WO2016127340A1

WO2016127340A1 - Fringe field switch type liquid crystal display device

Info

Publication number: WO2016127340A1
Application number: PCT/CN2015/072771
Authority: WO
Inventors: 梁艳峰; 王裕; 罗红磊; 谢亮
Original assignee: 华为技术有限公司
Priority date: 2015-02-11
Filing date: 2015-02-11
Publication date: 2016-08-18
Also published as: CN107209428A

Abstract

A fringe field switch type liquid crystal display device. The device comprises a plurality of pixel electrodes (4) and a common electrode (2). The plurality of pixel electrodes (4) are arranged side by side and are arranged opposite the common electrode (2), characterized in that a middle area of each pixel electrode of the plurality of pixel electrodes (4) is hollowed to form a gap. The strength of an electric field above a pixel electrode can be enhanced, and the transmittance of a liquid crystal display device is improved.

Description

Edge electric field switch type liquid crystal display device

Technical field

The present invention relates to a liquid crystal display device, and more particularly to a fringe field switching (FFS) liquid crystal display device.

Background technique

Since the liquid crystal display device has the advantages of being light, light, thin, and low in power consumption, it is widely used in modern information devices such as notebook computers and personal digital assistants. The liquid crystal in the liquid crystal display device itself does not have the luminescent property, and the electric field is used to control the twist of the liquid crystal molecules to achieve the passage or non-pass of light, thereby achieving the purpose of display. In a conventional liquid crystal display device, electrodes are formed on the surfaces of two transparent substrates, a voltage is applied to form an electric field for controlling the twist of the liquid crystal molecules, and electrodes of the two transparent substrates are opposed to each other, thereby forming an electric field perpendicular to the surface of the transparent substrate. Since the liquid crystal molecules are electrically conductive, the orientation of the liquid crystal molecules will be perpendicular to the surface of the transparent substrate under the control of the electric field, but the orientation of the liquid crystal molecules cannot be completely vertical due to the interaction force between the liquid crystal molecules and the physical force such as gravity. On the surface of the substrate, and the inclination angles of the liquid crystal molecules are not the same, when the observer observes from different angles, different display effects will be observed, which is a viewing angle defect of the liquid crystal display device.

In the prior art solution, in order to overcome the visual range defect of the liquid crystal molecules of the liquid crystal display device, a fringe field switching type liquid crystal display device is proposed. As shown in FIG. 1 , the liquid crystal display device includes a first transparent substrate 7 and a second transparent substrate 1 disposed opposite to each other. The liquid crystal layer 6 is distributed between the first transparent substrate 7 and the second transparent substrate 1 , and the liquid crystal layer 6 is composed of a large amount. The liquid crystal molecules are arranged in an order, the common electrode 2 is disposed on the second transparent substrate 1, the transparent insulating layer 3 is covered on the common electrode 2, the plurality of pixel electrodes 4 are disposed on the transparent insulating layer 3, and the alignment film 5 is disposed on On the plurality of pixel electrodes and the transparent insulating layer, the alignment film 5 aligns the liquid crystal molecules of the liquid crystal layer before the electric field is formed. When a voltage is applied to the liquid crystal display device, an electric field is formed between the pixel electrode and the common electrode. Under the control of the electric field, the liquid crystal molecules are oriented perpendicular to the surfaces of the two transparent substrates, thereby expanding the viewing angle of the liquid crystal display device. However, as shown in FIG. 2, the light-transmitting region is formed by the electric field between the pixel electrode and the common electrode, and the transmittance is not high because the electric field strength above the pixel electrode is insufficient.

Summary of the invention

The invention provides a fringe field switching type liquid crystal display device, which can enhance the electric field intensity above the pixel electrode and improve the transmittance of the liquid crystal display device.

A first aspect of the embodiments of the present invention provides a fringe field switching type liquid crystal display device, the device comprising a plurality of pixel electrodes and a common electrode, the plurality of pixel electrodes being arranged side by side and opposite to the common electrode, The intermediate portion of each of the plurality of pixel electrodes is hollowed out to form a void.

