[go: up one dir, main page]

WO1998008134A1 - Dispositif d'affichage a cristaux liquides - Google Patents

Dispositif d'affichage a cristaux liquides Download PDF

Info

Publication number
WO1998008134A1
WO1998008134A1 PCT/JP1997/002862 JP9702862W WO9808134A1 WO 1998008134 A1 WO1998008134 A1 WO 1998008134A1 JP 9702862 W JP9702862 W JP 9702862W WO 9808134 A1 WO9808134 A1 WO 9808134A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
signal wiring
electrode
video signal
display device
Prior art date
Application number
PCT/JP1997/002862
Other languages
English (en)
Japanese (ja)
Inventor
Naoto Hirota
Original Assignee
Obayashiseikou Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=17518813&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1998008134(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Obayashiseikou Co., Ltd. filed Critical Obayashiseikou Co., Ltd.
Publication of WO1998008134A1 publication Critical patent/WO1998008134A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Definitions

  • the present invention relates to a large screen active matrix type liquid crystal display device having a wide viewing angle and high image quality.
  • a method of applying an electric field to a liquid crystal composition layer using a pair of comb electrodes formed on one substrate of a conventional active matrix type liquid crystal display device is disclosed in, for example, JP-A-7-36058 and JP-A-7-159786.
  • a display method proposed in Japanese Patent Application Laid-Open No. 6-160878 is referred to as a horizontal electric field method, even if the main electric field applied to the liquid crystal composition layer is in a direction substantially parallel to the substrate interface.
  • Fig. 1 and Fig. 2 show examples of the conventional lateral electric field method.
  • the liquid crystal drive electrode (2) which is a comb-shaped pixel electrode, and the common electrode (3) are linearly arranged in parallel, and the distance between the electrodes (3) and (4) The separations a are all the same.
  • the transmittance characteristics of the electric field type liquid crystal cell with respect to the driving voltage are as follows. When a voltage higher than the voltage shown in ':) is applied, the brightness decreases: The video signal voltage seems to be slightly too high. In such a case, the gradation of the image is inverted. ⁇ In the gradation display characteristics, this gradation inversion is a very big problem, resulting in an extremely unnatural image display.
  • liquid crystal driving voltage tends to be higher than that in a conventional vertical electric field type ⁇ crystal display device.
  • C also required high-voltage output, resulting in high costs.
  • the alignment film and the liquid crystal used in the horizontal electric field type liquid crystal display device must be combined with a fringe angle of 1 degree or less, which is around 4 to 7 degrees used in the conventional TN liquid crystal display device. Alignment film cannot be used. For this reason, if a horizontal electric field type liquid crystal display device is to be manufactured on a conventional T : liquid crystal display device production line, it is necessary to change the material of the alignment mask and the liquid crystal material, resulting in lower production efficiency.
  • the color filter substrate well, like the conventional ⁇ ⁇ ⁇ ⁇ liquid crystal display, Also, the color filter and substrate have a transparent conductive film on the entire surface, unlike conventional liquid crystal display devices, so they are susceptible to the effects of static electricity. There are two problems:
  • the present invention has been made to solve these problems, and an object of the present invention is to provide a horizontal electric field liquid crystal display device with no grayscale inversion, good viewing angle characteristics, a low-voltage driving IC, and a high response speed. Further, it is to increase the degree of freedom in selecting a usable liquid crystal composition and an alignment film material, and to improve the liquid crystal process (the yield is improved and the cost is reduced). Disclosure
  • the following means are formed on a substrate at each intersection of a scanning signal wiring, a video signal wiring, and the scanning signal wiring and a video signal wiring.
  • An active matrix substrate having a thin film transistor, a liquid crystal drive electrode connected to the thin film transistor, and a common electrode at least partially formed to face the liquid crystal drive electrode; and an active matrix substrate facing the active matrix substrate.
  • a counter substrate, and a liquid crystal display device comprising a liquid crystal layer sandwiched between the active matrix substrate and the counter substrate,
  • the distance between the liquid crystal drive electrode and the common electrode is two or more types within the pixel, and the distance between the electrodes is different from the center of the pixel as a boundary. Arranged symmetrically—
  • the common electrode is connected in the direction in which the video signal wiring extends, and within the effective display screen, the common electrode is not connected to each other across the video signal wiring.
  • Means 3 the common electrodes connected to the video signal wiring extending in all directions are separated into an odd group and an even group, and the odd group and the even group are shared according to the period of the scanning signal.
  • a voltage waveform having a phase opposite to that of the common electrode is applied to each of the electrodes, and a video signal waveform having a phase opposite to that of the common electrode is applied to each of the liquid crystal driving electrodes facing the common electrodes of the odd and even groups.
  • a liquid crystal display device characterized by a driving method.
  • L means 5j
  • the liquid crystal driving electrode and the scanning signal wiring and the power are obtained from the additional capacitance formed by overlapping the liquid crystal driving electrode and the common electrode via the insulating film;
  • the structure was such that the additional capacitance formed by being superposed through the insulating film was larger:
  • the structure is such that the video signal wiring and the pixel pole are bent at an angle of 1 ° to 1 ° with respect to the liquid crystal direction.
  • the scanning signal wiring and the pixel electrode are arranged so as to be bent at an angle of 1 ° to ⁇ 45 ° with respect to the liquid crystal alignment direction.
