In-Display Fingerprint Sensor Optical Compensation Layer Segmentation
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Solution Overview
Problem
In in-screen fingerprint recognition systems, the reflected light received by the fingerprint sensor requires a certain brightness, which reduces the lifespan of the pixels used for illumination, leading to energy loss and premature degradation.
Innovation Solution
A display module with an optical compensation layer and transparent material in specific areas allows light emitted during fingerprint recognition to pass directly through, avoiding energy loss and prolonging pixel life without increasing illumination brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the illumination brightness of pixels is increased to ensure sufficient light for fingerprint sensor operation, then the fingerprint recognition function is improved, but the lifespan of pixels is reduced due to accelerated energy consumption and degradation
Solution Approach 1:
The display panel is divided into a fingerprint recognition area and a non-fingerprint recognition area. The optical compensation layer is selectively removed only in the fingerprint recognition area, allowing light to pass directly to the sensor without compensation, while the non-fingerprint area retains the optical compensation layer for normal display function. This segmentation resolves the contradiction by enabling sufficient light transmission for fingerprint recognition without requiring increased overall brightness that would accelerate pixel degradation.
Solution Approach 2:
Different regions of the display panel are given different optical properties. The fingerprint recognition area has modified optical characteristics (removed compensation layer) to maximize light transmission to the sensor, while the non-fingerprint area maintains standard optical compensation for display quality. This local differentiation allows the system to achieve adequate illumination for fingerprint recognition without uniformly increasing brightness across the entire display, thereby preserving pixel lifespan.
2Loss of energy
If the optical compensation layer is removed from the fingerprint recognition area to allow more light transmission, then the light transmission efficiency is improved, but the display quality in that area may be affected
Solution Approach 1:
The optical compensation layer is segmented such that it is removed only from the fingerprint recognition area while being retained in the non-fingerprint recognition area. This selective removal ensures that light transmission efficiency is improved where needed for sensor operation, while display quality is preserved in areas where the compensation layer is maintained.
Solution Approach 2:
The display panel exhibits different optical qualities in different regions: the fingerprint recognition area has enhanced light transmission (lower quality compensation) optimized for sensor detection, while the non-fingerprint area maintains standard optical compensation for high-quality display output. This local quality differentiation resolves the contradiction between light transmission efficiency and display quality.
3Area of stationary object
If the screen frame size is reduced to achieve full-screen display using in-screen fingerprint recognition, then the screen area is increased, but the structural complexity of the display module increases
Solution Approach 1:
The fingerprint recognition function is merged with the display panel structure itself, eliminating the need for separate fingerprint sensors and larger frame spaces. The display pixels serve dual purposes: normal display function and illumination for fingerprint recognition. This merging reduces the overall device complexity despite achieving full-screen coverage.
Solution Approach 2:
The display panel is designed with multi-functionality, where the same pixel array and light emission mechanism serve both display purposes and fingerprint recognition illumination. The optical compensation layer modification enables the display structure to fulfill multiple functions without adding separate components, thereby reducing structural complexity while maximizing screen area.
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 prolongs the lifespan of pixels by reducing energy loss during light transmission, ensuring normal fingerprint sensor operation without increasing brightness, thus enhancing the overall display module performance.
Implementation Method 1
a via in an area thereof opposite to the fingerprint recognition area, wherein the via is configured to transmit light emitted by the display panel
Implementation Method 2
a transparent material is in the via, and a light transmittance of the transparent material is greater than that of the optical compensation layer
Implementation Method 3
an optical compensation layer on the light exiting side of the display panel
Implementation Method 4
a light shielding layer having imaging holes is disposed in the display panel, thereby realizing in-screen fingerprint recognition by using the pinhole imaging principle
Data Source
AI summary
The present disclosure provides a display module and a preparation method thereof, a control method and a control device, as well as a display device. The display module includes a display panel, comprising a fingerprint recognition area; an optical compensation layer on the light exiting side of the display panel, and a via in an area thereof opposite to the fingerprint recognition area; wherein the via is configured to transmit light emitted by the display panel.