Transflective LCD Inorganic Electrode Gas Barrier
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Solution Overview
Problem
Transflective liquid crystal display devices face challenges in achieving high reflectance and transmittance due to creases on the insulating resin layer in transmissive regions and potential gas generation affecting the reflective film, leading to decreased display performance.
Innovation Solution
Incorporating an inorganic transparent electrode between the insulating resin layer and the reflective film, with first projections and recesses on the resin layer and finer second projections and recesses on the film, and ensuring continuous coverage at boundaries between reflective and transmissive regions to prevent conduction failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If heating is performed to form second projections and recesses on the reflective film, then the reflectance is improved, but creases are formed on the insulating resin layer surface and gas is generated causing deterioration
Solution Approach 1:
An inorganic transparent electrode layer is introduced as an intermediary between the insulating resin layer and the reflective film. This intermediate layer acts as a barrier that prevents gas generated during heating from reaching and deteriorating the reflective film, while also providing a stable surface that resists crease formation when heated to form the second projections and recesses
Solution Approach 2:
The patent employs a composite structure combining organic insulating resin material and inorganic transparent electrode material. This composite construction leverages the insulating and structural properties of the resin layer while the inorganic electrode layer provides thermal stability and gas barrier properties during the heating process for forming surface projections
2Illumination intensity
If the insulating resin layer is made smooth in transmissive regions, then transmittance is improved, but conduction failure may occur at boundaries between reflective and transmissive regions
Solution Approach 1:
The insulating resin layer is given different surface qualities in different regions: smooth in transmissive regions for high transmittance, and with projections and recesses in reflective regions for high reflectance. The inorganic transparent electrode layer continuously covers both regions, ensuring conduction continuity at the boundaries despite the surface quality differences
3Illumination intensity
If reflective films are formed on organic insulating resin layers with projections and recesses, then reflectance is improved, but the organic film surface deteriorates due to heating and gas generation
Solution Approach 1:
The inorganic transparent electrode layer serves as a protective intermediary between the organic insulating resin layer and the reflective film. During heating to form second projections and recesses on the reflective film, this intermediate inorganic layer prevents direct thermal and chemical interaction between the heating process and the organic resin, preventing deterioration while still allowing the reflective film to achieve high reflectance
Data Source
AI summary
A liquid crystal display device including: a reflective region including an insulating resin layer, an inorganic transparent electrode, and a reflective film disposed on the inorganic transparent electrode; and a transmissive region including the insulating resin layer and the inorganic transparent electrode, wherein in the reflective region, the insulating resin layer is provided on a surface with first projections and recesses, the inorganic transparent electrode is disposed on the first projections and recesses, and the reflective film is provided on a surface with finer second projections and recesses than the first projections and recesses, in the transmissive region, the insulating resin layer is provided on the surface with a smooth portion, and the inorganic transparent electrode is disposed on the smooth portion, and the insulating resin layer and the inorganic transparent electrode are each continuously disposed at a boundary between the reflective region and the transmissive region.