OLED Display Input Sensing Layer Light Collection
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Solution Overview
Problem
Current display apparatuses, particularly OLEDs, face challenges in enhancing optical efficiency and contrast ratio, leading to suboptimal display quality due to issues with light collection and lateral light management.
Innovation Solution
The display apparatus incorporates a unique input sensing unit with a structure that includes a plurality of organic light emitting elements, a light blocking layer, and an insulating layer with recessed light collecting patterns and an overcoat layer, which improves light collection and reduces lateral light interference by strategically positioning these components to enhance optical efficiency and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional OLED display structure is used, then the display apparatus can be manufactured with standard processes, but the optical efficiency and contrast ratio are insufficient due to poor light collection and lateral light interference
Solution Approach 1:
The input sensing unit is designed to serve multiple functions: it acts as both a touch sensing electrode and a light collecting structure. The insulating layer with recessed patterns and the overcoat layer with protrusion patterns work together to collect lateral light while maintaining the capacitive sensing function, eliminating the need for separate light collecting components and improving optical efficiency without proportionally increasing device complexity
Solution Approach 2:
The patent introduces vertical dimension features through recessed patterns in the insulating layer and protrusion patterns in the overcoat layer. These three-dimensional structures are positioned at specific heights to intercept and redirect lateral light toward the viewer, transforming the conventional two-dimensional planar structure into a multi-dimensional optical management system that enhances contrast ratio and optical efficiency
2Reliability
If lateral light is not managed, then the device structure remains simple, but the contrast ratio and display quality deteriorate
Solution Approach 1:
The insulating layer and overcoat layer serve as intermediary structures between the organic light emitting elements and the external environment. These layers include recessed and protrusion patterns that act as optical mediators to intercept, redirect, and manage lateral light before it reaches the viewer, thereby improving contrast ratio without requiring complex additional light management components
Solution Approach 2:
The light collecting patterns are strategically positioned in specific locations: recessed patterns in the insulating layer and protrusion patterns in the overcoat layer are located at heights and positions optimized for intercepting lateral light. This localized structural modification targets specific optical problems in different regions of the display, improving contrast ratio where needed while maintaining overall structural 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
This configuration increases optical efficiency and improves the contrast ratio, resulting in enhanced display quality by effectively managing light emission and reducing lateral light interference, thereby providing a superior viewing experience.
Implementation Method 1
an insulating layer with recessed light collecting patterns and an overcoat layer with protrusion patterns, which improves light collection and reduces lateral light interference
Implementation Method 2
the OLED apparatus displays an image by using organic light emitting elements that generate light through recombination of electrons and holes
Data Source
AI summary
A display apparatus includes: a display layer including a plurality of organic light emitting elements, and defining a plurality of light emitting areas and a non-light emitting area surrounding the light emitting areas; and an input sensing layer on the display layer. The input sensing layer includes: a first conductive pattern on the display layer; an insulating layer on the first conductive pattern to cover the first conductive pattern, and defining a plurality of light collecting patterns overlapping with the light emitting areas in a plan view; a second conductive pattern on a top surface of the insulating layer; and an overcoat layer on the second conductive pattern to cover the insulating layer and the second conductive pattern. Each of the light collecting patterns is recessed downward from the top surface of the insulating layer.