JP2001083901A - Flat panel type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate deficiency of an image display, and to facilitate mounting and removing of a liquid crystal panel. SOLUTION: A tapered portion 31 that separates from a display panel 2 gradually from the lower side than a boundary surface between panel materials 4, 5 toward the upper end is formed in a holding wall 15 of a holding frame 11 for holding the periphery of a flat display panel 2 such as a liquid crystal panel. A holding surface 15a abutting on only the end surface of the panel material 4 below the boundary surface between the panel materials 4, 5 is provided on the panel material 4 side below the boundary surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device such as a liquid crystal display device, and more particularly to a support structure for a flat display panel.

[0002]

2. Description of the Related Art In recent years, as devices become smaller, lighter, and thinner, flat panel electronic display devices (hereinafter, referred to as flat panel display devices) typified by liquid crystal display devices used in various devices have also become thinner. Is being
The support structure of the flat display panel has also been devised to reduce the thickness.

[0003] Hereinafter, as a conventional example, an example of a liquid crystal display device having a backlight will be described as an example of a flat panel display device.

As shown in FIG. 8, a conventional liquid crystal display 1
Has a rectangular liquid crystal panel 2 and a rectangular light guide plate 3 for backlight provided on the lower surface side of the liquid crystal panel 2. The liquid crystal panel 2 is composed of panel members 4 and 5 made of a pair of glass plates bonded to each other, and polarizing plates 6 provided on the front and back of the panel members 4 and 5. The lower panel member 4 is a TFT panel to which a shutter function for controlling light from the light guide plate 3 is added. The upper panel member 5 is a color filter (CF) panel provided with dots of three primary colors for color display.

The periphery of the liquid crystal panel 2 and the light guide plate 3 is held between a synthetic resin holding frame 11 formed in a rectangular frame shape and outer frames 16 and 17.

[0006] The holding frame 11 has a holding wall 15 formed on the upper side so as to extend in the circumferential direction.
The liquid crystal panel 2 is disposed on the inner peripheral side of the liquid crystal panel, and is positioned and held by the holding surface 15a, which is the inner surface thereof, in a state where the liquid crystal panel 2 is juxtaposed along the surface direction.

The holding frame 11 has a holding recess 12 formed below the holding frame 11, and the light guide plate 3 is fitted and held in the holding recess 12. In addition, a spacer 13 is formed on the holding frame 11 between the light guide plate 3 and the liquid crystal panel 2 so as to extend in the circumferential direction. Beside
The liquid crystal panel 2 attaches the lower panel material 4 to the spacer portion 1.
3 is arranged in a state of contact.

As described above, the liquid crystal panel 2 and the light guide plate 3
The outer frames 16 and 17 such as upper and lower holding brackets each having an L-shaped cross section are fitted into the holding frame 11 for holding the periphery of the outer frame 16 and 17.
The light guide plate 3 and the liquid crystal panel 2 are integrated with the holding frame 11 to form a liquid crystal display module.

And such a liquid crystal display module,
It is designed to be attached to a display housing of an information processing device.

As shown in FIGS. 9A and 9B, the liquid crystal panel 2 has two sides of the CF substrate 5 so that electrode terminals (not shown) provided along two adjacent sides of the TFT substrate 4 are exposed. It is configured to be disposed at a position retracted from the end surface of the TFT substrate 4. Then, as shown in FIG. 9C, the printed circuit board 23 on which the control semiconductor IC is mounted and the electrode terminals of the TFT substrate 4 are electrically connected via a TCP (tape carrier package) 24.

In order to manufacture such a liquid crystal display panel 2, first, as shown in FIG. 10A, a panel member 4a having panel members 4 and 5 having the same outer shape is attached to a panel 2a which is a TFT panel. Outline (dotted line 4 in FIG. 10A)
10B), a cutting groove 201 is formed by the high-penetration cutter 21 and then the panel 2a is turned over and a predetermined impact is applied by a hammer from the opposite side of the cutting groove 201 as shown in FIG. 10B. In addition, only the panel material 4 which is a TFT panel is split.