  • the video signal wiring and the pixel electrode are arranged so as to be bent in a range from 45 degrees to 135 degrees except 90 degrees with respect to the liquid crystal alignment direction.
  • an insulating film is used as an overcoat layer covering one layer of a power filter formed on a counter substrate, and a boundary between the R, G, and B power filters is formed.
  • a conductive or semiconductor electrode was formed as a black mask on the overcoat insulating film.
  • ⁇ Means 16> In Means 3, common electrodes connected in the direction in which the video signal wiring extends are separated into an odd group and an even group, and the power video signal wiring is divided into two vertically at the center of the screen. :
  • the scanning signal wires divided into two groups at the center of the surface are divided into upper and lower groups, and are simultaneously driven by the upper and lower groups.
  • video signal voltage waveforms of opposite phase to the group and applying the voltage waveform of the video signal wiring and the common electrode drive waveform of opposite phase to the odd and even groups of common electrodes.
  • BEST MODE FOR CARRYING OUT THE INVENTION A liquid crystal display device characterized by a driving method in which different video signals are written in two horizontal lines above and below a liquid crystal display device.
  • FIG. 1 and 2 when the distance between the liquid crystal drive electrode and the common electrode is not uniform in one pixel ⁇ , but is composed of a combination of two or more kinds of electrode distances, FIG. As shown in Fig. 3, even if the shortest distance between the electrodes is inverted, even if the grayscale inversion occurs at the widest distance between the electrodes, inversion occurs. As shown in Fig. 5, Fig. 8, Fig. 10, If the distance between the electrodes is symmetrical or symmetrical up and down from the center of the element, increase the distance between the electrodes closest to the scanning signal wiring and video signal wiring. The result is a uniform image with little crosstalk:
  • a 5 V drive video signal drive IC that can reduce the video signal drive voltage of the dot inversion drive method to less than half even in the horizontal electric field type liquid crystal display device can be used.
  • the dot inversion drive does not generate horizontal cross and vertical cross talk, so that good image quality can be obtained.
  • the common electrode connection part completely covers the TFT part, which prevents light from entering the F-cho, so the black mask on one side of the color filter is omitted. By eliminating the black mask on the CF side, the aperture ratio can be increased, the brightness can be increased, and the liquid crystal panel can be made.
  • the resistance value of the common electrode had to be reduced because it was driven with a voltage waveform of the opposite phase to that of the common electrode.There was no flexibility in the material._ The entire common electrode had a large area overlapping the video signal wiring, and the overall capacitance In order to avoid this, there is a problem that the power consumption increases when driving. There was a problem that the number of pull-out terminals increased—an increase in the number of pull-out terminals caused an increase in the number of drives 1 C, an increase in IC cost, and an increase in connection failures.
  • the capacitance formed by the scanning signal wiring and the liquid crystal driving electrode is determined by the capacitance formed by the common electrode and the liquid crystal driving electrode. For this reason, as shown in FIG. 41, the driving voltage amplitude V * of the scanning signal wiring can be reduced, so that the bias voltage applied to the TFT is also reduced and the characteristic shift of the TFT can be reduced.
  • TFT thin film transistor
  • the liquid crystal drive electrode can be formed simultaneously with the formation of the thin-film transistor (TI "T) (;," Since the method of (1) is used, the miniaturization and processing accuracy can be much improved compared to the conventional processing method using the etching method. As shown in FIGS. 42, 43, FIG. 57, and FIG.
  • TI "T thin-film transistor
  • FIGS. 42, 43, FIG. 57, and FIG. By forming the liquid crystal driving electrode at the same time as the drain electrode, the problem of poor contact between the drain electrode and the liquid crystal driving electrode does not occur, and the processing accuracy of the distance between the liquid crystal driving electrode and the common electrode increases. The occurrence of brightness unevenness is reduced over the entire screen.
  • Liquid crystal drive By processing both the electrode and the common electrode by dry etching, the distance between the electrodes can be reduced, and the liquid crystal drive voltage is reduced. It is possible to increase the response speed of the liquid crystal at the same time.
  • the liquid crystal molecules generate two kinds of rotational movements, left rotation and right rotation, inside the pixel electrode.
  • the viewing angle characteristic is shifted. Within a single pixel, two types of rotational movement of liquid crystal molecules, left rotation and right rotation, occur. In this case, even when the tilt angle is large, the characteristics of the viewing angle do not shift. Therefore, in the in-plane switching mode liquid crystal display device using the structure of the present invention, the tilt angle is not limited.
  • high resistance layer overcoat By using a layer, an inexpensive electrodeposition color filter can be used for the horizontal electric field type liquid crystal. Good flatness, no unevenness of the cell gear, It is possible to make cost cheap good liquid crystal panel of the scan door
  • the alignment film having a tilt angle of about 3 to 6 degrees which has been conventionally used in a liquid crystal display device of the vertical electric field type, to reduce the tilt angle to less than ⁇ degrees.
  • the viewing angle characteristics of a horizontal electric field type liquid crystal cell can be greatly improved by reducing the fringe tilt angle to 1 degree or less.
  • the alignment film used can be used without changing it, it can be used by simply inserting one of the V-irradiation device, ion infra- structure device, or plasma surface treatment device into the conventional liquid crystal cell production line. It is possible to create an electric field type liquid crystal display device, which can increase production efficiency and investment efficiency:
  • Fig. 5-1 and Fig. 55 by using masking processing, one pixel can be formed. , Two types of fret tilt angles It can be on the set Control of viewing angle characteristics is freed.
