JP2007133294A - Liquid crystal device and electronic apparatus - Google Patents

Liquid crystal device and electronic apparatus Download PDF

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Publication number
JP2007133294A
JP2007133294A JP2005328441A JP2005328441A JP2007133294A JP 2007133294 A JP2007133294 A JP 2007133294A JP 2005328441 A JP2005328441 A JP 2005328441A JP 2005328441 A JP2005328441 A JP 2005328441A JP 2007133294 A JP2007133294 A JP 2007133294A
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liquid crystal
electrode
crystal device
layer
insulating film
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JP2005328441A
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Eiji Chino
Masakatsu Higa
Hayato Kurasawa
Satoshi Taguchi
隼人 倉澤
英治 千野
政勝 比嘉
聡志 田口
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Epson Imaging Devices Corp
エプソンイメージングデバイス株式会社
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Abstract

It is an object of the present invention to provide a transflective liquid crystal device of a horizontal electric field type capable of obtaining a high quality display in both a reflection display and a transmission display.
A transflective liquid crystal device 100 according to the present invention includes a pixel electrode 9 having a plurality of strip electrodes 9c electrically connected to each other in a pixel region on a side surface of a liquid crystal layer 50 of a TFT array substrate 10. A common electrode 19 provided on the substrate body 10A side of the pixel electrode 9 to generate an electric field between the pixel electrode 9 and an interlayer insulating film 13 interposed between the pixel electrode 9 and the common electrode 19 The reflective display region R is provided with a reflective polarizing layer 29 that selectively reflects and scatters a part of the polarization component of incident light.
[Selection] Figure 3

Description

  The present invention relates to a liquid crystal device and an electronic apparatus.

As one form of a liquid crystal device, there is known a method of controlling the alignment of liquid crystal molecules by applying an electric field in the substrate surface direction to a liquid crystal layer (hereinafter referred to as a transverse electric field method), and applying an electric field to liquid crystal There are known what are called an IPS (In-Plane Switching) system, an FFS (Frige-Field Switching) system, etc., depending on the form of electrodes to be used (see, for example, Patent Document 1).
JP 2003-131248 A

  By the way, since a portable information terminal such as a cellular phone is used in various environments, a transflective liquid crystal device is used for its display unit. Therefore, the present inventor has studied a transflective liquid crystal device of a type in which liquid crystal is driven by a horizontal electric field (or an oblique electric field). In the above IPS type or FFS type liquid crystal device, the liquid crystal device is simply reflected in the pixel region. It has been found that transflective display cannot be performed only by providing a layer. Accordingly, it is an object of the present invention to provide a transflective liquid crystal device of a horizontal electric field type capable of obtaining a high quality display in both a reflective display and a transmissive display.

In order to solve the above problems, the liquid crystal device of the present invention includes a first substrate and a second substrate that face each other with a liquid crystal layer interposed therebetween, and a reflective display region and a transmissive display region are provided in one pixel region. In the pixel region, an electric field is generated between the first electrode having a plurality of band-shaped electrodes electrically connected to each other and the first electrode with respect to the first electrode. A transflective liquid crystal device provided with a second electrode to be generated and an interlayer insulating film interposed between the first electrode and the second electrode, wherein incident light is incident on the reflective display region. A reflective polarizing layer that selectively reflects the light having a predetermined polarization component and a light scattering means that scatters the light reflected by the reflective polarizing layer are provided.
This liquid crystal device employs a method of driving a liquid crystal by forming a first electrode and a second electrode on one substrate constituting the liquid crystal device and applying an electric field formed between them to the liquid crystal layer. It is. In the liquid crystal device of the present invention, a transflective reflective polarizing layer is provided, and a light scattering means is provided in the reflective display region, so that both transmissive display and reflective display are good, and a simple configuration is achieved. By using it, a transflective liquid crystal device of a horizontal electric field type can be realized. Further, according to the present invention, it is possible to obtain a display with high brightness and high contrast in both reflection display and transmission display without adopting a conventionally known multi-gap structure as a configuration of a transflective liquid crystal device. .

  In the liquid crystal device of the present invention, it is preferable that the second electrode is formed so as to cover the reflective polarizing layer made of a metal film having a plurality of fine slit-like openings. The reflective polarizing layer composed of the metal film having the above structure is easily damaged when exposed to a solvent or the like during the manufacturing process of the first substrate, and its shape control greatly affects the degree of polarization of the reflective polarizing layer. It is important to protect the formed reflective polarizing layer. Therefore, by covering the reflective polarizing layer with the second electrode as described above, it is possible to protect well from solvents and the like, and the reflective polarizing layer as a conductor is electrically connected to the second electrode. Therefore, it is possible to effectively prevent the reflective polarizing layer from being in an electrically floating state and affecting liquid crystal and device operation.

  In the liquid crystal device of the present invention, a plurality of fine slit-shaped openings are provided in a region where the first electrode and the interlayer insulating film overlap in a plane, and between the first electrode and the interlayer insulating film. It can also be set as the structure in which the said reflective polarizing layer which consists of a provided metal film is formed. That is, a configuration in which the reflective polarizing layer is provided corresponding to the formation region of the first electrode can also be adopted. With such a configuration, a liquid crystal device in which the formation region of the first electrode forms a reflective display region and the region outside the first electrode forms a transmissive display region. Since the electric field between the first electrode and the second electrode is mainly formed in the vicinity of the edge of the first electrode, the action of the electric field is weakened in the region immediately above the first electrode, and disclination is likely to occur. Then, in the form in which the first electrode formation region is used as the transmissive display region, the transmissive display characteristics are degraded by the disclination. On the other hand, if this configuration is adopted, the entire area where the above disclination occurs is included in the reflective display area, so that it is possible to prevent the deterioration of the transmissive display characteristics. In addition, the reflective polarizing layer that is easily damaged by a solvent or the like can be well protected by the first electrode.

