JP2002040475A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal device which has lead-around wires having small shading unevenness while the area use efficiency of the lead-around wires is high. SOLUTION: The liquid crystal display device has electrodes 21 to 28 which are wired in parallel on a substrate 12 holding a liquid crystal layer, terminals 31 to 38 which are led out to an end part of the substrate 12 and connected to a driving element, and lead-around wires which connect the electrodes 21 to 28 and terminals 31 to 38. The electrodes 21 to 28 and terminals 31 to 38 are different in pitch and electrically connected by the lead-around wires. Straight wires 11 to 18 are provided not in parallel to the electrodes 21 to 28 and the straight wires 11 to 18 are nearly parallel to one another.

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 of a simple matrix type or an active matrix type, and more particularly to a liquid crystal display device having a lead-out line for connecting an electrode of a liquid crystal display element to a driving element.

[0002]

2. Description of the Related Art In a liquid crystal display device, for example, an insulating substrate (electrode substrate and electrode substrate) made of two transparent glasses is provided at a predetermined gap so that the surfaces on which a display transparent pixel electrode and an alignment film are laminated face each other. The two substrates are bonded together with a sealing material provided in a frame shape around the edge between the two substrates, and the sealing material between the two substrates is inserted through a liquid crystal sealing opening provided in a part of the sealing material. A liquid crystal display element in which liquid crystal is sealed and sealed inside, and a polarizing plate is further provided outside both substrates (that is, a liquid crystal display section; a liquid crystal display panel; an LCD: liquid crystal display element).
Crystal display), and a backlight that is arranged below the liquid crystal display element and supplies light to the liquid crystal display element,
A circuit board for driving the liquid crystal display element, which is disposed outside the outer peripheral portion of the liquid crystal display element, a frame-shaped body which is a molded product holding these members, and a liquid crystal display window which accommodates these members. It is configured to include an opened metal frame and the like.

A liquid crystal display element and a driving circuit board are, for example, a tape carrier package (hereinafter referred to as TCP) on which a semiconductor integrated circuit chip for driving a liquid crystal display element is mounted.
) Are electrically connected. More specifically, a number of output terminals of the circuit board and a number of input terminals (input side outer leads) of the TCP are connected by soldering, and a number of output terminals (output side outer leads) of the TCP and the display electrodes are connected to each other. Many input terminals of the liquid crystal display element to be connected (one of the transparent glass substrates constituting the liquid crystal display element, that is, arranged at the end on the electrode substrate surface) are connected by an anisotropic conductive film. . Also, many input terminals of the semiconductor integrated circuit chip mounted on the TCP are:
Many output terminals of the semiconductor integrated circuit chip are connected to a number of output inner leads of the TCP.
Are connected to a number of input inner leads.

[0004] Documents describing such a liquid crystal display device include, for example, JP-A-61-214548,
Japanese Utility Model Laid-Open Publication No. Hei 2-13765 and the like.

[0005]

FIG. 16 shows a part of a wiring formed on an electrode substrate constituting a conventional liquid crystal display element, that is, a connection terminal between a display electrode and a TCP electrode, and FIG. 4 is a schematic plan view of a main part showing a lead wiring connecting the both.

Reference numeral 12 denotes a liquid crystal display element (not shown here).
11, the electrode substrate made of an insulating substrate made of one transparent glass constituting the reference numeral 62 reference) in FIG. 14, 2 ₁ ~
2 ₈ is formed on the surface of the electrode substrate 12, a transparent conductive film, in parallel lines, the display electrodes constituting the pixel, 3
_{1-3 8} is not shown in the TCP (where a driving element.
10, reference numeral 10 references) of the electrode (the output side outer lead) and connected thereto terminal (connection electrode 11, i.e., the input _terminal), 1 1 to 1 ₈ connects the display electrode 2 and the terminal 3 Diagonal straight wiring, 71
Is a TCP alignment mark when TCP is mounted on the electrode substrate 12, and 72 is a mark for mounting on the electrode substrate 12.
The center line 52 of the terminal group corresponding to each TCP is a portion where the sealing material is provided.

In the electrode substrate 12 constituting the liquid crystal display element, the arrangement pitch of the TCP electrodes is usually narrower than the arrangement pitch of the display electrodes 2 wired in parallel, that is, the connection pitch with the TCP electrodes. The terminals 3 are formed with a smaller pitch. Therefore, the leading wiring connecting the display electrode 2 and the terminal 3 is the oblique straight wiring 1. As shown in FIG. 16, in the conventional lead-out wiring, the oblique straight wiring 1 (with respect to the display electrode 2 or the terminal 3)
Both the angle and the width of the oblique straight wiring 1 are adjusted so that the wiring resistance of the lead wiring is equal to each other. Such a lead-out wiring is called a radial wiring.

[0008] Such a conventional technique has the following problems.

That is, there is a problem that the area use efficiency (wiring efficiency) of the lead wiring on the electrode substrate 12 is low, the length of the lead wiring is long, and the wiring resistance is large. If the length of the lead-out wiring is to be shortened, the width of the lead-out wiring must be reduced in order to obtain a clearance (interval) between the lead-out wirings. At present, the wiring resistance of the lead wiring is, for example, 500 to 1 kΩ. 500-70 of the output resistance of the driving semiconductor IC chip
It is large compared to 0Ω.

