Flexible LED Display Layout With Light Shielding for Uniform Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display apparatuses require components such as liquid crystals, backlight units, and polarizing filters, making them thick and heavy, and existing LED-based displays lack flexibility.
Innovation Solution
A display apparatus with a flexible substrate featuring vertically stacked light emitting devices and a light shielding layer, eliminating the need for liquid crystals and backlight units, and allowing for efficient light extraction and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a liquid crystal display device is turned off, then power consumption is reduced, but the liquid crystal molecules remain in a tilted state causing residual image and poor display quality
Solution Approach 1:
A compensation film is introduced as an intermediary element between the liquid crystal layer and the viewer. This film contains optical compensation layers that actively work to restore the optical path difference and eliminate residual images when the display is in the off state, thereby maintaining display quality without requiring additional power consumption.
Solution Approach 2:
The patent employs a liquid crystal composition with specific molecular characteristics (rod-like structure, specific viscosity range of 5-50 cP at 20°C, and specific refractive index anisotropy) that enables the liquid crystal to return to its initial planar state more effectively after being tilted during operation. The compensation film also has specific optical parameters (refractive index anisotropy, thickness) designed to compensate for the residual tilt angle.
2Speed
If high voltage is applied to align liquid crystal molecules vertically for fast response, then response speed improves, but molecular alignment uniformity deteriorates causing display defects
Solution Approach 1:
The patent uses alignment films with different alignment modes in different regions: a first alignment film with vertical alignment capability and a second alignment film with tilted alignment capability. The compensation film also has region-specific optical compensation layers that provide localized compensation for residual images in different areas of the display, thereby maintaining both fast response and uniform alignment quality.
Solution Approach 2:
The alignment system employs composite structures including multiple alignment films with different molecular orientations and a compensation film with multiple optical compensation layers having different refractive index anisotropies. This composite approach allows the system to achieve both fast response speeds and uniform molecular alignment by combining the advantages of different material properties.
3Adaptability or versatility
If liquid crystal molecules are tilted for display operation, then display function is enabled, but residual images appear when turned off due to incomplete return to initial state
Solution Approach 1:
The compensation film acts as a mediator that detects and compensates for the residual tilt state of liquid crystal molecules when the display is turned off. The optical compensation layers in this film restore the optical path difference caused by incomplete molecular return, thereby eliminating residual images while maintaining full display functionality during operation.
Solution Approach 2:
The patent designs the liquid crystal composition and compensation film parameters in advance to prevent residual image formation. The specific viscosity range and molecular structure of the liquid crystal, combined with the pre-designed optical compensation layers, create a system that naturally returns to its initial state more completely, cushioning against the development of residual images before they can appear.
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 enables high-efficiency light extraction with low power consumption and flexibility, applicable to various electronic devices.
Implementation Method 1
a liquid crystal composition comprising a rod-like liquid crystal compound and having a viscosity of 5 cP or less at 20° C.
Implementation Method 2
the alignment film has an alignment direction that is inclined with respect to a pixel electrode extending direction
Implementation Method 3
an optical compensation layer that has a same alignment direction as the alignment film in a tilted alignment mode liquid crystal display device
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A display device is provided. The display device comprises: a flexible substrate; a plurality of light emitting diodes arranged on the substrate and spaced apart from each other; and a light shielding layer filled between the light emitting diodes and partially covering each of the light emitting diodes to define individual light emission surfaces, wherein the distances between the light emission surfaces are equal to each other.