentioned, in transmission display portion 412, because the thickness of liquid crystal layer 450 is adjusted to phase difference nd=λ/2, so at driving voltage is under the state of conducting, even since by liquid crystal layer 450 owing to can not produce phase differential yet, so the rectilinearly polarized light of injecting is absorbed by subtend substrate side Polarizer 419, and becomes black the demonstration.
With respect to this, be adjusted in the reflection display part 414 of Δ nd=λ/4 at the thickness of liquid crystal layer, become as following.The light of injecting becomes the light of rectilinearly polarized light by subtend substrate side Polarizer 419, driving voltage for the state that turn-offs under during by liquid crystal layer 450, produce the phase differential of λ/4, and become circularly polarized light towards dextrorotation.Then, the electrode 438 that is reflected reflects and becomes left-handed circularly polarized light, and becomes the rectilinearly polarized light of 90 degree rotations by liquid crystal layer 450 once more, and is become black demonstration (normal showing deceives) by 419 absorptions of subtend substrate side Polarizer.Because at driving voltage is under the state of conducting, liquid crystal molecule is vertically with respect to the surface of glass substrate 422,462 and erects, and because the light of injecting can not produce phase differential by liquid crystal layer 450 time, so reflected light directly returns with the state of rectilinearly polarized light, and become white demonstration by subtend substrate side Polarizer 419.
So, in transmission display portion 412 and reflection display part 414, with respect to driving voltage (being liquid crystal applied voltages), the variation meeting changeabout of transmitance.That is, under driving voltage normal (normally) state for shutoff, transmission display portion 412 becomes white demonstration (being so-called normal whitening), and on the other hand, reflection display part 414 becomes black demonstration the (being so-called normal apparent black).Then opposite when driving voltage is conducting, transmission display portion 412 becomes black the demonstration, and reflection display part 414 becomes white demonstration.So, in identical sub-pixel, become the counter-rotating that between transmission display portion 412 and reflection display part 414, produces demonstration.This is described in the prior art in transmission display portion use transverse electric field type of drive, in the problem that the liquid crystal indicator of electric field driven mode is indulged in the use of reflection display part, also is problem of the present invention.
Here, the driving method of liquid crystal indicator is described, Fig. 7 is the equivalent circuit diagram of pixel.Here, pixel refers to a sub-pixel.Below, use the symbol of Fig. 4 to Fig. 7 to illustrate.As above-mentioned, with the gate line shown in the Gate 429, dispose switch module 425, and between the pixel electrode 436 of the output terminal that is connected in switch module 425 and common electrode 422, form electric capacity as the sub-pixel of pixel with infall with the data line shown in the Video 431.In Fig. 7, the maintenance capacitance meter in the transmission display portion 412 is shown as TC SC, the liquid crystal capacitance in the transmission display portion 412 is expressed as TC LC, the maintenance capacitance meter that will reflect in the display part 414 is shown as RC SC, the liquid crystal capacitance that will reflect in the display part 414 is expressed as RC LCKeep electric capacity TC SCWith RC SCBe formed between pixel electrode 436 and the common electrode 442 across FFS dielectric film 440.
In this equivalence circuit, when when the driving circuit of icon is not selected gate line 429, switch module 425 becomes conducting state, at each electric capacity TC SC, TC LC, RC SC, RC LCAccumulate the corresponding electric charge of potential difference (PD) that has with 422 of data line 431 and common electrodes, and the liquid crystal layer 450 in the zone of each sub-pixel is applied with the corresponding electric field of potential difference (PD) with 422 of pixel electrode 436 and common electrodes.And, during the maintenance of non-selected gate line 429 in, the current potential of pixel electrode 436 is by these electric capacity TC SC, TC LC, RC SC, RC LCKeep.
In liquid crystal indicator, in order to suppress the demonstration deterioration of ghost etc., carry out the signal of video signal voltage (negative polarity) of the signal of video signal voltage (positive polarity) of hot side and low potential side pixel current potential, alternatively be entered as common electrode current potential with the predetermined cycle as the current potential of common electrode 442 as the current potential of pixel electrode 436.That is, liquid crystal layer 450 is by AC driving.As this AC driving mode, can use following two kinds of methods to liquid crystal layer 450.
A kind of method is for being fixed on predetermined value with the current potential of common electrode 442, and makes the signal of video signal voltage that is applied to pixel electrode 436 be changed to the mode of negative polarity by positive polarity, and this mode is called as common electrode direct current (DC) driving method.Another kind method is that the common electrode current potential is also changed between noble potential and electronegative potential in the predetermined cycle, and this mode is called as common electrode and exchanges (AC) driving method.In this case, when the common electrode current potential is in noble potential, use the negative polarity current potential, on the contrary, when the common electrode current potential is in electronegative potential, use the positive polarity current potential as signal of video signal voltage as signal of video signal voltage.Generally speaking, compare with common electrode direct drive method, common electrode AC driving method can be dwindled the output amplitude of signal of video signal, and can suppress the consumption electric power of circuit and reduce the cost of circuit.