  In the liquid crystal device according to the aspect of the invention, a switching element electrically connected to the first electrode and a conductive wiring electrically connected to the switching element are provided on the liquid crystal layer side of the first substrate. The reflective polarizing layer made of a metal film provided with a plurality of fine slit-like openings is provided with the conductive wiring, or between the layer provided with the conductive wiring and the first substrate. It can also be set as the structure provided in between. With such a configuration, since the reflective polarizing layer is formed on the side close to the substrate, there is an advantage that it is easy to form a fine slit-shaped opening with high accuracy. In addition, since the reflective polarizing layer that is easily damaged can be covered with an insulating film included in the structure of the switching element, it is also effective in protecting the reflective polarizing layer.

  In the liquid crystal device of the present invention, the reflective polarizing layer may be formed on the liquid crystal layer side of the first substrate. By adopting such a configuration, the reflective polarizing layer can be easily formed, and an insulating film and a conductive film as a means for protecting the reflective polarizing layer can be easily formed, and the reflective polarizing layer can be well protected. it can. Further, if an uneven surface is formed on the surface of the substrate, an uneven shape can be easily imparted to the reflective polarizing layer formed on the uneven surface, and a reflective polarizing layer having a light scattering means can be obtained.

  In the liquid crystal device according to the aspect of the invention, the switching element has a structure in which a conductive film, an element insulating film, and a conductive film are stacked, and the interlayer interposed between the first electrode and the second electrode. The insulating film may be an insulating film having the same layer and the same film thickness as the element insulating film. With this configuration, the switching element and the electrode structure can share an insulating film, so that the number of wiring layers stacked on the first substrate can be reduced, the manufacturing efficiency of the first substrate, and the first substrate can be reduced. Surface planarization can be achieved.

  In the liquid crystal device according to the aspect of the invention, the interlayer insulating film includes a first insulating film having the same layer and the same thickness as the element insulating film, and a second insulating film laminated with the first insulating film. It can also be. When the element insulating film is used as the interlayer insulating film interposed between the first electrode and the second electrode, the film thickness of the element insulating film may be unpredictable as the film thickness of the interlayer insulating film. Therefore, if this configuration is adopted, the thickness of the correlation insulating film can be easily adjusted by the thickness of the second insulating film, which is effective in obtaining desired display characteristics.

In the liquid crystal device according to the aspect of the invention, a concavo-convex surface that imparts a light-scattering concavo-convex shape to the reflective polarizing layer is formed in a region overlapping the reflective polarizing layer on the liquid crystal layer side of the first substrate. It is preferable. With such a configuration, since the light scattering property can be imparted to the reflective polarizing layer itself, the attenuation of the reflected light is small and a bright display can be obtained.
In the liquid crystal device of the present invention, a scattering property imparting layer that imparts a light scattering irregularity shape to the reflective polarization layer is provided between the reflective polarization layer and the first substrate. You can also.

  An electronic apparatus according to the present invention includes the liquid crystal device according to the present invention described above. According to such a configuration, it is possible to provide an electronic apparatus including a display unit that can perform favorable display in both reflective display and transmissive display.

(First embodiment)
Hereinafter, a liquid crystal device according to a first embodiment of the present invention will be described with reference to the drawings. The liquid crystal device according to the present embodiment employs a method called an FFS (Fringe Field Switching) method among methods for displaying an image by applying an electric field substantially in the direction of the substrate surface to the liquid crystal to control alignment. It is. In addition, the liquid crystal device of this embodiment is a color liquid crystal device having a color filter on a substrate, and three subpixels that output light of each color of R (red), G (green), and B (blue). Each pixel is configured. Therefore, an area constituting a minimum unit of display is called a “sub-pixel area”, and an area constituted by a set of (R, G, B) sub-pixels is called a “pixel area”.

FIG. 1 is a circuit configuration diagram of a plurality of sub-pixel regions formed in a matrix that constitutes the liquid crystal device of the present embodiment. FIG. 2A is a plan configuration diagram in an arbitrary one sub-pixel region of the liquid crystal device 100, and FIG. 2B is an explanatory diagram showing an arrangement relationship of optical axes of optical elements and the like constituting the liquid crystal device 100. FIG. is there. FIG. 3 is a partial cross-sectional configuration diagram taken along the line AA ′ of FIG.
In each drawing, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing.

  As shown in FIG. 1, a pixel electrode 9 and a TFT 30 for switching control of the pixel electrode 9 are formed in a plurality of sub-pixel areas formed in a matrix that constitutes an image display area of the liquid crystal device 100. The data line 6 a extending from the data line driving circuit 101 is electrically connected to the source of the TFT 30. The data line driving circuit 101 supplies the image signals S1, S2,..., Sn to each pixel via the data line 6a. The image signals S1 to Sn may be supplied line-sequentially in this order, or may be supplied for each group to a plurality of adjacent data lines 6a.

  Further, the scanning line 3a extending from the scanning line driving circuit 102 is electrically connected to the gate of the TFT 30, and the scanning signal G1 is supplied from the scanning line driving circuit 102 to the scanning line 3a in a pulse manner at a predetermined timing. , G2,..., Gm are applied to the gate of the TFT 30 in the order of lines in this order. The pixel electrode 9 is electrically connected to the drain of the TFT 30. The TFT 30 serving as a switching element is turned on for a certain period by the input of scanning signals G1, G2,..., Gm, so that the image signals S1, S2,. Writing is performed on the pixel electrode 9.

  Image signals S1, S2,..., Sn written to the liquid crystal via the pixel electrode 9 are held for a certain period between the pixel electrode 9 and the common electrode opposed via the liquid crystal. Here, in order to prevent the held image signal from leaking, a storage capacitor 70 is provided in parallel with the liquid crystal capacitor formed between the pixel electrode 9 and the common electrode. The storage capacitor 70 is interposed between the drain of the TFT 30 and the capacitor line 3b.

  Next, a detailed configuration of the liquid crystal device 100 will be described with reference to FIGS. The liquid crystal device 100 has a configuration in which a liquid crystal layer 50 is sandwiched between a TFT array substrate (first substrate) 10 and a counter substrate (second substrate) 20 as shown in FIG. The TFT array substrate 10 and the counter substrate 20 are sealed between the substrates 10 and 20 by a seal material (not shown) provided along an edge of a region where the TFT array substrate 10 and the counter substrate 20 face each other. Polarizing plates 14 and 24 are provided on the outer surface side of the TFT array substrate 10 and the outer surface side of the counter substrate 20, respectively. In addition to the polarizing plate 24, a retardation plate and other optical elements can be provided on the outer surface side of the counter substrate 20. A backlight (illumination device) 90 including a light guide plate 91 and a reflection plate 92 is disposed on the back side (the lower side in the drawing) of the TFT array substrate 10.

