Pixel Circuit Push-Pull Initialization for Accurate Emission Timing
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Solution Overview
Problem
Existing display technologies face challenges in improving emission efficiency and accuracy of emission time in pixel circuits, leading to suboptimal display quality.
Innovation Solution
A pixel circuit design incorporating a driving transistor, light emitting element, pulse signal applying block, and push-pull transistor, where the push-pull transistor applies an initialization voltage to the light emitting element in response to an emission control signal, synchronized with the emission transistor's off-time, enhancing emission control and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light emitting element initialization signal is sequentially applied to pixel-rows, then the display panel can be driven, but the emission efficiency and accuracy of emission time are reduced
Solution Approach 1:
The push-pull transistor applies an initialization voltage to the light emitting element before the emission period. This preliminary initialization action ensures that the light emitting element is properly prepared for emission, eliminating the need for sequential row-by-row initialization and improving both emission efficiency and timing accuracy.
Solution Approach 2:
The push-pull transistor dynamically switches between applying initialization voltage and allowing normal emission operation based on the emission control signal. This dynamic control enables the system to transition smoothly between initialization and emission modes, improving emission efficiency without compromising timing accuracy.
2Reliability
If a dedicated driver for initialization is used, then initialization can be controlled, but the device complexity increases
Solution Approach 1:
The push-pull transistor serves multiple functions: it acts as both an initialization driver and part of the emission control circuitry. By integrating the initialization function into the existing transistor structure rather than adding a dedicated driver, the system achieves reliable initialization control without increasing device complexity.
Solution Approach 2:
The initialization function is merged with the emission control circuitry through the push-pull transistor. The emission control signal simultaneously controls both the emission process and the initialization voltage application, combining multiple functions into a single integrated control mechanism and reducing overall device complexity.
Data Source
AI summary
A pixel circuit includes a driving transistor which generates a driving current based on a data signal, a light emitting element which emits light based on the driving current, a pulse signal applying block which outputs an emission control signal based on a pulse data voltage and a timing signal and a push-pull transistor which applies an initialization voltage to a first electrode of the light emitting element in response to the emission control signal. The light emitting element may stop emitting based on the emission control signal.