In addition, the mode that in a vertical period signal of video signal voltage is reversed between positive polarity and negative polarity is called news frame (frame) inversion driving method, and the mode that signal of video signal voltage is reversed in a horizontal period between positive polarity and negative polarity is called H (level) line inversion driving method.
Here, use common electrode AC driving method and H line inversion driving method, can suppress ghost etc., and the signal of video signal amplitude can be dwindled, and can suppress the inhomogeneous etc. of picture by the equalization of display frame.Therefore, short of specializing uses common electrode AC driving method and H line inversion driving method to describe in following.
Below, be illustrated at embodiments of the present invention.In following, the key element identical with the key element that has illustrated among Fig. 3 to Fig. 7 enclosed identical symbol, and omits detailed explanation.Fig. 8 is the key diagram of embodiments of the present invention key concept.That is, common electrode is separated with reflection display part 414 in transmission display portion 412, and be set as and apply independently current potential separately.Particularly, the common electrode that is used in transmission display portion 412 is called transmission display common electrode 442, the common electrode that will be used to reflect display part 414 is called reflection and shows with common electrode 470, and with transmission display with the current potential of common electrode 442 with reflect the potential setting of demonstration and become inverting each other with common electrode 470.In Fig. 8,, represent that with XCOM reflection shows with common electrode 470, but, X represents here anti-phase though represent transmission display common electrode 442 with COM.
Here, the opposing party was in electronegative potential when so-called finger one side inverting each other was in noble potential, otherwise the opposing party is in the relation of noble potential when a side is in electronegative potential.Also can be a side the size of voltage amplitude and the opposing party's the varying in size of voltage amplitude.In addition, it is different with the center voltage of the opposing party's voltage amplitude also to can be a side the center voltage of voltage amplitude.
So, transmission display is shown that with the current potential of common electrode and reflection current potential with common electrode is made as the show state of the pairing transmission display of variation portion of the common current potential when independently of one another and inverting each other and the show state that reflects display part is presented at Fig. 9.Here, show that with the current potential of common electrode COM and as the reflection of the common electrode of reflection display part the current potential with common electrode XCOM becomes inverting each other as the transmission display of the common electrode of transmission display portion.Signal of video signal provides identical signal to transmission display portion and reflection display part.
For example above-mentioned described, set transmission display portion 12 for and be normal apparent black liquid crystal indicator for normal whitening, reflection display part 14.Here, when transmission display is in electronegative potential (being COM-L) and pixel electrode current potential and is in noble potential with the current potential of common electrode COM,, become black the demonstration so be equivalent to the state of driving voltage conducting because liquid crystal applied voltages becomes big.At this moment, in the identical time, reflection shows that the current potential with common electrode XCOM is in noble potential (being XCOM-H).Therefore, because liquid crystal applied voltages diminishes, become black the demonstration so be equivalent to the state of driving voltage shutoff.Similarly, when the pixel electrode current potential was in electronegative potential, transmission display portion and reflection display part all became white demonstration.Even and when in the other time, being COM-H, XCOM-L, be too transmission display portion during for white the demonstration reflection display part also become white demonstration, transmission display portion during for black the demonstration reflection display part also become black the demonstration.
As above-mentioned, by making transmission display show with the current potential of common electrode independently of one another and inverting each other with reflection with the current potential of common electrode, and in the liquid crystal indicator that uses transverse electric field type of drive, can be between transmission display portion and reflection display part, produce the counter-rotating of demonstration and can carry out good demonstration.This external above-mentioned in, though show black situation and be illustrated for normal for normal whitening, reflection display part 414 at transmission display portion 412, but be that normal to show black, reflection display part 414 be also identical in the situation of normal whitening in transmission display portion 412.Below, at being illustrated according to the specific embodiment that this ultimate principle constituted.
