Integrated Fingerprint Sensor and Touch Layer in Display Devices
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Solution Overview
Problem
Current touch display devices with separate fingerprint recognition modules increase manufacturing costs and thickness, hindering the development of lightweight and thin devices.
Innovation Solution
Integrating a fingerprint sensor layer with the touch layer under a protective layer, using a backlight with even-numbered dot backlights and a shading layer to prevent light interference, and connecting signal lines through a flexible circuit board, all while reducing the overall thickness and improving recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fingerprint recognition module is installed in the display device, then fingerprint recognition function is achieved, but manufacturing cost increases and device thickness increases
Solution Approach 1:
The patent combines the fingerprint sensor layer with the touch layer into a single integrated structure. The fingerprint sensor layer is positioned between the touch layer and the display module, sharing the same structural space. This merging eliminates the need for a separate fingerprint recognition module, thereby reducing manufacturing cost while maintaining fingerprint recognition functionality.
Solution Approach 2:
The integrated layer structure serves multiple functions: the touch layer handles touch input, the fingerprint sensor layer captures fingerprint images, and both layers share common support structures and adhesive layers. This multi-functionality allows a single structural integration to replace what would traditionally require separate modules, reducing overall device complexity and cost.
2Reliability
If a separate fingerprint recognition module is installed in the display device, then fingerprint recognition function is achieved, but device thickness increases
Solution Approach 1:
The fingerprint sensor layer is nested within the existing touch layer structure. Specifically, the fingerprint sensor layer is positioned between the touch layer and the display module, utilizing the same adhesive layers and support structures. This nesting approach allows the fingerprint recognition function to be embedded within the existing device architecture without adding external thickness.
Solution Approach 2:
By merging the fingerprint sensor layer with the touch layer into a single integrated assembly, the patent eliminates the need for separate mounting structures, adhesive layers, and support frameworks that would be required for a separate module. This consolidation significantly reduces the overall thickness contribution of the fingerprint recognition system.
3Length of stationary object
If multiple layers are integrated in the display area, then device thickness is reduced, but light interference may occur affecting fingerprint recognition accuracy
Solution Approach 1:
The patent extracts the backlight specifically for the non-display area and positions it separately from the fingerprint sensor layer. The backlight is disposed in the non-display area rather than uniformly across the entire display area, preventing direct light interference with the fingerprint sensor while still providing necessary illumination for fingerprint image capture through indirect lighting paths.
Solution Approach 2:
The patent introduces a reflective layer between the backlight and the fingerprint sensor layer. This reflective layer acts as an intermediary that controls and directs light paths, ensuring that backlight illumination reaches the fingerprint sensor at appropriate angles and intensities without causing direct interference or glare that would degrade image quality.
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 integration reduces production costs, enhances fingerprint recognition accuracy, and minimizes the device's thickness, improving user experience by combining touch and fingerprint recognition functions within a single, thinner display device.
Implementation Method 1
a backlight disposed under the protective layer and located corresponding to the non-display area, wherein the backlight comprises a plurality of even-numbered dot backlights uniformly distributed around the fingerprint sensor layer
Implementation Method 2
a shading layer disposed between a side of the fingerprint sensor layer and the backlight
Data Source
AI summary
A touch display device, including a protective layer, a display module, a touch layer, a fingerprint sensor layer, a backlight, and a shading layer. The fingerprint sensor layer and the touch layer are stacked together in the display area of the display device. By integrating the fingerprint sensor layer and the touch layer, the fingerprint recognition function can be realized while implementing the touch display, which not only reduces the production process, reduces the production cost, but also reduces the overall thickness of the display device.