OLED Sub-Pixel Reflective Structure to Reduce Color Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED display devices face challenges in reducing light color mixing between adjacent sub-pixels and minimizing light loss due to escaped light.
Innovation Solution
The display device incorporates a substrate with a pixel comprising multiple sub-pixels, an insulating layer with indentations at sub-pixel boundaries, a common emission layer, and a color filter layer with a reflective member between adjacent color filters. The reflective member and inclined reflective layer help reflect light upward, reducing light loss and improving color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional OLED structure without reflective members is used, then the device structure is simple, but light color mixing occurs between adjacent sub-pixels and light is lost downward
Solution Approach 1:
The patent converts the harmful effect of downward-escaped light into a beneficial effect by introducing reflective members that redirect this light upward toward the color filter layer and viewing direction. The reflective members transform what would be wasted light into useful light output, simultaneously reducing light loss and preventing color mixing between adjacent sub-pixels.
Solution Approach 2:
The reflective members act as intermediary elements positioned between the OLED structure and the viewing direction. These intermediaries intercept downward-escaped light and redirect it upward, mediating the interaction between the light-emitting layers and the final light output, thereby preventing direct color mixing between adjacent sub-pixels.
2Loss of energy
If reflective members are added to reduce light loss and color mixing, then light efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies reflective members locally at specific positions where downward-escaped light occurs, rather than throughout the entire device. This localized application targets the specific problem areas at sub-pixel boundaries while maintaining simplicity in other regions, thus improving light efficiency without proportionally increasing overall device complexity.
Solution Approach 2:
The patent implements reflective members at critical locations (between adjacent sub-pixels) rather than uniformly across the entire device. This partial action approach addresses the most problematic areas where light escape and color mixing occur, achieving significant improvement in light efficiency with minimal additional structural complexity.
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 effectively reduces light color mixing and minimizes light loss by reflecting escaped light upward, enhancing the overall performance and efficiency of the OLED display device.
Implementation Method 1
a color filter layer on the organic light emitting diode, the color filter layer including a plurality of color filters and a reflective member between adjacent color filters from the plurality of color filters
Implementation Method 2
the reflective layer includes an inclined surface with respect to an extension direction of the substrate
Data Source
AI summary
A display device includes a substrate having a pixel including a plurality of sub-pixels, an insulating layer on the substrate and including an indentation at boundaries between the plurality of sub-pixels, an organic light emitting diode including a common emission layer on the insulating layer, and a color filter layer on the organic light emitting diode, wherein the color filter layer includes color filters and a reflective member between adjacent color filters.