JP4686980B2 - Liquid crystal device and electronic device - Google Patents

Liquid crystal device and electronic device Download PDF

Info

Publication number
JP4686980B2
JP4686980B2 JP2004022255A JP2004022255A JP4686980B2 JP 4686980 B2 JP4686980 B2 JP 4686980B2 JP 2004022255 A JP2004022255 A JP 2004022255A JP 2004022255 A JP2004022255 A JP 2004022255A JP 4686980 B2 JP4686980 B2 JP 4686980B2
Authority
JP
Japan
Prior art keywords
liquid crystal
wiring
pixel electrode
electrode
portion
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
JP2004022255A
Other languages
Japanese (ja)
Other versions
JP2005215352A (en
Inventor
正寛 堀口
小織 永崎
英樹 金子
Original Assignee
セイコーエプソン株式会社
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
Application filed by セイコーエプソン株式会社 filed Critical セイコーエプソン株式会社
Priority to JP2004022255A priority Critical patent/JP4686980B2/en
Publication of JP2005215352A publication Critical patent/JP2005215352A/en
Application granted granted Critical
Publication of JP4686980B2 publication Critical patent/JP4686980B2/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Description

  The present invention relates to a so-called vertical alignment type liquid crystal device, and more particularly to a wiring method between an active element and a pixel electrode.

  2. Description of the Related Art A vertical alignment type liquid crystal device is known in which viewing angle dependency is improved by controlling the alignment of liquid crystal molecules and a wide viewing angle is achieved. In a vertical alignment type liquid crystal device, a liquid crystal having a negative dielectric anisotropy is used, and in a state where no voltage is applied between the element substrate and the counter substrate, the liquid crystal molecules are substantially perpendicular to the substrate. Oriented in the direction. A substantially circular or polygonal pixel electrode is formed on an element substrate provided with TFTs and TFDs as active elements. In the counter substrate, a slit or a convex portion is formed at a position facing substantially the center of the pixel electrode. When a voltage is applied between the element substrate and the counter substrate, an electric field corresponding to the voltage is formed in the liquid crystal layer between the substrates, but the pixel electrode is formed in a substantially circular or polygonal shape, and Since the opposing electrode on the opposite substrate side is formed with slits, protrusions, and the like, the alignment state of the liquid crystal molecules is controlled radially around the approximate center of the pixel electrode. Thereby, the viewing angle dependency is suppressed, and a wide viewing angle can be achieved. Examples of vertical alignment type liquid crystal display devices are described in Patent Documents 1 and 2.

  However, in the vertical alignment type liquid crystal display device, depending on the shape of the portion where the wiring from the active element is connected to the pixel electrode, the alignment control of the liquid crystal is disturbed at that portion, and the response speed to the drive control is reduced. Problems such as unevenness may occur.

JP 2002-202511 A JP 2003-43525 A

  The present invention has been made in view of the above-described problems, and prevents vertical alignment control at a connection portion between an active element and a pixel electrode, and can perform high-definition display. It is an object to provide an electronic device using the same.

In one aspect of the present invention, in a liquid crystal device having a liquid crystal layer sandwiched between a pair of substrates, the major axis direction of the liquid crystal molecules in the liquid crystal layer is aligned substantially perpendicular to the substrate when no voltage is applied. and it, a plurality of pixels on one of the pair of substrates are formed, each said pixel comprises an active element, a pixel electrode, a wiring and for connecting the pixel electrode and the active element, the pixel The electrode has a plurality of polygonal or substantially circular unit electrodes arranged in series, and the wiring is electrically connected to a protruding portion protruding outward from one of the plurality of unit electrodes. The wiring is connected to the unit electrode in the length direction substantially perpendicular to the tangent of the polygonal outer edge of the unit electrode or the tangent of the substantially circular circumferential portion, and The part overlaps the protruding part Ri, and the wiring is not present in the unit electrodes.

The above-described liquid crystal device is preferably configured as a so-called vertical alignment type liquid crystal device, wherein a liquid crystal layer is sandwiched between a pair of substrates, and the major axis direction of the liquid crystal molecules in the liquid crystal layer is when the voltage is not applied. It is oriented substantially perpendicular to the substrate. One of the pair of substrates includes an active element such as the element substrate side e.g. TFD, a pixel electrode, and a wiring connecting the active element and the pixel electrode. Here, the wiring is connected to the unit electrode in the length direction substantially perpendicular to the tangent of the polygonal outer edge of the unit electrode or the tangent of the substantially circular circumferential portion, and the wiring is connected to the unit electrode. The portion overlaps the protruding portion, and the wiring does not exist in the unit electrode. In the vertical alignment method, the alignment of liquid crystal molecules is controlled substantially radially from the center of the pixel electrode to the outside, so that the length of the wiring is tangent to the outer edge of the polygon of the unit electrode or a substantially circular circumference. The unit electrode is connected to the unit electrode substantially perpendicular to the tangent of the part, and a part of the wiring overlaps with the protruding part, and the wiring is not present in the unit electrode. By connecting, the adverse effect of the electric field generated in the wiring portion on the alignment of the liquid crystal molecules can be reduced. Therefore, high-quality display without display unevenness is possible.

