Pixel Circuit Transistor Segmentation for Variable Frequency Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display apparatuses supporting variable frequency driving, luminance differences due to bias degrees of driving switching elements cause flicker, affecting display quality.
Innovation Solution
A pixel circuit is designed with a first transistor applying a driving current to a light emitting element and two transistors applying an initialization voltage to its first electrode, connected in series, allowing different control signals to turn them on at different times to generate coupling, reducing luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable frequency driving is implemented, then adaptability is improved, but luminance uniformity deteriorates causing flicker
Solution Approach 1:
The pixel circuit is divided into multiple transistor components (first transistor for driving current, second and third transistors for initialization voltage) that operate independently with different control signals. This segmentation allows each transistor to be optimized for specific frequency ranges, resolving the contradiction between variable frequency adaptability and luminance uniformity by enabling different transistors to dominate at different frequencies.
Solution Approach 2:
The circuit employs dynamic control where the second and third transistors are activated at different times based on driving frequency conditions. The control signals are adjusted dynamically to maintain optimal luminance uniformity across varying frequencies, allowing the system to adapt its internal operation to external frequency changes while preserving display quality.
2Stability of the object's composition
If initialization voltage is applied continuously, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
Instead of continuous initialization voltage application, the circuit uses periodic activation of the second and third transistors based on emission signals and frame timing. The initialization voltage is applied only when needed (periodically synchronized with the display refresh cycle), maintaining luminance uniformity while significantly reducing power consumption compared to continuous application.
Solution Approach 2:
The initialization voltage is applied in advance before the emission phase, preparing the light emitting element for optimal performance. By performing the initialization action preliminarily and temporarily, the circuit ensures luminance uniformity is established before driving begins, then allows the element to operate without continuous initialization, reducing overall power consumption.
Data Source
AI summary
A pixel circuit includes a light emitting element, a first transistor, a second transistor, and a third transistor. The first transistor applies a driving current to the light emitting element. The second transistor and the third transistor apply an initialization voltage to a first electrode of the light emitting element. The second transistor and the third transistor are electrically connected to each other in series.