JPH1026758A - Surface light emitting lamp and liquid crystal display device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a transparent electrode layer from being conducted to a conductor member even when an end face comes into contact with the conduc tor member by forming a specified cutting line at the peripheral part of a base sheet. SOLUTION: At the peripheral part of the base sheet 40, the cutting line 47 is formed in depth to reach a base layer 41 from a 1st electrode layer 42 by leaving a terminal connection part 42a. It is formed to prevent a situation that the end face of the layer 42 out of the end faces of the sheet 40 comes into contact with the inner surface of the peripheral side plate of a shield frame and the layer 42 is short-circuited to a ground side, and the peripheral part of the sheet 40 is what is called half cut by leaving the terminal connection part 42a. Thus, a situation that the surface light emitting lamp 3 gets dark or it does not emit light because of short circuit is prevented. Then, component parts including the conductor member are intensively arranged, so that the device itself is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-emitting lamp used as, for example, a backlight of a liquid crystal display and a liquid crystal display having the same.

[0002]

2. Description of the Related Art In a liquid crystal display of this type, a surface-emitting lamp (electroluminescence lamp) is used as a backlight of a liquid crystal panel, and a liquid crystal display is used to shield electromagnetic wave noise generated on a circuit board and the like. A shield member of a metal frame is incorporated so as to border the panel, the surface-emitting lamp, and the circuit board. This shield member has a side plate extending from the edge of the liquid crystal panel toward the circuit board, and sandwiching the liquid crystal panel and the surface-emitting lamp between the side plate and the circuit board. In this case, the respective end faces are in contact with the inside of the peripheral side plate of the shield member so that the liquid crystal panel and the surface-emitting lamp do not move. On the other hand, a surface-emitting lamp is formed by patterning a surface light emitter or the like on a surface on the transparent electrode layer side of a base sheet in which a transparent electrode layer is laminated on the back surface of a transparent base layer, and then including the surface light emitter. It is formed by cutting with a cut-out type cutter.

[0003]

In such a conventional surface-emitting lamp, a base sheet in which a transparent electrode layer is laminated on a base layer is formed by simply cutting with a cutter.
When this is assembled as a surface-emitting lamp on the back side of the liquid crystal panel, the end face of the base layer and the end face of the transparent electrode layer come into contact with the inside of the peripheral side plate of the shield member. For this reason, the transparent electrode layer and the shield member are short-circuited, and the electric potential is lowered, so that the surface light emitter does not emit light or the illuminance is reduced. In particular, in this type of surface-emitting lamp, since a high-voltage AC power supply is applied, a decrease in function due to a short circuit becomes remarkable.

[0004] This means that not only the shield member but also other components may cause a short circuit if they come into contact with the end surface of the base sheet. Also, in the performance test of the surface-emitting lamp itself, if a person's hand touches the end face of the surface-emitting lamp, the person and the transparent electrode layer are connected to each other, and the capacitance measurement is disturbed, or the person is grounded. There was a short circuit.

It is an object of the present invention to provide a surface-emitting lamp in which the transparent electrode layer does not conduct to the conductive member even when the end face contacts the conductive member or the like, and a liquid crystal display device and a lighting device provided with the same. For that purpose.

[0006]

According to a first aspect of the present invention, there is provided a surface-emitting lamp, comprising: a base sheet having a transparent electrode layer laminated on a back surface of a transparent base layer; In a surface-emitting lamp formed by cutting into a size including a luminous body, a cut line is formed in a peripheral portion of the base sheet at a depth reaching the base layer from the transparent electrode layer.

According to this structure, a cut line is made in the peripheral portion of the base sheet at a depth reaching the base layer from the transparent electrode layer, so that the peripheral portion of the transparent electrode layer and the main body at the center except for the terminal connection portion are formed. The part is cut open by a score line and physically and electrically separated. For this reason, the peripheral portion and the main portion are in a non-conductive state mutually, and even if the end surface of the base sheet may come into contact with a conductive member or the like, only the peripheral portion of the transparent electrode layer comes into contact with the main portion. There is no short circuit to the member.