(embodiment 2)
When transmission display portion was applied common current potential inverting each other with the reflection display part, the voltage that is applied to liquid crystal layer in each horizontal period can change, according to circumstances the possibility of influential display quality.Therefore, as long as two switch modules are set at a sub-pixel, in transmission display portion and reflection display part, also can pixel electrode is independent, and the voltage that is applied to liquid crystal layer can be with common current potential counter-rotating the time is set as more fixing.Fig. 7 is the figure that shows this state.Below, enclose identical symbol and omit detailed explanation with Fig. 4 key element that extremely key element illustrated in fig. 9 is identical, and use the symbol of Fig. 4 to Fig. 9 to be illustrated.Here, a gate line 429 is provided with two switch modules 423,425, one side's switch module 423 is used for transmission display portion 412, the output terminal of switch module 423 is connected to transmission display common electrode 442 via the electric capacity TC of transmission display portion 412, the opposing party's switch module 425 is used to reflect display part 414, and the output terminal of switch module 425 is via the maintenance electric capacity RC of reflection display part 414 SCShow with keeping capacitance electrode 441 and be connected to reflection, in addition also via liquid crystal capacitance RC LCAnd the reflection that is connected to subtend substrate 60 shows with common electrode 470.
Figure 11 formation structural drawing that to be expression show about the driving of the liquid crystal indicator that is provided with the switch module that switch module that transmission display portion uses and reflection display part use at a sub-pixel.Below, the key element identical with the key element of explanation among Fig. 4 to the 10 enclosed identical symbol and omitted detailed explanation, and uses the symbol of Fig. 4 to Figure 10 to illustrate.Here show, be respectively arranged with the switch module 423 of transmission display portion 412 usefulness and the switch module 425 of reflection display part 414 usefulness at each sub-pixel, and the transmission display that will be used for transmission display portion 412 at each bar gate line 429 respectively with common electrode 442 and the reflection that is used to reflect display part 414 show with maintenance capacitance electrode 441 and be drawn out to the outside of viewing area 480, and guide to the apperance of common electrode control circuit 488.
Then, the transmission display of each bar gate line is connected to each other outside viewing area 480 with common electrode 442, and as transmission display common electrode terminal 490.Similarly, each bar gate line reflects demonstration and is connected to each other outside viewing area 480 with maintenance capacitance electrode 441, and as reflection demonstration maintenance capacitance electrode terminal 491.In Figure 11, represent transmission display common electrode terminal 490 with TCOM, represent that with RCOM reflection shows with keeping capacitance electrode terminal 491.Though these all have the title of " terminal ", can only be the state that connects also.
In addition, the reflection demonstration is drawn out to outside the viewing area 480 too with common electrode 470, is connected to component substrate 420 sides by being expressed as reflecting the contact mat (contact pad) that shows with common electrode contact point 489.Particularly, as shown in figure 11, reflection shows with keeping capacitance electrode terminal 491 to show with reflection and is connected with common electrode 470.
Figure 12 is the sequential chart in the formation of Figure 11.In Figure 12, show that the variation and the transmission display of the current potential of each bar gate line used the current potential of common electrode terminal TCOM and reflected the variation that shows with the current potential of common electrode terminal RCOM.Below, enclose identical symbol and omit detailed explanation with Fig. 4 key element that extremely key element illustrated in fig. 11 is identical, and use the symbol of Fig. 4 to Figure 11 to illustrate.
By showing that the current potential with common electrode terminal TCOM shows that with reflection the current potential with common electrode terminal RCOM becomes one group, changes in each horizontal period.Then, make the current potential counter-rotating in for example during selecting signal to be about to input to " Gate N " loop line before, selecting also to make its current potential keep the time of a horizontal period after the signal input.In addition, this transmission display of group shows with the current potential of common electrode terminal RCOM inverting each other with the current potential of common electrode terminal TCOM with reflection.
In addition, signal of video signal is according to the grid selection and in each horizontal period reversed polarity.For example select " Gate N ", and input negative polarity signal of video signal is to the transmission display portion corresponding with this gate line.At this moment, because the common electrode current potential becomes anti-phasely,, pairing reflection display part writes positive polarity so becoming.Then, when selecting " Gate N+1 ", input positive polarity signal of video signal is to the transmission display portion corresponding with this gate line.At this moment, because the common electrode current potential becomes anti-phasely,, pairing reflection display part writes negative polarity so becoming.
In this sequential chart, because 488 actions of common electrode control circuit, so can carry out H line inversion driving, and between transmission display portion 412 and reflection display part 414, do not produce the counter-rotating that shows, and can carry out good demonstration.
(embodiment 3)
Figure 13 to Figure 14 is to use the sectional view and the planimetric map of the liquid crystal indicator 510 that Figure 10 constitutes respectively.Below, enclose identical symbol and omit detailed explanation with Fig. 4 key element that extremely key element illustrated in fig. 12 is identical, and use the symbol of Fig. 4 to Figure 12 to illustrate.Figure 13 is the sectional view of sub-pixel part of liquid crystal indicator 510, and corresponding diagram 4.Here, be provided with two switch modules 423,425 for a sub-pixel.Switch module 423 is to use the switch module in transmission display portion 412, and switch module 425 is to use the switch module at reflection display part 414.
