Display Signal Source Switching with Operating-State Tracking
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Solution Overview
Problem
Existing display devices with switching circuits fail to smoothly switch to the intended signal source due to multiple signal source devices sending active source commands simultaneously in response to a hot plug detect signal, causing confusion and user inconvenience.
Innovation Solution
A display device with a control circuit that records the current operating state of each signal source device and uses this information to selectively switch the image signal source based on the received active source commands, ignoring commands from devices in the wrong state to ensure smooth switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple signal source devices are connected to the switching circuit, then the number of HDMI ports is expanded, but multiple devices send active source commands simultaneously causing switching failure
Solution Approach 1:
The control circuit performs preliminary action by recording the operating states of all signal source devices before the switching process. When a signal source switching command is received, the control circuit has already captured the state information (power-on/power-off status) of each device, enabling it to make informed switching decisions without confusion from simultaneous active source commands.
2Measurement precision
If the control circuit records operating states before switching, then switching accuracy is improved, but device complexity increases
Solution Approach 1:
The control circuit acts as an intermediary between the switching command and the actual signal source selection. It receives the signal source switching command, consults the recorded operating states as reference information, and then determines the appropriate target signal source device. This intermediary role allows accurate switching without requiring complex simultaneous command processing.
Data Source
AI summary
A display device and a signal source switching method therefore are provided. The display device is connected with a first signal source device and a second signal source device and includes a switching circuit, a receiver circuit and a control circuit. The switching circuit includes a first connection port and a second connection port, which are respectively connected to the first signal source device and the second signal source device. When the control circuit receives a signal source switching command, the control circuit records a current operating state of each of the first signal source device and the second signal source device. When the control circuit receives an active source command from the first signal source device, the control circuit refers to the current operating state to control the switching circuit to switch the image signal source to the first signal source device or the second signal source device.