VA LCD Orientation Control Projection Light Shielding
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Solution Overview
Problem
VA-type liquid crystal display devices face issues with light leakage during black display due to inclined liquid crystal molecules, leading to reduced contrast and brightness, as existing light shielding patterns require increased complexity and coverage, which lowers the transmissive numerical aperture.
Innovation Solution
The implementation of orientation control projections and light shielding layers on one substrate, where the light shielding layer's outer periphery is strategically positioned relative to the orientation control projection, minimizing positional displacement and optimizing the size to prevent light leakage while maintaining high transmissive numerical aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light shielding pattern is increased to reduce light leakage, then black display quality is improved, but transmissive numerical aperture is lowered thus reducing brightness
Solution Approach 1:
The light shielding layer is selectively positioned only at the outer periphery of the orientation control projection where liquid crystal orientation deviation occurs, rather than covering the entire projection area. This localized shielding approach blocks light leakage at critical boundaries while preserving light transmission in the central display region, thus maintaining high transmissive numerical aperture and brightness.
Solution Approach 2:
The light shielding structure is divided into discrete segments corresponding to the outer periphery regions of multiple orientation control projections. By segmenting the shielding function to specific locations rather than using a continuous large-area shield, the patent achieves effective light leakage control at projection boundaries while minimizing impact on overall light transmission and maintaining high numerical aperture.
2Object-affected harmful factors
If light shielding pattern is increased to reduce light leakage, then black contrast is improved, but device complexity is increased
Solution Approach 1:
The light shielding layer is integrated with the orientation control projection structure by positioning it at the projection's outer periphery. This merging of shielding function with the existing projection geometry eliminates the need for separate complex shielding patterns, achieving effective light leakage control while maintaining relatively simple device structure and 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
This configuration effectively reduces light leakage during black display and maintains high brightness by ensuring the light shielding layer is as small as possible, thereby enhancing the transmissive contrast without compromising the transmissive numerical aperture.
Implementation Method 1
The orientation control projection is a projection for controlling a direction that the liquid crystal molecules in the liquid crystal material are tilted
Implementation Method 2
a light shielding layer which is formed by patterning the conductive film using the orientation control projection as a mask
Data Source
AI summary
The present invention lowers leaking of light at the time of performing a black display of VA-type liquid crystal display device and, at the same time, prevents lowering of a numerical aperture. In a liquid crystal display device having a liquid crystal display panel which sandwiches a liquid crystal material between a first substrate having a pixel electrode and a second substrate having a counter electrode, the second substrate includes an orientation control projection which is formed by forming a conductive film on the second substrate, by forming an insulation film on the conductive film and, thereafter, by patterning the insulation film, and a light shielding layer which is formed by patterning the conductive film using the orientation control projection as a mask.