CN1301430C

CN1301430C - LCD apparatus

Info

Publication number: CN1301430C
Application number: CNB031471064A
Authority: CN
Inventors: 麦哲魁
Original assignee: Toppoly Optoelectronics Corp
Current assignee: Chi Mei Optoelectronics Corp; Innolux Corp
Priority date: 2003-07-01
Filing date: 2003-07-01
Publication date: 2007-02-21
Anticipated expiration: 2023-07-01
Also published as: CN1567041A

Abstract

The present invention relates to an LCD device which is composed of a first base board, a second base board, a liquid crystal layer and a first electromagnetic shielding layer, wherein a black matrix is arranged on the first base board, the liquid crystal layer is arranged between the first base board and the second base board, the first electromagnetic shielding layer is arranged on the first base board, and the first electromagnetic shielding layer is arranged corresponding to the position of the black matrix. The present invention can provide the electromagnetic protective ability of human bodies for a liquid crystal panel of the LCD device.

Description

Liquid crystal display device

Technical Field

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having excellent electromagnetic protection capability against human body.

Background

The liquid crystal display has advantages of small size, light weight, low driving voltage, low power consumption, portability, and small space occupation, and thus has gradually become a display tool of a portable terminal system in the last two decades, and is an indispensable commodity for people.

In recent years, considerable attention has been paid to the problem of the influence of electromagnetic waves on the human body. Therefore, in order to reduce the intensity of electromagnetic waves received by the human body, measures such as electromagnetic shielding are widely taken for various electronic devices used. In general, for an electronic device having a liquid crystal display module, such as a notebook computer or a liquid crystal display monitor, protection against electromagnetic interference (EMI) is performed on a housing portion of the module, for example, by using a metal housing, a coated iron sheet, painting, spraying a conductive paint, or the like.

However, the above electromagnetic protection can be performed only for the housing portion of the electronic device, and the surface of the liquid crystal panel cannot be electromagnetically protected. However, in practical use of these electronic devices having liquid crystal display modules, the liquid crystal panel is the most important part facing the human body, and when the liquid crystal panel is not electromagnetically protected, the electromagnetic waves will be emitted to the human body through the liquid crystal panel. Therefore, these electronic devices with lcd modules cannot provide good electromagnetic protection for human body.

Disclosure of Invention

Therefore, an object of the present invention is to provide a liquid crystal display device capable of providing a human body with an electromagnetic protection capability against a surface of a liquid crystal panel.

In view of the above, the present invention provides a liquid crystal display device, which includes a first substrate, a second substrate, a liquid crystal layer, and a first electromagnetic shielding layer. The first substrate is provided with a black matrix, the liquid crystal layer is arranged between the first substrate and the second substrate, the first electromagnetic shielding layer is arranged on the first substrate, and the first electromagnetic shielding layer is arranged corresponding to the position of the black matrix.

In view of the above, the present invention provides another liquid crystal display device, which includes a first substrate, a second substrate, a liquid crystal layer and a first electromagnetic shielding layer. The second substrate has a black matrix, the liquid crystal layer is disposed between the first and second substrates, the first electromagnetic shielding layer is disposed on the first substrate, and the first electromagnetic shielding layer is disposed at a position corresponding to the black matrix.

According to a preferred embodiment of the present invention, the lcd device further includes a second electromagnetic shielding layer disposed on the first substrate and covering the first electromagnetic shielding layer, wherein the second electromagnetic shielding layer is made of a transparent conductive material.

According to a preferred embodiment of the present invention, the lcd device further includes a second electromagnetic shielding layer disposed on the first substrate and between the first electromagnetic shielding layers, wherein the second electromagnetic shielding layer is made of a transparent conductive material.

According to the preferred embodiment of the present invention, the lcd device further includes a third electromagnetic shielding layer disposed on the second substrate, wherein the third electromagnetic shielding layer is disposed at a position corresponding to the black matrix.

According to a preferred embodiment of the present invention, the lcd device further includes a fourth electromagnetic shielding layer disposed on the second substrate and covering the third electromagnetic shielding layer, wherein the fourth electromagnetic shielding layer is made of a transparent conductive material.

