JPH10123498A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a futile use in constitution as much as possible and to reduce a cost by sticking a light shield tape to a position answering to an outer periphery of a display area oppositely arranging two sheets of substrates parallel to each other at a prescribed interval. SOLUTION: An active matrix liquid crystal display device is constituted so that two sheets of substrates 9, 10 are oppositely arranged parallel to each other through the prescribed interval, and space surrounding the display area 13 in this interval is formed by a seal member 11, and a liquid crystal is enclosed in this space, and polarizing plates are attached to the outer surfaces of both substrates 9, 10. Then, the light shield tape 27 is stuck onto the outer surface of the active matrix substrate 9 answering to the outer periphery of the display area 13 surrounded by the seal member 11 without forming a light shield film (black matrix) as usual. This light shield tape 27 is overlapped respectively with the polarizing plates between at a draw-out terminal side of a gate bus line 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a panel-type display device. As this display device, for example, an active matrix type or a simple matrix type liquid crystal display device (L
CD), plasma display (PDP), electroluminescence (EL), and the like.

[0002]

2. Description of the Related Art For example, an active matrix type liquid crystal display device has a structure in which two substrates are arranged to face each other in parallel with a required gap therebetween, and a liquid crystal is sealed in the gap. One of the two substrates is called an active matrix substrate, and the other is called a counter substrate.

A gate bus line, a source bus line, a pixel electrode, a switching element and the like are provided on the active matrix substrate. A common electrode facing all the pixel electrodes is provided on a counter substrate. A light-shielding film (a so-called black matrix) made of chromium, chromium oxide, or the like is provided in order to prevent light leakage from the separated region of the pixel electrode and the outer periphery of the display region including the entire pixel electrode. The opposing substrate is also provided with a three-color filter of RGB or YMC as necessary.

In general, the above-described display device is installed in a device to be used in a state where a polarizing plate is attached to both sides of two substrates and a backlight or the like is provided on one side. A cushioning material for absorbing vibration and shock is arranged between the polarizers.

[0005]

In the above-mentioned conventional display device, it is required to simplify the configuration from various viewpoints in order to reduce costs. On the other hand, the applicant of the present application has found that there is room for improvement with respect to the light-shielding film and the cushioning material other than the main components in the display device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the cost of a display device by minimizing structural waste.

[0007]

According to a first display device of the present invention, two substrates are arranged in parallel and opposed to each other with a required gap, and a light-shielding tape is provided at a portion corresponding to the outer periphery of the display area. It is stuck.

A second display device according to the present invention comprises two substrates arranged in parallel and opposed to each other with a required gap therebetween, and liquid crystal sealed in the gap. Light is shielded at a portion corresponding to the periphery of the display area. Tape is stuck.

In a third display device according to the present invention, two substrates are arranged in parallel and opposed to each other with a required gap therebetween, and a liquid crystal is sealed in the gap. The switching elements are respectively provided in the vicinity of the intersection of these two wirings, and the surface which becomes uneven by the wirings and the switching elements is entirely covered with the planarization insulating film. Pixel electrodes are provided in a matrix, and the separated area of each pixel electrode and the two types of wirings are overlapped, and corresponding to the outer periphery of the display area surrounding each of the pixel electrodes, on one of the outer surfaces of the substrate. Light shielding tape is stuck.

In a fourth display device according to the present invention, two substrates are arranged to face each other in parallel with a required gap therebetween, and liquid crystal is sealed in the gap. The switching elements are respectively provided in the vicinity of the intersection of these two wirings, and the surface which becomes uneven by the wirings and the switching elements is entirely covered with the planarization insulating film. Pixel electrodes are provided in a matrix, the separated region of each pixel electrode and the two types of wiring are overlapped, and a spare wiring is provided on the outer periphery of a display region surrounding each of the pixel electrodes. A light-shielding tape is attached to the outer surface of one of the substrates corresponding to the area including the spare wiring on the outer periphery of the area.

The above-mentioned light-shielding tape is preferably attached to the outer surface of the substrate on the light emission side. Further, the light-shielding tape may be elastic or have conductivity.

In short, in the present invention, instead of forming a conventional light-shielding film (black matrix), the light-shielding tape is applied. As a result, the operation is greatly simplified, and the number of manufacturing steps and material costs can be reduced.

