Video Signal Processing Circuit Invalid Bit Polarity Control
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Solution Overview
Problem
Existing video signal processing circuits face challenges in reducing Electromagnetic Interference (EMI) emissions, particularly when invalid bits are present in the transmission format, leading to increased EMI peak noises due to uncontrolled polarity changes in gray-level data transmission.
Innovation Solution
A video signal processing circuit that dynamically sets the polarity of invalid bits based on the count of low and high levels in the input video signal, ensuring the polarity matches the majority of valid bits, thereby minimizing waveform changes and reducing EMI emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of ports is increased to support high definition and larger display panels, then the transmission capacity is improved, but the unwanted peak noise caused by video signal increases
Solution Approach 1:
The invention changes the polarity parameter of invalid bits dynamically based on the content of valid bits. By adjusting the polarity state of invalid bits to match the majority polarity of valid bits, the system reduces unwanted EMI peak noises while maintaining the increased number of ports required for high definition displays.
2Device complexity
If the polarity of invalid bits is not controlled, then the device complexity is reduced, but the EMI emission levels increase
Solution Approach 1:
The system makes invalid bits self-adjusting by automatically matching their polarity to the majority polarity of valid bits. This self-service mechanism reduces EMI emissions without requiring external control circuits or additional complexity, as the invalid bits adapt themselves based on the valid bit content.
3Object-affected harmful factors
If shield members are increased to reduce EMI emissions, then the EMI protection is improved, but the device complexity and cost increase
Solution Approach 1:
The invention converts the previously harmful uncontrolled polarity changes of invalid bits into a beneficial mechanism. By controlling invalid bit polarity to match valid bits, the system transforms what was a source of EMI noise into a means of reducing EMI emissions, eliminating the need for additional shield members.
Data Source
AI summary
There is provided a video signal processing method for performing predetermined signal processing on an input video signal to transmit an output video signal in a form of a specified transmission format through a video signal line including invalid bit polarity setting processing to be performed by an invalid bit polarity setting unit, wherein, when there exists an invalid bit having no data corresponding to data making up the input video signal in the specified transmission format of the output video signal, to count the number of low and high levels of gray-level data of the input video signal to compare a numerical size between the number of low levels and the number of high levels for judgment and to set a polarity of the invalid bit based on the judgment result.