Liquid Crystal Display Pre-Tilt Alignment via UV Curing
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Solution Overview
Problem
High-resolution liquid crystal displays face challenges in achieving fast response speed and wide viewing angles due to insufficient initial alignment of liquid crystal molecules, particularly when the transistor is turned off, leading to inadequate pre-tilt and voltage coupling issues.
Innovation Solution
A method involving the use of an alignment aid, such as a reactive mesogen, which is cured by heat or ultraviolet light during manufacturing to pre-tilt liquid crystal molecules in various directions, allowing them to maintain alignment without an applied electric field, enhancing response speed and reducing afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an oxide semiconductor transistor is used to achieve high mobility and fast response, then the transistor turns on/off quickly, but the pixel electrode cannot maintain voltage during transistor off time, resulting in insufficient pre-tilt voltage
Solution Approach 1:
The invention applies preliminary action by pre-aligning liquid crystal molecules during the manufacturing process using UV irradiation and alignment aids. This creates a pre-tilt state before the display operates, so that when the transistor turns off quickly, the liquid crystal molecules already have the desired orientation and do not require continuous voltage maintenance to maintain alignment.
2Speed
If liquid crystal molecules are aligned without pre-tilt, then the structure is simpler, but the response speed is slow and afterimages occur
Solution Approach 1:
The alignment aid is applied and cured during manufacturing to create pre-tilted liquid crystal molecules. This preliminary alignment action eliminates the need for complex runtime control mechanisms, achieving fast response without increasing operational device complexity.
Solution Approach 2:
An alignment aid (reactive mesogen) is introduced as an intermediary substance between the substrate and liquid crystal molecules. This alignment aid mediates the alignment process by providing a surface that induces pre-tilt in the liquid crystal molecules when cured, simplifying the overall system while achieving fast response.
3Adaptability or versatility
If multiple domains with tilted alignments are formed to achieve wide viewing angle, then viewing angle improves, but the initial alignment becomes more difficult to control
Solution Approach 1:
The invention applies local quality by creating different alignment characteristics in different regions of the liquid crystal layer. The alignment aid is applied to specific areas (such as regions corresponding to different sub-pixels) to create local pre-tilt variations, enabling multiple domains with different alignment directions for wide viewing angle while maintaining precise control over each domain's initial alignment.
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 approach improves the response speed of liquid crystal displays by ensuring liquid crystal molecules are pre-tilted in a predetermined direction during operation, even without an applied electric field, thereby reducing afterimages and maintaining alignment effectively.
Implementation Method 1
The alignment aid is cured due to heat or light such as ultraviolet rays and the like
Implementation Method 2
irradiating ultraviolet rays in the liquid crystal layer, to initially align the liquid crystal molecules
Implementation Method 3
generating an electric field on the liquid crystal layer by applying a voltage to the electric field generating electrodes, aligning the liquid crystal molecules of the liquid crystal layer through the generated electric field
Data Source
AI summary
A method for manufacturing a liquid crystal display, and the display formed thereby, the method including forming a first display panel including a thin film transistor and a pixel electrode connected to the thin film transistor, the thin film transistor including an auxiliary electrode, a semiconductor layer disposed on the auxiliary electrode, and a gate electrode disposed on the semiconductor layer, forming a second display panel including a common electrode, forming a liquid crystal layer including a plurality of liquid crystal molecules on the first display panel or the second display panel, bonding the first display panel and the second display panel, applying different voltages to the pixel electrode and the common electrode, and irradiating ultraviolet rays in the liquid crystal layer, to initially align the liquid crystal molecules.