OLED Display Panel Maintenance Assisting Line for Defective Pixel Repair
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Solution Overview
Problem
The manufacturing of OLED display devices is hindered by defective pixels, which are either dark spots or bright spots due to poor driving circuit performance, leading to reduced yield and display quality, as existing methods are inadequate in addressing both types effectively.
Innovation Solution
A display panel design featuring a maintenance assisting line between adjacent pixel units, which electrically couples the first electrodes of adjacent pixel units if one pixel's light emitting region is poorly driven, ensuring no dark or bright spots appear, thereby improving yield and display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common fix method cuts off driving of bright spots to make them dark spots, then bright spots are eliminated, but too many dark spots seriously affect the yield of the display device
Solution Approach 1:
The patent introduces a maintenance assisting line as an intermediary component between adjacent pixel units. This auxiliary conductive line can electrically couple first electrodes of adjacent pixel units when driving failures occur, serving as a mediator to transfer driving signals from functional pixels to defective pixels, thereby eliminating both bright spots and dark spots without sacrificing yield
Solution Approach 2:
The maintenance assisting line is pre-configured in the display panel structure during manufacturing, positioned between adjacent pixel units and electrically connected to first electrodes. This preliminary preparation enables rapid response to driving failures without requiring complex post-manufacturing modifications, thus preserving manufacturing yield while ensuring display quality
2Adaptability or versatility
If driving circuit region has complicated circuits and dense signal lines, then display functionality is achieved, but probability of occurrence of failure increases
Solution Approach 1:
The maintenance assisting line acts as a pre-prepared backup pathway that cushions against potential driving failures. When circuit failures occur in the complicated driving circuit region, the maintenance assisting line provides an alternative electrical connection path, compensating for the inherent reliability risks of dense circuit arrangements while maintaining full display functionality
3Reliability
If maintenance assisting line electrically couples first electrodes of adjacent pixel units, then defective pixels are eliminated, but additional structure is added to the display panel
Solution Approach 1:
The maintenance assisting line is strategically positioned only between adjacent pixel units where driving failures are most likely to occur and where electrical coupling can be most effective. This localized approach provides the necessary reliability improvement without adding excessive structure throughout the entire display panel, thus balancing functionality enhancement with structural simplicity
Data Source
AI summary
The present disclosure provides a display panel, a display device comprising such a display panel, and a method for processing defective pixels of such a display panel. The display panel comprises: a substrate; a plurality of pixel units on the substrate and arranged in an array. Each of the pixel units includes a light emitting region and a driving circuit region. In each of the pixel units, the driving circuit region includes a transistor, the light emitting region includes a first electrode, and the first electrode is electrically coupled to a first terminal of the transistor. In a row direction or a column direction of the plurality of pixel units arranged in an array, light emitting regions of two adjacent pixel units are adjacent to each other.