JP2000194017A - Liquid crystal display device and electronic instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain high precision and high quality of display image by making vertical and horizontal irregular stripe inconspicuous. SOLUTION: Pixel electrodes 234 corresponding to respective colors of RGB are shifted by half pitches in a line direction (X direction in the figure) and are arranged in RGB data array. A data line 212x is stretched in a column direction in a folding pattern with four pixels extending from A line to D line as a cycle, is shared by use and surrounds periphery of the pixel electrode 234 which is shared by use at every pixel electrode and is connected with the pixel electrode 234 via a TFD element 220.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, a liquid crystal display device, and an electronic apparatus using the liquid crystal display device, in which stripes caused by vertical and horizontal crosstalk are made inconspicuous.

[0002]

2. Description of the Related Art Generally, in a color liquid crystal display device, R (red), G (green) and B (blue) are used.
It is composed of an element substrate in which a non-linear (switching) element is provided for each of the pixel electrodes corresponding to the primary colors, a counter substrate in which three primary color filters are formed, and a liquid crystal filled between these two substrates. Is done. In such a configuration, when a scanning signal is applied to a switching element via a scanning line, the switching element is turned on.
When an image signal is applied to the pixel electrode via the data line in this conductive state, predetermined charges are accumulated in the liquid crystal layer between the pixel electrode and the counter electrode. After the charge accumulation, even if the switching element is turned off, if the resistance of the liquid crystal layer is sufficiently high, the accumulation of charge in the liquid crystal layer is maintained. As described above, when the amount of electric charge to be accumulated by driving each switching element is controlled, the alignment state of the liquid crystal changes for each pixel, so that predetermined information can be displayed.

At this time, since it is sufficient to accumulate electric charges in each liquid crystal layer during a part of the period, the scanning lines and the data lines are shared by a plurality of pixels by selecting each scanning line in a time-division manner. Time-division multiplex drive is possible.

The pixel arrangement of a color filter in such a color liquid crystal display device is generally the same as that shown in FIG.
(A) to (d) are known. Among them, the pixel array shown in FIG. 1A is called an RGB stripe array or a trio array, and is an array suitable for a computer display that displays characters, straight lines, and the like. However, the resolution is not substantially high as compared with the other arrangements shown in FIGS.

Next, the pixel arrangement shown in FIG.
It is called an RGGB mosaic arrangement and generally has a high resolution because it has a larger number of G pixels with high visibility, but is not always evaluated high in a subjective evaluation experiment. Further, in the RGGB mosaic arrangement, since the number of pixels of B and R is small, if the viewing distance is short, there is a drawback that a rough image is noticeable.

The pixel arrangement shown in FIG.
This is called an RGB mosaic arrangement. In this arrangement, there is a difference in display quality between the diagonal line rising to the right and the diagonal line rising to the left, so that diagonal noise appears in the entire image, especially when the number of pixels on the screen is small. For this reason, it is not generally adopted.

The pixel array shown in FIG. 1D is called an RGB delta array, and has a horizontal resolution 1.5 times that of the mosaic array. The RGB delta arrangement is said to have difficulty in the outline of an image, but is generally evaluated high in a subjective evaluation experiment, and thus is suitable for achieving high definition and high image quality of a color liquid crystal display device. It is an array. Therefore, from now on, this R
The problem in adopting the GB delta array will be discussed.

First, the pixel arrangement of the color filter is changed to RGB.
In the case of the delta arrangement, the wiring pattern of a conduction line (one of a data line or a scanning line, hereinafter simply referred to as a line) connected to a pixel electrode serving as a basis of these pixels is first described with reference to FIG. As shown in (b), a method in which two colors among three colors of RGB are shared for one line is conceivable. That is, the line (') shares RG, the line (') shares GB, and the line (') shares BR. However, according to this method, when a solid pattern of C (cyan), Y (yellow), and M (magenta), which are complementary colors, is displayed in each of the RGB colors, linear unevenness due to vertical crosstalk occurs. There's a problem.

A description will be given of a case where cyan is displayed as an example of the mechanism for generating the uneven streaks. Here,
A description will be given of a normally white mode liquid crystal display device that displays white (off) in a state where no voltage is applied. When displaying cyan, it is necessary to write black (on) for the R pixel and white for the G and B pixels, so it is necessary to write only for the R pixel. Here, since the G pixels in the even rows are connected to the line ('), the potential of the G pixels is drawn to the potential at the time of writing to the R pixels, while the G pixels in the odd rows are connected to the line ('). ('), So that G
Has almost no relation to the potential at the time of writing to the R pixel. Similarly, since the B pixel in the odd-numbered row is connected to the line ('),
Is pulled into the potential at the time of writing to the R pixel, while the B pixel in the even-numbered row is connected to the line ('). It is almost independent of the potential at the time.

