JP4568028B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly to a technique effective in reducing the thickness of a display device.

A liquid crystal display module having a small liquid crystal display panel (for example, a TFT liquid crystal display panel) is used as a display unit of a cellular phone or the like.
FIG. 9 is an exploded perspective view showing a schematic structure of a conventional liquid crystal display module used as a display unit of a mobile phone or the like.
As shown in FIG. 9, a conventional liquid crystal display module used as a display unit of a mobile phone or the like includes a liquid crystal display panel 1 housed in a frame (also referred to as a first holder) 2, and this liquid crystal display panel 1 is accommodated in an outer frame (also called a second holder) 12.
Further, on one side of the liquid crystal display panel 1, a semiconductor chip (3, 4) constituting a driver for driving each subpixel in the liquid crystal display panel 1 is mounted, and on one side of the liquid crystal display panel 1. Is connected to one end of the flexible circuit board 5.
FIG. 10 shows the configuration of the frame 2 and the back side of the liquid crystal display panel 1 shown in FIG.
The flexible circuit board 5 is bent in the vicinity of one side of the liquid crystal display panel 1, and the other end is disposed on the back side of the frame 2. A circuit component 7 is mounted on the other end side of the flexible circuit board 5. In FIG. 10, 6 is a reflection sheet.

FIG. 11 is a top plan view of the frame 2 and the liquid crystal display panel 1 shown in FIG. 12 is a cross-sectional view showing a cross-sectional structure taken along the line AA ′ shown in FIG.
As shown in FIG. 12, an optical sheet group (for example, an upper diffusion sheet, a lens sheet, a lower diffusion sheet, etc.) 9, a light guide plate 8, and a reflection sheet 6 are arranged in the frame 2 in the order shown in FIG. . Here, the frame 2, the optical sheet group 9, the light guide plate 8, the light source (not shown), and the reflective sheet 6 constitute a backlight.
The liquid crystal display panel 1 is fixed to the frame 2 with a double-sided tape 11. In FIG. 12, 10 is a spacer, TFT and CF are glass substrates, and POL1 and POL2 are polarizing plates.
As shown in FIG. 12, in the state where the flexible circuit board 5 having one end connected to one side of the liquid crystal display panel 1 is bent near one side of the liquid crystal display panel 1 and the other end is arranged on the back side of the frame 2, A portion of the flexible circuit board 5 that is bent toward the back side of the frame 2 is swelled by a stress (hereinafter referred to as a springback force) that causes the circuit board 5 to spread.
As shown in FIG. 13, when the outer frame 12 is mounted on the liquid crystal display module in the state shown in FIG. 12, the flexible circuit board 5 is sandwiched between the frame 2 and the outer frame 12, so that it swells. However, since the spring back force of the flexible circuit board 5 is not eliminated, the spring back force is transmitted to the display surface side of the liquid crystal display panel 1, and is indicated on the liquid crystal display panel 1 by an arrow A in FIG. Apply such a force.
This force acts to lift the liquid crystal display module together with the action of peeling the liquid crystal display panel 1 from the double-sided tape 11.

In recent years, the liquid crystal display module shown in FIG. 9 has been required to be thinner.
Therefore, for example, when the backlight is thinned in order to reduce the thickness of the liquid crystal display module, the bending radius of the flexible circuit board 5 is inevitably reduced.
As a result, the force indicated by the arrow A in FIG. 13 also increases, and there is a problem that the liquid crystal display panel 1 is lifted from the frame 2 or the entire liquid crystal display module is lifted.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to display a display device even when the display device is made thinner and the bending radius of the flexible circuit board is smaller. The object is to provide a technique capable of preventing the panel from floating.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
In order to achieve the above-described object, in the present invention, a display panel, a backlight disposed on the back surface of the display panel, a first holder for housing the display panel and the backlight, and the display panel And a flexible circuit board connected to the first side of the display panel, wherein the first holder has an opening in the vicinity of the first side of the display panel, at least on the opposite side of the display panel. The flexible circuit board is bent and partially disposed on the back surface of the first holder, and has a protrusion inserted into the hole.