As shown in FIG. 2A, in the sub-pixel region of the liquid crystal device 100, a pixel electrode (first electrode) 9 that is substantially ladder-shaped in plan view and that is long in the Y-axis direction, and the pixel electrode 9 in plan view are formed. There is provided a common electrode (second electrode) 19 having a substantially flat surface disposed in an overlapping manner. A columnar spacer 40 is erected at the upper left corner of the sub-pixel region in the drawing to hold the TFT array substrate 10 and the counter substrate 20 at a predetermined interval.
The pixel electrode 9 includes a plurality of (in the figure, 15) strip-shaped electrodes 9c extending substantially in the X-axis direction, and a frame body portion 9a having a substantially rectangular frame shape in plan view connected to both ends of the strip-shaped electrodes 9c. The plurality of strip electrodes 9c are arranged in the Y-axis direction at equal intervals in parallel to each other.

  The common electrode 19 has a flat solid shape in the pixel region shown in FIG. 2, and a strip-like reflective polarizing layer 29 extending in the X-axis direction is formed at a position partially overlapping with the common electrode 19 in the sub-pixel region. Is formed. In the liquid crystal device 100 according to the present embodiment, a region where the formation region of the reflective polarizing layer 29 and a planar region including the pixel electrode 9 overlap in one subpixel region shown in FIG. The reflective display region R is configured to reflect and modulate light that is incident from the outside and transmits through the liquid crystal layer 50. In addition, the region where the reflective polarizing layer 29 is not formed and the region where the common electrode 19 is formed and the region including the pixel electrode 9 overlaps the light that is incident from the backlight 90 and passes through the liquid crystal layer 50. Thus, a transmissive display area T is displayed.

  In the case of the present embodiment, the common electrode 19 is a conductive film made of a transparent conductive material such as ITO (indium tin oxide), and the reflective polarizing layer 29 is a light reflection having a fine slit structure, as will be described in detail later. A reflective polarizing layer made of a conductive metal film. The reflective polarizing layer 29 has a strip shape extending in the X-axis direction in the entire image display region in which a large number of sub-pixels are arranged in a matrix in plan view, and the formation region of the reflective polarizing layer 29 is related to the Y-axis direction. The non-formation regions are arranged alternately.

  In the sub-pixel region shown in FIG. 2A, a data line 6a extending in the X-axis direction, a scanning line 3a extending in the Y-axis direction, and a capacitor line 3b extending in parallel with the scanning line 3a adjacent to the scanning line 3a. And are formed. A TFT 30 is provided in the vicinity of the intersection of the data line 6a and the scanning line 3a. The TFT 30 includes a semiconductor layer 35 made of amorphous silicon partially formed in a planar region of the scanning line 3a, a source electrode 6b formed partially overlapping the semiconductor layer 35, and a drain electrode 32. ing. The scanning line 3 a functions as a gate electrode of the TFT 30 at a position overlapping the semiconductor layer 35 in plan view.

The source electrode 6b of the TFT 30 is formed in a substantially inverted L shape in plan view extending from the data line 6a and extending to the semiconductor layer 35, and the drain electrode 32 is substantially rectangular in plan view at the end extending to the −Y side. The capacitor electrode 31 is electrically connected. On the capacitor electrode 31, the pixel electrode 9 is arranged extending from the central portion side of the sub-pixel, and a pixel contact hole 45 is provided at a position where they both overlap in a plane. The capacitor electrode 31 and the pixel electrode 9 are electrically connected through the pixel contact hole 45.
The capacitor electrode 31 is disposed in the planar region of the capacitor line 3b, and a storage capacitor 70 is formed using the capacitor electrode 31 and the capacitor line 3b that are opposed in the thickness direction as electrodes.

  Looking at the cross-sectional structure shown in FIG. 3, the liquid crystal layer 50 is sandwiched between the TFT array substrate 10 and the counter substrate 20 that are arranged to face each other. The TFT array substrate 10 has a translucent substrate body 10A made of glass, quartz, plastic, or the like as a base, and scanning lines 3a and capacitance lines 3b are formed on the inner surface side (the liquid crystal layer 50 side) of the substrate body 10A. A gate insulating film 11 made of a transparent insulating film such as silicon oxide is formed so as to cover the scanning lines 3a and the capacitor lines 3b.

  An amorphous silicon semiconductor layer 35 is formed on the gate insulating film 11, and a source electrode 6 b and a drain electrode 32 are provided so as to partially run over the semiconductor layer 35. A capacitor electrode 31 is integrally formed on the drain electrode 32 on the pixel contact hole 45 side. The semiconductor layer 35 is opposed to the scanning line 3 a via the gate insulating film 11, and the scanning line 3 a constitutes the gate electrode of the TFT 30 in the opposed region. The capacitor electrode 31 is opposed to the capacitor line 3b through the gate insulating film 11, and a storage capacitor 70 having the gate insulating film 11 as a dielectric film is provided in a region where the capacitor electrode 31 and the capacitor line 3b are opposed to each other. Is formed.

  A first interlayer insulating film 12 made of silicon oxide or the like is formed so as to cover the semiconductor layer 35, the source electrode 6 b, the drain electrode 32, and the capacitor electrode 31. A scattering imparting layer 39 made of a resin material such as an acrylic resin is partially formed on the first interlayer insulating film 12, and aluminum or the like is formed on the surface on which the uneven shape of the scattering imparting layer 39 is formed. A reflective polarizing layer 29 made of a metal film having light reflectivity is formed. A flat solid common electrode 19 made of a transparent conductive material such as ITO is formed in a region on the first interlayer insulating film 12 including the surface of the reflective polarizing layer 29.

