Pixel Circuit Reducing Power Consumption by Minimizing Current Path Components
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Solution Overview
Problem
Current pixel circuits in display panels face challenges in reducing power consumption due to increased overall voltage across the current path caused by multiple components in the driving current path of LEDs.
Innovation Solution
The proposed pixel circuit design includes a driving transistor, a capacitor, a reset transistor, and a writing transistor, where during the emission period, only the driving transistor and the light emitting element are in the current path, reducing the number of components and thus the overall voltage across the current path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more components are disposed in the current path to provide driving current to the LED, then the current path can support more functional requirements, but the overall voltage across the current path increases, resulting in greater power consumption
Solution Approach 1:
The patent employs dynamic control of transistor switching states to optimize the current path configuration. During different operating phases (reset phase, writing phase, emission phase), different transistors are activated or deactivated to create the most efficient current path for each function, thereby reducing overall voltage drop and power consumption while maintaining functional versatility
Solution Approach 2:
The pixel circuit is divided into multiple functional modules with dedicated transistors (reset transistor, writing transistor, driving transistor) that operate independently in different time phases. This segmentation allows each component to perform its specific function only when needed, reducing the number of components simultaneously active in the current path and thereby reducing power consumption
2Ease of operation
If more components are disposed in the current path, then the circuit can perform reset and writing functions, but the number of components in the current path increases, leading to higher overall voltage
Solution Approach 1:
The patent implements periodic operation cycles with distinct phases: reset phase, writing phase, and emission phase. During each phase, only the necessary transistors are activated (reset transistor during reset phase, writing transistor during writing phase, driving transistor during emission phase), ensuring that minimal components are present in the current path at any given time while still providing all required functions
Solution Approach 2:
The gate terminal of the driving transistor serves as an intermediary node that receives control signals from different transistors at different times. This intermediary approach allows the circuit to switch between different operational modes without requiring all components to be simultaneously connected in the current path, thereby reducing overall component count and voltage drop
Data Source
AI summary
A pixel circuit includes a driving transistor, a capacitor, a reset transistor and a writing transistor. One end of the capacitor receives an emission control signal, and the other end of the capacitor is coupled to a gate terminal of the driving transistor. The reset transistor is coupled between an initial voltage terminal and the gate terminal of the driving transistor. The writing transistor is coupled between a data line and the gate terminal of the driving transistor. When the driving transistor is turned on according to the emission control signal, the driving transistor generates a driving current to drive a light emitting element, and at the same time, both the reset transistor and the writing transistor are turned off. There are only the driving transistor and the light emitting element disposed in a current path that provides the driving current.