Because this liquid crystal indicator 510 other formation except component substrate 520 is all identical with the described content of Fig. 4, so the formation of following illustrated components substrate 520.On component substrate 520, pile up a plurality of films that are patterned into sandwich construction.In the example of Figure 13, be formed with glass substrate 422, semiconductor layer 424, gate insulating film 426, gate electrode 428, interlayer dielectric 430, source/drain electrodes 433,435, dielectric film 434, first nesa coating 436,441, FFS dielectric film 440, reflecting electrode 438 and second nesa coating 442,444 in proper order from 416 sides backlight towards liquid crystal layer 450 sides.Because these materials, specification, formation method etc. can use known material, specification, formation method etc. to be used as the manufacture method of general drive matrix type liquid crystal, so omit detailed explanation.
Here, first nesa coating 436,441 is separated with reflection display part 414 in transmission display portion 412.And, in transmission display portion 412, have function as the pixel electrode in the FFS mode 436, in reflection display part 414, have as the reflection demonstration function that keeps capacitance electrode 441 in the vertical electric field driven mode.
Second nesa coating 442,444 is separated with reflection display part 414 in transmission display portion 412.And, in transmission display portion 412, have function as the common electrode in the FFS mode 442, in reflection display part 414, have function as the pixel electrode 444 in the vertical electric field driven mode.
Therefore, as with transmission display portion 412 in the formation that correlates of FFS mode, formed first nesa coating 436 becomes pixel electrode 436 on dielectric film 434, and second nesa coating 442 that is disposed across FFS dielectric film 440 on first nesa coating 436 then becomes common electrode 442.At common electrode 442 slit 443 is set, and between common electrode 442 and pixel electrode 436, applies electric field, and drive liquid crystal layer 450 with lateral electric field type by this electric field by this slit 443.
On the other hand, as formation about the vertical electric field driven mode in the reflection display part 414, formed first nesa coating 441 becomes the reflection demonstration with keeping capacitance electrode 441 on dielectric film 434, and second nesa coating 444 that is disposed across FFS dielectric film 440 on first nesa coating 441 becomes pixel electrode 444.Then, configuration reflecting electrode 438.Reflecting electrode 438 just forms after forming first nesa coating 441 and FFS dielectric film 440, and becomes the formation that is connected with second nesa coating 444 that forms afterwards.Reflecting electrode 438 has in order to will be from the light of the subtend substrate 460 sides conductive reflecting film of the function of reflected back subtend substrate 460 sides once more.In addition, reflection show with keep capacitance electrode 441 and pixel electrode 444 across FFS dielectric film 440, and have the function of formation in order to the maintenance electric capacity that drives liquid crystal layer 450.Here, also identical with Fig. 4, the diagram of omission alignment film.
Figure 14 is in order to show the planimetric map of concrete formation.Here, show to be formed with two switch modules 423,425, and form two pixel electrodes, common electrode and the reflection corresponding and show apperance with the maintenance capacitance electrode with two switch modules 423,425.Figure 14 (a) shows two switch modules 423,425 that the corresponding transmission display of difference portion 412 forms with reflection display part 414, and after forming the source/drain electrodes 433,435 corresponding with switch module 423,425, the apperance after these electrodes offer two contact holes etc.Figure 14 (b) shows and first nesa coating 436,441 to be shown with maintenance capacitance electrode 441 as the reflection of the pixel electrode 436 of transmission display portion 412, reflection display part 414 forms, and after form the apperance of reflecting electrode 438.Figure 14 (c) shows second nesa coating 442,444 as the pixel electrode 444 of the common electrode 442 of transmission display portion 412, reflection display part 414 and the apperance after forming.
Here, shown in Figure 14 (b), the reflection of reflection display part 414 shows with keeping capacitance electrode 441 to be drawn out to the outside of viewing area, and similarly shown in Figure 14 (c), the common electrode 442 of transmission display portion 412 is drawn out to the outside of viewing area 480, and as illustrated in fig. 11, in the common electrode control circuit 488 in the outside of viewing area 480, make predetermined connection.
The variation of Figure 14 (c) is presented at Figure 15.As the nesa coating that uses at common electrode and pixel electrode, though use ITO (indium tin oxide) or IZO (indium-zinc oxide), but generally speaking because the resistance height of ITO and IZO, so when common electrode is drawn out to the outside of viewing area, have its resistance value can become the possibility of problem.With respect to this, to compare with ITO, IZO, reflecting electrode uses aluminium, aluminium alloy or silver etc., and resistance value can be lower.Therefore, also can use reflecting electrode to reduce the resistance of common electrode.
