Dual-Processor Display Panel Partial Refresh Latency
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Solution Overview
Problem
E-book devices using E-paper displays (EPD) face long latency in responding to touch operations due to the time required for full-screen image refresh, and they have a large size due to the inclusion of multiple devices like the drive mainboard, display integrated circuit, and display panel.
Innovation Solution
A display device with a drive mainboard featuring two processors, one for image loading and processing, and another for serial-to-parallel conversion and transmitting images to the display panel via N parallel slave input signals, allowing for partial image refresh and reducing the need for a display IC between the drive mainboard and the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-screen image refresh is performed on E-paper display, then complete image update is achieved, but response latency increases
Solution Approach 1:
The patent segments the image refresh operation into two modes: full-screen refresh for complete updates and partial refresh for localized updates. The display controller identifies changed regions and performs refresh operations only on those specific areas, dividing the refresh task into manageable segments rather than updating the entire screen uniformly.
Solution Approach 2:
The patent implements partial refresh action by updating only the necessary portions of the display screen rather than performing excessive full-screen refresh operations. The display controller determines which regions require updates and applies refresh operations selectively, reducing overall refresh time while maintaining image quality.
2Reliability
If multiple devices (drive mainboard, display IC, display panel) are included, then display functionality is achieved, but device size increases
Solution Approach 1:
The patent merges the display controller functionality directly into the drive mainboard, eliminating the need for a separate display IC. The drive mainboard integrates the control logic for image processing and display management, combining multiple functions into a single device and reducing the overall component count and device volume.
Solution Approach 2:
The drive mainboard is designed with multi-functionality, serving both as the primary processing unit and as the display controller. It handles image processing, data management, and display control functions that were previously distributed across separate components, making the drive mainboard a universal control device.
Data Source
AI summary
Provided is a display device, including: a display panel and a drive mainboard. The drive mainboard includes a first processor and a second processor. The second processor is electrically connected to the first processor and the display panel. The first processor is configured to acquire data of an image changed portion in response to a control instruction and output the data of the image changed portion to the second processor. The control instruction is issued for controlling a partial change of an image displayed on the display panel. The second processor is configured to output N slave input signals to the display panel. The N slave input signals carry the data of the image changed portion, wherein N is a positive integer greater than 1. The display panel is configured to perform partial image refresh based on the data of the image changed portion.