OLED Display Panel Light Blocking for Fingerprint Clarity
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Solution Overview
Problem
Ambient light interference causes blurred fingerprint images in under-screen fingerprint verification methods used in OLED display devices, affecting recognition effectiveness.
Innovation Solution
An OLED display panel design featuring a light shielding layer, planarization layer, and anode layer with independently disposed sub-electrodes, including light blocking portions positioned within gaps between sub-electrodes in non-imaging areas to block ambient light, thereby reducing interference and improving fingerprint imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If under-screen fingerprint verification method is used, then security is improved, but ambient light interference causes blurred fingerprint images
Solution Approach 1:
The patent extracts and removes the harmful ambient light from the fingerprint imaging path by introducing a light blocking portion that selectively blocks ambient light while allowing imaging light to pass through, thereby eliminating the interference without removing the fingerprint verification function
Solution Approach 2:
The light blocking portion acts as an intermediary element positioned between the ambient light source and the fingerprint imaging area. It mediates the light interaction by blocking harmful ambient light while permitting necessary imaging light to reach the fingerprint sensor, thus resolving the contradiction between security and image quality
2Measurement precision
If light blocking portion is added to block ambient light, then fingerprint imaging clarity is improved, but device structure becomes more complex
Solution Approach 1:
The light blocking portion is merged with existing structural elements of the OLED display panel, specifically integrating it into the stack of layers (substrate, light shielding layer, planarization layer, anode layer, etc.). This merging approach adds the light blocking function without creating a completely separate component, thus improving image clarity while minimizing structural complexity increase
Solution Approach 2:
The light blocking portion serves multiple functions: it blocks ambient light interference, maintains structural integrity of the display panel, and works in conjunction with the imaging hole to enable fingerprint verification. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity
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 effectively blocks ambient light from entering the fingerprint imaging area, enhancing the clarity and accuracy of fingerprint recognition by minimizing light interference, thus improving the overall fingerprint imaging and recognition effect.
Implementation Method 1
The OLED display panel further comprises a light blocking portion on a side of the planarization layer away from the substrate, and an orthographic projection of the light blocking portion on the substrate falls within an orthographic projection of a gap between two sub-electrodes of the plurality of sub-electrodes on the substrate which lies in the non-imaging area
Data Source
AI summary
An OLED display panel and a display device are disclosed. The OLED display panel includes a light shielding layer, a planarization layer, and an anode layer which are arranged on a substrate in this order. The anode layer includes a plurality of sub-electrodes independently disposed. The OLED display panel includes a display area including a fingerprint imaging area and a non-imaging area. The OLED display panel further includes a light blocking portion on a side of the planarization layer away from the substrate. An orthographic projection of the light blocking portion on the substrate is within an orthographic projection of a gap between two sub-electrodes on the substrate which lies in the non-imaging area.