Display Device Light-Blocking Layers for Pixel Color Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices, particularly organic light emitting diode (OLED) displays, face challenges in achieving high light efficiency and preventing color mixing between adjacent pixel areas.
Innovation Solution
The display device incorporates a light-blocking layer with specific inclination angles, a reflecting pattern, a phase delay plate, and a wire grid polarizing plate to recycle and redirect light, enhancing light efficiency and preventing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional display device structure is used, then the device complexity is low, but the light efficiency is insufficient
Solution Approach 1:
The display device is divided into multiple functional layers including pixel areas and non-light emitting areas, with each layer serving specific functions. The light-blocking layer is segmented into first and second light-blocking layers with different inclination angles to handle different light paths, thereby improving light efficiency through structured segmentation.
Solution Approach 2:
The patent introduces inclined surfaces at specific angles (first inclination angle and second inclination angle) to the light-blocking layer, transforming a conventional planar structure into a three-dimensional configuration. This dimensional change enables light to be redirected at controlled angles, improving light extraction efficiency without significantly increasing overall device complexity.
2Measurement precision
If adjacent pixel areas are placed close together, then the display resolution is improved, but color mixing between pixels occurs
Solution Approach 1:
A non-light emitting area is extracted and positioned between adjacent pixel areas. This extracted region serves as a barrier that prevents light from one pixel from leaking into adjacent pixels, thereby eliminating color mixing while maintaining high display resolution through closely spaced pixels.
Solution Approach 2:
The first light-blocking layer is configured with a first inclination angle specifically tailored to block light from the first pixel area, while the second light-blocking layer has a second inclination angle optimized for blocking light from the second pixel area. This local optimization of blocking angles for different pixel regions prevents color mixing without affecting the overall display resolution.
3Use of energy by moving object
If light is recycled within the display device, then the light efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamic light path management where light is redirected multiple times through inclined light-blocking layers and reflective surfaces. Light that would normally be lost is dynamically redirected through different paths (first light path through first light-blocking layer, second light path through second light-blocking layer) to be eventually emitted usefully, improving light efficiency through dynamic recycling.
Solution Approach 2:
Light that would normally be considered wasted or harmful (light escaping at wrong angles or light blocked by the light-blocking layer) is converted into a beneficial resource. The inclined light-blocking layers and reflective surfaces redirect this light into useful paths, transforming what would be energy loss into effective light emission, thereby improving overall light efficiency.
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 improves light efficiency by recycling light within the display device and prevents color mixing between pixel areas, resulting in enhanced image quality.
Implementation Method 1
a light-blocking layer disposed in the non-light emitting area on the light emitting layer
Implementation Method 2
a reflecting pattern filling at least a portion of the groove
Implementation Method 3
a phase delay plate disposed on the insulating layer
Implementation Method 4
a wire grid polarizing plate disposed on the phase delay plate
Data Source
AI summary
A display device includes a substrate including pixel areas and a non-light emitting area disposed between adjacent pixel areas, a driving circuit layer disposed on the substrate, a light emitting layer disposed on the driving circuit layer, a light-blocking layer disposed in the non-light emitting area on the light emitting layer and in a cross-sectional view, the light-blocking layer including a first surface facing the substrate, a second surface opposite to the first surface and forming a first inclination angle with the first surface, and a third surface opposite to the first surface, contacting the second surface, and forming a second inclination angle with the first surface, an insulating layer disposed on the light-blocking layer and including a groove in the non-light emitting area, and a reflecting pattern filling at least a portion of the groove.