Multi-layer Common Electrodes for Luminance Uniformity in LCDs
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Solution Overview
Problem
Current display devices with polymer dispersed liquid crystal layers face challenges in maintaining consistent luminance across pixels due to variations in light scattering and transmission, leading to potential decreases in display quality as distance from the light source increases.
Innovation Solution
The display device incorporates a specific configuration of common electrodes with overlapping openings and electrode portions on transparent substrates, along with a liquid crystal layer containing polymers and molecules, which adjusts light scattering based on applied voltage, ensuring consistent luminance distribution across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polymer dispersed liquid crystal layer is used for light modulation, then light scattering and transmission can be achieved, but luminance uniformity deteriorates as distance from the light source increases
Solution Approach 1:
The common electrode is divided into multiple segments (first common electrode and second common electrode) arranged in different layers. This segmentation allows independent control of electric fields in different regions, enabling compensation for luminance non-uniformity that occurs with distance from the light source.
Solution Approach 2:
The patent transitions from a single-layer electrode structure to a multi-layer electrode structure. By adding the second common electrode in a different layer, the system gains an additional dimensional degree of freedom for controlling light modulation, allowing correction of luminance uniformity issues that cannot be addressed in a single plane.
2Object-generated harmful factors
If light modulation is performed using polymer dispersed liquid crystal, then light scattering property is achieved, but light absorption increases leading to reduced display quality
Solution Approach 1:
The patent changes the electrical parameters by applying different voltages to the first and second common electrodes. By independently controlling the voltage applied to each electrode segment, the system can optimize the light scattering property while minimizing light absorption losses, thereby improving overall display quality.
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 enhances luminance uniformity and reduces light absorption, thereby maintaining display quality by optimizing light utilization and scattering within the display panel.
Implementation Method 1
a liquid crystal layer that is disposed between the first substrate and the second substrate, and contains polymers and liquid crystal molecules
Implementation Method 2
The light modulation element is disposed behind a light guide and scatters light incident from a side surface of the light guide
Data Source
AI summary
According to one embodiment, a display device includes a first substrate having a first transparent substrate and a pixel electrode, a second substrate having a second transparent substrate, a first common electrode, a second common electrode, and an insulating film disposed between the first common electrode and the second common electrode, and a liquid crystal layer. The first common electrode is disposed between the liquid crystal layer and the insulating film, and includes a first opening and a first electrode portion. The second common electrode is disposed between the insulating film and the second transparent substrate, and includes a second electrode portion overlapping the first opening.