JPS6037526A - Method for driving liquid crystal display element - Google Patents

Abstract

PURPOSE:To enlarge a visual angle by dividing scanning electrodes into plural electrode groups and applying different effective voltage on each group. CONSTITUTION:Scanning electrodes 1-5 of a liquid crystal display element provided with said electrodes 1-5 and signal electrodes 6-10 are divided into two groups of electrode 1a-5a, and 1b-5b. When voltages V1a-V5a are applied to the electrodes 1a-5a of the group (a), respctively, voltages V1b-V5b same in phase and different in the absolute value are successively applied to the electrodes 1b-5b of the group (b), respectively. Since each visual angle depends upon each applied voltage value, the visual angle of each image element is enlarged on the whole.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a drive method for a liquid crystal display element, particularly a drive voltage application method in a voltage effect type liquid crystal display element. This figure shows a dot matrix display device comprising 5×5 pixels. In the figure, (1), (2), (3).

(4), (5) are scanning electrodes, (6), (7), (8
), (9), and (10) are signal electrodes, and each intersection of these scanning electrodes (1) to (5) and signal electrodes (6) to (10) constitutes a pixel.

Next, the operation will be explained. In FIG. 1, the graphic pattern is displayed as follows. That is, in FIGS. 2(,) to (e), the horizontal axis shows time t, and the vertical axis shows the rectangular wave voltage v applied to each scanning electrode, and the scanning electrode (1) shown in FIG. The voltage V1 shown in FIG. 2 (,) + the voltage V2 shown in FIG. e)
, (d) and (e) voltage v3 + v4t V5
A rectangular wave pulse of a constant voltage is applied to each of the scanning electrodes (1
) to (5) are applied in order, which is equivalent to applying an AC waveform to one scanning electrode. On the other hand, in the signal electrodes (6) to (10), if the intersection of the scanning electrodes to which the rectangular wave pulse voltage is applied is a display selection pixel, the rectangular wave pulse is of opposite phase, and if it is a non-display pixel, the rectangular wave pulse is of the same phase. The voltages were applied in parallel with the application of square wave pulses to the scanning electrodes.

However, according to the conventional driving method described above, only a fixed effective voltage is not applied to the 15 selected pixels, so there is a drawback that the viewing angle becomes narrow.

[Summary of the invention]

Therefore, this invention was made to eliminate the above-mentioned conventional drawbacks, and its purpose is to:
An object of the present invention is to provide a driving method for a liquid crystal display element in which the viewing angle is expanded by dividing a scanning electrode into two parts and applying rectangular wave pulse voltages having different voltage values to each part.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

[Embodiments of the invention]

FIG. 3 is a plan view of a main part of a liquid crystal display element showing an embodiment of the driving method for a liquid crystal display element according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In the same figure, (1a)
, (2a), (3a), (4a), (5a) and (1
b), (2b), (3b), (4b), and (5b) are scanning electrodes, and these two scanning electrodes (1m) and (1b) are the scanning electrodes (1)e2 shown in Figure 1. It is configured as follows. Furthermore, the scanning electrodes (2a) and (2b) to the scanning electrodes (5m) and (5b) are similarly configured.

In addition, scanning electrodes (1a) to (5a) are grouped into group a.
The scan electrodes (1b) to (5b) constitute the scan electrodes of group b. One pixel is defined as one pixel at two intersections between one scanning electrode and one signal line belonging to group a and group b. That is, as for pixels, two pixels in the conventional method are combined into one pixel in the conventional method.

Next, the operation will be explained.

In FIG. 3, the graphic pattern is displayed as follows. That is, in Figures 4(,) to (j), the horizontal axis shows time t, and the vertical axis shows the rectangular wave pulse voltage (hereinafter referred to as voltage) applied to each scan electrode divided into two. , the scanning electrode (1a) shown in FIG. 3 has a voltage Vla shown in FIG. 4(a), the scanning electrode (1b) has a voltage Vlb shown in FIG. 4(b), and similarly each scanning electrode (2a) .

(2b), (3a), (3b)-(4a), (4b),
(5a), (5b) are shown in Figure 4 (cL(d), (e),
Voltage v shown in (f), (g), (h), (i), (j)
2. .

Vn+b+V3a+Vab+V4a+V4b+Vsa+
V5b''k is applied sequentially to each scan electrode (1a) of group a.

(2a), (3a), (4a)', (5a) are conventional scanning electrodes (1), (2), (3),
(4) Same voltage as (5) V1 , V2 , V3
, V4, and V5 are applied to the signal electrodes (6), (7
), (8), (9), and (10) are applied with the same voltage as in the conventional method. On the other hand, scanning electrode (1b) of group b
, (2b)+(3b), (4b), and (5b) are pairs of scanning electrodes (1m) and (2a) of group a, respectively.

(3m), (4m), (5m) each voltage Vl&+
When V2a+V3a+V41L+VSa is applied, a voltage Vl b +V21) that is in phase with it and has a different absolute value
+V3 b+V4 b+V5 b are respectively applied in sequence.

In the above embodiment, a dot matrix type liquid crystal display element having 5×5 pixels was used, but the number of pixels and therefore the number of scanning electrodes and the number of signal electrodes are not limited to this, and may be any number. . Further, the number of groups of scanning electrodes may be arbitrary, and although the voltage value applied to each group is different, the same voltage value may be applied to a plurality of groups.

〔Effect of the invention〕

As explained above, according to the present invention, the effective voltage applied to each part divided by the scanning electrode of the pixel selected for display is different, and the field of view is different depending on each voltage value, so that the pixel as a whole The excellent effect of widening the field of vision is obtained.

[Brief explanation of drawings]

FIG. 1 is a plane configuration diagram of essential parts showing an example of a conventional liquid crystal display element, FIG. 2 is a voltage waveform diagram for driving the liquid crystal display element shown in FIG. 1, and FIG. 3 is a liquid crystal display element according to the present invention. FIG. 4 is a plan view of a main part of a liquid crystal display element for explaining one embodiment of the driving method, and FIG. 4 is a driving voltage waveform diagram thereof. (1), (2), (3), (4) + (5) + (1a)
t (1b) y (2a) s (2b ), (3
m). (3b), (4a) + (4b), (5a), (5b)
# @ @・Scanning electrode, (6), (7), (8), (9
), (10)...Signal electrode. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] In a liquid crystal display element in which a plurality of scanning electrodes and signal electrodes are arranged to intersect with each other via a liquid crystal and a pixel is formed at the intersection, one pole of the scanning electrode is divided into a plurality of electrode groups, and each electrode group has a different electrode. A driving method for liquid crystal display elements characterized by applying an effective voltage.