The present invention relates to a luminescent device, and in particular to a flat luminescent device made of field emission device.
As the rapid developments of the optoelectronic products, the applications of the flat luminescence are more and more popular. Generally, the flat luminescence is known to be widely used for the flat panel display, the illumination application, and the indication application etc. However, most of the typical flat luminescent devices are constructed from the non-flat lighting source incorporated with a plurality of purposeful optical components. For example, the flat luminescence of the back light module for the liquid crystal display (LCD) is mainly formed by a strip-shaped cold cathode fluorescent lamp (CCFL) incorporated with a plurality of purposeful optical components, such as the light guide plate, the brightness enhancement film and the light diffusion film for converting the striped light into the flat luminescence. However, with the incorporation of such purposeful optical components, the intensity of the light will be sequentially decreased by each of the purposeful optical components when passing through or reflecting from those optical components. Therefore, the traditional flat luminescent devices not only have the problem in complicated assembly of the expensive optical components, but also have the trouble in brightness degradation.
Recently, due to the rapid development of the LCD TV, the demand for the flat luminescence is also increased rapidly. However, the display quality of the LCD TV is usually constrained by the brightness degradation of the flat luminescent device. In addition, the design of the thin type LCD TV is also constrained by the complicated assembly of the traditional flat luminescent device. Accordingly, it is necessary to develop a novel thin type flat luminescent device with higher brightness and lower power consumption for the LCD TV. It is well known that the field emission luminescent device is one of the promising flat luminescent devices that could be widely used for LCD TV. Comparing with the traditional flat luminescent device constructed by the strip-shaped CCFL, the field emission luminescent device not only has a thinner and simpler structural design, but also has the advantages in higher brightness and lower power consumption. Furthermore, the field emission luminescent device is not only applicable for the LCD as the backlight module but also suitable for the lighting system, the decoration light, and indication light.
Although the field emission luminescence has been developed for a long time, it also has some issues that should be overcome before being mass manufactured. First, the manufacturing process of the field emission luminescent device could be very elaborate and costly if it is carried out through the semiconductor process. Second, when the field emission luminescent device operates, the light generated by collision of the electron beam in the fluorescence layer of the field emission luminescent device is always accompanied with the generation of heat, which may cause an additional thermal issue of the field emission luminescent device.
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It is a first aspect of the present invention to provide a novel field emission luminescent device. The field emission luminescent device includes a cathode plate having an electron-emitting source formed thereon for emitting an electron beam, an anode plate including a first side having thereon an anode electrode layer and a fluorescence layer and a second side having thereon a reflection layer, and a vacuum formation structure formed between the cathode plate and the anode plate, in which the electron-emitting source, the anode electrode layer and the fluorescence layer are arranged.
It is a second aspect of the present invention to provide a further field emission luminescent device which includes a first substrate having an electron-emitting source formed thereon for emitting an electron beam, and an second substrate including a first side facing to the first substrate and having thereon an electrode layer and a fluorescence layer and a second side having thereon a reflection layer.
It is a third aspect of the invention to provide a novel method for manufacturing a field emission luminescent device. The manufacturing method includes at least the following steps of (a) providing an anode and a cathode pieces, (b) forming a cathode electrode layer on the cathode piece, (c) sequentially forming an anode electrode layer and a fluorescence layer on one side of the anode piece, and (d) forming a reflection layer on another side of the anode piece.
Preferably, the reflection layer is formed by a deposition process.
Preferably, the deposition process is one selected from a group consisting of a sputtering process, an electroplating process, an electroless deposition process, a vapor deposition process and the combination thereof.
Preferably, the reflection layer is formed by a bonding process.
The above objects and advantages of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed descriptions and accompanying drawings, in which:
The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purposes of illustration and description only; it is not intended to be exhaustive or to be limited to the precise form disclosed.
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Please further refer to FIGS. 3(A) and 3(B), which respectively show the transmission paths of the emitted lights in the conventional field emission luminescent device and the reflection-type field emission luminescent device according to the present invention. As shown in
In a further preferred embodiment of the present invention, the anode plate 10 and the cathode plate 20 are pervious to light. Specifically, the substrates 12, 22 are transparent glass substrates. Moreover, the reflection layer 30 formed on the anode plate could be a metal layer having a relatively high reflection index, so that the power loss of the reflection light can be reduced. Meanwhile, the reflection layer 30 could also be a metal layer having a relatively high thermal conductivity and a relatively high coefficient of thermal expansion, so that the thermal issue and the thermal deformation of the anode plate can be abated. In a further preferred embodiment of the present invention, a heat dissipation device 40, such as the heat sink, the fan, or other cooling system might further be connected on the reflection layer 30, so as to improve the cooling efficiency of the anode plate.
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In a preferred embodiment of the present invention, the reflection layer 30 is formed by a deposition process, such as a sputtering process, an electroplating process, and electroless deposition process or a vapor deposition process. Furthermore, the reflection layer 30 also could be formed by a bonding process.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Number | Date | Country | Kind |
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94131734 | Sep 2005 | TW | national |