Display Driver Circuit with Pre-Output Noise Detection
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Solution Overview
Problem
Existing driver ICs for liquid crystal displays are susceptible to external noise, such as ESD, which can alter or destroy display control data, leading to abnormal image display, and existing countermeasures that detect abnormalities after the fact may not prevent the occurrence of abnormal display on the panel.
Innovation Solution
A driver circuit with integrated noise detection circuits and a mask control mechanism that checks the logic of multiple register circuits to ensure no abnormality before outputting display control data, using decision circuits to generate a decision result that controls the output of display data based on the absence of noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If display control data is held in register circuits inside the driver IC, then display control function is achieved, but the data may be altered or destroyed by external noise such as ESD
Solution Approach 1:
The patent applies preliminary action by performing noise detection and abnormality determination before the display control data is output to the display panel. The decision circuit evaluates the state of register circuits and generates a decision result in advance, preventing abnormal data from being displayed. This proactive approach ensures that potential noise-induced errors are caught and blocked before they can affect the displayed image.
Solution Approach 2:
The patent introduces an intermediary mechanism between the register circuits and the display output. The decision circuit acts as a mediator that receives data from register circuits, evaluates its validity through logical operations, and only allows properly validated data to pass through to the display control output. This intermediary layer protects the system by filtering out corrupted data caused by external noise.
2Measurement precision
If external device reads out and collates data to detect abnormalities, then abnormality detection capability is improved, but abnormal display may have already occurred by the time detection happens
Solution Approach 1:
The patent implements preliminary action by performing abnormality detection within the driver IC itself before data is sent to the display panel. The decision circuit continuously monitors the state of register circuits and determines abnormalities in real-time, generating mask signals immediately when issues are detected. This eliminates the time delay inherent in external detection methods, preventing abnormal display from occurring in the first place.
Solution Approach 2:
The patent extracts the abnormality detection function from the external device and integrates it directly into the driver IC. By incorporating the decision circuit within the driver IC, the system performs self-diagnosis and self-protection, removing the dependency on external devices for timely detection. This extraction enables faster response time and prevents the lag that allows abnormal display to occur.
3Reliability
If mask control circuit prevents output of display control data based on decision result, then abnormal display is prevented, but circuit complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the driver IC into functionally distinct modules: register circuits for data storage, decision circuit for abnormality evaluation, and mask control circuit for output management. Each segment performs a specific function, making the overall complex system manageable through modular design. The decision circuit uses segmented logical operations to evaluate different aspects of data integrity independently before generating the final mask signal.
Data Source
AI summary
A driver circuit that displays received display data on a display panel is provided. The driver circuit includes: a first register circuit, holding display control data used for controlling display of the display data on a display panel and outputting the display control data at a predetermined timing; multiple second register circuits, holding decision data with predetermined logic; a decision circuit, outputting a decision result indicating no abnormality has occurred in response to a logic of decision data held in second register circuits being a predetermined logic, respectively, and display control data held in the first register circuit being active; and a mask control circuit, controlling so that display control data held in the first register circuit is output to a circuit that performs display control of the display panel in response to a decision result output from the decision circuit indicating that no abnormality has occurred.