Patent Grant
8068201
This application is the U.S. national phase of International Application No. PCT/JP2007/073231 filed 30 Nov. 2007, which designated the U.S. and claims priority to Japan Application No. 2006-339795 filed 18 Dec. 2006, the entire contents of each of which are hereby incorporated by reference.
The present invention relates to a liquid crystal display device, and in particular to a liquid crystal display device which is suitably used in mobile information terminals (e.g., PDAs), mobile phones, liquid crystal displays for vehicle mounting, digital cameras, personal computers, amusement devices, television sets, and the like.
In recent years, on the strength of being thin and having a low power consumption, liquid crystal display devices are broadly used in laptop-type personal computers, mobile phones, information devices such as electronic organizers, camera-integrated VTRs having a liquid crystal monitor, and the like.
As a display mode which can realize a high contrast and a wide viewing angle, a vertical alignment mode utilizing a vertical-alignment type liquid crystal layer is drawing attention. In general, a vertical-alignment type liquid crystal layer is formed by using a liquid crystal material having negative dielectric anisotropy and vertical alignment films.
For example, Patent Document 1 discloses a liquid crystal display device whose viewing angle characteristics are improved by allowing an oblique electric field to be generated near an aperture that is provided in a counter electrode, and around a liquid crystal molecule within the aperture which is in a vertical alignment state, allowing the surrounding liquid crystal molecules to take an inclined orientation.
However, with the construction described in Patent Document 1, it is difficult to form an oblique electric field across the entire region within the pixel. This leads to a problem in that regions in which the liquid crystal molecules have a slow response to voltage occur within the pixel, thus causing an afterimage phenomenon.
In order to solve this problem, Patent Document 2 discloses a technique in which, regularly-arranged apertures are provided in the pixel electrode or the counter electrode to form a plurality of liquid crystal domains exhibiting axisymmetric orientation within the pixel.
Furthermore, Patent Document 3 discloses a technique of providing an auxiliary electrode for stably performing orientation control with an oblique electric field on an active matrix substrate. This auxiliary electrode is provided in a position corresponding to a slit which is formed in a pixel electrode. Moreover, this auxiliary electrode is formed integrally with a storage capacitor electrode for constituting a storage capacitor, and is formed concurrently with and from the same metal film as the gate lines, in a step of forming the gate lines.
However, since the auxiliary electrode disclosed in Patent Document 3 is made of a metal film, it lowers the aperture ratio of the pixel and decreases light transmittance. In order to solve this problem, it may be possible to compose the auxiliary electrode from a transparent ITO film. In this case, however, extra steps such as deposition and patterning of an ITO film (which needs to be separately formed in addition to the ITO film for composing the pixel electrode) must be provided, thus resulting in an increased number of steps.
The present invention has been made in view of the above problems, and an objective thereof is to stably perform orientation control with an oblique electric field in a liquid crystal display device of the vertical alignment mode, and suppress decrease in light transmittance without much increase in the number of production steps.
A liquid crystal display device according to the present invention is a liquid crystal display device comprising a first substrate, a second substrate provided so as to oppose the first substrate, and a vertical-alignment type liquid crystal layer provided between the first substrate and the second substrate, the liquid crystal display device having a plurality of pixels each including: a switching element which is provided on the first substrate and at least includes a semiconductor layer; a pixel electrode electrically connected to the switching element; a counter electrode opposing the pixel electrode; and the liquid crystal layer interposed between the pixel electrode and the counter electrode, the pixel electrode including at least one aperture or recessed portion formed at a predetermined position in the pixel, and in each of the pixels, when at least a predetermined voltage is applied across the liquid crystal layer, a plurality of regions being created where liquid crystal molecules tilt in respectively different azimuthal directions, wherein, the first substrate includes an auxiliary electrode to which a different potential from that for the pixel electrode is applied; and the auxiliary electrode includes a portion overlapping at least one aperture or recessed portion of the pixel electrode, and is made of a same film as the semiconductor layer of the switching element.
In a preferred embodiment, the auxiliary electrode further includes a portion located near an outer periphery of the pixel electrode.
In a preferred embodiment, in each of the plurality of pixels, a plurality of liquid crystal domains each exhibiting an axisymmetric orientation are created when at least a predetermined voltage is applied across the liquid crystal layer.