Further, if the light-shielding tape is attached to the outer surface of the substrate on the light emission side, it is possible to prevent leakage due to the wraparound of transmitted light.

Further, if the light-shielding tape has elasticity, it is possible to eliminate the conventional cushioning material. Furthermore, if the light-shielding tape is made conductive, so-called EMI countermeasures, such as absorption and reduction of electromagnetic radiation from a drive circuit connected to the lead-out terminal, can be achieved.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A description will be given based on the embodiment shown in FIG. Here, an example in which the present invention is applied to an active matrix liquid crystal display device will be described.

FIGS. 1 to 8 relate to an embodiment of the present invention. FIG. 1 is a circuit diagram of an active matrix type liquid crystal display device, FIG. 2 is a plan view of the same device, and FIG. FIG. 4 is a sectional view taken along line (3)-(3) of FIG.
FIG. 5 is a plan view showing one pixel of the active matrix substrate, and FIG. 6 is a view (6)-of FIG.
(6) Arrow view of a line cross section, FIG. 7 is (7)-(7) of FIG.
FIG. 8 is a plan view showing the relationship among the lead terminals of the source bus line, the spare wiring, and the light-shielding tape in FIG.

The active matrix type liquid crystal display device is configured as shown in the circuit diagram of FIG. 1, wherein 1 is a gate bus line as a plurality of scanning lines arranged in a row direction, and 2 is arranged in a column direction. Source bus lines 3 serving as a plurality of signal lines are a plurality of pixels provided in a matrix area formed by orthogonal intersections of the bus lines 1 and 2. The pixel 3 is mainly composed of a pixel electrode 4 and a switching element 5 such as a TFT, but has a configuration in which an auxiliary capacitance 6 is additionally provided here. Reference numeral 7 denotes an auxiliary capacitance bus line, and reference numeral 8 denotes a common electrode.

In this active matrix type liquid crystal display device, as shown in FIGS. 2 to 4, two substrates 9 and 10 are arranged in parallel to face each other with a required gap therebetween. The space surrounding the sealing member 11
The liquid crystal 12 is sealed in this space, and the polarizing plates 14a and 14b are attached to the outer surfaces of the substrates 9 and 10.

The above-mentioned one substrate 9 is called an active matrix substrate, and the other substrate 10 is called a counter substrate. The active matrix substrate 9 has a gate bus line 1 as shown in FIGS. , The source bus line 2, the pixel 3, and the common electrode 8 (not shown) are provided separately on the counter substrate 10 side.

As shown in FIGS. 5 to 7, the switching element 5 has a so-called inverted staggered structure, and its components include a gate electrode 15 and a gate insulating film 1.
6, a semiconductor layer 17, a channel protection layer 18, ohmic contact layers 19 and 20, a source electrode 21, and a drain electrode 22. The gate bus line 1 is connected to the gate electrode 15, the source bus line 2 is connected to the source electrode 21, and the pixel electrode 4 is connected to the drain electrode 22 via a contact hole 24 provided in the planarizing insulating film 23. Connected.

The auxiliary capacitance 6 is composed of three layers: the drain electrode 22, the gate insulating film 16, and the conductive film 25 for the auxiliary capacitance. Note that the auxiliary capacitance 6 here has a structure called a Cs-on-Common, which is formed by overlapping the auxiliary conductive film 25 and the drain electrode 22.

As described above, in the active matrix substrate 9 in the illustrated example, the uneven surface of the gate bus line 1, the source bus line 2, and the switching element 5 is flattened by the flattening insulating film 23, and the flat surface is formed. By forming the pixel electrodes 4 in a matrix, a high aperture ratio and high definition are achieved.

This embodiment is characterized in that the sealing member 11 is formed without forming a light-shielding film (black matrix) as in the prior art.
The light-shielding tape 27 is attached to the outer surface of the active matrix substrate 9 corresponding to the outer periphery of the display area 13 surrounded by. This light shielding tape 27 is shown in FIGS.
As shown in FIG. 5, the polarizers 14 are provided on the lead terminal side of the gate bus line 1 and the lead terminal side of the source bus line 2 respectively.
a. However, the light-shielding tape 27 may not be placed on the polarizing plate 14a, and may be set to any state as needed. On the lead terminal side of the source bus line 2, as shown in FIG. 8, a spare wiring 28 parallel to the gate bus line 1 is provided. It is located so as to cover the wiring 28.

