Display Device Pressure Sensing Units and Panel Support
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Solution Overview
Problem
Display devices face challenges in minimizing sensing errors and pressure applied to pixel areas during touch actions, particularly in slim and lightweight designs where the display panel and touch panel are closely integrated, leading to increased sensitivity and potential damage risks.
Innovation Solution
The implementation of a display device with multiple pressure sensing units of varying sensitivities and elastic elements, including a first, second, and third pressure sensing unit, each with distinct moduli and thicknesses, strategically positioned to distribute and detect touch pressures, minimizing errors and preventing damage to the pixel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display panel and touch panel are brought into close contact to reduce thickness, then the device achieves slimness and lightening, but sensing errors increase and pressure on pixel area increases during touch actions
Solution Approach 1:
The pressure sensing function is segmented into multiple pressure sensing units positioned at different locations (edge portion between panel support and frame base, side portion between frame side and window edge, and display surface between flexible display panel and window). Each unit independently detects pressure at its specific location, allowing the system to distinguish between edge pressure and display surface pressure, thereby reducing sensing errors while maintaining close contact between panels
Solution Approach 2:
The panel support portion acts as an intermediary structure between the window and frame base, providing a dedicated support region that distributes pressure away from the pixel area. This intermediary structure enables the display panel to be in close contact with the touch panel for slimness while preventing excessive pressure from being directly transmitted to the pixel area during touch actions
2Measurement precision
If multiple pressure sensing units with different sensitivities are implemented, then sensing accuracy improves, but device complexity increases
Solution Approach 1:
Different pressure sensing units are assigned different sensitivities based on their local requirements. The pressure sensing unit at the edge portion has lower sensitivity to detect general pressure presence, while the unit at the display surface has higher sensitivity to detect precise touch pressure. This local differentiation of sensitivity allows accurate pressure detection across different regions without requiring complex uniform sensing mechanisms throughout the entire device
Solution Approach 2:
The patent implements pressure sensing units with varying degrees of sensitivity - some units have higher sensitivity than others. The third pressure sensing unit (between flexible display panel and window) has the highest sensitivity for precise touch detection, while the second pressure sensing unit (at frame side) has the lowest sensitivity for general pressure detection. This partial differentiation in sensitivity levels provides sufficient sensing accuracy without requiring all units to have maximum sensitivity, thereby reducing overall 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
This configuration effectively minimizes sensing errors, allows for precise detection of touch pressures, and prevents damage by displaying warning messages when excessive force is applied, ensuring the display device's integrity and slimness.
Implementation Method 1
a pressure sensing unit between the edge portion and the panel support portion... including elastic elements having different moduli
Data Source
AI summary
A display device is capable of substantially minimizing sensing errors and substantially minimizing a pressure applied to a pixel area during a touch action, the display device including: a frame; a window facing at least a portion of the frame; a panel support portion between the window and a base portion of the frame; a flexible display panel including a central portion between the panel support portion and the window and an edge portion between the panel support portion and the base portion of the frame; and a first pressure sensing unit between the edge portion and the panel support portion.