Stretchable Display LED Optical Layers for Luminous Efficiency
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Solution Overview
Problem
Current display devices lack enhanced luminous efficiency and color purity, particularly in flexible and stretchable configurations, which are essential for next-generation display technologies.
Innovation Solution
A stretchable display device featuring a flexible substrate with a pattern layer, pixels, and connection lines, where light emitting diodes (LEDs) are divided into emission and non-emission areas, and accompanied by a color conversion layer below and a color transmission layer above, optimizing light reuse and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional LED structure is used in a stretchable display device, then the device can be made flexible and stretchable, but the luminous efficiency is insufficient
Solution Approach 1:
The LED is divided into an emission area and a non-emission area. The emission area is positioned over the color conversion layer while the non-emission area is positioned over the reflection layer, allowing different portions of the LED to serve different optical functions and improve overall luminous efficiency
Solution Approach 2:
A color conversion layer is introduced between the LED emission area and the underlying reflection layer. This intermediary layer converts the wavelength of light emitted by the LED, enabling more efficient use of the emitted light and improving luminous efficiency without adding significant structural complexity
2Manufacturing precision
If conventional light emission structure is used, then the device structure remains simple, but the color purity is insufficient
Solution Approach 1:
A color transmission layer is positioned over the LED emission area to selectively transmit specific wavelengths of light. This intermediary layer filters the emitted light to improve color purity, allowing only the desired color wavelengths to pass through while blocking others
Solution Approach 2:
Different layers are applied selectively to different areas of the LED: the color conversion layer is positioned over the emission area while the reflection layer is positioned over the non-emission area. This localized application of different optical properties optimizes color purity without requiring complex structures across the entire device
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 significantly improves luminous efficiency and color purity by converting and transmitting specific wavelengths of light, enabling high-performance display even in bent or extended states.
Implementation Method 1
a color conversion layer which converts a wavelength of light emitted by the light emitting diode
Implementation Method 2
a color transmission layer which transmits only light of a predetermined wavelength
Data Source
AI summary
According to aspects of the present disclosure, a display device includes a stretchable lower substrate; a pattern layer which is disposed on the lower substrate and is configured by a plurality of plate patterns and a plurality of line patterns; a plurality of pixels which is disposed on each of the plurality of plate patterns; and a plurality of connection lines which is disposed on each of the plurality of line patterns and connects the plurality of pixels, each of the plurality of pixels includes a light emitting diode and a driving element which drives the light emitting diode, the light emitting diode is divided into an emission area in which light is emitted and a non-emission area in which light is not emitted, a color conversion layer is disposed below the emission area of the light emitting diode, and a color transmission layer is disposed on the emission area of the light emitting diode, thereby improving the luminous efficiency of the light emitting diode.