According to a preferred embodiment of the present invention, the lcd device further includes a fourth electromagnetic shielding layer disposed on the second substrate and between the third electromagnetic shielding layers, wherein the fourth electromagnetic shielding layer is made of a transparent conductive material.

As can be seen from the above, since the electromagnetic shielding layer is disposed in the lcd device of the present invention, and the disposition position of the electromagnetic shielding layer corresponds to the non-light-transmitting region (black matrix) in the lcd device, the electromagnetic shielding layer can provide a good electromagnetic protection capability for the liquid crystal panel surface of the lcd device against human body without affecting the transmittance of the lcd device.

Drawings

In order to make the aforementioned and other objects, features, and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below. Wherein,

FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to a preferred embodiment of the invention;

FIG. 2 is a schematic cross-sectional view of a liquid crystal display device according to another preferred embodiment of the invention;

FIG. 3 is a schematic cross-sectional view of a liquid crystal display device according to another preferred embodiment of the invention;

FIG. 4 is a schematic cross-sectional view of a liquid crystal display device according to another preferred embodiment of the invention;

FIG. 5 is a top view of a color filter in an LCD device according to a preferred embodiment of the present invention;

FIG. 6 is a top view of an electromagnetic shield layer in an LCD device according to a preferred embodiment of the present invention;

fig. 7 is a top view of an electromagnetic shield layer in a liquid crystal display device in accordance with another preferred embodiment of the present invention.

Detailed Description

FIG. 1 is a cross-sectional view of a liquid crystal display device according to a preferred embodiment of the invention.

Referring to fig. 1, the structure of the liquid crystal display device of the present embodiment includes a first substrate 100, a second substrate 200, a sealant 300, and a liquid crystal layer 400 disposed between the first substrate 100 and the second substrate 200 and between the sealant 300.

The first substrate 100 is, for example, a color filter substrate, and includes a substrate 110, an electromagnetic shielding layer 120, a planarization layer 130, a color filter 140, an electrode film 150, and a polarizer 160.

The color filter 140 is disposed on a surface of the substrate 110. The color filter 140 has a plurality of red color filters 142 (as shown in FIG. 5), green color filters 142, or blue color filters 142(R, G, B). The color filters 142 are arranged in a mosaic type, a triangle type, a stripe type, or an RGGB configuration type (not shown). Between the color filters 142 is a black matrix (black matrix) 144.

Referring to fig. 1, the electromagnetic shielding layer 120 is disposed on the surface of the substrate 110 between the substrate 110 and the color filter 140 to provide an electromagnetic shielding effect for the liquid crystal panel of the liquid crystal display. The electromagnetic shielding layer 120 is disposed at a position corresponding to the opaque portion of the first substrate 100, and in this embodiment, is disposed corresponding to the mesh-shaped black matrix 144, and the disposed shape may be a mesh shape completely corresponding to the position of the black matrix 144 (see fig. 6), or a strip shape corresponding to the position of the black matrix 144 (see fig. 7).

In view of the above, considering that most of common electronic products are low current and high voltage radiation sources, and the electromagnetic interference in the near field is mainly due to the electric field, the electromagnetic shielding layer 120 of the present invention is preferably made of a good conductor material with good protection effect against the electric field, wherein the material of the electromagnetic shielding layer 120 may be a non-transparent good conductor material such as metal, or a transparent good conductor material such as indium tin oxide.

Referring to fig. 1, the planarization layer 130 is disposed between the color filter 140 and the substrate 110 and covers the electromagnetic shielding layer 120 to planarize the unevenness caused by the electromagnetic shielding layer 120, so that the color filter 140 can be formed on a planar surface. The material of the planarization layer 130 is, for example, silicon oxide.

Referring to fig. 1, the electrode film 150 is disposed on the color filter 140, wherein the electrode film 150 is made of, for example, ito. The polarizer 160 is disposed on the other surface of the substrate 110 for displaying.

Referring to fig. 1, the second substrate 200 is, for example, a matrix substrate, and includes a substrate 210, an electrode film 220, and a polarizer 230.

