Liquid Crystal Display Frame Frequency Detection and Black Screen Control
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Solution Overview
Problem
Existing liquid crystal displays have limited design freedom and user control over frame frequency ranges, requiring significant internal logic changes and resulting in prolonged wake-up times when transitioning from abnormal to normal states due to their reliance on a single timing controller for abnormal signal detection.
Innovation Solution
A liquid crystal display system that detects frame frequency and generates a DISP signal to selectively output digital video or black data, allowing for precise control of normal and abnormal states without changing the timing controller's logic, and embedding a signal processing unit within the liquid crystal module to autonomously implement black screens, eliminating the need for digital black data production and associated wake-up times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the timing controller alone detects abnormal signals and controls black screen output, then the system structure is simple, but design freedom is reduced and user control over frame frequency ranges is limited
Solution Approach 1:
The patent segments the abnormal signal detection and black screen control functions from the timing controller and assigns them to the liquid crystal module. This segmentation allows the timing controller to maintain its original simple structure while the liquid crystal module gains independent capability to detect frame frequency and control black screen output, thereby increasing design freedom and user control without complicating the overall system.
2Adaptability or versatility
If the timing controller widely sets the normal frame frequency range to increase compatibility, then compatibility is improved, but precise user control is lost
Solution Approach 1:
The patent implements local quality by allowing different parts of the system to have different frame frequency range settings. The liquid crystal module can be configured with specific normal frame frequency ranges (e.g., 48Hz-60Hz, 50Hz-60Hz, or 59.94Hz-60.06Hz) according to user needs, while the timing controller maintains its wide compatibility range. This enables both broad compatibility and precise user control simultaneously.
3Reliability
If digital black data is produced and output to display a black screen during abnormal state, then the abnormal state is detected, but wake-up time is prolonged when transitioning back to normal state
Solution Approach 1:
The patent inverts the conventional approach by having the liquid crystal module directly generate black screen output through its own pixel control logic rather than receiving pre-processed digital black data from the timing controller. When an abnormal signal is detected, the liquid crystal module's signal processing unit directly controls pixel states to display black screen, eliminating the need for digital black data production and reducing wake-up time when transitioning back to normal state.
Data Source
AI summary
A liquid crystal display includes a system and a liquid crystal module. The system detects an input frame frequency, generates a DISP signal indicating the input of an abnormal signal at a high logic level when the detected frame frequency is within a previously determined range, and generates the DISP signal at a low logic level when the detected frame frequency is beyond the previously determined range. The liquid crystal module includes a signal processing unit which selectively outputs digital video data for implementing a normal screen and digital black data for implementing a black screen in response to the DISP signal.