Dual Shielding Layer Display Panel for Reflected Light Suppression
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Solution Overview
Problem
Display panels without polarizer plates face issues with reflected light from alignment keys in the non-display area, which distracts viewers and reduces luminous efficiency.
Innovation Solution
A display panel design featuring a substrate with an alignment key, a planarization layer, and a dual shielding layer system where the second shielding layer has a smaller opening hole than the first, with a distance between the perimeter of the opening hole and the alignment key of 5 to 50 μm, and a transmittance of 10% or less in the 680 nm wavelength band, to minimize reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer plate is disposed on the substrate to suppress reflected light, then reflected light is suppressed, but luminous efficiency decreases
Solution Approach 1:
The patent extracts and removes the polarizer plate from the display panel structure, replacing it with a dual shielding layer system that achieves light suppression without the energy losses associated with polarizers
Solution Approach 2:
The patent employs composite material structures in the shielding layers, combining different materials with complementary properties to achieve both light suppression and maintained luminous efficiency
2Object-affected harmful factors
If the opening hole of the first shielding layer is made smaller to reduce reflected light, then reflected light is reduced, but alignment precision deteriorates
Solution Approach 1:
The patent divides the light suppression function into two separate shielding layers with different opening hole sizes and positions, allowing each layer to serve a specific function: the first layer maintains alignment precision with larger openings, while the second layer suppresses reflected light with smaller openings
Solution Approach 2:
The patent applies different opening hole dimensions to different shielding layers based on their specific functional requirements, with the first shielding layer having larger openings for alignment and the second having smaller openings for light suppression
3Object-affected harmful factors
If the distance between the opening hole perimeter and alignment key is reduced to minimize reflected light, then reflected light is minimized, but alignment precision deteriorates
Solution Approach 1:
The patent segments the light suppression function across two shielding layers, allowing the first layer to maintain larger distances for alignment precision while the second layer operates with smaller distances for effective light suppression
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 suppresses reflected light in the non-display area, enhancing viewer immersion and maintaining luminous efficiency without the need for a polarizer plate.
Implementation Method 1
reflected light from metal electrodes and lines are being replaced with a low-reflective metal
Implementation Method 2
a black matrix layer configured to extend over the alignment key and have a fourth opening hole overlapping with a top of the alignment key in plan view
Data Source
AI summary
Disclosed herein are a display panel capable of reducing the amount of reflected light in a non-display area where an alignment key is disposed, and a display device employing the same. The display panel includes a substrate having a display area and a non-display area, an alignment key disposed on a first surface of the substrate, and a planarization layer disposed on the first surface of the substrate and having a via hole above the alignment key. The display panel also includes a first shielding layer disposed on a second surface of the substrate opposite the first surface and having a first opening hole overlapping with the alignment key in plan view, and a second shielding layer disposed on the planarization layer.