Reflective Pixel Electrode Bump Coverage for Transflective LCD
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Solution Overview
Problem
Conventional transflective LCD (TR-LCD) manufacturing processes are complex and costly due to the need for padding layers and photoresist bumps under reflective pixel electrodes, complicating the fabrication of pixel structures while aiming for high reflectivity and quality.
Innovation Solution
A pixel structure with a single cell gap is developed, featuring a reflective pixel electrode covering bumps to enhance reflectivity, and an overcoat dielectric layer that adjusts the electrical field, allowing for identical display performance in both transmissive and reflective modes, fabricated through a simplified process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a padding layer and photoresist bumps are inserted under the reflective pixel electrode to improve reflectivity and display quality, then the reflectivity and display quality are improved, but the manufacturing process becomes more complicated and costs increase
Solution Approach 1:
The invention extracts and eliminates the unnecessary padding layer from the pixel structure. By removing this extra layer, the manufacturing process is simplified while maintaining the reflective properties through the optimized reflective pixel electrode design that directly contacts the ITO layer without requiring additional padding structures.
Solution Approach 2:
The reflective pixel electrode is designed to serve multiple functions simultaneously: it provides the reflective surface for external light, maintains proper electrical connection to the ITO layer, and defines the pixel boundary. This multi-functionality eliminates the need for separate padding layers and photoresist bumps, reducing manufacturing complexity while preserving display quality.
2Manufacturing precision
If a padding layer and photoresist bumps are inserted under the reflective pixel electrode to improve reflectivity, then the reflectivity is improved, but the manufacturing cost increases
Solution Approach 1:
The invention removes the costly padding layer and photoresist bump structures, reducing material costs and manufacturing steps. The reflectivity is maintained through the optimized reflective pixel electrode design that directly interfaces with the ITO layer, eliminating the need for expensive additional layers.
Solution Approach 2:
The invention uses a simple, cost-effective reflective pixel electrode structure that achieves the required reflectivity without expensive materials or complex multi-layer constructions. The design relies on the inherent reflective properties of the metal layer in conjunction with the ITO layer, avoiding the need for costly padding and photoresist materials.
3Manufacturing precision
If a dual cell gap structure is constructed with a padding layer to ensure balanced display effect in reflective and transmissive areas, then the display performance is balanced, but the manufacturing process becomes more complex
Solution Approach 1:
The invention extracts and removes the padding layer that created the dual cell gap structure. By eliminating this layer, the pixel structure achieves a uniform single cell gap throughout, simplifying the manufacturing process while maintaining balanced display performance through the optimized reflective pixel electrode design.
Solution Approach 2:
Instead of using a dual cell gap structure with padding layers to balance display performance, the invention inverts the approach by using a uniform single cell gap structure with an optimized reflective pixel electrode. The balancing of reflective and transmissive display effects is achieved through electrode design rather than structural 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 solution simplifies the manufacturing process, reduces costs, and maintains high reflectivity and quality, preventing light leakage and ensuring balanced display performance between transmissive and reflective modes.
Implementation Method 1
a reflective pixel electrode suitable for reflecting external light, such that a reflective area is formed
Implementation Method 2
an overcoat dielectric layer that adjusts the electrical field
Data Source
AI summary
A pixel structure including a gate, a gate dielectric layer, a patterned semiconductor layer having a channel area disposed above the gate, a patterned dielectric layer having an etching-stop layer disposed above the gate and a number of bumps, a patterned metal layer having a reflective pixel electrode, a source and a drain, an overcoat dielectric layer, and a transparent pixel electrode sequentially disposed on a substrate is provided. The source and the drain respectively cover portions of the channel area. The reflective pixel electrode connects the drain and covers the bumps to form an uneven surface. The overcoat dielectric layer disposed on a transistor constituted by the gate, the gate dielectric layer, the patterned semiconductor layer, the source and the drain has a contact opening exposing a portion of the reflective pixel electrode. The transparent pixel electrode is electrically connected to the reflective pixel electrode through the contact opening.