QD-OLED Composite Film for Low Reflection and Higher Luminance
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Solution Overview
Problem
QD-OLED display panels have a lower contrast ratio compared to other display panels, especially at higher ambient luminance levels, due to higher reflection values, which limits their image quality and visibility.
Innovation Solution
A composite film comprising a polarizer film, a quarter wavelength retarder film, and a reflective polarizer film is used in conjunction with a QD-OLED display panel to reduce ambient light reflections and increase luminance, thereby enhancing the contrast ratio and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a polarizer film is used to reduce ambient light reflections, then the contrast ratio is improved, but the luminance is reduced
Solution Approach 1:
The patent converts the harmful reflected ambient light into beneficial polarized light by using a quarter wavelength retarder film. The reflected light, which initially degrades contrast ratio, passes through the retarder and emerges as linearly polarized light that can be redirected by the reflective polarizer film back into the display panel, ultimately contributing to improved luminance while maintaining contrast ratio.
Solution Approach 2:
The quarter wavelength retarder film acts as an intermediary between the polarizer film and the reflective polarizer film. It transforms the circularly polarized reflected light into linearly polarized light, enabling the reflective polarizer to effectively redirect the light. This intermediary component resolves the contradiction by enabling the reflective polarizer to function properly without compromising the polarizer's reflection reduction capability.
2Illumination intensity
If a reflective polarizer film is added to increase luminance, then the luminance is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the composite film structure: the polarizer film reduces reflections, the quarter wavelength retarder film transforms polarization states, and the reflective polarizer film redirects light. This integrated multi-layer composite film achieves both contrast ratio improvement and luminance enhancement in a unified structure, managing complexity through functional integration rather than separate components.
3Illumination intensity
If multiple film layers are combined to reduce reflections and increase luminance, then the contrast ratio and luminance are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent utilizes parameter changes in the optical properties of each film layer to achieve the desired performance. The quarter wavelength retarder film specifically changes the polarization state parameter of reflected light from circular to linear polarization. By carefully controlling these optical parameters and their relationships, the patent achieves superior contrast ratio and luminance while managing manufacturing complexity through parameter optimization rather than complex structural arrangements.
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 composite film significantly improves the contrast ratio and luminance of QD-OLED display panels, reducing ambient light reflections and increasing luminance, resulting in improved image quality and visibility, especially at higher ambient luminance levels.
Implementation Method 1
The polarizer film may reduce ambient light reflections within the QD-OLED display panel
Implementation Method 2
The quarter wavelength retarder film may combine with the polarizer film to reduce the ambient light reflections
Implementation Method 3
The reflective polarizer film may increase a luminance of the QD-OLED display panel by reflecting a portion of the light produced by the image producing portion
Data Source
AI summary
A composite film for a quantum dot—organic light emitting diode (QD-OLED) display panel of an information handling system includes a polarizer film, a quarter wavelength retarder film, and a reflective polarizer film. The polarizer film reduces ambient light reflections within the QD-OLED display panel. The quarter wavelength retarder film is in physical communication with the polarizer film. The quarter wavelength retarder film combines with the polarizer film to reduce the ambient light reflections. The reduction of the ambient light reflections increases a contrast ratio for the QD-OLED display panel. The reflective polarizer film is in physical communication with the quarter wavelength retarder film. The reflective polarizer film increases a luminance of the QD-OLED display panel to a first value that is greater than a second value of the luminance created by the polarizer film and the quarter wavelength retarder film.