As a result, the effective voltage value applied to the G pixel in the even-numbered row is different from the effective voltage value applied to the G pixel in the odd-numbered row. Since the effective voltage value and the effective voltage value applied to the B pixels in the even rows are different from each other, a difference in density occurs every other row, resulting in occurrence of uneven streaks. The same applies to the case where yellow and magenta are displayed. A difference in density occurs between the odd-numbered rows and the even-numbered rows, causing uneven streaks.

From a different point of view, this difference in the density also results in uneven streaks in the column direction. That is, the B and G pixels that are affected by writing to the R pixel are shifted by half a pitch and continue in the column direction, while the B and G pixels that are not affected by writing to the R pixel are similarly shifted by half. It shifts by the pitch and continues in the column direction. Therefore, a difference occurs in the density between the column-direction cyan composed of the former pixels and the column-direction cyan composed of the latter pixels.
Streaks also occur in the column direction.

In order to prevent the potential at the time of writing to a pixel of a certain color from affecting the potential of a pixel of another color, as shown in FIG. 13, only one color is shared for one line. A method is conceivable. In other words, the line shares only G, the line only B, and the line R only.

However, in this method, when a solid pattern of cyan, yellow, and magenta, which are complementary colors, is displayed for each of the RGB colors, uneven streaks due to horizontal crosstalk occur.

The mechanism of the occurrence of uneven streaks caused by the horizontal crosstalk will be described. First, paying attention to the wiring pattern, odd-numbered G pixels are surrounded in a U-shape by a line for writing B pixels, while even-numbered G pixels are surrounded by a line for writing R pixels. Is also enclosed in a U-shape.
That is, in the pixel of G, there are two types, one that is capacitively coupled to the line and one that is capacitively coupled to the line.
There are types. Similarly, there are two types of B pixels, one that capacitively couples to a line and one that capacitively couples to a line.

Here, as in the case of the vertical crosstalk, for example, when cyan is displayed in the normally white mode, it is necessary that the R pixel be black and the G and B pixels be white. Therefore, it is necessary to write only for the R pixel. Therefore, when a write voltage is applied to the line in order to write to the R pixel, the G pixel in the even row and the B pixel in the odd row are applied.
Pixels are capacitively coupled by the line, and thus the density varies. On the other hand, the odd-numbered G pixels and the even-numbered B pixels have almost no relation to the line potential. Does not fluctuate. As a result, there is a difference between the density of the pixel of G in the even-numbered row and the pixel of B in the odd-numbered row, and the density of G in the odd-numbered row and the density of B in the even-numbered row.
Unevenness will occur. The same applies to the case of displaying yellow and magenta.

A line for driving a pixel electrode of a certain color exists only on one of the left and right (in the figure) of the pixel electrode, and a line for driving a pixel of another color exists on the other side. In general, the horizontal crosstalk is not limited to the delta arrangement, but also occurs in other stripe arrangements or mosaic arrangements. Nevertheless, the horizontal crosstalk is only a problem in the delta arrangement because, in other stripe arrangements and mosaic arrangements, there is no distinction between odd-numbered rows and even-numbered rows. There is no other point.

That is, from the viewpoint of line routing, it is considered that the horizontal crosstalk due to the parasitic capacitance of the adjacent line exists without depending on the pixel arrangement, but the influence of the parasitic capacitance affects all pixels. If it is uniform, it cannot be a display problem.

Therefore, the point of eliminating the uneven streaks caused by the horizontal crosstalk is to draw the lines in such a relationship that the colors of the pixels driven by the lines capacitively coupled to the pixels of a certain color do not periodically change. It is thought that it is at the turning point.

As shown in FIG. 12 (a) or (b), the method of sharing two of the three colors of RGB for one line causes vertical crosstalk, so that the display is not performed. It is not suitable for achieving higher definition and higher image quality of the image. In addition, as shown in FIG. 13, the method of sharing one color of RGB for one line causes horizontal crosstalk, which is not suitable for achieving high definition and high image quality. .

Therefore, a wiring pattern that shares three colors for one line can be considered. Here, the period is generally considered to be preferably a multiple of 3 in consideration of the fact that color display is performed in three colors of RGB. Crab will be misaligned. For this reason, a wiring pattern having a cycle of “6” rows, which is a multiple of 3 and an even minimum value, has been proposed as shown in FIGS. 14A to 14C. That is, the lines ~ ('~', "~") are wiring patterns that share RGB respectively,
Each line has a cycle of six rows. However,
It is considered that the horizontal crosstalk occurs in the wiring patterns shown in FIGS. 7A and 7B because the colors of the pixels driven by the lines capacitively coupled to the pixels of a certain color are periodically switched. Can be Therefore, in order to achieve higher definition and higher image quality of the display image, the most appropriate wiring pattern is always capacitively coupled only to the line where each pixel is arranged on the right side, as shown in FIG. It is considered that the following pattern is desirable.