  • the scanning signal wiring can be lengthened twice, so that the electron transfer is slow.
  • Amorphous thin-film transistors can also be used sufficiently: even if the image is enlarged, the length of the video signal wiring is reduced to 1 /, and the number of intersections between the scanning signal wiring and the video signal wiring is reduced to i / 2. This eliminates the problem of the resistance of video signal wiring, that is, the use of conventional metal materials eliminates the need to change the process.
  • dot inversion drive can be introduced for ultra-high-definition display, and a low-voltage drive IC can be used, so that the cost is low and there is no display unevenness.
  • High quality images can be realized using amorphous silicon thin film transistors
  • FIGS. 4 and 5 are a cross-sectional view and a plan view of a unit pixel of the present invention.
  • the scanning signal wiring (gate electrode) 1 formed on ⁇ is preferably made of an anodizable metal such as A 1, but it is better to use r, Mo, Ti, W, Ta. ⁇ b
  • a two-layer structure or a three-layer structure of Cu having a low electric resistance value and the refractory metal is used in a super-large display device.
  • an amorphous silicon (a-Si) film is formed and used as an active active layer of the transistor: the video signal wiring 2 overlaps a part of the amorphous silicon.
  • Forming the drain electrode ⁇ In the case of Fig. 4, the drain electrode ⁇ and the liquid crystal drive electrode 4 are formed at the same time with the same metal material.
  • the common electrode 3 is formed: Matrix of the above unit pixels Active matrix: An alignment film made of a polyimide is formed on the surface of a substrate, and a rubbing treatment is performed on the surface. An opposite substrate having an alignment film formed on the surface is also rubbed. And a liquid crystal composition containing rod-shaped liquid crystal molecules ⁇ ⁇ ⁇ between the active matrix substrates, and polarizing plates 10 and ⁇ disposed on the outer surfaces of the two substrates:
  • the distance between the common electrode 3 and the liquid crystal drive electrode 4 has two types, a and b.
  • the distances a and b between the electrodes are arranged symmetrically. 8 and 10, the number of electrodes is increasing, and the distance between the electrodes is also a combination of a and b, and a, b, and c, as shown in Figs. 7, 9, and 1.
  • Combinations are considered to be symmetrical as in Figure 5, but symmetry is not always required:
  • Fig. 58 it can also be applied to the case where the distance between the common electrode 3 and the liquid crystal drive electrode 4 is set up and down.
  • the types of distance between the electrodes are a, b, and c. It is possible to introduce more than just three types.
  • _ In the case of Fig. 5, Fig. 6, Fig. 8, and Fig. 10, the liquid crystal molecules are easily affected by the electric field from the video signal wiring (2) Therefore, it is conventionally known that the crosstalk in the direction along the video signal wiring can be reduced by arranging the common electrode 3 so that ⁇ is sandwiched between them.
  • FIGS. 13 and 64 show unit pixels in which the common electrode is connected to the video signal wiring in the same direction and the common electrode is not connected to the video signal wiring across the video signal wiring inside the effective display screen.
  • the connection portion of the common electrode covers the upper part of the thin-film transistor.
  • the thin-film transistor semiconductor layer can be formed without a black mask (BM) on the color filter of the opposite substrate. Since no light penetrates, the leakage current does not increase when the thin film transistor is turned off.
  • FIGS. 18, 19, 20, 20, 21, 22, and 23 show these unit pixels as: Fig. 20, Fig. 22, and Fig. 23 show the pixel electrodes parallel to the scanning signal wiring, but the connection direction of the common electrode is the same as the video signal wiring. Has become:
  • the scanning signal wiring 1 and the common electrode 3 are short-circuited.
  • the cross-sectional structure as shown in Fig. 44 and Fig. 57 is required.
  • the common electrode is formed on the upper part of the substrate, and the protective insulating film below the common electrode and the upper insulating film ® are used.
  • an oxide-based insulating film or organic insulating film having a small dielectric constant can be used, so that an increase in load when driving the scanning signal wiring can be minimized (Example 3) FIGS.
  • FIG. 11 and 15 Is a plan view in which the common electrode connected in the same direction to the solid video signal wiring in Example 2 is connected and separated into an odd group and an even group outside the effective display screen.
  • FIG. One set of books.Three books can be considered as one set and connected and separated into an odd group and an even group.
  • Figure 59 is a plan view of the structural arrangement surrounding the entire effective display screen with the odd-numbered group connection electrodes @ and the even-numbered group connection electrodes, and the common connection electrodes, scanning signal wiring, and video signal wiring are static electricity. With this structure, the problem of static electricity failure in the liquid crystal self-process can be significantly reduced.
  • This figure shows a common electrode separated into an odd group and an even group. Each phase is reversed according to the period of the scanning signal.
  • the horizontal line inversion driving method as in the present invention has the advantage of reducing the horizontal crosstalk.
  • the video signal wiring driving circuit C can also reduce the signal amplitude and thus is inexpensive.
  • V-power IC can be used.
  • FIG. 12 Fig. 12, Fig. 43, Fig. 44, Fig. 57, Fig. 64, Fig. 65, Fig. 24 show that the thin film semiconductor layer is doped with impurities and activated to lower the resistance, and as a liquid crystal drive electrode 3A and 3B are a cross-sectional view and a plan view of a unit pixel according to an embodiment of the present invention:
  • a scanning signal wiring (gate electrode) 1 is formed on a glass substrate 2, and a gate insulating film 2 is formed so as to cover this. From this, an amorphous silicon film is formed, and a continuous insulation film ⁇ on the bath channel side is formed continuously without breaking the vacuum.
  • the amorphous silicon film at this time has a film thickness of about 300 A to 700 ⁇ ⁇ . About 2000A is enough for the insulation film. ⁇ Except for the back channel protective insulating film ®, the other part is etched with a hydrofluoric acid based etchant to expose the surface of the amorphous silicon film.
