JPH09127879A - Display device - Google Patents

Abstract

(57) Abstract: A display device in which a display panel (1) and a backlight (2) for irradiating light to the display panel (1) are overlapped and fixed to a housing (3) without reducing the mechanical strength of the display device. The purpose is to reduce the number of parts to be assembled and to simplify the assembly process. SOLUTION: The display panel 1 and the backlight 2 are configured to be superposed with a plate-shaped transparent rubber 5 interposed therebetween.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a display device.
Since a display panel used in a thin flat display device such as a liquid crystal display device is made of plate-shaped glass, it takes a lot of time to handle the display panel, which has been a factor of increasing the assembly cost of the display device. In recent years, the display panel has become larger in area and has become more difficult to handle, and it is desired to simplify the assembly process without lowering the mechanical strength.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view of a conventional liquid crystal display device, and FIG. 8 is an exploded perspective view showing a state of assembling various parts constituting the liquid crystal display device. 7 and 8, 1 is a display panel, 2 is a backlight, 3 is a housing, 4 is a holding frame, and 6 is a bar-shaped rubber. The display panel 1 is composed of glass plates stuck together and liquid crystal sealed in the gaps, and displays information such as characters in a predetermined area on the display surface. The backlight 2 converts light emitted from a linear light source such as a fluorescent tube into planar light using a reflection plate or a diffusion plate and irradiates the display panel 1 with the light.

FIGS. 9 (a) and 9 (b) are perspective views showing the structure of a conventional backlight. Different systems are used to convert linear light into planar light. . FIG.
In the configuration shown in (a), a plurality of fluorescent tubes 10 are arranged side by side between the plate-shaped reflecting plate 11 and the diffusing plate 12, and each fluorescent tube 10
The diffused plate 12 scatters the light emitted from the device to obtain uniform planar light. Further, in the configuration shown in FIG. 9B, the fluorescent tube 10 is arranged on the side end surface of the light guide plate 13, the reflection plate 11 is provided on one main surface of the light guide plate 13, and the diffusion plate 12 is provided on the other main surface. The light emitted from the fluorescent tubes 10 is superposed and guided to the inside of the light guide plate 13 from the side end surface of the light guide plate 13 and then scattered by the diffusion plate 12 to obtain uniform planar light.

The housing 3 is for fixing components such as the display panel 1 and the backlight 2. A frame-shaped wall for accommodating these parts is provided on the peripheral portion of the housing 3, and is formed by injection molding of resin. The holding frame 4 is provided with L-shaped claws on the side surface of the frame portion, and is made of metal such as stainless steel. In addition to the above components, components such as a drive printed circuit board are incorporated in the liquid crystal display device, but they are omitted for simplicity.

In the liquid crystal display device, the display panel 1 itself does not have a light emitting function, and receives uniform plane light emitted from the backlight 2 and modulates it to display information such as characters. Therefore, at the time of assembly, the display panel 1 and the backlight 2 are superposed on each other on their opposing surfaces and fixed to the housing 3, so that the backlight 2 directly irradiates the display panel 1 with planar light. Moreover, since the display panel 1 is made of a plate-shaped glass plate, it is necessary to interpose a cushioning material to relieve the mechanical stress when the display panel 1 and the backlight 2 are overlapped with each other. Between the backlights 2, the light emitted from the backlight 2 to the display panel 1 must be arranged in the peripheral portion so as not to affect the light. Therefore, at the time of assembly, as shown in FIG. 8, the display panel 1 and the backlight 2 are placed on the bottom surface of the housing 3 in such a manner that they are overlapped with each other with the rod-shaped rubber 6 interposed as a cushioning material in the peripheral portion thereof. further,
The peripheral edge of the upper surface of the display panel 1 is also fitted into the frame portion of the holding frame 4 with a similar rod-shaped rubber 6 interposed. And the display panel 1
The rod-shaped rubber 6 is compressed by pressing the peripheral edge of the holding frame 4 and the L-shaped claws provided on the holding frame 4 are bent and fixed inward on the back side of the housing 3 in this state. .

[0006]

As described above, in the conventional display device, when the display panel and the backlight are overlapped and fixed to the housing, the stick-shaped rubber is arranged and held as a cushioning material on the peripheral portion of the display panel. A mechanism for pressing the peripheral portion with a frame has been used.

However, as the area of the display panel increases,
A mechanism that only presses the peripheral edge is not sufficient to fix the display panel, and a positional shift easily occurs between the display panel and the backlight due to an external mechanical shock or the like, and the reliability of the display device deteriorates. I was afraid. In order to prevent such troubles, conventionally, a holding frame is used to apply as much pressing force as possible to the peripheral edge of the display panel, and as a pressing mechanism for that, as described in the section of the prior art, the holding frame is used. A complicated and laborious assembling method such as bending and fixing the provided L-shaped claws inward on the back surface side of the housing is used, which causes a problem of increasing the assembly cost.

