Pixel Structure With Patterned Dielectric Micro-Bumps
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Solution Overview
Problem
Transflective LCDs with dual cell gaps face complexity in fabrication and unsatisfactory light transmittance, leading to reduced aperture ratio and inadequate reflectivity, especially in strong light environments.
Innovation Solution
A pixel structure with a reflective area featuring a semiconductor lower electrode, upper electrode, patterned dielectric layer with micro-bumps, and a reflective electrode, which is electrically connected to the upper electrode and active device, forming a storage capacitor, enhancing light reflectivity without the need for additional diffusion adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual cell gap structure is used in transflective LCDs to achieve different cell gaps at transmissive and reflective areas, then the display performance is improved, but the fabrication complexity increases and light transmittance becomes unsatisfactory
Solution Approach 1:
The reflective electrode is divided into multiple segments corresponding to different sub-pixels (red, green, blue), with each segment having optimized reflectivity characteristics. This segmentation allows independent optimization of reflectivity for each color channel while maintaining a single cell gap structure, avoiding the complexity of dual cell gaps.
Solution Approach 2:
Different regions of the reflective electrode are designed with different reflectivity characteristics to match the specific requirements of each sub-pixel. The patterned dielectric layer creates local variations in the reflective properties, allowing each area to be optimized for its function while using a unified cell gap.
2Illumination intensity
If a flat reflective layer is added to increase light reflectivity in micro-reflective LCDs, then reflectivity improves, but the overall aperture ratio decreases due to reduced light transmittance
Solution Approach 1:
The patterned dielectric layer introduces micro-bumps that create curved surfaces on the reflective electrode. These curved surfaces enhance light scattering and reflectivity in multiple directions, improving the overall reflectivity performance without requiring a larger reflective area, thus preserving the aperture ratio.
Solution Approach 2:
Instead of increasing reflectivity by expanding the reflective area in the planar dimension, the invention uses the vertical dimension by adding a patterned dielectric layer with micro-bumps. This creates three-dimensional light interaction that enhances reflectivity without occupying additional lateral space, maintaining the aperture ratio.
3Reliability
If diffusion adhesive is added to the upper polarizer to increase light reflectivity in strong light environments, then display clarity improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patterned dielectric layer with micro-bumps provides self-service by inherently enhancing light reflectivity through its three-dimensional structure. This eliminates the need for additional diffusion adhesive layers, as the micro-bump structure itself performs the function of improving display clarity in various lighting conditions without adding manufacturing complexity.
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 pixel structure significantly improves light reflectivity and display clarity in various lighting conditions while reducing manufacturing costs and complexity, allowing for clearer information observation without additional adhesives.
Implementation Method 1
a patterned dielectric layer having a plurality of micro-bumps is disposed on the upper electrode and exposes a part of the upper electrode. The reflective electrode is disposed on the patterned dielectric layer and the part of the upper electrode
Data Source
AI summary
A pixel structure disposed on a substrate and electrically connected to a scan line and a data line is provided. The pixel structure has a reflective area and includes a common line, a semiconductor lower electrode, an upper electrode, a patterned dielectric layer, a reflective electrode and an active device. The semiconductor lower electrode electrically connected to the common line is disposed on the substrate within the reflective area. The upper electrode is disposed above and electrically isolated from the semiconductor lower electrode. The patterned dielectric layer with the micro-bumps is disposed on the upper electrode and exposes a part of the upper electrode. The reflective electrode is disposed on the patterned dielectric layer and the part of the upper electrode. Besides, the reflective electrode is electrically connected to the upper electrode. The active device is electrically connected to the scan line, the data line and the reflective electrode.