KR20230030072A - retina image processing device and the Method thereof - Google Patents

Abstract

A retinal image processing device according to an embodiment of the present invention comprises: an antenna which is provided on a contact lens platform, and receives an RF radio signal of image data transmitted from an external camera; a power harvester which is provided on the contact lens platform, and rectifies the RF radio signal received by the antenna into a DC signal, to outputs the same to an optical signal; and a retinal neural circuit which is inserted into the retina, and generates a current signal in response to light incident from the power harvester.

Description

Retina image processing device and method thereof

The present invention relates to a retinal image processing device and method thereof, and particularly, the present invention relates to a retinal image processing device for the visually impaired, which includes an antenna for receiving an image signal from an external camera on a contact lens and an RF power harvester for generating wireless power. It relates to a retinal image processing apparatus and method capable of providing high-efficiency power to the retinal neural circuit by constructing a retinal neural circuit (inside the body) formed outside the body and inside the eyeball.

A neural circuit is a circuit designed similarly to the mechanism of a nerve cell connected to the human brain. Therefore, the neural circuit is designed to imitate the human biomechanism, and is designed to imitate the structure of a neuron, which is a basic human neural circuit.

Human information processing takes a method in which the brain receives and processes information recognized by sensory organs through neurons.

Visual neuroscience is a branch of science that studies human visual organs and implements artificial devices that mimic the mechanisms of these visual organs.

Visual neuroscience is to understand how biological vision is achieved by understanding the input and output connection patterns of cells such as the retina that make up the human visual organ, and by studying how cells receive, process, store, and convert signals. is the task of

Based on these findings, one of the things that imitate the human visual organ is the retinal neural circuit. Such a retinal neural circuit is required to develop a structure that increases the resolution of acquired images and has a stable output signal.

Meanwhile, a battery is generally used to supply power to a sensor or device that is implanted in a living body and senses or stimulates nerve tissue. However, since a sensor or device implanted in a living body and sensing or stimulating nerve tissue is small in size and light in weight, the size of a battery used therein is also very small. Since the size of the battery is small, the usage time of the sensor or device is very small. As a method for solving this problem, a wireless power transmission method for wirelessly transferring power from the outside is suitable.

In such a wireless power supply, RF energy harvesting refers to the supply of energy using an RF signal in an environment where electricity cannot be supplied by wire or it is difficult to replace a battery. Since the RF signal received through the antenna is an alternating current (AC) voltage, an AC-DC converter, that is, a rectifier is required to convert it to a direct current (DC) voltage required by most electronic components.

In order to efficiently transfer the harvested energy to devices and use it in semiconductors or the like, miniaturization of rectifiers is required.

In addition, since the harvested energy is very low power, the rectifier must be designed to have high efficiency. In addition, the additional circuit for controlling the rectifier should be simple to design easily and not require a separate external auxiliary battery.

Korean Patent Application No. 10-2019-0127145

The present invention relates to a retinal image processing device for the visually impaired, comprising a retinal neural circuit (body) formed outside the body and inside the eyeball, including an antenna for receiving an image signal from an external camera and an RF power harvester for generating wireless power in a contact lens. It is an object of the present invention to provide a retinal image processing device and method capable of providing high-efficiency power to a retinal neural circuit by configuring the inside).

However, the technical problem to be achieved by the present embodiment is not limited to the technical problem as described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, a retinal image processing apparatus according to an embodiment of the present invention includes an antenna provided on a contact lens platform and receiving an RF radio signal of image data transmitted from an external camera; a power harvester provided on the contact lens platform and outputting an optical signal by rectifying the RF wireless signal received by the antenna into a DC signal; and a retinal neural circuit that is inserted into the retina and generates a current signal in response to light incident from the power harvester.

Here, in particular, the power harvester, AC-coupling capacitor for coupling the RF wireless signal; a multi-stage rectifier for receiving the AC signal output from the coupling capacitor and rectifying it into a DC signal; and a filtering unit for filtering the DC signal rectified by the multi-stage rectifier.

In particular, the power harvester is characterized in that it further includes a micro light emitting diode (μ-LED) outputting the DC signal filtered by the filtering unit as an optical signal.

Here, in particular, the multi-stage rectifier is configured by connecting the first stage and the second stage, and each of the RF wireless signal input terminals of the first stage and the second stage includes coupling capacitors (C1 to C4) for AC-coupling It is characterized by the fact that

In particular, C1 and C2 are connected to the input terminal of the first stage, and C3 and C4 are connected to the input terminal of the second stage.

