Display Panel Pin-Hole Light Shielding for Fingerprint Recognition
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Solution Overview
Problem
Current OLED display devices face challenges in fingerprint recognition accuracy due to the reflection of imaging beams from metal or metal oxide touch layers, which interfere with the fingerprint recognition signal and reduce imaging effectiveness.
Innovation Solution
The display panel incorporates a color filter layer with a first light-shielding layer and color resists, along with a second light-shielding layer and a touch layer, where the first imaging pin-holes are larger than the second imaging pin-holes, allowing beams to be reflected by the touch layer and incident outside the second imaging pin-holes, thereby preventing interference and improving fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch layer with metal or metal oxide is integrated into the OLED display device, then the integration level of the display device is improved, but imaging beams are reflected by the touch layer and interfere with fingerprint recognition accuracy
Solution Approach 1:
The light-shielding layer is divided into multiple segments: a first light-shielding layer with first imaging pin-holes located at the color filter layer position, and a second light-shielding layer with second imaging pin-holes located at the array layer position. This segmentation allows different regions to perform different functions - the first layer handles color filtering and initial light shielding, while the second layer specifically blocks reflected light from the touch layer that would interfere with fingerprint recognition.
Solution Approach 2:
The first light-shielding layer acts as an intermediary between the touch layer and the second light-shielding layer. It blocks a portion of the imaging beams before they reach the touch layer, reducing the intensity of reflected light that would otherwise interfere with the fingerprint recognition sensor. This intermediary structure enables the touch layer to function while minimizing its harmful reflective effects.
2Measurement precision
If a light-shielding layer with imaging pin-holes is provided, then fingerprint recognition accuracy is improved, but metal layers in the touch structure reflect beams that do not carry fingerprint information
Solution Approach 1:
The first light-shielding layer is positioned to preemptively block imaging beams before they can be reflected by the touch layer's metal structures. By placing this light-shielding layer at the color filter layer position, the patent prevents the formation of harmful reflected beams that would carry no fingerprint information and would interfere with the fingerprint recognition sensor's ability to accurately detect fingerprint patterns.
Solution Approach 2:
The light-shielding layers are designed with spatially varying properties - the first light-shielding layer is positioned at the color filter layer with first imaging pin-holes, while the second light-shielding layer is positioned at the array layer with second imaging pin-holes. This local differentiation allows each layer to address specific interference sources at different depths, with the first layer handling color filtering and the second layer specifically targeting reflected light from the touch structure.
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 fingerprint recognition accuracy by shielding beams that do not carry fingerprint information, reducing interference and improving the imaging effect, while the color filter layer absorbs outside light to prevent display effects from being affected by metal layers.
Implementation Method 1
the color filter layer includes a first light-shielding layer and color resists
Implementation Method 2
a part of imaging beams may be directly reflected to the fingerprint recognition element
Implementation Method 3
beams generated by an external fingerprint recognition light source or by reusing an organic light-emitting element of the OLED display device
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a base substrate, an array layer located at one side of the base substrate, a display layer located at one side of the array layer facing away from the base substrate, a color filter layer located at one side of the display layer facing away from the array layer, a touch layer located between the color filter layer and the display layer, a second light-shielding layer located at one side of the display layer facing away from the color filter layer and a light-sensing sensor layer. The color filter layer includes a first light-shielding layer and color resists, the first light-shielding layer includes multiple first imaging pin-holes; the second light-shielding layer includes multiple second imaging pin-holes corresponding to the first imaging pin-holes. The light-sensing sensor layer is used for detecting images generated via the second imaging pin-holes.