Here, FIG. 4 is a diagram for explaining the configuration and operation of the reflective polarizing layer 29, FIG. 4A is a plan configuration diagram of the reflective polarizing layer 29, and FIG. 4B is the diagram of FIG. It is a side block diagram which follows the JJ 'line.
As shown in FIGS. 4A and 4B, the reflective polarizing layer 29 is mainly composed of a light-reflective metal film 71 such as aluminum, and forms a stripe shape in plan view with a predetermined pitch. It has a configuration in which a plurality of fine slits 72 are formed. The plurality of slits 72 are formed in parallel with each other and have the same width. The width of the slit 72 is about 30 nm to 300 nm, and the line width of the metal film 71 that is linear as a result of the formation of the plurality of slits 72 at a predetermined pitch is about 30 nm to 300 nm.

  As shown in FIG. 4B, when the light (natural light) E is incident from the upper surface side of the reflective polarizing layer 29 having the above configuration, the polarized light component parallel to the length direction of the slit 72 is reflected light. A polarized light component reflected as Er and parallel to the width direction of the slit 72 is transmitted as transmitted light Et. That is, the reflective polarizing layer 29 has a reflection axis parallel to the extending direction of the slit 72 and a transmission axis in a direction perpendicular to the reflection axis.

  For example, the scattering imparting layer 39 may be formed by applying a liquid resin material to form a resin layer, and then pressing a transfer mold having a concavo-convex shape on the surface of the resin layer. A method of forming by exposing the surface of the resin layer non-uniformly by half exposure and developing, or forming a plurality of island-shaped protrusions on the surface of the first interlayer insulating film 12 so as to cover the protrusions It can be formed by applying a resin material to form a resin layer having a concavo-convex shape following the projection on the surface. By such a scattering imparting layer 39 having a concavo-convex shape on the surface, the reflective polarizing layer 29 formed on the surface is also provided with a shape that follows the irregularities on the surface of the scattering imparting layer 39, and is provided with a light scattering means. It becomes a polarizing layer.

  As in the present embodiment, the configuration in which the common electrode 19 is formed so as to cover the reflective polarizing layer 29 allows the reflective polarizing layer 29 made of a metal film having a fine slit-shaped opening to be replaced with other constituent members. Since it can protect from the etching liquid at the time of patterning, the characteristic deterioration of the reflective polarizing layer 29 in which shape control is important can be prevented. Further, since the pixel electrode 9 faces only the common electrode 19 made of ITO or the like, the electric field generated between the pixel electrode 9 and the common electrode 19 can be made uniform in the sub-pixel region.

  A second interlayer insulating film 13 made of silicon oxide or the like is formed so as to cover the common electrode 19, and a pixel electrode 9 made of a transparent conductive material such as ITO is patterned on the second interlayer insulating film 13. A pixel contact hole 45 reaching the capacitor electrode 31 through the first interlayer insulating film 12 and the second interlayer insulating film 13 is formed, and a part of the pixel electrode 9 is buried in the pixel contact hole 45, The pixel electrode 9 and the capacitor electrode 31 are electrically connected. The common electrode 19 is also provided with an opening corresponding to the region where the pixel contact hole 45 is formed, so that the common electrode 19 and the pixel electrode 9 are not in contact with each other. An alignment film 18 made of polyimide or the like is formed in a region on the second interlayer insulating film 13 covering the pixel electrode 9.

  On the other hand, the color filter 22 and the alignment film 28 are laminated on the inner surface side (the liquid crystal layer 50 side) of the counter substrate 20. The color filter 22 is preferably configured to be divided into two types of regions having different chromaticities within the sub-pixel region. To give a specific example, the first color material region corresponds to the transmissive display region T. The second color material region is provided corresponding to the reflective display region R (reflective polarizing layer 29), and the chromaticity of the first color material region is higher than the chromaticity of the second color material region. A large structure can be adopted. By adopting such a configuration, it is possible to prevent the chromaticity of the display light from being different between the transmissive display region T where the display light is transmitted only once through the color filter 22 and the reflective display region R where the display light is transmitted twice. The display quality can be improved by making the reflection display and the transmission display look the same.

  2B, in the liquid crystal device 100, the reflective polarizing layer 29 has a transmission axis (a direction orthogonal to the extending direction of the slit 72) 157 in the counter substrate 20. The polarizing plate 24 is disposed in parallel with the transmission axis 153 of the polarizing plate 24 on the side, and is disposed in a direction orthogonal to the transmission axis of the polarizing plate 14 on the TFT array substrate 10 side. The alignment films 18 and 28 are rubbed in the same direction in plan view, and the direction is a rubbing direction 151 shown in FIG. Therefore, the transmission axis 157 of the reflective polarizing layer 29 and the rubbing direction 151 of the alignment films 18 and 28 are arranged in parallel. The rubbing direction 151 is parallel to the X-axis direction of FIG. 2 and is an angle that forms an angle of about 10 ° to 30 ° with respect to the extending direction of the strip electrode 9c of the pixel electrode 9.

The liquid crystal device 100 having the above-described configuration is an FFS liquid crystal device, and an image signal (voltage) is applied to the pixel electrode 9 through the TFT 30 so that the substrate surface is interposed between the pixel electrode 9 and the common electrode 19. An electric field in the direction is generated, the liquid crystal is driven by the electric field, and image display is performed by changing the transmittance / reflectance for each sub-pixel. As shown in FIG. 2B, since the alignment films 18 and 28 facing each other with the liquid crystal layer 50 interposed therebetween are rubbed in the same direction in plan view, in a state where no voltage is applied to the pixel electrode 9, Liquid crystal molecules constituting the liquid crystal layer 50 are horizontally aligned between the substrates 10 and 20 along the rubbing direction 151. When an electric field formed between the pixel electrode 9 and the common electrode 19 is applied to such a liquid crystal layer 50, the liquid crystal molecules are aligned along the line width direction of the strip electrode 9c shown in FIG. . The liquid crystal device 100 performs bright and dark display using birefringence based on the difference in the alignment state of liquid crystal molecules.
The common electrode 19 only needs to be held at a constant voltage so as to generate a potential difference within a predetermined range with the pixel electrode 9 during the operation of the liquid crystal device 100, but is synchronized with the scanning pulse input to the scanning line 3a. A pulse signal may be input.

