Fingerprint Sensor Placement in Display Panel
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Solution Overview
Problem
In existing display devices, the fingerprint identification sensor's precision is compromised due to light emission from the display unit interfering with the fingerprint identification process, leading to reduced accuracy and increased thickness of the display panel.
Innovation Solution
The display panel design incorporates a light-sensing unit on the array substrate, positioned away from the display drive circuit, with a vertical projection between short edges of adjacent light-emitting functional layers, minimizing lateral light emission and reducing interference from the display unit's light on the fingerprint identification unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fingerprint identification sensor is directly provided in the display region, then the authority verification process is simplified, but light emitted by the display unit directly irradiates the fingerprint identification unit forming noise that reduces identification precision
Solution Approach 1:
The patent positions the light-sensing unit in the non-display region (a different spatial dimension/zone) rather than directly in the display region, while still achieving fingerprint identification functionality. This spatial repositioning allows the sensor to receive reflected light from fingerprints without being directly exposed to display unit light emission, thus reducing noise and improving identification precision while maintaining operational simplicity.
2Device complexity
If the fingerprint identification sensor is directly provided in the display region, then the device structure is simplified, but light interference increases reducing measurement accuracy
Solution Approach 1:
The patent relocates the light-sensing unit to the non-display region, utilizing a different spatial zone from the traditional display region placement. This dimensional/spatial change allows the sensor to function effectively without direct exposure to display light, reducing interference and improving measurement precision while adding only minimal structural complexity.
3Measurement precision
If the light-sensing unit is positioned to avoid light interference, then fingerprint identification precision is improved, but the display panel thickness increases
Solution Approach 1:
The patent integrates the light-sensing unit into the non-display region of the existing display panel structure, allowing it to share the same panel thickness and utilize existing structural layers. This multi-functional integration enables the sensor to operate with reduced light interference while maintaining the overall thinness of the display panel, avoiding additional thickness 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
This configuration enhances the precision of fingerprint identification by reducing light interference and allows for a thinner display panel, aligning with the trend of lighter and thinner display products while maintaining effective fingerprint detection.
Implementation Method 1
a fingerprint identification unit, which includes a light-sensing unit
Implementation Method 2
a part of the light emitted by the display unit in the display region of the display panel will directly irradiate on the fingerprint identification unit
Data Source
AI summary
Disclosed are a display panel and a display device, the display panel includes: an array substrate, which includes a base substrate and a display drive circuit on the base substrate; a display unit, which is provided on the array substrate and located on one side of the display drive circuit that is facing away from the base substrate; and a fingerprint identification unit, which includes a light-sensing unit, wherein the light-sensing unit is provided on the array substrate and located on one side of the display drive circuit that is facing away from the base substrate, and a vertical projection of the light-sensing unit on a plane including a light-emitting functional layer of the display unit is located between short edges of the light-emitting functional layers of adjacent display units.