  • the PH 3 gas Phosphorus treatment may be used to adsorb phosphorus on the surface of the amorphous silicon layer, and then activate the melt diffusion of phosphorus when the silicon layer is melted by an excimer laser.
  • the exposed area becomes a low-resistance holographic silicon layer: After the positive resist is stripped, the thin film transistor source and drain electrodes 32 and the liquid crystal drive electrode ⁇ ⁇ are simultaneously dry-etched.
  • FIG. 9 is a drive voltage waveform diagram in which a video signal waveform having a phase opposite to that of the common electrode is applied to the liquid crystal drive electrodes facing the common electrodes of the odd-numbered group and the even-numbered group, respectively.
  • FIGS. 16 and 17 are polar diagrams showing how the video signal pressure is written to the pixels having the structural arrangements of FIGS. 14 and 15 of the present invention. It is divided into plus and minus based on the common electrode potential. Such a writing drive method is called a dot inversion drive method.
  • FIGS. 24, 27, and 29 show that the liquid crystal driving electrode 4 and the common electrode 3 scan with the liquid crystal driving electrode ⁇ more than the additional capacitance formed by superimposing the common electrode 3 via the insulating film.
  • FIG. 4 is a plan view of a unit pixel in a case where an additional capacitance 16 formed by overlapping a signal wiring 1 with an insulating film interposed therebetween is larger.
  • Figure 30, Figure 31, Figure 32, Figure 33, Figure 34, and Figure 35 are plan views in which these unit plane elements are arranged in a stripe or delta arrangement.
  • cross-sectional structures as shown in Figs. 12, 26, 28, 42, 44, 57, and 65.
  • a cross-sectional structure as shown in FIG. 66 may be used.
  • the overlapping area of the liquid crystal drive electrode and the common electrode should be as small as possible.
  • FIG. 41 is a timing chart of a scanning signal voltage waveform and a video signal voltage waveform for driving the in-plane switching mode liquid crystal display panel of the fourth embodiment.
  • the scanning signal has a quaternary waveform.
  • the common electrode potential is close to the median value of the video signal waveform and is fixed at the potential.
  • a coupling drive system is used.
  • a capacitance between pixel electrodes formed between a liquid crystal driving electrode and a common electrode via a liquid crystal composition is used.
  • the common electrode 3 is formed last, but this common electrode is also made of a material that can be processed by dry etching (such as high melting point metals such as Mo, Ti, Nb, Ta and their alloys or silicide compounds of these). As a result, it is possible to produce an in-plane switching liquid crystal display capable of high-speed response.
  • a material that can be processed by dry etching such as high melting point metals such as Mo, Ti, Nb, Ta and their alloys or silicide compounds of these.
  • FIG. 3 is a cross-sectional view of a case where molybdenum silicide is formed.
  • Fig. 57 after forming an amorphous silicon film doped with impurities by plasma CVD on the amorphous silicon film, the impurity amorphous silicon layer is changed to low-impurity polysilicon by excimer laser. It is sectional drawing at the time of changing to a layer.
  • Molybdenum silicide is also one of the dry etching materials. Similar silicide is formed by sputtering not only Mo but also other refractory metals.
  • Figs. 52, 19, 21, 31, and 33 show video signal wiring and pixel electrodes.
  • the liquid crystal drive electrode and part of the common electrode facing the liquid crystal drive electrode is a plan view of a structure in which the liquid crystal alignment direction is bent at an angle of ⁇ 1 ° to ⁇ 45 ° with respect to the liquid crystal alignment direction. is there.
  • the dielectric anisotropy of the liquid crystal molecules is positive.
  • Fig. 52 when a voltage is applied to the common electrode 3 and the liquid crystal drive electrode and an electric field is generated between the electrodes, the liquid crystal molecules ⁇ make two kinds of rotational movements, left rotation and right rotation, at the bent part. I do. Since two types of rotational movement are possible inside the unit pixel, the deviation of the viewing angle characteristic does not occur regardless of the magnitude of the pretilt angle. [Embodiment 8] Figs.
  • Figs. 53, 19, 21, 31, and 33 show that the video signal and the surface element force are bent in the range of 45 to 135 degrees, excluding 90 degrees, with respect to the liquid crystal alignment direction. It is a top view in the case of a structure.
  • the dielectric anisotropy of the liquid crystal molecules is negative.
  • Fig. 53 when a voltage is applied to the common electrode 3 and the liquid crystal drive electrode ⁇ ⁇ and an electric field is generated between the electrodes, the liquid crystal molecules ⁇ rotate left and right two ways around the bend. exercise. By allowing two types of rotational movement inside the unit pixel, the deviation of the viewing angle characteristics does not occur regardless of the magnitude of the pretilt angle.
  • FIG. 4 is a plan view of a structure bent in the range of FIG.
  • the dielectric anisotropy of liquid crystal molecules is negative.
  • two kinds of liquid crystal molecule rotational motions ie, left rotation and right rotation, occur inside the unit pixel. Regardless of the magnitude of the pretilt angle, the deviation of the viewing angle characteristics does not occur.
  • the rubbing treatment is performed so that the liquid crystal molecules at the interface with the upper and lower substrates are almost parallel to each other.
  • the polarizing axis (optical axis) of the polarizing plate is arranged so as to be substantially orthogonal at both the top and bottom, and a normally black mode in which light does not pass from the surface element when no electric field is applied is used.
  • the black mask used for these color filters has the same angle as the angle at which the video signal wiring and scanning signal wiring are bent, and a part of the BM is bent. There is a special feature in what you do.
  • FIGS. 45, 46, and 47 are cross-sectional views of a color filter and a substrate of an in-plane switching mode liquid crystal display device.
  • Color fill of R, G, B on glass substrate 11 Form a tar.
