Touch-Integrated OLED Display Layout for Low-Noise Foldable Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of transparent conductive materials like ITO in touch screens is prone to breakage with repeated bending and limits the application of foldable displays, and the proximity of the ground of the driving circuit to the touch electrodes increases noise interference and reduces touch sensitivity in touch integrated displays.
Innovation Solution
Widening the gap between the ground of the driving circuit and the Tx/Rx touch electrodes, incorporating light blocking portions to prevent light reflection, and disposing pressure sensors on the thin film encapsulation layer and color filter layer to enhance touch sensitivity and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transparent conductive material like ITO is used for touch electrodes, then touch sensitivity is improved, but the display becomes susceptible to breakage with repeated bending
Solution Approach 1:
The patent uses metal mesh as a composite material alternative to traditional transparent conductive materials like ITO. The metal mesh provides both the electrical conductivity needed for touch sensitivity and the mechanical flexibility required for foldable displays, resolving the contradiction between touch sensitivity and bend resistance.
Solution Approach 2:
The patent employs thin film encapsulation layers and flexible substrate structures that allow the display to bend without breaking. This enables the use of metal mesh touch electrodes while maintaining flexibility and resistance to repeated bending, solving the reliability issue with traditional brittle conductive materials.
2Device complexity
If the ground of the driving circuit is placed close to the touch electrodes, then device complexity is reduced, but noise interference increases and touch sensitivity decreases
Solution Approach 1:
The patent applies different properties to different regions of the display structure. By creating localized shielding zones and using selective material properties in specific areas, the patent reduces parasitic capacitance effects and noise interference from the driving circuit ground while maintaining overall circuit simplicity.
Solution Approach 2:
The patent introduces intermediate layers and structures between the driving circuit ground and the touch electrodes. These intermediary elements act as shields or isolation barriers that reduce noise coupling and parasitic capacitance, allowing the ground to remain close to electrodes without significant noise interference.
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 configuration reduces noise interference and enhances touch sensitivity by minimizing parasitic capacitance effects, while also preventing light reflection that could cause camera flare in under-display cameras.
Implementation Method 1
a thin film encapsulation layer covering the plurality of organic light emitting elements
Implementation Method 2
a plurality of light blocking portions located between the color filters to block the light
Data Source
AI summary
An electronic device may include a display panel that displays an image through pixels and a window located above the display panel and through which light emitted from the display panel is transmitted. The display panel may include a light emitting area including the plurality of pixels; a plurality of organic light emitting elements located in the light emitting area to form the plurality of pixels; a thin film encapsulation layer covering the plurality of organic light emitting elements; a plurality of color filters arranged to overlap with the plurality of organic light emitting elements; and a plurality of light blocking portions located between the color filters to block the light. A plurality of first touch electrodes disposed between the plurality of light blocking portions and the thin film encapsulation layer and a plurality of second touch electrodes disposed between the thin film encapsulation layer and the window may be included.