LCD Backlight Timing Control for Afterimage Elimination
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Solution Overview
Problem
Conventional eSports displays suffer from afterimages due to slow response times in IPS and VA panel types, which affect image clarity.
Innovation Solution
A liquid crystal display (LCD) system incorporating a driving circuit that adjusts the illuminating time of an LED backlight module based on the response time and writing period of the LCD panel to eliminate afterimages, ensuring clearer images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If IPS or VA display panels are used to achieve good color display and large viewing angles, then color quality and viewing angle are improved, but response time increases causing afterimages
Solution Approach 1:
The patent applies periodic action by dividing the backlight illumination into multiple discrete time points within each refresh period. The backlight module illuminates at specific moments (first illuminating time, second illuminating time, etc.) rather than continuously, which allows the liquid crystal to complete its response before the next illumination occurs, thereby eliminating afterimages while maintaining good color display quality
Solution Approach 2:
The patent uses preliminary action by pre-calculating and setting the illuminating times based on the liquid crystal's response time characteristics. The driving circuit determines the optimal illuminating times in advance according to the writing period and response time parameters, ensuring that illumination occurs at the most appropriate moments to avoid afterimage effects
2Illumination intensity
If continuous backlight illumination is used to maintain brightness, then brightness is maintained, but afterimages occur due to slow liquid crystal deflection
Solution Approach 1:
The patent transforms continuous backlight illumination into periodic illumination with multiple discrete illuminating times within each refresh period. This periodic action allows the liquid crystal to complete its deflection and stabilization before each illumination event, eliminating afterimages while maintaining perceived brightness through strategic timing of illumination events
Solution Approach 2:
The patent applies dynamics by making the backlight illumination timing adaptive to the liquid crystal's response characteristics. The driving circuit dynamically determines the illuminating times based on the response time and writing period, creating a dynamic synchronization between backlight illumination and liquid crystal state changes to prevent afterimage formation
Data Source
AI summary
A liquid crystal display and a display calibration method thereof are provided. The display calibration method includes the following steps. A liquid crystal display panel is driven by a driving circuit to display an image. A light-emitting diode backlight module is driven by the driving circuit to provide a backlight to the liquid crystal display panel, wherein the driving circuit determines at least one illuminating time of the light-emitting diode backlight module according to a response time of the liquid crystal display panel and a writing period of at least one target display area of the liquid crystal display panel.