JPH0667191A - Liquid crystal display unit - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display unit capable of performing uniform display as a whole by making the display density of a picture element constant regardless of the length of a distance from a terminal part. CONSTITUTION:Two glass substrates 1 and 2 are provided to be opposed to each other and in parallel, and 1st and 2nd electrode patterns 3 and 4 are formed on the opposed surfaces of the substrates 1 and 2. The terminal parts for inputted a driving signal 51, 52,...5n and 61, 62,... 6m are formed along the side of the substrates 1 and 2 on the 1st and the 2nd patterns 3 and 4. Wiring electrodes 71, 72,... 7n and 81, 82,... 8m are respectively connected between the terminal parts 51, 52,... 5n and 61, 62,... 6m and display electrodes 91, 92,... 9n and 101, 102,... 10m. The wiring electrodes 71, 72,... 7n and 81, 82,... 8m are formed to be divided into linear wiring electrode parts 151, 152,... 15n and 171, 172,... 17m to oblique wiring electrode parts 161, 162,... 16n and 181, 182,... 18m.

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 in which a liquid crystal is sandwiched between display electrodes formed between two substrates.

[0002]

2. Description of the Related Art Conventionally, as this type of liquid crystal display, for example, one having a structure shown in FIG. 3 is known.

In the structure shown in FIG. 3, two glass substrates 1 and 2 are provided so as to face each other substantially in parallel, and the opposing surfaces of the glass substrates 1 and 2 are provided with first and second electrode patterns. 3 and 4 are formed. These first and second electrode patterns 3 and 4 are provided with drive signal input terminal portions 5 and 6 which are provided in parallel along one side of the glass substrates 1 and 2 with the longitudinal direction being perpendicular to the periphery. Wiring electrodes 7 and 8 are formed in an oblique direction from these terminal portions 5 and 6, respectively, and a plurality of strip-shaped display electrodes 9 and 10 are parallel to the tip ends of these wiring electrodes 7 and 8, respectively. The display electrodes 9 and 10 are formed so as to be orthogonal to each other.

A liquid crystal (not shown) is sandwiched between the glass substrates 1 and 2, and a display pixel 11 is provided between the display electrodes 9 and 10.
Are formed.

[0005]

However, since the pitches of the terminal portions 5 and 6 and the display electrodes 9 and 10 are different, the lengths of the wiring electrodes 7 and 8 are different from each other, depending on the length of the wiring electrodes 7 and 8. , The resistance value between the terminal portions 5 and 6 and the display electrodes 9 and 10 is different, and the voltage drop amount of the drive signal input from the terminal portions 5 and 6 is different. Therefore, the display pixel 11 near the terminals 5 and 6 has a high display density, and the display pixel 11 far from the terminals 5 and 6 has a low display density.
The brightness is different for each, and there is a problem that a uniform display cannot be performed as a whole.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display capable of performing uniform display as a whole.

[0007]

A liquid crystal display device according to claim 1, wherein a terminal portion formed at one end, a display electrode formed at the other end, and the terminal between the terminal portion and the display electrode portion. First and second electrode patterns each having a wiring electrode provided in an oblique direction with respect to the portion, and first and second substrates formed on the surfaces where the first and second electrode patterns face each other. And these first and second
A liquid crystal display having a liquid crystal sandwiched in a gap between the substrates and having display pixels formed between the display electrodes.
Further, at least one of the wiring electrodes of the second electrode pattern is divided into a plurality of wiring electrode portions having different resistance values per unit length, and the lengths of the respective wiring electrode portions are made different from each other. Each wiring resistance value between the terminal portion of the first electrode pattern and the terminal portion of the second electrode pattern is set to a constant value.

A liquid crystal display device according to a second aspect is the liquid crystal display device according to the first aspect, wherein the wiring electrode has a linear wiring electrode portion linearly formed in the terminal portion, and the wiring electrode with respect to the linear wiring electrode portion. It is composed of a diagonal wiring electrode portion formed diagonally.

[0009]

The liquid crystal display according to claim 1 has the first and second liquid crystal displays.
Among the electrode patterns, at least one of the wiring electrodes is divided to provide a plurality of wiring electrode portions, and the wiring resistance values between the terminal portions of the first electrode pattern and the terminal portions of the second electrode pattern are constant. Since the voltage drop at each wiring electrode becomes constant because of the value, the display density of the display pixel becomes constant regardless of the distance from the terminal portion, and it is possible to display a uniform density as a whole. it can.