  In addition, the present invention is a display device comprising a display panel, a first holder for housing the display panel, and a flexible circuit board connected to a first side of the display panel, The holder has a hole opening at least on the opposite side of the display panel in the vicinity of the first side of the display panel, and the flexible circuit board is bent and a part of the hole is opened. It has the projection part inserted in the said hole part while being arrange | positioned on the back surface, It is characterized by the above-mentioned.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
According to the present invention, it is possible to prevent the display panel from being lifted even when the display device is made thinner and the bending radius of the flexible circuit board becomes smaller.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
[Example 1]
FIG. 1 is a cross-sectional view showing a cross-sectional structure of a liquid crystal display module according to Embodiment 1 of the present invention. 1 is a cross-sectional view showing a cross-sectional structure of the same portion as FIG.
The liquid crystal display panel 1 is formed by bonding a glass substrate (TFT) on which a thin film transistor, a drain line, a gate line, and the like are formed, and a glass substrate (CF) on which a counter electrode, a color filter, and the like are formed, with a sealant therebetween. Liquid crystal is sealed between a glass substrate (TFT) and a glass substrate (CF), and polarizing plates (POL1, POL2) are attached to the outside of the glass substrate (TFT, CF). In addition, since the structure of a glass substrate (TFT) and a glass substrate (CF) is not directly related to this invention, description of the structure of each board | substrate is abbreviate | omitted.
In the present embodiment, the frame 2 has a hole portion 14 that opens to the opposite side of the liquid crystal display panel 1, while the flexible circuit board 5 is formed in the hole portion 14 at a portion that is bent toward the back side of the frame 2. It has the projection part 13 inserted in. The hole part 14 should just open to at least one side.

Accordingly, in this embodiment, when a part of the flexible circuit board 5 is bent and disposed on the back side of the frame 2, the protrusion 13 provided on the flexible circuit board 5 is replaced with the hole provided in the frame 2. By inserting it in 14, it becomes possible to support the springback force at that position.
The position of the protrusion 13 provided on the flexible circuit board 5 and the hole 14 provided on the frame 2 is set to the first side of the liquid crystal display panel 1 (side to which the terminal part of the flexible circuit board 5 is connected). In the vicinity, the springback force can be effectively supported. As a result, as shown in FIG. 2, even when the outer frame 12 is mounted on the liquid crystal display module in the state shown in FIG. It is possible not only to reduce the action of floating 1, but also to reduce the floating of the flexible circuit board 5 that occurs on the opposite side of the frame 2 from the liquid crystal display panel 1.
Therefore, in this embodiment, even if the liquid crystal display module is thinned and the bending radius of the flexible circuit board 5 is reduced, the liquid crystal display panel 1 is prevented from floating from the frame 2 or from being lifted for each liquid crystal display module. Is possible.
In addition, the hole part 14 opened to at least one in this specification is the concept containing both the hollow opened only to one side, and the through-hole which has an opening in both.

In this embodiment, when only one protrusion 13 and hole 14 are provided, it is effective to provide the hole 14 and protrusion 13 on the central axis of the frame 2 as shown in FIG. is there.
From the viewpoint of assembling the liquid crystal display module, it is desirable to provide only one protrusion 13 and one hole 14, but when two or more are provided, the hole 14 and protrusion 13 are provided as shown in FIG. It is effective to provide them symmetrically with respect to the central axis of the frame 2.
In this embodiment, the flexible circuit board 5 requires the protrusion 13, and (A) it is necessary to prepare a separate component for that purpose, and (B) a separate process for mounting the component on the flexible circuit board 5 is necessary. There is a problem of becoming.
As a method for solving this problem, as shown in FIG. 5, by using the circuit component 16 mounted on the flexible circuit board 5 as the protrusion 13, the problems (A) and (B) described above can be solved. It can be solved. In FIG. 5, the flexible circuit board 5 can be mounted on one side or both sides.
When the mounting surface of the circuit component is the surface opposite to the liquid crystal display panel 1, as shown in FIG. 6, a through hole is provided in the flexible circuit board 5, and the circuit component 16 mounted on the flexible circuit board 5 is mounted. What is necessary is just to make it penetrate this through-hole and to protrude to the flame | frame 2 side.
It should be noted that a dedicated component can be used instead of the circuit component 16 described with reference to FIGS. 5 and 6, reference numeral 20 denotes solder.
Furthermore, as shown in FIG. 7, the protrusion 13 may be formed on the flexible circuit board 5 from the beginning.

