Display Device Light Shielding Layer Moisture Protection
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Solution Overview
Problem
Moisture entering display devices through permeable areas like the black matrix or bank layer can cause display failure by reaching the self-luminous element layer.
Innovation Solution
Incorporating a light shielding layer with openings or slits shifted from the self-luminous element layer and forming cut sections in the circuit substrate's layers to create a moisture shielding structure that prevents moisture from reaching the self-luminous element layer, while also serving as a light leakage prevention structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light shielding layer is positioned directly above the self-luminous element layer, then light shielding effectiveness is improved, but moisture protection is worsened due to direct exposure at edges
Solution Approach 1:
The light shielding layer is shifted from its conventional position directly above the self-luminous element layer to a new position closer to the edge of the counter substrate. This dimensional repositioning creates a protective overhang that prevents moisture ingress while maintaining light shielding functionality, resolving the contradiction between light shielding effectiveness and moisture protection.
Solution Approach 2:
The light shielding layer serves as an intermediary structure that simultaneously provides light shielding and moisture protection. By positioning it to extend toward the edge, it acts as a dual-function barrier that protects the self-luminous element layer from both light leakage and moisture ingress.
2Reliability
If the light shielding layer extends to the edge of the counter substrate, then moisture protection is improved, but light leakage increases due to openings required in the shielding layer
Solution Approach 1:
The light shielding layer is designed with spatially varying properties: it maintains continuity and opacity in regions where light shielding is critical, while creating controlled openings only in areas where moisture protection is the primary concern. This local differentiation allows the structure to simultaneously achieve both moisture protection and light leakage prevention.
Solution Approach 2:
The light shielding layer is segmented into continuous shielding portions and localized opening portions. The openings are strategically positioned to allow moisture protection while the continuous portions maintain light shielding effectiveness, resolving the contradiction between these two functions.
3Reliability
If openings are created in the light shielding layer for moisture protection, then moisture protection is improved, but image quality deteriorates due to increased light leakage
Solution Approach 1:
The openings in the light shielding layer are locally positioned in areas where they do not interfere with the display image quality. By carefully selecting the location and size of openings, the design achieves moisture protection while minimizing impact on image quality, as the openings are placed in non-critical viewing areas.
Solution Approach 2:
The light shielding layer provides excessive light shielding coverage by extending beyond the minimum required area, with openings created only where absolutely necessary for moisture protection. This partial opening approach maintains overall image quality while achieving the necessary moisture protection function.
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 prevents display failure by blocking moisture and minimizing light leakage, thereby extending the device's lifespan and improving image quality by reducing unnecessary light transmission.
Implementation Method 1
a light shielding layer that shields the light from the self-luminous element layer
Implementation Method 2
an edge of the light shielding layer is provided in a position shifted from a cut surface that is one of cut surfaces of the cut section and is closer to the self-luminous element layer toward an edge of the counter substrate
Data Source
AI summary
A display device includes a circuit substrate that is formed of a plurality of layers stacked on each other and including a self-luminous element layer that emits light of controlled luminance from each of a plurality of unit pixels and a counter substrate that includes a light shielding layer that shields the light from the self-luminous element layer and so provided as to face the circuit substrate, and the light shielding layer has an opening so formed in an area shifted from an area facing the self-luminous element layer toward an edge of the counter substrate and along the edge of the counter substrate.