Next, as shown in FIG. 10C, a high-penetration cutter 21 similarly cuts from a panel material 5 side which is a CF panel along a predetermined outer shape (an outer shape indicated by a two-dot chain line 51 in FIG. 10C). A groove is formed, and then the panel 2a is turned over and a predetermined impact is applied by a hammer from the opposite side of the cut groove to break only the CF panel.

In this way, as shown in FIG. 9A,
The liquid crystal panel 2 including the panel members 4 and 5 formed in a predetermined outer shape is obtained.

The liquid crystal panel 2 whose outer periphery has been cut as described above
As shown in FIG. 9B, chamfering is performed by polishing front and back corners of the cut surface. In addition,
This chamfering is also applied to the corners of the panel member 4 on the side of the bonding surface with the panel member 5 on each side in the longitudinal direction and the width direction having the electrode to which the TCP is connected.

In the liquid crystal panel 2 which has been chamfered as described above, a printed circuit board 23 is connected to each side of the longitudinal direction and the width direction having electrodes via a TCP 24 as shown in FIG. 9C. After that, it was stored in the holding wall 15 of the holding frame 11.

[0016]

As described above, when the liquid crystal panel 2 is manufactured by cutting the panel 2a so as to have a predetermined outer shape, each of the other components in the longitudinal and width directions to which the TCP 24 is not connected is used. On one side, the panel members 4 and 5 are cut with the same outer shape so that the cut surfaces thereof coincide with each other, but the boundary between the panel members 4 and 5 is, as shown in FIG. Of the sharp edge 501
Was sometimes exposed.

Since the edge 501 is slightly displaced, it cannot be chamfered. Therefore, the edge 501 has to be stored and held in the holding wall 15 of the holding frame 11 as it is.

The liquid crystal panel 2 in which the panel members 4 and 5 are displaced from each other is supported by the holding frame 11 together with the light guide plate 3 as shown in FIGS. When the device 1 is used, the liquid crystal panel 2
The edge 401 of the panel member 4 caused by the displacement of the panel members 4 and 5 when or after the panel member 4 is mounted on the holding frame 11.
Alternatively, the edge 501 of the panel material 5 may cut the holding surface 15a of the holding wall 15 of the holding frame 11 in some cases.

The holding surface 1 of the holding wall 15 is
When 5a is shaved, the foreign matter whose holding wall 15 has been shaved is
The light guide plate 3 enters between the liquid crystal panel 2 and the light guide plate 3.
There is a problem that light from the light source is partially blocked, causing a problem in display by the liquid crystal display device 1. This problem also occurs in a reflection type liquid crystal display device employing a reflection plate instead of a light guide plate.

Further, since the holding frame 11 is provided in the thickness direction so as to surround the periphery of the liquid crystal panel 2 by the holding wall 15, the work of removing the liquid crystal panel 2 for inspection, maintenance or replacement. Not only is it difficult to mount the liquid crystal panel 2 on the holding frame 11 but also requires a great deal of trouble.

Needless to say, these problems are not limited to the liquid crystal display panel, but also occur in other flat panel display devices having two glass substrates arranged opposite to each other, for example, a plasma display device.

Accordingly, it is an object of the present invention to provide a flat panel display device having a holding frame structure capable of suppressing the holding frame from being cut off by edges of a flat display panel such as a liquid crystal display panel. is there.

Another object of the present invention is to provide a flat panel display device having a holding frame structure capable of suppressing occurrence of display defects due to foreign matter.

Still another object of the present invention is to provide a flat panel type display device having a holding frame structure capable of easily mounting and removing a display panel.

[0025]

According to the display device of the present invention, there is provided a display panel having a pair of substrates arranged opposite to each other;
In a display device including a holding frame that supports the back substrate of the display panel and a front outer frame that supports the front substrate of the display panel facing the holding frame, the holding frame includes an end surface of the back substrate. And an end surface supporting portion and a peripheral supporting portion that are in contact with the peripheral surface, respectively. The distance between the upper end portion of the support surface of the end surface support portion of the holding frame and the support surface of the peripheral support portion is smaller than the thickness of the back side substrate.