A liquid crystal display according to a second aspect is the liquid crystal display according to the first aspect, in which a linear wiring electrode portion linearly formed in the terminal portion and an inclination with respect to the linear wiring electrode portion are formed. By forming the wiring electrode from the diagonal wiring electrode portion, the design value can be widened and the resistance value can be reliably made constant.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the liquid crystal display of the present invention will be described below with reference to the drawings. The parts corresponding to those of the conventional example shown in FIG.

As shown in FIG. 1, two first and second glass substrates 1 and 2 having different shapes are provided so as to face each other substantially in parallel. Then, the glass substrate 2 of the glass substrate 1
The first electrode pattern 3 made of ITO (indium oxide) or the like is formed on the surface facing the substrate 1. Similarly, the second electrode pattern 4 made of ITO or the like is formed on the surface of the glass substrate 2 facing the glass substrate 1. Has been formed.

Further, the first electrode pattern 3 has a plurality of terminal portions 5 ₁ for driving signal input, which are parallel to each other in a longitudinal direction at right angles to the periphery along one side of the glass substrate 1 in a portion not facing the glass substrate 2. 5 ₂ , ..., 5 _n are formed, and these terminal portions 5 are formed.
_1, 5 _2, ..., the 5 _n, the wiring electrodes 7 _1, 7 _2, ..., 7
_n it is connected, the wiring electrodes 7 _1, 7 _2, ..., the 7 _n, a plurality of strip-shaped display electrodes 9 _1, 9 _2, ..., 9 _n are formed in parallel to each. Then, the wiring electrodes 7 ₁ , 7
₂ , ..., 7 _n are linear wiring electrode portions 15 ₁ , 15 ₂ , ..., 15 formed substantially linearly from the terminal portions 5 ₁ , 5 ₂ , ..., 5 _n.
and _n, the linear wiring electrode portions 15 _1, 15 _2, ..., 15 _n and the display electrodes 9 _1, 9 _2, ..., 9 straight wiring electrode portion 15 ₁ for connecting the _n, 15 _2, ..., to 15 _n On the other hand, it is formed by being divided into diagonal wiring electrode portions 16 ₁ , 16 ₂ , ..., 16 _n which are arranged diagonally. In addition, the straight line wiring electrode parts 15 ₁ , 15 ₂ ,
, 15 _n and the diagonal wiring electrode portions 16 ₁ , 16 ₂ , ..., 16 _n have different line widths, and therefore have different resistance values per unit length.

On the other hand, the second electrode pattern 4 is provided in a portion not facing the glass substrate 1 in parallel with one side of the glass substrate 2 in a longitudinal direction at right angles to the periphery in parallel with terminal portions 6 ₁ for inputting drive signals. 6 ₂ , ..., 6 _m are formed, and these terminal portions 6 are formed.
_1, 6 _2, ..., the 6 _m, the wiring electrodes 8 _1, 8 _2, ..., 8
_m is connected, the wiring electrodes _81, 82, ..., the 8 _m, the display electrodes 10 of _a plurality of strip-shaped, 10 _2, ..., 10 _m display electrodes 9 _1, 9 _2, ..., 9 _n Orthogonal to, and
Each is formed in parallel. Then, wiring electrodes _{8 1, 8 2, ...,} 8 m , the terminal portions _{6 1, 6 2, ...,} 6 m
Straight wiring electrode part 17 ₁ , 1
7 ₂ , ..., 17 _m and this straight line wiring electrode part 17 ₁ , 17 ₂ ,
, 17 _m and display electrodes 10 ₁ , 10 ₂ , ..., 10 _m, and straight wiring electrode parts 17 ₁ , 17 ₂ , ..., 17 _m diagonal wiring electrode parts arranged obliquely with respect to 17 _{m 1} , 18 ₂ ,…, 18 _m
It is formed by being divided into and. Also, the straight wiring electrode section
17 ₁ , 17 ₂ , ..., 17 _m and diagonal wiring electrode part 18 ₁ , 18 ₂ ,
The line width is different from 18 _m , so the resistance value per unit length is different.

A liquid crystal (not shown) is sandwiched between the glass substrates 1 and 2, and display electrodes 9 ₁ , 9 ₂ , ..., 9 _n , 10 are provided.
Display pixels 11 ₁₁ , 11 ₁₂ , ..., Between 10 _m , ₁ , 10 ₂ ,.
11 _nm is formed.

