The present invention relates to a flat display device, such as a plasma display device using a low-profile, lightweight plasma display panel (hereinafter also referred to as a panel) as a display device.
The panels used for the plasma display devices roughly fall into two types of the alternating current (AC) type and the direct current (DC) type in the aspect of the principle of driving. On the other hand, from difference in discharging, the panels fall into the surface discharge type and the opposing discharge type. In recent years, the surface discharge device having a three-electrode structure has become the mainstream from the reasons of easy fabrication and suitability for increase in resolution and in screen size.
A panel of the surface discharge type has the following structure. Two substrates (where, each substrate has transparency at least on the front side) are oppositely disposed in a manner that a discharge space is formed therebetween. The discharge space is divided into a plurality of compartments by barrier ribs disposed on the substrates. The panel has an electrode array so as to generate a discharge in the discharge space divided by the barrier ribs. The panel has a plurality of discharge cells each of which containing phosphors that emit light of red, green, or blue. The phosphors are excited by vacuum-ultraviolet light with a short wavelength generated by a discharge, by which each discharge cell emits visible light of red, green, or blue. The panel thus provides color display.
Such structured plasma display panel has come under the spotlight particularly among the flat panel display devices. Compared to a liquid crystal panel, the plasma display panel has following advantages: fast-speed display; wide view angle; an easy development to increase in size; high display quality by virtue of self emission. With the structure above, the plasma display device has been widely used, for example, as a display device suitable for the area attracting large crowd or video entertainment for individuals at home.
For instance, Japanese Patent Unexamined Publication No. 2005-331556 introduces a module structure of a plasma display device. According to the structure, a panel mainly made of glass is fixed on the front side of a chassis member of aluminum or other metals. A circuit board including a driver circuit for panel emission is disposed on the back side of the chassis member.
The conventional structures, however, have a pending problem in providing a display device having a sophisticatedly designed exterior cabinet at low cost.
The display device of the present invention has a display module, a metal frame, and an exterior cabinet. The display module contains a display panel and a circuit board on which a driver circuit for displaying image on the panel is mounted. The metal frame is disposed in the periphery of the display panel. The exterior cabinet accommodates the display module. The exterior cabinet has a decorative panel and a back cover. The decorative panel is disposed on a front side of the display panel so as to cover the frame. The back cover covers a back side of the display module. The decorative panel is made of light transmissible colored resin. The decorative panel has an uneven thickness part, where a thickness changes continuously, at a section disposed on the frame.
When light enters through the uneven thickness part of the decorative panel and reflects off the frame, the reflecting amount of light varies depending on the change in thickness of the uneven thickness part. The gradual change in light reflection produces a visual effect with stereoscopic gradation. Further, such a sophisticated design is obtained by a simple structure—the decorative panel with an uneven thickness part exhibiting continuous change in thickness is fixed to the metal frame disposed in the periphery of the panel. The simple structure contributes to a cost-reduced product.
Hereinafter, a plasma display device as the display device of an exemplary embodiment of the present invention is described with reference to the accompanying drawings,
First, the structure of the plasma display panel (hereinafter simply referred to as a panel) of the plasma display device will be described with reference to
A plurality of data electrodes 8 is disposed on rear substrate 2 and insulation layer 7 covers data electrodes 8. On insulation layer 7, grid-like barrier ribs 9 are disposed. Phosphor layer 10 is formed on the surface of insulation layer 7 and on the side surfaces of barrier ribs 9. Front substrate 1 and rear substrate 2 are oppositely disposed to each other in a manner that the display electrode pairs (of scan electrodes 3 and sustain electrodes 4) are located orthogonal to data electrodes 8. The discharge space formed between the two substrates is filled with discharge gas, for example, a gas mixed neon with xenon. The panel does not necessarily have the structure above; barrier ribs 9 may be formed into stripes.
As shown in
On the front side of display panel 20, an optical filter containing electromagnetic shielding filter 24 is disposed. Electromagnetic shielding filter 24 is electrically connected to holding plate 21 via metal frame 25 disposed in the periphery of display panel 20. Frame 25 has opening 25a that conforms to display area 20a of display panel 20. Frame 25 is made of a metal with high brightness, such as aluminum and stainless-steel, and is disposed on display panel 20 so as to cover the non-display area surrounding the display area.
Decorative panel 22 of the exterior cabinet has opening 22a that conforms to display area 20a of display panel 20. Decorative panel 22 is disposed over frame 25 so as to have contact with each other.
Decorative panel 22, as shown in
Display panel 20 is fixed on the front surface of holding plate 21 via sheet 27 having elasticity and thermal conductivity. Further, holding plate 21 is electrically and mechanically connected to metal frame 25 by screw 28. Similarly, back cover 23 of metal is electrically and mechanically connected to metal frame 25 by screw 29.