In a preferred embodiment, a potential which is substantially the same as that for the counter electrode is applied to the auxiliary electrode.
In a preferred embodiment, the switching element is a thin film transistor whose channel region is a portion of the semiconductor layer.
In a preferred embodiment, the semiconductor layer and the auxiliary electrode are made of amorphous silicon or crystalline silicon.
In a preferred embodiment, the auxiliary electrode has a light transmittance of 60% or more.
In a preferred embodiment, the first substrate includes a storage capacitor line; and the auxiliary electrode is electrically connected to the storage capacitor line.
In a preferred embodiment, the first substrate includes a connection electrode for electrically connecting the auxiliary electrode and the storage capacitor line; and the connection electrode is provided outside a displaying region which is defined by the plurality of pixels.
In a preferred embodiment, the first substrate includes a connection electrode for electrically connecting the auxiliary electrode and the storage capacitor line; the connection electrode is provided in each of the plurality of pixels; and the auxiliary electrode partially overlaps the storage capacitor line.
In a preferred embodiment, the connection electrode is disposed so that the entire connection electrode overlaps the storage capacitor line.
In a preferred embodiment, the first substrate includes a signal line; and the connection electrode is made of a same film as the signal line.
A liquid crystal display device according to the present invention has an auxiliary electrode which includes a portion overlapping an aperture or recessed portion of a pixel electrode. By applying a different potential from that for the pixel electrode to the auxiliary electrode, the intensity of an orientation restriction force due to an oblique electric field which is generated in the aperture or recessed portion can be controlled. For example, an oblique electric field whose equipotential lines dip more steeply in the aperture or recessed portion can be generated, whereby a strong orientation restriction force can be obtained. As a result, it is possible to stably perform orientation control with an oblique electric field. Since the auxiliary electrode is made of the same film as the semiconductor layer of the switching element, it is possible to suppress decrease in light transmittance without much increase in the number of production steps.
Hereinafter, with reference to the drawings, embodiments of the present invention will be described. Note that the present invention is not limited to the following embodiments.
With reference to
The liquid crystal display device 100 includes an active matrix substrate 60, a counter substrate (color filter substrate) 70 provided so as to oppose the active matrix substrate 60, and a vertical-alignment type liquid crystal layer 50 provided therebetween.
Each of the plurality of pixels of the liquid crystal display device 100 includes a thin film transistor (TFT) 1 provided on the active matrix substrate 60, a pixel electrode 2 electrically connected to the thin film transistor 1, a counter electrode 3 opposing the pixel electrode 2, and a liquid crystal layer 50 interposed between the pixel electrode 2 and the counter electrode 3.
Hereinafter, the more specific structure of the active matrix substrate 60 and the counter substrate 70 will be described.
The active matrix substrate 60 includes a transparent substrate (e.g., a glass substrate or a plastic substrate) 10 supporting its component elements. A basecoat film 11 is formed on a surface of the transparent substrate 10 closer to the liquid crystal layer 50, and a semiconductor layer 12 of continuous grain silicon (CGS) is formed on the basecoat film 11. A portion of the semiconductor layer 12 functions as a channel region of the thin film transistor 1, and other portions function as a source region and a drain region.
A gate insulating film 13 is formed so as to cover the semiconductor layer 12. A gate electrode 14, a scanning line 15, and a storage capacitor line 16 are formed on the gate insulating film 13, and a first interlayer insulating film 17 is formed so as to cover them.
On the first interlayer insulating film 17, a source electrode 18, a drain electrode 19, and a signal line 20 are formed. In contact holes which are formed in the gate insulating film 13 and the first interlayer insulating film 17, the source electrode 18 and the drain electrode 19 are connected to the semiconductor layer 12.
A second interlayer insulating film 21 is formed so as to cover the source electrode 18, the drain electrode 19, and the signal line 20, and a pixel electrode 2 is provided on the second interlayer insulating film 21. The second interlayer insulating film 21 is an organic insulating film made of an acrylic type photosensitive resin or the like, for example. The pixel electrode 2 is made of a transparent electrically conductive material (e.g. ITO). On a surface of the transparent substrate 10 opposite from the liquid crystal layer 50, a polarizer 23 is provided.
