JP4500482B2 - Flat panel display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat panel display device for projecting an image of a television monitor or the like using a TFT liquid crystal panel, a plasma display panel, an EL light emitting panel or the like (hereinafter collectively referred to as a flat panel).
[0002]
[Prior art]
In recent years, display devices that display video have been developed, and liquid crystal televisions using flat panels have become widespread.
In a liquid crystal television, a DC power source is necessary as a drive source (power source) for projecting images. For this reason, in conventional liquid crystal televisions, either a method of converting commercial power, which is an AC power source, to DC power, or a method of supplying power from a secondary battery or a built-in primary battery has been adopted.
[0003]
[Problems to be solved by the invention]
Liquid crystal televisions are widely used as portable televisions because they can be made light and thin. However, when commercial power is used as a power source, a power cord is required, and the degree of freedom of the place where it can be used is limited. Therefore, it has been desired to be cordless.
[0004]
In general home appliances, a secondary battery or a primary battery is generally used as a power source for the purpose of making cordless. However, since a liquid crystal television has a relatively large amount of power consumption, if a secondary battery or a primary battery is used, the battery runs out in a short time, and it is necessary to frequently replace or charge the battery.
[0005]
Accordingly, the present invention provides a flat panel display device such as a liquid crystal television that can be carried and used anywhere, and can be used continuously for a long time without requiring frequent charging even if power consumption is large. The purpose is to do.
[0006]
[Means for Solving the Problems]
The flat panel display device of the present invention, which has been made to solve the above problems, is equipped with a polymer electrolyte fuel cell as a power source.
According to the present invention, the flat panel display device can supply electric power by generating electricity using the mounted fuel cell. Since the fuel cell can continue to generate power if it continues to supply fuel, the power cord of the liquid crystal television can be eliminated, and the energy density per unit volume or unit weight is larger than that of the secondary battery or primary battery. Therefore, the fuel supply frequency can be reduced.
[0007]
The polymer electrolyte fuel cell may be disposed on the back side of the panel cover that supports the flat panel.
Thereby, it is not necessary to take the installation place only for a fuel cell, and it can provide in an inconspicuous place.
[0008]
The polymer electrolyte fuel cell is formed such that a planar polymer electrolyte membrane is sandwiched from both sides by an anode electrode and a cathode electrode, and the polymer electrolyte membrane, anode electrode and cathode electrode cover them. The battery cover surface on the anode electrode side is in contact with the back surface of the panel cover, and the battery cover surface on the cathode electrode side is attached so as to face the back side space of the flat panel display device. It may be.
Further, an opening for heat dissipation, oxygen supply to the cathode electrode, and evaporation of water generated at the cathode electrode may be formed on the battery cover surface on the cathode electrode side.
Thereby, the reaction heat generated at the cathode electrode can be efficiently radiated from the fuel cell so as to escape to the outside air. Moreover, the air required for reaction can be easily taken in from outside air. In addition, water generated by the reaction can be efficiently evaporated.
[0009]
The panel cover and the battery cover may be formed of metal, and may be attached so that the panel cover and the battery cover are in surface contact.
Thereby, the generated heat can be dissipated also to the panel cover side by heat conduction.
[0010]
A fan for cooling the battery cover surface on the cathode electrode side may be further attached.
The cooling effect of the fuel cell can be enhanced by forced air cooling.
[0011]
A stand for supporting the panel cover may be further attached, and a fuel container for storing fuel to be supplied to the fuel cell may be housed inside the stand.
As a result, the fuel container can be stored in an inconspicuous place, and there is no need to newly provide an installation space.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of a liquid crystal television which is an embodiment of the present invention. The liquid crystal television 10 includes a liquid crystal panel 11 that displays an image, a panel cover 12 that is attached to cover the liquid crystal panel 11 to protect the liquid crystal panel 11, a polymer electrolyte fuel cell 16 that is attached to the back side of the panel cover 12, and a panel cover 12 and a pedestal 14 for supporting the polymer electrolyte fuel cell 16.
[0013]
2 is a cross-sectional view taken along the line AA ′ of FIG. 1 (a cross-sectional view at a position crossing the liquid crystal panel 11 and the polymer electrolyte fuel cell 16). The panel cover 12 supports the periphery of the front surface 15 and the back surface of the liquid crystal panel 11 that projects an image. Further, a polymer electrolyte fuel cell 16 is attached to the back surface side of the panel cover 12 so as to contact the back surface of the panel cover 12.
[0014]
FIG. 3 is an enlarged view of an end cross section (C portion in FIG. 2) of the polymer electrolyte fuel cell 16. As shown in the figure, the polymer electrolyte fuel cell 16 includes a battery cover 18 that is in surface contact with the panel cover 12, a battery cover 19 that faces the back side of the liquid crystal television 10, a polymer electrolyte membrane 20, an anode 21, It comprises a cathode electrode 22, an anode current collector 23, a cathode electron conductor 24, and an opening 25.