Figure 15 is presented at and disposes in the transmission display portion 412 with reflecting electrode is the apperance of pulling out line 447 of same material.Thus, can reduce common electrode 442 is drawn out to the viewing area resistance in when outside.
(embodiment 4)
Figure 16 and Figure 17 are sectional view and the planimetric maps that is respectively an other example of the liquid crystal indicator 510 that uses the formation that Figure 10 is arranged.Below, enclose identical symbol and omit detailed explanation with Fig. 4 key element that extremely key element illustrated in fig. 15 is identical, and use the symbol of Fig. 4 to Figure 15 to illustrate.The sectional view of sub-pixel part of the relevant liquid crystal indicator 511 of Figure 16, and corresponding Figure 13.Here also identical with the explanation of Figure 13, be provided with switch module 423 that is used for transmission display portion 412 and the switch module 425 that is used to reflect display part 414 at a sub-pixel.
This liquid crystal indicator 511 is in the configuration of first nesa coating of component substrate 521 and second nesa coating and to utilize method different with liquid crystal indicator illustrated in fig. 13 510.Because other formation is identical with content illustrated in fig. 13, so the formation of following illustrated components substrate 521.On component substrate 521, pile up a plurality of films that are patterned to multi-ply construction.In the example of Figure 16, be formed with glass substrate 422, semiconductor layer 424, gate insulating film 426, gate electrode 428, interlayer dielectric 430, source/drain electrodes 433,435, dielectric film 434, first nesa coating 442,441, FFS dielectric film 440, reflecting electrode 438 and second nesa coating 436,444 in regular turn from 416 sides backlight to liquid crystal layer 450 sides.Because these materials, specification, formation method etc. can use known material, specification, formation method etc. to be used as the manufacture method of general drive matrix type liquid crystal, so omit detailed explanation.
Here, first nesa coating 442,441 is separated with reflection display part 414 in transmission display portion 412.That is, in transmission display portion 412, have function, in reflection display part 414, then have as the reflection demonstration function that keeps capacitance electrode 441 in the vertical electric field driven mode as the common electrode in the FFS mode 442.
Though second nesa coating is separated with reflection display part 414 in transmission display portion 412, but any one all can use as pixel electrode 436,444.That is, in transmission display portion 412, have function, in reflection display part 414, have function as the pixel electrode 444 in the vertical electric field driven mode as the pixel electrode in the FFS mode 436.
Therefore, as with transmission display portion 412 in the formation that correlates of FFS mode, formed first nesa coating 442 becomes common electrode 442 on dielectric film 434, and second nesa coating 436 that is disposed across FFS dielectric film 440 on first nesa coating 442 then becomes pixel electrode 436.At pixel electrode 436 slit is set, and between common electrode 442 and pixel electrode 436, applies electric field, and drive liquid crystal layer 450 with lateral electric field type by this electric field by this slit.
On the other hand, as formation about the vertical electric field driven mode in the reflection display part 414, formed first nesa coating 441 becomes the reflection demonstration with keeping capacitance electrode 441 on dielectric film 434, and second nesa coating 444 that is disposed across FFS dielectric film 440 on first nesa coating 441 becomes pixel electrode 444.Then, configuration reflecting electrode 438.Reflecting electrode 438 just forms after forming first nesa coating 441 and FFS dielectric film 440, and becomes the formation that is connected with second nesa coating 444 that forms afterwards.Reflecting electrode 438 has in order to will be from the light of the subtend substrate 460 sides conductive reflecting film of the function of reflected back subtend substrate 460 sides once more.In addition, reflection shows with keeping capacitance electrode 441 and pixel electrode 444 to have, at it among both across FFS dielectric film 440, form function in order to the maintenance electric capacity of driving liquid crystal layer 450.Here, also identical with Figure 10, the diagram of omission alignment film.
Figure 17 shows the concrete planimetric map that constitutes, and corresponding Figure 14 (b), (c), and is described identical with Figure 14 (a), show to form two switch modules 423,425, and corresponding switch module 423,425 forms the apperance of two pixel electrodes and two common electrodes.Figure 17 (a) shows that first nesa coating 442,441 shows with maintenance capacitance electrode 441 as the reflection of the common electrode 442 of transmission display portion 412 and reflection display part 414 and forms, and after apperance after forming reflecting electrode 438.Figure 17 (b) shows that second nesa coating 436,444 is as the pixel electrode 444 of the pixel electrode 436 of transmission display portion 412 and reflection display part 414 and the apperance after forming.
