Electronic Device Multiplexer Feed-Through Compensation
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Solution Overview
Problem
Conventional display devices experience uneven distribution of positive and negative polarity voltages and common voltage when the multiplexer is turned off, leading to flickering of gray-levels, which affects user experience.
Innovation Solution
An electronic device design featuring a substrate with an active and peripheral area, including electrical components, signal lines, fan-out lines, and switches, where the multiplexer adjusts data signal polarities between data lines and fan-out lines to reduce the feed-through effect and improve gray-level stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the multiplexer is turned off to reduce power consumption, then power saving is achieved, but the feed-through effect occurs causing uneven voltage distribution and gray-level flicker
Solution Approach 1:
A compensation circuit is introduced as an intermediary component between the multiplexer and the data line. This circuit includes a compensation capacitor connected in parallel with the multiplexer and a compensation resistor connected in series with the data line. The compensation circuit acts as a mediator to balance the voltage distribution and eliminate the feed-through effect when the multiplexer is turned off, thus maintaining reliable voltage distribution while enabling power saving mode.
2Use of energy by moving object
If the multiplexer is turned off to reduce power consumption, then power saving is achieved, but gray-level flicker occurs affecting user experience
Solution Approach 1:
The compensation circuit serves as a mediator that prevents the harmful feed-through effect from causing gray-level flicker. By introducing the compensation capacitor and resistor, the circuit maintains stable voltage distribution even when the multiplexer is off, thereby eliminating the harmful flicker effect while preserving power saving benefits.
Solution Approach 2:
The invention converts the harmful feed-through effect into a beneficial balance. The compensation circuit uses the voltage that would otherwise cause flicker and transforms it into a balancing mechanism. The compensation capacitor and resistor work together to equalize voltage distribution, turning the potentially harmful voltage imbalance into a controlled feature that maintains stable gray levels.
3Reliability
If a compensation circuit is added to fix voltage distribution, then voltage uniformity is improved, but device complexity increases
Solution Approach 1:
The invention changes the electrical parameters of the existing multiplexer circuit by adding a compensation capacitor and resistor. Instead of fundamentally redesigning the complex multiplexer structure, the solution modifies the circuit parameters with simple passive components. This approach achieves voltage distribution uniformity through parameter adjustment rather than structural complexity, keeping the circuit design simple and easy to implement.
Data Source
AI summary
An electronic device includes a substrate, an electrical component, a signal line, a fan-out line and a switch. The substrate includes an active area and a peripheral area. The electrical component is disposed on the substrate and in the active area. The signal line is disposed on the substrate and in the active area, and the signal line is coupled to the electrical component. The fan-out line is disposed on the substrate and in the peripheral area. The switch is disposed area and the peripheral area, wherein the switch is coupled between the signal line and the fan-out line. The switch is controlled to transmit a signal from the fan-out line to the signal line during the switch is turned on, and the electrical component is operated in different refreshing frequencies according to the signal.