[0021]

However, FIG.
In the wiring pattern shown in (c), if a line shared by three colors, that is, a line shared in the column direction from a macro perspective is wired as a data line, and a line shared in the row direction is wired as a scanning line, Although slight, streaks were observed.

Therefore, as in the case of the vertical / horizontal crosstalk, a case where cyan is displayed in the normally white mode will be described as an example. Also in this case, since it is necessary to make R black and G and B white, it is necessary to write only R.

First, a driving method in this wiring pattern will be described. In general, in a liquid crystal display device, AC driving is a principle in order to prevent deterioration of liquid crystal. Inverting the polarity of an adjacent row is also performed. Thus, for example,
As shown in FIG. 2B, a scanning signal of a positive polarity is applied to each scanning line of rows A, C and E, and a scanning signal of a negative polarity is applied to each scanning line of rows B, D and F. Supplied sequentially. next,
Consider the polarity of the data signal to be supplied when such a scanning signal is supplied. For example, when a positive scan signal is supplied to the scan line of row A, the potential difference between the scan signal and the scan signal needs to be large in R where writing needs to be performed. Is supplied to the data line "connected to R", while the potential difference between the scanning signal and the G and B signals that need not be written needs to be small. , A, are supplied to lines "," as data lines connected to G and B, respectively.

Next, when the scanning signal of the negative polarity is supplied to the scanning line of the B-th row, the data signal of the positive polarity is supplied to the data line " Data signal is a line “,” as a data line
Supplied to

Similarly, when a positive scanning signal is supplied to the scanning line of the C-th row or the E-th row, a negative data signal is supplied to the data line " The data signal is the line "," as the data line
Supplied to When a negative scanning signal is supplied to the D scanning line, a positive data signal is supplied to the data line, while a negative data signal is supplied to the data line. ",".
Further, when a negative scanning signal is supplied to the F-th scanning line, a positive data signal is supplied to the line as the data line, while the negative data signal is supplied to the line as the data line. ",".

Therefore, in the case of displaying cyan, a positive scan signal is applied to each of the scan lines A, C, and E.
When the scanning signals of the negative polarity are sequentially supplied to the respective scanning lines of the B, D, and F rows, the polarities of the data signals supplied to the respective pixels of RGB are as shown in FIG.
It is shown in the pixel.

Incidentally, in a liquid crystal display device, generally, adjacent pixel electrodes are capacitively coupled to each other. In particular, in the RGB delta arrangement, since the pixel electrodes are shifted by half a pitch in the row direction, the degree of capacitive coupling between adjacent pixel electrodes in the line connection direction increases.
For example, R in row B connected to line "" has a higher degree of capacitive coupling with G in row C connected to the same line ". Therefore, the potential written to a certain pixel electrode is more susceptible to the influence as the potential of the pixel electrode capacitively coupled to the pixel electrode changes.

Here, if a certain row, for example, row A is selected and a data signal is supplied to a certain data line, and then the next row B is selected, and the polarity of the data signal is the same, , The amount of potential transition for the pixels in row B connected to the data line is A
Since it is small as viewed from the pixels in the row, the density fluctuation of the pixels in the row A is relatively small. On the other hand, in the same case, if the polarity of the data signal is inverted, the amount of potential transition for the pixels in row B connected to the data line is large as compared to the pixels in row A connected to the data line. Therefore, the density fluctuation of the pixels in the row A becomes relatively large.

That is, for a certain pixel, if the polarity of the data signal supplied for the pixel in the next row is the same after writing the data signal supplied for the own pixel, the density fluctuation will occur. On the other hand, if the polarity of the data signal is inverted, the density fluctuation is increased.

When this density fluctuation is applied to each pixel shown in FIG. 2B, a pixel having a small density fluctuation is expressed by /
Pixels with large density fluctuations indicated by hatching of /
Will be indicated by hatching. Where A, B,
Row C is composed of a G pixel having a large density variation and a B pixel having a small density variation, and therefore has the same density of cyan. On the other hand, rows D, E, and F are composed of a G pixel having a small density variation and a B pixel having a large density variation, and therefore have the same density of cyan, but the G and B pixel densities are A to C. Different from a row. For this reason, since the cyan density displayed on the A to C rows and the cyan density displayed on the DF rows are different from each other, it can be seen that uneven streaks occur. The same applies to the case where yellow and magenta are displayed. Also, in the next frame, the polarity of the scanning signal supplied to the scanning line of each row is inverted, but since the regularity of the pixels with small density fluctuations and the pixels with large density fluctuations do not change, similar linear streaks occur. Will happen.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to reduce the streak in the row and column directions as much as possible to improve the definition of a display image.
A liquid crystal display device with a wiring pattern for high image quality,
Another object of the present invention is to provide an electronic device using the liquid crystal display device.

