Curved LCD Misalignment Compensation via Domain Photo-Alignment
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Solution Overview
Problem
Conventional curved LCD devices face misalignment issues due to their curved profile, leading to reduced transmittance and potential texture defects, as the pretilt and alignment directions of liquid crystal molecules differ between substrates, affecting viewing angle and display quality.
Innovation Solution
A curved display device with a first substrate having a pixel electrode and a first alignment layer with multiple domains of different photo-alignment directions, and a second substrate with a vertical alignment layer, where the pretilt angles of the first and second alignment layers are controlled to compensate for misalignment, ensuring optimal liquid crystal molecule alignment and increased viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a curved profile is applied to the display device, then stereoscopic and immersion effects are improved, but misalignment between substrates occurs leading to reduced transmittance and texture defects
Solution Approach 1:
The first alignment layer is divided into multiple domains (first, second, third, and fourth domains) with different photo-alignment directions. Each domain is locally optimized with specific alignment directions (e.g., first and third domains aligned in a first direction, second and fourth domains aligned in a second direction) to compensate for the curvature-induced misalignment between substrates, thereby maintaining uniform liquid crystal alignment and preventing texture defects across the curved display surface
Solution Approach 2:
The alignment layers are pre-configured with specific photo-alignment directions before the liquid crystal molecules are introduced. The first alignment layer domains are preliminarily aligned in different directions to anticipate and compensate for the misalignment that will occur due to the curved profile, ensuring that the liquid crystal molecules achieve proper alignment even when the substrates are misaligned in the curved state
2Ease of manufacture
If conventional alignment layers are used in curved displays, then manufacturing is simplified, but viewing angle and display quality deteriorate due to misalignment
Solution Approach 1:
Instead of using a uniform alignment layer, the first alignment layer is created with spatially varying photo-alignment directions divided into multiple domains. This local differentiation allows each domain to compensate for local misalignment effects caused by curvature, maintaining high viewing angle and display quality while still using standard alignment layer materials and processes
Solution Approach 2:
The photo-alignment directions of the first alignment layer domains are changed to different orientations (first direction for first and third domains, second direction for second and fourth domains). This parameter change in alignment direction compensates for the curvature-induced misalignment, improving viewing angle and display quality without fundamentally changing the manufacturing process
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 enhances viewing angles and prevents texture defects by aligning liquid crystal molecules effectively across the curved display, maintaining high transmittance and display quality despite curvature, and allows for various photo-alignment directions in domains.
Implementation Method 1
the first alignment layer including at least two domains having different photo-alignment directions
Implementation Method 2
a second alignment layer disposed on the common electrode, the second alignment layer having a vertical alignment direction
Implementation Method 3
when an electric field is applied to the liquid crystal layer, liquid crystal molecules in the liquid crystal molecules are aligned normal to the substrates
Implementation Method 4
The liquid crystal layer may be controlled to adjust optical transmittance of each pixel to thereby display a desired image
Data Source
AI summary
A curved display device including a plurality of pixels that may be bent in a first direction crossing a second direction. The curved display device may include first and second substrates facing each other, and a liquid crystal layer interposed between the first and second substrates.