Display Device Intermediate Layer Segmentation for Leakage Current
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Solution Overview
Problem
Wearable display devices, such as head-mounted displays, face issues with unintended leakage current between adjacent pixels due to the small distance between them, leading to color crosstalk and image quality degradation.
Innovation Solution
The display device incorporates a design where at least a part of the intermediate layer between the pixel electrode and the common electrode is disconnected above a heating line, preventing leakage current and color crosstalk. This is achieved by using a heating line that surrounds the pixels in an Eulerian trail form, disconnecting the intermediate layer through Joule heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between adjacent pixels is reduced to achieve high resolution, then display resolution is improved, but leakage current between pixels increases causing color crosstalk
Solution Approach 1:
The intermediate layer is segmented into multiple regions with different connectivity states. Specifically, the intermediate layer includes a first region that is continuous between adjacent pixels and a second region that is disconnected between adjacent pixels. This segmentation allows the patent to maintain electrical continuity in areas where it is needed while preventing leakage current in areas where pixel isolation is required, thereby resolving the contradiction between high resolution and leakage current prevention.
Solution Approach 2:
The patent applies different structural configurations to different regions of the intermediate layer. The first region has a continuous structure to maintain electrical connectivity, while the second region has a disconnected structure to prevent leakage current. This local differentiation of structural quality allows the patent to optimize each region's function, achieving both high resolution display and effective leakage current prevention simultaneously.
2Object-affected harmful factors
If the intermediate layer is disconnected between adjacent pixels to prevent leakage current, then color crosstalk is reduced, but electrical connectivity may be compromised
Solution Approach 1:
The intermediate layer is divided into functionally distinct regions: a first region maintained as continuous to preserve electrical connectivity for normal pixel operation, and a second region intentionally disconnected to prevent leakage current and color crosstalk between adjacent pixels. This segmentation strategy allows the patent to simultaneously satisfy both connectivity requirements and isolation requirements without compromising overall system reliability.
Solution Approach 2:
Different connectivity qualities are assigned to different regions of the intermediate layer. The first region maintains high electrical connectivity to ensure reliable signal transmission, while the second region implements electrical isolation to prevent harmful leakage current. This localized quality differentiation resolves the contradiction between maintaining connectivity and preventing color crosstalk.
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
This solution effectively prevents leakage current and color crosstalk, enhancing the image quality and reducing user discomfort in wearable display devices by maintaining high-resolution displays without pixel adjacency issues.
Implementation Method 1
an intermediate layer configured to cover the first electrode in the opening and cover the pixel defining layer, and configured to be partially disconnected above the heating line
Data Source
AI summary
A display device is provided. The display device may include a substrate, a driving element layer on the substrate, and a light emitting element layer on the driving element layer. The light emitting element layer may include a pixel defining layer delimiting sub-pixels, a first electrode of each sub-pixel in an opening of the pixel defining layer, a heating line disposed on the pixel defining layer to surround the first electrode of each sub-pixel, an intermediate layer covering the first electrode in the opening and the pixel defining layer and being partially disconnected above the heating line, and a second electrode continuously covering the intermediate layer and the heating line between adjacent sub-pixels while covering the intermediate layer in the opening. The heating line surrounds a pair of first electrodes corresponding to the adjacent sub-pixels in a form of a Eulerian trail.