[0032]

In order to achieve the above object, the present invention provides a liquid crystal display device in which pixel electrodes corresponding to pixels displaying different colors are arranged to be shifted by approximately a half pitch for each row. Wherein the conductive line shared in the column direction in the pixel electrode extends across the pixel electrode corresponding to the pixel displaying each color, and is connected to the shared pixel electrode from the side in substantially the same direction. It is characterized in that a row is formed as one cycle. According to this configuration, although uneven streaks occur depending on the driving method, the pitch at which the streaks occur is narrow and the width is also narrow. For this reason, the visibility of the uneven streaks is reduced and can be made inconspicuous.

Here, in the present invention, it is desirable that the parasitic capacitance of the pixel electrode is formed so as to be uniform over each pixel. Thus, in order to make the parasitic capacitance of the pixel electrode uniform over each pixel electrode,
The periphery of a pixel electrode may be formed by being surrounded by a conductive line connected to the pixel electrode, or the periphery of a pixel electrode other than the side opposite to an adjacent conductive line may be formed to have substantially the same width by a conductive line connected to the pixel electrode. For example, it is possible to form by surrounding. With such a configuration, the influence of potential transitions of adjacent conductive lines, adjacent pixel electrodes, and the like is reduced, so that a display image can be obtained with high definition, high quality, and uniformity.

In order to achieve the above object, according to the present invention, a scanning line and a data line are connected in series,
A liquid crystal display device in which a plurality of pixel electrodes corresponding to pixels displaying different colors are arranged by being shifted by approximately half a pitch for each row, and arranged in a column direction among the scanning lines or the data lines. Conductive lines are formed over a pixel electrode corresponding to a pixel that displays each color and are connected to each shared pixel electrode from the side in substantially the same direction, and are formed in a pattern having four rows as one cycle. It is characterized by.

In the present invention, it is preferable that the data line is connected to a pixel electrode shared by the data line via a switching element, and the switching element is a conductor / insulator / conductor. It is desirable that the thin film diode element be made of This makes it possible to obtain a uniform display image even when using a thin-film diode element in which it is difficult to form a storage capacitor in parallel with the pixel electrode as the nonlinear element.

In order to achieve the above object, according to the present invention, a scanning line and a data line are connected in series,
And, a plurality of pixel electrodes corresponding to the pixels that display different colors, electronic equipment equipped with a liquid crystal display device arranged to be shifted by approximately half a pitch for each row, among the scanning lines or the data lines, The conductive lines arranged in the column direction extend over the pixel electrodes corresponding to the pixels displaying each color, and are connected to the shared pixel electrodes from the side in substantially the same direction. It is characterized by being formed.

[0037]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> First, a wiring pattern of a liquid crystal display device according to a first embodiment of the present invention will be described. FIG. 1 is a plan view showing this wiring pattern.
As shown in this drawing, the wiring pattern is such that one data line 212x is shared by the pixels corresponding to the three colors of RGB, while each pixel has a capacity only for the data line wired on the right side. FIG. 14
14C is common to the wiring pattern shown in FIG. 14C, except that each data line is formed in a 4-row cycle.
This is different from the wiring pattern shown in FIG. For example, in the figure, the data line 212x goes from the R pixel electrode located in the A row to the B pixel electrode located in the C row in the lower left direction, and then to the R pixel electrode located in the A row. You are going right below. Data line 212x is thus A
It extends in the column direction in a folded pattern in which four pixel electrodes extending from row D to row D have one cycle, and is shared by the pixel electrodes of one column in macroscopic view. Data lines 212 (x-1) and 212 (x + 1) adjacent to data line 212x
Are formed in a similar pattern except that the color correspondence is different.

Next, the superiority of such a wiring pattern will be examined. First, in the case of displaying cyan in the normally white mode in the wiring pattern of the present embodiment, FIG. 2A shows the density fluctuation when each pixel electrode is driven in the same manner as in FIG. Shown in
It is to be noted that such a density fluctuation has already been described, and thus will not be described.

As shown in FIG. 2A, rows A and B are composed of a G pixel having a large variation in density and a B pixel having a small variation in density, and therefore have the same density of cyan. On the other hand, rows C and D each include a G pixel having a small density variation and a B pixel having a large density variation.
Although cyan has the same density as each other, the pixel densities of G and B are different from those of the rows A and B. That is, when displaying cyan, the density of cyan displayed on the rows A and B and the density of cyan displayed on the rows C and D are different from each other. I understand. However, the generated pitch and width are every three lines in the conventional wiring pattern shown in FIG. 2B, but are every two lines in the present embodiment, so that the visibility of the uneven streaks is reduced. For this reason, in the present embodiment, it becomes possible to make the stripes less noticeable than in the related art. The same applies to the case where yellow and magenta are displayed.

The linear unevenness in the row direction is shown in FIG.
In the case of the wiring pattern 2 (a) or (b), since the wiring pattern is for each row, this is advantageous at first glance.
It should be noted that, in the wiring pattern of (a) or (b), stripes also occur in the column direction. In the wiring pattern according to the present embodiment, since no streak occurs in the column direction, it can be seen that the streak visibility is the lowest as a whole.