Further, in such a display device, the end face supporting portion has a front side projecting portion extending toward the outer frame,
The front projection is provided with an inclination such that the distance from the upper end portion of the support surface of the end surface support portion to the outer frame gradually increases toward the outer frame. Accordingly, when the liquid crystal panel is stored in the holding frame, the liquid crystal panel is smoothly guided and stored in the holding wall by the tapered portion formed in the holding wall. Can be facilitated.

This end face support may be provided selectively. In other words, the end face of the liquid crystal panel housed in the holding frame can be gripped by the notch formed in the holding wall, thereby facilitating the work of removing the liquid crystal panel during inspection, maintenance, or replacement of the liquid crystal panel. be able to.

In the above flat panel display device, the display panel is a liquid crystal display panel, and a light guide plate for accommodating a light guide plate for a backlight is provided on a side of the holding frame opposite to a side on which the liquid display panel is supported. It may have a housing wall and a back side outer frame that supports the light guide plate.

Alternatively, in the above flat panel display device, the display panel is a liquid crystal display panel, and has a reflection plate housing wall for housing a light reflection plate on a side of the holding frame opposite to the liquid crystal display panel, and a reflection plate. May be provided with a back side outer frame that supports.

In the present invention, the area of the back side substrate is larger than the area of the front side substrate. Further, the back-side substrate is characterized in that a ridge portion between the end surface and a surface that comes into contact with the peripheral support portion is chamfered.

Further, an edge supporting portion is selectively provided at a corner of the holding frame so that the edge supporting portion is separated from the corner of the back side substrate. For example, by forming a notch in the corner of the holding wall, it is possible to reliably prevent the corner of the liquid crystal panel from interfering with the holding wall, and to prevent a problem caused by the corner of the liquid crystal panel interfering with the holding wall. Can be prevented.

Still further, at least one side of the display panel is characterized in that the end faces of the opposing substrates are located substantially in the same plane.

In the above flat panel display device, the outer frame is composed of a front outer frame and a rear outer frame.
The front side outer frame is configured to press the other substrate constituting the display panel against the holding frame side, and the back side outer frame is configured to press the holding frame against the display panel side. I do.

In particular, according to the present invention, a light guide plate of a backlight, which is a plate-like light source, a liquid crystal panel including a pair of translucent panel materials bonded to each other, and a light guide plate and a liquid crystal panel A holding frame that holds the periphery thereof and is arranged side by side along the plane direction, wherein the holding frame is formed with a holding wall surrounding the periphery of the liquid crystal panel, and the holding wall includes: A liquid crystal display device characterized by having a holding surface capable of abutting only on the end face of the one panel material on the one panel material side from the boundary between the panel materials is obtained.

As described above, on the holding wall surrounding the periphery of the liquid crystal panel, on the one panel material side from the boundary between the panel materials, the holding surface capable of contacting only the end face of the one panel material is formed. Therefore, when the liquid crystal panel is mounted or after mounting, the edge of the boundary between the panel materials of the liquid crystal panel comes into contact with the holding wall, and the holding wall is shaved, causing foreign matter to be generated between the liquid crystal panel and the light guide plate. It is possible to reliably prevent inconvenience such as entering the display and causing a display problem. Further, on the panel material side below the boundary between the panel materials, the holding surface can contact only the lower panel material, so that the edge formed by the displacement of the upper and lower panel materials is on the holding wall. It is possible to reliably prevent a problem such as cutting due to interference.

[0036]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Hereinafter, as an example of the display device according to the present invention,
A transmissive liquid crystal display device employing a liquid crystal display panel as a display panel and having a light guide member for a backlight will be described as an embodiment.

The same components as those of the above-described prior art are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIGS. 1 and 2, the holding wall 15 of the holding frame 11 constituting the liquid crystal display device 1 of the present embodiment
A tapered portion 31 is formed on the inner peripheral side on the upper side.

The tapered portion 31 has a lower edge 3
1a is located below the boundary between the panel members 4 and 5 of the liquid crystal panel 2 which is housed and mounted on the inner peripheral side of the holding wall 15.

