KR100720588B1 - A front filter of plasma display panel which functions as an antenna - Google Patents

Abstract

The present invention relates to a front filter of a plasma display panel performing an antenna function.

The present invention provides a front filter of a plasma display panel, comprising: a base film; And at least one electrode formed on the base film and receiving at least one broadcast signal.

Therefore, according to the present invention, the front filter of the plasma display panel functions as an antenna, thereby saving cost and volume of the product.

PDP, front filter, UWB antenna

Description

A front filter of plasma display panel which functions as an antenna

1A to 1B are diagrams illustrating an electromagnetic shielding film of a front filter of a conventional plasma display panel.

2A to 2B show a conventional patch type UWB antenna.

3A is a plan view of a front filter of a plasma display panel having an antenna function according to the present invention;

3b is a graph showing antenna characteristics of a plasma display panel having an antenna function according to the present invention;

<Explanation of symbols for the main parts of the drawings>

100: base film 105: frame

110: conductive mesh 200: dielectric

210: electrode 300: base film

310: electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), which is one of new image display devices in the multimedia era, and more particularly to a front filter of a PDP.

The biggest feature of PDP is that it can be made thinner than 10cm compared with the same self-emitting CRT (Cathode-ray tube), and it is easy to manufacture flat large screen (60 ~ 80inch), and also it can be used in style or design. ), It is clearly distinguished from the conventional CRT. PDP is thin, light, self-luminous and enables real-time, realistic images, simple structure, and easy to produce large-screen flat panel display, and has been qualified for high definition television (HDTV) since early. .

The top plate of the PDP is provided with a front filter to block electromagnetic waves and reflect light incident from the outside. The front filter includes a color correction film, a near infrared ray shielding film, an electromagnetic interference shielding film, and an anti-reflection film, and recently, a material for performing the functions of the respective films in the adhesive layer. There is an effort to reduce the thickness of the front filter by including a.

FIG. 1A is a plan view illustrating an electromagnetic wave shielding film of a front filter of a conventional PDP, and FIG. 1B schematically illustrates a cross section of the electromagnetic shielding film of a front filter of a PDP. Referring to FIGS. 1A to 1B, an electromagnetic shielding film of a conventional front filter of a PDP is as follows.

EMI shielding film of the front filter of the PDP according to the prior art is provided with a conductive mesh (Mesh, 110) on the upper surface of the base film 100, the conductive mesh 110 is supported by the frame 105. The conductive mesh 110 is formed by patterning a metal layer using silver (Ag), copper, copper, or ITO (Indium-Tin-Oxide) by a photolithography process and an etching process. The electrode lines have a structure in which they cross each other.

The manufacturing process of the EMI shielding film of the front filter of the PDP is described in detail as follows. First, a metal thin film is formed on the base film 100, and a photoresist is applied on the metal thin film. Subsequently, the photoresist is patterned using a mask to form a photoresist pattern in the form of a frame and a mesh. Subsequently, by patterning a metal thin film using the photoresist pattern of the mesh form, a frame 105 and a conductive mesh 110 are formed on the base film 100 as shown in FIG. 1B, and the remaining photoresist pattern is stripped. Removed by process.

Meanwhile, with the development of mobile communication technology, a wireless transmission / reception module for transmitting high capacity data has been developed, and accordingly, the role of an antenna has become important. In particular, the UWB (Ultra Wide Band) communication technology, which is a field of a pan-personal access network that transmits data at low power in the band of 3 to 10 GHz, has been in the spotlight. UWB has a limitation (-43dB) of transmit and receive power due to Federal Communications Commission (FCC) regulations. Therefore, due to the characteristics of low transmission and reception power, the transmission and reception sensitivity of the antenna is greatly affected by the data transmission through the wireless network.

Conventionally, a microstrip antenna, which is widely used as an antenna, uses a metal pattern on a dielectric to induce resonance at a desired frequency.

2A is a diagram schematically showing a plane of a conventional patch-type UWB antenna, and FIG. 2B is a diagram schematically showing a cross section of a conventional patch-type UWB antenna. Referring to Figures 2a to 2b one embodiment of a conventional patch-type UWB antenna as follows.

An electrode 210 is formed on the dielectric 200, and the electrode 210 has a length of 1/2 of a frequency wavelength. The electrode 210 may have a curved shape, but may be straight or circular, and the entire length may have half the frequency wavelength of a signal to be received.

However, the above-described conventional antenna has the following problems.

Conventional antennas have to have a separate antenna device when used in a display or a mobile communication device such as a PDP, PDA, mobile phone, there is a problem such as increased cost and space constraints.

The present invention is to solve the above problems, it is an object of the present invention to provide a front filter of a plasma display panel having an antenna function.

In order to achieve the above object, the present invention is a front filter of the plasma display panel, the base film; And at least one electrode formed on the base film and receiving at least one broadcast signal.

Recently, interest in UWB (ultra wide band) wireless technology that can share the frequency without mutual interference with narrowband and broadband systems such as mobile communication, satellite communication, broadcast for efficient use of limited frequency resources It is rising. UWB technology is emerging as a new wireless technology that can be used without permission because of its relatively low spectral power density distribution over a much wider bandwidth than conventional wireless systems.