<Second Embodiment> In the wiring pattern of the first embodiment, only the case where adjacent pixels are capacitively coupled has been described. However, actually, the pixel electrode and the pixel electrode are not connected to the pixel electrode. Capacitive coupling also occurs between the data line and the data line facing the pixel electrode. Here, in the first embodiment, the parasitic capacitance of the pixel electrode with respect to the opposing data line varies for each row. For details,
When the opposing data line surrounds in a U-shape like a pixel electrode located in row A, the parasitic capacitance increases, while a straight line like a pixel electrode located in row C appears. When only the data line is adjacent, the parasitic capacitance becomes small. Then, when the opposing data lines are surrounded in the shape of “L” like the pixel electrodes located in the B and D rows,
The parasitic capacitance has an intermediate value. As described above, since the parasitic capacitance of the pixel electrode differs for each row, there is a problem that a display image cannot be uniformly obtained with the wiring pattern of the first embodiment.

This problem is particularly remarkable when a two-terminal nonlinear element such as a thin film diode (TFD) is used as the switching element. The reason is that thin film transistors (TFTs)
or), it is relatively easy to form a sufficient storage capacitance in parallel with the liquid crystal layer so that the parasitic capacitance of the pixel electrode can be ignored, whereas a two-terminal nonlinear element In such a case, it is difficult to form such a storage capacitor, so that the difference in the parasitic capacitance in each pixel electrode directly appears as a non-uniform image quality.

Therefore, a second embodiment which solves this problem will be described. FIG. 3 is a plan view showing a layout of an element substrate in the liquid crystal display device according to the second embodiment. As shown in this figure, the wiring pattern itself is the same as in the first embodiment, but the data line 2
12x is different in that the periphery of the shared pixel electrode 234 is surrounded for each pixel electrode, and the pixel electrode 234 is connected to the pixel electrode 234 via the TFD element 220.

Here, the configuration of one pixel will be described by taking as an example a configuration connected to the data line 212x and located in the B-th row. FIG. 4A is a plan view showing a layout for one pixel, and FIG. 4B is a cross-sectional view taken along the line AA. As shown in these figures,
The TFD element 220 includes a first TFD element 220a and a second TFD element 220b.
The insulating film 201 formed on this surface and the first metal film 22
2, an oxide film 224 as an insulator formed on the surface by anodic oxidation, and second metal films 226a and 226b formed on the surface and separated from each other. Further, the second metal film 226a is used as it is for the data line 2
12x, while the second metal film 226b is
34.

By the way, the first TFD element 220a is arranged in order from the data line 212x to the second metal film 226a /
Since the oxide film 224 / the first metal film 222 has a sandwich structure of metal / insulator / metal, it has diode switching characteristics in both positive and negative directions. On the other hand, the second TFD element 220b becomes a first metal film 222 / oxide film 224 / second metal film 226b when viewed in order from the data line 212x, and the first TFD element 220a
Has opposite diode switching characteristics. Here, since both have a form in which two diodes are connected in series in opposite directions, one TFD
Compared with the case where an element is used, the non-linear characteristic of current-voltage is symmetrical in both positive and negative directions.

The cross section of the data line 212x is a first metal film 222, an oxide film 224, and a second metal film 226a. The terminal connected to the data line 212x is the uppermost second metal film. Since it is connected only to the 226a, the data line 212x does not function as a TFD element.

The element substrate 200 itself has insulating properties and transparency, and is made of, for example, glass or plastic. Here, the reason why the insulating film 201 is provided is to prevent the first metal film 222 from peeling off from the base by heat treatment after the deposition of the first metal film 222, and to diffuse impurities into the first metal film 222. This is to prevent it. Therefore, when these do not matter, the insulating film 201 can be omitted. The pixel electrode 234 is formed of a transparent conductive film such as ITO (Indium Tin Oxide) when used for a transmissive liquid crystal display panel, and is formed of aluminum or silver when applied to a reflective liquid crystal display panel. Is formed from a metal film having a high reflectance.

Further, for the pixels located in the D row,
The same is true except that the encircling portion of the data line 212x is symmetrical, and the same applies to the pixels located in the row A or C except that the enclosing portion of the data line 212 is symmetrical only in the upper half or lower half.

Next, the manufacturing process of such an element substrate 200 will be described focusing on the TFD element 220.
First, as shown in FIG. 5A, an insulating film 201 is formed on the upper surface of the substrate 200. The insulating film 201 is made of, for example, tantalum oxide, and is formed by a method of thermally oxidizing a tantalum film deposited by a sputtering method, a sputtering method using a target made of tantalum oxide, or a co-sputtering method. This insulating film 201
Is provided mainly for the purpose of improving the adhesion of the first metal film 222 and preventing the diffusion of impurities from the substrate 200, as described above, and the thickness thereof is, for example, about 50 to 200 nm. Is enough.