That is, the configuration is such that only the end face of the TFT substrate 4 contacts the holding frame 11 and the end face of the CF substrate 5 does not contact the holding frame 11. Thereby, the holding wall 1
5 is located at the upper end position, that is, the edge 31.
a is located below the boundary position between the panel members 4 and 5. In the case of a liquid crystal display panel,
Since the liquid crystal layer is interposed between the substrates, the boundary between the pair of substrates has a certain width corresponding to the thickness of the liquid crystal layer. In this case, the boundary is based on a plane parallel to the inner surface of the back side substrate. Becomes

In other words, the height of the holding surface 15a is smaller than the thickness of the substrate 4 abutting thereon. That is, the holding frame 11 is provided with a holding wall 15 and a peripheral supporting portion 13 which serve as end surface supporting portions which respectively contact the end surface and the peripheral surface of the rear substrate 4 of the display panel. The distance between the end surface support, that is, the upper end 31a of the support surface of the holding wall 15 and the support surface of the spacer 13 serving as the peripheral support is smaller than the thickness of the back substrate 4. Therefore, the holding surface 15a can contact only the end surface of the panel member 4.

As shown in FIG. 3, the intersection P between the tapered portion 31 and an extension line extending horizontally from the boundary between the panel members 4 and 5 of the liquid crystal panel 2 to the outer peripheral side is a predetermined dimension L from the holding surface 15a. The position is horizontally away from the outer periphery.

That is, the panel material 4 below the liquid crystal panel 2
When the end surface formed by the cut surface of the above abuts against the holding surface 15a of the holding wall 15, a gap of a predetermined dimension L is formed in the horizontal direction between the upper end of the panel material 4 and the tapered portion 31.
The tapered portion 31 is inclined. In addition, this predetermined dimension L
Is about 0.5 mm here. The reason is that the displacement between the panel members 4 and 5 constituting the liquid crystal panel 2 is about 0.3 mm at the maximum.

As shown in FIGS. 1 and 4, a plurality of notches 32 are formed on the holding wall 15 of the holding frame 11 at intervals in the circumferential direction.

The depth of each of the notches 32 corresponds to the upper surface of the spacer 13 of the holding frame 11. That is, the bottom surface of the notch 32 is flush with the upper surface of the spacer 13.

The side where the printed circuit board 23 is connected by the TCP 24 of the liquid crystal panel 2, that is, the TFT
A holding wall 15 for holding an end face of a side where the TCP 24 is connected to an electrode from which the panel material 4 as a panel is projected and exposed.
Are formed with a plurality of notches 33 similar to the notches 32, and the TCPs 24 are passed through these notches 33.

At the corner of the holding frame 11, a notch 34 is formed on one side of the holding wall 15, which is orthogonal to each other, so that the corner between the liquid crystal panel 2 and the holding wall 15 may interfere with each other. Is prevented.

According to the holding frame 11, when the liquid crystal panel 2 is stored in the holding wall 15, the edge of the liquid crystal panel 2 is smoothly guided by the tapered portion 31 of the holding wall 15. The liquid crystal panel 2 is stored and held on the inner peripheral side of the holding wall 15 very easily.

Here, as shown in FIGS. 5 and 6, the edge formed by the displacement of the panel members 4 and 5 is formed on the end face of the cut surface of the liquid crystal panel 2 housed on the inner peripheral side of the holding wall 15. Even if there are 401 and 501, the upper end position of the holding surface 15a of the holding wall 15 is located below the boundary position between the panel members 4 and 5, and can contact only the end surface of the lower panel member 4. , The edges 401 and 501
And the holding wall 15 do not interfere with each other.

In particular, as shown in FIG. 5, even if the upper panel member 5 protrudes to the outer peripheral side and shifts, the end surface of the panel member 4 below the liquid crystal panel 2 is held by the holding surface 15 of the holding wall 15.
a, the upper end of the panel member 4 and the tapered portion 3
The tapered portion 31 is inclined so that a gap having a predetermined dimension L of about 0.5 mm is formed in the horizontal direction between the tapered portion 31 and the tapered portion 31.
Since the maximum displacement between the panel members 4 and 5 constituting the liquid crystal panel 2 is about 0.3 mm, the protruding upper edge 501 of the panel member 5 does not interfere with the tapered portion 31.

