Display Defect Detection for Brightness Uniformity Hotspots

The patent applies local quality by dividing the display screen into multiple regions (first region, second region, third region) with different brightness characteristics. The detection system specifically targets the first region near the backlight source where hotspot occurs, and the adjustment mechanism modifies local brightness in this region while maintaining appropriate brightness in other regions, thereby achieving overall brightness uniformity.

The patent changes the brightness parameter locally in different regions of the display. The detection apparatus measures brightness values in multiple regions and compares them to determine if the first region exceeds a preset threshold. Based on this comparison, the system adjusts the brightness parameter of the first region downward while maintaining or adjusting other regions to achieve uniform brightness across the entire display.

The patent converts the harmful hotspot effect into a beneficial detection target. By specifically detecting the brightness of the first region where hotspot occurs and comparing it with preset thresholds, the system identifies when the backlight is too effective in this region. The adjustment mechanism then reduces brightness in this specific region, transforming the harmful over-brightness into a controlled and uniform display quality.

The patent implements a feedback mechanism where the detection apparatus continuously monitors brightness values in multiple regions, compares measured values with preset thresholds, and triggers adjustment actions based on the comparison results. This closed-loop feedback system ensures that when the first region's brightness exceeds the threshold (hotspot condition), the system automatically adjusts to reduce it, thereby eliminating the harmful effect while maintaining overall backlight effectiveness.