Here, shown in Figure 17 (b), the common electrode 442 of transmission display portion 412 shows with keeping capacitance electrode 441 all to be drawn out to the outside of viewing area 480 with the reflection of reflection display part 414, illustrated as Fig. 8, in the common electrode control circuit 488 in 480 outsides, viewing area, make predetermined connection.
(embodiment 5)
In the situation of embodiment 4, at each horizontal period counter-rotating common electrode current potential.Therefore, along with each horizontal period shortens, the influence of rise time and fall time when counter-rotating occurring easily.Therefore, because this problem also is common problem in the driving method of general liquid crystal indicator, so motion for example have will the gate line of viewing area Nei Gelie independently common electrode wire give outside the viewing area that even lines is connected to each other, odd lines is connected to each other, and import the method (for example TOHKEMY 2001-356356 communique) of the common electrode electric potential signal of counter-rotating during each is vertical respectively.Here, even lines common electrode current potential connected to one another and odd lines common electrode current potential connected to one another are inverting each other.Then, as above-mentioned, the common electrode current potential be reversed in each vertical during (being each picture scanning) carry out.Here, what is called independently the common electrode distribution refer at each pixel distribution independently.
Figure 18 is the figure that represents above-mentioned motion is altered to the formation that is applicable to liquid crystal indicator, and corresponding Figure 11.Below, enclose identical symbol with Fig. 4 key element that extremely key element illustrated in fig. 17 is identical, and use the symbol of Fig. 4 to Figure 17 to illustrate.Here, the reflection that shows the odd-numbered line of gate line 429 shows that 480 the outside is connected to each other and as the first common electrode terminal 494 in the viewing area with common electrode 442 with the transmission display that keeps capacitance electrode 441 and even number line, and the reflection of the even number line of gate line 429 shows that 480 the outside is connected to each other and as the apperance of the second common electrode terminal 495 in the viewing area with common electrode 442 with the transmission display of maintenance capacitance electrode 441 and odd-numbered line.
In the situation of Figure 18, identical with Figure 11, at each bar gate line 429, the transmission display that is used for transmission display portion 412 shows with maintenance capacitance electrode 441 with the reflection that is used to reflect display part 414 with common electrode 442 and is drawn out to the outside of viewing area 480 respectively, and guides to common electrode control circuit 492.In the situation of Figure 18, because above-mentioned even number and odd number are relativity, be connected to each other with common electrode 442 so the reflection of the first common electrode terminal 494 and the 1st row, the 3rd row, the 5th row etc. shows with the transmission display that keeps capacitance electrode 441 and the 2nd row, the 4th row, the 6th row etc., and the reflection of the second common electrode terminal 495 and the 2nd row, the 4th row, the 6th row etc. show with maintenance capacitance electrode 441 and the 1st be listed as, the 3rd be listed as, the 5th transmission display that is listed as etc. is connected to each other with common electrode 442.In addition, represent the first common electrode terminal 494 with COM among Figure 18, represent the second common electrode terminal 495 with XCOM.
In addition, the reflection demonstration is drawn out to respectively outside the viewing area 480 with corresponding too each the bar gate line 429 of common electrode 470, and the corresponding aforementioned first common electrode terminal 494 and the second common electrode terminal 495, pool first reflection corresponding and show with common electrode terminal 471 and with corresponding second reflection of the gate line 429 of even number line and show, and be connected to component substrate 420 sides with common electrode contact point 496,497 shown contact mats by showing with reflection with common electrode terminal 473 with the gate line 429 of odd-numbered line.Particularly as shown in figure 18, first reflection shows that being connected to 494, the second reflection demonstrations of the first common electrode terminal with common electrode terminal 471 is connected to the second common electrode terminal 495 with common electrode terminal 473.
Figure 19 is the sequential chart during Figure 18 constitutes, and corresponding Figure 12.In Figure 19, show the variation of the current potential of the current potential of the variation of current potential of each bar gate line and the first common electrode terminal COM and the second common electrode terminal XCOM.Below, enclose identical symbol and omit detailed explanation with Fig. 4 key element that extremely key element illustrated in fig. 18 is identical, and use the symbol of Fig. 4 to Figure 18 to illustrate.
The current potential of the current potential of the first common electrode terminal COM and the second common electrode terminal XCOM becomes one group, and (being each picture scanning) changes during each is vertical.Then, make the current potential counter-rotating, the time during also making its current potential maintenance one vertically after the input of selection signal in for example during the selection signal is about to input to " Gate 1 " loop line before.In addition, the current potential of the current potential of this first common electrode terminal COM of group and the second common electrode terminal XCOM is inverting each other.