[Example 2]
FIG. 8 is a cross-sectional view showing a cross-sectional structure of an organic EL display device according to Example 2 of the present invention.
The organic EL display device of this embodiment uses an organic EL display panel 15 in place of the liquid crystal display panel 1 of the above-described embodiment. Therefore, in this embodiment, the optical sheet group (for example, the upper diffusion sheet, the lens sheet, the lower diffusion sheet, etc.) 9, the light guide plate 8, and the reflection sheet 6 are omitted. Since the other points are the same as those of the first embodiment, the description thereof will be omitted.
Also in this embodiment, when a part of the flexible circuit board 5 is bent and disposed on the back side of the frame 2, the protrusion 13 provided on the flexible circuit board 5 is inserted into the hole 14 provided on the frame 2. By inserting, the springback force can be supported at that position.
Thereby, not only the action of floating the organic EL display panel 15 can be reduced, but also the floating of the flexible circuit board 5 generated on the opposite side of the frame 2 from the organic EL display panel 15 can be reduced. The outer frame 12 may be omitted.
Further, in this embodiment, a reflective liquid crystal display panel can be used instead of the organic EL display panel 15. In this embodiment, when a reflective liquid crystal display panel is used, a front light may be arranged on the front surface (observer side) of the reflective liquid crystal display panel.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is sectional drawing which shows the cross-section of the liquid crystal display module of Example 1 of this invention. It is sectional drawing which shows a structure at the time of attaching an outer frame to the liquid crystal display module of the state shown in FIG. It is a figure explaining an example of the formation position of the hole part shown in FIG. It is a figure explaining the other example of the formation position of the hole part shown in FIG. It is a figure for demonstrating an example of the formation method of the projection part shown in FIG. It is a figure for demonstrating the other example of the formation method of the projection part shown in FIG. It is a figure for demonstrating the other example of the formation method of the projection part shown in FIG. It is sectional drawing which shows the cross-section of the organic electroluminescent display apparatus of Example 2 of this invention. It is an expansion | deployment perspective view which shows schematic structure of the conventional liquid crystal display module used as display parts, such as a mobile telephone. It is a figure which shows the structure on the back surface side of the flame | frame and liquid crystal display panel which are shown in FIG. FIG. 10 is a top plan view of the frame and the liquid crystal display panel shown in FIG. 9. It is sectional drawing which shows the cross-section along an A-A 'cutting line shown in FIG. FIG. 13 is a cross-sectional view showing a configuration when an outer frame is attached to the liquid crystal display module in the state shown in FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Frame 3, 4 Semiconductor chip 5 Flexible circuit board 6 Reflective sheet 7, 16 Circuit component 8 Light guide plate 9 Optical sheet group 10 Spacer 11 Double-sided tape 12 Outer frame 13 Protrusion part 14 Hole part 15 Organic EL display panel 20 Solder TFT, CF glass substrate POL1, POL2 Polarizing plate

Claims (2)

A display panel;
A backlight disposed on the back of the display panel;
A holder for accommodating the display panel and the backlight;
A display device comprising a flexible circuit board connected to the first side of the display panel,
The holder has a hole opening at least on the opposite side of the display panel in the vicinity of the first side of the display panel;
The flexible circuit board is bent and partially disposed on the back surface of the holder, and has a protrusion inserted into the hole,
The protrusion is mounted on the flexible circuit board from the side opposite to the holder, and a part of the protrusion penetrates a through hole formed in the flexible circuit board and is inserted into the hole. Viewing equipment you. The display device according to claim 1 , wherein the flexible circuit board is a circuit board on which an electronic component is mounted on one side.

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