Further, conventionally, a bar-shaped rubber is arranged on each side of the peripheral edge of the display panel as a cushioning material, but there is a problem that it takes time to handle it. Although it is possible to reduce the number of parts by using a frame-shaped rubber that matches the peripheral dimension of the display panel instead of the rod-shaped rubber, the frame-shaped rubber has an unstable shape and is easily deformed. There is no change in that it is difficult and time-consuming to accurately align and arrange the peripheral portion of the.

Further, since the parts themselves such as the display panel and the backlight are also composed of a large number of constituent elements, a large number of man-hours are required for assembling them, which raises a problem of increasing the total assembling cost.

Therefore, an object of the present invention is to reduce the number of parts to be assembled and to simplify the assembly process without lowering the mechanical strength of the display device.

[0011]

A solution to the above problems is a display device in which a display panel and a surface light source for irradiating light to the display panel are overlapped and fixed to a housing. A display device characterized by being superposed via a plate-shaped transparent elastic body, or a display device in which a display panel and a surface light source for irradiating the display panel are superposed and fixed to a housing. A display device characterized in that the surface light source includes a plate-shaped transparent elastic body arranged to face the display panel, and a linear light source arranged on a side end surface of the plate-shaped transparent elastic body, or In the above display device, at least a part of the main surface of the plate-shaped transparent elastic body is roughened, or in the display device, the main surface of the plate-shaped transparent elastic body is Mirror on at least part of the surface Display device, or characterized in that it is of, in the display device, is achieved by a display device, characterized in that the frame-shaped wall is provided on the periphery of the plate-shaped transparent elastic body.

With the above structure, the plate-like transparent elastic body disperses and relaxes mechanical stress applied to the display panel in a planar manner without affecting the light emitted from the surface light source to the display panel. . Therefore, the display panel can be fixed more stably than the conventional one without deteriorating the display performance. Further, the assembly process is simplified as compared with the case where the bar-shaped rubber is arranged on each side of the display panel.

Further, since the roughened area of the plate-shaped transparent elastic body has a function of scattering light, the light emitted from the surface light source is made more uniform when passing through the plate-shaped transparent elastic body. Performance is improved. Further, since the diffuser plate, which is a component of the surface light source, can be used in place of the conventional diffuser plate, the structure can be simplified.

Further, when the mirror-finished surface of the plate-shaped transparent elastic body is overlapped with other parts such as a surface light source, the adhesion between them is improved, so that the display panel is more firmly fixed.

Further, when at least a part of the main surface of the plate-shaped transparent elastic body is roughened and a linear light source is arranged on the side end surface, the light emitted from the linear light source emits light of the plate-shaped transparent elastic body. The light travels from the side end surface toward the inside of the plate-like transparent elastic body, and is scattered by the roughened main surface to illuminate the display panel. According to this configuration, the plate-shaped transparent elastic body has both the functions of the light guide plate and the diffusion plate used in the conventional surface light source. Therefore, the light guide plate and the diffusing plate used in the conventional surface light source are not required, and the structure is simplified.

Further, the frame-shaped wall provided on the peripheral portion of the plate-shaped transparent elastic body prevents the positional displacement of the display panel and protects the side end surface of the display panel from a mechanical shock from the outside. Improves reliability.

[0017]

1 is a cross-sectional view of a liquid crystal display device showing an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the arrangement of parts at the time of assembling the liquid crystal display device, and FIGS. Those having the same functions as those shown in are attached with the same numbers. Reference numeral 5 denotes a plate-shaped transparent rubber which is used as a cushioning material in place of the conventional rod-shaped rubber 6 and is formed by curing an elastic body such as transparent silicon resin or potting resin using a plate-shaped mold. An arrow-shaped claw is provided on the side surface of the holding frame 4 in place of the conventional L-shaped claw, and the housing 3 is not provided with a frame-shaped wall and has a simple plate-shaped configuration.
This plate is provided with a hole for inserting the above-mentioned arrow-shaped claw.

The liquid crystal display device is assembled as follows. That is, the backlight 2 is arranged on the bottom surface of the housing 3, and the display panel 1 is superposed on the backlight 2 with the plate-shaped transparent rubber 5 interposed therebetween. Then, the peripheral edge of the upper surface of the display panel 1 is fitted into the frame portion of the holding frame 4 via the rod-shaped rubber 6, and in this state, the holding frame 4 is pressed from above to form an arrow-shaped nail in the hole provided in the housing 3. insert. Since the bar-shaped rubber 6 and the plate-shaped transparent rubber 5 are compressed and deformed by the pressing force applied from the holding frame 4, an elastic force that pulls back upward is generated in the arrow-shaped claw, and this elastic force causes the housing 3 to move. On the other hand, the arrow-shaped nail is fixed.

As described above, in the present invention, since the entire surface of the display panel 1 is in close contact with the plate-shaped transparent rubber 5 and overlapped with the backlight 2, the arrow-shaped nail is provided in the housing 3. It can be prevented from being displaced due to an impact from the outside by fixing it by a simple method such as inserting it in the.