[0010] Further, since a plurality of TCP terminals (electrodes) arranged in a line on the end of the electrode substrate 12 and a group of three terminals to be connected are spaced, for example, ITO
Depending on the thickness of the terminal 3 made of (indium-tin-oxide; nesa) film, there is a difference in height between a portion where the terminal 3 exists and a portion where the terminal 3 does not exist. The film thickness of ITO is as thick as 0.2 to 0.3 μm. Thereby, during mass production of the liquid crystal display element, this shape is transferred to a rubbing roller that performs alignment processing (rubbing) on an alignment film formed on the display electrode 2, and when the alignment processing is performed using the rubbing roller, the alignment is performed. Rubbing stripe unevenness occurs in the film, and as a result, there is a problem that display quality is deteriorated.

Further, since the diagonal straight wirings 1 of the lead wirings are wired in a radial pattern, the interval between the diagonal straight wirings 1 becomes narrower from the display electrode 2 to the terminal 3 as shown in FIG. Occurs. As a result, the inside of the sealing material 52 of the completed liquid crystal display element (the side where the liquid crystal intervenes)
Therefore, there is a problem that unevenness in shading is generated in a portion that is a so-called frame portion, which is a non-lighting portion outside the display portion (lighting portion), where a black portion should be originally uniform. .

Further, a plurality of display electrodes 2 of the display section
Are wired in parallel at equal intervals, so that the wiring density is uniform. On the other hand, as described above, the radial oblique straight wiring 1 is not uniform in wiring density.
(Super Twisted Nematic)-Like LCD, high precision gap between both electrode substrates (± 0.1 μm)
In a liquid crystal display device which requires the above, the effective density at which the spacer for forming the gap functions is greatly affected. Therefore, in the conventional radial oblique straight wiring 1, the wiring density is generally lower than that of the display unit, and color unevenness due to the gap variation of the frame portion occurs. That is, as described above, the transparent electrode is usually formed of a thick ITO film having a thickness of 0.2 to 0.3 μm. Since the display electrodes 2 and the oblique straight wirings 1 made of the ITO films of the upper and lower electrode substrates support the spacers, the spacers where there is no electrode are free, and there is a problem that gap control is not effective.

References describing such techniques include, for example, JP-A-3-289626 and JP-A-4-289.
70627, JP-A-4-170522, JP-A-4-170522
No. 369622 and JP-A-5-127181.

A first object of the present invention is to provide a liquid crystal display device having a high efficiency in using the area of the lead wiring, and having a short lead wiring with low resistance.

A second object of the present invention is to provide a liquid crystal display device in which rubbing stripe unevenness does not occur in a display section.

A third object of the present invention is to provide a liquid crystal display device having a uniform black non-lighting area without uneven shading in the frame portion.

A fourth object of the present invention is to provide a liquid crystal display device in which a gap between both substrates can be controlled well and color unevenness does not occur.

[0018]

In order to achieve the first object, the present invention comprises a plurality of electrodes which are respectively wired in parallel on a substrate, and is drawn out to an end of the substrate, and A terminal of each of the electrodes connected to a driving element,
In a liquid crystal display device including a liquid crystal display element having a pitch of the electrodes and a pitch of the terminals different from each other, and a lead wire connecting the electrodes and the terminals, the lead wire is formed of the electrode From the terminal, the part directly extended from the terminal, and the two extended parts are connected to each other, and are formed of diagonal straight wirings substantially parallel to each other, and the wiring resistance of the lead wiring is So that they are almost equal,
The length of the two extended portions and the width of the diagonal straight wiring are adjusted and formed.

Further, according to the present invention, a plurality of electrodes each wired in parallel on an insulating substrate, and a terminal of each of the electrodes, which is led out to an end of the insulating substrate and connected to a driving element, are provided. A liquid crystal display device comprising a liquid crystal display element having a pitch of the terminals smaller than a pitch of the electrodes, and an oblique straight line connecting the electrodes and the terminals. The part directly extended from the electrode and the part directly extended from the terminal are connected by the oblique straight line wiring having substantially the same angle with respect to the electrode or the terminal, and the two extended parts and the oblique straight line are included. The length of the two extended portions and the width of the oblique straight wiring are calculated and formed so that the wiring resistances become substantially equal to each other.

Further, it is characterized in that the lengths of the intervals between the portions directly extended from the adjacent electrodes are substantially equal.

Further, the length of the interval between the adjacent oblique straight wirings is substantially equal.

According to another aspect of the present invention, a plurality of the driving elements are mounted side by side on the substrate so as to be connected to the terminals and connected to the driving elements. A terminal group consisting of a plurality of the terminals is disposed on the substrate at a second interval wider than a first interval between the terminals, and a first group is disposed at a location at the second interval. A dummy electrode is formed.

Further, the first dummy electrode includes at least one dummy parallel electrode formed at substantially the same pitch and substantially the same width as the terminals and substantially parallel to the terminals.

Further, the first dummy electrode includes a dummy oblique straight line electrode substantially parallel to the oblique straight line formed between the outermost oblique straight lines of the adjacent terminal group. .

[0025] The first dummy electrode may include a plurality of dummy parallel electrodes formed at substantially the same pitch and substantially the same width as the terminals and substantially parallel to the terminals.
It is characterized by comprising at least two dummy oblique straight electrodes substantially parallel to the oblique straight wires on both sides formed between the outermost oblique straight wires of the adjacent terminal group.

