Display Driver Timing Switch for Real-Time Video and Command Modes
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Solution Overview
Problem
Existing electronic devices require power cycling to switch between different display modes, which is inefficient.
Innovation Solution
An electronic device with a display that can switch between video and command modes in real time without turning off, using control circuitry to send mode selection commands and synchronization signals to a display driver integrated circuit to facilitate seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power cycling is used to switch between display modes, then mode switching is achieved, but device downtime increases and efficiency decreases
Solution Approach 1:
The system performs preliminary synchronization of timing information between the applications processor and timing controller before mode switching occurs. The processor sends timing information to the timing controller in advance, and the timing controller synchronizes its internal timing with the processor's timing before the actual mode switch, preventing display artifacts and eliminating the need for power cycling.
Solution Approach 2:
The system dynamically switches the master-slave relationship between the applications processor and timing controller based on operational requirements. In video mode, the processor is master and timing controller is slave; in command mode, this relationship reverses. This dynamic role switching enables flexible mode transitions without power cycling.
2Productivity
If real-time mode switching is implemented, then device efficiency improves, but timing synchronization complexity increases
Solution Approach 1:
The timing controller sends a tearing effect signal to the processor to indicate when it has successfully synchronized with the new timing information. This feedback mechanism allows the processor to confirm synchronization status and proceed with mode switching only when the timing controller is ready, simplifying the control logic despite the increased synchronization requirements.
Data Source
AI summary
An electronic device may include a display, a display driver integrated circuit for controlling the display, and a system processor for running one or more applications on the electronic device. The display may be operated in at least a video mode and a command mode. In the video mode, the system processor operates as the primary timing circuit while the display driver integrated circuit operates as the secondary timing circuit. In the command mode, the display driver integrate circuit operates as the primary timing circuit while the system processor operates as the secondary timing circuit. The system processor may be configured to switch between video mode and the command mode without turning off the electronic device and without turning off the display driver integrated circuit. If desired, the display can be temporarily turned off during a mode switching event to hide potential front of screen artifacts.