Reflective LCD Pixel Segmentation for LC Alignment
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with liquid crystal misalignment and non-uniformity in the liquid crystal cell gap due to non-planar reflective electrodes, which affect display performance and legibility, especially under varying lighting conditions.
Innovation Solution
The implementation of a dielectric layer with a planar surface over a non-planar reflective layer in LCD structures, and the division of reflective and transmissive regions based on viewing angles to optimize light reflection and transmission, using materials like aluminum or silver for reflective electrodes and transparent conductors for transmissive electrodes, to improve display efficiency and legibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a non-planar reflective electrode is used to increase light reflection efficiency, then reflection efficiency is improved, but liquid crystal misalignment and cell gap non-uniformity occur
Solution Approach 1:
The pixel is divided into two distinct regions: a first region with a non-planar reflective electrode for high reflection efficiency, and a second region without the reflective electrode (transmissive region) for maintaining liquid crystal uniformity. This segmentation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the pixel are assigned different optical properties: the first region has reflective characteristics optimized for specific viewing angles, while the second region has transmissive characteristics. This local differentiation resolves the contradiction by allowing non-planar structure only where it benefits reflection without harming overall liquid crystal uniformity.
2Use of energy by moving object
If a non-planar reflective electrode is used to enhance reflection, then reflection efficiency is improved, but display legibility deteriorates due to light scattering
Solution Approach 1:
The pixel is segmented into reflective and transmissive regions, allowing the reflective portion to concentrate light in specific directions while the transmissive portion provides uniform light transmission, collectively improving both reflection efficiency and display legibility.
Solution Approach 2:
The reflective electrode is localized to specific angular regions where it provides enhanced reflection without causing excessive scattering, while other regions maintain optimal optical properties for clear display legibility.
3Use of energy by moving object
If the entire reflective surface is used for light reflection, then reflection efficiency is maximized, but transmissive performance is lost
Solution Approach 1:
The pixel structure is segmented into a first region containing the reflective electrode and a second region without it, enabling the display to simultaneously achieve reflection and transmission modes within the same pixel, thereby enhancing adaptability to different viewing conditions.
Solution Approach 2:
Each pixel becomes multi-functional by incorporating both reflective and transmissive regions, allowing the display to adapt to various lighting conditions and viewing preferences without requiring separate display types.
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 minimizes liquid crystal misalignment, ensures uniform liquid crystal layer thickness, and enhances display efficiency by utilizing only effective reflective areas while converting non-useful reflective regions into transmissive areas, improving viewing angles and overall display performance under any lighting conditions.
Implementation Method 1
the reflective electrode 22 having the undulating shape. When light is emanated from the back light system 29 behind the liquid crystal layer 14, the light passes through the liquid crystal layer 14 only once and exits out from the display surface. When a beam of light incident on the surface of the liquid crystal display from the viewer's side, the light passes through the liquid crystal layer 14 and is reflected by the reflective electrode 22
Data Source
AI summary
A liquid crystal display structure includes a first substrate panel, a second substrate panel, and a liquid crystal layer disposed between the first substrate panel and the second substrate panel. Pixel portions are formed by respective electrodes for applying a voltage to the liquid crystal layer. The pixel portions include a transparent substrate panel, an organic insulating layer, a patterned reflective layer, a dielectric layer, a transparent conductive layer and a thin film transistor. The organic insulating layer is formed over the transparent substrate panel. The patterned reflective layer is formed over the organic insulating layer exposing a portion of the organic insulating layer. The dielectric layer is formed over the patterned reflective layer. The dielectric layer has a smooth upper surface. The transparent conductive layer is over the dielectric layer. The transparent conductive layer is connected to the thin film transistor so that the thin film transistor can drive the transparent conductive electrode.