  • an organic or inorganic high-resistance material ( ⁇ ⁇ ⁇ ' ⁇ ⁇ ⁇ ⁇ ⁇ ' ⁇ ) is formed for flattening and preventing electrostatic charge during the liquid crystal process.
  • Fig. 56 in the horizontal electric field method, there is an experimental result that the voltage holding ratio hardly decreases even if the liquid crystal specific resistance decreases to about 10 9 ⁇ 'cm.
  • the transparent ITO is formed on the entire surface, and then the R, G, and B color filters are formed by the electrodeposition method.
  • the sum of the thickness of the high resistance material, the thickness of one color filter, and the thickness of the liquid crystal layer is required to be at least twice the distance between the liquid crystal drive electrode and the common electrode. If the total thickness is more than twice the distance between the electrodes, the electric field generated between the liquid crystal drive electrode and the common electrode will be affected by the transparent conductive film (ITO) 10 formed on the entire surface of the color filter. It is possible to generate a transverse electric field in a direction parallel to the substrate without receiving much.
  • FIGS. 48 and 49 are cross-sectional views of a color filter substrate of a liquid crystal display device of an in-plane switching mode.
  • Form R, G, B color filters on the glass substrate 1.
  • an organic or inorganic insulating film @ is formed for planarization. In this state, various problems occur due to static electricity generated in the liquid crystal process. Therefore, a black mask is formed on the insulating film @ to further discharge static electricity.
  • a transparent conductive electrode 10 is formed, the same pattern as that of the black mask may be used.
  • the lateral electric field type liquid crystal display device is affected by an electric field due to external static electricity. A major problem arises that it cannot be converted.
  • Fig. 67 there is a method of forming a transparent conductive film on the outside of the glass substrate on the color filter side. In this case, however, a high insulating filter layer or a flattening film is formed during the liquid crystal process. In some cases, the trapped static electricity cannot be removed while trapped, which causes poor alignment.
  • Example 13 As shown in Figs. 50 and 51, if the liquid crystal drive electrode and the common electrode are simply arranged in parallel, the viewing angle characteristic is deviated when the pretilt angle of the liquid crystal is large. Resulting in. Used for conventional vertical electric field type liquid crystal display devices In addition, since the pretilt angle of the alignment film is as large as 3 to 7 degrees, the viewing angle characteristic is inevitably deviated. Polyimide after orientation film firing a pre-tilt angle by using the same alignment layer as a way of reducing the 1 degree or less, and UV irradiation treatment, He, Ne, Ar, N 2, 0 2 gas, such as ionized ion implantation Processing methods have been developed.
  • FIG. 62 shows that, as in Embodiment 2, the common electrode is connected to the video signal wiring in the same direction, and within the effective display surface, the common electrode crosses the video signal wiring. Not connected to each other.
  • the common electrode is divided into an odd group and an even group, and the odd groups are connected to each other outside the effective display screen.
  • the difference from the second embodiment is that the video signal wiring is divided vertically into two at the center.
  • the terminals to be connected to the IC for driving the video signal wiring are also separated into two upper and lower parts, respectively, and the number of terminals is also doubled. If the number of scanning signal lines is greatly increased, as in GA for 0/8, the structure of this embodiment reduces the resistance of the video signal wiring and reduces the number of intersecting scanning signal lines. Is reduced by half, the coupling capacitance is reduced, and the driving load of the video signal wiring is greatly reduced.
  • FIG. 63 shows a drive voltage waveform for driving the in-plane switching mode liquid crystal display device having the structure according to the fourteenth embodiment.
  • Two scanning signal lines are operated simultaneously in the upper half area and the lower half area. Since the common electrode is connected in the upper half region and the lower half region, it is driven by a method in which the polarity is inverted in accordance with the driving cycle of the scanning signal wiring.
  • the common electrode is divided into an odd group and an even group. Opposite-phase voltages having different polarities are applied to the odd-numbered group and the even-numbered group, which are connected to the common connection electrodes @ and ⁇ , in reverse according to the period of the scanning signal wiring.
  • the video signal wiring is divided into an odd-numbered group and an even-numbered group, and signal voltages of opposite phases with different polarities are applied to the corresponding common electrodes of the odd-numbered group and the even-numbered group.
  • the odd-numbered and even-numbered video signal lines are divided into upper and lower halves, and different in-phase video signals are applied. This is a two-scan line simultaneous access dot inversion drive system.
  • a frame memory is provided, so it would be good to be able to extract image data for two run signal wirings from this frame memory at the same time.
  • the selection time of scanning signal wiring is reduced to 10 sec or less if the conventional one-scan signal wiring access method is used.
  • the driving capability of the amorphous silicon thin film transistor is approached, and the video signal voltage cannot be accurately transmitted to the liquid crystal driving electrode.
  • the simultaneous scanning dot inversion drive method of the present invention the selection time is twice as long as that of the conventional method, so that a sufficient video signal writing time can be secured even with an amorphous silicon thin film transistor. Also greatly expands the degree of freedom Industrial applicability
  • an inexpensive 5 VIC can be used for the video signal drive IC, and a conventional liquid crystal member can be used, so that an inexpensive and highly reliable image display device can be provided.
  • an ultra-high-definition large-screen liquid crystal display can be realized using amorphous silicon thin film transistors ⁇ [Explanation of symbols]
  • A-- The angle at which the alignment direction of the P-type liquid crystal molecules intersects the pixel electrode (common electrode and liquid crystal drive electrode)

