Polymer Liquid Crystal Display Layout for Higher Luminance
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystals face challenges in maintaining luminance and reducing light absorption, leading to display quality degradation due to the presence of organic insulating films that absorb light and cause undesirable capacitance between wiring lines.
Innovation Solution
The organic insulating film is strategically positioned to overlap the switching element but not between the transparent substrate and the pixel electrode, reducing its volume and minimizing light absorption, while also being carefully structured to reduce capacitance and alignment failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic insulating film is formed between the transparent substrate and the pixel electrode, then insulation is provided, but light absorption increases and luminance decreases
Solution Approach 1:
The organic insulating film is extracted from the region between the transparent substrate and pixel electrode, where it would cause light absorption. Instead, the film is positioned only over the switching element, removing the harmful light absorption path while preserving the necessary insulation function over the active component.
Solution Approach 2:
The organic insulating film is applied selectively only where needed for insulation (over the switching element) rather than uniformly across the entire substrate. This localized application provides necessary insulation while minimizing light absorption in the display area.
2Reliability
If the organic insulating film volume is increased to ensure coverage, then insulation reliability improves, but light absorption increases
Solution Approach 1:
The organic insulating film is applied selectively only where needed for insulation (over the switching element) rather than uniformly across the entire substrate. This localized application provides necessary insulation while minimizing light absorption in the display area.
3Device complexity
If wiring lines are positioned closer to reduce device complexity, then capacitance between lines increases
Solution Approach 1:
The organic insulating film acts as an intermediary layer positioned over the switching element and wiring lines. This dielectric layer reduces parasitic capacitance between closely spaced wiring lines and between the pixel electrode and underlying structures, enabling more compact wiring layouts.
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 suppresses light absorption and capacitance, maintaining high luminance and display quality by reducing the organic insulating film's volume and optimizing its placement, thereby enhancing the overall performance of the display device.
Implementation Method 1
a liquid crystal layer located between the first substrate and the second substrate and including polymers and liquid crystal molecules... capable of switching between a scattering state of scattering incident light and a transmitting state of transmitting incident light
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, a liquid crystal layer including polymers and liquid crystal molecules, and a light-emitting element. The first substrate includes a transparent substrate, a scanning line, a signal line crossing the scanning line, a switching element electrically connected to the scanning line and the signal line, an organic insulating film overlapping the switching element, and a pixel electrode electrically connected to the switching element. A thickness of the organic insulating film located between the transparent substrate and the pixel electrode is less than a thickness of the organic insulating film overlapping the switching element.