Display Panel Light Detection Circuit Capacitance and Shielding
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Solution Overview
Problem
In embedded fingerprint sensor display panels, the presence of numerous fingerprint sensors limits the placement of ambient light sensors, resulting in inadequate light reception and inaccurate ambient light detection due to interference from display light rays.
Innovation Solution
The implementation of a display panel with light-sensing devices and light-detection circuits, including a sensing module, reading module, and resetting module, where the second light-detection circuit incorporates a first capacitor to increase load capacitance, thereby enhancing the detection accuracy of ambient light in the presence of display light rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fingerprint sensors are evenly arranged in the display region to increase sensing points, then fingerprint recognition accuracy is improved, but the position for arranging ambient light sensor is limited, resulting in reduced ambient light reception
Solution Approach 1:
The patent divides the light-sensing function into two separate types of light-sensing devices: first light-sensing devices for fingerprint recognition and second light-sensing devices for ambient light detection. This segmentation allows different sensing functions to be performed by dedicated sensors, resolving the conflict between fingerprint sensor density and ambient light sensor placement space.
Solution Approach 2:
The patent makes the display panel itself multi-functional by enabling it to perform both fingerprint sensing and ambient light detection functions. The display panel integrates multiple types of light-sensing devices that can independently perform different sensing tasks, allowing the display system to serve multiple purposes simultaneously.
2Adaptability or versatility
If ambient light sensor receives limited ambient light due to fingerprint sensor arrangement, then sensor placement flexibility is improved, but detection accuracy of ambient light deteriorates due to interference from display light rays
Solution Approach 1:
The patent segments the light detection function by using different light-sensing devices for different purposes. The second light-sensing devices are specifically designated for ambient light detection and are equipped with dedicated light-detection circuits, separating them from the fingerprint sensing function performed by first light-sensing devices.
Solution Approach 2:
The patent introduces light-shielding layers as intermediary structures between the display light sources and the second light-sensing devices. These shielding layers block or reduce the interference from display light rays, allowing the ambient light sensors to accurately detect ambient light without being overwhelmed by the display's emitted light.
3Use of energy by moving object
If ambient light sensor detects light in limited light availability environment, then energy efficiency is improved, but detection accuracy deteriorates due to interference from display light rays
Solution Approach 1:
The patent employs light-shielding layers as intermediary structures that selectively block display light rays from reaching the second light-sensing devices while allowing ambient light to pass through. This mediation enables accurate ambient light detection even in low-light conditions where the display is emitting light, without requiring additional energy input.
Solution Approach 2:
The patent extracts and removes the harmful interference component (display light rays) from the light detection environment by using light-shielding layers. This allows the ambient light sensor to detect only the desired ambient light signal, separating it from the interfering display light, thereby maintaining detection accuracy in energy-efficient operating conditions.
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 solution improves the accuracy of ambient light detection by reducing the impact of display light rays and allowing the ambient light sensor to function effectively, even in environments with limited light availability.
Implementation Method 1
The second light-detection circuit further includes a first capacitor, and the first capacitor is electrically connected to the control terminal of the sensing module in the second light-detection circuit
Implementation Method 2
light-sensing devices and light-detection circuits, including a sensing module
Data Source
AI summary
A display panel including light-sensing devices and light-detection circuits. The light-detection circuit includes a sensing module, a reading module, and a resetting module. The sensing module includes a control terminal electrically connected to the light-sensing device and the resetting module, an input terminal electrically connected to a first signal line, and an output terminal electrically connected to the reading module. Further, a first light-sensing device is electrically connected to the control terminal of the sensing module in a first light-detection circuit, and a second light-sensing device is electrically connected to the control terminal of the sensing module in a second light-detection circuit. The second light-detection circuit further includes a first capacitor, and the first capacitor is electrically connected to the control terminal of the sensing module in the second light-detection circuit.