Landscapes

  • Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)
  • Nonlinear Science (AREA)
  • Geometry (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Cette invention concerne un dispositif d'affichage à cristaux liquide et à matrice active d'un système à champ électrique latéral, lequel permet d'obtenir des images qui possèdent une excellente capacité de spécification de l'angle de visibilité, et qui ne comportent pas d'images résiduelles, d'inversion de gradation, de papillotements ni d'interférences vidéo. Le dispositif décrit dans cette invention est conçu de manière à ce que les éléments d'image à afficher soient disposés sur un substrat, ces éléments se composant de lignes de signaux de balayage (1), de lignes de signaux vidéo (2), d'électrodes d'éléments d'images (3, 4) et d'éléments actifs (T). Un film à orientation par cristaux liquides est formé directement sur le substrat ou sur un film isolant intermédiaire. Le substrat est ensuite disposé face à un substrat de type filtre couleur qui supporte un autre film à orientation par cristaux liquides, ceci de manière maintenir une couche de cristaux liquides entre lesdits substrats. Les électrodes (1, 2, 3, 4) et l'élément actif (T) sont disposés de manière à ce qu'un champ électrique sensiblement parallèle aux substrats puisse être appliqué sur la couche de cristaux liquides. Les électrodes (1, 2, 3, 4) et l'élément (T) sont connectés à un système de commande externe, qui va gérer de manière arbitraire le champ électrique appliqué en fonction d'un diagramme d'affichage, ainsi qu'à un système de polarisation. Ce dernier va modifier les caractéristiques optiques des cristaux liquides en fonction de l'état orienté des cristaux. Les distances (a) et (b), qui séparent les électrodes de commande (3) des cristaux liquides et les électrodes communes (4), diffèrent l'une de l'autre.
PCT/JP1997/002862 1996-08-19 1997-08-18 Dispositif d'affichage a cristaux liquides WO1998008134A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/272792 1996-08-19
JP27279296A JP3567183B2 (ja) 1996-08-19 1996-08-19 液晶表示装置

Publications (1)

Publication Number Publication Date
WO1998008134A1 true WO1998008134A1 (fr) 1998-02-26

Family

ID=17518813

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/002862 WO1998008134A1 (fr) 1996-08-19 1997-08-18 Dispositif d'affichage a cristaux liquides

Country Status (3)

Country Link
JP (1) JP3567183B2 (fr)
TW (1) TW406206B (fr)
WO (1) WO1998008134A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2870947A1 (fr) * 2004-05-31 2005-12-02 Lg Philips Lcd Co Ltd Afficheur a cristaux liquides et procede de commande
US7176938B2 (en) 2004-06-14 2007-02-13 Sharp Laboratories Of America, Inc. System for reducing crosstalk
US7502087B2 (en) 2004-05-31 2009-03-10 Lg Display Co., Ltd. In-plane switching liquid crystal display and driving method thereof
US7505018B2 (en) 2004-05-04 2009-03-17 Sharp Laboratories Of America, Inc. Liquid crystal display with reduced black level insertion
US7525528B2 (en) 2004-11-16 2009-04-28 Sharp Laboratories Of America, Inc. Technique that preserves specular highlights
US7532192B2 (en) 2004-05-04 2009-05-12 Sharp Laboratories Of America, Inc. Liquid crystal display with filtered black point
US7556836B2 (en) 2004-09-03 2009-07-07 Solae, Llc High protein snack product
US7573457B2 (en) 2001-11-09 2009-08-11 Sharp Laboratories Of America, Inc. Liquid crystal display backlight with scaling
US7602369B2 (en) 2004-05-04 2009-10-13 Sharp Laboratories Of America, Inc. Liquid crystal display with colored backlight
US7612757B2 (en) 2004-05-04 2009-11-03 Sharp Laboratories Of America, Inc. Liquid crystal display with modulated black point
US7623105B2 (en) 2003-11-21 2009-11-24 Sharp Laboratories Of America, Inc. Liquid crystal display with adaptive color
US8941580B2 (en) 2006-11-30 2015-01-27 Sharp Laboratories Of America, Inc. Liquid crystal display with area adaptive backlight
US9143657B2 (en) 2006-01-24 2015-09-22 Sharp Laboratories Of America, Inc. Color enhancement technique using skin color detection