  In another aspect of the present invention, in the liquid crystal device having a liquid crystal layer sandwiched between a pair of substrates, the major axis direction of the liquid crystal molecules in the liquid crystal layer is aligned substantially perpendicular to the substrate when no voltage is applied. One of the pair of substrates includes an active element, a transparent electrode, and a wiring connecting the active element and the transparent electrode, and the wiring is substantially perpendicular to a tangent line of the transparent electrode. Has been placed.

  The above-described liquid crystal device is preferably configured as a so-called vertical alignment type liquid crystal device, wherein a liquid crystal layer is sandwiched between a pair of substrates, and the major axis direction of the liquid crystal molecules in the liquid crystal layer is when the voltage is not applied. It is oriented substantially perpendicular to the substrate. One of the pair of substrates includes an active element such as TFD on the element substrate side, a transparent electrode that constitutes a part of the pixel electrode, and a wiring that connects the active element and the transparent electrode. Here, the wiring is arranged substantially perpendicular to the tangent of the transparent electrode. In the vertical alignment method, the alignment of the liquid crystal molecules is controlled substantially radially from the center of the transparent electrode to the outside. Therefore, by arranging the wiring substantially perpendicular to the tangent line of the transparent electrode, the electric field generated in the wiring portion is liquid crystal. The adverse effect on the molecular orientation can be reduced. Therefore, high-quality display without display unevenness is possible.

  In one aspect of the above liquid crystal device, a plurality of the transparent electrodes are connected to form a pixel electrode, and the wiring is connected to one of the plurality of transparent electrodes. In this embodiment, a plurality of transparent electrodes each having a polygonal or substantially circular shape are connected to form a pixel electrode corresponding to one pixel. Thereby, since each transparent electrode can be formed small, the orientation of liquid crystal molecules can be accurately controlled for each region of each transparent electrode.

  In another aspect of the liquid crystal device, the wiring includes a shield portion that extends between the active element and the transparent electrode and shields the active element and the transparent electrode. In this aspect, a part of the wiring is formed so as to extend between the active element and the transparent electrode. In general, since the active element portion has a higher potential than the transparent electrode portion, the electric field in the transparent electrode region may be disturbed by the potential of the active element. Therefore, by providing a shield part by extending a part of the wiring, the transparent electrode part can be electrically shielded from the active element, and the disorder of the alignment of the liquid crystal element due to the disturbance of the electric field can be prevented. From the viewpoint of such a shielding effect, the wiring preferably extends along the outer edge of the transparent electrode.

  Another embodiment of the above liquid crystal device includes another substrate on which a stripe-shaped scan electrode is formed and opposed to the substrate, and the scan electrode has a position facing substantially the center of the transparent electrode. An opening or a convex portion is formed on the surface. In this aspect, the orientation of the liquid crystal molecules is controlled radially in a region where the opening or convex portion formed at a position facing substantially the center of the transparent electrode and the polygonal or substantially circular transparent electrode are arranged to face each other. . In this way, a wide viewing angle can be achieved by the vertical alignment method.

  In addition, an electronic device including the above liquid crystal device can be formed.

[Configuration of liquid crystal display device]
First, an electrical configuration of a vertical alignment type liquid crystal display device according to an embodiment of the present invention will be described. FIG. 1 is a block diagram showing an electrical configuration of the display device. As shown in this figure, in the liquid crystal display device 100, a plurality of m scanning lines (common wirings) 214 are formed extending in the row (X) direction, while a plurality of 3n data lines (segment wirings) are formed. ) 314 extends in the column (Y) direction, and a pixel 110 is formed corresponding to each intersection of the scanning line 214 and the data line 314. This pixel 110 corresponds to one of R (red), G (green), and B (blue), and one dot 120 is constituted by three RGB pixels 110 adjacent to each other in the X direction. Has been.

  Here, the pixel 110 includes a series connection of a liquid crystal capacitor 162 and a TFD (Thin Film Diode) 320 which is an example of a two-terminal switching element. Among these, as will be described later, the liquid crystal capacitor 162 has a configuration in which liquid crystal, which is an example of an electro-optical material, is sandwiched between a scanning line 214 that functions as a counter electrode and a pixel electrode. One end of the TFD 320 is connected to the data line 314 and the other end is connected to the pixel electrode, and on / off is controlled according to the potential difference between the scanning line 214 and the data line 314. In this display device, for convenience of explanation, the total number of scanning lines 214 is m, the total number of data lines 314 is 3n, and dots 120 are arranged in m rows and n columns (pixel 110 is m rows). 3n columns) will be described as a matrix type display device, but the application of the present invention is not limited to this.

