Color Conversion Display Optics for Viewing-Angle Color Stability
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Solution Overview
Problem
Existing display devices face challenges in improving luminance and color properties, particularly in minimizing color deviation with viewing angle and maintaining light emission efficiency of blue light.
Innovation Solution
A display device design featuring a first substrate with subpixels, blue light-emitting elements, color conversion layers, color filters, and a transmittance adjustment layer with multiple layers to optimize light transmission and minimize color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If color conversion layers and color filters are used to improve color properties, then color purity is improved, but light emission efficiency decreases
Solution Approach 1:
The patent segments the light management function into multiple components: blue light-emitting elements for direct blue light output, color conversion layers for converting blue light to other wavelengths, and color filters for purifying colors. This segmentation allows each component to perform its function optimally while minimizing overall energy loss.
Solution Approach 2:
The patent introduces an intermediary approach by providing both direct blue light paths (for efficiency) and color conversion/filter paths (for color purity). The display device uses blue light-emitting elements as the primary light source, which can directly emit blue light efficiently, while also providing color conversion layers and filters for subpixels requiring other colors, thus balancing efficiency and color purity.
2Device complexity
If conventional single-layer transmittance adjustment is used, then device complexity is low, but color deviation with viewing angle increases
Solution Approach 1:
The patent transitions from a single-layer transmittance adjustment approach to a multi-layer structure, adding the dimension of layer stacking. The first transmittance adjustment layer is disposed between the color filters and the second substrate, with a second transmittance adjustment layer having different transmittance characteristics. This multi-layer arrangement enables compensation for viewing angle effects and improves color consistency across different viewing angles.
3Quantity of substance
If blue light passes through color conversion layers, then red and green colors are produced, but blue light emission efficiency decreases
Solution Approach 1:
The patent applies local quality by allowing different subpixels to have different light paths. Blue subpixels directly emit blue light without passing through color conversion layers, maintaining high blue light efficiency. Red and green subpixels use color conversion layers to convert blue light to their respective colors. This localized approach ensures that blue light is only converted when necessary for producing red or green colors, minimizing unnecessary energy loss.
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
Enhances luminance and color properties by ensuring blue light emission efficiency and reducing color deviation across various viewing angles.
Implementation Method 1
a plurality of color conversion layers disposed on the plurality of blue light-emitting elements in a red subpixel and a green subpixel among the plurality of subpixels
Implementation Method 2
a plurality of color filters disposed on the plurality of color conversion layers in the red subpixel and the green subpixel
Implementation Method 3
a first transmittance adjustment layer disposed below the second substrate and configured to surround the plurality of color filters, in which the first transmittance adjustment layer includes a first layer disposed below the second substrate, and a second layer disposed below the first layer of the first transmittance adjustment layer and having a lower transmittance than the first layer
Data Source
AI summary
A display device can include a first substrate on which a plurality of subpixels is defined, a plurality of blue light-emitting elements respectively disposed on the plurality of subpixels, a plurality of color conversion layers, a plurality of color filters, a second substrate, and a first transmittance adjustment layer disposed below the second substrate and configured to surround the plurality of color filters. The first transmittance adjustment layer includes a first layer disposed below the second substrate, and a second layer disposed below the first layer of the first transmittance adjustment layer. The second layer of the first transmittance adjustment layer has a lower transmittance than the first layer of the first transmittance adjustment layer. Therefore, it is possible to improve color properties.