  Next, the operation of the liquid crystal device 100 having the above configuration will be described with reference to FIG. FIG. 5 is an operation explanatory diagram of the liquid crystal device 100. In FIG. 3, only the components necessary for the description are extracted from the components shown in FIG. 3, and the polarizing plate 24, the liquid crystal layer 50, the common electrode 19, and the polarizing plate are sequentially shown from the upper side of the drawing. 14 and a backlight 90 are shown.

First, the transmissive display (transmission mode) on the right side of FIG. 5 will be described.
In the liquid crystal device 100, the light emitted from the backlight 90 passes through the polarizing plate 14, is converted into linearly polarized light parallel to the transmission axis 155 of the polarizing plate 14, and enters the common electrode 19. The light passes through and enters the liquid crystal layer 50. If the liquid crystal layer 50 is in an on state (a selection voltage is applied between the pixel electrode 9 and the common electrode 19), the incident light has a predetermined phase difference (λ / 2) by the liquid crystal layer 50. And is converted into linearly polarized light parallel to the transmission axis 153 of the polarizing plate 24. Thereby, the light transmitted through the polarizing plate 24 is visually recognized as display light, and the sub-pixel is brightly displayed.

On the other hand, if the liquid crystal layer 50 is in an off state (a state where the selection voltage is not applied), incident light reaches the polarizing plate 24 while maintaining its polarization state, and an absorption axis (transmission axis) parallel to the incident light. Is absorbed by the polarizing plate 24 having an optical axis orthogonal to 153, and the sub-pixel is darkly displayed.
Note that the light that has passed through the polarizing plate 14 and entered the reflective polarizing layer 29 is reflected by the reflective polarizing layer 29 having a reflection axis parallel to the linearly polarized light, so that the backlight 90 does not enter the liquid crystal layer 50. Back to the side.

Next, the reflective display on the left side of FIG. 5 will be described.
In the reflective display, light incident from above (outside) the polarizing plate 24 is transmitted through the polarizing plate 24 to be converted into linearly polarized light parallel to the transmission axis 153 of the polarizing plate 24 and is incident on the liquid crystal layer 50. At this time, if the liquid crystal layer 50 is in an on state, the incident light is given a predetermined phase difference (λ / 2) by the liquid crystal layer 50 and enters the reflective polarizing layer 29. As shown in FIG. 2B, the reflective polarizing layer 29 has a transmission axis 157 parallel to the transmission axis 153 of the polarizing plate 14 and a reflection axis orthogonal to the transmission axis 153. The light transmitted through 50 and incident on the reflective polarizing layer 29 is reflected while maintaining its polarization state. At this time, the reflected light is scattered by the uneven shape imparted to the reflective polarizing layer 29 itself. Thereafter, the reflected light reentering the liquid crystal layer 50 is returned to the polarization state at the time of incidence (linearly polarized light parallel to the transmission axis of the polarizing plate 24) by the action of the liquid crystal layer 50 and enters the polarizing plate 24. As a result, the reflected light transmitted through the polarizing plate 24 is visually recognized as display light, and the sub-pixel is brightly displayed. In addition, since the reflected light that becomes the display light is scattered by the reflective polarizing layer 29, it is possible to prevent the regular reflection of external light and to achieve a reflective display with excellent visibility.

  On the other hand, if the liquid crystal layer 50 is in the off state, the light incident on the liquid crystal layer 50 from the polarizing plate 24 enters the reflective polarizing layer 29 while maintaining the polarization state, and has a transmission axis 157 parallel to the light. The reflective polarizing layer 29 is transmitted. Then, the light is absorbed by the polarizing plate 14 having an absorption axis parallel to the light, and the sub-pixel is darkly displayed.

  Here, FIG. 6 is an operation explanatory diagram of the liquid crystal device 1000 having a configuration in which a metal reflective film 190 such as aluminum is partially provided in the sub-pixel region in the FFS mode liquid crystal device. That is, the liquid crystal device 1000 is a combination of an FFS type liquid crystal device and a conventionally known transflective liquid crystal device, and the formation region of the metal reflective film 190 in the sub-pixel region is used as a reflective display region. In this configuration, it is assumed that the formation region of the opening 190t formed in the metal reflective film 190 is a transmissive display region.

  As shown in FIG. 6, the liquid crystal device 1000 can perform bright and dark display similar to the liquid crystal device 100 according to the embodiment in the transmissive display. However, in the reflective display, the display is bright regardless of whether the liquid crystal layer 50 is on or off, and cannot be displayed normally. In the liquid crystal device 1000, a retardation plate (λ / 4 plate) may be provided between the polarizing plate 24 and the liquid crystal layer 50 so that circularly polarized light is incident on the liquid crystal layer 50 during reflection display. In the horizontal electric field type liquid crystal device that is aligned in parallel, the phase difference value of the liquid crystal layer 50 is not changed by the electric field response as in the conventional vertical electric field method, but the in-plane direction of the optical axis of the liquid crystal layer 50 is changed. Therefore, it is difficult to apply such a circular polarization mode in order to realize high display quality. In the case of circularly polarized light, when the phase difference provided by the liquid crystal layer 50 is approximately λ / 2, the liquid crystal layer 50 is emitted from the liquid crystal layer 50 in the same polarization state without depending on the direction of the optical axis. It is. In addition, when the phase difference provided by the liquid crystal layer 50 is other than approximately λ / 2, it is difficult to achieve both high display quality in reflective display and transmissive display.

  As the transflective liquid crystal device, a so-called multi-gap transflective liquid crystal device in which the liquid crystal layer thickness of the reflective display region is about half of the liquid crystal layer thickness of the transmissive display region is also known. In a horizontal electric field type liquid crystal device, the driving voltage varies greatly depending on the thickness of the liquid crystal layer, so even if a multi-gap structure is applied, display quality deterioration due to the driving voltage difference between the reflective display area and the transmissive display area can be avoided. Therefore, it is difficult to obtain a high-quality transflective display.

  In contrast, the liquid crystal device 100 according to the present embodiment employs a configuration in which the reflective polarizing layer 29 is partially provided in the sub-pixel region, so that a high contrast can be achieved without using a circular polarization mode or a multi-gap structure. Reflective display and transmissive display can be obtained, and a high-quality transflective liquid crystal device with high image quality can be realized with a simple configuration. Moreover, since the uneven shape which is a light-scattering means is provided to the reflective polarizing layer 29, the reflective display excellent in visibility can be obtained. Furthermore, since the liquid crystal layer thickness in the sub-pixel region is constant, there is no difference in driving voltage between the transmissive display region T and the reflective display region R, and the display state differs between the reflective display and the transmissive display. There is nothing.