According to a second aspect of the present invention, there is provided a surface-emitting lamp in which a surface luminous body is laminated on a transparent electrode layer side surface of a base sheet in which a transparent electrode layer is laminated on a back surface of a transparent base layer, and the surface luminous body is included. In a surface-emitting lamp formed by cutting into pieces, a peripheral portion of the transparent electrode layer is removed by etching.

According to this structure, the peripheral portion of the transparent electrode layer is removed by etching, so that only the central main portion remains on the transparent electrode layer except for the terminal connection portion. For this reason, even if the end surface of the base sheet may come into contact with the conductive member or the like, the main surface of the transparent electrode layer is not short-circuited to the conductive member only by the end surface of the base layer coming into contact therewith.

According to a third aspect of the present invention, there is provided a surface-emitting lamp in which a surface luminous body is laminated on a transparent electrode layer side surface of a base sheet in which a transparent electrode layer is laminated on the back surface of a transparent base layer, and which includes the surface luminous body. In the surface-emitting lamp formed by cutting into pieces, the base sheet is cut from the base layer toward the transparent electrode layer at a temperature at which the base layer is plastically deformed.

According to this structure, the base sheet is cut at a temperature at which the base layer is plastically deformed and toward the transparent electrode layer from the base layer, whereby the cut end face of the transparent electrode layer is almost deformed with the cutting. However, the cut end face of the base layer is deformed toward the transparent electrode layer side and covers the cut end face of the transparent electrode layer so as to overhang. Therefore, even if the end surface of the base sheet may come into contact with a conductive member or the like, only the end surface of the base layer comes into contact with the conductive member.
The main portion of the transparent electrode layer does not short-circuit to the conductive member.

The liquid crystal display device according to the fourth aspect is the first and second aspects.
Alternatively, the surface emitting lamp described in 3 is interposed between the liquid crystal panel and the support plate, and the end surface of the base sheet is provided so as to be able to contact the conductive member.

According to this configuration, even if the end surface of the base sheet is in contact with the conductive member, the transparent electrode layer does not short-circuit to the conductive member, and the illuminance of the surface-emitting lamp does not decrease. Therefore, there is no need to provide an insulating member between the conductive member and the surface-emitting lamp, and it is not necessary to provide the surface-emitting lamp separately from the conductive member. Therefore, the liquid crystal display device can be made compact. In addition,
It goes without saying that the conductive member in this case excludes those having the same potential as the transparent electrode layer.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device having a surface-emitting lamp according to an embodiment of the present invention will be described with reference to the accompanying drawings. This liquid crystal display device is a small one incorporated in a pager, for example. FIG. 1 is an exploded perspective view, and FIG. 2 is a sectional view thereof. As shown in both figures, the liquid crystal display device 1 is configured by laminating a circuit board (support plate) 2, a surface-emitting lamp 3, a liquid crystal panel 4, and a shield frame (shield member) 5 in this order from the bottom. . The surface-emitting lamp 3 is a so-called electroluminescence lamp, and constitutes a backlight of the liquid crystal panel 4.

The circuit board 2 and the liquid crystal panel 4 have their terminals connected to each other by a conductive film (heat seal) 6. The shield frame 5 is made of a metal such as stainless steel, and is formed in a frame shape with a portion where the film 6 is provided notched. Also,
The shield frame 5 includes a liquid crystal panel 4, a surface-emitting lamp 3,
A peripheral plate 21 is formed to be bent to a thickness including the spacer 7 described later, and a lower end of the peripheral plate in the long side direction and the short side direction is used to hold the shield frame 5 on the circuit board 2. A pair of four locking pieces 22 are formed. An elastic spacer 7 made of an insulating material such as silicon rubber is provided between the circuit board 2 and the surface-emitting lamp 3.

In such a configuration, the spacer 7 is mounted on the circuit board 2, the surface-emitting lamps 3 and the liquid crystal panel 4 are mounted thereon, and the shield frame 5 is further mounted thereon. Is assembled. At this time, the liquid crystal panel 4, the surface-emitting lamp 3, and the spacer 7, which are superposed, are sandwiched between the circuit board 2 and the shield frame 5, and each of the latch pieces 22 is further pressed.
Is bent toward the circuit board 2 so that the shield frame 5 is assembled. In this case, the liquid crystal panel 4 and the surface-emitting lamp 3 are positioned so that their respective end faces are in contact with the inner surface of the peripheral side plate 21 of the shield frame 5 and are immovably incorporated due to the elasticity of the spacer 7.

