JP2000352714A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart uniform alignment to a liquid crystal up to the end part of a liquid crystal display device and to maintain uniform display characteristics all over the screen by forming a dummy part outside a display part and forming a laminated body consisting of an electrode at the same surface level as that of the display part, dummy color filters and an alignment controlling film. SOLUTION: The right three pixel electrodes 4 in the figure are used as dummy pixels, and the TFT element connected to each pixel electrode is in contact with the scanning line and display line, but the scanning line or display line is not connected to the driving circuit so that only the dummy pixels are electrically insulated. The right three color filters 27 facing the above-mentioned electrodes are used as dummy color filters. A light-shielding part disposed to completely cover the dummy color filters is formed wider than the dummy part, and the opening of the light-shielding part forms the display part. By surrounding the display part with the dummy part, same alignment property can be obtd. in the both ends of the screen as that of the center region, and therefore, a sharper image can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device for displaying images and the like.

[0002]

2. Description of the Related Art In recent years, the characteristics required for a liquid crystal display device have become more severe, and the image quality is required to be at the same level as that of a normal CRT screen. In a liquid crystal display device, controlling the orientation of the used liquid crystal is a major factor that affects the quality of a display image, and it is necessary to uniformly orient the liquid crystal in any part of the display unit. Generally, an alignment control film is provided on a liquid crystal surface to control the alignment of the liquid crystal.

[0003]

When there is a step on the surface of the alignment control film, the orientation of the liquid crystal changes at the step and becomes non-uniform. When color display is performed by a liquid crystal display device, any one of red (R), green (G), and blue (B) color filters is attached to the substrate on the counter electrode side for each pixel. Has a step because there is no adjacent filter.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a liquid crystal display device in which uniform orientation is imparted to the liquid crystal up to the end and the display characteristics of the entire screen are kept uniform.

That is, the present invention comprises an electrode substrate provided with an electrode and a switching element, an opposing electrode disposed at a distance from the electrode substrate, opposing the electrode, a color filter, and an orientation control film. A liquid crystal display device having a liquid crystal arranged at the interval, a display unit having the electrodes disposed thereon, and a non-display dummy unit disposed outside the display unit. Has a laminated body of an electrode having substantially the same level as the counter electrode of the display section, a dummy color filter, and an alignment control film in the dummy section, and is disposed so as to completely cover the dummy color filter. A liquid crystal display device comprising a liquid crystal display device.

In the present invention, a dummy portion is provided outside the display portion, and a laminated body composed of an electrode having the same level difference as the display portion, a dummy color filter, and an orientation control film is provided. The conditions are applied to keep the alignment of the liquid crystal uniform.

In the present invention, the dummy portion may be formed at a necessary portion on the left and right around the display portion, and its area is preferably about five scanning lines or display lines.

In the present invention, preferably, the dummy section has the same structure as the display section, that is, forms a dummy pixel having a wiring, a switching element, a pixel electrode and the like, and each pixel electrode is electrically connected so that no voltage is applied. Keep it insulated. When the same step shape is formed by forming the dummy pixels in this way, the manufacturing process of each pixel of the display section may be expanded as it is, and the manufacturing is easy because an extra process is unnecessary.

The electrically insulated state is not particularly limited, and may be appropriately selected according to the manufacturing process. For example, in the case where the switching element is a transistor, the switching element can be insulated by leaving no contact with the scanning line and the display line. In addition, if the wiring is partially disconnected or the end is not connected to the drive circuit, the wiring is kept in an insulated state.

Further, by providing a light shielding portion in the same region as the dummy portion, the dummy portion is completely blackened and the screen is tightened. Furthermore, the boundary end surface between the dummy part and the display part is provided below the light-shielding part, and the display part is defined by the opening of the light-shielding part, so that the alignment of the dummy part is facilitated, and a reduction in yield due to poor alignment is prevented. can do.

Although the specific structure of the present invention will be described in detail in an embodiment described later, the present invention can be applied not only to the active matrix system of the embodiment.

