Transflective LCD Single Cell Gap Uniform Light Efficiency
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Solution Overview
Problem
Transflective type LCD devices with liquid crystal capsules face complications in fabrication and reduced yield due to different cell gaps in transmissive and reflective areas, leading to increased power consumption, reduced transmittance, and complexity in pixel structure, which affects viewing angle and resolution.
Innovation Solution
A transflective liquid crystal display device with a single cell gap liquid crystal layer and distinct separation distances between pixel and common electrodes in transmissive and reflective areas, allowing for uniform light efficiency and reduced power consumption by optimizing electric field intensity and retardation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different cell gaps are defined for transmissive and reflective areas, then uniform light efficiency is achieved between the two areas, but fabrication process becomes complicated and yield is reduced
Solution Approach 1:
The patent applies local quality by defining different cell gaps in specific regions: a first cell gap in the transmissive area and a second cell gap in the reflective area. This allows each region to have optimized optical properties for its specific function while maintaining overall device uniformity through a single liquid crystal layer.
Solution Approach 2:
The liquid crystal layer is segmented into different thickness regions corresponding to transmissive and reflective areas. By dividing the cell gap into different values in different areas, the patent achieves uniform light efficiency across both areas without requiring separate liquid crystal layers or complex additional structures.
2Illumination intensity
If different cell gaps are defined for transmissive and reflective areas, then uniform light efficiency is achieved, but device complexity increases
Solution Approach 1:
The patent merges the transmissive and reflective liquid crystal layers into a single liquid crystal layer with spatially varying cell gap. This integration eliminates the need for separate layers and their associated alignment structures, reducing device complexity while achieving the optical performance of having different cell gaps.
Solution Approach 2:
The single liquid crystal layer serves multiple functions: it provides both transmissive and reflective modes with optimized performance for each mode through different local cell gaps. This multi-functionality reduces the overall device structure complexity compared to having separate dedicated layers for each mode.
3Ease of manufacture
If a liquid crystal capsule is used in a single cell gap structure, then fabrication is simplified, but it is hard to align the optical axis with the design value for horizontal electric field types
Solution Approach 1:
The patent changes the cell gap parameter spatially across different areas of the liquid crystal layer. By adjusting the cell gap values in transmissive and reflective areas, the optical path difference is controlled to achieve the desired optical axis alignment and retardation values without requiring liquid crystal capsules or complex alignment structures.
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 simplifies the fabrication process, enhances transmittance, improves contrast ratio, and reduces power consumption while maintaining high brightness and resolution, and offers improved viewing angles by aligning liquid crystal molecules uniformly across different areas.
Implementation Method 1
a liquid crystal layer on the first pixel electrode, the first common electrode, the second pixel electrode and the second common electrode
Implementation Method 2
a first separation distance between the first pixel electrode and the first common electrode, the first common electrode in parallel with the first pixel electrode; a second separation distance between the second pixel electrode and the second common electrode
Data Source
AI summary
A liquid crystal display device includes: a substrate having a pixel including first and second areas; a thin film transistor on the substrate in the pixel; a first pixel electrode in the first area and connected to the thin film transistor; a first common electrode in the first area and spaced apart from the first pixel electrode by a first separation distance; a second pixel electrode in the second area and connected to the first pixel electrode; a second common electrode in the second area and spaced apart from the second pixel electrode by a second separation distance different from the first separation distance; and a liquid crystal layer on the first pixel electrode, the first common electrode, the second pixel electrode and the second common electrode.