  Next, the Y drivers 251 and 253 are generally called scanning line driving circuits. Among them, the Y driver 251 is responsible for driving the odd (1, 3, 5,..., M−1) th scanning line 214 counted from the top in FIG. 1, and the Y driver 253 is an even number counted from the top. (2, 4, 6,..., M) is responsible for driving the scanning line 214 of the first. That is, the Y drivers 251 and 253 select the scanning lines 214 in the first row, the second row, the third row,... The scanning line 214 is supplied with the scanning signal of the selection voltage, while the other non-selection scanning lines 214 are supplied with the scanning signal of the non-selection voltage. For convenience of explanation, a scanning signal generally supplied to the scanning line 214 in the j-th row (i is an integer satisfying 1 ≦ j ≦ m) is denoted as Yj.

  In addition, the X driver 350 is generally called a data line driving circuit, and the 3n pixels 110 located on the scanning line 214 selected by any of the Y drivers 251 and 253 correspond to the display contents. Data signals X1B, X1G, X1R, X2B, X2G, X2R,..., XnB, XnG, XnR are supplied via corresponding data lines 314, respectively. The data signal is generally supplied to the data line 314 shared by the B, G, and R pixels 110 in the dot 120 in the i-th column (i is an integer satisfying 1 ≦ i ≦ n). Are denoted as XiB, XiG, and XiR, respectively.

  Next, a mechanical configuration of the liquid crystal display device 100 will be described. FIG. 2 is a perspective view showing an external configuration of the liquid crystal display device 100. In this figure, in order to make the wiring layout in the liquid crystal display device 100 easy to understand, the observation side visually recognized by the observer is shown as the back side in the figure, while the back side that the observer does not normally visually recognize is shown in the figure. It is shown as the front side. FIG. 3 is a partial cross-sectional view showing the configuration when the liquid crystal display device 100 is broken along the X direction in FIG. Therefore, it should be noted that FIG. 2 and FIG. 3 are upside down.

  As shown in these drawings, in the liquid crystal display device 100, a substrate 300 located on the observation side and a substrate 200 located on the back side and slightly smaller than the observation-side substrate 300 also serve as spacers. The sealant 110 in which the conductive particles 114 are dispersed at an appropriate ratio is bonded with a predetermined gap, and a TN (Twisted Nematic) type liquid crystal 160 is sealed in the gap. . Here, the sealing material 110 is formed along the inner periphery of the substrate 200, and a part of the sealing material 110 is opened to enclose the liquid crystal 160. Therefore, after the liquid crystal 160 is sealed, the opening is sealed with the sealing material 112.

  Now, in the substrate 200 on the back side, m scanning lines 214 are formed to extend in the X direction on the surface facing the substrate 300 on the observation side, while on the substrate 300 on the observation side. On the surface facing the substrate 200 on the back side, 3n data lines 314 are formed extending in the Y (column) direction. Of the scanning lines 214 formed on the substrate 200, the odd-numbered scanning lines 214 are extended to the left side in FIG. 2 in the formation region of the sealing material 110, while the even-numbered scanning lines 214 are In the region where the sealing material 110 is formed, it extends to the right side in the figure. In addition, the substrate 300 is provided with wirings 372 in one-to-one correspondence with the scanning lines 214 and is formed so as to face one end of the corresponding scanning lines 214 in the formation region of the sealant 110.

  Here, the conductive particles 114 are dispersed in the sealing material 110 at a ratio such that at least one or more conductive particles 114 are interposed in a portion where one end of the scanning line 214 and one end of the wiring 372 face each other. Therefore, the scanning line 214 formed on the substrate 200 is connected to the wiring 372 formed on the substrate 300 through the conductive particles 114. The wiring 372 has a laminated structure in which the same layer as a second metal film of a TFD 320 described later and the same layer as the pixel electrode 348 are patterned, and the wiring resistance is kept low. Among such wirings 372, the wiring 372 connected to the odd-numbered scanning lines 214 is bent 90 degrees outside the sealing material 100 formation region and then extended to the overhanging region 302 along the Y direction. The The wiring 372 is bonded to the output-side bump of the Y driver 251 in the overhang region 302. Similarly, the wiring 372 connected to the scanning lines 214 in the even-numbered rows is bent 90 degrees outside the formation region of the sealing material 100 and then extended to the overhanging region 302 along the Y direction. It is joined to the output side bump.

  On the other hand, the data lines 314 are extended to the overhanging region 302 with the pitch being narrowed outside the sealing material 100 forming region. The data line 314 is bonded to the output-side bump of the X driver 350 in the overhang region 302. In addition, an FPC (Flexible Circuit Board) substrate 150 is joined to the overhang region 302, and a clock signal, a control signal, and the like are applied from an external circuit (not shown) to the input side bumps of the Y drivers 251 and 253 and the X driver 350. Is configured to supply. A wiring 384 is formed in the overhanging region 302 of the substrate 300, and one end thereof is connected to the input side bump of the Y driver 251, 253 or the X driver 350, while the other end is connected to the wiring of the FPC board 150. Connected.

  2, for the sake of convenience, the number m of scanning lines 214 is set to “8”, and the number 3n of data lines 314 is set to “18”. The overhanging region 302 is provided with inspection terminals 217, 219, and 319, which will be described later.

