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Low-cost large-screen wide-angle fast-response liquid crystal display apparatus

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Title: Low-cost large-screen wide-angle fast-response liquid crystal display apparatus.
Abstract: A method of fabricating MVA active matrix substrate, and said substrate constituting an active matrix display device, characterized in that: a photolithographic procedure is performed three times for the manufacture: forming a gate electrode, a pixel electrode, a common electrode and a contact pad in said pixel electrode, forming a separate thin film semiconductor layer component, and a contact hole,forming a source electrode, a drain electrode and an orientation control electrode such that after an ohmic contact layer of a channel portion of said thin film transistor is dry etched, a partial film of a passivation layer is formed by a silicon nitride film by using a mask deposition method is provided. ...


Browse recent Mikuni Electoron Co. Ltd. patents - Ibaraki Prefecture, JP
Inventors: Sakae Tanaka, Toshiyuki Samejima
USPTO Applicaton #: #20120094416 - Class: 438 34 (USPTO) - 04/19/12 - Class 438 
Semiconductor Device Manufacturing: Process > Making Device Or Circuit Emissive Of Nonelectrical Signal >Making Emissive Array

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The Patent Description & Claims data below is from USPTO Patent Application 20120094416, Low-cost large-screen wide-angle fast-response liquid crystal display apparatus.

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RELATED APPLICATIONS

This application is a divisional application claiming priority to Ser. No. 12/558,086, filed on Sep. 11, 2009.

FIELD OF THE INVENTION

The present invention relates to a large-screen wide-angle liquid crystal display apparatus manufactured by using a halftone exposure method.

BACKGROUND OF THE INVENTION

In multi-domain vertical alignment (MVA) liquid crystal display apparatuses, an alignment control electrode for controlling an alignment of a liquid crystal molecule has been disclosed in Japan Laid Open Patents Nos. 07-230097, 11-109393 and 2001-042347.

SUMMARY

OF THE INVENTION

In view of the shortcomings of the prior art, the inventor of the present invention based on years of experience in the related industry conducting research and experiments, finally developed a large-screen wide-angle liquid crystal display apparatus in accordance with the present invention to overcome the foregoing shortcomings.

Therefore, it is a primary objective of the present invention to adopt a prior art alignment control electrode of a liquid crystal display (LCD) panel structure to correspond to smaller pixels. Because only one type of alignment control electrode is used, and the edge field effect of a pixel electrode is adopted, it is not applicable for lager pixels.

At present, the mainstream of multi-domain vertical alignment (MVA) liquid crystal display apparatus generally uses a bump or slit electrode for the alignment control of the sides of a color filter (CF) substrate, and this method can make a proper alignment if the pixel is large, but the cost of CF substrates is high, and becomes an obstacle for manufacturing a large-screen liquid crystal TV by a low cost.

Therefore, it is a primary objective of the present invention to reduce the number of photolithographic procedures of the transparent thin film transistor (TFT) active matrix substrate and the CF substrate during the manufacture of the TFT active matrix liquid crystal display apparatus in order to shorten the manufacturing procedure, lowering the manufacturing cost, and improving the yield rate.

The technical measures taken by the present invention are described as follows.

In Measure 1, unstable and swinging discrimination lines are avoided, and two types of alignment control electrodes are installed at an upper layer of a pixel electrode through an insulating film, and between common electrodes corresponding to the pixel electrodes. With the foregoing two different types of alignment control electrodes, the oblique direction of anisotropic liquid crystal molecules having a negative dielectric constant can be controlled precisely.

In Measure 2, one type of alignment control electrode is installed at an upper layer of a pixel electrode through an insulating film, and a slender slit is formed in the pixel electrode, and these two alignment control mechanisms can control the oblique direction of anisotropic liquid crystal molecules having a negative dielectric constant precisely.

In Measure 3, the alignment control electrodes as used in Measures 1 and 2 are connected to the pixel electrodes as close to the substrate as possible.

In Measure 4, the alignment control mechanisms as used in Measures 1 and 2 provide four perfect area alignments for a curvature of 90 degrees at a position proximate to the center of the pixel.

