JPH05281567A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To obtain equal contrast in the vertical or lateral direction of an image plane so as to heighten display quality remarkably. CONSTITUTION:One transparent base 2 with plural scanning electrodes disposed, and the other transparent base 3 with plural signal electrodes disposed are disposed opposedly so that each scanning electrode row and each signal electrode row are orthogonal. A liquid crystal is filled between one transparent base 2 and the other transparent base 3 so as to form a display area, and the part of each scanning electrode intersecting each signal electrode is made into each dot. A liquid crystal display element of such constitution is further provided with a scanning electrode voltage supply part 10 for supplying applied voltage to plural scanning electrodes, and a signal electrode voltage supply part 12 for supplying applied voltage to plural signal electrodes. The sum of the wiring resistance of a path reaching the scanning electrode voltage supply part 10 from the scanning electrode part positioned at the dot and the wiring resistance of a path reaching the signal electrode voltage supply part from the signal electrode part positioned at the dot is made substantially equal on each dot.

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 having improved display quality.

[0002]

2 and 3 show a conventional liquid crystal display device 1, FIG. 2 is a plan view, and FIG. 3 is a section line XX of FIG.
It is the sectional view seen from.

In these figures, 2 is a transparent substrate for scanning electrodes, 3 is a transparent substrate for signal electrodes, 4 is a scanning electrode formed by arranging a plurality of transparent electrode lines on the transparent substrate 2 for scanning electrodes, 5 Is a signal electrode formed by arranging a plurality of transparent electrode lines on the signal electrode transparent substrate 3, and the alignment films 6 and 7 are coated on the scanning electrode 4 and the signal electrode 5, respectively. It The liquid crystal 8 is interposed between the substrates 2 and 3 corresponding to the display area, and the liquid crystal 8 is enclosed by surrounding the display area with a seal portion 9.

Further, the scan electrode 4 is electrically connected to the scan electrode voltage supply unit 10 for applying a voltage thereto via the scan electrode distribution line 11, while the signal electrode 5 applies a voltage thereto. Are electrically connected to the signal electrode voltage supply section 12 via the signal electrode distribution line 13.

When the liquid crystal display element 1 having such a structure is operated, display dots are formed at the intersections of the scanning electrodes 4 and the signal electrodes 5, and the dots are arranged in a matrix. Then, each dot is turned on by applying a voltage to the corresponding scanning electrode 4 and signal electrode 5, and is turned off when both are not applied.

[0006]

However, in the case of the liquid crystal display element 1 having the above structure, the lengths of the scanning electrode distribution lines 11 are different from one scanning electrode voltage supply section 10, and scanning is performed. The distance increases as the distance from the electrode voltage supply unit 10 increases, and the distance for the other signal electrode distribution line 13 also increases as the distance from the signal electrode voltage supply unit 12 increases. In this case, the sum of the distances between the scanning electrode voltage supply unit 10 and the signal electrode voltage supply unit 12, that is, the sum of the resistance values between them, is different for each dot, and there is a difference in the voltage applied to each dot. As a result, there is a problem in that there is a difference in contrast in the vertical direction or the horizontal direction of the screen.

[0007]

In a liquid crystal display device of the present invention, one transparent substrate on which a plurality of scanning electrodes are arranged and the other transparent substrate on which a plurality of signal electrodes are arranged are each scanned. The electrode array and each signal electrode array are arranged so as to be orthogonal to each other, and liquid crystal is sealed between one transparent substrate and the other transparent substrate to form a display region, and each display region is formed within the display region. The dot where the scanning electrode and each signal electrode intersect is formed as each dot, and the scanning electrode voltage supply unit that supplies the applied voltage to the plurality of scanning electrodes and the signal electrode that supplies the applied voltage to the plurality of signal electrodes And a configuration for providing a voltage supply section for
The sum of the wiring resistance of the path from the part of the scanning electrode located in the dot to the voltage supply part for the scanning electrode and the wiring resistance of the path from the part of the signal electrode located in the dot to the voltage supply part for the signal electrode It is characterized in that each dot is made substantially equal.

[0008]

According to the liquid crystal display element of the present invention, the wiring resistance of the path from the part of the scan electrode located at a certain dot to the voltage supply part for the scan electrode and the part of the signal electrode located at that dot for the signal electrode By making the sum of the wiring resistance of the path to the voltage supply section substantially equal over each dot, the sum of the wiring resistance of both the scan electrode voltage supply section and the signal electrode voltage supply section in the ON state is The dots are equal, and there is no difference in the voltage applied to each dot, and as a result, the contrast is equal in the vertical direction or the horizontal direction of the screen.

[0009]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 shows an STN type liquid crystal display element 14 of the present invention.
4 is a plan view of the same, and the same portions as those shown in FIGS. 2 and 3 of the conventional liquid crystal display element 1 are designated by the same reference numerals.

In the figure, 2 is a transparent substrate for scanning electrodes,
Reference numeral 3 is a transparent substrate for signal electrodes, 4 is a scanning electrode formed by arranging a plurality of transparent electrode lines made of, for example, indium tin oxide on the transparent substrate for scanning electrode 2, and 5 is a transparent substrate for signal electrode 3. The signal electrodes are formed by arranging a plurality of transparent electrode lines on the scanning electrodes 4 and the signal electrodes 5.
Alignment films 6 and 7 made of, for example, a polyimide resin are coated on the respective layers. The liquid crystal 8 is interposed between the substrates 2 and 3 corresponding to the display area, and the liquid crystal 8 is enclosed by surrounding the display area with a seal portion 9.

