Display Pixel Reflection Electrode for Color Mixing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in enhancing light efficiency and preventing color mixture due to light emission from light emitting elements, particularly in the manufacturing process where separate masks are required for forming reflection films.
Innovation Solution
A method for manufacturing a display device that includes forming a connection electrode layer, bonding it to a light emitting material layer, and using sputtering etching to form a reflection portion integral with the connection electrode layer without a separate mask, thereby forming a reflection film on the sides of light emitting elements to prevent color mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate mask is used for forming a reflection film on the sides of light emitting elements, then the reflection film can be formed with good precision, but the manufacturing process complexity and time increase
Solution Approach 1:
The patent merges the connection electrode formation and reflection film formation into a single integrated process. The connection electrode material is deposited to cover both the bonding area and the side surfaces of the light emitting element, and then patterned in one step to create both the connection portion and the reflection portion simultaneously, eliminating the need for separate mask processes
Solution Approach 2:
The connection electrode is designed to serve dual functions: it provides electrical connection between the pixel electrode and light emitting element through the connection portion, and simultaneously forms a reflection film on the side surfaces of the light emitting element through the reflection portion, making a single structure perform multiple functions
2Manufacturing precision
If a separate mask is used for forming a reflection film, then the reflection film can be formed accurately, but the manufacturing time and productivity decrease
Solution Approach 1:
The patent combines multiple manufacturing steps into one by depositing the connection electrode material in a way that simultaneously forms both the connection portion and the reflection portion through a single patterning process, eliminating sequential operations and improving throughput
Solution Approach 2:
The connection electrode material is deposited in advance to cover the side surfaces of the light emitting elements before the final patterning step, so that when the pattern is formed, both the connection and reflection structures are created simultaneously without requiring additional intermediate steps
3Area of moving object
If light emitting elements are placed close together to increase display resolution, then the display density improves, but color mixture between adjacent light emission areas increases
Solution Approach 1:
The patent extracts and removes light that would otherwise cause color mixture by forming a reflection film on the side surfaces of the light emitting elements. This reflection film redirects stray light away from adjacent light emission areas, effectively eliminating the harmful light spill while allowing pixels to be placed closer together
Solution Approach 2:
The patent converts the potentially harmful stray light emission from the sides of light emitting elements into a beneficial reflection that directs light away from adjacent pixels. By placing the reflection film on the side surfaces, the harmful light leakage is transformed into controlled reflection that improves color purity and enables higher pixel density
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 effectively improves light efficiency by preventing light emission from adjacent areas from mixing, enhancing the display's color reproduction rate and manufacturing efficiency by eliminating the need for separate masks during the etching process.
Implementation Method 1
forming a reflection portion by adhering a non-volatile material from the connection electrode layer to the first insulating layer during the sputtering etching
Data Source
AI summary
A display device includes: a substrate; pixel electrodes on the substrate; light emitting elements on the pixel electrodes and extending in a thickness direction of the substrate; a first insulating layer extending around sides of the light emitting element; and a connection electrode between one of the pixel electrodes and a corresponding one of the light emitting elements. The connection electrode includes: a connection portion bonding the pixel electrode to the light emitting element; and a reflection portion integral with the connection portion and extending around the sides of the light emitting element on the first insulating layer.