[0015]
The polymer electrolyte membrane 20 is a thin film of perfluorocarbon sulfonic acid that is chemically stable and has high ionic conductivity. For example, it is preferable to use a thin film of Nafion (registered trademark) manufactured by DuPont, Aciplex (registered trademark) manufactured by Asahi Kasei or Flemion (registered trademark) manufactured by Asahi Glass Co., Ltd. as the polymer electrolyte membrane 20.
[0016]
On both sides of the membrane, an anode 21 (fuel electrode) and a cathode 22 (air electrode) formed by fixing a catalyst in which platinum is supported on carbon, using the same material as that of the polymer electrolyte membrane 20 as a binder, Are joined together. The polymer electrolyte membrane 20, the anode electrode 21, and the cathode electrode 22 joined together are called a membrane / electrode assembly (MEA).
[0017]
A chemical reaction for power generation performed in this membrane-electrode assembly (MEA) will be described.
If hydrogen is supplied to the anode 21 now, hydrogen is ionized into protons and electrons on the surface of the anode 21 by the function of the catalyst by the reaction of the following formula (1).
H ₂ → H ⁺ + 2e ⁻ (1) Formula [0018]
When the protons pass through the polymer electrolyte membrane 20 and reach the cathode electrode 22, a reaction shown in the following formula (2) is performed with oxygen supplied to the cathode electrode 22 by the function of the catalyst of the cathode electrode 22. And water is produced.
1/2 O ₂ + 2H ⁺ + 2e ⁻ → H ₂ O (2) Formula When these two electrodes are connected by wiring, electrons flow and power can be generated.
[0019]
The anode current collector 23 is disposed on the surface of the anode electrode 21 opposite to the polymer electrolyte membrane 20. The anode current collector 23 efficiently collects electrons generated on the surface of the anode electrode 21 and diffuses and supplies hydrogen to the anode electrode 21. have. Electrons ionized at the anode 21 and collected by the anode current collector 23 are conducted to the cathode 22 through wiring not shown.
[0020]
The cathode electron conductor 24 is disposed on the opposite side of the cathode electrode 22 from the polymer electrolyte membrane 20, and has excellent electron conductivity and has high oxygen permeability and generates water generated on the surface of the cathode electrode 22 as a battery. It has air permeability to discharge out of the system. Then, electrons are efficiently conducted to the surface of the cathode electrode 22, and the chemical reaction for generating water shown in the above formula (2) can proceed.
[0021]
The battery cover 18 and the battery cover 19 accommodate an MEA (a membrane / electrode integrated assembly including a polymer electrolyte membrane 20, an anode electrode 21, and a cathode electrode 22), an anode current collector 23, and a cathode electron conductor 24. , Immobilize.
The battery cover 18 and the battery cover 19 are made of a metal such as aluminum, magnesium, iron, or other good heat conductive material so that the reaction heat can be easily radiated.
[0022]
The battery cover 18 is provided with a flow path and a hydrogen supply port for supplying hydrogen sent from a hydrogen container, which will be described later, and the hydrogen supplied from the hydrogen supply port is sent to the anode 21. It is formed in a gas tight structure so that it can react.
[0023]
The battery cover 19 is provided with an opening 25 in a part of the cover surface so that oxygen in the air is supplied to the cathode electrode 22 by a diffusion effect, and water generated at the cathode electrode 22 can be evaporated and removed. The structure is formed.
[0024]
Thus, the polymer electrolyte fuel cell 16 integrally configured by the battery cover 18 and the battery cover 19 is attached to the back surface side of the panel cover 12 of the liquid crystal panel 11.
[0025]
4 is a cross-sectional view taken along the line BB of the table 14 of the liquid crystal television 10 in FIG. The table 14 is hollow inside. In addition, as shown in FIG. 1, the opening part 31 for taking in and out the hydrogen container mentioned later is formed in the upper surface of the stand 14.
[0026]
As shown in FIG. 4, a hydrogen container 32 is stored inside a cradle housing 30 that forms the cradle 14, and an opening 33 of the hydrogen container 32 is provided on one side of the cradle 14. A supply port holding part 34 for fixing the port 33 and a spring 35 for urging the hydrogen container 32 toward the supply port holding part 34 are provided so that hydrogen gas can be introduced.
[0027]
The hydrogen container 32 stores hydrogen. As a storage method, a method of storing high-pressure hydrogen, a method of storing a hydrogen storage alloy in a container and adsorbing hydrogen to the container, a chemical substance containing hydrogen is stored in the container, and some chemical reaction is caused. However, any method may be used.
[0028]
Further, a supply passage pipe (not shown) for sending hydrogen is formed from the supply port holding part 34 to the anode 21 of the polymer electrolyte fuel cell 16, and the supply amount of hydrogen is adjusted in the middle thereof. A valve that can be installed is installed.
[0029]
Next, the operation of the cordless liquid crystal television 10 according to the present invention will be described.
Now, when the power switch is turned on in order to view the video on the liquid crystal television 10, the mouth 33 of the hydrogen container 32 is opened by the electricity of the secondary battery or condenser incorporated separately, and hydrogen is polymerized. It is supplied to the anode 21 of the electrolyte fuel cell 16. On the other hand, oxygen diffused through the opening 25 is supplied to the cathode electrode 22. Then, the reaction shown in the formula (2) is generated to generate electric power, and the generated electric power is supplied to the liquid crystal panel 11 (also supplied to a liquid crystal driving circuit or the like (not shown)), thereby a primary battery or a secondary battery. Video can be projected without using.