Further, in order to achieve the third and fourth objects, the present invention relates to a method in which a second dummy electrode is formed between an adjacent terminal or a portion directly extended from the terminal. Features.

[0027] The distance between the second dummy electrode and the terminal on either side of the second dummy electrode or a portion extended from the terminal as it is is substantially equal to each other.

The distance between the second dummy electrode and the terminal on either side of the second dummy electrode or a part extended from the terminal is substantially equal to each other, and the distance between the second dummy electrode and the portion extending from the adjacent diagonal electrode is substantially the same. It is characterized by being substantially equal to the length of the interval between the straight wirings.

Further, the first and second dummy electrodes include at least one material layer identical to the terminal.

Further, of the two substrates, at least a part of the terminal, the lead-out wiring and the dummy electrode formed at an end of one of the substrates is formed on an opposite surface of the other substrate. It is characterized by the following.

[0031]

By forming the extraction wiring as described above, the area use efficiency (wiring efficiency) of the extraction wiring can be improved, and the length of the extraction wiring can be shortened. The wiring resistance of 1 kΩ can be reduced by about 30 to 40%. Further, the reduced amount can be provided as a margin of the on-resistance of the driving semiconductor IC chip, so that the size of the semiconductor IC chip can be reduced. Further, the length of the lead-out wiring can be made shorter than before, so that the size of the liquid crystal display element can be made smaller. As a result, manufacturing costs can be reduced. Furthermore, since the wiring resistance is reduced, distortion of waveforms for driving liquid crystal and distortion of crosstalk can be reduced, so that shadowing (luminance unevenness) can be reduced and display quality can be improved.

Also, the first dummy electrode is provided in a portion where a wide space is provided between the terminal groups connected to the plurality of TCPs arranged in a line on the end of the electrode substrate. The unevenness of the portion with and without the terminal is transferred to a rubbing roller that performs alignment processing (rubbing) on an alignment film formed on the display electrode, and rubbing stripe unevenness occurs on the alignment film, thereby deteriorating display quality. Can be prevented.
Further, since the first dummy electrode can eliminate the concave portion between the TCPs, the gap between the upper and lower substrates can be made uniform.

Further, since the second dummy electrode is provided between the plurality of terminals, it is possible to prevent light leakage from occurring between the terminals of the frame portion. In addition, the in-plane density of the terminal and a portion where the terminal is extended as it is becomes uniform, and the gap between the upper and lower substrates can be made uniform. Further, it is possible to prevent the occurrence of uneven shading of the frame portion which should be originally uniform black due to the non-uniformity of the conventional radial oblique straight wiring, and to make the frame portion uniform black. Therefore, display quality can be improved.

Further, since the first and second dummy electrodes are provided, the gap in the frame portion can be made uniform, so that color unevenness due to the gap variation in the frame portion does not occur and the display quality is improved. can do.

The above-mentioned JP-A-3-289626,
JP-A-4-70627, JP-A-4-170522,
JP-A-4-369622 and JP-A-5-127181 do not disclose the above-described concept, structure, operation, and effect of the present invention.

[0036]

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

FIG. 11 is an exploded perspective view showing a liquid crystal display element 62, a driving circuit for driving the liquid crystal display element 62, and a liquid crystal display module 63 in which light sources are compactly integrated.

The TCP 10 on which the semiconductor IC chip 34 for driving the liquid crystal display element 62 is mounted has a window for fitting the liquid crystal display element 62 in the center, and a frame-shaped body on which a circuit for driving liquid crystal is formed. It is mounted on a circuit board 35. Printed circuit board 3 fitted with liquid crystal display element 62
5 is fitted into a window of a frame 42 formed of a plastic mold, a metal frame 41 is superimposed on the window, and its claws 43 are bent into cutouts 44 formed in the frame 42 to form a frame 41. Is fixed to the frame 42.

A cold cathode fluorescent tube 36 disposed at the upper and lower ends of the liquid crystal display element 62; a light guide 37 made of an acrylic plate for uniformly irradiating the liquid crystal display cell 60 with light from the cold cathode fluorescent tube 36; A reflecting plate 38 formed by applying a white paint to a metal plate and a milky white diffusing plate 39 for diffusing light from the light guide 37 are fitted into the window of the frame 42 from the back side in the order shown in FIG. It is. An inverter power supply circuit (not shown) for lighting the cold-cathode fluorescent tube 36 is provided at a position (not shown) provided on the right-side back of the frame 42 so as to face the recess 45 of the reflector 38. )). Diffusing plate 3
9, light guide 37, cold cathode fluorescent tube 36 and reflector 38
The tongue piece 46 provided on the reflection plate 38 is
Is fixed by folding it into the fore-edge 47 provided in the front end.

FIG. 12 is a block diagram of a laptop computer using the liquid crystal display module 63 as a display unit, and FIG. 13 is a diagram showing a state in which the liquid crystal display module 63 is mounted on a laptop computer 64. In the laptop personal computer 64, the result calculated by the microprocessor 49 is used to drive the liquid crystal display module 63 by the liquid crystal driving semiconductor IC chip 34 via the control LSI 48.

FIG. 14 is a perspective view of a main part of the liquid crystal display element 62.

