Tapered Resist Layer for LCD Light Efficiency and Reflection Control
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in increasing light use efficiency and reducing external light reflection, which affect visibility, especially in bright environments.
Innovation Solution
A liquid crystal display device structure is developed with a first substrate that includes a metal layer surrounded by a resist layer with a taper angle of 40° or more, where the resist layer is in contact with the metal layer and has a thickness that reduces external light reflection, and a method involving applying a resist material, exposing it to light, developing, and heating to form a permanent film that coincides with the metal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metal layer is used to reflect light from the backlight, then light use efficiency is improved, but external light reflection increases reducing visibility in bright environments
Solution Approach 1:
The patent applies different properties to different parts of the resist layer: the main body maintains light reflection functionality while the tapered end portion provides external light absorption. This local differentiation allows the same structure to simultaneously improve light use efficiency and reduce harmful external light reflection.
Solution Approach 2:
The resist layer is designed with an asymmetric tapered end portion rather than a symmetric or vertical configuration. This asymmetric geometry creates an optical path that traps external light through multiple reflections and absorption, effectively reducing glare while maintaining the aperture ratio.
2Object-affected harmful factors
If the resist layer thickness is increased to reduce external light reflection, then visibility in bright conditions improves, but the aperture ratio decreases
Solution Approach 1:
Instead of increasing the vertical thickness of the resist layer uniformly (one-dimensional approach), the patent utilizes the horizontal dimension by creating a tapered end portion. This dimensional transition allows the resist layer to extend further optically without blocking the aperture, effectively reducing external light reflection while maintaining aperture ratio.
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
The solution enhances light use efficiency by reflecting light from the backlight and reduces external light reflection, improving visibility in bright conditions without decreasing the aperture ratio.
Implementation Method 1
enhances light use efficiency by reflecting light from the backlight
Implementation Method 2
reduces external light reflection
Data Source
AI summary
Provided are a liquid crystal display device that can increase light use efficiency and reduce external light reflection, and a method of producing the liquid crystal display device. The liquid crystal display device sequentially includes, from a back surface side toward a viewing surface side: a first substrate; a liquid crystal layer; and a second substrate, the liquid crystal display device including sub-pixels each including an optical opening allowing light to pass through, the first substrate sequentially including, from the back surface side toward the viewing surface side: a supporting substrate; a metal layer surrounding the optical openings; and a resist layer being superimposed with the metal layer and being in contact with the metal layer, an end of the resist layer being superimposed with an end of the metal layer and having a taper angle θ of 40° or more.