Bidirectional Scan Driving Circuit Detection Pin Reduction
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Solution Overview
Problem
Existing display panel technologies cannot detect both forward and backward scan functions of a bidirectional scan driving circuit using a single detection signal pin, leading to increased detection pin count and costs.
Innovation Solution
A display panel design with a scan driving circuit and a first gating circuit that uses a single detection signal pin to detect both forward and backward scan functions by controlling switch units to turn on and off during respective detection stages, allowing the same pin to receive detection signals for both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate detection pins are used for forward and backward scan functions, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The detection signal pin is configured to perform multiple functions: it can detect both the forward scan function and the backward scan function of the scan driving circuit. By making the detection pin universal, the patent avoids increasing the number of pins while maintaining the ability to detect both scan directions accurately.
Solution Approach 2:
The gating circuit acts as an intermediary between the scan driving circuit and the detection signal pin. It selectively connects different nodes (first node for forward scan, second node for backward scan) to the single detection pin based on the detection mode, enabling the pin to detect both functions without direct permanent connections to all nodes.
2Device complexity
If a single detection pin is used for both forward and backward scan detection, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The gating circuit dynamically switches its connection state based on the detection mode. When detecting forward scan, it connects the first node to the detection pin; when detecting backward scan, it connects the second node to the detection pin. This dynamic switching allows a single pin to accurately detect both functions at different times.
Solution Approach 2:
The detection process is divided into periodic stages: forward scan detection stage and backward scan detection stage. During each stage, the gating circuit is configured appropriately for that specific detection type, allowing the single detection pin to maintain accuracy for the current detection function while preparing for the next.
Data Source
AI summary
A display panel includes a scan driving circuit, signal pins and a first gating circuit. Signal pins include a detection signal pin and an enable signal pin. The scan driving circuit includes scan drive units disposed in a cascade manner. The first gating circuit includes a first switch unit and a second switch unit. An input terminal of the first switch unit is electrically connected to a scan signal detection terminal of an Nth-stage scan drive unit. An input terminal of the second switch unit is electrically connected to a scan signal detection terminal of a first-stage scan drive unit. An output terminal of the first switch unit and an output terminal of the second switch unit are both electrically connected to the detection signal pin. The first switch unit is configured to turn on in a forward scan detection stage and turn off in a backward scan detection stage. The second switch unit is configured to turn on in the backward scan detection stage and turn off in the backward scan detection stage.