Display Driving Circuit Layout for Low-Power Partial Screen Updates
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Solution Overview
Problem
Current display devices, such as watches, can only perform full-screen updates, leading to increased power consumption and reduced battery life due to inefficient partial screen updates.
Innovation Solution
A display driving device with multiple driving circuits, including a first and second driving circuit, each comprising specific transistors and signal generators, allows for partial screen updates by controlling scan and light-emitting signals independently on different sides of the update area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If full-screen updates are performed, then the display can show complete information, but power consumption increases and battery life decreases
Solution Approach 1:
The display screen is divided into multiple independent driving regions (first driving region and second driving region), each controlled by separate driving circuits. This allows selective updating of only the necessary regions rather than the entire screen, reducing power consumption while maintaining complete information display.
Solution Approach 2:
Different driving circuits are assigned to different regions of the display with independent control capabilities. Each region can be updated independently based on local requirements, enabling partial screen updates that preserve information completeness only where needed, thereby reducing overall power consumption.
2Reliability
If full-screen updates are performed, then the display refreshes completely, but battery life is reduced
Solution Approach 1:
The display is segmented into multiple driving regions with independent driving circuits. Each region can be refreshed independently based on update requirements, ensuring complete refresh of necessary areas while avoiding unnecessary refresh of other areas, thus extending battery life.
Solution Approach 2:
Instead of performing excessive full-screen updates, the system performs partial updates only on regions that require refreshing. This partial action approach maintains display reliability for updated regions while significantly reducing power consumption and extending battery life.
3Use of energy by moving object
If multiple driving circuits are used for partial screen updates, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The driving system is segmented into multiple independent driving circuits, each responsible for a specific region. While this increases component count, each circuit is relatively simple and can be implemented using standard display driving technology, making the complexity manageable and worthwhile given the power consumption benefits.
Solution Approach 2:
Each driving circuit is designed with universal functionality to handle both scan signal generation and light-emitting signal control. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity while still enabling partial screen updates to reduce power consumption.
Data Source
AI summary
A display driving device includes an update area, a first driving circuit and a second driving circuit. The first driving circuit includes a first scan signal generator, a first transistor, a second transistor and a second scan signal generator. The first scan signal generator is configured to output a scan signal. A first terminal of the first transistor is coupled to the first scan signal generator and receives the scan signal. A first control terminal of the first transistor is configured to determine whether to output a scan signal. A second terminal of the second transistor is coupled to the first transistor. The second control terminal of the second transistor is configured to determine whether to output the driving partial signal. The second scan signal generator is configured to receive and output the scan signal according to the scan signal and/or the driving part signal.