Touch Sensing Unit Light Reflection Reduction
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Solution Overview
Problem
Display devices with touch sensing units face challenges in minimizing light reflection, which affects touch sensitivity and image quality, particularly due to the design of the touch sensing electrodes and insulating layers.
Innovation Solution
The implementation of a touch sensing unit with specific patterns of first and second lines, where the second lines are wider and overlap the first lines, and the use of insulating layers to flatten the surface and reduce light reflection, includes a buffer layer and encapsulation layer to prevent moisture and impurities, and an inorganic layer to enhance coupling and prevent penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the touch sensing unit uses conventional electrode patterns, then the touch sensing function is achieved, but light reflection occurs affecting image quality
Solution Approach 1:
The touch sensing unit is divided into multiple segments: first sensing electrodes, second sensing electrodes, first insulating layers, and second insulating layers. This segmentation allows each component to be optimized independently - the insulating layers are specifically designed to reduce light reflection while the electrode patterns maintain touch sensitivity, thus resolving the contradiction between reducing harmful light reflection and maintaining reliable touch sensing.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the electrode patterns and the display panel. These insulating layers act as mediators that reduce light reflection from the electrode surfaces while allowing the touch sensing function to continue operating through the layered structure, thereby eliminating the direct conflict between touch sensitivity and light reflection.
2Reliability
If the touch sensing electrodes are designed with larger width for better sensitivity, then touch sensitivity improves, but light reflection increases
Solution Approach 1:
Different regions of the touch sensing unit are given different properties: the electrode patterns are designed with appropriate widths for sensitivity, while the insulating layers covering these electrodes are specifically engineered with optical properties that reduce light reflection. This local differentiation allows each component to optimize its function without compromising the other, resolving the contradiction between electrode width for sensitivity and light reflection.
3Object-affected harmful factors
If multiple insulating layers are added to reduce light reflection, then image quality improves, but device complexity increases
Solution Approach 1:
The insulating layers serve multiple functions simultaneously: they provide electrical insulation between different electrode layers, mechanically support the electrode patterns, and optically reduce light reflection from the electrode surfaces. By making the insulating layers multi-functional, the patent reduces device complexity compared to using separate components for each function, while still achieving reduced light reflection through the layered structure.
Data Source
AI summary
Disclosed herein is a display device. The display device includes: a display panel including a substrate; and a touch sensing unit located on the substrate. The touch sensing unit includes: a first pattern including a plurality of first lines; a first insulating layer located on the first pattern; and a second pattern located on the first insulating layer, and including a plurality of second lines overlapping the first lines in parallel with each other on a plane. Both side first boundary lines defining a width of each of the first lines are located between both side second boundary lines defining a width of each of the second lines on a plane.