The shield frame 5 shields the electromagnetic wave nozzle generated on the circuit board 2 so as not to leak outside, and forms a part of a case for accommodating the liquid crystal panel 4 and the surface-emitting lamp 3. . The four latching pieces 22 of the shield frame 5 are in contact with the ground pattern formed on the circuit board 2 in a state of being latched on the circuit board 2, and the shield frame 5 is Grounded.

A liquid crystal panel 4 is provided on both sides of the circuit board 2.
A driving circuit such as a surface emitting lamp 3 and the like are incorporated, and a spacer 7 is mounted on the front side of the circuit board 2 so as to escape the mounting components 31 of the driving circuit. The three terminals 8, 8, 8 provided on the surface-emitting lamp 3 are:
It goes around from the notch 23 of the shield frame 5 to the back side of the circuit board 2 and is soldered to its circuit pattern. Each terminal 8 of the surface-emitting lamp 3 uses a tongue-shaped metal terminal as shown in the figure, or uses conductive rubber or a coil spring, and sandwiches the terminal between the terminal 8 and the circuit board 2. It may be. When a metal terminal is used, it is preferable that the metal terminal is thermocompression-bonded to the surface emitting lamp 3 side (terminal connection portion thereof) via an anisotropic conductive member. Similarly, in the case of conductive rubber, carbon is used. In the case of a coil spring, it is preferable that silver paste is printed on (the terminal connection portion of) the surface emitting lamp 3 side.

As shown in the enlarged sectional view of FIG. 3, the surface-emitting lamp 3 has a base layer 41 serving as a light-emitting surface of the surface-emitting lamp 3.
And a first electrode layer (transparent electrode layer) 42 laminated on the lower side of the base layer 41, and a light emitting layer 43 as a surface light emitter, The first insulating layer 44, the second electrode layer 45, and the second
The insulating layer 46 is patterned by screen printing or the like,
It is configured. The surface-emitting lamp 3 thus configured is formed to have a thickness of about 0.35 mm.

The base layer 41 is provided to make the surface-emitting lamp 3 rigid, and is made of transparent polyethylene terephthalate (PET) or the like. The first electrode layer 42 is made of a transparent conductive material (for example, ITO:
Terminal connection portion 4 at the end
The terminal 8 is connected to 2a. Light emitting layer 43
Is a surface light-emitting element constituting the main body of the electroluminescence lamp, and has a size corresponding to the liquid crystal panel 4 described above. The second electrode layer 45 forms a pair with the first electrode layer 42, and is made of carbon or the like printed in a film shape. In the terminal connection part 45a of the second electrode layer 45,
The terminal 8 is connected in the same manner as the first electrode layer 42. By applying AC power to both the front and back surfaces of the light emitting layer 43 via the first electrode layer 42 and the second electrode layer 45, the light emitting layer Emits light. The second insulating layer 45 also functions as a protective layer that protects the rear side of the surface-emitting lamp 3.

Further, on the periphery of the base sheet 40,
A cut line 47 is formed at a depth reaching the base layer 41 from the first electrode layer 42 and leaving the terminal connection portion 42a. This is because the end face of the first electrode layer 42 among the end faces of the base sheet 40 is
To prevent the first electrode layer 42 from being short-circuited to the ground side by contacting the inner surface of the base sheet 40. The peripheral portion of the base sheet 40 is so-called half-cut, leaving the terminal connection portion 42a. In this case, a notch 23 is widely formed in the peripheral side plate 21 of the shield frame 5 corresponding to the terminal connection portion 42a. In practice, the shield frame 5 and the first electrode layer are formed in the notch 23. Since it does not come into contact with 42, half cutting is not performed around the terminal connection portion 42a. That is, a half-cut is performed on a portion where the end face may come into contact with the shield frame 5, and the first cut is performed.
In the electrode layer 42, the peripheral portion and the central main portion are physically and electrically separated from each other. In the case where the terminal connecting portion 42a is disposed inside the position of the cut line 47, the cut line 47 is preferably formed over the entire periphery of the peripheral portion.

