Host Processor DC Component Removal for Display Voltage Compatibility
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Solution Overview
Problem
As the performance and resolution of display apparatuses in mobile devices increase, the amount of transmitted data grows, leading to electromagnetic interference and voltage range issues with existing serial interfaces, causing data transmission failures between host processors and display apparatuses.
Innovation Solution
A host processor with a high-speed driver, coupling circuit, and passive switch that generates and adjusts data voltage by removing DC components and incorporating toggle patterns to ensure data is transmitted within the required voltage range, using capacitors and resistors to set and maintain appropriate DC voltage values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a serial interface is used for data transmission between host processor and display apparatus, then data transmission capability is improved, but voltage range compatibility deteriorates
Solution Approach 1:
The patent changes the voltage parameter of the data signal by removing its DC component and superimposing it on a new DC voltage level that matches the display apparatus's expected voltage range. This parameter transformation enables compatibility between the host processor's output voltage and the display apparatus's input voltage requirements.
Solution Approach 2:
The patent introduces an intermediary circuit between the host processor and display apparatus that acts as a voltage adapter. This intermediary removes the DC component from the incoming data signal and adds a new DC voltage level, effectively mediating the voltage incompatibility between the two devices.
2Adaptability or versatility
If DC component is removed from high-speed data, then voltage range compatibility is improved, but data transmission complexity increases
Solution Approach 1:
The patent extracts the DC component from the high-speed data signal using a coupling circuit, separating this unwanted voltage offset from the data itself. This extraction process simplifies the subsequent voltage adjustment by working only with the AC data component.
Solution Approach 2:
The patent performs preliminary DC component removal before the data enters the main transmission path to the display apparatus. By preprocessing the data signal in advance to remove the DC offset, the system avoids complications that would arise from trying to adjust DC levels throughout the entire transmission chain.
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 normal data transmission between the host processor and display apparatus by adjusting data voltage, preventing DC distortion and ensuring data is within the desired voltage range, thus improving data transmission efficiency and reducing electromagnetic interference.
Implementation Method 1
a coupling circuit which receives the first high-speed data from the high-speed driver and removes a direct-current ('DC') component of the first high-speed data to generate second high-speed data
Implementation Method 2
the coupling circuit may include a capacitor for removing the DC component of the first high-speed data
Implementation Method 3
a first resistor including a first end which receives the power supply voltage and a second end connected to an output node, and a second resistor including a first end that is grounded and a second end connected to the output node
Data Source
AI summary
A host processor includes a high-speed driver which generates first high-speed data, a coupling circuit which receives the first high-speed data from the high-speed driver, and removes a direct-current (“DC”) component of the first high-speed data to generate second high-speed data, a low-power driver which generates low-power data, and a passive switch which receives the second high-speed data from the coupling circuit, receives the low-power data from the low-power driver, and selectively outputs the second high-speed data or the low-power data to a display apparatus.