On a surface of the transparent substrate 30 closer to the liquid crystal layer 50, the counter substrate 70 includes a color filter 31, a light shielding layer (also referred to as a black matrix) 32, and the counter electrode in this order. The counter electrode 3 is made of a transparent electrically conductive material (e.g. ITO). On a surface of the transparent substrate 30 opposite from the liquid crystal layer 50, a polarizer 34 is provided.
The liquid crystal layer 50 interposed between the active matrix substrate 60 and the counter substrate 70 is made of a nematic liquid crystal material having a negative dielectric anisotropy, and contains a chiral agent as necessary. On surfaces of the active matrix substrate 60 and the counter substrate 70 that are in contact with the liquid crystal layer 50, vertical alignment films 22 and 33 are provided. The vertical alignment films 22 and 33 cause liquid crystal molecules 51 in the liquid crystal layer 50 to be aligned substantially perpendicular to their surfaces. The vertical alignment films 22 and 33 are made of polyimide resin, for example.
A pixel electrode 2 of the liquid crystal display device 100 includes a plurality of recessed portions 2a formed at predetermined positions in the pixel. In the present embodiment, four recessed portions 2a are provided in the pixel electrode 2, and the pixel is divided into three regions by the recessed portions 2a. The individual regions divided by the recessed portions 2a are also referred to as subpixels.
When a predetermined potential difference is given between the pixel electrode 2 and the counter electrode 3 (i.e., a predetermined voltage is applied across the liquid crystal layer 50), an oblique electric field (a potential gradient which is tilted with respect to the substrate surface) is generated near the outer periphery of the pixel electrode 2 and at the recessed portions 2a, and this oblique electric field defines the directions in which the liquid crystal molecules 51 fall. Due to the action of the oblique electric field, a plurality of (herein three) liquid crystal domains are created each exhibiting an axisymmetric orientation. In each liquid crystal domain, the liquid crystal molecules 51 are orientated in almost all azimuthal directions, and thus, when a voltage is applied across the liquid crystal layer 50, a plurality of regions are formed in which the liquid crystal molecules 51 are tilted in respectively different azimuthal directions in the liquid crystal display device 100.
With reference to
As shown in
Under an applied voltage, the liquid crystal molecules 51 having a negative dielectric anisotropy are tilted so that their molecular major axes are perpendicular to the electric lines of force (i.e., parallel to the equipotential lines), and therefore, the directions in which the liquid crystal molecules 51 fall are defined by an oblique electric field which is generated near the outer periphery of and at the recessed portions 2a of the pixel electrode 2. Therefore, as shown in
Thereafter, with lapse of time, the other liquid crystal molecules 51 will be orientated in continuous manners (so as to match the orientations of the liquid crystal molecules 51 that were the first to be tilted), whereby liquid crystal domains as shown in
Herein, “axisymmetric orientation” is synonymous with “radially-inclined orientation” in Patent Document 1. Around the center axis of axisymmetric orientation, the liquid crystal molecules 51 are continuously oriented without forming disclination lines, and the major axes of the liquid crystal molecules 51 are oriented in a radial, tangential, or spiral manner. In either case, the major axes of the liquid crystal molecules 51 have components which are radially-inclined from the center of orientation (components which are parallel to the oblique electric field).
Note that it is not necessary that a plurality of recessed portions 2a be provided as is exemplified herein; it suffices if at least one recessed portion 2a is provided. For example, in the case where a pixel is divided into two regions, liquid crystal domains with axisymmetric orientations can be created by providing only one oblong recessed portion 2a. Moreover, an aperture may be provided instead of a recessed portion 2a (or in addition to a recessed portion 2a). In the case where an aperture is provided in the pixel electrode 2, as in the case of a recessed portion 2a, an oblique electric field is formed in any aperture surrounded by the electrically-conductive film of the pixel electrode 2, thus defining the directions in which the liquid crystal molecules 51 are tilted due to an electric field.
Next, the construction of the liquid crystal display device 100 according to the present embodiment will be described in more detail.
As shown in
As shown in
The liquid crystal display device 100 of the present embodiment includes auxiliary electrodes 4 as described above. By applying a different potential from that for the pixel electrode 2 to each auxiliary electrode 4, it becomes possible to control the intensity of the orientation restriction force due to an oblique electric field. Hereinafter, this point will be described in more detail.
