Light-Shielding Wall in Groove for Display Oxide Semiconductor
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Solution Overview
Problem
Current display devices using polymer-dispersed liquid crystals face challenges in suppressing illumination light from reaching the switching elements, which can lead to degradation of the oxide semiconductor and undesired shifts in threshold voltage, affecting reliability.
Innovation Solution
Incorporating a first light-shielding wall in a groove between the oxide semiconductor and the light-emitting module, and optionally additional light-shielding structures, to block illumination light and prevent it from reaching the switching element, thereby reducing degradation and maintaining reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-shielding structure is added to block illumination light from reaching the switching element, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The light-shielding wall is nested within the groove formed in the inorganic insulating film, integrating the light-shielding function into the existing layered structure without adding separate external components. This nesting approach blocks illumination light from reaching the oxide semiconductor while minimizing additional structural complexity.
Solution Approach 2:
The light-shielding wall extends in the thickness direction (third direction) of the substrate, utilizing the vertical dimension to block light paths that would otherwise reach the switching element. This dimensional approach effectively shields the oxide semiconductor from illumination light while maintaining a compact planar footprint.
2Object-affected harmful factors
If the groove depth is increased to improve light blocking, then the light-shielding effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light-shielding wall is positioned specifically within the groove at the location where illumination light would reach the oxide semiconductor, concentrating the light-blocking function at the critical interface between the light-emitting module and the switching element. This localized approach maximizes light-shielding effectiveness without requiring excessive groove depth throughout the entire device.
Solution Approach 2:
The light-shielding wall is formed using a light-shielding material that combines high light-absorbing properties with compatibility with the existing inorganic insulating film material system. This composite structure achieves effective light blocking while maintaining manufacturing feasibility and avoiding overly stringent depth precision requirements.
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 blocks illumination light, preventing it from reaching the switching element and reducing the risk of degradation, thus enhancing the reliability and performance of the display device.
Implementation Method 1
a first light-shielding wall disposed in a first groove formed in a first inorganic insulating film between the oxide semiconductor and the light-emitting module
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a scanning line, a first inorganic insulating film, an oxide semiconductor, and a first light-shielding wall. The first inorganic insulating film, in planer view, includes a first groove formed between the oxide semiconductor and a light-emitting module. The first light-shielding wall is disposed on the first groove.