OLED Light Transmitting Member UV Blocking Opening Ratio
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Solution Overview
Problem
Organic light emitting display (OLED) devices with reflective members face issues such as reduced opening ratio and transmissivity due to the scattering and diffraction of light, as well as lack of protection from ultraviolet rays, which affect the performance and visibility of the display.
Innovation Solution
Incorporating a light transmitting member that overlaps and partially covers the reflective member, which blocks ultraviolet rays and enhances the opening ratio, while also allowing for various colors and a transflective layer to improve light transmission and reduce diffraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reflective member is disposed in the front of the OLED device to reflect images, then the device can function as a mirror display, but the organic light emitting layer cannot be protected from UV rays and the opening ratio decreases
Solution Approach 1:
A light transmitting member is introduced as an intermediary component between the reflective member and the organic light emitting layer. This member selectively transmits visible light while blocking UV rays, thereby protecting the organic light emitting layer from UV damage while maintaining the mirror display function and increasing the opening ratio
2Device complexity
If the size of the reflective member is reduced due to light scattering, then the device structure is simplified, but the opening ratio of the OLED device decreases
Solution Approach 1:
The light transmitting member acts as an intermediary that allows the reflective member to be positioned closer to the front surface without compromising the opening ratio. This member enables larger reflective member areas to be used while maintaining high opening ratios, as it transmits light effectively while providing structural support
3Illumination intensity
If a metal layer is added to prevent light diffraction, then light transmission is improved, but the transmissivity of the OLED device decreases
Solution Approach 1:
The light transmitting member is designed as a composite structure combining metal particles or nanowires within a transparent matrix material. This composite structure provides diffraction control through the metal component while maintaining high transmissivity through the transparent matrix, avoiding the need for opaque metal 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 protects the organic light emitting layer from UV rays, increases the opening ratio, and allows for improved visibility and color options in OLED devices, effectively addressing the limitations of existing OLED technologies.
Implementation Method 1
The light transmitting member transmits a predetermined light
Implementation Method 2
a polarizer capable of blocking ultraviolet (UV) rays may not be used. Thus, an organic light emitting layer included in the OLED device may not be protected from the UV rays
Implementation Method 3
a mirror OLED device capable of reflecting an image of an object (or target) that is disposed in the front of the OLED device by including a reflective region and a pixel region
Implementation Method 4
a metal layer preventing a diffraction of light may be added due to a diffraction phenomenon of light
Data Source
AI summary
An organic light emitting display device includes a first substrate, a pixel structure, a second substrate, a reflective member, and a light transmitting member. The first substrate includes a plurality of pixel regions. Each of the pixel regions has sub-pixel regions and a reflective region surrounding the sub-pixel regions. The pixel structure is disposed in each of the sub-pixel regions on the first substrate. The second substrate is disposed on the pixel structure. The reflective member has an opening disposed in each of the sub-pixel regions, and is disposed in the reflective region of the second substrate. The light transmitting member covers the opening of the reflective member and partially overlaps the reflective member. The light transmitting member blocks ultraviolet rays and transmits a predetermined light.