Display Panel Pixel Segmentation for Fingerprint and Brightness Sensing
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Solution Overview
Problem
Current display products with high screen-to-body ratios face challenges in balancing real-time optical compensation for brightness uniformity with under-screen fingerprint identification, as light reflected by fingerprints interferes with light emission brightness detection, leading to poor accuracy in fingerprint identification and brightness compensation.
Innovation Solution
A display panel design featuring alternating first and second pixel regions, where the first pixel region includes a light-emitting device and a photosensitive element for brightness detection, and the second pixel region includes a light-emitting device and a photosensitive element for fingerprint identification, using distinct light rays with different polarization states to minimize interference and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pixel region uses the same light-emitting device and photosensitive element for both display and fingerprint detection, then the device structure is simple, but the light reflected by fingerprints interferes with brightness detection leading to poor accuracy
Solution Approach 1:
The pixel region is divided into two distinct types: first pixel regions containing only light-emitting devices for display, and second pixel regions containing both light-emitting devices and photosensitive elements for fingerprint detection. This segmentation separates the display function from the sensing function, allowing the photosensitive elements to detect fingerprint information without interference from display light emission, thereby improving both fingerprint identification accuracy and brightness compensation accuracy while maintaining relatively simple device structure
Solution Approach 2:
Different pixel regions are assigned different functional qualities: first pixel regions are optimized for display with high brightness and color accuracy, while second pixel regions are optimized for sensing with integrated photosensitive elements. This local differentiation allows each region to perform its specific function with high precision without compromising the other, resolving the contradiction between structural simplicity and measurement precision
2Illumination intensity
If light-emitting devices work in high-contrast and high-brightness state for long time, then the display effect is outstanding, but different degrees of aging render inconsistent decay of light emission brightness
Solution Approach 1:
Photosensitive elements in second pixel regions detect the actual light emission brightness of light-emitting devices in real-time. This detected information is fed back to a control circuit, which then adjusts the driving signals to compensate for brightness decay caused by aging. This feedback mechanism enables real-time brightness uniformity compensation, allowing the display to maintain outstanding high-contrast and high-brightness performance over long periods while correcting for aging-induced inconsistencies
Solution Approach 2:
The photosensitive elements serve multiple functions: they detect fingerprint information during touch events and simultaneously monitor the brightness of light-emitting devices for compensation purposes. This multi-functionality allows the system to maintain display brightness uniformity without adding separate sensing components, resolving the contradiction between high display performance and long-term stability
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 design enables real-time brightness compensation and improved fingerprint identification accuracy by separating the light used for fingerprint detection from the light used for brightness compensation, reducing disturbances and enhancing overall performance.
Implementation Method 1
the second light-emitting device is configured to emit a second light ray to the non-display side
Implementation Method 2
the second light ray has a second polarization direction perpendicular to the first polarization direction
Implementation Method 3
the second photosensitive element is configured to allow the second light ray to be incident therein and detect the second light ray
Implementation Method 4
the first light-emitting device is configured to emit a first light ray to the display side
Implementation Method 5
the first photosensitive element is configured to allow the first light ray reflected by an external object to be incident therein and detect the reflected first light ray
Data Source
AI summary
A display panel and an operation method thereof are disclosed. In the display panel, a second light-emitting device is configured to emit a second light ray to the non-display side, and a second photosensitive element is configured to allow the second light ray to be incident therein and detect the second light ray. A first light-emitting device and the second light-emitting device are configured to emit a first light ray to the display side, and a first photosensitive element is configured to allow the first light ray reflected by an external object to be incident therein and detect the reflected first light ray. The second light ray is of a type different from that of the first light ray.