Referring to FIG. 14, the liquid crystal layer 50 is sandwiched.
In order to align the liquid crystal molecules in a spiral structure between the upper and lower electrode substrates 11 and 12 in contact with the liquid crystal on the transparent upper and lower electrode substrates 11 and 12 made of, for example, glass, For example, a method of rubbing the surfaces of the alignment films 21 and 22 made of an organic polymer resin made of polyimide in one direction with a cloth or the like, for example, a so-called rubbing method is employed.
The rubbing direction at this time, that is, the rubbing direction, the rubbing direction 66 in the upper electrode substrate 11, the lower electrode substrate 12
In, the rubbing direction 67 is the alignment direction of the liquid crystal molecules. A gap d is formed between the two upper and lower electrode substrates 11 and 12 thus oriented so that the rubbing directions 66 and 67 cross each other at substantially 180 to 360 degrees.
₁ , the two electrode substrates 11 and 12 are notched, ie, a notch for injecting liquid crystal,
When a nematic liquid crystal having a positive dielectric anisotropy and a predetermined amount of an optically rotatory substance is sealed in the gap therebetween, the liquid crystal molecules are interposed between the electrode substrates. A helical structure with a torsion angle θ ₂ is arranged. Note 31 and 32 on the respective example a transparent consisting of indium oxide or ITO, a lower electrode (lower electrode 32 corresponds to ₂ 1 to 2 ₈ in FIG. 1). A member that provides a birefringence effect above the upper electrode substrate 11 of the liquid crystal cell 60 thus configured (hereinafter, referred to as a birefringent member. Fujimura et al., “Phase Difference Film for STN-LCD”, Magazine Electronic Material 1)
40, and the upper and lower polarizers 15 and 16 are provided with the member 40 and the liquid crystal cell 60 interposed therebetween.

The twist angle θ ₂ of the liquid crystal molecules in the liquid crystal 50
Can take a value in the range of 180 degrees to 360 degrees, preferably 200 degrees to 300 degrees. However, the phenomenon that the lighting state near the threshold of the transmittance-applied voltage curve becomes an orientation that scatters light. From the practical viewpoint of avoiding and maintaining excellent time division characteristics, the range of 230 to 270 degrees is more preferable. This condition basically acts to make the response of the liquid crystal molecules to the voltage more sensitive and to realize excellent time division characteristics. The excellent refractive index anisotropy [Delta] n ₁ and the product [Delta] n ₁ · _{d 1} of the thickness _{d 1} of the liquid crystal layer 50 in order to obtain a display quality is preferably 1.0μm from 0.5 [mu] m, more preferably 0. It is desirable to set it in the range of 6 μm to 0.9 μm.

The birefringent member 40 functions to modulate the polarization state of light transmitted through the liquid crystal cell 60, and converts a liquid crystal cell 60, which could only be displayed in a colored state, into a black and white display. Thus the birefringent member 40 refractive index anisotropy [Delta] n ₂ and is extremely important product [Delta] n ₂ · _{d 2} of a thickness _{d 2,} preferably 0.8μm from 0.4 .mu.m, more preferably 0.5μm To a range of 0.7 μm.

Further, since the liquid crystal display element 62 utilizes elliptically polarized light due to birefringence, the axes of the polarizing plates 15 and 16 and the optical axis thereof when a uniaxial transparent birefringent plate is used as the birefringent member 40. And the electrode substrate 11 of the liquid crystal cell 60,
The relationship between the twelve liquid crystal alignment directions 6 and 7 is extremely important.

FIG. 15 is a partially cutaway perspective view of an example of an upper electrode substrate portion of a liquid crystal display device having a color filter.

As shown in FIG. 15, red, green and blue color filters 33R, 33G, 33B,
By providing the light shielding film 33D between the filters, multi-color display becomes possible.

In FIG. 15, each filter 33
On the R, 33G, 33B and the light shielding film 33D, a smooth layer 23 made of an insulator is formed to reduce the influence of these irregularities, and then an upper electrode 31 and an alignment film 21 are formed.

Embodiment 1 FIG. 1 is a partial plan view of an electrode substrate constituting a liquid crystal display device according to Embodiment 1 of the present invention. One TC mounted on an electrode substrate manufactured by an optimal algorithm according to the present invention.
FIG. 9 is a schematic plan view showing a part of a lead wiring on the right side from a center line of a terminal group corresponding to P. The driving element 1
The number of electrodes of TCP (tape carrier package)
Usually, the number is about 80 to 160, but in the embodiment, it is omitted in the figure. Even if the number is different, the configuration of the lead wiring according to the present invention can be applied as it is. FIG. 7A is a plan view showing a range about four times as large as that of FIG.

Reference numeral 12 denotes a liquid crystal display element (not shown here).
11 and FIG. 14).
An electrode substrate composed of an insulating substrate made of glass, 2₁~
2₈Is formed on the surface of the electrode substrate 12 and is made of a transparent conductive film.
Display electrodes that are wired in parallel and constitute pixels (Fig.
8, indicated by reference numeral 32 in FIG. 14), 3₁~ 3₈Is TCP
(Not shown here; see reference numeral 10 in FIGS. 10 and 11)
Terminal connected to the electrode (the output side outer lead)
(Connection electrode, ie, input terminal), 1₁~ 1 ₈Is a table
One of the terminal lead-out lines connecting the indicating electrode 2 and the terminal 3
The oblique straight line wiring which is a part, 71 is a TCP
2, the alignment mark of TCP when mounting on 2
Terminal corresponding to one TCP mounted on electrode substrate 12
The center line of the group, 52, is a portion where the sealing material is provided.

