一种具有导光板的面光源生物识别设备
By converting point light sources into uniform surface light sources through a light guide plate, and combining this with control unit and sensor feedback to adjust the brightness of the light source, the problem of uneven illumination is solved, thereby improving the recognition accuracy and reliability of biometric devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SHIYUN TECHNOLOGY CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-17
AI Technical Summary
Existing supplemental lighting systems typically use point or line light sources, resulting in uneven illumination, which may create shadows and affect the recognition accuracy of biometric devices.
A light guide plate is used to convert a point light source into a uniform surface light source, and the brightness and on/off status of the light source are adjusted by a control unit. Combined with sensor feedback, intelligent supplementary lighting is achieved.
It improves the efficiency of light utilization and the uniformity of illumination, enhances the recognition accuracy and reliability of biometric devices, and has a simple system structure that is easy to install and maintain.
Smart Images
Figure CN224519337U_ABST
Abstract
Claims
1. A face light source biometric device having a light guide plate, characterized by, include: case; A light source array unit includes at least one light source for emitting light; A light guide plate is disposed above the light source array unit and is used to uniformly guide the light emitted by the light source to the light-emitting surface. The light-emitting surface is the upper surface of the light guide plate, which is used to emit light uniformly to form a surface light source; The sensor, having the same orientation as the light source array unit, is used to receive reflected signals from the palm or face.
2. The face light source biometric device having a light guide plate according to claim 1, wherein, The light guide plate includes: Transparent substrate with high light transmittance; A light-scattering structure is disposed inside the transparent substrate to scatter and uniformly distribute light.
3. The face light source biometric device having a light guide plate according to claim 2, wherein, The astigmatic structure is one of the following: Microprism structure; grating structure; Dispersed structure of luminescent particles.
4. The face light source biometric device having a light guide plate according to claim 1, wherein, Also includes: The control unit is used to adjust the brightness and on / off status of the light source array unit.
5. The face light source biometric device having a light guide plate according to claim 4, wherein, The control unit includes: A brightness adjustment module is used to adjust the brightness of the light source based on feedback from the sensor unit. The switch control module is used to control the light source to turn on and off.
6. The face light source biometric device having a light guide plate according to claim 1, wherein, The light guide plate includes a light guide body and an electronic control board; The light guide is used to direct the light from the light source to the electronic control board; The electronic control board is located above the light source and has both transparent and frosted states. In the transparent state, the light emitted by the light source is not processed; in the frosted state, the light emitted by the light source is emitted uniformly.
7. The face light source biometric device having a light guide plate according to claim 6, wherein, The light emitted by the light source is structured light.
8. The face light source biometric device having a light guide plate according to claim 7, wherein, When the light source array unit has multiple light sources, the structured light emitted by different light sources has different shapes.
9. The face light source biometric device having a light guide plate according to claim 7, wherein, The light source includes at least a first light source, a second light source, and a third light source; the first light source, the second light source, and the third light source are each controlled by different independent switches.
10. The face light source biometric device having a light guide plate according to claim 9, wherein, The brightness of the first light source, the second light source, and the third light source are different.