Then, when designing the first electrode pattern 3, for example, the display pixel 11 ₁₁ close to the second electrode pattern 4 is formed.
To make the load resistance of the display pixel 11 _n1 far from the load resistance of the same, first, the straight line wiring electrode portion 15 ₁ and the diagonal wiring electrode portion
Wire with the minimum line width according to the design rule so that the resistance with 16 ₁ is maximized. In this state, the linear wiring electrode portions 17 ₁ , 17 ₂ , ..., 17 _m and the diagonal wiring electrode portion 1 are arranged so that the resistance value of the display pixel 11 _{11 and} the resistance value of the display pixel 11 ₁₂ ... 11 _nm are the same.
Line widths of 8 ₁ , 18 ₂ , ..., 18 _m are determined respectively.
With this wiring method, each display pixel 11 ₁₁ , 11 ₁₂ , ...,
The load resistance applied to 11 _nm becomes constant, the amount of voltage drop becomes constant, and the display density of each display pixel 11 ₁₁ , 11 ₁₂ , ..., 11 _nm becomes uniform.

The second electrode pattern 4 may also be designed similarly.

On the other hand, the first and second electrode patterns 3,
To correct the resistance of _No. 4, the wiring electrodes 7 ₁ , 7 ₂ , ..., 7
_Since the length and line width of _n , 8 ₁ , 8 ₂ , ..., 8 _m are changed, the wiring electrodes 7 ₁ , 7 ₂ , ..., 7 _n , 8 ₁ can be corrected depending on the shape, size, etc. of the manufactured liquid crystal display. , 8 ₂ , ...,
Although the number of 8 _m may be limited, each wiring electrode 7 ₁ ,
_{7 2, ..., 7 n,} 8 1, 8 2, ..., straight wire electrodes 15 ₁ to _{8 m, 15 2, ...,} 15 n, 17 1, 17 2, ..., 17 m and the oblique wiring electrode portion 16 ₁ , 16 ₂ , ..., 16 _n , 18 ₁ , 18 ₂ , ..., 18
By splitting into _m and _m , the terminal parts 5 ₁ , 5 ₂ , ..., 5
_n , 6 ₁ , 6 ₂ , ..., 6 _m and display electrodes 9 ₁ , 9 ₂ ,.
The maximum line width can be made wider and the resistance value that can be corrected becomes larger than that when 9 _n , 10 ₁ , 10 ₂ , ..., 10 _m are wired in a straight line.

The linear wiring electrode portions 15 ₁ , 15 ₂ , ..., 15
The length of _n , 17 ₁ , 17 ₂ , ..., 17 _m is the longest at half of the number of display electrodes 9 ₁ , 9 ₂ , ..., 9 _n , 10 ₁ , 10 ₂ , ..., 10 _m to be connected. The display electrodes 9 ₁ and 10 ₁ are preferably made longer than the display electrodes 9 ₁ and 10 _{1 at} regular intervals.

As described above, each wiring electrode 7 ₁ , 7 ₂ ,
_{..., 7 n, 8 1,} 8 2, ..., straight wiring electrode part 1 to 8 _m
5 ₁ , 15 ₂ , ..., 15 _n , 17 ₁ , 17 ₂ , ..., 17 _m and diagonal wiring electrode parts 16 ₁ , 16 ₂ , ..., 16 _n , 18 ₁ , 18 ₂ , ..., 18 _m
By dividing into and, the resistance value that can be corrected becomes wider and the load resistance value can be made uniform. Display pixels 11 ₁₁ , 11 ₁₂ ,
…, 11 _nm number increases. In this case, the corrected wiring electrode is not always the power supply side terminal portion 5 ₁ , 5 ₂ , ..., 5 _n , 6
_It does not always become thicker from ₁ , 6 ₂ , ..., 6 _m .

Next, another embodiment will be described with reference to FIG.

The embodiment shown in FIG. 2 shows the first electrode pattern 3 of the glass substrate 1 shown in FIG. 1, for example.

The lengths of the linear wiring electrode portions 15 ₁ , 15 ₂ , ..., 15 _n change stepwise, and these linear wiring electrode portions 15 ₁ , 1
Diagonal wiring electrode parts 16 ₁ , 16 ₂ , with 5 ₂ , ..., 15 _n
… The length of 16 _n also changes stepwise. These straight wiring electrode parts 15 ₁ , 15 ₂ , ..., 15 _n and diagonal wiring electrode parts 16
₁ , 16 ₂ , ..., 16 _n are the maximum width W of the diagonal wiring electrode portion 16 ₁ such that the length of the diagonal wiring electrode portion 16 _{1 having} the minimum wiring angle θ is L and the minimum wiring resistance value is R. _The linear wiring electrode portions 15 ₁ , 15 ₂ , ..., 15 _n and the diagonal wiring electrode portions 16 ₁ , 16 ₂ , ..., 16 _n are set to the minimum wiring resistance value R by the setting of _1. , 15 ₂ , and 15 _n and the diagonal wiring electrode portions 16 ₁ , 16 ₂ , ..., 16 _n are corrected for line width. The minimum wiring resistance value R in this case can be calculated as an approximate value by the following calculation.

