HDMI Display Connection Detection with Auxiliary HPD Voltage Boost
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Solution Overview
Problem
Display devices fail to recognize and output video/audio signals when connected with non-standard HDMI cables due to insufficient voltage supply, leading to unrecognized connections and image output issues.
Innovation Solution
Incorporating an auxiliary power supply and voltage sensor in the display device to detect and boost the voltage to a standard level, ensuring the transmission of a hot plug detect signal even with non-standard HDMI connections, thereby stabilizing the recognition of connected source devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-standard HDMI cable is used, then connection flexibility is improved, but voltage supply becomes insufficient leading to connection recognition failure
Solution Approach 1:
The patent introduces an auxiliary power supply unit as an intermediary component between the HDMI input port and the voltage detector. This auxiliary power supply receives voltage from the HDMI cable (even at low levels) and boosts it to a sufficient level to power the voltage detector, enabling connection recognition to work with non-standard HDMI cables while maintaining reliability
Solution Approach 2:
The patent changes the voltage parameter by introducing an auxiliary power supply that converts the low voltage from non-standard HDMI cables into sufficient voltage levels. The auxiliary power supply detects the input voltage level and provides boosted voltage to the voltage detector, allowing the system to adapt to different voltage conditions and maintain reliable connection recognition
2Reliability
If voltage detection threshold is increased to ensure reliable detection, then detection reliability is improved, but compatibility with low-voltage HDMI cables deteriorates
Solution Approach 1:
The patent segments the voltage detection function into two parts: the auxiliary power supply handles voltage boosting for compatibility with low-voltage cables, while the voltage detector maintains its standard detection threshold for reliability. This segmentation allows each component to optimize its function without compromising the other
Solution Approach 2:
The auxiliary power supply acts as an intermediary that transforms low-voltage signals from non-standard HDMI cables into sufficient voltage levels before they reach the voltage detector. This allows the voltage detector to maintain its standard detection threshold and reliability while the system gains compatibility with low-voltage cables
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 reliable recognition and connection of source devices regardless of voltage levels, ensuring stable video/audio output even with non-standard HDMI cables, improving user experience and device reliability.
Implementation Method 1
a voltage sensor configured to sense a voltage supplied from the source device
Implementation Method 2
a boosting circuit configured to boost the voltage supplied from the source device to the predetermined level or higher
Data Source
AI summary
A display device includes a high definition multimedia interface (HDMI) input port to which an HDMI is connected, an HDMI receiver receiving an HDMI signal from a source device through the HDMI connected to the HDMI input port, a voltage sensor for sensing a voltage supplied from the source device, a hot plug detect (HPD) controller for transmitting an HPD signal to the source device when the voltage detected by the voltage sensor is higher than or equal to a predetermined voltage, and an auxiliary power supply for supplying a voltage higher than or equal to the predetermined voltage to the voltage sensor when the voltage is supplied from the source device.