Display Color Filter Overlapped Unit Reflectivity Reduction
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Solution Overview
Problem
Display apparatuses using white organic light-emitting elements face issues with visibility due to high reflectivity from external light, which is not addressed effectively by existing solutions like polarization plates that increase thickness and manufacturing costs, and hinder the development of flexible displays.
Innovation Solution
A display apparatus is manufactured with a color filter layer including red, green, and blue color filters on a first substrate, where the color filters are stacked in order of increasing reflectivity, and a black matrix is used to reduce reflectivity, along with a white sub-pixel that includes a color filter segment unit to minimize reflectivity while maintaining color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarization plate is attached to reduce external light reflectivity, then visibility is improved, but thickness and manufacturing costs increase
Solution Approach 1:
The patent extracts the anti-reflective function from the separate polarization plate and integrates it into the color filter layer itself. The color filter layer is designed with specific optical properties that directly reduce external light reflectivity, eliminating the need for an additional polarization plate component while maintaining the visibility improvement effect
Solution Approach 2:
The patent merges the anti-reflective function with the color filter layer by optimizing its optical characteristics. The color filter layer is designed to simultaneously perform color filtering and external light reflectivity reduction, combining multiple functions into a single integrated component that reduces overall device thickness
2Object-affected harmful factors
If a polarization plate is attached to reduce external light reflectivity, then visibility is improved, but manufacturing costs increase
Solution Approach 1:
The patent combines the anti-reflective function with the color filter layer, eliminating the need for a separate polarization plate. This integration reduces the total number of components and assembly steps, thereby lowering manufacturing costs while maintaining the visibility improvement effect
Solution Approach 2:
The color filter layer is designed to perform multiple functions simultaneously: color filtering and external light reflectivity reduction. This multi-functionality eliminates the need for separate components, reducing both manufacturing complexity and cost while achieving the desired visibility improvement
3Object-affected harmful factors
If a polarization plate is used to reduce reflectivity, then visibility is improved, but flexible display development is hindered
Solution Approach 1:
The patent removes the rigid polarization plate component and replaces it with an integrated color filter layer design that achieves anti-reflective properties without requiring thick, rigid structural elements, thereby enabling flexible display applications
Solution Approach 2:
The patent employs a thin-film color filter layer integration approach that is compatible with flexible substrate technologies. The integrated design avoids rigid components, allowing the display to be manufactured on flexible substrates and enabling bendable and flexible display applications
4Object-affected harmful factors
If color filters are stacked in order of increasing reflectivity, then external light reflectivity is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by optimizing the reflectivity characteristics of specific regions within the color filter layer. Different color filter regions are designed with appropriate reflectivity properties tailored to their specific functions, achieving overall external light reflectivity reduction while maintaining color accuracy
Solution Approach 2:
The patent addresses the reflectivity issue by optimizing the optical properties in the spectral dimension rather than adding structural complexity. The color filters are designed with specific spectral transmission and reflection characteristics that reduce external light reflectivity through optical property optimization rather than additional structural layers
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 reduces external light reflectivity, improves visibility, and allows for the production of thinner, more flexible displays by optimizing the arrangement of color filters and black matrices, thereby enhancing the display's performance and manufacturing efficiency.
Implementation Method 1
The organic light emitting layer emits a light when a hole and an electron injected through the common electrode and the pixel electrode recombine to form an exciton that decays radiatively
Implementation Method 2
a color filter layer is formed on the first substrate's side and transmits the light emitted from the organic light emitting layer, so that a color is expressed
Implementation Method 3
the color filters are stacked in order of increasing reflectivity... The color filter overlapped unit has a lower reflectivity with respect to an external light than that of the other color filters
Data Source
AI summary
Provided are a display apparatus and a method of manufacturing the display apparatus. A color filter layer including at least a red color filter, a green color filter, and a blue color filter is disposed on a first substrate. A black matrix is disposed on the color filter layer. A color filter overlapped unit where the red, green and blue color filters are overlapped is disposed in a black matrix area corresponding to the black matrix. The color filter overlapped unit has a lower reflectivity with respect to an external light than the other color filters. The color filter overlapped unit is formed in the black matrix area, and the color filter overlapped unit is formed by overlapping the blue, red and green color filters in order, and, thus, can prevent mixing of colors and reduce reflection with respect to an external light.