Scan And Sense Driving Circuits for Variable Refresh Rates
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Solution Overview
Problem
Existing display devices struggle to efficiently display images at various refresh rates, impacting visibility and power consumption.
Innovation Solution
A scan driving circuit with multiple scan and sense stage circuits that output carry and scan/sense signals, utilizing transistors and capacitors to manage node voltages and signal timing for flexible frame transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display devices operate at high refresh rates to improve visibility and reduce flicker, then image quality and user experience are improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic refresh rate adjustment where the display device can operate at different refresh rates (e.g., 120Hz during active periods, 60Hz during idle periods). The scan driving circuit dynamically controls the timing of scan signals and sense signals to enable flexible frame rate changes, allowing the system to adapt between high visibility mode (higher refresh rate) and low power consumption mode (lower refresh rate) based on usage conditions
Solution Approach 2:
The patent utilizes periodic scanning of pixel rows through sequential activation of scan stage circuits. Each scan stage circuit sequentially activates pixel rows in a periodic manner, enabling the display to refresh images at controlled intervals. This periodic action allows efficient power management by adjusting the frequency of scanning operations while maintaining adequate visibility through optimized scan/sense signal timing
2Use of energy by moving object
If the display device displays images at various refresh rates to optimize power consumption, then energy efficiency is improved, but visibility and image quality deteriorate
Solution Approach 1:
The scan driving circuit dynamically adjusts the timing and frequency of scan signals based on operational mode. During high-visibility requirements, the circuit generates scan signals at higher frequencies with optimized timing. During power-saving modes, it reduces scan signal frequency while maintaining adequate visibility through intelligent frame rate adjustment and coordinated sense signal timing
Solution Approach 2:
The patent changes critical timing parameters of scan and sense signals to optimize performance at different refresh rates. By adjusting parameters such as scan signal pulse width, sense signal timing offset, and frame synchronization parameters, the system maintains visibility quality across various refresh rates while optimizing power consumption
3Speed
If frequent frame transitions are made to display dynamic content, then responsiveness to content changes is improved, but power consumption increases
Solution Approach 1:
The scan driving circuit dynamically adjusts frame transition timing based on content type and user activity detection. For dynamic content requiring frequent updates, the system increases frame transition frequency. For static content, it reduces transition frequency to conserve power. The coordinated timing of scan and sense signals enables smooth transitions while optimizing energy usage
Solution Approach 2:
The patent implements preliminary sense signal generation during scan periods to prepare frame data in advance. By sensing and preparing frame information during available time windows, the system can execute faster frame transitions when needed without proportionally increasing power consumption, as the preparatory work is performed during efficient scanning intervals
Data Source
AI summary
A scan driving circuit including scan stage circuits that each output a first carry signal and a scan signal, and sense stage circuits that each output a second carry signal and a sense signal. Each of the scan stage circuits receives the first carry signal from at least one preceding or subsequent scan stage circuit. Each of the sense stage circuits receives the second carry signal from at least one preceding or subsequent sense stage circuit. Each of the plurality of sense stage circuits receives the first carry signal from one of the at least one preceding or subsequent scan stage circuit.