As described above, according to the liquid crystal display device of the present embodiment, the holding member 15 surrounding the periphery of the liquid crystal panel 2 is provided with one or more lower panel materials than the boundary between the panel materials 4 and 5. On the side of the liquid crystal panel 2, the holding surface 15 a that can be brought into contact with only the end face of the panel material 4 is formed.
At the time of mounting or after mounting, the edge of the boundary between the panel materials 4 and 5 of the liquid crystal panel 2 abuts the holding wall 15 so that the holding wall 15 is shaved and foreign matter is generated. It is possible to reliably prevent the inconvenience of intruding between the light plate 3 and causing a problem in displaying a screen.

When the liquid crystal panel 2 is housed in the holding frame 11 and held, the liquid crystal panel 2 is smoothly guided and housed in the holding wall 15 by the tapered portion 31 formed in the holding wall 15. Therefore, the liquid crystal panel 2
Can be easily stored.

Furthermore, since the notch 32 formed in the holding wall 15 can grip the end face of the liquid crystal panel 2 housed in the holding frame 11, the liquid crystal during inspection, maintenance or replacement of the liquid crystal panel 2 can be held. The work of removing the panel 2 can be facilitated.

Further, since the notches 34 are formed at the corners of the holding wall 15, the corners of the liquid crystal panel 2 are
The liquid crystal panel 2 can be reliably prevented from interfering with the liquid crystal panel 2, thereby preventing a problem caused by the corner of the liquid crystal panel 2 interfering with the holding wall 15.

In the above example, the tapered portion 31 is formed on all of the holding walls 15 of the holding frame 11.
1 may be formed on the holding wall 15 that holds at least a cut surface of a side other than the side having the electrodes of the liquid crystal panel 2.

FIG. 7 shows a holding frame 11 in which a tapered portion 31 is formed only on a holding wall 15 for holding three other end faces, excluding one side in the longitudinal direction having electrodes of the liquid crystal panel 2. is there.

In the case of the holding frame 11, one end of one side in the longitudinal direction having the electrodes of the liquid crystal panel 2 is brought into contact with the holding wall 15 on which the tapered portion 31 is not formed, and the holding wall 15 is positioned. The liquid crystal panel 2 is housed in 15. When stored in this manner, at the time of storage, an end surface other than the end surface abutting on the holding wall 15 is guided into the holding wall 15 by the tapered portion 31 formed on the holding wall 15 and is smoothly stored.

In the case of the holding frame 11, in particular, if the taper angle of the tapered portion 31 of the holding wall 15 that holds the end faces on both sides of the end face abutting on the holding wall 15 is further reduced, Smooth storage can be performed.

If the holding wall 15 is provided at a position for holding the corner of the liquid crystal panel 2, the liquid crystal panel 2 can be securely held and stored in the holding frame 11. .

[0061]

As described above, when the present invention is applied to a liquid crystal display device, the following effects can be obtained.

Since the holding wall surrounding the periphery of the liquid crystal panel has a holding surface formed on one of the panel members from the boundary between the panel members, the holding surface can contact only the end surface of the one panel member. At the time of or after mounting the LCD panel, the edge of the boundary between the panel materials of the liquid crystal panel abuts against the holding wall, and the holding wall is shaved, resulting in foreign matter entering between the liquid crystal panel and the light guide plate and displaying. It is possible to reliably prevent inconvenience such as causing a problem.

Since the holding surface can contact only the lower panel material on the panel material side below the boundary between the panel materials, the edge formed by the displacement of the upper and lower panel materials is held. It is possible to reliably prevent a problem such as cutting due to interference with a wall.

When the liquid crystal panel is stored in the holding frame, the liquid crystal panel is smoothly guided and stored in the holding wall by the tapered portion formed in the holding wall. Can be facilitated.

The end face of the liquid crystal panel housed in the holding frame can be gripped by the notch formed in the holding wall, so that the work of removing the liquid crystal panel at the time of inspection, maintenance or replacement of the liquid crystal panel can be facilitated. Can be planned.

The holding wall allows the liquid crystal panel to be held in a state where the liquid crystal panel is stored while holding its corners.

