LCD Light Blocking Pattern with Phase Matching Layer
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in preventing external light reflection, which affects image quality and contrast, due to the inefficiency of existing light blocking patterns.
Innovation Solution
A substrate with a light blocking pattern comprising a semi-transmission reflective layer, a phase matching layer, and a reflective metal layer, all with matching etching rates, is used to prevent external light reflection, combined with selective transmission layers and color filters containing quantum dot materials to enhance color reproduction and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking pattern is arranged between pixel areas to improve contrast, then contrast is improved, but external light reflection is not effectively prevented
Solution Approach 1:
The light blocking pattern is divided into multiple functional layers: a semi-transmissive reflective layer, a phase matching layer, and a reflective metal layer. Each layer performs a specific function in the light blocking process, with the semi-transmissive layer initially reflecting some light, the phase matching layer controlling light phase, and the metal layer providing strong reflection to effectively prevent external light reflection.
Solution Approach 2:
The light blocking pattern uses composite material structure combining different materials with complementary properties: the semi-transmissive reflective layer (partial reflection), the phase matching layer (phase control), and the reflective metal layer (strong reflection). This composite structure achieves superior light blocking performance compared to single-material patterns.
2Reliability
If multiple layers with different materials are used in the light blocking pattern to improve light blocking performance, then light blocking effectiveness is improved, but manufacturing complexity increases due to different etching rates
Solution Approach 1:
The patent optimizes the etching parameters and material composition to achieve substantially equal etching rates for the phase matching layer and reflective metal layer. By adjusting material composition ratios and etching conditions, the etching process can remove all layers simultaneously at the same rate, simplifying manufacturing while maintaining the multi-layer composite structure for effective light blocking.
3Object-affected harmful factors
If a reflective metal layer is added to prevent external light reflection, then light blocking effectiveness is improved, but manufacturing precision requirements increase due to etching uniformity
Solution Approach 1:
The patent carefully controls material composition ratios and etching parameters to achieve substantially equal etching rates between the phase matching layer and reflective metal layer. This parameter optimization ensures that during the etching process, both layers are removed at the same rate, preventing under-cut or over-etching issues and maintaining high manufacturing precision while achieving effective light blocking.
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 effectively reduces external light reflection, improves color reproducibility, and enhances the overall image quality of LCD devices by using a uniform etching process for the light blocking pattern and quantum dot conversion of light colors.
Implementation Method 1
at least one of the first through third color filters includes a quantum dot material and converts light of a first color that is provided by the backlight unit into light of a second color different from the first color
Implementation Method 2
The phase matching layer and the reflective metal layer have substantially the same etching rate
Data Source
AI summary
There is provided a display device. The display device includes a first substrate, a second substrate that faces the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. One of the first substrate and the second substrate includes a base substrate and a light blocking pattern disposed on a surface that faces the other surface of both surfaces of the base substrate, the light blocking pattern exposing a part of the base substrate. The light blocking pattern includes a semi-transmission reflective layer a disposed on the base substrate, a phase matching layer disposed on the semi-transmission reflective layer, and a reflective metal layer disposed on the phase matching layer. The phase matching layer and the reflective metal layer include materials having substantially the same etching rate.