  In the liquid crystal device 100 of the present embodiment, the reflective polarizing layer 29 for performing the reflective display is provided on the TFT array substrate 10 side. It is possible to effectively prevent the display quality from being deteriorated due to the reflected light and the glare of the reflected light. Furthermore, since the pixel electrode 9 is formed using a transparent conductive material, it is possible to prevent external light that has passed through the liquid crystal layer 50 and entered the TFT array substrate 10 from being reflected by the pixel electrode 9, and The aperture ratio can also be improved. Thereby, a bright and excellent display can be obtained.

  The reflective polarizing layer 29 used in this embodiment can be formed narrowly because it can be accurately formed by forming an aluminum film on the interlayer insulating film 12 and then patterning the aluminum film using a photolithography technique. It can also be suitably used for a high-definition liquid crystal device having a sub-pixel region.

(Second Embodiment)
Next, a liquid crystal device 200 according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 7 is a plan configuration diagram showing an arbitrary one sub-pixel region in the liquid crystal device 200 of the present embodiment. FIG. 8 is a cross-sectional configuration diagram taken along the line BB ′ of FIG. FIG. 7 is a diagram corresponding to FIG. 2A in the first embodiment, and FIG. 8 is a diagram corresponding to FIG. 3 in the first embodiment.
In each drawing referred to in the present embodiment, the same components as those in the liquid crystal device 100 according to the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals. Detailed description is omitted.

  As shown in FIG. 7, in the sub-pixel region of the liquid crystal device 200, scanning lines 3a and capacitor lines 3b extending in the X-axis direction and data lines 6a extending in the Y-axis direction are formed. A pixel electrode 9 having a substantially ladder shape in plan view is formed in the enclosed rectangular region. Further, a flat solid common electrode 19 is formed between the pixel electrode 9 and an electric field is generated. The TFT 30 formed in the vicinity of the intersection of the scanning line 3a and the data line 6a is electrically connected to the capacitor electrode 31 via the drain electrode 32, and the capacitor electrode 31 is formed in the pixel contact hole 45 formed in the plane region. Is electrically connected to the pixel electrode 9 via A reflective polarizing layer 49 having a substantially ladder shape in plan view similar to that of the pixel electrode 9 is formed at a position overlapping the pixel electrode 9 in plan view. Similar to the reflective polarizing layer 29 according to the first embodiment, the reflective polarizing layer 49 is made of a metal film in which a plurality of fine slit-shaped openings are formed.

  In the case of this embodiment, the reflective polarizing layer 49 is formed so as to overlap the pixel electrode 9 in a planar manner, and the superposed region constitutes a reflective display region of the sub-pixel region. Further, the parallelogram-shaped openings formed between the strip electrodes 9c of the pixel electrode 9 serve as a transmissive display region in which the light from the backlight 90 is transmitted to perform display.

  In the cross-sectional structure shown in FIG. 8, the liquid crystal layer 50 is sandwiched between the TFT array substrate 10 and the counter substrate 20, and the backlight 90 is disposed on the back side of the TFT array substrate 10. A TFT 30 and a first interlayer insulating film 12 covering the TFT 30 are formed on the inner surface side of the TFT array substrate 10, and a flat solid common electrode 19 is formed on the first interlayer insulating film 12. In the case of the present embodiment, a concavo-convex shape is formed in a partial region of the surface of the first interlayer insulating film 12 (a region overlapping at least the region including the pixel electrode 9), and the first shape having such a surface shape is formed. The common electrode 19 formed on the interlayer insulating film 12 has an uneven shape following the surface of the first interlayer insulating film 12.

  A second interlayer insulating film 13 is formed so as to cover the common electrode 19, and a reflective polarizing layer 49 having a substantially ladder shape in plan view is formed on the second interlayer insulating film 13. A pixel electrode 9 made of a transparent conductive material such as ITO is formed covering the reflective polarizing layer 49 made of a metal film such as aluminum. As described above, since the common electrode 19 in the region where the pixel electrode 9 is formed is provided with an uneven shape, the surface of the common electrode 19 is also formed on the second interlayer insulating film 13 formed on the common electrode 19. A concave / convex shape following the shape is given, and the reflective polarizing layer 49 formed on the second interlayer insulating film 13 is also given a concave / convex shape following the surface shape of the second interlayer insulating film 13. With such a configuration, the surface of the reflective polarizing layer 49 becomes an uneven surface, and a reflective layer having light scattering properties is configured.

  A part of the pixel electrode 9 is buried in the pixel contact hole 45 that penetrates the first interlayer insulating film 12 and the second interlayer insulating film 13 and reaches the capacitor electrode 31, and the TFT 30 and the pixel electrode are formed by this contact structure. 9 (reflective polarizing layer 49) is electrically connected. An alignment film 18 is formed so as to cover the pixel electrode 9. Note that the configuration of the counter substrate 20 is the same as that of the liquid crystal device 100 according to the first embodiment.

  The optical axis arrangement of the liquid crystal device 200 of this embodiment is the same as the optical axis arrangement of the liquid crystal device 100 shown in FIG. 2B, and the transmission axis of the polarizing plate 14 is arranged parallel to the Y-axis direction of FIG. The transmission axis of the polarizing plate 24 of the counter substrate 20 is arranged parallel to the Y-axis direction. The rubbing direction of the alignment films 18 and 28 and the transmission axis of the reflective polarizing layer 49 are parallel to the transmission axis of the polarizing plate 24.

  The operation of the liquid crystal device 200 having the above configuration is the same as that of the liquid crystal device 100 of the first embodiment. The liquid crystal device according to the present embodiment can obtain a high-contrast reflective display and a transmissive display without using a circular polarization mode or a multi-gap structure. An apparatus can be realized. In addition, since the reflective polarizing layer 49 is provided with a concavo-convex shape and includes a light scattering means, a reflective display with excellent visibility can be obtained. Furthermore, since the liquid crystal layer thickness in the sub-pixel region is constant, there is no difference in driving voltage between the transmissive display region T and the reflective display region R, and the display state differs between the reflective display and the transmissive display. There is nothing.