Here, in particular, the output terminal of C1 is connected to the gate of M1 and the source of M2, the output terminal of C2 is connected to the gate of M3 and the source of M4, and the output terminal of C3 is connected to the gate of M1' and the source of M2'. It is characterized in that it is connected to the source of C4 and the output terminal of C4 is connected to the gate of M3' and the source of M4'.

In particular, a C5 capacitor is included between the gate of M4' and the ground, and the C5 capacitor maintains the DC component of the signal output from the second stage uniformly.

Here, in particular, the retinal neural circuit, a current generator for generating a current in response to incident light; a current mirror outputting a current having the same magnitude as the current input from the current generator; and a feedback circuit for returning a signal input from the current mirror to the current generator, wherein the feedback circuit includes a configuration for controlling the magnitude of a voltage output from the current mirror.

Here, in particular, the current generation unit, a photodiode for generating a current in response to incident light; a first capacitor accumulating charge by the current generated by the photodiode; and a first amplifier circuit for generating a first output voltage that is the output voltage of the current generator and is a predetermined value.

Here, the feature is that the output signal of the feedback circuit is input to the first amplifier circuit.

In particular, the current mirror is characterized in that it receives the first output voltage from the first amplifying circuit and outputs a second output voltage.

Here, in particular, the feedback circuit is characterized in that it controls the current mirror so that the second output voltage is output as a preset value.

Here, in particular, the second output voltage is characterized in that it is generated by light input to the photodiode and a control voltage input to the current mirror.

Here, in particular, the feedback circuit, a transistor for amplifying the input voltage; and

It is characterized in that it includes a second capacitor that is connected to the transistor and accumulates charge by an input current.

In addition, as a technical means for achieving the above-described technical problem, a retinal image processing method according to an embodiment of the present invention includes receiving an RF radio signal of image data transmitted from an external camera at an antenna of a contact lens platform; rectifying the RF wireless signal received by the antenna in a power harvester into a DC signal and outputting it as an optical signal; and generating a current signal in response to light incident from the power harvester in a retinal neural circuit inserted into the retina.

Here, in particular, the step of outputting an optical signal from the power harvester may include AC-coupling the received RF wireless signal; receiving the AC-coupling AC signal and rectifying it into a DC signal; filtering the rectified DC signal; and outputting the filtered DC signal as an optical signal.

Here, in particular, the generating of the current signal in response to the incident light may include: generating a current in response to the incident light from a current generator; outputting a current having the same magnitude as the generated current from a current mirror; and receiving the current output from the feedback circuit, controlling the magnitude of the voltage, and returning the output current to the current generator.

According to any one of the above-described problem solving means of the present invention, an optical signal is transmitted from the outside of the body to the inside of the body, and the nerve signal generates an optic nerve action potential in response to the intensity of the optical signal for the image to transmit image information to the brain. In the retinal image processing device, it is possible to harvest high-efficiency power and provide power semi-permanently without a separate power supply device outside the body (contact lens).

1 is a diagram schematically showing the overall configuration to which a retinal image processing apparatus according to an embodiment of the present invention is applied.
FIG. 2 is a diagram schematically showing the configuration of the retinal image processing apparatus of FIG. 1. Referring to FIG.
FIG. 3 is a circuit diagram schematically showing the configuration of a power harvester of the retinal image processing device of FIG. 2 .
4A to 4C are graphs showing changes in power values obtained according to frequency in the power harvester of the present invention.
5 is a graph showing the change in efficiency according to the output power of the present invention.
Figure 6 is a circuit diagram schematically showing the configuration of the retinal neural circuit of Figure 2.
7 is a diagram schematically showing a flow chart for a retinal image processing method according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly describe the present invention, parts irrelevant to the description in the drawings are omitted, and similar reference numerals are assigned to similar parts throughout the specification. In addition, while explaining with reference to the drawings, even if the configuration is indicated by the same name, the drawing number may vary depending on the drawing, and the drawing number is only described for convenience of explanation, and the concept, characteristic, function of each component is indicated by the corresponding drawing number. or the effect is not to be construed as limiting.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "electrically connected" with another element interposed therebetween. . In addition, when a part is said to "include" a certain component, it means that it may further include other components, not excluding other components unless otherwise stated, and one or more other components. It should be understood that the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In this specification, 'unit' or 'module' includes a unit realized by hardware or software, or a unit realized by using both, and one unit is realized by using two or more hardware may be, or two or more units may be realized by one hardware.

