Transflective Layer for Quantum Dot Display Light Recycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In current quantum dot (QD) display technologies, a significant portion of blue light from the backlight source is transmitted through the QD structure without exciting the QD blocks, leading to low utilization of blue light and potential cross-color interference, which affects the display effect.
Innovation Solution
A display substrate is designed with a transflective layer and QD structure stacked away from a base substrate, where the transflective layer reflects the first wavelength range of light (e.g., blue light) and transmits the second wavelength range, allowing the QD structure to be excited and improving light utilization while avoiding cross-color interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional QD structure is used without a transflective layer, then the structure is simple, but blue light is transmitted through the QD structure without exciting the QD blocks, leading to low utilization of blue light and potential cross-color interference
Solution Approach 1:
The transflective layer reflects the blue light that would otherwise be wasted (transmitted through without exciting QD blocks) back toward the QD structure, converting the harmful effect of light transmission into a beneficial effect of light recycling and multiple excitation opportunities
Solution Approach 2:
The transflective layer is positioned at a different spatial location (below the base substrate) to intercept and reflect blue light back through the QD structure, adding a new optical path dimension that increases light utilization without complicating the existing QD block arrangement
2Reliability
If blue light is transmitted through the QD structure without being utilized, then the structure allows light transmission, but this leads to cross-color interference that affects display effect
Solution Approach 1:
The transflective layer captures the harmful transmitted blue light and redirects it back through the QD structure, converting the harmful cross-color interference into a beneficial secondary excitation opportunity that enhances color purity and display reliability
3Productivity
If the transflective layer is added to reflect blue light and improve utilization, then light utilization is enhanced, but the device structure becomes more complex
Solution Approach 1:
The transflective layer serves dual purposes: it reflects blue light to improve utilization efficiency while its simple planar structure below the base substrate avoids adding complex three-dimensional elements, achieving productivity improvement with minimal complexity increase
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 enhances the utilization of the first wavelength range light and prevents cross-color interference, thereby improving the display effect by reflecting unutilized light back to the QD structure for excitation and maintaining color purity.
Implementation Method 1
the transflective layer is configured to reflect the light in the first wavelength range
Implementation Method 2
the QD structure is configured to emit light in a second wavelength range under excitation by light in a first wavelength range
Implementation Method 3
the transflective layer comprises at least one of a left-handed cholesteric phase liquid crystal layer and a right-handed cholesteric phase liquid crystal layer
Data Source
AI summary
The present disclosure discloses a display substrate, a method for manufacturing same, and a display device, relating to the field of display technologies. The display substrate comprises a base substrate, and a transflective layer and a quantum dot (QD) structure that are sequentially stacked in a direction away from the base substrate. The QD structure is configured to emit light in a second wavelength range under excitation by light in a first wavelength range. The second wavelength range is outside the first wavelength range. The transflective layer is configured to reflect the light in the first wavelength range and transmit the light in the second wavelength range.