JPH05216021A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate the leakage light from a black matrix out of a display area, to prevent display quality from being deteriorated, and to visually confirm positional accuracy in sticking a polarizing plate. CONSTITUTION:A marker 6 for confirming the positional accuracy in sticking the polarizing plate 5 is provided outside the black matrix 4. Thus, the leakage light from the black matrix 4 out of the display area is eliminated, and the positional accuracy in sticking the polarizing plate is visually confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device which facilitates a polarizing plate attaching process.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been vigorously researched and developed as direct-view display devices, and are now widely used as displays for liquid crystal TVs, laptop personal computers and the like.

FIG. 7 shows a sectional view of the basic structure of a conventional color liquid crystal display device.

The glass substrate 2 provided with the R, G, B color filters 22, the protective film 23, the counter electrode 24, the liquid crystal alignment film 25, and the other glass substrate provided with the thin film transistor (TFT) and the liquid crystal alignment film 25 ( TFT substrate) 26,
It has a structure in which a spacer such as a cell thickness adjusting glass fiber is bonded to the spacer through an epoxy adhesive layer 27 and the like, and liquid crystal 28 is filled in the gap between the substrates. Polarizing plates 5 were attached to the front and back of the panel so that the display area of this panel was evenly covered vertically and horizontally.

FIG. 6 is a plan view showing a conventional liquid crystal display device. A notch 6'was made in order to overlap the polarizing plate 5 on the counter substrate 2 and the TFT substrate 3.

[0006]

In the conventional liquid crystal display device, as shown in FIG. 6, the position accuracy confirmation after the polarizing plate is attached is cut into a part of the chrome film for the black matrix on the color filter side to form a cut 6 '. It was put in (if the marker does not cover the polarizing plate), or measured with a spot size gauge or the like with reference to the display section or the like.

However, when a notch is made in a part of the chromium film for the black matrix, there is a problem that light from the backlight leaks and the display quality is deteriorated, and it takes time to measure with a gauge.

[0008]

According to the present invention, in a liquid crystal display device having a structure in which a liquid crystal is sandwiched between two substrates having electrodes, one main surface of at least one of the two substrates is provided. Thus, a liquid crystal display device having a marker for confirming the positional accuracy when the black matrix and the polarizing plate are attached can be obtained.

Further, according to the present invention, there can be obtained a liquid crystal display device in which the position accuracy confirmation marker is made of chrome.

Further, according to the present invention, of the above-mentioned two substrates, a black matrix, a position accuracy confirmation marker, a color filter and a counter electrode are provided on one main surface of the first substrate, and the black matrix is provided. The matrix, the color filter, the position accuracy confirmation marker, and the first liquid crystal alignment film on the counter electrode, and the first position accuracy confirmation marker is provided on the other main surface of the first substrate. A polarizing plate is provided, a thin film transistor is provided on one main surface of the second substrate, a second liquid crystal alignment film is provided on the thin film transistor, and a position accuracy confirmation marker is provided on the other main surface of the second substrate. A liquid crystal display device is obtained which has the second polarizing plate whose position accuracy has been confirmed in (1) and holds the liquid crystal between the first alignment film and the second alignment film.

Further, according to the present invention, in a liquid crystal display device having a structure in which a liquid crystal is sandwiched between two substrates having electrodes,
A black matrix is provided on one of the two substrates, and at least one of the vertices of the black matrix is
It is possible to obtain a liquid crystal display device in which one vertex and the vertex of the polarizing plate overlap with each other when viewed through the substrate.

[0012]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 is a plan view showing a first embodiment of the present invention, and FIG. 2 is a sectional view thereof. 1 mm x 0.5 mm on the outside and four edges of the black matrix 4 on the color filter side
A polarizing plate attachment position confirmation marker 6 having the shape of is formed of a chrome film.

The sticking position of the polarizing plate 5 can be confirmed by visually confirming that the end of the polarizing plate 5 is within the range of the marker 6. Also, the conventional black matrix 4
When the cutouts were provided at the four edges, 100% of the light leaked from the backlight was generated, but with the structure of the present invention, no light leaked from the backlight was generated.

FIG. 3 is a plan view showing a second embodiment of the present invention. The difference from the first embodiment is the shape of the marker, and in addition to this, it is possible to attach markers in the shape of points, circles, polygons, lines, and the like.

FIG. 4 is a plan view showing a third embodiment of the present invention. Since the polarizing plate is placed at the position of the marker, there is an advantage that the number of markers can be small.

FIG. 5 is a plan view showing a fourth embodiment of the present invention. By making the shapes of the polarizing plate and the black matrix the same, it becomes possible to align the vertices of the polarizing plate with the vertices of the black matrix. This is effective because alignment can be performed without attaching a marker.

[0018]

As described above, according to the present invention, there is no light leakage of the backlight from the black matrix,
In addition, since it can be visually checked, it has the effect of improving productivity.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of a liquid crystal display device according to the present invention.

FIG. 3 is a plan view showing a second embodiment of the liquid crystal display device according to the present invention.

FIG. 4 is a plan view showing a third embodiment of the liquid crystal display device according to the present invention.

FIG. 5 is a plan view showing a fourth embodiment of the liquid crystal display device according to the present invention.

FIG. 6 is a plan view showing a conventional liquid crystal display device.

FIG. 7 is a cross-sectional view showing a conventional liquid crystal display device.

[Explanation of symbols]

 1 TFT Substrate 2 Counter Substrate 3 Seal 4 Black Matrix 5 Polarizing Plate 6 Marker for Confirming Positioning Accuracy of Polarizing Plate 6'Notch for Confirming Positioning Accuracy of Polarizing Plate 22 Color Filter 23 Protective Film 24 Counter Electrode 25 Liquid Crystal Alignment Film 27 Adhesive Layer 28 liquid crystal

Claims (4)

[Claims] 1. A liquid crystal display device having a structure in which a liquid crystal is sandwiched between two substrates having electrodes, and a black matrix and a polarizing plate are attached to one main surface of at least one of the two substrates. A liquid crystal display device having a marker for confirming position accuracy in the case. 2. The liquid crystal display device according to claim 1, wherein the position accuracy confirmation marker is made of chromium. 3. The black matrix, the color filter having the black matrix, the position accuracy confirmation marker, a color filter and a counter electrode on one main surface of the first substrate of the two substrates. A first polarization having a position accuracy confirmation marker and a first liquid crystal alignment film on the counter electrode, and the position accuracy confirmed by the position accuracy confirmation marker on the other main surface of the first substrate. A plate, a thin film transistor on one main surface of the second substrate of the two substrates, a second liquid crystal alignment film on the thin film transistor, and another main substrate of the second substrate. A second polarizing plate whose position accuracy is confirmed by the position accuracy confirmation marker on the surface, and liquid crystal is sandwiched between the first alignment film and the second alignment film. The liquid crystal display device according to claim 1. 4. A liquid crystal display device having a structure in which a liquid crystal is sandwiched between two substrates having electrodes, wherein a black matrix is provided on one of the two substrates, and one of the apexes of the black matrix is A liquid crystal display device, wherein at least one apex and the apex of the polarizing plate are overlapped at the same position when seen through the substrate.