Liquid Crystal Display Frame Inversion for Flicker Inspection
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Solution Overview
Problem
Liquid crystal displays driven at 120 Hz frame frequency generate a 60 Hz flicker that is not recognizable by the naked eye, making it difficult for inspectors to detect and adjust without separate equipment, increasing costs and time for inspection.
Innovation Solution
A liquid crystal display system that converts a first frame inversion polarity signal into a second frame inversion polarity signal using a timing controller, gate start pulse, and exclusive OR gate to change the frame inversion, allowing recognition of flickers with the naked eye by converting a 60 Hz flicker into a 30 Hz flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquid crystal display is driven with a frame frequency of 120 Hz, then the display performance and moving picture quality are improved, but the flicker frequency becomes 60 Hz which is not recognizable by the naked eye, making inspection difficult
Solution Approach 1:
The patent applies periodic action by implementing frame inversion at specific intervals (every other frame or every fourth frame) to create a detectable flicker pattern. The timing controller inverts the polarity of alternating frames, creating a periodic signal that human eyes can perceive at a lower frequency (30 Hz or 15 Hz) even though the display operates at 120 Hz, thus enabling inspection while maintaining high frame rate performance
2Measurement precision
If separate inspection equipment is used to detect flickers at 120 Hz, then accurate flicker detection is achieved, but the cost and time for inspection increase
Solution Approach 1:
The patent enables self-service inspection by making the display system itself generate a detectable flicker signal through frame inversion. The timing controller automatically creates the inverted frame sequence, and inspectors can use their own eyes to detect the flicker without requiring external measurement equipment, thereby reducing both cost and time while maintaining detection accuracy
Data Source
AI summary
A liquid crystal display for recognizing a flicker with the naked eyes in a step of inspecting a flicker in the case where a liquid crystal display is driven with a frame frequency of 120 Hz is disclosed.In the liquid crystal display, a timing controller supplies a first frame inversion polarity signal which is used at a first frame inversion and, at the same time supplies a gate start pulse which indicates a supply of a scanning pulse. A frame polarity signal converting means converts a first frame inversion polarity signal into a second frame inversion polarity signal in response to the gate start pulse. And a data driver changes the inputted frame into a second frame inversion in response to the second frame inversion polarity signal.