[Internal configuration]
Next, the internal configuration of the display area in the liquid crystal display device 100 will be described. As shown in FIG. 3, first, a retardation plate 133 and a polarizing plate 131 are attached to the outer surface of the observation-side substrate 300. Note that the retardation plate 133 and the polarizing plate 131 are omitted in FIG. 2 for simplification. Further, data lines 314 made of chromium or the like are formed on the inner surface of the substrate 300 so as to extend in the Y direction (the direction perpendicular to the paper surface in FIG. 3). Further, a pixel electrode 348 made of a transparent conductive material such as ITO (Indium Tin Oxide) is formed in the vicinity of the data line 314. The detailed configuration of the data line 314, the pixel electrode 348, and the like will be described later. Here, a vertical alignment film 308 is formed on the surface of the pixel electrode 348. Note that the vertical alignment film 308 is not provided outside the display region, and thus is not provided near or outside the region where the sealant 110 is formed.

  Subsequently, the substrate 200 on the back side will be described. A phase difference plate 123 and a polarizing plate 121 are attached to the outer surface of the substrate 200. Note that the retardation plate 123 and the polarizing plate 121 are also omitted in FIG. On the other hand, a scattering resin layer 203 having undulations is formed on the inner surface of the substrate 200. The scattering resin layer 203 is formed by, for example, heat-treating a photoresist patterned in a spot shape on the surface of the substrate 200 to soften an end portion of the photoresist.

  Next, a reflective film 204 made of a reflective metal such as aluminum or silver is formed on the undulating surface of the scattering resin layer 203. Therefore, the surface of the reflective film 204 is also undulated reflecting the undulation of the scattering resin layer 203, so that the light incident from the observation side is appropriately scattered when reflected by the reflective film 204. In order to make the liquid crystal display device 100 function not only as a reflection type but also as a transmission type, the reflection film 204 is provided with an opening 209 for transmitting light. In addition, without forming such an opening 209, for example, by forming a light-reflective metal such as aluminum with a relatively thin film thickness (20 nm to 50 nm), it is possible to reduce incident light from the back side. It is good also as a structure which permeate | transmits a part.

  Further, on the surface of the reflective film 204, a red color filter 205R, a green color filter 205G, and a blue color filter 205B are respectively provided in correspondence with the opposing regions of the pixel electrode 348 and the scanning line 214. It is provided in an array. Note that the arrangement of the color filters 205R, 205G, and 205B is a stripe arrangement suitable for data display in the present embodiment.

  Next, a flattening film 207 made of an insulating material is provided on the surface of each color filter 205R, 205G, 205B to flatten the unevenness of the step of the color filter and the reflective film 204. Then, on the surface flattened by the flattening film 207, the scanning line 214 made of a transparent conductive material such as ITO is formed in the X direction (the horizontal direction in the drawing in FIG. 3), and the pixel electrode 348 formed on the observation-side substrate 300. Are formed to face each other. A vertical alignment film 208 made of polyimide or the like is formed on the surface of the scanning line 214. The vertical alignment film 208 is rubbed in a predetermined direction before being bonded to the observation-side substrate 300. Further, the color filters 205R, 205G, and 205B, the planarizing film 207, and the vertical alignment film 208 for each color are not provided outside the display area, and thus are not provided near the area of the sealant 110 and outside the area.

[Pixel configuration]
Next, the pixel configuration in the liquid crystal display device 100 will be described. 4A is a plan view showing a layout of one dot (for three pixels) in the liquid crystal display device 100, and FIG. 4B is a cross-sectional view taken along line AA ′ in FIG. It is sectional drawing along a line. 4A shows a configuration when the observation side is viewed from the back side, so that the near side is the back side in FIG. 4A and the top side is the back side in FIG. 4B.

  The liquid crystal display device 100 of the present invention is of a vertical alignment type, and the pixel electrode 348 is referred to as a plurality of (three in this example) polygonal transparent electrode portions (hereinafter referred to as “unit electrode portion 348u”) as shown in the figure. ). In the vertical alignment method, liquid crystal molecules are aligned substantially radially on the unit electrode portion 348u, so that each unit electrode portion 348u has a polygonal shape or a circular shape (described later) such that the outer edge or outer periphery of the electrode is substantially equidistant from the center point. Certain shapes are preferred. In the embodiment of FIG. 4A, three unit electrode portions 348u are arranged in series. The reason why the plurality of unit electrode portions 348 are formed in one pixel is that the orientation state of the liquid crystal molecules is easier to control when the individual unit electrode portions 348u are somewhat small. That is, the alignment of the liquid crystal molecules can be accurately controlled compared to the case where one pixel is constituted by one large unit electrode portion.

  The pixel electrodes 348 are arranged in a matrix on the substrate 300, and among these, the pixel electrodes 348 belonging to the same column are commonly connected to one data line 314 via the TFD 320. In addition, as described above, the pixel electrodes 348 in the same row face one scanning line 214 (shown by a broken line). A first metal film 312 and an insulating film 313 are stacked below the data line 314 from the substrate 300 side.