In a first possible implementation manner of the first aspect, the plurality of pixel electrodes and the common electrode are indium tin metal oxide.

In a second possible implementation manner of the first aspect, a spacing distance between two adjacent ones of the plurality of pixel electrodes is the same.

In a third possible implementation manner of the first aspect, the device further includes a first transparent substrate and a second transparent substrate, where the first transparent substrate is opposite to the second transparent substrate, and the plurality of pixels The electrode and the common electrode are both located between the first transparent substrate and the second transparent substrate.

In conjunction with the third possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the device further includes a liquid crystal layer, where the liquid crystal layer is located on the first transparent substrate Between the pixel electrodes.

In a fifth possible implementation manner of the first aspect, a transparent insulating layer is disposed between the common electrode and the plurality of pixel electrodes.

In a sixth possible implementation of the first aspect, the apparatus further includes an alignment film disposed on the plurality of pixel electrodes.

Embodiments of the present invention are directed to the technical problem that the electric field intensity above the pixel electrode is insufficient to cause a low transmittance, and the pixel is enhanced by hollowing out a middle region of each of the plurality of pixel electrodes to form a gap. The electric field intensity above the electrode increases the transmittance of the liquid crystal display device.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.

1 is a cross-sectional view showing a fringe field switching type liquid crystal display device in a prior art solution;

2 is a schematic diagram showing the transmittance of a fringe field switching type liquid crystal display device in the prior art;

3A is a schematic diagram of electric field distribution of a fringe field switching type liquid crystal display device in a prior art solution;

3B is a cross-sectional view showing a fringe field switching type liquid crystal display device according to a first embodiment of the present invention;

4 is a schematic view showing an effect of hollowing out an intermediate portion of a pixel electrode in the embodiment of the present invention to form a void;

Figure 5 is a cross-sectional view showing a fringe field switching type liquid crystal display device according to a second embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 3B. FIG. 3B is a cross-sectional view showing a fringe field switching type liquid crystal display device according to a first embodiment of the present invention. As shown in the figure, a fringe field switching type liquid crystal display device according to an embodiment of the present invention includes a plurality of pixel electrodes and a common electrode, the plurality of pixel electrodes being arranged side by side and opposite to the common electrode, the plurality of The intermediate portion of each of the pixel electrodes is hollowed out to form a void. As shown in FIGS. 3A and 3B, in the cross-sectional view shown in FIG. 3B, there is a space in the middle of each of the pixel electrodes, which is formed because the intermediate portion of the pixel electrode is hollowed out. As shown in FIG. 4, the intermediate region of the pixel electrode is hollowed out to form a void. The distance between the arrow 3 and the arrow 4 is the width of each pixel electrode, and the width is generally about 2.5 um, as indicated by the arrow 2. The strip-shaped blank area from top to bottom is a space formed by hollowing out the intermediate portion of the pixel electrode, and the width of the gap may be 1 um or 2 um, but is not limited to the above width.

It should be noted that the method of laser selective crystallization can be performed by hollowing out the intermediate portion of the pixel electrode to form a void. Specifically, first, a pixel electrode in an amorphous state is firstly sputtered by a laser. For a peripheral region where the pixel electrode does not need to be removed, a laser can be used to illuminate a peripheral region of the pixel electrode, and an intermediate region where the pixel electrode needs to be hollowed out is not used. Use laser irradiation. Then, the pixel electrode is etched using oxalic acid, and the oxalic acid can not be etched for the peripheral region of the pixel electrode irradiated by the laser; and the oxalic acid can be etched away for the intermediate portion of the pixel electrode not irradiated by the laser, so that the pixel electrode can be The middle area is hollowed out to form a void.