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3120751B2 (ja) 1996-11-06 2000-12-25 日本電気株式会社 横電界方式の液晶表示装置
TW530180B (en) * 1998-04-27 2003-05-01 Hitachi Ltd Active matrix type liquid crystal display
KR100315919B1 (ko) * 1998-11-12 2002-06-20 윤종용 액정표시장치및그제조방법
JP3481509B2 (ja) 1999-06-16 2003-12-22 Ｎｅｃ液晶テクノロジー株式会社 液晶表示装置
JP3264270B2 (ja) 1999-07-26 2002-03-11 日本電気株式会社 液晶表示装置
JP2002323706A (ja) * 2001-02-23 2002-11-08 Nec Corp 横電界方式のアクティブマトリクス型液晶表示装置及びその製造方法
KR100984345B1 (ko) * 2003-05-30 2010-09-30 삼성전자주식회사 박막 트랜지스터 표시판 및 이를 포함하는 액정 표시 장치
JP4154598B2 (ja) 2003-08-26 2008-09-24 セイコーエプソン株式会社 液晶表示装置の駆動法、液晶表示装置及び携帯型電子機器
KR100564219B1 (ko) 2003-12-11 2006-03-28 엘지.필립스 엘시디 주식회사 횡전계형 액정표시장치용 어레이 기판
US8395577B2 (en) 2004-05-04 2013-03-12 Sharp Laboratories Of America, Inc. Liquid crystal display with illumination control
US7777714B2 (en) 2004-05-04 2010-08-17 Sharp Laboratories Of America, Inc. Liquid crystal display with adaptive width
US7872631B2 (en) 2004-05-04 2011-01-18 Sharp Laboratories Of America, Inc. Liquid crystal display with temporal black point
KR100789091B1 (ko) 2004-06-30 2007-12-26 엘지.필립스 엘시디 주식회사 횡전계 방식 액정 표시 장치 및 그 제조 방법
KR101098891B1 (ko) * 2004-09-30 2011-12-26 엘지디스플레이 주식회사 횡전계형 액정표시장치
US7898519B2 (en) 2005-02-17 2011-03-01 Sharp Laboratories Of America, Inc. Method for overdriving a backlit display
US8050512B2 (en) 2004-11-16 2011-11-01 Sharp Laboratories Of America, Inc. High dynamic range images from low dynamic range images
US8050511B2 (en) 2004-11-16 2011-11-01 Sharp Laboratories Of America, Inc. High dynamic range images from low dynamic range images
KR101112584B1 (ko) * 2004-12-27 2012-02-15 엘지디스플레이 주식회사 횡전계형 액정표시장치
KR101158116B1 (ko) * 2005-03-04 2012-06-19 엘지디스플레이 주식회사 수평전계방식 액정표시소자
KR101256660B1 (ko) * 2005-08-31 2013-04-19 엘지디스플레이 주식회사 횡전계방식 액정표시장치 및 그 제조방법
US8121401B2 (en) 2006-01-24 2012-02-21 Sharp Labortories of America, Inc. Method for reducing enhancement of artifacts and noise in image color enhancement
EP2924498A1 (fr) 2006-04-06 2015-09-30 Semiconductor Energy Laboratory Co, Ltd. Dispositif d'affichage à cristaux liquides, dispositif semi-conducteur et dispositif électronique
JP2007334317A (ja) * 2006-05-16 2007-12-27 Semiconductor Energy Lab Co Ltd 液晶表示装置及び半導体装置
TW202449481A (zh) 2006-05-16 2024-12-16 日商半導體能源研究所股份有限公司 液晶顯示裝置
JP4952158B2 (ja) * 2006-09-15 2012-06-13 ソニー株式会社 液晶装置の製造方法
JP5429584B2 (ja) 2007-09-26 2014-02-26 Ｎｌｔテクノロジー株式会社 表示装置及びそれらを用いた携帯機器、端末装置
KR101096356B1 (ko) * 2007-11-14 2011-12-20 하이디스 테크놀로지 주식회사 횡전계모드 액정표시장치
US8760479B2 (en) 2008-06-16 2014-06-24 Samsung Display Co., Ltd. Liquid crystal display
JP5610710B2 (ja) * 2008-09-30 2014-10-22 株式会社ジャパンディスプレイ 液晶装置、電子機器
US8310609B2 (en) * 2008-09-30 2012-11-13 Sony Corporation Liquid crystal device, electronic apparatus, and method of manufacturing liquid crystal device
JP5454872B2 (ja) * 2008-09-30 2014-03-26 株式会社ジャパンディスプレイ 液晶装置、電子機器
WO2011007598A1 (fr) 2009-07-13 2011-01-20 シャープ株式会社 Dispositif d'affichage à cristaux liquides
US8804081B2 (en) * 2009-12-18 2014-08-12 Samsung Display Co., Ltd. Liquid crystal display device with electrode having opening over thin film transistor
JP2013007956A (ja) * 2011-06-27 2013-01-10 Japan Display Central Co Ltd 液晶表示装置
JP2013097190A (ja) * 2011-11-01 2013-05-20 Japan Display Central Co Ltd 液晶表示装置
JP6431321B2 (ja) * 2014-09-12 2018-11-28 株式会社ジャパンディスプレイ 液晶表示装置

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5619030A (en) * 1979-07-25 1981-02-23 Sharp Corp Production of liquid crystal display element
JPS56138713A (en) * 1980-04-01 1981-10-29 Dainippon Printing Co Ltd Orienting substrate for liquid crystal display and its manufacture
JPS63234203A (ja) * 1987-03-23 1988-09-29 Toshiba Corp カラ−フイルタ−の製造方法
JPS6484221A (en) * 1987-09-28 1989-03-29 Matsushita Electric Industrial Co Ltd Production of liquid crystal display device
JPH0380225A (ja) * 1989-08-23 1991-04-05 Seiko Epson Corp アクティブマトリックス基板
JPH04223428A (ja) * 1990-12-25 1992-08-13 Nec Corp アクティブマトリックス液晶表示装置
JPH05143020A (ja) * 1991-11-18 1993-06-11 Nec Gumma Ltd マトリクス型液晶表示装置の駆動方法
JPH06110048A (ja) * 1992-09-29 1994-04-22 Citizen Watch Co Ltd 液晶表示装置
JPH06222366A (ja) * 1992-12-04 1994-08-12 Fujitsu Ltd 液晶表示装置及びその製造方法
JPH0736058A (ja) * 1993-07-20 1995-02-07 Hitachi Ltd アクティブマトリックス型液晶表示装置
JPH07134301A (ja) * 1993-11-09 1995-05-23 Hitachi Ltd 液晶表示装置
JPH07191336A (ja) * 1993-12-27 1995-07-28 Toshiba Corp 液晶表示装置
JPH07306417A (ja) * 1994-03-17 1995-11-21 Hitachi Ltd アクティブマトリクス型液晶表示装置
WO1996000408A1 (fr) * 1994-06-24 1996-01-04 Hitachi, Ltd. Afficheur a cristaux liquides de type matrice active et son procede d'activation
JPH085990A (ja) * 1994-06-24 1996-01-12 Toshiba Corp アクティブ・マトリクス型液晶表示装置およびその駆動方法

