Row Scan Driving Circuit for Region-Specific OLED Refresh
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Solution Overview
Problem
Current OLED display devices face high power consumption and display delay due to the need to refresh the entire screen when only a part of the content needs updating, especially in scenarios requiring different refresh rates for different regions.
Innovation Solution
Implementing a driving signal output circuit with N-type output circuits that selectively output row scan signals based on the refresh requirements of specific display regions, allowing for varying refresh frequencies and reducing the need for sequential progressive scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If progressive scanning is used to refresh the entire screen, then all pixel rows are updated uniformly, but power consumption increases and display delay occurs when only partial content needs refreshing
Solution Approach 1:
The screen is divided into multiple display regions with different refresh rate requirements. Each region can be independently controlled to refresh at its own frequency, allowing high-refresh regions (e.g., video playback) to be updated frequently while low-refresh regions (e.g., static background) are updated less often, thereby reducing overall power consumption while maintaining content refresh completeness.
Solution Approach 2:
Different refresh rates are applied to different regions based on their specific content requirements. The driving signal output circuit generates region-specific scan signals that enable each display region to operate at its optimal refresh frequency, ensuring that each region receives the appropriate quality of service without forcing the entire screen to use the highest refresh rate.
2Reliability
If progressive scanning is used to refresh the entire screen, then all pixel rows are updated in sequence, but display delay increases when only partial content needs updating
Solution Approach 1:
The screen is divided into multiple display regions with different refresh rate requirements. Each region can be independently controlled to refresh at its own frequency, allowing high-refresh regions (e.g., video playback) to be updated frequently while low-refresh regions (e.g., static background) are updated less often, thereby reducing overall power consumption while maintaining content refresh completeness.
Solution Approach 2:
The driving signal output circuit is configured to generate scan signals for specific regions that require updating, rather than sequentially scanning through all regions. This allows the system to proactively refresh only the necessary regions at the appropriate times, reducing display delay for time-sensitive content while avoiding unnecessary scanning of static regions.
3Stability of the object's composition
If the same refresh frequency is applied to the entire screen, then uniform display performance is achieved, but power consumption increases and responsiveness to partial updates deteriorates
Solution Approach 1:
Different refresh rates are applied to different regions based on their specific content requirements. The driving signal output circuit generates region-specific scan signals that enable each display region to operate at its optimal refresh frequency, ensuring that each region receives the appropriate quality of service without forcing the entire screen to use the highest refresh rate.
Solution Approach 2:
The system dynamically adjusts the refresh frequency of each display region based on real-time content requirements. The driving signal output circuit can modify scan signal parameters on-the-fly, enabling regions to transition between different refresh rates as content changes, thus optimizing power consumption while maintaining display performance uniformity through adaptive control.
4Reliability
If sequential scanning is performed across all pixel rows, then complete screen refresh is ensured, but feedback delay increases for IO devices such as active stylus
Solution Approach 1:
The screen is divided into multiple display regions with different refresh rate requirements. Each region can be independently controlled to refresh at its own frequency, allowing high-refresh regions (e.g., video playback) to be updated frequently while low-refresh regions (e.g., static background) are updated less often, thereby reducing overall power consumption while maintaining content refresh completeness.
Solution Approach 2:
The driving signal output circuit is configured to generate scan signals for specific regions that require updating, rather than sequentially scanning through all regions. This allows the system to proactively refresh only the necessary regions at the appropriate times, reducing display delay for time-sensitive content while avoiding unnecessary scanning of static regions.
Data Source
Figure 1~2A
Figure 2B
Figure 2C
AI summary
This application provides a driving signal output circuit, a screen driving circuit, a display screen, and an electronic device. An input end of an N-type output circuit is coupled to a row scan driver. A row address selection signal is inputted to a control end of the N-type output circuit. An output end of the N-type output circuit is coupled to a horizontal scan line. When the row address selection signal is active, the N-type output circuit outputs a row scan signal, to be specific, drives a corresponding pixel row to update corresponding content data. When a row address selection signal outputted by a DDIC is inactive, the N-type output circuit outputs an inactive signal. In this way, refresh of displayed content is carried out at different refresh frequencies based on refresh requirements of different display regions on a display screen, but not at a same refresh frequency on the entire display screen, so that power consumed by the display screen is reduced.