Display Assembly Light Transmitter and Quantum Dot Converter Viewing Angle
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Solution Overview
Problem
Display devices face issues with color viewing-angle inferiority due to the narrow viewing angle of blue light compared to red and green light, and reduced luminance caused by incorrect white balance and low red and green light luminance levels.
Innovation Solution
A display assembly comprising a light source that outputs blue light, a quantum dot converter that converts blue light to red and green light, and a light transmitter that scatters blue light, with the quantum dot converter and light transmitter arranged on a substrate in a specific pattern to enhance luminance and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light source with quantum dot converter is used, then the display can produce red and green light from blue light, but the viewing angle of blue light remains narrow causing color viewing-angle inferiority
Solution Approach 1:
The light field is segmented into multiple regions with different optical properties. A light transmitter portion scatters blue light to widen its viewing angle, while a quantum dot converter portion converts blue light to red and green light. This segmentation allows each region to optimize for its specific function, resolving the contradiction between viewing angle and color accuracy.
Solution Approach 2:
Different regions of the display are given different local qualities: the light transmitter region has scattering properties to expand blue light viewing angle, while the quantum dot converter region maintains color conversion properties. This local differentiation enables simultaneous optimization of viewing angle and color accuracy in different spatial zones.
2Reliability
If the quantum dot converter converts all blue light to red and green light, then color accuracy improves, but the overall luminance decreases due to low red and green light luminance levels
Solution Approach 1:
Instead of converting all blue light to red and green light, the patent applies partial conversion. The light transmitter portion allows some blue light to pass through and scatter, while the quantum dot converter portion converts a portion of blue light to red and green light. This partial action maintains adequate luminance levels across all colors while achieving acceptable white balance.
Solution Approach 2:
The patent merges the light transmitter function and quantum dot converter function into a single integrated structure. The light transmitter and quantum dot converter are positioned adjacent to each other, allowing blue light to be simultaneously transmitted/scattered and converted, thereby combining the benefits of both functions while maintaining overall luminance.
3Illumination intensity
If the light transmitter scatters all blue light, then viewing angle of blue light improves, but the area available for quantum dot conversion decreases reducing red and green light output
Solution Approach 1:
The optical path is segmented into distinct regions: a light transmitter region that scatters blue light and a quantum dot converter region that converts blue light to red and green light. This spatial segmentation ensures that both functions have adequate area to operate effectively without competing for the same space.
Solution Approach 2:
The patent transitions from a one-dimensional trade-off (area allocation) to a two-dimensional solution by arranging the light transmitter and quantum dot converter in adjacent spatial regions. This dimensional arrangement allows both functions to operate simultaneously with sufficient area, eliminating the area constraint.
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 improves color viewing angles and overall luminance by ensuring more red and green light is produced relative to blue light, correcting white balance and increasing the overall brightness of the display.
Implementation Method 1
a quantum dot converter for converting the blue light output from the light source to output at least one of red light and green light
Implementation Method 2
a light transmitter for transmitting the blue light output from the light source by scattering all or part of the blue light
Data Source
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Figure 3
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AI summary
A display assembly (1) and display device using the same is disclosed. The display assembly (1) includes a light source (2) for outputting blue light; a quantum dot converter (3) for converting the blue light output from the light source to output at least one of red light and green light; a light transmitter (6) for transmitting the blue light output from the light source by scattering all or part of the blue light; and a substrate on which the quantum converter and the light transmitter are arranged.