Hemispherical Ink Light Filter Units for AMOLED Contrast
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Solution Overview
Problem
Existing full-color AMOLED displays face challenges in achieving high-resolution due to limitations in aperture ratio and production costs associated with fine metal mask (FMM) technology, which also hinders the enhancement of contrast ratio and light extraction efficiency.
Innovation Solution
The implementation of an organic light-emitting diode display with a light filter layer comprising hemispherical light filter units made of red, green, and blue ink, aligned with respective light-emitting units, to increase contrast ratio and light extraction efficiency, while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fine metal mask (FMM) technology is used to achieve full-color patterns, then full-color display is realized, but manufacturing complexity and production cost increase significantly
Solution Approach 1:
The patent extracts the color filtering function from the complex FMM process by introducing a separate light filter layer with hemispherical units. This layer is applied independently after the OLED structure is formed, eliminating the need for sophisticated FMM alignment and reducing manufacturing complexity while maintaining full-color display capability
Solution Approach 2:
The light filter layer is segmented into discrete hemispherical units (first, second, and third light filter units) corresponding to different color regions. Each hemisphere is filled with specific wavelength-range materials, allowing independent optimization of each color channel without affecting others, thus simplifying the overall manufacturing process
2Manufacturing precision
If FMM technology is used to achieve full-color patterns, then color display is enabled, but aperture ratio is limited and resolution enhancement becomes difficult
Solution Approach 1:
The patent transitions from the planar FMM approach to a three-dimensional hemispherical light filter structure. The hemispheres rise vertically from the OLED surface, allowing color filtering to occur in the vertical dimension rather than relying solely on horizontal patterning, thereby enabling higher resolution without proportionally increasing device complexity
Solution Approach 2:
The light filter units are designed as hemispheres rather than flat patterns. This curved geometry provides superior optical performance for light extraction and filtering compared to planar structures, enabling enhanced resolution and contrast ratio while maintaining manageable device complexity
3Illumination intensity
If conventional light extraction methods are used, then manufacturing is simpler, but light extraction efficiency and contrast ratio are insufficient
Solution Approach 1:
The light filter layer utilizes wavelength-selective materials that selectively absorb and transmit different color ranges. The first, second, and third hemispherical units contain materials with distinct transmission characteristics, enabling high contrast ratio and efficient light extraction by allowing only desired wavelengths to pass through each color region
Solution Approach 2:
The hemispherical geometry of the light filter units enhances light extraction efficiency through curved surface optics. The dome shape provides omnidirectional light emission and improved coupling with the OLED, achieving superior illumination intensity compared to conventional planar structures
4Illumination intensity
If aperture ratio is increased to improve display performance, then brightness is enhanced, but resolution capability is compromised
Solution Approach 1:
The hemispherical light filter units provide enhanced light extraction and directional control, allowing larger aperture ratios to be utilized effectively. The curved surfaces optimize light emission patterns, ensuring that increased aperture area translates to improved brightness without sacrificing the precision needed for high-resolution display
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
This configuration enhances the contrast ratio and light extraction efficiency, thereby reducing power consumption and overcoming the limitations of traditional FMM technology in achieving high-resolution AMOLED displays.
Implementation Method 1
the light filter units are made of red ink, the second light filter units are made of green ink, and the third light filter units are made of blue ink
Implementation Method 2
the light filter layer comprises a plurality of light filter units configured to increase light extraction efficiency of the light filter layer
Data Source
AI summary
An organic light-emitting diode display is provided. The organic light-emitting diode display includes an organic light-emitting display layer having red light-emitting units, green light-emitting units, and blue light-emitting units; a first inorganic layer disposed on the organic light-emitting display layer; and a light filter layer including a plurality of light filter units to increase light extraction efficiency of the light filter layer. The light filter units include first light filter units, second light filter units, and third light filter units. The first light filter units are aligned with the red light-emitting units; the second light filter units are aligned with the green light-emitting units; and the third light filter units are aligned with the blue light-emitting units. Material of the light filter layer is ink.