DC Level Redistribution for Display Chips Using Inverted Signal Sequencing
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Solution Overview
Problem
Existing DC level redistribution methods for display system chips either require separate negative pins, which is not feasible for highly integrated chips, or fail to fix positive signal voltage levels at assigned absolute voltages, leading to inefficiencies in signal processing.
Innovation Solution
A method and apparatus that fix the DC level of a designated positive signal as a reference to adjust the negative signal, and then use the adjusted negative signal to adjust the DC levels of other positive signals, allowing for shared negative pins and fixed positive signal voltages, implemented using a DC level redistributing apparatus with clamping and adjusting circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the first approach (fix negative signals first, then fine-tune positive signals) is used, then negative pins can be shared, but the voltage levels of positive signals cannot be fixed at their assigned absolute voltages
Solution Approach 1:
The patent inverts the conventional DC level redistribution sequence by fixing positive signal levels first and then adjusting negative signal levels, rather than the traditional approach of fixing negative signals first. This inversion allows both pin sharing and accurate voltage level fixation to be achieved simultaneously.
Solution Approach 2:
The patent changes the parameter adjustment sequence by first establishing fixed DC levels for positive signals and then using those fixed levels as references to adjust negative signal levels, enabling both pin sharing and precise voltage control.
2Manufacturing precision
If the second approach (fix positive signals first, then fine-tune negative signals) is used, then the voltage levels of positive signals can be fixed at their assigned absolute voltages, but separate negative pins are required
Solution Approach 1:
The patent applies the inversion principle by reversing the conventional adjustment sequence - instead of adjusting negative signals first and then positive signals, it fixes positive signal levels first and then adjusts negative signals, thereby achieving both voltage precision and pin reduction.
Solution Approach 2:
The patent segments the DC level adjustment process into two distinct phases: first fixing positive signal levels independently, then adjusting negative signal levels based on those fixed references, allowing for both precision and resource efficiency.
3Object-affected harmful factors
If AC-coupling techniques are used to convert single-ended signals to differential signals, then noise performance is improved, but DC level redistribution becomes necessary and complex
Solution Approach 1:
The patent simplifies DC level redistribution by inverting the adjustment sequence - fixing positive signal levels first and then using them as references for negative signals, thereby reducing complexity while maintaining noise performance benefits of AC-coupling.
Data Source
AI summary
A DC level redistribution method includes the steps of: receiving all positive signals and one negative signal of a plurality of pairs of differential signals; fixing a DC level of a positive signal of a designated pair of differential signals among a plurality of pairs of differential signals as a reference in order to adjust a DC level of a negative signal of the designated pair of differential signals for generating an adjusted negative signal; and taking the adjusted negative signal of the designated pair of differential signals as a reference in order to adjust DC levels of the positive signals of the other pairs of differential signals excluding the designated pair of differential signals. The DC redistribution method may be used in a display system.