DisplayPort Wake Signal Validation in Low-Power Display Modes
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Solution Overview
Problem
Display devices convert to a power-on mode when receiving noise signals in a power-saving mode, leading to power waste and potential malfunctions.
Innovation Solution
A display device with a communication interface and processor that identifies input signals as noise or valid, determining whether to maintain or switch power modes based on address values and DPM modes of connected devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device converts to DPM on mode upon receiving any input signal in DPM off mode, then the display device can respond to valid signals, but it also responds to noise signals causing power waste and potential malfunctions
Solution Approach 1:
The display device performs preliminary actions by activating the DP interface in advance during the second DPM off mode before fully transitioning to DPM on mode. This allows the device to inspect incoming signals in a controlled environment, validating their authenticity before committing to full operational mode, thereby preventing both missed valid signals and unnecessary power consumption from noise signals
Solution Approach 2:
The patent introduces a second DPM off mode as an intermediary state between the first DPM off mode and DPM on mode. This intermediate state serves as a buffer where signal validation occurs, allowing the display device to distinguish between valid and noise signals before fully activating, thus resolving the contradiction between responsiveness and power efficiency
2Loss of energy
If the display device maintains DPM off mode despite receiving input signals, then power consumption is reduced, but valid signals may be missed causing display malfunctions
Solution Approach 1:
The display device dynamically adjusts its power management state based on signal validation results. When a valid signal is detected during the second DPM off mode, the device dynamically transitions to DPM on mode to ensure proper signal processing. This dynamic adaptation allows the system to maintain power efficiency while ensuring reliable signal response, resolving the contradiction between energy saving and functional reliability
3Ease of operation
If the DP interface is activated in the first DPM off mode, then signal reception is possible, but power consumption increases unnecessarily
Solution Approach 1:
The patent segments the power management states into three distinct modes: first DPM off mode (full power down), second DPM off mode (partial power up with DP interface activated), and DPM on mode (full operation). This segmentation allows the display device to activate only the necessary components (DP interface) for signal reception without activating the complete system, thereby reducing unnecessary power consumption while maintaining signal reception capability
Data Source
AI summary
A display device includes: a communication interface including a Display Port (DP) interface, and configured to communicate with a first external device; memory storing at least one instruction; and at least one processor operatively connected to the communication interface and the memory, and configured to control the display device, where the at least one instruction, when executed by the at least one processor, causes the display device to: in a state in which a Display Power Management (DPM) mode of the display device corresponds to a first DPM off mode, based on an input signal being received from the first external device, changing the DPM mode of the display device to a second DPM off mode; identify whether the input signal is a noise signal; and determine whether to change the DPM mode of the display device from the second DPM off mode to a DPM on mode.