Since the notch is formed at the corner of the holding wall, it is possible to reliably prevent the corner of the liquid crystal panel from interfering with the holding wall, and the corner of the liquid crystal panel interferes with the holding wall. Problems can be prevented.

The present invention is not limited to a liquid crystal display device, but can be applied to other flat display devices employing a flat display panel such as an electroluminescence (EL) display device or a plasma display device. Needless to say.

[Brief description of the drawings]

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

FIG. 2 is a partial sectional view taken along line BB of FIG.

FIG. 3 is a partially enlarged sectional view of FIG. 2;

FIG. 4 is a partial perspective view of a holding frame according to the present invention.

FIG. 5 is a partial cross-sectional view illustrating a storage state of a liquid crystal panel in a holding frame according to the present invention.

FIG. 6 is a partial cross-sectional view illustrating a storage state of a liquid crystal panel in a holding frame according to the present invention.

FIG. 7 is a plan view of a liquid crystal display according to another embodiment of the present invention.

FIG. 8 is a partial cross-sectional view of a conventional liquid crystal display device.

FIG. 9A is a plan view of a liquid crystal panel included in a conventional liquid crystal display device. (B) is an enlarged sectional view along the AA line of (a). (C) is a plan view showing a liquid crystal panel provided with a conventional drive circuit.

FIG. 10A is a plan view illustrating a step of cutting a TFT substrate in a conventional example. (B) is a sectional view for explaining a panel cutting step in the conventional example. (C) is a top view explaining the cutting process of the CF substrate in the conventional example.

FIG. 11 is an enlarged cross-sectional view of an end portion of a liquid crystal panel for explaining displacement between panel materials in a conventional example.

FIG. 12 is a partial cross-sectional view of a liquid crystal display device illustrating a stored state of a liquid crystal panel in a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid crystal display device 2 liquid crystal panel 3 light guide plate 4, 5 panel material 11 holding frame 15 holding wall 15 a holding surface 31 taper portion 32, 33 cutout portion 34 cutout portion

Claims (10)

[Claims] A flat display panel configured by arranging a pair of substrates opposed to each other; a holding frame for supporting a back side substrate of the display panel; and a front side substrate of the display panel facing the holding frame. A supporting side outer frame, wherein the holding frame has an end surface supporting portion and a peripheral supporting portion that respectively contact an end surface and a peripheral surface of the back side substrate, and the supporting surface upper end portion of the end surface supporting portion and the A flat panel display device, wherein a distance between a peripheral supporting portion and a supporting surface is smaller than a thickness of the back side substrate. 2. The end face supporting portion has a surface side protruding portion extending toward the outer frame, and the surface side protruding portion extends from an upper end of a supporting surface of the end surface supporting portion toward the outer frame. The flat panel display device according to claim 1, wherein an inclination is provided so that the distance from the substrate end surface gradually increases. 3. The flat panel display device according to claim 2, wherein the end face support is selectively provided. 4. The display panel is a liquid crystal display panel, and has a light guide plate housing wall for housing a light guide plate for a backlight on a side of the holding frame opposite to a side on which the liquid display panel is supported. The flat panel display device according to claim 1, further comprising a back outer frame supporting the light guide plate. 5. The display panel is a liquid crystal display panel, and has a reflector housing wall for housing a light reflector on a side of the holding frame opposite to the liquid crystal display panel, and a back side for supporting the reflector. The flat panel display device according to claim 1, further comprising an outer frame. 6. The flat panel display device according to claim 1, wherein an area of the rear substrate is larger than an area of the front substrate. 7. The flat panel display device according to claim 1, wherein the back side substrate has a chamfered edge portion between an end surface thereof and a surface abutting on the peripheral support portion. . 8. The end face support portion is selectively provided at a corner of the holding frame such that the end face support portion is separated from the corner portion of the back side substrate. 4. The flat panel display device according to 1. 9. The flat panel display device according to claim 1, wherein at least one side of the display panel has end faces of opposing substrates located substantially in the same plane. 10. The outer frame includes a front outer frame and a rear outer frame, and the front outer frame is configured to press the other substrate forming the display panel against the holding frame. The flat panel display device according to claim 1, wherein the outer frame on the back side is configured to press the holding frame against the display panel.