When a voltage is applied across the liquid crystal layer 50, as shown in
In the case where auxiliary electrodes 4 are not provided, as shown in
On the other hand, in the case where an auxiliary electrode 4 is provided and substantially the same potential as that for the counter electrode 3 is applied to the auxiliary electrode 4, as shown in
As described above, since the liquid crystal display device 100 in the present embodiment includes the auxiliary electrodes 4, orientation control can be stably performed with an oblique electric field. Moreover, since the auxiliary electrodes 4 are made of the same film as the semiconductor layer 12 of the thin film transistor 1, a high light transmittance can be provided. For example, an auxiliary electrode 4 which is made of continuous grain silicon (CGS) can realize a light transmittance of about 80% with a thickness of about 50 nm. Furthermore, since the auxiliary electrodes 4 are made of the same film as the semiconductor layer 12 of the thin film transistor 1, hardly any new steps for providing the auxiliary electrodes 4 are needed. Therefore, it is possible to suppress decrease in light transmittance without much increase in the number of production steps.
The present embodiment illustrates as a switching element the thin film transistor 1 including the semiconductor layer 12 which is made of continuous grain silicon; however, the switching element is not limited thereto. The semiconductor layer 12 may be made of crystalline silicon such as continuous grain silicon or polycrystalline silicon, or made of amorphous silicon.
The liquid crystal display device 100′ also includes auxiliary electrodes 4 made of the same film as the semiconductor layer 12 of the thin film transistor 1′ (i.e., made of amorphous silicon). Therefore, effects similar to those of the liquid crystal display device 100 are obtained. The thickness of the auxiliary electrode 4 made of amorphous silicon is about 35 nm, for example.
Note that, in each of the liquid crystal display devices 100 and 100′, the thickness of the auxiliary electrodes 4 is not limited to the exemplified value. However, in order to sufficiently suppress decrease in the light transmittance of a pixel, the auxiliary electrodes 4 are preferably formed with a thickness such that it has a light transmittance of 60% or more, and more preferably 80% or more. An auxiliary electrode 4 made of crystalline silicon can realize a light transmittance of 80% or more with a thickness of 60 nm or less, and a light transmittance of 60% or more with a thickness of 114 nm or less. Note that the semiconductor layer 12 of the switching element and the auxiliary electrodes 4 do not need to have the same thickness, and they may have respectively different thicknesses. However, from the standpoint of suppressing increase in the number of steps, it is preferable that they have almost the same thickness.
With reference to
As shown in
However, the liquid crystal display device 200 of the present embodiment differs from the liquid crystal display device 100 of Embodiment 1 in terms of the manner of electrical connection between an auxiliary electrode 4 and a storage capacitor line 16. In the liquid crystal display device 100, as is also shown in
On the other hand, in the liquid crystal display device 200, as can also be seen from
Specifically, as shown in
The connection electrode 5 in the present embodiment is made of the same film as the signal line 20. The connection electrode 5 is formed as shown in
a) shows, in the steps of producing the active matrix substrate 60, a state where the basecoat film 11, the auxiliary electrodes 4, the gate insulating film 13, the storage capacitor lines 16, and the first interlayer insulating film 17 have been stacked on the transparent substrate 10.
After the first interlayer insulating film 17 is deposited, the gate insulating film 13 and the first interlayer insulating film 17 above the portions of the semiconductor layer 12 to become source regions and gate regions are removed, whereby contact holes are formed. At this time, as shown in
Thereafter, by depositing an electrically-conductive film on the first interlayer insulating film 17 and then patterning the electrically-conductive film, the source electrodes 18, the drain electrodes 19, and the signal lines 20 are formed. At this time, as shown in
As shown in
Also in the present embodiment, the thin film transistor 1 including the semiconductor layer 12 which is made of continuous grain silicon is illustrated a switching element; however, the switching element is not limited thereto. The semiconductor layer 12 may be made of crystalline silicon such as continuous grain silicon or polycrystalline silicon, or made of amorphous silicon.
The liquid crystal display device 200′ also includes auxiliary electrodes 4 which are made of the same film as the semiconductor layer 12 of the thin film transistors 1′ (i.e., made of amorphous silicon). Therefore, it is possible to stably perform orientation control with an oblique electric field, and also suppress decrease in light transmittance.