Next, as shown in FIG. 2B, a first metal film 222 is formed on the upper surface of the insulating film 201. The composition of the first metal film 222 is made of, for example, tantalum alone or a tantalum alloy. When using a tantalum alloy,
In the main component tantalum, for example, tungsten, chromium,
Elements belonging to Groups 6 to 8 in the periodic table such as molybdenum, rhenium, yttrium, lanthanum, and dysprosium may be added. The element to be added is preferably tungsten, and its content is desirably, for example, 0.1 to 6% by weight.

The first metal film 222 can be formed by a sputtering method, an electron beam evaporation method, or the like. When the first metal film 222 made of a tantalum alloy is formed,
A sputtering method using a mixed target, a co-sputtering method, an electron beam evaporation method, or the like is used. The thickness of the first metal film 222 is selected as appropriate depending on the application of the TFD element 220, and is generally about 100 to 500 nm.

Then, as shown in FIG. 3C, the first metal film 222 is patterned by commonly used photolithography and etching techniques.

Subsequently, an oxide film 224 is formed on the surface of the first metal film 222, as shown in FIG. Specifically, the surface of the first metal film 222 is formed by oxidation by an anodic oxidation method. At this time, the data line 21
The surface of the base portion of 2x is also oxidized at the same time, and an oxide film 224 is formed. The preferred thickness of the oxide film 224 is selected depending on its use, for example, about 10 to 35 nm, which is half that in the case where one TFD element is used for one pixel. The chemical conversion solution used in the anodic oxidation is not particularly limited, but for example, a citric acid aqueous solution of 0.01 to 0.1% by weight can be used.

Next, a second metal film 226 is formed as shown in FIG. This second metal film 226
Is, for example, chromium, aluminum, titanium, molybdenum, or the like, and is formed by depositing by a sputtering method or the like. Also, the second metal film 226
Is, for example, about 50 to 300 nm.

Subsequently, as shown in FIG. 6 (6), the second metal film 226 is patterned by commonly used photolithography and etching techniques. As a result, the second and third TFD elements
The metal films 226a and 226b are formed apart from each other, and the uppermost layer on the data line 212x is also formed on the second metal film 22.
6 will be covered.

Next, as shown in FIG. 7 (7), a conductive film to be the pixel electrode 234 is formed. This conductive film is
For a transmissive liquid crystal display panel, ITO is preferable, and for a reflective liquid crystal display panel, aluminum or the like is preferable.
A film is formed by depositing at 0 nm.

Subsequently, as shown in FIG. 8 (8), the conductive film is patterned by commonly used photolithography and etching techniques to form a pixel electrode 234.

Then, as shown in FIG. 9 (9), the wavy line portion 229 of the oxide film 224 branched from the data line 212x becomes the first metal film 2 on which the data line 212x is based.
Along with 22, it is removed by commonly used photolithography and etching techniques. Thereby, the first metal film 2 shared by the first and second TFD elements
22 is the first metal film 22 that is the lowermost layer of the data line 212x.
2 will be electrically separated from them.

According to such a process, the first TFD element 220a and the second TFD element 22
0b are formed in a delta arrangement together with the pixel electrodes 234.

Incidentally, the manufacturing process of such a TFD element is not limited to the order of the above steps. For example,
Immediately after the oxide film 224 is formed on the surface of the first metal film 222 by the step of FIG. 5D, the oxide film 224 is separated from the data line 212x by the step of FIG. And (6) to (8) in FIG.
It is also possible by executing the steps of

Then, the element substrate 2 thus configured
In 00, a counter substrate on which a scanning line extending in the row direction intersecting with the pixel electrode 234 and a color filter of each color corresponding to the pixel electrode 234 are formed, a certain gap is formed by a sealant and a spacer. (Gap), and further, in this closed space, for example, TN (Twiste
d Nematic) type liquid crystal is sealed, and finally, a liquid crystal display device is formed.

In such a liquid crystal display device, the periphery of the pixel electrode 234 connected to the data line 212x is surrounded by the data line 212x itself, so that the adjacent data line 212 (x-1) or 212 (x + 1). ) Eliminates the effects of capacitive coupling. That is, only the connection with the own data line 212x becomes a problem. The same applies to the pixel electrodes 234 connected to the adjacent data lines 212 (x-1) and 212 (x + 1). Therefore, according to such a liquid crystal display device, since the parasitic capacitances of the pixels located in the rows A to D become equal to each other, it is possible to achieve a uniform display image.

Third Embodiment Next, a liquid crystal display according to a third embodiment of the present invention will be described.

