Display Panel Source Driver Switching for Damaged Channels
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Solution Overview
Problem
Electronic devices with display panels face defects due to electrical damage (EOS or ESD) in channel circuits of the source driver, leading to display issues during manufacturing and usage.
Innovation Solution
A method and device that identify damaged channel circuits by measuring signal voltages and comparing them to a reference voltage, disconnecting the damaged circuits, and reconnecting sub-pixels to functional channel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel circuits are continuously operated without detection, then device complexity is reduced, but display reliability deteriorates due to electrical damage accumulation
Solution Approach 1:
The sensing circuit performs preliminary detection of channel circuit status before damage occurs or during off-state, identifying potential electrical damage (EOS/ESD) early. This preliminary action allows the system to prepare for damage compensation by pre-identifying defective channels, thereby improving reliability without requiring complex real-time monitoring during operation.
Solution Approach 2:
The system performs self-diagnosis through the sensing circuit that automatically detects damaged channel circuits and triggers the connection switching mechanism. This self-service capability allows the display device to identify and compensate for its own defects without external intervention, maintaining reliability while avoiding the complexity of external monitoring systems.
2Reliability
If damaged channel circuits are detected and disconnected, then display reliability improves, but device complexity increases due to additional sensing and switching circuits
Solution Approach 1:
The sensing circuit is integrated within the source driver structure, merging the detection function with the existing data driving circuitry. The connection switching mechanism is implemented using switch circuits that are combined with the channel circuit architecture, allowing damage compensation functionality to be added without proportionally increasing overall device complexity.
Solution Approach 2:
The sensing circuit serves multiple functions: it detects damaged channel circuits during off-state, identifies the specific location of electrical damage, and provides information for connection switching. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving improved reliability.
3Productivity
If connection switching is performed during operation, then productivity is maintained, but measurement precision deteriorates due to difficulty in detecting damaged circuits during active state
Solution Approach 1:
The system performs sensing operations periodically during the off-state intervals between display operations. This periodic sensing allows accurate detection of damaged channel circuits when no display data is being transmitted, ensuring measurement precision. The connection switching is then executed during subsequent off-states, allowing productivity to be maintained since switching occurs during natural idle periods rather than disrupting active display operation.
4Reliability
If multiple channel circuits are monitored simultaneously, then reliability improves through comprehensive damage detection, but measurement precision decreases due to difficulty in identifying specific damaged circuits
Solution Approach 1:
The source driver channel circuits are divided into multiple segments or groups, each monitored by corresponding sensing circuits. This segmentation allows the system to monitor multiple channels simultaneously while maintaining the ability to identify specific damaged circuits within each segment. When damage is detected, the precise location can be pinpointed within the segmented structure, resolving the contradiction between comprehensive monitoring and precise identification.
Data Source
AI summary
An electronic device may include: a memory for storing instructions; a processor including processing circuitry; a display panel including a plurality of sub-pixels; and a control circuit including a gate driver for controlling the operation of each of the plurality of sub-pixels, and a source driver for controlling data voltage for each of the plurality of sub-pixels. The source driver may include: a channel circuit set including a plurality of channel circuits connected to each of the plurality of sub-pixels, and a first channel circuit disconnected from the plurality of sub-pixels; and a sensing circuit.