Display Module Sensor Integration for Touch and Pressure Detection
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Solution Overview
Problem
Current display devices face challenges in simultaneously detecting user touch and pressure with high accuracy and efficiency, particularly in integrating sensors that can vary capacitance or resistance effectively to differentiate between touch and pressure inputs.
Innovation Solution
A display module comprising a base member with integrated portions, a circuit layer with transistors, a light emitting element layer, an encapsulation layer, and sensors that include electrodes or strain gauges to detect touch and pressure by varying capacitance or resistance, with a specific configuration of pads and a printed circuit board to facilitate signal transmission and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If sensors are integrated into the display module to detect user touch and pressure, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the display module with integrated sensors (first sensor on encapsulation layer, second sensor on base member) to detect both touch and pressure. The sensors are merged into the existing display structure rather than being separate components, allowing simultaneous detection functions while maintaining a unified device architecture.
Solution Approach 2:
The display module is designed with multi-functional capability: it serves as both the display interface and the sensing interface. The same structural components (base member, encapsulation layer) support both display elements and sensor elements, enabling the display module to perform multiple functions (visual output, touch detection, pressure detection) without requiring entirely separate systems.
2Measurement precision
If multiple sensors are integrated to differentiate between touch and pressure inputs, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing system is segmented into two distinct sensor types: a first sensor positioned on the encapsulation layer for detecting touch inputs, and a second sensor positioned on the base member for detecting pressure inputs. This segmentation allows each sensor to specialize in detecting specific input types, improving the precision of differentiation between touch and pressure while maintaining manageable complexity through functional division.
Solution Approach 2:
Different sensor types are placed at different locations within the display module structure. The first sensor is located on the encapsulation layer closer to the user interface, while the second sensor is positioned on the base member deeper in the structure. This local differentiation in sensor placement and type enables precise detection of different input characteristics (touch vs. pressure) based on their physical locations.
3Measurement precision
If sensors are disposed on multiple layers (encapsulation layer and base member), then detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The sensors are integrated into the display module during the manufacturing process rather than being added as a separate post-assembly step. The first sensor is disposed on the encapsulation layer and the second sensor on the base member as part of the layered construction sequence, allowing sensor integration to be performed preliminarily during fabrication when layers are being assembled, thereby reducing subsequent manufacturing complexity.
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
Enables accurate detection of user touch and pressure applied to the display module, enhancing user interaction by differentiating between touch and pressure inputs through precise capacitance or resistance variations, thereby improving the overall user experience.
Implementation Method 1
the second sensor may include a plurality of electrodes, and when a pressure is applied from the outside, a capacitance provided by the plurality of electrodes may be varied
Implementation Method 2
the second sensor may include a strain gauge
Data Source
AI summary
A display module includes a display panel, a touch sensor, and a pressure sensor. A base member of the display panel includes a first portion, a second portion extending from the first portion, and a third portion extending from the second portion. The touch sensor is disposed on the first portion of the base member. The pressure sensor is disposed on the third portion of the base member. When the second portion of the base member is bent, the pressure sensor overlaps the first portion of the base member.