Counter Substrate Phase Compensation for LCD Light Collection
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Solution Overview
Problem
As liquid crystal display devices become higher-definition, the small pixel pitch and corresponding reduction in counter substrate thickness make it difficult to arrange phase difference compensation members between the lens layers and the liquid crystal layer, leading to challenges in compensating the phase difference of light effectively.
Innovation Solution
The arrangement of a phase difference compensation member, comprising a first and second phase difference compensation layer between the lens layers in the counter substrate, allows for effective phase difference compensation even in constrained spaces, with adjustable light-transmitting layers to optimize optical path lengths and minimize reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple lens layers are provided to improve light collecting performance, then light collection efficiency is improved, but the thickness of the counter substrate becomes insufficient to arrange the phase difference compensation member
Solution Approach 1:
The phase difference compensation member is divided into a first phase difference compensation layer and a second phase difference compensation layer, which are arranged in different regions of the counter substrate. The first layer is positioned between the lens layers, while the second layer is positioned between the liquid crystal layer and the lens layers, thereby distributing the compensation function across multiple segments to overcome the thickness limitation.
Solution Approach 2:
Instead of arranging all compensation layers in a single vertical stack, the invention utilizes both vertical and lateral positioning by placing compensation layers in different horizontal regions (between lens layers vs. between liquid crystal layer and lens layers). This dimensional distribution allows effective phase difference compensation without requiring increased substrate thickness.
2Manufacturing precision
If the pixel pitch is reduced to achieve high definition, then display resolution is improved, but the opening region size becomes smaller making light collection more difficult
Solution Approach 1:
Multiple lens layers are nested within the counter substrate structure, with each lens layer positioned to collect light into the opening region. The lens layers are arranged in a nested configuration where the optical paths are coordinated to work together, allowing effective light collection even when the opening region size is reduced due to smaller pixel pitch.
3Reliability
If the phase difference compensation member is arranged between the lens layer closer to the liquid crystal layer and the liquid crystal layer, then phase difference compensation is effective, but there is insufficient space when the counter substrate thickness is small
Solution Approach 1:
The phase difference compensation function is segmented into two separate layers positioned in different locations within the counter substrate. This segmentation allows the system to maintain effective phase difference compensation while adapting to limited substrate thickness by distributing compensation elements across available spaces rather than concentrating them in a single location.
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 enables efficient phase difference compensation and high transmittance while maintaining manufacturing ease, even in compact designs, by dividing the compensation function across multiple layers and optimizing the optical path lengths between lens layers.
Implementation Method 1
a first lens layer that collects light incident to the counter substrate
Implementation Method 2
a second lens layer that collects the light
Implementation Method 3
a first phase difference compensation layer that is arranged between the first lens layer and the second lens layer and compensates a phase difference of light generated by the liquid crystal layer
Data Source
AI summary
An aspect of a liquid crystal display device includes an element substrate, a counter substrate, and a liquid crystal layer sandwiched by the element substrate and the counter substrate. The counter substrate includes a common electrode, a first lens layer that collects light incident to the counter substrate, a second lens layer that collects the light, and a first phase difference compensation layer that is arranged between the first lens layer and the second lens layer in a thickness direction perpendicular to the common electrode and compensates a phase difference of the light generated by the liquid crystal layer.