In the present embodiment, the electrode film 220 is, for example, a thin film transistor matrix, and is disposed on the substrate 210 for driving the liquid crystal display unit to turn on and off. The thin film transistor matrix (electrode film 220) mainly includes a plurality of thin film transistors 222 and pixel electrodes 224 disposed corresponding to each thin film transistor 222, wherein the thin film transistor matrix (electrode film 220) is, for example, a polysilicon (polysilicon) thin film transistor or an amorphous silicon thin film transistor, and the pixel electrodes 224 are, for example, indium tin oxide. Each tft 222 and the corresponding pixel electrode 224 form a pixel structure, and the pixel structures are arranged in a matrix to form a tft matrix. The polarizer 230 is disposed on the other surface of the substrate 210 for displaying.

Referring to fig. 1, the sealant 300 is disposed between the first substrate 100 and the second substrate 200 to form a closed space, and the liquid crystal layer 400 is disposed in the closed space to form a display cell.

In addition to the liquid crystal display device disclosed in fig. 1, another electromagnetic shielding layer 170 (as shown in fig. 2) may be disposed on the first substrate 100 of the liquid crystal display device of the present invention, referring to fig. 2, the electromagnetic shielding layer 170 is disposed between the gaps of the electromagnetic shielding layer 120, then the planarization layer 130 is disposed on the electromagnetic shielding layer 120 and the electromagnetic shielding layer 170, and then the color filter 140 and the electrode film 150 are sequentially disposed on the planarization layer 130. The electromagnetic shielding layer 170 may be a transparent good conductor material such as indium tin oxide.

In addition, the electromagnetic shielding layer 120 of the liquid crystal display device of the present invention may be disposed in the first substrate 100, and another electromagnetic shielding layer 240 (as shown in fig. 3) may be disposed in the second substrate 200. Referring to fig. 3, the electromagnetic shielding layer 240 and the planarization layer 250 are disposed between the substrate 210 and the tft matrix 220, wherein the electromagnetic shielding layer 240 is disposed corresponding to the black matrix 144 of the color filter 140, and the configuration shape of the electromagnetic shielding layer may be a mesh shape completely corresponding to the position of the black matrix 144 or a strip shape corresponding to the position of the black matrix 144, and the electromagnetic shielding layer 240 may be made of a non-transparent good conductor material such as metal or a transparent good conductor material such as indium tin oxide.

In addition, the color filter 140 of the present invention can be disposed in the second substrate 200 (as shown in fig. 4) in addition to the first substrate 100, and referring to fig. 4, the color filter 260 and the planarization layer 270 are disposed between the substrate 210 and the tft matrix 220, wherein the color filter 260 has a plurality of red color filters 262, green color filters 262, or blue color filters 262(R, G, B). The color filters 262 are arranged in a mosaic, triangle, stripe, or RGGB configuration (not shown). A black matrix 264 is formed between the color filters 262.

Moreover, in the above embodiments, an alignment film (not shown) may be disposed between the first substrate 100 and the liquid crystal layer 400 and between the second substrate 200 and the liquid crystal layer 400, however, it is known to those skilled in the art that the alignment film is used for aligning the liquid crystal molecules disposed thereon in a certain direction to achieve the pre-tilt of the liquid crystal molecules, and the alignment film is not limited to be disposed when the purpose can be achieved.

In addition, in the above embodiment, a backlight module (not shown) may be provided below the polarizer 230, and similarly, the purpose of the black matrix is to provide a light source for the lcd device to emit light.

In the above embodiments of the invention, the electromagnetic shielding layer 120 is a mesh structure or a strip structure corresponding to the black matrix 144 of the color filter 140, or a composite structure formed by disposing another electromagnetic shielding layer 170 in the gap between the electromagnetic shielding layers 120, but the invention is not limited thereto, for example, when a transparent good conductor material is used, a flat transparent good conductor material layer may be formed to replace the flat layer 130 in fig. 1, or even a flat transparent good conductor material layer may be directly disposed between the substrate 110 and the color filter 140 to replace the electromagnetic shielding layer 120 and the flat layer 130 in fig. 1.

Therefore, when the electromagnetic shielding layer is disposed on the first substrate 100 or the second substrate 200, the structure of the electromagnetic shielding layer can arbitrarily adopt one of the above-mentioned various structures to be disposed in the first substrate 100 or the second substrate 200, and when the electromagnetic shielding layer is simultaneously disposed on the first substrate 100 and the second substrate 200, the structure of the electromagnetic shielding layer can independently adopt one of the above-mentioned various structures to be disposed in the first substrate 100 and the second substrate 200.