1 is a diagram schematically showing the overall configuration to which a retinal image processing device according to an embodiment of the present invention is applied, and FIG. 2 is a diagram schematically showing the configuration of the retinal image processing device of FIG. 1 .

As shown in FIGS. 1 and 2 , the retinal image processing device 10 of the present invention is provided on the contact lens platform 11 and receives image data photographed from an external camera 400 as an RF wireless signal. antenna 100; a power harvester 200 provided on the contact lens platform 11 and rectifying the RF wireless signal received from the antenna 100 into a DC voltage and outputting it as an optical signal; and a retinal neural circuit 300 inserted into the retina and generating a current signal in response to light incident from the power harvester 200.

The antenna 100 is a small electric loop microstrip antenna and can be configured on a contact lens platform to receive RF images without implantation in the eye.

More specifically, all devices implanted in human tissue must be designed in a frequency-limited band harmless to the human body. That is, the frequency band harmless to the human body may be limited to a range permitted as an ultra-wideband (UWB) frequency band of 3.1 GHz to 10.6 GHz. Here, it is desirable to design the UWB antenna so that it can be applied to a small size, low power consumption, high bit rate and highly integrated system. For example, a small loop antenna can be placed in a glass contact lens.

The power harvester 200 is configured in the contact lens platform 11, and the retinal neural circuit 300 is configured as an implant in the inner retina of the eye, so that there is a gap between the contact lens platform 11 and the artificial retinal neural circuit 300. A power and data transmission method mainly uses an optical signal, and the optical signal is information data for acquiring an image in the retina.

More specifically, the power harvester 200 rectifies an RF signal, which is an AC signal transmitted from the antenna 100, into a DC voltage and outputs it as an optical signal. Here, the power harvester 200 supplies DC power to the customized micro light emitting diode (μ-LED) 230 . At this time, the micro light emitting diode (μ-LED) 230 mainly emits light to transmit an optical signal.

Here, reference is made to FIGS. 3 to 5 to be described later for a detailed description of the power harvester 200 .

The retinal neural circuit 300 receives the light signal transmitted from the micro light emitting diode (μ-LED) 230 at the photodiode 310, and the light passes through the ganglion, amacrine, bipolar, horizontal cell, and photoreceptor. It stimulates photoreceptors and converts them into electrical signals. Photoreceptors generate signals that pass through the neuron's middle layer to the ganglion cells.

After that, the information of the transmitted signal is propagated to the optic nerve and then propagated to the brain in the form of an action potential. At this time, action potentials in the form of output spikes are generated by neuron-retinal circuits. Here, a detailed description of the retinal neural circuit 300 will be referred to FIG. 6 to be described later.

Meanwhile, FIG. 3 is a circuit diagram schematically showing the configuration of a power harvester of the retinal image processing device of FIG. 2 .

As shown in FIG. 3, the power harvester 200 includes a multi-stage rectifier 210 that receives the AC signal, which is the RF wireless signal, and rectifies it into a DC signal; a filtering unit 220 filtering the DC signal rectified by the multi-stage rectifier 210; and a micro light emitting diode (μ-LED) 230 outputting the DC signal filtered by the filtering unit as an optical signal.

The multi-stage rectifier 210 is configured by connecting a first stage 211 and a second stage 212, and an AC-couple is connected to each RF wireless signal input terminal of the first stage 211 and the second stage 212. It can be configured by including coupling capacitors (C1 to C4) that ring.

In addition, the first stage 211 may be configured by connecting M1 to M4 PMOS transistors, and the second stage 212 may be configured by connecting M1' to M4' PMOS transistors.

More specifically, coupling capacitors C1 and C2 for AC-coupling the RF wireless signal are connected to the input terminal of the first stage 211 .

The output terminal of C1 is connected to the gate of M1 and the source of M2, and the output terminal of C2 is connected to the gate of M3 and the source of M4.

In addition, coupling capacitors C3 and C4 for AC-coupling the RF wireless signal are connected to the input terminal of the second stage 212 .

The output terminal of C3 is connected to the gate of M1' and the source of M2', and the output terminal of C4 is connected to the gate of M3' and the source of M4'.

In addition, a C5 capacitor is connected between the gate of M4' and the ground, and the C5 capacitor can maintain the DC component of the signal output from the second stage 212 uniformly.

