Source Driver Noise Reduction via Circuit Disabling
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Solution Overview
Problem
Existing display drivers face challenges in accurately monitoring the state of display panels due to noise interference from circuit units, which limits the effective extension of electronic product life.
Innovation Solution
A source driver with a high voltage circuit, low voltage circuit, and sensing circuit is designed, where at least one of the high voltage or low voltage circuits is disabled during part of the analog-to-digital operating period to reduce noise interference, allowing for accurate panel sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high voltage circuit and low voltage circuit operate continuously to drive the display panel, then the display panel can be driven normally, but noise interference is generated during sensing that reduces measurement precision
Solution Approach 1:
The patent applies periodic action by disabling the high voltage circuit and low voltage circuit during specific periods (sampling period and data conversion period) when the sensing circuit needs to operate. This periodic disabling eliminates noise interference from the driving circuits during sensing operations, thereby improving measurement precision without compromising overall display panel driving reliability
Solution Approach 2:
The patent implements preliminary action by disabling the high voltage circuit and low voltage circuit before the sensing circuit performs sampling and data conversion. This advance disabling ensures that no noise is generated during the critical sensing periods, guaranteeing accurate panel state monitoring
2Measurement precision
If the sensing circuit operates during the analog-to-digital operating period to monitor panel state, then measurement capability is improved, but noise interference from circuit units reduces measurement precision
Solution Approach 1:
The patent extracts the harmful noise factor by selectively disabling the high voltage circuit and low voltage circuit during the analog-to-digital operating period. This separation isolates the sensing circuit from noise-generating circuits, allowing accurate panel state monitoring without interference
Solution Approach 2:
The patent uses periodic action by enabling the sensing circuit during specific time windows (sampling period and data conversion period) when the driving circuits are disabled. This temporal separation eliminates noise interference during critical measurement phases
Data Source
AI summary
A source driver and an operating method thereof are provided. The source driver includes a high voltage circuit, a low voltage circuit and a sensing circuit. The low voltage circuit is coupled to the high voltage circuit. The high voltage circuit and low voltage circuit drive a display panel. The sensing circuit is coupled to the low voltage circuit. The sensing circuit senses the display panel during an analog-to-digital operating period. At least one of the high voltage circuit and the low voltage circuit is disabled during at least part of the analog-to-digital operating period.