Liquid Crystal Display Spacer Light Shielding
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Solution Overview
Problem
In liquid crystal display apparatuses using the FFS mode, the photo spacer at the intersecting portion of source and gate wiring causes light leakage due to the 'rubbing shadow' effect, degrading image quality, and moving the spacer increases pixel width, making it difficult to satisfy pixel layout restrictions.
Innovation Solution
A light shielding portion is provided to shield the spacer portion from light, and the source wiring is bent in different directions within the region of the light shielding portion, reducing light leakage while maintaining the required pixel layout constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the photo spacer is positioned at the intersecting portion of source and gate wiring to maintain liquid crystal layer thickness, then the liquid crystal layer thickness is properly maintained, but light leakage occurs due to the rubbing shadow effect degrading image quality
Solution Approach 1:
A light shielding portion is introduced as an intermediary element between the photo spacer and the liquid crystal layer. This light shielding portion blocks light from reaching the photo spacer, preventing the rubbing shadow effect while allowing the photo spacer to maintain its function of ensuring uniform liquid crystal layer thickness. The light shielding portion acts as a mediator that eliminates the harmful optical effect without compromising the structural function.
Solution Approach 2:
The solution segments the functional elements by separating the light shielding function from the spacer function. The light shielding portion is positioned between the color filter substrate and the photo spacer, dividing the structure into distinct functional zones: the light shielding portion handles optical blocking, while the photo spacer handles mechanical spacing and thickness control. This segmentation allows each element to perform its specific function without interfering negatively with the other.
2Object-affected harmful factors
If the photo spacer is moved to a position not overlapped with TFT to reduce light leakage, then light leakage is reduced, but the pixel width increases making it difficult to satisfy pixel layout restrictions
Solution Approach 1:
The light shielding portion serves as an intermediary that allows the photo spacer to remain in its optimal position at the wire crossing without causing light leakage. By blocking light before it reaches the photo spacer, the light shielding portion enables the photo spacer to maintain its position for proper thickness control while eliminating the rubbing shadow effect, thus avoiding the need to move the spacer and increase pixel width.
Solution Approach 2:
The solution addresses the problem by adding a new dimensional element - the light shielding portion positioned in the optical path between the color filter substrate and the photo spacer. This creates a new spatial layer that blocks light without requiring horizontal displacement of the photo spacer, thereby maintaining pixel layout constraints while preventing light leakage.
3Object-affected harmful factors
If the source wiring is bent in different directions within the light shielding portion region to reduce light leakage, then light leakage is reduced, but the wiring complexity increases
Solution Approach 1:
The light shielding portion acts as an intermediary solution that reduces light leakage without requiring complex wiring modifications. By blocking light at the source before it interacts with the photo spacer, the light shielding portion eliminates the need to bend source wiring in multiple directions, thereby reducing light leakage while maintaining simple wiring configuration.
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 effectively reduces light leakage and improves the performance of the liquid crystal display apparatus by ensuring proper alignment of the liquid crystal layer, maintaining image quality, and adhering to pixel layout restrictions.
Implementation Method 1
a light shielding portion for spacer portion, which shields the spacer portion from light, is provided
Implementation Method 2
A liquid crystal display apparatus displays an image by changing an orientation of liquid crystal molecules aligned in a predetermined direction by an electric field and controlling the amount of light transmission through a liquid crystal layer
Data Source
AI summary
A spacer portion for keeping a thickness of a liquid crystal layer is provided at an intersecting portion between a gate wiring and a source wiring when seen in a plan view, and a light shielding portion for spacer portion which shields the spacer portion from light is provided. The spacer portion is disposed in a region in which the light shielding portion for spacer portion is provided when seen in a plan view. Then, the source wiring has two bend portions which are bent in mutually different directions in the region in which the light shielding portion for spacer portion is provided when seen in a plan view.