Electro-Optical Pixel Structure for Stray Light Reduction
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Solution Overview
Problem
Existing electro-optical devices suffer from stray light generation due to differences in the thickness of optical adjustment layers causing variations in the aspect ratio of contact plugs for different color sub-pixels, leading to display quality degradation.
Innovation Solution
The device employs a semi-transmissive first electrode, a transmissive second electrode, and a transmissive third electrode, with reflection layers and optical adjustment layers to maintain consistent distances between electrodes and conductive portions, reducing the height differences of contact plugs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the optical adjustment layer is varied for different color sub-pixels to adjust optical path length, then the optical resonance performance is improved, but the aspect ratio of contact plugs varies causing step generation and stray light
Solution Approach 1:
The patent divides the contact structure into multiple segments: a contact plug extending from the substrate to the first electrode, and a separate conductive layer formed on the contact plug to connect to the optical adjustment layer. This segmentation allows the contact plug to maintain a uniform height determined by substrate to first electrode distance, while the conductive layer adapts to different optical adjustment layer thicknesses, thus resolving the contradiction between optical path adjustment and contact uniformity
Solution Approach 2:
The patent introduces a conductive layer as an intermediary element between the contact plug and the optical adjustment layer. This conductive layer serves as a mediator that accommodates the varying thickness of optical adjustment layers without affecting the uniform height of contact plugs, thereby eliminating steps and stray light while maintaining optical performance
2Ease of manufacture
If different thicknesses of optical adjustment layer are used for different colors, then wavelength-specific resonance is achieved, but stray light is generated due to contact height differences
Solution Approach 1:
The contact structure is segmented into a uniform-height contact plug and an adaptive conductive layer, allowing the optical adjustment layer to have different thicknesses for wavelength selection without creating steps that generate stray light
Solution Approach 2:
The conductive layer acts as an intermediary that absorbs the thickness variation of optical adjustment layers, preventing step formation and stray light generation while maintaining the wavelength-specific resonance capability
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
This configuration minimizes steps between contact plugs, reducing stray light and enhancing display quality by ensuring uniformity in the electro-optical device's pixel structure.
Implementation Method 1
a first electrode having a semi-transmissive property, a second electrode having a light transmissive property, being provided between the first electrode and the substrate, and facing the first electrode, a third electrode having a light transmissive property
Implementation Method 2
a first reflection layer being provided between the substrate and the second electrode and facing the second electrode, a second reflection layer being provided between the substrate and the third electrode and facing the third electrode
Data Source
AI summary
An electro-optical device includes a substrate, a first electrode, a second electrode, a third electrode, a first reflection layer, a second reflection layer, a light emission function layer, a first optical adjustment layer, a second optical adjustment layer, a first driving circuit, a second driving circuit, a first conductive portion being in contact with the second electrode at a first position in a normal line direction of the substrate and being configured to electrically couple the second electrode and the first reflection layer, and a second conductive portion being in contact with the third electrode at a second position in the normal line direction and being configured to electrically couple the third electrode and the second reflection layer.