Shared Pixel Compensation Circuit for High-Frame-Rate Displays
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Solution Overview
Problem
Existing display devices face challenges in reducing signal wiring and power wiring to overcome resolution constraints, particularly in high-frame frequency operations, leading to increased complexity and inefficiency.
Innovation Solution
A display device design where individual pixels share a common circuit with adjacent pixels, utilizing transistors and capacitors to perform compensation operations without affecting neighboring pixels, thereby reducing the number of elements and signal wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If individual pixels are given separate circuits for high-speed driving and variable frequency driving, then high-frame frequency operation capability is improved, but the number of elements and signal wiring increases
Solution Approach 1:
Adjacent pixels share a common compensation circuit including compensation transistors and capacitors. The compensation transistor gate is connected to a shared compensation line, and compensation capacitors are connected to a shared compensation node, allowing multiple pixels to perform compensation operations simultaneously using shared circuit elements.
Solution Approach 2:
The common circuit components serve multiple functions: the compensation transistor performs threshold voltage compensation for multiple pixels, the compensation capacitor stores compensation voltage for adjacent pixels, and the emission transistor controls light output while also participating in compensation operations for shared pixels.
2Adaptability or versatility
If more signal wiring and power wiring are added to support high-frame frequency operations, then variable frequency driving capability is improved, but wiring complexity and resolution constraints worsen
Solution Approach 1:
Multiple pixels share common data lines, compensation lines, and power voltage lines. The emission electrodes of adjacent pixels are connected to a common emission line, and power voltage lines are shared among multiple pixels, reducing the total number of wiring required in the display device.
Solution Approach 2:
The patent implements sharing in the spatial dimension by connecting adjacent pixels (e.g., pixels in the same row or column) to common circuit elements, effectively reducing wiring complexity through dimensional organization of shared resources.
Data Source
AI summary
A display device includes a first light-emitting element, a second light-emitting element, a first transistor configured to connect a first data line and a first node based on a first signal, a first capacitor connected to the first node, a second transistor connected between the first light-emitting element and a common node, and configured to provide a first current based on the first voltage to the first light-emitting element, a third transistor configured to connect the first data line and a second node based on a second signal, a second capacitor connected to the second node, a fourth transistor connected between the second light-emitting element and the common node, and configured to provide a second current based on the second voltage to the second light-emitting element, and a fifth transistor configured to connect a power voltage line and the common node.