Here, in the M1 to M4 PMOS transistors of the first stage 211 and the M1' to M4' PMOS transistors of the second stage 212 of the multi-stage rectifier 210 of the present invention, the P-type metal oxide semiconductor (PMOS) is the body The sensitivity of the rectifier can be improved by connecting the body terminal to the source to eliminate the effect, allowing it to operate at a lower threshold.

Equation 1 below shows the threshold voltage of the forward bias of the PMOS transistor.

[Equation 1]

Here, V _th0p is the threshold voltage when the substrate voltage (V _sb ) is 0, γ is the body effect coefficient, 2Ψ _F is the surface potential, and the potential difference between the source and body of the MOSFET.

In this case, V _th0p , γ, and 2Ψ _F are values transmitted during the manufacturing process and cannot be arbitrarily changed because they are determined by the doping concentration of the silicon substrate, the amount of charge in the depletion region, and the work function of the silicon substrate.

However, the threshold voltage of the MOSFET can be arbitrarily adjusted during circuit design through V _SB , which is the potential difference between the source and the body.

In addition, calculation at each step of the drain current operation considered for the PMOS transistor can be expressed as Equation 2 below.

[Equation 2]

where V _d is the drain voltage, I _ds is the current through the channel of the transistor with negative direction, W is the channel width from drain to source, L is the channel length, Ψ _t is the thermal voltage, equal to 26 mV at room temperature, and n represent slope coefficients, respectively.

The filtering unit 220 makes it possible to obtain a smooth and regulated DC output from mW to W by the output of the T-shaped filtering network.

Meanwhile, FIGS. 4A to 4C are graphs showing changes in power values obtained according to frequency in the power harvester of the present invention.

As shown in FIGS. 4A to 4C , the output according to the frequency range is shown, and the power efficiency of 40% to 82% is shown for the 2.7W output at 4mW.

That is, FIG. 4a shows an output of 4mW to 7.5mW, 7mW to 0.1mW, and 0mW to 2.7W in the frequency band of 3GHz to 5.5GHz, FIG. 4b to 5.5GHz to 7.5GHz, and FIG. 4c to 7.5GHz to 10.5GHz.

5 is a graph showing the change in efficiency according to the output power of the present invention.

As shown in FIG. 5, it can be seen that the efficiency increases linearly as the output power increases from mW to W. Since this forms a multi-stack structure of the power harvester, it shows the effect of reducing power loss and reducing parasitic interconnection.

Therefore, it is possible to compromise through the design balance between the output voltage and the impedance matching through the above-described multi-stage rectifier, and to obtain high-efficiency power by preventing additional DC voltage loss with the output of the first stage and the second stage. .

On the other hand, Figure 6 is a circuit diagram schematically showing the configuration of the retinal neural circuit of Figure 2. As shown in FIG. 6, the retinal neural circuit 300 includes current generators 310, 320, and 330 that generate current in response to incident light; a current mirror (340) outputting a current having the same magnitude as the current input from the current generating units (310, 320, 330); and a feedback circuit 350 returning a signal input from the current mirror 340 to the current generator 310, 320, 330, wherein the feedback circuit 350 is A configuration for controlling the magnitude of the output voltage may be included.

The current generation unit (310, 320, 330) is a photodiode 310 for generating a current in response to light incident on the retinal nerve circuit; a first capacitor 320 in which charge is accumulated by the current generated by the photodiode 310; and a first amplifier circuit 320 for generating a first output voltage which is the output voltage of the current generators 310, 320 and 330 and is a preset value.

The photodiode 310 is a device that converts light energy into electrical energy, and thus can generate current in response to incident light. When light is incident on the photodiode 310, current flows through the photodiode 310.

Charges may be accumulated in the first capacitor 320 by the current generated by the photodiode 310 . Charges accumulated in the first capacitor 320 are discharged from the first capacitor 320 as the first amplifier circuit 330 is turned on and operated, and the first amplifier circuit 330 is turned off again. ), charges may be accumulated again as light is incident on the photodiode 110 .

The first input voltage Vi input to the first amplifier circuit 330 may increase in proportion to the amount of charge accumulated in the first capacitor 320 . In the retinal neural circuit of the embodiment, the first amplifier circuit 330 may be turned off until the first input voltage Vi reaches the switch voltage for operating the first amplifier circuit 330 .