The pitch of the plurality of display electrodes 2 wired in parallel on the electrode substrate 12 is larger than the pitch of the plurality of display electrodes 2.
And the pitch of the terminals 3 of the display electrodes 2 connected to the TCP is smaller than that of the display electrodes 2. Therefore, a lead wiring 1 for connecting the two is required. Lead wiring
The portion directly extended from the display electrode 2, the portion directly extended from the terminal 3, and the two extended portions are connected to each other, and the angles θ with respect to the display electrode 2 and the terminal 3 are equal, that is, they are parallel oblique. The length of the two extended portions and the width of the diagonal straight wiring 1 are calculated and formed such that the wirings are composed of the straight wirings 1 so that the wiring resistances of the lead wirings are equal to each other.

There are four basic conditions for wiring.

All the diagonal straight wirings 1 are parallel lines having an angle θ (−θ on the left side of the center line 72). Center line 72
Is line symmetric with respect to. The angle θ is, for example, 25 to 50 °
It is.

[0054] The distance between the oblique straight line 1, all the wiring rule _{d LCD.} I can't afford it.

The terminals 3 have the same width over the entire length including the extension. The terminal 3 and the display electrode 2 are parallel (perpendicular to the terminal lead-out end of the electrode substrate 12 of the liquid crystal display element). The distance between terminals 3 is TCP crimping rule d
_{It is TCP} .

The display electrode 2 has the same width over the entire length including the extension. The distance between the display electrodes 2 is set to the TCP pressure bonding rule d _LCD .

Hereinafter, the configuration of the lead wiring 1 will be described in detail with reference to FIGS.

The wiring algorithm is as follows.

[0059] (1) First, the lead wires of the first run right from the center line 72, connecting the display electrodes _{2 1} and the terminal _{3 1} as linearly (see FIG. 2).

[0060] (2) Draw a line of any angle θ by starting from the end C ₁ of the display electrode 2 _1.

[0061] (3) extension of the angle θ from _{C 1} and the terminal 3
To the point of intersection of an extension of the B _1.

[0062] (4) and the extension line of the terminal _{3 2,} line _B 1 -C
Distance between ₁ Find the _{A 2} to be _{d LCD.}

[0063] (5) by the _{A 2} starting from draw a line of angle theta (a line parallel with the line segment _B 1 -C _1), the intersection of the extended line of the display electrode _{2 2} and _{D 2.}

[0064] (6) arbitrarily determine the width _{w 1} of the diagonal straight line wiring _{1 1.}

[0065] (7) the distance between the line segment _A 2 -D ₂ pulls the _{w 2} become (parallel to the line _A 2 -D ₂₎ wire, intersection of the lines and terminals _{3 2} extension lines and B _2, the intersection of the extension line of the display electrode _{2 2} and _{C 2.}

(8) Line segment A₁-B₁E is the middle point of₁,line segment
D₁-C₁The middle point of F₁, Line segment A₂-B₂The midpoint of
E₂, Line segment D₂-C₂The middle point of F₂And E₁And E₂When
The distance on the y-axis of₁, Line segment E₁-F₁M₁,
Similarly, the line segment E₂-F₂M ₂, F₂The y-axis component of
P₂And

(9) In order to satisfy the following formula,
Request oblique straight line _{1 2} of width _{w 2} of the drawing wiring. In other words, decide w ₂ under conditions such as the wiring resistance of a single eyes 2 knots of drawing wire are equal. W _TCP is TCP
Width to the width of the terminal 3 which is determined in accordance with the electrodes, W _LCD
Is the width of the display electrode 2, and R _sq is the sheet resistance (Ω / □) of the electrode wiring material.

[0068]

(Equation 1) (10) B ₂ determined by w ₂ obtained by the above formula
And C ₂ as the final coordinates.

(11) The first and second lead-out wirings have been determined.

(12) Next, the third lead-out wiring may be determined in the same manner as in (2) to (10). However, the calculation formula for determining the width w ₃ of the oblique straight line 1 _3, using the following formula.

[0071]

(Equation 2) (13) Hereinafter, this process is repeated to sequentially obtain the n-th lead wiring. To determine the width w _n of the oblique straight line 1 _n, using the following formula.

[0072]

(Equation 3) (14) Coordinates A _n to the last n-th lead wiring,
B _{n, E} n, the _{D n} are determined from the following equation to determine the wiring resistance R of the n-th drawing wires.

[0073]

(Equation 4) (15) The coordinate _{Bn of the n-th} lead wiring determines the height of the y-axis of the entire oblique straight wiring pattern. That is, in the lead-out wiring to the first run ~n-1 -th, extending the terminal ₃ 1 _{to 3 n-1} in accordance with the _{B n.} Then 1
The wiring resistances of the first to n-th lead wirings are all equal to R.

(16) Finally, a numerical calculation is performed using the angle θ as a variable to determine the angle θ that minimizes the wiring resistance R.
At this time, the coordinates A of the first to n-th lead wirings
_{1, B 1, E 1,} D 1 ~A n, B n, E n, which graphically up _{D n.}

The coordinates A _{1 of the first} lead-out wiring,
B ₁ , E ₁ , and D ₁ are obtained by the following formulas.