In the above-described second embodiment, since the periphery of the pixel electrode 234 is surrounded by the data line connected to the pixel electrode 234, there is no problem of capacitive coupling between adjacent data lines. For this reason, it can be said that it is excellent in terms of uniformity of the displayed image. However, as shown in FIG. 4A, two data lines, specifically, a line L1 of the data lines 212x and a data line 212 adjacent thereto are provided between the pixel electrodes 234 adjacent to each other. (X
As a result of wiring the line L2 of (+1), the possibility of a short circuit increases in the patterning step of the first metal film 222 and the patterning step of the second metal film 226 described above, and furthermore, the area occupied by the pixel electrode 234. (Aperture ratio) decreases, and the entire screen becomes dark.

Therefore, a second embodiment will be described in which the parasitic capacitances of the pixel electrodes located in each row are equalized, and the problems of the short circuit and the aperture ratio in the first embodiment are solved.

FIG. 7 is a plan view showing a layout of an element substrate in the liquid crystal display device. As shown in this figure, the pixel electrodes 234 corresponding to the respective colors of RGB are RGB.
The second embodiment is the same as the first embodiment in that a B-delta arrangement is adopted. However, the data line does not surround the entire periphery of the pixel electrode, and only three sides other than the side facing the adjacent data line have a “コ”. It differs from the first embodiment in that it is surrounded by lines of the same thickness in a character shape.

Here, the configuration of one pixel will be described by taking as an example a configuration connected to the data line 212x and located in the B-th row. FIG. 8A is a plan view showing a layout for one pixel.

As shown in this figure, one pixel in the second embodiment eliminates the line L1 and the area M1 in the first embodiment, and connects the pixel electrode 234 with the line L1 as shown by the arrow. The configuration has been expanded to include Therefore, between adjacent pixel electrodes 234, adjacent data lines (line L
Since only 2) is wired, the possibility of a short circuit in the patterning process is reduced, while the area of the pixel electrode 234 is increased while the pixel spacing is maintained, so that the aperture ratio is improved.

By the way, the deletion of the area M1 does not directly lead to the point of preventing the short circuit and the point of improving the aperture ratio. However, if this region M1 is not deleted, the thickness of the line surrounding the pixel electrode 234 will not be uniform.
Further, this thickened portion differs from the pixel in row B as shown in FIG. 8A and the pixel in row C as shown in FIG. Therefore, the parasitic capacitance also differs for each row. Therefore, the area M1 is intentionally deleted.

With such a configuration, the pixel electrodes 234 located in each row have three sides surrounded by lines having the same thickness, and only the other side is capacitively coupled to the adjacent data line. The capacities are equal to each other.
Therefore, according to the liquid crystal display device according to the third embodiment, it is possible to prevent a short circuit of the pattern and a decrease in the aperture ratio, and to achieve a uniform display image.

In the liquid crystal display devices according to the second and third embodiments, the TFD element 220
Is connected to the first TFD element 2
Although the second TFD element 20a and the second TFD element 220b are used, it is needless to say that one TFD element may be used.

In each of the liquid crystal display devices according to the second and third embodiments, the second metal film 226 and the pixel electrode 234 are formed of different metal films.
The second metal film and the pixel electrode may be made of the same conductive film such as an ITO film or an aluminum film. According to such a configuration, there is an advantage that the second metal film 226 and the pixel electrode 234 can be formed in the same process.

In addition, in the liquid crystal display devices according to the second and third embodiments, both the TFD elements 22
0 was connected to the data line side, but conversely,
The same applies to a configuration in which the TFD element 220 is connected to the scanning line side.

<Electronic Equipment> Next, some examples in which the above-described liquid crystal display device is used in electronic equipment will be described.

<Part 1: Pager> First, a pager using this liquid crystal display device will be described. FIG. 9 is an exploded perspective view showing the structure of this pager. As shown in this figure, the pager 1300 includes a liquid crystal display device 100 in a metal frame 1302 and a backlight 1306.
The light guide 1306 including a, the circuit board 1308, and the first and second shield plates 1310 and 1312 are housed together. And in this configuration,
The continuity between the liquid crystal display device 100 and the circuit board 1308 is established by the film tape 1314 for the element substrate 200 and the film tape 1318 for the opposing substrate 300.
Respectively.

<2: Mobile Computer> Next, an example in which the liquid crystal display device is applied to a mobile computer will be described. FIG. 10 is a front view showing the configuration of the computer. In the figure, a computer 1200 includes a main body 1 having a keyboard 1202.
204 and a liquid crystal display 1206. The liquid crystal display 1206 is configured by adding a backlight to the back surface of the above-described liquid crystal display device.

Note that, in addition to the electronic devices described with reference to FIGS. 9 and 10, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, an electronic organizer, a calculator, a word processor, Workstations, mobile phones, video phones, POS terminals,
A device including a touch panel and the like are examples of the electronic device. It goes without saying that the present invention can be applied to these various electronic devices.