The above-mentioned light-shielding tape 27 preferably has a transmittance of 0.1% or less and has chemical resistance and heat resistance, and examples thereof include a metal foil and a light-shielding polyester tape. In order to reduce the thickness, 50
μmt or less is desirable.

By the way, as shown in FIG. 2, the reason why the light-shielding tape 27 is adhered only to the outer periphery of the display area 13 is that the structure shown in FIGS. This is because the gate bus line 1 and the source bus line 2 overlap with the separated portion, and light leakage is blocked by these.

As described above, in the liquid crystal display device of the present embodiment, since the conventional light shielding film (black matrix) is eliminated, a complicated and precise manufacturing process for forming the light shielding film can be omitted at all. become. Here, when comparing the conventional manufacturing process for forming the light-shielding film with the sticking process of the light-shielding tape 27, the sticking process of the light-shielding tape 27 can reduce the cost by about several hundredths. Becomes

The presence of the light-shielding tape 27 has the following effects. That is, in general, when a liquid crystal display device is incorporated in a device to be used, a polarizing plate 14a attached to the active matrix substrate 9 and a backlight (not shown) are overlapped. However, if the light-shielding tape 27 is adhered to the polarizing plates 14a and 14b of the substrates 9 and 10 so as to overlap with each other, the light-shielding tape 27 becomes a spacer that eliminates the gap due to the above-described error. Foreign matter such as dust can be reliably prevented from
Advantages such as a reduction in visibility due to foreign matter can be avoided.

In addition, for example, the light-shielding film (black matrix) described in the prior art
There is also an example in which it is formed on the side. In this case, there is a possibility that a short-circuit defect between the gate bus lines 1 may occur. In the case of this embodiment, however, such an occurrence of a structural defect may occur. Can be reliably avoided, which is advantageous in that the yield rate is improved.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

(1) In the above embodiment, the light shielding tape 27
Is adhered to the outer surface of the active matrix substrate 9. For example, as shown in FIGS.
0 may be adhered to the outer surface. This may be arbitrarily selected depending on which side of the liquid crystal display device emits light. In particular, it is better to attach the light-shielding tape 27 to the outer surface of the light-emitting substrate.
This is effective in obtaining high visibility, for example, by eliminating leakage due to the wraparound of the light whose transmission is blocked by 7.

(2) Display area 13 as in the above embodiment
In addition to sticking the light shielding tape 27 only on the outer circumference of
For example, as shown in FIG. 11, the light-shielding film 29 is disposed between the adjacent lead terminals on the lead terminal side of the plurality of source bus lines 2.
Can be formed. In this case, the bonding area of the light-shielding tape 27 can be made smaller than in the above-described embodiment, so that it is possible to further contribute to cost reduction and to simplify the work such as reducing the bonding accuracy. Incidentally, the light-shielding film 29 can be formed simultaneously with the auxiliary wiring 28 only by changing the mask pattern at the time of forming the auxiliary wiring 28, so that the number of steps does not need to be increased, and therefore, the same as in the above embodiment. Functions and effects can be obtained. Note that the spare wiring 28 is formed simultaneously with the gate electrode 15 and the gate bus line 1.

(3) In the above embodiment, the light shielding tape 27
Is basically used for light shielding, but may have elasticity. In order to impart elasticity, for example, the material of the light shielding tape 27 is made of silicon rubber or the like,
Alternatively, the film thickness may be set relatively thick, for example, about 1 mmt. In the case where the display device has elasticity as described above, even when vibration or impact is applied in a state where the display device is mounted on a device to be used, the display device also functions as a cushion material for absorbing the vibration or impact. Therefore, in this case, it is possible to eliminate a cushion material between the backlight and the backlight which has been conventionally required, and to contribute to further cost reduction.

(4) Further, the light-shielding tape 27 may have conductivity. In order to impart conductivity, for example, it is conceivable to mix carbon or the like into the adhesive. In the case of having conductivity in this way, so-called EMI countermeasures are possible, such as absorption and reduction of electromagnetic radiation from a drive circuit (not shown) connected to the lead terminals of the gate bus line 1 and the source bus line 2. Become. It is more effective if the light shielding tape 27 is grounded.