In the above embodiments, a transmissive tft-lcd is illustrated, however, the invention is not limited thereto, and the invention can also be applied to a diode matrix lcd using diodes as active elements, for example, diode elements are used to drive the liquid crystal elements instead of the tft 222 in fig. 1.

Besides, the invention can be applied to an active matrix (active matrix) lcd such as a tft-lcd and a diode matrix lcd, and can also be applied to a passive matrix (passive matrix) lcd, for example, a strip-shaped electrode film is used to replace the electrode film 150 of the first substrate 100 and the tft-array (electrode film 220) of the second substrate, and the electrode film of the first substrate 100 and the electrode film of the second substrate 200 are perpendicular to each other.

Besides the transmissive lcd, the present invention can also be applied to the reflective lcd, for example, a reflective layer is disposed between the substrate 210 of the second substrate 200 and the thin film transistor matrix (electrode film 220) or the long-strip-shaped electrode film, and the front light module is disposed above the polarizer 160 of the first substrate 100 to replace the backlight module.

In summary, since the lcd device of the present invention is provided with the electromagnetic shielding layer, and the disposition position of the electromagnetic shielding layer corresponds to the non-light-transmitting region (black matrix) in the lcd device, the electromagnetic shielding layer can be disposed through the electromagnetic shielding layer without affecting the transmittance of the lcd device, so as to provide a good electromagnetic protection capability of the surface portion of the liquid crystal panel of the lcd device against human body.

Moreover, the electromagnetic shielding layer of the invention can be widely applied to various types of liquid crystal display devices such as an active matrix liquid crystal display, a passive matrix liquid crystal display, a transmission type liquid crystal display, a reflection type liquid crystal display and the like so as to provide good electromagnetic protection effect of the surface part of the liquid crystal panel of the liquid crystal display device on a human body.

Although the present invention has been described with reference to preferred embodiments, the above description is not intended to limit the present invention, and any person skilled in the art can make modifications and variations without departing from the spirit and scope of the present invention, and therefore the scope of the present invention is to be determined by the claims appended hereto.

Claims

1. A liquid crystal display device comprising:

a first substrate;

a second substrate;

a black matrix disposed on one of the first substrate and the second substrate; and

a liquid crystal layer disposed between the first substrate and the second substrate,

it is characterized by also comprising: the first electromagnetic shielding layer is arranged on the first substrate and corresponds to the position of the black matrix.

2. The liquid crystal display device of claim 1, wherein the first electromagnetic shielding layer is made of one material selected from the group consisting of non-transparent conductive materials and transparent conductive materials.

3. The liquid crystal display device of claim 2, further comprising a second electromagnetic shielding layer disposed on the first substrate and covering the first electromagnetic shielding layer, wherein the second electromagnetic shielding layer is made of transparent conductive material.

4. The liquid crystal display device of claim 2, further comprising a second electromagnetic shielding layer disposed on the first substrate and between the first electromagnetic shielding layers, wherein the second electromagnetic shielding layer is made of transparent conductive material.

5. The liquid crystal display device of claim 1, further comprising a first electrode film disposed on the first substrate; a second electrode film disposed on the second substrate.

6. The liquid crystal display device of claim 1, further comprising a third electromagnetic shielding layer disposed on the second substrate, the third electromagnetic shielding layer being disposed at a position corresponding to the black matrix.

7. The liquid crystal display device of claim 6, wherein the third electromagnetic shielding layer comprises one selected from the group consisting of non-transparent conductive material and transparent conductive material.

8. The liquid crystal display device of claim 7, further comprising a fourth electromagnetic shielding layer disposed on the second substrate and covering the third electromagnetic shielding layer, wherein the fourth electromagnetic shielding layer is made of transparent conductive material.

9. The liquid crystal display device of claim 7, further comprising a fourth electromagnetic shielding layer disposed on the second substrate and between the third electromagnetic shielding layers, wherein the fourth electromagnetic shielding layer is made of transparent conductive material.

10. The device of claim 1, further comprising a color filter disposed on one of the first substrate and the second substrate.