Display Driving Circuit Shared Memory AOD Power Reduction
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Solution Overview
Problem
Current display driving circuits for small electronic devices face challenges in reducing power consumption, especially in Always On Display (AOD) modes, as they require separate memory and decoding processes that increase power usage and costs.
Innovation Solution
A display driving circuit that operates in both normal and AOD modes using shared memory, where the AOD mode controller generates control signals using main and additional image data, and internal time information to display images with reduced power consumption by avoiding separate memory and decoding operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If separate memory and decoding processes are used for AOD mode, then image display functionality is maintained, but power consumption increases
Solution Approach 1:
The patent merges the AOD mode memory with the normal mode memory into a single shared memory structure. The memory is configured to store both normal mode image data and AOD mode image data, eliminating the need for separate memory components. This consolidation directly reduces power consumption while maintaining the ability to support both display modes independently.
Solution Approach 2:
The shared memory structure is designed to serve multiple functions: it stores image data for normal mode operation, stores image data for AOD mode operation, and can selectively provide data to different controllers based on the operational mode. This multi-functionality eliminates the need for dedicated separate memory components for AOD mode, thereby reducing overall power consumption.
2Reliability
If separate memory is used for AOD mode, then image data storage is ensured, but manufacturing cost increases
Solution Approach 1:
The patent combines AOD mode memory and normal mode memory into a single integrated memory structure. This merger reduces the total component count and simplifies the manufacturing process, thereby lowering manufacturing costs while ensuring that image data storage reliability is maintained through dedicated storage regions within the shared memory.
Solution Approach 2:
The shared memory structure provides universal storage capability for both normal mode and AOD mode image data. By designing the memory to handle multiple functions, the patent eliminates the need for separate dedicated memory components, reducing manufacturing complexity and cost while maintaining reliable image data storage for both operational modes.
3Use of energy by moving object
If decoding operations are performed in AOD mode, then image quality is maintained, but power consumption increases
Solution Approach 1:
The patent extracts the decoding operation from the AOD mode processing path. The memory is configured to store pre-decoded or directly usable image data for AOD mode, eliminating the need for real-time decoding operations during AOD operation. This extraction of the decoding step significantly reduces power consumption while maintaining adequate image quality for the always-on display function.
Data Source
AI summary
A display driving circuit for driving a display panel, including a first memory configured to store main image data received from outside of the display driving circuit; a second memory configured to store first additional image data in a normal mode, and to store second additional image data in an Always On Display (AOD) mode having lower power consumption than the normal mode; a normal mode controller configured to operate in the normal mode according to the first additional image data stored in the second memory; and an AOD mode controller configured to operate in the AOD mode according to the main image data stored in the first memory and the second additional image data stored in the second memory.