Display Panel Light-Shielding Structure for Backward Light Control
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Solution Overview
Problem
Self-luminous displays face issues with light emission directionality, where light emitted by light-emitting units propagates not only towards the intended direction but also towards non-target directions, affecting the operation of light-collecting modules such as camera or fingerprint recognition systems.
Innovation Solution
A display panel design incorporating a substrate, light-emitting units with a micro-cavity structure, a pixel defining layer with opening and non-opening portions, and a light-shielding layer that overlaps with the second electrode but not the first opening, to redirect and shield interference light emitted towards the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a self-luminous display is used to provide bright and vibrant images, then display quality is improved, but light propagates in non-target directions and affects light-collecting modules
Solution Approach 1:
The patent extracts and removes the harmful back-propagating light from the system by introducing a light-shielding layer. This layer specifically blocks light that propagates backward toward the substrate, preventing it from reaching the light-collecting module while preserving the forward light output for display purposes.
Solution Approach 2:
The light-shielding layer acts as an intermediary element positioned between the light-emitting unit and the substrate. It mediates the light propagation by selectively blocking harmful backward-propagating light while allowing the display function to continue operating normally.
2Reliability
If a light-shielding layer is added to block interference light, then operation of light-collecting module is improved, but device structure becomes more complex
Solution Approach 1:
The light-shielding layer is designed to serve multiple functions: it blocks interference light from reaching the light-collecting module, maintains display brightness, and integrates with the existing pixel defining layer structure. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The light-shielding layer is combined with the pixel defining layer to form an integrated structure. By merging these functions into a single layered component, the patent reduces structural complexity while achieving both light blocking and pixel definition functions.
3Object-affected harmful factors
If the light-shielding layer completely blocks light, then interference light is reduced, but normal lighting conditions are affected
Solution Approach 1:
The light-shielding layer is designed with local quality - it selectively blocks light only in the backward propagation direction toward the substrate, while allowing light to pass through in the forward direction toward the display side. This directional selectivity ensures interference light is reduced without affecting normal display lighting.
Solution Approach 2:
The light-shielding layer is segmented into specific regions: a first region that blocks interference light and a second region that allows normal light transmission. This segmentation enables differential light control - blocking harmful light while preserving useful light for display.
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
The solution effectively reduces the intensity of interference light emitted towards the substrate, preventing it from affecting light-collecting modules and enhancing their operation performance while maintaining normal lighting conditions.
Implementation Method 1
The light-shielding layer is located at a side of the non-opening portion facing towards the substrate... to reduce the intensity of light emitted through a side, which is away from light-emitting units, of a substrate
Implementation Method 2
at least a part of the light-emitting layer is located in the opening portion... In the direction perpendicular to the plane of the substrate, the first electrode is located in the opening portion
Data Source
AI summary
A display panel and a display apparatus are provided. The display panel includes a light-emitting unit, a pixel defining layer, and a light-shielding layer. The light-emitting unit includes first and second electrodes, and a light-emitting layer. The pixel defining layer includes an opening portion where the light-emitting layer is partially located, and a non-opening portion. The first electrode is located in the opening portion in a direction perpendicular to a plane of the substrate and includes first and second openings. In the direction perpendicular to the plane of the substrate, the light-shielding layer does not overlap with the first opening. Orthographic projections of the light-shielding layer and the first electrode on the plane of the substrate are first and second projections, respectively. In a first direction, a difference between a length of the second opening and a sum of lengths of the first and second projections satisfies a preset threshold.