Although the sectional structure of the surface-emitting lamp 3 is schematically shown in the drawing, the base layer 41 occupies most of the thickness in practice. Although not shown in the drawing, the second electrode layer 45 and the second insulating layer (protective layer) 46
And an insulating layer and a shield layer made of silver paste or the like are laminated between the circuit board 2 and the surface emitting lamp 3.
From the shield. The other terminal 8 described above is connected to the shield layer. That is, the surface-emitting lamp 3 is provided with two pieces of terminals 8 for the first electrode layer 42 and the second electrode layer 45 and one piece of terminal 8 for the shield layer.

Here, a method of manufacturing the surface emitting lamp 3 will be briefly described with reference to FIG. First, the base layer 4
First, a base sheet (sheet serving as a prototype of the base sheet 40) S in which the first electrode layer 42 is laminated is prepared, and the base sheet S is provided in a region where each layer below the light emitting layer 43 is formed.
A cutting line 47 is made by a Thomson-type cutting blade Ca.
Specifically, leaving a portion to which three pieces of the terminal 8 are connected (a portion corresponding to the cutout portion 23 of the shield frame 5),
Half cutting is performed on the base sheet S from the first electrode layer 42 side so as to surround the above-described region.

Next, the light emitting layer 43, the first insulating layer 44, the second electrode layer 45, and the second
The insulating layer 46 is formed sequentially. Through these steps, a large number of element parts forming the prototype of the surface-emitting lamp 3 are formed in the base sheet S. Next, using a cutting cutter, an element portion forming a prototype of each surface-emitting lamp 3 is cut and cut into a size substantially the same as that of the liquid crystal panel 4. Finally, three pieces of terminals 8 are connected to the cut surface emitting lamp 3 to complete the surface emitting lamp 3.

Each of the layers below the light-emitting layer 43 may be formed so as to protrude outward from the cut line 47 of the base sheet 40, but at least a portion in contact with the cut line 47 has an insulating property. It is necessary that the layers come.

As described above, according to the present embodiment, half cutting is performed on the peripheral portion of the base sheet 40, and the first sheet is cut.
Since the peripheral portion and the central main portion of the electrode layer 42 are electrically separated from each other, the first electrode layer 42 of the surface-emitting lamp 3 incorporated in the liquid crystal display device 1 has its peripheral portion in contact with the shield frame 5. However, the main part does not short-circuit to the shield frame 5. Therefore, it is possible to prevent a situation where the surface emitting lamp 3 becomes dark or stops emitting light due to a short circuit.

Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG.
The surface-emitting lamp 3 according to the second embodiment has a structure in which the peripheral portion of the first electrode layer 42 is removed except for the terminal connection portion 42a. This is formed by performing etching (wet or dry) on the first electrode layer 42 so as to leave a main portion thereof, as shown in FIG. Also in this case, similarly to the first embodiment, after etching, layers other than the light-emitting layer 43 are formed in the main portion of the first electrode layer 42, and finally, the surface-emitting lamp 3 is cut out and cut. Is completed. In this case, also in this case, the terminal connection portion 4
When 2a comes inside the etching position, it is preferable to perform etching over the entire periphery of the peripheral portion.

As described above, according to the present embodiment, the peripheral portion of the first electrode layer 42 is removed by etching.
The electrode layer 42 does not come into contact with the shield frame 5, and its main part does not short-circuit to the shield frame 5.

