Display Data Driver Signal Compensation by Channel Length
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Solution Overview
Problem
Existing display devices experience varying signal loss amounts in data signals due to differing lengths of data signal channels, affecting data driver chips differently.
Innovation Solution
A display device with a timing controller that adjusts emphasis voltage and/or swing level of data signals based on the length of data signal channels and error information to compensate for these losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single emphasis voltage is applied to all data driver chips, then the device complexity is reduced, but the signal quality becomes inconsistent across different data driver chips due to varying channel lengths
Solution Approach 1:
The patent applies different emphasis voltages to different data driver chips based on their specific channel lengths. The timing controller determines the channel length for each data driver chip and applies a customized emphasis voltage accordingly, making the control parameter (emphasis voltage) location-dependent to compensate for varying signal losses.
Solution Approach 2:
The emphasis voltage is made dynamic and adjustable rather than fixed. The timing controller can modify the emphasis voltage level based on real-time channel length information and signal quality requirements, allowing the system to adapt to different transmission conditions for each data driver chip.
2Reliability
If the emphasis voltage is increased for data driver chips with longer channels, then the signal loss is compensated, but the energy consumption increases
Solution Approach 1:
The patent changes the emphasis voltage parameter dynamically based on channel length. Rather than using a fixed high voltage for all chips, the system adjusts the voltage level to match the specific channel characteristics, applying higher voltages only where necessary to maintain signal quality while minimizing unnecessary energy consumption.
Solution Approach 2:
The patent applies emphasis voltage selectively and proportionally rather than uniformly to all data driver chips. Chips with shorter channels receive lower or no emphasis voltage, while only chips with longer channels receive higher emphasis voltage, avoiding excessive energy consumption in cases where it is not needed.
3Reliability
If the timing controller adjusts emphasis voltage for each data driver chip based on channel length, then the signal quality consistency is improved, but the device complexity increases
Solution Approach 1:
The timing controller performs preliminary determination of channel lengths for each data driver chip and pre-calculates the appropriate emphasis voltages before actual data transmission. This advance preparation allows the system to implement complex per-chip voltage adjustment without adding significant runtime complexity to the data transmission process.
Solution Approach 2:
The system implements a feedback mechanism where the timing controller receives information about channel lengths from data driver chips or detection circuits, uses this feedback to determine appropriate emphasis voltages, and adjusts the voltage accordingly. This closed-loop control enables automatic adaptation to varying channel conditions.
Data Source
AI summary
A display device includes a display panel including pixels, data driver chips configured to provide data voltages to the pixels, and a timing controller configured to control the data driver chips and to provide a data signal and an emphasis voltage to each of the data driver chips. Here, the emphasis voltage is adjusted according to a length of a data signal channel that connects the timing controller to each of the data driver chips.