As shown in FIG. 3A, FIG. 3A is a schematic diagram of electric field distribution of a fringe field switching type liquid crystal display device in the prior art. As can be seen from the figure, the electric field intensity between the two pixel electrodes is higher than that of the pixel electrode. The electric field strength above, so the transmittance above the pixel electrode is lower. In the embodiment of the present invention, as shown in FIG. 3B, since the intermediate portion of the pixel electrode is hollowed out to form a gap, an electric field formed by the pixel electrode and the common electrode can penetrate through the gap to the pixel electrode, thereby enhancing the upper portion of the pixel electrode. The electric field strength thus increases the transmittance above the pixel electrode.

Optionally, the plurality of pixel electrodes and the common electrode are indium tin oxide (ITO).

Optionally, the spacing distance between two adjacent ones of the plurality of pixel electrodes is the same. Wherein, the separation distance may be 3.5 um or 4 um, but is not limited to the above distance.

In an embodiment of the invention, the edge electric field switch type liquid crystal display device includes a plurality of pixel electrodes and a common electrode, and the plurality of pixel electrodes are arranged side by side and disposed opposite to the common electrode by the middle of each of the plurality of pixel electrodes The area is hollowed out to form a void, thereby enhancing the electric field strength above the pixel electrode and improving the transmittance of the liquid crystal display device.

As shown in FIG. 5, FIG. 5 is a cross-sectional view showing a fringe field switching type liquid crystal display device according to a second embodiment of the present invention. The device includes a plurality of pixel electrodes 4, a common electrode 2, a first transparent substrate 7, a second transparent substrate 1, a liquid crystal layer 6, a transparent insulating layer 3, and an alignment film 5, and the plurality of pixel electrodes 4 are arranged side by side and with the common electrode 2, the intermediate portion of each of the plurality of pixel electrodes 4 is hollowed out to form a gap, and the first transparent substrate 7 is disposed opposite to the second transparent substrate 1 The plurality of pixel electrodes 4 and the common electrode 2 are located between the first transparent substrate 7 and the second transparent substrate 1, and the liquid crystal layer 6 is located between the first transparent substrate 7 and the plurality of pixel electrodes 4, and the common electrode 2 and the plurality of pixels A transparent insulating layer 3 is disposed between the electrodes 4, and the alignment film 5 is disposed on the plurality of pixel electrodes 4. As shown in FIG. 4, the intermediate region of the pixel electrode is hollowed out to form a void. The distance between the arrow 3 and the arrow 4 is the width of each pixel electrode, and the width is generally about 2.5 um, as indicated by the arrow 2. The strip blank area from top to bottom is a space formed by hollowing out the intermediate portion of the pixel electrode, and the width of the gap may be 1 um or 2 um, but is not limited to the above width.

It should be noted that, for the foregoing various method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment can be referred to the related descriptions of other embodiments.

A person skilled in the art may understand that all or part of the various steps of the foregoing embodiments may be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, Read-Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.

The content downloading method and the related device and system provided by the embodiments of the present invention are described in detail above. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for the person of ordinary skill in the art, according to the idea of the present invention, there are some changes in the specific embodiment and the scope of application. In summary, the content of the specification should not be understood. To limit the invention.

Claims

A fringe field switching type liquid crystal display device, the device comprising a plurality of pixel electrodes and a common electrode, the plurality of pixel electrodes being arranged side by side and opposite to the common electrode, wherein the plurality of pixel electrodes are The intermediate portion of each of the pixel electrodes is hollowed out to form a void.
The device according to claim 1, wherein said plurality of pixel electrodes and said common electrode are indium tin metal oxide.
The apparatus according to claim 1, wherein a spacing distance between adjacent ones of said plurality of pixel electrodes is the same.
The device according to claim 1, further comprising a first transparent substrate and a second transparent substrate, wherein the first transparent substrate is disposed opposite to the second transparent substrate, and the plurality of pixel electrodes And the common electrode is located between the first transparent substrate and the second transparent substrate.
The device according to claim 4, further comprising a liquid crystal layer between the first transparent substrate and the plurality of pixel electrodes.
The device according to claim 1, wherein a transparent insulating layer is disposed between said common electrode and said plurality of pixel electrodes.
The device according to claim 1, further comprising an alignment film disposed on said plurality of pixel electrodes.