[0079]

As described above, according to the present invention, uneven streaks are generated depending on the driving method. However, since the pitch at which the streaks are generated is narrow and the width thereof is also narrow, the visibility of the streaks is reduced and becomes inconspicuous. . Therefore, it is possible to achieve higher definition and higher image quality of the display image.

[Brief description of the drawings]

FIG. 1 is a plan view showing a wiring pattern of a liquid crystal display device according to a first embodiment of the present invention.

2A is a diagram showing the occurrence of unevenness in the same wiring pattern, and FIG. 2B is a diagram showing the occurrence of unevenness in a conventional wiring pattern.

FIG. 3 is a plan view showing a layout of an element substrate in a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4A is a partially enlarged view showing a layout for one pixel in the liquid crystal display device, and FIG. 4B is a cross-sectional view taken along line AA.

FIGS. 5 (1) to 5 (5) are diagrams showing a manufacturing process of a TFD element in the same liquid crystal display panel.

FIGS. 6 (6) to (9) are diagrams showing a manufacturing process of a TFD element in the same liquid crystal display panel.

FIG. 7 is a plan view showing a layout of an element substrate in a liquid crystal display device according to a third embodiment of the present invention.

FIGS. 8A and 8B are partial enlarged views each showing a layout for one pixel in the liquid crystal display device. FIGS.

FIG. 9 is an exploded perspective view showing a configuration of a pager as an example of an electronic apparatus to which the liquid crystal display device according to the embodiment is applied.

FIG. 10 is a front view illustrating a configuration of a personal computer as an example of an electronic apparatus to which the liquid crystal display device according to the embodiment is applied.

FIGS. 11A to 11D are diagrams each showing a general arrangement of pixel patterns of a color filter.

FIGS. 12A and 12B are diagrams showing a wiring pattern for routing a line to each pixel in an RGB delta arrangement.

FIG. 13 is a diagram showing a wiring pattern for routing a line to each pixel in an RGB delta arrangement.

FIGS. 14A to 14C are diagrams showing patterns for routing lines to each pixel in the RGB delta arrangement.

[Explanation of symbols]

212 (x-1), 212x, 212 (x + 1) ... data line 220 ... TFD element 222 ... first metal film 224 ... insulating film 226 ... second metal film L1, L2 ... line M1 ... region

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H091 FA04Y FC02 FC26 FD04 FD24 GA13 HA07 LA15 LA16 2H092 JA03 JA07 JB12 JB23 JB32 JB44 KA08 KB05 KB14 MA05 MA14 MA15 MA16 MA18 MA19 MA20 MA24 MA32 MA35 MA37 NA02 NA07 NA25 NA0 QQ AA06 AB02 BA10 BA35 5C060 BC01 DA01 5C094 AA03 AA09 BA03 BA43 EA10

Claims (8)

[Claims] 1. A liquid crystal display device in which pixel electrodes corresponding to pixels displaying different colors are arranged by being shifted by about a half pitch for each row, wherein a conductive line shared in a column direction in the pixel electrodes is: A liquid crystal display device comprising: a pixel electrode corresponding to a pixel displaying each color; and a common pixel electrode connected to the common pixel electrode from a side substantially in the same direction. 2. The liquid crystal display device according to claim 1, wherein the parasitic capacitance of the pixel electrode is formed so as to be uniform over each pixel. 3. The liquid crystal display device according to claim 1, wherein the periphery of the pixel electrode is surrounded by a conductive line connected to the pixel electrode. 4. The pixel electrode according to claim 1, wherein the periphery of the pixel electrode other than the side opposite to the adjacent conductive line is surrounded by a conductive line connected to the pixel electrode with substantially the same width. Liquid crystal display. 5. A liquid crystal display in which a plurality of pixel electrodes connected in series between a scanning line and a data line and corresponding to pixels displaying different colors are arranged by being shifted by approximately half a pitch for each row. The device, wherein, among the scanning lines or the data lines, conductive lines arranged in a column direction extend over pixel electrodes corresponding to pixels displaying each color, and are substantially in the same direction with respect to each shared pixel electrode. A liquid crystal display device, wherein the liquid crystal display device is formed in a pattern in which four rows are connected to each other from one side. 6. The liquid crystal display device according to claim 5, wherein the conductive lines are respectively connected to pixel electrodes shared by the conductive lines via switching elements. 7. The liquid crystal display device according to claim 6, wherein the switching element is a thin film diode element composed of a conductor / insulator / conductor. 8. A liquid crystal display in which a plurality of pixel electrodes connected in series between a scanning line and a data line and corresponding to pixels displaying different colors are arranged by being shifted by approximately half a pitch for each row. An electronic device including a device, wherein, among the scanning lines or the data lines, a conductive line arranged in a column direction extends over a pixel electrode corresponding to a pixel displaying each color, and for each shared pixel electrode. An electronic device, wherein the electronic device is formed in a pattern in which four rows are defined as one cycle by being connected from substantially the same direction.