Display Detection Module With Light Shielding for Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
External light can deteriorate the performance of detection modules in display devices, such as fingerprint detection modules, by increasing leakage current and affecting the potential difference between electrodes, leading to reduced sensing performance and reliability.
Innovation Solution
Incorporating a light shielding layer between the substrate and the sensor driving circuit, which receives a light blocking voltage to prevent external light from entering the sensor unit, thereby reducing leakage current and maintaining the potential difference between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no light shielding layer is used, then the device structure is simpler, but external light increases leakage current and deteriorates detection module performance
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the substrate and the sensor driving circuit. This layer blocks external light from reaching the transistor, preventing light-induced leakage current while maintaining structural organization. The light shielding layer acts as a mediator that protects the detection module without requiring fundamental redesign of the existing structure.
Solution Approach 2:
The light shielding layer is applied selectively in the sensor unit where the detection module is located, rather than throughout the entire device. This localized approach provides targeted protection against external light interference while minimizing additional complexity and material usage in non-critical areas.
2Object-affected harmful factors
If light shielding layer is added, then external light blocking is improved, but manufacturing process becomes more complex
Solution Approach 1:
The light shielding layer's electrical parameter (voltage) is utilized as a control mechanism. By applying a light blocking voltage to the light shielding layer, the structure dynamically adjusts its light-blocking capability. This parameter-based control allows for effective light shielding while maintaining manufacturing simplicity, as the voltage control can be integrated into existing driving circuits without requiring complex mechanical or structural modifications.
3Reliability
If light blocking voltage is applied to light shielding layer, then transistor leakage current is reduced, but power consumption increases
Solution Approach 1:
The light blocking voltage applied to the light shielding layer can be implemented in a periodic or pulsed manner rather than continuously. The voltage is applied during detection phases when light blocking is needed and reduced or removed during non-detection phases, thereby maintaining transistor performance while minimizing continuous power consumption.
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 light shielding layer effectively blocks external light, improving the sensing performance and overall reliability of the detection module by preventing performance deterioration due to external light exposure.
Implementation Method 1
a light shielding layer to block an external light from entering the sensor driving circuit
Data Source
AI summary
A detection module for a display device includes: a substrate; a detector disposed on the substrate to detect an external signal; a sensor driving circuit disposed on the substrate to drive the detector; and a light shielding layer to block an external light from entering the sensor driving circuit and to receive a light blocking voltage.