UWB technology has the advantage of being difficult to tap and monitor, high-speed transmission, distance measurement, and low-cost implementation, and thus may be widely used in wireless communication or radar technology.

The FCC defines a UWB system as a system with a partial bandwidth of 20% or more of the center frequency or an RF bandwidth of 500 MHz or more, and limits the upper and lower frequencies of the bandwidth to -10dB. Since the UWB system was developed, many UWB antennas have been developed for military purposes. Many antennas have been developed for GPR and other military radar radars such as TEM horns, spiral antennas, logarithmic antennas, and tapered slot antennas (TSAs). .

However, since the antennas are large in size and antennas except for the TEM horn are distributed in impulse response characteristics, they are unsuitable for recent indoor communication UWB systems. Therefore, in recent years, the antenna for the UWB system is mainly researched into a small, lightweight flat antenna or a monopole or dipole antenna.

The front filter of the PDP according to the present invention is characterized in that the electromagnetic shielding film is manufactured to perform the antenna function. That is, instead of the conductive mesh formed on the base film, it characterized in that at least one electrode for receiving a broadcast signal is formed. In this case, the at least one electrode should have a length of 1/2 or 1/4 of the wavelength of the broadcast signal to be received. In addition, the electromagnetic shielding film is to perform the function of the antenna, the rest of the configuration is the same as the front filter of the conventional PDP.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. The same components as in the prior art are given the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

3A is a plan view of a front filter of a plasma display panel having an antenna function according to the present invention. Referring to FIG. 3A, a first embodiment of a front filter of a plasma display panel having an antenna function according to the present invention will be described.

At least one electrode 310 is provided on the base film 300, and the electrode 310 serves to receive a broadcast signal. In the case of a monopole antenna, the antenna 310 should be grounded and have a length of 1/4 of the broadcast signal wavelength. In the case of a dipole antenna, the antenna is not grounded. It should have a length of 1/2 of the broadcast signal wavelength. The monopole antenna has a length of 1/4 of the broadcast frequency wavelength because of the characteristics of the antenna using a resonance phenomenon. Resonance refers to a phenomenon in which an antenna transmits and receives radio waves of a certain wavelength most effectively. When the length of the antenna is an integer multiple of 1/2 of the wavelength, the antenna resonates, and the lowest frequency among the frequencies of the antenna This is called the resonance frequency.

3A is provided with a plurality of electrodes 310 in two stages, the number of the electrodes 310 is at least one or more, but the larger the number, the better the reception efficiency of the broadcast frequency. Accordingly, circular and the like may be used in addition to the straight line as shown in FIG. 3A, but each length is sufficient if each length is 1/2 (or 1/4) of the frequency wavelength. However, since the front filter having the antenna function according to the present invention performs the function of the electromagnetic shielding film, it is preferable that the electrode 310 has a compact shape as shown in FIG. 3A.

Since the electrode 310 should be included in the front filter of the PDP to transmit light, the electrode 310 should be very thin in diameter, preferably a transparent electrode, and more preferably indium tin oxide (ITO). . In addition, when the front filter of the PDP having the antenna function is used in a mobile communication device or the like, the antenna function will be used to receive a communication signal rather than a broadcast signal.

When the near-infrared shielding film, the color correction film, the anti-reflective film, etc. are bonded to the base film 300 provided with the electrode 310 shown in FIG. 3A with an adhesive, the performance of the front filter of the PDP will be further improved.

3B is a graph showing antenna characteristics of a plasma display panel having an antenna function according to the present invention. Referring to Figure 3b describes the operation of the front filter of the PDP having an antenna function according to the present invention.

In FIG. 3B, the vertical axis represents a parameter representing the degree of reflection of the broadcast signal incident on the front filter of the PDP in dB units, and the horizontal axis represents the frequency of the broadcast signal. In the period between 3 and 10 GHz in FIG. 3B, the reflected broadcast signal is sharply reduced, which means that the broadcast signal is relatively absorbed by the front filter of the PDP according to the present invention. Therefore, it is more preferable to receive a broadcast frequency of a single band UWB which transmits the 3.1 GHz to 10.6 GHz band in a short pulse.

The present invention is not limited to the above-described embodiments, and such modifications are included within the scope of the present invention even though modifications may be made by those skilled in the art to which the present invention pertains.

The effect of the front filter of the PDP having the antenna function according to the present invention described above is as follows.

In the front filter of the plasma display panel having the antenna function according to the present invention, since the electromagnetic shielding film performs the function of the antenna, it is not necessary to provide a separate antenna, thereby saving cost and space.

Claims (5)

delete Base film; And A front surface of the plasma display panel having an antenna function, which is formed on the base film to receive a broadcast signal, has a length of 1/4 of the broadcast signal wavelength, and includes a monopole electrode. filter. Base film; And The front surface of the plasma display panel having an antenna function, which is formed on the base film to receive a broadcast signal, has a length of 1/2 of the broadcast signal wavelength, and comprises an electrode having a dipole shape. filter. The method of claim 2 or 3, wherein the electrode, The front filter of the plasma display panel having an antenna function, characterized in that the transparent electrode. The method of claim 2 or 3, wherein the electrode, An ITO (Indium-Tin-Oxide) electrode, the front filter of the plasma display panel having an antenna function.

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