Black Matrix Sensor for Display Substrate Integration
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Solution Overview
Problem
Existing display devices face challenges in integrating sensors while maintaining a high aperture opening rate, as conventional black matrices primarily used for light blocking do not effectively accommodate sensing functions without compromising the display's optical performance.
Innovation Solution
A display substrate with a black matrix sensor that includes intersecting first and second extension portions forming hollow regions, incorporating functional sensors and an optical sensor structure with a semiconductor layer, allowing for light blocking and sensing functions while ensuring the aperture opening rate is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional black matrices made of resin material mixed with black pigment are used, then light blocking function is achieved, but sensor integration capability is poor and aperture opening rate is compromised
Solution Approach 1:
The patent merges the black matrix structure with sensor components by forming the black matrix on the same substrate as the sensors, with the black matrix extending into the display region to define sensor active areas. This integration allows the black matrix to serve dual purposes: light blocking and sensor formation, thereby improving sensor integration capability without compromising aperture opening rate
Solution Approach 2:
The black matrix is designed to perform multiple functions simultaneously: it blocks light in non-display regions, defines the boundaries of sensor active areas, provides electrical insulation, and serves as a structural support layer. This multi-functionality resolves the contradiction by enabling sensor integration while maintaining aperture opening rate
2Adaptability or versatility
If black matrix extends into display region to accommodate sensors, then sensor integration is improved, but light blocking performance may be compromised
Solution Approach 1:
The black matrix is designed with spatially varying properties: in non-display regions it provides complete light blocking, while in the display region it selectively blocks light only in sensor active areas while leaving display pixel areas transparent. This local differentiation maintains light blocking performance where needed while enabling sensor integration in display regions
Solution Approach 2:
The black matrix is segmented into different functional zones: a first region extending into the display region that defines sensor active areas, and a second region in the non-display region for complete light blocking. This segmentation allows the black matrix to provide localized light blocking exactly where sensors are located, preserving both sensor integration and light blocking performance
3Adaptability or versatility
If multiple sensors are integrated in display device, then functional capability is enhanced, but device complexity increases
Solution Approach 1:
Multiple functional sensors (touch sensors, fingerprint sensors, proximity sensors) are merged into a single integrated structure on the display substrate, sharing common layers including the black matrix, substrate, and electrode structures. This merging approach enables multi-functionality while reducing overall device complexity compared to separate sensor modules
Solution Approach 2:
The display device structure is designed with universal components that serve multiple sensing functions: the black matrix serves as both light blocking structure and sensor electrode, the substrate provides mechanical support for all sensors, and the electrode layers function across multiple sensor types. This universality reduces device complexity while enabling integration of multiple functional sensors
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 enhances the integration degree of display devices by effectively blocking visible light and enabling sensing functions, preventing aperture opening rate reduction and allowing for various applications such as touch detection and fingerprint recognition.
Implementation Method 1
a black matrix sensor which blocks at least visible light
Implementation Method 2
a black matrix sensor includes a first electrode, a second electrode opposite to the first electrode and a semiconductor layer between the first electrode and the second electrode
Data Source
AI summary
A display substrate, a method for manufacturing the display substrate, a fingerprint recognition device and a display device are provided. The display substrate includes a base substrate, a black matrix sensor provided on the base substrate and a plurality of functional sensors which are spaced apart from each other, the black matrix sensor blocks at least visible light and includes a plurality of first extension portions and a plurality of second extension portions, and the first extension portions intersect the second extension portions to form a plurality of hollow regions. Orthographic projections of the functional sensors on the black matrix sensor are within the region where the black matrix sensor is located.