Metal frame 25 has incised tab 25c on the side surface, whereas decorative panel 22 has hole 22c that meets with tab 25c. Decorative panel 22 is disposed over frame 25 in a manner that incised tab 25c of frame 25 is fitted in hole 22c of decorative panel 22. Thus, decorative panel 22 is tightly attached to frame 25. That is, frame 25 is disposed over decorative panel 22 so as to have contact with each other. Back cover 23 covers the side surface of decorative panel 22 disposed over frame 25.
Hereinafter, the exterior cabinet with a design producing a stereoscopic gradation effect will be described.
Decorative panel 22, as described above, is made of a light transmissible colored resin. Further, decorative panel 22 has uneven thickness part 22b on the front side. Uneven thickness part 22b having continuous change in thickness is formed in a section disposed on frame 25. The front surface of frame 25 has mirror-finished surface 25b at a part that faces uneven thickness part 22b. When light enters into the surface of decorative panel 22, it travels through uneven thickness part 22b and reflects off surface 25b of frame 25, and then comes back through uneven thickness part 22b. At this time, the reflection amount of the coming-back light varies depending on the change in thickness of uneven thickness part 22b. The gradual change in light reflection provides the design of the cabinet with a stereoscopic gradation effect. Adjusting the color density of the colored resin material of decorative panel 22 allows the design to have variations. For example, a resin material of pale color enhances the hard and shiny feel of metal frame 25, whereas a resin material of dark color produces a soft and low-keyed image.
Next, another structure of the plasma display device of the embodiment will be described with reference to
In
As described earlier, the exterior cabinet accommodates the display module. The display module has display panel 20 on the front side of metallic holding plate 21 and the circuit board (not shown) on the back side of holding plate 21. The circuit board contains the driver circuit for displaying image on display panel 20.
On the front side of display panel 20, an optical filter containing electromagnetic shielding filter 24 is disposed. Electromagnetic shielding filter 24 is electrically connected to holding plate 21 via metal frame 25 disposed in the periphery of display panel 20. Frame 25 has opening 25a that conforms to display area 20a of display panel 20. Frame 25 is made of a metal with high brightness, such as aluminum and stainless-steel, and is disposed on display panel 20 so as to cover the non-display area surrounding the display area.
In the periphery section of front panel 30 (i.e., the section disposed over frame 25 so as to cover the non-display area of display panel 20), decorative panel 31 is embedded. Decorative panel 31 is made of a transparent colored resin material. Decorative panel 31 has uneven thickness part 31a on the front side. Decorative panel 31 has uneven thickness part 31a, where a thickness changes continuously, at a section disposed on frame 25. Decorative panel 31 is laid over frame 25 so as to have contact with each other. Besides, frame 25 has mirror-finished surface 25b that faces uneven thickness part 31a of decorative panel 31. With the structure above, when light enters through uneven thickness part 31a of decorative panel 31 and reflects off surface 25b of frame 25, the reflecting amount of light varies depending on the change in thickness of uneven thickness part 31a. The aforementioned structure offers an excellent design having visual effect with stereoscopic gradation.
As described above, the display device of the embodiment has the display module, metal frame 25, and the exterior cabinet for accommodating the display module. The display module contains display panel 20 and the circuit board on which the driver circuit for displaying image on display panel 20 is mounted. The exterior cabinet contains decorative panel 22, 31 on the front side so as to cover frame 25, and back cover 23 that covers the back side of the display module. Decorative panel 22, 31 is made of a light transmissible colored resin. Decorative panel 22, 31 has uneven thickness part 22b, 31a on the front side. Decorative panel 22, 31 has uneven thickness part 22b, 31a, where a thickness changes continuously, at a section disposed on frame 25. When light enters into the surface of decorative panel 22, 31, it travels through uneven thickness part 22b, 31a and reflects off surface 25b of frame 25, and then comes back through uneven thickness part 22b, 31a. At this time, the reflection amount of the coming-back light varies depending on the change in thickness of uneven thickness part 22b, 31a. The gradual change in light reflection provides the design of the cabinet with a stereoscopic gradation effect. Adjusting the color density of the colored resin material of decorative panel 22, 31 allows the design to have variations. For example, a resin material of pale color enhances the hard and shiny feel of metal frame 25, whereas a resin material of dark color produces a soft and low-keyed image.
Although frame 25 is made of aluminum or stainless-steel and has the mirror-finished front surface in the structure of the embodiment, it is not limited to. Frame 25 may be made of a steel plate whose surface is painted or printed by an ink having specularity, or made of a steel plate laminated with a mirror-finished sheet.
Number | Date | Country | Kind |
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2011-121351 | May 2011 | JP | national |