Image Processing Waveform Batching for Lower Display EMI
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Solution Overview
Problem
High signal transmission frequency in image processing devices, particularly in reflective display devices like electronic paper, leads to electromagnetic interference (EMI) issues as image resolution and color increase, impacting display performance.
Innovation Solution
Implementing a controller that stores complete waveform data and transmits it to a driver in batches, allowing the driver to process only a part of the data at a time, reducing signal transmission frequency and minimizing EMI by using a temporary register to buffer data and a timing control circuit to decode and generate driving voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image resolution and color are increased to improve display quality, then display performance is improved, but signal transmission frequency increases causing electromagnetic interference
Solution Approach 1:
The waveform data transmission is divided into multiple batches instead of transmitting all data at once. The controller transmits waveform data in segments across different time periods, which reduces the peak signal transmission frequency and minimizes electromagnetic interference while maintaining high display quality
Solution Approach 2:
The system uses periodic transmission of waveform data batches synchronized with frame periods. By transmitting data periodically in intervals rather than continuously, the signal frequency is reduced, thereby decreasing electromagnetic interference while still delivering high-resolution image data
2Measurement precision
If complete waveform data is transmitted at once to ensure accurate image display, then display accuracy is improved, but signal transmission frequency increases causing electromagnetic interference
Solution Approach 1:
Complete waveform data is segmented into multiple batches transmitted at different times. Each batch contains sufficient information for its corresponding frame period, ensuring display accuracy is maintained while the segmented transmission approach reduces peak signal frequency and electromagnetic interference
Solution Approach 2:
The controller prepares and transmits waveform data batches in advance before each frame period begins. This preliminary action ensures that accurate display data is ready when needed, while spreading transmissions over time reduces instantaneous signal frequency and EMI
Data Source
AI summary
An image processing device, comprising a controller and a driver. The controller is configured to provide an image data and a plurality of waveform data. The image data comprises a plurality of pixel values of a plurality of frame periods, and the plurality of waveform data corresponds to the plurality of frame periods. The driver is coupled to the controller and a display circuit, and is configured to receive the image data and a first part of the plurality of waveform data from the controller. After the driver drives the display circuit according to the first part of the plurality of waveform data, the driver receives a second part of the waveform data from the controller.