Projector Synchronized Source Device Activation via CEC
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Solution Overview
Problem
In image display systems using projectors, the existing methods for controlling source devices such as hard disk recorders and DVD players via CEC commands are inefficient, particularly when multiple source devices are connected, leading to prolonged activation times for the projector and source devices.
Innovation Solution
A projector with an interface section for multiple connection terminals, a projecting section, storage control section for identification information, power-supply control section, and control information generation section that determines and generates CEC commands to synchronize the power supply of the projector and source devices, allowing simultaneous activation or deactivation of suitable source devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projector waits for the source device to activate before becoming projectable, then the source device can be activated in tandem with the projector, but the time during which the image is to be in a displayable state becomes excessively long
Solution Approach 1:
The projector transmits the power-supply ON command to the source device in advance, before the source device has fully activated. This preliminary action allows the source device activation process to begin earlier, reducing the overall activation time while ensuring synchronized operation between the projector and source device.
2Loss of time
If the projector transmits power-supply ON command to the source device when the source device activation time is long, then the projector can become projectable faster, but the source device may not be fully ready to receive and process the command
Solution Approach 1:
The system dynamically adjusts the timing of command transmission based on the activation characteristics of the source device. The projector transmits the power-supply ON command at an optimized moment that balances the need for fast activation with ensuring the source device is ready to receive and process the command, making the activation process adaptive rather than fixed.
3Reliability
If the projector needs to select a suitable source device among multiple connected devices, then the system can ensure the correct device is activated, but the activation process becomes more complex and time-consuming
Solution Approach 1:
The projector automatically selects and activates the appropriate source device without requiring manual user intervention for device selection. The system uses pre-stored identification information to autonomously determine which source device should be activated, simplifying the user experience while maintaining reliable device selection through automated processes.
4Ease of operation
If the projector stores and uses identification information for source devices, then the system can automatically select and activate the correct device, but the control system becomes more complex
Solution Approach 1:
The projector pre-stores identification information for connected source devices in advance. This preliminary storage of device identifiers allows the system to quickly and automatically select the appropriate source device when activation is requested, eliminating the need for complex real-time selection algorithms and simplifying the control process.
Data Source
AI summary
A projector includes: an interface section that has a plurality of connection terminals receiving image information from source devices, a projecting section that projects an image, a storage control section that stores identification information that denotes the source device, an instruction information input section accepting instruction information, a power-supply, a power-supply control section that controles the power-supply, a determination section, and a control information generation section that generates control information, wherein, in a case where the determination section determines that the instruction information is information of designating switching on the power-supply, the power-supply control section switches on the power-supply, the control information generation section generates switching on control information designating switching on the source device that is denoted with the identification information, and the interface section outputs the switching on control information to the source device that is denoted with the identification information.