Next, a third embodiment of the present invention will be described with reference to FIGS. As shown in FIG.
The surface-emitting lamp 3 according to the second embodiment has a structure in which the end surface of the first electrode layer 42 is covered with the end of the base layer 41. This is, as shown in FIG. 8, by forming each layer below the light-emitting layer 43 in the base sheet S, and then heating the cutting blade Cb in the cutting and cutting.
It is formed. That is, the cutting blade Cb is provided with the base layer 41.
When the base sheet S is cut and cut by the heated cutting blade Cb, the edge of the base layer 41 is thermally deformed when the cutting blade Cb is cut. Thus, the end surface of the first electrode layer 42 is covered. In both of the drawings schematically, the ratio of the thickness of the base layer 41 to the first electrode layer 42 is about 2 to 3 times, but the thickness is actually several tens of times, and the base layer 41 is slightly deformed. However, the end face of the first electrode layer 42 is covered by the end of the base layer 41, and the end face of the base layer 41 protrudes from the end face of the first electrode layer 42 even if it is not completely covered.

Therefore, also in the surface-emitting lamp 3 according to the third embodiment, the end face of the first electrode layer 42 does not contact the shield frame 5 and the first electrode layer 42
Is not short-circuited to the shield frame 5.

The surface-emitting lamp 3 in each embodiment
Is an example and is not limited to this. In these embodiments, the case where the base sheet 40 of the surface-emitting lamp 3 contacts the shield frame 5 has been described. However, the case where the base sheet 40 contacts another grounded conductive component is also applicable. ,
It is exactly the same. Further, the surface emitting lamp 3 is applicable to a lighting device and the like.

[0032]

As described above, according to the surface-emitting lamp of the present invention, even if the end face may come into contact with the conductive member, the transparent electrode layer does not short-circuit with the conductive member and no light is emitted. Problems such as a decrease in illuminance can be solved.

According to the liquid crystal display device of the present invention, even if the end surface of the surface-emitting lamp comes into contact with the conductive member, there is no problem such as a decrease in illuminance of the surface-emitting lamp. Can be intensively arranged, and the size of the device itself can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device including a surface-emitting lamp according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a liquid crystal display device.

FIG. 3 is an enlarged cross-sectional view schematically illustrating a cross-sectional structure of the surface-emitting lamp according to the first embodiment.

FIG. 4 is an explanatory view illustrating a method for manufacturing the surface-emitting lamp according to the first embodiment.

FIG. 5 is an enlarged cross-sectional view schematically illustrating a cross-sectional structure of a surface-emitting lamp according to a second embodiment.

FIG. 6 is an explanatory view illustrating a method for manufacturing a surface-emitting lamp according to a second embodiment.

FIG. 7 is an enlarged cross-sectional view schematically illustrating a cross-sectional structure of a surface-emitting lamp according to a third embodiment.

FIG. 8 is an explanatory view illustrating a method for manufacturing a surface-emitting lamp according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Circuit board 3 Surface emitting lamp 4 Liquid crystal panel 5 Shield frame 8 Terminal 21 Peripheral side plate 40 Base sheet 41 Base layer 42 First electrode layer 43 Light emitting layer 44 First insulating layer 45 Second electrode layer 46 Second insulation Layer 47 score line

Claims (4)

[Claims] 1. A base sheet in which a transparent electrode layer is laminated on the back surface of a transparent base layer, a surface luminous body is laminated on a surface on the transparent electrode layer side of the base sheet, and cut into a size including the surface luminous body. The surface emitting lamp according to claim 1, wherein a cut line is formed in a peripheral portion of the base sheet at a depth reaching the base layer from the transparent electrode layer. 2. A base sheet in which a transparent electrode layer is laminated on the back surface of a transparent base layer, a surface luminous body is laminated on a surface on the transparent electrode layer side of the base sheet, and cut into a size including the surface luminous body. The surface emitting lamp according to claim 1, wherein a peripheral portion of the transparent electrode layer is removed by etching. 3. A base sheet in which a transparent electrode layer is laminated on the back surface of a transparent base layer, a surface luminous body is laminated on the surface on the transparent electrode layer side of the base sheet, and cut to a size including the surface luminous body. The surface emitting lamp according to claim 1, wherein the base sheet is cut from the base layer side and at a temperature at which the base layer is plastically deformed, and from the base layer toward the transparent electrode layer. 4. The surface-emitting lamp according to claim 1, interposed between a liquid crystal panel and a support plate, and an end face of the base sheet is provided so as to be able to contact a conductive member. Liquid crystal display device.