Pixel Circuit With Short-Period Alternating Signals for Emission Efficiency
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Solution Overview
Problem
The efficiency of light emitting elements in display devices is variable based on the applied signal, and existing technologies do not effectively enhance emission efficiency.
Innovation Solution
A pixel circuit that applies an alternating signal with a short period to the light emitting element, utilizing a voltage applier, alternating signal generator, and emission controller, including a ring oscillator with odd-numbered inverter circuits, to improve emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional DC signal is applied to the light emitting element, then the circuit structure is simple, but the emission efficiency is low
Solution Approach 1:
The patent applies periodic alternating signals to the light emitting element instead of conventional DC signals. The alternating signal generator produces signals that switch between first and second voltage levels, creating periodic current flow through the light emitting element. This periodic action improves emission efficiency by preventing efficiency degradation that occurs with continuous DC operation, while the circuit complexity is managed through systematic design of the alternating signal generator using standard transistor components.
2Productivity
If an alternating signal is applied to improve emission efficiency, then the emission efficiency increases, but the circuit complexity increases
Solution Approach 1:
The pixel circuit is segmented into distinct functional modules: voltage applier, alternating signal generator, and emission controller. Each module performs a specific function and can be independently optimized. The alternating signal generator is further segmented into multiple transistors (first through fourth transistors) that work in coordination to generate the alternating signal, allowing for systematic design and optimization of the signal generation process while maintaining overall circuit manageability.
Solution Approach 2:
The circuit employs dynamic voltage application through the alternating signal generator, which switches between different voltage levels (first voltage level and second voltage level) to create time-varying current flow. This dynamic operation allows the light emitting element to operate in alternating modes that improve emission efficiency, while the structured transistor configuration provides a systematic approach to managing the increased circuit complexity.
Data Source
AI summary
A pixel circuit includes a voltage applier which generates an alternating control voltage based on a data voltage and a sweep voltage, an alternating signal generator which outputs an alternating signal based on the alternating control voltage, an emission controller which applies a driving current to a light emitting element in response to an emission signal and the alternating signal, and the light emitting element connected to the emission controller.