This application claims the priority benefit of Taiwan application serial no. 9 3106430, filed Mar. 11, 2004.
1. Field of the Invention
The present invention relates to a wide viewing angle liquid crystal display (LCD). More particularly, the present invention relates to a multi-domain vertical alignment (MVA) liquid crystal display (LCD).
2. Description of Related Art
In recent years, the liquid crystal display (LCD) is being developed for higher resolution, higher brightness, higher contrast, wider viewing angle, larger display area and higher color resolution. However, the conventional LCD has the disadvantages of narrow range of viewing angle and high price, and the increasing the range of the viewing angle and reducing the cost are important. Presently, a variety of wide viewing angle liquid crystal displays such as multi-domain vertical alignment (MVA) LCD, in-plane switching (IPS) LCD and fringe field switching (FFS) LCD has been developed. In the MVA LCD, the area of the liquid crystal of every pixel is divided into a plurality of sub-areas, therefore the liquid crystal molecule may have a plurality of tilt directions, and thus the range of the viewing angle of the LCD is enhanced.
Generally, in order to increase the viewing angle of the liquid crystal display, a plurality of stripe slits 114 are formed in the pixel electrode 112, and a plurality of stripe protrusions 118 are formed on the opposite substrate (not shown) having a color filter layer. Alternatively, a plurality of stripe protrusions 118 are disposed on the pixel electrode 112, and a plurality of stripe slits 114 are formed on the electrode film (not shown) of the opposite substrate having a color filter layer. Therefore, the liquid crystal molecule disposed between the two substrates may have a variety of tilt directions by the aid of the slit 114 and the protrusion 118. Therefore, the range of the viewing angle of the LCD may be enhanced.
Although the range of the view angle at the horizontal and vertical direction of the MVA LCD described above is enhanced with the aid of the protrusions 118 and the slits 114, however, it should be noted that the tilt direction of the liquid crystal molecule of the MVA LCD is limited in the four specific directions. Therefore, the performance of the range of the view angle of the MVA LCD at another direction, especially at the upper-right, lower-right, upper-left, lower-left direction, is not as good as that at the horizontal and vertical direction. Thus, although the MVA LCD described above is a type of wide viewing angle LCD, however, the development of the MVA LCD is limited due to problems described above. Accordingly, the development of a MVA LCD having more tilt direction of liquid crystal is highly desired.
Accordingly, the present invention is directed to a multi-domain vertical alignment (MVA) liquid crystal display (LCD) with a wider range of the viewing angle compared to the conventional MVA LCD. According to an embodiment of the present invention, the MVA LCD with full range of viewing angle is provided.
According to one embodiment of the present invention, a multi-domain vertical alignment (MVA) liquid crystal display (LCD) comprising a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate is provided. In addition, a plurality of first protrusions comprising a plurality of radiation-shaped protrusions arranged in stripe is formed over the first substrate. Moreover, a plurality of second protrusions comprising a plurality of stripe protrusions is formed over the second substrate. The first protrusions and the second protrusions are interlaced correspondingly.
According to another embodiment of the present invention, a multi-domain vertical alignment (MVA) liquid crystal display (LCD) comprising a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate is provided. In addition, a first electrode film including a plurality of first slits is formed over the first substrate, wherein the first slits comprise a plurality of radiation-shaped slits arranged in stripe. Moreover, a second electrode film including a plurality of second slits is formed over the second substrate, wherein the second slit comprises a plurality of stripe slits. The first slit and second slit are interlaced correspondingly.
According to still another embodiment of the present invention, a multi-domain vertical alignment (MVA) liquid crystal display (LCD) comprising a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate is provided. A plurality of protrusions including a plurality of radiation-shaped protrusions arranged in stripe is formed over the first substrate. In addition, an electrode film including a plurality of slits is formed over the second substrate, wherein the slits comprise stripe slits. The protrusions and slits are interlaced correspondingly.
According to yet another embodiment of the present invention, a multi-domain vertical alignment (MVA) liquid crystal display (LCD) comprising a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate is provided. An electrode film including a plurality of slits is formed over the first substrate, wherein the slits comprise a plurality of radiation-shaped slits arranged in stripe. In addition, a plurality of protrusions is formed over the second substrate, wherein the protrusions comprise stripe protrusions. The protrusions and the slits are interlaced correspondingly.
Accordingly, because the radiation-shaped protrusions are arranged in stripe or the radiation-shaped slits, therefore the liquid crystal molecules of the MVA LCD may have more tilt directions, and thus the tilt area may be more symmetric. Thus, the MVA LCD of the present invention may have a full range of viewing angle.
One or part or all of these and other features and advantages of the present invention will become readily apparent to those skilled in this art from the following description wherein there is shown and described one embodiment of this invention, simply by way of illustration of one of the modes best suited to carry out the invention. As it will be realized, the invention is capable of different embodiments, and its several details are capable of modifications in various, obvious aspects all without departing from the invention. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Referring to
The first substrate 200 includes, for example but not limited to, the color filter layer 206 disposed there-over. The color filter layer 206 includes, for example but not limited to, a plurality of red color filter films (R), a plurality of green color filter films (G) and a plurality of blue color filter films (B). In addition, a black matrix layer is formed between the red color filter films, the green color filter films and the blue color filter films. Moreover, the color filter layer 206 may further include an electrode film 208. The material of the electrode film 208 includes, for example but not limited to, indium tin oxide (ITO). In addition, a plurality of stripe protrusions 210 may be formed over the electrode film 208. The material of the stripe protrusions 210 includes, for example but not limited to, a transparent polymer material.
