Multi-curved LCD Panel Annealing Yield via Polarizer Axis Segmentation
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Solution Overview
Problem
Existing methods for manufacturing multi-curved liquid crystal display panels face challenges in achieving high yield due to difficulties in forming multiple curved surfaces using annealing, as they often result in either a cup or cap shape rather than a wavy shape, leading to reduced production efficiency.
Innovation Solution
A multi-curved liquid crystal display panel design featuring alternating cup-shaped and cap-shaped regions with polarizing plates having absorption axes oriented differently in each region, allowing for controlled contraction during annealing to form desired curved surfaces, thereby facilitating the production of panels with multiple curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If annealing is used to form curved surfaces on display panels, then moisture is evaporated from polarizing plates causing contraction and curvature formation, but only one curved surface can be formed at a time reducing productivity
Solution Approach 1:
The polarizing plate is divided into multiple regions with different absorption axis orientations. The first region has an absorption axis oriented in a first direction while the second region has an absorption axis oriented in a second direction different from the first direction. This segmentation allows different portions of the polarizing plate to contract in different directions during annealing, enabling formation of multiple curved surfaces simultaneously.
Solution Approach 2:
Different regions of the polarizing plate are given different local properties by orienting the absorption axis in different directions. The first region is designed with absorption axis in a first direction to form one type of curvature, while the second region has absorption axis in a second direction to form a different type of curvature. This local differentiation enables multi-curved surface formation from a single annealing process.
2Shape
If a flat display panel is forcibly curved using a curved surface machining apparatus, then a curved surface is formed, but the alignment axis of liquid crystals at the edge becomes twisted causing light leakage
Solution Approach 1:
The curvature is formed during the annealing process itself, before the liquid crystal alignment is finalized. By forming the curved shape through polarizing plate contraction during annealing, the liquid crystal alignment naturally follows the curved surface without twisting, preventing light leakage at the edges.
3Adaptability or versatility
If multiple curved surfaces are formed on a display panel, then design versatility is improved, but manufacturing complexity increases
Solution Approach 1:
The polarizing plate is segmented into multiple regions with different absorption axis orientations. This segmentation allows control over the curvature formation in different regions, enabling versatile multi-curved surface designs while maintaining a relatively simple single-layer polarizing plate structure without requiring multiple separate components.
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
This design enhances the yield of multi-curved liquid crystal display panels by enabling the formation of wavy cross-sectional shapes with improved curvature control, allowing for the simultaneous creation of multiple curved surfaces without compromising the shape integrity.
Implementation Method 1
When a display panel is placed on a jig having a curved surface shape and annealing is carried out, moisture is evaporated from polarizing plates, thereby causing the polarizing plates to contract.
Implementation Method 2
moisture is evaporated from polarizing plates, thereby causing the polarizing plates to contract
Data Source
AI summary
A multi-curved liquid crystal display panel includes lower and upper substrates provided with first and second regions and bonded to each other, first and second upper polarizing plates on an upper surface of the upper substrate in the first and second regions, and first and second lower polarizing plates on a lower surface of the lower substrate in the first and second regions. The orientations of absorption axes of the first upper polarizing plate and the second upper polarizing plate are different, the orientations of absorption axes of the first lower polarizing plate and the second lower polarizing plate are different, the orientations of the absorption axes of the first upper polarizing plate and the second lower polarizing plate are equal, and the orientations of the absorption axes of the first lower polarizing plate and the second upper polarizing plate are equal.