Texture Recognition Device Light Source Array Pattern Design
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Solution Overview
Problem
Current fingerprint recognition technologies face inaccuracies due to scattered light when the distance between the finger and image sensor is large, leading to blurred images and inaccurate recognition, and traditional display screens with collimators are thick, hindering thin design goals, while point light sources have insufficient intensity for effective photosensing.
Innovation Solution
A texture recognition device with a light source array and image sensor array, where the light sources are arranged in a specific pattern with a length-width ratio greater than two, serving as a photosensitive light source, and a controller controls the lighting to maximize recognition contrast by optimizing the region's shape and parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collimator is used to reduce light scattering and improve image clarity, then measurement precision is improved, but device complexity and thickness increase
Solution Approach 1:
The patent extracts and removes the collimator component from the system entirely. Instead of using a collimator to control light scattering, the invention uses a light source array with specifically arranged light sources that emit light in directions suitable for texture recognition, thereby achieving image clarity without the collimator structure.
Solution Approach 2:
The patent segments the light source into multiple individual light sources arranged in a specific pattern. Each light source is positioned and oriented to emit light toward specific regions, creating a segmented illumination approach that replaces the need for a collimator while maintaining or improving image quality.
2Device complexity
If a point light source is used to simplify the device structure, then device complexity is reduced, but illumination intensity becomes insufficient for effective photosensing
Solution Approach 1:
The patent merges multiple light sources into a coordinated array system. By combining several light sources that work together in a specific arrangement, the system achieves both structural simplicity (compared to complex optical systems) and sufficient illumination intensity (through the cumulative effect of multiple sources).
Solution Approach 2:
The patent transitions from a single-point light source to a distributed array of light sources arranged in specific spatial patterns. This dimensional transformation from 0D (point) to 2D/3D arrangement allows the system to maintain simplicity while dramatically increasing effective illumination intensity and improving light distribution.
3Ease of operation
If the distance between the finger and image sensor is increased, then ease of operation is improved, but measurement precision deteriorates due to light scattering
Solution Approach 1:
The patent applies local quality by arranging light sources in specific regions with specific orientations. Each light source is positioned to illuminate specific areas of the texture, creating localized illumination zones that maintain image clarity even when the overall distance between the sensor and texture is increased, thereby improving operational flexibility.
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 enables clearer and more accurate texture image acquisition, improving recognition accuracy by reducing scattering and enhancing the intensity of the light source, thus overcoming the limitations of traditional methods.
Implementation Method 1
the plurality of image sensors are configured to receive light emitted from the light sources and reflected to the image sensors by a texture at the touch side
Implementation Method 2
the plurality of pixel units comprise at least one first group of pixel units continuously arranged in the first pattern; the light source array comprises the pixel unit array, and the plurality of light sources comprise the plurality of pixel units
Data Source
AI summary
An operation method of a texture recognition device and a texture recognition device are provided. The texture recognition device includes a light source array and an image sensor array; the light source array includes a plurality of light sources; the image sensor array includes a plurality of image sensors, which are configured to receive light emitted from the light sources and reflected to the image sensors by a texture for a texture collection; the operation method includes: in a process of the texture collection performed by the image sensor array, lighting a first group of light sources continuously arranged in a first pattern at a first moment, so that the first group of light sources continuously arranged in the first pattern serve as a photosensitive light source for the image sensor array, in which a length-width ratio of a region occupied by the first pattern is larger than two.