Further, the scan electrode 4 is a voltage supply unit 1 for the scan electrode.
The voltage is applied at 0, and the scan electrode 4 and the scan electrode voltage supply unit 10 are electrically connected by the scan electrode distribution line 15 formed in the non-display area of the scan electrode transparent substrate 2.

A voltage is also applied to the signal electrode 5 by the signal electrode voltage supply section 12, and the signal electrode 5 and the signal electrode voltage supply section 12 are formed on the non-display area of the signal electrode transparent substrate 3. It is electrically connected by the distribution line 16 for.

The STN type liquid crystal display element 1 having such a structure
4, the dots where the scanning electrodes 4 and the signal electrodes 5 intersect form display dots, and the dots are arranged in a matrix. Then, each dot is turned on by applying a voltage to the corresponding scanning electrode 4 and signal electrode 5, and is turned off when both are not applied.

In this embodiment, the wiring resistance of the path from the portion of the scan electrode 4 located at a certain dot to the scan electrode voltage supply section 10 and the signal electrode 5 located at that dot.
Resistance of each of the scanning electrode power distribution line 15 and the signal electrode power distribution line 16 so that the sum of the wiring resistance of the path from the part of FIG. Change the value.

The change in the resistance value may be set as follows.

The resistance value of each scan electrode 4 is R ₀ , the resistance value of each signal electrode 5 is r _0, and each scan electrode distribution line 15
As shown in FIG. 1, the resistance values of R ₁ , R ₂ , R ₃ ...
.. where R _n-1, R _n , R _K −R _{K + 1} = r ₀ / (n−
1), so that R ₁ −
R _n = r ₀ .

Further, as shown in FIG. 1, the resistance values of the respective signal electrode distribution lines 16 are sequentially r ₁ , r ₂ , r ₃ ... R _m-1,
If r _m , then r _K −r _{K + 1} = R ₀ / (m−1) may be set, whereby r ₁ −r _m = R ₀
Becomes

In order to change the resistance value of each of the scanning electrode power distribution line 15 and the signal electrode power distribution line 16 as described above, a part of the power distribution lines 15 and 16 may be resistive as shown in FIG. The body 17 is provided, and each resistance value of the resistance body 17 is changed to obtain a required resistance value. In FIG. 4, when the resistor 17 is made of an alloy of nichrome, constantan, manganese, or the like or carbon, they are formed by printing, and the required resistance value is obtained by changing the printing area.

The present invention is not limited to the above embodiments, and various changes and improvements may be made without departing from the scope of the present invention. For example, as shown in FIG. 5, the length of a part of each distribution line of the scanning electrode distribution line 15 and the signal electrode distribution line 16 may be changed so as to obtain a required resistance value. In this figure, the area B in the distribution lines 15 and 16 is at a constant interval, but the area A is in each distribution line 1
It changes every 5 and 16. Alternatively, in addition to these FIG. 4 and FIG. 5, the width of each distribution line of the scanning electrode distribution line 15 and the signal electrode distribution line 16 may be changed, or the length and width may be further changed.

[0021]

As described above, in the liquid crystal display device of the present invention, the wiring resistance of the path from the portion of the scan electrode located in each dot to the scan electrode voltage supply section and the signal located in each dot. By substantially equalizing the sums of the wiring resistances of the paths from the electrode parts to the signal electrode voltage supply section, the scanning electrode voltage supply section and the signal electrode voltage supply section both reach the scanning electrode voltage supply section in the ON state. The sum of the wiring resistance becomes equal for each dot, so that there is no difference in the voltage applied to each dot, and as a result, there is no difference in the contrast for each dot, and moreover, in the vertical or horizontal direction of the screen. The contrast became equal and the display quality could be remarkably improved.

[Brief description of drawings]

FIG. 1 is a plan view of a liquid crystal display element of an example.

FIG. 2 is a plan view of a conventional liquid crystal display element.

3 is a cross-sectional view of the liquid crystal display element of FIG.

FIG. 4 is an explanatory diagram showing a distribution line for a scanning electrode or a signal electrode in the liquid crystal display element of the example.

FIG. 5 is an explanatory view showing a distribution line for a scanning electrode or a signal electrode.

[Explanation of symbols]

 2 ... Scan electrode transparent substrate 3 ... Signal electrode transparent substrate 4 ... Scan electrode 5 ... Signal electrode 6, 7-Alignment film 10 ... Scan electrode voltage supply unit 12 ... Signal electrode Voltage supply unit 15 ... Scanning electrode distribution line 16 ... Signal electrode distribution line

Claims (1)

[Claims] 1. A transparent substrate on which a plurality of scanning electrodes are arranged and another transparent substrate on which a plurality of signal electrodes are arranged so that each scanning electrode array and each signal electrode array are orthogonal to each other. Liquid crystal is sealed between one transparent substrate and the other transparent substrate so as to form a display region, and the portions where the scanning electrodes and the signal electrodes intersect each other in the display region are arranged facing each other. In a liquid crystal display element, which is not a dot, further includes a scanning electrode voltage supply section for supplying an applied voltage to a plurality of scanning electrodes, and a signal electrode voltage supply section for supplying an applied voltage to a plurality of signal electrodes, The sum of the wiring resistance of the path from the part of the scanning electrode located in the dot to the voltage supply part for the scanning electrode and the wiring resistance of the path from the part of the signal electrode located in the dot to the voltage supply part for the signal electrode Virtually equal across each dot The liquid crystal display element characterized and.