Protocol Conversion Circuit for DisplayPort Panel Replay Compatibility
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Solution Overview
Problem
The Panel Replay function in the DisplayPort standard is limited to DP-related products, preventing other specifications from benefiting from its power-saving capabilities.
Innovation Solution
A protocol conversion circuit and method that extends the Panel Replay function to non-DP compliant products by using a DP signal receiver, control analysis circuit, frame buffer, and downstream transmitter to convert video data between different formats and modes, including live and panel replay functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the Panel Replay function is implemented using the DisplayPort standard, then power saving capability is improved, but device compatibility deteriorates because it is limited to DP-related products only
Solution Approach 1:
The patent implements a protocol conversion circuit that enables the Panel Replay function to work across multiple display interfaces (DP, HDMI, VGA) by converting between different protocols. The circuit includes a DP signal receiver, control analysis circuit, frame buffer, and downstream transmitter that can output multiple signal types, making the power-saving function universal across different device specifications rather than DP-exclusive
Solution Approach 2:
The protocol conversion circuit acts as an intermediary between the DP source device and non-DP display devices. It receives DP signals with Panel Replay functionality, processes them through the frame buffer, and converts them to compatible formats for HDMI, VGA, or other displays, thereby enabling DP-exclusive features to work with non-DP devices
2Adaptability or versatility
If the protocol conversion circuit is added to extend Panel Replay function, then device compatibility is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single protocol conversion circuit module that includes the DP signal receiver, control analysis circuit, frame buffer, and downstream transmitter. By combining these components into one integrated unit rather than separate systems, the patent reduces overall system complexity while maintaining multi-interface compatibility and Panel Replay functionality
Data Source
AI summary
A protocol conversion circuit and a protocol conversion method are provided. The protocol conversion circuit includes a DisplayPort™ (DP) receiver, a control analysis circuit, a downstream transmitter and a frame buffer. The DP receiver analyzes a DP signal to obtain video data and packet information. The control analysis circuit determines whether the packet information indicates that a live function or a panel replay (PR) function is activated, and controls, in response to determining that the live function is activated, the frame buffer to store received current video data and transmits it to the downstream transmitter; and controls the frame buffer to discard the received current video data, or update previous video data stored in the frame buffer with a specified range in the current video data, and sends latest video data to the downstream transmitter, so as to output a target signal to the second electronic device.