Display Device Frame Memory Segmentation for Power Reduction
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Solution Overview
Problem
Existing display device driving methods require multiple frame memories to synchronize image data, leading to inefficiencies and increased power consumption due to the need for continuous data writing and reading.
Innovation Solution
A method that writes and reads frame data in a display device using only three frame memories, where each memory operates in a specific pattern of writing and standby modes to reduce the number of frame memories needed, allowing for longer standby periods and thus lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four frame memories are used to store and read frame data during one frame period, then image display synchronization is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the frame memory operations into distinct time segments (first frame period, second frame period, third frame period) and assigns different write/read operations to each segment. This temporal segmentation allows a single frame memory to handle multiple frame data operations sequentially, replacing the need for four simultaneous frame memories with one frame memory that operates across different time periods.
Solution Approach 2:
The patent introduces a time dimension to the frame memory operation by spreading write and read operations across multiple frame periods. Instead of requiring four frame memories operating simultaneously in space, the solution uses one frame memory operating sequentially across time (first frame period, second frame period, third frame period), effectively trading spatial complexity for temporal organization.
2Productivity
If four frame memories operate continuously to maintain image data, then continuous image display is achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic write and read operations across different frame periods. The frame memory alternates between writing first frame data during the first frame period, writing second frame data during the second frame period, and reading frame data during the third frame period. This periodic action pattern allows the frame memory to enter low-power states between active operations, reducing overall power consumption while maintaining continuous image display capability.
Solution Approach 2:
The patent performs preliminary writing of frame data during the first and second frame periods before the actual read operation is needed in the third frame period. This preliminary action ensures that the required frame data is already stored in the frame memory before display is needed, allowing the system to maintain continuous image display while enabling the frame memory to optimize its power consumption by batching operations.
Data Source
AI summary
A method of driving a display device includes a writing operation and a reading operation. The writing operation includes writing first to Mth frame data in a first frame memory during first to Mth frame periods. The reading operation includes reading (L−M)th and (L−M+1)th frame data among the first to Mth frame data from the first frame memory during an Lth frame period. M may be three or more, and L may be an integer ranging from (M+1) to (2M−1). The frame data read from the first frame memory corresponds to an image to be displayed. Reading and writing operations are further performed for remaining ones of the frame memories.