Multi-Stage Gate Driving Circuit for Simplified Sub-Pixel Integration
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Solution Overview
Problem
Existing display devices lack a gate driving circuit with a simplified structure, which is essential for efficient operation and integration of sub-pixels, particularly in high-resolution applications like VR and AR devices.
Innovation Solution
A gate driving circuit with a simplified structure is designed, incorporating stage circuits with specific transistors and capacitors that maintain voltage differences and control electrical connections based on clock signals, allowing for efficient pixel control and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional gate driving circuit is used, then the display device can operate sub-pixels, but the circuit structure is complex and integration is difficult
Solution Approach 1:
The gate driving circuit is divided into multiple stage circuits (first stage circuit, second stage circuit, etc.), where each stage circuit includes a specific set of transistors (e.g., first to eighth transistors in the first stage circuit) that perform discrete functions. This segmentation allows for modular design and easier integration while maintaining full functionality of the gate driving circuit.
Solution Approach 2:
The patent introduces multiple clock signal phases (first clock signal, second clock signal, third clock signal, fourth clock signal) to control different stages of the circuit. By adding the time dimension through phased clock signals, the circuit achieves complex sequencing functions without increasing spatial complexity, enabling efficient sub-pixel control in high-resolution displays.
2Device complexity
If the gate driving circuit is simplified, then integration improves, but signal control capability may be compromised
Solution Approach 1:
The circuit employs periodic clock signals with different phases (first, second, third, and fourth clock signals) to control the sequential operation of transistors within each stage circuit. This periodic action ensures reliable signal control by systematically enabling and disabling transistors in a predetermined sequence, maintaining signal integrity while using a simplified circuit structure.
Solution Approach 2:
Capacitors are introduced as intermediary elements to store and transfer voltage signals between different transistor stages. The capacitors maintain voltage differences and ensure proper signal levels are transmitted through the simplified circuit, preventing signal degradation despite the reduced circuit complexity.
3Measurement precision
If more transistors and capacitors are added to maintain control precision, then signal control improves, but device complexity increases
Solution Approach 1:
The gate driving circuit is divided into multiple stage circuits, where each stage circuit includes a standardized set of transistors (first to eighth transistors) and capacitors. This segmentation allows voltage control precision to be achieved through modular repetition of functional blocks, rather than through a single complex circuit, thereby maintaining measurement precision while managing device complexity.
Solution Approach 2:
The patent utilizes voltage level changes and phase shifts in clock signals to control the operation of transistors and capacitors. By changing the voltage parameters and timing phases of input signals, the circuit achieves precise voltage control at various nodes without requiring additional complex circuitry, as the same hardware components operate at different voltage levels and timing phases.
Data Source
AI summary
A gate driving circuit includes multiple stage circuits. Any one of the stage circuits may include a first clock signal input terminal, a second clock signal input terminal, an input terminal, an output terminal, a constant voltage terminal, and first to eighth transistors. The transistors may include both N-type and P-type transistors, which may be fabricated in the same processes that fabricate transistors in a pixel circuit. Structure of the gate driving circuit and the display device may thus be simplified.