In addition, signal of video signal is according to the grid selection and in each horizontal period reversed polarity.For example be set as selection " Gate 1 ", and input negative polarity signal of video signal is to the transmission display portion corresponding with this gate line.At this moment, because the common electrode current potential becomes anti-phasely,, pairing reflection display part writes positive polarity so becoming.Then, when selecting " Gate 2 ", input positive polarity signal of video signal is to the transmission display portion corresponding with this gate line.At this moment, because the common electrode current potential becomes anti-phasely,, pairing reflection display part writes negative polarity so becoming.
In this sequential chart, 492 actions of common electrode control circuit, thus can carry out H line inversion driving, and between transmission display portion 412 and reflection display part 414, do not produce the counter-rotating that shows, and can carry out good demonstration.

Claims (11)

1. liquid crystal indicator, liquid crystal is seized on both sides by the arms between first substrate and second substrate, in a pixel, have the portion that sees through that carries out transmission display and reflect the reflecting part of demonstration, and possess and have: possess first electrode and second electrode above-mentioned first substrate, and drive the driving circuit of above-mentioned pixel, this liquid crystal indicator is characterised in that:
Across above-mentioned liquid crystal and possess third electrode with above-mentioned second substrate of the above-mentioned first substrate subtend;
Above-mentioned first electrode is arranged at the above-mentioned portion that sees through with above-mentioned second electrode, and first electrode also also is arranged at above-mentioned reflecting part with above-mentioned third electrode on the other hand;
Above-mentioned driving circuit is set to apply independently current potential in above-mentioned second electrode and above-mentioned third electrode.
2. liquid crystal indicator according to claim 1 is characterized in that,
When applying shutoff voltage between above-mentioned first electrode and above-mentioned second electrode time in the above-mentioned portion that sees through, apply forward voltage between above-mentioned first electrode and above-mentioned third electrode at above-mentioned reflecting part, the above-mentioned LCD alignment that makes above-mentioned reflecting part is for roughly being orthogonal to above-mentioned third electrode, makes above-mentionedly seeing through portion and above-mentioned reflecting part shows for showing slinkingly simultaneously.
3. liquid crystal indicator according to claim 1 and 2 is characterized in that,
When applying shutoff voltage at above-mentioned reflecting part between above-mentioned first electrode and above-mentioned third electrode the time, apply forward voltage between above-mentioned first electrode and above-mentioned second electrode, make the above-mentioned above-mentioned LCD alignment that sees through portion be the twisting states around the normal of above-mentioned second electrode, making the above-mentioned portion that sees through is bright demonstration with above-mentioned reflecting part simultaneously.
4. a liquid crystal indicator is seized liquid crystal on both sides by the arms between first substrate and second substrate, has to carry out seeing through portion and reflecting the reflecting part of demonstration of transmission display in a pixel, and this liquid crystal indicator is characterised in that:
Above-mentioned first substrate has: many data lines, many gate lines; A plurality of switch modules dispose respectively corresponding to each infall of above-mentioned data line and above-mentioned gate line; A plurality of first electrodes are connected to each output terminals of above-mentioned a plurality of switch modules; And second electrode, be used between itself and above-mentioned first electrode, applying electric field to drive liquid crystal molecule;
Above-mentioned second substrate has: third electrode is used for applying electric field to drive liquid crystal molecule between itself and above-mentioned first electrode;
The current potential of above-mentioned second electrode and the current potential of above-mentioned third electrode are inverting each other.
5. liquid crystal indicator according to claim 4, it is characterized in that, comprise control circuit, make with the current potential and the above-mentioned third electrode of common above-mentioned second electrode of above-mentioned gate line inverting each other, make the current potential counter-rotating in during the loop line before the selection signal is about to import this gate line, the time during also making its current potential maintenance one vertically after the input of selection signal.
6. a semitransparent liquid crystal display is seized liquid crystal on both sides by the arms between first substrate and second substrate, has to carry out seeing through portion and reflecting the reflecting part of demonstration of transmission display in a pixel, and this semitransparent liquid crystal display is characterised in that:
Above-mentioned first substrate has: many data lines, many gate lines; A plurality of switch modules are distinguished corresponding and paired configuration with each infall of above-mentioned data line and above-mentioned gate line; First electrode is arranged at respectively, is connected to the above-mentioned reflecting part and the above-mentioned portion that sees through of each output terminal of above-mentioned pair of switches assembly; And a plurality of second electrodes, between itself and above-mentioned first electrode, be applied with electric field and make above-mentioned liquid crystal drive;
Above-mentioned subtend substrate has: third electrode is used for applying electric field to drive above-mentioned liquid crystal between itself and above-mentioned first electrode;
The current potential of above-mentioned second electrode and the current potential of above-mentioned third electrode are inverting each other.
