Light-Transmissible Support Layer for Foldable Display Fingerprint Sensing
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Solution Overview
Problem
In foldable display apparatuses, the support layer's poor light transmittance hinders the optical device's ability to collect sufficient return light for fingerprint identification, leading to low accuracy and speed.
Innovation Solution
A display module with a support layer featuring a light-transmissible first support part and adhesive part, integrated with a buffer layer, ensures the optical device can effectively collect return light while providing necessary structural support, using materials like ultra-thin flexible glass and thermoplastic polyurethane elastomer rubber for optimal light transmittance and elastic modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support layer uses opaque materials to provide structural support, then the structural strength is improved, but the light transmittance deteriorates, preventing the optical device from collecting sufficient return light
Solution Approach 1:
The support layer is designed with spatially varying optical properties: regions corresponding to non-display areas use opaque materials for structural support, while regions corresponding to display areas use transparent or translucent materials to allow light transmission to the optical device, thus resolving the contradiction between structural strength and light transmittance at different locations
Solution Approach 2:
The support layer employs composite material construction combining opaque and transparent/translucent materials in a single integrated structure, enabling simultaneous achievement of structural support function and light transmission function in different regions of the same component
2Strength
If the support layer thickness is increased to enhance structural support, then the structural strength is improved, but the light transmittance deteriorates, reducing optical device performance
Solution Approach 1:
The support layer thickness is optimized locally: thicker in non-display regions for structural support, and thinner in display regions to maximize light transmittance to the optical device, thus resolving the contradiction between structural support and light transmittance through spatially varying thickness
3Illumination intensity
If the support layer is made fully transparent to improve light transmittance, then the light transmittance is improved, but the structural strength deteriorates, compromising device integrity
Solution Approach 1:
The support layer uses transparent or translucent materials only in regions where light transmission is needed (display areas), while using opaque materials in regions where structural support is prioritized (non-display areas), thus resolving the contradiction between light transmittance and structural strength through spatially varying material properties
Solution Approach 2:
The support layer serves multiple functions simultaneously: it provides structural support for the flexible display device, acts as a buffer layer for mechanical stress, and enables light transmission to the optical device in display regions, all within a single integrated component
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
Enhances the sensitivity and accuracy of optical devices like fingerprint identification systems in flexible and foldable displays by allowing effective light transmission and maintaining structural integrity.
Implementation Method 1
at least a portion of the first support part is light permeable
Implementation Method 2
The adhesive part is disposed between the first support part and the wall of the first hole
Data Source
AI summary
A display module and a display apparatus are provided. The display module includes a display panel and a support layer. The support layer is disposed on a non-display side of the display panel; the support layer includes a support plate and a first support part connected with the support plate. The support plate is provided with a first hole, and the first support part is disposed in the first hole; at least a portion of the first support part is light permeable. A side surface of the support plate proximate to the display panel is substantially flush with a side surface of the first support part proximate to the display panel. A thickness of the support layer is in a range of approximately 10 μm to approximately 200 μm, inclusive.