[0076]

(Equation 5) The coordinates A ₁ , B ₁ , E ₁ , and
The following detailed formula for D _1.

[0077]

(Equation 6) Also, coordinates A ₂ , B ₂ , E ₂ ,
D ₂ is obtained by the following equation.

[0078]

(Equation 7) Also, coordinates A ₂ , B ₂ , E ₂ ,
The following detailed formula for D _2.

[0079]

(Equation 8) In addition, the coordinates A _n , B _n , E _n ,
D _n is obtained by the following equation.

[0080]

(Equation 9) In addition, the coordinates A _n , B _n , E _n ,
The following detailed calculation formula D _n.

[0081]

(Equation 10) In the lead wiring formed as described above, the area use efficiency (wiring efficiency) of the lead wiring can be improved, and the length of the lead wiring can be shortened. 30-40%
Can be reduced. Further, the reduced amount can be provided as a margin of the on-resistance of the driving semiconductor IC chip, so that the size of the semiconductor IC chip can be reduced. Further, since the length of the lead wiring can be made shorter than before, the size of the liquid crystal display element can be made smaller. As a result, manufacturing costs can be reduced. Furthermore, since the wiring resistance is reduced, distortion of waveforms for driving liquid crystal and distortion of crosstalk can be reduced, so that shadowing (luminance unevenness) can be reduced and display quality can be improved.

Embodiment 2 FIG. 4 is a plan view of a main part of a lead wiring portion of an electrode substrate according to Embodiment 2 of the present invention. FIG. 7B is a plan view showing a range about four times that of FIG.

In the present embodiment, in addition to the configuration of the first embodiment, a plurality of TCPs (see reference numeral 10 in FIGS. 10 and 11) which are arranged in a row on the end of the electrode substrate 12 are used. A dummy electrode 4 is provided in a space between the terminal groups 3 corresponding to the connection terminal groups 3 (see reference numeral 30 in FIG. 7B).
The dummy electrode 4 has a shape as shown to fill the space, that is, a parallel electrode 4a having the same pitch as the terminals 3 and an equal width, and a diagonal straight electrode 4b. The oblique linear electrodes 4b are provided between the oblique linear wires 1 of the outermost adjacent terminals 3 of the terminal 3 group at the same angle and at the same pitch as the oblique linear wires 1. In this embodiment, the dummy electrode 4 is made of an ITO film.
It is electrically floating.

Conventionally, since a plurality of TCPs and a group of terminals 3 connected to the plurality of TCPs have a large space, for example, 0.1 mm.
Due to the thickness of the terminal 3 made of an ITO film as thick as 2 to 0.3 μm, there is a difference in height between a portion where the terminal 3 is present and a portion where the terminal 3 is not present. This shape is transferred to a rubbing roller that performs an alignment process (rubbing) on the alignment film, and when the alignment process is performed using the rubbing roller, uneven rubbing stripes are generated in the alignment film, and the display quality is degraded. However, in this embodiment, the space between the TCPs (between the three terminals) is filled with the dummy electrodes 4 so that the space can be made to have the same concavo-convex condition as both sides thereof, that is, the rubbing condition. As described above, the rubbing stripe unevenness does not occur in the alignment film, and the display quality can be improved. Further, by providing the dummy electrode 4 in the space between the TCPs, the TCP
Since a recess of about 0.2 μm between the two substrates can be eliminated, the gap between the upper and lower substrates can be made uniform. Therefore, it is possible to realize a uniform non-lighting area of black without uneven shading in the frame portion, and it is possible to control the gap between the two substrates satisfactorily. Since the display quality can be prevented, display quality can be improved.

Third Embodiment FIG. 5 is a plan view of a main part of a lead wiring portion of an electrode substrate according to a third embodiment of the present invention. FIG. 7C is a plan view showing a range about four times that of FIG.

In this embodiment, in addition to the structures of the first and second embodiments, as shown in FIG. 5, the upper and lower electrode substrates are provided inside the sealing material 52 of the completed liquid crystal display element (the side where the liquid crystal is interposed). A dummy electrode 5 is provided in a space between terminals 3 in a so-called frame portion which is a non-lighting portion outside a display portion (lighting portion) where each electrode intersects. In addition,
The pitch of the dummy electrodes 5 is equal, and the distance between the dummy electrodes 5 and the terminals 3 on both sides thereof (the length of the interval between them) is equal. In the present embodiment, the distance between the adjacent oblique straight wirings 1 is equal. . In this embodiment, the dummy electrode 5 is made of an ITO film and is electrically floating.

In this embodiment, since the dummy electrode 5 is provided between the terminals 3 of the portion including the frame portion, light leakage can be prevented from occurring from the gap between the terminals 3 of the frame portion. . In addition, the in-plane density of the terminal 3 and a portion where the terminal 3 is extended as it is becomes uniform, and the gap between the upper and lower substrates can be made uniform. Conventionally, as shown in FIG. 16, since the oblique linear wiring 1 of the lead wiring is radial, the interval between the oblique linear wiring 1 is changed from the display electrode 2 to the terminal 3.
However, as a result, there is a problem that uneven shades are formed in the frame portion where the black portion should be originally uniform. Since the electrodes 4 and 5 are provided, the gap in the frame can be made uniform, and this problem is solved.
The frame can be made uniform black, and the display quality can be improved. Further, in the conventional liquid crystal display element, since the display electrode 2 and the oblique straight line 1 made of an ITO film having a thickness of 0.2 to 0.3 μm on the upper and lower electrode substrates support the spacer, the spacer where no electrode is provided becomes free. In addition, the gap control is not effective, and the conventional radial oblique straight wiring 1 has a problem that the wiring density is not uniform as described above, so that color unevenness occurs due to a gap variation in a frame portion. In particular, in an STN-LCD that requires a high-precision gap (± 0.1 μm) between the two electrode substrates, the effective density of the existence of a spacer for providing the gap has a great effect. In the present embodiment, since the dummy electrodes 4 and 5 are provided, the gap in the frame can be made uniform, so that this problem can be solved. Can be improved.