  The TFD 320 includes a first TFD 320a and a second TFD 320b. The first TFD 320a and the second TFD 320b include an island-shaped first metal film 322 made of tantalum tungsten, an insulating film 323 formed by anodizing the surface of the first metal film 322, and the surface. And second metal films 316 and 336 spaced apart from each other. Of these, the second metal films 316 and 336 are formed by patterning the same conductive film such as chromium, and the former second metal film 316 is branched from the data line 314 in a T shape, The latter second metal film 336 is used to connect to a pixel electrode 348 such as ITO.

  Here, among the TFDs 320, the first TFD 320a becomes the second metal film 316 / the insulating film 323 / the first metal film 322 in order from the data line 314 side, and the metal / insulator / metal. Due to the structure, the current-voltage characteristic is nonlinear in both positive and negative directions. On the other hand, the second TFD 320b becomes a first metal film 322 / insulating film 323 / second metal film 336 in order when viewed from the data line 314 side, and has a structure opposite to the first TFD 320a. . For this reason, the current-voltage characteristics of the second TFD 320b are obtained by making the current-voltage characteristics of the first TFD 320a point-symmetric with respect to the origin. As a result, the TFD 320 has a shape in which two TFDs are connected in series in opposite directions. Therefore, the current-voltage nonlinear characteristic is symmetric in both positive and negative directions compared to the case of using one element. .

  Next, a cross-sectional shape of one pixel 110 will be described with reference to FIG. FIG. 6 also shows the configuration on the counter substrate 200 side. In FIG. 6, the upper side is the back side and the lower side is the observation side (that is, the vertical relationship of the substrate is the same as that in FIG. 4 and is opposite to that in FIG. 3).

  FIG. 6A is a cross-sectional view taken along B-B ′ in FIG. As shown in the figure, a data line 314 is formed on the first metal film 312 and the insulating film 313 and a pixel electrode 348 is formed on the substrate 300 on the active element side. On the other hand, on the opposite substrate 200, a resin scattering film 203, a reflective film 204, and a color filter 205 are formed on the substrate 200 (see FIG. 3, not shown in FIG. 6A), and flat on the resin scattering film 203. A conversion film 207 is formed, and a scanning line 214 made of a transparent electrode is formed thereon. Here, an opening 214a is formed in the scanning line 214 at a position corresponding to the approximate center of each unit electrode portion 348u of the pixel electrode 348 (see also FIG. 5A). When a voltage is applied between the substrates, the electric field in the region of the pixel electrode portion 348u is controlled by the interaction between the opening 214a and the unit electrode portion 348u, and a region in which liquid crystal molecules are radially aligned is formed.

  FIG. 6B shows another example of the shape of the scanning line 214 by the vertical alignment method. In the example of FIG. 6A, the opening 214a is provided at a position corresponding to the center of the unit electrode portion 348u with respect to the scanning line 214, but in the example of FIG. 6B, a convex portion is provided instead of the opening 214a. 214b is provided. Also by this, the electric field in the region of the pixel electrode 348 can be controlled, and the alignment state of the liquid crystal molecules can be controlled radially.

  Next, a configuration of a connection portion between the TFD 320 which is an active element and the pixel electrode 348 will be described. FIG. 5A shows the shape of a connection portion between one pixel electrode 348 and the second metal film 336. As illustrated, the second metal film 336 includes a portion 336e constituting the second TFD 320b and a wiring portion 336a connecting the second TFD 320b to the unit electrode portion 348u. Here, the wiring portion 336a is formed so that the length direction L2 thereof has an angle α with respect to the direction L1 along the side of the unit electrode portion 348u, as illustrated.

As shown in the figure, the opening 214a formed in the scanning line 214 on the counter substrate side is opposed to the substantial center of the unit electrode portion 348u, and the orientation of the liquid crystal molecules is controlled to be substantially radial around the opening 214a when a voltage is applied. . Therefore, it is desirable that the electric field around the unit electrode portion 348u be as uniform as possible so as not to adversely affect the electric field formed by the opening 214a and the unit electrode portion 348a. However, it is necessary to connect the wiring portion 336a from the TFD 320b to the pixel electrode 348. Here, for example, as a wiring portion 336a shown in wiring 336a and FIG. 7 (b) shown in FIG. 7 (a), when the wiring portion is arranged obliquely relative to the outer side of the unit electrode portion 348a, the portion ( Since the electric field in the regions X1 and X2) indicated by the broken line has a great influence on the electric field formed by the opening 214a and the unit electrode portion 348u, the electric field is disturbed in the wiring portion 336a, and the liquid crystal molecules are radiated well. It becomes difficult to orient.

  Therefore, in the present embodiment, the wiring portion 336a is disposed so as to have an angle close to perpendicular to the outer side of the unit electrode portion 348u. That is, the angle α shown in FIG. Thereby, the adverse effect of the electric field generated by the wiring part 336a on the electric field formed by the opening 214a and the unit electrode part 348u can be minimized. From the viewpoint of suppressing the influence of the electric field generated by the wiring portion 336a, it is optimal that the direction of the wiring portion 336a is perpendicular to the side of the unit electrode portion 348u (that is, α = about 90 degrees). However, even if it is not completely vertical, the same effect can be obtained by making the direction close to vertical. In other words, it is effective if it is about ± 20 degrees (that is, α = 70 to 110 degrees) with respect to the vertical, and further effective if it is about ± 10 degrees (that is, α = 80 to 100 degrees) with respect to the vertical. , Vertical (ie, α = 90 degrees) is optimal.

