Display Light Guide Structure for Accurate Fingerprint Sensing
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Solution Overview
Problem
Existing light fingerprint recognition technologies face challenges in improving accuracy due to light noise interference affecting the sensing devices used in fingerprint identification processes.
Innovation Solution
The proposed display device incorporates light transmission structures with a first light guide element and reflectors arranged on either side, creating a light guide channel that increases the amount of light transmitted to photosensitive units, enhancing light sensitivity and accuracy in fingerprint identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If light fingerprint recognition is used with simple sensing devices, then the ease of operation is improved, but the measurement precision deteriorates due to light noise interference
Solution Approach 1:
The patent introduces a light guide structure as an intermediary component between the light source and the sensing device. This light guide structure channels and concentrates light onto the fingerprint sensing area, serving as a mediator that enhances the light signal reaching the sensor without complicating the overall system architecture. The light guide acts as a bridge that improves measurement precision while maintaining the simplicity of the sensing device.
Solution Approach 2:
The patent modifies the optical parameters of the system by introducing a light guide structure with specific refractive index properties. This changes the light transmission parameters, concentrating and directing light more effectively onto the sensing area. By adjusting these optical parameters through the light guide, the system achieves better signal-to-noise ratio and improved fingerprint recognition accuracy without requiring complex sensing devices.
2Measurement precision
If more light is transmitted to photosensitive units, then the measurement precision is improved, but the use of energy increases
Solution Approach 1:
The light guide structure serves as an efficient intermediary that optimizes light transmission from the light source to the photosensitive units. Rather than simply increasing the light source intensity (which would increase energy consumption), the light guide mediates the light path, concentrating and directing existing light more effectively. This intermediary approach improves measurement precision by enhancing light utilization efficiency without proportionally increasing energy input.
Solution Approach 2:
The patent changes the optical transmission parameters by introducing the light guide structure, which has specific refractive index characteristics. This parameter change optimizes the light path and concentration, allowing more light to reach the photosensitive units efficiently. The light guide modifies the optical parameters to achieve better light distribution, improving fingerprint recognition accuracy while maintaining reasonable energy consumption levels through optimized light transmission rather than brute-force light intensity increase.
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
The increased light transmission to photosensitive units improves the accuracy and sensitivity of fingerprint recognition, effectively mitigating the impact of light noise and enhancing the overall performance of fingerprint identification systems.
Implementation Method 1
The first light guide element has a refractive index n1 and the reflectors have a refractive index no, wherein n1≠n0
Implementation Method 2
light transmission structures with a first light guide element and reflectors arranged on either side, creating a light guide channel
Implementation Method 3
a plurality of photosensitive units on a side of the substrate away from the light-emitting device
Data Source
AI summary
A display device is provided. The display device includes a substrate; light-emitting devices on a side of the substrate; light transmission structures on a side of the light-emitting devices away from the substrate; and a plurality of photosensitive units on a side of the substrate away from the light-emitting device. Each of the light transmission structures includes a first light guide element and reflectors arranged along a direction parallel to a plane of the substrate. The reflectors are located at two sides of the first light guide element. An orthographical projection of the first light guide element to the substrate is located between two corresponding adjacent light-emitting devices. The first light guide element has a refractive index n1 and the reflectors have a refractive index n0, wherein n1≠n0.