Touch Sensor Integration in Display Devices
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Solution Overview
Problem
Current display devices with touch sensing functionality face challenges in efficiently integrating touch sensors with display panels while maintaining durability, thickness, and touch sensing accuracy, often resulting in complex structures that are prone to defects and increased thickness.
Innovation Solution
A display device design that includes a display panel, a printed circuit board (PCB) connected to the panel, and a touch sensor, where the PCB and touch sensor are directly connected using conductive pads, and a composite sheet providing additional functionality such as buffering, strength reinforcement, heat dissipation, and electromagnetic shielding, all integrated with a flexible circuit film and driving chips to simplify the structure and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensors are integrated with display panels using conventional methods, then touch sensing functionality is achieved, but device thickness increases and structure becomes complex
Solution Approach 1:
The patent combines the touch sensor and display panel into a single integrated structure where the touch sensor is positioned on the rear surface of the display panel, eliminating the need for separate touch sensor modules and reducing overall device complexity while maintaining touch sensing functionality
Solution Approach 2:
The display panel serves dual functions as both the display medium and the substrate for the touch sensor, with the touch sensor utilizing the same structural framework, thereby reducing the number of separate components and simplifying the overall device architecture
2Reliability
If multiple functional layers are added to the display device, then durability and functionality are improved, but device thickness increases
Solution Approach 1:
The patent embeds the touch sensor within the display panel structure by positioning it on the rear surface, nesting multiple functional layers (display panel, touch sensor, connection portions) in a compact vertical arrangement that maintains durability without significantly increasing device thickness
Solution Approach 2:
The connection portions extend in the vertical direction (thickness direction) to connect the touch sensor and display panel, allowing electrical connections to be made without increasing the horizontal footprint, thus maintaining a thin profile while achieving reliable connectivity
3Reliability
If conventional touch sensor integration methods are used, then touch sensing is achieved, but touch sensing accuracy decreases due to structural complexity
Solution Approach 1:
By integrating the touch sensor directly with the display panel and eliminating intermediate layers and complex connection structures, the patent reduces signal interference and improves touch sensing accuracy while maintaining reliable touch detection functionality
Data Source
AI summary
A display device includes a display panel, a first printed circuit board (PCB) on the display panel, and a first touch sensor between the display panel and the first PCB. The PCB includes a first connection portion on a surface of the first PCB facing the first touch sensor. The first touch sensor includes a second connection portion on a surface of the first touch sensor facing the first PCB and electrically connected to the first connection portion.