[0012]

EXAMPLES The present invention will be described below in more detail with reference to Examples, but it should not be construed that the present invention is limited thereto.

Reference Example 1 FIG. 1 shows an electrode substrate (TFT substrate) that can be used in the present invention. In the figure, 1 is a display line, 2 is a scanning line, 3 is a TFT (thin film transistor) element, 4 is a pixel electrode, 5 is a horizontal shift register, 6 is a vertical shift register, a row indicated by 7 and a column indicated by 7 '. The portion indicated by the dummy pixels, 8 × 8 ′, is the display section. Each dummy pixel is electrically insulated without contacting the gate or source of the TFT element 3 with the scanning line 2 or the display line 1. This embodiment is an example in which a TFT is used as a switching element, and three display lines and three scanning lines are dummy pixels.

Reference Example 2 FIG. 2 shows a second reference example of the present invention. FIG. 2 shows an end of the apparatus of the present embodiment. In the figure, 21 is a TFT substrate, 22 to 22 ″
Is an insulating layer, 23 and 23 'are alignment control films, 24 is a liquid crystal,
5 is a sealing material, 26 is a counter electrode, 27 is a color filter, 28 is a polarizing plate, and 29 is a parting plate.

In this figure, the right three pixel electrodes 4 are dummy pixels and a TFT element (not shown) connected to each pixel electrode is in contact with a scanning line and a display line.
The scanning lines or the display lines are not connected to the driving circuit, and only the dummy pixels are electrically insulated. On the other hand, the corresponding three color filters 27 on the right are dummy color filters. In this way, by surrounding the periphery of the display section with the dummy section, the same orientation as that of the center section can be obtained also at the end of the screen.

Embodiment 1 FIG. 3 shows an embodiment of the present invention. In this embodiment, a light-shielding portion is further added to the configuration of the reference example 2. As shown in FIG. 3, the light-shielding portion 31 is wider than the dummy portion 32, and the display portion 33 is formed with the opening. ing. The insulating state of the dummy part is the same as that of the reference example 2. With this configuration,
The surroundings of the screen are completely black, and a tighter image is displayed.

[0017]

As described above, in the liquid crystal display device of the present invention, since the dummy portion is formed around the display portion, the orientation of the liquid crystal is uniformly controlled to the edge of the screen, and a high quality image is displayed. Can be displayed evenly on the entire screen.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first reference example of the present invention.

FIG. 2 is a diagram showing a second reference example of the present invention.

FIG. 3 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display line 2 Scanning line 3 TFT element 4 Pixel electrode 5 Horizontal shift register 6 Vertical shift register 7, 7 'Dummy pixel 8, 8' Display part 21 TFT substrate 22-22 "Insulating layer 23, 23 'Alignment control film 24 Liquid crystal Reference Signs List 25 sealing material 26 counter electrode 27 color filter 28, 28 'polarizing plate 29 parting plate 31 light shielding part 32 dummy part 33 display part

Continued on the front page. (72) Katsuhisa Ogawa, 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Akira Ishizaki 3-30-2, Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Mamoru Miyawaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (2)

[Claims] An electrode substrate provided with electrodes and switching elements, a counter electrode disposed at a distance from the electrode substrate, and provided with a counter electrode, a color filter, and an alignment control film disposed opposite to the electrode. And a liquid crystal display device having a liquid crystal arranged at the interval, a display portion having the electrodes disposed thereon, and a non-display dummy portion disposed outside the display portion, wherein the opposing substrate is the dummy In the unit, an electrode having substantially the same step as the counter electrode of the display unit, a dummy color filter, and a laminate of an orientation control film,
A liquid crystal display device comprising a light-shielding portion disposed so as to completely cover the dummy color filter. 2. The liquid crystal display device according to claim 1, wherein the light shielding portion is wider than the dummy portion, and a display portion is defined by an opening of the light shielding portion.