  In addition, since the reflective polarizing layer 49 for performing the reflective display is provided on the TFT array substrate 10 side, external light is reflected by the metal wiring or the like formed on the TFT array substrate 10 together with the TFT 30, and the reflected light It is possible to effectively prevent display quality from being deteriorated due to glare. In this embodiment, the reflective polarizing layer 49 that is easily eroded by a solvent or the like is disposed in the vicinity of the liquid crystal layer 50, but the reflective polarizing layer 49 is covered and protected by the pixel electrode 9.

  Furthermore, in this embodiment, since the reflective polarizing layer 49 is provided at a position overlapping the pixel electrode 9 in a plan view, an effect of improving display characteristics in both transmissive display and reflective display can be obtained. Since the electric field for driving the liquid crystal is mainly formed near the edge of the pixel electrode 9 between the pixel electrode 9 and the common electrode 19, disclination is likely to occur in the planar region of the pixel electrode 9. For this reason, when the formation region of the pixel electrode 9 is used as a transmissive display region, the contrast is reduced due to light scattering caused by the disclination. On the other hand, in the liquid crystal device 200 of this embodiment, the reflective display layer 49 can be prevented from being deteriorated by disposing the reflective polarizing layer 49 at a position overlapping the pixel electrode 9.

(Third embodiment)
Next, a liquid crystal device 300 according to a third embodiment of the present invention will be described with reference to FIGS.
FIG. 9 is a plan configuration diagram showing an arbitrary one sub-pixel region in the liquid crystal device 300 of the present embodiment. 10 is a cross-sectional configuration diagram taken along the line DD ′ of FIG. FIG. 9 is a diagram corresponding to FIG. 2A in the first embodiment, and FIG. 10 is a diagram corresponding to FIG. 3 in the first embodiment.
In each drawing referred to in the present embodiment, the same components as those in the liquid crystal device 100 according to the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals. Detailed description is omitted.

As shown in FIG. 9, in the sub-pixel region of the liquid crystal device 300, scanning lines 3a and capacitance lines 3b extending in the X-axis direction and data lines 6a extending in the Y-axis direction are formed. A pixel electrode 9 having a substantially ladder shape in plan view is formed in the enclosed rectangular region. In addition, a strip-shaped common electrode 59 that generates an electric field between the pixel electrode 9 and the reflective polarizing layer 29 is formed so that the formation region of the pixel electrode 9 is divided into two in the Y-axis direction. The common electrode 59 and the reflective polarizing layer 29 have a strip shape extending in the X-axis direction in the entire display region, and at least the common electrode 59 and the reflective polarizing layer 29 disposed in the same sub-pixel region are electrically connected. It is connected. The TFT 30 formed in the vicinity of the intersection of the scanning line 3a and the data line 6a is electrically connected to the capacitor electrode 31 via the drain electrode 32, and the capacitor electrode 31 is formed in the planar region of the pixel contact hole 55. Is electrically connected to the pixel electrode 9 via
In the present embodiment, in the sub-pixel region, the formation region of the common electrode 59 substantially corresponds to the transmissive display region T, and the formation region of the reflective polarizing layer 29 generally constitutes the reflective display region R.

  Looking at the cross-sectional structure shown in FIG. 10, the liquid crystal layer 50 is sandwiched between the TFT array substrate 10 and the counter substrate 20, and the backlight 90 is disposed on the back side of the TFT array substrate 10. On the inner surface side of the TFT array substrate 10, scanning lines 3a and capacitance lines 3b are formed, and a common electrode 59 and a reflective polarizing layer 29 are formed in the same layer (substrate body 10A surface). . A first interlayer insulating film 12 is formed so as to cover the scanning lines 3 a, the capacitor lines 3 b, the common electrode 59, and the reflective polarizing layer 29. A semiconductor layer 35 is formed on the first interlayer insulating film 12 at a position facing the scanning line 3a, and a source electrode 6b and a drain electrode 32 are formed so as to partially run over the semiconductor layer 35. Therefore, in the liquid crystal device 300, the first interlayer insulating film 12 functions also as a gate insulating film of the TFT 30.

  A second interlayer insulating film 13 covering the semiconductor layer 35, the source electrode 6 b, and the drain electrode 32 is formed on the first interlayer insulating film 12, and the pixel electrode 9 is patterned on the second interlayer insulating film 13. The pixel electrode 9 is electrically connected to the capacitor electrode 31 (drain electrode 32, semiconductor layer 35) through a pixel contact hole 55 that passes through the second interlayer insulating film 13 and reaches the capacitor electrode 31.

  In this embodiment, a light scattering layer (light scattering means) 26 is formed on the inner surface side of the counter substrate 20 at a position facing the reflective polarizing layer 29 of the TFT array substrate 10. A color filter 22 is formed so as to cover it. As the light scattering layer 26, for example, a resin matrix in which transparent beads having different refractive indexes are dispersed can be used. In this embodiment, the color filter 22 in the reflective display region R is formed by reducing the thickness of the color filter 22 by the thickness of the light scattering layer 26 partially provided on the substrate body 20A. The chromaticity can be made lower than the chromaticity in the transmissive display area T. Thereby, it is possible to prevent the chromaticity of the display light from being different between the reflective display region R in which the light as the display light is transmitted through the color filter 22 twice and the transmissive display region T in which the light is transmitted only once. In the present embodiment, the light scattering layer 26 is made of a color material, and may constitute a part of the color filter 22.

  The operation of the liquid crystal device 300 having the above configuration is the same as that of the liquid crystal device 100 of the first embodiment. The liquid crystal device according to the present embodiment can obtain a high-contrast reflective display and a transmissive display without using a circular polarization mode or a multi-gap structure. An apparatus can be realized. Further, since the light scattering layer 26 serving as the light scattering means is provided corresponding to the planar region of the reflective polarizing layer 29, a reflective display with excellent visibility can be obtained. Furthermore, since the liquid crystal layer thickness in the sub-pixel region is constant, there is no difference in driving voltage between the transmissive display region T and the reflective display region R, and the display state differs between the reflective display and the transmissive display. There is nothing.