  As described above, in this embodiment, the wiring portion 336a that connects the TFD 320b, which is an active element, and the pixel electrode 348 is disposed substantially perpendicular to the outer side of the pixel electrode 348. The influence of the electric field can be suppressed.

  FIG. 9A shows an enlarged view of a connection portion between the wiring portion 336a and the unit electrode portion 348u and a cross-sectional view thereof. In the present embodiment, as illustrated, the wiring portion 336a is provided below the unit electrode portion 348u only outside the unit electrode portion 348u. In other words, the wiring part 336a does not exist in the region of the unit electrode part 348u, and the wiring part 336a is in contact with the unit electrode part 348u outside the unit electrode part 348u. A part 348x of the unit electrode part 348u is formed to protrude outward on the wiring part 336a.

  For comparison, FIG. 9B shows an example in which the wiring part 336a is formed so as to enter the unit electrode part 348u. In the structure of FIG. 9B, an alignment failure occurs in the overlapping portion 348y between the wiring portion 336a and the unit electrode portion 348u.

  On the other hand, in this embodiment, as shown in FIG. 9A, the overlapping portion between the wiring portion 336a and the unit electrode portion 348u exists outside the unit electrode portion 348u. As a result, it is possible to suppress the occurrence of poor alignment of the pixel electrode due to the step in the overlapping portion between the wiring portion 336a and the unit electrode portion 348u.

Next, FIG. 5B shows another example of the pixel electrode. In the pixel electrode 348 shown in FIG. 5B, each unit electrode portion 348u has a substantially circular planar shape instead of a polygon. In this case, the wiring portion 336a is substantially perpendicular (α = 90 degrees) to the tangent L3 of the circular unit electrode portion 348u as shown in the figure. As in the case of FIG. 5 (a), even when not vertical, it is effective if it is within a range of about ± 20 degrees with respect to the vertical, and more effective if it is within a range of about ± 10 degrees. .

  FIG. 8A shows another example of the wiring connection portion. In FIG. 8A, each unit electrode portion 348u constituting the pixel electrode 348 has a polygonal planar shape as in FIG. Further, the wiring 336a is arranged substantially perpendicular (α = about 90 degrees) with respect to the outer side of the unit electrode portion 348u. Therefore, similarly to the example of FIG. 5A, it is possible to prevent the electric field from being disturbed at the connection portion with the wiring.

  In addition, in this example, the wiring portion 336a includes an extension portion 336b. The extension portion 336b extends between the unit electrode portion 348u and the TFD 320b substantially parallel to one side so as to cover the outer edge of the unit electrode portion 348u as illustrated. The extension portion 336b has an effect of electrically shielding the unit electrode portion 348u from the TFD 320b. In general, since the TFD 320b portion has a higher potential than the wiring portion 336a, the extension portion 336b can shield the unit electrode portion 348u from the TFD 320b and can be generated in the region of the pixel electrode 348 due to the TFD 320b. Disturbance of the electric field can be prevented. Thereby, the alignment control of the liquid crystal molecules in the region of the pixel electrode 348 can be performed more accurately.

  FIG. 8B shows an example in which similar wiring is applied to the circular pixel electrode 348 shown in FIG. Also in this example, the wiring 336a is disposed substantially perpendicular (α = about 90 degrees) with respect to the tangent to the unit electrode portion 348u. Therefore, similarly to the example of FIG. 5A, it is possible to prevent the electric field from being disturbed at the connection portion with the wiring. Furthermore, in this example, the extended portion 336b extends between the unit electrode portion 348u and the TFD 320b in the tangential direction so as to cover the outer periphery of the unit electrode portion 348u constituting the pixel electrode 348. Therefore, an effect of electrically shielding the unit electrode portion 348u from the TFD 320b can be obtained.

[Modification]
In the above embodiment, an example in which a thin film transistor (TFT) element is used as an active element has been described. However, application of the present invention is not limited to this. FIG. 10 shows a cross-sectional view of an amorphous TFT as another example of the active element. In FIG. 10, a TFT 450 is provided with a gate insulating film 403 on a gate electrode 402 branched from a gate line (not shown) so as to cover it. An a-Si layer 405 is provided on the gate insulating film 403 so as to overlap the gate electrode 402. On the a-Si layer 405, n + -a-Si layers 406a and 406b divided into two are provided. Further, a source electrode 408 branched from the source lines (not shown) on the n + -a-Si layer 406a is provided, the drain electrode 409 is provided on the n + -a-Si layer 406b. A pixel electrode 410 is provided on the drain electrode 409 so as to partially overlap. A protective film 411 is provided so as to cover these layers.

