JP2007011098A - Power wireless display device - Google Patents

Abstract

【Task】
Focusing on the fact that organic electroluminescence emits light even at a low voltage and is extremely energy efficient, a light-emitting display device having an extremely simple configuration without providing a power source is provided.
[Solution]
The power wireless supply type display device includes a power transmitter 200 including at least a carrier high-frequency oscillator 17 and a power source 19 that drives the antenna 17, an antenna 1 that receives a carrier RF transmitted by the power transmitter 200, and an antenna 1 1 and a receiver 100 having a detection circuit 3 connected to the same, and an electroluminescence 7 is connected to the output of the receiver 100.

Description

  The present invention relates to a device that transmits electric power wirelessly, receives the electric power, and causes an electroluminescence element to emit light.

  In the 21st century, ubiquitous network systems have been rapidly expanding.

These wireless information transmissions are becoming increasingly widespread, such as wireless LAN connections within stations and expansion of various services using mobile phones. The end of information transmission, that is, transmission to a person is performed by voice and image. However, a considerable amount of power is required for sound reproduction and image display. In the display of television broadcast receivers and personal computer monitor screens, cathode ray tubes, liquid crystal displays, and plasma displays, which are currently mainstream, use a commercial power source or a secondary battery as a source of light emission energy.

  On the other hand, wireless power supply is rarely realized at high power and long distances, such as railway ticket gates, entrance / exit management, IC card systems such as electronic money, data carrier systems, etc. It is only put to practical use in signal communication. A data communication apparatus corresponding to such a data carrier system is disclosed in, for example, Patent Document 1, and a first unit of the data communication apparatus is equipped with power supply power, but a second unit (ID unit) is a first unit. It is a passive device that obtains signal power by wireless communication with the unit, and there is no active power supply.

  Patent Document 2 discloses an image display that wirelessly sends a signal to an electroluminescence (EL) display. However, the EL display is rotated to obtain a stereoscopic image by visual misrecognition. Need.

Japanese Patent Laid-Open No. 1-151832. JP-A-2005-39581

  The present invention focuses on the fact that an organic electroluminescence element emits light even at a low voltage and is extremely energy efficient, and an object of the present invention is to provide a light-emitting display device having a very simple configuration without mounting a power source. .

  In order to achieve the above object, a wireless power supply type display device according to claim 1 is a power transmitter including at least a carrier high frequency oscillator and a power source for driving the oscillator. And a receiver including an antenna for receiving a carrier wave transmitted by the power transmitter, and a detection circuit connected to the antenna, and an electroluminescence element is connected to an output of the receiver. To do.

  In this power wireless supply type display device, a power source is provided on the power transmitter side, but a power source is not provided on the receiver side, and the electroluminescent element emits light by receiving power supply by wireless communication. The power source on the power transmitter side may be either a power source derived from a commercial power source or a secondary battery.

  Similarly, the wireless power supply display device according to claim 2 is the wireless power supply display device according to claim 1, wherein a modulator for modulating a data signal with the carrier high frequency is provided in the power transmitter. And a data signal modulated wave is transmitted and received, and the data signal is displayed on the electroluminescence element.

  The power wireless supply type display device according to claim 2 transmits the data signal modulated wave from the power transmitter and receives it by the receiver, so that a voltage corresponding to the data signal is obtained as a detection output and applied to the electroluminescence element. Therefore, the electroluminescence element performs light emission display corresponding to the data signal. At this time, the electroluminescence element exhibits a light emission intensity corresponding to the voltage of the detection output and does not merely emit on / off flashing light, and thus can be used for various display applications.

  Any modulation method such as amplitude modulation, frequency modulation, phase modulation, and load modulation can be used as the modulation method, but the AC / DC converter circuit, which is the demodulator circuit on the receiver side, must operate at low power. It is.

  A power wireless supply type display device according to claim 3 is the power wireless supply type display device according to claim 1 or 2, wherein the electroluminescence element is an organic electroluminescence element. .

  Since the light-emitting material of the electroluminescence element is an organic material, it is structurally simple, extremely thin, can have a long life, can be designed with various emission colors, and is inexpensive. Among organic light emitting materials, an aluminum quinolyl complex, a metal complex represented by Alq3 (tris (8-hydroxyquinolinato) aluminum), a polyphenylene vinylene (PPV) derivative, a polyfluorene derivative, and the like are particularly preferable.

  The organic electroluminescent illuminant has low power consumption, and emits light sufficiently even when it is supplied with power wirelessly like the power wireless supply type display device of the present invention. Further, if the high frequency for power supply is modulated by a data signal, light emission display corresponding to the data signal is performed.

  Therefore, by installing the receiver equipped with the electroluminescence element of the power wireless supply type display device of the present invention in a place where it is difficult to obtain a power source, by supplying information and power with a power transmitter carried by a person, Information can be displayed. Conversely, a receiver equipped with an electroluminescence element is used as a portable display device, and information and power are supplied by a power transmitter installed at a specific location, thereby giving visible information to the receiver of the receiver. be able to. It can be used not only for the transmission of information but also for general advertising, promotion, instruction, communication, etc.