In this embodiment, the dummy electrode 5 is electrically floating. However, as shown in FIG. 6, for example, as shown in FIG. One point connection may be made by 5 '.

Embodiment 4 FIG. 8 shows a state in which an electrode including a lead-out wiring and a dummy electrode according to Embodiment 3 of the present invention is applied to an upper electrode substrate and a lower electrode substrate, and after assembling both substrates. FIG. 11 is a schematic plan view showing an upper electrode and a lower electrode provided with an electrode pattern obtained by duplicating the third embodiment so that dummy electrodes having the same shape face each other.

As described above, of the two electrode substrates 11, 12, the terminals formed at the ends of one of the electrode substrates 11, 12, the lead-out wiring, and the dummy electrode are connected to the other electrode substrate 12, 12.
11, the two electrode substrates 1
Since the gap between 1 and 12 can be made uniform,
The frame portion can be made uniform black, and color unevenness due to the gap variation of the frame portion does not occur, so that the display quality can be improved.

FIGS. 9A to 9C are a plan view of a main part of a liquid crystal display device to which the present invention can be applied and a corresponding cross-sectional view of the main part.

Reference numeral 15 denotes an upper polarizer, 73 denotes a phase plate, 11 denotes an upper electrode substrate, 31 denotes an upper electrode, 74 denotes an insulating film, 21 denotes an upper alignment film, 50 denotes a liquid crystal layer, 75 denotes a spacer, and 22 denotes a lower alignment. Reference numeral 32 denotes a lower electrode, 76 denotes a flattening film, 33 denotes a color filter, 33D denotes a black matrix, 12 denotes a lower electrode substrate, and 16 denotes a lower polarizing plate.

FIG. 10 is a plan view showing a connection state between a printed circuit board, a TCP on which a driving LSI chip is mounted, and a liquid crystal display element in a liquid crystal display device to which the present invention can be applied.

Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the scope of the invention. . For example, in the above-described embodiment, an example in which the present invention is applied to a simple matrix type liquid crystal display device is described. However, the present invention is not limited to this. For example, the present invention can be applied to an active matrix type liquid crystal display device using a thin film transistor or the like as a switching element. Needless to say, there is.
When applied to an active matrix type liquid crystal display element, the display electrode shown in FIG. 1 is connected to a scanning signal line (that is, a gate signal line or a horizontal signal line) or a video signal line ( That is, the drain signal line or the vertical signal line).

[0095]

As described above, according to the present invention,
It is possible to provide a liquid crystal display device having a short and low-resistance lead-out line, which has a high area-use efficiency of the lead-out line. Further, rubbing stripe unevenness does not occur in the display portion, there is no uneven shading unevenness in the frame portion, there is a uniform black non-lighting area, and the gap between both substrates can be well controlled, A liquid crystal display device without color unevenness can be provided.

[Brief description of the drawings]

FIG. 1 is a partial plan view of an electrode substrate showing a lead wiring of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a detailed explanatory diagram for calculating coordinates of first and second lead wirings according to the first embodiment of the present invention.

FIG. 3 is a detailed explanatory diagram for calculating the coordinates of the (n−1) -th and n-th lead wires according to the first embodiment of the present invention.

FIG. 4 is a partial plan view of an electrode substrate provided with a dummy electrode in a gap between terminal groups according to a second embodiment of the liquid crystal display device of the present invention.

FIG. 5 is a partial plan view of an electrode substrate in which a dummy electrode is further provided in a gap between terminals according to a third embodiment of the liquid crystal display device of the present invention.

FIG. 6 is a partial plan view of FIG. 5 showing an embodiment in which a dummy electrode and a lead wiring are electrically connected.

FIGS. 7A to 7C show Examples 1 to 3, respectively.
FIG. 4 is a partial plan view of an electrode substrate showing a lead wiring portion of a wide range about four times as large as that of FIG.

FIG. 8 is a diagram showing an example in which an electrode including a lead-out wiring and a dummy electrode according to the third embodiment of the present invention is applied to an upper electrode substrate and a lower electrode substrate, and the two substrates are assembled by being overlapped; FIG. 11 is a schematic plan view showing an upper electrode and a lower electrode provided with an electrode pattern that duplicates Example 3 so that the dummy electrodes face each other.

FIGS. 9A to 9C are a main part plan view of a liquid crystal display element to which the present invention can be applied and a corresponding main part sectional view.

FIG. 10 shows a liquid crystal display device to which the present invention can be applied, a printed circuit board, a TCP on which a driving LSI chip is mounted, and
It is a top view which shows the connection state with a liquid crystal display element.

