Optical Diffuser for Display Panel Light Uniformity
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Solution Overview
Problem
Display panels with small-sized light emitting units face challenges in achieving high display quality and reliability due to photo-oxidation and photo-bleaching of semiconductor nanoparticles in the color conversion layer, leading to reduced color conversion efficiency and potential carbonization of the matrix, especially when high-energy light is focused on a small area.
Innovation Solution
Incorporating optical diffusers between the light emitting units and the color conversion regions to uniformly disperse light, with the diffusers being physically or optically spaced apart and having a longer length than the light extraction surface of the emitting units, thereby minimizing high-intensity bright spots and reducing light-focused areas that can cause damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If small-sized light emitting units are used to achieve high-definition displays, then display resolution is improved, but photo-oxidation and photo-bleaching of semiconductor nanoparticles occur more severely, reducing reliability
Solution Approach 1:
A light diffuser is introduced as an intermediary component between the light emitting unit and the color conversion layer. This diffuser uniformly scatters the light before it reaches the semiconductor nanoparticles, preventing concentrated high-energy light exposure that causes photo-oxidation and photo-bleaching, thereby maintaining reliability while preserving the high resolution benefits of small light emitting units.
2Illumination intensity
If high-energy light is focused on a small area to maintain brightness, then luminance is improved, but photo-oxidation and photo-bleaching of semiconductor nanoparticles increase, reducing color conversion efficiency
Solution Approach 1:
The light diffuser acts as a mediator that redistributes the high-energy light uniformly across the color conversion layer. This maintains the total luminance output while preventing localized concentration of energy that would cause photo-oxidation and photo-bleaching, thereby preserving color conversion efficiency.
Solution Approach 2:
The light diffuser changes the spatial distribution parameter of the light intensity. By transforming concentrated light into uniformly distributed light, the system maintains the same total energy output (luminance) while altering the intensity distribution to prevent damage to semiconductor nanoparticles.
3Illumination intensity
If optical diffusers are added to uniformly disperse light, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The light diffuser is implemented as a thin film or layer with specific optical properties, rather than a complex mechanical structure. This thin-film approach achieves uniform light dispersion while minimizing the increase in device complexity, as the diffuser can be integrated into the existing display stack without adding significant structural complexity.
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 display quality by maintaining luminance uniformity and reducing photo-oxidation, ensuring high reliability and efficiency even with small-sized light sources, while maintaining a simple driving design for high-definition displays.
Implementation Method 1
Incorporating optical diffusers between the light emitting units and the color conversion regions to uniformly disperse light
Implementation Method 2
the first color conversion region includes first semiconductor nanoparticles and the first color conversion region is configured to (e.g., converts) a third light emitted from the first light emitting unit to a first light
Data Source
AI summary
A display panel includes a light emitting panel including a light emitting unit; and a color conversion panel. The color conversion panel includes a color conversion layer including a color conversion region including semiconductor nanoparticles, and a partition wall defining the color conversion region. An optical diffuser is between the light emitting unit and the color conversion region to cover a light extraction surface of the light emitting unit. A length of the light extraction surface of the light emitting unit is greater than or equal to about 500 nm and less than or equal to about 100 μm and a ratio of a length of the optical diffuser to the length of the light extraction surface of the light emitting unit is greater than or equal to about 1.4:1 and less than or equal to about 60:1.