Preferred form for carrying out the invention

  A preferred embodiment of a wireless power supply type display device of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block circuit diagram showing the overall configuration of a wireless power supply type display device to which the present invention is applied. As shown in the figure, this wireless power supply type display device includes a receiver 100 and a power transmitter 200.

  The power transmitter 200 includes a high-frequency oscillator 17, a modulator 15 that performs high-frequency modulation on a data signal, a power amplifier 13, and an output antenna 10. The power transmitter 200 includes a battery 19 and is driven by this battery power.

  In the receiver 100, a detection circuit including a detection diode 3 and a capacitor 4 is connected to a reception circuit including a reception antenna coil 1 and a capacitor 2, and an organic electroluminescence element 7 is disposed. A metal thin film electrode 5 is formed on one surface of the organic electroluminescence element 7, and a patterned conductive glass electrode 6 is formed on the back surface of the metal thin film electrode 5, and is connected to a detection circuit.

FIG. 2 shows a substantial diagram of the receiver 100. The receiving antenna coil 1 is formed by edging copper plated on a circuit board. The organic electroluminescence element 7 displays the numbers 0-9 and 4 digits in 7 segments (7 Segments). In the example shown, 1, 2, 3, 4 are displayed. 7 ₁ is the light display unit of the organic electroluminescent device, 7 ₀ is a non-light emitting portion of the organic electroluminescence element.

  The operation of the wireless power supply type display device shown in FIG. 1 will be described below with reference to the operation waveform diagram shown in FIG. 3 when the frequency modulation method is amplitude modulation.

  A data signal shown in FIG. 3A is input to the modulator 15, and a high frequency waveform (B) is oscillated from the oscillator 17 and input to the modulator 15. The data signal (A) is amplitude-modulated by the modulator 15 with a high frequency (B). This is amplified by the power amplifier 13 and oscillated from the output antenna 10 as a modulated carrier wave RF (Ratio Frequency).

  The modulated carrier wave RF oscillated from the output antenna 10 is received by the receiving antenna coil 1 of the receiver 100, resonates with the capacitor 2, and is input to the detection circuit. The detection diode 3 receives half-wave rectification detection and generates a pulsating flow of detection output (D). This detection output (D) is smoothed by the capacitor 4 to reproduce the DC data signal (E). The current of the DC data signal flows through the organic electroluminescence element 7 through the metal thin film electrode 5 and the conductive glass electrode 6, and the organic electroluminescence element 7 emits light at the light emission timing (F).

  The power wireless supply type display device of the present invention was tried as in the following examples.

  The receiver 100 has the configuration shown in FIGS. 1 and 2 and details are as follows. The receiving antenna coil 1 is made of copper foil (thickness 35 μm) on a glass-reinforced epoxy substrate, and is of A type (line width 1 mm, total length 375 mm = half wavelength of microwave 400 MHz, antenna length 34 mm, antenna width 27 mm), Two types of B type (line width: 0.3 mm, line length: 19 mm, antenna width: 13 mm) were prototyped. The detector diode used was a Schottky barrier diode. The display unit used was an organic electroluminescence panel manufactured by Hioki Electric Co., Ltd.

  An amateur radio transceiver is used as the power transmitter 200. This transceiver can output 1 W in the 400 MHz band. The antenna (output antenna 10) is a whip antenna with a built-in oscillation side.

  Voltage was supplied to the organic electroluminescence element of the receiver 100 with the above apparatus configuration. As a result, it was found that the voltage supplied to the organic electroluminescence element largely varies depending on the shape of the receiving antenna, the distance to the transmitter, and the relative position, but can be supplied at a voltage of about 5 to 10V.

The emission intensity of the organic electroluminescence element was approximately 800 cd / m ² (A type antenna coil), which is higher than the brightness of a normal television screen (200 to 300 cd / m ² ). It was 450 cd / m ² for the B type antenna coil.

1 is a block circuit diagram showing an overall configuration of an embodiment of a power wireless supply type display device to which the present invention is applied.

1 is a substantial diagram of an embodiment of a receiver of a wireless power supply type display device to which the present invention is applied.

It is an operation | movement waveform diagram of the electric power wireless supply type display apparatus to which this invention is applied.

Explanation of symbols

  1 is a receiving antenna coil, 2 is a capacitor, 3 is a detector diode, 4 is a capacitor, 5 is a metal thin film electrode, 6 is a conductive glass electrode, 7 is an organic electroluminescence element, 10 is an output antenna, 13 is a power amplifier, 15 Is a modulator, 17 is an oscillator, 100 is a receiver, 200 is a power transmitter, and RF is a modulated carrier wave.

Claims (3)

  A power transmitter including at least a carrier high-frequency oscillator and a power source for driving the same; an antenna that receives a carrier wave transmitted by the power transmitter; and a receiver including an AC / DC converter circuit connected to the antenna An electric luminescence element is connected to the output of the receiver.   The modulator for modulating a data signal at the carrier high frequency is provided in the power transmitter, transmits and receives a data signal modulated wave, and the data signal is displayed on the electroluminescence element. Power wireless display system.   The power wireless supply type display device according to claim 1 or 2, wherein the electroluminescence element is an organic electroluminescence element.

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