Semiconductor Sequential Circuit Duty Control for Reliable Signal Output
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Solution Overview
Problem
Variations in transistor threshold voltage in sequential circuits of driver circuits lead to failures in outputting desired signals, hindering image display and increasing manufacturing costs.
Innovation Solution
A semiconductor device comprising first to third transistors, a capacitor, and specific wiring configurations, with pulse signals having duty ratios of 55% or lower, and a signal generation circuit with duty ratios of 1% or lower, to stabilize transistor thresholds and reduce voltage stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors are used in sequential circuits of driver circuits, then the device can function as intended, but variations in transistor threshold voltage lead to failures in outputting desired signals
Solution Approach 1:
The patent applies parameter changes by utilizing pulse signals with specific duty ratios (55% or lower, and 1% or lower) to dynamically control transistor operation. This changes the electrical parameters applied to transistors to compensate for threshold voltage variations, ensuring reliable signal output despite manufacturing variations in transistor characteristics.
2Area of stationary object
If system-on-panel is implemented to form driver circuits over the same substrate as pixel portion, then screen occupancy rate increases and bezel narrows, but fabrication complexity increases
Solution Approach 1:
The patent implements universality by using the same substrate for both pixel portions and driver circuits, creating a system-on-panel structure. This multi-functional substrate simultaneously serves as the display area and the circuit integration platform, eliminating the need for separate driver circuit boards and reducing overall device complexity despite the increased area utilization.
3Reliability
If pulse signals with duty ratios of 55% or lower are supplied to stabilize transistor thresholds, then signal output reliability improves, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by using pulse signals with specific duty ratios (55% or lower, and 1% or lower) that periodically control transistor switching. This periodic signal application stabilizes transistor thresholds through repeated conditioning cycles while managing energy consumption through the controlled duty ratio that limits continuous power dissipation.
Data Source
AI summary
A highly reliable semiconductor device is provided. The semiconductor device includes first to third transistors and a capacitor. In the first transistor, one of a source and a drain is supplied with a first signal, the other of the source and the drain is connected to a gate of the second transistor and one electrode of the capacitor, and a gate is supplied with a second pulse signal. In the second transistor, one of a source and a drain is supplied with a first pulse signal, and the other of the source and the drain is connected to the other electrode of the capacitor and one of a source and a drain of the third transistor. In the third transistor, the other of the source and the drain is supplied with the first potential, and a gate is supplied with a second signal that is an inverted signal of the first signal. The first pulse signal is a clock signal, and the second pulse signal has a duty ratio of 55% or lower.