JPS63128520A - Plasma display device - Google Patents

Abstract

PURPOSE:To reduce a leakage oscillation sound amplitude by retaining a sound shield plate with a gap interposed to a plasma display panel PDP at the outside of the PDP mounted on a display window part of a housing body. CONSTITUTION:A sound shield plate 5 contributing to a sound shielding and making a visible radiation permeative is positioned in the central part of PDP with at least a space gap 8 interposed to a PDP 1, and the sound shielding plate 5 is retained softly only in a panel peripheral part via a material even if touched the PDP 1. This results in very small vibration through a sound vibration is transmitted to the housing body 4 having a larger mass and difficult to vibrate via a supporting material 2 having a buffer property and retaining a PDP end part little in vibration. And a force directly vibrating the sound shield plate 5 is small as the sound shield plate 5 is installed in the panel front surface which is a vibration surface via the gap 8. This results in a very small amplitude of the vibration of the sound shield plate.

Description

[Detailed Description of the Invention] [Summary] The present invention eliminates the oscillation noise that sometimes appears from PDPs, which is caused by the harmonics of the panel's mechanical resonance frequency coinciding with the electrical drive frequency, which is thought to be due to electro-mechanical effects. This article describes a PDP device that stipulates a panel mounting method to reduce the slight audible sound that occurs.

[Industrial application field]

This invention is a technology required for a plasma display device, which is one of the information display devices installed in a quiet place.

When a plasma display device is installed in a quiet place, even the slightest oscillation noise from the device becomes an annoying noise.
It may discourage people around the device. In such cases, the improvement of the device according to the present invention becomes very effective in protecting a quiet environment.

[Conventional technology]

In conventional plasma display devices, nothing is attached to the front of the PDP, or a transparent plate is simply attached to the panel to prevent mechanical damage to the panel surface, or a transparent plate is attached to the front of the panel to prevent scattered light from the surroundings. Either the contrast enhancement plate to be removed was attached in contact with the panel.

[Problem that the invention seeks to solve]

However, as the application of plasma display devices becomes more widespread and the plasma display devices are installed in quiet offices, such as hospitals, libraries, and laboratories, there is a high probability that this device will also be used because of its convenient and easy-to-read display. A problem arose in that the minute oscillating noises sometimes emitted from the P interfered with other work.

The problem to be solved by the present invention is to reduce the amplitude of the leakage oscillation sound.

[Means for solving problems]

The sound shielding plate is placed at a small distance from the center of the PDP, for example, 2
The two PDPs are mounted in parallel with flI apart, and the other PDP is mounted so as to be acoustically lifted from the housing. That is, the sound shielding plate is separated from the PDP and attached to the front side of the panel, which is the window side of the housing, and the PDP is attached to the housing with a gap between the sound shielding plate and the PDP, or is attached to the housing via a cushioning member. Or, the peripheral part of the PDP and the sound shielding plate are integrally attached via a soft material that serves as a cushion,
The peripheral portion of this PDP is attached to a housing via a cushioning member.

[For production]

The vibration energy of the minute oscillating sound generated by the PDP is consumed in vibrating the air in contact with the outside of the panel, and it is extremely difficult to make the sound shielding plate, which is large in rigidity and mass, vibrate from this vibrating air. , the amplitude of vibration of the sound shielding plate becomes extremely small.

〔Example〕

An embodiment of the invention is shown in FIG.

Reference numeral 1 designates the PDPJ 2 as a support material with cushioning properties, 3 as a mounting member thereof, 4 as a housing, 5 as a sound shielding plate, and 6 as a window portion opened in the housing.

The PDP I is attached to a housing 4 using a support material 2 having cushioning properties and a mounting member 3.

On the other hand, the sound shielding plate 5 is attached to the front window part 6 of the housing 4,
It is separated from PDP I by a gap 8.

In this way, sound vibrations are transmitted to the casing 4, which has a large mass and is difficult to vibrate, via the cushioning support material 2 that holds the ends of the PDP, which have little vibration, but the vibrations become extremely small.

Further, since the sound shielding plate 5 is attached to the front surface of the panel, which is the vibration surface, through a gap, the force that directly vibrates the sound shielding plate 5 is small.

Further, FIG. 2 shows another embodiment of the present invention, in which a sound shielding plate 5
is the spring via the cushion material 7)L? It is attached to 1.

The PDP is attached through a cushioning material 7 that absorbs vibrations at the end where the noise amplitude is small.
Almost no vibration is transmitted to the sound shielding plate 5.

Since the PDP 1 and the sound shielding plate 5 do not touch at the center where sound vibrations are large, but only at the ends, it can be said that almost no vibration is transmitted as described above.

It goes without saying that the sound shielding plate 5 of the present invention may be used in common with a contrast enhancement plate or a scratch-prevention transparent plate that is attached to the window of the display section of a plasma display device for a different purpose.

〔Effect of the invention〕

To attach the PDP to the housing 4, a sound shielding plate 5 that can contribute to sound shielding and transmit visible light is placed in the window 6 at least at the center of the PDP with a space gap 8 between the PDP and the PDP, and is in contact with the PDP. However, the key point of the present invention is that the sound shielding plate is held through a soft material only at the periphery of the panel.

Additionally, the casing that includes the display window has a much larger mass.
Since it is in contact with a desk, etc., which seems to have a much lower inter-resonant wave number, it becomes a big force in damping vibrations from the PDP.

Furthermore, even if it is in contact with the panel, it is only in the periphery of the panel where the amplitude is small, which reduces the vibration of the real sound shielding plate.

Furthermore, when the sound shielding plate and the peripheral area of the PDP are directly attached, a soft material is used between them to absorb the vibration energy, so the force that causes the sound shielding plate to vibrate is extremely small. Become.

The contrast enhancement plate and scratch prevention transparent plate attached to the display window of current plasma display devices are also effective in preventing leakage of the oscillation sound, but the present invention has a great effect on attaching them with a gap from the PDP. exists.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the PDP device of the present invention. FIG. 2 is a sectional view of another embodiment of the present invention; FIG. 3 is a sectional view of a conventional PDP device. In the figure, 1 is PDP. 2 is a supporting material with cushioning properties; 4 is the housing; 5 is a sound shielding plate, 7 is cushioning material, 8 is a gap. The pattern on the first page

Claims (1)

[Claims] A display device incorporating a plasma display panel (hereinafter abbreviated as PDP) in a housing, characterized in that a sound shielding plate is held on the outside of the PDP attached to the display window of the housing, with a gap between the PDP and the PDP. plasma display device.