In the present embodiment, the configuration in which the light scattering layer 26 is provided on the counter substrate 20 side has been described. However, the light scattering layer 26 may be provided on the TFT array substrate 10 side as long as it is on the reflective polarizing layer 29. For example, it may be provided between the reflective polarizing layer 29 and the first interlayer insulating film 12 or between the second interlayer insulating film 13 and the pixel electrode 9.
Further, as in the first and second embodiments, the reflective polarizing layer 29 can be provided with a concavo-convex shape to form a light scattering means. In this case, a scattering property imparting layer having the same configuration as the scattering property imparting layer 39 described above may be provided between the reflective polarizing layer 29 and the substrate body 10A, and an uneven shape is directly formed on the surface of the substrate body 10A. May be. As a means for selectively forming an uneven surface on the substrate body 10A made of glass or the like, a selective frost process or a blast process using a mask can be used.

(Electronics)
Next, the electronic apparatus of the present invention will be described. FIG. 11 is a perspective view showing a mobile phone as an example of an electronic apparatus according to the invention. This cellular phone 1300 includes the liquid crystal display device of the present invention as a small-sized display portion 1301 and includes a plurality of operation buttons 1302, a mouthpiece 1303, and a mouthpiece 1304. Since the electronic apparatus includes the liquid crystal device according to the above-described embodiment, high-quality display is possible in both the transmission mode and the reflection mode.

  The liquid crystal device of the above embodiment is not limited to the mobile phone, but is an electronic book, a personal computer, a digital still camera, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic device. It can be suitably used as an image display means for devices such as notebooks, calculators, word processors, workstations, videophones, POS terminals, touch panels, etc. In any electronic device, it is bright, has high contrast, and has a wide field of view. Corner transmission / reflection display is possible.

1 is a circuit configuration diagram of a liquid crystal device according to a first embodiment. FIG. 6 is a plan configuration diagram and an optical axis arrangement diagram of one sub-pixel region. FIG. 3 is a cross-sectional configuration diagram taken along the line A-A ′ of FIG. The plane block diagram and cross-sectional block diagram for demonstrating a reflective polarizing layer. FIG. 3 is an operation explanatory diagram of the liquid crystal device of the first embodiment. FIG. 9 is an operation explanatory diagram of a liquid crystal device shown as a comparative example. FIG. 6 is a plan configuration diagram in a sub-pixel region of a liquid crystal device according to a second embodiment. FIG. 8 is a cross-sectional configuration diagram taken along line B-B ′ of FIG. 7. FIG. 10 is a plan configuration diagram in a sub-pixel region of a liquid crystal device according to a third embodiment. FIG. 10 is a cross-sectional configuration diagram taken along line D-D ′ in FIG. 9. FIG. 11 is a perspective configuration diagram illustrating an example of an electronic device.

Explanation of symbols

  100, 200, 300 Liquid crystal device, 10 TFT array substrate (first substrate), 20 Counter substrate (second substrate), 9 Pixel electrode (first electrode), 19, 59 Common electrode (second electrode), 29, 49 Reflective polarizing layer, 30 TFT (switching element), 26 Light scattering layer (light scattering means), 39 Scattering imparting layer

Claims (10)

  1. A first substrate and a second substrate that are opposed to each other with a liquid crystal layer interposed therebetween, and a reflective display region and a transmissive display region are provided in one pixel region, and a plurality of electrodes electrically connected to each other are provided in the pixel region. A first electrode having a strip-shaped electrode, a second electrode which is provided on the first substrate side with respect to the first electrode and generates an electric field between the first electrode, and the first electrode and the second electrode A transflective liquid crystal device provided with an interlayer insulating film interposed therebetween,
    In the reflective display area, a reflective polarizing layer that selectively reflects light of a predetermined polarization component of incident light and a light scattering means that scatters light reflected by the reflective polarizing layer are provided. A liquid crystal device characterized by the above.
  2.   2. The liquid crystal device according to claim 1, wherein the second electrode is formed so as to cover the reflective polarizing layer made of a metal film having a plurality of fine slit-shaped openings. 3.
  3.   The first electrode and the interlayer insulating film are in a region where they overlap in a plane, and are made of a metal film in which a plurality of fine slit-shaped openings are provided between the first electrode and the interlayer insulating film. The liquid crystal device according to claim 1, wherein the reflective polarizing layer is formed.
  4. A switching element electrically connected to the first electrode and a conductive wiring electrically connected to the switching element are provided on the liquid crystal layer side of the first substrate,
    The reflective polarizing layer made of a metal film provided with a plurality of fine slit-shaped openings is provided with the conductive wiring, or between the layer provided with the conductive wiring and the first substrate. The liquid crystal device according to claim 1, wherein the liquid crystal device is provided.
  5.   The liquid crystal device according to claim 4, wherein the reflective polarizing layer is formed on the liquid crystal layer side of the first substrate.
  6. The switching element has a structure in which a conductive film, an element insulating film, and a conductive film are stacked,
    6. The liquid crystal according to claim 4, wherein the interlayer insulating film interposed between the first electrode and the second electrode is an insulating film having the same layer and the same thickness as the element insulating film. apparatus.
  7.   5. The interlayer insulating film includes a first insulating film having the same layer and thickness as the element insulating film, and a second insulating film laminated with the first insulating film. Or 5. The liquid crystal device according to 5.
  8.   An uneven surface that imparts a light-scattering uneven shape to the reflective polarizing layer is formed in a region overlapping the reflective polarizing layer on the liquid crystal layer side of the first substrate in a plane. 8. The liquid crystal device according to any one of 1 to 7.
  9.   The scattering property providing layer which provides the light-scattering uneven | corrugated shape to the said reflective polarizing layer between the said reflective polarizing layer and the said 1st board | substrate is provided. 2. A liquid crystal device according to item 1.
  10.   An electronic apparatus comprising the liquid crystal device according to claim 1.
JP2005328441A 2005-11-14 2005-11-14 Liquid crystal device and electronic apparatus Withdrawn JP2007133294A (en)

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