Array Substrate Peripheral Film Structure for Light Leakage Control
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Solution Overview
Problem
Existing display technologies face challenges with peripheral light leakage, which affects the quality of borderless display products. This issue arises due to static charges and light reflection from detection metal lines, leading to display defects and reduced appearance quality.
Innovation Solution
The proposed solution involves an array substrate with a light-leakage protection film layer at the peripheral region. This film layer includes first film layers with specific light transmittance and reflectivity thresholds, which are formed using the same material and process as the second film layers at the display region. Additionally, grooves are formed in the insulation layer at the peripheral region to further reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-leakage protection film layer is added at the peripheral region, then peripheral light leakage is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing the light-leakage protection film layer specifically at the peripheral region of the array substrate, rather than uniformly across the entire substrate. This localized approach targets the specific area where light leakage occurs (the peripheral region with detection metal lines) while maintaining transparency in the display region, thus reducing harmful effects without unnecessarily increasing overall device complexity.
Solution Approach 2:
The patent segments the array substrate into distinct functional regions: a display region with transparent second film layers and a peripheral region with light-leakage protection first film layers. This segmentation allows different optical properties to be applied to different areas, addressing light leakage at the periphery while preserving display quality in the central region.
2Reliability
If detection metal lines are arranged at the peripheral region, then static charge discharge is enabled, but light reflection causes display defects
Solution Approach 1:
The patent introduces the light-leakage protection film layer as an intermediary between the detection metal lines and the external environment. This film layer serves as a mediator that allows the metal lines to perform their electrical function (static charge discharge) while simultaneously blocking their harmful optical effect (light reflection), thus resolving the contradiction between reliability and harmful factors.
Solution Approach 2:
The patent changes the optical parameters (reflectivity and transmittance) of the peripheral region by applying the light-leakage protection film layer. This parameter change allows the peripheral region to maintain its electrical functionality while modifying its optical properties to prevent light reflection, thereby eliminating display defects without compromising static charge discharge capability.
3Ease of manufacture
If the light-leakage protection film layer uses the same material and process as display region film layers, then manufacturing complexity is reduced, but material suitability must be optimized
Solution Approach 1:
The patent applies universality by using the same material (such as ITO) and manufacturing process for both the light-leakage protection film layer in the peripheral region and the transparent film layers in the display region. This multi-functional approach allows a single material system to serve different purposes: transparency in the display area and light reflection prevention in the peripheral area, thereby simplifying manufacturing while maintaining material property control through optimized thickness and composition.
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 implementation of the light-leakage protection film layer and grooves effectively reduces peripheral light leakage, mitigating display defects and improving the visual appearance of borderless display products by minimizing white or grey sides at the screen edges.
Implementation Method 1
a light transmittance of each first film layer is smaller than or equal to a first threshold, and reflectivity of the first film layer is smaller than or equal to a second threshold
Implementation Method 2
reflectivity of the first film layer is smaller than or equal to a second threshold
Data Source
AI summary
An array substrate, a method for manufacturing the array substrate and a display device. The array substrate includes: a base substrate including a display region and a peripheral region surrounding the display region; and a light-leakage protection film layer formed on the base substrate. The light-leakage protection film layer is arranged at the peripheral region and includes at least one first film layer, a light transmittance of each first film layer is smaller than or equal to a first threshold, and reflectivity of the first film layer is smaller than or equal to a second threshold.