Polishing Organic Layer for Uniform Display Luminance
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Solution Overview
Problem
In organic light emitting displays, the formation of steps by driving elements such as transistors can make it difficult to control the thickness of the organic light emitting layer, leading to non-uniform luminance and visible defects.
Innovation Solution
A method involving the formation of a conductive layer, an organic layer with partially exposed holes, and polishing using a slurry with a pH of 6.0 or higher and polishing aids like polyacrylamide, polyacrylic acid, or polyaminoether to achieve a flat surface, thereby improving luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If driving elements such as transistors are arranged on the base to control the organic light emitting element, then the display device can be configured with thin and lightweight structure and low power consumption, but steps are formed that make it difficult to control the thickness of the organic light emitting layer, leading to non-uniform luminance and visible defects
Solution Approach 1:
An organic layer is formed in advance over the driving elements (transistors, wirings, and auxiliary electrodes) before forming the light emitting element. This preliminary organic layer compensates for the steps created by the driving elements, enabling subsequent precise control of the light emitting layer thickness and ensuring uniform luminance across the display device.
2Shape
If driving elements are arranged on the base, then the display device achieves thin and lightweight configuration, but the steps formed cause non-uniform luminance and visible patterns from the outside
Solution Approach 1:
An organic layer is deposited beforehand over the driving elements to compensate for step differences. This preliminary layer creates a flat surface that enables uniform thickness control of the subsequent light emitting layer, ensuring consistent luminance and preventing visible patterns while maintaining the thin and lightweight structure.
3Ease of manufacture
If the thickness of the organic light emitting layer is not controlled uniformly due to steps, then the display device can be manufactured with driving elements, but the luminance becomes non-uniform and steps are visible
Solution Approach 1:
An organic layer is formed in advance over the driving elements before creating the light emitting element. This preliminary step compensates for the steps introduced during driving element formation, enabling precise control of the light emitting layer thickness and ensuring uniform luminance without compromising the ease of manufacturing driving elements.
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 method enhances the display quality by ensuring uniform light emission and preventing the visibility of internal patterns, resulting in improved luminance and resolution.
Implementation Method 1
polishing an upper surface of the organic layer... bringing the upper surface of the organic layer and the conductive layer exposed by the hole into contact with a polishing slurry; and polishing the upper surface of the organic layer by using the polishing slurry and a polishing pad
Data Source
AI summary
In a method of manufacturing a display device, the method includes: forming a conductive layer on a base; forming an organic layer, with a hole partially exposing the conductive layer, on the conductive layer; polishing an upper surface of the organic layer; and forming a light emitting element on the polished organic layer.