7. liquid crystal indicator according to claim 6 is characterized in that, the above-mentioned third electrode of each above-mentioned gate line is connected to each other with the common electrode terminal as the reflection demonstration in the outside of viewing area; Above-mentioned second electrode of each above-mentioned gate line is connected to each other with the common electrode terminal as transmission display in the outside of viewing area; Above-mentioned reflection shows the current potential of usefulness common electrode terminal and the current potential that above-mentioned transmission display is used the common electrode terminal is inverting each other and current potential reverses in each horizontal period.
8. liquid crystal indicator according to claim 6 is characterized in that, above-mentioned second electrode of the above-mentioned third electrode of the odd-numbered line of above-mentioned gate line and even number line is connected to each other as the first common electrode terminal in the outside of viewing area; Above-mentioned second electrode of the above-mentioned third electrode of the even number line of above-mentioned gate line and odd-numbered line is connected to each other as the second common electrode terminal in the outside of viewing area; Inverting each other and the current potential of the current potential of the current potential of the above-mentioned first common electrode terminal and the above-mentioned second common electrode terminal is in each picture scanning counter-rotating.
9. according to claim 7 or 8 described liquid crystal indicators, it is characterized in that above-mentioned first substrate is arranged at above-mentioned reflecting part, and have the reflection demonstration with keeping electric capacity.
10. liquid crystal indicator according to claim 9 is characterized in that, above-mentioned reflection show with maintenance electric capacity have be used for its with above-mentioned first electrode between form the reflection that keeps electric capacity and show and use the maintenance capacitance electrode; Above-mentioned reflection shows with the current potential that keeps capacitance electrode identical with the current potential of common electrode terminal with above-mentioned reflection demonstration.
11. it is characterized in that according to each described liquid crystal indicator in the claim 1 to 10 thickness setting of above-mentioned liquid crystal is that to make the phase differential of reflecting part be that Δ nd=λ/4, the above-mentioned phase differential that sees through portion are Δ nd=λ/2.
CN 200710153437 2006-09-19 2007-09-19 Liquid crystal display device Expired - Fee Related CN101149540B (en)

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WO2009109122A1 (en) * 2008-03-04 2009-09-11 上海天马微电子有限公司 Transflective liquid crystal display device
US8482501B2 (en) 2008-03-04 2013-07-09 Shanghai Tianma Micro-electronics Co., Ltd. Liquid crystal display device with controllable viewing angle and driving method thereof
CN103226270A (en) * 2013-05-03 2013-07-31 合肥京东方光电科技有限公司 Half-transmission half-reflection liquid crystal display panel, display device and array substrate
CN104062809A (en) * 2013-03-22 2014-09-24 刘鸿达 Dual-display mode liquid crystal display
US9341872B2 (en) 2008-03-04 2016-05-17 Shanghai Tianma Micro-electronics Co., Ltd. Liquid crystal display device with controllable viewing angle and driving method thereof
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WO2009109122A1 (en) * 2008-03-04 2009-09-11 上海天马微电子有限公司 Transflective liquid crystal display device
US8400386B2 (en) 2008-03-04 2013-03-19 Shanghai Tianma Micro-electronics Co., Ltd. Transflective liquid crystal display device
US8482501B2 (en) 2008-03-04 2013-07-09 Shanghai Tianma Micro-electronics Co., Ltd. Liquid crystal display device with controllable viewing angle and driving method thereof
US9341872B2 (en) 2008-03-04 2016-05-17 Shanghai Tianma Micro-electronics Co., Ltd. Liquid crystal display device with controllable viewing angle and driving method thereof
CN104062809A (en) * 2013-03-22 2014-09-24 刘鸿达 Dual-display mode liquid crystal display
CN104062809B (en) * 2013-03-22 2017-08-08 刘鸿达 Dual display mode LCD
CN103226270A (en) * 2013-05-03 2013-07-31 合肥京东方光电科技有限公司 Half-transmission half-reflection liquid crystal display panel, display device and array substrate
WO2014176886A1 (en) * 2013-05-03 2014-11-06 合肥京东方光电科技有限公司 Transflective liquid crystal display panel, display device and array substrate
US9983433B2 (en) 2013-05-03 2018-05-29 Hefei Boe Optoelectronics Technology Co., Ltd. Transflective liquid crystal display panel comprising a phase retardation film between an over coater and a common electrode
CN108780628A (en) * 2016-03-16 2018-11-09 夏普株式会社 Liquid crystal display device and its driving method
US10796650B2 (en) 2016-03-16 2020-10-06 Sharp Kabushiki Kaisha Liquid crystal display device and driving method therefor
TWI708101B (en) * 2019-07-05 2020-10-21 友達光電股份有限公司 Pixel structure and display device

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