JP2004233434A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of uneven luminance in a non-display region when a distance between two transparent substrates is narrowed, or a backlight device high in luminance is used. <P>SOLUTION: A resin film 15 for shielding light and dummy patterns 18 and 19a, 19b... composed of a metal film for shielding the light are disposed in combination and in a stacked state on the non-display region of the transparent substrate 1. The dummy pattern 18 for shielding the light is formed with a plurality of wiring lines composed of the metal film so as to make its wiring density on the same level as that of signal lines S and is connected to an adjacent power source line 17 in a bundled state. The dummy patterns 19a, 19b... for shielding the light are formed by disposing each of the wiring lines composed of the metal film between each pair of the neighboring signal lines in a nondense region of the signal lines S1, S2... so as to make wiring density resulting from each of the dummy patterns 19 for shielding the light and each of the signal lines S on the same level as that of each of the signal lines S in a dense region. Each of the dummy patterns 19 for shielding the light is individually connected to the adjacent signal line S. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmissive display device having a display area on a transparent substrate and a non-display area around the display area.
[0002]
[Prior art]
2. Description of the Related Art In recent years, with the spread of display devices represented by liquid crystal display devices, demands for display quality have been increasing. Particularly in liquid crystal televisions, demands for high brightness, high contrast, and high-speed response are increasing. To satisfy these demands, the distance between two transparent substrates holding a liquid crystal layer is reduced, and a backlight device with high brightness is required. It may be necessary to design for use. For this reason, it is more important than ever before to block light from transmitting light from a backlight device in a portion where light should not be transmitted.
[0003]
In a conventional liquid crystal display device, a light-shielding film is formed in a non-display area other than a display area where pixels are arranged on a transparent substrate (see Patent Document 1). For example, in a display area on a transparent substrate, a wiring of a metal film originally required for a display operation such as a scanning line or a signal line also serves as a light shielding film, and in a peripheral non-display area, a wiring of a metal film thus shared is used. The light-shielding layer was formed of a black resin film.
[0004]
[Patent Document 1]
Japanese Patent No. 2776356
[Problems to be solved by the invention]
However, in the conventional non-display area light-shielding method, if the distance between the two transparent substrates is reduced, the thickness of the light-shielding resin film has to be reduced, and the light transmittance increases. Further, when a high-luminance backlight device is used, the black resin film alone does not sufficiently shield light, and light leakage occurs. For this reason, light leakage occurs remarkably in a portion where the wiring density of the metal film is low, which causes luminance unevenness in a non-display region.
[0006]
The present invention has been made in view of the above, and an object of the present invention is to reduce the distance between two transparent substrates, or to reduce the luminance unevenness in a non-display area even when a high-luminance backlight device is used. It is an object of the present invention to provide a liquid crystal display device capable of preventing the occurrence of the phenomenon.
[0007]
[Means for Solving the Problems]
The display device according to the first aspect of the present invention includes a light-shielding resin film formed in a non-display area that is an area other than a display area in which pixels on a transparent substrate are arranged, and the resin film overlapping the non-display area. And a light-shielding dummy pattern of a metal film connected to the original wiring for the display operation.
[0008]
In the present invention, a light-blocking resin film and a metal-blocking light-blocking dummy pattern are juxtaposed in a non-display area so as to overlap with each other, thereby reducing the light transmission area and preventing light leakage. In addition, by connecting the metal film forming the light-shielding dummy pattern to the original wiring for the display operation, it is possible to prevent the light-shielding dummy pattern from becoming a stray capacitance and adversely affecting the display operation. .
[0009]
According to a second aspect of the present invention, in the display device, the light-shielding dummy pattern is composed of a plurality of wirings made of the metal film, and a wiring density thereof is approximately equal to a density of the original wirings for the display operation. Features.
[0010]
In a third aspect of the present invention, in each of the display devices, the light-shielding dummy pattern is such that a wiring made of the metal film is provided between the wirings in a region where the original wiring for the display operation is sparse. The wiring density of the light-shielding dummy pattern and the original wiring for the display operation is substantially equal to the wiring density in a dense region of the original wiring for the display operation.
[0011]
According to the second and third aspects of the present invention, the wiring density of the light-shielding dummy pattern composed of a plurality of wirings of the metal film is made substantially equal to the original wiring density for the display operation, or the original wiring density for the display operation is reduced. If the wiring density in the region where the light-shielding dummy pattern, which is a wiring of a metal film between the wirings is formed, is approximately the same as the wiring density in the dense region of the original wiring for display operation, if light leakage occurs, Even in such a case, luminance unevenness is prevented.
[0012]
According to a fourth aspect of the present invention, in each of the above display devices, the original wiring for the display operation is a power supply line arranged near the light-shielding dummy pattern.
[0013]
In a fifth aspect of the present invention, in each of the above display devices, the original wiring for the display operation is a signal line or a scanning line arranged near the light-shielding dummy pattern.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
In this embodiment, a case where the display device of the present invention is applied to a liquid crystal display device as an example will be described.
[0015]
As shown in the plan view of FIG. 1, the present liquid crystal display device includes a display region 13 for displaying an image on a transparent substrate 1 made of glass and a non-display region other than the display region. In the non-display area, a black resin film 15 for light shielding is arranged, and a scanning line driving circuit 11 and a signal line driving circuit 12 are formed.
[0016]