Moreover, scanning lines 212, data lines 214, switch components (for example but not limited to, thin film transistors) 216 and pixel electrodes 218 may also be formed, for example but not limited to, over the second substrate 202. Each thin film transistors 216 includes a gate electrode 220, a channel layer 222, and a source electrode/drain electrode 224a/224b. The gate electrode 220 is electrically connected to the scanning line 212, and the source electrode 224a is electrically connected to the data line 214. The drain electrode 224b is electrically connected to the pixel electrode 218 via the contact window 226.
In addition, a plurality of protrusions 228 is disposed over the pixel electrode 218, and the protrusion 228 includes a plurality of radiation-shaped protrusions 230 arranged in stripe. The stripe protrusions 210 and the radiation-shaped protrusions 230 arranged in stripe are interlaced correspondingly. The material of the radiation-shaped protrusions 230 includes, for example but not limited to, a transparent polymer material. In one embodiment of the present invention, the radiation-shaped protrusions 230 includes, for example but not limited to, X-shaped protrusions as shown in
It is noted that, the radiation-shaped protrusions 230 arranged in stripe is provided for replacing the conventional stripe protrusions. Therefore, when the MVA LCD of the present invention is operated, the liquid crystal molecules 234 of the liquid crystal layer 204 are tilted along the distribution direction of the virtual line 233 as the enlarged local area 232 of
In addition, in one embodiment of the present invention, the round-shaped protrusion 236 may be further disposed over the electrode film 208 of the opposite substrate in the gap between two adjacent radiation-shaped protrusions 230. Therefore, the phenomenon of generating disclination area may be avoided at the interface between two adjacent radiation-shaped protrusions 230 when the liquid crystal molecules 234 are under the action of the electric field. In other words, the lateral extension of the field line of the electric field is limited by disposing the round-shaped protrusions 236. Therefore, the problem of discontinuous arrangement of the liquid crystal molecules 234 at the interface between two adjacent radiation-shaped protrusions 230 is avoided, and thus the possibility of generating disclination area can be reduced.
Moreover, in one embodiment of the present invention, the linear protrusions 237 as shown in
Moreover, in the embodiment described above, the radiation-shaped protrusions 230 arranged in stripe may also be disposed over the electrode film 208 of the first substrate 200 as illustrated in
Furthermore, according to an embodiment of the present invention, the slits may also be utilized instead of using protrusions 210, 228 and 230 in a manner that the liquid crystal molecules 234 have more tilt directions with respect to the slits. Therefore, the range of the viewing angle is increased. Hereinafter, the related embodiments will be described.
Referring to the embodiment of the present invention shown in
Moreover, in another embodiment of the present invention, round-shaped slit or linear slit may also be disposed in the electrode film 208a of the opposite substrate in the gap between two adjacent radiation-shaped slits 240. The position of the round-shaped slit or linear slit may be same as that of the round-shaped protrusion 236 (as shown in
In addition, in the embodiment described above, the radiation-shaped slits 240 arranged in stripe may also be disposed over the electrode film 208a formed over the first substrate 200 as illustrated in
Furthermore, the silts along with the protrusions as shown in
Referring to
Furthermore, in one embodiment of the present invention in, the round-shaped protrusion, linear protrusion, round-shaped slit or linear slit may also be disposed over the electrode film 208a of the opposite substrate in the gap between two adjacent radiation-shaped protrusions 230. It is noted that, the position of the linear protrusion, round-shaped slit or linear slit may be similar or same as that of the round-shaped protrusions 236 (as shown in
In addition, in the embodiment described above, the radiation-shaped protrusions 230 arranged in stripe may also be disposed over the electrode film 208 formed over the first substrate 200 as illustrated in the embodiment of the present invention shown in
Referring to
Furthermore, in one embodiment of the present invention in, the round-shaped protrusion, linear protrusion, round-shaped slit or linear slit may also be disposed over the electrode film 208 of the opposite substrate in the gap between two adjacent radiation-shaped protrusions 240. It is noted that, the position of the linear protrusion, round-shaped slit or linear slit may be similar or same as that of the round-shaped protrusions 236 (as shown in
In addition, in the embodiment described above, the radiation-shaped slits 240 may also be disposed over the electrode film 208a formed over the first substrate 200 in a manner described in the embodiment with reference to
Accordingly, because the radiation-shaped protrusions are being arranged in stripe or the radiation-shaped slits, therefore the liquid crystal molecules of the MVA LCD may have more tilt directions, and thus the tilt area may be more symmetric. Thus, the MVA LCD of the present invention may have full range of viewing angle.
The foregoing description of the embodiment of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
Number | Date | Country | Kind |
---|---|---|---|
93106430 | Mar 2004 | TW | national |