Backlight Array Crosstalk Management for Fingerprint Accuracy
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Solution Overview
Problem
Fingerprint identification methods using light often fail to consider the crosstalk distance, leading to weak or missing fingerprint information, especially when the crosstalk distance is about 50 μm, which adversely affects identification accuracy.
Innovation Solution
A fingerprint identification method that involves acquiring the touch position on a display panel with a backlight module, lighting specific light emitting elements based on the touch position, and collecting fingerprint information using light emitted by these elements, thereby optimizing the crosstalk distance to enhance identification accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is used for fingerprint identification without considering crosstalk distance, then the identification process is simple, but the fingerprint information becomes weak or disappears leading to poor identification accuracy
Solution Approach 1:
The backlight module is divided into multiple independently controllable light emitting elements arranged in an array. By segmenting the lighting function into discrete controllable units, the system can selectively activate only the elements needed for the current fingerprint identification task, thereby managing complexity while improving measurement precision through targeted illumination that accounts for crosstalk distance.
Solution Approach 2:
Different regions of the backlight module are controlled with different lighting characteristics based on their position relative to the touch point. The system adjusts which light emitting elements are activated and their intensity levels according to local requirements, creating optimal lighting conditions for each region while considering the crosstalk distance, thus improving fingerprint identification accuracy without uniformly increasing overall system complexity.
2Reliability
If multiple light emitting elements are activated to improve fingerprint information quality, then the anti-crosstalk effect improves, but the energy consumption increases
Solution Approach 1:
The system activates only the necessary number of light emitting elements required to achieve reliable fingerprint identification considering the crosstalk distance, rather than activating all elements. By calculating the optimal number and position of elements to activate based on touch position and crosstalk characteristics, the system achieves sufficient anti-crosstalk effect while minimizing energy consumption through partial action.
Solution Approach 2:
The system dynamically adjusts the activation state and intensity parameters of light emitting elements based on real-time conditions such as touch position and required identification quality. By changing these parameters adaptively, the system optimizes the balance between achieving reliable anti-crosstalk effect and minimizing energy consumption, activating only what is necessary for each specific identification task.
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 method effectively reduces the influence of crosstalk distance on fingerprint identification, improving accuracy and reliability by lighting corresponding point light sources according to the fingerprint identification area, allowing for more reliable and accurate fingerprint recognition.
Implementation Method 1
a backlight module having a plurality of light emitting elements arranged into an array
Implementation Method 2
fingerprint information is obtained based on light which is emitted by the at least one lit light emitting element and is reflected by the object
Data Source
AI summary
The present disclosure discloses a fingerprint identification method and apparatus, an electronic device, and a computer-readable storage medium. The fingerprint identification method includes: acquiring a touch position of an object on a display panel comprising a backlight module having a plurality of light emitting elements arranged into an array, in response to the object on the display panel; lighting at least one of the plurality of light emitting elements according to the touch position; collecting fingerprint information from the display panel, wherein the fingerprint information is obtained based on light which is emitted by the at least one lit light emitting element and is reflected by the object; and performing fingerprint identification according to the fingerprint information.