The scanning lines Y1, Y2,... (Hereinafter, appropriately referred to as “Y”) from the scanning line driving circuit 11 and the signal lines S1, S2,. ) Are wired so as to intersect on the display area 13. A pixel 14 is arranged at each intersection of the scanning line Y and the signal line S. Thus, the plurality of pixels 14 are arranged in a matrix in the display area.
[0017]
The present liquid crystal display device is an active matrix type in which a switching element is arranged for each pixel 14. The switching element for each pixel 14 and the switching elements forming the scanning line driving circuit 11 and the signal line driving circuit 12 are formed by the same manufacturing process. Here, as an example, each switching element is a field-effect thin film transistor.
[0018]
As shown in the cross-sectional view of FIG. 2, a liquid crystal layer 3 is held in a gap between a transparent substrate 1 and a transparent substrate 2 made of glass disposed opposite thereto, and the periphery of the liquid crystal layer 3 is sealed by a sealing material 4. Is done. A plurality of pixel electrodes 16 corresponding to the respective pixels 14 are formed on the surface of the transparent substrate 1 on the side in contact with the liquid crystal layer 3, and a counter electrode 21 is formed on the surface of the transparent substrate 2 on the side in contact with the liquid crystal layer 3. . The backlight device is disposed on the back side of the transparent substrate 1 opposite to the side in contact with the liquid crystal layer 3.
[0019]
As shown in the enlarged plan view of FIG. 3, on the resin film 15 formed in the non-display area, a power supply line 17 and a signal line S are wired as original wirings for display operation, and a light-shielding dummy pattern of a metal film is formed. 18, light-shielding dummy patterns 19a, 19b,... (Hereinafter collectively referred to as "19" as appropriate) are formed on the resin film 15 and connected to the original wiring for the display operation.
[0020]
More specifically, the light-shielding dummy pattern 18 is formed of a plurality of wirings made of a metal film, and is formed such that the wiring density is substantially equal to the wiring density of the signal lines S. It is desirable that the wiring density is substantially equal to the wiring density in the dense region of the signal line S. The plurality of wirings made of the metal film are connected to a nearby power supply line 17 in a bundled state.
[0021]
The light-shielding dummy patterns 19a, 19b,... Are formed by providing a wiring made of a metal film between signal lines in a sparse region of the signal lines S1, S2,. The wiring density of the lines S is formed so as to be approximately the same as the wiring density in the dense region of each signal line S. The light-shielding dummy patterns 19a, 19b,... Are individually connected to the neighboring signal lines S1, S2,.
[0022]
Therefore, according to the present embodiment, the light-transmitting area can be reduced by providing the light-shielding resin film 15 and the light-shielding dummy patterns 18 and 19 of the metal film so as to overlap with each other in the non-display area on the transparent substrate 1. Since it is reduced, light leakage can be prevented. Accordingly, it is possible to provide a liquid crystal display device in which the gap between the transparent substrate 1 and the transparent substrate 2 is reduced or the occurrence of luminance unevenness in a non-display area is prevented even when a high-luminance backlight device is used.
[0023]
According to the present embodiment, the metal films forming the light-shielding dummy patterns 18 and 19 are connected to the power supply line 17 and the signal line S, which are the original wirings for the display operation, respectively. 19 can be prevented from becoming a floating capacitance and adversely affecting the display operation.
[0024]
According to the present embodiment, the wiring density of the light-blocking dummy pattern 18 is made substantially equal to the density of the signal line S, or the wiring density of the light-blocking dummy pattern 19 and the signal line S is reduced in the dense area of the signal line S. By making the density approximately the same, even if light leakage occurs, luminance unevenness can be prevented.
[0025]
Further, by further increasing the black color of the resin film 15, a further effect of preventing light leakage can be obtained.
[0026]
In this embodiment, the dummy patterns 19a, 19b,... For shielding light are connected to the signal lines S1, S2,. Are connected to the scanning lines Y1, Y2,... Respectively.
[0027]
The light-shielding resin film 15 may be formed not only in the non-display area on the transparent substrate 1 but also in the non-display area on the transparent substrate 2.
[0028]
【The invention's effect】
As described above, according to the display device of the present invention, even when the distance between two transparent substrates is reduced or a high-luminance backlight device is used, the occurrence of luminance unevenness in a non-display area is prevented. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating a configuration of a display device according to an embodiment.
FIG. 2 is a cross-sectional view illustrating a configuration of the display device.
FIG. 3 is an enlarged plan view showing a formation state of a light-shielding dummy pattern in a portion A of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Transparent substrate 3 ... Liquid crystal layer 4 ... Sealant 11 ... Scan line drive circuit 12 ... Signal line drive circuit 13 ... Display area 14 ... Pixel 15 ... Resin film 16 ... Pixel electrode 17 ... Power supply lines 18 and 19 ... Dummy pattern 21 for shielding light ... Counter electrode S ... Signal line Y ... Scanning line

Claims (5)

A light-shielding resin film formed in a non-display area that is an area other than the display area where the pixels on the transparent substrate are arranged,
A light-blocking dummy pattern of a metal film formed on the non-display area so as to overlap with the resin film and connected to an original wiring for a display operation;
A display device comprising: 2. The display device according to claim 1, wherein the light-shielding dummy pattern includes a plurality of wirings made of the metal film, and a wiring density thereof is substantially equal to a density of the original wirings for the display operation. In the light-shielding dummy pattern, the wiring made of the metal film is provided between the wirings in a region where the original wiring for the display operation is sparse, and the light-shielding dummy pattern and the original wiring for the display operation are provided. 3. The display device according to claim 1, wherein a wiring density of the display operation is substantially equal to a wiring density in a dense area of the original wiring for the display operation. 4. 4. The display device according to claim 1, wherein the original wiring for the display operation is a power supply line arranged near the light-shielding dummy pattern. 5. The display device according to claim 1, wherein the original wiring for the display operation is a signal line or a scanning line arranged near the light-shielding dummy pattern.

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