Liquid Crystal Display Panel Non-Display Area Pretilt Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Patterned vertical alignment (PVA) TFT-LCDs face a trade-off between response time and contrast, where increasing the voltage to reduce response time decreases contrast, and achieving wide viewing angles is challenging.
Innovation Solution
A liquid crystal display panel design with a stronger alignment electric field in the non-display area, using a voltage alignment circuit to apply a larger alignment voltage to light-shielding metal electrodes than to pixel electrodes, creating a larger pretilt angle in the non-display area to enhance response speed during display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a larger alignment voltage is applied to reduce response time, then the response speed is improved, but the contrast decreases
Solution Approach 1:
The patent divides the display panel into display area and non-display area, applying different alignment voltages to each region. The non-display area receives a larger alignment voltage to create a larger pretilt angle for faster response, while the display area maintains a smaller alignment voltage to preserve contrast quality.
Solution Approach 2:
Different regions of the liquid crystal layer are given different pretilt angles through localized voltage application. The non-display area has a larger pretilt angle optimized for speed, while the display area maintains a smaller pretilt angle optimized for image quality and contrast.
2Loss of time
If a larger alignment electric field is applied to increase pretilt angle, then the response time is reduced, but the contrast ratio deteriorates
Solution Approach 1:
The alignment electric field is segmented into two zones: a strong field in the non-display area for rapid response and a weaker field in the display area for maintaining contrast ratio. This spatial segmentation allows each zone to be optimized for its specific function.
Solution Approach 2:
The non-display area is pre-aligned with a larger pretilt angle during the alignment process, preparing the liquid crystal molecules for faster response. This preliminary action in the non-display area does not affect the display area's contrast performance.
3Speed
If the pretilt angle is increased to improve response speed, then the tilt orientation is enhanced, but the viewing angle compensation is affected
Solution Approach 1:
The patent segments the pretilt angle distribution across different areas. The non-display area uses a larger pretilt angle for fast response, while the display area uses a smaller pretilt angle that works optimally with the patterned electrode structure for wide viewing angle compensation.
Solution Approach 2:
Different pretilt angles are applied locally to different regions based on their functional requirements. The display area maintains optimal viewing angle characteristics with its smaller pretilt angle, while the non-display area achieves fast response with its larger pretilt angle.
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 improves the response speed of liquid crystals in the display area while maintaining contrast by leveraging a stronger alignment electric field in the non-display area, optimizing the pretilt angles for faster tilt and better viewing angles.
Implementation Method 1
By applying a voltage, tilt orientation of liquid crystal molecules under action of an electric field is divided into multiple domains
Implementation Method 2
a voltage is applied between a pixel electrode and a common electrode, and ultraviolet light is irradiated to orient liquid crystals to solidify and generate a pretilt angle
Implementation Method 3
the alignment electric field can push the liquid crystals in the display area to tilt quickly and improve the response speed
Data Source
AI summary
A liquid crystal display panel provided by an embodiment of the application includes an array substrate comprising a display area and a non-display area; a color filter substrate comprising a common electrode, and the common electrode is opposite to the display area and the non-display area; a liquid crystal molecular layer disposed between the array substrate and the color filter substrate; and a voltage alignment circuit electrically connected to the display area and the non-display area correspondingly.