OLED Display Color Accuracy via Light-Blocking Segmentation
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Solution Overview
Problem
Current display devices, particularly OLEDs, face challenges in achieving reliable color reproduction characteristics and efficient fabrication methods, leading to issues with color accuracy and production costs.
Innovation Solution
A display device design incorporating a base layer with thin film transistors, organic light emitting elements, inorganic encapsulation layers, color conversion patterns, and a color filter member, along with a light-blocking pattern, to enhance color reproduction and fabrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the separation distance between organic light emitting elements and color filter member is reduced to improve color reproduction, then color accuracy improves, but the risk of color mixing between adjacent pixels increases
Solution Approach 1:
The invention introduces a light-blocking pattern that divides and segments the space between adjacent organic light emitting elements. This segmentation prevents light from one pixel from mixing with adjacent pixels, enabling the color filter member to be positioned closer to the light emitting elements while maintaining color accuracy and preventing color mixing.
Solution Approach 2:
The light-blocking pattern acts as an intermediary element between the organic light emitting elements and the color filter member. It mediates the optical interaction by blocking stray light, thereby enabling reduced separation distance without compromising color reproduction quality or causing color mixing.
2Ease of manufacture
If conventional fabrication methods are used for display devices, then manufacturing process is simple, but fabrication cost and time are high
Solution Approach 1:
The invention merges the formation of the light-blocking pattern with the existing pixel definition layer fabrication process. By integrating these functions into a single fabrication step, the process remains simple while improving overall fabrication efficiency and reducing production time and costs.
Solution Approach 2:
The pixel definition layer is designed to serve multiple functions: it defines the pixel structure and simultaneously acts as the light-blocking pattern. This multi-functionality reduces the number of fabrication steps required, thereby improving productivity without complicating the manufacturing process.
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 proposed design improves color reproduction characteristics and reduces fabrication costs and time by preventing color mixing and optimizing the separation distance between organic light emitting elements and the color filter member.
Implementation Method 1
first, second, and third organic light emitting elements disposed on the base layer, each of the first, second, and third organic light emitting elements including a first electrode exposed in the opening, a second electrode disposed on the first electrode, and a light emitting layer disposed between the first electrode and the second electrode
Implementation Method 2
first color conversion pattern disposed between the first and second inorganic layers and overlapping the first organic light emitting element, and a second color conversion pattern spaced apart from the first color conversion pattern, disposed between the first and second inorganic layers, and overlapping the second organic light emitting element
Data Source
AI summary
A display device including a base layer including a thin film transistor, a pixel definition layer including an opening, first to third organic light emitting elements each including a first electrode, a second electrode, and a light emitting layer therebetween, an encapsulation member including a first inorganic layer covering the organic light emitting elements, a second inorganic layer disposed thereon, a first color conversion pattern disposed between the inorganic layers and overlapping the first organic light emitting element, and a second color conversion pattern disposed between the inorganic layers and overlapping the second organic light emitting element, and first and second color filter patterns having different colors from each other and overlapping the first and second color conversion patterns, respectively, in which colors of light emitted from the first and second color conversion patterns are substantially the same as colors of the first and second color filter patterns, respectively.