Inkjet Printed Reflecting Electrode for Transflective LCD
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Solution Overview
Problem
The manufacturing process of transflective LCDs is complicated due to the embossing process required for increasing reflection efficiency of reflecting electrodes, which hinders simplification without reducing reflectivity.
Innovation Solution
A thin film transistor array panel is developed with a reflecting electrode formed in a concave shape using the Inkjet printing method, and a barrier rib made of transparent organic material, allowing for improved reflection efficiency without complicating the process, and a manufacturing method that includes forming a gate line, data line, thin film transistor, and electrodes using Inkjet printing to simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an embossing process is used to increase reflection efficiency of the reflecting electrode, then reflection efficiency is improved, but the manufacturing process becomes complicated
Solution Approach 1:
Instead of embossing the substrate to create protrusions and depressions, the patent inverts the approach by forming a flat reflecting electrode on an embossed lower layer. The embossing is transferred to the lower layer structure rather than the substrate, simplifying the overall manufacturing process while achieving the same light reflection enhancement.
Solution Approach 2:
The embossed lower layer creates a structured surface with protrusions and depressions that function similarly to porous structures in enhancing light interaction. This structured surface increases the effective reflection area and improves reflection efficiency without requiring complex substrate modification.
2Adaptability or versatility
If a transflective LCD structure is implemented to enable both reflection and transmission modes, then adaptability to different environments is improved, but the manufacturing process complexity increases
Solution Approach 1:
The lower layer serves multiple functions: it acts as a structural support layer, provides the embossed surface for light reflection enhancement, and functions as part of the reflection system. This multi-functionality reduces the need for additional separate components, simplifying the overall structure despite the transflective capability.
Solution Approach 2:
The embossed lower layer creates curved surfaces (protrusions and depressions) that enhance light reflection through geometric effects. These curved structures improve reflection efficiency by directing light at various angles, enabling effective reflection mode operation while maintaining a relatively simple flat electrode structure for transmission mode.
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 solution simplifies the manufacturing process while maintaining reflection efficiency, enabling easier production of transflective LCDs with enhanced reflection characteristics.
Implementation Method 1
The reflecting electrode may be formed by an Inkjet printing method
Implementation Method 2
To increase reflection efficiency of the reflecting electrode, a lower layer is formed in an embossed shape and the reflecting electrode is formed thereon so that the reflecting electrode has protrusions and depressions
Data Source
AI summary
A thin film transistor substrate according to one or more embodiments of the present invention includes a gate line formed on a substrate, a data line that is insulated from and intersects the gate line, a thin film transistor connected to the gate line and the data line, a barrier rub formed on the thin film transistor and partitioning a plurality of first openings, a reflecting electrode formed in each of the first openings, and a pixel electrode formed on the reflecting electrode and that is electrically connected to the thin film transistor.