Light Conversion Sheet Partition Walls Block Light Diffusion
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Solution Overview
Problem
Existing display devices with quantum dot-based light conversion sheets face limitations in achieving improved contrast ratio and image quality due to light diffusion, which hinders the effectiveness of local dimming techniques.
Innovation Solution
Incorporating a light conversion sheet with first and second partition walls and quantum dots that down-convert light into red, green, and blue components, strategically arranged between the display panel and the backlight unit to control light diffusion and enhance local dimming effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a quantum dot-based light conversion sheet is used to improve color quality, then color accuracy is improved, but light diffusion increases which reduces contrast ratio
Solution Approach 1:
The light conversion sheet is divided into multiple light conversion sections, each corresponding to a light-emitting section. Partition walls are introduced to separate these sections, preventing light diffusion between adjacent sections while maintaining color accuracy within each section.
Solution Approach 2:
Different regions of the light conversion sheet are assigned different functions through the partition wall structure. Each light conversion section maintains its specific color conversion properties while being isolated from adjacent sections, enabling local control of light properties to improve contrast ratio.
2Illumination intensity
If local dimming is implemented to improve contrast ratio, then contrast ratio is improved, but light diffusion from adjacent areas reduces the effectiveness
Solution Approach 1:
The backlight unit is segmented into multiple light-emitting sections that can be independently controlled for local dimming. The partition walls in the light conversion sheet correspond to these segments, ensuring that dimming in one area does not cause light leakage to adjacent areas, thereby maintaining contrast ratio improvement.
Solution Approach 2:
Partition walls act as intermediary structures between adjacent light conversion sections. These walls block light diffusion between sections, serving as a mediator that prevents harmful light interference while allowing the local dimming function to work effectively across different zones.
3Object-generated harmful factors
If partition walls are added to block light diffusion, then contrast ratio is improved, but device complexity increases
Solution Approach 1:
The partition walls are integrated into the light conversion sheet structure, combining the light blocking function with the light conversion function in a single component. This merging approach reduces overall device complexity compared to adding separate light blocking elements.
Solution Approach 2:
The partition walls serve multiple functions simultaneously: they act as structural dividers for light conversion sections, light blocking barriers to prevent diffusion, and alignment references for the backlight unit sections. This multi-functionality reduces the need for additional components.
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 effectively blocks light diffusion and enhances the contrast ratio by matching dimming signals with each area, resulting in improved image quality and increased contrast ratio.
Implementation Method 1
each of the plurality of light conversion sections includes first quantum dots emitting a first light and second quantum dots emitting a second light having a color different from a color of the first light, and the at least one light source provides light of a predetermined wavelength (e.g., blue light) to the light conversion sheet
Data Source
AI summary
A display device includes a display panel, a backlight unit, and a light conversion sheet between the display panel and the backlight unit. The backlight unit includes a substrate and light-emitting sections arranged on the substrate, one or more light sources are disposed in each of the light-emitting sections, the light conversion sheet includes first partition walls and light conversion sections arranged to correspond to the light-emitting sections, a first partition wall of the first partition walls is disposed between adjacent light conversion sections of the light conversion sections. Each of the light conversion sections includes first quantum dots emitting a first light and second quantum dots emitting a second light having a color different from a color of the first light, and the at least one light source provides light of a predetermined wavelength to the light conversion sheet.