Display Apparatus Reflective Layer Light Efficiency
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Solution Overview
Problem
Display apparatuses have low light efficiency while maintaining white balance of reflected light, which affects the accuracy and quality of color reproduction in full-color displays.
Innovation Solution
The display apparatus incorporates a bottom substrate, light-emitting elements with color filter layers and quantum dot layers, and reflective layers strategically positioned to enhance light emission efficiency while maintaining white balance. This includes a first light-emitting element with a second-color emission layer, a second-color color filter layer, a first-color color filter layer, and a bank with openings and protrusions to optimize light reflection and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color-converting portion is added to convert light from one color to another, then full-color display capability is achieved, but light efficiency decreases
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the light-emitting element and the color filter layer. This reflective layer redirects light that would otherwise be absorbed by the color filter layer back toward the viewing direction, thereby improving light efficiency while maintaining the color conversion function through the quantum dot layer.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a reflective layer with specific reflectivity characteristics. This modifies the light path and distribution, allowing more converted light to reach the viewer while maintaining color accuracy through the color filter layer.
2Loss of energy
If light efficiency is improved by adding reflective layers, then light transmission increases, but white balance of reflected light may be compromised
Solution Approach 1:
The reflective layer is positioned specifically in regions where light redirection is most beneficial, such as at the boundaries between different color regions. This localized placement ensures that white balance is maintained in critical areas while improving overall light efficiency without compromising color accuracy.
Solution Approach 2:
Instead of allowing light to be absorbed by the color filter layer and lost, the reflective layer inverts this process by reflecting the light back through the quantum dot layer and color filter layer, thereby recovering the light energy while maintaining the spectral characteristics needed for accurate white balance.
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 significantly increases light efficiency by reflecting and transmitting light through the use of reflective layers and quantum dot layers, ensuring accurate color reproduction and maintaining white balance, thus improving the overall display performance.
Implementation Method 1
a first-color quantum dot layer in (e.g., filling) the first opening
Implementation Method 2
a first reflective layer on an inner surface of the first opening of the bank and on a portion of a top surface of the first-color quantum dot layer facing the top substrate
Data Source
AI summary
A display apparatus includes: a top substrate over a bottom substrate and including a first region; a second-color color filter layer on a bottom surface of the top substrate and having a 2-1st opening exposing the first region; a first-color color filter layer including a portion in the 2-1st opening and a portion on a bottom surface of the second-color color filter layer; a bank between the first-color and the second-color color filter layers and the bottom substrate, the bank having a first opening corresponding to the first region, the first opening including a 1-1st portion overlapping the 2-1st opening and a 1-2nd portion outside the 2-1st opening; a first-color quantum dot layer in the first opening; and a first reflective layer on an inner surface of the first opening and a portion of a top surface of the first-color quantum dot layer.