Scan Driver Segmentation for Partial Region Power Optimization
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Solution Overview
Problem
In display devices, especially in portable devices like smartphones and tablets, reducing power consumption is a challenge, particularly when displaying still images or partial images on the panel, as existing low-frequency driving techniques do not effectively reduce power consumption when the entire panel is not in use.
Innovation Solution
A scan driver is designed with multiple stages, each including a control circuit, carry output circuit, enable node controlling circuit, masking circuit, and scan output circuit, allowing for the generation of scan signals at different driving frequencies across various regions of the display panel by controlling voltages and enabling signals, enabling efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low frequency driving technique is applied to reduce power consumption, then power consumption is reduced, but the technique cannot be effectively applied when still image is not displayed in entirety of the display panel region
Solution Approach 1:
The display panel is divided into multiple regions (first region and second region) with different driving frequencies. The scan driver is segmented into multiple stages, where each stage corresponds to a specific region and can operate independently at different frequencies, enabling partial region low-frequency driving while maintaining normal driving in other regions.
Solution Approach 2:
The scan driver dynamically adjusts the driving frequency of different regions based on display content requirements. When still images are displayed in specific regions, those regions operate at low frequency to save power, while other regions continue normal operation, making the system adaptable to various display scenarios.
2Reliability
If the entirety of the display panel region is driven at normal driving frequency, then display performance is maintained, but power consumption cannot be reduced
Solution Approach 1:
Different regions of the display panel are assigned different driving frequencies based on their specific display requirements. Regions displaying still images use low-frequency driving for power savings, while regions displaying moving images or requiring high performance maintain normal driving frequency, achieving localized optimization of both performance and power consumption.
3Use of energy by moving object
If scan signals are provided at different driving frequencies to respective regions, then power consumption is optimized, but device complexity increases
Solution Approach 1:
The scan driver is divided into multiple independent stages, with each stage responsible for generating scan signals for a specific region. This segmentation allows each stage to operate at different frequencies independently, managing complexity through modular design while enabling region-specific frequency control for power optimization.
Solution Approach 2:
Each stage of the scan driver is designed with multi-functionality, capable of operating at both normal and low driving frequencies. The stages can function independently or in coordination, providing universal functionality that adapts to different display requirements without requiring entirely separate circuitry for each region.
Data Source
AI summary
A scan driver includes a plurality of stages. Each of the plurality of stages includes a control circuit which controls a voltage of a first node and a voltage of a second node in response to an input signal, a first clock signal and a second clock signal, a carry output circuit which outputs a carry signal in response to the voltage of the first node and the voltage of the second node, an enable node controlling circuit which controls a voltage of an enable node in response to the carry signal, an enable signal and an inverted enable signal, a masking circuit which controls a voltage of a third node in response to the voltage of the second node and the voltage of the enable node, and a scan output circuit which outputs a scan signal in response to the voltage of the first node and the voltage of the third node.