OLED Display Panel Central Defect Elimination via Split Scanning
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Solution Overview
Problem
Large OLED display panels often experience defects or artifacts at the central portion due to discontinuous scanning, leading to reduced display quality.
Innovation Solution
The display panel is divided into upper and lower portions, with different scanning start points and timings for each portion, allowing for continuous scanning and synchronized data voltage output during vertical blank durations to prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel is divided into upper and lower portions with different scan start points, then display quality is improved by eliminating central stains, but device complexity increases due to multiple gate drivers and timing controllers
Solution Approach 1:
The display panel is divided into upper and lower portions, each driven by separate gate drivers with different scan start points. This segmentation allows independent timing control for each portion, enabling continuous scanning across the entire panel and eliminating the central stain defect that occurs with single-point scanning.
Solution Approach 2:
The patent introduces a temporal dimension to the scanning process by implementing different scan start points in the vertical direction. The upper portion scans from one edge while the lower portion scans from the opposite edge, creating overlapping scan windows that ensure continuous coverage and eliminate dead zones at the center.
2Duration of action of moving object
If the second scan start point is earlier than the first scan start point by vertical blank duration, then continuous scanning is achieved, but timing control complexity increases
Solution Approach 1:
The second gate driver is configured to start scanning earlier than the first gate driver by exactly the vertical blank duration. This preliminary action ensures that when the first portion completes its scan, the second portion is already positioned to continue scanning without interruption, achieving continuous scanning coverage.
Solution Approach 2:
By offsetting the scan start points of the upper and lower portions by the vertical blank duration, the patent ensures that scanning activity is continuous across the entire display panel. The scan windows of both portions overlap in time, eliminating any gaps in the scanning process and maintaining continuous useful action.
Data Source
AI summary
A display apparatus includes a display panel having a first portion and a second portion, a gate driver configured to drive a first gate line group in the first portion of the display panel starting at a first scan start point and to drive a second gate line group in the second portion of the display panel starting at a second scan start point, the second scan start point being different from the first scan start point, a first data driver configured to output a first data voltage to a first data line group in the first portion and a second data driver configured to output a second data voltage to a second data line group in the second portion.