OLED Display Panel Common Layer Segmentation for Light Leakage
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Solution Overview
Problem
Conventional OLED display panels experience light leakage between adjacent sub-pixels due to the close proximity of light-emitting units, leading to reduced display quality, especially noticeable at low current levels.
Innovation Solution
Incorporating a groove with a specific trapezoidal cross-section and a gap in the first and second common layers between adjacent sub-pixel areas, preventing hole leakage between sub-pixels, and using a non-conductive organic or inorganic material for the pixel defining layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between light emitting units is reduced to improve resolution, then display resolution is improved, but light leakage between adjacent sub-pixels occurs
Solution Approach 1:
The first common layer is divided into multiple isolated island structures, with each island positioned over a pixel opening. This segmentation prevents the continuous communication between adjacent common layers, thereby blocking hole leakage pathways while maintaining the layer's hole transport function within each pixel region.
Solution Approach 2:
The harmful continuous structure of the first common layer is extracted and removed between adjacent pixels. By taking out the connecting portions of the common layer, the patent eliminates the leakage pathway while preserving the functional regions over each pixel opening.
2Ease of operation
If the first common layer continuously covers adjacent light emitting cells, then hole transport is improved, but hole leakage to adjacent cells occurs
Solution Approach 1:
The first common layer is segmented into discrete island structures rather than forming a continuous film. Each island is positioned over a pixel opening and is electrically isolated from adjacent islands, allowing hole transport within each pixel while preventing inter-pixel leakage.
Solution Approach 2:
The first common layer exhibits different structural qualities in different regions: it forms continuous coverage over each pixel opening for effective hole transport, but is completely removed in the region between adjacent pixels to prevent leakage. This local quality variation resolves the contradiction between transport efficiency and leakage prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively eliminates light leakage between sub-pixels, enhancing the display quality of OLED panels by maintaining the integrity of light emission within individual pixels.
Implementation Method 1
transferring the holes through the first common layer to the light emitting layer under the action of an electric field between the anode and the cathode, the electrons being transmitted through the second common layer to the light emitting layer
Implementation Method 2
the holes and electrons recombine and then emit light within the light emitting layer
Data Source
AI summary
The present disclosure provides an OLED display panel including a TFT array substrate and a plurality of anodes array arranged on the TFT array substrate, a pixel defining layer is covered on the TFT array substrate, the pixel defining layer includes an opening for exposing the anode and a spacer for spacing two adjacent ones of the anodes, a groove having an upper opening is arranged in the spacer, each of the openings corresponds to a sub-pixel area; wherein, a first common layer, a second common layer and a cathode layer are sequentially arranged on the pixel defining layer, the first common layer, the second common layer and the cathode layer are arranged with a light emitting material unit corresponding to each sub-pixel area. The present disclosure also discloses a method of manufacturing an OLED display panel as described above and a display device including the OLED display panel.