When electric charge is accumulated in the first capacitor 320 and the first input voltage Vi reaches the switch voltage, the first amplifier circuit 330 is turned on to supply the first input voltage Vi to the first amplifier circuit 330. ) may be input as an input signal, and finally, image information may be output as a step-wave pulse voltage signal having the same voltage as the second output voltage Vout from the retinal nerve circuit.

Therefore, in the retinal neural circuit of the embodiment, image information may be output as a step-wave voltage signal using the first capacitor 320 . As described above, the voltage signal of the step waveform can increase the resolution of the acquired image compared to the voltage signal of the wave waveform or the sine wave.

The first amplifier circuit 330 may generate a first output voltage Vo which is the output voltage of the current generator and is a preset value. Accordingly, image information may be input to the first amplifier circuit 330 as the first input voltage Vi and output as the first output voltage Vo.

The current mirror 340 receives the first output voltage from the first amplifier circuit and outputs a second output voltage.

More specifically, the current mirror 340 may include, for example, P-channel MOSFETs M8 and M10 and N-channel MOSFETs M9 and M11. At this time, the control voltage Vc may be input to the N-channel MOSFET M11.

The second output voltage Vout may be generated by the light input to the photodiode 310 and the control voltage Vc input to the current mirror 340 . Accordingly, when the control voltage Vc is input, the current mirror 200 may output the second output voltage Vout.

That is, the current mirror 340 can receive the first output voltage Vo from the first amplifier circuit 330 and output the second output voltage Vout, which is the final output signal of the retinal neural circuit of the embodiment. there is.

The feedback circuit 350 may include a transistor that amplifies an input voltage and a second capacitor 360 that is connected to the transistor and accumulates charge by an input current.

Here, the feedback circuit 350 may include P-channel MOSFETs M12, M14, M16, and M17 and N-channel MOSFETs M13, M15, and M18. At this time, a second reset pulse (reset2) may be input to a portion where MOSFETs M17 and M18 are connected, and a reset voltage (Vreset) may be input to MOSFET M16.

At this time, the second reset pulse reset2 may be input as a current signal or a voltage signal. The feedback circuit 350 may operate when the second reset pulse reset2 and the reset voltage Vreset are input.

The second capacitor 360 is connected to the transistor, and charges may be accumulated by an input current. The role of the second capacitor 360 is the same as that of the first capacitor 320 described above.

That is, the second capacitor 360 transmits a step-wave voltage signal from the feedback circuit 350 to the first amplifying circuit 330 of the current generators 310, 320, and 330, thereby generating a second output voltage. (Vout) can be output as a step waveform, so that the resolution of the image acquired by the retinal neural circuit can be increased.

An output signal of the feedback circuit 350 may be input to the first amplifier circuit 330 . An output signal of the feedback circuit 350 may be input to MOSFET M2 of the first amplifier circuit 330 .

In an embodiment, the first output voltage Vo and the second output voltage Vout may be output in a pulse waveform. At this time, the first output voltage Vo and the second output voltage Vout may be preset values.

The feedback circuit 350 may control the second output voltage Vout, which is the final output signal of the retinal neural circuit, to be maintained constant.

Therefore, when the retinal neural circuit operates, the current generators 310, 320, 330 or the current mirror 340 malfunction due to an electrical external shock, so that the first output voltage Vo or the second output voltage Vout is out of the set value. Even in this case, the second output voltage Vout of the retinal neural circuit can be maintained at a constant value.

7 is a diagram schematically showing a flow chart for a retinal image processing method according to the present invention. Here, a detailed description of each step will be omitted with reference to FIGS. 1 to 6 .

As shown in FIG. 7, first, the antenna of the contact lens platform receives an RF radio signal of image data transmitted from an external camera (S710).

In addition, the power harvester rectifies the RF wireless signal received by the antenna into a DC signal and outputs it as an optical signal.

More specifically, AC-coupling the received RF wireless signal (S720) is performed, and the AC-coupling AC signal is received and rectified into a DC signal (S730).

Then, filtering the rectified DC signal (S740) is performed, and the filtered DC signal is output as an optical signal (S750).

In addition, a current signal is generated in response to light incident from the power harvester in the retinal neural circuit inserted into the retina.

More specifically, first, after the step of generating a current in response to the incident light in the current generator (S760), and outputting a current having the same magnitude as the generated current from the current mirror (S770), , The step of receiving the output current from the feedback circuit, controlling the magnitude of the voltage, and returning it to the current generator (S780).

