OLED Display Panel Substrate Through Holes for Fingerprint Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED display panels have low light transmittance, leading to poor fingerprint identification performance due to light loss as it passes through multiple layers before reaching the sensing IC.
Innovation Solution
The OLED display panel incorporates through holes in the substrate within the fingerprint identifying region, allowing light emitted from the light-emitting material layer to directly reach the sensing unit, reducing path loss and enhancing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light passes through each layer of the OLED display panel, then the light reaches the sensing IC, but a part of the light is lost at each layer resulting in large light loss and poor fingerprint identification
Solution Approach 1:
The patent extracts the light transmission path from the multi-layer structure by creating through-holes that bypass intermediate layers. The through-holes remove the obstructing film layers along the light path, allowing light to travel directly from the OLED light-emitting layer to the sensing IC without passing through multiple intermediate layers that cause light loss.
Solution Approach 2:
The patent introduces a vertical dimension solution by creating through-holes that extend through the thickness of the display panel. This vertical pathway allows light to travel directly through the panel thickness rather than laterally through multiple layered structures, effectively changing the light transmission dimension from lateral layer-by-layer to vertical straight-through.
2Illumination intensity
If the OLED display panel uses a multi-layer process structure, then the display function is achieved, but the light transmittance is low when light needs to pass through to the sensing IC
Solution Approach 1:
The patent segments the light transmission path from the integrated multi-layer structure by creating discrete through-holes. These through-holes segment the light path into distinct regions: the light-emitting layer, the through-hole channel, and the sensing IC, allowing light to bypass the intermediate layers that would otherwise obstruct transmission.
Solution Approach 2:
The through-holes act as intermediary structures that facilitate light transmission between the light-emitting layer and the sensing IC. These holes serve as a mediating pathway that connects the two functional layers while excluding the intermediate film layers that would otherwise block light transmission.
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 increased transmittance through the substrate improves fingerprint identification performance by ensuring more light reaches the sensing unit, thereby enhancing the accuracy and efficiency of fingerprint unlocking.
Implementation Method 1
the light emitted from the light-emitting material layer and reflected by the fingerprint surface travels through the through hole and arrivals the sensing unit
Implementation Method 2
light reflected by a fingerprint surface
Data Source
AI summary
An organic light-emitting diode (OLED) display panel and a display device are provided. The OLED display panel includes a substrate, a driving circuit layer formed on a side of the substrate, a light-emitting material layer formed on a side of the driving circuit layer away from the substrate, a sensing unit formed on another side of the substrate away from the driving circuit layer and configured to receive light reflected by a fingerprint surface. In a fingerprint identifying region of the OLED display panel, the substrate includes a through hole, and the light emitted from the light-emitting material layer and reflected by the fingerprint surface travels through the through hole and arrivals the sensing unit.