Display Driving Circuit With Failover Pixel Voltage Path
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Solution Overview
Problem
Liquid crystal display (LCD) panels in automotive systems are prone to damage from external forces, which can render the display driver IC inoperable, leading to a failure in displaying information, posing a safety risk to drivers.
Innovation Solution
A display driving circuit with a source driver and switch circuits, including PMOS transistors and resistors, that applies supply voltage to pixel units when the source driver fails, ensuring continued functionality and safety by enabling the display of warning information even if the source driver is damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driver is used to apply data voltages to pixel units, then normal display operation is achieved, but the system becomes vulnerable to complete failure when the source driver is damaged
Solution Approach 1:
The switch circuits are pre-configured with supply voltage connections and control terminal linkages to the reset terminal, establishing a ready-to-activate backup path before any failure occurs. When the source driver fails, the reset terminal floats and automatically triggers the switch circuits to conduct, applying supply voltage to pixel units without requiring real-time detection or complex control logic.
Solution Approach 2:
The switch circuits act as intermediary components between the supply power and the pixel units, providing an alternative voltage application path when the source driver fails. The control terminal serves as a mediator that links the source driver's operational state to the switch circuits' conduction state, enabling automatic failover without complex control logic.
2Strength
If the display driver IC is protected from external forces, then damage resistance is improved, but the device structure becomes more complex
Solution Approach 1:
The circuit incorporates a pre-configured backup voltage application path through the switch circuits that automatically activates when the source driver is damaged by external forces. This cushioning mechanism ensures that the display system can withstand source driver damage without complete failure, maintaining operational capability through the alternative path provided by the switch circuits.
Data Source
AI summary
A display driving circuit including a source driver and plural switch circuits is provided. The source driver includes plural source line and a control terminal. The source lines are electrically coupled to plural pixel units. The control terminal is for providing a control voltage. Each of the switch circuits includes a select terminal, an input terminal, and an output terminal. The select terminal is electrically coupled to the control terminal. The input terminal is electrically coupled to a supply power so as to apply a supply voltage on the input terminal. The output terminals of the switch circuits are electrically coupled to the pixel units.