LCD Substrate Pre-Tilt Angle Optimization
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels suffer from limited viewing angles and image quality issues due to the anisotropy of liquid crystal molecules, leading to narrower viewing angles and potential yellowish image display when pressed, as well as slow response times.
Innovation Solution
A substrate for LCD panels is designed with a transparent electrode layer and an alignment layer having a pre-tilt angle of 85° to 90°, which is electrically floated and integrated into the manufacturing process, along with a liquid crystal layer that includes reactive mesogens to improve alignment and response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal molecules are used with anisotropy for image display, then light transmittance can be changed to display images, but viewing angle becomes narrow and image quality deteriorates when pressed
Solution Approach 1:
The patent changes the pre-tilt angle parameter of the alignment layer to a specific range (85° to 90°) to optimize liquid crystal molecule orientation. This parameter adjustment improves viewing angle and prevents yellowish image display when pressed, while maintaining light transmittance control for image display
Solution Approach 2:
The patent applies different properties to different parts of the system by using a specifically designed alignment layer with controlled pre-tilt angle in certain regions. This local optimization of molecular orientation prevents texture formation and yellowish display in pressed areas while maintaining overall image quality
2Ease of manufacture
If conventional alignment layers are used, then manufacturing is simple, but response time is slow and image quality is poor under pressure
Solution Approach 1:
The patent optimizes the pre-tilt angle parameter within 85° to 90° to achieve faster liquid crystal response time. This parameter change accelerates molecular reorientation speed, reducing response time while maintaining ease of manufacturing through conventional alignment layer formation processes
Solution Approach 2:
The alignment layer is pre-configured with a specific pre-tilt angle during manufacturing to prepare liquid crystal molecules for optimal response. This preliminary orientation setup enables faster response time when voltage is applied, without complicating the manufacturing process
3Shape
If liquid crystal molecules lie down under pressure, then texture portion forms, but refractive index anisotropy increases causing yellowish image display
Solution Approach 1:
The alignment layer with pre-tilt angle of 85° to 90° creates a preliminary orientation that resists pressure-induced texture formation. This pre-configured orientation prevents liquid crystal molecules from lying down under pressure, thereby preventing refractive index anisotropy increase and yellowish image display
Solution Approach 2:
By changing the pre-tilt angle parameter to 85° to 90°, the patent modifies the energy state of liquid crystal molecules to resist pressure-induced reorientation. This parameter change prevents texture formation and maintains uniform refractive index under pressure, eliminating yellowish image display
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 configuration enhances image display quality by preventing spot formation and improving response time, ensuring that the liquid crystals return to their original position after pressure is lifted, thus maintaining image clarity and reducing yellowish tint issues.
Implementation Method 1
The alignment layer having a pre-tilt angle tilted about 85° to about 90° is disposed on the insulating substrate on which the transparent electrode layer is formed
Implementation Method 2
The liquid crystal molecules of the liquid crystal layer vary an arrangement thereof in response to a voltage difference between a common electrode of the upper substrate and a pixel electrode of the lower substrate, and thus the light transmittance thereof may be changed to display an image
Implementation Method 3
liquid crystal molecules having positive dielectric anisotropy
Implementation Method 4
A liquid crystal layer including a reactive mesogen is formed between the first substrate and the second substrate
Data Source
AI summary
A substrate for a display panel includes a transparent electrode layer and an alignment layer. The transparent electrode layer is disposed on an insulating substrate, the transparent electrode layer being electrically floated. The alignment layer is disposed on the insulating substrate on which the transparent electrode layer is formed, and the alignment layer having a pre-tilt angle tilted about 85° to about 90° form the insulating substrate.