Transflective TFT LCD Ring-Shaped Reflective Electrode
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Solution Overview
Problem
Transflective LCD devices face reliability issues due to peeling of the transparent electrode near the edge of the transmissive region, caused by stress concentration and poor adhesion strength, leading to reduced pixel reliability, especially during the formation of the reflective electrode.
Innovation Solution
A pixel structure with a reflective electrode that includes an opening corresponding to the transmissive region to expose the underlying transparent electrode, mitigating stress concentration and preventing peeling by forming a ring-shaped reflective electrode that covers the edges of the transmissive region, thereby enhancing adhesion and isolating chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflective electrode is formed by depositing material over the transparent electrode, then the reflective region is created, but the transparent electrode peels off at the edges due to stress concentration and poor adhesion
Solution Approach 1:
A ring-shaped intermediate layer is introduced between the transparent electrode and the reflective electrode at the edges of the transparent electrode. This intermediate layer acts as a mediator to relieve stress concentration and improve adhesion strength, preventing peeling of the transparent electrode during the formation of the reflective electrode.
Solution Approach 2:
The intermediate layer is applied locally only at the edges of the transparent electrode where peeling occurs, rather than across the entire surface. This localized approach addresses the specific problem of edge peeling while maintaining the overall structure and functionality of the electrode assembly.
2Ease of manufacture
If the transparent electrode is deposited first, then the reflective electrode can be formed on top, but the transparent electrode has worse adhesion strength at the edges due to step height from scan line and data line
Solution Approach 1:
The intermediate layer is deposited beforehand before forming the reflective electrode, specifically at the edges of the transparent electrode. This preliminary action prepares the surface to prevent peeling during the subsequent reflective electrode formation process, addressing the adhesion issue before it occurs.
3Manufacturing precision
If photoresist, reflective layer and transparent electrode are deposited, then the reflective electrode is formed, but they peel off the protective layer in the transmissive region
Solution Approach 1:
The ring-shaped intermediate layer serves as a protective intermediary that prevents the transparent electrode, photoresist, and reflective layer from peeling off the protective layer in the transmissive region. This intermediate structure maintains manufacturing precision while ensuring reliability by preventing peeling during the fabrication process.
Data Source
AI summary
A system for displaying images. The system comprises a transflective liquid crystal display (LCD) panel comprising lower and upper substrates opposing each other and a liquid crystal layer disposed therebetween. The lower substrate comprises reflective and transmissive regions. A stack of a protective layer, a transparent electrode and a reflective electrode is disposed on the lower substrate of the reflective and transmissive regions. The reflective electrode comprises an opening corresponding to the transmissive region to substantially expose the underlying transparent electrode. A transparent dielectric layer is disposed on the surface of the upper substrate facing and corresponding to the lower substrate of the reflective region.