Display Panel Light-Shielding Layer for Fingerprint Recognition
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Solution Overview
Problem
As display panel thickness decreases, the overlapped area between adjacent images and recognized fingerprint areas becomes too large or too small, leading to information loss and reduced accuracy in fingerprint recognition.
Innovation Solution
The display panel design includes a light-shielding layer with specific holes and a cover plate configuration, where the distance between the light-shielding layer and sensor is optimized to balance the overlapped area, allowing light from specific fingerprint areas to pass through and be incident on the sensor, reducing the overlapped area between adjacent images and increasing the recognizable fingerprint area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display panel thickness is reduced to meet the demand for thin and light products, then the portability and aesthetic appeal are improved, but the overlapped area between adjacent images becomes too large or too small, leading to information loss and reduced fingerprint recognition accuracy
Solution Approach 1:
The patent applies local quality by configuring different optical properties at different locations within the display panel. Specifically, the light-shielding layer is selectively positioned at the fingerprint recognition area to block stray light, while other areas maintain normal display functionality. This localized optimization allows the thin display panel to achieve accurate fingerprint recognition without compromising overall thickness reduction.
Solution Approach 2:
The patent introduces a light-shielding layer as an intermediary element between the fingerprint area and the sensor. This intermediate layer selectively blocks oblique incident light that would cause image overlap, while allowing perpendicular light to pass through for accurate fingerprint recognition. The light-shielding layer acts as a mediator that resolves the conflict between thin panel design and recognition accuracy.
2Device complexity
If the distance between the light-shielding layer and sensor is not optimized, then the structure is simpler, but the overlapped area between adjacent images increases, causing information loss in fingerprint recognition
Solution Approach 1:
The patent applies parameter changes by optimizing the distance between the light-shielding layer and the sensor to a specific range. This parameter optimization ensures that the overlapped area between adjacent images is controlled within an acceptable range, preventing information loss while maintaining a relatively simple structure. The specific distance parameter is tuned to achieve the best balance between structural simplicity and information preservation.
3Ease of manufacture
If the light-shielding layer is positioned closer to the sensor, then the manufacturing process is simpler, but the overlapped area between adjacent images becomes too large, reducing the recognizable fingerprint area
Solution Approach 1:
The patent optimizes the position parameter of the light-shielding layer by setting its distance from the sensor within a specific range. This parameter optimization ensures that the overlapped area between adjacent images is controlled, maximizing the recognizable fingerprint area while maintaining ease of manufacture. The optimal position balances manufacturing simplicity with effective fingerprint recognition area.
4Device complexity
If the display panel uses conventional structure without light-shielding layer, then the device complexity is lower, but adjacent image overlap causes fingerprint recognition inaccuracy
Solution Approach 1:
The patent introduces a light-shielding layer as an intermediary element that blocks oblique incident light causing image overlap. This intermediate layer is strategically positioned to prevent stray light from reaching the sensor at incorrect angles, thereby improving fingerprint recognition precision while adding minimal structural complexity. The light-shielding layer acts as a mediator that resolves the optical interference problem.
Solution Approach 2:
The light-shielding layer is selectively applied only to the fingerprint recognition area rather than the entire display panel. This localized approach improves fingerprint recognition precision by blocking stray light at the critical area, while minimizing the overall increase in device complexity. The local quality principle ensures that the light-shielding function is applied only where needed.
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 improves the accuracy of fingerprint recognition by balancing the overlapped area, ensuring that more fingerprint information is captured effectively.
Implementation Method 1
a light-shielding layer located on one side of the base substrate away from the sensor, and having a plurality of first holes which is configured to allow light from a fingerprint to pass through and be incident on the sensor
Implementation Method 2
a base film located between the connection layer and the sensor, wherein a gas gap is provided between the base film and the sensor, and a refractive index of the base film is greater than a refractive index of the gas gap
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a base substrate; a sensor; a light-shielding layer, and having a plurality of first holes configured to allow light from a fingerprint to pass through and be incident on the sensor; an encapsulation layer; a color filter layer on one side of the encapsulation layer away from the base substrate; and a cover plate on one side of the color filter layer away from the base substrate, wherein a distance between a surface of the cover plate away from the base substrate and a surface of the light-shielding layer away from the base substrate is a first distance, a distance between a surface of the light-shielding layer close to the base substrate and a surface of the sensor close to the base substrate is a second distance, 0<the second distance/the first distance≤0.63.