Visible Light Modulator for Information Transmission Without Image Degradation
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Solution Overview
Problem
Information such as telephone numbers or URLs displayed on video images can be difficult to see due to being superimposed on the original video, making it hard to view the image effectively.
Innovation Solution
A transmission system that includes a transmitter with a modulator to modulate a luminance signal based on transmission data, generating a second luminance signal that maintains a mean value equal to the first luminance signal during one frame, allowing the video image to be displayed with minimal influence on the displayed information, using visible light emitted by a light source and a driver to control the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If information is superimposed on the video image, then information transmission is achieved, but the video image quality deteriorates and becomes difficult to see
Solution Approach 1:
The patent applies periodic action by modulating the light output of the display device at a frequency higher than the human eye can perceive. The light amount is varied periodically in accordance with the modulation signal, allowing information to be transmitted through the video signal while the average luminance remains constant, thus preventing visible degradation of the video image quality.
Solution Approach 2:
The patent changes the parameter of light output by modulating the light amount of the display device according to the modulation signal. The light amount is varied within a range that does not exceed the minimum luminance value, ensuring that the information is transmitted while the video image quality is maintained.
2Loss of information
If the light amount is modulated to transmit information, then information can be conveyed, but the displayed video image becomes difficult to see
Solution Approach 1:
The patent uses periodic action by modulating the light output at a high frequency that is not perceptible to the human eye. The light amount is varied periodically in accordance with the modulation signal, allowing information transmission while the average luminance remains constant, ensuring the video image remains visible.
Solution Approach 2:
The patent introduces an intermediary approach by using a modulation signal as a carrier that conveys information indirectly. The modulation signal is used to control the light output, and the information is embedded within the variations of the light output, allowing information conveyance without directly affecting the visible video image.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables information transmission while minimizing the impact on the displayed video image, ensuring that the video image quality is maintained and information is easily readable.
Implementation Method 1
one or a plurality of light sources configured to emit a visible light whose light amount corresponds to a first drive signal
Implementation Method 2
a modulator configured to modulate a first luminance signal indicative of an amount of light the light source is configured to emit, according to transmission data to be transmitted from the transmitter to the receiver, to generate a second luminance signal
Implementation Method 3
The receiver includes a light receiver, and a demodulator. The light receiver is configured to receive the video displayed on the display
Data Source
AI summary
According to one embodiment, a transmission system includes a transmitter, and a receiver. The transmitter includes one or a plurality of light sources, a modulator, a first driver, a display, and a second driver. The one or a plurality of light sources is configured to emit a visible light whose light amount corresponds to a first drive signal. The modulator is configured to, according to transmission data to be transmitted from the transmitter to the receiver, modulate a first luminance signal indicative of an amount of the light the light source is configured to emit, to generate a second luminance signal. The first driver is configured to generate the first drive signal based on the second luminance signal. A mean of the second luminance signal during one frame in the input video signal is substantially equal to a value of the first luminance signal in the frame.