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5619030A (en) * 1979-07-25 1981-02-23 Sharp Corp Production of liquid crystal display element
JPS56138713A (en) * 1980-04-01 1981-10-29 Dainippon Printing Co Ltd Orienting substrate for liquid crystal display and its manufacture
JPS63234203A (ja) * 1987-03-23 1988-09-29 Toshiba Corp カラ−フイルタ−の製造方法
JPS6484221A (en) * 1987-09-28 1989-03-29 Matsushita Electric Industrial Co Ltd Production of liquid crystal display device
JPH0380225A (ja) * 1989-08-23 1991-04-05 Seiko Epson Corp アクティブマトリックス基板
JPH04223428A (ja) * 1990-12-25 1992-08-13 Nec Corp アクティブマトリックス液晶表示装置
JPH05143020A (ja) * 1991-11-18 1993-06-11 Nec Gumma Ltd マトリクス型液晶表示装置の駆動方法
JPH06110048A (ja) * 1992-09-29 1994-04-22 Citizen Watch Co Ltd 液晶表示装置
JPH06222366A (ja) * 1992-12-04 1994-08-12 Fujitsu Ltd 液晶表示装置及びその製造方法
JPH0736058A (ja) * 1993-07-20 1995-02-07 Hitachi Ltd アクティブマトリックス型液晶表示装置
JPH07134301A (ja) * 1993-11-09 1995-05-23 Hitachi Ltd 液晶表示装置
JPH07191336A (ja) * 1993-12-27 1995-07-28 Toshiba Corp 液晶表示装置
JPH07306417A (ja) * 1994-03-17 1995-11-21 Hitachi Ltd アクティブマトリクス型液晶表示装置
WO1996000408A1 (fr) * 1994-06-24 1996-01-04 Hitachi, Ltd. Afficheur a cristaux liquides de type matrice active et son procede d'activation
JPH085990A (ja) * 1994-06-24 1996-01-12 Toshiba Corp アクティブ・マトリクス型液晶表示装置およびその駆動方法

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7573457B2 (en) 2001-11-09 2009-08-11 Sharp Laboratories Of America, Inc. Liquid crystal display backlight with scaling
US7623105B2 (en) 2003-11-21 2009-11-24 Sharp Laboratories Of America, Inc. Liquid crystal display with adaptive color
US7602369B2 (en) 2004-05-04 2009-10-13 Sharp Laboratories Of America, Inc. Liquid crystal display with colored backlight
US7505018B2 (en) 2004-05-04 2009-03-17 Sharp Laboratories Of America, Inc. Liquid crystal display with reduced black level insertion
US7532192B2 (en) 2004-05-04 2009-05-12 Sharp Laboratories Of America, Inc. Liquid crystal display with filtered black point
US7612757B2 (en) 2004-05-04 2009-11-03 Sharp Laboratories Of America, Inc. Liquid crystal display with modulated black point
US7502087B2 (en) 2004-05-31 2009-03-10 Lg Display Co., Ltd. In-plane switching liquid crystal display and driving method thereof
FR2870947A1 (fr) * 2004-05-31 2005-12-02 Lg Philips Lcd Co Ltd Afficheur a cristaux liquides et procede de commande
US7342592B2 (en) 2004-06-14 2008-03-11 Sharp Laboratories Of America, Inc. System for reducing crosstalk
US7176938B2 (en) 2004-06-14 2007-02-13 Sharp Laboratories Of America, Inc. System for reducing crosstalk
US7556836B2 (en) 2004-09-03 2009-07-07 Solae, Llc High protein snack product
US7525528B2 (en) 2004-11-16 2009-04-28 Sharp Laboratories Of America, Inc. Technique that preserves specular highlights
US9143657B2 (en) 2006-01-24 2015-09-22 Sharp Laboratories Of America, Inc. Color enhancement technique using skin color detection
US8941580B2 (en) 2006-11-30 2015-01-27 Sharp Laboratories Of America, Inc. Liquid crystal display with area adaptive backlight

Also Published As

Publication number Publication date
JP3567183B2 (ja) 2004-09-22
TW406206B (en) 2000-09-21
JPH1062802A (ja) 1998-03-06

Similar Documents

Publication Publication Date Title
WO1998008134A1 (fr) Dispositif d'affichage a cristaux liquides
JP3831863B2 (ja) 液晶表示装置
US6281957B1 (en) In-plane switching mode liquid crystal display device
TWI380430B (en) Electrostatic discharge protection circuit, manufacturing method thereof and liquid crystal display device having the same
JP2701698B2 (ja) 液晶表示装置
KR100536851B1 (ko) 액정표시장치
US7138656B2 (en) Liquid crystal display panel and fabricating method thereof
JP5329169B2 (ja) 薄膜トランジスタ基板及びこれを含む液晶表示装置
US8305538B2 (en) Low-cost large-screen wide-angle fast-response liquid crystal display apparatus
CN101055361B (zh) 横电场方式的液晶显示装置
US20090033608A1 (en) Display device
US6762819B2 (en) Liquid crystal display device with electrodes on barrier ribs and fabricating method thereof
JP2002287163A (ja) 液晶表示装置及びその製造方法
JPH06214244A (ja) アクティブマトリクス型液晶表示装置
US20080284965A1 (en) Liquid crystal display device and fabricating method thereof
US8355090B2 (en) Liquid crystal display having reduced kickback effect
JPH0728091A (ja) 液晶表示装置
WO2018170983A1 (fr) Substrat de réseau et panneau d'affichage à cristaux liquides
JP3194873B2 (ja) アクティブマトリックス型液晶表示装置およびその駆動方法
KR100430376B1 (ko) 액정디스플레이
US9373647B2 (en) Thin film transistor array panel and liquid crystal display including the same
JP2005010721A (ja) 液晶表示装置
JP2002122876A (ja) 液晶表示装置
KR20020054909A (ko) 프린지필드구동 액정표시장치 및 그 제조방법
CN114764203A (zh) 一种显示面板及显示装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA CN KR SG US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA