CN100420996C - Multi-view vertical alignment liquid crystal display - Google Patents

Abstract

The invention discloses a multi-view vertical alignment liquid crystal display. The display includes a plurality of pixel electrodes. The pixel electrodes define a plurality of pixels, and the pixels are arranged in an array. When the pixel electrode receives a voltage, the absolute voltage difference between the main electrode and the common electrode is the largest, the absolute voltage difference between the sub electrode and the common electrode is the second, and the absolute voltage difference between the low electrode and the common electrode is the smallest.

Description

Multi-view Vertical Alignment Liquid Crystal Display

technical field

The invention relates to a liquid crystal display, and in particular to a multi-view vertical alignment liquid crystal display.

Background technique

Multidomain Vertical Alignment Liquid Crystal Display (MVA LCD) has the characteristics of wide viewing angle, which can improve the problem of too small viewing angle of general liquid crystal display. FIG. 1 is a cross-sectional view of a conventional multi-view vertical alignment liquid crystal display without voltage application. In Fig. 1, an electrode (electrode) 12a is formed on a substrate (substrate) 11a, a bump (bump) 13a made of an insulating material (insulating material) is formed on the electrode 12a, and a vertical alignment film 14a covers the electrodes 12a and Bump 13a. In addition, the electrode 12b is formed under the substrate 11b, the bump 13b made of insulating material is formed under the electrode 12b, and the vertical alignment film 14b covers the electrode 12b and the bump 13b.

When no voltage is applied between the electrodes 12a and 12b, the liquid crystal molecules 15 tend to align in a direction perpendicular to the alignment film. When a voltage is applied between the electrodes 12a and 12b, the liquid crystal molecules 15 near the bumps 13a and 13b will affect the inclination of the liquid crystal molecules 15 farther away from the bumps 13a and 13b. That is to say, the liquid crystal molecules 15 will be relatively inclined on both sides of the bumps 13a and 13b. In this way, the liquid crystal molecules 15 will automatically form multiple display domains. In this way, an MVALCD with a wide viewing angle can be obtained.

For other types of MVA LCD, for example, bumps are provided on the upper substrate and slits are provided on the lower substrate; or slits are provided on both the upper substrate and the lower substrate. Generally speaking, the power of the electric field is used to cause stable different inclinations. However, these MVA LCDs need to be processed on the upper substrate and the lower substrate, which increases the complexity and cost of the process.

Contents of the invention

In view of this, the object of the present invention is to provide a multi-view vertical alignment liquid crystal display with simplified process.

According to the purpose of the present invention, a multi-view field vertical alignment liquid crystal display is proposed, comprising: a first substrate and a second substrate, and the second substrate and the first substrate are arranged in parallel to form a gap; liquid crystal material is filled in the gap; vertical alignment When there is no electric field, the alignment film makes the liquid crystal molecules perpendicular to the surface of the alignment film; the common electrode is formed on the inner surface of the second substrate; a plurality of pixel electrodes are formed on the inner surface of the first substrate. The pixel electrodes define a plurality of pixels, and the pixels are arranged in an array. Each pixel electrode includes a main electrode, a sub electrode and a low electrode. When the pixel electrode receives a voltage, the absolute voltage difference between the main electrode and the common electrode is the largest, and the absolute voltage difference between the sub electrode and the common electrode is second. The low electrode The absolute voltage difference with the common electrode is minimal.

Description of drawings

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, a preferred embodiment is specifically cited below, together with the accompanying drawings, as follows in detail. In the figure:

FIG. 1 is a cross-sectional view of a conventional multi-view vertical alignment liquid crystal display without voltage application;

2 shows a plan view of a pixel of a multi-view vertical alignment liquid crystal display according to a first embodiment of the present invention;

Figure 3 is a sectional view along the line AA' of Figure 2; and

FIG. 4 shows a plan view of a pixel of a multi-view vertical alignment liquid crystal display according to a second embodiment of the present invention.

The reference signs in the accompanying drawings are explained as follows:

11a, 11b: substrate 12a, 12b: electrodes

13a, 13b: bumps 14a, 14b: vertical alignment film

15: Liquid crystal molecule 21: Data line

22: Gate line 23: Source

24: Drain 25: Pixel

26, 46: main slit 27, 47: sub-slit

28, 48: main electrode 29, 49: sub-electrode

31: Power line 32: High voltage area

33: Secondary voltage area 34: Low voltage area

Detailed ways

The spirit of the present invention is to cut slits on only one substrate to create a multi-view effect. A slit is used in a pixel electrode to generate three different voltages of high, medium and low, so that the electric force line is inclined, and the liquid crystal molecules of the same pixel have different inclination angles, thus forming multiple viewing areas.

Please refer to FIG. 2 , which shows a plan view of a pixel of a multi-view vertical alignment liquid crystal display according to a first embodiment of the present invention. Please also refer to FIG. 3 , which shows a cross-sectional view along line AA in FIG. 2 . The liquid crystal display includes substrates 11a, 11b, a common electrode 12b, a pixel electrode 25, vertical alignment films 14a, 14b and a liquid crystal material filled between the substrates 11a and 11b. The liquid crystal material is a negative type, that is, its liquid crystal molecules tend to align vertically to the direction of the electric field. In FIG. 2 , a pixel of the liquid crystal display at least includes a data line 21 , a gate line 22 , a source 23 , a drain 24 and a pixel electrode 25 . The pixel electrode 25 includes a strip-shaped main slit (main slit) 26 , two strip-shaped main electrodes 28 and four sets of grid electrodes. The main slit 26 is located on the diagonal of the pixel electrode 25 , and the main electrode 28 is substantially parallel to the main slit 25 . Grid electrodes are located on both sides of the main electrode 28 . The grid electrode is formed by a plurality of elongated sub-slits 27 and a plurality of elongated sub-electrodes 29 arranged alternately.

When a voltage is applied between the pixel electrode and the common electrode, from a macroscopic point of view, the absolute voltage difference between the main electrode 28 and the common electrode is the highest, followed by the absolute voltage difference between the grid electrode and the common electrode, and the main slit 26 has the lowest absolute voltage difference with the common electrode. Please refer to Figure 3. The direction of the electric field is shown by the lines of force 31 . Region 32 corresponds to the main electrode 28, that is, the high voltage region, which has the largest electric field; region 33 corresponds to the grid electrode, which is the secondary voltage region, and has the second largest electric field; region 34 corresponds to the main slit 25 , that is, the low voltage region, has the smallest electric field; therefore, the inclination directions of the electric force lines 31 are different, so that the liquid crystal molecules in the same pixel have different inclination angles, thus achieving the effect of multi-view. It can be seen from the first embodiment that the multi-view effect can be realized by only manufacturing slits on one substrate.

Please refer to FIG. 4 , which shows a plan view of a pixel of a multi-view vertical alignment liquid crystal display according to a second embodiment of the present invention. A pixel of the liquid crystal display at least includes a data line 21 , a gate line 22 , a source 23 , a drain 24 and a pixel electrode 45 . The pixel electrode 45 includes two strip-shaped main slits 46 , four strip-shaped main electrodes 48 and four sets of grid electrodes. The main slit 46 divides the pixel electrode 45 into four viewing areas. Grid electrodes are located on both sides of the main electrode 48 . The grid electrode is formed by a plurality of elongated sub-slits 47 and a plurality of elongated sub-electrodes 49 arranged alternately.

When a voltage is applied between the pixel electrode 45 and the common electrode, from a macroscopic point of view, the absolute voltage difference between the main electrode 48 and the common electrode is the highest, followed by the absolute voltage difference between the grid electrode and the common electrode, and the main narrow electrode The absolute voltage difference between the slot 46 and the common electrode is the lowest. The inclination directions of the electric force lines in each viewing area are different, so that the liquid crystal molecules in the same pixel have different inclination angles, thereby realizing the effect of multi-viewing areas.

