Insertion Layer Refractive Index Gradient for Display Transmittance
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Solution Overview
Problem
Conventional display devices face a challenge of low transmittance under a constant aperture ratio, which affects the brightness of liquid crystal display (LCD) screens, as increasing resolution leads to decreased transmittance.
Innovation Solution
A substrate configuration is introduced, featuring a glass substrate with a gate insulation layer, a functional layer, an alignment layer, and an insertion layer with specific refractive indices, where the refractive index of the insertion layer is between the functional and alignment layers, reducing the difference in refractive indices between adjacent layers and minimizing reflectance, thereby increasing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution is increased, then the display quality is improved, but the transmittance decreases
Solution Approach 1:
The patent changes the refractive index parameter of the insertion layer to reduce optical reflection. By selecting a material with refractive index n4 where n3>n4>n5, the optical impedance mismatch between layers is reduced, allowing more light to transmit through the substrate while maintaining the high resolution structure.
Solution Approach 2:
The insertion layer acts as an optical intermediary between the functional layer and alignment layer. This intermediate layer with refractive index n4 serves as a transition medium that gradually changes the refractive index from n3 to n5, reducing the reflection at the interface and improving overall light transmittance.
2Manufacturing precision
If the aperture ratio is kept constant, then the pixel density is maintained, but the transmittance decreases
Solution Approach 1:
The patent modifies the optical parameter (refractive index) of the insertion layer to reduce reflection losses. This allows the aperture ratio to remain constant while improving transmittance by reducing the reflection coefficient at the film layer interfaces through proper selection of n4 between n3 and n5.
3Reliability
If multiple film layers are stacked, then the functional performance is improved, but the reflectance increases
Solution Approach 1:
The insertion layer serves as an intermediary between the functional layer and alignment layer, reducing the abrupt refractive index change at their interface. This intermediary layer with refractive index n4 minimizes the reflection coefficient while allowing both functional layers to maintain their performance characteristics.
Solution Approach 2:
The patent optimizes the refractive index parameter of the insertion layer to reduce optical reflection. By setting n4 between n3 and n5, the optical impedance mismatch is reduced, decreasing reflectance while preserving the functional performance of the stacked film layers.
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 substrate design effectively decreases reflectance and increases transmittance by reducing the refractive index difference between film layers, allowing more light to pass through and enhancing display device brightness.
Implementation Method 1
a refractive index of the functional layer is n3, a refractive index of the alignment layer is n5, a refractive index of the insertion layer is n4, and n3>n4>n5
Implementation Method 2
decreasing entire reflectance of the substrate, so that more light is not reflected but passes through the substrate to increase the transmittance
Data Source
AI summary
A substrate and a display device are disclosed. The substrate includes a glass substrate; a gate insulation layer disposed on a surface of the glass substrate; a functional layer disposed on a surface of the gate insulation layer; an alignment layer disposed on a side of the functional layer; and an insertion layer disposed between the functional layer and the alignment layer; wherein a refractive index of the functional layer is n3, a refractive index of the alignment layer is n5, a refractive index of the insertion layer is n4, and n3>n4>n5.