Display Memory Layout for EMI-Safe Pixel Compensation
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Solution Overview
Problem
Display devices face challenges with electromagnetic interference (EMI) between compensation circuits and memories due to varying pixel characteristics, leading to signal disruption and increased power consumption.
Innovation Solution
A display device design with separate non-volatile memories on source and control boards, utilizing a timing controller to manage data transfer and deactivation during power sequences and pixel driving periods, minimizing EMI and reducing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compensation circuit is connected to a memory on the same board, then the connection structure is simple, but electromagnetic interference occurs and signals are disrupted
Solution Approach 1:
The patent divides the memory system into two separate non-volatile memories: one on the source board and one on the control board. This segmentation isolates the compensation circuit from electromagnetic interference while maintaining functional connectivity through coordinated data transfer between the two memory locations.
Solution Approach 2:
The patent introduces an intermediary data transfer mechanism where pixel data is first stored in one non-volatile memory, then transferred to the other non-volatile memory for compensation processing. This intermediary transfer process allows the system to benefit from both close proximity (source board) and isolation (control board) configurations.
2Reliability
If the compensation circuit accesses memory continuously, then real-time compensation is achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic access patterns where the timing controller accesses the first non-volatile memory during power-on sequences and pixel driving periods, then accesses the second non-volatile memory during power-off sequences. This periodic alternation reduces continuous power consumption while maintaining real-time compensation capability.
Solution Approach 2:
The patent performs preliminary data transfer operations by storing pixel data in the first non-volatile memory during active periods, then transferring it to the second non-volatile memory during inactive periods before compensation is needed. This preliminary action allows the system to prepare data in advance, reducing the need for continuous high-power access.
3Speed
If data is stored in volatile memory only, then fast access is achieved, but data loss occurs during power cycles
Solution Approach 1:
The patent changes the memory state parameter by using two different types of non-volatile memories with different characteristics. The first non-volatile memory is optimized for fast write operations during active periods, while the second non-volatile memory is optimized for reliable data retention during inactive periods. This parameter change allows the system to achieve both fast access and reliable data retention.
Solution Approach 2:
The patent provides beforehand cushioning by transferring and storing compensation data in the second non-volatile memory during power-off sequences, ensuring data is preserved and protected before the next power-on event. This prior cushioning prevents data loss during power cycles while maintaining fast access capability when needed.
Data Source
AI summary
A display device includes a display panel in which a plurality of data lines and a plurality of pixels are arranged, a source board including a first non-volatile memory and electrically connected to the display panel, and a control board including a timing controller, a second non-volatile memory, and one or more volatile memories and electrically connected to the source board. Memory access methods of a display device are also disclosed.