  The present invention can also be applied to a connection portion between the drain electrode 409 of the amorphous TFT as described above and the pixel electrode 410 as an active element. That is, the present invention can be applied using the drain electrode 409 as the wiring portion 336 in the above embodiment.

[Electronics]
Next, an embodiment in which the liquid crystal display device 100 according to the present invention is used as a display device of an electronic apparatus will be described.

  FIG. 11 is a schematic configuration diagram showing the overall configuration of the present embodiment. The electronic apparatus shown here includes the liquid crystal display device 100 and a control unit 610 that controls the liquid crystal display device 100. Here, the liquid crystal display device 100 is conceptually divided into a panel structure 603 and a drive circuit 602 composed of a semiconductor IC or the like. The control unit 610 includes a display information output source 611, a display information processing circuit 612, a power supply circuit 613, and a timing generator 614.

  The display information output source 611 includes a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), a storage unit such as a magnetic recording disk or an optical recording disk, and a tuning circuit that tunes and outputs a digital image signal. The display information is supplied to the display information processing circuit 612 based on various clock signals generated by the timing generator 614 in the form of an image signal of a predetermined format.

  The display information processing circuit 612 includes various known circuits such as a serial-parallel conversion circuit, an amplification / inversion circuit, a rotation circuit, a gamma correction circuit, and a clamp circuit, and executes processing of input display information to obtain image information. Are supplied to the drive circuit 602 together with the clock signal CLK. The driving circuit 602 includes a scanning line driving circuit, a data line driving circuit, and an inspection circuit. The power supply circuit 613 supplies a predetermined voltage to each of the above-described components.

  Next, specific examples of electronic devices to which the liquid crystal display device 100 according to the present invention can be applied will be described with reference to FIG.

  First, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 12A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display panel according to the present invention is applied.

  Next, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 12B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the cellular phone 720 includes a plurality of operation buttons 721, a reception port 722, a transmission port 723, and a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied.

  Note that, as an electronic apparatus to which the liquid crystal display device 100 according to the present invention can be applied, in addition to the personal computer shown in FIG. 12A and the mobile phone shown in FIG. Type / monitor direct-view type video tape recorder, car navigation device, pager, electronic notebook, calculator, word processor, workstation, videophone, POS terminal, digital still camera, etc.

It is a block diagram which shows the electrical constitution of the liquid crystal display device to which this invention is applied. It is a perspective view which shows the structure of a liquid crystal display device. It is a fragmentary sectional view in the X direction of a liquid crystal display device. It is a figure which shows the structure of a pixel area. It is a figure which shows the example of arrangement | positioning of a pixel electrode and wiring. It is an example of sectional drawing of the pixel part of a liquid crystal display device. It is a figure which shows the other example of arrangement | positioning of a pixel electrode and wiring. It is a figure which shows the other example of arrangement | positioning of a pixel electrode and wiring. It is an enlarged view of the connection part of a pixel electrode and wiring. The other example of an active element is shown. It is a block diagram which shows the circuit structural example of the electronic device to which a liquid crystal display device is applied. Examples of electronic devices are shown.

Explanation of symbols

100 liquid crystal display device, 110 pixels, 160 liquid crystal, 200, 300
Substrate, 214 scan lines, 314 data lines, 320 TFD,
336 Second metal film, 336a wiring part, 336b extension part

Claims (5)

  1. A liquid crystal device having a liquid crystal layer sandwiched between a pair of substrates,
    The major axis direction of the liquid crystal molecules in the liquid crystal layer is aligned substantially perpendicular to the substrate when no voltage is applied,
    A plurality of pixels are formed on one of the pair of substrates,
    Each of the pixels includes an active element, a pixel electrode, and a wiring connecting the active element and the pixel electrode,
    The pixel electrode has a shape in which the liquid crystal molecules are aligned substantially radially from the center of the pixel electrode when a voltage is applied to the liquid crystal molecules.
    The pixel electrode includes a plurality of polygonal or substantially circular unit electrodes arranged in series, and the wiring is electrically connected to a protruding portion protruding outward from one of the plurality of unit electrodes. Has been
    The wiring is connected to the unit electrode in a length direction substantially perpendicular to a tangent of a polygonal outer edge of the unit electrode or a tangent of a substantially circular circumferential portion, and a part of the wiring is The liquid crystal device according to claim 1, wherein the liquid crystal device overlaps with the protruding portion, and the wiring does not exist in the unit electrode .
  2. The liquid crystal device according to claim 1, wherein the wiring includes a shield portion that extends between the active element and the pixel electrode and shields the active element and the pixel electrode.
  3. The liquid crystal device according to claim 2, wherein the wiring extends along an outer edge of the pixel electrode.
  4. A stripe-shaped scanning electrode is formed and another substrate disposed opposite to the substrate is provided,
    4. The liquid crystal device according to claim 1 , wherein an opening or a convex portion is formed in the scan electrode at a position facing substantially the center of the pixel electrode. 5.
  5. An electronic apparatus comprising the liquid crystal device according to claim 1 .
JP2004022255A 2004-01-29 2004-01-29 Liquid crystal device and electronic device Expired - Fee Related JP4686980B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004022255A JP4686980B2 (en) 2004-01-29 2004-01-29 Liquid crystal device and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004022255A JP4686980B2 (en) 2004-01-29 2004-01-29 Liquid crystal device and electronic device