The multi-view field vertical alignment liquid crystal display disclosed in the above-mentioned embodiments of the present invention can realize the effect of multi-view fields only by manufacturing slits on one substrate, and the traditional bump technology is omitted. Since the bump is omitted, the time for filling the liquid crystal material is greatly reduced, and it is found through experiments that about 2/3 of the time is saved.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention, and those skilled in the art can make various modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims (15)

1. ken homeotropic liquid crystal display more than a kind comprises:

First substrate and second substrate, this second substrate and this first substrate are arranged in parallel, and form one at interval;

Liquid crystal material is filled in this interval;

The vertical orientation film, when not having electric field to impose on this liquid crystal material, this alignment film makes the surface of the liquid crystal molecule of this liquid crystal material perpendicular to this alignment film;

Public electrode is formed at the inner face of this second substrate; And

A plurality of pixel electrodes are formed at the inner face of this first substrate, and those pixel electrodes define a plurality of pixels, and those pixels are with array format, and each those pixel electrode comprises:

Main slit, in order to this pixel electrode is divided into a plurality of area electrodes, so that this pixel has corresponding a plurality of fields, respectively this area electrodes comprises:

Central electrode is in the middle part of this area electrodes; And

Gate-shaped electrode, in the next door of this central electrode, this gate-shaped electrode has a plurality of sub-slits and conductive a plurality of sub-electrode, and this a little slit and those sub-electrodes are staggered.

2. many kens homeotropic liquid crystal display as claimed in claim 1, wherein this main slit is wider than arbitrary those sub-electrodes and this a little slit.

3. many kens homeotropic liquid crystal display as claimed in claim 1, wherein this central electrode is wider than arbitrary those sub-electrodes and this a little slit.

4. many kens homeotropic liquid crystal display as claimed in claim 1, wherein this main slit is divided into a plurality of area electrodes with this pixel electrode diagonally.

5. many kens homeotropic liquid crystal display as claimed in claim 5, wherein this central electrode is parallel with this main slit in fact.

6. many kens homeotropic liquid crystal display as claimed in claim 1, wherein respectively this pixel electrode comprises a plurality of these main slits, those main slits are divided into a plurality of these area electrodes with this pixel electrode.

7. many kens homeotropic liquid crystal display as claimed in claim 1, wherein this liquid crystal material is a minus.

8. ken homeotropic liquid crystal display more than a kind comprises:

First substrate and second substrate, this second substrate and this first substrate are arranged in parallel, and form one at interval;

Liquid crystal material is filled in this interval;

Alignment film, when not having electric field to impose on this liquid crystal material, this alignment film makes the surface of the liquid crystal molecule of this liquid crystal material perpendicular to this alignment film;

Public electrode is formed at the inner face of this second substrate; And

A plurality of pixel electrodes are formed at the inner face of this first substrate, those pixel electrodes define a plurality of pixels, those pixels are with array format, each those pixel electrode comprises central electrode, sub-electrode and low electrode, when this pixel electrode receives a voltage, the absolute voltage difference of absolute voltage difference maximum, this sub-electrode and this public electrode of this central electrode and this public electrode is taken second place, the absolute voltage difference minimum of this low electrode and this public electrode;

Wherein this low electrode is main slit, and in order to this pixel electrode is divided into a plurality of area electrodes, so that this pixel has corresponding a plurality of fields, respectively this area electrodes comprises:

Central electrode is in the middle part of this area electrodes; And

Gate-shaped electrode, as described sub-electrode, it is positioned at the next door of this central electrode, and this gate-shaped electrode has a plurality of sub-slits and conductive a plurality of sub-electrode, and this a little slit and those sub-electrodes are staggered.

9. many kens homeotropic liquid crystal display as claimed in claim 8, wherein this main slit is wider than arbitrary those sub-electrodes and this a little slit.

10. many kens homeotropic liquid crystal display as claimed in claim 8, wherein this central electrode is wider than arbitrary those sub-electrodes and this a little slit.

11. many kens homeotropic liquid crystal display as claimed in claim 8, wherein this main slit is divided into this pixel electrode a plurality of these area electrodes diagonally.

12. many kens homeotropic liquid crystal display as claimed in claim 11, wherein this central electrode is parallel with this main slit in fact.

13. many kens homeotropic liquid crystal display as claimed in claim 8, wherein respectively this pixel electrode comprises a plurality of these main slits of intersection, and those main slits are divided into a plurality of these area electrodes with this pixel electrode.

14. many kens homeotropic liquid crystal display as claimed in claim 8, wherein this LCD also comprises:

One first Polarizer and one second Polarizer lay respectively at the outside of this first substrate and this second substrate.

15. many kens homeotropic liquid crystal display as claimed in claim 8, wherein this liquid crystal material is a minus.

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