In Measure 5, a halftone exposure method is introduced into the manufacturing process of the TFT array substrate to reduce the number of photolithographic procedures.

In Measure 6, a basic unit pixel is divided into two sub pixels, and the common electrodes are installed parallelly on a video signal line, and the common electrodes of odd-numbered rows and even-numbered rows switch signals with different polarities in each scan period, and produce different voltages applied to the liquid crystal molecules of the two sub pixels.

With Measures 1 and 2, the TFT array substrate has all alignment control functions, and thus it is not necessary to form a pad or slit on the CF substrate for the alignment control, so that the MVA LCD panel can be manufactured with a low-cost CF substrate to lower the cost and improve the yield rate.

With Measure 3, the alignment control electrode connected to the pixel electrode is proximate to the substrate for enhancing the rotational torque of an electric field of anisotropic liquid crystal molecules having negative dielectric constant and acted at the vertical alignment, so as to achieve a high-speed response.

With Measure 4, unnecessary discrimination lines can be avoided to improve the overall light transmission rate of the screen and reduce unevenness of the LCD panel.

With Measures 1, 2 and 5, the processing costs for both CF substrate and TFT array substrate can be lowered, and thus the manufacturing cost of MVA LCD panels can be lowered significantly; the production efficiency can be improved, and the yield rate can be enhanced.

With Measures 5 and 6, the liquid crystal alignment control mechanism can be manufactured by a very simple manufacturing process, and the correction of γ curve can be achieved by a very simple circuit, and thus a little cost is incurred for enhancing the display quality of a MVA liquid crystal display apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a conventional MVA LCD panel;

FIG. 2 is a cross-sectional view of a conventional MVA LCD panel;

FIG. 3 is a cross-sectional view of a MVA LCD panel of the present invention;

FIG. 4 is a cross-sectional view of a MVA LCD panel of the present invention;

FIG. 5 is a schematic view of the principle of a MVA LCD panel of the present invention;

FIG. 6 is a schematic view of the principle of a MVA LCD panel of the present invention;

FIG. 7 is a schematic view of the principle of a MVA LCD panel of the present invention;

FIG. 8 is a cross-sectional view of a MVA LCD panel adopting a TFT matrix substrate in accordance with the present invention;

FIG. 9 is a cross-sectional view of a TFT array substrate used for a MVA LCD panel in accordance with the present invention;

FIG. 10 is a cross-sectional view of a TFT array substrate used for a MVA LCD panel in accordance with the present invention;

FIG. 11 is a cross-sectional view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 12 is a cross-sectional view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 13 is a cross-sectional view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 14 is a cross-sectional view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 15 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 16 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 17 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 18 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 19 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 20 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 21 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 22 is a planar view of a TFT array substrate used in a MVA LCD panel in accordance with the present invention;

FIG. 23 shows a circuit model of a TFT array substrate of field-order driven MVA LCD panel in accordance with the present invention;

FIG. 24 shows a relation between the brightness and the signal voltage applied to a MVA LCD panel as depicted in FIG. 23;

FIG. 25 shows a circuit model of a TFT array substrate that is divided into upper and lower field-order driven MVA LCD panels in accordance with the present invention;

FIG. 26 illustrates a field-order driving method that divides a screen into upper and lower sections and writes data from the center of the screen to the upper or lower section of the screen in accordance with the present invention;

FIG. 27 illustrates a field-order driving method that divides a screen into upper and lower sections and writes data from the upper or lower sections of the screen towards the center of the screen in accordance with the present invention;

FIG. 28 illustrates a field-order driving method that divides a screen into upper and lower sections and writes data from the center of the screen to the upper or lower section of the screen in accordance with the present invention;

FIG. 29 illustrates a field-order driving method that divides a screen into upper and lower sections and writes data from the upper or lower sections of the screen towards the center of the screen in accordance with the present invention;



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stats Patent Info
Application #
US 20120094416 A1
Publish Date
04/19/2012
Document #
13334287
File Date
12/22/2011
USPTO Class
438 34
Other USPTO Classes
257E33012
International Class
01L33/08
Drawings
43


Active Matrix Display


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