Publications (2)

Publication Number Publication Date
JP2005215352A JP2005215352A (en) 2005-08-11
JP4686980B2 true JP4686980B2 (en) 2011-05-25

Family

ID=34905651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004022255A Expired - Fee Related JP4686980B2 (en) 2004-01-29 2004-01-29 Liquid crystal device and electronic device

Country Status (1)

Country Link
JP (1) JP4686980B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950104B (en) 2005-09-30 2012-10-10 夏普株式会社 Liquid crystal display and method for manufacturing same
WO2009004849A1 (en) 2007-07-02 2009-01-08 Sharp Kabushiki Kaisha Liquid crystal display device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04285917A (en) * 1991-03-15 1992-10-12 Matsushita Electric Ind Co Ltd Liquid crystal display device
JPH08254715A (en) * 1994-05-13 1996-10-01 Thomson Multimedia Sa Liquid crystal display device
JP2000075275A (en) * 1998-08-28 2000-03-14 Nec Corp Liquid crystal display device
JP2001264784A (en) * 1999-06-18 2001-09-26 Nec Corp Method of manufacturing liquid crystal display device and method of driving the same
JP2002072197A (en) * 2000-08-29 2002-03-12 Nec Corp Reflective liquid crystal display device, method of manufacturing the same, and method of driving the same
JP2002287158A (en) * 2000-12-15 2002-10-03 Nec Corp Liquid crystal display device and method of manufacturing the same as well as driving method for the same
JP2003043525A (en) * 2000-08-11 2003-02-13 Sharp Corp Liquid crystal display device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04285917A (en) * 1991-03-15 1992-10-12 Matsushita Electric Ind Co Ltd Liquid crystal display device
JPH08254715A (en) * 1994-05-13 1996-10-01 Thomson Multimedia Sa Liquid crystal display device
JP2000075275A (en) * 1998-08-28 2000-03-14 Nec Corp Liquid crystal display device
JP2001264784A (en) * 1999-06-18 2001-09-26 Nec Corp Method of manufacturing liquid crystal display device and method of driving the same
JP2003043525A (en) * 2000-08-11 2003-02-13 Sharp Corp Liquid crystal display device
JP2002072197A (en) * 2000-08-29 2002-03-12 Nec Corp Reflective liquid crystal display device, method of manufacturing the same, and method of driving the same
JP2002287158A (en) * 2000-12-15 2002-10-03 Nec Corp Liquid crystal display device and method of manufacturing the same as well as driving method for the same

Also Published As

Publication number Publication date
JP2005215352A (en) 2005-08-11

Similar Documents

Publication Publication Date Title
US6545736B2 (en) Liquid crystal display device having particular pixel region
US8717267B2 (en) Liquid crystal display
CN2630888Y (en) Transflective liquid crystal device and electronic appliance using the same
KR100841153B1 (en) Liquid crystal apparatus and electronic device
JP4068951B2 (en) Liquid crystal display
JP3675404B2 (en) Transflective liquid crystal device and electronic equipment using the same
CN100356239C (en) Liquid crystal display apparatus
KR20000069149A (en) Electro-optical device and electronic apparatus
US6356331B1 (en) Liquid crystal display device
US6147722A (en) Liquid crystal display device with contact hole over shading line but offset from center
US20030218664A1 (en) Semi-transmissive liquid crystal display device
CN1221845C (en) Active-matrix addressing LCD device using laterial electric field
JP3617458B2 (en) Substrate for display device, liquid crystal device and electronic device
JP3675427B2 (en) Transflective liquid crystal device and electronic equipment using the same
JP5246782B2 (en) Liquid crystal device and electronic device
US6912024B2 (en) Array substrate of liquid crystal display device having thin film transistor on color filter structure and method of fabricating the same
JP3772842B2 (en) Liquid crystal device, driving method thereof, and electronic apparatus
US7480022B2 (en) Liquid crystal display device, method of manufacturing liquid crystal display device, and electronic apparatus
KR100902453B1 (en) Liquid crystal device and electronic apparatus
JP3900123B2 (en) Liquid crystal display device and electronic device
US20060050210A1 (en) Liquid crystal display device and electronic apparatus
US6683671B1 (en) Liquid crystal display device with spacers on color filters outside display area and method of manufacturing the same
US7102714B2 (en) Transflective LCD device with opening formed in electrode positioned corresponding to inclined plane of thickness-adjusting layer
US7321409B2 (en) Transflective liquid crystal device and electronic apparatus using the same
JP4169035B2 (en) Liquid crystal device and electronic device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060727

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20070403

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090630

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090811

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091009

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100406

RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20100422

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20100423

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20100604

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100604

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110118

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110131

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140225

Year of fee payment: 3

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

LAPS Cancellation because of no payment of annual fees