Display Controller Rescan Pattern for Boundary Brightness Uniformity
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Solution Overview
Problem
Display panels experience non-uniform brightness issues at boundaries due to differing panel loads between blanking and display time intervals, leading to dim or bright lines that affect design quality.
Innovation Solution
A system and method that includes a memory to store input data patterns for display lines, a comparator to compare pixel data differences between adjacent intervals, and a display controller to determine a rescan pattern using a look-up table, adjusting pixel data during blanking intervals to maintain coherent display characteristics like brightness and dimming effects across intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel operates with different panel loads between blanking and display time intervals, then the display can achieve normal operation and timing, but non-uniform brightness (dim lines or bright lines) appears at display boundaries
Solution Approach 1:
The patent applies preliminary action by performing a rescan operation during the blanking time interval before the actual display interval. The display controller rescans the same line data (e.g., line N-1) during the blanking period, which prepares the display electrodes and liquid crystal molecules in advance, ensuring they are properly aligned and charged before the actual display interval begins. This preliminary rescan action eliminates the brightness non-uniformity that would otherwise appear at the boundaries when the panel transitions from blanking to display mode.
2Device complexity
If the first few display lines after blanking interval are displayed with normal pixel data, then the display can maintain simple data flow, but brightness non-uniformity appears at the boundaries
Solution Approach 1:
The patent applies segmentation by dividing the display lines into two categories: boundary lines (first few lines after blanking interval) and normal lines. The display controller identifies boundary lines and applies a special rescan operation specifically to these lines, while normal lines are displayed with standard pixel data. This segmented approach targets only the problematic boundary regions, maintaining simple data flow for the majority of lines while correcting brightness uniformity issues where they occur.
3Illumination intensity
If the panel load is increased to achieve higher resolution and brightness, then display performance improves, but non-uniformities at display boundaries become more critical
Solution Approach 1:
The patent applies preliminary anti-action by counteracting the panel load effect during the blanking time interval through the rescan operation. When the panel load is high (as in high-resolution displays), the liquid crystal molecules and display electrodes require more time to stabilize. The rescan operation during blanking pre-charges and pre-aligns the display elements, counteracting the delayed response caused by high panel load. This preliminary anti-action ensures that when the actual display interval begins, the boundary lines display with uniform brightness matching the rest of the display, even under high panel load conditions.
Data Source
AI summary
Disclosed is a system and method for enhancing display uniformity at display boundaries. A memory stores multiple input data patterns comprising pixel data to be displayed for multiple display time intervals. A comparator receives input data patterns for a preceding time interval. The comparator compares the difference between a pixel data associated with a pixel of a current line and a preceding line with a predefined threshold. A display controller determines a rescan pattern corresponding to a blanking time interval between the preceding display time interval and a current display time interval by driving the pixel data using a look-up table. The display panel displays the input data patterns corresponding to current display time interval after the blanking time interval having the rescan pattern such that coherency amongst display characteristics of the current display time interval and the preceding display time interval is achieved.