Further, as shown in FIG. 3, when a frame-shaped wall is provided on the peripheral portion of the plate-shaped transparent rubber 5 and the display panel 1 is arranged inside the frame-shaped wall, the side end surface of the display panel 1 is also machined from the outside. Can be protected from physical shock. Providing such a frame-shaped wall on the plate-shaped transparent rubber 5 can also be applied to the embodiments described below.

Although the bar-shaped rubber 6 is interposed between the display panel 1 and the holding frame 4 in the above embodiment, the bar-shaped rubber 6 can be replaced with a plate-shaped transparent rubber. next,
When the main surface of the plate-shaped transparent rubber 5 used in the above-described embodiment is roughened and the roughened surface is arranged so as to face the backlight 2, the light emitted from the backlight 2 will cause the plate-shaped transparent rubber 5 to travel. As it is scattered by the roughened surface when passing,
Since the display panel 1 is irradiated with more uniform light, the uniformity of display brightness is improved. In this case, the main surface of the plate-shaped transparent rubber 5 may be roughened over its entire surface, or the display area 8 on the display surface of the display panel 1 as shown in FIG.
When is in a fixed position, the light use efficiency can be improved by setting only the portion corresponding to the display area 8 as the roughened area 9.

The roughened area 9 is formed by subjecting the main surface to fine and irregular asperity processing by a mat treatment, or, as shown in FIG. 5, the main surface is processed into a rhythm. The same effect can be obtained in any shape.

On the contrary, if the main surface of the plate-shaped transparent rubber 5 is mirror-finished and the mirror-finished surface is arranged so as to face the display panel 1 or the backlight 2, the display panel 1 or the backlight 2 is closely attached. As a result, the display panel 1 can be more stably fixed.

Since the plate-shaped transparent rubber having a roughened surface has a function of scattering light as described above, the number of parts to be assembled can be reduced by utilizing this. For example,
When the diffuser plate 12 of the backlight shown in FIGS. 9 (a) and 9 (b) is replaced with a plate-shaped transparent rubber having a roughened surface and is overlapped with the display panel, the light emitted from the fluorescent tube 10 is plate-shaped. Since the display panel is illuminated by being scattered by the roughened surface of the transparent rubber, the conventional diffuser plate can be eliminated and the structure thereof can be simplified.

Next, FIG. 6 shows an example in which the structure of the liquid crystal display device is further simplified by using a plate-shaped transparent rubber. As shown in the drawing, when the fluorescent tube 10 is arranged on the side end surface of the plate-shaped transparent rubber 5 and the surface on the side where the plate-shaped transparent rubber 5 contacts the display panel 1 is roughened, the fluorescent tube 10 emits light. The light is guided from the side end surface of the plate-shaped transparent rubber 5 to the inside, is scattered by the roughened main surface, and illuminates the display panel 1. According to this configuration, the plate-shaped transparent rubber 5 is provided in the display panel 1
In addition to the function as a cushioning material when superposed with
Since the functions of the light guide plate 13 and the diffusion plate 12 shown in (b) are also provided, the number of parts can be reduced and the assembly process can be simplified.

[0026]

As described above, according to the present invention, the number of parts for assembling the display device is reduced, the assembling process is simplified, and the display panel can be fixed more stably than in the past, so that a large area can be obtained. It is useful for improving the mechanical strength of the display device having the display panel and reducing the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a liquid crystal display device showing an embodiment of the present invention.

FIG. 3 is a perspective view of a plate-shaped transparent rubber showing an embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a liquid crystal display device showing an embodiment of the present invention.

FIG. 5 is a perspective view of a plate-shaped transparent rubber showing an embodiment of the present invention.

FIG. 6 is a sectional view of a liquid crystal display device showing an embodiment of the present invention.

FIG. 7 is a sectional view of a conventional liquid crystal display device.

FIG. 8 is an exploded perspective view of a conventional liquid crystal display device.

FIG. 9 is a perspective view of a conventional backlight.

[Explanation of symbols]

1 Display Panel 8 Display Area 2 Backlight 9 Roughened Area 3 Housing 10 Fluorescent Tube 4 Holding Frame 11 Reflector 5 Plate Transparent Rubber 12 Diffuser 6 Rod Rubber 13 Light Guide 7 Glass Plate

Claims (5)

[Claims] 1. A display device in which a display panel and a surface light source for irradiating light to the display panel are stacked and fixed to a housing, wherein the display panel and the surface light source are stacked via a plate-shaped transparent elastic body. A display device characterized by being provided. 2. A display device in which a display panel and a surface light source for irradiating light to the display panel are overlapped and fixed to a housing, wherein the surface light source is a plate-like member arranged to face the display panel. A display device comprising a transparent elastic body and a linear light source arranged on a side end surface of the plate-shaped transparent elastic body. 3. The plate-shaped transparent elastic body has a roughened surface in at least a part of its main surface.
Or the display device according to 2. 4. The main surface of the plate-shaped transparent elastic body is mirror-finished in at least a partial area.
Or the display device according to 2. 5. The display device according to claim 1, wherein a frame-shaped wall is provided at a peripheral portion of the plate-shaped transparent elastic body.