Low-Reflective OLED Display Stack Without Polarizer or Color Filter
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Solution Overview
Problem
Existing display devices face challenges in achieving high display quality and light efficiency due to the presence of polarization plates and color filters, which increase thickness and reduce transmittance and reflectivity.
Innovation Solution
A display device design that includes a low reflective window with a specular component reflectivity of 4.12% or less, a display element layer with a low reflective layer containing bismuth and/or ytterbium, and an optical control layer with a color pattern part and an overcoat layer, which does not overlap the luminous areas, enhancing display quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization plates and color filters are used to achieve high display quality, then display quality is improved, but device thickness increases and transmittance decreases
Solution Approach 1:
The patent removes the polarization plate and color filter layers from the display device structure. Instead of using these traditional components, the invention employs a low reflective window with reduced specular component reflectivity (SCI ≤ 4.12%) combined with an optical control layer containing color pattern part and overcoat layer, achieving display quality without the thickness penalty of conventional components.
Solution Approach 2:
The patent changes the optical parameters of the window by controlling the specular component include (SCI) reflectivity to be 4.12% or less. This parameter change enables the window to function as both a protective barrier and an optical control element, eliminating the need for separate polarization and color filtering layers while maintaining display quality.
2Reliability
If polarization plates and color filters are used to achieve high display quality, then display quality is improved, but light transmittance decreases
Solution Approach 1:
The patent extracts and removes the polarization plate and color filter layers that cause light loss. The replacement structure uses a low reflective window with controlled SCI reflectivity combined with an optical control layer, which maintains display quality while improving overall light transmittance by eliminating the absorption and reflection losses inherent in traditional polarization and color filtering.
Solution Approach 2:
The patent converts the potentially harmful high reflectivity of conventional windows into a beneficial low reflective property. By controlling the SCI reflectivity to be 4.12% or less, the window reduces harmful light reflection while maintaining structural integrity, thereby improving light transmittance and display quality simultaneously.
3Strength
If conventional window materials are used, then structural integrity is maintained, but reflectivity is high and transmittance is reduced
Solution Approach 1:
The patent changes the optical parameters of the window material by controlling the specular component include (SCI) reflectivity to be 4.12% or less. This parameter change enables the window to maintain structural integrity while significantly improving light transmittance, as the low reflective property reduces light loss without compromising the window's mechanical strength.
Solution Approach 2:
The patent employs a composite structure consisting of a low reflective window material with controlled optical properties combined with an optical control layer containing color pattern part and overcoat layer. This composite approach allows the window to provide both structural integrity and optimized optical performance, achieving low reflectivity and high transmittance simultaneously.
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 design results in increased display quality and light efficiency by reducing the area of light-emitting regions, minimizing reflectivity, and maintaining high transmittance across various wavelengths, while eliminating the need for polarization plates and color filters.
Implementation Method 1
a low reflective layer disposed on the second electrode. The low reflective layer includes bismuth (Bi) and/or ytterbium (Yb)
Implementation Method 2
The low reflective layer includes bismuth (Bi) and/or ytterbium (Yb)
Implementation Method 3
an ultraviolet blocking layer disposed between the display element layer and the optical control layer and/or disposed between the optical control layer and the low reflective window. The ultraviolet blocking layer may have a transmittance of about 10% or less with respect to light in a wavelength region of about 410 nm or less
Implementation Method 4
an optical control layer disposed on the display element layer. The optical control layer includes a color pattern part that does not overlap the luminous area and an overcoat layer disposed on the color pattern part
Data Source
AI summary
A display device includes luminous and non-luminous areas. The display device includes a display element layer, an optical control layer, and a low reflective window, stacked in the order provided. The low reflective window has SCI reflectivity of 4.12% or less. The display element layer includes a pixel definition film where a pixel opening that does not overlap the luminous area is defined. A first electrode is exposed through the pixel opening. An emission layer is disposed on the first electrode. A second electrode is disposed on the emission layer. A low reflective layer is disposed on the second electrode and includes bismuth (Bi) and/or ytterbium (Yb). The optical control layer includes a color pattern part that does not overlap the luminous area, and an overcoat layer disposed on the color pattern part and overlapping the luminous and non-luminous areas.