(5) In the above embodiment, an active matrix type liquid crystal display device is taken as an example of a display device, but a simple matrix type liquid crystal display device (LC
D), plasma display (PDP), electro-
The present invention can be applied to luminescence (EL) and the like in the same manner as in the above embodiment.

[0035]

According to the present invention, instead of the conventional light shielding film,
Using a light-shielding tape, it can be easily processed by the simple work of attaching it, so the number of manufacturing steps and material costs can be reduced, contributing to improved productivity and reduced product prices. .

If a light-shielding tape is adhered to the outer surface of the light-emitting side substrate, it is effective in obtaining high visibility, for example, it is possible to prevent leakage due to wraparound of transmitted light.

Furthermore, if the light-shielding tape has elasticity, it is possible to eliminate the conventional cushion material. Furthermore, if the light-shielding tape is made conductive, so-called EMI countermeasures, such as absorption and reduction of electromagnetic radiation from a drive circuit connected to the lead-out terminal, can be achieved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an active matrix type liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus.

3 is a sectional view taken along line (3)-(3) of FIG.

FIG. 4 is an arrow view of a cross section taken along line (4)-(4) in FIG. 2;

FIG. 5 is a plan view showing one pixel of an active matrix substrate.

6 is a sectional view taken along line (6)-(6) of FIG.

7 is a sectional view taken along line (7)-(7) of FIG.

FIG. 8 is a plan view showing the relationship between a lead terminal, a spare wiring, and a light shielding tape of the source bus line of FIG. 4;

FIG. 9 is a view corresponding to FIG. 3 in another embodiment of the present invention.

10 is a diagram corresponding to FIG. 4 in the embodiment of FIG. 9;

FIG. 11 is a view corresponding to FIG. 8 according to still another embodiment of the present invention.

[Explanation of symbols]

 9 Active matrix substrate 10 Counter substrate 13 Display area 27 Light shielding tape

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Mikio Katayama Inventor Sharp Corporation 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka

Claims (7)

[Claims] 1. A panel-type display device in which two substrates are arranged in parallel to each other with a required gap therebetween, and a light-shielding tape is adhered to a portion corresponding to an outer periphery of a display area. Characteristic display device. 2. A panel-type display device in which two substrates are arranged in parallel to each other with a required gap therebetween, and a liquid crystal is sealed in the gap. A light-shielding tape is provided at a portion corresponding to a peripheral edge of a display area. A display device, which is attached. 3. A panel display device in which two substrates are arranged in parallel to each other with a required gap therebetween, and a liquid crystal is sealed in the gap. On the other hand, two kinds of wirings are arranged in a grid on the substrate. A switching element is provided in the vicinity of the intersection of these two wirings, and the surface that becomes uneven by the wiring and the switching element is entirely covered with a planarizing insulating film, and a number of pixel electrodes are formed on the planarizing insulating film. Are provided in a matrix, and the separated area of each pixel electrode and the two types of wiring are overlapped. A light-shielding tape is provided on an outer surface of one of the substrates corresponding to an outer periphery of a display area surrounding each of the pixel electrodes. A display device, wherein is attached. 4. A panel-type display device in which two substrates are arranged in parallel to each other with a required gap therebetween, and a liquid crystal is sealed in the gap. On the other hand, two kinds of wirings are arranged in a grid on the substrate. A switching element is provided in the vicinity of the intersection of these two wirings, and the surface that becomes uneven by the wiring and the switching element is entirely covered with a planarizing insulating film, and a number of pixel electrodes are formed on the planarizing insulating film. Are provided in a matrix, the separated area of each pixel electrode and the two types of wiring are overlapped, and further, a spare wiring is provided on the outer periphery of a display area surrounding each of the pixel electrodes. Corresponding to the area including the spare wiring on the outer circumference,
A display device, wherein a light-shielding tape is attached to an outer surface of one of the substrates. 5. The display device according to claim 1, wherein the light-shielding tape is attached to an outer surface of a light emitting side substrate. 6. The light-shielding tape has elasticity.
The display device according to claim 1. 7. The display device according to claim 1, wherein the light-shielding tape has conductivity.