Integrated Touch OLED Layout Without Polarizer Glare
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices with integrated touch screens face issues such as increased thickness due to adhesive layers, reflection of external light by polarizers, and color mixture due to excessive distance between the organic light emitting layer and the black matrix, which narrows the luminance viewing angle.
Innovation Solution
A display device with integrated touch screen design that includes a black matrix disposed on touch electrodes to reduce the distance between the organic light emitting layer and the black matrix, eliminates the need for a polarizer to prevent external light reflection, and maintains a reduced thickness despite incorporating color filters and touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is used to bond the lower substrate to the upper substrate, then the substrates are securely connected, but the overall device thickness increases
Solution Approach 1:
The adhesive layer is completely removed from the device structure. Instead of using an adhesive layer to bond substrates, the patent integrates the color filters and black matrix directly onto the lower substrate in the same layer where the organic light emitting device is formed, eliminating the need for separate adhesive bonding between substrates.
Solution Approach 2:
The color filter layer and black matrix layer are merged with the lower substrate layer, forming an integrated structure where multiple functional layers (color filters, black matrix, and organic light emitting device) coexist in the same substrate plane, thereby eliminating the need for additional adhesive layers and reducing overall device thickness.
2Object-affected harmful factors
If a polarizer is added to prevent external light reflection, then outdoor visibility improves, but device thickness increases
Solution Approach 1:
The polarizer layer is completely removed from the device structure. The patent achieves anti-reflection functionality without requiring a polarizer by using a black matrix layer that absorbs external light and prevents it from reaching the touch electrodes, thereby eliminating the need for additional polarizing layers and reducing device thickness.
Solution Approach 2:
The black matrix layer, originally designed to prevent color mixture, is utilized to also block external light from reaching the touch electrodes. This converts the black matrix's light-absorbing property into a dual function: preventing color mixture and blocking external light reflection, thereby eliminating the need for a separate polarizer.
3Ease of manufacture
If the distance between the organic light emitting layer and the black matrix is increased, then manufacturing ease improves, but color mixture occurs and luminance viewing angle narrows
Solution Approach 1:
The color filters and black matrix are integrated into the lower substrate layer at the same level as the organic light emitting device, eliminating the need for large spacing. This merging of layers allows the black matrix to be positioned immediately adjacent to the organic light emitting layer, effectively preventing color mixture while maintaining manufacturing simplicity through a unified layer structure.
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 design enhances luminance viewing angle, reduces thickness, and improves outdoor visibility by preventing external light reflection, while maintaining the functionality of integrated touch screens.
Implementation Method 1
when a high-level voltage is applied to the anode electrode and a low-level voltage is applied to the cathode electrode, a hole and an electron move to the organic light emitting layer through the hole transporting layer and the electron transporting layer and are combined with each other in the organic light emitting layer to emit light
Implementation Method 2
red, green, and blue color filters for realizing red, green, and blue
Implementation Method 3
a black matrix for dividing the color filters
Data Source
AI summary
Disclosed is a display device with integrated touch screen, which prevents external light from being reflected by touch electrodes without a polarizer. The display device includes an organic light emitting device layer disposed on a substrate, a plurality of color filters disposed on the organic light emitting device layer, a plurality of first touch electrodes and a plurality of second touch electrodes disposed on the plurality of color filters to overlap a boundary portion between the plurality of color filters, and a black matrix disposed on the plurality of first touch electrodes and the plurality of second touch electrodes to overlap the plurality of first touch electrodes and the plurality of second touch electrodes.