Resistance coefficient K = (L ÷ W ₁ ) Minimum wiring resistance value R = K × electrode sheet resistance value of the first electrode pattern 3 In addition, straight wiring electrode portions 15 ₁ , 15 ₂ , ..., 15 _n and diagonal In order to correct the resistance values of the wiring electrode portions 16 ₁ , 16 ₂ , ..., 16 _n to the minimum resistance value R, the linear wiring electrode portions 15 ₁ , 15
_2, ..., 15 a length of _n L _1, L _2, ..., L _n and oblique wiring electrode portions 16 _1, 16 _2, ..., a 16 _n length M _1, M _2, ...,
M _n and the respective linear wiring electrode portions 15 ₁ , 15 ₂ ,
, 15 _n line widths W ₁ , W ₂ , ..., W _n and diagonal wiring electrode portions 16 ₁ , 16 ₂ , ..., 16 _n line widths Y ₁ , Y ₂ ,
, Y _n , the resistance coefficient is calculated, and the line width is back-calculated and corrected so that the calculated value becomes the minimum wiring resistance R.

[0025]

According to the liquid crystal display device of the first aspect, at least one wiring electrode of the first and second electrode patterns is divided to provide a plurality of wiring electrode portions.
Since each wiring resistance value between the terminal portion of the first electrode pattern and the terminal portion of the second electrode pattern is set to a constant value, the voltage drop at each wiring electrode becomes constant, so that there is no need to worry about the distance from the terminal portion. The display density of the display pixel becomes constant,
It is possible to display a uniform density as a whole.

According to the liquid crystal display device of the second aspect, in addition to the liquid crystal display device of the first aspect, a linear wiring electrode portion linearly formed in the terminal portion and an oblique line with respect to the linear wiring electrode portion. By forming the wiring electrode from the diagonal wiring electrode portion formed in the above, the width of design can be widened and the resistance value can be reliably made constant.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a liquid crystal display according to an embodiment of the present invention.

FIG. 2 is a plan view showing an electrode pattern of another embodiment of the same as above.

FIG. 3 is an explanatory diagram showing a conventional liquid crystal display.

[Explanation of symbols]

1 1st glass substrate 2 2nd glass substrate 3 1st electrode pattern 4 2nd electrode pattern 5 ₁ , 5 ₂ , ..., 5 _n , 6 ₁ , 6 ₂ , ..., 6 _m terminal part 7 ₁ , 7 ₂ , ..., 7 _n , 8 ₁ , 8 ₂ , ..., 8 _m Wiring electrodes 9 ₁ , 9 ₂ , ..., 9 _n , 10 ₁ , 10 ₂ , ..., 10 _m Display electrodes 11 ₁₁ , 11 ₁₂ , ... , 11 _nm display pixel 15 ₁ , 15 ₂ , ..., 15 _n , 17 ₁ , 17 ₂ , ..., 17 _m Linear wiring electrode section 16 ₁ , 16 ₂ , ..., 16 _n , 18 ₁ , 18 ₂ , ..., 18 _m Diagonal wiring electrode section

Claims (2)

[Claims] 1. A terminal portion formed at one end, a display electrode formed at the other end, and a wiring electrode obliquely provided between the terminal portion and the display electrode portion with respect to the terminal portion. First and second electrode patterns having, and
A display pixel is formed between the first and second substrates formed on the surfaces where the first and second electrode patterns face each other, and the display electrodes sandwiched between the first and second substrates. A liquid crystal display including a liquid crystal, the wiring electrode of at least one of the first and second electrode patterns is divided into a plurality of wiring electrode portions having different resistance values per unit length. A liquid crystal display characterized in that the wiring resistance values between the terminal portions of the first electrode pattern and the terminal portions of the second electrode pattern are made constant by varying the lengths of these wiring electrode portions. vessel. 2. The wiring electrode comprises a linear wiring electrode portion linearly formed in the terminal portion, and an oblique wiring electrode portion diagonally formed with respect to the linear wiring electrode portion. Item 3. The liquid crystal display according to item 1.