OLED Display Pixel Brightness Uniformity Correction
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Solution Overview
Problem
Current OLED display manufacturing processes suffer from high rejection rates due to non-uniformities in pixel brightness and uniformity, leading to increased costs and reduced yields, as existing methods require costly correction steps to meet performance specifications.
Innovation Solution
A method that involves manufacturing OLED devices with inherent pixel brightness and uniformity variations, measuring these variations, grading devices based on performance, selling acceptable devices without correction, and selectively correcting non-compliant devices to meet specifications, thereby optimizing the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniformity correction is applied to all OLED devices, then display uniformity is improved, but manufacturing cost increases and yield decreases
Solution Approach 1:
The patent applies uniformity correction selectively only to OLED devices that exhibit non-uniformity above a predetermined threshold, rather than uniformly to all devices. This local quality approach allows acceptable devices to be sold without correction while applying correction only where needed, thereby improving yield and reducing cost while maintaining display uniformity standards.
2Manufacturing precision
If uniformity correction is applied to all OLED devices, then display uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements correction only for devices exceeding the uniformity threshold, avoiding unnecessary correction costs for acceptable devices. This selective local quality approach reduces overall manufacturing cost while maintaining required display uniformity standards.
Solution Approach 2:
The patent applies correction partially rather than universally - only to the extent necessary (devices above threshold) rather than to all devices. This partial action principle reduces manufacturing cost by eliminating redundant correction operations on already-acceptable devices.
Data Source
AI summary
A method for manufacturing and grading OLED devices comprising the steps of: a) manufacturing OLED devices having a plurality of pixels with inherent pixel brightnesses and uniformity variation; b) measuring inherent pixel brightnesses and uniformity variation performance for each of the OLED devices; c) grading each of the OLED devices based on their inherent performance; d) selling OLED devices graded as acceptable without correction of inherent performance; e) correcting pixel brightness and uniformity variation performance for at least some of the OLED devices graded as not acceptable to render them acceptable; and f) selling OLED devices having pixel brightness and uniformity performance correction.