Display Panel Shielding Structure for Active Stylus Interference
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Solution Overview
Problem
Signal interference occurs between display panels and active styluses due to differing driving frequencies, affecting the sensitivity of the stylus during use.
Innovation Solution
A display panel design incorporating a first shielding structure in the same layer as the cathode and a second shielding structure in the same layer as the anode, which overlap with touch traces to shield circuit signals, reducing interference and enhancing stylus sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel and active stylus operate simultaneously with different driving frequencies, then the display function is achieved, but signal interference occurs between the display panel and stylus, resulting in signal delay and reduced stylus sensitivity
Solution Approach 1:
A shielding structure is introduced as an intermediary element between the touch trace and the display circuit layer. This shielding structure includes a shielding electrode and shielding insulating layer that mediate the electromagnetic interaction, blocking harmful signal interference from the display panel while allowing the stylus to maintain its driving frequency and sensitivity
Solution Approach 2:
The patent converts the harmful electromagnetic interference from the display panel into a beneficial shielding effect. By positioning the shielding structure to overlap with the touch trace, the display panel's electromagnetic field is transformed into a controlled shielding environment that protects the stylus signal while maintaining display functionality
2Reliability
If a shielding structure is added to reduce signal interference, then stylus sensitivity is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The shielding structure is merged with the existing touch layer structure. The shielding electrode is integrated into the same layer as the touch trace, and the shielding insulating layer is combined with the touch insulating layer, reducing the need for separate shielding components and simplifying the overall device structure
Solution Approach 2:
The shielding structure serves multiple functions: it acts as both a shielding element to block signal interference and maintains the touch functionality. The same shielding electrode and insulating layer protect against interference while preserving the touch trace's ability to detect stylus input, eliminating the need for dedicated separate shielding components
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 shielding structures effectively reduce signal interference, improving the sensitivity and user experience of touch tools like styluses by ensuring precise and responsive interactions.
Implementation Method 1
The first shielding structure and the first electrode are located in a same layer. The first shielding structure at least partially overlaps with the touch trace along a direction perpendicular to a plane of the substrate
Data Source
AI summary
Provided are a display panel and a display apparatus. A display layer in the display panel is located at a side of the circuit layer away from the substrate. The display layer includes a pixel definition layer, first electrodes and second electrodes. The pixel definition layer has openings exposing the second electrodes. At least part of the first electrodes is located in the openings. The touch layer is located at a side of the display layer away from the substrate, and includes a touch trace. The touch trace overlaps with the pixel definition layer along a direction perpendicular to a plane of the substrate. The first shielding structure and the first electrode are located in a same layer. The first shielding structure at least partially overlaps the touch trace along the direction perpendicular to the plane of the substrate.