OLED Cover Window Adhesive Layer for Light Reflection Reduction
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Solution Overview
Problem
OLED displays face issues with image visibility due to refractive index differences and light reflection between the cover window and the display panel assembly, leading to increased thickness and reduced reliability.
Innovation Solution
An OLED display with a cover window and display panel assembly stably coupled using an acryl-based adhesive layer, where the cover window has a light transmitting portion for the central display area and a light blocking portion for the edges, and the adhesive layer is formed using UV or heat-cured acryl-based resin to minimize thickness and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separation space is provided between the cover window and the display panel assembly, then light emission is enabled, but image visibility deteriorates due to refractive index differences and light reflection
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the cover window and the display panel assembly. This adhesive layer has a refractive index that is substantially equal to or greater than that of the cover window, serving as an optical mediator that eliminates refraction at interfaces and reduces light reflection, thereby improving image visibility while maintaining the separation space for light emission
Solution Approach 2:
The refractive index parameter of the adhesive layer is specifically selected to be substantially equal to or greater than that of the cover window. By changing this optical parameter, the adhesive layer matches the optical properties of the cover window, eliminating refraction effects and reducing reflection, thus resolving the visibility deterioration problem
2Illumination intensity
If a separation space is provided between the cover window and the display panel assembly, then light can be emitted, but the entire thickness of the OLED display becomes large
Solution Approach 1:
The adhesive layer is implemented as a thin film structure that provides the necessary optical and mechanical functions. This thin film approach maintains the separation space required for light emission while minimizing the additional thickness contribution, thus resolving the contradiction between light emission capability and overall thickness
3Illumination intensity
If the cover window is disposed separate from the display panel assembly, then light emission is possible, but stability and reliability of the display panel assembly are reduced
Solution Approach 1:
The adhesive layer serves to merge and bond the cover window to the display panel assembly, creating a unified and stable assembly structure. This bonding action maintains the separation space for light emission while simultaneously improving the mechanical stability and reliability of the overall assembly through strong adhesion
4Stability of the object's composition
If adhesive is used to couple the cover window and display panel assembly, then stability is improved, but manufacturing complexity increases
Solution Approach 1:
The adhesive layer is designed to perform multiple functions simultaneously: it provides mechanical bonding to improve assembly stability, serves as an optical medium with matched refractive index to reduce reflection and improve visibility, and acts as a bonding agent to attach the cover window to the display panel assembly. This multi-functionality reduces the need for separate components and simplifies 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 solution improves the stability and reliability of the OLED display by minimizing light reflection and thickness, while also enhancing productivity through effective coupling and protection of the integrated circuit chip.
Implementation Method 1
a cover window and a display panel assembly which are stably coupled by an adhesive layer
Implementation Method 2
visibility of an image which is displayed by the OLED display is deteriorated due to a difference in refractive indexes of the cover window and the separation space
Implementation Method 3
the adhesive layer is formed using UV or heat-cured acryl-based resin
Implementation Method 4
the adhesive layer is formed using UV or heat-cured acryl-based resin
Implementation Method 5
The OLED display emits light by energy which is generated when excitons, which are generated when electrons and holes are coupled within the organic emission layer, fall from an exited state to a ground state
Data Source
AI summary
An organic light emitting diode (OLED) display and a method of manufacturing the same. The OLED display includes: a display panel assembly including a first substrate (51) having a display area and a mounting area, a second substrate (52) coupled to the display area of the first substrate, and an integrated circuit chip (40) mounted in the mounting area of the first substrate; a cover window (10) disposed opposite the second substrate and the integrated circuit chip and covering the display panel assembly; and an adhesive layer (20) which fills up a space between the second substrate and the cover window, and a space between the mounting area of the first substrate and the cover window.