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

100: antenna
200: power harvester
210: multi-stage rectifier
211: first stage
212: second stage
220: filtering unit
230: micro light emitting diode
300: retinal neural circuit
310: photodiode
330: amplifying circuit
340: current mirror
350: feedback circuit

Claims (18)

an antenna provided on the contact lens platform and receiving an RF radio signal of image data transmitted from an external camera;
a power harvester provided on the contact lens platform and configured to rectify the RF wireless signal received by the antenna into a DC signal and output it as an optical signal; and
A retinal image processing device including a retinal neural circuit inserted into the retina and generating a current signal in response to light incident from the power harvester.
According to claim 1,
The power harvester,
a multi-stage rectifier for receiving the RF wireless signal and rectifying it into a DC signal; and
Retinal image processing apparatus comprising a; filtering unit for filtering the DC signal rectified in the multi-stage rectifier.
According to claim 1,
The power harvester further comprises a micro light emitting diode (μ-LED) outputting the DC signal filtered by the filtering unit as an optical signal.
According to claim 2,
The multi-stage rectifier is configured by connecting the first stage and the second stage, and includes coupling capacitors (C1 to C4) for AC-coupling at each RF wireless signal input terminal of the first stage and the second stage. Retinal image processing device to be.
According to claim 4,
The retinal image processing apparatus, characterized in that the first stage is configured by connecting M1 to M4 PMOS transistors, and the second stage is configured by connecting M1' to M4' PMOS transistors.
According to claim 4,
C1 and C2 are connected to input terminals of the first stage, and C3 and C4 are connected to input terminals of the second stage.
According to claim 5,
The output terminal of C1 is connected to the gate of M1 and the source of M2, the output terminal of C2 is connected to the gate of M3 and the source of M4, and the output terminal of C3 is connected to the gate of M1' and the source of M2'. and the output terminal of C4 is connected to the gate of M3' and the source of M4'.
According to claim 7,
A retina image processing apparatus comprising a C5 capacitor between the gate of M4' and a ground, wherein the C5 capacitor maintains a DC component of a signal output from the second stage uniformly.
According to claim 1,
The retinal neural circuit,
a current generator generating a current in response to incident light;
a current mirror outputting a current having the same magnitude as the current input from the current generator; And a feedback circuit for returning the signal input from the current mirror to the current generator,
The feedback circuit comprises a component for controlling the magnitude of the voltage output from the current mirror.
According to claim 9,
The current generator,
a photodiode that generates current in response to incident light;
a first capacitor accumulating charge by the current generated by the photodiode; and
and a first amplifier circuit for generating a first output voltage that is the output voltage of the current generator and is a preset value.
According to claim 10,
The retinal image processing device, characterized in that the output signal of the feedback circuit is input to the first amplifier circuit.
According to claim 11,
The current mirror,
The retinal image processing device, characterized in that for receiving the first output voltage from the first amplifier circuit and outputting a second output voltage.
According to claim 12,
The feedback circuit,
The retinal image processing device characterized in that for controlling the current mirror so that the second output voltage is output as a preset value.
According to claim 12,
The second output voltage is,
The retinal image processing apparatus, characterized in that generated by the light input to the photodiode and the control voltage input to the current mirror.
According to claim 9,
The feedback circuit,
a transistor that amplifies an input voltage; and
Retinal image processing device characterized in that it comprises a second capacitor connected to the transistor, and accumulating electric charge by the input current.
Receiving an RF radio signal of image data transmitted from an external camera at an antenna of a contact lens platform;
rectifying the RF wireless signal received by the antenna in a power harvester into a DC signal and outputting it as an optical signal; and
A retinal image processing method comprising generating a current signal in response to light incident from the power harvester in a retinal neural circuit inserted into the retina.
According to claim 16,
The step of outputting an optical signal from the power harvester,
AC-coupling the received RF radio signal;
receiving the AC-coupling AC signal and rectifying it into a DC signal;
filtering the rectified DC signal; and
Retinal image processing method comprising the step of outputting the filtered DC signal as an optical signal.
According to claim 16,
The step of generating a current signal in response to the incident light,
generating a current in response to light incident from the current generator;
outputting a current having the same magnitude as the generated current from a current mirror; and receiving the output current from a feedback circuit, controlling the magnitude of the voltage, and returning the current to the current generator.

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