[0030]
During this power generation, water is generated at the cathode electrode 22 and reaction heat is generated. If this water and heat are not released outside the fuel cell system, the power generation performance of the cell is deteriorated and the fuel cell is damaged.
[0031]
Therefore, in the present embodiment, in order to efficiently remove water and heat, the panel cover 12 that supports the liquid crystal panel 11 and the battery cover 18 on the anode electrode 21 side are mutually back as shown in FIG. Further, they are in contact with each other, and the opening 25 on the cathode electrode 22 side is the outermost surface (the outermost surface on the back surface side opposite to the liquid crystal panel 11) so as to come into contact with the outside air.
[0032]
Thereby, since the cathode electrode 22 side is open, the generated water and heat can be smoothly evaporated, so that the power generation efficiency of the polymer electrolyte fuel cell 16 is improved and the cause of failure is also eliminated.
[0033]
Further, the reaction heat is transmitted from the battery cover 18 to the panel cover 12 by a heat conduction phenomenon.
If the battery cover 18 and the panel cover 12 are formed of a good heat conductor such as a metal, not only the heat dissipation effect is further improved, but also the heat generated in the polymer electrolyte fuel cell 16 is liquid crystal through the panel cover 12. Heat is transferred to the panel 11 itself. As a result, the driving speed of the liquid crystal is increased and a more beautiful image can be enjoyed.
[0034]
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 1 showing another embodiment of the present invention. In order to further improve the power generation efficiency of the fuel cell by releasing reaction heat, it is supported by a frame 36 at a position facing the opening 25 of the battery cover 19 of the polymer electrolyte fuel cell 16 as shown in FIG. A fan 37 may be attached to forcibly cool the opening 25 with air.
[0035]
【The invention's effect】
As described above, in the present invention, since the polymer electrolyte fuel cell is mounted on the flat panel display device, it can be used without using a power cord, and can continue to display images without being charged for a long time. be able to.
[0036]
Further, since the flat thin polymer electrolyte fuel cell is attached to the position on the back side of the flat panel, the fuel cell can be attached to an inconspicuous position without impairing the characteristics as a thin television. Moreover, there is no need to worry about the location of the fuel cell.
[0037]
In addition, since hydrogen used as fuel for the fuel cell is built in the stand, a large hydrogen container can be used as long as it can be stored in the stand, and it can withstand long-term television viewing. Become.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a liquid crystal television which is an embodiment of the present invention.
2 is a cross-sectional view taken along the line A-A in FIG.
FIG. 3 is an enlarged view of a portion C in FIG.
4 is a cross-sectional view taken along the line B-'B of FIG.
FIG. 5 is a cross-sectional view taken along line A-A of a liquid crystal television which is another embodiment of the present invention.
[Explanation of symbols]
10: LCD TV (flat panel display device)
11: Liquid crystal panel 12: Panel cover 14: Stand 15: Liquid crystal surface 16: Polymer electrolyte fuel cell 18: Battery cover (anode electrode side)
19: Battery cover (cathode electrode side)
20: Electrolyte membrane 21: Anode electrode 22: Cathode electrode 23: Anode current collector 24: Cathode electron conductor 25: Opening 32: Hydrogen container 37: Fan

Claims (5)

A flat panel, a panel cover that supports the flat panel, and a polymer electrolyte fuel cell mounted as a power source and attached to the back side of the panel cover;
The polymer electrolyte fuel cell includes a planar polymer electrolyte membrane, an anode electrode and a cathode electrode arranged so as to sandwich the polymer electrolyte membrane, the polymer electrolyte membrane, the anode electrode, and the cathode electrode. And a battery cover for housing
The battery cover is separate from the panel cover,
The panel cover and the battery cover are formed of metal,
The polymer electrolyte fuel cell is attached so that the metal of the battery cover and the metal of the panel cover are in direct surface contact ,
With transfer heat generated in the polymer electrolyte fuel cell during power generation of the polymer electrolyte fuel cell from the battery cover to the panel cover, the flat panel display device also Ru transmitted to the flat panel through the panel cover . A pedestal for supporting the panel cover;
The apparatus according to claim 1, wherein the cradle accommodates therein a fuel container for storing fuel to be supplied to the polymer electrolyte fuel cell. 2. The polymer electrolyte fuel cell is mounted such that a battery cover surface on the anode electrode side is in contact with a back surface of the panel cover, and a battery cover surface on the cathode electrode side is directed to a back space of the flat panel display device. Or the apparatus of 2. The device according to any one of claims 1 to 3, wherein an opening for heat dissipation, oxygen supply to the cathode electrode, and evaporation of water generated at the cathode electrode is formed on the battery cover surface on the cathode electrode side. . The apparatus as described in any one of Claims 1-4 further provided with the fan for cooling the battery cover surface by the side of a cathode pole.

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