Backlight Module with Integrated Fingerprint Recognition
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Solution Overview
Problem
Conventional display devices using edge-lit backlight modes suffer from significant light loss, resulting in low precision fingerprint recognition when the backlight is used for optical fingerprint authentication.
Innovation Solution
A backlight module with a direct-lit mode, incorporating a first substrate with a drive circuit, light-emitting elements arranged in an array, and fingerprint recognition elements, where the light-emitting elements are electrically connected to a first drive circuit and the fingerprint recognition elements to a second drive circuit, allowing for higher luminance and uniform light distribution, enhancing fingerprint recognition precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If edge-lit mode is applied for backlight source, then device complexity is reduced, but light loss increases and fingerprint recognition precision deteriorates
Solution Approach 1:
The patent segments the backlight module into multiple independent light-emitting elements arranged in an array, with each element independently controllable by separate drive circuits. This segmentation enables direct illumination of the fingerprint sensing area without the light loss inherent in edge-lit modes, thereby improving fingerprint recognition precision while maintaining manageable device complexity through modular architecture.
2Illumination intensity
If edge-lit mode is used, then device structure is simplified, but luminance and light uniformity decrease
Solution Approach 1:
The patent merges the backlight function and fingerprint recognition function into a single integrated module. The light-emitting elements and fingerprint recognition elements share the same substrate and are controlled by integrated drive circuits, eliminating the need for separate backlight units and fingerprint sensors. This merging achieves high luminance and uniform light distribution while avoiding the complexity of multiple separate components.
3Adaptability or versatility
If fingerprint recognition elements are added separately, then fingerprint recognition function is achieved, but device area increases
Solution Approach 1:
The patent implements multi-functionality by integrating fingerprint recognition elements directly into the backlight module structure. The same substrate that supports the light-emitting elements also accommodates the fingerprint recognition elements, allowing the module to serve both backlighting and biometric authentication functions simultaneously without requiring additional device area.
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 solution improves fingerprint recognition precision by increasing luminous intensity and reducing dark regions in the backlight, allowing for higher luminance and more uniform light, which enhances the accuracy of fingerprint recognition without the need for additional space for fingerprint recognition elements.
Implementation Method 1
a plurality of light-emitting elements... The light-emitting element is electrically connected to the first drive circuit
Implementation Method 2
a plurality of fingerprint recognition elements... when an optical method is used for performing fingerprint recognition
Data Source
AI summary
Backlight module and display device are provided. The backlight module includes: a first substrate, a drive circuit on a side of the first substrate, a plurality of light-emitting elements and a plurality of fingerprint recognition elements, where the drive circuit includes a first drive circuit and a second drive circuit; the plurality of the light-emitting elements is on a side of the drive circuit away from the first substrate; the light-emitting element is electrically connected to the first drive circuit; the plurality of the light-emitting elements is arranged in an array structure; the plurality of the fingerprint recognition elements and the plurality of the light-emitting elements are on a same side of the first substrate; and the fingerprint recognition element is electrically connected to the second drive circuit.