Light-Reflecting Wall for Quantum Dot Display Substrates
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Solution Overview
Problem
Existing display substrates face issues with color mixing due to false excitation among quantum dot display units, leading to reduced color gamut and contrast, as unabsorbed light from one unit can excite adjacent units, causing mixed colors and cross-color effects.
Innovation Solution
Incorporating a light-reflecting wall with a high reflectance threshold between adjacent display units, specifically designed with alternating layers of refractive films like TiO2 and SiO2, to reflect unabsorbed light back to the quantum dot display units, preventing false excitation and improving light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light-reflecting wall with high reflectance is introduced between display units, then color mixing is prevented and color gamut is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-reflecting wall is segmented into multiple functional layers: a light-transmissive wall structure and multiple alternating refractive film layers (high refractive index TiO2 and low refractive index SiO2). This segmentation allows each layer to perform specific optical functions, achieving high reflectance through the combined effect of multiple thin layers rather than requiring a single complex structure.
Solution Approach 2:
The light-reflecting wall employs composite material structure by combining light-transmissive wall material with alternating layers of TiO2 and SiO2 refractive films. This composite structure leverages the different optical properties of each material to achieve enhanced light reflection and color separation performance that cannot be obtained with single materials alone.
2Use of energy by moving object
If multiple alternating refractive film layers are used to increase reflectance, then light utilization is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the refractive film layers including thickness (5-20 nm per layer), refractive index contrast (TiO2 with high refractive index and SiO2 with low refractive index), and number of alternating layers (3-7 pairs). By precisely controlling these parameters, the structure achieves high light reflectance and efficient light utilization while keeping the manufacturing process manageable through standardized thin-film deposition techniques.
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 solution effectively prevents color mixing by reflecting unabsorbed light, enhancing the color gamut and contrast of the display device by ensuring accurate color emission from quantum dot units, while also optimizing the manufacturing process by reducing the number of required refractive film layers.
Implementation Method 1
a light-reflecting layer covering the light-transmissive wall, where a reflectance of the light-reflecting layer to the light in the first wavelength range is greater than the preset threshold
Implementation Method 2
the light-reflecting layer includes at least one first refractive film and at least one second refractive film, the first refractive film and the second refractive film are arranged alternately in a stacked manner, a refractive index of the first refractive film and a refractive index of the second refractive film are different
Data Source
AI summary
A display substrate, a method for manufacturing the same, and a display device are provided. The display substrate includes a base substrate, a black matrix pattern on the base substrate, display units respectively in regions defined by the black matrix pattern, and a light-reflecting wall between at least two adjacent display units, where at least one of the at least two adjacent display units is a quantum dot display unit, and a reflectance of the light-reflecting wall to light in a first wavelength range is greater than a preset threshold.