In the liquid crystal display device 200′, too, as can also be seen from
Note that, in the liquid crystal display device 100 of Embodiment 1, as shown in
However, in the case where a connection electrode 5 is provided within the pixel, the light transmittance of the pixel may be lowered, depending on the relative positioning of the auxiliary electrode 4 and the storage capacitor line 16. For example, as shown in
On the other hand, in the case where the auxiliary electrode 4 and the storage capacitor line 16 partially overlap, as shown in
In Embodiments 1 and 2, the present invention has been described by taking a transmission type liquid crystal display device which presents display in the transmission mode as an example. However, the present invention is also suitably used for a transmission/reflection combination type liquid crystal display device which is capable of presenting display in both of the transmission mode and the reflection mode.
Each pixel of the liquid crystal display device 300 includes a transmission region T which presents display in the transmission mode and a reflection region R which presents display in the reflection mode. A pixel electrode 2 of the liquid crystal display device 300 includes a transparent electrode 2T which is made of an electrically conductive material having a high light transmittance (e.g. ITO) and a reflection electrode 2R which is made of an electrically conductive material having a high light reflectance (e.g. aluminum). The transparent electrode 2T is formed across both of the two subpixels, whereas the reflection electrode 2R is selectively formed in only one of the subpixels, so that the region where the reflection electrode 2R is formed functions as the reflection region R.
Moreover, a transparent dielectric layer 35 is provided in the region of the counter substrate 70 corresponding to the reflection region R, so that the thickness of the liquid crystal layer 50 in the reflection region R is smaller than the thickness of the liquid crystal layer 50 in the transmission region T. The light which is utilized in the reflection mode travels through the liquid crystal layer 50 twice, whereas the light which is utilized in the transmission mode travels through the liquid crystal layer 50 only once. However, as mentioned above, the liquid crystal layer 50 in the reflection region R is made thinner than the liquid crystal layer 50 in the transmission region T, so that the optical path difference between the reflection region R and the transmission region T can be reduced. As a result, display can be suitably presented in both of the reflection region R and the transmission region T.
The liquid crystal display device 300 also includes auxiliary electrodes 4 which are made of the same film as the semiconductor layer 12 of the thin film transistor 1. Therefore, it is possible to stably perform orientation control with an oblique electric field and also suppress decrease in light transmittance without much increase in the number of production steps.
Note that Embodiments 1, 2, and 3 described above illustrate constructions where orientation restriction structures (recessed portions 2a of the pixel electrode 2) are provided only on the active matrix substrate 60. However, as necessary, orientation restriction structures may be provided also on the counter substrate 70.
Each protrusion 6 projecting toward the liquid crystal layer 50 has a slanted side face, and an orientation restriction force is exhibited due to an anchoring effect of the vertical alignment film 33 on this side face. The orientation restriction force due to the protrusion 6 acts to orient the liquid crystal molecules 51 in the same directions as the orientation restriction forces due to the recessed portions 2a of the pixel electrode 2, so that the axisymmetric orientation of the liquid crystal molecules 51 in the subpixel is further stabilized. Moreover, since the axisymmetric orientation is created around the protrusion 6 which is provided in the substantial center of a subpixel (i.e., the protrusion 6 is provided in a region corresponding to the substantial center of a liquid crystal domain), the center of the axisymmetric orientation is fixed near the protrusion 6.
Thus, the axisymmetric orientation can be stabilized by: restricting the orientation directions, mainly, the liquid crystal molecules 51 around the subpixel with the orientation restriction structures provided on the one substrate (the recessed portions 2a or apertures of the pixel electrode 2), and restricting the orientations of the liquid crystal molecules 51 at the central portion of the subpixel with the orientation restriction structure (protrusion 6) provided on the other substrate. This makes it possible to shorten the response time in gray-scale displaying, and the time in which a disturbance in orientation resulting from pressing the panel surface is eliminated.
Note that the orientation restriction structures to be provided on the counter substrate 70 are not limited to the protrusion 6 as illustrated. For example, apertures located at the subpixel centers may be provided on the counter electrode 3.
According to the present invention, in a vertical alignment mode liquid crystal display device, it is possible to stably perform orientation control with an oblique electric field, and also suppress decrease in light transmittance without much increase in the number of production steps. The present invention is suitably used for a transmission type or transmission/reflection combination type liquid crystal display device which is active-matrix driven.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-339795 | Dec 2006 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2007/073231 | 11/30/2007 | WO | 00 | 6/16/2009 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2008/075549 | 6/26/2008 | WO | A |
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