FIG. 11 is an exploded perspective view of an example of a liquid crystal display module to which the present invention can be applied.

12 is a block diagram of an example of a laptop personal computer equipped with the liquid crystal display module of FIG. 11 as a display unit.

FIG. 13 is a perspective view of an example of the laptop personal computer of FIG.

FIG. 14 is an exploded perspective view of a main part of an example of a liquid crystal display element.

FIG. 15 is a partially cutaway perspective view of an example of an upper electrode substrate portion of a liquid crystal display element.

FIG. 16 is a partial plan view showing a lead wiring of a conventional liquid crystal display device.

[Explanation of symbols]

1 ₁ to 1 8 _... oblique straight _{line, 2} 1 to 2 8 _... display electrode,
3 ₁ to 3 8 _... terminal, 12 ... electrode substrate, 52 ... sealing material,
71: alignment mark of TCP, 72: one TCP
Center line of terminal group corresponding to.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Mitsugu Katayama 3300 Hayano, Mobara-shi, Chiba Electronic Device Division, Hitachi, Ltd. (72) Inventor Tomohide Ohira 3300 Hayano, Mobara-shi, Chiba Electronic Device Business, Hitachi, Ltd. (72) Inventor Tatsunori Bunkura 3681 Hayano, Mobara City, Chiba Prefecture Inside Hitachi Device Engineering Co., Ltd. (72) Inventor Hazumi 3681, Hayano, Mobara City, Chiba Prefecture F-term in Hitachi Device Engineering Co., Ltd. (Reference) 2H092 GA33 NA01 NA11 PA03 PA06 5C094 AA03 AA15 BA43 CA19 CA24 DB03 DB04 EA04 EA07 EB02 ED03 ED14

Claims (8)

[Claims] 1. A plurality of electrodes wired in parallel on a substrate sandwiching a liquid crystal layer, terminals extending to ends of the substrate and connected to a driving element, and the electrodes, In a liquid crystal display device having lead wires connecting the respective terminals, the pitch of the electrodes and the pitch of the terminals are different, and the lead wires electrically connect the electrodes and the terminals. A liquid crystal display device having non-parallel straight lines, wherein the straight lines are substantially parallel to each other. 2. A plurality of scanning signal lines, a switching element, and a switching element, each of which is wired in parallel to one of the substrates sandwiching the liquid crystal layer, are drawn out to an end of the substrate, and are connected to a driving element. In a liquid crystal display device having a terminal and a lead-out line connecting each of the scanning signal lines and the terminals, a pitch of the scanning signal line and a pitch of the terminal are different, and the lead-out line is connected to the scanning signal line. A liquid crystal display device having a straight line that is electrically connected to the terminal and is non-parallel to the scanning signal line, wherein the straight lines are substantially parallel to each other. 3. A plurality of video signal lines respectively wired in parallel to one of the substrates sandwiching the liquid crystal layer, a switching element, and a lead extending to an end of the substrate and connected to a driving element. In a liquid crystal display device having a terminal and a lead wire for connecting each of the video signal lines and each of the terminals, a pitch of the video signal line and a pitch of the terminal are different, and the lead wire is connected to the video signal line. A liquid crystal display device, comprising: straight lines that are electrically connected to the terminals and that are non-parallel to the video signal lines, wherein the straight lines are substantially parallel to each other. 4. A plurality of electrodes wired in parallel to each other on a substrate sandwiching a liquid crystal layer, terminals extending to ends of the substrate and connected to driving elements, and the electrodes, In a liquid crystal display device having a lead wire for connecting each terminal, the pitch of the electrodes and the pitch of the terminals are different, and the lead wire connected to at least a terminal in an outer part of a terminal group is a part of the electrode. A liquid crystal display device comprising: a straight line that is electrically non-parallel to the electrode, and electrically connects the terminal and the terminal, and the straight lines are substantially parallel to each other. 5. A plurality of scanning signal lines wired in parallel to one of the substrates sandwiching the liquid crystal layer, a switching element, and a lead extending to an end of the substrate, and connected to a driving element. In a liquid crystal display device having a terminal and a lead-out line connecting each of the scanning signal lines and each of the terminals, a pitch of the scanning signal line and a pitch of the terminal are different, and a terminal of at least an outer portion of a terminal group is provided. The lead wiring connected to the terminal has a straight line that is electrically non-parallel to the scanning signal line and electrically connects the scanning signal line and the terminal, and the straight lines are substantially parallel to each other. Liquid crystal display device. 6. A plurality of video signal lines respectively wired in parallel to one of the substrates sandwiching the liquid crystal layer, a switching element, and a lead extending to an end of the substrate and connected to a driving element. In a liquid crystal display device having a terminal and a lead-out line connecting each of the video signal lines and each of the terminals, a pitch of the video signal line and a pitch of the terminal are different, and a terminal of at least an outer portion of a terminal group is provided. The lead wiring connected to the terminal has a straight line that is electrically non-parallel to the video signal line and electrically connects the video signal line and the terminal, and the straight lines are substantially parallel to each other. Liquid crystal display device. 7. The liquid crystal display device according to claim 1, wherein the lengths of the intervals between the adjacent straight lines are substantially equal. 8. The lead wire according to claim 1, wherein the lead wire has a portion parallel to the terminal, and the length of the lead wire portion parallel to the terminal is changed. A liquid crystal display device according to any one of the above.