Display Substrate Refractive Index Matching for Transmittance
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Solution Overview
Problem
The difference in refractive indices between the base substrate and the gate insulating layer in display apparatuses leads to light reflection at their interface, reducing transmittance and image quality.
Innovation Solution
A display substrate design where the base substrate and color filter have matching refractive indices, with a light blocking portion and passivation layer to minimize light reflection, and a pixel electrode connected through a contact hole, enhancing electrical connection and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate insulating layer with different refractive index is used between the base substrate and TFT, then electrical insulation is achieved, but light reflection increases and transmittance decreases
Solution Approach 1:
The patent introduces an intermediate layer with refractive index gradient between the base substrate and the gate insulating layer. This intermediate layer acts as a mediator that gradually transitions the refractive index from the base substrate value to the gate insulating layer value, reducing the abrupt refractive index mismatch and minimizing light reflection at the interface while maintaining electrical insulation functionality.
Solution Approach 2:
The patent changes the refractive index parameter by introducing an intermediate layer with a refractive index that is intermediate between the base substrate and the gate insulating layer. This parameter change creates a gradual transition zone that reduces light reflection without compromising the electrical insulation properties of the gate insulating layer.
2Ease of manufacture
If the color filter is placed directly on the base substrate, then manufacturing is simplified, but light reflection at the interface reduces image quality
Solution Approach 1:
The patent introduces an intermediate layer between the base substrate and the color filter to act as a mediator that reduces light reflection at their interface. This intermediate layer has a refractive index that is intermediate between the base substrate and the color filter materials, creating a gradual transition that minimizes reflection while maintaining the simplified direct-placement manufacturing approach.
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 matching refractive indices between the base substrate and color filter reduce light reflection, increasing transmittance and improving image quality, while the light blocking and passivation layers protect the TFT and color filter, respectively.
Implementation Method 1
a refractive index of the base substrate and a refractive index of the color filter may be substantially the same... a light is reflected at an interface between the base substrate and the gate insulating layer
Data Source
AI summary
A display substrate includes a base substrate, a thin-film transistor (TFT), a color filter and a pixel electrode. The TFT is on the base substrate. The color filter is on the base substrate including the TFT and in contact with the base substrate. The pixel electrode is on the color filter and in electrical connection to a drain electrode of the TFT.